The reason for the collision of the machining center tools

Due to improper operation or programming errors, it is easy for the tool or tool holder to collide with the workpiece or the machine tool. The light one will crash the tool and the machined parts, and the heavy one will damage the machine tool components, so that the machining accuracy of the machine tool will be lost, and even cause Personal accident. Therefore, from the point of view of maintaining accuracy, the collision between the tool and the machine tool or the workpiece is never allowed in the use of CNC machine tools.

The reasons for the collision can be summed up in about 9 points.

(1) Programming error

The process arrangement is wrong, the process undertaking relationship is not carefully considered, and the parameter setting is wrong.

Example: A. The coordinates are set to zero at the bottom, but in reality, the top is zero;

B. The safety height is too low, so that the tool cannot be completely lifted out of the workpiece;

C. The rough allowance for the second opening is less than that of the previous knife;

D. After the program is written, the path of the program should be analyzed and checked;

(2) Error in the remarks on the program sheet

Example: A. One-sided touch numbers are written as four-sided cents;

B. The clamping distance of the vise or the protruding distance of the workpiece is marked incorrectly;

C. When the remarks on the extension length of the tool are unknown or wrong, the tool collides with the tool;

D. The procedure sheet should be as detailed as possible;

E. The principle of replacing the old with the new should be adopted when the program sheet is changed: destroy the old program sheet.

(3) Tool measurement error

Example: A. The tool setting data input does not consider the tool setting bar;

B. The tool is installed too short;

C. Tool measurement should use scientific methods and use more accurate instruments as much as possible;

D. The length of the knife is 2-5mm longer than the actual depth.

(4) Program transmission error

The program number is wrongly called or the program has been modified, but the old program is still used for processing;

On-site processors must check program details before machining;

For example the time and date are programmed and simulated with the bear clan.

(5) Wrong tool selection

(6) The blank exceeds expectations, and the blank is too large and does not match the blank set in the program

(7) The workpiece material itself is defective or the hardness is too high

(8) Clamping factors, spacer interference and not considered in the program

(9) Machine tool failure, sudden power failure, lightning strike, etc.

As a high-precision machine tool, the CNC machine tool of CNC machining center is very necessary to avoid collision. It requires the operator to develop the habit of being serious and careful, and operate the machine tool in the correct way to reduce the occurrence of machine tool collision. With the development of technology, advanced technologies such as tool damage detection during processing, machine tool anti-collision detection, and machine tool adaptive processing have emerged, which can better protect CNC machine tools.