CN117900474A - Tantalum block forming die of solid electrolytic capacitor and forming method thereof - Google Patents

Abstract

The invention discloses a solid electrolytic capacitor tantalum block forming die and a forming method thereof, and belongs to the technical field of solid electrolytic capacitor manufacturing. The die comprises a die base, a die body, a limit stop, a left die, a right die, a front die and an upper die, wherein the die body is arranged on the base, a positioning groove A is formed in one side of the die body, a positioning groove B is formed in the lower portion of the positioning groove A, the limit stop is arranged in the positioning groove B, the left die and the right die are symmetrically arranged and are in sliding connection with the positioning groove A and the limit stop, the front die is in sliding connection with the die body and is positioned on one side of the die body, which is provided with the positioning groove A, the upper die is positioned right above the limit stop, and blanking channels are correspondingly formed in the die body, the front die, the limit stop and the base. The anode core adopts a discharging mode, so that equipment investment or labor cost can be reduced, and the manufacturing efficiency of the anode core can be improved.

Description

Tantalum block forming die of solid electrolytic capacitor and forming method thereof

Technical Field

The invention relates to a solid electrolytic capacitor tantalum block forming die and a forming method thereof, and belongs to the technical field of solid electrolytic capacitor manufacturing.

Background

In the manufacturing process of the solid electrolytic capacitor, metal tantalum powder is required to be pressed into an anode tantalum core with certain mechanical strength through a forming die. With the requirement of complete equipment, the electrical performance parameters of the product are higher and higher, and if scratches and damaged pores exist on the surface of the anode tantalum core formed by pressing a die, the electrical performance parameters of the manufactured solid electrolytic capacitor are consistent and the use reliability is adversely affected to a certain extent.

The Chinese patent document with publication number CN204035554U discloses a tantalum block vertical processing equipment forming die, when in use, tantalum wires penetrate from through holes arranged on an upper die, a lower die stretches into a die cavity, after tantalum powder is filled into the die cavity by a powder shaking mechanism, the upper die and the lower die press the tantalum powder under the action of a servo motor, the tantalum powder is pressed into regular cuboid or cylinder, the tantalum wires are inserted into the tantalum blocks in the pressing process, and the pressed tantalum blocks are ejected out of the die cavity under the action of the lower die. In the process of pressing the tantalum blocks by the forming die, the pressing pressure is high, the density of the tantalum blocks is uniform, V-shaped cracks around the tantalum wires formed by transverse pressing forming can be eliminated in the vertical pressing process, and the forming die is very beneficial to improving the product quality and ensuring the reliability of the products. And the die cavity opening mechanism can control the moving slide block to adjust the size of the die cavity, and when the tantalum block is ejected out of the die cavity by the lower die, the moving slide block moves backwards so that the die cavity is enlarged, and the phenomenon that the surface of the tantalum block is in contact with the surface of the die cavity to cause brightening is avoided.

However, when the lower die ejects the tantalum block out of the die cavity, the tantalum block on the lower die needs to be removed manually or by equipment, so that not only can the labor cost or the equipment investment be increased, but also the resetting time of the lower die can be prolonged by additional actions, and the manufacturing efficiency of the tantalum block is reduced.

Disclosure of Invention

In order to solve the technical problems, the invention provides a solid electrolytic capacitor tantalum block forming die and a forming method thereof.

The invention is realized by the following technical scheme:

A tantalum block forming die of a solid electrolytic capacitor comprises a die base, a die body, a limit stop, a left die, a right die, a front die and an upper die, wherein the die body is arranged on the base, one side of the die body is provided with a positioning groove A, the lower part of the positioning groove A is provided with a positioning groove B, the limit stop is arranged in the positioning groove B, the left pressing die and the right pressing die are symmetrically arranged and are in sliding connection with the positioning groove A and the limit stop, the front pressing die is in sliding connection with the die body and is positioned on one side of the die body, which is provided with the positioning groove A, the upper pressing die is positioned right above the limit stop, and blanking channels are correspondingly arranged on the die body, the front pressing die, the limit stop and the base.

Four slide bars are arranged side by side on the die body close to the front pressing die, penetrate through the front pressing die and are in sliding connection with the front pressing die, and two of the four slide bars penetrate through the limit stop block.

A blanking groove A is vertically formed in the bottom surface of the positioning groove A on the die body, and a blanking groove B is vertically formed in the position corresponding to the blanking groove A on the front pressing die;

The lower side of the base is provided with a tantalum block collecting box.

