Method for production of rolled ring blanks from high-alloy nickel alloys
FIELD: technological processes.
SUBSTANCE: initial ring blank is produced with rectangular section. Specified cut length bar is thermally insulated by means of adhesion of two or three layers of asbestos cloth on its end and side surfaces and drying. Then heat-insulated bar is placed in furnace and is heated for upset. Upset is carried out in press with application of thermostat rings. Upset bar is pierced, after that it is paned or turned. Prepared initial ring blank is exposed to hot rolling. Then rolled blank is calibrated and thermally processed.
EFFECT: higher quality of prepared blanks due to elimination of crack formation during upset.
2 cl, 5 dwg
The invention relates to a pressure treatment of metals, in particular, to methods for producing a ring blanks for parts of gas turbine engines (GTE), and may find application in industries, which manufactured various annular (or circular, for example, disks) articles of aging Nickel alloys, especially high-alloy, characterized by limited ductility at stamping operations (in particular at upsetting press).
The known method deformation by forging (upsetting, punching) billets of high-alloy aging of Nickel alloys using the insulating them from deforming tooling (tool) by a random coatings [1, s, 300]. However, despite the positive effect of such insulation in welding workpieces of these materials formed the cracks, including rough, great length, both end surfaces and on the side (barrel) [1, ri]. This is due primarily to the fact that regardless of even the insulation of end surfaces of the intense heat from the side (at first cylindrical, then barrel-shaped) surface. At the same time, due to the redistribution of heat in the workpiece is podstugivaniya and insulated from the tooling surfaces. Therefore, in tomslake, when the deformable alloy has a narrow interval homogeneous state (the heating temperature under draught to the temperature of the beginning of the collapse), there is a sharp decrease in ductility (embrittlement) of the metal due to local collapse of the aging of the alloy mainly at the grain boundaries in the deformation process and, as a consequence, cracks [2, 3].
The known method precipitation blanks of high Nickel alloys in presses in which to reduce heat loss between the plates and the workpiece using pads (pads) of the cheap material heated in the furnace together with the workpiece or strip of heat-resistant alloys (as deforming tool), heated to 800...900° [1, s].
The disadvantage of this method is a significant complication of the precipitation process, the difficulty of obtaining the specified dimensions for each transition precipitation, increased consumption of auxiliary materials (gaskets) for each workpiece, the impossibility of providing a full guarantee to prevent cracking.
A known method of manufacture of annular workpieces made of heat-resistant Nickel alloys, including the original manufacturer of the rings-billet of rectangular cross-section through precipitation rod length with subsequent firmware and justify (or groove), as well as warm and hot rollers with p the following heat treatment .
The disadvantage of this method is that in case of using such high alloy steels, such as HEY 698 VD (≈25% γ'-phase), at upsetting rod length cracks of the type described in [1, ri], and alloys of type EP 742 VD (≈35% γ'-phase) or EC 79 VD (≈45% γ'-phase) this technology is generally unacceptable. The use of insulation type of asbestos cloth or mullite-siliceous mineral wool (as in method ) improves the situation but does not fully prevent cracking even in alloys with a number of γ'-phase up to 25% (HEY 698 VD). Therefore, operation rainfall has performed in several transitions with the deformation in each transition of the order of 20...30% or less. But in most cases this does not guarantee prevention of cracking.
In particular, upsetting the workpieces of alloy HEY 698 VD is produced after heating at 1160 1180...°with the end of the deformation at temperatures below 1000° . The temperature of complete dissolution γ'-phase during heating and the beginning of its separation when cooled in this alloy ≈1030°C. Podstugivaniya the surface of the workpieces to ˜1000°and below in the process of transporting them from the furnace to the press, installed on the bottom plate, the supply of the upper plate and especially in the deformation process leads to the beginning of an intensive decay with a sharp decrease in ductility is, as a result, cracking type [1, ri]. Depending on the massiveness (more massive billet slower podstegivayut) from values of the aspect ratio (section height and diameter of the workpiece), on the accuracy of wrapping a heat insulator (from seal it to the workpiece), and from the tendency of aging of the alloy to intense disruption (which in the first approximation increases with the increase of the possible total number of γ'-phase in this alloy, quantity, size and area localization of cracks (or on the end surfaces or barrel-shaped surface, or in both places at the same time) can vary within a wide range (figure 1).
