Bending die for mobile phone frame machining

Abstract

The utility model discloses a bending die for mobile phone frame processing, which comprises an upper die and a lower die, the lower side of the upper die is provided with a punch structure, the punch structure comprises a fixed block and movable blocks, the two sides of the fixed block are respectively connected with the movable blocks in a sliding mode, a sliding inclined plane is arranged between the movable blocks and the fixed block, and the sliding inclined plane is provided with a sliding groove. The movable block slides relative to the fixed block according to the guide direction of the sliding inclined surface, so that the punch structure expands or contracts in the transverse direction; an ejector pin for pushing the moving block to move downwards is further arranged in the upper die and pushes the moving block to move downwards to enable the two sides of the fixed block to contract; according to the bending die for machining the mobile phone frame, the deformable punch structure is arranged, the movable block is pushed to move downwards through the ejector pin during die opening, the movable block is guided by the sliding inclined face while moving downwards, and then relative shrinkage movement is formed, so that the distance between the die and a workpiece can be increased during die opening, and the machining efficiency is improved. And meanwhile, the defect that the die rubs the surface of the workpiece to cause scratches is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of stamping dies, in particular to a bending die for processing a mobile phone frame. Background Art

[0002] Traditional mobile phone cases are mostly made of aluminum alloy. With the advent of the 5G era and the increasing demand for the aesthetics of mobile phones, aluminum metal can no longer meet the functional design requirements of mobile phones and the psychological needs of consumers due to factors such as interference with signals and poor texture. Therefore, a new alternative material must be sought to manufacture mobile phone cases. Titanium alloy has the characteristics of high specific strength, biophilia, good sound permeability and good metallic texture, and it also symbolizes high-end and atmospheric identity characteristics, so it has become the most important metal material used for mobile phone cases in the 5G era.

[0003] The mobile phone frame has small specifications and high dimensional accuracy. From the manufacturing process route, the mobile phone frame can usually be directly CNC processed by plate. The whole piece of metal is directly milled into the mobile phone frame by CNC. Although it has high processing accuracy, this method has low production efficiency, high material waste, high tool wear and high processing costs, which in turn raises the overall cost of the mobile phone and compresses the profit margin.

[0004] As disclosed in application number: CN202280000261.6, a mobile phone frame and a manufacturing method thereof, the mobile phone frame comprises a composite plate (25), the composite plate (25) encloses a storage space for accommodating a mobile phone, the composite plate (25) comprises a first plate body (5) and a second plate body (16), a first side surface of at least one of the first plate body (5) and the second plate body (16) is formed with stripes, and the first side surface of the second plate body (16) is rolled and connected to the first side surface of the first plate body (5).

[0005] The U-shaped mobile phone frame as described above is processed, and then two symmetrical mobile phone frames are used to combine into the frame around the mobile phone; the above-mentioned U-shaped mobile phone frame is more suitable for direct forming by a bending mold, but ordinary bending molds cannot guarantee the accuracy of the bending position; secondly, due to the high dimensional accuracy requirements of the mobile phone frame, it is inevitable that the gap between the mold and the workpiece is small during stamping and forming by ordinary bending molds, which easily leads to mold jamming when opening the mold; in addition, due to the high dimensional accuracy requirements, the mold fits the workpiece tightly, and the mold is easy to scratch the side wall of the formed mobile phone frame when opening the mold, and the mold itself will also be greatly worn after long-term use.

[0006] In view of the above, it is necessary to propose a bending mold for processing a mobile phone frame to solve the above problems. Utility Model Content

[0007] The purpose of the utility model is to solve the above technical problems and provide a bending mold for processing a mobile phone frame.

