Aircraft arm milling error-proofing tooling

Abstract

The utility model discloses an aircraft machine arm mills and cuts wrong tooling, including work platform, the work platform top surface is installed L type datum block, side pressure datum subassembly, annular embrace subassembly, side pressure embrace subassembly in proper order from front to back, and the inside surface of L type datum block supports and abuts at the machine arm front end, and side pressure datum subassembly from outside through the through -hole of machine arm joint end right side inwards and abuts at the left side surface in the machine arm, and the left side surface of machine arm outside is pasted to side datum block, and annular embrace subassembly is embraced and is installed in the machine arm circumferential outer wall surface, and side pressure embrace subassembly is embraced and is installed in the top surface, bottom surface of machine arm, and side pressure embrace subassembly is provided with side pressure block, and side pressure block is pressed from the machine arm outside to the right side surface of machine arm, and the left wall surface of machine arm outside is pasted to datum surface, to effectively guarantee the reliable clamping datum of machine arm on tooling, also has realized the clamping of two -sided side wall surface in vertical with the machine arm posture consistent, facilitates actual milling processing, helps to realize the complete processing of one -time clamping, and the practicality is good.

Description

Technical Field

[0001] This utility model relates to the field of machining auxiliary facilities technology, and in particular to a milling error prevention tooling for aircraft arms. Background Technology

[0002] The shape and structure of an aircraft have a great influence on its flight performance. As one of the main components of an aircraft, the fuselage arm needs to be machined with high precision after it is formed.

[0003] In the existing technology, due to the large number of milling positions on the machine arm, especially the finishing of the side walls, the existing machine arm can only lie down with its side facing down during milling due to the limitations of tooling clamping. It is necessary to switch the clamping posture during the processing to complete all the processing, which increases the clamping operation and requires more than two positioning, thus affecting the actual processing efficiency.

[0004] In addition, the machine arm has symmetrical parts on the left and right sides, which are partially modified in structure and not completely mirror images. During operation, it is difficult for operators to distinguish them visually. The existing simple tooling is used for clamping both left and right parts of the product, and only pin holes are used for positioning. The tooling is not equipped with error prevention facilities, which makes it very easy to make mistakes during clamping. Utility Model Content

[0005] To address the aforementioned issues, this application provides a reasonably structured milling and error-proof fixture for aircraft arms, which effectively ensures a reliable clamping reference for the arm on the fixture. It also enables vertical clamping of the two side walls that are consistent with the arm's attitude, facilitating actual milling operations and helping to achieve complete machining in a single clamping operation, thus demonstrating good practicality.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A milling error-proofing fixture for an aircraft arm includes a working platform. From front to back, an L-shaped reference block, a side-pressure reference assembly, a circumferential clamping assembly, and a side-pressure clamping assembly are sequentially mounted on the top surface of the working platform. The inner side of the L-shaped reference block supports and abuts against the front end of the arm. The side-pressure reference assembly extends inward from the outside through a through-hole on the right side of the arm joint end and abuts against the inner left side of the arm, causing the outer left side of the arm to conform to the side reference block. The circumferential clamping assembly is circumferentially clamped to the outer wall of the arm. The side-pressure clamping assembly is clamped vertically to the top and bottom surfaces of the arm. A side-pressure block is also provided in the side-pressure clamping assembly, which applies pressure from the outside of the arm to the outer right side of the arm, causing the outer left wall of the arm to conform to the reference surface.

[0008] As a further improvement to the above technical solution:

[0009] It also includes a fault-prevention block, which is installed at the front of the work platform and located on the outer left wall of the arm joint end.

[0010] The structure of the side-pressure clamping assembly is as follows: it includes a support installed on the working platform at left and right intervals, and an L-shaped seat is installed on the side of the two supports. An upper pressure block is installed on the top of the L-shaped seat. The side pressure block is located at the right end of the opening of the L-shaped seat. The L-shaped seat, together with the upper pressure block and the side pressure block, surrounds the outer wall of the machine arm. The side pressure block drives the outer left wall of the machine arm to adhere to the inner vertical wall of the side pressure block.

[0011] A support block is installed on the working platform located on the right side of the L-shaped seat opening. A guide is installed through the support block toward the side pressure block. A pressure rod is also threaded onto the support block. The inner end of the pressure rod abuts against the side pressure block, and the outer end of the pressure rod is fitted with a handle for easy manual rotation.

