TWM641269U - Shell Cartridge - Google Patents

Abstract

A cannonball cartridge manufactured through a plurality of steps, these steps include: providing a masterbatch, wherein the material of the masterbatch includes 7475 aluminum alloy; turning the masterbatch to form a blank; performing a first annealing and a first extension on the blank to form a first workpiece; performing a second anneal and a second extension to the first workpiece to form a second workpiece; performing a third anneal and a third extension to the second workpiece to form a third workpiece; trimming the third workpiece; The cut third workpiece is subjected to solution heat treatment to obtain the projectile cartridge. In addition, the cannonball barrel includes a barrel bottom, and a bottom hole is formed on the bottom of the barrel. The bottom hole includes a first bottom hole portion and a second bottom hole portion, and the second bottom hole portion is configured on the first bottom hole portion and the bottom hole of the barrel. and the inner diameter of the first bottom hole portion is smaller than the inner diameter of the second bottom hole portion.

Description

Shell Cartridge

The present novel creation provides a projectile cartridge, and in particular relates to a projectile cartridge having high strength and light weight.

Cannonballs are a fairly common artillery weapon in the military field. Generally speaking, when launching a cannonball, it is necessary to fill the cannonball into the barrel containing the cannonball, and generate a chain combustion and explosion reaction by igniting a primer and other devices, thereby generating enough propulsion to shoot the cannonball out of the cannon, and Has powerful destructive power.

However, most of the existing shell barrels are made of alloy steel or copper. Although they can provide higher strength to withstand the reaction force when the shell is fired, they also have the disadvantage of being heavy and heavy. For this reason, some manufacturers try to use other materials to make cartridges, but the existing materials are difficult to simultaneously have the advantages of high strength, light weight and long-term storage.

The creators exhausted their minds to study carefully, and then developed a high-strength and lightweight shell cartridge, in order to achieve the effect of improving the firing performance and ease of use of the shell.

This new creation provides a cannonball barrel, which is manufactured through a plurality of steps. These steps include: providing a masterbatch, wherein the material of the masterbatch includes 7475 aluminum alloy; turning the masterbatch to form a blank; performing the first step on the blank. an anneal and a first extension to form a first workpiece; a second anneal and a second extension to the first workpiece to form a second workpiece; a third anneal and a third extension to the second workpiece to form a third workpiece ; cutting the third workpiece; and carrying out solution heat treatment to the third workpiece after cutting to obtain to the shell cartridge. In addition, the cannonball barrel includes a barrel bottom, and a bottom hole is formed on the bottom of the barrel. The bottom hole includes a first bottom hole portion and a second bottom hole portion, and the second bottom hole portion is arranged on the first bottom hole portion and the bottom hole portion. Between the outer surfaces of the bottom of the cartridge, and the inner diameter of the first bottom hole is smaller than the inner diameter of the second bottom hole.

In one embodiment, the above steps further include: performing the first annealing on the blank to obtain a first annealed workpiece; performing the second annealing on the first workpiece to obtain a second annealed workpiece; and performing the first annealing on the second workpiece Three annealing to obtain a third annealed workpiece, wherein the grain size of the first annealed workpiece, the second annealed workpiece, and the third annealed workpiece is substantially the same as that of the masterbatch.

In one embodiment, the above steps further include: performing fourth annealing on the cut third workpiece to obtain a fourth annealed workpiece; forging the fourth annealed workpiece to obtain a fourth workpiece, wherein the fourth workpiece includes a A fourth workpiece mouth and a fourth workpiece body, and the outer diameter of the fourth workpiece mouth is smaller than the outer diameter of the fourth workpiece body; and solid solution heat treatment is performed on the fourth workpiece.

In one embodiment, the above-mentioned fourth workpiece further includes a fourth workpiece shoulder, the fourth workpiece shoulder is disposed between the fourth workpiece mouth and the fourth workpiece body, and the outer diameter of the fourth workpiece shoulder Increase gradually along the direction from the fourth workpiece mouth to the fourth workpiece body.

In one embodiment, a plurality of anchor holes are formed on the bottom of the above-mentioned cartridge, and these anchor holes are arranged at equal intervals along the circumference of the bottom hole.

