SU573276A1 - Tap for cutting tapered thread - Google Patents

Description

I

The invention relates to metal working, namely threading with taps.

Taps are known for cutting tapered threads with an even number of feathers. When threading these taps in a steel of increased VISCOSITY, chipping and chipping of the teeth are put on a chip, as the workpiece is hardened to a depth exceeding the thickness of the cut 1.

Other taps are known for cutting tapered threads, with an even number of feathers, in which, to reduce chipping and chipping, the teeth of the pens of the tap on the dripping part are cut through. This tap is closest to the invention according to its technical essence and the achieved result.

This tap is poorly centered in the hole to be machined, since reliance on the two remaining feathers when performing a tag with four feathers is unreliable.

The purpose of the invention is to improve the centering of the tap in the hole being machined.

For this purpose, in the proposed tap, feathers are cut across one width from the front face.

FIG. Figure 1 shows the described tap with an even number of feathers for cutting a tapered thread (fourfold), total BHs; in fig. 2 - section A-A on phage, 1.

The working part of the tap consists of intake 1 and 2 calibrating parts with pens 3, 4, 5, 6. Pen 3 and 5 have a width of P, pen 4 and 6J located between feathers 3 and 5, cut in width from the front by an amount h (6.08 0.16) F and have a width. The value of h can be cut pens ho their width F not on the entire working part, but only on the gauge.

A full thread profile tooth with a double slice thickness that is greater than the radius of the lateral side, the cutting edge of the teeth or. equal to him. As a result, the cutting is carried out outside the zone of work hardening or along a less hardened layer of metal. Undying teeth on narrowed feathers provide an increase in the contact length of the tool.

with threaded product and thereby improve its basing - centering along the hole, which provides a more stable, with smaller radial deviations, the movement of the tap in the work and, accordingly, the non-uniformity of cutting with working teeth of a full thread profile, and therefore more reliably prevents chipping , chipping teeth of tools and teasers on the surface to be treated.

GTping taps allow you to improve the quality of cutting and cutting, increase sticking costs and reduce tool consumption in the processing of steel products, as well as reduce the cost of manufacturing taps.

Partial cutting of the teeth of taps with a full thread profile through a feather is performed on conventional universal grinding equipment.

Claims (2)

1. Frumin Yu. L. High-performance thread-cutting tool, M., 1963, with. 47, phage. 43 .. 2. USSR author's certificate No. 73180, cl. In 23 G 5/06, 1947.