[0012] The vertical arm of the L-shaped seat and the side of the upper pressure block are fitted together with a locking block. The locking block is fastened to the L-shaped seat by fasteners and locked to the upper pressure block by a quick-locking device.

[0013] The circumferential clamping assembly includes two circumferential clamping assemblies arranged at intervals, namely Circumferential Clamping Assembly 1 and Circumferential Clamping Assembly 2. The structures of Circumferential Clamping Assembly 1 and Circumferential Clamping Assembly 2 are identical. The structure of Circumferential Clamping Assembly 2 is as follows: it includes two supports installed on the working platform at intervals on the left and right. A lower U-shaped block is installed on the side of the two supports. An upper U-shaped block is arranged above the lower U-shaped block. The upper U-shaped block and the lower U-shaped block together surround the outer wall of the arm. It also includes a locking block 2 that fits against the side of the joint between the upper U-shaped block and the lower U-shaped block. The locking block 2 is locked and fixed to the upper U-shaped block and the lower U-shaped block by a quick-locking device.

[0014] It also includes a clamping assembly, which is located on the outside of the right outer side of the machine arm, with the clamping block in the clamping assembly pressed against the back of the through hole opening of the machine arm.

[0015] The structure of the clamping assembly is as follows: it includes a support three installed on the working platform, a clamping block connected to the side of the support three via a locking component, an abutment component threaded through the clamping block, and the inner end of the abutment component abutting against the side of the support three; the inner side of the clamping block located above the support three is in contact with the outer wall of the machine arm.

[0016] The structure of the side pressure reference assembly is as follows: it includes a support four installed on the working platform, a side pressure arm installed on the support four via a quick-locking device, the side pressure arm bends and extends into the inside of the machine arm, and an abutment block is installed at the inner end of the side pressure arm, the abutment block is attached to the inner left side of the machine arm; the abutment block and the side reference block are directly opposite the inner and outer sides located at the same position on the left wall of the machine arm.

[0017] The inner side of the L-shaped reference block is provided with a vertical surface, a concave arc surface, an inclined surface, a groove, and a plane from top to bottom. The vertical surface, the inclined surface, and the plane are respectively attached to the outer wall of the front part of the arm from top to bottom.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This utility model, through the arrangement of an L-shaped reference block, a side-pressure reference component, a circumferential clamping component, and a side-pressure clamping component on the working platform from front to back, ensures reliable reference positioning of the arm when clamped on the tooling, effectively guaranteeing machining accuracy. It also achieves vertical clamping of the two side walls that are consistent with the arm's posture, which is convenient for actual milling operations and helps to achieve complete machining in one clamping, making it highly practical.

[0020] This utility model also has the following advantages:

[0021] By setting up anti-misalignment blocks, corresponding to the application of the left and right parts of the machine arm, if the wrong parts are installed, the machine arm will be unable to be installed onto the tooling due to the interference of the anti-misalignment blocks, thus effectively preventing clamping errors.

[0022] By setting the side-pressure clamping component, while achieving clamping and limiting of the circumferential wall of the machine arm, the reference positioning of the machine arm can be ensured by the side pressure block, and the gap between the side pressure block and the upper pressure block can also be reserved to ensure the processing requirements of the machine arm.

[0023] In the side pressure reference assembly, the side pressure arm extends from the outside to the inside of the machine arm, thereby effectively ensuring a stable fit between the outer left wall of the machine arm and the reference. Attached Figure Description

[0024] Figure 1 This is a schematic diagram showing the state of the machine arm of this utility model being clamped on the tooling.

[0025] Figure 2 This is a schematic diagram of the tooling of this utility model.

[0026] Figure 3 This is a schematic diagram of the side-pressure clamping assembly of this utility model.

[0027] Figure 4 This is a schematic diagram of the structure of the second circumferential clamping component of this utility model.

[0028] Figure 5 This is a schematic diagram of the structure of the clamping assembly of this utility model.

[0029] Figure 6 This is a schematic diagram of the side pressure reference assembly of this utility model.

[0030] Figure 7 This is a schematic diagram of the structure of the L-shaped reference block of this utility model.