The bottom surface of the positioning groove A is a first side surface, the distance between the front pressing die and the first side surface in the die closing state is l ₁, and the distance between the front pressing die and the first side surface in the die opening state is l ₂ and l ₁＜l₂≤1.2l₁.

The first side surface, the limit stop, the left pressing die, the right pressing die, the front pressing die and the upper pressing die enclose a die cavity for pressing the tantalum block in a die assembly state.

The die cavity is cuboid or other polyhedrons.

And the limit stop is provided with a material dropping groove C, and the width of the limit stop extending out of the positioning groove B is d ₁ and l ₁＜d₁≤3l₁.

The width of the die body is d ₂ and 5l ₁＜d₂.

And a through hole A is vertically formed in the upper pressing die.

A molding method of a tantalum block molding die of a solid electrolytic capacitor comprises the following steps:

step one, closing the left pressing die, the right pressing die and the front pressing die from a standby position, and forming a die cavity with an upper opening together with a die body and a limit stop;

Filling metal tantalum powder into the die cavity;

Step three, one end of the tantalum wire passes through a through hole A on the upper pressing die and is inserted into metal tantalum powder in the die cavity, and then the upper pressing die is downwards pressed on the die body and the front pressing die, so that the die cavity is closed;

step four, the left pressing die and the right pressing die move to a certain distance in a direction of approaching each other, and metal tantalum powder is extruded inwards to form an anode core;

cutting off the tantalum wire, and returning the upper pressing die and the front pressing die to a waiting machine position;

step six, pushing the anode core to a blanking channel by the left pressing die and the right pressing die;

and step seven, repeating the step one to the step six, and completing the tantalum block forming work one by one.

The invention has the beneficial effects that: when the left press die, the right press die, the front press die and the upper press die are matched with the die body and the limit stop to press the metal tantalum powder into an anode core, then the upper press die and the front press die are retracted to a waiting machine position to loosen the anode core, the aim of obviously reducing friction force between the anode core and the forming die in the process of pushing the anode core to a blanking channel by the left press die and the right press die is fulfilled, the problems that the surface of the anode core of the solid electrolytic capacitor is scratched and the pores are damaged are solved, the lead-out of the capacitance of the anode core is facilitated, and the consistency of electrical parameters and the use reliability of the prepared solid electrolytic capacitor are improved. After the left pressing die and the right pressing die push the anode core to the blanking channel, the anode core does free falling motion under the action of dead weight, so that automatic blanking of the anode core is realized.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of the structure of the present invention when an anode core is pressed;

FIG. 3 is a schematic view of the structure of the mold body of the present invention;

FIG. 4 is a schematic view of the limit stop of the present invention;

FIG. 5 is a schematic view of the structure of the left stamper of the present invention;

Fig. 6 is a schematic structural view of the right stamper of the present invention.

In the figure: the die comprises a base, a die body, a 20-positioning groove A, a 21-positioning groove B, a 22-blanking groove A, a 3-limit stop, a 30-blanking groove C, a 4-left die, a 5-right die, a 6-front die, a 60-blanking groove B, a 7-upper die, a 70-through hole A, 8-tantalum wires, a 9-first side surface, a 10-anode core, an 11-blanking channel and a 12-slide bar.

Detailed Description

The technical solution of the present invention is further described below, but the scope of the claimed invention is not limited to the above.

