Classification of forming molds

Update:21-06-2019
Summary:

A mold that is scaled according to the shape and struct […]

A mold that is scaled according to the shape and structure of the object, and which is a tool for forming a shape by pressing or watering, and is generally used for plastic processing. The pre-made plastic sheet is pressed around the periphery of the mold, heated to soften it, and then vacuumed on one side of the mold, or compressed air on the reverse side to make the plastic sheet adhere to the mold; cooling and setting After that, the product was obtained. The plastic raw material is added to the preheating feeding chamber, and then the pressure is applied to the pressing column. The plastic is melted under high temperature and high pressure, and enters the cavity through the casting system of the mold, and is gradually hardened. This molding method is called die casting molding, and the mold used is used. Called die casting mold.
classification
1. Injection molding die
The plastic is first heated and melted in the heating barrel of the injection molding machine, and then pushed into the mold cavity through the nozzle and mold casting system under the push of the injection machine screw or piston, and finally hardened and shaped in the cavity, which is a simple process of injection molding. The mold used for injection molding is called an injection molding mold. Injection molds are mainly used for the molding of thermoplastic products, but in recent years, they are increasingly used for the formation of thermosetting plastics. Injection molding accounts for a large proportion of the molding of plastic products, so about half of the production of plastic molding dies is injection molding. Injection molding dies are often used in TV housings, keyboard buttons, and more.
2, extrusion molding
Also known as the nose. The plastic in a viscous state is passed through a die having a specific cross-sectional shape under high temperature and high pressure, and then cooled and shaped at a lower temperature, and a molding method for producing a continuous profile having a desired cross-sectional shape is called extrusion molding. The mold for extrusion molding of plastic is called extrusion molding die. Commonly used in bakelite switches, porcelain dishes and other products.
3. Press molding die
Referred to as the stamper. The plastic raw material is directly added into the open mold cavity, and then the mold is closed, the plastic becomes flowing under the action of heat and pressure and fills the cavity; then the plastic is hardened and shaped due to chemical or physical changes, and the method is called pressing Molding, and the mold used is called a press forming mold. Most of these molds are used in the molding of thermoset plastics, as well as in thermoplastics. There is also a cold press forming press mold which is not heated for forming a polytetrafluoroethylene blank.
4, hollow product blow molding die
The extruded or injection-molded tubular blank is placed in the mold cavity, and compressed air is immediately introduced into the center of the blank to expand the tube blank and adhere to the mold cavity wall to cool and harden. After that, it became a hollow product. The mold used in this molding method is a blow molding mold for hollow products.
5, vacuum or compressed air molding die
This is a separate female or male model. The pre-made plastic sheet is pressed around the periphery of the mold, heated to soften it, and then vacuumed on one side of the mold, or compressed air on the reverse side to make the plastic sheet adhere to the mold; cooling and setting After that, the product was obtained. The mold of this molding method is less stressed, less demanding, and can even be made of non-metallic materials.
6, die casting mold
Also known as transfer molding die. The plastic raw material is added to the preheating feeding chamber, and then the pressure is applied to the pressing column. The plastic is melted under high temperature and high pressure, and enters the cavity through the casting system of the mold, and is gradually hardened. This molding method is called die casting molding, and the mold used is used. Called die casting mold. This kind of mold is mostly used for the molding of thermosetting plastics.
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