A diffuser abrasive particle flow device and method of use thereof

Abstract

The application belongs to the field of mechanical processing and discloses a diffuser abrasive grain flow device and a use method thereof. A clamp base flow-through hole is arranged on a clamp base, and an inner lower cover plate is connected to the clamp base flow-through hole through a support rod. A sealing gasket is arranged on the edge of the inner lower cover plate. An inner upper cover plate is arranged above the inner lower cover plate, and a sealing gasket is arranged on the edge of the inner upper cover plate. An outer support ring is connected to the upper end of the clamp base. A sealing gasket is arranged between the clamp base and the outer support ring. An outer upper cover plate is arranged above the outer support ring. An outer upper cover plate flow-through hole is arranged on the outer upper cover plate. A sealing gasket is arranged between the outer support ring and the outer upper cover plate. A space is left between the outer upper cover plate and the inner upper cover plate for the abrasive grain flow to enter a part channel of a part. The outer upper cover plate and the clamp base are detachably fixedly connected. The diffuser can be stably clamped, so that the diffuser can improve the roughness of an inner cavity channel of the diffuser through an abrasive grain flow processing technology.

Description

Technical Field

[0001] This invention belongs to the field of machining and relates to a process clamping device for abrasive flow machining of flow channels and cavities of parts with complex structures. Specifically, it is a diffuser abrasive flow device and its usage method. Background Technology

[0002] For parts with complex flow channel cavity structures, such as the pre-diffuser and diffuser commonly found in the combustion chamber casing of aero-engines, their flow channels are mainly used for high-speed airflow during engine operation. Since the surface roughness of the flow channels has a significant turbulence effect on the high-speed airflow, these parts generally have particularly high requirements for the surface roughness of their flow channels. The complex internal channels of diffusers, the large curvature of the blade profiles, and the presence of non-simple straight-face structures make it impossible to use automated machining for deburring and fine removal of excess material. Manual grinding tools also cannot penetrate deep into the cavity, making it difficult to ensure surface consistency. This directly affects the surface roughness of the flow channels, resulting in uneven surfaces of the internal channels and blades after casting, failing to meet the design drawing requirements. Abrasive flow machining allows abrasive grains to flow repeatedly along the flow channel profile, effectively grinding the flow channel and significantly improving its roughness. However, due to the complex structure of diffuser components and the lack of suitable mounting edges for clamping the components, effectively clamping the diffuser components is crucial for achieving abrasive flow machining of the diffuser flow channel. Summary of the Invention

[0003] To address the problems existing in the prior art, the present invention aims to provide a diffuser abrasive flow device and its usage method. The present invention can stably clamp the diffuser, enabling the diffuser to improve the roughness of the diffuser's internal cavity channel through abrasive flow processing.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A diffuser abrasive flow device includes a fixture base with a flow hole for the abrasive flow. An inner lower cover plate is connected to the fixture base above the flow hole via a support rod. The edge of the inner lower cover plate has a first sealing gasket that seals against the lower edge of the inner surface of the workpiece. An inner upper cover plate is located above the inner lower cover plate and can move vertically and be fixed in a preset position. The edge of the inner upper cover plate has a second sealing gasket that seals against the upper edge of the inner surface of the workpiece. The upper end of the fixture base is connected to… An outer support ring is provided, and a third sealing gasket is provided between the fixture base and the outer support ring to seal against the lower edge of the outer surface of the part; an outer upper cover plate is provided above the outer support ring, and an outer upper cover plate flow hole is provided on the outer upper cover plate for the abrasive grains to flow in; a fourth sealing gasket is provided between the outer support ring and the outer upper cover plate to seal against the upper edge of the outer surface of the part; a gap is left between the outer upper cover plate and the inner upper cover plate for the abrasive grains to flow into the part in the part channel; the outer upper cover plate and the fixture base are detachably fixedly connected.

[0006] Preferably, a plurality of support rods are provided, and the plurality of support rods are evenly distributed in the circumferential direction of the flow hole in the fixture base, and the space between adjacent support rods is sufficient for the abrasive grains to pass through.

