83 results about "Three roll mill" patented technology

The invention provides a manufacturing method of an X70QS seamless line pipe for an acid environment, comprising the following steps: 1. steelmaking, i.e. electrosmelting, external refining, carrying out VD or RH vacuum treatment, carrying out silicon-calcium wire treatment, and adopting a continuous-casting short-flow process combined with a clean steel smelting technology for controlling the content of P, S and inclusions; 2. tube rolling, i.e. adopting a hot-rolling seamless pipe process at the continuous rolling temperature of more than 950 DEG C, jointly controlling the dimensional precision of the tube by a PQF three-roll mill and a tension-reducing mill or a sizing mill; and 3. heat treatment, i.e. under the quenching temperature of 910-980 DEG C and the tempering temperature of 550-730 DEG C, carrying out high-temperature sizing and straightening control at the temperature of 480-630 DEG C to guarantee performance and size of the pipe. The manufacturing method has the advantages of accurate composition design, high dimensional control accuracy, low manufacturing cost and easy production; and the pipe obtained by the method has good mechanical property and good corrosion resistance, thus being applicable to a high-pressure gas delivery pipeline under an acid condition.

The present invention relates to a three-high rolling mill whose single drive input shaft reduction can be regulated. It includes machine frame, a main driving shaft and two driven shafts which respectively make an angle of 120deg. With said main driving shaft, bevel gears respectively mounted on said three groups of shafts, roll system formed from components of roll collar, etc. and screwdown device and screwdown setting mechanism. Said invention also provides the concrete structure of said main driving shaft and two driven shafts. Said invention can be used for rolling high-speed rod material, wire material and pipe material, its radial adjust size is 12mm.

Disclosed is a lubricating grease composition comprising a complex metal soap thickener of aliphatic dicarboxylic acid and monoamide monocarboxylic acid, and a fluororesin powder contained in a base oil mixture of a non-fluorine-based base oil and a fluorine-based base oil, which are incompatible with each other. The lubricating grease composition can be produced by kneading, preferably kneading by a three-roll mill, a non-fluorine-based grease and a fluorine-based grease, the non-fluorine-based grease being prepared by stirring a non-fluorine-based base oil, aliphatic dicarboxylic acid, and monoamide monocarboxylic acid under heating, and adding metal hydroxide thereto to form a complex metal soap in the non-fluorine-based base oil; and the fluorine-based grease being prepared from a fluorine-based base oil and a fluororesin powder.

The invention relates to quick-dry type silver paste used for a PCB through hole and a preparation method for the quick-dry type silver paste. The raw materials of the silver paste comprise the following components in parts by weight: 60-75 parts of metal silver powder, 5-10 parts of macromolecule resin, 0.5-3 parts of organic additives and 25-35 parts of organic solvent. The quick-dry type silver paste is prepared by the steps of weighing the macromolecule resin and the organic solvent and pouring the macromolecule resin and the organic solvent into a stirring vessel, stirring until the mixture is transparent; then carrying out filtering and impurity removing through a 300-400-mesh polyester net to obtain a carrier; weighing the metal silver powder, the carrier and the organic additives, and putting the weighed mixture in a high-speed dispersion machine to carry out high-speed dispersion to obtain uniform paste; grinding the paste by a three-roll mill; enabling the fineness of the silver paste to be less than 15[mu]m through adjustment of gaps of the rolling mill; enabling the viscosity of the silver paste to be within a range of 10-20Pa.S through fine tuning of the solvent; and filtering the paste by a 300-mesh stainless steel net to obtain the quick-dry type silver paste used for the PCB through hole. Compared with the prior art, the silver paste prepared by the method can be dried rapidly without being cured at a high temperature, and the production efficiency is high.

The invention discloses high-temperature and high-humidity resistant electrode silver paste for a ZnO piezoresistor. The conductive silver paste comprises the following components in percentage by weight: 52-80% of metal silver powder, 2-5% of glass powder, 10-30% of organic carrier, 1-3% of organic additives and 1-10% of organic solvent; the preparation method for the electrode silver paste comprises the steps of uniformly mixing the organic carrier and the organic solvent to prepare a uniform colloidal solution; then adding the other components in sequence; and enabling the mixture to be mixed through a mixer, grinded through a three-roll mill, and the like to obtain the high-temperature and high-humidity resistant electrode silver paste for the ZnO piezoresistor. Compared with the prior art, the electrode silver paste for the ZnO piezoresistor prepared by the invention is high in adhesive force, high in circulation volume, high in voltage resistance, low in ohmic contact resistance, high in flatness, excellent in structural compactness, and excellent in high-temperature and high-humidity resistance.