[0008] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a bending mold for processing a mobile phone frame, comprising an upper mold and a lower mold, a punch structure is arranged on the lower side of the upper mold, the punch structure comprises a fixed block and a moving block, the two sides of the fixed block are respectively slidably connected with moving blocks, a sliding slope is arranged between the moving block and the fixed block, the moving block slides relative to the fixed block according to the guiding direction of the sliding slope so that the punch structure expands or contracts in the lateral direction; a pin for pushing the moving block downward is also arranged in the upper mold, and the pin pushes the moving block downward so that the two sides of the fixed block contract;

[0009] A part positioning groove is arranged in the lower mold, and the part positioning groove includes a mold block arranged in the middle and controlled to rise and fall relative to the lower mold; a lower groove is arranged in the middle of the upper side of the lower mold, and both sides of the lower groove are forming side walls for workpiece bending processing.

[0010] Furthermore, the fixed block is an inverted trapezoidal boss, symmetrical sliding slopes are provided on both sides of the fixed block, and a guide groove is provided in the middle of the sliding slope; the movable block is provided with a matching slope on the side that is in contact with the sliding slope, and a guide ridge is provided in the middle of the matching slope, and the guide ridge is slidably arranged in the guide groove.

[0011] Furthermore, a detachable and replaceable forming block is provided on the outer side of the lower end of the moving block, a through groove is provided on the moving block for laterally inserting the forming block, the forming block is provided with an insert block inserted into the through groove, and a clamping bolt is provided near the through groove of the moving block, and the clamping bolts on both sides clamp the insert block and limit it in the through groove.

[0012] Furthermore, the upper mold includes an upper pressing plate, on which a push hole is provided at a position corresponding to the moving block, an ejector pin is slidably provided in the push hole, and the lower end surface of the ejector pin pushes against the upper end surface of the moving block.

[0013] Furthermore, the lower groove is internally recessed with a receiving groove for the mold block to move up and down, and the bottom of the receiving groove is provided with a pushing chamber for placing a lifting cylinder.

[0014] Furthermore, the part positioning groove includes an end positioning plate, and the end positioning plate is provided on both sides of the lower groove. The two positioning plates are used to position the ends of the placed workpieces, and positioning notches are provided on one side of the two positioning plates close to each other.

[0015] Furthermore, a cavity for forming a workpiece is provided on the forming side wall of the lower groove, and the cavity includes an inclined cavity and a vertical cavity; a roller is provided at the transition point between the inclined cavity and the vertical cavity.

[0016] Furthermore, the roller shaft is arranged on both sides of the lower groove of the lower mold, and the lower mold is provided with an axial hole for the roller shaft to pass through. The lower part of the axial hole away from the lower groove is connected to a fan-shaped cavity, and a plurality of rollers are arranged in the fan-shaped cavity, and the rollers are arranged parallel to the roller shaft.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model is a bending mold for processing a mobile phone frame, which is provided with a deformable punch structure. When the mold is opened, the movable block is pushed downward by the ejector pin. While moving downward, it is guided by the sliding slope, thereby forming a relatively contracting movement, so that the distance between the mold and the workpiece can be increased when the mold is opened, and at the same time, the disadvantage of scratches caused by the mold rubbing against the workpiece surface is avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is an axonometric diagram of a bending die for processing a mobile phone frame according to the utility model;

[0019] Figure 2 This is a schematic diagram of the internal cross section of a bending mold for processing a mobile phone frame according to the utility model. Figure 1 ;

[0020] Figure 3 This is a schematic diagram of the internal cross section of a bending mold for processing a mobile phone frame according to the utility model. Figure 2 ;

[0021] Figure 4 This is an exploded view of the upper mold of the utility model;

[0022] Figure 5 This is an exploded view of the lower mold of the utility model;

