Clamping auxiliary device for aviation butterfly plate machining
By designing an auxiliary device for machining aerospace disc plates, the problems of clamping error and alignment error were solved, enabling efficient and stable machining of aerospace disc plates and improving machining accuracy and efficiency.
Patent Information
- Application Number
- CN202422735939.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-07
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2034-11-07
AI Technical Summary
Existing technologies for machining aircraft discs suffer from problems such as large clamping errors, numerous alignment errors, severe tool wear, insufficient rigidity, frequent replacement of machining center locating pins, and high risk of deformation, resulting in low machining accuracy and efficiency.
The aerospace-grade disc plate machining clamping auxiliary device, through the design of three process axes and clamping device, achieves stable positioning and efficient clamping of parts. Combined with five-axis linkage machining, it avoids alignment errors and machining interference, thereby improving machining quality and efficiency.
It achieves efficient assurance of part form and position tolerances, reduces the number of clamping operations and machining cycles, improves machining stability and repeatability, reduces tool wear and the frequency of locating pin replacement, and improves machining accuracy and efficiency.
Smart Images
Figure CN223889434U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of parts machining technology, and relates to a novel clamping fixture for parts, which is applied in the processing of butterfly plates, specifically to an auxiliary device for clamping in the processing of aviation butterfly plates. Background Technology
[0002] The original process for the butterfly plate involved turning the spherical surface and annular groove by hand, and milling other features by machining center. Due to the high requirements for dimensional tolerances and positional accuracy, the datum and measured elements were machined in separate processes, resulting in accumulated clamping errors, alignment errors, and measurement errors. It was also difficult to guarantee the relevant positional accuracy. At the same time, the intermittent machining by hand caused severe tool wear, and the locating pins of the machining center needed to be replaced frequently due to the large cutting force. Uneven force during the clamping process of the pressure plate could easily cause deformation of the parts. When the original five-axis machining center was used, the tool overhang was long and the rigidity was insufficient due to the need to avoid the tooling cover plate, requiring repeated re-cutting. Utility Model Content
[0003] To address the aforementioned issues, this invention provides an auxiliary device for clamping and machining aircraft butterfly plates. This device offers stable clamping, high machining quality, and good repeatability, significantly improving the aircraft butterfly plate machining process.
[0004] The technical solution of this utility model:
[0005] An auxiliary device for machining and clamping aircraft discs includes a main body, clamping devices, and process shafts. Three process shafts are vertically arranged at the bottom of the aircraft disc part. The bottom of the main body is the connection part with the machine tool. The top of the main body is provided with a circular platform and three semi-circular grooves. The bottom of the aircraft disc part is placed on the circular platform, and the three process shafts are inserted into the three semi-circular grooves. Three clamping devices are respectively arranged on the outside of the three semi-circular grooves to clamp the three process shafts.
[0006] Furthermore, the outer side of the semicircular groove is provided with a tiger's mouth structure, the outer end of the clamping device is provided with a protruding edge that matches the tiger's mouth structure, and there is a gap between the bottom of the inner end of the clamping device and the bottom of the semicircular groove.
[0007] Furthermore, the clamping device has a through hole in the middle and a vertical threaded hole in the middle of the semi-circular groove. The bolt passes through the through hole of the clamping device and is screwed into the threaded hole. The cooperation between the clamping device and the semi-circular groove jaw structure transforms the downward force on the clamping device into deformation in the direction of the inner side of the semi-circular groove.
[0008] Furthermore, the inner end of the clamping device has a bevel that matches the shape of the process shaft.
[0009] Furthermore, a slot is provided at the bottom of the inner side of the semi-circular groove. The position of the slot matches the position of the process shaft, and the inner diameter of the slot is slightly larger than the outer diameter of the process shaft.
[0010] Furthermore, the clamping device is positioned below the height of the circular platform at the top of the main body, thus avoiding any interference with the machining of the aircraft-grade disc.
