TWM460733U - Assembled milling cutter - Google Patents

Abstract

The utility model discloses a combined type milling cutter. The combined type milling cutter comprises a cutter handle, a connecting block, a cutting edge and a shaft pin, wherein the lower end face of the cutter handle is provided with a conical hole, the upper end face of the cutter handle is provided with a punched hole communicated with the conical hole, the connecting block is axially and movably arranged in the punched hole, the upper end face of the connecting block is provided with a bolt hole, and the lower end face of the connecting block is provided with a caulking groove penetrating through two opposite side faces; the width of a port of the caulking groove is less than that of a groove bottom, the cutting edge can be used for milling workpieces, and the upper end face of the cutting edge is convexly provided with an embedding section for embedding into the conical hole; the circumference surface of the embedding section is arranged to be a conical surface shape corresponding to the conical hole, the upper end face of the embedding section is provided with an embedding block, the shape of the embedding block corresponds to that of the embedding section, the embedding block is separably embedded in the caulking groove, and the shaft pin is provided with a shaft rod and a head part which is arranged at the upper end of the shaft rod and has large outer diameter; and the shaft rod penetrates through the punched hole and the conical hole, the lower end part of the circumference surface is provided with a thread part which can be spirally arranged in the bolt hole of the connecting block, and the thread of the thread part is a right hand thread. Therefore, the combined type milling cutter provided by the utility model has the effects that the cost is reduced and the bonding strength is good.

Description

Combined milling cutter

This creation is about a technical field of combined milling cutters, especially a combined cutter that has the effect of reducing cost and bonding strength.

Referring to the first figure, it is pointed out that the early milling cutter structure is mainly formed by directly forming a plurality of spiral grooves directly on the front end of a round bar-shaped tungsten steel bar to form a tool holder segment 10 for clamping and fixing by the machine tool. It is used to cut one of the blade segments 11 of the workpiece. However, in the milling process, only the blade segment 11 will mill the workpiece, so that only the blade segment 11 is made of a tungsten steel material having a high hardness for improving the milling effect. The shank section 10 for holding and fixing the machine tool does not require the use of the tungsten steel of high hardness and high cost. Therefore, the tungsten steel material of the shank section 10 is wasteful, and the cost of the milling cutter is high, and the relative price is also very high.

Referring to the second figure, in order to improve the problems caused by the above-mentioned milling cutter structure, a milling cutter structure with a mixed material is developed, which is mainly made of a common steel and has a shank section 12 and a Blade The milling cutter of the segment 13 is the main body, and then a hardened layer 14 of tungsten steel or other hard material is formed on the surface of the blade segment 13 by surface hardening. Thus, the material cost of the large-volume body made of the ordinary steel can be greatly reduced, and the blade segment 13 can be made sufficiently rigid by the hardened layer. However, it is very troublesome to perform surface hardening heat treatment on the surface of the blade section 13 at one end of a common steel, and the cost is also very high, so the overall manufacturing cost is still very high.

Please refer to the third figure. In order to improve the shortcomings of the above two types of milling cutters, in recent years, some manufacturers have developed and designed a combined milling cutter, which mainly includes a shank 15 and tungsten made of ordinary steel. One of the blades made of steel. A screw hole 17 is defined in the lower end surface of the shank 15 , and a stud 18 is protruded from the upper end surface of the blade 16 for screwing into the screw hole 17 of the shank 15 . In this way, the material cost of the shank 15 made of the ordinary steel can be greatly reduced, and the cutting edge 16 can be made of tungsten steel to have a good milling effect. However, since the hardness difference between the shank 15 and the blade 16 is large, and the threaded hole 17 is not large with the thread on the stud 16, the screw in the screw hole 17 is easy to be used on the stud 18 when in use. The pressure of the screw causes the condition of the disintegration, which in turn seriously affects the bonding strength.

In view of this, the creator is developing and designing the creation based on the above-mentioned problems and in-depth conceiving, and actively researching and improving the trial.

The main purpose of this creation is to provide a combined cutter with reduced cost and good bonding strength.