A known method of manufacturing a rolled ring preparations of high Nickel alloys , including the original manufacturer of the rings-billet of rectangular cross-section through precipitation rod length using thermal insulation of the end surfaces of the upper and lower press plates with subsequent firmware and justify, or groove, as well as warm or hot rolling followed by heat treatment, in which the source rod length, insulated on the ends of the top and bottom layers of the ceramic insulator (mullite-siliceous wool or asmodai), the plate press before the draft is placed inside the ring-thermos is ATA from any carbon steel, heated in the same cage with rod length and installed on insulated plate press immediately before the issuance of the rod length on draught, and a ring-thermostat has a height of 3...5 mm less than the height of the upset of the rod length, inner diameter, 50...100 mm greater than the outer diameter of the upset of the rod length, and wall thickness in the radial direction is not less than 100 mm (if necessary, sludge is produced in several passages; in this case, the cylindrical surface of the original piece at all transitions starting from the second, turns into a barrel) [prototype].
The disadvantage of this method, in particular with regard to procurement in gripping device boot manipulator adjacent to the furnace cover with two layers of mullite-siliceous wool) is accompanied by intensive decay and, as a consequence, the crack growth. This is aggravated by the fact that in the zones of contact with the metal jaws of a gripping device boot manipulator billet podstegivayut stronger and faster than all the rest of the surface, resulting in cracks in these zones are formed even before the start of precipitation, and the precipitation they are very open, forming deep "Zev" (internal surface cracks of a dark, oxidized, because it formed the ri high temperature) (figure 2).
The technical result of the invention is the provision of comprehensive (on all surfaces and in the right areas) reinforced insulation to minimise heat loss in welding rods of standard length and, consequently, prevent cracking, especially in the case of aging of Nickel alloys with a number of γ'-phase over 25%.
This technical result is achieved by the fact that the original rod length before planting in the oven to heat under draught glued the ends and on the side surface of two or three layers of asbestos cloth and dry with lateral layers with the ends joined by folding (not butt). In the subsequent drying layered asbestos shell hardens and becomes a kind of capsule. It is important to bear in mind that careless touch this shell in the contact zone may break (it's relatively loose), resulting sponge gripping device can enter into direct contact with the workpiece and, as a consequence, again, you receive the chance of cracking.
All other activities are conducted in accordance with the method of the prototype.
Comparative analysis of the claimed solution with the prototype shows that the new method differs from the known fact that the original procurement rebuff in conditions of maximum sun the third insulation (on both end surfaces, on the lateral surface and in the corner areas). For aged Nickel alloys in conditions of deformation (especially alloys, with the number γ'-phase over 25%) it is very important to minimize the degree of supercooling of deformable blanks: the subcooling less, the less the degree of decomposition of the supersaturated solid solution in the given conditions, and the less likelihood of cracking. Only careful reinforced insulation in multiple layers of asbestos cloth by gluing in combination with rings-thermostats allows to approximate the conditions of deformation of the intermediate isothermal. From this it follows that the proposed method compared to the method prototype has distinctive features.
