94results about How to "Improve deformation uniformity" patented technology

A method for improving deformation and permeability in the high-thickness standard steel plate hot rolling process is characterized in that a uniform fast cooling device is arranged at a position close to the opening of a heavy and medium plate mill or hot strip roughing mill with the length being 5 to 15 meters and the cooling total water being 3,000 to 6,000 cubic meters per hour respectively; before rolling, the cooling device conducts asymmetrical uniform fast cooling to the upper and lower surfaces of a plate blank, a low-temperature hardened layer is formed on the surface of the plate blank, the temperature gradient of a core reaches 2 to 3 DEG C per millimeter, before the cooling returns red, the cooling device can quickly enter the mill to conduct differential temperature rolling, and plate blank core deformation is improved; the cooling device is further combined with asymmetrical rolling, while deepening the plate blank core deformation, the cooling device solves the warping problem caused by the asymmetrical rolling through the asymmetrical cooling of the upper and lower surfaces of the plate blank before rolling. For a steel ball needing two-stage control, the uniform fast cooling device can replace a middle cooling device, shortens or even eliminates the temperature waiting time of swinging steel, and improves the production efficiency.

The invention discloses a forging method of a thin-wall deep cavity airplane hub die forge piece. The forging method comprises a pre-forging method and a final forging method. According to the pre-forging method, a pre-forging die adopted in the method comprises a pre-forging upper male die and a pre-forging lower female die, the depth of the pre-forging lower female die is the same with the depthof a lower female die of a thin-wall deep cavity airplane hub final forging die, the bottom end of the pre-forging lower female die is of a boss structure drawing down from bottom to top, a round groove is formed in the lower surface of the pre-forging upper male die, an annular groove is formed in the edge of the bottom face of the round groove, an annular concave pit is arranged on the outer side of a pre-forging upper male die cavity, bottom surfaces of the annular concave pit and the annular groove are arc, the inclination angle of the outer wall of the pre-forging upper male die is the same with the inclination angle of the outer wall of the upper male die of the thin-wall deep cavity airplane hub final forging die, and the inclination angle of the inner wall of the pre-forging lowerfemale die is the same with the inclination angle of the inner wall of the lower female die of the thin-wall deep cavity airplane hub final forging die.

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 a ring-wave repeated drawing high deformation mold and technology for a plate. The mold comprises two ring-wave mold bodies including the ring-wave mold body A and the ring-wave mold body B, wherein the two ring-wave mold bodies are both of an axially-symmetrical cylindrical structure, the upper surfaces and the lower surfaces of the ring-wave mold bodies are each composedof a plurality rings of convex-concave continuous alternate matchable ring waves, the ring wave radian and length of the axial center are large, the wave height of the axial center is small, and the ring wave radian and length are decreased ring by ring and the wave height is increased ring by ring from the axial center to the exterior. Ring-wave upper mold bodies are movable mold bodies, ring-wave lower mold bodies are fixed mold bodies, and two groups of positioning mechanisms which are radially and symmetrically arranged are arranged at the upper end of each ring-wave lower mold body; and the plate is drawn to be in a set ring wave shape by the ring-wave upper mold bodies and the ring-wave lower mold bodies through mold closing. According to the technology, crystal grains of the plate can be repeatedly drawn, deformed and refined through the mold, and then the size of the crystal grains reaches the micron grade or the submicron grade. The ring-wave repeated drawing high deformationmold is not limited by the plate size, a large-size plate can be machined, and the comprehensive properties of the plate on the physical aspect, the chemical aspect, the mechanical aspect and the likecan be greatly improved.

The invention provides a multi-corner composite equal channel angular twist extrusion die. The die is characterized in that a female die is a cone; an inlet channel, a deformation channel and a spiral channel are arranged inside the cone; the female die is embedded in a die sleeve with identical conicity; the periphery of the die sleeve is sleeved with a heating sleeve; a punch is arranged above the female die in a matching manner; a jack is arranged below the female die. The die has the beneficial effects that the die deforms workpieces put into the inlet channel of the die to a great extent, has high deformation uniformity, low equipment requirement and high work efficiency, meets the requirements of different deformed materials and various deformation temperatures, has the semi-automatic ejection function, is easy to manufacture and can be used for efficiently preparing blocky ultra-fine grain materials with large sizes and high performances.

The invention discloses a differential-temperature rolling method for AlZnMgCu-series aluminum alloy thick plates, and the method is suitable for producing the AlZnMgCu-series aluminum alloy thick plates with thicknesses of 60-120 mm; The differential-temperature rolling method comprises the following steps of: firstly, rolling cast ingots to 180-240 mm by adopting common hot-rolling; cooling surface layers of rolled plates by a spraying mode, and reducing the temperatures of the surface layers of the hot-rolled plates to 300-400 DEG C, wherein the temperatures of the core parts of the hot-rolled plates are higher than those of the surface layers by 50-100 DEG C; and finally, rolling the hot-rolled plates to target thicknesses by adopting large rolling reduction. The method is used for changing deformation resistance of the surface layers and the core parts by utilizing temperature difference between the surface layers of the hot-rolled plates and the core parts of the hot-rolled plates, enables deformation of the surface layers and the core parts of the hot-rolled plates to be uniform, and improves uniformity of the thick plates. The method is simple and convenient to operate, andhas a practical industrial production application value.

