57results about How to "Reduction of stray corrosion" patented technology

The invention relates to a micro-hole group electrolytic machining method and a bipolar electrode thereof, which adopts a bipolar electrode and belongs to the technical field of electrolytic machining. The invention is characterized in that the method includes the following steps: (a) manufacturing a bipolar electrode (1) provided with a through hole group structure and consists of an auxiliary anode (7), an insulated layer (6) and a tool cathode (5); (b) tightly binding the auxiliary anode (7) with a workpiece anode (2) on the bipolar electrode; (c) connecting the workpiece anode (2) and the tool cathode (5) with the anode and the cathode of the electrical source (3) respectively; (d) spraying electrolyte (4) on the surface of the tool cathode (5) in the way that the electrolyte runs through the through hole group of the bipolar electrode (1) to reach the surface of the workpiece anode (2); (e) connecting the electrical source (3) for electrolytic machining. The invention can significantly improve the localization and micro-scale processing capacity of electrolytic machining.

An electrolysis technology for machining fine (0.2 mm) slit or seam features that the fine metal wire is wound on particular frame to form an electrode and the liquid is fastly flushed in the radial and axial directions of electrode wire to ensure high stability and uniformity of flow field. Its apparatus is composed of liquid tank, pump, filter, overflow valve, ball valve, working cavity, temp controller, heater, controller, power supply driver, and machining unit. Its advantage is high precision (+/-0.02 mm).

The invention discloses a wire electrode array structure preparation method for micro-electrochemical machining. The wire electrode array structure preparation method includes the steps of 1), pretreating a metal base; 2), manufacturing a graphical masking film; 3), subjecting the masking film to profound electrolytic corrosion, namely taking the metal base with the graphical surface as a positive electrode for electrolytic machining to obtain a tool negative electrode in a wire electrode template machined and manufactured in the profound electrolytic corrosion, and determining electrolytic corrosion time according to photoresist pattern width and electrolysis current density till to obtain a metal gate line array pattern with the point top; 4), removing back materials, namely removing the back materials corresponding to the manufactured metal gate lines to obtain a wire electrode array integrated with a frame. By means of the method, the metal microstructure array with cross sections different in shapes like square, rectangle and rhombus can be manufactured, so that the metal microstructure array with large depth-to-width ratio, high density and high machining quality can be efficiently realized.

The invention discloses a method and a device for electrolytic machining of massive array tiny pits through a wedge-shaped runner, and belongs to the technical field of electrolytic machining. The method includes processing the surface of a mask plate to enable the surface to fit with the surface of a workpiece anode; fixing a wedge-shaped tool cathode above the mask plate to enable the wedge-shaped runner to be formed between the wedge-shaped tool cathode and the mask plate; connecting the workpiece anode and the wedge-shaped tool cathode with an anode and a cathode of a power source respectively; feeding an electrolyte into the wedge-shaped runner, wherein the electrolyte reaches the surface of the workpiece anode through penetrating group holes in the mask plate; switching on the power source for electrolytic machining. The runner is arranged to be wedge-shaped, so that electric field intensity and electrolyte flowing speed are enabled to be progressively increased along the direction of the runner, both corrosion strength and speed of a workpiece are enabled to tend to be uniform, and uniformity and machining accuracy of electrolytic machining are improved. A PDMS (polydimethylsiloxane) template is taken as the mask plate, bonding strength of the mask plate and the workpiece anode can be guaranteed, stray corrosion, of the electrolyte, to places around a machining area can be effectively reduced, and locality and uniformity of electrolytic machining can be improved.

