A process and apparatus for polishing the inner wall of a casting

Abstract

The application discloses a cast inner wall polishing process and device, and relates to the polishing technology field.The device comprises a base, a polishing disc, an adjusting mechanism and a rotating mechanism; the adjusting mechanism realizes the up-down displacement, the inclination angle and the rotation angle adjustment of the polishing disc through a movable seat, a rotating seat, a displacement frame and a connecting rod assembly; the rotating mechanism drives the polishing disc to rotate through multi-stage bevel gear transmission.The process comprises eight steps of surface pretreatment, cleaning and protection, rough grinding, fine grinding, polishing, abrasive flow polishing, thorough cleaning and quality inspection.The multi-degree-of-freedom adjusting mechanism makes the polishing disc flexibly adapt to the complex inner wall structure, can uniformly polish the inner part of the cast and eliminate the polishing dead angle; in cooperation with the abrasive flow polishing process, the micro burrs can be effectively removed, the surface smoothness and the processing efficiency are significantly improved, and the device has the advantages of convenient operation, safety and high efficiency, strong adaptability and high processing quality.

Description

Technical Field

[0001] This invention relates to the field of grinding and polishing technology, specifically a grinding and polishing process and apparatus for the inner wall of castings. Background Technology

[0002] Grinding and polishing of castings is a crucial process in the casting production workflow, directly affecting the dimensional accuracy, surface quality, and performance of the product. In the production of large castings (such as the casing of a split-case pump), grinding and polishing of the inner walls is particularly difficult. Due to the narrow and deep internal space of the casting, operators must manually insert grinding equipment into the interior, which is not only physically demanding but also makes it difficult to reach deeper areas, easily leading to uneven grinding or missed areas.

[0003] Currently, grinding the inner walls of castings mainly relies on manual operation, using tools such as angle grinders and belt sanders for rough and fine grinding. However, manual grinding has the following prominent problems:

[0004] 1. Efficiency and precision are difficult to achieve simultaneously: A survey shows that manual grinding of a single part takes 30-50 minutes, with a pass rate of only 80-85% and a rework rate as high as 18%. The surface roughness of manual grinding fluctuates between Ra 3.2-6.3μm, while high-end hydraulic valve bodies require Ra ≤ 1.6μm, making it difficult to meet precision machining requirements. For pipe-like components with small inner diameters but long lengths, uneven force during manual grinding results in visible machining marks on the inner surface, leading to an uneven surface.

[0005] 2. High labor intensity and significant safety hazards: The grinding section accounts for a large number of workplace injuries in the foundry, with the main causes including metal splatter and dust inhalation. Workers are also exposed to high-decibel noise levels for extended periods, resulting in persistently high occupational health risks.

[0006] 3. Automated grinding faces technological bottlenecks: Although some companies have attempted to introduce robotic arms or automated equipment, existing solutions have many limitations. For example, robotic grinding solutions involve high investment, poor autonomy (key components need to be imported), difficult maintenance, and insufficient grinding pressure. Furthermore, due to the diverse and unpredictable deformation patterns of castings during welding, automated grinding struggles to adapt to the inconsistencies in workpiece consistency. For complex curved casting cavities, existing automated equipment cannot adjust grinding quality based on sensory intuition like manual methods.

[0007] 4. Increasing Environmental Pressure: The dust concentration generated by traditional dry grinding generally exceeds 20 mg / m³, which is four times the national standard. When using chemical pickling to treat the inner wall, the weak acids and bases used are hazardous chemicals that pose a significant threat to the environment. As environmental protection requirements become more stringent, this method is gradually being phased out.

[0008] In summary, existing grinding techniques for the inner walls of castings suffer from problems such as inconvenient operation, difficulty in reaching deep areas, uneven grinding, low efficiency, and numerous safety hazards. There is an urgent need for a polishing device that can flexibly adjust the position and angle of the grinding head, adapt to complex inner wall structures, and perform efficient and uniform grinding deep into the interior of castings. Summary of the Invention

[0009] The purpose of this invention is to provide a grinding and polishing process and apparatus for the inner wall of castings, so as to facilitate grinding and polishing of the inner wall of castings.

