Polishing method and equipment for aluminum alloy die casting

Abstract

The invention relates to the field of grinding, and provides an aluminum alloy die casting grinding method and equipment which comprises a base, two first mounting frames are fixedly connected to the top wall of the base, a second mounting frame is fixedly connected to the two first mounting frames, and a first electric push rod is fixedly connected to the second mounting frame; an electromagnet and two transmission pieces are fixedly connected to a movable part of the first electric push rod, a driving roller set is connected to the first electric push rod, two tooth grooves are formed in the inner wall of the first electric push rod, limiting tooth sets are fixedly connected to the inner walls of the tooth grooves, two supporting assemblies are connected to the base, and each supporting assembly comprises a supporting roller set, a linkage rod and an L-shaped plate; one end of the linkage rod is rotationally connected with the supporting roller set, the other end of the linkage rod is rotationally connected with the L-shaped plate, an internal grinding roller assembly is connected to the base, and an external grinding assembly is connected to one of the first mounting frames. According to the embodiment, only one first electric push rod is arranged for driving, and the effects of adjusting the distance between the two supporting roller sets and pressing a workpiece through the driving roller set can be achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of grinding, and particularly relates to a grinding method and device for aluminum alloy die-castings. Background Art

[0002] The Chinese authorized utility model patent with the publication number CN222570119U discloses a grinding device for aviation aluminum alloy tubular castings, which includes a base. Two support seats are arranged on the base. Two groups of first electric push rods are symmetrically arranged on both support seats through support grooves. The output end of the first electric push rod is provided with a support roller group. A second electric push rod is arranged above the base through a mounting frame. The bottom end of the second electric push rod is provided with a driving roller group. An external grinding block is arranged on one side between the support seat and the driving roller group, and a moving driving structure is arranged in cooperation with the external grinding block. A mounting seat is arranged on one side of the base through a third electric push rod. A first motor, a fourth electric push rod and an internal grinding roller are sequentially connected on the mounting seat. The present invention can realize the flexible support and rotational drive of aviation aluminum alloy tubular castings during grinding, and at the same time can synchronously realize the synchronous grinding of the interior and outer walls of aviation aluminum alloy tubular castings, improving the processing efficiency.

[0003] However, the above patent is provided with multiple electric components such as electric push rods and motors, making its maintenance difficult, and more electric components are also more prone to failure. Summary of the Invention

[0004] Aiming at the above technical problems, the present invention aims to provide a grinding method and device for aluminum alloy die-castings. To solve the above technical problems, the present invention adopts the following technical solutions to achieve:

[0005] A grinding device for aluminum alloy die-castings includes a base. Two first mounting frames are fixedly connected to the top wall of the base. A second mounting frame is fixedly connected to the two first mounting frames. A first electric push rod is fixedly connected to the second mounting frame. An electromagnet and two transmission pieces are fixedly connected to the movable part of the first electric push rod. A driving roller group is connected to the first electric push rod. Two tooth grooves are formed in the inner wall of the first electric push rod, and a limiting tooth group is fixedly connected to the inner wall of the tooth groove;

[0006] Two support components are connected to the base. The support components include a support roller group, a linkage rod and an L-shaped plate. One end of the linkage rod is rotatably connected to the support roller group, and the other end of the linkage rod is rotatably connected to the L-shaped plate. The L-shaped plate is slidably connected to the inner wall of the second mounting frame. An iron sliding rod is slidably connected to the L-shaped plate. A clamping tooth is fixedly connected to one end of the iron sliding rod. A connecting piece is fixedly connected to the iron sliding rod. The connecting piece is connected to the L-shaped plate through an elastic member. An internal grinding roller assembly is connected to the base, and an external grinding assembly is connected to one of the first mounting frames.

[0007] Preferably, the external grinding roller assembly includes a second electric push rod and a lifting plate. The second electric push rod is fixedly connected to the top wall of the base, the lifting plate is fixedly connected to the movable part of the second electric push rod, a first C-shaped bracket is fixedly connected to the lifting plate, a threaded hole is formed in the first C-shaped bracket, an extension plate is slidably connected to the lifting plate, and a double-shaft motor and a speed reducer are fixedly connected to the extension plate.

