CN113118573A - Method and device for machining deep and narrow groove by electrolytic milling of tube electrode - Google Patents
Method and device for machining deep and narrow groove by electrolytic milling of tube electrode Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 21
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- 238000003754 machining Methods 0.000 title claims description 48
- 239000003792 electrolyte Substances 0.000 claims abstract description 123
- 239000007788 liquid Substances 0.000 claims abstract description 116
- 238000012545 processing Methods 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 25
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- B23H3/00—Electrochemical machining, i.e. removing metal by passing current between an electrode and a workpiece in the presence of an electrolyte
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Abstract
本发明涉及一种管电极电解铣削加工深窄槽的方法，步骤一：将工件夹持在Z轴移动平台上，将中空结构的管电极安装在X/Y轴移动平台上；步骤二：将电源的负极与管电极电连接，正极与工件电连接；步骤三：通过X/Y轴移动平台将管电极移动至工件的正下方，通过水泵向管电极提供电解液，令电解液从下至上喷出，令工件向管电极的方向移动；步骤四：启动电源，管电极喷出的电解液接触工件，对工件进行电解加工。电解液和不溶性电解产物在重力作用下可直接排出，不会在工件表面非加工区域流动，避免了工件表面受到杂散腐蚀，提高工件表面的质量和提高深窄槽结构精度；同时也避免电解液在已加工区的聚集，避免了对已经完成加工区域造成二次腐蚀，提高加工精度。
The invention relates to a method for electrolytic milling of tube electrodes for processing deep and narrow grooves. The negative pole of the power supply is electrically connected to the tube electrode, and the positive pole is electrically connected to the workpiece; Step 3: Move the tube electrode directly below the workpiece through the X/Y axis moving platform, and supply electrolyte to the tube electrode through a water pump, so that the electrolyte is from bottom to top Ejection to move the workpiece in the direction of the tube electrode; Step 4: Start the power supply, the electrolyte sprayed from the tube electrode contacts the workpiece, and electrolytically processes the workpiece. Electrolyte and insoluble electrolysis products can be directly discharged under the action of gravity, and will not flow in the non-processing area of the workpiece surface, avoiding stray corrosion on the surface of the workpiece, improving the quality of the workpiece surface and improving the structural accuracy of deep and narrow grooves; at the same time, it also avoids electrolysis. The accumulation of liquid in the processed area avoids secondary corrosion to the processed area and improves the processing accuracy.
Description
Technical Field
The invention relates to the technical field of precision machining, in particular to a method and a device for machining a deep and narrow groove by electrolytic milling of a tube electrode.
Background
The deep and narrow groove structure is more and more widely applied to core parts of technical and knowledge-intensive high-tech products such as aircraft engines, industrial gas turbines and the like, and plays an important role. The structure is unique in structure and high in machining precision requirement, the body is made of high-temperature alloy materials which are difficult to machine, and the manufacturing quality, efficiency and cost of the deep and narrow groove structure are obvious due to the characteristics. The electrolytic milling processing is based on the electrochemical anode dissolution principle, adopts tool electrodes (such as ball electrodes, rod electrodes and tube electrodes) with simple shapes, and realizes the processing of complex cavities and molded surfaces by controlling the movement track of the tool electrodes. The technology integrates the technological characteristics of the electrochemical machining and the traditional milling machining, compared with the electrochemical machining of a formed electrode, the design of a formed cathode is avoided, the technology has the advantages of high flexibility, strong adaptability and the like, becomes an important development direction of the electrochemical machining technology, and plays an important role in the aspect of deep and narrow groove machining.