[0011] Technical effects of this utility model:
[0012] By adopting the above technical solution, a stable tooling optimization process and a method for ensuring geometric tolerances are used, the spherical surface is machined through five-axis linkage fitting, and all geometric tolerances are ensured by one-time clamping and positioning. The traditional three-hole positioning is replaced by a three-column quick positioning and locking device, which avoids problems such as alignment error, machining interference, and uneven force. It can achieve the effect of quick changeover and stable machining. The tooling is practical and flexible, and can be used for clamping and fixing different butterfly plate parts. Attached Figure Description
[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is a three-dimensional schematic diagram of how the parts are clamped according to this utility model;
[0015] Figure 2 yes Figure 1 Side view;
[0016] Figure 3 yes Figure 1 Another directional diagram;
[0017] Figure 4 yes Figure 1 Top view;
[0018] Figure 5 yes Figure 1 A partial sectional view;
[0019] Figure 6 This is an enlarged top view of the clamping device;
[0020] Figure 7 This is a side sectional view of the clamping device;
[0021] Among them, 1-main body, 2-clamping device, 3-positioning key, 4-screw, 5-clamping positioning surface, 6-bolt, 7-elastic sealing ring. Detailed Implementation
[0022] This section describes embodiments of the present invention, used to explain and illustrate the technical solutions of the present invention. Unless otherwise specified, the embodiments and features described herein can be combined with each other.
[0023] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are based on the orientation or positional relationships in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include more than one of those features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0025] Example 1:
[0026] A novel slotted positioning and locking fixture includes a fixture body 1, a clamping device 3, a positioning key 4, and screws 4. The clamping device possesses strong clamping force. Its main body is machined using cylindrical pins adapted to the part's positioning axis. Three semi-circular grooves in the main body correspond to the part's process axis, achieving part positioning and locking. The clamping elements can achieve a clamping force of 1700N, ensuring complete reliability for part machining. Furthermore, this fixture offers high flexibility, allowing for machining according to the part's shape. It is simple to operate and highly safe. This fixture design enables the datum and the measured element to be processed in a single machining center operation.
[0027] An auxiliary device for machining and clamping aircraft discs includes a main body 1, clamping devices 2, and process shafts. Three process shafts are vertically arranged at the bottom of the aircraft disc part. The bottom of the main body 1 is the connection part with the machine tool. The top of the main body 1 is provided with a circular platform and three semi-circular grooves. The bottom of the aircraft disc part is placed on the circular platform, and the three process shafts are inserted into the three semi-circular grooves. The three clamping devices 2 are respectively arranged on the outside of the three semi-circular grooves to clamp the three process shafts.
[0028] The outer side of the semicircular groove is provided with a tiger's mouth structure, and the outer end of the clamping device 2 is provided with a protruding edge that matches the tiger's mouth structure. There is a gap between the bottom of the inner end of the clamping device 2 and the bottom of the semicircular groove.
[0029] The clamping device 2 has a through hole in the middle and a vertical threaded hole in the middle of the semi-circular groove. The bolt passes through the through hole of the clamping device 2 and is screwed into the threaded hole. The cooperation between the clamping device 2 and the semi-circular groove jaw structure causes the downward force on the clamping device 2 to be transformed into deformation in the direction of the semi-circular groove.
[0030] The inner end of the clamping device 2 has an inclined surface that matches the shape of the process shaft.
[0031] The bottom of the inner side of the semi-circular groove is provided with a slot hole, the position of which matches the position of the process shaft, and the inner diameter of the slot hole is slightly larger than the outer diameter of the process shaft.
[0032] The clamping device 2 is lower than the height of the circular platform at the top of the main body 1, thus avoiding interference with the machining of the aircraft disc.
[0033] Example 2:
[0034] This utility model is a special fixture for clamping aerospace butterfly plate parts. It is reliable for clamping and easy to disassemble. Under the premise of optimizing the process route and concentrating the processing steps, it can perform multiple processes in one clamping, thereby improving the processing accuracy of butterfly plate parts.
[0035] This utility model's specialized fixture enables the simultaneous protection of the reference datum and the measured element in the same process, effectively improving the stability of part clamping and ensuring high-quality dimensional accuracy. Three process shafts are machined on the part, with three semi-circular grooves on the fixture body for positioning. The clamping device has arc surfaces corresponding to the process shafts. Through continuous downward pressure from the hexagonal socket bolts, the clamping device moves forward. The grooved surface on the clamping device prevents interference with the part during this forward movement. The arc surface of the clamping device contacts the part, thus achieving clamping.
