A method of manufacturing annular forgings without stamping gradients

 

(57) Abstract:

The invention relates to the processing of metals by pressure, and is intended for manufacture by forging on the universal stamping equipment ring forgings without stamping gradients. The technical result improved quality forgings and metal saving. How is that in forging the stamp is stamped annular workpiece with sloping walls, with a jumper for firmware holes in the form of a truncated dome, located at the end of the smaller base of the forgings. Stamped workpiece is mounted on PocoLoco matrix jumper up. When exposed on the outer end of the dome-shaped jumper procolon punch is straightening jumpers. Radial movement of the metal jumper provides the distribution of the upper end of the annular workpiece. Upon further movement procollege punch is firmware holes. After flashing hole preparation is established by 180oin edged matrix. The trim punch is calibrating ledge. When lowering the trim punch is calibrated relative to the inner diameter, and then trim scrap. When reverse motion of the slide for a debate relates to the processing of metals by pressure, namely, to methods of manufacture by forging ring of forging without stamping gradients.

The invention can be used in the manufacture of ring forgings for versatile stamping equipment in forging and stamping shops of machine-building enterprises in the conditions of serial and mass production.

A known method of manufacturing a ring forgings [1], which is that when the stamping on the ring surface of the workpiece, in place of the connector stamps, receive technological overlap and force calibration is applied to this overlap. When crimping the lower part of the billet is deformed due to the impact of the matrix on the technological overlap. The portion of the workpiece located above technological overlap, deformed out of contact with the matrix. Burrs and risks of this part are missing.

The disadvantage of this method is that the forgings are made by known techniques, have unstable dimensions as height and diameter. Because it is impossible to perform technological overlap the same on all parts, stamped in one stamp, forgings after calibration will also differ among themselves. In addition to cognatus, located on the outer wall of the ring and overlap remaining from the awl holes.

There is also known a method of manufacturing annular forgings without stamping gradients [2], which is that after forming the hollow billet with sloping walls, trim scrap and firmware hole of the workpiece is subjected to calibration on the outer diameter and the wire at the inner diameter, the feed of the workpiece is carried out on site off-loaded when the crimping its end face at a distance of 0.05 to 0.3 of the height of the workpiece.

The disadvantage of this method is that its implementation requires significant effort both during calibration and during pullback and, as a consequence, the low resistance of the calibration matrix and the broaching of the mandrel, resulting in the forging burrs. Additionally, the known method can be carried out with application of additional heat, because the calibration procedure, and pulling by a known method is incompatible with the operations of the cutting Burr and firmware holes on the pressed blanks.

The closest technical solution of the present invention, taken as a prototype, is a method of manufacturing a ring forgings [3] that C calibration with the application of additional force to the deformable end face of the workpiece in the direction the opposite direction of the force calibration. At the same time produce the trimming of technological overlap, i.e. like metal workpiece between the cutting edge of the punch-matrix and the punch.

The disadvantage of this method is that in exercising its not provided with sufficient accuracy the internal size of the workpiece, since the receipt of the internal cavity of the workpiece is carried out through the distribution of technological overlap remaining from firmware holes, dimensional accuracy which is much lower than the size of the forgings.

The aim of the present invention is to improve the quality of the products, expanding their range and economy of metal.

This goal is ensured by the fact that the method of manufacture of annular forgings without stamping gradients, which are forging a hollow blank with sloping walls and subsequent serial pokolku holes, trimming Burr, editing and calibration, while the edit is made by application of force firmware holes to the curved crosspiece made higher end of the smaller base of the hollow billet, and then carry out a free calibration internal poverhnostyah the base of the workpiece, this is followed by trimming of the overflow.

In the sources of information about the level of science and technology similar technical solutions with the above distinctive features of the method of manufacturing annular forgings without stamping slope is not detected, which indicates the significance of the distinctive features of the present invention.

