Stretching die for expanding end face of product

Abstract

The utility model discloses a drawing die for expanding the end face of a product, which comprises an upper die holder, an upper backing plate, an upper fixing plate, a stripping backing plate, a stripping plate, a lower die plate, a lower backing plate and a lower die holder which are sequentially arranged from top to bottom, a positioning die core is mounted on the lower die plate, an extrusion punch is mounted on the upper fixing plate and is of a cylindrical structure, and the lower die holder is provided with a lower backing plate and a lower backing plate. A positioning inner core is arranged in the extrusion punch, the extrusion punch is sleeved with a pressing block, the pressing block is fixed to the stripper plate, a limiting protrusion is arranged on the lower end face of the pressing block, and the limiting protrusion is an annular protrusion arranged in the circumferential direction of the pressing block. The extrusion punch has the advantages that the limiting protrusions are pressed into materials on the end face of a product, the materials on the end face of the product can be limited, when the materials on the end face of the product are extruded by the extrusion punch, the materials cannot flow outwards and can only flow towards the inner side of the end face of the product, the materials on the inner side become more, and the extruded end face becomes larger; and therefore, the expected drawing requirements of customers can be met, and the pseudo soldering problem is effectively solved.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically a stretching mold for expanding the end face of a product. Background Technology

[0002] As society develops and times progress, people's demands on all industries are becoming increasingly stringent. Improvements in quality, optimization of processes, and reductions in prices are forcing companies to seek change and actively engage in research and innovation to enhance their core competitiveness. The production requirements for the outer casings and shielding covers of smart products such as mobile phones, watches, and hearing aids are also becoming increasingly stringent, especially the requirements for the end faces of these shielding covers.

[0003] Commonly used shielding covers on the market include Figure 1-2 As shown: The end face of this shielding cover is located at the product's port, referred to in the industry as the end face. This port of the shielding cover needs to be soldered onto the circuit board. When the end face is too small, the contact area between the port and the circuit board is too small, occasionally resulting in cold solder joints and a low product yield. When the end face is larger, the contact area between the port and the circuit board also increases accordingly, and cold solder joints are almost non-existent.

[0004] In traditional stretching processes, the stretched end face is generally difficult to control, and the size of the product end face is often adjusted by extruding a flat surface. For example... Figure 3-4 As shown: A punch press drives the upper die downwards, initially positioning the product in place. As the punch press continues downwards, the positioning core carries the product into the die core. The punch press then closes, and the punch squeezes the material, causing it to flow inwards, thus forming a certain proportion of end face at the product's port. However, this structure has the following drawbacks: When the punch squeezes the material, the material flow is irregular. Because there is no external restraint on the material's surface, most of the material flows outwards, while a small portion flows inwards, resulting in an incomplete port and a relatively small end face. Therefore, when the stretched product's end face is soldered to the circuit board, the small end face makes it prone to poor soldering. Etching processes are also used to process the product's end face; however, etching relies on chemical corrosion, resulting in a noticeable yellowing or blackening of the finished product, affecting its appearance. Utility Model Content

[0005] The purpose of this invention is to provide a stretching mold for expanding the end face of a product, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a stretching mold for expanding the end face of a product, comprising, from top to bottom, an upper mold base, an upper pad, an upper fixing plate, a stripper pad, a stripper plate, a lower template, a lower pad, and a lower mold base. A positioning die core is installed on the lower template, and an extrusion punch is installed on the upper fixing plate. The extrusion punch has a cylindrical structure with a positioning inner core inside. A pressure block is sleeved on the outside of the extrusion punch. The pressure block is fixed to the stripper plate, and a limiting protrusion is provided on the lower end face of the pressure block. The limiting protrusion is an annular protrusion arranged along the circumference of the pressure block.

[0007] Further preferably, the cross-section of the limiting protrusion is trapezoidal and its lower base length is less than its upper base length, which facilitates the limiting protrusion being pressed into the end face material of the product to limit the end face material.

[0008] In a further preferred embodiment, the upper end of the extrusion punch is connected to a fixed base, which is installed inside the upper fixed plate. The extrusion punch, the positioning inner core, and the fixed base are fixed by a square pin. The fixed base enables the installation of the extrusion punch and the positioning inner core, and facilitates height adjustment. Installation and maintenance are simple and easy.

[0009] In a further preferred embodiment, the lower end of the positioning core is provided with a protruding step for positioning and supporting the inner cavity of the product; the lower end of the extrusion punch is pressed onto the step of the positioning core to ensure that the extrusion punch moves synchronously with the positioning core, and the material extruded by the extrusion punch will not enter between the extrusion punch and the positioning core.

