Injection mold structure of shell with 0-degree appearance dermatoglyph draft

Abstract

The utility model discloses an injection mold of an appearance dermatoglyph 0-degree draft shell, which comprises a front mold and a rear mold, a plate A is arranged in the front mold, a plate B and a support plate are arranged in the rear mold, an elastic piece is arranged between the plate B and the support plate, and when the mold is closed, the plate B is attached to the support plate, the plate A is attached to the plate B, and the elastic piece is compressed; the supporting plate is connected with the B plate through a pull rod; a sliding block I of which one end extends into the cavity is arranged on the rear mold; a tapered wedge for driving one side of the sliding block to be pulled out is arranged on the front mold; the rear mold is provided with a sliding block mechanism, and the sliding block mechanism comprises a core pulling rod, a second sliding block and an inclined guide column. A secondary parting structure is adopted to be matched with the first sliding block and the second sliding block, a plastic part is cooled on the rear mold core to be shrunk to be smaller than the cavity and then is separated from the cavity, and therefore the leather texture is prevented from being strained.

Description

Technical Field

[0001] The utility model relates to the field of injection molds, in particular to an injection mold structure of a shell with a 0° draft angle and a leather grain appearance. Background Art

[0002] Figure 1 It is a shell with an annular structure with an inner hole, and its outer peripheral surface needs to be provided with (even coarse) leather grain. The mold opening of plastic parts with this structure usually adopts a half mold structure with left and right sliders (or three-sided sliders or multi-sided sliders), adopting a left and right parting method, and there is a parting line in the middle of the product appearance. The parting line in the middle of the product is difficult to control, prone to flash, and easy to pull the mold, affecting the life of the mold. If the mold is set to part along the axial direction of the shell, since the product adheres firmly to the core when the mold is opened, the presence of leather grain will cause the leather grain to adhere to the cavity, and the leather grain surface will be damaged when the cavity is separated from the product. Utility Model Content

[0003] In view of the shortcomings of the existing technology, the utility model provides an injection mold structure for a shell with a 0° draft of the appearance leather grain, which mainly solves the problem that the appearance leather grain of the plastic part is easily scratched when the mold is opened.

[0004] To achieve the above-mentioned purpose, the present invention is realized through the following technical solutions:

[0005] An injection mold structure for a housing with a 0° draft and a leather grain appearance, comprising a front mold and a rear mold, wherein a front mold core is provided in the front mold, a rear mold core is provided in the rear mold, a plate A is provided in the front mold, a plate B and a support plate are provided in the rear mold, and the rear mold core is fixed to the support plate and extends through the plate B into the cavity of the front mold core;

[0006] An elastic member is provided between the B plate and the support plate. When the mold is closed, the A plate and the B plate fit together, and the B plate and the support plate fit together, and the elastic member is compressed;

[0007] The support plate and plate B are connected by a tie rod. There is a space on the plate B for the tie rod to move along the mold opening direction. After the mold is opened, the elastic member rebounds and drives the support plate and plate B to separate, while plate B remains stationary.

[0008] The rear mold is provided with a slider with one end extending into the mold cavity, and the front mold is provided with an inclined wedge for driving one side of the slider to withdraw;

[0009] The rear mold is equipped with a slider mechanism, which includes a core pulling rod, a second slider and an inclined guide column. The second slider is mounted on the B plate. The core pulling rod is slidably connected to the second slider. The other end of the core pulling rod extends into the mold cavity. The inclined guide column is fixed to the support plate and cooperates with the second slider to drive the core pulling rod to move horizontally and drag the plastic part.

[0010] When the mold is opened, the elastic part rebounds to separate the first parting surface between the support plate and the B plate first, and the core is separated from the plastic part first. During this period, a dwell time is set to allow the plastic part remaining in the cavity to be fully and evenly cooled and shrunk in the water channel in the cavity, so that the appearance surface of the plastic part is separated from the cavity. After the set dwell time is over, driven by the injection molding machine, the second parting surface between the A plate and the B plate is opened. Under the dragging action of sliders 1 and 2 on the plastic part, the plastic part remains in the rear mold, and then under the action of the injection molding machine's ejector, the ejector mechanism of the mold is pushed to eject the plastic part.

