206results about How to "High dimensional accuracy" patented technology

The invention relates to a forming technology of superfine thin walled tubular products for vessel stents in the field of treatment, specifically to a method of processing cobalt-base alloy superfine thin walled tubes for novel coronary artery stents. The method solves the problems of great difficulty in tubular product processing and low yield of tubular products in a conventional technology. The method for forming finished products comprises the successive technological processes of smelting, forging, hot rolling, hot rolling punching, honing and cleaning of inner surfaces and outer surfaces, annealing, cold rolling/drawing, annealing, and repeated cold rolling/drawing. During overall process of the repeated cold rolling, diameter reducing deformation of the tubular products should be controlled in each pass, and match relationship between the diameter reducing deformation and wall reducing deformation should be well adjusted for guaranteeing that load carrying capability of inner walls does not exceed sigma b (breaking strength) and thus for preventing horizontal microscopic breakage. With rough blanks of the tubular products being acquired in high temperature conditions and the cobalt-base alloy tubular products being acquired through rolling at a room temperature, the processing method guarantees high dimensional precision, bright and clean inner and outer surfaces and excellent mechanical property of the tubular products; and is easy to realize and has high controllability and high economic benefit.

The invention provides a manufacturing method of a nuclear nickel-base high-temperature alloy GH 4145 wire and belongs to the technical field of high-temperature alloy wire machining. The method includes the steps that after being blended according to the mass percent, raw materials are subjected to vacuum induction and vacuum consumption duplex smelting and cast into an alloy ingot; the alloy ingot is homogenized so as to be forged into an alloy ingot blank, and the alloy ingot blank is then subjected to flaw detection and finishing and hot-rolled into a wire rod with the diameter phi ranging from 8 mm to 12 mm; the wire rod is subjected to solution treatment and is rounded, peeled and coated with a film; drawing and annealing are performed sequentially, the wire rod is pulled into the alloy wire with the required diameter, and the GH 4145 alloy wire is obtained. By the adoption of the nuclear nickel-base high-temperature alloy wire, the whole process is free of acid pickling, the special nuclear requirement is met, and meanwhile the finished wire is high in size accuracy, good in surface quality, even in component and structure and excellent in mechanical performance and processing performance. The method can be widely applied to the machining field of the nuclear nickel-base high-temperature alloy wire.

The invention discloses a laser composite manufacturing technology of parts. The laser composite manufacturing technology comprises the following steps: S1, loading a model; S2, preprocessing the model; S3, slicing; S4, performing a material additive manufacturing technology; S5, judging whether surface roughness meets the requirement or not; S6, carrying out laser remelting and laser polishing; S7, judging whether dimensional accuracy meets the requirement or not; S8, carrying out laser ablation and laser engraving; S9, judging whether surface quality meets the requirement or not; S10, carrying out laser quenching and laser oxidation; S11, judging whether the manufacture of the model is finished. The laser composite manufacturing technology integrates the laser material additive manufacturing technology, a laser material subtractive manufacturing technology and a laser surface modification technology, thus being capable of effectively improving the dimensional accuracy, surface smoothness and compactness of the parts, improving the surface quality of the parts, and realizing one-time molding of the parts.

This invention teaches an improved method and apparatus to make metal alloy castings, such as railroad car connector knuckles. One embodiment of the invention comprises a plurality of core mold assembly units contained within a single molding flask, wherein the mold units are filled with molten metal by way of a common runner and riser system. The said core mold assembly elements may be further comprised of a mold and core assembly formed of the same material, such as phenolic urethane impregnated sand, which is used to accurately replicate the desired shape of a final desired product. This invention eliminates the need to carefully gauge a plurality of part patterns within a single mold flask and reduces the potential for loss of parts, for example by cold shunting, by segregating each part to its own mold isolated mold unit. Such a method and apparatus allows a plurality of parts to be cast in a more accurate way, producing less scrap, improving part dimensional stability, and in some cases, reducing the number of cores needed.

