60results about How to "Control residual stress" patented technology

A superhard compact having an improved superabrasive-substrate interface region design for use in drilling bits, cutting tools and wire dies and the like. This compact is designed to provide an interface design to manipulate residual stresses to enhance the working the strength of the compact. The compact is provided with a network on interface features that share common walls to form cavities.

The present invention relates to a surface treatment apparatus and method for inducing compressive residual stress in the surface of a workpiece with dimensional variations. The method comprises the acts of measuring the dimensions of the workpiece during a surface treatment operation and adjusting the surface treatment process parameters to account for the measured dimensions. In one embodiment, the apparatus comprises two surface treatment elements oriented in opposition to one another in a caliper configuration. The surface treatment elements are positioned and impinged against the surface of a workpiece by an actuator controlled by a computer control unit. The depth to which the surface treatment elements are impinged is precisely controlled to achieve the desired magnitude and depth of compressive residual stress. A sensor operatively connected to the apparatus senses and relays the dimensions of the workpiece to a computer control unit that adjusts the operating parameters accordingly.

The invention belongs to the technical field of metallurgy, and provides a large-diameter seamless steel tube for high-pressure gas cylinders and a manufacturing method thereof. The large-diameter seamless steel tube for high-pressure gas cylinders comprises the following chemical components in percentage by mass: 0.30-0.60% of C, 0.20-0.50% of Si, 0.20-0.60% of Mn, at most 0.010% of P, at most 0.010% of S, 0.90-1.70% of Cr, 2.50-3.50% of Ni, 0.25-0.55% of Mo, 0.05-0.25% of V and the balance of Fe. The manufacturing method adopts spongy iron and scrap steel as raw materials for steelmaking. The large-diameter seamless steel tube has the advantages of high heat stability, high strength, impact toughness, stable enduring plasticity, high heat resistance, excellent corrosion resistance and excellent fatigue resistance, and the yield strength is not lower than 1000 MPa.

The invention provides a high-performance thermal barrier coating for a heavy duty gas turbine blade, and a multi-process combination preparation method thereof, and belongs to the technical field ofgas turbine blade thermal barrier coatings. The preparation method comprises the steps of preparing an MCrAlY bonding layer with a laser cladding technology, and regulating an MCrAlY cladding layer structure and stress state with a laser shock strengthening technology largely; machining a micro-pit structure in the surface of a strengthening layer with a laser shock micro-modeling technology selectively, and preparing a YSZ ceramic layer with an atmospheric plasma spraying technology; and controlling the corresponding parameters to obtain the thermal barrier coating. The thermal barrier coating provided by the invention is higher interface bonding strength, high temperature oxidation resistance and thermal shock resistance; and the requirements of the thermal barrier coating of a gas turbine for high thermal insulation, oxidation resistance, long life and large-area controllable preparation are met; and the preparation method has broad market prospects.

The invention discloses a multi-energy-field collaborative forming manufacturing method for a high-performance bearing base body. The multi-energy-field collaborative forming manufacturing method comprises the following steps that S1, forming the bearing base body through a cold ring rolling process; S2, synchronously applying electric pulses and magnetic pulses to the bearing base body, and carrying out electromagnetic coupling auxiliary treatment; S3, carrying out complex phase structure regulation and control heat treatment on the bearing base body to obtain a martensite complex phase structure; and S4, synchronously applying electric pulses and magnetic pulses to the bearing base body, and carrying out electromagnetic coupling strengthening treatment. The multi-energy-field synergisticeffect of the force field, the electric field, the magnetic field and the thermal field is comprehensively utilized, the force field and the electromagnetic field are introduced on the basis of a traditional thermal field to carry out multi-scale regulation and control on the base body structure performance, and therefore the structure stability, the structure toughness and the performance consistency are remarkably improved.

A lamination molding apparatus, includes a material layer former to form a material layer; a first emitter to form a solidified layer by irradiating the material layer with a first beam; and a thermal adjuster to adjust a temperature of at least a portion of the solidified layer to at least one of a predetermined first temperature and a predetermined second temperature. The temperature of at least the portion of the solidified layer is adjusted to the first temperature, and then to the second temperature. When the first temperature is referred to as T1, the second temperature is referred to as T2, a martensite start temperature of the solidified layer is referred to as Ms, and a martensite finish temperature of the solidified layer is referred to as Mf, all of the following relations of T1≥Mf, T1>T2, and T2≤Ms are satisfied.