The invention discloses a large plastic shape and deformation blank-making method for eliminating anisotropy of a magnesium alloy bar material with the large height-diameter ratio. The large plastic shape and deformation method comprises the steps that (1) an upsetting die is used and is formed by combining space curve faces which combine the symmetrical parabolain in the middle portion of the bottom end of an upsetting male die and the involute at the edge portion, the magnesium alloy bar material is placed in the closed upsetting die for upsetting machining, upsetting deformation is conducted on the magnesium alloy bar material under action of stress, and the alloy bar material is lengthened in the radial direction and is shortened in the axial direction; (2) the blank material after upsetting is put into an extruding die for being extruded and deformed, the blank material is shortened in the radial direction and is lengthened in the axial direction, and a bar-shaped blank material is formed; (3) then after the blank material is extruded, defects at the tail part of the blank material are cut off, the blank material with the defects at the tail parts being cut is put into the upsetting die for upsetting deformation again, and one-time upsetting and extruding process is finished; and (4) the workpiece after upsetting deformation is subjected to upsetting and extruding again, and upsetting and extruding process is repeated by three times. According to the large plastic shape and deformation blank-making method for eliminating anisotropy of the magnesium alloy bar material with large height-diameter ratio, uniform upsetting and blank-making of the large height-diameter ratio bar material without anisotropy is achieved by means of upsetting and extruding repeated circulation large deformation.

The invention discloses a forging method for a near alpha-type high-temperature aluminum alloy large-size bar. A process route of the forging method comprises the following steps: cast ingot upsettingand drawing, first-time alpha and beta phase region upsetting, dynamic beta re-crystallizing and processing, second-time alpha and beta phase region upsetting, alpha and beta phase region stretching,and alpha and beta phase region finished product rounding forming. Dynamic beta re-crystallizing processing is combined in a high-low-high-low forging process, process steps are reasonably designed,and process parameters such as a deformation temperature, deformation amount, a deformation rate and a slenderness ratio are scientifically matched, so that forging deformation of blank is performed to obtain the near alpha-type high-temperature aluminum alloy large-size bar, which has a small and uniform equiaxed structure in core part and side parts, and has good ultrasonic flaw detection uniformity of Phi 250 mm to Phi 500 mm; and moreover, the forging method is short in forging process, is good in yield and is suitable for industrial stable production.

The invention belongs to the technical field of quantum dots, and particularly relates to a quantum dot transfer printing method. The quantum dot transfer printing method comprises the following stepsthat a seal is provided, a deformation embedded body is arranged on a seal surface protruding part of the seal, and the deformation embedded body is obtained in the mode that an initial embedded bodymanufactured by materials containing shape memory polymers are deformed; a quantum dot initial film arranged on the surface of a donor substrate is provided, and the initial film is subjected to transfer printing onto the seal surface, provided with the deformation embedded body, of the seal to form a quantum dot patterned film layer; the seal with the quantum dot pattern film layer subjected totransfer printing makes contact with a target substrate, the deformation embedded body is restored to the initial embedded body, and thus the quantum dot pattern film layer is subjected to transfer printing onto the target substrate. According to the quantum dot transfer printing method, part of pattern residues finally caused by nonuniform stress restoring is reduced, the integrity of transfer printing of the quantum dot pattern film layer is improved, and externally-applied stress required by repeated using of the seal is reduced.

The invention relates to the field of biomedical materials, in particular to a degradable pure magnesium or magnesium alloy oral biological barrier membrane and a preparation method thereof. According to the method, the hole pattern structure design, the pre-forming process and the vacuum annealing treatment are combined, so that the deformation uniformity is improved, the internal stress generated by deformation is eliminated, and the degradation uniformity is greatly improved. A one-film double-coating special surface treatment method is adopted, so that one side of the pure magnesium or magnesium alloy film has a smooth surface, and adhesion and proliferation of epithelial cells or hoof forming tissues are inhibited; on the other hand, a rough surface with an osteogenesis function is obtained, and growth of bone tissues is promoted. In addition, the one-film double-coating further has the asymmetric degradation characteristic, and the corrosion resistance of the smooth surface is more excellent than that of the rough surface; the pure magnesium or magnesium alloy membrane is asymmetrically degraded, so that a stable interface can be obtained on the outer layer of the barrier membrane to shield epithelial cells or hoofing tissues, and meanwhile, the inner layer releases bone ions through controllable degradation to improve bone tissue repair and integration effects.

