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Die-casting method of induction motor copper cage rotor and die casting device thereof

A squirrel-cage rotor and induction technology, applied in the directions of rotors, transmission devices, stators, etc., can solve the problems of poor casting flow, generation of air bubbles, affecting the working performance of motors, etc., to achieve the effect of reasonable process and device, and reduce production costs.

Active Publication Date: 2009-06-03
云南铜业压铸科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the melting process, when the temperature exceeds 1200°C, a large amount of oxidation will occur. The more oxidation, the poorer the casting flow, and it is easy to generate air bubbles in the casting process, and produce pores in the casting, which will affect the working performance of the motor.

Method used

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  • Die-casting method of induction motor copper cage rotor and die casting device thereof
  • Die-casting method of induction motor copper cage rotor and die casting device thereof
  • Die-casting method of induction motor copper cage rotor and die casting device thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Example 1: Die-cast 10HP copper rotor

[0048] The die-casting method and die-casting device are as described in the Summary of the Invention and shown in the accompanying drawings.

[0049] The die casting process is:

[0050] 1. Preheating process

[0051] a. The die-casting mold uses a heating mold frame to preheat the mold, and the preheating temperature is controlled at 350-650°C;

[0052] b. The pressure chamber is preheated by concentrating on the lower half of the heating chamber, and the preheating temperature is controlled at 350-650°C;

[0053] c. Laminate the silicon steel sheet and heat it with an intermediate frequency furnace. The preheating temperature is kept at 350-500°C, and put it into the preheated mold cavity;

[0054] 2. Copper smelting

[0055] a. Copper material pretreatment: copper material is pure copper with a copper content greater than 99.995%. 6.4kg of pure copper raw material is processed into a copper rod with a length of 4cm. The co...

Embodiment 2

[0063] Basically with embodiment 1. The differences are:

[0064] The heating time is 40 minutes, and the mold temperature reaches 430°C; the copper material is a high-copper alloy with a copper content of not less than 90%, and 6.4kg of high-copper alloy raw material is processed into a copper rod with a length of 5cm, and the copper rod is blasted Remove the dirt, and then put it into the cold furnace, which can be preheated and smelted with the furnace; the feeding rate of the mixed gas is 0.6L / min, and the mixed gas is N 2 with H 2 Mixed, the mixed gas contains more than 95% nitrogen; the injection speed is 1.2m / s, and the injection pressure is 51.8Mpa.

Embodiment 3

[0066] Basically with embodiment 1. The differences are:

[0067] The heating time is 60 minutes, and the mold temperature reaches 500°C; the copper material is a high-copper-containing alloy with a copper content of not less than 90%, and 6.4kg of high-copper-containing alloy raw material is processed into a copper rod with a length of 6cm; Brush the head, pressure chamber and mold cavity with a paste lubricant mixed with Wolfrakote organic and inorganic substances sold on the market to treat the punch, pressure chamber and mold cavity; the mixed gas is N 2 Mixed with CO, the mixed gas contains more than 95% nitrogen; the injection speed is 2.83m / s, and the injection pressure is 81Mpa.

[0068] The product produced by the method of the present invention has no defects such as casting cracks, poor filling, sticky mold, etc., and its vibration present value meets the R-level regulation in IEC34-14 (1996), which is higher than the N-level specified in the Y series motor technic...

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Abstract

The invention relates to a die casting method and a die casting device of a cooper cage rotor for an induction motor, which is applicable for the casting of pure copper and alloy with high copper content. The invention belongs to the technical field for smelting and rolling nonferrous metals. The die casting method comprises pretreating molds, smelting copper, casting and forming melt, and hardening and cooling. The casting device adopted by the casting method of the invention comprises a casting machine and a melting furnace, wherein, the melting furnace comprises an integrated crucible and a middle frequency induction furnace, the heating power of the middle frequency induction furnace is 0 to 100 KW; the die of the die casting machine comprises a plurality of inserts that are inserted, combined and connected. The invention has the advantages that the process and the equipment are reasonable, the product has no defect of casting cracking, surface cracking, poor filling and mold seizing, etc., the vibration value complies with R class in IEC34-14 (1996), is one class better than class N specified in the technical condition for Y series motor.

Description

Technical field: [0001] The invention relates to a die-casting method and a die-casting device for a copper squirrel-cage rotor of an induction motor, which are suitable for die-casting pure copper and high-copper-containing alloys, and belong to the technical field of nonferrous metal smelting and rolling processing. Background technique: [0002] In recent years, since the conductivity of copper is about 40% higher than that of aluminum, cast copper rotors have attracted attention. However, due to the difficulty in producing cast copper rotors, cast aluminum rotors are still widely used in electric motors. [0003] Difficulties in die-casting copper rotor technology are: the purity of the copper melt and the high casting temperature. The casting temperature of die-casting aluminum is only 700°C, and the casting temperature of copper die-casting copper is not lower than 1100°C. During the melting process, if the temperature exceeds 1200°C, a large amount of oxidation will ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D19/00B22D17/00
Inventor 黄善富徐弘王勤杨旭禹建敏付志华周胜梁栋靳芝白双建杨红梅邓陈兴
Owner 云南铜业压铸科技有限公司
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