CN113510386B

CN113510386B - Laser cutting device and method thereof

Info

Publication number: CN113510386B
Application number: CN202110698155.7A
Authority: CN
Inventors: 乐庸辉; 米云; 陶凯; 杨亚涛
Original assignee: Liuzhou Hongde Laser Technology Co ltd
Current assignee: Liuzhou Hongde Laser Technology Co ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2023-03-14
Anticipated expiration: 2041-06-23
Also published as: CN113510386A

Abstract

The invention discloses a laser cutting device and a method thereof, wherein the laser cutting device comprises a workbench and a workpiece positioning disk, the workbench is provided with an installation rack, a digital galvanometer is arranged at a position right above the workpiece positioning disk on the installation rack, and the installation rack is also provided with a laser source and a transmission component for transmitting a light beam emitted by the laser source to the digital galvanometer; the workbench is provided with a driving component for driving the workpiece positioning disc to move towards the X/Y/Z axis direction; the method comprises the following steps: placing a metal sheet to be processed on a positioning frame; starting the first linear motor, the second linear motor and the second driving piece; starting a laser source and simultaneously starting a heat dissipation fan; the beam expander receives the light beam and transmits the light beam to the wave plate through reflection of the reflector; the wave plate receives the light beam and transmits the light beam to the two-axis scanning galvanometer through reflection of the reflector; cutting a plurality of micropores by a two-axis scanning galvanometer; and stopping the laser source, and then starting the first linear motor, the second linear motor and the second driving piece. This application has the effect that improves machining efficiency, reduces the processing cost.

Description

Laser cutting device and method thereof

Technical Field

The invention relates to the field of laser cutting, in particular to a laser cutting device and a laser cutting method.

Background

With the continuous development of the society, when a plurality of metal sheets are subjected to micropore processing, the precision needs to be ensured to meet the energy environment-friendly requirement at the present stage, for example, in the pore-forming processing of an engine air nozzle, a plurality of micropores with millimeters as a unit are cut on one metal sheet, and therefore the forming of a nozzle hole has high consistency.

At present, a cutter cutting mode is usually adopted for pore-forming processing of a metal sheet, and micropores on the metal sheet are sequentially cut.

In view of the above related technologies, the inventor thinks that there exists a mode of cutting by using a tool, in which the tool is in contact with a machined part for many times, so that the tool is quickly worn, needs to be replaced frequently, and has high machining efficiency; and the precision requirement of the tool is high, so the required cost is high.

Disclosure of Invention

In order to improve the processing efficiency and reduce the processing cost, the application provides a laser cutting device and a method thereof.

In a first aspect, the present application provides a laser cutting device, which adopts the following technical solutions:

a laser cutting device comprises a workbench and a workpiece positioning disc, wherein the workpiece positioning disc is mounted on the workbench and used for positioning a workpiece to be machined, the workbench is provided with a mounting frame, a digital galvanometer is arranged on the mounting frame and positioned right above the workpiece positioning disc, and the mounting frame is further provided with a laser source and a transmission assembly used for transmitting a light beam emitted by the laser source to the digital galvanometer; the workbench is provided with a driving component for driving the workpiece positioning disc to move towards the X/Y/Z axis direction.

By adopting the technical scheme, during machining, the metal sheet to be machined is placed on the workpiece positioning disc to be positioned, and then the workpiece positioning disc is driven by the driving assembly to move to the position to be machined; the laser source is started, the light beam is transmitted to the digital galvanometer through the transmission assembly, and the metal sheet is cut into a plurality of micropores through the laser, so that the time spent on replacing the cutter is reduced, and the processing efficiency is improved; and the cost caused by frequent replacement of the cutter is also reduced, and the cost is reduced.

Preferably, a positioning frame formed by arranging a plurality of thin steel sheets in a net shape is arranged in the workpiece positioning disc, and every two adjacent grids of the positioning frame are communicated; the bottom of the workpiece positioning plate is communicated with an air vent, and the air vent is communicated with an air pump through a pipeline.

By adopting the technical scheme, after the metal sheet is placed on the positioning frame, the metal sheet is adsorbed by the air pump, so that the metal sheet is positioned, and the damage to the metal sheet can be reduced by using the positioning mode; and the net-shaped positioning frame is adopted, so that the heat dissipation effect of the metal sheet in the laser cutting process can be improved.

Preferably, the transmission assembly comprises: beam expanding mirror, wave plate and a plurality of speculum, the light-inlet end of beam expanding mirror sets up with the light-emitting window of laser source relatively, the wave plate passes through the speculum and conducts the light beam to the wave plate, the wave plate passes through the speculum and conducts the light beam to the digit mirror that shakes, the digit mirror that shakes is the diaxon scanning mirror that shakes.