In one embodiment, the cannonball barrel further includes a barrel mouth, and the wall thickness of the cannonball barrel increases gradually along the direction from the barrel mouth to the bottom of the barrel.

In one embodiment, the above-mentioned blank, first workpiece, second workpiece, third workpiece and shell cartridge respectively have a blank length, a first workpiece length, a second workpiece length, and a third workpiece length And a barrel length, and blank length, first workpiece length, second workpiece length, third workpiece Length and barrel length are 85mm, 120.30mm, 170mm, 232.50mm and 173mm respectively.

In one embodiment, the above steps further include: cutting the second workpiece from the second workpiece length to 150 mm; wherein, in the step of cutting the third workpiece, the third workpiece is cut from the third workpiece length to 178mm.

In an embodiment, the above steps further include: performing anodic treatment on the third workpiece after the solution heat treatment.

In this way, the shell barrel of this new creation is formed through multiple annealing and stretching processes, so it still maintains good ductility and toughness while reaching the predetermined size, and because the material of the shell barrel includes 7475 aluminum alloy, it has Advantages of high strength and light weight.

In order to make the above-mentioned features and advantages of the new creation more obvious and easy to understand, the following specific examples are given together with the attached drawings for detailed description as follows.

100: Cannonball Cartridge

110: Bottom of the cartridge

112: bottom hole

112a: the first bottom hole

112b: the second bottom hole

114: Anchor hole

120: Cartridge body

130: Mouth of cartridge

140: Cartridge shoulder

300: rough embryo

310: Bottom of rough embryo

320: Hair embryo body

400: the first workpiece

410: Bottom of the first workpiece

420: The body of the first workpiece

500, 500': the second workpiece

510: the bottom of the second workpiece

520, 520': the second workpiece body

600, 600': the third workpiece

610: The bottom of the third workpiece

620, 620': the body of the third workpiece

700: The fourth workpiece

710: Bottom of the fourth workpiece

712: bottom hole

720: The body of the fourth workpiece

730: The mouth of the fourth workpiece

740: Fourth workpiece shoulder

C: Cavity

O1~O12: outer diameter

I1~I8: inner diameter

L1: Length of rough embryo

L2: first workpiece length

L3: Second workpiece length

L4: second workpiece cutting length

L5: The third workpiece length

L6: The third workpiece cutting length

L7: The fourth workpiece length

L8: The bottom thickness of the fourth workpiece

L9: barrel length

L10: Thickness of the bottom of the barrel

S210~S270: steps

Fig. 1 is the three-dimensional schematic diagram of an embodiment of the shell cartridge of the present invention.

FIG. 2 is a schematic flow diagram of the steps of one embodiment of the method for manufacturing the projectile cartridge of the present invention.

Fig. 3 is a schematic longitudinal sectional view of an embodiment of a blank made of a masterbatch.

FIG. 4 is a schematic longitudinal cross-sectional view of an embodiment of the first workpiece formed after the blank of FIG. 3 is subjected to first annealing and first drawing.

FIG. 5 is a schematic longitudinal cross-sectional view of an embodiment of a second workpiece formed after the first workpiece of FIG. 4 undergoes second annealing and second stretching.

FIG. 6 is a schematic longitudinal sectional view of an embodiment of the second workpiece of FIG. 5 after cutting.

7 is a schematic longitudinal sectional view of an embodiment of a third workpiece formed after the second workpiece of FIG. 6 is subjected to a third annealing and a third stretching.

FIG. 8 is a schematic longitudinal sectional view of an embodiment of the third workpiece in FIG. 7 after cutting.

FIG. 9 is a schematic longitudinal sectional view of an embodiment of the fourth workpiece formed after the third workpiece of FIG. 8 is turned, fourth annealed, and closed.

FIG. 10 is a schematic longitudinal sectional view of an embodiment of the cannonball barrel formed after the fourth workpiece in FIG. 9 is turned, mouth processed, and solution heat treated.

The aforementioned and other technical contents, features and effects of the new creation will be clearly presented in the following detailed description of the preferred embodiments with reference to the drawings. It is worth mentioning that the directional terms mentioned in the following embodiments, such as: up, down, left, right, front or back, etc., are only directions referring to the attached drawings. Accordingly, the directional terms used are illustrative rather than limiting of the novel creation. In addition, in the following embodiments, the same or similar elements will use the same or similar symbols.

