SU822960A1 - Method of expanding shaped rings - Google Patents

Description

1 hour

The invention relates to the processing of metals by pressure and can be used when rolling rings of a multistage profile with wide inner and outer flanges.

There is a method of rolling profile rings in a matrix with a caliber on the end surface, in which a section of the workpiece, located in the matrix, is rolled out with an internal roller, reducing the working gap between the roller and the matrix while maintaining the axes of the latter parallel, changing the relative position of the axes of the inner roll and the die until the matrix caliber is filled with the metal flj.

The disadvantage of this method is the dependence of the width of the inner flange being formed on the wall thickness of the original billet and the finished part; therefore, it is impossible to obtain internal flanges with a ratio of width to height more than 1.5-2.0, which limits the technological capabilities of the method.

In addition, the inner flange is not deformed in height. This leads to non-uniformity of mechanical properties over the section of the workpiece and reduces its quality.

The closest to the proposed technical essence and the achieved result is a method of rolling the profile rings in the matrix,

0 according to which the internal tool is installed at an angle to the axis of the matrix, the section of the workpiece is placed in the matrix with the tool moving the last of the last relative to the workpiece and subsequent rotation of the tool relative to the workpiece when the parts of the workpiece 12 are deformed.

0

The disadvantage of this method is its limited technological capabilities. This method can be used to obtain rings, mainly, of a single-stage profile. In addition, when forming a billet according to a known method, considerable rolling forces are required due to the large contact areas between

Claims (2)

0 workpiece and tool. The purpose of the invention is the expansion of technological capabilities through races. rollers of the rings of a complex-step profile and reduction in the effort of deformation. ° The goal is achieved by using a tool formed by two truncated cones, which is moved along a line passing through a point coinciding with the apex of the inner corner of the profile of the finished ring, and a point coinciding with the outer corner of the original Workpiece in its radial section, until the large base of the tool cones is aligned with the apex of the internal angle of the profile; ring blanks with a profile height equal to if25-2.5 of the matrix profile height are used for rolling. In addition, in the process of deforming the parts of the workpiece projecting: beyond the matrix, simultaneously with the rotation of the tool, the matrix is rotated with the workpiece. By moving the tool along a line passing through a point that coincides with the apex of the internal angle of the profile of the finished ring, and a point that coincides with the external angle of the original workpiece in its radial cross-section, a uniform reduction of the internal profile is achieved. The conical shape of the tool reduces the force of deformation during rolling by reducing the contact area between the tool and the workpiece. The annular billet is chosen with a profile height equal to 1.25-2.5 of the height of the matrix profile. This value is selected on the basis of a predetermined wall thickness and width of the cylindrical part of the finished ring formed on the portion of the matrix that has the smallest internal diameter. Figure 1 shows the position of the workpiece and the tool at the beginning of rolling; Fig. 2 shows the same at the moment the workpiece is rolled into the die cavity and the roll feed stops; in FIG. 3 - the same, at the end of the rotation of the roll when forming the inner flange of the workpiece; 4 - the same, at the end of the rotation of the roll when forming the outer flange of the workpiece. I An annular billet 1, cut from a hot-rolled pipe with a diameter of 21 and a profile height of 26 mm, of steel 20, 44-0.5 mm wide, is heated to 900 ° and placed in a matrix 2 with internal diameters of 242 + 0.1 and 220 +0.1 mm, with a profile height H „equal to 11 mm, a width of 20 and 12 mm, respectively. The rolling process starts with the tool 3 inlet, the working surface of which is formed by two truncated cones facing each other with large bases, the diameter of which is 70 mm, and the angle at the apex ot 90. The roller is set at an angle of 45 relative to the die until it touches the workpiece at point A, after which he is informed of the rotation that is transmitted to the workpiece and the die. The number of revolutions of the roll per minute is 24. The parameters of rolling: the greatest force on the tool is 25 ton-force, a single reduction of 2 mm / rev. The roll is fed along axis 1-1 passing through point B, which coincides with the apex of the internal angle of the profile of the finished ring, and point A, which coincides with the external angle of the original billet, until the large base of the tool cones is aligned with point B, then the internal flange is rolled rings by rotating the tool and the matrix along arrows G and D around the axis passing through point E, which is the top of the outer corner of the inner flange of the finished ring, at an angle of 45 at a rate of 0.1 1 / e. After forming the inner flange and the cylindrical section of the ring with a diameter of 220 mm and a length of 12 mm, by turning the tool and the matrix along the arrows Ж and И around the specified point, they are returned to their original position at a speed of 0.5 1 / s. Then, in the same direction (along the arrows G and I, but near the axis passing through the point K, which is the apex of the outer corner of the outer flange, the instrument and the die are reciprocally turned at a speed of 0.1 1 /. The tool and die are returned to their original position, the tool is retracted, and the part is pressed out of the die. The manufactured part has the following dimensions, mm: Outer flange diameter Outer flange thickness 10 + 0,2 Inner flange diameter 226 +3,0 Inner flange thickness 12 + 0 , 3 Outer diameters parts 242 + 0.1 220 + 0.1 Inner diameter of part 200 +2.0 Part height 40 i 0.5 Using the proposed method allows to obtain parts of a two-stage profile, to ensure minimum allowances for machining. Formula 1. The method of rolling profile sections in the matrix by setting the inner tool at an angle to the axis of the matrix, rolling the section of the cooking & located in the matrix with the tool moving the latter relative to the workpiece and then turning the tool relative to the workpiece while deforming These sections of the workpiece protruding beyond the matrix are distinguished by the fact that, in order to expand technological capabilities and reduce the deformation force, for processing, use a tool formed by two truncated cones, which are moved along a line passing through a point coinciding 4PM / with the top of the internal angle of the profile of the finished ring, and a point coinciding with the external corner of the original workpiece in its radial cross-section, before combining the large base of the tool cones with the top of the internal corner of the profile , Wherein the ring used for rolling billets with height profile equal to 1,25 2,5 of the height profile of the matrix. 2. The method of rolling the core rings POP.1, characterized in that in the process of deforming the parts of the workpiece protruding beyond the matrix, simultaneously with the rotation of the tool, the matrix and the workpiece are rotated. Sources of information taken into account in the examination 1. USSR author's certificate number 574258, cl. B 21 N 1/06, 05.04.76. 2. USSR author's certificate for application number 2599612 / 25-27, cl. B 21 N 1/06, 10., 04.78. FagL