[0007] Preferably, the support rod includes a support ring and a first screw disposed in the support ring. The upper and lower ends of the support ring abut against the lower surface of the inner lower cover plate and the upper surface of the fixture base, respectively. The first screw passes through the inner lower cover plate and the inner cavity of the support ring, and the lower end of the first screw is threadedly connected to the fixture base.

[0008] Preferably, the inner upper cover plate and the inner lower cover plate are connected by a central screw and a central nut. The head of the central screw faces downward and passes through the inner lower cover plate and the inner upper cover plate from bottom to top. The upper end of the central screw protrudes from the upper surface of the inner upper cover plate and is threadedly connected to the central nut.

[0009] Preferably, the outer circumferential edge of the third sealing gasket is connected to the upper end of the clamp base by a number of screws.

[0010] Preferably, the upper side of the third sealing gasket is provided with a positioning step for positioning the lower end of the outer support ring, and the lower side of the fourth sealing gasket is provided with a positioning step for positioning the upper end of the outer support ring.

[0011] Preferably, the fourth sealing gasket is in positioning contact with the lower end of the outer upper cover plate through a positioning step, the lower surface of the inner upper cover plate is in positioning contact with the second sealing gasket through a positioning step, and the first sealing gasket is in positioning contact with the edge of the inner lower cover plate through a positioning step.

[0012] Preferably, the structure for the detachable and fixed connection between the outer top cover plate and the fixture base includes a connecting screw, one end of which is rotatably connected to the upper outer edge of the fixture base, the other end of which is fitted with a connecting block, and a connecting block nut threaded onto the upper side of the connecting block on the connecting screw. The lower outer edge of the outer top cover plate is provided with a support platform for supporting the connecting block.

[0013] Preferably, the fixture base, inner lower cover plate, inner upper cover plate, outer support ring, and outer upper cover plate are uniformly rotating and coaxially arranged.

[0014] The present invention also provides a method for using the above-mentioned diffuser abrasive flow device, comprising the following process:

[0015] Remove the inner top cover, outer support ring and outer top cover, and make the lower edge of the inner surface of the part contact the first sealing gasket and the lower edge of the outer surface of the part contact the third sealing gasket.

[0016] Connect the inner upper cover plate and the inner lower cover plate so that the upper edge of the inner surface of the part contacts the second sealing gasket. Then adjust the distance between the inner upper cover plate and the inner lower cover plate and tighten them so that the lower edge of the inner surface of the part seals with the first sealing gasket, the first sealing gasket seals with the outer edge of the inner lower cover plate, the lower edge of the outer surface of the part seals with the third sealing gasket, the third sealing gasket seals with the upper end of the fixture base, the upper edge of the inner surface of the part seals with the second sealing gasket, and the second sealing gasket seals with the inner upper cover plate.

[0017] Next, place the fourth sealing gasket between the outer support ring and the outer top cover plate, and make contact with the upper edge of the outer surface of the part. Then, place the outer top cover plate on the fourth sealing gasket, and then fix the outer top cover plate to the fixture base so that the fourth sealing gasket seals with the upper edge of the outer surface of the part, and at the same time seals the outer top cover plate with the fixture base.

[0018] Then, the assembled diffuser abrasive flow device is placed in the abrasive flow device, and the abrasive flow device is started. The abrasive flow flows in from the flow hole of the outer top cover plate, and then flows into the part channel of the part through the space between the outer top cover plate and the inner top cover plate. After that, the abrasive flow flows along the part channel, and the surface of the part channel is ground during the flow process. After the abrasive flow flows out from the part channel, it flows out through the gap between the support rods and the flow hole of the fixture base.

[0019] The present invention has the following beneficial effects:

[0020] In the diffuser abrasive flow device of this invention, the upper and lower ends of the inner and outer surfaces of a part can be fixed by a fixture base, an inner lower cover plate, an inner upper cover plate, and an outer upper cover plate, thereby achieving clamping of the part. Simultaneously, sealing gaskets are provided at the upper and lower ends of both the inner and outer surfaces of the part, thus solving the sealing problem. Finally, only the part to be processed (i.e., the part channel) is exposed to the abrasive flow path. Furthermore, the fixture base flow hole on the fixture base, the outer upper cover plate flow hole on the outer upper cover plate, and the spacing between the support rods between the fixture base and the inner lower cover plate provide a smooth flow channel for the abrasive flow, thereby enabling the processing of the diffuser channel using abrasive flow machining technology and improving the roughness of the diffuser's internal channel. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the diffuser abrasive flow device in an embodiment of the present invention.

