JP4523184B2 - Manufacturing method of plate material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a plate having differential thickness portions having different thicknesses.
[0002]
[Prior art]
As a method of forming the differential thickness portion on the plate material, first, a method of forming the differential thickness portion on the plate material by rolling and then annealing the plate material formed with the differential thickness portion is known. Specifically, for example, rolling is disclosed in Japanese Patent Application Laid-Open No. 59-189004 “Differential Thick Plate Manufacturing Method and Rolling Machine”. According to FIG. 3 of the publication, the rolling mill for manufacturing the differential thickness plate independently uses the upper work roll 14a (the reference sign is the same as that described in the publication. The same applies hereinafter) and the lower work roll 14b. It can be driven and controlled, and the lower work roll 14b is driven in the reverse direction and rolled to form a differential thickness plate.
Next, the heating state of the plate after rolling will be described.
[0003]
19 (a) and 19 (b) are diagrams illustrating heating of a conventional plate material.
In (a), the plate member 141 is formed by forming the differential thickness portions 142 and 143, the differential thickness portion 142 has a thickness t2, and the differential thickness portion 143 has a thickness t3. t1 is the thickness of the plate 141, which is the thickness of the first plate.
The plate material 141 is put in the heating furnace 144 and heated by the heaters 145 (... indicates a plurality. The same applies hereinafter), and the plate material 141 is annealed. A, B, and C indicate measurement units that measure temperature. An example of the measurement results is shown in the following figure.
[0004]
(B) is a diagram which shows the heating state of a board | plate material, A horizontal axis is made into time and the vertical axis | shaft is made into the temperature of a board | plate material. Measuring unit A is temperature T3, measuring unit B is temperature T2, and measuring unit C is temperature T1. Thus, by heating the board | plate material 141 with the heating furnace 144, the board | plate material 141 can be annealed and the board | plate material which shape | molded the difference thickness part can be obtained.
[0005]
[Problems to be solved by the invention]
The temperature of the plate material 141 heated in the heating furnace 144 is as shown in FIG. 18B, and the heating furnace 144 heats the difference thickness part 143 of the measurement part C to a desired temperature T1, and accordingly, Since the difference thickness part 142 of the measurement part B is heated to the temperature T2, the temperature variation of the plate 141 during annealing is large. Therefore, the plate material 141 has a difference in material strength between the strength of the material of the differential thickness portion 143 heat-treated at a desired temperature and the thickness of the differential thickness portion 142 heat-treated at a temperature other than that, In the heating furnace 144, it is difficult to make the material characteristics uniform.
[0006]
In addition, the heating furnace 144 heats the plate 141 of the measurement part A that does not need to be annealed and raises the temperature to the temperature T3, so that it is difficult to make the material properties of the plate formed with the differential thickness portion uniform.
On the other hand, after forming the differential thickness portions 142 and 143 by rolling, it is necessary to transport the plate material 141 from the rolling device to the heating furnace 144, and it takes time to set up the plate material 141 for annealing.
[0007]
Accordingly, an object of the present invention is to adjust the plate material formed with the differential thickness portion to a plate material that is annealed and has uniform material properties, and to improve the production efficiency of the plate material formed with the differential thickness portion. It is providing the manufacturing method of a board | plate material.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a plate material setting step for setting a plate material between upper and lower rolls of a rolling means, a gripping step for gripping both ends of the set plate material, and applying a constant tension to the gripped plate material. A tension applying step, and while applying tension, the rolling means is turned, the axis of the upper and lower rolls is set non-perpendicular to the longitudinal direction of the plate material, and the difference thickness part is formed by rolling with the upper and lower rolls. From the differential thickness portion forming step, and an annealing step of heating the differential thickness portion of the plate material to a predetermined temperature while feeding the formed plate material continuously to the heating device provided in the conveyance line and feeding the plate material in the heating device. Become.
[0009]
In the annealing process, while feeding the plate material in the heating device, the difference thickness part of the plate material is heated to a predetermined temperature, so the temperature variation due to the difference in thickness can be made extremely small, and there is no concern about variations in material properties .
Further, in the annealing process, the formed plate material is continuously sent to the heating device provided in the transport line, so that it does not take time for setup before annealing.
[0010]
According to a second aspect of the present invention, the annealing step is characterized in that the annealing is performed while the heating to the non-rolled portion is interrupted simultaneously with the heating to the differential thickness portion.
