Общий каталог ZCC-CT 2019 - страница 1116

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TurningMillingDrillingTechnicalInformationIndex Technical information – drilling Technical information Solid carbide thread formersWhat is thread forming? A The material fibres aren't severed but compressed at the base of the thread. This is why no material is lost unlike when thread cutting. Advantages of thread forming: – The thread is formed much more precisely. – The thread is more resilient. – The threads have a very smooth surface. – Higher rotation speeds and feed rates possible than in thread cutting. – Longer tool life increases the productivity. Disadvantages of thread forming: B – Higher requirements on the hole tolerance. – Can't be used as hand tool. – Greater heat build-up than in thread drilling. – Limited material choice. – Often the use of a release agent is necessary. Thread formers should be used in materials with good cold formability. Next to steel, stainless steel and aluminium alloys, these include light metals and light metal alloys with a yield strength of 1200 N/mm². Basically, all long-chipping materials are suitable. C Fibre orientation after thread cutting Fibre orientation after thread forming D E C175