The invention relates to a production method of an ultrathin stainless steel band, which comprises the following steps of: selecting a stainless steel band blank; carrying out primary rolling process, annealing, secondary rolling process, annealing, third rolling process, degreasing and annealing by adopting a twenty-roller reversible precise roll train so that the stainless steel band with thickness of 3mm as the raw material is rolled into a stripe stainless steel band as a semi-finished product with thickness of 0.1mm, wherein the thickness tolerance of the stainless steel band as the semi-finished product is +/-0.005mm; smoothing and re-coiling, and shearing the stripe stainless steel band as the semi-finished product to reach the width specification required by a user; and finally, checking and packaging and storing. The production method has the advantages of compact procedure, high rolling precision and high yield of the ultrathin stainless steel band, high band thickness precision, straightness and rolling speed of the cold-rolled steel band and high deep drawability and strength of the steel band.

The present invention provides a technology for forming the trenches having different depths in one semiconductor substrate, which enables easily conducting the photo resist process employed for the etch process and forming trenches at higher depth dimension accuracy. The openings of the first films are formed in the semiconductor substrate to expose surfaces of the semiconductor substrate, the semiconductor substrate is etched through the openings to a depth of the shallower trench and then the cell region is covered with the second photo resist pattern, and the peripheral region is etched through the first films to form the deeper trench. Since the etch process is conducted under the conditions, in which the surfaces of the semiconductor substrate are exposed (opened) within the openings in the first film, trenches having different depths can be formed with higher depth dimension accuracy by suitably controlling the etch conditions.

The invention discloses a splicing type communication rack, which comprises a frame and a exterior cover member; the frame is mainly composed of section bar made columns and crossbeam by jointing them by fastening and connecting members; the exterior cover member comprises a top-cap, a base plate, a base seat, a door plate and a side plate; the base plate is fixed on the back of the frame bottom by fastening and connecting members; the framework bottom is fixed on the base seat by fastening and connecting members; the top-cap is fixed on the top of the frame bottom by fastening and connecting members; the top-cover and base plate covers the top surface and the bottom surface of the frame; the side plate is embedded on the frame by fastening and connecting members; one side of the door plate is hinged on the frame, the other side is equipped with door lock for locking the machine cabinet; and the door plate and the side plate cover the sides of the frame. The invention adopts section bar jointed frame structure and jointed integral body structure, which has higher dimension precision than the current steel plate welded structure, and achieves the advantages of small stress deformation, easy processing, convenient assembling and high production efficiency.

The invention discloses a preparation method for a ceramic mobile-phone rear cover. The preparation method comprises the following steps: (1) preparing yttria-stabilized zirconia powder or alumina powder into a suspension with a solvent; (2) taking doped and modified yttria-stabilized zirconia powder or doped and modified alumina powder in a mold, carrying out dry-pressing molding, after completion of molding, carrying out placing into a cold isostatic press, and carrying out isostatic pressing so as to obtain a ceramic green body; (3) directly placing the ceramic green body into a sintering furnace, and carrying out sintering at a low temperature under normal pressure so as to obtain a ceramic pre-sintered body; (4) placing the ceramic pre-sintered body into a hot isostatic pressing sintering furnace, and carrying out secondary sintering so as to obtain a compact ceramic body; and (5) subjecting the ceramic body to CNC shape processing, rough grinding, fine grinding and polishing so as to obtain the ceramic mobile-phone rear cover. Correspondingly, the invention also discloses the ceramic mobile-phone rear cover prepared by adopting the above-mentioned method. By adopting the method provided by the invention, the ceramic mobile-phone rear cover has high strength, high toughness and high size precision.

The invention relates to an injection-molded reactive sintered SiC ceramic material and a preparation method thereof. The ceramic material is prepared from the following raw materials in percentage by mass: 55-80% of silicon carbide, 3-10% of carbon powder, 1-3% of a surfactant, 6-20% of a lubricant and 6-20% of a binder through the steps of mixing, molding, degreasing and sintering, wherein the sum of the amount of components is 100%. The reactive sintered SiC ceramic molded by using the method provided by the invention has the advantages of uniform density of a billet and high dimensional precision, and can be used for manufacturing high-quality ceramic parts with complex structures and no defects. As for the prepared reactive sintered SiC ceramic material, the bulk density is more than 2.7g/cm<3>, and the three-point bending strength can be above 260MPa.

