JP2002266857A - Liniear guide and manufacturing method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lower a manufacturing cost resulted from improvement in production efficiency, by eliminating a fixing step of a bar-like member to a rail body. SOLUTION: Recess portions 18a, 18b are formed in the rail body 16, and the bar-like members 20a, 20b are inserted into the recess portions 18a, 18b through the predetermined clearances 38a, 38b. Then, with a state where the bar-like members 20a, 20b are inserted into the recess portions 18a, 18b, the rail body 16 and bar-like members 20a, 20b are integrally and simultaneously processed by drawing so that the rail body 16 is calked to fix the bar-like members 20a, 20b into the recess portions 18a, 18b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a linear guide which is applied to, for example, an actuator and linearly guides a slider which reciprocates along an axial direction of an actuator body, and a method of manufacturing the linear guide.

[0002]

2. Description of the Related Art Conventionally, for example, a linear guide has been used for an actuator or the like, and the linear guide has a function of smoothly displacing a slider provided on an upper surface of an actuator body along an axial direction of the actuator body. .

This linear guide comprises a guide rail extending linearly, and a guide block displaced along the guide rail through a plurality of balls rolling in sliding contact with a groove formed in the guide rail. Consists of

By the way, the present applicant positions the rod-shaped member at the engaging portion of the guide rail and attaches the rod-shaped member to the engaging portion by at least one of fixing means such as press-fitting, bonding, welding or brazing. By fixing, the guide rail is prevented from bending and twisting,
A linear guide capable of reducing the manufacturing cost and a method for manufacturing the linear guide have been proposed.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in connection with the above proposal, and has been made by reducing the fixing step of fixing a rod-shaped member in a recess of a guide rail by, for example, brazing. It is an object of the present invention to provide a linear guide capable of improving production efficiency and further reducing the production cost, and a method for producing the linear guide.

[0006]

In order to achieve the above object, the present invention provides a linear guide including a guide rail comprising a rail body and a rod-shaped member fixed in a recess of the rail body and having a sliding surface. The method of manufacturing
A step of separately forming the rail body and the rod-shaped member; a step of inserting the rod-shaped member through a predetermined clearance into a recess formed in the rail body; and a step of inserting the rod-shaped member into the recess. A step of integrally and substantially simultaneously pulling or extruding the rail body and the rod-shaped member while maintaining the state, thereby caulking the rail body to fix the rod-shaped member in the recess, and cutting the rod-shaped member; And / or performing a finishing process by grinding.

[0007] In this case, it is preferable that the recess is formed on both side surfaces of the rail body facing each other or only on one side surface of one side. Further, it is preferable that a set of rod-shaped members is fixed substantially in parallel in the concave portion at a predetermined interval.

Further, the present invention is a linear guide including a guide rail comprising a rail body and a rod-shaped member having a sliding surface fixed in a recess of the rail body, wherein the rail body has a recess formed in a side surface. And a rod-shaped member that is integrally and substantially simultaneously drawn and extruded with the rail body so that the rail body is swaged and fixed in the concave portion.

According to the present invention, the rail body and the rod-shaped member are integrally and substantially simultaneously pulled out or extruded while the rod-shaped member is inserted into the recess, thereby caulking the rail body. Since the rod-shaped member is fixed in the concave portion, for example, fixing work such as brazing is not required, and the manufacturing process is simplified.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a linear guide according to the present invention in relation to a manufacturing method thereof will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1, the linear guide 10 has a long guide rail 12 and a guide block 14 which is displaceable along the guide rail 12.
It is composed of

The guide rail 12 includes a rail body 16 having a substantially rectangular cross section and the rail body 16.
And a pair of recesses 18 having a substantially trapezoidal section.
a, a pair of rod-shaped members 20a, 20 fixed inside 18b
b. The pair of rod members 20a and 20b are
The recesses 18a and 18b are formed to have a substantially trapezoidal cross section corresponding to the cross sectional shape.

In this case, the rail body 16 is preferably formed of a metal material such as aluminum, and the rod-shaped members 20a and 20b are preferably formed of a hardenable metal material.

