陶瓷微細加工過程中的刀具磨損研究
發(fā)布時間：2018-12-30 21:31
【摘要】：陶瓷材料具有高強度、高硬度、耐高溫、耐磨損、抗腐蝕等很多優(yōu)異性能,隨著微機電系統(tǒng)的發(fā)展,微小型零件需求的增加,陶瓷制品的應(yīng)用前景越來越廣泛。致密化燒結(jié)后的陶瓷坯體由于強硬度較高而難于加工,目前使用較廣泛的加工方法是特種加工如電火花加工、超聲波加工、激光加工等。但是其工藝復雜設(shè)備昂貴,快速成型方法的精度又比較低,同時陶瓷生坯直接加工由于強度較低又使其難以加工成型,嚴重影響所加工結(jié)構(gòu)的質(zhì)量。所以,尋找一種適合陶瓷材料加工的方法十分必要。本文在對陶瓷坯體預(yù)燒結(jié)的基礎(chǔ)上,使用三維銑削加工的方法獲得目標結(jié)構(gòu)。所謂的預(yù)燒結(jié)就是將陶瓷生坯在低于完全燒結(jié)的溫度下進行燒結(jié),使其具有一定的強度,便于切削加工的順利進行。利用線電極電火花磨削加工方法制備所需的微細刀具,編制數(shù)控加工程序,結(jié)合主軸的旋轉(zhuǎn)和進給運動能夠加工出不同截面形狀的刀具如半圓形、三角形、四邊形等,對預(yù)燒結(jié)陶瓷坯體進行三維微結(jié)構(gòu)加工。微細刀具的磨損對于銑削加工的進行以及微結(jié)構(gòu)的加工質(zhì)量有很大影響,所以研究刀具的磨損現(xiàn)象十分重要。在預(yù)燒結(jié)陶瓷坯體上進行了一系列的微型腔結(jié)構(gòu)的加工,研究了不同加工參數(shù)條件下,其中包括微細刀具的截面形狀、預(yù)燒結(jié)坯體的強度、銑削加工層厚、加工轉(zhuǎn)速以及加工速度等,微細刀具的磨損形態(tài)以及磨損量的大小,根據(jù)刀具的軸向和徑向磨損程度的大小以及所加工的微型腔的質(zhì)量選擇出適合此微細銑削加工的實驗參數(shù)。使用優(yōu)化的實驗加工參數(shù),加工了三種不同尺寸的微型腔,測量了加工過程中的加工間隙以及刀具的磨損量。加工間隙就是刀具與所加工微型腔側(cè)壁間的間隙。刀具的磨損量主要指軸向磨損量,刀具的磨損量由相對體積損耗率來衡量。在上述實驗結(jié)果的基礎(chǔ)上,計算得出該實驗條件下的加工間隙以及相對體積損耗率的大小,然后對所加工微型腔進行尺寸補償,獲得了較高的加工精度。研究結(jié)果表明,補償加工后的微型腔尺寸與目標尺寸十分接近,證明了補償方法的可行性。
[Abstract]:Ceramic materials have many excellent properties, such as high strength, high hardness, high temperature resistance, wear resistance, corrosion resistance and so on. With the development of micro electromechanical system and the increasing demand of micro parts, the application prospect of ceramic products is more and more extensive. It is difficult to process ceramic billet after densification and sintering because of its high hardness. At present, special machining methods such as EDM, ultrasonic machining and laser machining are widely used. However, the complex process equipment is expensive, the precision of rapid prototyping method is low, and the quality of the machined structure is seriously affected because of the low strength of ceramic blank and the difficulty of processing it. Therefore, it is necessary to find a suitable method for ceramic material processing. In this paper, the target structure is obtained by three dimensional milling on the basis of presintering of ceramic billet. The so-called pre-sintering is to sintered the raw ceramic billet under the temperature of complete sintering, so that it has a certain strength, which is convenient for the smooth processing of cutting. By using the method of wire electrode EDM, the micro cutting tools are prepared, and the NC machining program is compiled. Combined with the rotation and feed motion of the spindle, the cutting tools with different cross-section shapes such as semicircle, triangle, quadrangle and so on can be machined. The three-dimensional microstructure of pre-sintered ceramic billet was processed. The wear of micro cutting tools has great influence on the milling process and the machining quality of micro structure, so it is very important to study the wear phenomenon of cutting tools. A series of micro cavity structures were processed on the presintered ceramic billet. Under different processing parameters, including the cross section shape of fine cutting tool, the strength of presintered billet, the thickness of milling machining layer, the microstructure of presintered ceramic billet was studied. According to the axial and radial wear degree of the cutting tool and the quality of the micro-cavity, the experimental parameters suitable for the micro-milling machining are selected according to the machining speed and speed, the wear pattern and the wear amount of the micro-cutter. Three kinds of micro cavities with different sizes were machined with optimized experimental processing parameters. The machining clearance and tool wear were measured. Machining clearance is the gap between the cutting tool and the machined micro cavity side wall. Tool wear mainly refers to axial wear, and tool wear is measured by relative volume loss rate. On the basis of the above experimental results, the machining gap and the relative volume loss rate under the experimental conditions are calculated, and then the size compensation of the micro-cavity is carried out, and the higher machining accuracy is obtained. The results show that the size of the micro-cavity is very close to the target size, which proves the feasibility of the compensation method.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG71