Chinese patent documents with the publication number of 'CN 107414221A' and the publication date of 2019, 4 and 30 disclose an electrochemical induction processing method of a three-dimensional micro-nano structure, wherein a processed workpiece is fixed at the bottom of an electrolytic cell in an electrochemical system, and then the electrolytic cell is fixed on an X-Y direction horizontal displacement table; fixing the micro-nano cutter electrode on a clamp, and fixing the clamp on a Z-direction displacement table; injecting electrolyte into the electrolytic cell to ensure that the electrolyte submerges the workpiece to be processed; controlling the micro-nano cutter electrode to approach the processed material; the Z-direction micro-motion displacement table is set to be in a closed-loop mode, and the electrochemical current of the micro-nano-sized cutter electrode is used as a closed-loop signal of the micro-nano-sized cutter electrode; and when the micro-nano cutter electrode performs scanning motion, modulating the electrochemical current of the cutter electrode in real time according to the three-dimensional shape of the pre-processing structure, and finally processing a preset three-dimensional micro-nano structure on the surface of the processed workpiece. In addition, the intermittent pulse electrolytic machining device has the publication number of "CN 109500462A", the publication number of 2019, 3, month and 22, and comprises an electrolyte tank, a water pump, an electrolytic pulse power supply, a machining platform and a driving mechanism, wherein the machining platform is provided with a chuck for clamping a workpiece, the machining platform is provided with a machining shaft right above the chuck, the machining shaft is driven by the driving mechanism to move linearly up and down, the lower end of the machining shaft is provided with a convex tooth for machining an inner key groove, the cathode of the electrolytic pulse power supply is electrically connected with the machining shaft, and the anode of the electrolytic pulse power supply is electrically connected with the chuck and the workpiece; the water inlet of the water pump is communicated with the electrolyte tank, and the water outlet of the water pump conveys electrolyte to the convex teeth of the processing shaft and the position to be processed of the workpiece through the liquid supply pipe. Based on the anode dissolution principle, the workpiece is used as an electrolytic anode, the convex teeth of the processing shaft are used as an electrolytic cathode, and the inner key groove of the workpiece is slowly dissolved under the electrolytic action until the inner key groove is completely processed.
In the technical scheme, however, workpieces are all positioned below the processing shaft electrode, the workpieces are soaked in the electrolyte or the electrolyte and processing products are collected on the surfaces of the workpieces, under the two conditions, the electrolyte easily causes stray corrosion to a non-processing area of the workpiece under the influence of stray current, so that the fillet of the edge of the deep narrow groove is increased, the structural accuracy is reduced, and the surface quality of the non-processing area of the surface of the workpiece is influenced; if the electrolyte is collected and accumulated in the machined area, secondary corrosion is caused to the inner wall of the machined deep and narrow groove under the action of stray current, and the size precision of the deep and narrow groove is reduced.
Disclosure of Invention
The invention provides a method and a device for machining a deep and narrow groove by electrolytic milling of a tube electrode, aiming at overcoming the problems of insufficient machining precision and poor surface quality of the deep and narrow groove machined by electrolytic machining in the prior art, and improving the precision of the deep and narrow groove and the surface quality of a workpiece.
In order to solve the technical problems, the invention adopts the technical scheme that: a device for machining a deep and narrow groove by electrolytic milling of a tube electrode comprises the following steps:
the method comprises the following steps: clamping a workpiece on a Z-axis moving platform, and mounting a tube electrode with a hollow structure on an X/Y-axis moving platform;
step two: electrically connecting the negative electrode of a power supply with the tube electrode, and electrically connecting the positive electrode of the power supply with the workpiece;
step three: moving the tube electrode to the position right below the workpiece through the X/Y axis moving platform, providing electrolyte into the tube electrode through a water pump, spraying the electrolyte from bottom to top, and starting the Z axis moving platform to move the workpiece to the direction of the tube electrode;
step four: and starting the power supply, and enabling the electrolyte sprayed by the tube electrode to contact the workpiece to perform electrolytic machining on the workpiece. The machining process is to control the motion tracks of the tube electrodes on the X/Y plane and realize the electrolytic milling machining of deep and narrow grooves with different tracks.
