CN105734250A - Heat treatment process for 20CrMnMo gear - Google Patents

Abstract

The invention discloses a heat treatment process for a 20CrMnMo gear. The heat treatment process is characterized by including the following steps of (1) forging, specifically, external force is exerted on a metal billet to cause plastic deformation of the metal billet; (2) rough machining; (3) normalizing, specifically, the gear is preheated in a heating furnace with the furnace temperature being increased to 900-950 DEG C, and heat is preserved for 5 hours after carbon dioxide is introduced into the furnace as protective gas; (4) tempering, specifically, the gear is preheated in the heating furnace with the furnace temperature of 550-600 DEG C and heat is preserved for 120 minutes; (5) semi-finishing; (6) gear hobbing; (7) carburizing at the temperature of 900-920 DEG C, cooling to 800 DEG C and air cooling; (8) quenching in quenching oil; and (9) cleaning.

Description

20CrMnMo gear heat treatment technique

Technical field

The present invention relates to 20CrMnMo gear heat treatment technique.

Background technology

The Technology for Heating Processing that current gear adopts is more complicated, also without unified specification, it does not have unified standard, the steel part quality causing production is uneven, a lot of operations that repeat also make under production efficiency, increase the work burden of workman, make the competitiveness of product in market not high simultaneously.For some operators just entered a profession, it does not have a clear and definite method technique, cause, when operation, mistakes and omissions often occur, in some instances it may even be possible to cause serious consequence.

Summary of the invention

Because the drawbacks described above of prior art, the technical problem to be solved is to provide a kind of 20CrMnMo gear heat treatment technique, and this process is simple, eliminates a lot of repeatability operation, improves work efficiency.

For achieving the above object, the invention provides a kind of 20CrMnMo gear heat treatment technique, it is characterised in that comprise the steps, 1) forging: metal stock is applied external force so that it is produce plastic deformation；

2) roughing；

3) normalizing: being put into by gear and carry out the pre-heat treatment in heating furnace, furnace temperature rises to 900-950 DEG C, passes into carbon dioxide as protective gas, is incubated 5 hours；

4) tempering: put into by gear and carry out the pre-heat treatment in heating furnace, furnace temperature 550-600 DEG C, temperature retention time is 120 minutes；

5) semifinishing；

6) gear hobbing process；

7) Carburization Treatment: carry out Carburization Treatment at 900-920 DEG C, then cools to 800 DEG C and air-cooled；

8) quenching: quench in quenching oil；

9) clean.

The invention has the beneficial effects as follows: the present invention improves working (machining) efficiency, yield rate, reduce production cost, achieve the unforeseeable technique effect of those skilled in the art, overcome design set for a long time, provide a kind of new design and processing thought, and achieve more better processing effect than prior art.

Detailed description of the invention

Technical scheme provided by the invention is a kind of 20CrMnMo gear heat treatment technique, it is characterised in that comprise the steps, 1) forging: metal stock is applied external force so that it is produce plastic deformation；

2) roughing；

3) normalizing: being put into by gear and carry out the pre-heat treatment in heating furnace, furnace temperature rises to 900-950 DEG C, passes into carbon dioxide as protective gas, is incubated 5 hours；

4) tempering: put into by gear and carry out the pre-heat treatment in heating furnace, furnace temperature 550-600 DEG C, temperature retention time is 120 minutes；

5) semifinishing；

6) gear hobbing process；

7) Carburization Treatment: carry out Carburization Treatment at 900-920 DEG C, then cools to 800 DEG C and air-cooled；

8) quenching: quench in quenching oil；

9) clean.

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

The preferred embodiment of the present invention described in detail above.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to the design of the present invention without creative work.Therefore, all technical staff in the art, all should in the protection domain being defined in the patent claims under this invention's idea on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment.

Claims (1)

1. a 20CrMnMo gear heat treatment technique, it is characterised in that comprise the steps, 1) forging: metal stock is applied external force so that it is produce plastic deformation；

2) roughing；

3) normalizing: being put into by gear and carry out the pre-heat treatment in heating furnace, furnace temperature rises to 900-950 DEG C, passes into carbon dioxide as protective gas, is incubated 5 hours；

4) tempering: put into by gear and carry out the pre-heat treatment in heating furnace, furnace temperature 550-600 DEG C, temperature retention time is 120 minutes；

5) semifinishing；

6) gear hobbing process；

7) Carburization Treatment: carry out Carburization Treatment at 900-920 DEG C, then cools to 800 DEG C and air-cooled；

8) quenching: quench in quenching oil；

9) clean.