JP2020190549A - Magnetization device - Google Patents

Abstract

To provide a magnetization device capable of obtaining sufficient magnetization performance even in a long material in which the size of a cross section and the position of a cross sectional center are different depending on a longitudinal position.SOLUTION: A magnetizing device 100 comprises a plurality of magnetization coils 1 arranged side by side along a longitudinal direction of a long material S1 and having a dimension of being capable of inserting the entire length of the long material, and a driving means 2 that moves the plurality of magnetization coils in an arbitrary direction in a plane orthogonal to the longitudinal direction of the long material. The driving means moves the plurality of magnetization coils so that when viewed from the longitudinal direction of the long material, mutually overlapping regions 12 inside a magnetization coil group 10 composed of N (N≥2) magnetization coils arranged continuously out of the plurality of magnetization coils approach cross sections Sa, Sb of a portion of the long material at the position where the magnetization coil group is arranged.SELECTED DRAWING: Figure 1

Description

The present invention relates to a magnetization device that can be used for magnetic particle flaw detection / leakage flux flaw detection and induction heating of long materials such as steel pipes, steel bars, axles, and crankshafts. In particular, the present invention relates to a magnetization device capable of obtaining sufficient magnetization performance even for a long material in which the size of the cross section and the position of the center of the cross section differ depending on the position in the longitudinal direction.

Conventionally, the magnetic particle flaw detection method and the leakage flux flaw detection method have been applied as quality assurance techniques for long materials such as steel pipes, steel bars, axles, and crankshafts.
The magnetic particle flaw detection method and the leakage magnetic flux flaw detection method are methods in which a long material is magnetized and a flaw is detected by a leakage magnetic flux leaking from a flaw existing in the long material to the outside. In the magnetic particle inspection method, a magnetic powder liquid in which magnetic particles having fluorescent characteristics are dispersed is sprayed on a long material, and the magnetic powder aggregated by the leakage magnetic flux is irradiated with ultraviolet rays to emit fluorescence, and the obtained magnetic powder pattern is visually or imaged. Detects that cannot be observed with. In the leakage magnetic flux flaw detection method, the leakage magnetic flux cannot be detected by a magnetic sensor such as a Hall element.

In the magnetic particle flaw detection method and the leakage flux flaw detection method, as a magnetization device for magnetizing a long material, a magnetizing device provided with a magnetization coil for inserting a long material, which is also called a penetrant coil, is widely used (for example, Patent Documents). See 1 and 2). By energizing the magnetizing coil with a direct current or an alternating current, a magnetic field is formed along the longitudinal direction of the long material, and the long material is magnetized by this magnetic field.

As the magnetizing coil, it is necessary to use a coil having a size capable of inserting the entire length of the long material. Specifically, when the long material is a steel pipe or steel bar, if the magnetizing coil is a circular coil, it is necessary to use a magnetized coil having an inner diameter larger than the outer diameter of the steel pipe or steel bar. Further, when the long material is an axle whose cross-sectional outer diameter differs depending on the position in the longitudinal direction, if the magnetizing coil is a circular coil, it is necessary to use a magnetizing coil having an inner diameter larger than the maximum outer diameter of each cross section of the axle. There is. Further, when the long material is a crankshaft in which the size of the cross section and the position of the center of the cross section differ depending on the position in the longitudinal direction, if the magnetizing coil is a circular coil, each cross section of the crankshaft is projected in the longitudinal direction. It is necessary to use a magnetized coil having an inner diameter large enough to surround the.

Therefore, when the long material is an axle or a crankshaft, the filling rate of the magnetized coil (cross-sectional area of the long material at the position where the magnetized coil is placed / the area inside the magnetized coil) is found in the part where the cross-sectional dimension is small. ) Decreases, which may reduce the magnetization performance and the flaw detection performance. Further, even when the long material is a steel pipe or steel bar, when magnetizing steel pipes or steel bars having different outer diameters with magnetizing coils of the same size, the same problem occurs for steel pipes or steel bars having a small outer diameter.

Further, a magnetizing device provided with a magnetizing coil through which a long material is inserted is also used for induction heating of a long material (see, for example, Patent Document 3).
In the induction heating method, an alternating current is applied to the magnetizing coil to form an alternating magnetic field along the longitudinal direction of the long material, and this alternating magnetic field generates an eddy current in the long material, and the eddy current causes the long material to be long. This is a method of heating the material.
When the long material is induced and heated, the magnetization performance is lowered and the heating performance is lowered due to the decrease in the filling rate of the magnetizing coil, as in the case of magnetic particle flaw detection or leakage flux flaw detection of the long material. There is a risk of

Patent Documents 1 to 3 describe, in particular, a means for solving a decrease in magnetization performance due to a decrease in the packing rate of a magnetizing coil for a long material having a different cross-sectional size and cross-sectional center position depending on the position in the longitudinal direction. No suggestions have been made about.

JP-A-3-223668 Japanese Unexamined Patent Publication No. 7-103942 JP-A-2016-219371

The present invention has been made to solve the above-mentioned problems of the prior art, and it is possible to obtain sufficient magnetization performance even for a long material in which the size of the cross section and the position of the center of the cross section differ depending on the position in the longitudinal direction. An object of the present invention is to provide a magnetizing device capable of performing the same.

In order to solve the above-mentioned problems, the present invention comprises a plurality of magnetizing coils arranged side by side along the longitudinal direction of the long material and having dimensions capable of inserting the entire length of the long material, and the plurality of magnetizing coils. A driving means for moving in an arbitrary direction in a plane orthogonal to the longitudinal direction of the long member is provided, and the driving means is among the plurality of magnetized coils when viewed from the longitudinal direction of the long member. The overlapping regions inside the magnetized coil group consisting of N (N ≧ 2) magnetized coils arranged continuously form a cross section of the portion of the long member at the position where the magnetized coil group is arranged. Provided is a magnetizing device characterized in that the plurality of magnetizing coils are moved so as to approach each other.

According to the present invention, a group of magnetized coils composed of N (N ≧ 2) magnetized coils arranged continuously among a plurality of magnetized coils when viewed from the longitudinal direction of a long member by a driving means. The plurality of magnetized coils will move so that the internal overlapping regions of the magnetized coils approach the cross section of the portion of the long member at the position where the magnetized coils are arranged. In other words, when viewed from the longitudinal direction of the long material, the overlapping regions inside the magnetized coil group (the regions that overlap each other among the internal regions of the magnetized coils constituting the magnetized coil group) are the long materials. The inner surface of each magnetizing coil constituting the magnetizing coil group approaches the outer surface of the long member so as to be slightly larger than the cross section of the above. Therefore, the filling rate (the cross-sectional area of the long material at the position where the magnetized coil group is arranged / the area of the overlapping region inside the magnetized coil group) is based on the mutually overlapping region inside the magnetized coil group. By increasing it, it is possible to obtain sufficient magnetization performance. According to the present invention, since a plurality of magnetizing coils can be moved in an arbitrary direction in a plane orthogonal to the longitudinal direction of the long member by the driving means, the size of the cross section and the center of the cross section are determined by the position in the longitudinal direction. Even for long materials at different positions, the overlapping regions inside the magnetized coil group can approach the cross section of the long material, and the filling rate based on the overlapping regions increases, resulting in sufficient magnetization. It is possible to obtain performance.
According to the present invention, since sufficient magnetization performance can be obtained, there is no possibility that the flaw detection performance will be deteriorated when used for magnetic particle flaw detection and leakage flux flaw detection of a long material. Further, when it is used for induction heating of a long material, there is no possibility that the heating performance is deteriorated.
In the present invention, "having a size that allows the entire length of the long material to be inserted" means that the size of the internal region of the magnetizing coil is larger than the cross section of any part of the total length of the long material. To do. For example, when the magnetizing coil is a circular coil, the inner diameter of the circular coil is larger than the distance between any two points constituting the outer edge of the cross section with respect to the cross section of any part in the total length of the long material. It means that.
Further, the magnetizing coil group of the present invention may be one set or a plurality of sets. When there are a plurality of sets of magnetizing coil groups, the driving means is a cross section of a long member portion at a position where each magnetizing coil group is arranged so that the overlapping regions inside each magnetizing coil group are arranged for each magnetizing coil group. A plurality of magnetizing coils constituting each magnetizing coil group will be moved so as to approach each other.
Further, in the present invention, it is preferable that the magnetization device includes a plurality of magnetizing coils of three or more, and the magnetization coil group is composed of three or more (that is, N ≧ 3) magnetizing coils arranged continuously.

