JPS62136332A - Round type electromagnetic chuck and its manufacturing method - Google Patents

Abstract

PURPOSE:To enable the electromagnetic chuck in the caption to adsorb a work strongly by providing a magnetic body of disc shape on which grooves of concentric circle shape are formed in the adsorptive surface side and separators charged into respective grooves from the upper sides of exciting coils. CONSTITUTION:Adsorption is performed by a current flow in an exciting coil 2. The upper surface portion of 2 magnetic body 1 located between separators 3 works as a magnetic pole portion 1b and an intermediate portion located between the exciting coils works as a core portion 1c, and the bottom portion of the magnetic body 1 works as the bottom plate portion 1d. Accordingly, the magnetism jumps out upward from the magnetic pole portion 1b partitioned by separators 3 and enters an adjacent magnetic pole portion 1b, proceeds to the core portion 1c and reaches the bottom plate portion 1d thus, forming a loop. Consequently, adsorption of a work is carried out. In this case, the single magnetic pole body 1 is composed of the magnetic pole portion 1b, the core portion 1c and the bottom plate portion 1d, and the loss is less because no mating face exists in a magnetic circuit.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a chuck that magnetically attracts a workpiece and fixes it for processing, and particularly relates to a round electromagnetic chuck using an excitation coil and a method for manufacturing the same.

[Prior Art] FIG. 7 shows a sectional view of an example of a conventional round electromagnetic chuck. An excitation coil 72 is concentrically embedded in the bottom surface 71a of the magnetic pole body 71, which has a disk-shaped outer shape, and a ring-shaped separator 73 made of synthetic resin is concentrically embedded in the top surface 71b, which serves as the workpiece attraction surface. It is buried. And v! A bottom plate 74 is brought into contact with the bottom surface 71a of the i-pole body 7, and by tightening the bolts 75, the magnetic pole body 71 and the bottom plate 7 are brought into contact with each other.
4 are integrated. The upper surface 71b portion of the magnetic pole body 71 divided by the separator 73 is formed alternately with magnetic portions 77 on which induced magnetism by the iron core portion 76 acts. The work piece is picked up by looping above the pipe.

[Problems to be Solved by the Invention] However, in the conventional round electromagnetic chuck, in order to fit the excitation coil 72 and the separator 73, the magnetic pole body 71
It is necessary to form concentric grooves on both sides of the lower surfaces 71a and 71b. For this reason, groove machining becomes troublesome. In particular, the groove on the upper surface 71b into which the separator 73 is fitted requires highly accurate cutting because the width of the separator is generally as thin as 2 to 5 m, which requires a great deal of labor and skill. Further, since the distance between the grooves on the lower surface 71a and the grooves on the upper surface 71b is usually about 1 to 3rIVR, the strength is deteriorated and the structure is inferior in durability.

The present invention has been made in consideration of the above circumstances, and it is an object of the present invention to provide a round electromagnetic chip that is easy to manufacture and has increased strength. Further, the present invention aims to provide a method of manufacturing such a round electromagnetic chuck with ease.

[Means for Solving the Problems] The round electromagnetic chuck according to the present invention uses a magnetic pole body having concentric grooves on the attracting surface side, and inserts an excitation coil and a separator into the grooves of the magnetic pole body. It is characterized by what it did. In addition, the manufacturing method according to the present invention includes forming concentric grooves only on the attracting surface side of the magnetic pole body, embedding the excitation coil in this groove, and then filling the upper part of the excitation coil with a separator. It is a feature.

[For production]

In the present invention, the space between the grooves of the magnetic pole body becomes a magnetic pole part, and when a current is passed through the excitation coil, the magnetic pole part is excited and magnetic lines of force are emitted from the magnetic pole part, and these lines of magnetic force jump out above the attracting surface and are adjacent to each other! Loop between one magnetic pole. Thereby, the workpiece can be attracted.

〔Example〕

Hereinafter, one embodiment of a round electromagnetic chuck according to the present invention will be specifically described based on a cross-sectional view shown in FIG. 1 and a perspective view shown in FIG. 2. The round electromagnetic chuck of this embodiment includes a magnetic pole body 1, an exciting coil 2, a separator 3, and a float 1i11.
It has four poles and a rib. The magnetic pole body 1 has a disc-shaped outer shape, and grooves of a constant depth are concentrically bored from the upper surface 1a side which serves as the attraction surface. An excitation coil 2, a separator 3, and a floating pole 4 are inserted into this space.

The excitation coils are wound around a ring so as to have the same diameter as the five concentric rings, and each excitation coil 2 is fitted into its respective groove 5.

In this case, the radius dimension of the excitation coil 2 is smaller than the depth dimension of the groove 5, and when inserted into the groove 5, the excitation coil 2 is buried in the groove 5.

