39results about How to "Fully plastic deformation" patented technology

The invention relates to a molding die for processing high-tension plate parts, which comprises an upper die seat (11), a material press core (13), an upper die fixing plate (14), a lower die seat (15), a convex die (17), a material press plate (18) and an upper die knife block (19), wherein the upper die fixing plate (14) is arranged between the upper die seat (11) and the upper die knife block (19), at least one nitrogen spring (12) is arranged between the material press core (3) and the upper die seat (11), at least two nitrogen springs (16) are arranged between the material press plate (18) and the lower die seat (15), a locking unit (21) is manufactured on the material press plate (18) and the upper die knife block (19), a material plate (20) locked between the material press core (13) and the locking unit (21) in molding can be fully stretched for plastic deformation, and the large springback amount after molding is overcome.

The invention requests for protecting a drawing process and a drawing mould for processing parts made of high intension material. The mould comprises an upper mould, a lower mould, an edge pressing coil and an ejector pin. Aiming at overcoming the disadvantage of the structure of the mould, a drawing gluten on the upper mould or the edge pressing coil is changed into an independent process bulging gluten, which is fixed on the two sides of the lower mould. And a groove for the process bulging gluten to pass through is corresponding opened on the edge pressing coil. The height of the process bulging gluten is about larger than that of the binder surface of the edge pressing coil when the edge pressing coil runs to a lower dead point, and the process bulging gluten is controlled to be higher than the binder surface of the edge pressing coil for 10 to 25 mm or so. The lower end of the process bulging gluten is connected with an adjusting gasket. The invention is mainly applied for molding parts of high intension whose tensile strength is more than 600MPa, and makes the plates fully plasticizing deformed in the drawing process of the parts made of high intension material so as to reduce the possibility that the parts are rebounded and twisted, thereby achieving the purpose that the size of the parts is fixed.

The invention relates to the field of material-surface modification, particularly to a special material for stainless steel substrates composite coating for a thin valve plate and a preparation method of the special material. According to the special material for the stainless steel substrate composite coating for the thin valve plate, stainless steel metal powder is used as a composite coating bonding phase, and the wear resistance is improved through the introduction of hard-phase particles, wherein the stainless steel metal powder is 316L stainless steel powder, the hard-phase particles are WC, and the composite coating comprises the following elements in percentage by weight: 8-9% of Cr, 5-6% of Ni, 1-2% of Mo, 42-43% of W, 2-3% of C, and the balance of Fe. The wear-resistant corrosion-resistant stainless steel substrate composite coating which is disclosed by the invention, is prepared by a method based on cold spraying, the characteristic of low-temperature deposition of the cold spraying is kept, so that undesirable phenomena, such as decomposition, oxidation, phase transition, crystal grain growth and the like, of the coating material, which are caused by high-temperature deposition techniques, such as laser cladding, hot spraying and the like, are avoided.

The invention relates to the field of ceramic coating and surface engineering, in particular to a method for preparing a Ti2AlC phase ceramic coating through cold spraying in-situ formation. The preparation method can be applied to an MAX phase material system capable of being synthesized through pressureless sintering and is specifically explained through the preparation method for the Ti2AlC phase ceramic coating. The preparation method comprises the steps that firstly, raw material powder for sintering and preparing the coating is mixed according to the required proportion; secondly, an organic solvent and an adhesive are added into the mixed powder to form slurry through wet ball grinding; thirdly, the slurry is dried into spherical raw material powder through a spray drying granulation method; fourthly, the spherical raw material powder is deposited on a base material where the coating needs to be prepared through a cold gas dynamic spraying device; and fifthly, the deposited base material and the coating are sintered under a vacuum atmosphere, and an in-situ formation MAX phase ceramic coating can be obtained. The method for preparing the MAX phase ceramic coating through cold spraying in-situ formation has the characteristics that the prepared coating is large in thickness and good in quality, the powder deposition speed is high, no MAX phase decomposition reaction occurs in the process, using is convenient, and the method is suitable for large scale application.

A short pressure reinforcing process of struck buffer elastic spring. The process adopts repeating the way of short pressure reinforcing process when mechanic reinforcing. The elastic spring can be completely plastometric set so that it reaches content force output property and increases endurance life. The process is used for parts with big lead angle and high load which cannot be processed by short pressure and halt.

