Mold structure capable of solving gas marks at sprue

Abstract

The utility model discloses a mould structure capable of solving gas marks at a sprue, which comprises an upper mould base and a lower mould base, a guide mechanism is connected between the upper mould base and the lower mould base, the upper side of the lower mould base is fixedly connected with a fixed mould, the lower side of the upper mould base is fixedly connected with a movable mould, both the fixed mould and the movable mould are provided with cavities, and the cavities are communicated with the guide mechanism. A pouring hole is formed in the upper die base, and the upper side of the upper die base is fixedly connected with a pouring guide pipe communicated with the pouring hole. According to the utility model, smooth discharge of gas can be ensured, gas marks caused by retention and accumulation of the gas are avoided, the appearance quality and the molding precision of an injection product are effectively improved, the flowability of molten plastic can be improved, and the pouring smoothness of the mold is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, specifically to a mold structure that can solve the problem of air marks at the gate. Background Technology

[0002] Injection molds are tools used to produce plastic products, giving them a complete structure and precise dimensions. Injection molding is a processing method used for the mass production of certain complex-shaped parts. Specifically, it involves injecting molten plastic into a mold cavity under high pressure using an injection molding machine, where it is then cooled and solidified to obtain the molded product.

[0003] In the traditional gate design of existing injection molds, the unreasonable design of the vent hole makes it impossible to ensure that the gas is discharged evenly and quickly in the gate area. As a result, the gas is stuck at the gate of the mold, which causes air marks to form in the gate area, affecting the appearance and quality of the product. Utility Model Content

[0004] The purpose of this invention is to provide a mold structure that can solve the problem of air marks at the gate, thereby addressing the issues raised in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] This utility model provides a mold structure that can solve the problem of air marks at the gate, including an upper mold base and a lower mold base. A guide mechanism is connected between the upper mold base and the lower mold base. A fixed mold is fixedly connected to the upper side of the lower mold base, and a moving mold is fixedly connected to the lower side of the upper mold base. Both the fixed mold and the moving mold have cavities. A gating hole is provided on the upper mold base. A gating guide tube communicating with the gating hole is fixedly connected to the upper side of the upper mold base. The diameter of the gating guide tube gradually increases from top to bottom. Multiple horn-shaped feed holes communicating with the cavities are provided on the moving mold. A cross-shaped runner communicating with the multiple horn-shaped feed holes is provided on the upper side of the moving mold. The center of the cross-shaped runner is located directly below the gating hole. Multiple vent holes communicating with the cavities are provided on both the upper mold base and the moving mold. The diameter of the vent holes gradually increases from bottom to top. Multiple vent grooves communicating with the vent holes and the cross-shaped runner are provided on the upper side of the moving mold.

[0007] Furthermore, an electric heater is fixedly connected to the upper side of the upper mold base, the electric heater is tightly fitted to the outer wall of the pouring conduit, and a temperature controller for controlling the electric heater is fixedly connected to the upper mold base.

[0008] Furthermore, the guiding mechanism includes multiple guide posts fixedly connected to the four corners of the upper surface of the lower mold base, and multiple guide sleeves corresponding to the guide posts are fixedly connected to the upper mold base, with the guide posts movably inserted into the guide sleeves.

[0009] Furthermore, the inner wall of the casting conduit, the wall of the casting hole, the wall of the funnel-shaped feed hole, and the cross-shaped flow channel are all coated with chromium-plated paint.

[0010] Furthermore, the inner wall of the casting conduit, the wall of the casting hole, the wall of the trumpet-shaped feed hole, the cavity wall, and the cross-shaped flow channel are all surface polished.

[0011] Furthermore, an insulating sleeve is fixedly connected to the upper side of the upper mold base, and the electric heater is located inside the insulating sleeve.

[0012] Furthermore, both the upper and lower ends of the guide sleeve are rounded.

[0013] Furthermore, an overflow prevention sleeve is fixedly fitted on the outside of the pouring conduit, a discharge pipe is fixedly connected to the overflow prevention sleeve, a guide plate is fixedly connected to the inner wall at the bottom of the overflow prevention sleeve, and a collection plate is fixedly connected to the vertical inner wall of the overflow prevention sleeve.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This utility model, through the setting of the pouring hole, pouring guide, trumpet-shaped feed hole, cross-shaped flow channel, vent hole and vent groove, can accelerate the discharge of gas in the mold during pouring, which can avoid the formation of gas marks due to gas retention and accumulation, and effectively improve the appearance quality and molding accuracy of injection molded products.

[0016] 2. This utility model, through the installation of an electric heater and a temperature controller, can ensure that the temperature of the molten plastic entering the gate area is uniform, avoid the formation of gas streaks due to excessive temperature difference, and improve the fluidity of the molten plastic, thus effectively improving the smoothness of mold pouring. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is the front view of the present invention;

[0019] Figure 3 for Figure 2 Sectional view along the middle AA direction;

[0020] Figure 4 for Figure 1 Exploded view of the upper mold base and the upper mold core;

[0021] Figure 5 for Figure 1 Schematic diagram of the upper and middle mold core;

[0022] Figure 6 for Figure 1Schematic diagram of the connection structure between the overflow prevention cylinder and the pouring pipe.

