713results about "Mandrels" patented technology

A binary alloy coating seamless steel tube top and a manufacture method belong to the field of laser processing. Aiming at solving the easy peel-off of molybdenum alloy of a molybdenum alloy top, prolonging service life and reducing cost, the invention melts and coats nickel-base or cobalt-base alloy coating at the nose or working part of the top, melts and coats iron-base alloy coating at the straightening part and the parallel part to obtain a binary alloy coating seamless steel tube top; the preparation of the top has the following steps of manufacturing the top by adopting a casting manner, performing mechanical processing on the cast top and reserving melt thickness of 1.0-3.0mm on the external surface of the top for laser melt process; using nickel-base or cobalt-base alloy to perform laser melt on the top end of the nose part; performing laser melt on the lateral of the nose part as well as the working part with nickel-base or cobalt-base alloy as melt powder, finishing laser melt on the straightening part and the parallel part with iron-base alloy incessantly; performing strain-removal treatment, namely performing mechanical processing of top nose spiracle and finishing laser coating polishing and grinding.

The invention belongs to the field of forging technology, and particularly relates to a thermal treatment process for a 40CrNiMoA core rod and the 40CrNiMoA core rod obtained through treatment. The thermal treatment process comprises three processes, namely normalizing treatment, quenching treatment and tempering treatment, and the 40CrNiMoA core rod is obtained through the three processes. The thermal treatment process adopts the method of normalizing and quenching; through normalizing and accelerating cooling after normalizing, the as-forged particle size can be improved and thick lamellar pearlite can be eliminated, so that quenching is ready; the water-air-water gap cooling method is adopted when quenching cooling is performed, initial water temperature and temperature rise in the process of cooling are strictly controlled; enough quenching severity of a wokpiece is guaranteed to obtain so that a martensitic structure is obtained, while the quenching stress is reduced to the maximum to avoid cracking of the workpiece due to too large stress; a fine and even tempered sorbite is obtained by virtue of high-temperature quenching; relatively high impact toughness is obtained while the high strength is guaranteed; the thermal treatment process has the advantages of being high in production efficiency and low in rejection rate, and improving the impact toughness while ensuring the high strength.

A method and tool for forming a hem flange pre-hem and a final hem on a sheet metal panel wherein elastomeric tooling elements are used to apply radial compression during a forming operation. The elastomeric tooling elements are compressed and apply pressure to a side of the sheet metal panel, for example an aluminum panel, that is stretched during a forming process step. A foil layer may be placed between the sheet metal blank and the elastomeric tooling element to reduce friction and further improve forming performance.

The invention relates to a composite roll forming process of a thick-wall deep-groove ring member. The process is characterized by comprising the following steps of: (1) blank design of the ring member: based on the principle of constant volume, determining the size of ring member blank according to the size of the ring member and the rolling ratio; (2) groove design: designing the sizes of the working surfaces of a main roller and a core roller according to the rolling deformation conditions of the ring member and the equipment structural requirements; and determining the size and position of the working surface of an auxiliary roller according to the sizes of the ring member blank, ring member and the main roller; (3) design of forming parameters: successively designing the rotation speed of the main roller as well as the feed speed and rolling time of the main roller according to the rolling deformation conditions of the ring member and the size of the main roller; and (4) roll forming. Through the invention, reasonable design of the composite roll forming process of the thick-wall deep-groove ring member can be realized, normal stable roll forming of the thick-wall deep-groovering member is guaranteed, the rejection rate and defective rate of the rolling are reduced, and the energy-saving material-saving high-quality and efficient roll forming of the mechanical parts suchas duplicate gears, bilateral flanges, bilateral supporting wheel bodies, high-pressure ball valves and the like is realized.

