A coaxiality guaranteeing tool for a micro-thin-wall rotary body

Abstract

The application relates to the technical field of machining, in particular to a coaxiality guaranteeing tool for a micro thin-wall rotary body. The utility model discloses a threaded sleeve and a split type chuck body, a conical guide surface is arranged at the front end of the threaded sleeve, an inner conical thread is arranged in the inner hole of the threaded sleeve, when the threaded sleeve is screwed, the conical guide surface drives the split type chuck body to contract radially, so that the centering clamping of the thin-wall rotary body part is realized. The split type chuck body comprises a split type chuck head, the split type chuck head is composed of multiple split pieces which are equally divided along the axial direction, the outer circle of the split piece is provided with an outer conical thread matched with the inner conical thread, and the inner wall of the split piece is provided with a positioning step matched with the outer step surface of the thin-wall rotary body part. The design datum and the machining datum of the tool are strictly unified, and systematic error accumulation caused by datum conversion and non-coincidence in multiple clamping or process conversion is completely eliminated.

Description

Technical Field

[0001] This application relates to the field of machining technology, and in particular to a coaxiality assurance tooling for a miniature thin-walled rotating body. Background Technology

[0002] In the field of precision manufacturing, miniature thin-walled rotating parts have extremely stringent requirements for machining accuracy, especially coaxiality accuracy, due to their structural characteristics. These parts are widely used in critical scenarios such as aerospace, medical devices, optical instruments, and high-end sensors, where dynamic balance, fluid performance, signal transmission, or assembly accuracy are decisively affected. As downstream products iterate at an accelerated pace, the market's requirements for the precision tolerances of these parts continue to tighten, becoming one of the core challenges in the manufacturing process.

[0003] The current industry standard for machining is a multi-stage, rotating, and clamping process using general-purpose fixtures (such as three-jaw chucks). However, this method is increasingly showing significant limitations in ensuring high-precision coaxiality of miniature, thin-walled rotating parts, primarily leading to the following core quality issues:

[0004] Datum drift and cumulative error: During multiple clamping processes, the conversion or slight inconsistency of the positioning datum directly leads to the inability of the theoretical axes at both ends of the part to be precisely aligned, and the coaxiality deviation exceeds the stringent tolerance range.

[0005] Clamping disturbance and uneven stress: During secondary clamping, slight differences in clamping force distribution or residual microscopic foreign matter on the positioning surface can introduce uncontrollable stress and micro-displacement, which can damage the geometric accuracy of the machined or to-be-machined surface and affect coaxiality.

[0006] Surface damage and geometric distortion: The rigid contact method of general-purpose fixtures can easily cause scratches or local plastic deformation (indentation) on precision thin-walled surfaces, which not only destroys the surface integrity, but also changes the local geometry, negatively affecting coaxiality measurement and function.

[0007] Uncontrollable amplification of tolerance chains: Partial machining and multi-datum conversion cause complex cumulative effects of dimensional and positional errors in each process, ultimately making it difficult to effectively control critical coaxiality errors and limiting product qualification rates. Utility Model Content

[0008] This application provides a coaxiality guaranteeing fixture for a miniature thin-walled rotating body. This utility model ensures that the part error is within the tolerance range even when there are machining and clamping positioning errors.

[0009] To achieve the above and other related objectives, this utility model provides a coaxiality assurance fixture for a miniature thin-walled rotating body, including a threaded sleeve and a segmented clamping body. The front end of the threaded sleeve is provided with a tapered guide surface, and the inner hole of the threaded sleeve is provided with an internal tapered thread. When the threaded sleeve is tightened, the tapered guide surface drives the segmented clamping body to radially contract, so as to achieve centering and clamping of the thin-walled rotating body part.

[0010] In one embodiment of this utility model, the segmented clamp specifically includes a segmented chuck, which is composed of multiple segments equally divided along the axial direction. The outer circle of each segment is provided with an external tapered thread that mates with the internal tapered thread. The inner wall of each segment is provided with a positioning step that matches the outer stepped surface of the thin-walled rotating part. The multiple segments synchronously contract radially, so that the outer circle of the thin-walled rotating part fits against the positioning step, thereby achieving centering and clamping of the thin-walled rotating part.

