45results about How to "Increase the amount of plastic deformation" patented technology

The invention provides a differential-speed extrusion forming method of a magnesium alloy high performance cup-shaped piece and relates to the technical field of metal and plastic machining and forming. A combined concave die is adopted and comprises a T-shaped upper concave die body and a U-shaped lower concave die body. The T-shaped upper concave die body is internally provided with a cylindrical cavity and installed on the U-shaped lower concave die body, and the section of a formed revolved cavity is shaped like a Chinese character 'shan'. Staggered 'ladder' type differential-speed extrusion steps are adopted for the bottom of the extrusion cavity shaped like the Chinese character 'shan'. Three stages of deformation are conducted, the first stage is the axial similar cylinder pier coarse deformation stage, the second stage is the radial extrusion large deformation stage, and the third stage is the corner extrusion and shearing deformation stage. The extrusion cavity shaped like the Chinese character 'shan' and the staggered 'ladder' type differential-speed extrusion steps at the cavity bottom are adopted for extruding the magnesium alloy high performance cup-shaped piece, the magnesium alloy material forming capacity is greatly improved, a high-density structure is obtained, great plastic deformation is obtained, the grain refining effect is remarkable, the effect of eliminating grain dual-mode distribution of the barrel wall of the cup-shaped piece is obvious, and the fabrication procedure of the high performance magnesium alloy cup-shaped piece is shortened.

The invention discloses a differential extrusion forming die of a high-performance magnesium alloy cup-shaped part and relates to the technical field of metal plastic machining processes and forming. A combined type female die comprising a T-shaped upper female die body and a U-shaped lower female die body is adopted. A cylindrical cavity is formed inside the T-shaped upper concave die body mounted on the U-shaped lower concave die body, and the cross section of a formed revolution body cavity is shaped like the Chinese character 'shan'. Staggered ladder type differential extrusion steps are arranged at the bottom of the extrusion cavity shaped like the Chinese character 'shan'. The magnesium alloy cup-shaped part is extruded through the extrusion cavity shaped like the Chinese character 'shan' and the staggered ladder type differential extrusion steps at the bottom of the cavity, so that the forming capacity of a magnesium alloy material is improved greatly, a high compact structure and large plastic deformation are obtained, the grain refining effect is significant, the effect of removing grain dual modality distribution of the cylinder wall of the cup-shaped part is obvious, and the manufacturing process of the high-performance magnesium alloy cup-shaped part is accelerated.

The invention discloses a method for manufacturing a copper-aluminum double-layer medium-thick composite plate through a cold rolling manner. The method comprises following steps: 1) cleaning an aluminum plate and a copper plate in an immersion manner, removing oil of the plates, drying the plates, and cleaning the composite surfaces of the plates; 2) stacking and compressing the copper plate and the aluminum plate, and riveting the plates at a rolling bite end; 3) rolling the copper-aluminum composite plate blank through a two-roller roughing mill; 4) rolling the copper-aluminum composite plate through a three-roller intermediate mill; 5) rolling the copper-aluminum composite plate through a four-roller finishing mill; 6) rolling the copper-aluminum composite plate through a six-roller finishing mill to reach the required thickness; and 7) annealing the copper-aluminum composite plate. According to the invention, rolling is carried out through the rolling mills provided with working rolls having different roll diameters, so that the plastic deformation is increased, the composite ratio is improved, and a plate shape problem of the copper-aluminum double-layer medium-thick composite plate is solved as the working rolls are different in linear speed.

The invention relates to a method for preparing a semisolid blank, utilizes an improved SIMA (strain induced melt activation) method to prepare the semisolid blank, and belongs to the technical field of metal semisolid blank. The method comprises the following steps of: firstly, measuring a liquid solid phase line point of the semisolid alloy to be prepared, then, heating an alloy blank so as to carry out asynchronization multitrack rolling or pillar squeezing transformation, finally, remelting, and carrying out heat preservation for a long time so as to obtain the required semisolid blank. The asynchronization rolling or pillar squeezing transformation is capable of generating large deformation amount, group bough crystal formed in the blank is destroyed, the asynchronization rolling is utilized to replace pre-deformation processes such as the existing upset, compression, equal diameter angle compression, and the semisolid blank is prepared and has the advantages of uniform formation, high nodularity, and accurate control solid phase rate.

