High-speed machining is a high-tech for the 21st century. It is characterized by high efficiency, high precision and high surface quality. It has gained more and more in the automotive industry, aerospace, mold manufacturing and instrumentation industries. Wide application, and has achieved significant technical and economic benefits, is an important part of contemporary advanced manufacturing technology.
High Speed Machining <br> <br> technical features to achieve high-speed cutting efficiency of the manufacturing technology of the core, and a universal equipment intensive process so that it has high production efficiency. It can be said that high-speed machining is an indispensable technology that greatly increases the machining efficiency without increasing the number of devices. Its technical characteristics are mainly reflected in the following aspects:
1) The cutting speed is very high, and it is generally considered to be 5 to 10 times faster than ordinary cutting:
2) The spindle speed of the machine tool is very high, generally the spindle speed is above 10000~20000r/min;
3) The feed rate is very high, usually 15~50m/min, up to 90m/min
4) For different cutting materials and tool materials used, the meaning of high-speed cutting is not the same;
5) During the cutting process, the Tooth Passing Freqnency is close to the Dominant Natural Frequency of the “Machine-Tool-Work†system.
In 1992, Professor H. Schulz of the Technical University of Darmstadt in Germany proposed the concept of High Speed ​​Manufacturing (HSM) and its coverage on CIRP, as shown in Figure 1. It is considered that for a different cutting object, the transition shown in the drawing is a so-called high-speed cutting range, which is also a cutting speed that is expected or expected by a metal cutting process-related technician.
Compared with conventional machining, high-speed cutting significantly increases the cutting speed, resulting in increased friction between the workpiece and the rake face and an increase in the temperature of the chip and tool contact surfaces. At this point of contact, the high temperature brought by the friction can reach the melting point of the workpiece material, making the chips soft or even liquefied, thus greatly reducing the resistance to the cutting tool, that is, reducing the cutting force, making the cutting light, chipping The production is smoother. At the same time, 70% to 80% of the heat generated by the processing is concentrated on the chips, and the removal speed of the chips is fast, so the heat transferred to the workpiece is greatly reduced, and the machining accuracy is improved. The advantages of high-speed machining technology are mainly: to improve production efficiency; to improve machining accuracy and surface quality; and to reduce cutting resistance.
High-speed machining applications in the automotive industry before <br> <br> material to be removed to a large workpiece, or a workpiece having a complicated structure (e.g., engine block, cylinder head, etc. automobile panel dies) the unitary structure, Conventionally, workpieces that require considerable length of maneuvering work, as well as workpieces with fast design changes and short product cycles, can show the advantages of high-speed cutting. The following is a description of high-speed machining of automotive engines and automotive parts and cover parts.
1. High-speed machining of automotive engines and their accessories FTL: High-speed machining centers are used to form high-efficiency flexible production lines (FTL), which are characterized by miniaturization, flexibility, and easy change of processing content. Figure 2 shows an example of an engine company used by the SAIC Group to process workpieces such as engine blocks, cylinder heads, and filter holders.
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