The invention discloses the rolling technology of a fewer stander longitudinal hot rolling small diameter thin wall seamless steel tube which uses a heating furnace to heat a pierced billet to 950 DEG C to 1150 DEG C, a mandrel trolley pushes a mandrel into the heating pierced billet and is pushed to move forward, and the pierced billet is pushed into a wall reduction rolling unit that is formed by a plurality of wall reduction rolling mills to lead the pierced billet to be carried out longitudinal wall reduction rolling; the pierced billet that breaks away from the mandrel continues to be pushed into a stretch reducing rolling unit that is formed by a plurality of stretch reducing rolling mills to lead the pierced billet to be carried out longitudinal stretch reducing rolling until the rolling is finished; the pierced billet is put into a cold bed to cool; a straightening machine is used for straightening; a finished product is used for delivering and cutting; a flat head machine is used and a detecting machine is used for inspecting; a hydrostatic testing machine is used for detecting; the finished product is bundled and is put in storage. The invention uses the combination of the three-roll longitudinal rolling technology and a retained mandrel to adjust the straight roller longitudinal rolling with umbrella-shaped gears hydraulically and preciously to carries out diameter reduction and wall reduction rolling, and a rolled tube pipeline main control cabinet is used for operating stepless speed regulation of various stands so as to guarantee implementation of the technology, thus rolling the small diameter thin wall seamless steel tube with the diameter of Phi 12mm to Phi 76mm and wall thickness of 1mm to 6mm.

The invention relates to a technique for manufacturing a tube rolling tool of hot rolling seamless steel tube, in particular to a technique for manufacturing a rolling machine mandril of a PQF which belongs to the processing technique of workpiece. The invention provides a novel technique for manufacturing the mandril of a tube rolling; the technical scheme adopted by the technical problem of the invention is as follows: refining a steel ingot-forging and blooming-rolling and shaping-surface rough machining-hardening and tempering processing-fine machining and polishing-surface plating. The technique is characterized in that the rolled mandril has the advantages of smoother surface, less bending degree of a blank as well as a small size tolerance. The technique is characterized in that the basic body of the mandril has a high temperature obdurability and the surface of the mandril has excellent wear-resistance. The technique has the beneficial effects that: the manufacturing technique of the mandril is more reasonable; the potential of a device is fully exerted; the yield rate and the production efficiency are high; the cost is low; the quality of the mandril is excellent; the social benefit is remarkable; besides, the manufacture technique brings broad prospects for manufacturing the mandril of the tube mill.

The invention discloses a new production process of a large seamless steel pipe. The process comprises the following steps: pipe billets are preheated to the temperature of 1050-1290 DEG C by a heating furnace, and delivered to a three-roll skew rolling piercing mill for piercing by a skew roll table conveying mechanism to finish diameter expansion and wall reduction rolling, the maximal ratio of diameter to wall D / S is over 32, and hollow billets are produced; the hollow billets are delivered to a three-roll skew rolling elongating finishing mill by a shift oblique orbit conveying mechanism to finish diameter expansion and wall reduction rolling or diameter reduction and wall reduction rolling, and the pierced billets are rolled, straightened, cropped end, cut to length, defect are detected, and the finished products are obtained after passing inspections. The new production process also perfects and improves the conventional three-roll skew rolling seamless steel pipe process, solves the problems of not rolling thin walls and great extension in the three-roll skew rolling process, the diameter expansion and wall reduction rolling can be carried out, and the diameter reduction and wall reduction rolling can be carried out. The new production process is especially suitable for rolling large and oversized seamless steel pipes (Phi is 500-2000mm), the ratio of single reduced diameter and expanded diameter is more than 30%, the reduced wall diameter is more than 70%, and the reduced wall thickness is 5-7 times of that of a longitudinal pipe rolling mill.

The present invention relates to a making method for a seamless metallic tube with a tilting roll type piercing rolling mill (piercer). According to the making method for a seamless metallic tube of the present invention, the rotary forging effect and the circumferential shearing strain can be significantly suppressed without generating uncompleted engagement of a billet. Accordingly, a product having reduced inside defects and excellent inside quality can be produced in high productivity. Further, by strengthening a plug nose rolling portion, a sharpened plug nose is obtained and an engagement limit can be increased. Additionally, a product further excellent in the inside quality can be efficiently produced. Accordingly, the present invention can be applied to wide fields of the piercing rolling of the seamless metallic tube.

