CN214919825U - Tantalum capacitor shell stamping die - Google Patents

Abstract

The utility model provides a tantalum capacitor shell stamping die mainly includes: go up mould subassembly and lower mould subassembly, it down includes from last in proper order to go up the mould subassembly: the die comprises an upper die holder, an upper base plate and an upper clamping plate, wherein a male die is arranged at the upper clamping plate; lower mould subassembly is from up including in proper order down: the die comprises a lower die holder, a lower back plate, a lower backing plate and a lower die plate, wherein a female die is arranged in the lower die plate, and the position and the size of the female die are matched with those of the male die; the outer surface of the male die and the inner surface of the female die are provided with a layer of titanium carbide film, the surface roughness of the contact surface of the male die and the female die ranges from Ra 0.05-0.025 mu m to 82-85 DEG HRC, and the unilateral clearance between the male die and the female die is more than or equal to 25% of the material thickness. In this way, the utility model discloses can solve current tantalum capacitor shell and produce the problem of breaking and the shape is bad in stamping process.

Description

Tantalum capacitor shell stamping die

Technical Field

The utility model belongs to the technical field of tantalum capacitor makes and specifically relates to a tantalum capacitor shell stamping die is related to.

Background

The capacitor is generally used for reactive compensation of a power system, improves power factors, changes voltage quality and gives full play to the efficiency of power generation and supply equipment.

A tantalum capacitor is an electrolytic capacitor. Because tantalum forms a stable anodic oxide film in an acid electrolyte, an electrolytic capacitor made of tantalum does not use an electrolyte like a common electrolytic capacitor, and does not need to be wound by capacitor paper plated with an aluminum film, and almost has no inductance. The tantalum capacitor has the advantages of large capacity, small volume, long service life, high temperature resistance, high accuracy, excellent high-frequency filtering and wave-modifying performance and the like. And the tantalum has unique self-healing performance, so that the long service life and good reliability of the tantalum capacitor are ensured.

Tantalum capacitors are well suited for operation at high temperatures, have a wide variety of shapes, and can be made into small components suitable for surface mounting. The tantalum capacitor is not only applied to the fields of military communication, aerospace and the like, but also widely used in products such as industrial control, movie and television equipment, communication instruments and the like.

A square tantalum capacitor can is generally shown in figure 1 and is typically a drawn square box-shaped piece, conventionally referred to in the art as a box-shaped piece. The dimensional and appearance requirements are critical, which is where the design of the mold is to be attended to.

In general, the wall thickness of the square box is not uniform when the square shell is drawn. The greater the wall thickness, the further away from the bottom of the cartridge. The bottom of the box is thinner, and the thickness of the box is thinner at the position close to the bottom of the box.

The hardness distribution is due to work hardening, and the farther the distance from the bottom of the case, the more severe the work hardening, the higher the hardness. The closer to the bottom of the box, the lower the hardness, the lower the strength, the closer to the hardness of the blank.

This is why the dangerous cross-section is close to the bottom of the cartridge.

In the drawing process, the deformation form and the stress state of three positions of a corner position (R1.0), a side wall (square edge) and four side wall intersection positions (R6.0) of the box-type drawing piece are different. The deformation of the corner portion is the same as that of the ordinary drawing deformation, while the bending deformation is applied to the side wall (square edge) portion, and the bulging deformation is applied to the intersection portion of the four side walls (square edges).

In the process of die testing in the drawing forming process, two different types of inferior-quality products, namely breakage and poor shape, are generated in the tantalum capacitor shell box-shaped piece.

As has already been explained above, the deformed box wall is the force transmission zone, although no large deformation occurs during the subsequent drawing process, but only the drawing force generated by the drawing punch is transmitted to the sheet material which has not yet been drawn into the die and is drawn into the die. Under the action of tensile stress, the blank at this position undergoes a small amount of longitudinal elongation and deformation.

In the drawing process of the square box, the material of the round corner area close to the bottom surface of the square box bears the tensile stress transmitted by the wall of the square box and the pressure and bending action of the drawing male die. Under the combined action of tensile stress and compressive stress, the material of the part is seriously thinned, and cracks are most easily generated, wherein the cracks are dangerous sections.

