Fixture for milling exhaust manifold

Abstract

An inclined positioning and supporting device is arranged on the right side of the upper end face of a bottom plate, and when the inclined positioning and supporting device is connected with a flange at the lower end of a middle pipe of the exhaust manifold in a matched mode, the 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 the 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, the machining cost is reduced, the exhaust manifold can be accurately and rapidly positioned and clamped, the production cost is reduced, equipment limitation is eliminated, and the machining efficiency is improved. And the production requirements of parts are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of exhaust manifold processing, and particularly relates to a fixture for milling processing of an exhaust manifold. Background Art

[0002] In the turbocharger structure of an internal combustion engine, when the engine is working, the exhaust manifold bears high-temperature and high-pressure exhaust gas. Limited by the space of the turbocharger, as Figures 5 - 7 shown, the shape of the exhaust manifold is irregular, and the pipe orifices in the manifold are designed as three-dimensional space structures to ensure connection with other pipe systems. In the design drawings of the exhaust manifold, the distances L1, L2, and L3 in three directions between the center of the upper pipe orifice and the center of the bottom end face of the lower flange are generally specified, and the angles a1, a2, and a3 between the center axis of the pipe orifice and the center of the bottom end face of the flange in three directions. The above distance and angle requirements of the pipe orifice are very high, and the processing difficulty is very great. A special milling fixture designed for it must be used for positioning during processing.

[0003] The existing processing method is as follows: The existing positioning structure of the milling fixture is specifically as follows: It mainly consists of a bottom plate, positioning pins, keys, screws, diamond pins, gaskets, screws, and cylinders. The bottom plate is positioned and installed on the machine tool workbench through the positioning pins and keys. The bottom end face of the exhaust manifold flange is connected to the fixture end face. The diamond pins and cylindrical pins are positioned with the holes on the bottom end face in the exhaust manifold. After installing the gaskets and screws, the exhaust manifold is clamped. Since there are angle and distance limitations for the upper pipe of the exhaust manifold in different directions, therefore, after the machine tool establishes the workpiece coordinate system based on the center of the bottom end face of the flange, it needs to move the X-axis, Y-axis, and Z-axis by corresponding distances according to the drawing. Then, the milling head of the machine tool spindle rotates the C-axis and B-axis to the corresponding angles according to the angles fitted in the three angles in the drawing, and then processes the end face, outer circle, and conical surface milling of the pipe orifice; It can be seen from the above processing process that when using the existing milling fixture for processing, higher requirements must be put forward for the processing equipment. Equipment with five-axis milling function is required to complete the processing. The spindle milling head in the equipment must have the rotation functions of the C-axis and B-axis, or the machine tool workbench must have the rotation function of the A-axis or C-axis. At the same time, limited by the part specification dimensions, the specification dimensions of the processing equipment must meet the part processing requirements. In this way, the processing cost is very high, the equipment limitation is high, and it cannot meet the production requirements of the parts; Therefore, in view of the above problems, it is necessary to make improvements. Summary of the Invention

[0004] Technical problems to be solved by the present invention: Provide a fixture for milling processing of an exhaust manifold. By arranging an inclined positioning support device on the bottom plate, the elbow end pipe orifice of the exhaust manifold with the upper end pipe in a horizontal state is parallel to the corresponding side wall surface of the bottom plate and positioned on the bottom plate, providing an initial positioning condition for the orifice center of the upper end pipe of the exhaust manifold. And by arranging a positioning support assembly and a pressing assembly for supporting and clamping the upper end pipe of the exhaust manifold on the bottom plate, reliable support and fixation of the exhaust manifold on the bottom plate are realized, solving the drawback of high requirements for processing equipment existing in traditional fixtures, reducing the processing cost, being able to accurately and quickly position and clamp the exhaust manifold, reducing the production cost, eliminating equipment limitations, and meeting the production requirements of parts.

