JP2002052430A - Work fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a thin and uniform adhesive layer at a designated pressure and in a short time. SOLUTION: This work fixing device is provided with a face plate having a work surface for bonding and fixing a work using a hot melt adhesive, a heating and cooling means for selectively heating and cooling the face plate, and one or more grooves formed in the work surface to receive surplus adhesive. When the work is pressed to the molten adhesive, surplus adhesive enters the near groove before being extruded to the end of the work.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for releasably bonding a workpiece to a work surface using a hot melt adhesive.

[0002]

2. Description of the Related Art As one of such workpiece fixing devices,
There is one described in JP-A-10-230428. The work fixing device has a work surface for releasably adsorbing the work, and the work surface is a uniform flat surface.

[0003] In this fixing device, a hot melt adhesive is melt-coated on a work surface, and then the work is pressed against the adhesive with a predetermined pressure, so that excess adhesive is applied to the end of the work. By extruding, the thickness of the adhesive layer is adjusted to be thin and uniform. Thereafter, the fixing device fixes the workpiece to the work surface by cooling the face plate having the work surface in such a state, thereby solidifying the hot melt adhesive on the work surface.

[0004] Because hot melt adhesives are relatively viscous liquids when melted, extruding excess adhesive to the edge of the workpiece requires a large amount of pressure and a long time. In particular, when the workpiece is large, the distance over which the excess adhesive is extruded becomes large, and requires higher pressure and longer time.

If the adhesive is rapidly cooled and solidified without applying sufficient pressure and sufficient time, the thickness of the adhesive layer becomes too large or uneven, and as a result, the adhesive layer The adhesive strength is reduced. In addition, if the amount of the adhesive to be applied is insufficient, the bonding area of the workpiece becomes small, and the bonding strength also decreases.

[0006] Further, the volume of the hot melt adhesive is reduced by cooling and solidifying it from a molten state. Because of this, due to the uneven cooling of the adhesive layer,
Although the volume decrease of the adhesive at the previously solidified portion will be compensated by the unsolidified portion of the adhesive at that point in time, the volume decrease of the subsequently solidified portion will not be compensated. Adhesion failure, such as cracking of the adhesive layer, occurs due to insufficient adhesive, and the adhesive strength is further reduced.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to enable a thin and uniform adhesive layer to be formed at a predetermined pressure and in a short time.

[0008] Another object of the present invention is to minimize a decrease in adhesive strength.

[0009]

A work fixing device according to the present invention comprises:
A face plate having a work surface for bonding and fixing a workpiece using a hot melt adhesive; heating and cooling means for selectively heating and cooling the face plate; and one or more grooves formed on the work surface, And a groove for receiving a suitable adhesive.

When the work piece is fixed to the work surface, a hot melt adhesive is applied to the work surface in a molten state, the work piece is pressed against the adhesive with a predetermined pressure from above, and then the face plate is heated and cooled by heating and cooling means. Upon cooling, the adhesive solidifies. Thereby, the workpiece is fixed to the work surface.

When the workpiece is pressed against the molten adhesive, the excess adhesive is extruded toward the edge of the workpiece. However, much of the excess adhesive gets into the intermediate grooves before being pushed to the end of the workpiece.
Thus, the excess adhesive is extruded into a nearby groove without being extruded to the end of the workpiece.

As a result, according to the present invention, regardless of the size of the workpiece, the adhesive layer can be adjusted to a uniform thickness with a predetermined pressure and in a short time, and the adhesive strength can be adjusted. Is improved.

When the workpiece is removed from the work surface, the face plate is heated by the heating and cooling means, thereby melting the adhesive. In this state, the workpiece can be removed from the work surface.

In a preferred embodiment, the groove is
A plurality of grooves that do not intersect, and are formed on the work surface at intervals in one direction. In another preferred embodiment, the groove is a plurality of intersecting grooves and divides the work surface into a plurality of sections.

The heating / cooling means includes a fluid passage formed in the surface slope to allow at least a cooling medium to pass therethrough, and a distance from the fluid passage to the work surface is smaller than a distance from the fluid passage to the groove. can do.
By doing so, the work surface is cooled first from a location far from the groove, and solidification starts from the adhesive at that location, and solidification of the adhesive proceeds toward a location near the groove. As a result, the volume decrease due to the solidification of the adhesive is compensated by the extra solidified adhesive extruded into the groove being returned to the adhesive layer again, so that the adhesive layer is prevented from cracking, etc. The occurrence of shortage is prevented.

