Injection molding mold for plastic part with barb side slip and inward retraction

Abstract

The application relates to a plastic part barb side sliding inward injection molding mold, which comprises a cavity mold, a core mold and a reverse buckle core pulling mechanism. The reverse buckle core pulling mechanism comprises a main core pulling top block, an auxiliary core pulling block, a first sliding block, a driving assembly and an elastic piece. The driving assembly drives the main core pulling top block to slide along the inclined composite direction of ejection and core pulling. The first sliding block is detachably connected with the auxiliary core pulling block and slides in the sliding groove of the main core pulling top block. The core pulling directions of the main core pulling top block and the auxiliary core pulling block are acute angles, and the elastic piece drives the auxiliary core pulling block to move towards the plastic part. A molding insert is arranged in the cavity mold. When the main core pulling top block moves to the core combining state, the auxiliary core pulling block abuts against the molding insert. In the demolding process, when demolding, the main core pulling top block moves, the auxiliary core pulling block moves obliquely towards the plastic part and shrinks inward to separate from the second reverse buckle under the action of the elastic piece, and then the main core pulling top block drives the auxiliary core pulling block to synchronously pull the core, so that smooth demolding is realized.

Description

Technical Field

[0001] This utility model relates to the field of molds, and in particular to a plastic part barbed side sliding inward injection molding mold. Background Technology

[0002] Plastic parts such as Figure 1 As shown, the plastic part 6 includes a body with several first undercuts 61. The bottom ends of the first undercuts 61 extend outward to form extensions 62, and the extensions 62 have second undercuts 63. The presence of the second undercuts 63 can easily cause damage to the extensions 62 during demolding of the conventional first slider 23 structure, thereby causing local damage to the plastic part 6. Utility Model Content

[0003] To facilitate demolding of the undercut portion of the plastic part, this application provides a plastic part undercut side sliding inward injection molding mold.

[0004] The technical solution of the plastic part barbed side sliding inward injection molding die provided in this application is as follows:

[0005] A plastic part undercut side sliding inward injection molding mold includes a cavity mold, a core mold and an undercut core pulling mechanism. The undercut core pulling mechanism includes a main core pulling block, an auxiliary core pulling block, a first slider, a driving component and an elastic element. The driving component is disposed in the cavity mold and is used to drive the main core pulling block to slide along an inclined composite direction of the ejection direction and the core pulling direction. The main core pulling block is used to form the upper half of the inner surface of the first undercut.

[0006] The first slider is detachably connected to the auxiliary core-pulling block. The main core-pulling top block has a sliding groove. The first slider is slidably connected to the sliding groove along the core-pulling direction of the auxiliary core-pulling block. The auxiliary core-pulling block is used to form the lower half of the inner surface of the first undercut and the inner surface of the extension. The core-pulling direction of the main core-pulling top block and the core-pulling direction of the auxiliary core-pulling block form an acute angle. The elastic element is disposed between the main core-pulling top block and the auxiliary core-pulling block and is used to drive the auxiliary core-pulling block to move toward the plastic part before the extension completely leaves the core-pulling path of the auxiliary core-pulling block.

[0007] A molding insert is installed inside the cavity mold. The molding insert is used to form the outer surface of the first undercut and the outer surface of the extension. When the main core-pulling top block moves to the core-closing state, the auxiliary core-pulling block abuts against the molding insert.

[0008] By adopting the above technical solution, during the demolding process, the drive component can drive the main core-pulling block to slide along the inclined composite direction of ejection and core pulling. At the same time, under the action of the elastic element, the auxiliary core-pulling block can always tilt and move towards the plastic part, pressing against the plastic part. Since the main core-pulling block and the direction of movement of the auxiliary core-pulling block form an acute angle difference, as the main core-pulling block moves, the auxiliary core-pulling block will retract inward, thereby disengaging from the second undercut. Finally, when the auxiliary core-pulling block completely disengages from the second undercut, the main core-pulling block will drive the auxiliary core-pulling block to pull the core synchronously, thereby achieving smooth demolding of the plastic part at the undercut.

