A Heat Treatment Method Applicable to Cone Crusher Castings

Abstract

The invention relates to a heat treatment method for high-strength steel castings, in particular to a heat treatment method suitable for cone crusher castings. The method is to heat the castings at a heating rate of 40-100 °C / h, and the temperature rises to 900-900 °C. Keep warm in the furnace at 950°C for 8~12h, hold it for 8~12h, then take it out of the furnace, and perform tap water quenching. When the casting is cooled below 200°C, temper it within 0~3h. The tempering temperature rise rate is 40~100°C / h. When the temperature rises to 600~650℃, keep it in the furnace for 8~12 hours, and then cool it naturally; the method of the invention is unique, which not only solves the problem of insufficient hardness of the casting body, but also solves the problem of easy cracking of the casting, ensuring product quality. It improves the welding repairability of subsequent defects in steel castings, and has achieved good results and benefits in batch production.

Description

technical field [0001] The invention relates to a heat treatment method for high-strength steel castings, in particular to a heat treatment method suitable for cone crusher castings. Background technique [0002] Cone crusher is one of the most widely used mining equipment, which is used in metallurgy, chemical industry, refractory materials, hydropower, urban construction, highway and other industries to finely crush various ores and rocks. The main frame casting of the cone crusher is the skeleton of the whole machine. Due to the harsh working environment, the design requires it to have high strength and hardness. Huge impact force requires a bush hardness range of 200~223 HB. In the prior art, the chemical composition and mass percentage ratio of the casting material of the main frame of the cone crusher are: C: 0.25~0.35, Si: 0.20~1.00, Mn: 0.7~1.75, P ≤ 0.040, S ≤ 0.040, Cr≤0.25, Mo≤0.25, Ni≤0.50, and the rest is Fe. The main mechanical performance indicators require...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a unique method, which not only solves the problem of insufficient hardness of the casting body, but also solves the problem of easy cracking of the casting, ensures product quality, and improves the subsequent defects of steel castings. It is a heat treatment method suitable for cone crusher castings that has achieved good results and benefits in batch production.