Convection cooling system and hot stamping device using the same

Abstract

A convection cooling system is used for cooling a hot stamping plate, comprising a convection box (101), wherein at least one set of fans (102) and corresponding air inlets (103) are respectively arranged at the head end and the tail end of the convection box (101), a strip-shaped air outlet (105) is opened at the top center of the convection box (101) along the length direction, and air guide plates (104) are respectively arranged on both sides along the length direction of the air outlet (105), and the two air guide plates (104) on both sides are arranged to be inclined with respect to the vertical plane. The cross section is a trapezoid that gradually narrows from top to bottom. The system is arranged along the extension direction of the bending head (25) of the hot stamping device, and provides rapid and uniform cooling after the plate is bent into place, so that the bending is fixed and the plate is prevented from rebounding or deforming. The hot stamping device using the above-mentioned convection cooling system is provided with a heating plate (18) connected by a spring (17) and a bending head (25) embedded with a heating component. It automatically folds corners, cools and fixes the shape, and unloads under the control of a PLC program, and has a high degree of automation.

Description

Technical Field

[0001] The invention relates to the technical field of sheet metal stamping machinery, and in particular to a convection cooling system and a hot stamping device using the same. Background Art

[0002] Sheet metal stamping is a forming method that relies on a press and a die to apply external force to the sheet metal to cause it to undergo plastic deformation or separation, thereby obtaining a workpiece of the desired shape and size. Bending is a common processing technology for sheet metal stamping. For example, the manufacturing of metal casings for automotive covers, home appliances and other products all require bending technology. The most common sheet metal bending technology is cold working, while the most common bending technology for large-sized pipes and profiles is hot working. However, for the bending of some medium and thick sheets, hot working can well solve the problem of deformation difficulties and avoid some defects in the products.

[0003] At present, the hot bending of plates generally has the problem of low degree of automation due to the complex process control. The loading, unloading, positioning, clamping and other operations face more difficulties than cold processing. In addition, the heating, demolding and rapid cooling and shaping of the plates after bending are all difficult problems in the industry. Summary of the invention

[0004] The purpose of the present invention is to first provide a convection cooling system to address the difficulty in quickly cooling and shaping the plate after heating and bending in the plate hot bending process, and on this basis to further provide a hot stamping device using the convection cooling system to comprehensively improve the efficiency of the plate hot bending process, eliminate defects such as rebound and deformation of the bent products, and improve the quality of the bent products.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A convection cooling system is used to cool hot stamping plates. The convection cooling system includes a convection box, a fan, an air inlet, an air guide plate and an air outlet. The convection box is a box structure with a certain length. At least one group of fans and corresponding air inlets are arranged at the head end and the tail end of the convection box. A strip-shaped air outlet is opened at the top center of the convection box along the length direction of the convection box. Air guide plates are arranged on both sides along the length direction of the air outlet. The two air guide plates on both sides are inclined to the vertical plane, and the cross-section is a trapezoid that gradually narrows from top to bottom.

[0007] In the convection cooling system as described above, the angle between the two air guide plates and the vertical plane (set as ɑ) is: 0°<ɑ≤35°.

[0008] In the convection cooling system as described above, baffles connecting the two air guide plates are arranged on the front and rear end surfaces of the two air guide plates, thereby forming an air guide space with closed front and rear end surfaces, an open upper end surface, and a lower end surface containing the air outlet.

[0009] In the convection cooling system as described above, sliding inserting plates are inserted into the tops of the front and rear ends of the two air guide plates through sliding slots.

[0010] As described above, the convection cooling system is arranged along the extension direction of the bending head of the hot stamping device, and the air outlet is directly opposite to the bent part of the hot stamping plate.

[0011] A hot stamping device comprises the above-mentioned convection cooling system.

