Device capable of carrying out aerial fog cooling injection on molded surface of complex part

Abstract

The utility model discloses a device capable of carrying out aerial fog cooling injection on a complex part molded surface, belongs to the technical field of material processing equipment, and is used for carrying out aerial fog cooling injection on the complex part molded surface. According to the technical scheme, an injection shell is a rectangular shell, a pressurizing pump body is fixed to the center of the top face, the lower end of the pressurizing pump body is connected with an aerial fog nozzle, a compressed gas inlet pipeline and a cooling liquid conveying pipeline are installed at the upper end of the pressurizing pump body, an aerial fog injection opening is formed in the center of the bottom face of the injection shell, and the lower end of the aerial fog nozzle is located in the aerial fog injection opening. And two ends of the top surface of the blowing shell are respectively provided with an aerial fog outlet. According to the utility model, the temperature distribution can be regulated and controlled on line according to the target performance requirement of a plate or a part, and the distance between the upper and lower blowing ports is changed to adapt to the complex molded surface of the part, so that the temperature difference in the width direction of the plate or the part can be reduced, and the temperature drop consistency and cooling uniformity are ensured; and the equal-strength injection cooling effect of the upper and lower surfaces can be ensured, and the surface quality of parts is improved.

Description

Technical Field

[0001] The utility model relates to a device which can spray gas mist for cooling the surface of complex parts, and belongs to the technical field of coating hot forming steel processing equipment. Background Art

[0002] In the automobile production process, high-strength hot stamping steel is widely used as a safety structural part of the automobile due to its high strength (tensile strength ≥ 1500MPa). Traditional bare plate hot-formed steel will produce severe oxidation and decarburization during the heating process, and the corrosion resistance of the parts after hot forming cannot be guaranteed. Therefore, a series of coated hot stamping steels have been developed, such as aluminum silicon coating, zinc coating, zinc iron alloy coating, etc. Pure zinc-coated hot stamping steel sheets have developed rapidly in recent years. Due to the high Al content in the zinc liquid, Al and Fe react quickly to first form a continuous and dense Fe2Al5 inhibition layer, which prevents the production of Fe-Zn brittle phases. When the zinc layer is destroyed, the zinc coating can provide cathodic protection for the steel plate. In the actual application of pure zinc hot-formed steel, there are still major process technology bottlenecks that have not been effectively solved. First, after the pure zinc coating is austenitized, the coating contains liquid Zn, which is prone to liquid metal embrittlement (LMIE) cracks during stamping at high temperatures; second, due to the presence of oxides on the surface of the coating, the contact resistance is increased, affecting weldability. In order to solve the above problems, the traditional idea is to use an indirect hot forming process to reduce the applied stress. This process greatly limits the scope of use of galvanized hot-formed steel. In order to solve the surface oxides, the insulation time is often reduced to reduce the thickness of the oxide layer. This control method is not conducive to complete austenitization, and the reduction in insulation time will hinder the full diffusion between iron and zinc, which is not conducive to the formation of α-Fe phase. To solve this problem, the current existing technology mainly focuses on adding a pre-cooling device between conventional hot stamping processes.

[0003] Chinese patent application No. 202111073382.7 discloses "a hot bath forming process for highly corrosion-resistant and easy-to-weld hot-pressed parts". This process uses the technology of uniformly and controllably removing the surface oxide layer by means of bubbles generated between boiling water and hot sheet metal. This technology transfers the heated sheet metal to a boiling water tank, and uses "insulating layer bubbles" to continuously clean the surface of the steel plate, remove oxides such as ZnO, Al2O3 and MnO on the surface, and control the forming temperature of the sheet metal, while forming and quenching in boiling water. However, this technical solution increases the complexity of equipment and control to a certain extent, and also has certain limitations for large and complex parts.

[0004] Another Chinese patent application No. 202111382425.X discloses "a method for hot forming of galvanized sheets to reduce costs and improve production efficiency". This method uses the coolant sprayed from a high-pressure atomizing nozzle to control the liquid zinc and then control the liquid metal from penetrating into the matrix to cause cracks. The cooling devices of this technical solution are all arranged inside the mold. The first-level cooling device sprays the material at the entrance with a long range and a small space. The design space of the entire assembly line is restricted. The second-level cooling device is arranged on the upper and lower mold surfaces of the mold. It is easy for the spray port to be blocked and damaged, and the reliability of the equipment is reduced.

