Elliptical cutting head and laser cutting device

Abstract

The utility model relates to laser cutting, and provides an ellipse cutting head which comprises a shell and a rotating assembly arranged on the shell, an optical assembly is arranged on the rotating assembly, an objective lens is arranged at the emergent end of the shell, the objective lens is located on an emergent light path of the optical assembly, and the optical assembly is arranged on the shell. The optical assembly comprises an elliptical shaping lens, a conical lens and a convex lens which are sequentially arranged in the optical axis direction and are coaxial with a rotating shaft of the rotating assembly, and the objective lens is located on an emergent light path of the convex lens; the utility model further provides a laser cutting device which comprises the cutting head. According to the cutting head provided by the utility model, the uniformity and ovality of emergent light of the objective lens can be better, the cutting processing quality is ensured, the cutting head is particularly suitable for processing high-refraction special glass, and the cutting head and other cutting heads can be compatible with the same laser.

Description

Technical Field

[0001] The utility model relates to laser cutting, in particular to an elliptical cutting head and a laser cutting device. Background Art

[0002] Currently, laser processing of special glass places high demands on lasers. For example, when laser cutting high-refractive glass, WOP (Workshop of Photonics) uses conical lenses and requires narrow pulse width lasers. Not only is the processing quality difficult to guarantee, but the compatibility is also poor. Utility Model Content

[0003] The purpose of the utility model is to provide an elliptical cutting head and a laser cutting device, which can at least solve some of the defects in the prior art.

[0004] To achieve the above-mentioned purpose, the embodiment of the utility model provides the following technical solutions: an elliptical cutting head, comprising a shell and a rotating assembly mounted on the shell, an optical assembly mounted on the rotating assembly, an objective lens being arranged at the output end of the shell, the objective lens being located on the output light path of the optical assembly, the optical assembly comprising an elliptical shaping lens, a conical lens and a convex lens, the three being arranged in sequence along the optical axis direction and being coaxial with the rotation axis of the rotating assembly, the objective lens being located on the output light path of the convex lens.

[0005] Furthermore, it also includes a focusing monitoring camera, which is located on the reverse transmission light path of the objective lens.

[0006] Furthermore, a first reflector and a second reflector are disposed in the housing, the first reflector is located on the outgoing light path of the optical component, the second reflector is located on the reflected light path of the first reflector, and the objective lens is located on the reflected light path of the second reflector.

[0007] Further, the focusing monitoring camera is located on the transmission light path of the second reflecting mirror.

[0008] Furthermore, the optical path distance between the convex lens and the objective lens is 50-20 mm.

[0009] Furthermore, it also includes a light spot centroid monitoring camera. A spectroscope is arranged in the shell. The light spot centroid monitoring camera is located on the transmission light path of the spectroscope, and the optical component is located on the reflection light path of the spectroscope.

[0010] Furthermore, the rotating assembly includes a rotating motor having a light-transmitting hole, the optical assembly is mounted on the rotating motor, and the optical axis of the optical assembly passes through the light-transmitting hole.

[0011] Furthermore, a cross is provided at the incident interface of the incident end of the housing, and the center of the cross is located on the optical axis of the incident interface.

[0012] The embodiment of the utility model further provides a laser cutting device, comprising a laser and the above-mentioned elliptical cutting head, wherein the incident end of the shell is located on the output light path of the laser.

[0013] Furthermore, the elliptical cutting heads have at least two groups, and a beam expander is provided on the output light path of the laser, and the beam expander is connected to each elliptical cutting head through a beam splitting light path.

[0014] Compared with the prior art, the beneficial effects of the utility model are as follows: in the optical component of the cutting head, the elliptical shaping mirror, the conical lens and the convex lens are arranged in sequence along the light path direction, and the optical axes of the three are coaxial. The optical component is installed as a whole on the rotating component to ensure that the optical axis of the optical component is coaxial with the rotation axis of the rotating component, thereby making the uniformity and ellipticity of the output light of the objective lens better, especially for the processing of special glass with high refraction, no special restrictions are required for conditions such as pulse width, and it can be replaced with other cutting heads and has good compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of an elliptical cutting head provided in an embodiment of the utility model;

