JP3161128U - Work fixing device - Google Patents

Abstract

A work fixing device capable of firmly holding a work with a simple configuration is provided. An insert member 2 having a first female screw portion 12 is fitted in an inverted T-shaped groove M formed on a workpiece support table T, and the workpiece support table T is interposed between the insert member 2 and the insert member 2. Upper holding member 3, first bolt 4 screwed into first female screw portion 12, holding base portion provided in insertion member 2 and having second female screw portion 18 penetrating in the horizontal direction inside. 5, a second bolt 6 screwed into the second female screw portion 18, and a holding head 7 that press-contacts the work W. In particular, the holding head 7 includes a recess 24 into which the tip portion 22 of the second bolt 6 is inserted, and a contact portion 25 that is formed at a position lower than the tip of the second bolt 6 and contacts the workpiece W. Prepare. [Selection] Figure 3

Description

  The present invention relates to a workpiece fixing device, and more particularly, to a workpiece fixing device that positions and fixes a workpiece, which is a workpiece, on a workpiece support provided in a machine tool such as a cutting machine or a press machine. It is.

  2. Description of the Related Art Conventionally, an apparatus for fixing a workpiece by using an inverted T-shaped groove portion (so-called “T groove”) formed on a workpiece support base of a machine tool is known. For example, as shown in FIG. 5, a T-slot 51 inserted into an inverted T-shaped groove M, a base member 52 disposed on the work support T, and the work support T is sandwiched between the T slots 51. The first bolt 53 that fixes the base member 52 in a state where the base member 52 is fixed, and a clamp head 55 that is formed with a clamp surface that presses one end of the workpiece W at the tip and is attached to the base member 52 via the second bolt 54. An apparatus 50 is known (see Patent Document 1). A first inclined surface 52a is formed on the front surface of the base member 52, and a second inclined surface 55a capable of sliding contact with the first inclined surface 52a is formed on the clamp head 55. According to this, when the second bolt 54 is tightened in a state where the base member 52 is fixed to the workpiece support base T, the clamp head 55 causes the groove portion M while sliding the second inclined surface 55a on the first inclined surface 52a. The workpiece W is immersed and moved in the direction of the workpiece W, and can be brought into contact with the side surface of the workpiece W in a pressurized state, that is, the workpiece W can be positioned and fixed.

  The basic configuration is the same as that of the above-described fixing device 50. However, as shown in FIG. 6, the fixing device 60 in which the clamp head 62 is slidably fitted to the base member 61, specifically, Also known is a dovetail groove (not shown) formed on the clamp head 62 in which an engaging portion (not shown) formed on the base member 61 is fitted in a retaining state. Further, in the fixing device 60, a hole portion 65 penetrating along the sliding direction is formed over the base member 61 and the clamp head 62, and a male screw 66 is embedded in the hole portion 65, and the hole portion A female screw portion 67 that is screwed with the male screw 66 is formed on the base member 61 side of the 65, and the clamp head 62 side of the hole 65 has a shape that restricts the movement of the male screw 66. According to this, by tightening the male screw 66, the clamp head 62 can be lowered in the sliding direction, and the tip of the clamp head 62 can be brought into contact with the side surface of the workpiece W in a pressurized state.

  However, according to these fixing devices 50 and 60, the clamp heads 55 and 62 are moved in the direction of the workpiece W while being slidably contacted by the tightening operation of the second bolt 54 (or the push screw 66) from above. Therefore, it is difficult to press the clamp surfaces of the clamp heads 55 and 62 against the side surface of the workpiece W with a large pressing force. Accordingly, the holding force of the workpiece W cannot be increased. For example, when some external force is applied to the workpiece during processing, the workpiece W may move despite being fixed by the fixing device. In particular, since the clamp heads 55 and 62 are pressed against each other in a direction perpendicular to the side surface of the workpiece W, a downward force cannot be applied to the workpiece W, and there is a concern that the workpiece W may be lifted during processing. It had been.

