Working principle of injection molding machine

- May 24, 2019-

Plastic injection molding technology was developed from the end of the 19th century to the beginning of the 20th century according to the principle of die casting. It is one of the most commonly used methods in plastic processing. This method applies to all thermoplastics and some thermoset plastics (about 1/3 of the total amount of plastics).

1.1 Working principle of injection molding machine

The precision injection molding machine works similarly to the syringe for injection. It uses the thrust of the screw (or plunger) to inject the plasticized molten state (ie, the viscous flow) into the closed cavity. The process of obtaining the product after curing and setting.

Injection molding is a cyclic process, and each cycle mainly includes: quantitative feeding - melt plasticizing - pressure injection - filling mold cooling - mold extraction. After removing the plastic part, the mold is closed again for the next cycle.

1.2 Structure of precision injection molding machine

The precision injection molding machine is divided into a plunger type injection molding machine and a screw type injection molding machine according to the plasticizing method; according to the transmission mode of the machine, it can be divided into hydraulic type, mechanical type and hydraulic-mechanical (linkage type); Automatic, semi-automatic, manual injection molding machine.

How to choose injection molding machine, servo injection molding machine factory has a coup

The injection molding machine market is growing day by day. In the end, how to choose a variety of injection molding machines, in order to avoid being "slaughtered" by others, and to buy a cost-effective injection molding machine, follow the small series to look down.

1. Collect application materials

Component Size and Oriented Material Specifications

2, determine the required clamping force

Check component height, wall thickness, material, core and projection surface to determine the required clamping force

3. Verify the space of the selected clamping device

Verify mold size: horizontal, vertical and closed height correspond to the selected clamping device: if necessary, increase the clamping mode selection

4. Estimated cycle time

Depending on the wall thickness, process, gate thickness, ribs and flanges, the approximate filling, packing and cooling time are determined. Depending on the height of the part (clamping stroke), the core, the spool action and the discharge of any necessary parts, the approximate Mode-locking traverse time and component effluent. This will help determine the operating specifications of the machine you need.