According to relevant news reports, the output of CNC metal cutting machine tools in my country reached 123,200 units in 2010, an increase of 32% over the previous year, but most of them are economical CNC machine tools. The ratio of fixed asset investment in the die-casting industry to the increase in the output value of the die-casting industry is about 1:1 on average in the industry, and some strong-developing companies can reach 1:1.5 or even 1:2. Among the investment in fixed assets, the investment in die casting processing equipment is over 80%. Among the imported 7.07 billion US dollars and 107,700 sets of machine tools, high-end and special-purpose machine tools such as gantry machining centers, CNC milling machines, CNC horizontal lathes, CNC grinding machines, and CNC punching machines required by the die-casting industry have occupied a considerable proportion, and the number has been in recent years. Has been growing.

Due to the severe internal decomposition of domestic forging companies, the market performance of rollers, loaders, bulldozers and excavators is not ideal. Many products have a "double drop" in chain ratio and year-on-year data. Relevant experts in the industry pointed out that while the industry is in a downturn, the leading companies in the subdivided categories have grown to varying degrees. This view shows that from another level, the sales of many small and medium-sized companies have fallen more rapidly than the average. If this situation continues, it will not be long before many companies will be forced to lower prices and promote sales, and because many companies have insufficient liquidity, they will not be able to win the leading companies in the "price war" and then have to withdraw from the mall. Therefore, industry experts said that China's machinery and forging industry should be vigilant and make continuous efforts to better develop in the future.

In the production process of castings, the design of zinc alloy die-casting parts affects the production efficiency and quality of castings. The design of zinc alloy die-casting parts should pay attention to the following matters.

1. The design of die castings involves four aspects:

a, that is, the requirements of pressure casting on the shape and structure of parts; b, the technological performance of die castings; c, the dimensional accuracy and surface requirements of die castings; d, the determination of the parting surface of die castings;

The design of die-casting parts is an important part of the die-casting production technology. The following issues must be considered in the design: the selection of the mold parting surface, the opening of the gate, the choice of the pin position, the shrinkage of the casting, the dimensional accuracy of the casting, the casting The prevention of internal defects, the relevant requirements of casting holes, the relevant requirements of shrinkage and deformation, and the size of processing allowance;

Second, the design principles of die castings are:

a. Correctly select the material of the die-casting parts. b. Reasonably determine the dimensional accuracy of the die-casting parts. c. Try to make the wall thickness evenly distributed. d. Increase the process corners at each corner to avoid sharp corners.

Three, die castings can be divided into two categories according to the requirements of use:

A type of parts that bear a large load or have a relatively high speed of movement. The items to be checked are size, surface quality, chemical composition, and mechanical properties (tensile strength, elongation, hardness); the other type is other parts The items inspected are size, surface quality and chemical composition.

While paying attention to the above matters, when designing die castings, it should also be noted that the parts should meet the technological requirements of die casting. The manufacturability of die casting is considered from the position of the parting surface, the position of the push rod on the top surface, the relevant requirements of the casting hole, the relevant requirements of shrinkage and deformation, and the size of the processing allowance. Reasonable determination of the parting surface of the die-casting surface can not only simplify the structure of the die-casting mold, but also ensure the quality of the casting.