CN111822701A - Forming dies, equipment and forming processes for testing magnetic cores - Google Patents

Abstract

The present invention discloses a molding die, equipment and molding process for testing magnetic cores. The molding die comprises: a mold body, a mold cavity is arranged inside the mold cavity, a molding area for making products is arranged inside the mold cavity, a spacing is provided between the molding area and a side wall of the mold cavity, and a connecting portion can be formed at its U-shaped opening through the spacing during molding of the product. The molding material is placed in the mold cavity and sintered to initially obtain the product, and a connecting portion is formed at the U-shaped opening of the product, so as to avoid residual stress of the product during molding, and to prevent the U-shaped opening from bending and deformation due to factors such as cooling of the product after sintering. After the product is molded, the redundant connecting portion is removed by means such as grinding to obtain a test magnetic core, thereby improving product quality and reducing production costs.

Description

Forming dies, equipment and forming processes for testing magnetic cores

technical field

The invention relates to the technical field of powder metallurgy stamping and forming, in particular to a forming die, equipment and forming process for testing magnetic cores.

Background technique

As shown in FIG. 1 , for the test magnetic core, the test magnetic core is ultra-thin and has a multi-level step design, and has a bifurcated opening to form a U-shaped opening structure. For this type of test core, the engraving machine is generally used to engrave ferrite blocks, but the above production methods have the problems of high labor intensity and low production efficiency; if the conventional die-casting mold design method is used for production, the After the finished product is taken out, the finished product will be bent and deformed, which affects the quality of the product or even cannot be used, increasing the production cost.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a molding die for testing magnetic cores, which can prevent product deformation and improve product quality.

The present invention also proposes a device for applying the above-mentioned forming mold for testing the magnetic core.

The present invention also proposes a molding process using the above-mentioned equipment.

The forming mold for testing magnetic core according to the first aspect of the present invention includes: a mold body, a mold cavity is provided in the mold cavity, and a forming area for making a product is disposed in the mold cavity, and the forming area is connected with the mold cavity. There is a space between one side wall of the mold cavity, and the product can be formed with a connecting portion at the U-shaped opening through the space during molding.

The forming mold for testing the magnetic core according to the embodiment of the present invention has at least the following beneficial effects: by placing the forming material in the mold cavity and sintering to obtain a preliminary product, a connection part is formed at the U-shaped opening of the product to prevent the product from being Residual stress is generated during molding, and it can prevent bending deformation at the U-shaped opening caused by factors such as cooling of the product after sintering. After the product is formed, the redundant connection parts are removed by means such as grinding to obtain the test magnetic core, which improves the product quality and reduces the production cost.

According to some embodiments of the present invention, the mold cavity has a rectangular structure, the molding area includes a first molding surface and a second molding surface, the first molding surface is lower than the second molding surface, and the second molding surface is lower than the second molding surface. The molding surface is divided into a first area and two second areas in turn, the two second areas are symmetrically arranged with respect to the first area, and the upper surface of the second area is lower than the upper surface of the first area , the front end of the first area extends to the first molding surface, and the first area is provided with a raised portion connected to both sides of the mold cavity in the middle of the first area, and the distance is located at the raised portion between the rear end of the cavity and the rear sidewall of the cavity.

According to some embodiments of the present invention, the mold body includes: an upper mold, one end surface of the upper mold is provided with a first concave mold, a middle part of the first concave mold is provided with a concave part, and a rear part of the concave part is provided There is a first distance from the end to the outer side surface of the upper mold; a female mold, a mold hole is arranged on the female mold; a lower mold component, the lower mold component structure is inserted into the mold hole, the lower mold The component cooperates with the mold hole to form a second concave mold, the first concave mold and the second concave mold enclose the mold cavity, the convex part is arranged on the lower mold component, and the convex part is There is a second distance between the rear end of the raised portion and the second female mold, and the first distance and the second distance are matched to form the distance.

According to some embodiments of the present invention, the drag assembly includes: a middle rod, the protruding part is located in a middle part of the middle rod and can be inserted into the concave part, and the protruding part includes the middle rod A first boss whose top surface extends in the axial direction and a second boss whose side surface of the middle rod extends radially; The insertion channel, the insertion channel is a rectangular structure, the side walls on the opposite sides of the insertion channel are stepped at the ends, and the other side wall of the insertion channel corresponds to the second The boss is provided with a groove, the second distance is located between a side wall of the insertion channel opposite to the groove and the outer side surface of the lower mold, and the middle rod is inserted into the insertion channel. A channel is installed, and the topmost surface of the drag is lower than the top surface of the middle rod.