[0011] In one embodiment of this utility model, the segmented chuck is composed of three segments equally divided along the axial direction.

[0012] In one embodiment of this utility model, the width of the gap between the lobes is 0.15±0.02mm.

[0013] In one embodiment of this utility model, the fitting clearance between the inner hole of the segmented clamp and the outer circle of the thin-walled rotating body part is 0.03-0.05mm.

[0014] In one embodiment of this utility model, the wall thickness of the segmented clamp is 5-9 mm.

[0015] In one embodiment of this utility model, both the threaded sleeve and the segmented clamp body are made of hard aluminum LY12 material.

[0016] In one embodiment of this utility model, the axial position tolerance of the positioning step relative to the end face of the segmented clamp is ≤0.01mm.

[0017] In one embodiment of this utility model, the step surface runout of the positioning step is ≤0.005mm.

[0018] In one embodiment of this utility model, the axial length of the petal is 40-50 mm.

[0019] As described above, the coaxiality assurance fixture for a miniature thin-walled rotating body according to this utility model has the following beneficial effects:

[0020] (1) The coaxiality guarantee tooling of a miniature thin-walled rotating body of the present invention includes a threaded sleeve and a split clamping body. The design datum and processing datum of the tooling of the present invention are strictly unified, which completely eliminates the systematic error accumulation caused by datum conversion and datum non-overlap during multiple clamping or process conversion.

[0021] (2) The coaxiality guarantee tooling of the miniature thin-walled rotary body of this utility model is planned around a unique and stable reference, which minimizes the impact of reference transmission error on the final coaxiality accuracy and significantly improves the predictability and accuracy limit of the processing process.

[0022] (3) The coaxiality guarantee fixture for a miniature thin-walled rotating body of this utility model prioritizes long-term dimensional stability in its design, ensuring excellent accuracy in the positioning of each clamping and each batch of parts. The machining accuracy of the parts can remain highly consistent across different batches, significantly improving the dimensional stability and overall pass rate of the products. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the thin-walled rotating body part structure of a tooling for ensuring the coaxiality of a miniature thin-walled rotating body according to the present invention.

[0024] Figure 2 This is a schematic diagram of the coaxiality assurance tooling for a miniature thin-walled rotating body according to the present invention.

[0025] Component designation explanation

[0026] 1-Split clamp body, 2-Threaded sleeve, 3-External tapered thread, 4-Split chuck, 5-Positioning step. Detailed Implementation

[0027] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. It should be noted that, unless otherwise specified, the following embodiments and features described therein can be combined with each other.

[0028] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show the components related to the present invention 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.

[0029] Please see Figure 1 , Figure 2 , Figure 1 This is a schematic diagram of the thin-walled rotating body part structure of a tooling for ensuring the coaxiality of a miniature thin-walled rotating body according to the present invention. Figure 2 This is a schematic diagram of the coaxiality assurance fixture for a miniature thin-walled rotating body according to the present invention. The present invention provides a coaxiality assurance fixture for a miniature thin-walled rotating body, including a threaded sleeve 2 and a segmented clamping body 1. The front end of the threaded sleeve 2 is provided with a tapered guide surface, and the inner hole of the threaded sleeve 2 is provided with an internal tapered thread. When the threaded sleeve 2 is tightened, the tapered guide surface drives the segmented clamping body 1 to radially contract, thereby achieving centering and clamping of the thin-walled rotating body part.

[0030] Specifically, the segmented clamping body 1 includes a segmented chuck 4, which is composed of multiple segments equally divided along the axial direction. The outer circle of each segment is provided with an external tapered thread 3 that mates with the internal tapered thread. The inner wall of each segment is provided with a positioning step 5 that matches the outer stepped surface of the thin-walled rotating part. The multiple segments synchronously contract radially, so that the outer circle of the thin-walled rotating part fits against the positioning step 5, thereby achieving centering and clamping of the thin-walled rotating part.

