Auxiliary positioning clamp for milling exhaust manifold

Abstract

According to the auxiliary positioning clamp for milling the exhaust manifold, an inclined positioning supporting device is arranged on the right side of the upper end face of a bottom plate, and when the inclined positioning supporting device is connected with a flange at the lower end of a middle pipe of the exhaust manifold in a matched mode, an upper end pipe of the exhaust manifold is in a horizontal state, and a pipe opening in the elbow end of the upper end of the exhaust manifold is parallel to the corresponding side wall face of the bottom plate; the left side of the upper end face of the bottom plate is provided with a positioning and supporting assembly used for supporting the elbow end of the upper end of the exhaust manifold and determining the center position of a pipe opening, and the positioning and supporting assembly is matched with a pressing assembly arranged on the upper end face of the bottom plate to fixedly support the elbow end of the upper end of the exhaust manifold on the bottom plate. Initial positioning conditions are provided for the center of a pipe opening of the upper end pipe of the exhaust manifold, reliable supporting and fixing of the exhaust manifold on the bottom plate are achieved, the defect that a traditional clamp is high in requirement for machining equipment is overcome, machining cost is reduced, the exhaust manifold can be accurately and rapidly positioned and clamped, production cost is reduced, and the machining efficiency is improved. Equipment limitation is eliminated, and the production requirements of parts are met.

Description

Technical Field

[0001] This utility model belongs to the field of exhaust manifold processing technology, specifically relating to an auxiliary positioning fixture for exhaust manifold milling. Background Technology

[0002] In the turbocharger structure of an internal combustion engine, when the engine is running, the exhaust manifold is subjected to high-temperature and high-pressure exhaust gases. Due to the space limitations of the turbocharger, such as... Figures 5-7 As shown, the exhaust manifold has an irregular shape, and the pipe opening is designed as a three-dimensional spatial structure to ensure connection with other piping systems. The design drawings of the exhaust manifold generally specify the distances L1, L2, and L3 between the center of the upper pipe opening and the center of the bottom end face of the lower flange in three directions, and the angles a1, a2, and a3 between the central axis of the pipe opening and the center of the bottom end face of the flange in three directions. The above-mentioned distance and angle requirements for the pipe opening are very high, making the machining very difficult. Specially designed milling jigs must be used for positioning during machining.

[0003] The existing processing method is as follows: The existing milling fixture positioning structure is mainly composed of a base plate, positioning pins, keys, screws, diamond pins, washers, screws, and cylinders. The base plate is positioned and installed on the machine tool worktable by positioning pins and keys. The bottom end face of the exhaust manifold flange is connected to the end face of the fixture. The diamond pins and cylinder pins are positioned with the holes on the bottom end face of the exhaust manifold. Washers and screws are installed to press the exhaust manifold. Since the upper end of the exhaust manifold has angle and distance limitations in different directions, the machine tool needs to establish the workpiece coordinate system according to the center of the bottom end face of the flange and then move the X-axis, Y-axis, and Z-axis by the corresponding distances according to the drawings. The machine tool spindle milling head then moves the workpiece by the corresponding distances according to the three angles in the drawings. The fitted angle is used to rotate the C-axis and B-axis to the corresponding angle, thereby machining the end face, outer circle, and conical surface of the pipe opening. As can be seen from the above machining process, using existing milling fixtures places higher demands on the machining equipment. Equipment with five-axis milling capabilities is required to complete the machining. The spindle milling head in the equipment must have C-axis and B-axis rotation capabilities, or the worktable must have A-axis or C-axis rotation capabilities. Furthermore, due to the limitations of the part's dimensions, the dimensions of the machining equipment must meet the part's machining requirements. This results in high machining costs and significant equipment limitations, failing to meet the production needs of the parts. Therefore, improvements are necessary to address these issues. Utility Model Content

[0004] The technical problem solved by this utility model is to provide an auxiliary positioning fixture for milling exhaust manifolds. By setting an inclined positioning support device on the base plate, the elbow end of the exhaust manifold, with its upper end pipe in a horizontal state, is parallel to the corresponding side wall of the base plate and positioned on the base plate, providing initial positioning conditions for the center of the upper end pipe of the exhaust manifold. By setting a positioning support component and a clamping component on the base plate for supporting and clamping the upper end pipe of the exhaust manifold, reliable support and fixation of the exhaust manifold on the base plate is achieved. This solves the drawback of traditional fixtures that require high processing equipment, reduces processing costs, and can accurately and quickly position and clamp the exhaust manifold, reducing production costs, eliminating equipment limitations, and meeting the production needs of parts.

