A method for non-rigid fixation of thin-walled ring-shaped parts and a machining method

Abstract

The present invention relates to a method for non-rigid fixation of thin-walled ring-shaped parts and a processing method, comprising the following steps: S1. Set up a perfusion fixture, which includes a chassis and a connection plate arranged on the chassis; S2. Place the thin-walled ring-shaped part on the chassis and sleeved outside the connection plate, with a gap between the thin-walled ring-shaped part and the connection plate; S3. Pour molten adhesive mixed wax between the thin-walled ring-shaped part and the connection plate. The adhesive mixed wax includes industrial yellow wax and industrial white wax, and the mass ratio of industrial yellow wax to industrial white wax is 3.5 / 6.5 to 4 / 6. Both industrial yellow wax and industrial white wax adopt wax of specification No. 62 to No. 70 according to the industrial wax standard GB / T446; S4. Wait for the adhesive mixed wax to solidify, and fixedly connect the thin-walled ring-shaped part and the connection plate. The present invention provides a new connection method, which uses the adhesive mixed wax to fixedly connect the thin-walled ring-shaped part to the connection plate, realizes a non-rigid connection method, and avoids deformation of the thin-walled ring-shaped part.

Description

Technical Field

[0001] The invention relates to the technical field of parts processing and clamping, and in particular to a non-rigid fixing method and a processing method for thin-walled ring parts. Background Art

[0002] In mechanical processing, when processing thin-walled ring parts, part deformation has always troubled most technicians. During the clamping process, when the existing clamps clamp thin-walled ring parts, deformation problems are easy to occur, especially the stator assembly 1 of the thin-walled ring parts of the aircraft engine, including the thin-walled body 11 and the blade 12, see Figure 1 The thickness of the thin-walled body 11 is very small, and a blade-shaped hole is provided in the thin-walled body 11 for installing the blades 12. Since 40 blade-shaped holes are processed on the thin-walled body 11, the rigidity is greatly reduced compared with other similar ring parts, the stress distribution is extremely irregular, and rigid clamping will cause irreversible deformation to the parts. Summary of the invention

[0003] In view of the shortcomings of the prior art mentioned above, the technical problem to be solved by the present invention is to provide a non-rigid fixing method and a processing method for thin-walled ring parts, which can avoid deformation of the thin-walled ring parts while fixing the thin-walled ring parts, and solve the problem that thin-walled ring parts are prone to plastic deformation during processing.

[0004] To achieve the above object, the present invention provides a non-rigid fixing method for thin-walled ring parts, comprising the following steps:

[0005] S1. Setting a pouring fixture, wherein the pouring fixture comprises a chassis and a connecting plate arranged on the chassis;

[0006] S2. Place the thin-walled ring-like parts on the chassis and put them on the outside of the connecting plate, with a gap between the thin-walled ring-like parts and the connecting plate;

[0007] S3. Pour the melted adhesive mixed wax between the thin-walled ring parts and the connecting plate, wherein the adhesive mixed wax includes industrial yellow wax and industrial white wax, and the mass ratio of the industrial yellow wax to the industrial white wax is 3.5 / 6.5 to 4 / 6, wherein the industrial yellow wax and the industrial white wax are both waxes of specifications No. 62 to No. 70 of the industrial wax standard GB / T 446;

[0008] S4. After the bonding mixed wax solidifies, the thin-walled ring parts are fixedly connected to the connecting plate.

[0009] Furthermore, the thin-walled ring-like parts are thin-walled discs or stator-like parts, including a thin-walled body and blades. In the step S2, the blades are tied and fixed to the thin-walled body using binding ropes.

[0010] Furthermore, in step S1, the pouring fixture also includes a positioning pin, a first positioning hole is provided in the chassis, the positioning pin is installed in the first positioning hole, a second positioning hole is provided in the center of the connecting disk, and the second positioning hole is installed on the positioning pin when the connecting disk is set on the chassis.

[0011] Furthermore, in step S1, the casting fixture also includes a limiting structure, which is arranged on the connecting disk and is used to limit the relative position of the thin-walled ring-like parts and the connecting disk in the circumferential direction. Step S2 also includes: using the limiting structure to fix the thin-walled ring-like parts and the connecting disk in the circumferential direction.

[0012] Furthermore, in step S3, the mass ratio of industrial yellow wax to industrial white wax in the bonding mixed wax is 4:6.