A cooling lubricant device with a removable mandrel bar relates to metal rolling. In order to avoid the abrasion problem on the mandrel bar at high temperature and pressure during the seamless steel tube rolling process, the method of single mandrel bar cooling and single lubricating systems is generally applied, which degrades the quality of the tube inner wall for the low productivity effect and poor lubrication effect. The mandrel of the invention is a hollow rotary body when in operation and inputs the lubricant and cooling water simultaneously into the mandrel bar which is rotating via the insulation and closure structure between a holder and a connector body, with the lubricant ejecting from the front head of the mandrel to lubricate the tube inner wall while the cooling water, so as to form a circuit within the mandrel bar to cool down the temperature for the mandrel bar. When in the rolling process, not only the mandrel bar can be cooled but also the tube inner wall can be lubricated, which can prolong the service life of the mandrel bar and improve the quality of tube inner wall. Besides, the dosage of the lubricant consumption is decreased, cost is saved and environmental pollution is reduced.

A hot stretch wrap forming die typically includes a rigid backing section, a series of spaced ribs extending forward from the backing section, and an elongated face sheet secured to the ribs forward of the backing section with a convex forward-facing die face. The ribs elastically deflect during thermal expansion of the face sheet when a heated metal bar is forced against the die face so that the metal bar transfers heat to the face sheet. The die typically includes stiff ribs secured to the backing section and the face sheet which provide substantially fixed points for the face sheet during its thermal expansion. The face sheet may include several face sheet segments which together form the die face. The face sheet may also include contour plates which form respective portions of the die face and which may be used to adjust the specific contour of the die face.

The invention discloses a steel pipe tandem rolling restraint mandril preparing method, which comprises the following steps: forging / rolling blank; annealing outright; hot straightening; rough / semi-finish; heat hardening; (twice) high tempering; grinding belt; chrome plating; dehydrogenating. The invention reduces the material cost, which improves the blank yield.

The invention discloses the rolling technology of a double-stander oblique hot rolling small diameter seamless steel tube, and the rolling technology of the invention is that a mandrel trolley pushes a mandrel into a pierced billet and is pushed to move forward, the mandrel is heated to 950 DEG C to 1150 DEG C by an intermediate frequency induction heating electric furnace, the mandrel trolley continues to pushes the heating pierced billet into a rolling mill to carry out wall increasing and diameter reducing rolling, only the mandrel and a roller are cooled during rolling process; the pierced billet that breaks away from the mandrel is placed into a reheating electric furnace for heating to 950 DEG C to 1150 DEG C and is sent into a stretch reducing and wall increasing rolling mill to carries out the diameter reducing rolling, the heating while rolling can be realized, and only the roller is cooled during the rolling process; the invention is finished by cooling, straightening, cutting and online detecting after rolling. The invention realizes the technology of heating the mandrel and the roller while rolling and cooling by improving the heating method of a heating furnace, structure and the cooling method of the mandrel and the roller. The rolling technology of a double-stander oblique hot rolling small diameter seamless steel tub improves efficiency, simplifies the technology, reduces cost, saves energy and reduces pollution, thus the rolled steel tube is high in precision.

The invention discloses a piercing plug for a hot-rolled seamless steel pipe and a processing technology thereof, and the piercing plug is processed by the following components by weight percent (the total weight is calculated by 100%): 0.2%-0.3% of C, 0.3%-0.5% of Si, 0.4%-0.6% of Mn, 1.0%-2.0% of Cr, 1.5%-4.0% of Ni, 2.5%-3.0% of W, 0.5%-1.5% of Mo, 2.0%-4.0% of Co, 0.05%-0.1% of Yb, and the balance of iron and inevitable trace impurities. The axial direction of a die of the plug to be poured is mutually vertical to or parallel to and in coincidence with a main shaft of a centrifuge before pouring, and the nose part of the plug faces outward or downward; and molten metal serially enters into a cavity of the die of the plug during the pouring, the rotational speed of a centrifugal casting machine is not lower than 220rpm, and the rotational speed of the centrifugal casting machine is adjusted in the range of 220-300rpm when molten steel is completely injected into the cavity of the die. The piercing plug has the advantages of uniform and compact structure, good high-temperature strength and excellent thermal fatigue performance, and the service life is 1.5-2 times of that of similar products at home and abroad.

