2265 results about "Forge" patented technology

The invention belongs to a manufacturing technology of aluminum alloy and relates to a method for manufacturing a high-strength 7055 aluminum alloy forge piece formed by spraying. The method sequentially comprises the following steps: (a) melting components of 7055 alloy in an intermediate frequency furnace; (b) degassing, deslagging, refining and filtering an aluminum alloy fusant; (c) forming the filtered fusant by spraying to obtain a columnar aluminum alloy ingot blank; (e) carrying out hot extrusion on the aluminum alloy ingot blank formed by spraying; (f) constantly cutting the extrusion ingot as required and then carrying out free forging; (g) carrying out blocker-type forging and / or stamp forging on the blank after the free forging to obtain a stamp forging piece; and (h) carrying out T6 heat treatment on the stamp forging piece. A large-specification and high-property 7055 product can be obtained by using the method which is suitable for industrial production.

The invention relates to a double diffusion intussusception forge technique of a bearing ring of a tapered roller, belongs to the technical field of forging of the bearing ring of the tapered roller and mainly aims at solving the problems that the existing ring forging technique is not suitable for various bearing rings of the large and medium size tapered rollers. The technique is mainly characterized in that: (1) a GCr15 steel material section is heated to 1050 DEG C on a medium frequency induction furnace, then upset on a press, extruded backward and forward, formed, sheathed respectively and is separated into an outer sleeve and an inner sleeve or a small outer sleeve blank; (2) the outer sleeve blank is ring-rolled on a ring rolling machine, then reeled on the press and cooled into an outer sleeve forged parts of a bearing; and (3) the inner sleeve or the small outer sleeve blank is placed on the press, upset again, extruded and punched and then a ring part is obtained which is ring-rolled on the ring rolling machine, then an inner sleeve hot forged part after being ring-rolled is reeled on the press and then cooled to obtain the inner sleeve forged part of the bearing. The technique is mainly used for manufacturing the inner and outer ring forged parts of the bearing of the large and medium size tapered roller with various types, small batch or large batch.

The invention relates to a machining process of an impeller of a compressor, in particular to a machining method of a three-dimensional closed impeller, which is to clamp a semi-finish turned forge piece on a five-axis linked computer numerical control machining center to perform closed channel overall milling including drilling, coarse machining, semi-precision machining, back chipping and finish machining to mill the entire impeller and impeller channels. Compared with the conventional welding method, the machining method has the advantages that: the raw materials are saved and production cost is reduced as only one entire forge piece blank is used; the working efficiency is improved greatly because fewer machining process procedures are adopted and machining speed is high; the machining quality is high as quality defects caused by thermal deformation and welding are avoided; the machined impeller has high strength and high corrosion resistance; and the machining time of the impeller is reduced and the life index of a tool is improved because the flow the overall milling machining method is optimized according to the material, structure, specification and technical requirements of the workpiece and an applicable tool is configured according to different machining process procedures.

The invention discloses a single image super-resolution rebuilding method. Based on non-local similarity and a classification half-coupling dictionary learning algorithm, the method comprises a training stage and a rebuilding stage. According to the method, the half-coupling dictionary learning algorithm is used as a framework, training image block sparse domain classification based on mapping errors is introduced, and a heuristic method strategy conducted alternatively through the sparse domain classification and the half-coupling dictionary learning is adopted; sparse domain non-local similarity restriction items are introduced, structural information of training image block space is excavated in the sparse domain so as to rebuild more high-frequency details; the sparse representation algorithm based on non-local restriction is improved to meet the requirements of the half-coupling dictionary learning algorithm overall framework; further, an error compensation mechanism is introduced into the rebuilding stage to further improve the super-resolution rebuilding quality. Compared with the prior art, the method improves rebuilt texture details and forge edge and saw tooth removal, achieves good effects, and achieves best subjective visual effect in the prior art.

