Hole forming device capable of adjusting aperture of formed hole on line

Abstract

The invention discloses a hole forming device capable of adjusting the aperture of a formed hole on line. The hole forming device comprises an eccentric hole-forming machine head component, an eccentric head feeding platform component, an aperture adjusting driving component, a main shaft cable winding-preventing component and a pressing foot component. According to the hole forming device, an inner eccentric sleeve and an outer eccentric sleeve are used for achieving high-speed self rotating of a tool and revolution of the tool around a changeable center in a hole forming process, and then compound motion needed by tool eccentric hole forming is provided. The self-rotating speed of the tool is achieved by the fact that an outer frequency changer controls the frequency of an electric main shaft. Aperture adjusting, tool revolution speed and tool axial feeding speed can be accurately controlled by programs through servo control motors. The hole forming device can achieve on-line formed hole aperture adjusting, hole forming efficiency is improved, meanwhile, machining of taper hole can be achieved, the problem of cable winding during main shaft high-speed rotating is avoided through a main shaft cable winding-preventing mechanism, and the stability and the safety of the whole hole forming device are improved.

Description

technical field [0001] The invention relates to an automatic hole-making technology for digital assembly, in particular to a hole-making device for adjusting the diameter of the hole on-line. Background technique [0002] With the rapid development of the aviation industry, in order to effectively improve the structural strength of the aircraft, reduce the weight of the aircraft structure, and reduce the energy consumption of the aircraft, a large number of laminated structures composed of aluminum alloys, titanium alloys, and carbon fiber composite materials are used on aircraft. At present, my country's aircraft assembly manufacturing industry basically still generally adopts the traditional manual hole-making process, that is, ordinary electric drills (or air drills) and carbide tools are used to make holes. There are many defects in this existing hole-making method: (1) A tool can only make holes with one diameter, and for different processing hole diameters, it is neces...

AI Technical Summary

Problems solved by technology

There are many defects in this existing hole-making method: (1) A tool can only make holes with one diameter, and for different processing hole diameters, it is necessary to select a tool with a corresponding diameter for processing; when there are multiple When the processing hole diameter is required, the operator is required to change the tool frequently, which will inevitably affect the processing efficiency; (2) The operator completely relies on the downward thrust of the drilling machine to extrude and remove the material in the central area of ​​the workpiece during the processing process. The Z-direction force is very large. When processing difficult-to-machine materials such as titanium alloys and carbon fiber composite materials, the tool will quickly wear out and fail; (3) The chips are curled and twisted. It needs to go through drilling, expanding and reaming multi-channel combined process processing and setting multiple tool changing links, not only the hole making efficiency is low, the labor intensity is high, and the economic benefit is poor; (4) The traditional drilling process is a continuous cutting process, The cutting edge is always in contact with the workpiece, and the temperature of the contact surface is very high. At the same time, the continuous cutting process causes the temperature to accumulate continuously, which not only accelerates the wear and failure of the tool, but also leads to a decrease in the quality of the processed surface; When the chip is discharged in the groove, when the chip is in direct contact with the surface of the machined hole, the machined surface will be scratched. In addition, the chip removal speed is slow, which affects the surface quality of the hole

[0004] However, the existing eccentric hole-making equipment also has shortcomings and deficiencies, for example: it does not have the ability to adjust the hole diameter on-line; when it is necessary to adjust the hole diameter during processing, it must stop processing (stop), and then adjust the eccentricity and fix it. The eccentricity can only continue to be processed later, which affects production efficiency

Existing eccentric hole making equipment cannot process tapered holes

The existing eccentric hole-making equipment has no anti-winding measures for the spindle cable, which reduces the stability and safety of the entire hole-making equipment and production

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