Low-wear injection mold

Abstract

The application relates to the technical field of injection molds, in particular to a low-wear injection mold which comprises a lower mold frame and an upper mold frame; the top of the lower mold frame is provided with a female mold core, the middle part of the female mold core is provided with a cavity, the two sides of the female mold core are slidably provided with sliding blocks, the sliding blocks are rotatably provided with obliquely-arranged inclined guide columns, the top of the inclined guide columns protrudes out of the top of the sliding blocks; the bottom of the upper mold frame is provided with a male mold core, the middle part of the male mold core is provided with a mold block matched with the cavity, the upper mold frame on the two sides of the male mold core is provided with a guide inclined hole, and the guide inclined hole is rotatably provided with a guide sleeve; the low-wear injection mold further comprises a lower driving mechanism and an upper driving mechanism. The lower driving mechanism drives the inclined guide columns to rotate, and the upper driving mechanism drives the guide sleeve to rotate, so that the contact and friction areas of the inclined guide columns and the guide sleeve are continuously changed during the cooperation of the opening and closing of the mold, the friction stress is not always concentrated on the fixed part, and the wear of the mold is reduced.

Description

Technical Field

[0001] This invention relates to the field of injection mold technology, and more specifically to a low-wear injection mold. Background Technology

[0002] In the field of automotive interior parts injection molds, for products with side undercut structures, a core-pulling mechanism driven by inclined guide pillars is commonly used. The inclined guide pillars are assembled on the lower mold frame, and the upper mold frame is equipped with guide sleeves that are compatible with the inclined guide pillars.

[0003] In the existing structure, the inclined guide post and the guide sleeve are rigidly fixed to the upper mold frame and the lower mold frame, respectively, and cannot rotate relative to each other during operation. When the mold undergoes high-frequency mold opening and closing cycles, the force friction area between the outer wall of the inclined guide post and the inner wall of the guide sleeve is always concentrated in the fixed part. Under long-term reciprocating action, local uneven wear and scoring are prone to occur, resulting in increased clearance. This not only reduces the accuracy of the core pulling movement, but also causes the slider to jam and produce quality defects such as flash on the product. The mold needs to be frequently disassembled and inspected for maintenance, which affects production efficiency. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned shortcomings of the prior art by providing a low-wear injection mold.

[0005] The objective of this invention is achieved through the following technical solution: a low-wear injection mold, comprising a lower mold frame and an upper mold frame that is movably and vertically disposed on the top of the lower mold frame; a concave mold core is provided at the top of the lower mold frame; and a convex mold core is provided at the bottom of the upper mold frame; The die core has a cavity in the middle; sliding blocks are slidably provided on both sides of the die core in the horizontal direction; the sliding blocks are rotatably provided with inclined guide posts; the inclined guide posts are inclinedly provided on the sliding blocks; the top of the inclined guide posts protrudes out of the top of the sliding blocks; The punch core has a block in the middle that mates with the cavity; the punch core has guide oblique holes on both sides; and a guide sleeve that mates with the top of the oblique guide post is rotatably installed in the guide oblique hole. The low-wear injection mold also includes a lower drive mechanism for driving the inclined guide post to rotate and an upper drive mechanism for driving the guide sleeve to rotate.

[0006] The present invention is further configured such that the lower drive mechanism includes a sliding shaft, a lower roller, and a trigger groove; the mold core has sliding grooves on both sides; the sliding block is slidably disposed in the sliding groove; the trigger groove is disposed at the bottom of the sliding groove at the end away from the cavity; the sliding shaft is telescopically movably disposed at the bottom of the inclined guide post; the lower roller is rotatably disposed at the bottom of the sliding shaft; the top of the sliding shaft is provided with a drive pin; the bottom of the inclined guide post is provided with a drive groove; and the drive pin is movably disposed in the drive groove.

[0007] The present invention is further configured such that the top wall of the driving groove is provided with a first upper abutting spiral surface and a second upper abutting spiral surface that are alternately connected in sequence along the circumferential direction; the rotation direction of the first upper abutting spiral surface is opposite to that of the second upper abutting spiral surface; an upper abutting groove is formed between the top of the first upper abutting spiral surface and the top of the second upper abutting spiral surface. The bottom wall of the drive groove is provided with a lower abutting spiral surface and a lower abutting vertical surface that are alternately connected in sequence along the circumferential direction; a lower abutting groove is formed between the bottom of the lower abutting spiral surface and the bottom of the lower abutting vertical surface. The lower abutment groove is located at the bottom of the first upper abutment spiral surface; the upper abutment groove is located at the bottom of the lower abutment spiral surface; the rotation direction of the first upper abutment spiral surface is opposite to the rotation direction of the lower abutment spiral surface.

