Shown is a more typical valve control process: step, at the beginning of injection molding, open the gate (gate 2) in the middle of the mold and the melt is divided to both sides. In the second step, when the split melt just flows through the gates on both sides, close the middle gate (gate 2) and open the gates on both sides (gates 1, 3) at the same time. The third step, when the melt fills the mold Open all gates when filling/holding pressure begins. The fourth step is to close all gates before the end of the holding pressure. 2.2 Features of the program control valve 2.2.1 Weld marks Because of the use of the gate of the control valve, the melt in the mold enters the different positions of the mold cavity in sequence, so it can be seen from the first step that the gate 2 and the pouring

3.2 Effect of vacuum heat treatment of molds Beijing: Machinery Industry Press, 1994.475-495. Wang Dewen's new compilation of 300 practical mold techniques Beijing: Science Press, 1996.251-262. Mold materials and service life of the editorial board of the mold practical technology series.　　 Beijing: Machinery Industry Press, 2000.16-17. The brake valve directly saved more than 300,000 yuan in cost. With this program, about 750,000 yuan, not only achieved good economic benefits, but also accumulated experience for the maintenance and testing of about 50 dual-way brake valves each year, which can save the maintenance of large-scale complete sets of equipment each year.

Control system, thermal compensation system, etc., under conditions, can use 5-axis machining center to process complex cavities, reducing processing paths, etc. ⑵Furthermore, you can use OMAT technology (the speed is automatically adjusted according to the amount of cutting to ensure that the machine tool is always running at full load) and the adaptive control technology in the CNC system (automatically adjust the cutting parameters according to the information collected during the processing, Achieve excellent control).　　 2 Machining example 3; Material: 3 Outlook With the development of new drive and control technology, higher speed and larger feed rate machine tools become possible. The emergence of the new three-dimensional design machine, the application of laser processing technology to hard material molds, and the application of supersonic processing to hard and brittle material processing, will strongly promote the development of high-speed cutting processing.

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