The stress concentration phenomenon at the intersection of the three surfaces is greater than that at the intersection of the two surfaces. Therefore, cracks mainly occur at the intersection of two side walls and the bottom surface of the capacitor case, that is, at the intersection of three surfaces perpendicular to each other; like the origin position in the rectangular coordinate system (i.e., where the three coordinate axes intersect).

Because of the square box, the bottom of the whole capacitor shell is easy to break at four positions, and the cracks are the same as the outline of the bottom of the capacitor shell, and are regular circular arcs R and adjacent related straight lines which are the same as the outline of the bottom of the capacitor shell (namely the bottom of a convex mould).

This is also true in analogy to conventional blanking processes. In the initial stage of blanking, when the male die is in contact with the blank, the blanking part is separated from the blank, and the situation that the tensile stress generated in the plate causes cracks but is not separated from the blank is avoided.

Cracks sometimes also occur where two sidewalls meet, i.e., where two faces meet. The shape of the crack is irregular, as is the tear separation.

The other defect of the tantalum capacitor square shell drawing piece is poor shape, namely the heights of the wall parts of the drawn capacitor shell are different, namely four box walls (square edges) of the capacitor shell are concave and uneven; or if the four box walls (square edges) of the box-shaped element are convex upwards.

The redundant material at the round corners of the four intersecting lines flows to the two adjacent straight walls, and because the friction resistance of the mold cavity changes, the internal pressure stress changes along with the height of the mold cavity, so that the difference of metal flow is caused, and the defects can be caused, and the unevenness of the square walls is caused. The friction is small, the metal flows easily, the height of the middle part of the straight wall is increased to some extent, and the upward projection is formed. The friction is large and the metal does not flow easily, and the height of the middle part of the straight wall is not increased as fast as the position of the round corner, and the straight wall is concave. At present, no literature report on the deep drawing forming of tantalum materials is found at home.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a tantalum capacitor shell stamping die can solve current tantalum capacitor shell and produce the problem of breaking and the shape is bad in the stamping process.

The main contents of the utility model include: a tantalum capacitor shell stamping die mainly comprises: go up mould subassembly and lower mould subassembly, it down includes from last in proper order to go up the mould subassembly: the die comprises an upper die holder, an upper base plate and an upper clamping plate, wherein a male die is arranged at the upper clamping plate; lower mould subassembly is from up including in proper order down: the die comprises a lower die holder, a lower back plate, a lower backing plate and a lower die plate, wherein a female die is arranged in the lower die plate, and the position and the size of the female die are matched with those of the male die; and a layer of titanium carbide film is arranged on the outer surface of the male die and the inner surface of the female die, and a layer of titanium carbide and titanium nitride film is formed on the surface of the titanium carbide film and the titanium nitride film through physical vapor deposition surface treatment. The surface roughness of the contact surface of the male die and the female die ranges from Ra 0.05-0.025 mu m and HRC 82-85 ℃, and the unilateral clearance between the male die and the female die is more than or equal to 25% of the material thickness.

Preferably, a stripper plate is arranged below the upper clamping plate, a through hole is formed in the position, corresponding to the male die, of the stripper plate, and a plurality of elastic devices are uniformly arranged between the stripper plate and the upper clamping plate.

Preferably, the periphery of the upper end face female die of the lower template is provided with a plurality of counter bores, a plurality of positioning floating pins are arranged in the counter bores, and an elastic device is arranged between the positioning floating pins and the bottoms of the counter bores, so that the initial positions of the positioning floating pins are higher than the upper end face of the lower template.

Preferably, the elastic means is a spring.

Preferably, the position of the stripper plate corresponding to the positioning floating pin is provided with a yielding hole.

Preferably, the bottom of the female die is provided with a limiting block, a material supporting block is arranged above the limiting block, and an elastic device is arranged between the material supporting block and the limiting block, so that the initial position of the material supporting block is flush with the upper end face of the lower template.

Preferably, at least one group of limiting devices are uniformly arranged between the upper die assembly and the lower die assembly.

Preferably, at least one group of guide devices are uniformly arranged between the upper die assembly and the lower die assembly.

