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 At this time, using lubricating oil will make it easier to drill the hole because the tap will be able to turn more smoothly.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 After turning it halfway around, return it to the original position and turn it again to drill the hole deeper. The first guide hole must be made at the entrance of the hole, and it is very difficult to make this guide with a finishing tapered tap. If you use a non-tapered tap for finishing the hole, it will usually not work. Once the hole is drilled, the first step is to cut a tapered hole. If the hole is small, it can be corrected, but if the hole is larger than the screw, the screw hole must be made one size larger. The right size of screw should be chosen depending on the size of the hole. It can be said that those who can successfully drill screw holes have a certain level of experience and skills in metalworking.īefore drilling a screw hole, the original hole must first be drilled with a drill. Without repeated practice, the screw hole may be slightly bent or the groove part of the screw hole may be crushed. The process of cutting a screw hole is quite difficult. Tap wrenches are used together with taps when you want to use screws, such as when repairing a screw that does not fit well in the original screw hole or when you want to connect metal parts with a screw. Of course, when cutting large screw holes, it becomes difficult to do so by hand. Threaded holes can be drilled manually in materials that are not so hard, such as steel. Tap wrenches are used for turning taps when cutting threaded holes. There are several types of taps, ranging from tapered types that are tapered to dimensional types that are almost the same in diameter throughout. A long, thin drill-like tool called a tap is attached to the square hole in the center and fixed firmly in place. The tap wrench is in the form of a long, thin rod, which is turned by placing one's hands on the left and right handles. Special tools are required when making screw holes, and one of these special tools is a tap wrench. A tap wrench, also called a tap handle, is a tool used for manually cutting screw holes.
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