[0023] In the diagram: 1. Upper mold base; 2. Lower mold base; 3. Fixed mold; 4. Moving mold; 5. Cavity; 6. Gating hole; 7. Gating guide; 8. Trumpet-shaped feed hole; 9. Cross-shaped runner; 10. Vent hole; 11. Vent groove; 12. Electric heater; 13. Temperature controller; 14. Guide pillar; 15. Guide sleeve; 16. Insulation sleeve; 17. Overflow sleeve; 18. Discharge pipe; 19. Baffle plate; 20. Collector plate. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-6 This utility model provides a mold structure that can solve the problem of air marks at the gate, including an upper mold base 1 and a lower mold base 2. A guide mechanism is connected between the upper mold base 1 and the lower mold base 2. A fixed mold 3 is fixedly connected to the upper side of the lower mold base 2, and a movable mold 4 is fixedly connected to the lower side of the upper mold base 1. Both the fixed mold 3 and the movable mold 4 have cavities 5. A gating hole 6 is provided on the upper mold base 1. A gating conduit 7 communicating with the gating hole 6 is fixedly connected to the upper side of the upper mold base 1. The diameter of the gating conduit 7 from top to bottom... The diameter of the vent holes gradually increases from bottom to top. The moving mold 4 has multiple horn-shaped feed holes 8 that communicate with the cavity 5. The upper side of the moving mold 4 has a cross-shaped runner 9 that communicates with the multiple horn-shaped feed holes 8. The center of the cross-shaped runner 9 is located directly below the gating hole 6. Both the upper mold base 1 and the moving mold 4 have multiple vent holes 10 that communicate with the cavity 5. The diameter of the vent holes 10 gradually increases from bottom to top. The upper side of the moving mold 4 has multiple vent grooves 11 that communicate with the vent holes 10 and the cross-shaped runner 9.

[0026] In the above embodiments, during casting, since the gating conduit 7 and the trumpet-shaped feed hole 8 adopt a gradient design, and since the diameter of the gating conduit 7 and the trumpet-shaped feed hole 8 gradually increases from top to bottom, the molten plastic will not suddenly accelerate its flow rate when entering the mold, thereby reducing the probability of gas retention. The cross-shaped runner 9 automatically diverts the flow, and some of the gas in the cross-shaped runner 9 is discharged into the vent hole 10 through the vent groove 11. The gas in the cavity 5 is accelerated to be discharged through multiple gradually designed vent holes 10 on the moving mold 4, thereby ensuring smooth gas discharge and avoiding gas streaks caused by gas retention and accumulation, effectively improving the appearance quality and molding accuracy of the injection molded product.

[0027] An electric heater 12 is fixedly connected to the upper side of the upper mold base 1. The electric heater 12 is tightly fitted to the outer wall of the pouring conduit 7. A temperature controller 13 for controlling the electric heater 12 is fixedly connected to the upper mold base 1.

[0028] In this embodiment, the electric heater 12 can locally heat the pouring conduit 7, thereby ensuring that the temperature of the molten plastic entering the gate area is uniform, avoiding gas stagnation and air streaks caused by excessive temperature difference, and also improving the fluidity of the molten plastic, effectively improving the smoothness of mold pouring.

[0029] The guiding mechanism includes multiple guide posts 14 fixedly connected to the four corners of the upper surface of the lower mold base 2. Multiple guide sleeves 15 corresponding to the guide posts 14 are fixedly connected to the upper mold base 1. The guide posts 14 are movably inserted into the guide sleeves 15. Through the cooperation between the guide posts 14 and the guide sleeves 15, the relative sliding stability between the moving mold 4 and the fixed mold 3 can be improved, and the mold closing accuracy can be improved.

[0030] The inner wall of the gating conduit 7, the wall of the gating hole 6, the wall of the trumpet-shaped feed hole 8, and the cross-shaped runner 9 are all coated with chromium-plated paint. The inner wall of the gating conduit 7, the wall of the gating hole 6, the wall of the trumpet-shaped feed hole 8, the cavity wall of the cavity 5, and the cross-shaped runner 9 are all surface polished, which can improve the surface smoothness and wear resistance of the mold, reduce friction and gas retention, and reduce the generation of air marks.

[0031] An insulating sleeve 16 is fixedly connected to the upper side of the upper mold base 1. The electric heater 12 is located inside the insulating sleeve 16, which can reduce the rate of heat loss and improve the heating efficiency of the electric heater 12.

[0032] The upper and lower ends of the guide sleeve 15 are rounded, which can improve the smoothness of the relative sliding between the guide sleeve 15 and the guide post 14 and reduce the wear of the guide sleeve 15 and the guide post 14.

