Concentric tool for nozzle ring machining

Abstract

The utility model relates to the technical field of nozzle ring machining equipment, in particular to a concentric tool for nozzle ring machining, which comprises a chuck and an inner support clamp, the chuck comprises three upper claws for clamping a mounting disc, and the three upper claws are distributed around the axis of a chuck body; the inner support clamp is fixedly arranged on the chuck body; the inner supporting clamp comprises an inner supporting core rod used for clamping the rear cover, and the inner supporting core rod is located on the inner sides of the three upper claws and is coaxial with the chuck body. By means of the inner supporting core rod, the location degree of the installation disc and the rear cover can be guaranteed, and the production quality of the nozzle ring is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of nozzle ring processing equipment, and specifically relates to a concentric tool used for nozzle ring processing. Background Art

[0002] Turbocharging is one of the development trends in global internal combustion engine technology and the primary method for enhancing internal combustion engines today. Turbocharging technology can significantly increase engine output power, save energy, and reduce engine exhaust pollution. The variable-geometry nozzle ring is a key component in today's advanced variable-geometry turbochargers. Existing nozzle rings are assembled from a dial plate, a mounting plate, a distance sleeve, blades, and a rear cover. The outer diameter of the mounting plate is equal to the outer diameter of the rear cover. The mounting plate and rear cover act as the framework of the nozzle ring. Ensuring the position of the mounting plate and rear cover guarantees the performance of the nozzle ring. Currently, the mounting plate and rear cover are processed separately, and their positional accuracy is not precise enough. The production quality of the nozzle ring needs to be improved. Therefore, how to improve the positional accuracy of the mounting plate and rear cover during the processing process is the problem to be solved in this application. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a concentric tool for nozzle ring processing, which can ensure the position of the mounting plate and the rear cover and improve the production quality of the nozzle ring.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a concentric tooling for nozzle ring processing, comprising a chuck and an inner support fixture, the chuck comprising three upper jaws for clamping the mounting disk, the three upper jaws being distributed around the axis on the chuck body; the inner support fixture being fixed on the chuck body; the inner support fixture comprising an inner support core rod for clamping the back cover, the inner support core rod being located on the inner side of the three upper jaws and the inner support core rod being coaxial with the chuck body; the outer diameter of the inner support core rod being smaller than the inner diameter of the mounting disk.

[0005] Preferably, a second clamping groove is provided on the inner side of the upper end portion of each upper claw, and a first clamping groove is provided at the bottom of the second clamping groove; the three first clamping grooves are coaxially arranged with the inner support core rod; the side wall of the first clamping groove at least partially abuts against the outer edge of the mounting plate; the depth of the first clamping groove is less than the thickness of the mounting plate; the inner diameter of the second clamping groove is greater than the inner diameter of the first clamping groove; and the upper part of the inner support core rod is at least partially located on the upper side of the first clamping groove.

[0006] Preferably, the first clamping groove is in surface contact with the outer edge of the mounting plate.

[0007] Preferably, the internal support fixture also includes a tooling plate, a tensioning block and a tensioning bolt; the tooling plate is fixedly arranged on the inner side of the three upper claws; the internal support core rod is fixedly arranged on the tooling plate; the upper axis of the internal support core rod is provided with an inverted conical groove adapted to the tensioning block; the tensioning bolt passes through the internal support core rod, the tensioning block and the tooling plate and extends toward the inside of the chuck, while the tensioning bolt is connected to the tooling plate by a thread; the internal support core rod is also provided with a plurality of cutout grooves distributed around the axis of the internal support core rod.

[0008] Preferably, the inner support core rod is composed of an inner support portion, an inverted cone portion and a connecting portion which are coaxially arranged in sequence from top to bottom; the outer diameter of the inner support portion is adapted to the inner diameter of the back cover.

[0009] Preferably, the tooling plate and the chuck body are fixed by welding.

[0010] Preferably, the tensioning bolt is loosely fitted to the inner support core rod and the tensioning block.

[0011] Preferably, the tooling plate and the inner support core rod are an integrated structure.

[0012] Preferably, the three upper claws are all located on the outside of the inner support core rod.

[0013] Preferably, the cutout groove extends from the upper end of the inner supporting portion to the connecting portion.

[0014] Compared with the prior art, the beneficial effects of the present invention are: by providing first clamping grooves for clamping the mounting disk on the three upper jaws of the chuck, the three first clamping grooves are coaxial with the chuck body, and by fixing an internal support clamp for clamping the back cover on the chuck, the internal support core rod of the internal support clamp is coaxial with the chuck body, so that the mounting disk and the back cover are coaxial after being clamped at the same time, a good positioning accuracy is obtained, and the production quality of the nozzle ring is ensured. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a cross-sectional view of the concentric tooling of the present utility model;

[0016] Figure 2 This is a schematic diagram of the overall structure of the concentric tooling of the present utility model;

[0017] Figure 3 This is a schematic diagram of the tooling plate and inner support head structure of the present utility model.

