Inappropriate operation or programming error, etc., easy to make the tool or tool holder hit the workpiece or machine tool, the light will hit the tool and the parts being machined, the more serious will damage the machine tool parts, the machine's machining accuracy loss, and even the formation of Personal incidents. Therefore, from the point of view of maintaining accuracy, in the use of CNC machine tools, the tool and the machine tool or the workpiece must not be allowed to collide. Under the face of the reasons for hitting the knife to be summarized and analyzed. Analysis of the causes of the machining center's collision tool <br><br><br> Since the CNC machining center is locked by the use of software, in the imitation process, when the automatic operation button is pressed, it is not intuitive to see if the machine tool is locked. There is often no counter knife when imitating, and if the machine tool is not locked and running, it is easy to attack the knife. Therefore, before the imitation process should be to the operating interface to recognize whether the machine is locked. Forget about closing the air switch when processing. Due to the imitation of the program, in order to save time, the idle operation switch is often turned open. Dry run means that all the machine axes of the machine run at G00 speed. If the processing time and space switch is not closed, the machine ignores the given feedrate and runs at the speed of G00 to form a knife or a collision with the machine. After the imitation of air, it did not return to the reference point. During the verification procedure, the machine tool is locked and the tool is processed relative to the workpiece (simulated coordinates and relative coordinates are changed). At this time, the coordinates do not match the actual orientation, and the reference point must be used to ensure the machinery. Zero coordinates are common with both positive and negative coordinates. If a machining operation is performed without finding a problem after the verification program, a tool bump will be formed. The direction of over-exemption is not correct. Tube Conveyor,Tube Conveyor Machinery,Flour Mill Tube Conveyor,Flour Conveying Machine HEBEI PINGLE FLOUR MACHINERY GROUP CO., LTD , https://www.plrollermill.com
When the machine tool is overtravel, you should press and hold the overtravel relief button and move it in the opposite direction manually or by hand to eliminate it. However, if the direction of the exemption is reversed, it will damage the machine. Since the over-travel maintenance of the machine tool will not work when the over-travel exemption is pressed, the travel switch for over-travel maintenance is already at the end of the trip. At this moment, the worktable may continue to move in the direction of overtravel, eventually breaking the screw and causing damage to the machine. The cursor position is not correct when the specified line is running. When the designated line is running, it is often performed from the beginning of the cursor position to the down position. For the lathe, the tool offset value of the tool used for the call is required. If the tool is not called, the tool in the running program may not be the desired tool. It is highly likely that a tool collision occurs due to different tools. Of course, in the machining center and CNC milling machine, we must first call the coordinate system such as G54 and the length compensation value of the tool. Since the compensation value of the length of each knife is different, it is also possible to form a collision tool if it is not called.
CNC machining center CNC machine tools as high-precision machine tools, collision avoidance is very necessary, requiring the operator to develop a careful and careful habits, according to the correct method of operating the machine tool, reducing the incidence of machine tool collision knife. Along with the development of skills, there are advanced skills such as tool damage detection, machine tool anti-impact detection, and machine tool adaptive processing in the machining process, which can better maintain the CNC machine tools.
Summarize 9 reasons:
(1) Errors in the preparation process of the program, faults in the procedures and contact, and faults in parameter settings.
Example: A. Coordinates are set to zero at the end, but in practice they have a top of 0;
B. The safety height is too low, resulting in the tool can not fully lift the workpiece;
C. The second open coarse margin is less than the previous one;
D. After the program is written, it should analyze the path of the program.
(2) Remarks on procedure notes: A. The number of unilateral touches is divided into four sides;
B. Marking errors in vise clamping interval or workpiece protrusion interval;
C. tool sticking length Remarks: Unknown or wrong;
D. Procedures should be as specific as possible;
E. When the program is changed, it should use the principle of replacing the old ones: destroy the old ones.
(3) Tool measurement error example: A. The tool input data does not consider the tool holder;
B. The cutter is too short;
C. The use of scientific methods to measure the tool, as far as possible the use of more accurate instruments;
D. The length of the tool is 2-5mm longer than the actual depth.
(4) The program transmits the fault program number call fault or program modification, but still uses the old program for processing;
The on-site processor must see the specific data of the program before processing;
For example, the time and date of program writing, and imitation with the bear family.
(5) Faults in tool selection
(6) Blank exceeds expectations, oversize blank does not match programmed blanks
(7) The workpiece data has its own fault or hardness is too high
(8) Clamping elements, pads do not consider in the program
(9) Machine tool problems, sudden power failure, lightning strike resulting in collision with a knife, etc.