SU1036483A1 - Chipless tap - Google Patents

Abstract

The stripperless, containing profile with radius in height, deforming faces, characterized in that, in order to increase durability, the deforming faces on the sides of the profile are made with radius with increasing radii from the base of deforming faces to their tops. FIG. i AV (L in WITH about 4Sh 00 WITH

Description

The invention relates to mechanical engineering, to tools for obtaining internal threads by plastic deformation.

A tap is known, the teeth of which are barrel-shaped in arc sections, i.e. each tooth has a double backing with respect to its middle. As a result of this double backing, teeth are formed on the teeth x, which are in contact with the profile of the thread already formed and serve to direct the tap 1).

The disadvantage of this tap is that they are not suitable for machining threads with plastic deformation, as well as difficult to manufacture. In that case, if the guide teeth deform; the allowance left by the cutting edges, the magnitude of the torques M, p increases dramatically, since the contact of the areas of the teeth with the thread profile is too large. This leads to / breakage, reducing their durability, especially small-sized tools.

 The aim of the invention is to increase tool life.

This goal is achieved by the fact that, in a chipless tap containing deforming edges with a radius along the height of the profile, the latter are made along the sides of the profile with increasing radii from the base of the deforming faces to their vertices.

FIG. Figure 1 shows the deforming face of the tap; in fig. 2 is a section A-A in FIG. 1, perpendicular to the forming profile; in fig. 3 is a section BB in FIG. 1, perpendicular to the forming profile; in fig. 4 is a view of B in FIG. one.

The deforming face 1 is made of a radius along the height of the profile, the lateral sides 2 and 3 of the profile of the deforming face are made radial with a radius of r (Fig. 2). The deforming faces are ground along the profile with the relief value K (Fig. 3 shows the relief value K for the outer diameter, but it is the same over the entire height of the deforming edge). The deforming face 1 of the tap has radii along the outer mound,. average pp and internal ,, thread diameters. The radius of the deforming face on the lateral side of the profile H}, .. is larger than g.

Tap works as follows.

At the beginning of the stroke, the first deforming edges of the intake part form a screw groove of the thread. Subsequent shaping edges deepen its calibrating edges, finally shape the thread and serve to guide the tap. Ptsy reverse stroke tap out of inverted. thread.

The shape of the facet section is most favorable for the conditions of plastic deformation of the metal, as the screw groove profile is gradually widened; wider than vertices, to increase their durability, it is made more pronounced than vertices than at the base

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Increasing the strength of the wrinkles of the deforming edges and reducing M. applied to the tool in the process of obtaining the thread increases the resistance of taps.

The use of taps of the proposed design allows to increase their durability.

2

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Claims (1)

FLAWLESS TAPE, containing deforming faces radial along the profile height, characterized in that, in order to increase resistance, the deforming faces along the sides of the profile are made radius with increasing radii from the base of the deforming faces to their vertices. SU ... 1036483