A tooling and welding method for welding high-precision thin-walled ring parts.

Abstract

The present invention discloses a tool for welding high-precision thin-walled annular parts and a welding method thereof, and belongs to the technical field of welding process of high-precision thin-walled annular parts of turbines; the tool comprises an outer lining of a cylindrical structure, the middle part of the outer lining is a hollow structure, and an inner lining is also arranged inside the central control; the outer lining is made of copper, and the inner lining is made of stainless steel, the outer side surface of the inner lining matches the inner side surface of the outer lining, and is fixedly assembled; the outer lining is also provided with a plurality of cooling channels and heating channels; the present invention adopts the principle of thermal expansion and contraction to realize the assembly of high-precision thin-walled annular parts, provides better supporting force during the welding process, achieves high-precision dimensional control requirements by accurately controlling the thermal expansion of the temperature, and installs a stainless steel rigid lining with a larger linear expansion coefficient inside the device to increase the service life of the device.

Description

Technical Field

[0001] The invention relates to a tool for welding high-precision thin-walled annular parts and a welding method thereof, belonging to the technical field of welding technology for high-precision thin-walled annular parts of turbines. Background Art

[0002] After large turbine power equipment is put into operation, due to the harsh operating environment, especially the turbine components of the gas turbine need to withstand high temperatures of more than 1000°C, such as the burner inner tube, tail tube and other annular parts have high dimensional accuracy requirements, and their dimensional accuracy seriously affects the efficiency and safety of the gas turbine.

[0003] It is extremely difficult to repair thin-walled annular components of gas turbines, and the requirements for part size are extremely high. During welding, the welds often become elliptical and deformed irregularly. It is necessary to use new intelligent devices for annular parts to improve the dimensional accuracy of annular parts after welding. Summary of the invention

[0004] The purpose of the present invention is to provide a tooling and a welding method for high-precision thin-walled annular parts welding in response to the above-mentioned problems. The principle of thermal expansion and contraction is utilized to establish special hot channels and cold channels. The temperature is precisely thermally expanded to achieve high-precision dimensional control requirements. A stainless steel rigid lining with a larger linear expansion coefficient is installed inside the device to increase the service life of the device.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A tool for welding high-precision thin-walled annular parts, comprising an outer liner of a cylindrical structure, the middle part of the outer liner is a hollow structure, and an inner liner is also arranged inside the central control;

[0007] The outer lining is made of copper, the inner lining is made of stainless steel, the outer side of the inner lining matches the inner side of the outer lining, and they are fixedly assembled;

[0008] The outer lining is also provided with a plurality of cooling channels and heating channels, the cooling channels and heating channels are opened along the axial direction of the outer lining, the plurality of cooling channels and heating channels are distributed along the circumferential direction, and the cooling channels and heating channels are cross-arranged.

[0009] Furthermore, one end of the cooling channel is connected to a cooling medium inlet, and the cooling medium is introduced into the cooling medium through the cooling medium inlet. The other end of the cooling channel is connected to a cooling medium outlet.

[0010] Furthermore, at least one end of the heating channel is an open structure, through which a heating rod can pass.

[0011] Furthermore, one end of the heating channel is connected to a heating medium inlet of the heating medium, and the other end is connected to a heating medium outlet.

[0012] Furthermore, the cooling medium inlet and the cooling medium outlet are connected to a cooling medium temperature control system, the heating medium inlet and the heating medium outlet are connected to a heating medium temperature control system, and the cooling medium inlet and the heating medium outlet are located at one end of the outer lining, and the heating medium inlet and the cooling medium outlet are located at the other end of the outer lining.

[0013] Furthermore, the outer lining and / or the inner lining is also provided with a temperature detection device, and the temperature of the outer lining is detected by the temperature detection device to control the temperature of the outer lining and realize the thermal expansion and contraction of the outer lining.