[0016] Figure 2 A schematic diagram of the structure of a laser cutting device provided in an embodiment of the utility model;

[0017] Figure 3 A schematic diagram of the optical path principle of an elliptical cutting head provided in an embodiment of the utility model;

[0018] Figure 4 A schematic diagram of detecting the eccentricity of the aconic lens of the elliptical cutting head provided in an embodiment of the utility model;

[0019] Figure 5 A schematic diagram of the structure in which the optical component of the elliptical cutting head provided in an embodiment of the utility model is installed on the rotating component;

[0020] Figure 6 A schematic diagram of debugging the optical component and the rotating component of the elliptical cutting head provided in the embodiment of the utility model;

[0021] Figure 7 A schematic diagram of a structure in which a cross is arranged at the incident interface of an elliptical cutting head provided in an embodiment of the utility model;

[0022] Figure 8 A schematic diagram of normal incidence debugging of the objective lens of the elliptical cutting head provided in an embodiment of the utility model;

[0023] Fig. 9 A schematic diagram of the light spot debugging within the focal depth of the elliptical cutting head provided in an embodiment of the utility model;

[0024] Fig.10 A schematic diagram of debugging the centroid position of the light spot of the elliptical cutting head provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1 The embodiment of the utility model provides an elliptical cutting head 1, comprising a housing 11, a rotating assembly 12 and an optical assembly 13. The housing 11 is the main body of the cutting head 1, and the rotating assembly 12 and the optical assembly 13 are both mounted on the housing 11; the optical assembly 13 is the main working component of the cutting head 1, and the laser beam processes the workpiece after passing through the optical assembly 13, such as cutting high-refractive glass, and the optical assembly 13 is located in the housing 11; the rotating assembly 12 is the power component of the cutting head 1, and a rotating motor 121 can be used, and the optical assembly 13 is mounted on the rotating motor 121, and the rotating motor 121 can control the optical assembly 13 to rotate around the rotation axis. In addition, the cutting head 1 also includes an objective lens 14, which is installed at the exit end of the shell 11 and is located on the exit light path of the optical component 13, that is, the laser beam incident on the cutting head 1 is emitted by the objective lens 14 after being acted on by the optical component 13; an exit interface is provided at the exit end of the shell 11, and the objective lens 14 can be detachably installed at the exit interface, and 10X, 20X, 50X, etc. can be installed on the shell 11 as needed.

[0027] See also Figure 1 as well as Figure 3, the optical component 13 is refined, which includes an elliptical shaping lens 131, a cone lens 132 and a convex lens 133, which are arranged in sequence along the optical path direction in the housing 11, that is, the laser beam incident on the cutting head 1 passes through the elliptical shaping lens 131, the cone lens 132 and the convex lens 133 in sequence, and the objective lens 14 is located on the exit optical path of the convex lens 133. The optical axes of the three lenses of the optical component 13 are coaxially arranged, and after the optical axes of the three lenses are debugged, the optical component 13 is installed on the rotating component 12 as a whole, and the optical axis of the debugged optical component 13 is coaxially arranged with the rotation axis of the rotating component 12. In this embodiment, the rotating component 12 includes a rotating platform 122, and the optical component 13 is installed on the rotating platform 122. The rotating motor 121 can drive the rotating platform 122 to rotate around its own axis, and then drive the optical component 13 to rotate synchronously. The rotating platform 122 has a light-transmitting hole, which is a cylindrical through hole. The rotation axis of the rotating platform 122 is the central axis of the light-transmitting hole. When the optical component 13 is mounted on the rotating platform 122, the optical axis of the optical component 13 is coaxial with the central axis of the light-transmitting hole. In this embodiment, by controlling the coaxial arrangement of the elliptical shaping mirror 131, the aconical lens 132, the convex lens 133, and the rotating platform 122, the eccentricity of the aconical lens 132 is ensured, so that the uniformity and ellipticity of the emitted light of the objective lens 14 are relatively good, especially for the processing of special glass with high refraction, no special restrictions are required for conditions such as pulse width, thereby forming very good compatibility with other cutting heads 1.

