阅读说明：本技术 叶片组合式旋转阴极电解铣削工具及方法 (Blade combined type rotary cathode electrolytic milling tool and method ) 是由 沈志豪 曲宁松 刘通 李寒松 于 2021-07-22 设计创作，主要内容包括：本发明涉及一种叶片组合式旋转阴极电解铣削工具及方法,属于电解加工领域。本发明提出的叶片组合式旋转阴极包括工具电极、卡槽环、叶片、卡套和紧定螺钉。安装时,将叶片嵌入卡槽环的侧面凹槽,然后在卡槽环的内孔中插入工具电极,最后套上卡套,用紧定螺钉固定。工具电极正转产生的向上气体流场可以在叶轮下方为加工间隙内电解液提供远小于大气压的低压区,加速电解液的流动更新,促进热量和产物的快速排出。这样可以保持加工间隙内电解液的高洁净度、高电导率,促进电解作用的持续高效进行。本发明可以有效地提高电解铣削加工的加工效率和加工后工件的表面质量。(The invention relates to a blade combined type rotary cathode electrolytic milling tool and a method, belonging to the field of electrolytic machining. The blade combined type rotating cathode provided by the invention comprises a tool electrode, a clamping groove ring, blades, a clamping sleeve and a set screw. During installation, the blades are embedded into the side grooves of the clamping groove rings, then tool electrodes are inserted into the inner holes of the clamping groove rings, and finally the clamping sleeves are sleeved and fixed by fastening screws. The upward gas flow field generated by the forward rotation of the tool electrode can provide a low-pressure area which is far less than the atmospheric pressure for the electrolyte in the machining gap below the impeller, so that the flow renewal of the electrolyte is accelerated, and the rapid discharge of heat and products is promoted. Therefore, the high cleanliness and the high conductivity of the electrolyte in the machining gap can be kept, and the continuous and efficient operation of the electrolysis is promoted. The invention can effectively improve the processing efficiency of electrolytic milling processing and the surface quality of the processed workpiece.)

1. A blade combined type rotary cathode electrolytic milling tool is characterized in that:

comprises a tool electrode (1), a clamping groove ring (2), a blade (3), a clamping sleeve (4) and a set screw (5);

the tool electrode (1) is a cylindrical electrode, and the bottom of the tool electrode is provided with a plurality of liquid outlet holes;

the clamping groove ring (2) consists of an upper part and a lower part, the outer diameter of the cylindrical structure of the upper part is smaller than that of the cylindrical structure of the lower part, and the whole clamping groove ring is of a boss-shaped circular ring structure; the inner diameter of the clamping groove ring (2) is equal to the outer diameter of the cathode of the tool, and a plurality of grooves are distributed on the surface of an outer cylindrical structure at the lower part of the clamping groove ring (2) along the circumferential direction;

the clamping sleeve (4) is of a circular ring structure, the center of the clamping sleeve is a stepped hole, the smaller inner hole diameter of the upper part of the clamping sleeve (4) is equal to the outer diameter of the cylindrical structure of the upper part of the clamping groove ring (2), and the larger inner hole diameter of the lower part of the clamping sleeve (4) is equal to the outer diameter of the cylindrical structure of the lower part of the clamping groove ring (2);

the blade (3) consists of an upper part and a lower part, wherein the upper part is a T-shaped blade handle, and the lower part is a blade body;

the T-shaped blade handle of the blade (3) is embedded into the groove on the side surface of the clamping groove ring (2) from top to bottom; the horizontal part of the T-shaped blade handle is pressed on the step surface of the clamping groove ring (2), and the clamping groove ring (2) and all the blades (3) form an impeller;

a plurality of through holes are arranged on the surface of the cylindrical structure at the upper part of the clamping groove ring (2), and threaded holes which are arranged corresponding to the through holes of the clamping groove ring (2) are arranged at the upper part of the clamping sleeve (4);

the clamping groove ring (2) is sleeved on the tool electrode (1) and keeps the bottom surface of the tool electrode (1) and the bottom surfaces of all the blades (3) coplanar; the cutting sleeve (4) is sleeved on the clamping groove ring (2), the top surface of the cutting sleeve (4) is kept coplanar with the top surface of the clamping groove ring (2), and the step surface of the stepped hole of the cutting sleeve (4) is pressed on the top surface of the horizontal part of the T-shaped blade handle of the blade (3); the fastening screw (5) penetrates through the threaded hole of the clamping sleeve (4) and the through hole of the clamping groove ring (2) and then finally abuts against the outer cylindrical surface of the tool electrode (1), and the clamping groove ring (2) and the clamping sleeve (4) are connected and fixed together with the tool electrode (1) and the blade (3).

