A method of manufacturing a hollow axisymmetric parts type bottoms

 

(57) Abstract:

The invention relates to the processing of metals by pressure, in particular to a pressure processing rollers without deliberate thinning of the wall is a flat or bowl-shaped workpiece. First, a workpiece is formed into the Central portion of the bottom spherical shape, then the workpiece is mounted on a freely rotating spindle and the undeformed part of the billet rotary extrusion is formed into a curved section and a cylindrical side plate, and a rotary extrusion is carried out on the bearing roller spherical shape with a tapered skirt, the axis of rotation of which is set parallel to the axis of rotation of the workpiece plate, and the movement of the rolling roller carried out on the arc of a circle with the center of the sphere support roller. Rotary extrusion can be carried out simultaneously with changing the height and angle of inclination of the spindle with respect to the axis of rotation of the support roller or feed rolling roller in a radial direction relative to the scope of the support roller. Forming the Central part can be carried out by a rotary extrusion. Eliminates the marriage in the form of bumps and increases productivity by reducing the amount of equipment the second processing rollers without deliberate thinning of the wall flat or cupped blanks.

A known method of manufacturing an axisymmetric hollow parts of all sheet attached in the center of the rotating spindle, sequential deformation of individual sites by rotational extraction (see, e.g., auth.St. USSR N 441072, MKI B 21 D 22/18).

The disadvantage of this method is the necessity of using equipment with a significant size and weight due to high cantilever load in the manufacture of the bottoms of large diameter (6000 mm or more), you may not be able to achieve a high surface finish of the inner surface due to the formation of microsofr when pressing the processed plate to the surface of the mandrel formed by the cassette with a set of rollers of different configurations.

This deficiency is partially removed in the method of manufacturing an axisymmetric parts like the bottoms of flat circular in plan sheet of the billets, according to which, first, a workpiece formed by stamping the Central part of the bottom spherical shape, then the undeformed part of the billet rotary extrusion is formed into a curved section and a cylindrical side of the bottom, then on the peripheral part of the bottom of the crimping roller at an angle to the Central is for example, auth.St. USSR N 1704884, MKI B 21 D 22/18, 51/24).

However, this method has disadvantages, namely, that the inner surface has poor surface finish due to the fact that when rotary extrusion processing is done using imported supporting a drive roller that is deployed at a constant angle to the axis of rotation of the bottom. For the manufacture of the heads according to this method requires additional equipment and additional operation for forming the edges of the bottom.

In terms of total characteristics as the prototype of the method chosen the method according to ed. St. USSR N 1704884.

The objective of the invention is to improve the quality of products due to the exclusion of marriage in the form of bumps and increases productivity by reducing the amount of equipment in the manufacture of flat and spherical bottoms.

This object is achieved in that a method of manufacturing an axisymmetric parts like the bottoms of flat circular in plan sheet of the billets includes forming the Central part of the bottom spherical shape, setting a workpiece on a freely rotating spindle and forming on neoformans part of a curved section and a cylindrical bead lsout support roller spherical shape with a tapered skirt, the axis of rotation of which is set parallel to the axis of rotation of the workpiece plate and rotary extrusion rolling roller carried out on the arc of a circle with its center coinciding with the center of the sphere support roller. In addition, forming the Central part of the exercise by rotational extrusion, which is performed by simultaneously changing the angle of inclination of the spindle with respect to the axis of rotation of the support roller and rotary extrusion is performed with the flow rolling roller in a radial direction relative to the scope of the support roller.

Use as a support roller support roller spherical shape with a tapered skirt, the axis of rotation of which is set parallel to the axis of rotation of the workpiece plate, and implementation rotary extrusion rolling the roller along the arc of a circle with its center coinciding with the center of the sphere support roller allows for a single operation to produce a curved bottom surface and a cylindrical part. Due to regulatory efforts clamp knurled roller and the speed of rotation of the support roller is achieved the necessary amount of friction, eliminates the formation of microgap on external and internal surfaces of the bottom. In different rollers and at least 2 types of pressure rollers, and pressing equipment large capacity for pre-forming approximately half of the diameter of the workpiece to reduce the surface of the rotary hood curved part, the proposed method does not require sophisticated equipment. The method can be implemented on commercially available rotary machines of relatively small diameter. Another important advantage is the possibility of making a thin-walled spherical and torispherical heads of large diameter, although in a known manner to make them impossible due to the warping of the workpiece when moving from machine to machine (without this it is impossible to replace the set of reference and the pressing rollers). Thus, the proposed method provides better performance and high quality.

The implementation of forming the Central part of the rotational extrusion eliminates time-consuming in manufacture of press tooling and avoid crown material of the bottom, causing wastage of metal, since the calculation is carried out on the most subtle part of the bottom. It provides quality products.