Please refer to Fig. 1 and Fig. 2, wherein Fig. 1 is a three-dimensional schematic diagram of an embodiment of the shell cartridge of the present invention, and Fig. 2 is a flow chart of an embodiment of the method for manufacturing the shell cartridge of the present invention schematic diagram. The cannonball barrel 100 of this embodiment is suitable for filling the cannonball (not shown) in the barrel, and the cannonball is shot out from the barrel of the cannonball barrel 100 after being activated by a device such as an impact primer. On the other hand, the cannonball cartridge 100 is made through a plurality of steps, and these steps include: providing a masterbatch, and the material of the masterbatch includes 7475 aluminum alloy (step S210); turning the masterbatch to form a blank (step S220 ); performing first annealing and first extension to the blank to form a first workpiece (step S230); performing second annealing and second extension to the first workpiece to form a second workpiece (step S240); The workpiece undergoes the third annealing and the Three stretching to form a third workpiece (step S250); cutting the third workpiece (step S260); and performing solution heat treatment on the cut third workpiece to obtain a shell barrel (step S270).

Please refer to FIG. 3 . FIG. 3 is a schematic vertical cross-sectional view of an embodiment of the blank made of the masterbatch. In detail, when the industry wants to manufacture the cannonball barrel 100 , it can first provide a masterbatch, and the material of the masterbatch includes 7475 aluminum alloy (AA 7475, ISO R209 AlZn5.5MgCu(A)). Preferably, the masterbatch is a block, ingot or columnar material composed entirely of 7475 aluminum alloy, and the grain size is, for example, 0.05mm, but the present invention is not limited thereto. Compared with the conventional cannonball barrels that use alloy steel or copper alloy as the main material of the barrel body, the cannonball barrel 100 made of 7475 aluminum alloy in this embodiment not only has higher strength, but also greatly reduces the weight. Assuming that there are 30 ammunition in a box of shells, by changing the material of the shell barrel 100 from alloy steel to 7475 aluminum alloy, the weight of a single ammunition can be reduced from the original 343 grams to 130 grams, which is only the original weight. 38% of the weight, so the convenience of carrying and using the shell cartridge 100 can be effectively improved, and the cylinder body of the shell cartridge 100 can also withstand greater firing chamber pressure.

After the masterbatch is obtained, the masterbatch can be molded into a blank 300 through a lathe process. The blank 300 can be regarded as a cylindrical structure that substantially forms a cavity C inside, and includes a blank bottom 310 and a blank body 320, wherein the blank body 320 is connected to the bottom 310 of the blank, and the cavity C Formed in the body part 320 of the blank. In this embodiment, the blank 300 has a blank length L1, wherein the blank length L1 is, for example, 85 millimeters; in addition, the blank bottom 310 has a first outer diameter O1, wherein the first outer diameter O1 is, for example, 43.80 millimeters ; And the blank body 320 has a second outer diameter O2 and a first inner diameter I1, wherein the second outer diameter O2 is, for example, 50.84 mm, and the first inner diameter I1 is, for example, 43.84 mm. As shown in FIG. 3 , the outer diameter at the junction of the blank bottom 310 and the blank body 320 is preferably slightly larger than the first outer diameter O1. Straight cylindrical structure with uniform diameter.

Please refer to FIG. 4 . FIG. 4 is a schematic longitudinal sectional view of an embodiment of the first workpiece formed after the first annealing and the first stretching of the blank in FIG. 3 . After the blank 300 is formed, a first annealing and a first extension can be performed on the blank 300 to form a first workpiece 400 . In detail, the turned rough blank 300 can be cleaned with an alkaline degreasing agent to remove the grease on the surface of the turning tool. Since the material itself is squeezed during the turning process, it may remain in all or part of the material body. There is residual stress, which will not only increase the hardness of the blank 300, but also reduce the toughness and ductility of the blank 300, which is not conducive to subsequent processing. Therefore, a first annealing can be performed on the cleaned blank 300 to obtain a first annealed workpiece, wherein the first annealing is, for example, complete annealing, that is, the residual stress of the blank 300 can be completely eliminated after annealing. In order to ensure that the workpiece will not have structural defects such as fracture or misalignment during subsequent processing, the size and hardness of the first annealed workpiece can be detected after the first annealing. Taking the hardness as an example, when the hardness of the first annealed workpiece drops to Rockwell When the hardness (HRH) value is 90~100, it means that the workpiece has returned to the state that can be processed again, but the new creation is not limited to this, in other possible embodiments, it can also be based on the final size of the shell barrel 100 Properly adjust the size and hardness of the first annealed workpiece.

