Composite electrolytic grinding machine tool and composite electrolytic grinding machining method

Abstract

The invention relates to a composite electrolytic grinding machine tool, in particular to a composite electrolytic grinding machine tool and a composite electrolytic grinding machining method. An electrolytic grinding head is arranged in a protective cover of the machine tool body; a conductive assembly is arranged on the outer side of the protective cover, and one end of the conductive assembly abuts against the electrolytic grinding head. An X-Y-Z three-axis workbench located below the electrolytic grinding head is arranged on the machine tool body, a workpiece fixing tool, a laser generator and a grinding wheel dresser are arranged on the X-Y-Z three-axis workbench face, and the laser generator and the grinding wheel dresser are located on one side of the workpiece fixing tool. The conductive workpiece fixing tool is connected with the positive electrode of the direct-current power source through a wire, and the conductive assembly is connected with the negative electrode of the direct-current power source through a wire. The machine tool body is provided with a cooling liquid box and a cooling liquid pump, a liquid inlet of the cooling liquid pump is communicated with the interior of the cooling liquid box, and a universal liquid spraying pipe is arranged at a liquid outlet of the cooling liquid pump. The laser electrolytic machining mode is integrated for grinding wheel dressing, and online forming dressing of the grinding wheel and electrolytic grinding of parts are achieved.

Description

Technical Field

[0001] The invention relates to an electrolytic grinding machine tool, in particular to a composite electrolytic grinding machine tool and a composite electrolytic grinding processing method. Background Art

[0002] With the industrial upgrading of modern manufacturing industry and the rapid development of aerospace, semiconductor, new energy, medical and other industries, the application demand for difficult-to-process materials such as high strength, high hardness, heat sensitivity, brittleness, etc. is increasing. At the same time, the requirements for processing shape, precision and efficiency are also getting higher and higher. However, the existing processing methods mainly rely on traditional processes, which are time-consuming and labor-intensive and difficult to meet market demand. Therefore, the market urgently needs a composite machine tool that can achieve efficient and high-precision processing. However, it is extremely technically difficult to achieve complex shape processing, high-precision processing and efficient processing on one machine tool at the same time, and it has been difficult to break through for a long time.

[0003] To address the above problems, existing solutions mainly include diamond grinding wheels, CBN high-speed grinding, laser processing, electrolytic grinding, etc. However, these technologies still have many limitations in practical applications:

[0004] Diamond grinding wheel and CBN high-speed grinding: Although high-speed grinding with diamond or CBN grinding wheels is a widely used technology, CBN and diamond grinding wheels are superhard materials with extremely high hardness, and the grinding line speed usually needs to reach more than 80 m / s. Such grinding wheels are usually bonded or sintered with high-strength binders, making it almost impossible to achieve online shaping and trimming on machine tools. Especially in the shaping and trimming and grinding applications of complex contours, the existing technology seems powerless and can only process some simple-shaped parts, and cannot meet the efficient and high-precision processing requirements of complex-shaped parts.

[0005] Laser processing technology: Laser processing is currently limited by the power of the laser generator. Laser processing technology can only process general materials, general precision, and parts of a certain thickness, size, and hardness. Therefore, laser processing technology is mainly used in sheet metal cutting and other applications with low precision requirements, and cannot make a difference in high-precision, special materials and other fields.

[0006] Electrolytic grinding technology: Currently, it is mainly non-contact electrolytic grinding, which mainly transmits 90-150V voltage to the electrode, uses non-contact discharge and reserves a gap of 0.1-0.3mm between the positive and negative electrodes. After the electrolyte flows in, an electrolytic action is generated to achieve an electrochemical effect, causing the surface tissue of the grinding wheel to decompose and achieve the sharpness of the grinding wheel. The grinding wheel is then used to perform conventional physical property processing on the parts. However, this electrolytic grinding technology is only suitable for trimming simple-shaped grinding wheels because the positive and negative electrodes are in a non-contact state. It cannot achieve the contour shaping and trimming of the grinding wheel and the electrolytic effect between the grinding wheel and the processed parts, resulting in a processing efficiency that is almost the same as that of conventional processing methods. At the same time, continuous electrolysis with high voltage and high current is required during grinding, which greatly reduces the durability of the grinding wheel. After grinding, a large number of burrs will be generated on the grinding surface of the part and cannot be eliminated. The burrs can only be eliminated by adding conventional sandblasting processes or other processes. This will not only change the precision size of the parts, but also increase the number of secondary defective products, which will not only increase the manufacturing cost but also increase the difficulty and efficiency of part manufacturing.

