Laser cutting machine for metal plate cutting and cutting process

Abstract

The invention relates to the technical field of laser cutting, and provides a laser cutting machine for metal plate cutting and a cutting technology.The laser cutting machine for metal plate cutting comprises a rack and a laser cutting head, the laser cutting head is movably arranged on the rack through a portal frame, and the laser cutting machine for metal plate cutting further comprises a workbench, a water cooling mechanism, an inductor and an air cooling mechanism; the workbench is fixedly connected to the rack, the water cooling mechanism is used for conducting water cooling on the workbench, the multiple inductors are installed on the edge of the workbench and used for inducing the position of the laser cutting head and controlling the water supply amount of the corresponding position, and the air cooling mechanism is arranged at the laser cutting head and used for conducting air cooling on the laser cutting position. By means of the technical scheme, the problem that in the prior art, thermal distortion is formed at the cutting edge through laser cutting, and the machining quality is affected is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of laser cutting, and specifically, to a laser cutting machine and a cutting process for sheet metal cutting. Background Art

[0002] Sheet metal processing is to cut and bend metal sheets into specific shapes. To ensure cutting accuracy, a laser cutting machine is generally used to cut metal sheets.

[0003] The laser cutting machine uses a high-power density laser beam to irradiate the material to be cut, so that the material is quickly heated to the vaporization temperature and evaporated to form holes. As the beam moves relative to the material, the holes continuously form a very narrow slit, completing the cutting of the material. During the process of laser cutting the sheet metal, due to the high-power laser heating the material, a high-temperature environment will be quickly formed locally on both sides of the cutting trajectory, resulting in thermal distortion at the cutting edge, thus affecting the cutting accuracy and quality. Summary of the Invention

[0004] The present invention provides a laser cutting machine and a cutting process for sheet metal cutting, which are used to solve the problem that thermal distortion is formed at the cutting edge in the prior art laser cutting, affecting the processing quality.

[0005] The technical solution of the present invention is as follows: A laser cutting machine for sheet metal cutting includes a frame and a laser cutting head. The laser cutting head is movably arranged on the frame through a gantry, and further includes: A workbench, which is fixedly connected to the frame; A water cooling mechanism, which is used to cool the workbench by water cooling. The water cooling mechanism includes: A chiller; A plurality of cold water pipes, which are arranged inside the workbench; An inlet pipe, which is connected to the cold water pipes. An adjustment valve is arranged on the cold water pipe; An outlet pipe, which is connected to the end of the cold water pipe far from the inlet pipe. Both the inlet pipe and the outlet pipe are connected to the chiller; A plurality of sensors, which are installed at the edge of the workbench, used to sense the position of the laser cutting head and control the water supply at the corresponding position. The positions of the sensors correspond to those of the adjustment valves, and the sensors are electrically connected to the adjustment valves; An air cooling mechanism, which is arranged at the laser cutting head and is used to cool the laser cutting position by air cooling. The air cooling mechanism includes: An air-cooled bin, which is fixedly connected to the laser cutting head, and a plurality of air outlet holes are opened at the bottom of the air-cooled bin; A blower, which is installed on the laser cutting head, and the air outlet of the blower is communicated with the air-cooled bin.

[0006] To improve the air-cooling effect, a water-cooling pipe network is arranged inside the air-cooled bin, and the water-cooling pipe network is communicated with the water inlet pipe. A rotary joint is fixedly connected to the gantry, and the rotary joint is communicated with the water-cooling pipe network through a first telescopic hose, and the rotary joint is communicated with the water inlet pipe through a second telescopic hose.

[0007] To further cool the workbench, the water inlet pipe is communicated with a spray pipe, the spray pipe is located below the workbench, and the spray pipe is communicated with a plurality of nozzles for spraying cold water downward on the workbench. A water collecting tank is fixedly connected to the frame, and the water collecting tank is located below the workbench for receiving the sprayed cold water.

[0008] To improve the cooling effect of the cold water pipe on the workbench, the cold water pipe is arranged in a bent shape inside the workbench.