[0014] A welding method for high-precision thin-walled annular parts welding, using the above-mentioned tooling for high-precision thin-walled annular parts welding, comprises the following steps:

[0015] S1, tooling design, based on the structure and size of high-precision thin-walled annular parts, design the corresponding outer lining size and inner lining size;

[0016] S2, tooling manufacturing, according to the size and structure of the outer lining, the cooling channel and the heating channel are processed on the outer lining. At the same time, the cooling channel and the heating channel are cross-distributed and distributed in a circular array, and the outer lining and the inner lining are welded into one body. The two ends of the cooling channel and the heating channel are connected to the medium pipe opening through pipelines respectively;

[0017] S3, after the tooling is manufactured and formed, the tooling is assembled and positioned with the high-precision thin-walled annular part, the medium pipe port of the heating medium is connected to the heating medium temperature control system, and the heating medium is introduced. The introduction of the heating medium and the heating of the tooling are controlled according to the temperature detection device, so that the tooling expands, thereby forming an interference fit between the tooling and the high-precision thin-walled annular part. After meeting the requirements and maintaining the corresponding temperature, the high-precision thin-walled annular part is welded;

[0018] S4, after the welding process of the high-precision thin-walled annular parts is completed, the heating medium is stopped to heat the tooling, the cooling medium pipe port is connected to the cooling medium temperature control system, and the cooling medium is introduced to cool the tooling to the target temperature, so that the tooling cools and shrinks, and the system is disconnected after the tooling and the high-precision thin-walled annular parts are demoulded, and the high-precision thin-walled annular parts are removed to complete the welding repair.

[0019] Furthermore, in step S3 and step S4, the temperature detection device detects the temperature and feeds back the data to the central control system, and the central control system controls the temperature of the cooling medium temperature control system and the heating medium temperature control system to achieve temperature control of the tooling.

[0020] Furthermore, in step S3, an interference fit is formed between the tooling and the high-precision thin-walled annular part, and the interference fit parameter requirement is 0.05-0.1 mm.

[0021] Furthermore, in step S3, before the tooling is assembled with the high-precision thin-walled annular part, the cooling medium temperature control system is first connected to cool the tooling.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] The present invention discloses a tooling and a welding method for welding high-precision thin-walled annular parts. Based on the precision requirements of thin-walled annular parts, in particular, when the side wall thickness of the workpiece is relatively low and the workpiece is easily deformed during welding, the principle of thermal expansion and contraction is adopted to realize the assembly of high-precision thin-walled annular parts. Since the change of thermal barrier and contraction is small and it has a certain expansion and contraction effect, it effectively realizes the assembly of high-precision thin-walled annular parts and provides better supporting force during the welding process. By accurately controlling the thermal expansion of the temperature, the high-precision dimensional control requirements are met, and a stainless steel rigid lining with a larger linear expansion coefficient is installed inside the device to increase the service life of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0025] Figure 1 It is a schematic diagram of the structure of the overall system of the present invention;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of the tooling of the present invention;

[0027] Figure 3 It is a schematic diagram of the local cross-sectional structure of the outer lining of the present invention.

[0028] Markings in the figure: 1-outer lining, 2-inner lining, 3-cooling channel, 4-heating channel, 5-high-precision thin-walled annular part, 6-temperature detection device, 7-cooling medium temperature control system, 8-heating medium temperature control system, 9-central control system, 10-cooling medium inlet, 11-cooling medium outlet, 12-heating medium inlet, 13-heating medium outlet. DETAILED DESCRIPTION

[0029] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0030] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0031] Example 1

[0032] A tool for welding high-precision thin-walled annular parts 5, such as Figures 1 to 3 As shown, it includes an outer lining 1 of a cylindrical structure, the middle part of the outer lining 1 is a hollow structure, and an inner lining 2 is also arranged inside the central control;

[0033] The outer lining 1 is made of copper, and the inner lining 2 is made of stainless steel. The outer side surface of the inner lining 2 matches the inner side surface of the outer lining 1 and is fixedly assembled.

