Method of rolling surfaces of rotation
(57) Abstract:Use: for the manufacture of a wide range of parts with complex configuration of the side surface, for example, drives the car wheels. Essence: heated workpiece rotate on the heated mandrel and drive rollers, which are rotated in the process of forming parts, the rotation of the rollers carry around an axis which is tangential to the point of contact of the roller with the treated surface, which is located in the plane perpendicular to the axis of the workpiece. The invention improves the fidelity of the configuration of the workpiece, to increase the utilization rate of the material. 3 Il. The invention relates to the field of metal forming and can be used in the manufacture of a wide range of parts such as bodies of rotation with a complex configuration of the side surface, for example, drives the car wheels.A known method of manufacturing a rim for a wheel of the hollow cylindrical workpieces, secure and. C. N 1125084 MKI B 21 D 5/00, 1984, which includes the phased manufacturing complex profile of the lateral surface for three periods,>The disadvantage of this method is that it is uneconomical, additionally, when handling certain materials layer-by-layer rolling for several transitions is not possible to obtain a defect-free metal structure, resulting in deterioration of the mechanical characteristics of the part.The closest to the technical nature of the claimed method is implemented when the device for rolling, protected by the patent of Russia No. 2031753, B 21 H 1/02, 1995, selected as a prototype of the proposed method.The method includes installing a heated billet to send and rollers rotating workpiece deforming rollers that are mounted on the carriage with the possibility of rotation about the axis of the fixing roller to the carriage.The method extends rolling in more complex surfaces of the workpiece, however, to ensure accurate reproduction of the configuration of the treated surface, it is necessary to adjust the trajectory of the roller on the workpiece, to manage multiple coordinates through the displacement sensors and the Executive bodies, by adding a few moves to get rezultati processing, to the need for mechanical refinement and reduction of the rate of use of materials (KIM).The claimed invention solves the problem of simplifying the way and increase the fidelity of the configuration of the treated surface.The problem is solved in that in the method of rolling, comprising heating billets, installation, clamp, rotation of the heated mandrel and rollers rotating workpiece raschetnymi rollers that rotate relative to the treated surface in the process of forming parts according to the invention the rotation of the rollers carry around an axis which is tangent to the working surface of the roller, which is located in the plane perpendicular to the axis of the workpiece, the axis of rotation of the roller passes through the point of contact of the roller with the surface.The presence of distinctive features allows to make a conclusion on the conformity of the proposed method the criterion of "novelty".In the search process not identified technical solutions containing signs, similar to the distinctive features of the proposed method, which allows to conclude that the criterion of "inventive, Ural branch of the Rog axis, the tangent to the workpiece, in the implementation of feed rollers along the treated surface provides no additional movement path of the rollers corresponding to a given configuration of the product.In Fig. 1 is a diagram of the method implementation.In Fig. 2 - rolling deepening.In Fig. 3 - rolling ledge.The method is implemented as follows.The workpiece 1, is heated in an oven pre-heating was installed on a heated mandrel 2, pinched the support brackets 3 and the spindle 4 and led the workpiece during the rotation.The workpiece 1 continues to heat up. When the set temperature is reached, determined by the properties of the material subjected to rolling, it starts the process rolling. The workpiece surface is brought raskatnoe roller 5, is embedded in the metal (see Fig. 1), in plastic condition, distorts it, and when the movement of the roller 5 along the generatrix of the workpiece 1 redistributes part of the metal from one area to another to obtain the desired profile of the finished part. When forming the complex profile of the side surfaces of the part, the movement of the roller 5 is modified so that the result is to give the optimum conditions for the flow and the mechanical movement of the layer of metal, distributing it on the mandrel 2 with minimum power tool loads.The implementation of rotation of the roller 5 around the axis 7, which is tangent to the working surface 6 at the point of last contact with the treated surface provides a pure rotation of the roller around the treated surface. In this case, there is no displacement of the working surface 6 of the roller 5 horizontally and vertically in the plane of the processing that takes place in the prototype, when the rotation is performed about an axis spaced from the working surface, which leads to the displacement of the working surface 6 of the roller 5 on the arc of a circle and the rotation is combined with a change in position along the horizontal and vertical axes in the plane. Performing precise rotation of the roller without bias allows to obtain for one transition surface complex configuration with more precise execution of the specified profile, because no mistakes made in the correction of the movement of the roller during the rotation.The Institute method worked when the roll drive motor wheels. Disc blank with a pre-stamped inner surface pinched on the mandrel is heated to 500oC and carried out, see Fig. 3). This allowed us to roll out a complex surface of the rim 1 transition with high precision and to minimize subsequent mechanical rework, improve the utilization rate of the material. Method of rolling surfaces of revolution including heating billets, installation, clamp, rotation of the heated mandrel and rollers rotating workpiece raschetnymi rollers, rotatable about the workpiece surface in the process of forming parts, characterized in that the rotation of the rollers carry around an axis which is tangential to the point of contact of the roller with the treated surface, which is located in the plane perpendicular to the axis of the workpiece.
