Grinding device and grinding method for inner curved surface of steel casting

Abstract

The invention discloses a polishing device and a polishing method for an inner curved surface of a steel casting, and relates to the technical field of cast steel production. The device comprises a main body frame and a polishing device, wherein the main body frame comprises a mounting table arranged on the main body frame; the stirring mechanism comprises a plurality of profiling plates which are mounted on the mounting table and used for stirring abrasive particle flow in the casting blank, and a plurality of rotating wheels are rotationally mounted on the inner wall of each profiling plate; the back pressure mechanism is used for driving the profiling plate to enter the casting blank; the rotating wheel is driven to rotate through resistance of abrasive particle flow, so that the abrasive particle flow completes switching between the distance from the abrasive particle flow to the central axis of the casting blank, and meanwhile, in the revolution process of the profiling plate, the abrasive particle flow in the casting blank is extruded up and down in a reciprocating mode through the action of a reciprocating mechanism; and the abrasive particle flow circularly polishes the inner wall of the casting blank up and down, so that the purposes of fully switching and contacting the abrasive particle flow and the inner wall of the casting blank, ensuring the polishing quality and improving the polishing efficiency are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of cast steel production, and particularly relates to a grinding device and a grinding method for the inner curved surface of a cast steel part. Background Art

[0002] At present, with the development of industry, casting has become an important way for workpiece forming. Casting is a processing method in which solid metal is melted into liquid and poured into a mold with a specific shape, and then solidified. The strength of the workpiece formed by casting in one piece is more stable. In the actual production process, the casting method will be selected according to the properties of the workpiece to improve the quality of the casting product.

[0003] At present, after the casting operation of the workpiece is completed, it is necessary to grind the inside of the workpiece. The existing grinding equipment uses grinding wheels for grinding against a flat surface. When grinding a curved surface, using a grinding wheel greatly affects the grinding quality and efficiency. Therefore, generally, after grinding with a grinding wheel, manual secondary supplementary grinding is required, which greatly reduces the production speed of the casting product.

[0004] Based on this, the present invention designs a grinding device and a grinding method for the inner curved surface of a cast steel part to solve the above problems. Summary of the Invention

[0005] The purpose of the embodiments of the present invention is to provide a grinding device and a grinding method for the inner curved surface of a cast steel part, aiming to solve the technical problems existing in the prior art mentioned in the background art.

[0006] The embodiments of the present invention are implemented as follows. A grinding device for the inner curved surface of a cast steel part, the device includes:

[0007] Main body frame: including a mounting table provided on the main body frame;

[0008] Agitating mechanism: including a plurality of profiling plates installed on the mounting table for agitating the abrasive flow inside the casting blank, and a plurality of rotating wheels are rotatably installed on the inner wall of each profiling plate;

[0009] Backpressure mechanism: used to drive the profiling plate into the inside of the casting blank;

[0010] Feeding mechanism: used to inject abrasive flow into the casting blank;

[0011] Reciprocating mechanism: used to extrude the abrasive flow inside the casting blank;

[0012] Sealing mechanism: used to seal the casting blank by the drive of the moving mechanism.

[0013] Further, the backpressure mechanism includes a plurality of backpressure rods installed on the mounting table. A moving block is fixedly installed on the surface of each backpressure rod. A tension spring is fixedly installed on the surface of the moving block. A swing rod is rotatably installed on the surface of the moving block. The other end of the swing rod is rotatably connected to an L-shaped rod. A profiling plate is fixedly installed on the surface of the L-shaped rod.

[0014] Furthermore, the feeding mechanism includes a feeding pipe, an air flow pipe, an output pipe, and a recovery pipe installed on the mounting table. Valves are provided on the feeding pipe, the air flow pipe, the output pipe, and the recovery pipe. At the same time, a pressure gauge is provided on the output pipe. The feeding pipe and the air flow pipe are fixedly installed on a moving plate. The output pipe and the recovery pipe are fixedly installed on another moving plate. Through holes are provided at the fixed positions of the moving plate for the feeding pipe, the air flow pipe, the output pipe, and the recovery pipe. The other end of the feeding pipe is connected to an external conveying device. The other end of the air flow pipe is connected to an external air pump device. The other end of the output pipe is connected to an external conveying device. The other end of the recovery pipe is connected to an external recovery device. A rotating cylinder is rotatably installed on the surface of the moving plate. A circular groove is formed inside the rotating cylinder, and the circular groove is connected to two discharge ports provided on the rotating cylinder. The profiling plate and the L-shaped rod are both slidably connected to the rotating cylinder.

