【正文】 g shorter and wider until its expansion is restricted by full contact with the container walls. Then, as the pressure increases, the soft (but still solid) metal has no place else to go and begins to squeeze out through the shaped orifice of the die to emerge on the other side as a fully formed profile.About 10 percent of the billet, including its outer skin, is left behind in the container. The pleted extrusion is cut off at the die and the remainder of the metal is removed to be recycled. After it leaves the die, the stillhot extrusion may be quenched, mechanically treated, and aged.Lubricated saws are equipped with delivery systems that feed the lubricant through the teeth of the saw for optimal efficiency and cut surface.Automatic devices clamp profiles in place for sawing. Saw chips are collected for later recycling. 注釋：Billet 坯料Heating furnace 加熱爐Extrusion press with die 帶模具擠壓機Saw 鋸割Stretcher [?stret??] 拉伸機Aging oven 時效箱Fahrenheit [′f230。r?n?ha?t] 華氏溫度Quenched [kwent?d] 淬火的Aged 時效Clamp 夾具Profile 型材Circumscribing circle diameter 外接圓直徑 AgingSome extrusion alloys reach their optimal strength through the process of aging, sometimes known as age hardening. Natural aging occurs at room temperature. Artificial aging takes place through controlled heating in an aging oven and is sometimes referred to as precipitation heattreating.When the profile emerges from the press it is in a semisolid state, but rapidly solidifies as it cools or is quenched (whether by air or water). Nonheattreatable aluminum alloys (such as those utilizing manganese or magnesium) derive their strength through natural aging and cold working. Heattreatable alloys (such as those utilizing copper, zinc, and magnesium with silicon) are further strengthened or hardened through controlled thermal treatments that affect the metallurgical structure of the alloys.Either way, the aging process ensures the uniform precipitation of fine particles through the metal, yielding maximum strength, hardness, and elasticity for the specific extrusion alloy.注釋：Age hardening 時效強化Natural aging 自然時效Artificial aging 人工時效Precipitation [pri?sipi?tei??n] heattreating 沉淀熱處理Nonheattreatable aluminum alloys 不可熱處理鋁合金Metallurgical 冶金的 PackagingAfter sufficient aging, whether in an aging oven or at room temperature, the profiles are moved to other areas of the plant for finishing or fabricating, or to be packed and prepared for shipment to the customer.Most extrusion plants are equipped to acmodate any likely packaging requirement. Profiles are palletized in such a way as to be protected from surface damage, twisting, or other hazards. Customers may specify their own packaging requirements, or the type of extruded product may suggest a particular method of packaging for ease of storage or delivery.注釋：Packing 包裝Fabricating 加工Palletized [′p230。li?taizd] 托盤化的