Loading ...
Loading ...
Loading ...
PORTABLE EDM MACHINE PORTABLE EDM MACHINE
15 16
phenomenon, it seems to be the operator's skill problem., but actually is due to
insufficient tap structure. Currently used manual tap front are tapered, its
original face contact with the bottom hole is dot, silk cone and the bottom hole
concentricity all the skills and experience of the operator to maintain, should not
only keep the tap around perpendicular to the bottom hole end face, and remain
perpendicular to the bottom hole before and after the end, in a forced down the
tap equal strength from both hands at the same time screw tap.So many things
must be done at the same time, and it is difficult for a less skilled operator to do
so.Even if the technical level of the senior technicians, in the manual tapping
operation is not every time can grasp very accurately.
2.Prevention of tap breaking
(1)improve the structure of the tap. A cylinder with a length of 5 ~ 10mm and a
diameter the same as that of the drill bit for the bottom hole is added at the front
end of the head cone, which is used as the guiding part for the tap and the bottom
hole to automatically maintain concentric, so that the tap itself can automatically
maintain concentric with the bottom hole at the beginning of tapping.When
tapping with this kind of tap, it can avoid the phenomenon that the tap is broken
due to the different center of the tap and the bottom hole, and also can avoid the
phenomenon that the tap is broken due to the mismatch between the bottom
hole and the tap.At the same time, because it is impossible for the tap to enter
the bottom hole which does not match the tap, it can effectively prevent the
operator from misusing the drill bit.
(2)The essay strengthens workers' skill training and technical training, improves
the theoretical level of manual tapping operation, and masters the practical skills
in tapping operation.
Causes of common tap breakage and preventive measures
1. Cause analysis of tap breaking
(1)After processing blind hole thread, when the tap is about to contact the
bottom of the moment, and the operator is not aware, still not to the bottom of
the tapping speed, then the tap must be broken.
(2)The processing blind hole thread, if there is part of the chip failed to
timely discharge and plug in the bottom of the hole, if the operator forced to
continue tapping, tap is bound to break.
(3)The poor quality of the tap itself is one of the reasons that lead to the tap
breaking in the tapping process.
(4)Of in the tapping process, because the operator's hands force is not
balanced, resulting in the direction of force change and broken tap.This
situation occurs in the smaller diameter thread processing.
(5)It is not matched with the tap. Processing, for example, the M5 thread x
0.5 should use shall be 4.5 mm drill base hole, if misused for M5 Ø 4.2 mm drill
head processing, due to the smaller aperture, do not match with tap, torque is
bound to increase.At this time, if the operator still does not find the wrong bit
and continues to forcibly tap, then the tap breaking phenomenon is inevitable.
(6)at the beginning of tapping, the tap start positioning is not correct, that is,
the axis of the tap and the bottom hole of the Central Line of the core, in the
tapping process torque is too large, which is the main reason for the tap break,
which caused by the phenomenon of tap break more than the previous all
factors caused by the total tap break.The presence of this tap and the bottom
hole of the heart of the phenomenon, it seems to be the operator's skill
problem.The presence of this tap hole of the heart of the