CN-115673563-B - Universal device for creating a predetermined breaking line in a vehicle fitting

Abstract

The invention relates to a universal device for creating a predetermined breaking line in a vehicle assembly, comprising a laser beam generator (1), a laser scanner (2), linear or matrix-shaped first sensor means (3.1-3. N) of a first individual sensor (3.1) having the same first sensitivity, and at least one linear or matrix-shaped second sensor means (4) of a second individual sensor (4.1-4. N) which is identical, the second sensor means (4) being offset from the first sensor means (3) of the first individual sensor (3.1-3. N), the second individual sensor (4.1-4. N) having the same second sensitivity, which is different from the first sensitivity.

Inventors

• WALTER LUTZ
• Andreas Bode Mosig

Assignees

• 业纳自动化有限公司

Dates

Publication Date

20260505

Application Date

20220704

Priority Date

20210730

Claims (7)

1. 1. A generic device for creating a predetermined breaking line in a vehicle assembly, comprising a laser beam generator (1), a laser scanner (2) and a first sensor arrangement (3) in the form of a line or a matrix, the first sensor arrangement (3) having first individual sensors (3.1-3. N) of the same first sensitivity and the same opening angle (a), wherein the first sensor arrangement (3) is arranged in a scanning area of the laser scanner (2) and immediately adjacent first individual sensors (3.1-3. N) have an equal distance and overlapping field of view (a 3.1-4.n ) from each other, It is characterized in that the method comprises the steps of, There is at least one linear or matrix-like second sensor device (4) of the same second individual sensor (4.1-4. N), the second sensor device (4) being misplaced relative to the first sensor device (3) in the scanning area of the laser scanner (2), and the second individual sensor (4.1-4. N) having the same second sensitivity, which is different from the first sensitivity.
2. 2. The universal device for creating a predetermined breaking line in a vehicle assembly according to claim 1, characterized in that the first (3.1-3. N) and second (4.1-4. N) single sensors have overlapping fields of view (a 3.1-4.n ) in pairs.
3. 3. The universal device for creating a predetermined breaking line in a vehicle assembly according to claim 1 or 2, characterized in that the different sensitivities of the first (3.1-3. N) and second (4.1-4. N) single sensors relate to different dynamic ranges.
4. 4. The universal device for creating a predetermined breaking line in a vehicle fitting according to claim 1 or 2, characterized in that the different sensitivities of the first (3.1-3. N) and second (4.1-4. N) single sensors relate to different spectral ranges.
5. 5. A generic device for creating a predetermined breaking line in a vehicle fitting according to claim 3, characterized in that the different sensitivities also relate to different resolutions.
6. 6. A generic device for creating a predetermined breaking line in a vehicle fitting according to claim 3, characterized in that there is exactly one first sensor means (3) and exactly one second sensor means (4).
7. 7. Universal device for creating a predetermined breaking line in a vehicle fitting according to claim 2, characterized in that there is a first sensor means (3), a second sensor means (4) and a third sensor means (5).

Description

Universal device for creating a predetermined breaking line in a vehicle fitting Technical Field The invention relates to a device for ablating material along a predetermined breaking line to a predetermined residual wall thickness by means of a processing laser beam scanned over a vehicle assembly. Background It has long been known to create predetermined breaking lines in the equipment parts of a vehicle by means of a laser, for example for airbag openings in the instrument panel, door panels or steering wheel hubs or as breaks in the protruding parts of the passenger compartment, etc., for example cup holders. Such a predetermined breaking line is both to be broken reliably when necessary and to meet aesthetic requirements for the appearance of the fitting, i.e. the predetermined breaking line should not be visible to the naked eye of the vehicle occupant, so that the material is peeled off along the predetermined breaking line surrounding the predetermined breaking line by means of a sensor control during its creation. Also in other applications, such as in the packaging industry, it is known to introduce predetermined breaking lines in containers or the like as separation aid means. In order to create a predetermined breaking line by stripping the material by means of a laser, incompletely severed slits or holes or micro-holes are introduced into the associated workpiece, which penetrate the workpiece with only very small holes. By means of sensor monitoring, reproducible residual predetermined residual wall thickness or microholes not visible to the naked eye can be produced along the predetermined breaking line, i.e. when radiant energy transmitting the residual wall or microholes is detected, exceeding a preset threshold value is used as a control variable. For this purpose, at least one individual sensor is arranged on the side of the workpiece opposite the laser (visible side), which sensor detects the transmitted portion of the machining laser radiation during machining if the workpiece has only a certain residual wall thickness or microholes (hereinafter only residual wall thickness) within a predetermined fracture line at the respective machining location. The relative movement required to create the predetermined breaking line by the energy radiation can be generated either by the laser beam as a tool or by the workpiece (here the assembly). When the laser beam is moved, either the individual sensors are moved synchronously or the individual sensors are arranged along a predetermined breaking line such that every possible processing point along the predetermined breaking line is located in the field of view of at least one individual sensor. In the case of synchronous actuation of the individual sensors, the same signal formed therefrom is a measure of the same residual wall thickness. In the arrangement of the individual sensors, they are matched to one another in terms of sensitivity, so that, under identical transmitted radiation, the individual signals formed by the received individual sensors produce identical resulting signals, which are a measure of the identical residual wall thickness. In this case, sensitivity is understood as the dynamic range and resolution within the dynamic range as well as the spectral range and spectral resolution of the corresponding individual sensor. The single-body sensors have different sensitivities, in particular when they transmit signals in different spectral ranges and/or different dynamic ranges. Whether the predetermined breaking line is formed by a circular hole in the broad sense or by an elongated slit leaving a short or long bridge therebetween and having a larger or smaller (even zero) residual wall thickness, the design depends on the material properties of the fitting, i.e. creating a predetermined breaking line that can be opened with a predetermined defined tearing force. Depending on the material selection, this may apply to a variety of different residual wall thicknesses. In the sense of the present specification "transmission radiation" is understood to mean processing laser radiation transmitted through the material at the processing site as well as radiation occurring at the processing site by interaction of the processing laser radiation with the material. The same transmitted radiation is radiation having the same spectral components and the same intensity. The devices known from the prior art differ in sensor design in the presence of individual sensors, a linear arrangement of individual sensors or an individual sensor matrix. The sensitivity of all the individual sensors is the same, specified in the device design according to the material properties of the fitting. Adaptation of existing devices to the transmitted radiation expected to impinge can be achieved by electronic variation of the sensitivity of the individual sensors or by filters connected upstream, as appropriate. As mentioned above, sensitivity in the sense of the p