[0028] See also Figure 1 as well as Fig. 9In one embodiment, the cutting head 1 further includes a focusing monitoring camera 15, which is located on the reverse transmission light path of the objective lens 14. In this embodiment, the focusing monitoring camera 15 is added. After the installation and commissioning of the cutting head 1 is completed, the rotating motor 121 controls the optical component 13 to rotate one circle, and the uniformity of the intensity of the elliptical spot at different focal depths and different angles can be observed through the focusing monitoring camera 15. Specifically, the focusing monitoring camera 15 is arranged on one side of the output end of the shell 11, and a first reflector 111 and a second reflector 112 are arranged in the shell 11. The first reflector 111 and the second reflector 112 are arranged in parallel. The output light of the optical component 13 is incident on the first reflector 111 at 45 degrees, and the reflected light of the first reflector 111 is incident on the second reflector 112 at 45 degrees. The reflected light of the second reflector 112 is incident on the objective lens 14, and then forwardly transmitted to the product through the objective lens 14. With the product as the reflection surface, the reflected light is reversely transmitted to the second reflector 112 through the objective lens 14, and is transmitted to the focusing lens 151 through the second reflector 112, and finally an image is formed on the focusing monitoring camera 15. The focusing monitoring camera 15 acts as an imager to analyze the light spot within the depth of focus. The focusing monitoring camera 15 is detachably connected to the housing 11 and is insensitive to the XY direction. The focus monitoring camera 15 is mainly adjusted to move in the Z direction through a slide to obtain the focal spot. The so-called Z direction here refers to the transmission and reflection direction of the second reflector 112 (or the optical axis direction of the optical component 13). Adjust the product height to within the focal depth, adjust the position and angle of the focusing lens 151 so that it is imaged on the focusing monitoring camera 15, rotate the rotary motor 121 for one circle, observe the uniformity of the intensity of the elliptical spot at different focal depths and different angles, use the existing standard test as a benchmark, first test the energy distribution of the cutting head 1, and then compare the test results of the focusing monitoring camera 15 with the standard test results to ensure that the results are consistent.

[0029] In addition, the optical path distance between the optical component 13 and the objective lens 14, that is, the distance between the convex lens 133-the first reflector 111-the second reflector 112-the objective lens 14 and the distance between the two lenses in the traditional cutting head 1, in the preferred embodiment, the optical path distance is 50-200mm, and when the optical path distance is small, the optical component 13 is installed below the rotating platform 122 (the light emitting direction of the cutting head 1 is vertically downward) so that the distance between the convex lens 133 and the first reflector 111 is small; conversely, when the optical path distance is too large, the optical component 13 is installed above the rotating platform 122 so that the distance between the convex lens 133 and the first reflector 111 is large. At this time, there are certain requirements for the aperture of the light-transmitting hole, which is not less than 30mm.

[0030] In one embodiment, the cutting head 1 further includes a spot centroid monitoring camera 16, a beam splitter 113 is arranged in the housing 11, the spot centroid monitoring camera 16 is located on the transmission light path of the beam splitter 113, and the optical component 13 is located on the reflection light path of the beam splitter 113. In this embodiment, the spot centroid monitoring camera 16 is located at the exit end of the housing 11, and when the energy consistency of the spot is detected by the focusing monitoring camera 15 to meet the requirements, after the laser beam enters the housing 11, part of the laser beam enters the focusing lens 161 after passing through the beam splitter 113, and forms a focused spot on the spot centroid monitoring camera 16, thereby the spot centroid position can be obtained through the spot centroid monitoring camera 16, and it is used as a standard, and the angle of the laser beam incident on the housing 11 can be obtained. Usually, a cross 114 is provided at the incident interface at the incident end of the housing 11. The laser beam enters the housing 11 from the cross 114. The incident angle of the laser beam + the position of the cross 114 at the incident interface can determine the incident condition of the cutting head 1. The installation position of the focusing monitoring camera 15 can be fixed on the housing 11 with pins, or one camera can be used to debug multiple cutting heads 1. If the laser beam enters the housing 11 from the back of the cutting head 1, the focusing lens 161 and the focusing monitoring camera 15 are made into a detachable and shared integrated unit.

