【文章內(nèi)容簡介】 l be used to enhance modeling accuracy. Without the inprocess form error measurement (Figs. 1 and 2),the workpiece has to be removed from the machining position to measure of?ine to obtain the initial workpiece pro?le y0(x,z). A signi?cant amount of error was caused as the workpiece has to be mounted again after the of?ine measurement (Huang and Gao,2021). This is particularly true for nonferrous materials such as Al,Cu, and Si which are monly used where magic chuck will no longer be functional. . Prototype To avoid the scratch problem in the contact approach (Whitehouse, 2021), a new optical inprocess surface form measurement prototype system has been developed and has been used on a real surface grinding machine (Fig. 2) (Gao et al., 2021, 2021).The measurement system is mainly made up of a triangular laser sensor, applicator and air piece. The type of the laser sensor is Cyber Optics DRS300. It has a resolution of 50 nm and is used to measure workpiece surface form pro?le yn(x,z) (Figs. 1 and 2). The applicator is for reducing the amount of coolant near the measurement region (Fig. 2). This will be bene?cial for establishing a transparent window for optical measurement. The air piece is to allow an air beam to be ejected and then impinged on the workpiece surface to remove coolant. The system is the ?rst one of the type for workpiece form pro?le measurement for which the coolant problem that prevents use of high precision optical approach was solved (Gao et al., 2021). . Opaque barrier and vibration Due to two key problems, which are opaque barrier and vibration (Gao et al., 2021), the study of inprocess form error optical measurement for precision machining has been a hard topic requiring intensive and extensive study. Another problem is the inherence access 濟南大學畢業(yè) 論文 外文資料翻譯 5 problem (Marinescu et al., 2021). So far very few existing research works can be found, although there are many existing optical approaches for roughness measurement since 1980s, all not being able to deal with the two key problems, in particular, the opaque barrier problem. The proposed new measurement system (Gao et al., 2021) is able to deal with the two key problems. This allows high precision inprocess surface form pro?le measurement without the scratch problem (Whitehouse, 2021) on a real grinding machine (Gao et al.,2021) (Fig. 2). Further studies are planned for developing a better system ready for wide industrial use (Gao et al., 2021). Research of the kind is much needed prior to industrial application. Intensive characteristics and optimization study should be good in order to deliver a technology ready for real industrial use. It is noted that many lower precision and contact stylus type(Whitehouse, 2021) inprocess sensors have been used in industry(Gao, 1998) for many years. Using high precision and noncontact optical sensors (Gao et al., 2021) is surely a good direction to move forward. . Repeatability The measured pro?le and corresponding position information yn(x,z) are both collected by a PC (Gao et al., 2021, 2021). Techniques such as damping and moving average have been applied in this system to reduce measurement error (Gao et al.,2021, 2021).A measurement error of m was achieved in the tests on a grinding machine (Gao et al., 2021, 2021). 3. Model of partial removal condition In surface grinding, due to initial surface pro?le error and misalignment involved in workpiece and workpiece mounting, machining usually begins with partial removal of workpiece surface (Fig. 1). This is a mon problem in surface grinding. The problem was experienced in our previous modeling study (Huang and Gao, 2021) and signi?cant amount of error was found in prediction of form accuracy in the machining process (Huang and Gao,2021). . Partial removal Partial removal means material removal occurs only at part of a grinding path along the x direction (Fig. 1). For the remaining part of the grinding path, there is no engagement between wheel and workpiece. After a number of grinding passes, partial removal is to be followed by a stage of full removal, where the grinding wheel and the workpiece are engaged through out a grinding pass. . Partial removal condition To study the partial removal stage, a new model of size reduction condition is proposed. A general size reduction model