According to some embodiments of the present invention, the concave portion is a channel passing through the upper mold, and the cross section of the upper mold is a zigzag shape.

According to some embodiments of the present invention, the value of the vertical distance from the upper end surface of the protruding portion to the bottom surface of the second die is smaller than the value of the axial length of the channel.

According to some embodiments of the present invention, the bottom of the middle rod is connected with a first base, and the middle rod is eccentrically arranged on the first base.

According to some embodiments of the present invention, the edge of the die hole is provided with a material spray chute matched with the second die.

The apparatus according to the embodiment of the second aspect of the present invention includes the forming mold for testing the magnetic core according to the embodiment of the first aspect of the present invention.

The device according to the embodiment of the present invention has at least the following beneficial effects: the forming mold with the test magnetic core is installed, and a product is initially obtained by placing the forming material in the mold cavity and sintering, and a connection is formed at the U-shaped opening of the product. It can prevent the product from generating residual stress during molding, and can prevent the U-shaped opening of the product from being bent and deformed due to factors such as cooling after sintering. After the product is formed, the redundant connection parts are removed by means such as grinding to obtain the test magnetic core, which improves the product quality and reduces the production cost.

The molding process according to the embodiment of the third aspect of the present invention, using the equipment described in the embodiment of the second aspect of the present invention, includes the following steps: molding, by placing the molding material in the mold cavity and sintering to initially obtain a product; Trimming, removing excess trim of the product obtained in the step.

The molding process according to the embodiment of the present invention has at least the following beneficial effects: by placing the molding material in the mold cavity and sintering to obtain a preliminary product, a connecting portion is formed at the U-shaped opening of the product, so as to avoid residues during molding. Stress, and can prevent the sintered product from being cooled and other factors to cause bending deformation at the U-shaped opening. After the product is formed, the redundant connection parts are removed by means such as grinding to obtain the test magnetic core, which improves the product quality and reduces the production cost.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

Fig. 1 is the schematic diagram of testing magnetic core;

FIG. 2 is a schematic diagram of a product obtained by using the molding die for testing the magnetic core according to the embodiment of the present invention.

3 is a schematic structural diagram of a molding die for testing a magnetic core according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of another viewing angle of FIG. 3;

Fig. 5 is the structural representation of mother type;

6 is a schematic cross-sectional view of FIG. 5;

FIG. 7 is a schematic structural diagram of a lower component;

Fig. 8 is the structural representation of the middle rod;

FIG. 9 is a schematic structural diagram of another viewing angle of FIG. 8;

Fig. 10 is the partial structure schematic diagram of Fig. 8;

11 is a schematic structural diagram of a lower mold;

FIG. 12 is a schematic structural diagram of FIG. 11 from another viewing angle.

Reference number:

The mold body 10, the first molding surface 11, the second molding surface 12, the first region 121, the second region 122, and the raised portion 123;

Spacing 20, first spacing 21, second spacing 22;

Product 30, Connection part 31

Upper mold 40, first concave mold 41, concave portion 42, second base 43;

Mother type 50, die hole 51, material spray chute 52;

The drag assembly 60 , the second female die 61 , the middle rod 62 , the first base 621 , the drag 63 , the insertion channel 631 , the groove 632 , and the third base 633 .

Detailed ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

In the description of the present invention, it should be understood that the azimuth description, such as the azimuth or positional relationship indicated by up, down, front, rear, etc., is based on the azimuth or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention. The invention and simplified description do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, if it is described that the first and the second are only for the purpose of distinguishing technical features, it should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating The order of the indicated technical features.

In the description of the present invention, unless otherwise clearly defined, words such as setting, installation, connection should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

As shown in FIG. 1, FIG. 2, FIG. 3 and FIG. 4, the forming mold for testing the magnetic core according to the embodiment of the first aspect of the present invention includes: a mold body 10, which is provided with a mold cavity, and the mold cavity is provided with a mold for In the forming area of the product 20 , there is a distance 30 between the forming area and a side wall of the mold cavity, and a connecting portion 21 can be formed at the U-shaped opening of the product 20 through the distance 30 during molding.