Known technical solution  (prototype), in which the draught bar length produced in the ring-thermostats with the use of insulation, and the heat insulator in the form of two layers of mullite-siliceous wool or asbestos fabric being coated with a on the bottom plate before issuing it from the oven these rods and rings thermostats and being coated with a top to them in the form of two layers of mullite-siliceous wool (here asbestos cloth unacceptable due to the fact that it is due to their relative stiffness does not provide the necessary seal and wrapping) and partly from the sides completely side surface cannot wrap because that hinder adjacent to the harvesting of sponges grasp the boot of the manipulator; the bottom end of the workpiece in the process of being moved from the furnace to the press, too, is without insulation). Thus, the prototype rod length (procurement) during shipment from the furnace to the press (mainly in the time interval of from several tens of seconds to minutes) from the lower end and on 30...40% side surface has no insulating coating. Moreover, the side surface of her at this time is in contact with the metal jaws of a gripping device boot manipulator that causes podstugivaniya contact zones and local collapse intensivecare alloys and as a result, cracking in these areas. It is important to bear in mind that these nuances insulation is crucial only for intensivstation Nickel alloys with a large number of γ'-phase (over 25%) are alloys of type EP ID (35% γ'-phase), EK ID (45% γ'-phase) and other alloys with a number of γ'-phase is not more than 25% (e.g., HEY 698 VD) prototype method quite effectively ensures the prevention of crack formation in welding. For workpieces of alloy type EP ID and EK IN sludge without taking into account the above nuances of insulation (i.e. the prototype method is virtually Tvrtko leads to crack formation. These differences indicate the novelty of the proposed solution.
The proposed method was tested on alloys with different amounts γ'-phase: HEY 698 VD (≈25% γ'-phase); EP ID (≈35% γ'-phase) and EK IN (≈45% γ'-phase). With respect to alloy HEY 698 VD method gives almost 100% positive result. In the case of alloys EP ID (ε≈ up to 50%) and EC ID (ε≈20...30%) is of great importance to the accuracy and thoroughness of insulation in the form of "asbestos capsules", transporting workpieces from the furnace to become and execution of the operation rainfall.
The invention is illustrated in the photos. Figure 1 shows the upset billet alloy EI 698 VD with a large number of cracks on the barrel side surface and at the ends (their pictures are not visible). Sludge produced without rings thermostats and without insulation.
Figure 2 shows the upset billet alloy EK ID: a - side view (with crack); b - end view. Sludge was carried out in accordance with the invention. However, when withdrawing the workpiece from the furnace because of careless movement of the arm on the side was torn out part of the "asbestos capsules". One of the jaws grasp the boot of the manipulator during transportation from the furnace to the press in contact directly with the workpiece. Crack is formed to precipitation. In the precipitation process in the tensile stresses on the barrel surface, the crack widened and deepened. On figa shows one of the biggest cracks formed under these conditions. Usually they are significantly smaller (figure 3: a - General view; b - enlarged x4).
Figure 4 shows a successfully transplanted in accordance with the invention, the billet of the alloy EK ID: - deformation ε=24...27%; b - deformation ε=23...24% (source height, figa and figb was different for different ciphers rings).
Figure 5 shows the successfully transplanted in accordance with the invention, the billet of alloy EP ID (ε=25%): a - lateral view; b - end view.
Thus, the new method allows defect-free draught pieces of alloys of the type EP ED to ε≈50% and type EK ED to ε≈20...30% for one transition. Macro - and microstructure, and mechanical properties of ring blanks, made in a new way, meet the requirements of the SPECIFICATIONS.
Sources of information
1. Dzugutov MY Plastic deformation of high-alloyed steels and alloys. - M.: metallurgy, 1971, 424 S.
2. Vaulin SHOSTAKOVICH, Eremenko V., Vlasova OLGA. and other Technological features of manufacturing of forged semi-finished products made of heat-resistant Nickel alloys. - In the book: "Advanced technologies of light and special alloys" / 100-l is party birthday of academician Afellow - M.: PHYS-LIT, 2006-432 S., s-301.
3. Ryabikin NM, Protsiv J.V. Preventing crack formation in the manufacture of allocating ring preparations of high Nickel alloys - ibid, s.285-293.
4. Production of ring blanks. Zubkov A. I., Lebedev V.N., Aref, VA and others - M.: Central research Institute of information, 1980, 284 S.
