鈦合金弱剛性結(jié)構(gòu)件銑削加工穩(wěn)定性研究

1、南京航空航天大學(xué)碩士學(xué)位論文鈦合金弱剛性結(jié)構(gòu)件銑削加工穩(wěn)定性研究姓名：路遠(yuǎn)東申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：航空宇航制造工程指導(dǎo)教師：劉長(zhǎng)毅2011-01鈦合金弱剛性結(jié)構(gòu)件銑削加工穩(wěn)定性研究 ii ABSTRACT Chatter vibration is a significant problem in milling, once happening, the milling system will be unstable. The surf

2、ace finish becomes worse because of the sharply changing force and the cutter or machine spindle may be damaged. The traditional model of stability prediction has good performance in the range of linearity, such as turni

3、ng and milling with large radial depth of cutting. But if the radial depth of cutting is small, it tends to lose accuracy. Basing on the process designing and optimization of milling a titanium alloy weak rigid part; the

4、 model of stability prediction of small radial depth of cutting is researched. The main work of this article is listed as follows: 1. The process character of the part is analyzed. Its modal information and deformation

5、under milling force is acquired by finite method. The difficulties of machining the weak rigid part are analyzed and we find an effective way to produce it with several available processing methods. 2. Establishing the

6、milling force model basing on the cutting coefficient model. Coefficients are acquired by machinability test of titanium alloy material ZTC4 which are supportive data for the stability prediction. Meanwhile, according to

7、 the test we acquired meaningful information such as cutting force, cutting temperature and surface roughness. The influence of basic machine parameters to milling titanium alloy is analyzed which can be a reference for

8、the following process designing and optimization. 3. According to available research result about mechanism of chatter vibration and stability prediction, we established a dynamic model of milling. The stability domain

9、which appears to be in the shape of lobes is acquired basing on the generalized model of stability prediction. The influence of each factor to stability lobe is analyzed. The model of stability prediction of milling with

10、 small radial depth of cutting is established. 4. With the machinability experiment of the material ZTC4 and engineering test of the target part, the final surface quality and position tolerance reach the designning req

11、uirements, which proves the effectiveness of the stability prediction model. Both from the theory and experiment aspect, we made research about the machinability of material ZTC4, processing character and the mechanism o