The way the plastic structure of metals by severe plastic deformation and device for its implementation

 

(57) Abstract:

The invention relates to the processing of metals by pressure, in particular to the preparation of material for further processing methods of forming processes. For plastic structure formation of metal blanks first produce a closed draught, and then reverse and direct extrusion with one end of the workpiece. Then repeat the process with the other end of the workpiece. These operations die forging is carried out in a device that contains two punches and dies. One of the punches is made hollow with a circular inner edge at one end. Within the above-mentioned punch is the second punch. The matrix, in which a workpiece is set on the plate with a rough surface. The result is the preparation of nanocrystalline metal structure in fewer processing cycles by increasing the degree of deformation per cycle and the average size of the workpiece. 2 C. p. F.-ly, 4 Il.

The invention relates to the processing of metals by pressure, in particular to the preparation of material for further processing methods of forming processes.

Known sposobem [1]. The method is as follows: the workpiece mounted on the stationary bottom plate of the press, then it is exposed to the upper plate of the press, moving the workpiece, which (stove) simultaneously performs translational motion, producing a draft of the workpiece and the rotation - torsion of the workpiece.

The known method and apparatus for pattern formation metals by rolling them between two or more smooth rollers of large diameter [2]. The method is as follows: the workpiece is fed into the space between two smooth rotating forks, she is captured by them and is subjected to rolling between them, i.e. the reduction of the same size due to the increase of the other two. If required, the workpiece is subjected to repeated rolling between rollers set with a smaller gap, to further reduce the size of the workpiece.

The known method and apparatus for pattern formation metals by equal-channel angular pressing, containing a node for deformation, with two reported channel, one of which is blank, and the site for loading, by means of which push the workpiece into the second channel, while Kahn the workpiece [3].

The known method of the plastic structure formation of high-strength materials, including multiple extrusion and upsetting of the billet with the preservation of its original shape and size after each cycle of deformation in each subsequent cycle the extrusion direction is changed to the opposite relative to the direction of extrusion in the previous cycle [4].

The closest in technical essence and the achieved effect is a well-known method of pattern formation of high-strength materials "hourglass", in which a cylindrical metal billet in a cold state is subjected to the direct extrusion and upsetting several cycles [5] . The method involves the repeated deformation of the workpiece with the preservation of its original shape and size after each cycle of deformation, and the deformation of the workpiece in each cycle carried out by extrusion with subsequent simultaneous draft extruded part, in each subsequent cycle of deformation of the extrusion direction is changed to the opposite relative to the direction of extrusion in the previous cycle.

The disadvantage of this method is abreaction device for implementing the method is a device for plastic structure formation, containing the actuator, the matrix, made with two working channels of the same cross section and length, the punch and contrepoison, and the matrix is made on movable in the axial direction of the plate and mounted to rotate together with the punch and contrepoison 180othe channels of the matrix are aligned and communicated with one another by a smaller cross-section forming a channel for extrusion, and the actuator is made of a hydraulic cylinder, a plunger which is installed with the alternate engagement with the punch or contrepoison and housing - matrix [5].

The objective of the invention is the preparation of nanocrystalline metal structure in less number of cycles of processing a metal workpiece by increasing the degree of deformation per cycle and the increase of the dimensions used for processing of the workpiece.

For this method plastic structure formation of metal blanks by the method of forming processes, including direct extrusion and closed draught, first produce a closed draught, then do a reverse extrusion direct extrusion with one end of the workpiece, and then Automania metal blanks, contains two punches and dies, in which one of the punches are hollow with a rounded inner edge at one end and within which is located a second punch, equipped with a plate with a rough surface, on which the matrix inside the workpiece.

In Fig.1 shows a device for implementing the method;

in Fig.2 shows the first stage of the process (closed sludge);

in Fig.3 shows the second stage of the process (backward extrusion);

in Fig.4 shows the third stage of the process (direct forcing).

A device for implementing the method comprises a back plate 1, on which the workpiece 2, matrix 3, the hollow plug 4 with rounded inside edges to facilitate extrusion of the metal, bandainamco matrix 5, mounted on the plate 1, the punch 6. The plate 1 is made with a high surface roughness to avoid lifting of the matrix 3 and the flow of metal from under her. The second punch 6 is located inside the hollow plug 4.

The method is as follows.

Metal round or with a different profile, the workpiece is placed in a matrix of 3 placed in bandainamco matrix 5 to upgradee specific efforts sufficient to fill the voids. Then do a reverse extrusion of metal by applying a force P to the edges of the punch 4. By the passage of metal about 90% of the distance from the height of the hollow punch reverse bump stop and produce direct extrusion punch 6, applying thereto a force P, to match the lower surfaces of the punches 6 and 4. Then the process is repeated a desired number of times, after which the plungers 6 and 4 extract, matrix 3 is turned 180omove the workpiece until contact with the plate 1 and the process produce again.

Sources of information:

1. The motion of matter in Bridgman anvils at high pressure in combination with shear strain /Century A. Zhorin, A. A. Zharov, A. G. Kazakevich, etc. // solid state Physics, 1975, I. 17, vol.2. - S. 395-398

2. Forging and stamping: a Handbook. 4 so/Ed. tip: E. I. Semenov (PREV. ) and others - M.: Mashinostroenie, 1986. - T. 2. Hot stamping/Ed. by E. I. Semenov, 1986. 592 C., Il. ..387.

3. A. C. 492780 the USSR, MKI 3 G 01 N 3/00. Device for hardening material pressure /C. M. Segal, C. Y. Schukin (USSR). - 1924516/25-28: Declared 11.06.73. Publ. 23.02.76. Bull. 43.

4. Patent 2116155, Russia, MKI 6 In 21 J 5/00, 21 D 7/13. The way the plastic structure formation CF, MCI 4 23 J 5/00. The way the plastic structure formation and device for its implementation /Amirov M,, Greshnov C. M., Golubev, O. C. , Lavrinenko Y. A. Application 4763954/25-27 from 4.12.89, publ. 22.02.92, bull. 23.

1. The way the plastic structure formation of metal blanks by the method of forming processes, including direct extrusion and closed draught, characterized in that the first produces a closed draught, then do a reverse extrusion direct extrusion with one end of the workpiece, and then repeat the process with the other end of the workpiece.

2. Device for plastic structure formation of metallic workpieces with two punches and dies, characterized in that it is provided with a plate with a rough surface, on which the matrix is located inside the workpiece and one of the punches are hollow with a rounded inner edge at one end, within which is located a second punch.

 

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