[0009] Preferably, the auxiliary core-pulling block has a mounting groove on the side away from the plastic part that is interference-fitted with the end of the first slider, one end of the first slider is inserted into the mounting groove, and the top wall of the first slider is flush with the top wall of the auxiliary core-pulling block.

[0010] By adopting the above technical solution, the first slider and the auxiliary core-pulling block are connected by an interference fit, which not only ensures the stability of the connection between the two and ensures synchronous action during the core-pulling process, but also facilitates the disassembly and replacement of the first slider. When the first slider wears out due to long-term use, it can be quickly maintained, thus improving the ease of use and lifespan of the mold.

[0011] Preferably, the first slider is a T-shaped first slider.

[0012] By adopting the above technical solution, the structural design of the T-shaped first slider can form a more stable sliding fit with the groove of the main core-pulling top block, which limits the offset of the first slider during the sliding process, ensures the accuracy of the core-pulling direction, and enhances the force-bearing capacity of the first slider during core pulling, avoiding deformation or damage due to excessive force.

[0013] Preferably, the elastic element includes a spring and a locking screw. The auxiliary core-pulling block and the main core-pulling top block have grooves on their opposite sides. The spring is located in the grooves, and the two ends of the spring abut against the bottom walls of the two grooves. The bottom wall of the groove of the main core-pulling top block has a through hole. The bottom wall of the groove of the auxiliary core-pulling block has a threaded groove. One end of the locking screw passes through the through hole and the spring and is threaded into the threaded groove.

[0014] By adopting the above technical solution, the spring provides continuous elastic force, which can drive the auxiliary core-pulling block to maintain its contact with the plastic part in the early stage of demolding. The locking screw plays a limiting and fixing role for the spring, preventing the spring from falling off during the extension and contraction process. The end of the locking screw can abut against the main core-pulling top block to limit the extreme position of the auxiliary core-pulling block's outward movement. This structure not only realizes the elastic drive of the auxiliary core-pulling block, but also ensures the stability of the elastic component installation, ensuring the reliable demolding action.

[0015] Preferably, the main core pull block has a countersunk groove on the side away from the plastic part, and the end of the locking screw moves within the countersunk groove.

[0016] By adopting the above technical solution, the countersunk groove allows the locking screw end to be hidden inside the main core-pulling block, avoiding the locking screw end from protruding and affecting the sliding of the main core-pulling block, preventing interference with the internal structure of the cavity mold, ensuring the smooth sliding of the main core-pulling block in the compound direction, and improving the coordination of mold movements.

[0017] Preferably, a slot is provided on the bottom wall of the first slider, and a T-shaped groove is provided on the auxiliary core-pulling block. The two ends of the T-shaped groove are respectively connected to the mounting groove and the threaded groove. A T-shaped block slides in the T-shaped groove. One end of the T-shaped block extends toward the slot to form an insert that mates with the slot. The bottom end of the T-shaped block is tapered and can extend into the threaded groove. When the locking screw is tightened in the threaded groove, the insert is inserted into the slot.

[0018] By adopting the above technical solution, when the locking screw is tightened, the T-block is pushed by the locking screw, and the insert can be inserted into the slot of the first slider, which further strengthens the connection strength between the first slider and the auxiliary core-pulling block and prevents the two from separating due to force during the core-pulling process; at the same time, the tapered bottom design of the T-block ensures that the T-block can be smoothly pushed to move during the tightening of the locking screw. This double fixing structure improves the reliability of the connection between the first slider and the auxiliary core-pulling block; to disassemble the slider, the auxiliary core-pulling block must be disassembled first. Therefore, setting the insert and slot to be disassembled at the same time as the auxiliary core-pulling block can reduce the steps of disassembling the slider and the auxiliary core-pulling block separately.

[0019] Preferably, the driving assembly includes a driving cylinder, a push rod, a top plate, a slide block, and a second slider. The two ends of the push rod are respectively fixedly mounted on the main core-pulling block and the second slider. The push rod slides within the cavity mold along the moving direction of the main core-pulling block. The slide block is fixedly mounted on the top plate. The second slider slides on the slide block along the tilting direction of the core-pulling process. The top plate is located on the side of the cavity mold away from the core mold. The driving cylinder is used to drive the top plate to slide along the mold opening and closing direction.

