Double-layer injection mold with exhaust performance

Abstract

According to the double-layer injection mold with the exhaust performance, the design of integrating and optimizing the mold core of the injection molding male mold and the exhaust structure is adopted, so that the double-layer injection mold has the functions of double-layer structure forming and multi-stage exhaust, and the injection molding male mold, the injection molding female mold and the injection molding assembly are matched with one another, so that an injection molding product with a double-layer structure is formed; and meanwhile, gas is exhausted in stages and regions, it is ensured that gas in the injection molding space can be fully exhausted, product defects caused by gas accumulation are avoided, and the problem that an existing traditional single exhaust structure cannot meet the staged and regional exhaust requirements of complex structural parts is solved.

Description

TECHNICAL FIELD

[0002] The utility model relates to injection mold technical field especially, it is a kind of double-layer injection mold with exhaust performance.

BACKGROUND

[0004] In injection molding process, bubble, scorching and other defects are the key problem affecting product quality, its root lies in the gas in mold cavity cannot be discharged in time during injection molding.

[0005] At present, traditional injection mold usually adopts single exhaust structure, for example, through parting surface gap, ejector pin gap or opening simple exhaust groove to realize gas discharge. However, in complex structure parts such as double-layer composite parts, multi-curved parts, cavity structure is caused by stratification or special-shaped design to cause gas flow path to lengthen, and traditional exhaust structure is difficult to adapt to the needs of gas discharging in stages and in areas. Gas is easy to accumulate in cavity dead angle or material convergence area, causing local "trapped gas", causing internal cavity or surface scorching of product.

SUMMARY

[0007] The utility model aims at providing a kind of double-layer injection mold with exhaust performance, solve the problem that current traditional single exhaust structure cannot satisfy the exhaust needs of complex structure parts in stages and in areas.

[0008] The utility model is realized by the following technical solutions:

[0009] A kind of double-layer injection mold with exhaust performance, including the injection male die and injection female die for forming and the injection assembly being arranged in the injection female die, the injection male die, the injection female die and the injection assembly form an injection space, the injection male die is provided with exhaust structure for the exhaust of the injection space.

[0010] The double-layer injection mold with exhaust performance as described above, the injection male die includes the first core that abuts with the injection assembly and the second core and third core for forming and the fourth core that abuts with the injection female die.

[0011] The double-layer injection mold with exhaust performance as described above, the exhaust structure includes the first-stage exhaust structure arranged in the second core and the second-stage exhaust structure arranged in the third core and the third-stage exhaust structure arranged in the fourth core.

[0012] The double-layer injection mold with exhaust performance as described above, first-stage exhaust structure and second-stage exhaust structure are both provided with first flow channel for guiding gas and first exhaust passage for discharging gas.

[0013] The double-layer injection mold with the exhaust performance has a third exhaust structure provided with a plurality of exhaust holes for buffering gas, a second flow channel for guiding the gas of the exhaust holes, and a second exhaust channel for exhausting the gas.

[0014] The double-layer injection mold with the exhaust performance has a first core provided with a first molding block for molding and a first molding groove arranged on the first molding block.

[0015] The double-layer injection mold with the exhaust performance has a second core provided with a plurality of molding ribs for molding.

[0016] The double-layer injection mold with the exhaust performance has a third core provided with a second molding block for molding and a plurality of second molding grooves arranged on the second molding block.

[0017] The double-layer injection mold with the exhaust performance has an injection assembly comprising an injection member for injecting material and a reset member for molding and resetting.

[0018] The double-layer injection mold with the exhaust performance has an injection channel for injecting material arranged in the injection member and the reset member, and a reset space for accommodating a ejector pin arranged in the reset member.

[0019] Compared with the prior art, the double-layer injection mold with the exhaust performance has the following advantages:

[0020] The double-layer injection mold with the exhaust performance comprises an injection mold, an injection mold cavity, an injection assembly, a first core, a second core, a third core, an injection member, and a reset member.

[0021] The double-layer injection mold with the exhaust performance has an injection channel for injecting material arranged in the injection member and the reset member, and a reset space for accommodating a ejector pin arranged in the reset member.

DRAWINGS

[0023] Figure 1This is a partial structural diagram of the present invention;

[0024] Figure 2 for Figure 1 Cross-sectional view at point AA;

[0025] Figure 3 for Figure 2 Enlarged view of the structure at point B;

[0026] Figure 4 A three-dimensional view of the first core;

[0027] Figure 5 This is a three-dimensional diagram of the second core.

[0028] Figure 6 A three-dimensional diagram of the third core;

[0029] Figure 7 This is a three-dimensional diagram of the fourth core.

Detailed Implementation Methods

[0031] The following is in conjunction with the appendix Figures 1-7 The present invention will be further described in detail with reference to the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0032] Figures 1-7 A double-layer injection mold with venting performance includes an injection punch 1 and an injection die 2 for molding, and an injection assembly 3 passing through the injection die 2. The injection punch 1, the injection die 2 and the injection assembly 3 form an injection space 4. The injection punch 1 is provided with a venting structure 5 for venting the injection space 4.

