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105 results about "Case hardening" patented technology
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Case-hardening or surface hardening is the process of hardening the surface of a metal object while allowing the metal deeper underneath to remain soft, thus forming a thin layer of harder metal (called the "case") at the surface. For iron or steel with low carbon content, which has poor to no hardenability of its own, the case-hardening process involves infusing additional carbon or nitrogen into the surface layer. Case-hardening is usually done after the part has been formed into its final shape, but can also be done to increase the hardening element content of bars to be used in a pattern welding or similar process. The term Face hardening is also used to describe this technique, when discussing modern armour.
Heat treatment process for improving strength and toughness of die steel
The invention discloses a heat treatment process for improving the obdurability of die steel, and belongs to the technical field of metal heat treatment. The invention relates to a heat treatment process for improving the toughness of die steel, which adopts a die steel material with a specific component proportion, and the die steel material comprises carbon, chromium, molybdenum, vanadium, tungsten, nickel, niobium, niobium carbide and trace boron element. By sequentially implementing austenitizing, quenching, deformation heat treatment, multi-stage subzero treatment, pulsed magnetic field assisted tempering, gradient surface hardening and nano-precipitation regulation treatment, the hardness and toughness of the die steel are remarkably improved. Particularly, through the synergistic effect of multiple advanced heat treatment means, the martensite structure is effectively refined, carbide precipitation is strengthened, the surface hardness and the core toughness are improved, the comprehensive performance of toughness and toughness is achieved, and the method is suitable for the field of high-performance injection molds and hot-working molds.
Owner:SHANGHAI YISHUN MOULD TECH CO LTD
Surface hardening method for universal joint of screw drill and related universal joint
The invention discloses a surface hardening method for a universal joint of a screw drill and the related universal joint. The method comprises the following steps: carrying out thermal refining and finish machining on a universal joint blank subjected to rough turning to obtain a universal joint body; after the universal joint body is preheated, spot welding is conducted on the tungsten-cobalt alloy block wrapped by the nickel-based brazing filler metal to the wear-resisting contact face at one end of the universal joint body; spraying and welding nickel tungsten carbide powder and nickel-coated boron carbide composite powder on the wear-resistant contact surface to form a hardened layer on the wear-resistant contact surface; after cooling, the spray welding working face is ground to the designed size; checking pores of the spray welding working surface after grinding, filling the pores with composite powder of nickel tungsten carbide powder and nickel-coated boron carbide, and heating and melting to seal and fill the pores; and after cooling, the universal joint is finely ground to the designed size. The wear resistance and the impact fracture resistance of the universal joint are greatly improved, so that the universal joint can be matched with other screw drilling tool parts resistant to the high temperature of 350 DEG C to jointly form a screw drilling tool resistant to the high temperature of 350 DEG C.
Owner:CHINA NAT PETROLEUM CORP +2
Manufacturing method of surface hardening agricultural machine tool
The invention relates to the technical field of steel for agricultural machinery, in particular to a manufacturing method of a surface hardening agricultural machinery tool. Comprising the steps of smelting, continuous casting, casting blank treatment, rolling, cooling, surface treatment, part forming, heat treatment and local surface hardening treatment. The obtained hot-rolled plate is free of surface scale, the hardness after heat treatment is 53 HRC or above, the surface hardness difference is + / -0.5 HRC, the tensile strength is 1800 MPa or above, the ductility is larger than or equal to 8%, the ballistic work Akv at the temperature of 20 DEG C is larger than or equal to 20 J, tempering treatment, sand blasting and tumbling are not needed, the hardness of an agricultural machine tool obtained after surface local hardening treatment is 60 HRC or above, and the wear resistance is obviously improved.
Owner:ANGANG STEEL CO LTD
Material combinations and processing methods for surgical instruments
To provide improved surgical instruments. [Solution] Surface preparation of sliding surfaces can improve the wear performance of surgical instruments such as surgical staplers, which include a reusable mechanism that is used multiple times with a single-use reloadable cartridge. A combination of surface hardening, surface finishing, and surface coating can be applied to the metal components of surgical instruments to reduce the possibility of abrasive wear in metal-to-metal sliding engagements. Surface hardening technology can enable further manufacturing operations such as welding without compromising the strength of the underlying metal substrate. With stainless steel metal substrates, surface hardening or surface hardening technology may reduce corrosion resistance, so a surface coating can be added to suppress surface oxidation and to provide a barrier against metal-to-metal contact. Further lubricating coating layers, such as a brazing coating layer, can enhance abrasion resistance.