The fluid passage can be used as a fluid passage through which a heating medium passes. In this case, the heating of the adhesive layer on the work surface is performed from near the work surface, and the work piece can be released in a short time.

The heating medium may include a fluid which is introduced into the fluid passage in a gaseous state, then condenses on the inner surface of the fluid passage to release latent heat, and uses the latent heat for heating the face plate. . By doing so, the face plate can be heated by the latent heat of the cooling medium, and the workpiece can be quickly released.

[0018] The heating medium may include water. In this way, the face plate can be heated using the large latent heat of water, which is cheaper and easier to handle than other fluids, and the workpiece can be released very quickly.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIGS. 1 to 5, a workpiece fixing device 10 uses a chuck for releasably fixing a workpiece 12. As shown in FIG. The workpiece fixing device 10 includes a flat face plate 14 having a rectangular flat shape and a thick flat base 1.
6 and a flat heat insulating material 18 having a rectangular planar shape.
Are assembled with appropriate connecting means such as bolts.

The face plate 14 is made of a material having thermal conductivity and heat resistance, preferably a metal material. One surface (ie, upper surface) 20 of the face plate 14 is
The work surface has a plurality of grooves 22 formed on a flat surface for releasably fixing the groove. The other surface (that is, the lower surface) of the face plate 14 is a flat surface.

When the workpiece 12 is releasably fixed as described later, a hot melt adhesive 24 for releasably fixing the workpiece 12 is applied to the upper surface, that is, the width direction of the work surface 20. You.

The groove 22 is open to the work surface 20,
As will be described later, the excess hot melt adhesive 26
Having a size that can accept. In the illustrated example, the groove 22 extends in the longitudinal direction of the work surface 20 at a predetermined interval in the width direction of the work surface 20, and has a U-shaped cross-sectional shape.

A plurality of fluid passages 28 are formed in the face plate 14. The fluid passage 28 extends in the longitudinal direction of the face plate 14 at a predetermined interval in the width direction of the face plate 14. The fluid passage 28 located at one end in the width direction of the face plate 14 is communicated with a fluid inlet 30, and the fluid passage 28 located at the other end in the width direction of the face plate 14 is communicated with a fluid outlet 32.

Adjacent fluid passages 28 are interconnected by connection passages 34 such that the fluid heating and cooling media introduced from fluid inlets 30 flow out of fluid outlets 32 through all fluid passages 28. ing.

In the illustrated example, each fluid passage 28 extends between adjacent grooves 22 in plan view. Further, as shown in FIG. 5, each fluid passage 28 is formed at a position where the distance a from the fluid passage 28 to the work surface 20 is smaller than the distance b from the fluid passage 28 to the groove 22.

The nipple forming the fluid inlet 30 and the fluid outlet 32 is formed by connecting one of the nipples 32 from the face plate 14 through the heat insulating material 18 and the base 16 as shown in FIG.
6 protrudes to the side.

When the workpiece 12 is releasably fixed to the work surface 20, a hot melt adhesive 24 is applied in a molten state to the work surface 20, and the work 12 is pressed onto the adhesive 24 from above by a predetermined pressure. Is done. The excess adhesive 26 is pushed toward the end of the workpiece 12 by the pressing force at this time.

However, as shown in FIG. 5, the excess adhesive 36 near the outer peripheral portion of the workpiece 12 is pushed out of the workpiece 12, while the other excess adhesive 26 remains in the nearby groove 22. Extruded (ie, pushed). In particular, excess adhesive 26 in the central region of work surface 20 is extruded into intervening groove 22 before being extruded to the edge of workpiece 12.

For example, the excess adhesive present at the position X in FIG. 1 may cause the distance Y from the position X to the nearby groove 22 to be shorter than the distance Z from the position X to the edge of the workpiece 12. Without being pushed out to the edge of the object 12,
It enters the nearby groove 22. As a result, an adhesive layer having a predetermined thickness dimension d (see FIG. 5) is formed between the work surface 20 and the lower surface of the workpiece 12.

Before starting the above work or during the above work,
A heating medium such as heating water or steam may be supplied from the fluid inlet 30 to the fluid passage 28 to heat the face plate 14. By doing so, the adhesives 24, 26, 28 are kept highly fluid.