[0010] To achieve the above objectives, the present invention provides the following technical solution: a grinding and polishing device for the inner wall of a casting, comprising a polishing apparatus, including a base and a polishing disc, wherein a roller is installed at the bottom end of the base, and a mounting seat is fixedly connected to the top end of the base, the position of the polishing disc is adjusted by an adjustment mechanism, and the polishing disc is driven to rotate by a rotation mechanism, the adjustment mechanism including a movable groove, the movable groove being formed on the outer wall of the mounting seat, a movable seat being slidably connected to the inner wall of the movable groove, a rotating seat being rotatably connected inside the movable seat, a toothed ring being fixedly connected to the outer wall of the movable seat, a displacement frame extending to the bottom of the rotating seat being slidably connected inside the rotating seat, a first threaded rod penetrating the displacement frame being rotatably connected inside the rotating seat, a rotating block being fixedly connected to the bottom end of the first threaded rod, and a locking block being fixedly connected to the outer wall of the displacement frame.

[0011] As a further embodiment of the present invention: the adjusting mechanism further includes a support rod, the support rod being fixedly connected to one end of the rotating seat, a rotating rod being rotatably connected to one end of the support rod, a fixed rod being fixedly connected to the top end of the rotating rod, a connecting rod being rotatably connected to the top end of the fixed rod, a crossbar being rotatably connected to one end of the connecting rod, an adjusting seat being fixedly connected to the outer wall of the crossbar, the adjusting seat being slidably connected to the interior of the rotating seat, a rotating column being rotatably connected to the outer wall of the rotating seat, and a second threaded rod being fixedly connected to the outer wall of the rotating column, the second threaded rod extending into the interior of the adjusting seat.

[0012] As a further embodiment of the present invention: the rotating mechanism includes a motor, which is mounted on the outer wall of the rotating seat and located below the rotating column. The output end of the motor is connected to a connecting shaft. One end of the connecting shaft is fixedly connected to a first bevel gear. The inside of the support rod is rotatably connected to a second bevel gear located on the outer wall of the first bevel gear. One end of the second bevel gear is fixedly connected to a third bevel gear. The third bevel gear is rotatably connected to the inside of the rotating rod. The inside of the rotating rod is rotatably connected to a fourth bevel gear located on the outer wall of the third bevel gear. One end of the fourth bevel gear is fixedly connected to a mounting rod. The polishing disc is mounted on the outer wall of the mounting rod via a mounting mechanism.

[0013] As a further embodiment of the present invention: the installation mechanism includes a baffle, the baffle is fixedly connected to the outer wall of the installation rod, the outer wall of the baffle is fixedly connected to a threaded rod coaxially arranged with the installation rod, the outer wall of the baffle is provided with three or more positioning rods around the threaded rod, the outer wall of the polishing disc is provided with through holes and positioning grooves corresponding to the positions of the threaded rod and the positioning rods, and the threaded rod passes through the through hole, a washer is fitted on the outer wall and then a nut is threadedly connected.

[0014] As a further embodiment of the present invention: the inner wall of the movable groove is in contact with the outer wall of the movable seat, and limiting blocks are symmetrically fixedly connected to both sides of the movable seat. Limiting grooves are symmetrically formed on the inner wall of the movable groove, and the inner wall of the limiting groove is in contact with the outer wall of the limiting block.

[0015] As a further embodiment of the present invention: the outer wall of the toothed ring is provided with a slot, one end of the locking block engages with the slot, and the outer wall of the displacement frame is provided with a first threaded hole, which matches the first threaded rod.

[0016] As a further embodiment of the present invention: the outer wall of the adjusting seat is provided with a second threaded hole, which matches the second threaded rod.

[0017] As a further embodiment of the present invention: the first bevel gear meshes with the second bevel gear, and the fourth bevel gear meshes with the third bevel gear.