Specifically, the combined milling cutter of the present invention includes a shank, a connecting block, a cutting edge and a shaft bolt. Wherein, the lower end of the shank has a tapered hole, and the upper end surface has a perforation communicating with the tapered hole. The connecting block is axially movably disposed in the through hole, and the upper end surface has a screw hole, and the lower end surface has a through groove penetrating to the opposite sides, and the slot width of the insert groove is smaller than the groove bottom. The blade is available for milling the workpiece, and an upper end surface is convexly provided with an engaging portion for being inserted into the tapered hole. The circumferential surface of the engaging portion is formed in a tapered shape corresponding to the tapered hole, and the upper end surface of the engaging portion has a corresponding shape and is detachably embedded in one of the insert grooves. The axle pin has a shaft and a head having a larger outer diameter at the upper end of the shaft. The shaft is disposed in the through hole and the tapered hole, and a lower end portion of the circumferential surface has a threaded portion for screwing into the screw hole of the connecting block, and the thread on the thread portion is a right-handed thread.

Thus, by the detachable design of the blade, the blade can be made of a material having a high hardness such as tungsten steel, etc., so as to have a good milling effect, and the shank, the connecting block and the shaft bolt, etc. The components can be made from ordinary steel with lower cost to achieve a significant cost reduction. In particular, the structure in which the insert of the blade is embedded in the groove can be such that the thickness of the two sides of the insert and the groove of the joint block is large, so that the hardness difference between the blade and the joint block is large. , it will still not crack Health. Moreover, since the connecting block and the shaft bolt can be made of the same material, the thread on the threaded portion and the screw hole does not collapse due to excessive hardness difference, so the system is It can have a better bonding strength.

In the present creation, the combined milling cutter may further comprise a retracting element. Wherein, the end surface of the shank has a retracting thread segment, and the thread on the retracting thread segment is a left-hand thread. The upper end surface of the head of the axle pin has a polygonal groove for a rotary tool to be inserted to drive its rotation. The plurality of plane masks of the retracting element are held by a gripping tool. The lower end of the retracting element has a retracting screw hole for the retracting threaded portion, and the upper end surface has a through hole extending through the retracting screw hole, the through hole being permeable to the rotating tool.

Since the milling cutter of the present invention is in the milling process, the connecting block and the engaging portion of the cutting edge and the tapered hole form a self-locking tight state. Therefore, when the tool is retracted, the retracting element is only screwed on the shank, and then the rotating tool is used to rotate the shaft bolt out of the screw hole counterclockwise through the through hole, so that the head of the shaft bolt is turned out. The department is pressing the retracting element. At this time, the rotation of the retracting element is counterclockwise by the friction force, or the retracting element is directly rotated counterclockwise by the clamping tool. The retracting element can be screwed in the direction of the cutting edge on the shank, thereby pushing the head of the shaft bolt, and the lower end of the shaft bolt opens the connecting block and the opening of the cutting edge toward the tapered hole. The direction is pushed out to release the self-locking tight state, so that the blade can be easily rotated to interlock the connecting block from the axle bolt, thereby achieving the tool change purpose.

[Prior technology]

10‧‧‧Knife

11‧‧‧ cutting edge

12‧‧‧Knife

13‧‧‧ cutting edge

14‧‧‧ hardened layer

15‧‧‧Knife

16‧‧‧blade

17‧‧‧ screw holes

18‧‧‧ Stud

[This creation]

20‧‧‧Knife

21‧‧‧Conical hole

22‧‧‧Perforation

220‧‧‧through hole

23‧‧‧Retraction thread segment

30‧‧‧Connection block

31‧‧‧ screw holes

32‧‧‧Inlay

40‧‧‧ Blade

41‧‧‧Spiral groove

42‧‧‧ cutting edge

43‧‧‧Inlay section

44‧‧‧Block

50‧‧‧ shaft bolt

51‧‧‧ shaft

52‧‧‧ head

53‧‧‧ Straight section

54‧‧‧screw segment

55‧‧‧Threaded Department

56‧‧‧Polygon slot

60‧‧‧shims

70‧‧‧Retraction element

71‧‧‧ plane

72‧‧‧Retracting screw hole

73‧‧‧through hole

80‧‧‧Rotating tools

90‧‧‧Processed parts

20a‧‧‧Cutter

The first figure is a schematic cross-sectional view of a conventional integrated milling cutter.

