CN111805025A - Rod-plate combined type electrolytic machining cathode system and machining method thereof - Google Patents
Rod-plate combined type electrolytic machining cathode system and machining method thereof Download PDFInfo
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- CN111805025A CN111805025A CN202010581723.0A CN202010581723A CN111805025A CN 111805025 A CN111805025 A CN 111805025A CN 202010581723 A CN202010581723 A CN 202010581723A CN 111805025 A CN111805025 A CN 111805025A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
- B23H3/04—Electrodes specially adapted therefor or their manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H11/00—Auxiliary apparatus or details, not otherwise provided for
Abstract
The invention relates to a bar-plate combined type electrolytic machining cathode system and a machining method thereof, and belongs to the field of electrolytic machining. The cathode system mainly comprises: the rod-plate combined cathode module, the fastening module, the flow equalizing module and the liquid inlet module. The system is characterized in that: the cathode module is divided into two parts of a cathode outer frame and a rod plate combined cathode array, a plurality of groups of corrosion-resistant metal rod matrixes with different specifications are tightly distributed in the cathode outer frame, and adjacent metal rod matrixes are separated by metal plates made of the same material; the shapes of the liquid outlet seams formed by the metal bar matrixes with different specifications are different, and the shapes and the distribution of the cathode liquid outlet seams can be greatly and quickly adjusted by adjusting the specifications of the metal bar matrixes and the positions of the metal plates. The invention is beneficial to improving the uniformity of the flow field in the processing gap in the electrolytic processing process of the large-area cavity, reduces the optimization cost of the flow field and has important significance for realizing the integral electrolytic processing molding of the large-area cavity.
Description
Technical Field
The invention relates to a bar-plate combined type electrolytic machining cathode system and a machining method thereof, and belongs to the technical field of electrolytic machining.
Background
Electrolytic machining belongs to the field of special machining technology, and is based on the electrochemical anode dissolution principle to remove workpiece materials. In the electrolytic machining process, the tool cathode is fed to the workpiece anode under the control of the numerical control system, and the workpiece anode material is gradually dissolved until the shape and the size of the workpiece anode meet the requirements. The technology has the characteristics of no loss of the cathode of the tool, no cutting stress, no influence of material hardness on the machining characteristics and the like.
When the cavities on the workpiece are machined in an electrolytic mode, in order to improve machining efficiency, the profiling design of the cathode of the tool is usually carried out according to the size, the position and the like of the cavities, the cavities of the workpiece can be machined and formed only by feeding once, and the method is suitable for occasions of mass production. As the area of the processing cavity increases, the problems of flow field uniformity and stability throughout the electrolytic processing region will be further highlighted. This also causes that the primary designed cathode is difficult to meet the requirements, needs to go through the process of simulation, test and optimization many times, and greatly increases the production cost and the design period.
In recent years, experts and scholars have made a series of progress on cavity electrolytic machining, and in a patent "an electrode and a machining method for blisk electrolytic grooving machining" (application No. 200910248600.9, inventor xu zhuhinan baiying pure and the like), a machining mode of indexing, partitioning and dividing steps is proposed, and a cathode is electrolytically machined on different stations, so that a machining flow field is good. In the patent "a whole-process linear flowing flexible protective sleeve material electrolytic machining device and method" (application number CN201610696734.7, inventor zhuang liu ao valley, etc.), a method for realizing linear blade sleeve material machining on the outer side of a workpiece by a linear tool cathode is provided. The method can better realize the electrolytic machining of the small-area cavity by reducing the linear opening. Expert scholars have also conducted some research in increasing the reuse rate of tool cathodes and reducing production costs. For example, in the patent "a tool cathode and clamping method of electrolytic machining heteromorphic cavity" (publication number CN109877403A, inventor yuze liu weichang chang etc.), it is proposed to adopt a combined cathode disk structure, and the cathode head connected on the combined cathode disk is quickly replaced according to the machining requirement, so that the reuse rate of cathode components is improved, the mode of only replacing the cathode head to optimize the flow field is adopted, and the optimization cost is reduced.
The electrochemical machining method provided by the patent takes the small-area cavity as a single-time machining object, and is directly applied to the one-time electrochemical machining of the large-area cavity, so that the uniformity of a flow field is difficult to ensure due to the increase of a machining area; the partition splicing processing mode can ensure the uniformity of a flow field, but has the problems of long processing period, complex process, easy formation of cutter-connecting marks and the like. Therefore, an electrolytic machining device and method with few machining processes, good flow field uniformity and quick and simple cathode adjustment are urgently needed to realize efficient electrolytic machining of a large-area cavity on a workpiece.