[0018] As a further embodiment of the present invention: the outer wall of the positioning rod is in contact with the inner wall of the positioning groove.

[0019] The grinding and polishing process for the inner wall of a casting described in this invention comprises the following specific steps:

[0020] Step 1: Surface pretreatment; Use a belt abrasive or angle grinder to remove welds, burrs, and obvious defects from the inner wall of the casting to provide a base surface for subsequent polishing processes;

[0021] Step 2: Cleaning and Protection; Thoroughly clean the inner wall of the casting to remove oil and rust, and shield and protect non-machined areas;

[0022] Step 3: Rough grinding; Use a belt abrasive or grinding wheel with coarse-grit abrasive belt to remove most of the machining marks and burrs on the inner wall surface;

[0023] Step 4: Fine grinding; Replace with fine-grit abrasive belt to further eliminate traces left by the coarse grinding process and make the inner wall surface more uniform;

[0024] Step 5: Grinding and polishing; Polish the inner wall of the casting using the casting inner wall grinding and polishing device. The specific operation is as follows: Move the base to insert the polishing disc into the inner wall of the casting, adjust the up and down position, tilt angle and rotation angle of the polishing disc through the adjustment mechanism, start the rotation mechanism to drive the polishing disc to rotate, and grind and polish the inner wall of the casting.

[0025] Step Six: Abrasive Flow Polishing; A semi-fluid medium containing abrasive is extruded through the inner wall of the casting, and micro-burrs are removed and polished through friction. It is particularly suitable for complex internal cavity structures.

[0026] Step 7: Thorough cleaning; After polishing, use clean water or ultrasonic cleaning to remove all residual abrasive media and particles from the inner wall surface;

[0027] Step 8: Quality Inspection; Use a roughness tester to measure the surface roughness Ra value of the inner wall, and visually inspect the smoothness and uniformity to ensure that it meets the quality requirements.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. Flexible adjustment with multiple degrees of freedom to adapt to complex internal wall structures; by setting an adjustment mechanism, the up and down displacement, tilt angle adjustment and rotation angle adjustment of the polishing disc can be realized, so that the grinding head can flexibly adapt to the complex curved surface and different depths of the inner wall of the casting, solving the problem that manual grinding is difficult to reach deep places and existing automated equipment cannot adapt to the inconsistencies of workpieces.

[0030] 2. Deeply penetrates the inner cavity for efficient operation, eliminating grinding dead angles; the movable base can extend the polishing disc deep into the inner wall of the casting for grinding operations. Combined with the fine adjustment of the adjustment mechanism, it ensures that all parts of the inner wall are evenly stressed, eliminating dead angles and processing marks that are difficult to avoid in traditional manual grinding, and significantly improving the smoothness and uniformity of the inner wall surface.

[0031] 3. The structure is reasonably designed and the operation is convenient and safe. The device adopts a modular design with a high degree of integration between the adjustment mechanism and the rotation mechanism. The operator can easily complete the multi-dimensional adjustment of the grinding head through the rotating block, rotating column and other components. There is no need to hold heavy objects and go deep into the casting, which greatly reduces the labor intensity and avoids the safety hazards such as metal splash and dust inhalation during manual grinding.

[0032] 4. Easy to install and disassemble, adaptable to various working conditions; the installation mechanism adopts a positioning rod and positioning groove design, which is fixed with threaded rod and nut, and can realize the quick installation and disassembly of polishing disc. It is convenient to change polishing discs of different grit according to different grinding stages (coarse grinding, fine grinding, polishing), thereby improving the equipment's versatility and work efficiency.

[0033] 5. The transmission system is stable and reliable, and the grinding precision is high. The rotating mechanism adopts multi-stage bevel gear transmission, which ensures smooth power transmission and high rotational precision of the grinding head. It can effectively control vibration and offset during the grinding process, ensuring that the surface roughness after grinding meets the requirements of precision machining (Ra≤1.6μm) and improve the product qualification rate.

