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★ in metal processing in general, is usually rapid removal of metal and the formation of a smooth surface, even if the end of the tapping process, but is not exactly. First of all, thread tapping after must conform to the standard and with matching fastener screw; [precision automatic tapping machine] secondly, general process of cutting end exit tool is very simple, but after the completion of tap tapping out the time spent as much as possible, to spend time with the cutting thread. All of these, the tapping a is indispensable, it is slow and boring process.
In addition to these common problems, some other factors also increase tapping difficulties: the main factors can be divided into the same material and the same operation about two categories. But in any case, the correct choice of the tap will produce different effects of tapping effect: the attack is very porous, tapping a hole or a full attack does not move. Following a brief description of some field process and tool manufacturing technical staff to overcome difficulties in tapping, has already been done.
Diamond stone mold company chief Dan Welter provides another example of the tapping difficult-to-machine materials. Automatic hydraulic drilling machine [air] the material is a kind of super austenitic stainless steel Al
6XN, antioxidant corrosion performance, widely used for conveying liquid parts, such as the original parts etc.. Chromium, nickel, molybdenum content of the material is very high (respectively 20%, 24% and 6%), and high hardness (HRB88) and cold hardening tendency.
This is a printer ink pump, Welter in part to the upside six 4 ~ 40 threaded through holes on each side, playing three holes, the hole depth is 6.35mm. Requirements on the workpiece a drilled hole, and then tapping. Start, he uses the standard TiN high-speed steel coated taps, but the hardness is too high, resulting in tap crack. After Welter test six different high-speed steel cone, finally gave up the standard tap problem solving plan, and began to seek new solutions. The development of extrusion taps can solve this problem, although so far that extrusion Taps is only suitable for soft materials. He used the tap a production company OSG. According to the staff of OSG Ltd, the tap with a Electra LUBE coating, the thickness of 2.54 μ m, is a solid lubricant for soft, smooth surface sedimentary formation in tap, tap to reduce torque at work, and preventing adhesion, jam, scratch occur
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