[0033] In this implementation, firstly, an injection space is formed by the nested cooperation of an injection punch, an injection die, and an injection assembly. The injection punch and injection assembly form the inner structure of the product, while the injection punch and injection die form the outer structure. The injection assembly passes through the injection die to ensure rapid material injection into the cavity, reducing temperature stress caused by flow delay. Secondly, by integrating a venting structure into the injection punch and placing it at the end of the material filling path, multi-area venting of the inner and outer structures of the product is achieved. This ensures that gas within the injection space can be fully discharged, preventing gas accumulation that could lead to product defects.

[0034] Furthermore, the injection punch 1 includes a first core 11 that abuts against the injection assembly 3, a second core 12 and a third core 13 for molding, and a fourth core 14 that abuts against the injection die 2.

[0035] Specifically, the second core 12 is sleeved on the outer surface of the first core 11, the third core 13 is sleeved on the outer surface of the second core 12, and the fourth core 14 is sleeved on the outer surface of the third core 13.

[0036] In the embodiment, first, the first core abuts against the injection molding assembly to transfer the pressure of the injection molding assembly, and the fourth core abuts against the injection cavity of the injection mold to counterbalance the force of the injection cavity, thereby forming a bidirectional positioning reference, ensuring the core alignment accuracy, and reducing the risk of mold deformation. Second, the outer layer structure is formed by the injection cavity wall of the injection punch and the injection cavity of the injection mold, and the inner layer structure is formed by the combination of the first core, the second core and the third core, thereby realizing the molding of a complex structure.

[0037] Further, the exhaust structure 5 includes a first-stage exhaust structure 51 arranged on the second core 12, a second-stage exhaust structure 52 arranged on the third core 13, and a third-stage exhaust structure 53 arranged on the fourth core 14.

[0038] Specifically, there is a gap of 0.02mm between the second core and the third core, and between the third core and the fourth core, to ensure that the gas can be smoothly drained.

[0039] In the embodiment, the exhaust structure is integrated with the molding core, so that the injection punch has the functions of double-layer structure molding and multi-stage exhaust, thereby improving the space utilization of the injection mold. Second, the first-stage exhaust structure is used to drain the gas inside the inner layer of the product, the second-stage exhaust structure is used to drain the gas between the inner and outer layers of the product, and the third-stage exhaust structure is used to drain the gas outside the outer layer of the product. Through the combined action of the multi-stage exhaust structure, the gas is drained in stages and in different areas, thereby ensuring that the gas in the injection space can be fully drained and avoiding the accumulation of gas leading to product defects.

[0040] Further, the first-stage exhaust structure 51 and the second-stage exhaust structure 52 are each provided with a first drainage channel 6 for draining gas and a first exhaust channel 7 for draining gas. The first drainage channel 6 and the first exhaust channel 7 are in communication.

[0041] Specifically, the first-stage exhaust structure 51 is provided with a first drainage channel 61 for draining gas and two first exhaust channels 71 for draining gas; and the second-stage exhaust structure 52 is provided with a first drainage channel 62 for draining gas and two first exhaust channels 72 for draining gas. The first drainage channel 61 and the first drainage channel 62 are annular channels. The two first exhaust channels 71 are symmetrically arranged along the central axis of the second core 12, the two first exhaust channels 72 are symmetrically arranged along the central axis of the third core 13, and the two first exhaust channels 71 and the two first exhaust channels 72 are arranged in a staggered manner.

[0042] In the embodiment, the gas is collected and drained through the first drainage channel to the first exhaust channel, and the gas is discharged through the first exhaust channel. By arranging the first exhaust channels with symmetrical exhaust structures, the two side areas of the core can be covered, so that the gas can be uniformly discharged, avoiding local gas accumulation caused by one-sided exhaust or core deviation or deformation caused by one-sided stress. By arranging the first exhaust channels with different exhaust structures, the uneven stress between adjacent cores can be avoided.

[0043] In use of the embodiment, the gas flows through the gap between the cores, is collected in the channel through the first drainage channel, and is drained to the first exhaust channel through the first drainage channel and discharged.

[0044] Further, the third exhaust structure 53 is provided with a plurality of exhaust holes 8 for buffering gas, a second drainage channel 9 for draining the gas of the exhaust holes 8, and a second exhaust channel 10 for discharging the gas. The second drainage channel 9 and the second exhaust channel 10 are in communication.

[0045] Specifically, the third exhaust structure 53 is provided with four second drainage channels 9 and four second exhaust channels 10. The second drainage channels and the second exhaust channels are arranged symmetrically along the central axis of the fourth core 14.

[0046] In the embodiment, by arranging a plurality of exhaust holes as a gas buffer area, material overflow or flash caused by sudden pressure increase can be avoided. The gas is drained to the second exhaust channel through the second drainage channel, and then discharged.