Provided is a process for producing expanded polyolefin resin particles whose cells are not made nonuniform or extremely smaller as seen in conventional expanded particles, whose cell diameter and expansion ratio can be easily controlled independently, and which, when subjected to in-mold expansion molding, give in-mold expanded molded products satisfactory in fusibility and excellent in surface properties. The process is a process for producing expanded polyolefin resin particles by: dispersing polyolefin resin particles together with an aqueous dispersion medium into a closed vessel; heating the polyolefin resin particles up to or above a softening temperature of the polyolefin resin particles; and releasing the polyolefin resin particles into a zone whose pressure is lower than an internal pressure of the closed vessel, with use as a foaming agent of water serving as the dispersion medium, the polyolefin resin particles being composed of a polyolefin resin composition including: polyolefin resin; a substance selected from among polyethylene glycol, polyvalent alcohol having a carbon number of not less than 3 to not more than 6, and a water-absorbing substance having no function of forming foaming nuclei; and a foam nucleating agent.

The invention relates to a special-shaped steel wire production method, which is a continuous overall die-drawing production method for special-shaped steel wires. It uses a rotating mold box to position the special-shaped mold to ensure that the special-shaped mold has the same outlet mode, and passes the special-shaped surface of the steel wire between the upper and lower passes. Adjust the direction of the mold by itself to ensure the accuracy of the shape and size of the steel wire to meet the changes in the size and compression rate of the steel wire during the production process. The gripper of the subsequent reel is polished to ensure that the size of the subsequent special-shaped surface of the steel wire is getting smaller and smaller. The performance and size of the steel wire can meet the plastic deformation required by the gripper. The method improves product quality, reduces production procedures, shortens production cycle, improves production efficiency and reduces production cost.

The invention provides a television mullion structure, which comprises a body and a connecting piece, wherein the body is a rectangular frame and is formed by bending a hollow sectional material, the seam points at both ends after the sectional material is bended are connected through the connecting piece, the seam points are positioned in the middle position of a lower frame of the rectangular frame, and the bending point of the body is fixed by corner piece bolts. The structure is formed by bending the aluminum sectional material for four times, and only one seam exists, so the whole television has attractive appearance and high size precision, high strength can be achieved under a very narrow size, and simultaneously, the modeling of fillets can be realized. In the invention, one piece of sectional material is bended to avoid four corner splicing seams and splicing offset, so that the assembly precision is high, the process control is simple, and simultaneously, the mould of the aluminum material has a simple structure, a short manufacturing cycle and smaller prior-period investment.

A method of drying a ceramic formed body comprising the step of performing dielectric drying on an unfired honeycomb formed body formed with a ceramic material as a main raw material under a condition that a power density is 5 to 20 [kW/kg (water)].

A method for casting the shaped workpiece includes preparing model, preparing female mould, preparing male mould, preparing alloyor wax mould, pressure casting, heating while demoulding, and recovering alloy or wax. The process for preparing said alloy or wax mould is also disclosed.

The invention discloses a machining method for a titanium mobile phone shell or a titanium alloy mobile phone shell. The machining method comprises the following steps of (1) board blanking, (2) heating, (3) forging and performing, (4) welding, (5) heating, (6) first-time forging, (7) CNC excess material milling, (8) sand blasting for oxidation layer removing, (9) heating, (10) secondary finish forging, (11) edge cutting and burr removing, (12) sand blasting for oxidation layer removing, (13) stress relief annealing under vacuum and (14) CNC finish machining. According to the machining method for the titanium mobile phone shell or the titanium alloy mobile phone shell, raw material input can be saved, the technology is simple, the production efficiency is improved, and the production cost is reduced.

Provided is a process for producing a glass-like carbon deformed molded article having a deformed section (typically, an elliptical section or a section composed of partial circles and linear portions), such as a glass-like carbon member in a deformed pipe form or a bent pipe, with relative ease and a good dimensional accuracy. The process comprises the step of molding a thermosetting resin to yield a thermosetting resin molded article, the step of deforming the thermosetting resin molded article plastically in the state that the article is heated, so as to yield a thermosetting resin deformed article, and the step of carbonizing the resultant thermosetting resin deformed article.