[0009] To promote the air flow below the workbench, a plurality of support blocks are fixedly connected to the frame, and the workbench is fixedly connected to the top of the support blocks.

[0010] A laser cutting process for sheet metal cutting uses the above-mentioned laser cutting machine for sheet metal cutting, and includes the following steps: S1. Fix and clamp the sheet at a suitable position on the workbench, and the gantry drives the laser cutting head to move to the sheet for laser cutting; S2. When the sensor senses that the laser cutting head moves to the corresponding position, it transmits an electrical signal to the controller to control the opening of the regulating valve at the corresponding position, and increases the flow rate of cold water to quickly cool the processing position; S3. The laser cutting head drives the air-cooled bin to move, the blower blows air into the air-cooled bin, the water inlet pipe conveys cold water into the water-cooling pipe network, and the cold air is blown to the cutting position through the air outlet holes; S4. The water inlet pipe conveys cold water to the spray pipe, and sprays cold water on the workbench through the nozzles to further cool the workbench. The water collecting tank receives the cold water and conveys the water back to the chiller for circulating cooling.

[0011] The working principle and beneficial effects of the present invention are as follows: 1. In the present invention, the gantry drives the laser cutting head to move to cut the sheet metal. The sensor senses the positions of the gantry and the laser cutting head, controls the opening of the regulating valve at the corresponding position, and increases the amount of cold water at the cutting position, so as to quickly cool and lower the temperature at the cutting position.

[0012] 2. In the present invention, the laser cutting head drives the air-cooling bin to move, the blower blows cold air into the interior of the air-cooling bin, and at the same time, the water inlet pipe conveys cold water into the interior of the water-cooling pipe network to further cool the interior of the air-cooling bin. The cold air blows around the laser cutting head through the air outlet holes to perform relatively precise air-cooling on the cutting position.

[0013] 3. In the present invention, the water inlet pipe can convey cold water into the interior of the spray pipe, and the cold water is sprayed below the workbench through the nozzles to further cool the workbench by water-cooling. The cold water after spraying falls into the water collection tank for reuse.

[0014] 4. Compared with the laser cutting machine in the prior art, the present invention cools the workbench by water-cooling through the cold water pipe, senses the position of the laser cutting head through the sensor and controls the increase of the cold water flow in the cold water pipe at the corresponding position to perform relatively precise water-cooling on the cutting position of the sheet. At the same time, by conveying cold air into the air-cooling bin moving with the laser cutting head, air-cooling is performed on the cutting area, and cold water is sprayed below the workbench through the spray pipe and the nozzles to further cool the workbench, thereby cooling the sheet on the workbench, especially cooling the cut sheet, reducing the thermal distortion of the cutting edge caused by the high temperature generated by laser cutting, and ensuring the processing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0016] Figure 1 It is a schematic structural diagram of the first perspective of the whole of the present invention; Figure 2 It is a schematic structural diagram of the second perspective of the whole of the present invention; Figure 3 It is a schematic structural diagram of the workbench, support block, water-cooling mechanism and air-cooling mechanism of the present invention; Figure 4 It is a schematic structural diagram of the spray pipe, nozzle, water-cooling mechanism and water-cooling pipe network of the present invention; Figure 5 It is a schematic structural diagram of the air-cooling mechanism of the present invention; Figure 6 For the present invention Figure 1 It is a partially enlarged schematic structural diagram at A in the present invention.

