JPS58182805A - Automatic demagnetizer - Google Patents

Abstract

PURPOSE:To provide an automatic demagnetizer capable of automatically demagnetizing a ring member of large diameter which is composed of a demagnetizing means, a rotating means which causes the demagnetizing means in demagnetizing condition to move away, a moving means and a control means for controlling those means. CONSTITUTION:A member A to be demagnetized is mounted on a rotating means 3 and a demagnetizing cycle start signal S1 is given to a control means 5. Based on signal S1, the control means 5 sends an approach command signal S2 to a moving means 2 and causes a demagnetizing means 1 to move to a demagnetizing position directly below the member A to be demagnetized. Based on a detection signal S3 from a limit switch (not shown), the control means 5 sends out in order a rotation command signal S4 to the rotating means 3 and an operation command signal S5 to the demagnetizing means 1 and demagnetization is started. Based on a time passage signal S6 from a timer (e), the control means 5 sends out a move-away command signal S7 to the moving means 2 and causes the demagnetizing means 1 to move back to its initial position. Based on a detection signal from a limit switch, the control means 5 sends out stop command signals S9, S10 to the demagnetizing means 1 and rotating means 3 respectively, and a series of demagnetization cycle is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic demagnetizing device, and particularly to an automatic demagnetizing device suitable for demagnetizing large and medium-sized ring-shaped members.

When parts with residual magnetism are welded with an electron beam, it is known that this magnetism causes a beam deflection phenomenon, causing the beam irradiation position to deviate from the groove, resulting in so-called misalignment. Parts are before welding 1
It is normal for the magnet to be completely demagnetized.

As a demagnetizing device for this purpose, as shown in FIGS. 5(a) to 5(c), the member to be demagnetized (A) is placed on a movable trolley 111, and the demagnetized member (A) is placed in a horseshoe-shaped AC demagnetizing machine (12). A device is known in which demagnetization is performed simply by passing the magnet through the inside.

However, in this demagnetizing device, the member to be demagnetized (A) needs to pass inside the AC demagnetizer (12), so if the size of the member to be demagnetized (A) becomes large, the Therefore, the coil of the AC demagnetizer (12) must also be made large, which has the disadvantage that the device itself becomes expensive.

In addition, when the member to be demagnetized is a large-diameter ring member, instead of using the horseshoe-shaped demagnetizer described above, as shown in Figure 6, the fixed number of the ring member (13) is used. It is also known that demagnetization can be carried out by winding a cabtyre circle around the cabtyre Oa and passing a current that decreases in continuous pulses from a demagnetizing DC power supply qω to the cabtyre Oa, as shown in Fig. 7. In case 1, the shape of the ring member (13) becomes large, and therefore a sufficient demagnetizing effect cannot be obtained unless the current applied to the cabtire is increased, for example, to several thousand amperes. A large DC power source (15) for demagnetization is required to demagnetize the ring member (13) of the same diameter, which causes problems in that the device becomes large and expensive.

The present invention was made to eliminate the above-mentioned drawbacks of conventional devices, and provides an automatic demagnetizing device that can automatically demagnetize a large diameter ring member by using a small AC demagnetizing machine. This is what I am trying to do.

Embodiments of the present invention will be described in detail below with reference to the drawings.

First, Figure 1 shows a first embodiment of the present invention. In Figure 1, (1) is a demagnetizing means, and in this case, a small AC demagnetizing coil is used. . The demagnetizing means (1) is placed on a moving cart serving as a moving means (2), so that it can be moved back and forth once in the direction of the arrow in the figure. (3) is a rotating means,
In the case shown in the figure, it consists of a pair of rotating rollers that are supported by a frame body (not shown) and rotate in the same direction, and a ring member as a demagnetized member (A) is placed on the second side of the rollers. The member is configured to perform rotational movement. Note that (4) is a base frame that supports the moving means (2), a lower part of the base frame (which is the demagnetizing means), and a controller that controls each operation of the moving means (2) and the rotating means (3). ] Means (5) are provided.

Next-best Sequence for demagnetizing using the above-mentioned automatic demagnetizing device (I will explain the trick. Fig. 2 is a block diagram of the sequence. First, the member to be demagnetized (A) is placed on the rotating means (3). control means (5) for controlling the demagnetization cycle start signal (St);
I'll give you this. The control means (5) sends a proximity command signal (S2) to the moving means (2) using this signal (S]), and moves the demagnetizing means (1) to a demagnetizing position directly below the member to be demagnetized (A). . This position is detected by a limit switch (not shown). Then, based on this detection signal (Ss), the control means (5) sequentially uses the rotation command signal (S4) of the rotation means (3) and the operation command signal (Ss) of the demagnetization means (1). Start magnetism. The demagnetization time is set by a timer, and a time elapsed signal (S6) from the timer sends a separation command signal (S,) from the control means (5) to the moving means (2), and the demagnetizing means (1) is activated. Retract to initial position. This position is also detected by a limit switch (not shown). Then, this detection signal (Ss) t is transmitted from the control means (5) to a stop command signal (Ss) for the demagnetizing means (1).
, ) and a stop command signal (Sho) for the rotating means (3) are issued to complete the series of demagnetizing cycles.