A three roll mill having a feed roll, a center roll, and an apron roll with that are driven so that their cylindrical surfaces move in the same direction but different speeds in each nip. One end of each roll is engaged by a drive shaft at a first side of the mill, whereas the other end of each roll rotates freely at a second side of the mill. Each roll can be removed individually and without tools by moving the roll away from the first side against a spring force in the second side. This disengages the roll from its drive shaft, whereupon it can be lifted out of the mill.

The invention relates to a three-roller spiral pore type rolling mill which comprises a roller device and a frame, wherein the roller device comprises three roller components which are mounted on the frame in the shape of a Chinese character 'pin'; each roller component is composed of a roller, a roller pressing adjusting mechanism, a roller axial adjusting mechanism and a roller feeding angle adjusting mechanism; the roller pressing adjusting mechanism, the roller axial adjusting mechanism and the roller feeding angle adjusting mechanism which are arranged on the roller device are used for realizing the pressing adjustment, axial adjustment and feeding angle adjustment of the roller; and the roller component is organically combined with a phase angle adjusting mechanism, thereby being suitable for the rolling of various parts. Besides, the three-roller spiral pore type rolling mill has the advantages that the whole design is reasonable and the manufacturing cost is low.

The present invention discloses nitrogen oxide sensor-used platinum-rhodium electrode paste and a preparation method thereof. The platinum-rhodium electrode paste is prepared from the following raw materials by mass percentage: 1-10 wt% of an inorganic binder,10-20 wt% of an organic binder, 10-50 wt% of ultrafine rhodium powder, 30-60 wt% of ultrafine platinum powder, and 5-10 wt% of zirconium dioxide. The preparation method comprises: (1) preparing the inorganic binder, (2) preparing the organic binder, (3) weighing the organic binder, the inorganic binder, the ultrafine rhodium powder, the ultrafine platinum powder and zirconium dioxide by taking the preparation of 100 g of platinum-rhodium electrode paste as a reference, adding to the container in accordance with the principle of from less to more, stirring sufficiently for uniform dispersion on adding each material, then grinding by a three-roll mill, removing agglomerated particles, and then stirring for dispersion to obtain the uniformly dispersed paste. The paste is good in printing, drying, and sintering performances and good in adhesion after sintering at high temperature.

The invention belongs to the technical field of forming and particularly relates to a compensation method of seamless steel pipe three-roll mill. The method comprises: 1, an equation of an elastic curve: T(x)=sigma ciphii; 2, a three-roll centering compensation method; 3, disturbance influence reduction method; and 4, elastic deformation compensation input adjustment method. The compensation method of the invention solves an elastic deformation problem of a seamless steel pipe three-roll mill and takes the characteristics and the influences of smooth adjustment into consideration. Simply, a smooth curve approximation mode of elastic deformation compensation can be used in three-roll mills and also can be used in production processes of other various mills, such as other hot rolling processes, cold rolling processes and the like.

The invention relates to a high-thermal-conductivity conductive adhesive prepared from nano-silver modified carbon nanotubes and a preparation method of the conductive adhesive and belongs to the technical field of composite preparation. The high-thermal-conductivity conductive adhesive prepared from nano-silver modified carbon nanotubes is prepared from raw materials as follows: 20-35 parts of aresin carrier, 65-80 parts of silver powder and 1-5 parts of the nano-silver modified carbon nanotubes. The carrier and the silver powder with the particle size of 5 mu m are fully dispersed and mixedby a three-roll mill, the nano-silver modified carbon nanotubes, the dispersant and the defoaming agent are added, mixed slurry is obtained and then mixed by a centrifuge, and the high-thermal-conductivity conductive adhesive is prepared. According to the method, the carbon nanotubes modified with nano-silver are added to silver adhesive, heat conducting bridge linking is formed among micro-silver particles, nano-silver on surfaces of the carbon nanotubes and silver particles are sintered and linked, a large number of heat conducting paths are established, the carrier transport potential barrier among filler is reduced, and the transport efficiency of phonons and electrons among filler interfaces is substantially improved.

