Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (6): 1959-1966.doi: 10.13229/j.cnki.jdxbgxb20200647

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Influences of interference fit and knurling connection type on press fitting failure of assembled camshaft

Jian-bin CHEN1,2,3(),Song-ze ZHOU3,Feng-yong FEI2,Yong-long CHEN2,Guo-ping LING1   

  1. 1.School of Materials Science and Engineering，Zhejiang University，Hangzhou 310058，China
    2.SLPT State-level Enterprise Engineering Center，Ningbo Shenglong Group Co. ，Ltd. ，Ningbo 315000，China
    3.School of Mechanical Engineering and Mechanics，Ningbo University，Ningbo 315211，China
  • Received:2020-08-20 Online:2021-11-01 Published:2021-11-15

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Abstract:

Based on the finite element method， the influences of the interference fit and knurling connection types on the two major press fitting failure problems including plastic deformation and sliding during knurling connection of assembled camshaft were investigated. The results indicate that a large press fitting force and frictional shear stress could be obtained for a large interference fit to inhibit the sliding between the fit surfaces. On the other hand， the cam profile’s radial displacement magnitude and gradient change increase with the e interference fit， resulting in an obvious stress concentration around the transition region of cam profile. To keep the fit surfaces from sliding， the axial knurling connection is suggested when the hardness of shaft is larger than that of cam. Instead， the radial knurling connection is more beneficial to inhibit the occurrence of sliding between the fit surfaces for a assembled camshaft with a softer shaft. The press fitting force obtained from the radial knurling connection test of assembled camshaft validates the rationality of both the 1/36 finite element model and the complete finite element model.

Key words: vehicle engineering, assembled camshaft, knurling connection, interference fit, connection strength, plastic deformation

CLC Number: 

  • U466

Fig.1

Typical knurling connection types"

Fig.2

Cracking failure near the transitionregion of cam profile"

Fig.3

Geometry size of the cam and knurling tool"

Fig.4

Flow stress of 100Cr6"

Table 1

Material properties of 100Cr6 and E355"

材料

密度

/（kg·m-3）

弹性模量/GPa泊松比屈服强度/MPa
100Cr67.83×1032120.269552.8
E3557.80×1032090.300345.0

Fig.5

Simulation model of assembled camshaft"

Fig.6

Displacement nephogram of the cam"

Fig.7

Hoop stress contour of the cam"

Fig.8

Frictional shear stress on contact surface of shaft"

Fig.9

Press fitting force history of the cam"

Fig.10

Frictional shear stress of the shaftin axial knurling connection"

Fig.11

Press fitting force of cam for axialknurling connection"

Fig.12

Test equipment for radial knurling connection"

Table 2

Press fitting force measured from experiment"

试验组别第1组第2组第3组第4组
凸轮117.2317.9918.1118.99
凸轮214.8615.7015.4215.63
凸轮315.3716.1916.9216.00
凸轮414.9715.9616.4315.42
凸轮515.7816.9816.2216.26
凸轮616.2816.3215.9816.80
凸轮715.7515.7416.1216.17
凸轮814.6416.3415.7815.74

Fig.13

Equipment and sample for stress testing"

Table 3

Residual stress tested by XRDduring press fitting"

试验

组别

腐蚀深度/mm第1次应力值/MPa第2次应力值/MPa平均值/MPa备注
第1组0.48381.7373.4377.55堵头
第2组0.54288.4280.4284.40-
第3组0.51240.7253.7247.20-
第4组0.53272.3285.4278.55-
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