171 results about "Electrospark deposition" patented technology

Methods are provided for repairing a degraded section of a turbine blade, the turbine blade comprising a base material. In one embodiment, and by way of example only, the method includes the step of electro-spark depositing a first material on the turbine blade degraded section to form an intermediate layer thereon, the first material comprising a material that is substantially similar to the base material. Next, a second material is laser welded onto the intermediate layer to form a repaired section. This invention combines the low-heat input of electro-spark deposition with the high welding quality and high deposition rate of laser powder fusion welding.

The invention discloses an electrospark hardening method of the surface of a metal roll and relates to a material surface hardening technology. The invention takes a cast steel roll as a deposition object, selects a ceramic hard alloy WC-Co electrode and carries out deposition processing under the atmosphere of argon protection. The technical parameters are as follows: the output power is 500 to 4000W, the output voltage is 60 to 180V, the discharge frequency is 1000 to 2000HZ, the deposition rate is 1 to 5min / cm and the flow rate of argon as protective gas is set to be 5 to 15L / min. Compared with the techniques of hot spraying, plasma cladding, vacuum sintering and the like, the electrospark hardening method has simple equipment needed and easy operation, does not need to carry out preheating to the work before deposition, does not need annealing treatment after deposition, does not generate hot damage to the surface of the metal roll and can carry out deposition repeatedly. The electrospark deposition layer after being treated forms a nano-micron fine crystalline structure, and the fine particles are distributed in a depositing layer in a disperse mode; the microhardness, wear resistance and high-temperature oxidizability of the depositing layer are greatly improved, thus prolonging the service life of the roll.

A microarc build-up welding technology for repairing the damage on rotor's axle neck of electric turbogenerator includes such steps as removing oily dirt, trimming the damaged position, microarc build-up welding with consumable electrode, primary grinding, fine grinding, and polishing.

The invention relates to a device integrating ultrasound assisted electrospark deposition repair and ultrasonic polishing and a method thereof. The device comprises a gas feeding device, a power source and a control box (34), a connection (35), an electrode assembly (37) and a workpiece clamp head (39). By using the combination of the electrospark deposition technique and the ultrasonic mechanical vibration rubbing effect, the repair of the surface defect of a mould can be realized, and the surface of the mould can be mechanically polished by using the ultrasonic vibration energy after the repair is completed. In the invention, the electrospark deposition technique and the ultrasonic polishing technology are comprehensively utilized, so that the repair cost is low while repair precision is high. The combination processing can not only repair the invalid surface material of the mould with high efficiency, but also suit the occasions when major repair equipment is not available. The method for integrating ultrasound assisted electrospark deposition repair and ultrasonic polishing has the advantages of simple operation, convenience and practicality.

The invention relates to a method for enhancing blade surface of a metal hydraulic turbine runner by combining electrical sparkle deposition and plasma cladding. The method can be used for effectively solving the problems of poor surface hardness, wear resistance, corrosion resistance, shock resistance and the like of a blade of the hydraulic turbine runner and prolonging of the service life of the metal hydraulic turbine runner. The method comprises the following steps: cladding the blade surface of the hydraulic turbine runner with alloy powder by using inoxidizability plasma beams so as to form an alloy coating, and then depositing WC (Wolfram Carbide) ceramic hard alloy by using electrical sparkles on the basis of the plasma cladding coating so as to form an electrical sparkle deposition and plasma cladding combined composite coating. The method is simple and practicable; the formed electrical sparkle deposition and plasma cladding combined composite coating is firmly bonded with a matrix and is large in thickness; a bade is high in hardness, good in compactness and wear-resisting property and long in service life; the composite coating gives play to the advantages of low cost, good wear-resistant anti-corrosion performance, high hardness and strength and excellent wear resistance of iron-nickel alloy.

The invention relates the method for electric spark deposition treatment on the copper or copper alloy surface. The method comprises the following steps: using copper or copper alloy as raw material, and using electric spark device to carry out deposition treatment, at the protection of argon gas, argon gas and helium. The output power is 400-1300W, the transmission voltage is 60-80V, the discharge frequency is 100-700Hz, the protection gas flow is 18-30L / min, and the deposition time is 3-15 min. The invention has not many complex devices as vapor deposition and vacuum sintering; the invention can deposit reiteratively, and has simple operation; the method has narrow heat-affected zone or no heat-affected zone; the method has not preheating before deposition and annealing treatment after deposition.

