Milling device and method of metal plate manufacturing equipment

Abstract

The invention discloses a milling device and method for metal plate manufacturing equipment, the milling device comprises a milling machine, a low-temperature phase change positioning mechanism is mounted on the milling machine, the low-temperature phase change positioning mechanism comprises a positioning table, a plurality of flow guide grooves are uniformly formed in the top surface of the positioning table, and a heatable supporting strip is fixedly arranged between every two flow guide grooves; the positioning table is provided with two airflow sealing guide assemblies with an adjustable distance; and two rubber strips are mounted on the opposite side walls of the two airflow sealing guide assemblies. Through a low-temperature phase change clamping technology, the zero-stress fixed workpiece is adsorbed by an ice layer and is in a low-temperature brittle state, so that the internal stress is synchronously released along with material cutting in the milling process, and the springback deformation after machining is completely eliminated from the source.

Description

Technical Field

[0001] This invention relates to the field of machining technology, and in particular to a milling apparatus and method for manufacturing metal plates. Background Technology

[0002] When milling metal sheets, especially thin-walled sheets, traditional clamping methods commonly use mechanical clamps, flat-jaw vises, etc., to hold the workpiece. These methods share a common drawback: the clamping force causes elastic deformation and stress concentration in the sheet. After machining, the release of the clamping force leads to springback deformation due to the release of residual stress inside the workpiece, severely affecting machining accuracy. Studies have shown that under point-support clamping, thin sheets are subjected to the combined effects of cutting force, cutting heat, and clamping force. The release of residual stress after machining causes workpiece deformation, and the coupling relationship of these complex factors makes it difficult to control machining deformation.

[0003] Therefore, how to reliably fix the plate under zero clamping stress and simultaneously utilize low temperature conditions to improve cutting and promote internal stress release is a technical problem that urgently needs to be solved in this field. Therefore, we propose a milling device and method for metal plate manufacturing equipment. Summary of the Invention

[0004] To address the problems of elastic deformation of sheet metal caused by the clamping force of existing mechanical clamping and springback deformation caused by the release of residual stress after processing, the present invention aims to provide a milling device and method for metal sheet metal manufacturing equipment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a milling device for manufacturing metal plates, comprising a milling machine, a low-temperature phase change positioning mechanism mounted on the milling machine, the low-temperature phase change positioning mechanism comprising a positioning table, a plurality of evenly arranged guide grooves being formed on the top surface of the positioning table, a heatable support strip being fixedly arranged between every two guide grooves, and two airflow sealing guide components with adjustable spacing being mounted on the positioning table; two rubber strips are mounted on the opposing sidewalls of the two airflow sealing guide components for fitting against the sidewalls of the metal plate to prevent gas from escaping from the airflow sealing guide components; One of the airflow sealing guide components is connected to the cold nitrogen supply unit and is used to introduce cold nitrogen into several guide channels. The other airflow sealing guide component is connected to the nitrogen recovery unit and is used to draw and recover the nitrogen after it flows through the guide channel under negative pressure.

[0006] Preferably, the side wall of the positioning platform has several countersunk holes located below several guide channels. The countersunk holes and guide channels are orthogonally arranged. Several guide holes are vertically formed at the bottom of the guide channels. Piston grooves that communicate with each other are formed between the guide holes and the countersunk holes. A lifting rod is slidably sleeved on the inner wall of the guide hole. A piston that is slidably sleeved on the inner wall of the piston groove is fixedly connected to the bottom of the lifting rod. The top surface of the piston and the end face of the piston groove and the connection point are in a stop fit. Hydraulic oil is filled in the countersunk holes and the piston groove located below the piston. A control valve is connected to the port of the guide channel. The control valve is connected to a hydraulic oil injection pump. The piston and lifting rod are driven to rise and fall by the injection of hydraulic oil. After the lifting rod rises vertically, it can turbulent the flowing gas and enhance the cooling effect of the cold nitrogen.

