45results about How to "Small thickness tolerance" patented technology

The invention discloses a compact continuous casting and tandem rolling method for producing hot rolling strip steel, including the following steps: 1) liquid molten steel passes through a long nozzle from a ladle to be cast to a pouring box, flows through a submerged nozzle from the pouring box to be cast in a crystallizer of a continuous caster and is continuously cooled in the continuous caster to form a casting blank; 2) a shearing machine is used for cutting a flat blank into certain size; 3) the flat blank enters a tunnel roller hearth heating furnace for heating; 4) the continuous caster is provided with a plurality of casting flows, one of which is in collineation with a rolling mill, the casting blank of other flows passes through a swinging section and is converged with the casting blank of the collinear flow and then is descaled by high pressure water; 5) the casting blank carries out rough rolling into an intermediate blank by a roughing mill group; 6) the intermediate blank is coiled and decoiled by a hot coiling box; 7) the head and the tail of the decoiled intermediate blank are cut and descaling by high pressure water is carried out to the decoiled intermediate blank; 8) the intermediate blank carries out finish rolling into a steel strip with standard thickness; 9) the steel strip is coiled into a finished steel coil by laminar flow cooling. The method is characterized by stable production technique, shorter production line, low equipment investment and high utilization rate of energy in the whole production process, etc.

The invention relates to super-thick EH36 steel for an offshore wind power pipe pile. The super-thick EH36 steel for the offshore wind power pipe pile comprises the following chemical components in percentage by mass: .015 to 0.18 percent of C, 0.15 to 0.30 percent of Si, 1.40 to 1.60 percent of Mn, less than or equal to 0.0070 percent of P, less than or equal to 0.0030 percent of S, 0.050 to 0.070 percent of Nb, 0.015 to 0.030 percent of V, 0.08 to 0.020 percent of Ti, 0.030 to 0.050 percent of Al, 0.15 to 0.40 percent of Ni, 0.10 to 0.20 percent of Cr, and the balance of Fe. A production process flow comprises the following steps: performing converter operation, performing LF refining, performing vacuum degasifying, performing Ca treatment, performing continuous casting, dehydrogenizing, rolling, performing air cooling, performing high-temperature hot straightening, and normalizing. According to the production process flow, the super-thick EH36 steel of 90 to 120 mm for the offshore wind power pipe pile, which is high in unit weight, high in strength, high in impact toughness, small in thickness tolerance and high in straightness and does not have a surface defect is obtained.

The invention discloses a continuous casting and tandem rolling method for producing hot rolling strip steel by using medium sheet billet, including the following steps: 1) liquid molten steel passes through a long nozzle from a ladle to be cast to a pouring box, flows through a submerged nozzle from the pouring box to be cast in a crystallizer of a continuous caster and is continuously cooled in the continuous caster to form a casting blank; 2) the casting blank enters a short tunnel roller hearth type heating furnace for heating; 3) a technology of converging a plurality of casting flows is adopted, one of the casting flows is in collineation with a rolling mill, the casting blank of other flows passes through a swinging section and is converged with the casting blank of the collinear flow, then passes through a walking beam and a holding zone of the roller hearth complex type heating furnace which is provided with a roller way and finally enters high pressure water for descaling; 4) the casting blank is prepared into an intermediate blank by rough rolling; 6) the intermediate blank carries out finish rolling into a steel strip with standard thickness; 7) the steel strip is cooled and coiled into the finished steel coil. The method can reduce investment, save energy resource, improve the quality of products, expand the varieties of the products and lower production cost.

The invention relates to the technical field of artificial plate manufacturing, in particular to an ultra-strength shaving board manufacturing technology changing morphological structure of wood shavings. The ultra-strength shaving board manufacturing technology comprises the processes of wood chipping, flaking, drying, sieving, glue applying, paving and pre-pressing, hot-pressing, board reversingand cooling, sanding and saw cutting, testing and classifying, warehousing and packaging and the like. The quality performance of an ultra-strength shaving board produced and manufactured by the ultra-strength shaving board manufacturing technology is far better than the standards of an European oriented strand board in 'EN300: 2006-OSB' and 'T/CTWPDA03-2017 veneer shaving board', and the strength of the ultra-strength shaving board even reaches the strength level of a hipboard or plywood; the ultra-strength shaving board has the outstanding features of highest mechanical strength compared with a plate with the same density, lowest density compared with a plate with the same strength, and material saving, and the mechanical strength performance of the ultra-strength shaving board is improved greatly due to the fact that the product structure is uniform and compact; and the advantages of a stable size, non-deformation, small thickness tolerance and the like are realized, and the transformation and upgrading of the artificial board industry, especially shaving board industry are facilitated greatly.