5. Malenkov D.B Heat-resistant steels and alloys. The Handbook. - M.: metallurgy, 1983, 192 S.
6. RF patent №2198760. A method of manufacturing a rolled ring preparations of high Nickel alloys (Ryabikin NM, Protsiv J.V.).
1. A method of manufacturing a rolled ring preparations of high Nickel alloys, including obtaining initial ring blanks with a rectangular cross-section by heating under draft rod length in the furnace, insulation, precipitation in the press using rings thermostats, future firmware and acceleration or turning, as well as warm or hot rollers received the original ring blanks and subsequent calibration and heat treatment, characterized in that the insulation rod length is carried out before landing in the oven to heat under draft by obkleivanie its end and side surfaces of two or three layers of asbestos cloth and drying.
2. The method according to claim 1, characterized in that use the measuring rod length is s of the most rapidly aging alloyed Nickel alloys with a number of γ '-phase, exceeding 25%.
FIELD: technological processes.
SUBSTANCE: from initial cylindrical stock semi-finished product is formed by means of hot die forging in two stages. In preliminary stage by means of settling in transitions stock dimensions are changed with reduction of height and increase of diametrical dimensions. In final stage cup walls are formed as well as bottom part. Settling is performed in convex and concave strikers with formation of concave and convex conical surfaces on the opposite side of settled stock. Stock is shifted prior to every subsequent transition of settling with concave side onto surface of concave striker. Dimensions of initial cylindrical stock, settled stock prior to corresponding transition of settling and after are selected with account of semi-finished product dimensions based on available ratios. Produced semi-finished product is exposed to thermal and mechanical treatment.
EFFECT: satisfactory working of the whole volume of stock and optimal properties of finished products.
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: technological processes.
SUBSTANCE: creation of ultrafine-grained structure in metal stock by means of its strain treatment with upthrust includes staged compression of stock with vertically compressing puncheon in die mold that contains matrix limited down with flat bottom, with cavity for stock installation in it and intended for treatment of stock in three orthogonal directions with provision of plastic flow of stock material along directions that do not coincide with direction of compression force. At every stage of strain treatment the stock is placed in matrix cavity, compressed, and deformed stock is taken out from matrix cavity. Prior to installation of stock in matrix cavity the bottom part of matrix cavity is filled with charge of refractory powder for 0.1-0.5 of compressed height of stock, then stock is placed for filling, charge is filled into free space created between two pairs of sliders and stock to the level that exceeds top point of stock by 0.1-0.5 of its compressed height, matrix is inserted into puncheon, displaced to provide stock compression of 10-60% from its height. Stages of deformation treatment of stock are repeated, changing directions of its strain, until ultrafine-grained structure is formed in the whole volume of stock. Device for formation of ultrafine-grained structure in metal stock during its strain treatment with upthrust arranged in the form of die mold that contains matrix with rectangular base plate, puncheon and two pairs of sliders installed in two mutually orthogonal directions. Upthrust is arranged in the form of charge from refractory material that fills the free space between sliders, matrix bottom, puncheon and stock.
EFFECT: production of bulky metal stocks with different ratios of size and increase of finished product output.
5 cl, 4 ex, 3 dwg
FIELD: technological processes; metallurgy.
SUBSTANCE: stock is assembled by means of laying of bars from metals and alloys in the form of packet. Assembled stock is deformed by means of equally-channeled angular pressing by punching of mentioned stock in the form of packet of bars through crossing vertical and horizontal channels of matrix. After that the mentioned stock is separated into bars that are calibrated to prepare finished bar.
EFFECT: reinforced bars from metals and alloys.