[0034] 6. The polishing process of this invention, through improved process design, forms a complete closed loop from surface pretreatment to quality inspection, with each process closely linked and clearly defined. Specifically, the abrasive flow polishing process is designed for complex internal cavity structures, using a semi-fluid medium containing abrasive particles to expel the material through the inner wall, effectively removing microscopic burrs and achieving a mirror-like polishing effect. The progressive particle size design of the three processes—rough grinding, fine grinding, and polishing—ensures a gradual surface treatment from coarse to fine, avoiding surface damage caused by skipping stages of grinding. The thorough cleaning process uses clean water or ultrasonic cleaning to ensure no abrasive media residue remains on the inner wall, avoiding the risk of particle wear during subsequent use. Compared with traditional manual polishing, this process can shorten the processing time per piece by more than 40%, increase the pass rate to over 95%, and, due to the high degree of process standardization, reduce reliance on operator skills, facilitating mass production and quality control. Attached Figure Description

[0035] Figure 1 This is a schematic diagram illustrating the usage state of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of the present invention;

[0037] Figure 3 This is a schematic diagram of the internal structure of the movable seat of the present invention;

[0038] Figure 4 This is a schematic diagram of the internal structure of the rotating seat and support rod of the present invention;

[0039] Figure 5 For the present invention Figure 4 Enlarged view of point A in the middle;

[0040] Figure 6 For the present invention Figure 4 Enlarged view of point B in the middle;

[0041] Figure 7 This is a schematic diagram of the internal structure of the support rod and the rotating rod of the present invention;

[0042] Figure 8 This is a schematic diagram of the installation of the polishing disc of the present invention.

[0043] In the diagram: 1. Base; 2. Roller; 3. Mounting seat; 4. Polishing disc; 5. Adjustment mechanism; 501. Movable groove; 502. Movable seat; 503. Rotating seat; 504. Gear ring; 505. Displacement frame; 506. First threaded rod; 507. Rotating block; 508. Locking block; 509. Support rod; 510. Rotating rod; 511. Fixed rod; 512. Connecting rod; 513. Crossbar; 514. Adjustment seat; 515. 516. Threaded rod; 6. Rotating column; 6. Rotating mechanism; 601. Motor; 602. Connecting shaft; 603. First bevel gear; 604. Second bevel gear; 605. Third bevel gear; 606. Fourth bevel gear; 607. Mounting rod; 7. Mounting mechanism; 701. Baffle; 702. Positioning rod; 703. Positioning groove; 704. Washer; 705. Nut; 706. Threaded rod; 8. Limiting groove; 9. Limiting block. Detailed Implementation

[0044] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that unless otherwise explicitly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The following describes embodiments of the invention based on its overall structure.

[0046] Please see Figures 1 to 7In this embodiment of the invention, a grinding and polishing device for the inner wall of a casting includes a polishing apparatus. The polishing apparatus includes a base 1 and a polishing disc 4. A roller 2 is installed at the bottom end of the base 1, and a mounting seat 3 is fixedly connected to the top end of the base 1. The position of the polishing disc 4 is adjusted by an adjusting mechanism 5. The polishing disc 4 is driven to rotate by a rotating mechanism 6. The adjusting mechanism 5 includes a movable groove 501, which is formed on the outer wall of the mounting seat 3. A movable seat 502 is slidably connected to the inner wall of the movable groove 501. A rotating seat 503 is rotatably connected inside the movable seat 502. A toothed ring 504 is fixedly connected to the outer wall of the movable seat 502. A displacement frame 505 extending below the rotating seat 503 is slidably connected inside the rotating seat 503. A first threaded rod 5 passing through the displacement frame 505 is rotatably connected inside the rotating seat 503. 06. A rotating block 507 is fixedly connected to the bottom end of the first threaded rod 506. A locking block 508 is fixedly connected to the outer wall of the displacement frame 505. The adjustment mechanism 5 also includes a support rod 509. The support rod 509 is fixedly connected to one end of the rotating seat 503. A rotating rod 510 is rotatably connected to one end of the support rod 509. A fixing rod 511 is fixedly connected to the top end of the rotating rod 510. A connecting rod 512 is rotatably connected to the top end of the fixing rod 511. A crossbar 513 is rotatably connected to one end of the connecting rod 512. An adjustment seat 514 is fixedly connected to the outer wall of the crossbar 513. The adjustment seat 514 is slidably connected to the inside of the rotating seat 503. A rotating column 516 is rotatably connected to the outer wall of the rotating seat 503. A second threaded rod 515 is fixedly connected to the outer wall of the rotating column 516. The second threaded rod 515 extends into the inside of the adjustment seat 514.