[0005] The technical solution adopted by this utility model is: an auxiliary positioning fixture for milling exhaust manifolds, including a base plate. The upper right side of the base plate is provided with an inclined positioning support device that is adapted to the flange at the lower end of the exhaust manifold, so that the upper end of the exhaust manifold is in a horizontal state and the pipe opening of the upper elbow end of the exhaust manifold is parallel to the corresponding side wall of the base plate. The upper left side of the base plate is provided with a positioning support component for supporting the upper elbow end of the exhaust manifold and determining the center position of the pipe opening. The positioning support component, together with the clamping component provided on the upper surface of the base plate, fixes and supports the upper elbow end of the exhaust manifold on the base plate.

[0006] The inclined positioning support device includes an inclined block, which is a columnar structure with a flat lower end and an inclined upper end. The lower end of the inclined block is fixed to the right side of the upper upper end of the base plate, and a positioning plate for positioning the flange at the lower end of the exhaust manifold is fixed on the inclined block. The flange is centered and fixed on the positioning plate, and the upper end of the exhaust manifold is kept horizontal under the support of the inclined block.

[0007] Furthermore, the positioning plate is symmetrically provided with diamond-shaped pins and cylindrical pins fixed on the wedge block, and the corresponding holes on the bottom surface of the flange on the positioning plate are respectively adapted to the diamond-shaped pins and cylindrical pins to realize anti-rotation positioning and center positioning of the flange.

[0008] Furthermore, the positioning plate is detachably fixed to the inclined block by a plurality of screws on the circumferential portion.

[0009] Furthermore, the positioning support assembly includes a V-block, a support rod, and a positioning bushing. The upper surface of the base plate is threaded with four upper guide heads that are respectively adapted to the guide grooves at the four corners of the bottom surface of the V-block. The elbow end of the upper end of the exhaust manifold is adapted to the V-groove on the upper surface of the V-block. A fastening nut is threaded to the lower end of the support rod. The upper end of the exhaust manifold is kept horizontal by adjusting the height of the support rod. A positioning bushing is fixed on the front side wall of the base plate. When the center of the pipe opening of the horizontal exhaust manifold and the center of the positioning bushing are on the same straight line under the support of the inclined positioning support device, the upper end of the exhaust manifold is pressed and fixed by the clamping assembly.

[0010] Furthermore, the clamping assembly includes a support column, a connecting column, and a pressure plate. The support column and the connecting column are both located outside the positioning support assembly, and their lower ends are fixed to the base plate. The upper end of the support column is threadedly connected to a second support rod, and the second support rod, when its height is adjusted, is threadedly connected to its lower end and locked against a locking nut at the upper end of the support column. The guide head at the upper end of the second support rod is adapted to the guide groove on the bottom surface of the left end of the pressure plate. The screw fixed at the upper end of the connecting column passes through the waist-shaped elongated hole in the middle of the pressure plate and is adapted to connect with the connecting nut. By adjusting the connecting nut, the other end of the pressure plate presses and fixes the upper end of the exhaust manifold onto the positioning support assembly.

[0011] Furthermore, positioning components are fixed at the two corner positions on the front side of the upper end of the base plate, and the front edge of the positioning component is parallel to the X-axis of the machine tool, which is the installation direction of the fixture on the machine tool worktable.

[0012] Furthermore, lifting screws for lifting the entire fixture are fixed at the four corners of the upper surface of the base plate.

[0013] Advantages of this utility model compared to the prior art:

[0014] 1. This technical solution provides initial positioning conditions for the center of the exhaust manifold's upper pipe opening by setting an inclined positioning support device on the base plate, so that the elbow end of the exhaust manifold, which is in a horizontal state, is parallel to the corresponding side wall of the base plate and positioned on the base plate.

[0015] 2. This technical solution achieves reliable support and fixation of the exhaust manifold on the base plate by setting a positioning support component and a clamping component for supporting and clamping the upper end pipe of the exhaust manifold. This solves the drawback of traditional fixtures that require high processing equipment, reduces processing costs, and can accurately and quickly position and clamp the exhaust manifold, thereby reducing production costs and eliminating equipment limitations.