[0010] In a further preferred embodiment, the upper end of the pressure block is provided with a boss, and the side of the pressure block and below the boss is provided with a groove. The boss is used to limit the installation of the pressure block, and the groove is used to ensure that the installation of the pressure block is accurate and will not be affected by the boss.

[0011] In a further preferred embodiment, a stripper block is movably inserted into the cavity of the positioning mold core. A transfer pin is connected to the lower end of the stripper block, which passes downwards through a lower pad and is connected to a spring. The spring is installed inside the lower mold base. The stripper block supports the bottom of the product and ejects the product from the cavity of the positioning mold core after the mold opens. The spring provides an upward force to the transfer pin, which is transmitted to the stripper block, ensuring that the stripper block always has an upward pushing force.

[0012] Further preferably, the cavity of the positioning mold core is a stepped hole, with the size of the lower hole being larger than that of the upper hole, which facilitates the installation of the stripper block.

[0013] In a further preferred embodiment, there is a gap between the fixed seat and the upper pad, and a number of shims are provided in the gap between the fixed seat and the upper pad. The height position of the fixed seat can be adjusted by increasing or decreasing the number of shims, thereby realizing the adjustment of the installation position of the extrusion punch and the positioning die connected to the fixed seat.

[0014] Beneficial effects: This utility model of a stretching die for expanding the end face of a product, by setting a limiting protrusion below the pressure block, presses into the material at the end face of the product, thus limiting the material at the end face. This prevents the material from flowing outward when squeezed by the extrusion punch, allowing it to flow only inward. More material inward results in a larger end face, meeting the customer's expected drawing requirements and solving the problem of incomplete welding. By fixing the extrusion punch to the upper fixed plate, the initial force of the extrusion punch is provided by the punch press, ensuring sufficient extrusion force. This results in a very uniform and highly stable end face of the product. Adjusting the size of the end face of the stretched product using this stretching die is simple; only shims need to be added or removed from the fixed base. The operation is quick and convenient, significantly improving die repair efficiency. The stretching die has a simple structure, is easy to implement, and the finished product produced by the stamping process does not yellow or blacken, resulting in a more aesthetically pleasing appearance. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of the outer shell shielding cover disclosed in the background art of this utility model;

[0016] Figure 2 This is a cross-sectional structural diagram of the shielding cover disclosed in the background art of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of a conventional end-face stretching die disclosed in the background art of this utility model;

[0018] Figure 4 for Figure 3 Enlarged structural diagram at point A;

[0019] Figure 5 This is a schematic diagram of the structure of a stretching mold for expanding the end face of a product, as disclosed in an embodiment of this utility model.

[0020] Figure 6 for Figure 5 Enlarged structural diagram at point B;

[0021] Figure 7 for Figure 5 Enlarged structural diagram at point C;

[0022] Figure 8 for Figure 5 A magnified structural diagram at point D.

[0023] Reference numerals: 1-Upper mold base, 2-Upper pad, 3-Upper fixing plate, 4-Stripping pad, 5-Stripping plate, 6-Lower template, 7-Lower pad, 8-Lower mold base, 9-Extrusion punch, 10-Positioning core, 11-Pressure block, 111-Limiting protrusion, 112-Boss, 113-Groove, 12-Fixed base, 13-Square pin, 14-Positioning mold core, 15-Stripping block, 16-Transfer pin, 17-Spring, 18-Product. Detailed Implementation

