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Automatic screw machine and method of making countersunk or counterbored articles in an automatic screw machine
Automatic screw machine and method of making countersunk or counterbored articles in an automatic screw machine
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机译:自动螺丝机和在自动螺丝机中制造沉孔或沉头孔的物品的方法
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808,035. Combined lathes and drilling-machines; chucks. PAPER MATE MANUFACTURING CO. Dec. 18, 1956, No. 38549/56. Class 83 (3). Articles 12 having their opposite ends countersunk or counterbored are machined from bar stock 3 in an automatic lathe by cotmter-boring the end of the stock 3, parting-off the machined end, maintaining the separated work 12 in axial alignment with the stock 3 but spaced therefrom, and then simultaneously counterboring the newly-formed end of the stock and the unbored end of the separated work. The lathe comprises a headstock 1 in which the stock 3 is carried in a hollow spindle, an auxiliary spindle 8 to receive the parted-off work 12 and a tool-frame (not shown), supporting a drillholder 5 with oppositely-directed drills, or a pair of drill-holders 5, 6, the frame also supporting holders for parting-off and turning-tools (not shown). Radial movements of the tool-holders and axial movements of the headstock and auxiliary spindle are effected by a cam-shaft. The outer surface of the stock is turned to the desired form before the tool-holder or holders 5, 6, with oppositelydirected drills 15SP1/SP, 16SP1/SP, 17SP1/SP, 18SP1/SP, are brought to the operative position shown in Fig. 4. The headstock and spindle 8 are fed towards the drills during the drilling of bore 15 and again, after the holders 5, 6 have been re-positioned, during the drilling of bore 16 with drill 16SP1/SP. After radial-withdrawal of this drill, the headstock is again advanced, to carry the stock 3 to the path of the parting-off tool (not shown), where it is received by the collet of spindle 8, and the workpiece 12 is withdrawn by the spindle 8 after the parting-off operation. The stock is then advanced through the headstock, which is again fed forward for a fresh cycle of operations on the new end of the stock. In this cycle, the unbored end of the work held by the spindle 8 is drilled, simultaneously with the drilling of the holes 15, 16 in the stock, by feeding the spindle 8 towards the drills 17SP1/SP, 181 when the headstock is fed towards the drills 151, 161. The collet of spindle 8 is opened and the spindle, withdrawn, leaving the finished work 12 on the drill 17SP1/SP, Fig. 6, which withdraws the work radially. When the spindle 8 is again advanced to receive the next workpiece, spring fingers 11 on the housing of the spindle engage the finished work on the drill 17SP1/SP and remove it as the spindle is retracted, a stop (not shown), releasing the work from the fingers and permitting it to fall into a shoot. Knurling- operations may also be performed, and the auxiliary spindle is preferably rotated at a higher speed than the headstock spindle. Collet-chucks.-The collet is operated by a diaphragm, piston 54, Fig. 8, secured at its outer periphery to the hub 37 of a driving pulley for the spindle and at its inner periphery to the shank 45 of the collet, the diaphragm being clamped by a nut 53 against a backing 48 which engages screw-threads on the shank and is guided by pins 49. The collet is opened, while rotating, by a spring 58, and closed by pressurefluid admitted through a connection 43 on the spindle-housing and fed to the diaphragm-along one or more surface-channels or passages 46 in the shank 45.
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