[0007] Preferably, the heatable support strip is made of thermally conductive metal, and an electric heating rod is embedded inside the heatable support strip.

[0008] Preferably, the airflow sealing guide assembly includes a rectangular housing with an open bottom, the bottom end face of the rectangular housing being slidably sealed to the top surface of all the heatable support bars, guide adjustment assemblies being installed at both ends of the rectangular housing, and several adjustment valve assemblies being installed on its side walls for opening and closing the passage of the guide groove below the rectangular housing; and an interface communicating with its interior being installed at the top of the rectangular housing.

[0009] Preferably, the guide adjustment assembly includes two rectangular blocks fixedly installed at both ends of a rectangular housing. A crossbar is slidably connected to the side wall of one of the rectangular blocks, and two first mounting blocks are fixedly connected to both ends of the crossbar. The two first mounting blocks are fixedly installed on the side wall of the positioning stage. A lead screw is threaded through the side wall of the other rectangular block. One end of the lead screw is rotatably connected to a second mounting block fixedly installed on the side wall of the positioning stage, and the other end is axially connected to a first motor fixedly installed on the side wall of the positioning stage. The first motor drives the two guide adjustment assemblies to move towards each other and away from each other through the lead screw.

[0010] Preferably, the regulating valve assembly includes a second motor fixedly mounted on the side wall of the rectangular housing. The output end of the second motor is shaft-connected to a threaded rod. A baffle is fixedly connected to the end of the threaded rod away from the second motor. A connecting plate is threaded through the outer wall of the threaded rod. A slider is fixedly mounted on the side wall of the connecting plate near the bottom. The outer wall of the bottom of the slider is in sliding seal connection with the inner wall of the guide groove. The side wall of the slider is in sliding seal connection with the side wall of the heatable support bar. The top surface of the slider is in sliding seal connection with the end face of the bottom of the rectangular housing. When the top surface of the slider is in contact with the end faces on both sides of the opening of the rectangular housing, it is used to block the gas in the rectangular housing from flowing out of the guide groove where the slider is located, so as to adapt to the positioning of metal plates of different widths.

[0011] Preferably, the sidewall of the rubber strip is fixedly connected to the sidewall of the rectangular shell, and the bottom surface of the rubber strip is slidably sealed to the top surface of the heatable support strip.

[0012] A method of using a milling device for manufacturing metal sheets includes the following steps: S1, place the metal plate on the positioning platform, and move the two airflow sealing guide components toward each other to tightly fit the two rubber strips against the side wall of the metal plate; S2, start the cold nitrogen supply unit to introduce cold nitrogen into each guide channel through an airflow sealing guide component; start the nitrogen recovery unit to draw back the cold nitrogen after it has flowed through the guide channel under negative pressure through another airflow sealing guide component, forming a closed-loop circulation circuit; When the temperature of the top surface of the positioning platform is lower than the ambient dew point temperature, water vapor between the top surface of the positioning platform and the bottom surface of the metal plate condenses to form an ice layer, which fixes the metal plate to the top surface of the positioning platform. S3, start the milling machine to mill the metal plate; S4. After the milling process is completed, turn off the cold nitrogen supply unit and stop the supply of cold nitrogen; turn on the heating support bar to raise the temperature of the top surface of the positioning table above the freezing point, melt the ice layer, and release the metal plate from the fixation.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: 1. This invention utilizes low-temperature phase change clamping to fix the workpiece by adsorbing it with ice and keeping it in a brittle state. This achieves simultaneous release of internal stress during cutting with zero clamping force, eliminating springback deformation at its source and greatly reducing the surface roughness of milling.

[0014] 2. This invention achieves efficient and uniform cooling of cold nitrogen gas through closed-loop cold nitrogen gas flow and a liftable turbulence structure, which greatly improves utilization and reduces operating costs.

