外文翻譯-- 高平滑鋁合金橫切面磨（原文）

1、 HIGH SMOOTHNESS GRINDING OF ALUMINUM ALLOY WITH SURFACE TRAVERSE GRINDING ODAKI Toshimi 1, YASUI Heiji 2 and TOMITA Susumu 1 1 Dept. of Mechanical Engineering, Shounan Institute of Technology Nishi-Kaigan 1-1-25, Ts

2、ujido, Fujisawa, JAPAN 2 Dept. of Mechanical Engineering & Materials Science, Kumamoto University Kurokami 2-39-1, Kumamoto, JAPAN Abstract High smoothness machining of aluminum alloy has been increasingly becomin

3、g important. Generally aluminum alloy is finished smoothly by cutting with diamond tool. High smoothness grinding of aluminum alloy, however, has been strongly desired because of the difficulty of re-sharpening of dia

4、mond tool. In the report, the influence of surface traverse grinding conditions on high smoothness grinding of aluminum alloy is examined by the comparisons of the dressing and grinding characteristics. The experiment

5、are executed using the resinoid bonded diamond wheel of coarse grain size and two types of grinding fluids which are the two kinds of emulsion type, that is, the conventional emulsion type and the special emulsion type

6、 including the extreme pressure additives. From the results it is found that the characteristic obtained by using the special emulsion type is much better than the conventional emulsion type. Key words aluminum alloy,

7、high quality component, high smoothness grinding, surface roughness, traverse surface grinding, diamond wheel, coarse grain size, grinding fluid, extreme pressure additives 1 INTRODUCTION Aluminum alloy is used a lot o

8、f field in industries. Recently the productively high smoothness machining technique has been strongly required because of the increase of demand of its high quality VgGrinding wheelCutting edgeWorkpiece vwp：Parallel ta

9、ble speedFig.1 Traverse grinding method with horizontal type surface grinder Fig.2 Composite wheel cross-section roughness normal to grinding direction formed by composing the outmost peripheral wheel surface at ea

10、ch wheel axis cross-sectionsurface roughness” because the normal surface roughness is so larger than the surface roughness parallel to grinding direction. The surface roughness is obtained by averaging 9 measuring point

11、s. The state of cutting edge and loading on wheel surface is observed by a microscope. Grinding force is measured by a piezoelectric type of dynamometer. 4 INFLUENCE OF DRESSING FLUIDS ON DRESSING EFFICIENCY In the us

12、ual grinding operation, the dressing fluid is generally the same as grinding fluid used just after dressing. Then, first of all, the influence of dressing fluid on the formation of wheel surface is examined. Fig.4 s

13、hows the change of the height of cutting edge appeared from the bond surface with dressing volume of WA stick for two types of dressing fluids, that is, the EC type and the ES type. It is clear that the height using

14、 the ES type is higher at the same dressing volume than the EC type. Extreme pressure additives have good influence on the removal of bond. The reason is considered why the extreme pressure additives prevent the loa

15、ding caused from the re-adhesion to wheel surface of bond removed by dressing[2]. 5 CHANGE OF SURFACE ROUGHNESS WITH GRINDING PASSES Fig.5 shows the change of surface roughness with grinding passes for grinding

16、 fluid types of the EC type and ES type. The grinding experiments are begun after the wheel surface is dressed by the same type of dressing fluid as grinding fluid until the height of cutting edge from the bond surf

17、ace becomes about 10µm. It is clear from the results that the surface roughness using the ES type becomes over two times rougher than the ES type. The surface roughness using the ES type is kept almost the sa

18、me of 1µm (Rz) until 100 grinding passes. Using the EC type, on the other hand, the surface roughness is about 2µm (Rz) at 60 grinding passes. From the results, it is considered that the wheel surface form

19、ed by dressing has great influence on the ground surface roughness. The extreme pressure additives are referred to have good effect on the formation of proper wheel surface[3]. Furthermore, the surface roughness usi

20、ng the EC type begins to become steeply larger with the increase of grinding passes in the range of grinding passes beyond 60 passes. 510152025300 1 2 3 4 5 6 7Dressing volume of W Astick Mv×10mm3Vd：20m/s td：1mm

21、vwp：0.1m/minW A150H：ES type：EC typeFig.4 Change of the top height of cutting edge appeared from the bond surface with dressing volume for two types of dressing fluids ：ES type：EC typeVg：20m/s tg：1µm vwp：10m/min fn

22、：0.25mm/pass1230 20 40 60 80 100Grinding passes NgFig.5 Change of surface roughness with grinding passes for grinding fluids of the EC type and the ES type process for grinding fluids of the EC type and the ES type.