Applied Machining Technology by Heinz Tschätsch

By Heinz Tschätsch

Machining and slicing applied sciences are nonetheless an important for lots of production approaches. This reference offers all very important machining tactics in a finished and coherent approach. It presents the working towards engineer with many technical info of the producing tactics and collects crucial elements corresponding to greatest available precision, mistakes or reference values.

Many examples of concrete calculations, difficulties and their recommendations illustrate the cloth and help the educational reader. the net addresses given within the appendix supply with a quick hyperlink to additional info sources.

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The basic substances in carbide-forming materials are oxides of tungsten, titanium and tantalate. A powder mixture of tungsten carbide (WC) or titanium carbide (TiC) and cobalt is first pressed into moldings and then sintered afterwards at 1300 to 1600 °C. In current practice, only sintered cemented carbides (cemented carbides, German abbbrev. HM, for short) are used. Denomination of cemented carbides Cemented carbides are identified by letters, colours and numbers. The letters P, M and K specify the materials’ major machining groups.

The contour of the finished part is usually created in a number of cuts. Infeed is performed outside the workpiece before each cut. 1). This method is applied to cut a cylindrical workpiece to a certain diameter. 2), the tool moves normally to the workpiece axis. It is used to machine an end surface or a shoulder. The motional direction of the turning tool depends on the type of machining, the cutting edge form and the tool position, as well as on the workpiece geometry (hollow part, solid). In roughing, a motion from the outside to the inside is preferred, whereas in finishing the reverse is true.

Due to the interaction between the material to be removed and the cutting material, the following materials are used depending on type of the metal removal procedure, cutting method, desired tool life, required temperature resistance etc. 1 Unalloyed tool steels Since these steels have low heat resistance, which, in turn, results in low cutting speeds, they are only of minor importance in practice. The most essential data for unalloyed tool steels are given below. 2 High speed steels Thanks to alloying elements which form carbide, such as chromium, molybdenum, tungsten, vanadium, these have higher hot hardness, substantially better wear resistance and high retention of hardness.

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