金屬板料單點(diǎn)漸進(jìn)成形性能研究
發(fā)布時(shí)間：2018-08-30 13:14
【摘要】：金屬板料單點(diǎn)漸進(jìn)成形技術(shù)是一種新型的柔性無模成形技術(shù),適合于多品種、小批量產(chǎn)品的新品種研發(fā)與制造,對(duì)于汽車、航空航天、家用電器、醫(yī)療器械等領(lǐng)域具有十分廣闊的應(yīng)用前景。在漸進(jìn)成形實(shí)際生產(chǎn)中,許多工藝參數(shù)的選擇影響著成形件的質(zhì)量,解決漸進(jìn)成形缺陷還需要對(duì)漸進(jìn)成形機(jī)理做進(jìn)一步深入研究。本文基于ANSYS/LS-DYNA有限元軟件,建立起適合板料單點(diǎn)漸進(jìn)成形的數(shù)值模擬分析模型,通過漸進(jìn)成形截頭錐形件分析單點(diǎn)漸進(jìn)成形機(jī)理,并且數(shù)值模擬與試驗(yàn)綜合探究工藝參數(shù)對(duì)板料的單點(diǎn)漸進(jìn)成形性能的影響規(guī)律。主要的工作內(nèi)容如下：1)在Matlab環(huán)境下編程運(yùn)行GUI程序成功解決了復(fù)雜成形軌跡加載的難題,實(shí)現(xiàn)了對(duì)單點(diǎn)漸進(jìn)成形完整的模擬過程。2)從應(yīng)力狀態(tài)、應(yīng)變狀態(tài)以及厚度分布幾個(gè)方面分析了單點(diǎn)漸進(jìn)成形機(jī)理,結(jié)論顯示：①正在成形區(qū)的所有單元屬于三向應(yīng)力狀態(tài),兩拉一壓；②應(yīng)變狀態(tài)與成形區(qū)域和成形路徑有關(guān)。圓形路徑加載時(shí),微小變形區(qū)為壓縮類變形,過渡變形區(qū)為壓縮類變形和剪切類變形的混合,均勻變形區(qū)和正在變形區(qū)為純剪切類變形；直線路徑加載時(shí),所有的變形區(qū)均為壓縮類變形；③單點(diǎn)漸進(jìn)成形件的厚度分布余弦定理只適用于過渡變形區(qū)后半段、均勻變形區(qū)和正在變形區(qū)。3)數(shù)值模擬與試驗(yàn)驗(yàn)證研究了原始板厚、垂直增量步長以及零件形狀對(duì)金屬板料單點(diǎn)漸進(jìn)成形性能的影響規(guī)律,并試驗(yàn)探究漸進(jìn)成形過程中潤滑劑的選擇。結(jié)果顯示：由于成形工具頭與板料的磨損,薄板的變形區(qū)厚度就相對(duì)于厚板變得更�。捍怪痹隽坎介L太小或者太大都不利于漸進(jìn)成形,太小不會(huì)引起溫度效應(yīng)使金屬發(fā)生回復(fù)與再結(jié)晶,太大導(dǎo)致變形的不均勻傾向和摩擦力的增大；相比圓錐臺(tái),方錐臺(tái)的平均應(yīng)變量更小,變形更均勻,厚度減薄情況也得到了改善；采用極壓添加劑的潤滑脂作為漸進(jìn)成形的潤滑劑,耐壓性高,粘附性好,潤滑效果理想。
[Abstract]:Single point incremental forming of sheet metal is a new type of flexible die forming technology, which is suitable for the research and manufacture of many kinds and small quantities of products, such as automobile, aerospace, household appliances, etc. Medical devices and other fields have a very broad application prospects. In the practical production of incremental forming, the selection of many process parameters affects the quality of forming parts. To solve the defects of incremental forming, it is necessary to further study the mechanism of incremental forming. Based on ANSYS/LS-DYNA finite element software, a numerical simulation analysis model suitable for sheet metal single point progressive forming is established in this paper. The influence of process parameters on single point incremental forming performance of sheet metal was investigated by numerical simulation and test. The main work is as follows: (1) programming and running GUI program under Matlab environment successfully solves the difficult problem of complex forming trajectory loading, and realizes the complete simulation process of single point progressive forming process .2) from stress state. The mechanism of single point progressive forming is analyzed in terms of strain state and thickness distribution. It is concluded that all the elements in the forming zone of 1 / 1 are in a three direction stress state, and the strain state of two drawing and pressing is related to the forming region and forming path. When the circular path is loaded, the small deformation zone is compression-like deformation, the transition deformation zone is a mixture of compression-like deformation and shear-like deformation, and the uniform deformation zone and the current deformation zone are pure shear-like deformation. The thickness distribution cosine theorem of all the deformation regions is compression-like deformation-3 single-point progressive forming parts. The CoSine theorem is only applicable to the second half of the transition deformation zone, the uniform deformation zone and the in-process deformation zone .3) numerical simulation and experimental results show that the original plate thickness is studied. The influence of vertical incremental step size and part shape on sheet metal single point progressive forming performance was studied. The selection of lubricant in incremental forming process was investigated. The results show that due to the wear of the forming tool head and sheet metal, the thickness of the deformation zone of the sheet becomes thinner than that of the thick plate, and the vertical incremental step is too small or too large to be conducive to progressive forming. Too small does not cause temperature effect to cause recovery and recrystallization of the metal, and too much leads to the uneven tendency of deformation and the increase of friction; compared with the cone table, the average strain of the square cone is smaller and the deformation is more uniform. The thickness thinning is also improved, and the lubricating grease with extreme pressure additive is used as the lubricant of progressive forming, which has high pressure resistance, good adhesion and ideal lubricating effect.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TG306