[0011] Furthermore, the elastic member is a rubber or a spring.

[0012] Furthermore, a plurality of elastic members are provided, and the elastic members are evenly distributed around the rear mold core.

[0013] Furthermore, the front mold core includes an annular mold core block and a central mold core block. The central mold core block is located in the center hole of the annular mold core block. An annular cooling water channel is formed between the outer peripheral surface of the annular mold core block and the A plate. An annular groove is provided on the outer end surface of the central mold core block. An annular cooling water channel is formed between the annular groove and the end surface of the runner plate to ensure that the plastic part remains in the mold cavity and is fully cooled.

[0014] Furthermore, an annular groove is provided on the outer peripheral surface of the annular mold core block, and an annular cooling water channel is formed between the annular groove and the inner wall of the cavity on the A plate for accommodating the annular mold core block.

[0015] Furthermore, a receiving hole is provided on the B plate for the pull rod to move along the mold opening direction. The receiving hole is stepped by a first hole and a second hole that are coaxially connected. The outer diameter of the first hole is larger than the outer diameter of the second hole. The first hole is located on the side of the second hole facing away from the support plate. A boss is provided at one end of the pull rod, and the boss is located in the first hole. The other end of the pull rod is fixed to the support plate after passing through the second hole. Along the mold opening direction, the thickness of the boss is less than the length of the first hole, and the spacing of the first parting is less than or equal to the spacing of the pull rod movement.

[0016] Furthermore, a nylon buckle is installed on the B plate, and the nylon buckle is interference fit with the corresponding hole on the A plate.

[0017] The utility model has the following beneficial effects:

[0018] 1. The mold can be demoulded at 0° by parting along the mold opening direction. Compared with the traditional Haval mold structure with left and right parting, this mold structure is simpler and has lower manufacturing cost.

[0019] 2. The plastic part is detached from the rear mold core, creating a gap between the core and the plastic part to provide space for the plastic part to cool and shrink. The plastic part remains in the cavity, and a circular water channel is set around the cavity to facilitate the cooling and shrinkage of the plastic part. After the plastic part cools and shrinks, its size is reduced and then separated from the cavity, thereby ensuring that the plastic part will not be squeezed when it is detached from the cavity, avoiding damage to the appearance surface.

[0020] 3. The design of the annular cooling water channel around the mold cavity has a better and more uniform cooling effect than the conventional linear water channel, ensuring that the skin surface of the cavity shell can be evenly and fully cooled and shrunk.

[0021] 4. There is no parting line on the surface of the plastic part, the appearance is beautiful, and the draft angle can be set to basically 0°.

[0022] 5. The leather grain or even cloth grain on the exterior surface of the plastic part will not be pulled by the mold, and the mold life is longer than that of the Haval mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the housing according to an embodiment of the present utility model;

[0024] Figure 2 Schematic diagram of the front mold of the embodiment;

[0025] Figure 3 Schematic diagram of the rear mold of the embodiment;

[0026] Figure 4 This is a schematic diagram of the rear mold after removing plate B, with the shell on the rear mold core;

[0027] Figure 5 This is one of the cross-sectional views of the injection mold for the exterior leather grain 0° draft housing, the section passing through the slider;

[0028] Figure 6 This is the second cross-sectional view of the injection mold of the shell with 0° draft and leather grain, and the cross-section passes through the elastic part;

[0029] Figure 7 This is the third cross-sectional view of the injection mold for the 0° draft housing with leather grain, the section passing through the tie rod;

[0030] Figure 8 This is the fourth cross-sectional view of the injection mold for the exterior leather grain 0° draft housing. The section passes through the elastic part, tie rod and nylon drawstring (opener).

