JPH01320304A - Rodless cylinder - Google Patents

Abstract

PURPOSE:To aim at the enhancement of work efficiency at the time of assembling, the reduction of cost and lengthening life by using a permanent magnet whose basic components are R (at least one kind of rare earth elements including Y)-M(at least one kind of transition metal elements)-X(at least one kind of IIIb group elements) and which is made by dissolving and casting the basic components and then processing a casting ingot in hot. CONSTITUTION:In a rodless cylinder, R-M-X is the basic components of the piston portion 2 of the rodless cylinder which performs the movement of an object using the magnetizing force of a permanent magnet, and the permanent magnet 3 used for an outside moving portion 1. The permanent magnet which is made by dissolving and casting the basic components and then processing a casting ingot in hot is used. Further, the permanent magnet is made to be aeolotropic in the radial direction or the axial direction. In this way, work efficiency at the time of assembling is enhanced, cost is reduced by the enhancement of yield and its life is lengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rodless cylinder using permanent magnets.

[Prior art] Rodless cylinders are widely used in industry because they require approximately half the installation space of regular air cylinders, improving space efficiency and allowing long strokes. .

The rodless cylinder has a structure in which compressed air is sent into the cylinder space to move the permanent magnet in the piston part, thereby transmitting force by the magnetization force with the permanent magnet in the external moving part, and making the same movement. Permanent magnets are
Sm-Go system and R-F with high coercive force and energy product
An e-B rare earth permanent magnet was used.

[Problems to be Solved by the Invention] However, in the prior art as described above, permanent magnets manufactured by a sintering method were used because permanent magnets with as high performance as possible were required. However, sintered permanent magnets are prone to cracking, chipping, magnetic powder, etc., resulting in lower yields and workability during assembly, resulting in increased costs.

In addition, even after assembly, wear due to friction between the cylinder tube and external moving parts or piston parts due to magnetic particles, and permanent magnet chips due to crashes with the permanent magnets occur, resulting in problems such as reduced reliability and reduced service life. was.

Therefore, the present invention is intended to solve the above-mentioned drawbacks, and its purpose is to improve yield and workability during assembly by using permanent magnets that do not generate cracks, chips, or magnetic particles. Our goal is to provide inexpensive and highly reliable products.

[Means for Solving the Problems] The rodless cylinder of the present invention has R( However, R is at least one rare earth element including Y), M
(However, at least one transition metal element), and
(However, at least one type of group IIIb element) is used as a basic component, and the permanent magnet is melted and cast, and then the cast ingot is hot worked.

Furthermore, the permanent magnet is characterized by being anisotropic in the radial or axial direction.

[Example] Hereinafter, the present invention will be explained in detail using examples.

[Example-1 Table 1 shows the composition of the permanent magnet alloy of the present invention.

The composition shown in Table 1 was melted, poured into a mold, and cooled to obtain a cast ingot. Hot rolling was carried out at 950° C. to obtain a permanent magnet raw material anisotropic in the thickness direction. Permanent magnet raw material is cut into a predetermined shape, and then 1000
The magnet was magnetically hardened by heat treatment at .degree. C. for 24 hours to obtain a permanent magnet for a rodless cylinder which was anisotropic in the axial direction as shown in FIG.

FIG. 2 shows an example of a rodless cylinder using the axial anisotropic permanent magnet of the present invention. 1 is an external moving part;
2 is a piston part, 3 is a permanent magnet of the external moving part, 4 is a permanent magnet of the piston part, 5 is a cylinder tube, 6 is an external moving part tube, and 7 is a shaft.

The results of determining the incidence of cracking and chipping during assembly and operation for a rodless cylinder using the permanent magnet of the present invention and a rodless cylinder using a conventional Nd-Fe-E sintered permanent magnet. Shown in Table 2. Note that the occurrence rate during operation is the value after driving for 500 hours. The rodless cylinder using permanent magnets of the present invention has almost no cracking or chipping, whereas the conventional rodless cylinder using permanent magnets does have cracking or chipping during assembly and operation. It is easy to do and has low reliability.

Furthermore, since no cracks or chips occur during assembly, assembly work is highly efficient and highly productive.

Table 2 This is a difference in the characteristics of permanent magnets. For example, when a permanent magnet touches a tube or the like during assembly, there is no problem with the permanent magnet of the present invention, whereas with conventional permanent magnets, there is no problem with large chips. Cracks will occur. Furthermore, while conventional permanent magnets tend to generate magnetic particles, the difference between the permanent magnet of the present invention and the permanent magnet of the present invention, which generates less magnetic particles, is manifested in the difference in the incidence of chipping and cracking during operation.

[Example 2] A permanent magnet alloy having the same composition as in Example 1 was melted, poured into a mold, and cooled to obtain a cast ingot. Next 95
Hot extrusion was performed at 0°C to obtain a permanent magnet raw material anisotropic in the radial direction. The permanent magnet raw material is cut into a predetermined shape, cut, and then heated at 1000°C for 24 hours.
A permanent magnet for a rodless cylinder, which was anisotropic in the radial direction as shown in FIG. 3, was obtained by magnetically hardening it by heat treatment for a period of time.

FIG. 4 shows an example of a rodless cylinder using the radially anisotropic permanent magnet of the present invention, in which 1 is an external moving part, 2
3 is a permanent magnet of the external moving part, 4 is a permanent magnet of the piston part, 5 is a cylinder tube, 6 is an external moving part tube, and 7 is a shaft.

The obtained permanent magnet was assembled into a rodless cylinder shown in FIG. 4, and the occurrence rate of cracks and chips during assembly and operation was determined under the same conditions as in Example 1. Table 3 shows the results.

Incidentally, since it is impossible to manufacture a sintered radial anisotropic permanent magnet, the same results as in Example-1 were obtained in this Example, which was not compared.

[Effects of the Invention] As described above, according to the present invention, by using a permanent magnet that uses R-M-X as a basic component, melts and casts it, and then hot-works the cast ingot, ,
It has the effects of improving work efficiency during assembly, reducing costs due to improved yield, improving reliability during operation, and extending life. Moreover, since it can be produced through a simple manufacturing process, it has the effect of being low in price.

[Brief explanation of the drawing]

Figure 1 is a diagram showing an axial anisotropic permanent magnet, Figure 2 is a cross-sectional view 1 of a rodless cylinder using an axial anisotropic permanent magnet, Figure 3 is a diagram showing a radial anisotropic permanent magnet, and Figure 3 is a diagram showing a radial anisotropic permanent magnet. Figure 4 is a sectional view of a rodless cylinder using radially anisotropic permanent magnets. 1... External moving part 2... Piston part 3... Permanent magnet of external moving part 4... Permanent magnet of piston part 5... Cylinder tube 6... External moving part tube 7... Shaft and above applicants Seiko Epson Co., Ltd. financial agent Patent attorney Kizobe Suzuki and 1 other person Figure 3

Claims (2)

[Claims] (1) Permanent magnets used in the piston and external moving parts of rodless cylinders that move objects using the magnetizing force of permanent magnets (R is at least one rare earth element including Y) , M (at least one transition metal element), and X (at least one group IIIb element) as basic components, melted and cast, and then produced by hot working the cast ingot A rodless cylinder characterized by using. (2) The rodless cylinder according to claim 1, wherein the permanent magnet is anisotropic in a radial direction or an axial direction.