Error Compensation in One-Point Inclined-Axis Nanogrinding Mode for Small Aspheric Mould

2010 ◽  
Vol 97-101 ◽  
pp. 4206-4212 ◽  
Author(s):  
Shao Hui Yin ◽  
Feng Jun Chen ◽  
Yu Wang ◽  
Yu Feng Fan ◽  
Yong Jian Zhu ◽  
...  
Keyword(s):  
Error Compensation ◽  
Single Point ◽  
Ground Surface ◽  
Compensation Method ◽  
Grinding Wheel ◽  
Form Error ◽  
Profile Data ◽  
Profile Error ◽  
Form Accuracy ◽  
Setting Error

A compensation method was proposed for correcting wheel setting error and residual form error in nanogrinding of axisymmetric surfaces. In this method, profile data from on-machine measurement were used to obtain the setting error of grinding wheel, as well as the normal residual form error. Compensation model of single-point inclined-axis grinding was built up for generating new compensation path. Grinding test of aspheric tungsten carbide mould was conducted to evaluate performances of the compensation method. A profile error of 182 nm (peak to valley) and average surface roughness of 1.71 nm were achieved. These results indicated that the form error compensation method may significantly improve form accuracy of ground surface.

Form error compensation in single-point inclined axis nanogrinding for small aspheric insert

2012 ◽  
Vol 65 (1-4) ◽  
pp. 433-441 ◽  
Author(s):  
Fengjun Chen ◽  
Shaohui Yin ◽  
Hitoshi Ohmori ◽  
Jianwu Yu
Keyword(s):  
Error Compensation ◽  
Single Point ◽  
Form Error

scholarly journals General Tool Setting Error Compensation Method for 5-axis Control Ultraprecision Machining

2007 ◽  
Vol 73 (10) ◽  
pp. 1154-1158 ◽  
Author(s):  
Makoto SONO ◽  
Tohru ISHIDA ◽  
Koji TERAMOTO ◽  
Toshiyuki ENOMOTO ◽  
Yoshimi TAKEUCHI
Keyword(s):  
Error Compensation ◽  
Compensation Method ◽  
Ultraprecision Machining ◽  
Tool Setting ◽  
Setting Error ◽  
General Tool

scholarly journals Improvement of the Form Accuracy of a Slender Workpiece in Cylindrical Traverse Grinding

2019 ◽  
Vol 13 (6) ◽  
pp. 728-735
Author(s):  
Takashi Onishi ◽  
Teppei Takashima ◽  
Moriaki Sakakura ◽  
Koichi Sakamoto ◽  
Kazuhito Ohashi ◽  
...  
Keyword(s):  
Elastic Deformation ◽  
Cycle Time ◽  
Traverse Speed ◽  
Grinding Force ◽  
Wheel Speed ◽  
Grinding Wheel ◽  
Form Error ◽  
Form Accuracy ◽  
Peripheral Speed ◽  
Traverse Grinding

During the cylindrical traverse grinding of a slender workpiece, the ground workpiece is easily bent by the normal grinding force owing to its low stiffness. Therefore, it is difficult to finish the slender workpiece with high accuracy. To prevent the elastic deformation of a workpiece during the grinding process, a steady rest is generally used. However, considerable skill of the worker is required to use a steady rest. Therefore, we developed a new traverse grinding method without any steady rest. In this method, the elastic deformation of a workpiece was kept constant by controlling the traverse speed of the workpiece. At the middle of the ground workpiece, where the elastic deformation increased easily, the traverse speed was slowed down. However, this method had a longer grinding cycle time because the average traverse speed decreased compared to that of the conventional method. To shorten the cycle time, the peripheral speed of the grinding wheel was increased to decrease the normal grinding force. Basic grinding experiments were carried out under several grinding conditions by changing the peripheral speed of the wheel. From these grinding experiments, it was confirmed that the normal grinding force and the form error of the ground workpiece decreased as the peripheral wheel speed increased. By using results obtained from basic experiments, grinding experiments involving changes in the traverse speed were carried out at two peripheral wheel speeds. The grinding cycle time was reduced successfully by increasing the peripheral wheel speed without an increment in the form error of the ground workpiece. Furthermore, a form error was observed at the end of the workpiece where the grinding wheel traveled away from the workpiece. The form error occurred because the normal grinding force decreased rapidly when the contact length between the workpiece and the wheel was decreased at the end of the workpiece. To prevent rapid changes in the normal grinding force, the traverse speed of the workpiece was increased at the end of the workpiece. By using this method, a ground workpiece with high form accuracy was obtained.

A Novel CAM System with X/Y/Z 3-Axis Machines for Large Scale Aspheric Lens Grinding

2010 ◽  
Vol 37-38 ◽  
pp. 23-31
Author(s):  
Xiang Yang Lei ◽  
Hao Huang ◽  
Shi Han Zhang ◽  
Jian Wang ◽  
Qiao Xu ◽  
...  
Keyword(s):  
Error Compensation ◽  
Large Scale ◽  
Grinding Wheel ◽  
Machining Accuracy ◽  
Form Error ◽  
Aspheric Lens ◽  
Geometry Model ◽  
Whole Process ◽  
Nc Program ◽  
The Stability

According to needs of aspheric lens grinding and measurement with X/Y/Z 3-axis grinding machines, a CAM system is designed and implemented. The system, based on the parallel grinding geometry model, has realized the function of grinding locus planning, form error compensation, NC program auto-generation, on-machine measurement, grinding wheel on-machine measurement, simulation and technical database. To verify the stability of this CAM system, experiments were performed with three independent machining experiments. The experimental results indicate that the system realized the whole process of aspheric grinding, and it improved the machining efficiency and automation. Especially, this system adopted on-machine form error compensation technology and improved the machining accuracy. By implementing the error compensation integrated in the CAM system, the surface form error of a 430mm×430mm aspheric lens is decreased from PV8.2µm to PV4.1µm. The grinding accuracy was improved 100%.

Ultrasonic Dressing of Grinding Wheel and Its Influence on Grinding Quality

2006 ◽  
Vol 304-305 ◽  
pp. 62-65 ◽  
Author(s):  
Feng Jiao ◽  
Bo Zhao ◽  
Xun Sheng Zhu ◽  
Q.T. Fan
Keyword(s):  
Surface Topography ◽  
Physical Model ◽  
Ultrasonic Vibration ◽  
Single Point ◽  
Ground Surface ◽  
Grinding Wheel ◽  
Grinding Process ◽  
Dressing Method

Being a key step in grinding process, dressing of grinding wheel influences the whole grinding results, especially grinding quality. Because of its good dressing effect, a new dressing method assisted by ultrasonic vibration attracted researchers’ attention. In this paper, on the basis of the researches on dressing with single-point diamond dresser, physical model of ultrasonic dressing of grinding wheel were established. According to the physical model and the SEM photos of grinding wheel’s surface topography, the mechanism of ultrasonic dressing was brought to light. Through contrast experiments, based on roughness and micro-feature of the ground surface, the influence of ultrasonic dressing on grinding quality was researched.

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