A profiled abrasive grain flow clamp for inner hole finishing machining of a tee valve

Abstract

A profiled abrasive grain flow clamp for inner hole finishing processing of a tee valve is characterized by comprising a large upper cover, a support ring, a bottom large cover plate, a bottom small cover plate, a large end core mold, a small end core mold, a bottom core mold, an L-shaped column and a side plate. By placing the core mold in the valve flow channel, an abrasive flow channel following the inner wall surface of the valve body is formed, so that the abrasive flowing through the inner wall surface of the valve body has a faster flow rate and a larger pressure, thereby improving the material removal rate. By installing the core mold with a profiled structure, the uniformity of the abrasive processing of the inner wall surface of the valve body can be improved, thereby obtaining better inner wall surface quality. The abrasive is repeatedly circulated in the valve body, thereby removing casting defects, increasing the surface finish and also obtaining a relatively low valve body inner wall surface roughness. The present application effectively improves the processing efficiency and precision of the abrasive grain flow on the valve body inner cavity, and provides a new method for valve finishing.

Description

Technical Field

[0001] This invention belongs to the field of precision machining technology, and in particular to a fixture for machining the inner hole of a three-way valve, specifically a contour abrasive flow fixture for finishing the inner hole of a three-way valve. Background Technology

[0002] After casting, the complex shape of the valve body and the uneven surface quality make it difficult to ensure the workpiece's shape accuracy and surface quality consistency. As a liquid conveying pipeline, its internal surface roughness requirements are high. Traditional hand grinding is not only inefficient but also difficult, necessitating a more efficient polishing method for complex internal cavities. Abrasive flow finishing has significant advantages in material removal and finishing within complex flow channels. However, controlling the amount of material removed within complex flow channels is difficult. Furthermore, due to the complex internal flow channels of three-way valves, ordinary machine tools cannot directly perform abrasive flow machining on the valve body. Therefore, designing a three-way valve internal cavity machining fixture compatible with an abrasive flow machine tool is the only way to solve the problem of internal cavity finishing for such parts. Summary of the Invention

[0003] The purpose of this invention is to address the problem of difficulty in controlling the amount of material removed in various parts of complex flow channels during existing abrasive flow finishing processes, and to provide a contour abrasive flow fixture for finishing the inner cavity of a three-way valve.

[0004] The technical solution of this invention is:

[0005] A contour abrasive flow fixture for a three-way valve mainly consists of a large upper pressure cap, a support ring, a large bottom cover plate, a small bottom cover plate, a large end core mold, a small end core mold, a bottom core mold, an L-shaped column, and side plates.

[0006] The large upper pressure cover is disc-shaped, and its end face is in close contact with the upper abrasive cylinder of the abrasive flow machine tool. It has multiple fan-shaped holes for the abrasive to enter and exit. The upper cover plate has stepped protrusions for positioning with the support ring.

[0007] The support ring is cylindrical, and its diameter is equal to the diameter of the protrusions of the upper pressure plate and the bottom large cover plate, which fits tightly to prevent abrasive from overflowing.

[0008] The bottom large cover plate is disc-shaped, with a protrusion that matches the support ring, and a circular groove in the middle for placing the bottom small cover plate.

[0009] The bottom small cover plate is disc-shaped, with an outer circular hole for connecting to the bottom large cover plate and an inner circular hole for connecting to the bottom core mold, and has four circumferential grooves for abrasive flow.

[0010] The large-end core mold is a contoured structure of the inner wall of the valve body, with a round hole on its end face for connecting the side plate. The far end of the large-end core mold is a cylindrical combination to prevent interference with the bottom core mold.

[0011] The small end core mold is a contoured structure of the inner wall of the valve body, and its end face has a round hole for connecting the side plate.

[0012] The bottom core mold is a partial contour structure of the inner wall of the valve body, and its end face has a round hole for connecting the bottom cover plate.

[0013] The L-shaped column cooperates with the bottom large cover plate and the large upper pressure cover to clamp the side plate and thus fix the valve body.

[0014] The side plate has a round hole for fixing the large and small end core molds, and a circumferential groove for the flow of abrasive. The side plate is tightly fitted with the L-shaped column to fix the valve body.

[0015] Furthermore, the large-end core mold, small-end core mold, and bottom core mold are made of 3D printing resin. The valve body is cast and made of carbon steel.