[0018] In the figure: 1 chuck, 11 upper jaw, 111 first clamping groove, 112 second clamping groove; 2 inner support fixture, 21 tooling plate, 22 inner support core rod, 23 tensioning block, 24 tensioning bolt, 3 mounting plate, 4 back cover. DETAILED DESCRIPTION

[0019] The following describes the specific embodiments of the present invention in detail in conjunction with the accompanying drawings so that those skilled in the art can more clearly understand how to practice the present invention. Although the present invention is described in conjunction with its preferred specific embodiments, these embodiments are only illustrative, not limiting, of the scope of the present invention.

[0020] See Figure 1-3 In one embodiment of the utility model, a concentric tooling for nozzle ring processing includes: a chuck 1 and an inner support fixture 2, the chuck 1 includes three upper jaws 11 movably arranged on the chuck body 1, and the upper jaws 11 are distributed around the axis of the chuck body 1; the inner support fixture 2 is fixedly arranged on the inner side of the three upper jaws 11, wherein the three upper jaws 11 are used to fix the mounting plate 3 of the nozzle ring, and the inner support fixture 2 is used to fix the back cover 4 of the nozzle ring; using this concentric tooling to clamp the mounting plate 3 and the back cover 4 at the same time and process them together, the mounting plate 3 and the back cover 4 can be fitted and kept concentric and coaxial, and the position of the mounting plate 3 and the back cover 4 after processing is more accurate, thereby ensuring the performance of the nozzle ring.

[0021] Specifically, the chuck 1 uses a conventional three-jaw chuck; a second clamping groove 112 is provided on the inner side of the upper end of each upper jaw 11, and a first clamping groove 111 is provided at the bottom of the second clamping groove 112; the first clamping groove 111 and the second clamping groove 112 are both arc-shaped grooves, and at the same time, the inner diameter of the first clamping groove 111 is smaller than the inner diameter of the second clamping groove 112; the three first clamping grooves 111 are distributed around the axis of the chuck 1 body, and the groove side walls of the three first clamping grooves 111 are all on the same circumference. When in use, the mounting disk 3 is clamped on the inner side of the three upper jaws 11, and the lower end of the mounting disk 3 is abutted against the groove bottom of the first clamping groove 111; the groove side walls of the three first clamping grooves 111 are in contact with the outer edge surface of the mounting disk 3, so that the mounting disk 3 coincides with the axis of the chuck 1 body; the depth of the first clamping groove 111 is less than the thickness of the mounting disk 3.

[0022] Of course, in order to make the mounting plate 3 and the chuck 1 body coaxial, the upper claw 11 and the mounting plate 3 can also be in point contact, and the three or several contact points should be on the same circumference.

[0023] The inner support fixture 2 includes a tooling plate 21, an inner support core rod 22, a tensioning block 23 and a tensioning bolt 24. The tooling plate 21 is arranged on the inner side of the three upper jaws; the tooling plate 21 is fixedly connected to the upper end surface of the chuck 1 body by welding;

[0024] The inner support core rod 22 is provided with a plurality of notches, which are distributed around the axis of the inner support core rod 22; the inner support core rod 22 is composed of an inner support portion, an inverted cone portion, and a connecting portion, which are arranged coaxially from top to bottom; the notches extend from the upper end of the inner support portion to the connecting portion; an inverted cone groove is provided on the upper axis of the inner support core rod 22; a through hole is provided on the axis of the inner support fixture 2, and the inverted cone groove is connected to the through hole; the inner support portion is a cylindrical structure, and is coaxial with the chuck 1 body; the connecting portion is fixedly connected to the center of the tooling plate 21; the outer diameter of the inner support portion is adapted to the inner diameter of the rear cover 4;

[0025] The tensioning block 23 is of a conical structure and is arranged in an inverted conical groove. The outer periphery of the tensioning block 23 is slidably connected to the inner wall of the inverted conical groove. The screw of the tensioning bolt 24 passes through the inner support core rod 22, the tensioning block 23 and the tooling plate 21 and extends toward the inside of the chuck. At the same time, the tensioning bolt 24 is connected to the tooling plate 21 through a threaded connection. The tensioning bolt 24 is loosely fitted to the inner support core rod 22 and the tensioning block 23.