[0023] In the figure: 1. upper mold; 2. lower mold; 3. punch structure; 4. fixed block; 5. moving block; 6. sliding slope; 7. ejector pin; 8. part positioning groove; 9. mold block; 10. lower groove; 11. forming side wall; 12. guide groove; 13. matching slope; 14. guide ridge; 15. forming block; 16. through groove; 17. insert block; 18. clamping bolt; 19. upper pressure plate; 20. ejection hole; 21. accommodating groove; 22. ejection chamber; 23. end positioning plate; 24. positioning notch; 25. cavity; 26. inclined cavity; 27. vertical cavity; 28. roller; 29. ​​shaft hole; 30. fan-shaped cavity; 31. roller; 32. workpiece. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0025] A bending die for processing a mobile phone frame, such as Figure 1 As shown, it includes an upper mold 1 and a lower mold 2; when the molds are closed, the upper mold 1 is punched into the lower mold 2, and then the workpiece 32 placed and fixed between the two molds is bent according to the cavity 25 when the molds are closed, and a punch structure 3 is provided on the lower side of the upper mold 1, and a lower groove 10 corresponding to the punch structure 3 is provided in the lower mold 2. The punch is inserted into the lower groove 10, so that the two ends of the workpiece 32 are bent on the molding side walls 11 on both sides of the lower groove 10.

[0026] Different from the prior art, the punch structure 3 in the present device includes a fixed block 4 and a movable block 5, and the movable blocks 5 are respectively slidably connected on both sides of the fixed block 4, and a sliding slope 6 is provided between the movable block 5 and the fixed block 4. The movable block 5 slides relative to the fixed block 4 according to the guide direction of the sliding slope 6 to make the punch structure 3 expand or contract in the lateral direction; in actual use, under the pressure of the upper pressing plate 19, the fixed block 4 and the movable block 5 are pressed together on the upper surface of the workpiece 32 to shape it. When the mold is opened, the movable block 5 is moved downward, and then under the action of the sliding slope 6, the movable blocks 5 on both sides can move a certain distance close to each other. Specifically, the upper mold 1 is further provided with a pin 7 for pushing the movable block 5 downward, and the pin 7 pushes the movable block 5 downward to cause the two sides of the fixed block 4 to contract; specifically, the fixed block 4 is an inverted trapezoidal boss, and symmetrical sliding slopes 6 are provided on both sides of the fixed block 4, and a guide groove 12 is provided in the middle of the sliding slope 6; the movable block 5 is provided with a matching slope 13 on the side that is in contact with the sliding slope 6, and a guide ridge 14 is provided in the middle of the matching slope 13, and the guide ridge 14 is slidably arranged in the guide groove 12.

[0027] When opening the mold, firstly, force is applied to the upper end of the ejector pin 7 to support the moving block 5; at this time, the upper mold 1 is controlled to move upward, and under the action of the ejector pin 7, the fixed block 4 is first lifted a certain distance, so that the moving blocks 5 on both sides are brought closer to each other through the relative movement of the sliding inclined surface 6 and the matching inclined surface 13, so that the distance between the moving block 5 and the workpiece 32 is increased, and then as the upper mold 1 is lifted, the moving blocks 5 on both sides are pulled out.

[0028] Specifically, Figure 2-4 As shown, the upper mold 1 includes an upper pressing plate 19, and a push hole 20 is provided on the upper pressing plate 19 at a position corresponding to the moving block 5. An ejector pin 7 is slidably provided in the push hole 20, and the lower end surface of the ejector pin 7 pushes against the upper end surface of the moving block 5. When the upper mold 1 is pressed down to close the mold, the moving block 5 pushes the ejector pin 7 upward for a certain distance. When the mold is opened, the driving force is used to push the ejector pin 7 downward from the push hole 20 to make it fall to the bottom, so that the moving blocks 5 on both sides can be controlled to close to each other and shrink by a certain distance, thereby facilitating the mold opening and preventing the punch structure 3 from scratching the surface of the workpiece 32.

[0029] The outer side of the lower end of the moving block 5 is provided with a detachable and replaceable forming block 15, such as Figure 4 As shown, the forming block 15 is the most easily worn component during long-term use. It is designed to be easy to replace. After wear, it can be easily replaced. In addition, since the bending tool of the mobile phone frame has different curvature requirements at the bending part, the device can process workpieces 32 with different curvatures by using forming blocks 15 with different curvatures. The fixing method is as follows: the moving block 5 is provided with a through groove 16 for the forming block 15 to be inserted laterally, the forming block 15 is provided with an insert block 17 inserted into the through groove 16, and the moving block 5 is provided with a clamping bolt 18 near the through groove 16. The clamping bolts 18 on both sides clamp the insert block 17 in the through groove 16. Figure 4 As shown, the inserting block 17 of the forming block 15 is correspondingly inserted into the through slot 16, and then the forming block 15 is fixed with the clamping bolts 18 on both sides.