By adopting the technical scheme, after the laser source emits light beams, the size of light spots of the incident light beams is adjusted through the beam expander, then the light beams are reflected and transmitted to the wave plate through the reflector, the polarization of the light beams is improved through the effect of the wave plate, and then the light beams are transmitted to the digital galvanometer through the reflector; and through the principle of diaxon scanning mirror that shakes, can work as at the micropore of cutting in-process, finely tune the angle of two reflectors in the diaxon scanning mirror that shakes for laser surely goes out the micropore, then stops the laser source, makes two reflectors in the diaxon scanning mirror that shakes carry out wider angle modulation, makes laser surely go out the micropore of another scope, and this process can cut some less micropores in interval between adjacent, has improved the practicality.

Preferably, the mounting bracket is located at least one light-emitting end position rotary type of speculum is installed and is used for sheltering from the light beam the light screen and be used for driving the first driving piece of light screen pivoted.

Through adopting above-mentioned technical scheme, when stopping cutting, start first driving piece drive light screen, reach the transfer path who blocks the light beam, reduce and be in the starting state and cause the injury to the operator when changing or fixing a position foil laser source.

Preferably, the driving assembly includes: the first linear motor is arranged on the table top of the workbench, and the second linear motor is arranged on the rotor base of the first linear motor; the drive assembly further includes: the driving box is mounted on a rotor seat of the second linear motor, one end of the sliding seat is mounted in the driving box in a sliding mode towards the direction of the Z axis, the other end of the sliding seat extends out of the driving box and is connected to the workpiece positioning disc, one end of the adjusting screw is rotatably mounted on the driving box, and the other end of the adjusting screw is mounted on the sliding seat in a threaded mode; the drive assembly further includes: and the second driving piece is used for driving the adjusting screw rod to rotate.

Through adopting above-mentioned technical scheme, start first linear electric motor and can drive the direction removal of work piece positioning dish towards the X axle, start second linear electric motor and can drive the direction removal of work piece positioning dish towards the Y axle, start the second driving piece, drive adjusting screw rotates to drive the seat that slides and slide towards the direction of Z axle, can drive the work piece positioning dish and slide towards the direction of Z axle, above-mentioned structural regulation is stable.

Preferably, the laser source includes the shell and installs the body in the shell, the shell is equipped with first louvre, the heat dissipation case is installed to the shell and the position that corresponds first louvre, heat dissipation fan, opposite side are equipped with the second louvre are installed to one side in the heat dissipation case.

Through adopting above-mentioned technical scheme, because the laser source can produce a large amount of heats at the in-process that starts, consequently after the heat distributes out from first louvre, make the heat discharge from the second louvre more fast through the heat dissipation fan, improve the radiating effect.

Preferably, the shell bottom in the shell extends along the peripheral circumference of body has top open-ended cooling tank, the heat dissipation case is equipped with inlet opening and apopore, the both ends in cooling tank communicate respectively in inlet opening and apopore, the heat dissipation case is equipped with the inlet tube that communicates in the inlet opening and communicates in the outlet pipe of apopore.

Through adopting above-mentioned technical scheme, the inlet tube is sent into cold water from the one end of cooling groove, and cold water flows along the extending direction of cooling groove, discharges through the outlet pipe again until flowing to the other end in cooling groove to accessible cold water is cooled down in the shell at the in-process that flows in the shell, improves the cooling effect.

Preferably, the outer shell is provided with a water storage tank, a diversion channel is arranged at the position of the outer shell, which is positioned at the cooling channel, a water inlet is arranged at the position of the outer shell, which corresponds to the water storage tank, and the diversion channel is communicated with the water inlet; a water pump is arranged in the water storage tank, the shell is provided with a water delivery pipe, one end of the water delivery pipe is communicated with a water outlet of the water pump, and the other end of the water delivery pipe extends to a position right above the body; the shell is provided with a control assembly for controlling the opening and closing of the water inlet.

Through adopting above-mentioned technical scheme, when the high temperature in the shell, control assembly control water inlet is opened for the water that flows in the cooling tank flows into the storage water tank through the splitter box in, then in going into the water delivery pipe with the water pump again, until make water flow out from the one end that the water pump was kept away from to the raceway and spill on the body, and the manual work is cut off the power supply to the body simultaneously, thereby reaches the cooling effect, reduces the condition that the body catches fire, improves the security.

