Hot stamping device and method for metal machining

Abstract

The invention relates to a hot stamping device and method for metal machining in the field of stamping machining, the hot stamping device comprises a machine shell, an upper frame and a lower frame are arranged in the machine shell, and dual-mode coolers are arranged in the upper frame and the lower frame; through the arrangement of the dual-mode cooler, in a rapid heat dissipation mode, the adjusting electric pole is started to enable the heat conduction steel belt to be attached to the top face of the mold, meanwhile, the driving roller continuously drives the heat conduction steel belt to rotate, heat of the mold is taken away when the heat conduction steel belt makes contact with the mold, and the heat dissipation effect on the mold is achieved; the heat conduction steel belt is attached to the die in a continuous rotating mode, heat dissipation can be continuously conducted on the die, the heat conduction steel belt is suitable for workpieces with the high workpiece heat dissipation speed requirement and the low heat dissipation uniformity requirement, in the constant-speed heat dissipation mode, the heat conduction steel belt is intermittently attached to the die for heat dissipation, synchronous heat dissipation can be conducted on different positions of the die at the same time, and the heat dissipation efficiency is improved. The heat dissipation device is suitable for workpieces with low requirement on heat dissipation speed and high requirement on heat dissipation uniformity.

Description

TECHNICAL FIELD

[0001] The present application relates to a hot stamping device, in particular to a hot stamping device and method for metal processing applied to the field of stamping processing. BACKGROUND

[0002] Hot stamping is an advanced metal processing technology combining forming and quenching, mainly used for processing of ultra-high strength workpieces. The process flow includes heating the plate to above about 900 DEG C to austenitize, then quickly transferring to a cooling die for stamping forming, while the die quickly takes away heat, so that the material completes quenching during forming to form martensite structure, thereby significantly improving the strength (usually up to 1500 MPa or more).

[0003] Chinese patent CN104275415B discloses a cooling water channel structure for hot stamping, which opens a cooling water groove on the forming die plate, and forms a water flow channel by setting a water blocking block, so that the forming die plate is easy to process, and the cooling water groove is convenient to layout on the forming die plate.

[0004] The internal water channel circulation is adopted for the die, the cooling liquid flows from the fixed inlet to the outlet, and the temperature gradually rises along the way, resulting in that the cooling effect is strong near the inlet and weak near the outlet, forming a temperature difference gradient, and further affecting the forming quality of the workpiece. SUMMARY

[0005] In view of the above prior art, the technical problem to be solved by the present application is that the water cooling system of the die mainly adopts the internal water channel circulation mode, and there is a problem of uneven cooling.

[0006] To solve the above problems, the present application provides a hot stamping device for metal processing, which comprises a machine shell, an upper frame and a lower frame are arranged in the machine shell, the upper frame and the lower frame are respectively connected with the inner wall of the machine shell in a sliding manner and a fixed manner, a hydraulic head is fixedly connected to the top end of the machine shell, the output end of the hydraulic head is fixedly connected with the upper frame, the bottom end of the upper frame and the top end of the lower frame are both fixedly connected with a die, double die coolers are arranged in the upper frame and the lower frame, the double die cooler comprises a mounting box, a plurality of drive rollers are rotatably connected to the inner wall of the mounting box, a heat conduction steel belt is rotatably connected between the plurality of drive rollers, a radiator is mounted in the middle of the mounting box and the heat conduction steel belt penetrates through the radiator, an adjusting electric rod is fixedly connected to the inner wall of the heat conduction steel belt, a buckle frame is fixedly connected to the output end of the adjusting electric rod, the two ends of the buckle frame are respectively located at the two ends of the die, a guide roller is rotatably connected to the two ends of the buckle frame, and the guide roller is in transmission connection with the heat conduction steel belt.

[0007] As a further improvement of the present application, the radiator comprises a heat exchange box, two outer transmission rollers and an inner immersion roller are rotatably connected in the heat exchange box, the outer transmission rollers and the inner immersion roller are in transmission connection with the heat conduction steel belt, and the heat exchange box is filled with cooling liquid.

[0008] As a further improvement of the present application, a heat sink and a fan are fixedly connected to the bottom end of the heat exchange box, and the inner immersion roller is located inside the cooling liquid.