The invention discloses an arc wire feeding additive oblique roller combined wheel hot rolling manufacturing method and device, and relates to the technical field of 3D printing. The wire feeding additive oblique roller combined wheel hot rolling manufacturing method and device are exquisite in structure, high in processing efficiency and good in processing effect, and can refine crystal grains ofan arc additive manufacturing formed part, improve compactness and reduce internal defects, thereby finally improving mechanical properties. The technical scheme of the invention is as follows: the manufacturing method comprises the following steps: (1) initialization; (2) arc wire feeding and material adding; (3) rolling; (3.1) strong shear deformation of an oblique roller; (3.2) primary flattening; (3.3) full flattening; (4) cooling; and (5) cutting of waste edges. The crystal grains of the arc wire feeding additive manufacturing formed part can be refined, the compactness is improved, internal defects are reduced, and the mechanical properties of the part are finally improved.

The invention provides a multilayer metal coupling deformation rolling combined method and device. The device comprises a compound blank heating furnace, a high-pressure water descaling machine, a four-roller reversible rolling mill, a front reeling holding furnace, a rear reeling holding furnace, a front board criss cross bending deformation unit, a rear board criss cross bending deformation unit, a laminar cooling unit and a finished product reeling machine. According to the method, the reeling heating furnaces are equipped in front of and in rear of the single-frame four-roller reversible rolling mill, and the tension bending units are arranged between the front reeling furnace and the rear reeling furnace, the tension bending rollers are flower rollers of which the surfaces are of a convex and concave structure, three flower rollers form a reverse bending deformation unit, and a convex-concave structure of a front roller surface and a convex-concave structure of a rear roller surface are arranged in a staggered mode, so that a temperature controlling reeling coupling deformation rolling combined mechanism used for applying tension and achieving board criss cross bending deformation is formed, residual stress of a compound interface is remarkably reduced, and board shape quality is ensured; and meanwhile, the bonding strength and binding rate of the compound interfaces are greatly improved, the structure performance and comprehensive mechanical performance of composite boards are improved, and the production efficiency and yield are remarkably improved.

The invention discloses a large-deformation composite extrusion preparation method for a magnesium alloy profile for a vertical hydraulic machine. The large-deformation composite extrusion preparationmethod comprises the steps that (1) blanking is conducted; (2) homogenization treatment is conducted; (3) a blank and a die are heated and subjected to heat preservation; (4) a lubricant is smeared,and the blank is placed into a forward extrusion cavity; (5) the blank is forwards extruded into a storage cavity through a calibrating straight; (6) the blank continuously bears pressure to flow tillmaking contact with the bottom of the storage cavity, the blank radially flows, the space in the storage cavity is gradually and fully filled with the blank, and in the process, the blank is subjected to upsetting deformation; (7) under the downward pressing effect of the male die, blank metal starts to flow towards a radial cavity extrusion opening communicating with the two sides of the storagecavity to be subjected to lateral extrusion deformation, and when the stroke of the male die is completed, the lateral extrusion process is also completed; and (8) die release is conducted. Accordingto the large-deformation composite extrusion preparation method, one-time forming of large plastic deformation of forward extrusion, upsetting and lateral extrusion is achieved, thus the strain amount is increased, the stress strain state is enriched, the structure is improved, the structure strength is weakened, production processes are effectively reduced, and the large-deformation composite extrusion preparation method adapts to market economic prospects in China.

A photosensitive resin composition for photosensitive clearance material comprises a resin binder (A), a photo-polymerization compound (B), a photo-polymerization initiator (C) and a solvent (D), the photo-polymerization compound (B) contains a compound of the formula (I) with a content of 5-60 w% in a total amount of resin binder, photo-polymerization compound (B) and photo-polymerization initiator (C). In formula (I), R1-R6 are separately represent H or any group of formula (I-1) to (I-3), at least four groups of R1-R6 are selected from the groups of (I-1) to (I-3) and at least one group of R1-R6 is selected from the groups of (I-2) to (I-3).

The invention discloses an integral extrusion forming die for a thin-walled shell with an inner ring rib. The integral extrusion forming die comprises a combined male die, a combined female die, a cushion block, an ejector rod, a fixed assembly and a movable assembly, wherein the combined male die is formed by a shaft sleeve and a mandrel in a guiding and sliding fit mode; the mandrel is connectedwith an independent power output shaft of a hydraulic machine; the combined female die comprises an inner female die body, an outer female die body and a fixed sleeve; and a hollow discharging cavityis formed in the middle of the inner female die body. The invention further provides an integral extrusion forming method for the thin-walled shell with the inner ring rib. The integral extrusion forming method comprises the following specific steps that (1) a sawing machine is adopted for cutting a bar; (2) homogenization treatment is conducted, and a hollow blank is prepared; (3) extrusion forming is conducted on the thin-walled shell with the inner ring rib; and (4) heat treatment and machining are conducted. The integral extrusion forming die is reasonable in structure, the defects of a traditional machining method can be effectively overcome, the technological process is short, the material utilization rate is high, extrusion forming of the inner ring rib can be achieved, and the mechanical property and the bearing capacity of a component are greatly improved.

