JP2013114942A5

JP2013114942A5 -

Info

Publication number: JP2013114942A5
Application number: JP2011261077A
Authority: JP
Filing date: 2011-11-29
Publication date: 2015-01-22
Anticipated expiration: 2031-11-29

Description

上記目的を達成するために、本発明は、一方向に沿う単位長さあたりの抵抗が一方向に沿って変化するような加熱領域を備えたワークを、加熱領域の各部が所定の加熱温度範囲となるように加熱する通電加熱方法であって、一方の電極と他方の電極とを間隔をおいて加熱領域に横断させて配置し、通電状態のまま一方の電極と他方の電極の何れか一方又は双方を移動させることを特徴とする。
上記構成において、一方の電極と他方の電極の何れか一方又は双方の電極の移動方向に従って、短冊状に仮想的に分割した領域毎の熱量を制御する。
上記構成において、一方の電極と他方の電極には、給電部から一定の電流を流す。
ワークの加熱領域は、一方向に断面積が減少する形状を呈しており、その一方向の断面積の減少に応じて一方の電極、他方の電極のうち何れかを移動する。 In order to achieve the above object, the present invention provides a workpiece having a heating region in which the resistance per unit length along one direction changes along one direction, and each part of the heating region has a predetermined heating temperature range. An electrode heating method in which one electrode and the other electrode are arranged across the heating region at an interval, and one of the one electrode and the other electrode is left in an energized state. or wherein the Before moving both.
In the above configuration, the amount of heat for each region virtually divided into strips is controlled in accordance with the moving direction of one or both of the one electrode and the other electrode.
In the above configuration, a constant current is supplied from the power feeding unit to one electrode and the other electrode.
The heating area of the workpiece has a shape in which the cross-sectional area decreases in one direction, and one of the electrodes and the other electrode move according to the decrease in the cross-sectional area in the one direction.

本発明によれば、ワークの加熱すべき領域の一方向に沿う単位長さ当たりの抵抗が左右で変化しており、例えば一方向に断面積が増加又は減少している場合には、左右に一方の電極と他方の電極とを配置して通電状態で一方向に沿う単位長さ当たりの抵抗が増加する方向に少なくとも一つの電極を移動させる。その際、一方向に沿う単位長さ当たりの抵抗の増加に応じて電極の移動速度を調整する。これにより、移動方向に向けて短冊状に仮想的に分割された領域毎の電気量を、各領域によらず同一性のある範囲とする。その結果、例えば断面積が左右方向で異なっている場合など一方向に沿う単位長さ当たりの抵抗が変化している場合であっても、多数の電極対を配置せずに、各領域に加える熱量を等しくすることができ、加熱領域をほぼ均一加熱することができる。 According to the present invention, the resistance per unit length along one direction of the area to be heated of the workpiece changes from left to right. For example, when the cross-sectional area increases or decreases in one direction, One electrode and the other electrode are arranged and at least one electrode is moved in a direction in which the resistance per unit length along one direction increases in an energized state. At that time, the moving speed of the electrode is adjusted in accordance with the increase in resistance per unit length along one direction. Thereby, the electric quantity for each region virtually divided into strips in the moving direction is set to a range having the same identity regardless of each region. As a result, even if the resistance per unit length along one direction is changing, for example, when the cross-sectional areas are different in the left-right direction, a large number of electrode pairs are not arranged and applied to each region. The amount of heat can be made equal, and the heating region can be heated almost uniformly.

例えば図９のように、ワークｗが左方向に厚みが小さくなっている場合においても、移動速度を、上記式４から、断面積の変化率の２乗に比例した関数で規定される。 For example, as shown in FIG. 9 , even when the thickness of the workpiece w is reduced in the left direction, the moving speed is defined by a function proportional to the square of the change rate of the cross-sectional area from the above equation 4.

以上、複数の実施形態を説明したが、本発明は、ワークｗの形状及び寸法に応じて適宜変更して実施することができる。ワークｗは図示した形状に限定されず、ワークｗが、一方向に沿う断面積が小さくなるなどして単位長さ当たりの抵抗が大きくなる領域を含んでいれば、その方向に電極を移動させることによりその領域を均一加熱することができる。なお、ワークｗは、外周辺のうち左右端をつなぐ横辺は直線である必要はなく湾曲していてもよいし、横辺が複数の直線や曲率の異なる曲線をつなげて構成されていてもよい。 While a plurality of embodiments have been described above, the present invention can be implemented with appropriate modifications according to the shape and dimensions of the workpiece w. Workpiece w is not limited to the shape shown, the workpiece w is if it contains a region in which resistance increases per unit by, for example, the cross-sectional area along the one direction becomes smaller length, moving the electrode in that direction Thus, the region can be heated uniformly. Note that the workpiece w may be curved without connecting the left and right edges of the outer periphery, but may be curved, or may be configured by connecting a plurality of straight lines or curves with different curvatures. Good.

Claims

This is an energization heating method in which a workpiece having a heating area is heated so that the resistance per unit length along one direction changes along the one direction so that each part of the heating area falls within a predetermined heating temperature range. And
And one electrode and the other electrode at a distance and arranged to be traversed to the heating area, moving either or both of the left said one electrode and the other electrode of the energized, energization heating method.

The energization heating method according to claim 1, wherein an amount of heat for each region virtually divided into strips is controlled according to a moving direction of either one or both of the one electrode and the other electrode .

The energization heating method according to claim 1, wherein a constant current is supplied from the power feeding unit to the one electrode and the other electrode.

The heating area of the workpiece has a shape in which a cross-sectional area decreases in one direction, and moves one of the one electrode and the other electrode in accordance with a decrease in the cross-sectional area in one direction. The energization heating method according to claim 1.