The invention discloses a preparation technology of a PET/PETG shrink film, comprising: 1. drying treatment: drying copolyester slices at the temperature of 65-75 DEG C; 2. melt extrusion: mixing the dried copolyester with functional master batch/ functional accessory ingredient, and adding into a single screw extruder to carry out melt extrusion; 3. die head/ casting strip quenching: after a melt extruded fusant enters a hanger-type die head by a fusant metering pump, a filter and a fusant pipeline, casting to a cooler drum via a die lip mouth to form the casting strip; 4. unilateral stretching: stretching the casting strip processed in the last step; and 5. rolling and slitting: measuring the thickness of the unilateral stretched film on line, dragging, and rolling; and finally, slitting, checking and packaging to obtain the film product. The product produced by the method has high transparency, good mechanical behavior, high output, high cooling speed and high production efficiency, and the tolerance of the thickness thereof is smaller than that of a blown film.

The invention provides a plastic floor and a preparation method thereof. The plastic floor comprises a silencing layer, a stone-plastic substrate layer, a color film layer and a wear-resistant layer from bottom to top. The stone-plastic substrate layer is prepared from the following raw materials by weight: 50-65 parts of polyvinyl chloride, 100-120 parts of calcium carbonate, 6-9 parts of a calcium-zinc compound stabilizer, 0.7-0.8 part of stearic acid, 0.5-0.8 part of polyethylene wax, 3-5 parts of an acrylic polymer and 3-5 parts of chlorinated polyethylene. The stone-plastic substrate layer, the color film layer and the wear-resistant layer are subjected to hot-press molding together, and the stone-plastic substrate layer and the silencing layer are bonded by a hot-melt adhesive. The plastic floor of the invention adopts the stone-plastic substrate layer which does not include a plasticizer, so the stability of the plastic floor can be effectively improved and the thickness of theplastic floor can be more accurately controlled; and thus, a thin plastic floor can be more easily prepared. In addition, the silencing layer is arranged and has silencing effect, and good foot feeling can be obtained through reduction in the thickness of the plastic floor.

The invention provides a method for preparing a titanium plate billet. The method comprises the steps of pressing titanium sponge into an electrode block, or evenly mixing the titanium sponge with an intermediate alloy and/or a metal as an alloy element and then pressing for the formation of the electrode block, welding the pressed electrode block into a cylindrical electrode and smelting the cylindrical electrode by adopting vacuum consumable electro-arc for the formation of a cylindrical cast ingot; peeling the obtained cylindrical cast ingot, then performing 90-180min heat preservation at a temperature of 800 to 850 DEG C, increasing the temperature to 950 to 1050 DEG C for 180-420min heat preservation and forging the cast ingot into a rectangular intermediate billet after the forging and drawing of one heating number; and finally performing hot-rolling and cogging on the obtained intermediate billet for the formation of the titanium plate billet. With the adoption of the method for preparing the titanium plate billet, the operation is convenient and the obtained titanium plate billet is small in thickness tolerance and good in surface quality.

The invention discloses a technology for forming maintenance-free lead-acid battery pole plates, comprising the following steps: (1) heating to melt an alloy lead liquid in a melting furnace; (2) casting the alloy lead liquid into lead strips by using a casting machine; (3) winding the lead strips by using a winder; (4) delivering the lead strips to a stamping machine and stamping the lead strips into plate grid strips (1), wherein uniform rectangular holes (2) are formed in the middle of each plate grid strip (1), ribs (3) are arranged among the holes (2), and edge and corner lead strips (4) used for cutting plugs are arranged on two sides of each plate grid strip; (5) winding the plate grid strips by using the winder; and (6) coating the plate grid strips by using a plate coating machine and splitting the plate grid strips by using a plate splitting mold to form lead-acid battery pole plates. The technology for forming maintenance-free lead-acid battery pole plates during lead-acid battery production can improve the service life, the quality and the specific energy of a lead-acid battery.