[0026] During processing, the back cover 4 is sleeved on the inner support part, and the lower end of the back cover 4 is fitted with the upper end of the mounting plate 3. By screwing in the tensioning bolt 24, the tensioning block 23 can be sunk and squeeze the inner support core rod 22 to enlarge the outer diameter of the inner support part of the inner support core rod 22, and the inner support part and the back cover 4 are squeezed so that the back cover 4 is clamped by the inner support. By installing this concentric tooling on a CNC machine tool, the mounting plate 3 and the back cover 4 can be drilled at the same time, reducing the position deviation of the mounting plate 3 and the back cover 4 when they are processed separately, ensuring the position of the mounting plate 3 and the back cover 4, and improving the production quality of the nozzle ring by ensuring the position of the mounting plate 3 and the back cover 4.

[0027] In one embodiment, the tooling plate 21 and the inner support core rod 22 are an integrated structure.

[0028] Through this technical solution, first clamping grooves for clamping the mounting disk are opened on the three upper jaws of the chuck, and the three first clamping grooves are coaxial with the chuck body. An internal support clamp for clamping the back cover is fixed on the chuck, and the internal support core rod of the internal support clamp is coaxial with the chuck body, so that the mounting disk and the back cover are coaxial after being clamped at the same time, thereby obtaining good positioning and ensuring the production quality of the nozzle ring.

[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A concentric tool for nozzle ring machining, used to clamp the mounting plate and the rear cover, characterized by: The invention comprises a chuck (1) and an inner support fixture (2), wherein the chuck (1) comprises three upper jaws (11) for clamping a mounting plate, and the three upper jaws (11) are distributed around the axis of the chuck (1) body; the inner support fixture (2) is fixed on the chuck (1) body; the inner support fixture (2) comprises an inner support core rod (22) for clamping a back cover, the inner support core rod (22) is located on the inner side of the three upper jaws (11) and the inner support core rod (22) is coaxial with the chuck (1) body; the outer diameter of the inner support core rod (22) is smaller than the inner diameter of the mounting plate.

2. A concentric tool for nozzle ring machining according to claim 1, characterized in that: A second clamping groove (112) is provided on the inner side of the upper end portion of each upper claw (11), and a first clamping groove (111) is provided at the bottom of the second clamping groove (112); the three first clamping grooves (111) are coaxially arranged with the inner support core rod (22); the side wall of the first clamping groove (111) at least partially abuts against the outer edge of the mounting plate; the depth of the first clamping groove (111) is less than the thickness of the mounting plate; the inner diameter of the second clamping groove (112) is greater than the inner diameter of the first clamping groove (111); and the upper portion of the inner support core rod (22) is at least partially located on the upper side of the first clamping groove (111).

3. The concentric tool for nozzle ring machining according to claim 2, characterized in that: The first clamping groove (111) is in surface contact with the outer edge of the mounting plate.

4. The concentric tool for nozzle ring machining according to claim 1, characterized in that: The inner support fixture (2) further comprises a tooling plate (21), a tensioning block (23) and a tensioning bolt (24); the tooling plate (21) is fixedly arranged on the inner side of the three upper claws (11); the inner support core rod (22) is fixedly arranged on the tooling plate (21); an inverted conical groove adapted to the tensioning block (23) is provided on the upper axis of the inner support core rod (22); the tensioning bolt (24) passes through the inner support core rod (22), the tensioning block (23) and the tooling plate (21) and then extends toward the inside of the chuck, while the tensioning bolt (24) is connected to the tooling plate (21) by a thread; the inner support core rod (22) is also provided with a plurality of cutout grooves distributed around the axis of the inner support core rod (22).

5. The concentric tool for nozzle ring machining according to claim 4, characterized in that: The inner support core rod (22) is composed of an inner support portion, an inverted cone portion, and a connecting portion which are coaxially arranged in sequence from top to bottom; the outer diameter of the inner support portion is adapted to the inner diameter of the rear cover.

6. The concentric tool for nozzle ring machining according to claim 4, characterized in that: The tooling plate (21) and the chuck (1) body are fixed by welding.

7. The concentric tool for nozzle ring machining according to claim 4, characterized in that: The tensioning bolt (24) is loosely fitted to the inner support core rod (22) and the tensioning block (23).

8. The concentric tool for nozzle ring machining according to claim 4, characterized in that: The tooling plate (21) and the inner support core rod (22) are an integrated structure.

9. The concentric tool for nozzle ring machining according to claim 1, characterized in that: The three upper claws (11) are all located outside the inner support core rod (22).

10. The concentric tool for nozzle ring machining according to claim 5, characterized in that: The cutout groove extends from the upper end of the inner supporting portion to the connecting portion.

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