[0005] In actual production use, the above technical solutions are very difficult to process and implement, which will increase production costs. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a device that can perform aerosol cooling and spraying on the surface of complex parts. This aerosol cooling and spraying device can adjust the temperature distribution of the plate or component online according to the target performance requirements, and adapt to the complex surface of the part by changing the spacing between the upper and lower spray ports. It can not only reduce the temperature difference in the width direction of the plate or part and ensure the consistency of temperature drop, but also ensure the equal-intensity spray cooling effect on the upper and lower surfaces, thereby improving the quality of the coating.

[0007] The technical solution to solve the above technical problems is:

[0008] A device for performing aerosol cooling spraying on the surface of a complex part comprises a plurality of spray units, which are sequentially connected in parallel. Each spray unit comprises a spray shell, a pressurizing pump body, an aerosol nozzle, a compressed gas air inlet pipeline, and a cooling liquid delivery pipeline. The spray shell is a rectangular shell, which is composed of a top surface, two side surfaces, two end surfaces, and a bottom surface. The two side surfaces and the two end surfaces are parallel and opposite to each other. The pressurizing pump body is fixed at the center of the top surface, the lower end of the pressurizing pump body is connected to the aerosol nozzle, the upper end of the pressurizing pump body is equipped with a compressed gas air inlet pipeline and a cooling liquid delivery pipeline, the compressed gas air inlet pipeline is connected to the workshop compressed air pipeline, the cooling liquid delivery pipeline is connected to the coolant storage box, an aerosol spray port is arranged at the center of the bottom surface of the spray shell, the lower end of the aerosol nozzle is located in the aerosol spray port, and aerosol discharge ports are arranged at both ends of the top surface of the spray shell.

[0009] The above-mentioned device can perform aerosol cooling spray on the surface of complex parts. Flow valves are respectively installed in the compressed gas inlet pipeline and the cooling liquid delivery pipeline. The aerosol discharge outlets at both ends of the top surface of the spray shell are respectively connected to the air pump, and the diameter of the aerosol spray outlet at the center of the bottom surface of the spray shell is 8-15mm.

[0010] The above-mentioned device can perform aerosol cooling spray on the surface of complex parts, and there are aerosol baffles at the two ends of the lower side of the spray shell, respectively. The upper ends of the two aerosol baffles are respectively connected to the two end surfaces of the spray shell, and the lower parts of the two aerosol baffles are bent toward the center of the spray shell, and the lower ends of the aerosol baffles are opposite to the outer side of the aerosol spray port on the bottom surface of the spray shell.

[0011] The above-mentioned device can perform aerosol cooling spraying on the surface of complex parts, and the side surfaces of the spray shells of the multiple spray units are parallel and opposite to each other, and the outer surface of one side surface of each spray shell has multiple concave vertical trapezoidal grooves, and the multiple trapezoidal grooves are arranged in parallel, and the outer surface of the other side surface has multiple protruding vertical trapezoidal guide rails, and the cross-section of the trapezoidal guide rails matches the cross-section of the trapezoidal grooves, and the multiple trapezoidal grooves of the spray shells of two adjacent spray units are plugged and connected to the trapezoidal guide rails.

[0012] The beneficial effects of the utility model are:

[0013] An aerosol nozzle is installed at the lower end of the pressurized pump body of the utility model. After compressed gas and cooling liquid enter the pressurized pump body through a compressed gas air inlet pipeline and a cooling liquid delivery pipeline, they are sprayed out from the aerosol nozzle to perform aerosol spray cooling on the parts that need to be cooled. The air inlet flow valve and the liquid inlet flow valve can adjust the gas / liquid ratio, adjust the pressure of the secondary pressurized pump body, and adjust the spray intensity; the aerosol discharge ports at both ends of the top surface of the spray shell recover the aerosol; the aerosol baffle can block the diffusion of high-pressure aerosol, control the cooling range, and ensure the cooling effect; multiple spray shells are connected by trapezoidal slides and trapezoidal guide rails. On the one hand, the height can be adjusted so that each group of aerosol spray ports fits the complex surface of the parts to ensure cooling uniformity. On the other hand, the spray device can be expanded to adapt to the surface of large parts.