The invention discloses a casting technology of an engine cylinder cover and a core assembling structure, and relates to a casting technology. A sand mold is manufactured through the cold core box core manufacturing technology, an intra-cavity inner sand core is manufactured through the precoated sand hot core box core manufacturing technology, vertical casting is carried out after the appearance is locked through sand core discharging, and a good solution is provided for cylinder cover air holes, sand holes, leakage, inner cavities and surface smoothness. By means of implementation of the technology, the casting yield is increased to be more than 98%.

A method for producing a rare-earth alloy based binderless magnet according to the present invention includes the steps of: (A) providing a rapidly solidified rare-earth alloy magnetic powder; and (B) compressing and compacting the rapidly solidified rare-earth alloy magnetic powder by a cold process without using a resin binder, thereby obtaining a compressed compact, 70 vol % to 95 vol % of which is the rapidly solidified rare-earth alloy magnetic powder.

A magnetic head has an opposite face opposite to a magnetic disk, a main pole having a distal end face and an inclined face exposed to the opposite face, and a shield yoke extended substantially facing the opposite face. An end face on which the shield yoke is opposite to the main pole via a gap is inclined substantially in parallel to the inclined face of the main pole.

The invention relates to a milling tool that is formed for the hobbing of a workpiece having cogs, such as cogwheels, racks and the like, and comprises a cylindrical tool body that defines a rotation axis and comprises a plurality of disc-shaped segments. Each one of the segments includes a hub part having two opposite plane-parallel end surfaces, which extend perpendicular to the rotation axis, and a peripheral cam having a plurality of tangentially spaced-apart milling inserts. Bordering segments are detachably interconnected by means of one each of male and female members co-operating in pairs. The male and female members are situated so that the rotation axis extends through the male and female members. The male and female members include each a contact surface, which converges from a big end toward a small end and which, in a cross-section across the rotation axis, forms an out-of-round curve. The contact surfaces of the male and female members are dimensioned so that they, when the male and female members are being brought together, direct their two bordering segments toward an end position that is centred and mutually angularly determined by the out-of-round cross-section curve around the rotation axis and where the plane-parallel end surfaces abut against each other. In addition, the invention relates to an individual segment as such.

The invention relates to a new method for manufacturing a composite coating shell for precisely casting fusible patterns, and belongs to the field of precise casting. The method comprises the following steps: using water-based ethylsilicate-silica sol as a mixed binder, preparing mixed binder paint by mixing the mixed binder with refractory powders and a curing agent, painting the mixed binder paint on the surface of a fusible pattern to form a monolayer or multilayer coating bottom layer, and sequentially painting a monolayer water glass binder paint transition coating and a multilayer waterglass binder paint enhanced coating on the bottom layer, thereby forming the composite coating shell for precisely casting the fusible pattern, wherein the composite coating shell consists of a mixedbinder coating bottom layer and a water glass binder coating enhanced skin coat. The invention solves the manufacturing difficult points of the shells with complicated inner cavities, deep blind holesand deep groove parts and the problems of slow drying, long production periods, low quality and the like of the shells existing in a precise casting trade for a long time, comprehensively improves the quality of precision castings, markedly reduces the production cost, is favorable for environment protection and is a creative breakthrough for a traditional technique in the field.

The invention relates to the technical field of additive-subtractive manufacturing, in particular to coaxial powder feeding and laser forging compound additive-subtractive manufacturing method and device. On the basis of a component three-dimensional model, after slices are cut and a path is planned, a fusion covering robot is started to adopt continuous laser for layered forming a component, meanwhile, a forging robot is started to adopt short pulse for laser forging a fusion covering area within a forging temperature range, meanwhile, a milling system is started for milling the fusion covering area, and a two-beam laser system and the milling system are intercoupled-influenced through real-time feedback data, so that the accuracy of the obtained component is high, and the inner part of the component has hardly any defect. Through coaxial powder feeding by the robot, the problem of the fusion covering stability caused by the environment, the powder shape and the uniformity of a powderfeeding process is solved; through laser shock forging, the problems of air pores and microcracks of the fusion covering area are solved, and the residual stress distribution state is improved; and through milling each layer of the fusion covering area, the dimensional accuracy of the component is improved, and the surface roughness is reduced.

