169 results about "Electrospark deposition" patented technology

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.

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 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 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 discloses an impact-resistant high-hardness wear-resistant ball which comprises the following raw materials in parts by weight: 100 parts of waste steel, 18-25 parts of ferrochromium, 1-1.5 parts of ferromolybdenum, 1-1.3 parts of ferrovanadium, 0.1-0.3 part of ferromanganese, 0.2-0.6 part of ferrosilicon and 2-5 parts of zinc. In a preparation process of the impact-resistant high-hardness wear-resistant ball, the surface of the wear-resistant ball is modified by adopting plasma cladding and electric spark deposition technologies; plasma cladding process parameters comprise non-transferred arc voltage, non-transferred arc current, transferred arc voltage, transferred arc current, ionized gas stream, powder feeding gas flow, protection gas flow, cladding speed, welding gun swing range and spraying distance; the electric spark deposition process parameters comprise argon gas flow, deposition voltage, deposition frequency, deposition power, deposition time and rotary deposition gun speed. The wear-resistant ball is excellent in impact resistance, corrosion resistance, hardness, heat resistance and wear resistance.

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 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 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 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.