The worm is an important part of the indexing head of the machine tool and must withstand huge friction during the working process. Therefore, worms are usually required to have high surface hardness, fatigue strength and a certain degree of toughness. In order to meet these requirements, many manufacturers use medium frequency induction heating equipment for heat treatment, with good results.
The material of the indexing head worm is 20Cr steel. Heat treatment technical requirements: carburized layer depth is 1.0-1.5mm, hardness ≥59HRC, radial circular runout ≤0.20mm.
(1) Process flow: normalizing-machining-carburizing-machining-quenching-tempering-finishing.
(2) Heat treatment process
1) Normalize the fire. Medium frequency induction heating equipment is used, the heating temperature is 900-920℃, and the holding time is 1-1.5h.
2) Carburizing. Use a well-type carburizing furnace and adopt a drip-type gas carburizing process. The carburizing temperature is 910-930℃ and the holding time is 3-4h. After the furnace is cooled to 840-860℃, it is transferred to a cooling tank with a protective atmosphere. Cool in medium.
3) Quenching. The carburized worm is locally heated using medium frequency heating equipment at a temperature of 830-850°C and quenched. Check the distortion, the radial circular runout of the worm is ≤0.20mm.
4) Tempering. The heating temperature is 180-200°C, the holding time is 2 hours, and it is air-cooled when it comes out of the oven.
After quenching by medium frequency induction heating equipment, the hardness, wear resistance and fatigue resistance of the worm have been greatly improved, meeting the needs of the work. What's even better is that this process is suitable for large-scale production and can greatly improve workers' production efficiency.
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GS-ZP-1200
