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  • 鋁鑄件的鑄造後處理方式有哪些
  • 本站編輯:杭州环亚AG国际厅機械有限公司發布日期:2020-02-08 19:11 瀏覽次數:
鋁鑄件的熱處理其實屬於鑄造後處理工藝中的一種,是在鋁鑄件鑄造完成以及清理後進行的,除此之外,還將涉及到整形、粗加工、防鏽處理等後處理環節,而且它們的實際運用都是根據要求來的。  
鑄造後處理是鋁鑄件生產的末道工序,對鋁鑄件的品質有相當重要的影響。但不同的後處理,對應的效果也是不同的,以熱處理來說,它是為了改善或改變鋁鑄件的原始組織而采用的,目的是消除鋁鑄件內應力,保證鑄件性能,防止鑄件變形和破壞。
鋁鑄件熱處理一般有淬火、退火、正火、鑄態調質、人工時效、消除應力、軟化和石墨化處理等,針對的是不同的工況。比如說鑄件要求很高的耐磨性和足夠的韌性,其內部組織應為奧氏體。為此,需對鑄件進行淬火處理,可以將鑄件加熱到奧氏體區域使其完全奧氏體化後,迅速淬水激冷,使奧氏體來不及轉變而保持下來。
鋁鑄件後處理分為矯正、修補和表麵精整三個方麵,因為有些鑄件在凝固、冷卻以及熱處理過程中會產生不同程度的變形,使部分尺寸超差,所以需用矯正的方法修複。矯正主要利用機械力量在室溫或溫態下進行,當變形量過大時,也可以在加熱爐內利用鑄件自重或外加壓重進行高溫矯正。
鋁鑄件的外部缺陷主要使用焊接手段修複;鑄件表麵粗糙和凹凸不平一般用懸掛砂輪和高速砂輪磨光精整。粗加工是針對鋁鑄件局部進行的一項後處理技術,鑄件經粗加工後能及時發現缺陷予以解決,並能減輕重量,還可使廢料和切屑能夠地分類回用。而防鏽處理是為了避免鋁鑄件在運輸或存放期間生鏽而采用的,用的是塗刷底漆的方式。
The heat treatment of aluminum castings actually belongs to one of the post-treatment processes of casting, which is carried out after the completion of casting and cleaning of aluminum castings. In addition, it will also involve the post-treatment links such as shaping, rough processing, rust prevention treatment, and their actual application is based on the requirements.
The post-treatment of casting is the last process of aluminum casting production, which has a significant impact on the quality of aluminum casting. However, different post-treatment has different effects. In terms of heat treatment, it is used to improve or change the original structure of aluminum casting. The purpose is to eliminate the internal stress of aluminum casting, ensure the casting performance, and prevent the casting from deformation and damage.
Heat treatment of aluminum castings generally includes quenching, annealing, normalizing, as cast tempering, artificial aging, stress relief, softening and graphitization, aiming at different working conditions. For example, casting requires high wear resistance and enough toughness, and its internal structure should be austenite. For this reason, it is necessary to quench the casting, which can be heated to the austenite area to fully austenitize, then quenched and quenched rapidly, so that the austenite can not be transformed and maintained.
The post-treatment of aluminum castings can be divided into three parts: correction, repair and surface finishing. Because some castings will have different degrees of deformation in the process of solidification, cooling and heat treatment, which will make some dimensions out of tolerance, so rectification is needed for repair. The correction is mainly carried out at room temperature or temperature by mechanical force. When the deformation is too large, the casting self weight or external pressure can also be used in the heating furnace for high temperature correction.
The external defects of aluminum castings are mainly repaired by welding, and the rough and uneven surface of castings are generally polished and finished by suspension wheel and high-speed wheel. Rough machining is a post-treatment technology for local aluminum castings. Defects can be found and solved in time after rough machining, and the weight can be reduced, and the scrap and chips can be classified and reused. The antirust treatment is used to avoid the rust of aluminum castings during transportation or storage, and the method of painting primer is used.