The invention relates to a manufacturing method of a rotationally-forged aluminum alloy hub and belongs to the technical field of manufacturing of automobile parts. Aiming to solve the problems of complicated process, low production efficiency and high energy consumption in the prior art, the manufacturing method of the rotationally-forged aluminum alloy hub is provided and includes blanking a thick aluminum alloy hot-rolling plate into a cake blank according to the size of the hub; heating and preheating at the temperature of 430 DEG C to 470 DEG C; placing the preheated blank into a die and forging in a forge press to obtain a forged aluminum alloy hub blank; finally placing the forged aluminum alloy hub blank into the forge press for rotary forging and forming, then performing heat treatment and machining to obtain the rotationally-forged aluminum alloy hub. By the method without need of upsetting and with low preheating temperature before forging and forming, process is greatly simplified, production efficiency is improved, and energy consumption is reduced. Besides, the obtained hub has good mechanical property.

The invention relates to a method and a clamp for moulding surface positioning clamping of a finish forge blade. According to the method, a vane is subjected to positioning clamping through a basin mounding surface of the blade, an inner side moulding surface of a blade root marginal plate, and a V point on the inner side mounting surface of the blade root marginal plate, by the positioning of an air inlet edge, and the clamping of a back mounding surface of the blade, as well as by using a high-accuracy positioning adhesive, and an adhesive coating method, and through a positioning block of the basin moulding surface of the blade and a clamping block of the back moulding surface of the blade. According to the method and the clamp, a satisfying contact area can be obtained by adoption of the high-accuracy adhesive, and the positioning rigidity of the blade is enhanced by adoption of the basin moulding surface of the blade, the inner side moulding surface of the blade root marginal plate and the V point on the inner side moulding surface of the blade root marginal plate for the positioning. According to the method and the device, the problems that the accurate positioning is difficult to realize and the moulding surface of the blade deforms or is damaged because the blade is thin, the blade body is small and the moulding surface is complex are solved. By the method and the device, the positioning accuracy of the mechanical processing of the blade is improved, and the technological process is optimized, so that the processing quality and the production efficiency of the blade are improved, the process is simple, the number of fixtures is reduced, the processing cycle is shortened, and the production cost is reduced.

A multi-direction forging technique and die for a 7A04 aluminum alloy cartridge receiver body part belongs to the technical field of metal material plastic forming and aims at effectively overcoming the problems of the existing opening-die forging technique and isothermal-die forging technique. The order of the multi-direction forging technique of the invention includes the steps of baiting, heating, rough making, reheating and multi-direction forging. The multi-direction forging relates to (1) using a multi-direction die forging die to pre-forge and form a heated 7A04 aluminum alloy roll forging rough;(2) then suing the multi-direction die forging die to realize finally forge to forge a die forging element. The invention multi-direction forging die includes symmetrical upper half and lower half concave model, a pre-forging convex model, a final-forging convex model, a fixing plate for the pre-forging convex model, a fixing plate for the final-forging convex model and a model frame consisting of an upper model seat and a lower model seat. The invention has the advantages of reasonable technique flow, stable technique parameter and performance, simple structure of the die, convenient manufacture, mounting and use, reliable work. And the invention can greatly reduce the friction resistance between a forging element and a die chamber, improve the surface quality of the forging element and remarkably improve the service life of the die.

The invention discloses a method for machining ultrathin wall sleeve parts. The method includes the first step of carrying out normalizing treatment on a forge piece, the second step of carrying out rough-turning, the third step of carrying out the first ageing and distressing treatment, the fourth step of carrying out semi-finish-turning, the fifth step of carrying out the second ageing and distressing treatment, the sixth step of carrying out finish-turning on an inner hole and semi-finish-turning outer circles, the seventh step of carrying out the third ageing and distressing treatment, the eighth step of carrying out finish-turning on the small end, the ninth step of carrying out finish-turning on the outer circles, and the tenth step of carrying out ultra-finish-turning on the outer circles. The cylindricity of the outer circles of a finished ultrathin wall sleeve through the method is smaller than or equal to 0.02, and the wall thickness difference of the finished ultrathin wall sleeve is smaller than or equal to 0.02. Size accuracy and accuracy of form and position can all be guaranteed.