[0008] A grinding head is fixedly connected to the output shaft on one side of the double-shaft motor, the output shaft on the other side of the double-shaft motor is fixedly connected to the input shaft of the speed reducer, a threaded rod is fixedly connected to the output shaft of the speed reducer, and the threaded rod is threadedly connected to the inner wall of the threaded hole.

[0009] Preferably, a first permanent magnet is fixedly connected to the grinding head, an automatic water collecting pipe is fixedly connected to the top wall of the base, a water pipe body is movably connected to the automatic water collecting pipe, a spray head assembly is fixedly connected to one end of the water pipe body, a second permanent magnet is connected to the spray head assembly, a spray head support frame is fixedly connected to the top wall of the base, the spray head support frame supports the water pipe body, and the water pipe body is connected to an external water supply system.

[0010] Preferably, the spray head assembly includes a spray head fixing part and a spray head rotating part. The spray head fixing part is fixedly connected to one end of the water pipe body, the spray head rotating part is rotatably connected to the spray head fixing part, the second permanent magnet is fixedly connected to the spray head rotating part, a water passing channel is formed in the spray head fixing part, a water cavity is formed in the spray head rotating part, the water cavity is communicated with the outer wall of the spray head rotating part through two or more water outlet channels, and the water cavity is communicated with the water passing channel.

[0011] Preferably, an extension part is provided on the first permanent magnet, and a groove is formed in the second permanent magnet.

[0012] Preferably, an electric valve is connected to the inner wall of the water passing channel, and a ranging sensor is connected to the spray head fixing part.

[0013] Preferably, a controller is provided on the base.

[0014] Preferably, the movable part of the second electric push rod is fixedly connected to the lifting plate through a second C-shaped bracket.

[0015] Preferably, two or more balls are rotatably connected to the transmission piece.

[0016] A grinding method for aluminum alloy die-castings includes grinding a workpiece by using the grinding equipment for aluminum alloy die-castings, placing the workpiece on two support roller groups, pressing the workpiece by using a driving roller group, grinding the inner wall of the workpiece by using an internal grinding roller assembly, and grinding the outer wall of the workpiece by using an external grinding assembly.

[0017] The present invention has the following beneficial effects:

[0018] This embodiment can achieve the effects of adjusting the distance between two support roller groups and driving the roller group to press the workpiece by only setting one first electric push rod, so as to adapt to workpieces of different sizes, and can automatically limit and release the limit of the two support roller groups, achieving the effects of linkage and disconnection of the first electric push rod and the support roller group. There is no need to set multiple electric push rods as in the prior art, reducing the setting of electrical components, reducing the device maintenance cost, reducing the maintenance difficulty and reducing the component failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described with reference to the accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the following drawings without creative efforts.

[0020] Figure 1 is a schematic structural diagram of a grinding device for aluminum alloy die-castings of the present invention;

[0021] Figure 2 is the present invention Figure 1 an enlarged view of part A in;

[0022] Figure 3 is the present invention Figure 1 an enlarged view of part B in;

[0023] Figure 4 is the present invention Figure 1 a right view of the support roller group, the internal grinding roller assembly, and the automatic water collecting pipe in;

[0024] Figure 5 is the present invention Figure 4 an enlarged view of the spray head assembly in;

[0025] Figure 6 is the present invention Figure 1 a right view of the first mounting bracket and the second mounting bracket in.

[0026] Reference numerals: 1, base; 2, first mounting bracket; 3, second mounting bracket; 4, first electric push rod; 5, drive roller set; 6, support roller set; 7, linkage rod; 8, L-shaped plate; 9, iron sliding rod; 10, engaging teeth; 11, tooth groove; 12, limit tooth set; 13, elastic member; 14, connecting piece; 15, ball; 16, electromagnet; 17, transmission piece; 18, second electric push rod; 19, lifting plate; 20, first C-shaped bracket; 21, threaded hole; 22, second C-shaped bracket; 23, double-shaft motor; 24, grinding head; 25, first permanent magnet; 26, reducer; 27, threaded rod; 28, extension plate; 29, automatic water reel; 30, water pipe body; 31, nozzle fixing part; 32, nozzle rotating part; 33, second permanent magnet; 34, nozzle support frame; 35, water passing channel; 36, water outlet channel; 37, water cavity; 38, external grinding assembly; 39, workpiece. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, "first", "second", "third", and "fourth" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or a connection through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] As Figures 1-3 、 Figure 6As shown in the figure, a grinding device for aluminum alloy die-castings includes a base 1. Two first mounting brackets 2 are fixedly connected to the top wall of the base 1. A second mounting bracket 3 is fixedly connected to the two first mounting brackets 2. A first electric push rod 4 is fixedly connected to the second mounting bracket 3. An electromagnet 16 and two transmission pieces 17 are fixedly connected to the movable part of the first electric push rod 4. A driving roller set 5 is connected to the first electric push rod 4. Two tooth grooves 11 are formed in the inner wall of the first electric push rod 4. A limiting tooth group 12 is fixedly connected to the inner wall of the tooth groove 11.