In the annealing step, the differential thickness portion can be easily heated under a predetermined temperature condition, and the material properties of the plate material formed with the differential thickness portion become more uniform.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a plan view of a plate material manufacturing apparatus used in a plate material manufacturing method according to the present invention. Y shown in the upper left of the figure is the conveying direction during rolling, and X is an axis orthogonal to Y.
The plate material manufacturing apparatus 10 includes a cutting machine 11, a rolling device 12, a transport table 13, and a heating device 14 arranged in this order. Reference numerals 15, 16, 17, and 18 denote roller conveyors, 21 denotes a control panel, 22 denotes a hydraulic unit, 23 denotes an operation panel of the rolling device 12, and 24 denotes an operation panel of the heating device 14. Reference numeral 137 denotes a plate material after rolling.
The operation panel 24 includes condition setting means 26 and control means 27.
The transport table 13 includes a positioning guide 28a and a conveyor 28b.
[0012]
FIG. 2 is a side view of a plate material manufacturing apparatus used in the plate material manufacturing method according to the present invention.
The cutting machine 11 cuts the strip loaded from the left side of the drawing to form a plate material having a predetermined length.
The rolling device 12 includes a tension device 30 and rolling means 60.
[0013]
The tension device 30 is movable in the X-axis direction (see FIG. 1), and includes X-axis movement guides 30a and 30a, an X-axis movement base 30b mounted on the X-axis movement guides 30a and 30a, and the X-axis movement base 30b. The X-axis drive means 30c and 30c shown in FIG. 1, the X-axis movement position detector 30d shown in FIG. 1, and the elements described in the next figure are used to move the axis movement base 30b in the X-axis direction.
[0014]
FIG. 3 is a perspective view of a tension device used in the plate material manufacturing method according to the present invention. The tension device 30 has a left clamp means 32, a right clamp means 33 and tension applying means 34 and 35 on a moving table 31.
The moving table 31 is obtained by attaching a Y-axis moving base 38 to a base 36 via a first guide 37.
[0015]
The left clamp means 32 has a housing 41 attached to the left side of the Y-axis moving base 38, and an upper pressing portion 42 is attached to the center of the housing 41 via a guide so as to be movable up and down. The pressing portion 43 is fixed, and hydraulic cylinders 44, 44 are attached to the upper portion of the housing 41. The rod 45 of the hydraulic cylinder 44 is attached to the upper pressing portion 42, and the upper pressing portion 42 is hydraulically pressed to the lower pressing portion 43. It pushes to the side.
[0016]
On the other hand, the right clamp means 33 has upper and lower pressing portions 42 and 43 and hydraulic cylinders 44 and 44 similar to the left clamp means 32 attached to a housing 47 attached to the right side of the Y-axis movement base 38 via a second guide 46. It is provided. 48 is a left clamp position detector, 49 is a right clamp position detector, and these left and right clamp position detectors 48 and 49 are, for example, a linear encoder or a linear position sensor.
[0017]
Further, the tension applying means 34 is a hydraulic cylinder 51, the attachment portion 52 of the hydraulic cylinder 51 is attached to the base 36, and the rod 53 is attached to the Y-axis movement base 38. The tension applying means 35 is a hydraulic cylinder 55, the attachment portion 56 of the hydraulic cylinder 55 is attached to the Y-axis movement base 38, and the rod 57 is attached to the right clamp means 33.
[0018]
FIG. 4 is a perspective view of rolling means used in the plate material manufacturing method according to the present invention. The rolling means 60 is supported by a stand 61 so as to be movable up and down via third guides 62 and 62 (not shown). Boxes 63 and 63 are fitted, work rolls 64 and backup rolls 65 and 65 as upper rolls are fitted to these bearing boxes 63 and 63 via bearings (not shown), and these rolls 64, 65 and 65 are fitted. Symmetrically, a work roll 66 as a lower roll and backup rolls 67, 67 are fitted to the stand 61 via a bearing (not shown), and a reduction hydraulic cylinder 68, 68 is attached to the upper portion of the stand 61, and this reduction hydraulic cylinder 68 and 68 rods are attached to the bearing boxes 63 and 63, and the work rolls 64 and 66 are fitted to the roll driving units 69 and 69. That. 71 is a work roll position detector, 72 is a left clamp movement limit detector, 73 is a right clamp movement limit detector, 74 and 74 are heating means, and 90 is a turntable.