The invention relates to a method for electrolytically machining a complex case type surface, comprising the following steps of: (1) installing a forge piece blank on a jig, setting a dividing disc on the jig, and dividing a ring-shaped forge piece blank machining area according to a minimum machining unit through the dividing disc; (2) determining the position of a block according to the dividing disc and determining an electrode adopted by the position; and (3) electrolytically machining the ring-shaped forge piece blank by an electrolytic machining machine tool, wherein the working parameters of the electrolytic machining is as follows: a machining gap is 0.1-0.8 mm, electrode feed speed is 0.25-1.5 mm / min, machining voltage is 15-20 V, electrolyte is a NaCl water solution with the mass concentration of 15-18 percent, the temperature of the electrolyte is 30-40 DEG C, and the hydraulic pressure of the electrolyte is 4.5-1.5 MPa. The method has high electrode utility ratio by machining areas with same geometries with a same electrode, can be used for the manufacture of cases of various large-sized motors and has wide application prospect.

The invention discloses a method for rolling and shaping titanium alloy tapered-ring forge pieces. In order to obtain the titanium alloy tapered-ring forge piece with good organization and performance, and realize precise rolling, the method comprises the following steps: an alloy bar is subjected to heating and continuous upsetting, deformed by 50%-55%, made into solid cake, and then subjected to punching to cause the hole diameter to be 30%-35% of the outer diameter thereof so as to obtain a hollow cake; the hollow cake is subjected to heating and rolling and deformed by 20%-25% to obtain a rectangular ring blank; the rectangular ring blank is subjected to heating and rolling and deformed by 30%-35% to obtain a rectangular pre-rolling blank; the pre-rolling blank is subjected to heating, loaded in the rolling mould of a ring rolling mill, rolled in the tapered hole of the rolling mould, and deformed by 25%-30% to obtain the tapered-ring forge piece. When being rolled, the widening speed of the pre-rolling blank along radial direction is 2mm / s-15mm / s, and the received radial roll force is 40000kg-220000kg. The method is mainly used for shaping the tapered-ring forge piece of an aeroengine. By the method, the tapered-ring forge piece, the ring surface of which is a complex curved surface and distributed in a streamline form along the shape of the piece, can be obtained.

The present invention provides new polymer induction bonding technology. Induction heating technologies are utilized to weld, forge, bond or set polymer materials. The invention provides controlled-temperature induction heating of polymeric materials by mixing ferromagnetic particles in the polymer to be heated. Temperature control is obtained by selecting ferromagnetic particles with a specific Curie temperature. The ferromagnetic particles will heat up in an induction field, through hysteresis losses, until they reach their Curie temperature. At that point, heat generation through hysteresis loss ceases. This invention is applicable to bonding thermoplastic materials, wherein only the area to be heated has ferromagnetic particles in it; bonding of thermoset composites, which have been processed with a layer of thermoplastic material on one side; curing of thermoset adhesives or composite resins; or consolidating thermoplastic composites.

Control systems, methods, and algorithms are provided for controlling the process parameters during FSW in order to repeatedly produce high quality welds for high temperature alloys such as titanium alloys and superalloys. In accordance with exemplary embodiments of the present invention, a desired range of forge load, pinch load, and / or travel load can be reliably maintained in a FSW system by adjusting the rotational speed thereof. In other embodiments, a desired temperature range of the tool or weld can be maintained by adjusting a plunge depth of pin tool for conventional FSW or distances between upper and lower shoulders for self-reacting FSW processes. Other embodiments of the present invention provide methods and / or apparatus suitable for rotational control and / or plunge depth control for FSW of titanium alloys and / or other high temperature alloys such as super alloys.

