Thermal shape righting tool for casting nozzle ring of gas turbine of bullet train

Abstract

A casting thermal shape correction tool for a jet nozzle ring of a motor car gas turbine comprises a tool base and a tool upper cover, an annular groove used for containing the jet nozzle ring of the motor car gas turbine is formed in the upper portion of the tool base and called as a fixing groove, the fixing groove is formed in the edge of the tool base, and at least two screw holes are formed in the bottom of the fixing groove. The tool base is provided with at least two detachable and matched locking bolts, the positions of the at least two screw holes correspond to positioning holes in a nozzle ring of the motor car gas turbine, the tool upper cover is detachably assembled on the tool base, the upper portion of the tool base is provided with at least two threaded holes, and the tool upper cover is connected with the motor car gas turbine nozzle ring through the at least two bolts. The tool upper cover is detachably pressed on the tool base, and an annular groove corresponding to the fixing groove is formed in the edge of the lower portion of the tool upper cover and called a pressing groove. And through the arrangement of the tool base and the tool upper cover, heating power and mechanical force can be accurately applied, the geometric accuracy of the corrected workpiece is ensured, the correction time is further shortened, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of tooling technology, and in particular to thermal straightening tooling. Background Technology

[0002] In the manufacturing process of nozzle rings for high-speed train gas turbines, casting is one of the key steps. However, due to the complexity of the nozzle ring structure and the uneven distribution of thermal stress in the material at high temperatures, varying degrees of deformation often occur after casting. This deformation not only affects the geometric accuracy of the nozzle ring but may also cause it to fail to meet design requirements during actual operation, thereby affecting the overall performance and efficiency of the gas turbine.

[0003] Traditional orthopedic methods usually rely on manual operation or general orthopedic equipment, but these methods have the problem of insufficient precision. Manual operation is difficult to guarantee the uniformity and consistency of the orthopedic effect, which can easily lead to local stress concentration or secondary deformation. In addition, the size and shape of the nozzle ring are diverse, and general equipment is difficult to meet the orthopedic needs of different models. Utility Model Content

[0004] The purpose of this invention is to provide a hot straightening tooling for casting nozzle rings of gas turbines for high-speed trains, so as to solve the problems existing in the prior art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] The hot straightening fixture for casting the nozzle ring of a gas turbine for high-speed train includes a fixture base and a fixture cover;

[0007] The tooling base has an annular groove above it for placing the gas turbine nozzle ring of the EMU, which is called the fixing groove;

[0008] The fixing groove is located on the edge of the tooling base, and the depth of the fixing groove is less than the height of the gas turbine nozzle ring to be processed.

[0009] The bottom of the fixing groove is provided with at least two screw holes and at least two detachable matching locking bolts;

[0010] At least two screw holes are positioned to correspond to the positioning holes on the gas turbine nozzle ring of the EMU;

[0011] The tooling base is detachably equipped with a tooling cover;

[0012] The upper part of the tooling base is provided with at least two threaded holes;

[0013] The tooling cover is removably clamped to the tooling base by at least two bolts;

[0014] The bolt head, used for tightening the bolt, is positioned above the tooling cover;

[0015] The lower edge of the tooling cover has an annular groove corresponding to the fixing groove, which is called the clamping groove;

[0016] After the fixing groove and the clamping groove are combined, the distance between the bottoms of the two grooves is no greater than the height of the corrected EMU gas turbine nozzle ring.

[0017] By adopting the above technical solution, the function of the tooling base and the tooling cover is to fix the EMU gas turbine nozzle ring between them. The EMU gas turbine nozzle ring can be fixed in the screw hole at the bottom of the fixing groove and the locking bolt installed in the screw hole. After the EMU gas turbine nozzle ring is fixed, the tooling cover is fixed on the top of the EMU gas turbine nozzle ring and tightened with bolts. After the clamping groove under the tooling cover is tightly fitted with the fixing groove, the EMU gas turbine nozzle ring can be shrunk to the required height through heat straightening after heating. At the same time, the fixing groove is set on the edge of the tooling base and the clamping groove is also set on the edge of the tooling cover. This allows the edge of the EMU gas turbine nozzle ring to be exposed after pressing, which is convenient for workers to inspect and process the straightening from the side. The entire heat straightening process is carried out by the heat treatment furnace and the tooling together, reducing manual operation and improving the yield and work efficiency.