[0022] In the figure, 1-clamp base, 1-1-clamp base flow hole, 2-support rod, 3-inner lower cover plate, 4-part, 4-1-part channel, 4-2-inner surface, 4-3-outer surface, 5-sealing gasket, 6-inner upper cover plate, 7-connecting screw, 8-connecting block, 9-connecting block nut, 10-outer upper cover plate, 10-1-outer upper cover plate flow hole, 11-center nut, 12-center screw, 13-outer support ring. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] See Figure 1The diffuser abrasive flow device of this embodiment includes a fixture base 1, which has a fixture base flow hole 1-1 for the abrasive flow to flow out. An inner lower cover plate 3 is connected to the fixture base 1 above the fixture base flow hole 1-1 via a support rod 2. The edge of the inner lower cover plate 3 has a first sealing gasket that seals against the lower edge of the inner surface of the part 4 to be processed. Above the inner lower cover plate 3 is an inner upper cover plate 6 that can move up and down and be fixed in a preset position. The edge of the inner upper cover plate 6 has a second sealing gasket that seals against the upper edge of the inner surface of the part 4. An outer support is connected to the upper end of the fixture base 1. A third sealing gasket is provided between the ring 13, the fixture base 1, and the outer support ring 13, which is in sealing contact with the lower edge of the outer surface of the part 4; an outer upper cover plate 10 is provided above the outer support ring 13, and an outer upper cover plate flow hole 10-1 is provided on the outer upper cover plate 10 for the abrasive flow to enter; a fourth sealing gasket is provided between the outer support ring 13 and the outer upper cover plate 10, which is in sealing contact with the upper edge of the outer surface of the part 4; a gap is left between the outer upper cover plate 10 and the inner upper cover plate 6 for the abrasive flow to enter the part 4 in the part channel 4-1; the outer upper cover plate 10 and the fixture base 1 are detachably fixedly connected.

[0025] The method of using the diffuser abrasive flow device provided in the above embodiments of the present invention includes the following process:

[0026] Remove the inner top cover plate 6, the outer support ring 13 and the outer top cover plate 10, and make the lower edge of the inner surface of part 4 contact the first sealing gasket and the lower edge of the outer surface of part 4 contact the third sealing gasket.

[0027] Connect the inner upper cover plate 6 and the inner lower cover plate 3 so that the upper edge of the inner surface of part 4 contacts the second sealing gasket. Then adjust the distance between the inner upper cover plate 6 and the inner lower cover plate 3 and tighten them so that the lower edge of the inner surface of part 4 is sealed with the first sealing gasket, the first sealing gasket is sealed with the outer edge of the inner lower cover plate 3, the lower edge of the outer surface of part 4 is sealed with the third sealing gasket, the third sealing gasket is sealed with the upper end of the fixture base 1, the upper edge of the inner surface of part 4 is sealed with the second sealing gasket, and the second sealing gasket is sealed with the inner upper cover plate 6.

[0028] Next, the fourth sealing gasket is placed between the outer support ring 13 and the outer top cover plate 10, and contacts the upper edge of the outer surface of the part 4. Then, the outer top cover plate 10 is placed on the fourth sealing gasket, and then the outer top cover plate 10 is fixedly connected to the fixture base 1, so that the fourth sealing gasket seals the upper edge of the outer surface of the part 4, and at the same time, the outer top cover plate 10 is sealed to the fixture base 1.

