Search

Your search keyword '"Liu Runai"' showing total 8 results
Start Over Author "Liu Runai"
8 results on '"Liu Runai"'

4. Experimental study on ultra-precision grinding characteristics of WC-Ni hard metals.

Author

Feng, Guang, Wang, Tao, Huang, Qingxue, Guo, Wenliang, and Liu, Runai

Abstract

Tungsten carbide (WC) hard metals are universally used in industrial fields owing to their superior properties, and the machining accuracy of WC products is playing an important role in their service performance. However, how to achieve a balance between high accuracy and processing cost according to different applications is a key engineering issue. Thus, it is necessary to reveal the material removal characteristics of such difficult-to-cut hard metals. In this article, ultra-precision grinding characteristics of WC-Ni hard metals were investigated based on the wafer rotation grinding method using #120, #600, #2000, and #12000 diamond cup wheels as coarse, semi-finished, fine, and finish grinding wheels, respectively. A polished sample was taken for comparison. The optical surface profilers, scanning electron microscope, and atomic force microscope were employed for checking surface topographies, surface morphology, and cutting depth. An ultra-smooth and defect-free WC-Ni surface with less than 2 nm Ra and the average cutting depth of about 10 nm can be obtained using a #2000 diamond wheel, which can replace polishing and satisfy the requirements of most high-performance applications. This study provides useful observations for ultra-precision manufacturing of hard metal products. [ABSTRACT FROM AUTHOR]

Published
2020
Full Text
View/download PDF

5. Modeling of Volumetric Error for CNC Gear Hobbing Machine Based on Multi-body System Theory

Author

Liu Runai, Zhang Gen-bao, and Lv Ming

Subjects
Hobbing, Engineering, business.product_category, Multi body, business.industry, Tooth surface, Mechanical engineering, Control engineering, Machine tool, Compensation (engineering), Volumetric error, Machining, Numerical control, business
Abstract

Based on the theory of multi-body system and the motion of CNC gear hobbing machine, a volumetric error model for NC gear hobbing machine has been built, and the tooth surface equation is established, which includes original position errors and motion errors. Thus a preferable method is provided for carrying out real-time measurement and compensation, and further studying the effects that error factor takes on gear machining.

Published
2011

6. Notice of Retraction: Research on key technologies of direct-drive gear hobbing machine of dry-cutting

Author

Liu Runai and Lv Ming

Subjects
Hobbing, Engineering, Worm drive, business.product_category, Non-circular gear, Gear cutting, Torque motor, Cutting tool, business.industry, Torque, business, Automotive engineering, Machine tool
Abstract

The development trend of gear hobbing machine which includes CNC, high-speed, high-accuracy, direct-drive and environment protection, is discussed firstly, and design principle of direct-drive gear hobbing machine of dry-cutting, which break through traditional structure design theory of gear cutting machine, is put forward. Direct-drive gear hobbing machine adopts the technologies of build-in motor spindle and DDR torque motor which directly drive the revolve of cutting tool and worktable, and completely cancels high precision gears and worm wheel in the machine transmission, so to realize that power source directly drive work parts of machine tool. The key technologies of direct-drive gear hobbing machine of dry-cutting, such as general layout technology, bed and chip removal system design technology, hob spindle and workpiece spindle structure design technology, are analyzed and studied in detail. It is of theoretic significance and practical value, for the study and development of direct drive gear-cutting machine of high-speed and high-precision.

Published
2010

Catalog

Books, media, physical & digital resources
See catalog results