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Method for improving milling stability domain of titanium alloy thin-walled workpiece

A technology for titanium alloy and thin-walled parts is applied in the field of improving the milling stability field of titanium alloy thin-walled parts, which can solve the problems of insufficient theoretical research, and it is difficult to completely separate the tool and the workpiece.

Inactive Publication Date: 2020-05-19
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, the analysis of the stability of non-separable ultrasonic machining is still in its infancy, and the theoretical research is not deep enough.
Especially for milling, since the ultrasonic amplitude is much smaller than the theoretical depth of cut, it is difficult to completely separate the tool from the workpiece during actual processing

Method used

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  • Method for improving milling stability domain of titanium alloy thin-walled workpiece
  • Method for improving milling stability domain of titanium alloy thin-walled workpiece
  • Method for improving milling stability domain of titanium alloy thin-walled workpiece

Examples

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Embodiment 1

[0222] In this example, the MCV-L850 machining center is used to study the influence of rotary ultrasonic machining technology on the milling stability domain of milling titanium alloy thin-walled plates. The schematic diagram of the structure is as follows image 3 shown. The overall size of the titanium alloy web is 215 mm × 145 mm × 3 mm. The tool used in the milling experiment is a three-tooth carbide end mill with a diameter of 8 mm and a helix angle of 35°. From the milling force measured by the slot milling experiment, the average milling force coefficient of the cemented carbide cutter with no ultrasonic milling titanium alloy web is obtained, as shown in Table 1. The processing parameters (feed speed, depth of cut, etc.) of titanium alloy thin-walled parts are generally small. Therefore, the effects of material removal and tool position changes on machining stability during milling of titanium alloy webs are ignored. The specific modal parameters are obtained by ANA...

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Abstract

The invention discloses a method for improving a milling stability domain of a titanium alloy thin-walled workpiece. The method comprises the following steps: step 1, establishing a kinetic equivalentmodel of a rotary ultrasonic milling system of the titanium alloy web thin-walled workpiece; step 2, determining modal characteristics of the milling system for the weak-rigidity titanium alloy thin-walled workpiece; 3, establishing a rotary ultrasonic milling dynamic milling force model; step 4, constructing a rotary ultrasonic milling titanium alloy web thin-wall part stability domain analytical model; 5, solving the stability domain of the rotary ultrasonic milling titanium alloy thin-walled workpiece by using a semi-discrete method; and step 6, drawing a stability lobe diagram of the rotary ultrasonic milling titanium alloy thin-walled workpiece to realize accurate prediction of the stability domain of the titanium alloy thin-walled workpiece. According to the method, the titanium alloy thin-wall part is milled through the rotary ultrasonic technology, the stability range of milling of the titanium alloy web is greatly improved, milling flutter is obviously restrained, and the milling quality of the titanium alloy web is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of special processing, and in particular relates to a method for improving the milling stability range of titanium alloy thin-walled parts. Background technique [0002] Titanium alloy has high strength, good heat resistance and corrosion resistance, and is widely used in the aerospace field. Thin-walled parts with complex shapes and structures are widely used in this industry. The cross-sectional size of such thin-walled parts is small, the allowance is large during processing, and the processing technology is poor. Due to the weak rigidity of thin-walled parts, it is easy to cause deformation and vibration during processing, which makes obvious vibration marks on the processed surface, thus greatly reducing the processing quality of thin-walled parts. In addition, machining chatter will reduce the dimensional accuracy of the workpiece, reduce the service life of the tool, and damage the machine in severe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/17G06F30/23G06T17/00G06F111/10G06F119/14
CPCG06T17/00
Inventor 孙连军郑侃孙红伟薛枫束静
Owner NANJING UNIV OF SCI & TECH
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