JP2927473B2 - Lightweight structural material for movable members - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structural material constituting a movable member such as an electronic component transfer table and a robot arm, and more particularly to a reduction in the weight of a structural material.

2. Description of the Related Art Movable members are used in various modes in fields requiring operations such as transport, movement, and position change of objects, including industrial robots, machine tools, and electronic component mounting devices. Naturally, it is desirable that the movable member be lightweight, but when high-speed operation is required, it is particularly necessary to reduce the weight in order to reduce the inertial mass.
Therefore, for example, in an electronic component mounting apparatus, an XY table for moving a printed board in an X-axis direction and a Y-axis direction orthogonal to each other in a horizontal plane has been made of aluminum.

However, if the movable member is made of aluminum, there is a problem that it is difficult to obtain mechanical rigidity and machining accuracy.
In addition, the movable member and peripheral members such as guides for guiding the movement are heated by heat generated by the movement of the movable member, but when the peripheral member is made of steel, the amount of thermal deformation is different, and distortion occurs. As a result, there is a problem that the operation accuracy is reduced.

An object of the first invention and the third invention of the present application is to provide a lightweight structural member for a movable member which can be manufactured extremely easily, easily obtains high rigidity and processing accuracy, and is less affected by thermal deformation.

Another object of the second invention is to enable a side plate to be easily welded to the first substrate and the second substrate of the lightweight structural member for a movable member according to the first invention.

Means for Solving the Problems The lightweight structural member for a movable member according to the first invention is: (a) a first substrate and a second substrate, each of which is made of a steel thin plate and arranged to face each other at a small distance; And (b) a thin steel plate, which is disposed between the first substrate and the second substrate so as to be orthogonal to both the substrates, and from the side surface on the first substrate side to the side surface on the second substrate side. A first middle plate having a fitting groove formed therein, and (c) a thin steel plate, which is disposed between the first substrate and the second substrate in a posture orthogonal to both the substrates, A second middle plate having a fitting groove formed from the side surface toward the side surface on the first substrate side, and the first middle plate and the second middle plate are fitted in a state where the fitting grooves are opposed to each other. The first middle plate and the second middle plate protrude laterally from both side surfaces by being merged with each other, And a fitting hole having a shape corresponding to the fitting protrusion in a state where the first substrate and the second substrate intersect with each other, while having a fitting protrusion formed so as to intersect with each other at an intersection portion between the first substrate and the second middle plate. And the first substrate and the second substrate are welded to the first intermediate plate and the second intermediate plate, respectively, at a fitting portion between the fitting protrusion and the fitting hole.

Here, steel refers to SS material, SPC material and
It is steel such as SUS material.

A light-weight structural member for a movable member according to a second aspect of the present invention includes, in addition to the components of the first aspect, a thin steel plate, at least one of which connects outer peripheral portions of the first substrate and the second substrate.
One side plate, one of the side surfaces adjacent to each other of the first substrate and the second substrate is provided with a fitting projection, and the other is provided with a cutout having a shape corresponding to the fitting projection. The projection and the notch are welded to each other at a fitting portion.

A lightweight structural material for a movable member according to a third aspect of the present invention is: (a) a first substrate and a second substrate, each of which is made of a thin steel plate and arranged to face each other at a small distance; A plurality of middle plates which are formed of a thin plate and are disposed between the first substrate and the second substrate in a posture orthogonal to both substrates; and (c) a first substrate and a second substrate which are formed of a steel thin plate. And at least one side plate connecting the outer peripheral portions of the first substrate and the second substrate, wherein each of the plurality of middle plates has a fitting protrusion protruding laterally from both side surfaces. The first substrate and the second substrate are welded to the middle plate respectively at the fitting portions of the fitting protrusions and the fitting holes, and the first substrate and the second substrate are provided. And one of the side surfaces adjacent to each other with the side plate is provided with a fitting projection, Its corresponding to the fitting protrusion with a notch shape, the fitting portions and their engagement projection and the notch and the first substrate and the second substrate is characterized by comprising been welded to the side plates, respectively.