[0005] Technical solution adopted by the present invention: A fixture for milling processing of an exhaust manifold, including a bottom plate. On the right side of the upper end surface of the bottom plate, there is an inclined positioning support device that, when adaptively connected to the flange at the lower end of the middle pipe of the exhaust manifold, makes the upper end pipe of the exhaust manifold in a horizontal state and makes the elbow end pipe orifice of the upper end of the exhaust manifold parallel to the corresponding side wall surface of the bottom plate. On the left side of the upper end surface of the bottom plate, there is a positioning support assembly for supporting the elbow end of the upper end of the exhaust manifold and determining the position of the pipe orifice center. And the positioning support assembly cooperates with the pressing assembly arranged on the upper end surface of the bottom plate to fixedly support the elbow end of the upper end of the exhaust manifold on the bottom plate.

[0006] Among them, the inclined positioning support device includes an inclined block. The inclined block has a columnar structure with a flat lower end surface and an inclined upper end surface. The lower end of the inclined block is fixedly positioned on the right side of the upper end surface of the bottom plate, and a positioning plate for positioning the flange at the lower end of the middle pipe of the exhaust manifold is fixed on the inclined block. The center of the flange is positioned and fixed on the positioning plate, and under the support of the inclined block, the upper end pipe of the exhaust manifold is in a horizontal state.

[0007] Furthermore, diamond pins and cylindrical pins fixed on a wedge block are symmetrically arranged on the surface of the positioning plate, and the corresponding holes on the bottom surface of the flange located on the positioning plate are respectively adapted to the diamond pins and the cylindrical pins, realizing anti-rotation positioning and center positioning of the flange.

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

[0009] Further, the positioning and supporting assembly includes a V-block, a first support rod, and a positioning bushing. Four first support rods with guide heads at the upper ends are threadedly connected to the upper end surface of the bottom plate, and the guide heads are respectively and adaptively connected to the guide grooves at the four corners of the bottom surface of the V-block. The elbow end of the upper pipe of the exhaust manifold is adapted to the V-groove on the upper end surface of the V-block. The lower end of the first support rod is threadedly connected with a fastening nut, and the height of the first support rod is adjusted to make the upper pipe of the exhaust manifold in a horizontal state. A positioning bushing is fixed on the front side wall of the bottom plate, and when the center of the pipe orifice of the horizontally placed upper pipe of the exhaust manifold is on the same straight line as the center of the positioning bushing under the support of the inclined positioning and supporting device, the upper pipe of the exhaust manifold is pressed and fixed by the pressing assembly.

[0010] Further, the pressing assembly includes a support column, a connecting column, and a pressing plate. The support column and the connecting column are both located outside the positioning and supporting assembly, and the lower ends of the support column and the connecting column are both fixed on the bottom plate. The upper end of the support column is threadedly connected with a second support rod, and the second support rod with the height adjusted is locked by a locking nut threadedly connected to the lower end and abutted against 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 pressing plate. The screw rod fixed at the upper end of the connecting column passes through the long waist-shaped hole in the middle of the pressing plate and is adaptively connected with a connecting nut, and the other end of the pressing plate presses and fixes the upper pipe of the exhaust manifold on the positioning and supporting assembly by adjusting the connecting nut.

[0011] Further, positioning members are fixed at the edge positions of the front side of the upper end surface of the bottom plate at two corner positions, and when the front side edge of the positioning member is parallel to the X-axis of the machine tool, it is the installation direction of the fixture on the machine tool workbench.

[0012] Further, lifting screws for lifting the whole fixture are fixed at the four corner positions of the upper end surface of the bottom plate.

[0013] Advantages of the present invention compared with the prior art:

[0014] 1. In this technical solution, by arranging an inclined positioning and supporting device on the bottom plate, the elbow end pipe orifice in the exhaust manifold with the upper pipe in a horizontal state is parallel to the corresponding side wall surface of the bottom plate and positioned on the bottom plate, providing an initial positioning condition for the center of the pipe orifice of the upper pipe of the exhaust manifold.

[0015] 2. In this technical solution, by arranging a positioning and supporting assembly and a pressing assembly on the bottom plate for supporting and clamping the upper pipe of the exhaust manifold, reliable support and fixation of the exhaust manifold on the bottom plate are realized, solving the drawback of high requirements for processing equipment in traditional fixtures, reducing the processing cost, being able to accurately and quickly position and clamp the exhaust manifold, reducing the production cost, and eliminating equipment limitations.