Preferably, the control assembly comprises: a water baffle plate, a sliding groove is arranged on the side wall of the shell and corresponding to the position of the water inlet, the water baffle is arranged in the sliding groove in a sliding manner and is provided with a through hole communicated with the water inlet; the control assembly further comprises: the temperature sensor is installed in the shell, the driving cylinder is installed on the shell, a piston rod of the driving cylinder is installed on the water baffle, and the temperature sensor is electrically connected with the driving cylinder.

By adopting the technical scheme, when the temperature sensor senses that the temperature in the shell is too high, the driving cylinder is started to enable the water baffle plate to slide in the sliding groove until the water inlet corresponds to the through hole, so that the water in the cooling groove can flow into the water storage tank; this structure improves the opening efficiency of the water inlet.

In a second aspect, the present application provides a laser cutting method, which adopts the following technical scheme:

a laser cutting method is based on any laser cutting device and comprises the following steps:

the method comprises the following steps: placing a metal sheet to be processed on a positioning frame, and starting an air pump;

step two: starting the first linear motor, the second linear motor and the second driving piece, and adjusting the workpiece positioning disc to a position to be machined;

step three: starting a laser source to emit light beams, and simultaneously starting a heat dissipation fan;

step four: the beam expanding lens receives the light beam, and the light beam is reflected by the reflector and transmitted to the wave plate after being expanded;

step five: the wave plate receives the light beam and transmits the light beam to the two-axis scanning galvanometer through reflection of the reflector;

step six: two reflectors in the two-axis scanning galvanometer are subjected to mutual angle adjustment to cut a plurality of micropores;

step seven: and stopping the laser source, starting the first driving part, then starting the first linear motor, the second linear motor and the second driving part, and adjusting the workpiece positioning disc to a next position to be processed.

By adopting the technical scheme, the metal sheet is positioned on the positioning frame, then the workpiece positioning disc is adjusted to the cutting position of the two-axis scanning galvanometer aligned to the metal sheet, then the laser source is started, the laser cuts the metal sheet through the beam expander, the wave plate and the two-axis scanning galvanometer, and the mutual angle adjustment is carried out through the two reflectors in the two-axis scanning galvanometer so as to cut a plurality of micropores on the metal sheet in a small range; and then the workpiece positioning disc is adjusted to the position of the next processing range of the metal sheet for cutting, and the processing efficiency is greatly improved in the process.

In summary, the present application includes at least one of the following beneficial technical effects:

1. during machining, firstly, a metal sheet to be machined is placed on a workpiece positioning disc to be positioned, and then the workpiece positioning disc is driven to move to a position to be machined through a driving assembly; the laser source is started, the light beam is transmitted to the digital galvanometer through the transmission assembly, and the metal sheet is cut into a plurality of micropores through the laser, so that the time spent on replacing the cutter is reduced, and the processing efficiency is improved; the cost caused by frequent replacement of the cutter is reduced, and the cost is reduced;

2. after the metal sheet is placed on the positioning frame, the metal sheet is adsorbed by the air pump, so that the metal sheet is positioned, and the damage to the metal sheet can be reduced by using the positioning mode; the positioning frame is arranged in a net shape, so that the heat dissipation effect of the metal sheet in the laser cutting process can be improved;

3. when the high temperature in the shell, the control assembly controls the water inlet to be opened for water flowing in the cooling groove flows into the water storage tank through the splitter box, then is pumped into the water delivery pipe through the water pump until water flows out from the end of the water delivery pipe far away from the water pump and is sprinkled on the body, and simultaneously, the body is powered off manually, so that the cooling effect is achieved, the ignition condition of the body is reduced, and the safety is improved.

Drawings

Fig. 1 is a schematic view of the overall structure of embodiment 1 of the present application.

Fig. 2 is a schematic structural diagram of a driving assembly according to embodiment 1 of the present application.

Fig. 3 is a cross-sectional view of a structure for driving a workpiece positioning plate to move in the Z direction according to embodiment 1 of the present application.

Fig. 4 is a schematic structural diagram of a transmission assembly in embodiment 1 of the present application.

Fig. 5 is a sectional view of the digital galvanometer structure of embodiment 1 of the present application.

Fig. 6 is a schematic view of the overall structure of embodiment 2 of the present application.

Fig. 7 is a sectional view of the internal structure of the heat radiation box in embodiment 2 of the present application.

Fig. 8 is a sectional view showing the internal structure of the laser light source according to embodiment 2 of the present application.

Fig. 9 is a cross-sectional view of another perspective structure of the laser source in embodiment 2 of the present application.

Fig. 10 is a partially enlarged view of a in fig. 9.

