JP2009180353A - Unit of movement guiding device and method for manufacturing the unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a unit of a movement guiding device having high precision. <P>SOLUTION: The unit of the movement guiding device equipped with a base as the reference for installation, a runway rail mounted on the base and having at the outside surface a rolling element running groove extending in the longitudinal direction, and a moving block installed on the rail in such a way as to be able to make relative movement through a plurality of rolling elements, is formed through the procedures including the joining process (step S12) to join the material for the runway rail with the base and the machining process (step S13) to form the rolling element running groove by machining the material on the basis of the reference of the base. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a motion guide device unit and a manufacturing method thereof, and particularly relates to a technique for realizing a motion guide device unit with high accuracy.

  2. Description of the Related Art Conventionally, for example, a motion guide apparatus as shown in FIG. 5 is known as a machine element part that moves a linear motion portion of a machine lightly and accurately. The configuration of this type of motion guide device will be described with reference to FIG. 5. A motion guide device 40 according to the prior art includes a track rail 41 and balls 42... Installed as a number of rolling elements on the track rail 41. And a moving block 43 attached so as to freely reciprocate. The track rail 41 is a long member whose cross section perpendicular to the longitudinal direction is formed in a substantially rectangular shape, and the rolling element rolling groove that becomes the track when the ball 42 rolls on the surface (upper surface and both side surfaces). 41 a... Are formed over the entire length of the track rail 41. The track rail 41 may be formed to extend linearly or may be formed to extend in a curved manner.

  On the other hand, the moving block 43 includes a moving block main body 43a made of a metal material, and a pair of end plates 43b and 43b made of a resin material installed on both end surfaces in the moving direction of the moving block main body 43a. ing. The moving block body 43a is provided with load rolling element rolling grooves 43c at positions corresponding to the rolling element rolling grooves 41a. The rolling element rolling grooves 41a of the track rail 41 and the loaded rolling element rolling grooves 43c formed in the moving block main body 43a form a loaded rolling element rolling path 52, and a plurality of the rolling element rolling paths 52 introduced into the passage. The balls 42 roll while receiving a load. Further, the moving block main body 43a includes unloaded rolling element rolling paths 53 extending in parallel with the loaded rolling element rolling grooves 43c. Further, each of the pair of end plates 43b, 43b is provided with a direction changing path 55 that connects the unloaded rolling element rolling paths 53 to the loaded rolling element rolling paths 52. The combination of one loaded rolling element rolling path 52 and no-load rolling element rolling path 53 and a pair of direction changing paths 55, 55 connecting them constitutes one infinite circulation path (in FIG. 5). (See (b)).

  A plurality of balls 42 are installed in an infinite circulation path composed of a loaded rolling element rolling path 52, an unloaded rolling element rolling path 53, and a pair of direction changing paths 55, 55 so that infinite circulation is possible. A reciprocating motion of the moving block 43 relative to the track rail 41 is possible.

  In the conventional motion guide device 40 having the above-described configuration, the mounting is performed using bolt holes 41b and 43d formed in the track rail 41 and the moving block 43, respectively. For example, when the track rail 41 is installed on a base (not shown) as a reference for attachment, a plurality of bolt holes 41b formed at intervals in the longitudinal direction of the track rail 41 are used, and the bolt holes 41b are used. Is fixed and installed by a fastening force of a bolt screwed to a base (not shown).

  However, in the method in which the track rail 41 is fixedly installed using a bolt, the track rail 41 may be distorted due to the fastening force of the bolt, and this distortion adversely affects the waving characteristics, etc. There was a possibility of lowering. In addition, in such a conventional method, since the installation accuracy greatly varies depending on the bolt tightening method, there has been a problem that skill is required for installation work of the motion guide device unit. Furthermore, when the track rail 41 is used vertically or upside down, a difference in rail deformation is seen between the bolt fastening portion and the other portions, and the accuracy is not stable. Furthermore, since the accuracy on the base side and the accuracy error on the track rail 41 side accumulate, it is difficult to obtain a highly accurate guide structure using the conventional technique.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to realize a motion guide apparatus unit having a level of accuracy that is impossible with the prior art.

