An injection mold with automatic in-mold sprue cutting
The in-mold automatic gate cutting mechanism solves the problems of high labor intensity and uneven cutting caused by traditional manual gate trimming, and realizes automated gate cutting and improves product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHENZHEN CHENGYUAN TECH CO LTD
- Filing Date
- 2025-06-24
- Publication Date
- 2026-06-19
AI Technical Summary
Traditional manual trimming of gates is labor-intensive and leaves uneven surfaces, affecting product quality and production efficiency.
Design an injection mold with automatic in-mold gate cutting. The gate cutting mechanism is used, which drives the sliding seat and cutting rod to slide in the groove through the drive component to realize the automatic cutting of the gate. Combined with the drive cylinder and return spring, the accuracy and stability of the cutting are ensured.
It achieves automated gate removal, eliminating the need for manual secondary trimming, improving product flatness and production efficiency, and reducing production costs.
Smart Images
Figure CN224374768U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of injection mold technology, specifically to an injection mold with automatic in-mold gate cutting. Background Technology
[0002] In the field of plastic injection molding, the gate serves as the channel for molten plastic to enter the mold cavity and needs to be separated from the product after molding. Traditional processes rely on manual trimming of the gate. However, manual trimming of the gate is labor-intensive, unsightly, and can easily lead to surface collapse and cracking of the product, reducing the product's yield.
[0003] Therefore, it is necessary to use in-mold gate cutting to process the gate. Generally, the principle of ejecting and scraping the plastic part is used by using angled ejectors and ejector pins. When the plastic part is ejected, the gate is scraped or broken off. Although the gate can be automatically cut off, the disadvantage is that after the gate is cut off, the gate area is not smooth and requires secondary trimming, which not only increases the production cost but also reduces the production efficiency. Utility Model Content
[0004] The present invention aims to provide an injection mold with automatic in-mold gate cutting, which realizes automatic and precise gate cutting in the mold without the need for manual secondary trimming, ensuring the flatness and smoothness of the product surface, and improving the product qualification rate and production efficiency.
[0005] The technical solution adopted by this utility model is: an injection mold with automatic in-mold gate cutting, including a fixed mold assembly and a moving mold assembly, and a gate cutting mechanism disposed in the moving mold assembly. When the mold is closed, the fixed mold assembly and the moving mold assembly form a molding cavity for injection molding of the product. The fixed mold assembly includes a fixed mold plate and a fixed mold core. The moving mold assembly includes a moving mold plate and a moving mold core. The fixed mold assembly is provided with a main runner that connects to the nozzle of the injection molding machine, a branch runner that communicates with the main runner, and a gate disposed at the end of the branch runner and communicating with the molding cavity.
[0006] The gate cutting mechanism includes a sliding seat movably disposed within the moving mold core, a cutting rod with one end fixedly connected to the sliding seat and the other end extending into the gate, and a driving component for driving the sliding seat to slide and thus driving the cutting rod to move. The moving mold core has a groove that cooperates with the sliding seat. Before the mold opens, the driving component drives the sliding seat to slide relative to the groove, thereby driving the cutting rod to move and causing the cutting rod to cut the solidified injection molding material in the gate.
[0007] Optionally, the driving component includes a driving cylinder fixedly disposed within the moving template. The moving template has a cylinder groove for accommodating the driving cylinder. The cylinder groove is disposed opposite to the sliding groove, and the piston rod of the driving cylinder abuts against the sliding seat.
[0008] Optionally, the driving component further includes an oil supply seat fixedly disposed within the moving template. The oil supply seat has an oil storage chamber for storing oil and an oil inlet and an oil outlet communicating with the oil storage chamber. The oil inlet and the oil outlet are respectively connected to an oil inlet pipe and an oil outlet pipe. The end of the oil outlet pipe away from the oil outlet is connected to the driving cylinder, and the end of the oil inlet pipe away from the oil inlet extends to the edge of the moving template.