SUBSTANCE: hollow cylinder stock is brought with its not subject to treatment end to clamping device and fixed in it. After that a mandrel with a coaxially inserted and lengthwise set off spike is introduced into the end of the zone of the stock, subject to treatment. Its free end passes up to the clamping device. The end of the spike is brought after that in an axial direction of the stock into contact with geometric locking with the clamping device. The mandrel together with the clamping device and stock are axially passed through a stationary technological position. To facilitate inside and, if necessary, outside profiling, the surface of the stock along the section subject to treatment is radially effected in this position. The device contains the first and axially installed to it the secondary spindle straddles, axially set off to the first spindle straddle mandrel and the stationary technological position with cold fabrication tools for operating radially to the axis of the straddle. The clamping device is located coaxially against the axis of the first straddle and it is designed to be set off against the technological position. At that the technological position is situated stationary between the spindle straddles. There is also the movable spike axial-symmetrically situated inside the mandrel.
EFFECT: extended technological capabilities.
24 cl, 7 dwg
SUBSTANCE: device contains forging machine, mechanism for conveying tube stock into deformation site and mandrel. The mandrel is installed at the front end of a mandrel holder in kind of a rod. The rod is secured in the stationary bracket and is designed to axially travel. The end of the rod, backward of the mandrel travel, is located behind the bracket and has threaded and flat parts. Adjusting components are arranged on the threaded part. A cylinder spring and a block of disk springs are successively arranged on the flat part; at that the block of the disk springs thrusts into the stationary bracket. Rigidity of the disk springs exceeds that of the cylinder spring. Besides, a cylinder cartridge, enveloping the cylinder spring, is placed on the flat part; the said cartridge is situated between the adjusting components and the block of the disk springs. The thrust, adjusted along the axis of the rod, is installed on the part of the rod before the stationary bracket. A cylinder compression spring is installed between the thrust and the stationary bracket.
EFFECT: upgraded efficiency of forging process and quality of fabricated items.
SUBSTANCE: invention concerns area of constant magnets receiving with fine-grain structure from alloys on the basis of system neodymium -iron-boron or praseodymium - iron-boron, holding increased magnetic characteristic. Method includes blank casting and further its deformation by method of equal-channel angular pressing (ECAP) in intersected vertical and horizontal channels with intersection angle equal to 90-135° in range of temperatures 500-800°C with achieving accumulated logarithmic degree of deformation not less then 0.5. Method can include further processes of hot deformation by method of settling or rolling or extrusion of blank. Method can include also additional one-phase or multistep annealing 500-1000°C at different stages of treatment.
EFFECT: increasing of magnets magnetic properties, increase in productivity of process magnets receiving.
4 cl, 4 ex, 1 tbl
FIELD: technological processes.
SUBSTANCE: sequential blank compression in through rectangular matrix channel is performed in stages. Difference between channel side sizes is 0.5-1%. After each stage the blank is remounted. According to first variant, compression is performed by repeating cycles, each cycle consisting of three stages. At the first stage compression is performed along Z axis with material flow along Y axis and deformation restriction along X axis. At the second stage compression is performed along X axis with material flow along Z axis and deformation restriction along Y axis. At the thrid stage compression is performed along Y axis with material flow along X axis and deformation restriction along X axis. According to second variant, at the first two stages compression is performed in the same pattern. For the third an each next uneven stage blank is remounted along diagonal matrix channel. At the third stage compression is performed with X and Z axes rotation at an angle close to 45°.
EFFECT: intense plastic deformation of blank material maintained.
22 cl, 6 dwg, 4 ex, 1 tbl
SUBSTANCE: method of temperature control optimisation in processes, including following stages: temperature definition on dies, data communication to computer platform (9), implementing comparison of received data with target value. Accidental feedback to the running of technological process with usage of fluent heat carrier (12), implementing selection of element quantity of heat from die (8) for the purpose of reducing stage WARM-UP (8).
EFFECT: improvement of method of temperature control optimisation.
FIELD: technological processes.
