CN110465711B

CN110465711B - Ultrasonic enhanced electrochemical grinding device

Info

Publication number: CN110465711B
Application number: CN201910787938.5A
Authority: CN
Inventors: 杨绿; 张进; 吴怀超; 王玥; 赵丽梅; 钟鑫; 樊艳娥
Original assignee: Guizhou University
Current assignee: Guizhou University
Priority date: 2019-08-26
Filing date: 2019-08-26
Publication date: 2021-11-26
Anticipated expiration: 2039-08-26
Also published as: CN110465711A

Abstract

The invention discloses an ultrasonic enhanced electrochemical grinding device which comprises a conductive grinding wheel spindle, an XZ servo shaft, an electrolyte supply system, a grinding torque detection device, an adjustable electrolytic power supply, a controllable ultrasonic generator and the like. The grinding wheel spindle is driven by a servo motor through synchronous belt transmission, and is supported by an angular contact ball ceramic bearing in triple matching; the XZ axis is driven by a servo motor, a precise ball screw pair is used for transmission, and a grating ruler is additionally arranged to form a closed-loop detection system; the positive pole of the power supply is directly connected with the tip of the workpiece, and the negative pole is connected with the grinding wheel shaft through the electric brush; the ultrasonic transducer is installed in contact with the tailstock center, ultrasonic waves emitted by the transducer are transmitted to a workpiece through the tailstock center, under the action of ultrasonic cavitation, sharpening of the grinding wheel is achieved, cracks in an electrochemical reaction film are promoted to be initiated and extended, and the grinding efficiency is improved. By changing parameters such as ultrasonic frequency, current magnitude, grinding wheel rotating speed and the like, a grinding process for improving the grinding efficiency and quality of the difficult-to-grind material is explored.

Description

Ultrasonic enhanced electrochemical grinding device

Technical Field

The invention relates to the field of grinding processing, in particular to a grinding device for processing difficult-to-grind materials by using an ultrasonic and electrochemical composite grinding method.

Background

Electrochemical grinding is a special processing technology which utilizes the electrolysis principle to apply the electrolysis to mechanical grinding, and the realization method is that the anode of an electrolysis power supply is connected with a workpiece as the anode, and the cathode of the electrolysis power supply is connected with an electric grinding wheel as the cathode. During the grinding process, the grinding fluid is supplied and simultaneously electrolytic action is generated, and electrolytic products are continuously removed under the electrolytic action and the grinding of the grinding wheel, so that the purpose of grinding is achieved. Ultrasonic grinding is a processing technique in which grinding wheels or workpieces are forced to be in a vibration state with a certain frequency by using ultrasonic waves during grinding. The mechanism of ultrasonic grinding is to generate ultrasonic vibration to force the abrasive suspension to impact and polish the surface to be processed at high speed so as to shape the workpiece.

In the prior art, a grinding-assisted electrochemical discharge machining tool and method (publication No. CN102398193B) applied by hong kong nursing university discloses a grinding-assisted electrochemical discharge machining tool including an ECDM electrode for performing electric discharge machining on a workpiece and electrochemically generating hydrogen bubbles to assist the electric discharge machining; wherein the tool further comprises an abrasive layer disposed on the ECDM electrode, the abrasive layer configured to remove recast material formed around a spark pit of a workpiece during a spark etch. The scheme can increase the removal rate of the material when the material which is difficult to process is processed, and better surface quality is obtained.

An internal channel ultrasonic vibration assisted internal spraying type electrolytic grinding system and method (with the publication number of CN108581100A) applied by Shandong university disclose an internal channel ultrasonic vibration assisted internal spraying type electrolytic grinding system and method, the system mainly comprises: the device comprises a motion control device, a current detection control device, an electrolyte circulating device, an ultrasonic vibration device and an internal injection type tubular conductive grinding head. The motion control device realizes the control of the high-speed rotation of the main shaft and the feeding stability; the current detection control device detects the current in the machining process in real time and controls the generation of the abrupt current; the electrolyte circulating device realizes the liquid supply, filtration and recycling of the electrolyte; the ultrasonic vibration device realizes that the conductive grinding head quickly removes a passive film on the surface of a workpiece under the action of ultrasonic cavitation of electrolyte, and enhances electrochemical reaction; the internal-spraying tubular conductive grinding head avoids the turbulence effect between the grinding head and the workpiece gap in the machining process, and keeps the flow field of the electrolyte stable.

Further, an ultrasonic-reinforced electrochemical corrosion-resistant pipe (publication No. 208474782U) applied by gazette corrosion-resistant insulating material ltd, sichuan, provides an ultrasonic-reinforced electrochemical corrosion-resistant pipe including: the pipeline comprises a multilayer anti-corrosion structure arranged inside and outside a pipeline, wherein a ceramic isolation layer is added on the inner wall of a steel pipe; the steel pipe outer wall sets up one deck ultrasonic wave anticorrosive coating, and the ultrasonic wave anticorrosive coating sets up the strong layer outward, and through the mode that combines together, the anticorrosive work of better completion pipeline can be through the anticorrosive and the anticorrosive mode that combines together of electrochemistry of physics, improves steel construction pipeline's life, can play certain steel pipe repairing simultaneously.

The technical scheme has certain inspiration on electrochemical grinding or ultrasonic grinding, but for materials which are difficult to grind, such as high-speed steel, hard alloy and the like, the traditional grinding process is difficult to meet the requirements on precision and has low grinding efficiency, so that a novel processing process needs to be researched to improve the grinding efficiency of the materials which are difficult to grind. The existing electrochemical grinding or ultrasonic grinding test bed adopts a single grinding technology to research a machining process, or the combination of the electrochemical grinding and the ultrasonic grinding is still not ideal enough, the improvement on the grinding efficiency is still limited, and the actual production requirement is often difficult to meet.

Disclosure of Invention

In order to solve the problem that the grinding efficiency still cannot meet the actual production requirement due to the fact that a single processing technology is adopted for grinding of the difficult-to-grind materials in the prior art, the invention provides a grinding device adopting ultrasonic enhanced electrochemical grinding, which is test equipment with electrochemical grinding and ultrasonic grinding functions, and can improve the grinding efficiency and the grinding quality of the difficult-to-grind materials to a certain extent.

The technical scheme adopted by the invention for solving the technical problems is as follows:

an ultrasonic enhanced electrochemical grinding device comprises a machine body, a cross-shaped workbench, a workpiece table, a grinding wheel device and an electrochemical working device. The machine body is divided into an upper part and a lower part, the upper part is a grinding platform, and the lower part is provided with a control box and other required equipment.

The cross workbench comprises an X-direction sliding table and a Z-direction sliding table, the Z-direction sliding table is supported by a Z-direction ball screw and a guide rail mounting table, the Z-direction ball screw and the guide rail mounting table are mounted on the machine body, a Z-direction ball screw and a Z-direction rolling guide rail are mounted on the machine body, and the Z-direction ball screw and the Z-direction servo motor are connected through a third coupler. The Z-direction sliding table is provided with a grating ruler, so that the transmission precision of the Z-direction sliding table is ensured.

Furthermore, the X-direction sliding table is supported by an X-direction ball screw and a guide rail mounting table, the X-direction ball screw and the guide rail mounting table are mounted on the Z-direction sliding table, the X-direction ball screw and the X-direction rolling guide rail are mounted on the Z-direction sliding table, and the X-direction ball screw and the X-direction servo motor are connected through a third coupler. The X-direction sliding table is provided with a grating ruler, so that the transmission precision of the X-direction sliding table is ensured.

Furthermore, a workpiece table is installed on the X-direction sliding table, a workpiece driving motor installation plate is installed at one end of the workpiece table, a driving motor of a workpiece is installed on the installation plate, the driving motor is connected with a third coupler, the third coupler is connected with a workpiece rotating shaft, the workpiece rotating shaft is installed on a bearing seat, the other end of the workpiece rotating shaft is connected with a three-jaw chuck through a connecting flange, and the three-jaw chuck is used for clamping the workpiece to be machined. And a first grinding fluid collecting box is arranged below the workpiece. One end of the workpiece is clamped by the three-jaw chuck, the other end of the workpiece is tightly propped by a tail seat with a tip, and the tail seat is arranged on the X-direction sliding table and can move in the axial direction of the workpiece to adjust the distance for installing the workpiece. The tailstock is connected with an ultrasonic transducer, and ultrasonic waves emitted by the ultrasonic transducer are transmitted to the workpiece through the tailstock center.