[0018] In a further embodiment, the tooling base is a frustum-shaped tooling base, and the tooling base is provided with a first upper step surface, a second upper step surface, a third upper step surface and a fourth upper step surface from top to bottom, and the first upper step surface, the second upper step surface, the third upper step surface and the fourth upper step surface are all coaxially arranged.

[0019] A limiting frustum is provided at the top of the first upper step surface;

[0020] The tooling cover is a frustum-shaped tooling cover, and the tooling cover is provided with a first lower step surface, a second lower step surface and a third lower step surface from bottom to top. The first lower step surface, the second lower step surface and the third lower step surface are all coaxially arranged.

[0021] The bottom of the first lower step surface is provided with a frustum-shaped groove corresponding to the limiting frustum, which is called the frustum limiting groove.

[0022] In a further embodiment, a first bevel is provided at the periphery of both the first upper step surface and the second lower step surface;

[0023] A second bevel is provided at the outer periphery of both the second upper step surface and the second lower step surface, and a third bevel is provided at the inner periphery of both the second upper step surface and the second lower step surface.

[0024] By adopting the above technical solution, the diameter of each upper step surface gradually increases from top to bottom, while the diameter of each lower step surface gradually increases from bottom to top. This matches the shape of the gas turbine nozzle ring to be corrected, enabling precise application of heat and mechanical force. This allows the entire workpiece to be corrected to be rapidly heated, softened, and deformed, ensuring geometric accuracy after correction while further shortening correction time and improving production efficiency. Multiple bevels can disperse the stress generated during the heat correction process, preventing stress concentration in a certain area and reducing the risk of workpiece deformation or cracking. When pressurizing the workpiece at high temperatures, the bevels can guide the stress to be evenly distributed, protecting the structural integrity of the workpiece. At the same time, bevels at different locations help to evenly conduct heat, avoiding local overheating or uneven heat distribution, improving the accuracy of heat correction, and ensuring that the workpiece meets the expected shape and size requirements.

[0025] In a further embodiment, the third upper step surface is provided with a plurality of first semi-waist-shaped grooves at equal intervals in the circumferential direction, and the third lower step surface is provided with a plurality of second semi-waist-shaped grooves at equal intervals in the circumferential direction.

[0026] By adopting the above technical solution, these semi-waist-shaped grooves are all cut in half from the middle, and the cut-off part is exactly at the outer edge of the step surface. The main function of these semi-waist-shaped grooves is to identify whether the workpiece to be corrected has been installed in place. If not, a part of the semi-waist-shaped groove at a certain point will be covered by the workpiece. At this time, the semi-waist-shaped groove can be used as a reference to push the workpiece to make corresponding adjustments, which greatly improves the efficiency and accuracy of tooling fixation.

[0027] In a further embodiment, at least two first fixing rods are inserted into the side of the tooling base, and at least two second fixing rods are inserted into the side of the tooling cover.

[0028] By adopting the above technical solutions, these fixed round rods can ensure that the workpiece remains stable during the heat straightening process and will not shift or slide. They also ensure that the workpiece maintains the correct position during heating and pressurization, preventing safety accidents. The design of the fixed rods also facilitates the installation, adjustment and disassembly of the tooling, which can effectively improve operating efficiency.

[0029] In a further embodiment, the limiting frustum includes a fixed part and a variable diameter part. The bottom of the fixed part is fixedly connected to the top middle position of the tooling base. The top of the fixed part is provided with a variable diameter part. The diameter of the variable diameter part gradually decreases from bottom to top. The connection between the fixed part and the variable diameter part is provided with an arc. The top periphery of the variable diameter part is provided with a fourth bevel.

[0030] By adopting the above technical solution, the fourth bevel does not directly contact the workpiece. Its function is more to better engage with the frustum limiting groove. During the process of tooling base and tooling cover mating, it provides a guiding function to ensure that the two can be quickly and accurately aligned when docking. It also alleviates local deformation or damage caused by stress concentration at the edge of the contact surface during assembly, thus increasing safety.