[0047] In this embodiment: the movable seat 502 is pushed to move within the movable groove 501, thereby causing the polishing disc 4 to move up and down; the rotating column 516 is rotated, which in turn causes the second threaded rod 515 to rotate, which in turn causes the adjusting seat 514 to move, which in turn causes the crossbar 513 to move, which in turn causes the fixed rod 511 to move via the connecting rod 512, which in turn causes the rotating rod 510 to rotate relative to the support rod 509, which in turn causes the polishing disc 4 to tilt; the rotating seat 503 is rotated, which in turn causes the rotating rod 510 to rotate via the support rod 509, thereby achieving further adjustment of the angle of the polishing disc 4. After adjustment, rotate the rotating block 507. The rotation of the rotating block 507 drives the first threaded rod 506 to rotate. The rotation of the first threaded rod 506 drives the displacement frame 505 to move. The displacement of the displacement frame 505 drives the locking block 508 to move. One end of the locking block 508 engages with the toothed ring 504 to fix the angle of the rotating seat 503, which facilitates the adjustment of the position and angle of the polishing disc 4 to adapt to the inner wall of the casting.

[0048] Please refer to this carefully. Figures 4 to 7The rotating mechanism 6 includes a motor 601, which is mounted on the outer wall of the rotating seat 503 and located below the rotating column 516. The output end of the motor 601 is connected to a connecting shaft 602. One end of the connecting shaft 602 is fixedly connected to a first bevel gear 603. The inside of the support rod 509 is rotatably connected to a second bevel gear 604 located on the outer wall of the first bevel gear 603. One end of the second bevel gear 604 is fixedly connected to a third bevel gear 605. The third bevel gear 605 is rotatably connected to the inside of the rotating rod 510. The inside of the rotating rod 510 is rotatably connected to a fourth bevel gear 606 located on the outer wall of the third bevel gear 605. One end of the fourth bevel gear 606 is fixedly connected to a mounting rod 607. The polishing disc 4 is mounted on the outer wall of the mounting rod 607 through the mounting mechanism 7.

[0049] In this embodiment: when the polishing disc 4 rotates, the motor 601 is started. The motor 601 rotates, driving the connecting shaft 602 to rotate. The rotation of the connecting shaft 602 drives the first bevel gear 603 to rotate, which in turn drives the second bevel gear 604 to rotate. The second bevel gear 604 then drives the third bevel gear 605 to rotate, which in turn drives the fourth bevel gear 606 to rotate. The fourth bevel gear 606 then drives the mounting rod 607 to rotate, which in turn drives the polishing disc 4 to rotate. The rotating polishing disc 4 polishes the inner wall of the casting. During the polishing operation, the base 1 is first moved to insert the polishing disc 4 into the inner wall of the casting, and then the inner wall of the casting can be polished.

[0050] Please refer to this carefully. Figures 7 to 8 The installation mechanism 7 includes a baffle 701, which is fixedly connected to the outer wall of the installation rod 607. A threaded rod 706 coaxially arranged with the installation rod 607 is fixedly connected to the outer wall of the baffle 701. Three or more positioning rods 702 (preferably four in this embodiment) are arranged around the threaded rod 706 on the outer wall of the baffle 701. Through holes and positioning grooves 703 are respectively opened on the outer wall of the polishing disc 4 corresponding to the positions of the threaded rod 706 and the positioning rods 702. After the threaded rod 706 passes through the through hole, a gasket 704 is fitted on the outer wall and then a nut 705 is threadedly connected to it.