[0020] By adopting the above technical solution, the driving cylinder drives the top plate to move. Through the transmission of the slide block and the second slider, the main core pulling block slides along the composite direction. The driving component has a compact structure and can stably provide driving force, ensuring that the main core pulling block moves accurately along the preset trajectory, and providing power guarantee for the smooth operation of the inverted core pulling mechanism.

[0021] The main technical effects of this utility model are reflected in the following aspects:

[0022] 1. In the demolding process of this utility model, the driving component can drive the main core-pulling block to slide along the inclined composite direction of ejection and core pulling. At the same time, under the action of the elastic element, the auxiliary core-pulling block can always tilt and move towards the plastic part and press against the plastic part. Since the main core-pulling block and the direction of movement of the auxiliary core-pulling block form an acute angle difference, as the main core-pulling block moves, the auxiliary core-pulling block will retract inward, thereby disengaging from the second undercut. Finally, when the auxiliary core-pulling block is completely disengaged from the second undercut, the main core-pulling block will drive the auxiliary core-pulling block to pull the core synchronously, thereby achieving smooth demolding of the plastic part at the undercut.

[0023] 2. The first slider and the auxiliary core-pulling block of this utility model are connected by an interference fit, which not only ensures the stability of the connection between the two and ensures synchronous action during the core-pulling process, but also facilitates the disassembly and replacement of the first slider. When the first slider wears out due to long-term use, it can be quickly maintained, which improves the convenience of use and service life of the mold. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of the plastic part of this application.

[0025] Figure 2 This is a schematic diagram of the overall structure of an embodiment of this application.

[0026] Figure 3 This is a schematic diagram of the structure of the plastic part before core pulling, the cavity mold, and the main core pulling top block in an embodiment of this application.

[0027] Figure 4 This is a schematic diagram of the inverted core-pulling mechanism in an embodiment of this application.

[0028] Figure 5 It is along Figure 4 A cross-sectional view along line AA in the middle.

[0029] Figure 6 yes Figure 5 Enlarged view of point B in the middle.

[0030] Figure 7 This is a schematic diagram of the structure of the main core-pulling top block and the auxiliary core-pulling block in an embodiment of this application.

[0031] Figure 8 This is a cross-sectional view of the core-pulling state in an embodiment of this application.

[0032] Explanation of reference numerals in the attached drawings: 11. Cavity mold; 111. Molding insert; 12. Core mold; 2. Undercut core-pulling mechanism; 21. Main core-pulling top block; 211. Countersunk groove; 212. Slide groove; 22. Auxiliary core-pulling block; 221. Mounting groove; 222. T-slot; 23. First slider; 231. Slot; 24. Groove; 241. Threaded groove; 242. Through hole; 3. Drive assembly; 32. Top rod; 33. Top plate; 34. Slide block; 35. Second slider; 4. Elastic element; 41. Spring; 42. Locking screw; 5. T-block; 51. Insert block; 6. Plastic part; 61. First undercut; 62. Extension; 63. Second undercut. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 2-8 This application will be described in further detail to make the technical solution of this application easier to understand and master.

[0034] This application discloses a plastic part barbed side sliding inward injection molding mold.

[0035] Reference Figures 2-6 The plastic part undercut side sliding inward injection molding mold of this embodiment includes a cavity mold 11, a core mold 12 and an undercut core pulling mechanism 2. The undercut core pulling mechanism 2 includes a main core pulling top block 21, an auxiliary core pulling block 22, a first slider 23, a driving assembly 3 and an elastic element 4. The driving assembly 3 is disposed in the cavity mold 11 and is used to drive the main core pulling top block 21 to slide along an inclined composite direction of the ejection direction and the core pulling direction. The main core pulling top block 21 is used to form the upper half of the inner surface of the first undercut 61.