[0014] The utility model has a simple structure and is easy to use. The temperature distribution of the plate or component can be adjusted online according to the target performance requirements, and the spacing between the upper and lower blowing ports can be changed to adapt to the complex surface of the part. It can not only reduce the temperature difference in the width direction of the plate or part, ensure the consistency of temperature drop and cooling uniformity, but also ensure the equal-intensity blowing cooling effect on the upper and lower surfaces, improve the quality of the coating, and realize the expansion of the blowing device to adapt to the surface of large parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 is a cross-sectional view of a blowing unit;

[0017] Figure 3 It is a schematic diagram of the utility model cooling a flat plate-type part;

[0018] Figure 4 It is a schematic diagram of cooling an S-shaped surface part according to the utility model;

[0019] Figure 5 It is a schematic diagram of cooling a hat beam profile part according to the utility model;

[0020] Figure 6 It is a schematic diagram of the utility model for cooling arc-shaped surface parts;

[0021] Figure 7 It is a top view of the injection shell.

[0022] The markings in the figure are as follows: spray unit 1, spray shell 2, pressurizing pump body 3, aerosol nozzle 4, compressed gas inlet pipeline 5, cooling liquid delivery pipeline 6, aerosol spray port 7, aerosol exhaust port 8, aerosol baffle 9, trapezoidal slide 10, trapezoidal guide rail 11, part 12. DETAILED DESCRIPTION

[0023] Figure 1 It is shown that the utility model is composed of a plurality of blowing units 1, and the plurality of blowing units 1 are connected in parallel in sequence, and two groups of blowing units 1 are respectively located on the upper and lower sides of the plates or parts that need cooling and blowing for cooling and blowing.

[0024] Figure 1 , 7 It is shown that multiple blowing units 1 are connected, and the connection is made by plugging. The sides of the blowing shells 2 of adjacent blowing units 1 are parallel and opposite to each other, and the outer surface of one side of each blowing shell 2 has five concave vertical trapezoidal slides 10, and the five trapezoidal slides 10 are arranged in parallel, and the outer surface of the other side has five protruding vertical trapezoidal guide rails 11, and the cross section of the trapezoidal guide rails 11 matches the cross section of the trapezoidal slides 10, and the five trapezoidal slides 10 and the five trapezoidal guide rails 11 of the blowing shells 2 of two adjacent blowing units 1 are plugged and connected with each other.

[0025] Figure 2 It is shown that each spray unit 1 is composed of a spray shell 2, a pressurizing pump body 3, an aerosol nozzle 4, a compressed gas inlet pipeline 5, a cooling liquid delivery pipeline 6, an aerosol spray port 7, an aerosol exhaust port 8, and an aerosol baffle 9.

[0026] Figure 2 It is shown that the blowing shell 2 is a rectangular shell, and the blowing shell 2 consists of a top surface, two side surfaces, two end surfaces and a bottom surface, and the two side surfaces and the two end surfaces are parallel and opposite to each other.

[0027] Figure 2It is shown that the pressurized pump body 3 is fixed at the center of the top surface. The pressurized pump body 3 can achieve aerosol mixing to ensure that the spraying pressure is adjusted between 0.2 and 1.5 MPa. The upper end of the pressurized pump body 3 is installed with a compressed gas intake pipeline 5 and a cooling liquid delivery pipeline 6. The compressed gas intake pipeline 5 is connected to the workshop compressed air pipeline, and the cooling liquid delivery pipeline 6 is connected to the cooling liquid storage tank. Flow valves are installed in the compressed gas intake pipeline 5 and the cooling liquid delivery pipeline 6 respectively, so that the flow rate can be controlled. Among them, the compressed gas can be selected from air, nitrogen or other inert gases, and the cooling liquid can be selected from water, or an alkaline solution with a certain concentration, such as NaOH, etc.

