High-wear-resistance mould for plastic processing

Abstract

This invention relates to the field of plastic molds and discloses a high wear-resistant mold for plastic processing, comprising a lower mold and an upper mold. The lower mold has a core for workpiece forming, and the core includes a first insert, a second insert, and a third insert that fit together. The second and third inserts are slidably engaged with the lower mold. The lower mold contains a support assembly for supporting the first, second, and third inserts, and also a control assembly for driving the movement of the support assembly. This invention, through the cooperation between the first insert, the second insert, the support assembly, and the control assembly, enables the sequential separation of the first, second, and third inserts from the workpiece, thereby achieving rapid demolding. Furthermore, the separation of the second and third inserts from the workpiece is achieved through translation along the top surface of the lower mold, effectively reducing damage to the workpiece's curved edges and ensuring the overall quality of the workpiece after demolding.

Description

Technical Field

[0001] This invention relates to the field of plastic mold technology, and in particular to a high wear-resistant mold for plastic processing. Background Technology

[0002] Mobile phone cases are mostly produced by injection molding. During injection molding, the inside of the mobile phone case is concave and the edges have a certain curvature. After injection molding, it is easy to stick to the surface of the mold and be stuck inside the mold cavity. The existing demolding method is to manually or with equipment pry the mobile phone case out of the mold cavity to separate it from the mold.

[0003] For example, Chinese Patent Publication No. CN117341148A discloses an injection molding mold and its rugged phone case, comprising a fixed template, a cross template, block templates, a movable frame, a cross plate, and a circular plate. The fixed template has an injection groove on one side and an injection hole on the other. A cross template is located on one side of the fixed template, and block templates are located at each of the four corners of the cross template. Guide pillars are fixedly connected inside each block template. The cross template and the four block templates form a movable template. During demolding, by first moving the cross template and then bringing them closer to the movable template, the contact area between the injection-molded phone case and the protruding modules is gradually reduced, decreasing the adhesion area between the phone case and the mold. This allows the phone case to be easily separated from the mold by air blowing or other methods, improving the processing efficiency of the phone mold.

[0004] The application achieves demolding by first moving the cross template and then bringing the moving templates closer together. However, the horizontal movement of the cross template will damage the curved edge of the phone case, thus affecting the overall quality of the phone case and having certain limitations in use.

[0005] Therefore, it is necessary to provide a high wear-resistant mold for plastic processing to solve the above-mentioned technical problems. Summary of the Invention

[0006] The purpose of this invention is to provide a high wear-resistant mold for plastic processing to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, a high wear-resistant mold for plastic processing is designed to effectively reduce damage to the curved edges of mobile phone cases.

[0008] Based on the above ideas, the present invention provides the following technical solution: a high wear-resistant mold for plastic processing, comprising a lower mold and an upper mold, wherein the lower mold is provided with a mold core for forming a workpiece, the mold core comprising a first insert, a second insert and a third insert that fit together, and the second insert and the third insert are slidably fitted with the lower mold, the interior of the lower mold is provided with a support assembly for supporting the first insert, the second insert and the third insert, and the interior of the lower mold is also provided with a control assembly for driving the support assembly to move; the control assembly, through the support assembly, can first drive the first insert and the second insert to be sequentially retracted into the lower mold, and then drive the third insert to be translated and closed along the top surface of the lower mold.

[0009] As a further aspect of the present invention: the number of the first insert, the second insert, and the third insert are one, two, and four, respectively, with the first insert located at the center, the two second inserts located on the upper and lower sides of the first insert, and the four third inserts distributed around the first insert.

[0010] As a further aspect of the present invention: the surface of the lower mold is provided with an opening for the placement of the support component and the control component, and the overall size of the opening is larger than the overall size of the first insert.

[0011] As a further embodiment of the present invention: the top surface of the lower mold is provided with a sliding groove for the second insert and the third insert to slide, and the bottom of the second insert and the third insert are movably mounted with rollers that slide in cooperation with the sliding groove. The cross section of the sliding groove is designed as an inverted T-shape or a dovetail groove.