[0016] 3. The technical solution has a simple structure, novel design, convenient disassembly, simple and reliable positioning, reasonable positioning structure, reduces the processing difficulty. By controlling the corresponding elements with a fixture, the dimensional accuracy of the three-dimensional space pipe orifice position of the machined exhaust manifold can be ensured, improving the processing accuracy and efficiency, meeting the production requirements of parts, and having a wide application range. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is the main view of the structure when the present invention is connected to the exhaust manifold;

[0018] Figure 2 is the top view of the structure when the present invention is connected to the exhaust manifold;

[0019] Figure 3 is Figure 1 the schematic view in the B direction in

[0020] Figure 4 is Figure 2 the sectional view taken along the line A-A in

[0021] Figure 5 is the main view of the exhaust manifold;

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

[0023] Figure 7 is the left view of the exhaust manifold. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the Figures 1 - 4 in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0025] It should be noted that in this article, without contrary description, it should be understood that: the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

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

[0027] A fixture for milling an exhaust manifold includes a bottom plate 9. On the right side of the upper end surface of the bottom plate 9, there is an inclined positioning and supporting device that, when adaptively connected to the flange 10-1 at the lower end of the middle pipe of the exhaust manifold 10, keeps the upper pipe of the exhaust manifold 10 in a horizontal state and makes the pipe orifice at the elbow end of the upper end of the exhaust manifold 10 parallel to the corresponding side wall surface of the bottom plate 9. On the left side of the upper end surface of the bottom plate 9, there is a positioning and supporting assembly for supporting the elbow end of the upper end of the exhaust manifold 10 and determining the center position of the pipe orifice. And in cooperation with a pressing assembly provided on the upper end surface of the bottom plate 9, the elbow end of the upper end of the exhaust manifold 10 is fixedly supported on the bottom plate 9. In the above structure, by providing an inclined positioning and supporting device on the bottom plate 9, the pipe orifice at the elbow end of the upper end of the exhaust manifold 10 with the upper pipe in a horizontal state is parallel to the corresponding side wall surface of the bottom plate 9 and positioned on the bottom plate 9, providing an initial positioning condition for the center of the pipe orifice of the upper pipe of the exhaust manifold 10. By providing a positioning and supporting assembly and a pressing assembly on the bottom plate 9 for supporting and clamping the upper pipe of the exhaust manifold 10, reliable support and fixation of the exhaust manifold 10 on the bottom plate 9 are achieved, solving the drawback of high requirements for processing equipment in traditional fixtures, reducing processing costs, being able to accurately and quickly position and clamp the exhaust manifold, reducing production costs, and eliminating equipment limitations.

[0028] The specific structure of the inclined positioning and supporting device is as follows: The inclined positioning and supporting device includes an inclined block 11. The inclined block 11 has a columnar structure with a flat lower end surface and an inclined upper end surface. The lower end of the inclined block 11 is fixedly positioned on the right side of the upper end surface of the bottom plate 9, and a positioning plate 12 for positioning 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 center of the flange 10-1 is positioned and fixed on the positioning plate 12, and with the support of the inclined block 11, the upper pipe of the exhaust manifold 10 is in a horizontal state.

[0029] The positioning structure of the positioning plate 12 for the flange 10-1 is as follows: On the surface of the positioning plate 12, diamond pins 13 and cylindrical pins 14 fixed to the wedge blocks 11 are symmetrically arranged. The corresponding holes on the bottom surface of the flange 10-1 located on the positioning plate 12 are respectively adapted to the diamond pins 13 and the cylindrical pins 14, realizing anti-rotation positioning and center positioning of the flange 10-1. The settings of the diamond pins 13 and the 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 orifice direction of the upper pipe of the exhaust manifold 10. Specifically, the positioning plate 12 is detachably fixed to the wedge block 11 by a plurality of screws one 15 in the circumferential part.