[0009] As a further improvement of the present application, two tensioning devices are fixedly connected to the inner wall of the installation box. The two tensioning devices are respectively located on both sides of the buckle frame, and the tensioning devices include long strip frames.

[0010] As another improvement of the present application, a slider is slidably connected inside the long frame, a top rod is fixedly connected between the bottom end of the slider and the bottom end of the long frame, a tensioning roller is fixedly connected to the side wall of the slider, and the heat-conducting steel belt and the tensioning roller are transmission-connected.

[0011] As another improved supplement to the present application, the outer transmission roller, inner immersion roller, drive roller, guide roller and tensioning roller are all composed of support bars, on which multiple rotating drums are mounted, and the rotating drums and the support bars are rotatably connected through bearings. Multiple heat-conducting steel belts are provided, and the width of each heat-conducting steel belt is equal to the width of the rotating drum.

[0012] As another improved supplement of the present application, the driving roller further includes a motor and a ring gear. The motor is fixedly connected to the support bar. The output end of the motor is fixedly connected to a gear, and the ring gear is meshed with the gear.

[0013] A method for using a hot stamping device for metal processing comprises the following steps:

[0014] S1. Heat the workpiece and place it between two molds. Then start the hydraulic head to drive the upper mold to move downward to stamp the workpiece.

[0015] S2. Start the dual-mode cooler to cool the workpiece while stamping;

[0016] S3. The hydraulic head drives the upper die to move upward, removing the workpiece from the die to complete the stamping.

[0017] The dual-mode cooler has a fast heat dissipation mode and a uniform heat dissipation mode. The working method of the fast heat dissipation mode is: start the adjustment rod to drive the buckle frame to move downward so that the heat-conducting steel belt is in contact with the top surface of the mold. At the same time, the driving roller continuously drives the heat-conducting steel belt to rotate. When the heat-conducting steel belt contacts the mold, it takes away the heat of the mold and plays a role in cooling the mold.

[0018] In the rapid heat dissipation mode, the heat-conducting steel belt adheres to the mold through continuous rotation, which can continuously dissipate heat from the mold. It is suitable for workpieces that require high heat dissipation speed but low heat dissipation uniformity.

[0019] The uniform cooling mode works as follows:

[0020] The start-up adjustment rod drives the buckle frame to move up and down reciprocatingly, so that the heat-conducting steel belt is intermittently close to and separated from the mold. At the same time, the drive roller rotates intermittently. When the drive roller stops rotating, the adjustment rod drives the buckle frame to move downward so that the heat-conducting steel belt is close to the mold. At this time, the heat-conducting steel belt absorbs the heat of the mold and plays a role in heat dissipation for the mold. When the drive roller starts to rotate, the adjustment rod drives the buckle frame to move upward to separate the heat-conducting steel belt from the mold.

[0021] In the uniform heat dissipation mode, the heat-conducting steel belt dissipates heat by intermittently contacting the entire mold. It can dissipate heat synchronously at different positions of the mold at the same time. It is suitable for workpieces that do not require high heat dissipation speed but high heat dissipation uniformity.

[0022] In summary, this invention realizes precise temperature control of different areas of the mold through multiple sets of independently controlled heat-conducting steel belt systems. Each heat-conducting steel belt is driven by a separate motor, and the speed can be adjusted in real time according to the heat dissipation requirements of the mold, so that the high-temperature area can obtain faster heat conduction and the heat dissipation of the entire mold is more uniform.

[0023] The dual-mode cooler has two working modes: the continuous mode keeps the stainless steel strip running, which is suitable for thick plate workpieces that need to be cooled quickly; the intermittent mode adjusts the reciprocating motion of the electric rod to make the steel strip and the mold form periodic contact, which is particularly suitable for the processing of complex parts with high requirements for temperature uniformity. It can reduce the cooling speed deviation of various parts of the workpiece and is suitable for the production of high-quality workpieces. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a front cross-sectional view of the housing in the first and second embodiments of the present application;

[0025] Figure 2 This is a front cross-sectional view of the installation box in the first and second embodiments of the present application;

[0026] Figure 3 This is a diagram showing the positional relationship between the heat-conducting steel belt and the mold in the first and second embodiments of the present application;

[0027] Figure 4 This is a three-dimensional diagram of the heat-conducting steel belt in the first and second embodiments of the present application;

[0028] Figure 5 This is a top cross-sectional view of the rotating drum in the first and second embodiments of the present application;

[0029] Figure 6 This is a front cross-sectional view of the long strip frame in the first and second embodiments of the present application;

[0030] Figure 7 This is a flow chart of the method for using the hot stamping device in the second embodiment of the present application.

