injection molding
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RHCM蒸汽無痕高光射出技術介紹
“蒸汽無痕高光射出” 又被稱為 RHCM (Rapid Heat Cycle Moulding) 成型技術的一種，技術是透過運用蒸汽將模具表面快速升溫，令成型模腔表面溫度達到樹脂塑膠的玻璃轉移溫度(Tg – Glass Transition Temperature)以上，然後開始進行射出成型，當完成模腔填充過程後，立即利用水(經處理)作為冷卻媒體使模具表面溫度急速下降，從而改變塑膠產品表面特性。 RHCM “蒸汽無痕高光射出”技術發展至今已近4年之多，由2004年德國K-Show中正式開始公佈，直到2007年中國電視生產商才開始使用在生產液晶平板電視外殼上。 其實早在2005年韓國Samsung (三星) 公司已開始使用RHCM “蒸汽無痕高光射出”技術生產LCD液晶平板電視外殼，其中主要優點是可以使樹脂塑膠產品外殼擁有高光澤度；消除了傳統注塑成型工藝存在的熔接痕問題，並省卻了產品二次加工的必要和有關的成本。 RHCM射出成型技術與傳統射出成型工藝相比之下，能大大改善產品表面光澤度，解決產品表面熔接痕問題，並對提升產品表面硬度也有一定幫助. 另外，RHCM射出成型技術也可以應用到添加纖維的工程塑膠中，能夠有效解決產品表面浮纖的問題。
Analysis of a Single-Span Euler-Bernoulli Beam under Different Loading Conditions
First, select one of the four different support conditions for the beam in the diagram at the top-left corner. The beam length is selected using the length slider located below this diagram. Select the loadings with the controls on the left side.Shape is a determining factor in the part's cost and ease with which it can be extruded. In extrusion a wide variety of shapes can be extruded, but there are limiting factors to be considered. These include size, shape, alloy, extrusion ratio, tongue ratio, tolerance, finish, factor, and scrap ratio.
Aluminum Extrusion Process-Billet, Alloys, Extruded Products
Rolling | Mechanical Engineering
Methods are: Pressing Centrifugal Casting Slip Casting Extruding Gravity Casting Rolling Iso-static Moulding Explosive Compacting Fibre Metal processes Pressing: The function principles of the mechanic press machines differ in how to ensure the upper punch main movement by cams, spindles and friction drives, eccentric, knuckle-joints or by the round table principle, independent if the die or lower punch movement is realized by cams or eccentric systems or other mechanically or hydraulically combined systems. The executions of auxiliary movements are also not decisive for a term-classification. These auxiliary movements can also base on pneumatic and hydraulic principles.
Hot Tear Formation and Coalescence Observations in Organic Alloys
Casting Process Simulation and Visualization: Overview P.-D.
Extrusion is a manufacturing process where a material is pressed through a die. It is used to produce long formed objects of constant cross sections from different materials such as aluminum, copper, stainless steel and various types of plastic. Mostly rods, cables and pipes are made from copper and steel, whereas complex profiles are produced using aluminum. This work focuses on a direct extrusion process as shown in Fig. 1 with aluminum alloys of the series 6000 (Al-Mg-Si) and 7000 (Al-Zn-Mg).