In the processing method, contrary to the existing processing mode and thought, the workpiece is positioned above the processing cutter, and the electrolyte is sprayed from bottom to top. After the electrolyte sprayed from the tube electrode is contacted with the workpiece, the workpiece is moved along the Z axis by continuously moving the workpiece, and the tube electrode is moved along the X axis and the Y axis, so that the electrolyte is sprayed in the track of the deep and narrow groove to electrolyze the workpiece in the processing area of the workpiece, and the deep and narrow groove is formed on the workpiece. In the machining process, the electrolyte and insoluble electrolysis products sprayed on the workpiece can flow downwards under the action of gravity, and the electrolyte only flows to a region to be machined by controlling the movement of the tube electrode and the workpiece, but cannot flow to a non-machined region on the surface of the workpiece and a machined region and accumulate or collect, so that the phenomenon that the electrolyte causes stray corrosion on the workpiece under the action of stray current is avoided.
Preferably, in the electrolytic machining process of the workpiece, the workpiece is controlled to move downwards along the Z axis by the Z axis moving platform, and the blind hole is machined; and then controlling the tube electrode to move in the X-axis and/or Y-axis direction through the X/Y-axis moving platform to complete the processing of the deep and narrow grooves with different tracks. Electrolyte is from managing electrode blowout back, an ascending pressure has earlier, then will receive the effect of gravity, along managing electrode all around the downflow, the flow path of electrolyte is equivalent to one can process all around with the processing cutter on top, the electrolytic machining effect through the electrolyte top accomplishes the blind hole processing back, only need to make tub electrode along X axle or Y axle direction translation can further realize the processing of dark narrow groove, only need control the hydraulic pressure of electrolyte at this in-process just can adjust the width and the height that electrolyte flows the orbit, realize the regulation of electrolyte processing radius, it is more convenient to make processing, the precision is higher.
The device for realizing the method for machining the deep and narrow groove by the tube electrode electrolytic milling comprises an X/Y-axis moving platform, a Z-axis moving platform, an electrolyte supply assembly and a power supply, wherein the Z-axis moving platform is positioned above the X/Y-axis moving platform; a workpiece clamp for fixing a workpiece is arranged on the Z-axis moving platform; the tube electrode is of a hollow structure, and the electrolyte supply assembly supplies electrolyte to an inner cavity of the tube electrode; the cathode of the power supply is electrically connected with the tube electrode, and the anode is used for being electrically connected with a workpiece.
In the technical scheme of the processing device, the workpiece is fixed on the workpiece clamp, the Z-axis moving platform drives the workpiece to vertically move up and down, and the processing surface of the workpiece faces downwards. The X/Y axis moving platform is fixed to the tube electrode, the X/Y axis moving platform drives the tube electrode to move on the X axis and the Y axis, when the machining surface of the workpiece is aligned to the tube electrode, the electrolyte supply assembly supplies electrolyte to the tube electrode, the electrolyte is sprayed out from bottom to top, the power supply also supplies power to the workpiece and the tube electrode, and the workpiece is subjected to electrolytic machining after the electrolyte contacts the workpiece. The sprayed electrolyte flows downwards under the action of gravity and can also be arranged to flow back to the electrolyte supply assembly. Because the electrolyte can flow downwards, the electrolyte can not be accumulated and collected on the surface of the workpiece, and the electrolyte is prevented from reacting with other non-processing areas of the workpiece to generate stray corrosion. Meanwhile, under the common influence of the movement of the tube electrode and the downward flow of the electrolyte, the electrolyte cannot be in contact with the machined areas, and secondary corrosion to the areas is avoided.
Preferably, an electrolytic cell is arranged on the X/Y-axis moving platform, and the tube electrode is arranged in the electrolytic cell; the electrolytic cell is in communication with the electrolyte supply assembly. The electrolyte flowing downwards completely flows back into the electrolytic cell, and the electrolyte is recycled through the collection function of the electrolytic cell and the electrolyte supply assembly.
