SU845996A1 - Apparatus for reducing tube blanks - Google Patents

Description

The invention relates to metal forming and, more particularly to apparatus for reducing round billets, and can be used in all areas of the economy to handle without chip removal by HA ^s ruzhnomu diameter hollow parts of a length more than 2.5 times exceeds diameter.

A device for reducing ^ round billets, comprising a housing mounted matrix movable in the axial direction of the upper plate fixed therein coaxially matrix core and means for centering the workpiece ₁₅ relative tepno punch. This tool is made in the form of a shoulder on a punch, beveled at an angle of 30-7 5 ° to the generatrix of the punch. Before reduction on this device, the upper toren of the pipe is also cut at an angle of 30-75 ° [1].

However, such machining increases the complexity of the entire reduction process.

The purpose of the invention is to reduce the complexity of preparing pipes for reduction.

This goal is achieved in that in the device. For reducing tube blanks containing a matrix mounted in the housing, an axially movable upper plate, a punch fixed therein coaxially with the matrix and means for centering the workpiece relative to the punch, the tool for centering the workpiece is made in the form of a traverse with a hole for the entry of the punch connected to the top plate of the device by rods. with springs, and the hole in the traverse contains a cylindrical part whose diameter is equal to the diameter of the punch, and conic energy part, whose height is selected from ratios x 1 (n · * 1) Do ~ Dn 'where the height of the conical part of the hole in the crosspiece, mm;

S 84599Θ

L _o - the length of the original pipe billet, mm;

p - ass of tolerance on the external diameter of the original pipe billet, mm;

nominal outer diameter of the initial billet, mm;

- diameter of the punch, mm • diameter of the cylindrical belt of the matrix, mm;

с £ _m is the angle between the axis and the generatrix of the entry cone of the matrix; the angle between the axis and the generatrix of the conical hole in the traverse, comprising 15-30 °.

This device allows you to accurately set the reduced workpiece coaxially to the matrix without pre-processing their ends. Failure to comply with the condition defined by the ratio for the height of the conical part of the traverse hole will not ensure reliable penetration of the upper end of the workpiece during the working stroke into the conical part of the traverse hole.

In FIG. 1 shows a device, general view, initial position; in FIG. 2 - the same, the end of the stroke.

Device for pipe reduction. the blank contains a matrix 1 installed in the housing 2, and a punch 3 fixed in the upper plate 4 coaxially with the matrix 1. The device has a traverse 5 in which a central hole for the entrance of the punch 3 is made, having a cylindrical part in its upper part ~ 35 shape, and in the lower <Г - the shape of a truncated cone. The diameter of the cylindrical part O 9 to the matrix. In the housing 2 of the device and the bottom plate 8 there are two holes b for the rod 6.

The device operates as follows — ^-5 ° C.

. The workpiece 9 is installed in the matrix 1 and pre-centered along the hole B. When the press slide moves down, the top plate of the device 4 is lowered together with the punch 3 fixed therein and the traverse 5 hanging on the rods 6. The upper end of the workpiece 9 enters the conical part of the traverse and installed on it coaxially with the punch 3, set on the matrix 1, and the lower end of the workpiece is centered on the inlet cone of the matrix 1, With the further course of the press slide down, the punch 3 rests on the upper end of the workpiece 9 and pushes it through the matrix tsu 1. In this case, the traverse 5 reaches the plate 8 and stops, compressing the springs 7, and the rods 6 pass through the 2 _L holes in the plate 8 and the housing 2. The reduced workpiece falls down. With the reverse stroke of the press slider up, the springs 7 return the yoke 5 to its original position.

Normal operation of the apparatus is provided with a height of the conical part of the hole in the crosspiece selected from the ratio _of s

G. 0 _Μ -Ώ _ο + -ί5Π \.

) where

B _Oh “

С0 _К “of the conical part of the open- traverse, mm;

height of steel in the length of the initial tube billet, mm;

field of tolerance on the outer bottom - ·, meter of the original pipe billet, mm;

nominal outer diameter of the initial billet, mm; punch diameter, mm;

diameter of the cylindrical belt of the Matrix, mm;

the angle between the axis and the generatrix of the lawful cone of the matrix;

the angle between the axis and the generatrix of the conical hole in the traverse, comprising 15-3 0 *.