[0012] Furthermore, the hot stamping device comprises two conveying frames arranged in parallel on the left and right, a base is arranged on the bottom surface of the conveying frame, and two groups of lower telescopic rods arranged in parallel on the left and right are fixedly connected to the top surface inside the base between the two conveying frames, and a heating plate is hinged on the top surface of each group of lower telescopic rods through a rotating shaft, and the heating plates on the left and right sides are connected by springs; the top surface of the conveying frame is connected to a transverse connecting rod through a bracket, and the transverse connecting rods are connected by a longitudinal connecting rod, and the bottom surface of the longitudinal connecting rod is fixedly connected to an upper driving rod, and the bottom surface of the upper driving rod is connected to a bending head, and the bending head is located directly above the spring.

[0013] Furthermore, in the above-mentioned hot stamping device, a first heating component is embedded in the heating plate, and a second heating component is embedded in the bending head.

[0014] Furthermore, in the above-mentioned hot stamping device, the convection cooling system is arranged on the top surface of the base and is located between the two groups of lower telescopic rods.

[0015] Furthermore, in the above-mentioned hot stamping device, auxiliary rollers are provided on the inner surface of the conveying frame located on both sides of the heating plate.

[0016] The beneficial effects of the technical solution of the present invention mainly include the following aspects:

[0017] 1. The convection cooling system of the present invention can be applied in the hot stamping process to provide rapid and uniform cooling after the sheet is bent into place, so as to fix the bending and prevent the sheet from rebounding or deforming due to its inability to withstand the influence of its own weight or the thrust of demolding when demolding in a hot state, thereby ensuring the efficient operation of the hot stamping equipment and the stability of the product size and quality.

[0018] 2. The hot stamping device using the convection cooling system of the present invention heats the bottom surface of the plate through a heating plate connected with a spring to prevent cracking on the tensile side of the plate during bending. At the same time, the top surface of the plate is heated by the first heating component arranged inside the bending head to prevent wrinkles on the compressive side of the plate. After bending and forming, the convection cooling system is used to quickly cool and shape the plate. Under the control of the PLC program, the upper driving rod, the lower telescopic rod, and the spring cooperate to eject the plate with the folded corners, completing automatic unloading. Since the key problems of hot bending process control and size shaping are solved, the degree of automation is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a convection cooling system proposed by the present invention;

[0020] Figure 2 for Figure 1 An enlarged view of the sliding plate installation structure of the convection cooling system shown;

[0021] Figure 3 A schematic diagram of the structure of a hot stamping device using a convection cooling system proposed in the present invention;

[0022] Figure 4 for Figure 3 A schematic diagram of the connection between the upper driving rod and the bending head of the hot stamping device shown;

[0023] Figure 5 for Figure 3 Schematic diagram of the internal structure of the bending head of the hot stamping device shown.

[0024] Legend:

[0025] Figure 1-3 Middle: 100, convection cooling system; 101, convection box; 102, fan; 103, air inlet; 104, air guide plate; 105, air outlet; 106, sliding plug plate; 107, sliding slot.

[0026] Figure 3-5 In: 1. Conveyor frame; 2. Servo motor; 3. Reversing gear set; 4. Bracket; 5. Horizontal connecting rod; 6. Scale; 7. Top screw; 8. Alignment groove; 9. Slider; 10. Limit plate; 11. Plate detector; 12. Upper drive rod; 13. Longitudinal connecting rod; 14. Rotating shaft; 15. Lower telescopic rod; 16. First heating component; 17. Spring; 18. Heating plate; 19. Auxiliary roller; 20. Conveyor roller; 21. Rotating rod; 22. Conveyor roller groove; 23. Pulley; 24. Base; 25. Bending head; 26. Second heating component; 27. PLC controller; 28. Button groove; 29. ​​Button; 30. Elastic member; 31. Contact; 32. Contact piece. DETAILED DESCRIPTION

[0027] The technical solution in the embodiment of the present invention is described in more detail below with reference to the accompanying drawings:

[0028] Example 1

[0029] Reference Figure 1 A convection cooling system 100 is used to cool a hot stamping sheet, and includes a convection box 101, a fan 102, an air inlet 103, an air guide plate 104 and an air outlet 105. As the best application, the hot stamping device used in the convection cooling system 100 of this embodiment is a hot bending device. Therefore, the convection box 101 is a rectangular box structure with a certain length, which is arranged along the extension direction of the bent sheet. A group of fans 102 and corresponding air inlets 103 are respectively arranged at the head end and the tail end of the convection box 101. A strip-shaped air outlet 105 is opened at the top center of the convection box 101 along the length direction of the convection box 101, and the air outlet 105 is directly opposite to the bent part of the hot stamping sheet.

[0030] A set of fans 102 and corresponding air inlets 103 are respectively arranged at the head end and the tail end of the convection box 101. This arrangement can accelerate the flow of cold air in the convection box 101 and improve the cooling effect. The strip-shaped air outlet 105 has a uniform width in the length direction, and the slit is used to increase the wind speed and the wind speed is uniform in the length direction. In addition, air guide plates 104 are respectively arranged on both sides of the length direction of the air outlet 105, so that the discharged cold air can be directly guided to the bent plate to quickly cool the bent plate. Figure 1 As shown, the two air guide plates 104 on both sides are inclined to the vertical plane, and the cross-section is a trapezoid that gradually narrows from top to bottom. Preferably, the angle (set as ɑ) between the two air guide plates 104 and the vertical plane is in the range of 0°<ɑ≤35°, and more preferably 15°~20°.

[0031] Preferably, the front and rear end surfaces of the two air guide plates 104 are provided with baffles connecting the two air guide plates 104, so as to enclose an air guide space with closed front and rear end surfaces, an open upper end surface, and a lower end surface including the air outlet 105, and, in combination with Figure 2 As shown, a sliding plate 106 is inserted into the top of the front and rear ends of the two air guide plates 104 through a sliding slot 107. The purpose of setting the sliding plate 106 is to block a part of the air outlet 105 by pushing the sliding plate 106 when the size of the bent plate is small, so as to avoid invalid air loss and increase the wind speed at the action part. As shown in the figure, the edge of the sliding plate 106 is provided with a bending portion for easy pushing.

[0032] Example 2

[0033] This embodiment provides a hot stamping device using the convection cooling system 100 of Embodiment 1, which is used for bending a plate.

[0034] like Figure 3-5 As shown, it includes two conveying frames 1 arranged in parallel on the left and right, a base 24 is arranged on the bottom surface of the conveying frame 1, and two groups of lower telescopic rods 15 arranged in parallel on the left and right are fixedly connected on the top surface inside the base 24 between the two conveying frames 1, and a heating plate 18 is hinged on the top surface of each group of lower telescopic rods 15 through a rotating shaft 14, and the heating plates 18 on the left and right sides are connected by springs 17; the top surface of the conveying frame 1 is connected to a transverse connecting rod 5 through a bracket 4, and the transverse connecting rods 5 are connected by a longitudinal connecting rod 13, and the bottom surface of the longitudinal connecting rod 13 is fixedly connected to an upper driving rod 12, and the bottom surface of the upper driving rod 12 is connected to a bending head 25, and the bending head 25 is located directly above the spring 17, and further, a first heating component 16 is embedded in the heating plate 18, and a second heating component 26 is embedded in the bending head 25.

[0035] Specifically, the convection cooling system 100 is disposed on the inner top surface of the base 24 and located between the two sets of lower telescopic rods 15 .

[0036] For further information, see Figure 5 A button groove 29 is provided on the surface of the bending head 25, and a contact piece 32 is embedded in the bottom surface of the button groove 29, a button 29 is slidably connected inside the button groove 29, and the button 29 is connected to the bottom surface of the button groove 29 through an elastic member 30, and a contact 31 is welded on one side surface of the button 29 inside the button groove 29.