[0028] Figure 2 It is shown that the lower end of the pressurizing pump body 3 is connected to the aerosol nozzle 4, and an aerosol spray port 7 is provided at the center of the bottom surface of the spray shell 2. The lower end of the aerosol nozzle 4 is located in the aerosol spray port 7, and the diameter of the aerosol spray port 7 is 8-15 mm.

[0029] Figure 2 It is shown that both ends of the top surface of the spray shell 2 are provided with aerosol discharge ports 8, which are respectively connected to air pumps. The air pump pressure range is 0.6MPa~30MPa, which can quickly discharge the aerosol in the aerosol discharge ports 8.

[0030] Figure 2 It is shown that there are aerosol baffles 9 at both ends of the lower side of the spray shell 2, the upper ends of the two aerosol baffles 9 are respectively connected to the two end surfaces of the spray shell 2, the lower parts of the two aerosol baffles 9 are bent toward the center of the spray shell 2, and the lower ends of the aerosol baffles 9 are opposite to the outer side of the aerosol spray port 7 on the bottom surface of the spray shell 2. The aerosol baffles 9 can block the diffusion of high-pressure aerosol, control the cooling range, and ensure the cooling effect.

[0031] Figure 3 , 4 , 5, and 6 show that the steps of using the utility model are as follows:

[0032] Embodiment 1, isothermal cooling of a plate or component, the specific steps are as follows:

[0033] Step 1: heating the galvanized hot-formed steel sheet or the preformed 90% cold stamped component to a complete austenitizing temperature;

[0034] Step 2: According to the surface characteristics of the part 12, the height of each spray unit 1 is adjusted through the trapezoidal slide 10 and the trapezoidal guide rail 11 to ensure that the aerosol spray port 7 fits the surface of the part 12 and the spraying interval is consistent;

[0035] Step three, according to the performance requirements of the target parts, select a suitable cooling medium, adjust the flow valves of the compressed gas inlet pipe 5 and the cooling liquid delivery pipe 6 respectively to achieve a certain gas / liquid ratio, adjust the pressure of the secondary pressurization pump body 3, and adjust the spraying intensity.

[0036] Step 4: Using a robot to transfer the part 12 at the austenitizing temperature from the heating furnace to the aerosol spraying device, and turning on the spraying unit 1, so that the aerosol spraying port 7 can rapidly cool the plate or part with equal intensity;

[0037] Step 5, turn on the air pump connected to the aerosol outlet 8, and use the aerosol baffle 9 to spray the aerosol splashed on the surface of the steel plate into the housing 2 through the aerosol outlet 8, and then discharge it from the aerosol outlet 8;

[0038] Step six, quickly transfer the pre-cooled plate or part 12 to a hot stamping die for forming quenching.

[0039] Embodiment 2, differential cooling of a plate or component, the specific steps are as follows:

[0040] Step 1: heating the galvanized hot-formed steel sheet or the preformed 90% cold stamped component to a complete austenitizing temperature;

[0041] Step 2: According to the surface characteristics of the parts, the height of each spray unit 1 is adjusted through the trapezoidal slide 10 and the trapezoidal guide rail 11 to ensure that the aerosol spray port 7 fits the surface of the parts 12 and the spraying interval is consistent;

[0042] Step 3: According to the performance requirements of the target part 12, select a suitable cooling medium, adjust the flow valves of the compressed gas inlet pipe 5 and the cooling liquid delivery pipeline 6 respectively to achieve a certain gas / liquid ratio, adjust the pressure of the secondary pressurizing pump body 3, and adjust the spraying intensity;

[0043] Step 4: Use the manipulator to transfer the part 12 at the austenitizing temperature from the heating furnace to the aerosol spraying device, turn on the spraying unit 1, adjust the pressure, flow rate, spraying height of different spraying units 1, and the feeding speed of the manipulator, so that the cooling rate in the target area of ​​the high-temperature plate or component is different, and the temperature difference is achieved. Rapid cooling, ultimately ensure that the temperature difference range of each zone is ≤ 200 ° C;

[0044] Step 5, turn on the air pump connected to the aerosol outlet 8, and use the aerosol baffle 9 to spray the aerosol splashed on the surface of the steel plate into the housing 2 through the aerosol outlet 8, and then discharge it from the aerosol outlet 8;

[0045] Step six, quickly transfer the pre-cooled plate or part 12 to a hot stamping die for forming quenching.

