discount 70% in 2018-09-23 to 2018-09-25
price: USD$ 166.60
freight :USD$7.00,(Postal parcel)
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Authentic American XinDa (SOMTA) imperial straight pipe thread tap BSP
Application: tooth tube processing
Surface treatment: white fine grinding
Each group: 2
Machine and hand taps
Is the standard tap ordinary thread cutting. China on the habits of the high speed steel geared tap high manufacturing accuracy is called machine taps, the rolling carbon tool steel or alloy tool steel (or incisor) called tap tap, structure and working principle of the two are basically the same in fact. Usually, the tap by working part and the handle part of the form. The work consists of a cutting portion and a calibration part, the former is responsible for cutting cone grinding, cutting work, the latter is used to calibration of thread size and shape.
(1) when tapping, insert the nose to tap the center line and the center line of drilling.
(2) with uniform rotation and slightly pressure to tap the feed, feed without added pressure.
(3) each turn tap a reversal of about 45 DEG to cut chip, so as to avoid blocking.
(4) if the increased rotational force can not rotate or tap tap difficulties, will break.
(1) the workpiece orifice to the threaded hole chamfering, screw through holes at both ends chamfering.
(2) the workpiece clamping position to correct, try to make the central threaded hole lines placed in the horizontal or vertical position, which is easy to judge whether the tap tapping plane perpendicular to the axis of the workpiece.
(3) in tapping at the beginning, we should try to put it on the tap, then tap the pressure and rotate the holder, when starting 1-2 circle, carefully check and correction of tap position. General cut 3-4 threads, the tap position should be correct. Later, only by rotating the holder, and add pressure to the tap should not, otherwise the thread form will be damaged.
(4) when tapping, each turn holder 1/2-1 circle, it should be back about 1/2 ring, the chip broken off easily discharged, and can reduce the cutting edge for crumbs to tap jam phenomenon.
(5) of different screw holes, often exit tap, exclude chip in the hole.
(6) tapping plastic material, to add lubricating cooling liquid. For general use of steel material, emulsion oil or high concentration of high available vegetable oil or MoS2 etc.. For the stainless steel, available 30 oil or oil vulcanization.
(7) for use after a tap tapping process, must first with the hand screw has been tapping, to no precession, and then use the tapping head turn. At the end of the cone end exit, but also to avoid the fast rotating holder, the best hand spin out, to ensure good quality of the thread is not affected.
(8) during the tapping, tap and screw to maintain concentricity.
(9) during the tapping, the calibration part tap cannot all succeed, or will cause chaos in the anti tooth car from the tap.
1. spiral fluted tap
Spiral fluted tap processing more suitable blind hole threads (also called blind), processing chip to discharge. Because the spiral angle, tap the actual rake angle increases with increase of helix angle. Experience tells us: the processing of black metal, spiral angle selected smaller, generally at about 30 degrees, ensure the spiral tooth strength, to prolong the life of tap. Processing non-ferrous metals such as copper and aluminum magnesium zinc spiral angle is selected larger, at around 45 degrees, to some sharp cutting, chip.
2. tip tap
Processing thread tip tap chip down directly into its core dimensions is relatively large, good strength, can bear larger cutting force. The processing of stainless steel, non-ferrous metal, ferrous metal effect is good, should give priority to the use of a screw through hole tip tap.
3. extrusion Taps
Suitable for processing non-ferrous metal extrusion Taps, and the working principle of different cutting tap, it is made of metal extrusion, plastic deformation, the formation of internal thread. Internal thread of metal fiber extrusion is continuous, tensile, shear strength high, the processing of the surface roughness is also good, but require a higher extrusion tap hole: too large, base metal less, causing the thread is too large, the strength is not enough. A small, closed extrusion of metal with nowhere to go, cause the tap break.
1, when tapping end orifice chamfering; tap hole coaxial with the workpiece; tapping should begin to apply an axial force to tap into the breakthrough after a few laps will no longer need to exert axial force.
2, when the tap calibration part into the screw hole, each positive half turns to a circle to return 1/4, 1/2 ring, the chip broken down again after school; take the through hole, often exit tap chip.
In 3, the steel workpiece tapping on to cutting fluid tapping in cast iron workpiece, can add a little kerosene; with a taper, and then two attack and three attack, must be screwed in the screw tap.
4, when threading workpiece end to chamfer, pull the tooth end surface shall be perpendicular to the axis of the work piece; threading began to be applied to a large number of axial pressure, rotate the corresponding pressure; when the pulling teeth cut threads on the workpiece, don't add pressure.
5, when threading for chip breaking, timely discharge, should reverse pull teeth often.
6, the work should be firmly fixed in the clamp, a clamping device; when the tap is broken, a hand to touch off don't clamp, chisel or punching out, broken wires must wear protective glasses.
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