[0024] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0025] like Figure 5-8 As shown, a stretching mold for expanding the end face of a product is used to stretch the end face of a product 18, such as a microphone or a micro sensor housing, to expand the end face of the product 18, which facilitates the soldering of the product 18 on a circuit board, effectively prevents the occurrence of cold solder joints in the product 18, and ensures the soldering quality of the product 18. The stretching die includes, from top to bottom, an upper die base 1, an upper pad 2, an upper fixed plate 3, a stripper pad 4, a stripper plate 5, a lower die plate 6, a lower pad 7, and a lower die base 8. A positioning die core 14 is installed on the lower die plate 6, and an extrusion punch 9 is installed on the upper fixed plate 3. The extrusion punch 9 has a cylindrical structure with a positioning inner core 10 inside and a pressure block 11 sleeved on the outside of the extrusion punch 9. The upper die base 1, upper pad 2, upper fixed plate 3, stripper pad 4, stripper plate 5, extrusion punch 9, positioning inner core 10, and pressure block 11 form the upper die structure, and the lower die plate 6, lower pad 7, lower die base 8, and positioning die core 14 form the lower die structure. The positioning inner core 10 positions and supports the inner cavity of the product 18, and the end face of the product 18 is stretched by the stamping punch 9 and the positioning die core 14, thereby expanding the end face of the product 18. The pressure block 11 is fixed to the stripper plate 5 and can move synchronously with the stripper plate 5 to position and fix the product 18. The pressure block 11 is pressed into the material of the product 18 by a limiting protrusion 111 on its lower end face, limiting the material outside the limiting protrusion 111. This prevents the material on the end face of the product 18 from flowing outwards when the extrusion punch 9 stretches the product 18, ensuring that the material on the end face of the product 18 can only flow inwards. This increases the amount of material on the inner side, allowing the extrusion punch 9 to extrude a larger area on the end face of the product 18, thus expanding the end face of the product 18. The limiting protrusion 111 is an annular protrusion along the circumference of the pressure block 11, effectively limiting the flow direction of the material on the end face of the product 18.

[0026] In this application, the extrusion punch 9 is fixed on the upper fixed plate 3 and connected to the punch press via the upper pad 2 and the upper die holder 1. The initial force of the extrusion punch 9 is provided by the punch press, which has a very strong force that is incomparable to that of a spring, ensuring sufficient extrusion force for the extruded material. This, in turn, ensures that the end face of the punched product 18 is very uniform and has high stability. Furthermore, by adding a limiting protrusion 111 to the lower end face of the pressure block 11, the flow direction of the end face material of the product 18 can be limited and controlled, which can increase the end face of the product 18. The structure is simple and the operation is convenient.

[0027] In this application, the limiting protrusion 111 has a trapezoidal cross-section with its lower base length shorter than its upper base length, which allows it to be pressed more forcefully into the end face material of the product 18, ensuring the flow direction of the material on the end face of the product 18 is limited. Furthermore, the cross-section of the limiting protrusion 111 is not limited to a trapezoidal structure; it can also be a triangular structure, as long as it is more conducive to pressing into the end face material of the product 18.

[0028] In this application, a fixed seat 12 is connected to the upper end of the extrusion punch 9. The fixed seat 12 is installed inside the upper fixed plate 3, and the extrusion punch 9, the positioning inner core 10, and the fixed seat 12 are fixed by a square pin 13. The fixed seat 12 enables the installation and fixation of the extrusion punch 9 and the positioning inner core 10, and facilitates disassembly, maintenance, and replacement. Simultaneously, by adjusting the height of the fixed seat 12 relative to the upper fixed part 3, the height of the extrusion punch 9 and the positioning inner core 10 relative to the upper fixed plate 3 can be adjusted, satisfying the stamping adjustment for different end face sizes. Based on this design, there is a gap between the fixed seat 12 and the upper pad 2, and several shims are provided in the gap. By increasing or decreasing the number of shims, the height adjustment of the fixed seat 12 relative to the upper fixed plate 3 can be achieved. This operation is quick and convenient, and facilitates mold repair with high efficiency.

[0029] In this application, the lower end of the positioning core 10 is provided with a protruding step for insertion into the inner cavity of the product 18, thereby providing internal support and positioning for the product 18. The outer dimensions of the step of the positioning core 10 are 0.01 mm smaller than the inner cavity dimension of the product 18, while the inner cavity dimension of the positioning die core 14 is 0.01 mm larger than the inner cavity dimension of the product 18. The lower end of the extrusion punch 9 is pressed onto the step of the positioning core 10 to ensure synchronous operation between the extrusion punch 9 and the positioning core 10. After the lower step of the positioning core 10 enters the inner cavity of the product 18, the extrusion punch 9 then stamps the end face of the product 18.

[0030] In the solution of this application, a boss 112 is provided on the upper end side of the pressure block 11 for limiting the installation of the pressure block 11 on the stripping plate 5; a groove 113 is provided on the side of the pressure block 11 and below the boss 112. The groove 113 facilitates the installation of the pressure block 11 on the stripping plate 5 and will not be affected by the boss 112, resulting in improper installation.