Furthermore, the grinding wheel device is fixed on the machine body and consists of a grinding wheel spindle servo motor, wherein the grinding wheel spindle servo motor is installed on the back of the machine body and is connected with a synchronous belt wheel through a synchronous belt, and the power is transmitted by the synchronous belt. The belt wheel is fixedly connected with a main shaft of the belt wheel through a set screw, the main shaft is supported by a second angular contact ball bearing, the other end of the main shaft is connected with a second coupler, and a torque sensor is connected between the second coupler and the first coupler. The first coupling is connected with a grinding wheel spindle, and the grinding wheel spindle is supported by a first angular contact ball bearing. The grinding wheel is arranged on the grinding wheel spindle and is fixed by a flange plate, and the grinding wheel is positioned above the first grinding fluid collecting box.

Furthermore, the electrochemical working device comprises an electrolyte supply system, an electrolytic power supply, a conductive grinding wheel (cathode) and a workpiece (anode). The anode of the power supply is connected with the tailstock center, and the cathode of the power supply is connected with the conductive grinding wheel shaft through the electric brush. The electrolyte supply system comprises a second grinding fluid collecting box, a booster pump, an electro-hydraulic proportional speed regulating valve, a sprayer and a pipeline, wherein the second grinding fluid collecting box is placed at the lower half part of the machine body and can be connected with a filtering system, a temperature control system and the like to process the collected grinding fluid, the booster pump is connected below the machine body, the booster pump can transmit the processed grinding fluid to the electro-hydraulic proportional speed regulating valve through the pipeline, and the electro-hydraulic proportional speed regulating valve is installed above the machine body. The electro-hydraulic proportional speed regulating valve is connected with a grinding fluid spray head through a pipeline, and the flow of the electrolyte can be continuously regulated through the electro-hydraulic proportional speed regulating valve. The grinding fluid nozzle is mounted on the XZ shaft sliding table, and applies the grinding fluid when the grinding wheel is subjected to grinding processing.

Compared with the prior art, the grinding wheel spindle of the device is driven by an alternating current servo motor, synchronous belt transmission is adopted, and the grinding wheel spindle is supported by the triple-matched angular contact ball bearing, so that the high rigidity and high rotation precision of the spindle can be ensured; the cross workbench is driven by an alternating current servo motor, is driven by a precise ball screw pair, and is additionally provided with a grating ruler to form a closed-loop detection system so as to ensure the feeding speed and precision; the ultrasonic transducer probe is contacted with the tailstock center, and the ultrasonic wave emitted by the ultrasonic transducer is directly transmitted to the workpiece through the tailstock center so as to realize ultrasonic enhanced electrochemical grinding. The grinding process for improving the grinding efficiency and quality of the difficult-to-grind material is explored by changing the grinding consumption such as ultrasonic frequency, current, flow of grinding liquid, rotating speed of a grinding wheel, feeding amount and the like.

Drawings

FIG. 1 is a schematic diagram of an embodiment of an ultrasonically enhanced electrochemical grinding apparatus in accordance with the present invention;

FIG. 2 is a front view of an ultrasonically enhanced electrochemical grinding apparatus in accordance with an embodiment of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2 provided by an embodiment of the present invention;

FIG. 4 is a left side view of FIG. 2 provided by an embodiment of the present invention;

FIG. 5 is a rear view of FIG. 2 provided by an embodiment of the present invention;

FIG. 6 is a top view of FIG. 2 provided in accordance with an embodiment of the present invention;

description of reference numerals: 1-X direction ball screw and guide rail installation platform, 2-X direction ball screw, 3-X direction rolling guide rail, 4-workpiece platform, 5-installation plate, 6-workpiece driving motor, 7-third coupling, 8-CBN grinding wheel, 9-electro-hydraulic proportional speed regulating valve, 10-flange plate, 11-bearing seat, 12-grinding wheel spindle, 13-first grinding fluid collection box, 14-first angular contact ball bearing, 15-first coupling, 16-torque sensor, 17-second coupling, 18-belt wheel spindle, 19-second angular contact ball bearing, 20-synchronous belt wheel, 21-set screw, 22-X direction worktable servo motor, 23-Z direction rolling guide rail, 24-Z direction ball screw and guide rail installation platform, 25-grinding wheel spindle servo motor, 26-Z direction workbench servo motor, 27-second grinding fluid collecting box, 28-control box, 29-booster pump, 30-machine body, 31-synchronous belt, 32-ultrasonic transducer, 33-Z direction ball screw, 34-tailstock, 35-grating ruler, 36-three-jaw chuck, 37-connecting flange, 38-workpiece rotating shaft, 39-filtering system, 40-temperature control system, 41-grinding fluid spray head, 42-electric brush and 43-electrolytic power supply.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

