前言为竞争激烈的交通运输业和结构工业生产的铝合金挤压件,必须符合日益增长的严格的工程性能的要求。为了在这些市场上有效地进行竞争,独立挤压厂必须了解在制造过程中挤压件的工程性能可能产生的变化。这些挤压厂充分地认识到,生产的铝合金挤压件必须成本很低,并且可便宜地进行加工,同时,产品必 Preface The highly competitive extrusion and extrusion of aluminum alloys for the transport and construction industry must meet the demands of ever-increasing stringent engineering performance. In order to compete effectively in these markets, independent extrusion plants must understand the possible changes in the engineering properties of the extrusion during the manufacturing process. These extrusion plants are fully aware that the aluminum extrusion produced must be low cost and can be processed cheaply and at the same time the product must