[0031] In summary, this utility model has the following beneficial effects:

[0032] 1. By setting up the tooling base and tooling top cover, multiple upper and lower stepped surfaces can be used to fix the workpiece. In addition to fixing the workpiece, the bevel around the stepped surface can also disperse the stress generated during the heat straightening process, avoiding stress concentration in a certain area, thereby reducing the risk of workpiece deformation or cracking. When the workpiece is pressurized at high temperature, the bevel can guide the stress to be evenly distributed, protecting the structural integrity of the workpiece. At the same time, the bevel at different positions helps to conduct heat evenly, avoiding local overheating or uneven heat distribution, improving the accuracy of heat straightening, and ensuring that the workpiece meets the expected shape and size requirements. While ensuring the straightening accuracy, it also has the effect of further shortening the straightening time and improving production efficiency.

[0033] 2. By setting up semi-waist-shaped grooves, these semi-waist-shaped grooves are cut off in the middle, and the cut-off part is exactly at the outer edge of the step surface. The main function of these semi-waist-shaped grooves is to identify whether the workpiece to be corrected has been installed in place. If it is not installed in place, then a part of the semi-waist-shaped groove in a certain place will be covered by the workpiece. At this time, the semi-waist-shaped groove can be used as a reference to push the workpiece to make corresponding adjustments, which can greatly improve the efficiency and accuracy of tooling fixation.

[0034] 3. By setting the limiting frustum, the fourth bevel at the top of the variable diameter part can better engage with the limiting groove of the frustum. During the process of fitting the tooling base and the tooling cover, it provides a good guiding effect, ensuring that the two can be quickly and accurately aligned when docking. It also alleviates local deformation or damage caused by stress concentration at the edge of the contact surface during assembly, thus increasing safety. Attached Figure Description

[0035] Figure 1 This is an overall schematic diagram of the present invention;

[0036] Figure 2 This is a schematic diagram illustrating the positional relationship between the tooling base and the tooling cover in this utility model.

[0037] In the figure, 1 is the tooling base; 2 is the tooling cover; 3 is the limiting frustum; 31 is the fixing part; 32 is the diameter changing part; 4 is the first bevel; 5 is the second bevel; 6 is the third bevel; 7 is the first fixed round rod; 8 is the second fixed round rod; and 9 is the fourth bevel. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to the accompanying drawings.

[0039] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0040] like Figure 1 - Figure 2 As shown, the hot straightening fixture for casting the nozzle ring of the gas turbine of a high-speed train includes a fixture base 1 and a fixture cover 2.

[0041] The tooling base 1 has an annular groove above it for placing the gas turbine nozzle ring of the EMU, which is called the fixing groove;

[0042] The fixing groove is set on the edge of the tooling base 1, and the depth of the fixing groove is less than the height of the gas turbine nozzle ring to be processed.

[0043] The bottom of the fixing groove is provided with at least two screw holes and at least two detachable matching locking bolts;

[0044] At least two screw holes are positioned to correspond to the positioning holes on the gas turbine nozzle ring of the EMU;

[0045] The tooling base 1 is detachably equipped with a tooling cover 2;

[0046] The upper part of the tooling base 1 is provided with at least two threaded holes;

[0047] The tooling cover 2 is detachably pressed onto the tooling base 1 by at least two bolts;

[0048] The bolt head, used for tightening the bolt, is positioned above the upper cover 2 of the tooling;

[0049] The lower edge of the tool cover 2 is provided with an annular groove corresponding to the fixing groove, which is called the clamping groove;

[0050] After the fixing groove and the clamping groove are combined, the distance between the bottoms of the two grooves is no greater than the height of the corrected EMU gas turbine nozzle ring.

