CN110757251A

CN110757251A - Numerical control laser scanning equipment

Info

Publication number: CN110757251A
Application number: CN201910620730.4A
Authority: CN
Inventors: 朱小东
Original assignee: Nanjing Taiyu Cnc Equipment Manufacturing Co Ltd
Current assignee: Nanjing Taiyu Cnc Equipment Manufacturing Co Ltd
Priority date: 2019-07-10
Filing date: 2019-07-10
Publication date: 2020-02-07

Abstract

The invention provides a numerical control laser scanning device, which comprises a laser scanning device, a supporting body, a parallel moving table, a holding unit, a fixer, a reflector and a numerical control component, wherein the laser scanning device is arranged on the supporting body; the laser scanning device is arranged on the upper portion of the supporting body, the holding units are arranged on the upper surface of the peripheral edge of the parallel moving platform, the holding units surround the peripheral edge of the upper surface of the parallel moving platform, the object stage is formed in the center of the parallel moving platform and used for placing an object to be processed, a v-shaped groove is formed between the holding units and the object stage, a plurality of fixing devices are mounted on the upper surface of the holding units, a reflector is mounted on one side wall, close to the fixing devices, in the v-shaped groove, and the numerical control component is electrically connected with the laser scanning device. The processing object can be guaranteed to keep the correct size in the processing process, and meanwhile, the processed object is guaranteed to meet the product specification.

Description

Numerical control laser scanning equipment

Technical Field

The invention relates to scanning equipment, in particular to numerical control laser scanning equipment.

Background

A numerically controlled lathe is a machine tool controlled by a computer numerical value. In general, a numerically controlled lathe is used for machining a component or a part called a "workpiece", and includes a parallel-moving table to which the workpiece is fixed, and the parallel-moving table is movable in parallel along an X axis and a Y axis. Generally, a substantially horizontal plane is defined by the X-axis and the Y-axis, but it can be moved in parallel in other directions. The numerically controlled lathe is further provided with at least one parallel-motion table fixed independently of the workpiece. The lathe can be moved in parallel along the X-axis, Y-axis, and vertical axis, in conjunction with the parallel-moving stage, or independently from the parallel-moving stage.

In order to machine a workpiece by a numerically controlled lathe, it is necessary to perform detailed side measurement of the workpiece and input the measured side measurement to the numerically controlled lathe. In the conventional art, the measurement is performed using a mechanical gauge. In the case where the parallel translation table of the numerically controlled lathe does not include a mounting system in which the workpiece is disposed substantially at a right angle on the parallel translation table, it is preferable to consider data at the time of mounting the workpiece with respect to the coordinate system of the numerically controlled lathe in order to precisely machine the workpiece. In order to manually consider data of a workpiece mounted on a parallel translation table, it takes much time to input data to a measurement and numerically controlled lathe. Current methods of performing side measurements of a workpiece are slow, have a small number of data points, and are not easily embedded in a numerically controlled lathe.

Disclosure of Invention

The invention provides a numerical control laser scanning device, which comprises a laser scanning device, a supporting body, a parallel moving table, a holding unit, a fixer, a reflector and a numerical control component, wherein the laser scanning device is arranged on the supporting body; the laser scanning device is arranged on the upper portion of the supporting body, the holding units are arranged on the upper surface of the peripheral edge of the parallel moving platform, the holding units surround the peripheral edge of the upper surface of the parallel moving platform, the object stage is formed in the center of the parallel moving platform and used for placing an object to be processed, a v-shaped groove is formed between the holding units and the object stage, a plurality of fixing devices are mounted on the upper surface of the holding units, a reflector is mounted on one side wall, close to the fixing devices, in the v-shaped groove, and the numerical control component is electrically connected with the laser scanning device.

Preferably, the laser scanning device includes a detector located at a lower end of the laser scanning device and facing a center of the stage of the parallel moving stage.

Further, the position of the laser scanning device is opposite to the upper side of the reflector.

Preferably, the numerically controlled component comprises a processor, having a computer readable medium, read/write memory, a user interface, a network interface, and an auxiliary I/O control system; the parts are all electrically connected.

Further, the auxiliary I/O control system comprises an analog input/output module and a digital input/output module; the modules are electrically connected with each other.