[0015] Furthermore, the reciprocating mechanism includes a wave cylinder fixedly installed on the moving plate. The wave trajectories of the two wave cylinders are arranged in a staggered manner. A reciprocating rod that cooperates with the wave cylinder penetrates through the inner wall of the rotating cylinder, and the rotating cylinder is slidably connected to the reciprocating rod. A spherical ball is provided at the contact end of the reciprocating rod and the wave cylinder. The surface of the reciprocating rod is connected to the rotating cylinder through a reciprocating spring. The other end of the reciprocating rod is connected to a reciprocating arc plate, and the reciprocating arc plate is slidably connected to the rotating cylinder.

[0016] Furthermore, the sealing mechanism includes a sealing rubber plate fixedly installed on the moving plate.

[0017] Furthermore, the rotating mechanism includes a rotating motor fixedly installed on the moving plate. The output end of the rotating motor penetrates through the moving plate and is rotatably connected to the moving plate. A rotating circular plate is fixedly installed at the output end of the rotating motor. The rotating circular plate is fixedly connected to the inner wall of the rotating cylinder. The backpressure rod penetrates through the rotating circular plate and is slidably connected to the rotating circular plate. The end of the tension spring away from the moving block is connected to the rotating circular plate.

[0018] Furthermore, the moving mechanism includes two moving motors fixedly installed on the mounting table. The output end of each moving motor penetrates through the mounting table and is rotatably connected to the mounting table. A rotating lead screw is fixedly installed at the output end of each moving motor. The rotating lead screw forms a screw pair transmission with a lead screw slider. Both lead screw sliders are slidably connected to the inner wall of the mounting table. Both lead screw sliders are fixedly connected to one of the moving plates.

[0019] The specific steps of the grinding method for the inner curved surface of the steel casting are as follows:

[0020] Step 1: Place the casting blank on the device and start the device. Through the driving action of the moving mechanism, the sealing mechanism squeezes and seals the casting blank.

[0021] Step 2: Inject abrasive flow into the interior of the casting blank through the feed pipe. After the interior of the casting blank is filled with the abrasive flow, continue to inject until the pressure gauge on the output pipe reaches the set pressure value. When the pressure value is reached, the output pipe opens to discharge the air inside, so that the interior of the casting blank is completely filled with the abrasive flow.

[0022] Step 3: Through the revolution of the profiling plate, the abrasive flow fully contacts and polishes the inner wall of the casting blank inside the casting blank. At the same time, through the movement of the rotating wheel and the reciprocating mechanism, the abrasive flow circulates.

[0023] Step 4: After the polishing is completed, open the valve of the air flow pipe to allow gas to enter the casting blank to discharge the abrasive flow for recovery.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. Through the driving action of the outside world, the profiling plate is driven to revolve, so that the abrasive flow inside the casting blank contacts the inner wall of the casting blank, achieving the purpose of automatically polishing the inner wall of the casting blank.

[0026] 2. The resistance of the abrasive flow drives the rotating wheel to rotate, enabling the abrasive flow to complete the switching between the distances from the central axis of the casting blank. At the same time, during the revolution of the profiling plate, through the action of the reciprocating mechanism, the abrasive flow inside the casting blank is reciprocally extruded up and down, so that the abrasive flow circulates up and down to polish the inner wall of the casting blank, thereby achieving the purpose of fully switching the contact between the abrasive flow and the inner wall of the casting blank, ensuring the polishing quality and improving the polishing efficiency. Brief Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of a polishing device for the inner curved surface of a steel casting provided by an embodiment of the present invention;

