Method of forming large parts drive type

 

(57) Abstract:

The inventive method of forming large parts drive type involves stamping on a hydraulic press, double action. The blank is initially formed at the same time the upper half of the stamp and pierced with a punch to the height of the regulated maximum force developed on the outer slide of the press. Then under constant exposure of the upper half of the stamp piercing punch periodically introduced into the workpiece and return to its original position, making the Central part of the billet diameter of a given size. 1 S. and 1 C.p. f-crystals, 6 ill.

The invention relates to the processing of metals by pressure and can be used to obtain large parts such as disks, rings, flanges, bandages, etc.

A known method of manufacturing products of the type end with a massive rim, placing in the Central part of the engraving of the stamp for massive forming a removable drift-pin strengthening, pre-strain on the drift-pin strengthening, remove drift-pin strengthening of the stamp and the deformation of the peripheral part of the blank by forging [1] the Method allows to obtain forgings of large diameter with a thin jumper when otnet perform additional operations, associated with the manipulation of the removable drift-pin strengthening and application of means of mechanization.

The closest in technical essence and the achieved result is a method of forming large parts of disks, providing a consistent stamping first Central part, and then concentric circular plots [2] the Method provides a reduction in the necessary efforts of the press.

The disadvantage of this method is the reduced performance associated with the interruption of the deformation process, the necessity of lifting the upper half of the stamp after deformation the next section and perform the readjustment of the instrument. Furthermore, the method allows for uneven tall size and shape deformation of surfaces, not obitaemyh at the subsequent stages of forming.

The invention aims to remedy these disadvantages, namely to increase the productivity of the stamping process through continuous deformation of the workpiece and improving the quality of forgings by ensuring equal thickness of the Central part.

This task is solved in that in the method of forming large parts of the drive type, vklyuchayushchie simultaneously deform the upper half of the stamp and pierced with a punch to the height, regulated by the force applied to the upper half of the stamp, then the deformation is carried out at a constant influence of the upper half of the stamp on the peripheral portion of the workpiece and the periodic implementation of the piercing punch in the Central part of the billet diameter DB(0,22 K 0,35)D, where D is the diameter forgings, K factor taking into account the ratio of nominal effort in the upper half of the stamp Pnnωand sewed the punch Pyinjv,, . The best effect is achieved with the implementation of the strain on the hydraulic press, double action. Fig. 1 depicts the die and the workpiece in the initial (left side) and end (right side) moments simultaneous deformation of the workpiece upper half of the stamp and pierced by the punch; Fig. 2 the die and the workpiece in the initial and final moments of strain piercing punch; Fig. 3 the die and the workpiece in the initial and intermediate points of the compression upper half of the stamp; Fig. 4 - stamp and the workpiece in the final compression of the upper half of the stamp; Fig. 5 - the results of the calculation of the stress-strain state; Fig. 6 - punch burrs details "crown diesel gear".

The method is performed as the us stamp 3 is the compression of the workpiece end surface of the upper half of the die and piercing punch 4 until the maximum effort, developed by the cylinders, causing the top half of the stamp, then in the harvesting implement a piercing punch, putting the force of the cylinder inner slider (Fig.2). When this occurs, the movement of the metal at the periphery. The force applied to the upper half of the stamp and prevent uplift (disclosure stamp) in the process of implementing a piercing punch. After returning the attached punch to its original position is effective compression billet upper half of the stamp due to bilateral metal flow to the periphery and formed under the piercing end of the punch cavity. The deformation of the workpiece continues until it reaches the specified size by several implementations piercing punch under constant exposure of the stamp.

In the process of implementing a piercing punch is unacceptable disclosure stamp (lifting the upper half of the stamp). The condition of the disclosure can be formulated inequality

PnPynjv,

where Pnthe load acting on the upper half of the stamp-side of the workpiece.

Method of numerical solution of differential equations of plastic flow is calculated stress-deformable who ovci with the Central cavity. According to calculations of the stress-strain state (Fig.5) condition of non-disclosure stamp is performed with respect to

< / BR>
Settlement pattern forming metal in the process of deformation of the upper half of the stamp piece formed in the previous phase of the Central cavity (Fig.5) shows unwanted decrease of intensity of the metal flow in the radial direction to the periphery when the values of the ratio Din/D > 0,35 (2), as judged by the position of the boundary between the metal and the speed of movement of the metal Vrand Vz(for example, in Fig.5). Thus, when the value of Din/D 0,37 intensity of the flow of metal to the periphery of the reduced according to estimates by 4% compared to the intensity when the value of Din/D of 0.35, which leads to lower efficiency of the process.

Expressions determine the feasibility constraint relationship Din/D range 0,22 K 0,35 where .

This method is intended for the production of large forgings types of disks with a diameter more than 600 mm of steel and non-ferrous alloys, requiring substantial effort deformation.

