169results about How to "Improves wall thickness uniformity" patented technology

The invention discloses a charging pressing forming method for a variable-cross-section special-shaped pipe, and relates to a forming manufacturing method of a metal pipe. The problems that an existing low-internal-pressure forming technology only can form a pipe with the unchangeable section perimeter, and meanwhile, in the internal-high-pressure forming process of an advanced high-strength steel variable-cross-section pipe, the pressure is high, springback is large, and a mold is seriously worn are solved. The forming method comprises the steps that firstly, an upper expansion mold and a lower expansion mold are assembled on a pressure machine; secondly, the upper expansion mold descends to perform mold assembly, a pipe blank is subject to charging, and the pipe blank expands until the pipe blank is attached to the mold; thirdly, the internal pressure of the pipe blank is relieved; fourthly, an upper pressing block and a lower pressing mold are assembled on a pressure machine; fifthly, the upper pressing block descends to perform mold assembly; sixthly, under the joint action of mechanical pressure of the mold and hydraulic pressure of an inner cavity of a variable-cross-section round pipe, mold attaching is carried out, the variable-cross-section round pipe is formed into the variable-cross-section special-shaped pipe, and the forming process is finished; and seventhly, the internal pressure of the variable-cross-section special-shaped pipe is relieved, and the variable-cross-section special-shaped pipe is cut, so that the variable-cross-section special-shaped pipe meeting the design requirement is obtained. The method is used for forming the variable-cross-section special-shaped pipe.

The invention discloses a forming mold for semi-spherical components and a multi-pass forming method, belongs to the technical field of semi-sphere formation, and solves the problems of corrugation and cracking in deep drawing formation of high-height-diameter-ratio semi-spherical components, difficult control of deep drawing process parameters and weaker wall thickness uniformity in the prior art. The forming mold comprises a concave mold, a convex mold, a blank holder and a positioning plate; the concave mold and the convex mold are used for forming the semi-spherical components; the blank holder is arranged between the concave mold and the convex mold, and is matched with the concave mold to tightly press blanks to prevent corrugations of the blanks in the forming process; the blank holder is provided with a positioning plate; and the positioning plate is used for positioning an upper mold and a lower mold. The forming mold and the forming method are suitable for formation of high-height-diameter-ratio semi-spherical components.

The invention discloses a precise extruding and forming method for a long barrel-shaped component with a base. The precise extruding and forming method comprises the following steps: firstly heating round steel or square steel, which is cut by a saw, in a medium-frequency induction heating furnace, raising the temperature to an initial forging temperature of a material, and removing an oxide skin; then putting the heated square material of which the oxide skin is removed into a concave model cavity for performing extruding and forming, and descending a sliding block of a hydraulic machine so as to complete the operation procedures of the extruding and the forming; entering an extruded and formed blank material into a reverse extrusion forming station, so that the reverse extrusion forming is realized through the quick pressing of the hydraulic machine; pressing the blank material extruded reversely by a press machine, and forming a forward extrusion blank material so as to complete the forming of the long barrel-shaped component with the base in the length direction; putting the formed blank material into a drawing mold so as to form the required barrel-shaped size. According to the precise extruding and forming method, the deformation is greatly reduced, the uniformity of the wall thickness of a forging is improved, the life of a punch is prolonged, and the equipment investment is reduced.

The invention aims to meet the special performance requirements of the existing pipeline steel and overcome the defect of a processing and manufacturing method of a large-diameter seamless pipe, and provides the large-diameter seamless pipe made of X80-grade high-strength and toughness pipeline steel to meet the requirement of an oil and gas delivery pipe used in the complex environment such as low-temperature, corrosion and the like in polar region. The method for manufacturing the large-diameter seamless pipe comprises the following steps: pouring alloy refining molten steel and centrifugally casting to obtain a large-diameter pipe blank; connecting head and tail ends of the pipe blank with carbon-steel circular parts, and grinding and machining the inner surface and the outer surface of the whole pipe blank; heating and removing scale; inserting a mandril into the hollow pipe blank, and positioning; delivering the pipe blank to a periodic rolling machine, and rolling the pipe blank in a reciprocating way to obtain the pipe with a required size; removing the mandril, and cutting off the head and the tail; and heating, sizing and finishing to obtain the finished pipe fitting with the qualified size. The X80 pipeline steel and the manufactured seamless pipe are excellent in comprehensive mechanical properties and particularly excellent in low-temperature impact toughness, and the X80 pipeline steel is suitable for the high-strength and toughness and corrosion resistant large-diameter delivery pipe used in the alpine-cold environment.