2. The blade combination rotary cathode electrolytic milling tool of claim 1, wherein: the size, curvature and angle of the blade bodies of different blades (3) can be adjusted and combined, and the number of the blades (3) can be adjusted according to requirements.

3. The blade combination rotary cathode electrolytic milling tool of claim 1, wherein: the blade body of a part of the blades (3) is of a frame structure, and the surface of the blade body is fixedly provided with a developed filtering adsorption film.

4. The blade combination rotary cathode electrolytic milling tool of claim 1, wherein: the tool electrode (1) is made of metal materials, and the clamping groove ring (2), the blades (3), the clamping sleeve (4) and the set screw (5) are made of insulating materials.

5. A method of electrowinning using the blade combination rotary cathode electrowinning tool of claim 1, characterized by the following process:

the tool electrode (1) is connected with a negative pole of a power supply and vertically clamped on a main shaft of a machine tool, and the workpiece (6) is connected with a positive pole of the power supply; electrolyte flows in from a liquid inlet hole at the top end of the tool electrode (1) through the main shaft and then flows out from a liquid outlet hole at the bottom of the tool electrode (1) to a processing area of a workpiece (6);

during processing, the tool electrode (1) and the workpiece (6) are electrified, and the material of the workpiece (6) right below the tool electrode (1) is dissolved under the electrolytic action to generate a large amount of insoluble electrolysis product (7) particles; at the moment, the tool electrode (1) rotates in the forward rotation direction (9) to drive the impeller to rotate at a high speed to generate an upward gas flow field, so that the pressure intensity of the bottom area of the impeller is reduced, the difference between the internal pressure and the external pressure of the machining gap is increased, and the electrolyte in the machining gap is attracted; electrolyte flowing out of a liquid outlet hole at the bottom of the tool electrode (1) is accelerated to diffuse towards the periphery or even the upper part along the radius direction of the impeller, and carries heat generated by processing and electrolytic product (7) particles to be rapidly discharged; therefore, the updating speed of the electrolyte in the machining gap is accelerated, the cleanness of the electrolyte in the machining gap can be maintained all the time, the higher conductivity is ensured, the efficient and continuous electrolysis is promoted, and the removal rate of the machined material is improved;

the rapid discharge of the electrolysis product (7) particles can also avoid the pollution of the electrolysis product on the processing surface, and the surface quality of the processed workpiece (6) is improved.

Technical Field

The invention relates to a blade combined type rotary cathode electrolytic milling tool and a method, belonging to the field of electrolytic machining.

Background

The titanium alloy, the high-temperature alloy and other metal materials have high specific strength and good heat resistance and corrosion resistance, so the titanium alloy and the high-temperature alloy are widely applied to the fields of aerospace, automobiles, ships and the like. However, because titanium alloys and high temperature alloys have high hardness and poor thermal conductivity, if a conventional cutting method is used, the cutting force is high, and the temperature of a machining area is high, which causes severe wear of a tool and also affects the physical properties of the surface of the material; the electric spark processing uses heat generated by spark discharge to remove materials, and if the electric spark processing is used for processing materials such as titanium alloy, a recast layer and residual stress are easily generated on the surface of the materials; the electrochemical machining removes materials by means of electrochemical anode dissolution, has the advantages of no influence of mechanical properties of the materials on machining, low cost, no stress, no cutter loss and the like, and is widely applied to machining of materials which are difficult to machine, such as titanium alloy and the like.

