本文選題：鋁合金 + 電弧快速成形　； 參考：《北京石油化工學(xué)院》2017年碩士論文

【摘要】：電弧快速成形技術(shù)以電弧為熱源將金屬絲材熔化,可以快速成形致密度高、力學(xué)性能好的復(fù)雜結(jié)構(gòu)件。相比高能束快速成形,電弧快速成形具有成形設(shè)備簡(jiǎn)單、成本低、效率高、成形質(zhì)量好等優(yōu)點(diǎn),但成形件表面粗糙,通過改善工藝參數(shù)及成形方法來提高成形質(zhì)量表現(xiàn)出了很大的研究空間。本文以5356鋁合金焊絲為成形材料,基于MIG焊接進(jìn)行鋁合金快速成形試驗(yàn),研究不同工藝參數(shù)對(duì)單層及多層成形下成形件成形質(zhì)量的影響規(guī)律,并對(duì)側(cè)壁成形方式進(jìn)行了探索研究。焊接電流和成形速度是影響成形質(zhì)量的主要因素,適當(dāng)?shù)念A(yù)熱有助于焊道的成形。通過單層單道成形試驗(yàn),測(cè)量不同焊接電流、成形速度及預(yù)熱溫度下焊道熔寬及余高,分析總結(jié)各工藝參數(shù)對(duì)單層單道成形質(zhì)量的影響規(guī)律。根據(jù)快速成形軌跡理想模型,以典型薄壁件成形方式為例,進(jìn)行多層單道成形試驗(yàn)研究,分析不同焊接電流、成形速度及層間冷卻時(shí)間對(duì)薄壁件宏觀尺寸及表面粗糙度的影響規(guī)律,并對(duì)成形試樣進(jìn)行微觀組織及力學(xué)性能的檢測(cè)。在理想搭接狀態(tài)模型的基礎(chǔ)上,利用單層單道及多層單道的試驗(yàn)結(jié)果,探索四種不同側(cè)壁成形方式對(duì)試樣表面成形質(zhì)量的影響規(guī)律,通過成形試樣平整度及表面粗糙度判定成形效果,獲得側(cè)壁成形的最優(yōu)方法。
[Abstract]:Arc rapid prototyping technology uses arc as heat source to melt metal wire, which can rapidly form complex structure with high density and good mechanical properties. Compared with high energy beam rapid prototyping, arc rapid prototyping has the advantages of simple forming equipment, low cost, high efficiency and good forming quality. By improving the process parameters and forming methods to improve the quality of forming shows a lot of research space. In this paper, 5356 aluminum alloy wire is used as the forming material, and the rapid prototyping test of aluminum alloy based on MIG welding is carried out. The influence of different process parameters on the forming quality of the forming parts under single-layer and multi-layer forming is studied. The sidewall forming method is also studied. Welding current and forming speed are the main factors affecting forming quality. The weld width and residual height were measured under different welding current, forming speed and preheating temperature by single pass forming test. The influence of process parameters on single pass forming quality was analyzed and summarized. According to the ideal model of rapid prototyping trajectory, taking typical thin-walled parts as an example, the multi-layer single-pass forming test was carried out, and the different welding currents were analyzed. The effects of forming speed and interlaminar cooling time on the macroscopic size and surface roughness of thin-walled parts were studied. The microstructure and mechanical properties of the formed specimens were examined. Based on the ideal lap state model, the effects of four different sidewall forming methods on the surface forming quality of the specimens are explored by using the experimental results of single-layer single-pass and multi-layer single-pass. The optimum method of sidewall forming is obtained by judging the forming effect by the flatness and surface roughness of the forming specimen.
【學(xué)位授予單位】：北京石油化工學(xué)院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG444.74

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