Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Manufacturing method of automobile speed changing box alloy gear shaft

A technology of automobile gearbox and manufacturing method, applied in the field of alloy steel preparation, can solve problems such as free N damage, and achieve the effects of improving mechanical properties and reducing timeliness

Inactive Publication Date: 2016-02-03
HEFEI HAIYUAN MACHINERY
View PDF4 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art has never considered the harmfulness of some free N in the steel due to the lack of sufficient Al.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] A method for manufacturing an alloy gear shaft of an automobile gearbox includes the following steps:

[0014] (1) Control the chemical composition weight percentage of each element in molten steel should meet the following requirements: C2.3~2.5%, Mn1.2~1.4%, Cr1.6-1.9%, Si1.2~1.5%, Mg0.3 -0.6%, P0.016-0.044%, Ni0.38~0.52%, B0.015~0.025%, V0.22~0.34%, Zn0.01-0.04%, the balance Fe; the molten steel temperature is 1560 ℃, The pouring temperature of the outer layer is 1440°C, and the pouring temperature of the inner layer is 1540°C. The average flow rate of 2.3Kg / s is used for uniform pouring, and the rotational speed of the cold inner wall is controlled at 11m / s;

[0015] (2) Heat treatment: a, annealing: place the gear shaft in an annealing furnace with a temperature lower than 280°C, heat up to 750-780°C, keep warm for 56 ± 5 minutes, take out the furnace when the temperature is lower than 500°C, and air-cool; b, Quenching: Place the gear shaft in a quenching furnace ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a manufacturing method of an automobile speed changing box alloy gear shaft. The method comprises the following steps: controlling the weight percent of chemical components of various elements in molten steel to meet the following requirements: 2.3 to 2.5 percent of C, 1.2 to 1.4 percent of Mn, 1.6 to 1.9 percent of Cr, 1.2 to 1.5 percent of Si, 0.3 to 0.6 percent of Mg, 0.016 to 0.044 percent of P, 0.38 to 0.52 percent of Ni, 0.015 to 0.025 percent of B, 0.22 to 0.34 percent of V, 0.01 to 0.04 percent of Zn, and the balance of Fe. By adopting a specific addition step of the alloy elements, by using a direct-reading spectrum analysis instrument to control the components of molten steel and by adopting an alloy element proportioning scheme, the timeliness of the steel is maximally reduced, the alloy steel has relatively low content of Al, and no adverse impact on the subsequent cold processing is caused.

Description

technical field [0001] The invention relates to the field of alloy steel preparation, in particular to a method for manufacturing an alloy gear shaft of an automobile gearbox. Background technique [0002] 15CrMoG steel is a typical alloy structural steel for high-pressure boilers in the Chinese national standard GB5310-2008 (seamless steel pipes for high-pressure boilers), which contains 0.12% to 0.18% by weight of C, 0.17% to 0.37% of Si, 0.40% to 0.70% of Mn, 0.80% to 1.10% of Cr, 0.40% to 0.55% of Mo, not more than 0.025% of P, not more than 0.015% of S, not more than 0.20% of Cu, not more than 0.30% of Ni and V not greater than 0.08%. [0003] For 15CrMoG steel, it is also necessary to control the Al content at a lower level. In the case of insufficient Al in the steel, LF furnace refining or LF furnace refining + vacuum treatment can be used to avoid high-oxygen steel, and the method of controlling the rolling temperature can be used to refine the grains of the ste...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C22C38/56C21D1/18C21D9/32
Inventor 沈四海沈军
Owner HEFEI HAIYUAN MACHINERY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com