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Non-circular piston CNC lathe design and control system

Author: QiuBiWen
Tutor: ZhangBingWei
School: Jiangsu University of Science and Technology
Course: Mechanical and Electronic Engineering
Keywords: Middle-convex and varying ellipse piston CNC lathe Linear motor Knife rest Turbo PMAC
CLC: TG519.1
Type: Master's thesis
Year: 2010
Downloads: 28
Quote: 0
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Abstract


Piston is one of the key parts of internal combustion engines, which directly determines the work performance of internal combustion engines. Middle-convex and varying ellipse piston turning is a special noncircular cross section, and its special molding surface brings difficulty for its design and processing. This becomes an important task in the researching domain of the piston.According to China’s processing status of the piston,diffent from tradition,this paper presents a design of the piston CNC lathe adopting inversion T-shape structure and using Pro/E to establish machine’s solid model. Make analysis of mechanical properties on tool holder and work platform by HyperWorks. In order to make the designed knife block structure of liner motor lightweight. In order to reduce inertia producing in the process of motor’s high speed reciprocating motion and follow error.Designed open CNC system structure based on TUBRO PMAC+PC. X-axis feed movement using servo motor and linear motor double-driven mechanism, realizing loop control through raster feedback; Z-axis feed motion with servo motor and ball screw drive; Adopting servo control, Spindle coordinates the turn of the spindle shaft angle and X-axis radial displacement by TUBRO PMAC controller; The linkage of X-axis and Z-axis can realize the piston convex surface processing. In contrast with the traditional hard profiling method, the method has the advantages of good flexibility, high processing efficiency and high degree of accuracy.The Open CNC system and softwae has been developed based on WINDOWS platform. Non-circular Pistons open CNC system software designed by the dynamic link library (PCOMM32) PMAC motion control card provided in the WINDOWS platform. The real-time control tasks were completed by PMAC. Software developments by visual c++ on PC focused on major some tasks of non-real-time control and achieve the NC system’s basic functions.According to the middle-convex and varying ellipse piston turning’s processing characteristics, we choose the TURBO PMAC‘s movements control of the turning axis. We make the piston turning experiments by date which is provided from piston manufacturer.It is far superior to the traditional aspects of the rotary motor + ball screw will be able to meet the requirements of the Pistons processing. Testing results show that the system has achieved the expected results of the design requirements.The conclusions studied is specially present for middle-convex and varying ellipse piston turning. Research has certain theoretical significance and an important value in the piston of China’s processing. what’s more, it also can be referenced for other noncircular cross section works.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metal cutting and machine tools > Turning and lathe ( lathe ) > Program control lathes and CNC lathes
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