Preferably, when the driving means is viewed from the longitudinal direction of the long material, the driving means of the long material is such that the center of each magnetizing coil constituting the magnetizing coil group is a position where the magnetizing coil group is arranged. Each of the magnetized coil groups is formed in a direction divided at substantially equal angles in the circumferential direction of the long member according to the number of magnetized coils constituting the magnetized coil group from a state corresponding to the center of the cross section of the portion. Move the magnetizing coil.

According to the above preferred configuration, if the long member has a circular cross section and each magnetizing coil is a circular coil having the same dimensions, the overlapping regions inside the magnetizing coil group after being moved by the driving means are circular. It can be made into a similar shape. Therefore, it is possible to sufficiently increase the filling rate and further enhance the magnetization performance.

In the present invention, the magnetized coil may be a one-turn coil or a multi-turn coil. When the magnetizing coil is a multi-turn coil, the multi-turn magnetizing coils constituting the magnetizing coil group are simply arranged side by side along the longitudinal direction of the long member (along the longitudinal direction of the long member). It is also possible to arrange them so that they do not overlap with each other). However, when the magnetized coils with multiple turns are simply arranged side by side, the length of the magnetized coils (dimensions along the longitudinal direction of the long material) becomes larger than when the magnetized coils with one turn are arranged side by side. .. Focusing only on the region corresponding to the length of each magnetized coil, the filling rate of the magnetized coil does not increase in that region. Therefore, if the magnetized coils of multiple turns are simply arranged side by side, the magnetization performance may deteriorate. ..

Therefore, each of the plurality of magnetizing coils is a coil wound a plurality of times, and it is preferable that the magnetizing coils constituting the magnetizing coil group have portions overlapping with each other along the longitudinal direction of the long member.

According to the above-mentioned preferable configuration, the filling rate of the magnetizing coil is increased at the portion overlapping with each other along the longitudinal direction of the long member, so that the magnetization performance can be sufficiently improved.
In order for the magnetizing coils to have overlapping portions along the longitudinal direction of the long material, a structure is provided in which a gap is provided between the conducting wires of the magnetizing coil, and the conducting wire of the other magnetizing coil is positioned between the conducting wires of one magnetizing coil. Each magnetizing coil may be arranged so as to do so.
In the above preferred configuration, "having overlapping portions" is not limited to the case where all the magnetizing coils constituting the magnetizing coil group have overlapping portions, and at least in the longitudinal direction of the long member. It means that a pair of magnetizing coils adjacent to each other have a portion overlapping with each other. For example, when there are three magnetizing coils constituting the magnetizing coil group, all three magnetizing coils may have a portion that overlaps with each other, or a portion where the first and second magnetizing coils overlap each other. It may be an embodiment having a portion in which the second and third magnetizing coils overlap.

Preferably, the transport means for transporting the long material relative to the plurality of magnetized coils in the longitudinal direction is provided, and the driving means is such that the transport means conveys the long material relative to the longitudinal direction. In the process of doing so, the plurality of magnetizing coils are moved.

According to the above-mentioned preferable configuration, the plurality of magnetized coils move in the process in which the transporting means relatively transports the long material in the longitudinal direction by the driving means. In other words, depending on the size of the cross section of the part of the long material that sequentially reaches the position where the magnetized coil group is arranged and the position of the center of the cross section, the overlapping regions inside the magnetized coil group approach the cross section. In addition, each magnetizing coil constituting the magnetizing coil group moves in sequence.
According to the above preferred configuration, it is possible to magnetize the entire length of the long member with one set of magnetizing coil groups.

Preferably, the driving means moves the plurality of magnetizing coils after the long member is inserted into all of the plurality of magnetizing coils.

According to the above preferred configuration, for example, after a long material is inserted through all of the plurality of magnetized coils with the centers of the plurality of magnetized coils aligned, they overlap each other inside the magnetized coil group by a driving means. A plurality of magnetizing coils will move so that the region to be magnetized approaches the cross section of the portion of the long member at the position where the magnetizing coil group is arranged.
According to the above preferred configuration, the number of magnetized coil groups required is larger than that of the above preferred configuration (a configuration in which a plurality of magnetizing coils are moved in the process of relatively transporting a long member in the longitudinal direction). Although it increases, it has the advantage that it is easy to control the movement of the magnetizing coil.

Here, when the long material is, for example, a crankshaft, the crankshaft is conveyed to a predetermined pedestal installation position and magnetized while being mounted on the pedestal to detect magnetic particles or leakage magnetic flux. Is often done. If the installation position of the pedestal is fixed, the vertical position and longitudinal orientation of the crankshaft mounted on the pedestal are considered to be stable as long as the crankshafts have the same specifications. , The position of the crankshaft in the longitudinal direction and the angle around the longitudinal direction may differ for each crankshaft even if the crankshafts have the same specifications. Therefore, when the crankshaft is in a predetermined reference position (reference vertical position, reference longitudinal orientation, reference longitudinal position and reference longitudinal angle), the magnetizing coil Depending on the cross-sectional shape at each longitudinal position of the crankshaft and the dimensions of the magnetizing coil so that the overlapping regions inside the group approach the cross section of the part of the crankshaft at the position where the magnetizing coil group is located. Even if the moving direction and the amount of movement of each magnetizing coil constituting the magnetizing coil group are determined in advance, if the position in the longitudinal direction of the crank shaft and the angle around the longitudinal direction deviate from the reference position, each of the determined magnetizing coils There is a risk that the moving direction and amount of movement will be inappropriate. In the above description, the case where the long material is a crankshaft has been taken as an example, but the length is magnetized while being placed on a pedestal or the like, and the position in the longitudinal direction and the angle around the longitudinal direction may vary. This is a problem common to scale materials.

In order to solve the above problem, preferably, when the long member is in the reference position, the driven means is arranged with the magnetized coil group in a region overlapping each other inside the magnetized coil group. The moving direction and the amount of movement of each magnetizing coil constituting the magnetizing coil group, which is determined to approach the cross section of the portion of the long material at the above position, are stored in advance, and the long material is magnetized. Further, the driving means further includes a detecting means for detecting the amount of displacement of the long member in the longitudinal direction with respect to the reference position and the deviation angle of the elongated member in the longitudinal direction with respect to the reference position. Based on the stored movement direction and movement amount of each magnetizing coil and the positional deviation amount and deviation angle of the long member detected by the detection means, the actual movement direction and movement amount of each magnetizing coil are determined. After determining, each of the magnetized coils is moved.