An injection mold for semi-solidified Fe alloy includes a scalping gate for eliminating surface oxide film of a semi-solidified Fe alloy injected into the mold cavity from a pressure chamber. The scalping gate is arranged between the pressure clamber and a runner that is in communication with the mold cavity. The mold halves and the scalping gate are each formed of a copper alloy having a thermal conductivity of not less than 120 W / (m.K) and a hardness of not less than 180 HB. The mold halves and the scalping gate each has a cermet layer consisting essentially of at least one member selected from a group consisting of Co, Cu, Cr and Ni. The cermet layer is formed by electro-spark deposition, via an intermediate layer of Ni alloy also formed by electro-spark deposition.

The invention discloses a composite reinforcement method for TiC / TiB2 base metal ceramic on the surface of a roller, and belongs to the technical field of metallurgical machinery. The composite reinforcement method comprises the processing steps of: cleaning the roller; performing plasma spraying of nickel base alloy or overlaying the nickel base alloy on the cleaned roller; turning the roller according to requirements of a steel groove rolling system to meet the technical requirements; and cladding on the surface of the roller by using an electric spark deposition process to form the TiB2 / TiC base metal ceramic by using a TiB2 / TiC base metal ceramic electrode. The composite reinforcement method has the advantages that: the roller performance is greatly improved and fixed-roller-diameter rolling can be guaranteed, so that the process stability in a rolling process is guaranteed, meanwhile, the service life of the roller is greatly prolonged, the roller consumption is reduced, and the steel rolling operability and the steel surface quality are improved. Compared with processes such as overlaying and laser, the composite reinforcement method can be used for repairing of primary and intermediate rolling roller, and most importantly, the composite reinforcement method can be directly used for surface treatment of the roller of a finishing mill group, so that remanufacturing of thesurface of the roller is realized.

The invention relates to an electrode preparation process for depositing a diamond abrasive tool with electric sparks, comprising the steps of: dipping a diamond abrasive material into anhydrous ethanol for ultrasonic cleaning; then dipping a diamond in industrial aluminum sol for 5 min; fishing out the abrasive material with a copper wire mesh; repeating the steps twice after the abrasive material is dried; placing surface-modified diamond into a box-type furnace; raising temperature to 700 DEG C at a temperature rise rate of 5 DEG C per min; keeping warm for 1 h, cooling together with the furnace to obtain the diamond abrasive material with an Al2O3 coating coated on the surface; uniformly mixing the diamond abrasive material, cobalt powder, copper powder, tungsten carbide powder and silver powder in the mass ratio of 25: 20: 40: 10: 5 under ball milling conditions; adding a mixed electrode raw material to a cylindrical graphite die, wherein the inner bore diameter of the die is 20mm; sintering the cylindrical graphite die on an SM80 sintering machine, wherein the pressure at two ends of the die is 15KN, the voltage is 10V; keeping warm for 5 min when the temperature reaches 800 DEG C, stopping heating the die; and cooling naturally to obtain an electrode material. The electrode material structure prepared by utilizing the process has favorable consistency and high diamond abrasive material content; and the diamond abrasive tool with uniform structure and high abrasive material concentration can be deposited by utilizing the electrode.

The invention provides a numerical control electric spark deposition knife handle, and relates to a knife handle, in particular to the numerical control electric spark deposition knife handle. The numerical control electric spark deposition knife handle aims at solving the problem that an existing manual electric spark deposition is incapable of achieving an accurate control on apparent characteristics, a coating structure and a coating performance of a settled layer. The device comprises a knife handle body, an insulating part, a bearing, a sleeve, a drill chuck and an electrode. The insulating part comprises a handle part, a baffle ring, a bearing installing part and a thread part. The upper end of the knife handle body is connected with a blind rivet. The handle part is arranged inside the lower end of the knife handle body. The knife handle body is provided with set screws. The knife handle body is fixedly connected with the handle part through the set screws. An inner ring of the bearing is arranged on the bearing installing part. The thread part is connected with the sleeve in a threaded mode, and the bearing is fixed between the sleeve and the baffle ring. The lower end of the sleeve is provided with the drill chuck. The lower end of the drill chuck is provided with the electrode. The numerical control electric spark deposition knife handle is achieved.