  In the case shown in FIG. 6, since the female screw portion is not formed on the clamp head 62 side, when the male screw 66 is tightened, the tightening force is concentrated on the female screw portion 67 of the base member 61, and the female screw The part 67 had a problem that it was easily worn out. That is, the base member 61 has to be frequently replaced, which increases the burden on the user. In particular, since the fixing device 60 has a complicated configuration and is expensive, a user's financial burden associated with replacement has been promoted.

  In view of the above, the present invention has an object to provide a work fixing device capable of firmly holding a work with a simple configuration.

The work fixing device according to the present invention is
“A workpiece fixing device that positions and fixes a workpiece placed on a workpiece support base of a processing machine,
An insertion member fitted into an inverted T-shaped groove formed on the workpiece support, and having a first female thread portion;
An upper presser member that has a through-hole that is disposed between the insertion member and sandwiching the work support base in a vertical direction;
A first bolt that is screwed into the first female screw portion of the insertion member through the through hole of the upper pressing member and fixes the upper pressing member in a state where the work support is sandwiched with respect to the insertion member; ,
A holding base portion provided on either the insertion member or the upper pressing member, disposed above the work support base, and having a second female screw portion penetrating in the horizontal direction inside,
A second bolt screwed into the second female thread portion of the holding base portion so that the tip faces the direction of the workpiece;
A bolt-side contact portion disposed between the holding base portion and the workpiece and making point contact with the tip of the second bolt, and formed at a position lower than the tip of the second bolt, A holding head having a point-like or horizontal linear contact portion that presses against the workpiece by tightening two bolts. ''
It is characterized by this.

  Here, the shape of the “insertion member” is not particularly limited, but may be a shape that fits into the groove portion, for example, a block shape having an inverted T-shaped cross section, so as not to rotate when inserted into the groove portion. preferable. Further, the “upper pressing member” may be a block shape or a flat plate shape such as a washer. In addition, the through-hole of the upper pressing member is formed in such a size that the shaft portion of the first bolt penetrates and the head portion does not penetrate.

  According to the present invention, the insertion member is fitted into the inverted T-shaped groove formed on the work support base, and the upper pressing member is disposed above the insertion member so as to sandwich the work support base. In this state, when the first bolt is screwed into the first female thread portion of the insertion member through the through hole of the upper pressing member, the interval between the insertion member and the upper pressing member is gradually reduced, and the upper side of the workpiece support base is increased. The presser member and the insertion member are pressed from above and below. That is, due to the increase in frictional resistance, the upper pressing member and the insertion member are fixed to the work support base.

  On the other hand, either one of the insertion member and the upper holding member is provided with a holding base portion disposed above the work support base, and the holding base portion has a second female screw portion penetrating in the horizontal direction. Is formed. In addition, a holding head is disposed between the holding base portion and the work, and the tip of the second bolt screwed into the second female screw portion makes point contact with the bolt side contact portion of the holding head. Yes. For this reason, when the second bolt is tightened (that is, when it is screwed), the holding head moves to the workpiece side, and the contact portion of the holding head comes into pressure contact with the side surface of the workpiece. Therefore, it is possible to hold the workpiece in a pressurized state. In particular, the abutting portion that abuts on the workpiece is a dot or a horizontal line and is formed at a position below the tip of the second bolt, so that it is retained when the second bolt is further tightened. The head is slightly rotated (inclined) around the contact portion so that the side surface on the holding base side is lifted, and presses the side surface of the work obliquely downward. Further, in this case, since the distance from the tip of the second bolt to the workpiece is shortened, the holding head changes from the horizontal state to the inclined state, so that the holding head is returned to the horizontal state, that is, the workpiece is raised. This makes it possible to reliably prevent the workpiece from lifting up.

  In the work fixing device according to the present invention, “the front end portion of the second bolt is inserted into the side surface of the holding head on the holding base portion side, and the rotation of the holding head with the contact portion as the center is inserted. It is good also as a structure where the recessed part which restrict | limits a moving range is formed.

