China's existing die-casting and die-casting related businesses with about more than 12,600, of which die-casting production enterprises account for about 70%. About 30% of the enterprises such as alloy, die-casting machine, mold, melting equipment, paint, testing equipment, all kinds of raw materials, peripheral equipment and die-casting machine spare parts and so on, the output of domestic die-castings has already ranked first in the world and the GDP has reached 50 One trillion yuan.

In all kinds of ownership of enterprises, the large-scale die-casting with an annual output of 10,000 tons, with an annual output of 60,000 tons, medium-sized die-casting can be an annual output of 5,000 tons, the small-scale die-casting also have hundreds of tons . The proportion of various die castings in the total amount of die casting, aluminum accounted for about 83%, 15% of zinc alloy, left accounted for 2%, of which aluminum alloy die casting production in 2014 about 5.6 million tons.

The main output of die-casting products are mainly automobile and motorcycle parts. Die-castings used on each automobile are gear box, cylinder block and quasi-die-castings of crankcase with an average of 75kg die castings per vehicle. The total weight Accounting for more than 50% of the domestic production of die-casting parts.

Die-casting manufacturing requirements of very high precision, including grinding, cutting, welding and other processes.

In CNC, multi-axis and three-axis CNC machine tools for processing production, the design of such high-precision machine tool cylinder and a series of high-precision pneumatic actuators. Affected by the traditional process, most of the castings produced by the manufacturer often defective products, processing accuracy is difficult to meet the requirements, and such problems have not been effectively resolved. Many companies confused: Why the same imported machine tools, processing precision in the domestic production is far different from abroad?

Through the search for reasons, we found that the timeliness and accuracy of a series of pneumatic components such as air cylinders in CNC machine tools are crucial to the machining accuracy. However, the operation of pneumatic components is closely related to the quality of the air supply. However, most of the existing die-casting plant in the configuration of the air compressor system, still using the most traditional drying method that is after the cold dryer for cooling and drying, after cooling and drying compressed air pressure dew point is generally +10 ℃ ~ +15 ℃ (Higher than the mechanical industry standard JB / T5967-2007 six levels);

The pneumatic components used on high-precision CNC machine tools clearly require a pressure dew point of +3 ℃ (in line with the mechanical industry standard JB / T5967-2007 four-level requirements) below, the moisture content of compressed air seriously exceeds the equipment requirements.

After finding out the reason, the post-processing equipment was rectified immediately. The original dryer was replaced by a mold-core adsorption dryer, and the pressure dew point after replacement could reach -20 ° C, fully satisfying the production demand. A month later, statistics and analysis of the precision of finished products and processed products showed that the quality of defective products wa