JPH05329910A - Manufacture of magnet roll - Google Patents

Abstract

PURPOSE:To make the setting of the thickness of covering magnetic material- containing resin to the desired thickness possible by a method wherein the feed speed of shaft and the extruder output of resin are feed-back controlled under the condition that the state of covered magnetic material-contained resin is confirmed visually. CONSTITUTION:By rotating a screw 10 with a driving motor 9, molten magnetic material-containing resin, which is prepared by melting pellets running through a barrel 7 heated with heaters 8, is fed in a die 12, into which a connected shaft body 20 is fed with an inlet side clamp 13. By passing the connected shaft body 20 through the die 12 at a certain speed, the surface of the connected shaft body 20 is covered with magnetic material-containing resin 11. After being cut off with a cutter, the shaft body is disassembled into a shaft 17 and a socket 18. By being magnetically attracted after the disassembling or at the outlet of the die 12, a magnet roll is manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a magnet roll, which is capable of continuously producing a magnet roll by coating the surface of a shaft with a magnetic substance-containing resin having a certain thickness and then magnetically adhering the resin. Regarding

[0002]

2. Description of the Related Art Conventionally, a magnet roll having such a shape has a plate-shaped resin magnet stuck to the shaft surface, or a resin magnet having a shape matched to a magnetic pattern formed and stuck to the shaft surface. Further, the resin magnet extruded in a cylindrical shape was cut into a certain size, and the shaft was inserted later to manufacture.

[0003]

However, in the conventional method, since the resin magnet is manufactured separately and then the shaft and the resin magnet are assembled by using the adhesive, many steps are required, and the cost is reduced. In addition, there is a problem in quality and operation management such as positional deviation between the resin magnet and the shaft.

Therefore, the present invention is capable of continuous operation, is excellent in quality without being affected by adhesives and the like, can be manufactured without damaging the resin magnet, and has a magnetic material of a desired thickness on the shaft surface. It is an object of the present invention to provide a method of manufacturing a magnet roll that can be coated with a contained resin. In the manufacturing process, it is important to coat the surface of the shaft with a magnetic substance-containing resin of a desired thickness.This type of magnet roll has a high quality requirement level for the accuracy of the finished outer diameter of the product. This is because when the body-containing resin has a large thickness, it is necessary to cut it with a precision lathe and further finish polishing the surface with a precision polishing device, which increases the product cost.

[0005]

In order to achieve the above object, in order to coat the resin containing a magnetic substance on the surface of the shaft by feeding the shaft through a die of an extruder and passing it through, the coated magnetic substance is used. A method characterized in that the thickness of the magnetic substance-containing resin to be coated can be set to a desired thickness by performing feedback control with the feed rate of the shaft and the resin extrusion amount as control factors while visually confirming the state of the contained resin. Is.

Further, due to the effects described later, a closed loop control is performed in which a motor is used as a drive source for feeding the shaft, and the feeding speed of the shaft is adjusted while detecting the motor rotation speed to bring the feeding speed of the shaft close to a target value. It is preferable to use a closed loop control in which the resin extrusion rate is brought close to the target value by using the above, or by further adjusting the screw rotation speed while detecting the screw rotation speed in the extruder.

In particular, it is desirable to add the pellet supply amount to the extruder as a control factor.

[0008]

As described above, according to the method for producing a magnet roll of the present invention, while visually confirming the state of the magnetic substance-containing resin coated, the shaft feed rate and the resin extrusion amount are used as control factors, for example, manually. By feeding the shaft through the die of the extruder and passing the die under feedback control, the surface of the shaft can be coated with the magnetic substance-containing resin having a desired thickness.

Further, when the feed rate of the shaft is used as a control factor, a motor is used as a drive source for feeding the shaft, and the feed rate of the shaft is adjusted by detecting the rotation speed of the motor to adjust the feed rate of the shaft. This can be achieved by closed loop control that brings the speed closer to the target value.

When the resin extrusion rate is used as a control factor, the screw rotation rate is adjusted while detecting the screw rotation rate in the extruder to achieve the resin extrusion rate in a closed loop control approaching the target value. can do.

Further, in the case of controlling the pellet supply amount to the extruder by adding it to the control factor, the pellet supply amount to the extruder can be feedback-controlled manually, for example, to change the resin extrusion amount. Can be made.

[0012]

The details of the present invention will be described with reference to the embodiments shown in the drawings. First, an outline of a magnet roll manufacturing apparatus will be described with reference to FIG. The magnet roll manufacturing apparatus A is composed of an extrusion molding machine 1 and a moving means 2 as shown in FIG.