[0031] See also Figure 1 as well as Figure 2 The embodiment of the utility model also provides a laser cutting device, including a laser 2 and the above-mentioned cutting head 1, and the incident end of the shell 11 is located on the exit optical path of the laser 2. In this embodiment, the above-mentioned cutting head 1 is applied to the cutting device, and the laser 2 emits a laser beam through the incident interface of the shell 11 to enter the optical component 13, and cuts the product after passing through the first reflector 111, the second reflector 112 and the objective lens 14 in sequence, which can produce a good cutting effect on high-refractive glass. In addition, the cutting device provided by the utility model has good compatibility, and the cutting head 1 can be replaced according to actual processing needs. The cutting head 1 can be set in multiple groups, such as two groups. After the laser beam emitted by the laser 2 is expanded by the beam expander 3, the expanded laser beam is introduced into each cutting head 1 by using a split light path, such as using two groups of reflectors, and one of the reflectors can reflect and transmit, so that the expanded laser beam can be introduced into the corresponding cutting head 1.

[0032] The embodiment of the utility model also provides an installation method of an elliptical cutting head 1, which is mainly used for the installation and debugging of the above-mentioned cutting head 1, and specifically includes the following steps:

[0033] S1. Debugging the optical assembly 13 so that the elliptical shaping mirror 131, the conical lens 132, and the convex lens 133 are coaxial;

[0034] S2. The optical component 13 is mounted on the rotating component 12;

[0035] S3. Debug the rotating assembly 12 and the optical assembly 13 so that the rotation axis of the rotating assembly 12 is coaxial with the optical axis of the optical assembly 13;

[0036] S4. The debugged rotating assembly 12 and the optical assembly 13 are installed in the housing 11;

[0037] S5. Adjust the external light path so that the light is incident on the optical component 13;

[0038] S6. After debugging is completed, use the focusing monitoring camera 15 to observe, according to the rotation of one week, the state of the spot within the focal depth and the energy change, confirm the completion of the previous debugging steps;

[0039] S7. After the energy consistency requirement is met, a light spot centroid monitoring camera 16 is installed to record the position of the light spot centroid and use it as a standard.

[0040] See also Figure 1 as well as Figure 4 When debugging the coaxial setting of each lens of the optical assembly 13, an eccentric meter 4 is used (the traditional eccentric meter can only detect the focal length of a combination lens such as a plano-convex lens or a plano-concave lens, or the focal length of a lens combination with a clear focal length). By changing the imaging method of the traditional eccentric meter, another method of combining a conical lens 41 and a convex lens 42 with the same taper is used, so that a positive focus or defocused image can be presented in the camera 43; and by rotating the air-floating platform, the eccentricity of the conical lens 132 after assembly can be observed, and the position of the conical lens 132 can be adjusted in real time to meet the eccentricity requirements. The other two lenses of the optical assembly 13 (convex lens 133 and elliptical shaping lens 131) can be installed and debugged in the same way, namely, conical lens 132-convex lens 133-elliptical shaping lens 131, so as to ensure that the optical axis coaxiality of each lens of the optical assembly 13 after debugging is very high.

[0041] See also Figure 4-Figure 6 When debugging the rotating component 12 and the optical component 13: first, on the optical test platform, install the dimming fixture on the rotating motor 121, and roughly adjust the light path to make the test light path parallel to the normal incident light transmission hole; then install the optical component 13 on the rotating platform 122, and first use a mechanical meter to detect the concentricity and flatness of the installation; finally, use the beam quality analyzer 123 to detect the changes in the light spot after one rotation (the symmetry of the light spot distribution, the light spot position, the characteristic position, etc.). The optical detection results after installation and adjustment need to be compared with the test results on the eccentricity meter 4 when the optical component 13 is debugged.

[0042] See also Figure 1 , Figure 7 as well as Figure 8When the debugged rotating assembly 12 and the optical assembly 13 are integrally installed in the housing 11, the external optical path of the cutting head 1 (the laser beam emitted by the laser) is adjusted so that the laser beam is parallel and incident on the optical assembly 13, specifically, the normal-incidence elliptical shaping mirror 131. In the preferred embodiment, a cross 114 is provided at the incident interface of the housing 11, and the laser beam is incident on the center of the cross 114. The first reflector 111 and the second reflector 112 are adjusted in the housing 11 so that the outgoing light of the optical assembly 13 is parallel and incident on the objective lens 14. In the preferred embodiment, a dimming fixture is installed on the objective lens 14 so that the outgoing light is a uniform circular ring and is evenly divided by the cross 114. The first reflector 111 and the second reflector 112 are adjusted so that the horizontal line of the elliptical spot coincides with one side of the cross 114, thereby ensuring that the incident light of the objective lens 14 is normal incident.