Functions and Effects of the Invention In the lightweight structural member for a movable member according to the first to third aspects of the present invention, portions other than the middle plate are almost empty between the first substrate and the second substrate. As a result, the movable member can be made light in the same manner as when made of aluminum. In addition, since the first and second substrates and the middle plate are all made of steel, the rigidity is high and the machining accuracy can be increased. There is no difference in the amount of deformation, and a decrease in operation accuracy can be prevented.

In the lightweight structural member for a movable member according to the first to third inventions, each of the middle plates includes a fitting projection projecting laterally from both side surfaces, and the first substrate and the second substrate include: A fitting hole corresponding to each of the fitting projections is provided. With such a configuration, relative positioning of the first substrate, the second substrate, and the intermediate plate, which are performed in the welding operation, is facilitated. After the fitting protrusions of the middle plate and the fitting holes of the first substrate and the second substrate corresponding to the fitting protrusions are fitted, for example, the fitting is performed by using a gum tape or a jig dedicated to temporary assembly. It just needs to be maintained. In the temporarily assembled lightweight structural member for a movable member, the fitting portion between the fitting hole of the first substrate and the second substrate and the fitting protrusion of the middle plate is exposed to the outside. Therefore, the welding at the fitting portion can be performed from outside the lightweight structural member for the movable member after the tentative assembly, and the welding operation is significantly facilitated. Also, depending on the shape of the fitting hole of the first board and the second board and the fitting projection of the middle board and the form of welding, the fitting hole of the first board and the second board after the welding operation is completed. In this case, it can be closed by melting and re-solidification of the steel, and in that case, it is possible to prevent the concave portions from remaining on the surfaces of the first substrate and the second substrate. In order to make this welding operation easier, it is desirable to employ laser welding, TIG welding (Tungsten Inert Gas Arc Welding), or the like. As described above, the lightweight structural member for a movable member of the present invention has sufficient performance required for a movable member such as light weight and high rigidity, and simplifies the entire manufacturing operation including temporary assembly and welding operations and achieves high efficiency. It is something that can be achieved.

In the first invention, the following unique effects are obtained in addition to the effects common to the first to third inventions. In the lightweight structural member for a movable member according to the first aspect of the invention, the first middle plate and the second middle plate cross each other by being fitted with the fitting grooves facing each other. Thereby, the relative positioning of the plurality of middle plates can be easily performed, and the rigidity of the member formed of the plurality of middle plates fitted to each other can be increased. The rigidity of the entire structural material can be increased. Also,
At the intersection of the first middle plate and the second middle plate, the fitting protrusions are formed so as to intersect with each other, and the shapes of the fitting holes of the first substrate and the second substrate are such that they intersect each other. Since it is made to correspond to the projection, the relative positioning between the first substrate and the second substrate and the member composed of the plurality of middle plates fitted to each other is facilitated, and The intersecting fitting projections of the first and second middle plates can be simultaneously welded to the periphery of the fitting hole of the first substrate or the second substrate. Thereby, the first substrate or the second substrate and the three members of the first intermediate plate and the second intermediate plate are integrated at the position of the fitting hole, and the first substrate or the second substrate is The rigidity of the entire lightweight structural member for a movable member can be increased as compared with the case where the first middle plate and the second middle plate are welded at different positions.

In the lightweight structural member for a movable member according to the second aspect of the invention, in addition to the effects common to the first to third aspects and the effects specific to the first aspect, a specific effect is obtained. Since the side plate and the first board and the second board can be temporarily assembled by fitting one of the fitting projections and the other notch of the side face adjacent to each other with the first board and the second board, the first board and the second board The relative positioning between the and the side plate is facilitated, and thus the efficiency of the entire welding operation can be improved.

In the lightweight structural member for a movable member of the third invention, in addition to the effects common to the first to third inventions, the same effects as the effects unique to the second invention are obtained, and the first substrate and the second substrate The relative positioning between the and the side plate is facilitated, so that the efficiency of the entire welding operation can be improved.