The invention discloses a preparing system of PMMA light-guide-stage transparent membranes. The preparing system comprises a washing device, a drying device, an extruding device, a polishing device, aconveying device, a relay type membrane surface dust removal device, a film pasting device, a first cutting device, a traction device, an edge cutting device, a second cutting device and a piece loading device which are sequentially arranged and further comprises negative-pressure chip sucking devices arranged on the discharging sides of the first cutting device, the edge cutting device and the second cutting device correspondingly. Squeezing rollers below a mouth die of the extruding device are a pair of flexible rollers. The relay type membrane surface dust removal device comprises an upperdust removal roller set and a lower dust removal roller set which are arranged on the two faces of the membranes. The negative-pressure chip sucking devices each comprise a plurality of negative-pressure chip sucking parts arranged on one face or two faces of a to-be-cut product. Ultra-thin and ultra-wide PMMA membranes can be produced, inner stress of prepared products is evenly distributed, andthus the products are not prone to being cracked. Meanwhile, the very small thickness tolerance (smaller than 1.5%) and extremely perfect optical quality can be obtained, and the defect that powderedscraps press the appearances of the products to be damaged is effectively overcome.

The invention discloses a PCB back-drilling cover plate and a preparation method thereof. The cover plate is a single-sided aluminum-laminated foil phenolic aldehyde cover plate formed by compoundingphenolic resin, an aluminum foil adhesive, paper and alloy aluminum foil. An insulating medium layer formed by the phenolic resin, the aluminum foil adhesive and the paper is utilized for replacing ahigh-cost epoxy resin glass fiber composite insulating medium layer, and the prepared cover plate has the effects that the drilling is easy, the positioning effect is good, the abrasion of a drillingneedle is reduced; and the alloy aluminum foil is utilized for replacing a high-cost aluminum foil, so that the cost is substantially lowered, and the prepared cover plate has the characteristics thata metal conductive layer is thin, the thickness tolerance is small, the adhesion with a PCB is good, and the control depth precision of a drill hole is high. According to the PCB back-drilling coverplate, the problems of an aluminum piece that the positioning effect and the drilling precision are poor, adhesion with the PCB is poor and the control depth precision of a drill hole is poor are solved, and the problem that a single-sided copper-laminated plate is high in cost is solved, and the appearance problems of appearance corrugation and water stain in the production of single-sided aluminum-laminated foils similar to the single-sided aluminum-laminated foil phenolic aldehyde cover plate as well as and scratching in a baking process are solved.

The invention discloses a cold rolling process of a precise stainless steel band for a steel structure building. The cold rolling process comprises the following steps: primary rolling for 8 times; cleaning by degreasing; primary annealing; secondary rolling for 6 times; secondary annealing; and stretch bend straightening, leveling, tailoring, packing and storing. The precise stainless steel band which is 0.1-0.25 mm thick is obtained according to the cold rolling process: primarily rolling, degreasing, primary annealing, secondary rolling, secondary annealing and straightening. The precise stainless steel band for the steel structure building has the advantages of being high in strength, light in self weight, stable in extension property, small in thickness tolerance, and low in possibility in generating cracks in punching.

The invention relates to a surface treatment process for a cooling water pipe joint assembly. The surface treatment process comprises the steps that a base material is pretreated; a protective layer is formed on the base material and is a zinc layer, and the thickness of the protective layer is 10-15 micrometers; a passive film layer is formed on the protective layer; a closed film layer is formed on the passive film layer. After the surface of the cooling water pipe joint assembly is treated, the cooling water pipe joint assembly is more attractive, better in medium resistance, oxidation resistance, corrosion resistance and other performance, and longer in service life.