Preferably, a second clamp is arranged in the electrolytic cell; the second clamp comprises a base fixed in the electrolytic cell and a clamp head arranged on the base; the clamp head is used for clamping the tube electrode; the base is provided with a cavity which is respectively communicated with the inner cavity of the tube electrode and the electrolyte supply assembly. The first clamping pipe electrode's of anchor clamps pain is lost, and in the cavity of base was inserted to the one end of pipe electrode, electrolyte supply subassembly supplied electrolyte to the inner chamber of second anchor clamps, because pipe electrode and inner chamber intercommunication, after the inner chamber was filled with electrolyte, electrolyte will be upwards spout along pipe electrode.
Preferably, a collet is arranged at the clamp head, and the clamp head fixes the tube electrode by clamping the collet. The clamp head can be of a structure such as a clamping jaw disc, so that the clamp head can clamp the collet firstly in order to avoid unstable or clamp the tube electrode due to line contact between the clamping jaw disc and the tube electrode, and the tube electrode is clamped through surface contact between the collet and the tube electrode, so that the tube electrode is more stable and prevented from being clamped.
Preferably, the electrolyte supply assembly comprises a liquid return tank and a liquid supply tank; the electrolytic tank is provided with a liquid outlet, and the cavity is provided with a liquid inlet; the liquid supply box is communicated with the liquid inlet through a liquid supply pump, the liquid return box is communicated with the liquid outlet through a connecting pipe, and the liquid return box is communicated with the liquid supply box through a liquid return pump. The liquid supply pump and the liquid return pump are both water pumps, and electrolyte is filled in the liquid supply tank. The water inlet end of the liquid supply pump is connected with the liquid supply box, the water outlet end of the liquid supply pump is communicated with the liquid inlet, the electrolyte in the liquid supply box is pumped into the cavity, and certain pressure is provided. And the electrolyte and the insoluble electrolysis products which flow back to the electrolytic bath enter the liquid return tank through the liquid outlet. The water inlet end of the liquid return pump is communicated with the liquid return box, the water outlet end of the liquid return pump is communicated with the liquid supply box, and the liquid return pump pumps the liquid in the liquid return box to the liquid supply box, so that the recycling of the electrolyte is realized.
Preferably, a filtering device is further arranged between the liquid return tank and the liquid supply tank, a water outlet of the liquid return pump is connected with the filtering device, and a water outlet of the filtering device is communicated with the liquid supply tank. When the liquid return pump extracts liquid to the liquid supply tank, liquid can pass through filter equipment, filters out the insoluble electrolysis product through filter equipment's effect, and only electrolyte can get into the liquid supply tank through filter equipment, avoids insoluble electrolysis product circulation backward flow to tub electrode department, influences electrolytic machining's quality.
Preferably, the water outlet of the liquid supply pump is further connected with a pressure regulating valve for regulating the pressure of the electrolyte, so as to control the spraying height of the electrolyte and the processing width formed by the backflow track. The machining width refers to the width between the edge of the electrolyte and the center of the tube electrode when the electrolyte flows downwards, and the larger the pressure is, the higher the height of the electrolyte sprayed out is, and the larger the machining width is. The smaller the pressure, the opposite is true.
Preferably, the liquid outlet is positioned below the liquid inlet. When the reflowed electrolyte is accumulated to the liquid outlet for discharge, the liquid inlet is higher than the liquid outlet, so that the liquid in the liquid outlet can be prevented from flowing into the liquid inlet.
Compared with the prior art, the invention has the beneficial effects that: the electrolyte and the insoluble electrolysis products flow downwards under the action of gravity, and only flow at the processing area of the workpiece, but not flow at the non-processing area, so that the surface of the non-processing area is prevented from being subjected to stray corrosion, and the surface quality of the workpiece is improved; meanwhile, the fillet at the edge of the deep narrow groove cannot be increased, and the structural precision of the deep narrow groove is improved. The tube electrode only moves in the area to be processed, so that the electrolyte cannot flow back to the area which is processed, secondary corrosion to the area which is processed is avoided, and the processing precision of the deep and narrow groove is improved.
