The machining quality of Pipe Fittings Mould includes two aspects: machining accuracy and surface quality. Machining accuracy is the degree of conformity between the actual size, shape and position of the machined part surface and the ideal geometric parameters required by drawings. It and machining error machining are both geometric parameters for measuring the machined surface of pipe fittings.
Usually, the machining accuracy of pipe fittings mould is measured by tolerance grade, and the smaller the grade value, the higher its accuracy; The machining error is expressed by numerical value, and the larger the numerical value, the greater the error. High machining accuracy means small machining error, and vice versa. It is necessary to know that the actual parameters obtained by any machining method are not absolutely accurate. From the function of parts, as long as the machining error is within the tolerance range required by the part drawing, the machining accuracy is considered. The surface quality of pipe fittings mould depends on the machining quality of parts and the assembly quality of machines. The machining quality of parts is also composed of machining accuracy and surface quality, and the main factor affecting machining accuracy is dimensional accuracy.
There are also the properties of the processing materials used for injection moulding of pipe fittings, which require high hardness of steel materials; At the same time, it is also required that the pipe fittings mould processing equipment have thermal stability and high reliability. For complex cavities and multifunctional compound mould, with the complexity of the shape of the parts, it is necessary to improve the design and manufacturing level of pipe fittings mould.
The size of injection moulding process must not only meet the requirements of use and installation, but also consider the manufacturing of Household appliances mould, equipment performance and raw material flow. Strictly control the factors that affect the precision of injection moulded parts, including the manufacturing precision of household appliances mould, plastic composition and process conditions.
The surface roughness of the injection moulding process depends on the surface roughness of the household appliances mould, so the surface roughness of the household appliances mould is one level lower than that of the product, and it can meet the requirements through grinding and polishing. Injection moulded parts will produce cooling shrinkage in the mould cavity, which makes it difficult to take out injection moulded parts. Therefore, in order to promote demoulding, it is necessary to consider that the inner and outer surfaces parallel to the demoulding direction have sufficient demoulding slope.
Injection moulding is a moulding method of injection mould. The advantages of injection moulding are fast production speed, high efficiency, automatic operation, various colors, size from large to small, easy replacement of product size and complex shape.
Injection moulding is an industry with strong technical and practical ability. In the process of injection moulding, plastic raw materials, carbon powder, nozzles, moulds, injection moulding machines, peripheral equipment, fixtures, sprayers, various auxiliary materials and packaging materials are used. These have brought great achievements to the management of injection workshop. Compared with other industries or departments, there are some difficulties, and the requirements of injection moulding workshop managers at all levels are higher.
Although the structure of household appliances mould may be different due to the type and performance of plastics, the shape and structure of plastic products and the type of injection moulding machine, the basic structure is the same. The household appliances mould is mainly composed of gating system, temperature control system, forming parts and structural parts. The gating system and moulded parts are in direct contact with plastics and change with plastics and products. They are relatively complex and variable parts in household appliances mould, which require high-precision parts.
Whether the design of Table Mould is reasonable or not will directly affect the quality of plastic products. Because the cavity size of the table mould is obtained from the required size of plastic products plus the shrinkage rate of the materials used, and the shrinkage rate is often a value within a range recommended by plastic manufacturers or engineering plastics manuals, which is not only related to the gate form, gate position and distribution of the table mould, but also related to the crystalline orientation (anisotropy) of engineering plastics, the shape and size of plastic products and the distance and position from the gate. The main factors affecting the shrinkage of plastics include thermal shrinkage, phase change shrinkage, orientation shrinkage, compression shrinkage and elastic recovery, which are related to the moulding conditions or operating conditions of precision injection moulding products.
Therefore, the designer of table mould must have rich experience in design and injection moulding, and must consider the relationship between these factors and injection conditions and their apparent factors, such as injection pressure, cavity pressure and filling speed, injection melt temperature and mould temperature, mould structure and gate form and distribution, as well as gate cross-sectional area, product wall thickness, reinforcing filler content in plastic materials, crystallinity and orientation of plastic materials, etc. The influence of the above factors is also different due to different plastic materials or other moulding conditions such as temperature, humidity, continuous crystallization, internal stress after moulding, and changes of injection moulding machine.