外文翻譯--cnc機(jī)器上自由形態(tài)表面非連絡(luò)自動機(jī)械測量-其他專業(yè)-資料下載頁
2025-01-19 09:49本頁面
【導(dǎo)讀】文的意義、概念描述基本符合漢語的習(xí)慣，語句較通暢，層次較清晰。形態(tài)的表面發(fā)展一個非連絡(luò)類型自動機(jī)械測量系統(tǒng)的工作。工程任何的市售CAD/CAM系統(tǒng)的轉(zhuǎn)換數(shù)據(jù)，通過正確的DXF文件,也是可得的。工件邊緣偵測方面,激光探測的系統(tǒng)精確方面已經(jīng)實(shí)現(xiàn)了。副本物體的形狀誤差，相對于它的樣品，不超過30微米，對于鑄型業(yè)應(yīng)該是足夠了。衡學(xué)的測定效率，已經(jīng)在工業(yè)中得到很大的改良。照慣例，大部分CMMs裝備有接觸。測量的程序在以上因素方面的確非常快而且可重復(fù)，因?yàn)橹恍枰綔y點(diǎn)的少數(shù)。數(shù)字，而且探測半徑的補(bǔ)償是相當(dāng)簡單的。被抽取樣品的位置因探測速度而影響，被抽取樣品的點(diǎn)可能不夠適當(dāng)來正確地表現(xiàn)標(biāo)準(zhǔn)的表面，探頭頂尖容易很快磨損，而且一些機(jī)械結(jié)構(gòu)和伺服控制器的誤差可能會發(fā)生。此外，在應(yīng)用這種探針到CNC型的CMM時，系統(tǒng)的測量精度和速。測器的傳感器頭。如果被測量物體移動,反射激光光斑也通過PSD. 所列出的反應(yīng)制造商所提供的任何特定的。所調(diào)查的激光探針，
【正文】 r probe, the measuring accuracy can be significantly improved if the master piece is coated with red paint. The influence of the surface roughness of the workpiece on the laser probe measurement had already been investigated previously. It was found that within the reasonable Ra values ( to 3 pm) of any machined surface, the calibrated results did not show significant changes as long as the optical plane of the laser probe was perpendicular to the surface lay. Since most of the workpieces to be measured must have been polished to certain small Ra values, this effect could therefore be neglected. 4. ENHANCEMENT OF EDGE DETECTION CAPABILITY OF LASER PROBE Most of the laser probes on the market only provide the function of displacement measurement. Although this function can make the technique of surface scanning measurement possible, the capability of most laser probes in the edge detection is still very poor nowadays. Some solutions, in this technology, will have to e about since any geometrical shape of the workpiece must have boundary. A method for this aspect is therefore proposed in this work. The investigated laser probe, Keyence LC2220 sensor head with LC2100 controller, has both digital and analog output ports. The digital port transmits its digital readouts to an external device via a RS232C or a GPIB interface. Meanwhile, the analog port sends a voltage value in proportion to the meter reading out to an external A/D converter. As the laser probe is ou of its measuring range, the invalid region, the digital readout (DRO) will appear a DARK signal and the analog port will output volts. As the laser probe is located within its valid region and at its reference distance to the surface, the analog signal will output zero volt. An initial experiment was carried out by setting the laser probe, on the 0MM, at its reference distance to a flat work surface. It was then moved in and out of the surface horizontally and repeatedly, as seen in Fig. 5. The voltage changes of the analog signals were observed by a digital oscilloscope. Fig. 6 shows a typical display of the voltage changes when crossing the sharp edge of the work surface. It was clearly seen that when moving the probe from the invalid region into the valid region across the sharp edge the output signal appeared an apparent time delay which was proportional to the feedrate. However, when moving the probe from the valid region to the invalid region the output signal responded immediately at the edge position. This phenomenon is difficult to explain. Yet, the authors believe that it could be due to the triangulation principle of the laser probe. It, however, points out a feasible solution that the edge detection should always be done from the valid region to the invalid region. Another important factor should also be pointed out here that, during motion the optical plane must be perpendicular to the surface lay, otherwise the light will be seriously scattered out. To verify this enhanced capability of the laser probe in the edge detection, dimensional measurements were carried out on a line and a circle separately. Fig. 7a and Fig. 7b show each proposed measuring path. Fig. 8a and Fig. 8b plot the measured results which are all quite consistent with the corresponding nominal dimensions.
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