As shown in fig. 1 to 6, the solid electrolytic capacitor tantalum block forming die of the present invention comprises a die base 1, a die body 2, a limit stop 3, a left die 4, a right die 5, a front die 6 and an upper die 7, wherein the die body 2 is mounted on the base 1, a positioning groove a20 is formed on one side of the die body 2, a positioning groove B21 is formed at the lower part of the positioning groove a20, the limit stop 3 is mounted in the positioning groove B21, the left die 4 and the right die 5 are symmetrically arranged and are in sliding connection with the positioning groove a20 and the limit stop 3, the front die 6 is in sliding connection with the die body 2 and is positioned on one side of the die body 2 where the positioning groove a20 is processed, the upper die 7 is positioned right above the limit stop 3, and blanking channels 11 are correspondingly processed on the die body 2, the front die 6, the limit stop 3 and the base 1. When in use, the left pressing die 4 and the right pressing die 5 are positioned in a U-shaped groove surrounded by the top surface of the limit stop 3, the bottom surface of the positioning groove A20 and the side surface of the positioning groove A20 and are in sliding connection with the U-shaped groove, the side surfaces of the left pressing die 4 and the right pressing die 5 far away from the die body 2 are coplanar with the side surfaces of the limit stop 3 far away from the die body 2, and when the front pressing die 6 is matched with the die, the left pressing die 4, the right pressing die 5 and the limit stop 3 are attached. The mounting positions of the limit stop 3 are positioned through the positioning groove B21, and the mounting positions of the left pressing die 4 and the right pressing die 5 are positioned through the matching of the positioning groove A20 and the limit stop 3, so that the relative position accuracy of the limit stop 3 and the left pressing die 4 and the right pressing die 5 is ensured. When the left pressing die 4, the right pressing die 5, the front pressing die 6 and the upper pressing die 7 are matched with the die body 2 and the limit stop 3 to press metal tantalum powder into an anode core 10 (namely tantalum block), then the upper pressing die 7 and the front pressing die 6 are retracted to a waiting position to loosen the anode core 10, and the purpose of obviously reducing friction force between the anode core 10 and a forming die in the process that the left pressing die 4 and the right pressing die 5 push the anode core 10 to a blanking channel 11 is achieved, so that the problems of scratch and void damage on the surface of the anode core 10 of the solid electrolytic capacitor are solved, the extraction of capacitance of the anode core 10 is facilitated, and the consistency of electrical parameters and the use reliability of the prepared solid electrolytic capacitor are improved. After the left pressing die 4 and the right pressing die 5 push the anode core 10 to the blanking channel 11, the anode core 10 does free falling motion under the action of dead weight, so that the automatic blanking of the anode core 10 is realized, and by adopting the blanking mode, equipment or manpower is not required to be additionally added except a forming die for blanking the anode core 10, so that the equipment investment or the labor cost can be reduced, and the manufacturing efficiency of the anode core 10 can be improved.

Four slide bars 12 are arranged on one side of the die body 2 close to the front surface pressing die 6 side by side, the four slide bars 12 penetrate through the front surface pressing die 6 and are in sliding connection with the front surface pressing die 6, and two of the four slide bars 12 penetrate through the limit stop 3. The front face pressing die 6 is slidably connected with the four slide bars 12, so that the movement stability of the front face pressing die 6 can be improved.

A blanking groove A22 is vertically formed in the bottom surface of the positioning groove A20 on the die body 2, and a blanking groove B60 is vertically formed in the front pressing die 6 at a position corresponding to the blanking groove A22;

A tantalum block collection box is placed on the lower side of the base 1. When the blanking device is used, the length and width dimensions of the blanking channel 11 are larger than those of the anode core 10, the upper section of the blanking channel 11 is surrounded by a blanking groove B60 and a blanking groove A22 in a die opening state, the middle section is a blanking groove C30, and the lower section is a blanking hole formed in the die base 1. The fabricated anode core 10 was uniformly collected by a tantalum block collection box.

The bottom surface of the positioning groove a20 is a first side surface 9, the distance between the front pressing die 6 and the first side surface 9 in the die closing state is l ₁, and the distance between the front pressing die 6 and the first side surface 9 in the die opening state is l ₂ and l ₁＜l₂≤1.2l₁. The surface friction force generated in the process of pushing the anode core 10 to the blanking channel 11 by the left pressing die 4 and the right pressing die 5 is reduced by increasing the distance between the front pressing die 6 and the die body 2 during die opening, so that the problems of scratch and hole damage on the surface of the anode core 10 of the solid electrolytic capacitor are solved, the extraction of the capacitance of the anode core 10 is facilitated, and the consistency of the electrical parameters and the use reliability of the prepared solid electrolytic capacitor are improved. The distance l ₂ between the front side pressing die 6 and the first side surface 9 in the die opening state is limited between l ₁ and 1.2l ₁, so that the anode core 10 can be loosened after the anode core 10 is formed, the friction force between the anode core 10 and a forming die can be obviously reduced, the moving process of the front side pressing die 6 can be limited in a smaller range, the die closing and die opening time of the front side pressing die 6 is prevented from being overlong, and the efficiency of manufacturing the anode core 10 by the forming die can be improved.

The first side 9, the limit stop 3, the left die 4, the right die 5, the front die 6 and the upper die 7 enclose a die cavity for pressing the tantalum block in a die-assembled state.

The die cavity is cuboid or other polyhedrons.