[0008] The present invention is further configured such that a first return spring is provided between the top of the sliding shaft and the inclined guide post; and a second return spring is provided between the end of the sliding block near the cavity and the die core.

[0009] The present invention is further configured such that a transition slope is provided between the sliding groove and the trigger groove.

[0010] The present invention is further configured such that the upper driving mechanism includes a push rod telescopically movably disposed on the punch core; one end of the push rod protrudes into the guide oblique hole; the push rod is movably disposed on one side of the bottom of the guide sleeve; and the outer wall of the bottom of the guide sleeve is provided with a plurality of baffles along the circumferential direction.

[0011] The present invention is further configured such that a third return spring is provided between one end of the push rod and the punch core; and an upper roller is rotatably provided at the other end of the push rod. The upper drive mechanism also includes a trigger rod located at the top of the lower mold frame; the top of the trigger rod is provided with a trigger block; the top and bottom of the trigger block are provided with trigger ramps that cooperate with the upper roller.

[0012] The invention is further configured such that the inner wall of the guide inclined hole is provided with a positioning pin that can be telescopically moved; a fourth return spring is provided between the positioning pin and the inner wall of the guide inclined hole; the outer wall of the top of the guide sleeve is provided with a first positioning inclined surface and a second positioning inclined surface that are alternately connected in sequence along the circumferential direction; the inclination direction of the first positioning inclined surface is opposite to the inclination direction of the second positioning inclined surface; a positioning groove that cooperates with the positioning pin is provided between the first positioning inclined surface and the second positioning inclined surface.

[0013] The present invention is further configured such that a guide post is provided at the top of the lower mold frame; and a guide hole is provided at the bottom of the upper mold frame to cooperate with the guide post.

[0014] The beneficial effects of the present invention are as follows: The present invention drives the inclined guide post to rotate through the lower drive mechanism and drives the guide sleeve to rotate through the upper drive mechanism. This enables the contact friction area between the inclined guide post and the guide sleeve to continuously change with rotation during the mold opening and closing process, avoiding the friction force from always being concentrated in a fixed part. This effectively reduces the risk of local uneven wear and scratches on the inclined guide post and the guide sleeve, reduces mold wear, and extends the service life of the mold. Attached Figure Description

[0015] The invention will be further illustrated with reference to the accompanying drawings, but the embodiments in the drawings do not constitute any limitation on the invention. For those skilled in the art, other drawings can be obtained based on the following drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 yes Figure 2 A magnified view of part A in the middle; Figure 4 This is a schematic diagram of the lower mold frame of the present invention; Figure 5 This is a cross-sectional view of the lower mold frame of the present invention; Figure 6 yes Figure 5 A magnified view of part B in the middle; Figure 7 This is a cross-sectional view of the inclined guide post of the present invention; Figure 8 This is a cross-sectional view of the inclined guide post of the present invention from another perspective; Figure 9 This is a schematic diagram of the upper mold frame of the present invention; Figure 10 yes Figure 9 A magnified view of part C in the middle; Figure 11 This is a schematic diagram of the structure of the positioning pin, guide sleeve, and push rod of the present invention. Wherein: 1. Lower mold frame; 11. Die core; 12. Cavity; 13. Guide post; 2. Upper mold frame; 21. Punch core; 22. Block; 23. Guide hole; 31. Sliding groove; 32. Sliding block; 33. Second return spring; 34. Trigger groove; 35. Transition slope; 4. Inclined guide post; 41. Drive groove; 42. First upper abutting spiral surface; 43. Second upper abutting spiral surface; 44. Upper abutting groove; 45. Lower abutting spiral surface; 46. 1. Lower abutment vertical surface; 47. Lower abutment groove; 5. Guide inclined hole; 51. Positioning pin; 52. Fourth return spring; 6. Guide sleeve; 61. Baffle; 62. First positioning inclined surface; 63. Second positioning inclined surface; 64. Positioning groove; 7. Sliding shaft; 71. Lower roller; 72. Drive pin; 73. First return spring; 8. Push rod; 81. Third return spring; 82. Upper roller; 9. Trigger rod; 91. Trigger block; 92. Trigger inclined surface. Detailed Implementation

[0017] The present invention will be further described in conjunction with the following embodiments.