[0028] Figure 2 It is a schematic cross-sectional structure diagram of the present invention;

[0029] Figure 3 It is another schematic cross-sectional structure diagram of a polishing device for the inner curved surface of a steel casting of the present invention;

[0030] Figure 4 For the present invention Figure 3 The enlarged structural diagram at A;

[0031] Figure 5Another cross-sectional structural schematic diagram of the grinding device for the inner curved surface of a steel casting of the present invention;

[0032] Figure 6 For the present invention Figure 5 The enlarged structural schematic diagram at position B;

[0033] Figure 7 For the present invention Figure 5 The enlarged structural schematic diagram at position C.

[0034] In the attached drawings: 1. Main body frame; 101. Installation table; 2. Stirring mechanism; 201. Profiled plate; 202. Rotating wheel; 203. Casting blank; 3. Back pressure mechanism; 301. Back pressure rod; 302. Tensile spring; 303. Moving block; 304. Swing rod; 305. L-shaped rod; 4. Feeding mechanism; 401. Feeding pipe; 402. Moving plate; 403. Rotating cylinder; 404. Circular groove; 405. Discharge port; 406. Air flow pipe; 407. Output pipe; 408. Recovery pipe; 5. Reciprocating mechanism; 501. Wavy cylinder; 502. Reciprocating rod; 503. Reciprocating spring; 504. Reciprocating arc plate; 6. Sealing mechanism; 601. Sealing rubber plate; 7. Rotating mechanism; 701. Rotating motor; 702. Rotating circular plate; 8. Moving mechanism; 801. Moving motor; 802. Rotating lead screw; 803. Lead screw slider. Detailed implementation manners

[0035] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the attached drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0036] It can be understood that the terms "first", "second", etc. used in the present application may be used herein to describe various elements, but unless otherwise specified, these elements are not limited by these terms. These terms are only used to distinguish the first element from another element.

[0037] As Figure 1 , Figure 2 , Figure 3 and Figure 4 shown, in one embodiment, a grinding device for the inner curved surface of a steel casting is proposed, and the device includes:

[0038] Main body frame 1: including an installation table 101 provided on the main body frame 1;

[0039] Stirring mechanism 2: including a plurality of profiled plates 201 installed on the installation table 101 for stirring the abrasive flow inside the casting blank 203, and a plurality of rotating wheels 202 are rotatably installed on the inner wall of each profiled plate 201;

[0040] Backpressure mechanism 3: used to drive the profiling plate 201 into the interior of the casting blank 203;

[0041] Feeding mechanism 4: used to inject abrasive flow into the casting blank 203;

[0042] Reciprocating mechanism 5: used to reciprocally extrude the abrasive flow inside the casting blank 203 in a cycle;

[0043] Sealing mechanism 6: used to seal the casting blank 203 by the drive of the moving mechanism 8.

[0044] In the actual application of the embodiment of the present invention, when grinding the inner wall of the casting blank 203, as Figure 2 shown, at this time, the casting blank 203 is placed on the sealing mechanism 6 by an external grasping device. After completion, through the action of the moving mechanism 8, the upper sealing mechanism 6 moves downward to contact and squeeze the surface of the casting blank 203, so as to complete the sealing of the casting blank 203 through the sealing mechanism 6. At the same time, during the downward movement of the sealing mechanism 6, due to the internal extrusion reaction force of the backpressure mechanism 3, a plurality of profiling plates 201 enter the interior of the casting blank 203, as Figure 3 shown. At this time, the feeding mechanism 4 is opened to make the abrasive flow enter the interior of the casting blank 203. When the entered abrasive flow and air reach a certain pressure inside the feeding mechanism 4, the valve of the feeding mechanism 4 is opened at this time to discharge the air inside the casting blank 203. After the air is discharged, the interior of the casting blank 203 is completely filled with the abrasive flow. At this time, the feeding mechanism 4 is closed, and the profiling plate 201 is driven to revolve by the action of an external drive, so that the abrasive flow inside the casting blank 203 contacts the inner wall of the casting blank 203, achieving the purpose of automatically grinding the inner wall of the casting blank 203, as Figure 4 shown. At the same time, during the revolution of the profiling plate 201, the rotating wheel 202 is driven to rotate by the resistance of the abrasive flow, so that the abrasive flow completes the switching between the distances from the central axis of the casting blank 203. At the same time, during the revolution of the profiling plate 201, through the action of the reciprocating mechanism 5, the abrasive flow inside the casting blank 203 is reciprocally extruded up and down, so that the abrasive flow circulates up and down to grind the inner wall of the casting blank 203, so as to achieve the purpose of making the abrasive flow fully switch and contact with the inner wall of the casting blank 203, ensuring the grinding quality and improving the grinding efficiency.