Drawings
FIG. 1 is a flow chart of a method for machining deep and narrow grooves by electrolytic milling of a tube electrode according to the invention;
FIG. 2 is a schematic structural diagram of a device for machining deep and narrow grooves by electrolytic milling of a tube electrode according to the invention;
FIG. 3 is a schematic illustration of the electrolytic process of the tube electrode and workpiece of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", "long", "short", etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the drawings, it is only for convenience of description and simplicity of description, but does not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationships in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The technical scheme of the invention is further described in detail by the following specific embodiments in combination with the attached drawings:
example 1
Fig. 1 shows an embodiment of a method for machining a deep and narrow groove by electrolytic milling of a tube electrode, which comprises the following steps:
the method comprises the following steps: clamping a workpiece on a Z-axis moving platform of a machine tool, and mounting a tube electrode with a hollow structure on an X/Y-axis moving platform of the same machine tool;
step two: electrically connecting the negative electrode of a power supply with the tube electrode, and electrically connecting the positive electrode of the power supply with the workpiece;
step three: moving the tube electrode to the position right below the workpiece through the X/Y axis moving platform, providing electrolyte into the tube electrode through a water pump, spraying the electrolyte from bottom to top, and starting the Z axis moving platform to move the workpiece to the direction of the tube electrode;
step four: and starting the power supply, and enabling the electrolyte sprayed by the tube electrode to contact the workpiece to perform electrolytic machining on the workpiece. In the process of carrying out electrolytic machining on the workpiece, the workpiece is controlled to descend along the Z axis by the Z axis moving platform, and the blind hole is machined; and then controlling the tube electrode to move in the X-axis and/or Y-axis direction through the X/Y-axis moving platform to complete the electrolytic milling processing of the deep and narrow grooves with different tracks.
After the electrolyte sprayed from the tube electrode is contacted with the workpiece, the workpiece is moved along the Z axis by continuously moving the workpiece, and the tube electrode is moved along the X axis and the Y axis, so that the electrolyte is sprayed in the track of the deep and narrow groove to electrolyze the workpiece in the processing area of the workpiece, and the deep and narrow groove is formed on the workpiece. In the machining process, the electrolyte and insoluble electrolysis products sprayed on the workpiece can flow downwards under the action of gravity, and the electrolyte only flows to a region to be machined by controlling the movement of the tube electrode and the workpiece, but cannot flow to a non-machining region and a machined region and accumulate or collect, so that the stray corrosion of the electrolyte on the workpiece caused by the action of stray current is avoided.
Electrolyte is from managing electrode blowout back, an ascending pressure has earlier, then will receive the effect of gravity, along managing electrode all around the downflow, the flow path of electrolyte is equivalent to one can process all around with the processing cutter on top, the electrolytic machining effect through the electrolyte top accomplishes the blind hole processing back, only need to make tub electrode along X axle or Y axle direction translation can further realize the processing of dark narrow groove, only need control the hydraulic pressure of electrolyte at this in-process just can adjust the width and the height that electrolyte flows the orbit, realize the regulation of electrolyte processing radius, it is more convenient to make processing, the precision is higher.
The beneficial effects of this embodiment: the electrolyte and the insoluble electrolysis products flow downwards under the action of gravity, and only flow at the processing area of the workpiece, but not flow at the non-processing area, so that the surface of the non-processing area is prevented from being subjected to stray corrosion, and the surface quality of the workpiece is improved; meanwhile, the fillet at the edge of the deep narrow groove cannot be increased, and the structural precision of the deep narrow groove is improved. The tube electrode only moves in the area to be processed, so that the electrolyte cannot flow back to the area which is processed, secondary corrosion to the area which is processed is avoided, and the processing precision of the deep and narrow groove is improved.