[0018] Depend on Figures 1 to 11 As can be seen, the low-wear injection mold described in this embodiment includes a lower mold frame 1 and an upper mold frame 2 that is movably and vertically disposed on the top of the lower mold frame 1; the top of the lower mold frame 1 is provided with a concave mold core 11; the bottom of the upper mold frame 2 is provided with a convex mold core 21; The cavity 12 is provided in the middle of the concave mold core 11; sliding blocks 32 are provided on both sides of the concave mold core 11 in the horizontal direction; the sliding block 32 is provided with a rotatable inclined guide post 4; the inclined guide post 4 is inclined on the sliding block 32; the top of the inclined guide post 4 protrudes out of the top of the sliding block 32. The punch core 21 has a block 22 in the middle that mates with the cavity 12; the punch core 21 has guide oblique holes 5 on both sides; and a guide sleeve 6 that mates with the top of the oblique guide post 4 is rotatably disposed in the guide oblique holes 5. The low-wear injection mold also includes a lower drive mechanism for driving the inclined guide post 4 to rotate and an upper drive mechanism for driving the guide sleeve 6 to rotate.

[0019] Specifically, in the low-wear injection mold described in this embodiment, during mold closing, the upper mold frame 2 moves closer to the lower mold frame 1 along the mold closing direction, and the top of the inclined guide post 4 gradually inserts into the guide sleeve 6. As the mold closing stroke continues to advance, the inclined cooperation between the inclined guide post 4 and the guide sleeve 6 drives the sliding block 32 to slide horizontally toward the cavity 12, completing the lateral core pulling resetting action. During this process, the lower drive mechanism synchronously drives the inclined guide post 4 to rotate around its own axis, and the upper drive mechanism synchronously drives the guide sleeve 6 to rotate around its own axis, so that the contact friction position between the outer wall of the inclined guide post 4 and the inner wall of the guide sleeve 6 continuously changes with the rotation. During mold opening, the upper mold frame 2 moves away from the lower mold frame 1 along the mold opening direction, and the inclined guide post 4 and the guide sleeve 6 cooperate to drive the sliding block 32 to slide horizontally toward the side away from the cavity 12, completing the lateral core pulling action. At the same time, the lower drive mechanism drives the inclined guide post 4 to rotate again, and the upper drive mechanism drives the guide sleeve 6 to rotate again, so that the contact friction area between the two continues to switch positions.

[0020] In this embodiment, the lower drive mechanism drives the inclined guide post 4 to rotate and the upper drive mechanism drives the guide sleeve 6 to rotate, so that the position of the mating friction surfaces of the inclined guide post 4 and the guide sleeve 6 can change in each mold opening and closing cycle. This avoids the friction force being concentrated in a fixed area for a long time, effectively alleviates the problem of localized wear and tear, improves the core pulling motion accuracy, extends the service life of the core mating parts of the mold, and reduces the frequency of mold disassembly, inspection and maintenance.

[0021] The low-wear injection mold described in this embodiment includes a lower drive mechanism comprising a sliding shaft 7, a lower roller 71, and a trigger groove 34; the mold core 11 has sliding grooves 31 on both sides; the sliding block 32 is slidably disposed in the sliding groove 31; the trigger groove 34 is disposed at the bottom of the sliding groove 31 at the end away from the cavity 12; the sliding shaft 7 is telescopically movably disposed at the bottom of the inclined guide post 4; the lower roller 71 is rotatably disposed at the bottom of the sliding shaft 7; the top of the sliding shaft 7 is provided with a drive pin 72; the bottom of the inclined guide post 4 is provided with a drive groove 41; and the drive pin 72 is movably disposed in the drive groove 41.

[0022] Specifically, during the mold closing process, the sliding block 32, driven by the inclined guide post 4 and the guide sleeve 6, slides along the sliding groove 31 towards the cavity 12; when the sliding block 32 moves from the end of the sliding groove 31 away from the cavity 12 towards the cavity 12, the lower roller 71 gradually moves from the trigger groove 34 to the bottom of the sliding groove 31, causing the sliding shaft 7 to retract into the inclined guide post 4, and the drive pin 72 at the top of the sliding shaft 7 moves relative to the drive groove 41, causing the inclined guide post 4 to rotate around its own axis through the structural reaction of the drive groove 41; during the mold opening process, the sliding block 32... 2. Slide along the sliding groove 31 in a direction away from the cavity 12. When the lower roller 71 moves to the position of the trigger groove 34, the sliding shaft 7 extends outward from the inclined guide post 4, and the drive pin 72 moves in opposite directions in the drive groove 41, which again drives the inclined guide post 4 to rotate around its own axis. In this embodiment, the horizontal sliding motion of the sliding block 32 is converted into the extension and retraction motion of the sliding shaft 7, and then converted into the rotational motion of the inclined guide post 4 through the cooperation of the drive pin 72 and the drive groove 41. There is no need to set up an independent power source. The automatic rotation of the inclined guide post 4 can be achieved by relying on the mold opening and closing action.