The invention discloses a plug of a cladding layer which is made of ceramic-metal composite materials and used for pipe lining machines and a process for preparation. The invention belongs to the application field of metal pipe rolling mills. The cladding layer which is made of the ceramic-metal composite materials and has thickness of 2.5-5mm is clad on the working conical surface of the plug and nasal portion end face through using a cladding method of plasma arcs. The cladding layer and matrix materials are bonded metallurgically with a process that die steel and structural steel are taken as the matrix materials, the matrix materials are processed into a designed size of the plug, the cladding method of plasma arcs is used to enable powder-cored wires to be clad on the working conical surface of the plug and the nasal portion end face under high-temperature effects of the plasma arcs, the cladding layer which is made of the ceramic-metal composite materials and has the thickness of 2.5-5mm is obtained through single-layer claddings and lapping claddings. The geometry size of a nasal portion of the plug can reach a designed size through turning and grinding to the cladding layer. The invention has the advantages of long service life, non-molybdenum and low cost, and the invention increases pipe lining quality.

A piercing and rolling plug has a film composed of oxides such as Fe3O4 and FeO and Fe (metal) as being formed on the surface of the base metal by electric arc spraying using an iron wire whose main component is Fe and, owing to this film, a plug excellent in heat-shielding and seizure-preventing effects can be realized and the lifetime of the plug can be prolonged. Further, in regenerating this plug, a film can be re-formed via the steps of shot blasting of the as-used plug in piercing and rolling and electric arc spraying in that order; thus, it is possible to regenerate the plug at low cost and in a short period of time.

The invention discloses a mandrel cooling device which comprises a box body, multiple groups of support rollers and multiple groups of sprinkling rings, wherein the bottom of the box body is fixed through a support, and water sealing curtains are arranged at ports at two ends of the box body; the multiple groups of support rollers are mounted in the box body and uniformly and linearly arranged in the walking direction of the mandrel in sequence, each support roller in the multiple groups of support rollers comprises a V-shaped roller, a V-shaped support groove, a shoulder pole beam, a rotating shaft and an adjusting mechanism, a rotation center of the shoulder pole beam is fixedly connected with the rotating shaft which is mounted on the box body in a pivot manner and fixedly connected with the adjusting mechanism, the adjusting mechanism is arranged outside the box body, the V-shaped roller and the V-shaped support groove are formed in two ends of the shoulder pole beam respectively, the V-shaped roller comprises two rollers which are oppositely arranged in a V-shaped manner, and the V-shaped support groove is made of soft wear-resisting metal; and multiple groups of sprinkling rings are arranged in the box body, located above the multiple groups of support rollers and communicated with a water way, and further, the sprinkling directions face the mandrel. The mandrel cooling device is applied to a rolled pipe production line, the application range is broad, and the mandrel cooling is uniform and fast.

The invention discloses a limiting mandrel for a mandrel pipe mill, and the limiting mandrel comprises a milling operating section and a tail section in threaded connection with the milling operating section. The milling operating section comprises a cylindrical substrate, an overlay welding layer fixedly bonded on the outer wall surface of the cylindrical substrate, and a chromium plated layer positioned on the surface of the overlay welding layer, wherein the cylindrical substrate is made of low alloy steel; the overlay welding layer comprises the following components by weight percent: 0.30-0.45% of C, 0.7-1.2% of Si, less than or equal to 0.60% of Mn, 4.5-5.5% of Cr, 0.8-1.2% of V, 1.0-1.75% of Mo, less than or equal to 0.25% of Ni, less than or equal to 0.03% of P, less than or equal to 0.03% of S, and the balance of Fe. The manufacturing method of the limiting mandrel comprises the following steps: fabricating the cylindrical substrate; and carrying out overlay welding, carrying out hot straightening, carrying out rough machining, carrying out finish machining, polishing, carrying out chromium plating, dehydrogenating, and carrying out thread phosphorizing. The limiting mandrel provided by the invention has the advantages of light weight, high strength, long service life and low production cost, is convenient to repair and regenerate, and is suitable for being generalized and used in the metallurgical industry.