  The motion guide device unit according to the present invention includes a base that is an installation reference, a track rail that is installed on the base, and a moving block that is assembled to the track rail so as to be relatively movable via a plurality of rolling elements. It is a motion guide device unit, and a rolling element rolling groove extending in a longitudinal direction is formed on an outer surface of the track rail, and the rolling element rolling groove joins a track rail material to the base. Then, it is formed by processing the track rail material based on the reference of the base.

  In the motion guide device unit according to the present invention, the track rail may be joined to the base by laser brazing.

  In the motion guide device unit according to the present invention, the base may include a positioning shape for positioning the track rail material.

  Furthermore, in the motion guide device unit according to the present invention, the rolling member rolling groove and the joint portion of the track rail by the laser brazing may be formed on the track rail with a space therebetween. it can.

  A motion guide device unit manufacturing method according to the present invention includes a base that is an installation reference, a track rail that is installed on the base and has rolling element rolling grooves that extend in the longitudinal direction on the outer surface thereof, and the track rail. And a moving block that is assembled so as to be relatively movable via a plurality of rolling elements, a joining step of joining a track rail material to the base, and a reference for the base The track rail is formed by performing a process including a machining step of machining and forming the rolling element rolling groove by machining the track rail material based on the above.

  In the method for manufacturing a motion guide device unit according to the present invention, the track rail material to be joined to the base in the joining step may be joined by laser brazing.

  In the method of manufacturing a motion guide device unit according to the present invention, the base includes a positioning shape for positioning the track rail material, and the joining step positions the track rail material by the positioning shape. Then, it can be performed by joining a track rail material to the base.

  According to the present invention, since the track rail can be installed without using a bolt, the track rail is not distorted.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described with reference to the drawings. The following embodiments do not limit the invention according to each claim, and all combinations of features described in the embodiments are not necessarily essential to the solution means of the invention. In addition, members that are the same as or similar to the conventional members described in the Background Art section may be assigned the same reference numerals and description thereof may be omitted.

  First, the manufacturing method of the exercise | movement guide apparatus unit which concerns on this embodiment is demonstrated using FIG. 1 thru | or FIG. Here, FIG. 1 is a flowchart for explaining a method of manufacturing the motion guide device unit according to the present embodiment. 2 and 3 are views showing the form of the motion guide device unit according to the present embodiment in the manufacturing stage. In particular, FIG. 2 shows the appearance of the joined state between the base and the track rail, and FIG. The joining state of the base and track rail in the cross section orthogonal to the longitudinal direction of the track rail is shown.

  In the method of manufacturing the motion guide device unit according to the present embodiment, first, a rail material is manufactured as a rail manufacturing process (step S10). The track rail material is formed as a track rail 41 by, for example, performing a drawing process on a rod-shaped metal material, and then performing induction hardening and tempering on the periphery where the rolling element rolling groove 41a is formed, and further performing four-surface grinding. This is a member in which an approximate outer shape is formed.

  Next, as a positioning step, the groove 11 for installing the track rail material is processed and formed with respect to the base 10 serving as an installation reference (step S11). In the case of the motion guide device unit illustrated in FIG. 2, there are two track rails 41 installed on the base 10, and the two grooves 11 are processed according to the installation positions of the two track rails 41. Yes.

  The groove 11 functions as a positioning shape for positioning the track rail material, and the gap between the track rail material and the groove 11 when the track rail material is fitted into the groove 11 is less than 1 mm. It is managed. By this gap management, an appropriate amount of heat from the laser reaches the brazing material 12 to be supplied for bonding later. Further, the boundary surface between the track rail material and the base 10 when the track rail material is fitted into the groove 11 is configured as an approximately 90 ° region sandwiched between the side surface of the track rail material and the upper surface of the base 10. The brazing material 12 is supplied to this region.