[0015] 3. This invention uses a low-temperature phase transformation to put the metal plate into a brittle state, realizing the transformation of the chip from a tough, curled shape to a brittle, broken shape. The waste chips are short fragments without breaking into long strips, effectively avoiding the chips from entangled in the tool and workpiece, and greatly reducing the difficulty of cleaning.

[0016] 4. This invention achieves rapid melting and positioning of the ice layer by heating the heatable support strip after processing, thus solving the problem of the workpiece being difficult to remove after clamping. Attached Figure Description

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the overall front view of the present invention; Figure 2This is a schematic diagram of the overall structure of the positioning platform of the present invention; Figure 3 This is a cross-sectional structural schematic diagram of the positioning stage of the present invention; Figure 4 This is a schematic diagram of the structure of the guide adjustment component of the present invention; Figure 5 This is a schematic diagram of the regulating valve assembly of the present invention.

[0018] In the diagram: 100, Milling machine; 200, Low-temperature phase change positioning mechanism; 1, Positioning table; 11, Countersunk hole; 12, Piston groove; 13, Lifting rod; 14, Piston; 15, Control valve; 2, Guide groove; 3, Heated support bar; 31, Electric heating rod; 4, Airflow sealing guide assembly; 41, Rectangular housing; 42, Guide adjustment assembly; 421, Rectangular block; 422, Crossbar; 423, First mounting block; 424, Lead screw; 425, Second mounting block; 426, First motor; 43, Adjusting valve assembly; 431, Second motor; 432, Threaded rod; 433, Baffle; 434, Connecting plate; 435, Slider; 44, Interface; 5, Rubber strip. Detailed Implementation

[0019] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0020] Please see Figures 1 to 5 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0021] This invention provides a technical solution: a milling device for manufacturing metal plates, comprising a milling machine 100. A low-temperature phase change positioning mechanism 200 is mounted on the milling machine 100.

[0022] The low-temperature phase change positioning mechanism 200 includes a positioning table 1. The positioning table 1 is fixedly installed on the worktable of the milling machine 100. A plurality of evenly arranged guide grooves 2 are formed on the top surface of the positioning table 1. A heatable support bar 3 is fixedly arranged between every two adjacent guide grooves 2. The top surface of the heatable support bar 3 is higher than the bottom surface of the guide groove 2, and is used to support the metal plate to be processed.

[0023] Two airflow sealing guide assemblies 4 are installed on the positioning platform 1. The two airflow sealing guide assemblies 4 are respectively located on the left and right sides of the positioning platform 1, and the distance between them is adjustable. A rubber strip 5 is installed on the facing side wall of each of the two airflow sealing guide assemblies 4. When the metal plate is placed on the heatable support bar 3, the two rubber strips 5 are attached to the left and right side walls of the metal plate to prevent gas in the airflow sealing guide assemblies 4 from escaping from the sides.

[0024] One of the airflow sealing guide components 4 is connected to an externally installed cold nitrogen supply unit to introduce cold nitrogen into the guide channel 2. The other airflow sealing guide component 4 is connected to a nitrogen recovery unit to draw back the nitrogen flowing through the guide channel 2 under negative pressure, forming a closed-loop circulation circuit.

[0025] The side wall of the positioning platform 1 has several countersunk holes 11. The countersunk holes 11 are located below several guide channels 2, and the countersunk holes 11 and the guide channels 2 are orthogonal. The bottom of the guide channel 2 has several guide holes vertically. Piston grooves 12 that are interconnected are formed between the guide holes and the countersunk holes 11.

[0026] A lifting rod 13 is slidably sleeved on the inner wall of the guide hole, and the lifting rod 13 can be fully retracted into the guide hole; a piston 14 is fixedly connected to the bottom of the lifting rod 13. The piston 14 is slidably sleeved on the inner wall of the piston groove 12. The end face at the connection between the top surface of the piston 14 and the piston groove 12 is in a stop fit to limit the maximum rising height of the piston 14.

