Casting method capable of preventing deformation of complex motor case

A casing and complex technology, applied in the direction of casting molding equipment, casting molds, casting mold components, etc., to achieve the effects of avoiding excessive gas generation, improving smoothness, and avoiding local shrinkage problems

Inactive Publication Date: 2017-12-15
安徽省含山县潮林铸管厂(普通合伙)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a casting method to ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A casting method for preventing deformation of a complex motor casing, comprising the following steps:

[0017] (1) Heat the motor casing material in a high-temperature nitrogen protective atmosphere at a temperature of 1400-1600°C to obtain a melt, and add 1.8% chromium carbide, 0.4% zinc nitride, and 0.06% sulfur equivalent to the melt weight powder, after stirring and reacting for 15-20 minutes, keep warm for later use, the particle size of chromium carbide and zinc nitride should not exceed 80nm;

[0018] (2) Cast the molten liquid after the above treatment into the sand mold, keep it at 455°C for 5 hours after release, then keep it at 230°C for 13 hours, then raise the temperature to 800°C and keep it at 2.5 Hour;

[0019] (3) Cool the castings obtained above to 500°C at a cooling rate of 22°C / min, then use air cooling to cool down to room temperature at a cooling rate of 58°C, and then grind and polish.

[0020] Among them, the method of making the sand mold is:...

Embodiment 2

[0023] A casting method for preventing deformation of a complex motor casing, comprising the following steps:

[0024] (1) Heat the motor casing material in a high-temperature nitrogen protective atmosphere at a temperature of 1400°C to obtain a melt, and add 2.2% chromium carbide, 0.2% zinc nitride, and 0.08% sulfur powder equivalent to the weight of the melt, After stirring and reacting for 20 minutes, keep warm for standby, the particle size of chromium carbide and zinc nitride is not more than 80nm;

[0025] (2) Cast the molten liquid after the above treatment into the sand mold, keep the temperature at 450°C for 6 hours after the mold is released, then keep it at 220°C for 14 hours, then raise the temperature to 780°C, and keep it for 3 hours Hour;

[0026] (3) Cool the casting obtained above to 500°C at a cooling rate of 25°C / min, then use air cooling to cool down to room temperature at a cooling rate of 60°C, and then grind and polish.

[0027] The casting method in t...

Embodiment 3

[0029] A casting method for preventing deformation of a complex motor casing, comprising the following steps:

[0030] (1) Heat the motor casing material in a high-temperature nitrogen protective atmosphere at a temperature of 1600°C to obtain a melt, and add 1.4% chromium carbide, 0.6% zinc nitride, and 0.04% sulfur powder equivalent to the weight of the melt, After stirring and reacting for 15 minutes, keep warm for standby, the particle size of chromium carbide and zinc nitride should not exceed 80nm;

[0031] (2) Cast the molten liquid after the above treatment into the sand mold, keep the temperature at 460°C for 4 hours after releasing the mold, then keep it at 240°C for 12 hours, and then raise the temperature to 780-820°C, keep warm for 2 hours;

[0032] (3) Cool the casting obtained above to 500°C at a cooling rate of 20°C / min, then use air cooling to cool down to room temperature at a cooling rate of 55°C, and then grind and polish.

[0033] The casting method in t...

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Abstract

The invention belongs to the technical field of complex motor cases, in particular to a casting method capable of preventing deformation of a complex motor case. The casting method capable of preventing deformation of the complex motor case comprises processes of melt processing, re-casting and step-by-step cooling of motor case materials. Compared with the prior art, the casting method capable of preventing deformation of the complex motor case has the following advantages that chromium carbide, zinc nitride and sulfur powder are added in the high temperature nitrogen protection atmosphere so that air entrapment can be avoided during melt casting, and excessive gas volume is avoided, the sand-type curing time can be prolonged, sand dropping or sand crushing in the casting process is avoided, and after columnar mold stripping, cooling is conducted first, then heating is conducted, the cooling speed is controlled, so that the problem of local shrinkage of the complex motor case can be avoided, the finish degree of the surface of a formed part is improved, and defects of blowholes, slag holes and sand holes are prevented; the product yield reaches 97%, wherein the problems of blowholes, sand holes and shrinkage accounts for about 25% of the scrap rate, and deformation of the complex motor case can be reduced effectively.

Description

technical field [0001] The invention belongs to the technical field of complex motor casings, and in particular relates to a casting method for preventing deformation of complex motor casings. Background technique [0002] The casings of ordinary motors and explosion-proof motors are made of pig iron castings, and then finished by a lathe to match the stator core. Foreign electric locomotive motor casings have complex structures, high internal quality requirements, and difficult casting. Large, there are usually process problems such as difficult feeding of castings, more surface cracks, and serious casting deformation, which restricts product development. Some of the motor casing castings have complex inner cavities, more local protrusions, and external straps of castings. Many castings are more difficult to feed. For vertical pouring or vertical casting, the riser is set at the upper end, but the wall of the casting is thicker, the upper part is thicker and the lower part ...

Claims

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Application Information

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IPC IPC(8): B22C9/02B22C9/22
CPCB22C9/02B22C9/22
Inventor 张益涛
Owner 安徽省含山县潮林铸管厂(普通合伙)
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