本文選題：微小孔　切入點：微鉆削　出處：《華北理工大學(xué)》2015年碩士論文

【摘要】：微鉆削是微小孔的主要加工方法,與常規(guī)孔鉆削相比微小孔鉆削在刀具結(jié)構(gòu)、鉆削機理等方面都有很大差異,微小孔鉆削技術(shù)的研究成為人們廣泛關(guān)注的焦點。以理論、仿真、試驗相結(jié)合的研究方式對微小孔鉆削的關(guān)鍵技術(shù)進行研究,具體內(nèi)容包括:1)通過對微小孔鉆削加工進行分析,得出微小孔鉆削特點:刀具細小,金屬切削模型需考慮刃口圓弧,存在最小切削厚度;刀具強度、剛度較差,使刀具折斷成為主要破損形式;刀具的心徑比大、無刃帶以增加刀具強度、剛度;高速鉆削下軸向力小,受刀具剛度、工件材料等影響徑向鉆削力不能相互抵消,成為主要鉆削力,徑向力也是導(dǎo)致刀具折斷的主要因素。2)通過對小尺寸麻花鉆的重要幾何參數(shù)進行分析,得出螺旋角、頂角、鉆心直徑這三個參數(shù)通過影響刀具的前角、橫刃長度、刃傾角等來間接影響刀具結(jié)構(gòu)和鉆削過程。通過正交仿真試驗做進一步分析、優(yōu)化,得到最優(yōu)刀具角度為螺旋角25°、頂角120°、鉆心直徑0.25mm。3)對鉆削參數(shù)進行分析,討論其對鉆削層厚度、鉆削面積等的影響,進而討論鉆削參數(shù)對鉆削力、扭矩、溫度、鉆頭磨損破損、切屑形狀、鉆孔質(zhì)量等因素的影響。研究表明,轉(zhuǎn)速越高越有利于微小孔鉆削;進給量越小,鉆削力、鉆削扭矩、鉆削溫度、磨損越小,鉆孔質(zhì)量越好,越有利于排屑;但進給量過小,接近最小切削厚度則會使鉆削力、扭矩、溫度增大,鉆頭磨損嚴重。采用特殊的建模方式對小尺寸麻花鉆三維模型和微小孔鉆削仿真模型進行創(chuàng)建,使刀具模型、鉆削模型更符合實際。最后對試驗結(jié)果與模擬結(jié)果進行對比,結(jié)果偏差12.06%,驗證了仿真模擬在微小孔鉆削研究中的有效性。
[Abstract]:Micro-drilling is the main machining method of micro-hole. Compared with conventional drilling, micro-hole drilling has great differences in cutting tool structure, drilling mechanism and so on. The research of micro-hole drilling technology has become the focus of widespread concern. The key technology of micro hole drilling is studied in combination of experiments. The specific contents include: 1) by analyzing the micro hole drilling, the characteristics of micro hole drilling are obtained: the cutting tool is small, the metal cutting model needs to consider the cutting edge arc, There is a minimum cutting thickness; the strength and stiffness of the cutting tool is poor, which makes the cutting tool fracture become the main form of breakage; the center diameter ratio of the tool is large and there is no edge band to increase the strength and stiffness of the tool; the axial force is small and the tool stiffness is affected by the cutting tool stiffness under the high speed drilling. The influence of workpiece material on radial drilling force can not be offset each other, become the main drilling force, radial force is also the main factor leading to the cutting tool break. 2) through the analysis of the important geometric parameters of small size twist drill, the helix angle and the top angle are obtained. These three parameters affect the cutting tool structure and drilling process indirectly by influencing the cutting tool's front angle, the length of the cutting edge, the angle of the edge inclination, and so on. The optimum tool angle is helix angle 25 擄, vertex angle 120 擄, drilling core diameter 0.25 mm 路3). The influence of drilling parameters on drilling layer thickness and drilling area is discussed. Furthermore, drilling parameters on drilling force, torque, temperature, bit wear and breakage are discussed. The research shows that the higher the rotational speed is, the better the drilling force, the torque, the temperature, the better the quality of drilling, the better the quality of drilling, and the better the quality of drilling. However, if the feed is too small, close to the minimum cutting thickness, the drilling force, torque and temperature will increase, and the bit wear will be serious. Finally, the experimental results are compared with the simulation results, and the deviation of the results is 12.06, which verifies the effectiveness of simulation in the research of micro-hole drilling.
【學(xué)位授予單位】：華北理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TG52

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相關(guān)期刊論文 前1條

1 馬玉平;向道輝;陳明;孫方宏;;微小孔加工試驗及刀具磨損機理[J];南京航空航天大學(xué)學(xué)報;2005年S1期

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本文編號：1654523