자동차 산업의 발전에, 플라스틱 부품에 대한 수요가 나날이 증가하고 있습니다., 플라스틱 부품에 대한 자동차 구성의 적용이 매우 높기 때문에, 즉 말하자면, 플라스틱 부품의 품질은 자동차 산업의 발전과 건설을 촉진하는 데 큰 역할을 합니다., 품질 보증이 필요한 플라스틱 부품의 생산을 요하는, 플라스틱 부품의 품질을 결정합니다.. 금형이다. There are not a few cases that the plastic parts produced by the mold cause losses in various fields in the application process. 따라서, it is very helpful to the economic development of our country to study the mold for the production of plastic parts in order to improve the quality and efficiency of the plastic parts.
We all know that automotive are very dependent on the application of plastic parts. 동시에, automotive products are constantly updated. Only by grasping the key and difficult points in the production of plastic parts, can the mold production meet the development needs of the automotive industry.
Foundation of injection mold design
1.1 plastic product design is the key.
Plastic products are absolutely a key link in the design of injection mold. The design of plastic products, its requirement is to simplify the model of plastic products as much as possible, especially the design of depression and undulation should not appear in the design of plastic products.
The requirement of simplicity in design of plastic products is a general direction, because there are many small links in the design of plastic products. Simplified design is the requirement of every fine links of plastic products. On the basis of this requirement, the basic requirements of each link can be met, such as the design of thin and thick injection molds. Evolution should be made at the same time as possible to achieve uniform die wall thickness, avoid inappropriate thickness uneven glue position. The stiffness and hardness also need to meet the standards, which is a key link to ensure the quality of plastic parts.
1.2 classification of plastic products in structural design
The inside and outside sides of plastic products should have the release angle that meets the standard of release, which is more conducive to mold release. In order to make its appearance smooth and free from friction, plastic products are streamlined and smooth as far as possible in radian and texture. Plastic products have sharp edges and corners, these corners are rounded, for the radian problem in the plastic products on both sides of the circumferential angle, radian tension should be greater, this is very necessary.
The basic requirements of a molding tool for parts
In the strength and hardness to reach a certain standard, otherwise can not stand friction, will affect the quality of construction, hardness requirements can not be lower than HRC35, very special requirements in the hardness of 50-52 HRC or more, the product after molding to make its surface gloss, can be achieved by polishing, in addition to the need for polishing is also In the cavity part, the sample of the product can not deviate from the requirements of the product, and then through management and construction technology to improve production efficiency and save costs.
Clear cavity number
The method of determining the number of cavities can be used by all the injection machines, and then the number of cavities can be determined by the amount of injection and the rated clamping force of the injection machine. Other factors, such as molding process, precision and maintenance, as well as economy, are also needed in the process of cavity number.
Recognition of fractal line and mold parting surface
The method of determining fractal line can be determined according to the shape of the part. The function of fractal line is to divide the product into two parts, and the existence of the boundary line is the same. The two parts are located in the fixed mold, and the other part is in the dynamic mold. The fractal line can be used to obtain the parting surface of the mold, and the parting surface of the mold can be determined by scanning the fractal line around the two molds.
4.1 Points for attention in design of parting surface
Step parting surface, in the face of step parting surface generally need to be 3-5 degrees of interpolation angle, angle can not be less than 1.5 학위. Sometimes more than one step surface appears in a parting surface. 이 경우, the angle A is acted at the same angle, which makes the machining easier and more convenient.
The parting surface of the mold needs special attention, 그건, to ensure that each surface has a sealing distance, but also need to ensure the effectiveness of the distance, so that plastic melt can not easily flow out during the injection process, the name of sealing distance is due to this efficiency and the corresponding, can block the material. In the process of creating a parting surface, if a parting surface, such as a curved surface or an inclined surface, or a step, has a large height difference, whether it is one or more, it must be set a reference plane, so that it can be easily processed and measured.
4.2 basic principles of parting design
Molding plastics need to be retained on the semi-mold after the opening of the mold, 물론이야, this is in the case of a push-out mechanism as a prerequisite, the general appearance of the push-out mechanism semi-mold is a dynamic mold, only in very special cases appear in the push-out mechanism semi-mold on the fixed mold.
Some plastic products will be attached with metal inserts, because inserts do not have the function of shrinkage wrapping punch, shape cavity design is usually on the side of the moving die, if not set, the opening of the mold will make the plastic products in the fixed mold area, once this happens, demoulding will become very difficult. If the coaxiality structure is formed on both sides of the two models, the accuracy of the coaxiality can not be guaranteed. This situation is mostly due to manufacturing errors and assembly errors.
There is a certain requirement for the locking of the mold, which must be met. In order to meet the requirement, plastics are usually placed at the closure of the dynamic quantitative mold.
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문의처:
담당자: 제임스 위안
회사 이름: JasonMould 산업 회사 제한
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