JP2002192234A - Processing apparatus for deep bending steel plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a processing apparatus for deep bending a steel plate capable of enhancing work efficiency. SOLUTION: The apparatus has a press mechanism 3 for exerting pressure on a steel plate K and a high frequency induction heating coil 4a for heating the steel plate K. Furthermore they have position adjusting mechanisms movable along the plane direction of the steel plate. An operator inputs a set value that commands in what shape the steel plate K is to be deep drawn in a controlling computer in advance. The apparatus is operated based on the set value to actuate a press machine at the optimum pressing position as well as to feed a high frequency induction heater at the optimum heating position, thereby bending the steel plate into a desired form.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel plate deep bending apparatus for deep bending a steel plate used as, for example, a hull shell plate into a desired bent shape.

[0002]

2. Description of the Related Art An outer plate of a hull is made of a steel plate having a complicated non-developable curved surface and having a thickness of about 10 to 30 mm in order to reduce the propulsion resistance and efficiently navigate in water. In order to process the bent outer plate, a method is generally employed in which a steel plate is first subjected to cold bending by using a press machine, and then the steel plate is heated and corrected. In this modified bending process, the surface of the steel sheet is locally heated using a gas burner, and the out-of-plane angular deformation and in-plane shrinkage deformation of the steel sheet due to the plastic strain generated at that time are skillfully used to achieve the target. It is used in many shipyards. The heating conditions such as the heating position and the heating time at this time depend on the intuition of the operator.

[0003]

As described above, in the prior art, the heating point and other heating conditions are determined on the basis of the intuition of the worker for many years. About 5 years or more of experience is required to have the ability to appropriately determine the heating point and other heating conditions involved in such work, which has led to the problem of aging and shortage of skilled technicians. Further, in addition to the bending work itself being a heavy work, all the work is performed manually by the operator, so that there is a problem that work efficiency is poor and the work takes a lot of time.

[0004] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a steel plate deep bending apparatus capable of improving work efficiency.

[0005]

The present invention employs the following means in order to solve the above-mentioned problems. That is, the steel sheet deep bending apparatus according to claim 1 of the present invention is an apparatus for deep bending a steel sheet, and a press mechanism for applying a pressing force to the steel sheet, and a high frequency induction heating source for induction heating the steel sheet. And characterized in that:

According to the steel plate deep bending apparatus of the first aspect, it is possible to improve the processing speed and the processing accuracy for the following reasons. (1) Improvement of processing speed; heating by high-frequency induction heating has a higher heating rate for heating the temperature of a steel sheet to a predetermined temperature as compared with a conventional gas burner. Thereby, the moving speed (heating processing speed) when heating while moving along the surface of the steel sheet can be made higher than before. (2) Improvement of processing accuracy: As described above, since the moving speed of the heated portion can be increased, it is possible to reduce as much as possible the heat transmitted from the heated portion to the surroundings. Thereby, the heating portion can be mainly heated and the influence on other portions can be suppressed, so that the processing accuracy can be improved.

The steel plate deep bending apparatus according to a second aspect of the present invention is the steel sheet deep bending apparatus according to the first aspect, further comprising: a press position adjusting mechanism for moving the press mechanism along a surface direction of the steel sheet; A heating position adjusting mechanism for moving the induction heating source along a surface direction of the steel plate.

[0010] According to the steel plate deep bending apparatus of the second aspect, an arbitrary position of the steel plate can be pressed by driving the press position adjusting mechanism to move the press mechanism. Further, by driving the heating position adjusting mechanism to move the high frequency induction heating source, it is possible to heat an arbitrary position of the steel plate.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION A steel plate deep bending apparatus according to the present invention comprises:
For example, the present invention is an apparatus for deep bending a steel plate used as a hull shell to a desired bending shape, and an embodiment thereof will be described below with reference to the drawings. However, the present invention is limited to this. Of course it is not. FIG. 1 is a side view of the steel plate deep bending apparatus of the present embodiment, and FIG.
It is the plane sectional view seen from the line.

As shown in FIGS. 1 and 2, the deep steel plate bending apparatus according to the present embodiment comprises a base 1 installed on a floor f,
Four support bases 2 for supporting the steel plate K on the base 1, 2,.
, A press mechanism 3 supported above the base 1, and a high-frequency induction heating mechanism 4 for induction-heating a heated portion of the steel plate K on each support 2,. . In addition, the present apparatus is also provided with auxiliary devices such as a power supply device and a transformer, but these are omitted in the figure.