[0051] In this embodiment, the tooling base 1 and tooling cover 2 are used to fix the EMU gas turbine nozzle ring between them. The EMU gas turbine nozzle ring can be fixed in the screw hole at the bottom of the fixing groove and the locking bolt installed in the screw hole. After the EMU gas turbine nozzle ring is fixed, the tooling cover 2 is fixed on the top of the EMU gas turbine nozzle ring and tightened with bolts. After the clamping groove under the tooling cover 2 is tightly fitted with the fixing groove, the EMU gas turbine nozzle ring can be shrunk to the required height through heat straightening after heating. At the same time, the fixing groove is set on the edge of the tooling base 1 and the clamping groove is also set on the edge of the tooling cover 2. This allows the edge of the EMU gas turbine nozzle ring to be exposed after pressing, which is convenient for workers to inspect and process the straightening from the side. The entire heat straightening process is carried out by the heat treatment furnace and tooling in cooperation, reducing manual operation and improving the yield and work efficiency.

[0052] Furthermore, the tooling base 1 is a frustum-shaped tooling base 1, and the tooling base 1 is provided with a first upper step surface, a second upper step surface, a third upper step surface and a fourth upper step surface from top to bottom. The first upper step surface, the second upper step surface, the third upper step surface and the fourth upper step surface are all coaxially arranged.

[0053] A limiting frustum 3 is provided at the top of the first upper step surface;

[0054] The tooling cover 2 is a frustum-shaped tooling cover 2. The tooling cover 2 has a first lower step surface, a second lower step surface and a third lower step surface from bottom to top. The first lower step surface, the second lower step surface and the third lower step surface are all coaxially arranged.

[0055] The bottom of the first lower step surface is provided with a frustum-shaped groove corresponding to the limiting frustum 3, which is called the frustum limiting groove.

[0056] Furthermore, a first bevel 4 is provided at the periphery of both the first upper step surface and the second lower step surface;

[0057] A second bevel 5 is provided at the outer periphery of both the second upper step surface and the second lower step surface, and a third bevel 6 is provided at the inner periphery of both the second upper step surface and the second lower step surface.

[0058] In this embodiment, the diameter of each upper step surface gradually increases from top to bottom, while the diameter of each lower step surface gradually increases from bottom to top. This matches the shape of the gas turbine nozzle ring to be corrected, enabling precise application of heat and mechanical force. This allows the entire workpiece to be corrected to be rapidly heated, softened, and deformed, ensuring geometric accuracy after correction while further shortening correction time and improving production efficiency. Multiple bevels can disperse the stress generated during the heat correction process, preventing stress concentration in a certain area and reducing the risk of workpiece deformation or cracking. When pressurizing the workpiece at high temperatures, the bevels can guide the stress to be evenly distributed, protecting the structural integrity of the workpiece. At the same time, bevels at different locations help to evenly conduct heat, avoiding local overheating or uneven heat distribution, improving the accuracy of heat correction, and ensuring that the workpiece meets the expected shape and size requirements.

[0059] Furthermore, the periphery of the third upper step surface is provided with multiple first semi-waist-shaped grooves at equal intervals, and the periphery of the third lower step surface is provided with multiple second semi-waist-shaped grooves at equal intervals.

[0060] In this embodiment, these semi-waist-shaped grooves are all cut in half from the middle, and the cut-off part is exactly at the outer edge of the step surface. The main function of these semi-waist-shaped grooves is to identify whether the workpiece to be corrected has been installed in place. If not, a part of the semi-waist-shaped groove at a certain point will be covered by the workpiece. At this time, the semi-waist-shaped groove can be used as a reference to push the workpiece to make corresponding adjustments, which greatly improves the efficiency and accuracy of tooling fixation.

[0061] Furthermore, at least two first fixing rods 7 are inserted into the side of the tooling base 1, and at least two second fixing rods 8 are inserted into the side of the tooling cover 2.

[0062] In this embodiment, these fixed round rods ensure that the workpiece remains stable during the heat straightening process and does not shift or slide. They also ensure that the workpiece maintains the correct position during heating and pressurization, preventing safety accidents. The design of the fixed rods also facilitates the installation, adjustment and disassembly of the tooling, which can effectively improve operating efficiency.

[0063] Furthermore, the limiting truncated cone 3 includes a fixed part 31 and a variable diameter part 32. The bottom of the fixed part 31 is fixedly connected to the top middle position of the tooling base 1. The top of the fixed part 31 is provided with a variable diameter part 32. The diameter of the variable diameter part 32 gradually decreases from bottom to top. The connection between the fixed part 31 and the variable diameter part 32 is provided with an arc. The top periphery of the variable diameter part 32 is provided with a fourth bevel 9.