The invention discloses bamboo plywood for a structure. The bamboo plywood for the structure comprises a core board layer and hot-pressed layers arranged on the two sides of the core board layer. The core board layer is made of battens through lateral cold pressing and gluing and sanding thickness determining, wherein the battens are formed by cutting bamboo plywood GluBam which is used in a structure and has the thickness of 25 mm to 30 mm. The pressed forming surfaces of all the battens in the formed core board layer are perpendicular to pressed forming surfaces of the hot-pressed layers. According to the bamboo plywood for the structure, nails can be driven into two sides of the bamboo plywood, the thickness in each bamboo plywood layer is even, and the thickness tolerance between the plywood layers is small; in addition, the hot-pressing technology efficiency is high, and the mechanical property is high. The bamboo plywood for the structure can completely overcome the inherent defects of the existing plywood GluBam and is used for production and construction of the bamboo structure.

The invention discloses a preparation method of ultrathin adiabatic and insulated flexible non-woven fabrics resistant to 1000 degrees. The method comprises the following steps of S1) melting and purifying nonmetallic crystal mineral, and adding rare metal compounds to prepare high-temperature resistant fiber; S2) opening to card the high-temperature resistance fiber into thin webs with uniform thickness; S3) applying solvent resistance stock glue solution on the thin webs for drying and dehydration to prepare solvent resistance high-temperature resistant porous cotton, and preparing high-temperature resistance fiber non-woven rolls; S4) uniformly dispersing adiabatic powder in a 100% alcohols solvent to form a mixed solution, and soaking the high-temperature resistance fiber non-woven rolls in the mixed solution in a vacuum mixing kettle for reverse reduction reaction; and S5) recovering the residual alcohols solvent after reaction by using low-temperature vacuum centrifugation to prepare the finished non-woven fabrics. The non-woven fabrics prepared by the invention are ultrathin, ultra-light, resistant to 1000 degrees, adiabatic and resistant to alcohols solvents with 100% concentration, have excellent dry and wet strength, and are capable of maintaining complete structure, electrical insulation and explosion protection.

The present invention relates to a single-roller type cutting tool for processing bamboo material. It comprises a roller body equipped with a roller shaft, on the described roller body one or more than one cutting blades are mounted so as to form the moving cutting blades which can be rotated around the axis of said roller body. Besides, it also has static fixed cutting blades which are correspondent to those moving cutter blades, so that said moving cutting blades and static fixed cutting blades are formed into said invented cutting tool with high cutting efficiency and low production cost.

A sanding shoe (1, 1.1) for a belt grinding machine, consisting of a carrier (2), an intermediate material (3) and a sanding belt activator (4), wherein the carrier consists of a flexible material.

The invention discloses a turning tool for machining an ultrathin broad-width polytetrafluoroethylene thin film. The turning tool comprises a pressing knife, a blade and a lower knife body, wherein the blade is fixed on the lower knife body in a detachably movable connection manner; knife slots for mounting and fixing the blade are formed in the lower knife body; locking bolts are arranged on oneside of the knife slots of the lower knife body; and the blade is fixed on the lower knife body through the locking bolts. The pressing knife and the lower knife body are respectively connected and fixed with a lathe through fixing bolts; bolt slots convenient for adjusting fixed positions are respectively formed in the pressing knife and the lower knife body; and the blade is made of hard alloy.According to the turning tool for machining the ultrathin broad-width polytetrafluoroethylene thin film, the blade is fixedly clamped between an upper knife body and the lower knife body through bolts, so that reliable fixing of the blade can be realized, and the problem on welding of a conventional knife body and the blade is solved. The service life of the turning tool can be effectively guaranteed; and furthermore, the tool cost is reduced, and the production efficiency is improved.

The invention relates to a surface treatment process for an eye joint of a brake pipe. The surface treatment process comprises the steps that a base material is subjected to pretreatment; a protecting layer is formed on the base material; the protecting layer is a zinc layer, and the thickness of the zinc layer is 6-15 micrometers; a passive film layer is formed on the protecting layer; a sealing film layer is formed on the passive film layer. According to the surface treatment process, after the surface treatment is conducted on the eye joint of the brake pipe, the eye joint of the brake pipe is more attractive, the performance such as medium resistance, oxidation resistance and corrosion resistance is better, and the service life is longer.