The invention relates to a double-boosting type large-curvature coreless bending forming die of a thin-walled pipe and a forming method thereof, and belongs to the technical field of pipe bending andforming. The technical problems that the bending difficulty is large and the pipe yield is low in the coreless bending forming process of the thin-walled pipe are solved. According to the technical scheme, the double-boosting type large-curvature coreless bending forming die is characterized by comprising a bending die, an insert die, a clamping die, a buffering die, a pressure die, an anti-creasedie and boosting dies, wherein the boosting dies are arranged at the tail part of the to-be-bent pipe; the pressure die and the anti-crease die are arranged in the middle of the to-be-bent pipe, anda pressure die groove is formed in the pressure die; the clamping die and the bending die are arranged on the head part of the to-be-bent pipe, and a bending die groove is formed in the bending die; the insert die is arranged on a notch of the bending die; and the buffering die is arranged at the end surface of the head part of the to-be-bent pipe. The invention further provides the forming methodof the bending forming die correspondingly. According to the bending forming die and the forming method, the bending limit of the relative bending radius in the coreless bending process is improved,the wall thickness of the inner wall of the pipe and the wall thickness of the outer wall of the pipe are basically uniform, the distortion degree of the cross section is small, and the requirement for the pipe with a small relative bending radius is met.

The invention discloses a multistage continuous large deformation part internal high-pressure forming method and device. The multistage continuous large deformation part internal high-pressure forming device comprises a preforming mold, at least one subsequent forming mold, a left feeding plunger chip, a right feeding plunger chip, a left liquid inlet and a right liquid inlet. The multistage continuous large deformation part internal high-pressure forming method comprises the following steps of: firstly putting an initial pipe billet in the preforming mold, filling high-pressure liquid into the metal pipe billet through a port sealing device, and pushing the left feeding plunger chip and the right feeding plunger chip under the effect of a horizontal cylinder; carrying out preliminary bulging on a material located in the middle under the coordination effect of axial thrust and liquid pressure, wherein the bulging height of the material is 85%-95% of the bulging height of a forming part, and taking out a middle blank after unloading; secondly, putting the middle blank in the subsequent forming mold, and bulging bulged adjacent positions of the middle blank; and carrying out bulging in sequence from the middle to two ends till obtaining a final forming part.

Disclosed is a manufacturing method for a UNSN08810 iron-nickel-base alloy large-diameter seamless pipe for a high temperature heating furnace. The manufacturing method comprises the following steps that firstly, a square ingot which meets requirements is directly continuous-casted by using an electric arc smelting method, then the square ingot is cogged, then a hollow billet is produced by usinga hot piercing process, finally, through a cold machining process, a matched heat treatment process and a supplemented pipe surface treatment process, and the texture of the pipe is controlled to be uniform, so that the pipe has high performance and high surface quality. The microscopic structure of the pipe is isometric crystal, the grain size is 3-5 grades, the tensile properties of a finished pipe at room temperature are that the tensile strength is equal to or greater than 500 MPa, the yield strength is equal to or greater than 210 MPa, and the elongation is equal to or greater than 50%, and the tensile properties at 650 DEG C are that the tensile strength is equal to or greater than 400 MPa, the yield strength is equal to or greater than 120 MPa, and the elongation is equal to or greater than 50%.