[0031] Explanation of reference numbers: 1. Front mold base plate; 2. Runner plate; 3. Plate A; 4. Rear mold core; 5. Plate B; 6. Support plate; 7. Ejector fixing plate; 8. Ejector; 9. Ejector plate; 10. Rear mold base plate; 11. Nylon buckle; 12. Elastic part; 13. Pull rod; 14. Slider 1; 15. Wedge; 16. Pull rod; 17. Slider 2; 18. Annular mold core block; 19. Center mold core block; 20. Annular groove; 21. Inclined guide column; 100. Shell; 101. Buckle; 102. Hole. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0034] like Figures 2 to 8 As shown, this embodiment provides an injection mold structure of a shell with a 0° draft of leather grain, which is used to produce Figure 1 The outer peripheral surface shown is provided with a shell 100 with leather grain. As shown in the figure, the injection mold includes a front mold and a back mold, the front mold includes a front mold base plate 1, a runner plate 2, an A plate 3 and a front mold core, and the back mold includes a back mold core 4, a B plate 5, a support plate 6, an ejector fixing plate 7, an ejector plate 9, a back mold base plate 10, an ejector 8, a reset rod and a reset spring, etc. The front mold core is provided with a cavity, and the back mold core 4 is fixed on the support plate 6 and extends through the B plate 5 into the cavity of the front mold core. After the injection molding machine is activated, the front and rear molds are separated, thereby separating the B plate 5 and the A plate 3 to open the mold cavity and remove the plastic part. The ejector fixing plate 7, the ejector plate 9 and the ejector 8 constitute an ejection mechanism, and after the mold cavity is opened, the plastic part is ejected.

[0035] like Figure 4 and Figure 8 , a nylon buckle 11 is installed on the B plate 5, and the nylon buckle 11 is interference fit with the corresponding hole on the A plate 3. An elastic part 12 is provided between the B plate 5 and the support plate 6. When the mold is closed, the A plate 3 and the B plate 5 are in contact with each other, and the B plate 5 and the support plate 6 are in contact with each other, and the elastic part 12 is compressed. The elastic part 12 is fixed to the support plate 6 and has an interference fit with the end face of the B plate 5 (that is, the elastic part is squeezed by the B plate in the closed mold state). After the mold is opened, the elastic part 12 rebounds to drive the support plate 6 to separate from the B plate 5. The elastic part 12 is not limited to elastomeric and springs, and there are multiple and evenly distributed elastic parts.

[0036] like Figure 8, the support plate 6 and the B plate 5 are connected by a pull rod 13, and the B plate 5 is provided with a distance for the pull rod 13 to move along the mold opening direction. Specifically, the B plate is provided with a receiving hole, and the receiving hole is stepped by a first hole and a second hole that are coaxially connected. The outer diameter of the first hole is larger than the outer diameter of the second hole, and the first hole is located on the side of the second hole facing away from the support plate 6. A boss is provided at one end of the pull rod 13, and the boss is located in the first hole. The other end of the pull rod 13 is fixed on the support plate 6 after passing through the second hole. The thickness of the boss is less than the length of the first hole, that is, the spacing of the first parting is less than or equal to the spacing of the pull rod movement. In the mold closing state, the distance between the boss and the stepped surface of the receiving hole is H, which is also the distance of the first parting when the mold is opened, that is, after the elastic member 12 drives the B plate 5 and the support plate 6 to separate by a distance of H, the pull rod 13 starts to pull the B plate 5 for the second parting.

[0037] The outer surface of the shell 100 is provided with buckles 101 that need to be pulled out from the side. The rear mold is provided with a slider 14 for forming these buckles 101, and the front mold is provided with an inclined wedge 15 for driving the slider 14 to be pulled out from the side. Figure 3 and Figure 5 In other embodiments, the slider is not limited to being used for forming buckles.

[0038] In addition, the side of the housing 100 is provided with a hole 102. The rear mold is provided with a slider mechanism, such as Figure 5 The slider mechanism includes a core pulling rod 16, a second slider 17 and an inclined guide column 21. The second slider 17 is installed on the B plate. The core pulling rod 16 is slidably connected to the second slider 17 (a boss is provided at one end of the core pulling rod, and a slide groove is provided on the second slider, and the boss slides in the slide groove). One end of the core pulling rod 16 (the end is cylindrical) extends into the mold cavity to form a hole 102 on the plastic part (in other embodiments, the second slider is not limited to being used for forming holes). The inclined guide column 21 is fixed on the support plate 6 and cooperates with the second slider 17 to drive the core pulling rod 16 to move laterally for lateral core pulling. Before the plastic part is completely separated from the cavity, the core pulling rod 16 and the slider 1 always hook the plastic part. Therefore, after the first parting, a gap is formed between the rear mold core 4 and the plastic part. Since the second parting is not started, the plastic part remains in the cavity. At this time, the plastic part cools in the cavity for a period of time. After that, the plastic part shrinks due to cooling and separates from the cavity surface. At this time, the second parting is started. Due to the action of sliders 1 and 2, the plastic part remains in the rear mold. As the distance of the second parting becomes larger and larger, it is sufficient to take out the plastic part. Under the action of the ejector pin of the injection molding machine, the ejector mechanism is pushed to eject the plastic part. At this time, the entire plastic part mold opening and removal action is completed.