The extrusion molding machine 1 supplies a fixed amount of pellets to a fixed quantity feeder 3 as shown in FIG. 1, and measures the weight of the remaining pellets in the fixed quantity feeder 3 with a platform scale 4 while driving a vibrator 5 with a driving motor 6 It is supplied into the barrel 7 while being oscillated by the heater, heated by the heater 8 in the barrel 7 to melt the pellet, and the screw 10 is rotated by the drive motor 9 to feed the melted magnetic substance-containing resin 11 into the die 12. Of. Here, the extrusion amount Q into the die 12 is: Q = (π ² NDH (D−H) tanΦ · tanα) /
(TanΦ + tanα). In the above equation, Q: extrusion amount, Φ: movement angle,
N: screw rotation speed, α: flight inclination angle, H: groove depth, D: screw diameter. That is, the extrusion amount Q is proportional to the screw rotation speed N.

Next, the moving means 2, as shown in FIG. 1, has clamps 13 on the inlet side and the outlet side of the die 12 of the extruder 1.
14 are arranged facing each other, one by one,
More specifically, on the inlet side, for example, a clamp 13 in which an AC motor 15 (AC motor) and a chain 16 are related to each other supplies the shaft 17 and supports the shaft 17 while supporting it.
By moving the inside of the die 12, the surface of the shaft 17 is coated with the magnetic substance-containing resin 11, and similarly the shaft 17 is supported on the outlet side, and the shaft 17 coated with the magnetic substance-containing resin 11 is moved. It is possible to manufacture a resin coating roll containing a magnetic material.

Here, the chattoft 17 has a bearing portion 17b, which is a small diameter portion, at both ends of a cylindrical shaft body 17a as shown in FIG.
The socket 18 has a length approximately twice the length of the bearing portion 17b, and an outer diameter of the shaft main body 17a having a through hole 19 into which the bearing portion 17b can be fitted. It has a cylindrical shape having an outer diameter substantially the same as that of. This chattoft
17 and the socket 18 are fitted in order to form the connection shaft body 20, and the shuttle shaft 17 and the socket 18 are sequentially fed to be fitted and moved, and the surface of the chattoft 17 can be coated with the magnetic material-containing resin 11. Of. Then, as shown in FIG. 1, the single unit 21 in which the socket 18 is fitted only to one end of the chattoft 17 is sent to the connecting shaft body 20 by the clamp 13 and the entire connecting shaft body 20 is moved in the die 12 to contain the magnetic substance. The resin 11 is coated.

Further, at the entrance side of the die 12, the clamp 1
By installing 3 and 13 facing each other, one clamp 13 supports and feeds the connecting shaft body 20, and the other clamp 13 holds the single unit 21 and waits, and these two movements are performed. The clamps 13 are alternately repeated. Further, on the outlet side of the die 12, by installing the clamps 14, 14 facing each other, one clamp 14 supports the connecting shaft body 20 and moves according to the movement of the connecting shaft body 20, and the other clamp 14 moves. 14
Is waiting.

When manufacturing a magnet roll, as shown in FIG. 1, a fixed amount of pellets is supplied to the fixed quantity feeder 3, and the remaining amount of the pellets in the fixed quantity feeder 3 is weighed by a base 4
While measuring the weight with the vibrator, the vibrator 5 is oscillated by the drive motor 6 and fed into the barrel 7. The barrel 7 is heated by the heater 8 to melt the pellets, and the screw 10 is driven by the drive motor 9 (inverter motor). The molten magnetic substance-containing resin is rotated to feed into the die 12, and the connecting shaft body 20 is fed into the die 12 by the inlet side clamp 13, so that the connecting shaft body 20 is fed at a constant speed in the die 12. By passing it, the surface of the connecting shaft body 20 is coated with the magnetic substance-containing resin 11, and after being separated by cutting with a cutter (not shown), the chattoft 17 and the socket 18 are disassembled, and after that or at the outlet of the die 12, magnetic attachment By doing so, a magnet roll can be manufactured. Further, the control method at this time is based on the PI operation for feeding back the shaft feed speed to the target value by feeding back while detecting the motor rotation speed of the motor 15 for driving the inlet side clamp 13 as shown in FIGS. Closed loop control,
By detecting the rotation speed of the screw 10 in the extrusion molding machine 1 and feeding it back to adjust the screw rotation speed, the resin extrusion rate (extrusion speed) approaches the target value.
Closed loop control by operation, closed loop control by PI operation that feeds back pellet supply amount while measuring the weight of the quantitative feeder 3 and approaches the target value, the operator visually inspects the coating state of the magnet roll,
The thickness of the magnetic substance-containing resin 11 coated in the die 12 of the extrusion molding machine 1 can be made as close as possible to the target value by manually adjusting the feed rate of the shaft, the screw rotation rate, and the pellet supply amount in sequence. Of. That is, FIG.
When the rotation speed of the drive motor 15 is increased, the feed speed of the shaft is increased, and the thickness of the magnetic substance-containing resin 11 coated on the chattoft 17 can be reduced, and when the screw rotation speed is increased, the resin extrusion amount is increased. As a result, the magnetic substance-containing resin 11 coated on the chattoft 17 can be made thicker, and if the weight of the pellets is further increased, the pellet supply amount is increased and the resin extrusion amount is increased.