[0016] 3. This technical solution has a simple structure, novel design, convenient disassembly, simple and reliable positioning, and reasonable positioning structure, which reduces the difficulty of processing. By controlling the corresponding elements through the fixture, the three-dimensional spatial pipe opening position and size of the processed exhaust manifold can be guaranteed to be qualified, thereby improving processing accuracy and efficiency, meeting the production needs of parts, and having a wide range of applications. Attached Figure Description

[0017] Figure 1 This is a front view of the structure of this utility model when connected to an exhaust manifold;

[0018] Figure 2 This is a top view of the structure of this utility model when connected to an exhaust manifold;

[0019] Figure 3 for Figure 1 Diagram of direction B in the middle;

[0020] Figure 4 for Figure 2 Sectional view of AA;

[0021] Figure 5 This is a front view of the exhaust manifold;

[0022] Figure 6 This is a top view of the exhaust manifold;

[0023] Figure 7 This is a left view of the exhaust manifold. Detailed Implementation

[0024] The following will be based on the embodiments of this utility model. Figures 1-4 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] It should be noted that, unless otherwise stated herein, the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] An auxiliary positioning fixture for milling an exhaust manifold includes a base plate 9. The upper right side of the base plate 9 has an inclined positioning support device that, when connected to the flange 10-1 at the lower end of the exhaust manifold 10, ensures the upper end of the exhaust manifold 10 is horizontal and the elbow end of the exhaust manifold 10 is parallel to the corresponding side wall of the base plate 9. The upper left side of the base plate 9 has a positioning support assembly for supporting the elbow end of the exhaust manifold 10 and determining the center position of the pipe opening. The positioning support assembly, in conjunction with a clamping assembly located on the upper surface of the base plate 9, fixes the elbow end of the exhaust manifold 10 onto the base plate 9. In this structure, by… An inclined positioning support device is provided on the base plate 9 so that the upper elbow end of the exhaust manifold 10, with its upper end pipe in a horizontal state, is parallel to the corresponding side wall of the base plate 9 and positioned on the base plate 9, providing initial positioning conditions for the center of the upper end pipe of the exhaust manifold 10. By setting a positioning support assembly and a clamping assembly on the base plate 9 for supporting and clamping the upper end pipe of the exhaust manifold 10, reliable support and fixation of the exhaust manifold 10 on the base plate 9 is achieved, solving the drawback of traditional fixtures that require high processing equipment, reducing processing costs, and enabling precise and quick positioning and clamping of the exhaust manifold, reducing production costs and eliminating equipment limitations.

[0028] The specific structure of the inclined positioning support device is as follows: The inclined positioning support device includes an inclined block 11, which is a columnar structure with a flat lower end and an inclined upper end. The lower end of the inclined block 11 is fixed to the right side of the upper end of the base plate 9, and the positioning plate 12 used to position the flange 10-1 at the lower end of the middle pipe of the exhaust manifold 10 is fixed on the inclined block 11. The flange 10-1 is centered and fixed on the positioning plate 12, and the upper end of the exhaust manifold 10 is in a horizontal state under the support of the inclined block 11.

[0029] The positioning structure of the positioning plate 12 for the flange 10-1 is as follows: The positioning plate 12 is symmetrically provided with diamond-shaped pins 13 and cylindrical pins 14 fixed on the wedge block 11. Corresponding holes on the bottom surface of the flange 10-1 on the positioning plate 12 are respectively adapted to the diamond-shaped pins 13 and cylindrical pins 14, achieving anti-rotation positioning and center positioning of the flange 10-1. The diamond-shaped pins 13 and cylindrical pins 14 are used to position the center of the bottom end face of the flange 10-1 of the exhaust manifold 10 and restrict the rotation of the exhaust manifold 10, thereby providing conditions for positioning the pipe opening direction of the upper end pipe of the exhaust manifold 10. Specifically, the positioning plate 12 is detachably fixed to the inclined block 11 by multiple screws 15 on its circumferential portion.