  According to this, since the tip portion of the second bolt is inserted into the recess, it is easy to align the bolt side contact portion of the holding head with the tip of the second bolt. In addition, since the portion that contacts the tip of the second bolt (that is, the bolt-side contact portion) is provided in the recess, the rotation range of the holding head around the contact portion can be limited, and thus the holding It is possible to hold the head in an inclined state.

  Further, in the work fixing device according to the present invention, “a mounting member provided on the holding base portion and mounting the holding head” may be provided.

  According to this, since the holding head is mounted on the mounting member provided on the holding base portion, the holding head can be brought into contact with the workpiece while maintaining a substantially horizontal state. For this reason, it can contact | abut to the side surface of a workpiece | work in the state in which a contact part is lower than the front-end | tip of a 2nd volt | bolt, and it becomes possible to generate | occur | produce the force which presses a workpiece | work diagonally downward. Moreover, since it is not necessary to support a holding head by hand when tightening a 2nd volt | bolt, workability | operativity can be improved significantly.

  As described above, according to the work fixing device of the present invention, the tightening direction of the second bolt and the press-contact direction with respect to the work substantially coincide with each other, so that a large pressing force can be generated on the side surface of the work. In particular, when the holding head is rotated while being pressed, a downward force can be generated on the side surface of the workpiece, and the workpiece can be firmly held. Further, the structure can be made relatively simple, and damage and wear can be suppressed, and the cost can be reduced.

It is a top view which shows the use condition of the workpiece fixing apparatus of this embodiment. It is a perspective view which shows the structure of a workpiece | work fixing device. It is a longitudinal cross-sectional view which shows the structure of a workpiece | work fixing device. It is explanatory drawing which shows the effect | action of a workpiece | work fixing device. It is sectional drawing which shows the conventional workpiece fixing apparatus. It is sectional drawing which shows the other conventional workpiece fixing apparatus.

  Hereinafter, the workpiece fixing device of the present embodiment will be described with reference to FIGS. 1 to 4. As shown in FIG. 1, the workpiece fixing device 1 of this example positions and fixes a workpiece W, which is a workpiece, on a workpiece support T provided in a processing machine A such as a cutting machine or a press machine. In this example, a pair of workpiece fixing devices 1 are provided for a rectangular parallelepiped workpiece W. That is, the workpiece W is fixed by being sandwiched between a pair of workpiece fixing devices 1 facing each other.

  Note that a plurality of inverted T-shaped groove portions M are arranged in parallel on the workpiece support T, and the workpiece fixing device 1 is fixed to the groove portion M and the workpiece fixing device 1 is set according to the size of the workpiece W. The position of can be changed. In addition, the edge part of the groove part M is opened to the side surface of the processing machine A, and the insertion member 2 (described later) of the workpiece fixing device 1 can be fitted into the groove part M from the opening.

  As shown in FIGS. 2 and 3, the workpiece fixing device 1 includes an insertion member 2 fitted in the groove M of the workpiece support T, and an upper presser disposed above the insertion member 2 so as to sandwich the workpiece support T. The member 3, the first bolt 4 that prevents the insertion member 2 and the upper pressing member 3 from moving with respect to the work support base T, and the holding formed integrally with the insertion member 2 and disposed above the work support base T. A base portion 5, a second bolt 6 penetrating the holding base portion 5, a holding head 7 disposed between the holding base portion 5 and the workpiece W, and attached to the holding base portion 5 to support the holding head 7. The mounting member 8 is provided. In addition, although the material of these members is not specifically limited, In this example, all are formed with metals, such as iron.

  Each member will be described in detail. The insertion member 2 is a block body having an inverted T-shaped longitudinal section, and is composed of a rectangular parallelepiped base portion 10 and an upright portion 11 protruding from the upper surface of the base portion 10. Is formed with a first female screw portion 12 penetrating in the vertical direction. In addition, the horizontal width of the standing part 11 is shorter than the horizontal width of the base part 10, and is set to the dimension substantially the same as the width | variety of the groove part M in planar view (refer FIG. 1). That is, the inner wall of the groove portion M is slidably contacted with the side surface of the standing portion 11 with respect to the insertion member 2 inserted into the groove portion M, thereby preventing the rotation of the insertion member 2. At the same time, the insertion member 2 can be slid along the longitudinal direction of the groove M.

