The aircraft girder plays an important role in aircraft flight. The uneven wall thickness processing directly affects the aircraft's flight performance. The quality of the girder processing directly affects the flight safety of the aircraft. In the past, equipment used to machine large beams for domestic aircraft mainly used ordinary hydraulic profiling equipment, which resulted in low processing efficiency, low processing quality, and a poor working environment. Girder processing was mainly accomplished by special tooling, and the output was very low, far from meeting national defense construction and economic construction. The needs of the country seriously affect national security. Can only rely on imported special equipment, but for this type of "high, fine, sharp" CNC machine tools, Western developed countries have always taken restrictions and closures on our country, leading to the slow development of China's aerospace and aviation technology.
The XHF2707 Gantry Mobile High-speed Profiling Compound Machining Center independently developed by the Jinan No. 2 Machine Tool Group for processing military aircraft beams is one of the national “863 Project” high-, precision-, and sharp CNC machine tool development projects; the development of the CNC machine tool was successful. After being put into use, it has completely solved the processing precision of aircraft girders and improved the production efficiency.
The two spindles on the swing of the numerically-controlled machine tool are used to clamp the tool, and the rotation of the swing wheel drives the rotation of the tool. The accuracy of the rotation of the swing frame is an important technical indicator of the machine tool, and its accuracy directly affects the processing of the aircraft beam. Accuracy. However, the rotation accuracy of the pendulum does not have a very good detection method and method. We use the sine ruler and the level meter to measure the rotation accuracy of the pendulum by using the structure of the pendulum and the rotation principle. Through the later processing verification of the product, the detection method and The method is simple and reliable.
The technical requirements of the swing frame: Within the range of ±12° of the effective rotation angle of the swing frame, the positioning accuracy is 16′′, and the repeat positioning accuracy is 6′′. This standard is JIS-B6330.

The center of rotation of the main shaft is offset by 100 mm from the center of rotation of the swing frame. The center of rotation of the swing frame is the intersection of the space and is virtual. It is impossible to install measuring instruments and place measuring instruments in the center of rotation. According to the structure of the machine's swing frame, the swing part can be used as a rigid body. According to the sine ruler measurement principle, the sine ruler and the image level meter can be placed on the top surface of the swing frame. The measured angle is the rotation of the swing frame. angle.

Inspection Step 1. Put a horizontal frame in the horizontal and vertical directions on the work table and adjust the worktable to earth level.
2. A test spindle is installed in the two spindle taper holes of the swing frame, and a frame type level meter is placed on the spindle so that the spindle is parallel to the work table surface. If there is an error, rotate the yaw to parallel.
3. As shown in the above figure, a horizontal leveler is placed horizontally on the swing frame, and a 200mm sine ruler is placed below the leveler to connect and fix the sine ruler. The sine ruler is positioned longitudinally and laterally. At 0°, the reading level is zero, which is the reference point for the measurement.
4. The clockwise rotation of the yoke is positive at 0° and negative at the counterclockwise, and the sinusoidal ruler measurement plane is parallel to the reference point by calculating the sine ruler under 200mm. Rotate 3°, 6°, 9°, 12°, 15° in turn, back to 12°, 9°...-12°, -15°, then back to -12°, -9°... To 0°. Read, change blocks for every 100 seconds of rotation during the measurement. After the measurement, the pendulum is adjusted and compensated according to the measured value.
5. According to the principle of sine ruler, by calculating the rotation of the swing frame by 3°, the dimensions of the gauge block are obtained: 10.4620 mm at ±3°; 20.9057 mm at ±6°; 31.2869 mm at ±90; and 41.5823 mm at ±12°.
6. For every measurement of 3° rotation, measured value = reading value - nominal value. At 0°, the measured value is clockwise (forward) is a1↑, counterclockwise (reverse) is measured as a1↓; clockwise rotation is 3°, At this point, the measured value is forward b1↑, and the counterclockwise rotation to this point is the measured b1↓; the measured value is c1↑c1↓ when rotated to 6°, and the measured value is d1↑d1 when rotated to 9°. ↓; Rotation 12 ° measured value is e1 ↑ e1 ↓, counterclockwise rotation to -3 ° measured value is f1 ↑ f1 ↓; -6 ° measured value is g1 ↑ g1 ↓; -9 ° measured value is h1 ↑ h1 ↓ At -12°, the measured value is i1↑i1↓.
7. Run program cycle mode CSUBI
GOG91C3
C4F10O
M17
CSUB2
GOG91C-3
G4F100
M17
CSUB15
G90G54
GOCO
CSUB1 P4
GOG91C3
C-3
G4F100
CSUB2P8
GOG91C-3
C3
CSUB1 P4
M5
8. List of measured values ​​1) Positioning accuracy measurement:

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