Fig. 11 is a flow chart of the laser cutting method of the present application.

Description of reference numerals:

1. a work table; 2. a mounting frame; 21. mounting a plate; 211. perforating; 22. a visor; 23. a first driving member; 3. a workpiece positioning plate; 31. a positioning frame; 32. a vent; 33. a smoke outlet; 4. a drive assembly; 41. a first linear motor; 42. a second linear motor; 43. a drive box; 44. a sliding seat; 45. adjusting the screw rod; 46. a worm gear; 47. a worm; 48. a servo motor; 5. a digital galvanometer; 51. a housing; 511. an injection hole; 52. a lens; 53. a first reflective mirror; 54. a first adjustment motor; 55. a second reflective mirror; 56. a second adjustment motor; 6. a transmission assembly; 61. a beam expander; 62. a wave plate; 63. a mirror; 7. a laser source; 71. a housing; 711. a laser port; 712. a first heat dissipation hole; 72. a body; 73. a cooling tank; 74. a shunt slot; 75. a water inlet; 76. a water storage tank; 761. a water pump; 77. a water delivery pipe; 78. a spray head; 79. a sliding groove; 791. a water baffle; 7911. a through hole; 792. a temperature sensor; 793. a driving cylinder; 794. a connecting rod; 795. a position avoiding groove; 796. a slide bar; 797. a fan plate; 8. a heat dissipation box; 81. a second heat dissipation hole; 82. a heat dissipation fan; 83. a water inlet pipe; 84. and (5) discharging a water pipe.

Detailed Description

The present application is described in further detail below with reference to figures 1-11.

The embodiment of the application discloses laser cutting device.

Example 1

Referring to fig. 1, the laser cutting device comprises a workbench 1 and a workpiece positioning disc 3, wherein the workpiece positioning disc 3 is positioned right above a table top of the workbench 1, an opening is formed above the workpiece positioning disc 3, a driving assembly 4 is arranged between the workpiece positioning disc 3 and the workbench 1, and the driving assembly 4 is used for driving the workpiece positioning disc 3 to move towards the direction of an X/Y/Z axis; a mounting frame 2 is fixedly mounted on the table top of the workbench 1, the mounting frame 2 is a portal frame, a mounting plate 21 is arranged at a position of the mounting frame 2, which is located right above the workpiece positioning disc 3, the mounting plate 21 is downward, and a digital galvanometer 5 is fixedly mounted at a position right above the workpiece positioning disc 3, in the embodiment, the digital galvanometer 5 is a two-axis scanning galvanometer mounting plate 21, and a laser source 7 is fixedly mounted at one upward side of the two-axis scanning galvanometer mounting plate 21, and in the embodiment, the laser source 7 is a femtosecond laser; the mounting plate 21 is further provided with a transmission assembly 6 for transmitting a light beam from the laser source 7 to the digital galvanometer 5 so that the laser energy is directed down into the workpiece positioning disk 3; the metal sheet is cut when it is positioned on the work positioning plate 3.

Referring to fig. 2 and 3, the driving assembly 4 includes a first linear motor 41 and a second linear motor 42, the first linear motor 41 is fixedly installed on the table top of the worktable 1, a mover seat of the first linear motor 41 slides in the X-axis direction, the second linear motor 42 is fixedly installed on the mover seat of the first linear motor 41, and the mover seat of the second linear motor 42 slides in the Y-axis direction.

The driving assembly 4 further comprises a driving box 43, a sliding seat 44 and an adjusting screw 45, the driving box 43 is a hollow box body with an opening at the upper part, the driving box 43 is fixedly installed on a rotor seat of the second linear motor 42, one end of the sliding seat 44 is installed in the driving box 43 in a sliding manner towards the vertical direction, the other end of the sliding seat 44 extends out of the driving box 43 towards the vertical direction and is fixedly installed at the middle position of the tray bottom of the workpiece positioning tray 3; the sliding seat 44 is arranged in a hollow manner, one end of an adjusting screw 45 is rotatably arranged at the middle position of the bottom of the box in the driving box 43, the other end of the adjusting screw passes through the bottom of the sliding seat 44 and extends into the sliding seat 44, and the adjusting screw 45 is in threaded connection with the sliding seat 44; the driving assembly 4 further includes a second driving member for driving the adjusting screw rod 45 to rotate, and the adjusting screw rod 45 is driven to rotate by the second driving member, so that the sliding seat 44 can be driven to slide towards the vertical direction.