[0030] The specific structure of the positioning support assembly is as follows: The positioning support assembly includes a V-block 16, a support rod 17, and a positioning bushing 8. The upper end face of the base plate 9 is threaded with two guide heads at their upper ends, which are respectively adapted to the guide grooves at the four corners of the bottom surface of the V-block 16. The guide grooves are U-shaped guide grooves with a T-shaped cross-section located at the four corners of the bottom surface of the V-block 16, ensuring that the guide heads at the upper ends of the support rods 17 fit within the U-shaped guide grooves without detaching from the V-block 16. They can also be moved and adjusted along the guide grooves. Furthermore, the elbow end of the upper pipe of the exhaust manifold 10 is adapted to the upper end of the V-block 16. The V-groove on the surface serves as an auxiliary support for the exhaust manifold 10. The lower end of the support rod 17 is threaded with a fastening nut. By adjusting the height of the support rod 17, the upper end of the exhaust manifold 10 is kept in a horizontal state. A positioning bushing 8 is fixed on the front side wall of the base plate 9. When the center of the pipe opening of the horizontal exhaust manifold 10 is aligned with the center of the positioning bushing 8 under the support of the inclined positioning support device, the upper end of the exhaust manifold 10 is pressed and fixed by the clamping assembly. The bushing 8 is used to determine the initial position of the center of the pipe opening of the upper end of the exhaust manifold 10.

[0031] The specific structure of the clamping assembly is as follows: The clamping assembly includes a support column 7, a connecting column 6, and a pressure plate 5. The support column 7 and the connecting column 6 are both located outside the positioning support assembly, and their lower ends are fixed to the base plate 9. The upper end of the support column 7 is threadedly connected to a support rod 4, and the support rod 4, when its height is adjusted to the correct position, is threadedly connected to its lower end and locked against a locking nut at the upper end of the support column 7. The guide head at the upper end of the support rod 4 is adapted to the guide groove on the bottom left side of the pressure plate 5. The upper end of the connecting column 6 is fixed. The screw passes through the waist-shaped elongated hole in the middle of the pressure plate 5 and is adapted to the connecting nut 3. By adjusting the connecting nut 3, the other end of the pressure plate 5 presses and fixes the upper end of the exhaust manifold 10 onto the positioning support assembly. Under the premise that the guide head at the upper end of the support rod 4 is adapted to the guide groove on the bottom surface of the left end of the pressure plate 5, the upper end of the connecting column 6 passes through the waist-shaped elongated hole in the middle of the pressure plate 5, thereby providing the pressure plate 5 with an adjustable support condition. This ensures that the right end of the pressure plate 5 abuts against the upper end of the exhaust manifold 10 to reliably press and fix the exhaust manifold 10.

[0032] In order to quickly determine the installation direction of the fixture on the machine tool, positioning parts 2 are fixed at the two corner positions on the front side of the upper end of the base plate 9. When the front side edge of the positioning part 2 is parallel to the X-axis of the machine tool, it is the installation direction of the fixture on the machine tool worktable.

[0033] To ensure a stable and reliable lifting clamp, lifting screws 1 are fixed at the four corners of the upper surface of the base plate 9 for lifting the entire clamp.

[0034] The inclined block 11 is positioned on the base plate 9 using a two-pin method and is fixed to the base plate 9 with screws; the positioning plate 12 is positioned on the inclined block 11 using a two-pin method and is pressed with screw 15. The positioning plate 15 is used to position the bottom end face of the flange of the exhaust manifold 10; the diamond pin 13 and the cylindrical pin 14 are fixed on the inclined block 11 to position the center of the bottom end face of the flange of the exhaust manifold 10 and restrict its rotation; bolts and gaskets fix the flange 10-1 at the lower end of the exhaust manifold 10 to the inclined block 11 and the positioning plate 12; the support rod 17 is threaded to the base plate 9 and tightened with a lock nut 1. It is used to adjust the upper and lower positions of the V-block 16 so that the V-groove surface of the upper end face of the V-block 16 contacts the outer circular surface of the upper end pipe of the exhaust manifold 10, which plays an auxiliary support role. The upper end of the manifold 10 protrudes beyond the clamping part. The purpose of the V-block 16 is to reduce vibration during the machining of the exhaust manifold 10 opening. The connecting column 6 is fixed to the base plate 9, and the screw at the upper end of the connecting column 6 is fastened with the connecting nut 3. The support column 7 is fixed to the base plate 9, and the support rod 4 is threaded to the upper end of the support column 7 and fastened with the lock nut, which serves to support the pressure plate 5. The screw at the upper end of the connecting column 6 passes through the waist-shaped hole in the middle of the pressure plate 5. The washer and the connecting nut 3 are connected to the screw at the upper end of the connecting column 6, which helps to press the exhaust manifold 10 against the pressure plate 5. The positioning part 2 is positioned on the base plate 9 by means of one side and two pins and is tightened with screws. The function of the positioning part 2 is to determine the tooling direction. The positioning bushing 8 is used to determine the initial position of the center of the upper end of the exhaust manifold 10 opening.