The invention discloses a concrete delivery pipe with high-wearing feature. According to mass percentage, the following materials are adopted: 0.15 to 0.4 percent of C, 0.1 to 2.0 percent of Si, 1.6 to 3.0 percent of Mn, 0.3 to 2.0 percent of Cr, 0 to 0.5 percent of Mo, 0.02 to 0.1percent of V, 0.01 to 0.06 percent of Ti, 0 to 0.03 percent of Ni, 0 to 0.5 percent of Cu, 0.02 to 0.06 percent of Nb, 0.01 to 0.05 percent of Al, 0.0005 to 0.005 percent of B, 0.02 to 0.06 percent of Re, 0 to 0.02 percent of N, 0 to 0.035 percent of S, 0 to 0.035 percent of P and the rest being Fe, and then the steps of smelting, centrifugal casting, hot rolling, controlled cooling, etc. are carried out to the materials. The production process of the invention is simple and short; the produced delivery pipe has martensite and bainite metallographic structure with high-wearing feature and a service life 4 to 20 times higher than No.20 seamless pipe.

The invention relates to the technical field of machining, in particular discloses a follow-up turning device and method of a thin-wall curved generatrix revolving part. The device comprises a mould, a pressing structure, a numerical control system and a turning structure. A part to be machined is put on the mould similar to the part to be machined in curve radian, and is pressed and fixed through a tail tightening piece at the rightmost end; both the pressing structure and the turning structure are pressed against the surface of the part to be machined; and the motion trails of the pressing structure and the turning structure are controlled through the numerical control system, wherein the numerical control system sends a numerical control signal, controls a servo system connected with the turning structure, and drives the turning structure to machine the part to be machined. In the device and the method, a pressing wheel of the pressing structure forms a stable pressing area around a pressing point, and a turning point is positioned in the stable pressing area, so that the part with better wall thickness uniformity can be turned by selecting a pressing wheel with the proper fillet radius, a proper locus of the pressing wheel, a turning tool with the proper fillet radius, a proper locus of the turning tool and a proper turning amount.

The invention discloses a processing and preparing method for a high-strength high-precision Ti6Al4V titanium alloy tube. The processing and preparing method comprises the following steps of: forginga Ti6Al4V titanium alloy bar billet with a uniform and fine tissue, adopting a box type resistance furnace to heat and preserve heat for the titanium alloy bar billet in a beta-phase area; rolling theheated titanium alloy bar billet into a tube billet through an oblique-rolling perforating machine; performing thermal treatment on the rolled bar billet, and performing thermal straightening by a straightening machine; and performing boring treatment on the inner surface of the thermally straightened tube billet, thereby obtaining the finished product titanium alloy tube. Through control on titanium alloy chemical components, especially interstitial elements O and Fe, large-deformation forging and rolling, reasonable heating and rolling temperature selection during processing and follow-up stress-relief annealing, the Ti6Al4V tube can obtain high strength; and thermal straightening and machining parameters are reasonably controlled, so that the prepared tube is good in surface quality, is high in wall thickness uniformity, and is excellent in plasticity; and the method is especially suitable for production of medium-specification high-strength Ti6Al4V titanium alloy tubes.

The invention discloses an auxiliary spinning forming tool for a thin-wall aluminum alloy end socket baffle. The auxiliary spinning forming tool comprises a core mold; a cylindrical spring guide is arranged on the top of the core mold; a to-be-machined flange blank material and a baffle are pressed at the bottom of the spring guide; the baffle is arranged at the bottom of the flange blank materialin a cushioned manner; a C-shaped cantilever is arranged on an outer spinning machine; a baffle frame is fixed to one end of the C-shaped cantilever; the baffle is supported on the baffle frame; a cutter base is fixed to the other end of the C-shaped cantilever; a ball screw is fixed to the cutter base and is sleeved with a screw nut; the screw nut can slide along the ball screw; a rotating motoris fixed to the bottom of the screw nut, and is provided with an output shaft which is sleeved with a spinning roller; and the spinning roller is driven by the rotating motor to rotate.