[0031] The components include: 1. Working platform; 2. L-shaped reference block; 3. Side pressure reference assembly; 4. Clamping assembly; 5. Circumferential clamping assembly one; 6. Circumferential clamping assembly two; 7. Side pressure clamping assembly; 8. Anti-misalignment block; 10. Machine arm; 11. Through hole;

[0032] 21. Vertical surface; 22. Concave arc surface; 23. Inclined surface; 24. Groove; 25. Plane;

[0033] 30. Side reference block; 31. Support four; 32. Side pressure arm; 33. Abutment block; 331. Notch;

[0034] 41. Support 3; 42. Locking assembly; 43. Clamping block; 44. Abutment component;

[0035] 61. Support 2; 62. Locking block 2; 63. Upper U-shaped block; 64. Lower U-shaped block;

[0036] 71. Support 1; 72. L-shaped seat; 73. Locking block 1; 74. Upper pressure block; 75. Side pressure block; 76. Support block; 77. Guide component; 78. Pressure rod; 721. Side reference surface. Detailed Implementation

[0037] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0038] like Figure 1 and Figure 2 As shown, this embodiment of an aircraft arm milling error-proofing fixture includes a working platform 1. From front to back, an L-shaped reference block 2, a side-pressure reference assembly 3, a circumferential clamping assembly, and a side-pressure clamping assembly 7 are sequentially installed on the top surface of the working platform 1. The inner side of the L-shaped reference block 2 supports and abuts against the front end of the arm 10. The side-pressure reference assembly 3 extends inward from the outside through a through hole 11 on the right side of the joint end of the arm 10 and abuts against the inner left side of the arm 10, causing the outer left side of the arm 10 to adhere to the side reference block 30. The circumferential clamping assembly is circumferentially clamped to the outer wall of the arm 10. The side-pressure clamping assembly 7 is clamped vertically on the top and bottom surfaces of the arm 10. A side-pressure block 75 is also provided in the side-pressure clamping assembly 7, which applies pressure from the outside of the arm 10 to the outer right side of the arm 10, causing the outer left wall of the arm 10 to adhere to the reference surface.

[0039] In this embodiment, the L-shaped reference block 2, the side pressure reference component 3, the circumferential clamping component, and the side pressure clamping component 7 arranged on the working platform 1 from front to back ensure reliable reference positioning of the arm 10 when it is clamped on the tooling, effectively guaranteeing machining accuracy. It also realizes that the two side walls that are consistent with the posture of the arm 10 are vertically clamped, which is convenient for actual milling.

[0040] In this embodiment, the L-shaped reference block 2 performs reference positioning of the robot arm 10 at the front, the side pressure reference assembly 3 performs side reference positioning of the robot arm 10 at the joint, and the side pressure clamping assembly 7 performs side reference positioning of the robot arm 10 at the rear. Combined with the circumferential clamping assembly for circumferential clamping of the robot arm 10, the reliable and stable clamping of the robot arm 10 on the tooling is effectively ensured.

[0041] It also includes a fault-prevention block 8, which is installed at the front of the work platform 1 and is located on the outer left wall of the joint end of the arm 10.

[0042] In this embodiment, by setting the error prevention block 8, corresponding to the applicability of the left and right parts of the machine arm 10, when the error is made, the machine arm 10 will not be able to be installed on the tooling due to the interference of the error prevention block 8, thus effectively realizing the clamping error prevention.

[0043] In this embodiment, the error prevention block 8 is installed in accordance with the local design changes on the side of the joint of the machine arm 10, and is used to effectively prevent errors in the installation of the left and right machine arms 10.

[0044] like Figure 3 As shown, the structure of the side-pressure clamping assembly 7 is as follows: it includes supports 71 installed on the working platform 1 at left and right intervals, and L-shaped seats 72 are installed on the sides of the two supports 71. An upper pressure block 74 is installed on the upper part of the L-shaped seat 72. The side pressure block 75 is located at the right end of the opening of the L-shaped seat 72. The L-shaped seat 72, together with the upper pressure block 74 and the side pressure block 75, surrounds the outer wall of the arm 10. The side pressure block 75 drives the outer left wall of the arm 10 to adhere to the inner vertical wall of the side pressure block 75, that is, to adhere to the side reference surface 721.

