JPH08112771A - Clamp structure using vice and clamp assist member used in this clamp structure - Google Patents

Abstract

PURPOSE: To clamp even a thin workpiece prevented from springing to the outside in an accurately positioning condition, by interposing a clamp assist member between an opposed surface of each opposed plate and a clamped end face of the workpiece. CONSTITUTION: The first curved surface part 71 of a clamp assist member 7 is brought into external contact with a clamped end face of a workpiece W, and the second curved surface part 72 is brought into external contact with a side of an opposed surface 51 of an opposed plate 5. Here by providing a contact part (tangent P part) of the second curved surface part 72 in a point end side of the opposed surface 51 from a contact part (tangent Q part) of the first curved surface part 71, the clamp assist member 7 receives turn force in a direction of void arrow mark with a prescribed rotational center serving as the center, to generate a condition that the first curved surface part 71 is pressed into an opposite side to a point end side of the opposed surface 51. Accordingly, frictional force, generated between the first curved surface part 71 and the clamped end face of the workpiece W, holds the workpiece W while pressed in a direction (lower side) separating distant from the point end side of the opposed surface 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sandwiching structure using a vise and a sandwiching assisting member used in this sandwiching structure.

[0002]

2. Description of the Related Art Generally, a vise has a pair of facing surfaces for holding a work piece, which is located closer to the tip than a portion receiving a driving force. In such a vise, when gripping a work, the tip ends of the facing surfaces tend to open so as to widen the mutual distance. In particular,
This tendency is strong when the work is thin.

For this reason, the work may jump out from the tip of the facing surface, or may tilt. In this case, even if a work, such as a plastic molding die, which is desired to be accurately positioned is grasped, it cannot be accurately positioned, which is a problem. The present invention has been made in order to solve the above problems, and it is possible to prevent even a thin work piece from protruding to the outside and hold the work piece in a correctly positioned state. An object of the present invention is to provide a sandwiching assisting member used in this sandwiching structure.

[0004]

Means and Actions for Solving the Problems In order to achieve the above-mentioned object, a sandwiching structure using a vise according to a first aspect of the present invention is a vise having a pair of facing plates arranged to face each other so as to be separable from each other. In a sandwiching structure using a vise for sandwiching a work between a pair of opposed surfaces by relatively bringing the pair of opposed plates into close proximity, a sandwiching assisting member is provided between each opposed surface and a sandwiched end surface of the workpiece. This sandwiching assisting member has a first curved surface portion circumscribing the sandwiched end surface of the workpiece and a contact surface of the facing surface of the first curved surface portion that is in contact with the sandwiched end surface of the workpiece. It is characterized by having a second curved surface portion circumscribing the facing surface so that a contact portion exists on the tip end side.

According to the above structure, when the pair of opposing plates are brought close to each other with the sandwiching assisting member along the opposing surface,
The first curved surface portion of the clamping assisting member can circumscribe the end surface of the workpiece to be clamped, and the second curved surface portion can contact the opposing surface to clamp the workpiece. At this time, since the contact portion where the second curved surface portion contacts the facing surface is closer to the tip end side of the facing surface than the contact portion where the first curved surface portion contacts the sandwiched end surface of the work, the sandwiching assist member is As a result, a rotational force is received about a predetermined rotation center, and as a result, the first curved surface portion is pushed into the opposite side of the facing surface. Therefore, the work is held while being pushed in a direction away from the tip end side of the facing surface by the frictional force generated between the first curved surface portion and the held end surface.

Particularly, since the first and second curved surface portions are in line contact at the portions in contact with the work and the facing surface, respectively, when the work is clamped, the space between the pair of facing surfaces expands. Will not be affected by this. In order to achieve the above object, a sandwiching structure using a vise according to claim 2 is the sandwiching structure using the vise according to claim 1, wherein the center of curvature of the first curved surface portion and the curvature of the second curved surface portion are the same. The center is characterized by being separated by a predetermined distance in the contact and separation direction of the facing plate.

