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大批量生产小钻头时,外圆的粗磨、半精磨、精磨等都采用高效率的无心磨床,班产量达二万多件,因此托板的支承面极易磨损成弧形凹坑,影响加工质量。为解决磨损问题,在托板支承面上镶焊硬质合金一片(图1)。由于支承面的宽度很小,在铜焊硬质合金片时,高温使托板体弯曲,并使硬质合金片产生热应力,引起罅裂和降低耐用度。为此,多年来我们采用各种低温粘结剂进行了试胶与应用,认为SL型环氧胶粘剂比较满意,该胶由上
Large-scale production of small bits, the rough cylindrical grinding, semi-fine grinding, grinding and so use high-efficiency centerless grinder, the class production of more than 20,000 pieces, so the pallet support surface easily wear arc pits , Affect the processing quality. In order to solve the problem of wear, a piece of cemented carbide is set on the supporting surface of the pallet (Fig. 1). Due to the small width of the bearing surface, high temperatures cause the carrier body to buckle as it brazes the cemented carbide piece and cause thermal stress to the carbide piece causing chapping and reduced durability. To this end, over the years we use a variety of low temperature adhesives for testing and application, that the type of epoxy adhesive more satisfactory, the glue by the