The second figure is a schematic cross-sectional view of another conventional integrated milling cutter.

The third figure is a schematic cross-sectional view of a conventional combined milling cutter.

The fourth figure is a perspective exploded view of the first embodiment of the creation.

The fifth figure is a planar exploded view of the first embodiment of the creation.

The sixth figure is a three-dimensional combination diagram of the first embodiment of the creation.

The seventh figure is a schematic cross-sectional view of the first embodiment of the creation.

The eighth figure is a schematic view showing the assembly of the retracting element of the first embodiment of the creation.

The ninth drawing is a schematic sectional view of the retracting element of the first embodiment of the present invention.

The tenth figure is a schematic view of the retracting action of the first embodiment of the creation.

The eleventh figure is the second embodiment of the creation.

The twelfth figure is the third embodiment of the creation.

Figure 13 is a perspective exploded view of the fourth embodiment of the present invention.

Figure 14 is a schematic cross-sectional view showing the fourth embodiment of the present invention.

Please refer to the fourth to seventh figures, which is a first embodiment of the combined milling cutter according to the present invention, wherein the combined milling cutter comprises a shank 20, a connecting block 30, a cutting edge 40, and an axis. The plug 50 and a spacer 60. The lower end of the shank 20 has a tapered hole 21, and the upper end surface has a through hole 22. The lower end of the through hole 22 has a through hole 220 for communicating with the tapered hole 21. The tapered hole 21 has a taper of about 1.5. The through hole 220 has a tapered shape extending from the upper end of the tapered hole 21 (that is, the taper is also about 1.5 degrees).

The connecting block 30 is axially movably disposed in the through hole 220, and has a tapered surface on a circumferential surface thereof, and the tapered surface has a taper of about 1.5 degrees. The upper end of the connecting block 30 has a screw hole 31, and the lower end surface has a recess 32 extending through the opposite sides. The recess 32 is a dovetail groove having a notch width smaller than the bottom of the groove. In addition, the recess 32 may be other shapes such as a T-shaped groove.

The peripheral surface of the blade 40 has a plurality of spiral grooves 41 extending upward from the lower end, and a plurality of cutting edges 42 for milling the workpiece are formed between the plurality of spiral grooves 41. The upper end surface of the cutting edge 40 is convexly provided with an engaging portion 43 for inserting into the tapered hole 21, and the circumferential surface of the engaging portion 43 is tapered, and the tapered surface has a taper of about 1.5 degrees. The upper end surface of the engaging portion 43 has a correspondingly detachably embedded one of the inserts 44 in the recess 32.

The shaft pin 50 has a shaft 51 and a head 52 having a larger outer diameter at the upper end of the shaft 51. The shaft 51 has a straight rod section 53 extending from the bottom surface of the head portion 52 and a screw section 54 extending from the lower end of the straight rod section 53. The lower end portion of the circumferential surface of the screw segment 54 has a threaded portion 55 for screwing into the screw hole 31 of the connecting block 30. The thread on the threaded portion 55 is a right-handed thread. The upper end mask of the head 52 A polygonal groove 56 (e.g., a hexagonal groove, etc.) is insertable for a rotary tool 80 (e.g., a hex wrench, etc.) for driving the pivot 50 to rotate.

The spacer 60 is formed in a ring shape and is sleeved on the shaft 51 of the shaft pin 50 and sandwiched between the head 52 and the upper end surface of the holder 20.

Since the blade 40 of the present invention is designed to be separable, the blade 40 can be made of a material having a high hardness such as tungsten steel, etc., so as to have a good milling effect, and the shank 20 The connecting block 30 and the shaft bolt 50 and the like can be manufactured from a lower-cost ordinary steel material, thereby achieving a significant cost reduction. In particular, the insert 44 of the blade 40 is embedded in the slot 32 of the connecting block 30 for assembly purposes, because the two sides of the insert 44 and the recess 32 of the connecting block 30 have a larger The thickness is such that, even during the milling process, even if the hardness difference between the blade 40 and the connecting block 30 is large, there is no cracking. Moreover, since the connecting block 30 and the pivot pin 50 can be made of the same material, the thread on the threaded portion 55 and the screw hole 31 does not collapse due to excessive hardness difference due to different materials. In the bad case, the milling cutter of the present invention has a better bonding strength.