The invention relates to the technical field of metal hot processing, in particular to the technical field of production device and production technology for non-quenched and tempered steel forge piece automatic forging. The device comprises a forging system, a feeding system and a discharging system, wherein the feeding system is arranged at the front end of the forging system, the discharging system is arranged at the rear end of the forging system, the forging system comprises an electric heating furnace connected with rear part of the feeding system, a forging pressing machine is connected with the rear part of the electric heating furnace, an edge trimmer is connected with the rear part of the discharging system, and the discharging system is connected with the rear part of the edge trimmer. According to the device provided by the invention, defects in the prior art is overcame, the full automatic line technology that the forge piece is heated once and is controlled by one worker is realized, is energy-saving and cost-reducing, labor saving, the outer surface and the inner quality of the forge piece is improved, and the service life is prolonged; as the mechanical property of each part of the forage is close to one anther, the forge piece quality and safety performance are improved, and the non quenched and tempered steel forging piece is high in tensile strength, fatigue strength and machinability.

The invention discloses a forging molding method for a million kilowatt nuclear power main pipe. The forging process of the method comprises the following steps of a, upsetting; b, stretching; c, single-side marking; d, stretching at two ends and a middle part respectively; and e, final fire stretching. The method adopts the single-side marking technology in the forging process so that a forge piece has two-side asymmetrical deformation in the forging process and then a required eccentric shaft neck can be formed. The forge piece formed by the method can be forged on the main pipe in the forging process to form two joint pipes between which an angle of 45 degrees is arranged, so the processing quality of products can be ensured and the weight of the forge piece can be lightened. Because the size of the forge piece has deformation quantity in the final fire forging process, the grain size of austenitic stainless steel can be ensured. The forging molding method for manufacturing the million kilowatt nuclear power main pipe has the advantages of light required steel ingot weight, low cost and small processing allowance.

The invention relates to a titanium alloy and the field of forming processes, in particular to titanium alloy with matched high strength and toughness and a preparation process of the titanium alloy. The alloy comprises the following components in percentages by weight: 5.5-6.5% of Al, 1.5-2.5% of Sn, 1.5-2.5% of Zr, 2.5-3.5% of Mo, 0.5-1.5% of Cr, 0.5-1.5% of V, 0.1-0.3% of Fe, 0.1-0.2% of O and the balance of Ti and inevitable impurities. The preparation process of the alloy comprises the following steps: step one, carrying out one-heating-number forging in a beta single-phase region at the temperature of 20-50 DEG C above an alloy phase transformation point, wherein forging deformation is about 40%-80%; step two, forging and forming in an alpha+ beta two-phase region at the temperature of 20-50 DEG C below the alloy phase transformation point, wherein the heating number of forging of the two-phase region is controlled to be 1-3, and the accumulative deformation does not exceed 20%; and step three, carrying out heat treatment in a temperature range of 500-600 DEG C. The titanium alloy can be used for manufacturing various types of products such as rods and wires, plates and forge pieces of high-strength and high-toughness titanium alloy, and is applied to the fields of aviation, aerospace, ships and warships and the like with requirements on structure weight reduction and corrosion resistance.

The invention relates to a binocular vision measurement system camera parameter online adjustment method, belongs to the field of computer vision detection and image detection and particularly relates to a binocular vision measurement system camera parameter online adjustment method used for acquiring dimension parameters of a large forge piece in a forging site. The method comprises the following steps: four camera parameter adjustment templates are used, and images of the camera parameter adjustment templates are respectively taken by left and right cameras; then, orthogonal parallel lines in the camera parameter adjustment templates are identified and orthogonal vanishing points are obtained; next, internal parameters of the two cameras are calibrated; and finally, the external parameters of a binocular vision measurement system are simultaneously calibrated. Online adjustment on camera parameters of the binocular vision measurement system is realized, the accuracy of camera parameter calibration is improved, the measuring precision of the measuring system in the measuring process is improved, the method has the characteristics of lower time consumption in the calibration process and high precision, and camera parameter adjustment can be carried out in complicated working conditions.

