55results about How to "Small ellipticity" patented technology

The invention relates to a heat spraying aluminium zinc alloy wire rod composition and its preparing process, wherein the constituents (by weight percentage) of the wire rod include Al 54-56%, 0.004%<=M<=1.08%, impurity whose total amount is less than 1%, and balancing Zn, M is any one or the combination of RE, Mg, Ti or B.

The invention discloses a cold-drawing and cold-rolling mixed molding method of a stainless steel seamless pipe. The method comprises the following steps: preparing a pierced billet; cutting off the head and the tail of the pierced billet; pickling a pierced billet blank for the first time; coping, cold rolling and unoiling the pickled blank; judging whether the requirements of the finished product are met or not; if so, carrying out annealing treatment; lubricating and cold-drawing a welding head (drive head) of the annealed steel pipe semi-finished product; carrying out solid solution heat treatment on the finished product; straightening, fixing and chopping the finished product; pickling the finished product; carrying out finished product inspection, wherein the finished product inspection comprises the steps: surface inspection, water pressure detection, eddy current inspection, ultrasonic flaw detection, intergranular corrosion testing, grain size testing, tension test, expansion test, flattening test, hardness test, and carbon and sulfur analysis. The stainless steel seamless pipe manufactured by the method is accurate in size, small in ovality and good in quality.

The invention discloses a technique for sizing thick-walled seamless steel tubes through a two-roller skew rolling mill. The sizing technique comprises the steps of (1) adjusting the milling roller distance of the two-roller skew rolling mill to enable the milling roller distance to be 1.01-1.05 times of the outer diameter of a finished steel tube, and adjusting the guide disk distance of the two-roller skew rolling mill to enable the guide disk distance to be 1.02-1.10 times of the roller distance; and (2) sleeving a crude tube on a sizing core rod of the two-roller skew rolling mill, and conducting sizing and rolling and obtaining the thick-walled seamless steel tubes under the action of milling rollers and guide disks. During sizing and rolling, the portion, in contact with the milling rollers, of the crude tube serves as a rolled section, and a gap is always reserved between the inner wall of the rolled section and the sizing core rod. According to the sizing technique, the cost of a sizing skew rolling mill is saved, only core rods with the appropriate diameters are needed, the producing cost is greatly saved, and the sale prospect is improved. Furthermore, the sized seamless steel tubes have the beneficial effects of being high in geometric dimension accuracy, good in straightness and free of crack. The invention further discloses a technique for rolling the thick-walled seamless steel tubes through the two-roller skew rolling mill.

The invention relates to a method for manufacturing a special-shaped ring forge piece of a large wind power flange. According to the method for manufacturing the special-shaped ring forge piece of the large wind power flange, a bar is adopted to serve as a workblank, the workblank in a reasonable shape is obtained by conducting upsetting and punching on the workblank, a rectangular section in the axial direction of a fire diameter and two fire closed cavity special-shaped sections are rolled on the well manufactured workblank in the reasonable shape, and the required part is finally obtained through machining. According to the method for manufacturing the special-shaped ring forge piece of the large wind power flange, metal of all portions in the radial direction and the axial direction of the workblank is distributed three times through upsetting, rolling of the rectangular section and rolling of the special-shaped section. When the method is used for manufacturing the large wind power generation tower flange, the utilization rate of material is high, the production efficiency is high, a larger amount of subsequent machining time is saved, the metal of all the portions, in the radial direction and the axial direction, of the forge piece is evenly distributed, the structural property existing after thermal processing is improved, the quality is stable, and the method is particularly suitable for efficient and mass production of large wind power flanges.

The invention discloses a bend forming method of a large-angle pipeline with high precision, a large pipe diameter and a small bending diameter ratio, and belongs to the technical field of machining. Metal or alloy materials with the low melting temperature are machined to be a core rod, the core rod is assembled into an inner hole of the large pipeline to be bent, the large pipeline and the core rod are simultaneously bent through bend forming, pipe blank which is subjected to bend forming is heated to be at the temperature higher than the melting temperature of the alloy core rod, at a certain temperature below the AC1 temperature of a bent pipe material (or the heating temperature at which the performance of the pipe blank material can not drop obviously), a core rod material in the bent pipe is molten and flows out, and the large bent pipe with the bent section ovality being small, the inner hole surface being smooth and the inner arc being capable of not wrinkling is acquired. The bent pipe low-melting-point core rod technology is suitable for the bend forming of the large-angle pipeline which is high in forming precision requirement, thick in wall, large in pipe diameter and small in bending diameter ratio.