Embodiment Hereinafter, an example in which the present invention is applied to an XY table for moving a printed board in an electronic component mounting apparatus will be described in detail with reference to the drawings.

In FIG. 4, reference numeral 10 denotes a base. A pair of guide rails 12 and 14 are provided on the base 10 in a direction extending in the X-axis direction (a direction perpendicular to the paper surface).
It is slidably fitted at 8,20. X axis slide
As shown in FIG. 6, reference numeral 16 denotes a U-shaped cross section, and the pair of U-shaped arms 22, 24 are supported by the guide rails 12, 14 in such a direction as to protrude upward. X-axis slide 16
As shown in FIG. 4, a bracket 26 is fixed to the lower surface of the, and a nut 28 is attached by being sandwiched between a pair of covers 30 (only one is shown in the figure). The nut 26 is screwed onto a screw shaft 32 provided on the base 10, and is moved in the X-axis direction by rotating the screw shaft 32 by an X-axis slide drive motor (not shown). A notch penetrating in the vertical direction is provided at one end on the side orthogonal to the moving direction of the X-axis slide 16 as shown in FIG.
33 are provided.

As shown in FIG. 6, a guide rail mounting base having a U-shaped cross section is provided on the upper surfaces of the arms 22 and 24 of the X-axis slide 16, respectively.
As shown in FIG. 4, the guide rails (not shown) attached to the mounts 34, 36 are fixed to the Y-axis direction (the left-right direction in FIG. The shaft slide 38 is slidably fitted between a pair of legs (not shown). On the lower surface of the Y-axis slide 38, a nut 40 is attached by a bracket 42, covers 44 and 46, and is screwed to a screw shaft 48 rotatably provided on the X-axis slide 16. It is moved in the Y-axis direction by being rotated by a Y-axis slide drive motor (not shown). A printed circuit board positioning device (not shown) is provided on the Y-axis slide 38, and the printed circuit board supported thereby is moved to an arbitrary position in the horizontal plane by the movement of the X-axis slide 16 and the Y-axis slide 38. . The X-axis slide 16 and the Y-axis slide 38 constitute an XY table.

On the upper surface of the X-axis slide 16, a Y-axis slide drive motor mounting seat 50, a screw shaft mounting seat 52 and the like are fixed as shown in FIG. 5, and on the back surface, as shown in FIG. A plurality of seats including the nut mounting seat 54 are fixed. The seats such as the screw shaft mounting seat 52 and the nut mounting seat 54 are all made of steel.

Since both the X-axis slide 16 and the Y-axis slide 38 are made of lightweight structural materials and have the same structure,
Hereinafter, the X-axis slide 16 will be representatively described.

As shown in FIG. 1, the X-axis slide 16 has a U-shaped first middle plate 60 and two large and small second middle plates 62, 6 having a rectangular shape.
3 and a connecting element 64 fitted together, an upper plate 66, 68, 70 serving as a first substrate, a lower plate 72 serving as a second substrate, and a U-shaped side plate.
74, a rectangular side plate 76, and an L-shaped side plate 77 are attached. Each of these plates 60, 62, 63, 66, 68, 70, 72, 74, 76, 77 is made of a thin steel plate. Hereinafter, each plate will be described.

The first middle plate 60 has a thickness of 0.5 mm and has a U-shape as shown in FIG. 2, and has a lower U-shaped arm at the edge on the side where the arm protrudes and at the edge on the opposite side. A plurality of rectangular fitting projections 78, 80 are formed at regular intervals. A fitting groove 82 having a depth reaching the center in the width direction of the first middle plate 60 is formed at the center of the fitting protrusion 78 formed on the edge on the side where the U-shaped arm protrudes. ing.

