Plastic Molds and Stamping Die Molds for Auto Parts

1. Plastic injection (plastic) mold
It is mainly a molding mold that is most commonly used in the production of thermoplastic parts. The processing equipment corresponding to the plastic injection mold is a plastic injection molding machine. The plastic is first heated and melted in the heating barrel at the bottom of the injection machine, and then the screw Or driven by the plunger, it enters the mold cavity through the injection machine nozzle and the pouring system of the mold, and the plastic is cooled and hardened to form, and demolded to obtain the product. Its structure usually consists of forming parts, pouring system, guiding parts, pushing mechanism, temperature regulation system, exhaust system, supporting parts and other parts. The manufacturing materials usually use plastic mold steel modules, and the commonly used materials are mainly carbon structural steel, carbon tool steel, alloy tool steel, high-speed steel, etc. The injection molding process is usually only suitable for the production of thermoplastic products. The plastic products produced by the injection molding process are very wide, ranging from daily necessities to various complex machinery, electrical appliances, and transportation parts. It is the most widely used processing method in the production of plastic products.
2. Plastic compression mould
Including compression molding and injection molding two structural mold types. They are a type of mold mainly used to mold thermosetting plastics, and their corresponding equipment is a press molding machine. Compression molding method According to the characteristics of the plastic, the mold is heated to the molding temperature (usually 103°-108°), and then the measured compression molding powder is put into the mold cavity and the feeding chamber, the mold is closed, and the plastic is under high heat and high pressure. It is softened and viscous flow, and after a certain period of time, it will be solidified and shaped into the desired shape of the product. The difference between injection molding and compression molding is that there is a separate feeding chamber. Before molding, the mold is closed first. The plastic is preheated in the feeding chamber and is in a viscous flow state. Under the action of pressure, it is adjusted and squeezed into the mold cavity to harden and form. Compression molds are also used to form some special thermoplastics such as hard-to-melt thermoplastics (such as polyvinyl fluoride) blanks (cold pressing), resin lenses with high optical properties, slightly foamed nitrocellulose car steering wheels, etc. . The compression mold is mainly composed of cavity, feeding cavity, guiding mechanism, ejecting parts, heating system, etc. Injection molds are widely used in packaging electrical components. The materials used in the manufacture of compression molds are basically the same as injection molds.

  

Stamping die is a special process equipment that processes materials (metal or non-metal) into parts (or semi-finished products) in cold stamping, called cold stamping die (commonly known as cold stamping die). Stamping is a pressure processing method that uses a die installed on a press to apply pressure to a material at room temperature to separate or plastically deform it, thereby obtaining the required parts.
 cording to the degree of process combination
a. Single-process die In one stroke of the press, only one stamping process is completed.
b. The compound mold has only one station, and in one stroke of the press, two or more stamping processes are completed at the same station at the same time.
c. Progressive die (also known as continuous die) has two or more stations in the feeding direction of the blank, and in one stroke of the press, two or more passes are completed at different stations one after another. The die for the above stamping process.
d. The transfer mold combines the characteristics of single-process mold and progressive mold, and uses the manipulator transfer system to realize the rapid transfer of the product in the mold, which can greatly improve the production efficiency of the product, reduce the production cost of the product, save the material cost, and have stable quality. reliable.
Classification by product processing method
According to the different processing methods of products, dies can be divided into five categories: punching and shearing dies, bending dies, drawing dies, forming dies and compression dies.
a. Punching and shearing dies: The work is done by shearing. The commonly used forms are shearing dies, blanking dies, punching dies, trimming dies, edge-forming dies, punching dies and punching dies.
b. Bending mold: It is a shape that bends the flat blank into an angle. Depending on the shape, precision and production volume of the parts, there are many different forms of molds, such as ordinary bending dies, cam bending dies, curling dies Dies, arc bending dies, bending punching dies and twisting dies, etc.
c. Drawing mold: Drawing mold is to make flat blank into seamless container with bottom.
d. Forming die: refers to the use of various local deformation methods to change the shape of the blank, in the form of a convex forming die, a curl forming die, a neck forming die, a hole flange forming die, and a round edge forming die.
e. Compression die: It uses strong pressure to make the metal blank flow and deform into the desired shape. Its types include extrusion die, embossing die, embossing die, and end pressing die.