Referring to fig. 3, the second driving member includes a worm wheel 46, a worm 47 and a servo motor 48, the worm wheel 46 is sleeved on the adjusting screw 45, the worm 47 extends in a direction perpendicular to the adjusting screw 45, two ends of the worm 47 are rotatably mounted on the driving box 43, the worm wheel 46 is meshed with the worm 47, the servo motor 48 is fixedly mounted outside the driving box 43, and an output shaft of the servo motor 48 is fixedly connected to the worm 47, so as to drive the adjusting screw 45.

Referring to fig. 2 and 3, a positioning frame 31 is arranged at the bottom of the workpiece positioning plate 3, the positioning frame 31 is formed by arranging a plurality of thin steel sheets in a net shape, and a metal sheet to be processed can be arranged on the positioning frame 31; two adjacent grids of the positioning frame 31 are communicated, a plurality of air vents 32 are uniformly arranged at the bottom of the workpiece positioning plate 3, and each air vent 32 is communicated with an air pump through a pipeline, so that the metal sheet can be adsorbed on the positioning frame 31; and, the lateral wall of work piece positioning disk 3 is equipped with exhaust port 33, and exhaust port 33 passes through the pipeline intercommunication and has the air exhauster to can make the cigarette discharge when the foil in the cutting process.

Referring to fig. 4, the transmission assembly 6 includes a beam expander 61, a wave plate 62 and a plurality of reflectors 63, the beam expander 61 and the wave plate 62 are both fixedly installed on one side of the mounting plate 21 facing upwards, and a light inlet end of the beam expander 61 is arranged opposite to a light outlet of the laser source 7, so that the size of a light spot of a light beam emitted from the laser source 7 can be adjusted; the beam passing direction of the beam expanding lens 61 is vertical to the beam passing direction of the wave plate 62 in the horizontal direction, and a reflecting mirror 63 is arranged between the beam expanding lens 61 and the wave plate 62, so that the beam emitted from the beam expanding lens 61 is rotated by 90 degrees and enters the wave plate 62, and the polarization of the beam is improved; the mounting plate 21 is provided with a through hole 211 for transmitting a light beam from the upward side of the mounting plate 21 to the downward side of the mounting plate 21, a reflector 63 is fixedly mounted at the upward side of the mounting plate 21 and close to the through hole 211, and the light beam transmitted from the wave plate 62 is vertically transmitted downward to the downward side of the mounting plate 21 under the action of the reflector 63; the mounting frame 2 is positioned at the downward side of the mounting plate 21 and is fixedly provided with a reflector 63 at a position close to the through hole 211, and the light beam transmitted to the downward side of the mounting plate 21 is irradiated towards the horizontal direction under the action of the reflector 63; the digital galvanometer 5 comprises a shell 51, and the outer side wall of the shell 51 is provided with an incident hole 511 for the light beam to enter.

Be provided with light screen 22 and first driving piece 23 near the position of perforating hole 211, first driving piece 23 is the motor, first driving piece 23 fixed mounting is at mounting panel 21, the vertical up setting of output shaft of first driving piece 23, the one end fixed mounting of light screen 22 is at the output shaft of first driving piece 23, the other end extends and pierces the position directly over perforating hole 211, the level of light screen 22 is less than speculum 63 to can will wear perforating hole 211 to shelter from when laser source 7 closes, improve the security.

Referring to fig. 4 and 5, the digital galvanometer 5 further includes a lens 52, a first reflective mirror 53, a first adjustment motor 54, a second reflective mirror 55 and a second adjustment motor 56, the lens 52 is fixedly installed on a downward side of the housing 51, the first reflective mirror 53, the first adjustment motor 54, the second reflective mirror 55 and the second adjustment motor 56 are all located in the housing 51, the first reflective mirror 53 and the second reflective mirror 55 are sequentially arranged from top to bottom in the same vertical direction, the first reflective mirror 53 is arranged opposite to the injection hole 511, an output shaft of the first adjustment motor 54 and an output shaft of the second adjustment motor 56 are horizontally and vertically arranged, an output shaft of the first adjustment motor 54 is fixedly connected with the first reflective mirror 53, and an output shaft of the second adjustment motor 56 is fixedly connected with the second reflective mirror 55, so that the laser irradiated into the housing 51 from the injection hole 511 is sequentially emitted downward through the first reflective mirror 53, the second reflective mirror 55 and the lens 52; and the position of laser light emission can be controlled by adjusting the angle adjustment of the first and

second mirrors

53 and 55.

