Clamping tool for machining thin-wall annular piece

Abstract

The utility model discloses a clamping tool for machining a thin-wall annular part. The clamping tool comprises a base and a plurality of pressing assemblies. A positioning step is arranged on the base and comprises a first placing surface and a first positioning surface perpendicular to the first placing surface; the multiple pressing assemblies are evenly arranged in the circumferential direction of the base at intervals, each pressing assembly comprises a pressing plate, each pressing plate is of a Z-shaped structure, each pressing plate comprises a fixing part, a vertical part and an axial pressing part which are sequentially connected, the fixing parts are detachably connected with the base, and the axial pressing parts are pressed on the upper end face of the annular part. One end of the pressing plate is pressed on the upper end face of the annular piece, the other end of the pressing plate is connected with the base and used for supporting the outer side wall of the annular piece and limiting displacement of the annular piece in the radial direction, the multiple pressing assemblies are combined with the base to achieve pressing of the annular piece in the axial direction, and the situation that the thin-wall annular piece shifts in the machining process is avoided. The deformation of the thin-wall annular part in the machining process is controlled, and the machining precision of the thin-wall annular part is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to annular piece machining technical field, especially a kind of clamping tool for thin-walled annular piece machining. BACKGROUND

[0002] In the annular piece machining process, annular piece is usually carried out on precision lathe, and needs to be clamped before precision turning, and for the thin-walled annular piece machining of high-strength, high-hardness material such as Ti6242, due to the size of part is larger, generally 1~2m, stress is larger in machining process, and machining deformation is difficult to control, especially for some thin-walled parts with wall thickness less than or equal to 30mm, rigidity is poor, and part is not easy to clamp, and product appearance size is easily out of the tolerance range specified in product standard under the influence of cutting force, deformation out of tolerance occurs, and part shape and position tolerance is difficult to guarantee to meet the requirements after precision turning.

[0003] The existing clamping tool is prone to thin-walled annular piece clamping deformation, and the clamping steps are very cumbersome, and the clamping efficiency is very low, so as to improve production cost, more importantly, it is difficult to meet the high-precision machining needs of the above-mentioned thin-walled annular piece, which seriously affects the quality and production efficiency of annular piece. Therefore, an urgent need exists for a clamping tool specially designed for thin-walled annular piece precision turning to solve these problems. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the problems that existing clamping tool is difficult to meet the high-precision machining needs of the above-mentioned thin-walled annular piece, and seriously affects the quality and production efficiency of annular piece, and provides a kind of clamping tool for thin-walled annular piece machining.

[0005] In order to realize the above-mentioned utility model purposes, the utility model provides the following technical schemes:

[0006] A kind of clamping tool for thin-walled annular piece machining, including base and multiple compression components;

[0007] Positioning step is provided on the base, the positioning step includes first placement surface and the first positioning surface perpendicular to the first placement surface, the first placement surface is used to place annular piece, and the first positioning surface is used to limit the position of annular piece;

[0008] Multiple compression components are uniformly spaced along the circumference of the base, and the compression component includes a pressing plate, the pressing plate is a Z-shaped structure, the pressing plate includes a fixed portion, a vertical portion and an axial compression portion connected in sequence, the fixed portion is detachably connected with the base, and the axial compression portion is pressed on the upper end surface of the annular piece.

[0009] In the technical scheme of the utility model, the tooling includes a base and multiple compression assemblies, the positioning step on the base is used for positioning the annular part, the compression assemblies are uniformly arranged in the circumferential direction on the base, the fixing part is located at the bottom of the pressing plate and is detachably connected with the base, is used for fixing the pressing plate on the base, the vertical part is connected between the fixing part and the axial compression part, is arranged vertically, the radial compression part is abutted on the circumferal surface of the inner ring or the outer ring of the annular part blank, the axial compression part is located at the top of the pressing plate, the axial compression part is compressed on the upper surface of the annular part, so that one end of the pressing plate is pressed on the upper end surface of the annular part, the other end is connected with the base, is used for supporting the outer sidewall of the annular part, limiting the displacement of the annular part in the radial direction, multiple compression assemblies and the base are combined to realize the compression of the annular part in the axial direction, avoid the displacement of the annular part in the machining process, control the deformation amount of the annular part in the machining process, and improve the machining precision of the annular part.

