Shell workpiece forging die capable of preventing material stacking

Abstract

The utility model discloses an anti-material-stacking shell workpiece forging die which comprises an upper die and a lower die which can be closed, an upper die core is connected to the upper die in a sliding mode, an elastic component is arranged between the upper die core and the upper die, side pressing blocks are arranged on the upper die and located on the periphery of the upper die core, a guide column and an ejector rod are arranged on the lower die, and the ejector rod is connected with the guide column. And the lower die is provided with a die groove for placing a prototype shell. Compared with the conventional one-step forging, the forging die has the advantages that the material stacking risk is greatly reduced, the subsequent process is not influenced, the forging quality of the shell can be improved, and the product percent of pass is improved; and for two-step forging, a die and a matched forging machine tool are saved, manpower and consumables are saved, and the forging cost is greatly saved.

Description

Technical Field

[0001] The utility model relates to the field of molds, and particularly to a forging mold for shell workpieces to prevent material overlapping. Background Art

[0002] In the 3C manufacturing industry, the competition is very fierce. Efficiency improvement and cost reduction are crucial for enterprises. Exploring the space for cost reduction and efficiency improvement from any aspect is conducive to obtaining greater profits. Among them, reducing the process is an important way. Saving a large amount of costs can be achieved from multiple dimensions related to supporting resources such as molds, machines, consumables, and labor. At the same time, the development cycle can be saved and the delivery cycle can be shortened.

[0003] Technically, in the forging process, too large a forging extrusion amount will cause poor folding and material overlapping of the material, which will affect other subsequent process steps. When it is necessary to ensure no material overlapping, the extrusion amount of the process should also be sufficient. Otherwise, the initial design effect cannot be achieved, and it may be necessary to increase the process, resulting in increased costs.

[0004] The usual forging method of a mobile phone structural part - a mobile phone case is to first make a prototype shell part with a shell structure from a metal material, and then press and forge the prototype shell part from top to bottom into a mobile phone case. During the forging process, because the material at the shell edge position around the prototype shell part is higher, the material at the shell edge around the prototype shell part will be extruded first, so the material at the shell edge around the prototype shell part will flow towards the middle first. When the mold is fully closed, that is, when the middle of the mold is also fully fitted, the material at the center shell bottom part is also stressed. When the material at the shell bottom part and the material at the shell edge are stressed simultaneously, there will be a risk of material overlapping at the corner between the shell bottom and the shell edge of the prototype shell part. If it is necessary to ensure no material overlapping, the conventional method is to split the forging extrusion amount from 1 step into 2 steps, resulting in an increased process and a longer process length, and higher costs. Content of the Utility Model

[0005] In view of this, the purpose of the present utility model is to propose a forging mold for shell workpieces to prevent material overlapping, solve the problem of material overlapping caused by excessive extrusion amount during the workpiece forging process, prevent the side wall filling from becoming thicker due to forging extrusion, and reduce the manufacturing cost.

[0006] To solve the above technical problems, the present utility model is implemented by adopting the following technical solutions:

[0007] A forging mold for shell workpieces to prevent material overlapping includes a closable upper mold and a lower mold. Among them, an upper mold core is slidably connected to the upper mold, and an elastic member (preferably a nitrogen spring) is provided between the upper mold core and the upper mold. Side pressing blocks are provided around the upper mold core on the upper mold. Guide posts and ejector rods are provided on the lower mold, and a mold groove for placing the prototype shell part is provided on the lower mold.

[0008] The upper die of the forging die moves downward driven by the forging machine. The upper die core first contacts the bottom of the prototype shell under the action of the nitrogen spring. The upper die core presses the bottom of the prototype shell. As the forging machine continues to move downward, the upper die and the lower die are closed. The side pressing blocks squeeze the shell edges around the prototype shell, forcing the shell edge material to flow. The upper die core presses the bottom of the prototype shell to prevent the shell edge material around from flowing towards the bottom, thus reducing the flow force of the material towards the bottom. The material can only fill the surrounding gaps between the upper die core, the side pressing blocks and the die cavity, thereby solving the problem of overlapping materials at the corner between the bottom and the shell edge.

