Manufacturing method of laser-induced die-free huffing plate

Abstract

The invention provides a laser-induced dieless blown plate manufacturing method which comprises the following steps: preparing two metal flat plates as an upper plate and a lower plate respectively, and the two metal flat plates have the same shape and are arranged in an attached manner; welding is carried out along the peripheral contours of the upper plate and the lower plate, welding seams are required to be continuous and have no cracks and air holes, but a fluid input port and a fluid output port are not welded; irradiating a high-energy laser beam at a position near a fluid input port on the surface of the upper plate; during laser irradiation, high-pressure gas is introduced from the fluid input port, the fluid output port is blocked, and the pressure of the high-pressure gas is adjusted, so that an expected blowing effect is obtained; irradiation light spots of the high-energy laser beams are made to continuously move from the fluid input port according to a preset pattern track, and the light spots move the pattern track to achieve the expansion effect of the upper plate in sequence; and then laser irradiation is stopped, and introduction of the high-pressure gas is stopped. According to the manufacturing method of the laser-induced die-free blown plate, spot line pre-welding or die rolling is not needed, the working procedures are few and simple, the cost is low, and the production efficiency is high.

Description

Technical Field

[0001] The invention belongs to the technical field of blowing plate manufacturing, and in particular relates to a laser-induced moldless blowing plate manufacturing method. Background Art

[0002] The blown plate is composed of two layers of metal materials. Generally, a double-shell closed structure with gas input and output ports is formed by welding and other methods, connected together to form an integral structure, and pre-welding points are selectively set at several positions or rolled online using a mold. Then high-pressure gas is introduced to cause one of the flexible metal plates to undergo plastic deformation and swell, thereby forming a fluid flow channel. The appearance of the blown plate is usually wavy, and it is most commonly used to manufacture liquid cooling plates. Generally, it is necessary to increase its heat dissipation surface area as much as possible. On the other hand, the aesthetic effect can be improved by designing various pattern fluid channels. The existing pre-welding point lines or mold rolling methods have many processes and high costs, which are not conducive to personalized small-batch production. Summary of the invention

[0003] In view of the deficiencies of the above-mentioned prior art, the present invention provides a method for producing a laser-induced moldless blown plate; the laser-induced moldless blown plate production method does not require pre-welding point lines or mold rolling, has few and simple steps, and is low in cost, and can achieve small-batch production of personalized graphic fluid channels.

[0004] The present invention is achieved through the following technical solutions: A method for manufacturing a laser-induced moldless blown plate comprises the following steps: (1) Prepare two metal plates as the upper plate and the lower plate respectively. The two plates have the same shape and are placed close together. The elongation of the upper plate and the lower plate is required to be greater than 25%, the plasticity of the upper plate is not lower than that of the lower plate, and the strength of the upper plate is not higher than that of the lower plate. (2) at least one fluid inlet and one fluid outlet are arranged between the upper plate and the lower plate, and then welding is performed along the outer peripheral contours of the upper plate and the lower plate. The weld is required to be continuous and free of cracks and pores, but the fluid inlet and the fluid outlet are not welded together, that is, a closed structure of upper and lower plates with fluid inlet and fluid outlet is formed; (3) Irradiate a high-energy laser beam near the fluid inlet on the surface of the upper plate, and adjust the power of the laser beam so that the maximum temperature T in the irradiated area is greater than the melting point temperature T of the upper plate material. 熔 40% but less than 90% of the total volume; while irradiating with laser, high-pressure gas is introduced from the fluid input port, the fluid output port is blocked, and the pressure of the high-pressure gas is adjusted to obtain the expected inflation effect; (4) The irradiation spot of the high-energy laser beam is continuously moved from the fluid input port according to a preset graphic trajectory, so that the light spot movement graphic trajectory realizes the expansion and bulging effect of the upper plate in sequence until the light spot moves to the fluid output port; then the laser irradiation is stopped and the high-pressure gas is stopped from being introduced.

[0005] Furthermore, the thickness of both the upper plate and the lower plate is less than 2 mm.

[0006] Furthermore, in step (3), the shape of the laser spot is circular or rectangular, and the spot size matches the channel width.

[0007] Furthermore, in step (3), the swelling behavior is detected in real time by machine vision, and the air pressure is adjusted accordingly according to the detection result, forming a dynamic closed-loop regulation.

[0008] Furthermore, in step (3), an infrared thermal imager is used to detect the temperature of the light spot position online, and the laser power is adjusted accordingly according to the detected temperature, forming a dynamic closed-loop regulation.

[0009] The present invention has the following beneficial effects: 1. The laser-induced moldless blown plate manufacturing method of the present invention does not require pre-welding point lines or mold rolling, has few and simple processes, low cost and high production efficiency.

[0010] 2. The laser-induced moldless blown plate manufacturing method of the present invention can realize a blown fluid channel of any pattern by only changing the moving trajectory of the laser irradiation spot, which is suitable for small-batch production of personalized pattern fluid channels.

[0011] 3. The laser-induced moldless blown plate manufacturing method of the present invention can obtain different spot irradiation area shapes and temperature field distributions, as well as specific bulge shapes, such as M-shape, by designing different spot shapes and spot energy distributions. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the laser-induced moldless blown sheet manufacturing process. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0014] like Figure 1 As shown, the present invention provides a method for manufacturing a laser-induced moldless blown plate, which specifically includes the following steps: (1) Prepare two metal plates as the upper plate 1 and the lower plate 2, which are of the same shape and are placed close together. The upper plate 1 and the lower plate 2 are required to have good plasticity (elongation greater than 25%), typically stainless steel plates, low-carbon steel plates, etc. The materials of the upper plate 1 and the lower plate 2 can be the same or different. The plasticity of the upper plate 1 is required to be no less than that of the lower plate 2, and the strength of the upper plate 1 is required to be no higher than that of the lower plate 2. The thickness of both is less than 2 mm. Preferably, the thickness of the two can be inconsistent, and the lower plate 2 can be thicker.

