CN102392260A - Carburizing direct quenching process for large-scale wind power gear/gear shaft - Google Patents

Abstract

The invention relates to a carburizing direct quenching process for a large-scale wind power gear/gear shaft. The process comprises the following steps of: (1) carburizing at the temperature of between 910 and 970 DEG C for 8 to 72 hours, wherein C1 is 0.9 to 1.2 percent C; (2) diffusing at the temperature of between 910 and 970 DEG C for 2 to 8 hours, wherein C2 is 0.65 to 0.9 percent C; (3) keeping temperature at low temperature of between 620 and 700 DEG C for 2 to 8 hours; (4) keeping the temperature at the temperature of between 810 and 850 DEG C for 2 to 8 hours before oil extraction; (5) performing the oil extraction, namely moving workpieces from a carburizing furnace to a quenching furnace for quenching; and (6) tempering in a tempering furnace at the temperature of between 150 and 200 DEG C for 4 to 48 hours. In the carburizing direct quenching process for the large-scale wind power gear/gear shaft, a process of direct tapping and quenching after carburizing is adopted, the intermediate temperature heat-preserving phase after the carburizing is added, the time of the process is reduced by about one third, the cost is reduced by about one half, the length of martensite of the workpieces can be reduced, and the number of residual austenite can be reduced obviously.

Description

The carburizing direct quenching technology of large-scale wind electricity gear/tooth axle

Technical field

The present invention relates to the large gear case production technical field of wind power equipment, the carburizing direct quenching technology of particularly a kind of large-scale wind electricity gear/tooth axle.

Background technology

At present, the carburization process kind of large gear/tooth axle is many, and technical process is complicated.Need pass through by force mostly like, the carburization process of traditional large gear/tooth axle ooze, steps such as diffusion, slow cooling, oil quenching, tempering, that is: slow cooling to the room temperature of coming out of the stove after the carburizing, reheat is to the quenching temperature quenching of coming out of the stove, what also have increased the normalizing preface before quenching.It is thus clear that the route of traditional carburization process is very complicated, need take equipment man-hour long, cost is higher, can't satisfy the production demand of mass-producing, high efficiency.

Summary of the invention

The objective of the invention is to overcome the deficiency of prior art, provide that a kind of technology is simple, cost is low, the carburizing direct quenching technology of workable, stay-in-grade large-scale wind electricity gear/tooth axle.

The present invention solves its technical problem and takes following technical scheme to realize:

The carburizing direct quenching technology of a kind of large-scale wind electricity gear/tooth axle, it is characterized in that: process step is:

(1) ooze by force: in cementing furnace, ooze by force, ooze temperature by force and be: 910-970 ℃, the time is 8-72 hour, and C1 is: 0.9-1.2%C;

(2) diffusion: in cementing furnace, spread, diffusion temperature is: 910-970 ℃, the time is 2-8 hour, and C2 is: 0.65-0.9%C;

(3) low temperature insulation: in cementing furnace, be incubated, holding temperature is: 620-700 ℃, the time is 2-8 hour;

(4) oil collection preincubation: holding temperature is: 810-850 ℃, the time is 2-8 hour;

(5) oil collection: workpiece shifts out in cementing furnace to the quenching furnance and quenches;

(6) tempering: in tempering stove, carry out tempering, tempering temperature is: 150-200 ℃, the time is 4-48 hour.

Advantage of the present invention and positively effect are:

The carburizing direct quenching technology of large-scale wind electricity gear of the present invention/tooth axle; Adopt the operational path of directly coming out of the stove and quenching after the carburizing, increase the middle temperature holding stage after oozing by force, the process time reduces about 1/3rd; Cost reduces about 1/2nd; The martensitic length of workpiece is reduced, and residual austenite quantity obviously reduces, and reaches the technical requirements of ME level in the ISO6336-5 standard.

Description of drawings

Fig. 1 is the process curve figure of prior art carburization process;

Fig. 2 is the process curve figure of carburization process of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the present invention is made further detailed description through specific embodiment.Following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.

The carburizing direct quenching technology of a kind of large-scale wind electricity gear/tooth axle, its process step is:

(1) ooze by force: in cementing furnace, ooze by force, ooze temperature by force and be: 910-970 ℃, the time is 8-72 hour, and C1 is: 0.9-1.2%C;

(2) diffusion: in cementing furnace, spread, diffusion temperature is: 910-970 ℃, the time is 2-8 hour, and C2 is: 0.65-0.9%C

(3) low temperature insulation: in cementing furnace, be incubated, holding temperature is: 620-700 ℃, the time is 2-8 hour;

(4) oil collection preincubation: holding temperature is: 810-850 ℃, the time is 2-8 hour,

(5) oil collection: workpiece shifts out in cementing furnace to the quenching furnance and quenches;

(6) tempering: in tempering stove, carry out tempering, tempering temperature is: 150-200 ℃, the time is 4-48 hour.

With 1.2 millimeters layer depths of cementation zone is example, and each process step required time is as shown in the table:

Step	Carburizing direct quenching technology of the present invention (hour)	Traditional carburization process (hour)
			Ooze the time by force	20	20
Diffusion time	3	3
			The slow cooling time	---	12
The low temperature soaking time	10	---
			The oil quenching preincubation time	2	---
The second-heating soaking time	---	8
			Total time	35	43

	Carburizing direct quenching	Traditional carburization process
			Ooze the time by force	75	75
Diffusion time	8	8
			The slow cooling time	---	28
The low temperature soaking time	10	---
			The oil quenching preincubation time	2	---
The second-heating soaking time	---	12
			Total time	95	123

It is thus clear that, adopt the operational path of directly coming out of the stove and quenching after the carburizing, increase the middle temperature holding stage after oozing by force, the process time reduces about 1/3rd, and cost reduces about 1/2nd.

Although disclose embodiments of the invention and accompanying drawing for the purpose of illustration; But it will be appreciated by those skilled in the art that: in spirit that does not break away from the present invention and accompanying claims and scope; Various replacements, variation and modification all are possible; Therefore, scope of the present invention is not limited to embodiment and the disclosed content of accompanying drawing.

Claims (1)

1. the carburizing direct quenching technology of large-scale wind electricity gear/tooth axle, it is characterized in that: process step is:

(1) ooze by force: in cementing furnace, ooze by force, ooze temperature by force and be: 910-970 ℃, the time is 8-72 hour, and C1 is: 0.9-1.2%C;

(2) diffusion: in cementing furnace, spread, diffusion temperature is: 910-970 ℃, the time is 2-8 hour, and C2 is: 0.65-0.9%C;

(3) low temperature insulation: in cementing furnace, be incubated, holding temperature is: 620-700 ℃, the time is 2-8 hour;

(4) oil collection preincubation: holding temperature is: 810-850 ℃, the time is 2-8 hour;

(5) oil collection: workpiece shifts out in cementing furnace to the quenching furnance and quenches;

(6) tempering: in tempering stove, carry out tempering, tempering temperature is: 150-200 ℃, the time is 4-48 hour.

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