The invention provides a two-step induction heater of a bent tube for oil gas pipeline production, and a method thereof. The apparatus comprises a tube pushing mechanism, a bending mechanism, an electromagnetic induction heating mechanism and a cooling system, wherein double induction coils are arranged in the electromagnetic induction heating mechanism, a first induction coil is used to preheat a tube, a second induction coil is used to further heat the tube on the basis of preheating, and the bending system is used to bend the tube, so the mechanical properties of the bent tube obtained after bending are effectively improved, and many problems frequently appearing in present induction heated bent tube production are solved. The apparatus and the method can be used to produce induction heated bent tubes for high-performance oil gas pipeline production, can improve the tube heating uniformity in the bending process and the production efficiency of the bent tube, improve the dimension precision of the induction heated bent tube, and have the advantages of uniform heating and high production efficiency, and the bent tube produced in the invention has the advantages of excellent performances, small deformation, small ovality and low residual stress.

The invention discloses a flexible sealing structure of a rotary air pre-heater. The flexible sealing structure is a contact type sealing device and comprises a sealing sliding block, a regulation supporting seat and a supporting fixing plate; the sealing sliding block is rotatablely connected with the supporting fixing plate; the supporting fixing plate is relatively arranged on a radial baffle plate of the air pre-heater fixedly; the regulation supporting seat is fixedly connected with the supporting fixing plate; a compression spring is arranged between the regulation supporting seat and the sealing sliding block; the sealing sliding block is in contact with a fan-shaped plate or an axial arc-shaped plate of the air pre-heater; a reset regulation device is arranged between the sealing sliding block and the regulation supporting seat; two ends of the reset regulation device are respectively connected with the sealing sliding block and the regulation supporting seat; and the reset regulation device is used for regulating the maximal resilience modulus of the compression spring positioned between the sealing sliding block and the regulation supporting seat. By using the flexible sealing structure, through regulating the reset regulation device, the regulation of sealing acting force between a moving component and a stationary component in the air pre-heater is realized; the wear of a sealing surface is decreased; and the service life of a quick-wear part is prolonged.

The invention discloses a wiring cutter head. The wiring cutter head comprises a cutter body, wherein a cutter point is arranged on one side of the cutter body; the lower part of the cuter point is a cutter setting surface; the vertical distance between the front side of the cutter setting surface and the point end of the cutter point is 0.1 mm; one end of the cutter setting surface is a diagonal cutting surface inclined towards the direction of the cutter point. The invention further discloses a method for preparing a wire exposed type electric smelting pipe fitting and the obtained electric smelting pipe fitting; the method comprises turning and wiring steps. The thickness of the cutter setting surface is added, the vertical distance between the front side of the cutter setting surface and the cutter point of the cutter head is shortened, the copper wire arrangement depth is shortened, the diagonal cutting surface is arranged on the cutter setting surface, and one side flange is compressed but another side flange is not pressed when the cutter setting surface is used for grinding a copper wire, so that the firmness of the copper wire is guaranteed, a part of the copper wire is exposed outside the inner surface of a plastic pipe fitting and is in good contact with the pipe fitting, the process is realized through the cooperation with a corresponding technology, and the obtained wire exposed type electric smelting pipe fitting is reasonable in copper wire arrangement, firm in the copper wire and small in ellipticity.

The present invention relates to a manufacture method of angle pipe and its special equipment. It is characterized by that one end of steel pipe to be bent is fixed on the mould wheel, the position to be bent and deformed is tightly held by mould wheel, and another end of said steel pipe can be driven by acting force produced by hydraulic or mechanical driving device, so that the steel pipe can be moved forwards and can be bent to form angle pipe.

The invention relates to a production method for electron welding wire of 0.8-4.0mm diameter and its apparatus, which is characterized in the following steps: equipping squeezing barrel, squeezing module, heating element, temperature sensor and reducing die in squeezing head of squeezing press; controlling electronic instrument, relay and actuator by temperature sensor and digital temperature display; power set and heating element compositing temperature detect and control system with control range of 400-420 deg C. The product produced by this technology has the properties of high compatibility of diameter, fineness, rich-looking and quality, and end breaking and self-igniting never happen in the procedure of production.

The invention relates to a tubular electrode with high speed perforated pores, which comprises an outer tube of which the inside is provided with an inner core axially. Further, the inner core and the outer tube are fixed into an integral structure by stretching. Further, the inner core runs through the circle center of the outer tube. Further, the inner core is a rectangular structure which runs through the diameter of the outer tube. Further, the inner core is an integral structure consisting of three fan-shaped tubes with the same semi-diameter, and the semi-diameter of the fan-shaped tube is half of the internal diameter of the outer tube. As a preferred mode, the fan angle of each of the three fan-shaped tubes is 120 degrees, thus not only the processing speed can be improved, but also the electrical conductivity of the outer tube electrode in use can be improved. The tubular electrode is provided with the inner core to not only effectively remove the middle part of the processing pore of the work piece, but also reduce the consumption of the electrode when the electrode is used and consumed. The tubular electrode has the advantages of fast processing speed, good surface smooth finish, high straightness, small ellipticity, good mechanical property and the like.

