Reverse denting forming die capable of reducing scratch of pins

Abstract

The utility model discloses a reverse denting forming die capable of reducing scratch of a pin, and belongs to the technical field of forming and cutting. The die comprises a fixing and supporting mechanism, a bending and cutting mechanism and a limiting and positioning mechanism. The fixing and supporting mechanism comprises an upper die base, a female die fixing plate, a lower die base and a male die fixing plate. The bending and cutting-off mechanism comprises a material pressing plate, a material guiding cover plate, a bending male die, a bending female die, a cutting-off male die and a cutting-off female die. The limiting and positioning mechanism comprises a spring, a limiting column, a mold frame guide sleeve and a mold frame guide column. Compared with a downward denting mode of a traditional cutting forming die, the cutting forming die has the beneficial effects that an upward denting mode is adopted, pressing damage to a silver plating face in the production process is avoided, the product yield is increased, additional polishing treatment is carried out on the female die, friction between the tip end of a pin and the forming female die can be reduced while flatness of the product pin is guaranteed, and the product quality is improved. And the defective ratio of the product is reduced, the customer use is better met, and the cost is reduced.

Description

Technical Field

[0001] The present application belongs to the field of forming and cutting technology, and specifically relates to a reverse concave forming die for reducing pin scratches. Background Art

[0002] At present, discrete devices are widely used in the fields of computers and network communications, automotive electronics, LED displays, etc. Among them, discrete devices used in automotive electronics are generally high-power, which are called vehicle-mounted products. Among them, the PDFN series has gradually become a very commonly used packaging form due to its high power, small size and strong heat dissipation capacity. The lead frame is also an indispensable part of it as a carrier of the chip and a bridge connecting the external circuit. The PDFN series frame has the characteristics of strong heat dissipation capacity and no exposed pins. In general, when designing the frame, the pins need to be concave toward the silver-plated side. When the conventional concave silver surface is bent downward, it is easy to cause damage to the silver layer, which requires very high precision and has relatively low product production efficiency.

[0003] Therefore, it is necessary to provide a solution that can improve the quality of PDFN-type encapsulation frameworks to solve the above problems. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a reverse denting forming die for reducing pin scratches, which can solve at least one technical problem involved in the background technology.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] The embodiment of the present application provides a reverse concave forming die for reducing pin scratches, including a fixed support mechanism, a bending and cutting mechanism, and a limit positioning mechanism, wherein:

[0007] The fixed support mechanism includes an upper die seat, a die fixing plate, a lower die seat and a punch fixing plate, wherein the upper die seat is located above the lower die seat and is relatively spaced apart, the die fixing plate is arranged at the lower side of the upper die seat, and the punch fixing plate is arranged at the upper side of the lower die seat;

[0008] The bending and cutting mechanism comprises a material pressing plate, a material guiding cover plate, a bending punch, a bending die, a cutting punch and a cutting die, wherein the material pressing plate is located below the die fixing plate and is elastically connected to the upper die seat, the bending die is arranged at the lower side of the material pressing plate, the cutting punch is arranged in the bending die, the material guiding cover plate is arranged at the upper side of the die fixing plate, the bending punch is arranged on the die fixing plate and is arranged opposite to the bending die, and the cutting die is arranged on the material guiding cover plate and is arranged opposite to the cutting punch;

[0009] The limit positioning mechanism includes a spring, a limit column, a mold frame guide sleeve and a mold frame guide column. The pressure plate is elastically connected to the upper mold base through the spring. The limit column is arranged between the upper mold base and the lower mold base. The mold frame guide sleeve cooperates with the mold frame guide column and is arranged between the upper mold base and the lower mold base.

[0010] As a preferred improvement of the present utility model, the fixed support mechanism further includes a die pad, and the die fixing plate is fixed to the lower side of the upper die seat through the die pad.

[0011] As a preferred improvement of the present utility model, the fixed support mechanism further includes a punch pad, and the punch fixing plate is fixed to the upper side of the lower die base through the punch pad.

[0012] As a preferred improvement of the present invention, the limiting column includes an upper limiting column and a lower limiting column cooperating with the upper limiting column for limiting, the upper limiting column is fixed to the upper die base, and the lower limiting column is fixed to the lower die base.