The invention discloses an automatic electro-spark deposition system. The electro-spark deposition process comprises the following steps: (1) in an XY axis motion controller, the motion trajectory of the deposition surface of a workpiece is set; (2) a deposition gun is connected with a z-axis motion mechanism, a z-axis pressure feedback controller is connected with a pressure sensor while the pressure value of the deposition process is set by the z-axis pressure feedback controller; (3) an electro-spark deposition device is connected with an inert protective atmosphere, the parameters of the power supply such as voltage, discharge capacitance and current frequency are set; and (4) deposition is performed; according to the preset pressure value and the detected pressure signals, the z-axis pressure feedback controller controls the deposition gun to move up and down through the z-axis motion mechanism, the pressure is controlled into the preset pressure range, and the stable electro-spark deposition process can be realized. By adopting the automatic electro-spark deposition system, the accurate control of the electrode workpiece extrusion force can be realized, the detection, display and feedback control of the extrusion force can be realized, 0-10N of stable extrusion force output can be ensured and equipment can be provided for the electro-spark deposition technology.

The invention discloses a reaction electric spark deposition preparing method of titanium nitride metal base ceramic coating, which comprises the following steps: adopting titanium and alloy as rotary electrode protected by nitrogen gas; utilizing electric spark deposition technology and home position synthesized technology to prepare titanium nitride metal base ceramic coating. The invention displays smelting connection with metal base, whose connection strength and coating hardness are high.

The invention discloses a preparation method of an amorphous nanocrystalline coating based on electric-spark deposition. The amorphous nanocrystalline coating comprises the following elements of chemical components in percentages by weight: 4%-8.82% of B, 6%-72% of Mo, 0-15% of Cr, 0-15% of Ni, 0-15% of Mn, 0-15% of V and the balance of Fe. The preparation method comprises the following steps: firstly adopting a powder metallurgy technology to prepare and obtain an electrode material of Fe2B-Mo2FeB2-based metal ceramic or Mo2FeB2-based metal ceramic, then carrying out electric-spark deposition on the electrode material, and carrying out protection by using inert gas with the flow rate of 0.01-10 L / min, wherein the technological parameters of deposition are as follows: the output power is 2000-8000 W, the output voltage is 100-300 V, and the deposition rate is 0.5-10 min / cm2. According to the preparation method, the efficiency of the electric-spark deposition is obviously improved, and the relative content of amorphous nanocrystalline in the coating is conveniently and simply controlled.

The invention relates to the field of metal surface modification and provides a preparation technology of an antioxidant and conductive spinel coating. The method comprises the follow steps: smelting after Co metal powder and Mn metal powder are uniformly mixed, then carrying out annealing to well smelt CoMn alloy, and cleaning up the well smelt CoMn alloy treated through annealing as deposit electrode material for reservation; taking a prepared deposit electrode as a cathode in the process of sedimentation, taking metal as the material of a basal body, under the protection of inert gas, and carrying out electro- spark deposition on the surface of the metal, that is a CoMn alloy coating layer is produced; and carrying out heating and pre-oxidation on the prepared CoMn alloy coating layer in air atmosphere, that is a CoMn spinel coating is formed on the surface of the CoMn alloy coating layer. According to the invention, alloy atomic ratio can be accurately controlled, the conducting material of the electrode is oozed into the surface of a metal piece to form the alloy layer, the prepared coating and the basal body have the characteristic of metallurgical bonding, the bonding force is strong, and the coating forms a spinel which meets the protecting requirements of an SOFC (Solid Oxide Fuel Cell) metallic union body.