[0030] The specific structure of the positioning and supporting assembly is as follows: The positioning and supporting assembly includes a V-shaped block 16, a support rod one 17, and a positioning bushing 8. On the upper end face of the bottom plate 9, two support rods one 17 whose upper end guide heads are respectively adapted to the guide grooves at the four corners of the bottom surface of the V-shaped block 16 are threadedly connected. Among them, the guide grooves are U-shaped guide grooves with a T-shaped cross-section arranged at the four corners of the bottom surface of the V-shaped block 16, so that the guide heads at the upper ends of the support rods one 17 are adapted to the U-shaped guide grooves and will not separate from the V-shaped block 16, and can also be adjusted and positioned along the guide grooves. The elbow end of the upper pipe of the exhaust manifold 10 is adapted to the V-shaped groove on the upper end face of the V-shaped block 16, playing a role in auxiliary support for the exhaust manifold 10. The lower end of the support rod one 17 is threadedly connected with a fastening nut, and the height of the support rod one 17 is adjusted to make the upper pipe of the exhaust manifold 10 in a horizontal state. A positioning bushing 8 is fixed on the front side wall of the bottom plate 9. When the center of the pipe orifice of the horizontal upper pipe of the exhaust manifold 10 and the center of the positioning bushing 8 are on the same straight line under the support of the inclined positioning and supporting device, the upper pipe of the exhaust manifold 10 is pressed and fixed by the pressing assembly. The bushing 8 is used to determine the initial position of the center of the pipe orifice of the upper pipe of the exhaust manifold 10.

[0031] The specific structure of the pressing assembly is as follows: The pressing assembly includes a support column 7, a connecting column 6, and a pressing plate 5. Both the support column 7 and the connecting column 6 are located outside the positioning and supporting assembly, and the lower ends of the support column 7 and the connecting column 6 are both fixed on the bottom plate 9. A second support rod 4 is threadedly connected to the upper end of the support column 7, and the second support rod 4 with the height adjusted in place is locked by a locking nut that is threadedly connected to the lower end and abuts against the upper end of the support column 7. The guide head at the upper end of the second support rod 4 is fitted into the guide groove on the bottom surface of the left end of the pressing plate 5. The screw rod fixed to the upper end of the connecting column 6 passes through the long waist-shaped hole in the middle of the pressing plate 5 and is fitted and connected with a connecting nut 3. By adjusting the connecting nut 3, the other end of the pressing plate 5 presses and fixes the upper end pipe of the exhaust manifold 10 on the positioning and supporting assembly. Among them, on the premise that the guide head at the upper end of the second support rod 4 is fitted with the guide groove on the bottom surface of the left end of the pressing plate 5, the upper end of the connecting column 6 passes through the long waist-shaped hole in the middle of the pressing plate 5, thereby providing a condition for the position-adjustable support of the pressing plate 5, so as to ensure that the right end of the pressing plate 5 abuts against the upper end pipe 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 members 2 are fixed on the edge positions of the front side of the upper end surface of the bottom plate 9 at the two corner positions. When the front side edge of the positioning member 2 is parallel to the X-axis of the machine tool, it is the installation direction of the fixture on the machine tool workbench.

[0033] In order to lift the fixture stably and reliably, lifting screws 1 for the overall lifting of the fixture are fixed at the four corner positions of the upper end surface of the bottom plate 9.

[0034] The inclined block 11 is positioned on the bottom plate 9 by the method of one plane and two pins, and fixed to the bottom plate 9 with screws; the positioning plate 12 is positioned on the inclined block 11 by the method of one plane and two pins, and pressed tightly with the 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, used to position the center of the bottom end face of the flange of the exhaust manifold 10 and restrict its rotation; bolts and gaskets fixedly connect the flange 10-1 at the lower end of the exhaust manifold 10 with the inclined block 11 and the positioning plate 12. The support rod 17 is threadedly connected with the bottom plate 9 and fastened with a locking nut 1, used to adjust the up and down positions of the V-shaped block 16, so that the V-shaped groove surface on the upper end face of the V-shaped block 16 contacts the outer cylindrical surface of the upper end pipe of the exhaust manifold 10, playing an auxiliary supporting role. Since the pipe orifice of the upper end pipe of the exhaust manifold 10 extends out from the pressing part, the purpose of setting the V-shaped block 16 is to reduce the vibration during the machining of the pipe orifice of the exhaust manifold 10; the connecting column 6 is fixed on the bottom plate 9, and the screw rod at the upper end of the connecting column 6 is fastened with the connecting nut 3; the support column 7 is fixed on the bottom plate 9, and the support rod 4 is threadedly connected with the upper end of the support column 7 and fastened with a locking nut, playing a role in supporting the pressing plate 5; the screw rod at the upper end of the connecting column 6 passes through the waist-shaped hole in the middle of the pressing plate 5, and the washer and the connecting nut 3 are connected with the screw rod at the upper end of the connecting column 6, playing an auxiliary role in pressing the exhaust manifold 10 on the pressing plate 5; the positioning part 2 is positioned on the bottom plate 9 by the method of one plane and two pins, and pressed tightly with screws. The function of the positioning part 2 is to determine the direction of the tooling; the positioning bushing 8 is used to determine the initial position of the center of the pipe orifice of the upper end pipe of the exhaust manifold 10.

