Display verification method of tool path for five-axis blade machining

The most commonly used verification method for blade machining programs is the tool path display verification method, which is to display the wireframe of the tool position data (tool center coordinates and tool axis vector), determine whether the tool position path is continuous, check whether the tool position calculation is correct, and then Display the tool position data together with the wireframe diagram of the machined surface to determine whether the tool position trajectory is correct, whether the tool path, and the method of advancing and retracting the tool are reasonable.

The basic idea is: extract all processing surfaces and related profiles from the surface modeling results, extract the tool location trajectory information from the tool location calculation results (tool location file), and then combine them for display, or display them on the selected tool location. Place the tool model on the position, and then move the tool model along the tool path to determine whether the tool center position, tool axis vector, relative position of the tool and the machined surface, and the way of advancing and retracting the tool on the tool path are reasonable.

1. Tool position trajectory display verification

Verification method for blade tool position trajectory display: After the blade CNC machining program is generated, the tool position trajectory is displayed on the graphic display to determine whether the tool position trajectory is correct. Among them, the feed speed, tool selection, program line number and other information in the CNC machining program should be removed first, and only the verification information should be displayed. Then perform “inverse post-processing” on the tool path information, and after obtaining the CNC machining program containing the tool path information, draw the tool path. Now let’s illustrate this point with a few lines of four-coordinate CNC machining program for processing the inlet and outlet edges of large blades:


The three coordinate values X, Y, and Z in this program are the values after the rotary table rotates by angle A. If you want to find the tool position coordinates when processing this point, you should perform the following “inverse post-processing” calculation


The calculated (x1, y1, z1) is the tool location point coordinates, and this tool location file can be used to draw the tool location trajectory.

Judgment principles for tool position path display verification:

1. Whether the tool position path is continuous; • Whether the starting point of the tool position is reasonable;

2. Whether the tool path is smoothly connected;

3. Whether the tool position trajectories intersect;

4. Is the empty trip necessary?

5. Whether there is a sudden change in the cutter axis vector;

6. Whether the connection of the tool path at the concave and convex points is reasonable;

7. Is the tool position trajectory reasonable when processing combined curved surfaces?

8. Whether the cutting direction conforms to the shape of the surface.

2. Verification of the combined display of the machining surface and tool position path

The basic method of combined display verification: display the tool position trajectory and the wire frame of the processing surface on the graphic display at the same time, so as to determine whether the tool position trajectory is correct, and whether the tool path and advance and retreat methods are reasonable.

Judgment principles for combined display verification methods:

1. Whether the relative position of the tool path and the machined surface is reasonable;

2. Whether the offset direction of the tool path meets the actual requirements;

3. Is there any interference between the tool and the machined surface?

4. Are the advance and retreat tool positions and methods reasonable?

In summary, the display verification method is a method suitable for verifying the tool position trajectory of the blade profile, especially the blade tip and blade root fillets. It is highly intuitive and easy to implement, especially when rotating from three coordinates on a computer monitor. Directional observation is more accurate.

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