CN105817771B

CN105817771B - Laser cutting machine for reflective tape

Info

Publication number: CN105817771B
Application number: CN201610293567.1A
Authority: CN
Inventors: 欧展荣
Original assignee: Foshan Kachun Garment Co ltd
Current assignee: Foshan Kachun Garment Co ltd
Priority date: 2016-05-01
Filing date: 2016-05-01
Publication date: 2020-10-16
Anticipated expiration: 2036-05-01
Also published as: CN105817771A

Abstract

The invention relates to a laser cutting machine for a reflective belt, and belongs to the technical field of laser cutting. The laser cutting machine for the reflective tape of the invention comprises CO₂Laser and method for cooling the CO₂A water cooling device of the laser; the CO is₂An annular metal mesh belt is arranged below the laser, a driven wheel and a driving wheel are arranged at two ends of the annular metal mesh belt, and the driving wheel is driven by a synchronous motor; an air suction bin is arranged below the annular metal mesh belt and is connected with a fan; the method is characterized in that: the CO is₂The laser is stainless steel tube CO₂A laser. The laser cutting machine for the reflective belt has the advantages of long service life, high cutting efficiency, high surface quality of finished products and high yield.

Description

Laser cutting machine for reflective tape

Technical Field

The invention relates to the technical field of laser cutting, in particular to a laser cutting machine for a reflective belt.

Background

The laser cutting is to focus the laser emitted from a laser into a laser beam with high power density through an optical path system. The laser beam irradiates the surface of the workpiece to make the workpiece reach a melting point or a boiling point, and simultaneously, the high-pressure gas coaxial with the laser beam blows away the molten or gasified metal. And finally, the material is cut along with the movement of the relative position of the light beam and the workpiece, so that the cutting purpose is achieved.

The laser cutting processing replaces the traditional mechanical knife with invisible light beams, has the characteristics of high precision, quick and smooth cutting, low processing cost and the like, and can gradually improve or replace the traditional metal cutting process equipment. At present, the laser cutting machine is widely applied to cutting plates such as metal, plastic plates, circuit boards and the like, and when the laser cutting machine is applied to cutting of reflective tape materials, if a conventional glass tube laser is adopted, the service life is short, and continuous production is not facilitated; with additional use of CO₂Lasers also tend to cause oxidation fouling of the metal mesh belt surface, which can result in the surface quality and light reflecting properties of the light reflecting belt material being affected.

Disclosure of Invention

In order to solve the above technical problems in the prior art, an object of the present invention is to provide a laser cutting machine for a reflective tape.

In order to realize the purpose of the invention, the invention adopts the following technical scheme:

a laser cutting machine for a reflective tape comprises CO₂Laser and method for cooling the CO₂A water cooling device of the laser; the CO is₂An annular metal mesh belt is arranged below the laser, a driven wheel and a driving wheel are arranged at two ends of the annular metal mesh belt, and the driving wheel is driven by a synchronous motor; an air suction bin is arranged below the annular metal mesh belt and is connected with a fan; the method is characterized in that: the CO is₂The laser is stainless steel tube CO₂A laser.

The laser cutting machine further comprises a discharging unit and a receiving unit.

Wherein the laser cutting machine further comprises a controller for controlling the synchronous motor and the CO₂A controller for the laser.

Wherein the material receiving unit comprises a finished product collector, a waste collector and a waste discharger which are connected with the motor.

Wherein the stainless steel pipe CO₂The laser comprises a sealed stainless steel tube serving as a cathode and an outer shell; a total reflection mirror base is brazed at one end of the sealed stainless steel pipe, and a total reflection mirror is arranged on the total reflection mirror base; an exit mirror base is brazed at the other end of the sealed stainless steel pipe, and an exit mirror is arranged on the exit mirror base; an inner discharging tube is coaxially arranged in the sealed stainless steel tube, and a discharging electrode is arranged on the inner discharging tube.

The stainless steel pipe is provided with double-layer inner walls, and a water-cooling interlayer is arranged between the inner walls; the inner discharge tube is provided with double-layer inner walls, and a water-cooling interlayer is arranged between the inner walls.

Wherein the stainless steel pipe CO₂The power of the laser is 100-500W, preferably 200W.