[0023] In this embodiment, a low-wear injection mold is provided. The top wall of the drive groove 41 is provided with a first upper abutting spiral surface 42 and a second upper abutting spiral surface 43 alternately connected in sequence along the circumferential direction. The rotation direction of the first upper abutting spiral surface 42 is opposite to that of the second upper abutting spiral surface 43. An upper abutting groove 44 is formed between the top of the first upper abutting spiral surface 42 and the top of the second upper abutting spiral surface 43. The bottom wall of the drive groove 41 is provided with a lower abutting spiral surface 45 and a lower abutting vertical surface 46 alternately connected in sequence along the circumferential direction. A lower abutting groove 47 is formed between the bottom of the lower abutting spiral surface 45 and the bottom of the lower abutting vertical surface 46. The lower abutting groove 47 is located at the bottom of the first upper abutting spiral surface 42. The upper abutting groove 44 is located at the bottom of the lower abutting spiral surface 45. The rotation direction of the first upper abutting spiral surface 42 is opposite to that of the lower abutting spiral surface 45.

[0024] Specifically, during mold closing, the sliding shaft 7 retracts into the inclined guide post 4, and the drive pin 72 moves upward from the lower abutment groove 47 position, sliding along the spiral trajectory of the first upper abutment spiral surface 42, applying a circumferential force to the first upper abutment spiral surface 42, causing the inclined guide post 4 to rotate in the first direction; when the drive pin 72 moves to the top of the first upper abutment spiral surface 42, it engages in the corresponding upper abutment groove 44, completing one step rotation of the inclined guide post 4 in the mold closing process; during mold opening, the sliding shaft 7 extends outward from the inclined guide post 4, and the drive pin 72 moves downward from the upper abutment groove 44 position, sliding along the spiral trajectory of the lower abutment spiral surface 45, applying a circumferential force to the lower abutment spiral surface 45, causing the inclined guide post 4 to rotate in the first direction; when the mold opens, the sliding shaft 7 extends outward from the inclined guide post 4, and the drive pin 72 moves downward from the upper abutment groove 44 position, sliding along the spiral trajectory of the lower abutment spiral surface 45, applying a circumferential force to the lower abutment spiral surface 45, causing the inclined guide post 4 to rotate in the first direction; when the drive pin 72 moves to the top of the first upper abutment spiral surface 42, it engages the corresponding upper abutment groove 4 ... The guide post 4 continues to rotate in the first direction; when the drive pin 72 moves to the bottom of the lower abutting spiral surface 45, it is engaged in the corresponding lower abutting groove 47, completing the step rotation of the inclined guide post 4 in one mold opening process; in this embodiment, through the alternating cooperation of the first upper abutting spiral surface 42 and the second upper abutting spiral surface 43, the lower abutting spiral surface 45 and the lower abutting vertical surface 46, and the positioning function of the upper abutting groove 44 and the lower abutting groove 47, the unidirectional step rotation of the inclined guide post 4 is realized, ensuring that the inclined guide post 4 can rotate at a fixed angle in each mold opening and closing cycle, so that the friction area of ​​the outer wall of the inclined guide post 4 is evenly rotated, avoiding repeated force wear at the same position, and greatly improving the wear resistance and service life of the inclined guide post 4.

[0025] In this embodiment of a low-wear injection mold, a first return spring 73 is provided between the top of the sliding shaft 7 and the inclined guide post 4; a second return spring 33 is provided between the end of the sliding block 32 near the cavity 12 and the die core 11.

[0026] Specifically, during the mold closing process, the sliding block 32 slides towards the cavity 12, the second return spring 33 is compressed and stored by the sliding block 32, and at the same time, the lower roller 71 moves from the trigger groove 34 to the bottom of the sliding groove 31, the sliding shaft 7 retracts into the inclined guide post 4, the first return spring 73 is compressed and stored by the sliding shaft 7, and the drive pin 72 moves along the spiral surface in the drive groove 41 and drives the inclined guide post 4 to rotate; during the mold opening process, the second return spring 33 releases its elastic force, pushing the sliding block 32 to slide and reset away from the cavity 12, and when the lower roller 71 moves to the position of the trigger groove 34, the first return spring 73 releases its elastic force, pushing the sliding shaft 7 to extend outward from the inclined guide post 4 to reset, and the drive pin 72 moves along the spiral surface in the drive groove 41 and drives the inclined guide post 4 to rotate again.