Of these, the feed rate of the shaft and the screw rotation rate are major control factors in adjusting the thickness of the magnetic material-containing resin. Further, although not particularly specified in the block diagram in FIG. 2, by adjusting the temperature of the heater 8 by feeding back while measuring the temperature in the barrel 7 by the thermocouple 22 as shown in FIG.
The temperature of the heater 8 can be adjusted by the closed loop control by the PI operation that brings the temperature of the magnetic material-containing resin 11 in the barrel 7 close to the target value. Then, if there is a slight error in the thickness of the magnetic material-containing resin 11, it is cut by a precision lathe and the surface is further polished by a precision polishing device.

As described above, according to the method of manufacturing a magnet roll of the present invention, specifically, the outer diameter of the chattoft body 17a is
14 mm, length 305 mm, thickness of the magnetic substance-containing resin 11 is set to 1 mm, and when the shaft 17 is coated with the magnetic substance-containing resin 11 and magnetically bonded to produce a magnet roll, the standard outer diameter of the magnet roll is set. On the other hand, it is possible to set the error range within approximately 0.2 mm. That is, despite the high quality requirement level of the finished outer diameter accuracy of the product, it can be molded to almost the target thickness of the magnetic material-containing resin 11, is almost cut by a precision lathe, and is further surface-polished by a precision polishing device. Since it is not necessary to perform finish polishing, the product cost can be significantly reduced.

[0020]

According to the method of manufacturing a magnet roll of the present invention, while visually confirming the condition of the coated magnetic material-containing resin, the feed rate of the shaft and the resin extrusion amount are used as control factors, for example, are manually fed back. Just control
Since the thickness of the magnetic substance-containing resin coated on the shaft can be freely changed and a magnet having almost the desired magnetic substance-containing resin thickness can be molded, it can be cut with almost a precision lathe and further precision polished. There is no need to finish polishing the surface with the device, and the overall product cost can be significantly reduced.

Further, a motor is used as a drive source for feeding the shaft, and closed-loop control is used to bring the feeding speed of the shaft close to a target value by adjusting the feeding speed of the shaft while detecting the motor rotation speed. By adjusting the screw rotation speed while detecting the screw rotation speed in the extrusion molding machine, more accurate control can be performed when the closed loop control that makes the resin extrusion amount close to the target value is used.

In addition, when the pellet supply amount to the extrusion molding machine is also controlled by adding it to the control factor, the resin indentation amount can be finely adjusted, and finer and more accurate control can be performed.

[Brief description of drawings]

FIG. 1 is a conceptual plan view showing a method of manufacturing a magnet roll.

FIG. 2 is a block diagram showing a method of manufacturing a magnet roll.

FIG. 3 is a vertical sectional view showing a connected state of a shaft and a socket.

[Explanation of symbols]

 A Magnet roll manufacturing apparatus 1 Extrusion molding machine 2 Moving means 3 Fixed amount feeder 4 units Scale 5 Vibrator 6 Drive motor 7 Barrel 8 Heater 9 Drive motor 10 Screw 11 Magnetic substance containing resin 12 Die 13 Inlet side clamp 14 Outlet side clamp 15 AC Motor 16 Chain 17 Shaft 18 Socket 19 Through hole 20 Connecting shaft body 21 Single unit 22 Thermocouple

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29L 31:32 4F

Claims (4)

[Claims] 1. To coat a magnetic substance-containing resin on the surface of a shaft by feeding and passing the shaft through a die of an extruder, while visually observing the state of the coated magnetic substance-containing resin, A method for producing a magnet roll, characterized in that the thickness of the magnetic substance-containing resin to be coated can be set to a desired thickness by performing feedback control with the feed rate of the shaft and the resin extrusion amount as control factors. 2. A shaft is fed by using a motor as a drive source, and closed-loop control is used to bring the shaft feed speed closer to a target value by adjusting the shaft feed speed while detecting the motor rotation speed. Item 1. A method for manufacturing a magnet roll according to Item 1. 3. The magnet roll according to claim 1, wherein closed loop control is used to bring the resin extrusion amount close to a target value by adjusting the screw rotation speed while detecting the screw rotation speed in the extruder. Manufacturing method. 4. The method for producing a magnet roll according to claim 1, wherein the pellet supply amount to the extruder is added as a control factor.