[0009] Optionally, the number of the gate cutting mechanism is at least two sets, the two sets of gate cutting mechanisms are symmetrically arranged in the moving template, and a connecting pipe is provided between the oil inlet pipes of the two sets of gate cutting mechanisms, the two ends of the connecting pipe being connected to the oil inlet pipes of the two sets of gate cutting mechanisms respectively.
[0010] Optionally, the gate cutting mechanism further includes a reset component, which is used to drive the sliding seat to reset after the drive assembly drives the sliding seat to slide and drives the cutting rod to cut off the solidified injection molding material in the gate.
[0011] Optionally, the reset component includes a reset spring disposed in the slide groove. The reset spring is disposed along the movement direction of the sliding seat, and the two ends of the reset spring abut against the side of the sliding seat away from the driving cylinder and the inner wall of the slide groove, respectively.
[0012] Optionally, the moving mold assembly further includes a first slider and a second slider slidably disposed on the moving mold plate and an insert fixedly disposed on the moving mold core. The first slider and the second slider are symmetrically disposed on both sides of the moving mold core, and when the mold is closed, the fixed mold core, the moving mold core, the first slider, the second slider and the insert cooperate to form the molding cavity.
[0013] Optionally, at least two inclined guide posts are fixedly provided on the fixed template, and the first slider and the second slider are respectively provided with inclined guide grooves that cooperate with the inclined guide posts.
[0014] After adopting the above technical solution, the beneficial effects of this utility model are as follows:
[0015] This application provides an injection mold with an automatic in-mold gate cutting mechanism, including a moving mold assembly, a fixed mold assembly, and a gate cutting mechanism. The driving assembly drives the sliding seat to slide and drives the cutting rod to cut off the solidified injection material in the gate, thereby separating the finished product from the solidified injection material in the gate. This eliminates the need for manual operation, saves manpower, provides better cutting effect, eliminates the need for secondary trimming, and improves production efficiency. Attached Figure Description
[0016] 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.
[0017] Figure 1 This is a schematic diagram of the overall structure of the mold in this embodiment;
[0018] Figure 2 This is a cross-sectional view of this embodiment;
[0019] Figure 3 This is a schematic diagram illustrating the cooperation relationship between the moving template, the moving mold core, and the gate cutting mechanism in this embodiment;
[0020] Figure 4 This is a schematic diagram in this embodiment used to illustrate the positional relationship between the runner, gate, insert and moving mold core;
[0021] Figure 5 yes Figure 4 A partial sectional view;
[0022] Figure 6 yes Figure 5 Enlarged view of section A.
[0023] Explanation of reference numerals in the attached drawings: 10. Fixed mold assembly; 101. Runner; 102. Gate; 11. Fixed mold panel; 12. Fixed mold plate; 121. Angled guide pillar; 13. Fixed mold core; 20. Moving mold assembly; 21. Moving mold base plate; 22. Moving mold plate; 23. Moving mold core; 231. Slide groove; 24. First slider; 241. Angled guide groove; 25. Second slider; 26. Insert; 30. Gate cutting mechanism; 31. Sliding seat; 32. Cutting rod; 33. Drive component; 331. Drive cylinder; 332. Oil supply seat; 3321. Oil inlet; 3322. Oil outlet; 333. Oil inlet pipe; 334. Oil outlet pipe; 34. Return spring; 35. Connecting pipe. Detailed Implementation
[0024] The following will refer to the appendix in the embodiments of this utility model. Figures 1-6 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.
[0025] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.
[0026] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.
[0027] This embodiment provides an injection mold with automatic in-mold gate cutting, referring to... Figures 1-6 The system includes a fixed mold assembly 10 and a moving mold assembly 20, as well as a gate cutting mechanism 30 disposed within the moving mold assembly 20. When the mold is closed, the fixed mold assembly 10 and the moving mold assembly 20 form a molding cavity for injection molding of the product. The fixed mold assembly 10 includes a fixed mold panel 11, a fixed mold plate 12, and a fixed mold core 13. The moving mold assembly 20 includes a moving mold base plate 21, a moving mold plate 22, and a moving mold core 23. The fixed mold assembly 10 is provided with a main runner that connects to the nozzle of the injection molding machine, a branch runner 101 that communicates with the main runner, and a gate 102 disposed at the end of the branch runner 101 and communicating with the molding cavity. When the mold is closed for injection molding, the injection molding machine delivers the injection material through the nozzle to the main runner, and then guides it through the branch runner 101 to the gate 102 and then into the molding cavity.
