CN114523214A

CN114523214A - High-precision laser cutting machine for automobile sheet metal parts

Info

Publication number: CN114523214A
Application number: CN202210208516.XA
Authority: CN
Inventors: 杜屹; 牛钢
Original assignee: Hubei Haojie Mechanical And Electrical Technology Co ltd
Current assignee: Hubei Haojie Mechanical And Electrical Technology Co ltd
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2022-05-24

Abstract

The invention discloses a high-precision laser cutting machine for automobile sheet metal parts, and particularly relates to the technical field of laser cutting machines. According to the invention, the screw rod, the threaded cap, the protective frame, the toothed bar, the gear, the polishing disc, the fan assembly, the middle box and the collecting filter box are arranged, the gear moves to the right and is meshed with the toothed bar, the gear drives the connecting shaft and the polishing disc to rotate, the polishing disc grinds dirt and unevenness adhered to the surface of an original, and the fan assembly absorbs and collects sundries and waste materials after cleaning through the middle box.

Description

High-precision laser cutting machine for automobile sheet metal parts

Technical Field

The invention relates to the technical field of laser cutting machines, in particular to a high-precision laser cutting machine for an automobile sheet metal part.

Background

Laser emitted by the laser cutting machine is focused into a laser beam with high power density through the optical path system, the laser beam irradiates the surface of a workpiece to enable the workpiece to reach a melting point or a boiling point, the workpiece is cut, and molten or gasified metal is blown away by high-pressure gas coaxial with the laser beam while the laser cutting is carried out.

The laser cutting processing uses invisible light beams to replace the traditional mechanical knife, has the characteristics of high precision, quick cutting, no limitation on cutting patterns, automatic typesetting, material saving, smooth cut, low processing cost and the like, and can gradually improve or replace the traditional metal cutting process equipment. The mechanical part of the laser tool bit is not in contact with the workpiece, so that the surface of the workpiece cannot be scratched in the working process; the laser cutting speed is high, the cut is smooth and flat, and subsequent processing is generally not needed; the cutting heat affected zone is small, the deformation of the plate is small, and the cutting seam is narrow; the notch has no mechanical stress and no shearing burr; the processing precision is high, the repeatability is good, and the surface of the material is not damaged; the numerical control programming can be used for processing any plan, the whole board with large breadth can be cut, a die does not need to be opened, and the method is economical and time-saving.

Laser cutting is achieved by applying high power density energy generated after laser focusing. Under the control of a computer, the laser is discharged through pulses, so that controlled pulse laser with high repetition frequency is output, a light beam with certain frequency and certain pulse width is formed, the pulse laser beam is conducted and reflected through a light path and focused on the surface of a processed object through a focusing lens group to form fine and high-energy-density light spots, and the focal spots are positioned near a surface to be processed to instantly melt or gasify the processed material at high temperature. Each high-energy laser pulse can be used for sputtering a fine hole on the surface of the object, and under the control of computer the laser processing head and the material to be processed can be continuously and relatively moved to make point-punching according to the pre-drawn pattern so as to make the object be processed into the required form.

During the cutting process of the laser cutting machine, a light beam is focused into a small focal point through a lens of a cutting head, so that high power density is achieved at the focal point, wherein the cutting head is fixed on a z-axis. At this time, the heat input by the light beam far exceeds the partial heat reflected, conducted or diffused by the material, the material is heated to the melting and vaporizing temperature quickly, and simultaneously, a high-speed airflow blows out the melted and vaporized material from the coaxial or non-coaxial side to form a hole for cutting the material. And with the relative movement of the focus and the material, the hole forms a continuous slit with a narrow width, and the cutting of the material is completed.