Referring to the eighth to tenth drawings, it is pointed out that the combined milling cutter of the present invention further includes a retracting element 70. Wherein: the end surface of the shank 20 has a retracting thread segment 23, and the thread on the retracting thread segment 23 is a left-hand thread.

The peripheral mask plane 71 of the retracting element 70 is available for a clip A tool (not shown) is clamped for rotation, for example, the retracting element 70 may be a quadrangular cylinder, a hexagonal cylinder, or the like. The lower end surface of the retracting element 70 has a retracting screw hole 72 for the retracting threaded portion 23, and the upper end surface has a through hole 73 extending through the retracting screw hole 72. The diameter of the through hole 73 is smaller than the axis. The outer diameter of the head portion 52 of the pin 50 is provided and is traversable by the rotary tool 80.

In the seventh figure, it is pointed out that when the combined milling cutter of the present invention rotates clockwise for milling, the blade 40 receives a counterclockwise reaction force from the workpiece 90, and the blade 40 passes the insert 44. This counterclockwise reaction force is transmitted to the connecting block 30 in a fitting relationship with the fitting groove 32. The connecting block 30 under the counterclockwise reaction force is pulled inwardly into the tapered hole 21 due to the screwing relationship between the screw hole 31 and the right-handed threaded portion 55 of the pivot pin 50, so that the connecting block The tapered circumferential surface of the engaging portion 43 of the blade 40 and the hole wall of the tapered hole 21 are pressed against each other to form a self-locking fit state.

In the tenth figure, it is pointed out that when the knife is to be retracted, the retracting screw hole 72 of the retracting element 70 is first screwed on the retracting thread section 23 of the shank 20. Then, the rotating tool 80 is inserted into the polygonal groove 56 at the upper end of the shaft pin 50 through the through hole 73 and rotated counterclockwise, so that the threaded portion 55 of the shaft bolt 50 is screwed out from the screw hole 31. Until the top surface of the head 52 of the shaft pin 50 is pressed against the bottom surface of the retracting screw hole 72. At this time, the pivot pin 50 is further rotated counterclockwise to drive the retracting member 70 by frictional force. Rotate counterclockwise or directly clamp the retracting element 70 counterclockwise by means of the gripping tool (not shown). Then, the retracting element 70 is screwed in the direction of the blade 40 on the shank 20 due to the screwing relationship between the retracting thread segment 23 of the left-hand thread and the retracting screw hole 72. Thus, the retracting element 70 pushes the head 52 of the shaft pin 50 such that the lower end of the shaft pin 50 pushes the connecting block 30 and the blade 40 toward the opening of the tapered hole 21, thereby releasing the same. Self-locking state. At this time, the blade 40 can be easily rotated to interlock the connecting block 30 from the shaft bolt 50, thereby achieving the purpose of tool change.

Referring to FIG. 11 , it is a second embodiment of the present invention, and the structure thereof is substantially the same as that of the first embodiment, with the difference that the connecting block 30 of the second embodiment has a cylindrical shape and is external thereto. The diameter is smaller than the upper end of the tapered engagement section 43 of the blade 40.

Referring to FIG. 12, it is a third embodiment of the present invention, and the structure thereof is substantially the same as that of the first embodiment. The difference is that the through hole 220 of the third embodiment has a cylindrical shape, and the connecting block 30 is The through hole 220 is cylindrical in shape and can move axially in the through hole 220.

