The rotational hoods hollow axisymmetric parts

 

(57) Abstract:

The method relates to the treatment of metals by pressure and can be used in the manufacture of hollow axisymmetric parts from high-strength steels. Source deform the workpiece on a rotating mandrel multiple tapered rollers. Continuous deformation zone is divided into several zones, sequentially along the axis of the mandrel and inclined to it at different angles. The angle increases from the beginning to the end of the hearth. The rollers are of equal radial load. For this, they displace in the radial direction. The amount of displacement determined from the total deformation on the treated area and the geometric parameters of the rollers. The top of the roller cones are placed in the same plane perpendicular to the axis of rotation of the mandrel. The result is high quality items in one pass. 1 C.p. f-crystals, 4 Il.

The invention relates to the field of metal forming, namely the manufacture of hollow axisymmetric parts from high-strength steels with a high degree of deformation, as well as aluminum and other alloys. These items are widely used as thin-walled gerotechnology requirements imposed on such products, are providing high structural strength and reliability with minimum weight characteristics, and therefore the details are thin-walled shell with a wall of variable thickness with high dimensional accuracy.

A known method of manufacturing a hollow axisymmetric parts, including rotating the hood of the original piece on a rotating mandrel multiple videos of the same work profile, located in one plane perpendicular to the axis of rotation of the mandrel, and installed at the same distance from the surface of the mandrel [1]. This method is widely used in the domestic industry in the production of, for example, thin-walled parts with a length of 1000 mm and a diameter of 700 mm wood thickness up to 9-14 mm

The method does not provide the required reliability of the products with a wall of variable thickness in the operation process, which is explained by the fact that in the process of deformation of highly ductile metals are formed nodules, and, as a consequence, there is an increase in the actual degree of deformation, leading to barenklau and surface defects, which reduces the reliability and accuracy of the and roller and the feed rate leads to less accurate Diametric sizes (the phenomenon of "rolling") and errors of geometric shapes (out-of-roundness and curvature). All of the above limits the use of the method only for making non-critical parts of the assignment.

There is also known a method of manufacturing a hollow axisymmetric parts, in which the rotary hood original piece carry on a rotating mandrel multiple tapered rollers arranged in one plane perpendicular to the axis of rotation of the mandrel [2].

This method cannot be applied to rotary exhaust parts with variable wall thickness in one operation.

Known rotational hoods hollow axisymmetric parts, in which the source deform the workpiece on a rotating mandrel multiple tapered rollers in a continuous deformation zone with breeding it into several zones, sequentially along the axis of the mandrel and inclined to it at different angles with increasing angle from the beginning to the end of the deformation zone [3].

The known method cannot be used for rotary exhaust parts with variable wall thickness in one pass, because the equipment used allows the necessary in this way, the axial displacement of the rollers only by adjustment with the settlement of the workpiece load on each roller will not be equal, which leads to the radial displacement of the mandrel with the item and, consequently, to the reduction of the manufactured parts.

Technical problem which the claimed invention is directed, is the expansion of technological capabilities by providing manufacturing in one pass high-quality parts with variable wall thickness.

To solve the problem in a known rotational hoods hollow axisymmetric parts, in which the source deform the workpiece on a rotating mandrel multiple tapered rollers in a continuous deformation zone and split it into several zones, sequentially along the axis of the mandrel and inclined to it at different angles with increasing angle from the beginning to the end of the deformation, the deformation is carried out at equal radial loads on each roller by moving rollers that interact with each zone relative to the rollers interacting with other zones in the radial direction by an amount calculated values of total strain on the treated area and the geometric parameters of each clip, with the vertices of the cones is ha deformation of the workpiece to form multiple clips with the same geometrical parameters.

The invention is illustrated by drawings, where Fig. 1 presents a diagram of the deformation zone of the original piece by three rollers with different geometrical parameters of Fig. 2 - arrangement of rollers, mandrels and details of the deformation process; Fig. 3 - scheme of deformation of the three rollers, two of which have the same geometrical parameters of Fig. 4 - piece.

The processing details of the proposed method is as follows. On frame 1 set the source of the workpiece 2 and result in a joint with her rotation. Deforming rollers 3, 4, 5 is reduced in the radial direction with a mutual offset relative to each other, ensuring equality radial loads F1, P2, P3 on each roller in the deformation process on the treated area, i.e. P1 = P2 = P3. The vertices of the cones are located in the same plane perpendicular to the axis of the mandrel. In the event of axial movement of the rollers with the working flow S carry out the deformation of the workpiece with the original wall thickness t0to the wall thickness of the finished piece t1on the treated area, providing a total thinning of the wall of tsum.1= t0- t1. When this mutual displacement of the rollers in the radial direction II, III, is inclined to the axis of the piece from different angles, respectively1,2,3. .