In recent years, the electrolytic milling process is increasingly applied to processing materials such as titanium alloy, high-temperature alloy and the like. Unlike traditional electrolytic machining process with formed electrode, electrolytic milling uses rod or ball shaped electrode as rotating cathode and controls the moving path and machining parameters of the electrode in a digital control milling method to machine required profile in the workpiece. Therefore, electrolytic milling is a high-flexibility and low-cost electrolytic machining process.

Although the electrolytic milling process has certain advantages in processing difficult-to-process materials such as titanium alloy, the electrolytic milling process has some inherent defects in the processing principle. In a general forward flow type electrolytic milling process, electrolyte falls from the interior of a vertical electrode, impacts the surface of a horizontal workpiece, then flows into a very narrow processing gap (generally ranging from 0.1mm to 0.5 mm), and finally flows out from the very narrow processing gap, so that the flow field of the electrolyte in the processing gap is very disordered, particularly the poor condition of the electrolyte flow field is aggravated when the processing gap is too small, the insufficient supply of flow is caused, and even the phenomena of local liquid shortage, cavity and short circuit are generated, and the precision and stability of electrolytic processing are seriously influenced. And because the flow rate of the electrolyte is greatly reduced due to the blockage of the surface of the horizontal workpiece and the blockage of the atmospheric pressure outside the gap, the flow rate of part of the electrolyte capable of being extruded out of the processing gap is exponentially reduced, and part of the electrolyte which cannot be extruded out of the processing gap circles in the gap and even generates a dead water zone. The disordered and slow electrolyte can cause that product particles generated by electrolysis are difficult to discharge as soon as possible, and the increase of the product particles retained in the processing gap can reduce the conductivity of the electrolyte and prevent the electrolysis from fully proceeding; the product particles exiting the gap may also partially reside on the machined or unmachined surface as the electrolyte flow rate decreases, compromising the surface quality of the machined workpiece.

Common improvement methods for solving the problem of the flow field in the gap of the forward electrolytic milling include increasing the pressure of an electrolyte inlet, a pulsating flow field method, a vibrating electrode method and the like. The effect of simply increasing the electrolyte inlet pressure is not significant and may even be counterproductive when encountering complex machining surfaces or machining requirements. Similarly, a method of directly adjusting the electrolyte is also a pulsating flow field method. The patent "method and device for electrolytic machining of pulsating flow field tube electrode" (patent publication No. CN102198549B, inventor: dawn dragon; triarrhena; Trigonopsis) invented a pulsating flow field tube electrode electrolytic machining device, which utilizes a pressure servo control system to control the action of a servo valve core to regulate flow and pressure and output pulsating electrolyte to an electrolytic machining area. The pulse electrolyte jet flow enters the machining gap at a high speed, strong pulsating vortex flow is generated at the pipe orifice, the bottom of the hole is continuously impacted in a fluctuating pressure mode, and a flow field in the gap is improved. The method has a direct principle and obvious effect, but has complex operation and high professional requirements, particularly has high requirements on calculation of flow field pulsation parameters (waveform, amplitude, frequency and the like), analysis of flow field pulsation phase relation, signal feedback dynamic adjustment and the like, and is difficult to operate practically. Another method different from the above method is a vibrating electrode method, in which a periodic variation in the machining gap between the cathode and the anode is realized by controlling the periodic vibration of the cathode. The method is that the power is switched on for electrolytic machining when the machining gap is the minimum, when the cathode vibration leaves the minimum gap, the power supply is switched off, the electrolytic machining is stopped, the gap reaches the maximum (the vibration is carried out to the uppermost end), negative pressure is formed, the electrolyte starts to be washed, and the electrolyte can be quickly updated. The patent "a kind of electrolytic machining vibration feed motion realizing device" (publication number: CN 103028795A) realizes the vibration motion by the voice coil motor drive; in the patent of an electrolytic machining vibration device (No. CN 106825800B), a cam mechanism and a cam follower are used for realizing vibration motion; in the patent "a vibration feed motion realizing device for electrolytic machining" (grant publication number: CN 110539043B), a screw slide block is used for realizing vibration motion. The vibrating electrode method has simple operation and obvious effect, but the device is complex and has higher cost. And for the vibrating electrode method, basically all need to match pulse power supply, realize that the degree of difficulty of electrode vibration cycle and power supply pulse cycle synchronization requirement is higher. Therefore, a simple flow field improving device is needed to be found, which can efficiently and conveniently solve the problem of the flow field in the positive flow type electrolytic machining gap.

