Injection mold with internal exhaust function

Abstract

The utility model relates to the technical field of injection molding devices, and provides an injection mold with an internal exhaust function. The movable mold assembly movably abuts against the fixed mold assembly, and when the movable mold assembly abuts against the fixed mold assembly, a product cavity is formed between the movable mold assembly and the fixed mold assembly; the insert is provided with an at least local ventilation part, the ventilation part is provided with a profiling surface facing the product cavity, and the profiling surface is used for forming at least a local structure of the product cavity. Compared with the prior art, the injection mold has the advantages that the insert which is at least partially provided with the ventilation part is arranged in the injection mold, and gas in the mold is pumped out in advance before feeding of the injection mold. On the premise that the dwell pressure and the injection speed in the injection molding process are reduced, the appearance of the surface cover can meet the design requirement. Moreover, after the dwell pressure is reduced, the parting surface of the injection mold can be prevented from flashing, the production procedures of the surface cover are reduced, and the manufacturing cost of the surface cover is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to injection molding device technical field, concretely is an injection mold with internal exhaust function. BACKGROUND

[0002] The automobile oil filling small door and electric vehicle charging port both have surface coverings that are coplanar with the vehicle body. The surface coverings, as the appearance parts of the small doors, have very high appearance requirements and are usually formed by injection molding.

[0003] In the injection molding process of the conventional surface covering injection molding process, in order to ensure that the surface of the surface covering is free of shrink marks and material defects, high pressure holding and high speed injection molding are required for the surface covering. However, high pressure holding operation can cause the parting surface of the conventional injection molding mold to produce a flash, and after the surface covering is injection molded, an additional surface polishing process is required, which increases the production cost of the surface covering. Due to the high speed of high speed injection molding, the air in the product cavity cannot be discharged in time, resulting in burning and air trapping at the end of the surface covering. SUMMARY

[0004] The utility model solves the technical problem to be solved in the prior art and provides an injection mold with internal exhaust function.

[0005] The utility model adopts the technical scheme to solve the above technical problem: an injection mold with internal exhaust function is provided, which comprises: a fixed mold assembly;

[0006] A movable mold assembly movably abuts against the fixed mold assembly, and a product cavity is formed between the movable mold assembly and the fixed mold assembly when they abut against each other;

[0007] An insert has at least a partial air-permeable portion, the air-permeable portion allows the gas in the cavity to pass through, the air-permeable portion has a contoured surface facing the product cavity, the contoured surface is used to form at least a partial structure of the product cavity, and the insert has at least an air extraction state.

[0008] When the insert is in the air extraction state, the air in the product cavity is extracted.

[0009] In the above-mentioned injection mold with internal exhaust function, the insert comprises a base, the air-permeable portion is integrally formed with the base, a gas passage is formed between the base and the air-permeable portion, and one end of the gas passage extends to the surface of the base for connecting a gas source.

[0010] In the above-mentioned injection mold with internal exhaust function, a plurality of air-permeable gaps, one end of each of which communicates with the gas passage, are provided on the air-permeable portion.

[0011] The venting gap has a width of 0.03-0.05mm.

[0012] The venting part and the base are formed by 3D printing technology, and the raw material of the venting part is venting steel.

[0013] The insert is embedded on the fixed die assembly and located at the end of the flow path of the injection material in the product cavity.

[0014] The insert is embedded on the fixed die assembly and located at the end of the flow path of the injection material in the product cavity.

[0015] The insert further comprises a base, the base is threadedly connected between the base and the cavity insert block, and the base is connected to the cavity insert block.

[0016] Compared with the prior art, the injection mold has the advantages that the gas in the mold is extracted in advance before the injection mold is fed, the appearance of the face cover can meet the design requirements under the premise of reducing the holding pressure and the injection speed in the injection process, the flash of the parting surface of the injection mold can be prevented after the holding pressure is reduced, the production process of the face cover is reduced, and the manufacturing cost of the face cover is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a partial structure of the injection mold with internal venting function of the utility model;

[0018] Figure 2 is Figure 1 the plan view in the figure;

[0019] Figure 3 is Figure 2 the sectional view of A-A in the figure.

[0020] In the figure, 1, the movable die assembly; 2, the insert; 3, the venting part; 4, the base; 5, the gas channel; 6, the base; 7, the cavity insert block. DETAILED DESCRIPTION

[0021] The following is a specific embodiment of the utility model and is further described in conjunction with the drawings, but the utility model is not limited to these embodiments.

[0022] As Figures 1 to 3As shown, an injection mold with internal exhaust function of the present invention includes: a fixed mold component, a movable mold component 1, and an insert 2.

[0023] Specifically, the movable mold assembly 1 and the fixed mold assembly are movably abutted against each other. When the movable mold assembly 1 and the fixed mold assembly abut against each other, a product cavity is formed between the two; the insert 2 has at least a partial air permeable portion 3, and the air permeable portion 3 can allow the gas in the cavity to pass through. The air permeable portion 3 has a contour surface facing the product cavity, and the contour surface is used to form at least a partial structure of the product cavity. The insert 2 has at least a vacuum state; when the insert 2 is in the vacuum state, it is used to remove the air in the product cavity.

