Design of die casting die for micromotor rotor
Release time:2022-02-26 

1. The micromotor rotor part shown in the mold structure design is made of industrial pure aluminum and is formed by die casting on the vertical die casting machine with the mold shown. The moving and fixed dies of the die adopt the structure of insert block and insert sleeve, which not only saves the die steel, but also improves the exhaust performance of the die and improves the quality of the product. The first mock exam has six cavity mold structure to improve production efficiency and equipment utilization rate according to the smaller size of the casting.

The gating system of die casting die determines the flow path and state of liquid metal filling, which plays an important role in reducing pores and impurities and obtaining dense structure. Therefore, the choice of gating system form is very important. In order to make the liquid metal flow shortest and the die structure compact, the central gate pouring form is adopted. The process has the advantages of short process, uniform pressure transmission, synchronous filling sequence, uniform temperature field distribution, smooth exhaust and convenient slag discharge. It can avoid the eccentric pressure of the medium cavity on the die in the die-casting process and ensure the quality of the die-casting parts.

Different from ordinary die castings, the structure of micromotor rotor seems simple, but the wall thickness varies greatly. The wall thickness of end ring, wind blade and guide strip are thin and thin. If the die design is unreasonable, it will lead to quality problems such as shrinkage, porosity, air hole, insufficient forming of guide strip and air blade.

The two ends of the iron core of the rotor parts shown have one end ring with the length of 12mm and 6mm respectively. The 6mm end ring is the first in the design: Tian Fuxiang, male, born in 1951, professor.

To feed the gate end, place a 12mm end ring at the bottom of the cavity.

During die casting, liquid aluminum first fills the top of the cavity. Therefore, the bottom of the cavity is required to have a good exhaust capacity, otherwise the casting will have defects such as pores and insufficient filling due to insufficient exhaust. Therefore, an exhaust duct with a width of 18mm and a depth of 0.1mm is set at the bottom of the mold cavity shown. At the same time, the method of adding insert block and insert sleeve in the moving and fixed mold is adopted to make the gas in the die-casting process more conducive to discharge, so as to solve the problem of casting porosity, reduce the waste products caused by porosity and improve the qualified rate of die-casting. The vulnerable parts on the die cavity are designed as the insert block and insert sleeve structure shown in the figure, which can save the die steel, and the insert block and insert sleeve are easy to manufacture. By replacing the insert block and insert sleeve, the renewal cost of the die is reduced.

Research on CAD head-on method of die casting die based on Pro / Engineer Xiao Qian, Zhou Xinjian, Zhou Huilan, Zhang slowly (East China Jiaotong University, Nanchang, Jiangxi 330013) is a new method.

Die casting process and die CAD system can shorten the design cycle, reduce the cost and improve the competitiveness of products, so it has been widely valued at home and abroad. At present, there are mainly two kinds of system development methods. One is based on general mechanical CAD / CAM software, such as UG and Pro / Engineei in the United States; The other is to write the CAD core program according to the visual programming language in Windows environment, and the components other than the core program are developed by other professional software. Pro / E is a three-dimensional CAD / CAM software developed by American Parameter Technology Corporation (PTC). It integrates the CAD / CAM integration functions of part design, product assembly, mold development, NC machining, sheet metal design, casting design and modeling design. It puts forward that the die-casting mold realizes the integration of CAD design, reverse engineering, automatic measurement, mechanism simulation, stress analysis and product data management. Aiming at these functional modules of Pro / E, a new method of die casting die CAD based on Pro / E is proposed.

1 design principle and content of die casting die casting die is an important process equipment for die casting production. The quality of die casting die design directly affects the shape, size, strength and surface quality of die castings. Therefore, the design of die casting die should meet the following principles: adapt to various process requirements of die casting production and obtain die castings that meet the requirements of drawings.

Attach great importance to the design and calculation of gating system and minimize the consumption of gating alloy for die castings.

Standardized components shall be used as far as possible to shorten the design and manufacture. The production practice shows that the exhaust effect of the die and the die casting quality are good. The casting is tested by X-ray machine, the metal structure of the guide strip and end ring is relatively dense, without pores, and the surface appearance is smooth, without cold insulation and other defects.

2 working principle of the die when the die is in the fully open position, place the stacked rotor core in the cavity. During die casting, the aluminum liquid in the material cylinder is pushed by the punch of the die casting machine, passes through the transverse sprue from the sprue, and is injected into the mold cavity under high pressure at the inner gate. After the mold is left for 12s, the mold is opened. Under the action of the push rod of the die casting machine, the workpiece is pushed out by the top plate 21 through the ejector rods 3 and 4. During mold closing, the top plate is reset by the reset lever 23.

3 process parameters die casting process parameters include injection specific pressure, filling speed, die casting temperature, cavity temperature, die retention time, etc.

The specific pressure has a great influence on the ability of liquid metal to fill the cavity, the strength and compactness of the casting. High specific pressure can improve the strength and compactness of castings, but too high specific pressure will reduce the service life of die casting die, increase the tendency of die sticking, and significantly reduce the elongation of castings. The specific pressure of this process is set at 52Mpa, and the filling speed is an important factor affecting the appearance quality of castings. The flow rate of molten metal at the inner gate is set within 20m / s. * C.

In die casting production, keeping the die temperature constant can improve the casting quality, production efficiency and die service life. The mold temperature control range is 200 ~ 250.0 The mold retention time is about 3S per mm of the average wall thickness of the casting The mold retention time of rotor should be correctly selected according to the rotor model. Too short mold retention time will affect the die-casting quality of rotor, and too long will affect the production efficiency. The mold retention time of the casting is 12s Conclusion the production practice shows that the die casting die has reasonable structure, reliable exhaust, flexible and convenient operation, no heating during the use of rotor chip, long service life of mandrel, good casting quality and high production efficiency.

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