| 塑料压塑模具 |
| 添加时间：2020/8/7 16:54:35 浏览次数： |
| 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。 There are two types of structural mold, compression molding and injection molding. They are mainly used for molding thermosetting plastics, the corresponding equipment is the pressure molding machine. Compression molding method according to the characteristics of the plastic, the mold is heated to the molding temperature (generally 103 ° - 108 ℃), and then the metered powder is put into the mold cavity and the feeding chamber, and the mold is closed. Under the action of high heat and high pressure, the plastic is softened and viscous flow, and after a certain period of time, it is solidified to form the required product shape. The difference between pressure injection molding and compression molding is that there is a separate feeding chamber, the mold is closed before molding, the plastic is preheated in the feeding chamber, and the plastic is in viscous flow state. Under the action of pressure, it is adjusted and squeezed into the mold cavity for hardening. Compression moulds are also used to form some special thermoplastic plastics, such as refractory thermoplastic (such as polyvinylidene fluoride) blanks (cold pressing), resin lenses with high optical properties, slightly foamed nitrocellulose automobile steering wheel, etc. The compression mold is mainly composed of cavity, feeding cavity, guiding mechanism, ejecting parts, heating system, etc. Injection mold is widely used in packaging electrical components. The material used in the manufacturing of the compression mould is basically the same as that of the injection mould. |
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