[0036] Reference Figures 4-6 The first slider 23 is detachably connected to the auxiliary core-pulling block 22. The main core-pulling top block 21 has a groove 212. The first slider 23 is slidably connected to the groove 212 along the core-pulling direction of the auxiliary core-pulling block 22. The auxiliary core-pulling block 22 is used to form the lower half of the inner surface of the first undercut 61 and the inner surface of the extension 62. The core-pulling direction of the main core-pulling top block 21 and the core-pulling direction of the auxiliary core-pulling block 22 form an acute angle. The elastic element 4 is disposed between the main core-pulling top block 21 and the auxiliary core-pulling block 22. It is used to drive the auxiliary core-pulling block 22 to move toward the plastic part 6 before the extension 62 is completely separated from the core-pulling path of the auxiliary core-pulling block 22.

[0037] Reference Figures 3-5 A molding insert 111 is installed inside the cavity mold. The molding insert 111 is used to mold the outer surface of the first undercut 61 and the outer surface of the extension 62. When the main core-pulling top block 21 moves to the core-closing state, the auxiliary core-pulling block 22 abuts against the molding insert 111.

[0038] Reference Figures 4-8During the demolding process, the drive component 3 can drive the main core-pulling block 21 to slide along the inclined composite direction of ejection and core pulling. At the same time, under the action of the elastic element 4, the auxiliary core-pulling block 22 can always tilt and move towards the plastic part 6 and press against the plastic part 6. Since the main core-pulling block 21 and the direction of movement of the auxiliary core-pulling block 22 form an acute angle difference, as the main core-pulling block 21 moves, the auxiliary core-pulling block 22 will retract inward, thereby disengaging from the second undercut 63. Finally, when the auxiliary core-pulling block 22 is completely disengaged from the second undercut 63, the main core-pulling block 21 will drive the auxiliary core-pulling block 22 to pull the core synchronously, thereby achieving smooth demolding of the undercut of the plastic part 6.

[0039] Reference Figures 4-8 The auxiliary core-pulling block 22 has a mounting groove 221 on the side away from the plastic part 6, which is interference-fitted with the end of the first slider 23. One end of the first slider 23 is inserted into the mounting groove 221, and the top wall of the first slider 23 is flush with the top wall of the auxiliary core-pulling block 22.

[0040] Reference Figures 4-8 The first slider 23 and the auxiliary core-pulling block 22 are connected by an interference fit, which not only ensures the stability of the connection between the two and ensures synchronous action during the core-pulling process, but also facilitates the disassembly and replacement of the first slider 23. When the first slider 23 wears out due to long-term use, it can be quickly maintained, which improves the ease of use and life of the mold.

[0041] Reference Figures 4-8 The first slider 23 is a T-shaped first slider 23. The structural design of the T-shaped first slider 23 can form a more stable sliding fit with the groove 212 of the main core pulling block 21, which limits the offset of the first slider 23 during the sliding process, ensures the accuracy of the core pulling direction, and enhances the force-bearing capacity of the first slider 23 during core pulling, avoiding deformation or damage due to excessive force.

[0042] Reference Figures 4-8 The elastic element 4 includes a spring 41 and a locking screw 42. The auxiliary core-pulling block 22 and the main core-pulling top block 21 have grooves 24 on their opposite sides. The spring 41 is located in the groove 24, and the two ends of the spring 41 abut against the bottom walls of the two grooves 24 respectively. The bottom wall of the groove 24 of the main core-pulling top block 21 has a through hole 242, and the bottom wall of the groove 24 of the auxiliary core-pulling block 22 has a threaded groove 241. One end of the locking screw 42 passes through the through hole 242 and the spring 41 and is threaded into the threaded groove 241.

[0043] Reference Figures 4-8The spring 41 provides a continuous elastic force, which can drive the auxiliary core-pulling block 22 to maintain its contact with the plastic part 6 in the early stage of demolding. The locking screw 42 plays a limiting and fixing role for the spring 41, preventing the spring 41 from falling off during the extension and contraction process. The end of the locking screw 42 can abut against the main core-pulling top block 21 to limit the extreme position of the auxiliary core-pulling block 22's outward movement. This structure not only realizes the elastic drive of the auxiliary core-pulling block 22, but also ensures the stability of the elastic element 4's installation, ensuring the reliable demolding action.