The invention discloses a serpentine differential-temperature rolling method for improving the deformation uniformity of hot-rolled plate strip steel. The method comprises the steps that a cross shearzone is formed in a deformation zone through cross shear rolling, and the shear stress generated by the cross shear zone facilitates transfer of the deformation from the surface layer to the center;on the basis of cross shear rolling, a slow working roller moves in the rolling direction or moves a rapid working roller in the opposite direction to form a cross shear zone and an anti-bend zone, and the bending of plate strip steel is restrained by utilizing the anti-bend force of the anti-bend zone to form serpentine rolling; steel plates are subjected to ultra-rapid cooling before rolling toform an outer-hard and inner-soft deformation resistance distribution, and differential temperature rolling is additionally arranged on the basis of serpentine rolling to form serpentine differential-temperature rolling; and a rolling deformation zone is formed in the serpentine differential-temperature rolling zone, and a high-frequency pulse current is applied in the rolling deformation zone. According to the serpentine differential-temperature rolling method, the combined effect of the cross shear rolling, the serpentine rolling, the differential-temperature rolling and the pulse current isfully utilized to improve the deformation uniformity of the plate strip steel in the thickness direction, and meanwhile a good plate shape after rolling is ensured.

The invention discloses a method for improving the quasi-[beta] forging deformation uniformity of a titanium alloy high-rib forge piece, which comprises the following steps: S1, before quasi-[beta] forging, performing finite element simulation on an improved pre-forge piece model through software, optimizing the structural size parameters of the improved pre-forge piece model, performing quasi-beta forging simulation calculation, and enabling the deformation amount of a final forging piece model obtained after the improved pre-forging piece model to be subjected to quasi-[beta] forging is within the effective deformation amount range of 20%-40%; S2, performing machining according to the pre-forged piece model data meeting the effective deformation in the step S1, and obtaining an improved pre-forged die; and S3, putting the titanium alloy blank into the improved pre-forging die to be subjected to pre-forging forming, obtaining an improved pre-forged piece, then putting the improved pre-forged piece into a final forging die to be subjected to quasi-[beta] forging, and obtaining a final forged piece. The method can effectively improve the deformation of the high-rib area of the forge piece, so that the deformation of the high-rib part is uniform and consistent with that of the web.

The invention relates to an ultra lapping machining centering fixture for bearing inner ring roller, the thin wall sleeve is opened with an inner ring-shaped groove and sleeved outside the fixture body, the connection mode between the thin wall sleeve and the fixture body is the interference fit connection, the inner ring-shaped groove of the thin wall sleeve, the outer ring-shaped groove of the fixture body and the mobile column are respectively poured with the liquidity plastic, the magnitude of interference delta of the interference fit mode between the thin wall sleeve and the fixture body is 0.010 to 0.012mm, the wall thickness S between the inner wall of the inner ring-shaped groove of the thin wall sleeve and the outer wall of the thin wall sleeve is 0.5 to 0.7mm. The ultra lapping machining centering fixture for bearing inner ring roller is good in elasticity, good in deformation uniformity and high in centering precision and is especially suitable for centering and clamping the bearing inner ring. The coaxiality and airtightness of the thin wall sleeve and the fixture body can be guaranteed. The thin wall sleeve with a taper angle R for 0.5-1.5 degrees is adopted, and then the side of the bearing inner ring and the locating block can be tightly located while centering and clamping the bearing inner ring and the axial direction locating precision of the bearing inner ring is raised.

The invention discloses a forming method of Mg-Gd-Y-Zn-Zr magnesium alloy bidirectional expansion equal channel extrusion blank forming and relates to a forming die of the Mg-Gd-Y-Zn-Zr magnesium alloy bidirectional expansion equal channel extrusion blank forming. The die comprises an upper die seat, a male die and a female die, wherein the female die is arranged below the male die, is of an inverted "T" shape and is formed by communicating a vertical cavity and a horizontal cavity with the same diameter; in addition, a spherical cabin is formed in the intersection part of the vertical cavityand the horizontal cavity, small circular beads are respectively arranged in the joint of the spherical cabin and the vertical cavity and the joint of the spherical cabin and the horizontal cavity, and the vertical cavity is used for accessing the male die. A bidirectional equal channel extrusion structure formed by the vertical cavity and the horizontal cavity is adopted, the spherical cabin is arranged in the channel joint and a multi-pass deformation test is carried out, the compound superposition of the shear deformation in a cavity corner and the heading extrusion deformation in the spherical cabin during a material extrusion process is realized, accumulated plastic deformation process of a material is reached, refinement of a microstructure of a Mg-Gd-Y-Zn-Zr magnesium alloy blank isfinally realized, and the mechanical property of an alloy is promoted.