[0015] (2) At least one fluid input port 3 and one fluid output port 4 are provided between the upper plate 1 and the lower plate 2, and then welding is performed along the outer peripheral contour of the upper plate 1 and the lower plate 2 (preferably, laser welding is used to ensure airtightness). The weld is required to be continuous and free of cracks and pores, but the fluid input port 3 and the fluid output port 4 should not be welded together, that is, a closed structure of upper and lower plates with the fluid input port 3 and the fluid output port 4 is formed.

[0016] (3) A high-energy laser beam 5 is irradiated near the fluid inlet 3 on the surface of the upper plate 1 (the spot shape can be circular or rectangular, and its spot size should match the flow channel width), and the power of the laser beam is adjusted so that the maximum temperature T of the spot irradiation area is greater than the melting point temperature T of the upper plate material. 熔 40% but less than 90% (i.e. 0.4*T 熔 ≤ T ≤ 0.9*T 熔 ). While laser irradiation is in progress, high-pressure gas is introduced from the fluid input port 3 to block the fluid output port 4. The pressure of the high-pressure gas is finely adjusted to obtain the desired inflation effect. Due to the property that the strength of metal plastic materials decreases with increasing temperature, the area where the laser spot is being irradiated is gradually inflated by the gas pressure, but no obvious inflation occurs in other locations.

[0017] Preferably, a machine vision system can be set up to detect the swelling behavior in real time, and the air pressure can be adjusted accordingly according to the detection result to form a dynamic closed-loop regulation relationship.

[0018] Preferably, a temperature measuring device such as an infrared thermal imager can be used to detect the temperature of the light spot position online, and the laser power can be adjusted accordingly according to the detected temperature to form a dynamic closed-loop adjustment relationship.

[0019] Preferably, different spot shapes and spot energy distributions can be designed to obtain different spot irradiation area shapes and temperature field distributions, and further obtain specific air pressure bulge convex shapes, such as M-shape, etc.; (4) The irradiation spot of the high-energy laser beam 5 is continuously moved from the fluid input port 3 according to a preset graphic trajectory, so that the light spot movement graphic trajectory sequentially realizes the expansion and bulging effect of the upper plate 1 until the light spot moves to the fluid output port 4. Then, the laser irradiation is stopped and the high-pressure gas is stopped.

[0020] Preferably, the moving speed of the light spot can be adjusted as large as possible while ensuring the gas inflation effect, so as to improve the inflation efficiency.

[0021] The present invention can be modified in many ways that are obvious to those skilled in the art, and such modifications are not considered to depart from the scope of the present invention. All such modifications that are obvious to those skilled in the art are intended to be included within the scope of the present claims.

Claims

1. A method for producing a laser-induced moldless blown plate, characterized in that: The steps include: (1) Prepare two metal plates as the upper plate and the lower plate respectively. The two plates have the same shape and are placed close together. The elongation of the upper plate and the lower plate is required to be greater than 25%, the plasticity of the upper plate is not lower than that of the lower plate, and the strength of the upper plate is not higher than that of the lower plate. (2) at least one fluid inlet and one fluid outlet are arranged between the upper plate and the lower plate, and then welding is performed along the outer peripheral contours of the upper plate and the lower plate. The weld is required to be continuous and free of cracks and pores, but the fluid inlet and the fluid outlet are not welded together, that is, a closed structure of upper and lower plates with fluid inlet and fluid outlet is formed; (3) Irradiate a high-energy laser beam near the fluid inlet on the surface of the upper plate, and adjust the power of the laser beam so that the maximum temperature T in the irradiated area is greater than the melting point temperature T of the upper plate material. 熔 40% but less than 90% of the total volume; while irradiating with laser, high-pressure gas is introduced from the fluid input port, the fluid output port is blocked, and the pressure of the high-pressure gas is adjusted to obtain the expected inflation effect; (4) The irradiation spot of the high-energy laser beam is continuously moved from the fluid input port according to a preset graphic trajectory, so that the light spot movement graphic trajectory realizes the expansion and bulging effect of the upper plate in sequence until the light spot moves to the fluid output port; then the laser irradiation is stopped and the high-pressure gas is stopped from being introduced.

2. The method for manufacturing a laser-induced moldless blown sheet according to claim 1, characterized in that: The thickness of both the upper plate and the lower plate is less than 2 mm.

3. The method for manufacturing a laser-induced moldless blown sheet according to claim 1, characterized in that: In step (3), the shape of the laser spot is circular or rectangular, and the spot size matches the flow channel width.

4. The method for manufacturing a laser-induced moldless blown sheet according to claim 1, characterized in that: In step (3), the swelling behavior is detected in real time by machine vision, and the air pressure is adjusted accordingly according to the detection result, forming a dynamic closed-loop regulation.

5. The method for manufacturing a laser-induced moldless blown sheet according to claim 1, characterized in that: In step (3), an infrared thermal imager is used to detect the temperature of the light spot position online, and the laser power is adjusted accordingly according to the detected temperature to form a dynamic closed-loop regulation.

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