[0035] During operation, the bottom plane of the bottom plate 9 is placed flat on the workbench of the machine tool, and the fixture is pressed tightly on the workbench with T-shaped bolts. Before pressing, align the front side plates of the two positioning parts 2 with the X-axis of the machine tool, so that the fixture is installed on the workbench of the machine tool.

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

[0037] After fixing the bottom end face of the flange 10-1 of the exhaust manifold 10 to the fixture, adjust the first support rod 17 so that the V-groove surface at the upper end of the V-block 16 contacts the outer cylindrical surface of the elbow end of the upper pipe of the exhaust manifold 10, and tighten the fastening nut; install the pressure plate 5, loosen the locking nut, adjust the height of the second support rod 4 so that the pressure plate 5 is horizontal and contacts the upper pipe of the exhaust manifold 10, and tighten the locking nut; sequentially install the washer and the connecting nut 3 on the screw at the upper end of the connecting column 6, and tighten the connecting nut 3 to press the outer circle at the auxiliary support position of the pipe orifice of the upper pipe of the exhaust manifold 10. Determine the initial position of the center of the exhaust manifold pipe orifice in the fixture according to the center of the positioning bushing 8, and then move the machine tool spindle in the Y direction by a distance of h4 and in the Z direction to a distance of h5 from the side of the positioning member 2 according to the initial position of the center of the pipe orifice in the fixture. After determining the theoretical center position of the pipe orifice in this way, process the end face, outer circle, and conical surface of the pipe orifice of the upper pipe of the exhaust manifold 10 respectively according to the requirements in the drawing.

[0038] Control elements of the fixture: To ensure the position accuracy of the processed exhaust manifold pipe orifice, it is necessary to control the angle b1 between the upper plane of the positioning plate 12 and the bottom plane of the bottom plate 8, the coaxiality of the center of the diamond pin 13 and the center of the cylindrical pin 14 with the two reference holes in the positioning plate 12 center and the angle b2 of the coaxiality of the center of the hole with the center and the angle b3 of the coaxiality of the center and the front sides of the two positioning members 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 member 2, and the distance h3 between the center of the positioning bushing 8 and the center of the positioning plate 12.

[0039] In the fixture, the values of h1, h2, h3, h4, h5 and the angles b1, b2, b3 are obtained by establishing a part model with 3D solid 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 pipe orifice. After controlling these values in the fixture, the distances L1, L2, L3 and the angles a1, a2, a3 between the center of the exhaust manifold pipe orifice and the center of the bottom end face of the flange 10-1 of the exhaust manifold 10 are ensured.

[0040] The technical solution of the present invention has a simple structure, novel design, convenient disassembly, simple and reliable positioning, reasonable positioning structure, reduces the processing difficulty, can ensure the qualified three-dimensional space pipe orifice position dimensions of the processed exhaust manifold by controlling the corresponding elements of the fixture, improves the processing accuracy and efficiency, meets the production requirements of parts, and has a wide application range.

[0041] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0042] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard 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. A fixture for milling an exhaust manifold, characterized in that: It includes a bottom plate (9). On the right side of the upper end surface of the bottom plate (9), there is an inclined positioning and supporting device which, when adaptively connected to the flange (10-1) at the lower end of the middle pipe of the exhaust manifold (10), makes the upper pipe of the exhaust manifold (10) in a horizontal state and makes the pipe orifice of the upper elbow end of the exhaust manifold (10) parallel to the corresponding side wall surface of the bottom plate (9). On the left side of the upper end surface of the bottom plate (9), there is a positioning and supporting assembly for supporting the upper elbow end of the exhaust manifold (10) and determining the center position of the pipe orifice. And with the cooperation of the positioning and supporting assembly and the pressing assembly arranged on the upper end surface of the bottom plate (9), the upper elbow end of the exhaust manifold (10) is fixedly supported on the bottom plate (9). The bottom plate (9) is fixedly installed on the machine tool workbench in a fixed direction and makes the pipe orifice of the upper elbow end of the exhaust manifold (10) parallel to the X axis of the machine tool.

