Shanghai Lanke Thread Tools Co., Ltd

1.Tooth collapse

Completely threaded tooth fracture

Problems that are particularly prone to occur with spiral taps

reason

The cutting is wrapped around the thread teeth of the tap, and the wrapped cutting is sandwiched between the tooth mountains of the tap and the material being cut. The tap performs

During cutting, it is common for tooth breakage to occur due to cutting interference

countermeasure

Reduce cutting speed

Use a high spiral groove tap

When machining with spiral taps using NC and M/C on the horizontal axis, the cutting is prone to entanglement with the chuck, causing problems such as chip blockage, tooth breakage, and breakage

It is recommended to try using low helix or straight groove taps that do not cause chips to expand due to rotational force to improve this issue.

2. Damage caused by folding

Reasons and Countermeasures

Whether the bottom aperture is appropriate (whether the bite rate exceeds 100%)

Is the bottom hole inclined

Is there any shaking of the material being cut (confirm the vise)

Is the tap touching the bottom when processing blind holes

3. Accuracy

Expand hole

reason

Excessive or insufficient thrust

If there is a loose gap between the tap and the inner teeth after cutting, it indicates that the feed during cutting is abnormal

countermeasure

It is necessary to adjust the appropriate feed rate

Recommend using a fully synchronized feed mechanism with a fixed clamp head

When the machinery (such as drilling machines) does not have the above functions, please adjust the feed speed of the spindle

Shrinkage cavity

Compared to drilling holes, it occurs less frequently

Non ferrous alloys or resins with long internal thread locking holes, or machining castings (FC) materials, etc., with severe tap wear on the machined material

This problem often occurs as well

Also, when the plate around the thread is thin and the center of the internal thread is skewed, it can also cause shrinkage. The general solution is to use a larger size tap that estimates this shrinkage.

However, if there are residual solvents or chips inside the internal thread, causing unevenness or damage to the tooth mouth and teeth, it can lead to the gauge passing through

When measuring NG, it is necessary to re-examine factors such as the cutting performance and chip removal of the tap.