Owner:APPL MEDICAL RESOURCES CORP
Rolling bearing steel ball hardening device and hardening method
This invention discloses a hardening device and method for rolling bearing steel balls, relating to the field of surface hardening treatment technology. The hardening device includes a bath, an elastic base disposed below the bath, a working medium and steel balls inside the bath, the working medium comprising alloy element powder, abrasive powder, and a conductive solution, a pulsed plasma gun positioned above the bath, the outlet end of the pulsed plasma gun inserted into the bath with its axis intersecting the vertical axis of the bath at an acute angle, and an electromagnet for attracting steel balls mounted on the surface of the bath. A matching hardening method is also provided. The technical solution of this invention forms a high-hardness alloy layer on the surface of the steel ball, improving the hardening quality of the steel ball surface and enabling the steel ball to meet the performance requirements for use under high load and corrosive environments.
Owner:浙江巴顿焊接技术研究院 +3
Method for eliminating helium bubble defect in nuclear power steel and product
The invention relates to a method and a product for eliminating helium bubble defects in nuclear power steel, which comprises the following steps of: treating the nuclear power steel which is damaged by helium ion irradiation to generate helium bubble gathering and surface hardening by pulse current, eliminating the helium bubble defects, recovering the surface hardness of the nuclear power steel, and realizing dynamic self-repairing of irradiation damaged tissues of the nuclear power steel. The method is suitable for pulse current elimination of irradiation helium bubble defects of nuclear power steel such as austenitic stainless steel and austenite-ferrite duplex stainless steel, and is also suitable for pulse current elimination of irradiation helium bubble defects of any metal material. Experiments prove that helium bubbles induced by irradiation cause serious hardening of the surface of the material, and after the helium bubbles are eliminated through pulse current treatment, nanoindentation tests show that the hardness of the material is remarkably reduced and basically returns to the original level before irradiation. The method has the advantages of short treatment time and low energy consumption, and can effectively prolong the service life of key components such as nuclear-grade main pipelines.
Owner:UNIV OF SCI & TECH BEIJING
Metal surface hardened layer depth standard test block
ActiveCN121540812AAnalysing solids using sonic/ultrasonic/infrasonic wavesUsing subsonic/sonic/ultrasonic vibration meansStructural engineeringCase hardening
The invention belongs to the field of hardened layer depth detection, and relates to a metal surface hardened layer depth standard test block. The whole standard test block is half-ship-shaped, and a stepped hardened layer area is arranged at the upper end of the standard test block and used for detecting the depth of a hardened layer of a plane component. A small-curvature outer cambered surface hardened layer area is arranged at the left end and is used for detecting the depth of a hardened layer on the outer surface of a thin shaft type component and a special-shaped component; a small-curvature inner cambered surface hardened layer area is arranged at the lower end and is used for detecting the hardened layer depth of the inner surfaces of the pipes and the special-shaped components; a large-curvature outer cambered surface hardened layer area is arranged at the lower part of the right end, namely the bow position, and is used for detecting the depths of hardened layers on the outer surfaces of column, shaft, pipe and disc components; a large-curvature inner cambered surface hardened layer area is arranged at the upper part of the right end and is used for detecting the hardened layer depth of the inner surfaces of the pipe and disc components. The test block provided by the invention simultaneously meets the requirements of hardened layer depth detection equipment calibration and hardened layer depth verification of various components.
Owner:INNER MONGOLIA FIRST MASCH GRP CORP CO LTD
High-precision rapid positioning countersunk head screw for sheet metal connection and machining method of high-precision rapid positioning countersunk head screw
The invention provides a high-precision rapid positioning countersunk head screw for sheet metal connection and a processing method thereof, which can solve the problems of low positioning precision and unstable connection of the existing countersunk head screw, the high-precision rapid positioning countersunk head screw is integrally formed by a screw head and a screw rod, the screw head is provided with a double-taper-angle structure and a reverse radial insection, and the screw rod is internally provided with a screw rod channel. The detachable positioning cone is inserted into the screw channel, the slot of the screw is in sliding connection with the insertion block of the positioning cone, and the threaded part of the screw is provided with a spiral glue overflow groove which is matched with the threaded part to realize double threads and bonding sealing; multi-station cold heading is adopted for one-time forming of screw head double taper angles, thread rolling, whirlwind milling of glue overflowing grooves and laser cutting of inserting grooves, then the positioning cone is assembled, surface hardening treatment is carried out, the process is short, precision is high, cost is low, and the method is suitable for high-strength, anti-loosening and sealing connection of sheet metal parts and has high positioning precision, connection reliability and loosening resistance.
