Flexible tensioning method for thin-walled profiled annular elements

Abstract

The flexible tensioning method for thin-walled irregular ring parts of the present invention includes: a base (1) installed on a machine tool platform; a first limiting partition (9) of the outer ring and a second limiting partition (10) of the inner ring respectively installed at the open end of the part; the outer ring inflation nozzle (6) and the inner ring inflation nozzle (12) are removed through corresponding air inlets, and the first limiting partition (9) and the second limiting partition (10) are fixed; the second flexible nylon airbag (13) is inflated, causing the inner ring to deform within a preset range, and then the first flexible nylon airbag (5) is inflated, causing the outer ring to deform within a preset range, and the concentricity of the outer ring and the inner ring after deformation meets a preset value; the outer ring and the inner ring are machined by a lathe. It can adapt to the tensioning of various irregular structures, making the machining rigidity of the part better.

Description

Technical Field

[0001] This invention relates to the technical field of flame tube assembly processing technology, and in particular to a flexible tensioning method for thin-walled irregularly shaped annular parts. Background Technology

[0002] Existing tensioning methods involve using specialized mechanical conical tensioning fixtures to constrain parts or filling cavities with low-melting-point materials for tensioning (which carries the risk of foreign matter). However, for complex, irregularly shaped, thin-walled annular parts, existing processing methods cannot meet the constraint tensioning control requirements, resulting in reduced processing efficiency. Summary of the Invention

[0003] In view of this, the flexible tensioning method for thin-walled irregular ring parts provided by the present invention solves the technical problem of low processing efficiency of existing methods.

[0004] A flexible tensioning method for a thin-walled irregularly shaped annular part is disclosed, applicable to the thin-walled irregularly shaped annular part as a component and processed by a machine tool. The component includes inner and outer rings and an outer ring with an open structure at one end. The other end has multiple mounting holes spaced apart, and multiple air inlets are respectively provided on the side. The method is characterized by comprising...

[0005] S101: The part is mounted on the base with its open end facing upwards and is calibrated. The base is mounted on the platform of the machine tool.

[0006] S102: The first limiting partition of the outer ring and the second limiting partition of the inner ring are respectively installed at the open end of the part, and a gap is left respectively. The gap formed between the inner wall surface of the outer ring and the side of the first limiting partition is used as the first gap, and the gap formed between the outer wall surface of the inner ring and the side of the second partition is used as the second gap.

[0007] S103: A first flexible nylon airbag with an outer ring inflation nozzle is installed in the first gap, and a second flexible nylon airbag with an inner ring inflation nozzle is installed in the second gap. The outer ring inflation nozzle and the inner ring inflation nozzle are taken out through the corresponding air inlet, and the first limiting partition and the second limiting partition are fixed.

[0008] S104: The second flexible nylon airbag is inflated, causing the inner ring to deform within a preset range. Then, the first flexible nylon airbag is inflated, causing the outer ring to deform within a preset range. The concentricity of the outer ring and the inner ring after deformation satisfies a preset value.

[0009] S105; The outer ring and the inner ring are machined separately using a lathe.

[0010] Beneficial effects

[0011] The use of two airbags solves the problem of deformation during processing of flame tube components due to their irregular structure and the inability to directly constrain and control the surface. The method of this invention enables high-precision dimensional processing of irregularly shaped annular parts of thin-walled flame tube components, can adapt to the tension of various irregular structures, improves the processing rigidity of parts, significantly reduces processing deformation, and increases processing efficiency. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a flowchart of the method of the present invention;

[0014] Figure 2 This is a schematic diagram of the assembly. Detailed Implementation

[0015] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0016] The following specific examples illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. This disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this disclosure. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0017] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this disclosure, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using other structures and / or functionalities besides one or more of the aspects set forth herein.

[0018] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this disclosure. The drawings only show the components related to this disclosure and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0019] Furthermore, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that these aspects can be practiced without these specific details.