In the above preferred configuration, the "reference position" means a reference vertical position, a reference longitudinal orientation, a reference longitudinal position and a reference longitudinal angle. The "amount of displacement of the long material in the longitudinal direction with respect to the reference position" means an amount of displacement of the long material in the longitudinal direction with respect to a reference position in the longitudinal direction. "The deviation angle of the long material around the longitudinal direction with respect to the reference position" means the deviation angle of the long material around the longitudinal direction with respect to the reference angle around the longitudinal direction.
According to the above preferred configuration, the detection means detects the amount of displacement of the long material in the longitudinal direction with respect to the reference position and the angle of deviation of the elongated material with respect to the reference position in the longitudinal direction. Therefore, the driving means is the stored moving direction and moving amount of each magnetizing coil (when the long member is in the reference position, the overlapping region inside the magnetizing coil group is the position where the magnetizing coil group is arranged. The moving direction and the amount of movement of each magnetizing coil constituting the magnetizing coil group determined to approach the cross section of the part of the long material in Based on the above, the actual moving direction and moving amount of each magnetizing coil can be determined. In other words, when the long member is in the reference position, the appropriate moving direction and moving amount of each magnetizing coil (moving direction and moving amount of each magnetizing coil stored in advance in the driving means) are detected by the detecting means. Corrected based on the amount of misalignment and the misalignment angle of the long material, and appropriate for each position of the long material (position in the longitudinal direction and angle around the longitudinal direction) when actually magnetizing. The moving direction and the amount of movement of the magnetizing coil can be determined. Then, the driving means moves each magnetizing coil based on the determined actual moving direction and moving amount of each magnetizing coil, so that even if the long material deviates from the reference position, the filling rate is increased. It is possible to obtain sufficient magnetization performance.

Preferably, the long material is a crank shaft, and the magnetizing coil group is composed of three magnetizing coils, a first magnetizing coil, a second magnetizing coil, and a third magnetizing coil, and is a counter weight of the crank shaft. The cross section is approximated by a quadrangle, and of the four sides of the quadrangle, three sides are set as the first side, the second side, and the third side in order from the longest side, and the magnetizing coil group is arranged on the counter weight. In this case, the driving means moves the first magnetizing coil so that the first magnetizing coil is close to both ends of the first side, so that the second magnetizing coil is close to both ends of the second side. The second magnetizing coil is moved to the surface, and the third magnetizing coil is moved so that the third magnetizing coil is close to both ends of the third side.

When the long material is a crankshaft, the cross section of the counterweight of the crankshaft can often be approximated by a quadrangle such as a trapezoid. According to the above preferable configuration, the three magnetizing coils (first to third magnetizing coils) constituting the magnetizing coil group are arranged on three sides (first to third) in order from the longest of the four sides of the quadrangle. It is possible to increase the filling rate by moving it so that it is close to both ends of the side).
In the above-mentioned preferable configuration, "moving so as to be close to each other" means that the magnetizing coil is moved so as to be in contact with each other and the magnetized coil is separated from the contacting position by a small distance so as to secure the insulating property. It is a concept that includes both the case of moving to a certain position.

According to the present invention, it is possible to obtain sufficient magnetization performance even for a long material whose cross-sectional size and cross-sectional center position differ depending on the position in the longitudinal direction.

It is a figure which shows typically the schematic structure of the magnetization device which concerns on 1st Embodiment of this invention. It is a figure which shows typically the schematic structure of the magnetization device which concerns on 2nd Embodiment of this invention. It is a figure which shows typically the schematic structure of the detection means included in the magnetization device which concerns on 3rd Embodiment of this invention. It is a figure which shows typically the schematic structure of the detection means included in the magnetization device which concerns on 3rd Embodiment of this invention. It is a figure which shows typically the schematic structure of the modification of the detection means provided in the magnetization device which concerns on 3rd Embodiment of this invention. It is a front view explaining the moving direction and the moving amount of each magnetizing coil when the magnetizing coil group which concerns on 3rd Embodiment of this invention is arranged in the counterweight of a long material. It is a figure which shows typically the preferable structure of the magnetizing coil group when the magnetizing coil is a multi-turn coil. It is a figure which shows the condition and the result which evaluated the effect of this invention by the simulation by the finite element analysis.

Hereinafter, the magnetization device according to the embodiment of the present invention will be described with reference to the accompanying drawings as appropriate.

<First Embodiment>
FIG. 1 is a diagram schematically showing a schematic configuration of a magnetization device according to the first embodiment of the present invention. FIG. 1A is a side view showing the entire magnetization device 100 as viewed from a direction (Y direction) orthogonal to the longitudinal direction (X direction) of the long member S1 (in the example shown in FIG. 1 the axle for a railroad vehicle). Is. FIG. 1B is a front view showing one state of the magnetized coil group 10 seen from the longitudinal direction of the long member S1. FIG. 1C is a front view showing the magnetized coil group 10 in another state as seen from the longitudinal direction of the long member S1.

As shown in FIG. 1, the magnetizing device 100 according to the first embodiment includes a plurality of magnetizing coils 1 (three magnetizing coils 1a, 1b, 1c in the example shown in FIG. 1). Each magnetized coil 1 shown in FIG. 1 is a one-turn circular coil and has the same dimensions as each other. The plurality of magnetizing coils 1 are arranged side by side along the longitudinal direction of the long member S1 and have a size capable of inserting the entire length of the long member S1. Specifically, since the long member S1 shown in FIG. 1 is an axle whose cross-sectional outer diameter differs depending on the position in the longitudinal direction, the inner diameter D2 of the magnetizing coil 1 is the maximum outer diameter D1 of each cross section of the long member S1. Is bigger than. Then, as shown in FIG. 1A, in the initial state, the center (central axis) of the long member S1 and the center (central axis) of the plurality of magnetizing coils 1 are in a state of matching.

Each magnetizing coil 1 is connected to a power source (not shown), and a direct current or a synchronized alternating current flowing in the same direction (clockwise or counterclockwise) is energized from the power source to each magnetizing coil 1. To. When the magnetizing device 100 is used for magnetic particle flaw detection / leakage magnetic flux flaw detection of the long material S1, a direct current or an alternating current is applied to each magnetizing coil 1, and when it is used for induction heating, a direct current is applied to each magnetizing coil 1. Is energized. The power source may be provided for each magnetizing coil 1 (that is, three power sources may be provided), or each magnetizing coil 1 may be connected in series and one power source may be connected to both ends thereof. When a power source is provided for each magnetized coil 1 and an alternating current is applied to each magnetized coil 1, a synchronization circuit for synchronizing the output of each power source is provided.
A support rod 11 is attached to each magnetized coil 1 of the first embodiment, and each magnetized coil 1 is supported by the drive means 2 (2-axis stage 21) described later by the support rod 11. ..

The magnetization device 100 according to the first embodiment includes a driving means 2 for moving a plurality of magnetizing coils 1 in an arbitrary direction in a plane (YZ plane) orthogonal to the longitudinal direction of the long member S1.
In the driving means 2 of the first embodiment, the biaxial stage 21 in which the other end of the support rod 11 to which one end is attached to each magnetizing coil 1 is attached to a movable portion (not shown) and the biaxial stage 21 are electrically connected. The computer 22 is connected to the computer 22 and has a program for driving the 2-axis stage 21 installed.

The biaxial stage 21 has a fixed portion (not shown) and a movable portion (not shown) that moves with respect to the fixed portion. The two-axis stage 21 moves the movable portion in the two-axis directions of the Y direction and the Z direction with respect to the fixed portion in response to the control signal transmitted from the computer 22. By controlling the amount of movement in the Y direction and the Z direction, the support rod 11 attached to the movable portion and the magnetizing coil 1 attached to the support rod 11 move in an arbitrary direction in the YZ plane.

The computer 22 has a shape (cross section size (outer diameter) of the long member S1 and a cross section in the YZ plane orthogonal to the longitudinal direction of the long member S1) at each position in the longitudinal direction. The position) and the dimensions of the magnetized coil 1 are stored in advance. The computer 22 calculates an appropriate movement direction and movement amount of each magnetizing coil 1 in the YZ plane according to the stored cross-sectional shape of the long member S1 and the dimensions of the magnetizing coil 1, and calculates this as a control signal. Is transmitted to the 2-axis stage 21.