In addition, in order to prevent unexpected changes in the grain size of the workpiece during the drawing process and thus affect the quality of the finished product, it is possible to detect whether the grain size of the first annealed workpiece is the same as that of the master batch after the first annealing. Theoretically, after the first annealing is completed, the grain size of the first annealed workpiece should be substantially the same as that of the master batch. If the grain size of the first annealed workpiece is significantly larger than that of the master batch, then the Check whether the extension stroke is too large or whether there is any abnormality in the machine used for processing.

Afterwards, pickling, film treatment and lubricating treatment can be carried out to the first annealed workpiece that has passed the inspection, wherein pickling is, for example, using RL-125C0 acidic degreasing agent to wash away the oil that cannot be washed off with alkaline degreasing agent, and film treatment is, for example, Sodium fluoride is coated on the workpiece surface, and the lubricating treatment is further coated with 234 lubricating soap, so as to complete the preparatory process before drawing. Afterwards, the first The annealed workpiece is first extended so that it becomes the first workpiece 400 as shown in Figure 4, wherein the first workpiece 400 includes a first workpiece bottom 410 and a first workpiece body 420, and the first workpiece body 420 is connected on the bottom 410 of the first workpiece. In this embodiment, the first workpiece 400 has a first workpiece length L2, wherein the first workpiece length L2 is, for example, 120.30 millimeters; in addition, the first workpiece bottom 410 has a third outer diameter O3, wherein the third outer diameter O3 For example, it is 43.80 mm; and the first workpiece body 420 has a fourth outer diameter O4 and a second inner diameter I2, wherein the fourth outer diameter O4 is, for example, 47.43 mm, and the second inner diameter I2 is, for example, 43.05 mm.

Please refer to FIG. 5 . FIG. 5 is a schematic longitudinal cross-sectional view of an embodiment of the second workpiece formed after the first workpiece in FIG. 4 is subjected to the second annealing and the second stretching. After the first extension is completed, the dimensions of the first workpiece 400 can be detected to ensure that the first workpiece 400 meets the above-mentioned dimensions before subsequent processing. On the other hand, since the residual stress generated by the first stretching remains inside the first workpiece 400 , it is preferable to detect the hardness or grain size of the first workpiece 400 together. Afterwards, use an alkaline degreasing agent to clean, and perform a second annealing on the first workpiece 400 to obtain a second annealing workpiece, wherein the second annealing is, for example, complete annealing, that is, the residual stress of the first workpiece 400 can be completely eliminated after annealing . Similarly, the industry can detect the size, hardness and grain size of the second annealed workpiece after the second annealing. When the hardness of the second annealed workpiece drops to a Rockwell hardness (HRH) value of 90-100, it means that the workpiece has recovered to The state that can be processed again.

After that, the second annealed workpiece that has passed the inspection can be pickled, coated and lubricated, and the second annealed workpiece that has completed the above-mentioned treatment can be subjected to a second extension to make it a second workpiece 500 as shown in FIG. 5 . The second workpiece 500 includes a second workpiece bottom 510 and a second workpiece body 520 , and the second workpiece body 520 is connected to the second workpiece bottom 510 . In this embodiment, the second workpiece 500 has a second workpiece length L3, wherein the second workpiece length L3 is, for example, 170 millimeters; in addition, the second workpiece bottom 510 has a fifth outer diameter O5, wherein the fifth outer diameter O5 For example, it is 43.80 mm; while the second body The portion 520 has a sixth outer diameter O6 and a third inner diameter I3, wherein the sixth outer diameter O6 is, for example, 45.52 mm, and the third inner diameter I3 is, for example, 42.71 mm.

