Investment casting technology for transmission housing

A transmission housing and investment casting technology, which is applied in the field of mechanical processing, can solve the problems of complex production process, long production cycle, and high growth cost, and achieve the effects of good toughness, improved surface smoothness, and improved structural compactness

Inactive Publication Date: 2017-12-19
HEFEI CITY TENVER PRECISION CASTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the existing problems: casting characteristics, investment casting has high precision, smooth surface, and good replicatio

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] Example 1:

[0022] An investment casting process for a transmission housing, comprising the following aspects:

[0023] (1) Waxing: first immerse the mold in absolute ethanol for cleaning treatment, which can remove impurities such as particles and dust in the mold, improve the filling and surface smoothness of the wax, and heat the mixed wax material for homogenization treatment. Wax was poured into the mold at a pressure of 174kPa, then treated at 76°C and a pressure of 0.23MPa for 36min, and ultrasonically oscillated for 16min at the same time, then treated at 52°C and a pressure of 0.42MPa for 1.5h, and ultrasonically oscillated for 26min at the same time. It can promote the precipitation of air bubbles in the wax, and then through the method of cooling and pressing, the wax will slowly condense, and the high pressure will increase the filling degree of the condensed wax in the mold, improve the compactness of the wax structure after solidification, and make a wax ...

Example Embodiment

[0037] Example 2:

[0038] (1) Waxing: first immerse the mold in absolute ethanol for cleaning treatment, which can remove impurities such as particles and dust in the mold, improve the filling and surface smoothness of the wax, and heat the mixed wax material for homogenization treatment. Wax was poured into the mold under the pressure of 177kPa, then treated at 78°C and 0.28MPa for 39 minutes, and ultrasonically oscillated for 19 minutes at the same time, then treated at 53°C and 0.48MPa for 2 hours, and ultrasonically oscillated for 29 minutes at the same time. Promote the precipitation of air bubbles in the wax, and then slowly condense the wax by cooling and pressurizing, high pressure increases the filling degree of the condensed wax in the mold, improves the compactness of the wax structure after solidification, and makes a wax mold after cooling;

[0039] (2) Model shell production: Coat the inner layer with a thickness of 1-2 mm to the wax model. The inner layer coati...

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PUM

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Abstract

The invention discloses an investment casting technology for a transmission housing. The investment casting technology comprises the following steps that (1) wax pouring is conducted, specifically, a mixed wax material is homogenized and then processed at the temperature of 75-80 DEG C and the temperature of 50-54 DEG C; (2) a mold housing is manufactured, specifically, four inner mold material layers and two outer mold material layers are smeared on the surface of a wax mold and subjected to drying treatment; (3) dewaxing is conducted, specifically, the dried mold housing is subjected to dewaxing at the temperature of 76-80 DEG C and washed with gasoline; (4) roasting is conducted, specifically, the dried mold housing is roasted at the temperature of 450-500 DEG C and the temperature of 800-850 DEG C; (5) pouring is conducted, specifically, molten iron is subjected to still standing treatment at the temperature of 900-930 DEG C after pouring and subjected to vacuum cooling; and (6) polishing and inspection are conducted, specifically, the transmission housing subjected to precision casting is polished, and the inspection precision and internal damage are inspected. The transmission housing produced through the investment casting technology has the characteristics of being high in percent of pass, tensile strength and percentage reduction of area, and is good in abrasion resistance and high temperature resistance.

Description

technical field [0001] The invention belongs to the technical field of mechanical processing, and in particular relates to an investment casting process for a transmission housing. Background technique [0002] Investment casting, also known as lost-wax casting or lost-wax casting, is characterized by the ability to produce sophisticated metal parts or exquisite handicrafts that are close to the final shape of the product and can be used directly without or with little processing. Near, clean and shaped metal liquid forming process; due to its excellent processing characteristics, it is widely used in the field of precision manufacturing, such as engine blades, nozzles, impellers and other components. The processed parts have high precision, smooth surface, and good reproduction processing performance ; The disadvantage of the investment casting method is that the production process is complicated, the energy consumption is large, the growth cost is high, and the production ...

Claims

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Application Information

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IPC IPC(8): B22C9/04B22C7/02B22C9/22B22C9/12
CPCB22C9/04B22C7/02B22C9/12B22C9/22
Inventor 孙爱琴
Owner HEFEI CITY TENVER PRECISION CASTING
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