JP2689541B2 - Roller return passage coating structure in linear guide device and its manufacturing method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roller return passage coating structure in which the inner wall of the roller return passage in a linear guide device is covered with plastic, and a method for manufacturing the same.

[Conventional technology]

The roller linear guide device is a linear guide device using a roller having a substantially square vertical section as a rolling element. As a conventional roller linear guide device of this type, for example,
There is one presented in the publication of 60-118021.

As shown in FIG. 5, a slider 2 is movably supported in the axial direction on a draft rail 1 which has roller rolling grooves 3 extending in the axial direction on both sides and extends. . A roller rolling groove 4 is formed on the inner surface of the slider 2 so as to face the roller rolling groove 3 of the guide rail. Further, a roller return passage 5 parallel to the roller rolling groove 4 is formed. The roller rolling grooves 3 and 4 and the roller return passage 5 are connected to each other by a curved path at the end to form a roller circulation path. A large number of rollers R are rotatably inserted in the roller circulation path. Through the rolling of these rollers R, the slider 2 is lightly movable in the front-rear direction on the guide rail 1.

[Problems to be solved by the invention]

By the way, the roller return passage 5 has a square cross section in accordance with the shape of the roller R. However, since it is not possible to easily form a deep rectangular through-hole, in the conventional reeler linear guide device described above, the roller return passage 5 is divided into two parts at the central part, and the V-grooves are respectively formed in the divided members. A method of processing and thereafter combining these divided members to form a square roller return passage 5 has been adopted.

Therefore, there has been a problem that the number of parts increases and the structure of the product becomes complicated.

However, broaching is conceivable in order to form the roller return passage 5 without using such a dividing method.

However, the broaching process in this case has the following problems.

Prior to punching the broach, it is necessary to drill a pilot hole for the broach, and this pilot hole must be drilled with a diameter smaller than the distance between the facing surfaces of the square holes. That is, the prepared hole drill diameter is small. Therefore, the drill is easily bent, the machining efficiency is low, and the machining accuracy is poor.

 Broach tools are very expensive and costly to process.

Burrs during broaching accumulate in the corners of the square holes, and it is difficult to completely remove them.

Therefore, the present invention has been made by paying attention to the above-mentioned conventional problems, and the purpose thereof is not to use a dividing method or broaching but to utilize a simple and highly accurate drilling hole, It is an object of the present invention to form a square hole of a roller return passage in a linear guide device at low cost, efficiently and with high accuracy.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention provides a guide rail extending with roller rolling grooves in the axial direction on both sides, and a guide rail that is movably fitted on the guide rail and rolls on the guide rail. A slider having a roller rolling groove facing the moving groove on its side surface and having a roller return passage parallel to the side wall in its thickness, and a roller circulation path including both the roller rolling grooves and the roller return passage. In the linear guide device having a large number of moving rollers, the roller return passage is formed by a polygonal cross-section through hole formed directly on the inner surface of the drilled circular cross-section through hole made of plastic.

The plastic may contain a solid lubricant.

Further, in the method for manufacturing the roller return passage in the linear guide device of the present invention, a through hole having a circular cross section having a diameter larger than the diagonal length of the roller is formed at the roller return passage forming position, and a predetermined amount of plastic is poured into the through hole. A prism is inserted into the through hole, the space between the prism surface and the inner wall of the through hole is filled with plastic, and after the plastic is solidified, the prism is removed to form a roller return passage.

[Action]

The structure of the roller return passage is made by directly injecting plastic into the through hole of circular cross section to form the through hole of rectangular cross section, so that the through hole of circular cross section can be made with a large drill. It can be drilled, and the drilling process is easy and efficient. Further, since it is only necessary to inject plastic into the through hole to directly form a through passage having a rectangular cross section, the conventional expensive and troublesome broaching process can be eliminated, and deburring work is not required at all. Further, since the inner wall of the through hole drilled by the drill is rough, the injected plastic adheres well and there is no risk of peeling or moving.

Further, it is not necessary to divide the slider to form the roller return passage, and the structure is simple and the cost is low.

If the plastic coating layer contains a solid lubricant, the driving friction of the slider can be reduced.

〔Example〕

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

1 to 4 show one embodiment of the present invention. The same or corresponding parts as in the conventional case are designated by the same reference numerals.

The main body 2A of the slider 2 which is movably fitted on the guide rail 1 is not a conventional divided structure but an integrated structure.
A roller return passage 5 is provided in the wall thickness of the sleeve portion 2b having a U-shaped cross section. The roller return passage 5 has a circular through-hole.
The inner peripheral surface of 10 is covered with a plastic coating layer 11, and a square through hole 12 is formed at the center. Its square through hole 12
The size of is such that the roller R can easily pass therethrough. The plastic coating layer 11 may be a thermosetting synthetic resin or a thermoplastic synthetic resin as long as it is solidified at the operating temperature of the linear guide device. Further, the rectangular through holes 12 may be arranged substantially symmetrically with the rollers R in the roller rolling grooves 3 and 4 as shown in the drawing, but the arrangement is not limited to this and, for example, the roller shaft may be arranged vertically. It is possible. Furthermore, the position of the roller return passage 5 is not limited to the one shown in the figure, and the roller return passage 5 may be arranged at another place within the wall thickness of the sleeve portion 2b.

