SU1340878A1 - Method of forming the working part of chipless taps - Google Patents

Abstract

The invention relates to the processing of metals by pressure, in particular to methods of forming the working part of chipless taps. The aim of the invention is to improve the quality of the products obtained. According to the method, during preliminary profiling, a thread is formed along the entire lateral surface of the workpiece, and during subsequent profiling, the semifinished product is compressed in sections corresponding to the finished edition of the threaded zones. Crimping is carried out in a deforming tool, made in the form of a punch and die, or radially movable punches. When deformed, the material of the workpiece is moved in the radial direction from the center to the vertices of the faces. As a result, teeth are ground over the entire profile. 20 il. S (L SLE O 00 OO

Description

13408

The invention relates to the processing of metals by pressure, in particular, to methods of forming the working part of the chipless taps.

The purpose of the invention is to improve the quality of the products.

Figure 1 shows the workpiece tap, the working part of which has

round cross section; FIG. 2 is a section A-A in FIG. 1; Fig 3 - a workpiece with a cross section of the working part in the form of a regular polygon with vertices in the form of circular arcs; figure 4 - section bB in fig.Z; 15 tsei 3 I. punch 4, the shape of the cross figure 5 - blank with a rolled thread profile with a round cross-section of the central part; figure 6 - scheme knurling thread; figure 7 - view of the thread profile; 8 shows a tap with a finally shaped cross-section; figure 9 - section bb In fig. eight; Fig. 10 is a diagram of a device for deforming a workpiece in its initial position; figure 11 is the same in the working position; Figure 12 is the same after the end of the process; in fig. 13 - zagot.ovka tap with the working part of a circular cross section; on Fig section GG on Fig; on Fig - blank with thread on the entire working surface; in fig. 16 - section D-Dnafig.15; in fig. 17 - tap with a finally shaped cross section; in fig. 18 - section E-Enafig.17; Fig. 19 is a diagram of a device for deforming a workpiece in its initial position; on Fig - the same, in the working position.

In Figures 1-20, the following notation is adopted: d, is the diameter of the workpiece; t is the depth of the flats; p - thread pitch; A is the outer diameter of the thread of the tap with a circular cross section; - the average thread diameter of the specified tap; dg - internal diameter of the thread specified tap; d is the outer diameter of the thread of the tap after forming the cross section; df-p - the average thread diameter of the specified tap; d - internal meter of the specified tap; p is the radius of curvature over the outer diameter of the thread of the tap; pj is the radius of curvature according to the internal diameter of the tap thread; k is the backing value,

The method is carried out as follows.

Get the workpiece 1 tap with the working part of the round transverse

cross sections with diameter d ,, .. A cross-section of the tap is formed; flats of depth t are formed, for example, by milling with grinding grinding,. A threaded profile is formed on the workpiece with thread-rolling rollers 2 with pitch p equal to the pitch of the thread of the tap, and diameters

wed

en

Central zone

it has a circular cross section with a diameter d

ai

The obtained semi-finished product is installed between the matrix section of the working surfaces of which corresponds to the shape of the troughs of the cross section of the tap, between the working surfaces are grooves, the width of which B is equal to the length of the tooth. in the cross section of the tap, and the height B exceeds the height of the tooth h of the tap. When deformed, the material of the semi-finished product moves radially from the center to the vertices of the faces. As a result, teeth are screwed across the entire profile.

By changing the distance between the die and the punch, you can provide the required mbie dimensions dj and d (-p the tap, and change the workpiece diameter d and the depth of the flats t, provide the necessary amount of relief k. After that, the thread profile is finally formed by plastic deformation

getting the required size d

0

five

0

and d

Wed

A possible embodiment of the method, according to which a billet in the form of a round rod is used, on which an unshaven threaded profile is rolled over the entire perimeter (Fig. 15) with a pitch equal to the tap thread pitch; the diameters of d, J bn are deformed into a semi-finished product with a cross section 5 punches 6 with a threaded profile, and threaded working surfaces of the punches in the cross section are identical to the shape of the non-working faces of the finished tap. During deformation, the entire thread profile of the tap is described by the curves of variable radius of curvature along the outer p. and internal g pj. surface m. The magnitude of the rear of the casing is provided by the magnitude of the stroke of the punches.

Thereafter, the threaded profile is finally formed in axial sections of the working part, passing through the vertices of the faces, by plastic deformation (rolling) to obtain the required dimensions d, and.

PRI me R. Made without a tool; gum tap of size M4. On a lathe, a billet of circular cross-section with a diameter of 3.34 mm was obtained, four flats with a depth of 0.2 mm were made by milling. An open threaded profile was formed for the non-working part of the workpiece with a thread-roller. After that, the obtained semi-finished product was deformed, obtaining a product with the dimensions of 134

whose parts 03

mm

d (. 3.67 mm.

:

fug /

h and

; oo ao340878 F

formula of the invention The method of forming the working part of the brushless taps by pre-shaping the billet with its relief on its side surface and the subsequent profiling of the obtained semi-finished product by radial roasting,

10 characterized by the fact that, in order to improve the quality of the products obtained, with preliminary profiling, a thread is formed on the entire side surface

15 blanks, and during subsequent profiling, the semi-finished product is compressed into sections that correspond to threadless zones in the finished product.

one

4Fig

.

fie.8

fpus.7

F “g. five

t

dcp /.

Phage.5

FIG. fO

(iv. 11

Fi.12

BUT

Srig. 13

FIG. fS

Fig.17

TO

Yr

frK

(rig; "1

Fiie.15 EE

R

1-g

Fig.Gv

(PU8. / 9

Editor M.Tovtin

Compiled by A. Bystrov

Tekhred L.Oleynik Proofreader L. Patay

Order 4381/14 Circulation 582Subscription

VNIIPI USSR State Committee

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

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

Claims (1)

Claim The method of forming the working part of chipless taps by pre-profiling the workpiece with obtaining a relief on its lateral surface and subsequent profiling by radial firing of the obtained semi-finished product in local areas, characterized in that, in order to improve the quality of the products obtained, pre-shaping leads to thread formation along the entire side surface j skating rink. After that, the resulting semi-finished product was deformed, obtaining a product with the dimensions of the working part d _H -4.03 mm = 3.67 mm. Fig.% B-δ blanks, and with subsequent profiling of the semi-finished product is crimped in areas corresponding to the threadless zones in the finished product. Aa FIG. 7 FIG. S FIG. 77 Gg FIG. 74 FIG. fifteen Fi gis G ' Fig.17 FIG. 18 FIG. 20 Compiled by A. Bystrov Editor M. Tovtin Tehred L. Oleinik Proofreader L. Patay Order 4381/14 Circulation 582 Subscription VNIIIPI of the USSR State Committee for Inventions and Discoveries 113035, Moscow, Zh-35, Raushskaya nab., 4/5 Production and Printing Enterprise, Uzhhorod, vul. Project, 4