In the middle
d ——Extrusion tap diameter, mm
D——basic size of internal thread (large diameter), mm
T hD2 - internal diameter tolerance of the internal thread, mm, ei sd according to the 8th tolerance - deviation of the large diameter of the common cutting tap, mm
(2) Tap diameter d 2 = ( D 2 + 0. 4T hD2 ) + 1/ 3T sd2
In the middle
d 2 - the diameter of the extrusion tap, mm
D 2 - internal thread diameter, mm
T sd2 - normal cutting tap diameter tolerance, mm
(3) Tap diameter
The diameter of the extrusion tap is selected according to the maximum diameter of the common cutting tap.
d 1max = d 1 + ei sd
In the middle
d 1max - the maximum diameter of the extrusion tap, mm
d 1 ——maximum diameter of common cutting tap, mm
Ei sd - deviation of large diameter taps of ordinary cutting taps, mm
(4) The amount of tapping edge grinding is made into a multi-angle shape due to the extrusion taps. In order to involve the edges in the entire extrusion work, the parts not involved in the work need to be scraped off. The amount of shovel K is related to the diameter of the tap. The larger the value of K, the lighter the tapping thread and the smaller the tapping torque. The recommended K values ​​are shown in Table 1:
(5) Calibration part of the length of the calibration part, generally take (8 ~ 10) P, P is the pitch. 5〜0. 05mm。 The reaming amount of the 0. 03~0. 05mm.
(6) Determination of the diameter of the screw hole before extrusion of the internal thread
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