Analysis of Kinematic Motion Deviations of Rotary Tables Based on Geometric Tolerances

Among current approaches to tolerance analysis in three-dimensional space, the Matrix method based on rigid body kinemat ics is widely used. However, this method ignores the impact a tolerance feature (TF) may get fro m the variat ions of TFs before it , therefore showing its demerits when applied to long and comp lex dimension chains. For this reason, this paper puts forward a new tolerance analysis model where t wo local coordinate systems are built at each TF: a nominal one based on the datum of cu rrent TF and a tracking one based on the variations of the prior TFs. Then the variations of all TFs along the dimension chain are accumulated. Co mpared with the Matrix method, the new approach generates results with more accuracy and higher efficiency.

Section: Establishment Of Tracking Coordinate Systemsmentioning

confidence: 99%

A new approach to tolerance analysis based on tracking local coordinate systems

Zhai

Wang

et al. 2017

“…A systematic method was proposed by considering the priority among the guide-ways to determine the relative positions of the tables against the base. The followings summarize the models of the rotary tables and the linear tables (Satonaka, et al, 2008;Sugimura, et al,2012).…”

Section: Kinematic Motions and Deviations Of Rotary Tables And Linearmentioning

confidence: 99%

“…In the previous papers (Satonaka, et al, 2007;Satonaka, et al, 2008), a model has been proposed to represent the kinematic motion deviations of the linear tables, and the proposed model has been applied to the analysis of the standard deviations of the shape generation motions of the three-axis machining centers. The models of the tow-axis rotary tables have also been proposed, and Atsushi TAKAHASHI*, Arata YOSHIDA*, Wiroj THASANA* Nobuhiro SUGIMURA*, Koji IWAMURA* and Yoshitaka TANIMIZU* applied to the estimation of the standard deviations of the rotary motions (Sugimura, et al, 2012). The issues discussed in the paper are summarized in the followings.…”

Section: Introductionmentioning

confidence: 99%

Analysis of kinematic motion deviations of machining centers based on geometric tolerances

Takahashi

Yoshida

Thasana

et al. 2014

Self Cite

The objectives of the present research are to investigate relationships between kinematic motion deviations of machine tools and geometric tolerances of their components, to propose mathematical models representing kinematic motion deviations of five-axis machining centers, and to apply the models to analysis of the kinematic motion deviations of five-axis machining centers. A set of models is proposed to represent kinematic motion deviations of both the linear tables and the rotary tables, based on the geometric tolerances of the guide-ways connecting the components. By combing the models, three models of the five-axis machining centers are developed and applied to the analysis of the standard deviations of the shape generation motions of the tools and the workpieces. The proposed models provides us with a systematic method to analyze and to estimate the kinematic motion deviations of the five-axis machining centers, based on the geometric tolerances of the guide-ways connecting the components.

“…Some researches have been carried out for the investigation of the machining processes based on the kinematic motion deviations between the tools and the workpieces (Sugimura et al 2012). Li et al (2008) conducted a survey of the off-line optimization on CNC machining based on the virtual machining and also discussed about the machining error compensation.…”

Section: Introductionmentioning

confidence: 99%

A study on estimation of 3-dimensional surface roughness of boring processes including kinematic motion deviations

Thasana

Sugimura

Iwamura

et al. 2014

Self Cite

The surface roughness is one of the most important characteristics of machined parts. A systematic method is proposed in the paper to simulate the shape generation processes in the boring operations and to estimate the surface roughness of the generated faces, based on the machining parameters. The simulation model includes both the models of the shape generation motions considering kinematic motion deviations and the cutting tool geometries. The shape generation motions with deviations are mathematically described by 4 by 4 transformation matrices. A set of points on the bored holes are generated through the simulations, and an assessment surface is obtained as the datum reference to estimate the 2-dimensional (2D) and the 3-dimensional (3D) surface roughness, based on the points generated by the boring process simulations. The proposed method provides us with a systematic method to estimate the surface roughness in the boring processes including the kinematic motion deviations.