1.G73 (chip breaking cycle) is usually used to process holes whose depth exceeds 3 times the diameter of the drill bit, but does not exceed the effective edge length of the drill bit. 2.G81 (shallow hole cycle) is usually used to drill center holes, chamfering and does not exceed the drill bit’s effective edge length. 3 times diameter hole processing With the emergence of internal coolant tools, in order to improve processing efficiency, this cycle will also be selected to drill 3. G83 (deep hole cycle) is usually used for processing deep holes.
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The machine is equipped with spindle center cooling (water outlet)
The tool also supports central cooling (water outlet)
Choosing to use G81 to process holes is the best choice
The high-pressure coolant will not only take away the heat generated during drilling, but also lubricate the cutting edge in a more timely manner. The high pressure will also directly break the drill chips, so that the small chips generated will be discharged out of the hole in time with the high-pressure water flow. It avoids tool wear caused by secondary cutting and reduces the quality of the machined hole. Since there are no cooling, lubrication, and chip removal problems, it is the safest and most efficient solution among the three drilling cycles.
The material is difficult to break but other working conditions are good
When there is no spindle center cooling (water outlet)
Using G73 is a good choice
This cycle will achieve chip breaking through a short pause time or a small distance of tool retraction, but it requires the drill bit to have good chip removal capabilities. A smoother chip removal groove will allow the chips to be discharged faster, avoiding problems with the next drilling. The chips are tangled together, thereby destroying the quality of the hole. Using compressed air as an auxiliary chip removal is also a good choice.
If the working conditions are unstable
Using G83 is the safest choice
Deep hole machining will wear out too quickly because the cutting edge of the drill cannot be cooled and lubricated in time. The chips in the hole will also be difficult to discharge in time due to the depth. If the chips in the chip groove block the coolant, not only will it be greatly Reducing the life of the tool, the chips will also make the inner wall of the machined hole rougher due to secondary cutting, thus further creating a vicious cycle.
If you raise the tool to the reference height -R every time you drill a small distance -Q, it may be more suitable when processing near the bottom of the hole, but it will take a lot of time to process the first half of the hole, which causes Unnecessary waste.
Is there a more optimized way?
Here are two methods of G83 deep hole circulation:
1: G83 X_ Y_ Z_ R_ Q_ F_
2：G83 X_ Y_ Z_ I_ J_ K_ R_ F_
In the first method, the Q value is a constant value, which means that from the top to the bottom of the hole, the same depth is used for processing every time. Due to the need for processing safety, the smallest value is usually selected. , which also means minimal metal removal rate and virtually wastes a lot of processing time.
In the second method, the depth of each cutting is represented by I, J, and K respectively:
When the top of the hole is in good condition, we can set a larger I value to improve processing efficiency;
When the working conditions in the middle of the hole are normal, we use a gradually reduced J value to ensure safety and efficiency; when the working conditions at the bottom of the hole are bad, we set the K value to ensure the safety of processing.
In actual use, the second method may increase your drilling efficiency by 50% and cost zero!
Post time: May-27-2024
