The Research of Super-Heavy CNC Machine Accuracy Reliability Based on Multi-Body Kinematics

2011 ◽  
Vol 211-212 ◽  
pp. 115-121 ◽  
Author(s):  
Zhan Qi Hu ◽  
Ya Fei Xie ◽  
Jin Chao Liu
Keyword(s):  
Machine Tools ◽  
Technical Problem ◽  
Cnc Machine Tools ◽  
Maintenance Period ◽  
Cnc Machine ◽  
Spatial Error ◽  
Machining Errors ◽  
Similar Product ◽  
Multi Body ◽  
Heavy Machine

In order to solve the key technical problem in maintenance and repairing of heavy CNC machine tools, the concept of precision reliability and its forecasting module are proposed. The method is especially used for researching of reliability of heavy machine tools of which the samples are not enough for statistical methods. Firstly, spatial error module is established for a type of super heavy mill &boring machine tool based on multy-body kinematics. Then, the effect of wearing amount of kinematic pair of machine tools on machining precision is researched. Therefore forecasting modules for maintenance period and premature wearing of heavy CNC machine tools are built up. The method proposed can be used in calculating for maintenance period of heavy machine tools, analyzing for source of machining errors, and optimal design for total life of CNC machine tools. It can also be used in research of reliability for similar product of single piece or small batch.

Fever Analysis and Engineering Applications of the Heavy Machine Tool's Main Bearing

2013 ◽  
Vol 690-693 ◽  
pp. 1983-1987
Author(s):  
Shui Sheng Chen ◽  
Shuang Qiang Li ◽  
Zhong Ping Hua ◽  
Chen Dai
Keyword(s):  
Machine Tools ◽  
Rolling Bearing ◽  
Cnc Machine Tools ◽  
Cnc Milling ◽  
Practical Application ◽  
Heavy Duty ◽  
Cnc Machine ◽  
Main Bearing ◽  
Main Method ◽  
Heavy Machine

Large heavy-duty CNC machine tools commonly used rolling bearing as Main bearing. This paper analyses the causes of Main bearing fever deeply, pointing out the mechanism of the bearing heating; combined with the practical application of the TK6926 landing CNC milling and borings main bearing, putting forward the main method to reduce the rolling bearing fever and achieved good results.

Study on the Thermal Errors of CNC Machine Tools

2012 ◽  
Vol 472-475 ◽  
pp. 2918-2921
Author(s):  
Hong Qi Luo ◽  
Yue Hua Lai
Keyword(s):  
Machine Tools ◽  
Thermal Deformation ◽  
Thermal Error ◽  
External Heat ◽  
Cnc Machining ◽  
Cnc Machine Tools ◽  
Heat Sources ◽  
Cnc Machine ◽  
Thermal Errors ◽  
Machining Errors

Thermal deformation is produced by heat sources in CNC machine tools. Thermal error is one of the main parts in CNC machining errors. The internal and external heat sources were introduced. The research status about thermal errors was analyzed, including identification of thermal sensitive points, precaution against thermal errors and error compensation. Finally, thermal error models were summarized and discussed.

scholarly journals Study of Machining of Gears with Regular and Modified Outline Using CNC Machine Tools

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2913
Author(s):  
Rafał Gołębski ◽  
Piotr Boral
Keyword(s):  
Machine Tools ◽  
Coordinate Measuring Machine ◽  
Optical Microscope ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Cnc Milling ◽  
Cnc Machine ◽  
Cylindrical Gears ◽  
Measuring Machine ◽  
Five Axis

Classic methods of machining cylindrical gears, such as hobbing or circumferential chiseling, require the use of expensive special machine tools and dedicated tools, which makes production unprofitable, especially in small and medium series. Today, special attention is paid to the technology of making gears using universal CNC (computer numerical control) machine tools with standard cheap tools. On the basis of the presented mathematical model, a software was developed to generate a code that controls a machine tool for machining cylindrical gears with straight and modified tooth line using the multipass method. Made of steel 16MnCr5, gear wheels with a straight tooth line and with a longitudinally modified convex-convex tooth line were machined on a five-axis CNC milling machine DMG MORI CMX50U, using solid carbide milling cutters (cylindrical and ball end) for processing. The manufactured gears were inspected on a ZEISS coordinate measuring machine, using the software Gear Pro Involute. The conformity of the outline, the tooth line, and the gear pitch were assessed. The side surfaces of the teeth after machining according to the planned strategy were also assessed; the tests were carried out using the optical microscope Alicona Infinite Focus G5 and the contact profilographometer Taylor Hobson, Talysurf 120. The presented method is able to provide a very good quality of machined gears in relation to competing methods. The great advantage of this method is the use of a tool that is not geometrically related to the shape of the machined gear profile, which allows the production of cylindrical gears with a tooth and profile line other than the standard.

Toolholder/Spindle Interfaces for CNC Machine Tools

CIRP Annals ◽  
1995 ◽  
Vol 44 (1) ◽  
pp. 383-387 ◽  
Author(s):  
J. Agapiou ◽  
E. Rivin ◽  
C. Xie
Keyword(s):  
Machine Tools ◽  
Cnc Machine Tools ◽  
Cnc Machine
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