The rail body 16 is formed with a plurality of fixing holes 22 for fixing the rail body 16 to another member (not shown) at predetermined intervals. The rod-shaped members 20a and 20b are formed with a groove 24 extending along the longitudinal direction and having a substantially arc-shaped cross section.
When the rolling member (not shown) such as a ball slides on the guide block 4, the guide block 14 can be smoothly displaced along the axial direction of the rail body 16.

Next, a drawing apparatus 30 for carrying out a method for manufacturing a linear guide according to an embodiment of the present invention is shown in FIG.
Shown in

The drawing apparatus 30 includes a die 34 having a die hole 32 into which a drawing material is inserted, and a die case 36 for fixing the die 34. And a chuck member (not shown) for pulling in the direction indicated by the arrow under the driving action of.

Guide rail 1 according to an embodiment of the present invention
2 and the drawing apparatus 30 for carrying out the method for manufacturing a guide rail according to the embodiment of the present invention are basically configured as described above.
The operation and effect of the second manufacturing method will be described.

First, a rod-shaped member 20 having a groove 24 along its longitudinal direction by drawing or cutting.
a and 20b are formed, and the rail bodies 16 are formed separately, for example, by a drawing process or a cutting process, in which concave portions 18a and 18b having a substantially trapezoidal cross section are formed on both side surfaces facing each other along the longitudinal direction. I do.

Subsequently, as shown in FIG. 3, a pair of concave portions 18a, 18 formed on both side surfaces of the rail body 16 is formed.
The bar members 20a and 20b are inserted along the line b. In this case, as shown in FIG.
Since the inner dimensions of the rods 8a and 18b are set to be larger than the outer dimensions of the rods 20a and 20b, a predetermined clearance 38a formed between the recesses 18a and 18b of the rail body 16 and the rods 20a and 20b. 38b, the rod-shaped members 20a, 20b are
b.

As described above, the rod-like members 20a, 20b are inserted into the pair of recesses 18a, 18b via the clearances 38a, 38b.
20b is inserted into the mold hole 32 of the die 34 integrally with the rail body 16 in which each is loosely fitted as a drawing material,
By pulling the drawing material by the chuck member under the driving action of a driving source (not shown), the rail body 16 is pulled up.
Is subjected to a drawing process.

In the drawing process, ironing is applied to the side surface of the rail body 16 by the die 34, and the rail body 16 is crimped toward the axis so that the concave portions 18a, 18b and the rod-shaped members 20a, 20b are formed.
The clearances 38a, 38b between the rod bodies 20a, 20b are eliminated and the rod-shaped members 20a, 20b are
18b is firmly fixed (see FIG. 5). FIG.
, The two-dot chain line indicates the rail body 1 before drawing.
6 shows the shape of FIG.

In this embodiment, a predetermined clearance 3 is provided in the recesses 18a and 18b formed in the rail body 16.
After inserting the rod-shaped members 20a and 20b through the holes 8a and 38b, the rod-shaped members 20a and 20b are inserted into the recesses 18a and 18b.
The rail body 16 and the rod-shaped members 20a and 20b are integrally and substantially simultaneously pulled out while maintaining the inserted state of the rail body 16b.
And the rod-shaped member 20 is inserted into the recesses 18a and 18b.
a and 20b are fixed.

Accordingly, in the present embodiment, the rod-shaped members 20a, 20b are provided in the recesses 18a, 18b of the rail body 16.
There is no need to braze or solder the Ob to fix it, so that the manufacturing process can be simplified and the manufacturing cost can be reduced. Specifically, it is necessary to apply plating to the recesses 18a and 18b of the rail body 16 when, for example, the rod-shaped members 20a and 20b are fixed by soldering, and it is possible to reduce costs and the like required for attaching the plating. it can.

In the present embodiment, the rail body 16 is crimped by performing a drawing process to
Since the rod members 20a and 20b are fixed in the rod members 20a and 20b, the positional accuracy of the fixed rod members 20a and 20b is good, and the rod members 20a and 20b for performing the finishing process are good.
The polishing allowance of 0b can be reduced.

It should be noted that the recesses 18a, 1
The shape of the rod-shaped members 20a and 20b fixed in the
The shape is not limited to a trapezoidal cross-section, and may be, for example, a substantially arc-shaped cross-section (see FIG. 6A), a generally dovetail-shaped cross-section that widens downward (see FIG. 6B), or a substantially elliptical cross-section (see FIG. 6C). Reference).

