A vacuum furnace quenching process

Abstract

The invention discloses a vacuum furnace quenching process. The vacuum furnace quenching process comprises the following work procedures: (1) a liquid discharge pump extracts quenching liquid in a quenching pool to a preparation bin; and a vacuum furnace is vacuumized; (2) a heat insulating door is opened; after a workpiece is put in a heating chamber, the heat insulating door is closed; and the workpiece is heated; (3) after the heating of the workpiece is finished, the heat insulating door is opened to take out the workpiece; the heat insulating door is closed; and the workpiece is precooled in a precooling chamber; (4) a liquid returning pump injects the quenching liquid of the preparation bin into the quenching pool; after the quenching liquid reaches a certain volume, the workpiece is descended into the quenching pool for quenching; and (5) after the quenching is finished, a furnace door is opened to take out the workpiece; and if a new production requirement is generated, the first step is returned to for recycling. The vacuum furnace quenching process causes no oxidation damage to the heating chamber, prevents the intergranular oxidation or decarbonization of a heated metal part, and can be intermittently used to achieve the effect of flexible production transfer; and a water soluble quenching medium can be used, so that the vacuum furnace quenching process is suitable for a part with the high requirement on the quenching and cooling speed so as to obtain the higher hardening depth and hardness uniformity.

Description

technical field [0001] The invention relates to a vacuum furnace quenching process. Background technique [0002] Existing parts are quenched using a vacuum furnace. When the vacuum furnace is quenched with oil and gas, the quenching speed is slow, which reduces the production efficiency, and some materials cannot be used in this kind of vacuum furnace, which has great limitations; if the vacuum furnace is quenched with water If the soluble quenching medium is quenched, the steam of water enters the heating chamber, which will damage the heating chamber and parts; in view of the above shortcomings, a multi-purpose furnace that can be quenched with water-soluble quenching medium has appeared in the industry, but the multi-purpose furnace has the following disadvantages: (1 ) The atmosphere contains oxygen, which causes the grain boundary to oxidize, and the appearance of the parts is black; (2) It cannot be used intermittently, which will waste resources and increase producti...

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Problems solved by technology

[0002] Existing parts are quenched in a vacuum furnace. When the vacuum furnace is quenched with oil and gas, the quenching speed is slow, which reduces the production efficiency, and some materials cannot be applied to this kind of vacuum furnace, which has great limitations; if the vacuum furnace is quenched with water If the soluble quenching medium is quenched, the steam of water enters the heating chamber, which will damage the heating chamber and parts; in view of the above shortcomings, a multi-purpose furnace that can be quenched with a water-soluble quenching medium has appeared in the industry, but the multi-purpose furnace has the following disadvantages: (1 ) The atmosphere contains oxygen, which causes the grain boundary to oxidize, and the appearance of the parts is black; (2) It cannot be used intermittently, which will waste resources and increase production costs. time, but also increase production costs

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