[0035] During operation, the bottom surface of the base plate 9 is placed flat on the machine tool's worktable. T-bolts are used to press the fixture onto the worktable. Before pressing, the front side plates of the two positioning parts 2 are aligned parallel to the X-axis of the machine tool. This is how the fixture is installed on the machine tool's worktable.

[0036] After installing the fixture on the machine tool workbench, install the exhaust manifold 10 into the fixture. The bottom end face of the flange 10-1 of the exhaust manifold 10 is close to the positioning plate 12. The two positioning holes in the bottom end face of the flange 10-1 are positioned with the diamond pin 13 and the cylindrical pin 14 respectively. Install the gasket and bolts, tighten the bolts, and press and fix the flange 10-1 of the exhaust manifold 10 onto the fixture.

[0037] After fixing the bottom end face of flange 10-1 of exhaust manifold 10 to the clamp, adjust support rod 17 so that the V-groove surface at the upper end of V-block 16 contacts the outer circular surface of the elbow end of the upper pipe of exhaust manifold 10, and tighten the locking nut; install pressure plate 5, loosen the locking nut, adjust the height of support rod 4 so that pressure plate 5 is horizontal and in contact with the upper pipe of exhaust manifold 10, and tighten the locking nut; install washers and connecting nuts 3 sequentially on the screw at the upper end of connecting column 6, and... Tighten the connecting nut 3 to press the pressure plate 5 against the outer circle of the auxiliary support at the pipe opening of the upper end of the exhaust manifold 10. Determine the initial position of the exhaust manifold pipe opening center in the fixture according to the center of the positioning bushing 8. Then, move the machine tool spindle by a distance h4 in the Y direction and a distance h5 in the Z direction to the side of the positioning part 2 according to the initial position of the pipe opening center in the fixture. After the theoretical center position of the pipe opening is determined, machine the end face, outer circle, and conical surface of the pipe opening of the upper end of the exhaust manifold 10 according to the requirements in the drawing.

[0038] Control elements of the fixture: To ensure the positional accuracy of the exhaust manifold inlet being machined, it is necessary to control the angle b1 between the upper plane of the positioning plate 12 and the bottom plane of the base plate 8, the collinearity of the center of the rhomboid pin 13 and the center of the cylindrical pin 14 with the two reference holes in the positioning plate 12. Center and Angle b2 where the centers of the holes are collinear, and the two reference holes in the positioning plate 12. Center and The angle b3 between the collinear centers and the collinear front sides of the two positioning components 2; it is also necessary to control the distance h1 between the center of the positioning plate 12 and the center of the positioning bushing 8, the distance h2 between the center of the positioning plate 12 and the front side of the positioning component 2, and the distance h3 between the center of the positioning bushing 8 and the center of the positioning plate 12.

[0039] The values ​​of h1, h2, h3, h4, h5 and angles b1, b2, b3 in the fixture are obtained by creating a part model using 3D solid modeling software and measuring the theoretical values ​​by rotating the bottom end face of the flange 10-1 of the exhaust manifold 10 around the center of the exhaust manifold 10 inlet. By controlling these values ​​in the fixture, the distances L1, L2, L3 from the center of the exhaust manifold 10 inlet to the center of the bottom end face of the flange 10-1 of the exhaust manifold 10, as well as the angles a1, a2, a3, are guaranteed.

[0040] This technical solution features a simple structure, novel design, convenient disassembly, simple and reliable positioning, and a reasonable positioning structure, which reduces the difficulty of processing. By controlling the corresponding elements through the fixture, the three-dimensional spatial position and size of the exhaust manifold can be guaranteed to be qualified, thereby improving processing accuracy and efficiency, meeting the production needs of parts, and having a wide range of applications.