  The upper pressing member 3 is formed of a flat cylindrical block body, and a through hole 14 penetrating in the vertical direction is formed at the center. The through hole 14 is larger than the shaft portion 16 of the first bolt 4 and smaller than the head portion 17 of the first bolt 4. Further, on the upper surface of the upper pressing member 3, a counterbore 15 having a size for accommodating the head 17 of the first bolt 4 is formed. The diameter of the upper presser member 3 is larger than the lateral width of the base portion 10 of the insertion member 2.

  The first bolt 4 is screwed into the first female screw portion 12 of the insertion member 2 through the through-hole 14 of the upper pressing member 3, and the distance between the base portion 10 of the insertion member 2 and the upper pressing member 3 is tightened. The base 10 and the upper pressing member 3 can be pressed against the work support T from above and below. In addition, since the frictional resistance greatly increases in the press-contacted state, the insertion member 2 and the upper pressing member 3 are fixed to the work support base T.

  The holding base portion 5 is formed on the distal end side (the right end portion of the drawing) of the insertion member 2 and protrudes above the workpiece support table T through a groove portion M formed in the workpiece support table T. The holding base portion 5 is formed with a second female screw portion 18 penetrating in the horizontal direction, particularly in a direction perpendicular to the side surface (pressure contact surface) of the workpiece W. The second female screw portion 18 is provided with the second bolt 6. The shaft portion 20 is screwed. The second bolt 6 is disposed with the head portion 21 facing the upper pressing member 3 side and the tip portion 22 facing the workpiece W side, and can be moved to the workpiece W side by a tightening operation. Yes. Further, the tip portion 22 of the second bolt 6 is formed in a spherical shape and can be brought into point contact with the holding head 7.

  The holding head 7 is disposed between the holding base portion 5 and the workpiece W, and is brought into pressure contact with the workpiece W by the tightening operation of the second bolt 6. The side surface of the holding head 7 on the side of the holding base portion 5 is a substantially flat vertical surface, and a concave portion 24 into which the tip portion 22 of the second bolt 6 is inserted is formed at the approximate center. A bolt side contact portion 24 a that makes point contact with the tip portion 22 of the second bolt 6 is formed on the inner surface of the recess 24. In particular, the concave portion 24 is sized so that the tip portion 22 of the second bolt 6 is inserted with play, and the holding head 7 is fixed in a state where the tip portion 22 of the second bolt 6 is inserted. It is possible to rotate (swing) within the range. In addition, the inner surface of the recess 24 is formed in a spherical shape having a larger curvature than the tip portion 22 of the second bolt 6, and is configured such that the spherical surfaces are in point contact. On the other hand, the side surface of the holding head 7 on the workpiece W side is a triangular portion 26, and the tip (that is, a horizontal linear portion) is a contact portion 25 that contacts the workpiece W. In this example, in order to prevent the workpiece W from being damaged, the tip of the triangular portion 26 is formed in an arc shape with a small curvature. Further, the contact portion 25 is formed at a position lower than the tip portion 22 of the second bolt 6 (for example, a position 2 mm lower), and the bolt side contact portion 24a in a state where the contact portion 25 is in contact with the workpiece W. When a horizontal force is applied, the holding head 7 can be rotated so that it slightly lifts around the contact portion 25. Further, the horizontal width of the holding head 7 is about three times the horizontal width of the holding base portion 5, and by increasing the length in the left-right direction of the contact portion 25, the area of the contact portion 25 is increased and held. It is possible to make the head 7 contact in a stable state.

  The mounting member 8 is formed by bending a plate-shaped member. The U-shaped attachment portion 27 is placed on the holding base portion 5 from above, and the lower end of the attachment portion 27 is directed toward the workpiece W. The holding head 7 is placed on the support portion 28. The support portion 28 extends in the horizontal direction. In addition, a through hole 29 penetrating in the front-rear direction is formed in the attachment portion 27 at a position that matches the second female screw portion 18, and the second bolt 6 is inserted through the through hole 29 so that the attachment portion 27 is fixed to the holding base portion 5.

