The method of radial extrusion, combined with the internal extractor with thinning of the pipe

 

(57) Abstract:

The invention relates to the processing of metals by pressure and can be used in various engineering industries in the case of molding of semi-finished products having the form of a pipe, details of various finite forms or details intended for additional processing, such as cutting. The method is based on the installation of the pipe, which can be pre-expanded at one end, in an appropriate form of the matrix, where on one side is the plug, which is held with a certain force and within which is freely movable mandrel, while on the other hand during the stroke contrepoison pulls the difference between the volume of the pipe, which is obtained when the exhaust pipe thinning in the direction of movement of contrepoison. Material source fills the gap between the mandrel and the pipe, between the pipe and plug and period of arbitrary shape in the plug or in the matrix. 1 C.p. f-crystals, 2 Il.

The invention relates to the processing of metals, in particular to the field of metal forming, and can be used in the processing of metal semi-finished products having the form of a pipe is ten way radial extrusion, combined with the internal extractor with thinning of the pipe (DE, patent 959876 B 21 K 21/08, 1956), which includes the hood with thinning on the inner side of the cylindrical tail portion of smaller diameter and radial extrusion of the pipe section between the smaller and larger diameters. The disadvantage of this method should recognize the limited scope of its application.

The technical problem to be solved by the present invention is directed, is to extend the field of application of the method.

The technical result obtained as a result of implementation of the method is to provide opportunities for parts of the elongated cylindrical tail and non-uniform diameter with strong thickening of the wall with simultaneous complex-shaped cross-section when using the standard tube stock.

To provide the above technical result tube having a pre-expanded upper part, is subjected to extraction with thinning on the inner side of the cylindrical tail portion of smaller diameter with subsequent radial extrusion of the pipe section between the smaller and larger diameters, and the tube is placed in the corresponding matrix, with storenational pressure in the radial extrusion, inside the pipe is injected frame, floating in the punch, and on the opposite side of the pipe enter contrepoison, the diameter of the upper end of which is equal to the diameter of the mandrel, and a specified length from the upper end of the conically expanding so that its diameter is larger than the original internal diameter of the pipe, while the extraction is carried out with the thinning and squeeze out the excess material of the pipe in the direction of movement of contrepoison, filling the material source, the gap between the mandrel and the pipe, between the pipe and the punch and the time interval of arbitrary shape. The mandrel can be made in the form of elongation on top of contrepoison, and the extension has a diameter corresponding to the diameter of the mandrel.

In a further implementation of the method will be illustrated using graphical material, where Fig. 1 schematically shows the initial and final stage of the process of radial extrusion, combined with the internal exhaust pipe with thinning carried out with the aim of obtaining a processing pressure of the hollow axisymmetric thin-walled parts are of non-uniform diameter having complex cross-sectional shape, and Fig. 2 shows the characteristic shape of parts that can literalism or mechanical press, having at least two, or preferably three independent actions.

The tube 1, the upper end of which was previously flared, insert in matrix 3, which is fixed on the table of the press. The punch 4 is lowered so that he was in contact with the surface of the matrix 3 and remained held a certain force F1, ensuring the preservation of hydrostatic pressure required in the area of A strain in which occurs the radial extrusion. Inside the punch 4 is freely movable mandrel 5, the diameter of which is smaller than the inner diameter of the pipe 1. Instead of free-floating mandrel can be used contrepoison with the elongation on the upper side, the diameter of which corresponds to the diameter of the mandrel 5. Stroke perform contrepoison 5, which is extended along an area Lp so that its diameter was larger than the initial inner diameter of the pipe. During the working stroke of the difference between the amounts received from thinning of the pipe wall is pushed forward by the plunger 4, filling first the original gap between the pipe 1 and the mandrel 5, and then under the action of hydrostatic pressure is filled in the gap B between the plug 4 and the mandrel 5. Dopolnitelnye 2, causes an additional increase of hydrostatic pressure in the zone to A value depending on the efforts of F1, which is held by the punch 4. In this case, the plunger 4 is pushed in the distance, the magnitude of which depends on the additional volume of material extruded by the punch 2. Depending on the desired shape of the workpiece blank period B may also be formed in the matrix 3. Adherence to the exact shape of the final part, determined by the form of the matrix 3, punch 4, contrepoison 2, mandrel 5 and moving contrepoison 2, can only be achieved if the hydrostatic pressure in the zone of deformation A, which is limited holding force F1 is large enough. Due to the high hydrostatic pressure in zone A may be opposite (relative to the direction of movement of contrepoison 2) for the pipe material. It can be prevented by providing the extended portion of contrepoison 2 relevant dimensions, in which the plot Lp is essential for the action of the friction force acting in the direction of contrepoison 2. In addition, the reverse movement of the material can be prevented with the use of fixed rest 6 to which the can is

In Fig. 2 shows three typical forms of details that can be obtained by this method. Cross-section to the left of the axes of symmetry characterize the workpiece before machining, and right after processing.

This method is characterized by the fact that during processing the workpiece length is practically unchanged, at a time when its diameter in some places increases, others decreases.

1. The method of radial extrusion, combined with the internal extractor with thinning of the pipe, having a pre-expanded upper part that includes the hood with thinning on the inner side of the cylindrical tail portion of smaller diameter and radial extrusion of the pipe section between the smaller and larger diameters, characterized in that the pipe is placed in the corresponding matrix, with the side of the flared part of the impact punch and hold it with a force sufficient to create a hydrostatic pressure at the radial extrusion, inside the pipe lead frame, floating in the punch, and on the opposite side of the pipe enter contrepoison, the diameter of the upper end of which is equal to the diameter of the mandrel, and a specified length from the top of the hood with thinning and squeeze out the excess material of the pipe in the direction of movement of contrepoison, filling this source material, the gap between the mandrel and the pipe, between the pipe and the punch and the time interval of arbitrary shape.

2. The method according to p. 1, characterized in that the use of the mandrel, made in the form of elongation in the upper part of contrepoison, and the extension has a diameter corresponding to the diameter of the mandrel.

 

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