[0020] See Figures 1 to 2 The method for flexibly tensioning a thin-walled irregular ring-shaped part is applicable to thin-walled irregular ring-shaped parts used as components and processed by machine tools. The part includes inner and outer rings and has an open structure at one end, with multiple mounting holes spaced apart at the other end, and multiple air inlets on the side. The method includes:

[0021] S101: The part is mounted on base 1 with its open end facing upwards and is calibrated. Base 1 is mounted on the machine tool platform. Specifically:

[0022] A positioning sleeve 2 is provided on the base 1 at a position corresponding to the mounting hole. The mounting hole is fitted onto or nested within the positioning sleeve 2, and a pressure block 3 is used to fix the part. The pressure block 3 is installed on the positioning sleeve 2 using bolts to complete the initial positioning of the part. Calibration is performed using a dial indicator until the concentricity of the outer and inner rings is no greater than a first value and the concentricity of the outer circle with the outer circle of the base 1 is no greater than a second value. Then, the bolts are tightened to fix the part on the base. That is, at any point on the inner and outer ring surfaces, the runout between the two points is no greater than the first value. Figure 2 As shown, when the runout at points B and D on the end face is no greater than the second value, tighten the bolts to fix the part on the base.

[0023] Furthermore, the first value is 0.1mm and the second value is 0.05mm. Preferably, the shape of the pressure block 3 is a small cylinder with a countersunk head and a hole in the middle. The pressure block 3 acts on the top of the part and is screwed into the base 1 through the screw 4 with an internal hexagonal screw on the head to press the part. In addition, the height of the mounting hole is higher than the height of the positioning sleeve 2. The positioning sleeve 2 acts on the bottom plane of the part to provide support and can initially position the part.

[0024] Furthermore, a first groove and a second groove (not shown in the figure) are provided at intervals on the top surface of the pressure block 3. Both are arc grooves. The first groove and the second groove are used to fix one end of the first limiting partition 9 and the second limiting partition 10, respectively.

[0025] S102: The first limiting partition 9 of the outer ring and the second limiting partition 10 of the inner ring are respectively installed at the open end of the part, and gaps are left respectively. The gap formed between the inner wall surface of the outer ring and the side of the first limiting partition 9 is used as the first gap, and the gap formed between the outer wall surface of the inner ring and the side of the second partition 10 is used as the second gap.

[0026] S103: A first flexible nylon airbag 5 with an outer ring inflation nozzle 6 is installed in the first gap, and a second flexible nylon airbag 13 with an inner ring inflation nozzle 12 is installed in the second gap. The outer ring inflation nozzle 6 and the inner ring inflation nozzle 12 are removed through the corresponding air inlets, and the first limiting partition 9 and the second limiting partition 10 are fixed. Specifically:

[0027] Fixing the first limiting partition 9 and the second limiting partition 10 includes: setting a third groove and a fourth groove on the bottom surface of the cover 8, the third groove and the fourth groove being used for fixing the other end of the first limiting partition 9 and the second limiting partition 10 respectively;

[0028] The cover 8 has pin holes around its circumference. A locating pin is used to secure the cover 8 by passing through the air inlet and inserting it into the pin hole. For example, a locating pin... Figure 2 The first positioning pin 7 and the second positioning pin 11 fix the cover 8.

[0029] S104: The second flexible nylon airbag 13 is inflated, causing the inner ring to deform within a preset range. Then, the first flexible nylon airbag 5 is inflated, causing the outer ring to deform within a preset range. The concentricity of the outer and inner rings after deformation meets a preset value. Specifically:

[0030] Nitrogen gas is introduced into the second flexible nylon airbag 13 through the inner ring inflation nozzle 12 until the diameter deformation of the inner ring is within the first theoretical diameter range (the first and second theoretical diameter ranges are determined according to the flame tube repair specifications). It is then determined whether the concentricity of the four symmetrical points on the outer circle of the inner ring and the outer circle of the base 1 is greater than 0.05 mm (see...). Figure 2As shown, if the gauge reading at point A is no greater than 0.05mm, adjust the nitrogen pressure input to the second flexible nylon airbag 13, while ensuring that the inner ring diameter deformation is within the first theoretical diameter range, until the concentricity of the four symmetrical points of the outer circle of the inner ring and the outer circle of the base 1 is no greater than 0.1mm. If not, stop inputting nitrogen into the second flexible nylon airbag 13. Then, input nitrogen into the first flexible nylon airbag 5 through the outer ring inflation nozzle 6 until the outer ring diameter deformation is within the second theoretical diameter range, and determine whether the concentricity of the four symmetrical points of the outer ring and the outer circle of the base 1 is greater than 0.2mm (gauge reading at point C is no greater than 0.2mm). If yes, adjust the nitrogen pressure input to the first flexible nylon airbag 5, while ensuring that the outer ring diameter deformation is within the first theoretical diameter range, until the concentricity of the four symmetrical points of the outer ring and the outer circle of the base 1 is no greater than 0.2mm. If not, stop inputting nitrogen into the first flexible nylon airbag 5.

[0031] The purpose of the secondary 0.2 concentricity test on the inner and outer rings is to ensure that the inner and outer rings can be rounded under the inflation and tension of the airbag, reducing the runout of the outer circle and ensuring design requirements. Simultaneously, machining under this tensioned and rounded state ensures more uniform wall thickness for the inner and outer rings, resulting in more stable structural strength and preventing stress concentration caused by uneven wall thickness. For example, if the inner and outer ring diameters have been tightened to the required diameter difference, uneven deformation of the parts may prevent the 0.2 concentricity requirement from being met. In this case, the inner and outer rings are machined at four symmetrical points on their outer circles (the centers of the major and minor axes of the ellipse). During processing under tension, the inner and outer rings are stretched and deformed to the required outer diameter value by the action of the second flexible nylon airbag 13 and the first flexible nylon airbag 5, ensuring the uniformity of the wall thickness of the processed part, improving the machinability of thin-walled parts, and resulting in a better diameter state of the processed part. Furthermore, under the action of the two airbags and the cover 8, they are connected into a whole, increasing the natural frequency of the part itself, reducing tool chatter during processing, reducing tool chipping, improving processing efficiency, and resulting in a better surface roughness of the processed part. Therefore, the method of the present invention can be understood as flexible processing (distinct from the traditional rigid processing method), which is suitable for processing parts under different deformations and has stronger adaptability. The deformation is controlled to the specified diameter value by changing the air pressure through the airbags.

[0032] S105; The outer and inner rings are machined separately using a lathe. The base 1 is placed on the machine tool platform, and machining instructions are input into the CNC program to complete the machining.

[0033] The method of this invention utilizes independent flexible tensioning devices for the inner and outer rings, which can adapt to complex working conditions with different deformations of the inner and outer rings, exhibiting strong adaptability. These independent tensioning devices can adjust the air pressure of the inner and outer ring tensioning airbags as needed, ensuring that the initial diameter of the inner and outer rings during machining is within the acceptable range. Stable air pressure ensures the consistency of the diameter dimensions of the machined parts under constraint. By simply introducing gas into the two airbags to reach a certain pressure and simultaneously detecting the actual diameter values ​​of the inner and outer rings, the tensioning of complex cavity parts with inner and outer rings can be quickly achieved. After tensioning, the structural rigidity of the part is improved, reducing tool vibration. Furthermore, it allows for independent and rapid, precise constraint tensioning of the complex inner and outer ring structures of thin-walled, irregularly shaped flame tube assemblies, improving the structural rigidity of the part, reducing tool vibration, and increasing machining efficiency by approximately 30%.