Owner:HAIYAN NEW SHENGDA FASTENER
Hardfacing alloys and related methods and products
A surface of a tool or other object may have a hardfacing deposit thereon that comprises a hardfacing alloy. Said hardfacing alloy may include: about 0.9 wt%to about 1.5 wt%carbon, about 1.5 wt%to about 2.5 wt%boron, about 0.5 wt%to about 1 wt%manganese, about 0.7 wt%to about 2.2 wt%silicon, about 5.5 wt%to about 8 wt%chromium, about 7 wt%to about 10 wt%niobium, about 0.2 wt%to about 0.7 wt%titanium, about 0.4 wt%to about 0.8 wt%vanadium, 0 wt%to about 0.2 wt%aluminum, 0 wt%to about 0.1 wt%total impurities, and a balance iron, wherein each wt%is based on a total weight of the hardfacing alloy. Examples of tools may include pipe joints, center wear pada, tubing connections, tube bodies, drill collars, stabilizers, earthmoving equipment, and dredging equipment.
Owner:ATT TECH LTD +1
Ball joint and method for manufacturing ball joint
The invention provides a ball joint capable of improving rigidity of a columnar part and a method for manufacturing the ball joint. A ball joint (100) is provided with a columnar section (110) and a housing (120). The columnar section (110) is provided with: a connection section (111) that is connected to an object to be connected (10); a flange-shaped receiving part 115 on which the object 10 to be connected is placed; and a ball part 114 having a spherical surface. A male thread part 112 for fastening the mounting nut 12 is formed on the connecting part 111. The flange-shaped receiving section (115) is formed so as to protrude radially outward from the connecting section (111) in a flange-shaped manner. A surface hardening layer 118 for hardening the surface layer is formed at a boundary portion 117 between the connecting portion 111 and the flange-shaped receiving portion 115.
Owner:SOMIC MANAGEMENT HLDG INC
Furnace building method for double-melting-channel furnace building and corresponding furnace building tool
PendingCN121677376ALinings repairFurnace cooling arrangementsArchitectural engineeringStructural engineering
The invention provides a furnace building method for building a furnace through double melting channels. The problems that in the prior art, positioning is not accurate, fixing is not firm, grooving is not precise, and procedures are scattered are solved. The method comprises the following steps of: filling a base layer at the bottom of a furnace in advance, scraping a melting channel groove, accurately positioning the melting channel, sealing a water jacket opening by using a baffle plate, continuously filling a hearth, removing the baffle plate, cleaning redundant ramming materials between the two melting channels, mounting the water jacket at a preset position, and sealing the edge. And after secondary filling and surface hardening are completed, coil-iron core assembling is conducted, and furnace building is completed.
Owner:CHINA RAILWAY CONSTR ELECTRIFICATION BUREAU GRP KANG YUAN NEW MATERIALS CO LTD +2
Turning blade for heavy-load rough machining of high-temperature alloy and stainless steel
The utility model discloses a turning blade for heavy-load rough machining of high-temperature alloy and stainless steel, the upper end part and the lower end part of a blade main body are both polygonal structures, main cutting edges or auxiliary cutting edges are formed at the joints of the upper end part and the lower end part and each side wall connected with the upper end part and the lower end part, and the main cutting edges and the auxiliary cutting edges are arranged at intervals; polygonal chip breaking tables are formed in the middle of the upper end face and the middle of the lower end face respectively, and the number of the side edges of the chip breaking tables is the same as that of the upper side edges of the blade body. A sharp cutting edge can be formed, the deformation degree of cuttings can be increased, the cuttings can be guided to flow out smoothly, meanwhile, the strength of the cutting edge is increased, the service life is prolonged, cutting force can be reduced, the deformation degree of material grains is reduced, the surface hardening degree of a workpiece is reduced, built-up edges are avoided, cutting heat is controlled, and the service life of the cutting edge is prolonged. The utility model particularly relates to heavy and rough cutting machining of high-temperature alloys such as GH4169 and Inconel 718 and difficult-to-machine materials such as stainless steel.
