An Eccentric Adjustment Method for Helical Milling Holes

Abstract

The invention provides an eccentric adjustment method of a helical milling hole. The method of the present invention comprises a form in which an outer sleeve is equipped with a plurality of eccentric spindles with different eccentricities. All the eccentric spindles have the same shape and can be installed in the outer sleeve and can be quickly replaced. According to the processing requirements, the helical milling device is calculated To adjust the eccentricity value, select the eccentric spindle whose eccentricity adjustment range includes the required eccentricity adjustment value. When any eccentric main shaft is installed, the adjustable range of eccentricity is small, so the accurate adjustment of eccentricity can be realized, and a wide range of eccentricity can be adjusted by replacing the eccentric main shaft. The invention overcomes the deficiency of the eccentric adjustment method of the traditional helical milling device, realizes the high-precision adjustment and wide-range adjustment of the eccentricity at the same time, increases the processing aperture range, improves the processing quality, improves the processing efficiency, and reduces the processing cost.

Description

technical field [0001] The invention relates to the technical field of hole-making processing in the assembly of aerospace vehicles, in particular to an eccentric adjustment method for helical milling holes. Background technique [0002] Helical milling is a new technology in the aviation manufacturing industry. Its principle is to use a special end mill. The tool itself revolves around the axis of the hole to be machined while rotating at high speed, and feeds in the direction of the axis of the hole to be machined. Finally, a milling hole is milled on the workpiece. A circular hole with a diameter larger than the tool itself is called a helical milling hole because the tool feed path is helical. For the hole making of new materials such as composite materials and titanium alloys, because the axial cutting force of helical milling holes is smaller than that of drilling holes, it is superior to traditional drilling. Helical milling holes are applied to aircraft assembly inst...

AI Technical Summary

Problems solved by technology

Therefore, when the eccentricity can be adjusted in a large range, the eccentricity of the inner and outer sleeves will change greatly when the relative rotation of the inner and outer sleeves is small. When the adjustable range is very small, changing the eccentricity to the same value requires a relatively large angle of rotation between the inner and outer sleeves, which makes it easier to achieve micro-adjustment of the eccentricity and improve the accuracy of eccentricity adjustment. The range of small machinable holes is also reduced accordingly

Therefore, for the eccentricity adjustment method of the existing helical milling equipment, it is contradictory to improve the eccentricity adjustment accuracy and increase the adjustment range, and it is difficult to realize it at the same time.

[0004] In summary, the main difficulties in adjusting the eccentricity of the helical milling device are: (1) If the eccentricity is not adjusted accurately, it will directly lead to the failure of the processed hole diameter

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