The implementation principle of the embodiment 1 is as follows: firstly, placing a metal sheet on a positioning frame 31, and starting an air pump to stably adsorb the metal sheet on the positioning frame 31; then, the first linear motor 41, the second linear motor 42 and the servo motor 48 are started to drive the position of the workpiece positioning disc 3 to move until the position of the metal sheet to be processed corresponds to the position of laser emission; then starting the laser source 7, enabling the light beam to sequentially pass through the beam expander 61, the wave plate 62, the first reflector 53, the second reflector 55 and the lens 52 and then to be emitted to the metal sheet, starting the first adjusting motor 54 and the second adjusting motor 56, and finely adjusting the angles of the first reflector 53 and the second reflector 55 to cut a micropore on the metal sheet; then stopping the laser source 7 and starting the first adjustment motor 54 and the second adjustment motor 56 to further adjust the angles of the first mirror 53 and the second mirror 55 so that another micro-hole in the small range is formed on the foil; after the micro-holes in the small range are cut, the first linear motor 41, the second linear motor 42 and the servo motor 48 are started again to adjust the movement of the metal sheet to the next range for cutting.

Example 2

Referring to fig. 6 and 7, the present embodiment is different from embodiment 1 in that the laser source 7 includes a housing 71 and a body 72, the housing 71 is fixedly mounted on the mounting plate 21, the body 72 is fixedly mounted in the housing 71, and a laser port 711 for emitting a light beam generated by the body 72 out of the housing 71 is provided at a position of an outer side wall of the housing 71 opposite to the beam expander 61; one side of the shell 71 away from the laser port 711 is provided with a first heat dissipation hole 712, one side of the shell 71 located at the first heat dissipation hole 712 is fixedly provided with a heat dissipation box 8, the first heat dissipation hole 712 is communicated in the heat dissipation box 8, one side of the heat dissipation box 8 is provided with a second heat dissipation hole 81, and the other side is fixedly provided with a heat dissipation fan 82, so that the heat generated by the body 72 can be discharged more rapidly.

Referring to fig. 6 and 7, the body 72 is located in the middle of the housing 71, a cooling groove 73 is formed in the bottom of the housing 71, the cooling groove 73 has an upward opening, the cooling groove 73 extends along the periphery of the body 72, two ends of the cooling groove 73 are communicated with the heat dissipation box 8 from the side of the housing 71 where the first heat dissipation hole 712 is formed, the end portions of the cooling groove 73 communicated with the heat dissipation box 8 are respectively provided with a water inlet hole and a water outlet hole, the water inlet hole and the water outlet hole are respectively provided with a water inlet pipe 83 and a water outlet pipe 84, cold water is conveyed into the cooling groove 73 from the water inlet pipe 83, flows to the water outlet pipe 84 along the cooling groove 73, and is discharged through the water outlet pipe 84, wherein the cold water can absorb heat in the housing 71 in the process of flowing in the cooling groove 73, and achieves a further cooling effect.

Referring to fig. 8 and 9, a diversion trench 74 is disposed at a bottom of the casing in the casing 71 and on a side away from the heat dissipation box 8, one end of the diversion trench 74 is communicated with the cooling trench 73, and the other end of the diversion trench extends to a side wall of the casing 71, a water inlet 75 is disposed on a side of the casing 71 away from the heat dissipation box 8 and corresponding to the diversion trench 74, and the water inlet 75 is communicated with the diversion trench 74; a water storage tank 76 is fixedly mounted on the outer side wall of the shell 71, a water inlet 75 is communicated with the side wall of the water storage tank 76 at a position close to the top of the tank, and a water pump 761 is fixedly mounted at the bottom of the tank in the water storage tank 76; a water pipe 77 is fixedly installed on the outer side wall of the shell 71, one end of the water pipe 77 is communicated with a water outlet of the water pump 761, the other end of the water pipe 77 extends to the top of the shell 71 and extends into the shell 71, and one end of the water pipe 77, which is far away from the water pump 761, extends to the position right above the body 72 and is fixedly provided with a spray head 78; the casing 71 is provided with a control assembly for controlling the opening and closing of the water inlet 75, so that when the temperature in the casing 71 is too high to a critical point, the water inlet 75 can be opened, water in the cooling groove 73 flows into the water storage tank 76, then the water pump 761 is connected to the spray head 78 through the water pump 761, the body 72 is cooled in a large range, and the safety is improved.