[0045] As Figure 4As shown, as a preferred embodiment of the present invention, the backpressure mechanism 3 includes a plurality of backpressure rods 301 installed on the mounting table 101. A moving block 303 is fixedly installed on the surface of each backpressure rod 301. A tension spring 302 is fixedly installed on the surface of the moving block 303. A swing rod 304 is rotatably installed on the surface of the moving block 303. The other end of the swing rod 304 is rotatably connected to an L-shaped rod 305. A profiling plate 201 is fixedly installed on the surface of the L-shaped rod 305.

[0046] In the actual application of the embodiment of the present invention, when the sealing mechanism 6 moves downward under the driving action of the moving mechanism 8, the upper backpressure rods 301 are driven to move downward at this time. The downward movement of the backpressure rods 301 squeezes the lower backpressure rods 301, causing the backpressure rods 301 to all move into the feeding mechanism 4. As Figure 4 shown, from Figure 4 the front view direction, at this time, the upward movement of the backpressure rods 301 drives the swing rod 304 to swing through the moving block 303, and then drives the L-shaped rod 305 to move away from the central axis of the casting blank 203. The movement of the L-shaped rod 305 drives the profiling plate 201 to extend out from the inside of the feeding mechanism 4. When the profiling plate 201 rotates around the axis, it drives the abrasive flow inside the casting blank 203 to rotate synchronously, so as to achieve the purpose of fully polishing the inner wall of the casting blank 203.

[0047] As Figure 2 shown, as another preferred embodiment of the present invention, the feeding mechanism 4 includes a feeding pipe 401, an air flow pipe 406, an output pipe 407, and a recovery pipe 408 installed on the mounting table 101. Valves are provided on the feeding pipe 401, the air flow pipe 406, the output pipe 407, and the recovery pipe 408. At the same time, a pressure gauge is provided on the output pipe 407. The feeding pipe 401 and the air flow pipe 406 are fixedly installed on a moving plate 402. The output pipe 407 and the recovery pipe 408 are fixedly installed on another moving plate 402. Through holes are provided in the moving plate 402 at the fixed positions of the feeding pipe 401, the air flow pipe 406, the output pipe 407, and the recovery pipe 408. The other end of the feeding pipe 401 is connected to an external conveying device. The other end of the air flow pipe 406 is connected to an external air pump device. The other end of the output pipe 407 is connected to an external conveying device. The other end of the recovery pipe 408 is connected to an external recovery device. A rotating cylinder 403 is rotatably installed on the surface of the moving plate 402. A circular groove 404 is provided inside the rotating cylinder 403, and the circular groove 404 is connected to two discharge ports 405 provided on the rotating cylinder 403. The profiling plate 201 and the L-shaped rod 305 are both slidably connected to the rotating cylinder 403.

[0048] In the actual application of the embodiment of the present invention, when the sealing operation of the casting blank 203 is completed, at this time, by opening the valve of the feed pipe 401, the abrasive flow enters the inside of the casting blank 203 through the through holes, the circular groove 404 and the discharge port 405 formed on the moving plate 402. When a certain pressure is reached, at this time, the valve of the output pipe 407 is opened to discharge the air inside the casting blank 203. After the air is discharged, the inside of the casting blank 203 is completely filled with the abrasive flow. At this time, the output pipe 407 is closed. After the inner wall of the casting blank 203 is polished by the revolution of the profiling plate 201, at this time, the valves of the air flow pipe 406 and the recovery pipe 408 are opened. By introducing air into the inside of the casting blank 203, the abrasive flow inside the casting blank 203 is discharged and recovered through the recovery pipe 408, so as to achieve the purpose of automatically recovering the abrasive flow.