[0012] As a further aspect of the present invention: the groove corresponding to the second insert extends into the opening and is designed in an L-shape, so that the second insert can first be translated based on the top surface of the lower mold, and then slide from the opening into the lower mold; the groove corresponding to the third insert is inclined based on the top surface of the lower mold, and the inclination points in the direction of the first insert, so that the four third inserts tend to converge towards the center when moving.

[0013] As a further aspect of the present invention: the support assembly includes a crossbar fixedly connected to the first insert, the outer surface of the crossbar is fitted with a first collar and a second collar, the first collar is located between the second collar and the first insert, the surface of the first collar is rotatably mounted with a first connecting rod that rotatably engages with the second insert, and the surface of the second collar is rotatably mounted with a second connecting rod that rotatably engages with the third insert.

[0014] As a further aspect of the present invention: the first connecting rod on the first collar and the second connecting rod on the second collar are staggered based on the circumferential direction of the crossbar.

[0015] As a further aspect of the present invention: the control component includes three cylinders fixedly installed in the opening, the output shaft of the first cylinder is fixedly connected to the crossbar, the output shaft of the second cylinder is fixedly connected to the first collar, and the output shaft of the third cylinder is fixedly connected to the second collar.

[0016] As a further aspect of the present invention: a fourth insert is elastically connected to the surface of one of the third inserts via a first spring, and a first pull rope fixedly installed on the surface of the fourth insert and fixedly connected to the first insert; when the first insert retracts downward into the mold, the first pull rope can drive the fourth insert to retract into the third insert and squeeze the first spring.

[0017] As a further aspect of the present invention: the middle of the first insert is circular and both the upper and lower sides are formed with protrusions, the width of the protrusions being equal to the width of the second insert.

[0018] Compared with the prior art, the beneficial effects of the present invention are: through the cooperation between the first insert, the second insert, the support component and the control component, the first insert, the second insert and the third insert can be separated from the workpiece in sequence, thereby achieving rapid demolding of the workpiece; and the separation of the second insert and the third insert from the workpiece adopts the form of translation along the top surface of the lower mold, which can effectively reduce damage to the arc edge of the workpiece, ensure the overall quality of the workpiece after demolding, and has higher practicality. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a perspective view of the overall structure of the present invention;

[0021] Figure 2 This is a schematic diagram of the internal structure of the lower mold of the present invention;

[0022] Figure 3 This is a schematic diagram of the crossbar and opening structure of the present invention;

[0023] Figure 4 This is a schematic diagram showing the disassembled structure of the crossbar, the first collar, and the second collar of the present invention;

[0024] Figure 5 This is a schematic diagram of the lower mold and slide structure of the present invention;

[0025] Figure 6 for Figure 5 Enlarged view of the structure at point A in the middle;

[0026] Figure 7 This is a schematic diagram of the structure of the first insert, the second insert, and the third insert of the present invention;

[0027] Figure 8This is a schematic diagram of the third and fourth insert structures of the present invention;

[0028] Figure 9 This is a schematic diagram of the first insert and the first pull rope structure of the present invention;

[0029] Figure 10 This is a schematic diagram of the base plate and top rod structure of the present invention;

[0030] Figure 11 This is a schematic diagram of the second pull rope and reversing wheel structure of the present invention.

[0031] In the diagram: 1. Lower mold; 2. Upper mold; 3. Mold core; 4. Support assembly; 5. Control assembly; 6. Roller; 7. Base plate; 8. Top rod; 9. Second pull rope; 10. Reversing wheel; 101. Opening; 102. Slide groove; 301. First insert; 302. Second insert; 303. Third insert; 304. Fourth insert; 305. Groove; 306. First spring; 307. First pull rope; 401. Crossbar; 402. First collar; 403. Second collar; 404. First connecting rod; 405. Second connecting rod. Detailed Implementation

[0032] Example 1:

[0033] Please see Figures 1 to 6 This invention provides a high wear-resistant mold for plastic processing, mainly used to achieve rapid demolding of mobile phone cases and effectively avoid damage to the cases. It includes a lower mold 1 and an upper mold 2 that are mutually compatible. The lower mold 1 is provided with a mold core 3 for forming the mobile phone case. When the upper mold 2 and the lower mold 1 are closed, the mold core 3 automatically forms the mobile phone case. In this embodiment, the upper mold 2 and the lower mold 1 are side-mounted, and both can be made of heat-treated P20 steel, which has good wear resistance. Both are existing mature technologies and will not be described in detail here.