2. The fixture for milling of the exhaust manifold according to claim 1, wherein: The inclined positioning and supporting device includes an inclined block (11). The inclined block (11) has a columnar structure with a flat lower end surface and an inclined upper end surface. The lower end of the inclined block (11) is fixedly positioned on the right side of the upper end surface of the bottom plate (9), and a positioning plate (12) for positioning 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 center of the flange (10-1) is positioned and fixed on the positioning plate (12), and with the support of the inclined block (11), the upper pipe of the exhaust manifold (10) is in a horizontal state.

3. The fixture for milling the exhaust manifold according to claim 2, wherein: On the plate surface of the positioning plate (12), diamond pins (13) and cylindrical pins (14) fixed on the wedge block (11) are symmetrically arranged, and the corresponding holes on the bottom surface of the flange (10-1) located on the positioning plate (12) are respectively adapted to the diamond pins (13) and the cylindrical pins (14), realizing anti-rotation positioning and center positioning of the flange (10-1).

4. The fixture for milling the exhaust manifold according to claim 3, wherein: The positioning plate (12) is detachably fixed on the inclined block (11) through a plurality of screws one (15) at the circumferential part.

5. The fixture for milling of exhaust manifold according to claim 1, characterized in that: The positioning and supporting assembly includes a V-shaped block (16), a support rod one (17) and a positioning bushing (8). On the upper end surface of the bottom plate (9), four support rods one (17) whose upper ends of the guide heads are respectively adapted to the guide grooves at the four corners of the bottom surface of the V-shaped block (16) are threadedly connected. And the upper elbow end of the exhaust manifold (10) is adapted to the V-shaped groove on the upper end surface of the V-shaped block (16). The lower end of the support rod one (17) is threadedly connected with a fastening nut, and by adjusting the height of the support rod one (17), the upper pipe of the exhaust manifold (10) is in a horizontal state. A positioning bushing (8) is fixed on the front side wall of the bottom plate (9), and when the center of the pipe orifice of the upper pipe of the exhaust manifold (10) in a horizontal state is on the same straight line as the center of the positioning bushing (8) under the support of the inclined positioning and supporting device, the upper pipe of the exhaust manifold (10) is pressed and fixed by the pressing assembly.

6. The fixture for milling of exhaust manifold according to claim 5, wherein: The pressing assembly includes a support column (7), a connecting column (6) and a pressing plate (5). The support column (7) and the connecting column (6) are both located outside the positioning and supporting assembly, and the lower ends of the support column (7) and the connecting column (6) are both fixed on the bottom plate (9). The upper end of the support column (7) is threadedly connected with a second support rod (4), and the second support rod (4) with the height adjusted in place is locked by a locking nut threadedly connected to the lower end and abutting against the upper end of the support column (7). The guide head at the upper end of the second support rod (4) is adapted to be within the guide groove on the bottom surface of the left end of the pressing plate (5). The screw rod fixed at the upper end of the connecting column (6) passes through the long waist-shaped hole in the middle of the pressing plate (5) and is adapted to be connected with a connecting nut (3), and by adjusting the connecting nut (3), the other end of the pressing plate (5) presses and fixes the upper end pipe of the exhaust manifold (10) on the positioning and supporting assembly.

7. The fixture for milling of exhaust manifold according to any one of claims 1-6, characterized in that: Positioning members (2) are fixed at the edge positions of the front side of the upper end surface of the bottom plate (9) at two corner positions, and the installation direction of the fixture on the machine tool workbench is when the front side edge of the positioning member (2) is parallel to the X-axis of the machine tool.

8. The fixture for milling of exhaust manifolds according to claim 7, characterized in that: Lifting screws (1) for lifting the whole fixture are fixed at the four corner positions of the upper end surface of the bottom plate (9).

Images