[0013] As a preferred improvement of the present invention, the diameter of the mold frame guide column is 36 mm, and the diameter of the mold frame guide sleeve is 45 mm.

[0014] As a preferred improvement of the present invention, the thickness of the pressing plate is 25.5 mm, and the depth of the bending die is 0.2 mm.

[0015] As a preferred improvement of the present invention, the length of the bending punch is 15 mm.

[0016] As a preferred improvement of the utility model, the bending punches and the bending concave dies are arranged in 7 rows and 4 columns, and 28 products can be bent each time.

[0017] As a preferred improvement of the present invention, the bending and cutting mechanism further includes a guide pin arranged in the bending die.

[0018] Compared with the prior art, this application has the following beneficial effects:

[0019] 1. The mold is reversely concave-molded, and the male and female molds are inverted to form the mold. The rigid contact between the pin and the molding die is changed to flexible contact, which reduces the contact force and reduces the defective rate of the product.

[0020] 2. The die increases the avoidance angle, reduces the contact area between the pin and the die, and reduces the damage area of ​​the bent pin. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0022] Figure 1 A schematic diagram of the overall structure of a reverse concave forming die for reducing pin scratches provided by the utility model;

[0023] Figure 2 A planar arrangement diagram of a reverse concave forming die for reducing pin scratches provided by the utility model. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0026] See also Figure 1 and Figure 2 As shown, an embodiment of the present application provides a reverse denting forming die for reducing pin scratches, including a fixed support mechanism, a bending and cutting mechanism, and a limit positioning mechanism.

[0027] The fixed support mechanism comprises an upper die base 1, a die backing plate 2, a die fixing plate 3, a lower die base 4, a punch fixing plate 5 and a punch backing plate 6. The upper die base 1 is located above the lower die base 4 and is relatively spaced apart.

[0028] The die fixing plate 3 is fixed to the lower side of the upper die base 1 through the die backing plate 2 .

[0029] The punch fixing plate 5 is fixed to the upper side of the lower die base 4 through the punch backing plate 6 .

[0030] The bending and cutting mechanism includes a pressure plate 7, a guide pin 8, a guide cover plate 9, a bending punch 10, a bending die 11, a cutting punch 12 and a cutting die 13. The pressure plate 7 is located below the die fixing plate 3 and is elastically connected to the upper die base 1.

[0031] The guide pin 8 is arranged in the bending die 11 .

[0032] The bending die 11 is arranged at the lower side of the pressing plate 7 .

[0033] The cutting punch 12 is disposed in the bending die 11 .

[0034] The material guiding cover plate 9 is arranged on the upper side of the punch fixing plate 5 .

[0035] The bending punch 10 is disposed on the punch fixing plate 5 and is arranged opposite to the bending die 11 .

[0036] The cutting die 13 is disposed on the material guiding cover plate 9 and is arranged opposite to the cutting punch 12 .

[0037] In a specific embodiment, the thickness of the pressing plate 7 is 25.5 mm, the depth of the bending die 11 is 0.2 mm, and the length of the bending punch 10 is 15 mm.

[0038] The bending convex dies 10 and the bending concave dies 11 are arranged in 7 rows and 4 columns, and 28 products can be bent each time.

[0039] It should be noted that the bending die 11 adopts a polishing process to reduce the friction between the pin and the molding surface, ensuring that the silver layer in the pin functional area will not be scratched. Further, the bending die 11 increases the avoidance angle, reduces the contact area between the pin and the die, and reduces the damage area of ​​the bending molding pin.

[0040] The position limiting and positioning mechanism comprises a spring 14 , a position limiting column, a mold frame guide sleeve 16 and a mold frame guide column 17 , and the pressing plate 7 is elastically connected to the upper mold base 1 through the spring 14 .

[0041] The limiting column is configured between the upper die base 1 and the lower die base 4. Specifically, the limiting column includes an upper limiting column 151 and a lower limiting column 152 that cooperates with the upper limiting column 151 for limiting. The upper limiting column 151 is fixed to the upper die base 1, and the lower limiting column 152 is fixed to the lower die base 4.