[0007] Therefore, there is an urgent need to provide a composite electrolytic grinding machine tool and a composite electrolytic grinding processing method to solve the above problems, realize online dressing of the grinding wheel and efficient and high-precision processing of parts. Summary of the invention

[0008] The purpose of the present invention is to solve the technical problem that the existing grinding machine tools cannot realize the online dressing of the grinding wheel and the efficient and high-precision processing of parts, and to provide a composite electrolytic grinding machine tool and a composite electrolytic grinding processing method.

[0009] To solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0010] A composite electrolytic grinding machine tool comprises a machine tool body with a controller, a protective cover is arranged on one side of the machine tool body close to the end of the machine tool spindle, and an electrolytic grinding head with a grinding wheel installed on the machine tool spindle is arranged in the protective cover;

[0011] A conductive component is provided on the outer side of the protective cover and is located on the extension line of the central axis of the machine tool spindle. One end of the conductive component penetrates the protective cover and abuts against the electrolytic grinding head.

[0012] The machine tool body is provided with an XYZ three-axis worktable located below the electrolytic grinding head, a workpiece fixing fixture capable of conducting electricity and used for fixing the workpiece is provided in the middle of the XYZ three-axis worktable, and a laser generator and a grinding wheel dresser are located on the same side of the workpiece fixing fixture or on both sides of the workpiece fixing fixture;

[0013] The grinding wheel dresser and the workpiece fixing fixture are connected to the positive electrode of the DC power supply through a positive wire, and the conductive component is connected to the negative electrode of the DC power supply through a negative wire;

[0014] The machine tool body is provided with a coolant tank and a coolant pump, the coolant pump has a liquid inlet connected to the interior of the coolant tank, and a universal liquid spray pipe is provided at the liquid outlet of the coolant pump;

[0015] The grinding wheel dresser, laser generator, XYZ three-axis workbench, machine tool body, coolant pump and direct current power supply are all connected to the controller.

[0016] Furthermore, the electrolytic grinding head comprises a stepped flange, a small end of the flange is provided with a connecting portion, and a nut is sleeved on the connecting portion;

[0017] A grinding wheel fixing fixture is sleeved on the small end of the flange, and the grinding wheel is fixed in the grinding wheel fixing fixture;

[0018] A conductive seat is provided on one side of the grinding wheel fixing fixture close to the nut, and an insulating component is provided between the conductive seat, the grinding wheel fixing fixture and the flange;

[0019] The conductive seat is in contact with the conductive component at the middle of the side away from the grinding wheel fixing fixture;

[0020] The large end of the flange is provided with a machine tool spindle mounting hole, a connecting threaded rod is arranged in the machine tool spindle mounting hole, and the connecting threaded rod is connected to the machine tool spindle.

[0021] Furthermore, the conductive assembly includes a fixing seat mounted on the protective cover, and one end of the fixing seat close to the electrolytic grinding head penetrates the protective cover;

[0022] An insulating sleeve is installed in the middle of the fixing seat;

[0023] A stepped hole is provided in the middle of the insulating sleeve, an electrode adapted to the stepped hole is slidably installed in the stepped hole, the large end of the electrode abuts against the electrolytic grinding head, a spring is sleeved on the small end of the electrode, and the two ends of the spring abut against the large end face of the stepped hole and the large end face of the electrode respectively;

[0024] A clamping screw is threadedly mounted on the small end surface of the electrode, a gasket is sleeved on the stud of the clamping screw, and the negative electrode wire is fixed between the gasket and the nut of the clamping screw.

[0025] Further, the insulating assembly includes a first insulating ring sleeved on the small end of the flange;

[0026] The outer side of the first insulating ring is sleeved with a second insulating ring and a third insulating ring distributed on both sides of the grinding wheel fixing fixture, and an insulating cover is provided on a side of the second insulating ring away from the third insulating ring.

[0027] Further, the grinding wheel fixing fixture comprises a first fixing plate and a second fixing plate sleeved on the outside of the first insulating ring;

[0028] The first fixed disk is provided with an annular placement groove, the grinding wheel is placed in the placement groove, and the first fixed disk, the grinding wheel and the second fixed disk are connected by a plurality of screws evenly distributed around the circumference.

[0029] Furthermore, an annular groove is provided on an end surface of the nut away from the first insulating ring, and a plurality of balancing blocks are installed in the annular groove by fixing screws.