Example 2
Fig. 2-3 show an embodiment of an apparatus for processing deep and narrow grooves by electrolytic milling of a tube electrode, which can be used for implementing the method of embodiment 1. The device comprises an X/Y axis moving platform 1, a Z axis moving platform 2 positioned above the X/Y axis moving platform 1, an electrolyte supply component 3 and a power supply 4, wherein a tube electrode 5 is arranged on the X/Y axis moving platform 1; a workpiece clamp 6 for fixing a workpiece is arranged on the Z-axis moving platform 2; the tube electrode 5 is of a hollow structure, and the electrolyte supply component 3 supplies electrolyte to the inner cavity of the tube electrode 5; the negative pole of the power source 4 is electrically connected to the tube electrode 5 and the positive pole is used for electrical connection to the workpiece. The X/Y-axis moving platform 1 and the Z-axis moving platform 2 are parts of the same processing machine tool.
Specifically, an electrolytic bath 7 is arranged on the X/Y axis moving platform 1, and the tube electrode 5 is arranged in the electrolytic bath 7; the electrolytic bath 7 communicates with the electrolyte supply assembly 3. The electrolyte flowing downwards totally flows back into the electrolytic tank 7, and the recycling of the electrolyte is realized through the collection function of the electrolytic tank 7 and the electrolyte supply assembly 3.
Specifically, a second clamp 8 is arranged in the electrolytic cell 7; the second clamp 8 comprises a base 801 fixed in the electrolytic bath 7 and a clamp head 802 mounted on the base 801; the clamp head 802 is used for clamping the tube electrode 5; the base 801 is provided with a cavity 803, and the cavity 803 is respectively communicated with the inner cavity of the tube electrode 5 and the electrolyte supply assembly 3. The clamp head 802 clamps the pain loss of the tube electrode 5, one end of the tube electrode 5 is inserted into the cavity 803 of the base 801, the electrolyte supply assembly 3 supplies electrolyte to the inner cavity of the second clamp 8, and the tube electrode 5 is communicated with the inner cavity, so that the electrolyte can be sprayed upwards along the tube electrode 5 after the inner cavity is filled with the electrolyte.
Wherein, a collet 804 is arranged at the clamp head 802, and the clamp head 802 fixes the tube electrode 5 by clamping the collet 804. The clamp head 802 may be a jaw disc or the like, so as to avoid that the jaw disc is easily unstable or the tube electrode 5 is clamped by the jaw disc in line contact with the tube electrode 5, the clamp head 802 may first clamp the collet 804, and the tube electrode 5 is clamped by the surface contact between the collet 804 and the tube electrode 5, so that the tube electrode 5 is more stable and the tube electrode 5 is prevented from being clamped.
Specifically, the electrolyte supply assembly 3 includes a liquid return tank 301 and a liquid supply tank 302; the electrolytic tank 7 is provided with a liquid outlet 701, and the cavity 803 is provided with a liquid inlet 8031; the liquid supply tank 302 is communicated with the liquid inlet 8031 through the liquid supply pump 303, the liquid return tank 301 is communicated with the liquid outlet 701 through a connecting pipe, and the liquid return tank 301 is communicated with the liquid supply tank 302 through the liquid return pump 304. The liquid supply pump 303 and the liquid return pump 304 are water pumps, and the liquid supply tank 302 is filled with electrolyte. The liquid feed pump 303 has a water inlet end connected to the liquid feed tank 302 and a water outlet end communicated with the liquid inlet 8031, and pumps the electrolyte in the liquid feed tank 302 into the cavity 803 and provides a certain pressure. The electrolytic solution and the insoluble electrolysis products that have returned to the electrolytic cell 7 enter the return tank 301 through the drain port 701. The water inlet end of the liquid return pump 304 is communicated with the liquid return tank 301, the water outlet end is communicated with the liquid supply tank 302, and the liquid return pump 304 pumps the liquid in the liquid return tank 301 to the liquid supply tank 302, so that the electrolyte is recycled.