[0027] In this embodiment, a low-wear injection mold is provided with a transition slope 35 between the sliding groove 31 and the trigger groove 34. During mold closing, the sliding block 32 slides from a position away from the cavity 12 toward the cavity 12 side, and the lower roller 71 starts from inside the trigger groove 34 and rolls smoothly upward along the transition slope 35, gradually transitioning to the bottom plane of the sliding groove 31, driving the sliding shaft 7 to smoothly retract into the inclined guide post 4; during mold opening, the sliding block 32 slides from the cavity 12 side toward a position away from the cavity 12, and the lower roller 71 starts from the bottom plane of the sliding groove 31 and rolls smoothly downward along the transition slope 35, gradually falling into the trigger groove 34, driving the sliding shaft 7 to smoothly extend outward from the inclined guide post 4.

[0028] The low-wear injection mold described in this embodiment includes an upper drive mechanism comprising a push rod 8 telescopically movably disposed on the punch core 21; one end of the push rod 8 protrudes into the guide oblique hole 5; the push rod 8 is movably disposed on one side of the bottom of the guide sleeve 6; and the outer wall of the bottom of the guide sleeve 6 is provided with a plurality of baffles 61 along the circumferential direction.

[0029] Specifically, during the mold closing and opening process, the push rod 8 extends and retracts along its own axis. When the push rod 8 extends into the guide inclined hole 5, the side wall of the push rod 8 abuts against the side wall of one of the baffles 61 at the bottom of the guide sleeve 6, applying a circumferential thrust to the baffle 61, causing the guide sleeve 6 to rotate around its own axis by an angle. When the push rod 8 retracts out of the guide inclined hole 5, the push rod 8 disengages from the current baffle 61, waiting for the next extension and retraction to push the next baffle 61, so that the guide sleeve 6 continues to rotate step by step in the same direction. In this embodiment, the extension and retraction of the push rod 8 pushes the baffle 61, converting linear motion into the rotational motion of the guide sleeve 6. This can be triggered synchronously with the mold opening and closing action, and the step rotation of the guide sleeve 6 can be achieved without an additional driving device, so that the friction area of ​​the inner wall of the guide sleeve 6 is constantly rotated, reducing the local wear of the guide sleeve 6.

[0030] In this embodiment, a low-wear injection mold is provided with a third return spring 81 between one end of the push rod 8 and the punch core 21; the other end of the push rod 8 is provided with an upper roller 82; the upper drive mechanism also includes a trigger rod 9 located at the top of the lower mold frame 1; the top of the trigger rod 9 is provided with a trigger block 91; the top and bottom of the trigger block 91 are provided with trigger inclined surfaces 92 that cooperate with the upper roller 82.

[0031] Specifically, during mold closing, the upper mold frame 2 moves closer to the lower mold frame 1, and the triggering inclined surface 92 on the upper side of the trigger block 91 at the top of the trigger rod 9 gradually contacts the upper roller 82. The squeezing action of the triggering inclined surface 92 pushes the push rod 8 to retract into the guide inclined hole 5, and the third return spring 81 is compressed and stored. The push rod 8 pushes the baffle 61 at the bottom of the guide sleeve 6 to make the guide sleeve 6 rotate. When the trigger block 91 completely passes the upper roller 82, the third return spring 81 releases its elastic force, pushing the push rod 8 to extend outward and reset. The push rod 8 disengages from the current baffle 61. During mold opening, the upper mold frame 2 moves away from the lower mold frame 1, and the triggering inclined surface 92 on the lower side of the trigger block 91 gradually contacts the upper roller 82, pushing the push rod 8 to retract into the guide inclined hole 5 again. The push rod 8 pushes the next baffle 61 to make the guide sleeve 6 continue to rotate in the original direction. After the trigger block 91 completely passes the upper roller 82, the third return spring 81 pushes the push rod 8 to reset again.

[0032] In this embodiment, a low-wear injection mold is provided, wherein the inner wall of the guide inclined hole 5 is provided with a locating pin 51 that can be extended and retracted; a fourth return spring 52 is provided between the locating pin 51 and the inner wall of the guide inclined hole 5; the outer wall of the top of the guide sleeve 6 is provided with a first locating inclined surface 62 and a second locating inclined surface 63 that are alternately connected in sequence along the circumferential direction; the inclination direction of the first locating inclined surface 62 is opposite to the inclination direction of the second locating inclined surface 63; a locating groove 64 that cooperates with the locating pin 51 is provided between the first locating inclined surface 62 and the second locating inclined surface 63.