 The manufacturing method of the roller return passage 5 will be described below.

First, a through hole (prepared hole) 10 having a circular cross section is formed at a predetermined position within the thickness of the sleeve portion 2b of the slider body 2A (second hole).
Figure). In this drilling process, a drill having a diameter larger than the length of the diagonal line of the roller R is used.

That is, since the diameter of the drill is much larger than the diameter of the prepared hole drilled when the roller return passage 5 is broached, there is no problem such as bending of the drill, and drilling can be performed with high efficiency.

Next, the lower end side of the pilot hole 10 is closed first, and the plastic 11A such as a room temperature curing type epoxy resin is filled from the upper opening with the pilot hole 10
Pour a predetermined amount into it (Fig. 3).

After that, in this pilot hole 10, a prismatic punch with a release agent applied
Insert 15 all the way to the bottom. The prismatic punch 15 has the same sectional shape and size as the rectangular sectional shape and size of the roller return passage 5. Further, a flange 16 is provided in accordance with the length L of the slider body 2A (that is, the length of the roller return passage 5), and a discharge port 17 for the excess plastic 11A is formed in this. As a result, the space between the pilot hole 10 and the prismatic punch 15 is filled with the plastic 11A, and the prismatic punch 15 can be positioned and held well (FIG. 4).

Once the filled plastic 11A has hardened, prismatic punch 1
Pull out 5.

Thus, the plastic coating layer 11 on the inner surface of the pilot hole 10,
The rectangular through hole 12 is easily formed.

According to this embodiment, it is not necessary to divide the slider 2 to form the roller return passage 5, and the structure is simplified.

Further, it is not easy to machine a thin deep hole, an expensive tool is required, and a broaching process that requires difficult deburring work is also unnecessary, which greatly contributes to cost reduction and improvement of settlement efficiency. You can

In addition, the effect of being able to mitigate the problem of noise, which has recently become particularly strict, was obtained. That is, the slider body 2A is a copper product. Therefore, the contact between the inner wall of the conventional roller return passage 5 and the roller R is copper-to-copper contact,
Although noise is high when the slider 2 moves at high speed, in this embodiment the roller R contacts the plastic coating layer 11,
The noise generation will be significantly reduced.

If a solid lubricant such as graphite or molybdenum disulfide is mixed in advance with the plastic coating layer 11, the sliding friction of the roller R can be reduced, and the drive torque of the linear guide device drive motor is reduced. It is possible.

〔The invention's effect〕

As described above, according to the first aspect of the present invention,
In the roller linear guide device, the roller return passage is
The inner wall of the drilled through hole having a circular cross section was formed by covering the inner wall with plastic in a square shape. Therefore, it is possible to obtain the effect that the roller return passage can be formed inexpensively, efficiently, and with high accuracy, without depending on the divided structure or the broaching process. Further, according to the invention of claim 3, since the plastic is poured into the drilled through hole and then the prism is inserted, the through hole which is the lower hole and the prism which is the mold member are formed without the dedicated plastic injection hole. The effect is that it is easy to completely fill the space between with the plastic.

Further, if the plastic coating layer contains a solid lubricant, the effect of reducing the driving friction of the slider can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of an essential part of an embodiment of the present invention. Second
FIGS. 3, 3 and 4 are partial cross-sectional views for explaining the manufacturing process of the one shown in FIG. 1, and FIG. 5 is a front view showing the structure of the roller return passage in the conventional roller linear guide device in partial cross-section. It is a figure. 1 is a guide rail, 2 is a slider, 3 and 4 are ball rolling grooves, 1
0 is a through-hole (lower hole) with a circular cross section, 11 is a plastic coating layer, 12 is a rectangular through-hole, and 15 is a prismatic punch.

Claims (3)

(57) [Claims] 1. A guide rail which has roller rolling grooves extending in the axial direction on both side surfaces and is extended, and is movably fitted on the guide rail and faces the roller rolling groove of the guide rail. A slider having a roller rolling groove on its side surface and having a roller return passage parallel to it in its thickness, and a large number of rollers rolling in a roller circulation path including both the roller rolling grooves and the roller return passage. In the linear guide device provided with, the roller return passage of the roller return passage in the linear guide device, characterized in that it is a rectangular cross-section through hole formed directly on the inner surface of the through hole of the drilled circular cross section with plastic. Coating structure. 2. The coating structure for a roller return passage in a linear guide device according to claim 1, wherein the plastic contains a solid lubricant. 3. A through hole having a circular cross section with a diameter larger than the diagonal length of the roller is drilled at a position where the roller return passage is formed, a predetermined amount of plastic is poured into the through hole, and a prism is formed in the through hole. The linear structure according to claim 1, characterized in that the space between the inner wall of the through hole and the surface of the prism is inserted and filled with plastic, and after the plastic is solidified, the prism is removed to form a roller return passage. Manufacturing method of roller return passage in guide device.