The beneficial effects of the utility model reside in that:

1. the outer surfaces of the male die and the female die are provided with a layer of titanium carbide film, the layer of film has high hardness, the surface hardness is greatly improved on the basis that the male die and the female die can ensure that the matrix has certain strength, the wear resistance is greatly improved, the service life of the male die and the female die can be greatly prolonged, and the deformation force of tantalum during deformation is greatly reduced due to the layer of film, so that the capacitor shell is easy to form;

2. the surface roughness ranges from Ra 0.05-0.025 mu m to 82-85 HRC, so that the roughness is reduced, and the molding quality is improved;

3. the unilateral clearance between the male die and the female die is more than 25% of the material thickness, so that the resistance of the blank entering the female die during drawing can be reduced.

Drawings

FIG. 1 is a schematic diagram of a square tantalum capacitor case according to the prior art;

fig. 2 is a schematic structural view of the tantalum capacitor shell stamping die of the present invention before die assembly;

fig. 3 is a schematic structural diagram of the tantalum capacitor shell stamping die after die assembly;

FIG. 4 is a schematic structural diagram of the stripper plate;

FIG. 5 is a schematic structural view of the lower template;

reference numerals: 11. the die comprises an upper die holder, 12, an upper backing plate, 13, an upper clamping plate, 14, a stripper plate, 15, a male die, 16, a limiting column A, 21, a lower die holder, 22, a lower back plate, 23, a lower backing plate, 24, a lower die plate, 25, a female die, 26, a positioning floating pin, 27, a retainer plate, 28, a limiting block, 29, a limiting column B, 141, a through hole, 142, a yielding hole, 143, a guide column hole A, 241 and a guide column hole B.

Detailed Description

The technical solution protected by the present invention will be specifically described below with reference to the accompanying drawings.

As shown in fig. 2, a tantalum capacitor shell stamping die mainly includes: go up mould subassembly and lower mould subassembly, it down includes from last in proper order to go up the mould subassembly: the die comprises an upper die holder 11, an upper backing plate 12 and an upper clamping plate 13, wherein a male die 15 is arranged at the upper backing plate 12; lower mould subassembly is from up including in proper order down: the die comprises a lower die holder 21, a lower back plate 22, a lower backing plate 23 and a lower die plate 24, wherein a female die 25 is arranged in the lower die plate 24, and the position and the size of the female die 25 are matched with those of the male die 15; the outer surfaces of the male die 15 and the female die 25 are provided with a layer of titanium carbide film, the surface roughness of the contact surface of the male die 15 and the female die 25 is Ra 0.025 mu m and 85 DEG HRC, and the unilateral clearance between the male die 15 and the female die 25 is equal to 25% of the material thickness.

Further, in order to smoothly remove the material after the punching is completed, a material removing plate 14 is arranged below the upper clamping plate 13, a through hole 141 is formed in a position where the material removing plate 14 corresponds to the male die 15, and a plurality of springs are uniformly arranged between the material removing plate 14 and the upper clamping plate 13. When taking off the material, take off and fix earlier between flitch 14 and the lower bolster 24, punch plate 13 drives terrace die 15 and promotes, owing to taking off the stopping of flitch 14, the condenser housing that the punching press was accomplished is stayed in die 25, treats that terrace die 15 and condenser housing break away from the back, takes off flitch 14 and upwards promotes along with punch plate 13, accomplishes and takes off the material process.

Four counter bores are formed in the periphery of the upper end face female die of the lower die plate 24, four positioning floating pins 26 (shown in fig. 5) are arranged in the counter bores, and springs are arranged between the positioning floating pins 26 and the bottoms of the counter bores, so that the initial positions of the positioning floating pins 26 are higher than the upper end face of the lower die plate 24. A limiting block 28 is arranged at the bottom of the female die 25, a material supporting block 27 is arranged above the limiting block 28, and a spring is arranged between the material supporting block 27 and the limiting block 28, so that the initial position of the material supporting block 27 is flush with the upper end face of the lower template 24. The material supporting block 27 is arranged for supporting the blank and improving the stamping quality. Before stamping, the blank is placed on the material supporting block 27, and the positioning floating pin 26 limits the position of the blank to prevent the blank from deviating in the stamping process. In the stamping process, along with the descending of the male die 15, the positioning floating pin 26 retracts into the counter bore of the lower die plate 24, and the position of the stripper plate corresponding to the positioning floating pin 26 is provided with a yielding hole 142 (as shown in fig. 4), so that the positioning floating pin 26 is prevented from damaging the stripper plate.

