本文關(guān)鍵詞：Ti6Al4V的電火花線切割加工參數(shù)及工藝研究　出處：《太原理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： Ti6Al4V WEDM 多因素 曲面響應(yīng) 電加工參數(shù)

【摘要】：伴隨工業(yè)領(lǐng)域的逐漸發(fā)展,實(shí)際應(yīng)用中對(duì)產(chǎn)品性能要求的不斷提高,工業(yè)產(chǎn)品所采用的材料也愈加受到關(guān)注,而Ti6Al4V(簡稱TC4)自起誕生之日起,就因其優(yōu)秀的性能而備受科學(xué)界關(guān)注,也不斷地應(yīng)用于航空、運(yùn)輸、藝術(shù)、采油、冶煉、船舶、電力裝備等多個(gè)重要領(lǐng)域。由于鈦合金較高的比強(qiáng)度與熱穩(wěn)定性,和較低的導(dǎo)熱系數(shù),較小的彈性模量等原因,利用車削銑削等傳統(tǒng)加工手段對(duì)Ti6Al4V進(jìn)行加工時(shí),切削刃附近的產(chǎn)熱大且散熱慢,極易造成刀具與材料的粘連以及刀具的損壞。而屬于電加工范疇的電火花線切割(WEDM)加工,切割過程中電極絲和被加工材料不接觸,能夠減少部分刀具損壞的問題。從而研究WEDM加工Ti6Al4V中的部分電參數(shù)以及其工藝參數(shù)對(duì)材料的影響就較有價(jià)值。本文面向WEDM電參數(shù)與工藝參數(shù)進(jìn)行了以下研究:(1)通過多因素序貫實(shí)驗(yàn)中常用的最陡坡度法,尋找一組出色的電參數(shù)組合以滿足對(duì)加工TC4合金性能指標(biāo)要求,分別考慮WEDM的電參數(shù)對(duì)材料去除率MRR以及表面粗糙度值Ra的影響,并尋找到對(duì)應(yīng)于各個(gè)目標(biāo)的最優(yōu)試點(diǎn),即最優(yōu)參數(shù)組合。但是若只一考量其中一個(gè)目標(biāo),則通過參數(shù)的改變提高其中一個(gè)目標(biāo)時(shí)常常會(huì)導(dǎo)致另一個(gè)目標(biāo)值的下降,而加工中往往需要綜合考量上述兩目標(biāo),故結(jié)合灰色關(guān)聯(lián)分析的方法,將不同參數(shù)下對(duì)應(yīng)的材料去除率MRR與表面粗糙度值Ra的關(guān)聯(lián)度值相加,從而得到綜合性能最好的一組電參數(shù)值。(2)通過曲面響應(yīng)方法分析驗(yàn)證各電參數(shù)對(duì)材料去除率及表面粗糙度值影響關(guān)系,結(jié)合軟件對(duì)加工參數(shù)對(duì)材料去除率以及表面粗糙度值的影響加以預(yù)測分析并將結(jié)果公式化,從而優(yōu)化電參數(shù)組合,并在實(shí)際應(yīng)用將所得到的最優(yōu)電參數(shù)組合輸入到工控機(jī)的操作系統(tǒng)中,從而始加工所得Ti6Al4V材料達(dá)到較為出色的綜合性能。(3)從工藝的角度研究了電火花線切割錐度切割功能,為研究上述問題,本文采取了單因素結(jié)合AHP分析,以及正交實(shí)驗(yàn)的方法,對(duì)WEDM的各個(gè)電參數(shù)及非電參數(shù)對(duì)材料去除率以及表面粗糙度值的影響進(jìn)行了試驗(yàn)分析,其中電參數(shù)包括對(duì)材料去除率影響較大的峰值電流與脈沖寬度,非電參數(shù)包括切割方向以及切割角度(錐度),而快走絲電火花線切割機(jī)床錐度加工的切割角度只能在-3°至3°之間(實(shí)際測量為-2°58′至2°59′)。通過研究分析得出影響錐度加工材料去除率以及表面粗糙度的主要因素及影響顯著程度。(4)通過ANSYSWORKBENCH模擬仿真放電加工產(chǎn)熱的過程結(jié)合前人研究說明了在電加工條件下,放電通道半徑的大小直接關(guān)系到材料的粗糙度值大小,結(jié)合放電通道半徑的經(jīng)驗(yàn)公式可以分析出影響表面粗糙度的兩個(gè)最為重要的因素,并且通過利用掃描電鏡觀測各參數(shù)變化對(duì)變質(zhì)層的影響。
[Abstract]:With the gradual development of the industrial field and the continuous improvement of product performance requirements in practical applications, the materials used in industrial products have been paid more and more attention. Ti6Al4V (abbreviated as TC4) has been concerned by the scientific community for its excellent performance since its birth, and has been continuously applied in aviation, transportation, art, oil extraction, smelting and shipping. Because of the higher specific strength and thermal stability of titanium alloy, the lower thermal conductivity and the lower elastic modulus, etc. When Ti6Al4V is processed by turning and milling, the heat production near the cutting edge is large and the heat dissipation is slow. It is easy to cause adhesion of cutting tools and materials and damage of tools. WEDM, which belongs to the category of electrical machining, does not contact electrode wire and processed materials in the process of cutting. It is valuable to study some electrical parameters in WEDM machining Ti6Al4V and the influence of process parameters on the material. This paper is oriented to the electrical parameters and engineering of WEDM. The following studies were carried out on the art parameters:. (. The main results are as follows: 1) the steepest gradient method is commonly used in sequential experiments. To find an excellent combination of electrical parameters to meet the requirements of the mechanical properties of TC4 alloys, the effects of electrical parameters of WEDM on the material removal rate (MRR) and surface roughness value Ra were considered respectively. And find the optimal pilot corresponding to each goal, that is, the optimal combination of parameters. But if only one of the objectives is considered. The improvement of one of the targets by changing the parameters often leads to the decrease of the value of the other target, and the two targets need to be considered comprehensively in the process, so the method of grey correlation analysis is combined. The correlation value between the material removal rate (MRR) and the surface roughness value (Ra) is added under different parameters. A group of electrical parameters, which have the best comprehensive performance, is obtained. The surface response method is used to verify the relationship between the electrical parameters and the material removal rate and the surface roughness value. The influence of machining parameters on material removal rate and surface roughness value is predicted and analyzed with software, and the results are formulated to optimize the combination of electrical parameters. The optimal electrical parameters are input into the operating system of the industrial control computer in practical application. Thus, the Ti6Al4V material obtained from the process has achieved excellent comprehensive properties. (3) the taper cutting function of WEDM has been studied from the point of view of technology, in order to study the above problems. In this paper, single factor AHP analysis and orthogonal experiment were used to analyze the effect of WEDM's electrical and non-electrical parameters on the material removal rate and surface roughness value. The electrical parameters include the peak current and pulse width which have great influence on the material removal rate, and the non-electric parameters include the cutting direction and the cutting angle (taper). The angle of taper machining of WEDM can only be between 3 擄and 3 擄(actual measurement is 2 擄58'to 2 擄59 擄). The main factors affecting the removal rate and surface roughness of taper machining materials and the degree of significance are obtained by means of research and analysis. The heat production process of electric discharge machining is simulated by ANSYSWORKBENCH and the former research shows that under the condition of electromachining. The magnitude of the discharge channel radius is directly related to the roughness value of the material. The two most important factors affecting the surface roughness can be analyzed by combining the empirical formula of the discharge channel radius. The influence of various parameters on the metamorphic layer was observed by scanning electron microscope (SEM).
【學(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG484

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本文編號(hào)：1439961