According to the molding die for testing the magnetic core according to the embodiment of the present invention, the product 20 is initially obtained by placing the molding material in the cavity and sintering, and a connecting portion 21 is formed at the U-shaped opening of the product 20 to prevent the product 20 from forming Residual stress is generated, and the sintered product 20 can be prevented from being bent and deformed at the U-shaped opening due to factors such as cooling. After the product 20 is formed, the redundant connecting portion 21 is removed by means such as grinding to obtain a test magnetic core, as shown in FIG. 1 , which improves the quality of the product 20 and reduces the production cost.

As shown in FIG. 2 to FIG. 12 , in some embodiments of the present invention, the mold cavity has a rectangular structure, the molding area includes a first molding surface 11 and a second molding surface 12 , and the first molding surface 11 is lower than the second molding surface. 12. The second molding surface 12 is divided into a first area 121 and two second areas 122 in turn. The two second areas 122 are symmetrically arranged with respect to the first area 121, and the upper surface of the second area 122 is lower than the first area 121. The front end of the first region 121 extends to the first molding surface 11, and the first region 121 is provided with a raised portion 123 in the middle thereof connected to both sides of the cavity, and the distance 30 is located at the rear end of the raised portion 123 part and the rear side wall of the cavity. By adopting the above structure, the product 20 as shown in FIG. 2 is obtained, which is convenient to operate, simple in structure, and can meet the precision requirements of the product 20 .

As shown in FIGS. 1 to 12 , in some embodiments of the present invention, the mold body 10 includes: an upper mold 40 , one end surface of the upper mold 40 is provided with a first concave mold 41 , and a middle part of the first concave mold 41 is provided with a The recessed part 42 has a first distance 31 from the rear end of the recessed part 42 to the outer side of the upper mold 40; the female mold 50 is provided with a die hole 51 on the female mold 50; the lower mold assembly 60, the lower mold assembly 60 is structurally inserted in The die hole 51, the lower die assembly 60 cooperates with the die hole 51 to form a second concave die 61, the first concave die 41 and the second concave die 61 enclose a die cavity, and the convex part 123 is arranged on the die assembly 60, and the convex There is a second distance between the rear end of the portion 123 and the second female mold 61 , and the first distance 31 and the second distance 32 cooperate to form the distance 30 . In the split assembly, the molding powder is filled in the second die 61 , and the upper mold 40 is moved toward the lower mold assembly 60 to close the mold, which facilitates processing and molding of the product 20 and can ensure the accuracy of the product 20 .

In some embodiments, the end surface of the upper mold 40 facing the lower mold component 60 may also be a plane, which is not limited herein.

In some embodiments of the present invention, the drag assembly 60 includes: a middle rod 62 , the raised portion 123 is located in the middle of the middle rod 62 and can be inserted into the recessed portion 42 , and the raised portion 123 includes a top surface edge of the middle rod 62 . The first boss extending axially and the second boss extending radially from the side of the middle rod 62; the lower mold 63, the lower mold 63 is provided with an insertion channel 631 that is adapted to the middle rod 62 and deviates from the middle, The insertion channel 631 has a rectangular structure, the side walls on opposite sides of the insertion channel 631 are stepped at the ends, and the other side wall of the insertion channel 631 is provided with a groove 632 corresponding to the second boss. The distance 32 is located between the side wall of the insertion channel 631 opposite to the groove 632 and the outer side of the lower mold 63 , the middle rod 62 is inserted in the insertion channel 631 , and the top surface of the lower mold 63 is lower than the middle rod 62 the top surface. The structure is simple, the assembly is convenient, the replacement is convenient, and the precision requirements of the product 20 can be ensured.

