Method of making ultrafine semis by drawing with twisting

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used in making semis or rods and wire with ultra fine structure. Proposed method comprises deformation of long metal by drawing via two aligned and fixed tape dies with extra shearing by simultaneous alternating bending and twisting about metal lengthwise axis. Note here that metal axial speed and that of its rotation in area between fibers are kept constant.

EFFECT: expanded processing performances, higher physical properties.

1 dwg, 1 tbl

 

The invention relates to the processing of metals by pressure and can be used in the manufacture of semi-finished or rods and a wire with ultrafine-grained (UMP) structure and improved physical and mechanical properties of metallic materials due to the combined deformation processing.

Known methods of producing ultrafine-grained (UMP) blanks, including the deformation of the material in an intersecting channels by severe plastic deformation (SPD). The most widely SDI by equal channel angular pressing (pressing) of the workpiece without changing its cross-section, including punching of the workpiece through two intersecting channel with the same cross section, in which due to the plastic structure formation materials is the improvement of physico-mechanical properties of the workpiece. It is possible to rotate the workpiece or the machining tool around its axis or the axis of the workpiece (Wmel, Vigaplus, Viesnica. A plastic structure formation metals. Minsk: Science and technology, 1994, p.26; RF Patent №2021064, RF Patent №2188091, RF Patent №2268100).

The disadvantages of the known methods is the difficulty in ensuring the integrity of the procurement process it is processed at high plastic strains,as well as the inability to handle long items with UMP structure.

The closest analogue to the declared object is a method for UMP half-finished drawing of the shift, including the deformation of metal by the application of pulling forces through two consistently placed on the conical drawing dies with simultaneous rotation of one of the fiber providing additional strain offset by a specified relative to the axis of rotation of the eccentrically formed through the tapered fiber channel (RF Patent No. 2347633).

The disadvantages of this method is the limited level of deformation effects for loop, which does not allow significant total deformation, and accordingly, narrowing the possibility of the formation of UMP material structure.

The technical problem solved by the claimed invention is empowerment deformation processing of long UMF semi-finished products due to the additional alternating bending with rotation of the metal in the zone between the centers of deformation.

The problem is solved in that in the known method to produce ultrafine-grained semi-finished products have been presented with a shift involving metal deformation by application of pulling force via two series-arranged tapered drawing dies, according to the invention the metal deformation produce posledovatelno coaxially fixedly mounted first and second dies, additional deformation by shear provide in the area between portages simultaneous alternating bending and rotation of the metal around its longitudinal axis, while moving velocity of the metal in the axial direction and its rotation around its longitudinal axis constant support.

The invention is illustrated in the drawing.

An example of the method.

Steel wire with an initial diameter d0dressed in the first course of its movement fixed conical rummaging and then sent, for example, in a system of rollers, providing alternating bending wire. Then she, after having first portages diameter d1<d0comes the second fixed located coaxially with the first conical fibrous smaller diameter, after which the wire has a diameter of d2then consolidate its front end in the winding device. After this process is sequential combination of metal deformation by drawing cone coaxially located and fixed first and second portages due to the pulling force generated by rotation of the winding device. Simultaneously with the deformation of the lug in the area between portages produce additional deformation of the shift, for example, for the odd rotation system of rollers around the longitudinal axis of the metal, providing joint alternating bending metal and its rotation around its longitudinal axis. Moreover, in the process of continuous deformation of the metal of the speed of its movement in the axial direction and rotation around its longitudinal axis constant support.

In the deformation processing wire according to the claimed technology in the wire increases as the strength and plastic characteristics. The average level of metal properties compared with the known method the deformation processing is 19-34%.

The processing conditions used for the drawing of a wire with its alternating bending, and rotation around its longitudinal axis, and the obtained results are presented in the table.

Table
The wire diameter of the source, d0mmWire diameter, after the first drawing dies, d1mmThe diameter of the wire, after the second drawing dies, d2mmSteel gradeTotal compression, ε, %The rotation speed of the wire, R/minSoon the efficiency of the lug, m/minMechanical properties
σt, MPaσin, MPaδ100, %
3,5*3,002,70steel 2023-1406479902,6
3,0**2,702,4219616082315201,9
3,5**3,102,7721814084615801,5
* drawing without alternating bending and rotation metal
** drawing with alternating bending and rotation metal

The claimed method combined Defoe the information of long workpieces due to the simultaneous alternating bending metal and its rotation around its longitudinal axis in the area between portages allows to provide for a series of processing large amount of deformation. However, due to the large shear deformations in the processed metal is formed ultrafine-grained (UMP) structure with improved physical and mechanical properties, which significantly extends the capabilities of the combined deformation processing. Based on the above, we can conclude that the proposed method is efficient and eliminates the disadvantages occurring in the prototype.

A method of producing semi-finished products with ultrafine-grained structure by dragging with the shift involving metal deformation by application of pulling force via two series-arranged tapered portages, characterized in that the deformation of the metal produce consistently coaxially fixedly mounted first and second dies, the additional deformation by shear provide in the area between portages simultaneous alternating bending and rotation of the metal around its longitudinal axis, while moving velocity of the metal in the axial direction and its rotation around its longitudinal axis constant support.



 

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