[0037] Further, such as Figure 1 As shown, auxiliary rollers 19 are provided on both sides of the heating plate 18 on the inner surface of the conveying frame 1, and a plate detector 11 is embedded on the bottom surface of the longitudinal connecting rod 13 on one side of the upper driving rod 12, and a PLC controller 27 is embedded on the surface of one side of the conveying frame 1, wherein the output end of the PLC controller 27 is electrically connected to the input end of the servo motor 2, the input end of the upper driving rod 12, the input end of the lower telescopic rod 15, the input end of the first heating component 16, the input end of the second heating component 26, and the input end of the fan 102, and the output end of the plate detector 11 is electrically connected to the input end of the PLC controller 27.

[0038] In addition, as an improved functional part of the hot stamping device of the present invention, Figure 1As shown, a slider 9 is slidably sleeved on the surface of the transverse connecting rod 5, and an alignment groove 8 is opened on the surface of the slider 9, and a top screw 7 is threadedly connected to the top surface of the slider 9, and a limit plate 10 is fixedly connected to the bottom surface of the slider 9. The limit plate 10 is used to limit the plate in transmission to prevent position displacement. A scale 6 is printed on the surface of the transverse connecting rod 5. The sliding slider 9 slides on the transverse connecting rod 5. According to the width of the plate, the spacing between the limit plates 10 is determined by aligning the groove 8 and the scale 6. After determination, the top screw 7 is screwed downward until the top screw 7 completely supports the transverse connecting rod 5 to fix the position of the slider 9 and the limit plate 10.

[0039] Furthermore, a conveying roller groove 22 is opened on the top surface of the conveying frame 1, and a conveying roller 20 is arranged inside the conveying roller groove 22, and the conveying roller 20 is rotatably connected to the conveying roller groove 22 through a rotating rod 21. The conveying roller 20 and the corresponding conveying roller groove 22 and the rotating rod 21 are all provided with multiple groups. One end of the rotating rod 21 located at the end position is located inside the conveying frame 1 and is connected to the output end of the servo motor 2 through a reversing gear set 3, and the servo motor 2 is fixedly connected to the inside of the conveying frame 1. A pulley 23 is fixed on the surface of one end of each rotating rod 21, and the pulleys 23 on adjacent rotating rods 21 are connected in sequence through belts. The servo motor 2 drives the reversing gear set 3 to rotate, and the reversing gear set 3 drives the rotating rod 21 and the conveying roller 20 to rotate, so that the conveying roller 20 achieves the conveying effect. At the same time, multiple conveying rollers 20 are driven by one servo motor 2, and the synchronization rate is high.

[0040] When the hot stamping device of the present invention is in use, the slider 9 is moved to slide on the transverse connecting rod 5, the spacing between the limit plates 10 is determined according to the width of the plate, the top screw 7 is screwed to support the transverse connecting rod 5, the position of the slider 9 and the limit plate 10 is fixed, the plate is placed between the limit plates 10, the power supply is started through the PLC controller 27, the servo motor 2 drives the reversing gear set 3 to rotate, the reversing gear set 3 drives the rotating rod 21 and the conveying roller 20 to rotate, and the plate is conveyed to the bottom of the plate detector 11. When the plate moves to the bottom of the plate detector 11, , the plate detector 11 sends a signal, the PLC controller 27 controls the servo motor 2 to stop working, controls the first heating component 16 to heat, heats the bottom surface of the plate, and prevents wrinkles on the compressed side surface of the plate. During the bending process, the PLC controller 27 controls the upper driving rod 12 to extend and push the bending head 25 to move downward to squeeze the plate. The plate is bent under the restriction of the auxiliary roller 19, and the lower telescopic rod 15 contracts. The heating plate 18 rotates along the rotating shaft 14 with the bending angle of the plate, and the spring 17 is stretched to continuously heat the bottom surface of the plate. Heat is used to avoid cracking of the sheet caused by over-speed extrusion. The sheet is bent to the edge of the sheet and the button 29 is squeezed until the contact 31 contacts the contact piece 32. After the contact 31 contacts the contact piece 32, the PLC controller 27 controls the upper drive rod 12 to stop extending. Since the sheet has been bent into place at this time, it is still in a hot state. If it is directly released or ejected, the sheet loses its support. Under the action of its own weight and the demoulding force, the part with a high temperature still has the possibility of rebound and deformation. Therefore, the PLC controller 27 controls the first heating component 16 and the second heating component 16 to stop extending. When component 26 stops heating, fan 102 is controlled to turn on, and the convection cooling system of the present invention is used to assist in cooling and shaping the plate. After the auxiliary cooling delay, the PLC controller 27 controls the upper drive rod 12 to contract and the lower telescopic rod 15 to extend. At the same time, the spring 17 rebounds to eject the folded corner plate, completing the automatic unloading process. Due to the effect of the convection cooling system, the pause time set in the PLC controller is greatly reduced, which not only ensures the product size accuracy but also shortens the single-piece processing cycle and improves the processing efficiency.

