Quenching and tempering heat treatment machining method for cast steel
A quenching and tempering heat treatment and processing method technology, which is applied in the field of heat treatment of steel castings, can solve the problems of easy cracking of cast steel trimming edges, etc., and achieve the effects of solving easy cracking, improving mechanical properties, and improving plasticity
Pending Publication Date: 2021-11-26
格致汽车科技股份有限公司
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is: to provide a cast steel quenching and tempering heat treatment processing method, which can solve the problems of easy cracking of the cutting edge of cast steel under limited conditions, and eliminate the internal stress of the casting due to a large number of processing and complex shapes.
Method used
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Embodiment 1
[0031] Embodiment 1, the casting process adopts high-frequency hardening treatment
[0032] Pouring (according to the software to analyze the position of the riser, the position of the riser is not suitable for quenching and easy to crack)→diffusion annealing→quenching and tempering treatment→mechanical rough machining to leave a machining allowance of 1mm→stress relief→overall preheating temperature 200°C (reduce stress caused by temperature difference)→high Frequency quenching → heat preservation at an overall temperature of 200°C (to reduce stress caused by excessive temperature drop) → mechanical finishing.
[0033] High-frequency hardened cast steel matrix tensile strength 800 ~ 950N / mm 2 .
Embodiment 2
[0034] Embodiment 2, the casting process adopts laser hardening treatment
[0035] Casting→diffusion annealing→quenching and tempering→mechanical rough machining with a processing allowance of 1mm→stress relief→mechanical finishing→laser quenching.
[0036] Laser hardened cast steel matrix tensile strength 900-1050N / mm 2 .
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Abstract
The invention discloses a quenching and tempering heat treatment machining method for cast steel, and belongs to the technical field of steel casting heat treatment. The method comprises the following steps that the cast steel is heated to 960 DEG C, heat is preserved for a certain time, and furnace cooling is carried out; the cast steel is quenched, after the cast steel is heated to 880-960 DEG C for uniform temperature, heat preservation is conducted for 30 minutes, the cast steel is put into an oil pool to be cooled, the cast steel keeps moving in oil liquid, and the cast steel is stopped when the temperature is reduced to 70 DEG C; the quenched cast steel is heated to 650 DEG C, and secondary tempering is carried out after constant-speed cooling; and the quenched and tempered cast steel is subjected to mechanical rough machining and then heated to 650 DEG C, heat preservation is continuously carried out for 1-2 hours, constant-speed cooling is carried out, and the internal stress of the cast steel is removed. Under limited conditions, the problem that a cast steel trimming cutting edge is prone to cracking and the like is solved, and internal stress of a casting caused by mass machining and a complex body is eliminated.
Description
technical field [0001] The invention belongs to the technical field of heat treatment of steel castings, and in particular relates to a quenching and tempering heat treatment process of cast steel. Background technique [0002] 1. 2333 cast steel is a German air-cooled die steel, which is mainly used in the forming, trimming and punching of plates below 1mm in automobile dies. Therefore, 1.2333 cast steel is often used in the production of imported molds. Due to the high strength required for cast steel, general annealing cannot be used when making imported cast steel molds; 1.2333 cast steel requires the tensile strength of the cast steel matrix to reach 850N / mm 2 Above, after laser hardening treatment, the tensile strength of the cast steel matrix is 900-1050N / mm 2 , high-frequency hardened cast steel matrix tensile strength 800 ~ 950N / mm 2 . In the actual processing process, the forming surface and the cutting edge are easy to crack. It is found through observation...
Claims
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Patent Timeline
Login to View More IPC IPC(8): C21D1/26C21D1/25C21D1/30
CPCC21D1/26C21D1/25C21D1/30C21D2211/008
Inventor 兰少讯
Owner 格致汽车科技股份有限公司