  Next, a method for using the workpiece fixing device 1 will be described. First, the insertion member 2 is inserted into the groove portion M from an end opening (not shown) of the groove portion M opened on both the left and right side surfaces of the processing machine A, and is moved along the groove portion M to the workpiece W side. Here, the holding base portion 5 is integrally formed at the distal end portion of the insertion member 2, and the holding head 7 is supported via the mounting member 8, while the insertion member 2 has a rear end portion. Since the upper pressing member 3 is connected via the first bolt 4, the entire work fixing device 1 moves along the groove M.

  After the contact portion 25 of the holding head 7 is brought into contact with the side surface of the workpiece W, the first bolt 4 screwed into the first female screw portion 12 of the insertion member 2 is tightened. Then, the upper pressing member 3 is fixed in a state where the workpiece support T is sandwiched with respect to the insertion member 2, and the upper pressing member 3 and the insertion member 2 are prevented from moving with respect to the workpiece supporting table T.

  Next, the second bolt 6 screwed into the second female screw portion 18 of the holding base portion 5 is tightened (that is, screwed up). Then, as shown in FIG. 4A, the holding head 7 is pushed by the second bolt 6 and presses against the side surface of the workpiece W. That is, the workpiece W is held in a sandwiched state by pressing the pair of workpiece fixing devices 1 from the left and right sides of the workpiece W. In particular, the tip of the second bolt 6 is inserted in the recess 24 of the holding head 7 with play, and the abutting portion 25 that abuts against the workpiece W is a horizontal line, and the second bolt 6 Since it is formed at a position lower than the tip end portion 22 (the point contact portion), when the second bolt 6 is further tightened, as shown in FIG. The side surface is slightly rotated (inclined) about the contact portion 25 so that the recess 24 is lifted by the amount of play, and a force that presses the side surface of the workpiece W obliquely downward is generated. Furthermore, in this case, the distance L from the tip of the second bolt 6 to the workpiece W is shortened, so that the holding head 7 changes from the horizontal state to the inclined state. It becomes impossible to raise W, and it becomes possible to prevent the workpiece W from lifting up.

  As described above, according to the workpiece fixing device 1 of the present example, the tightening direction of the second bolt 6 and the press-contact direction with respect to the workpiece W substantially coincide with each other, so that a large pressing force can be generated on the side surface of the workpiece W. it can. In particular, when the holding head 7 is rotated while being pressed, a downward force can be generated on the side surface of the workpiece W, and the workpiece W can be firmly held. Moreover, since the holding head 7 and the second bolt 6 are not connected to each other, a relatively simple structure can be obtained, and damage and wear can be suppressed.

  Further, since the tip portion 22 of the second bolt 6 is inserted into the recess 24, it is easy to align the bolt side contact portion 24a of the holding head 7 with the tip portion 22 of the second bolt 6. Further, since the bolt side contact portion 24a that contacts the tip portion 22 of the second bolt 6 is provided in the recess 24, the rotation range of the holding head 7 around the horizontal linear contact portion 25 is limited. As a result, the holding head 7 can be held in an inclined state.

  Furthermore, according to the workpiece fixing device 1 of the present example, the holding head 7 is placed on the placement member 8 attached to the holding base portion 5, so that the contact portion 25 is the tip of the second bolt 6. It can be brought into contact with the side surface of the workpiece W in a state lower than the portion 22, and a force for pressing the workpiece W obliquely downward can be surely generated. Further, when the second bolt 6 is tightened, the holding head 7 does not have to be supported by hand, so that workability can be greatly improved.

  The present invention has been described with reference to preferred embodiments. However, the present invention is not limited to these embodiments, and various improvements can be made without departing from the spirit of the present invention, as described below. And design changes are possible.

  That is, in the above embodiment, the holding base portion 5 is formed integrally with the insertion member 2, but the holding base portion 5 may be formed integrally with the upper pressing member 3. Further, the holding base portion 5 may be configured as a separate member and assembled to the insertion member 2 or the upper pressing member 3.

