End mill and rotating shaft beam airfoil hyperboloid milling method based on end mill

An end mill and hyperboloid technology, applied in milling cutters, milling machine equipment, details of milling machine equipment, etc., can solve problems such as the inability to meet the needs of the machining of the hyperboloid surface of the aircraft shaft beam wing surface, the inability to geometrically mesh, and the difficult-to-cut materials.

Inactive Publication Date: 2021-09-10
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, TC21 titanium alloy difficult-to-cut materials are widely used in the shaft beam parts. In this process, there are many difficulties and problems that restrict the efficient machining of the shaft beam wing surface:
[0004] (2) On the CNC machine tool, the fixed-axis line cutting is used to process the curved surface. The bottom cutting edge of the tool cannot form a geometric mesh with the curved surface. There are local overcuts or undercuts on the surface of the curved surface. It is necessary to manually polish the surface of the curved surface by a fitter. The process

Method used

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  • End mill and rotating shaft beam airfoil hyperboloid milling method based on end mill
  • End mill and rotating shaft beam airfoil hyperboloid milling method based on end mill
  • End mill and rotating shaft beam airfoil hyperboloid milling method based on end mill

Examples

Experimental program
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Effect test

Embodiment 1

[0051] A kind of end milling cutter, comprises cutter bar and the end edge that is arranged on one end of cutter bar, such as Figure 4-Figure 8 As shown, the end edge is a concave structure, the end edge is provided with several cutting edges, and is provided with several helical side edges along the peripheral side, and the cutting edge includes a bottom edge in a concave arc structure, The gap between the bottom edge and the rotation plane of the bottom edge is H, and the two ends of the bottom edge are respectively connected to the helical side edge through arc segments.

[0052] Further, the end edge is provided with 14 cutting edges, and the end edge of the end mill 4 is provided with more cutting edges, so as to further improve the processing efficiency with the same feed rate per tooth.

[0053] Further, the bottom edge width B of the cutting edge is 0.6 mm to 0.8 mm, and H is 0.5 mm.

[0054] Further, the rake angle β of the end edge is 10°-12°, the relief angle γ of...

Embodiment 2

[0059] The milling method of the hyperboloid surface of the shaft beam airfoil based on the end mill 4 comprises the following steps:

[0060] Step S100: if image 3 As shown, the shaft beam part 3 is fixed on the workbench 1, so that the shaft beam wing surface is completely exposed and is in a machinable state;

[0061] Step S200: Roughly machining the airfoil of the rotating shaft beam, using an indexable milling cutter to perform rapid rough milling with a large margin, and roughly machining the airfoil of the rotating shaft beam into a trapezoidal small step surface;

[0062] Step S300: semi-finishing the airfoil of the shaft beam, using the end mill 4 to reciprocate the tool with a variable swing angle to semi-finish the surface with a large line spacing;

[0063] Step S400: finish machining the airfoil of the shaft beam, using an end mill with 4 large strokes to finish milling the profile in place.

[0064] In the present invention, the large-diameter fast-feed indexa...

Embodiment 3

[0066] This embodiment is optimized on the basis of Embodiment 2. In the step S200, when the indexable milling cutter has a large margin for rough milling, the depth of cut ap=0.8mm, the width of cut ae=65%D, and the linear speed Vc= 45m / min, feed per tooth fz=0.8mm / z.

[0067] Further, the indexable milling cutter in the step S200 has a diameter D≥50 mm, a base angle R≥1 mm, and a number of teeth Zn≥5.

[0068] Other parts of this embodiment are the same as those of Embodiment 2 above, so details are not repeated here.

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Abstract

The invention discloses an end mill and a rotating shaft beam airfoil hyperboloid milling method based on the end mill, the end mill is suitable for efficient machining and forming of small-curvature hyperboloids, and the radian of a contact point of a cutter and a material is increased in cutter bottom edge machining, so that the cutting line spacing can be increased; the problem that the row spacing is small when a large-R bull-nose milling cutter is used for machining a curved surface through a fixed shaft is effectively solved, the part machining efficiency is improved by times, and meanwhile, a large amount of manual polishing by bench workers is eliminated. When the curved surface of the wing surface of the rotating shaft beam is milled, under the condition that the cutting linear speed, the feeding amount per tooth and the cutting residual height are not changed, the cutting efficiency is improved by about 5 times compared with that of a five-tooth integral hard alloy milling cutter used in an original process, so that the part surface line cutting time is about 40 min; and meanwhile, the cutting surface quality is improved, the surface texture is uniform, smooth and free of sticky chips; and the size precision of the machined curved surface completely meets the inspection requirements, a large amount of manual polishing of bench workers is eliminated, and the practicability is good.

Description

technical field [0001] The invention belongs to the technical field of aviation precision manufacturing and processing, and in particular relates to an end mill and a hyperboloid milling method for a shaft beam wing surface based on the end mill. Background technique [0002] The complex rotating components on the aircraft not only have the high-precision characteristics of the rotating structure, but also have the characteristics of the complex structure of the non-rotating parts, and the size is large. The aircraft shaft beam is a typical complex rotary structure, and its parts are composed of a circular shaft section and a wing box section. The circular shaft section is mainly processed by turning technology, and the wing box section is mainly processed by milling technology. The airfoil surface of the wing box section is a typical hyperboloid, which is in the shape of a convex arc, such as figure 1 As shown, the curvature of the curved surface of the airfoil is small, b...

Claims

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Application Information

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IPC IPC(8): B23C3/00B23C5/00B23C5/02
CPCB23C3/00B23C5/00B23C5/02
Inventor 陈思涛李成华温良陈伟郑长军汪小东韩文强王鹏
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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