[0044] Reference Figure 6 and Figure 8 The main core puller 21 has a countersunk groove 211 on the side away from the plastic part 6, and the end of the locking screw 42 moves in the countersunk groove 211.

[0045] Reference Figure 6 and Figure 8 The countersunk groove 211 allows the end of the locking screw 42 to be hidden inside the main core-pulling block 21, preventing the end of the locking screw 42 from protruding and affecting the sliding of the main core-pulling block 21, preventing interference with the internal structure of the cavity mold 11, ensuring the smooth sliding of the main core-pulling block 21 in the compound direction, and improving the coordination of mold movements.

[0046] Reference Figures 4-8 The first slider 23 has a slot 231 on its bottom wall and the auxiliary core-pulling block 22 has a T-shaped groove 222. The two ends of the T-shaped groove 222 are connected to the mounting groove 221 and the threaded groove 241, respectively. A T-shaped block 5 slides in the T-shaped groove 222. The end of the T-shaped block 5 facing the slot 231 extends to form an insert 51 that mates with the slot 231. The bottom end of the T-shaped block 5 is tapered and can extend into the threaded groove 241. When the locking screw 42 is tightened in the threaded groove 241, the insert 51 is inserted into the slot 231.

[0047] Reference Figures 4-8 When the locking screw 42 is tightened, the T-block 5 is pushed by the locking screw 42, and the insert 51 can be inserted into the slot 231 of the first slider 23, which further strengthens the connection between the first slider 23 and the auxiliary core-pulling block 22 and prevents the two from separating due to force during the core-pulling process. At the same time, the reduced bottom design of the T-block 5 ensures that the T-block 5 can be smoothly pushed to move during the tightening of the locking screw 42. This double fixing structure improves the reliability of the connection between the first slider 23 and the auxiliary core-pulling block 22. To disassemble the slider, the auxiliary core-pulling block 22 must be disassembled first. Therefore, setting the insert 51 and slot 231 to be disassembled at the same time as the auxiliary core-pulling block 22 can reduce the steps of disassembling the slider from the auxiliary core-pulling block 22 alone.

[0048] Reference Figures 4-8The drive assembly 3 includes a drive cylinder, a push rod 32, a top plate 33, a slide block 34, and a second slider 35. The two ends of the push rod 32 are fixedly mounted on the main core-pulling block 21 and the second slider 35 by screws, respectively. The push rod 32 slides in the cavity mold 11 along the moving direction of the main core-pulling block 21. The slide block 34 is fixedly mounted on the top plate 33. The second slider 35 slides on the slide block 34 along the inclined direction of core pulling. The top plate 33 is located on the side of the cavity mold 11 away from the core mold 12. The drive cylinder is mounted on the cavity mold 11 and is used to drive the top plate 33 to slide along the mold opening and closing direction.

[0049] Reference Figures 4-8 The drive cylinder drives the top plate 33 to move. Through the transmission of the slide block 34 and the second slider 35, the main core pulling block 21 slides along the composite direction. The drive assembly 3 has a compact structure and can stably provide driving force, ensuring that the main core pulling block 21 moves accurately along the preset trajectory, and providing power guarantee for the smooth operation of the inverted core pulling mechanism 2.

[0050] Reference Figure 4 There are multiple inverted core-pulling mechanisms 2, but the top plate 33 in multiple inverted core-pulling mechanisms 2 is the same top plate 33.