[0034] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A method for flexibly tensioning a thin-walled irregularly shaped annular part, applicable to the thin-walled irregularly shaped annular part as a component and processed by a machine tool, the component comprising an inner ring and an outer ring with an open structure at one end, and multiple mounting holes spaced apart at the other end, and multiple air inlets respectively provided on the side, characterized in that, The method includes, S101: The part is mounted on the base (1) with the open end facing upward and is calibrated. The base (1) is mounted on the platform of the machine tool. A positioning sleeve (2) is provided on the base (1) at the position corresponding to the mounting hole. The mounting hole is fitted on the positioning sleeve (2) or nested in the positioning sleeve (2). The part is fixed by a pressure block (3). The pressure block (3) is installed on the positioning sleeve (2) with bolts to complete the initial positioning of the part. The part is calibrated by a dial indicator until the concentricity of the four symmetrical points of the inner ring and the outer circle of the base (1) is not greater than the first value. When any point is taken on the inner ring surface and the outer ring surface, and the runout of the two points is not greater than the second value, the bolts are tightened to complete the fixing of the part on the base. S102: The first limiting partition (9) of the outer ring and the second limiting partition (10) of the inner ring are respectively installed at the open end of the part, and gaps are left respectively. The gap formed between the inner wall surface of the outer ring and the side of the first limiting partition (9) is used as the first gap, and the gap formed between the outer wall surface of the inner ring and the side of the second limiting partition (10) is used as the second gap. S103: A first flexible nylon airbag (5) with an outer ring inflation nozzle (6) is installed in the first gap, and a second flexible nylon airbag (13) with an inner ring inflation nozzle (12) is installed in the second gap. The outer ring inflation nozzle (6) and the inner ring inflation nozzle (12) are taken out through the corresponding air inlet holes, and the first limiting partition (9) and the second limiting partition (10) are fixed. The first groove and the second groove are provided at intervals on the top surface of the pressure block (3). The first groove and the second groove are respectively used to fix one end of the first limiting partition (9) and the second limiting partition (10). S104: The second flexible nylon airbag (13) is inflated, causing the inner ring to deform within a preset range. Then the first flexible nylon airbag (5) is inflated, causing the outer ring to deform within a preset range. The concentricity of the outer ring and the inner ring after deformation satisfies a preset value. S105; The outer ring and the inner ring are machined separately using a lathe.

2. The method according to claim 1, characterized in that, The first value is 0.1 mm, and the second value is 0.05 mm.

3. The method according to claim 1, characterized in that, S103 includes fixing the first limiting partition (9) and the second limiting partition (10) as follows: A third groove and a fourth groove are provided on the bottom surface of the cover (8), and the third groove and the fourth groove are respectively used to fix the other end of the first limiting partition (9) and the second limiting partition (10); A pin hole is provided around the circumference of the cover (8). A positioning pin is used to pass through the air inlet and insert into the pin hole to fix the cover (8).

4. The method of claim 3, wherein, The methods in S104 include: Nitrogen gas is introduced into the second flexible nylon airbag (13) through the inner ring inflation nozzle (12) until the diameter of the inner ring is deformed within the first theoretical diameter range. It is then determined whether the concentricity of the four symmetrical points of the outer circle of the inner ring and the outer circle of the base (1) is greater than 0.05 mm. If so, the nitrogen gas introduced into the second flexible nylon airbag (13) is adjusted in pressure, while ensuring that the diameter of the inner ring is deformed within the first theoretical diameter range, until the concentricity of the four symmetrical points of the outer circle of the inner ring and the outer circle of the base (1) is not greater than 0.1 mm. If not, the nitrogen gas is introduced into the second flexible nylon airbag (13) is stopped. Nitrogen gas is introduced into the first flexible nylon airbag (5) through the outer ring inflation nozzle (6) until the diameter of the outer ring is deformed within the second theoretical diameter range. It is then determined whether the concentricity of the four symmetrical points of the outer ring and the outer circle of the base (1) is greater than 0.2 mm. If so, the nitrogen gas introduced into the first flexible nylon airbag (5) is adjusted in pressure, while ensuring that the diameter of the outer ring is deformed within the first theoretical diameter range, until the concentricity of the four symmetrical points of the outer ring and the outer circle of the base (1) is not greater than 0.2 mm. If not, the nitrogen gas is introduced into the first flexible nylon airbag (5) is stopped.

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