[0064] In this embodiment, the fourth bevel 9 does not directly contact the workpiece. Its main function is to better engage with the frustum limiting groove. During the engagement of the tooling base 1 and the tooling cover 2, it provides a guiding function to ensure that the two can be quickly and accurately aligned when docking. It also alleviates local deformation or damage caused by stress concentration at the edge of the contact surface during assembly, thus increasing safety.

[0065] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0066] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A hot straightening tooling for casting nozzle rings of high-speed train gas turbines, characterized in that: It includes a tooling base (1) and a tooling cover (2); The tooling base (1) has an annular groove above it for placing the gas turbine nozzle ring of the EMU, which is called the fixing groove; The fixing groove is set at the edge of the tooling base (1), and the depth of the fixing groove is less than the height of the gas turbine nozzle ring to be processed. The bottom of the fixing groove is provided with at least two screw holes and at least two detachable matching locking bolts; At least two screw holes are positioned to correspond to the positioning holes on the gas turbine nozzle ring of the EMU; The tooling base (1) is detachably fitted with a tooling cover (2); The tooling base (1) has at least two threaded holes on its upper part; The tool cover (2) is detachably pressed onto the tool base (1) by at least two bolts; The bolt head for tightening the bolt is positioned above the tool cover (2); The lower edge of the tool cover (2) is provided with an annular groove corresponding to the fixing groove, which is called the clamping groove; After the fixing groove and the clamping groove are combined, the distance between the bottoms of the two grooves is no greater than the height of the corrected EMU gas turbine nozzle ring.

2. The hot straightening fixture for casting the nozzle ring of a gas turbine for high-speed trains according to claim 1, characterized in that: The tooling base (1) is a frustum-shaped tooling base (1). The tooling base (1) is provided with a first upper step surface, a second upper step surface, a third upper step surface and a fourth upper step surface from top to bottom. The first upper step surface, the second upper step surface, the third upper step surface and the fourth upper step surface are all coaxially arranged. A limiting frustum (3) is provided at the top of the first upper step surface; The tool cover (2) is a frustum-shaped tool cover (2). The tool cover (2) is provided with a first lower step surface, a second lower step surface and a third lower step surface from bottom to top. The first lower step surface, the second lower step surface and the third lower step surface are all coaxially arranged. The bottom of the first lower step surface is provided with a frustum-shaped groove corresponding to the limiting frustum (3), which is called the frustum limiting groove.

3. The hot straightening fixture for casting the nozzle ring of a gas turbine for high-speed trains according to claim 2, characterized in that: A first bevel (4) is provided at the periphery of both the first upper step surface and the second lower step surface; A second bevel (5) is provided at the outer periphery of the second upper step surface and the second lower step surface, and a third bevel (6) is provided at the inner periphery of the second upper step surface and the second lower step surface.

4. The hot straightening fixture for casting the nozzle ring of a gas turbine for high-speed trains according to claim 2, characterized in that: The third upper step surface is provided with a plurality of first semi-waist-shaped grooves at equal intervals along its periphery, and the third lower step surface is provided with a plurality of second semi-waist-shaped grooves at equal intervals along its periphery.

5. The hot straightening fixture for casting the nozzle ring of a gas turbine for high-speed trains according to claim 1, characterized in that: At least two first fixed round rods (7) are inserted into the side of the tooling base (1), and at least two second fixed round rods (8) are inserted into the side of the tooling cover (2).

6. The hot straightening fixture for casting the nozzle ring of a gas turbine for high-speed trains according to claim 2, characterized in that: The limiting frustum (3) includes a fixed part (31) and a variable diameter part (32). The bottom of the fixed part (31) is fixedly connected to the top middle position of the tooling base (1). The top of the fixed part (31) is provided with a variable diameter part (32). The diameter of the variable diameter part (32) gradually decreases from bottom to top. The connection between the fixed part (31) and the variable diameter part (32) is provided with an arc. The top periphery of the variable diameter part (32) is provided with a fourth bevel (9).

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