The state of raw materials directly influences the laser cutting quality in the laser cutting process, the state on material surface influences its absorption to the light beam, especially surface roughness and the apparent change that the surface oxidation layer can cause the surface absorption rate, to the more serious raw and other materials of corrosion or greasy dirt, not only can influence the speed of laser cutting, still can lead to appearing exploding the hole or cutting constantly in cutting process, and the high-pressure auxiliary gas probably leads to its condition of splashing that appears when blowing away the waste material that melts, consequently need the high laser cutting machine for car sheet metal component of a precision to solve above-mentioned problem.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides a high-precision laser cutting machine for an automobile sheet metal part, and the invention aims to solve the technical problems that: the state of raw materials in the laser cutting process directly influences the laser cutting quality, and the state of material surface influences its absorption to the light beam, and surface roughness and surface oxide layer especially can cause the obvious change of surface absorptivity, to the more serious raw and other materials of corrosion or greasy dirt, not only can influence the speed of laser cutting, still can lead to appearing popping one's breath or cutting constantly in the cutting process, and the high pressure auxiliary gas probably leads to its problem that the condition of splashing appears when blowing away the waste material that melts.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a high laser cutting machine for car sheet metal component of precision, includes the cutting machine stage body and protective frame, two direction slide rails have been seted up to the upper surface of cutting machine stage body, direction slide rail inner wall is provided with the direction and removes the frame, two the upper surface that the frame was removed in the direction is connected with the lower fixed surface of same removal support, the surface of removing the support is provided with the slide arm, the lower surface of slide arm is provided with the shower nozzle.

The left and right sides face of protection frame all is provided with two screw caps, and the front side is two the surface threaded connection of screw cap inner wall and same lead screw, two connecting holes have all been seted up to the left and right sides face of protection frame, and the front side is two the outer surface overlap joint of connecting hole inner wall and same ratch, two the looks back of ratch all meshes there are six gears, the lower surface of gear and the top fixed connection of connecting axle, the bottom of connecting axle and the last fixed surface of the mill of polishing are connected.

The left and right sides face of protection frame inner wall respectively with the left and right sides face overlap joint of middle case, the upper surface of middle case is provided with coupling hose, coupling hose's setting is at the upper surface of diaphragm, coupling hose's top and the bottom of intermediate tube are linked together, the other end of intermediate tube is linked together with the upper surface of collecting the filter box.

As a further scheme of the invention: the position of protection frame is corresponding with the position of shower nozzle, the front and the back of direction removal frame respectively with two relative one end fixed connection of extension rod, the extension rod sets up to L shape.

As a further scheme of the invention: the lower surface of extension rod and the top fixed connection of two electronic hydraulic stem, two the bottom of electronic hydraulic stem is connected with the last fixed surface of same link, the left side the right flank of link and drive assembly's left surface fixed connection, drive assembly's output shaft and the left end fixed connection of lead screw, the lead screw sets up the left surface at the right side link.

As a further scheme of the invention: the two ends of the toothed bar are fixedly connected with the opposite surfaces of the left side connecting frame and the right side connecting frame respectively, the outer surface of the connecting shaft is provided with a bearing, the front side and the rear side of the bearing are both provided with fixing rods, and the other ends of the fixing rods are fixedly connected with the inner wall of the protective frame.

As a further scheme of the invention: the inner wall of the protective frame is provided with two shielding plates, the positions of the shielding plates correspond to those of the gears, the upper surface of the middle box is fixedly connected with the bottom ends of the two elastic assemblies, and the top ends of the elastic assemblies are fixedly connected with the lower surface of the transverse plate.

As a further scheme of the invention: the back of the transverse plate is fixedly connected with one ends of the front surfaces of the two transverse rods, and the other ends of the transverse rods are fixedly connected with the inner wall of the protective frame.

As a further scheme of the invention: the lower surface of the collection filter box is fixedly connected with the upper surface of the rear side baffle plate, the upper surface of the rear side baffle plate is fixedly connected with the lower surface of the fan assembly, and the output end of the fan assembly is communicated with the collection filter box.

As a further scheme of the invention: the left side face and the right side face of the middle box are fixedly connected with the opposite faces of the two sliding blocks respectively, the outer surfaces of the sliding blocks are connected with the inner wall of the sliding groove in a sliding mode, and the sliding groove is formed in the upper surface of the protective frame.

As a further scheme of the invention: the front and the back of middle case respectively with the opposite face fixed connection of two extension boards, the upper surface of extension board sets up for the slope, the feed port has all been seted up to the front and the back of middle case, the position of feed port is corresponding with the position of extension board.