[0027] Hydraulic oil is filled in the countersunk hole 11 and the piston groove 12 located below the piston 14. A control valve 15 is connected to the port of the guide groove 2. The control valve 15 is connected to an external hydraulic oil injection pump. The hydraulic oil injection pump drives the piston 14 and the lifting rod 13 to rise and fall by injecting hydraulic oil. When the lifting rod 13 rises vertically, its top extends into the guide groove 2, creating turbulence on the cold nitrogen flowing through the guide groove 2, preventing the cold nitrogen from flowing directly through, thereby enhancing the heat exchange effect between the cold nitrogen and the top surface of the positioning platform 1 and the bottom surface of the metal plate.

[0028] The heatable support strip 3 is made of thermally conductive metal. An electric heating rod 31 is embedded inside the heatable support strip 3. The electric heating rod 31 is electrically connected to an external heating power source. When it is necessary to heat the top surface of the positioning platform 1, the power is turned on to make the electric heating rod 31 heat up. The heat is conducted through the heatable support strip 3 to the top surface of the positioning platform 1, melting the ice layer and releasing the metal plate from its fixation.

[0029] The airflow sealing guide assembly 4 includes a rectangular housing 41 with an open bottom. The bottom end face of the rectangular housing 41 is slidably sealed to the top surface of all the heatable support bars 3. Guide adjustment assemblies 42 are installed at both ends of the rectangular housing 41 to adjust the distance between the two airflow sealing guide assemblies 4. Several regulating valve assemblies 43 are installed on the side wall of the rectangular housing 41 to open and close the passages of each guide groove 2 below the rectangular housing 41. An interface 44 communicating with the interior is installed on the top of the rectangular housing 41. One interface 44 of the airflow sealing guide assembly 4 is connected to a cold nitrogen supply unit, and the other interface 44 of the airflow sealing guide assembly 4 is connected to a nitrogen recovery unit.

[0030] The specific structure of the guide adjustment assembly 42 is as follows: The guide adjustment assembly 42 includes two rectangular blocks 421 fixedly installed at both ends of the rectangular housing 41. A crossbar 422 is slidably connected to the side wall of one of the rectangular blocks 421. Two first mounting blocks 423 are fixedly connected to both ends of the crossbar 422. The two first mounting blocks 423 are fixedly installed on the side wall of the positioning table 1. A lead screw 424 is threaded through the side wall of the other rectangular block 421. One end of the lead screw 424 is rotatably connected to a second mounting block 425 fixedly installed on the side wall of the positioning table 1. The other end of the lead screw 424 is axially connected to a first motor 426 fixedly installed on the side wall of the positioning table 1. The first motor 426 drives the two guide adjustment assemblies 42 to move towards each other or away from each other through the lead screw 424, thereby causing the two airflow sealing guide assemblies 4 to move closer or further away synchronously to adapt to metal plates of different widths.

[0031] The specific structure of the regulating valve assembly 43 is as follows: The regulating valve assembly 43 includes a second motor 431 fixedly mounted on the side wall of the rectangular housing 41. A threaded rod 432 is shaft-connected to the output end of the second motor 431. A baffle 433 is fixedly connected to the end of the threaded rod 432 away from the second motor 431. A connecting plate 434 is threaded through the outer wall of the threaded rod 432. A slider 435 is fixedly mounted on the side wall of the connecting plate 434 near the bottom. The outer wall of the bottom of the slider 435 is in a sliding seal connection with the inner wall of the guide groove 2. The side wall of the slider 435 is in a sliding seal connection with the side wall of the heatable support bar 3. The top surface of the slider 435 is in a sliding seal connection with the end face of the bottom of the rectangular housing 41. When the second motor 431 drives the threaded rod 432 to rotate, the connecting plate 434 drives the slider 435 to move along the length direction of the guide groove 2. When the slider 435 moves to the point where its top surface is in contact with the end faces on both sides of the opening of the rectangular shell 41, the gas in the rectangular shell 41 can be blocked from flowing out of the guide groove 2 where the slider 435 is located, thereby selecting to open the corresponding number of guide grooves 2 according to the actual width of the metal plate.

