SU721245A1 - Method of producing steel articles such as sleeves - Google Patents

Description

I

The invention relates to the field of metal forming, in particular to methods for glass products.

There is a known method of extruding parts such as a glass with a thick bottom from a bar stock, which includes heating the workpiece to the deformation temperature, punching the workpiece, first-pressing and. second extrusion.

The disadvantage of the known method lies in the low quality of the surface quality of the products caused by intensive calcification, as well as in the low productivity of the process caused by the presence of three guitar transitions.

The closest technical solution to the present invention is a method of manufacturing steel products such as a glass with a conical junction to the bottom from a billet of a smaller diameter than the outer diameter of the product, including heating the billet and squeezing it.

The disadvantage of this method is the low quality of the side surface of the product.

in view of the wide variation in physical and mechanical properties both in length and in cross section.

The aim of the invention is to improve the quality of products by increasing the physical and mechanical properties.

This goal is achieved by the fact that according to the proposed method, the billet is heated to a temperature of 600-700 ° C at a speed of 50 - 60 ° 1 / s, and simultaneously with the extrusion of the material, the reduction of the billet with a reduction rate of 0.5-3.0%, extrusion is carried out with back pressure.

The attached parameters are optimal for providing high-quality production of steel products and are revealed during the research process.

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Fig. 1 is a flowchart for transforming a blank into a product; in fig. 2 is one of the phases of pressing the workpiece.

The method is carried out as follows.

Claims (2)

The workpiece 1 is heated to the desired temperature by high frequency currents, after which the heated workpiece is introduced into the lead-in portion of the container 2. By the axial force of the press stamp 3, the workpiece is depopulated due to its interaction in reducing 4, reducing {1e / diameter of the workpiece in the lower part of the container and creating a zone of deformation of direct extrusion above the end of the subpusable punch 5. With its drawing pattern. The stamp blank is extruded into the gap formed by the conical surfaces 6 and 7, performed respectively on the container 2 and the lower punch 5. The inner corner, lying to the bottom of the product, is taken as the base, and the angle of the inclined surface, on the container is determined from the ratio D. - where D (is the diameter of the container in the lower part; Dp is the diameter of the body of the stationary punch; d is the diameter of the working end of the stationary punch; h is the height of the conical yiTcKa of the stationary punch. The surfaces are equal to in each normal annular cross-section, areas with near-zero forces on the outer side surface 7 and minimal radial forces on the surface 6. Dependence for determining the internal radial forces acting on the surface of the fixed punch (on morning the surface of the workpiece), has the form b 2Ztgo P "where -s31 (3 - kozffitsient 1,115; - yield strength of the deformable material; Z - the current coordinate with the origin from the end of the punch. Further action of the press stamp 3 produces the formation of a cylindrical piece of glass type product and the calibration of the surface of the product in rigidly limiting contour 8 and 9 and the application of supporting forces. Retaining forces can be provided by means of a hydraulic or pneumatic cylinder, or by means of achieving taper on the riya fcona stem. Thus, for strongly adhering curved materials, the specified conicity of the mouth is 2-3 °. Next, a press imbel holds the resulting product, the container 2 is retracted, freeing the outer surface of the part. Then the ram 3 with the container 2 is retracted upwards and the axial movement of the puller 10 is removed from the stationary punch. Conducted the manufacture of the product type glass from billet with a diameter of 31 mm and a length of 45 mm of steel 11YU. The billet is agregaln up to a temperature of 600 ° C at a rate of 60 ° 1 / s with high frequency currents. After that, the billet was placed in a container and the deformation - extrusion with a press-hemp was performed. In the extrusion process, the workpiece was reduced. After withdrawing the press stamp, the finished product was removed from the tool. The result was a product with an outer diameter of 39 mm and a length of 60 mm. The thinness in the resulting product was 0.08: 0.12 mm instead of 0.3-0.4, as was the case in the manufacture according to known technology. The invention The method of making steel products of the type of glass with a conical transition to zmy from a billet of a smaller diameter than the outer diameter of the product, including heating the billet and squeezing it, characterized in that, in order to improve the quality of the products by improving the physicochemical properties, the billet Heated to a temperature of 600-700C at a rate of 50-60 ° / sec, and simultaneously with the extrusion, the workpiece is reduced with a reduction rate of 0.5-3.0%, while extrusion is carried out with back pressure. 1 /, ui.2