Large circular hydrostatic guideway nc rotary table of research methods

Large nc rotary table circular blowing a research method in 2020 - hydrostatic guideway 03 - 02 Pan Shaogang DiaoJingLin liu yong Ming ( Yantai universal machine tool equipment co. , LTD. ) Large general nc rotary table with high bearing stiffness, high rotation accuracy, smooth operation of hydrostatic guideway, hydrostatic guideway of the oil film thickness in order to increase its rigidity, usually only 0. 03 ~ 0. 6 mm, so higher requirements to guide the processing precision. Currently, most hydrostatic guideway processing equipment cannot meet the accuracy requirement, and to research the processing method is used to ensure that commonly. This paper summed up through practice a circular guide of research methods. 1. Base hydrostatic guideway nc rotary table flatness measurement and adjustment of large nc rotary table base length of 2 m or more commonly, the poor rigidity, before scraping research must be carried out on the guide rail flatness measurement and adjustment, reduce the research work. Measurement by tangential guide rail flatness measurement method, can according to the measured data, find out the guide rail is concave and convex point. As shown in figure 1, the base guide rail are can be divided into 12 areas, and make the serial number tag. Level block length is 400 mm, level accuracy is 0. 02mm/1000mm。 Guide to office take point as starting point of measurement, measurement for 12 areas in turn. In the mobile level pad iron, in a certain direction to move, don't put them back. Record every time reading. Abscissa is shown in figure 2, the establishment of coordinate system, the length of the guide rail, y coordinate for the level of the readings. Draw by superposition method in turn 12 readings on the coordinate system, with a straight line, the connection at various points in turn and the starting point and end point into a straight line. Then graphics rotate, the starting point and end point of attachment and O - The X1 axle load can be. Figure 2 in implementing lines for a turntable measured curve, the dotted line is measuring plane for ideal plane when the measured curve. Ideal curve equation is: the two curves do not contact ratio for the guide rail surface flatness, higher than the ideal curve for convex part of the below for the low-lying parts of the ideal curve. Can be seen from the figure 2, the biggest bump at 11 PM, for the largest amount raised: low point at 6:00 biggest, most low-lying is: so the error of the flatness is: 0. 056 + 0. 6 = 0. 116 mm, the shim down 11 points, six points of shim. Put the level in the corresponding position, according to the size of the data in the figure, by observing the change of the level reading, to control the shim adjustment degree. 2. Guide of scraping the inquiry table guide of machining accuracy is higher, basic meet the precision requirement, research work is smaller, the two guide rail is adopted to research the method. Alleged to research method, it is using the workbench in turn guide rail and bottom rail as a benchmark of rotary research point, for skiving repeatedly, until the one way to meet the accuracy requirements. Adopting this method must make two guide to study in the rotation has a good heart, so that the two high guide surface can always stay in touch, to bring out the scrape. In scraping the inquiry for the first time, if the flatness is very poor, according to the testing data of flatness, the high polished, first and then to grind. Workbench guide precision is better than the base guide rail, so start with the workbench guide as a benchmark to grind the base guide rail. First turn on the base of guide rail is divided into 12 areas, and in the scraping surface marking. Then on the base of guide rail TuHong lead powder, and the workbench in 40 & deg; Within the scope of rolled back twice. Lift workbench, observe the base guide rail contact pattern, the distribution of the contact spot and put each area, such as spots of sparse, weight and other detailed record, as shown in figure 3 a. Put the base to TuHong lead powder, compared to the last, the relative to the base table rotated 45 & deg; After installed on the base of the research, observe the base guide rail contact spot, and the distribution of records spots as above, as shown in figure 3 b. According to the distribution of the two spots, if in the same area at the same time have the contact pattern and hard spots, show the area is base at greater risk of guide rail high, scraping. Can be seen from figure 3 area 1, 2, 4, 5, 6, 9 and 10 have contact in twice to research spots, need for scraping. Point of contact with heavier, a little bit heavy grinding dynamics, point of contact is lighter, grinding strength slightly lighter. A spotted on the contrary, if the same area, no spots at a time, show the area is less likely that the base guide rail high, temporarily not scraping. Area 3, 7, 8, 11, 12 for research in twice, once there is contact spots, a no contact spot, so don't scraping. The base to TuHong lead powder, relative to the base table again turn 45 & deg; After loading on the base of research, repeat the research process. On the base of scraping four times, and then based on the base guide rail, scraping the inquiry table guide as above. Generally the workbench scraping the inquiry twice, and then to the workbench guide as a benchmark, to scratch the base guide rail. So repeated scraping on the workbench and the base research, until every time research points, points are reaching every 25 mm & in all areas of The Times; 25 mm within 4 ~ 6 points. 3. Conclusion in this paper, large hydrostatic guideway nc rotary table flatness detection and adjustment method, in order to reduce the magnitude of the scraping research guide. At the same time analyses the guide of research, through field test and production verification for many times, can meet the accuracy requirement of hydrostatic guideway. Source: the metal processing ( Cold working) , no. 4 in 2018