Please refer to the thirteenth and fourteenth drawings, which is a fourth embodiment of the present invention, wherein the shank 20 is also a shape of a shank of a conventional automatic processing machine, that is, a connecting block of the present invention. 30, the blade 40, the shaft bolt 50 can also be directly applied to the handle of the conventional automatic processing machine, wherein the hole 22 of the shank 20 has a larger aperture than the through hole 220, so that the shaft pin 50 can be accommodated. The head 52 has an upper end of the perforation 22 for screwing a knife bar 20a. The The through hole 220 is cylindrical and allows the shaft 51 of the shaft bolt 50 to pass therethrough.

In summary, since this creation has the above advantages and practical value, and there is no similar product publication in similar products, it has already met the application requirements of the new patent, and is filed according to law.

20‧‧‧Knife

21‧‧‧Conical hole

22‧‧‧Perforation

220‧‧‧through hole

23‧‧‧Retraction thread segment

30‧‧‧Connection block

31‧‧‧ screw holes

32‧‧‧Inlay

40‧‧‧ Blade

41‧‧‧Spiral groove

42‧‧‧ cutting edge

43‧‧‧Inlay section

44‧‧‧Block

50‧‧‧ shaft bolt

51‧‧‧ shaft

52‧‧‧ head

53‧‧‧ Straight section

54‧‧‧screw segment

55‧‧‧Threaded Department

56‧‧‧Polygon slot

60‧‧‧shims

Claims (11)

A combined milling cutter comprising: a shank having a tapered hole in a lower end surface, the upper end surface having a through hole communicating with the tapered hole; and a connecting block axially movably disposed in the through hole, the connection The upper end of the block has a screw hole, and the lower end surface has a slot extending through the opposite sides, the slot width of the slot is smaller than the bottom of the slot; a blade is available for milling the workpiece, and the upper end surface is convex An engaging portion is disposed to be embedded in the tapered hole, and a circumferential surface of the engaging portion is formed in a tapered shape corresponding to the tapered hole, and an upper end surface of the engaging portion has a shape corresponding to the detachable portion Inserting one of the inserts; and a shaft bolt having a shaft and a head having a larger outer diameter at the upper end of the shaft, the shaft being threaded through the through hole and the tapered hole The lower end portion of the circumferential surface has a threaded portion for screwing into the screw hole of the connecting block, and the thread on the thread portion is a right-handed thread. The combined milling cutter according to claim 1, further comprising a retracting component, wherein the circumferential end of the shank has a retracting thread segment, and the thread on the retracting thread segment is a left-hand thread. The upper end surface of the head of the shaft bolt has a polygonal groove for a rotating tool to be inserted to drive the rotation thereof. The lower end of the retracting element has a retracting screw hole for the retracting thread segment and the upper end surface has a pass. The hole penetrates into the retracting screw hole, and the through hole is allowed to pass through the rotating tool. The combined milling cutter according to claim 2, further comprising a gasket. The gasket is sleeved on the shaft of the shaft bolt and is clamped between the head of the shaft bolt and the shank. The combination milling cutter of claim 1 or 2 or 3, wherein the lower end of the perforation has a through hole for communicating with the tapered hole, the through hole being tapered from the upper end of the tapered hole And can accommodate the connecting block to move axially therein. The combined milling cutter according to claim 4, wherein the peripheral surface of the connecting block is formed in a tapered shape corresponding to the through hole. The combined milling cutter of claim 4, wherein the connecting block has a cylindrical shape and has an outer diameter smaller than an upper end of the tapered engaging portion of the cutting edge. The combination cutter according to claim 1 or 2 or 3, wherein the lower end of the perforation has a through hole for communicating with the tapered hole, the through hole is cylindrical, and the connecting block is cylindrical and It can move axially in the through hole. The combined milling cutter according to claim 1 or 2 or 3, wherein the cutting edge is made of tungsten steel, and the shank, the connecting block and the shaft bolt are ordinary steel materials. The combination cutter of claim 1 or 2 or 3, wherein the slot is a dovetail slot. The combined milling cutter of claim 1 or 2 or 3, wherein the shaft has a straight rod section and a screw section extending from a bottom surface of the head, the screw section extending from the The lower end of the straight rod section is provided at a lower end portion of the screw section. The combined milling cutter of claim 2, wherein the plurality of circumferential mask planes of the retracting member are clamped by a gripping tool for rotating.