[0030] A composite electrolytic grinding method comprises the following steps:

[0031] S1. Fix the workpiece to be processed in the workpiece fixing fixture, and set the workpiece processing trajectory, laser generator tool setting trajectory and grinding wheel dresser tool setting trajectory through the controller;

[0032] S2, connecting the negative electrode of the DC power supply to the conductive component through the negative electrode wire, and connecting the positive electrode of the DC power supply to the grinding wheel dresser and the workpiece fixing fixture through the positive electrode wire;

[0033] S3, the controller controls the XYZ three-axis linear worktable to perform corresponding actions according to the tool setting trajectory of the laser generator and completes the tool setting of the laser generator;

[0034] The laser generator is started through the controller, and the XYZ three-axis linear worktable is controlled to perform corresponding actions according to the workpiece processing trajectory, and the grinding wheel is roughly dressed through the laser generator;

[0035] S4, adjust the universal spray pipe so that the liquid outlet of the universal spray pipe faces the grinding wheel; start the coolant pump through the controller to spray the electrolytic grinding fluid in the coolant tank;

[0036] S5, the controller controls the XYZ three-axis linear worktable to perform corresponding actions according to the tool setting trajectory of the grinding wheel dresser and completes the tool setting of the grinding wheel dresser;

[0037] The grinding wheel dresser is started through the controller, and the XYZ three-axis linear worktable is controlled to perform corresponding actions according to the workpiece processing trajectory; the grinding wheel dresser performs physical grinding and electrolytic grinding on the grinding wheel to complete the fine dressing of the grinding wheel;

[0038] S6. The controller controls the XYZ three-axis linear table to perform corresponding actions according to the workpiece processing trajectory, and the grinding wheel performs physical grinding and electrolytic grinding on the workpiece to complete the grinding of the workpiece.

[0039] Furthermore, in step S3, the laser generator performs laser processing on the grinding wheel with an output power of not less than 50 W, so that the binder of 10 to 50 um on the surface of the grinding wheel is melted, and the abrasive particles in the binder are partially fallen off, thereby completing the rough dressing of the grinding wheel.

[0040] Further, in step S5, the controller controls the XYZ three-axis linear table to move at a speed of 0.0001 to 1000 mm / min along the X direction and at a speed of 0.0001 to 1000 mm / min along the Z direction according to the workpiece processing trajectory;

[0041] At the same time, the XYZ three-axis linear worktable is controlled to dress the grinding wheel with a feed rate of 0.0001 to 0.1 mm along the Y direction;

[0042] After the surface of the grinding wheel contacts the surface of the dresser, electrolysis occurs under the action of the electrolytic grinding fluid and the DC power supply, causing the grinding layer on the surface of the grinding wheel to produce an electrochemical reaction, causing the binder and abrasive grains on the surface of the grinding wheel to fall off, thereby achieving fine dressing of the grinding wheel.

[0043] Further, in step S6, the controller controls the XYZ three-axis linear table to move at a speed of 0.1 to 1000 mm / min along the X direction and at a speed of 0.0001 to 1000 mm / min along the Z direction according to the workpiece processing trajectory;

[0044] At the same time, the XYZ three-axis linear worktable is controlled to grind the workpiece along the Y direction with a feed rate of 0.0001 to 10 mm;

[0045] After the surface of the grinding wheel contacts the surface of the workpiece, the surface of the workpiece is electrolyzed under the action of the electrolytic grinding fluid and the DC power supply, causing an electrochemical reaction on the surface of the workpiece. The workpiece is physically ground and electrolytically ground by the grinding wheel to complete the electrolytic grinding of the workpiece.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] 1. The composite electrolytic grinding machine tool and composite electrolytic grinding processing method provided by the present invention integrate a laser generator, a grinding wheel dresser and an electrolytic grinding head into one. At the same time, the laser generator and the grinding wheel dresser are installed on an XYZ three-axis workbench, so that the controller can move the grinding wheel of the electrolytic grinding head to the position where the laser generator and the grinding wheel dresser dress the grinding wheel according to the tool setting trajectory of the laser generator and the tool setting trajectory of the grinding wheel dresser. At the same time, the controller can control the laser generator to perform rough dressing on the grinding wheel of the electrolytic grinding head according to the workpiece processing trajectory, and control the grinding wheel dresser to perform physical grinding and electrolytic grinding on the grinding wheel to achieve fine dressing of the grinding wheel, thereby achieving online dressing of the grinding wheel. After the online dressing is completed, the controller controls the XYZ three-axis workbench to perform corresponding actions according to the workpiece processing trajectory, and performs physical grinding and electrolytic grinding on the workpiece by the grinding wheel, thereby achieving efficient and high-precision processing of parts.