The invention discloses a metal microstructure direct forming method based on electric spark discharging deposition additive manufacturing. In the method, the layered manufacturing of a fast prototype technology and the advantages that the electric spark discharging deposition processing equipment is simple and the energy is easy to control are combined, a novel electric spark discharging deposition processing method facing the metal microstructure manufacturing is put forward, the processing way and the technological characteristic of the electric spark deposition processing are fully used, the inter-electrode discharging condition is controlled, the electrode high consumption of a tool and the deposited material corrosion removing are realized, the technical characteristics of the single discharging micro deposition and multiple discharging accumulation and forming are used, the deposition processing on a microstructure two-dimension layer is realized, and the two-dimension layer accumulation is used for forming a three-dimension micro component body. The metal microstructure electric spark discharging deposition processing technology is realized, the flexibility in the manufacturing process of the micro metal three-dimension component and the complexity of the processed component are improved, and the method provides a novel technical means for modern manufacturing.

The surface of a gas turbine blade is machined with a material-removing tool and simultaneously, an anti-oxidation coating is deposited on the surface using eletrospark deposition.

An electrospark deposition electrode and an associated method for depositing coatings using the electrode are provided. The electrode includes a powder of a first metal and a powder of a second metal. The second metal is a braze alloy including nickel, the second metal having a lower melting point than the first metal. The powder of the first metal and the powder of the second metal are sintered together to form the electrode so that the powders are comingled but not combined within the electrode. The method includes depositing a layer of the first metal onto the substrate using an electrospark deposition process.

The invention provides a method and equipment for preparing a multi-layer composite material and a structural damping composite material prepared by adopting the method and the equipment. The preparation process comprises the following steps: 1. by taking a matrix layer as a cathode and taking a first electrode used as a source of a first structural layer as an anode, depositing the first electrode onto the surface of the matrix layer and forming a first structural layer by utilizing electrical discharge deposition; and 2. by taking a second electrode used as a source of a second structural layer as an anode, depositing the second electrode onto the surface of the first structural layer and forming a second structural layer by utilizing electric discharge deposition. When the first structural layer and the second structural layer are respectively a first damping layer and a second damping layer formed by damping materials, the obtained multi-layer composite material is a structural damping composite material. Control mechanisms of the equipment used by the method include a mechanism for controlling electrode feed movement and a mechanism for controlling an electrode clamping part to clamp or replace the electrode.

The invention relates to a method for strengthening the surface of a runner blade of a metal hydraulic turbine through combination of electro-sparking deposition and laser cladding. By performing combined treatment of electro-sparking deposition and laser cladding on the runner blade of the metal hydraulic turbine, the problems that the performances including hardness, wear resistance, corrosion resistance and impact resistance of the surface of the runner blade of the hydraulic turbine are low and the service life of a runner of the metal hydraulic turbine is short can be effectively solved. The method comprises the steps of cladding iron-nickel base alloy powder on the surface of the runner blade of the hydraulic turbine by using laser beams to form a hard alloy coating layer; then, performing electro-sparking deposition on a WC (wolfram carbine) ceramic hard alloy on the basis of the laser cladding coating layer to form a composite coating layer with combination of electro-sparking deposition and laser cladding. The method disclosed by the invention is simple, high in production efficiency and good in product quality, and the problem of treating the surface of the blade of the hydraulic turbine is effectively solved, so that the performances including hardness, wear resistance, corrosion resistance and impact resistance of the surface of the runner blade of the hydraulic turbine are improved, the service life of the runner of the metal hydraulic turbine is prolonged, and great economic and social benefits are achieved.

The invention discloses a laser 3D printing and manufacturing method of an electric spark electrode. The laser 3D printing and manufacturing method comprises the following steps: (1) machining and flattening a metal base plate; (2) setting a powder scraping amount of a scraper; (3) cutting a 3D design drawing of the electrode into multiple layers of slice layer structures in the height direction;(4) adjusting printing parameters of a laser device; (5) dividing each slice layer of the electrode into multiple regions, and controlling laser beams to perform overlapping scanning fusion covering in the regions covered with powder; (6) performing scanning fusion covering on the first layer of the electrode on the metal base plate, then repeatedly downwards moving the metal base plate by one slice layer thickness, and performing scanning fusion covering on the next layer of the electrode till the scanning fusion covering of the whole electrode is completed; (7) separating the metal base plate from the formed electrode to complete laser 3D printing and manufacturing of the electric spark electrode. According to the laser 3D printing and manufacturing method of the electric spark electrode, by use of a laser 3D printing technology, a metal-based material with a high content of ceramic components is directly subjected to 3D printing to form the electric spark electrode with a complicated structure, so that no molds are needed; the working procedures are simple, the production efficiency is high, and the cost is low; the manufactured electrode can meet requirements of electric sparkmachining and electric spark deposition technologies.