Please refer to FIG. 6 . FIG. 6 is a schematic longitudinal sectional view of an embodiment of the second workpiece in FIG. 5 after cutting. If the subsequent drawing process is carried out with the second workpiece length L3, when the wall thickness of the second workpiece 500 is extended to a predetermined thickness, the length of the second workpiece body 520 will exceed the predetermined size, in order to reduce the machine processing time The moving stroke and the time spent in processing, preferably, the second workpiece body 520 can be cut, that is, the second workpiece 500 can be cut from the second workpiece length L3 to the second workpiece 500' in FIG. 6 The cutting length L4, wherein the second workpiece cutting length L4 is, for example, 150 mm. However, the second workpiece 500' can also be cut to different lengths according to the size of the finished product desired by the industry, and the present invention is not limited to this.

Please refer to FIG. 7 . FIG. 7 is a schematic vertical cross-sectional view of an embodiment of a third workpiece formed after the second workpiece of FIG. 6 is subjected to the third annealing and the third stretching. After cutting, the size of the second workpiece 500' can be detected to ensure that the second workpiece 500' meets the above-mentioned dimensions before subsequent processing, and preferably the hardness or hardness of the second workpiece 500' can be detected together. Grain size, and after the second workpiece 500' is cleaned by an alkaline degreasing agent, the third annealing is performed to obtain a third annealing workpiece, wherein the third annealing is, for example, complete annealing, that is, the second workpiece 500 can be completely eliminated after annealing 'The residual stress. Similarly, the industry can detect the size, hardness and grain size of the third annealed workpiece after the third annealing. When the hardness of the third annealed workpiece drops to a Rockwell hardness (HRH) value of 90-100, it means that the workpiece has recovered to The state that can be processed again.

After that, the third annealed workpiece that has passed the inspection can be pickled, coated and lubricated, and the third annealed workpiece that has completed the above treatment can be subjected to a third extension, making it a third workpiece 600 as shown in FIG. 7 , The third workpiece 600 includes a third workpiece bottom 610 and a third workpiece body 620 , and the third workpiece body 620 is connected to the third workpiece bottom 610 . In this embodiment, the third workpiece 600 There is a third workpiece length L5, wherein the third workpiece length L5 is, for example, 232.50 millimeters; in addition, the third workpiece bottom 610 has a seventh outer diameter O7, wherein the seventh outer diameter O7 is, for example, 43.80 millimeters; and the third workpiece body The portion 620 has an eighth outer diameter O8 and a fourth inner diameter I4, wherein the eighth outer diameter O8 is, for example, 43.80 mm, and the fourth inner diameter I4 is, for example, 42.48 mm. It can be found that after three annealing and stretching processes, the eighth outer diameter O8 and the seventh outer diameter O7 are substantially equal, and the outer diameter at the junction of the third workpiece bottom 610 and the third workpiece body 620 has also shrunk to The above-mentioned two outer diameters are equal, that is, the third workpiece 600 is substantially a straight cylindrical structure, but this is not limited in the present invention.

Please refer to FIG. 8 , which is a schematic longitudinal sectional view of an embodiment of the third workpiece in FIG. 7 after cutting. After the third extension, the overall outer diameter and wall thickness of the third workpiece 600 have reached the requirements for use. At this time, the third workpiece 600 can be cut to the substantially required length of the shell barrel 100 to obtain a finished product. Specifically, the third workpiece body 620 can be cut, that is, the third workpiece 600 can be cut from the third workpiece length L5 to the third workpiece cutting length L6 of the third workpiece 600' in FIG. The workpiece cut length L6 is, for example, 178 mm. However, the third workpiece 600' can also be cut to different lengths according to the size of the finished product desired by the industry, and the present invention is not limited to this.

Please refer to FIG. 9 . FIG. 9 is a schematic longitudinal sectional view of an embodiment of the fourth workpiece formed after the third workpiece of FIG. 8 is turned, fourth annealed, and closed. In detail, after the cutting is completed, the third workpiece bottom 610 can be turned to form a bottom hole 712 in FIG. Five inner diameters I5, wherein the fifth inner diameter I5 is, for example, 10.92 mm. At this moment, the length, outer diameter, inner diameter, wall thickness and the inner diameter of the bottom hole 712 of the third workpiece 600' have all reached the specifications required by the finished product, so after completing appropriate heat treatment (such as the solid solution described above), After heat treatment) and anodizing, it can be used as a straight shell shell, and it has lighter weight and higher strength than the previous straight shell shell.