[0019]
The work roll position detector 71 is, for example, a linear encoder or a linear position sensor, and the left / right clamp movement limit detectors 72, 73 are, for example, limit switches. The heating means 74 is a heat source (heater) for electromagnetic induction heating (induction heating), and is provided on the left and right of the work rolls 64 and 66.
[0020]
The turntable 90 is provided with a rotation support portion 92 at the center of the mounting base 91 and a drive portion 93 at the end. The drive unit 93 includes a guide 94 attached to the mounting base 91 and a worm speed reducer 95 that drives the guide 94.
[0021]
That is, the rolling means 60 is mounted on the turntable 90 by fitting the rolling means 60 to the rotation support portion 92 of the turntable 90 and attaching one end of the guide 94 to the rolling means 60. 96 is an origin position detector, 97 is a right rotation limit detector, and 98 is a left rotation limit detector.
[0022]
FIG. 5 is a perspective view of a heating device used in the plate material manufacturing method according to the present invention.
The heating device 14 is electric heating, and a conveying unit 101 that continuously and horizontally conveys the rolled plate material 137 (see FIG. 1), and a direction perpendicular to the conveying direction (X-axis direction) above the conveying unit 101. Heating means 102 provided movably in the direction (Y-axis direction), a heat source moving means 103 for moving the heating means 102, a first differential thickness portion 83 as a differential thickness portion of the plate material 137 (see FIG. 10), and Condition setting means 26 (see FIG. 1) for setting the heating conditions according to the second differential thickness portion 136, and control means 27 (see FIG. 1) for controlling the heating means 102 and the heat source moving means 103 based on the heating conditions. , A shield plate 104 movably attached in the Y-axis direction, a furnace body 105, and a support base 106 that supports the furnace body 105.
[0023]
The furnace body 105 has a heat insulating material 107 attached to a wall, an inlet 108 formed on one side, and an outlet 109 formed on the other side.
The heating means 102 is obtained by attaching first to seventh near-infrared radiation sources 121, 122, 123, 124, 125, 126, 127 as heat sources in order from the inlet 108 side to the brackets 111. A workpiece carry-in detector 128 for detecting the workpiece carry-in is provided.
[0024]
The heat source moving means 103 includes seven ball screw units 131 (motor 132, screw shaft 133, nut 134). The nut 134 is for attaching the bracket 111.
The shielding plate 104 shields heat transfer from the heating means 102. The material of the shielding plate 104 is a heat insulating material, but a material other than the heat insulating material may be used.
[0025]
6 is a cross-sectional view taken along line 6-6 in FIG. 5, and the first to seventh radiation sources 121 to 127 of the heating unit 102 are movable in the orthogonal direction (Y-axis direction) above the conveying unit 101 that conveys the workpiece. It shows that the shielding plate 104 is disposed between the heating means 102 and the conveying means 101.
The first to seventh radiation sources 121 to 127 are, for example, quartz tube type infrared light bulbs.
The conveying means 101 includes a motor 138 a arranged outside the furnace body 105 and a roller 138 b arranged inside the furnace body 105.
[0026]
Next, the manufacturing method of the board | plate material which concerns on this invention is demonstrated.
FIG. 7 is a flowchart of a method for manufacturing a plate material according to the present invention, and ST indicates a step.
ST01: A plate material is set between the upper and lower rolls of the rolling means.
ST02: Grasp both ends of the set plate.
ST03: A constant tension is applied to the gripped plate material.
ST04: Rolling with a roll to form a differential thickness portion while applying tension.
ST05: The formed plate material is continuously sent to the heating device and heated to a predetermined temperature while being sent in the heating device.
Next, ST01 to ST05 will be specifically described.
[0027]
FIGS. 8A and 8B are first explanatory views of the plate material manufacturing method according to the present invention.
(A): First, the plate material 81 is passed through the rolling device 12. Specifically, the left clamp means 32 reaches a predetermined position by the advance of the hydraulic cylinder 51 (rod 53) (in the direction of arrow (1)). At this time, the left clamp movement limit detector 72 prevents the left clamp means 32 from being excessively moved.