[0045] In this embodiment, by setting the side-pressure clamping component 7, while achieving clamping and limiting of the circumferential wall surface of the machine arm 10, the reference positioning of the machine arm 10 can be ensured by the side pressure block 75, and the gap between the side pressure block 75 and the upper pressure block 74 can also be reserved to ensure the processing requirements of the machine arm 10.

[0046] In this embodiment, flexible materials such as rubber can be laid on the inner side of the side pressure block 75 and the bottom surface of the upper pressure block 74 to reduce the rigid contact force applied to the arm 10.

[0047] A support block 76 is installed on the work platform 1 located on the right side of the opening of the L-shaped seat 72. A guide 77 is installed through the support block 76 toward the side pressure block 75. A pressure rod 78 is also threaded on the support block 76. The inner end of the pressure rod 78 abuts against the side pressure block 75, and the outer end of the pressure rod 78 is equipped with a handle for easy manual rotation.

[0048] In actual operation, after placing the machine arm 10 inside the L-shaped seat 72, the pressure rod 78 can be rotated to apply force, causing the pressure rod 78 to move axially relative to the support block 76. The inner end of the pressure rod 78 presses against the side pressure block 75, causing the side pressure block 75 to move inward relative to the support block 76 with the guide member 77 as the guide, and then the side pressure block 75 applies force to the machine arm 10.

[0049] The vertical arm of the L-shaped seat 72 and the side of the upper pressure block 74 are fitted together with a locking block 73. The locking block 73 is fastened to the L-shaped seat 72 by fasteners and is fastened to the upper pressure block 74 by a quick-locking device.

[0050] In this embodiment, the quick-locking device is a standard product purchased from outside. It facilitates direct manual locking and loosening operations, achieving a locking effect similar to that of fasteners such as bolts, and realizing quick installation and fixation between the locking block 73 and the upper pressure block 74.

[0051] The circumferential clamping assembly includes two circumferential clamping assemblies, 5 and 6, arranged at intervals, to effectively clamp and fix the arm 10 along its length. The circumferential clamping assemblies 5 and 6 have identical structures. Figure 4 As shown, the structure of the circumferential clamping assembly 6 is as follows: it includes two supports 61 installed on the working platform 1 at left and right intervals, with a lower U-shaped block 64 installed on the side of the two supports 61, and an upper U-shaped block 63 arranged above the lower U-shaped block 64. The upper U-shaped block 63 and the lower U-shaped block 64 together surround the outer wall of the arm 10; it also includes a locking block 62 that fits against the side of the joint between the upper U-shaped block 63 and the lower U-shaped block 64. The locking block 62 is locked and fixed to the upper U-shaped block 63 and the lower U-shaped block 64 by a quick-locking device.

[0052] In this embodiment, the quick-locking device is a standard product purchased from outside. It facilitates direct manual locking and loosening operations, achieving a locking effect similar to that of fasteners such as bolts, and realizing quick installation and fixation between locking block 62 and upper U-shaped block 63 and lower U-shaped block 64.

[0053] In this embodiment, flexible materials such as rubber can be applied to the opposing sides of the upper U-shaped block 63 and the lower U-shaped block 64 to reduce the rigid contact force on the arm 10 while ensuring reliable clamping and fixing.

[0054] It also includes a clamping assembly 4, which is located on the outside of the right outer side of the arm 10. The clamping block 43 in the clamping assembly 4 is pressed against the back of the through hole 11 of the arm 10 to ensure reliable fixed positioning at the through hole 11 of the arm 10.

[0055] like Figure 5As shown, the structure of the clamping assembly 4 is as follows: it includes a support 3 41 installed on the working platform 1, a clamping block 43 connected to the side of the support 3 41 via a locking member 42, an abutment member 44 threaded through the clamping block 43, and the inner end of the abutment member 44 abutting against the side of the support 3 41; the inner side of the clamping block 43 located above the support 3 41 is attached to the outer wall of the arm 10.

[0056] In this embodiment, while the end of the locking member 42 is locked to the support 3 41, the locking member 42 can also serve as a guide structure for the movement of the pressing block 43 relative to the support 3 41. As the abutment member 44 rotates under the applied force, the pressing block 43 is caused to move axially in the abutment member 44.

[0057] In this embodiment, the abutment member 44 can be a bolt of appropriate length.