Owner:DONGGUAN ZHONGJI RONGYAO METAL CUTTING TOOL CO LTD
Surface-hardened steel with uniformly distributed hardness of hardening layer and manufacturing method of surface-hardened steel
The invention discloses a surface hardening steel with uniformly distributed hardness of a hardening layer, which contains Fe and inevitable impurities, and further contains the following chemical elements in percentage by mass: 0.34 to 0.42 percent of C, 0.1 to 0.4 percent of Si, 0.7 to 1.4 percent of Mn, 0.02 to 0.25 percent of Cr, 0.02 to 0.15 percent of Mo, 0.015 to 0.05 percent of Al, 0.001 to 0.0035 percent of B, 0.02 to 0.06 percent of Ti, 0.01 to 0.035 percent of S, 0.003 to 0.008 percent of N and the balance of Fe. And no Cu element is contained. The invention further discloses a manufacturing method of the steel. The manufacturing method comprises the following steps: smelting and casting; heating and rolling; normalizing after rolling; surface quenching and low-temperature tempering are carried out, wherein the surface quenching temperature is 830-950 DEG C; and the low-temperature tempering temperature is 150-250 DEG C, and the heat preservation time is 1-3 h.
Owner:BAOSHAN IRON & STEEL CO LTD
Steel-based composite material grinding ball with hard outside and tough inside as well as preparation method and application of steel-based composite material grinding ball
The invention discloses a steel-based composite material grinding ball hard outside and tough inside and a preparation method and application thereof.The diameter of the steel-based composite material grinding ball is 100-150 mm, the steel-based composite material grinding ball sequentially comprises a surface hardening layer and a core area from outside to inside, the average Rockwell hardness of the surface hardening layer is 58-63 HRC, and the average Rockwell hardness of the core area is 60-80 HRC. The average Rockwell hardness of the core area is 50 to 53 HRC, and the unnotched impact toughness of the core area is 10 to 14.5 J / cm < 2 >; according to the method, through component design and reasonable control over the cooling path and the heat treatment process, gradient distribution of the organization structure and the mechanical property is achieved, and the fracture resistance and the service stability of the large-size grinding ball are fundamentally improved.
Owner:JINAN UNIVERSITY
Rapid manufacturing process of 3D printing sand mold outer mold for static pressure molding line
The invention discloses a rapid manufacturing process of a 3D printing sand mold outer mold for a static pressure molding line, and relates to the technical field of casting. The process is different from conventional metal mold and wood mold manufacturing processes, an outer mold body blank is rapidly manufactured through the 3D printing technology, and then hardening and surface smoothing treatment are conducted through hardening liquid. Through hardening of the hardening liquid, the surface strength and hardness of the outer mold body can be greatly improved, the outer mold body can completely bear the molding pressure (1.2 Mpa) of a static pressure molding line, the hardened sand mold can pass through at least 300 molds without deformation, and the dimensional tolerance stability is good. The surface of the outer mold body is smooth through surface smoothing treatment, and the sand scrabbling defect is avoided. Surface treatment is matched with surface hardening, the manufacturing period of the outer mold can be shortened, the manufacturing cost of the outer mold can be reduced, and meanwhile the use requirement of a static pressure molding line can be met.
Owner:SINO TRUK JINAN POWER CO LTD
Premixing device for stirring concrete surface hardening agent and preparation process of premixing device
PendingCN120838253AShaking/oscillating/vibrating mixersTransportation and packagingAgitatorCase hardening
The invention relates to the technical field of mixing and preparation of surface hardening agents, and discloses a premixing device for stirring a concrete surface hardening agent and a preparation process thereof.The premixing device comprises a stirring cabin arranged on a structural frame of the premixing device and used for containing a solution solute for preparing the concrete surface hardening agent; a hollow and one-way through sealing shaft is fixedly arranged in the stirring cabin, at least two bearings are arranged outside the sealing shaft, and the stirrer is rotationally arranged outside the sealing shaft in a sleeving manner; and the stirrer comprises a magnetic induction rotating shaft sleeved on the bearing, a supporting rod fixed outside the magnetic induction rotating shaft and an outer ring spiral stirring blade welded and fixed on the supporting rod. Silicate is added into a stirring cabin through a solid material feeding hopper, an emulsifying agent and a penetrating agent are added into the stirring cabin through a liquid material feeding hopper, and water is added into the stirring cabin before the silicate, the emulsifying agent and the penetrating agent are added.