The invention discloses a high-quantity hafnium rod manufacturing method. The method includes the steps that a hafnium rod blank is wrapped with a steel pipe, then the steel pipe is wrapped with a copper pipe, and the double-wrapped hafnium rod blank is obtained; secondly, the double-wrapped hafnium rod blank is extruded after the rod blank is heated and the temperature is kept, and the extruded rod blank is obtained; thirdly, the copper pipe and the steel pipe wrapping the extruded rod blank are removed, and then the extruded rod blank is subjected to vacuum annealing treatment; fourthly, under the condition that the extruded rod blank is heated continuously in the atmosphere, the extruded rod blank is rolled through a heat pipe rolling machine; fifthly, oxide coatings are removed, then the extruded rod blank is straightened, ground and polished in sequence, and a semi-finished hafnium rod is obtained; and sixthly, vacuum annealing treatment is conducted, and a finished high-quality hafnium rod is obtained. By the high-quantity hafnium rod manufacturing method, the hafnium rod blank is double-wrapped before being extruded, and the hafnium rod blank is rolled through the heat pipe rolling machine under the condition that the extruded rod blank is heated continuously in the atmosphere, and the hafnium rod with the dimensional deviation ranging from -0.02 mm to 0.02 mm, the ovality smaller than or equal to 0.02 mm and excellent mechanical property and corrosion resistance and of an even structure can be obtained.

The invention discloses a method for manufacturing an X 90 grade pipeline steel large-diameter thick-wall spiral submerged-arc welding pipe. The method comprises the following working procedures: uncoiling, flattening, edge milling, forming, welding, pipe end expanding, X-ray continuous detection, static hydrostatic testing, weld joint and base metal ultrasonic flaw detection, pipe end chamfering, pipe end shooting and finished product inspection; the welding working procedure comprises inside and outside prewelding, finish inside and outside welding; through reasonably selecting welding parameters, a weld joint and base metal can transit smoothly to reduce or eliminate undercut, and the weld joint has excellent mechanical property and ensures obdurability match of the welding pipe and a welded joint; while the pipe end expanding working procedure is carried out, an automatic spiral submerged-arc welding pipe perimeter measuring device is adopted to measure the perimeter in real time, so that real-time measurement and monitoring on the welding pipe perimeter during the forming process are realized, and precise geometric dimensioning of the welding pipe is ensured.

The invention relates to an automobile door internal plate understructure which comprises a door opening seal region (1), a side wall seal region (3) and a binding flange region (4), wherein a step (2) is additionally arranged between the side wall seal region (3) and the binding flange region (4); the upper and lower round angle roots of the step (2) are provided with a drainage hole (5) in a penetrating mode; and the drainage hole (5) is manufactured by positive punching. The automobile door internal plate understructure has the advantages that the step is additionally arranged between the side wall seal region and the binding flange region, and the step is provided with the drainage hole, thus the traditional wedge mode is changed into a positive punching mode and the mold cost is greatly lowered.

The invention discloses an isotropous rolling method for an ion-based high-temperature alloy rectangular ring part. The isotropous rolling method comprises the following steps: firstly, heating an iron-based high temperature alloy rod to a forging temperature, and carrying out upsetting, punching and pre-rolling on the iron-based high temperature alloy rod to prepare rectangular ring blank; filling the rectangular ring blank into ring rolling machine, lifting a tapered roller by a height h being 5mm-10mm for tilting the rectangular ring blank; then, rolling and shaping the rectangular ring blank to obtain the ion-based high-temperature alloy rectangular ring part. According to the method, by changing the flow direction of materials during rolling, isotropous mechanical properties of the rectangular ring part are kept consistent, so that the comprehensive mechanical properties of the rectangular ring part are improved. The method is used for producing the isotropous ion-based high-temperature alloy rectangular ring part.

The invention relates to the technical field of fuel cells, and provides a preparation method of a metal bipolar plate of a proton exchange membrane fuel cell. According to the invention, the metal bipolar plate is prepared by adopting a method of firstly coating, then welding and finally hydroforming, so that the uniform thickness of the coating can be ensured, and the consistency of corrosion resistance and contact resistance of each part of the bipolar plate is ensured; and when the two layers of metal plates are welded, one non-welding area is reserved on each of the two sides, during hydraulic forming, the non-welding areas serve as liquid injection holes to inject high-pressure liquid between the two layers of metal plates, under the action of hydraulic pressure, the upper layer of metal plate is attached to the cavity wall of an upper mold plate, and the lower layer of metal plate is attached to the cavity wall of a lower mold plate, so a cathode plate and an anode plate are formed at the same time. When the method is adopted for hydraulic forming, the coating cannot be damaged, the formed runner is high in precision, the product percent of pass is high, and simultaneous forming of the cathode plate and the anode plate is achieved for the first time.