[0013] The present invention also provides a method for processing thin-walled ring parts, comprising the following steps:

[0014] A1. Use the above-mentioned non-rigid fixing method to fix the thin-walled ring parts on the connecting plate;

[0015] A2. Remove the connecting plate, send the connecting plate and the thin-walled ring parts to the processing together, and fix the thin-walled ring parts in place by fixing the connecting plate;

[0016] A3. After processing is completed, melt and remove the adhesive mixed wax between the connecting plate and the thin-walled ring parts, and remove the thin-walled ring parts.

[0017] Furthermore, the step A3 includes: A31, placing the connecting plate and the thin-walled ring parts together on a shelf with a collecting container at the bottom, heating them in a heating container, and the melted adhesive mixed wax falls into the collecting container, and is put into step S3 in the non-rigid fixing method for reuse.

[0018] Furthermore, the step A3 also includes: A32, taking out the thin-walled ring parts, and then putting them into aviation lubricating oil at 170-190° C., and the aviation lubricating oil adopts the HH-20 model in the standard GB / T440.

[0019] Furthermore, in step A31, the heating temperature of the heating container is 150-180°C.

[0020] As described above, the non-rigid fixing method and processing method of the present invention have the following beneficial effects:

[0021] 1. A new connection method is provided, which uses adhesive mixed wax to fix thin-walled ring parts on the connecting plate, realizing a non-rigid connection method. It is innovative and can prevent the deformation of thin-walled ring parts while fixing them. The deformation in the processing state and the free state is small, which solves the problem of plastic deformation of thin-walled ring parts such as stator ring parts of aircraft engine compressor components during processing due to low rigidity strength.

[0022] 2. The pouring fixture has a novel design concept and a simple structure. The wax pouring and cotton rope tying operations are simple, making it easy for workers to get started and reducing labor load.

[0023] 3. It is easy to clamp and align. When the parts are transferred from the casting fixture to the processing fixture, the installation and positioning are convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the structure of the stator assembly.

[0025] Figure 2 It is a working schematic diagram of installing the stator assembly on the pouring fixture in the present invention.

[0026] Figure 3 It is a working schematic diagram of installing the stator assembly on the processing fixture in the present invention.

[0027] Component number description

[0028] 1 Stator assembly

[0029] 11 Thin-walled body

[0030] 12 blades

[0031] 2 Connection plate

[0032] 3 Chassis

[0033] 4 Locating pins

[0034] 5 Limit pin

[0035] 6 Base

[0036] 7 Centering shaft

[0037] 8 Nut

[0038] 9 Gasket DETAILED DESCRIPTION

[0039] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0040] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] The present invention provides a non-rigid fixing method for thin-walled ring parts, comprising the following steps:

[0044] S1. Set up a pouring fixture, which includes a chassis 3 and a connecting plate 2 arranged on the chassis 3; see Figure 2 In this embodiment, the thin-walled ring-like parts are explained using the stator assembly 1 as an example. The chassis 3 is a disc structure with a first positioning hole at the center. A positioning pin 4 is installed in the second positioning hole with clearance fit. The positioning pin 4 is a stepped pin shaft. The connecting disk 2 is also a disc structure with a second positioning hole at the center. When the connecting disk 2 is placed, it is installed on the positioning pin 4 through the second positioning hole with clearance fit, thereby ensuring that the connecting disk 2 is coaxial with the chassis 3 and completing the center positioning of the connecting disk 2 on the chassis 3. Preferably, the pouring fixture also includes a positioning and limiting structure, which is arranged on the connecting disk 2 and is used to limit the relative position of the thin-walled ring-like parts and the connecting disk 2 in the circumferential direction, wherein the limiting structure includes a plurality of limiting pins 5, and the limiting pins 5 are installed on the circumferential surface of the connecting disk 2. Of course, in other embodiments, the limiting structure may also have other suitable structures.

