CN210826360U - Variable facula laser coating device - Google Patents
Variable facula laser coating device Download PDFInfo
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- CN210826360U CN210826360U CN201921499365.8U CN201921499365U CN210826360U CN 210826360 U CN210826360 U CN 210826360U CN 201921499365 U CN201921499365 U CN 201921499365U CN 210826360 U CN210826360 U CN 210826360U
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Abstract
The embodiment of the utility model discloses variable facula laser coating device, the device includes closed shell, laser entrance port, exit port and transmission system, laser entrance port and exit port set up on the closed shell, set up first reflector and second reflector in the closed shell, the laser that jets into from the laser entrance port jets into to the second reflector through first reflector reflection, through the reflection of second reflector, jets out from the exit port; the transmission system is used for controlling the movement of the second reflective mirror. The utility model adopts an off-axis double-reverse structure, has simple structure, high energy utilization rate and stronger environmental adaptability, and is realized by adopting the reflection of light; the position of the second reflector is adjustable, so that light spots with different sizes can be obtained, and different application requirements are met. And the reflective structure reflects the light path twice to form a Z shape, so that the total length of the system is effectively reduced, and the space and the design cost are saved.
Description
Technical Field
The utility model belongs to the technical field of laser cladding manufacturing technique and specifically relates to a variable facula laser coating device.
Background
Laser coating is a special metal surface strengthening process, and the principle is that certain powder metal materials are coated on the surface of a substrate by applying controllable heat from laser to achieve the surface strengthening effect. The laser coating process requires a small heat input and therefore a small heat affected zone, and only a small area of the base material melts with the coating material during the coating process to produce a metallurgical bonding effect. This small amount of heat energy input prevents the product from deforming while having minimal impact on the properties of the base material.
In the optical design of the existing laser coating equipment, light beams are refracted by reflectors around the refraction value of a beam splitter prism and then are refracted and focused on a working surface; or the light is reflected by a reflector and focused on the working surface by a shaping lens, the structure is complex, and the adjustment is difficult during installation. And the accuracy of the light spot is low, and the size of the light spot is fixed and unchangeable.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides an in provide a variable facula laser coating device to the optical structure design of solving current laser coating equipment is complicated, and the facula precision that obtains is low. The spot size is fixed.
In order to solve the technical problem, the embodiment of the utility model discloses following technical scheme:
the utility model discloses a first aspect provides a variable facula laser coating device, the device includes closed shell, laser entrance port, exit port and transmission system, laser entrance port and exit port set up on the closed shell, set up first reflector and second reflector in the closed shell, the laser that jets into from the laser entrance port jets into to the second reflector through first reflector reflection, through the reflection of second reflector, jets out from the exit port; the transmission system is used for controlling the movement of the second reflective mirror.
Further, the first reflective mirror and the second reflective mirror form an off-axis double-reflection structure.
Furthermore, the first reflecting mirror is a high-order aspheric concave reflecting mirror, and the second reflecting mirror is a high-order aspheric plane reflecting mirror; the first reflective mirror and the second reflective mirror are both copper mirrors.
Further, the transmission system comprises a linear motion module and a rotation module, and the linear motion module and the rotation module respectively control the linear motion and the rotation of the second reflective mirror, and the linear motion is along the direction of the optical axis.
Further, the rotating module comprises a first motor, a first meshing gear, a second meshing gear and a rotating shaft; the first motor rotates to sequentially drive the first meshing gear, the second meshing gear and the rotating shaft to rotate, and the rotating shaft is connected with the second reflector.
Further, the linear motion module comprises a second motor, a first synchronous pulley, a synchronous belt, a second synchronous pulley and a linear module; the second motor rotates, drives first synchronous pulley, hold-in range and second synchronous pulley in proper order and rotates, and second synchronous pulley drives the motion of sharp module, sharp module fixed connection base, the fixed support that sets up on the base, the pivot is passed through the support and is supported.
