【摘要】：高溫合金具有優(yōu)良的熱強(qiáng)性能、熱穩(wěn)定性、耐腐蝕性和良好的工藝性,是制造火箭發(fā)動(dòng)機(jī)熱端部件的關(guān)鍵材料,在原子能、能源動(dòng)力、交通運(yùn)輸、石油化工和海水作業(yè)等方面也得到了廣泛的應(yīng)用。同時(shí)它也是一種典型的難加工材料,在加工過程中存在切削溫度高、加工硬化嚴(yán)重、刀具磨損嚴(yán)重、生產(chǎn)效率低的缺點(diǎn),在很大程度上制約了高溫合金的應(yīng)用。高速切削技術(shù)具有切削力小、工件熱變形小、材料去除率高的優(yōu)點(diǎn),目前已經(jīng)應(yīng)用于高溫合金的切削加工中。與傳統(tǒng)切削相比,高速切削雖然大幅提高了加工效率,但在實(shí)際的加工過程中仍然有很多問題需要解決。其中,切削液的大量使用,不僅提高了生成成本而且對(duì)環(huán)境的污染嚴(yán)重。因此,尋找一種代替切削液的高效冷卻潤滑方法是亟待解決的關(guān)鍵問題。為了實(shí)現(xiàn)高溫合金的綠色、高效制造,本論文采用復(fù)合噴霧冷卻技術(shù)對(duì)GH4169高溫合金進(jìn)行高速車削加工,對(duì)加工過程中各個(gè)參數(shù)下的刀具磨損形態(tài)進(jìn)行了分析研究,通過對(duì)比試驗(yàn)的方法研究了復(fù)合噴霧參數(shù)對(duì)刀具磨損量的影響規(guī)律。采用正交試驗(yàn)的方法研究了主要參數(shù)(水量V、油量Q、低溫氣體溫度T)對(duì)表面粗糙度的影響。結(jié)果表明:采用復(fù)合噴霧冷卻潤滑技術(shù)高速切削GH4169時(shí)片狀剝落是最主要的前刀面磨損形態(tài),后刀面的主要磨損形式是溝槽磨損;隨著油量Q的增大,刀具磨損量逐漸減小;隨著水量V的增大,刀具磨損量先減小后逐漸增大;隨著低溫氣體溫度T的降低,刀具磨損量先逐漸增大后減小;已加工表面粗糙度的值隨著油量的增大逐漸減小;隨著水量的增大先減小后逐漸增大,其中當(dāng)水量為25ml/h時(shí),粗糙度的值最小為0.67um;隨著低溫氣體溫度的降低先增大后減小,其中當(dāng)?shù)蜏貧怏w溫度為-55℃時(shí),粗糙度的值最小為0.596um;影響已加工表面粗糙度的主次因素為:低溫氣體的溫度T油量Q水量V;使已加工表面粗糙度的值達(dá)到最小的最優(yōu)參數(shù)配合為:油量7ml/h、水量25ml/h、低溫氣體的溫度-55℃;加工過程中有兩類紋理產(chǎn)生,與加工過程中刀具磨損和振動(dòng)的產(chǎn)生有關(guān)。
[Abstract]:Superalloys, with excellent thermal properties, thermal stability, corrosion resistance and good technological properties, are the key materials for manufacturing hot-end components of rocket engines in atomic energy, energy power, transportation, and so on. Petrochemical and seawater operations have also been widely used. At the same time, it is also a typical difficult-to-work material, which has the disadvantages of high cutting temperature, serious work hardening, serious tool wear and low production efficiency, which restricts the application of superalloy to a great extent. High-speed cutting technology has the advantages of small cutting force, small hot deformation and high material removal rate, so it has been applied in the cutting of superalloy at present. Compared with traditional cutting, high-speed cutting has greatly improved the machining efficiency, but there are still many problems to be solved in the actual machining process. The mass use of cutting fluid not only increases the production cost, but also pollutes the environment seriously. Therefore, the key problem to be solved is to find an efficient cooling lubrication method instead of cutting fluid. In order to realize the green and high efficiency manufacture of superalloy, the high-speed turning of GH4169 superalloy was carried out by using compound spray cooling technology, and the tool wear morphology under each parameter in the process of machining was analyzed and studied in this paper. The influence of composite spray parameters on tool wear was studied by means of comparative test. The influence of main parameters (water quantity V, oil quantity Q, low temperature gas temperature T) on surface roughness was studied by orthogonal test. The results show that flake spalling is the most important wear form in high speed cutting of GH4169, and groove wear is the main wear form of back tool face, and the wear amount of tool decreases gradually with the increase of oil quantity Q, and the wear loss of cutting tool decreases with the increase of oil quantity Q, and the wear rate of cutting tool decreases with the increase of oil quantity Q. With the increase of water volume V, the tool wear first decreases and then increases gradually, and with the decrease of low temperature gas temperature T, the tool wear first increases and then decreases, and the value of machined surface roughness decreases with the increase of oil quantity. With the increase of water content, the roughness decreases first and then increases gradually. When the water quantity is 25ml/h, the minimum roughness is 0.67um. When the temperature of low temperature gas is-55 鈩，

本文編號(hào)：2443329