[0051] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. A plastic part barbed side-sliding inward-retracting injection molding die, characterized in that: The mold includes a cavity mold (11), a core mold (12), and a backdated core-pulling mechanism (2). The backdated core-pulling mechanism (2) includes a main core-pulling top block (21), an auxiliary core-pulling block (22), a first slider (23), a driving assembly (3), and an elastic element (4). The driving assembly (3) is disposed in the cavity mold (11) and is used to drive the main core-pulling top block (21) to slide along the inclined composite direction of the ejection direction and the core-pulling direction. The main core-pulling top block (21) is used to form the upper half of the inner surface of the first backdated part (61). The first slider (23) is detachably connected to the auxiliary core-pulling block (22). The main core-pulling top block (21) has a groove (212) inside. The first slider (23) is slidably connected to the groove (212) along the core-pulling direction of the auxiliary core-pulling block (22). The auxiliary core-pulling block (22) is used to form the lower half of the inner surface of the first undercut (61) and the inner surface of the extension (62). The core-pulling direction of the main core-pulling top block (21) and the core-pulling direction of the auxiliary core-pulling block (22) form an acute angle. The elastic element (4) is disposed between the main core-pulling top block (21) and the auxiliary core-pulling block (22) and is used to drive the auxiliary core-pulling block (22) to move toward the plastic part (6) before the extension (62) completely leaves the core-pulling path of the auxiliary core-pulling block (22). A molding insert (111) is installed inside the cavity mold. The molding insert (111) is used to form the outer surface of the first undercut (61) and the outer surface of the extension (62). When the main core-pulling top block (21) moves to the core-closing state, the auxiliary core-pulling block (22) abuts against the molding insert (111).

2. The plastic part barbed side-sliding inward injection molding die according to claim 1, characterized in that: The auxiliary core-pulling block (22) has a mounting groove (221) on the side away from the plastic part (6) that is interference-fitted with the end of the first slider (23). One end of the first slider (23) is inserted into the mounting groove (221), and the top wall of the first slider (23) is flush with the top wall of the auxiliary core-pulling block (22).

3. The plastic part barbed side-sliding inward injection molding die according to claim 2, characterized in that: The first slider (23) is a T-shaped first slider (23).

4. The plastic part barbed side-sliding inward injection molding die according to claim 2, characterized in that: The elastic element (4) includes a spring (41) and a locking screw (42). The auxiliary core-pulling block (22) has grooves (24) on the side opposite to the main core-pulling top block (21). The spring (41) is located in the groove (24). The two ends of the spring (41) abut against the bottom walls of the two grooves (24). The bottom wall of the groove (24) of the main core-pulling top block (21) has a through hole (242). The bottom wall of the groove (24) of the auxiliary core-pulling block (22) has a threaded groove (241). One end of the locking screw (42) passes through the through hole (242) and the spring (41) and is threaded into the threaded groove (241).

5. The plastic part barbed side-sliding inward injection molding die according to claim 4, characterized in that: The main core pull block (21) has a countersunk groove (211) on the side away from the plastic part (6), and the end of the locking screw (42) moves within the countersunk groove (211).

6. The plastic part barbed side-sliding inward injection molding die according to claim 4, characterized in that: The first slider (23) has a slot (231) on its bottom wall and the auxiliary core-pulling block (22) has a T-shaped groove (222). The two ends of the T-shaped groove (222) are connected to the mounting groove (221) and the threaded groove (241) respectively. A T-shaped block (5) slides in the T-shaped groove (222). The end of the T-shaped block (5) facing the slot (231) extends to form an insert (51) that mates with the slot (231). The bottom end of the T-shaped block (5) is tapered and can extend into the threaded groove (241). When the locking screw (42) is tightened in the threaded groove (241), the insert (51) is inserted into the slot (231).

7. The plastic part barbed side-sliding inward injection molding die according to claim 1, characterized in that: The drive assembly (3) includes a drive cylinder, a push rod (32), a top plate (33), a slide block (34), and a second slider (35). The two ends of the push rod (32) are respectively fixedly installed on the main core-pulling block (21) and the second slider (35). The push rod (32) slides in the cavity mold (11) along the moving direction of the main core-pulling block (21). The slide block (34) is fixedly installed on the top plate (33). The second slider (35) slides on the slide block (34) along the inclined direction of core pulling. The top plate (33) is located on the side of the cavity mold (11) away from the core mold (12). The drive cylinder is used to drive the top plate (33) to slide along the mold opening and closing direction.

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