[0058] In this embodiment, flexible materials such as rubber can be applied to the inner side of the clamping block 43 to reduce rigid contact with the machine arm 10 while ensuring that the machine arm 10 is adhered to the outer wall surface.

[0059] like Figure 6 As shown, the structure of the side pressure reference assembly 3 is as follows: it includes a support 31 installed on the working platform 1, a side pressure arm 32 installed on the support 31 via a quick-locking device, the side pressure arm 32 is bent and extended into the inside of the machine arm 10, and an abutment block 33 is installed at the inner end of the side pressure arm 32, the abutment block 33 is attached to the inner left side of the machine arm 10; the abutment block 33 and the side reference block 30 are directly opposite the inner and outer sides located at the same position on the left wall of the machine arm 10.

[0060] In this embodiment, the side pressure arm 32 in the side pressure reference assembly 3 extends from the outside to the inside of the machine arm 10, thereby effectively ensuring a stable fit between the outer left wall surface of the machine arm 10 and the reference.

[0061] In this embodiment, the side pressure arm 32 has a horizontally bent structure, so that after it extends through the through hole 11 of the arm 10, the abutment block 33 applies force to a preset position on the inner side of the arm 10.

[0062] In this embodiment, the side pressure arm 32 can be composed of multiple strip blocks connected end to end and welded together with reinforcing ribs.

[0063] In this embodiment, flexible materials such as rubber can be applied to the side of the abutment block 33 facing the inner wall of the arm 10, so as to reduce rigid contact with the arm 10 while applying force to fit the arm 10.

[0064] In this embodiment, clearance holes can also be made in the side pressure reference component 3, clamping component 4 and other components that fit with the machine arm 10 as required, such as the notch 331 made on the abutment block 33 of the side pressure reference component 3, so as to ensure the processing of the machine arm 10 while ensuring the tooling clamping requirements.

[0065] like Figure 7 As shown, the inner side of the L-shaped reference block 2 is provided with a vertical surface 21, a concave arc surface 22, an inclined surface 23, a groove 24, and a plane 25 from top to bottom. The vertical surface 21, the inclined surface 23, and the plane 25 are respectively attached to the outer wall of the front part of the arm 10 from top to bottom.

[0066] In this embodiment, by setting vertical surfaces 21, inclined surfaces 23, and planes 25 that are in contact with the outer wall of the arm 10 at intervals, the reliability of the L-shaped reference block 2 as the front alignment reference of the arm 10 is effectively guaranteed, and the fit between the arm 10 and the positioning reference is guaranteed when the arm 10 is clamped on the tooling.

[0067] In this embodiment, the vertical surface 21, the inclined surface 23, and the plane 25 are located on the vertical arm, the corner position, and the horizontal arm of the L-shaped reference block 2, respectively, to achieve reliable positioning and support for the arm 10.

[0068] In this embodiment, the plane 25 can be set as a horizontal plane 25 or a slightly inclined plane 25 according to the actual needs of the arm 10, as long as it can reliably fit with the outer wall of the arm 10 and serve as a reference.

[0069] This invention ensures reliable reference positioning of the arm when clamped on the tooling, effectively guaranteeing machining accuracy. It also enables vertical clamping of the two side walls that are consistent with the arm's posture, facilitating actual milling operations and helping to achieve complete machining in a single clamping operation, making it highly practical.

[0070] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0071] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A milling and error-proofing fixture for aircraft arms, comprising a work platform (1), characterized in that: The top surface of the work platform (1) is sequentially equipped with an L-shaped reference block (2), a side pressure reference component (3), a circumferential clamping component, and a side pressure clamping component (7) from front to back. The inner side of the L-shaped reference block (2) supports and abuts against the front end of the arm (10). The side pressure reference component (3) extends from the outside through the through hole (11) on the right side of the joint end of the arm (10) and abuts against the inner left side of the arm (10), causing the outer left side of the arm (10) to fit against the side reference block (30). The circumferential clamping component is circumferentially clamped against the outer wall of the arm (10). The side pressure clamping component (7) clamps the top and bottom surfaces of the arm (10) from top to bottom. The side pressure clamping component (7) is also provided with a side pressure block (75). The side pressure block (75) applies pressure from the outside of the arm (10) to the outer right side of the arm (10), causing the outer left wall of the arm (10) to fit against the reference surface.

