40results about How to "Uniform refinement" patented technology

The invention relates to a device and a method for preparing fine-grained material by directly extruding a continuous variable cross section, which relate to a device and a method for preparing fine-grained material. The invention solves the problems of the traditional fine-grained material preparation methods that the procedures are complicated, the process requirements are high, the texture orientation is significant, the defects of folds and material interface superposition are easy to occur in processing and preparation and the preparation methods are difficult to be implemented in production. A primary transition die cavity, a secondary transition die cavity and a core die cavity of the preparation device of the invention are combined to form an axial corrugated extrusion cavity of the continuous variable cross section; the preparation method of the invention comprises the following steps: the preparation device is assembled; an ingot is arranged in a female die, a punch head is put it, a punch head is put in, the die orifice on a core die extrusion end is closed, the punch head descends, the ingot is extruded form a primary transition die orifice and a secondary transition die orifice, the punch head continues to descend, and the ingot is upset and deforms; and the closure is removed, the punch head continues to descend, and the ingot is extruded and formed. The invention requires simple equipment and few production procedures, and is easy to be implemented and popularized in production.

The invention provides a method for forming micro-texture in a composite mode on the inner surface of a cylinder sleeve through laser. The method comprises the following steps: step (1), a femtosecond laser device is used for processing a needed microcosmic shape on the inner surface of the cylinder sleeve; and step (2), a nanosecond laser device is used for strengthening the area of the microcosmic shape processed in the step (1) through laser shock waves. Under the condition of dry friction, micro-concave surface texture can be used as a storage device for storing wear particles to reduce abrasive wear and furrows on the friction surface, and therefore the wear rate is lowered. The laser shock waves can eliminate residual tension after the micro-texture is formed on the inner surface of the cylinder sleeve, and therefore deep residual compressive stress is formed, grain refinement is enabled to be more uniform, the hardness, the abrasive resistance and the anti-fatigue performance of the cylinder sleeve are improved, and the service life of the cylinder sleeve is prolonged. The invention further provides a device for forming the micro-texture in the composite mode on the inner surface of the cylinder sleeve through the laser at the same time.

A method of manufacturing a semiconductor wafer wherein a film is formed on a back surface of a starting semiconductor wafer formed with circuits in a front surface thereof. To prevent the semiconductor wafer from warping even when it is worked as very thin as 100 μm or below and to form the film uniformly on the back surface of the semiconductor wafer, the method includes a unification step of supporting the front surface of the semiconductor wafer on a support baseplate having a flat support surface, and then unifying the support baseplate and the semiconductor wafer with each other, a grinding work step of grinding the back surface of the semiconductor wafer to thin; and a film formation step of forming a film on the back surface of the semiconductor wafer with use of a film formation apparatus; wherein a protective tape capable of being tom off is stuck onto a back surface of the support baseplate at said unification step, so as to perform the subsequent grinding work step with the protective tape borne on the support baseplate; and a protective-tape tearing off and removal step of tearing off and removing the protective tape is carried out before performing said film formation step.

The invention discloses a multi-curvature forming method for a stainless steel cylinder. The method is characterized by comprising the following steps: performing scribing and blanking according to the developed length of the medium diameter of a cylinder to be wound; machining peripheral welding grooves of a plate; rolling-forming a first-curvature circular arc, namely reserving a straight section, not to be wound for the formation of a circular arc, with a width B of 200 to 600 mm at each of the two ends of the cylindrical plate, and bending and winding the middle part of the cylindrical plate into a large circular arc with a curvature radius R of more than or equal to 0.5 Phi to form the first-curvature circular arc of the cylinder; rolling-forming second-curvature circular arcs, namely rolling the parts between the roots of the straight sections with the widths B of 200 to 600 mm and the large circular arc into circular arcs with curvature radiuses r of 0.2 to 0.5 Phi to form second-curvature circular arcs; rolling transition parts between the second-curvature circular arcs and the first-curvature circular arc into smooth transition; performing rolling until the grooves 2 in the two ends of the straight sections get close to each other; performing longitudinal seam assembly and welding on the cylinder, placing the cylindrical body at a horizontal position, and welding longitudinal seams; performing roundness correction on the cylinder after welding.

