shrinkage porosity 中文意思是什麼
shrinkage porosity
解釋
收縮孔隙度-
Shrinkage / porosity is a common defect in castings and one of main causes making products waste
縮孔縮松是鑄件常見的缺陷，是產生廢品的主要原因之一。 -
The ultimate aim of the numerical simulation on temperature field in castings solidification process is for eliminating shrinkage / porosity or limiting them within the user ' s permission
鑄件凝固過程溫度場數值模擬為最終消除縮孔縮松缺陷或將其限制在用戶允許的范圍內，以獲得質量合格的產品提供了非常有效的手段。 -
The key to prediction of casting shrinkage / porosity lies in ascertaining the critical value of temperature gradient and niyama criterion. the thesis put forward two methods to ascertain the value, one is which is positive - direction and the other is negative - direction. we verify the realistic arithmetic of temperature gradient method and niyama criterion method by experiment, and we can draw a conclusion that the arithmetic is correct and reasonable in most cases and choice of developing tool is sound
臨界梯度值和新山判據臨界值的確定是實現縮孔縮松預測的關鍵，本文提出了確定臨界值的正向法和反向法，並以高鉻鑄鐵件縮孔縮松預測和鑄造工藝改進為研究對象，應用正向法，確定了溫度梯度法的臨界值為180 m 。 -
On the basic of the detailed analysis on main causes and main prediction methods of casting shrinkage / porosity, we put forward two methods to describe the solid phase rate of materials solidification. one is liner - distributing method, and the other is parabola - distributing method. and then, we apply the former to the system
本文在充分分析鑄件縮孔縮松產生機理與主要預測方法的基礎上，提出了材料凝固固相率的線性分佈法和拋物線分佈法，並將前者應用於系統中；同時提出了溫度梯度法和新山判據法的實現演算法，此演算法具有一定的靈活性。 -
Temperature field of hollow ingot solidification is simulated by fem. to different mould, effect of heat transfer coefficient between inner sleeve and cooling medium and thickness of core refractory on final position of solidification, the highest temperature of inner sleeve against cooling medium, and shrinkage cavity and porosity are compared. in addition, change of temperature in typical position of core refractory is also compared
對空心鋼錠凝固過程的溫度場進行了有限元分析，對不同錠型結構的芯部換熱系數、耐火材料厚度對最終凝固位置、內筒壁最高溫度及縮孔疏鬆的影響進行了對比，並討論了耐火材料典型部位的溫度隨凝固時間的變化。 -
Abstract : temperature field of hollow ingot solidification is simulated by fem. to different mould, effect of heat transfer coefficient between inner sleeve and cooling medium and thickness of core refractory on final position of solidification, the highest temperature of inner sleeve against cooling medium, and shrinkage cavity and porosity are compared. in addition, change of temperature in typical position of core refractory is also compared
文摘:對空心鋼錠凝固過程的溫度場進行了有限元分析，對不同錠型結構的芯部換熱系數、耐火材料厚度對最終凝固位置、內筒壁最高溫度及縮孔疏鬆的影響進行了對比，並討論了耐火材料典型部位的溫度隨凝固時間的變化。 -
Abstract : using furan sand to produce heavy diesel engine block and crankshaft eliminated defects of castings including “ penetration / burn - in ”, “ shrinkage porosity ”, “ big dimension deviation ” of cylinder block, “ penetration / bum - in ”, “ misrun ” and “ run - out ” of crankshaft, and so on
文摘:樹脂砂鑄造工藝應用於大型球墨鑄鐵件整體鑄造柴油機缸體、曲軸生產上消除整鑄缸體「粘砂」 、 「縮松」 、 「尺寸偏差大」及曲軸「粘砂」 、 「澆不足」 、 「漏鐵液」等鑄造缺陷，具有明顯的效果。 -
Metal poured into a mold cavity during the casting process solidifies with the possibility of shrinkage, segregation or porosity, which can prevent an " as - poured " casting from being acceptable for severe applications
在鑄造過程中，澆鑄到模腔內的金屬在凝固過程中可能會產生收縮、分離或氣孔，這些問題使得「澆鑄」鑄件無法被苛刻環境應用領域所接受。 -
The main task of the thesis is that prediction & analysis system of shrinkage / porosity defect in a casting, which is oriented to foundry engineering application, was preliminary developed based on ansys. the three - tier developing hierarchy structure was adopted in this system by operation visualization, parametric design, and function modularization
本論文以有限元分析軟體ansys為二次開發平臺，採用三層開發體系層次結構，運用操作圖形化、設計參數化、功能模塊化技術，初步開發了面向鑄造工程應用的鑄件縮孔縮松缺陷預測及缺陷分析系統。 -
Tensile stress will accelerate the carbonation of paste and mortar, which can be explained by the reason that shrinkage of carbonation is confined by tensile stress, and the function x = c0eantb can describe this process. carbonation can lower the total porosity and lessen the aperture in the cement paste
外部彎曲應力會加速水泥石和水泥砂漿的碳化過程，這可能與受拉區域碳化收縮受到限制有關：彎曲應力作用下水泥石和水泥砂漿的碳化動力學過程可用式x = c _ 0e ~ （ an ） t ~ b描述。 -
Abstract : through analysis of typical technology for some lost wax casting examples, it is expounded that improvement of casting design with more reasonable technology offers an effective and simple way to obtain highly qualitative and compact castings without porosity and shrinkage defect
文摘:通過對幾個典型生產實例的工藝分析，說明用修改精鑄件結構設計的方法，使鑄件結構更具合理的工藝性，是獲取優質精鑄件的一條行之有效和便捷的途徑。 -
The results indicated that the time of heat preservation had important influence upon the macrostructure, apparent porosity rate, volume weight, the pervasion rate, shrinkage rate and the compressive strength
研究結果表明，保溫時間對孔結構、氣孔率與容重、水滲透率、收縮率以及強度有著重要的影響。
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