[0010] The tooling of the utility model can meet the high-precision machining requirement of the annular part, solve the problem that the existing clamping tooling cannot meet the high-precision machining requirement of the thin-walled annular part, seriously affect the quality and production efficiency of the annular part, ensure that the part meets the technical requirements of the drawing, ensure the quality of the produced thin-walled annular part, and further improve the production efficiency and reduce the production cost.

[0011] Further, the base is a circular ring-shaped base. The circular ring-shaped base provides stable support and accurate positioning, which can improve the precision during machining and ensure that the size and shape of the machined annular part meet the design requirements.

[0012] Further, when machining the inner profile of the annular part, the positioning step is arranged on the inner side of the base, the first positioning surface is located on the outer side of the annular part, and the compression assembly is located on the outer side of the annular part.

[0013] In the above scheme, the positioning step is arranged on the inner side of the base, that is, the annular part is placed on the first placement surface, the first positioning surface is located on the outer side of the annular part, and the compression assembly is located on the outer side of the annular part to axially compress the annular part. Through the above arrangement, when machining the inner profile of the annular part, the first positioning surface is located on the outer side of the annular part, used for supporting the outer sidewall of the annular part, limiting the displacement of the annular part in the radial direction, and the compression assembly is located on the outer side of the annular part to compress it. The tooling as a whole clamps the annular part up and down, does not form an obstruction to the machining of the inner profile of the annular part, facilitates the machining of the inner profile of the annular part, and ensures that the annular part is uniformly stressed during the compression process, ensuring the structural stability of the part to be machined during machining, effectively controlling the deformation of the part during machining, thereby effectively improving the machining precision of the annular part. According to the profile of the part to be machined, the appropriate placement mode of the part is designed, so as to control the cutting deformation amount in the machining process.

[0014] Further, the outer diameter of the first placement surface is 0.5-2.5mm larger than the outer diameter of the ring-shaped part.

[0015] Further, the positioning step is arranged on the outer side of the base, the first positioning surface is arranged on the inner side of the ring-shaped part, and the pressing assembly is arranged on the inner side of the ring-shaped part.

[0016] In the above scheme, the positioning step is arranged on the outer side of the base, the first positioning surface is arranged on the inner side of the ring-shaped part, and the pressing assembly is arranged on the inner side of the ring-shaped part to axially press the ring-shaped part. Through the above arrangement, when the outer profile of the ring-shaped part is machined, the first positioning surface is arranged on the inner side of the ring-shaped part to support the inner side wall of the ring-shaped part and limit the displacement of the ring-shaped part in the radial direction. The pressing assembly is arranged on the inner side of the ring-shaped part to press, and the whole tool clamps the ring-shaped part up and down, so that the machining of the outer profile of the ring-shaped part is not blocked, the machining of the outer profile of the ring-shaped part is facilitated, the ring-shaped part can be uniformly stressed during the pressing process, the structural stability of the part to be machined during machining is ensured, the deformation of the part during machining is effectively controlled, and the machining precision of the ring-shaped part is effectively improved.

[0017] Further, the inner diameter of the first placement surface is 0.5-2.5mm smaller than the inner diameter of the ring-shaped part.

[0018] Further, the angle formed by the fixing part and the vertical part is 80-110°; preferably, the angle is 88-95°.

[0019] Further, the position where the axial pressing part contacts the ring-shaped part is provided with an elastic buffer layer made of rubber or polyurethane material or copper gasket, which is used to reduce the damage of the pressing plate to the ring-shaped part and uniformly disperse the pressure.

[0020] Further, the fixing part is provided with a through hole, and the base is provided with a connecting hole at a corresponding position, so that the fixing part and the base are detachably connected through the connecting piece penetrating through the through hole and the connecting hole.

[0021] Further, the connecting piece is a screw.