According to the above configuration, the same operation as that of the invention according to claim 1 is achieved. In addition, the first curved surface portion clamps the work piece while projecting to the side of the clamped work piece. Accordingly, even when a work having a small width is sandwiched, the distance between the facing surfaces can be increased. As a result, even when using a support table on which the work is placed when holding the work, the width of the support table can be wide and the work can be stably placed.

In order to achieve the above object, a sandwiching structure using a vise according to claim 3 is the sandwiching structure using a vise according to claim 1 or 2, wherein the pair of opposing surfaces have the second A groove extending in a predetermined direction having an inclined surface with which the curved surface portion is in contact is formed, and the inclination direction of the inclined surface is such that the inclined surface comes into contact with the inclined surface when both opposing plates are brought close to each other. It is characterized in that it is set so that the contact portion of the second curved surface portion can be pushed away from the tip end side of the facing surface.

According to the above construction, the above-mentioned claim 1 or 2 is provided.
The same effect as that of the invention according to the first aspect is exhibited. In addition, due to the inclined surface, the contact portion of the second curved surface portion that is in contact with the inclined surface receives a force in a direction away from the tip side of the facing surface. As a result, the sandwiching assisting member is further pushed into the opposite side of the facing surface from the tip side, whereby
The work is held while being further pushed in a direction away from the tip side of the facing surface.

In order to achieve the above object, a sandwiching structure using a vise according to a fourth aspect is the sandwiching structure using a vise according to the third aspect, in which a sandwiching assistance member is provided between each of the facing plates. A pair of holding plates are interposed, and the surfaces of the holding plates facing each other form the pair of facing surfaces. According to the above configuration, since the pair of sandwiching plates whose opposing surfaces form the opposing surfaces are interposed between the opposing plate and the sandwiching assisting member, it is the same as the invention according to claim 1 or 2 above. In addition to the above effect, a general vise can be used as the vise.

In order to achieve the above object, the sandwiching assisting member according to claim 5 is a sandwiching assisting member used in a sandwiching structure using a vise according to any one of claims 1 to 4, which has a long length. And a pair of curved surface portions each having a curvature center axis extending along the longitudinal direction are formed on the outer peripheral surface of the rod body.
It is characterized in that they are separated by a predetermined distance in a predetermined direction.

According to the above structure, the holding assisting member is used in the holding structure using the vise according to any one of the above-mentioned first to fourth aspects.
The same operation as the invention according to any one of the above is exerted.

[0013]

Embodiments will be described in detail below with reference to the accompanying drawings showing embodiments. FIG. 2 is a schematic side view of a sandwiching structure using a vise as an embodiment of the present invention, and FIG. 1 is an enlarged view of a main part thereof. Each drawing shows a state where a work is clamped by using a vise. In the following, left and right refer to left and right in the figure, and upper and lower refer to upper and lower in the figure.

Referring to FIG. 2, the vise A is supported by a fixed portion 2 fixed to a base 1 and a fixed portion 2 so as to be relatively movable in the left-right direction by a guide mechanism (not shown). It has a movable part 3 and a trapezoidal screw 4 which generates a driving force for moving the movable part 3. In this embodiment,
The work W is sandwiched by the pair of opposed plates 5 and 6 which are fixed to the fixed portion 2 and the movable portion 3, respectively.
Is sandwiched. The work W is supported by a support S.

The fixed part 2 and the movable part 3 respectively fix the pair of opposed plates 5 and 6 for sandwiching the work W. The fixed part 2 and the movable part 3 are made of cast metal or steel, and the pair of facing plates 5 and 6 are made of steel. On the facing surfaces 51 and 61 of the pair of facing plates 5 and 6, substantially V-shaped groove portions 52 and 62 extending in the front-rear direction (direction orthogonal to the paper surface) in the drawing are formed. This groove 5
A plurality of 2, 62 can be formed in the vertical direction. The inner surface of the groove portion 52 has an upper-side inclined surface 52a located at a higher position.
And a lower side inclined surface 52b located in the lower side (see FIG. 1). Similarly, the inner surface of the groove portion 62 is also composed of an upper-side inclined surface located above and a lower-side inclined surface located below (not shown).