Further, the magnetization device 100 according to the first embodiment includes a conveying means (not shown) for conveying the long member S1 relative to a plurality of magnetizing coils 1 in the longitudinal direction (direction of arrow V). .. As the transporting means, a transport roller or the like that transports the long material S1 in the longitudinal direction with respect to the magnetizing coil 1 that is stationary (stationary in the longitudinal direction of the long material S1), or a stationary long material S1. On the other hand, a uniaxial stage or the like in which the magnetizing coil 1 is moved in the longitudinal direction of the long member S1 can be exemplified.
The relative transfer speed of the long member S1 is measured by a predetermined sensor (for example, an encoder attached to a transfer roller) (not shown) and input to the computer 22.

Hereinafter, the operation of the magnetization device 100 according to the first embodiment having the above configuration will be described.
In the first embodiment, the driving means 2 moves the plurality of magnetizing coils 1 in the process in which the conveying means conveys the long member S1 relatively in the longitudinal direction. Specifically, until the tip of the long member S1 (the end on the downstream side in the transport direction of the long member S1; the right end in FIG. 1A) reaches the position where the magnetizing coil 1 is arranged by the conveying means. In the meantime, the driving means 2 starts the movement of the plurality of magnetizing coils 1 in the initial state, the long member S1 is inserted into the magnetizing coil 1, and the rear end of the long member S1 (the transport direction of the long member S1). The drive means 2 moves the plurality of magnetized coils 1 at the timing when the portions having different outer diameters of the cross section arrive until the upstream end (the left end in FIG. 1A) comes out of the magnetized coil 1. Let me. Similarly, energization of a direct current or an alternating current to the plurality of magnetizing coils 1 is started until the tip of the long member S1 reaches the position where the magnetizing coil 1 is arranged, and the rear end of the long member S1. Continues until is removed from the magnetized coil 1.

More specifically, when viewed from the longitudinal direction of the long member S1, the driving means 2 includes three or more magnetized coils 1 (example shown in FIG. 1) that are continuously arranged among the plurality of magnetized coils 1. Then, the region 12 that overlaps each other inside the magnetizing coil group 10 composed of the three magnetizing coils 1a, 1b, 1c) approaches the cross section of the portion of the long member S1 at the position where the magnetizing coil group 10 is arranged. A plurality of magnetizing coils 1 are moved. The magnetized coil group 10 of the first embodiment is a set of magnetized coil groups 10 composed of three magnetized coils 1a, 1b, and 1c.

As shown in FIG. 1B, when the cross section Sa of the portion of the long member S1 having the maximum outer diameter reaches the position where the magnetizing coil group 10 is arranged, the driving means 2 uses the magnetizing coil group 10 The magnetizing coils 1a, 1b, and 1c constituting the above are moved to the positions in the initial state where their centers are aligned. As a result, the region (the region hatched in FIG. 1B) 12 inside the magnetized coil group 10 that overlaps with each other is the cross section Sa of the portion of the long member S1 at the position where the magnetized coil group 10 is arranged. Will approach.

On the other hand, as shown in FIG. 1C, when the cross section Sb of the portion of the long member S1 having an outer diameter smaller than the cross section Sa reaches the position where the magnetized coil group 10 is arranged, the driving means 2 , The magnetizing coils 1a, 1b, and 1c constituting the magnetizing coil group 10 are moved so that the overlapping regions 12 (hatched regions in FIG. 1C) inside the magnetizing coil group 10 become smaller. .. Specifically, the driving means 2 is long at a position where the magnetizing coil group 10 is arranged at the center of each magnetizing coil 1 constituting the magnetizing coil group 10 when viewed from the longitudinal direction of the long member S1. After moving the magnetizing coil group 10 so as to coincide with the center of the cross section Sb of the portion of the material S1, from this state (the state shown by the broken line in FIG. 1C), the magnetizing coil 1 constituting the magnetizing coil group 10 Each magnetizing coil 1 constituting the magnetizing coil group 10 is moved in a direction divided at substantially equal angles in the circumferential direction of the long member S1 according to the number of the members. In the first embodiment, since the number of magnetizing coils 1 constituting the magnetizing coil group 10 is 3, the driving means 2 is provided in the directions of the arrows A, B, and C divided at an angle of approximately 120 °. The magnetizing coils 1a, 1b and 1c will be moved. As a result, the overlapping regions 12 inside the magnetizing coil group 10 approach the cross section Sb of the portion of the long member S1 at the position where the magnetizing coil group 10 is arranged.

As described above, the appropriate moving direction and moving amount of each magnetizing coil 1 are calculated by the computer 22 of the driving means 2. Specifically, the computer 22 is based on the input relative transfer speed of the long member S1 and the shape of the cross section of the long member S1 stored in advance at each longitudinal position. The shape of the cross section of the portion of the long member S1 that reaches the position where 10 is arranged is sequentially calculated, and the appropriate shape of each magnetizing coil 1 is calculated based on the shape of this cross section and the size of the magnetizing coil 1 stored in advance. The movement direction and movement amount are calculated sequentially.

According to the magnetization device 100 according to the first embodiment described above, when viewed from the longitudinal direction (X direction) of the long member S1, the overlapping regions 12 inside the magnetizing coil group 10 are the long member. The inner surface of each magnetizing coil 1 constituting the magnetizing coil group 10 approaches the outer surface of the long member S1 so as to be slightly larger than the cross section of S1.
Therefore, it is possible to obtain sufficient magnetization performance by increasing the filling rate based on the mutually overlapping regions 12 inside the magnetized coil group 10. According to the magnetization device 100 according to the first embodiment, sufficient magnetization performance can be obtained. Therefore, when the long member S1 is used for magnetic particle flaw detection and leakage flux flaw detection, the flaw detection performance may deteriorate. Absent. Further, when it is used for induction heating of the long material S1, there is no possibility that the heating performance is deteriorated.
Further, according to the magnetization device 100 according to the first embodiment, it is possible to magnetize the entire length of the long member S1 with a set of magnetizing coil groups 10.

<Second Embodiment>
Next, the magnetization device according to the second embodiment of the present invention will be described. In the components included in the magnetization device according to the second embodiment, the components having the same functions as the components included in the magnetization device 100 according to the first embodiment are designated by the same reference numerals, and duplicate description is appropriately omitted. Then, mainly the parts different from the first embodiment will be described.
FIG. 2 is a diagram schematically showing a schematic configuration of a magnetization device 100A according to a second embodiment of the present invention. Specifically, FIG. 2 is a side view showing the entire magnetization device 100A seen from a direction (Y direction) orthogonal to the longitudinal direction (X direction) of the long member S2 (crankshaft in the example shown in FIG. 2). is there. FIG. 2A is a side view showing the case where each magnetized coil group 10 is in the initial state. FIG. 2B is a side view showing a state after each magnetizing coil group 10 has moved. In addition, in FIG. 2, the long member S2 is shown in a transparent state. Further, in FIG. 2, unlike FIG. 1, the driving means 2 and the support rod 11 included in the magnetization device 100A are not shown. Further, in FIG. 2, the front view of the long member S2 as viewed from the longitudinal direction is omitted. The magnetized coil group 10 of the second embodiment is also composed of three magnetized coils 1 as in the first embodiment. However, a plurality of sets (9 sets in the example shown in FIG. 2) of the magnetized coil group 10 of the second embodiment are provided.