Owner:ZHEJIANG DARUIFENG NEW MATERIAL TECH CO LTD
Surface hardening method of screw drill universal joint and related universal joints
This invention discloses a surface hardening method for universal joints in screw drills and related universal joints. The method includes: performing heat treatment and finishing on a rough-machined universal joint blank to obtain the universal joint body; after preheating the universal joint body, spot welding a tungsten-cobalt alloy block wrapped with nickel-based brazing filler metal to the wear-resistant contact surface at one end of the universal joint body; spraying nickel-tungsten carbide powder and nickel-coated boron carbide composite powder onto the wear-resistant contact surface to form a hardened layer on the wear-resistant contact surface; after cooling, grinding the sprayed surface to the design dimensions; inspecting the porosity of the ground sprayed surface, filling the porosity with nickel-tungsten carbide powder and nickel-coated boron carbide composite powder, heating and melting to seal the porosity; and after cooling, precision grinding the universal joint to the design dimensions. This invention greatly improves the wear resistance and impact fracture resistance of the universal joint, enabling it to be used in conjunction with other screw drill components resistant to 350℃ high temperatures to form screw drills resistant to 350℃ high temperatures.
Owner:CHINA NAT PETROLEUM CORP +2
Method and system for measuring longitudinal distance to the hardened area of the surface of a part
PendingEP4534994A4Electric/magnetic position measurementsUsing electrical meansCase hardeningMechanical engineering
The present invention relates to a system and method for the non-destructive measurement of distance to the hardened area (Dh) where the end of a hardened area (1) of a part to be measured is located. Said invention comprises: a) scanning a measurement area of a part by applying a variable magnetic field to the part and measuring an MBN signal by means of a sensor (3); b) processing the MBN signal obtained; and i) training a regression model by using reference parts, which comprises carrying out the previous steps a) and b) on reference parts with a known distance to the hardened area (Dh', Dh"); ii) measuring the part to be measured, which comprises carrying out the previous steps a) and b) on the part to be measured with an unknown distance to the hardened area (Dh); and iii) calculating the distance to the hardened area (Dh) of the part to be measured.
Owner:ASOCIACION CENTRO TECNOLOGICO CEIT +1
Surface-hardened steel and production method for same
The present invention addresses the problem of providing a surface-hardened steel that has excellent cold-forgeability and can sufficiently suppress variations in deformation resistance during cold forging. Provided is a surface-hardened steel that has a prescribed chemical composition and has a structure that comprises ferrite and spheroidized carbides. A dispersion index Vθ that represents the dispersibility of the spheroidized carbides satisfies Vθ≤0.80, and, for test pieces taken at 10 arbitrary locations in the rolling direction of a steel material that comprises the surface-hardened steel, the coefficient of variation CV of the Rockwell hardness at a cross-section that is orthogonal to the rolling direction satisfies CV×100≤0.65.
Owner:SANYO SPECIAL STEEL CO LTD
Production process of wear-resistant and heat-insulating brake pad
The present invention relates to the technical field of brake pad production, and discloses a production process for wear-resistant and heat-insulating brake pads, comprising the following steps: Step 1, powdering, subjecting the friction layer raw material and the heat-insulating layer raw material of the brake pad to powdering, and pre-storing the obtained friction layer powder and heat-insulating layer powder separately. Step 2, introducing the friction layer powder into a mold for hot pressing and forming, and after cooling, evenly arranging the heat-insulating layer powder on the friction layer in the mold, and then hot-pressing a second time to form the friction pad. Step 3, steel back glue coating, placing the steel back after surface hardening treatment on a glue coating machine for glue coating. The present invention not only enhances the heat-insulating effect by improving the purity of the heat-insulating layer, but also performs multiple hot pressing on the friction layer, thereby improving the wear resistance of the friction layer. By improving the steel back glue coating process and equipment, a uniform glue layer can be formed on the steel back, providing good preparation for the bonding of the heat-insulating layer and the steel back in rough blank forming.