[Abstract]:Single point incremental forming of sheet metal is a new type of flexible die forming technology, which is suitable for the research and manufacture of many kinds and small quantities of products, such as automobile, aerospace, household appliances, etc. Medical devices and other fields have a very broad application prospects. In the practical production of incremental forming, the selection of many process parameters affects the quality of forming parts. To solve the defects of incremental forming, it is necessary to further study the mechanism of incremental forming. Based on ANSYS/LS-DYNA finite element software, a numerical simulation analysis model suitable for sheet metal single point progressive forming is established in this paper. The influence of process parameters on single point incremental forming performance of sheet metal was investigated by numerical simulation and test. The main work is as follows: (1) programming and running GUI program under Matlab environment successfully solves the difficult problem of complex forming trajectory loading, and realizes the complete simulation process of single point progressive forming process .2) from stress state. The mechanism of single point progressive forming is analyzed in terms of strain state and thickness distribution. It is concluded that all the elements in the forming zone of 1 / 1 are in a three direction stress state, and the strain state of two drawing and pressing is related to the forming region and forming path. When the circular path is loaded, the small deformation zone is compression-like deformation, the transition deformation zone is a mixture of compression-like deformation and shear-like deformation, and the uniform deformation zone and the current deformation zone are pure shear-like deformation. The thickness distribution cosine theorem of all the deformation regions is compression-like deformation-3 single-point progressive forming parts. The CoSine theorem is only applicable to the second half of the transition deformation zone, the uniform deformation zone and the in-process deformation zone .3) numerical simulation and experimental results show that the original plate thickness is studied. The influence of vertical incremental step size and part shape on sheet metal single point progressive forming performance was studied. The selection of lubricant in incremental forming process was investigated. The results show that due to the wear of the forming tool head and sheet metal, the thickness of the deformation zone of the sheet becomes thinner than that of the thick plate, and the vertical incremental step is too small or too large to be conducive to progressive forming. Too small does not cause temperature effect to cause recovery and recrystallization of the metal, and too much leads to the uneven tendency of deformation and the increase of friction; compared with the cone table, the average strain of the square cone is smaller and the deformation is more uniform. The thickness thinning is also improved, and the lubricating grease with extreme pressure additive is used as the lubricant of progressive forming, which has high pressure resistance, good adhesion and ideal lubricating effect.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TG306
【相似文獻(xiàn)】
相關(guān)期刊論文 前10條
1 洪慎章,曾振鵬;提高金屬成形性的研究[J];模具技術(shù);2000年05期
2 關(guān)小軍,高鵬,王作成,劉清津,馬t，
本文編號(hào)：2213178
本文鏈接：http://sikaile.net/kejilunwen/jiagonggongyi/2213178.html
最近更新
教材專著