[0051] In this embodiment: when installing the polishing disc 4, the polishing disc 4 is fitted onto the outer wall of the threaded rod 706 through the through hole in the central shaft, and contacts the baffle 701, so that the positioning rod 702 is inserted into the positioning groove 703 to position the polishing disc 4; then, the washer 704 is fitted onto the outer wall of the threaded rod 706 and contacts the polishing disc 4, and the nut 705 is screwed onto the threaded rod 706 to press the washer 704, thereby fixing the polishing disc 4. This design facilitates the quick installation and removal of the polishing disc 4, making it easy to replace the polishing disc 4 to adapt to different scenarios.

[0052] Please refer to this carefully. Figures 2 to 6 The inner wall of the movable groove 501 is in contact with the outer wall of the movable seat 502. Limiting blocks 9 are symmetrically fixedly connected to both sides of the movable seat 502. Limiting grooves 8 are symmetrically opened on the inner wall of the movable groove 501. The inner wall of the limiting groove 8 is in contact with the outer wall of the limiting block 9.

[0053] In this embodiment: the movable seat 502 is pushed to move within the movable groove 501, thereby causing the polishing disc 4 to move up and down.

[0054] Please refer to this carefully. Figures 2 to 6 The outer wall of the toothed ring 504 is provided with a slot, and one end of the locking block 508 engages with the slot. The outer wall of the displacement frame 505 is provided with a first threaded hole, which matches the first threaded rod 506.

[0055] In this embodiment: Rotating the rotating block 507 causes the first threaded rod 506 to rotate, which in turn causes the displacement frame 505 to move, and the displacement frame 505 causes the locking block 508 to move. One end of the locking block 508 engages with the toothed ring 504 to fix the angle of the rotating seat 503.

[0056] Please refer to this carefully. Figures 2 to 6 The outer wall of the adjusting seat 514 is provided with a second threaded hole, which matches the second threaded rod 515.

[0057] In this embodiment: rotating the rotating column 516 causes the second threaded rod 515 to rotate, the second threaded rod 515 rotates and causes the adjusting seat 514 to move, the adjusting seat 514 moves and causes the crossbar 513 to move, the crossbar 513 moves and causes the fixed rod 511 to move through the connecting rod 512, the fixed rod 511 moves and causes the rotating rod 510 to rotate relative to the support rod 509.

[0058] Please refer to this carefully. Figures 4 to 7 The first bevel gear 603 meshes with the second bevel gear 604, and the fourth bevel gear 606 meshes with the third bevel gear 605.

[0059] In this embodiment: the motor 601 drives the connecting shaft 602 to rotate, the connecting shaft 602 rotates and drives the first bevel gear 603 to rotate, the first bevel gear 603 rotates and drives the second bevel gear 604 to rotate, the second bevel gear 604 rotates and drives the third bevel gear 605 to rotate, the third bevel gear 605 rotates and drives the fourth bevel gear 606 to rotate, and the fourth bevel gear 606 rotates and drives the mounting rod 607 to rotate.

[0060] Please refer to this carefully. Figures 7 to 8The outer wall of the positioning rod 702 fits against the inner wall of the positioning groove 703.

[0061] In this embodiment: the polishing disc 4 is sleeved on the outer wall of the threaded rod 706 through the through hole in the central shaft and contacts the baffle 701, so that the positioning rod 702 is inserted into the positioning groove 703 to position the polishing disc 4; then the washer 704 is sleeved on the outer wall of the threaded rod 706 and contacts the polishing disc 4, and the nut 705 is screwed onto the threaded rod 706 to press the washer 704, thereby fixing the polishing disc 4.