  Subsequently, as a joining process, joining by track brazing is performed over the entire length of the track rail material with respect to the track rail material positioned and fitted to the groove 11 of the base 10 (joining process). : Step S12). The bonding at this time is performed while controlling the speed of a laser that can be partially heated for a time, and the brazing material 12 to be used is a material having a very low melting point relative to the base material. The occurrence of the heat affected zone on the rail material and the base 10 can be minimized, which is very suitable (see FIG. 3). Further, by applying the laser brazing technique, the brazing material 12 can be stably supplied over the entire length of the track rail material, so that stable and strong bonding is realized (see FIG. 3).

  As shown in detail in FIG. 3, the rolling element rolling grooves 41 a of the track rail 41 according to the present embodiment are formed on both upper side surfaces of the track rail 41. On the other hand, the locations where the track rail 41 and the base 10 are joined by laser brazing are the lower side surfaces of the track rail 41. That is, on the track rail 41, the formation position of the rolling element rolling groove 41a and the application position of the brazing material 12 by laser brazing are positions spaced apart from each other and corresponding positions. It has become. By adopting such a configuration, the thermal influence due to the laser brazing is not exerted on the rolling element rolling groove 41a, and the deformation due to the thermal stress is symmetrical with respect to the rolling element rolling groove 41a, or It can be a kinematic position. Therefore, according to the present embodiment, it is possible to minimize the influence on the rolling element rolling groove 41a that may be caused by a thermal effect.

  Finally, as a machining process, the rolling element rolling groove 41a is machined and formed on the track rail material based on the base 10 standard to complete the motion guide device unit (machining process: step S13).

  Since the motion guide device unit according to the present embodiment is manufactured through the processes described above, it eliminates the accumulation of mounting errors and base and track rail machining errors that existed in the motion guide device unit of the prior art. There is only the machining error of the entire motion guide unit present. However, since recent machining techniques are very excellent, the installation accuracy of this embodiment is very high, and as a result, it is possible to provide a motion guide device unit having high accuracy. ing.

  Moreover, since the track rail 41 according to the present embodiment does not require a bolt for installation on the base 10, the occurrence of strain can be made substantially zero. Further, the track rail 41 according to the present embodiment is finished after being installed on the base 10 and further joined to the entire length of the rail, so that the straightness of the track rail 41 is higher than that of the prior art. Has improved dramatically.

  Further, in the laser brazing joining, since the heat affected zone generated in the track rail 41 and the base 10 is minimized and the deformation of the base material is small, stable guidance accuracy can be exhibited. Laser brazing joining is very suitable because the selection range of materials to be joined is expanded (for example, aluminum casting). Further, laser brazing bonding has an advantage that partial heating bonding is possible.

  Furthermore, in the track rail 41 according to the present embodiment, it is not necessary to form a bolt hole for attachment, so that the sealing performance of the rail upper surface is dramatically improved. Such a configuration also exhibits the effect of preventing the intrusion of foreign matter into the moving block 43, and a motion guide device unit having a longer life than that of the prior art can be obtained.

  The movement guide apparatus unit according to this embodiment is completed by assembling the moving block 43 similar to that described in the prior art to the track rail 41 formed as described above.

  FIG. 4 exemplifies a motion guide device unit in a form to which the present invention can be preferably applied. That is, when the shape of the base 20 is a prismatic member having a through hole as shown in FIG. 4, it is difficult to form a bolt hole for attaching the track rail on its upper surface, The technique of using and fixing the track rail 41 to be used is difficult to apply to the base 20 having such a configuration. However, according to the method of the present invention, the track rail 41 can be fixedly installed on the base 20 having the shape shown in FIG. Therefore, it can be said that the method of the present invention is a technology with wide applicability that can be applied to any shape of motion guide device unit. The object 21 can be guided with high accuracy.

