1. Relevant basis for tool change point adjustment of DMG five-axis machining center
(1) The relationship between the zero point of the machine tool and the tool change point
Determine if machine zero point is tool change point
First of all, it is necessary to clarify whether the zero point of the machine tool is the tool change point. Otherwise, you need to set the relative zero point deviation value in the system. This is an important early judgment step for adjusting the tool change point.
(2) Positioning angle of tool change position
Determining the tool grip position
The positioning angle of the tool changing position, that is, the position where the tool is gripped, is a key factor in adjusting the tool change point. For example, the M M63 command code commonly used in machining center machines has the function of opening the pneumatic door. This command can be linked to other operations during tool entry and tool change. This must be taken into account comprehensively when setting the tool change point. . Operating logic related to class instructions.
2. Tool change point adjustment steps
(1) Preparation work
Assembly and tightening of parts
Install the workpiece on the workbench through the clamp when clamping, space should be left on all four sides of the workpiece for tool adjustment. This step is to prepare for the subsequent tool adjustment operation, because whether the tool adjustment is precise or not is directly related to the precision of the tool change point adjustment, which in turn lathe affects the machining accuracy.
(2) Tool adjustment operation
Tool adjustment in X direction
Rotate the spindle at medium speed, move the worktable and spindle quickly, so that the tool quickly moves to a safe distance close to the left side of the workpiece, then slows down and moves to the left side of the workpiece. the room. When approaching the workpiece, switch to fine-tuning operation (usually use 0.01mm to approach), let the tool slowly approach the left side of the workpiece, so that the tool just touches the left surface of the workpiece (observe, listen to the cutting sound, watch the kerf, look for chips, if any. In one case, this means the tool is making contact with the workpiece) , then move back 0.01 mm and record the value of the X coordinate. Then retract the tool in the positive direction of Z until the tool is above the workpiece surface, then use the same method to approach the right side of the room. Note the X coordinate value displayed in the machine tool coordinate system at that time. , and calculate the X coordinate value of the part coordinate system. The coordinate value of the origin in the X direction in the machine tool coordinate system (for example, divide the two X coordinate values by 2 to obtain the coordinate value of the center point in the X direction). Finally, move to the center point and reset it. Enter the relative data (such as Settings – Relative Clear – X Clear – G54 – Enter the actual machine tool coordinates in G54 and XY of the workpiece coordinate system).
Tool adjustment in Y direction (if necessary)
If the operation of setting the tool in the Y direction is involved, a method similar to setting the tool in the X direction can be used to determine the coordinate values in the Y direction and other related parameters. This establishes an accurate workpiece coordinate system and lays the foundation for precise adjustment of the tool change point.
(3) Determine the tool change point
Adjust according to tool setting results
After completing the tool setting operation, based on the determined relationship between the workpiece coordinate system and the machine tool coordinate system, combined with the specific parameters of the five-point machining center DMG axes (such as the travel of each axis, the length of the tool and other factors that may affect the tool change), determine the specific location of the tool change point. Generally speaking, the position of the tool changing point should ensure that the tool does not collide with the workpiece, fixture and other parts of the machine tool during the tool changing process. tool. At the same time, the efficiency of tool change must also be improved. considered to minimize tool change travel time.
3. Precautions
(1) Accuracy of system parameters
Checking and adjusting parameters
In the process of adjusting the tool change point, the relevant system parameters should be carefully checked and adjusted to ensure that the machine tool can accurately perform tool change operations according to the tool change point. defined tool. For example, this may involve settings related to tool length compensation, coordinate axis offset, etc. An error in any parameter can result in tool change failure or machining accuracy issues.
(2) Security Considerations
Avoid the risk of collision
Always put safety first. When adjusting the tool change point, fully consider the movement path of the tool during the tool change process to avoid collision between the tool and the workpiece, fixture, table of the machine tool or other components. This may require simulation of the machining process or careful planning of the tool path.
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