The invention provides a self-lubricating coated cutting tool prepared on the basis of electric spark deposition and a preparation method thereof and belongs to the technical field of manufacturing of a mechanical cutting tool. A base material of the cutting tool is high-speed steel or hard alloy; a soft metal microcapillary electrode or an electrode of which the end face is provided with a microstructure is adopted; the microcapillary electrode or the microstructure of the electrode is full filled with a solid lubricant and then a self-lubricating coating is prepared on the surface of the cutting tool by adopting electric spark deposition. According to the invention, by utilizing the electric spark deposition technology, the cutting tool not only has a self-lubricating effect, but also has high bonding strength in the dry cutting process; due to the result, on one hand, a friction lubricating state of the cutting tool in the dry cutting process can be greatly improved, friction can be reduced, adhesion is prevented, a cutting force and a cutting temperature are reduced and wear of the cutting tool is reduced, and on the other hand, service life of the cutting tool can be prolonged. The self-lubricating coated cutting tool can be widely applied to dry cutting and cutting machining of materials difficult to machine.

Hybrid coating systems include an electrospark deposition device having an electrode that deposits a coating on a substrate and a laser that produces a laser beam directed towards at least a portion of the coating as the coating is deposited on the substrate.

The invention relates to a capacitor charge-discharge pulse digital control type electric spark depositing surfacing welding power supply which belongs to precise repairing and surface strengthening technologies in the regeneration manufacturing field; and the power supply comprises a microprocessor, an alternating-current voltage regulating circuit, a rectifying and filtering circuit, a chargingand driving circuit, a charging voltage detection circuit, a discharging and driving circuit and the like. The power supply can be used for carrying out the stepless regulation on the voltage of a discharging capacitor, also can realize the stepless regulation of discharging energy and discharging frequency and can meet the requirements of different technological conditions; and when the chargingpulse and the discharging pulse of the capacitor are under the control of the microcomputer, the charging process and the discharging process of the capacitor are carried out alternatively so that the charge-discharge of the capacitor still can be ensured and the electric sparks are generated even when electrodes and workpieces are short-circuited, and therefore the depositing surfacing welding effect of the power supply is improved.

The invention discloses a multifunctional integrated manufacturing system based on discharge machining. The multifunctional integrated manufacturing system comprises a robot, a motion control unit, amultifunctional composite discharge power supply, a working medium supply and recovery unit, a wire feeding device, a tool head quick-change clamping unit, a discharge machining tool head, a welding tool head, a detection tool head and a workbench. According to the multifunctional integrated manufacturing system, the robot serves as an executing mechanism, and comprises four functions of a discharge additive manufacturing including an electric arc additive forming and a fine electric spark deposition forming, a discharge reduction machining including an electric arc high-efficiency machining and an electric spark precision machining process, an part connection based on electric arc surfacing and an on-line detection function based on optical scanning and ultrasonic flaw detection. According to the multifunctional integrated manufacturing system based on discharge machining, the integration degree is high, the machining and manufacturing of difficult-to-machine materials and micro-sizedparts are covered, and the high-efficiency and precise machining characteristics are achieved. The multifunctional integrated manufacturing system can be implemented in various media, gets rid of limitation of environment, is wide in application range, and has a very strong application prospect in the extreme environments such as outer space and deep sea.

