【正文】 cess when the best time to change a condition to observe a few times, pressure, temperature, time, all with the tone, it could easily lead to confusion and misunderstanding, a problem do not know what reason. Measures to adjust the process, means, in many ways. Example: solving products Note dissatisfaction there is more than a dozen possible solutions to choose to address the crux of the problem, two major programs, in order to really solve the problem. In addition, attention should be paid to the dialectical relationship between the solution. Such as: products the depression, sometimes to raise he melt temperature, sometimes to reduce the melt temperature。Injection molding machine hydraulic system Injection molding machine Injection molding machine The injection molding machine is a kind of plastic machinery referred to as theinjection molding machine or injection molding machine thermoplastic or thermosetting material the use of plastic mold into various shapes of plastics molding equipment. Injection molding by the injection molding machine and plastic casts shaper is one kind of heating up the plastic the plasticizing, pours into with the aid of the advancement anization the melting plastic in the mold cavity, after cooling, the stereotypia forms the product the plastic to take shape the processing equipment. It can dispose the different mold, but time takes shape the contour plex product, is in the plastic machinery one of main aircraft types. The plastic injection takes shape already has very many forms. The hydraulic pressure type plastic injection shaper is one of them, it mainly has gathers the mold anization, injects the part, the hydraulic transmission and the plastic casts shaper is one kind of heating up the plastic the plasticizing, pours into with the aid of the advancement anization the melting plastic in the mold cavity, after cooling, the stereotypia forms the product the plastic to take shape the processing equipment. It can dispose the different mold, but time takes shape the contour plex product, is in the plastic machinery one of main aircraft types. The plastic injection takes shape already has very many forms. The hydraulic pressure type plastic injection shaper is one of them, it mainly has gathers the mold anization, injects the part, the hydraulic transmission and the electricity control system and so on several parts of positions, but the hydraulic pump, the hydraulic cylinder, each kind of hydraulic valve, the electrical machinery, the electrical part as well as the control measuring appliance are indispensable control part. Three major ponents of (1) clamping ponents. It is a molded member installation Die. Mainly by fixed templates, dynamic templates clamping mechanism, clamping hydraulic cylinder, ejector device. (2) injection member. It is a plastics injection molding machine member. Mainly by the feeding device and barrel, screw, nozzle, top plastic device, the injection of hydraulic cylinders, injection seat and its mobile hydraulic cylinders and other ponents. (3) hydraulic transmission and electrical control systems installed in the fuselage on the inside and outside the chamber, is the driving force of the injection molding machine and manipulating the control unit. Mainly posed of hydraulic pumps, hydraulic valves, motors, electrical ponents, and control instruments. SZ250A type plastic injection molding machine are small injection molding machine. Each maximum injection capacity of 250 g. Basis for the plastic injection molding process, injection molding machine hydraulic drive system should meet the following requirements: (1) the mold clamping hydraulic cylinder having a sufficiently large clamping force, and its operating speed can be based on the requirements of the the clamping and Kai mold process varies. In the injection process, the molten plastic is often injected into the cavity to a high voltage of 4 ~ 15 MPa. Thus, the requirements of the mold clamping mechanism ha