[0034] The outer lining 1 is also provided with a plurality of cooling channels 3 and heating channels 4, which are opened along the axial direction of the outer lining 1, distributed along the circumferential direction, and are cross-arranged.

[0035] In this embodiment, as a specific design, independent cooling channels 3 and heating channels 4 are used in the structural design, and metal materials are used in the design of the tooling. On the one hand, the effect of thermal expansion and contraction is taken into consideration, and at the same time, the design can effectively control whether the tooling needs to shrink or expand more accurately. The use of metal properties with better stability is also to facilitate more stable changes in physical quantities as the temperature changes, thereby further ensuring the high-precision requirements of the entire tooling during the assembly process.

[0036] As a more specific design, one end of the cooling channel 3 is connected to a cooling medium inlet 10 , through which the cooling medium is introduced, and the other end of the cooling channel 3 is connected to a cooling medium outlet 11 .

[0037] As a similar design, one end of the heating channel 4 is connected to a heating medium inlet 12 of the heating medium, and the other end is connected to a heating medium outlet 13 .

[0038] In the above specific design, the design of the entire structure can effectively realize the circulation of the entire medium, and ensure the heating or cooling effect of the entire tooling, and can be adjusted accordingly according to the temperature requirements of the entire tooling. As a specific structural design, in this design, the cooling medium inlet 10, the cooling medium outlet 11, the heating medium inlet 12, and the heating medium outlet 13 are collectively referred to as medium nozzles, and the one used for cooling the medium is called the cooling medium nozzle, and the one used for heating the medium is called the heating medium nozzle. In the specific structural design, the medium nozzle is a main nozzle, and a plurality of branch pipes are set. Each branch pipe corresponds to a cooling channel 3 or a heating channel 4, so as to effectively realize the circulation of the medium. At the same time, the branch pipes can be fixed by welding at both ends. Of course, at this time, the branch pipes can be made of metal pipes, which can further ensure the sealing. As a design in which a main pipe connects multiple branches, its structure is easy to think of in this field, so the detailed display of the structure is omitted in the accompanying drawings.

[0039] Based on the above-mentioned specific structural design, another specific implementation can be adopted for the heating channel 4, wherein at least one end of the heating channel 4 is an open structure, which can pass through the heating rod. This design method can make the tooling do not need to circulate the heating medium during the heating process, and directly use resistance heating, etc. to meet the heating process requirements.

[0040] Based on the above specific structural design, a further optimized design is made, the cooling medium inlet 10 and the cooling medium outlet 11 are connected to the cooling medium temperature control system 7, the heating medium inlet 12 and the heating medium outlet 13 are connected to the heating medium temperature control system 8, and the cooling medium inlet 10 and the heating medium outlet 13 are located at one end of the outer lining 1, and the heating medium inlet 12 and the cooling medium outlet 11 are located at the other end of the outer lining 1. Based on the design of this structure, the purpose of its design is to achieve the circulation and recovery of the medium. More specifically, the above cooling channel 3 and the heating channel 4 both penetrate along the axial direction of the outer lining 1. In a more specific design, in this design, the medium pipe mouth is connected to the temperature control system through a pipe (hose or metal pipe, preferably a hose).

[0041] In order to further achieve temperature control and accurately control the expansion or contraction of the tooling, the outer lining 1 and / or the inner lining 2 is also provided with a temperature detection device 6, and the temperature of the outer lining 1 is detected by the temperature detection device 6 to control the temperature of the outer lining 1 and realize the thermal expansion and contraction of the outer lining 1.

[0042] In the above-mentioned specific structural design, as a specific control requirement, the temperature detection device 6 collects relevant temperature parameters, and the temperature and expansion relationship is entered into the terminal (central control system 9), and the expansion and contraction are further calculated according to the collected temperature, and the above-mentioned cooling medium temperature control system 7 and / or heating medium temperature control system 8 working information is given to control the temperature of the medium in real time. In the specific structure, the temperature measurement device and the cooling / heating medium temperature control system 8 are all linked to the central control system 9 by electrical signals, thereby realizing electrical signal transmission.

