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塑料压塑模具
Plastic Compression Mold
包括压缩成型和压注成型两种结构模具类型。它们是主要用来成型热固性塑料的一类模具，其所对应的设备是压力成型机。压缩成型方法根据塑料特性，将模具加热至成型温度(一般在103°-108°)，然后将计量好的压塑粉放入模具型腔和加料室，闭合模具，塑料在高热，高压作用下呈软化粘流，经一定时间后固化定型，成为所需制品形状。压注成型与压缩成型不同的是有单独的加料室，成型前模具先闭合，塑料在加料室内完成预热呈粘流态，在压力作用下调整挤入模具型腔，硬化成型。压缩模具也用来成型某些特殊的热塑性塑料如难以熔融的热塑性塑料(如聚加氟乙烯)毛坯(冷压成型)，光学性能很高的树脂镜片，轻微发泡的硝酸纤维素汽车方向盘等。压塑模具主要由型腔、加料腔、导向机构、推出部件、加热系统等组成。压注模具广泛用于封装电器元件方面。压塑模具制造所用材质与注射模具基本相同。
It includes compression and injection moulding. They are mainly used to form thermosetting plastic molds, and the corresponding equipment is the pressure moulding machine. According to the characteristics of plastics, the mould is heated to the forming temperature (usually 103-108 degrees). Then the measured powder is put into the cavity and charging room of the mould to close the mould. Under the action of high heat and high pressure, the plastics are softened and viscous flow. After a certain period of time, the mould is solidified and shaped to become the required shape of the product. Different from compression moulding, injection moulding has a separate feeding chamber. Before moulding, the mould closes first, and the plastic preheates in the feeding chamber in a viscous flow state. Under the action of pressure, it is adjusted to squeeze into the die cavity and harden. Compression moulds are also used to form some special thermoplastics, such as thermoplastics (such as polyvinyl fluoride) blanks (cold pressing), resin lenses with high optical properties, slightly foamed cellulose nitrate steering wheel, etc. Compression mold is mainly composed of cavity, feeding cavity, guiding mechanism, pushing parts, heating system and so on. Injection moulds are widely used in packaging electrical components. The material used in the manufacture of compression moulds is basically the same as that of injection moulds.