The second middle plate 62 has a thickness of 0.5 mm, and as shown in FIG. 3, fitting projections 84 and 86 are formed on a pair of edges extending in the longitudinal direction, respectively. At the center of the projection 86, a fitting groove 88 having a depth reaching the center of the second middle plate 62 in the width direction is formed. The third middle plate 63 has a dimension in the width direction larger than that of the second middle plate 62, but has a thickness of 0.5 mm. Similarly, fitting protrusions 84 and 86 and a fitting groove 88 are formed.

The upper plate 66 has a thickness of 1.2 mm. As shown in FIG. 1, a plurality of cross-shaped fitting holes 92 penetrating the upper plate 66 are formed at equal intervals in both the vertical and horizontal directions of the upper plate 66. A rectangular notch 94 is formed along the two sides facing. The length of one side of each cross-shaped fitting hole 92 is 10 mm, and the width is 0.7 mm. The upper plates 68 and 70 also have a thickness of 1.2 mm, a plurality of cross-shaped fitting holes 96 are formed at regular intervals along the longitudinal direction, and a plurality of rectangular cutouts 98 are equally spaced at four sides. Is formed.

The lower plate 72 has a thickness of 1.2 mm, a plurality of cross-shaped fitting holes 102 are formed at equal intervals in both the vertical and horizontal directions of the lower plate 72, and rectangular cutouts 104 are formed on four sides, respectively. Each of the through holes 106
Are formed.

Each of the side plates 74, 76, and 77 has a thickness of 1.2 mm, and has rectangular fitting projections 110, 112, and 114 formed on two opposing sides, respectively.

When making the X-axis slide 16, first, the first middle plate 60 and the second middle plates 62 and 63 are fitted on the lower plate 72. A seat such as a nut mounting seat 54 is fixed to the lower plate 72 in advance by spot welding (may be fixed by fillet welding). Fitted in the cross-shaped fitting hole 102, the second middle plates 62, 63 are disposed in a direction orthogonal to the first middle plate 60, and the fitting groove 82 of the first middle plate 60 and the second middle plate 62, The fitting grooves 88 of the 63 are fitted so as to face each other, and the fitting projections 86 are fitted into the cross-shaped fitting holes 102. As a result, the connection lattice 64 is formed on the lower plate 72, and the fitting protrusions 78, 80 of the first middle plate 60 and the fitting protrusions 84, 8 of the second middle plates 62, 63.
6 forms the cross-shaped fitting protrusion 120. A circular through hole 124 or a semicircular notch 126 is formed in a seat such as the nut mounting seat 54 as shown in FIG. 7 so as not to interfere with the cross-shaped fitting projection 120.

Next, the side plates 74, 76, 77 are fitted to the lower plate 72. The side plate 74 is
The fitting protrusion 110 is fitted into the notch 104 of the lower plate 72 at a position where the connection lattice 64 abuts on a portion of the X-axis slide 16 on which the notch 33 is not formed. Further, at a position where the side plate 76 is in contact with the long side of the rectangular connection grid 64,
The fitting protrusion 112 is fitted into the notch 104 of the lower plate 72, and the side plate 77 cuts off the fitting protrusion 114 at a position where it comes into contact with the portion of the connection lattice 64 on which the notch 33 is formed on the X-axis slide 16. Fit into 114. Although not shown, the connection grid 64
The side plate is also brought into contact with a portion between the portions with which the side plate 77 is brought into contact, and the entire side surface of the connection lattice 64 is closed. When the side plates 74, 76, 77 are fitted in this manner, the side plates 74, 76, 77 are temporarily attached to the lower plate 72 with a gum tape at portions other than the fitting portions between the fitting projections 110, 112, 114 and the notches 104.