The base 1 has a quadrangular shape in plan view, and includes a pedestal 1a installed on the floor f, and four columns 1b,. A frame 1c having a quadrangular frame shape in plan view supported on each upper end of the column 1b is provided. Each support 2,
Is a roller 2a directly in contact with the steel plate K;
The roller support portion 2c is provided with a roller rotatable around its axis 2b, and a position adjusting portion (not shown) for adjusting the position of the roller support portion 2c. And
Each roller supporting portion 2c is, when viewed in a plan view shown in FIG.
The position can be adjusted in an arbitrary horizontal direction (X direction and Y direction in the figure) along the upper surface of the pedestal 1a of the base 1 by driving the position adjustment unit. Thereby, the supporting steel plate K
Is adjusted to an appropriate size according to the size of the support bases 2,... So that the steel plate K can be supported at four points.

The press mechanism 3 is a device for applying a pressing force by a press to the steel plate K supported on each of the support tables 2,... And is supported so as to be relatively movable in the horizontal direction with respect to the frame 1c. Moving part 3a (press position adjustment mechanism)
And a hydraulic press 3b supported and fixed to the moving section 3a. The moving section 3a is a mechanism for moving the hydraulic press 3b of the press mechanism 3 in the horizontal direction along the upper surface of the steel plate K. For example, an electric type using a combination of an electric motor and a ball screw or a hydraulic type using a hydraulic cylinder is used. As shown in FIG. 2, the position of the hydraulic press 3b can be adjusted in an arbitrary horizontal direction (X direction and Y direction in FIG. 2) along the upper surface of the base 1a of the base 1 by a driving force such as an expression.

The hydraulic press 3b is a press device for applying a point load to the upper surface of the steel plate K. The hydraulic press 3b is driven up and down by hydraulic pressure with respect to the hydraulic cylinder 3b1 and the hydraulic cylinder 3b1. And a press 3b2 for applying a press load in the directional direction. Therefore, according to the moving part 3a and the hydraulic press 3b, after the hydraulic press 3b is moved to a desired position on the upper surface of the steel plate K, the hydraulic cylinder 3
b is driven to lower the press 3b2 to press the steel sheet K to perform the deep bending of the steel sheet K.

The high-frequency induction heating mechanism 4 includes a plurality of support bases 2,.
A device for induction-heating a heated portion of the steel plate K supported thereon, a water-cooled high-frequency induction heating coil 4a (high-frequency induction heating source) for induction-heating an arbitrary portion of the steel plate K, and the high-frequency induction heating coil 4a And a manipulator 4b (heating position adjusting mechanism) for moving the tip along the upper surface of the steel sheet K while holding the tip at the tip. Although not shown, a transformer for supplying a high-frequency current to the high-frequency induction heating coil 4a, a power supply for supplying power to the transformer, operation control of the manipulator 4b, and high-frequency induction heating A control computer, which is a control device that controls the output of the coil 4a (controls the amount of heating of the steel sheet K), and a cooling air spray gun that blows cooling air to the heated steel sheet K to cool it. The high-frequency induction heating mechanism 4 is disposed at a position for heating the upper surface of the steel plate K, but is not limited to this, and heats the lower surface of the steel plate K as shown by a two-dot chain line in FIG. It may be arranged at a position.

The steps of deep bending by the steel plate deep bending apparatus described above will be described below. First, steel plate K
In advance, the operator inputs in advance into the control computer how deep bending is to be performed, and by driving the position adjusting unit, the pitch interval between the support bases 2,. After the adjustment, the steel plate K is placed on these. Thereafter, in accordance with an instruction from the control computer, the moving section 3a moves so as to dispose the press 3b2 right above the place to be pressed on the upper surface of the steel plate K. Subsequently, the hydraulic cylinder 3b1 is activated based on an instruction from the control computer, and the press 3b2 is lowered to press the pressing point P of the steel sheet K downward.

At the same time, the manipulator 4b is driven by the high-frequency induction heating coil 4a based on an instruction from the control computer.
Is induction-heated along the upper surface of the steel plate K. The output of the high-frequency induction heating coil at this time is adjusted so that a heating amount based on a previously input output is given to the steel sheet K while a gap between the coil and the upper surface of the steel sheet K is kept constant. Has been done. The heating by the high-frequency induction heating coil 3b may be performed immediately before the pressing by the press 3b2, or may be performed simultaneously with the pressing by the press 3b2.

The steel sheet K softened by the heating of the high-frequency induction heating coil 3b2 is easily bent and deeply bent by the pressing force of the press 3b2. After being bent into a predetermined shape, cooling air from the cooling air spray gun is blown against the heated portion to cool instantaneously. Thereafter, the high-frequency induction heating coil 4a and the press 3b2 are retracted from the pressing point P, thereby completing the deep bending.