[0028] Since the main runner, branch runner 101 and gate 102 are all well-known technologies in the art and are not improvements of this application, they will not be described in detail in this embodiment.
[0029] The gate-cutting assembly 102 includes a sliding seat 31 movably disposed within the moving mold core 23, a cutting rod 32 with one end fixedly connected to the sliding seat 31 and the other end extending into the gate 102, and a driving component 33 for driving the sliding seat 31 to slide and thus actuate the cutting rod 32. The moving mold core 23 has a groove 231 that slides with the sliding seat 31. The end of the cutting rod 32 extending into the gate 102 has a cutting edge to facilitate cutting the solidified injection molding material within the gate 102. Before mold opening, the driving component 33 drives the sliding seat 31 to slide relative to the groove 231, causing the cutting rod 32 to move and cut the solidified injection molding material within the gate 102.
[0030] Understandably, when the cutting rod 32 cuts the injection molding material inside the gate 102, its cutting edge design allows it to easily cut into and cut the material, ensuring the accuracy and efficiency of the cutting process. Simultaneously, the sliding engagement between the sliding seat 31 and the groove 231 ensures the smoothness and precision of the cutting rod 32's movement, avoiding potential deviations or damage during the cutting process. Furthermore, the driving component 33 automates the entire gate-cutting process, eliminating the need for manual intervention and significantly improving production efficiency and product quality.
[0031] Furthermore, the driving component 33 includes a driving cylinder 331 fixedly disposed within the moving template 22. The moving template 22 has a cylinder groove for accommodating the driving cylinder 331. The cylinder groove is disposed opposite to the slide groove 231, and the piston rod of the driving cylinder 331 abuts against the sliding seat 31.
[0032] Understandably, the design of the drive cylinder 331 allows the sliding seat 31 to slide smoothly under the driving force. When the piston rod extends forward, it pushes the sliding seat 31 to slide along the slide groove 231, thereby driving the cutting rod 32 to move to the gate 102 position to complete the cutting action. This ensures the stability and accuracy of the movement of the cutting rod 32. At the same time, the relative arrangement of the cylinder groove and the slide groove 231 optimizes the internal spatial layout of the mold, making the mold structure more compact and reasonable.
[0033] Furthermore, the driving component 33 also includes an oil supply seat 332 fixedly disposed within the moving template 22. The oil supply seat 332 has an oil storage cavity for storing oil and an oil inlet 3321 and an oil outlet 3322 communicating with the oil storage cavity. The oil inlet 3321 and the oil outlet 3322 are respectively connected to an oil inlet pipe 333 and an oil outlet pipe 334. The end of the oil outlet pipe 334 away from the oil outlet 3322 is connected to the driving cylinder 331, and the end of the oil inlet pipe 333 away from the oil inlet 3321 extends to the edge of the moving template 22.
[0034] Understandably, the oil supply seat 332 ensures a continuous and stable oil supply to the drive cylinder 331. The oil inlet pipe 333 introduces external oil into the oil storage chamber of the oil supply seat 332, while the oil outlet pipe 334 delivers the oil from the storage chamber to the drive cylinder 331, thereby driving the extension and retraction of the piston rod. This not only improves the efficiency of oil recycling but also effectively prevents mold malfunctions caused by insufficient or interrupted oil supply. Furthermore, extending the oil inlet pipe 333 to the edge of the moving platen 22 facilitates connection to an external oil supply system, further enhancing the practicality and convenience of the mold.
[0035] Furthermore, the number of gate cutting mechanisms 30 is at least two sets, and the two sets of gate cutting mechanisms 30 are symmetrically arranged in the moving template 22. A connecting pipe 35 is provided between the oil inlet pipes 333 of the two sets of gate cutting mechanisms 30, and the two ends of the connecting pipe 35 are respectively connected to the oil inlet pipes 333 of the gate cutting mechanism 30.
