Rapid predication method for variable-helix milling cutter

A prediction method and technology of stability, applied in the field of parts processing and manufacturing, can solve problems such as poor engineering applicability, and achieve the effects of improving processing efficiency, reducing stability area prediction, and reducing selection time.

Inactive Publication Date: 2017-03-29
TIANJIN AEROSPACE CHANGZHENG ROCKET MFGCO +2
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

Taking the variable helix milling cutter with good vibration suppression performance as the research goal, aiming at the shortcomings of the existing methods for predicting the cutting stability of this type of milling cutter, such as poor engineering applicability, an effici

Method used

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  • Rapid predication method for variable-helix milling cutter
  • Rapid predication method for variable-helix milling cutter
  • Rapid predication method for variable-helix milling cutter

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Experimental program
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Embodiment Construction

[0022] Step 1: In the range of 10-3600 degrees, with limited wavelength α l ， j = 5 degrees as an increment, scan the flutter wavelength α l ， j ;

[0023] Step 2: Select the dither frequency ω near the dominant mode c ;

[0024] Considering the flutter wavelength α l ， j Calculation formula

[0025]

[0026] Among them, k l ， j is the number of lobes, ε l ， j is the phase shift of the cutting surface. When only the first tooth is considered, substitute the obtained wavelength and chatter frequency into the following formula to obtain the spindle speed

[0027]

[0028] Step 3: Substitute the obtained rotational speed and other variables into the formula to obtain the limit cutting depth.

[0029] (1) Due to the variable helical characteristics of the teeth, the tooth body is sliced ​​along the length direction, and the corresponding inter-tooth angle of each slice can be expressed as:

[0030]

[0031] Among them, M is the axial discrete fraction, ...

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Abstract

The invention brings forward a rapid predication method for a variable-helix milling cutter. The method comprises following steps: selecting limited wavelength and wavelength as the increment and scanning flutter wavelength within the rotating circular period of the cutter; selecting flutter frequency nearby a master mode on the basis of obtaining the mode feature of a spindle system and obtaining spindle rotation speed by calculating flutter wavelength based on flutter frequency; obtaining extreme cutting depth based on variables including spindle rotation speed; keeping cutting depth value and spindle rotation speed if the real part of the cutting depth is the positive number and the imaginary part is zero and circularly scanning flutter wavelength; continuing to scan flutter frequency if the real part of the cutting depth is the negative number and discarded; and finally obtaining data points including spindle rotation speed and extreme cutting depth after finishing scanning and drawing a stability lobe diagram. The rapid predication method for the variable-helix milling cutter has following beneficial effects: the problem of the conventional time-domain method such as a large number of null points is solved so that calculation efficiency is not low; and at the same time, a stability region for a cutting process of the variable-helix milling cutter can be rapidly obtained.

Description

technical field [0001] The invention belongs to parts processing and manufacturing technology, and in particular relates to a method for quickly predicting the stability of a variable helix milling cutter cutting process. [0002] Background technique: [0003] As an advanced processing technology, milling is widely used in the fields of aviation, aerospace, ships, molds and automobiles. This field requires the removal of large amounts of metal material from metal structures with high efficiency and precision in the machining process. Milling chatter is a self-excited vibration phenomenon that occurs during the machining process. This phenomenon aggravates tool wear, reduces the service life of the machining center, reduces the machining accuracy of the workpiece surface, and seriously restricts the efficiency of the machining center. As a better passive control method for chatter stability, the research on the cutting stability of variable helix milling cutter is to optimiz...

Claims

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Application Information

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IPC IPC(8): B23Q17/09B23Q17/10
CPCB23Q17/0971B23Q17/10
Inventor 郑骥靳刚葛佳李国和蔡玉俊戚厚军吴远志
Owner TIANJIN AEROSPACE CHANGZHENG ROCKET MFGCO
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