[0028]
When the hydraulic cylinders 44 and 44 (rods) on the left and right clamping means 32 and 33 are retracted (in the directions of arrows (2) and (2)), the upper pressing portion 42 is raised. On the other hand, the work roll 64 and the backup rolls 65 and 65 are lifted together with the bearing box 63 by the rolling hydraulic cylinder 68 of the rolling means 60.
[0029]
After passing the plate material 81 before rolling to the left clamp means 32 as indicated by the arrow (3), the upper pressing portion 42 of the left clamp means 32 is lowered and the thick portion 82 of the plate material 81 is gripped. On the other hand, the work roll 64 and the backup rolls 65 and 65 are pressed down on the plate member 81 by the reduction hydraulic cylinder 68.
[0030]
(B): Next, the first differential thickness portion 83 is formed by driving and rotating the work roll 64 at a predetermined roll speed. At the same time, by moving the left clamp means 32 in the tension direction (the direction of arrow (4)), the first differential thickness portion 83 is formed while applying a constant tension t to the plate material 81. When the left clamp means 32 reaches a predetermined position, it stops.
[0031]
Subsequently, in order to reversely rotate the rolling means 60, the right clamp means 33 is brought close to the vicinity of the rolling means 60, and the upper pressing portion 42 is lowered by the hydraulic cylinder 44 on the right clamp means 33 to thicken the plate 81. The part 82 is gripped. The position of the right clamp means 33 at that time is detected by the right clamp movement limit detector 73.
[0032]
FIGS. 9A and 9B are second explanatory views of the plate material manufacturing method according to the present invention.
(A): The work roll 64 of the rolling means 60 is reversely rotated to extend the first differential thickness portion 83 thinner. At that time, the work roll 64 is further reduced by the reduction hydraulic cylinder 68 to control the roll interval. At the same time, the Y-axis movement base 38 is reversely moved by the hydraulic cylinder 51.
[0033]
(B): A constant tension t is applied to the plate 81 by moving the right clamp means 33 by the hydraulic cylinder 55 on the Y-axis movement base 38 while moving the Y-axis movement base 38 in the reverse direction. At that time, the right clamp means 33 is positioned by the right clamp position detector 49.
Thereafter, the molding of the first differential thickness portion 83 shown in FIGS. 8 and 9 is further repeated to form the first differential thickness portion 83 having a desired thickness.
[0034]
That is, the plate material 81 is gripped by the left and right clamping means 32 and 33 and rolled while applying a tension t to the plate material 81. When the tension t acts on the first differential thickness portion 83, the first differential thickness portion 83 can be formed on a part of the thick portion 82 of the plate 81 very easily.
Further, it is possible to prevent “wrinkles” and bends that are likely to occur in the first differential thickness portion 83 due to the tension t.
[0035]
FIGS. 10A and 10B are third explanatory views of the plate material manufacturing method according to the present invention.
(A): The rolling means 60 is turned by the turntable 90, and the axis of the work roll 66 is set at a non-right angle with respect to the longitudinal direction of the plate 81. That is, the work roll 66 is set to the turning angle θ.
[0036]
(B): The work rolls 64 and 66 are driven, and a fixed tension is applied to the plate material 81 reciprocated by the rotation of the work rolls 64 and 66 having the turning angle θ by the left and right clamp means 32 and 33. The work rolls 64 and 66 repeat forward and reverse rotations to reciprocate the first differential thickness portion 83, so that the first differential thickness portion 83 gradually extends and the boundary line 86 can form an angle θ.
[0037]
In addition, the rolling means 60 is returned by the turning angle θ by the turntable 90 (see a), continuously turned by the turning angle β, and reciprocated in the same manner to form the first differential thickness portion 83, and the boundary line An angle of 85 can be formed in β. The thickness of the first differential thickness portion 83 is t2.
[0038]
When the extension in the X-axis direction is large, the upper pressing portion 42 is once raised like a virtual line and the left clamp means 32 is returned to the origin. By returning to the origin, shortage of the stroke amount of the X-axis drive means (hydraulic cylinder) is prevented.
[0039]
FIGS. 11A and 11B are fourth explanatory views of the plate material manufacturing method according to the present invention.
(A): The second differential thickness portion 136 is formed by the rolling means 60. Specifically, the upper pressing portion 42 of the right clamp means 33 is raised and released, and one of the plate members 81a is extended by the work rolls 64 and 66 while applying tension by the left clamp means 32, and the second differential thickness portion. 136 is formed. 81b is the other of the board | plate material 81, and is a non-rolling part.