[0009] The forging method of the forging die for the shell workpiece to prevent overlapping materials is as follows:

[0010] S1. Manufacture and process a prototype shell with a bottom and four shell edges;

[0011] S2. Form the shell product through one-step forging by the forging die;

[0012] S3. After the workpiece forging is completed, it is ejected by the ejector rod to complete the forging of the shell workpiece.

[0013] In the present utility model, the upper die includes an upper die head, an upper die connecting plate, and an upper die fixing plate. The upper die core slides downward on the upper die head under the push of the nitrogen spring. The bottom area of the upper die core is larger than the bottom area of the prototype shell, so that there is a space for material filling between the side of the upper die core and the side wall of the die cavity during forging; the width of the side pressing block is the same as the distance between the side of the upper die core and the side wall of the die cavity.

[0014] The upper die core is also connected with four equal-height sleeve structures. The equal-height sleeve structures are connected with the upper die connecting plate, and when the upper die core slides downward, they pull the upper die core to play a limiting role and limit the sliding height of the upper die core.

[0015] When the upper die and the lower die are closed, the space between the die cavity, the upper die core and the side pressing blocks is equal to the volume of the shell product, and the distance between the bottom surface of the upper die core and the bottom surface of the die cavity is equal to the thickness of the bottom of the prototype shell.

[0016] When the upper die and the lower die are closed, the distance between the side of the upper die core and the side wall of the die cavity is larger than the thickness of the shell edge of the prototype shell, so that after forging, the shell edge thickness of the shell product is larger than the shell edge thickness of the prototype shell.

[0017] The lower die includes a lower die head and a lower die cushion block. The guide post is arranged on the lower die head. The ejector rod passes through the lower die head and the lower die cushion plate, and the receiving groove of the ejector rod is communicated with the die cavity.

[0018] Principle of the present utility model: Through the force of the middle nitrogen spring, first slide the upper die core to the bottom, press down the upper die to press the bottom of the prototype shell part, and then drive the side pressing block to move downward by the pressure of the forging machine tool. After the upper die core first contacts the prototype shell part and presses the bottom tightly, the side pressing block then extrudes the shell edge of the prototype shell part, causing the shell edge material around to flow downward. Since the material at the bottom of the prototype shell part has been pressed by the upper die core and cannot flow to the bottom, and the bottom area of the upper die core is smaller than the bottom area of the prototype shell part, there is a gap between the side of the upper die core and the shell edge of the prototype shell part. Therefore, when forging, the shell edge material around the prototype shell part fills into these gaps, thus solving the problem of material stacking in conventional forging. Eventually, the shell edge of the forged shell will be extruded and thickened.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0020] Compared with the conventional one-step forging, the present utility model greatly reduces the risk of material stacking, does not affect the subsequent processes, can improve the forging quality of the shell, and improves the product qualification rate; for two-step forging, the present utility model saves the molds and the supporting forging machine tools, and saves manpower and consumables, greatly saving the forging cost. Brief Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the forging die of Embodiment 1 of the present utility model;

[0022] Figure 2 It is a schematic diagram of the mold closing state of the forging die of Embodiment 1 of the present utility model;

[0023] Figure 3 It is a schematic structural diagram of the prototype shell part of Embodiment 1 of the present utility model;

[0024] Figure 4 It is Figure 3 a schematic three-dimensional structural diagram.

[0025] In the figure: upper die 1, upper die head 101, upper die connecting plate 102, upper die fixing plate 103, upper die core 11, nitrogen spring 12, side pressing block 13, lower die 2, lower die head 201, lower die spacer 202, guide post 21, ejector rod 22, die cavity 23, prototype shell part 3, equal-height sleeve structure 4. Detailed Embodiment

[0026] To enable those skilled in the art to understand the present utility model more clearly and intuitively, the present utility model will be further described below in conjunction with the drawings.