[0031] Specifically, the segmented chuck 4 is composed of three equally divided segments along the axial direction.

[0032] In one embodiment of this utility model, a coaxiality assurance fixture for a miniature thin-walled rotating body includes a threaded sleeve 2 and a segmented clamping body 1. The segmented clamping body 1 is composed of an external tapered thread 3, a segmented chuck 4, and a positioning step 5. It is made of LY12 hard aluminum alloy as raw material and is machined into three equal segments by wire cutting. The front end of the segmented clamping body 1 is machined into a positioning step surface for the miniature thin-walled rotating body, which serves as the axial main reference for the rotating body. The outer diameter is designed as a GZ1 / 2 external tapered thread 3, and the inner cavity is designed as a Φ14.5X42mm hollow cylinder.

[0033] Specifically, the axial length of the petal is 40-50 mm. Preferably, the axial length of the petal is 45 mm.

[0034] Specifically, the width of the gap between the lobes is 0.15±0.02mm, and a gap of 0.15±0.02mm is reserved between the lobes to meet the requirements of radial elastic contraction. The width of the gap between the lobes can be, but is not limited to, 0.17mm or 0.13mm.

[0035] Specifically, the fit clearance between the inner hole of the segmented clamp 1 and the outer circle of the thin-walled rotating part is 0.03-0.05 mm. The fit clearance may be, but is not limited to, 0.03 mm, 0.4 mm, or 0.05 mm.

[0036] Specifically, the wall thickness of the segmented clamp 1 is 5-9mm, and the wall thickness of the segmented clamp 1 can be, but is not limited to, 5mm, 6mm, 7mm, 8mm, or 9mm.

[0037] Specifically, both the threaded sleeve 2 and the split clamp body 1 are made of hard aluminum LY12 material.

[0038] Specifically, the axial position tolerance of the positioning step 5 relative to the end face of the segmented clamp 1 is ≤0.01mm.

[0039] Specifically, the step surface runout of the positioning step 5 is ≤0.005mm.

[0040] In one embodiment of this utility model, the coaxiality assurance fixture of the miniature thin-walled rotary body of this utility model, through experiments, uses hard aluminum (LY12) as the fixture material. The outer diameter of the precision-machined part is Ф14.5mm, Ф15mm and the end face of B are used to position and restrict the movement of the workpiece in the three coordinate directions of X, Y and Z. The workpiece is screw-clamped with a tapered threaded sleeve to restrict the rotation of the workpiece in the X, Y and Z coordinate directions.

[0041] In one embodiment of this utility model, the coaxiality assurance tooling of the miniature thin-walled rotary body of this utility model, in order to avoid the error of datum non-coincidence, selects the Ф14.5 and Ф15 outer circles and the end face of the B end that have been machined and formed at the B end as the positioning datum.

[0042] In one embodiment of this utility model, the coaxiality assurance fixture of the miniature thin-walled rotary body is used. After the fixture is machined according to the special fixture, the fixture is divided into three equal parts (45mm×1mm) along the axial direction using equipment resources. The inner hole of the fixture is made smaller as the nut is tightened using an external tapered thread, thereby clamping the part.

[0043] In one embodiment of this utility model, the coaxiality guarantee fixture of the miniature thin-walled rotary body of this utility model ensures that the fit clearance between the inner hole of the fixture and the outer circle of the part is 0.03mm to 0.05mm, and the wall thickness of the fixture is 5mm to 9mm.

[0044] In one embodiment of this utility model, the coaxiality of the miniature thin-walled rotary body ensures that the tooling, specifically the segmented clamping body 1, must be completed on the equipment in one go, without arbitrary disassembly during processing. This process continues until all processes of this step are completed for the same batch of products.