[0029] The assembled diffuser abrasive flow device is then placed in the abrasive flow device. The abrasive flow device is activated, and the abrasive flow enters through the flow hole 10-1 in the outer upper cover plate, then flows through the space between the outer upper cover plate 10 and the inner upper cover plate 6 into the part channel 4-1 of part 4. The abrasive flow then flows along the part channel 4-1, grinding the surface of the part channel 4-1 during the flow. After exiting the part channel 4-1, the abrasive flow exits through the gap between the support rods 2 and the flow hole 1-1 in the fixture base. The flow path of the abrasive flow is shown in the figure. Figure 1 The arrow direction in the image. If reverse flow of the abrasive flow is required (relative to...) Figure 1 When the direction shown is as indicated, the flow hole 1-1 of the fixture base serves as the inlet for the abrasive flow, and the flow hole 10-1 of the outer cover plate serves as the outlet for the abrasive flow. When the abrasive flow passes through part 4, it can remove a small amount of protrusions on the blades and channel walls of part 1, reducing surface roughness and enabling grinding of complex casting channels and blade profiles. This allows the roughness of the channel walls and blade profiles of the casting parts to be controlled within a certain range, thereby achieving uniformity and consistency of the wall appearance during processing.

[0030] In a preferred embodiment of the present invention, several support rods 2 are provided, and the several support rods 2 are evenly distributed in the circumferential direction of the flow hole 1-1 of the fixture base, and the space between adjacent support rods 2 can allow the abrasive grains to flow through.

[0031] In a preferred embodiment of the present invention, the support rod 2 includes a support ring and a first screw disposed within the support ring. The upper and lower ends of the support ring abut against the lower surface of the inner lower cover plate 3 and the upper surface of the clamp base 1, respectively. The first screw penetrates the inner cavity of the inner lower cover plate 3 and the support ring, and its lower end is threadedly connected to the clamp base 1. In this structure, the first screw enables detachable and fixed installation between the inner lower cover plate 3 and the clamp base 1, facilitating assembly and maintenance.

[0032] In a preferred embodiment of the present invention, the inner upper cover plate 6 and the inner lower cover plate 3 are connected by a central screw 12 and a central nut 11. The head of the central screw 12 faces downwards and passes through the inner lower cover plate 3 and the inner upper cover plate 6 from bottom to top. The upper end of the central screw 12 protrudes from the upper surface of the inner upper cover plate 6 and is threadedly connected to the central nut 11. In the above structure, the head of the central screw 12 faces downwards, and the central nut 11 is located above the inner upper cover plate 6, thus facilitating the adjustment and fixing of the position between the inner upper cover plate 6 and the inner lower cover plate 3. At the same time, this mechanism can achieve slight up-and-down movement of the inner upper cover plate 6 by rotating the direction of the central nut 11, thereby achieving a slightly adjustable seal for the axial position of the part.

[0033] In a preferred embodiment of the present invention, the outer circumferential edge of the third sealing gasket is connected to the upper end of the fixture base 1 by several screws. Since it is used to support and seal the lower edge of the outer surface of part 4, the third sealing gasket can be fixed and generally does not need to be disassembled. Similarly, the first sealing gasket is used to support and seal the lower edge of the inner surface of part 4; generally, the first sealing gasket can be fixedly connected to the inner lower cover plate without disassembling it.

[0034] In a preferred embodiment of the present invention, the upper side of the third sealing gasket is provided with a positioning step for positioning the lower end of the outer support ring 13, and the lower side of the fourth sealing gasket is provided with a positioning step for positioning the upper end of the outer support ring 13. By providing these positioning steps, radial force can be provided to the third and fourth sealing gaskets, preventing displacement of the sealing gaskets due to the compression of abrasive particles, thus avoiding sealing failure.

[0035] In a preferred embodiment of the present invention, the fourth sealing gasket is positioned in contact with the lower end of the outer upper cover plate 10 via a positioning step, the lower surface of the inner upper cover plate 6 is positioned in contact with the second sealing gasket via a positioning step, and the first sealing gasket is positioned in contact with the edge of the inner lower cover plate 3 via a positioning step. Similarly, by setting the above-mentioned positioning steps, radial force can be provided to the first and second sealing gaskets, avoiding sealing failure caused by displacement of the sealing gaskets due to the extrusion of abrasive particles.