If it is desired to obtain a cannonball cartridge with better performance, after the above-mentioned turning process is completed, the size of the third workpiece 600' can be detected to ensure that the third workpiece 600' meets the above-mentioned various dimensions before the subsequent further processing process, and Preferably, the hardness and grain size of the third workpiece 600' can be detected together, and the fourth annealing is performed on the third workpiece 600' after cleaning with an alkaline degreasing agent to obtain a fourth annealed workpiece, wherein the fourth annealing is, for example, It is semi-annealing, that is, the grain size will not return to the size after the first annealing to the third annealing, and only eliminates part of the residual stress caused by the third extension and turning. This method is beneficial in In the subsequent forging process, the hardness required for workpiece processing is maintained.

Afterwards, the fourth annealed workpiece can be forged and closed simultaneously to obtain a fourth workpiece 700 as shown in Figure 9, wherein the fourth workpiece 700 includes a fourth workpiece bottom 710, a fourth workpiece body 720 and a Four workpiece mouths 730 , the fourth workpiece body 720 is connected between the fourth workpiece bottom 710 and the fourth workpiece mouth 730 , and the outer diameter of the fourth workpiece mouth 730 is smaller than the outer diameter of the fourth workpiece body 720 . Specifically, the fourth workpiece 700 has a fourth workpiece length L7, wherein the fourth workpiece length L7 is, for example, 173 millimeters; the fourth workpiece bottom 710 has a fourth workpiece bottom thickness L8 and a ninth outer diameter O9, wherein the fourth workpiece bottom 710 has a fourth workpiece bottom thickness L8 and a ninth outer diameter O9, wherein The bottom thickness L8 of the four workpieces is, for example, 14.80 millimeters, and the ninth outer diameter O9 is, for example, 43.92 millimeters; in addition, the fourth workpiece body 720 maintains an outer diameter close to the fourth workpiece bottom 710 and extends straight; and the fourth workpiece mouth 730 It has a tenth outer diameter O10 and a sixth inner diameter I6, wherein the tenth outer diameter O10 is, for example, 31.30 mm, and the sixth inner diameter I6 is, for example, 29.60 mm.

Preferably, the fourth workpiece 700 also includes a fourth workpiece shoulder 740, wherein the fourth workpiece shoulder 740 is disposed between the fourth workpiece mouth 730 and the fourth workpiece body 720, as the fourth workpiece mouth 730 In the transition area with the fourth workpiece body 720 , the outer diameter of the fourth workpiece shoulder 740 gradually increases along the direction from the fourth workpiece mouth 730 to the fourth workpiece body 720 . Specifically, as shown in FIG. 9 , the outer diameters of the fourth workpiece body 720 and the fourth workpiece mouth 730 are kept constant, for example, while the fourth workpiece shoulder 740 is shaped like Become an inclined plane connecting two different outer diameters. Through such a configuration, the fourth workpiece shoulder 740 can increase the binding force between the projectile and the barrel to more than 8007 Newtons, thereby effectively improving the destructive force of the projectile during shooting.

Please refer to FIG. 10 . FIG. 10 is a schematic longitudinal sectional view of an embodiment of the cannonball barrel formed after the fourth workpiece in FIG. 9 is turned, mouth processed, and solution heat treated. In order to obtain the cannonball barrel 100 with better performance, the fourth workpiece 700 can be further processed to obtain the cannonball barrel 100 as shown in FIGS. 1 and 10 , wherein the cannonball barrel 100 includes a barrel bottom 110 , a cartridge body 120, a cartridge mouth 130 and a cartridge shoulder 140, wherein the cartridge body 120 extends upwards from the cartridge bottom 110, and the cartridge shoulder 140 is connected to the cartridge body 120 and the cartridge mouth Between the parts 130 , and the outer diameter of the barrel mouth 130 is smaller than the outer diameter of the barrel body 120 .