[0033] An overflow prevention cylinder 17 is fixedly sleeved on the outside of the pouring conduit 7. A discharge pipe 18 is fixedly connected to the overflow prevention cylinder 17. A guide plate 19 is fixedly connected to the inner wall at the bottom of the overflow prevention cylinder 17. A flow collecting plate 20 is fixedly connected to the vertical inner wall of the overflow prevention cylinder 17. This system can receive and discharge the raw materials overflowing from the pouring conduit 7, thereby improving the overflow prevention effect of the mold.

[0034] Working principle: During casting, the electric heater 12 is heated by the temperature controller 13 to inject molten plastic into the casting guide 7. Since the casting guide 7 and the trumpet-shaped feed hole 8 adopt a gradual design, and the diameter of the casting guide 7 and the trumpet-shaped feed hole 8 gradually increases from top to bottom, the molten plastic will not suddenly accelerate its flow rate when entering the mold, thereby reducing the chance of gas retention. The molten plastic flows into the cross-shaped runner 9 through the trumpet-shaped feed hole 8 for automatic diversion, which can ensure smooth flow of the molten plastic. Some of the gas in the cross-shaped runner 9 is discharged into the vent hole 10 through the vent groove 11. The gas in the cavity 5 is accelerated to be discharged through multiple gradually designed vent holes 10 on the moving mold 4, which can ensure smooth gas discharge and avoid gas streaks caused by gas retention and accumulation. This effectively improves the appearance quality and molding accuracy of the injection molded product, and also ensures that the temperature of the molten plastic entering the gate area is uniform, avoiding gas streaks caused by excessive temperature difference. It can also improve the fluidity of the molten plastic and effectively improve the smoothness of mold casting.

[0035] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mold structure capable of solving the problem of air marks at the gate, comprising an upper mold base (1) and a lower mold base (2), characterized in that: A guide mechanism is connected between the upper mold base (1) and the lower mold base (2). A fixed mold (3) is fixedly connected to the upper side of the lower mold base (2), and a moving mold (4) is fixedly connected to the lower side of the upper mold base (1). Both the fixed mold (3) and the moving mold (4) have cavities (5). A pouring hole (6) is provided on the upper mold base (1). A pouring guide (7) communicating with the pouring hole (6) is fixedly connected to the upper side of the upper mold base (1). The diameter of the pouring guide (7) gradually increases from top to bottom. Multiple openings are provided on the moving mold (4) that communicate with the cavities. (5) A horn-shaped feed hole (8) is connected. The upper side of the moving mold (4) is provided with a cross-shaped flow channel (9) that is connected to the multiple horn-shaped feed holes (8). The center of the cross-shaped flow channel (9) is located directly below the pouring hole (6). The upper mold base (1) and the moving mold (4) are provided with multiple vent holes (10) that are connected to the cavity (5). The diameter of the vent holes (10) gradually increases from bottom to top. The upper side of the moving mold (4) is provided with multiple vent grooves (11) that are connected to the vent holes (10) and the cross-shaped flow channel (9).

2. The mold structure according to claim 1, characterized in that: An electric heater (12) is fixedly connected to the upper side of the upper mold base (1). The electric heater (12) is tightly fitted to the outer wall of the pouring conduit (7). A temperature controller (13) for controlling the electric heater (12) is fixedly connected to the upper mold base (1).

3. The mold structure according to claim 2, characterized in that: The guiding mechanism includes multiple guide posts (14) fixedly connected to the four corners of the upper surface of the lower mold base (2). Multiple guide sleeves (15) corresponding to the guide posts (14) are fixedly connected to the upper mold base (1). The guide posts (14) are movably inserted into the guide sleeves (15).

4. The mold structure according to claim 3, characterized in that: The inner wall of the casting conduit (7), the wall of the casting hole (6), the wall of the trumpet-shaped feed hole (8), and the cross-shaped flow channel (9) are all coated with chromium-plated paint.

5. The mold structure according to claim 4, characterized in that: The inner wall of the casting conduit (7), the wall of the casting hole (6), the wall of the trumpet-shaped feed hole (8), the cavity wall of the cavity (5), and the cross-shaped flow channel (9) are all surface polished.

6. The mold structure according to claim 5, characterized in that: An insulating sleeve (16) is fixedly connected to the upper side of the upper mold base (1), and the electric heater (12) is located inside the insulating sleeve (16).

7. The mold structure according to claim 6, characterized in that: Both the upper and lower ends of the guide sleeve (15) are rounded.

8. The mold structure according to claim 7, characterized in that: An overflow prevention cylinder (17) is fixedly sleeved on the outside of the pouring conduit (7). A discharge pipe (18) is fixedly connected to the overflow prevention cylinder (17). A guide plate (19) is fixedly connected to the inner wall at the bottom of the overflow prevention cylinder (17). A collection plate (20) is fixedly connected to the vertical inner wall of the overflow prevention cylinder (17).

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