Heat treating method for metal workpiece

A heat treatment method and technology for metal workpieces, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as the adverse effects of quenching time on quenching effects

Inactive Publication Date: 2005-11-16
IPUSEN INT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Since the fan is only activated when the minimum pressure is reached during filling of the vacuum furnace with cooling gas, the quenching time and the attainable quenching result are adversely affected due to the unavoidable fan start-up time

Method used

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  • Heat treating method for metal workpiece
  • Heat treating method for metal workpiece
  • Heat treating method for metal workpiece

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Embodiment Construction

[0020] Details of the objects and other advantages of the invention will be apparent from the following illustration of a method of hardfacing a metal workpiece.

[0021] The surface hardening process is used to make the interface layer of the metal workpiece have a relatively high hardness, that is, to make the entire workpiece have excellent mechanical properties. To this end, the interfacial layer is first enriched with carbon and / or nitrogen, depending on the desired performance properties, and then quenched from a suitable hardening temperature to room temperature or below. Process-acceptable surface hardening can be achieved if the carbonization or carbonitriding and subsequent quenching are carried out in a vacuum furnace which allows a simple exchange of the gaseous heat treatment medium.

[0022] After the workpiece to be treated has been, for example, carbonized in a vacuum furnace, by evacuating the gaseous carbonization medium and subsequently injecting an inert co...

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Abstract

During the heat treatment of metal workpiece and inside a vacuum furnace, electric fan in the pressure higher than the lowest pressure of the vacuum furnace is used to produce cooling air flow. The fan is driven by one multiphase motor operated in preset voltage and the lowest pressure is determined based on the motor power. In order to develop the said method for simple and economic quenching effect, the fan is started under the vacuum furnace pressure lower than the lowest pressure by relatively lower voltage until the lowest pressure is reached.

Description

technical field [0001] The invention relates to a method for the heat treatment of metal workpieces, in which a cooling air flow is generated in a vacuum furnace by means of a fan, which is activated by a multiphase The current motor is driven to determine the pressure according to the motor power of the multi-phase current motor. Background technique [0002] Vacuum furnaces are increasingly being used in the heat treatment of metal workpieces, such as quenching, tempering or annealing. After heating, the workpieces are cooled in these vacuum furnaces by a gaseous medium, eg nitrogen. Compared with conventional oil or salt bath quenching methods, this gas quenching has the advantage that it does not contaminate the workpiece, ie expensive cleaning measures are eliminated. In order to obtain a cooling effect in gas quenching similar to that of oil bath quenching or salt bath quenching methods, it is known to provide a higher cooling ensuring the required heat transfer due ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/00C21D1/18C21D1/613C21D1/767C21D1/773C21D9/00
CPCC21D1/773C21D1/767C21D9/0006C21D1/613
Inventor 卡尔-汉兹·莱姆肯
Owner IPUSEN INT
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