Disclosure of Invention
The invention provides a bar plate combined type electrolytic machining cathode system and a machining method thereof, aiming at the problems of poor uniformity of a flow field and difficulty in optimization and adjustment in the electrolytic machining of a large-area cavity, so as to improve the machining efficiency and precision and reduce the optimization cost.
The utility model provides a combined electrolytic machining cathode system of stick board, by preceding after by stick board combination formula cathode module, fastening module, the module and the feed liquor module of flow equalizing constitute its characterized in that in proper order: the rod-plate combined cathode module consists of a cathode outer frame and a rod-plate combined cathode array; the cathode outer frame is subjected to copying design according to the surface to be processed of the workpiece, and the middle part of a processing area is hollowed out; the rod-plate combined cathode array comprises a plurality of corrosion-resistant metal rods; the rod-plate combined cathode array is positioned at the hollow-out position in the middle of the cathode outer frame, and the side end face of the processing end is cut and polished according to the cavity surface of the workpiece; the fastening module consists of a transverse fastening module, a longitudinal fastening module and a fastening bracket and is used for pressing and fixing the metal bar and the metal plate in the bar-plate combined cathode array; the transverse fastening module and the longitudinal fastening module are respectively formed into a wedge-shaped fastening structure by symmetrically combining two right-angle trapezoidal strips, and the right-angle trapezoidal strips are in clearance fit with the inner side of the cathode outer frame; the outer side of the right trapezoid bar is tightly pressed with the cathode outer frame, the inner side of the right trapezoid bar is tightly pressed with the rod-plate combined cathode array, and the pressing force is adjusted through a fastening screw on the fastening support; the fastening bracket is positioned and installed on the cathode outer frame through the pin hole.
The rod-plate combined type electrolytic machining cathode system is characterized in that: the flow equalizing module is formed by sequentially connecting a longitudinal flow equalizing block and a transverse flow equalizing block; a plurality of transverse thin plates are uniformly distributed in the longitudinal flow equalizing block along the longitudinal direction; a plurality of longitudinally arranged thin plates are uniformly distributed on the inner side of the transverse flow-equalizing block along the transverse direction.
The liquid inlet module consists of a liquid inlet block, a transfer plate and a liquid inlet support; the left side of the liquid inlet block is connected with the flow equalizing module, and the right side of the liquid inlet block is connected with the liquid inlet bracket through the adapter plate; the liquid inlet block is transversely provided with two symmetrically distributed liquid inlets; an L-shaped liquid inlet is distributed on the liquid inlet bracket.
The rod-plate combined type electrolytic machining cathode system is characterized in that: the metal rods in the rod-plate combined cathode array are divided into a plurality of metal rod matrixes by the metal plate, and each metal rod matrix is formed by uniformly and tightly arranging the metal rods with the same diameter along the transverse direction and the longitudinal direction; the diameters or the arrangement shapes of the metal rods in the metal rod matrixes with different specifications are different; and configuring the metal bar matrix and the metal plate according to the flow field simulation result or the test result.
The processing method of the rod-plate combined type electrolytic processing cathode system is characterized in that: in the processing preparation stage, a cathode outer frame, a fastening bracket and a longitudinal flow equalizing block are connected in sequence; according to the simulation result or the test result, the metal bar matrixes and the metal plates in the bar-plate combined cathode array are configured, and a plurality of metal bar matrixes and metal plates are sequentially placed in the hollow part in the middle of the cathode outer frame; respectively installing a transverse fastening module and a longitudinal fastening module, adjusting a set screw on a fastening bracket to fasten the rod-plate combined cathode array, and cutting and polishing the processing surface of the rod-plate combined cathode array; continuously installing a transverse flow equalizing block and a liquid inlet module; in the processing process, the rod-plate combined type electrolytic processing cathode system feeds in a way of being vertical to the cavity surface of the workpiece, the electrolytic reaction starts, and materials on the workpiece are gradually removed by electrolytic corrosion; along with the feeding of the processing, the cathode module gradually extends into the workpiece, and the cavity is gradually formed; and finishing feeding and finishing machining.
In the processing method of the rod-plate combined type electrolytic processing cathode system, the flowing mode of the electrolyte is a positive flow mode; electrolyte flows in from the liquid inlet module, flows in after being stabilized by the transverse flow equalizing block and the longitudinal flow equalizing block, enters the cathode module, enters a processing area through a liquid outlet seam formed by combining metal bars on the bar-plate combined cathode array to participate in electrolytic reaction, and finally flows out from the edge of the cathode outer frame.
The invention has the advantages that:
1. the invention provides an electrolytic machining cathode system and method for realizing full-area liquid supply to a large-area cavity of a workpiece in a metal bar and metal plate combined array mode.
2. The rod-plate combined cathode consists of a configurable metal rod matrix and a metal plate, and the adjustment and optimization of a cathode flow field can be completed by replacing part of the metal rod matrix and the metal plate according to simulation and experiment results; compared with the traditional integral cathode head, the liquid outlet seam can not be independently adjusted when the flow field is optimized, and the whole cathode head generally needs to be processed again.
3. The three-way liquid inlet module consisting of the liquid inlet block and the liquid inlet support can meet the processing liquid supply requirements of different configured cathode modules, and the uniformity of electrolyte supply is improved by matching the longitudinal flow equalizing module and the transverse flow equalizing module.
Drawings
FIG. 1 is an overall assembly view of a bar and plate combined electrochemical machining cathode system;
FIG. 2 is a schematic view of a cathode system structure and flow channels;
FIG. 3 is a schematic view of a bar-plate assembled cathode module configuration;
number designation in the figures: 1. the cathode structure comprises a cathode outer frame, 2 bar plate combined cathode arrays, 3 transverse fastening modules, 4 longitudinal fastening modules, 5 fastening supports, 6 longitudinal flow equalizing blocks, 7 transverse flow equalizing blocks, 8 liquid inlet blocks, 9 adapter plates, 10 liquid inlet supports and 11 workpieces.
Detailed Description
The following describes the specific implementation method of the present invention with reference to the accompanying drawings, which specifically include the following steps:
the device comprises a cathode outer frame, a bar-plate combined cathode array, a transverse fastening module, a longitudinal fastening module, a fastening bracket, a longitudinal flow equalizing block, a transverse flow equalizing block, a liquid inlet block and a liquid inlet bracket.
The process for electrolytically machining the large-area cavity comprises the following steps:
the method comprises the following steps: the cathode outer frame, the fastening bracket and the longitudinal flow-equalizing block are connected and fastened in sequence;
step two: according to the simulation result or the test result, the metal bar matrix and the metal plate of the bar-plate combined cathode array are configured, and a plurality of metal bar matrixes and metal plates are sequentially placed at the hollow part in the middle of the cathode outer frame from bottom to top and from left to right;
step three: respectively installing a transverse fastening module and a longitudinal fastening module, fastening through fastening screws on a fastening bracket, and cutting and polishing a processed surface;
step four: the transverse flow equalizing block, the liquid inlet bracket and the like are sequentially connected;
step five: the liquid inlet block and the liquid inlet bracket are connected with an electrolyte tube, a cathode system is connected with a power supply cathode, and a workpiece is connected with a power supply anode;
step six: tool setting;
step seven: starting a power supply and electrolyte circulating system;
step eight: starting an operation program of the numerical control machine tool, feeding a cathode system vertical to the cavity surface of the workpiece, starting an electrolytic reaction, gradually removing materials on the workpiece by electrolytic etching, gradually extending a cathode module into the workpiece along with the feeding of the workpiece, and gradually forming a region to be processed until the feeding is finished;
step nine: and after the machining is finished, the power is cut off, the electrolyte circulating system is closed, and the workpiece is detached and cleaned.
