MESSAGE
中文版 English
Slewing Bearing
Slewing Drive
Others

Xuzhou Shambon Machinery CO.,LTD
Add:Tongshan High-tech Development Zone, Xuzhou, Jiangsu Province, China.
Tel:+86-516-83406186
Fax:+86-516-80296010
E-Mail:info@xzshangbang.com

  FAQ Home>> FAQ

Medium Frequency Hardening in Slewing Bearing
Source :    Publication date: 2014/4/29    Read the number: 1231

Appication of Medium Frequency Hardening in Slewing Bearing
 
As the component parts of construction machinery,slewing bearing is mainly used in tower crane,crane,excavator and port machinery. Because of the specificity in composition,the quality impact the usage efficiency of host directly.
Slewing bearing ‘s ife time depends on the quality of medium frequency hardening,and the inner quality depends on the depth of hardening zone, shape distribution,hardness,crack condition, hardening organization and other aspects,so we control the hardening quality by sensor, sprinkler,heat temperature and hardening liquid.
1.     processing and technical requirements
Slewing bearing processing:
Rough lathing - Finish lathing -Hardening-Drilling-Grinding- Assembly
Technical requirements:
Depth of hardening zone:3-5mm, hardness:55-62HRC,no crack.
The chemical composition of the material
 
 
No
 
The chemical composition %
C
Si
Mn
Mo
Cr
Ni
S
P
Cu
42CrMo
0.38~0.45
0.17~0.37
0.50~0.80
0.15~0.25
0.90~1.2
≤0.30
≤0.035
≤0.035
≤0.30
50Mn
0.48~0.56
0.17~0.37
0.70~1.00
---
≤0.25
≤0.25
≤0.035
≤0.035
≤0.25
Note: The chemical composition of the other material must obey the standard set by the country, the allowed dispersion of the chemical composition must accord to the provision of GB222
2.     Establish of induction hardening
1)     Characteristic of induction heating
The induction heating uses the principle of electromagnetic induction, create the induced current in the working surface,means forming the turbulent flow.
2)     Confirmation of induction hardening technical data
 Medium Frequency Hardening process include: confirming hardening temperature,pre-cold time,density of hardening liquid and so on.
l  Hardening heat time
Induction heat means quick heat, the temperature is more higher than normal hardening heat.
l  Heating temperature is closely related to the steel''s original organization . The more thin , the more easier phase transition occurs in heating. . Therefore, the heating temperature can be appropriately reduced .
l  the majority of rough materials used in factory is in pre-modulated modulation and normalizing state ,quenching temperature can be lower .As to the 50Mn and 42CrMo material , quenching temperature should be 900-950 degrees .
l  Pre-cooling time  
the purpose of pre-cooling is to reduce quenching deformation, stop quenching cracks .
l  Cooling          
 The way of cooling shoud be linked to the workpiece material, heating method and depth of hardened layer.
l  Tempering
Slewing bearing hardening will do rapid heating and cooling to partial surface of the workpiece, leading to large thermal stress and organizational stress . After the completion of organizational changes, form into higher residual stress. So, must be done low temperature tempering in order to eliminate part of the stress.
  Technology application above is also used in different size rolling or different material but basically same carbon content, hardenability slewing bearing . Detection after quenching , the test results can basically meet the technical requirements.
 
www.aljalj.com






 
All rights reserved Xuzhou Shambon Machinery CO.,LTD ADD:Tongshan High-tech Development Zone, Xuzhou, Jiangsu Province, China.
Tel:+86-516-83406186 Fax:+86-516-80296010 E-Mail:info@xzshangbang.com
欧美牲交a欧美牲交aⅴ电影_中文字幕无码手机在线看片_nana在线观看免费