[0022] Compared with the prior art, the utility model has the advantages of:

[0023] 1. The utility model provides a clamping tool for thin-walled annular piece machining, and the tool comprises a base and a plurality of compression assemblies, a positioning step on the base is used for positioning the annular piece, the compression assemblies are uniformly arranged circumferentially on the base plate, the fixed part is located at the bottom of the pressing plate and is detachably connected with the base, is used for fixing the pressing plate on the base, the vertical part is connected between the fixed part and the axial compression part, adopts vertical arrangement, by abutting the radial compression part on the circumferential surface of the inner ring or the outer ring of the annular piece blank, the axial compression part is located at the top of the pressing plate, the axial compression part is compressed on the upper surface of the annular piece, so that one end of the pressing plate is pressed on the upper end surface of the annular piece, and the other end is connected with the base and is used for supporting the outer sidewall of the annular piece, limiting the displacement of the annular piece in the radial direction, the plurality of compression assemblies and the base are combined to realize the compression of the thin-walled annular piece in the axial direction, avoid the displacement of the annular piece in the machining process, control the deformation amount of the thin-walled annular piece in the machining process, and improve the machining precision of the thin-walled annular piece.

[0024] 2. The tool of the utility model can meet the demand of high-precision machining of the annular piece, especially the thin-walled annular piece, solves the problem that the existing clamping tool cannot meet the demand of high-precision machining of the thin-walled annular piece, seriously affects the quality and production efficiency of the annular piece, guarantees that the part meets the technical requirements of the drawing, guarantees the quality of the thin-walled annular piece produced, and further improves the production efficiency and reduces the production cost.

[0025] 3. The tool of the utility model has simple structure, convenient operation and low manufacturing cost, and can be used on small and large lathes and ordinary numerical control lathes. DRAWINGS

[0026] Figure 1 It is a cross-sectional schematic view of the thin-walled annular piece in embodiment 1.

[0027] Figure 2 It is a three-dimensional schematic view of the clamping tool installation when machining the inner profile of the annular piece in embodiment 1.

[0028] Figure 3 It is a cross-sectional schematic view of the base installation in embodiment 1.

[0029] Figure 4 It is a cross-sectional schematic view of the pressing plate in embodiment 1.

[0030] Figure 5 It is a top view of the pressing plate in embodiment 1.

[0031] Figure 6 It is a cross-sectional schematic view of the clamping tool installation when machining the inner profile of the annular piece in embodiment 1.

[0032] Figure 7 It is a three-dimensional schematic view of the clamping tool installation when machining the outer profile of the annular piece in embodiment 2.

[0033] Figure 8 Cross-sectional view of the mounting of the base in Example 2;

[0034] Figure 9 Cross-sectional view of the mounting of the clamping tool for machining the outer surface of the ring in Example 2;

[0035] Reference signs in the drawing: 1 - ring, 2 - base, 21 - first placement surface, 22 - first positioning surface, 23 - connecting hole, 3 - pressing plate, 31 - fixing part, 32 - vertical part, 33 - axial pressing part, 34 - through hole, 4 - connecting piece. DETAILED DESCRIPTION

[0036] In order to more clearly describe the utility model purpose, technical scheme and technical effect advantage of the specific implementation case of the utility model, the scheme in the specific embodiment will be described in detail below in combination with the drawings of the specification of the utility model. The specific technical scheme involved in the following specific embodiment is only for clearly and completely describing the innovative technical scheme of the utility model, and it is only a part of the specific implementation scheme that can be adopted by the utility model, not all embodiments, and should not be understood as a limitation of the innovative scheme of the utility model. Any scheme adopting the same utility model concept of the utility model should be included in the protection scope of the utility model.

[0037] Secondly, the related description of the drawings involved in the specific embodiment of the utility model is only for facilitating the understanding of the utility model scheme by the technicians, and part of the details in the drawings is exhibited for facilitating the clear presentation of the technical scheme, and all the technical features in the drawings should not be considered as necessarily included in the specific implementation case, and more, the detail features in the drawings should not be considered as an additional limitation of the innovative technical scheme of the utility model. The components in each embodiment described and exhibited in the drawings can be combined and arranged in different configurations, and all the combination and arrangement changes should be considered as a part of all the embodiments of the innovative scheme of the utility model, and should be included in the protection scope of the utility model.

