1. When turning the outer circle of the blank, a bevel should be turned first at the starting point.
2. Chips are most likely to be entangled at the beginning of the finish turning, the speed should be appropriately reduced, and the feed rate does not need to be too slow. Start chamfering, retract the tool by 3 mm, let the chamfering iron filings discharge, increase the speed, and then adjust to the rod diameter required later. The feed rate is linear turning.
3. During rough turning, the allowance of the current shaft diameter should be adjusted evenly without any taper (except sometimes to reduce the vibration of the cutter). Then gradually increase or decrease the margin (increase or decrease by 0.2mm), it can be solved.
4. The cutting fluid must be poured on the cutting part of the tool tip, and the position of the tip of the tool tip on the entire shaft should be taken into account.
5. The main deflection angle should not be too small. Make it as big as possible if you don't actually need it. The main deflection angle is usually 75° when the step axis is not at right angles.
6. Speed and feed rate.
1) When the groove cutter is turned, 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.
2) Chip knife, you only need to increase the feed rate (pay attention to ensure the roughness).
7. When cutting grooves with ordinary triangular groove cutters, and cutting grooves with a depth of about 1 mm or 2 mm without strict regulations, the margin becomes more with the addition of blank margins. In addition, in this case, in order to ensure the symmetry and The angle of the groove wall and the main deflection angle are small, so it is particularly easy to entangle chips.
1) First cut a section of blank with the same diameter as the outer circle at both ends, and then go to the outer circle of the blank to make a bevel, the angle is smaller than the leading angle of the current knife. Then return to the outer circle and start grooving. The feed speed should not be too slow, and the speed should be matched well. The speed is around 1500~1700r/min, but it does not have to be in this range, it can be determined according to the actual situation and product needs, the performance of the machine tool and the experience of the lathe worker).
2) For the sake of insurance, reduce the probability of chip entanglement, and ensure the reduction of corner burrs caused by excessive margin and pair of deflection angles rubbing workpieces. It is best to divide the lathe into two knives. During rough turning, the speed is appropriately reduced, and the feed rate is appropriately increased for turning, and a small margin is reserved for finish turning. When finishing, the speed and feed rate are increased to ensure roughness and aging.
8. The material of the product needs to choose a tool with appropriate hardness. Products with softer materials need groove knives with sharp blades and smooth chip removal. Products with harder materials need blunt blades. You can choose chipping knives, and there will be no Winding crumbs.
9. When using a slotted knife, do not let the iron filings drop vertically from the tip of the knife. An iron hook should be installed to allow the iron filings to hang down a certain distance from the workpiece.
10. When processing aluminum parts, do not use ordinary blades for turning steel parts to turn aluminum, and do not add cutting fluid, which will oxidize. Aluminum blades generally have a rake angle of 35°~45°. The tip of the blade must be sharp, the speed must be high, and the line speed should be around 800. That is, you should drive as fast as your machine tool can. Feed F value to a larger point, which is conducive to chip breaking. Aluminum generally has a large rake angle. To choose a suitable blade, note that aluminum is a non-ferrous metal. If you use a steel blade, it must be of poor quality and prone to stabbing.
