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Flame cutting machine safety issues

Edit:Xuzhou Yahong CNC Equipment FactoryUpDate:2018-11-23

Safety issues that should be paid attention to during the use of CNC flame cutting machine

The origin of the workpiece coordinate system set by the programmer during programming should be outside the workpiece blank, at least on the workpiece surface.

Under normal conditions, the origin of the workpiece coordinate system can be set anywhere, and only this origin has a certain relationship with the origin of the machine coordinate system. However, in actual operation, if the command value is zero or close to zero, the tool will point directly to zero or close to zero. When machining the CNC flame cutting machine, the tool will run to the machine table or the base of the fixture: when machining the CNC flame cutting machine, it will run to the base of the chuck. In this way, the tool will penetrate the workpiece directly to the reference plane. At this moment, if it is moving fast, it will cause an accident.

The feed rate of the CNC flame cutting machine has been from 16m/min in the 1980s to the current 24~40m/min. The spindle speed of the machine tool has also increased from 2500r/min to 6000~40000r/min. The structure of the CNC flame cutting machine is also open. The type changes to a closed type. In the case of such high speeds and constructions, once the operator has no time to press the emergency stop button due to programming and operational errors, the tool has collided with the workpiece. To avoid machine and personal accidents, the following measures can be taken during programming and operation (take the FANUC system as an example).

FANUC CNC flame cutting machine system is generally set: when the decimal point is omitted, it is a small input unit, usually μm. When the decimal point is missed, the value entered will be reduced to one thousandth, at which point the value entered will be close to zero. Or, for other reasons, the tool should have left the workpiece but did not actually leave the workpiece and enter the workpiece. When this happens, the zero point of the workpiece coordinate system should be set outside the workpiece or on the base of the table (or fixture), and the result will be different.

Programmers and operators should be careful about the decimal point when writing a program.

FANUC

CNC flame cutting machine

The system sets a small unit when omitting the decimal point, and most domestic systems and some systems in Europe and America, when omitting the decimal point, is mm, which is the calculator input mode. If you are used to the calculator input method, there will be problems on the FANUC CNC flame cutting machine system. Many programmers and operators may use both systems. To prevent the size from becoming smaller due to the decimal point, a decimal point should be added to the calculator input method. In doing so, it is superfluous for certain types of systems, but after getting into the habit, there will be no problems with the decimal point.

In order to make the decimal point conspicuous, the isolated decimal point is often written in the form of ".0" during programming. Of course, zeros after the decimal point of the value are ignored when the system is executing.

When adjusting the workpiece coordinate system, the operator should set the reference point outside the physical (geometric) length of all tools, at least at the tool point of the long tool.

For the workpiece coordinate system on the workpiece installation drawing, the operator obtains the machine coordinate system offset on the machine. That is, the operator sets a reference point on the machine tool and finds the size between the reference point and the zero point of the workpiece coordinate system set by the programmer, and sets this size as the workpiece coordinate system offset.

On the CNC flame cutting start, the reference point can be set at the tool holder rotation center, the reference tool tip or other orientation. If no other motion is added, the zero commanded by the programmer, that is, the reference point of the tool holder (machine tool) moves to the zero position of the offset. At this moment, if the reference point is set at the center of rotation of the tool holder, the tool holder must collide with the workpiece. To ensure that there is no collision, the reference point on the machine should not only be placed outside the tool holder, but also outside the tool. This way, even if the tool is mounted on the tool holder, the reference point will not collide with the workpiece.

On the CNC flame cutting machine, the reference points of the X and Y axes are on the spindle axis. However, the reference point of the Z axis can be set at the spindle end or at a point other than the spindle end. If at the spindle end, when the command is zero, the spindle end will reach the zero position specified by the coordinate system. At this point, the end face key of the spindle end will collide with the workpiece: if the spindle is loaded with a tool, it must collide with the workpiece. To ensure no collision, the reference point on the Z axis should be set outside of all tool lengths. The reference point does not hit the workpiece even if no other motion is attached.