[0048] 2. The composite electrolytic grinding machine provided by the present invention is provided with an electrolytic grinding head and a conductive component. The electrode in the conductive component is abutted against the electrolytic grinding head through an elastic member and is connected to the wire through a wire fixing member, so that the power supply is convenient for the electrolytic grinding head to be powered by the wire and the electrode to realize electrolytic grinding processing. Compared with the existing electrolytic grinding device, there is no need to use a spindle core to power the grinding wheel, thereby avoiding the problem of unstable electrolytic grinding effect caused by leakage of the grinding wheel due to the conductive medium during high-speed rotation.

[0049] 3. The composite electrolytic grinding machine provided by the present invention connects the positive electrode of the power supply to the workpiece to be ground, and connects the negative electrode of the power supply to the electrode on the conductive seat during electrolytic grinding, so as to realize electrolytic grinding; combined with the provided insulating components, the grinding wheel, the grinding wheel fixing fixture, the conductive seat and the flange are insulated, which helps to avoid the problem of unstable electrolytic grinding effect caused by leakage of the conductive medium during high-speed rotation of the grinding wheel; there is no need to increase the size of the electrolytic voltage and the electrolytic current to ensure the electrolytic grinding effect, which effectively protects the service life of the machine tool spindle. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0051] Figure 2 for Figure 1 Schematic diagram of the internal structure;

[0052] Figure 3 It is a schematic diagram of the structure of the electrolytic grinding head and the conductive component in an embodiment of the present invention;

[0053] Figure 4 for Figure 3 Schematic diagram of the internal structure;

[0054] Figure 5 This is a schematic diagram of an embodiment of the present invention for processing a V-shaped groove of a medical stainless steel indwelling needle;

[0055] Figure 6 This is a schematic diagram of processing a V-shaped groove of a medical stainless steel indwelling needle using an existing grinding method.

[0056] Description of the accompanying drawings: 1-machine body, 2-protective cover, 3-machine spindle, 4-electrolytic grinding head, 41-flange, 42-nut, 43-grinding wheel fixing fixture, 431-first fixing plate, 432-second fixing plate, 433-screw, 44-conductive seat, 45-insulating assembly, 451-first insulating ring, 452-second insulating ring, 453-third insulating ring, 454-insulating cover, 46-machine spindle installation Hole, 47-connecting threaded rod, 5-grinding wheel, 6-conductive component, 61-fixed seat, 62-insulating sleeve, 63-electrode, 64-spring, 65-pressing screw, 66-gasket, 7-XYZ three-axis worktable, 8-workpiece fixing fixture, 9-laser generator, 10-grinding wheel dresser, 11-DC power supply, 12-controller, 13-coolant tank, 14-coolant pump, 15-universal spray pipe, 16-balance block. DETAILED DESCRIPTION

[0057] The technical solutions in the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] like Figure 1 and Figure 2 As shown, a composite electrolytic grinding machine tool comprises a machine tool body 1 having a controller 12, a protective cover 2 is provided on one side of the machine tool body 1 close to the end of the machine tool spindle 3, an electrolytic grinding head 4 installed on the machine tool spindle 3 and having a grinding wheel 5 is provided in the protective cover 2; a conductive component 6 is provided on the outer side of the protective cover 2 and is located on the extension line of the central axis of the machine tool spindle 3, one end of the conductive component 6 penetrates the protective cover 2 and abuts against the electrolytic grinding head 4;

[0059] The machine tool body 1 is provided with an XYZ three-axis worktable 7 located below the electrolytic grinding head 4, and a workpiece fixing fixture 8 for fixing the workpiece and capable of conducting electricity is provided in the middle of the XYZ three-axis worktable 7, as well as a laser generator 9 and a grinding wheel dresser 10 located on the same side of the workpiece fixing fixture 8 or on both sides of the workpiece fixing fixture 8; the grinding wheel dresser 10 and the workpiece fixing fixture 8 are connected to the positive electrode of the DC power supply 11 through a positive wire, and the conductive component 6 is connected to the negative electrode of the DC power supply 11 through a negative wire;

[0060] The machine tool body 1 is provided with a coolant tank 13 and a coolant pump 14. The inlet of the coolant pump 14 is communicated with the interior of the coolant tank 13. The outlet of the coolant pump 14 is provided with a universal spray pipe 15.