When the past shells are fired, the primer and the acidic corrosive gas generated when the gunpowder in the shell burns are easy to flow back through the bottom hole, resulting in damage to the firing pin that fires the primer due to ablation. Therefore, the bottom hole 712 originally formed on the bottom 610 of the third workpiece can be further processed by turning to form the bottom hole 112 as shown in FIG. 10 . In detail, the bottom hole 112 can form a first bottom hole portion 112a and a second bottom hole portion 112b after being machined, wherein the second bottom hole portion 112b is disposed between the first bottom hole portions 112a, and the first bottom hole portion 112b The hole portion 112a communicates with the cavity C of the shell barrel 100, the second bottom hole portion 112b has a seventh inner diameter I7, wherein the seventh inner diameter I7 is, for example, 13.04 mm, and the inner diameter of the first bottom hole portion 112a is the same as The fifth inner diameter I5 of the bottom holes 712 is substantially the same. In other words, the inner diameter of the first bottom hole portion 112a is smaller than the inner diameter of the second bottom hole portion 112b, and a difference is formed between the first bottom hole portion 112a and the second bottom hole portion 112b. Through such a configuration, when the primer is arranged in the bottom hole 112, the primer cap and the fire tube can be locked in the second bottom hole 112b, thereby greatly reducing the backflow of acidic corrosive gas from the first bottom hole 112a, And prolong the service life of the firing pin.

In addition, as shown in FIGS. 1 and 10 , the bottom 110 of the cartridge can be further processed to form a plurality of anchor holes 114 on the bottom 110 of the cartridge. These anchor holes 114 are adjacent to the bottom hole 112 and along the bottom hole. 112 are arranged at equal intervals in the circumferential direction. Through this design, when the striker hits the primer embedded in the bottom hole 112, the anchor hole 114 on the bottom 110 of the barrel can be fixed through the fixing device, thereby preventing the shell barrel 100 from rotating or deflecting to cause shooting interruption . It is worth mentioning that, in this embodiment, the number of anchor holes 114 is, for example, four, but this new creation is not limited thereto, and it can also be two, three or even more according to actual shooting requirements One, as long as the effect of holding the shell cartridge 100 can be reached.

On the other hand, the shell barrel 100 has a barrel length L9, wherein the barrel length L9 is, for example, 173 millimeters, which is substantially equal to the fourth workpiece length L7; the barrel bottom 110 has a barrel bottom thickness L10 and an eleventh. The outer diameter O11, wherein the thickness L10 of the bottom of the barrel is, for example, 14.80 mm, which is substantially equal to the thickness L8 of the fourth workpiece bottom; and the eleventh outer diameter O11 is, for example, 43.92 mm, which is substantially equal to the ninth outer diameter O9; in addition, the barrel mouth The portion 130 has a twelfth outer diameter O12 and an eighth inner diameter I8, wherein the twelfth outer diameter O12 is, for example, 31.30 millimeters, which is substantially equal to the tenth outer diameter O10; and the eighth inner diameter I8 is, for example, 29.60 millimeters, It is substantially equal to the sixth inner diameter I6.

After the processing of the bottom hole 112 and the anchor point hole 114 is completed, the fourth workpiece 700 can be subjected to solution heat treatment. In this embodiment, the solution heat treatment is T4+T79 solution and overaging heat treatment, so that the grains of the material processed many times return to a relatively stable state, thereby obtaining the shell 100 with better mechanical properties. Thereby, after completing the solution heat treatment, the Rockwell hardness (HRBW) values of the shell bottom 110, the barrel body 120, the barrel shoulder 140 and the barrel mouth 130 range from 87 to 87. 89, 85~88, 78~85, and 74~78, that is, the shell barrel 100 has a decreasing hardness from the bottom to the mouth. It is worth mentioning that if, as mentioned above, heat treatment is performed directly after the bottom hole 712 of the third workpiece 600' is processed to obtain a straight shell barrel, the third workpiece bottom 610 and the third workpiece body The range of Rockwell hardness values of the portion 620' can refer to the range of Rockwell hardness values of the barrel bottom 110 and the barrel body 120.

Preferably, the wall thickness of the cannonball barrel 100 is designed to gradually increase along the direction from the barrel mouth 130 to the barrel bottom 110 . Through this configuration, during the process from filling the shells to firing, the thick-walled part closer to the explosion position can withstand a greater impact, while the thin-walled part farther from the explosion position can properly reduce the impact of the shell. The weight of barrel 100 is beneficial to the carrying and use of shell barrel 100.

