SU1486201A1 - Method of hot pressing of steel articles - Google Patents

Description

The invention relates to the processing of metals by pressure and can be used in the manufacture. By pressing the shaped profiles. The purpose of the invention is to increase the yield due to the absence of sticking of metal on the surface of the sleeve of the container and reducing the complexity by eliminating cleaning the container. The workpiece 1 with a thickening (U) 3, covered with a layer of scale and intended for the press residue, lead into the sleeve (B)

5 of the container, and when crimping Y 3 with a cone 6 V 5, pressing the scale in U 3 takes place, reducing its size to the size of the hole B 5. At the same time, the end 3 U is being cooled down

and adjusting the position of the workpiece 1 to align with the pressing axis with the formation around the main part of the annular cavity 10, in which during the precipitation process a center of increased air pressure is formed that prevents the pressing material from sticking on the surface B 5 when pressing through the matrix 9. Air is gradually released through the microchannels formed by the mating unevenness of the surface B 5 and the surface of the end of the workpiece 1 covered with a layer of scale, reducing the friction coefficient between them and reducing the force n ressovaniya. At the same time, the layer of pressed scale, possessing abrasive properties, cleans B 5. The thinned metal layer with scale in the area adjacent to the press washer 8 has a low ductility preventing it from flowing into the gap between B 5 and the press washer and sticking to them surface. The method eliminates the cleaning operation In 5 and the need to manufacture for this special tool. 3 il.

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The invention relates to the processing of metals by pressure and can be used in the manufacture of press-. shaped profiles.

The purpose of the invention is to increase the yield due to the absence of sticking of the metal on the surface of the sleeve of the container and reducing labor intensity by eliminating cleaning of the sleeve of the container.

FIG. 1 shows the installation of the workpiece in the sleeve of the container before pressing; on .fig. 2 - the position of the workpiece in the process of pressing; in fig. 3 - pressed workpiece.

The method is implemented on workpieces 1, having the main part 2 and the edge section 3, using a device having a tray 4, a container sleeve 5 with a lead-in part (cone) 6, a press-stamp 7, a press washer 8 and a matrix 9. The position 10 denotes an annular cavity - air gap between the surface of the main part of the workpiece and the sleeve of the container.

The method is as follows.

The heated billet 1, consisting of the main part 2, formed by removing the surface layer and the edge section 3, intended for forming a press residue in the pressing process and covered with a layer of undoled ooze from the previous conversion, is placed on the tray 4 in front of the container sleeve 5, which has a lead-in housing 6, and through the press stamp 7 through the press washer 8 lead into the cavity of the container. When crimping the thickening 3 of the billet with a cone 6, pressing the scale into the thickening of the billet takes place, reducing its size to the size of the opening of the sleeve 5, and when pressing the thickening 3 from the sleeve 5 and the press washer 8, it is cooled. In addition, when compressing the thickening 3, the position of the workpiece is adjusted to align with the pressing axis to form an annular cavity around its main part 9. Before the draft is deposited, the workpiece moves along the container, increasing the degree of sub-protrusion of the protrusion 3. preventing sticking of the pressed material to the surface of the sleeve. 5, and when pressing through the matrix 10

the air is gradually released through the microchannels formed by the mating irregularities of the surface of the sleeve 5 and the surface of the workpiece end covered with a layer of dross, reducing the friction coefficient between them and reducing the pressing force. In this case, the layer of pressed scale, possessing abrasive properties, cleans the container during the pressing process. In addition, under metal layer, covered with scale, is located in areas of the workpiece adjacent to the belt washer 8, has reduced ductility, preventing it from flowing into the gap between the cylindrical surfaces of the press washer and sleeve and sticking on their surfaces. After the end of pressing, the area of the workpiece covered with dross remains in the press residue going to waste.

Example. For pressing on a horizontal pipe-profile press with a force of 2000 tons with a container sleeve 0 180 mm, a billet 600 mm long was used with a non-finished end 50 mm long 182 mm, i.e. with a diameter equal to the diameter of the billet previous hot-rolled redistribution with non-removed scale.

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 In the process of precipitation and pressing the air from the annular cavity is vented through the final part of the workpiece. ”The analysis of the sizes of the pressed products showed that the surface quality of the press products improved by reducing the number of defects associated with the presence of shroud and scoring arising from the presence of scale in the container sleeve. Inspection of the hole of the sleeve after pressing showed the absence of scale in it and metal adhered to the surface of the hole.

Thus, the use of this technical solution in pressing steel profiles will increase the yield by improving quality, reduce labor costs for the manufacture of blanks, the operation of dividing the press washer with the press residue and eliminates the cleaning operation of the container and the need to manufacture for this special cutting tool due to use

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the abrasive properties of scale itself.

Claims (1)

The method of hot pressing of steel products, which involves making the blank with the main section and the edge section to form the press residue, heating it, installing it into the container sleeve and deforming it through the matrix, so that increase the yield due to the absence of sticking of metal to the surface container liners and labor reduction bones by eliminating cleaning container, from the surface of the main of the blank section, a layer of constant thickness is removed; when installing the blank into the container sleeve, the edge portion of the blank is compressed and the approach · 10 live, between the hub of the container and the surface of the main part of the workpiece form an air gap, and the deformation is carried out with increasing pressure in the air gap. FIG. 2 figs Make up V. Borozdin