Wherein, still be provided with filter equipment 305 between liquid return tank 301 and the feed tank 302, the delivery port and the filter equipment 305 of liquid return pump 304 are connected, and the delivery port and the feed tank 302 intercommunication of filter equipment 305. When liquid is pumped to the liquid supply tank 302 by the liquid return pump 304, the liquid passes through the filter device 305, the insoluble electrolytic product is filtered out under the action of the filter device 305, only the electrolyte can enter the liquid supply tank 302 through the filter device 305, and the insoluble electrolytic product is prevented from circulating and flowing back to the pipe electrode 5 to affect the quality of electrolytic processing.
Further, a pressure regulating valve 306 is connected to the water outlet of the liquid feed pump 303 to regulate the pressure of the electrolyte, thereby controlling the height of the electrolyte and the processing width formed by the backflow track. The machining width is the width between the edge of the electrolyte and the center of the tube electrode 5 when the electrolyte flows downwards, and the larger the pressure is, the higher the height of the electrolyte ejection is, and the larger the machining width is. The smaller the pressure, the opposite is true.
In addition, the drain port 701 is located below the liquid inlet 8031. When the backflow electrolyte is accumulated to the liquid outlet 701 and is discharged, and the liquid inlet 8031 is higher than the liquid outlet 701, the liquid in the liquid outlet 701 can be prevented from flowing into the liquid inlet 8031.
The working principle of the embodiment is as follows: and fixing a workpiece 9 on the workpiece clamp 6, driving the workpiece to vertically move up and down by the Z-axis moving platform 2, and enabling the processing surface of the workpiece 9 to face downwards. On the fixed second anchor clamps 8 of pipe electrode 5, X/Y axle moving platform 1 drives second anchor clamps 8 and removes to make pipe electrode 5 remove at X axle and Y axle, when the machined surface of work piece 9 aimed at pipe electrode 5, liquid feed box 302 supplied electrolyte to pipe electrode 5 inside through feed pump 303 and air-vent valve 306, made electrolyte spout from down up, power 4 also for work piece and pipe electrode 5 circular telegram, made electrolyte contact work piece back to the electrolytic machining to work piece 9. The sprayed electrolyte and insoluble electrolysis products flow downward by gravity and flow into the electrolytic bath 7. The electrolyte and the insoluble electrolysis products in the electrolytic cell 7 enter the liquid return tank 301 through the liquid outlet 701, then enter the liquid supply tank 302 through the liquid return pump 304 and the filter device 305, and then are supplied to the cavity 803 of the second clamp 8 through the action of the liquid supply pump 303, so that circulation is formed in sequence. Because electrolyte can flow downwards, consequently can not accumulate and collect on the work piece, avoid electrolyte and other non-processing region of work piece between take place the reaction, produce stray corrosion. Meanwhile, under the common influence of the movement of the tube electrode 5 and the downward flow of the electrolyte, the electrolyte does not contact with the regions which are already machined, and secondary corrosion to the regions is avoided.
The beneficial effects of this embodiment: the electrolyte and the insoluble electrolysis products flow downwards under the action of gravity, and only flow at the processing area of the workpiece, but not flow at the non-processing area, so that the surface of the non-processing area is prevented from being subjected to stray corrosion, and the surface quality of the workpiece is improved; meanwhile, the fillet at the edge of the deep narrow groove cannot be increased, and the structural precision of the deep narrow groove is improved. Meanwhile, the tube electrode 5 only moves in the area to be processed, so that the electrolyte cannot flow back to the area which is processed, secondary corrosion to the area which is processed is avoided, and the processing precision of the deep and narrow groove is improved.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
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