As shown in FIG. 2, the magnetization device 100A according to the second embodiment also includes a plurality of magnetizing coils 1 (27 magnetizing coils 1 in the example shown in FIG. 2). Each magnetized coil 1 shown in FIG. 2 is a one-turn circular coil and has the same dimensions as each other. The plurality of magnetizing coils 1 are arranged side by side along the longitudinal direction of the long member S2, and have a size capable of inserting the entire length of the long member S2. Specifically, since the long member S2 shown in FIG. 2 is a crankshaft in which the size of the cross section and the position of the center of the cross section differ depending on the position in the longitudinal direction, the inner diameter of the magnetized coil 1 is the cross section of the long member S2. It has a size that can surround the projected cross section projected in the longitudinal direction. Then, as shown in FIG. 2A, in the initial state, the center (central axis) of the long member S2 and the center (central axis) of the plurality of magnetizing coils 1 are in a state of matching.
Each magnetized coil 1 is connected to a power source (not shown), and a direct current or a synchronized alternating current flowing in the same direction is energized from the power source to each magnetized coil 1.
The driving means 2 (not shown) included in the magnetization device 100A according to the second embodiment also includes a two-axis stage 21 (not shown) and a computer 22 (not shown) as in the first embodiment. Since the program for driving the installed 2-axis stage 21 of the computer 22 of the second embodiment is different from that of the first embodiment, the operation of the magnetization device 100A according to the second embodiment is the same as that of the first embodiment. The operation is different from that of the magnetization device 100.

Hereinafter, the operation of the magnetization device 100A according to the second embodiment having the above configuration will be described. In the second embodiment, after the long member S2 is inserted through all of the plurality of magnetizing coils 1, the plurality of magnetizing coils 1 are moved. Specifically, as shown in FIG. 2A, in the initial state where the center of the long member S2 and the center of the plurality of magnetizing coils 1 are aligned, the long member S2 is moved by a conveying means (not shown). It is inserted through all of the plurality of magnetizing coils 1. How much the long member S2 is conveyed in the longitudinal direction by the conveying means can be determined by the length of the long member S2 and the arrangement position of the plurality of magnetizing coils 1.
After that, as shown in FIG. 2B, in the driving means 2 (not shown), when viewed from the longitudinal direction of the long member S2, the regions overlapping each other inside each magnetized coil group 10 are formed. The plurality of magnetized coils 1 are moved so as to approach the cross section of the portion of the long member S2 at the position where each magnetized coil group 10 is arranged.

In the magnetizing device 100A according to the second embodiment, similarly to the magnetizing device 100 according to the first embodiment, the driving means 2 is, for example, the magnetizing coil group 10 when viewed from the longitudinal direction of the long member S2. After moving the magnetizing coil group 10 so that the center of each magnetizing coil 1 constituting the above coincides with the center of the cross section of the portion of the long member S2 at the position where the magnetizing coil group 10 is arranged, the magnetizing coil group 10 is magnetized from this state. Each magnetizing coil 1 constituting the magnetizing coil group 10 is moved in a direction divided at substantially equal angles in the circumferential direction of the long member S2 according to the number of magnetizing coils 1 constituting the coil group 10. Also in the second embodiment, since the number of the magnetizing coils 1 constituting the magnetizing coil group 10 is 3, the driving means 2 decides to move each magnetizing coil 1 in the direction divided at an angle of about 120 °. Become. As a result, the overlapping regions 12 inside the magnetized coil group 10 approach the cross section of the portion of the long member S2 at the position where the magnetized coil group 10 is arranged.

Further, also in the second embodiment, the appropriate moving direction and moving amount of each magnetizing coil 1 are calculated by the computer 22 (not shown) of the driving means 2 (not shown). Specifically, the computer 22 is suitable for each magnetizing coil 1 based on the shape of the cross section of the long member S1 stored in advance at each longitudinal position and the size of the magnetizing coil 1 stored in advance. Calculate the movement direction and movement amount.

Even with the magnetizing device 100A according to the second embodiment described above, when viewed from the longitudinal direction (X direction) of the long member S2, the overlapping regions inside the magnetizing coil group 10 are the long member S2. The inner surface of each magnetizing coil 1 constituting the magnetizing coil group 10 approaches the outer surface of the long member S2 so as to be slightly larger than the cross section.
Therefore, it is possible to obtain sufficient magnetization performance by increasing the filling rate based on the mutually overlapping regions inside the magnetized coil group 10. According to the magnetization device 100A according to the second embodiment, sufficient magnetization performance can be obtained, so that when used for magnetic particle flaw detection and leakage flux flaw detection of the long material S2, the flaw detection performance may deteriorate. Absent. Further, when it is used for induction heating of the long material S2, there is no possibility that the heating performance is deteriorated.
Further, according to the magnetization device 100A according to the second embodiment, although the number of magnetizing coil groups 10 required increases as compared with the magnetization device 100 according to the first embodiment, the long member S2 is relatively relative to the longitudinal direction. Since it is not necessary to move the plurality of magnetized coils 1 in the process of transporting the magnetized coils 1, there is an advantage that the control of moving the magnetized coils 1 is easy.

<Third Embodiment>
Next, the magnetization device according to the third embodiment of the present invention will be described. The magnetization device according to the third embodiment is different from the magnetization device 100A according to the second embodiment in that it includes a detection means. Hereinafter, in the components included in the magnetization device according to the third embodiment, the components having the same functions as the components included in the magnetization device 100A according to the second embodiment are designated by the same reference numerals and will be duplicated. The parts that are different from the second embodiment will be mainly described by omitting them as appropriate.
3 and 4 are diagrams schematically showing a schematic configuration of a detection means 3 included in the magnetization device 100B according to the third embodiment of the present invention. FIG. 3A is a perspective view showing a schematic configuration of the detection means 3, and shows a state in which the long member S3 (crankshaft in the examples shown in FIGS. 3 and 4) is in the reference position. FIG. 3B shows an example of an captured image captured by the imaging means 31 included in the detecting means 3 shown in FIG. 3A. FIG. 4A is a perspective view showing a schematic configuration of the detection means 3, showing a state in which the long member S3 is deviated from the reference position. FIG. 4B shows an example of an captured image captured by the imaging means 31 included in the detecting means 3 shown in FIG. 4A. In addition, in FIGS. 3 and 4, the magnetizing coil group 10 (magnetizing coil 1) (see FIG. 2) and the biaxial stage 21 (see FIG. 1) and the support rod 11 (see FIG. 1) included in the magnetizing device 100B are shown. It is omitted.
The magnetizing coil group 10 included in the magnetizing device 100B according to the third embodiment is also arranged side by side along the longitudinal direction (X direction) of the three magnetizing coils 1 (long member S3) as in the second embodiment. It is composed of a single-turn circular coil having the same dimensions as each other and capable of inserting the entire length of the scale member S3), and a plurality of sets are provided. Each magnetized coil 1 is connected to a power source (not shown), and a direct current or a synchronized alternating current flowing in the same direction is energized from the power source to each magnetized coil 1. Similar to the second embodiment, a program for driving the two-axis stage 21 is installed in the computer 22 included in the driving means 2 of the third embodiment. Further, the computer 22 of the third embodiment also has a program installed for performing image processing on the captured image captured by the imaging means 31 included in the detecting means 3, and also has a function as the detecting means 3. ..

As shown in FIGS. 3 and 4, the magnetization device 100B according to the third embodiment includes a detection means 3. In the example shown in FIGS. 3 and 4, the detecting means 3 includes an imaging means 31 and a computer 22. The imaging means 31 can image one end of the long material S3 (specifically, the journal SJ and the counterweight SC located on the onemost end side of the crankshaft) from the longitudinal direction of the long material S3. It is installed in a suitable position. The computer 22 performs predetermined image processing on the captured image captured by the imaging means 31. Then, when the long member S3 is magnetized (for example, when the long member S3 is at the position shown in FIG. 4A), the detecting means 3 has a reference position (the long member shown in FIG. 3A). It is configured to detect the amount of misalignment Δl of the long member S3 in the longitudinal direction (X direction) with respect to the position of S3) and the deviation angle Δθ around the longitudinal direction of the long member S3 with respect to the reference position. Hereinafter, an example of a method for detecting the displacement amount Δl and the displacement angle Δθ by the detection means 3 will be described.