In the description of the present invention, it is to be understood that the terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the drawings only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1, fig. 2, fig. 4, fig. 5 and fig. 6, fig. 1 is a basic schematic diagram of an ultrasonically enhanced electrochemical grinding apparatus, fig. 2 is a front view of the ultrasonically enhanced electrochemical grinding apparatus, fig. 4 is a left side view of fig. 2, fig. 5 is a rear view of fig. 2, and fig. 6 is a top view of fig. 2.

The ultrasonic enhanced electrochemical grinding device mainly comprises a machine body 30, a cross workbench, a workpiece table 4, a grinding wheel device and an electrochemical working device (not all of which are shown in the figure, but do not influence the understanding of the technical personnel in the field).

The machine body 30 is divided into an upper part and a lower part, the upper part is used as a platform for carrying grinding processing equipment and other parts, and the box body space of the lower part can be used for placing required equipment such as a control box 28, a grinding fluid circulating treatment system and the like.

Referring to fig. 2 and 5, the cross table includes an X-direction sliding table and a Z-direction sliding table. The Z-direction ball screw and rail mount 24 is mounted on the body 30 of the test stand, and the Z-direction ball screw 33 and the Z-direction rolling rail 23 are mounted thereon. The Z-direction sliding table is arranged on the Z-direction ball screw 33 and the Z-direction rolling guide rail 23, the Z-direction workbench servo motor 26 is connected with the Z-direction ball screw 33 through the third coupler 7, and the Z-direction sliding table is driven by the Z-direction workbench servo motor 26 to move along the axial direction, so that the workpiece can move along the axial direction. In addition, a grating scale 35 is installed on the Z-direction sliding table, so that the transmission precision of the Z-direction ball screw 33 is guaranteed.

Referring to fig. 2 and 4, the X-direction ball screw and guide rail mounting table 1 is mounted on a Z-direction slide table on which an X-direction ball screw 2 and an X-direction rolling guide rail 3 are mounted, the X-direction slide table is mounted on the X-direction ball screw 2 and the X-direction rolling guide rail 3, an X-direction table servo motor 22 is connected to the X-direction ball screw 2 through a third coupling 7, and the X-direction table servo motor 22 drives the X-direction slide table to move in the grinding wheel direction, so that a workpiece can be fed in the grinding wheel direction. In addition, the X-direction sliding table is provided with a grating ruler 35, so that the transmission precision of the X-direction ball screw 2 is ensured.

Referring to fig. 2 and 6, a workpiece table 4 is mounted on the X-slide table, a mounting plate 5 of a workpiece driving motor 6 is mounted at one end of the workpiece table 4, and the workpiece driving motor 6 is fixed on the mounting plate 5. The workpiece driving motor 6 is connected with the third coupling 7, the third coupling 7 is connected with a workpiece rotating shaft 38, the workpiece rotating shaft 38 is installed on the bearing seat 11, the other end of the workpiece rotating shaft is connected with the three-jaw chuck 36 through the connecting flange 37, the workpiece is fixed by the three-jaw chuck 36 and the ejector pins of the tailstock 34 and is controlled by the workpiece driving motor 6, and rotation speed regulation of the workpiece are achieved. A first grinding fluid collecting box 13 is arranged below the workpiece, and waste liquid generated during grinding is stored in the first grinding fluid collecting box 13. The tailstock 34 is mounted on the X-direction slide table, and is movable in the workpiece axis direction to adjust the distance of mounting the workpiece. The tailstock 34 is connected to an ultrasonic transducer 32, the ultrasonic waves being conducted by the solid body to reduce the attenuation thereof. The ultrasonic wave emitted by the ultrasonic transducer 32 is directly transmitted by the ejector pin of the tailstock 34 and then transmitted to the workpiece, so that ultrasonic vibration is generated, the grinding material suspension is forced to continuously impact and polish the processed surface at a high speed to form the workpiece, and the ultrasonic reinforced electrochemical grinding is realized.