[0016] Furthermore, the bottom cover plate is made of 45 steel and has four L-shaped slots for installing L-shaped columns.

[0017] Furthermore, the large bottom cover plate has multiple threaded holes for connecting the small bottom cover plate.

[0018] Furthermore, the distance from the center of the circumferential hole of the side plate to the bottom surface is equal to the distance from the center of the valve port (large end, small end) to the bottom cover plate.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] By adding a contour mandrel, the flow velocity and pressure of the abrasive flowing through the inner wall of the valve body are increased, improving the material removal rate. Furthermore, the flow channel area through the valve cavity is reduced, thereby improving processing efficiency.

[0021] Compared to not using a core mold, the material removal rate of the valve body's inner wall is more uniform and there is no local over-polishing phenomenon, which ensures the integrity of the parts while meeting the processing requirements.

[0022] Using a contour abrasive flow fixture, the inner wall of the valve body can be finished, reducing the surface roughness to Ra0.8~1.6, and obtaining a valve body inner wall with better smoothness. Attached Figure Description

[0023] Figure 1 This is an overall drawing of the contour abrasive flow fixture of the present invention.

[0024] Figure 2 This is a schematic diagram of the upper pressure cap of the present invention.

[0025] Figure 3 This is a schematic diagram of the support ring structure of the present invention.

[0026] Figure 4 This is a schematic diagram of the bottom cover plate of the present invention.

[0027] Figure 5 This is a schematic diagram of the bottom cover plate of the present invention.

[0028] Figure 6 This is a schematic diagram of the large-end core mold of the present invention.

[0029] Figure 7 This is a schematic diagram of the small-end core mold of the present invention.

[0030] Figure 8 This is a schematic diagram of the bottom core mold of the present invention.

[0031] Figure 9 This is a schematic diagram of the L-shaped column of the present invention.

[0032] Figure 10 This is a schematic diagram of the side panel of the present invention.

[0033] In the diagram: 7 is the large upper pressure cap, 10 is the support ring, 12 is the bottom large cover plate, 11 is the bottom small cover plate, 9 is the large end core mold, 4 is the small end core mold, 6 is the bottom core mold, 1 is the L-shaped column, and 3 is the side plate. Detailed Implementation

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0035] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0036] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0037] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0038] like Figure 1 As shown.

[0039] A contour abrasive flow fixture for finishing the inner cavity of a three-way valve mainly consists of a large upper pressure cover 7, a support ring 10, a large bottom cover plate 12, a small bottom cover plate 11, a large end core mold 9, a small end core mold 4, a bottom core mold 6, an L-shaped column 1, and a side plate 3. The upper pressure cover 7 is annular, and its end face is in close contact with the upper abrasive cylinder of the abrasive flow mill for abrasive feeding and discharging. The upper pressure cover 7 has stepped protrusions for positioning with the support ring 10. The support ring 10 is cylindrical, and its diameter is equal to the diameter of the protrusions of the upper pressure cover 7 and the bottom large cover plate 12, ensuring a tight fit to prevent abrasive overflow. The bottom large cover plate 12 is disc-shaped, with protrusions that engage with the support ring 10. A circular groove is formed in the center for placing the bottom small cover plate 11, and several threaded holes are formed within the groove for fixing the bottom small cover plate 11. The bottom small cover plate 11 is disc-shaped, with an outer circular hole for connecting to the bottom large cover plate 12 and an inner circular hole for connecting to the bottom core mold 6. It also has four circumferential slots for abrasive flow. The large end core mold 9 is a contour structure of the inner wall of the valve body. Its end face has a round hole for connecting the side plate 3. The far end of the large end core mold 9 is a cylindrical combination reduction structure to prevent interference with the bottom core mold 6. The small end core mold 4 is a contour structure of the inner wall of the valve body. Its end face has a round hole for connecting the side plate. The bottom core mold 6 is a partial contour structure of the inner wall of the valve body. Its end face has a round hole for connecting the bottom small cover plate (11). The L-shaped column (1) cooperates with the bottom large cover plate 12 and the large upper pressure cover 7 to clamp the side plate 3 and fix the valve body. The side plate 3 has a round hole 2 (8) for fixing the large end core mold 9 and the small end core mold 4, and has a fan-shaped hole for abrasive flow. The side plate 3 and the L-shaped column 1 are tightly fitted to fix the valve body.