[0034] Furthermore, the mold core 3 includes a first insert 301, a second insert 302, and a third insert 303 that fit together. The second insert 302 and the third insert 303 are in sliding engagement with the lower mold 1. The lower mold 1 is internally provided with a support component 4 for supporting the first insert 301, the second insert 302, and the third insert 303. The lower mold 1 is also internally provided with a control component 5 for driving the support component 4 to move. When the control component 5 is activated, the support component 4 can first drive the first insert 301 to retract into the lower mold 1, then drive the second insert 302 to retract into the lower mold 1, and finally drive the third insert 303 to move closer to the phone case to complete the separation.

[0035] In this embodiment, there is one first insert 301 located in the center, two second inserts 302 located on the upper and lower sides of the first insert 301, and four third inserts 303 distributed around the first insert 301. The first insert 301, the two second inserts 302 and the four third inserts 303 are combined to form the mobile phone case mold core 3 for mobile phone case molding.

[0036] The lower mold 1 has an opening 101 on its surface for the support component 4 and the control component 5 to be placed. The support component 4 supports the first insert 301, the second insert 302 and the third insert 303 through the opening 101 respectively. The size of the opening 101 is larger than the size of the first insert 301, so that the first insert 301 can move directly based on the opening 101.

[0037] Reference Figures 4 to 6 In this embodiment, preferably, the top surface of the lower mold 1 is provided with a groove 102 for the second insert 302 and the third insert 303. The groove 102 corresponding to the second insert 302 extends into the opening 101 and has an overall L-shaped design, so that the second insert 302 can first slide horizontally based on the top surface of the lower mold 1, and then slide from the opening 101 into the interior of the lower mold 1. Here, the movement stroke of the two second inserts 302 is: first they move closer to each other, then they change direction at the junction of the groove 102, and after changing direction, they slide from the opening 101 into the interior of the lower mold 1.

[0038] The slide groove 102 corresponding to the third insert 303 is designed with an overall inclination based on the top surface of the lower mold 1, and the inclination points towards the direction of the first insert 301. This makes the sliding of the third insert 303 based on the top surface of the lower mold 1 inclined towards the first insert 301, thereby making the four third inserts 303 tend to converge towards the center when moving.

[0039] Correspondingly, the bottom of the second insert 302 and the third insert 303 are movably equipped with rollers 6 that slide in cooperation with the slide groove 102. The rollers 6 can move horizontally and rotate within the slide groove 102 without falling off. Correspondingly, the cross section of the slide groove 102 can be an inverted T-shaped design or a dovetail groove design, etc.

[0040] Reference Figures 2 to 4 In this embodiment, preferably, the support component 4 includes a crossbar 401 fixedly connected to the first insert 301. The outer surface of the crossbar 401 is fitted with a first collar 402 and a second collar 403. The first collar 402 is located between the second collar 403 and the first insert 301. The surface of the first collar 402 is rotatably mounted with a first connecting rod 404 that rotatably engages with the second insert 302. The surface of the second collar 403 is rotatably mounted with a second connecting rod 405 that rotatably engages with the third insert 303.

[0041] To ensure proper quantity matching, the number of first connecting rods 404 and second connecting rods 405 are two and four respectively, and the first connecting rods 404 and second connecting rods 405 are staggered within the opening 101, so that the movement of the first connecting rod 404 driven by the first collar 402 and the movement of the second connecting rod 405 driven by the second collar 403 will not interfere with each other. The first collar 402 can drive the second insert 302 to move along the slide groove 102 via the first connecting rod 404, and the second collar 403 can drive the third insert 303 to move along the slide groove 102 via the second connecting rod 405.

[0042] The shape of the first ring 402 can be configured to fit the first insert 301, so that the movement of the first ring 402 driving the first connecting rod 404 will not interfere with the first insert 301, nor with the moved first insert 301. The crossbar 401, the first ring 402 and the second ring 403 are all driven by the control component 5 to complete the corresponding movement.