Subsequently, the upper plates 66, 68 and 70 are fitted.
Temporarily attach 6,68,70 to the side plates 74,76,77 with the adhesive tape. Also, screw shaft mounting seats are provided on the upper plates 66, 68, 70, respectively.
The seats such as 52 and the guide rail mounts 34 and 36 are fixed in advance by spot welding (may be fixed by fillet welding). For the upper plate 66, connect the cross-shaped
While fitting into the cross-shaped fitting protrusion 120 between the U-shaped arms of 64, the fitting groove 94 is fitted into the fitting protrusions 110, 114 of the side plates 74, 77, and the upper plates 68, 70 are Connect the cruciform mating hole 96 to the grid 6
4 is fitted into the cross-shaped fitting projection 120 of the U-shaped arm portion, and the notch 98 is fitted with the fitting projection 84 of the second middle plate 63, the side plates 76, 77.
Are fitted to the fitting projections 112 and 114. Circular through holes 128 and semicircular notches 129 are also formed in the screw shaft mounting seat 52 fixed to the upper plates 66, 68, 70 and the guide rail mounting bases 34, 36, and the cross-shaped fitting protrusion 120 Interference has been avoided.

If each plate is fitted in this way, the cross-shaped fitting protrusion 120 is laser-welded to the upper plate 66, 68, 70 and the lower plate 72,
Each plate is fixed to each other. At this time, the first and second middle plates 60, 62,
Although the thickness of 63 is smaller than the width of the cross-shaped fitting holes 92, 96, 102,
Gaps between the cruciform fitting protrusion 120 and the cruciform fitting holes 92, 96, 102 are filled by welding. Also, the upper plate 66, 68, 70 and the lower plate
Notches 94, 98, 104 between 72 and side plates 74, 76, 77 and fitting projections 110, 11
Laser welding is also applied to the fitting portion with 2,114 and fixed. After welding, if there is a dimensional error in the guide rail mounts 34, 36, the upper surface of the bottom wall is grindered to remove the error. At this time, the grinding fluid applied to the X-axis slide 16 is It is discharged from the through holes 16 formed in the lower plate 72 and dried.

Although the X-axis slide 16 has been described above, the Y-axis slide 38 has the same structure and is made in the same manner. Since the slides 16 and 38 are made of a combination of thin steel plates, they are lightweight but rigid. High machining accuracy is obtained because it is high and machining is easier than aluminum. Also, there is no occurrence of distortion due to the difference in the amount of thermal deformation with the peripheral member also made of steel. Therefore, the printed circuit board can be moved at high speed and with high accuracy.

In the above embodiment, the thickness of the upper plate 66, 68, 70, the lower plate 72 and the side plates 74, 76, 77 was 1.2 mm, but 1 mm or more.
It is desirable that the thickness be 3.2 mm or less, and it is particularly desirable that the thickness be 1.2 mm or more and 1.6 mm or less. In addition, the first and second middle plates 6
The thickness of 0,62,63 was 0.5mm, but more than 0.3mm and 1.6mm
It is desirable that the thickness be 0.5 mm or more and 0.7 mm or less.

Further, the fitting portion of each plate is fixed by laser welding, but may be fixed by other welding means such as TIG (Tungsten Inert Gas Arc Welding) welding.

Further, when the upper plates 66, 68, 70 and the side plates 74, 76, 77 are fitted to the connection lattice 64, they are temporarily attached with a piece of gum tape. However, a special treatment for keeping the respective plates fitted together. A tool may be used to perform fitting and welding on the jig.

Furthermore, the upper plate 66, 68, 70 and the lower plate 72 and the side plates 74, 76,
The welding with 77 may be performed not only on the fitting portions between the notches 94, 98, 104 and the fitting protrusions 110, 112, 114, but also on the entire portion fitted with each other.

Further, in the above embodiment, the first and second middle plates, which are the middle plates, are fitted and connected to each other, but a plurality of middle plates may be provided apart. For example, a cylindrical member as an intermediate plate may be made of a steel thin plate, and may be welded side by side in a staggered manner between two thin plates.

Further, the present invention can be applied not only to the XY table moving in the X-axis direction and the Y-axis direction, but also to a member attached to the XY table. The present invention can be applied not only to the positioning device but also to various movable members such as a robot arm and a slide for transferring electronic components.