[0043] See also Figure 1 as well as Fig. 9 In addition, for the focusing monitoring camera 15, the processed product is used as the reflection surface, the reflected light is attenuated through the objective lens 14 and the second reflection mirror 112, and the focusing lens 151 is imaged onto the focusing monitoring camera 15, and the light spot within the focal depth is analyzed. Specifically, the product height is adjusted to within the focal depth, and the position and angle of the focusing lens 151 are adjusted to image it onto the focusing monitoring camera 15; the rotating motor 121 is controlled to rotate one circle, and the uniformity of the intensity of the elliptical light spot at different focal depths and different angles is observed; based on the existing standard test, the energy distribution of the cutting head 1 is tested first, and then the test results of the focusing monitoring camera 15 are compared with the standard test results to ensure that the results are consistent.

[0044] See also Figure 1 as well as Fig.10 For the spot centroid monitoring camera 16, when the energy consistency of the spot is detected by the focusing monitoring camera 15 and meets the requirements, the laser beam is injected from the center of the cross 114 at the incident interface of the shell 11, and part of the laser beam enters the focusing lens 161 after passing through the beam splitter 113, and forms a focused spot on the spot centroid monitoring camera 16, thereby the spot centroid position can be obtained by the spot centroid monitoring camera 16, and it is used as a standard to obtain the angle of the laser beam incident on the shell 11, thereby the incident condition of the cutting head 1 can be determined by the incident angle of the laser beam + the position of the cross 114 of the incident interface.

[0045] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An elliptical cutting head, comprising a housing and a rotating assembly mounted on the housing, an optical assembly mounted on the rotating assembly, an objective lens disposed at the exit end of the housing, and the objective lens located on the exit light path of the optical assembly, It is characterized in that The optical component includes an elliptical shaping lens, a cone lens and a convex lens, which are arranged in sequence along the optical axis and are all coaxial with the rotation axis of the rotating component. The objective lens is located on the output light path of the convex lens.

2. The elliptical cutting head according to claim 1, It is characterized in that Also included is a focus monitoring camera, which is located on the reverse transmission light path of the objective lens.

3. The elliptical cutting head according to claim 2, It is characterized in that A first reflector and a second reflector are arranged in the housing. The first reflector is located on the outgoing light path of the optical component, the second reflector is located on the reflected light path of the first reflector, and the objective lens is located on the reflected light path of the second reflector.

4. The elliptical cutting head according to claim 3, It is characterized in that The focusing monitoring camera is located on the transmission light path of the second reflecting mirror.

5. The elliptical cutting head according to claim 3, It is characterized in that The optical path distance between the convex lens and the objective lens is 50-20 mm.

6. The elliptical cutting head according to claim 1, It is characterized in that It also includes a spot centroid monitoring camera. A spectroscope is arranged in the shell. The spot centroid monitoring camera is located on the transmission light path of the spectroscope, and the optical component is located on the reflection light path of the spectroscope.

7. The elliptical cutting head according to claim 1, It is characterized in that The rotating assembly comprises a rotating motor having a light-transmitting hole. The optical assembly is mounted on the rotating motor, and the optical axis of the optical assembly passes through the light-transmitting hole.

8. The elliptical cutting head according to claim 1, It is characterized in that A cross is arranged at the incident interface of the incident end of the shell, and the center of the cross is located on the optical axis of the incident interface.

9. A laser cutting device, comprising a laser, It is characterized in that It also includes the elliptical cutting head as described in any one of claims 1 to 8, wherein the incident end of the shell is located on the output light path of the laser.

10. The laser cutting device according to claim 9, It is characterized in that The elliptical cutting heads have at least two groups, and a beam expander is arranged on the output light path of the laser, and the beam expander is connected to each elliptical cutting head through a beam splitting light path.

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