[0017] In the figure: 1. Frame; 2. Laser cutting head; 3. Gantry; 4. Workbench; 5. Support block; 6. Sensor; 7. Spray pipe; 8. Nozzle; 9. Water collection tank; 101. Chiller; 102. Cold water pipe; 103. Water inlet pipe; 104. Water outlet pipe; 105. Adjusting valve; 201. Air-cooled bin; 202. Fan; 203. Water-cooled pipe network; 204. Adapter; 205. Telescopic hose 1; 206. Telescopic hose 2. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figures 1 to 6 As shown, this embodiment proposes a laser cutting machine for sheet metal plate cutting, including a frame 1 and a laser cutting head 2, the laser cutting head 2 is movably arranged on the frame 1 through a gantry 3, and also includes a workbench 4, a water cooling mechanism, a sensor 6 and an air cooling mechanism. The present invention performs water cooling on the workbench 4 through a cold water pipe 102, senses the position of the laser cutting head 2 through the sensor 6 and controls the increase of the cold water flow in the cold water pipe 102 at the corresponding position, and performs more accurate water cooling on the cutting position of the plate. At the same time, cold air is transported to the inside of the air cooling bin 201 that moves with the laser cutting head 2 to cool the cutting area by air, and cold water is sprayed to the bottom of the workbench 4 through the spray pipe 7 and the nozzle 8 to further cool the workbench 4, thereby cooling the plate on the workbench 4, especially cooling the plate after cutting, reducing the thermal distortion of the cutting edge caused by the high temperature generated by laser cutting, and ensuring the processing quality.

[0020] like Figures 1 to 3 As shown, the workbench 4 is fixedly connected to the frame 1. In order to promote the air flow under the workbench 4, a plurality of support blocks 5 are fixedly connected to the frame 1. The workbench 4 is fixedly connected to the top of the support blocks 5. The support blocks 5 are used to create a certain gap between the workbench 4 and the frame 1, so that air can pass from under the workbench 4 to improve the heat dissipation of the workbench 4. The sheet metal plate is fixedly mounted on the workbench 4 through a clamping mechanism, and the laser cutting head 2 is driven to move by the gantry 3. The moving trajectory of the laser cutting head 2 is pre-set through the operating system to accurately cut the sheet metal plate. The movement of the gantry 3 and the laser cutting head 2 is a well-known prior art and is not the main innovation of the present application. It will not be elaborated here and will not affect the understanding of the present application.

[0021] like Figures 1 to 4As shown, the water cooling mechanism is used to cool the workbench 4 by water cooling. The water cooling mechanism includes a chiller 101, a cold water pipe 102, a water inlet pipe 103 and a water outlet pipe 104. There are multiple cold water pipes 102, which are bent and arranged inside the workbench 4. The cold water pipe 102 is communicated with the water inlet pipe 103, and an adjusting valve 105 is arranged on the cold water pipe 102. The water outlet pipe 104 is communicated with one end of the cold water pipe 102 far away from the water inlet pipe 103. Both the water inlet pipe 103 and the water outlet pipe 104 are communicated with the chiller 101. The chiller 101 makes cold water and transports it to the inside of the cold water pipe 102 through the water inlet pipe 103. The cold water in the cold water pipe 102 exchanges heat with the workbench 4 to cool the workbench 4, so as to cool the plate clamped on the workbench 4 and reduce the deformation of the plate after cutting. The cold water pipe 102 is bent and arranged inside the workbench 4, which can extend the residence time of cold water in the cold water pipe 102, that is, within the range of the workbench 4, and better cool the workbench 4. The cold water in the cold water pipe 102 flows back to the inside of the chiller 101 through the water outlet pipe 104 for circulating cooling.

[0022] There are multiple sensors 6, which are installed on the edge of the workbench 4 and used to sense the position of the laser cutting head 2 and control the water supply volume at the corresponding position. The positions of the sensors 6 and the adjusting valve 105 correspond to each other, and the sensors 6 and the adjusting valve 105 are electrically connected. The sensors 6 can be selected from distance sensors, displacement sensors or pressure sensors, which can sense the movement of the gantry 3 or the laser cutting head 2, or the pressure sensor can contact the moving gantry 3 to sense that the gantry 3 moves to the position corresponding to the adjusting valve 105 and the cold water pipe 102. When the sensor 6 senses that the gantry 3 moves to the position corresponding to the cold water pipe 102, it sends an electrical signal to the controller to control the opening of the adjusting valve 105, increase the cold water flow in the cold water pipe 102, so as to improve the cooling effect on this area, that is, the cutting area, cool the plate more accurately, and at the same time reduce the flow of cold water in the non-working area and reduce the work of the chiller 101.