The long member S3 (crankshaft) is conveyed to the installation positions of the pair of pedestals 4 and 5 by a conveying means such as a conveyor, and is placed on the pedestals 4 and 5. Then, as shown in FIG. 3A, the captured image shown in FIG. 3B captured by the imaging means 31 when the long member S3 is in the reference position is input to the computer 22. The computer 22 has a cross section at each longitudinal position of the long member S3 at the reference position based on the design specifications of the long member S3 (cross section in the YZ plane orthogonal to the longitudinal direction of the long member S3). Shape (size of cross section and position of center of cross section) is stored in advance. The computer 22 extracts, for example, the cross-sectional shape of the counter weight SC from the cross-sectional shapes of the stored long member S3 at each longitudinal position, and the extracted counter from the input captured images. A known image process such as edge detection is performed on a pixel region located near the cross-sectional shape of the weight SC to extract the outer edge of the counter weight SC, and the coordinates of the outer edge of the counter weight SC at the extracted reference position. Remember.
On the other hand, as shown in FIG. 4A, the captured image shown in FIG. 4B captured by the imaging means 31 when the long member S3 is magnetized is input to the computer 22. In the same manner as described above for the case where the long member S3 is in the reference position, the computer 22 refers to, for example, the pixel region located in the vicinity of the cross-sectional shape of the extracted counterweight SC in the input captured image. The outer edge of the counter weight SC is extracted by performing known image processing such as edge detection. Then, based on the coordinates of the outer edge of the extracted counterweight SC and the coordinates of the outer edge of the counterweight SC at the reference position stored as described above, as shown in FIG. 4B, the length with respect to the reference position is long. The deviation angle Δθ around the longitudinal direction of the material S3 is calculated. Specifically, the computer 22 rotates, for example, the outer edge of the counterweight SC at the stored reference position to match the outer edge of the extracted counterweight SC. Then, it is conceivable that the computer 22 specifies the rotation angle of the rotational movement when the highest matching score is obtained as the deviation angle Δθ.

Further, the computer 22 extracts, for example, the cross-sectional shape of the journal SJ from the cross-sectional shapes of the long-length member S3 stored in advance based on the design specifications of the long-length member S3 at each position in the longitudinal direction. Of the captured images shown in 3 (b), the outer edge of the journal SJ is extracted by performing known image processing such as edge detection on the pixel region located near the cross-sectional shape of the extracted journal SJ. The coordinates of the outer edge of the journal SJ at the extracted reference position are stored.
On the other hand, the computer 22 is located near the cross-sectional shape of the extracted journal SJ in the captured image shown in FIG. 4B, for example, in the same manner as described above for the case where the long member S3 is in the reference position. The outer edge of the journal SJ is extracted by performing known image processing such as edge detection on the pixel region to be processed. Then, the size (area) of the end face of the journal SJ obtained from the coordinates of the outer edge of the extracted journal SJ and the size of the end face of the journal SJ obtained from the coordinates of the outer edge of the journal SJ at the reference position stored as described above. Based on (area), the amount of misalignment Δl of the long member S3 in the longitudinal direction with respect to the reference position is calculated. That is, if the position of the long member S3 to be magnetized shifts in the longitudinal direction so as to move away from the imaging means 3, the size of the end face of the journal SJ becomes smaller than the size at the reference position, and the imaging means 3 If the position shifts in the longitudinal direction so as to approach, the size of the end face of the journal SJ becomes larger than the size at the reference position, and the position shift amount Δl can be calculated.

The position shift amount Δl and the shift angle Δθ detected (calculated) as described above are stored in the computer 22.
On the other hand, in the computer 22, when the long member S3 is in the reference position shown in FIG. 3A, the overlapping regions inside the magnetizing coil group 10 are located at the positions where the magnetizing coil group 10 is arranged. The moving direction and the amount of movement of each magnetizing coil 1 constituting the magnetizing coil group 10 determined to approach the cross section of the portion of the long member S3 are stored in advance. The specific contents will be described later.
Then, the driving means 2 (two-axis stage 21 and the computer 22) has the moving direction and the moving amount of each magnetizing coil 1 stored in the computer 22, and the misalignment amount Δl of the long member S3 detected by the detecting means 3. The actual moving direction and moving amount of each magnetizing coil 1 are determined based on the deviation angle Δθ, and each magnetizing coil 1 is moved. In other words, the driving means 2 provides an appropriate moving direction and moving amount of each magnetizing coil 1 when the long member S3 is in the reference position (moving direction and moving amount of each magnetizing coil 1 stored in advance in the computer 22). ) Is corrected based on the displacement amount Δl and the displacement angle Δθ of the long member S3 detected by the detecting means 3, and the position of the long member S3 when actually magnetized (in the longitudinal direction of the long member S3). An appropriate moving direction and moving amount of each magnetizing coil 1 are determined according to the position and the angle around the longitudinal direction. Then, the driving means 2 moves each magnetizing coil 1 based on the determined actual moving direction and moving amount of each magnetizing coil 1. As a result, even if the long member S3 deviates from the assumed reference position, it is possible to increase the filling rate and obtain sufficient magnetization performance.

The operation of the magnetization device 100B according to the third embodiment after the long member S3 is transported to the installation positions of the pair of pedestals 4 and 5 and placed on the pedestals 4 and 5 can be summarized as follows (1). ) ~ (5).
(1) The detection means 3 detects the displacement amount Δl and the displacement angle Δθ of the long member S3.
(2) The fixed clamp 6 is lowered, and the journal located on the other end side (right side of FIG. 4A) of the long member S3 is clamped between the fixed clamp 6 and the pedestal 5.
(3) The pedestal 5 retracts (for example, descends), and the long member S3 is cantilevered and supported by the fixed clamp 6 and the pedestal 5.
(4) One end side (central axis) of the long member S3 in a state where the center (central axis) of each magnetized coil 1 constituting the magnetized coil group 10 and the center (central axis) of the long member S3 are aligned. The long member S3 is inserted into the magnetizing coil group 10 from the left side of FIG. 4A).
(5) The moving direction and the amount of movement of each magnetizing coil 1 stored in advance by the driving means 2 (when the long member S3 is at the reference position, the overlapping regions inside the magnetizing coil group 10 are the magnetizing coils. Detected by the detection means 3 and the moving direction and amount of movement of each magnetizing coil 1 constituting the magnetizing coil group 10 determined to approach the cross section of the portion of the long member S3 at the position where the group 10 is arranged. Based on the positional deviation amount Δl and the deviation angle Δθ of the long member S3, the actual moving direction and moving amount of each magnetizing coil 1 are determined, and the actual moving direction and moving amount of each determined magnetizing coil 1 is obtained. Based on this, each magnetizing coil 1 is moved.

In the third embodiment, if the position of the long member S3 shifts in the longitudinal direction so as to move away from the imaging means 3, the size of the end face of the journal SJ becomes smaller than the size at the reference position, and the imaging means When the detection means 3 detects the misalignment amount Δl by utilizing the fact that the size of the end face of the journal SJ becomes larger than the size at the reference position if the position shifts in the longitudinal direction so as to approach 3. However, the present invention is not limited to this. When it is necessary to detect the amount of misalignment Δl with higher accuracy, it is also possible to detect it by a method using the principle of triangulation.

FIG. 5 is a diagram schematically showing a schematic configuration of a modified example of the detection means 3 included in the magnetization device 100B according to the third embodiment of the present invention. FIG. 5A is a plan view showing a schematic configuration of the detection means 3, showing a state in which the long member S3 is in a reference position. FIG. 5B shows an example of a pixel region corresponding to the journal SJ in the captured image captured by the imaging means 31 included in the detecting means 3 shown in FIG. 5A. FIG. 5C is a plan view showing a schematic configuration of the detection means 3, and shows a state in which the long member S3 is deviated from the reference position. FIG. 5D shows an example of a pixel region corresponding to the journal SJ in the captured image captured by the imaging means 31 included in the detecting means 3 shown in FIG. 5C. The broken line shown in FIG. 5D illustrates the pixel region corresponding to the laser beam L shown in FIG. 5B, and is not actually imaged.
As shown in FIG. 5, the detecting means 3 according to the modified example includes a laser light source 32 in addition to the imaging means 31 and the computer 22 (not shown in FIG. 5). The optical axis of the laser light source 32 is tilted by an angle φ with respect to the visual axis of the imaging means 31, and the emitted laser light L is the end face of the journal SJ (preferably the end face of the journal SJ of the long member S3 at the reference position). It is arranged so that it illuminates the center of the).