The effects provided in the contents of the present invention are only the effects of the embodiments, not all the effects of the present invention, and one of the above technical solutions has the following advantages or advantageous effects:
1. in the optical design, an off-axis double-reflection structure is adopted, the structure is simple, the reflection of light is adopted, the energy utilization rate is high, and the environment adaptability is strong; the position of the second reflector is adjustable, so that light spots with different sizes can be obtained, and different application requirements are met. And the reflective structure reflects the light path twice to form a Z shape, so that the total length of the system is effectively reduced, and the space and the design cost are saved.
2. The two reflectors are high-order aspheric mirrors, so that the number of lenses is reduced, the structure is further simplified, and energy loss is reduced. The two reflectors are copper mirrors, have high thermal conductivity and high reflectivity, and further reduce the optical energy loss. During design, the influence of the aspheric coefficient on the imaging quality of the system can be judged through the absolute value of the aspheric coefficient, and an independent distance adjusting system, namely a rotating system, is adopted, so that the device has strong environmental adaptability. And tolerance analysis and optimization are carried out on parameters of the optical system by using Zemax software, so that the emergent spot size is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of the device of the present invention;
FIG. 2 is a schematic structural diagram (I) of the transmission system of the present invention;
fig. 3 is a schematic structural diagram (ii) of the transmission system of the present invention;
FIG. 4 is a schematic flow chart of the device design method of the present invention;
fig. 5 is a schematic diagram of the optical path of the optical system of the present invention;
fig. 6 is a schematic light path diagram of the off-axis double reflection structure of the present invention;
in the figure, 1 is a closed shell, 2 is a laser incident port, 3 is an emergent port, 4 is a first reflector, 5 is a second reflector, 61 is a first motor, 62 is a first meshing gear, 63 is a second meshing gear, 64 is a support, 65 is a rotating shaft, 71 is a second motor, 72 is a first synchronous pulley, 73 is a synchronous belt, 74 is a second synchronous pulley, 75 is a linear module, 76 is a base, and 8 is a moving gap.
Detailed Description
In order to clearly illustrate the technical features of the present invention, the present invention is explained in detail by the following embodiments in combination with the accompanying drawings. The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. It should be noted that the components illustrated in the figures are not necessarily drawn to scale. Descriptions of well-known components and processing techniques and processes are omitted so as to not unnecessarily limit the invention.
As shown in fig. 1, the variable spot laser coating apparatus of the present invention includes a sealed casing 1, a laser entrance port 2, an exit port 3 and a transmission system, the laser entrance port 2 and the exit port 3 are disposed on the sealed casing 1, a first reflective mirror 4 and a second reflective mirror 5 are disposed in the sealed casing 1, laser emitted from the laser entrance port 2 is reflected to the second reflective mirror 5 by the first reflective mirror 4, reflected by the second reflective mirror 5, and emitted from the exit port 3; the transmission system is used for controlling the movement of the second reflective mirror. In this embodiment, 1064nm short-wave infrared intense laser is used as a laser light source.
The first reflector 4 is fixedly arranged on the back plate of the closed shell 1, the first reflector 1 and the second reflector 5 form an off-axis double-reverse structure, and light rays cannot be shielded in the reflection process. The closed housing 1 is provided with a displacement recess 8 for the connection of the second mirror to the drive train. The second reflective mirror 5 is driven by the transmission system to move linearly and/or rotate along the optical axis direction.
The first reflective mirror 4 is a high-order aspheric concave reflective mirror, and when light is focused, the energy of the light beam is rearranged, so that the original Gaussian distribution is changed into flat-top distribution when the light beam is transmitted to the second reflective mirror 5. The second reflecting mirror 5 is a high-order aspheric plane reflecting mirror, and corrects the shaped light beam to make the light beam have good transmission performance. The first reflective mirror 4 and the second reflective mirror 5 are oxygen-free copper mirrors. An off-axis double-reflection structure is adopted, two copper aspheric reflectors are used for reflecting laser twice, and finally the laser is focused on a working surface. The aspheric surface brings a large number of optimizable coefficients, simulation and automatic optimization processing are carried out through Zemax software, controllability of the size of the light spot is guaranteed, and therefore accuracy of the light spot is improved.
The transmission system comprises a linear motion module and a rotation module, and the linear motion module and the rotation module respectively control the linear motion and the rotation of the second reflective mirror, wherein the linear motion is along the direction of the optical axis.
