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Tap use method:
(1)When tapping, insert the nose to tap the center line and the center line of drilling.
(2)Both uniform rotation and slightly pressure to tap the feed, feed after don't add pressure.
(3)Each turn tap a reversal about45°To cut off the chip, so as to avoid blocking.
(4)If the increase in rotational force can not rotate or tap tap difficulties, will break.
1At the end, the tapping orifice chamfering; tap hole coaxial with the workpiece; tapping should begin to apply an axial force to tap into the breakthrough after a few laps will no longer need to exert axial force.
2When the tap calibration part into the screw hole, each positive half turns to a circle to return1/4，1/2The cutting ring, broken down again after school; take the through hole, often exit tap chip.
3In tapping the steel workpiece when cutting fluid tapping in cast iron workpiece, can add a little kerosene; with a taper, and then two attack and three attack, must be screwed in the screw tap.
4When threading the workpiece, end to chamfer, pull the tooth end surface shall be perpendicular to the axis of the work piece; threading began to be applied to a large number of axial pressure, rotate the corresponding pressure; when the pulling teeth cut threads on the workpiece, don't add pressure.
5From the set of silk to make the chip breaking, should be timely, reverse pull teeth often.
6The workpiece should be firmly fixed in the clamp, a clamping device; when the tap is broken, a hand to touch off don't clamp, chisel or punching out, broken wires must wear protective glasses.
Using the method of die:
With the wafer die when processing thread is half cutting half squeezing state. As the diameter of cutting part die diameter and die diameter, especially to bear large cutting force, it should have the strength and cutting ability. Taking into account the screw and the screw hole with the die cut out should have a certain gap, and taking into account the amount of wear, so die design, should make the diameter and diameter less than in diameter, the diameter of the thread in nominal size.jmM0.8The inner diameter of threadDwithin=0.584Mm, the diameter of dieDIn the plate. ,= 0.55Mm,M0.8The thread's diameterDin=0.67Mm in diameter should be to dieDBoardm．x= 0.67Mm, in general0.66—0.67Mm. In actual production, because the diameter of die wear caused by scrap rarely, so in the design of the diameter of the wear volume can be smaller. But if the size is too small, then push the pressure screw will get increased, so die diameter should not be too small. The outer diameter of the thread is by cutting metal in die extrusion of plastic deformation and. In order not to block the metal workpiece broken, die diameter should not participate in the work, to leave a gap between it and cut. Such as cuttingM0.8Die diameter minimum thread.0.8Mm, average diameter to increase0- 02^0.03Mm.
Matters needing attention：
In the end of the first bolt blank processing45The degree of chamfer, to prevent the generation of die suddenly in the guide blade loading phenomenon. At the same time to ensure that the circular tooth or hexagon die cut blank vertical bolt.