The blanking groove C30 is processed on the limit stop 3, and the width of the locating groove B21 extending out of the limit stop 3 is d ₁ and l ₁＜d₁≤3l₁. As shown in fig. 1, the width of the limit stop 3 refers to the dimension of the limit stop 3 in the length direction of the slide rod 12, and the width d ₁ of the limit stop 3 is limited between l ₁ and 3l ₁, so that the loading amount of the metal tantalum powder in the die cavity in the second step is limited within a required range, and the dimension and the mechanical property of the anode core 10 pressed and molded by the molding die are ensured to meet the requirements. If the width of the limit stop 3 is too small, the filling amount of the metal tantalum powder in the die cavity in the second step is too small, and although the size of the anode core 10 pressed and molded by the molding die can be ensured to meet the requirement, the metal tantalum powder forming the anode core 10 is too loose, and the mechanical property of the metal tantalum powder does not meet the requirement; if the width of the limit stop 3 is too large, the metal tantalum powder filling amount in the die cavity in the second step is too large, and although the mechanical properties of the anode core 10 pressed and molded by the molding die can be ensured to meet the requirements, it is difficult to ensure that the size of the anode core 10 meets the requirements on the one hand, and if the size of the anode core 10 is made to meet the requirements on the other hand, the pressures of the left die 4, the right die 5, the front die 6 and the upper die 7 on the metal tantalum powder are greatly increased, resulting in a decrease in the stability of the molding die.

The width of the die body 2 is d ₂ and 5l ₁＜d₂. The width of the die body 2 refers to the dimension of the die body 2 in the length direction of the slide rod 12, and 5l ₁＜d₂ ensures that the strength and the rigidity of the die body 2 meet the requirements.

The upper pressing die 7 is vertically provided with a through hole A70.

A molding method of a tantalum block molding die of a solid electrolytic capacitor comprises the following steps:

Step one, clamping the left pressing die 4, the right pressing die 5 and the front pressing die 6 from a standby position, and forming a die cavity with an upper opening together with the die body 2 and the limit stop 3;

Filling metal tantalum powder into the die cavity;

step three, one end of the tantalum wire 8 passes through a through hole A70 on the upper pressing die 7 and is inserted into metal tantalum powder in a die cavity, and then the upper pressing die 7 is downwards pressed on the die body 2 and the front pressing die 6, so that the die cavity is closed;

Step four, the left pressing die 4 and the right pressing die 5 move a certain distance in the direction of approaching each other, and metal tantalum powder is pressed inwards to form an anode core 10;

cutting off the tantalum wire 8, and returning the upper pressing die 7 and the front pressing die 6 to the waiting position;

Step six, the left pressing die 4 and the right pressing die 5 push the anode core 10 to the blanking channel 11; the anode core 10 may also be pushed to the blanking channel 11 solely by the right die 5.

And step seven, repeating the step one to the step six, and completing the tantalum block forming work one by one.

Specifically, the left pressing die 4, the right pressing die 5, the front pressing die 6 and the upper pressing die 7 are respectively driven to move by driving mechanisms, and the driving mechanisms are linear modules or electric cylinders.

Compared with the prior art with the publication number of CN204035554U and the patent name of a tantalum block vertical processing equipment forming die, the application has the following differences:

The mold cavity in the prior art is practically formed by surrounding part of the hole wall on the middle mounting plate and the molding surface on the movable slide block. After the upper die and the lower die extrude tantalum powder, the tantalum block can expand outwards in the radial direction or the transverse direction to tightly attach to the inner wall of the die cavity, under the condition, even if the cylinder drives the movable sliding block to move backwards through the die cavity opening mechanism to enable the die cavity to be enlarged, the tantalum block still can be tightly attached to part of the hole wall on the middle mounting plate, so that the friction force between the tantalum block and the hole wall is still larger, when the lower die ejects the tantalum block out of the die cavity, the surface of the tantalum block is easy to scratch and the hole is damaged, and the consistency of the electrical performance parameters and the use reliability of the manufactured capacitor can be adversely affected.

In the application, different from the prior art, after the metal tantalum powder is pressed into the anode core 10 by the forming die, the upper die 7 and the front die 6 are retracted to the waiting position, so that the anode core 10 is in a loose state relative to the die body 2 and the limit stop 3, and therefore, in the process of pushing the anode core 10 to the blanking channel 11 by the left die 4 and the right die 5, the friction force between the anode core 10 and the forming die can be obviously reduced, thereby solving the problems of surface scratch and pore damage of the anode core 10 of the solid electrolytic capacitor, being beneficial to the lead-out of the capacitance of the anode core 10 and improving the consistency of the electrical parameters and the use reliability of the prepared solid electrolytic capacitor.