[0031] Two support components are connected to the base 1. The support components include a support roller set 6, a linkage rod 7, and an L-shaped plate 8. One end of the linkage rod 7 is rotatably connected to the support roller set 6, and the other end of the linkage rod 7 is rotatably connected to the L-shaped plate 8. The L-shaped plate 8 is slidably connected to the inner wall of the second mounting bracket 3. An iron sliding rod 9 is slidably connected to the L-shaped plate 8. A clamping tooth 10 is fixedly connected to one end of the iron sliding rod 9. A connecting piece 14 is fixedly connected to the iron sliding rod 9. The connecting piece 14 is connected to the L-shaped plate 8 through an elastic member 13. An internal grinding roller assembly is connected to the base 1. An external grinding assembly 38 is connected to one of the first mounting brackets 2.

[0032] Embodiment 1:

[0033] Reference Figures 1-3 、 Figure 6 In the initial state, the clamping tooth 10 is inserted into the limiting tooth group 12 for limiting, and the electromagnet 16 is located above the iron sliding rod 9. The workpiece 39 can be a tubular aluminum alloy die-cast. Of course, the workpiece 39 can also be other metal pipe fittings.

[0034] First, adjust the distance between the two support roller sets 6 to adapt to workpieces 39 of different sizes. Control the movable part of the first electric push rod 4 to extend, thereby driving the driving roller set 5, the electromagnet 16, and the transmission pieces 17 to move downward. When the electromagnet 16 moves to the same height as the iron sliding rod 9, control the electromagnet 16 to energize to generate a magnetic force. The electromagnet 16 attracts the two iron sliding rods 9. The iron sliding rods 9 overcome the elastic force of the elastic member 13 and move between the two transmission pieces 17. The clamping tooth 10 disengages from the limiting tooth group 12, thus releasing the limit on the L-shaped plate 8 and the support roller set 6. The first electric push rod 4 continues to extend. The upper transmission piece 17 pushes the two iron sliding rods 9 downward, thereby causing the two L-shaped plates 8 to move downward. The two L-shaped plates 8 drive the two support roller sets 6 to gradually approach through the two linkage rods 7. When the two support roller sets 6 approach to an appropriate distance, the electromagnet 16 is de-energized. The two iron sliding rods 9 move away from each other under the restoring force of the elastic member 13, and the clamping tooth 10 is inserted into the limiting tooth group 12 to limit the L-shaped plate 8, thereby limiting the support roller set 6.

[0035] Place the workpiece 39 on the two support roller sets 6. The movable part of the first electric push rod 4 continues to extend until the driving roller set 5 presses the workpiece 39 tightly.

[0036] The driving roller set 5 is used to press the workpiece 39, and the driving roller set 5 drives the workpiece 39 to rotate. The external grinding assembly 38 is adjusted to an appropriate length to grind the outer wall of the workpiece 39. The external grinding assembly 38 can also move back and forth to grind all positions on the outer wall of the workpiece 39. The inner wall of the workpiece 39 is ground by the inner grinding roller assembly.

[0037] The working principle of the two support roller sets 6 moving away from each other can be easily known from the above working principle, that is, the iron sliding rod 9 is moved between the two transmission pieces 17 by using the electromagnet 16, and the movable part of the electric push rod 4 is shortened.

[0038] The structures of the external grinding assembly 38 and the driving roller set 5 can be set with reference to the prior art CN222570119U.