[0046] An embodiment of the spray unit 1 of the utility model is as follows:

[0047] The length of the spray housing 2 is 600 mm, the width is 80 mm, and the height is 180 mm;

[0048] The diameter of the aerosol nozzle 4 is 30 mm and the length is 150 mm;

[0049] The diameter of the compressed gas inlet pipeline 5 is 60 mm and the length is 50 mm;

[0050] The cooling liquid delivery pipeline 6 has a diameter of 12 mm and a length of 75 mm;

[0051] The length of the aerosol spray port 7 is 70mm and the width is 70mm;

[0052] The diameter of the aerosol discharge port 8 is 60 mm and the length is 50 mm;

[0053] The length of the aerosol baffle 9 is 150 mm and the width is 80 mm;

[0054] The upper bottom length of the trapezoidal slide 10 is 7.2 mm, the lower bottom length is 12.5 mm, and the height is 4.5 mm;

[0055] The upper base length of the trapezoidal slider 11 is 12 mm, the lower base length is 6 mm, and the height is 4.3 mm.

Claims

1. A device capable of spraying aerosol cooling on the surface of complex parts, characterized in that: The invention comprises a plurality of spray units (1), wherein the plurality of spray units (1) are connected in parallel in sequence, and each spray unit (1) comprises a spray shell (2), a pressurizing pump body (3), an aerosol nozzle (4), a compressed gas inlet pipeline (5), and a cooling liquid delivery pipeline (6). The spray shell (2) is a rectangular shell, and the spray shell (2) comprises a top surface, two side surfaces, two end surfaces, and a bottom surface. The two side surfaces and the two end surfaces are parallel to each other. The pressurizing pump body (3) is fixed at the center of the top surface. The pressurizing pump body (3) The lower end of the spray shell (2) is connected to the aerosol nozzle (4), the upper end of the pressurizing pump body (3) is equipped with a compressed gas intake pipeline (5) and a cooling liquid delivery pipeline (6), the compressed gas intake pipeline (5) is connected to the workshop compressed air pipeline, the cooling liquid delivery pipeline (6) is connected to the cooling liquid storage box, an aerosol spray port (7) is provided at the center of the bottom surface of the spray shell (2), the lower end of the aerosol nozzle (4) is located in the aerosol spray port (7), and aerosol discharge ports (8) are provided at both ends of the top surface of the spray shell (2).

2. The device for spraying aerosol cooling on the surface of complex parts according to claim 1 is characterized in that: Flow valves are installed in the compressed gas inlet pipeline (5) and the cooling liquid delivery pipeline (6), respectively. The aerosol discharge ports (8) at both ends of the top surface of the spray shell (2) are connected to the air pump, respectively. The diameter of the aerosol spray port (7) at the center of the bottom surface of the spray shell (2) is 8-15 mm.

3. The device for spraying aerosol cooling on the surface of complex parts according to claim 1 is characterized in that: Aerosol baffles (9) are respectively provided at the two ends of the lower side of the spray shell (2); the upper ends of the two aerosol baffles (9) are respectively connected to the two end surfaces of the spray shell (2); the lower parts of the two aerosol baffles (9) are bent toward the center of the spray shell (2); and the lower ends of the aerosol baffles (9) are opposite to the outer side of the aerosol spray port (7) on the bottom surface of the spray shell (2).

4. The device for spraying aerosol cooling on the surface of complex parts according to claim 1 is characterized in that: The side surfaces of the blowing shells (2) of the plurality of blowing units (1) are parallel to each other, and one side outer surface of each blowing shell (2) has a plurality of concave vertical trapezoidal slide grooves (10), the plurality of trapezoidal slide grooves (10) are arranged in parallel, and the other side outer surface has a plurality of protruding vertical trapezoidal guide rails (11), the cross section of the trapezoidal guide rails (11) matches the cross section of the trapezoidal slide grooves (10), and the plurality of trapezoidal slide grooves (10) and the trapezoidal guide rails (11) of the blowing shells (2) of two adjacent blowing units (1) are plug-connected to each other.

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