The thickness of the second differential thickness portion 136 is t3, and the processing degree of the second differential thickness portion 136 is smaller than that of the first differential thickness portion 83.
[0040]
Here, the degree of processing corresponds to the rolling reduction. When the reduction ratio is r, the reduction ratio of the first differential thickness portion 83 is r1, the reduction ratio of the second differential thickness portion 136 is r2, the inlet side plate thickness is h1, and the outlet side plate thickness is h2, the reduction rates r and r1 , R2 can be determined by the following equation.
r (%) = [(h1-h2) / h1] × 100,
r1 (%) = [(t1-t2) / t1] × 100,
r2 (%) = [(t1-t3) / t1] × 100
[0041]
(B) shows the plate material 137 in which the first and second differential thickness portions 83 and 136 having different thicknesses are formed and rolled.
The plate material 137 has different material properties such as tensile strength in the non-rolled portion 81b and the first and second differential thickness portions 83 and 136 depending on the degree of processing. Therefore, the plate material 137 is then annealed.
[0042]
12A and 12B are fifth explanatory views of the plate material manufacturing method according to the present invention.
(A): The plate material 137 is annealed by the heating device 14. Specifically, the heating conditions necessary for annealing are set in advance by the condition setting means 26 (for example, a keyboard) according to the first and second differential thickness portions 83 and 136 of the plate material 137 and other conditions.
The heating conditions mainly include a workpiece conveyance speed Vw for controlling the conveyance means 101, a movement speed Vh for controlling the heat source movement means 103, timer set values S1 and S2, and set temperatures Th1 to Th7 for controlling the heating means 102. To do.
The control means 27 includes a work speed control unit 27a, a heat source speed control unit 27b, timers TM1 and TM2, and a temperature control unit 27c.
[0043]
When the heating device 14 turns on a predetermined button of the condition setting means 26, the heating means 102 moves as indicated by an arrow based on a preset condition, enters a standby state, and the first near infrared ray -Seventh radiation sources 121-127 wait for a work in the state of preset temperature Th1-Th7.
[0044]
After the presetting is completed, first, the plate material 137 exiting the rolling device 12 is conveyed to the conveying table 13 by the roller conveyor 17 and positioned by the positioning guide 28a as indicated by the arrow (5) from the conveying table 13, while the heating device 14 is moved. To the entrance 108 of the.
Since the positioning guide 28a is provided, the start positions of the first to seventh radiation sources 121 to 127 can coincide with the boundary line 86 of the angle θ of the plate member 137, and the shielding plate 104 can be aligned with the boundary line 85 of the angle β. The edges can be matched.
[0045]
As described above, the rolling device 12, the roller conveyor 17, the conveying table 13, the heating device 14, and the conveying means 101 of the heating device 14 are continuously arranged in this order. The plate material 137 formed with the first and second differential thickness portions 83 and 136 can be continuously transported in a short time, so that the transport to the heating device 14 is not time-consuming and the setup of annealing is not time-consuming. Therefore, it is possible to improve the production efficiency of the plate material 137 formed with the first and second differential thickness portions 83 and 136.
[0046]
(B): When the plate material 137 reaches the entrance 108, the roller 138b of the conveying means 101 is rotated by a signal to the workpiece carry-in detector 128, and the plate material 137 is moved in the X-axis direction at the predetermined workpiece conveyance speed Vw by the arrow (6). Transport as follows.
Further, the heat source moving means 103 of the first radiation source 121 is actuated by a signal to the work carry-in detector 128, and the first radiation source 121 is sent in the Y-axis direction as indicated by an arrow (7) at a predetermined moving speed Vh. As a result, the first radiation source 121 can heat the first differential thickness portion 83.
[0047]
13 (a) and 13 (b) are sixth explanatory views of the plate material manufacturing method according to the present invention.
(A): The plate material 137 is heated while being conveyed. Here, the heat source moving means 103 of the second and third radiation sources 122 and 123 operates according to the amount of movement of the plate material 137. That is, the second radiation source 122 and the third radiation source 123 are sent in the Y-axis direction at the moving speed Vh along the boundary line 86 of the angle θ, and the movement of the first radiation source 121 is continued. The first differential thickness portion 83 can be further heated by the three radiation sources 121 and 123, and the second differential thickness portion 136 can be heated by the second and fourth radiation sources 122 and 124.