[0038] In summary, the scheme or description presented in the specific embodiment and the drawings of the utility model is not intended to limit the protection scope, but only to represent the selected embodiments / cases for helping the technicians to understand the related innovative scheme. Based on these embodiments, all the other equivalent or parallel embodiments obtained by the technicians in the field without making creative efforts belong to the protection scope of the utility model.

[0039] It should be noted that, in the description of the embodiments of the present application, the terms of orientation or position relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", and the like, are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product / device / apparatus of the present application is normally used. These terms of orientation or position relationship are only for the convenience of describing the present application or simplifying the description of the embodiments, and for the convenience of the skilled person to quickly understand the scheme, and do not indicate or imply that a specific device / component / element must have a specific orientation or be constructed and operated in a specific position relationship, and therefore cannot be understood as a limitation on the present application.

[0040] In addition, the terms "horizontal", "vertical", "suspended", and the like do not mean that the corresponding device / component / element must be absolutely horizontal or vertical or suspended, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Alternatively, it can be simplified to understand that the corresponding device / component / element is set in a specific direction such as "horizontal", "vertical", "suspended", etc., and can have an error / bias of ±10% relative to the corresponding direction, more preferably an error / bias of ±8% or less, more preferably an error / bias of ±6% or less, more preferably an error / bias of ±5% or less, and more preferably an error / bias of ±4% or less. As long as the corresponding device / component / element is within the error / bias range, it can still achieve its role in the present application scheme.

[0041] In addition, the terms "first", "second", "third", and the like in the terms are only used to distinguish the same or similar components for description, and should not be understood as emphasizing or implying the relative importance of the specific components.

[0042] In addition, in the description of the embodiments of the present application, "several", "a plurality of", and "several" represent at least 2. It can be 3, 4, 5, 6, 7, 8, 9, etc. in any case, or even more than 9.

[0043] In addition, in the description of the technical scheme of the present application, unless otherwise specified / limited / limited, the terms "set", "install", "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, such as welding, riveting, bolting, screwing, etc. The connection means commonly used in the art. Such connection can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium; it can be the communication between two elements.

[0044] Example 1

[0045] like Figure 1 As shown, the Ti6242 thin-walled ring part has a large diameter (φ1120±0.5). During machining, the ring part 1 experiences significant stress, making machining deformation difficult to control. Its thin wall thickness of 12mm results in poor rigidity and makes clamping difficult. During machining, the cutting force easily causes the product's dimensions to exceed the tolerance range specified in the product standard, leading to deformation exceeding tolerances. Furthermore, the part's form and position tolerances are stringent: flatness ≤0.2mm, parallelism ≤0.2mm, cylindricity ≤0.2mm, and coaxiality ≤0.2mm. Using existing clamping fixtures for precision machining makes it difficult to guarantee these requirements.

[0046] Based on the structural characteristics of the parts, this embodiment proposes a new clamping fixture, including a base 2 and multiple clamping components; the base 2 is provided with a positioning step, the positioning step includes a first placement surface 21 and a first positioning surface 22 perpendicular to the first placement surface 21, the first placement surface 21 is used to place the annular part 1, and the first positioning surface 22 is used to define the position of the annular part 1; multiple clamping components are evenly spaced along the circumference of the base 2, the clamping components include a pressure plate 3, the pressure plate 3 has a Z-shaped structure, the pressure plate 3 includes a fixing part 31, a vertical part 32, and an axial clamping part 33 connected in sequence, the fixing part 31 is detachably connected to the base 2, and the top of the annular part (1) is the upper end surface of the annular part.

[0047] The base 2 is a circular annular base 2, with a width of 150mm and a height of 65mm. The circular annular base 2 can provide stable support and precise positioning for the thin-walled annular part 1. The tooling provided in this embodiment is used for clamping when machining the inner surface of the annular part 1, such as... Figure 2 As shown, the positioning step is located on the inner side of the base 2, the first positioning surface 22 is located on the outer side of the annular part 1, and the clamping assembly is located on the outer side of the annular part 1, as shown. Figure 3 The first placement surface 21 is annular with a width of 10mm and is located at a height of 45mm from the base 2. The outer diameter of the first placement surface 21 is 0.5 to 2.5mm larger than the outer diameter of the annular part 1. The specific dimensions of the first placement surface 21 and the second positioning surface are adjusted according to the annular part 1 so that they contact the bottom of the annular part 1 and provide support. It should be noted that since the first placement surface 21 is annular, the inner diameter of the first placement surface 21 refers to the diameter of the inner circle in the annular ring, and the outer diameter of the first placement surface 21 refers to the diameter of the outer circle in the annular ring.