[0045] The coaxiality assurance fixture for this utility model of a miniature thin-walled rotary body is operated as follows: First, place the thin-walled rotary body part into the segmented clamping body 1. While screwing in the threaded sleeve 2, straighten the part until the stepped surface of the part is in contact with the end face of the clamping body. The conical surface engagement drives the segmented clamping body to contract radially and uniformly, and the contact surface between the clamping body and the part grips the outer diameter of the nozzle. Use a machine tool chuck to tighten the outer circle of the clamping body and use the outer diameter of the part exposed on the outside as a reference to correct the radial runout ≤0.005mm. The measured coaxiality of the inner hole of the part after precision machining is 0.01~0.02mm (requirement ≤0.02mm). Through the above specific embodiment, its core innovation lies in: axial positioning and thin-wall protection. Using the outer diameter of the part as a reference surface can completely avoid the cumulative error of thread positioning. The threaded sleeve only provides axial locking force, which is converted into radial clamping force through the conical surface. There is no relative rotation between the three jaws and the part, avoiding torsional deformation caused by thread engagement.

[0046] In summary, this utility model provides a coaxiality assurance fixture for a miniature thin-walled rotating body, comprising a threaded sleeve and a segmented clamping body. The design and machining datums of this fixture are strictly unified, completely eliminating the systematic error accumulation caused by datum conversion and datum non-coincidence during multiple clamping or process changes. The machining path planning revolves entirely around a unique and stable datum, minimizing the impact of datum transfer errors on the final coaxiality accuracy and significantly improving the predictability and upper limit of accuracy in the machining process.

[0047] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0048] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0049] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] The foregoing disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described above. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0051] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," and "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with an embodiment or example that are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] Although embodiments of this application have been shown and described above, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A coaxiality assurance fixture for a miniature thin-walled rotating body, characterized in that: It includes a threaded sleeve (2) and a split clamping body (1). The front end of the threaded sleeve (2) is provided with a tapered guide surface. The inner hole of the threaded sleeve (2) is provided with an internal tapered thread. When the threaded sleeve (2) is tightened, the tapered guide surface drives the split clamping body (1) to retract radially, so as to achieve centering and clamping of the thin-walled rotating part.

2. The coaxiality assurance fixture for a miniature thin-walled rotating body according to claim 1, characterized in that: The segmented clamping body (1) includes a segmented chuck (4), which is composed of multiple segments equally divided along the axial direction. The outer circle of each segment is provided with an outer tapered thread (3) that mates with the inner tapered thread. The inner wall of each segment is provided with a positioning step (5) that matches the outer step surface of the thin-walled rotating part. The multiple segments contract radially synchronously, so that the outer circle of the thin-walled rotating part fits against the positioning step (5) to achieve centering and clamping of the thin-walled rotating part.

3. The coaxiality assurance fixture for a miniature thin-walled rotating body according to claim 2, characterized in that: The split-type clamp (4) consists of three equally divided lobes along the axial direction.

4. The coaxiality assurance fixture for a miniature thin-walled rotating body according to claim 3, characterized in that: The width of the gap between the lobes is 0.15±0.02mm.

5. The coaxiality assurance fixture for a miniature thin-walled rotating body according to claim 1, characterized in that: The fit clearance between the inner hole of the split clamp body (1) and the outer circle of the thin-walled rotating body part is 0.03-0.05mm.

6. The coaxiality assurance fixture for a miniature thin-walled rotating body according to claim 1, characterized in that: The wall thickness of the segmented clamp body (1) is 5-9mm.

7. A coaxiality-ensuring fixture for a miniature thin-walled rotating body according to any one of claims 1 to 6, characterized in that: Both the threaded sleeve (2) and the split clamp body (1) are made of hard aluminum LY12 material.

8. The coaxiality assurance fixture for a miniature thin-walled rotating body according to claim 2, characterized in that: The axial position tolerance of the positioning step (5) relative to the end face of the split clamp body (1) is ≤0.01mm.

9. The coaxiality assurance fixture for a miniature thin-walled rotating body according to claim 2, characterized in that: The step surface runout of the positioning step (5) is ≤0.005mm.

10. The coaxiality assurance fixture for a miniature thin-walled rotating body according to claim 3, characterized in that: The axial length of the petal is 40–50 mm.

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