[0039] The following is a detailed description of the mold opening process:

[0040] As shown in the figure, when the injection molding machine opens the mold, the first parting begins under the interference fit force of the elastic rubber. At this time, the injection molding machine only drives the rear mold (excluding plate B 5) to move a certain distance (the injection molding machine sets the movement distance parameters). This distance is less than or equal to the distance the pull rod 13 moves (to ensure that the second parting does not move). When the pull rod 13 is pulled to the distance parameter set for the first parting spacing, it drives the rear mold core 4 to separate from the plastic part a certain distance first. The plastic part does not move in the entire mold cavity, but the rear mold core 4 separates from the plastic part first. The plastic part then continues to cool in the mold cavity for a period of time. Before cooling is completed, the second parting remains fixed and immobilized due to the interference fit of the nylon fastener 11. Then the injection molding machine continues to drive the rear mold to move, thereby starting the second parting. At this time, the plastic part is retained on the rear mold core 4 under the action of the core pulling rod 16. As the parting distance continues to increase, the slider 2 17 drives the core pulling rod 16 to gradually pull sideways out of the product, and the slider 1 also gradually pulls sideways out of the product. The plastic part remains on the rear mold core 4, and then under the action of the injection molding machine's ejector, it pushes the ejector plate 9, thereby pushing the ejector pin 8 to eject the plastic part.

[0041] When the second parting action begins, the plastic part separates from the cavity, and the rear mold core 4 is disengaged from the plastic part during the first parting action. The gap between the rear mold core 4 and the plastic part provides space for the plastic part to cool and shrink, thereby ensuring that the plastic part is smaller than the cavity surface and the appearance of the leather surface will not be damaged during demolding.

[0042] During the mold closing process, the ejector pin of the injection molding machine withdraws, and under the action of the reset pin spring and the reset pin, the ejector mechanism returns to its original position to ensure that the ejector mechanism does not hit the front mold core.

[0043] Water cooling is a key factor in preventing the surface of the product from being damaged. This mold requires a longer cooling time than conventional molds. After the first parting action and before the second parting action, the cavity needs to continue cooling for a period of time to ensure that the plastic part is fully cooled during demolding and that the surface of the surface is not damaged. Even coarse cloth textures with a depth of 0.13mm are not damaged. To ensure uniform cooling of the plastic part, a circular cooling water channel is set around the cavity.

[0044] Specifically, the front mold core includes an annular mold core block 18 and a central mold core block 19. The central mold core block 19 is located in the center hole of the annular mold core block 18, and an annular cooling water channel is formed between the outer peripheral surface of the annular mold core block 18 and the A plate 3. An annular groove 20 is provided on the outer peripheral surface of the annular mold core block 18, and an annular cooling water channel is formed between the annular groove 20 and the inner wall of the cavity on the A plate 3 for accommodating the annular mold core block 18. Alternatively, an annular groove 20 is provided on the inner wall of the cavity on the A plate 3 for accommodating the annular mold core block 18, and an annular cooling water channel is formed between the outer peripheral surface of the annular mold core block and the inner wall of the cavity on the A plate 3 for accommodating the annular mold core block 18. The annular groove 20 is provided on the annular mold core block 18 for easy processing. In addition, an annular groove 20 is provided on the outer end surface of the central mold core block, and an annular cooling water channel is formed between the annular groove 20 and the bottom surface of the flow channel plate 2. A cooling water channel is also provided on the rear mold core 4.

