scholarly journals Traverse grinding of low-stiffness shafts with the use of a grinding wheel’s path correction

Mechanik ◽  
2018 ◽  
Vol 91 (8-9) ◽  
pp. 741-743
Author(s):  
Jan Burek ◽  
Paweł Sułkowicz ◽  
Robert Babiarz
Keyword(s):  
Force Measurement ◽  
Dimensional Accuracy ◽  
Grinding Force ◽  
Grinding Process ◽  
Shape Errors ◽  
Low Stiffness ◽  
Traverse Grinding

This paper presents a method of increasing the shape and dimensional accuracy of low-stiffness shafts manufactured in traverse grinding process. In order to achieve that, grinding force measurement was used. It allowed to calculate such a correction of a grinding wheel’s path, that allowed to decrease dimensional and shape errors of grinded workpieces.

Study on the Shape Error in the Cylindrical Traverse Grinding of a Workpiece with High Aspect Ratio

2014 ◽  
Vol 1017 ◽  
pp. 78-81
Author(s):  
Takashi Onishi ◽  
Takuya Kodani ◽  
Kazuhito Ohashi ◽  
Moriaki Sakakura ◽  
Shinya Tsukamoto
Keyword(s):  
Aspect Ratio ◽  
Elastic Deformation ◽  
High Aspect Ratio ◽  
Grinding Force ◽  
Grinding Process ◽  
Shape Error ◽  
Shape Accuracy ◽  
Low Stiffness ◽  
Traverse Grinding ◽  
Main Factor

In cylindrical traverse grinding of a long workpiece with high aspect ratio, the shape accuracy of a workpiece worsens due to its low stiffness. In this study, the grinding force was measured during grinding process to calculate the elastic deformation of a workpiece caused by the normal grinding force. By comparing calculated elastic deformation with the measured shape error of ground workpiece, the cause for the shape error in case of grinding a long workpiece was investigated experimentally. From experimental results, it is confirmed that the main factor of the shape error of the long workpiece is its elastic deformation during grinding process.

scholarly journals Cylindricity error measurement and compensation in traverse grinding of low-stiffness shafts

Mechanik ◽  
2018 ◽  
Vol 91 (11) ◽  
pp. 970-972
Author(s):  
Jan Burek ◽  
Paweł Sułkowicz ◽  
Robert Babiarz
Keyword(s):  
Elastic Deformation ◽  
Force Measurement ◽  
Grinding Force ◽  
Grinding Wheel ◽  
Error Measurement ◽  
Low Stiffness ◽  
Grinding Machine ◽  
Cylindricity Error ◽  
Traverse Grinding

This paper presents a system of measurement and compensation of cylindricity error in low-stiffness shafts grinding. A programme, that generates the path of a grinding wheel taking into account the elastic deformation of the shaft and grinding machine on the basis of the grinding force measurement was developed

Effect of Steady Rest in Cylindrical Traverse Grinding of Slender Workpiece

2020 ◽  
Author(s):  
Hidetaka Fujii ◽  
Takashi Onishi ◽  
Chinhu Lin ◽  
Moriaki Sakakura ◽  
Kazuhito Ohashi
Keyword(s):  
Elastic Deformation ◽  
Contact Point ◽  
Traverse Speed ◽  
Grinding Force ◽  
New Method ◽  
Beam Model ◽  
Shape Error ◽  
Form Error ◽  
Low Stiffness ◽  
Traverse Grinding

Abstract In the case of traverse grinding of a slender workpiece, the ground workpiece is easily deformed by the normal grinding force due to its low stiffness. To reduce the form error caused by the elastic deformation of the workpiece, a steady rest is widely used. Generally, a steady rest is set to push the ground area of the workpiece. However, the stepped shape error is generated at the contact point where a steady rest pushed the workpiece because the pushing force of a steady rest is decreased after the material of the contact point is removed. In this study, to reduce the stepped shape error of the ground workpiece, we proposed a new method to set a steady rest. In this method, the steady rest was set to push the area where was not ground. In addition, the traverse speed of the workpiece was adjusted to keep the elastic deformation of the workpiece constant. The suitable method to control the traverse speed was estimated by using a beam model that could simulate the elastic deformation of the workpiece during the grinding process. It was confirmed that the new method could improve the form accuracy of a slender workpiece through grinding experiments.

Experimental Studies on Grinding of Titanium Alloy with SG Wheels

2007 ◽  
Vol 329 ◽  
pp. 75-80 ◽  
Author(s):  
H.X. Zhang ◽  
Wu Yi Chen ◽  
Z.T. Chen
Keyword(s):  
Titanium Alloy ◽  
Experimental Studies ◽  
Dimensional Accuracy ◽  
Grinding Force ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Wheel Wear ◽  
Grinding Wheel Wear ◽  
Conventional Grinding ◽  
Abrasive Tools

The grinding process has been investigated in the machining of titanium alloy with conventional grinding wheel and SG grinding wheel respectively. The machinability discussed here includes grinding force, surface roughness, dimensional accuracy, grinding ratio, grinding-wheel wear and grinding-wheel life. The SG grinding wheel is found to possess particularly good grinding properties and is more suitable for grinding titanium alloy when compared with conventional abrasive tools.

