tailieunhanh - Machining Processes Part 4

Tham khảo tài liệu 'machining processes part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Broaching 199 Special Broaching Machines Special broaching machines also fall under lhe general categories of internal or external use. but beyond that It is difficult to classify the wide and often unique variety of special machines. It is sometimes impossible to bring the workpiece to the machine. This is particularly true in the marine power generation construction and airframe industries. Therefore broaching machine builders have designed portable machines that can be brought to the work. A form of internal broaching called strip broaching is occasionally used to effect large gains in productivity per machine and manhour through reduced broaching lime cycles. In strip broaching the broach is returned directly through the hole just broached immediately after the cutting stroke eliminating the necessity for disengaging the broach tool from its pulling fixture Fig. 11 . Because the cutting edges rub against the work on the return stroke broach lite is reduced but not to the extent where the overall savings derived from this technique are lost. Internal broaching of helicopter rotor spar sections is an unusual special broaching application. In one case a m 24 ft long workpiece had about mm s in. of 4153 aluminum removed around the periphery of the irregularly shaped internal form by 35 progressively stepped broach sections. These were pulled through the workpiece one at a time by a special electromechanical horizontal machine with a m 64 ft long bed. Broach sections were semi-automatically loaded and unloaded from the pulling bar at the beginning and end of each stroke. One operator handled the entire job. riding from loading to unloading stations in an electric cart. Pot broaching machines are arranged for machining outside surfaces such as gear teeth in one pass by means of cutler leeth inside a hollow broach. Most pot broaching machines push the work upward as indicated in Fig. 12 because such movement allows the chips to escape most easily and the

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