The invention has the beneficial effects that:

1. according to the invention, the driving assembly, the lead screw, the threaded cap, the protective frame, the toothed bar, the gear, the polishing disc, the fan assembly, the middle box and the collecting filter box are arranged, so that the driving assembly is directly controlled to work, the driving assembly drives the lead screw to rotate, at the moment, the threaded cap and the protective frame move rightwards, the gear moves rightwards and is meshed with the toothed bar, the gear drives the connecting shaft and the polishing disc to rotate, the polishing disc grinds dirt and unevenness adhered to the surface of an original, and the fan assembly absorbs and collects the cleaned sundries and waste materials through the middle box;

2. according to the invention, the protective frame, the middle box, the elastic component, the sliding block and the sliding groove are arranged, the elastic component applies downward elastic force to the middle box, the middle box and the extension plate are ensured to be in contact with the cutting machine table body, meanwhile, the protective frame blows away melted waste materials by high-pressure gas to be shielded, meanwhile, the middle box is absorbed by the fan component, the waste materials are collected and cleaned while the probability of splashing of the waste materials is reduced, the time and labor cost required by subsequent waste material cleaning are saved while the subsequent laser cutting process is ensured to be smoothly carried out, and the protective frame moves along with the guide moving frame, so that the waste material cleaning and collecting process is ensured to be carried out along with the moving working process of the spray head.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a perspective structural view of the protection frame of the present invention;

FIG. 3 is a schematic top perspective view of a protection frame according to the present invention;

FIG. 4 is a schematic bottom perspective view of the protection frame of the present invention;

FIG. 5 is a perspective view of the gear of the present invention;

FIG. 6 is an enlarged view of part A of the present invention;

FIG. 7 is an enlarged view of part B of the present invention;

in the figure: 1. a cutter table body; 2. a protective frame; 3. a guide slide rail; 4. a guide moving frame; 5. moving the support; 6. a slide arm; 7. a spray head; 8. an extension rod; 9. an electro-hydraulic lever; 10. a connecting frame; 11. a drive assembly; 12. a screw rod; 13. a threaded cap; 14. a rack bar; 15. connecting holes; 16. a gear; 17. a connecting shaft; 18. a bearing; 19. grinding disc; 20. fixing the rod; 21. a shielding plate; 22. an intermediate box; 23. an extension plate; 24. a feed port; 25. an elastic component; 26. a transverse plate; 27. a connecting hose; 28. a cross bar; 29. an intermediate pipe; 30. a collecting filter box; 31. a fan assembly; 32. a slider; 33. a chute.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1-7, the invention provides a high-precision laser cutting machine for automobile sheet metal parts, which comprises a cutting machine table body 1 and a protective frame 2, wherein two guide slide rails 3 are arranged on the upper surface of the cutting machine table body 1, a guide moving frame 4 is arranged on the inner walls of the guide slide rails 3, through the arrangement of the guide sliding rail 3 and the guide moving frame 4, the guide moving frame 4 is matched with the guide sliding rail 3 to control the spray head 7 to move forwards and backwards, the guide moving frame 4 is matched with the sliding arm 6 to control the spray head 7 to move leftwards and rightwards, therefore, the combination of the front and back movement and the left and right movement of the spray head 7 can realize various movement tracks, the laser cutting of original pieces in various shapes is convenient, the upper surfaces of the two guide moving frames 4 are fixedly connected with the lower surface of the same moving support 5, the outer surface of the moving support 5 is provided with a sliding arm 6, and the lower surface of the sliding arm 6 is provided with the spray head 7.

The left side and the right side of the protective frame 2 are both provided with two screw caps 13, the protective frame 2 can be smoothly controlled to move in the horizontal direction due to the screw action between the screw caps 13 when the screw rod 12 rotates, the protective frame 2 can move simultaneously along with the movement of the spray head 7 by the arrangement of the screw rod 12 and the screw caps 13, the whole laser cutting process can be conveniently protected, the inner walls of the two screw caps 13 at the front side are in threaded connection with the outer surface of the same screw rod 12, the left side and the right side of the protective frame 2 are both provided with two connecting holes 15, the gear rods 14 support and limit the protective frame 2 to a certain extent through the connecting holes 15 by arranging the connecting holes 15 and the gear rods 14, the weight of the protective frame 2 is prevented from being concentrated on the surface of the screw rod 12, the protective frame 2 is ensured to stably move in the left and right directions, the inner walls of the two connecting holes 15 at the front side are lapped with the outer surface of the same gear rod 14, the back surfaces of the two gear rods 14 are both meshed with six gears 16, through setting up gear 16 and ratch 14, gear 16 can mesh with ratch 14 when being driven by protective frame 2 and carrying out left right direction removal, meshing action control gear 16 between gear 16 and the ratch 14 and connecting axle 17 rotate, and then conveniently control the rotation operation of connecting axle 17 and polishing dish 19, make things convenient for polishing dish 19's rotation grinding cleaning process, gear 16's lower surface and connecting axle 17's top fixed connection, connecting axle 17's bottom and polishing dish 19's upper surface fixed connection.