[0039] In this embodiment, by only setting one first electric push rod 4 for driving, the effects of adjusting the distance between the two support roller sets 6 and driving the driving roller set 5 to press the workpiece 39 can be achieved to adapt to workpieces 39 of different sizes, and the two support roller sets 6 can be automatically limited and released from the limit, achieving the effects of linkage and disconnection of the first electric push rod 4 and the support roller set 6. There is no need to set multiple electric push rods as in the prior art, reducing the setting of electrical components, reducing the device maintenance cost, reducing the maintenance difficulty and reducing the component failure rate.

[0040] As Figure 4 shown, in an optional embodiment according to the present invention, the external grinding roller assembly includes a second electric push rod 18 and a lifting plate 19. The second electric push rod 18 is fixedly connected to the top wall of the base 1, the lifting plate 19 is fixedly connected to the movable part of the second electric push rod 18, a first C-shaped frame 20 is fixedly connected to the lifting plate 19, a threaded hole 21 is formed in the first C-shaped frame 20, an extension plate 28 is slidably connected to the lifting plate 19, a double-shaft motor 23 and a speed reducer 26 are fixedly connected to the extension plate 28, a grinding head 24 is fixedly connected to the output shaft on one side of the double-shaft motor 23, the output shaft on the other side of the double-shaft motor 23 is fixedly connected to the input shaft of the speed reducer 26, and a threaded rod 27 is fixedly connected to the output shaft of the speed reducer 26. The threaded rod 27 is threadedly connected to the inner wall of the threaded hole 21.

[0041] As Figures 4-5 shown, in an optional embodiment according to the present invention, a first permanent magnet 25 is fixedly connected to the grinding head 24, an automatic water collecting pipe device 29 is fixedly connected to the top wall of the base 1, a water pipe body 30 is movably connected to the automatic water collecting pipe device 29, a spray head assembly is fixedly connected to one end of the water pipe body 30, a second permanent magnet 33 is connected to the spray head assembly, a spray head support frame 34 is fixedly connected to the top wall of the base 1, the spray head support frame 34 supports the water pipe body 30, and the water pipe body 30 is connected to an external water supply system.

[0042] As Figures 4-5As shown, in an alternative embodiment of the present invention, the nozzle assembly includes a nozzle fixing part 31 and a nozzle rotating part 32. The nozzle fixing part 31 is fixedly connected to one end of the water pipe body 30, and the nozzle rotating part 32 is rotatably connected to the nozzle fixing part 31. The second permanent magnet 33 is fixedly connected to the nozzle rotating part 32. A water passage 35 is provided on the nozzle fixing part 31, and a water cavity 37 is provided on the nozzle rotating part 32. The water cavity 37 communicates with the outer wall of the nozzle rotating part 32 through two or more water outlet channels 36, and the water cavity 37 communicates with the water passage 35.

[0043] In an alternative embodiment of the present invention, the first permanent magnet 25 is provided with an extension part, and the second permanent magnet 33 is provided with a groove. The extension part can be inserted into the groove to prevent the second permanent magnet 33 from separating from the first permanent magnet 25 when it rotates.

[0044] In an alternative embodiment of the present invention, an electric valve is connected to the inner wall of the water passage 35, and a distance measuring sensor is connected to the nozzle fixing part 31. The distance measuring sensor can detect the distance of the grinding head 24, and the processing module in the distance measuring sensor can control the opening and closing of the electric valve.

[0045] In an alternative embodiment of the present invention, a controller is provided on the base 1. The controller is used to control the operation of each electrical component.

[0046] In an alternative embodiment of the present invention, the movable part of the second electric push rod 18 is fixedly connected to the lifting plate 19 through a second C-shaped frame 22.

[0047] In an alternative embodiment of the present invention, two or more balls 15 are rollingly connected to the transmission piece 17. The balls 15 can reduce the friction between the iron sliding rod 9 and the transmission piece 17, making it easier for the iron sliding rod 9 to disengage from the transmission piece 17.

[0048] Embodiment Two:

[0049] Referring to Figure 4 the direction, on the basis of Embodiment One, the operating principle of the internal grinding roller assembly is described.