Further, go up the mould subassembly and be provided with two sets of stop device between the mould subassembly down the symmetry: spacing post A16 and spacing post B29 prevent excessively to extrude between last mould subassembly and the lower mould subassembly. The function of protecting the upper die assembly and the lower die assembly is achieved.

Further, at least one set of guiding devices is uniformly arranged between the upper die assembly and the lower die assembly, specifically, as shown in fig. 4 and 5, a guiding post hole a143 and a guiding post hole B241 are respectively arranged at four top corners of the stripper plate and the lower die plate, and a guiding post is arranged in the guiding post hole.

The working process of the utility model is as follows:

firstly, a blank is placed on a material supporting block 27 of a lower template, a positioning floating pin 26 plays a limiting role, then a male die 15 is pressed downwards, the blank is pressed into a female die 25, and a product is formed; and then stripping, wherein firstly, the stripping plate 14 is fixed with the lower template 24, the male die 15 rises, the product cannot rise along with the male die 15 due to the limitation of the stripping plate 14 and still stays in the female die 25, the quality of the product is ensured, after the male die 15 is separated from the product, the stripping plate 14 rises along with the upper clamping plate 13, and finally, the product is taken out, and the stamping process is completed.

The utility model discloses because the surface department of terrace die and die is provided with one deck titanium carbide film, and surface hardness increases substantially, and the wearability improves greatly, can improve the life of terrace die and die greatly, also because this layer of film makes the tantalum deformation force when warping reduce greatly, and the roughness's of terrace die and die scope is Ra 0.05 ~ 0.025 mu m, 82-85 HRC, makes capacitor case take shape easily.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims (8)

1. A tantalum capacitor shell stamping die mainly comprises: go up mould subassembly and lower mould subassembly, it down includes from last in proper order to go up the mould subassembly: the die comprises an upper die holder, an upper base plate and an upper clamping plate, wherein a male die is arranged at the upper clamping plate; lower mould subassembly is from up including in proper order down: the die comprises a lower die holder, a lower back plate, a lower backing plate and a lower die plate, wherein a female die is arranged in the lower die plate, and the position and the size of the female die are matched with those of the male die; the method is characterized in that: the outer surface of the male die and the inner surface of the female die are provided with a layer of titanium carbide film, the surface roughness of the contact surface of the male die and the female die ranges from Ra 0.05-0.025 mu m to 82-85 DEG HRC, and the unilateral clearance between the male die and the female die is more than or equal to 25% of the material thickness.

2. The stamping die for the tantalum capacitor shell as claimed in claim 1, wherein a stripper plate is disposed below the upper clamping plate, a through hole is disposed at a position corresponding to the male die, and a plurality of elastic devices are uniformly disposed between the stripper plate and the upper clamping plate.

3. The tantalum capacitor shell stamping die as claimed in claim 2, wherein a plurality of counter bores are formed in the periphery of the upper end face female die of the lower die plate, a plurality of positioning floating pins are arranged in the counter bores, and an elastic device is arranged between the positioning floating pins and the bottoms of the counter bores, so that the initial positions of the positioning floating pins are higher than the upper end face of the lower die plate.

4. The tantalum capacitor shell stamping die as claimed in claim 2 or 3, wherein the elastic means is a spring.

5. The tantalum capacitor shell stamping die as claimed in claim 3, wherein a relief hole is formed at a position of the stripper plate corresponding to the positioning floating pin.

6. The stamping die for tantalum capacitor shells as recited in claim 1, wherein a limiting block is disposed at the bottom of the female die, a material supporting block is disposed above the limiting block, and an elastic device is disposed between the material supporting block and the limiting block, so that the initial position of the material supporting block is flush with the upper end surface of the lower template.

7. The tantalum capacitor shell stamping die as claimed in claim 1, wherein at least one set of limiting devices is uniformly arranged between the upper die assembly and the lower die assembly.

8. The tantalum capacitor shell stamping die as claimed in claim 1, wherein at least one set of guiding devices is uniformly arranged between the upper die assembly and the lower die assembly.

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