發(fā)布時(shí)間：2018-09-11 14:27

【摘要】：SKD11模具鋼是一種國內(nèi)外廣泛應(yīng)用的冷作模具鋼,其工作過程中承受很高的沖擊載荷和疲勞應(yīng)力,對(duì)加工表面完整性、疲勞性能及摩擦磨損性能等提出了很高的要求;多軸數(shù)控銑削加工是目前廣泛應(yīng)用于航空、航天、模具等制造領(lǐng)域的高效加工方法。因此,研究多軸銑削加工工藝對(duì)SKD11模具鋼表面完整性、疲勞性能及摩擦磨損性能的影響規(guī)律,具有重要的理論及應(yīng)用價(jià)值。通過有限元仿真預(yù)測(cè)了典型零件沖壓模具的易失效區(qū)域,并通過模具加工和沖壓試驗(yàn)驗(yàn)證了仿真的可靠性,檢測(cè)了模具工作表面的粗糙度變化,研究了沖壓模具的失效機(jī)理。設(shè)計(jì)并進(jìn)行了多軸球頭高速銑削SKD11模具鋼的單因素切削試驗(yàn),研究了加工路徑、切削速度、徑向切深和每齒進(jìn)給量對(duì)加工表面表面粗糙度、表面殘余應(yīng)力及表面顯微硬度等加工表面完整性的影響規(guī)律�；诙噍S銑削試驗(yàn)設(shè)計(jì)了 SKD11模具鋼三點(diǎn)彎曲疲勞試驗(yàn),得到了不同加工參數(shù)下SKD11鋼樣條的疲勞壽命。研究了多軸銑削加工參數(shù)對(duì)SKD11鋼疲勞壽命的影響,結(jié)果表明,加工路徑對(duì)疲勞壽命具有重要的影響,當(dāng)表面加工路徑方向與表面受拉方向平行時(shí),能夠獲得較高的疲勞壽命;當(dāng)兩方向相互垂直時(shí),疲勞壽命最為不利;在不同的加工路徑中,各加工參數(shù)對(duì)疲勞壽命的影響規(guī)律不同。基于試驗(yàn)結(jié)果,提出了獲得高疲勞壽命的加工工藝方法。采用球-盤配合往復(fù)摩擦試驗(yàn),研究了不同加工參數(shù)下球頭銑削表面的摩擦系數(shù)和磨損量變化規(guī)律,結(jié)果表明:當(dāng)摩擦方向與加工路徑方向相互垂直時(shí)表面磨損量較小;當(dāng)兩方向成45°夾角時(shí),磨損量最大;不同的加工參數(shù)對(duì)摩擦系數(shù)的影響規(guī)律在不同的加工路徑中不同。
[Abstract]:SKD11 die steel is a kind of cold working die steel which is widely used at home and abroad. It bears high impact load and fatigue stress during its working process, which requires high surface integrity, fatigue performance and friction and wear performance. Multi-axis NC milling is widely used in aviation, aerospace, mold and other manufacturing fields. Therefore, it is of great theoretical and practical value to study the influence of multi-axis milling process on the surface integrity, fatigue properties and friction and wear properties of SKD11 die steel. The failure zone of stamping die for typical parts is predicted by finite element simulation. The reliability of simulation is verified by die processing and punching test. The change of working surface roughness of die is detected and the failure mechanism of stamping die is studied. The single factor cutting test of high speed milling SKD11 die steel with multi-axis ball head was carried out. The machining path, cutting speed, radial cutting depth and feed rate per tooth on the surface roughness were studied. Influence of surface residual stress and surface microhardness on surface integrity. The three-point bending fatigue test of SKD11 die steel is designed based on multi-axis milling test. The fatigue life of SKD11 steel spline under different processing parameters is obtained. The effect of multi-axis milling parameters on fatigue life of SKD11 steel is studied. The results show that the machining path has an important effect on fatigue life, and the higher fatigue life can be obtained when the direction of surface machining path is parallel to the direction of surface tension. When the two directions are perpendicular to each other, the fatigue life is the most disadvantageous, and in different machining paths, the influence of different processing parameters on fatigue life is different. Based on the experimental results, a process method for obtaining high fatigue life is proposed. The variation of friction coefficient and wear amount of milling surface under different machining parameters was studied by using ball disk and reciprocating friction test. The results show that the surface wear amount is smaller when the friction direction and the machining path direction are perpendicular to each other. When the angle between the two directions is 45 擄, the wear rate is the largest, and the influence of different machining parameters on the friction coefficient is different in different machining paths.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG547;TG142.1

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本文編號(hào)：2236956