[0045] S2. Place the thin-walled ring-like parts on the chassis 3 and put them on the outside of the connecting disk 2, with a gap between the thin-walled ring-like parts and the connecting disk 2; wherein, the radius of the connecting disk 2 is determined according to the size of the thin-walled ring-like parts, ensuring that the thin-walled ring-like parts can be smoothly put on the outside of the connecting disk 2, the distance between the two is appropriate, and the coaxial center is maintained. In this embodiment, when the stator assembly 1 is fixed, since the stator assembly 1 has blades 12, in this step, the blades 12 and the thin-walled body 11 are tied and fixed with a binding rope at the same time to ensure the stability of the blades 12. The binding rope is preferably a cotton rope. The tightening force should not be too tight or too loose during the binding. If it is too tight, the parts will be greatly deformed, and if it is too loose, the binding property of the parts and the clamp will be reduced. At the same time, the limiting pin 5 of the limiting structure is extended between two adjacent blades 12 of the stator assembly 1 to limit the relative rotation of the stator assembly 11 relative to the connecting disk 2.

[0046] S3, pouring the melted adhesive mixed wax between the thin-walled ring parts and the connection plate 2, the adhesive mixed wax includes industrial yellow wax and industrial white wax, and the mass ratio of industrial yellow wax to industrial white wax is 3.5 / 6.5-4 / 6, wherein both industrial yellow wax and industrial white wax are waxes of specifications 62-70 of the industrial wax standard GB / T 446, and the adhesive mixed wax fills the gap between the thin-walled ring parts and the connection plate 2. The mass ratio of industrial yellow wax to industrial white wax is preferably 4:6, which has a good connection effect, has a suitable hardness, and reduces the deformation of thin-walled ring parts.

[0047] S4, after the bonding mixed wax solidifies, the thin-walled ring parts are fixedly connected to the connecting plate 2, so that the thin-walled ring parts are connected without rigidity. In the subsequent processing, only the thin-walled ring parts and the connecting plate 2 need to be sent to the processing together, and the thin-walled ring parts can be fixed by fixing the connecting plate 2.

[0048] The present invention also provides a method for processing thin-walled ring parts, comprising the following steps:

[0049] A1. Use the non-rigid fixing method as described above to fix the thin-walled ring-like parts on the connecting plate 2;

[0050] A2. Remove the connecting plate 2, send the connecting plate 2 and the thin-walled ring parts to the processing together, and fix the thin-walled ring parts in place by fixing the connecting plate 2. Figure 3As a preferred design, the connecting plate 2 is fixed on a processing fixture, which includes a base 6, a centering shaft 7, a nut 8 and a gasket 9. A positioning through hole is provided in the center of the base 6. The centering shaft 7 is a stepped shaft, one section of which is installed in the positioning through hole of the base 6 and is clearance-matched. Then the second positioning hole of the connecting plate 2 is installed on the centering shaft 7 and is clearance-matched to complete the center positioning. One end face of the connecting plate 2 is against the base 6, and a nut 8 is screwed on the end of the centering shaft 7. The nut 8 is pressed on the other end face of the connecting plate 2 through the gasket 9, so that the connecting plate 2 is fixed. On the machine tool, only the base 6 needs to be supported. When the thin-walled ring parts are transferred from the infusion fixture to the processing fixture, installation and positioning are convenient. After the thin-walled ring parts are fixed by adhesive mixed wax, the excess can be less than 0.5, and the processing impact has little effect on the stability of non-rigid fixation. After machining, the deformation of the thin-walled ring parts in the non-rigid clamping state and the free state is less than 0.005, which solves the problem of processing deformation.

[0051] A3. After the processing is completed, melt and remove the adhesive mixed wax between the connecting plate 2 and the thin-walled ring parts, and remove the thin-walled ring parts. Aircraft engines have very strict control over the excess of parts, and have high requirements for the wax melting process of such parts. Residues of parts are not allowed after wax melting. In this embodiment, preferably, the adhesive mixed wax is melted and removed in the following manner: place the connecting plate 2 and the thin-walled ring parts together on a shelf with a collection container at the bottom, heat them in a heating container such as an oven, adjust the oven temperature to 150-180°C, and melt the adhesive mixed wax. This temperature can ensure that the adhesive mixed wax melts without burning. The melted adhesive mixed wax falls into the collection container, and the adhesive mixed wax collected in the collection container can be reused and put into step S3 in the non-rigid fixing method. After the parts are taken out of the oven, they are placed in No. 20 aviation lubricating oil (standard: GB / T440 specification: HH-20) heated to 170-190°C by an induction cooker. Taking advantage of the characteristics of this type of oil that can dissolve industrial wax, after 5 minutes of soaking, the aviation lubricating oil has a high dissolving effect on the mixed wax at a temperature of 150°C-180°C, and has a high flash point. The parts are suspended and soaked in the aviation lubricating oil at a temperature of 150°C-180°C, thereby further removing the adhesive mixed wax remaining on the thin-walled ring parts, ensuring that the residual content of the adhesive mixed wax on the thin-walled ring parts meets the standard, and also avoiding the deformation of the parts caused by the high temperature at the bottom of the aviation lubricating oil heating container. After soaking, the thin-walled ring parts can be transferred to ultrasound for further cleaning.

