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What is the difference between a three-blade drill and a two-blade drill?
First of all, what do you want to improve from the two-blade drill?
- We want to aim for further efficiency.
- We want to further reduce the cost of drilling holes.
It may not be enough to review conventional tools or improve the conditions of two-blade drills.
Therefore, we will consider whether a three-blade drill can be considered.
Compared to two-blade drills, three-blade drills have the following advantages.
(1) High efficiency
・ number of flutes Increase in feed amount per revolution
(2) Well-balanced guiding performance
・The number of points where the margin part comes into contact during processing has been increased from 2 to 3.
・Stabilization of machining balance by three-point support
In particular, the high guiding performance of the three-blade blade enables hole processing with better cylindricality and roundness.
Depending on the required accuracy, it may be possible to omit the finishing process after drilling holes with a two-blade drill.
・Possibility of increasing the tool life of tools such as Tap and reamers by stabilizing the replacement of the post-process
On the other hand, compared to two-blade drills, the disadvantages that can be expected with three-blade drills are as follows.
(1) Increased thrust resistance
・Machines and workpieces that do not have rigidity are concerned about adverse effects due to high loads.
(2) Tool prices are expensive
・ Due to the large number of number of flutes and grooves
(3) Compatible materials are limited.
・ number of flutes increase chip Pockets are narrower, and materials with long chips are difficult to eject.
Therefore, three-blade drills are often considered for machining content with few disadvantages and many advantages.
As an example...
Cast iron such as FC and FCD is a representative material, which is less prone to cutting force and less prone to chip growth.
Rigid machine and large workpiece.
The number of workpieces to be processed is large.
When these conditions are met, a three-blade drill has been considered effective.
Therefore, it tends to have the image that it is difficult to use.
Recently, due to the evolution of tool performance, drills that can reduce the disadvantages of three-blade drills have appeared.
In the case of OSG's products, this is ADO-TRS.
If you are looking to improve your hole machining, please consider ADO-TRS.