Claims (10)

1. A tantalum block forming die of a solid electrolytic capacitor is characterized in that: including mould base (1), mould body (2), limit stop (3), left moulding-die (4), right moulding-die (5), openly moulding-die (6) and last moulding-die (7), mould body (2) are established on base (1), constant head tank A (20) have been seted up to one side of mould body (2), and constant head tank B (21) have been seted up to the lower part of constant head tank A (20), limit stop (3) are established in constant head tank B (21), left moulding-die (4) with right moulding-die (5) symmetrical arrangement to all with constant head tank A (20) and limit stop (3) sliding connection, openly moulding-die (6) and mould body (2) sliding connection, and be located one side that is equipped with constant head tank A (20) on mould body (2), go up moulding-die (7) and be located directly over limit stop (3), correspond on mould body (2), openly moulding-die (6), limit stop (3) and base (1) and be equipped with blanking passageway (11).

2. The solid electrolytic capacitor tantalum piece forming die as claimed in claim 1, wherein: four slide bars (12) are arranged on one side, close to the front side pressing die (6), of the die body (2) side by side, the four slide bars (12) penetrate through the front side pressing die (6) and are in sliding connection with the front side pressing die (6), and two of the four slide bars (12) penetrate through the limit stop block (3).

3. The solid electrolytic capacitor tantalum piece forming die as claimed in claim 1, wherein: a blanking groove A (22) is vertically formed in the bottom surface of the positioning groove A (20) on the die body (2), and a blanking groove B (60) is vertically formed in the front face pressing die (6) at a position corresponding to the blanking groove A (22);

The lower side of the base (1) is provided with a tantalum block collecting box.

4. The solid electrolytic capacitor tantalum piece forming die as claimed in claim 1, wherein: the bottom surface of the positioning groove A (20) is a first side surface (9), the distance between the front pressing die (6) and the first side surface (9) in a die closing state is l ₁, and the distance between the front pressing die (6) and the first side surface (9) in a die opening state is l ₂ and l ₁＜l₂≤1.2l₁.

5. The solid electrolytic capacitor tantalum piece forming die as claimed in claim 4, wherein: the first side face (9), the limit stop (3), the left pressing die (4), the right pressing die (5), the front pressing die (6) and the upper pressing die (7) enclose a die cavity for pressing the tantalum block in a die assembly state.

6. The solid electrolytic capacitor tantalum piece forming die according to claim 5, wherein: the die cavity is cuboid or other polyhedrons.

7. The solid electrolytic capacitor tantalum piece forming die as claimed in claim 4, wherein: the limiting stop (3) is provided with a blanking groove C (30), and the width of the limiting stop (3) extending out of the positioning groove B (21) is d ₁ and l ₁＜d₁≤3l₁.

8. The solid electrolytic capacitor tantalum piece forming die as claimed in claim 4, wherein: the width of the die body (2) is d ₂ and 5l ₁＜d₂.

9. The solid electrolytic capacitor tantalum piece forming die as claimed in claim 1, wherein: and a through hole A (70) is vertically arranged on the upper pressing die (7).

10. A molding method of the solid electrolytic capacitor tantalum piece molding die according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:

Step one, clamping the left pressing die (4), the right pressing die (5) and the front pressing die (6) from a standby position, and forming a die cavity with an upper opening together with the die body (2) and the limit stop (3);

Filling metal tantalum powder into the die cavity;

step three, one end of a tantalum wire (8) passes through a through hole A (70) on an upper pressing die (7) and is inserted into metal tantalum powder in a die cavity, and then the upper pressing die (7) is downwards pressed on a die body (2) and a front pressing die (6) to seal the die cavity;

step four, the left pressing die (4) and the right pressing die (5) move a certain distance in the direction of approaching each other, and metal tantalum powder is extruded inwards to form an anode core (10);

cutting off the tantalum wire (8), and returning the upper pressing die (7) and the front pressing die (6) to a waiting machine position;

step six, pushing the anode core (10) to a blanking channel (11) by the left pressing die (4) and the right pressing die (5);

and step seven, repeating the step one to the step six, and completing the tantalum block forming work one by one.