Large length-to-diameter ratio ultra-high-speed rotating automatic dynamic balancing milling cutter shaft through material compensation

A technology of automatic dynamic balancing and large aspect ratio, applied in milling cutters, milling machine equipment, metal processing equipment, etc., can solve problems such as decreased processing efficiency, improve tool life, improve dynamic balancing performance, and achieve good automatic dynamic balancing effect. Effect

Active Publication Date: 2020-05-08
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for safety reasons, the use of milling cutters with large length-to-diameter ratios can generally only reduce their rotational speed to about 60% of the first critical speed, which will lead to a decrease in processing efficiency
[0003] To sum up, in the prior art, it is difficult to solve the problem of axis eccentricity of the milling cutter shaft under the condition of ensuring the processing efficiency for high-speed milling with a large length-to-diameter ratio, and to realize the automatic dynamic balance of the milling cutter shaft

Method used

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  • Large length-to-diameter ratio ultra-high-speed rotating automatic dynamic balancing milling cutter shaft through material compensation
  • Large length-to-diameter ratio ultra-high-speed rotating automatic dynamic balancing milling cutter shaft through material compensation
  • Large length-to-diameter ratio ultra-high-speed rotating automatic dynamic balancing milling cutter shaft through material compensation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A large length-to-diameter ratio ultra-high-speed rotating automatic dynamic balance milling cutter bar 2 through material compensation, including a milling tool holder 8 and a milling cutter head 11; one end of the tool holder is clamped by a machine tool spindle chuck, such as figure 2 , image 3 As shown, the milling cutter with a large length-to-diameter ratio will experience a considerable offset and bending deformation of the rotation axis 6 of the milling cutter under the condition of high-speed rotation. The eccentric axis of the milling cutter shown in the figure, the milling Manufacturing tolerances in the toolholder can also lead to uneven mass distribution around the axis of rotation. During the rotation of the milling cutter shaft, the original center of gravity O point shifts to the new center of gravity W point, which eventually leads to the overall displacement and bending of the milling cutter shaft. It is also this change that changes the deviation o...

Embodiment 2

[0050] The method of forming the hollow dynamic balance chamber in the present invention can also be to directly process a hollow dynamic balance chamber inside the milling tool holder, and then fill the hollow dynamic balance chamber with ultra-fine copper powder as a compensation material, This method may lead to a reduction in the strength of the tool holder. Therefore, the general condition for this method is that the hollow dynamic balance chamber can be directly processed inside the milling tool holder when the milling tool holder has sufficient strength.

[0051] The rest can be set with reference to Embodiment 1.

Embodiment 3

[0053] In the present invention, it is necessary to optimize the design of the compensation material and the special cavity structure to improve the automatic dynamic balance performance of the milling cutter bar, thus requiring related detection devices; Figure 4 As shown, through the relevant protection devices and testing instruments, the relevant parameters of the designed large length-to-diameter ratio automatic dynamic balance milling cutter bar are optimized under the condition of critical speed. The high-speed rotation of the milling cutter shaft is realized by using a high-speed CNC milling machine. In order to eliminate the excessive eccentricity and bending of the milling cutter shaft before accelerating to the critical speed, and prevent the sudden fracture of the milling cutter shaft, three protective bearings 3 are used to restrain the axis deflection of the milling cutter shaft within a certain range, and at the same time, it can ensure Free rotation of the mil...

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Abstract

The invention discloses a milling cutter spindle with a large draw ratio and capable of automatic dynamic balance during super-speed rotation through material compensation, and provides the milling cutter spindle with a special hollow dynamic balance cavity. By accommodating compensation material ultra-fine copper powder in the cavity, in short acceleration time, the compensation material is redistributed by means of centrifugal force generated by rotation, and a rotating axis around the milling cutter spindle is banded, so that the residual unbalance degree of the milling cutter spindle is reduced, fast automatic dynamic balance of the milling cutter spindle in a high-speed rotation process is effectively achieved, axis deviation of the milling cutter spindle is effectively avoided, the eccentric amplitude of the milling cutter spindle is reduced, and the dynamic balance performance of the milling cutter spindle is improved. The detection part mainly refers to a bearing balance protection and detection device which comprises a bearing, a measuring instrument, a collector, a clamp and the like, and optimization design can be conducted on the compensation material and the special cavity structure, so that the automatic dynamic balance performance of the milling cutter spindle is improved.

Description

technical field [0001] The invention relates to a cutting tool and a detection device thereof, in particular to a high-length-diameter-ratio ultra-high-speed rotating automatic dynamic balancing milling cutter bar and a detection device thereof through material compensation. Background technique [0002] At present, milling is widely used in the field of mechanical processing at home and abroad. Due to the particularity and complexity of the structure of some parts, it is necessary to use a milling cutter with a large length-to-diameter ratio to complete the corresponding milling work. Especially in typical aerospace parts, automotive engine box parts, and mold processing, milling cutters with large length-to-diameter ratios are often used to process deep cavities and complex surfaces. However, when the length-to-diameter ratio of the milling cutter exceeds 10, due to the overhang of the milling cutter, it will cause the milling cutter to eccentrically swing or bend when it...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23C5/26B23Q17/00
CPCB23C5/26B23Q17/00
Inventor 刘战强梁晓亮王兵宋清华任小平万熠
Owner SHANDONG UNIV
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