[0031] Description of the numbers in the figure:

[0032] 1. Casing; 2. Upper frame; 3. Lower frame; 4. Hydraulic head; 5. Mold; 6. Heat exchange box; 601. External drive roller; 602. Internal soaking roller; 603. Heat sink; 604. Fan; 7. Mounting box; 701. Drive roller; 702. Heat-conducting steel belt; 703. Adjusting pole; 704. Buckle frame; 705. Guide roller; 8. Long frame; 801. Slider; 802. Push rod; 803. Tensioning roller; 9. Support bar; 901. Rotating drum; 902. Motor; 903. Gear; 904. Ring gear. DETAILED DESCRIPTION

[0033] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0034] The first implementation method:

[0035] Figures 1-6 A hot stamping device for metal processing is shown, comprising a housing 1, an upper frame 2 and a lower frame 3 are provided inside the housing 1, the upper frame 2 and the lower frame 3 are respectively connected to the inner wall of the housing 1 in a sliding manner and fixedly connected, a hydraulic head 4 is fixedly connected to the top of the housing 1, the output end of the hydraulic head 4 is fixedly connected to the upper frame 2, the bottom end of the upper frame 2 and the top end of the lower frame 3 are fixedly connected to a mold 5, and a dual-mode cooler is provided inside the upper frame 2 and the lower frame 3, and the dual-mode cooler includes a mounting box 7, the inner wall of the mounting box 7 is rotatably connected to the inner wall of the mounting box 7. There are multiple driving rollers 701, and a heat-conducting steel belt 702 is rotatably connected between the multiple driving rollers 701. A radiator is installed in the middle of the installation box 7 and the heat-conducting steel belt 702 passes through the radiator. The inner wall of the heat-conducting steel belt 702 is fixedly connected with an adjusting pole 703, and the output end of the adjusting pole 703 is fixedly connected with a buckle frame 704. The two ends of the buckle frame 704 are respectively located at the two ends of the mold 5. Both ends of the buckle frame 704 are rotatably connected with guide rollers 705, and the guide rollers 705 are transmission-connected to the heat-conducting steel belt 702.

[0036] The radiator includes a heat exchange box 6, which is internally rotatably connected to two external drive rollers 601 and an internal soaking roller 602. The external drive rollers 601 and the internal soaking roller 602 are both transmission-connected to the heat-conducting steel belt 702. The interior of the heat exchange box 6 is filled with coolant, and the bottom end of the heat exchange box 6 is fixedly connected to a heat sink 603 and a fan 604. The internal soaking roller 602 is located inside the coolant.

[0037] Through the above arrangement, when the fan 604 is started, the coolant can be cooled through the heat sink 603 . When the heat-conducting steel belt 702 passes through the coolant, the coolant can absorb the heat of the heat-conducting steel belt 702 and dissipate the heat of the heat-conducting steel belt 702 .

[0038] Two tensioning devices are fixedly connected to the inner wall of the installation box 7, and the two tensioning devices are respectively located on both sides of the buckle frame 704. The tensioning device includes a long frame 8, and a slider 801 is slidably connected inside the long frame 8. A top rod 802 is fixedly connected between the bottom end of the slider 801 and the bottom end of the long frame 8. A tensioning roller 803 is fixedly connected to the side wall of the slider 801, and the heat-conducting steel belt 702 and the tensioning roller 803 are transmission connected.

[0039] Through the above-mentioned arrangement, when the buckle frame 704 moves downward to drive the thermal conductive steel belt 702 to stick to the mold 5, it can drive the tensioning roller 803 to move downward, which can protect the thermal conductive steel belt 702 and prevent the thermal conductive steel belt 702 from breaking when the buckle frame 704 presses down the thermal conductive steel belt 702.

[0040] The outer transmission roller 601, the inner soaking roller 602, the driving roller 701, the guide roller 705 and the tensioning roller 803 are all composed of a support bar 9, on which a plurality of rotating drums 901 are sleeved. The rotating drums 901 and the support bar 9 are rotatably connected through bearings. There are a plurality of heat-conducting steel belts 702, and the width of each heat-conducting steel belt 702 is equal to the width of the rotating drum 901. The driving roller 701 also includes a motor 902 and a ring gear 904. The motor 902 is fixedly connected to the support bar 9, and the output end of the motor 902 is fixedly connected to a gear 903, and the ring gear 904 is engaged with the gear 903.