The invention discloses a bearing ring turning and cutting feed method, which belongs to the technology of turning processing. According to the existing cutting feed control method, a cutter is easy to break, materials are easy to block, and the deviation from circular form is large, while the bearing ring turning and cutting feed method is characterized in that a complete cutting feed process is divided into at least two sections of processes, and primary retracting is carried out so as to break cuttings after each process is finished. Particularly, a digitizing controller is used for controlling a servo motor to drive a carriage to realize cutting feed and retracting; a pneumatic actuating element is adopted for realizing feeding, blanking, clamping of a workpiece, fast moving of the carriage. According to the bearing ring turning and cutting feed method, through at least two times of cutting feed and retracting to break the cuttings, the problem of curling of the cuttings is solved; inner stress generated by power cutting is released, so that deformation of the workpiece caused by the inner stress is reduced; and due to the adoption of digitization programmed control technology, a segmented feeding mode in a bearing ring turning processing process is realized, the inner stress caused by large cutting volume is eliminated, and the dimensional accuracy and the shape precision of bearing ring turning processing are improved.

The present invention relates to an on-line core making technology. The technology comprises steps of: carrying out sand shooting and curing at a core making position in an upper die and a lower die to form a sand core; removing the sand core from the lower die, leaving the sand core in the upper die and removing the lower die from the core making position; moving a pallet into the core making position, removing the sand core from the upper die and putting the sand core on the pallet; and moving the pallet out of the core making position. An on-line core making device comprises a frame, an upper die, a lower die and a sand shooting air blowing component. The lower die is movably arranged on the frame, and the frame can be movably provided with a plurality of pallets; during core making, the lower die is below the upper die; and during core connection, the pallet is located under the lower die. The invention solves a problem of moving a molded sand core from a core box to the pallet and ensures size precision of the molded sand core and the stability of the sand core, so as to improve size precision, performance and quality of the final casting, simplify system configuration, cancel a handling process from the core box to the pallet achieved by a robot and a spreader or an artificial sling and improve the reliability of the system.

The invention provides a method for preparing a metal core for investment casting and a precision investment casting method for an aluminum alloy casting based on the metal core. The method comprises the following steps that: the metal core is designed; a nickel-based or iron-based high temperature alloy is processed into the designed metal core by a slow-feeding wire-cut method, and the surface of the metal core is ground and polished; the ground and polished metal core is fixed in a mould and then is cast to form an investment pattern; the investment pattern is coated, dewaxed, roasted and subjected to shell blowing; an aluminum alloy solution is smelted, and then, a mould shell for wrapping the metal core is poured; the mould shell is cleaned by a hydraulic shell cleaning machine; and after the residual mould shell is removed from an inner cavity, the mould shell is immersed by water, and the metal core is taken out by a fixture. By the method for preparing the metal core for the investment casting, many problems of low surface roughness of a sand mould, low strength of a plaster core and oxidization of a copper core for investment casting during mould shell roasting are solved, the problems of complicated working procedures and low yield rate are solved, and the aluminum alloy casting meeting technical requirements is produced.

The invention discloses a ductile iron bar for increasing the number of graphite nodules with SiC. The ductile iron bar comprises, by weight, 3.1%-3.6% of C, 2.4%-3.3% of Si, 0.2%-0.4% of Mn, 0-0.10% of P, 0-0.06% of S and the balance Fe. The weight percentage sum of the compositions is 100%. The invention further discloses a preparation method of the ductile iron bar. According to the ductile iron bar for increasing the number of the graphite nodules with the SiC and the preparation method thereof, surface quality of the ductile iron bar for increasing the number of the graphite nodules with the SiC is good, dimensional precision is high, and the casting defects of sand inclusion, slag inclusion, air holes, shrinkage cavities and the like are avoided; the structure is compact and even from the center to the edge, the number of the graphite nodules of a core part is increased by 20% or above compared with the number of graphite nodules without SiC, the graphite nodule diameter is about grade 6-7, and no obvious large-diameter graphite exists; and the edge hardness of the ductile iron bar is lowered by HB20 or above, the core part and surface layer hardness difference is decreased to HB20 or below, and processing performance of the ductile iron bar can be improved.