[0042] The mold frame guide sleeve 16 cooperates with the mold frame guide column 17 and is disposed between the upper mold base 1 and the lower mold base 4. Specifically, the diameter of the mold frame guide column is 36 mm, and the diameter of the mold frame guide sleeve is 45 mm.

[0043] The working principle of the reverse concave forming die for reducing pin scratches provided by the utility model is as follows:

[0044] The lead frame is fed into the mold by the feeder and passes through the guide cover plate 9. When the frame is concave, the guide pins 8 limit the accurate positioning of the frame at each step to ensure the accuracy of the concave part. During the concave process, the bending punch 10 squeezes the frame from the position to be bent to the bending die 11. The bottom of the bending die ensures the flatness of the product pin. The pressure plate 7 ensures that after the mold is closed, the product is offset and deformed by force. The limit column 15 ensures the depth of the bending when concave. The mold frame guide column 17 and the mold frame guide sleeve 16 ensure that the mold is not offset or misaligned during production. After the product is bent, it is separated and formed by the cutting punch 12 and the cutting die 13.

[0045] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0046] In addition, it should be noted that the scope of the methods and systems in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. In addition, features described with reference to certain examples may be combined in other examples.

[0047] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A reverse concave forming die for reducing pin scratches, characterized in that: It includes a fixed support mechanism, a bending and cutting mechanism and a limit positioning mechanism, wherein: The fixed support mechanism includes an upper die seat, a die fixing plate, a lower die seat and a punch fixing plate, wherein the upper die seat is located above the lower die seat and is relatively spaced apart, the die fixing plate is arranged at the lower side of the upper die seat, and the punch fixing plate is arranged at the upper side of the lower die seat; The bending and cutting mechanism comprises a material pressing plate, a material guiding cover plate, a bending punch, a bending die, a cutting punch and a cutting die, wherein the material pressing plate is located below the die fixing plate and is elastically connected to the upper die seat, the bending die is arranged at the lower side of the material pressing plate, the cutting punch is arranged in the bending die, the material guiding cover plate is arranged at the upper side of the die fixing plate, the bending punch is arranged on the die fixing plate and is arranged opposite to the bending die, and the cutting die is arranged on the material guiding cover plate and is arranged opposite to the cutting punch; The limit positioning mechanism includes a spring, a limit column, a mold frame guide sleeve and a mold frame guide column. The pressure plate is elastically connected to the upper mold base through the spring. The limit column is arranged between the upper mold base and the lower mold base. The mold frame guide sleeve cooperates with the mold frame guide column and is arranged between the upper mold base and the lower mold base.

2. The reverse concave forming die for reducing pin scratches according to claim 1, characterized in that: The fixed support mechanism also includes a die pad, and the die fixing plate is fixed to the lower side of the upper die seat through the die pad.

3. The reverse concave forming die for reducing pin scratches according to claim 1 or 2, characterized in that: The fixed support mechanism also includes a punch pad, and the punch fixing plate is fixed to the upper side of the lower die seat through the punch pad.

4. The reverse concave forming die for reducing pin scratches according to claim 1, characterized in that: The limiting column comprises an upper limiting column and a lower limiting column cooperating with the upper limiting column for limiting, the upper limiting column is fixedly arranged on the upper die seat, and the lower limiting column is fixedly arranged on the lower die seat.

5. The reverse concave forming die for reducing pin scratches according to claim 1, characterized in that: The diameter of the mold frame guide column is 36 mm, and the diameter of the mold frame guide sleeve is 45 mm.

6. The reverse concave forming die for reducing pin scratches according to claim 1, characterized in that: The thickness of the pressing plate is 25.5 mm, and the depth of the bending die is 0.2 mm.

7. The reverse concave forming die for reducing pin scratches according to claim 1, characterized in that: The length of the bending punch is 15 mm.

8. The reverse concave forming die for reducing pin scratches according to claim 1, characterized in that: The bending punches and bending concave dies are arranged in 7 rows and 4 columns, and 28 products can be bent each time.

9. The reverse concave forming die for reducing pin scratches according to claim 1, characterized in that: The bending and cutting mechanism also includes a guide pin arranged in the bending die.

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