JP2007306704A - Manufacture of field system portion of cylindrical linear motor and field system portion manufactured by this method, and cylindrical linear motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of the field system portion of a cylindrical linear motor and the cylindrical linear motor field system portion, and a cylindrical linear motor, in which when a portion, between the members of a shaft provided with permanent magnets making up of the field system and a can, is coupled by a reinforcing ring, the joint portion of the reinforcing ring and the can can be fixed by a cost-effective and simple method, without using a welding method and effect by thermal deformation during the process can be suppressed. <P>SOLUTION: The field system portion of the cylindrical linear motor is provided, with a plurality of permanent magnets 6 inserted and provided at the inner diameter side of the can 7 of a thin cylindrical shape, a shaft 8 inserted into the end of the row of the permanent magnets 6, and the reinforcing ring 10 press fitted between the can 7 and the shaft 8. In this field system portion, stepped corrugate groove portions 8a are provided at the end of the shaft 8. The reinforcing ring 10, press fitted onto the outside circumference of the stepped groove portions 8a of the shaft 8, is fitted into the inner diameter portion of the can 7 and fixed by caulking, which presses the wall of the can 7 into the inner diameter side of the reinforcing ring 10 to stop the rotation of the reinforcing ring 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a cylindrical linear motor field part, a cylindrical linear motor field part manufactured by this method, and a cylindrical linear motor including the field part and an armature part.

Conventionally, a cylindrical linear motor provided with a cylindrical field and armature is as shown in FIG.
FIG. 5 is a side sectional view showing a configuration of a conventional cylindrical linear motor.
In FIG. 5, 1 is a stator, 2 is a mover, 3 is a bearing, 4 is a yoke, 5 is a coil, 6 is a permanent magnet, 7 is a can, 8 is a shaft, 9 is a bracket, and 14 is an iron piece.
The stator 1 and the mover 2 of the linear motor are opposed to each other via a magnetic gap, and the mover 2 is axially supported by a bearing 3 via brackets 9 provided at both ends of the stator 1. . Among them, the stator 1 is configured by arranging a plurality of cylindrical coils 5 serving as electric loading means in the axial direction on the inner diameter side of a yoke 4 made of a cylindrical magnetic body. Further, the mover 2 has a cylindrical permanent magnet 6 in the axial direction as a magnetic loading means magnetized in the direction indicated by an arrow in the figure on the inner diameter side of a cylindrical thin stainless steel can 7 extending in the axial direction. A plurality of magnets are inserted and the magnets are arranged in the same polarity with each other, and a cylindrical iron piece 11 is sandwiched between the magnets. A space for inserting the shaft 8 is provided at both ends of the magnet row of the permanent magnet 6 inside the can 7.
FIG. 6 shows an enlarged view of the joint between the shaft and the can in the linear motor field part of FIG. The field magnet portion constituting the linear motor movable element 2 is inserted with a shaft 8 processed with high precision in a space at both ends on the inner diameter side of the can 7 in which a magnet row is inserted, and an end portion of the shaft 8 is inserted. After press-fitting a reinforcing ring 11 processed with high precision between the outer peripheral surface and the inner peripheral surface of the can 7, the joint portion between the can 7 and the reinforcing ring 11 is integrated by laser welding (for example, a patent) Reference 1).
Japanese Patent Laying-Open No. 2004-360859 (Specification, page 4, FIG. 2)

However, since the conventional cylindrical linear motor has a step of press-fitting the reinforcing ring between the can and the shaft, these members require high-precision processing, and the processing cost is expensive.
Also, when using a cylindrical linear motor with a mover of a few millimeters in diameter, press the reinforcing ring between the can and the shaft, and then weld the can and the reinforcing ring with a laser with high energy density. When welded, the welded part becomes very hot, but the joints between the parts to be welded are structurally small, so heat is applied to the periphery of each part other than the joints, and processing during welding There was a problem that thermal deformation occurred due to heat, and the can and the reinforcing ring could not be combined with high accuracy.
Therefore, the present invention has been made in view of such problems, and when the reinforcing ring is used to connect the shaft and the can member having the permanent magnet constituting the field with the reinforcing ring, the present invention has been made. The method of manufacturing a cylindrical linear motor field part that can be fixed in an inexpensive and simple manner without using welding, and that can suppress the influence of thermal deformation during processing, and this It is an object of the present invention to provide a cylindrical linear motor field part manufactured by the method and a cylindrical linear motor.

In order to solve the above problems, the present invention is configured as follows.
The invention according to claim 1 includes a step of inserting a plurality of permanent magnets serving as magnetic loading means on the inner diameter side of a thin cylindrical can extending in the axial direction, and a magnet array of the permanent magnets inserted into the can. A step of inserting a shaft into an end portion, and a step of press-fitting a reinforcing ring between the can and the shaft, and the field magnet portion so as to closely contact the adjacent permanent magnets from both ends of the can In the method for manufacturing a magnetic field portion of a cylindrical linear motor configured to form a stepped groove portion wavy in a stepped shape at the end of the shaft, a position facing the stepped groove portion of the shaft A caulking punch is installed, and by the caulking punch, the reinforcing ring press-fitted into the outer periphery of the stepped groove portion of the shaft is fitted and fixed to the inner diameter portion of the can and fixed by caulking. There has been characterized by flows into the inner diameter side of the reinforcing ring has to perform the detent of the reinforcing ring.

