CN104831022A - Gear carburizing process - Google Patents

Abstract

The invention discloses a gear carburizing process. The gear carburizing process comprises the following steps: (1) carburizing; (2) pre-cooling; (3) performing primary quenching; (4) cleaning; (5) performing high-temperature tempering; (6) pre-heating; (7) performing secondary quenching; and (8) performing low-temperature tempering. The gear carburizing process has the beneficial effects that the content of residual austenite and the thickness of non-martensite layer on the gear surface are reduced.

Description

A kind of Gear Carbonization Process

Technical field

The invention belongs to carburizing tech field, particularly a kind of Gear Carbonization Process.

Background technology

Commonly use after into carburizing precooling at existing carburizing quenching process, direct quenching, but in the rear infiltration layer of quenching, remained austenite content is higher, especially for essential coarse-grained steel, surface easily forms carbide network, and surface hardness is difficult to reach technical requirements.Also have a kind of carburizing quenching process to be primary quenching after the cold sky of carburizing, performance makes moderate progress, but is still difficult to meet technical requirements for the key components and parts that mechanical property requirements is higher.Be typically employed in roll flute after carburizing and quenching, but stress can be changed into pressure by roll flute for this reason, unfavorable to the mechanical property of workpiece; Or carry out shot peening strengthening, but this stress decays in high speed rotating heat-dissipating, affects its mechanical property.

Summary of the invention

The present invention proposes a kind of plant left-hand thread ring.

Technical scheme of the present invention is achieved in that a kind of Gear Carbonization Process, comprises the steps:

1) carburizing, carburizing temperature is 800-825 DEG C;

2) precooling, is chilled to 7150-740 DEG C in advance by gear, insulation 2-3 hour;

3) primary quenching, by gear dip quench oil, temperature remains on 100-120 DEG C, and stirs quenching oil;

4) clean, with gasoline, gear is cleaned;

5) high tempering, is heated to 720-730 DEG C by gear, and is incubated 2-3 hour, and high tempering carries out within an hour after primary quenching;

6) preheating, is preheated to 730-740 DEG C by gear, insulation 2-3 hour;

7) secondary quenching, by gear dip quench oil, temperature remains on 125-130 DEG C, and stirs quenching oil;

8) low-temperaturetempering, is heated to 160-170 DEG C by gear, and is incubated 2-3 hour, and high tempering carries out within an hour after secondary quenching.

Beneficial effect of the present invention: the present invention makes gear surface residual austenite content and non-martensite layer thickness reduce.

Embodiment

Embodiment provided by the invention is described in further detail in conjunction with the embodiments:

A kind of Gear Carbonization Process, comprises the steps:

1) carburizing, carburizing temperature is 800-825 DEG C;

2) precooling, is chilled to 7150-740 DEG C in advance by gear, insulation 2-3 hour;

3) primary quenching, by gear dip quench oil, temperature remains on 100-120 DEG C, and stirs quenching oil;

4) clean, with gasoline, gear is cleaned;

5) high tempering, is heated to 720-730 DEG C by gear, and is incubated 2-3 hour, and high tempering carries out within an hour after primary quenching;

6) preheating, is preheated to 730-740 DEG C by gear, insulation 2-3 hour;

7) secondary quenching, by gear dip quench oil, temperature remains on 125-130 DEG C, and stirs quenching oil;

8) low-temperaturetempering, is heated to 160-170 DEG C by gear, and is incubated 2-3 hour, and high tempering carries out within an hour after secondary quenching.

The present invention makes gear surface residual austenite content and non-martensite layer thickness reduce.

In this description, the present invention is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from the spirit and scope of the present invention.Therefore, specification sheets is regarded in an illustrative, rather than a restrictive.

Claims (1)

1. a Gear Carbonization Process, is characterized in that, comprises the steps:

1) carburizing, carburizing temperature is 800-825 DEG C;

2) precooling, is chilled to 7150-740 DEG C in advance by gear, insulation 2-3 hour;

3) primary quenching, by gear dip quench oil, temperature remains on 100-120 DEG C, and stirs quenching oil;

4) clean, with gasoline, gear is cleaned;

5) high tempering, is heated to 720-730 DEG C by gear, and is incubated 2-3 hour, and high tempering carries out within an hour after primary quenching;

6) preheating, is preheated to 730-740 DEG C by gear, insulation 2-3 hour;

7) secondary quenching, by gear dip quench oil, temperature remains on 125-130 DEG C, and stirs quenching oil;

8) low-temperaturetempering, is heated to 160-170 DEG C by gear, and is incubated 2-3 hour, and high tempering carries out within an hour after secondary quenching.