[0048]
(B) is the bb sectional drawing of (a), and shows the 1st radiation source 121, the 2nd radiation source 122, and the shielding board 104. FIG.
The first radiation source 121 is set to the set temperature Th1, the third radiation source 123 is set to the set temperature Th3, and the heating is performed as indicated by the arrow (8) and is sent in the Y-axis direction, so that a predetermined rate of temperature increase is achieved. The first differential thickness portion 83 can be heated at Tv.
[0049]
In addition, the second radiation source 122 is set to the set temperature Th2, the fourth radiation source 124 is set to the set temperature Th4, and it is sent in the Y-axis direction while being heated as indicated by the arrow (9). The second differential thickness portion 136 can be heated at the temperature rate Tv.
On the other hand, since the shielding plate 104 is provided and the shielding plate 104 is disposed above the non-rolled portion 81b, the heat transfer of the first and third radiation sources 121 and 123 can be blocked as indicated by the arrow a, and the non-rolled portion The temperature of 81b can be lowered.
[0050]
14 (a) and 14 (b) are seventh explanatory views of the plate material manufacturing method according to the present invention.
(A): Continue heating while conveying the plate material 137. The heat source moving means 103 of the second to seventh radiation sources 122 to 127 operates in accordance with the conveyance of the plate material 137, and the second to seventh radiation sources 122 to 127 are sent in the Y-axis direction at the moving speed Vh, and Since the first differential thickness portion 83 is heated at the set temperature Th5 of the fifth radiation source 125 and the preset temperature Th7 of the seventh radiation source 127, the first differential thickness portion 83 can be held constant at a predetermined holding temperature. .
Similarly, the temperature of the second differential thickness portion 136 can be maintained at the set temperature Th6 of the sixth radiation source 126.
[0051]
(B): The plate material 137 is cooled while being conveyed. In accordance with the conveyance of the plate material 137, the temperature of the plate material 137 is maintained while sending the fifth to seventh radiation sources 125 to 127 in the Y-axis direction at the moving speed Vh.
On the other hand, the plate material 137 can be gradually cooled by feeding the plate material 137 out of the furnace from the outlet 109 of the furnace body 105.
[0052]
Next, the heating apparatus used in the plate material manufacturing method according to the present invention will be briefly supplemented with a diagram.
FIG. 15 is a time chart of the heating apparatus according to the present invention.
First, when the plate material approaches the inlet of the heating device, the timers TM1 and TM2 start counting (indicated by a wavy line) in response to a signal from the work carry-in detector 128. Then, the first to seventh relays L1 to L7 are sequentially turned on by the time-up signals of the timer TM1, and the seven ball screw units 131 (motors 132) of the heat source moving unit 103 are sequentially operated to heat the heating unit 102. Move.
[0053]
On the other hand, the first to seventh relays L1 to L7 are sequentially turned OFF by the time-up signals of the timer TM2, and the seven ball screw units 131 (motors 132) of the heat source moving means 103 are stopped in order, and the heating means 102 Stops. Therefore, the heat source moving means 103 can be controlled by the control means 27 based on the heating conditions.
In this manner, the heating means 102 provided to be movable in the direction orthogonal to the transport direction (X-axis direction) (Y-axis direction) is moved in accordance with the first and second differential thickness portions 83 and 136 of the plate material 137. Can be made.
[0054]
FIG. 16 is a graph showing an example of a set temperature used in the plate material manufacturing method according to the present invention, in which the horizontal axis is the first to seventh radiation sources 121 to 127 and the vertical axis is the temperature. The horizontal axis indicates time, the two-dot chain line indicates a chart of a predetermined annealing temperature, Tv indicates a heating rate, T1 indicates a holding temperature, and Km indicates a holding time.
[0055]
The set temperature of the first radiation source 121 is Th1, and this temperature Th1 is a temperature under the atmosphere in the vicinity of the first radiation source 121, and the output is set so that the atmosphere becomes the temperature Th1. The set temperatures of the second to seventh radiation sources 122 to 127 are Th2 to Th7, and the respective outputs are similarly set.
[0056]
That is, since the first, third, fifth, and seventh radiation sources 121, 123, 125, and 127 have a small near-infrared radiation output, the temperature of the thin first differential thickness portion 83 is not increased excessively. The temperature of the thin first differential thickness portion 83 can be increased while substantially matching the temperature increase rate Tv.