The invention relates to a preparation method of dried beancurd stick and dried beancurd stick prepared thereby. The preparation method comprises the following steps: 1) grinding peeled soybean into soybean milk; 2) carrying out homogenization treatment on the soybean milk and preparing the homogenized soybean milk; 3) adding a mildew preventive and a film-forming agent in the homogenized soybean and carrying out heating and milk boiling treatment; and 4) heating, uncovering bamboo and forming. The method adopts a water grinder for grinding and high-pressure homogenization, and improves the dissolution rate of protein, thus improving the yield of the dried beancurd stick; film-forming agent Curdlan is added in the homogenized soybean milk so as to accelerate the film forming speed; and mildew preventive calcium propionate is added to effectively restrain the growth of the mould, and prolong the shelf life of the dried beancurd stick. The invention has the advantages of low cost, simple and easy technique and larger application and promotion values.

The invention is based on a method for aligning an electronic CMOS structure with respect to a buried structure in the case of a bonded and thinned back stack of semiconductor wafers. The method is intended to avoid “front side to rear side” alignments. The proposed method for aligning the electronic CMOS structure uses the formation of alignment marks (7; 7a, 7b) in the process of fabricating the structure to be buried on a front side, which is used for bonding of the semiconductor wafer (1), which includes the structure (2) to be buried. The alignment marks (7) are formed on the edge of the semiconductor wafer. A cover wafer (5) is provided with first thinned portions (10a; 10b) of the wafer thickness provided from the bonding side at positions corresponding to positions of the alignment marks (7). A plan view of the alignment marks (7) is obtained after wafer bonding. For this purpose, the first thinned portions of the cover wafer (5) made from its bonding are formed so as to recess an edge of each thinned part of the cover wafer (5). A second thinning of the cover wafer (5) of the wafer stack (6) obtained by the bonding is performed to a certain measure, thereby making the alignment marks (7; 7a, 7b) visible. Aligning masks for fabricating the electronic structure (40h) may be accomplished on a surface (8a) of the thinned cover wafer (8) by means of the alignment marks (7; 7a, 7b).

A wheel rolling bearing unit has a hub spindle having flange and shaft-shaped sections, an inner-ring raceway surface on the outer peripheral surface of the shaft-shaped section; an outer ring member disposed around the outer periphery of the shaft-shaped section, an outer-ring raceway surface on the inner peripheral surface thereof; and rolling elements between the inner-ring raceway and outer-ring raceway surfaces. The flange section is on one side of the spindle in a rotation axis direction thereof; on the flange surface, a cylindrical spigot joint section protruding on one side is coaxial with the spindle; the boundary section of the flange surface and the outer peripheral surface of the spigot joint section has an arc-shaped boundary surface to connect smoothly toward the flange surface. The surface roughness of the boundary surface is finer than that of the flange surface and the outer peripheral surface of the spigot joint section.

The invention discloses a hot extrusion device for molybdenum and molybdenum alloy. The hot extrusion device comprises an extrusion die, the extrusion die is internally provided with an extrusion channel, and the middle of the extrusion channel retracts; the extrusion die is sleeved with a heat-preservation preheating device; the hot extrusion device further comprises a vertical hydraulic press and a pair of overturn extrusion devices, the overturn extrusion devices are used for turning over and laterally extruding the extrusion die, and the vertical hydraulic press is used for longitudinallyextruding and heating the molybdenum or molybdenum alloy in the extrusion channel. The invention further discloses a hot extrusion method for the molybdenum and molybdenum alloy. The method comprisesthe steps of preheating of the extrusion die, die combination and preheating, extrusion molding and 2-5 times of repeated extrusion molding. The hot extrusion device can unevenly extrude the molybdenum and molybdenum alloy in three phases, and large-sized even grain-refined molybdenum and molybdenum alloy are obtained; by means of the hot extrusion method, obtained finished materials of molybdenumand molybdenum alloy can be even in structure and refinement degree.