[0048] Based on the dimensions of the Ti 6242 thin-walled annular component, design appropriate pressure plates and their quantity, specifically, as follows: Figure 4 , Figure 5As shown, the pressure plate 3 is 120mm long, 50mm wide, and 210mm high. The pressure plate 3 includes a fixing part 31, a vertical part 32, and an axial pressing part 33 connected in sequence. The fixing part 31 is detachably connected to the base 2. The fixing part 31 has a through hole 34, which is a countersunk hole. The base 2 has a corresponding connecting hole 23. A connector 4 passes through the through hole 34 and the connecting hole 23 to achieve a detachable connection between the fixing part 31 and the base 2. In this embodiment, the connector 4 is an internal hexagon head screw. The vertical part 32 is vertically positioned and connected between the fixing part 31 and the axial pressing part 33. The angle formed between the fixing part 31 and the vertical part 32 is 80° to 110°. In this embodiment, the vertical part 32 is perpendicular to the fixing part 31 and the axial pressing part 33. The axial pressing part 33 presses against the upper surface of the annular part 1.

[0049] In some embodiments, an elastic buffer layer is provided at the position where the axial pressing part 33 contacts the annular part 1. The elastic buffer layer is made of rubber, polyurethane material or copper gasket, and is used to reduce the damage of the pressure plate 3 to the annular part 1 and to evenly distribute the pressure.

[0050] When machining the inner surface of the annular part, the first positioning surface 22 is located on the outer side of the annular part 1, and is used to support the outer wall of the annular part 1, such as... Figure 6 The clamping assembly restricts the radial displacement of the ring part 1. The clamping assembly is located on the outside of the ring part 1 and clamps it. The entire fixture clamps the ring part 1 from top to bottom, which does not obstruct the machining of the inner surface of the ring part 1. This facilitates the machining of the inner surface of the ring part 1. During the clamping process, the thin-walled ring part can be evenly stressed, ensuring the structural stability of the part to be machined during machining and effectively controlling the deformation of the part during machining, thereby effectively improving the machining accuracy of the thin-walled ring part.

[0051] The tooling installation process is as follows: place the base 2 horizontally, place the annular part 1 on the base 2 through the positioning step, then press the axial clamping part 33 of the pressure plate 3 onto the upper end face of the annular part 1, and then fix the fixing part 31 and the base 2 with internal hexagonal head screws.

[0052] Example 2

[0053] This embodiment provides a clamping fixture for machining thin-walled annular parts, similar to Embodiment 1, except that the fixture is used for clamping the outer surface of the annular part during machining. Figure 7 As shown, the positioning step is located on the outer side of the base 2, the first positioning surface 22 is located on the inner side of the annular part 1, and the clamping assembly is located on the inner side of the annular part 1, as shown. Figure 8 .

[0054] A positioning step is provided on the outer side of the base 2, that is, on the first placement surface 21, on which the annular part 1 is placed. The first positioning surface 22 is located on the inner side of the annular part 1. The clamping assembly is located on the inner side of the annular part 1 to axially clamp the annular part 1, such as... Figure 9 With the above settings, when machining the outer surface of the ring part 1, the first positioning surface 22 is located on the inner side of the ring part 1 to support the inner wall of the ring part 1 and limit the radial displacement of the ring part 1. The clamping assembly is located on the inner side of the ring part 1 to clamp it. The tooling as a whole clamps the ring part 1 from top to bottom, which will not obstruct the machining of the outer surface of the ring part 1, making it easier to machine the outer surface of the ring part 1. In addition, the thin-walled ring part can be evenly stressed during the clamping process, ensuring the structural stability of the part to be machined during the machining process, effectively controlling the deformation of the part during the machining process, thereby effectively improving the machining accuracy of the thin-walled ring part.