Wherein the metal mesh belt is a cast iron mesh belt, and the cast iron mesh belt comprises 3.1-3.8 wt% of C, 2.5-3.5 wt% of Si, 0-0.8 wt% of Mn, 0.02-0.10 wt% of Mo, 0.60-1.0 wt% of Cu, 0.05-0.15 wt% of Ti, 0.01-0.05 wt% of Zr, 0.02-0.05 wt% of Mg, less than 0.10 wt% of P, less than 0.05 wt% of S, and the balance of Fe and inevitable impurities.

The cast iron mesh belt is subjected to plasma modification treatment in a vacuum chamber, the molar ratio of [ N ]/[ O ] at a distance range of 5 mu m from the surface after the surface modification treatment is 2: 1-3: 1, and the molar ratio of [ N ]/[ O ] at a distance of 10 mu m from the surface is less than 1.5: 1.

Compared with the prior art, the laser cutting machine for the reflective belt has the following beneficial effects:

the laser cutting machine for the reflective belt has the advantages of long service life, high cutting efficiency, high surface quality of finished products and high yield.

Drawings

Fig. 1 is a schematic structural view of a laser cutter for a reflective tape of the present invention.

Detailed Description

The laser cutting machine for the reflective tape of the present invention will be further described with reference to the following embodiments to help those skilled in the art to more fully, accurately and deeply understand the inventive concept and technical solution of the present invention.

As shown in fig. 1, the laser cutting machine for a reflective tape of the present embodiment includes a discharge unit 2, a cutting unit 1, and a receiving unit 3. The cutting unit 1 comprises CO₂Laser 13 and method for cooling the CO₂Water cooling means 12 for the laser 13. The CO is₂An annular metal mesh belt 17 is arranged below the laser 13, a driven wheel 18 and a driving wheel 19 are arranged at two ends of the annular metal mesh belt 17, the driving wheel 19 is driven by a synchronous motor 14, and the driven wheel 18 and the driving wheel 19 are installed on the fixed support 10. An air suction bin 15 is arranged below the annular metal mesh belt 17, and the air suction bin 15 is connected with a fan 16. The laser cutting machine further comprises a controller for controlling the synchronous motor and the CO₂A controller for the laser. The receiving unit 3 comprises a product collector 32 connected to a motor 31, a waste collector 33 and a waste discharger 34. In this embodiment, the operation of the synchronous motor 14 rotates the driving wheel 19, so that the metal mesh belt 17 rotates around the driven wheel 18 and the driving wheel 19, and the rotation speed of the metal mesh belt can be controlled by the controller to be in contact with CO₂The cutting operation of the laser is synchronous; when the fan 16 works, negative pressure is generated in the air suction bin 15, and the belt to be reflected on the metal mesh belt 17 is adsorbed.

In this example, the stainless steel tube CO₂The laser comprises a sealed stainless steel tube serving as a cathode and an outer shell; a total reflection mirror base is brazed at one end of the sealed stainless steel pipe, and a total reflection mirror is arranged on the total reflection mirror base; an exit mirror base is brazed at the other end of the sealed stainless steel pipe, and an exit mirror is arranged on the exit mirror base; an inner discharging tube is coaxially arranged in the sealed stainless steel tube, and a discharging electrode is arranged on the inner discharging tube. The stainless steel pipe is provided with double-layer inner walls, and a water-cooling interlayer is arranged between the inner walls; the inner discharge tube is provided with double-layer inner walls, and a water-cooling interlayer is arranged between the inner walls. The stainless steel pipe CO₂The power of the laser is 100-500W, preferably 200W. Adopt stainless steel material not only can improve mechanical strength as the shell in this embodiment, be favorable to the heat dissipation moreover, can improve work efficiency.