[0032] The sidewall of the rubber strip 5 is fixedly connected to the sidewall of the rectangular housing 41. The bottom surface of the rubber strip 5 is slidably sealed to the top surface of the heatable support strip 3. When the two airflow sealing guide assemblies 4 move toward each other, the bottom surface of the rubber strip 5 always maintains a slidably sealed contact with the top surface of the heatable support strip 3, ensuring that cold nitrogen does not leak out from the gap between the rubber strip 5 and the heatable support strip 3.

[0033] After the metal plate is placed on the positioning platform 1, the guide grooves 2 on both sides of the metal plate are not covered. The top surface of the slider 435 in these guide grooves needs to be in contact with the end faces on both sides of the opening of the rectangular shell 41 to block the guide groove 2. Meanwhile, the slider 435 in the guide groove 2 below the metal plate needs to be away from the bottom surface of the opening of the rectangular shell 41 near the rubber strip 5 so that the two rectangular shells 41 are connected through the guide groove 2.

[0034] How to use the milling device in this metal sheet manufacturing equipment: Step 1: Place the metal plate on the positioning platform 1, so that the bottom surface of the metal plate contacts the top surface of the heatable support strip 3, and the left and right sides of the metal plate correspond to the positions of the two rubber strips 5 respectively.

[0035] Step 2: Adjust the spacing between the two airflow sealing guide components 4 according to the width of the metal plate: Start the first motor 426, drive the lead screw 424 to rotate, and drive the two airflow sealing guide components 4 to move towards each other or away from each other along the positioning table 1 until the two rubber strips 5 are respectively attached to the left and right side walls of the metal plate; during the movement, the bottom surface of the rubber strip 5 always maintains sliding sealing contact with the top surface of the heatable support strip 3.

[0036] Step 3, selectively block the guide channels 2 not covered by the metal plate: Based on the actual width of the metal plate, determine the guide channels 2 below the area covered by the metal plate and the guide channels 2 on both sides that are not covered; for the guide channels 2 on both sides that are not covered by the metal plate, start the corresponding second motor 431. The second motor 431 drives the threaded rod 432 to rotate, driving the slider 435 to move along the guide channel 2 until the top surface of the slider 435 is in contact with the end faces on both sides of the opening of the rectangular shell 41, blocking the passage of the guide channel 2; for the guide channel 2 located below the metal plate, drive the slider 435 to move to a position away from the rubber strip 5, so that the two rectangular shells 41 are connected to each other through the guide channel 2.

[0037] Step 4, Introduce cold nitrogen and form a closed loop: Start the externally installed cold nitrogen supply unit and nitrogen recovery unit. Cold nitrogen enters the rectangular housing 41 through the interface 44 of one airflow sealing guide component 4, is distributed to the unblocked guide channel 2 through the rectangular housing 41, flows through the guide channel 2 and enters the rectangular housing 41 of another airflow sealing guide component 4, and is then sucked back by the nitrogen recovery unit under negative pressure through its interface 44, forming a closed loop.

[0038] Step 5, raising the lifting rod 13 to generate turbulence: start the externally installed hydraulic oil injection pump, inject hydraulic oil into the counterbore 11 and piston groove 12 through the control valve 15. The hydraulic oil pushes the piston 14 to rise, and the piston 14 drives the lifting rod 13 to rise vertically along the guide hole, so that the top of the lifting rod 13 extends into the guide groove 2, generating turbulence on the flowing cold nitrogen gas, and enhancing the heat exchange effect between the cold nitrogen gas and the top surface of the positioning platform 1 and the bottom surface of the metal plate.