Further, the processor and/or the auxiliary I/O further include one or more of a PWM generation module, an interrupt controller, a digital signal processing module, or a counter; the parts are all electrically connected.

In order to ensure the correct machining of the workpiece, the dimensions of the workpiece need to be measured correctly. In particular, these measured dimensions represent the assurance that the unprocessed work piece meets product specifications and is machined in the correct position. While it is desirable to use laser light as much as possible to optically measure dimensions, acoustic or other measurement methods may also be used in accordance with the principles of the present invention.

Preferably, the object to be processed is surrounded by a reflector such as a reflector or a prism fixed to the parallel-moving stage. The reflector disposed on the output side of the laser scanning device may be incorporated into the laser scanning device, and the laser scanning device may be moved to a predetermined spatial coordinate on the parallel-moving stage. The light beam of the laser scanning device is directed toward the parallel-moving stage at a predetermined angle with respect to a plane defined by the parallel-moving stage.

Preferably, the light rays are oriented along a vertical axis perpendicular to the plane, wherein the predetermined angle is 90 ° with respect to the plane. The light beam is directed toward a reflector disposed along the edge of the workpiece, and is reflected by the edge of the workpiece by the reflector, reflected by the edge of the workpiece, and returned to a detector in the laser scanning device via the reflector.

Preferably, the light may also be reflected by a reflector connected to the output side of the laser scanning device that directs the light toward the edge of the work piece. The laser scanning device measures a distance from the laser scanning device to an edge of the workpiece. The distance is correlated with a predetermined spatial coordinate of the laser scanning device, and XY coordinates of a point on the edge of the workpiece are calculated. The laser scanning device is then moved parallel to an axis parallel to the reflector and further data points are collected. Each reflector is scanned in the same manner, and as a result, the side of the workpiece is measured. According to the present invention, all scans can be performed in only a few seconds, and 1000 or more data points are generated, and as a result, both the side measurement speed and the accuracy of the workpiece are improved as compared with the conventional technique.

Preferably, the numerically controlled lathe comprises a processor, a control system with a computer readable medium, read/write memory, a user interface, a network interface, other I/O and auxiliary I/O. The auxiliary I/O includes analog input output and digital input output. The processor and/or auxiliary I/O may also include PWM generation modules, interrupt controllers, digital signal processing modules, counters, and other I/O known in the art of embedded system design. The numerically controlled lathe control software includes one or more programs that integrate the above-described measurement system into the numerically controlled lathe.

Has the advantages that: the invention can ensure that the processed object keeps the correct size in the processing process and simultaneously ensure that the processed object meets the product specification.

Drawings

Fig. 1 is a schematic structural diagram of a numerical control laser scanning device.

Detailed Description

FIG. 1 illustrates a system for measuring a side of a work piece according to some embodiments. The system has a support body 2, a laser scanning device 1, a parallel-moving stage 3, a holder 5 and a reflector 6. A reflector 6 is fixed between the holder 5 and the support body 1. The work piece typically includes a plurality of reflective ends. The object to be processed is mounted on the parallel-moving table 3, and thus can move in the XY direction on a plane set on the upper surface of the parallel-moving table 3. The laser scanning device 1 is provided with laser light emitted from the laser scanning device 1 in a direction substantially perpendicular to the plane of the workpiece and the parallel-moving table 3. The laser light is directed to one reflector 6 of the plurality of reflectors 6. The plurality of reflectors 6 are arranged around the workpiece, and the laser light is reflected by the reflectors toward the reflection end of the workpiece, and the reflection end is reflected. The reflector is then reflected by the reflector 6. The laser scanning apparatus 1 measures a distance from the laser scanning apparatus 1 to the workpiece. The XY coordinates of the reflection point of the laser beam at the reflection end are determined using the distance and the spatial coordinates of the laser scanning device. The coordinates store data. Then, the laser scanning device 1 acquires and saves other measurement values after moving in parallel to one reflector 6 of the plurality of reflectors 6. For example, the laser scanner 1 may be mounted on the parallel-moving stage 3 to fix the workpiece at a certain position.