Thereafter, a cooling medium such as cooled water is supplied to the fluid passage 28 from the fluid inlet 30. The cooling medium is supplied from the fluid inlet 30 through the fluid passage 28 to the fluid outlet 3.
Flow out of 2. Thereby, the face plate 14 is cooled,
Since the adhesive 24 is solidified, the workpiece 12 is
Is fixed to the work surface 20.

When the workpiece 12 is removed from the work surface 20, a heating medium, such as water vapor, is supplied from the fluid inlet 30 to the fluid passage 28. The heating medium is supplied from the fluid inlet 30.
The fluid flows out of the fluid outlet 32 through the fluid passage 28. Water constituting steam is inexpensive and easy to handle as compared with other fluids, and generates a large latent heat of about 450 cal / g. Such a heating medium is provided in the fluid passage 2
8 condenses on the inner surface to release latent heat, and the latent heat heats the face plate 14. Thereby, the adhesive 24 is applied to the workpiece 12.
Is quickly melted to a state where it can be removed from the work surface 20.

The adhesive 24 decreases in volume as it cools and solidifies from a molten state. However, since a <b as shown in FIG. 5, the cooling and solidification of the adhesive 24
Starting from the adhesive at a location far from the groove 22 and proceeding toward the adhesive at a location on the groove 22 side. For this reason, the decrease in the volume of the adhesive is compensated for by the extra adhesive 26 in the groove 22 being pulled back, so that the occurrence of defective bonding due to cracks in the adhesive layer is prevented.

The amount of the excess adhesive 26 remaining in the groove 22 is gradually increased by applying the adhesive to the work surface 20 and fixing and releasing the workpiece 12 a plurality of times. The adhesive is gradually moved toward the outside of the workpiece 12 in the groove 22 by performing the application of the adhesive and the fixing and releasing of the workpiece 12 a plurality of times. Accordingly, the thickness of the adhesive layer is increased due to an increase in the amount of the excess adhesive 26 in the groove 22, thereby preventing inconvenience resulting in insufficient adhesive strength.

As described above, according to the workpiece fixing device 10, the layer of the adhesive 24 is formed to a uniform thickness at a predetermined pressure and in a short time, regardless of the size of the workpiece 12. In addition, the bonding force is improved, and the processing accuracy of the workpiece 12 by the machine tool is improved.

The grooves for receiving the extra adhesive are spaced apart in the longitudinal direction of the work surface 20 as long as the grooves are large enough to receive the extra adhesive 26.
May be extended in the width direction, or the work surface 20 may be extended vertically and horizontally, and may have an appropriate cross-sectional shape such as a V-shape, a U-shape, or a W-shape.

Regardless of the type of groove, the work surface 2
The groove may reach the zero edge. In this case, a space for receiving the adhesive flowing to the edge of the work surface in the groove may be formed in the face plate or another member, or a member having such a space may be provided in the workpiece fixing device. .

The cross-sectional shapes of the fluid passages for the heating medium and the cooling medium may be other cross-sectional shapes such as a polygon such as a square or a hexagon, an oval, an ellipse, a semicircle, or a combination thereof. Is also good.

Referring to FIGS. 6 to 8, the work fixing device 40 includes a plurality of grooves 42 extending over the entire width of the work surface 20 having a V-shaped cross section. The grooves 4 are formed at predetermined intervals in the direction.
2 accepts extra adhesive. The fluid passage 44 has a bell-shaped cross-sectional shape combining a semicircle and a square.

The workpiece fixing device 40 forms a plurality of fluid passages 44 in the face plate 14 extending in the width direction of the face plate 14 between the adjacent grooves 42 in a plan view, and connects the adjacent fluid passages 44 to the connection passages 46. Are in communication with each other. The heating medium and the cooling medium are introduced from the fluid inlet 30 into the fluid passage 44 located at one end, and flow out of the fluid outlet 32 through all the fluid passages 44.

The fluid passage 44 communicated with the fluid inlet 30 and the fluid passage 44 communicated with the fluid outlet 32 are open to the side surface of the face plate 14, respectively, and their openings are arranged in them. It is closed by a stopper 48 in a liquid-tight manner. The face plate 14 and the base 16 are assembled with a plurality of bolts 50 with the heat insulating material 18 interposed therebetween.