A mandrel that provides a counter-force to the pressure exerted on the outside of a pipe or other arcuate surface by a friction stir welding tool, wherein the mandrel is expandable through the use of a wedge, and wherein the mandrel enables multiple friction stir welding heads to simultaneously perform welding on the arcuate surface.

The invention discloses a three-roller planetary rolling method for rolling a brass tube. The method is characterized by comprising the following steps of: making the head of a tube blank into a conical surface; selecting a mandril, wherein a unilateral gap L between the mandril and the internal wall of the tube blank is not greater than 2.5mm; before rolling the tube blank by using a three-roller planetary rolling machine, preheating the tube blank to the temperature of between 100 and 500 DEG C first and then feeding the preheated tube blank into the three-roller planetary rolling machine for rolling; spraying emulsified liquid on rollers when rolling, wherein the spraying intensity of the emulsified liquid is of between 0.025 and 0.045MPa; purging by using a purging device arranged at the entrance of the three-roller planetary rolling machine to prevent the emulsified liquid from refluxing so as to prevent the tube blank from contacting the emulsified liquid before entering a rolling region; and processing a tubing rolled out from the exit of the three-roller planetary rolling machine into a finished product by drawing. The method has the advantages that: the brass tube is preheated when rolling, so that the rolling temperature of the brass tube exceeds a medium temperature brittle range of between 400 and 600 DEG C when the brass tube is rolled, namely good quality of a rolled tube body is achieved because of avoiding the medium temperature brittle range.

A process for producing a seamless steel pipe, in which the occurrence of inner surface flaws in the pipe can be reduced through the lowering of the friction coefficient during the elongation rolling by means of a mandrel mill is provided. The reduction of inner surface flaws is accomplished through the use of a lubricant composed mainly of either or both of graphite and mica coated to the surface of a mandrel bar, and another lubricant composed mainly of an alkali metal borate that is applied onto the inner surface of the hollow stock pipe. The temperature of the pipe prior to receiving the lubricant, during lubricant application, and prior to elongation rolling is controlled. The time between descaling or piercing and lubricant application and between lubricant application and elongation rolling is also controlled.

The invention provides a novel glass lubricant of a stainless steel extruded tube. The lubricant is composed of three glasses of a novel glass formulation including exterior coating powder GW8, interior coating powder GN26 and a glass pad GD19 which are respectively acted on a roller coating or spraying coating phase, a broaching phase and an extrusion phase. Compared with the traditional like products, the lubricant provided by the invention has better protecting and lubricating properties. Through utilizing the product provided by the invention, the surface defects of the stainless steel are fewer and the grinding rate can be obviously reduced.

The invention discloses a tappet centering device for a perforating machine, which solves the problems of inaccurate positioning and high possibility of bending of an ejector rod existing in the conventional perforating machine centering device. The device comprises a centering device base frame (7) fixedly arranged on a backstage second-segment base (16) and two lifting screw rod devices (10), wherein upwards output shafts of the two lifting screw rod devices (10) pass through the top surface of the centering device base frame (7) and then are fixedly connected with a supporting roller support (13); two supporting rollers (1) are parallelly arranged on the supporting roller support (13) along the direction of the ejector rod of the perforating machine; an oscillating rod support (3) and a hydraulic cylinder (5) are arranged on a mounting platform (6) respectively; the oscillating rod support (3) is hinged with the middle part of an oscillating rod (4) together through a hinge; the output shaft of the hydraulic cylinder (5) is connected with the tail part of the oscillating rod (4); and a compaction roller (2) is arranged on the head part of the oscillating rod (4). By the device, a tappet can be centered accurately, the requirement of supporting orientation of the ejector rod is met, and the ejector rod is prevented from bending.