The invention discloses a welding method for aluminum and copper. The welding method is characterized by comprising the following steps that a, a cold pressure welding method is adopted; b, an aluminum base material and a copper base material are subjected to annealing treatment before welding, and the annealing temperature is 450-600 DEG C; c, metal oxide films and greasy dirt on the two annealed base materials are cleaned up, the joint surfaces of joints are accurately machined, the surface roughness Ra is 0.8-1.6 micrometers, and the axes are accurately perpendicular to the surfaces; d, an LHJ-15-model cold pressure welder and manual welding tongs are adopted; e, a wire of the aluminum and a wire of the copper adopt overlap joints, the pressure is 800-1200 MPa during overlap joint of the aluminum and the copper, and the pressure is 2400-3000 Mpa during butt joint; and f, after cold pressure welding, welding joints are cleaned, and welding quality inspection is conducted. According to the welding method for the aluminum and the copper, the plasticity is good, and the aluminum joint and the copper joint have high welding quality.

The invention relates to the field of electronic connectors. An automatic electronic connector detecting and packaging production line comprises a rack, electronic connector detecting equipment and electronic connector packaging equipment, wherein the electronic connector detecting equipment and the electronic connector packaging equipment are fixed on the rack, a feeding port of the electronic connector detecting equipment is connected with a feeding station, and a discharging port of the electronic connector detecting equipment is connected with a feeding port of the electronic connector packaging equipment. According to the production line, a connector overturning device is arranged to prevent electronic connectors from falling off during overturning, so that the stability of the overturning process of the connectors is guaranteed; by arranging a connector moving mechanism, the control steps of a carrying device are reduced, and the complexity of the mechanism is reduced; accurate moving of the electronic connectors at different stations is guaranteed by arranging a connector clamping mechanisms; due to the arrangement of the electronic connector packaging equipment, firm connection between a diaphragm and a carrier tape is guaranteed, and the packaging quality of the electronic connectors is improved.

The invention discloses a cold straightening process for improving the straightening capability through the reduction of the number of working rolls of a straightener. In the step of the first pass large plastic deformation straightening, the number of the working rolls actually performing straightening is determined; one or two upper working rolls on the outlet side do not perform straightening; roll gaps of the inlet and the outlet are set; and the roll gap of the inlet is calculated according to a secondary model and based on a condition that a steel plate plastically deforms by 80%. In the step of the second pass small plastic deformation straightening, all the working rolls perform straightening; the roll gap of the inlet is calculated according to the secondary model and based on a condition that the steel plate plastically deforms by 65%; and the roll gap of the outlet is designed to be the thickness of a plate to be straightened. According to the invention, through the reduction of the number of the working rolls actually performing straightening on the outlet side of the straightener, the load of the straightener is reduced, the rolling reduction of the inlet of the straightener is increased, the maximum bending curvature of the steel plate is increased, the straightening capability of the straightener is enhanced, and the straightening qualified rate of the steel plate is improved.

The invention relates to the field of electronic connectors. Electronic connector packaging equipment comprises a packaging rack, a carrier tape conveying device, a diaphragm conveying device, a carrier tape slideway device and carrier tape pressing devices, wherein the carrier tape conveying device, the diaphragm conveying device and the carrier tape slideway device are all fixed on the packagingrack; the carrier tape conveying device and the diaphragm conveying device are connected with the carrier tape slideway device; the number of the carrier tape pressing devices is multiple, and the plurality of carrier tape pressing devices are all fixed to the carrier tape slideway device and are connected with connector diaphragms; the carrier tape conveying device and the diaphragm conveying device are respectively used for feeding carrier tapes and the diaphragms; the carrier tape slideway device is used for conveying the carrier tapes and the diaphragms; the carrier tape pressing devicesare used for press fitting between the diaphragms and the carrier tapes; and according to the equipment, by arranging the carrier tape pressing devices, firm connection between the diaphragms and thecarrier tapes is guaranteed, and the packaging quality of an electronic connector is improved.