Disclosure of Invention

In view of the problems in the prior art, the invention provides a blade combined type rotary cathode electrolytic milling tool and a blade combined type rotary cathode electrolytic milling method, aiming at spontaneously generating a gas flow field by using a simple device to adjust the pressure difference between the inside and the outside of a machining gap and improve the electrolyte flow field in the electrolytic milling machining gap.

A blade combined type rotary cathode electrolytic milling tool is characterized in that:

comprises a tool electrode, a clamping groove ring, a blade, a clamping sleeve and a set screw;

the tool electrode is a cylindrical electrode, and the bottom of the tool electrode is provided with a plurality of liquid outlet holes;

the clamping groove ring consists of an upper part and a lower part, the outer diameter of the cylindrical structure of the upper part is smaller than that of the cylindrical structure of the lower part, and the whole clamping groove ring is of a boss-shaped circular ring structure; the inner diameter of the clamping groove ring is equal to the outer diameter of the tool cathode; a plurality of grooves are arranged on the surface of an outer cylindrical structure at the lower part of the clamping groove ring along the circumferential direction;

the clamping sleeve is of a circular ring structure, the center of the clamping sleeve is a stepped hole, the smaller inner hole diameter of the upper part of the clamping sleeve is equal to the outer diameter of the cylindrical structure of the upper part of the clamping groove ring, and the larger inner hole diameter of the lower part of the clamping sleeve is equal to the outer diameter of the cylindrical structure of the lower part of the clamping groove ring;

the blade consists of an upper part and a lower part, wherein the upper part is a T-shaped blade handle, and the lower part is a blade body;

the T-shaped blade handle of the blade is embedded into the groove on the side surface of the clamping groove ring from top to bottom; the horizontal part of the T-shaped blade handle is pressed on the step surface of the clamping groove ring, and the clamping groove ring and all the blades form an impeller;

a plurality of through holes are arranged on the surface of the cylindrical structure at the upper part of the clamping groove ring, and threaded holes which are arranged corresponding to the through holes of the clamping groove ring are arranged at the upper part of the clamping sleeve; thus, the clamping sleeve can be perfectly connected with the clamping groove ring and is tightly matched with the clamping groove ring;

the clamping groove ring is sleeved on the tool electrode, and the bottom surface of the tool electrode is kept to be coplanar with the bottom surfaces of all the blades; the clamping sleeve is sleeved on the clamping groove ring, the top surface of the clamping sleeve is kept to be coplanar with the top surface of the clamping groove ring, and the step surface of the stepped hole of the clamping sleeve is pressed on the top surface of the horizontal part of the T-shaped blade handle of the blade; and the set screw penetrates through the threaded hole of the clamping sleeve and the through hole of the clamping groove ring and finally abuts against the outer cylindrical surface of the tool electrode, and the clamping groove ring and the clamping sleeve are connected and fixed together with the tool electrode and the blade. The connecting structure is easy to disassemble and assemble, and parts are convenient to replace.

The blade combined type rotary cathode electrolytic milling tool is characterized in that: the size, curvature and angle of the blade bodies of different blades can be adjusted and combined, and the number of the blades can be adjusted according to requirements; relevant parameters of the gas flow field can be adjusted through the adjustment so as to meet the processing requirement;

the blade combined type rotary cathode electrolytic milling tool is characterized in that: the blade body of a part of the blades is of a frame structure, and the surface of the blade body is fixedly provided with a developed filtering adsorption film.

The blade combined type rotary cathode electrolytic milling tool is characterized in that: the tool electrode is made of metal material, and the clamping groove ring, the blade, the clamping sleeve and the set screw are made of insulating material. This is to prevent parts other than the tool electrode from interfering with the electric field distribution between the tool electrode and the workpiece.