The invention relates to the field of steel pipe production, in particular to a plug for punching of large-hole series medium- and thick-wall capillaries. The outline of the plug consists of a punching section, an expanding section, a rolling section, a circling section and a reverse cone section. The front end surface of the plug adopts a flat head design, and a bar inserting hole is formed on the tail end of the plug; connection between the front end surface of the plug and the punching section is realized through arc transition, wherein the arc radius is R2, and the arc radius of the outline of the punching section is R3; the expanding section and the rolling section are cones, wherein the taper of the expanding section is a2, and the taper of the rolling section is a1; the outline of the reverse cone section is an arc of which the arc radius is R1; and the circling section is a cylinder.

The invention provides a manufacturing method of a pressure-bearing equipment thick-wall seal head structure. The problem of the discontinuity of the outer surface due to outer surface and slope machining or transition is solved. The main technological process includes the steps that re-inspection of a steel plate is qualified; workblank blanking is carried out; heating is carried out; a head is hot-pressed; heat treatment is carried out; edging is carried out; the shape and position dimensions of an inner sphere are inspected by a template; turning of a circular seam groove 4 and an inner surface 1 is carried out, and slight turning and finishing for the groove outside surface are carried out; and thickness measuring is carried out. The outer surface of the seal head is smooth and continuous, the ovality of the inner surface after machining is decreased, the size of an internal groove is even, and the inner and outer surfaces of the seal head are of good quality.

The invention relates to the technical field of sintering furnaces, and in particular relates to a high-temperature sintering furnace. The high-temperature sintering furnace comprises a furnace body with a heating bar, a workpiece vehicle, a driving mechanism and a lifting mechanism, wherein the workpiece vehicle is arranged at the bottom of the furnace body; the driving mechanism is used for driving the workpiece vehicle to travel; and the lifting mechanism is used for lifting the workpiece vehicle. The high-temperature sintering furnace is characterized in that refractory bricks are tiled at the upper part of the workpiece vehicle along the length direction of the workpiece vehicle; the upper parts of the refractory bricks are provided with hollow refractory bricks; and the hollow refractory bricks are axially and radially provided with through holes respectively. The refractory bricks and the hollow refractory bricks are arranged on the workpiece vehicle, because the through holes are arranged in the hollow refractory bricks, each part of a TC (tungsten carbide) bearing can obtain uniform heat during the heating process, meanwhile, the bottom of the TC bearing in cooling can be cooled down uniformly, the product quality and amount are improved by 50% above, the product hardness is 260-280 degrees, and the ovality is reduced by 40% above.

The invention discloses a cladding mould capable of enhancing combination degree of an outer winding pipe of a krah pipe. The cladding mould comprises a cladding mould body for cladding, a vacuum cylinder and a vacuum pump, the vacuum cylinder is fixed in the cladding mould body in a penetrating mode, and the vacuum pump is connected with the vacuum cylinder. According to the cladding mould capable of enhancing combination degree of the outer winding pipe of the krah pipe, the vacuum cylinder and the vacuum pump are added so that the outer winding pipe is tightly combined with a cladding layer during cladding, and the hardness of the krah pipe can be enhanced.

The invention discloses a mandrel for molding rubber pipes. The mandrel is used for molding the rubber pipes and comprises a central portion, a first layer portion and a second layer portion. The central portion is a cylinder; the first layer portion is a column with the cross section in the shape of a circular ring and is extruded and molded on the central portion; the second layer portion is a column with the cross section in the shape of a circular ring and is extruded and molded on the first layer portion. The mandrel has the advantages that the traditional single layer is changed into a double-layer or multilayer structure, accordingly, the quality of the molded mandrel can be greatly improved even on existing molding equipment, namely an extruding machine, the ellipticity of the mandrel can be lowered, and shrinkage marks on the surfaces of the mandrel can be reduced; novel molding production equipment does not need to be purchased, increase of complicated molding working procedures can be omitted, and increase of the production cost can be prevented; the recycling frequencies of the mandrel can be increased, accordingly, the service cost of the mandrel can be lowered, and the service life of the mandrel can be prolonged.

The invention discloses a TA16 titanium alloy wire processing process. The TA16 titanium alloy wire processing process comprises the following steps of: extracting, rolling, high-temperature rounding,high-temperature drawing and room-temperature drawing, thereby obtaining the TA16 titanium alloy wire with a diameter being Phi 1.0 mm. According to the TA16 titanium alloy wire processing process disclosed by the invention, the high-temperature rounding step is increased, so that ovality of the rolled wire is reduced through a wire rod with a diameter being Phi 9.5 mm while a rolled back-skin wire is heated to a high temperature being about 800 DEG C, and therefore, the yield is increased; the skin of the high-temperature rounded wire is pulled off through a centerless lathe, and skin of thehigh-temperature drawn wire is pulled off through high-temperature wire drawing, so that surface defects can be effectively reduced, and the surface grain size and roughness of the wire are ensured;and compared with a conventional process, the TA16 titanium alloy wire processing process has the advantages of cancelling a plurality of acid-floating and manual-grinding processes in a white-skin wire processing process as well as a process of performing acid-alkaline washing while the wire is drawn to be 3.0 mm, so that the environmental protection purpose is realized, and working hours can bereduced by 1/3.