Twist drill can be used to drill holes with small depth. In order to remove chips smoothly, iron chips should be straight out into thin strips and bring out small fragments. At the same time, the coolant is easy to enter. The grinding method of drill bit can be the grinding method created by Ni Zhifu with three points and seven edges (called group drilling in order not to highlight individuals in the Cultural Revolution)
- Increase the angle of the drill edge to 130-140 degrees to increase the chip thickness and change the direction of chip discharge (the direction of chip discharge is perpendicular to the edge)
- Grinding the transverse edge to reduce the axial cutting tool, at the same time, the cutting edge near the core produces a break angle to facilitate chip separation.
- If the drilling diameter is large, the chip separation groove can be ground on one side of the cutting edge to balance the cutting force of the two cutting edges. If the diameter is large, the chip separation groove can be grinded at the two cutting edges.
- Reverse 1 mm 45 degrees to the outside corner of the edge to reduce wear and improve finish.
5。 The drilling speed is slightly lower, and the feed rate should be larger, so that the chip thickness is discharged in a strip shape.
- The nozzle of the coolant should face the hole inward to facilitate the coolant to enter the cutting area,
Mold deep hole processing manufacturers found that when the hole diameter ratio is more than 8 times and the batch is large, it is best to drill on a special deep hole drilling machine, which has high efficiency. It has tried to produce lathe spindle diameter of 32 and length of about 850 mm, and 45 steel only takes 13 minutes.
Deep hole drilling can be divided into external chip removal and internal chip removal. The smaller diameter drill pipe adopts the external chip removal method, because the drill pipe is too small. There is enough space for chip removal in the inner hole of the drill pipe for the larger diameter hole. High pressure oil is pressed between the hole wall and the drill pipe to discharge the chips and heat from the rod. The drill bit is specially made and generally uses cemented carbide, which is divided into two parts: the direction and the cutting edge, The chip edge is ground into a trapezoid to separate chips. The height and width of the chip breaking groove depend on the material and feed rate of the workpiece. It is better to ensure that the chip shape is compact and small in shape of C or tile.
报错 笔记
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