The invention discloses a high-performance surface composite strengthening method for shaft parts, and belongs to the field of surface machining of metal materials. The surface composite strengtheningmethod comprises the following steps that S1, carrying out radial vibration turning on the shaft parts, and forming a specific regular distributed micron scale/nano scale microcosmic geometrical morphology on the surfaces of the shaft parts; S2, coating the surfaces; and S3, carrying out mechanical reinforcement treatment on the coating surfaces by adopting an ultrasonic rolling processing technology. Compared with the prior art, the high-performance surface composite strengthening method for the shaft parts can greatly improve the bonding strength of a bonding interface of a base material and a coating layer, meanwhile, the hardness, the fatigue strength and the wear-resistant and corrosion-resistant shaft parts of the final forming surfaces are improved, and the method has good popularization and application values.

The invention relates to a high-temperature brazing connection method for graphite and stainless steel. The high-temperature brazing connection method for the graphite and the stainless steel comprises the following steps of selecting an amorphous brazing filler metal foil and a plastic metal foil as brazing materials; using cleaned graphite, stainless steel, amorphous brazing filler metal foil and plastic metal foil to form a graphite/amorphous brazing filler metal foil/plastic metal foil/amorphous brazing filler metal foil/stainless steel sandwich structure; and placing the structure in a vacuum furnace, increasing the temperature to 1040 to 1180 DEG C at the speed of 5 to 10 DEG C/min, conducting heat preservation for 30 to 90 min, conducting brazing connection, and then conducting sectional heat preservation and slow cooling to the room temperature. The high-temperature brazing connection method for the graphite and the stainless steel provided by the invention effectively solves the problems of serious mismatching and wettability of the thermal expansion coefficients of the graphite and the stainless steel, is beneficial to greatly reducing the residual stress of a joint and avoiding the formation of cracks, and realizes good connection between the graphite and the stainless steel.

The embodiment of the invention provides a method for machining a metal sheet and a milling machine. The metal sheet comprises a front surface, a back surface, a side surface and a through hole located in the center of the metal sheet, wherein a groove is formed around the through hole; a plurality of special-shaped slots are formed in the front surface; and a reinforcement structure is arranged on the back surface. The method comprises the steps of roughly milling the front surface, the back surface, the side surface and the through hole, performing semi-finish milling on the side surface ofthe metal sheet, turning over the metal sheet many times, performing semi-finish milling on the groove around the through hole, the special-shaped slots in the front surface and the reinforcement structure on the back surface, turning over the metal sheet many times, and performing finish milling on the groove around the through hole, the special-shaped slots on the front surface and the reinforcement structure on the back surface. According to the machining method, residual stress on the surface and in the metal sheet can be effectively controlled; a deformation error of the metal sheet due to stress release is reduced; and the machining precision is guaranteed.

The invention relates to a high-temperature brazing connection method for graphite and stainless steel. The high-temperature brazing connection method for the graphite and the stainless steel comprises the steps of selecting amorphous TiZrNiCu foil brazing filler metal, a Ti foil, an amorphous BNi-2 brazing filler metal foil and an Ni foil as brazing materials; after cleaning the graphite, the stainless steel, the amorphous TiZrNiCu foil, the Ti foil, the amorphous BNi-2 foil and the Ni foil, forming a graphite/amorphous TiZrNiCu foil/Ti foil/amorphous BNi-2 foil/Ni foil/amorphous BNi-2 foil/stainless steel sandwich structure; and placing the structure in a vacuum furnace, increasing the temperature to 980 to 1080 DEG C at the speed of 5 to 8 DEG C/min, conducting heat preservation for 60 to 120 min, conducting brazing connection, and then conducting sectional heat preservation and slow cooling to the room temperature. The problems of serious mismatching and wettability of the thermal expansion coefficients of the graphite and the stainless steel are effectively solved, the thermal stress of a joint is greatly reduced, cracks are prevented from being generated in the joint area, and good connection of the graphite and the stainless steel is achieved.