  In the above embodiment, the tip portion 22 of the second bolt 6 and the inner surface of the recess 24 are both formed into a spherical shape, but the tip portion 22 of the second bolt 6 and the bolt side contact portion 24a of the recess 24 are shown. As long as they are configured so as to be in point contact with each other, each shape is not particularly limited. For example, the tip portion 22 of the second bolt 6 may be formed in a conical shape. Moreover, you may form the recessed part 24 with the circular hole whose cross-sectional shape is constant. Furthermore, the front end portion 22 of the second bolt 6 may be a flat surface, and the bolt side contact portion 24a that contacts it may be formed by a spherical or arcuate protrusion.

  Moreover, in the said embodiment, although what hold | maintained the holding head 7 to the side surface of the workpiece | work W orthogonal to the groove part M was shown, the 2nd internal thread part 18 of the holding base part 5 is set to the direction orthogonal to the groove part M. The holding head 7 may be press-contacted to the side surface of the workpiece W that is formed and parallel to the groove M.

  Moreover, in the said embodiment, although what comprised the 2nd volt | bolt 6 and the holding head 7 so that separation | separation was mutually possible was shown, for example, as shown to the dashed-two dotted line of Fig.4 (a), the axial part of the 2nd volt | bolt 6 is shown. It is also possible to provide a retaining plate 30 that is engaged with 20 so as to be movable by one pitch, and this retaining plate 30 may be attached to the holding head 7 via a screw 31. According to this, the tip portion 22 of the second bolt 6 is prevented from coming off from the concave portion 24 of the holding head 7, and the workpiece fixing device 1 can be handled as one unit. Therefore, the operation of disposing the holding head 7 on the distal end side of the second bolt 6 every time it is used becomes unnecessary, and loss of the holding head 7 can be suppressed.

  Furthermore, in the said embodiment, although what showed a pair of workpiece fixing apparatus 1 press-contacting the left and right side surfaces of the workpiece | work W, ie, the thing which clamps the workpiece | work W, one side of the workpiece | work W was fixed to the wall etc. The workpiece fixing device 1 may be pressed against only the other side surface. Further, the workpiece fixing device 1 may be arranged in the vicinity of the four corners of the workpiece W.

DESCRIPTION OF SYMBOLS 1 Work fixing device 2 Insertion member 3 Upper pressing member 4 First bolt 5 Holding base part 6 Second bolt 7 Holding head 8 Mounting member 12 First female screw part 14 Through hole 18 Second female screw part 22 Tip part 24 Recessed part 24a Bolt side contact portion 25 Contact portion A Processing machine M Groove portion T Work support W Work

Japanese Patent Laid-Open No. 9-262730

Claims (3)

A workpiece fixing device for positioning and fixing a workpiece placed on a workpiece support base of a processing machine,
An insertion member fitted into an inverted T-shaped groove formed on the workpiece support, and having a first female thread portion;
An upper presser member that has a through-hole that is disposed between the insertion member and sandwiching the work support base in a vertical direction;
A first bolt that is screwed into the first female screw portion of the insertion member through the through hole of the upper pressing member and fixes the upper pressing member in a state where the work support is sandwiched with respect to the insertion member; ,
A holding base portion provided on either the insertion member or the upper pressing member, disposed above the work support base, and having a second female screw portion penetrating in the horizontal direction inside,
A second bolt screwed into the second female thread portion of the holding base portion so that the tip faces the direction of the workpiece;
A bolt-side contact portion disposed between the holding base portion and the workpiece and making point contact with the tip of the second bolt, and formed at a position lower than the tip of the second bolt, A work fixing device comprising: a holding head having a point-like or horizontal linear contact portion that presses against the work by tightening two bolts. On the side surface of the holding head on the holding base portion side, a tip portion of the second bolt is inserted, and a recess for limiting a rotation range of the holding head around the contact portion is formed. The work fixing device according to claim 1, wherein The work fixing device according to claim 1, further comprising a mounting member that is provided on the holding base portion and mounts the holding head.

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