[0043] Example 2

[0044] Based on the tooling of Example 1, combined with the actual process of repairing and welding high-temperature thin-walled annular parts, as a more specific method, a high-precision thin-walled annular part 5 welding method includes the following steps:

[0045] S1, design of tooling, based on the structure and size of the high-precision thin-walled annular part 5, design the corresponding size of the outer liner 1 and the inner liner 2;

[0046] S2, tooling manufacturing, according to the size and structure of the outer lining 1, the cooling channel 3 and the heating channel 4 are processed on the outer lining 1, at the same time, the cooling channel 3 and the heating channel 4 are cross-distributed and distributed in a circular array, and the outer lining 1 and the inner lining 2 are welded into one body, and the two ends of the cooling channel 3 and the heating channel 4 are connected to the medium pipe opening through pipelines respectively;

[0047] S3, after the tooling is manufactured and formed, the tooling is assembled and positioned with the high-precision thin-walled annular part 5, the medium pipe port of the heating medium is connected with the heating medium temperature control system 8, and the heating medium is introduced, and the introduction of the heating medium and the heating of the tooling are controlled according to the temperature detection device 6, so that the tooling expands, so that an interference fit is formed between the tooling and the high-precision thin-walled annular part 5, and after the requirements are met and the corresponding temperature is maintained, the welding process of the high-precision thin-walled annular part 5 is performed;

[0048] S4, after the welding process of the high-precision thin-walled annular part 5 is completed, the heating medium is stopped to heat the tooling, the cooling medium pipe mouth is connected to the cooling medium temperature control system 7, and the cooling medium is introduced to cool the tooling to the target temperature, so that the tooling cools and shrinks, and the system is disconnected after the tooling and the high-precision thin-walled annular part 5 are demoulded, and the high-precision thin-walled annular part 5 is removed to complete the welding repair.

[0049] Furthermore, in step S3 and step S4, the temperature detection device 6 detects the temperature and feeds back the data to the central control system 9, and the central control system 9 controls the temperature of the cooling medium temperature control system 7 and the heating medium temperature control system 8 to achieve temperature control of the tooling.

[0050] Furthermore, in step S3, an interference fit is formed between the tooling and the high-precision thin-walled annular part 5, and the interference fit parameter requirement is 0.05-0.1mm. As a more specific design description, based on the high-precision requirement of the processed parts as the design of the assembly coefficient, according to the continuous attempts of actual operation combined with the thickness of the processed parts, the clamping of the annular parts can be fully realized within the above-mentioned specific parameter value range, and the processed parts are within the force range of the recoverable elastic variable. Therefore, a reasonable supporting force can be effectively obtained without causing damage to the processed parts, thereby effectively ensuring the accuracy of the high-precision thin-walled ring and ensuring that no deformation is caused to the parts in the repair welding process.

[0051] Furthermore, in step S3, before the tooling is assembled with the high-precision thin-walled annular part 5, the cooling medium temperature control system 7 is first connected to cool the tooling.

[0052] In summary, the present invention is a tooling for welding high-precision thin-walled annular parts and a welding method thereof, based on the precision requirements of thin-walled annular parts, especially on the basis that the side wall thickness of the workpiece is relatively low and the workpiece is easily deformed during welding, and the principle of thermal expansion and contraction is adopted to realize the assembly of high-precision thin-walled annular parts. Since the change of thermal barrier and contraction is small and it has a certain expansion and contraction effect, it effectively realizes the assembly of high-precision thin-walled annular parts and provides better support during the welding process. By accurately controlling the thermal expansion of the temperature, the high-precision dimensional control requirements are met, and a stainless steel rigid lining with a larger linear expansion coefficient is installed inside the device to increase the service life of the device.

