CN105648446A - Heat treatment process for 20CrMnTi gear steel - Google Patents

Abstract

The invention discloses a heat treatment process for 20CrMnTi gear steel. The heat treatment process for the 20CrMnTi gear steel is characterized in that the process includes the following steps that (1) blanking is performed, (2) forging is conducted, (3) normalizing is carried out, specifically, the heating temperature is 920 to 950 DEG C, heat preservation is performed for two to three hours, and then air cooling is performed; (4) machining is conducted; (5) cleaning is carried out; (6) carburizing is performed, specifically, gas carburizing is performed, the heating temperature is 900 to 920 DEG C, the heat preservation time is calculated according to 0.15 to 0.2 mm/h, and the heating temperature does not exceed 920 DEG C; (7) quenching is conducted, specifically, the heating temperature is 860 to 900 DEG C, heat preservation, oil cooling and vertical quenching into oil are performed in sequence, a large part is quenched into oil firstly, up-and-down movement is conducted after quenching into oil, and proper horizontal movement cooperates so as to improve the cooling speed of a workpiece; (8) tempering is performed, specifically, the heating temperature is 500-650 DEG C, heat preservation is performed for two hours, and then oil cooling is conducted; and (9) cleaning is carried out. The gear steel fabricated through the process is high in strength, good in tenacity and high in fatigue resistance.

Description

The thermal treatment process of a kind of 20CrMnTi Pinion Steel

Technical field

The present invention relates to the thermal treatment process of a kind of 20CrMnTi Pinion Steel.

Background technology

The thermal treatment process more complicated that current steel part adopts, also ununified specification, it does not have unified standard, cause the steel part quality of production uneven, a lot of operation that repeats also makes under production efficiency, increases the work burden of workman, makes the competitiveness of product in market not high simultaneously. For the operator that some have just been entered a profession, it does not have a clear and definite method technique, cause, when operation, mistakes and omissions often occur, even may cause serious consequence.

Summary of the invention

Because the above-mentioned defect of prior art, technical problem to be solved by this invention is to provide the thermal treatment process of a kind of 20CrMnTi Pinion Steel, and the Pinion Steel intensity height that this technique is made, good toughness, fatigue performance is strong.

For achieving the above object, the present invention provides the thermal treatment process of a kind of 20CrMnTi Pinion Steel, it is characterised in that, comprise the steps; 1) blanking; 2) forge; 3) normalizing: heat 920 ~ 950 DEG C, insulation 2-3h is empty cold; 4) process; 5) clean; 6) carburizing: carry out gas cementation, heats 900 ~ 920 DEG C, and in 0.15 ~ 0.2mm/h soaking time, Heating temperature is no more than 920 DEG C; 7) quench: heat 860 ~ 900 DEG C, insulation, oil is cold, vertically quench into, big part first quench into, quench and move up and down into after oil, then coordinate and suitably laterally move the speed of cooling to improve workpiece; 8) tempering: heat 500 ~ 650 DEG C, insulation 2h, oil is cold; 9) clean.

The invention has the beneficial effects as follows: technical scheme provided by the invention is the thermal treatment process of a kind of 20CrMnTi Pinion Steel, this invented technology is simple, eliminate a lot of repeatability operation, it is to increase working efficiency.

Embodiment

Technical scheme provided by the invention is the thermal treatment process of a kind of 20CrMnTi Pinion Steel, it is characterised in that, comprise the steps; 1) blanking; 2) forge; 3) normalizing: heat 920 ~ 950 DEG C, insulation 2-3h is empty cold; 4) process; 5) clean; 6) carburizing: carry out gas cementation, heats 900 ~ 920 DEG C, and in 0.15 ~ 0.2mm/h soaking time, Heating temperature is no more than 920 DEG C; 7) quench: heat 860 ~ 900 DEG C, insulation, oil is cold, vertically quench into, big part first quench into, quench and move up and down into after oil, then coordinate and suitably laterally move the speed of cooling to improve workpiece; 8) tempering: heat 500 ~ 650 DEG C, insulation 2h, oil is cold; 9) clean.

The technical scheme of the present invention improves working (machining) efficiency, yield rate, reduce production cost, achieve the technique effect that those skilled in the art are unexpected, overcome design set for a long time, provide a kind of new design and processing thought, and achieve processing effect more better than prior art.

Below the preferred embodiment of the present invention is described in detail. It is to be understood that the those of ordinary skill of this area just can make many modifications and variations according to the design of the present invention without the need to creative work. Therefore, the technical scheme that all technician in the art can be obtained by logical analysis, reasoning, or a limited experiment under this invention's idea on the basis of existing technology, all should by the determined protection domain of claim book.

Claims (1)

1. the thermal treatment process of a 20CrMnTi Pinion Steel, it is characterised in that, comprise the steps; 1) blanking; 2) forge;

3) normalizing: heat 920 ~ 950 DEG C, insulation 2-3h is empty cold;

4) process;

5) clean;

6) carburizing: carry out gas cementation, heats 900 ~ 920 DEG C, and in 0.15 ~ 0.2mm/h soaking time, Heating temperature is no more than 920 DEG C;

7) quench: heat 860 ~ 900 DEG C, insulation, oil is cold, vertically quench into, big part first quench into, quench and move up and down into after oil, then coordinate and suitably laterally move the speed of cooling to improve workpiece;

8) tempering: heat 500 ~ 650 DEG C, insulation 2h, oil is cold;

9) clean.