The present invention discloses a nickel-rhenium alloy rotary tubular target containing trace rare earth elements and a preparation method thereof. The target comprises the following components in percentages by mass: Re 2-5%, Zr 0.02-0.1%, B 0.05-0.1%, Mg 0.01-0.05% and balance of Ni and inevitable impurities. The preparation method includes the processes such as vacuum melting, atomization ingotting, sintering, hot isostatic pressing, hot forging, hot rolling, cross roll piercing, annealing and machining. The invention is the rotary tubular target; the utilization rate of the material is improves; furthermore the target microstructure is fine and uniform; and the quality is higher. The invention is the integral target with low gas content and high purity; the target can return to a furnace as the returned material even after use; and the cost is saved.

Articulated dunnage having at least two corner support portions joined along a hinge. The dunnage is movable between an open orientation and a folded configuration. The dunnage may be formed in the open configuration so that the dunnage is biased in the open orientation by the shape memory of the polymeric material. The dunnage is configured to be fitted around a portion of the article and to extend between adjacent corners of the container when in the folded configuration. The present invention also provides a method for packaging using articulating dunnage including the general steps of (a) placing the dunnage in the open configuration on the container over the opening, (b) moving the article into engagement with the dunnage, and (c) inserting the article and dunnage into the container through the opening, the action of inserting the article and dunnage into the container causing the dunnage to move from the open configuration to the closed configuration.

The invention discloses an intermittent ultrasonic reaction device. The intermittent ultrasonic reaction device comprises a protective cover, ultrasonic acoustical systems, a screw, a first throttle valve, an ultrasonic transmitting groove, first bolts, a four-way flow dividing pipe, pressure nozzles, first clamp nuts, a gas-liquid exchange reaction chamber, gas guide holes, second bolts, lead screws, third bolts, a cover, second clamp nuts, a supporting ring, double nuts, a second throttle valve, a third throttle valve, a fourth throttle valve, a fifth throttle valve, a booster pump, stirring paddles and a circulation liquid storage groove. According to the intermittent ultrasonic reaction device, under the action of ultrasonic cavatition, reaction liquid is refined more evenly and finely; in the crystallization process, crystal grains can be effectively refined, and the crystal grains can be prevented from growing up; the catalyst surface can be updated in time, and the catalyst activity can be kept; the device can be widely used in the large-scale process such as sewage treatment and chemical industry production.

The invention discloses a method for uniformly refining low-temperature lead-free glass powder by using an ultrahigh-pressure microjet technology and application thereof. Glass powder, deionized water and a dispersing agent are mixed according to the mass ratio of 1000: (500-1200): (5-30) for pre-dispersion, pre-dispersed slurry is emulsified and dispersed by using an ultrahigh-pressure microjet homogenizer, and then water-based low-temperature lead-free glass powder slurry is obtained. The side surface of a ZnO resistor disc is uniformly coated with the slurry by adopting spraying equipment, and sintering treatment is carried out to obtain a low-temperature lead-free insulating coating on the side surface of the resistor disc. The glass powder does not contain harmful substances such as lead and is environment-friendly. Grinding media such as ball-milling beads are not needed in the preparation process, the process is simple, the homogenization treatment time is short, and the dispersion efficiency is high. The particle size height is uniform and the particle size distribution is narrow. The obtained side insulating coating is compact and uniform, and has excellent high-current impact resistance.

The invention discloses a forge forming method for a 1Cr14Mn14Ni stainless steel ring part. The method comprises the steps that a stainless steel ingot is heated to the temperature of 1150-1180 DGE C, and a stainless steel blank in a forging state is obtained after cogging forge with three upsetting and three drawing and deflection larger than 70%; after the stainless steel is heated to the temperature of 750-770 DEG C and the temperature is kept for 30 min, the temperature is reduced to 660-690 DEG C and kept for 30 min, and thermal treatment is performed; then the stainless steel blank is heat to the temperature of 960-980 DEG C for forge forming; the stainless steel blank is quenched by using forge waste heat and then tempered, and heat treatment after forge is performed with a temper cooling manner combining rapid cooling and slow cooling. According to the method, a 1Cr14Mn14Ni stainless steel forge part can obtain an austenite structure with fine, uniform and high dislocation density, and accordingly, excellent mechanical property, corrosion resistance, cold workability and toughness are obtained. Therefore, the 1Cr14Mn14Ni stainless steel ring part can replace precious metal materials such as high-temperature alloy and titanium alloy to manufacture components such as a compressor casing with high strength and corrosion resistance.