As shown in fig. 2 and 3, the rotating module includes a first motor 61, a first meshing gear 62, a second meshing gear 63, and a rotating shaft 65; the first motor 61 rotates to sequentially drive the first meshing gear 62, the second meshing gear 63 and the rotating shaft 65 to rotate, and the rotating shaft 65 is connected with the second reflective mirror 5, so that the second reflective mirror is driven to rotate through the rotating module.
The linear motion module comprises a second motor 71, a first synchronous pulley 72, a synchronous belt 73, a second synchronous pulley 74 and a linear module 75; the second motor 71 rotates to sequentially drive the first synchronous pulley 72, the synchronous belt 73 and the second synchronous pulley 74 to rotate, the second synchronous pulley 74 drives the linear module 75 to move, the linear module 75 is fixedly connected with the base 76, the support 64 is fixedly arranged on the base 76, and the rotating shaft 65 is supported by the support 64 so as to drive the second reflective mirror 5 to perform linear motion.
As shown in fig. 4, the design method of the laser coating apparatus of the present invention includes:
step 3, setting a coordinate section, increasing a defocusing amount parameter, avoiding mutual shielding of the first reflector and the second reflector, and performing parameter optimization again;
and 4, calculating the movement distance of the second reflecting mirror according to the required light spot size to form the corresponding relation between the position of the second reflecting mirror and the light spot size.
In step 1, a coaxial system is first set up before the off-axis double-transreflective structure is set up. As shown in fig. 5, the point O is a laser incident point, S1 is a first reflective mirror, and S2 is a second reflective mirror. The mirror being of rotationally symmetrical construction, but for subsequent separationThe focus operation (too much shielding between the whole mirrors is not good for defocusing, so only half of the mirror is used, and the part of the first mirror S1 below the secondary reflection light is also removed), the design is completed only by the upper half of the mirror, and the schematic diagram also only shows the upper half of the optical axis. The spot diameter h2 was set to 3mm, and the incident laser diameter h1 was set to 0.6 mm. According to experience and engineering requirements, let l2 be 650 mm. By the formula of magnification
L1 can be obtained.
According to the Gaussian formula
(in a reflective system n' ═ n, then
) The radius of curvature R of the first reflective mirror S1 can be obtained. And the second reflecting mirror S2 only acts to change the optical path, so the curvature radius is infinite and is plane, i.e. the light should be collected at point B originally, and the light is collected at point C due to the action of the second reflecting mirror S2. And for compactness and symmetry of the whole system, the placement of S2 at point a is chosen to be 200mm from S1.
On the premise of determining the size of the light spot, the curvature radius of the two reflectors and the distance between the object, the image and the reflectors are obtained.
In order to eliminate spherical aberration and coma aberration, the two reflectors are provided with aspheric coefficients k ═ e2. The primary spherical aberration and coma coefficients are as follows:
line S'1＝S'2When k is 0, the aspheric coefficient k is e2α are each S'1,S'2The magnification of (3). All required for coaxial systemThe initial amounts are obtained.
In step 2, the resulting initial quantities are brought in Zemax software and optimized. Zemax was optimized using the following type function:
where c is the curvature of the aspheric apex (the curvature is the reciprocal of the radius of curvature), k is the coefficient obtained above, r is the aspheric half diameter, and a4、a6、a8、a10And the like are aspheric even order high order term coefficients.
In Zemax, the curvature radius R, the coefficients k and a4,a6,a8,a10Setting equal-height coefficient and distance between the incident surface and the first reflector as variables, setting the distance between the two lenses and the distance between the second reflector and the image surface as fixed values, setting REAY, setting the height of light on the image surface by using REAX operand, and optimizing by adopting a surface function, thus controlling the size of the light spot on the image surface. The data required in the optimization process are shown in tables one and two below.