[0041] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An auxiliary positioning fixture for milling exhaust manifolds, characterized in that: The base plate (9) is provided with a slanted positioning support device on the right side of the upper end face of the base plate (9) that is adapted to the flange (10-1) at the lower end of the middle pipe of the exhaust manifold (10) so that the upper end pipe of the exhaust manifold (10) is in a horizontal state and the pipe opening of the upper elbow end of the exhaust manifold (10) is parallel to the corresponding side wall of the base plate (9). The left side of the upper end face of the base plate (9) is provided with a positioning support component for supporting the upper elbow end of the exhaust manifold (10) and determining the center position of the pipe opening. The positioning support component, together with the clamping component provided on the upper end face of the base plate (9), fixes the upper elbow end of the exhaust manifold (10) on the base plate (9).

2. The auxiliary positioning fixture for milling exhaust manifolds according to claim 1, characterized in that: The inclined positioning support device includes an inclined block (11), which is a columnar structure with a flat lower end and an inclined upper end. The lower end of the inclined block (11) is fixed to the right side of the upper end of the base plate (9), and the positioning plate (12) used to position the flange (10-1) at the lower end of the middle pipe of the exhaust manifold (10) is fixed on the inclined block (11). The flange (10-1) is centered and fixed on the positioning plate (12), and the upper end of the exhaust manifold (10) is in a horizontal state under the support of the inclined block (11).

3. The auxiliary positioning fixture for milling exhaust manifolds according to claim 2, characterized in that: The positioning plate (12) is symmetrically provided with a diamond pin (13) and a cylindrical pin (14) fixed on the wedge (11), and the corresponding holes on the bottom surface of the flange (10-1) on the positioning plate (12) are respectively adapted to the diamond pin (13) and the cylindrical pin (14) to realize the anti-rotation positioning and center positioning of the flange (10-1).

4. The auxiliary positioning fixture for milling exhaust manifolds according to claim 3, characterized in that: The positioning plate (12) is detachably fixed to the inclined block (11) by a plurality of screws (15) on the circumferential portion.

5. The auxiliary positioning fixture for milling exhaust manifolds according to claim 1, characterized in that: The positioning support assembly includes a V-block (16), a support rod (17), and a positioning bushing (8). The upper end of the base plate (9) is threaded with four upper guide heads that are adapted to the guide grooves at the four corners of the bottom surface of the V-block (16). The upper elbow of the exhaust manifold (10) is adapted to the V-groove on the upper end of the V-block (16). The lower end of the support rod (17) is threaded with a fastening nut. The upper end of the exhaust manifold (10) is kept horizontal by adjusting the height of the support rod (17). The positioning bushing (8) is fixed on the front side wall of the base plate (9). When the center of the pipe opening of the horizontal exhaust manifold (10) is aligned with the center of the positioning bushing (8) under the support of the inclined positioning support device, the upper end of the exhaust manifold (10) is pressed and fixed by the clamping assembly.

6. The auxiliary positioning fixture for milling exhaust manifolds according to claim 5, characterized in that: The clamping assembly includes a support column (7), a connecting column (6), and a pressure plate (5). The support column (7) and the connecting column (6) are both located outside the positioning support assembly, and the lower ends of the support column (7) and the connecting column (6) are fixed on the base plate (9). The upper end of the support column (7) is threaded with a support rod (4), and the support rod (4) with its height adjusted is locked by threading to the lower end and abutting against the locking nut at the upper end of the support column (7). The guide head at the upper end of the support rod (4) is adapted to the guide groove on the bottom surface of the left end of the pressure plate (5). The screw fixed at the upper end of the connecting column (6) passes through the waist-shaped long hole in the middle of the pressure plate (5) and is adapted to the connecting nut (3). By adjusting the connecting nut (3), the other end of the pressure plate (5) presses and fixes the upper end of the exhaust manifold (10) onto the positioning support assembly.

7. The auxiliary positioning fixture for milling exhaust manifolds according to any one of claims 1-6, characterized in that: Positioning components (2) are fixed at the two corner positions on the front side of the upper end of the base plate (9), and the front edge of the positioning component (2) is parallel to the X-axis of the machine tool, which is the installation direction of the fixture on the machine tool worktable.

8. The auxiliary positioning fixture for milling exhaust manifolds according to claim 7, characterized in that: The base plate (9) has lifting screws (1) fixed at the four corners of its upper surface for lifting the entire fixture.

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