In addition, after the above-mentioned solution heat treatment is completed, the cannonball barrel 100 can be further anodized, such as plating with a metal with low activity, so as to prevent the outer wall of the barrel from being oxidized and corroded due to the moisture in the external environment, or Contact of the inner wall of the barrel with the powder of the shell produced unexpected deterioration.

The present invention has been disclosed above with preferred embodiments, but those skilled in the art should understand that the above embodiments are only used to describe the present invention, and should not be interpreted as limiting the scope of the present invention. And it should be noted that all changes and replacements equivalent to those of the above-mentioned embodiments should be deemed to be included in the scope of the present invention. Therefore, the scope of protection of this new creation should be defined by the scope of the patent application.

100: Cannonball Cartridge

112: bottom hole

114: Anchor hole

Claims (9)

A shell cartridge is manufactured through a plurality of steps, and the plurality of steps include: providing a masterbatch, wherein the material of the masterbatch includes 7475 aluminum alloy; turning the masterbatch to form a blank; performing a first anneal and a first extension to form a first workpiece; performing a second anneal and a second extension to the first workpiece to form a second workpiece; performing a third anneal and a third extension to the second workpiece to form A third workpiece; cutting the third workpiece; and performing solution heat treatment on the cut third workpiece to obtain the shell barrel; wherein, the shell barrel includes a barrel bottom, and the bottom of the barrel A bottom hole is formed, the bottom hole includes a first bottom hole portion and a second bottom hole portion, the second bottom hole portion is arranged between the first bottom hole portion and the outer surface of the bottom of the barrel, and the bottom hole portion The inner diameter of the first bottomed hole portion is smaller than the inner diameter of the second bottomed hole portion. The cannonball cartridge as claimed in claim 1, wherein the multiple steps further include: performing the first annealing on the blank to obtain a first annealed workpiece; performing the second annealing on the first workpiece to obtain a first annealing 2. anneal the workpiece; and performing the third anneal on the second workpiece to obtain a third anneal workpiece, wherein the grain size of the first anneal workpiece, the second anneal workpiece and the third anneal workpiece is substantially the same as the grain size of the masterbatch . The cannonball cartridge as claimed in claim 1, wherein the multiple steps further include: performing fourth annealing on the cut third workpiece to obtain a fourth annealed workpiece; forging the fourth annealed workpiece to obtain a first Four workpieces, wherein the fourth workpiece includes a fourth workpiece mouth and a fourth workpiece body, and the outer diameter of the fourth workpiece mouth is smaller than the outer diameter of the fourth workpiece body; and the fourth workpiece This solution heat treatment is performed. The shell cartridge according to claim 3, wherein the fourth workpiece further includes a fourth workpiece shoulder, the fourth workpiece shoulder is disposed between the mouth of the fourth workpiece and the body of the fourth workpiece, and The outer diameter of the fourth workpiece shoulder gradually increases along the direction from the fourth workpiece mouth to the fourth workpiece body. The cannonball barrel according to claim 1, wherein a plurality of anchor holes are formed on the bottom of the barrel, and the plurality of anchor holes are arranged at equal intervals along the circumference of the bottom hole. The cannonball barrel according to claim 1 further includes a barrel mouth, and the wall thickness of the cannonball barrel increases gradually along the direction from the barrel mouth to the bottom of the barrel. The shell barrel as claimed in claim 1, wherein the blank, the first workpiece, the second workpiece, the third workpiece and the shell barrel respectively have a blank length, a first workpiece length, a first Two workpiece lengths, a third workpiece length and a barrel length, and the blank length, the first workpiece length, the second workpiece length, the third The workpiece length and the barrel length were 85 mm, 120.30 mm, 170 mm, 232.50 mm, and 173 mm, respectively. The cannonball cartridge according to claim 7, wherein the plurality of steps further comprises: cutting the second workpiece from the length of the second workpiece to 150 mm; wherein, in the step of cutting the third workpiece, the A third workpiece is trimmed to 178 millimeters from the third workpiece length. The cannonball barrel according to claim 1, wherein the multiple steps further include: performing anodic treatment on the cannonball barrel after the solution heat treatment.

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