On the other hand, since the second, fourth, and sixth radiation sources 122, 124, and 126 have a large near-infrared radiation output, the temperature of the thick second differential thickness portion 136 can be raised, and the temperature rise rate Tv in FIG. The temperature of the thick second differential thickness portion 136 can be raised while matching.
[0057]
Further, the set temperatures of the first and third radiation sources 121 and 123 are Th1 <Th3, and the set temperatures of the second and fourth radiation sources 122 and 124 are Th2 <Th4. Can be secured.
Furthermore, by setting the set temperatures of the fifth and seventh radiation sources 125 and 127 to Th5 and Th7 and slightly lowering the temperature with respect to Th3, the temperature of the thin first differential thickness portion 83 can be kept constant at T1. .
Similarly, by setting the set temperature of the sixth radiation source 126 to Th6 and slightly lowering the temperature with respect to Th4, the temperature of the thick second differential thickness portion 136 can be kept constant at T1.
[0058]
FIGS. 17A and 17B are graphs comparing the annealing temperatures, and show an example.
(A) is a comparative example, which is a copy of FIG. 19 (b), and shows a temperature chart of a plate material annealed by a conventional plate material manufacturing method. The temperature T2 of the difference thickness part 142 of the thickness t2 shown in the measurement part B is higher than the temperature T1 of the difference thickness part 143 of the thickness t3 shown in the measurement part C. In addition, the temperature of the plate material 141 having a thickness t1 that does not require annealing rises to T3.
[0059]
(B) is an Example and shows the temperature chart of the board | plate material annealed with the manufacturing method of the board | plate material of this invention.
As is apparent from the graph, the temperature of the first differential thickness portion 83 having the thickness t2 shown in the measurement portion B is T4, which substantially matches the temperature T1 of the second differential thickness portion 136 having the thickness t3 shown in the measurement portion C. . Moreover, the temperature of the non-rolled part 81b with the thickness t1 shown in the measurement part A is T5, which is lower than the temperature T3.
Therefore, in the manufacturing method of the board | plate material of this invention, the dispersion | variation in the temperature of the board | plate material 137 which shape | molded the 1st, 2nd difference thickness part 83,136 can be made small, and the 1st, 2nd difference thickness part 83,136 is reduced. The formed plate material 137 can be adjusted to a plate material having uniform material characteristics.
Further, the heating temperature of the non-rolled portion 81b can be lowered, and the plate material 137 formed with the first and second differential thickness portions 83 and 136 can be adjusted to a plate material having more uniform material characteristics.
[0060]
Next, another embodiment of the plate material manufacturing method according to the present invention will be described.
FIG. 18 is a graph showing another embodiment of FIG. 17B, and the same components as those of the embodiment shown in FIG.
Here, the temperature of the first differential thickness portion 83 is changed. That is, by changing the heating conditions of the first differential thickness portion 83, the heating device 14 (see FIG. 5) sets the first differential thickness portion 83 to, for example, a temperature increase rate of Tv1, a holding temperature of T6, The holding time can be annealed to Km1, and more advanced temperature management can be performed. Accordingly, the plate material 137 formed with the first and second differential thickness portions 83 and 136 can be adjusted to a plate material that is annealed and has uniform material characteristics, and the first and second differential thickness portions 83 and 136 are formed. Desired material characteristics can be given to the plate material 137.
[0061]
In addition, the temperature of FIG.17 (b) shown in embodiment of this invention and FIG. 18 is an example.
The heat source of the heating means 102 in FIG. 5 is not limited to the near infrared rays of the first to seventh radiation sources, but may be induction heating.
After the strip is cut, the plate is rolled by the rolling device 12, but conversely, the plate may be separated from the strip by the cutting machine 11 after rolling. In that case, the arrangement position of the cutting machine 11 is changed.
Although the heating device 14 is heated while conveying the plate material, the plate material can be stopped and heated.
[0062]
Sealing means such as a door may be attached to the entrances 109 and 108 of the heating device 14 so as to be openable and closable.
Although not shown in the heating device 14, a cooling means may be provided in order to avoid an increase in the temperature of the equipment.
Pushing means may be provided on the transport table 13 and the plate material may be carried into the heating device 14 fully automatically.
[0063]
【The invention's effect】
The present invention exhibits the following effects by the above configuration.
