Three-time tempering furnace

Abstract

The invention discloses a three-time tempering furnace. The three-time tempering furnace comprises a main body, wherein a furnace cover is fixedly connected above the main body, nine sliding pipes are evenly distributed on the inner portion of the main body in three layers, and the sliding pipes are fixedly connected with the main body through a support frame; a ceramic guide rail is arranged in each sliding pipe, and clamping grooves are formed in the two sides of each ceramic guide rail and the middle of the lower portion of each ceramic guide rail; a clamping block is clamped in each clamping groove, and the clamping blocks are fixedly connected with the sliding pipes. The three-time tempering furnace is characterized in that a resistance belt installed in an opening in the ceramic guide rail is repeatedly subjected to heat treatment for three times, so that a heat-treated saw blade can be uniformly heated, and meanwhile, the tempering frequency is increased, the tempering is more sufficient, for three times of tempering is the theoretically optimal tempering frequency, thus ensuring the heat treatment effect; in addition, the cooling is carried out through nitrogen, so that the problems that the cooling speed is too low or the desirable cooling temperature can not be achieved due to the fact that the cooling is conducted through the room temperature air are avoided, and meanwhile the cooling time is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of tempering furnaces, in particular to a three-time tempering furnace. Background technique [0002] Tempering is a heat treatment process in which the workpiece is heated to a temperature below Ac1 (the starting temperature of the transformation from pearlite to austenite during heating) after quenching, kept for a certain period of time, and then cooled to room temperature. The existing ordinary online tempering furnace generally At about 10 to 15 meters, due to the short length of the tempering furnace and insufficient tempering during heat treatment production, the hardness of the bimetallic band saw blade product is unstable, which affects the stability of product quality. At the same time, air cooling or oil cooling is generally used for cooling , Cooling by room temperature air will cause the cooling speed to be too slow, or the cooling temperature will not be reached, and the cooling time will be gr...

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Problems solved by technology

[0002] Tempering is a heat treatment process in which the workpiece is heated to a temperature below Ac1 (the starting temperature of the transformation from pearlite to austenite during heating) after quenching, kept for a certain period of time, and then cooled to room temperature. The existing ordinary online tempering furnace generally At about 10 to 15 meters, due to the short length of the tempering furnace and insufficient tempering during heat treatment production, the hardness of the bimetallic band saw blade product is unstable, which affects the stability of product quality. At the same time, air cooling or oil cooling is generally used for cooling , Cooling by room temperature air will cause the cooling speed to be too slow, or the cooling temperature will not be reached, and the cooling time will be greatly increased, and the efficiency of heat treatment will be reduced. When the saw blade is cooled by oil cooling, the cooling oil will drip It falls to various places inside the main body, which saves the time-consuming and laborious operation of cleaning up the oil stains. At the same time, the oil attached to the surface of the saw blade will affect the effect of the next tempering

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