Sectional tap

Abstract

The invention discloses a sectional tap. The sectional tap comprises a tap working part, a tap handle and a nut; the tap working part consists of a cutting part, a calibrating part and a chip accommodating tank; threads are distributed on the cutting part and the calibrating part; front angles of the threads are 10 degrees; the relief grinding quantity of the cutting part is 5.5 mm; the relief grinding quantity of the calibrating part is 0.1 mm; the taper of the tap working part is 0.08 / 100; and an oil tank is cut on the back cutter surface of the cutting part. Through the design of the frontangle of the sectional tap, the relief grinding quantity and the oil tank, the cutting strength and the diameter stability of the tap are improved. The cutting part is 10-15 mm long, and the cutting taper angle is 10-15 degrees, so that the cutting load is reasonably distributed, the tap stability is maintained, the cutting capacity is improved, and the functions of a first tap and a second tap are shared. Through the design of the taper of the tap working part and the relief grinding quantity of the calibrating part, the calibrating part bears the functions of the second tap and a third tap.

Description

technical field [0001] The invention relates to the technical field of large taps, in particular to a combined tap. Background technique [0002] Large-scale taps are mainly used in the production of large-scale mechanical equipment for power station construction, such as taps for machining M170 screw holes in cylinders of 600,000-kilowatt steam turbines. As the installed capacity of steam turbines continues to increase, the size of the connecting thread between the runner and the main shaft, the rotor arm and the blades will also increase. The processing of ultra-large machine taps with a diameter ranging from M140 to M180mm has become a key technology for steam turbines, and the corresponding size The tap has exceeded the scope of market supply, and the company has to make its own according to the actual product. [0003] Usually, when tapping internal threads with a pitch of 4 to 6 mm and a diameter of M140 to M180 mm, a group of two taps with one taper and two tapers or...

AI Technical Summary

Problems solved by technology

[0004] The tap working part of the existing tap is integrated with the tap handle, but compared with the tap handle, the tap working part is prone to failure, and the service life of the handle is relatively strong. When the two are integrated, it is easy to cause the tap The waste of the handle, thus increasing the cost of the enterprise

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