[0040] like Figure 2 As shown, the large upper pressure cover 7 is annular, and its end face is in close contact with the upper abrasive cylinder of the abrasive flow machine tool. It has stepped protrusions for positioning with the support ring 10.

[0041] like Figure 3As shown, the support ring 10 is cylindrical, and the diameter of the support ring 10 is equal to the diameter of the protrusion of the upper pressure plate 7 and the bottom large cover plate 12. The three fit together tightly to prevent abrasive from overflowing.

[0042] like Figure 4 As shown, the bottom large cover plate 12 is disc-shaped, with a protrusion that mates with the support ring 10. A circular groove is opened in the middle for placing the bottom small cover plate 11, and the groove has several threaded holes for connecting the bottom small cover plate. The bottom large cover plate 12 also has four L-shaped grooves for mates with L-shaped posts.

[0043] like Figure 5 As shown, the bottom small cover plate 11 is disc-shaped, with several round holes on the outer ring for connecting with the bottom large cover plate 12, and several round holes on the inner ring for connecting with the bottom core mold 6. The bottom small cover plate 11 also has four fan-shaped holes for the flow of abrasive.

[0044] like Figure 6 As shown, the large end core mold 9 is a contour structure of the inner wall of the valve body. Its end face has four round holes for threaded connection with the side plate 3. In order to prevent interference with the bottom core mold 6, the far end structure of the large end core mold 9 is a cylindrical combination reduction.

[0045] like Figure 7 As shown, the small end core mold 4 is a contour structure of the inner wall of the valve body, and its end face has a threaded hole for connecting the side plate.

[0046] like Figure 8 As shown, the bottom core mold 6 is a partial contour structure of the inner wall of the valve body, and its end face has a threaded hole for connecting the bottom small cover plate 11.

[0047] like Figure 9 As shown, one end of the L-shaped column 1 is embedded in the L-shaped groove of the bottom large cover plate 12, and the other end is pressed by the large upper pressure cover 7. There are four L-shaped columns in total, which are tightly fitted with the side plate 3 to achieve the positioning of the valve body 5.

[0048] like Figure 10 As shown, the side plate 3 has a round hole 2 (8) for fixing the large and small end core molds 9 and 4. The side plate 3 also has a fan-shaped hole 13 for abrasive flow. The side plate 3 is tightly fitted with the L-shaped column 1 to fix the valve body.

[0049] The large-end core mold 9, small-end core mold 4, and bottom core mold 6 are made of 3D printing resin. The valve body is cast and made of carbon steel.

[0050] The bottom cover plate 12 is made of 45 steel and has four L-shaped slots for installing L-shaped columns 1.

[0051] The bottom large cover plate 12 has multiple threaded holes for connecting the bottom small cover plate 11.

[0052] The distance from the center of the circumferential hole of the side plate 3 to the bottom surface is equal to the distance from the center of the valve port (large end, small end) to the bottom cover plate 12.

[0053] Details are as follows:

[0054] like Figure 1 As shown, the part being machined is a DN100 cast three-way valve, made of carbon steel. The part is a complex cavity valve body with a three-way hole, used for pipeline connection. Due to the complex shape of the valve body cavity and the uneven casting surface quality, it is difficult to ensure the workpiece's shape accuracy and surface quality consistency. Ultimately, abrasive flow machining is required, with a surface roughness requirement of Ra0.8~1.6.

[0055] The three-way valve contour abrasive flow fixture consists of a large upper pressure cover 7, a support ring 10, a large bottom cover plate 12, a small bottom cover plate 11, a large end core mold 9, a small end core mold 4, a bottom core mold 6, an L-shaped column 1, and a side plate 3.

[0056] like Figure 1 As shown, the method of using the fixture of the present invention is as follows:

[0057] 1) First, connect the bottom core mold 6 and the bottom small cover plate 11 with several bolts, then connect the bottom small cover plate 11 and the bottom large cover plate 12 with bolts, and place the bottom large cover plate 12 on the lower abrasive cylinder of the abrasive flow machine tool.

