Design and formation of workforce skills for machine tool assembly

CIRP Annals ◽  
2015 ◽  
Vol 64 (1) ◽  
pp. 459-462 ◽  
Author(s):  
Masahiko Mori ◽  
Keiichi Ota ◽  
Atsushi Matsubara ◽  
Hajime Mizuyama
Keyword(s):  
Machine Tool ◽  
Workforce Skills ◽  
Tool Assembly

A Structure Analysis Method for Machine Tools Based on Assembly Relationship

2010 ◽  
Vol 29-32 ◽  
pp. 2443-2448
Author(s):  
Dong Fang Hu ◽  
Yan Li ◽  
Jian Dong Shang
Keyword(s):  
Finite Element ◽  
Machine Tool ◽  
Machine Tools ◽  
Element Model ◽  
Joint Surface ◽  
Analysis Method ◽  
Element Analysis ◽  
Set Up ◽  
Relationship Of ◽  
Tool Assembly

Considering the nonlinear relationship of the joint surface between parts in machine tool assembly, a finite element analysis method based on assembly relationship is proposed. By this method, a finite element model is set up. Based on the analysis of experimental data, the result is close to the actual working conditions, which proves that this analysis method based on the machine tool assemble relationship is feasible and reliable

The Modeling and Prediction of Gravity Deformation in Precision Machine Tool Assembly

2013 ◽  
Author(s):  
Junkang Guo ◽  
Jun Hong ◽  
Xiaopan Wu ◽  
Mengxi Wang ◽  
Yan Feng
Keyword(s):  
Machine Tool ◽  
State Space ◽  
State Space Model ◽  
Variation Theory ◽  
Assembly Process ◽  
Motion Error ◽  
Space Model ◽  
Precision Machine ◽  
Variation Propagation ◽  
Tool Assembly

The variation propagation in mechanical assembly is an important topic in several research fields, such as computer aided tolerancing (CAT) and product quality control. Mathematical models and analysis methods have been developed to solve this practical problem. Tolerance analysis which is based on the rigid hypothesis can be used to simulate the mass manufacturing and assembly. The state space model and stream of variation theory are mainly applied in flexible part assembly. However, in precision machine tool assembly, both tolerance design and process planning critically impact the accuracy performance, mainly because of the fact that the gravity deformation, including the part deformation and the variation in the joint of two connecting parts, cannot be ignored in variation propagation analysis. In this paper, based on the new generation GPS (Geometrical Product Specification and Verification) standards, the verification and modeling of key characteristics variation due to gravity deformation of single part and adjacent parts are discussed. The accurate evaluation of position and orientation variation taking into account form errors and gravity deformation can be solved from this model by FEM. A mathematical model considering rail error, stiffness of bearings is introduced to simulate the motion error in gravity effect. Based on this work to more accurately calculate the variation propagation considering gravity impact, a state space model describing the assembly process of machine tools is proposed. Then, in any assembly process, the final accuracy can be predicted to find out whether the accuracy is out of design requirement. The validity of this method is verified by a simulation of the assembly of a precision horizontal machining center.

scholarly journals Analysis of Response Mechanism at Machine Tool Assembly Site

2014 ◽  
Vol 80 (9) ◽  
pp. 856-861
Author(s):  
Keiichi OTA ◽  
Atsushi MATSUBARA ◽  
Hajime MIZUYAMA
Keyword(s):  
Machine Tool ◽  
Response Mechanism ◽  
Assembly Site ◽  
Tool Assembly

The Analysis and Evaluation Method of Assembly Accuracy Reliability of Heavy Duty Machine Tool

2012 ◽  
Vol 500 ◽  
pp. 608-613 ◽  
Author(s):  
Feng Lan Cheng ◽  
Bin Jiang ◽  
Ying Li ◽  
Min Li Zheng
Keyword(s):  
Machine Tool ◽  
Evaluation Method ◽  
Influence Factors ◽  
Safety Margin ◽  
Assembly Process ◽  
Heavy Duty ◽  
Physical Constraint ◽  
Analysis And Evaluation ◽  
Assembly Accuracy ◽  
Tool Assembly

Geometry constraint and physical constraint change because the structure is complex, tonnage is large, and assembly load is complex on heavy duty machine tool, assembly relation is changed for repeated assembly, then, the assembly accuracy reproducibility and assembly accuracy retentivity decline, which results in the decrease of assembly reliability. According to this problem, the interaction of geometry constraint and physical constraint is discussed in this paper, the influence factors of assembly accuracy reproducibility and assembly accuracy retentivity are respectively analyzed, the establishing, demolition and re-establishing of assembly relation effects assembly accuracy reproducibility, and evolution of assembly relation with time effects assembly accuracy retentivity, which are respectively revealed. Using margin method to evaluate assembly accuracy reliability, the criterion and evaluation method of assembly accuracy reliability is proposed, in order to provide reliable and quantitative criterion for assembly process design, and reasonably set safety margin of geometry constraint and physical constraint, form reliable assembly process, realize that the assembly accuracy is controlled and improved by assembly.

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