Claims (2)

the length of the original billet, mm; P - ass tolerance on the outer diameter of the original billet, mm; nominal outer diameter of the original billet, mm; punch diameter, mm (J is the diameter of the cylindrical matrix, mm; cLfA = between the axis and forming the entry cone of the matrix; the angle between the axis and forming the conical hole in the cross bar, which is 15 ° 30 °. This device allows you to precisely set the reduced blanks coaxial to the matrix without pretreatment of their ends. Failure to comply with the conditions determined by the ratio for the height of the conical part of the crosshead hole does not ensure that the upper end of the workpiece will safely fall into the conical part of the traverse. Fig. 1 shows the device, general view, initial position, and Fig. 2 is the same, the end of the working stroke. The device for reducing billets includes a matrix 1 installed in the housing 2 and a punch 3 fixed in the upper plate 4 coaxially with the matrix 1. The device has a yoke 5, in which the central opening dp of the entrance of the punch 3 is inserted, having a cylindrical shape in its upper part and a truncated cone shape in the lower f. The diameter of the cylindrical part O is equal to the diameter of the punch 3. Traverse 5 is connected to the upper platform 4 of the device 6 and the springs 7 are attached to it. On the matrix 1 there is a lower plate 8 that has an opening B that matches the opening of the die and is intended to be installed blanks 9 in matri zu. In the housing 2 of the device and the lower section 8, there are two openings 1 under the links 6, The device operates as follows. . Preparation 9 is installed in the matrix 1 and is pre-centered on the opening B. During a press slide downward, the upper ppita of the device 4 is lowered together with iTyaHC No. 3 fixed in it and hanging on the tracks 6 with the cross-bar 5 The upper end of the workpiece 9 falls into the atomic part of the crosspiece and is installed on it coaxially with the punch 3, extruded by the matrix 1, and the lower end of the preparation is centered on the lead-in die of the matrix 1. When further pressing the popun press down, the punch 3 rests against the upper end of the workpiece 9 and pushes it through the matrix 1. When. In this way, the traverse 5 comes to the plate 8 and stops, compressing the spring 7, and the rods 6 pass through the holes of the plate 8 and the body 2. Reduction of the workpiece falls HHai. During the return stroke of the press ram up the spring 7 return the yoke 5 to its original position. The normal operation of the device is ensured at the height of the conical part of the hole in the traverse chosen from the ratio LO) dM-T) - «KWo%. -Be-about ,,, / height of the conical part of the hole in the traverse, mm; the length of the original billet, mm; field tolerance for the outer diameter of the source billet, MMJ nominal outer diameter of the original billet, mm; punch diameter, mm; - diameter of the cylindrical plane of the Matrix, mm; the angle between the axis and the generator of the feed cone of the matrix; cL angle - between the axis and forming a cat's hole in the crossbar, which is 15-3 O. Claims of the invention A device for reducing billets, comprising a mat mounted in a housing, an axially movable upper axle, a fixed punch in it and means centering the workpiece relative to the punch, characterized in that with a chain higher than ha of productivity by reducing the laboriousness of preparing pipes for reduction, the tool for centering the workpieces is made in the form of a cross bar with a hole m, associated with the upper plate of the device t gami with springs. moreover, the hole in the traverse has a cylindrical part, the diameter of which is equal to the diameter of the punch, and the conical part, the height of which is selected from the Bo-Dn ratio) () where 1l | x is the height of the conical part Ь of the traverse, mm; L (Q is the length of the initial billet, mm; P is the tolerance field for the outer diameter of the initial billet, ki, mm; DO is the nominal size of the initial billet, mm; mm punch diameter; - diameter of a cylindrical matrix pf, mm; the angle between the axis in the pattern of {{1} the lead-in cone of the matrix, угол (, is the angle between the axis and the shape of the conical hole in the valve, 15-30 Sources of information taken into account in the examination of the USSR Copyright Certificate 009, kp. 21D41 / 04, 197 3 e) ig.g