Features of deep hole drilling machine and chip removal solution
Characteristics of deep hole drilling machine
The continuous development of science and technology has driven the advance of all walks of life. In the deep hole processing, deep hole drilling machine is an essential mechanical products, so the deep hole drilling machine processing what characteristics? If you still do not know, follow small make up to see.
1, the tool bar is restricted by the aperture, the diameter is small, the length is large, the formation of rigidity is poor, the strength is low, the cutting prone to vibration, ripple, taper, and affect the straightness of the deep hole and the surface roughness.
2, in drilling and reaming, cooling fluid in the absence of special equipment, it is difficult to input to the cutting area, so that the tool durability decline, and chip removal is difficult.
3, in the deep hole processing process, can not directly investigate the cutting conditions of the tool, can only rely on working experience to listen to the cutting sound, see chip, hand touch oscillation and workpiece temperature, look at the surface (oil pressure meter and electricity meter), to determine whether the cutting process is normal.
4, chip cleaning difficult, it is necessary to choose a reliable way to chip breaking and control the chip length and shape, in order to facilitate smooth cleaning, avoid chip blocking.
5, in order to ensure the deep hole in the processing process smoothly and reach the required processing quality, the tool should be added inside (outside) chip removal equipment, tool guide and support equipment and high-pressure cooling smooth equipment.
Usually, the hole depth is 3-5 times more than the aperture, which is called the deep hole, and it is difficult to use the twist drill in the small hole of the chip discharging and cooling borehole depth, in order to smooth chip discharging, the iron scrap should be made into thin strips straight out and bring out the smaller debris, together with the coolant simply enter. The grinding method of the drill bit can choose a relatively simple grinding method.
1. Increase the included Angle of drill edge to 130-140 degrees to add chip thickness and change the direction of chip discharge (the direction of chip discharge is straight with the edge)
2. Grind the transverse edge to reduce the axial cutting tool. The cutting edge will be chamfered at the core to separate chips.
3, if the drill diameter is larger, can be in a cutting edge grinding chip slot, to a wider, in order to balance the cutting force of the two edges.
4, in the edge Angle of 1 mm 45 degrees to reduce wear and improve the finish.
5, the drilling speed is slightly lower, the amount of feed to take some large, such chip thickening to strip out.
6. The nozzle of the coolant should be facing the hole to enter the cutting area of the coolant.
When the hole is larger than 8 times the batch size, it is better to drill in a special deep hole drilling machine with very high efficiency. I have tried to produce the lathe spindle with a diameter of 32 mm and a length of about 850 mm.
Deep hole drill can be divided into two kinds of chip discharging: outer chip discharging and inner chip discharging:
Small diameter of the selection of external chip, because the drill pipe is too small to chip. The hole in the drill pipe with large diameter has enough space to discharge cuttings. High-pressure oil pushes in between the hole wall and the drill pipe to discharge cuttings and heat from the pipe. The drill bit is specially made and usually made of hard alloy. It has two parts: guide and chip edge. The chip edge is ground into a trapezoid to separate chips.