[0041] The starting motor 902 can drive the rotating drum 901 to rotate through the gear 903 and the ring gear 904. When the rotating drum 901 rotates, it can drive the heat-conducting steel belt 702 to rotate. By setting multiple heat-conducting steel belts 702, the rotation speeds of the multiple heat-conducting steel belts 702 can be controlled separately by multiple motors 902 to maintain different values. When the rotation speed of the heat-conducting steel belt 702 increases, the heat transfer speed of the mold 5 becomes faster. When the rotation speed of the heat-conducting steel belt 702 slows down, the transfer speed of the mold 5 slows down. This allows targeted heat dissipation of different positions of the mold 5, and can be applied to different mold heat dissipation requirements.

[0042] Second implementation method:

[0043] Figures 1-7 A hot stamping device and method for metal processing is shown, comprising the following steps:

[0044] S1. Heat the workpiece and place it between the two molds 5. Then start the hydraulic head 4 to drive the upper mold 5 to move downward to stamp the workpiece.

[0045] S2. Start the dual-mode cooler to cool the workpiece while stamping;

[0046] S3, the hydraulic head 4 drives the upper die 5 to move upward, removes the workpiece from the die and completes the stamping.

[0047] The dual-mode cooler has a fast heat dissipation mode and a uniform heat dissipation mode. The working method of the fast heat dissipation mode is: start the adjustment rod 703 to drive the buckle frame 704 to move downward so that the heat-conducting steel belt 702 is in contact with the top surface of the mold 5. At the same time, the driving roller 701 continuously drives the heat-conducting steel belt 702 to rotate. When the heat-conducting steel belt 702 contacts the mold 5, it takes away the heat of the mold 5, thereby dissipating heat for the mold 5.

[0048] In the rapid heat dissipation mode, the heat-conducting steel belt 702 is attached to the mold 5 through a continuous rotation mode, which can continuously dissipate heat from the mold 5. It is suitable for workpieces that require high heat dissipation speed but low heat dissipation uniformity.

[0049] The uniform cooling mode works as follows:

[0050] The adjustment rod 703 is started to drive the buckle frame 704 to move up and down reciprocatingly, so that the heat-conducting steel belt 702 is intermittently in close contact with and separated from the mold 5. At the same time, the driving roller 701 rotates intermittently. When the driving roller 701 stops rotating, the adjustment rod 703 drives the buckle frame 704 to move downward so that the heat-conducting steel belt 702 is in close contact with the mold 5. At this time, the heat-conducting steel belt 702 absorbs the heat of the mold 5 and plays a role in dissipating heat for the mold 5. When the driving roller 701 starts to rotate, the adjustment rod 703 drives the buckle frame 704 to move upward so that the heat-conducting steel belt 702 is separated from the mold 5.

[0051] In the uniform heat dissipation mode, the heat-conducting steel belt 702 dissipates heat by intermittently contacting the entire mold 5, and can dissipate heat at different positions of the mold 5 at the same time. It is suitable for workpieces that do not require high heat dissipation speed but high heat dissipation uniformity.

[0052] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A hot stamping device for metal processing, comprising a housing (1), characterized in that: An upper frame (2) and a lower frame (3) are provided inside the casing (1), and the upper frame (2) and the lower frame (3) are respectively connected to the inner wall of the casing (1) in a sliding manner and in a fixed manner. A hydraulic head (4) is fixedly connected to the top of the casing (1), and an output end of the hydraulic head (4) is fixedly connected to the upper frame (2). A mold (5) is fixedly connected to the bottom end of the upper frame (2) and the top end of the lower frame (3). A dual-mode cooler is provided inside the upper frame (2) and the lower frame (3), and the dual-mode cooler includes a mounting box (7). The inner wall of the mounting box (7) is rotatably connected to a plurality of driving rollers (7 01), a plurality of driving rollers (701) are rotatably connected with a heat-conducting steel belt (702), a radiator is installed in the middle of the installation box (7) and the heat-conducting steel belt (702) passes through the radiator, the inner wall of the heat-conducting steel belt (702) is fixedly connected with an adjusting pole (703), the output end of the adjusting pole (703) is fixedly connected with a buckle frame (704), the two ends of the buckle frame (704) are respectively located at the two ends of the mold (5), and the two ends of the buckle frame (704) are rotatably connected with a guide roller (705), and the guide roller (705) is transmission-connected to the heat-conducting steel belt (702).