[0036] In this embodiment, due to the size of the injection-molded product, two gates 102 are provided to ensure injection efficiency and injection quality. Correspondingly, two sets of gate-cutting mechanisms 30 are also provided to achieve the purpose of simultaneously cutting off the gates 102 on both sides. The connection pipe 35 allows the oil inlet pipes 333 of the two sets of gate-cutting mechanisms 30 to be interconnected, thereby ensuring that the two sets of mechanisms can receive oil supply at the same time, improving the uniformity and stability of oil distribution.
[0037] Furthermore, the gate cutting mechanism 30 also includes a reset member, which is used to reset the sliding seat 31 after the drive assembly drives the sliding seat 31 to slide and drives the cutting rod 32 to cut off the solidified injection molding material in the gate 102.
[0038] The design of the reset component ensures that the cutting rod 32 can quickly and accurately return to the initial position after completing a cutting action, preparing for the next cutting action.
[0039] Specifically, the reset component includes a reset spring 34 disposed in the slide groove 231. The reset spring 34 is disposed along the movement direction of the sliding seat 31, and the two ends of the reset spring 34 abut against the side of the sliding seat 31 away from the oil cylinder and the inner wall of the slide groove 231, respectively.
[0040] Understandably, the reset spring 34 not only enables the automatic reset of the sliding seat 31 but also improves the stability and durability of the gate cutting mechanism 30. After the cutting rod 32 completes the cutting action, the reset spring 34 uses its own elasticity to push the sliding seat 31 to slide in the opposite direction along the slide groove 231 until the sliding seat 31 returns to its initial position. During this process, the elasticity of the reset spring 34 ensures the accuracy and efficiency of the reset of the sliding seat 31, avoiding mold failure or damage caused by improper reset.
[0041] Furthermore, the moving mold assembly 20 also includes a first slider 24 and a second slider 25 slidably disposed on the moving mold plate 22, and an insert 26 fixedly disposed on the moving mold core 23. The first slider 24 and the second slider 25 are symmetrically disposed on both sides of the moving mold core 23, and when the mold is closed, the fixed mold core 13, the moving mold core 23, the first slider 24, the second slider 25 and the insert 26 cooperate to form a molding cavity.
[0042] Understandably, the arrangement of the first slider 24 and the second slider 25 allows for a tighter fit between the molds during mold closing, ensuring that the injection material is evenly filled into the molding cavity and preventing defects. Simultaneously, the fixed arrangement of the insert 26 not only enhances the structural strength of the moving mold core 23 but also makes the shape of the molding cavity more stable, improving the precision and quality of the injection molded product.
[0043] Furthermore, at least two inclined guide posts 121 are fixedly provided on the fixed template 12, and the first slider 24 and the second slider 25 are respectively provided with inclined guide grooves 241 that cooperate with the inclined guide posts 121.
[0044] Understandably, the cooperative design of the inclined guide post 121 and the inclined guide groove 241 enables the inclined guide post 121 to guide the first slider 24 and the second slider 25 to slide during the mold opening and closing process, thereby realizing the mold opening and closing, which facilitates the ejection and demolding of the product.
[0045] Working Principle: During the injection molding process, the injection material is injected into the molding cavity through the nozzle of the injection molding machine. After cooling and solidification, the desired injection molded product is obtained. At this time, the gate cutting mechanism 30 starts to work. The drive component drives the sliding seat 31 to slide, which in turn drives the cutting rod 32 to cut the solidified injection material in the gate 102, realizing the function of automatic gate cutting 102 in the mold. The return spring 34 drives the sliding seat 31 to slide in the opposite direction, so that the cutting rod 32 can quickly and accurately return to the initial position after completing one cutting action, so as to prepare for the next cutting operation.
[0046] The above is only used to illustrate the technical solution of this utility model and not to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.