The magnitude of the thinning of the wall in each zone t1, t2, t3provide relative position of the rollers in the radial direction, on the basis of the creation of equal radial loads on each roller on the treated area of the sheet and are determined by calculation using the existing dependencies to determine the radial forces.

Similarly carry out the deformation of any plot details, while changing the relative position of the rollers during processing is performed automatically from semi device when the processing equipment with semi devices, or by using the control program when the processing equipment with numerical control.

After processing all the sites details rollers assign to its original position and carry out the removal of components from the mandrel, and then mounted on the mandrel particular workpiece, and the loop repeats.

When used in a three-roller kit two clips with the same geometric PA is inclined at angles to the axis of the piece1and 2when this area I form one roller, and zone II - two identical rollers. The value of the mutual displacement of the roller, which forms a zone I, and two rollers, which form the zone II, is set as in the previous case, based on the conditions of creation of equal radial loads on each wheel in the deformation process, while the rollers which form the zone II, set without displacement relative to each other.

The rotational hoods hollow axisymmetric parts is as follows.

Example. Rotary extractor body parts with an inner diameter of 285,3 mm + 0,68 total length of part 1900 mm, with several cylindrical sections B, d, f with a wall thickness of 2.2 mm 0,2; 4.4 mm 0.2 mm; 2.2 mm 0,2, as well as transitional conical sections a, c, e, h with variable wall thickness, were made from cylindrical hollow tubes with a wall thickness of 6.3 mm and an inner diameter of 285,6 mm

The deformation of the workpiece mounted on the rotating speed n = 150 min-1the mandrel is produced by three rollers 3, 4, 5, arranged in the same plane, and a roller 3 formed area 1 floor angle -15o, roller 4 zone II angle -20o, roll the I rollers in the radial direction to contact the surface of the workpiece, all three roller in a position where the distance from the mandrel to the top of each clip was equal to the thickness of the original piece t0= 6,3 mm Then enabling axial cutting feed S = 150 mm/min was formed by a conical transition section a length of 20 mm with variable wall thickness of 6.3 mm at the beginning of the plot to 2.2 mm in the end, each roller was produced by the deformation of the wall of the workpiece from zero at the beginning of the deformation on the amount of wall thinning, which is calculated from the condition of equality radial loads (force deformation) on each roller, i.e., the total reduction was changed from 0 to 4.1 mm

When processing a cylindrical section b length 585 mm with a constant wall thickness of 2.2 mm deformation was carried out in a fixed position rollers with thinning of the wall of each roller .

Deformation following conic section c length of 10 mm with variable wall thickness of 2.2 mm at the beginning of section 4.4 mm in the end produced at a constant working axial flow with simultaneous dilution of the rollers in the radial direction, while

Then deformed cylindrical section d length 160 mm with a constant thickness of 4.4 mm at constant polotence each roller amounted to td1= 0,52 mm; td2= 0.6 mm, td3= 0,78 mm

Similarly produced deformation of all the other sites details, changing the relative position of the rollers in the radial direction during processing to provide the specified wall thickness.

When the deformation of the last conical section h with variable wall thickness of 2.2 mm at the beginning of the plot to 6.3 mm at the end of the rollers when the working axial flow bred in the radial direction with a decrease in the magnitude of thinning on each roller to zero; the rollers were installed at the end of the handle at a distance from the mandrel equal to the wall thickness of the original piece of 6.3 mm

Then he implemented the accelerated removal of the roller to its original position, made the removal of items from the mandrel, after which he performed the installation of the next workpiece on the mandrel, and the cycle repeated.

Similarly spent processing the above details using the scheme shown in Fig. 3.

In this case, three-roller kit used one roller for forming zone I at an angle1= 15and two videos with the same geometrical parameters for the formation of zone II under the programming scheme of Fig. 1, and the two zones. The value of the thinning was:

- conical transition section a;

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- on a cylindrical b:

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- in a transitional conical c:

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- on the cylindrical d:

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The loop body parts with variable wall thickness by this method decreased in 2-3 times in comparison with the processing on previously existing technology.

1. The rotational hoods hollow axisymmetric parts, in which the source deform the workpiece on a rotating mandrel multiple tapered rollers in a continuous deformation zone is split up into several zones, sequentially along the axis of the mandrel and inclined to it at different angles with increasing angle from the beginning to the end of the deformation zone, characterized in that the deformation is carried out at equal radial loads on each roller by moving rollers that interact with each zone relative to the rollers interacting with other zones in the radial direction by an amount calculated values of total strain on the treated area and the geometric parameters of each clip, with the vertices of the cones of rollers rasam, that separate zones of deformation zone of the workpiece to form multiple clips with the same geometrical parameters.

 

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