Advanced Manufacturing Technology for Home Appliance Mold Design

Home appliance products are becoming larger and larger. The one mold with multiple cavities aiming to improve production efficiency has also led to the increasing size of home appliance molds. At the same time, the rapid development of home appliance electronics has also brought about the miniaturization and precision of parts. The machining accuracy tolerance of some molds is required to be less than 1μm.

Therefore, only by actively adopting advanced equipment and improving the level of mold manufacturing can significant economic benefits be achieved.

Ⅰ. High-speed cutting technology of home appliance mold design

High-speed cutting processing, generally used for large household appliances cover molds, the surface processing accuracy can reach 0.01mm. The mold surface after high-speed milling and finishing can be used with only a little polishing, which saves a lot of time for grinding and polishing. High-speed cutting processing greatly shortens the mold-making cycle, thereby improving the market competitiveness of products.

European and American mold companies use CNC high-speed milling, most of which are five-axis linkage, and the spindle speed is generally 15000-30000r/min. In addition, European and American home appliance mold companies also attach great importance to equipment renewal, and the depreciation period of equipment is generally 4-5 years. Adding CNC high-speed milling machines is one of the key points of equipment investment for mold design companies.

Ⅱ. High-speed scanner and home appliance mould design and manufacturing scanning system

It provides many functions from scanning the model or physical object to processing the desired model, which greatly shortens the development and manufacturing cycle of mold design and manufacturing.

Some fast scanning systems can be quickly installed on existing CNC milling machine-type machining centers to realize fast data collection, automatically generate various CNC precision machining service, and different formats of CAD data for reverse engineering of mold manufacturing.

The mold scanning system has been successfully applied in the European and American home appliances and other industries.

Ⅲ. Improvement of hot runner and gas-assisted appliance mold design and manufacturing

More than 80% of the plastic molds produced by many plastic injection molding companies in China use hot runner technology, and the effect is very obvious.

Many companies in Europe and the United States have been able to successfully use gas-assisted technology in the molds of TV housings, washing machine housings, and some thick-walled plastic parts. Gas-assisted injection molding has the advantages of low injection pressure, small product warpage, good surface quality, and easy molding of products with large wall thicknesses. It can greatly reduce costs while ensuring product quality.

Ⅳ. Combination of rapid prototyping technology and rapid molding technology for home appliance mold design

Competition in the home appliance market is becoming increasingly fierce, and product upgrading is accelerating. The rapid prototyping technology and rapid tooling technology are combined in mold manufacturing, that is, using rapid prototyping technology to create prototypes of product parts, and then quickly manufacturing molds based on the prototypes.

The application of RP and RT technology from mold design to completion requires only about 1/3 and 1/4 of the traditional processing method and cost. Many home appliance mold design companies in Europe and the United States use rapid prototyping to cast silicone rubber molds for a small amount of refurbished plastic parts, which are very suitable for product trial production. Some countries in Europe and the United States also use aluminum to make injection molds, which can shorten the injection cycle by 25-30%, greatly reduce the weight of home appliance molds, and cut the grinding and polishing time by half. Germany has developed a kind of reinforced plastic, which is used to make the cavities and cores of plastic molds, with a life span of more than 100,000 pieces.

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