Claims (5)
1. The utility model provides a combined electrolytic machining cathode system of stick board, by preceding after by stick board combination formula cathode module, fastening module, the module and the feed liquor module of flow equalizing constitute its characterized in that in proper order:
the rod-plate combined cathode module consists of a cathode outer frame (1) and a rod-plate combined cathode array (2); the cathode outer frame (1) is subjected to profile modeling design according to the surface to be processed of the workpiece (11), and the middle part of a processing area is hollowed out; the rod-plate combined cathode array (2) comprises a plurality of corrosion-resistant metal rods; the rod-plate combined cathode array (2) is positioned at the hollow-out position in the middle of the cathode outer frame (1), and the processing side end surface is cut and polished according to the cavity surface of the workpiece (11);
the fastening module consists of a transverse fastening module (3), a longitudinal fastening module (4) and a fastening bracket (5) and is used for pressing and fixing the metal bar and the metal plate in the bar-plate combined cathode array (2); the transverse fastening module (3) and the longitudinal fastening module (4) are respectively formed into a wedge-shaped fastening structure by symmetrically combining two right-angle trapezoidal strips, and the right-angle trapezoidal strips are in clearance fit with the inner side of the cathode outer frame (1); the outer side of the right trapezoid bar is tightly pressed with the cathode outer frame (1), the inner side of the right trapezoid bar is tightly pressed with the rod-plate combined cathode array (2), and the pressing force is adjusted by a fastening screw on the fastening bracket (5); the fastening bracket (5) is positioned and installed on the cathode outer frame (1) through a pin hole.
2. The rod and plate combined electrochemical machining cathode system of claim 1, further characterized by:
the flow equalizing module is formed by sequentially connecting a longitudinal flow equalizing block (6) and a transverse flow equalizing block (7); a plurality of transverse thin plates are uniformly distributed in the longitudinal flow equalizing block (6) along the longitudinal direction; a plurality of longitudinally arranged thin plates are uniformly distributed on the inner side of the transverse flow-equalizing block (7) along the transverse direction.
3. The rod and plate combined electrochemical machining cathode system of claim 1, further characterized by:
the liquid inlet module consists of a liquid inlet block (8), an adapter plate (9) and a liquid inlet support (10); the left side of the liquid inlet block (8) is connected with the flow equalizing module, and the right side of the liquid inlet block is connected with the liquid inlet support (10) through the adapter plate (9); the liquid inlet block (8) is transversely provided with two symmetrically distributed liquid inlets; an L-shaped liquid inlet is distributed on the liquid inlet bracket (10).
4. The rod and plate combined electrochemical machining cathode system of claim 1, further characterized by:
a plurality of metal rods in the rod-plate combined cathode array (2) are divided into a plurality of metal rod matrixes by a metal plate, and each metal rod matrix is formed by uniformly and tightly arranging metal rods with equal diameters along the transverse direction and the longitudinal direction; the diameters or the arrangement shapes of the metal rods in the metal rod matrixes with different specifications are different; and configuring the metal bar matrix and the metal plate according to the flow field simulation result or the test result.
5. The method for processing the combined type electrolytic processing cathode system of the rod and plate of claim 1 or 2, wherein:
in the processing preparation stage, a cathode outer frame (1), a fastening bracket (5) and a longitudinal flow equalizing block (6) are connected in sequence; according to the simulation result or the test result, the metal bar matrix and the metal plate in the bar-plate combined cathode array (2) are configured, and a plurality of metal bar matrixes and metal plates are sequentially placed in the hollow part in the middle of the cathode outer frame (1); respectively installing a transverse fastening module (3) and a longitudinal fastening module (4), adjusting a set screw on a fastening bracket (5) to fasten the rod-plate combined cathode array (2), and cutting and polishing the processing surface of the rod-plate combined cathode array (2); continuously installing a transverse flow equalizing block (7) and a liquid inlet module;
in the processing process, the rod-plate combined type electrolytic processing cathode system is fed vertical to the cavity surface of the workpiece (11), the electrolytic reaction starts, and the material on the workpiece (11) is gradually removed by electrolytic corrosion; along with the feeding of the processing, the cathode module gradually extends into the workpiece (11), and the cavity is gradually formed; finishing feeding and finishing machining;
in the electrolytic processing method, the flowing mode of the electrolyte is a positive flow mode; electrolyte flows in from the liquid inlet module, the flowing electrolyte enters the cathode module after being stabilized by the transverse flow-equalizing block (7) and the longitudinal flow-equalizing block (6), a liquid outlet seam formed by combining metal bars on the bar-plate combined cathode array (2) enters a processing area to participate in electrolytic reaction, and finally the electrolyte flows out from the edge of the cathode outer frame (1).
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| CN113878186A (en) * | 2021-10-27 | 2022-01-04 | 中国航发沈阳黎明航空发动机有限责任公司 | Cathode for electrolytic machining of annular thin-wall part and design method thereof |
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