[0031] In this application, a stripper block 15 is movably inserted into the cavity of the positioning mold core 14. A transfer pin 16 is connected to the lower end of the stripper block 15. The transfer pin 16 passes downward through the lower pad 7 and is connected to a spring 17, which is installed inside the lower mold base 8. The stripper block 15 is used for stripping the product 18. It is in clearance fit with the positioning mold core 14. The spring 17 provides an upward pushing force to the transfer pin 16, ensuring that the stripper block 15 always has an upward pushing force. When the mold is closed, the stripper block 15, under the action of the pushing force, always supports the bottom of the product 18, ensuring the stability of the product 18 during stretching and guaranteeing the stretching quality of the product 18. It can also adapt to stretching operations of products 18 with different stretching depths. When the mold is opened, the stripper block 15, under the action of the pushing force, pushes the stretched product 18 out of the cavity of the positioning mold core 14, thus stripping the product 18.

[0032] Based on the above scheme, the cavity of the positioning mold core 14 is a stepped hole, with the size of the lower hole being larger than that of the upper hole, which facilitates the up-and-down movement of the stripper block 15 within the cavity of the positioning mold core 14 and makes it convenient to install the stripper block 15 into the cavity of the positioning mold core 14.

[0033] In this application, the working process of the stretching die is as follows: In the open state, the extrusion punch 9 and the positioning core 10 are retracted into the pressure block 11; the die begins to close, and the upper die base 1, upper pad 2, upper fixing plate 3, stripper pad 4, stripper plate 5, extrusion punch 9, positioning core 10 and pressure block 11 form the upper die structure, which begins to move downward under the action of the punch press. The limiting protrusion 111 on the lower end face of the pressure block 11 first contacts the end face of the product 18, and as the upper die structure continues to move downward, the limiting protrusion 111 presses the product 18 onto the positioning die core 14, and the limiting protrusion 111 is pressed into the material on the end face of the product 18; the upper die structure continues to move downward, the positioning core 10 enters the inner cavity of the product 18, and then the extrusion punch 9 extrudes the material on the end face of the product 18 until the die is completely closed. Since the limiting protrusion 111 first limits the end face material of the product 18 located on its outer side, the extrusion punch 9 then compresses the end face material of the product 18. Since the volume of the end face material is constant, the material can only flow to the inside of the product. As the material inside increases, the end face pressed out by the extrusion punch 9 becomes larger.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A stretching mold for expanding the end face of a product, comprising, from top to bottom, an upper mold base (1), an upper pad (2), an upper fixing plate (3), a stripper pad (4), a stripper plate (5), a lower template (6), a lower pad (7), and a lower mold base (8), wherein a positioning mold core (14) is mounted on the lower template (6), characterized in that: An extrusion punch (9) is installed on the upper fixed plate (3). The extrusion punch (9) is a cylindrical structure with a positioning core (10) inside. A pressure block (11) is sleeved on the outside of the extrusion punch (9). The pressure block (11) is fixed on the stripper plate (5). A limiting protrusion (111) is provided on the lower end face of the pressure block (11). The limiting protrusion (111) is an annular protrusion arranged along the circumference of the pressure block (11).

2. The stretching die for expanding the end face of a product according to claim 1, characterized in that: The cross-section of the limiting protrusion (111) is trapezoidal and its lower base length is less than its upper base length.

3. A stretching die for expanding the end face of a product according to claim 1, characterized in that: The upper end of the extrusion punch (9) is connected to a fixed seat (12), which is installed in the upper fixed plate (3). The extrusion punch (9), the positioning inner core (10) and the fixed seat (12) are fixed by a square pin (13).

4. A stretching die for expanding the end face of a product according to claim 1, characterized in that: The lower end of the positioning core (10) is provided with a protruding step, and the lower end of the extrusion punch (9) is pressed onto the step of the positioning core (10).

5. A stretching die for expanding the end face of a product according to claim 1, characterized in that: The upper end side of the pressure block (11) is provided with a boss (112), and the side of the pressure block (11) and below the boss (112) is provided with a groove (113).

6. A stretching die for expanding the end face of a product according to claim 1, characterized in that: A stripper block (15) is movably inserted into the cavity of the positioning mold core (14). A transfer pin (16) is connected to the lower end of the stripper block (15). The transfer pin (16) passes downward through the lower pad plate (7) and is connected to a spring (17). The spring (17) is installed inside the lower mold base (8).

7. A stretching die for expanding the end face of a product according to claim 6, characterized in that: The cavity of the positioning mold core (14) is a stepped hole, with the size of the lower hole being larger than that of the upper hole.

8. A stretching die for expanding the end face of a product according to claim 3, characterized in that: There is a gap between the fixed seat (12) and the upper pad (2), and a number of pads are provided in the gap between the fixed seat (12) and the upper pad (2).

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