The separator 3 is made of a non-magnetic material such as synthetic resin, and is wound in a ring shape as a whole, and has a corner rLIJ-shaped cross section with an open upper part. be fitted into.

The floating magnetic pole 4 is a ring having a rectangular cross section, and is fitted into the separator 3 from the upper open end of the separator 3. After such assembly, the upper surfaces of the separator 3 and the floating pole 4 become flush with the upper surface 1a of the magnetic pole body 1, and the workpiece can be stably placed on the upper surface 1a of the magnetic pole body 1. There is.

Attraction according to this embodiment is performed by passing a current through the excitation coil 2. The upper surface portion of the magnetic pole body 1 interposed between the separators 3 acts as the magnetic pole portion 1b, and the intermediate portion interposed between the excitation coils 2 acts as the iron core portion 1c,
The lower surface portion of the magnetic pole body 1 acts as a groove with the bottom plate portion 1d. Therefore, the magnetism jumps upward from the magnetic pole part 1b divided by the separator 3, enters the adjacent magnetic pole part 1b, and loops to reach the iron core part 1c and the bottom plate part 1d. This causes the workpiece to be attracted.

In this case, a single magnetic pole body 1 includes a magnetic pole portion 1b and an iron core portion 1.
Since the C1 bottom plate portion 1d is formed and there is no mating surface in the magnetic circuit, loss is small, attraction force is large, and reliable operation can be performed. Further, in this embodiment, since the floating magnetic pole 3 inserted into the separator 3 is also excited, it is possible to attract the floating magnetic pole 3 portion, and even a small workpiece can be reliably attracted.

Next, a method of manufacturing the round electromagnetic chuck having the above structure will be explained with reference to FIGS. 3 to 5.

After the magnetic pole body 1 is previously formed into a disk shape, a concentric circle Fj5 is formed as shown in FIG. This groove is bored only from the upper surface 1a of the magnetic pole body 1, which serves as the attracting surface, and no groove is formed on the lower surface of the magnetic pole body.

After forming the groove 5, the excitation coil 2 is inserted into each W45 and buried in the groove 5, as shown in FIG. Next, using adhesive or solder, insert a separator 3 with a square rlJJ-shaped cross section into each groove 5 from above the excitation coil 2 as shown in Fig. 5, and then insert a floating F41 pole 4 into the separator 3. Then, the upper surface 1a of the magnetic pole body 1 is polished and finished.

According to such a manufacturing method, the groove 5 is formed on the upper surface 1 of the magnetic pole body 1.
Since the hole is drilled only in point a, the drilling work is simplified. Further, since it is not necessary to process a groove to match the separator 3, which requires precision, drilling becomes easy. Furthermore, since the grooves 5 are formed only on the upper surface 1a of the magnetic pole body 1, the strength is increased and the durability is improved, and there is no need to tighten the poles 1 to 1, speeding up the manufacturing process.

FIG. 6 is a cross-sectional view of another embodiment of the invention, in which the same elements as in the previous embodiment are designated by the same reference numerals.

In this embodiment, the separator 3G fitted into the groove 5 from above the excitation coil 2 has a solid rectangular cross section. Therefore, the floating magnetic pole 3 is not fitted into the separator 3, and the structure as a whole is simplified.

〔Effect of the invention〕

As described above, according to the present invention, concentric grooves are formed only on the attracting surface side of the magnetic pole body, and the excitation coil and lever lever are inserted into the grooves, so that the strength is improved and the workpiece can be gripped powerfully. A round electromagnetic chuck that can be adsorbed can be obtained.

Further, according to the manufacturing method according to the present invention, a round electromagnetic chuck can be manufactured with advanced processing.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of one embodiment of a round electromagnetic chuck according to the present invention, FIG. 2 is a perspective view thereof, FIGS. 3 to 5 are cross-sectional views showing the manufacturing process thereof, and FIG. A cross-sectional view of the embodiment,
FIG. 7 is a sectional view of a conventional round electromagnetic chuck. DESCRIPTION OF SYMBOLS 1... Magnetic pole body, 1a... Attraction surface, 2... Excitation coil, 3... Separator, 4... Floating magnetic pole, 5... Groove. Applicant's agent Sato-O 1 Prisoner 2 z Ki 3 Figure

Claims (1)

[Scope of Claims] 1. A disc-shaped magnetic pole body with concentric grooves formed on the attracting surface side, an excitation coil inserted so as to be embedded in each of the grooves, and each of the excitation coils inserted from above the excitation coil. A round electromagnetic chuck with a separator filled in the groove. 2. The round electromagnetic chuck according to claim 1, wherein a floating magnetic pole is inserted into the separator. 3. Drilling concentric grooves on the attraction surface side of the disk-shaped magnetic pole body, inserting excitation coils into each of the grooves, and filling each groove with a separator from above the excitation coil. A method for manufacturing a round electromagnetic chuck, comprising: