A demolding anti-deformation injection molding structure

Abstract

This utility model discloses an injection molding structure for preventing deformation during demolding, relating to the field of injection mold technology. It includes an upper mold base and a lower mold base that are connected to each other. The upper mold base has an upper module with an upper tube body groove, and the lower mold base has a lower module with a lower tube body groove. The lower mold base has a sliding block 1 and a sliding block 2, and the upper mold base has an inclined guide groove. Both sliding blocks 1 and 2 have tube body inserts, and one side of sliding block 2 has a fixing groove. An ejection mechanism is located at the lower end of the lower mold base. The ejection mechanism includes a top plate located at the lower end of the lower mold base, a push rod on the top plate, and a push block 1 that acts on the lower tube body groove and a push block 2 that simultaneously acts on the edge of the lower tube body groove and the fixing groove. The upper surface of push block 1 has an arc-shaped structure, which can prevent local deformation and whitening of the tube body during demolding, and prevent deformation at the connection between the tube body and the fixing part.

Description

Technical Field

[0001] This utility model relates to the field of injection mold technology, and in particular to an injection molding structure that prevents deformation during demolding. Background Technology

[0002] Injection molding is a method of industrial product manufacturing. Products are typically made using rubber or plastic injection molding. Injection molding can be further divided into compression molding and die casting. An injection molding machine (or simply injection molding machine) is the main molding equipment used to create various shapes of plastic products from thermoplastic or thermosetting materials using plastic molds. Injection molding is achieved through an injection molding machine and a mold. An injection mold is a tool used to produce plastic products. Generally, an injection mold consists of an upper mold and a lower mold. During injection molding, the upper and lower molds close to form the runner system and the cavity of the plastic product. During injection, the mold is clamped on the injection molding machine, and molten plastic is injected into the mold cavity and cooled and solidified within the cavity. Simultaneously, the molten plastic also cools and solidifies in the runner system. After the plastic product is formed, the upper and lower molds separate, and the plastic product is ejected from the mold cavity via the ejection system. Finally, the upper and lower molds close again for the next injection molding cycle. The entire injection molding process is cyclical.

[0003] like Figure 1 The product shown is a curved tube component for automobiles. The product includes a curved tube body and threaded portions at both ends of the tube body for connecting different pipes and components, and a fixing portion for fixing. When the product is injection molded and demolded after cooling, because the tube body is circular, the ejector pins of the traditional ejection mechanism cannot be adapted to the tube body. During ejection, the force on the tube body is too concentrated, resulting in local deformation and whitening, causing product defects. Furthermore, during the ejection and demolding process, due to the height difference between the tube body and the fixing portion, the fixing portion cannot be subjected to force synchronously when the ejector pin pushes the tube body, resulting in stress concentration at the connection between the tube body and the fixing portion, causing tensile deformation at the connection.

[0004] Therefore, it is necessary to propose a new technical solution to address the above problems. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model aims to provide a technical solution that can solve the aforementioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a demolding and deformation-resistant injection molding structure, comprising an upper mold base and a lower mold base that are connected to each other, wherein an upper module is provided on the upper mold base and the upper module has an upper tube groove, and a lower module is provided on the lower mold base and the lower module has a lower tube groove;

[0007] The lower mold base is provided with two sliding blocks and one sliding block. The upper mold base is also provided with inclined guide grooves that match sliding blocks one and sliding blocks two. Sliding blocks one and sliding blocks two are each provided with tube inserts, and a fixing groove is provided on one side of sliding block two. The fixing groove can be connected with the upper tube groove and the lower tube groove to form a complete cavity.

[0008] The lower end of the lower mold base is provided with an ejection mechanism. The ejection mechanism includes a top plate provided at the lower end of the lower mold base. The top plate is provided with a plurality of ejector rods. Each of the ejector rods is connected to a first ejector block that acts on the lower tube groove and a second ejector block that acts on both the edge of the lower tube groove and the fixing groove. The upper end face of the first ejector block is arc-shaped and fits into the groove wall of the lower tube groove with a matching arc. One side of the second ejector block fits into the edge of the lower tube groove, and the other side fits into one side of the sliding block, with the shape of its upper end face matching the shape of the lower end face of the fixing groove.

[0009] As a further embodiment of this utility model: the lower mold base has a first sliding groove and a second sliding groove suitable for the first sliding block and the second sliding block, and the first sliding block is guided and disposed in the first sliding groove, and the second sliding block is guided and disposed in the second sliding groove.

[0010] As a further embodiment of this utility model: the lower tube groove is provided with a fitting groove 1 on one side edge near the sliding groove 2, the sliding block 2 is provided with a fitting groove 2 on one side that communicates with the fixing part groove, and the top block 2 includes an edge part 1 that fits into the fitting groove 1 and an edge part 2 that can fit into the fitting groove 2.

[0011] The second edge portion is located in the second row groove and fits against the edge of the lower module, and the lower wall of the second row groove has a slot corresponding to the first edge portion and the second edge portion.

[0012] As a further embodiment of this utility model: a threaded forming part is provided on the lower tube groove, and a fitting groove three is opened on the lower tube groove located in the threaded forming part. The top block one is fitted into the fitting groove three, and the top of the top block one has a texture that matches the threaded forming part.

[0013] As a further embodiment of this utility model: the lower mold base is provided with several through holes, which are respectively connected to the slot and the fitting groove three, and several push rods pass through the through holes and extend into the fitting groove three and the slot, and are connected to the top block one and the top block two.

[0014] Compared with the prior art, the beneficial effects of this technical solution are as follows: The top plate pushes the top block one and the top block two through the top rod. At this time, the top block one pushes the tube body of the bent tube. Since the upper end face of the top block one has an arc-shaped structure that matches the tube body, the upper force during the ejection demolding process is evenly applied to the tube body, avoiding the upper force being concentrated at the lower end of the tube body, which would lead to local deformation and whitening. The upper force of the top block two is applied to the edge part and the fixed part of the tube body at the same time, so that the fixed part and the tube body are subjected to force at the same time, avoiding stress concentration at the connection between the tube body and the fixed part during the demolding process, and preventing deformation at the connection between the tube body and the fixed part.

[0015] In summary, this utility model, by setting an arc-shaped top block one to push the tube body, and by setting a top block two that can simultaneously act on the edge of the tube body and the fixed part, ensures that the tube body and the fixed part are subjected to uniform upward force during demolding, which can avoid local deformation and whitening of the tube body, as well as avoid deformation at the connection between the tube body and the fixed part.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the product structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure 3 This is a structural diagram of the lower mold base of this utility model when the lower module is loaded;

[0021] Figure 4 This is a schematic diagram of the upper mold base of this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the lower mold base of this utility model;

[0023] Figure 6 This is a schematic diagram of the cooperative relationship between the ejection mechanism and the lower module of this utility model;

[0024] Figure 7 This is a schematic diagram of the ejection mechanism of this utility model;

[0025] The corresponding labels in the attached diagram are explained as follows:

[0026] 1. Upper mold base; 11. Inclined guide groove; 2. Lower mold base; 21. Slide groove one; 22. Slide groove two; 23. Groove opening; 24. Through hole; 3. Upper module; 31. Upper tube body groove; 4. Lower module; 41. Lower tube body groove; 42. Fitting groove one; 43. Thread forming part; 44. Fitting groove three; 5. Slide block one; 6. Slide block two; 61. Fixing part groove; 62. Fitting groove two; 7. Tube body insert; 8. Ejection mechanism; 81. Top plate; 82. Ejector rod; 83. Ejector block one; 84. Ejector block two; 841. Edge part one; 842. Edge part two. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Please see Figure 1-7 A demolding and deformation-resistant injection molding structure includes an upper mold base 1 and a lower mold base 2 that are connected to each other. An upper module 3 is provided on the upper mold base 1, and the upper module 3 has an upper tube groove 31. A lower module 4 is provided on the lower mold base 2, and the lower module 4 has a lower tube groove 41.

