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 , 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 , 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  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, 19802. USSR author's certificate N 1139553, class B 21 J 5/00, 19833. 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.
FIELD: plastic working of metals, possibly operations for finish working of forgings of double-end box nut wrenches.
SUBSTANCE: die set includes upper and lower plates with guiding columns, punch for punching operation mounted on upper plate, stripper, lower die for punching, half-open trimming lower die and trimming punch. Trimming lower die is mounted on upper plate; it has cutting edge and cavity arranged behind collar of cutting edge and designed for freely placing forging of nut wrench. Trimming punch is mounted on lower plate and it has embracing supporting surface for fixing forging at trimming and straightening operations.
EFFECT: enhanced quality of forging.
9 dwg, 1 ex
FIELD: metal working, possibly manufacture of flanged articles and articles without flanges of different alloys.
SUBSTANCE: method comprises steps of heating blank and deforming it in die set; sustaining relation of blank temperature to that of die set in range 0.7 - 7.4. Blank is heated in predetermined temperature range depending upon blank material. Said temperature range may be found from ductility diagram and(or) yield curves and(or) from blank material recrystallization diagrams.
EFFECT: enhanced factor of using metal, improved quality of articles, lowered labor consumption of forging and subsequent working of blank.
6 cl, 2 dwg, 2 ex
FIELD: plastic working of metals, possibly forming forged pieces, for example rings, gear wheels, flanges.
SUBSTANCE: initial blank is heated, preliminarily shaped, finally formed and trimmed. At final forming open die set is used; said die set has gap between its upper and lower halves. Said gap is arranged in zone of forging that is formed last. Dimensions of die set are no more than respective dimensions of forging in order to prevent deforming of displaced excess of metal.
EFFECT: lowered deforming efforts, decreased metal consumption.
11 cl, 2 dwg, 1 ex
FIELD: plastic working of metals, possibly manufacture of forged pieces with central opening.
SUBSTANCE: method comprises steps of upsetting heated initial blank; forming semi-finished product having bridge in zone of one end of its inner portion in die set without forming burr; remaining part of end surface having no contact with tool; then performing final forming, mainly in one half of open die set at displacing outer burr and with possibility of displacing inner burr; removing bridge and trimming burrs.
EFFECT: lowered metal and energy consumption at process.
20 cl, 6 dwg, 1 ex
FIELD: plastic metal working, namely processes of die forging, possibly for manufacturing stepped hollow shafts.
SUBSTANCE: method comprises steps of calibrating blank prepared by chopping; forming in blank upper and lower cavities, bottom portion with cylindrical near-bottom part and local outer bulged zone. Upper cavity is formed at first pressing out stage. At second stage of pressing out lower cavity, bottom portion and local outer bulged zone are formed simultaneously while blank is centered by punch along it upper cavity and in die along cylindrical near-bottom part.
EFFECT: enlarged manufacturing possibilities of method.
FIELD: plastic working of metals, possibly manufacture of hollow parts such as sleeve type parts with central protrusion on inner surface of bottom, namely artillery shell cases.
SUBSTANCE: method comprises steps of backward pressing out of initial blank and shaping bottom portion having protrusion on inner surface during several transitions. After backward pressing out transition, blank is drawn at several transitions. Bottom portion with central protrusion is formed during two transitions, namely: at transition for preliminarily shaping central protrusion and at transition for finally forming bottom portion. Preliminary forming is realized during transition of backward pressing out of initial blank by means of inner punch with recess. Final forming is realized by means of inner punch with recess and outer punch with protrusion.
EFFECT: improved quality of articles.
FIELD: plastic working of metals, namely forging production, manufacture of forged pieces of ring-like cone gear wheels with diameter 638 mm and with wide massive rim.
SUBSTANCE: method comprises steps of preliminarily upsetting initial blank with diameter 250 mm and length 335 mm; then subjecting upset blank to non-complete open broaching and its further die forging. All operations are realized in the same die set. Preliminary upsetting is performed on flat striker with diameter 350 mm till achieving diameter of upset blank equal to said value. Striker is arranged in central portion of die set impression before broaching and after broaching it is removed. Non-complete open broaching of upset blank is realized by means of detachable cone broach with mounting land having diameter 270 mm.
EFFECT: improved quality of produced forged pieces.
8 dwg, 1 ex
FIELD: plastic working of metals, possibly manufacture of axles of rolling stock by forming and forging.
SUBSTANCE: method comprises steps of deforming initial square cross section blank by forging till intermediate designed size by knocking off faces in order to form semi-finished cylindrical product of forged piece; then feeding semi-finished product of forged piece to hammer die set. Die set is detachable one, it includes two parts with cavities restricting open finish impression without flash grooves. Profile of finish impression of die set corresponds to final size of forged piece. Two compensation openings are arranged in ends of impression. In die set hot die forging of semi-finished product driven to rotation by means of manipulator is realized. Then excess metal on ends is trimmed, forged piece is straightened and cooled.
EFFECT: enhanced quality of forged piece due to providing optimal deforming schedule, lowered power and metal consumption.
4 cl, 5 dwg
FIELD: plastic working of metals, possibly manufacture of internal combustion connecting rod by closed forming.
SUBSTANCE: method comprises steps of preparing blank with two thickened end portions and one thickened portion in mean zone; deforming prepared blank in cavity of die set while making openings in thickened end portions at displacing blank metal; shaping mean portion of connecting rod and after-forming its heads. Volume of thickened portion in mean zone of blank exceeds volume of mean portion of article by value equal to half of total metal volume of blank displaced at making said openings. Gravity center of thickened portion of mean zone is spaced from axes of openings by distance inversely proportional to metal volumes displaced at forming respective openings.
EFFECT: improved quality of article.
2 dwg, 1 ex
FIELD: plastic working of metals, possibly forging blanks of nickel base super-alloy.
SUBSTANCE: method is realized with use of forging press with forging die sets of nickel base super-alloy having yield limit no less than stress of plastic yielding of super-alloy at forging for making forged pieces at temperature range approximately from 926.67°C till approximately 1010.00°C at nominal deformation rate. Blank for forging and die sets are heated till said forging temperature. Forging is realized at such temperature and at nominal deformation rate. Nickel base super-alloy selected from group of alloys may be used as material of forged blank. According to one variant of invention blank of compacted powder of nickel base super-alloy is used for forging. In such case die sets are made of nickel-base super-alloy containing, mass%: aluminum, approximately 5 - 7%; molybdenum, approximately 8 - 15%; tungsten, approximately 5 - 15%; magnesium, near 140 ppm; nickel and impurities, the balance.
EFFECT: lowered costs for producing forged pieces of super-alloy with desired properties.
15 cl, 3 dwg, 2 tbl