录音机塑料手柄成型的旧工艺是采用装有金属嵌件注塑的(见图1a),这种方法模具制造周期长、体积大、成本高、效率低,不能适应大批量生产。现在塑料手柄采用真空成型工艺制成型材再组装而成(见图1b),模具结构简单、体积小、制造周期短、成本低、操作方便,手柄长度可以按需要尺寸截取,适用于大批量生产。一、机床注塑机床为一般螺旋式挤出机,装上安装模具 The old process of forming the plastic handle of the recorder is the injection molding with a metal insert (see FIG. 1a). This method has the advantages of long manufacturing cycle, large volume, high cost, low efficiency and can not be adapted to mass production. Now the plastic handle is made by vacuum forming process and then re-assembled into profiles (see Figure 1b). The mold has the advantages of simple structure, small volume, short manufacturing cycle, low cost and convenient operation. The length of the handle can be cut according to the required size and is suitable for mass production . First, the injection molding machine tool for the general spiral extruder, fitted with mounting mold