[0039] Step 6, Low-temperature phase change clamping and fixing: Cold nitrogen gas is continuously introduced to gradually reduce the temperature of the top surface of the positioning platform 1. When the temperature of the top surface of the positioning platform 1 is lower than the ambient dew point temperature, water vapor in the air condenses between the top surface of the positioning platform 1 and the bottom surface of the metal plate to form an ice layer. The ice layer fixes the metal plate to the top surface of the positioning platform 1.

[0040] Step 7, Milling: Start the milling module of the milling machine 100 to mill the fixed metal plate; during the processing, cold nitrogen is continuously introduced to maintain the low temperature, and the lifting height of the lifting rod 13 is adjusted by the hydraulic oil injection pump according to the real-time temperature detection signal to dynamically adjust the turbulence intensity.

[0041] Step 8, Thawing and release after processing: Turn off the cold nitrogen supply unit and stop the supply of cold nitrogen; turn on the heating power supply to make the electric heating rod 31 inside the heatable support bar 3 energized and heated. The heat is conducted through the heatable support bar 3 to the top surface of the positioning table 1, so that the temperature of the top surface of the positioning table 1 rises above the freezing point, the ice layer melts, and the metal plate is released from fixation.

[0042] Step 9, Reset the lifting rod 13 and remove the workpiece: Start the hydraulic oil injection pump, and extract hydraulic oil from the counterbore 11 and piston groove 12 through the control valve 15. The piston 14 descends, causing the lifting rod 13 to fully retract into the guide hole; remove the processed metal plate and shut off the nitrogen recovery unit.

[0043] Step 10, device reset: If the next workpiece needs to be processed, repeat steps S1 to S9; if the processing is finished, start the first motor 426 to move the two airflow sealing guide components 4 to the initial position, and turn off all power and air supply.

[0044] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A milling apparatus for manufacturing metal plates, comprising a milling machine (100), characterized in that, The milling machine (100) is equipped with a low-temperature phase change positioning mechanism (200), which includes a positioning table (1). The top surface of the positioning table (1) is provided with a number of evenly arranged guide grooves (2). A heatable support strip (3) is fixedly provided between every two guide grooves (2). The positioning table (1) is equipped with two airflow sealing guide components (4) with adjustable spacing. Two rubber strips (5) are installed on the opposing sidewalls of the two airflow sealing guide components (4) to fit the sidewalls of the metal plate and prevent gas from overflowing from the airflow sealing guide components (4). One of the airflow sealing guide components (4) is connected to the cold nitrogen supply unit and is used to introduce cold nitrogen into several guide channels (2). The other airflow sealing guide component (4) is connected to the nitrogen recovery unit and is used to draw and recover the nitrogen after it flows through the guide channel (2) under negative pressure.

2. The milling device for metal plate manufacturing equipment according to claim 1, characterized in that: The positioning platform (1) has several countersunk holes (11) on its side wall. The countersunk holes (11) are located below several guide channels (2). The countersunk holes (11) and the guide channels (2) are orthogonally arranged. Several guide holes are vertically opened at the bottom of the guide channels (2). Piston grooves (12) are opened between the guide holes and the countersunk holes (11). A lifting rod (13) is slidably sleeved on the inner wall of the guide hole. A piston (14) is fixedly connected to the bottom of the lifting rod (13) and slidably sleeved on the inner wall of the piston groove (12). The top surface of the piston (14) and the piston groove (12) and the end face of the connection are in a blocking fit; the countersunk hole (11) and the piston groove (12) located below the piston (14) are filled with hydraulic oil. The port of the guide groove (2) is connected to a control valve (15). The control valve (15) is connected to a hydraulic oil injection pump. The piston (14) and the lifting rod (13) are driven to rise and fall by the injection of hydraulic oil. After the lifting rod (13) rises vertically, it can turbulent the flowing gas and enhance the cooling effect of the cold nitrogen.

3. The milling device for metal plate manufacturing equipment according to claim 1, characterized in that: The heatable support bar (3) is made of thermally conductive metal, and an electric heating rod (31) is embedded inside the heatable support bar (3).