[0041] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A convection cooling system for cooling hot stamping sheets, characterized in that: The convection cooling system (100) comprises a convection box (101), a fan (102), an air inlet (103), an air guide plate (104) and an air outlet (105); the convection box (101) is a box structure having a certain length; at least one set of fans (102) and corresponding air inlets (103) are respectively arranged at the head end and the tail end of the convection box (101); a strip-shaped air outlet (105) is opened at the top center of the convection box (101) along the length direction of the convection box (101); air guide plates (104) are respectively arranged on both sides along the length direction of the air outlet (105); the two air guide plates (104) on both sides are arranged obliquely with respect to the vertical plane, and the cross section is a trapezoidal shape that gradually narrows from top to bottom; The included angle between the two air guide plates (104) and the vertical plane is set to ɑ, satisfying 0°<ɑ≤35°; The front and rear end surfaces of the two air guide plates (104) are provided with baffles connecting the two air guide plates (104), thereby enclosing an air guide space with closed front and rear end surfaces, an open upper end surface, and a lower end surface containing the air outlet (105); A sliding plug plate (106) is inserted into the top of the front and rear ends of the two air guide plates (104) through a sliding slot (107); The convection cooling system (100) is arranged along the extension direction of the bending head (25) of the hot stamping device, and the air outlet (105) is directly opposite to the bent portion of the hot stamping plate.

2. A hot stamping device, characterized in that: A convection cooling system (100) comprising the method of claim 1.

3. A hot stamping device according to claim 2, characterized in that: The invention comprises two conveying frames (1) arranged in parallel on the left and right, wherein a base (24) is arranged on the bottom surface of the conveying frames (1), and two groups of lower telescopic rods (15) arranged in parallel on the left and right are fixedly connected on the top surface located inside the base (24) between the two conveying frames (1), and a heating plate (18) is hingedly connected to the top surface of each group of lower telescopic rods (15) through a rotating shaft (14), and the heating plates (18) on the left and right sides are connected by a spring (17); the top surface of the conveying frame (1) is connected to a transverse connecting rod (5) through a bracket (4), and the transverse connecting rods (5) are connected to each other through a longitudinal connecting rod (13), and the bottom surface of the longitudinal connecting rod (13) is fixedly connected to an upper driving rod (12), and the bottom surface of the upper driving rod (12) is connected to a bending head (25), and the bending head (25) is located directly above the spring (17).

4. A hot stamping device according to claim 3, characterized in that: A first heating component (16) is embedded in the heating plate (18), and a second heating component (26) is embedded in the bending head (25).

5. A hot stamping device according to claim 3, characterized in that: The convection cooling system (100) is arranged on the inner top surface of the base (24) and is located between the two sets of lower telescopic rods (15).

6. A hot stamping device according to claim 3, characterized in that: Auxiliary rollers (19) are provided on the inner surface of the conveying frame (1) at both sides of the heating plate (18).

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