SUBSTANCE: for parts production cold-upsetting tool is used in the form of multi-position unit. Unit includes five positions and contains puncheons, thrusters, assembled matrixes and strippers. Assembled matrix in the fourth position is installed motionlessly and is equipped with reduction step at the insert. Stripper of the fourth position is arranged with the opening, in which spring-loaded puncheon is installed. Cut billet is subjected to setting and calibration with leveling of butt ends and formation of conical marks. By means of further billet setting head is created. Then opening is pressed out in the billet and its external diameter is reduced with formation of step. Reduction of diameter is carried out in motionless matrix with insert, which has reduction step. For that purpose billet is displaced until it thrusts stripper with spring-loaded puncheon with its butt-end. Puncheon is installed in billet pressed out opening. Later billet is displaced together with puncheon and stripper via reduction step of matrix. After that billet opening is interweaved.
EFFECT: expansion of technological resources.
2 cl, 4 dwg
FIELD: technological processes.
SUBSTANCE: for one technological operation two types of pressing are carried out. As one type direct pressing of metal is used from container to its exit via calibrating zone. The second type is equal-channel angular pressing with provision of shift deformations in metal. Direct pressing is carried out prior to angular pressing. Shift deformations at angular pressing are provided immediately after metal exit from calibrating zone of direct pressing. Pressing is performed in the device that contains puncheon, matrix with two crossing channels and container. Container is installed above the matrix. Container cavity forms inlet part of vertically installed matrix channel. Area of inlet part cross section exceeds cross section area of vertically installed channel. The latter is arranged in the form of calibrating belt for direct pressing of metal from container. Height of belt makes 4-10 mm, and its diameter is equal to diameter of matrix second channel.
EFFECT: production of long-length items with high mechanical properties from different structural materials with simultaneous reduction of power intensity.
6 cl, 4 dwg, 3 ex
FIELD: construction equipment.
SUBSTANCE: rod ends are made with thickenings which have screw. For rods joining joiner is used with inner screw. Thickenings on rod ends are received on forging press fitted with equipment for cold heading of reinforcing rod ends. As stated device for disembarkation forging die is used, having longitudinal channel along the length for operation security with long reinforced rods.
EFFECT: provision of process capability widening of used equipment with serviceability and economic feasibility preservation.
20 cl, 12 dwg
FIELD: technological process.
SUBSTANCE: forging is obtained by forging an ingot by hydraulic forge press in four-die forging device. The forging undergoes thermal processing and shot-blasting in shot-blast cleaning chamber. Further ultrasound control of forging is performed along the whole forging length, determining actual borders between flaw-free part and sinkhead and bottom. Then sinkhead and bottom of the forging are removed at the determined borders.
EFFECT: enhanced metal yield.
3 cl, 1 ex
FIELD: manufacture of intermediate blanks from α- and α+β-titanium alloys by hot deformation method.
SUBSTANCE: proposed method includes forging an ingot into bar during several passes at temperature of β- and (α+β) field. Then, blank is subjected to machining and two-stage heating. At the first stage, blank is heated to temperature of its surface which is below polymorphous transformation temperature by 250 C and is above polymorphous transformation temperature by 100 C; heating is performed at rate of 0.3-2.5°C/s. At the second stage, blank is cooled down or heated to temperature which is below polymorphous transformation temperature by 40-250 C. Final molding is performed in (α+β) field at forging reduction ratio at last passes of 1.36-2.5.
EFFECT: reduction of blank heating time to molding temperature; increased productivity; possibility of obtaining fine-grain structure of blank metal.
2 cl, 3 ex
FIELD: metallurgy industry; methods of manufacture of the flat shape made out of the binary zirconium-niobium alloys.