[0036] As a preferred embodiment of the present invention, in this embodiment, the structure for the detachable and fixed connection between the outer cover plate 10 and the clamp base 1 includes a connecting screw 7. One end of the connecting screw 7 is rotatably connected to the upper outer edge of the clamp base 1, and the other end of the connecting screw 7 is fitted with a connecting block 8. A connecting block nut 9 is threadedly connected to the upper side of the connecting block 8 on the connecting screw 7. A support platform for supporting the connecting block 8 is provided on the lower outer edge of the outer cover plate 10. In the above structure of this embodiment, when it is necessary to separate the outer top cover plate 10 from the fixture base 1, the connecting block nut 9 is loosened, so that the connecting block 8 is separated from the support platform on the outer top cover plate 10. Then, the connecting screw 7 is rotated away from the outer top cover plate 10, and the outer top cover plate 10 can be removed, thus separating the outer top cover plate 10 from the fixture base 1. When it is necessary to fasten the outer top cover plate 10 to the fixture base 1, the outer top cover plate 10 is placed on the fourth sealing gasket, and then the connecting screw 7 is rotated close to the outer top cover plate 10. Then, the connecting block 8 is slid so that the connecting block 8 presses against the upper edge of the support platform on the outer top cover plate 10. Then, the connecting block nut 9 is tightened, so that the outer top cover plate 10 and the fixture base 1 are fastened together. At the same time, the sealing contact between the fourth sealing gasket and the upper edge of the outer surface of the part 4, as well as the sealing between the outer top cover plate 10 and the fixture base 1, are achieved.

[0037] In a preferred embodiment of the present invention, the fixture base 1, the inner lower cover plate 3, the inner upper cover plate 6, the outer support ring 13, and the outer upper cover plate 10 are uniformly rotating and coaxially arranged. Similarly, part 4 is also a circular structure and is coaxially arranged with the fixture base 1. In addition, the sealing gaskets 5 (including the first sealing gasket, the second sealing gasket, the third sealing gasket, and the fourth sealing gasket) are also all circular structures and are coaxially arranged with the fixture base 1.

[0038] In the above-described solution of the present invention, the outer and inner walls of the part channel can be isolated from the fixture to form a flow channel. After the nut is tightened, the sealing surface can be in very tight contact with the part profile. By rotating the nut, the cover plate on the inner profile can not only achieve the clamping effect of the part, but also achieve precise micro-adjustment sealing of the part's local runout. After sealing, the abrasive moves back and forth in the channel to remove the protrusions on the channel surface and control the roughness of the part within 0.01 to 6.3 μm as required, thereby achieving uniformity and consistency of the channel and blade wall surface during processing and ensuring the roughness of complex channels and blades.

[0039] Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of the present invention.

Claims

1. A diffuser abrasive flow device, characterized in that, The fixture includes a fixture base (1), which has a fixture base flow hole (1-1) for abrasive particles to flow out. Above the fixture base flow hole (1-1), the fixture base (1) is connected to an inner lower cover plate (3) via a support rod (2). The edge of the inner lower cover plate (3) is provided with a first sealing gasket that seals with the lower edge of the inner surface of the part to be processed (4). Above the inner lower cover plate (3), there is an inner upper cover plate (6) that can move up and down and be fixed in a preset position. The edge of the inner upper cover plate (6) is provided with a second sealing gasket that seals with the upper edge of the inner surface of the part (4). An outer support ring (13) is connected to the upper end of the fixture base (1). (1) A third sealing gasket is provided between the outer support ring (13) and the outer support ring (13) to seal the lower edge of the outer surface of the part (4); an outer upper cover plate (10) is provided above the outer support ring (13), and an outer upper cover plate flow hole (10-1) is provided on the outer upper cover plate (10) for the abrasive flow to enter; a fourth sealing gasket is provided between the outer support ring (13) and the outer upper cover plate (10) to seal the upper edge of the outer surface of the part (4); a gap is left between the outer upper cover plate (10) and the inner upper cover plate (6) for the abrasive flow to enter the part (4) in the part channel (4-1); the outer upper cover plate (10) and the fixture base (1) are detachably fixedly connected; The upper side of the third sealing gasket is provided with a positioning step for positioning the lower end of the outer support ring (13), and the lower side of the fourth sealing gasket is provided with a positioning step for positioning the upper end of the outer support ring (13). The fourth sealing gasket is in positioning contact with the lower end of the outer top cover plate (10) through a positioning step, the lower surface of the inner top cover plate (6) is in positioning contact with the second sealing gasket through a positioning step, and the first sealing gasket is in positioning contact with the edge of the inner lower cover plate (3) through a positioning step. The structure for the detachable and fixed connection between the outer cover plate (10) and the fixture base (1) includes a connecting screw (7), one end of the connecting screw (7) is rotatably connected to the upper outer edge of the fixture base (1), the other end of the connecting screw (7) is fitted with a connecting block (8), a connecting block nut (9) is threaded on the upper side of the connecting block (8) on the connecting screw (7), and a support platform for supporting the connecting block (8) is provided on the lower outer edge of the outer cover plate (10).