Referring to fig. 9 and 10, a sliding groove 79 is formed in the side wall of the housing 71 and near the water inlet 75, the sliding groove 79 extends in the horizontal direction, the sliding groove 79 is communicated with the water inlet 75, the control assembly comprises a water baffle 791, a temperature sensor 792 and a driving cylinder 793, the water baffle 791 is slidably mounted on the housing 71 through the sliding groove 79, a through hole 7911 is formed in the water baffle 791, and the through hole 7911 is communicated with the water inlet 75; drive actuating cylinder 793 fixed mounting at the lateral wall of shell 71, the piston rod extension that drives actuating cylinder 793 slides groove 79 and fixed connection in breakwater 791, and temperature sensor 792 fixed mounting is at the inner wall of shell 71, and temperature sensor 792 is connected with drive actuating cylinder 793 electricity to when temperature sensor 792 senses the temperature in the shell 71 when too high, can slide through drive breakwater 791 and make and block or communicate water inlet 75.

One end fixed mounting that driving cylinder 793 was kept away from to breakwater 791 has connecting rod 794, the position that shell 71 inside wall and corresponding connecting rod 794 are equipped with keeps away a groove 795, the one end fixed mounting that breakwater 791 was kept away from to connecting rod 794 has slide bar 796, slide bar 796 is kept away from the one end of connecting rod 794 and is worn out to keep away a groove 795 and fixed mounting has fan board 797, fan board 797 and splitter box 74 are located the both sides of shell 71 respectively, thereby can drive fan board 797 and together remove at gliding in-process when breakwater 791, thereby reach the cooling effect to in the shell 71.

The embodiment of the application also discloses a laser cutting method, which comprises the following steps with reference to fig. 11:

s1: placing a metal sheet to be processed on the positioning frame 31, and starting an air pump to stabilize the metal sheet on the positioning frame 31;

s2: starting the first linear motor 41, the second linear motor 42 and the servo motor 48, and adjusting the workpiece positioning disc 3 to move the metal sheet to a position to be processed;

s3: starting the laser source 7 to emit a light beam, simultaneously starting the heat dissipation fan 82, and introducing cold water into the water inlet pipe 83;

s4: the beam expander 61 receives the light beam, and the light beam is reflected and transmitted to the wave plate 62 by the reflector 63 after being expanded;

s5: the wave plate 62 receives the light beam, the light beam enters the entrance hole 511 through the reflector 63, and finally the light beam enters the metal sheet through the first reflector 53, the second reflector 55 and the lens 52 in sequence;

s6: starting a first adjusting motor 54 and a second adjusting motor 56, finely adjusting the mutual angle of the first reflecting mirror 53 and the second reflecting mirror 55, and cutting a micropore;

s7: stopping the laser source 7, starting the first driving part 23, starting the first adjusting motor 54 and the second adjusting motor 56, adjusting the mutual angle of the first reflecting mirror 53 and the second reflecting mirror 55 to a greater extent, and cutting a next micropore;

s8: repeating the operations of S6 and S7 to cut a plurality of micropores in a small range;

s9: stopping the laser source 7, starting the first driving member 23, starting the first linear motor 41, the second linear motor 42 and the servo motor 48, and adjusting the metal sheet to the next position to be processed.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A laser cutting device comprises a workbench (1) and a workpiece positioning disc (3), wherein the workpiece positioning disc (3) is installed on the workbench (1) and used for positioning a workpiece to be machined, and is characterized in that the workbench (1) is provided with a mounting rack (2), a digital galvanometer (5) is arranged on the mounting rack (2) and at a position right above the workpiece positioning disc (3), and the mounting rack (2) is further provided with a laser source (7) and a transmission assembly (6) for transmitting a light beam emitted by the laser source (7) to the digital galvanometer (5); the workbench (1) is provided with a driving component (4) for driving the workpiece positioning disc (3) to move towards the X/Y/Z axis direction;

the laser source (7) comprises a shell (71) and a body (72) arranged in the shell (71), wherein the shell (71) is provided with a first heat dissipation hole (712), a heat dissipation box (8) is arranged at the position, corresponding to the first heat dissipation hole (712), of the shell (71), a heat dissipation fan (82) is arranged at one side in the heat dissipation box (8), and a second heat dissipation hole (81) is arranged at the other side;

a cooling groove (73) with an upper opening is formed in the shell bottom in the shell (71) in a circumferential extending mode along the periphery of the body (72), the heat dissipation box (8) is provided with a water inlet hole and a water outlet hole, two ends of the cooling groove (73) are respectively communicated with the water inlet hole and the water outlet hole, and the heat dissipation box (8) is provided with a water inlet pipe (83) communicated with the water inlet hole and a water outlet pipe (84) communicated with the water outlet hole;