[0061] The grinding wheel dresser 10 , the laser generator 9 , the XYZ three-axis worktable 7 , the machine tool body 1 , the coolant pump 14 , and the DC power supply 11 are all connected to the controller 12 .

[0062] like Figure 3 and Figure 4 As shown, the electrolytic grinding head 4 includes a stepped flange 41, the small end of the flange 41 is provided with a connecting portion, and a nut 42 is sleeved on the connecting portion; a grinding wheel fixing fixture 43 is sleeved on the small end of the flange 41, and the grinding wheel 5 is fixed in the grinding wheel fixing fixture 43; a conductive seat 44 is provided on the side of the grinding wheel fixing fixture 43 close to the nut 42, and an insulating component 45 is provided between the conductive seat 44, the grinding wheel fixing fixture 43 and the flange 41; the middle part of the conductive seat 44 away from the grinding wheel fixing fixture 43 is in contact with the conductive component 6; in order to connect the electrolytic grinding device with the machine tool spindle 3 of the electrolytic grinding machine, a machine tool spindle 3 mounting hole is opened at the large end of the flange 41, and a connecting threaded rod 47 is provided in the mounting hole of the machine tool spindle 3, and the connecting threaded rod 47 is connected to the machine tool spindle 3.

[0063] like Figure 3 and Figure 4 As shown, the conductive component 6 includes a fixing seat 61 installed on the protective cover 2, and one end of the fixing seat 61 close to the electrolytic grinding head 4 penetrates the protective cover 2; an insulating sleeve 62 is installed in the middle of the fixing seat 61; a stepped hole is opened in the middle of the insulating sleeve 62, and an electrode 63 adapted to the stepped hole is slidably installed in the stepped hole. In order to enable the electrode 63 to slide in the insulating sleeve 62 without rotating, a guide plane is opened on the side of the small end of the electrode 63; a guide bolt is inserted into the side of the insulating sleeve 62, and the stud end face of the guide bolt is in contact with the guide plane;

[0064] like Figure 4 As shown, in order to make one end of the electrode 63 abut against the conductive seat 44, the large end of the electrode 63 abuts against the electrolytic grinding head 4, and a spring 64 is sleeved on the small end of the electrode 63, and the two ends of the spring 64 abut against the large end surface of the stepped hole and the large end surface of the electrode 63 respectively;

[0065] like Figure 3 and Figure 4 As shown, in order to connect the wire to the electrode 63, a clamping screw 65 is threadedly installed on the small end face of the electrode 63, and a gasket 66 is sleeved on the stud of the clamping screw 65. The negative wire is fixed between the gasket 66 and the nut of the clamping screw 65.

[0066] like Figure 3 and Figure 4As shown, in order to avoid the problem of unstable electrolytic grinding effect caused by leakage during the electrolytic grinding process, the insulating component 45 includes a first insulating ring 451 sleeved on the small end of the flange 41; the outer side of the first insulating ring 451 is sleeved with a second insulating ring 452 and a third insulating ring 453 distributed on both sides of the grinding wheel fixing fixture 43, and the side of the second insulating ring 452 away from the third insulating ring 453 is provided with an insulating cover 454; the cross-section of the second insulating ring 452 and the third insulating ring 453 is L-shaped; the first insulating ring 451, the second insulating ring 452, the third insulating ring 453 and the insulating cover 454 are used to achieve isolation between the flange 41, the nut 42 and the conductive seat 44, and the grinding wheel fixing fixture 43.

[0067] like Figure 3 and Figure 4 As shown, the grinding wheel fixing fixture 43 includes a first fixing plate 431 and a second fixing plate 432 which are sleeved on the outside of the first insulating ring 451; the first fixing plate 431 is provided with an annular placement groove, and the grinding wheel 5 is placed in the placement groove, and the first fixing plate 431, the grinding wheel 5 and the second fixing plate 432 are connected by multiple screws 433 evenly distributed around the circumference.

[0068] like Figure 3 and Figure 4 As shown, in order to ensure that the electrolytic grinding device rotates more stably when the machine tool spindle 3 rotates, an annular groove is provided on the end surface of the nut 42 away from the first insulating ring 451, and multiple balancing blocks 16 are installed in the annular groove through fixing screws 433.

