Development On High Speed And High Precision Double-sided NC Drilling Machine Tool For Micro-deep Holes And Related Technology Research

The topic aim at processing of small mechanical parts in watch, especially drilling processing of micro-deep hole, develop special machine tools and carry out related technology research. Metal bracelet of watches commonly made of stainless steel, titanium alloy and other materials. Due to the difficulty in machining and complex shape of the workpiece, at the same time in order to save costs, the current domestic processing enterprises are still in the traditional machine tool and fixture machining method. With this approach, processing efficiency is low, the labor intensity of workers, parts processing quality is not stable, and processing cost in the rapid increase of faults. To change this unfavorable situation, watch parts processing enterprises are eager to find effective solutions. According to the needs of the development of industry, combined processing requirements of processing object, this study design two special machine tools layout schemes on the basis on different processing procedure. Parts for sequential feeding, in a serial processing methods is processed separately in each station, and parts for sequential feeding, but a parallel processing way processed at the same time in each station. By comparing with indicators of technical and economic, select the parallel processing way for layout scheme of machine tools.On the basis of the parallel processing way, this topic do the structure design of high speed and high precision double-sided NC drilling machine tool for micro-deep holes, conduct research on the related technology involved in scheme adopted by special machine tool, and the emphasis is the multi-station high-speed and high-precision horizontal rotary table parts. Therefore design a servo test bench, completed it’s mechanical and electrical engineering design, manufacturing inputs, and finished installation and commissioning. In order to simulate dedicated the workbench of special machine tools in the machining conditions, the drive control experiments are conducted on test bench, obtained the relevant data and practical experience, for the design and improvement of NC double-sided drilling machine parts design related to provide reference basis. From scheme design for special machine tools and complete development of test bench, mainly in the following specific tasks:1、According to the characteristics of stainless steel material difficult to machine, and based on the data collection and analysis, identified the difficulty in processing of processing object in this topic, designed the serial processing methods and parallel processing methods two kinds of processing schemes. Starting from indicators of technical and economic performance, do screening of two schemes, chose the parallel processing scheme as the optimal design scheme, and initially completed the machine tools design.2、Carried out two drilling experiments on stainless steel with cobalt high speed steel and hard-metal bits, got the processing effect of the work-piece in different processing parameters, and according to the experimental data fitting an experiential formula to the hard-metal bit in the diameter of1.2mm, and accordingly completed machine tool axis motion and dynamic components of the design.3、According to key technical indicators of multi-station rotary table in parallel processing method, designed the relevant test bench. Completed all mechanical design of the test bench and drawing production, the selection of related purchased parts, and the electrical control system design.4、Carried out servo control experiments on the test bench, make an examination of the performance of the test bench control parameters.