[0049] As Figure 5 , Figure 6 and Figure 7 shown, as another preferred embodiment of the present invention, the reciprocating mechanism 5 includes a wave cylinder 501 fixedly installed on the moving plate 402, and the wave trajectories of the two wave cylinders 501 are arranged in a staggered manner. A reciprocating rod 502 matching with the wave cylinder 501 penetrates through the inner wall of the rotating cylinder 403, and the rotating cylinder 403 is slidably connected with the reciprocating rod 502. A spherical ball is arranged at the contact end of the reciprocating rod 502 and the wave cylinder 501. The surface of the reciprocating rod 502 is connected with the rotating cylinder 403 through a reciprocating spring 503. The other end of the reciprocating rod 502 is connected with a reciprocating arc plate 504, and the reciprocating arc plate 504 is slidably connected with the rotating cylinder 403.

[0050] In the actual application of the embodiment of the present invention, when the profiling plate 201 rotates around the center, as Figure 6 shown, at this time, the reciprocating rod 502 also rotates together. The rotation of the reciprocating rod 502 continuously contacts the wave cylinder 501, so that the reciprocating rod 502 continuously makes a reciprocating motion away from and towards the central axis of the casting blank 203. As Figure 7 shown, at this time, the reciprocating arc plate 504 is driven to make a reciprocating motion. Since the wave trajectories of the upper wave cylinder 501 and the lower wave cylinder 501 are arranged in a staggered manner, during the movement of the reciprocating arc plate 504, the abrasive flow inside the casting blank 203 will be reciprocally extruded, so that the abrasive flow continuously switches up and down, improving the switching efficiency of the abrasive flow, and further achieving the purpose of improving the polishing efficiency of the inner wall of the casting blank 203.

[0051] As Figure 2 shown, as another preferred embodiment of the present invention, the sealing mechanism 6 includes a sealing rubber plate 601 fixedly installed on the moving plate 402.

[0052] In the actual application of the embodiment of the present invention, when the positioning of the casting blank 203 is completed, asFigure 2 As shown in the figure, at this time, under the driving action of the moving mechanism 8, the upper sealing rubber plate 601 moves downward to contact and extrude the casting blank 203, and the sealing operation of the casting blank 203 is completed through the cooperation with the lower sealing rubber plate 601, so as to achieve the purpose of automatic sealing.

[0053] As Figure 2 shown, as another preferred embodiment of the present invention, the rotating mechanism 7 includes a rotating motor 701 fixedly installed on the moving plate 402. The output end of the rotating motor 701 penetrates through the moving plate 402 and is rotatably connected to the moving plate 402. A rotating circular plate 702 is fixedly installed at the output end of the rotating motor 701. The rotating circular plate 702 is fixedly connected to the inner wall of the rotating cylinder 403. The anti-pressure rod 301 penetrates through the rotating circular plate 702 and is slidably connected to the rotating circular plate 702. One end of the tension spring 302 away from the moving block 303 is connected to the rotating circular plate 702.

[0054] In the actual application of the embodiment of the present invention, when the injection of abrasive flow is completed, the rotating motor 701 starts to operate at this time. The operation of the rotating motor 701 drives the rotating circular plate 702 to rotate, and then drives the profiling plate 201 to revolve through the rotating cylinder 403. At the same time, the reciprocating rod 502 is driven to revolve through the rotating cylinder 403, so as to achieve the purpose of automatically revolving and fully grinding the inner wall of the casting blank 203.

