Application Research of Visualization Technology in Error Analysis of Machine Tool Spindle
The spindle of the machine tool is like a human arm and is a key component of the machine. The performance of the spindle will directly affect the final performance of the machine. Error testing of machine tool spindles has become a must for machine performance testing, error analysis and factory inspection. Machine tool spindle error test generally includes spindle runout detection (including axial and radial), spindle thermal deformation detection, static stiffness detection and other items. Through the VTK development platform, this paper combines the spindle error detection system (beating detection and thermal deformation detection) to apply the visualization technology to the spindle error analysis. By introducing the machine model and displaying the spindle error in 3D, it can be viewed from the overall perspective of the machine tool. To examine and consider the impact of error on the machine tool, it has received the effect that can not be compared with the text description and the two-dimensional chart, which has a good reference value for the performance analysis and structural optimization of the machine tool.
Spindle error test system
The spindle error test system uses a set of test devices developed by Shenyang Machine Tool (Group) Design and Research Institute. The test system includes software and hardware. The test software is mainly responsible for parameter setting, channel setting and real-time display and saving of data. The underlying development is carried out in C++, and the upper interface design is carried out in C#. The software takes into account the system's rapid responsiveness and provides a user-friendly interface. Figure 1 shows the main interface of the system software. You can complete most of the software operation in the main interface without switching to other windows, such as channel color setting, sampling time, sampling data processing mode, image display range, and laser displacement sensor switch. Etc., bringing great convenience to the actual test work.
Figure 1 Data acquisition main interface
Figure 2 shows the software configuration interface, which can perform hardware parameter setting, channel setting, etc. All parameters will be saved to the XML configuration file, and the configuration file will be automatically loaded when the software starts.
Figure 2 data acquisition configuration interface
The hardware part mainly includes 2 pieces of IF2004 data acquisition card produced by Mi Fu Company, 4 channels each; 5 laser triangular reflection type displacement sensors, measuring range is 24~26mm; 5 controllers, 1 24V power supply module and connection Cable and 1 industrial computer, etc., Figure 3 is a schematic diagram of one-channel hardware connection.
Figure 3 Schematic diagram of one-channel hardware connection
According to the hardware configuration, the test system can simultaneously perform 5-channel data acquisition. The measurement frequency is 10 kHz per channel. The general installation mode is one spindle axis, and the other two directions are two. The spindle X, Y, Z can be measured simultaneously. The displacement data of the direction can also calculate the inclination angle of the main shaft in the radial direction through data processing. The specific installation method of the laser displacement sensor is shown in Fig. 4.
Figure 4 Schematic diagram of the installation of the spindle error measuring device
1. Spindle check rod 2. Laser displacement sensor 3. Bracket
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