[0069] like Figure 3 and Figure 4 As shown, in order to enable the electrolytic grinding device to be installed on different electrolytic grinding machine tools, the small end of the flange 41 is provided with a stepped mounting hole connected to the mounting hole of the machine tool spindle 3; the connecting threaded rod 47 is provided with a boss that can be adapted to the large section of the stepped mounting hole; the connecting threaded rod 47 is clamped in the stepped mounting hole through the boss on the connecting threaded rod 47.

[0070] The composite electrolytic grinding method based on the composite electrolytic grinding machine provided by the present invention is specifically as follows:

[0071] 1) Fix the workpiece to be processed in the workpiece fixing fixture 8, and set the workpiece processing trajectory, the laser generator 9 tool setting trajectory and the grinding wheel dresser 10 tool setting trajectory through the controller 12;

[0072] 2) Connect the negative electrode of the DC power supply 11 to the conductive component 6 through a negative electrode wire, and connect the positive electrode of the DC power supply 11 to the grinding wheel dresser 10 and the workpiece fixing fixture 8 through a positive electrode wire;

[0073] 3) The controller 12 controls the XYZ three-axis linear worktable to perform corresponding actions according to the tool setting trajectory of the laser generator 9 and completes the tool setting of the laser generator 9;

[0074] The laser generator 9 is started by the controller 12, and the XYZ three-axis linear worktable is controlled to perform corresponding actions according to the workpiece processing trajectory. The laser generator 9 performs laser processing on the grinding wheel 5 with an output power of not less than 50W, so that the bonding agent of 10 to 50um on the surface of the grinding wheel 5 is melted, and the abrasive particles in the bonding agent are partially fallen off, and the rough dressing of the grinding wheel 5 is completed;

[0075] 4) adjusting the universal spray pipe 15 so that the liquid outlet of the universal spray pipe 15 faces the grinding wheel 5; starting the coolant pump 14 through the controller 12 to spray the electrolytic grinding fluid in the coolant tank 13;

[0076] 5) The controller 12 controls the XYZ three-axis linear worktable to perform corresponding actions according to the tool setting trajectory of the grinding wheel dresser 10 and completes the tool setting of the grinding wheel dresser 10;

[0077] The grinding wheel dresser 10 is started by the controller 12, and the controller 12 controls the XYZ three-axis linear table to move at a speed of 0.0001 to 1000 mm / min along the X direction and at a speed of 0.0001 to 1000 mm / min along the Z direction according to the workpiece processing trajectory;

[0078] At the same time, the XYZ three-axis linear worktable is controlled to dress the grinding wheel 5 along the Y direction with a feed amount of 0.0001 to 0.1 mm;

[0079] After the surface of the grinding wheel 5 contacts the surface of the dresser, electrolysis occurs under the action of the electrolytic grinding fluid and the DC power supply 11, causing the grinding layer on the surface of the grinding wheel 5 to produce an electrochemical reaction, causing the binder and abrasive grains on the surface of the grinding wheel 5 to fall off, thereby achieving fine dressing of the grinding wheel 5;

[0080] 6) The controller 12 controls the XYZ three-axis linear worktable to move at a speed of 0.1 to 1000 mm / min along the X direction and at a speed of 0.0001 to 1000 mm / min along the Z direction according to the workpiece processing trajectory;

[0081] At the same time, the XYZ three-axis linear worktable is controlled to grind the workpiece along the Y direction with a feed rate of 0.0001 to 10 mm;

[0082] After the surface of the grinding wheel 5 contacts the surface of the workpiece, the surface of the workpiece is electrolyzed under the action of the electrolytic grinding fluid and the DC power supply 11, causing an electrochemical reaction on the surface of the workpiece. The grinding wheel 5 performs physical grinding and electrolytic grinding on the workpiece to complete the electrolytic grinding of the workpiece.

[0083] The present invention can realize the mirror processing of various stainless steel injection needles, stainless steel medical equipment, titanium alloy aircraft engine nozzles, silicon carbide ceramic molds, lithium battery coating die heads, and the efficient and high-precision processing of diamond-type PCD tools and cemented carbide tools;

[0084] Among them, the composite electrolytic grinding method in the embodiment of the present invention is used to process the V-shaped groove of the medical stainless steel indwelling needle. The specific results are as follows: Figure 5 As shown; as a comparison, the V-shaped groove of the medical stainless steel indwelling needle was processed by conventional grinding, and the results are as follows Figure 6 shown; based on Figure 5 and Figure 6 It is not difficult to see that the composite electrolytic grinding process of the present invention has better quality than the conventional grinding process.