[0043] Reference Figures 2 to 4 In this embodiment, preferably, the control component 5 includes three cylinders fixedly installed in the opening 101. The output shaft of the first cylinder is fixedly connected to the crossbar 401, the output shaft of the second cylinder is fixedly connected to the first collar 402, and the output shaft of the third cylinder is fixedly connected to the second collar 403.

[0044] The first cylinder is activated first, causing the crossbar 401 and the first insert 301 to retract into the lower mold 1, and providing space for the movement of the two second inserts 302. Then, the second cylinder drives the first collar 402 to move, and through the first connecting rod 404, it drives the two second inserts 302 to move horizontally to the top surface of the lower mold 1, and then turns to retract into the lower mold 1 from the opening 101, providing space for the movement of the four third inserts 303. Finally, the third cylinder drives the second collar 403 to move, and through the second connecting rod 405, it drives the four third inserts 303 to move horizontally along the top surface of the lower mold 1 to the center and close together, completing the separation and demolding from the phone case.

[0045] In use, the upper mold 2 and the lower mold 1 close together and the phone case is formed through the mold core 3. Then, the upper mold 2 moves away and the phone case is locked onto the mold core 3. Then, the first cylinder is activated, which drives the crossbar 401 and the first insert 301 to retract into the lower mold 1. The second cylinder is activated, which drives the first collar 402 to move. Through the first connecting rod 404, the slide groove 102 and the roller 6, the two second inserts 302 are also retracted into the lower mold 1. Finally, the third cylinder is activated, which drives the second collar 403 to move. Through the second connecting rod 405, the slide groove 102 and the roller 6, the four third inserts 303 are moved and closed along the top surface of the lower mold 1.

[0046] During this process, the first insert 301 is retracted into the lower mold 1 from the center of the mold core 3 without damaging the phone case. The second insert 302 first moves along the top surface of the lower mold 1 and then moves into the lower mold 1. It can move and separate from the curved edge of the phone case without damaging the phone case. The third insert 303 moves and closes along the top surface of the lower mold 1, thus completing the overall demolding from the phone case. It can also move and separate from the curved edge of the phone case without damaging the phone case.

[0047] In this embodiment, the first insert 301 is shaped like a keyhole, that is, it is circular in the middle and has protrusions on both the top and bottom sides. The width of the protrusions is adapted to the width of the second insert 302. The shape design of the first insert 301 allows the two second inserts 302 to first move closer to each other and then retract into the lower mold 1 from the opening 101.

[0048] Furthermore, such as Figure 7 As shown, the middle of the first insert 301 can also be designed as an ellipse, with indentations on both the upper and lower sides. In this case, the length of the second insert 302 in the vertical direction is greatly shortened, so that the second insert 302 only needs to be translated along the top surface of the lower mold 1 to form a space for the third insert 303 to be translated and closed along the top surface of the lower mold 1. At this time, it is not necessary to set the slide groove 102 corresponding to the second insert 302 in an L-shape, nor is it necessary to retract the second insert 302 into the lower mold 1. Both the second insert 302 and the third insert 303 are translated along the top surface of the lower mold 1.

[0049] In summary, through the cooperation of the first insert 301, the second insert 302, the crossbar 401, and the slide 102, the first insert 301, the second insert 302, and the third insert 303 can be separated from the phone case in sequence, thereby achieving rapid demolding of the phone case. Furthermore, the separation of the second insert 302 and the third insert 303 from the phone case adopts a translational form along the top surface of the lower mold 1, which can effectively reduce damage to the curved edges of the phone case, ensure the overall quality of the phone case after demolding, and improve its practicality.

[0050] Example 2:

[0051] Please see Figures 1 to 9 Based on Embodiment 1, considering that some phone cases often have recessed holes on their inner walls and at the position corresponding to the third insert 303 in order to accommodate the protruding camera of the phone, the presence of the recessed holes affects the translation of the third insert 303 along the top surface of the lower mold 1, thereby affecting the overall demolding of the workpiece.