According to the steel plate deep bending apparatus of the present embodiment described above, it is possible to improve the processing speed and the processing accuracy for the following reasons. (1) Improvement of processing speed; heating by high-frequency induction heating has a higher temperature rising rate for heating the temperature of the steel sheet K to a predetermined temperature as compared with a conventional gas burner. Thereby, the moving speed (heating processing speed) when heating while moving along the upper surface of the steel plate K can be made higher than before. (2) Improvement of processing accuracy; as described above, the moving speed of the heated portion can be increased, so that the transfer of heat from the heated portion to the surroundings can be reduced as much as possible. Thereby, the heating portion can be mainly heated and the influence on other portions can be suppressed, so that the processing accuracy can be improved. According to the above (1) and (2), both the improvement of the processing speed and the improvement of the heating accuracy can be obtained, so that the improvement of the working efficiency can be achieved.

The high-frequency induction heating coil 4a uses a steel plate K
Heating the steel sheet K with relatively little pressing force
Can be deeply bent, so that the press mechanism 3 itself can be reduced in size, and the cost of the apparatus can be reduced. In addition, by heating the steel sheet K with the high-frequency induction heating coil 4a, the plastic deformation region on the steel sheet K is widened and springback can be suppressed, so that improvement in bending accuracy can be expected. Furthermore, since the high-frequency induction heating coil 4a that can adjust the heating amount by controlling the current is adopted as a heating source for heating the steel sheet K, the heating temperature can be easily and accurately controlled.

Further, according to the steel sheet bending apparatus of the present embodiment, the moving section 3a for moving the press mechanism and the manipulator 4b for moving the high frequency induction heating coil 4a are provided, so that the steel sheet K can be formed into a desired shape. The optimum press position and heating position for bending can be pressurized by the press 3b2 or heated by the high-frequency induction heating coil 4a.

In this embodiment, the cooling of the steel sheet K is performed as follows.
It was done by blowing cooling air,
However, the present invention is not limited to this, and it is a matter of course that other cooling fluids such as spraying cooling water may be sprayed onto the heated portion to cool the heating portion.

[0022]

According to the steel plate deep bending apparatus according to the first aspect of the present invention, a high frequency induction heating source for induction heating the steel sheet is provided in addition to the press mechanism for applying a pressing force to the steel sheet. Thereby, both the improvement of the processing speed and the improvement of the heating accuracy can be obtained, so that the improvement of the working efficiency can be achieved. In addition, by heating the steel sheet with a high-frequency induction heating source, the steel sheet can be deeply bent with relatively little pressing force, so that the press mechanism itself can be downsized and the cost of the apparatus can be reduced. Become. Further, since a high-frequency induction heating source capable of adjusting a heating amount by current control is adopted as a heating source for heating the steel sheet, it is possible to easily and accurately control the heating temperature.

According to the second aspect of the present invention, the steel plate bending apparatus is provided with a press position adjusting mechanism for moving the press mechanism and a heating position adjusting mechanism for moving the high frequency induction heating source. The optimal pressing position and heating position for bending into a shape can be pressurized by a press machine or heated by a high-frequency induction heating source.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of a steel sheet deep bending apparatus according to the present invention.

FIG. 2 is a cross-sectional view of the steel plate deep bending apparatus as viewed from line AA in FIG.

FIG. 3 is a partial side view showing a modification of the steel plate deep bending apparatus.

[Explanation of symbols]

 3 ... Press mechanism 3a ... Moving part (press position adjusting mechanism) 4a ... High frequency induction heating coil (high frequency induction heating source) 4b ... Manipulator (heating position adjusting mechanism) K ... Steel plate

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takayuki Kono 5-717-1 Fukahori-cho, Nagasaki-city, Nagasaki Pref. Sanishi Heavy Industries Co., Ltd. No. 717 No. 1 Mitsuishi Heavy Industries, Ltd.Nagasaki Research Laboratory (72) Inventor Hiroshi Iwabuchi 1-1, Akunouracho, Nagasaki City, Nagasaki Prefecture Mitsubishi Heavy Industries, Ltd.Nagasaki Shipyard (72) Inventor Kazuaki Ota No. 1-1, Machi Nagashi Shipyard, Mitsubishi Heavy Industries, Ltd. F-term (reference) 4E063 AA01 BA02 CA03 DA02 FA01 GA01 KA04 KA09 LA02 MA30

Claims (2)

[Claims] An apparatus for deep bending a steel sheet, comprising: a press mechanism for applying a pressing force to the steel sheet; and a high-frequency induction heating source for induction heating the steel sheet. Processing equipment. 2. The steel plate deep bending apparatus according to claim 1, wherein the press mechanism is configured to move the press mechanism along a surface direction of the steel sheet, and the high frequency induction heating source is moved in a surface direction of the steel sheet. A deep bending apparatus for a steel sheet, comprising: a heating position adjusting mechanism for moving the steel sheet along the sheet.