In this embodiment, the metal mesh belt needs to have both good tensile strength and toughness, and the surface needs to have both high hardness and heat resistance, so as to improve the service life of the metal mesh belt and improve the surface quality of the reflective belt. In addition, the surface of the reflective tape needs a certain surface roughness in order to prevent the reflective tape from slipping. The metal mesh belt is preferably a cast iron mesh belt from the viewpoint of economy. Specifically, the cast iron mesh belt comprises 3.1-3.8 wt% of C, 2.5-3.5 wt% of Si, 0-0.8 wt% of Mn, 0.02-0.10 wt% of Mo, 0.60-1.0 wt% of Cu, 0.05-0.15 wt% of Ti, 0.01-0.05 wt% of Zr, 0.02-0.05 wt% of Mg, less than 0.10 wt% of P, less than 0.05 wt% of S, and the balance of Fe and inevitable impurities. The content of Mo is preferably 0.02 to 0.08 wt% of Mo. In this example, C is an important element for forming graphite cast iron, and it is advantageous to have C content in the range of 3.1-3.8 wt% to achieve both tensile strength and ductility, and if C content exceeds 3.8 wt%, it will result in a decrease in plasticity and workability, and if C content is less than 3.1 wt%, it will result in insufficient strength. The addition of Si is not only necessary for the formation of spheroidal graphite cast iron, but is also advantageous for improving the heat resistance and oxidation resistance of spheroidal graphite cast iron. When the content of Si is less than 2.5 wt%, it results in a significant decrease in heat resistance and oxidation resistance of cast iron, and when the content of Si exceeds 3.5 wt%, the ferrite phase of the matrix becomes brittle, resulting in deterioration of ductility. Mn is an effective element for sulfur removal, but if it is added in an amount exceeding 0.8 wt%, it may affect the toughness of cast iron. Although Mo can significantly improve oxidation resistance and effectively increase strength, the addition of Mo results in a significant reduction in workability and also in a reduction in ductility. Therefore, the amount of Mo added in this example is strictly limited to 0.10 wt% or less, preferably 0.08 wt% or less; in order to improve the strength and the high temperature resistance, the alloy contains 0.60-1.0 wt% of Cu, 0.05-0.15 wt% of Ti and 0.01-0.05 wt% of Zr, especially when the weight percentage of Cu, Ti and Zr is satisfied: when the ratio [ Cu ]/([ Ti ] +2[ Zr ]) is not less than 4.2 and not more than 5.0, not only good heat resistance and oxidation resistance can be obtained, but also high strength and good workability can be obtained. P and S are impurity elements in cast iron, and brittle fracture easily occurs when the content of P exceeds 0.1 wt%, and brittle fracture easily occurs due to thermal stress when the content of S exceeds 0.05 wt%. Illustratively, the prepared raw materials are smelted by using a medium-frequency induction furnace, the smelting temperature is 1500-1550 ℃, a nodulizer (Fe-Si-Mg alloy) is placed at the bottom of a ladle, molten iron is subjected to spheroidization by convection, and the spheroidization time is preferably 3-5 minutes; and (3) preserving the heat of the cast iron obtained after casting in a furnace at the temperature of 720-850 ℃ for 2.0-3.0 hours, then cooling the furnace to the temperature of 500-600 ℃, preserving the heat for 8.0-10.0 hours, and cooling the cast iron to the room temperature in air. The composition of spheroidal graphite cast iron is given below as an example and a comparative example, as shown in table 1.

TABLE 1% by weight

	C	Si	Mn	Mo	Cu	Ti	Zr	Mg	P	S	Cr
												Example 1	3.11	3.27	0.59	0.08	0.95	0.10	0.02	0.03	0.035	0.005	-
Example 2	3.32	3.12	0.67	0.05	0.88	0.10	0.04	0.03	0.032	0.012	-
												Example 3	3.59	3.42	0.72	0.06	0.82	0.12	0.03	0.03	0.028	0.008	-
Example 4	3.71	2.81	0.49	0.06	0.85	0.12	0.03	0.03	0.030	0.008	-
												Comparative example 1	3.32	3.12	0.68	0.05	0.88	0.18	-	0.03	0.030	0.010	-
Comparative example 2	3.59	3.41	0.72	0.06	0.82	-	0.09	0.03	0.025	0.005	-
												Comparative example 3	3.58	3.42	0.72	0.06	-	0.12	0.03	0.03	0.028	0.008	0.85
Comparative example 4	3.32	3.12	0.67	0.05	0.88	0.05	0.04	0.03	0.032	0.010	-
												Comparative example 5	3.32	3.12	0.67	0.05	0.88	0.15	0.06	0.03	0.032	0.010	-

The tensile strength (MPa) and elongation (%) of the cast iron samples obtained in examples 1 to 4 and comparative examples 1 to 5 were measured at room temperature, and the results of the above measurements are shown in Table 2.