As shown in FIG. 5 (a), the computer 22 included in the detection means 3 according to the modified example is captured by the imaging means 31 when the long member S3 is in the reference position as shown in FIG. 5 (a). An captured image including a pixel area is input. The computer 22 performs known image processing such as binarization on the input captured image, extracts a pixel region corresponding to the laser beam L whose brightness value is larger than that of the surroundings, and extracts the extracted laser beam. The coordinates (center coordinates) of the pixel area corresponding to L are calculated and stored.
On the other hand, as shown in FIG. 5C, the captured image shown in FIG. 5D captured by the imaging means 31 when the long member S3 is magnetized is input to the computer 22. The computer 22 performs known image processing such as binarization on the input captured image, extracts a pixel region corresponding to the laser beam L whose brightness value is larger than that of the surroundings, and extracts the extracted laser beam. The coordinates (center coordinates) of the pixel area corresponding to L are calculated. Then, the distance d (see FIG. 5D) between the coordinates of the pixel region corresponding to the extracted laser beam L and the coordinates of the pixel region corresponding to the laser beam L at the reference position stored as described above is set. calculate. Assuming that the distance d is the actual size (the number of pixels corresponding to the distance d × the pixel resolution), as shown in FIG. 5C, the displacement amount Δl can be geometrically calculated by Δl = d / tanφ. Is.

Hereinafter, the moving direction and the moving amount of each magnetizing coil 1 constituting the magnetizing coil group 10 when the long member S3 is in the reference position shown in FIG. 3A, which is stored in advance in the computer 22, will be described.
FIG. 6 is a front view for explaining the moving direction and the moving amount of each magnetizing coil 1 when the magnetizing coil group 10 is arranged on the counterweight SC of the long member S3.
As shown in FIG. 6A, in the initial state, the center (central axis) of the long member S3 and the center (central axis) of each magnetizing coil 1 are aligned. Here, the magnetizing coil 1a is the first magnetizing coil, the magnetizing coil 1b is the second magnetizing coil, and the magnetizing coil 1c is the third magnetizing coil. Further, the cross section of the counter weight SC is approximated by a quadrangle (trapezoid in the example shown in FIG. 6), and three of the four sides of the quadrangle are arranged in order from the longest side, the first side SC1, the second side SC2, and the second side SC2. The third side is SC3 (however, in the example shown in FIG. 6, SC1 = SC2).

From the state shown in FIG. 6A, the driving means 2 moves the first magnetizing coil 1a so that the first magnetizing coil 1a is close to both ends of the first side SC1, and the second magnetizing coil 1b is on the second side. If the second magnetized coil 1b is moved so as to be close to both ends of the SC2 and the third magnetized coil 1c is moved so that the third magnetized coil 1c is close to both ends of the third side SC3, the magnetized coil group 10 It is possible to increase the filling rate based on the areas that overlap each other inside.
As a mode in which the magnetizing coils 1a to 1c are moved so as to be close to both ends of the sides SC1 to SC3, as shown in FIG. 6B, the magnetizing coils 1a to 1c are each of the sides SC1 to SC3. A mode in which the magnetized coils are moved so as to be in contact with both ends, or a mode in which the magnetized coils 1a to 1c are moved to a position slightly away from the contacting position so as to secure the insulating property as shown in FIG. 6 (c). Can be considered. In the case of the embodiment shown in FIG. 6 (c), the magnetized coils 1a to 1c shown in FIG. 6 (b) are separated from each other by a short distance along the direction of the perpendicular bisector of each side SC1 to SC3. You can move it to.

In the computer 22, when the magnetized coil group 10 is arranged on the counter weight SC of the long member S3 at the reference position, each magnetized coil 1 in the initial state shown in FIG. 6 (a) is shown in FIG. 6 (b). The moving direction and the amount of movement of each magnetizing coil 1 required for the state shown in FIG. 6C are stored in advance.
When the magnetized coil group 10 is arranged at a portion having a circular cross section such as the journal SJ of the long member S3, the driving means 2 is divided at an angle of approximately 120 ° as in the second embodiment. Since each magnetizing coil 1 is moved in the direction, the moving direction and the amount of movement of each magnetizing coil 1 required for this are stored in advance.

In the first to third embodiments described above, the case where the magnetizing coil 1 is a one-turn coil has been described as an example, but it is also possible to use a multi-turn coil as the magnetizing coil 1. .. When the magnetizing coil 1 is a coil with a plurality of turns, the magnetizing coils 1 having a plurality of turns constituting the magnetizing coil group 10 are simply arranged side by side along the longitudinal direction of the long members S1 to S3 (long members). It is also possible to arrange them along the longitudinal direction of S1 to S3 so as not to have overlapping portions with each other).
However, preferably, the magnetizing coils 1 constituting the magnetizing coil group 10 are arranged so as to have portions overlapping each other along the longitudinal direction of the long members S1 to S3. Specifically, each magnetizing coil 1 is arranged so that a gap is provided between the conducting wires of the magnetizing coil 1 and the conducting wire of the other magnetizing coil 1 is located between the conducting wires of one magnetizing coil 1.

FIG. 7 is a diagram schematically showing a preferable configuration of the magnetized coil group 10 when the magnetized coil 1 is a multi-turn coil. FIG. 7A is a perspective view showing one state and the other state of the magnetized coil group 10. FIG. 7B is a front view showing one state of the magnetized coil group 10 as seen from the longitudinal direction (X direction) of the long members S1 to S3. FIG. 7C is a front view showing another state of the magnetized coil group 10 seen from the longitudinal direction of the long members S1 to S3. In FIG. 7, the long members S1 to S3 are not shown. As shown in FIG. 7, the three magnetizing coils 1 constituting the magnetizing coil group 10 have portions overlapping each other along the longitudinal direction (X direction) of the long members S1 to S3.

In the state shown on the right side of FIG. 7A and FIG. 7C, the three magnetizing coils 1 are moved to the positions where their centers are aligned. As a result, the regions 12 that overlap each other inside the magnetized coil group 10 become the largest, and it is possible to surround a large portion of the cross section of the long members S1 to S3.
In the state shown on the left side of FIG. 7A and FIG. 7B, the three magnetizing coils 1 are moved so that the overlapping regions 12 inside the magnetizing coil group 10 become smaller. Thereby, it is possible to increase the filling rate of the magnetized coil 1 in the small portion of the cross section of the long members S1 to S3.
According to the preferred configuration shown in FIG. 7, at the portion where the long members S1 to S3 overlap each other along the longitudinal direction, the magnetized coil 1 wound a plurality of times is simply mounted along the longitudinal direction of the long members S1 to S3. Since the filling rate of the magnetizing coils 1 is higher than when they are arranged side by side, it is possible to sufficiently improve the magnetization performance.

In the first embodiment, the axle is taken as an example as the long member S1 to which the magnetization device 100 is applied, but the present invention is not limited to this, and can be applied to a crankshaft. It can also be applied to steel pipes and steel bars. Further, in the second embodiment and the third embodiment, the crankshaft is taken as an example as the long members S2 and S3 to which the magnetization devices 100A and 100B are applied, but the present invention is not limited to this and is applied to the axle. It is also possible to do. It can also be applied to steel pipes and steel bars.