2. A hot stamping device for metal processing according to claim 1, characterized in that: The radiator comprises a heat exchange box (6), wherein the interior of the heat exchange box (6) is rotatably connected to two outer transmission rollers (601) and an inner soaking roller (602), wherein both the outer transmission rollers (601) and the inner soaking roller (602) are transmission-connected to a heat-conducting steel belt (702), and the interior of the heat exchange box (6) is filled with a coolant.

3. The hot stamping device for metal processing according to claim 2, characterized in that: The bottom end of the heat exchange box (6) is fixedly connected with a heat sink (603) and a fan (604), and the inner soaking roller (602) is located inside the cooling liquid.

4. The hot stamping device for metal processing according to claim 2, characterized in that: Two tensioning devices are fixedly connected to the inner wall of the installation box (7), and the two tensioning devices are respectively located on both sides of the buckle frame (704). The tensioning devices include a long frame (8).

5. The hot stamping device for metal processing according to claim 4, characterized in that: A slider (801) is slidably connected inside the long frame (8), a top rod (802) is fixedly connected between the bottom end of the slider (801) and the bottom end of the long frame (8), a tensioning roller (803) is fixedly connected to the side wall of the slider (801), and the heat-conducting steel belt (702) and the tensioning roller (803) are transmission-connected.

6. The hot stamping device for metal processing according to claim 5, characterized in that: The outer transmission roller (601), the inner soaking roller (602), the driving roller (701), the guide roller (705) and the tensioning roller (803) are all composed of a support bar (9), a plurality of rotating drums (901) are sleeved on the support bar (9), and the rotating drums (901) and the support bar (9) are rotatably connected via bearings. A plurality of heat-conducting steel belts (702) are provided, and the width of each heat-conducting steel belt (702) is equal to the width of the rotating drum (901).

7. The hot stamping device for metal processing according to claim 6, characterized in that: The driving roller (701) further comprises a motor (902) and a gear ring (904), wherein the motor (902) is fixedly connected to the support bar (9), the output end of the motor (902) is fixedly connected to a gear (903), and the gear ring (904) is meshed with the gear (903).

8. A method for using a hot stamping device for metal processing according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, heating the workpiece, and then placing it between two molds (5), and then starting the hydraulic head (4) to drive the upper mold (5) to move downward to punch the workpiece; S2. Start the dual-mode cooler to cool the workpiece while stamping; S3, the hydraulic head (4) drives the upper die (5) to move upward, and the workpiece is removed from the die to complete the stamping.

9. The method for using a hot stamping device for metal processing according to claim 8, characterized in that: The dual-mode cooler has a fast heat dissipation mode and a uniform heat dissipation mode.

10. The method for using a hot stamping device for metal processing according to claim 8, characterized in that: The working method of the rapid heat dissipation mode is as follows: the regulating rod (703) is started to drive the buckle frame (704) to move downward so that the heat-conducting steel belt (702) is in contact with the top surface of the mold (5); at the same time, the driving roller (701) continuously drives the heat-conducting steel belt (702) to rotate, and the heat-conducting steel belt (702) takes away the heat of the mold (5) when in contact with the mold (5), thereby playing a role in heat dissipation for the mold (5); The working method of the uniform heat dissipation mode is as follows: the adjusting rod (703) is started to drive the buckle frame (704) to move up and down reciprocatingly, so that the heat-conducting steel belt (702) is intermittently in close contact with and separated from the mold (5); at the same time, the driving roller (701) is intermittently rotated; when the driving roller (701) stops rotating, the adjusting rod (703) drives the buckle frame (704) to move downward so that the heat-conducting steel belt (702) is in close contact with the mold (5); at this time, the heat-conducting steel belt (702) absorbs the heat of the mold (5) and plays a role in heat dissipation for the mold (5); when the driving roller (701) starts to rotate, the adjusting rod (703) drives the buckle frame (704) to move upward so that the heat-conducting steel belt (702) is separated from the mold (5).

Images