[0029] The lower mold base 2 is provided with two sliding blocks 5 and one sliding block 6. The upper mold base 1 is also provided with a slanted guide groove 11 that matches the sliding blocks 5 and 6. The sliding blocks 5 and 6 each have a guide slope corresponding to the slanted guide groove 11. The sliding blocks 5 and 6 each have a tube insert 7. The sliding block 6 has a fixing groove 61 on one side. The fixing groove 61 can be connected with the upper tube groove 31 and the lower tube groove 41 to form a complete cavity.

[0030] After the bent tube product cools down in the cavity, the upper mold base 1 and the lower mold base 2 separate, and at the same time, the sliding block 5 and the sliding block 6 are reset, so that the bent tube product is completely placed in the lower tube groove 41. Preferably, an elastic reset mechanism (not shown in the figure) is provided between the sliding block 5 and the sliding block 6 and the lower mold base 2. That is, the sliding block 5 and the sliding block 6 are pushed by the spring to move and reset laterally. This is an existing mature technology and will not be described in detail here.

[0031] The upper mold base 1 and the lower mold base 2 are designed to be docked, and a guide rod (not shown in the figure) should be provided between the upper mold base 1 and the lower mold base 2 to guide the upper mold base 1 to move and close with the lower mold base 2. The upper mold base 1 is clamped on the injection molding machine. During injection molding, the injection molding machine injects molten plastic into the cavity composed of the upper tube groove 31, the lower tube groove 41, and the fixing part groove 61 through the injection port of the upper mold base 1, and cools and solidifies in the cavity. The upper mold base 1 and the lower mold base 2 are closed. During the process, the inclined guide groove 11 in the upper mold base 1 cooperates with the guide inclined surfaces on the sliding block 5 and the sliding block 6, so that the sliding block 5 and the sliding block 6 move laterally, and the tube insert 7 on the sliding block 5 and the sliding block 6 docks in the lower tube groove 41 to form the complete inner cavity of the bent tube product. At the same time, the fixing groove 61 on one side of the sliding block 6 docks with the lower tube groove 41 and the upper tube groove 31 to form a complete cavity for forming the bent tube product.

[0032] The lower mold base 2 is provided with an ejection mechanism 8. The ejection mechanism 8 includes a top plate 81 provided at the lower end of the lower mold base 2. The top plate 81 is provided with a plurality of ejector rods 82. The plurality of ejector rods 82 are respectively connected to an ejector block 1 83 that acts on the lower tube groove 41 and an ejector block 2 84 that acts on the edge of the lower tube groove 41 and the fixing part groove 61. The upper end face of the ejector block 1 83 is provided with an arc-shaped structure and is fitted into the groove wall of the lower tube groove 41 with the arc matching it. One side of the ejector block 2 84 is fitted into the edge of the lower tube groove 41, and the other side is fitted into the side of the sliding block 2 6, and the shape of the upper end face matches the shape of the lower end face of the fixing part groove 61.

[0033] Specifically, after the upper mold base 1 and the lower mold base 2 are separated, the lower mold base 2 is externally connected to an ejection power hydraulic cylinder or pneumatic push rod. Its telescopic rod passes through the bottom plate of the lower mold base 2 and is fixed to the top plate 81. Then, the top plate 81 is pushed upward. The top plate 81 pushes the first ejector block 83 and the second ejector block 84 through the ejector rod 82. At this time, the first ejector block 83 pushes the tube body of the bent tube. Since the upper end face of the first ejector block 83 has an arc-shaped structure that matches the tube body, the upward force during the ejection demolding process is evenly applied to the tube body, avoiding the upward force being concentrated at the lower end of the tube body, which would lead to local deformation and whitening. The upward force of the second ejector block 84 acts on the edge part and the fixed part of the tube body at the same time, so that the fixed part and the tube body are subjected to force at the same time, avoiding stress concentration at the connection between the tube body and the fixed part during the demolding process, and preventing deformation at the connection between the tube body and the fixed part.