The laser scanner 1 is arranged at a predetermined Z-coordinate on the parallel-moving stage 3 by the numerical control unit 7. The prescribed Z coordinate is kept constant during the measurement of the side of the workpiece. The laser scanning device 1 emits laser light reflected by the reflector 6 onto the work. The laser light is reflected by the reflection end of the workpiece to become reflected light, and then reflected by the reflector 6 to the detector. The laser scanning device 1 calculates the distance from the laser scanning device 1 to the detector via the workpiece by calculating the "travel time" of the laser light and the reflected light as described above. The laser travel distance in one direction from the laser scanner 1 to the reflection end of the workpiece is obtained by the laser reciprocating path. The distance from the reflection point on the reflector 6 to the work is obtained by subtracting the travel distance in one direction of the laser light in the Z direction from the entire one-way travel distance of the laser light. The XY coordinates of the reflection point of the reflected light on the work are obtained by adding or subtracting the distance from the reflection point of the reflector 6 to the work to or from the coordinates of the reflection point of the reflector 6. By similarly scanning each reflection end of the workpiece, all the coordinate sets of the workpiece are generated.

In certain embodiments, a single reflector 6 is mechanically connected to the laser scanning device 1 via the reflector 6. The reflector 6 is arranged at a predetermined fixed distance from the laser scanning device 1. The laser scanner 1 is mounted on the parallel-moving stage 3, and a fixed stage is provided instead of the parallel-moving stage 3. Then, the laser scanning device is rotated clockwise by 90 degrees about the vertical axis, and the next reflective end of the workpiece is also scanned.

In some embodiments, the reflector 6 reflects the laser light toward the reflection end of the workpiece, and then the reflection end reflects the laser light in the return direction to generate reflected light, which is detected by a detector provided in the laser scanning device 1. The laser light is emitted downward from the laser scanning device 1. The first and second reflected lights are reflected in parallel to the incident laser light and the reflected light, respectively, and detected and measured by a detector. The third and fourth lasers reach the reflective end in a curved portion of the reflective end. Since the laser light hits the workpiece at the reflection end of the workpiece orthogonal to the laser light, the laser light is reflected to the detector as reflected light.

In actual operation, the workpiece is placed on a platen and fixed to the platen. The laser scanning device measures the coordinates of the reflection end over the entire peripheral portion of the workpiece, and stores the coordinates. The incremental change between laser measurements associated with the reflective end can be varied to account for the balance between the speed of the scan and the number of data points collected; the measured coordinates are stored and the signal is transmitted to the numerical control part 7 and the machining is performed by the numerical control part 7.

Claims

1. A numerically controlled laser scanning apparatus, characterized by: comprises a laser scanning device, a supporting body, a parallel moving table, a holding unit, a fixer, a reflector and a numerical control component; the laser scanning device is arranged on the upper portion of the supporting body, the holding units are arranged on the upper surface of the peripheral edge of the parallel moving platform, the holding units surround the peripheral edge of the upper surface of the parallel moving platform, the object stage is formed in the center of the parallel moving platform and used for placing an object to be processed, a v-shaped groove is formed between the holding units and the object stage, a plurality of fixing devices are mounted on the upper surface of the holding units, a reflector is mounted on one side wall, close to the fixing devices, in the v-shaped groove, and the numerical control component is electrically connected with the laser scanning device.

2. The digitally controlled laser scanning device of claim 1, wherein: the laser scanning device comprises a detector which is positioned at the lower end of the laser scanning device and faces to the center of the object of the parallel moving platform.

3. The digitally controlled laser scanning device of claim 1 or claim 2, wherein: the laser scanning device is positioned right above the reflector.

4. The digitally controlled laser scanning device of claim 1, wherein: the numerical control component includes a processor, having a computer readable medium, read/write memory, a user interface, a network interface, and an auxiliary I/O control system; the parts are all electrically connected.

5. The digitally controlled laser scanning device of claim 4, wherein: the auxiliary I/O control system comprises an analog input/output module and a digital input/output module; the modules are electrically connected with each other.

6. The digitally controlled laser scanning device of claim 4, wherein: the processor and/or the auxiliary I/O also comprise one or more of a PWM generating module, an interrupt controller, a digital signal processing module or a counter; the parts are all electrically connected.