On the outer peripheral surface of the rod-like members 20a and 20b shown in FIGS. 6A to 6C, for example, a plurality of substantially V-shaped grooves (not shown) are formed along the longitudinal direction. It is preferable to prevent rotation of the rod-shaped members 20a and 20b in the recess by forming a knurling means (not shown) such as a knurl.

After the rod members 20a, 20b are fixed in the recesses 18a, 18b of the rail body 16 in this manner, the rod members 20a, 20b are subjected to finishing such as cutting, grinding, etc. The linear accuracy can be ensured, and the parallel accuracy of the pair of rod members 20a and 20b located on both side surfaces of the rail body 16 can be ensured.

In the above description, a case has been described in which a pair of rod members 20a and 20b are fixed to both side surfaces of the rail body 16, but only in the recesses 18a (18b) formed on one side surface of the rail body 16. Rod member 20
Of course, a (20b) may be fixed.

Further, in the present embodiment, the rail body 16 and the rod-shaped members 20a,
Although the case of performing the drawing process integrally and substantially simultaneously with the 20b is described, the drawing process may be performed by an extruding device (not shown) instead of the drawing process.

Next, a guide rail 40 according to a modified example is shown in FIG. The same components as those of the guide rail 12 shown in FIG. 1 are denoted by the same reference numerals, and a detailed description thereof will be omitted.

A guide rail 40 according to this modified example has a pair of rod-like members 4 having a substantially circular cross section in a pair of wide concave portions 44a and 44b formed on both side surfaces of a rail body 42.
It differs from the guide rail 12 shown in FIG. 1 in that it surrounds 6a and 46b and fixes them substantially in parallel. Note that other functions and effects are the same as those of the first embodiment, and a detailed description thereof will be omitted.

[0032]

According to the present invention, the following effects can be obtained.

That is, the rail body and the rod-shaped member are integrally and substantially simultaneously drawn or extruded while maintaining the state where the rod-shaped member is inserted into the recess, so that the rail body is caulked and the rail body is crimped. For example, since the rod-shaped member is fixed, the fixing operation such as brazing is not required. As a result, the manufacturing process is simplified,
Manufacturing costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a linear guide according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view of a drawing apparatus for performing a method of manufacturing a linear guide according to an embodiment of the present invention.

FIG. 3 is a perspective view showing a state where a rod-shaped member is inserted along a pair of concave portions formed on both side surfaces of the rail body.

FIG. 4 is a longitudinal sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a longitudinal sectional view after a drawing process is performed on the rail body.

FIGS. 6A to 6C are longitudinal sectional views showing modified examples of the rod-shaped member fixed in the recess of the rail body, respectively.

FIG. 7 is a partially omitted longitudinal sectional view of a guide rail according to a modification.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Linear guide 12, 40 ... Guide rail 14 ... Guide block 16, 42 ... Rail body 18a, 18b, 44a, 44b ... Concave part 20a, 20b, 46a, 46b ... Bar-shaped member 24 ... Groove part 30 ... Pulling-out apparatus 34 ... Dice 36 … Die cases 38a, 38b… Clearance

Claims (4)

[Claims] 1. A method of manufacturing a linear guide including a guide rail comprising a rail body and a rod-like member fixed in a recess of the rail body and having a sliding surface, wherein the rail body and the rod-like member are separately provided. Forming the rod-shaped member through a predetermined clearance into a recess formed in the rail body; and holding the rod-shaped member inserted into the recess while maintaining the rod-shaped member inserted therein. A step of caulking the rail body to fix the rod-shaped member in the recess by integrally or substantially simultaneously pulling or extruding the member, and performing a finishing process by cutting and / or grinding the rod-shaped member. A method for manufacturing a linear guide, comprising: 2. The manufacturing method according to claim 1, wherein the recess is formed only on both side surfaces facing each other of the rail body, or on only one side surface of the rail body. 3. The method according to claim 1, wherein a set of rod-shaped members is fixed in the recess substantially in parallel with a predetermined interval. 4. A linear guide including a guide rail composed of a rail body and a rod-shaped member having a sliding surface fixed in a recess of the rail body, wherein the rail body has a recess formed in a side surface thereof. A rod-shaped member which is integrally and substantially simultaneously drawn or extruded so that the rail body is swaged and fixed in the concave portion.