The left side surface and the right side surface of the inner wall of the protective frame 2 are respectively lapped with the left side surface and the right side surface of the middle box 22, the upper surface of the middle box 22 is provided with a connecting hose 27, the connecting hose 27 is arranged to realize the communication between the middle pipe 29 and the middle box 22, the middle box 22 can be ensured to move up and down simultaneously, the connecting hose 27 is ensured to be communicated when being deformed, the connecting hose 27 is arranged on the upper surface of the transverse plate 26, the top end of the connecting hose 27 is communicated with the bottom end of the middle pipe 29, the other end of the middle pipe 29 is communicated with the upper surface of the collecting filter box 30, and the collecting filter box 30 is arranged to filter and collect waste materials and sundries in the air.

As shown in fig. 1, the position of the protection frame 2 corresponds to the position of the nozzle 7, the front and the back of the guiding movable frame 4 are respectively fixedly connected with the opposite ends of two extending rods 8, and the extending rods 8 are L-shaped.

As shown in fig. 2 and 6, the lower surface of the extension rod 8 is fixedly connected with the top ends of the two electric hydraulic rods 9, the bottom ends of the two electric hydraulic rods 9 are fixedly connected with the upper surface of the same connecting frame 10, through the arrangement of the electric hydraulic rods 9, the electric hydraulic rods 9 conveniently control the up-down movement of the connecting frame 10 and the protective frame 2, the movement process of the polishing disc 19 is realized, whether the polishing disc 19 is in contact with an original or not is controlled, the right side surface of the left connecting frame 10 is fixedly connected with the left side surface of the driving assembly 11, the output shaft of the driving assembly 11 is fixedly connected with the left end of the lead screw 12, and the lead screw 12 is arranged on the left side surface of the right connecting frame 10.

As shown in fig. 2 and 4, two ends of the rack bar 14 are respectively fixedly connected with the opposite surfaces of the left and right side connecting frames 10, a bearing 18 is arranged on the outer surface of the connecting shaft 17, the bearing 18 and a fixing rod 20 are arranged, the fixing rod 20 fixes the bearing 18, the bearing 18 supports and limits the connecting shaft 17 and the polishing disc 19, it is ensured that the connecting shaft 17 and the gear 16 can stably rotate, the gear 16 and the rack bar 14 are stably engaged, the fixing rods 20 are arranged on the opposite surfaces of the bearings 18 on the front and rear sides, and the other end of the fixing rod 20 is fixedly connected with the inner wall of the protection frame 2.

As shown in fig. 2 and 3, two shielding plates 21 are arranged on the inner wall of the protective frame 2, by arranging the shielding plates 21, the shielding plates 21 shield and protect the meshing position of the gear 16 and the rack bar 14, the occurrence of the influence meshing of sundries between the rack bar 14 and the gear 16 is avoided, the position of the shielding plates 21 corresponds to the position of the gear 16, the upper surface of the middle box 22 is fixedly connected with the bottom ends of the two elastic components 25, by arranging the elastic components 25, the sliding blocks 32 and the sliding grooves 33 play a role in guiding and limiting the up-and-down movement of the middle box 22, the middle box 22 is prevented from shaking randomly, meanwhile, the elastic components 25 exert downward acting force on the middle box 22, the stable contact between the middle box 22 and the extension plate 23 and the surface of an original is ensured, and the top end of the elastic components 25 is fixedly connected with the lower surface of the transverse plate 26.

As shown in fig. 2, the back of the horizontal plate 26 is fixedly connected to one end of the front of the two cross bars 28, and the other end of the cross bar 28 is fixedly connected to the inner wall of the protection frame 2.

As shown in fig. 2, the lower surface of the collection filter box 30 is fixedly connected to the upper surface of the rear shielding plate 21, the upper surface of the rear shielding plate 21 is fixedly connected to the lower surface of the fan assembly 31, the fan assembly 31 is arranged, the fan assembly 31 can draw air, the air inside the protection frame 2 and impurities or waste materials carried in the air can be conveniently drawn through the middle box 22, and the output end of the fan assembly 31 is communicated with the collection filter box 30.

As shown in fig. 2, the left and right side surfaces of the intermediate box 22 are fixedly connected to the opposing surfaces of the two sliders 32, respectively, the outer surfaces of the sliders 32 are slidably connected to the inner wall of the slide groove 33, and the slide groove 33 is provided on the upper surface of the protection frame 2.