The electrolytic milling method by utilizing the blade combined type rotary cathode electrolytic milling tool is characterized by comprising the following steps of:

the tool electrode is connected with the negative pole of the power supply and vertically clamped on the main shaft of the machine tool, and the workpiece is connected with the positive pole of the power supply; electrolyte flows in from a liquid inlet hole at the top end of the tool electrode through the main shaft and then flows out from a liquid outlet hole at the bottom of the tool electrode to a processing area of a workpiece;

during machining, the tool electrode and the workpiece are electrified, and workpiece materials right below the tool electrode are dissolved under the electrolytic action to generate a large amount of insoluble electrolysis product particles. At the moment, the tool electrode rotates in the forward rotation direction to drive the impeller to rotate at a high speed to generate an upward gas flow field, so that the pressure intensity of the bottom area of the impeller is reduced, the difference between the internal pressure and the external pressure of the machining gap is increased, and the electrolyte in the machining gap is attracted; electrolyte flowing out of a liquid outlet hole at the bottom of the tool electrode is accelerated to diffuse towards the periphery or even the upper part along the radius direction of the impeller, and heat generated by processing and electrolysis product particles are carried and rapidly discharged; therefore, the updating speed of the electrolyte in the machining gap is accelerated, the cleanness of the electrolyte in the machining gap can be maintained all the time, higher conductivity is guaranteed, the efficient and continuous electrolysis is promoted, and the removal rate of the machined material is improved. The rapid discharge of electrolysis product particles can also avoid the pollution of the electrolysis product particles to the processing surface, and the surface quality of the processed workpiece is improved.

Compared with the conventional common pulsating flow field method and the conventional vibrating electrode method, the method disclosed by the invention does not need an additional complex device system and control program, and is convenient and efficient. The principle of the method is that the pressure outside the gap is reduced to be smaller than the atmospheric pressure, the resistance for discharging the electrolyte is reduced, and a periodic pulse flow field is not required to be provided without periodically increasing the gap. In addition, different from the forward rotation, when the tool electrode rotates in the reverse rotation direction, the provided downward gas flow field is weak, the electrolyte flow field cannot be influenced, but some gas clusters can be provided, so that a part of gas clusters are mixed into the electrolyte discharged from the gap, the conductivity of the electrolyte outside the machining gap is reduced, and the stray corrosion to a non-machining area can be reduced to a certain extent.

The invention has the following advantages:

the tool electrode has a simple structure, an upward gas flow field can be generated by means of the rotation of the cathode, no external device is needed to be added, the cost is low, and the operation is simple. The tool electrode is convenient to disassemble and assemble, the quantity, the size and the angle of the blades, the existence of the filtering adsorption film and other parameters can be quickly adjusted by replacing the blades, the rotating speed of the tool electrode can also be adjusted by a control system of a machine tool, and the machining flexibility is good.

2 the invention can drive the impeller to rotate to generate an upward gas flow field only by taking the rotation of the tool electrode as drive, and provides a low-pressure area which is far less than the atmospheric pressure for the electrolyte in the processing gap below the impeller, thereby accelerating the flow renewal of the electrolyte and promoting the rapid discharge of heat and products. Therefore, the high cleanliness and the high conductivity of the electrolyte in the machining gap can be kept, the continuous and efficient operation of the electrolysis is promoted, and the material removal rate of machining is improved. The rapid discharge of electrolysis product particles can also avoid the pollution of the electrolysis product particles to the processing surface, and the surface quality of the processed workpiece is improved.

3 the invention uses part of the blades with the filtering and adsorbing membranes, and the blades can intercept insoluble products of electrolytic processing to a certain degree, thus being beneficial to maintaining the cleanness of the electrolyte and the conductivity of the electrolyte. When the product on the filtering and adsorbing membrane is full, the filtering performance of the blade can be kept by replacing the filtering and adsorbing membrane, and the operation is convenient.