SUBSTANCE: the invention is pertaining to the field of metallurgy, in particular, to the metal forming and may be used at manufacture of the flat shape applied in the capacity of the structural material for the active zones of the atomic reactors. The ingot made out of the binary zirconium-niobium alloy is expose to forging for production of the blank. The forging is exercised in two stages. At the first stage the forging is conducted with heating in the temperature range of existence of β-zirconium. At the second stage the forging is conducted in the upper part of the temperature range of existence of(α+ β)-zirconium at the temperature of not less than 800°С with the reduction rate of the cross-sectional area of no less than 1.3. Then exercise the hot rolling of the workpiece blank ands its cold rolling with the thermal treatments. As a result the invention ensures production of the flat shape with the improved operational properties and the smaller amount of the spoilage under the regulated characteristics.
EFFECT: the invention ensures production of the flat shape with the improved operational properties and the smaller amount of the spoilage under the regulated characteristics.
1 dwg, 1 tbl
FIELD: plastic working of metals, possibly manufacture of forged pieces of elongated articles such as rotors or shafts.
SUBSTANCE: method comprises steps of upsetting block prepared from cast forging ingot; removing out of upset block its central flaw zone by piercing it with use of hollow broach whose diameter is equal at least to 200 mm; subjecting pierced block to intermediate heat treatment; then mechanically working its inner and end surfaces and sealing its central cavity by electroslag refining of electrode; selecting material of electrode according to predetermined level of properties of central zone of article; then forging block to desired size and performing preliminary and final heat treatment of it.
EFFECT: improved metallurgical quality, lowered cost price of forged pieces.
2 cl, 6 dwg, 2 tbl
FIELD: plastic working of metals, possibly forging ingots and billets in hydraulic forging presses and radial-squeezing machines.
SUBSTANCE: press includes two holders of upper and lower strikers with inclined faces; two holders of lateral strikers having kinematics coupling with above mentioned two holders and also having inclined face; mounted on inclined faces anti-friction plates and four strikers. Press is provided with system for cooling strikers and their holders. Cooling system includes valve for supplying water, manifolds for feeding and draining water, pipelines and flexible hoses. In striker holders and strikers ducts are formed. Pipelines going out from water supply manifold are communicated with ducts of striker holders and of strikers. Said ducts at other side are communicated through pipelines with water draining manifold. Ducts of striker holders are arranged under zones of mounting anti-friction plates; ducts of strikers are arranged under their working surfaces.
EFFECT: increased operational time period of anti-friction plates and strikers due to removing excess heat from them.
2 cl, 3 dwg
FIELD: plastic working of metals, namely manufacture of round cross section forged pieces from ingots and preliminarily deformed blanks in forging presses with four-striker forging devices.
SUBSTANCE: method comprises steps of hating ingot or blank and subjecting it to rough or sizing forging in four-striker forging device by the same strikers with concave curvilinear surfaces. When strikers are closed their concave surfaces form cylindrical cavity with relation of radius of concave curvilinear surface to circle radius inscribed into cavity formed by closed strikers in range 1.15 - 2.10. At rough forging process blank is subjected to single squeezing stages at deformation degree 18 - 70% while sustaining relation d1/d2 = 1.4 - 2.7 where d1 - mean diameter of ingot or blank; d2 - diameter of circle inscribed to cavity formed by closed strikers. At sizing forging process relation d3/d4 = 1.02 - 1.15 is sustained where d3 - diameter of blank after rough forging of it; d4 - diameter of sized forged piece.
EFFECT: reduced labor consumption of forging process, enhanced efficiency, less expenses for making tool.
3 cl, 4 dwg, 2 tbl
FIELD: plastic working of metals, namely ingot forging in presses of four-striker forging systems.
SUBSTANCE: method comprises steps of squeezing ingot by means of four strikers for forming four dents on lateral surface of ingot; squeezing said dents, feeding and tilting blank, sizing forged piece. Said dents are squeezed for forming octahedral cross section blank having width values of faces formed at squeezing process no less than width values of non-squeezed faces. Blank is subjected to tilting after each pass alternatively by angle 45° and 135° in the same circumference direction. Before sizing, blank is tilted by angle multiple to angle 22.5°.
EFFECT: less loss of yield for forged pieces after their mechanical working.
4 dwg, 1 ex