SU1180270A1 - Hydromechanical press - Google Patents

Abstract

STAMP FOR CUTTING PIPES according to ed. St. No. 1092013, characterized in that, in order to improve the quality of the cut, it is provided with hemispherical inserts placed in the protrusions of the fixed sleeve knife and wedges rotatably, and the contact surface of the gland plates with the sleeve knives is spherical, the center of which is located on axes of the corresponding sleeve knife. AJli n (L 00 o GhE Fig. A -A o

Description

The invention relates to the processing of metals by pressure, can be used in the industry for cutting round pipes into billets and is an improvement to a die for cutting pipes according to the main ed. St. No. 1092013.

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

FIG. 1 shows the proposed stamp at the end of the process of cutting pipes, open, their form; in fig. 2 is a section A-A in FIG. one; in fig. 3 is a section BB in FIG. one; in fig. 4 —Used I in FIG. 2, the initial position; in fig. 5 - the same, the moment of compression of the pipe.

The pipe cutting punch contains an upper movable plate 1 with a housing mounted on it, consisting of two cheeks 2 and 3 rigidly interconnected, as well as a lower fixed plate 4 with a pipe guide 5 rigidly mounted on it and a cradle 6 for a fixed sleeve a knife 7, coaxially with which a movable sleeve knife 8 is installed, covering the cut-off part of the pipe.

Bushing knives 7 and 8 are made with protrusions 9 and 10 having inclined 11 and vertical 12 flat portions. Self-aligning hemispherical inserts 13 are embedded at the intersection of the sections 11 and 12 of the fixed knife 7.

In the cheeks 2 and 3, wedges 14 and 15 are mounted with inclined 16 and vertical 17 flat portions, at the intersection of which are built-in self-aligning hemispherical inserts 18, which interact with planes with inserts 13.

The coaxiality of the bush blades 7 and 8 is provided by the projections 19 and 20, the cradle 6, the insert 21, the guide pins 22 and 23, and the spring-loaded gland plates 24 and 25. The side bars 26 and 27 close the blades in the axial direction.

The contact surfaces of the 28 gland strips 26 and 27 and the knives 7 and 8 are made

spherical with a center aligned with the axis of the knives 7 and 8.

The device works as follows.

When the upper movable plate 1 with the housing moves downward, the inserts 18 mounted therein act on the projections 10 and the inserts 13, respectively, of the movable 8 and the fixed 7 knives, which begin the process of pipe compression.

 When the insert 21 reaches contact with the movable knife 8, the latter stops the process of pipe compression. At the same time, the process of pipe crimping with a fixed knife 7 ends at the transition of liners 18 s.

 the inclined section 11 on the vertical section 12 of the projections 9.

The stresses arising from this (in the pipe walls must be within.

Bulr 6-C bt,

0 where 5 is the voltage in the pipe walls when it is

crimping;

Mj, the limit of elasticity; (t - yield strength.

Upon further movement of the plate 1 5 down there is a cutting operation.

When the upper plate 1 with the housing returns to its initial position, the knives 7 and 8 are removed from the straight sections of the clutches 14 and 15 by engaging the projections 19 and 20 and holding the fixed knife 7 by the pipe in the guides 5. pipes and blanks. Then the cycle repeats.

The process of compression and release of the pipe is accompanied by closing and opening of the knives 7 and 8. But since the axis of the contact spherical surface 28 is aligned with the axis of the knives, the contact between the spring-loaded gland plates 24 and 25 and the knives 7 and 8 is gapless.

Compared with the basic object, which is a known device, the use of the invention improves the quality when cutting round pipes in a die.

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Claims (1)

STAMP FOR CUTTING PIPES by ed. St. No. 1092013, characterized in that, in order to improve the quality of the cut, it is equipped with hemispherical inserts placed in the protrusions of the fixed sleeve knife and wedges with the possibility of rotation, and the contact surface of the clamping strips with the sleeve knives is made spherical, the center of which is located on the axis of the corresponding sleeve a knife. 4- | X |