What Problems Should Be Paid Attention To When Deep Hole Processing?

(1) Key points of deep hole machining operations: the coaxiality of the center lines of the spindle and tool guide sleeve, tool holder support sleeve, workpiece support sleeve, etc. should meet the requirements; the cutting fluid system should be unblocked and normal; there should be no center on the machining end of the workpiece Holes, and avoid drilling on the inclined plane; the chip shape should be kept normal to avoid the generation of straight band-shaped chips; the through hole should be processed at a higher speed. When the drill is about to drill through, the speed should be reduced or the machine should be stopped to prevent damage to the drill.

(2) Cutting fluid for deep hole machining: A large amount of cutting heat will be generated during deep hole machining, which is not easy to spread. It is necessary to supply sufficient cutting fluid to lubricate and cool the tool. Generally, 1:100 emulsion or extreme pressure emulsion is used; when higher processing accuracy and surface quality or processing tough materials are required, extreme pressure emulsion or high concentration extreme pressure emulsion is selected. The kinematic viscosity of the cutting oil is usually selected (40 degree ) 10 20cm2/s, cutting fluid flow rate is 15 18m/s; when the machining diameter is small, use cutting oil with low viscosity; for deep hole machining with high precision, you can choose 40 percent extreme pressure vulcanized oil with cutting oil ratio plus 40 percent kerosene plus 20 percent chlorinated paraffin.

(3) Precautions for using deep hole drills:

A. The end face of the workpiece is perpendicular to the axis of the workpiece to ensure reliable end face sealing.

B. Pre-drill a shallow hole on the workpiece hole before the formal processing, which can play a guiding and centering role when the drill is piloted.

C. In order to ensure the service life of the tool, it is better to adopt automatic cutting.

D. If the guide elements of the feeder and the support of the activity center are worn, they should be replaced in time to avoid affecting the drilling accuracy.