A grease composition, which comprises a mixture of mutually incompatible thickener-containing non-fluorine-based base oil and thickener-containing fluorine-based base oil, the base oils being in a morphological structure, where one of the base oils is homogeneously dispersed in a particulate state in the other base oil, can be produced by kneading the mixture through a three-roll mill at least twice. By forming a morphological structure, one of the mutually incompatible non-fluorine-based base oil and fluorine-based base oil is homogeneously dispersed in a particulate state in the other base oil, that is, by forming a microscopically dispersed state, the following effects can be obtained (1) less oil separation (smaller degree of oil separation) at elevated temperatures, (2) distinguished shearing stability, (3) low and stable friction coefficient, and (4) less abrasion.

The invention discloses a production process device for a rebar with ribs at three sides. The device comprises a preprocessing procedure, a rough mill unit, first shearing equipment, a middle mill unit, second shearing equipment, a finishing mill unit, third shearing equipment, a diameter reducing and fixing unit, fourth shearing equipment and a postprocessing procedure which are arranged in sequence; the rough mill unit, the middle mill unit, the finishing mill unit and the diameter reducing and fixing unit all adopt a three-roll mill; crescent-shaped rib grooves matched with the shapes of rib parts at the surface of the rebar with the ribs at three surfaces are marked at the last three-roll mill of the finishing mill unit. The high strength three-roll mills are arranged in the full production line, the rolling capacity is large, large compression in one single path can be realized and guarantee is provided for producing a fine grain rebar; in addition, temperature control water tanks are arranged at multiple positions of the production line, so a rolled piece is subjected to online temperature control and cooling by mediums such as air and water, and the ordered production of the threaded rebar with high strength level can be realized by matching the reasonable temperature window of the rolled piece and the large compression process of the mills.

The invention relates to conductive silver paste for fine line silk-screen printing for a capacitive type touch screen. The conductive silver paste comprises the following components in parts by weight: 65-80 parts of metal silver powder, 5-10 parts of organic carrier, 3-20 parts of organic solvent, 0.1-1 parts of defoaming agent, 0.1-1 parts of leveling agent, 0.1-1 parts of anti-skinning agent, 0-1 parts of thixotropic agent and 0-1 parts of pigment; the preparation method for the conductive silver paste comprises the steps of mixing the organic carrier and the organic solvent to prepare a uniform colloidal solution; then adding the other components in sequence; and enabling the mixture to be mixed through a mixer, grinded through a three-roll mill, filtered, and the like to obtain the conductive silver paste for the capacitive type touch screen. Compared with the prior art, the conductive silver paste is simple in preparation process; the prepared conductive silver paste is low in volume resistance, high in adhesive force, high in surface hardness, corrosion resistance, and oxidization resistance, wherein the adhesive force between the conductive silver paste and a PET substrate can reach 5B level, and the surface hardness can reach greater than 3H; and in addition, the conductive silver paste also has an excellent ohmic contact performance.

The current invention relates to a method for the production of a magnetic layer on a substrate, comprising the production of a printable varnish, containing 60 weight-% of neodym iron boron powder, 10 weight-% of ferrite powder, preferably strontium hexaferrite powder, 1.4 weight-% of a catalyst, 1.1 weight-% of a dispersing additive, and as the remainder a matrix, preferably an epoxy polyol matrix. These agents are mixed by means of stirring or kneading, and rolled in a three-roll mill. Preferably, they are applied to a substrate by screen printing, and subsequently pre-cured at 80 to 120° C. for six to twelve hours, and then cured at 200° C. to 220° C. for three hours.

The invention discloses touch screen silver paste and a preparation method thereof. The touch screen silver paste is prepared from the following components in parts by weight: 40-60 parts of silver powder, 10-30 parts of zirconium hydride, 10-15 parts of polymer resin, 15-28 parts of an organic solvent and 2-5 parts of an additive. The preparation method comprises the following steps of firstly preparing an organic carrier; and adding the silver powder, the zirconium hydride and the additive to the organic carrier, fully mixing evenly, rolling by using a three-roll mill, filtering and removing insoluble substances. Through the addition of the zirconium hydride, the powder filling amount of the touch screen silver paste is not reduced while the usage amount of the silver powder is reduced by 15%-30%, the conductivity is ensured, the hardness and the scratch resistance are improved and the cost is reduced; and meanwhile, the touch screen silver paste is simple in preparation method and high in production efficiency. The touch screen silver paste does not contain a harmful heavy metal ion or halogen and meets the environmental protection requirements.

