SU1232394A1 - Apparatus for cutting pipes - Google Patents

Description

The invention relates to the processing of metals by pressure, in particular to devices for cutting pipes, and can be used in the blanking production of machine-building plants for producing dimensional tubular blanks.

The aim of the invention is to improve the quality of the resulting blanks.

FIG. I shows a pipe cutting apparatus, a slit; Fig. 2 shows a section A-A in Fig. 1 (a variant of the device, for cutting circular pipes of cross section); Fig. 3 shows a section A-A in Fig. 1 (a variant of the device for cutting pipes of a diamond-shaped cross section).

The pipe cutting device comprises a sleeve 1 in which the mandrel 2 with the elastic ring 3 and the fixed stop 4 and the shaped matrix 5 are coaxially mounted. The device is also equipped with a system for returning the deformed pipe section consisting of the split sleeve 6 with the inner surface in the form of the cut blank and limiter 7 of its deformations set concentric to the clip.

The device works as follows.

in a way.

During the stroke, the elastic ring 3 is compressed in axially on the L-A

five

ten

15

323941

between the fixed stop 4, the movable mandrel 2 and the movable stop 8. The elastic ring 3, expanding in the diametrical direction, produces plastic deformation of the tubular billet 9 in the area of the cutting matrix of the matrix 5. As a result of plastic shear, a piece of tubular billet 9 occurs. , deformed together with the cut section of the tubular billet 9, experiences only elastic deformations, which is explained by the use of the limiter 7 of its deformation. The radial clearance between the split bushing and the strain limiter is selected in the range of 1.05-1.2 wall thickness. A gap less than 1.05 of the pipe wall thickness is unacceptable, i.e. does not lead to cutting of the material due to too small amount of plastic shear. A gap greater than 1.2 the thickness of the pipe wall causes plastic deformation of the spring split sleeve, which is also unacceptable. After (; a deforming force), the sleeve restores its original shape under the action of elastic forces. The cut section of the tubular billet, which is covered by the dissolved sleeve, is deformed last and takes on its original shape.

LA

20

25

thirty

Fig j

Compiled by V. Shebalkin

Tehred I. Gaidosh Proofreader S. Shekmar

Order 2727/13 Circulation 100 Subscription VNIIPI USSR State Committee

for inventions and discoveries P3035, Moscow, Zh-35, Raushsk nab., 4/5

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

Claims (1)

DEVICE FOR CUTTING PIPES into billets, containing a cutting matrix with an annular cutting edge, a deforming unit placed coaxially with the cutting matrix and made in the form of an elastic ring placed between the stops, at least one of which is movable, and also the recovery unit deformed during cutting parts of the pipe, made in the form of an elastic element 'of a circular shape, located coaxially with the edged matrix, which is related to the fact that, in order to improve the quality of the obtained workpieces, the elastic element of the assembly becoming deformed during the cutting of the tube is designed as a slotted sleeve and provided with its stopper _Q deformation. <2 Figure 1