[0062] A grinding and polishing device for the inner wall of castings, comprising the following specific steps:

[0063] Step 1: Surface pretreatment; Use a belt abrasive or angle grinder to remove welds, burrs, and obvious defects from the inner wall of the casting to provide a base surface for subsequent polishing processes;

[0064] Step 2: Cleaning and Protection; Thoroughly clean the inner wall of the casting to remove oil and rust, and shield and protect non-machined areas;

[0065] Step 3: Rough grinding; Use a belt abrasive or grinding wheel with coarse-grit abrasive belt to remove most of the machining marks and burrs on the inner wall surface;

[0066] Step 4: Fine grinding; Replace with fine-grit abrasive belt to further eliminate traces left by the coarse grinding process and make the inner wall surface more uniform;

[0067] Step 5: Grinding and polishing; The inner wall of the casting is polished using the aforementioned casting inner wall grinding and polishing device. The specific operation is as follows: Move the base 1 to insert the polishing disc 4 into the inner wall of the casting, adjust the up and down position, tilt angle and rotation angle of the polishing disc 4 through the adjustment mechanism 5, and start the rotation mechanism 6 to drive the polishing disc 4 to rotate, so as to grind and polish the inner wall of the casting.

[0068] Step Six: Abrasive Flow Polishing; A semi-fluid medium containing abrasive is extruded through the inner wall of the casting, and micro-burrs are removed and polished through friction. It is particularly suitable for complex internal cavity structures.

[0069] Step 7: Thorough cleaning; After polishing, use clean water or ultrasonic cleaning to remove all residual abrasive media and particles from the inner wall surface;

[0070] Step 8: Quality Inspection; Use a roughness tester to measure the surface roughness Ra value of the inner wall, and visually inspect the smoothness and uniformity to ensure that it meets the quality requirements.

[0071] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for grinding and polishing the inner wall of a casting, characterized in that, The polishing equipment includes a base (1) and a polishing disc (4). A roller (2) is installed at the bottom of the base (1), and a mounting seat (3) is fixedly connected to the top of the base (1). The position of the polishing disc (4) is adjusted by an adjustment mechanism (5), and the polishing disc (4) is driven to rotate by a rotation mechanism (6). The adjustment mechanism (5) includes a movable groove (501), which is opened on the outer wall of the mounting seat (3). A movable seat (502) is slidably connected to the inner wall of the movable groove (501). The movable seat (502) is rotatably connected to a rotating seat (503), and a toothed ring (504) is fixedly connected to the outer wall of the movable seat (502). The rotating seat (503) is slidably connected to a displacement frame (505) extending below the rotating seat (503). The rotating seat (503) is rotatably connected to a first threaded rod (506) penetrating the displacement frame (505). A rotating block (507) is fixedly connected to the bottom end of the first threaded rod (506). A locking block (508) is fixedly connected to the outer wall of the displacement frame (505). The adjustment mechanism (5) further includes a support rod (509), which is fixedly connected to one end of the rotating seat (503). One end of the support rod (509) is rotatably connected to a rotating rod (510). The top end of the rotating rod (510) is fixedly connected to a fixed rod (511). The top end of the fixed rod (511) is rotatably connected to a connecting rod (512). One end of the connecting rod (512) is rotatably connected to a crossbar (513). The outer wall of the crossbar (513) is fixedly connected to an adjustment seat (514). The adjustment seat (514) is slidably connected to the interior of the rotating seat (503). The outer wall of the rotating seat (503) is rotatably connected to a rotating column (516). The outer wall of the rotating column (516) is fixedly connected to a second threaded rod (515). The second threaded rod (515) extends into the interior of the adjustment seat (514). The rotating mechanism (6) includes a motor (601), which is mounted on the outer wall of the rotating seat (503) and located below the rotating column (516). The output end of the motor (601) is connected to a connecting shaft (602). One end of the connecting shaft (602) is fixedly connected to a first bevel gear (603). The inside of the support rod (509) is rotatably connected to a second bevel gear (604) on the outer wall of the first bevel gear (603). One end of the second bevel gear (604) is fixedly connected to a third bevel gear (605). The third bevel gear (605) is rotatably connected to the inside of the rotating rod (510). The inside of the rotating rod (510) is rotatably connected to a fourth bevel gear (606) on the outer wall of the third bevel gear (605). One end of the fourth bevel gear (606) is fixedly connected to a mounting rod (607). The polishing disc (4) is mounted on the outer wall of the mounting rod (607) through the mounting mechanism (7). The installation mechanism (7) includes a baffle (701), which is fixedly connected to the outer wall of the installation rod (607). A threaded rod (706) coaxially arranged with the installation rod (607) is fixedly connected to the outer wall of the baffle (701). Three or more positioning rods (702) are arranged around the threaded rod (706) on the outer wall of the baffle (701). Through holes and positioning grooves (703) are respectively opened on the outer wall of the polishing disc (4) corresponding to the positions of the threaded rod (706) and the positioning rods (702). After the threaded rod (706) passes through the through hole, a gasket (704) is fitted on the outer wall and then a nut (705) is threadedly connected to it.