[0052] Therefore, one of the third inserts 303 is improved: A fourth insert 304 is elastically connected to the surface of one of the third inserts 303 via a first spring 306, and a first pull rope 307, fixedly connected to the first insert 301, is also fixedly installed on the surface of the fourth insert 304. When the first insert 301 retracts into the lower mold 1 via the crossbar 401, the fourth insert 304 can also be pulled by the first pull rope 307, causing the fourth insert 304 to retract into the third insert 303 and compress the first spring 306. At this time, the third insert 303 is limited by the second insert 302 and cannot move.

[0053] The surface of the third insert 303 is provided with a groove 305 for the fourth insert 304 and the first spring 306 to be placed. The pull rope extends from the groove 305 to the outside of the third insert 303 and is fixedly connected to the first insert 301.

[0054] In use, the structure of the first insert 301, the second insert 302, and the slide groove 102 enables rapid demolding of the phone case and effectively reduces damage to the curved edges of the phone case. The working process and effect of this part are the same as in Embodiment 1, and will not be repeated here. The difference is that when the upper mold 2 and the lower mold 1 are closed, the fourth insert 304 can be adapted to the position of the phone camera to provide space for its molding. When the first cylinder is activated, it drives the crossbar 401 and the first insert 301 to retract into the lower mold 1. The first insert 301 also pulls the fourth insert 304 through the first pull rope 307, so that the fourth insert 304 retracts into the groove 305. Subsequently, when the third cylinder drives the third insert 303 to move along the top surface of the lower mold 1 through the second collar 403, the second connecting rod 405, the slide groove 102, and the roller 6, the fourth insert 304 will not interfere with the third insert 303 because it has completed its retraction.

[0055] Compared to Embodiment 1, through the cooperation of the first insert 301, the fourth insert 304, the pull cord, and the first spring 306, the fourth insert 304 can automatically retract based on the third insert 303 after the first insert 301 moves. This avoids affecting the subsequent translation and closing of the third insert 303 along the top surface of the lower mold 1, thus adapting to the molding requirements of the camera, ensuring rapid demolding, and preventing damage to the camera area of ​​the phone case. The overall solution, combined with the movement of the first insert 301, and the retraction and avoidance mechanism of the fourth insert 304, can also be applied to the volume and power buttons of the phone case, thus making the overall applicability stronger.

[0056] Example 3:

[0057] Please see Figures 1 to 11Based on Embodiment 2, considering that the phone case is still suspended on the two upper third inserts 303 after the third insert 303 is translated and closed, a material feeding structure is required, which increases production costs and reduces overall work efficiency.

[0058] Therefore, the lower mold 1 is improved: A base plate 7 and a push rod 8 are slidably installed inside the lower mold 1. The base plate 7 is located below the two lower third inserts 303, while the push rod 8 corresponds to the position of the upper second insert 302. A second pull rope 9 is fixedly installed at the ends of the base plate 7 and the push rod 8 inside the lower mold 1. The movable end of the second pull rope 9 on the base plate 7 is fixedly connected to the crossbar 401, and the movable end of the second pull rope 9 on the push rod 8 is fixedly connected to the second collar 403. A reversing wheel 10 is rotatably installed inside the lower mold 1 to accommodate the second pull rope 9, so that when the crossbar 401 / second collar 403 moves, the second pull rope 9 can be released or pulled accordingly. Furthermore, the two sets of second pull ropes 9 and reversing wheels 10 can be staggered without affecting the movement of other structures.

[0059] Meanwhile, a second spring (not shown in the figure) is fixedly installed between the base plate 7 and the ejector pin 8 and the lower mold 1. The second spring causes the base plate 7 and the ejector pin 8 to tend to extend outward from the lower mold 1, and in the initial state, the ends of the base plate 7 and the ejector pin 8 are flush with the top surface of the lower mold 1.

[0060] In use, the first insert 301, the second insert 302 and the slide 102 can achieve rapid demolding of the phone case and effectively reduce damage to the curved edge of the phone case; the first insert 301, the fourth insert 304 and the first spring 306 can achieve automatic shrinkage of the fourth insert 304 based on the third insert 303, avoiding affecting the subsequent translation and closing of the third insert 303 along the top surface of the lower mold 1. The working process and effect of this part are the same as in Embodiment 2, and will not be repeated here. The difference is as follows: when the crossbar 401 moves, the corresponding second pull rope 9 is released, and the base plate 7 extends from the lower mold 1 through the second spring to support the phone case; when the second collar 403 moves, the corresponding second pull rope 9 is also released, and the top rod 8 extends from the position of the upper second insert 302 of the lower mold 1 through the second spring. With the translation and closing of the four third inserts 303, the top rod 8 can push the phone case based on the top surface of the base plate 7 along the axial direction of the crossbar 401, completely separating it from the third inserts 303.