The invention belongs to the aluminum lithium alloy heat treatment technology, in particular to a heat treatment technology capable of improving the stress corrosion resisting performance of an aluminum lithium alloy. Applicable alloy components of the technology comprise main alloying elements including, by weight percent, 0.5%-5.0% of Cu, 0.4%-2.5% of Li, 0.1%-4.0 % of Mg and 0.1%-4.0% of Zn, comprise microalloying elements including any one to four of, by weight percent, 0.04%-0.02% of Zr, 0.05%-0.60% of Sc, 0.20%-0.80% of Mn and 0.1%-0.9% of Ag and comprise, by weight percent, smaller than or equal to 0.10% of Si, smaller than or equal to 0.10% of Fe, smaller than or equal to 0.10% of Ti, smaller than or equal to 0.05% of each of other impurities and the balance Al, wherein the total amount of other impurities is smaller than or equal to 0.15%. After a deformed product is subjected to annealing treatment, cold deformation of a certain deformation amount is conducted, then solution hardening is conducted, regulation and control over the recrystallization degree and the grain boundary precipitates can be achieved through the manner, and other mechanical properties of the alloy are kept unchangeable while the stress corrosion resisting performance of the alloy is improved. The alloy preparing steps include annealing treatment, cold deformation treatment, solution treatment and ageing treatment. The technology is suitable for high-performance Al-Cu-Li-X series aluminum lithium alloy thick plates and forge pieces used in the fields of aviation, spaceflight and weapons.

Ophthalmic surgical blades are manufactured from either a single crystal or poly-crystalline material, preferably in the form of a wafer. The method comprises preparing the single crystal or poly-crystalline wafers by mounting them and etching trenches into the wafers using one of several processes. Methods for machining the trenches, which form the bevel blade surfaces, include a diamond blade saw, laser system, ultrasonic machine, a hot forge press and a router. Other processes include wet etching (isotropic and anisotropic) and dry etching (isotropic and anisotropic, including reactive ion etching), and combinations of these etching steps. The wafers are then placed in an etchant solution which isotropically etches the wafers in a uniform manner, such that layers of crystalline or poly-crystalline material are removed uniformly, producing single, double or multiple bevel blades. Nearly any angle can be machined into the wafer, and the machined angle remains after etching. The resulting radii of the blade edges is 5-500 nm, which is the same caliber as a diamond edged blade, but manufactured at a fraction of the cost. A range of radii may be 30 to 60 nm, with a specific implementation being about 40 nm. The blade profile may have an angle of, for example, about 60°. The ophthalmic surgical blades can be used for cataract and refractive surgical procedures, as well as microsurgical, biological and non-medical, non-biological purposes. Surgical and non-surgical blades and mechanical devices manufactured as described herein can also exhibit substantially smoother surfaces than metal blades.

The invention relates to a forming process of a lug boss part. A shaping technique of a panel punching forge cold and fine punching compound lug boss part is characterized in including the following steps: 1) the lug boss is pre-shaped on the punching forge cold of the panel; a metal panel (1) is arranged on a cavity die (2) and pressed by using a holding pad (5); a punching force plug (6) drives a squeezing force plug (3) to move downwards under the action of punching pressure to lead the material of the metal panel (1) below the punching force plug (6) to flow into a die space; when the punching force plug (6) moves downwards to reach the lug boss shaping height of the lug boss part, the squeezing force plug is restrained to move; the punching force plug continuously moves downwards; the materials between the punching force plug (6) and the squeezing force plug (3) are squeezed so as to be filled with the die space and pre-shape the lug boss on the metal panel; 2) recoiling recess; 3) finely the profile of the lug boss part is punched to lead the lug boss part to be separated from the metal panel to obtain the lug boss part. The process can obtain the lug boss part with the high precision, the good quality and the low cost.

A linear friction welding head apparatus for dual axis forging, the apparatus including three sets of orthogonal actuators for providing X-, Y-, and Z-planes of apparatus movement for providing Y-axis oscillation, a first forge load along a first forge axis, and a second forge load along a second forge axis. A method for dual axis forging for welding including providing a welding head for applying first and second forge loads along X- and Z-forge axes to weld at more than one interface. The forge loads may be applied at right angles to each other and have magnitudes corresponding to weld interface length.