[0055] As Figure 2 shown, as another preferred embodiment of the present invention, the moving mechanism 8 includes two moving motors 801 fixedly installed on the mounting table 101. The output end of each moving motor 801 penetrates through the mounting table 101 and is rotatably connected to the mounting table 101. A rotating lead screw 802 is fixedly installed at the output end of each moving motor 801. The rotating lead screw 802 forms a screw pair transmission with the lead screw slider 803. Both lead screw sliders 803 are slidably connected to the inner wall of the mounting table 101. Both lead screw sliders 803 are fixedly connected to one of the moving plates 402.

[0056] In the actual application of the embodiment of the present invention, when the positioning of the casting blank 203 is completed, the moving motor 801 starts to operate at this time. As Figure 2 shown, the operation of the moving motor 801 drives the upper moving plate 402 to move downward through the screw pair transmission, and then drives the upper sealing rubber plate 601 to move downward to contact and extrude the surface of the casting blank 203, and cooperate with the lower sealing rubber plate 601 to complete the sealing operation of the casting blank 203.

[0057] The specific steps of the grinding method for the inner curved surface of the steel casting are as follows:

[0058] Step 1: Place the casting blank 203 on the device and start the device. Under the driving action of the moving mechanism 8, the sealing mechanism 6 squeezes and seals the casting blank 203.

[0059] Step 2: Inject abrasive flow into the interior of the casting blank 203 through the feed pipe 401. After the interior of the casting blank 203 is filled with the abrasive flow, continue to inject until the pressure gauge on the output pipe 407 reaches the set pressure value. When the pressure value is reached, the output pipe 407 opens to discharge the air inside, so that the interior of the casting blank 203 is completely filled with the abrasive flow.

[0060] Step 3: Through the revolution of the profiling plate 201, the abrasive flow fully contacts and polishes the inner wall of the casting blank 203 inside the casting blank 203. At the same time, through the movement of the rotating wheel 202 and the reciprocating mechanism 5, the abrasive flow circulates.

[0061] Step 4: After the polishing is completed, open the valve of the air flow pipe 406 to allow gas to enter the casting blank 203 to discharge the abrasive flow for recovery.

[0062] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0063] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

[0064] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A grinding device for the inner curved surface of a cast steel part, characterized in that The device includes: Main body frame (1): including a mounting table (101) provided on the main body frame (1); Agitating mechanism (2): including a plurality of profiling plates (201) installed on the mounting table (101) for agitating the abrasive flow inside the casting blank (203), and a plurality of rotating wheels (202) are rotatably installed on the inner wall of each profiling plate (201); Backpressure mechanism (3): used to drive the profiling plate (201) into the interior of the casting blank (203); Feeding mechanism (4): used to inject abrasive flow into the casting blank (203); Reciprocating mechanism (5): used to extrude the abrasive flow inside the casting blank (203); Sealing mechanism (6): used to seal the casting blank (203) by the drive of the moving mechanism (8); The reciprocating mechanism (5) includes a corrugated cylinder (501) fixedly installed on the moving plate (402), and the corrugated trajectories of the two corrugated cylinders (501) are arranged in a staggered manner. A reciprocating rod (502) matching the corrugated cylinder (501) penetrates through the inner wall of the rotating cylinder (403). The surface of the reciprocating rod (502) is connected to the rotating cylinder (403) through a reciprocating spring (503), and the other end of the reciprocating rod (502) is connected to a reciprocating arc plate (504).

2. The grinding device for the inner curved surface of a cast steel part according to claim 1, wherein The backpressure mechanism (3) includes a plurality of backpressure rods (301) installed on the mounting table (101). A moving block (303) is fixedly installed on the surface of each backpressure rod (301). A tension spring (302) is fixedly installed on the surface of the moving block (303). A swing rod (304) is rotatably installed on the surface of the moving block (303). The other end of the swing rod (304) is rotatably connected to an L-shaped rod (305). A profiling plate (201) is fixedly installed on the surface of the L-shaped rod (305).