FIELD: plastic working of metals and alloys, possibly manufacture of large-size axially symmetrical parts for important designation, for example discs for gas turbine engines of multi-phase refractory alloys possibly on base of nickel and titanium.
SUBSTANCE: method comprises steps of rolling at controlling temperature and deformation rate at rolling in temperature range of super-plasticity; controlling temperature of rolled portion of blank and subjecting it to heat treatment; combining rolling process and out-of-contact super-plastic deformation of rolled portion of blank while selecting values of deformation rate at rolling and temperature of rolled portion of blank.
EFFECT: enhanced uniformity of material structure of part.
10 cl, 5 dwg, 1 tbl, 8 ex
FIELD: technological processes.
SUBSTANCE: blank is cut from sheet and curled in ring. Ends of blank is welded in a butt joint with provision of cylindrical shell. Disk profile is formed on part of shell by cold rolling with roller on mandrel in reeling machine. At the same time disk wall subject to adjacency with wheel rim is thinned. Then part of shell that is left from formation of disk profile is transformed by cold rolling into plane of disk seat that has central opening.
EFFECT: higher quality of item.
SUBSTANCE: invention relates to pressurised metal treatment, mainly, to plastic straining methods in round flat work pieces. The work piece is formed as follows: the work piece is subject to upset applying shear strain by means of translational movement and rotation of tool with regard to work piece symmetry axis. Then, the work piece is cut to the several round pieces subject to staining according to the above mentioned straining scheme.
EFFECT: invention results in uniform micro structure and physical and mechanical properties of work pieces around its diametre.
3 cl, 3 dwg, 1 ex
FIELD: processing engineering.
SUBSTANCE: invention relates to metal forming and may be used for production of gas turbine engine discs. Disc cylindrical billet is revolved to displace inclined rolls radially over the billet, said rolls making a preset pass. Rolls are displaced from billet edges to its axis to create contraction strain at all stages of forming.
EFFECT: development of contraction strain to eliminate pores, cracks and fractures.
SUBSTANCE: deformation of a peripheral part of a billet is performed by rolling with rolls at the superplasticity temperature in the deformation zone so that a sheet is formed. The central part of the billet is cooled down prior to rolling-off to the elastic deformation temperature. During the rolling-off process, the central part of the billet and the sheet subject to non-contact deformation is cooled down by action of a cooling medium on the central part. Cool-down of the sheet to its elastic non-contact deformation temperature is provided in a zone adjacent to the central part. Between the specified zone and the deformation zone, an intermediate zone is formed, in which temperature obtains an average value between elastic deformation temperature and superplasticity temperature and/or values close to the specified average value. In the rolling-off process, cooling medium pressure is increased with expansion of the cooled zone of the sheet. Intermediate zone temperature is maintained.
EFFECT: improving quality of manufactured parts and enlarging technological capabilities of their manufacturing method.
3 cl, 6 dwg, 7 ex
FIELD: process engineering.
SUBSTANCE: invention relates to metal forming and can be used for production disc-type parts from multiphase hard-to-strain refractory alloys. Workpiece is heated in the furnace to the temperature corresponding to temperature range of superplastic straining. Workpiece peripheral part is rolled off at superplastic straining made by rolls secured in elongator heads. Forming surface of the rollers is heated to the temperature not lower than that of crack formation on workpiece surface. Rolling-off is performed in the furnace space free of heaters wherein elongator heads are fed to the workpiece. Extending furnace is used provided with the shutter or permanent cutout provided with the shutter. Shutter opening amount is defined proceeding from the maintenance of workpiece temperature not falling beyond aforesaid temperature range of superplastic straining. Rolls are heated with the help of heated workpiece heat radiation.
EFFECT: higher stiffness of elongator heads, hence, higher precision of part production.
7 cl, 2 dwg
FIELD: mechanical engineering.
SUBSTANCE: method comprises the manufacture of steel disk with technological oversize on the outer diameter, its heating and plastic deformation of the ring-shaped disc section, which is intended for cutting teeth forming a gear wheel crown by moving relative to each other by mutual pressing of the roll and the workpiece as the at least one end. During the running exercise, the heating of the run-section is made, wherein the roll is moved in a plane parallel to the plane end blank with the center of its rotation relative to the workpiece coincident with the center of the workpiece, the width of the rolled section in a radial direction relative to the workpiece is chosen equal to the sum of the height of the gear ring, the width of the outer technological allowance and allowance for the width of the rolling circumference of the base ring gear toward the center of the preform.
EFFECT: improving of the mechanical characteristics of the gear due to the increase in mechanical properties of the workpiece for its manufacture.