[0058] 2) Adjust the relative position of the valve body 5 and the bottom core mold 6 to make them fit correctly. Place the valve body 5 on the bottom large cover plate 12. Connect the large end core mold 9 and the small end core mold 4 to the side plate 3 with bolts and put them into the valve body cavity. Place the bottom of the side plate 3 on the bottom large cover plate 12. Embed the four L-shaped pillars 1 into the L-shaped slots of the bottom large cover plate 12 so that the L-shaped pillars 1 and the side plate 3 are in close contact to ensure the valve body is positioned.

[0059] 3) Place the support ring 10 on the bottom large cover plate 12, and place the large upper pressure plate 7 on the support ring 10 and the L-shaped column 1.

[0060] 4) After the contour abrasive flow jig is assembled, the abrasive flow machine extrudes the abrasive from the lower abrasive cylinder. The abrasive enters the valve body cavity directly through the four fan-shaped holes of the bottom large cover plate 12. Under the guidance of the mandrel, it flows out through the fan-shaped holes of the side plates installed at both ends and enters the support ring 10. Then, it passes through the large upper pressure cover 7 and enters the upper abrasive cylinder. Similarly, during the machine's downward stroke, the abrasive is extruded from the upper abrasive cylinder into the support ring and then enters the valve body cavity through the fan-shaped holes at both ends. After passing through the bottom of the valve body, it enters the lower abrasive cylinder. This process is repeated multiple times until the inner wall of the valve body is polished to the required technical standard.

[0061] Finally, it should be noted that the above specific 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 examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

[0062] The parts not covered in this invention are the same as or can be implemented using existing technologies.

Claims

1. A contour abrasive flow fixture for finishing the inner hole of a three-way valve, characterized in that: It includes a large upper pressure cap (7), a support ring (10), a bottom large cover plate (12), a bottom small cover plate (11), a large end core mold (9), a small end core mold (4), a bottom core mold (6), an L-shaped column (1), and a side plate (3). The large upper pressure cap (7) is annular, and its end face is in close contact with the upper abrasive cylinder of the abrasive flow machine tool for the entry and exit of abrasive. The large upper pressure cap (7) has stepped protrusions for positioning with the support ring (10). The support ring (10) is cylindrical. The diameter of the large upper cover (7) and the bottom large cover plate (12) protrusions are equal to the diameter of the large upper cover (7) and the bottom large cover plate (12), and they fit tightly to prevent abrasive overflow; the bottom large cover plate (12) is disc-shaped, and the protrusion fits with the support ring (10). A circular groove is opened in the middle for placing the bottom small cover plate (11). Several threaded holes are opened in the groove for fixing the bottom small cover plate (11); the bottom small cover plate (11) is disc-shaped, with an outer circular hole for connecting the bottom large cover plate (12) and an inner circular hole for connecting the bottom core mold (6), and the opening There are four circumferential grooves for abrasive flow; the large end core mold (9) is a contour structure of the inner wall of the valve body, and its end face has a round hole for connecting the side plate (3). The far end of the large end core mold (9) is a cylindrical combined reduction structure to prevent interference with the bottom core mold (6); the small end core mold (4) is a contour structure of the inner wall of the valve body, and its end face has a round hole for connecting the side plate (3); the bottom core mold (6) is a partial contour structure of the inner wall of the valve body, and its end face has a round hole for connecting the bottom small cover plate (11). The L-shaped column (1) cooperates with the bottom large cover plate (12) and the large upper pressure cover (7) to clamp the side plate (3) and thus fix the valve body; the side plate (3) has round holes (2, 8) for fixing the large end core mold (9) and the small end core mold (4), and has fan-shaped holes for abrasive flow. The side plate (3) and the L-shaped column (1) are tightly fitted to fix the valve body; the bottom large cover plate (12) is made of 45# steel and has 4 L-shaped slots for installing the L-shaped column (1).

2. The contour abrasive flow fixture according to claim 1, characterized in that... The large end core mold (9), small end core mold (4), and bottom core mold (6) are made of 3D printing resin; the valve body is cast and made of carbon steel.

3. The contour abrasive flow fixture according to claim 1, characterized in that... The bottom large cover plate (12) has multiple threaded holes for connecting the bottom small cover plate (11).

4. The contour abrasive flow fixture according to claim 1, characterized in that... The distance from the center of the circumferential hole of the side plate (3) to the bottom surface is equal to the distance from the center of the valve port to the bottom cover plate (12).

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