the shell (71) is provided with a water storage tank (76), a diversion trench (74) is arranged at the position of the shell (71) positioned on the cooling trench (73), a water inlet (75) is arranged at the position of the shell (71) corresponding to the water storage tank (76), and the diversion trench (74) is communicated with the water inlet (75); a water pump (761) is arranged in the water storage tank (76), a water conveying pipe (77) is arranged on the shell (71), one end of the water conveying pipe (77) is communicated with a water outlet of the water pump (761), and the other end of the water conveying pipe extends to a position right above the body (72); the shell (71) is provided with a control component for controlling the opening and closing of the water inlet (75);

the control assembly includes: the water inlet (75) is arranged on the side wall of the shell (71), a sliding groove (79) is formed in the position, corresponding to the water inlet (75), of the side wall of the shell (71), the water baffle (791) is installed in the sliding groove (79) in a sliding mode, and a through hole (7911) communicated with the water inlet (75) is formed in the water baffle (791); the control assembly further comprises: the temperature sensor (792) is installed in the shell (71), the driving cylinder (793) is installed in the shell (71), a piston rod of the driving cylinder (793) is installed on the water baffle (791), and the temperature sensor (792) is electrically connected with the driving cylinder (793);

one end fixed mounting that actuating cylinder (793) was kept away from to breakwater (791) has connecting rod (794), shell (71) inside wall and the position that corresponds connecting rod (794) are equipped with keeps away a groove (795), the one end fixed mounting that breakwater (791) was kept away from in connecting rod (794) has slide bar (796), the one end that connecting rod (794) were kept away from in slide bar (796) is worn out to keep away a groove (795) and fixed mounting has fan board (797), fan board (797) and splitter box (74) are located the both sides of shell (71) respectively.

2. A laser cutting apparatus according to claim 1, wherein: a positioning frame (31) formed by arranging a plurality of thin steel sheets in a net shape is arranged in the workpiece positioning disc (3), and every two adjacent grids of the positioning frame (31) are communicated; the bottom of the workpiece positioning disc (3) is communicated with an air vent (32), and the air vent (32) is communicated with an air pump through a pipeline.

3. A laser cutting device according to claim 1, wherein: the transmission assembly (6) comprises: beam expanding mirror (61), wave plate (62) and a plurality of speculum (63), the light-emitting window of advancing light end and laser source (7) of beam expanding mirror (61) sets up relatively, wave plate (62) are through speculum (63) with light beam conduction to wave plate (62), wave plate (62) are shaken mirror (5) with light beam conduction to digit through speculum (63), mirror (5) are shaken for the diaxon scanning to the digit.

4. A laser cutting apparatus according to claim 3, wherein: the mounting rack (2) is located at least one light-emitting end position rotary type of reflector (63) is installed and is used for sheltering from light beam's light screen (22) and be used for driving light screen (22) pivoted first driving piece (23).

5. A laser cutting apparatus according to claim 1, wherein: the drive assembly (4) comprises: the linear motor comprises a first linear motor (41) and a second linear motor (42), wherein the rotor base moves towards the X-axis direction, the rotor base moves towards the Y-axis direction, the first linear motor (41) is installed on the table top of the workbench (1), and the second linear motor (42) is installed on the rotor base of the first linear motor (41); the drive assembly (4) further comprises: the driving box (43) is installed on a rotor seat of the second linear motor (42), one end of the sliding seat (44) is installed in the driving box (43) in a sliding mode towards the Z-axis direction, the other end of the sliding seat extends out of the driving box (43) and is connected to the workpiece positioning disc (3), one end of the adjusting screw rod (45) is rotatably installed on the driving box (43), and the other end of the adjusting screw rod is installed on the sliding seat (44) in a threaded mode; the drive assembly (4) further comprises: and the second driving piece is used for driving the adjusting screw rod (45) to rotate.

6. A laser cutting method, characterized in that, based on the laser cutting device of any one of claims 1 to 5, the cutting method is as follows:

the method comprises the following steps: placing a metal sheet to be processed on a positioning frame (31), and starting an air pump;

step two: starting a first linear motor (41), a second linear motor (42) and a second driving piece, and adjusting a workpiece positioning disc (3) to a position to be processed;

step three: starting a laser source (7) to emit light beams, and simultaneously starting a heat dissipation fan (82);

step four: the beam expanding lens (61) receives the light beam, and the light beam is reflected and transmitted to the wave plate (62) through the reflecting mirror (63) after being expanded;

step five: the wave plate (62) receives the light beam, and the light beam is reflected and transmitted to the two-axis scanning galvanometer through the reflecting mirror (63);

step seven: stopping the laser source (7), starting the first driving part (23), then starting the first linear motor (41), the second linear motor (42) and the second driving part, and adjusting the workpiece positioning disc (3) to a next position to be processed.