The disclosed invention includes an apparatus for cutting biological tissue in a substantially uniform manner and method for using the same.

The invention discloses an alcohol production process which comprises the following steps: S1, introducing a water solution, methanol and nitrocotton which are proportioned into a first-stage reaction cavity, and standing at normal temperature to obtain a preliminary mixed alcohol solution, S2, filtering the preliminary mixed alcohol solution to obtain an impurity-filtered alcohol mixed solution and a gel substance, and introducing the impurity-filtered alcohol mixed solution into a second-stage reaction cavity; S3, carrying out multi-stage refining treatment on the gel and the impurity-filtered alcohol mixed solution to obtain a finished product alcohol solution, and S4, carrying out curing treatment on the finished product alcohol solution to obtain a solid finished product alcohol. According to the process, the gel is subjected to multi-stage refining processing, the gel can be quickly formed into particles in the actual stirring process, although the method has more treatment procedures for the gel, compared with the traditional method of directly stirring and scattering the gel, the treatment method has the advantages that the scattering efficiency of the gel is effectively improved, and the time consumption required by the actual stirring process of the gel is shortened.

The invention relates to a forging process of an extrusion roller of a cement roller press. The forging process is characterized by comprising the following steps that that a blank steel ingot is cast, wherein the steel ingot comprises the following chemical components of, by weight, greater than or equal to 0.35% and less than or equal to 0.45% of C, greater than or equal to 1.5% and less than orequal to 2.5% of Si, greater than or equal to 20% and less than or equal to 23% of Al, greater than or equal to 0.022% and less than or equal to 0.032% of Mg, greater than or equal to 0.2% and less than or equal to 0.38% of Mn, greater than or equal to 0.005% and less than or equal to 0.01% of Cr, greater than or equal to 0.5% and less than or equal to 1.5% of W, greater than or equal to 0.0055%and less than or equal to 0.0065% of Nb, greater than or equal to 0.5% and less than or equal to 1.5% of V, greater than or equal to 1.0% and less than or equal to 1.5% of Cu, greater than or equal to0.15% and less than or equal to 0.25% of Ti, greater than or equal to 0.25% and less than or equal to 0.35% of B, greater than or equal to 0.8% and less than or equal to 1% of Fe, greater than or equal to 0.5% and less than or equal to 0.9% of Mo, less than or equal to 0.1% of S and the balance Zn and inevitable impurities; then heating and upsetting are carried out twice correspondingly; then controlled cooling is carried out, wherein the cooling speed is 35 DEG C/h; and finally heat treatment after forging is carried out.

The invention discloses a variable-angle elliptical vibration-laser forming device for a CBN grinding head preparation. The variable-angle elliptical vibration-laser forming device for the CBN grinding head preparation comprises a variable-angle elliptical vibration device, a micro-grinding head substrate workbench, a vibration supporting platform, a laser cladding device and a mechanical arm, andis characterized in that the variable angle elliptical vibration device is arranged on the vibration supporting platform, the micro-grinding head substrate workbench is connected with the variable-angle elliptical vibration device through a double-head stud, the driving end of the mechanical arm is connected with an external driving device, and the free end of the mechanical arm is fixedly connected with the laser cladding device through bolts. The elliptical vibration of the micro-grinding head substrate workbench is realized by changing a single-direction vibration mode, so that the metal binding agent is more uniform in grain refinement in the laser forming process, air holes are reduced, and the service life of the CBN micro-grinding head is further prolonged; secondly, the included angle between two variable amplitude rods in the horizontal plane can be changed to achieve different elliptical vibration modes, so that the vibration included angle corresponding to the fine grain refining effect of the metal binding agent is obtained; different types of structural CBN micro-grinding heads can be obtained by changing laser cladding process parameters and scanning paths accordingto different requirements, so that the diversification of products is effectively increased, and the product can be better applied to different finish machining fields; and the device is small in structural control difficulty and easy to operate.