[0030] Specifically, Figure 1 , 5 As shown, the lower mold 2 is provided with a part positioning groove 8, and the part positioning groove 8 includes a mold block 9 arranged in the middle and controlled to rise and fall relative to the lower mold 2; a lower groove 10 is provided in the middle of the upper side of the lower mold 2, and the two sides of the lower groove 10 are forming side walls 11 for bending the workpiece 32. Figure 3 As shown, before processing the workpiece 32, the mold block 9 is first controlled to move upward, and the mold block 9 and the end positioning plates 23 at both ends can form a part positioning groove 8 for positioning the workpiece 32, and the workpiece 32 can be placed in the part positioning groove 8; a positioning notch 24 is provided on the end positioning plate 23, which is convenient for limiting the end of the workpiece 32, so as to improve the processing accuracy;

[0031] During actual processing, the mold block 9 is first lifted from the receiving groove 21 and aligned with the end positioning plates 23 on both sides, and then the workpiece 32 is placed in the part positioning groove 8; the lower groove 10 is recessed with a receiving groove 21 for the mold block 9 to move up and down, and the bottom of the receiving groove 21 is provided with a push chamber 22 for placing a lifting cylinder. Figure 2 , 3 As shown, when the upper die 1 is controlled to be pressed downward, the punch structure 3 and the die block 9 form a clamping and positioning for the workpiece 32, so that when the pressing continues, the lateral movement of the workpiece 32 can be avoided, thereby improving the processing accuracy.

[0032] Furthermore, the part positioning groove 8 includes an end positioning plate 23, which is provided on both sides of the lower groove 10. The two positioning plates are used to position the ends of the placed workpiece 32, and the two positioning plates are provided with a positioning notch 24 on one side close to each other. Before the workpiece 32 is stamped and formed, it is in a straight line shape, and the two ends of the workpiece 32 can be pressed into the positioning notches 24 of the end positioning plates 23 on both sides to form a precise positioning.

[0033] The molding side wall 11 of the lower groove 10 is provided with a molding cavity 25 for molding the workpiece 32. Figure 3 As shown, the mold cavity 25 includes an inclined cavity 26 and a vertical cavity 27; a roller 28 is provided at the transition point between the inclined cavity 26 and the vertical cavity 27. During stamping, as the workpiece 32 is pressed and moved downward, the two ends of the workpiece 32 are first deformed and fit on the inclined cavity 26. At this time, the deformation amplitude is not large. In the subsequent stamping process, the deformation of the workpiece 32 increases, so that the workpiece 32 is deformed into a vertical shape, and it can be formed by the vertical cavity 27. At the transition point between the inclined cavity 26 and the vertical cavity 27, in order to prevent the workpiece 32 from being scratched by the friction surface, a roller 28 is provided. When the workpiece 32 is deformed, the sliding friction is converted into rolling friction by the roller 28, so that the surface of the workpiece 32 can be better protected. In addition, it can be bent more easily, effectively improving the processing quality.