2. The error-proof fixture for milling aircraft arms as described in claim 1, characterized in that: It also includes a fault-prevention block (8), which is installed at the front of the work platform (1) and is located on the outer left wall of the joint end of the arm (10).

3. The error-proof fixture for milling aircraft arms as described in claim 1, characterized in that: The structure of the side-pressure clamping assembly (7) is as follows: it includes a support (71) installed on the working platform (1) at left and right intervals, and an L-shaped seat (72) is installed on the side of the two supports (71). An upper pressure block (74) is installed on the upper side of the L-shaped seat (72). The side pressure block (75) is located at the right end of the opening of the L-shaped seat (72). The L-shaped seat (72) combined with the upper pressure block (74) and the side pressure block (75) surrounds the outer wall of the arm (10). The side pressure block (75) drives the outer left wall of the arm (10) to adhere to the inner vertical wall of the side pressure block (75).

4. The error-proof fixture for milling an aircraft arm as described in claim 3, characterized in that: A support block (76) is installed on the work platform (1) located on the right side of the opening of the L-shaped seat (72). A guide (77) is installed through the support block (76) toward the side pressure block (75). A pressure rod (78) is also threaded on the support block (76). The inner end of the pressure rod (78) abuts against the side pressure block (75), and the outer end of the pressure rod (78) is fitted with a handle that is easy to rotate manually.

5. The error-proof fixture for milling an aircraft arm as described in claim 3, characterized in that: The vertical arm of the L-shaped seat (72) and the side of the upper pressure block (74) are fitted together with a locking block (73). The locking block (73) is fastened to the L-shaped seat (72) by fasteners and is fastened to the upper pressure block (74) by a quick-locking device.

6. The error-proof fixture for milling an aircraft arm as described in claim 1, characterized in that: The circumferential clamping assembly includes two circumferential clamping assemblies (5) and (6) arranged at intervals. The structures of the two circumferential clamping assemblies (5) and (6) are the same. The structure of the circumferential clamping assembly (6) is as follows: it includes two supports (61) installed on the working platform (1) at intervals on the left and right. The two supports (61) are jointly installed with a lower U-shaped block (64) on their sides. An upper U-shaped block (63) is arranged above the lower U-shaped block (64). The upper U-shaped block (63) and the lower U-shaped block (64) are together arranged around the outer wall of the arm (10). It also includes a locking block (62) attached to the side of the junction of the upper U-shaped block (63) and the lower U-shaped block (64). The locking block (62) is locked and fixed to the upper U-shaped block (63) and the lower U-shaped block (64) by a quick locking device.

7. The error-proof fixture for milling an aircraft arm as described in claim 1, characterized in that: It also includes a clamping assembly (4), which is located on the outside of the right outer side of the arm (10), and the clamping block (43) in the clamping assembly (4) is attached to the back of the through hole (11) of the arm (10).

8. The error-proof fixture for milling an aircraft arm as described in claim 7, characterized in that: The structure of the clamping assembly (4) is as follows: it includes a support three (41) installed on the working platform (1), a clamping block (43) is connected and installed on the side of the support three (41) via a locking member (42), an abutment member (44) is threaded through the clamping block (43), and the inner end of the abutment member (44) abuts against the side of the support three (41); the inner side of the clamping block (43) located above the support three (41) is attached to the outer wall of the arm (10).

9. The error-proof fixture for milling an aircraft arm as described in claim 1, characterized in that: The structure of the side pressure reference assembly (3) is as follows: it includes a support four (31) installed on the working platform (1), a side pressure arm (32) installed on the support four (31) via a quick locking device, the side pressure arm (32) bends and extends into the inside of the machine arm (10), and an abutment block (33) is installed at the inner end of the side pressure arm (32), the abutment block (33) is attached to the inner left side of the machine arm (10); the abutment block (33) and the side reference block (30) are directly opposite the inner and outer sides located at the same position on the left wall of the machine arm (10).

10. The error-proof fixture for milling an aircraft arm as described in claim 1, characterized in that: The inner side of the L-shaped reference block (2) is provided with a vertical surface (21), a concave arc surface (22), an inclined surface (23), a groove (24), and a plane (25) from top to bottom. The vertical surface (21), the inclined surface (23), and the plane (25) are respectively attached to the outer wall of the front part of the arm (10) from top to bottom.

Images