Claims
1. An injection mold for in-mold automatic sprue cutting, characterized by, The system includes a fixed mold assembly (10) and a moving mold assembly (20), as well as a gate cutting mechanism (30) disposed in the moving mold assembly (20). When the mold is closed, the fixed mold assembly (10) and the moving mold assembly (20) form a molding cavity for injection molding of the product. The fixed mold assembly (10) includes a fixed mold plate (12) and a fixed mold core (13). The moving mold assembly (20) includes a moving mold plate (22) and a moving mold core (23). The fixed mold assembly (10) is provided with a main runner that is connected to the nozzle of the injection molding machine, a branch runner (101) that is connected to the main runner, and a gate (102) disposed at the end of the branch runner (101) and connected to the molding cavity. The gate cutting mechanism (30) includes a sliding seat (31) movably disposed in the moving mold core (23), a cutting rod (32) with one end fixedly connected to the sliding seat (31) and the other end extending into the gate (102), and a driving member (33) for driving the sliding seat (31) to slide and drive the cutting rod (32) to move. The moving mold core (23) has a groove (231) that cooperates with the sliding seat (31). Before the mold is opened, the driving member (33) drives the sliding seat (31) to slide relative to the groove (231), thereby driving the cutting rod (32) to move and causing the cutting rod (32) to cut the solidified injection molding material in the gate (102).
2. The injection mold with automatic in-mold gate cutting according to claim 1, characterized in that, The driving component (33) includes a driving cylinder (331) fixedly disposed in the moving template (22). The moving template (22) has a cylinder groove for accommodating the driving cylinder (331). The cylinder groove is disposed opposite to the slide groove (231), and the piston rod of the driving cylinder (331) abuts against the sliding seat (31).
3. The injection mold with automatic in-mold gate cutting according to claim 2, characterized in that, The driving component (33) also includes an oil supply seat (332) fixedly disposed in the moving template (22). The oil supply seat (332) has an oil storage cavity for storing oil and an oil inlet (3321) and an oil outlet (3322) communicating with the oil storage cavity. The oil inlet (3321) and the oil outlet (3322) are respectively connected to an oil inlet pipe (333) and an oil outlet pipe (334). The end of the oil outlet pipe (334) away from the oil outlet (3322) is connected to the driving cylinder (331). The end of the oil inlet pipe (333) away from the oil inlet (3321) extends to the edge of the moving template (22).
4. The injection mold with automatic in-mold gate cutting according to claim 3, characterized in that, The number of the gate cutting mechanism (30) is at least two sets, and the two sets of gate cutting mechanisms (30) are symmetrically arranged in the moving template (22). A connecting pipe (35) is provided between the oil inlet pipes (333) of the two sets of gate cutting mechanisms (30), and the two ends of the connecting pipe (35) are respectively connected to the oil inlet pipes (333) of the two sets of gate cutting mechanisms (30).
5. The injection mold with automatic in-mold gate cutting according to claim 2, characterized in that, The gate cutting mechanism (30) also includes a reset member, which is used to reset the sliding seat (31) after the driving member (33) drives the sliding seat (31) to slide and drives the cutting rod (32) to cut off the solidified injection molding material in the gate (102).
6. The injection mold with automatic in-mold gate cutting according to claim 5, characterized in that, The reset component includes a reset spring (34) disposed in the slide groove (231). The reset spring (34) is disposed along the movement direction of the sliding seat (31), and the two ends of the reset spring (34) respectively abut against the side of the sliding seat (31) away from the driving cylinder (331) and the inner wall of the slide groove (231).
7. The injection mold with automatic in-mold gate cutting according to claim 1, characterized in that, The moving mold assembly (20) further includes a first slider (24) and a second slider (25) slidably disposed on the moving mold plate (22) and an insert (26) fixedly disposed on the moving mold core (23). The first slider (24) and the second slider (25) are symmetrically disposed on both sides of the moving mold core (23), and when the mold is closed, the fixed mold core (13), the moving mold core (23), the first slider (24), the second slider (25) and the insert (26) cooperate to form the molding cavity.
8. The injection mold with automatic in-mold gate cutting according to claim 7, characterized in that, At least two inclined guide posts (121) are fixedly provided on the fixed template (12), and the first slider (24) and the second slider (25) are respectively provided with inclined guide grooves (241) that cooperate with the inclined guide posts (121).