4. The milling device for metal plate manufacturing equipment according to claim 1, characterized in that: The airflow sealing guide assembly (4) includes a rectangular housing (41) with an open bottom. The bottom end face of the rectangular housing (41) is slidably sealed to the top face of all the heatable support bars (3). Guide adjustment assemblies (42) are installed at both ends of the rectangular housing (41), and several regulating valve assemblies (43) are installed on its side wall for opening and closing the passage of the guide groove (2) below the rectangular housing (41). An interface (44) communicating with its interior is installed on the top of the rectangular housing (41).

5. The milling device for metal plate manufacturing equipment according to claim 4, characterized in that: The guide adjustment assembly (42) includes two rectangular blocks (421) fixedly installed at both ends of a rectangular housing (41). A crossbar (422) is slidably connected to the side wall of one of the rectangular blocks (421). Two first mounting blocks (423) are fixedly connected to both ends of the crossbar (422). The two first mounting blocks (423) are fixedly installed on the side wall of the positioning platform (1). A lead screw (424) is threaded through the side wall of the other rectangular block (421). One end of the lead screw (424) is rotatably connected to a second mounting block (425) fixedly installed on the side wall of the positioning platform (1), and the other end is axially connected to a first motor (426) fixedly installed on the side wall of the positioning platform (1). The first motor (426) drives the two guide adjustment assemblies (42) to move towards each other and away from each other through the lead screw (424).

6. The milling device for metal plate manufacturing equipment according to claim 4, characterized in that: The regulating valve assembly (43) includes a second motor (431) fixedly mounted on the side wall of a rectangular housing (41). The output end of the second motor (431) is shaft-connected to a threaded rod (432). A baffle (433) is fixedly connected to one end of the threaded rod (432) away from the second motor (431). A connecting plate (434) is threaded through the outer wall of the threaded rod (432). A slider (435) is fixedly mounted on the side wall of the connecting plate (434) near the bottom. The bottom of the slider (435) The outer wall of the slider (435) is connected to the inner wall of the guide groove (2) by a sliding seal. The side wall of the slider (435) is connected to the side wall of the heatable support bar (3) by a sliding seal. The top surface of the slider (435) is connected to the bottom end face of the rectangular shell (41) by a sliding seal. When the top surface of the slider (435) is in contact with the end faces on both sides of the opening of the rectangular shell (41), the gas used to seal the rectangular shell (41) flows out from the guide groove (2) where the slider (435) is located, so as to adapt to the positioning of metal plates of different widths.

7. The milling device for metal plate manufacturing equipment according to claim 4, characterized in that: The sidewall of the rubber strip (5) is fixedly connected to the sidewall of the rectangular shell (41), and the bottom surface of the rubber strip (5) is slidably sealed to the top surface of the heatable support strip (3).

8. A method of using a milling device for metal sheet manufacturing equipment, employing the milling device for metal sheet manufacturing equipment as described in any one of claims 1-6, comprising the following steps: S1, place the metal plate on the positioning platform (1), and move the two airflow sealing guide components (4) towards each other to tightly fit the two rubber strips (5) against the side wall of the metal plate; S2, start the cold nitrogen supply unit to introduce cold nitrogen into each guide groove through an airflow sealing guide component (4); start the nitrogen recovery unit to draw back the cold nitrogen after it flows through the guide groove under negative pressure through another airflow sealing guide component (4) to form a closed loop flow circuit; When the temperature of the top surface of the positioning platform (1) is lower than the ambient dew point temperature, the water vapor between the top surface of the positioning platform and the bottom surface of the metal plate condenses to form an ice layer, which fixes the metal plate to the top surface of the positioning platform. S3, start the milling machine (100) to perform milling on the metal plate; S4. After the milling process is completed, the cold nitrogen supply unit is turned off and the cold nitrogen supply is stopped; the heatable support bar (3) is heated by electricity so that the temperature of the top surface of the positioning table rises above the freezing point, the ice melts, and the metal plate is released from fixation.

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