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Energies 2020, 13, 6586 11 of 26 of the cutter based on the theory of the forming milling envelope and obtained the contour of milling cutter by MATLAB. Li et al. [43] introduced parametric design method of cutter profile for screw rotor forming milling. The feasibility of cutter profiler was validated by realized the 3D simulation machining of the spiral groove by using AutoLISP language in AutoCAD 2004. In-depth study of the cutter profiler design, screw machining and geometric modeling was carried out by Zhang Lina, Lee Y S, et al. [44,45]. 2.4.3. Advanced Professional Screw Rotor Processing Equipment At present, the screw rotor processing method and the complete set of professional processing equipment and technology are mature. But its related equipment is mostly monopolized by the established industrial powers such as the US’s ROBBING&MYER, UK’s HOLROYD, Germany’s LEISTRITZ, Germany’s KAPP and Germany’s KLINGELNBERG [46,47]. British’s HOLROYD is a company with strong strength and a long history of screw manufacturing. The TG350E CNC screw grinder developed by HOLROYD can complete the machining of the rotor surface with high effective and high accurate, and the technical requirements of the operator are not high. The maximum statistical error of grinding machine is ±4 μm, and the error of the guide process is less than ±2 μm. TG350E CNC screw grinding machine consists of mechanical system, control system, grinding wheel dressing system, precision grinding system and online measurement system. The grinding machine can automatically check the alignment of the workpiece, the rotor feed into the line is correct and the alveolar positioning is accurate. It can also perform a tooth scan, online measurement of rotor diameter, depth, pitch and groove, and the real-time feedback of data to the control system, to ensure accurate and rapid modification of tooth shape. Kingelnberg of Germany is a professional thread grinding machine manufacturer. This company develops the HN35 series CNC screw rotor grinder, which is mainly composed of grinding wheel dressing system and precision grinding system. The grinding machine can directly and forcefully grind all kinds of different types of rotor without rough machining. Although there is an online measurement system, the machine tool can be used to evaluate the rotor grinding quality and the zero-position judgment with the p-series gear measurement center of the development. So, it can also meet the high precision machining requirements of the rotor. The KAPP-RJ59 CNC screw rotor grinder produced by KAPP of Germany. It is used to process the screw rotor with high-speed grinding of the Cubic Boron Nitride (CBN) grinding wheel, and the coarse grinding and fine grinding of the rotor by two pieces of forming grinding wheel at the same time. The surface of forming grinding wheel decorated with diamond particles. After abrasive grain abrasion and shedding, the coating needs to be reapplied. The rotors can be measured online by the measuring system configured on the machine. Its advanced design concept makes the machine machining rotor with high efficiency and precision. China Hanjiang Machine Tool Co., Ltd. exhibited SK7032 CNC screw rotor grinder with independent intellectual property rights in Nanjing, China CNC Machine Tool Show CCMT2010. However, SK7032 still adopts the process method of grinding wheel repair and screw rotor grinding separately. It is necessary to manually change cutter and calibration cutter repeatedly, and it does not have an online detection function. There is a large gap compared to the professional processing equipment of screw rotor, such as UK and Germany [48,49]. The performance comparison of screw rotor grinding machine of four companies is shown in Table 3.PDF Image | Development and Application of the Twin Screw Expander
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