Referring to fig. 2, 3, 5 and 6, a grinding wheel unit is fixed above a machine body 30, and the grinding wheel unit is composed of a grinding wheel spindle servo motor 25, which is installed on the back of the machine body 30 and connected with a synchronous pulley 20 through a synchronous belt 31, and the grinding wheel is driven to rotate by the power transmitted by the synchronous belt 31, so as to grind a workpiece. The synchronous belt wheel 20 is connected with a belt wheel main shaft 18 through a set screw 21, the main shaft is supported by a second angular contact ball bearing 19, the other end of the main shaft is connected with a second coupler 17, a torque sensor 16 is connected between the second coupler 17 and the first coupler 15, the torque transmitted by the grinding wheel main shaft 12 can be detected in real time, and therefore the rotating speed of the CBN grinding wheel 8 can be regulated and controlled. The first coupler 15 is connected with the grinding wheel spindle 12, and the grinding wheel spindle 12 is supported by the triple-matched angular contact ball bearing 14, so that high rigidity and high rotation precision of the spindle can be guaranteed. The CBN grinding wheel 8 is arranged on a grinding wheel spindle 12 and is fixed by a flange plate 10. The CBN grinding wheel 8 is positioned above the first grinding fluid collecting box 13, grinding waste fluid generated during grinding is collected by the first grinding fluid collecting box 13, the first grinding fluid collecting box 13 and the second grinding fluid collecting box 27 can be connected through a pipeline, and the collected waste fluid can be transmitted to the second grinding fluid collecting box 27 and recycled after treatment.

Referring to fig. 1, 2 and 5, the electrochemical working device (not fully shown) includes a second grinding fluid collecting tank 27 disposed at a lower half portion of the machine body 30, the collected grinding fluid is treated by a pipeline connecting a filtering system 39, a temperature control system 40 and the like, the treated grinding fluid is further connected to a booster pump 29 below the machine body 30 by a pipeline, the booster pump 29 transfers the treated grinding fluid to an electro-hydraulic proportional speed regulating valve 9 by a pipeline, and the electro-hydraulic proportional speed regulating valve 9 is mounted above the machine body 30. The electro-hydraulic proportional speed regulating valve 9 can control the output flow of the grinding fluid by controlling the input micro current, is convenient to control, and can realize continuous adjustment of the flow speed of the grinding fluid. The electro-hydraulic proportional speed regulating valve 9 is connected with a grinding fluid spray head 41 through a pipeline; the anode of the power supply is connected with the tailstock center, the cathode is connected with the conductive grinding wheel shaft 12 through the electric brush 42, and the power supply is realized by the electrolytic power supply 43, so that an electric field can be applied to the grinding fluid and the workpiece, and the electrochemical grinding is realized. The grinding fluid nozzle 41 is attached to the XZ table 4, and applies a grinding fluid when the CBN grinding wheel 8 is ground.

Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.

Claims

1. An ultrasonic enhanced electrochemical grinding device is realized by connecting the anode of an electrolytic power supply with a workpiece as an anode and connecting the cathode of the electrolytic power supply with a conductive grinding wheel as a cathode, and is characterized in that: comprises a machine body (30), a cross-shaped workbench, a workpiece table (4), a grinding wheel device and an electrochemical working device; the machine body (30) is divided into an upper part and a lower part, the upper part is a grinding platform, and the lower part is provided with required equipment including a control box (28); a grinding wheel spindle (12) of the grinding wheel device is driven by an alternating current servo motor and is driven by a synchronous belt (31), and the grinding wheel spindle (12) is supported by an angular contact ball bearing in triple matching; a torque sensor (16) is arranged between the belt wheel main shaft (18) and the grinding wheel main shaft (12) to realize grinding force measurement; the cross workbench is driven by an alternating current servo motor, is driven by a precise ball screw pair, and is additionally provided with a grating ruler (35) to form a closed-loop servo system; the electrochemical working device is composed of a grinding fluid spray head (41), an electrolytic power supply (43), a conductive grinding wheel as a cathode and an anode workpiece; wherein, the positive pole of the electrolytic power supply (43) is connected with the tailstock center, and the negative pole is connected with the grinding wheel spindle (12) through the electric brush (42); the ultrasonic transducer (32) is contacted with the top of the tailstock (34), and the ultrasonic wave emitted by the ultrasonic transducer (32) is transmitted to the workpiece through the top of the tailstock (34).