3. The grinding device for the inner curved surface of a cast steel part according to claim 2, characterized in that, The feeding mechanism (4) includes a feeding pipe (401), an air flow pipe (406), an output pipe (407) and a recovery pipe (408) installed on the installation table (101). Valves are provided on the feeding pipe (401), the air flow pipe (406), the output pipe (407) and the recovery pipe (408). At the same time, a pressure gauge is provided on the output pipe (407). The feeding pipe (401) and the air flow pipe (406) are fixedly installed on the moving plate (402), and the output pipe (407) and the recovery pipe (408) are fixedly installed on another moving plate (402). Through holes are provided at the fixed positions of the moving plate (402) for the feeding pipe (401), the air flow pipe (406), the output pipe (407) and the recovery pipe (408). The other end of the feeding pipe (401) is connected to an external conveying device, the other end of the air flow pipe (406) is connected to an external air pump device, the other end of the output pipe (407) is connected to an external conveying device, and the other end of the recovery pipe (408) is connected to an external recovery device. A rotating cylinder (403) is rotatably installed on the surface of the moving plate (402). A circular groove (404) is formed inside the rotating cylinder (403), and the circular groove (404) is connected to two discharge ports (405) formed on the rotating cylinder (403). The profiling plate (201) and the L-shaped rod (305) are both slidably connected to the rotating cylinder (403).

4. A grinding device for the inner curved surface of a cast steel part according to claim 3, characterized in that, The rotating cylinder (403) is slidably connected to the reciprocating rod (502). A spherical ball is provided at the contact end of the reciprocating rod (502) and the wave cylinder (501). The reciprocating arc plate (504) is slidably connected to the rotating cylinder (403).

5. A grinding device for the inner curved surface of a cast steel part according to claim 3, characterized in that, The sealing mechanism (6) includes a sealing rubber plate (601) fixedly installed on the moving plate (402).

6. A grinding device for the inner curved surface of a cast steel part according to claim 3, characterized in that, The device further includes a rotating mechanism (7). The rotating mechanism (7) includes a rotating motor (701) fixedly installed on the moving plate (402). The output end of the rotating motor (701) penetrates through the moving plate (402) and is rotatably connected to the moving plate (402). A rotating circular plate (702) is fixedly installed at the output end of the rotating motor (701). The rotating circular plate (702) is fixedly connected to the inner wall of the rotating cylinder (403). The anti-pressure rod (301) penetrates through the rotating circular plate (702) and is slidably connected to the rotating circular plate (702). One end of the tension spring (302) away from the moving block (303) is connected to the rotating circular plate (702).

7. A grinding device for the inner curved surface of a cast steel part according to claim 3, characterized in that, The moving mechanism (8) includes two moving motors (801) fixedly installed on the installation table (101). The output end of each moving motor (801) penetrates through the installation table (101) and is rotatably connected to the installation table (101). The output end of each moving motor (801) is fixedly installed with a rotating lead screw (802). The rotating lead screw (802) forms a screw pair drive with the lead screw slider (803). Both lead screw sliders (803) are slidably connected to the inner wall of the installation table (101). Both lead screw sliders (803) are fixedly connected to one of the moving plates (402).

8. A grinding method for the inner curved surface of a cast steel part, applicable to the grinding device for the inner curved surface of the cast steel part described in any one of claims 1-7, characterized in that: The specific steps of the method for grinding the inner curved surface of the steel casting are as follows: Step 1: Place the casting blank (203) on the device and start the device. Under the driving action of the moving mechanism (8), the sealing mechanism (6) squeezes and seals the casting blank (203). Step 2: Inject abrasive flow into the interior of the casting blank (203) through the feed pipe (401). After the interior of the casting blank (203) is filled with the abrasive flow, continue to inject until the pressure gauge on the output pipe (407) reaches the set pressure value. When the pressure value is reached, the output pipe (407) opens to discharge the air inside, so that the interior of the casting blank (203) is completely filled with the abrasive flow. Step 3: Through the revolution of the profiling plate (201), the abrasive flow fully contacts and polishes the inner wall of the casting blank (203) inside the casting blank (203). At the same time, through the movement of the rotating wheel (202) and the reciprocating mechanism (5), the abrasive flow circulates. Step 4: After the polishing is completed, open the valve of the air flow pipe (406) to allow gas to enter the casting blank (203) to discharge the abrasive flow for recycling.

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