Sprocket tooth part induction heat treatment process

Abstract

The invention relates to a sprocket tooth part induction heat treatment process, which comprises the following steps: after installing an induction coil, installing a sprocket work piece at a work piece position in the induction coil, adjusting the heights of the induction coil and the sprocket work piece to ensure the centers of the induction coil and the sprocket tooth part to correspond with each other and to ensure the clearance to be uniform; supplying water and electricity to the induction coil and rotating the sprocket to ensure the tooth part to be heated; when the sprocket tooth part is heated to a quenching temperature, after the workpiece stays for 1.5-5 seconds in the air, leading the sprocket tooth part to enter into quenching oil vertically without rotation; taking the sprocket out of the quenching oil after quenching is finished, and washing after draining dry; and after draining dry again, putting the sprocket into a tempering furnace to be heated to a tempering temperature, and taking the sprocket out of the furnace when a holding time is reached. By adopting the sprocket tooth part induction heat treatment process, cracks or fracture of the sprocket tooth part can be avoided after the induction heat treatment, and after the induction heat treatment, the hardness of the sprocket tooth part is uniform, which differs within HRC 5 degrees, high-quality surface harness of the sprocket tooth part can be obtained, and the service life of the sprocket is prolonged.

Description

【Technical field】 [0001] The invention relates to the technical field of mechanical manufacturing, in particular to a surface induction heat treatment process of a sprocket. 【Background technique】 [0002] In the traditional sprocket tooth induction heat treatment process, the sprocket tooth induction heat treatment (45 carbon steel) is to use the rotating sprocket as a whole to immerse in water or rotate the whole to immerse in water-soluble quenching liquid, that is, after the sprocket is heated to the quenching temperature by induction, it will The rotating state is directly immersed in the quenching medium to cool and quench, and then tempered after taking it out, but this method has the following disadvantages: [0003] 1. Due to the excessive cooling rate of the quenching medium, the sprocket will have tooth cracks or fractures, especially in the 35, 40, and 50 series sprockets, the fracture phenomenon is more serious; [0004] 2. After the sprocket is induction quenc...

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Problems solved by technology

[0003] 1. Due to the excessive cooling rate of the quenching medium, the sprocket will have tooth cracks or fractures, especially in the 35, 40, and 50 series sprockets, the fracture phenomenon is more serious;

[0004] 2. After the sprocket is induction quenched by the above method, the hardness of the surface is uneven, that is, the hardness of the same part (such as the top of the tooth and the bottom of the tooth) is quite different, at least reaching HRC (Rockwell hardness) above 10 degrees; especially in The 60, 80, 100, and 120 series sprockets have more serious

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