[Abstract]:Ceramic materials have many excellent properties, such as high strength, high hardness, high temperature resistance, wear resistance, corrosion resistance and so on. With the development of micro electromechanical system and the increasing demand of micro parts, the application prospect of ceramic products is more and more extensive. It is difficult to process ceramic billet after densification and sintering because of its high hardness. At present, special machining methods such as EDM, ultrasonic machining and laser machining are widely used. However, the complex process equipment is expensive, the precision of rapid prototyping method is low, and the quality of the machined structure is seriously affected because of the low strength of ceramic blank and the difficulty of processing it. Therefore, it is necessary to find a suitable method for ceramic material processing. In this paper, the target structure is obtained by three dimensional milling on the basis of presintering of ceramic billet. The so-called pre-sintering is to sintered the raw ceramic billet under the temperature of complete sintering, so that it has a certain strength, which is convenient for the smooth processing of cutting. By using the method of wire electrode EDM, the micro cutting tools are prepared, and the NC machining program is compiled. Combined with the rotation and feed motion of the spindle, the cutting tools with different cross-section shapes such as semicircle, triangle, quadrangle and so on can be machined. The three-dimensional microstructure of pre-sintered ceramic billet was processed. The wear of micro cutting tools has great influence on the milling process and the machining quality of micro structure, so it is very important to study the wear phenomenon of cutting tools. A series of micro cavity structures were processed on the presintered ceramic billet. Under different processing parameters, including the cross section shape of fine cutting tool, the strength of presintered billet, the thickness of milling machining layer, the microstructure of presintered ceramic billet was studied. According to the axial and radial wear degree of the cutting tool and the quality of the micro-cavity, the experimental parameters suitable for the micro-milling machining are selected according to the machining speed and speed, the wear pattern and the wear amount of the micro-cutter. Three kinds of micro cavities with different sizes were machined with optimized experimental processing parameters. The machining clearance and tool wear were measured. Machining clearance is the gap between the cutting tool and the machined micro cavity side wall. Tool wear mainly refers to axial wear, and tool wear is measured by relative volume loss rate. On the basis of the above experimental results, the machining gap and the relative volume loss rate under the experimental conditions are calculated, and then the size compensation of the micro-cavity is carried out, and the higher machining accuracy is obtained. The results show that the size of the micro-cavity is very close to the target size, which proves the feasibility of the compensation method.
【學位授予單位】：大連理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG71
【共引文獻】
相關(guān)期刊論文 前4條
1 于化東;張留新;許金凱;于占江;;微小車床刀具磨損檢測方法[J];長春理工大學學報(自然科學版);2014年02期
2 周志雄;肖航;李偉;黃向明;;微細切削用微機床的研究現(xiàn)狀及發(fā)展趨勢[J];機械工程學報;2014年09期
3 李秋s，
本文編號：2396177
本文鏈接：http://sikaile.net/kejilunwen/jinshugongy/2396177.html
最近更新
教材專著