Owner:HANGZHOU ANNAT IND
A method for preparing a surface hardened layer of a nickel alloy
This application discloses a method for preparing a surface-hardened layer on a nickel alloy. The method includes using a nickel alloy as a substrate, firstly cleaning and drying the substrate sequentially, followed by ultrasonic rolling; then covering the ultrasonically rolled substrate with a boronizing agent, heating and boronizing at 600-800℃ and holding at that temperature for 3-6 hours; next, under inert gas conditions with a purity greater than 99.5%, subjecting the boronized substrate to solution treatment at 1040-1140℃ and aging heat treatment at 700-850℃; finally, grinding the heat-treated substrate to obtain the target nickel alloy substrate containing the surface-hardened layer. The synergistic combination of ultrasonic rolling and boronizing processes refines the surface microstructure of the nickel alloy, improves the bonding strength between the boronized layer and the substrate, and prevents the formation of microcracks; while ensuring the performance of the surface-hardened layer, it does not damage the original corrosion resistance of the substrate, significantly improving the service life of the nickel alloy under high temperature, high pressure, and strong erosion wear conditions, demonstrating strong process stability and practicality.
Owner:XIAN PUMP & VALVE GENERAL FACTORY CO LTD
Efficient cutting tool structure of automatic oil pressure raw rubber cutting machine
An efficient cutting tool structure of an automatic oil pressure raw rubber cutting machine comprises a blade assembly, a tool handle assembly and a connecting piece. The blade assembly is made of high-strength alloy steel, the surface of the blade assembly is hardened to HRC58-62, reinforcing ribs are arranged to improve bending rigidity and reduce cutting deformation, protective edges on the arc-shaped side edges of the blade assembly can prevent raw rubber fragments from splashing, a front-end guide part guides smooth cutting-in, and impact force is reduced. The cutter handle assembly is also made of high-strength alloy steel, the surface is subjected to rust-proof treatment, a conical connecting part at one end can be quickly positioned and fixed, and lightening holes in the cutter handle assembly reduce weight and improve dynamic response. The connecting piece is used for fixedly connecting the blade and the handle. The structure is convenient to replace and maintain through modular design, all parts are optimized according to the characteristics of raw rubber, efficient, accurate and safe cutting is achieved, the problem of a traditional cutter in raw rubber cutting is effectively solved, the production efficiency and the cutting quality are improved, and good engineering feasibility and economical efficiency are achieved.
Owner:INAKI TECH (CHENZHOU) CO LTD
Surface ion nitriding TiAl alloy and preparation method thereof
The invention discloses a surface ion nitriding TiAl alloy and a preparation method thereof, and belongs to the field of metal material surface hardening treatment.The preparation method comprises the steps that the TiAl alloy is polished and cleaned; the cleaned TiAl alloy is subjected to ion bombardment in the hydrogen atmosphere; the TiAl alloy subjected to ion bombardment is subjected to ion nitriding in the nitrogen atmosphere; and the TiAl alloy subjected to ion nitriding is cooled to 100 DEG C or below along with the furnace and discharged out of the furnace, and the TiAl alloy subjected to surface ion nitriding is obtained. According to the method, the surface of the TiAl alloy is bombarded by adopting high-energy ions before nitriding, impurities such as an oxidation film and oil dirt on the surface of a workpiece can be removed at the same time, the problem that the oxidation film hinders nitrogen permeation in the nitriding process is avoided, additional pretreatment is not needed, and the overall period is shortened; by optimizing the process parameters of ion nitriding, the time-consuming steps of slowly decomposing nitrogen atoms by depending on gases such as ammonia gas in atmosphere nitriding and then passively diffusing the nitrogen atoms are omitted, and the nitriding efficiency is greatly improved.
Owner:AVIC BEIJING INST OF AERONAUTICAL MATERIALS
Method for producing a water-hydraulic machine
A method for producing a water-hydraulic machine having a first member (1) and a second member (2) in sliding contact with a contact surface (3) of the first member (1), wherein the second member (2) comprises a surface made of a friction reducing plastic material and the contact surface (3) is a metallic surface, is disclosed. The machine should have a low risk of damages. To this end, the method includes the steps of using a first member (1) comprising a first part (4) having the contact surface (3) and a second part (5), using a high temperature hardening process at a temperature of at least 1000° C. to give a deep surface hardening of the contact surface (3) of the first part (4), machining of the first part (4) to the desired geometry, assembling the first part (4) and the second part (5) to form the first member.
