Forming Principle and Error Analysis of Ballscrew Manufactured by Cold Rolling

Abstract:

Cold rolling is an advanced splinterless processing method, which has been applied to process many parts, like spur gears, helical gears, spline shaft and ballscrew, etc. Ballscrew which determines the motion characteristics has been used as key transmission part of ballscrew pair. According to differential geometry and meshing theory, the mathematic model of ballscrew manufactured by cold rolling is built, and the normal section equation of ballscrew is derivated in this paper. The cold forming principle of ballscrew is investigated; the meshing model, the contact line and theoretical errors of the ballscrew are constructed. The objective moving laws between roller and workpiece are revealed by analyzing the meshing model and the contact line, the processing method of cold-rolling is considered as the generating method which can lay the foundation for roller design by analyzing forming principle. By analyzing the profile error and the error of the actual helix of the centrode of ball, the error generation causes are discovered, and the calculation methods of the profile error and the spiral error of ballscrew are proposed. By analyzing the error evolution and taking a certain type of ballscrew for example, the results indicate that the profile error is brought by roller designing, and the spiral error is caused by discontinuous contact.

• Periodical: Advanced Materials Research (Volume 670)
• Pages: 85-90
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.670.85
• Online since: March 2013
• Authors: X.Q. Wang, F.K. Cui, X.J. He, H.Y. Xu
• Keywords: Ballscrew, Cold Rolling, Forming Principle, Generating Method

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