Drawings

FIG. 1 is a three-dimensional schematic view of the structure of a blade-combined rotating cathode;

FIG. 2 is an exploded view of the construction of a blade assembly type rotating cathode;

FIG. 3 is a schematic view of the blade installation process;

FIG. 4 is a schematic structural view of a snap ring;

fig. 5 is a schematic structural view of the ferrule;

FIG. 6 is a schematic view of a blade configuration;

FIG. 7 is a comparison of the presence or absence of upward gas flow field assisted electrolytic milling;

FIG. 8 is a schematic view of a blade assembly rotating cathode counter-rotating to provide an air mass to reduce electrolyte conductivity outside the process gap;

wherein the label names are: 1. a tool electrode; 2. a snap ring; 3. a blade; 4. a card sleeve; 5. tightening the screw; 6. a workpiece; 7. electrolyzing the product; 8. air mass; 9. forward rotation direction; 10. reversing the direction; 11. blade installation direction.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings:

as shown in fig. 1 and fig. 2, the blade combined type rotary cathode electrolytic milling tool provided by the invention comprises a tool electrode 1, a clamping groove ring 2, a blade 3, a clamping sleeve 4 and a set screw 5. The tool electrode 1 is a cylindrical electrode, and the bottom of the tool electrode is provided with a plurality of liquid outlet holes. The clamping groove ring 2 consists of an upper part and a lower part, the outer diameter of the cylindrical structure of the upper part is smaller than that of the cylindrical structure of the lower part, the whole clamping groove ring is of a boss-shaped circular ring structure, and the inner diameter of the clamping groove ring 2 is equal to the outer diameter of the cathode of the tool; a plurality of through holes are arranged on the surface of the cylindrical structure at the upper part of the clamping groove ring 2, and a plurality of grooves are arranged on the surface of the cylindrical structure at the lower part of the clamping groove ring 2 along the circumferential direction, as shown in fig. 4. The cutting sleeve 4 is of a circular ring structure, the center of the cutting sleeve is a stepped hole, the smaller inner hole diameter of the upper part of the cutting sleeve 4 is equal to the outer diameter of the cylindrical structure of the upper part of the clamping groove ring 2, and the larger inner hole diameter of the lower part of the cutting sleeve 4 is equal to the outer diameter of the cylindrical structure of the lower part of the clamping groove ring 2; the upper part of the cutting ferrule 4 is provided with threaded holes which are arranged in the same way as the through holes of the clamping groove ring 2, as shown in figure 5. Although the number of the through holes of the clamping groove ring 2 and the threaded holes of the clamping sleeve 4 are eight and the number of the grooves of the clamping groove ring 2 is twenty-four, the number of the through holes and the threaded holes can be adjusted according to different processing conditions and requirements. The blade 3 consists of an upper part and a lower part, wherein the upper part is a T-shaped blade handle, and the lower part is a blade body; the blade body of some of the blades 3 is a frame structure, and the surface of the blade body is fixed with a spread filtration adsorption membrane, as shown in fig. 6.

The installation process of the blade assembly type rotary cathode can be understood by the structural exploded view of fig. 2. Firstly, the T-shaped blade handle of the blade 3 is embedded into the groove on the side surface of the clamping groove ring 2 from top to bottom, and the horizontal part of the T-shaped blade handle is pressed on the step surface of the clamping groove ring 2, as shown in figure 3. Thus, the snap ring 2 and all the vanes 3 can constitute an impeller. The snap ring 2 is then fitted over the tool electrode 1 and keeps the bottom surface of the tool electrode 1 coplanar with the bottom surfaces of all the blades 3. Then the cutting sleeve 4 is sleeved on the clamping groove ring 2, the top surface of the cutting sleeve 4 is kept to be coplanar with the top surface of the clamping groove ring 2, and the step surface of the stepped hole of the cutting sleeve 4 is pressed on the top surface of the horizontal part of the T-shaped blade handle of the blade 3. Finally, a set screw 5 penetrates through a threaded hole of the clamping sleeve 4 and a through hole of the clamping groove ring 2 and finally abuts against the outer cylindrical surface of the tool electrode 1, the clamping groove ring 2 and the clamping sleeve 4 are connected, and the clamping groove ring 2, the clamping sleeve 4, the tool electrode 1 and the blade 3 are fixed together. The installation method is easy to disassemble and replace, convenient and fast, and the universality replaceability of each part is greatly enhanced.