[0027] Embodiment 1

[0028] As Figures 1-4As shown in the figure, this embodiment proposes a forging die for a metal mobile phone case. The forging die includes a closable upper die 1 and a lower die 2. Among them, an upper die core 11 is slidably connected to the upper die 1. A nitrogen spring 12 is provided between the upper die core 11 and the upper die 1. The upper die core 11 is also connected to four equal-height sleeve structures 4. The equal-height sleeve structures 4 are also connected to the upper die connecting plate 102. The equal-height sleeve structures 4 play a role in limiting the downward sliding of the upper die core 11, that is, when the nitrogen spring 12 jacks up the upper die core 11 and moves downward, the equal-height sleeve structures 4 pull the upper die core 11.

[0029] Side pressure blocks 13 are provided around the upper die core 11 on the upper die 1. Guide posts 21 and ejector rods 22 are provided on the lower die 2. And a die groove 23 for placing the prototype shell part 3 is provided on the lower die 2.

[0030] Specifically, the upper die 1 includes an upper die head 101, an upper die connecting plate 102, and an upper die fixing plate 103 from top to bottom. The upper die core 11 can slide downward on the upper die head 101 under the push of the nitrogen spring 12.

[0031] The lower die 2 includes a lower die head 201 and a lower die cushion block 202 from top to bottom. The guide posts 21 are provided on the lower die head 201. The ejector rods 22 pass through the lower die head 201 and the lower die cushion plate 202 in sequence. The receiving groove of the ejector rod 22 communicates with the die groove 23. When the upper die 1 and the lower die 2 are closed, the space between the die groove 23 and the upper die core 11 and the side pressure blocks 13 is equal to the volume of the shell product. And the distance between the bottom surface of the upper die core 11 and the bottom surface of the die groove 23 is equal to the shell bottom thickness of the prototype shell part 3. The distance between the side surface of the upper die core 11 and the side wall of the die groove 23 is greater than the shell edge thickness of the prototype shell part 3, so that after forging, the shell edge thickness of the shell product is greater than the shell edge thickness of the prototype shell part 3. In this embodiment, corresponding to the structural characteristics of the mobile phone case, the bottom area of the upper die core 11 is smaller than the shell bottom area of the prototype shell part 3 of the mobile phone case, and the width of the side pressure block 13 is the same as the distance between the side surface of the upper die core 11 and the side wall of the die groove 23; during forging, there is a space for material filling between the side surface of the upper die core 11 and the die groove 23.

[0032] Working principle: Through the force of the middle nitrogen spring 12, first slide the upper die core 11 until it is tightened by the equal-height sleeve structures 4. The upper die 1 presses down on the shell bottom of the prototype shell part 3, and then use the pressure of the forging machine tool to drive the upper die 1 and the side pressure blocks 13 to move downward. After the upper die core 11 first contacts the prototype shell part 3 and compresses the shell bottom, the side pressure blocks 13 then squeeze the shell edge of the prototype shell part 3, causing the surrounding shell edge material to flow downward. Since the material of the shell bottom of the prototype shell part 3 has been pressed by the upper die core 11 and the material cannot flow to the shell bottom, the surrounding shell edge material can only be filled into the gap between the die groove 23, the upper die core 11 and the side pressure blocks 13, thus solving the problem of overlapping materials in conventional forging. Finally, the shell edge of the forged shell product will have a greater thickness than the shell edge of the prototype shell part 3 due to forging and extrusion.

[0033] Example 2

[0034] A method for forging a housing workpiece using a forging die based on Example 1, comprising the following steps:

[0035] S1. Fabricate and machine a prototype shell part 3 with a shell bottom and four shell edges;

[0036] S2. Perform one-step forging through the forging die to form a housing product;

[0037] S3. After the workpiece forging is completed, eject it with the ejector rod 22 to complete the forging of the housing workpiece.

[0038] In step S2, the upper die 1 moves downward driven by the forging machine. The upper die core 11 first contacts the shell bottom of the prototype shell part 3 under the action of the nitrogen spring 12. The upper die core 11 presses the shell bottom of the prototype shell part 3. As the forging machine continues to move downward, the upper die 1 and the lower die 2 are closed. The side pressing block 13 extrudes the shell edges around the prototype shell part 3, forcing the shell edge material to flow. The upper die core 11 presses the shell bottom of the prototype shell part 3 to prevent the shell edge material around from flowing towards the shell bottom. Thus, the flow force of the material towards the shell bottom is reduced, and the material can only fill the surrounding gaps between the upper die core 11, the side pressing block 13 and the die cavity 23, thereby solving the problem of overlapping materials at the corner of the shell bottom and the shell edge.