[0036] The main body of the tooling has slots for installing clamping elements, which can be machined according to the process axis of the part. The clamping force is directed and applied to the positioning axis by the contact surface of the process axis and the inclined surface of the clamping jaw to clamp the part. The structure is simple and easy to disassemble and assemble. Compared with the traditional three-hole centering tooling, the clamping is more reliable. The three-hole centering only achieves positioning, and the outer diameter of the positioning pin is mostly limited to 2-4mm. It requires the pressure plate to press the part tightly. When the clamping force is uneven, it is easy to press the part crooked. In terms of strength, the positioning pin needs to be replaced frequently. The original tooling has obvious disadvantages in terms of installation and processing strength.
[0037] The tooling is highly versatile. The butterfly plate product itself has no process shaft, but for processing purposes, a process shaft for subsequent clamping and positioning can be machined on the surface of the part. There are no special requirements for the size and center distance of the process shaft. For subsequent similar products, process shafts that can be used with existing fixtures can be machined on the basis of the designed fixture, saving manufacturing costs.
[0038] The circular platform at the top of the fixture body has a notch between two semicircular slots. The position of the notch matches the structure of the side machining surface of the aircraft disc, thereby avoiding the machining position.
[0039] By optimizing the process plan and combining the machining operations of turning and machining center, the original tooling design could not be realized. Based on on-site experience and reference to the tooling used in the past, there were no mature clamping elements to clamp the parts. After consulting relevant fixture information, a simple and compact slotted fixture was selected as the clamping element, which can realize the machining of the features of this process. All geometric tolerances are guaranteed by clamping and positioning in one setup.
[0040] Through the above technological improvements, the machining process requires no debugging, the positional accuracy is measured and qualified on the first attempt, and the changeover time is approximately zero. In terms of fixtures alone, it reduces the investment in dedicated fixtures for CNC lathe machining processes using traditional methods. For tooling installation, each machine tool can be shortened by 15-20 minutes. The butterfly plate integrates two machining processes, reducing the use of CNC lathes and corresponding dedicated tools and fixtures, significantly reducing the number of part clamping operations and turnaround time, shortening the part machining cycle, and allowing for the rational and full utilization of the five-axis machining center, achieving true cost reduction, efficiency improvement, and lean production. Based on dozens of butterfly plate parts in the factory, its application can be gradually promoted.
[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should be covered within the protection scope of this utility model.
Claims
1. An auxiliary device for clamping and machining aircraft discs, characterized in that, Includes a main body (1), clamping devices (2) and process shafts. Three process shafts are vertically arranged at the bottom of the aircraft butterfly plate part. The bottom of the main body (1) is the connection part with the machine tool. The top of the main body (1) is provided with a circular platform and three semi-circular grooves. The bottom of the aircraft butterfly plate part is placed on the circular platform, and the three process shafts are inserted into the three semi-circular grooves. Three clamping devices (2) are respectively arranged on the outside of the three semi-circular grooves to clamp the three process shafts.
2. The aerospace disc processing clamping auxiliary device according to claim 1, characterized in that, The outer side of the semicircular groove is provided with a tiger mouth structure, and the outer end of the clamping device (2) is provided with a protruding edge that matches the tiger mouth structure. There is a gap between the bottom of the inner end of the clamping device (2) and the bottom of the semicircular groove.
3. The aerospace disc processing clamping auxiliary device according to claim 2, characterized in that, The clamping device (2) has a through hole in the middle and a vertical threaded hole in the middle of the semi-circular groove. The bolt passes through the through hole of the clamping device (2) and is screwed into the threaded hole. The cooperation between the clamping device (2) and the semi-circular groove tiger mouth structure makes the downward force on the clamping device (2) transformed into deformation in the direction of the inner side of the semi-circular groove.
4. The aerospace disc processing clamping auxiliary device according to claim 1, characterized in that, The inner end of the clamping device (2) has a bevel that matches the shape of the process shaft.
5. The aerospace disc processing clamping auxiliary device according to claim 1, characterized in that, The bottom of the inner side of the semi-circular groove is provided with a slot hole, the position of which matches the position of the process shaft, and the inner diameter of the slot hole is slightly larger than the outer diameter of the process shaft.
6. The aerospace disc processing clamping auxiliary device according to claim 1, characterized in that, The clamping device (2) is lower than the height of the circular platform at the top of the main body (1).