[0085] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A composite electrolytic grinding machine tool, characterized in that: The invention comprises a machine tool body (1) having a controller (12), a protective cover (2) being provided on one side of the machine tool body (1) close to the end of a machine tool spindle (3), and an electrolytic grinding head (4) having a grinding wheel (5) and mounted on the machine tool spindle (3) being provided inside the protective cover (2); A conductive component (6) is provided on the outer side of the protective cover (2) and is located on the extension line of the central axis of the machine tool spindle (3); one end of the conductive component (6) penetrates the protective cover (2) and abuts against the electrolytic grinding head (4); The machine tool body (1) is provided with an XYZ three-axis worktable (7) located below the electrolytic grinding head (4); a workpiece fixing fixture (8) capable of conducting electricity and used for fixing the workpiece is provided in the middle of the XYZ three-axis worktable (7); and a laser generator (9) and a grinding wheel dresser (10) are located on the same side of the workpiece fixing fixture (8) or on both sides of the workpiece fixing fixture (8). The grinding wheel dresser (10) and the workpiece fixing fixture (8) are connected to the positive electrode of the DC power supply (11) via a positive electrode wire, and the conductive component (6) is connected to the negative electrode of the DC power supply (11) via a negative electrode wire; The machine tool body (1) is provided with a coolant tank (13) and a coolant pump (14); the liquid inlet of the coolant pump (14) is connected to the inside of the coolant tank (13); and a universal liquid spray pipe (15) is provided at the liquid outlet of the coolant pump (14); The grinding wheel dresser (10), the laser generator (9), the XYZ three-axis workbench (7), the machine tool body (1), the coolant pump (14), and the direct current power supply (11) are all connected to the controller (12).

2. The composite electrolytic grinding machine tool according to claim 1, characterized in that: The electrolytic grinding head (4) comprises a stepped flange (41), the small end of the flange (41) is provided with a connecting portion, and a nut (42) is sleeved on the connecting portion; A grinding wheel fixing fixture (43) is sleeved on the small end of the flange (41), and the grinding wheel (5) is fixed in the grinding wheel fixing fixture (43); A conductive seat (44) is provided on one side of the grinding wheel fixing fixture (43) close to the nut (42), and an insulating component (45) is provided between the conductive seat (44), the grinding wheel fixing fixture (43) and the flange (41); The middle part of the conductive seat (44) away from the grinding wheel fixing fixture (43) abuts against the conductive component (6); The large end of the flange (41) is provided with a machine tool spindle (3) mounting hole, and a connecting threaded rod (47) is arranged in the machine tool spindle (3) mounting hole, and the connecting threaded rod (47) is connected to the machine tool spindle (3).

3. The composite electrolytic grinding machine tool according to claim 1, characterized in that: The conductive component (6) comprises a fixing seat (61) mounted on the protective cover (2), and one end of the fixing seat (61) close to the electrolytic grinding head (4) penetrates the protective cover (2); An insulating sleeve (62) is installed in the middle of the fixing seat (61); A stepped hole is provided in the middle of the insulating sleeve (62), an electrode (63) adapted to the stepped hole is slidably mounted in the stepped hole, the large end of the electrode (63) abuts against the electrolytic grinding head (4), a spring (64) is sleeved on the small end of the electrode (63), and the two ends of the spring (64) abut against the large end surface of the stepped hole and the large end surface of the electrode (63) respectively; A clamping screw (65) is threadedly mounted on the small end surface of the electrode (63), a gasket (66) is sleeved on the stud of the clamping screw (65), and the negative electrode wire is fixed between the gasket (66) and the nut of the clamping screw (65).

4. The composite electrolytic grinding machine tool according to claim 2, characterized in that: The insulating assembly (45) comprises a first insulating ring (451) sleeved on the small end of the flange (41); The outer side of the first insulating ring (451) is sleeved with a second insulating ring (452) and a third insulating ring (453) distributed on both sides of the grinding wheel fixing fixture (43); an insulating cover (454) is provided on the side of the second insulating ring (452) away from the third insulating ring (453).

5. The composite electrolytic grinding machine tool according to claim 4, characterized in that: The grinding wheel fixing fixture (43) comprises a first fixing plate (431) and a second fixing plate (432) which are sleeved on the outside of the first insulating ring (451); The first fixed disk (431) is provided with an annular placement groove, the grinding wheel (5) is placed in the placement groove, and the first fixed disk (431), the grinding wheel (5) and the second fixed disk (432) are connected by a plurality of screws (433) evenly distributed around the circumference.

