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A quenching and tempering treatment method for a spline shaft

A technology of quenching and tempering treatment and spline shaft, which is used in heat treatment furnaces, heat treatment equipment, furnaces, etc., can solve the problems of shallow hardening layer, low surface hardness of shaft body, weak anti-peeling and anti-accident ability, etc. Grinding and fatigue resistance, the effect of improving hardenability and hardenability, and strengthening mechanical properties

Active Publication Date: 2019-01-11
LIANYUNGANG JIANGNAN PRECISION MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the surface hardness of spline shaft products is low, the hardened layer is shallow, and the anti-stripping and anti-accident capabilities are weak, which cannot meet the requirements of use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A quenching and tempering treatment method for a spline shaft, characterized in that, the spline shaft has a martensitic structure and a bainite structure within a range from the surface to 20 mm below the surface, and the core is a pearlite structure; the quenched and tempered The processing method includes the following steps:

[0017] (1) After quenching and heating the spline shaft blank to 950°C for 1 hour, oil cooling;

[0018] (2) When the spline shaft blank is cooled to 200°C, put it into a tempering furnace, heat it at 700°C for 0.5h for tempering treatment, then cool it to 250°C with the furnace, heat it to 500°C for secondary tempering, After keeping warm for 1 hour, take it out of the oven and air cool to room temperature.

[0019] Before the quenching and tempering treatment, firstly heat the spline shaft blank to 1100°C, hold it for 2 hours, and then take it out of the furnace for forging; then heat the forged spline shaft blank to 1100°C for austenitizat...

Embodiment 2

[0024] A quenching and tempering treatment method for a spline shaft, characterized in that, the spline shaft has a martensite structure and a bainite structure within a range of 40 mm below the surface from the surface of the spline shaft, and the core is a pearlite structure; The processing method includes the following steps:

[0025] (1) After quenching and heating the spline shaft blank to 1050°C for 0.5h, oil cooling;

[0026] (2) When the spline shaft blank is cooled to 350°C, put it into a tempering furnace, heat it at 600°C for 1 hour and temper it, then cool it to 300°C with the furnace, heat it to 450°C for a second tempering, and keep it warm After 2 hours, take it out of the oven and air cool to room temperature.

[0027] Before the quenching and tempering treatment, firstly heat the spline shaft blank to 1200°C, hold it for 1 hour, and then take it out of the furnace for forging; then heat the forged spline shaft blank to 1000°C for austenitization for 1 hour, a...

Embodiment 3

[0032] A quenching and tempering treatment method for a spline shaft, characterized in that, the spline shaft has a martensite structure and a bainite structure within a range from the surface of the spline shaft to 30 mm below the surface, and the core is a pearlite structure; The processing method includes the following steps:

[0033] (1) Quenching and heating the spline shaft blank to 1000°C for 1 hour, then oil cooling;

[0034] (2) When the spline shaft blank is cooled to 250°C, put it into a tempering furnace, heat it at 600°C for 0.5h and temper it, then cool it to 280°C with the furnace, heat it to 480°C for secondary tempering, After keeping warm for 1 hour, take it out of the oven and air cool to room temperature.

[0035] Before the quenching and tempering treatment, firstly heat the spline shaft blank to 1100°C, hold it for 1 hour, and then take it out of the furnace for forging; then heat the forged spline shaft blank to 1000°C for 0.5 hour to austenitize, and t...

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PUM

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Abstract

The invention relates to a quenching and tempering method for a spline shaft. According to the method, through quenching and two-time tempering steps in quenching and tempering treatment and optimization of the temperature and time required in the steps such as normalization and spheroidizing annealing in pre-heating treatment, the mechanical property of the spline shaft is enhanced, and the idealhardness and uniformity of hardness are obtained; by adding Mn, Cr, Zr, Nb, a rear earth element Y and a rear earth element La, the components of the spline shaft are optimized, so that the austenitestability of the spline shaft is improved remarkably, the hardenability and hardening capacity of the spline shaft are improved, and the abrasive resistance and fatigue resistance of the product areimproved; and the martensite structure and the bainite fine grain structure are obtained on the surface of the spline shaft.

Description

technical field [0001] The invention relates to the field of metal heat treatment, in particular to a quenching and tempering treatment method for a spline shaft. Background technique [0002] Splines and spline shafts are key parts in the transmission system of various mechanical equipment, and their performance directly affects the overall quality of the product. The alloying system and hardenability of the steel for the spline shaft determine the overall performance of the spline and the spline shaft. After the spline shaft is quenched, it is necessary to ensure a reasonable core hardness. When selecting materials for spline shaft processing, steels with different hardenability should be selected for spline shafts with different requirements, so that the workpiece can meet service requirements and good comprehensive mechanical properties. . On the other hand, during the heat treatment process of the spline shaft, under the joint action of thermal stress and tissue stres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/25C21D9/28C21D1/32C21D1/28C21D8/00C22C38/02C22C38/04C22C38/38C22C38/28C22C38/26
CPCC21D1/25C21D1/28C21D1/32C21D8/005C21D9/28C21D2211/002C21D2211/008C22C38/005C22C38/02C22C38/04C22C38/26C22C38/28C22C38/38
Inventor 刘仕爽
Owner LIANYUNGANG JIANGNAN PRECISION MACHINERY MFG CO LTD
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