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

A method of processing cobalt-base alloy superfine thin-walled tubes for stents

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.

Manufacturing method of nuclear nickel-base high-temperature alloy GH 4145 wire

ActiveCN105483448AHigh dimensional accuracyGood surface qualitySolution treatmentHot rolled
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.

Split joint type communication cabinet

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.

Ceramic mobile-phone rear cover and preparation method thereof

InactiveCN107673757AHigh dimensional accuracyYttria-stabilized zirconiaHot isostatic pressing
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.

Milling tool as well as segment therefor

InactiveCN102837078AHigh positioning reliabilityHigh dimensional accuracyMilling cuttersGear teeth manufacturing toolsEngineeringCam
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.

New method for manufacturing composite coating shell for precisely casting fusible patterns

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.

Coaxial powder feeding and laser forging compound additive-subtractive manufacturing method and device

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.

Bearing ring turning and cutting feed method

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.

On-line core making technology and device

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.

Method for preparing metal core for investment casting and precision investment casting method for aluminum alloy casting based on metal core

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.

Ductile iron bar for increasing number of graphite nodules with SiC and preparation method thereof

ActiveCN107338390AGood surface qualityHigh dimensional accuracySlagSuperficial mass
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.

Gel injection molding method for high-gravity alloy

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.
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