[0023] As Figures 1 to 5As shown in the figure, an air-cooling mechanism is arranged at the laser cutting head 2 for air-cooling and temperature reduction of the laser cutting position. The air-cooling mechanism includes an air-cooling chamber 201 and a blower 202. The air-cooling chamber 201 is fixedly connected to the laser cutting head 2. A plurality of air outlet holes are opened at the bottom of the air-cooling chamber 201. The blower 202 is installed on the laser cutting head 2, and the air outlet of the blower 202 communicates with the air-cooling chamber 201. A water-cooling pipe network 203 is arranged inside the air-cooling chamber 201, and the water-cooling pipe network 203 communicates with the water inlet pipe 103. A rotary joint 204 is fixedly connected to the gantry 3. The rotary joint 204 communicates with the water-cooling pipe network 203 through a first telescopic hose 205, and the rotary joint 204 communicates with the water inlet pipe 103 through a second telescopic hose 206. Part of the cold water flows into the inside of the water-cooling pipe network 203 to reduce the temperature inside the air-cooling chamber 201. The blower 202 blows air into the inside of the air-cooling chamber 201, and the cold water inside the air-cooling chamber 201 is blown downward through the air outlet holes to the laser cutting head 2. The air-cooling chamber 201 moves with the laser cutting head 2, and can accurately air-cool and cool the cut edge position. The telescopic movement of the first telescopic hose 205 and the second telescopic hose 206 can adapt to the movement of the gantry 3 and the laser cutting head 2.

[0024] As Figure 4 shown, to further cool the workbench 4, the water inlet pipe 103 is connected to a spray pipe 7. The spray pipe 7 is located below the workbench 4. The spray pipe 7 is connected to a plurality of nozzles 8 for spraying cold water downward onto the workbench 4. A water collecting tank 9 is fixedly connected to the frame 1. The water collecting tank 9 is located below the workbench 4 for receiving the sprayed cold water. A valve is arranged on the spray pipe 7. A temperature sensor is installed on the workbench 4. When it senses that the temperature of the workbench 4 is too high, it can transmit an electrical signal to the controller to control the valve to open. The cold water is sent into the inside of the spray pipe 7, and the cold water is sprayed onto the lower part of the workbench 4 through the nozzles 8 to further water-cool and cool the workbench 4. The sprayed cold water falls into the inside of the water collecting tank 9, and the water in the water collecting tank 9 can be pumped back into the inside of the chiller 101 for recycling, or can be transported to other positions where water is needed for utilization.

[0025] This embodiment also proposes a laser cutting process for sheet metal plates, using the above-mentioned laser cutting machine for sheet metal plates, including the following steps: S1. Fix and clamp the plate at a suitable position on the workbench 4, and the gantry 3 drives the laser cutting head 2 to move to the plate for laser cutting; S2. The sensor 6 senses that the laser cutting head 2 moves to the corresponding position, transmits an electrical signal to the controller to control the regulating valve 105 at the corresponding position to open, and increases the flow rate of the cold water to quickly cool the processing position; S3. The laser cutting head 2 drives the air-cooling bin 201 to move, the blower 202 sends air into the interior of the air-cooling bin 201, the water inlet pipe 103 conveys cold water into the interior of the water-cooling pipe network 203, and the cold air is blown to the cutting position through the air outlet holes; S4. The water inlet pipe 103 conveys cold water to the spray pipe 7, sprays cold water onto the workbench 4 through the nozzles 8, further cools the workbench 4, and the water collecting tank 9 receives the cold water and conveys the water back to the chiller 101 for circulating cooling.