[0047] In use of the embodiment, the gas flows through the gap between the exhaust holes and the core, is collected in the second exhaust channel through the second drainage channel, and is discharged through the second exhaust channel.

[0048] Further, the first core 11 is provided with a first molding block 111 for molding and a first molding groove 112 arranged on the first molding block 111.

[0049] In the embodiment, the first molding block cooperates with the injection mold recess to form an outer structure, and the first molding groove forms an inner structure of the product.

[0050] Further, the second core 12 is provided with a plurality of molding protrusions 121 for molding.

[0051] In the embodiment, the plurality of molding protrusions form an inner structure of the product.

[0052] Further, the third core 13 is provided with a second molding block 131 for molding and a plurality of second molding grooves 132 arranged on the second molding block 131.

[0053] In the embodiment, the outer layer structure of the product is formed by the second forming block cooperating with the injection mold cavity, and the outer side structure of the inner layer of the product is formed by the second forming groove.

[0054] Further, the injection assembly 3 comprises an injection part 31 for injecting material and a reset part 32 for forming and resetting.

[0055] Further, the injection part 31 and the reset part 32 are provided with an injection channel 20 for injecting material, and the reset part 32 is further provided with a reset space 321 for accommodating a ejector pin 30.

[0056] In the embodiment, the injection channel is arranged from the injection part to the reset part, so that the injection material can be injected into the cavity and gradually filled outward, cooperating with the multi-stage exhaust structure, to ensure that the gas in the injection space can be fully discharged, avoid the accumulation of gas causing product defects, and improve the yield of the product. The reset space is arranged in the reset part to accommodate the ejector pin, and the ejector pin is used to eject the product from the center position, so as to realize uniform demolding of the product.

[0057] The double-layer injection mold with exhaust performance has the functions of double-layer structure forming and multi-stage exhaust by integrating and optimizing the design of the core of the injection punch and the exhaust structure, and realizes the forming of the double-layer structure injection product by cooperating the injection punch, the injection cavity and the injection assembly, and realizes the phased and regional exhaust of gas, so as to ensure that the gas in the injection space can be fully discharged, avoid the accumulation of gas causing product defects, and solve the problem that the traditional single exhaust structure cannot meet the phased and regional exhaust requirements of complex structure parts.

[0058] The above is the embodiment provided in combination with the specific content, and the specific implementation of the utility model is not limited to these descriptions, and the utility model is not limited to the above naming and English naming. Any method, structure or the like similar to or identical to the utility model, or any technical deduction or replacement made under the premise of the concept of the utility model, should be regarded as the protection scope of the utility model.

Claims

1. A double-layer injection mold with exhaust performance, comprising an injection male mold (1) and an injection female mold (2) for molding, and an injection assembly (3) penetrating through the injection female mold (2), characterized in that: The injection convex die (1), the injection concave die (2) and the injection assembly (3) form an injection space (4), and the injection convex die (1) is provided with an exhaust structure (5) for exhausting the injection space (4).

2. The double-layer injection mold having a venting performance according to claim 1, wherein: The injection convex die (1) comprises a first core (11) abutting against the injection assembly (3), a second core (12) and a third core (13) for molding, and a fourth core (14) abutting against the injection concave die (2).

3. The double-layer injection mold having a venting function according to claim 2, wherein: The exhaust structure (5) comprises a first-stage exhaust structure (51) provided on the second core (12), a second-stage exhaust structure (52) provided on the third core (13), and a third-stage exhaust structure (53) provided on the fourth core (14).

4. The double-layer injection mold having a venting function according to claim 3, wherein: The first-stage exhaust structure (51) and the second-stage exhaust structure (52) are each provided with a first flow channel (6) for guiding gas and a first exhaust channel (7) for exhausting gas.

5. The double-layer injection mold having a venting function according to claim 3, wherein: The third-stage exhaust structure (53) is provided with a plurality of exhaust holes (8) for buffering gas, a second flow channel (9) for guiding gas of the exhaust holes (8), and a second exhaust channel (10) for exhausting gas.

6. The double-layer injection mold having a venting function according to claim 2, wherein: The first core (11) is provided with a first molding block (111) for molding and a first molding groove (112) provided on the first molding block (111).

7. The double-layer injection mold having a venting function according to claim 2, wherein: The second core (12) is provided with a plurality of molding convex strips (121) for molding.

8. The double-layer injection mold having a venting function according to claim 2, wherein: The third core (13) is provided with a second molding block (131) for molding and a plurality of second molding grooves (132) provided on the second molding block (131).

9. The double-layer injection mold having a venting function according to claim 1, wherein: The injection assembly (3) comprises an injection part (31) for injecting material and a reset part (32) for molding and resetting.

10. The double-layer injection mold having a venting function according to claim 9, wherein: The injection part (31) and the reset part (32) are provided with an injection channel (20) for injecting material, and the reset part (32) is further provided with a reset space (321) for accommodating a ejector pin.

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