The invention relates to a ring forge piece punching and cutting composite type mould which is used on a mechanical press, in particular to the ring forge piece punching and cutting composite type mould. In the conventional mechanical manufacturing industry, inner hole punching and outer edge cutting in a forging and forming process of a forging ring of a transmission chain are performed in two steps, the production efficiency is low and the cost is high. The mould consists of an upper mould, an ejector, a lower mould and a material returning and outer burr removing part, wherein an upper mould plate is provided with a guide sleeve, connecting rods and an edge cutting punch head; a lower mould plate is provided with guide posts, an edge cutting female die seat, an edge cutting female die, a punching punch head seat and a punching punch head; a movable plate is provided with a connecting sleeve, an ejector seat and an ejector head and positioned and guided by two guide posts and the guide sleeve; and four connecting rods drive the connecting sleeve, the movable plate and the ejector part to rise so as to eject a finished punched workpiece. The composite mould is matched with a guide post guide sleeve structure, so accurate positioning of the upper mould, the lower mould and the ejector part is realized, the dimensional accuracy of a product is guaranteed, and the mould is suitable for simultaneous edge cutting and punching of a ring forge piece.

The invention relates to a precise forging process for a front upper arm part of a car chassis suspension system. The process comprises the steps of selecting a bar material, and determining the blanking size of a primary blank according to the weight and process of a forge piece; heating in a medium-frequency electrical furnace, and pre-heating an air hammer head and a hammer anvil; stacking the bar material discharged from the furnace for thickening and flattening the bar material on the air hammer, and forming into an approximate cube body by chamfering and forging; performing the first die forging molding on the freely-forged coarse blank on a friction press; cutting off a flying edge on a single-point closed type press, placing into a resistor electrical furnace for heating, performing the second die forging molding on the well-heated pre-forging blank, cutting off a flying edge on the single-point press; thermal refining; and performing shot blasting, flaw detecting and grinding. The process is capable of forming the blank of a more complex part by combining the methods of free forging and die forging, and enables a part concave cavity, a thin rib and a convex lug, which are difficultly formed, to achieve the size precision requirements; and the flow lines are distributed along the shape of the part, the internal structure is uniformly distributed, the grain size is uniform and fine, and the mechanical properties of the product are obviously enhanced in comparison with a cast product.

The invention belongs to the field of iron nickel-based martensite precipitation hardening-type alloys, and in particular relates to deformation induced maraging stainless steel with high strength, high toughness and high corrosion resistance and a machining process thereof. The stainless steel is a novel material mainly applied to the important fields of aviation, spaceflight, machinofacture, atomic energy and the like. The steel comprises the following components in percentage by weight: 11.0-13.0 percent of Cr, 11.0-14.0 percent of Ni, 1.5-2.1 percent of Ti, 0.1-1.0 percent of Mo, 0.5-2.0 percent of Cu, 1.5-2.2 percent of Co, 0.5-1.5 percent of Mn, 0.1-1.0 percent of Si, 1.0-2.0 percent of Al, less than 0.01 percent of Nb, less than 0.01 percent of C, less than 0.01 percent of N, less than 0.01 percent of V and the balance of Fe. The machining process comprises the following steps of: (1) heating and forging in an austenite single phase zone, and air-cooling to the room temperature after the forging is ended, wherein the forge and press ratio is 6-9; (2) hot-rolling after the forging is ended and air-cooling to the room temperature after the rolling is ended, wherein the blooming temperature is 1100-1200 DEG C, and the finished rolling temperature is 800-900 DEG C. The invention obtains a martensite matrix with high-order dislocation density through deformation induced martensite phase change and simultaneously obtains high strength, high toughness and high corrosion resistance through adding the proper matching of precipitation strength elements, such as Ni, Ti, Mo, Cu and the like.