Each fluid passage 44 is also formed at a position where the distance from the fluid passage 44 to the work surface 20 is larger than the distance from the fluid passage 44 to the groove 42. Further, the workpiece fixing device 40 is used in the same manner as the workpiece fixing device 10, and has the same operation and effect as the workpiece fixing device 10. Although the workpiece fixing devices 10 and 40 both use a plurality of grooves that do not intersect, a plurality of grooves that intersect each other may be used.

Referring to FIGS. 9 and 10, the work fixing device 60 includes a plurality of grooves 6 extending in the longitudinal direction of the work surface 20.
2, a plurality of grooves 64 extending in the width direction of the work surface 20 are formed in the work surface 20, and the grooves 62 and 64 intersect with each other, and a fluid passage 66 having a rectangular cross-sectional shape is used. Except for this, it is formed in the same manner as the workpiece fixing device 40.

Each of the fluid passages 66 is also formed at a position where the distance from the fluid passage 66 to the work surface 20 is smaller than the distance from the fluid passage 66 to the groove 62. Adjacent fluid passages 66 are connected by a connection passage (not shown).

The work fixing device 60 is also the work fixing device 1.
It is used in the same manner as 0 and 40, and produces the same operation and effect as the workpiece fixing device 10.

In each of the above embodiments, the holes formed directly in the face plate 14 are used as the fluid passages. However, a plurality of main pipes and connecting pipes connecting adjacent main pipes are connected to the face plate 14.
And the main pipe may be a fluid passage. Also,
The work fixing device of the present invention is used not only by attaching itself to a machine tool, but also as a device that repeatedly fixes and releases a work, such as using itself as a reference stand, a support stand, or the like. Can be.

The present invention is not limited to the above embodiment. The present invention can be variously modified without departing from the gist thereof.

[Brief description of the drawings]

FIG. 1 is a plan view showing a first embodiment of a workpiece fixing device according to the present invention.

FIG. 2 is a partial sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG.

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

FIG. 5 is an enlarged view of a circular portion 5 in FIG.

FIG. 6 is a plan view showing a second embodiment of the workpiece fixing device according to the present invention.

FIG. 7 is a sectional view taken along the line 7-7 in FIG. 6;

FIG. 8 is a sectional view taken along line 8-8 in FIG. 7;

FIG. 9 is a plan view showing a third embodiment of the workpiece fixing device according to the present invention.

FIG. 10 is a sectional view taken along the line 10-10 in FIG. 9;

[Explanation of symbols]

 10, 40, 60 Workpiece fixing device 12 Workpiece 14 Face plate 16 Base 18 Insulation material 22, 42, 62, 64 Groove 20 Work surface 24 Adhesive 26 Extra adhesive 28, 44, 66 Fluid passage 30 Fluid inlet 32 Fluid outlet 34, 46 Connection passage

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kiyoshi Tanaka 1111 Uedahara Ueda-shi, Nagano Prefecture Inside Kanetec Co., Ltd. F-term (reference) 3C016 DA15

Claims (7)

[Claims] 1. A face plate having a work surface for adhering and fixing a workpiece using a hot melt adhesive, a heating and cooling means for selectively heating and cooling the face plate, and at least one of the work surfaces formed on the work surface A groove for receiving excess adhesive. 2. The groove is a plurality of grooves that do not intersect,
The workpiece fixing device according to claim 1, wherein the work fixing device is formed on the work surface at an interval in one direction. 3. The workpiece fixing device according to claim 1, wherein the groove is a plurality of intersecting grooves, and the work surface is divided into a plurality of sections. 4. The heating and cooling means includes a fluid passage formed in the surface slope to allow at least a cooling medium to pass therethrough, and a distance from the fluid passage to the work surface is a distance from the fluid passage to the groove. 4. A workpiece fixing device according to any one of claims 1 to 3, which is smaller. 5. The workpiece fixing device according to claim 4, wherein the fluid passage is further used as a fluid passage through which a heating medium passes. 6. The heating medium, after being introduced into the fluid passage in a gaseous state, includes a fluid that condenses on an inner surface of the fluid passage to release latent heat and uses the latent heat for heating the face plate. A workpiece fixing device according to claim 5. 7. The workpiece fixing device according to claim 6, wherein the heating medium includes water.