The inclination angle of the upper inclined surface 52a with respect to the facing surface 51 is shallower than the inclination angle of the lower inclined surface 52a with respect to the opposed surface 51. Similarly, the inclination angle of the upper side inclined surface with respect to the facing surface 61 formed in the groove portion 62 is shallower than the inclination angle of the lower side inclined surface with respect to the facing surface 61. The sandwiching assisting member 7 is a rod-shaped member having a substantially wedge-shaped cross section, and can be composed of, for example, a piano wire. The sandwiching assistance member 7 will be described with reference to FIG. The work W is sandwiched by the sandwiching assisting members 7 on both sides thereof.
Then, only one of the sandwiching assisting members 7 is illustrated to simplify the description.

The sandwiching assisting member 7 includes a first curved surface portion 71,
It has the 2nd curved surface part 72. The pair of curved surface portions 71, 72 each have a curvature center axis extending along the longitudinal direction of the sandwiching assistance member 7, and both curvature centers are separated from each other by a predetermined distance in a predetermined direction. More specifically, the first curved surface portion 71 includes a curved surface having a radius r1 whose center of curvature is the reference numeral C1 and is circumscribed at the tangent line Q with the held end surface Wa of the work W. In addition, the second curved surface portion 72 includes a curved surface having a radius r2 with the reference numeral C2 as the center of curvature, and is circumscribed at the tangent line P with the upper inclined surface 52a.

Further, the center of curvature C1 is separated from the center of curvature C2 by a predetermined distance, and is located closer to the workpiece W than the center of curvature C2. Further, the center of curvature C2 is
It is located closer to the tip end of the facing surface 51 than the center of curvature C1. As is clear from FIG. 1, in the state where the work W is clamped, the contact portion of the second curved surface portion 72 (tangent line P portion) is more than the contact portion of the first curved surface portion 71 (tangent line Q portion).
Exists on the tip side of the facing surface 51.

When the work W is held by the vise A, first, the work W is placed on the support S with the space between the pair of facing surfaces 51 and 61 sufficiently widened, and this state is set. Then, the sandwiching assisting member 7 is interposed between the groove portions 52 and 62 and both sides of the work W to drive the trapezoidal screw 4. Then, the holding assisting member 7 is brought into contact with the held end surface Wa of the work W, and the trapezoidal screw 4 is further tightened to hold the work W.

With reference to FIGS. 1 and 2, according to the present embodiment, the first curved surface portion 71 of the sandwiching assisting member 7 is on the sandwiched end surface Wa of the work W, and the second curved surface portion 72 is on the other hand. It is circumscribed on the opposing surfaces 51 and 61. At this time, the first curved surface portion 7
Since the contact portion (the tangent P portion) of the second curved surface portion 72 is closer to the tip end side of the facing surface 51 than the contact portion 1 (the tangent Q portion), the sandwiching assisting member 7 is rotated by a predetermined amount. With the center as the center, rotational force is applied in the direction of the white arrow in FIG. 1, and the first curved surface portion 71 is pushed into the side opposite to the tip side of the facing surface 51. Therefore, the work W is held while being pushed in the direction away from the tip side of the facing surface 51 (lower side in the figure) by the frictional force generated between the first curved surface portion 71 and the sandwiched end surface Wa of the work W. To be done.

Therefore, even if the tip ends of the pair of facing surfaces 51 and 61 are expanded, the work W is prevented from jumping out to the tip end side and the work W is held in an accurately positioned state. You can Further, since the center of curvature C2 is located closer to the tip end side of the facing surface 51 than the center of curvature C1, even when the thickness B of the work W is thin, the first curved surface portion 71 is formed to have the thickness of the work W. It is possible to surely follow the work W according to. This allows
Even if the thickness B of the work W is thin, it can be reliably held.

Further, since the center of curvature C1 is located on the side of the work W with respect to the center of curvature C2 by a predetermined distance, the first curved surface portion 71 can hold the work W in a state of projecting to the side of the work W. it can. Accordingly, even when the work W having a small width is held, the distance between the facing surfaces 51 and 61 can be increased. As a result, the support base S
The width L can be wide, and the work W can be stably placed. The support base S is not always necessary, but since the work W can be raised when the work W is clamped, there is an advantage that the work W can be easily processed.

