The main process of forming household appliances

The molding and processing methods of plastic products for household appliances mainly include injection molding, extrusion molding, thermoforming, hollow molding, lamination molding, compression molding, transfer molding, foam molding, casting molding, insert casting, encapsulation, etc. Mainly injection molding.

1. Precision injection molding

High precision and repeatability in terms of size and weight can be guaranteed. Injection molding machines using this technology can achieve high-pressure, high-speed injection. Since its control method is usually open-loop or closed-loop control, it can achieve high-speed control of the desired process parameters. Usually, precision honey injection molding requires higher precision for Moxian. At present, China has been able to produce small and medium-sized precision injection molding machines.

2. Rapid prototyping technology

It has developed rapidly with the diversified development of household appliances and continuous upgrading, and is mainly used to prepare plastic casings for household appliances. The advantage of this technology is that small batches of plastic parts can be produced without the need for molds. At present, the more mature rapid prototyping methods include laser scanning molding and liquid photocuring molding, among which the laser scanning molding method is widely used. Laser scanning equipment is composed of laser light source, scanning device, dusting device and computer. The processing process is that the laser head controlled by the computer scans according to a certain trajectory. At the position where the laser passes, the plastic micropowder is heated and melted and bonded together. After each scan, the micropowder device sprinkles a thin layer of powder, so that, After repeated scanning, a product with a certain shape and size is formed.

3. Melt core injection molding technology

It is usually used to form special-shaped cavity products that require high cavity roughness and precision and cannot be processed by hollow molding or rotational molding methods. At present, the application of this technology in foreign countries is relatively mature, but it is still in a state of individual application in China. The processing principle of this technology is to form a core that forms a cavity first, and then use the core as an insert for injection molding.

4. Gas-assisted/water-assisted injection molding

It has a wide range of uses and can form various types of injection molded parts, and its typical product is a TV casing. During injection molding, gas or superheated water can be injected into the cavity almost simultaneously with the plastic melt.

5. Electromagnetic dynamic injection molding technology

This technology makes the screw vibrate back and forth in the axial direction through the action of electromagnetic force. Because the plastic is microplasticized in the pre-plasticizing stage, the structure of the plastic part in the pressure-holding stage is more compact, and the internal stress of the product is reduced.

6. Laminated injection molding technology

When using this technology, a special printed decorative plastic film needs to be clamped in the mold before injection molding, and then injection molded. The printed film can be attached to the surface of the plastic part after being deformed by heat, which is not only beautiful and firm, but also saves the post-decoration step.