SU1279764A1 - Tapping die - Google Patents

Abstract

The METER, including cutting and deforming areas in the form of protrusions located on each tooth consistently across the width of the pen from the front surface, is different. u and with the fact that, in order to ensure reliable operation, the protrusions of the deforming portions of the adjacent teeth from the side of their common threaded hollow are made relative to the front surface of the teeth at different distances.

Description

, 127

The invention relates to metal working and can be used to cut threads of increased accuracy.

The purpose of the invention is to increase the reliability of the tap by eliminating the breakdown of the tops of the thread.

FIG. 1 shows a tap schematically, a general view, in FIG. 2 shows the tooth profile of the tap on the side of the intake cone; in FIG. 3 - the same, from the side of the shank in FIG. 4 - arc sections of two adjacent tap teeth along the average diameter, turned into a plane.

The tap contains the intake part 1, the calibrating part 2 and the shank 3. On each tooth of the tap, the cutting width 4 of the pen has cutting sections 4 with the size of the nape K falling and plastically deforming (smoothing) sections 5 and 6 with the value of the nape falling 1.5 K. Sections 5 and 6 are barrel-shaped in arc sections and offset to the back of the pen. The amount of displacement from the front surface of the teeth of section 5 (0.5-0.6) F, and section 6 rv. 0.8 F, where F is the width of the pen. The average diameters on the plastically deforming (smoothing) areas of the teeth d are larger than the average.

diameters on the cutting areas of the teeth p

dg depending on specific mustache

. 2

processing fia 0,0t-0,04 mm. In this case, d "in sections 5 and 6 are equal. The backing out value K is taken such that the distance a between the protrusion and the cutting edge of the tooth would be no more than the distance b and c between the cutting edge and understatement of the pain, i.e. a b and a c.

During operation, due to the fact that a lower section of another is always opposite the protrusion of one tooth, the top of the thread being machined can, under the conditions of a b and a c, be elastically deformed towards the low section. Thus, it is subjected to only one-sided force action, which reduces the force exerted on it by the deforming sections of the tap.

As a result, a significant reduction or complete elimination of a possible breakdown of the tops of the thread during its manufacture with small steps is provided.

The profile of the teeth of the taps is made on the usual thread-grinding equipment. First, a profile can be made with two deformations in sections on each tooth using a cam of the appropriate configuration. Then, by additional passes, when one of the sides of the grinding wheel is lowered, one of the deforming sections is removed on one rtorone of the tooth, then on the other.

.

0.8F

FIG. 2

Compiled by A.Frolov Vedaktor E.Sligan Tehred L. Serdeu ova-h Proofreader SLPekmar

Order 7000/11 Circulation 1001 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Fi & .3

FiL

Claims (1)

TAPER, including cutting and deforming sections in the form of protrusions, located on each tooth sequentially along the width of the pen from the front surface, distinguished by the fact that, in order to increase reliability, the protrusions of the deforming sections of adjacent teeth from the side of their common threaded depressions are made relative to the front surface of the teeth at different distances. 1 279764