Further, in the first to third embodiments, the case where the magnetizing coil 1 is a circular coil has been given as an example, but the present invention is not limited to this, and a rectangular coil can be used as the magnetizing coil 1. Is.
Further, in the first to third embodiments, the case where the magnetized coil group 10 is composed of three magnetized coils 1 has been described as an example, but the present invention is not limited to this, and the magnetized coil group 10 is not limited to this. Can be composed of four or more magnetized coils 1. It is also possible to configure the magnetized coil group 10 from two magnetized coils 1.

Hereinafter, in the present invention, the plurality of magnetizing coils 1 are provided so as to reduce the overlapping regions inside the magnetizing coil group 10 (so as to approach the cross section of the long member portion at the position where the magnetizing coil group 10 is arranged). An example of the result of evaluating the effect of (moving) by simulation by finite element analysis will be described.

FIG. 8 is a diagram showing the conditions and results of the above simulation. FIG. 8A shows an outline of the model used in the simulation. FIG. 8B shows a contour diagram showing the magnetic flux density of the long material (steel bar) calculated by the simulation using the model shown in FIG. 8A. FIG. 8C shows the magnetic flux density in the cross section of the portion of the long member (center in the longitudinal direction of the long member) at the position where the magnetized coil 1 or the magnetized coil group 10 shown in FIG. 8A is arranged. .. The results calculated by the simulation using the model shown in the left figure of FIG. 8 (a) are shown in the left figures of FIGS. 8 (b) and 8 (c). The results calculated by the simulation using the model shown in the middle figure of FIG. 8 (a) are shown in the middle figures of FIGS. 8 (b) and 8 (c). The results calculated by simulation using the model shown in the right figure of FIG. 8 (a) are shown in the right figures of FIGS. 8 (b) and 8 (c). Note that FIGS. 8 (b) and 8 (c) are actually color-coded according to the magnitude of the magnetic flux density.

In the model shown on the left side of FIG. 8A, the magnetizing coil 1 is a one-turn coil having a length of 72 mm, an outer diameter of 60 mm, and an inner diameter of 40 mm, and the current energizing the magnetizing coil 1 is 1000 A. is there. The magnetomotive force is 1000A x 1 turn = 1000AT. In the model shown in the middle diagram of FIG. 8A, the magnetizing coil 1 is a one-turn coil having a length of 72 mm, an outer diameter of 100 mm, and an inner diameter of 80 mm, and the current energizing the magnetizing coil 1 is 1000 A. is there. The magnetomotive force is 1000A x 1 turn = 1000AT. In the model shown on the right side of FIG. 8A, each magnetized coil 1 is a 6-turn coil having a length of 72 mm, an outer diameter of 100 mm, and an inner diameter of 80 mm, and the current energizing each magnetized coil 1 is increased. It is 55.56A. The magnetizing coil group 10 is composed of three magnetizing coils 1, and the center of each magnetizing coil 1 is arranged with an eccentricity of 35 mm in each direction divided at an angle of 120 ° from the center of the long member. The magnetomotive force is 55.56A x 18 turns = 1000AT. The outer diameter of the long material was 20 mm in all the models shown in FIG. 8 (a).

As a result of simulating under the condition that the magnetomotive force is the same as described above, the magnetic flux density in the cross section of the long member of the model shown in the left figure of FIG. 8 (a) in the longitudinal direction (the left figure of FIG. 8 (c)). ) Is the largest, followed by the magnetic flux density in the cross section of the long member of the model shown in the right figure of FIG. 8 (a) at the center in the longitudinal direction (right figure of FIG. 8 (c)), and FIG. 8 (a). The magnetic flux density (middle figure of FIG. 8C) in the cross section of the long member of the model shown in the middle figure in the longitudinal direction was the smallest.
Therefore, when the magnetizing coils 1 having the same dimensions (outer diameter 100 mm) are used, the regions overlapping each other inside the magnetizing coil group 10 as shown in the right figure of FIGS. 8 (a) to 8 (c). By reducing the size (moving the plurality of magnetized coils 1 so as to approach the cross section of the part of the long material at the position where the magnetized coil group 10 is arranged), the filling rate can be increased and the magnetic flux density can be increased. I understand.

1, 1a, 1b, 1c ... Magnetized coil 10 ... Magnetized coil group 11 ... Support rod 12 ... Areas overlapping each other 2 ... Drive means 21 ... 2-axis stage 22 ... Computer 100, 100A, 100B ... Magnetizing devices S1, S2, S3 ... Long material Sa, Sb ... Cross section

Claims (7)

A plurality of magnetized coils arranged side by side along the longitudinal direction of the long member and having a size capable of inserting the entire length of the long member.
A driving means for moving the plurality of magnetizing coils in an arbitrary direction in a plane orthogonal to the longitudinal direction of the long member is provided.
The driving means are mutually arranged inside a group of magnetized coils composed of N (N ≧ 2) magnetized coils arranged continuously among the plurality of magnetized coils when viewed from the longitudinal direction of the long member. The plurality of magnetized coils are moved so that the overlapping region approaches the cross section of the portion of the long member at the position where the magnetized coil group is arranged.
A magnetizing device characterized by that. When viewed from the longitudinal direction of the long material, the driving means is a cross section of a portion of the long material at a position where the center of each magnetizing coil constituting the magnetizing coil group is arranged. From the state corresponding to the center of the above, each of the magnetizing coils constituting the magnetizing coil group is divided in a direction divided at substantially equal angles in the circumferential direction of the long material according to the number of the magnetizing coils constituting the magnetizing coil group. Move,
The magnetization device according to claim 1, wherein the magnetization device. Each of the plurality of magnetized coils is a coil wound a plurality of times.
The magnetizing coils constituting the magnetizing coil group have portions overlapping each other along the longitudinal direction of the long member.
The magnetization device according to claim 1 or 2, wherein the magnetization device. A transport means for transporting the long material relative to the plurality of magnetized coils in the longitudinal direction is provided.
The driving means moves the plurality of magnetizing coils in the process in which the transporting means relatively transports the long material in the longitudinal direction.
The magnetization device according to any one of claims 1 to 3, wherein the magnetization device is characterized by the above. The driving means moves the plurality of magnetizing coils after the long material is inserted into all of the plurality of magnetizing coils.
The magnetization device according to any one of claims 1 to 3, wherein the magnetization device is characterized by the above. In the driving means, when the long member is in the reference position, the overlapping regions inside the magnetized coil group are cross-sections of the portion of the long member at the position where the magnetized coil group is arranged. The moving direction and the amount of movement of each magnetizing coil constituting the magnetizing coil group determined to approach the above are stored in advance.
Further, a detection means for detecting the amount of displacement of the long material in the longitudinal direction with respect to the reference position when magnetizing the long material and the deviation angle of the long material around the longitudinal direction with respect to the reference position. Prepare,
The driving means actually moves the magnetized coils based on the stored moving direction and moving amount of the magnetized coils and the displacement amount and the shifting angle of the long member detected by the detecting means. The direction and the amount of movement are determined to move each of the magnetized coils.
The magnetization device according to claim 5, characterized in that. The long material is a crankshaft and
The magnetized coil group includes three magnetized coils, a first magnetized coil, a second magnetized coil, and a third magnetized coil.
The cross section of the counter weight of the crank shaft is approximated by a quadrangle, and three of the four sides of the quadrangle are designated as the first side, the second side, and the third side in order from the longest side. Is arranged on the counter weight, the driving means moves the first magnetizing coil so that the first magnetizing coil approaches both ends of the first side, and the second magnetizing coil moves the second magnetizing coil. The second magnetizing coil is moved so as to be close to both ends of the side, and the third magnetizing coil is moved so that the third magnetizing coil is close to both ends of the third side.
The magnetization device according to any one of claims 1 to 6, characterized in that.