A method of press-forming a tubular part having a cross section of an irregular shape crushes a steel tube between an upper die and a lower die in order to form a V-shaped cross section. When the curvature radius of a tip of the upper die is defined as R₁, the curvature radius of a bottom portion of the lower die corresponding to the tip of the upper die is defined as R₂, and the wall thickness of the steel tube is defined as t; R₁, R₂, and t satisfy R₁+2t=R₂ and 1.5t≦R₁≦3t.

The invention discloses a high speed extrusion forming mold of a blade. The high speed extrusion forming mold of the blade comprises a blade basin mold and a blade back mold, wherein the blade basin mold and the blade back mold are manufactured according to the following steps: step A, according to data of the theoretical blade profile of the blade part, selecting a plurality of characteristic sections from the blade body portion, and obtaining a basic blade basin curve and a basic blade back curve of a corresponding characteristic section of a new blade blank after adding allowance accordingto 3%-5% of the maximum thickness of the blade body portion of the theoretical blade profile in the normal direction for each characteristic section of the theoretical blade profile; step B, obtaininga final blade basin face and final parameters of the corresponding characteristic sections of the new blade blank from all the characteristic sections of the new blade blank obtained in the step A; step C, obtaining continuous and complete profile surfaces and parameters of the blade body portion of the new blade blank; and step D, designing and manufacturing the blade basin mold and the blade back mold. The high speed extrusion forming mold of the blade can reduce reserved allowance of the blade blank.

The invention discloses a laser cladding device and a laser cladding method for a long and thin workpiece. The laser cladding device comprises a clamping jaw, an ejector pin, a telescopic preheating sleeve, a laser cladding nozzle, a first guide rail and a second guide rail, wherein the clamping jaw and the ejector pin clamp the two ends of the workpiece; the laser cladding nozzle slides on the first guide rail; the telescopic preheating sleeve comprises a plurality of sections of heating cylinders of which the diameters are sequentially reduced from the clamping jaw to the ejector pin; the heating cylinder with the maximum diameter is connected to the first guide rail through a first bracket in a sliding manner; the heating cylinder with the minimum diameter is connected to the second guide rail through a second bracket in a sliding manner; the telescopic preheating sleeve synchronously moves and contracts along with the movement of the laser cladding nozzle, so that the workpiece isalways kept in a preheating state before laser cladding; after the laser cladding of the workpiece is finished, the telescopic preheating sleeve reversely moves and stretches, so that the workpiece issubjected to heat treatment; the workpiece is clamped and then preheated, so that the safety of a worker in the operation process is protected; and the workpiece is preheated and subjected to heat treatment, so that the residual stress of a cladding layer can be effectively controlled, the crack damage is reduced, and the laser cladding quality is improved.

The invention discloses a method for controlling forged blade extrusion molding residual stress. The method comprises the following steps: (A) according to theoretical blade type data of blade parts,basic molded surfaces and parameters of corresponding characteristic sections of blade blanks are obtained; (B) new blade basin part curves are obtained on each characteristic section of the blade blanks obtained in the step (A); (C) continuous and complete molded surfaces and parameters of blade body parts of new blade blanks are obtained after molded surfaces and parameters of all characteristicsections of the new blade blanks are obtained in the step (B); and (D) new blade basin molds are designed according to the molded surfaces and the parameters of the new blade blanks obtained in the step (C) to manufacture the new blade blanks. The method for controlling forged blade extrusion molding residual stress can effectively control residual stress of the blades generated in a high-speed extrusion molding process to greatly improve the pass percent of the blade blanks.

The invention belongs to the technical field of surface engineering and cutting tools, and discloses a high-toughness TiAlNiN coating and a preparation method and application thereof. The coating has the molecular formula of Ti < x > Al < y > Ni < z > N, wherein x is 15.00 to 65.00 at.%, y is 15.00 to 65.00 at.%, z is 5.00 to 20.00 at.%, x + y + z = 100%, and the atomic ratio of metal to nitrogen is normalized to be 1: 1. According to the high-toughness TiAlNiN coating and the preparation method and application thereof, an arc ion plating deposition method is adopted, a TiAl alloy target containing Ni is used, the prepared TiAlNiN coating is high in deposition rate and good in film-substrate binding force, a nitride/metal two-phase composite structure is obtained by introducing a metal phase, the hardness is high, the toughness is remarkably superior to that of a traditional TiAlN coating, the TiAlNiN coating is suitable for tools and molds with the surfaces subjected to certain impact loads, the service performance is improved, and the service life is prolonged.