[0052] The non-rigid fixing method and processing method of the present invention have the following technical effects:

[0053] 1. A new connection method is provided, which uses adhesive mixed wax to fix thin-walled ring parts on the connection plate, realizing a non-rigid connection method. It is innovative and can prevent the deformation of thin-walled ring parts while fixing them. The deformation in the processing state and the free state is small, which solves the problem of plastic deformation of thin-walled ring parts such as stator ring parts of aircraft engine compressor parts during processing due to low rigidity strength.

[0054] 2. The pouring fixture has a novel design concept and a simple structure. The wax pouring and cotton rope tying operations are simple, making it easy for workers to get started and reducing labor load.

[0055] 3. It is easy to clamp and align. When the parts are transferred from the casting fixture to the processing fixture, the installation and positioning are convenient and quick.

[0056] In summary, the present invention effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A processing method for thin-walled ring-shaped parts, characterized in that: It includes the following steps: A1. Adopt a non-rigid fixing method to fix the thin-walled ring-shaped part on the connecting plate (2). The non-rigid fixing method includes the following steps: S1. Set up a perfusion fixture, which includes a chassis (3) and a connecting plate (2) arranged on the chassis (3); S2. Place the thin-walled ring-shaped part on the chassis (3) and sleeved outside the connecting plate (2). There is a gap between the thin-walled ring-shaped part and the connecting plate (2); S3. Pour molten adhesive mixed wax between the thin-walled ring-shaped part and the connecting plate (2). The adhesive mixed wax includes industrial yellow wax and industrial white wax, and the mass ratio of industrial yellow wax to industrial white wax is 3.5 / 6.5 to 4 / 6. Among them, both industrial yellow wax and industrial white wax adopt wax of specifications 62 to 70 of industrial wax standard GB / T 446; S4. Wait for the adhesive mixed wax to solidify, and fixedly connect the thin-walled ring-shaped part and the connecting plate (2); A2. Remove the connecting plate (2), send the connecting plate (2) and the thin-walled ring-shaped part together for processing, and position and fix the thin-walled ring-shaped part by fixedly connecting the connecting plate (2); A3. After processing is completed, melt and remove the adhesive mixed wax between the connecting plate (2) and the thin-walled ring-shaped part, and remove the thin-walled ring-shaped part, including: A31. Place the connecting plate (2) and the thin-walled ring-shaped part together on a shelf with a collection container at the bottom, heat in a heating container, the melted adhesive mixed wax falls into the collection container, and is put into step S3 of the non-rigid fixing method for reuse; A32. Take out the thin-walled ring-shaped part, and then put it into aviation lubricating oil at 170 - 190 °C. The aviation lubricating oil adopts the HH-20 model in standard GB / T440.

2. The processing method according to claim 1, characterized in that: In step A31, the heating temperature of the heating container is 150 - 180 °C.

3. The processing method according to claim 1, characterized in that: The thin-walled ring-shaped part is a thin-walled disc or a stator-like part, which has blades (12). In step S2, the blades (12) are tied and fixed to the thin-walled body (11) with a binding rope.

4. The processing method according to claim 3, characterized in that: In step S1, the perfusion fixture further includes a positioning pin (4). The chassis (3) is provided with a first positioning hole, the positioning pin (4) is installed in the first positioning hole, the center of the connecting plate (2) is provided with a second positioning hole, and when the connecting plate (2) is arranged on the chassis (3), the second positioning hole is installed on the positioning pin (4).

5. The processing method according to claim 1, characterized in that: In step S1, the perfusion fixture further includes a limiting structure. The limiting structure is arranged on the connecting plate (2) and is used to limit the relative position of the thin-walled ring-shaped part and the connecting plate (2) in the circumferential direction. Step S2 further includes: circumferentially fixing the thin-walled ring-shaped part and the connecting plate (2) by using the limiting structure.

6. The processing method according to claim 1, characterized in that: In the step S3, the mass ratio of industrial yellow wax to industrial white wax in the bonding mixed wax is 4:6.

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