[0039] The forging die and forging method of the present utility model have been greatly improved in terms of manpower, efficiency, resources, and the risk of overlapping materials. The specific comparison results are shown in Table 1.

[0040] Table 1

[0041]

[0042] One-step conventional forging is to forge and extrude a workpiece with a certain thickness in one working step, such as 5MM. If overlapping materials occur in the product, two-step conventional forging needs to be carried out, that is, forging and pressing through two working steps, 2.5MM for each step, and reaching 5MM in two steps of forging. Or first forge and extrude 3MM, and then forge and extrude 2MM. In addition, there can be other combinations, which are specifically adjusted according to the actual situation.

[0043] It can be seen from this that compared with conventional one-step forging, the risk of overlapping materials is greatly reduced, and it will not affect the subsequent processes, which can improve the forging quality of the housing and increase the product qualification rate; for two-step forging, the present utility model saves the die and the supporting forging machine tool, and saves manpower and consumables, greatly saving the forging cost.

[0044] The above description of the embodiments is provided to enable those of ordinary skill in the art to understand and apply the present utility model. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present utility model is not limited to the embodiments herein, and all improvements and modifications made by those skilled in the art to the present utility model according to the disclosure of the present utility model should fall within the protection scope of the present utility model.

Claims

1. A shell workpiece forging die for preventing material stacking, characterized in that: It includes a closable upper die and a lower die, wherein: An upper mold core is slidably connected to the upper mold, an elastic component is provided between the upper mold core and the upper mold, and side pressure blocks are provided on the upper mold around the upper mold core; The lower die is provided with a guide column and a push rod, and the lower die is provided with a die groove for placing the prototype shell part; The bottom area of ​​the upper die core is smaller than the bottom area of ​​the prototype shell part, so that there is a gap for material to flow in between the side surface of the upper die core and the shell edge of the prototype shell part during forging.

2. The shell workpiece forging die for preventing material stacking according to claim 1, characterized in that: The upper die comprises an upper die head, an upper die connecting plate and an upper die fixing plate in sequence from top to bottom.

3. The shell workpiece forging die for preventing material stacking according to claim 1, characterized in that: The elastic component is a nitrogen spring, and the upper mold core is pushed to slide by the nitrogen spring.

4. A shell workpiece forging die for preventing material stacking according to any one of claims 1 to 3, characterized in that: The lower die comprises a lower die head and a lower die pad from top to bottom, the guide column is arranged on the lower die head, the ejector rod passes through the lower die head and the lower die pad, and the receiving groove of the ejector rod is connected with the die groove.

5. The shell workpiece forging die for preventing material stacking according to claim 1, characterized in that: The width of the side pressing block is consistent with the distance between the side surface of the upper mold core and the side wall of the mold cavity.

6. The shell workpiece forging die for preventing material stacking according to claim 1, characterized in that: When the upper mold and the lower mold are closed, the space between the mold groove and the upper mold core and the side pressing block is equal to the volume of the shell product.

7. The shell workpiece forging die for preventing material stacking according to claim 5, characterized in that: The distance between the side surface of the upper die core and the side wall of the die groove is greater than the thickness of the shell edge of the prototype shell part, so that after forging, the shell edge thickness of the shell product is greater than the shell edge thickness of the prototype shell part.

8. The shell workpiece forging die for preventing material stacking according to claim 6, characterized in that: When the upper mold and the lower mold are closed, the distance between the bottom surface of the upper mold core and the bottom surface of the mold groove is equal to the shell bottom thickness of the prototype shell part.

9. The shell workpiece forging die for preventing material stacking according to claim 2, characterized in that: The upper mold core is also connected to four equal height sleeve structures, which are connected to the upper mold connecting plate and play a limiting role when the upper mold core slides down, limiting the sliding height of the upper mold core.

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