[0061] Compared to Embodiment 2, through the cooperation of the base plate 7, push rod 8, crossbar 401, and second ring 403, when the crossbar 401 moves, it not only drives the first insert 301 to move, but also drives the base plate 7 to extend from the lower mold 1 to support the phone case; when the second ring 403 moves, it not only drives the fourth insert 304 to move, but also drives the push rod 8 to extend from the position of the corresponding upper second insert 302, pushing the phone case out of the lower mold 1 to achieve complete separation, which can further improve the overall demolding efficiency. The overall solution, combined with the movement of the crossbar 401 and the second ring 403, with the base plate 7 located below the third insert 303 and the push rod 8 blocked by the second insert 302, will not affect the molding of the phone case, ensuring the molding quality of the phone case and meeting more needs in actual use.

Claims

1. A high wear-resistant mold for plastic processing, comprising a lower mold and an upper mold, characterized in that, The lower mold is provided with a mold core for workpiece forming. The mold core includes a first insert, a second insert, and a third insert that fit together. The second insert and the third insert are slidably engaged with the lower mold. The lower mold is provided with a support assembly for supporting the first insert, the second insert, and the third insert. The lower mold is also provided with a control assembly for driving the support assembly to move. When the control assembly is activated, it can first drive the first insert and the second insert to be retracted into the lower mold in sequence through the support assembly, and then drive the third insert to be moved and closed along the top surface of the lower mold. The number of the first insert, the second insert, and the third insert are one, two, and four, respectively. The first insert is located in the center, the two second inserts are located on the top and bottom sides of the first insert, and the four third inserts are distributed around the first insert. The surface of the lower mold has an opening for the placement of the support component and the control component, and the overall size of the opening is larger than the overall size of the first insert. The top surface of the lower mold is provided with a sliding groove for the second and third inserts to slide. The bottom of the second and third inserts are movably equipped with rollers that slide in cooperation with the sliding groove. The cross section of the sliding groove is an inverted T-shape or a dovetail groove design. The groove corresponding to the second insert extends into the opening and has an overall L-shaped design, so that the second insert can first be translated based on the top surface of the lower mold and then slide from the opening into the lower mold; the groove corresponding to the third insert is inclined based on the top surface of the lower mold and the inclination points in the direction of the first insert, so that the four third inserts tend to converge towards the center when they move. The support assembly includes a crossbar fixedly connected to the first insert. The outer surface of the crossbar is fitted with a first collar and a second collar. The first collar is located between the second collar and the first insert. The surface of the first collar is rotatably mounted with a first connecting rod that rotatably engages with the second insert. The surface of the second collar is rotatably mounted with a second connecting rod that rotatably engages with the third insert.

2. The high wear resistant mold for plastic processing according to claim 1, characterized by, The first link on the first collar and the second link on the second collar are offset from each other based on the circumferential direction of the crossbar.

3. The high wear resistant mold for plastic processing according to claim 2, characterized by, The control assembly includes three cylinders fixedly installed in the opening. The output shaft of the first cylinder is fixedly connected to the crossbar, the output shaft of the second cylinder is fixedly connected to the first collar, and the output shaft of the third cylinder is fixedly connected to the second collar.

4. The high wear resistant mold for plastic processing according to any one of claims 1 to 3, characterized by, One of the third inserts has a fourth insert elastically connected to its surface via a first spring, and a first pull rope fixedly installed on the surface of the fourth insert and fixedly connected to the first insert; when the first insert retracts into the mold downwards, the first pull rope can drive the fourth insert to retract into the third insert and squeeze the first spring.

5. The high wear resistant mold for plastic processing according to claim 4, wherein The first insert has a circular center and protrusions on both the top and bottom sides, with the width of the protrusions matching the width of the second insert.

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