[0034] Specifically, the roller shaft 28 is arranged through both sides of the lower groove 10 of the lower mold 2, and the lower mold 2 is provided with an axis hole 29 for the roller shaft 28 to pass through. Figure 5 As shown, a fan-shaped cavity 30 is connected to the lower part of the shaft hole 29 away from the lower groove 10, and a plurality of rollers 31 are arranged in the fan-shaped cavity 30, and the rollers 31 are arranged parallel to the roller shaft 28. In order to make it easier for the roller shaft 28 to rotate in the shaft hole 29, by providing a plurality of rollers 31, the sliding friction between the roller shaft 28 and the inner wall of the shaft hole 29 is changed into rolling friction, thereby reducing the contact area and making the roller shaft 28 easier to rotate.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A bending mold for processing a mobile phone frame, comprising an upper mold (1) and a lower mold (2), characterized in that: A punch structure (3) is provided on the lower side of the upper mold (1), and the punch structure (3) comprises a fixed block (4) and a movable block (5). The movable blocks (5) are slidably connected to the two sides of the fixed block (4), and a sliding slope (6) is provided between the movable block (5) and the fixed block (4). The movable block (5) slides relative to the fixed block (4) according to the guiding direction of the sliding slope (6) so that the punch structure (3) expands or contracts in the transverse direction. A pin (7) for pushing the movable block (5) downward is also provided in the upper mold (1), and the pin (7) pushes the movable block (5) downward so that the two sides of the fixed block (4) contract. A part positioning groove (8) is provided in the lower mold (2), and the part positioning groove (8) includes a mold block (9) arranged in the middle and controlled to rise and fall relative to the lower mold (2); a lower groove (10) is provided in the middle of the upper side of the lower mold (2), and both sides of the lower groove (10) are forming side walls (11) for bending the workpiece (32).

2. A bending mold for processing a mobile phone frame according to claim 1, characterized in that: The fixed block (4) is an inverted trapezoidal boss, and symmetrical sliding slopes (6) are provided on both sides of the fixed block (4), and a guide groove (12) is provided in the middle of the sliding slope (6); the movable block (5) is provided with a matching slope (13) on the side in contact with the sliding slope (6), and a guide ridge (14) is provided in the middle of the matching slope (13), and the guide ridge (14) is slidably arranged in the guide groove (12).

3. A bending mold for processing a mobile phone frame according to claim 1, characterized in that: A detachable and replaceable forming block (15) is provided on the outer side of the lower end of the moving block (5); a through groove (16) is provided on the moving block (5) for the lateral insertion of the forming block (15); the forming block (15) is provided with an insert block (17) inserted into the through groove (16); a clamping bolt (18) is provided near the through groove (16) of the moving block (5); the clamping bolts (18) on both sides clamp the insert block (17) in a position within the through groove (16).

4. A bending die for processing a mobile phone frame according to claim 1, characterized in that: The upper mold (1) comprises an upper pressing plate (19), a push hole (20) is provided on the upper pressing plate (19) at a position corresponding to the moving block (5), an ejector pin (7) is slidably provided in the ejector hole (20), and the lower end surface of the ejector pin (7) pushes against the upper end surface of the moving block (5).

5. A bending die for processing a mobile phone frame according to claim 1, characterized in that: The lower groove (10) is internally recessed with a receiving groove (21) for the mold block (9) to move up and down, and the bottom of the receiving groove (21) is provided with a pushing chamber (22) for placing a lifting cylinder.

6. A bending die for processing a mobile phone frame according to claim 1, characterized in that: The part positioning groove (8) comprises an end positioning plate (23), each of which is provided with an end positioning plate (23) on both sides of the lower groove (10). The two positioning plates are used to position the ends of the placed workpiece (32), and a positioning notch (24) is provided on one side of the two positioning plates close to each other.

7. A bending die for processing a mobile phone frame according to claim 1, characterized in that: A molding cavity (25) for molding a workpiece (32) is provided on the molding side wall (11) of the lower groove (10), and the molding cavity (25) includes an inclined cavity (26) and a vertical cavity (27); a roller shaft (28) is provided at the transition point between the inclined cavity (26) and the vertical cavity (27).

8. A bending die for processing a mobile phone frame according to claim 7, characterized in that: The roller shaft (28) is arranged through both sides of the lower groove (10) of the lower mold (2); the lower mold (2) is provided with an axial hole (29) for the roller shaft (28) to pass through; the lower part of the axial hole (29) away from the lower groove (10) is connected to a fan-shaped cavity (30); a plurality of rollers (31) are arranged in the fan-shaped cavity (30); and the rollers (31) are arranged parallel to the roller shaft (28).

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