The application of deep hole drilling machines should also not be carried out blindly; problems may arise in practical use

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This post was last edited by ztj1118 on 2015-8-15 07:57. The use of deep-hole drilling machines should not be done blindly; various problems may arise in actual applications, and at such times it is important to pay close attention and operate correctly. In other words, the precautions for using deep hole drilling machines are things that users need to understand and be able to address promptly. When a deep hole drilling machine is used for deep hole machining, it operates in a closed or semi-closed state; therefore, it is not possible to directly observe the cutting condition of the tool. At present, it is only possible to rely on experience to determine whether the cutting process is normal by listening to sounds, observing chips, checking the load on the machine tool and the readings on pressure gauges, as well as feeling vibrations and other visible signs. Deep hole drills, deep hole drilling machines – the heat generated during cutting does not dissipate easily. During normal cutting processes, 80% of the heat generated is carried away by the chips, while in deep hole drilling only 40% is removed in this way. The tool accounts for a large proportion of the heat generated; heat dissipation is slow, and overheating can occur easily, with the tool edge temperature reaching up to 600 degrees. Therefore, effective forced cooling methods must be employed. The chips are not easy to remove. Due to the large hole depth, the chips have to travel a long distance, which makes clogging likely and can lead to the drill bit breaking. Therefore, the length and shape of the chips must be controlled, and forced chip removal is required. The process system has poor rigidity. Due to the limitations imposed by the hole diameter on deep-hole drilling machines, the length-to-diameter ratio of the holes is relatively large; the drill rods are thin and long, resulting in poor rigidity and susceptibility to vibration, which causes the holes to deviate from their intended path. Therefore, support and guidance are essential. Precautions for deep hole drilling operations: 1. Correct sequence for turning the machine on and off: After powering on, wait until the system startup screen is fully displayed before starting the machine; when shutting it down, first stop the machine in an appropriate position, and then turn off the power switch in the control cabinet. 2. After the machine tool is started, before moving any of its axes, it is necessary to check for any obstacles that might interfere with the movement of the drill machine, as well as to ensure that there are no tools (such as wrenches) or other items left in the working area. If everything is fine, then proceed with the operation to return to the reference point. 3. Do not operate the machine tool while wearing gloves, and do not touch the machine tool panel if your hands are oily. 4. Before manually moving the machine tool, set the feed rate to a very low level. First, start the machine tool and ensure the direction is correct before increasing the feed rate. Operating the machine tool requires great care; one must keep their eyes and hands in sync to avoid turning the wrong knobs or pressing the wrong buttons. During the movement of the machine tool, it is important to watch out for any potential collisions with the workpiece or fixtures, and the feed rate should be reduced when approaching the workpiece. 5. After locating the origin each time, it is necessary to verify in MDI mode to confirm that the coordinate system and coordinate values are correct. 6. The distance between the guide sleeve of this machine tool and the workpiece surface when it is pushed out can be adjusted, to ensure that the guide sleeve is in the proper position; otherwise, the drill bit may come into contact with the workpiece and cause damage. Make sure that all the fixing screws of the bent plate and the workbench are tightened. 7. Correct steps to move the machine tool away from the workpiece: 1) The Z-axis should retract first. 2) X or horizontal axis movement. Program modifications must be handled with great care: the main program should call subroutines correctly, the parameters used by the subroutines should be appropriate, and the program should be checked at least once after any modifications are made. When managing programs, it is necessary to prevent them from being accidentally deleted or overwritten. 8. When the automatic program is processing workpieces, monitor parameters such as speed, torque, flow rate, and pressure, and adjust the alarm threshold values in a timely and proper manner. After machining the first hole, modify the corresponding parameters in the subroutine. 9. When an alarm indicating that power or torque exceeds 30% occurs during processing, it is necessary to withdraw the drill rod to check whether the drill bit is damaged. 10. During shift handover, written records must be kept, and oral instructions must also be provided. At the end of work, tools and protective gear must be returned to their proper places; they must not be left in the work area. 11. When a machine tool gives an alarm and cannot operate properly, it is necessary to record the program number, alarm code, time of the alarm, and the operations being performed on the machine tool at the time of the alarm, so as to provide reference for maintenance.