What kinds of drill sleeves are used? What are they used for?
2 types of fixed drilling sleeves; drilling and drilling sleeves;
Drill sleeve is divided into fixed drilling sleeve and fast change drill sleeve two kinds. A fixed drill sleeve is used for drilling only. Quick drill bushing, is generally the first to remove the drill sleeve on the drilling, reaming and reaming.
Drill sleeve can be divided into four kinds, namely: fixed drilling sleeve, interchangeable drill sleeve, fast change drill sleeve, special drill sleeve.Fixed drill sleeve: drill sleeve is directly pressed on the drilling template. The fixing drill sleeve is simple in structure and high in drilling accuracy, but it can not be replaced after wearing. Fixed drill sleeves are suitable for small batch production in a single drilling process.Replaceable drill sleeve: drill is sheathed in the Bush, bushing is pressed on the drilling template, and the drill sleeve is pressed by screw to prevent the drill bush from rotating or withdrawing. When the drill sleeve is worn, loosen the screws and replace them quickly. A single drilling procedure suitable for mass production.Quick change drill sleeve: its structure is similar to interchangeable drill sleeve. When the workpiece in one process has the same hole to be processed by various methods (such as drilling, reaming, reaming, tapping, etc.), the drill sleeve with different apertures can be quickly replaced. When replacing, the drill sleeve gap is turned to the screw and can be taken out.Special drill sleeve: when the structure of the workpiece is not suitable for the use of standard drill sleeve, it can design a special drill sleeve adapted to the workpiece. The height of the drill sleeve is increased by H, the guiding performance is good, the tool rigidity is improved, and the machining accuracy is high, but the abrasion of the drill sleeve and the cutter is intensified, and the H= (1 to 2.5) d is generally taken. The chip space H increases and the chip removal is convenient, but the tool rigidity and the machining accuracy of the hole will be reduced. Cast iron for drilling easier to remove chips, h= (0.3 ~ 0.7) d; drilling difficult to chip out of the steel parts, h= (0.7 ~ 1.5) d.