  As mentioned above, although preferred embodiment of this invention was described, the technical scope of this invention is not limited to the range as described in the said embodiment. Various modifications or improvements can be added to the embodiment. For example, in the embodiment described above, the case where the positioning shape formed on the base 10 is formed as the groove 11 has been described as an example. However, the positioning shape according to the present invention is formed to extend in the longitudinal direction of the base 10 described above. The groove 11 is not limited to the groove 11, and any groove can be used as long as the track rail material can be positioned. For example, since the track rail material can be positioned by determining two points or one surface, it may be in the shape of two protrusions protruding from the upper surface of the base 10, or a step shape that engages only one side of the track rail material. It may be something like

  Further, the shape of the base 10 is not limited to that shown in the figure, and any shape can be adopted (for example, the shape of the cross section perpendicular to the longitudinal direction is substantially rectangular as shown in FIG. 2). However, the present invention can be applied to a U-shaped section, an L-shaped section, and the like.

  Furthermore, with regard to the laser brazing technology used for joining the base and the track rail material, the optimum laser output, brazing material, head feed speed, wire feed speed, etc., depending on the base material conditions and shape of the object to be joined, etc. Known conditions may be appropriately selected.

  It is apparent from the description of the scope of claims that embodiments with such changes or improvements can be included in the technical scope of the present invention.

It is a flowchart for demonstrating the manufacturing method of the exercise | movement guide apparatus unit which concerns on this embodiment. It is a figure which shows the form in the manufacture stage of the movement guide apparatus unit which concerns on this embodiment, and has shown the external appearance of the joining state of a base and a track rail especially. It is a figure which shows the form in the manufacture stage of the exercise | movement guide apparatus unit which concerns on this embodiment, and has shown especially the joining state of the base and track rail in the cross section orthogonal to the longitudinal direction of a track rail. It is a figure which illustrates one form of the exercise | movement guide apparatus unit which can apply this invention. It is a figure which illustrates one form of the motion guide apparatus unit based on a prior art, (a) shows an external appearance perspective view, (b) in the figure is an infinite circulation with which the motion guide apparatus unit shown by (a) is equipped. It is sectional drawing for demonstrating a path | route.

Explanation of symbols

  10, 20 base, 11 groove, 12 brazing material, 21 guided object, 40 (related to the prior art) motion guide device, 41 track rail, 41a rolling element rolling groove, 41b, 43d bolt hole, 42 ball, 43 Moving block, 43a Moving block main body part, 43b End plate, 43c Loaded rolling element rolling groove, 52 Loaded rolling element rolling path, 53 Unloaded rolling element rolling path, 55 direction turning path.

Claims (7)

The base that is the installation standard,
A track rail installed on the base;
A moving block assembled to the track rail so as to be relatively movable via a plurality of rolling elements;
In an exercise guidance device unit comprising:
In the track rail, a rolling element rolling groove extending in the longitudinal direction is formed on the outer surface,
The rolling element rolling groove is formed by joining the track rail material to the base and then processing the track rail material based on the reference of the base. unit. The motion guide device unit according to claim 1,
The motion guide device unit, wherein the track rail is joined to the base by laser brazing. In the exercise | movement guide apparatus unit of Claim 1 or 2,
The motion guide device unit, wherein the base has a positioning shape for positioning the track rail material. In the exercise | movement guide apparatus unit of any one of Claims 1-3,
The motion guide device unit, wherein the rolling member rolling groove and the track rail joining portion formed by the laser brazing are formed on the track rail with a space therebetween. The base that is the installation standard,
A track rail installed on the base and having rolling element rolling grooves extending in the longitudinal direction on the outer surface thereof,
A moving block assembled to the track rail so as to be relatively movable via a plurality of rolling elements;
A method of manufacturing a motion guidance device unit comprising:
A joining step of joining the track rail material to the base;
By processing the rolling rail rolling groove by processing the track rail material based on the base standard,
The track guide rail is formed by executing a process including: a method for manufacturing a motion guide device unit. In the manufacturing method of the motion guidance device unit according to claim 5,
The method of manufacturing a motion guide device unit, wherein the track rail material joined to the base in the joining step is joined by laser brazing. In the manufacturing method of the movement guide apparatus unit according to claim 5 or 6,
The base has a positioning shape for positioning the track rail material,
The said joining process is performed by positioning the said track rail raw material with the said positioning shape, and joining a track rail raw material with respect to the said base, The manufacturing method of the motion guide apparatus unit characterized by the above-mentioned.

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