[0045] The mold provided in this embodiment utilizes a secondary parting structure in conjunction with a slider mechanism. After the first parting, the core is separated from the molded part, providing space for the part to cool and shrink. Meanwhile, the part remains in the mold cavity, where it is fully cooled by the cavity water channel, causing the part to shrink and its surface to separate from the cavity. After the second parting, the part is ejected from the rear mold using ejector pins 8. Based on the design principles of this mold, a similar mold structure can also be used to retain the part in the front mold after the second parting.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present invention. Therefore, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present invention.

Claims

1. An injection mold structure for a housing with a 0° draft and a leather grain appearance, characterized in that: It includes a front mold and a back mold, wherein the front mold is provided with a front mold core, the back mold is provided with a back mold core, the front mold is provided with an A plate, the back mold is provided with a B plate and a support plate, and the back mold core is fixed on the support plate and extends through the B plate into the cavity of the front mold core; An elastic member is provided between the B plate and the support plate. When the mold is closed, the A plate and the B plate fit together, and the B plate and the support plate fit together, and the elastic member is compressed; The support plate and plate B are connected by a tie rod. There is a space on the plate B for the tie rod to move along the mold opening direction. After the mold is opened, the elastic member rebounds and drives the support plate and plate B to separate, while plate B remains stationary. The rear mold is provided with a slider with one end extending into the mold cavity, and the front mold is provided with an inclined wedge for driving one side of the slider to withdraw; The rear mold is equipped with a slider mechanism, which includes a core pulling rod, a second slider and an inclined guide column. The second slider is mounted on the B plate. The core pulling rod is slidably connected to the second slider. The other end of the core pulling rod extends into the mold cavity. The inclined guide column is fixed to the support plate and cooperates with the second slider to drive the core pulling rod to move horizontally and drag the plastic part. When the mold is opened, the elastic part rebounds to separate the first parting surface between the support plate and the B plate first, and the core is separated from the plastic part first. During this period, a dwell time is set to allow the plastic part remaining in the cavity to be fully and evenly cooled and shrunk in the water channel in the cavity, so that the appearance surface of the plastic part is separated from the cavity. After the set dwell time is over, driven by the injection molding machine, the second parting surface between the A plate and the B plate is opened. Under the dragging action of sliders 1 and 2 on the plastic part, the plastic part remains in the rear mold, and then under the action of the injection molding machine's ejector, the ejector mechanism of the mold is pushed to eject the plastic part.

2. The injection mold structure of the housing with 0° draft and leather grain according to claim 1, characterized in that: The elastic member is a rubber or a spring.

3. The injection mold structure of the housing with 0° draft and leather grain appearance according to claim 1, characterized in that: There are multiple elastic parts, and the elastic parts are evenly distributed around the rear mold core.

4. The injection mold structure of the housing with 0° draft and leather grain appearance according to claim 1, characterized in that: The front mold core includes an annular mold core block and a central mold core block. The central mold core block is located in the center hole of the annular mold core block. An annular cooling water channel is formed between the outer peripheral surface of the annular mold core block and the A plate. An annular groove is provided on the outer end surface of the central mold core block. An annular cooling water channel is formed between the annular groove and the end surface of the runner plate to ensure that the plastic part remains in the mold cavity and is fully cooled.

5. The injection mold structure of the housing with 0° draft and leather grain appearance according to claim 4, characterized in that: An annular groove is provided on the outer peripheral surface of the annular mold core block, and an annular cooling water channel is formed between the annular groove and the inner wall of the cavity on the A plate for accommodating the annular mold core block.

6. The injection mold structure of the housing with 0° draft and leather grain appearance according to claim 1, characterized in that: The B plate is provided with an accommodating hole for the pull rod to move along the mold opening direction. The accommodating hole is stepped by a first hole and a second hole that are coaxially connected. The outer diameter of the first hole is larger than the outer diameter of the second hole. The first hole is located on the side of the second hole facing away from the support plate. A boss is provided at one end of the pull rod, and the boss is located in the first hole. The other end of the pull rod is fixed on the support plate after passing through the second hole. Along the mold opening direction, the thickness of the boss is less than the length of the first hole, and the spacing of the first parting is less than or equal to the spacing of the pull rod movement.

7. The injection mold structure of the housing with 0° draft and leather grain appearance according to claim 1, characterized in that: A nylon buckle is installed on the B plate, and the nylon buckle is interference fit with the corresponding hole on the A plate.

Images