The invention is illustrated by drawings, showing:

in Fig. 1 - firmware holes with a preliminary edit of the ring;

in Fig. 2 - process final calibration ring and trimming Burr.

Proposed according to the invention a method of manufacturing annular forgings without stamping gradients as follows.

In forging strain stamped hollow annular workpiece 1 with inclined sides, with angle , with a jumper for firmware 2 in the form of a truncated dome, located at the end of the smaller base, with overflow 3 on the other end. Stamped workpiece 1 is placed in PocoLoco matrix 4 jumper 2 up. When exposed on the outer end of the dome-shaped jumper 2 procolon pawnshop 5 is straightening jumper 2. Radial movement of the metal AC is; . Upon further movement of the punch 5 is firmware hole, with the inner surface of the annular workpiece does not have the technological overlap, remaining from the awl holes in the known methods at the location of the jumpers below or flush with the face of the workpiece. After flashing the holes of the workpiece 1 is mounted to rotate 180oin edged matrix 6. As lowering the trim punch 7 having at the end of calibrating the projection 8, the latter entering the inner cavity of the ring 1, calibrates its internal hole by applying a tangential force to its outer side surface along the line of the cutting Burr directed in the direction opposite to the efforts of the calibration. Force calibration significantly less effort cutting Burr, so stocking fully covers calibrating ledge 8 of the trim punch 7 and then upon further downward movement, the end of the cut punch 7 acts on the end face calibrated on the inner diameter of the workpiece 1. The press force is applied to the end face of the workpiece 1, pushing it through edged matrix 6, producing cutting fin 3. When reverse motion of the press slide the workpiece held by the forces of friction on the calibrating ledge 8 Ecodit a slight increase in the outer diameter of the ring, and force calibration is negligible at small values of the deformation ring cannot pass through edged matrix 6 and can be easily removed from the trim punch 7 at reverse motion of the press slide.

An example implementation of the method. The method is implemented by forging billet bearing ring according to the drawing 2322/02 of steel SHS. Forged ring has dimensions: outside diameter of 162 mm, an internal diameter of 102 mm, height forgings - 56 mm For the manufacture of rings, on the hammer with MPH - 3 tons was stamped hollow annular workpiece with inclined sidewalls with an angle of inclination of 9 degrees, with a jumper thickness of 6 mm above the end face of the smaller base. The internal diameter of the smaller base (building) equal to 90 mm In the firmware of the holes are pre-distribution holes, the cross section of the forging has a twist angle of 5o. The internal diameter of the smaller base increased to 95 mm. Then the forgings produced trimming Burr and finally calibrated in the calibrating ledge trim punch, which has a size of hot-diameter forgings 102 mm. is Obtained forging of a cylindrical shape with predetermined dimensions.

The proposed method of manufacture of annular forgings POS is the dominant instrument. In the process reduces the complexity of manufacturing of forgings as trimming Burr, firmware holes and calibration is carried out in two streams of serial stamp. On the inner surface of the rings there is no residue from the awl holes, which greatly increases the accuracy of forgings in the reduction of metal consumption. The reduction of metal consumption is also due to the decrease of the magnitude of the overflow, because the ring forging is stamped with the size of the connector is equal to the outer diameter of the ring, in contrast to known methods, in which the calibration is carried out by compression on the outer diameter of the ring forgings.

Sources of information

1. USSR author's certificate N 893370, class B 21 J 5/02, 1980

2. USSR author's certificate N 1139553, class B 21 J 5/00, 1983

3. USSR author's certificate N 1274835, class B 21 J 5/02, 1985

A method of manufacturing annular forgings without stamping gradients, including stamping hollow billet with sloping walls and subsequent serial pokolku holes, trimming Burr, editing and calibration, characterized in that the correction is made by application of force firmware holes to the curved crosspiece, the implementation of the surface by application of opposing efforts to overflow, located in close proximity to the end face of the larger base piece, then trim Burr, deleting forgings with calibrating punch is when reverse motion of the slide with the back cut of the matrix.

 

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