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Tap is a kind of machiningInternal threadThe tool, according to the shape can be divided into straight edge and screw tap tap, in accordance with the use of the environment can be divided into hand taps and machine taps, made in accordance with the specifications, and can be divided into metric, British tap, according to the origin can be divided into domestic and imported tap tap. Tap is the most important tool for manufacturing operators to process thread at present.
One kind of machining insideThreadThetoolThe grooves are opened along the axial direction. Also calledScrewAttack. Taps are classified according to their shapesStraight slot tap,Spiral groove tapandTap tap(tap). Straight slot tap is easy to process,accuracySlightly lower, larger yield. Generally used for general purposesLathe，drilling machineandtappingMachine thread processing, cutting speed is slow.Spiral groove tapIt is widely used in drilling blind hole of CNC machining center. The processing speed is fast, the precision is high, the chip removal is better and the neutral is good.Tap tapThe front part has a slot for cutting through holes. Most of the taps supplied by the tool factory are nowcoatingThe service life and cutting performance of taps are greatly improved compared with uncoated taps. The cutting load distribution of taps with unequal diameter design is reasonable, the machining quality is high, but the manufacturing cost is also high. Trapezoidal thread taps are usually designed with unequal diameters.
Machine sumHand tapIt is a standard tap for cutting ordinary thread. Traditionally, the manufacturing accuracy is highhigh speed steelMolar taps are calledMachine tapCarbon tool steel orAlloy tool steelThe teeth (or incisor) taps are called hand taps, in fact, the structure and working principle of the same are basically the same. Usually, the tap is made up of the working part and the shank. The work part is divided againCutting partIn the calibration section, the former is equipped with a cutting cone, which is responsible for cutting and the latter is used to calibrate the size and shape of the thread.
For machining nuts or other parts of the ordinary internal thread (ie tapping). Machine taps usually refers to high-speed steel molar taps, suitable for use inMachine toolHand tapping; finger tappingCarbon tool steelOr alloy tool steel rolling (or incisor) tap, suitable for manual tapping cone is tool processing all kinds of medium and small size internal thread, it has the advantages of simple structure, convenient use, can be manually operated, can also work on the machine tool, is widely applied in production.
The thread of the small size of the fibers, is almost the only tool. The types of fibers: hand taps, machine taps,Nut tapExtrusion tap, etc..
To process tapping is difficult, because the tap is almost buried in cutting the workpiece, the processing load of each tooth is larger than the other tool, and contact with the workpiece surface along the screw tap is very large, cutting thread when it must accommodate and remove the chip, therefore, can be said that the tap is working in very harsh conditions. In order to make the tapping smoothly, all possible problems should be considered in advance. Such as the material properties of the workpiece, the choice of what tools andMachine toolHow high is the selection?cutting speed、Feed rateEtc..
Taps are usually divided into single or group. Small and medium sized through hole can be attacked by single tap at one time. When machining blind hole or large size screw hole, the group tap is usually used, that is, the processing of one screw hole is completed by more than 2 taps. Group taps have two designs: equal diameter and unequal diameter. Equal diameter design taps, each branch only cutting conelengthDifferent sizes of taps designed with different diameters have different thread sizes, and only the last one has a complete tooth shape. The cutting load distribution of taps with unequal diameter design is reasonable, the machining quality is high, but the manufacturing cost is also high. Trapezoidal thread taps are usually designed with unequal diameters.
(1)When tapping, insert the nose to tap the center line and the center line of drilling.
(2)The two hands rotate evenly and a little pressure is added to the tap to feed, and no additional pressure is needed after the feed. (3) each turn tap is rotated about 45 degrees at once to cut the chip so as not to block.
(4)If the tap rotating difficult, can not increase the rotation force, otherwise the tap will break.
Japan OSG titanium left teeth tooth spiral screw 6-8-32U10-24-32 6G stainless steel machine tap