Non-contact machining trajectory error measurement device for machine tools

Abstract

This invention relates to a non-contact machining trajectory error measurement device for a machine tool. It comprises a computer device, an optical spherical lens module, and an optical path analysis module. The computer device is electrically connected to a machine tool and includes a human-machine interface, CAD / CAM software, a machining trajectory generation module, an error model evaluation module, and an error compensation module. The optical spherical lens module is mounted on the spindle of the machine tool to simulate the machine tool's cutting tool and includes a lever and a spherical lens. The optical path analysis module is mounted on the machine tool's worktable and is connected to the spindle. The computer device is electrically connected to measure the position of the optical ball lens module. The optical path analysis module is equipped with a laser emitter and at least two optical sensing receivers. Using the optical sensing path point analysis method, the relative motion between the spindle cutting tool and the workpiece during rotation is simulated in a non-contact manner. The coordinates and error values ​​of the actual response of the motion trajectory of each path point in space are quickly obtained. Subsequently, the path data is extracted through analysis to analyze the error caused by the actual machining path under the actual machine operation. Then, the machining accuracy is improved and the trial and error cost is eliminated through parameter improvement.

Claims

1. A non-contact machining trajectory error measurement device for a machine tool, comprising a computer device, an optical spherical lens module, and an optical path resolution module, wherein: The computer device is electrically connected to a machine tool and includes a human-machine interface, CAD / CAM software, a machining trajectory path generation module, an error model evaluation module, and an error compensation module. The human-machine interface is used to acquire relevant data and coordinate information of the machine tool. The CAD / CAM software is used to perform 3D modeling of a workpiece and convert it into a machining path. The machining trajectory path generation module is used to generate a multi-axis simultaneous motion path with the center point of the rotating tool following the motion. The error model evaluation module is located in the computer device and is used to perform error analysis on the measurement results. The optical spherical lens module is mounted on the spindle of the machine tool to simulate the cutting tool of the machine tool. The optical spherical lens module has a rod and a spherical lens. The rod is fixedly connected to the spindle of the machine tool, and the spherical lens is located at the end of the rod away from the spindle. The optical path resolution module is mounted on the worktable of the machine tool and electrically connected to the computer equipment to measure the position of the optical spherical lens module. The optical path resolution module has a laser emitter and at least two optical sensor receivers. The position of the spherical lens of the optical spherical lens module is measured by the laser emitter and the at least two optical sensor receivers.

2. The non-contact machining trajectory error measuring device for machine tools as described in claim 1, wherein the following motion path is a machining path generated by the workpiece in the machine tool performance test according to ISO 10791-7, which has an S-shaped or S-shaped motion capable of moving within a small range while performing a large-range trajectory motion.

3. The non-contact machining trajectory error measuring device for machine tools as described in claim 1, wherein the computer device is provided with a displacement signal processing module, which is used to process the signal captured by the human-machine interface.

4. The non-contact machining trajectory error measurement device for machine tools as described in claim 1, wherein the computer device is equipped with a machine network communication module, which is used to sense the machining parameters and controller parameter signals of different controllers, such as machine coordinate signals, feed rate, spindle speed and other parameters that affect the motion trajectory and machining trajectory.

5. The non-contact machining trajectory error measuring device for a machine tool as described in claim 4, wherein the computer device is provided with a sensor signal processing module, the sensor signal processing module being used to process a microscopic dynamic error signal captured by the sampling frequency of the optical sensor receiver.

6. The non-contact machining trajectory error measurement device for machine tools as described in claim 5, wherein the computer device is provided with a signal data synchronization module, which is used to process the synchronous processing of the sampling frequency of the machine tool controller and the sampling frequency of the optical sensor receiver. It includes an interpolator to compensate for the dynamic insufficiency of the controller's sampling frequency and restore the micro-dynamic error signal and the machine coordinate signal into a multi-axis virtual machining trajectory.

7. The non-contact machining trajectory error measurement device for machine tools as described in claim 1, wherein the error model evaluation module includes a machine tool error model and an AI algorithm model, the machine tool error model and the AI ​​algorithm model being located in the computer device for error analysis of the measurement results.

8. The non-contact machining trajectory error measuring device for a machine tool as described in claim 1, wherein the optical path resolution module is mounted on the worktable of the machine tool via a fixed fixture to simulate a workpiece reference for a workpiece to be machined.

9. The non-contact machining trajectory error measuring device for a machine tool as described in any one of claims 1 to 8, wherein the optical path resolution module can be a 3D sensing head module, through which the 3D sensing head module senses the change in the center of the spherical lens, thereby sensing the change in the XYZ direction error of the center of the spherical lens.

10. The non-contact machining trajectory error measuring device for a machine tool as described in claim 9, wherein by mounting an optical ball lens module on the machine tool spindle and then mounting the 3D sensing head module on the worktable, dynamic error and thermal error data caused by the movement of the machine tool spindle can be acquired.

11. The non-contact machining trajectory error measuring device for a machine tool as described in claim 10, wherein each of the optical sensing receivers of the 3D sensing head module can be a non-contact 2D displacement optical sensing receiver, and the at least two 2D displacement optical sensing receivers can be configured in an orthogonal form to sense the change in the position of the center of the spherical lens.

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