[0050] The dual-axis motor 23 starts, and the output shaft on the right wall of the dual-axis motor 23 drives the grinding head 24 to rotate rapidly. The output shaft on the left wall of the dual-axis motor 23 drives the threaded rod 27 to rotate slowly after being decelerated by the reducer 26. Since the threaded rod 27 is threadedly connected to the threaded hole 21, and the first C-shaped bracket 20 is fixedly connected to the lifting plate 19, the dual-axis motor 23 will drive the grinding head 24 and the extension plate 28 to move to the right. The grinding head 24 enters the external grinding assembly 38. The movable part of the second electric push rod 18 can adjust the height of the lifting plate 19, thereby adjusting the height of the grinding head 24, so that the grinding head 24 grinds the inner wall of the external grinding assembly 38. The grinding head 24 gradually moves to the right to grind all positions on the inner wall of the external grinding assembly 38. After the grinding is completed, when the first permanent magnet 25 and the second permanent magnet 33 approach, they will be magnetically connected. The extension part on the first permanent magnet 25 will be inserted into the groove of the second permanent magnet 33 to prevent the second permanent magnet 33 from detaching from the first permanent magnet 25 when the second permanent magnet 33 rotates subsequently. After the distance measuring sensor on the nozzle fixing part 31 detects the approach of the grinding head 24, it will open the electric valve in the water passing channel 35. The water from the external water supply system enters the water passing channel 35 and the water cavity 37 and then sprays out from all the water outlet channels 36. When the dual-axis motor 23 rotates in reverse, the grinding head 24 will drive the second permanent magnet 33 and the nozzle rotating part 32 to move leftward while rotating. The water pipe body 30 will gradually be released from the automatic water retractor 29. The rotation of the nozzle rotating part 32 will make the water sprayed out from the water outlet channels 36 more comprehensively wash and clean the inner wall of the external grinding assembly 38, removing the debris and grease on the inner wall of the external grinding assembly 38, without the need for subsequent personnel to insert other tools into the external grinding assembly 38 to clean the inner wall of the external grinding assembly 38, improving the processing efficiency. When the water pipe body 30 extends to the limit state, the grinding head 24 continues to move leftward. The second permanent magnet 33 cannot continue to move leftward, and the second permanent magnet 33 will detach from the grinding head 24. Under the self-recovery force of the automatic water retractor 29, the water pipe body 30 is recovered until the nozzle fixing part 31 abuts against the nozzle support frame 34 and then stops recovering, and the nozzle assembly is reset.

[0051] This embodiment can utilize a single electrical component, the dual-axis motor 23, to achieve the rotation of the grinding head 24 while enabling the grinding head 24 to move within the external grinding assembly 38, without the need to set multiple electric push rods as in the prior art, further reducing the setting of electrical components, further reducing the device maintenance cost, reducing the maintenance difficulty, and reducing the component failure rate. Moreover, through the distance measuring sensor, after the grinding head 24 finishes grinding the inner wall of the external grinding assembly 38, the water outlet channels 36 automatically spray water, and the magnetic force of the first permanent magnet 25 drives the nozzle assembly to spray water while translating and rotating, realizing the automatic flushing of the inner wall of the external grinding assembly 38, solving the technical problem in the prior art that it is difficult to clean the inner wall of the external grinding assembly 38 and improving the production efficiency.

[0052] A grinding method for an aluminum alloy die-casting includes grinding a workpiece 39 by using the grinding equipment for the aluminum alloy die-casting, placing the workpiece 39 on two support roller sets 6, pressing the workpiece 39 by using a driving roller set 5, grinding the inner wall of the workpiece 39 by using an internal grinding roller assembly, and grinding the outer wall of the workpiece 39 by using an external grinding assembly 38.

[0053] Components, modules, mechanisms, and devices whose structures are not described in detail in the present invention are all common standard parts or parts known to those skilled in the art. Their structures and principles can all be known by those skilled in the art through technical manuals or through conventional experimental methods.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A grinding device for aluminum alloy die-castings, characterized in that, It includes a base (1). Two first mounting brackets (2) are fixedly connected to the top wall of the base (1). A second mounting bracket (3) is fixedly connected to the two first mounting brackets (2). A first electric push rod (4) is fixedly connected to the second mounting bracket (3). An electromagnet (16) and two transmission pieces (17) are fixedly connected to the movable part of the first electric push rod (4). A driving roller set (5) is connected to the first electric push rod (4). Two tooth grooves (11) are formed in the inner wall of the first electric push rod (4). A limiting tooth group (12) is fixedly connected to the inner wall of the tooth groove (11). Two support components are connected to the base (1). The support components include a support roller set (6), a linkage rod (7), and an L-shaped plate (8). One end of the linkage rod (7) is rotatably connected to the support roller set (6), and the other end of the linkage rod (7) is rotatably connected to the L-shaped plate (8). The L-shaped plate (8) is slidably connected to the inner wall of the second mounting bracket (3). An iron sliding rod (9) is slidably connected to the L-shaped plate (8). A clamping tooth (10) is fixedly connected to one end of the iron sliding rod (9). A connecting piece (14) is fixedly connected to the iron sliding rod (9). The connecting piece (14) is connected to the L-shaped plate (8) through an elastic member (13). An internal grinding roller assembly is connected to the base (1). An external grinding assembly (38) is connected to one of the first mounting brackets (2).