Note that the above sequence can be partially changed, but if the member to be demagnetized (A) is a ring member, then the sequence is changed while the demagnetized part (A) is still rotating. The part of separating the demagnetizing means (1) in operation from the member to be demagnetized (A) is an essential sequence.

Using the above equipment and sequence, with dimensions of 500 mm in diameter and 100++ rm in width, the residual magnetism after machining was 30 ~
When demagnetizing a ring member for a hydraulic motor having a power of 50 Gauss, it was possible to demagnetize the ring member to 3 to 5 Gauss, which is suitable for electron beam welding, in about 2 minutes after the start of demagnetization. The AC demagnetizing coil used was a small one with a width of 100m, a length of 100m, and a height of 60mm, and the frequency was 60Hz.
commercial frequency.

FIGS. 3(a) and 3(b) show a second embodiment of the present invention, in which the rotating means (3) is a rotary member capable of horizontally placing a ring member serving as a demagnetized member (A). A table is used, and a demagnetizing means (1) is disposed near the outer peripheral surface of the ring member, and other parts and their sequence are the same as those of the first embodiment.

Using this device and the above sequence, a diameter of 2000 m
When we demagnetized a large-diameter ring member with dimensions of 200 +++++++ width and 30 Gauss of residual magnetism after machining, it was possible to demagnetize it to less than 3 Gauss in about 10 minutes of demagnetization time. We were able to electron beam weld two sets of ring members. The width of the AC demagnetizing coil used was 20
It was possible to cover the entire 200 mm width of the ring member.

A third embodiment of the present invention is shown in FIGS. 4(a) and 4(b), in which the member to be demagnetized (A) is placed horizontally on a rotary table, and the demagnetizing means (1) is A rotating arm is used as the moving means (2), and the rotation of this rotating arm causes the tip of the rotating arm to attach and demagnetize the member (1) to be demagnetized.
The outer rigid part of A) (this is made to approach and move away from each other, and the sequence is almost the same as that of the first embodiment. With this device, a large diameter ring similar to that of the second embodiment) can be produced. The member could be demagnetized.

Although typical embodiments of the present invention have been described above, when the diameter of the ring portion that becomes the member to be demagnetized (A) changes, it is possible to In the second and third embodiments, this problem is dealt with by adjusting the center position of the rotary table, respectively. Note that instead of rotating the demagnetized member (A) using the rotation means (3) as described above, the demagnetized member (A) is rotated by the demagnetized member (A).
) may be rotated along one axis, or the transportation means (
In accordance with 2), instead of moving the demagnetizing means (1), the demagnetized member (A) may be moved to bring the two closer together or away from each other. The demagnetized member (A) in the above automatic demagnetizing device is not limited to a ring member, for example, a disc may be demagnetized, and in this case (in this case, the demagnetizing means ( 1) Continuous demagnetization is performed by moving the disk one turn outward from the center of the disk in a spiral manner.

The automatic demagnetizing device of the present invention is configured as described above, and therefore, a large demagnetizing member (A) can be demagnetized using a small demagnetizing means (1), for example, an AC demagnetizing coil. Since it is possible to perform
It will also be inexpensive.

Furthermore, if you set the demagnetization time using a timer, you can use a timer to set the demagnetization time, making it even more practical if the material is difficult to demagnetize. It is.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the first embodiment of the present invention seen from the front;
FIG. 2 is a block diagram showing the sequence of the automatic demagnetization cycle in the above embodiment, and FIGS. 3(a) and 3(b) are diagrams showing the second embodiment of the present invention. The explanatory diagram I saw,
(1)) is an explanatory diagram seen from the front, FIGS. 4(a) and 4(b) are diagrams showing the third embodiment of the present invention, and (a) is an explanatory diagram seen from the plane; (1)) is an explanatory diagram seen from the front, Fig. 5 (a)
) (b) and (c) are explanatory diagrams showing the conventional example, in which (a) is a front view, (b) is a plan view, and (C) is a view from the side.
Fig. 6 is an explanatory diagram showing another conventional example, and Fig. 7 is an explanatory diagram showing the current waveform used in the conventional example shown last time. Means of transportation, (3
) indicates a rotating means, (5) a control means, and (A) a demagnetized member, respectively. Figure 2

Claims (1)

[Claims] 1. a demagnetizing means, a rotating means for relatively rotating the demagnetizing means and the demagnetized member, a moving means for relatively moving the demagnetizing device and the demagnetized member toward and away from each other, and the demagnetizing means In the state of relative rotation between the means and the member to be demagnetized, when demagnetization is performed by the adjacent demagnetizing means, this state also occurs.
An automatic demagnetizing device comprising: a control means for controlling at least a rotating means and a moving means so as to separate the demagnetizing means in an activated state.