[0053] The present invention is not limited to the above-mentioned specific embodiments, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A tool for welding high-precision thin-walled annular parts, characterized in that: A tooling for welding high-precision thin-walled annular parts is used, wherein the tooling comprises an outer liner of a cylindrical structure, the middle of the outer liner is a hollow structure, and an inner liner is also arranged inside the hollow structure; The outer lining is made of copper, the inner lining is made of stainless steel, the outer side of the inner lining matches the inner side of the outer lining, and they are fixedly assembled; The outer lining is also provided with a plurality of cooling channels and heating channels, the cooling channels and heating channels are opened along the axial direction of the outer lining, the plurality of cooling channels and heating channels are distributed along the circumferential direction, and the cooling channels and heating channels are cross-arranged; One end of the cooling channel is connected to a cooling medium inlet, through which the cooling medium is introduced, and the other end of the cooling channel is connected to a cooling medium outlet; At least one end of the heating channel is in an open structure, through which a heating rod can pass; One end of the heating channel is connected to a heating medium inlet of the heating medium, and the other end is connected to a heating medium outlet; The cooling medium inlet and the cooling medium outlet are connected to a cooling medium temperature control system, the heating medium inlet and the heating medium outlet are connected to a heating medium temperature control system, and the cooling medium inlet and the heating medium outlet are located at one end of the outer lining, and the heating medium inlet and the cooling medium outlet are located at the other end of the outer lining; The outer lining and / or the inner lining is also provided with a temperature detection device, and the temperature of the outer lining is detected by the temperature detection device, so as to control the temperature of the outer lining and realize the thermal expansion and contraction of the outer lining; The following steps are involved: S1, tooling design, based on the structure and size of high-precision thin-walled annular parts, design the corresponding outer lining size and inner lining size; S2, tooling manufacturing, according to the size and structure of the outer lining, the cooling channel and the heating channel are processed on the outer lining. At the same time, the cooling channel and the heating channel are cross-distributed and distributed in a circular array, and the outer lining and the inner lining are welded into one body. The two ends of the cooling channel and the heating channel are connected to the medium pipe opening through pipelines respectively; S3, after the tooling is manufactured and formed, the tooling is assembled and positioned with the high-precision thin-walled annular part, the medium pipe port of the heating medium is connected to the heating medium temperature control system, and the heating medium is introduced. The introduction of the heating medium and the heating of the tooling are controlled according to the temperature detection device, so that the tooling expands, thereby forming an interference fit between the tooling and the high-precision thin-walled annular part. After meeting the requirements and maintaining the corresponding temperature, the high-precision thin-walled annular part is welded; S4, after the welding process of the high-precision thin-walled annular parts is completed, the heating medium is stopped to heat the tooling, the cooling medium pipe port is connected to the cooling medium temperature control system, and the cooling medium is introduced to cool the tooling to the target temperature, so that the tooling cools and shrinks, and the system is disconnected after the tooling and the high-precision thin-walled annular parts are demoulded, and the high-precision thin-walled annular parts are removed to complete the welding repair.

2. A tool for welding high-precision thin-walled annular parts as claimed in claim 1, characterized in that: In step S3 and step S4, the temperature detection device detects the temperature and feeds back the data to the central control system, and the central control system controls the temperature of the cooling medium temperature control system and the heating medium temperature control system to achieve temperature control of the tooling.

3. A tool for welding high-precision thin-walled annular parts as claimed in claim 1, characterized in that: In step S3, an interference fit is formed between the tooling and the high-precision thin-walled annular part, and the interference fit parameter requirement is 0.05-0.1 mm.

4. A tool for welding high-precision thin-walled annular parts as claimed in claim 1, characterized in that: In step S3, before the tooling is assembled with the high-precision thin-walled annular part, the cooling medium temperature control system is first connected to cool the tooling.

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