Eccentric directional assembly for eccentric reaming, eccentric dosing assembly, eccentric reaming assembly, kits and methods

Abstract

The invention provides an eccentric orientation assembly, an eccentric quantitative assembly, an eccentric reaming assembly, a kit and a method for eccentric hole reaming. The kit includes a fixed base (1), a telescopic mechanism (2), a variable inner diameter jigsaw set (3), a fastening screw (4), a positioning pin (5), a stop screw (6), and a positioning reference ruler ( 7). The eccentric orientation assembly includes a fixed base (1), a telescoping mechanism (2) and a positioning pin (5) in the kit. The eccentric quantitative component includes a fixed base (1), a telescoping mechanism (2), a variable inner diameter drill sleeve (3) and a positioning standard ruler (7) in the kit. The eccentric reaming assembly includes a fixed base (1), a telescopic mechanism (2), a variable inner diameter drill sleeve (3), a stop screw (6) and a hole-making drill in the kit. According to the invention, the operation of eccentric reaming is convenient and simple, and the precision is also improved.

Description

technical field [0001] The invention relates to the field of hole processing, in particular to a processing tool and method for eccentrically expanding existing holes. Background technique [0002] In the field of modern civil aircraft, fastener connection is a typical form of assembly connection. In order to ensure the connection strength, the center-to-center distance of the mounting holes of adjacent fasteners must meet strict requirements, otherwise it will lead to increased stress concentration, resulting in the risk of premature fatigue failure of the aircraft structure during operation. When there is a deviation in the positioning of the mounting hole, if the mounting hole is a guide hole and the deviation is within a certain range, the problem can be solved by eccentric reaming in the direction of increasing the hole center distance, thereby avoiding scrapping of parts. [0003] Patent application 201520286986.3 provides a jig for eccentric hole processing. This pat...

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Problems solved by technology

[0003] Patent application 201520286986.3 provides a jig for eccentric hole processing. This patent application uses the movement of the moving seat to make two non-coaxial eccentric holes on the cylinder at one time. Patent application Due to the fixed moving distance of the moving seat, only eccentric holes with fixed eccentricity can be processed

[0004] Patent application 201520348008.7 provides an adjustable drilling and tapping fixture for eccentric deep holes. This patent application can only perform one-time drilling of non-centered eccentric holes on parts, and cannot realize eccentric reaming of existing holes.

Moreover, the eccentric hole diameter of the patent application is fixed, and the workpiece needs to be clamped. For large workpieces (such as long trusses on airplanes, etc.), eccentric reaming cannot be implemented, and there is no measuring mechanism, so the positioning accuracy of the workpiece is low.

[0005] Therefore, none of the above-mentioned eccentric hole reaming techniques can carry out eccentric reaming of existing holes.

[0006] Aiming at the problem of eccentric hole reaming, the existing technology already has a solution, but this method needs to make a step with a small upper part and a larger lower part in the thickness direction of the workpiece to fix the reaming device, which will remove and damage the material of the workpiece , it is impossible to fix the reaming device for thin-walled parts such as long stringers on the aircraft

At the same time, there is no device for accurately determining the eccentric direction and eccentric amount. The current eccentric direction and eccentric amount are adjusted visually, with low precision and large errors. It is impossible to achieve accurate eccentric reaming of existing holes on thin-walled workpieces.

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