The invention relates to a heat treatment method for an aluminum alloy thick-wall ring part, in particular to a heat treatment method for a high-strength large-size aluminum alloy thick-wall ring part with controllable elongation and aims at solving the problem that a thick-wall ring part is low in alloy strength. The heat treatment method comprises the steps of cutting a 2A14 aluminum alloy thick-wall ring part, preserving the temperature at 490-500 DEG C, conducting quenching treatment and solid solution, and obtaining the aluminum alloy thick-wall ring part; 2, adopting a three-roll mill for conducting hot rolling on the aluminum alloy thick-wall ring part; 3, then conducting cold rolling treatment on the aluminum alloy thick-wall ring part obtained after the hot rolling; 4, conducting aging treatment for 2-5 hours at the temperature of 150-200 DEG C. According to the method, the formation of a theta'' phase is inhibited through a cold deformation method, the aging process is controlled so that the core portion of an aluminum alloy thick-wall ring can have high strength, the tensile strength of the aluminum alloy thick-wall ring part obtained after the heat treatment reaches 480 MPa, the yield strength reaches 460 MPa, and the elongation of the aluminum alloy thick-wall ring part is controllable within a certain range.

The invention relates to photovoltaic cell applied silver paste and a preparation method thereof. The silver paste comprises the following components: 50-70% of conductive phase, 10-25% of glass frit, 10-25% of organic carrier and 1-3% of additive. The above proportions are in mass percent, wherein the conductive phase is a mixture of silver powder and tri-silver citrate. The additive is a mixture of TiO2 or KAuCl4 with any one the following elements: microcrystalline cellulose, sodium alginate and mannitol. The method comprises: (1) adding the mixture of the ethyl alcohol absolute and the ethylene glycol to the conductive phase and the glass frit; (2) taking the organic carrier to mix with the organic solvent and grinding it with a three-roll mill; (3) preparing a silver film through the screen printing technology; and (4) placing the printed silver film in a muffle furnace and calcining it at a temperature from 700-800 degrees for three to five seconds. The silver paste of invention has a good printing performance and a low contact resistance with the silicon wafer. After the sintering of the silver paste, the electrode has a narrow width and a high thickness and can achieve good compactness, reducing the use amount of silver paste greatly. The overall cost is also low.

The invention discloses a low-silver back electrode slurry for chip resistors and a preparation method for low-silver back electrode slurry. The preparing method includes the steps of preliminarily mixing ultrafine silver powder, metal oxide, the glass powder modifier and partial organic carriers by a mixer; homogenizing the primary mixture by a three-roll mill until all the powders are well dispersed to form a slurry semi-finished product; secondarily mixing the slurry semi-finished product and the remaining organic carriers by the mixer; subjecting the paste to low-pressure rolling through athree-roll mill to be sufficiently dispersed, and then sieving through a 250-mesh sieve and carrying out vacuum defoaming to prepare a finished slurry. The back electrode slurry solves the problems of high resistance of a slurry sintered film and low adhesion to the alumina substrate under the condition of low silver content, and the production cost of a chip resistor product is reduced.

The invention relates to a steel pipe rolling process, which includes the following steps: heating, heating the tube blank in a heating furnace to above 1150°C; piercing, and piercing the heated tube blank through a piercing machine to make a capillary tube; Heating, sending the perforated capillary into an inclined-bottom heating furnace for short-term heating; rolling, putting the capillary after the second soaking on the stop mandrel, and then passing through a three-roll cross-rolling machine for shrinkage Diameter, wall reduction, extension and rolling to form a waste tube; stripping, the rolled waste tube is released from the restraining mandrel; sizing and shaping, sizing and shaping to form a hot finished tube; cooling, hot finished tube Cooling through the stepping cooling bed; the finished product is collected, which solves the production problem that the production of thin-walled seamless steel pipes cools quickly during the rolling process and is difficult to re-roll, and changes the production of thin-walled seamless steel pipes by cold drawing instead of hot rolling. Unreasonable product structure can reduce energy consumption, reduce equipment investment costs, and improve the efficiency of producing seamless steel pipes.