Journal of Jilin University(Engineering and Technology Edition) ›› 2025, Vol. 55 ›› Issue (5): 1536-1543.doi: 10.13229/j.cnki.jdxbgxb.20240542

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Modeling of CNC machine tool line rail assembly accuracy and its control method

Zhi-feng LIU1(),Ji-min CHEN2,Ying LI2(),Yong-sheng ZHAO2,Xing YAN2,Fu-quan SUN2   

  1. 1.College of Mechanical and Aerospace Engineering，Jilin University，Changchun 130022，China
    2.School of Mechanical and Energy Engineering，Beijing University of Technology，Beijing 100124，China
  • Received:2024-05-16 Online:2025-05-01 Published:2025-07-18
  • Contact: Ying LI E-mail:lzf@bjut.edu.cn;li_ying@bjut.edu.cn

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Abstract:

Aiming at the linear guide assembly process， due to the preload load caused by the assembly deformation mechanism is not clear resulting in the guide assembly straightness is difficult to predict the problem. In this paper， based on the establishment of linear guide assembly deformation model， the ideal and actual conditions of the guide assembly deformation is discussed. Secondly， considering the influence of manufacturing error of the guide rail mounting surface on the guide rail assembly accuracy， it puts forward the integrated assembly deformation and manufacturing error of the guide rail assembly straightness error prediction model， and puts forward the control method of the guide rail assembly accuracy based on the assembly deformation and the inverse repair manufacturing error. Finally， the experimental bench is built and the accuracy of the theoretical model and accuracy control method is verified through experiments， and the results show that the straightness error of the guideway assembly is reduced by 64.5%.

Key words: mechanical manufacture and automation, assembly deformation, manufacturing error, cnc machine tools, linear guideways

CLC Number: 

  • TG95

Fig.1

Schematic diagram of linear guideway assembly"

Fig.2

Model of bed force analysis"

Fig.3

Assembly deformation when bolt preload is uniform"

Fig.4

Connection structure schematic and physical drawing"

Fig.5

Distribution of bolt preload at fixed tightening torque"

Fig.6

Assembly deformation when bolt preload is dispersed"

Fig.7

Measured data and fitted curves"

Fig.8

Straightness of guideway assembly considering manufacturing errors and assembly deformation"

Fig.9

Experiment table physical picture"

Fig.10

Bolt preload collection system"

Table 1

Bolt preload measurement results"

螺栓编号预紧力/kN螺栓编号预紧力/kN
129.5927.9
226.51029.4
328.01128.5
425.51226.5
526.01326.7
627.51428.75
725.51526.75
825.251627.0

Fig.11

Guideway assembly deformation prediction results"

Fig.12

Manufacturing error measurement of guideway mounting surfaces"

Fig.13

Straightness error curve of guideway mounting surface"

Fig.14

Ideal guideway mounting surface straightness curve and guideway assembly deformation curve"

Fig.15

Comparison of straightness of rail assembly before and after pre-trimming of rail mounting surface"

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