[0055] In terms of machining, drawing on past experience in machining parts, a machining process route for the titanium alloy thin-walled ring part 1 was developed. The process route is as follows: blank inspection → turning the datum surface and rough turning the inner diameter → turning the other end and rough turning the outer diameter → using the tooling of Example 1 to clamp the part and finish turning the inner diameter → using the tooling of Example 2 to clamp the part and finish turning the outer diameter → inspection. After the part is machined, the dimensions of the part are checked with relevant measuring tools and all meet the design requirements.

[0056] For those skilled in the art, when understanding the solutions described in the specific embodiments of this utility model, conventional technical manuals in the field can be consulted. At the same time, appropriate understandings or adjustments can be made to the places where the above terms appear, so as to deduce the same or similar technical solutions without creative effort.

[0057] The above embodiments describe only the basic principles, main features and / or advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The above embodiments and the utility model content section of the specification describe only the principles or specific cases of this utility model. Without departing from the essence of the innovative idea of ​​this utility model, there are various changes and improvements to the innovative solution of this utility model, and these changes and improvements all fall within the scope of protection claimed by this utility model.

Claims

1. A clamping fixture for machining thin-walled ring-shaped parts, comprising a base (2) and multiple clamping assemblies; characterized in that, The base (2) is provided with a positioning step, which includes a first placement surface (21) and a first positioning surface (22) perpendicular to the first placement surface (21). The first placement surface (21) is used to place the ring part (1), and the first positioning surface (22) is used to define the position of the ring part (1). Multiple clamping components are evenly spaced along the circumference of the base (2). Each clamping component includes a pressure plate (3), which has a Z-shaped structure. The pressure plate (3) includes a fixing part (31), a vertical part (32), and an axial clamping part (33) connected in sequence. The fixing part (31) is detachably connected to the base (2), and the axial clamping part (33) presses on the upper end surface of the annular part (1).

2. The clamping fixture for machining thin-walled ring-shaped parts according to claim 1, characterized in that, The base (2) is a circular base (2).

3. The clamping fixture for machining thin-walled ring-shaped parts according to claim 2, characterized in that, When used to process the inner surface of the ring part (1), the positioning step is set on the inner side of the base (2), the first positioning surface (22) is located on the outer side of the ring part (1), and the clamping assembly is located on the outer side of the ring part (1).

4. A clamping fixture for machining thin-walled ring-shaped parts according to claim 3, characterized in that, The outer diameter of the first placement surface (21) is 0.5 to 2.5 mm larger than the outer diameter of the annular part (1).

5. A clamping fixture for machining thin-walled ring-shaped parts according to claim 2, characterized in that, When processing the outer surface of the ring part (1), the positioning step is set on the outside of the base (2), the first positioning surface (22) is located on the inside of the ring part (1), and the clamping assembly is located on the inside of the ring part (1).

6. A clamping fixture for machining thin-walled ring-shaped parts according to claim 5, characterized in that, The inner diameter of the first placement surface (21) is 0.5 to 2.5 mm smaller than the inner diameter of the annular part (1).

7. A clamping fixture for machining thin-walled ring-shaped parts according to any one of claims 1-6, characterized in that, The angle between the fixing part (31) and the vertical part (32) is 80 to 110°.

8. A clamping fixture for machining thin-walled ring-shaped parts according to any one of claims 1-6, characterized in that, An elastic buffer layer is provided at the position where the axial pressing part (33) contacts the annular part (1) to reduce the damage of the pressure plate (3) to the annular part (1) and to evenly distribute the pressure.

9. A clamping fixture for machining thin-walled ring-shaped parts according to any one of claims 1-6, characterized in that, The fixing part (31) is provided with a through hole (34), and the base (2) is provided with a connecting hole (23) at the corresponding position. The connecting piece (4) passes through the through hole (34) and the connecting hole (23).

10. A clamping fixture for machining thin-walled ring-shaped parts according to claim 9, characterized in that, The connector (4) is a screw.

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