The invention belongs to seamless steel tube hot rolling equipment, relates to a mandrel embracing device for rolling steel tubes, and solves the technical problem of the shake of a mandrel bar and a hollow billet in rolling resulted from the unavailability for positioning a pierced billet effectively of the existing mandrel embrace equipment for rolling steel tubes. The equipment comprises a chassis (1), a hydraulic cylinder (2) with adjustable stroke, and a T-shaped swing arm (5), a first V-shaped swing arm (10), a second V-shaped swing arm (12) and a multi-head swing arm (18) which are connected respectively by three connection rods and distributed in a shape of a downward-pointing triangle; and a fixed mandrel B (13) penetrates through the middle parts of the first V-shaped swing arm (10) and the second V-shaped swing arm (12) one after another and penetrates the two together, and a left wander (25), a middle wander (26) and a right wander (26) of the multi-head swing arm (18) are mutually and fixedly connected and distributed in a shape of sector; the equipment is matched with an assorted translation mechanism, thus realizing the operation for simultaneously shifting the specific work piece into and out of the work piece center line, solving the flapping problem for rolling the work piece and improving production efficiency.

The utility model discloses a ship oil way protection device, which comprises an oil pipe and a protection sleeve sleeved outside the oil pipe. The protection sleeve comprises a first body and a plurality of first protrusions arranged on the inner wall of the first body, the first protrusions are distributed around the axis of the first body on the section perpendicular to the axis of the first body, a first recessed portion is formed between two adjacent first protrusions and the first body, and a pressure sensor device is arranged on the first recessed portion. The processing method of the protection sleeve comprises hot penetrating, cold drawing and cold rolling. The core rod for processing the protection sleeve comprises a connection section, a transition section and a working section which are sequentially connected. The working section comprises a cylindrical second body and a plurality of second protrusions arranged on the outer wall of the second body, the second protrusions are arranged around the axis of the second body circumferentially on the section perpendicular to the axis of the second body. Adjacent second protrusions and the second body form a second recessed portion respectively, and a groove communicated with the second recessed portion is arranged on the transition section.

The invention discloses a production method for a high-precision austenite seamless steel pipe. The method comprises the following steps: heating of a circular pipe blank; cross piercing; pipe rolling with a precision pipe mill; sizing; and on-line solid solution treatment; wherein the heating temperature of the circular pipe blank is 1100 to 1200 DEG C, an alloy steel ejector header is employed in cross piercing, the precision pipe mill is used for pipe rolling, parameters of the precision pipe mill comprise a feeding angle of 5 to 6 DEG, a rolling angle of 13 to 14 DEG and ovality of 1.09 to 1.1, two-roller sizing is adopted for sizing, on-line solid solution heating is carried out in a re-heating furnace with a heating temperature being 1060 to 1080 DEG C and insulation time being 1.5 to 2.5 min per one-cm-thick steel pipe wall, and water cooling is used for solid solution cooling. According to the invention, the procedures of cold rolling and cold drawing are omitted, piercing, rolling and heat treatment are carried out in a hot rolling mill, so the purposes of simplification of working process, decrease of cost, shortening of a production period and reduction in pollution are achieved and production efficiency is greatly increased.

The invention belongs to the technical field of production of mandrels and relates to a method for producing a mandrel by utilizing 28NiCrMoV steel as a raw material. The mandrel is formed by sorting, refining, forging, rough machining, heat treatment and fine machining. The method comprises the following steps of: when refining, pouring into a steel ingot in an EAF and LF / VD way, demoulding the steel ingot and hot conveying to forge; before forging, controlling heating temperature to 1,150-1,200 DEG C and controlling initial forging temperature to 950-1,150 DEG C and final forging temperature to 750 DEG C in the forging process; and carrying out heat treatment in a normalizing and tempering process way. In the forging process, the feeding amount and the rolling reduction of an oil press are strictly controlled during upsetting; the mandrel is forged and moulded by adopting a precise forging machine of 1,400 tons during moulding; pulling and striking speed and deflection can be strictly controlled in a process of forging of the precise forging machine; and a heat treatment process is carried out in the normalizing and tempering way, thereby achieving the effect of improving strength limit and impact toughness.