In particular, the first and second curved surface portions 71, 72
However, the portion in contact with the work W and the facing surfaces 51 and 61 is
Since they are in line contact with each other, the pair of opposing surfaces 51, 6
Even if the tip of No. 1 is widened, there is an advantage that it is not affected by this influence. Moreover, in the present embodiment, the second curved surface portion 72 contacts the upper side inclined surface 52a provided on the facing surfaces 51 and 61. With this inclined surface 52a, the contact portion of the second curved surface portion 72 in contact with the inclined surface 52a (tangent line P
Part) receives the force F1 in the direction away from the tip side of the facing surface 51 (downward in FIG. 1). as a result,
The sandwiching assisting member 7 is pushed further downward, and thus the work is held while being pushed further downward. As a result, the work W can be more effectively prevented from jumping out and can be held in a more accurately positioned state.

When the direction of the force F1 passes through the contact portion (the tangent line Q portion) of the first curved surface portion 71, the turning force is not generated, but the force F1 is directly held. It works so as to push in the assisting member 7 and can hold the work. FIG. 3 shows another embodiment of the present invention. Referring to the figure, this embodiment is different from the above-mentioned one embodiment in that, in the above-mentioned one embodiment, the groove portions 52 and 62 are formed in the facing surfaces 51 and 61 themselves. The sandwiching plates 8 and 9 are respectively interposed between the workpieces 5 and 6 and the work W, and the groove portions 52 and 62 are formed on the sandwiching surfaces 81 and 91 of the sandwiching plates 8 and 9, respectively. That is,
The sandwiching surfaces 81, 91 correspond to the facing surfaces 51, 61 in the one embodiment. Since the other structure is the same as that of the above-described embodiment, the same reference numerals as those in FIG. 1 are attached to FIG. 3, and the description thereof is omitted.

At the upper ends of the sandwiching plates 8 and 9, the facing plate 5 is provided.
Flange portions 8a and 9a that can be placed on the upper portion of 6 are formed, and the holding plates 8 and 9 can be easily attached and detached by the flange portions 8a and 9a. Also in this embodiment, the same operational effects as the embodiment of FIG. 1 are obtained. In addition, as the vise A, a commercially available vise can be used, and the main holding structure can be configured only by preparing the holding plates 8 and 9 having a simple structure.
The cost can be reduced.

The present invention is not limited to the above-mentioned embodiment, but the groove portions 52,
It can also be used for a vise in which 62 is not formed. Further, various design changes can be made without changing the gist of the present invention. For example, the sandwiching assistance member 7
As such, design changes as shown in FIGS. 4 and 5 can be made.

FIG. 4 shows a modification of the sandwiching assisting member 7, which has a so-called boomerang-shaped cross section. Further, in the modification shown in FIG. 5, the cross section is formed into a substantially spoon shape. A first curved surface portion 71 and a second curved surface portion 72 are formed on both of the sandwich assisting members 7.
The first curved surface portion 71 and the second curved surface portion 72 have a predetermined curvature radius r centered on predetermined curvature centers C1 and C2.
The curved surface portion 7a having the is formed. Other configurations are the same as those of the sandwiching assisting member 7 shown in the above-mentioned embodiment.

[0028]

According to the invention of claim 1, the work can be held while being pushed by interposing the sandwiching assisting member. Therefore, even if the pair of facing surfaces of the vise are expanded, It is possible to prevent the work from popping out and hold the work in a correctly positioned state. In particular,
By the first curved surface portion of the sandwiching assisting member, the sandwiched end surface of the work is sandwiched by the line contact by the sandwiching assisting member, so that even if the pair of opposing surfaces expands, this is not affected, and more accurate. The work can be held in the state of being positioned.

Since the contact portion where the first curved surface portion contacts the work is located closer to the tip side of the opposing surface than the contact portion where the second curved surface portion contacts the opposing surface, Even when the thickness is thin, the first curved surface portion can be reliably aligned with the work according to the thickness of the work,
Even if the work is thin, it can be reliably held. Therefore, even a work having a small width and a small thickness can be held in a state of being accurately positioned.