  The invention according to claim 2. A plurality of permanent magnets serving as magnetic loading means inserted on the inner diameter side of a thin cylindrical can extending in the axial direction, and a shaft inserted at an end of a magnet row of the permanent magnet inserted in the can And a reinforcing ring press-fitted between the can and the shaft, and a cylindrical linear member comprising a field portion so as to closely contact the adjacent permanent magnets from both ends of the can In the field portion of the motor, a stepped groove portion undulated in a stepped shape is provided at the end portion of the shaft, and a reinforcing ring press-fitted into the outer periphery of the stepped groove portion of the shaft is fitted into the inner diameter portion of the can. The can is fixed by caulking, and the meat of the can flows into the inner diameter side of the reinforcing ring by caulking to prevent rotation of the reinforcing ring.

  According to a third aspect of the present invention, the cylindrical linear motor field portion according to the second aspect is disposed opposite to the outside of the linear motor field portion via a magnetic gap, and the cylindrical magnetic body is used. A cylindrical linear motor armature configured by arranging a plurality of coils wound in a cylindrical shape serving as electric loading means in the axial direction on the inner diameter side of the metal pipe, and the field portion and the armature portion One of these is a movable element and the other is a stator, and a cylindrical linear motor is configured to travel relatively between the field part and the armature part.

According to the first or second aspect of the present invention, when the reinforcing ring is connected between the shaft and the can member having the permanent magnet constituting the field by the reinforcing ring, the reinforcing ring and the can are pressurized using the caulking punch. Since they are deformed, the members can be fixed very easily and quickly, leading to improvement in productivity and cost reduction in the production of the linear motor field part.
In addition, the present invention uses the above-described means, so that the shaft and the reinforcing ring are processed with high accuracy as in the prior art, and the joint between the reinforcing ring and the can is fixed by welding, or processing at the time of welding. The influence of heat deformation due to heat can be eliminated.
According to the third aspect of the present invention, by using the field part according to the first or second aspect in combination with an armature, productivity in terms of manufacturing as a whole linear motor is increased, and reliability is improved. A high cylindrical linear motor can be obtained.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

FIG. 1 is an enlarged side cross-sectional view of a shaft-can coupling portion in a linear motor field portion showing a first embodiment of the present invention. Note that the description of the same constituent elements of the present invention as those of the prior art will be omitted, and only different points will be described.
In FIG. 1, 8a is a stepped groove and 10 is a reinforcing ring.

The features of the present invention are as follows.
That is, a plurality of permanent magnets 6 serving as magnetic loading means inserted on the inner diameter side of the thin cylindrical can 7 extending in the axial direction, and an end of the magnet row of the permanent magnet 6 inserted in the can 7 The inserted shaft 8 and the reinforcing ring 10 press-fitted between the can 7 and the shaft 8 are provided, and the field portion is configured so that the adjacent permanent magnets 6 are in close contact from both ends of the can 7. In the field portion of the cylindrical linear motor formed as described above, a stepped groove portion 8a undulating in a stepped shape is provided at the end of the shaft 8, and a reinforcing ring press-fitted into the outer periphery of the stepped groove portion 8a of the shaft 8 10 is fitted to the inner diameter portion of the can 7 and fixed by caulking, and the meat of the can 7 flows into the inner diameter side of the reinforcing ring 10 by caulking to prevent the reinforcing ring 10 from rotating.

Next, the manufacturing method of the field part of a cylindrical linear motor is demonstrated using FIG.2 and FIG.3.
FIG. 2 is a side sectional view showing a state before the shaft, the can and the reinforcing ring are fitted together, and FIG. 3 shows a procedure for caulking and fixing the linear motor field part. It is a front sectional view along the AA line, and shows a state before caulking is fixed by setting the caulking punch in the vertical direction of the field part, (b) is a side sectional view of (a), (c) is It is a sectional side view which shows the state at the time of crimping. In FIG. 3, 12a indicates an upper caulking punch, and 12b indicates a lower caulking punch.
First, in FIG. 2, a plurality of permanent magnets (not shown) are inserted on the inner diameter side of a thin cylindrical can 7 extending in the axial direction. Subsequently, the shaft 8 is inserted into the end of the magnet row of the permanent magnet 6 inserted into the can 7, and the reinforcing ring 10 is press-fitted between the can 7 and the shaft 8.
Next, as shown in FIGS. 3 (a) and 3 (b), an upper caulking punch 12a and a lower caulking punch 12b are installed at a position facing the stepped groove portion 8a undulated in a stepped manner at the end of the shaft 8. To do. Subsequently, as shown in FIG. 3C, the reinforcing ring 10 and the can 7 that are press-fitted into the outer peripheral portion of the stepped groove portion 8a of the shaft 8 are added by the upper caulking punch 12a and the lower caulking punch 12b. When caulking by pressure deformation, the meat of the can 7 plastically deformed during caulking flows into the inner diameter side of the reinforcing ring 10 and the reinforcing ring 10 is prevented from rotating.