The invention relates to the technical field of precise hot forming of material difficult to deform in metal material plastic processing, in particular to a die and method for forming a straight tube section-expansion section composite titanium alloy equal-wall-thickness curved generatrix thin wall rotation body component. The problems that according to an existing method, the wall thickness is reduced sharply, axial cracking is prone to occurring, in the forming process, deformation is uneven, and overall performance of the component is reduced are solved. The forming method includes the steps that the shape and size of a variable-wall-thickness tube blank are calculated through theoretical calculation, an original thick wall tube blank is machined, a lubricant and a protective agent are used for performing coating before rotation, the tube blank with the variable wall thickness is formed in a rotary extrusion mode, the mouth part of the tube blank with the variable wall thickness is sheared at an electric spark end, before hot expanding, a lubricant and a protective agent are used for performing coating, and then induction heating is performed on an expanded mouth to obtain the straight tube section-expansion section composite equal-wall-thickness titanium alloy curved gemetratrix component. Evenness of the integral wall thickness of the obtained workpiece is high. The expanding coefficient and overall performance of the component are improved.

The invention relates to a new technique for producing a high alloy steel high-end seamless pipe by adopting cross rolling elongation technology without perforation, comprising: molten high alloy steel which is externally refined is made into a hollow shell by centrifugal casting; the outside surfaces of the front and the rear ends of the hollow shell are respectively processed to be a 'gripping head' and a 'tail end head' with conicity, and machining and quality inspection are carried out on the inside and the outside surfaces as well as the 'gripping head' and the 'tail end head' of the hollow shell; heating is carried out; a mandril is inserted into the heated hollow shell, and then the hollow shell is sent into a cross rolling elongating mill for cross rolling, so that the pipe fittings having the wall thickness, the diameter and the length being in accordance with the requirements can be produced; the mandril is removed, and the head and the tail are cut off; finally, the qualified finished pipes can be obtained after sizing, heat treatment for finished product and finishing operation. The technique has short process flow and does not need cross rolling perforation, thus reducing the cost and improving the quality; due to small tapered treatment for the front and the rear ends, 'tail triangle' is avoided when the medium-thick walled pipes are produced, and the performance of secondary gripping is improved, thus improving the quality of the product and the production efficiency.

The invention discloses a method for automatically carrying out thermoregulation control on a molding mould of an I.S. machine. The method comprises the following steps: A, obtaining a real-time temperature of a glass mould; B, obtaining a preset temperature of the glass mould; C, judging whether to cool the glass mould or not according to the real-time temperature and the preset temperature, if the real-time temperature is higher than the preset temperature, controlling a solenoid directional valve of a cooling gas cylinder to switch on, opening a valve of the cooling gas cylinder, and cooling the glass mould, if the real-time temperature is not higher than the preset temperature, controlling the solenoid direction valve of the cooling gas cylinder to switch off, closing the valve of the cooling gas cylinder and stopping cooling of the glass mould. The invention further discloses a device for automatically carrying out thermoregulation control on the molding mould of the I.S. machine. According to the invention, the on-off of the solenoid direction valve of the cooling gas cylinder, the opening-closing of the valve and the opening of the glass mould are guaranteed to be synchronous, so that the air quantity of the cooling air output to the glass mould by the cooling gas cylinder is effectively controlled, the automatic regulation on the temperature of the glass mould is realized, and the quality of glass products is improved.

The invention discloses a device and a method for hydraulic forming of a cavity part with a complex curved surface, and relates to a device and a method for forming metal plates. The device and the method solve the problem of large welding deformation and welding residual stress in the prior art for stamping and deep drawing of parts with complex curved surfaces and also solve problems that in the initial forming stage, double plate blanks need to be pressed by high mold clamping force to guarantee sealing of liquid at a liquid charging opening, so that the plate blanks at two ends of a cavity are difficult to flow into the cavity of a mold when a cavity part with a complex curved surface is formed, the wall thickness of the part is reduced due to high expansion deformation, and the part is difficult to form by the existing double-plate hydraulic forming technology. The device comprises an upper mold, a lower mold, a lower liquid charge insert, an upper liquid charge insert, an elastic component, a first sealing ring and a second sealing ring, the elastic component and the upper liquid charge insert are sequentially arranged in an upper groove from top to bottom, the lower liquid charge insert is arranged in a lower groove, and the second sealing ring is mounted in a second sealing groove. The device and the method are used for forming of the cavity part with the complex curved surface.

