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Process of utilizing afterheat of casting in reducing stress ageing treatment

A technology of aging treatment and residual stress, applied in heat treatment equipment, heat treatment process control, manufacturing tools, etc., can solve problems such as increased tool wear, difficult processing, and cracking of cast iron parts

Active Publication Date: 2007-08-22
GUANGXI YUCHAI MASCH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0018] (3) Influence and harm of casting residual stress on iron castings
[0023] 2. Lead to cracking of cast iron parts
[0029] 3. Increase the difficulty of machining and increase the wear of the tool
But the electric furnace is easy to control, with high degree of automation and less pollution
[0063] 3. For the case where there is a large residual stress value in the casting, it is not suitable to adopt vibration aging treatment

Method used

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  • Process of utilizing afterheat of casting in reducing stress ageing treatment
  • Process of utilizing afterheat of casting in reducing stress ageing treatment
  • Process of utilizing afterheat of casting in reducing stress ageing treatment

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Embodiment Construction

[0080]Castings are unpacked at 300-800°C, pushed to the vibrating shakeout machine, the manipulator removes the pouring riser, removes most of the molding sand and core sand, puts the castings into the continuous annealing furnace, and continuously heats up to 450-650°C in the heating section After heat preservation for 1 to 8 hours, slowly cool in the cooling section to below 200°C, take out the furnace and air cool to room temperature. After testing, the casting residual stress of the casting is less than 60MPa, and the energy consumption per ton is about 1 / 4 of that of the commonly used traditional stress-reducing treatment process, which saves energy, reduces production costs and improves production efficiency. Use the manipulator to pick up or put down the casting, clean the sand, and remove the riser. The action program of the manipulator is designed according to the purpose, and the corresponding mechanical parts and electronic circuit boards are configured according to...

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Abstract

The present invention discloses ageing treatment process of utilizing afterheat of casting in reducing the residual stress of casting. The ageing treatment process includes the following steps: knocking out the casting at 300-800 deg.c and eliminating runner, riser head, sand core and mold sand; loading into continuous heat treatment furnace at 300-600 deg.c; heating to 450-650 deg.c at the temperature raising speed of 80 deg.c / hr and maintaining for 1-8 hr, cooling slowly in the temperature decreasing speed lower than 30 deg.c / hr to 200 deg.c; and cooling to room temperature outside the furnace. The process can reduce the residual stress of casting to below 60 MPa and reach the requirement on casting for diesel engine. The present invention has saving in energy source, time and cost.

Description

technical field [0001] The invention relates to a ferrous metal stress-reducing process, in particular to a casting residual heat stress-reducing aging treatment process and method for castings produced by a continuous mechanized casting production line. Background technique [0002] Commonly used traditional processes for stress-relief aging heat treatment of castings are: [0003] Open the box → cool down to room temperature, remove the riser and molding sand, sand core, polish and remove the top → stress-reducing aging heat treatment. [0004] Stress-relief aging heat treatment is aimed at reducing casting residual stresses in castings. The principle is to reheat the casting to 530-620°C, use plastic deformation to reduce the residual stress, and then slowly cool it in the furnace to obtain a casting with a smaller residual stress than the original one. This is the most commonly used heat treatment for gray iron castings. See attached figure 1. [0005] In the case of ...

Claims

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Application Information

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IPC IPC(8): C21D11/00B22D30/00
Inventor 童思艺
Owner GUANGXI YUCHAI MASCH CO LTD
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