[0034] Among them, the upper end face of the part of the top block 84 that acts on the tube body has an arc-shaped structure that matches the tube body, and the shape of the upper end face that acts on the fixing part matches the shape of the fixing part. Therefore, it can stably support the tube body and the fixing part, and make the upward force on the edge of the tube body and the fixing part evenly distributed.

[0035] In summary, by setting an arc-shaped top block 83 to push the tube body, and by setting a top block 84 that can simultaneously act on the edge of the tube body and the fixed part, the tube body and the fixed part can be subjected to uniform upward force during demolding, which can avoid local deformation and whitening of the tube body, as well as deformation at the connection between the tube body and the fixed part.

[0036] Based on the above embodiments, it is further proposed that the lower mold base 2 has a sliding groove 21 and a sliding groove 22 suitable for sliding block 5 and sliding block 6, and the sliding block 5 is guided and disposed in the sliding groove 21, and the sliding block 6 is guided and disposed in the sliding groove 22.

[0037] Specifically, the row block 5 can be guided to move through the row slot 21, and the row block 6 can be guided to move through the row slot 22.

[0038] Based on the above embodiments, it is further proposed that a fitting groove 42 is provided on one side edge of the lower tube groove 41 near the second sliding groove 22, and a fitting groove 62 connected to the fixing part groove 61 is provided on one side of the second sliding block 6. The second top block 84 includes an edge part 841 that fits into the fitting groove 42 and an edge part 842 that can fit into the fitting groove 62.

[0039] Among them, edge portion 2 842 is located in row groove 22 and fits against the edge of lower module 4, and the lower wall of row groove 22 is provided with slot 23 corresponding to edge portion 1 841 and edge portion 2 842.

[0040] Specifically, the top block 2 84 is divided into edge part 1 841 and edge part 2 842. Edge part 1 841 is fitted into the fitting groove 1 42 opened at the edge of the lower tube groove 41, and is tightly fitted with the groove wall of the lower tube groove 41 to avoid glue leakage. At the same time, when the slide block 2 6 moves laterally to allow the fixing groove 61 to align with the lower tube groove 41 during mold closing, edge part 2 842 is fitted into the fitting groove 2 62 opened on one side of the slide block 2 6 to avoid edge part 2 842 affecting the translation of the slide block 2 6.

[0041] Among them, a slot 23 is opened in the lower wall of the row slot 22 to simultaneously accommodate edge part 841 and edge part 842.

[0042] Based on the above embodiments, it is further proposed that a thread forming part 43 is provided on the lower tube groove 41, and an interlocking groove 3 44 located on the thread forming part 43 is opened on the lower tube groove 41. The top block 1 83 is fitted into the interlocking groove 3 44, and the upper top of the top block 1 83 has a pattern matching the thread forming part 43. Preferably, the upper tube groove 31 has an upper thread forming part corresponding to the thread forming part 43 on the lower tube groove 41, and a complete thread pattern is formed when the mold is closed.

[0043] Specifically, by creating a fitting groove 3 44 in the thread forming part 43 area, and fitting the top block 1 83 into the fitting groove 3 44, and providing a matching texture of the thread forming part 43 on the upper end face of the top block 1 83, the top block 1 83 can perfectly match the texture of the bent pipe thread during the upward process, which can make the uneven thread texture evenly stressed and avoid local deformation, thus preventing problems at the subsequent connection.

