How To Get Rid of Stringy Chips on Your Inserts?
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How To Get Rid of Stringy Chips on Your Inserts?
It's awful that our CNC turning insert got chips wrapped around it. Our tool's going to worn out prematurely. Or worse that it could break. Today I will share these ten tips and learn to process easily!
External turning
When turning the outer circle of the blank, the starting point should be turned with a bevel.
Reduce the speed at the begining of finishing
Chips are most likely to be wrapped around the beginning of finishing. At this time, we appropriately reduce the speed, the feed rate does not need to be too slow, and then start chamfering, retract the tool by 3 mm, let the chamfered iron filings discharge, increase the speed, and then use the feed speed required by the following rod diameter to turn straight.
Adjust the shaft diameter allowance
During rough turning, the current shaft diameter allowance should be adjusted uniformly, without taper (except sometimes to reduce vibration of the tool). Then gradually increase or decrease the margin (increase or decrease by 0.2mm) to solve it!
Cutting fluid
The cutting fluid must be poured on the cutting part of the tooltip, and the tip of the entire shaft must be drenched.
Entering angle
The entering angle should not be too small. If there is no actual need, try to make it bigger. When machining non-right-angle stepped shafts, the entering angle is usually 75°.
Reduce the speed with CNC thread inserts
When turning with CNC thread inserts, the faster the speed, the easier it is to wrap, especially at the starting point, the speed should be reduced, and the feed speed should be increased if necessary.
Cutting grooves
When cutting grooves with ordinary triangular thread inserts, when cutting grooves with a depth of about 1mm or 2mm without strict regulations, the margin becomes more when the blank margin is added, and in this case, to ensure the symmetry of the groove wall and the angle of the groove wall. The entering angle is small, so it is particularly easy to wrap.
- First cut a section of the blank with the same diameter as the outer circle at both ends, and then move toward the outer circle of the blank with an oblique angle that is smaller than the lead angle of the current cutter. Then return to the outer circle and start grooving. The feed speed should not be too slow, the speed should be matched, and the speed must not be too fast (when the feed rate override is 150%, the programming “F” value is between 160 and 260, the spindle The speed is about 1500~1700r/min, but it does not have to be in this range. It is determined according to the actual situation and product requirements, machine tool performance and lathe experience).
- For the sake of safety, reduce the probability of entanglement and ensure that corner burrs caused by rubbing the workpiece with too much margin are reduced. It is best to divide the turning into two tools. When rough turning, the speed is appropriately reduced, the feed rate is appropriately increased, and a small margin is reserved for fine turning. The speed and feed rate are increased during finishing to ensure roughness and aging.
Appropriate hardness
It is necessary to select a tool with appropriate hardness according to the material of the workpiece. For a softer workpiece, a threaded insert with a sharp edge and very smooth chip removal are required. A harder workpiece requires a slightly blunt edge.
Install an iron hook
When using CNC thread inserts, do not let the stringy chips fall vertically from the tip of the tool. You could install an iron hook to allow the stringy chips to hang down a distance from the workpiece.
Machining aluminum parts
When machining aluminum parts, do not use ordinary inserts for machining steel parts to turn aluminum and do not add cutting fluid, which will oxidize. Inserts for aluminum generally have a rake angle of 35°~ 45°. The tip of the insert must be sharp, the speed must be high, and the linear speed should be around 800. That is, you can drive as fast as possible. The feed F value is larger, which is good for chip breaking. Choose suitable CNC inserts. If you use inserts for machining steel parts, it must be of poor quality and easy to pierce the tool.
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