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Tapping on special workpiece materials
Oct 14, 2017

Tapping on special workpiece materials

Machinability of workpiece material is the key to tapping difficulty. Current taps manufacturers are mainly concerned about the development

1. taps

Taps for machining special materials. In view of the performance of these materials, the geometry of the cutting part of the tap, especially the front angle and the concave volume (HOOK) - the front concave degree, is changed. The highest processing speed is sometimes limited by machine performance. For the smaller tap, the spindle speed to achieve the ideal speed [rpm= (SFM x 3.8) / tap diameter], may have exceeded the maximum spindle speed. On the other hand, the high speed cutting with larger tap will produce greater torque, which may be greater than the power provided by the machine tool. With the 700psi internal cooling tool, the cutting speed may reach 250sfm. In the machine tool without internal cooling, the cutting speed can only reach 150sfm. Tap is different from most metal cutting tools, because it is very large contact area with the workpiece hole wall, so cooling is very important. If the high speed steel cone is overheated, the tap will break and burn. The geometric characteristics of NORIS high performance taps are larger back angle and reverse cone."

The geometry of the tap and the special coating surface (such as TiN, TiCN, CrN or TiAlN) can greatly improve the life of the tap. These heat resistant, smooth coatings reduce the cutting force and allow tapping at higher cutting speeds. In fact, the development of the new high performance taps greatly promotes the spindle speed and power of the machine tool.

2. carbide taps increase

As hard alloy cutters gradually replace high speed steel tools in turning, carbide taps also begin to be more

Compared with the high speed steel, the hard alloy has high hardness and brittleness, and it is hard to tap with carbide tap. There is the problem of chip treatment. Even so, cemented carbide taps are very effective in processing cast iron and aluminum alloy materials, and the main form of breakage is mechanical wear.

Because the automobile industry processes a large number of cast iron and aluminum alloy parts, the hard alloy tap is used to obtain the long life of the tool. Tungsten carbide taps have longer life span than high speed steel cones in machining these materials. In the automotive industry, the reduction of the tool time is an important factor, while the long life of the hard alloy wire will minimize the tool changing time. The small screw angle cemented carbide tap with surface coating is applied to the aluminum alloy workpiece with silicon content of 8%-12%, and the effect is very good. With fine particles (Submicron-grain) tap hard alloy production, can increase the toughness of the tool without reducing the hardness, the effect on cutting of hardened steel, plastic and hard machining of nickel based alloy is very good. DL15 Ni series of special taps for nickel alloy produced by NORIS company, under certain conditions, can continuously tap more than 200 screw holes on nickel chromium iron alloy Inconel 718, and must be regrinding before reaching

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