The invention relates to a micro-texture radial vibration auxiliary electrolytic machining method for the inner wall of a rotary body of a thin-wall part. The method is characterized in that a tool cathode with a micro-boss texture on the surface and capable of doing radial vibration is connected with a negative electrode of the power supply, the tool cathode is connected with an ultrasonic current generator, a thin-wall rotary body workpiece is connected with a positive electrode of the power supply, and the columnar electrode on the tool cathode is arranged in a linear array mode; an electrolyte enters a reaction area between the tool cathode and the workpiece through a liquid supply pipe; a machine tool spindle drives the tool cathode to horizontally move in the peripheral direction according to a preset trajectory, a certain machining gap is reserved between the workpiece and the columnar electrodes on the tool cathode, the machine tool spindle drives the tool cathode to do autorotation motion, and the tool cathode connected with the ultrasonic current generator is used for constructing an ultrasonic energy field; the electrolyte flowing out at a high speed is sprayed onto theworkpiece to obtain the required machining morphology. The invention further provides an micro-texture radial vibration auxiliary electrolytic machining device for the inner wall of the rotary body ofthe thin-wall part. According to the method and the device, the centering property, the stability, the precision and the efficiency for machining the micro-texture of the inner wall of the rotary body are improved.

The invention provides a slave type array micro pit electrolytic machining method, and belongs to the technical field of electrolytic machining. The method includes the steps that a tool cathode is manufactured and composed of a metal tool and a mask plate provided with a through hole group structure, a workpiece anode and the tool cathode are connected with the positive pole and the negative pole of a power supply respectively, the workpiece anode is immersed in electrolyte, the surface of the tool cathode and the surface of the workpiece anode are tightly attached, and electrolytic machining is carried out after the power supply is turned on; after primary electrolytic machining, the power supply is cut off, the tool cathode is lifted, the electrolyte on the surface of the workpiece anode is replaced, then the surface of the tool cathode and the surface of the workpiece anode are tightly attached, and the power supply is turned on for electrolytic machining. The tool cathode is lifted and falls periodically, and electrolytic machining is carried out. Due to the fact that the tool cathode and the workpiece anode are tightly attached, generated bubbles are accumulated on the side wall of a micro pit, stray corrosion around a machining area can be effectively reduced, and locality of electrolytic machining and micro machining are remarkably improved.

The invention provides an electrolytic machining cathode device for freezing protection sleeve material and a processing method, and belongs to the technical field of electrolytic machining. The cathode device is mainly composed of a cathode head, a cathode block, a freezing block and a coolant bag body. In the sleeve material electrolytic machining method, the coolant bag body surrounds the periphery of a protection cavity in the middle of the freezing block, the machined part of the workpiece gradually extends into the protection cavity in the middle of the freezing block, a coolant is fed from the inlet end of the coolant bag body and flows out from the outlet end of the freezing block, and the stray electrolyte in the middle protection cavity of the freezing block is frozen. Accordingto the electrolytic machining cathode device, stray corrosion caused by stray electrolyte on the machined surface of the workpiece is reduced, the taper of the workpiece is reduced, and the surface quality of the workpiece is improved.

The invention relates to a large-distortion blade precise electrolytic machining device and a process method. The device comprises a cathode positioning and clamping device, a workpiece quick-changingdevice and an electrolyte flow guiding device. According to the large-distortion blade precise electrolytic machining device and the process method, a fully-closed electrolytic machining tool clamp is adopted, the cathode design is integrated, and a composite flow guiding segment combined with a metal segment and an insulating segment arranged on a blade basin cathode and a blade rear cathode arecombined, so that a flow field in the machining process is stable; the workpeice space pose is optimized through a particle swarm algorithm, and the optimal feeding angle can be achieved only feedingthe blade basin cathode and the blade rear cathode in an opposite-linear mode, so that the electrolytic forming precision is improved. According to the method, the high-precision of blade space positioning can be ensured; and meanwhile, quick workpiece changing can be realized by means of a quick-change reference element arranged on a fully-closed tool, and one-time clamping can be achieved to complete the integral forming of a blade basin surface, a blade rear surface and inlet and exhaust edges, and the purpose of improving the machining precision and machining efficiency of a blade can beachieved.