TABLE 2

In order to improve the wear resistance and oxidation resistance of the surface of the cast iron mesh belt, the cast iron mesh belt needs to be further subjected to a surface modification treatment. Preferably, the cast iron mesh belt is subjected to plasma treatment in a vacuum chamber, the temperature of the plasma treatment is 150-350 ℃, the plasma power is 2.5kW, and O is₂The flow rate is 15-20 sccm, N₂The flow rate is 30-50 sccm, the treatment time is 25-30 min, and the distance between the surface and the surface is 5 μm after the surface modification treatment [ N]/[O]In a molar ratio of 2: 1 to 3: 1, at a distance of 10 μm from the surface [ N]/[O]The molar ratio of (A) to (B) is 1.5: 1 or less. The HRC hardness after the modification treatment can reach 49-52, and the surface roughness is 1.0-2.0 μm. If only nitriding or oxygen permeation treatment is carried out, the surface hardness can only reach 40-45. In addition, if at a distance of 10 μm from the surface [ N ]]/[O]When the molar ratio of (2) is more than 1.5: 1, the thermal oxidation resistance of the cast iron mesh belt is drastically reduced (as a result, the weight gain of the cast iron sample is remarkably increased when it is kept in an air condition at 1000 ℃ for 24 hours).

It is obvious to those skilled in the art that the present invention is not limited to the above embodiments, and it is within the scope of the present invention to adopt various insubstantial modifications of the method concept and technical scheme of the present invention, or to directly apply the concept and technical scheme of the present invention to other occasions without modification.

Claims

1. A laser cutting machine for a reflective tape comprises CO₂Laser and method for cooling the CO₂A water cooling device of the laser; the CO is₂An annular metal mesh belt is arranged below the laser, a driven wheel and a driving wheel are arranged at two ends of the annular metal mesh belt, and the driving wheel is driven by a synchronous motor; an air suction bin is arranged below the annular metal mesh belt and is connected with a fan; the method is characterized in that: the CO is₂The laser is stainless steel tube CO₂Laser, stainless steel tube CO₂The power of the laser is 100-500W; the metal mesh belt is a cast iron mesh belt, the cast iron mesh belt is subjected to plasma modification treatment in a vacuum chamber, and the position N is 5 mu m away from the surface after the surface modification treatment]/[O]In a molar ratio of 2: 1 to 3: 1, at a distance of 10 μm from the surface [ N]/[O]The molar ratio of (A) to (B) is 1.5: 1 or less.

2. The laser cutting machine for a reflective tape according to claim 1, characterized in that: the device also comprises a discharging unit and a receiving unit.

3. The laser cutting machine for a reflective tape according to claim 1, characterized in that: the laser cutting machine further comprises a controller for controlling the synchronous motor and the CO₂A controller for the laser.

4. The laser cutting machine for a reflective tape according to claim 2, characterized in that: the material receiving unit comprises a finished product collector, a waste material collector and a waste material discharger which are connected with the motor.

5. The laser cutting machine for a reflective tape according to claim 1, characterized in that: the stainless steel pipe CO₂The laser comprises a sealed stainless steel tube serving as a cathode and an outer shell; a total reflection mirror base is brazed at one end of the sealed stainless steel pipe, and a total reflection mirror is arranged on the total reflection mirror base; an exit mirror base is brazed at the other end of the sealed stainless steel pipe, and an exit mirror is arranged on the exit mirror base; an inner discharging tube is coaxially arranged in the sealed stainless steel tube, and a discharging electrode is arranged on the inner discharging tube; the stainless steel pipe is provided with double-layer inner walls, and a water-cooling interlayer is arranged between the double-layer inner walls of the stainless steel pipe; the inner discharge tube is provided with double-layer inner walls, and a water-cooling interlayer is arranged between the double-layer inner walls of the inner discharge tube.

6. The laser cutting machine for a reflective tape according to claim 1, characterized in that: the cast iron mesh belt comprises 3.1-3.8 wt% of C, 2.5-3.5 wt% of Si, 0-0.8 wt% of Mn, 0.02-0.10 wt% of Mo, 0.60-1.0 wt% of Cu, 0.05-0.15 wt% of Ti, 0.01-0.05 wt% of Zr, 0.02-0.05 wt% of Mg, less than 0.10 wt% of P, less than 0.05 wt% of S, and the balance of Fe and inevitable impurities.