[0033] Specifically, when the guide sleeve 6 is pushed and rotated by the push rod 8, the end of the positioning pin 51 slides along the first positioning inclined surface 62 and is squeezed by the first positioning inclined surface 62 and retracts towards the inner wall of the guide inclined hole 5, and the fourth return spring 52 is compressed; after the guide sleeve 6 rotates through one station, the end of the positioning pin 51 crosses the first positioning inclined surface 62 and reaches the position of the second positioning inclined surface 63. The fourth return spring 52 releases its elastic force and pushes the positioning pin 51 to extend outward along the second positioning inclined surface 63, and finally gets stuck in the corresponding positioning groove 64, completing one rotation positioning of the guide sleeve 6; the next time the push rod 8 pushes the baffle 61, the guide sleeve 6 continues to rotate, and the positioning pin 51 repeats the above process to realize the step-by-step positioning of the guide sleeve 6.

[0034] This embodiment describes a low-wear injection mold, in which a guide post 13 is provided at the top of the lower mold frame 1, and a guide hole 23 is provided at the bottom of the upper mold frame 2 to cooperate with the guide post 13. During mold closing, the guide post 13 is first inserted into the guide hole 23 to guide and correct the downward movement of the upper mold frame 2, ensuring that the upper mold frame 2 and the lower mold frame 1 align at a preset precise position, guaranteeing that the inclined guide post 4 can accurately insert into the guide sleeve 6 and the mold block 22 can accurately embed into the cavity 12. During mold opening, the guide post 13 retracts along the guide hole 23, continuously guiding the upward movement of the upper mold frame 2 to prevent horizontal displacement of the upper mold frame 2.

