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Precautions for the use of roller cone bits

by:Ronix Tools     2021-06-02
The use of roller cone bits:    1. The roller cone bits should be packed in a special packaging box to prevent vibration from colliding with each other.   2. After using, take out the cone bit from the packing box and install it into the spring chuck of the spindle or the tool magazine for actively changing the cone bit. Put it back in the box immediately after use.  . To measure the diameter of the cone bit, use a non-contact measuring instrument such as a microscope to prevent the cutting edge from being injured by a collision with the machine measuring instrument. 4. Some CNC drilling machines use positioning rings. Some CNC drilling machines do not use positioning rings. If the positioning ring is used, the depth positioning must be correct when the positioning ring is used. If the positioning ring is not used, the elongation of the roller cone bit installed on the spindle To adjust the equality, the multi-spindle drilling machine must be more detailed, so that the drilling depth of each spindle must be the same. If the discrepancy causes the roller cone bit to drill to the table or fail to electric drill through the route plate, it may be scrapped. 6. Always check the concentricity of the spindle and collet chuck and the clamping force of the collet chuck. If the concentricity is not good, it will cause the small diameter cone bit to break the drill and the large hole diameter. If the clamping force is not good, it will cause the actual situation. The rotation speed is not suitable for the set rotation speed, and there is slippage between the chuck and the cone bit.   Seven. The clamping length of the fixed shank roller bit on the spring chuck is 4 to 5 times the diameter of the drill shank before it can be clamped firmly.   8. Always check the spindle presser foot. The contact surface of the presser foot should be level and perpendicular to the main shaft and cannot swing to prevent broken drills and offset holes during drilling.   Nine, the results of the vacuuming of the electric drill press are better, the vacuuming air can lower the temperature of the cone bit, and work together to take away the dust and reduce the low temperature caused by friction.  11. When ordering the manufacturer’s roller cone bit, it is necessary to check whether 4% of it is suitable for delimitation when entering the factory for inspection. And 100% of the nicks, scratches and cracks are checked with a microscope of 10 to 15 times.  12. The cone bit should be regrinded, which can increase the use and regrind times of the cone bit, delay the life of the cone bit, and reduce the production cost and expenditure. When measuring with a microscope, the wear depth should be less than 0.2mm within the full length of the two main cutting edges. When resharpening, 0.25 younger sister is to be polished away. Ordinary fixed shank roller cone bits can be reground 3 times, and undercut cone bits can be reground 2 times. Excessive grinding will reduce the quality and accuracy of the drilling, which will cause the scrap of the line board products. Excessive grinding results in plucking seedlings. 10. Setting of roller cone bit parameters. Under normal circumstances, the manufacturer will provide a parameter table of the drilling speed and lower speed of the roller cone drill bit produced by the factory. This parameter is only for reference. Use the rotational speed and down-speed parameters of a roller cone bit suitable for the actual environment. The actual parameters are different from the reference parameters, but the difference is not too much.
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