Table-optical structure parameter table
| Surface numbering | S1 | S2 |
| K | -10.767338 | -1.622E+036 |
| A4 | -6.896E-008 | -4.611E-008 |
| A6 | 3.3495E-012 | 1.2398E-011 |
| A8 | -1.901E-016 | -3.142E-015 |
| A10 | 8.8855E-021 | 2.5257E-020 |
Table two is high-order aspheric surface coefficient table
In step 3, a coordinate section is set, the defocus amount parameter is increased, and the defocus amount is continuously increased according to experience, so that the two reflectors are not shielded, and the off-axis double-reflection structure shown in fig. 6 is obtained by optimizing the two reflectors again.
In step S4, according to the required spot size, the incident light angle is unchanged, so the emergent light L2 is parallel to the original light L1, and the imaging point at point C is obviously higher, i.e., h 2'. When l1, R, k, and h1 are unchanged, the value of h 2' is set to obtain l 2. The shortened distance compared to the previous l2, i.e. the distance the point E (second mirror) advances relative to a. Thereby forming the corresponding relation between the position of the second reflector and the size of the light spot. And once the corresponding relation is calculated, the Zemax is utilized to carry out optimization, so that the obtained spot size is more accurate. Table three is down according to the utility model discloses a device, the parameter that the different spot size that actually obtains corresponds, the distance between two reflectors is represented to THIC in table three, and the unit is the millimeter, and PRAM represents the inclination of second reflector, and the spot size that following three kinds of structures correspond is 6 millimeters, 4 millimeters and 3 millimeters respectively.
| Structure of the | Structure | 1 | |
Structure 3 |
| THIC | -200 | -190 | -180 | |
| PRAM | 0 | 0.46 | 0.92 |
Table three configuration parameters
The above description is only a preferred embodiment of the present invention, and it will be apparent to those skilled in the art that a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations are also considered as the protection scope of the present invention.
Claims (6)
1. A variable-spot laser coating device is characterized by comprising a closed shell, a laser incident port, an exit port and a transmission system, wherein the laser incident port and the exit port are arranged on the closed shell; the transmission system is used for controlling the movement of the second reflective mirror.
2. The variable spot laser coating apparatus of claim 1 wherein the first mirror and the second mirror form an off-axis double mirror configuration.
3. The variable spot laser coating apparatus of claim 1 wherein the first mirror is a high order aspheric concave mirror and the second mirror is a high order aspheric planar mirror; the first reflective mirror and the second reflective mirror are both copper mirrors.
4. The variable spot laser coating apparatus of claim 1 wherein the transmission system comprises a linear motion module and a rotation module for controlling linear motion and rotation of the second mirror, respectively, the linear motion being along the optical axis.
5. The variable spot laser coating apparatus according to claim 4, wherein the rotation module includes a first motor, a first meshing gear, a second meshing gear, and a rotation shaft; the first motor rotates to sequentially drive the first meshing gear, the second meshing gear and the rotating shaft to rotate, and the rotating shaft is connected with the second reflector.
6. The variable spot laser coating apparatus according to claim 5, wherein the linear motion module comprises a second motor, a first synchronous pulley, a synchronous belt, a second synchronous pulley, and a linear module; the second motor rotates, drives first synchronous pulley, hold-in range and second synchronous pulley in proper order and rotates, and second synchronous pulley drives the motion of sharp module, sharp module fixed connection base, the fixed support that sets up on the base, the pivot is passed through the support and is supported.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921499365.8U CN210826360U (en) | 2019-09-10 | 2019-09-10 | Variable facula laser coating device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921499365.8U CN210826360U (en) | 2019-09-10 | 2019-09-10 | Variable facula laser coating device |
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| Publication Number | Publication Date |
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| CN210826360U true CN210826360U (en) | 2020-06-23 |
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| CN201921499365.8U Active CN210826360U (en) | 2019-09-10 | 2019-09-10 | Variable facula laser coating device |
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Effective date of registration: 20220330 Address after: 250104 Room 302, building 3, No. 818, Chunbo Road, East District, high tech Zone, Jinan City, Shandong Province Patentee after: Shandong Shanke Meirui Photoelectric Technology Co.,Ltd. Address before: 272000 block B, building A3, industry university research base, high tech Zone, No.9 Haichuan Road, Jining City, Shandong Province Patentee before: LASER INSTITUTE,SHANDONG ACADEMY OF SCIENCES |
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