Owner:DANFOSS AS
Assembly of welded parts
An assembly consisting of two parts welded together, of which a first part is made of a cast material and a second part is made of case-hardened steel, the parts being rotatable about a rotation axis A, at least one of the two parts being machined on a respective flange surface (4; 5) such that when the two parts are brought together at flange surfaces (4, 5), an intermediate, circumferential weld groove (9; 16; 17) is defined, into which an austenitic melt is introduced, bonding the two parts, the weld groove (9; 16; 17) being designed asymmetrically between the parts in that material is removed only from one flange surface (4) of the second part or in that material is removed from the second part in a width direction of the weld groove (9;17) more material is removed from the flange surface (4) than from a flange surface (5) of the first part, wherein further in an axial staggered manner along the axis of rotation A and after the welding groove (9; 16; 17) a degassing chamber (19) is provided, characterized in that in a further axial staggered manner along the axis of rotation A and after the degassing chamber (19) a clearance (20) is provided.;
Owner:ZF FRIEDRICHSHAFEN AG
spiral compressor
Owner:MITSUBISHI HEAVY IND THERMAL SYST
Method for manufacturing a machine bed for a lathe
The invention relates to a method for manufacturing a machine bed for a lathe comprising the following steps: a) manufacturing an elongated machine bed body (1) from cast iron, wherein the machine bed body (1) has a bottom surface for support on a floor and an opposite top surface, wherein two opposing legs, namely a first leg (2) and a second leg (3), are provided on the top surface in the cross-section extending transversely to the longitudinal direction; b) manufacturing bores (4, 5) in a first (6) and a second leg top surface (12), wherein the bores (4, 5) are oriented approximately perpendicular to the first (6) and second leg top surface (12); c) machining the first leg top surface (6) of the first leg (2) and the second leg top surface (12) of the second leg (3) so that flat leg top surfaces (6, 12) are formed.d) Providing a first guide rail (9) and / or a second guide rail (15), e) Securing the first guide rail (9) by means of first threaded bolts (10) guided into the first holes (4) and securing the second guide rail (15) by means of second threaded bolts (16) guided into the second holes (5), f) Surface hardening of the first (9) and second guide rails (15) in the state attached to the machine bed base (1).
Owner:GDW WERKZEUGMASCH
Cemented carbide insert with eta-phase core
A method of treating a cemented carbide insert for rock drilling and mineral cutting is provided. The insert includes a core of cemented carbide and a surface zone of cemented carbide, wherein the core further contains eta-phase and the surface zone is free of eta-phase. The mining insert is subjected to a surface hardening process, wherein the surface hardening process is executed at an elevated temperature of or above 50° C.
Owner:SANDVIK MINING & CONSTR TOOLS AB
Surface hardening of Group IV metals
A method for case-hardening a group IV metal or a group IV metal alloy, and a component hardened by this method are provided. [Solution] The method comprises the steps of: preparing a workpiece of a group IV metal or a group IV metal alloy, wherein the workpiece is in its final shape; nitriding the workpiece in a nitriding atmosphere containing NH as the nitride species at a first temperature of 450°C to 750°C for a nitriding time of at least 16 hours to form a hydrogen-containing diffusion zone; and a second temperature up to 750°C and up to 10 -4 The method includes removing hydrogen from a hydrogen-containing diffusion zone over a hydrogen removal time of at least 4 hours at a partial pressure of H2 in mbar to form a hydrogen-deficient diffusion zone. This method and its components are useful for implants, particularly dental implants.
Owner:ELOS MEDTECH PINOL AS
Method and system for predicting thickness of hardened layer on surface of roller of belt conveyor
The invention relates to the technical field of metal plate production and manufacturing, in particular to a belt conveyor roller surface hardened layer thickness prediction method and system, and the method comprises the steps: obtaining roller surface related parameter data, and constructing a parameter data set; extracting feature information related to the thickness change of the hardened layer, and performing fusion processing on the feature information to obtain a feature data set; based on the fused data, establishing a hardened layer thickness prediction model, and outputting the predicted thickness of the hardened layer; dynamically adjusting parameters of the hardened layer thickness prediction model according to the real-time parameter data, and obtaining a preliminary prediction result based on the adjusted model; and optimizing the preliminary prediction result through a physical driving model and a real-time data feedback mechanism to generate a final hardened layer thickness prediction result. Through the method, the problems of low efficiency, poor real-time performance and low data utilization rate of a traditional method are effectively solved, the hardened layer change is effectively predicted, the maintenance plan is optimized, the equipment operation risk is reduced, and the safety and stability of a production line are ensured.
Owner:CHANGZHOU DRIVING TRANSPORTATION MACHINERY