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The Characteristics Of Tap And Its Use
Jul 17, 2017

Taps for a processing of internal thread of the tool, according to the shape can be divided into spiral tap and straight tap, according to the use of the environment can be divided into hand tap and machine tap, according to specifications can be divided into metric, American, and British tap, Origin can be divided into imported tap and domestic tap. Taps are the main tool for manufacturing operators to thread threads.

A tool for machining internal threads with grooves in the axial direction. Also called screw attack The tap is divided into straight taps, spiral taps and screw taps (apex taps) according to their shape. Straight groove tap processing is easy, the accuracy is slightly lower, the output is bigger. Generally used for ordinary lathes, drilling and tapping machine thread processing, cutting speed is slow. Spiral groove taps for CNC machining center drilling blind hole, processing speed, high precision, better chip, good for neutrality. The tip of the screw tip has a grooved groove for the machining of the through hole. The taps provided by the tool factory are mostly coated taps, which greatly improves the service life and cutting performance of the uncoated taps. The design of the tapered cutting load is not reasonable, the processing quality is high, but the manufacturing cost is also high. Trapezoidal thread tap is often designed with no equal diameter.

For the processing of nuts or other parts of the ordinary internal thread (ie tapping). Machine tap is usually referred to as high-speed steel grinding cone, suitable for tapping on the machine; hand tap refers to the carbon tool steel or alloy tools Steel screw (or incisors) tap, suitable for manual tapping.

Taps are machined in a variety of medium and small size of the internal thread of the tool, it is simple, easy to use, both manual operation, can also work on the machine, in the production of a very wide range of applications.

For small size internal thread, silk Wei is almost the only processing tool. Silky varieties are: hand with silk Wei, machine tap, nut tap, squeeze taps and so on.

Tapping is a difficult process, because the tap is almost buried in the workpiece for cutting, the processing load per tooth than other tools are large, and the tap along the thread and the workpiece contact surface is very large, cutting thread It must contain and remove the chips, so it can be said that the tap is working under very bad conditions. In order to make tapping smoothly, you should consider all the possible problems in advance. Such as the performance of the workpiece material, choose what the tool and machine tools, the choice of how high cutting speed, feed and so on.

The workability of the tapping workpiece material on the special workpiece material is critical to tapping. The main taps manufacturers are concerned about the development of special materials for the processing of the tap. In view of the performance of these materials, the geometry of the tapered cutting portion is changed, in particular its front angle and the amount of depression (HOOK) - the degree of the preceding recess. The maximum processing speed is sometimes limited by machine performance. For smaller tapes, the spindle speed may have reached the desired speed [rpm = (sfm x 3.8) / tap diameter), which may have exceeded the maximum spindle speed. On the other hand, with a large tap high-speed cutting, will produce a larger torque, may be greater than the horsepower provided by the machine. With a 700 psi internal cooling tool, the cutting speed is likely to reach 250 sfm. And in the absence of internal cooling facilities on the machine, the cutting speed can only reach 150sfm. Taps are different from most metal cutting tools because it is very large in contact with the workpiece wall, so cooling is critical. If the high-speed wire taps overheating, the tap will break, burn, NORIS high-performance tap geometry characteristics, that is, a larger rear angle and inverted cone. "

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