In addition, without departing from the scope of the claims, the present invention can be implemented in various modified and improved forms based on the knowledge of those skilled in the art.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an X-axis slide of an XY table for moving a printed circuit board according to one embodiment of the present invention. FIG. 2 is a front view of a first middle plate constituting the X-axis slide, and FIG. 3 is a front view of a second middle plate. FIG. 4 is a front view (partial cross section) showing the XY table. Fifth
The figure is a plan view of the X-axis slide, FIG. 6 is a side view, and FIG.
The figure is a bottom view. 16: X-axis slide, 38: Y-axis slide 60: First middle plate, 62, 63: Second middle plate 66, 68, 70: Upper plate, 72: Lower plate 78, 80: Fitting projection, 82: Fitting Mating groove 84,86: Mating protrusion, 88: Mating groove 92,96,102: Cross-shaped fitting hole 104: Through hole, 120: Cross-shaped fitting protrusion

Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI H05K 13/00 H05K 13/00 Z (72) Inventor Fumiharu Yokoi 19 Chauyama, Yamamachi, Chiryu-shi, Aichi Fuji Machinery Co., Ltd. ( 56) References JP-A-56-45344 (JP, A) JP-A-63-177983 (JP, A) JP-A-58-71491 (JP, A) JP-A-2-205620 (JP, A) JP-A-63-242472 (JP, A) JP-A-61-245974 (JP, A) JP-A-2-280964 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B23K 9 / 00 501 B23K 33/00-33/00 310 B23Q 1/00-1/76 B25J 18/00 F16S 1/04 E04B 1/58 512 E04C 2/36 H05K 13/00

Claims (3)

(57) [Claims] A first substrate and a second substrate, each of which is made of a steel thin plate and is disposed to face each other at a small distance; and a first substrate and a second substrate which are made of a steel thin plate. A first middle plate in which a fitting groove is formed between a side surface on the first substrate side and a side surface on the second substrate side, which is disposed in a posture orthogonal to both the substrates, and a steel thin plate, A second middle plate in which a fitting groove is formed between the one substrate and the second substrate in a posture orthogonal to both the substrates, and a fitting groove is formed from the side surface on the second substrate side to the side surface on the first substrate side. Including, the first middle plate and the second middle plate are intersected with each other by being fitted in a state where the fitting grooves are opposed to each other, and each of the first middle plate and the second middle plate is Fitting protrusions projecting sideways from both side surfaces and formed so as to intersect each other at the intersection of the first middle plate and the second middle plate While equipped with a,
The first substrate and the second substrate are provided with a fitting hole having a shape corresponding to the fitting protrusion in a state where they intersect, and the first substrate and the second substrate are provided at a fitting portion between the fitting protrusion and the fitting hole. Are welded to the first intermediate plate and the second intermediate plate, respectively. 2. The apparatus according to claim 1, further comprising at least one side plate formed of a steel thin plate and connecting outer peripheral portions of said first substrate and said second substrate. One of the side surfaces adjacent to each other has a fitting protrusion,
2. The lightweight structural member for a movable member according to claim 1, wherein the other has a cutout having a shape corresponding to the fitting projection, and is welded to each other at a fitting portion between the fitting projection and the notch. . 3. A first substrate and a second substrate, each of which is made of a steel thin plate and arranged at a small distance from each other so as to face each other; A plurality of middle plates disposed in a posture orthogonal to both the substrates, and at least one side plate formed of a steel thin plate and connecting the outer peripheral portions of the first substrate and the second substrate. Each of the plurality of middle plates has a fitting protrusion protruding laterally from both side surfaces, while the first substrate and the second substrate have fitting holes corresponding to each of the fitting protrusions, and the fitting protrusions At the fitting portion with the fitting hole, the first board and the second board are welded to the middle board, respectively, and one of the side faces of the first board and the second board and the side board adjacent to each other is fitted with the fitting protrusion. The other has a notch of the shape corresponding to the fitting projection. , The movable member for lightweight structural material, characterized in that the fitting portions and their engagement projection and the notch and the first substrate and the second substrate is formed by welding the side plates, respectively.