It should be noted that the first concave mold 41 and the second concave mold 61 are both rectangular structures; the width of the spacing 30 is equal to the width of the first spacing 31 and the width of the second spacing 32 ; the first area 121 is the middle The top surface of the rod 62, the second area 122 is the inner side wall of the insertion channel 631 to the end face of the outer side of the lower mold 63 at the end; the lower mold is the fixed mold, the upper mold 40 is the movable mold, and the upper mold 40 can Move toward the lower mold to complete the mold clamping; the recessed part 42 is used to avoid the raised part 123, and the raised part 123 is inserted into the recessed part 42 when the mold is closed; the connecting part 21 is the connecting wall of the U-shaped opening of the product 20, and the connecting wall It is integrally formed with the product 20 and can block the U-shaped opening, so that the obtained product 20 is closed and has a back-shaped structure; the upper type 40 is installed with a lifting device for driving the upper type 40 to move towards the lower type assembly 60 . and other devices.

As shown in FIG. 3 and FIG. 4 , in some embodiments of the present invention, the concave portion 42 is a channel penetrating the upper mold 40 , and the cross section of the upper mold 40 is a zigzag shape, which has a simple structure and is easy to manufacture.

It can be understood that, as shown in FIGS. 3 , 4 , and 7 to 10 , in some embodiments of the present invention, the value of the vertical distance from the upper end surface of the raised portion 123 to the bottom surface of the second die 61 is smaller than that of the channel Axial length value of 30, avoids powder clogging in the hole, and facilitates the mold parting of the upper mold 40 and the lower mold 30. In a specific embodiment, the vertical distance from the upper end surface of the first boss to the bottom surface of the second die 61 is one tenth to one fifth of the axial length of the channel. It can be understood that, in some embodiments of the present invention, the channel is a rectangular structure, of course, other shapes of products can also be other structures.

As shown in FIGS. 7 to 9 , in some embodiments of the present invention, the bottom of the middle rod 62 is connected with a first base 621 , and the middle rod 62 is eccentrically arranged on the first base 621 . When the mold is closed, the product 20 is It can be uniformly stressed and easy to process, so as to ensure the accuracy requirements of the product 20 .

It should be noted that the end of the upper mold 40 facing away from the first female mold 41 is provided with a second base 43 , and the end of the lower mold 63 facing away from the stepped shape is provided with a third base 633 for installation.

As shown in FIG. 3 to FIG. 6 , in some embodiments of the present invention, the edge of the die hole 51 is provided with a material spray chute 52 matched with the second female die 61 . During the molding process, the powder in the relatively high-density parts will be ejected through the material spray chute 52, so that the density of each part is uniform when the above-mentioned product 20 is formed, and the warpage and deformation caused by the difference in density can be avoided or minimized. To achieve the purpose of mass production of test magnetic cores, and the design is simple.

It should be noted that, in some embodiments of the present invention, the step height of the molding die is calculated according to the compression ratio of the powder.

The apparatus according to the embodiment of the second aspect of the present invention includes the molding die for testing the magnetic core of the embodiment of the first aspect of the present invention.

According to the apparatus of the embodiment of the present invention, the forming mold with the test magnetic core installed, the forming mold with the test magnetic core installed, the product 20 is preliminarily obtained by placing the molding material in the mold cavity and sintering, and the U of the product 20 is A connecting portion 21 is formed at the U-shaped opening to avoid residual stress of the product 20 during molding, and to prevent the product 20 from being refrigerated after sintering and other factors from causing bending deformation at the U-shaped opening. After the product 20 is formed, the redundant connecting portion 21 is removed by means such as grinding to obtain a test magnetic core, as shown in FIG. 1 , which improves the quality of the product 20 and reduces the production cost.

The molding process according to the third aspect of the present invention, using the above-mentioned equipment of the second aspect of the present invention, includes the following steps: molding, by placing the molding material in a mold cavity and sintering to obtain a preliminary product 20; trimming, The excess offcuts of the product 20 obtained in the step are removed.

The molding process according to the embodiment of the present invention has at least the following beneficial effects: the product 20 is initially obtained by placing the molding material in the mold cavity and sintering, and a connecting portion 21 is formed at the U-shaped opening of the product 20 to prevent the product 20 from being damaged. Residual stress is generated during molding, and the sintered product 20 can be prevented from being bent and deformed at the U-shaped opening due to factors such as cooling. After the product 20 is formed, the redundant connecting portion 21 is removed by means such as grinding to obtain a test magnetic core, as shown in FIG. 1 , which improves the quality of the product 20 and reduces the production cost.

It can be understood that, using the above forming process, the product 20 shown in FIG. 2 is first produced, and then the connecting portion 21 of the product 20 is ground by grinding means to obtain the test magnetic core shown in FIG. 1 .