[0026] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A laser cutting machine for cutting sheet metal plates, comprising a frame (1) and a laser cutting head (2), wherein the laser cutting head (2) is movably arranged on the frame (1) through a gantry (3), and is characterized in that, Further included are: A workbench (4), the workbench (4) being fixedly connected to the frame (1); A water cooling mechanism for water-cooling and cooling the workbench (4); A plurality of sensors (6), the sensors (6) being installed at the edge of the workbench (4) for sensing the position of the laser cutting head (2) and controlling the water supply at the corresponding position; An air cooling mechanism provided at the laser cutting head (2) for air-cooling and cooling the laser cutting position.

2. The laser cutting machine for sheet metal plates according to claim 1, characterized in that, The water cooling mechanism includes: A chiller (101); A plurality of cold water pipes (102) provided inside the workbench (4); An inlet pipe (103), the cold water pipes (102) being communicated with the inlet pipe (103), an adjustment valve (105) being provided on the cold water pipes (102), the positions of the sensors (6) corresponding to those of the adjustment valve (105), and the sensors (6) being electrically connected to the adjustment valve (105); An outlet pipe (104), the outlet pipe (104) being communicated with one end of the cold water pipes (102) away from the inlet pipe (103), and both the inlet pipe (103) and the outlet pipe (104) being communicated with the chiller (101).

3. A laser cutting machine for sheet metal cutting according to claim 2, characterized in that, The air cooling mechanism includes: An air cooling chamber (201) fixedly connected to the laser cutting head (2), and a plurality of air outlet holes being provided at the bottom of the air cooling chamber (201); A fan (202) installed on the laser cutting head (2), and the air outlet of the fan (202) being communicated with the air cooling chamber (201).

4. A laser cutting machine for sheet metal cutting according to claim 3, characterized in that, A water cooling pipe network (203) is provided inside the air cooling chamber (201), and the water cooling pipe network (203) is communicated with the inlet pipe (103).

5. A laser cutting machine for sheet metal cutting according to claim 4, characterized in that, A swivel joint (204) is fixedly connected to the gantry (3), the swivel joint (204) being communicated with the water cooling pipe network (203) through a flexible hose one (205), and the swivel joint (204) being communicated with the inlet pipe (103) through a flexible hose two (206).

6. The laser cutting machine for sheet metal cutting according to claim 5, wherein, The inlet pipe (103) is communicated with a spray pipe (7) located below the workbench (4), and the spray pipe (7) is communicated with a plurality of nozzles (8) for spraying cold water below the workbench (4).

7. A laser cutting machine for sheet metal cutting according to claim 6, characterized in that, A water collecting tank (9) is fixedly connected to the frame (1) and is located below the workbench (4) for receiving the sprayed cold water.

8. A laser cutting machine for sheet metal cutting according to claim 7, characterized in that, The cold water pipes (102) are arranged in a bent shape inside the workbench (4).

9. The laser cutting machine for sheet metal cutting according to claim 8, characterized in that, A plurality of support blocks (5) are fixedly connected to the frame (1), and the workbench (4) is fixedly connected to the top of the support blocks (5).

10. A laser cutting process for sheet metal plates, which uses a laser cutting machine for sheet metal plates described in claim 9, characterized in that, Including the following steps: S1. Fix and clamp the plate at a suitable position on the workbench (4), and the gantry (3) drives the laser cutting head (2) to move to the plate for laser cutting; S2. The sensor (6) senses that the laser cutting head (2) moves to the corresponding position, transmits an electrical signal to the controller to control the opening of the regulating valve (105) at the corresponding position, and increases the flow rate of cold water to rapidly cool the processing position. S3. The laser cutting head (2) drives the air-cooling bin (201) to move, the fan (202) sends air into the interior of the air-cooling bin (201), and the water inlet pipe (103) transports cold water into the interior of the water-cooling pipe network (203), and the cold air is blown to the cutting position through the air outlet holes. S4. The water inlet pipe (103) transports cold water to the spray pipe (7), sprays cold water onto the workbench (4) through the nozzles (8), further cools the workbench (4), and the water collecting tank (9) receives the cold water and transports the water back to the chiller (101) for circulating cooling.

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