As shown in fig. 2 and 5, the front and the back of the middle box 22 are respectively fixedly connected with the opposite surfaces of the two extending plates 23, the upper surfaces of the extending plates 23 are obliquely arranged, the extending plates 23 are arranged, and the upper surfaces of the extending plates 23 are obliquely arranged, so that when the middle box 22 sucks gas, waste materials and impurities contained in the gas smoothly move upwards along the extending plates 23 to the middle box 22, the front and the back of the middle box 22 are provided with the feeding holes 24, and the positions of the feeding holes 24 correspond to the positions of the extending plates 23.

The working principle of the invention is as follows: directly controlling the work of the electric hydraulic rod 9, wherein the electric hydraulic rod 9 drives the connecting frame 10 and the protective frame 2 to move downwards, when the grinding disc 19 is in contact with the surface of an original, the electric hydraulic rod 9 is controlled to stop working, then the driving component 11 is controlled to work, the driving component 11 drives the screw rod 12 to rotate, the screw rod 12 controls the protective frame 2 to move rightwards by using the screw action between the screw rod 12 and the screw cap 13, the protective frame 2 moves rightwards and drives the gear 16 to be meshed with the toothed bar 14, the gear 16 rotates and drives the connecting shaft 17 and the grinding disc 19 to rotate, the grinding disc 19 grinds and cleans dirt on the surface of the original, the fan component 31 is controlled to work, the fan component 31 pumps gas inside the protective frame 2 through the collecting filter box 30 and the middle box 22 while working, and the sundries falling from the grinding and cleaning are pumped into the middle box 22 and transferred into the collecting filter box 30 to be filtered, after the grinding clearance, control drive assembly 11 stop work, control electronic hydraulic stem 9 afterwards drives link 10 and protective frame 2 rebound, after protective frame 2 and middle box 22 all separated with the original paper, control electronic hydraulic stem 9 stop work, control 7 work emission laser of shower nozzle afterwards and carry out cutting operation can.

In summary, the present invention:

according to the invention, the driving component 11, the screw rod 12, the screw cap 13, the protective frame 2, the toothed bar 14, the gear 16, the polishing disc 19, the fan component 31, the middle box 22 and the collecting filter box 30 are arranged, the driving component 11 is directly controlled to work, the driving component 11 drives the screw rod 12 to rotate, at the moment, the screw cap 13 and the protective frame 2 move rightwards, the gear 16 moves rightwards and is meshed with the toothed bar 14, the gear 16 drives the connecting shaft 17 and the polishing disc 19 to rotate, the polishing disc 19 grinds dirt and unevenness adhered to the surface of an original, and the fan component 31 absorbs and collects the cleaned impurities and waste materials through the middle box 22.

According to the invention, by arranging the protective frame 2, the middle box 22, the elastic component 25, the sliding block 32 and the sliding groove 33, the elastic component 25 applies downward elastic force to the middle box 22, the middle box 22 and the extension plate 23 are ensured to be in contact with the cutting machine table body 1, meanwhile, the protective frame 2 shields the high-pressure gas blown molten waste, meanwhile, the middle box 22 is absorbed by the fan component 31, the collection and cleaning of the waste are realized while the probability of waste splashing is reduced, the time and labor cost required by the subsequent waste cleaning are saved while the subsequent laser cutting process is ensured to be smoothly carried out, and the protective frame 2 moves along with the guide moving frame 4, and the processes of cleaning and collecting the waste are ensured to be carried out along with the moving working process of the spray head 7.

The points to be finally explained are: first, in the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounted," "connected," and "connected" should be understood broadly, and may be a mechanical connection or an electrical connection, or a communication between two elements, and may be a direct connection, and "upper," "lower," "left," and "right" are only used to indicate a relative positional relationship, and when the absolute position of the object to be described is changed, the relative positional relationship may be changed;

secondly, the method comprises the following steps: in the drawings of the disclosed embodiments of the invention, only the structures related to the disclosed embodiments are referred to, other structures can refer to common designs, and the same embodiment and different embodiments of the invention can be combined with each other without conflict;

and finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.