[0044] Based on the above embodiments, it is further proposed that the lower mold base 2 is provided with a plurality of through holes 24, which are respectively connected to the slot 23 and the fitting groove 3 44, and a plurality of push rods 82 pass through the through holes 24 and extend into the fitting groove 3 44 and the slot 23, and are connected to the first push block 83 and the second push block 84.

[0045] Specifically, the through hole 24 on the lower mold base 2 corresponds to the ejector rod 82 on the top plate 81. The ejector rod 82 is connected to the first ejector block 83 and the second ejector block 84 in the fitting groove 44 and the slot 23 through the through hole 24, so that the ejector force on the part is transmitted to the first ejector block 83 and the second ejector block 84.

[0046] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A demolding deformation-preventing injection molded structure, characterized by, It includes an upper mold base (1) and a lower mold base (2) that are connected to each other. The upper mold base (1) is provided with an upper module (3) and the upper module (3) has an upper tube groove (31). The lower mold base (2) is provided with a lower module (4) and the lower module (4) has a lower tube groove (41). The lower mold base (2) is provided with two sliding blocks (5) and one sliding block (6). The upper mold base (1) is also provided with an inclined guide groove (11) that matches the sliding blocks (5) and the sliding blocks (6). The sliding blocks (5) and the sliding blocks (6) are both provided with tube inserts (7). The sliding block (6) is provided with a fixing groove (61) on one side. The fixing groove (61) can be connected with the upper tube groove (31) and the lower tube groove (41) to form a complete cavity. The lower mold base (2) is provided with an ejection mechanism (8) at its lower end. The ejection mechanism (8) includes a top plate (81) provided at the lower end of the lower mold base (2). The top plate (81) is provided with a plurality of ejector rods (82). The plurality of ejector rods (82) are respectively connected to a first ejector block (83) that acts on the lower tube groove (41) and a second ejector block (84) that acts on the edge of the lower tube groove (41) and the fixing groove (61). The upper end face of the first ejector block (83) is provided with an arc-shaped structure and is fitted into the groove wall of the lower tube groove (41) with its arc matching. One side of the second ejector block (84) is fitted into the edge of the lower tube groove (41), and the other side is fitted into one side of the second slide block (6) with its upper end face shape matching the shape of the lower end face of the fixing groove (61).

2. The ejection distortion-proof injection molded structure according to claim 1, characterized by, The lower mold base (2) has a first sliding groove (21) and a second sliding groove (22) suitable for the first sliding block (5) and the second sliding block (6), and the first sliding block (5) is guided in the first sliding groove (21), and the second sliding block (6) is guided in the second sliding groove (22).

3. The ejection distortion-proof injection molded structure according to claim 2, characterized by, The lower tube groove (41) has a fitting groove 1 (42) on one side edge near the sliding groove 2 (22), and the sliding block 2 (6) has a fitting groove 2 (62) on one side that communicates with the fixing part groove (61). The top block 2 (84) includes an edge part 1 (841) that fits into the fitting groove 1 (42) and an edge part 2 (842) that can fit into the fitting groove 2 (62). The second edge portion (842) is located in the second row groove (22) and fits against the edge of the lower module (4), and the lower wall of the second row groove (22) is provided with a slot (23) corresponding to the first edge portion (841) and the second edge portion (842).

4. The ejection deformed resistance injection molded structure according to claim 3, wherein, The lower tube groove (41) is provided with a thread forming part (43), and the lower tube groove (41) is provided with a fitting groove three (44) located in the thread forming part (43). The top block one (83) is fitted into the fitting groove three (44), and the top of the top block one (83) has a texture matching the thread forming part (43).

5. The ejection deformed resistance injection molded structure of claim 4, wherein, The lower mold base (2) has several through holes (24), which are connected to the slot (23) and the fitting slot three (44) respectively. Several push rods (82) pass through the through holes (24) and extend into the fitting slot three (44) and the slot (23) and connect with the top block one (83) and the top block two (84).

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