2. The ultrasonically enhanced electrochemical grinding apparatus of claim 1, wherein: the cross-shaped workbench comprises an X-direction sliding table and a Z-direction sliding table, the Z-direction sliding table is supported by a Z-direction ball screw and guide rail mounting table (24), the Z-direction ball screw and guide rail mounting table (24) is mounted on the machine body (30), and a Z-direction ball screw (33) and a Z-direction rolling guide rail (23) are mounted on the Z-direction ball screw and guide rail mounting table (24); the Z-direction ball screw (33) is connected with the Z-direction servo motor (26) through a third coupling (7); and a grating ruler (35) is arranged on the Z-direction sliding table to ensure the transmission precision.

3. The ultrasonically enhanced electrochemical grinding apparatus of claim 2, wherein: the X-direction sliding table is supported by an X-direction ball screw and a guide rail mounting table (1), the X-direction ball screw and the guide rail mounting table (1) are mounted on the Z-direction sliding table, and an X-direction ball screw (2) and an X-direction rolling guide rail (3) are mounted on the X-direction ball screw and the guide rail mounting table (1); the X-direction ball screw (2) is connected with the X-direction servo motor (22) through a third coupler (7); and a grating ruler (35) is arranged on the X-direction sliding table to ensure the transmission precision of the X-direction sliding table.

4. The ultrasonically enhanced electrochemical grinding apparatus of claim 2, wherein: the X-direction sliding table is provided with a workpiece table (4), one end of the workpiece table (4) is provided with a mounting plate (5) of a workpiece driving motor (6), the workpiece driving motor (6) is mounted on the mounting plate (5), the workpiece driving motor (6) is connected with a third coupler (7), the third coupler (7) is connected with a workpiece rotating shaft (38), the workpiece rotating shaft (38) is mounted on a bearing seat (11), the other end of the workpiece rotating shaft (38) is connected with a three-jaw chuck (36) through a connecting flange (37), and the three-jaw chuck (36) is used for clamping a workpiece to be processed; a first grinding fluid collecting box (13) is arranged below the workpiece; one end of the workpiece is clamped by a three-jaw chuck (36), and the other end of the workpiece is tightly propped by a tail seat (34) top; the tailstock (34) is installed on the X-direction sliding table and can move in the axial direction of the workpiece to adjust the distance for installing the workpiece.

5. The ultrasonically enhanced electrochemical grinding apparatus of claim 2, wherein: the grinding wheel device is fixed on a machine body (30) and comprises a CBN grinding wheel (8) and a grinding wheel spindle servo motor (25), wherein the grinding wheel spindle servo motor (25) is installed on the back of the machine body (30) and is connected with a synchronous belt wheel (20) through a synchronous belt (31), and power is transmitted by the synchronous belt (31); the synchronous belt wheel (20) is connected with a belt wheel main shaft (18) through a set screw (21), the belt wheel main shaft (18) is supported by a second angular contact ball bearing (19), the other end of the belt wheel main shaft (18) is connected with a second coupling (17), and a torque sensor (16) is connected between the second coupling (17) and the first coupling (15); the first coupler (15) is connected with the grinding wheel spindle (12), and the grinding wheel spindle (12) is supported by a first angular contact ball bearing (14); the CBN grinding wheel (8) is arranged on a grinding wheel spindle (12) and is fixed by a flange plate (10); the CBN grinding wheel (8) is positioned above the first grinding fluid collecting box (13).

6. The ultrasonically enhanced electrochemical grinding apparatus of claim 2, wherein: the electrochemical working device comprises a second grinding fluid collecting box (27), the second grinding fluid collecting box (27) is placed on the lower half part of the machine body (30) and is connected with a device comprising a filtering system (39) and a temperature control system (40) to process the collected grinding fluid, and then is connected with a booster pump (29) below the machine body (30); the booster pump (29) transfers the treated grinding fluid to the electro-hydraulic proportional speed regulating valve (9) through a pipeline, and the electro-hydraulic proportional speed regulating valve (9) is arranged above the machine body (30); the electro-hydraulic proportional speed regulating valve (9) is connected with a grinding fluid spray head (41) through a pipeline, the grinding fluid spray head (41) is installed on the machine body (30) or the workpiece table (4), and grinding fluid is applied when the grinding wheel is subjected to grinding processing.