Implementation rotary extrusion with the completion of the tion technology through crimping of the edges of the bottom without moving it on the calibrating machine rotary hood. This allows you to increase productivity in the manufacture of bottoms. In addition, the change in the angle of inclination of the spindle allows you to change the direction of shear deformation on the surface of the workpiece - the greater the angle, the greater the magnitude of shear deformation and at the same time lower the rotational speed of the extrusion. Thus, when rotary extrusion becomes possible to achieve the maximum surface quality even with considerable variation in physico-mechanical properties of workpiece materials.

Implementation rotary extrusion feed rolling roller in a radial direction relative to the scope of the support roller provides manufacturing bottoms of sheets of different thickness and different ductility of the material.

The invention is illustrated by drawings, which is shown in Fig. 1 shows the initial flat blank; Fig. 2 - the semi-finished product with a spherical Central part obtained by the method of rotating the drawing of Fig. 3 - the semi-finished product with proven curved part of the bottom; Fig. 4 - scheme of the seaming cylindrical edges of the bottom; Fig. 5 is a diagram of a rotary extraction using a vertical spindle, prefabricated diionno hoods when using a spindle with adjustable tilt angle: Fig. 6 in a vertical position, Fig. 7 - when removed from the support roller spindle, and Fig. 8 - when connected to the support roller.

A method of manufacturing a hollow axisymmetric parts like heads is as follows.

Round billet 1 from a sheet receiving one of the known methods, for example, by clipping on a disk shears, and out in the vertical machine is formed into the Central portion of the bottom spherical shape to which the workpiece 1 is clamped in a rotating mandrel on the perimeter and down mounted for movement along the radius of the pressing roller 5, as shown in Fig. 2. Then the workpiece is mounted on a freely rotating spindle 3 and the undeformed part of the billet rotary extrusion is formed into a curved section and a cylindrical side of the bottom. Rotary extrusion carry on is connected to drive rotation of the supporting roller 2 spherical shape with a tapered skirt, the axis of rotation parallel to the axis of rotation of the workpiece plate, and the movement of the rolling roller 5 is carried out by the arc of a circle with the center of the sphere support roller 2. The rotating extrusion plate, if necessary, carried out with a simultaneous change in the height spendalot by rotation on the horizontal axis of the hinge at the base with the Jack 4. Rotary extrusion is performed with the supply of the rolling roller 5 in the radial direction relative to the center of the sphere of the support roller 2 by moving it along the guide 6, which is mounted on the worm sector 7, interacting with a driving worm 8. By moving the guide 6 together with the rolling roller 5 in the radial direction establish such a gap between him and the supporting roller 2, while the magnitude of the gap pick up empirically, to prevent the formation of bumps and provide the necessary cleanliness of the surfaces of the bottom. For the formation of the side-plate switching cylinder 9 to move bed 10 with the attached nodes move the rolling roller 5 in a vertical plane, and to change the angle of carry out the reversal of the rotation of the screw 11 to move pressure roller parallel to the skirt of the rolling roller 2 or if necessary at an angle to the generatrix of the skirt.

Example. Manufacturer bottoms with a curved surface made of a round billet with a diameter of 1600 mm, cut on a disk scissors model N-4420 made of sheet steel of a thickness of 4-10 mm steel 12X18H10T. Installed on a dedicated machine with the diameter of the table 3200 mm ustroystva which is equal to 1400 mm, and rastaivaya Central hole with a diameter of 100 mm for mounting, centering and fixing the workpiece on the spindle axis obkatkoj machine. Obratnaya machine is installed above the rotary table of the machine stationary yoke, on which is mounted a spindle with the possibility of radial movement relative to fixed on the table support roller. On the walking beam of the machine install the fixture with mounted units move the rolling roller in concentric circles around the sphere, the support roller, the node radial movement of the rolling roller, and mechanism for changing the angle of inclination of the bed in the form of a screw. The vertical movement of the beam is performed by the drive beam boring machine, and moving the frame along with the rolling roller parallel to and at an angle to the axis of the support roller is performed by the hydraulic cylinder when the pivot frame at an angle by means of an adjusting screw.

The proposed solution provides quality products due to the exclusion of marriage in the form of bumps and increases productivity by reducing the number of transitions between the individual operations, but also reduces the number of the different parts of type bottoms of flat circular in plan sheet of the billets, including forming the Central part of the bottom spherical shape, setting a workpiece on a freely rotating spindle and forming on neoformans part of a curved section and a cylindrical side plate rotary extrusion rolling the roller on the support roller, characterized in that the support roller use the support roller spherical shape with a tapered skirt, the axis of rotation of which is set parallel to the axis of rotation of the workpiece plate and rotary extrusion rolling roller carried out on the arc of a circle with its center coinciding with the center of the sphere support roller.

2. The method according to p. 1, wherein forming the Central part of the exercise by rotational extrusion.

3. The method according to p. 1, characterized in that the rotating extrusion is performed with a simultaneous change of the height and angle of inclination of the spindle with respect to the axis of rotation of the support roller.

4. The method according to p. 1, characterized in that the rotating extrusion is performed with the flow rolling roller in a radial direction relative to the center of the sphere of the support roller.

 

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