In claim 1, a plate material setting step for setting a plate material between upper and lower rolls of a rolling means, a gripping step for gripping both ends of the set plate material, a tension applying step for applying a constant tension to the gripped plate material, and a tension The difference thickness part forming step of turning the rolling means, setting the axis of the upper and lower rolls non-perpendicular to the longitudinal direction of the plate material, and rolling the upper and lower rolls to form the difference thickness part, And an annealing process in which the formed plate material is continuously sent to a heating device provided in the conveyance line, and the difference thickness portion of the plate material is heated to a predetermined temperature while the plate material is sent in the heating device.
In the annealing process, the thickness difference portion of the plate material is heated to a predetermined temperature while feeding the plate material in the heating device, so that a temperature difference due to the thickness of the difference thickness portion hardly occurs and variation in the temperature of the plate material can be reduced. . Therefore, the plate material formed with the differential thickness portion can be adjusted to a plate material that is annealed and has uniform material characteristics.
[0064]
Moreover, in the annealing process, since the formed plate material is continuously sent to the heating device provided in the conveyance line, the conveyance time between the processes can be extremely shortened, and it takes time to set up the annealing of the plate material having the differential thickness portion. It does not take. Therefore, it is possible to improve the production efficiency of the plate material formed with the differential thickness portion.
[0065]
In claim 2, since the annealing step is performed by annealing to the non-rolled part simultaneously with the heating to the differential thickness part, the differential thickness part can be easily heated under a predetermined temperature condition. The material characteristics of the formed plate material can be made more uniform.
[Brief description of the drawings]
FIG. 1 is a plan view of a plate manufacturing apparatus used in a plate manufacturing method according to the present invention.
FIG. 2 is a side view of a plate manufacturing apparatus used in a plate manufacturing method according to the present invention.
FIG. 3 is a perspective view of a tension device used in the plate manufacturing method according to the present invention.
FIG. 4 is a perspective view of rolling means used in the plate manufacturing method according to the present invention.
FIG. 5 is a perspective view of a heating device used in the plate manufacturing method according to the present invention.
6 is a sectional view taken along line 6-6 in FIG.
FIG. 7 is a flowchart of a plate manufacturing method according to the present invention.
FIG. 8 is a first explanatory view of a method for manufacturing a plate material according to the present invention.
FIG. 9 is a second explanatory view of the plate manufacturing method according to the present invention.
FIG. 10 is a third explanatory view of the plate material manufacturing method according to the present invention.
FIG. 11 is a fourth explanatory diagram of a method for manufacturing a plate material according to the present invention.
FIG. 12 is a fifth explanatory view of the plate material manufacturing method according to the present invention.
FIG. 13 is a sixth explanatory view of the plate material manufacturing method according to the present invention.
FIG. 14 is a seventh explanatory view of the plate material manufacturing method according to the present invention.
FIG. 15 is a time chart of the heating apparatus according to the present invention.
FIG. 16 is a graph showing an example of a set temperature used in the plate manufacturing method according to the present invention.
FIG. 17 is a graph comparing annealing temperatures.
FIG. 18 is a graph showing another embodiment.
FIG. 19 is a diagram showing heating of a conventional plate material
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 14 ... Heating apparatus, 60 ... Rolling means, 64 ... Upper roll (work roll), 66 ... Lower roll (work roll), 81 ... Plate material before rolling, 81b ... Non-rolling part, 82 ... Both ends (thickness) Meat part), 83 ... first difference thickness part, 136 ... second difference thickness part, t ... tension, T1 ... predetermined temperature.

Claims (2)

A plate material setting step for setting a plate material between upper and lower rolls of the rolling means, a gripping step for gripping both ends of the set plate material, a tension applying step for applying a constant tension to the gripped plate material, The rolling means is swiveled, the axis of the upper and lower rolls is set non-perpendicular with respect to the longitudinal direction of the plate material, and the differential thickness portion forming step of rolling with the upper and lower rolls to form the differential thickness portion, and the formed plate material A method for producing a plate material, comprising: an annealing step in which a difference thickness portion of the plate material is heated to a predetermined temperature while being continuously sent to a heating device provided in the conveying line and the plate material is sent in the heating device. 2. The method for manufacturing a plate material according to claim 1, wherein in the annealing step, the heating to the non-rolled portion is interrupted simultaneously with the heating to the differential thickness portion.

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