[0035] The overall workflow of the low-wear injection mold described in this embodiment is as follows: In the initial mold-opening state, the second return spring 33 pushes the sliding block 32 to the end of the sliding groove 31 on both sides of the die core 11 away from the cavity 12. Under the elastic force of the first return spring 73, the lower roller 71 falls into the trigger groove 34 at the bottom of the sliding groove 31. The drive pin 72 at the top of the sliding shaft 7 is located in the lower abutment groove 47 in the bottom drive groove 41 of the inclined guide post 4 and is below the first upper abutment spiral surface 42. At the same time, the positioning pin 51 on the inner wall of the guide inclined hole 5 is engaged in the top outer wall of the guide sleeve 6 under the action of the fourth return spring 52. In a positioning groove 64, the third return spring 81 pushes the push rod 8 to maintain its outward extension, and the side wall of the push rod 8 does not contact the baffle 61 on the bottom outer wall of the guide sleeve 6; when the mold begins to close, the upper mold frame 2 descends in the direction close to the lower mold frame 1, and the guide post 13 at the top of the lower mold frame 1 first inserts into the guide hole 23 at the bottom of the upper mold frame 2 to guide and align the opening and closing movements of the upper and lower molds. As the upper mold frame 2 continues to move downward, the upper triggering inclined surface 92 of the triggering block 91 at the top of the trigger rod 9 located at the top of the lower mold frame 1 and the upper roller at the end of the push rod 8... When the rollers 82 come into contact, the inclined plane 92 pushes the push rod 8 into the guide inclined hole 5 by squeezing the upper roller 82. The third return spring 81 is compressed synchronously. The push rod 8 extends into the side wall of the guide inclined hole 5 and abuts against one of the baffles 61 at the bottom of the guide sleeve 6, applying a circumferential thrust to it. This causes the guide sleeve 6 to start rotating around its own axis. During the rotation of the guide sleeve 6, the end of the positioning pin 51 on the inner wall of the guide inclined hole 5 slides along the first positioning inclined plane 62 on the top outer wall of the guide sleeve 6 and is squeezed inward by the inclined plane. The fourth return spring 52 is compressed accordingly. When the trigger block 91 completely passes the upper roller 82, the third reset spring 81 releases its elastic force to push the push rod 8 outward to reset. The push rod 8 disengages from the current baffle 61. At this time, the end of the positioning pin 51 passes the first positioning slope 62 and reaches the position of the second positioning slope 63. The fourth reset spring 52 then releases its elastic force to push the positioning pin 51 outward along the second positioning slope 63, and continues to push the guide sleeve 6 to rotate in the original rotation direction. Finally, the positioning pin 51 is inserted into the next positioning groove 64, completing one step rotation of the guide sleeve 6 in the mold closing stage.Subsequently, the upper mold frame 2 continues to descend, and the top of the inclined guide post 4, which is mounted on the sliding block 32, gradually inserts into the guide sleeve 6. As the mold closing stroke continues to advance, the inclined engagement structure between the inclined guide post 4 and the guide sleeve 6 generates a horizontal force, pushing the sliding block 32 to slide along the sliding groove 31 towards the cavity 12. The second return spring 33 is compressed and stores energy by the sliding block 32. At the same time, the lower roller 71 rolls smoothly upward from the trigger groove 34 along the transition slope 35, gradually transitioning to the bottom plane of the sliding groove 31, causing the sliding shaft 7 to retract into the inclined guide post 4. The first return spring 73 is compressed synchronously, and the sliding shaft 7... The top drive pin 72 moves upward from the lower abutment groove 47 position within the drive groove 41, sliding along the spiral trajectory of the first upper abutment spiral surface 42. The reaction force of the spiral surface on the drive pin 72 generates a circumferential component force, causing the inclined guide post 4 to rotate around its own axis in the first direction. When the sliding block 32 moves to the working position on the side of the cavity 12 and the lower roller 71 is fully inserted into the bottom plane of the sliding groove 31, the drive pin 72 moves into the upper abutment groove 44 at the top of the first upper abutment spiral surface 42, completing one step rotation of the inclined guide post 4 during the mold closing stage. At this time, the block 22 in the middle of the punch core 21 is embedded into the die core 11. In the central cavity 12, the sliding block 32 is inserted into the side of the cavity 12, the mold is closed and the injection molding operation begins; after the injection molding is completed, the mold opens, the upper mold frame 2 rises away from the lower mold frame 1, the inclined guide post 4 and the guide sleeve 6 generate a horizontal component force in opposite directions, driving the sliding block 32 to slide away from the cavity 12 along the sliding groove 31, the second return spring 33 releases elastic force to assist the sliding block 32 in returning to its original position, at the same time, the lower roller 71 rolls smoothly down from the bottom plane of the sliding groove 31 along the transition slope 35, gradually falling into the trigger groove 34, the sliding shaft 7 is in the first return spring Under the elastic force of 73, it extends outward from the inclined guide post 4. The drive pin 72 moves downward from the position of the upper abutment groove 44 and slides along the spiral trajectory of the lower abutment spiral surface 45. The reaction force of the spiral surface on the drive pin 72 generates a circumferential component force, which drives the inclined guide post 4 to continue to rotate in the first direction. When the lower roller 71 falls completely into the trigger groove 34 and the sliding block 32 returns to the initial position away from the cavity 12, the drive pin 72 moves to the lower abutment groove 47 at the bottom end of the lower abutment spiral surface 45. The lower abutment vertical surface 46 of the bottom wall of the drive groove 41 restricts the drive pin 72 to rotate in the opposite direction, completing one step rotation of the inclined guide post 4 in the mold opening stage.Afterwards, the upper mold frame 2 continues to rise, and the lower triggering slope 92 of the triggering block 91 of the triggering rod 9 contacts the upper roller 82. The triggering slope 92 presses the upper roller 82 again, pushing the push rod 8 to retract into the guide inclined hole 5. The push rod 8 abuts against the next baffle 61 at the bottom of the guide sleeve 6 and applies circumferential thrust, causing the guide sleeve 6 to continue rotating in the original rotation direction. The end of the positioning pin 51 retracts inward along the first positioning slope 62 again. When the triggering block 91 completely passes the upper roller 82, the third return spring 81 pushes the push rod 8 to extend outward and reset. The fourth return spring 52 pushes the positioning pin 51 to extend outward along the second positioning slope 63 and engage in the next positioning groove 64, completing one step rotation of the guide sleeve 6 in the mold opening stage. Thus, the mold completes one complete mold opening and closing cycle. The inclined guide post 4 and the guide sleeve 6 both rotate one fixed angle in a single direction, and the friction contact surfaces of the two work together to complete one position rotation simultaneously.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A low-wear injection mold, characterized in that: It includes a lower mold frame (1) and an upper mold frame (2) that is movably mounted on the top of the lower mold frame (1); the top of the lower mold frame (1) is provided with a concave mold core (11); the bottom of the upper mold frame (2) is provided with a convex mold core (21); The cavity (12) is provided in the middle of the cavity core (11); sliding blocks (32) are provided on both sides of the cavity core (11) in the horizontal direction; the sliding block (32) is provided with a rotatable inclined guide post (4); the inclined guide post (4) is inclined on the sliding block (32); the top of the inclined guide post (4) protrudes out of the top of the sliding block (32); The punch core (21) has a block (22) in the middle that mates with the cavity (12); the punch core (21) has guide oblique holes (5) on both sides; the guide oblique holes (5) are rotatably provided with guide sleeves (6) that mate with the top of the oblique guide post (4); The low-wear injection mold also includes a lower drive mechanism for driving the inclined guide post (4) to rotate and an upper drive mechanism for driving the guide sleeve (6) to rotate.