Disclosed is a stator blade machining method of aeroengine compressor with a mounting plate. The stator blade machining method includes adopting a stator blade blank without a mounting plate of a finish forge workpiece, positioning, clamping and machining an air inlet side and an exhaust side on a numerical-control milling machine by a first technical boss, a second technical boss, the end face of the second technical boss and a basin side of a blade body; polishing the air inlet side and the exhaust side, and ensuring that the size and the shape of the air inlet side and the exhaust side conform to the design requirements; positioning, clamping and machining a blade tip and a blade root on a numerical wire-cut machine by the basin side of the blade, the first technical boss, the second technical boss and the end face of the second technical boss, and removing the first technical boss and the second technical boss; finishing the blade tip and the blade root by clamps and removing wire-cut remelting layers on the blade tip and the blade root. By adopting the finish-forging blank, profile tolerance and surface quality of the molded profile of the blade are guaranteed, and the machined blade conforms to the design requirement and is high in yield. The stator blade machining method is simple in machining process, machining efficiency is effectively improved and machining period is shortened.

The invention discloses a ring forge piece material of a wind power rotary supporting ring, comprising the following chemical elements in weight percentage: 0.41-0.45 percent of C, 0.17-0.37 percent of Si, 0.80-1.00 percent of Mn, at most 0.020 percent of P, at most 0.020 percent of S, 1.05-1.20 percent of Cr, at most 0.30 percent of Ni, 0.20-0.25 percent of Mo, at most 0.20 percent of Cu, 0.02-0.04 percent of Al, at most 20ppm of O, at most 2.0ppm of H and Fe as the rest. A wind power rotary supporting ring forge piece manufactured by the material comprises the following technical steps: blanking, forging to manufacture a blank, rolling a ring, hot treating and accurately turning, wherein the hot treating step comprises the steps of hot treatment normalization and hot treatment hardening and tempering. The ring forge piece material is suitable for the ring forge piece of the wind power rotary supporting ring.

The invention relates to a method for simultaneously rolling and expanding two trapezoid-cross-section flange ring forge pieces. The method comprises cutting a cylindrical billet into material sections; heating the material sections from room temperature to austenitizing temperature evenly and keeping warm; then heading, punching and chambering the material sections to be manufactured into ring piece blanks to be rolled and expanded; baking again and heating the obtained blanks to reach target temperature and keep warm; placing the obtained blanks into a hole mould of a ring rolling machine formed by an irregular-shaped driving roller and an irregular-shaped core roller to be rolled, expanded and formed; achieving the ring forge pieces which is narrow at two ends and wide in middle and with the axial height as twice as the height of a target trapezoid flange; cutting the ring forge pieces from the middle of the axial height, symmetrically dividing a work piece into two parts to obtain two trapezoid-cross-section flange ring forge pieces; and finally turning the forge pieces into end product flanges. The method for simultaneously rolling and expanding two trapezoid-cross-section flange ring forge pieces is high in production efficiency, energy-saving, environmental-friendly and capable of improving utilization rate of raw materials and quality of products.

The invention discloses a near-isothermal forging method of a TC17 biphase titanium alloy disc forge piece, comprising the steps of: heating a TC17 titanium alloy disposable bar ingot to 30-75 DEG C below a phase change point, upsetting the disposable bar ingot into a disposable circular cake; heating the disposable circular cake to 20-60 DEG C over the phase change point, and drawing out the disposable circular cake till the length thereof returns the length of the disposable bar ingot to obtain a secondary bar ingot; heating the secondary bar ingot to 30-75 DEG C below the phase change point, upsetting the secondary bar ingot to form a secondary circular cake, then punching to form an annular blank; and heating the annular blank to 20-60 DEG C over the phase change point, heating an upper forging mold and a lower forging mold to 10-20 DEG C below the phase change point, and forging and stamping the annular blank by the upper forging mold and the lower forging mold under the pressure of 30-60mN to make the deformation degree of the annular blank reach 30-50% in the forging molds at a strain rate of 0.001s-1 to 0.01s-1, and then forming a disc forge piece on fire, wherein the heat treatment after forging is the combination of solution treatment and ageing treatment. The disc forge piece forged by using the method has ideal electrical plating basket structure and high performance and is suitable for manufacturing forge pieces of an air compressor chassis, a turbine disc and the like of an aero-engine.