The embodiment of the invention provides a precise regulating and controlling device for an electrolytic machining flow field of a closed structure blade. The device comprises an electrolytic machining device used for conducting electrolytic machining on the closed structure blade and an assembling device used for assembling the electrolytic machining device; the electrolytic machining device comprises a blade back cathode provided with a blade back side auxiliary channel, a blade basin cathode provided with a blade basin side auxiliary channel and a main channel in the same direction as the blade back side auxiliary channel and the blade basin side auxiliary channel; and the blade back cathode and the blade basin cathode are structurally symmetrical. According to the precise regulating and controlling device, the blade back side auxiliary channel is arranged on the blade back cathode, the blade basin side auxiliary channel is arranged on the blade basin cathode, after liquid supply on the two sides and the main channel are combined, a certain back pressure effect is achieved on the front section of the flow field of the main channel, the vortex and hole phenomena caused by shock waves of a liquid inlet are eliminated, and furthermore, through the pressure adjusting effect of auxiliary liquid, the stability of the flowing state of the liquid inlet section is effectively improved.

The invention discloses a method for electrolytic machining of a microtexture. The method mainly includes the following steps that S1, a workpiece anode is immersed in electrolytes, and metal particles are laid flatly on the surface of the workpiece anode to form an equivalent thickness metal particle layer; S2, a tool cathode attached with electric insulation cloth is tightly attached to the metal particle layer, and the electric insulation cloth is disposed between the tool cathode and the metal particle layer; S3, the workpiece anode is connected with the positive pole of a power supply, and the tool cathode is connected with the negative pole of the power supply; S4, the electrolytes are supplied into the metal particle layer through an electrolyte circulating system and flow circularly in a machining gap formed between the workpiece anode and the tool cathode; and S5, the power supply is switched on for electrolytic machining, when machining requirements are met, the power supplyis disconnected, electrolyte supply stops, the workpiece anode is taken out, and machining is completed. The method has the advantages that mask preparation is simple, the application range is wide, and microtextures with uniform sizes and good profiles can be prepared on planes and curved surfaces.

The invention discloses an integral impeller trepanning electrolytic machining process and device with a gas-assisted protection function, and belongs to the field of electrolytic machining. The upper part of the device is provided with a cylindrical cathode seat which is in clamping connection with a main shaft, and the bottom of the cylindrical cathode seat is provided with a pin hole so as to realize the positioning of a cathode; a vent hole is formed in the middle of the device and used for conducting gas-assisted insulation on a machined blade and a blade to be machined. An insulation sealing device is arranged on the lower portion of the device, and the insulation sealing device and the front blade insulation sleeve and the rear blade insulation sleeve inside the device form a closed machining area to achieve closing of an electrolytic machining flow field. In the machining process, the blade sleeved with the blade insulation sleeve is always in the gas auxiliary insulation state, and the stray corrosion degree of the machined blade is effectively reduced. The method solves the problems that the machined blade is subjected to stray corrosion and the flow field open type electrolyte remains in a non-machining area during the trepanning electrolytic machining of the uniform-section blade type integral impeller, and is beneficial to improving the machining precision of the blade and enhancing the stability of the machining process.

The invention relates to a conical electrolyte groove and a micro electrolytic wire cutting and piercing processing method, and belongs to the field of micro electrolytic processing. The micro electrolytic wire cutting and piercing processing method is characterized in that the conical electrolyte groove (7) is used. The upper end of the conical electrolyte groove is provided with a cylindrical groove body (7-1), and the lower end of the conical electrolyte groove is provided with a conical groove body (7-2); and a liquid inlet (22) is formed in the side surface of the upper cylindrical groovebody, and a liquid outlet (23) is formed in the bottom of the lower conical groove body. The cylindrical groove body (7-1) part makes an electrolyte flowing in a direct current mode move rotatably, and products around a processing channel are discharged fully; and the conical groove body (7-2) part makes a flowing fluid generate a flow rate in the vertical direction, the processed products in thechannel are further taken away, and the effect of electrolysis is enhanced. The conical electrolyte groove and the micro electrolytic wire cutting and piercing processing method can be applied to micro electrolytic wire cutting and piercing processing, the processing efficiency is high, and the processing quality is good.