The method was tested on Nizhnedneprovsky tube rolling plant named after K. Liebknecht for manufacturing the s press double action design USTM, characterized by the efforts of the cylinder outer and inner sliders respectively 40 and 20 mn. The diameter of the piercing punch was 250 mm

Pre-set to the size of 620+5-5145 the workpiece is heated to a temperature of 1200oC, were placed on the lower half of the stamp and is centered by means of special devices. The workpiece is deformed by means of the cylinders, causing the top half of the stamp before they reach the utmost effort. The thickness of the lintel was 91.93 mm. Then, including the Central slave cylinder, billet introduced piercing punch to the depth 18.20 mm After returning piercing punch to its original position the upper half of the stamp produced further strain on the height 14.16 mm Re-introduced the punch on the above depth. After returning the plunger to its original position the upper half of the stamp was made final deformation of the workpiece. The forging was removed from the stamp using the lower ejector. Dimensions stamped blanks corresponded shown in the drawing. Compared with the current process was reduced thickness jumper from 80 to 60 mm, which determined the reduction, over the use of the proposed method of stamping for the production of large forgings drive type in comparison with the prototype improves performance on 30.60%

The proposed method can be used in forging industries of metallurgy and engineering to produce blanks large in terms of details, the production of which by known methods is ineffective or impossible. Furthermore, the method allows to obtain nonaxisymmetric parts with thin Central part, stamping which requires much effort.

1. Method of forming large parts of the type of disc, including sequential deformation of the Central and peripheral parts of the workpiece, wherein the workpiece is initially deform at the same time the upper half of the stamp and pierced with a punch to the height of the regulated force applied to the upper half of the stamp, then the deformation is carried out at a constant influence of the upper half of the stamp on the peripheral portion of the workpiece and the periodic implementation of the piercing punch in the Central part of the billet diameter Din(0,22 To 0,35) D, where D is the diameter forgings, K - coefficient taking into account the ratio of nominal effort in the upper half of the stamp PnMr.and sewed the punch PinMr.< / BR>
< / BR>
2. The method according to p. 1, characterized in that deformat

 

Same patents:

The invention relates to the processing of metals by pressure, namely, devices for cutting scrap

The invention relates to the processing of metals by pressure, in particular to the construction of dies for die forging and trimming details

The invention relates to the processing of metals by pressure and can be used in the production of large-sized products, for example, of aluminium alloys in stamps, the capacity of which does not allow to produce large-size products

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.

6 dwg

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.

5 dwg

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

FIELD: technological processes.

SUBSTANCE: initial bar with thickness of at least around 20 inches from alloy on the basis of titanium is subsequently subjected to the first forging in the field of beta-phase and the second forging in the field of alpha-beta-phases. After subsequent heating of prepared billet to the temperature in the field of beta-phase the third forging is carried out with temperature from around 1550°F to around 1725°F. At that forging is performed from the first forging thickness of at least 15 inches to the second forging value of not more than 13 inches. For formation of semi-finished item the fourth forging is carried out in closed stamp with temperature from around 1550°F to around 1725°F. Then thermal treatment of semi-finished item is carried out. When manufacturing gas turbine disc after third forging billet is divided into sections with preparation of sectioned billet, which is further laminated.

EFFECT: preparation of large items with uniform fine-grained structure.

17 cl, 3 dwg

FIELD: metallurgy.

SUBSTANCE: invention relates to the metal deformation process and can be used in aircraft and power industry at manufacturing of disks of rotors of gas turbine engines and rotors of turbines of heating and atomic power plants. It is implemented moulding of drafts of stand Then it is implemented forming of blank by means of its distribution and unfolding of wall into flat ring. Wall of sleeve is formed with increasing of thickness from bottom to edge of stand. For disk with rim it is received with flange on wall of sleeve. After moulding it is implemented drawing out on mandrel of sleeve wall. After distribution and unfolding of blank it is implemented final calibration in punch.

EFFECT: ability of receiving of disks from different steels and alloys with specified physical-mechanical properties and structure.

10 cl, 2 dwg, 2 ex

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used in producing discs with ''blisk''-type vanes in isothermal and superplasticity conditions. In compliance with first version, heated billet is placed in isothermal mould comprising container and ceramic shaping elements. Billet is deformed by ball-tipped made die. Note here that vane is shaped by extruding billet material in cavity between shaping elements. Finished disc with vanes is withdrawn from mould by destructing ceramic elements. In compliance with second version, vane is first made and placed in isothermal mould. Note here that vanes are isolated by ceramic inserts while valve butts are arranged between two plates. Both plates and vane butts are deformed together in ball-tipped made die in isothermal and superplasticity conditions. Note here that deformation degree exceeds 20%. Note also that deformation rate makes (10-2 -10-3) s-1.

EFFECT: expanded process performances, higher quality.

14 cl, 2 dwg, 2 ex

FIELD: metallurgy.

SUBSTANCE: ingot is subjected to swaging-drawing to octahedron with total reduction of 1.6-1.7. Final forming is performed at shaped hammers at 4-5 displacements over hammer surface and, then, in closed sizing die. Total reduction ay final forming makes 3-5.

EFFECT: precise forged pieces with homogeneous fine-gram structure, high specific strength and ductility.

2 cl, 2 tbl, 1 ex

FIELD: metallurgy.

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

Up!