The invention discloses moulding sand special for laser 3D printing and a preparation process and application thereof. The moulding sand comprises forming filling matter, forming curing agents, catalytic agents and addition agents, and the forming filling matter is foundry sand, and accounts for 92.5 percent to 97 percent of the total sand weight. The forming curing agents are furan resin and account for one percent to three percent of the total sand weight. The catalytic agents are p-toluenesulfonic acid, and account for 0.5 percent to one percent of the total sand weight. The addition agents are bentonite and borax, the bentonite accounts for 1.5 percent to three percent of the total sand weight, and the boric acid accounts for zero percent to 0.5 percent of the total sand weight. The moulding sand has the advantages that in the moulding sand forming process, the moulding sand can be formed without a mould, the size precision and strength are high, and a laser 3D printing method used in moulding sand is specially suitable for new product development, sample manufacturing and complex moulding sand manufacturing.

The invention discloses a gel injection molding method for high-gravity alloy, which belongs to the field of powder metallurgy. The method is characterized by comprising the following steps: firstly, weighing metal powder of tungsten, nickel, iron, copper, molybdenum, and the like used as raw materials with the average particle size of 1 to 100 micros according to a proportion, and ball-milling the metal powder for 1 to 20 hours to mix the metal powder evenly; then, mixing a monomer and a cross linker in a mass ratio of (1-250): 1, and dissolving the mixture into deionized water to obtain 10 to 55 percent solution; adding the evenly-mixed alloy powder and dispersant accounting for 0.01 to 5 percent of the volume of the alloy powder into the solution, ball-milling the mixture for 2 to 10 hours to form slurry with good fluidity, and exhausting the air for 5 to 60 minutes; and adding 0.02 to 2 percent of catalyst and initiator accounting for 0.02 to 5 percent of the mass of the monomer into the slurry, stirring the mixture evenly and slowing injecting the mixture into a die after exhausting, solidifying the mixture for 20 to 180 minutes at the temperature of between 20 and 70 DEG C, then releasing the solidified mixture from the die, drying the mixture for 30 to 120 hours in vacuum, and then sintering the mixture for 0.5 to 3 hours at the temperature of between 1,100 and 1,550 DEG C to obtain high-gravity alloy workpieces. The molded alloy workpieces have consistent performance, small weight dispersion degree, high size precision and high yield. The method does not need complex equipment and special degreasing process, and has simple process and low production cost.

The invention discloses an aluminasol bonded alumina mould case and a manufacturing method thereof. The slurry of the alumina mould case comprises aluminasol, alumina powder, a mineralizing agent, a dispersing agent, a defoaming agent and a moisturizing agent. In the invention, the alumina mould case is manufactured by using a molten mould precision casting process. The aluminasol bonded alumina mould case of the invention fully utilizes the characteristics of the two materials of aluminasol and alumina at low temperature and high temperature, the morphology of the section of the manufacturedmould case is observed under a scanning electron microscope, and the section has obvious layering structure. The layering structure occurred in the aluminasol bonded alumina mould case is caused by different particle sizes of alumina sands connecting two adjacent layers of the slurry, which is beneficial to interlayer bonding. Thus, the strength of the mould case is increased, the air permeability of the mould case is also increased, and thus, the mould case has enough strength and air permeability when the mould case is used at high temperature.

A thermoacid generator for antireflective film formation, characterized by being represented by the following formula (1):

(wherein R¹ represents C_1-20 alkyl, alkenyl, oxoalkyl, or oxoalkenyl (hydrogen atoms in these groups may have been replaced with fluorine atoms); R² represents linear, branched, or cyclic C_1-20 alkyl, alkenyl, oxoalkyl, or oxoalkenyl, C_6-20 aryl, or C_7-12 aralkyl or aryloxoalkyl; R³ represents hydrogen or alkyl; and Y⁻ represents a non-nucleophilic counter ion); a composition for forming an antireflective film; and an antireflective film made from the composition. With the thermoacid generator and composition, satisfactory etching resistance and the satisfactory ability to prevent the reflection of short-wavelength light (ability to absorb short-wavelength light) are attained. Furthermore, the antireflective film can inhibit an overlying photoresist film from generating a scum.