2. The diffuser abrasive flow device according to claim 1, characterized in that, The support rods (2) are provided in several ways. The support rods (2) are evenly distributed in the circumferential direction of the flow hole (1-1) of the fixture base. The space between adjacent support rods (2) can allow the abrasive particles to pass through.

3. The diffuser abrasive flow device according to claim 1, characterized in that, The support rod (2) includes a support ring and a first screw disposed in the support ring. The upper and lower ends of the support ring abut against the lower surface of the inner lower cover plate (3) and the upper surface of the fixture base (1), respectively. The first screw passes through the inner lower cover plate (3) and the inner cavity of the support ring. The lower end of the first screw is threadedly connected to the fixture base (1).

4. The diffuser abrasive flow device according to claim 1, characterized in that, The inner upper cover plate (6) and the inner lower cover plate (3) are connected by a central screw (12) and a central nut (11). The head of the central screw (12) faces downward and passes through the inner lower cover plate (3) and the inner upper cover plate (6) from bottom to top. The upper end of the central screw (12) protrudes from the upper surface of the inner upper cover plate (6) and is threadedly connected to the central nut (11).

5. A diffuser abrasive flow device according to claim 1, characterized in that, The outer edge of the third sealing gasket is connected to the upper end of the clamp base (1) by several screws.

6. A diffuser abrasive flow device according to claim 1, characterized in that, The fixture base (1), inner lower cover plate (3), inner upper cover plate (6), outer support ring (13) and outer upper cover plate (10) are uniformly rotating structures and are coaxially arranged.

7. A method of using the diffuser abrasive flow device according to any one of claims 1-6, characterized in that, The process includes the following: Remove the inner top cover plate (6), the outer support ring (13) and the outer top cover plate (10), and bring the lower edge of the inner surface of part (4) into contact with the first sealing gasket and the lower edge of the outer surface of part (4) into contact with the third sealing gasket; Connect the inner upper cover plate (6) and the inner lower cover plate (3) so that the upper edge of the inner surface of the part (4) contacts the second sealing gasket. Then adjust the distance between the inner upper cover plate (6) and the inner lower cover plate (3) and tighten them so that the lower edge of the inner surface of the part (4) seals with the first sealing gasket, the first sealing gasket seals with the outer edge of the inner lower cover plate (3), the lower edge of the outer surface of the part (4) seals with the third sealing gasket, the third sealing gasket seals with the upper end of the fixture base (1), the upper edge of the inner surface of the part (4) seals with the second sealing gasket, and the second sealing gasket seals with the inner upper cover plate (6). Then, the fourth sealing gasket is placed between the outer support ring (13) and the outer top cover plate (10), and it contacts the upper edge of the outer surface of the part (4). Then, the outer top cover plate (10) is placed on the fourth sealing gasket. Then, the outer top cover plate (10) is fixedly connected to the fixture base (1), so that the fourth sealing gasket seals the upper edge of the outer surface of the part (4), and at the same time, the outer top cover plate (10) is sealed to the fixture base (1). Then, the assembled diffuser abrasive flow device is set in the abrasive flow device, and the abrasive flow device is started. The abrasive flow flows in from the flow hole (10-1) of the outer upper cover plate, and then flows into the part channel (4-1) of the part (4) through the space between the outer upper cover plate (10) and the inner upper cover plate (6). Then the abrasive flow flows along the part channel (4-1). During the flow, the surface of the part channel (4-1) is ground. After the abrasive flow flows out from the part channel (4-1), it flows out through the gap between the support rods (2) and the flow hole (1-1) of the fixture base.

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