6. The composite electrolytic grinding machine tool according to claim 2, characterized in that: An annular groove is provided on the end surface of the nut (42) which is away from the first insulating ring (451), and a plurality of balancing blocks (16) are installed in the annular groove via fixing screws (433).

7. A composite electrolytic grinding method, characterized in that: The steps include: S1, fixing a workpiece to be processed in a workpiece fixing fixture (8), and setting a workpiece processing trajectory, a laser generator (9) tool setting trajectory, and a grinding wheel dresser (10) tool setting trajectory through a controller (12); S2, connecting the negative electrode of the DC power supply (11) to the conductive component (6) through a negative electrode wire, and connecting the positive electrode of the DC power supply (11) to the grinding wheel dresser (10) and the workpiece fixing fixture (8) through a positive electrode wire; S3, the controller (12) controls the XYZ three-axis linear worktable to perform corresponding actions according to the tool setting trajectory of the laser generator (9) and completes the tool setting of the laser generator (9); The laser generator (9) is started by a controller (12), and the XYZ three-axis linear worktable is controlled to perform corresponding actions according to the workpiece processing trajectory, and the grinding wheel (5) is roughly trimmed by the laser generator (9); S4, adjusting the universal spray pipe (15) so that the liquid outlet of the universal spray pipe (15) faces the grinding wheel (5); starting the coolant pump (14) through the controller (12) to spray the electrolytic grinding fluid in the coolant tank (13); S5, the controller (12) controls the XYZ three-axis linear worktable to perform corresponding actions according to the tool setting trajectory of the grinding wheel dresser (10) and completes the tool setting of the grinding wheel dresser (10); The grinding wheel dresser (10) is started by a controller (12), and the XYZ three-axis linear worktable is controlled to perform corresponding actions according to the workpiece processing trajectory; the grinding wheel dresser (10) performs physical grinding and electrolytic grinding on the grinding wheel (5) to complete the fine dressing of the grinding wheel (5); S6, the controller (12) controls the XYZ three-axis linear worktable to perform corresponding actions according to the workpiece processing trajectory, and the grinding wheel (5) performs physical grinding and electrolytic grinding on the workpiece to complete the grinding process of the workpiece.

8. The composite electrolytic grinding method according to claim 7, characterized in that: In step S3, the laser generator (9) performs laser processing on the grinding wheel (5) with an output power of not less than 50 W, so that the bonding agent of 10 to 50 μm on the surface of the grinding wheel (5) is melted, and the abrasive particles in the bonding agent are partially removed, thereby completing the rough dressing of the grinding wheel (5).

9. The composite electrolytic grinding method according to claim 7, characterized in that: In step S5, the controller (12) controls the XYZ three-axis linear worktable to move at a speed of 0.0001 to 1000 mm / min along the X direction and at a speed of 0.0001 to 1000 mm / min along the Z direction according to the workpiece processing trajectory; At the same time, the XYZ three-axis linear worktable is controlled to dress the grinding wheel (5) along the Y direction with a feed amount of 0.0001 to 0.1 mm; After the surface of the grinding wheel (5) contacts the surface of the dresser, electrolysis occurs under the action of the electrolytic grinding fluid and the direct current power supply (11), causing the grinding layer on the surface of the grinding wheel (5) to produce an electrochemical reaction, causing the binder and abrasive grains on the surface of the grinding wheel (5) to fall off, thereby achieving fine dressing of the grinding wheel (5).

10. The composite electrolytic grinding method according to claim 7, characterized in that: In step S6, the controller (12) controls the XYZ three-axis linear worktable to move at a speed of 0.1 to 1000 mm / min along the X direction and at a speed of 0.0001 to 1000 mm / min along the Z direction according to the workpiece processing trajectory; At the same time, the XYZ three-axis linear worktable is controlled to grind the workpiece along the Y direction with a feed rate of 0.0001 to 10 mm; After the surface of the grinding wheel (5) contacts the surface of the workpiece, the surface of the workpiece is electrolyzed under the action of the electrolytic grinding fluid and the direct current power supply (11), causing an electrochemical reaction to occur on the surface of the workpiece. The grinding wheel (5) performs physical grinding and electrolytic grinding on the workpiece, thereby completing the electrolytic grinding process on the workpiece.

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