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In the process of casting process design, there are many cumbersome mathematical calculations and a large number of table selection and other work. Only by the personal experience and manual operation of the process designer, not only does it take a lot of time, but the design results often vary from person to person. It is difficult to guarantee the quality of castings. Since the 1960s, especially after the 1980s, with the rapid development of electronic computer technology, computer-aided design technology has been more and more widely used in the industry, and it is also scientific and precise for casting process design. It provides a good tool and becomes one of the important contents of the development and production of casting technology.
The typical casting process CAD system working process is:
1) Receiving the casting drawings sent by the user, and performing 3D modeling on their own when receiving the drawings;
2) Process analysis and quotation; observe any structure of the casting from any angle or as needed, calculate the weight of the casting and the modulus of different parts according to the three-dimensional entity, calculate the process data such as the riser, and carry out the preliminary design and estimation of the casting. Cost and make a quote.
3) Carry out the detailed design of the casting; extract the data from the established three-dimensional solids of the casting to simulate the three-dimensional solidification and modify the casting design, and then automatically generate the corresponding mold, core box or mold drawing.
4) The mold, core box and mold are formed by CNC machining, casting and inspection, collecting data in production for quality tracking and knowing the future casting design. At present, the software functions of the casting process CAD are generally single, and are divided into relatively independent systems such as casting design, solidification simulation and pattern processing.
2 Characteristics of casting process CAD
First, the part drawing is input into the computer through a digitizer or other graphic input device, and then the position of the casting position and the parting surface are marked as required, and the machining allowance and the symbol of the non-casting hole and the groove, and the mode inclination are further drawn. And mark the size to form the casting drawing; based on this, the casting modulus and weight calculation, the feeding system and the pouring system design; the design calculation results are graphically added to the casting drawing, and then the sand core is drawn Shape, calculate the core clearance, core compression ring, anti-pressure ring, sand trap and core block line and size, etc., to form a complete process diagram; finally draw the casting process card. The graphics are output by the plotter, completely replacing the cumbersome process of manually drawing the process drawing, drawing, and drawing, and the modification and archiving are convenient, which greatly improves the design efficiency.
Compared with the traditional casting process design method, the computer designed casting process has the following characteristics:
1) The calculation is accurate, rapid, and eliminates artificial calculation errors.
2) Process design and comparison can be carried out on several different schemes at the same time to find a better solution.
1 casting process CAD