(2010) An experimental study on the effects of lubrication in form tapping, Tribology International, Vol. Journal of Materials Processing Technology, Vol. (2012) Experimental study of forming and tightening processes with thread forming screws. (2003) Effects of synchronizing errors on cutting performance in the ultra-high-speed tapping. HENDERER, T, (2006) Solid synchronicity: realizing true high-speed synchronous tapping with solid-carbide tools.(2002) Investigation of thread tapping load characteristics through mechanistic modeling and experimentation. (2002) Predictive models for the forces and torque in machine tapping with straight flute taps. (2012) Analysis of form threads using fluteless taps in cast magnesium alloy (AM60). (2017) Optimization of the Pressure Porous Sample and Its Manufacturability by Selective Laser Melting, Manufacturing Technology, Vol. Keywords: tool life, thread, tap, experiments, helix angle, tool wear The types of tool wear have been also analysed at individual cutting speeds. Achieved results were statistically processed and the dependencies of thread length (m) and tool life (min) respectively on the cutting speed were plotted. The changes in a size of the M12 thread outside the tolerance field 6H, the visible changes in tool wear and the brittle fractures of the tools have been selected as the criteria for tool life evaluation. Microhardness of the workpiece bars was checked within preliminary tests as well as a rank angle of tools to be ensured the same conditions of experiments. They were produced from C45 steel that is a standard material used at long-term tests of tool durability. The holes for threads making were pre-drilled into workpieces that were bars (with a cross-section of 30 x 60 mm). Three helix angles ω = 0°, 15° and 35° of taps have been investigated at the cutting speeds of 10 mmin-1 (within the first experimental phase) and 20, 30, 40 mmin-1 (during the second phase). They were produced from high speed steel with cone type C. During long-time tests, the uncoated taps for M12 threads making were used. The article deals with an experimental investigation tool life of the thread making tools. Jana Pawla II 37, 31-864 - Cracow, Poland UTB Tomas Bata University in Zlin, Faculty of Technology, Vavreckova 275, 760 01 Zlin 3Ĭracow University of Technology, Faculty of Mechanical Engineering, Al. TU Kosice, Faculty of Manufacturing Technologies with the seat in Presov, Sturova 31, 080 01 Presov, Slovakia 2 But it’s the machinist who decides which tapping style to use depending on the job at hand.Manufacturing Technology 2018, 18(5):787-792 | DOI: 10.21062/ujep/178.2018/a/1213-2489/MT/18/5/787 Tool Life Investigation of the Thread Making Tools Katarina Monkova 1,2, Peter Monka 1, Jozef Jurko 1, Ondřej Bílek 2, Jacek Habel 3 1 Compare that to cut threads, which because of the tools used, cause grain structure to essentially fracture.Īlso, formed taps have a longer life, as they last about three to 20 times longer than cut taps.Ĭutting taps and forming taps both have benefits and limitations from stronger threads to greater compatibility. But machinists aren’t limited to the materials when they decide to cut taps.Ĭutting taps also have the upperhand regarding horsepower, as this threading method requires less power than forming taps.įormed threads are stronger because the grain flow of materials is compressed at the crest and root of the thread form. When machinists use forming taps, they can only use the process on aluminum, soft steel and nonferrous metals. The two threading methods tap holes differently, but they also have a handful of other differences, starting with the type of thread each method produces.Ĭutting taps are more versatile than forming taps and can be used with more materials. Additionally, forming taps usually require a larger hole because this style causes a material to thread away and into the threads of the tap. Forming taps involves the displacement of a material (like metal) within a hole. Unlike cutting taps, forming taps create external threads. This gradual cutting motion allows a tap to smoothly enter a hole. This process then leaves an internal thread that meets the machinist’s desires.Ī machinist achieves that geometric precision by using tools that come with a feature called the chamfer, which cuts a 90-degree angle or edge to make it more symmetrical. Cutting a tap means using tools that remove material from the tapped hole, according to North American Tool. When machinists need to create internal threads, they opt for cutting taps. Cutting taps and forming taps produce threads that are interchangeable and gauge identically, but those are the only similarities between the two tapping styles.
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