The invention discloses an automatic double-Z-axis electric spark deposition device and method. A first alternating-current servo motor, a second alternating-current servo motor and a fourth alternating-current servo motor in the X-axis direction, the Y-axis direction and the Z1-axis direction are controlled to move so as to drive an electrode to move to a machining starting point of a workpiece surface; when a third alternating-current servo motor runs, a Z2-axis ram descends so as to ensure that the squeezing force of a rotary deposition gun on the workpiece is equal to a preset value; the first, second and fourth alternating-current servo motors run, and a movement orbit of the workpiece surface is formed by rotating the rotary deposition gun; the height of the electrode is adjusted according to a real squeezing force value measured by a force transducer, wherein when the squeezing force is greater than the upper difference of the preset value, the third alternating-current servo motor is reversed to drive the Z2-axis ram to ascend so as to drive the rotary deposition gun and the electrode to ascend, and when the squeezing force is smaller than the lower difference of the preset value, the third alternating-current servo motor rotates forward to drive the Z2-axis ram to descend; and the elevation movement in the Z2-axis direction is only related to the squeezing force, a deposition layer is more continuous, and the thickness of the deposition layer is more uniform.

The invention relates to a method for strengthening the surface of a metal turbine runner blade through combination of electric spark deposition and welding. By means of the method, hardness, wear resistance, corrosion resistance, impact resistance and other performance of the surface of the turbine runner blade are effectively achieved, and the service life of a metal turbine runner is prolonged. The method includes the steps of processing the turbine runner to remove greasy dirt, rusty spots and oxide; welding a martensitic stainless steel welding wire to the surface of the turbine runner blade through a consumable electrode gas protection welding device; conducting surface polishing and grinding on the welding layer through an abrasive piece; connecting a clamp with the turbine runner serving as the cathode through an electric spark deposition device, wherein the clamp is connected with a ground wire; depositing a submicron WC-Co ceramic hard alloy electrode stick on a chuck of a deposition gun as the anode; conducting electric spark deposition on the turbine runner blade so that a compound coating and the turbine runner blade can be combined in a metallurgical mode. The method is simple and easy to operate, the thickness of the coating is large, the surface of the blade is high in hardness, good in compactness and good in wear resistance, the service life is long, and cost is low.

The invention relates to a multi-pulse digital control type electrospark deposition surfacing power supply, and belongs to precise repairing and surface strengthening technologies in the field of regeneration and manufacturing. The power supply mainly comprises a high-voltage pulse circuit, a low-voltage arc stabilizing circuit and a negative-pressure pulse circuit. In the deposition process, the power supply can output high-voltage pulses to be used for the breakdown of a discharge circuit, and meanwhile outputs low-voltage pulses for arc stabilizing, namely micro arcs in a certain time are formed; transition from electrode materials to workpieces is facilitated, and deposition surfacing efficiency of the power supply is improved. The power supply can output negative-pressure pulses, formed electrosparks can remove high spots deposited on the workpieces, and uniform and dense increasing of a deposition layer is facilitated. By means of high-voltage pulse output and low-voltage pulse output, deposition efficiency can be improved, the high deposition spots on the deposition layer can be removed through the negative-pressure pulses, uniform increasing of the deposition layer is facilitated, and deposition compactness is improved.

The surface of a gas turbine blade is machined with a material-removing tool and simultaneously, an anti-oxidation coating is deposited on the surface using eletrospark deposition.

The invention provides an automatic control device and an automatic control method of electric spark deposition build-up welding contact force. The automatic control device comprises an execution mechanism used for driving an electrode tip to make contact with a base body, an induction mechanism arranged between the execution mechanism and the electrode tip, and a control mechanism which is electrically connected with the induction mechanism and is in control connection with the execution mechanism. The execution mechanism comprises a cross-shaped sliding table. The plane where the cross-shaped sliding table is located is perpendicular to the base body. The cross-shaped sliding table is connected with an angle adjusting unit in a driving manner, wherein the angle adjusting unit is used forclamping the electrode tip. The induction mechanism comprises a pull pressure sensor fixedly arranged between the cross-shaped sliding table and the angle adjusting unit. The control mechanism comprises a single-chip microcomputer which is electrically connected with the pull pressure sensor. The single-chip microcomputer is in control connection with the cross-shaped sliding table through an output drive interface. The single-chip microcomputer is in communicating connection with an upper computer through a communicating interface. The automatic control device can automatically control the contact force between the moving electrode tip and the fixed base body in real time, and the deviation of the deposition position caused by consumption of the electrode tip can be compensated automatically.