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Ceramic Technology
Analysis of factors affecting precision ceramic injection molding
Time: 2020-10-30   Writer: mingrui

Analysis of factors affecting precision ceramic injection molding of mold

Precision ceramic injection molding will be affected by many related factors and environmental conditions, and the most basic factors are ceramic materials, ceramic injection mold, ceramic injection molding process and ceramic injection molding equipment.In the early stage of designing ceramic products, engineering ceramic materials are selected according to their environment.Secondly, the appropriate injection molding machine is selected based on the selected ceramic material, dimensional accuracy of the finished product, weight and quality requirements of the parts, as well as the anticipated mold structure.

Among the factors affecting the injection molding of precision ceramics, the mold is the key to obtain the precise ceramic products that meet the quality requirements.Mold design, mold design is reasonable will directly affect the quality of ceramic products.

Due to the mold cavity dimension is made by ceramic products required size and shrinkage of the materials used, and the shrinkage rate is often or engineering ceramics by the ceramic manufacturer manual recommends a range of values, it not only with the mold gate forms, gate location and distribution, and crystal orientation of engineering ceramics (anisotropic), ceramic products shape, size of the position and the distance to the gate.

The main factors affecting the shrinkage of ceramics include thermal shrinkage, phase change shrinkage, orientation shrinkage, compression shrinkage and elastic recovery etc. These factors are related to the forming conditions or operating conditions of precision injection products.

Mold designers, therefore, must have a rich experience in design and injection molding, these factors must be considered and the relationship between injection molding conditions and its apparent factors, such as the injection pressure and cavity pressure and the filling speed, melt temperature and mold temperature, injection mold structure and gate forms and distribution of products as well as the gate area, wall thickness, ceramic materials, ceramic materials content of reinforcing filler in the impact of factors such as crystallinity and orientation.

The effects of these factors also vary with ceramic materials, or with other molding conditions such as temperature, humidity, continued crystallization, and the injection molding machine after the molding.

Injection molding is the process of changing ceramics from solid (powder or grain) to liquid (melt) and solid (product).From the particle to the melt, from the melt to the product, through the temperature field, flow field and density field.Under the joint action of these fields, different ceramics (thermosetting or thermoplastic, crystalline or non-crystalline, enhanced or non-enhanced, etc.) have different polymer structure and morphology and rheological properties.

All the factors affecting the above "field" will certainly affect the physical and mechanical properties, size, shape, precision and appearance quality of ceramic products.

In this way, the intrinsic connections between process factors and polymer properties, structural morphology, and ceramic products are expressed through ceramic products.The analysis of these internal relations is of great significance to reasonably draw up injection molding processing technology, rationally design and manufacture molds according to drawings, and even rationally select injection molding processing equipment.

There are also differences between precision injection and ordinary injection in injection pressure and injection rate. High pressure or ultra high pressure injection and high speed injection are often used in precision injection to obtain a smaller shrinkage rate.

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