It should be noted that the grinding method is to use grinding equipment to grind while watering, and to obtain the test magnetic core as shown in FIG. 1 after at least three times of grinding.

Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art can make equivalent modifications or replacements without departing from the spirit of the present invention, and these equivalent modifications or replacements are included in the claims of the present application. within a limited range.

Claims (10)

1. Test forming die of magnetic core, its characterized in that includes:

the die comprises a die body (10) provided with a die cavity, wherein a forming area for manufacturing a product (20) is arranged in the die cavity, a space (30) is formed between the forming area and one side wall of the die cavity, and the product (20) can form a connecting part (21) at a U-shaped opening through the space (30) during forming.

2. The mold for testing magnetic cores of claim 1, wherein the mold cavity has a rectangular configuration, the forming zone comprising a first forming surface (11) and a second forming surface (12), the first forming surface (11) being lower than the second forming surface (12), the second forming surface (12) being divided in turn into a first zone (121) and two second zones (122), the two second zones (122) being arranged symmetrically with respect to the first zone (121), and the upper surface of the second region (122) is lower than the upper surface of the first region (121), the front end of the first region (121) extending to the first molding surface (11), and the middle part of the first area (121) is provided with a convex part (123) connected with two side surfaces of the die cavity, the spacing (30) is between a rear end of the boss (123) and a rear sidewall of the mold cavity.

3. The forming die for testing a magnetic core according to claim 2, wherein the die body (10) comprises:

the die comprises an upper die (40), wherein a first concave die (41) is arranged on one end face of the upper die (40), a concave part (42) is arranged in the middle of the first concave die (41), and a first distance (31) is formed from the rear end part of the concave part (42) to the outer side face of the upper die (40);

the mould comprises a female mould (50), wherein a mould hole (51) is formed in the female mould (50);

the lower die assembly (60) is structurally inserted into the die hole (51), a second female die (61) is formed by the lower die assembly (60) and the die hole (51) in a matched mode, the first female die (41) and the second female die (61) enclose the die cavity, the protruding portion (123) is arranged on the lower die assembly (60), a second interval is formed between the rear end portion of the protruding portion (123) and the second female die (61), and the first interval (31) and the second interval (32) are matched to form the interval (30).

4. The mold for molding a test core according to claim 3, wherein the lower mold member (60) comprises:

the middle rod (62), the said lobe (123) locates in the middle part of the said middle rod (62) and can insert and locate in the said dent (42), the said lobe (123) includes the first boss that the top surface of the said middle rod (62) extends along axial direction and the second boss that the side of the said middle rod (62) extends along radial direction;

lower type (63), be provided with on lower type (63) with well stick (62) looks adaptation and skew cartridge passageway (631) at middle part, cartridge passageway (631) are the rectangle structure, the lateral wall of relative both sides is the echelonment in the tip on cartridge passageway (631), correspond on another lateral wall of cartridge passageway (631) the second boss is provided with recess (632), second interval (32) are located on cartridge passageway (631) with a relative lateral wall of recess (632) extremely between the lateral surface of lower type (63), well stick (62) are inserted and are located cartridge passageway (631), just down type (63) the top surface is less than the top surface of well stick (62).

5. The mold for molding a test core according to claim 3 or 4, wherein the recess (42) is a hole penetrating the upper mold (40), and the cross section of the upper mold (40) is a Chinese character 'hui' shape.

6. The forming die for testing the magnetic core according to claim 5, wherein the vertical distance value from the upper end face of the convex part (123) to the bottom face of the second concave die (61) is smaller than the axial length value of the pore channel.

7. The mold for testing magnetic cores according to claim 4, wherein a first base (621) is connected to the bottom of the middle rod (62), and the middle rod (62) is eccentrically disposed on the first base (621).

8. The mold for testing magnetic cores according to claim 3, wherein the edge of the die hole (51) is provided with a spout chute (52) that cooperates with the second female die (61).

9. Apparatus comprising a mould for testing a magnetic core according to any of claims 1 to 8.

10. A molding process, characterized in that the apparatus of claim 9 is used, comprising the steps of:

shaping, by placing a shaped material in the cavity and sintering to obtain a product (20) preliminarily;

trimming, removing excess scrap of the product (20) obtained in the step.

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