Static Properties Research of Grinding Dynamometer for Wafer Grinder

2012 ◽  
Vol 565 ◽  
pp. 603-608 ◽  
Author(s):  
Jun Zhang ◽  
Yin Bai ◽  
Min Qian
Keyword(s):  
Mathematical Model ◽  
Force Measurement ◽  
Grinding Force ◽  
Grinding Process ◽  
Static Properties ◽  
Static Tests ◽  
Static Calibration ◽  
Ultra Precision ◽  
On Line ◽  
The Mathematical Model

Grinding force is strongly related to grinding process, and the application of dynamometer for its measurement during machining is essential for investigating, monitoring and optimizing the grinding process. This paper presents an innovative dynamometer for triaxial grinding force measurement, specifically designed for an ultra-precision grinder. Two different kinds of spatial arrangements are discussed, including lozenge and square arrangement. The mathematical model is established and calculated. Furthermore, a series of static calibration tests have been conducted for the dynamometer, and static properties of the grinding area are also measured and analyzed. Eventually, on-line static tests of the dynamometer installed in silicon wafer grinder are performed. The results show that the grinding dynamometer has excellent properties, which reach the CIRP standards and meet the working requirements of the ultra-precision grinder.

scholarly journals Study on the Effect of Grinding Pressure on Material Removal Behavior Performed on a Self-Designed Passive Grinding Simulator

2021 ◽  
Vol 11 (9) ◽  
pp. 4128
Author(s):  
Peng-Zhan Liu ◽  
Wen-Jun Zou ◽  
Jin Peng ◽  
Xu-Dong Song ◽  
Fu-Ren Xiao
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Service Life ◽  
Material Removal ◽  
Removal Rate ◽  
Grinding Force ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Grinding Temperature ◽  
Grinding Efficiency

Passive grinding is a new rail grinding strategy. In this work, the influence of grinding pressure on the removal behaviors of rail material in passive grinding was investigated by using a self-designed passive grinding simulator. Meanwhile, the surface morphology of the rail and grinding wheel were observed, and the grinding force and temperature were measured during the experiment. Results show that the increase of grinding pressure leads to the rise of rail removal rate, i.e., grinding efficiency, surface roughness, residual stress, grinding force and grinding temperature. Inversely, the enhancement of grinding pressure and grinding force will reduce the grinding ratio, which indicates that service life of grinding wheel decreases. The debris presents dissimilar morphology under different grinding pressure, which reflects the distinction in grinding process. Therefore, for rail passive grinding, the appropriate grinding pressure should be selected to balance the grinding quality and the use of grinding wheel.

In situ wireless measurement of grinding force in silicon wafer self-rotating grinding process

2021 ◽  
Vol 154 ◽  
pp. 107550
Author(s):  
Fei Qin ◽  
Lixiang Zhang ◽  
Pei Chen ◽  
Tong An ◽  
Yanwei Dai ◽  
...  
Keyword(s):  
Silicon Wafer ◽  
Grinding Force ◽  
Grinding Process ◽  
Wireless Measurement

Grinding Force Model for Low-Speed Grinding Based on Impact Principle

2013 ◽  
Vol 797 ◽  
pp. 123-128
Author(s):  
Ming He Liu ◽  
Xiu Ming Zhang ◽  
Shi Chao Xiu
Keyword(s):  
Sliding Friction ◽  
Impact Load ◽  
Grinding Force ◽  
Calculation Model ◽  
Force Model ◽  
Grinding Process ◽  
Low Speed ◽  
Impact Area ◽  
Force Mechanism ◽  
The Impact

In the low-speed grinding process, the force generated when the wheel grinding the workpiece is the result of sliding friction, plough and cutting. While in the actual study, the cutting process has attracted extensive attention. Impact effect to the entire grinding process on the contact is ignored so that the error exists between the calculation grinding force and the measured grinding force. Basing on the shock effect to the grinding process, the paper divides the contact area into impact area and cutting area. And the model of impact load generated from single grit is built. Moreover, the grinding force theoretical calculation model and total grinding force mathematical model is also constructed by analyzing the impact load affecting on the grinding force mechanism. Finally experimental study verifies the correctness of theoretical analysis.

The Control of Multi-Bending: A Flexible Method to Fabricate Complex Structural Parts

1994 ◽  
Author(s):  
Jack X. Luo ◽  
Kim A. Stelson
Keyword(s):  
Process Model ◽  
Transfer Functions ◽  
Control Method ◽  
Dimensional Accuracy ◽  
High Productivity ◽  
Bending Process ◽  
Shape Errors ◽  
Complex Structural ◽  
Structural Parts ◽  
Machine Operator

Abstract The CNC multi-axis bending process can achieve high productivity and flexibility over conventional forming processes for fabricating long slender structural components of arbitrary shape. However, generating a CNC program to produce an accurate part shape is currently a laborious procedure involving trial-and-error by the machine operator. A systematic method has been developed to replace the manual control method and increase the dimensional accuracy. The concept of an intrinsic representation from differential geometry is applied as a basis to represent the part shape and develop the process model. The feedback control is derived from two transfer functions that represent the bending and twisting processes. By applying shape errors to the inverse transfer functions, incremental control commands can be determined and used to improve the control performance. Experimental results have demonstrated that shape errors decrease on subsequent iterations.

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