What is the injection molding machine for?

What is the injection molding machine for?

Injection molding machine is also known as injection molding machine or injection machine. It is the main molding equipment for making thermoplastics or thermosetting plastics into various shapes of plastic products using plastic molding molds. Divided into vertical, horizontal, all-electric. The injection molding machine heats the plastic, applies high pressure to the molten plastic, and makes it shoot out to fill the mold cavity. So what is the working principle of the injection molding machine? What types of injection molding machines are there? Let's learn about the relevant knowledge together with the editor.

Injection Molding Machine Brand Injection Molding Machine Knowledge Catalog What Can Injection Molding Machine Produce? Working Principle of Injection Molding Machine Types and Features of Injection Molding Machine Automotive industry: automotive lamp housings, most automotive interior parts, automotive bumpers, etc.

Electronics industry: mobile phone casing and some mechanical parts, notebook computer casing, desktop computer monitor casing, mouse, keyboard, USB, etc.

Household appliances: TV casings, washing machines, refrigerators, hair dryers, telephones, power switches, sockets, electric kettle handles and bases, etc.

Daily necessities: microwave oven lunch boxes, water cups, plastic stools, plastic tables, plastic finishing boxes, plastic flower pots, plastic dustpans, plastic bowls, plastic basins, plastic toys, water dispenser shells, clothes hangers, etc.

Cosmetics industry: some cosmetic packaging (bottles, caps), etc.

Medical industry: disposable syringes, devices for adjusting liquid volume on infusion tubes, etc.

Office supplies industry: whiteboard markers, ink pens, rulers, file holders, printer casings, copier casings, fax machine casings, etc.

The plastic things around us are made of blow molding, blister or thermoforming except for the film and the bottle body with big belly and small mouth. Most of the others are injection molded.

2 Working principle of injection molding machine The working principle of an injection molding machine is similar to that of a syringe for injection. It uses the thrust of a screw (or plunger) to inject plasticized plastic in a molten state (that is, a viscous fluid state) into a closed In the cavity of the mold, the process of obtaining the product after curing and shaping.

Injection molding is a cyclic process, and each cycle mainly includes: quantitative feeding—melt plasticization—pressure injection—mold filling and cooling—mold opening and pick-up. After taking out the plastic parts, the mold is closed again, and the next cycle is carried out.

Injection molding machine operation items: Injection molding machine operation items include three aspects: control keyboard operation, electrical control system operation and hydraulic system operation. Carry out the injection process action, feeding action, injection pressure, injection speed, selection of ejection type, temperature monitoring of each section of the barrel, adjustment of injection pressure and back pressure, etc.

The molding process of the general screw injection molding machine is: firstly, the granular or powdery plastic is added into the barrel, and the plastic is melted through the rotation of the screw and the outer wall of the barrel is heated, and then the machine is closed and the injection seat is moved forward. Make the nozzle close to the sprue of the mold, and then feed the pressure oil into the injection cylinder to push the screw forward, so that the molten material is injected into the closed mold with a lower temperature at a high pressure and at a faster speed. Keep time and pressure (also known as holding pressure), cool it, make it solidify and form, and then open the mold and take out the product (the purpose of holding pressure is to prevent the backflow of the molten material in the mold cavity, replenish materials into the mold cavity, and ensure that the product with certain density and dimensional tolerances). The basic requirements of injection molding are plasticization, injection and molding. Plasticization is the prerequisite to realize and guarantee the quality of molded products, and in order to meet the requirements of molding, injection must ensure sufficient pressure and speed. At the same time, due to the high injection pressure, a correspondingly high pressure is generated in the mold cavity (the average pressure in the mold cavity is generally between 20~45MPa), so there must be a large enough clamping force. It can be seen that the injection device and the clamping device are the key components of the injection molding machine.