Further, it becomes possible to perform processing with good positional accuracy on the work, and it can be applied to sandwiching a plastic molding die or the like which requires precision processing. According to the invention of claim 2, the same effect as that of the invention of claim 1 can be obtained. In addition, since the work is clamped in a state where the first curved surface portion projects to the work side, the distance between the facing surfaces can be set large even when the work having a small width is clamped. The width of the supporting base can be wide. As a result, even a work having a small width and a small thickness can be held in a stable and accurately positioned state.

According to the invention of claim 3, the same effect as that of the invention of claim 1 or 2 can be obtained. in addition,
By the inclined surface, the work is held while being pushed further in the direction away from the tip side of the facing surface, so that the work can be held in a more accurately positioned state. According to the invention of claim 4, the same effect as that of the invention of claim 3 can be obtained. In addition, since a general vise is used as the vise and only the holding plate is attached, the manufacturing cost of the vise can be reduced.

According to the invention of claim 5, by using the sandwiching assisting member, the above-mentioned claim 1 to 4
The same effect as the invention according to any one of the above can be obtained.

[Brief description of drawings]

FIG. 1 is a schematic side view of a holding structure using a vise according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the holding structure shown in FIG.

FIG. 3 is a schematic side view of a holding structure using a vise according to another embodiment of the present invention.

FIG. 4 is a cross-sectional view showing a modified example of the sandwiching assistance member.

FIG. 5 is a cross-sectional view showing another modified example of the sandwiching assistance member.

[Explanation of symbols]

 A Vise W Workpiece C1 Center of curvature C2 Center of curvature r1 Radius of curvature r2 Radius of curvature P Tangent line (contact portion) Q Tangent line (contact portion) 5 Opposing plate 51 Opposing surface 52 Groove portion 52a Upper-side inclined surface (sloping surface) 6 Opposing plate 61 Opposing plate Surface 62 Groove 7 Holding aid member 71 First curved surface portion 72 Second curved surface portion 8 Holding plate 9 Holding plate 81 Holding surface (opposing surface) 91 Holding surface (opposing surface)

Claims (5)

[Claims] 1. A vise having a pair of facing plates arranged to face each other so as to be able to come into contact with and separate from each other, the vise holding a work between the pair of facing faces by bringing the pair of facing plates relatively close to each other. In the sandwiching structure using, a sandwiching assisting member is interposed between each opposing surface and the sandwiched end face of the work, and the sandwiching assisting member includes a first curved surface portion circumscribing the sandwiched end face of the workpiece. A second curved surface portion circumscribing the facing surface such that the first curved surface portion has a contact portion closer to the tip end side of the facing surface than the contact portion contacting the held end surface of the workpiece. A holding structure using a vise that is characterized by being 2. A sandwiching structure using a vise according to claim 1, wherein a center of curvature of the first curved surface portion and a center of curvature of the second curved surface portion are separated from each other by a predetermined distance in a contacting / separating direction of the facing plate. A sandwiching structure using a vise that is characterized by being. 3. A sandwiching structure using a vise according to claim 1 or 2, wherein a groove portion extending in a predetermined direction having an inclined surface in contact with the second curved surface portion is formed on the pair of opposing surfaces. The inclination direction of the inclined surface is as follows when both opposing plates are brought close to each other.
A vice is used in which the inclined surface is set so as to be able to push the contact portion of the second curved surface portion in contact with the inclined surface in a direction away from the tip end side of the facing surface. Holding structure. 4. A sandwiching structure using a vise according to claim 3, wherein a pair of sandwiching plates are interposed between each of the opposing plates and the sandwiching assisting member, and the sandwiching plates face each other. However, a sandwiching structure using a vise, characterized in that the pair of opposing surfaces is formed. 5. A sandwiching assisting member used in a sandwiching structure using the vise according to claim 1, comprising a long rod body, and an outer peripheral surface of the rod body. A sandwiching assisting member, wherein a pair of curved surface portions each having a curvature center axis extending along the longitudinal direction are formed, and both curvature center axes are separated from each other by a predetermined distance in a predetermined direction.