The invention relates to a synchronous high pressure gas bulging forming method for a large size titanium alloy curvilinear generatrix double-layered cone member. High pressure thermal gas bulging forming is carried out on a double-layered cone blank at a special temperature, so that the curved shapes between the inner and outer cones are consistent, the fit clearance is small and a follow-up shape correcting step is not needed. The structure property is regulated then through insulating thermal treatment, the dimensional accuracy is prevented from being damaged by thermal treatment after forming, and the shape accuracy and the structure property are regulated integrally.

The invention discloses a high-temperature thermal power spinning heating method and device. The device comprises a circular sensing ring which is mounted on a rotating wheel frame and moves up and down synchronously with the rotating wheel frame as well as an infrared temperature measuring head; a spinning core mold is sleeved with the circular sensing ring located below rotating wheels; when a pipe blank is mounted on the spinning core mold, the pipe blank is sleeved with the circular sensing ring, and the circular sensing ring is in clearance fit with the peripheral wall of the pipe blank; the infrared temperature measuring head is located between the rotating wheels and the circular sensing ring, that is, the horizontal plane where the infrared temperature measuring head is located is lower than the horizontal plane where the rotating wheels are located and is higher than the horizontal plane where the circular sensing ring is located; when the pipe blank is mounted on the spinning core mold, the infrared temperature measuring head always points to the area on the pipe blank and between the rotating wheels and the circular sensing ring, and the area is an infrared temperature measuring area of the pipe blank; and the circular sensing ring is used for heating the heating area of the pipe blank. According to the device, through the cooperative effect of the circular sensing ring and the infrared temperature measuring head, thermal power spinning forming of the pipe blank can be performed at the relatively high temperature, and thermal power spinning machining of difficult-to-deform metals is realized.

The invention relates to the technical field of hollow component shaping, in particular to a NiAl alloy complicated thin-wall hollow component shaping method. According to the NiAl alloy complicated thin-wall hollow component shaping method, heat treatment of Ni foil is conducted, dislocation and other defect density of the Ni foil can be lowered, the yield strength of the Ni foil is lowered, theelongation of the Ni foil is improved, and harmonious deformation evenness of laminated raw materials is optimized, so a complicated thin-wall hollow component with even wall thickness and excellent performance can be conveniently obtained. An overlapping zone of a first laminated foil is pressed before shaping, an overlapping zone laminated foil based on spreading metallurgical bonding can be formed between the Ni foil and Al foil in the overlapping zone, so the deformation is more even and harmony in a following shaped complicated thin-wall hollow component, displacement or delamination arenot easily caused, and the shaping performance is better. The complicated thin-wall hollow component is prepared in the manner of staggered overlap joint, welding is not required, consistency in constitution of overlap joint seams and other parts of the component can be ensured, the use safety and reliability are higher, the wall thickness evenness is better and the precision of the component is higher.

The invention discloses a 3D hydraulic forming method for a special-shaped sealing ring of an aero-engine. The 3D hydraulic forming method comprises the steps of designing a blank feeding mode, designing a sealing structure of a forming device, designing the blank size, designing a loading path and the mold opening height, and conducting 3D hydraulic forming on the special-shaped sealing ring. Bymeans of the 3D hydraulic forming method, a better forming effect is brought to an 'M' or 'W' or double-corrugated special-shaped sealing ring of the aero-engine, and the precision and the yield of the sealing ring can be remarkably improved.