2. The grinding and polishing device for the inner wall of a casting according to claim 1, characterized in that, The inner wall of the movable groove (501) is in contact with the outer wall of the movable seat (502). Limiting blocks (9) are symmetrically fixedly connected to both sides of the movable seat (502). Limiting grooves (8) are symmetrically opened on the inner wall of the movable groove (501). The inner wall of the limiting groove (8) is in contact with the outer wall of the limiting block (9).

3. The grinding and polishing device for the inner wall of a casting according to claim 1, characterized in that, The outer wall of the toothed ring (504) is provided with a slot, one end of the locking block (508) is engaged with the slot, and the outer wall of the displacement frame (505) is provided with a first threaded hole, which matches the first threaded rod (506).

4. The grinding and polishing device for the inner wall of a casting according to claim 1, characterized in that, The outer wall of the adjusting seat (514) is provided with a second threaded hole, which matches the second threaded rod (515).

5. The grinding and polishing device for the inner wall of a casting according to claim 1, characterized in that, The first bevel gear (603) meshes with the second bevel gear (604), and the fourth bevel gear (606) meshes with the third bevel gear (605).

6. The grinding and polishing device for the inner wall of a casting according to claim 1, characterized in that, The outer wall of the positioning rod (702) is in contact with the inner wall of the positioning groove (703).

7. The casting inner wall grinding and polishing process of the casting inner wall grinding and polishing device according to any one of claims 2-6, characterized in that, The specific steps are as follows: Step 1: Surface pretreatment; Use a belt abrasive or angle grinder to remove welds, burrs, and obvious defects from the inner wall of the casting to provide a base surface for subsequent polishing processes; Step 2: Cleaning and Protection; Thoroughly clean the inner wall of the casting to remove oil and rust, and shield and protect non-machined areas; Step 3: Rough grinding; Use a belt abrasive or grinding wheel with coarse-grit abrasive belt to remove most of the machining marks and burrs on the inner wall surface; Step 4: Fine grinding; Replace with fine-grit abrasive belt to further eliminate traces left by the coarse grinding process and make the inner wall surface more uniform; Step 5: Grinding and polishing; The inner wall of the casting is polished by a grinding and polishing device for the inner wall of the casting as described in any one of claims 2-6. The specific operation is as follows: the base (1) is moved to insert the polishing disc (4) into the inner wall of the casting. The upper and lower positions, tilt angle and rotation angle of the polishing disc (4) are adjusted by the adjustment mechanism (5). The rotation mechanism (6) is started to drive the polishing disc (4) to rotate and grind and polish the inner wall of the casting. Step Six: Abrasive Flow Polishing; A semi-fluid medium containing abrasive is extruded through the inner wall of the casting, and micro-burrs are removed and polished through friction. It is particularly suitable for complex internal cavity structures. Step 7: Thorough cleaning; After polishing, use clean water or ultrasonic cleaning to remove all residual abrasive media and particles from the inner wall surface; Step 8: Quality Inspection; Use a roughness tester to measure the surface roughness Ra value of the inner wall, and visually inspect the smoothness and uniformity to ensure that it meets the quality requirements.

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