In view of the above-mentioned combined installation method, the shape, curvature and angle of the blade bodies of different blades 3 can be adjusted, and the number of the blades 3 can be adjusted according to the requirement. Even the blade body of part of the blades 3 can be a frame structure, and the side surfaces of the blade body are covered with filtering and adsorbing membranes, as shown in fig. 6, so that the function of filtering and adsorbing granular or flocculated electrolysis products 7 is realized to a certain extent.

As shown in fig. 7, the electrolytic milling method using the blade-combined rotary cathode electrolytic milling tool includes:

fig. 7 is a comparison of the presence or absence of upward gas flow field assisted electrolytic milling, taken perpendicular to the feed direction, and fig. 7 (a) shows the tool electrode 1 without rotation and therefore without gas flow field, i.e. a typical electrolytic milling process. FIG. 7 (b) shows the electrolytic milling process using the blade combination type rotating cathode. During the electrolytic milling process, the material of the workpiece 6 right below the tool electrode 1 is dissolved under the electrolytic action and generates a large amount of insoluble electrolysis product 7 particles, namely black small dots in the figure. Compared with the situation that the tool electrode 1 does not rotate (fig. 7 (a)), the tool electrode 1 in fig. 7 (b) rotates in the forward direction 9 to drive the impeller to rotate at a high speed to generate an upward gas flow field, so that a rising gas mass 8 in the impeller can be seen continuously, the pressure of the bottom area of the impeller is reduced, the difference between the internal pressure and the external pressure of the machining gap is increased, and the electrolyte in the machining gap is attracted. The reduction of pressure cooperates the centrifugal force of impeller, can drive the electrolyte in the regional clearance of processing and flow out the processing clearance to the diffusion is accelerated all around even the top of impeller, carries heat and 7 granules of electrolysis product and discharges fast, maintains the purity of electrolyte in the clearance, guarantees higher conductivity, promotes the high efficiency of electrolysis and goes on fast. As shown in the comparative figure, in the region between the impeller bottom surface and the workpiece 6 surface after the electrolyte in fig. 7 (a) flows out from the machining gap, the flow rate rapidly decreases, the flow line changes from three to two to one, and the particles of the electrolysis products 7 are not sufficiently discharged, and particularly, many particles of the electrolysis products 7 remain in the machining gap, which is the case in the general electrolytic milling machining. In the region between the bottom of the impeller and the surface of the workpiece 6 in fig. 7 (b), the liquid flow lines are more dense than those in fig. 7 (a), and three flow lines can be maintained all the time, wherein even a part of the liquid flow lines slightly upwarp no longer is a pure horizontal line; the distribution of the particles of the electrolysis product 7 in fig. 7 (b) also increases from the inside to the outside, and the particles of the electrolysis product 7 in the machining gap particularly immediately below the tool electrode 1 are significantly reduced.

FIG. 8 is a schematic diagram of a blade assembly rotating cathode counter-rotating to provide an air mass to reduce electrolyte conductivity outside the process gap. Compared with the situation that the tool electrode 1 does not rotate (fig. 7 (a)), the tool electrode (1) rotates in the reverse direction (10) in fig. 8, the impeller is driven to rotate, a downward gas flow field is generated, and compared with fig. 7 (b), it is obvious that the downward gas flow field is weak, and the electrolyte flow field cannot be influenced at all. It is possible to provide some of the gas mass 8 downwards so that a part of the gas mass 8 is mixed into the electrolyte exiting the machining gap, which reduces the conductivity and to some extent the stray corrosion on the non-machined areas.

The invention can effectively improve the flow field of the electrolyte, accelerate the flow renewal of the electrolyte and the quick discharge of heat and products generated by processing, keep the high cleanliness and the high conductivity of the electrolyte in the processing gap and promote the continuous and efficient operation of the electrolysis. The above description should not be construed as limiting the present patent. It should be noted that several improvements can be made without departing from the inventive concept, which shall all fall within the protection of the present patent.