[0024] The fixed mold assembly and the movable mold assembly 1 are respectively connected to the fixed part and the movable part of the injection molding machine. The movable part of the injection molding machine drives the movable mold assembly 1 to move closer to or away from the fixed mold assembly, thereby realizing the movable abutment between the fixed mold assembly and the movable mold assembly 1.

[0025] During operation, the active portion of the injection molding machine drives the movable mold assembly 1 against the fixed mold assembly, placing the injection mold in a closed state. Before the injection molding machine injects the molten material into the product cavity, the insert 2 is first placed in a vacuum state to remove the gas from the product cavity. This allows the injection mold of this solution to form the cover within the product cavity without injection defects such as sink marks and missing material, even at relatively low holding pressures and injection speeds.

[0026] In this solution, by installing an insert 2 with at least a partially permeable portion 3 in the injection mold, air within the mold is extracted before material is introduced. This reduces the holding pressure and injection speed during the injection molding process, ensuring that the appearance of the cover meets design requirements. Furthermore, reducing the holding pressure prevents flash on the parting surface of the injection mold, reducing the number of production steps and manufacturing costs.

[0027] The insert 2 includes a base 4 , and the air permeable portion 3 and the base 4 are integrally formed. A gas channel 5 is formed between the base 4 and the air permeable portion 3 , and one end of the gas channel 5 extends to the surface of the base 4 for connecting to a gas source.

[0028] After the gas channel 5 is connected to the gas source, the gas source makes the pressure in the gas channel 5 lower than the pressure in the product cavity, thereby forming a pressure difference between the product cavity and the gas channel 5, so that the gas in the product cavity can be discharged through the air permeable part 3, thereby realizing the vacuum state of the insert.

[0029] Preferably, the vent portion 3 is provided with a plurality of vent gaps, one end of each of which is connected to the gas channel 5 , for realizing the venting function of the vent portion 3 .

[0030] Furthermore, the width of the ventilation gap is set to 0.03-0.05 mm, so that the ventilation portion 3 allows gas to pass through while preventing moisture and molten injection molding material from passing through, thereby ensuring the normal production process of the cover.

[0031] The vent portion 3 and the base 4 are both produced by 3D printing technology, and the raw material of the vent portion 3 is exhaust steel.

[0032] Vent steel is a special mold steel with tiny pores within it. The venting portion 3, created by 3D printing with vent steel, helps to vent gases from the mold cavity. Vent steel is formed through a specialized manufacturing process—typically powder metallurgy—by sintering fine stainless steel spheres at high temperatures, creating a uniform distribution of tiny vent holes within the steel.

[0033] The insert 2 can be embedded in the movable mold assembly 1 or in the fixed mold assembly. During the injection molding process, the gas will gather at the end of the injection molding material flow path as the injection molding material flows in the product cavity. Therefore, in this solution, whether the insert 2 is on the movable mold assembly 1 or the fixed mold assembly, it is located at the end of the injection molding material flow path in the product cavity, so as to increase the exhaust efficiency of the insert 2.

[0034] The insert 2 also includes a base 6, which is threadedly connected to the base 4. The movable mold assembly 1 includes a cavity insert 7, and the base 6 and the cavity insert 7 are connected by a hanging platform for fixing the insert 2 on the movable mold assembly 1.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship and movement status of the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, terms such as "first," "second," and "an" in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0037] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0038] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0039] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described, or replace them with similar methods, without departing from the scope defined by the spirit of the present invention.

Claims

1. An injection mold with internal exhaust function, characterized in that: include: Fixed mold assembly; a movable mold assembly, which is movably in contact with the fixed mold assembly, and a product cavity is formed between the movable mold assembly and the fixed mold assembly when the movable mold assembly and the fixed mold assembly are in contact; An insert having at least a partial ventilating portion, the insert including a base, the ventilating portion and the base both being generated by 3D printing technology, the ventilating portion being made of exhaust steel, the ventilating portion being capable of allowing gas in the cavity to pass through, the ventilating portion having a contoured surface facing the product cavity, the contoured surface being used to form at least a partial structure of the product cavity, the ventilating portion being integrally formed with the base, a gas channel being formed between the base and the ventilating portion, one end of the gas channel extending to the surface of the base for connection to a gas source, the ventilating portion being provided with a plurality of ventilating gaps each having one end connected to the gas channel, the width of the ventilating gap being 0.03 to 0.05 mm, and the insert having at least an evacuation state; When the insert is in the exhaust state, it is used to exhaust the air in the product cavity.

2. The injection mold with internal exhaust function according to claim 1, characterized in that: The insert is embedded in the movable mold component and is located at the end of the flow path of the injection molding raw material in the product cavity.

3. The injection mold with internal exhaust function according to claim 1, characterized in that: The insert is embedded in the fixed mold component and is located at the end of the flow path of the injection molding raw material in the product cavity.

4. The injection mold with internal exhaust function according to claim 2, characterized in that: The insert also includes a base, which is threadedly connected to the base. The movable mold assembly includes a cavity insert, and the base and the cavity insert are connected by a hanging platform.

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