The invention discloses a useful wrinkle prefabrication method for improving the internal high-pressure forming limit in a pipe, and belongs to the technical field of pipe hydraulic forming. The useful wrinkle prefabrication method can solve the problems that control difficulty and mutual restriction of wrinkles exist in the useful wrinkle high-pressure forming high-expansion-rate pipe fittings made of low-plasticity materials. An induction heating device is used for locally heating a wrinkle-required position of a low-plasticity pipe blank, and after the local temperature of the pipe blank meets the requirement, bending and plastic instability occur in the pipe blank at the heated position under the action of axial material supplementation or under the combined action of internal pressureand axial material supplementation, thus forming the local wrinkles, and the forming continues in such manner until the preforming of all the wrinkles are completed. A useful wrinkle pipe blank is placed into an inner high-pressure forming die, and then pressurized and shaped until the prefabricated wrinkles are completely ironed, attached to dies and formed into final pipe fittings. According tothe useful wrinkle prefabrication method, the dependence on the die structure is avoided, materials are pre-gathered in the inner high-pressure forming areas through the useful wrinkle prefabricating, the limit expansion rate of the pipe fittings is larger after the wrinkles are ironed, and accordingly the distribution of wall thickness is more uniform.

The invention discloses a composite punch device for forming of iso-wall-thickness multi-way tubes, and belongs to the technical field of manufacture of metal hollow members. The composite punch device comprises feed punches. The feed punches are assembled coaxially with liquid filling core rods, and are sequentially connected with guide blocks and hydraulic cylinders. A plurality of liquid guide rings are arranged on each liquid filling core rod. The liquid guide rings are communicated with liquid inlets of the guide blocks. Sealing rings are arranged between the feed punches and the liquid filling core rods. The feed punches can axially move along the liquid filling core rods. The invention further discloses a forming method for the iso-wall-thickness multi-way tubes. Stacking of materials in the middle of a tube blank is effectively reduced, so that wall thickness evenness of the multi-way tubes, especially main tubes, is greatly improved; the composite punch device is simple in structure and convenient to operate, and the forming method is simple and effective; maximum reduction ratio of the wall thickness of the multi-way tubes is smaller than 10%, and the height of each branch tube is more than twice of the diameter of each main pipe.

The invention discloses a method for manufacturing a multi-layer hollow structure through a closed section pipe blank and relates to a method for manufacturing the multi-layer hollow structure to solve the problems existing in an existing method for manufacturing the multi-layer hollow structure, improve the light weight degree of the multi-layer hollow structure and expand the application range of the multi-layer hollow structure. The method includes the main steps that firstly, structural design is conducted; secondly, technology design is conducted; thirdly, prefabricated blanks are prepared, wherein a skin blank and a core pipe blank are formed to the needed skin prefabricated blank and the needed core pipe prefabricated blank; fourthly, assembling is conducted, wherein the formed skin prefabricated blank and the formed core pipe prefabricated blank are assembled into a corresponding assembling structure according to design of the multi-layer hollow structure and a decomposing structure; and fifthly, connecting is conducted, wherein the obtained skin prefabricated blank and the obtained core pipe prefabricated blank in the assembling structure are mutually connected to form an integral connecting piece through a connecting method. The method is used for manufacturing of the multi-layer hollow structure.

Provided is a method for producing a polypropylene-based resin foamed blow-molded article whereby a molded article, which has improved foaming properties and improved blow-moldability of a foamed parison, compared with articles obtained by the existing production methods, and shows a high uniformity of wall thickness over a wide range of density, can be obtained. The method for producing a polypropylene-based resin foamed blow-molded article, which comprises kneading a polypropylene-based resin with a physical foaming agent, extruding the thus obtained foamable resin melt through a die to give a soft foamed parison, inserting the foamed parison in a mold and then blow-molding the same, is characterized in that said polypropylene-based resin comprises a polypropylene-based resin (A) satisfying specific requirements (1) to (3) and a polypropylene-based resin (B) satisfying a specific requirement (4), each in measuring dynamic viscoelasticity imparting a vibration strain at 190 DEG C, and the mixing ratio by weight (A:B) of the resin (A) to the resin (B) is in the range of 100:0.5 to 100:5.