The invention discloses an anti-fatigue efficient milling parameter optimization control method for a titanium alloy thin-wall component. The method comprises the following steps that: establishing the primary election technological parameter domain of a titanium alloy thin-wall component; carrying out an orthogonal test; testing the surface integrity parameter of a test component; establishing acharacteristic relational expression of a titanium alloy thin-wall component milling technological parameter and surface integrity; according to the relational expression of the titanium alloy thin-wall component milling technological parameter and the surface integrity, a target function and a milling technological parameter constraint condition, establishing an optimization model for the anti-fatigue efficient milling parameter of the titanium alloy thin-wall component; and through an optimization tool in MATLAB, solving the optimization model for the anti-fatigue efficient milling parameterof the titanium alloy thin-wall component to obtain the anti-fatigue efficient milling parameter of the titanium alloy thin-wall component. By use of the method, the problems of poor surface integrity characteristic and low material removal rate in a milling process of the titanium alloy thin-wall component are solved.

The invention discloses a method and a device for controlling milling deformation of a large sized structural member, belonging to the part processing deformation control in the field of mechanical engineering. The control method is characterized by comprising the following steps of: simultaneously spraying cooling liquid on the rear part of a milling cutter when the cooling liquid is sprayed on the front part of the milling cutter, and rolling by using a deformation controller. The invention can be used for effectively releasing stress deformation generated in the milling process of the large sized structural member so as to achieve the purpose of controlling the processing deformation of the large sized structural member.

The invention relates to the technical field of electronic processing, more specifically, the present invention relates to a packaging method for inhibiting the drifting and warping of a chip. The method comprises the steps of manufacturing a first groove in a first rigid carrier plate, manufacturing a patterned protrusion at the bottom of the first groove, laying an injection molding material flatly in the first groove and then heating the injection molding material to be molten, then inserting a chip to be packaged into the molten injection molding material in an inverted mode, carrying outthe controllable temperature field type heating curing to obtain a packaged chip obtained after plastic packaging. When a special packaging structure and a curing sequence need to be realized, or under the conditions or requirements of a thicker chip to be packaged or an injection molding material with over-high viscosity and the like, a multi-time inversion method can be adopted to realize the multi-material and multi-sequence injection molding curing. According to the invention, the controllable temperature field type temperature rise and the structural design of the rigid support plate arecombined, so that the controllable curing molding of the multi-layer packaging structure can be realized, the shrinkage force during the curing of the injection molding material and the residual stress of the cured packaging body are regulated and controlled, and the drifting and warping of the chip are reduced.

The invention is a wide-frequency domain, silicon-micromachined, tunable filter making method, comprising the steps of: making a first electrode on a substrate and making electrode lead wire outlet in electrode layer; making a first reflector on the first electrode, one of the necessary reflectors for the filter; making a sacrificial layer on the first reflector and making a second reflector on the sacrificial layer, where the two reflectors as well as an air cavity formed after the release of the sacrificial layer form a filtering-mode selecting structure; making a second electrode and a stress control film layer on the second reflector; corroding and releasing the sacrificial layer to form the air cavity, where when a voltage is applied between the two electrodes, the thickness of the air cavity changes because of static absorption and the transmission mode of the filter changes with the change of the thickness of the air cavity, so that the filter has an adjustable-wavelength mode- selecting effect.

The invention discloses a method for reducing residual stress of high-speed extrusion formed blades. The method comprises the following steps: (A) basic molded surfaces and parameters of correspondingcharacteristic sections of blade blanks are obtained according to theoretical blade profile data of blade parts; (B) new blade basin part curves are obtained on each characteristic section of the blade blanks obtained by the step (A); (C) continuous and complete molded surfaces and parameters of blade body parts of new blade blanks are obtained after molded surfaces and parameters of all characteristic sections of the new blade blanks obtained in the step (B); and (D) new blade basin molds are designed according to the molded surfaces and the parameters of the new blade blanks obtained in thestep (C) to manufacture the new blade blanks. The method for reducing the residual stress of the high-speed extrusion formed blades can effectively control the residual stress of the blades in the high-speed extrusion forming process to greatly improve the subsequent machining pass percent of the blade blanks.