2. The low-wear injection mold according to claim 1, characterized in that: The lower drive mechanism includes a sliding shaft (7), a lower roller (71), and a trigger groove (34); the two sides of the die core (11) are provided with sliding grooves (31); the sliding block (32) is slidably disposed in the sliding groove (31); the trigger groove (34) is disposed at the bottom of the sliding groove (31) away from the cavity (12); the sliding shaft (7) is telescopically disposed at the bottom of the inclined guide post (4); the lower roller (71) is rotatably disposed at the bottom of the sliding shaft (7); the top of the sliding shaft (7) is provided with a drive pin (72); the bottom of the inclined guide post (4) is provided with a drive groove (41); the drive pin (72) is movably disposed in the drive groove (41).

3. The low-wear injection mold according to claim 2, characterized in that: The top wall of the drive groove (41) is provided with a first upper abutting spiral surface (42) and a second upper abutting spiral surface (43) that are alternately connected in sequence along the circumferential direction; the rotation direction of the first upper abutting spiral surface (42) is opposite to that of the second upper abutting spiral surface (43); an upper abutting groove (44) is formed between the top of the first upper abutting spiral surface (42) and the top of the second upper abutting spiral surface (43); The bottom wall of the drive groove (41) is provided with a lower abutting spiral surface (45) and a lower abutting vertical surface (46) that are alternately connected in the circumferential direction; a lower abutting groove (47) is formed between the bottom of the lower abutting spiral surface (45) and the bottom of the lower abutting vertical surface (46); The lower abutment groove (47) is located at the bottom of the first upper abutment spiral surface (42); the upper abutment groove (44) is located at the bottom of the lower abutment spiral surface (45); the rotation direction of the first upper abutment spiral surface (42) is opposite to the rotation direction of the lower abutment spiral surface (45).

4. A low-wear injection mold according to claim 3, characterized in that: A first return spring (73) is provided between the top of the sliding shaft (7) and the inclined guide post (4); a second return spring (33) is provided between the end of the sliding block (32) near the cavity (12) and the die core (11).

5. A low-wear injection mold according to claim 3, characterized in that: A transition slope (35) is provided between the sliding groove (31) and the trigger groove (34).

6. A low-wear injection mold according to claim 1, characterized in that: The upper drive mechanism includes a push rod (8) that is telescopically movably disposed on the punch core (21); one end of the push rod (8) protrudes into the guide oblique hole (5); the push rod (8) is movably disposed on one side of the bottom of the guide sleeve (6); the outer wall of the bottom of the guide sleeve (6) is provided with a plurality of baffles (61) along the circumferential direction.

7. A low-wear injection mold according to claim 6, characterized in that: A third return spring (81) is provided between one end of the push rod (8) and the punch core (21); an upper roller (82) is provided at the other end of the push rod (8); The upper drive mechanism also includes a trigger rod (9) located at the top of the lower mold frame (1); the top of the trigger rod (9) is provided with a trigger block (91); the top and bottom of the trigger block (91) are provided with trigger inclined surfaces (92) that cooperate with the upper roller (82).

8. A low-wear injection mold according to claim 6, characterized in that: The inner wall of the guide inclined hole (5) is provided with a positioning pin (51) that can be extended and retracted; a fourth return spring (52) is provided between the positioning pin (51) and the inner wall of the guide inclined hole (5); the outer wall of the top of the guide sleeve (6) is provided with a first positioning inclined surface (62) and a second positioning inclined surface (63) that are alternately connected in the circumferential direction; the inclination direction of the first positioning inclined surface (62) is opposite to the inclination direction of the second positioning inclined surface (63); a positioning groove (64) that cooperates with the positioning pin (51) is provided between the first positioning inclined surface (62) and the second positioning inclined surface (63).

9. A low-wear injection mold according to claim 1, characterized in that: The lower mold frame (1) is provided with a guide post (13) at the top; the upper mold frame (2) is provided with a guide hole (23) at the bottom that cooperates with the guide post (13).

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