The invention discloses a rolling method for a rectangular isotropous stainless steel ring piece. The rolling method includes the steps that firstly, a stainless steel rod is heated to the forging temperature to be upset, punched and pre-rolled, and a rectangular ring blank is manufactured; and secondly, the rectangular ring blank is put into a ring rolling machine, a conic roller is lifted up by 5 mm to 10 mm, the rectangular ring blank is inclined, then rolling forming is conducted, and the rectangular stainless steel ring piece is obtained. By the adoption of the method, the flowing direction of materials in the rolling process is changed, and isotropous mechanical performance of the rectangular ring piece is kept the same, so that the comprehensive mechanical performance of the rectangular ring piece is improved. The method is used for producing the rectangular isotropous stainless steel ring piece.

The invention relates to a method for using a balance mandril in the drawing process for processing an asymmetrical component of a high tension material. The method comprises that: a mould is arranged and locked on a machine while the balance mandril is arranged at one end with smaller stress during mould forming; an upper mould and a sliding block of the machine are locked and move downward, and when the upper mould and plates on a blank holder contact, the height of the balance mandril is adjusted to contact the sliding block of the machine simultaneously; the upper mould contact and press downward the blank holder, the mandril descends along with the action of upward pressure at the same time, and at the moment, the balance mandril supports the action of balanced force and descends together; and the upper mould continuously descends to ensure that the mould moves to a lower dead center and the balance mandril descends to the lowest at the same time so as to press the plates and complete shape curing of the component. The method is mainly suitable for forming plates with more than 600MPa of tensile strength, high tension and left-right asymmetry, can ensure that the plates are subjected to full plastic deformation, and reduce tendency of component rebound and distortion, thereby achieving the aim of size curing of the component.

The invention discloses an isotropic rolling method for an aluminum alloy rectangular ring. The isotropic rolling method comprises the following steps: firstly, heating an aluminum alloy bar till a forging temperature, and carrying out upsetting, piercing and pre-rolling to form a rectangular ring blank; secondly, loading the rectangular ring blank on a ring rolling mill, lifting a conical roller by h=5mm-10mm to tilt the rectangular ring blank, and then carrying out rolling forming to obtain the aluminum alloy rectangular ring. Such a method is capable of keeping the mechanical properties of the rectangular ring consistent in all directions by changing a flowing direction of a material during rolling, thereby improving the comprehensive mechanical properties of the rectangular ring. The method is used for producing the isotropic aluminum alloy rectangular rings.

The invention discloses a rolling method for an isotropic high-temperature nickel base alloy rectangular ring. The rolling method comprises the following steps: first, a high-temperature nickel base alloy bar is heated to a forging temperature, and after being upset, punched and pre-rolled, the heated high-temperature nickel base alloy bar is made into a rectangular ring blank; and then, the rectangular ring blank is loaded on a rolling mill, and cone rollers are lifted by h which is 5-10 mm, so that the rectangular ring blank inclines, and next, the inclining rectangular ring blank is rolled to obtain the high-temperature nickel base alloy rectangular ring. According to the rolling method, the mechanical properties of the rectangular ring are enabled to stay the same by changing the flowing direction of a material in rolling, so that the comprehensive mechanical properties of the rectangular ring is improved. The rolling method is used for producing isotropic high-temperature nickel base alloy rectangular rings.

The invention discloses an isotropic rolling method for a structural steel rectangular ring. The isotropic rolling method comprises the following steps: firstly, heating a structural steel bar till a forging temperature, and carrying out upsetting, piercing and pre-rolling to form a rectangular ring blank; secondly, loading the rectangular ring blank on a ring rolling mill, lifting a conical roller by h=5mm-10mm to tilt the rectangular ring blank, and then carrying out rolling forming to obtain the structural steel rectangular ring. Such a method is capable of keeping the mechanical properties of the rectangular ring consistent in all directions by changing a flowing direction of the material during rolling, thereby improving the comprehensive mechanical properties of the rectangular ring. The method is used for producing the isotropic structural steel rectangular rings.

The invention discloses a circular pipe plastic connecting device. The device comprises a feeding mechanism, a fixed clamping mechanism and a circumferential loading mechanism, through a motor and a chain wheel, rotating motion of the motor is converted into linear feeding motion of the chain wheel, so that a pipe is placed at a preset position, and a pressing block is further driven by an air cylinder to circumferentially clamp the pipe; under the driving of the motor, the movement of three groups of opposite rolling devices is controlled by utilizing accurate transmission among gears, the movement is synchronous, and repeated and cyclic loading is carried out for multiple times; and due to the design of a special fixture for the pipe and the adoption of a rolling type local progressive loading manner, the excellent performance and the production efficiency of a product are greatly improved.