2. The grinding device for an aluminum alloy die-casting part according to claim 1, characterized in that, The external grinding roller assembly includes a second electric push rod (18) and a lifting plate (19). The second electric push rod (18) is fixedly connected to the top wall of the base (1). The lifting plate (19) is fixedly connected to the movable part of the second electric push rod (18). A first C-shaped bracket (20) is fixedly connected to the lifting plate (19). A threaded hole (21) is formed in the first C-shaped bracket (20). An extension plate (28) is slidably connected to the lifting plate (19). A double-shaft motor (23) and a reducer (26) are fixedly connected to the extension plate (28). A grinding head (24) is fixedly connected to the output shaft on one side of the double-shaft motor (23). The output shaft on the other side of the double-shaft motor (23) is fixedly connected to the input shaft of the reducer (26). A threaded rod (27) is fixedly connected to the output shaft of the reducer (26). The threaded rod (27) is threadedly connected to the inner wall of the threaded hole (21).

3. The grinding device for an aluminum alloy die-casting part according to claim 2, characterized in that, A first permanent magnet (25) is fixedly connected to the grinding head (24). An automatic water pipe retractor (29) is fixedly connected to the top wall of the base (1). A water pipe body (30) is movably connected to the automatic water pipe retractor (29). A spray head assembly is fixedly connected to one end of the water pipe body (30). A second permanent magnet (33) is connected to the spray head assembly. A spray head support frame (34) is fixedly connected to the top wall of the base (1). The spray head support frame (34) supports the water pipe body (30). The water pipe body (30) is connected to an external water supply system.

4. The grinding device for an aluminum alloy die-casting part according to claim 3, characterized in that, The nozzle assembly includes a nozzle fixing part (31) and a nozzle rotating part (32). The nozzle fixing part (31) is fixedly connected to one end of the water pipe body (30). The nozzle rotating part (32) is rotatably connected to the nozzle fixing part (31). The second permanent magnet (33) is fixedly connected to the nozzle rotating part (32). A water passing channel (35) is formed in the nozzle fixing part (31). A water cavity (37) is formed in the nozzle rotating part (32). The water cavity (37) communicates with the outer wall of the nozzle rotating part (32) through two or more water outlet channels (36). The water cavity (37) communicates with the water passing channel (35).

5. The grinding device for an aluminum alloy die-casting part according to claim 4, wherein An extension part is provided on the first permanent magnet (25), and a groove is formed in the second permanent magnet (33).

6. The grinding device for an aluminum alloy die-casting part according to claim 5, characterized in that, An electric valve is connected to the inner wall of the water passing channel (35), and a distance measuring sensor is connected to the nozzle fixing part (31).

7. The grinding device for an aluminum alloy die-casting part according to claim 6, characterized in that, A controller is provided on the base (1).

8. The grinding device for an aluminum alloy die-casting part according to claim 7, characterized in that, The movable part of the second electric push rod (18) is fixedly connected to the lifting plate (19) through a second C-shaped frame (22).

9. The grinding device for an aluminum alloy die-casting part according to claim 8, characterized in that, Two or more balls (15) are rotatably connected to the transmission piece (17).

10. A grinding method for aluminum alloy die castings, characterized in that It includes using a grinding device for aluminum alloy die-castings according to any one of claims 1-9 to grind a workpiece (39). The workpiece (39) is placed on two support roller groups (6). The driving roller group (5) is used to press the workpiece (39). The inner wall of the workpiece (39) is ground by an internal grinding roller assembly. The outer wall of the workpiece (39) is ground by an external grinding assembly (38).

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