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Method for machining gear parts from gear round steel and gear parts

A technology of gears and round steel, applied to components with teeth, belts/chains/gears, manufacturing tools, etc., can solve problems such as unguaranteed, reduced gear hardness dispersion, and uncontrollable risks

Active Publication Date: 2021-08-03
BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process control method needs to control too many process conditions, and the variability is large. For round steel with different performance components, its uncontrollable risk is large, and it cannot guarantee that the structure uniformity of the gear steel can be effectively improved, let alone effectively Reduce the hardness dispersion of gears

Method used

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  • Method for machining gear parts from gear round steel and gear parts
  • Method for machining gear parts from gear round steel and gear parts
  • Method for machining gear parts from gear round steel and gear parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3 and comparative example 1～9

[0109] A gear part is provided, which is prepared according to the following preparation steps.

[0110] The chemical components of Examples 1-3 and Comparative Examples 1-9 are formulated according to Table 1.

[0111] First, the preparation of gear round steel includes:

[0112] The first step: converter smelting;

[0113] The second step: refining outside the furnace;

[0114] The third step: RH vacuum degassing;

[0115] The fourth step: billet continuous casting;

[0116] The fifth step: heating and rolling.

[0117] Then, processing the prepared gear round steel into gear parts, including: heating, forging and isothermal normalizing the gear round steel;

[0118] Isothermal normalizing includes: heating homogenization, cooling and air cooling.

[0119] The specific parameters of slab continuous casting process, slab heating process, rough rolling process and isothermal normalizing process are shown in Table 2.

[0120] The chemical composition (wt%) of table 1 gea...

experiment example

[0126] 1. The morphology of the gear parts provided in Example 2 and Comparative Example 6 was detected by a scanning electron microscope.

[0127] See the test results in the attached figure 1 and 2 . figure 1 The microscopic morphology of the gear parts provided in Example 2 is shown. figure 2 The microscopic morphology of the gear parts provided in Comparative Example 6 is shown. From figure 1 It can be seen that the structure of the gear part provided by Example 2 only includes F ferrite phase and P pearlite structure. And the F ferrite phase and P pearlite structure are uniform. And the gear parts provided by comparative example 6, thus figure 2 As can be seen, figure 2 There is a large dark area in the middle part, and the whole structure is very uneven. The essence is that the structure of the gear part of Comparative Example 6 not only includes F ferrite phase and P pearlite structure, but also includes granular B, so that The organization of the entire gear...

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Abstract

The present application relates to the field of steel manufacturing, in particular, to a method for machining gear parts from gear round steel and the gear parts. This method includes placing a plurality of gear parts vertically in the sample frame for heating and homogenization, the interval between the gear parts is 70-90mm; using cold air for cooling for 180-220s, and the opening degree of the air-cooled flow regulating valve is 15-25% , the cooling time of reflux hot air is 280~320s; the temperature drops to 655~665℃, and the heat preservation time is 290~310min. Place multiple gear parts vertically in the sample frame for heating and homogenization. The gear parts are separated by 70-90mm without contact with each other. +P, structure ≤ grade 3, and the hardness dispersion control of different positions of the same tooth blank part is ≤ 4HBW, and in the same frame, the hardness dispersion control of tooth blank parts is ≤ 6HBW.

Description

technical field [0001] The present application relates to the field of steel manufacturing, in particular, to a method for machining gear parts from gear round steel and the gear parts. Background technique [0002] Carburized gear forging blanks generally require isothermal normalizing heat treatment to obtain a uniform structure and suitable processing hardness, and prepare the structure for subsequent carburizing in order to reduce quenching deformation. [0003] Some known methods to improve the uniformity of gear steel structure include: [0004] (1) Residual heat normalizing after forging: carry out residual heat normalizing treatment on the gear forging after hot forging; [0005] (2) Machining: turning outer circle, inner hole and end face, inserting keyway, deburring; [0006] (3) Cleaning: Clean and remove grease, dirt and scale on the surface of gear forgings; [0007] (4) Pre-oxidation: Push the cleaned gear forging into the pre-oxidation furnace chamber of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D1/28C21D6/00C21D8/00C21D9/32C22C38/02C22C38/04C22C38/06C22C38/44C22C38/50B22D11/16B22D11/22F16H55/06
CPCB22D11/16B22D11/225C21D1/28C21D6/004C21D6/005C21D6/008C21D8/005C21D9/32C21D2211/005C21D2211/009C22C38/001C22C38/002C22C38/02C22C38/04C22C38/06C22C38/44C22C38/50F16H55/06F16H2055/065
Inventor 刘年富赵贺楠吴学兴杨伟光董凤奎王银国
Owner BAOSTEEL SPECIAL STEEL SHAOGUAN CO LTD
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