Claims

1. The utility model provides a high laser cutting machine for car sheet metal component of precision, includes cutting machine stage body (1) and protective frame (2), its characterized in that: the upper surface of the cutting machine table body (1) is provided with two guide sliding rails (3), the inner walls of the guide sliding rails (3) are provided with guide moving frames (4), the upper surfaces of the two guide moving frames (4) are fixedly connected with the lower surface of the same moving support (5), the outer surface of the moving support (5) is provided with a sliding arm (6), and the lower surface of the sliding arm (6) is provided with a spray head (7);

the left side surface and the right side surface of the protective frame (2) are respectively provided with two threaded caps (13), the inner walls of the two threaded caps (13) on the front side are in threaded connection with the outer surface of the same screw rod (12), the left side surface and the right side surface of the protective frame (2) are respectively provided with two connecting holes (15), the inner walls of the two connecting holes (15) on the front side are in lap joint with the outer surface of the same toothed bar (14), the back surfaces of the two toothed bars (14) are respectively meshed with six gears (16), the lower surface of each gear (16) is fixedly connected with the top end of a connecting shaft (17), and the bottom end of the connecting shaft (17) is fixedly connected with the upper surface of a polishing disc (19);

the left and right sides face of protective frame (2) inner wall respectively with the left and right sides face overlap joint of middle case (22), the upper surface of middle case (22) is provided with coupling hose (27), the setting of coupling hose (27) is at the upper surface of diaphragm (26), the top of coupling hose (27) is linked together with the bottom of intermediate pipe (29), the other end of intermediate pipe (29) is linked together with the upper surface of collecting filter box (30).

2. The laser cutting machine for the automobile sheet metal part with high precision according to claim 1, is characterized in that: the position of protective frame (2) is corresponding with the position of shower nozzle (7), the front and the back of direction removal frame (4) respectively with two extension rod (8) relative one end fixed connection, extension rod (8) set up to L shape.

3. The laser cutting machine for the automobile sheet metal part with high precision according to claim 2, is characterized in that: the lower surface of extension rod (8) and the top fixed connection of two electronic hydraulic stem (9), two the bottom of electronic hydraulic stem (9) and the last fixed surface of same link (10) are connected, the left side the right flank of link (10) and the left surface fixed connection of drive assembly (11), the output shaft of drive assembly (11) and the left end fixed connection of lead screw (12), lead screw (12) set up the left surface at right side link (10).

4. The laser cutting machine for the automobile sheet metal part with high precision according to claim 3, is characterized in that: the two ends of the toothed bar (14) are fixedly connected with the opposite surfaces of the left side connecting frame and the right side connecting frame (10) respectively, bearings (18) are arranged on the outer surface of the connecting shaft (17), fixing rods (20) are arranged on the back surfaces of the bearings (18), and the other ends of the fixing rods (20) are fixedly connected with the inner wall of the protective frame (2).

5. The laser cutting machine for the automobile sheet metal part with high precision according to claim 1, is characterized in that: the inner wall of the protective frame (2) is provided with two shielding plates (21), the positions of the shielding plates (21) correspond to the positions of the gears (16), the upper surface of the middle box (22) is fixedly connected with the bottom ends of the two elastic components (25), and the top ends of the elastic components (25) are fixedly connected with the lower surface of the transverse plate (26).

6. The laser cutting machine for the automobile sheet metal part with high precision according to claim 5, is characterized in that: the back of the transverse plate (26) is fixedly connected with one ends of the front surfaces of the two transverse rods (28), and the other ends of the transverse rods (28) are fixedly connected with the inner wall of the protective frame (2).

7. The laser cutting machine for the automobile sheet metal part with high precision according to claim 5, is characterized in that: the lower surface of the collection filter box (30) is fixedly connected with the upper surface of the rear side baffle plate (21), the upper surface of the rear side baffle plate (21) is fixedly connected with the lower surface of the fan assembly (31), and the output end of the fan assembly (31) is communicated with the collection filter box (30).

8. The laser cutting machine for the automobile sheet metal part with high precision according to claim 1, is characterized in that: the left side face and the right side face of the middle box (22) are fixedly connected with opposite faces of the two sliding blocks (32) respectively, the outer surfaces of the sliding blocks (32) are connected with the inner wall of the sliding groove (33) in a sliding mode, and the sliding groove (33) is formed in the upper surface of the protection frame (2).

9. The laser cutting machine for the automobile sheet metal part with high precision according to claim 1, is characterized in that: the front and the back of middle case (22) respectively with the opposite face fixed connection of two extension boards (23), the upper surface of extension board (23) sets up for the slope, feed port (24) have all been seted up to the front and the back of middle case (22), the position of feed port (24) corresponds with the position of extension board (23).