Therefore, the present invention employs means for pressurizing and deforming the reinforcing ring and the can using a caulking punch when the shaft and the can provided with the permanent magnet constituting the field are coupled by the reinforcing ring. The members can be fixed very easily and quickly. As a result, there is an effect that the production efficiency of the linear motor field part is improved and the cost is reduced.
In addition, the present invention uses the above-described means, so that the shaft and the reinforcing ring are processed with high accuracy as in the prior art, and the joint between the reinforcing ring and the can is fixed by welding, or the processing at the time of welding is performed. The influence of heat deformation due to heat can be eliminated.
Further, by using the field part in combination with the armature, productivity in terms of manufacturing as the whole linear motor is improved, and a highly reliable cylindrical linear motor can be obtained.

Instead of the first embodiment shown in FIG. 3, a caulking punch as shown in FIG. 4 may be used. FIG. 4 is an enlarged side cross-sectional view of a shaft-can coupling portion in a linear motor field portion showing another embodiment of the present invention.
That is, the protrusion shape at the tip of the upper caulking punch 13a and the lower caulking punch 13b is changed from a triangular shape to a rectangular shape, and can be appropriately changed to an optimal shape.

  According to the present invention, since the field part provided with the permanent magnet constituting the mover can be manufactured at a low cost by a simple method, a cylindrical linear motor is configured by combining the field part with the armature. In addition to liquid crystal / semiconductor manufacturing equipment or inspection equipment that requires high-precision positioning and microfeeding, for example, it can be applied to a chip mounter head or the like by arranging a plurality of small cylindrical linear motors. .

It is the sectional side view to which the coupling | bond part of the shaft and can in the linear motor field part which shows 1st Example of this invention was expanded. It is a sectional side view which shows the state before fitting a shaft, a can, and a reinforcement ring. The procedure for caulking and fixing the linear motor field part is shown, (a) is a front sectional view taken along the line AA in (b), the caulking punch is set in the vertical direction of the field part, FIG. 2B is a side sectional view of FIG. 1A, and FIG. 2C is a side sectional view showing the state before caulking. It is the sectional side view to which the coupling | bond part of the shaft and can in the linear motor field part which shows the other Example of this invention was expanded. It is a sectional side view which shows the structure of the conventional cylindrical linear motor. FIG. 6 is an enlarged view of a shaft-can coupling portion in the linear motor field portion of FIG. 5.

Explanation of symbols

1 Stator,
2 mover,
3 bearings,
4 York,
5 coils,
6 Permanent magnet,
7 Can,
8 shaft,
8a Stepped groove,
9 Bracket,
10, 11 reinforcement ring,
12a, 13a Top caulking punch,
12b, 13b Lower caulking punch,
14 Iron piece

Claims (3)

Inserting a plurality of permanent magnets as magnetic loading means on the inner diameter side of the thin cylindrical can extending in the axial direction;
Inserting a shaft into the end of the magnet row of the permanent magnet inserted into the can;
Press-fitting a reinforcing ring between the can and the shaft;
In the manufacturing method of the field part of the cylindrical linear motor, wherein the field part is configured to closely contact between the permanent magnets adjacent from both ends of the can,
The end of the shaft has a stepped groove that is undulated in a stepped shape,
A caulking punch is installed at a position facing the stepped groove portion of the shaft,
With the caulking punch, the reinforcing ring press-fitted into the outer periphery of the stepped groove portion of the shaft is fitted into the inner diameter portion of the can and fixed so as to be caulked,
A method of manufacturing a cylindrical linear motor field portion, wherein the meat of the can flows into the inner diameter side of the reinforcing ring by caulking to prevent rotation of the reinforcing ring. A plurality of permanent magnets serving as magnetic loading means inserted on the inner diameter side of the thin cylindrical can extending in the axial direction;
A shaft inserted into an end of a magnet row of the permanent magnet inserted into the can;
A reinforcing ring press-fitted between the can and the shaft;
In the field part of the cylindrical linear motor formed from both ends of the can, the field part is configured to closely contact between the adjacent permanent magnets.
A stepped groove portion undulating in a stepped shape is provided at the end of the shaft,
A reinforcing ring press-fitted into the outer periphery of the stepped groove portion of the shaft is fitted and fixed to the inner diameter portion of the can, and the meat of the can flows into the inner diameter side of the reinforcing ring by caulking and the reinforcing ring Cylindrical linear motor field part characterized by being prevented from rotation. The cylindrical linear motor field part according to claim 2,
A coil wound in a cylindrical shape serving as an electric loading means is axially disposed on the inner diameter side of a metal pipe made of a cylindrical magnetic body and opposed to the outside of the linear motor field portion via a magnetic gap. A plurality of cylindrical linear motor armatures arranged side by side,
The field portion and the armature portion are relatively driven by using one of the field portion and the armature portion as a mover and the other as a stator. Cylindrical linear motor.

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