JP2750054B2 - Jig for fixing work to machine tool - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining center, NC
The present invention relates to a jig for fixing a work to a machine tool such as a milling machine and an NC grinding machine. More specifically, the present invention relates to a jig suitable for fixing a plate-shaped work.

[0002]

2. Description of the Related Art Conventionally, as a fixing jig for fixing a plate-shaped rectangular work on a table of a machine tool, a base plate having a plurality of T-shaped grooves formed on a surface thereof in a vertical direction and a horizontal direction is provided through a table. A positioning block mounted on the base plate and having a reference surface parallel to the side edge on one side edge of the base plate, and a base plate surface and a reference surface of the positioning block on another side edge of the base plate adjacent to the side edge. A movable block that has a reference plane perpendicular to the workpiece and that can be moved according to the size of the work is mounted. Further, the work is positioned on the base plate by a clamp slidably mounted along the T-shaped groove. There is known a fixing jig configured to be pressed against a reference surface of a block and fixed.

However, in the fixing jig, the T-shaped groove is formed in the vertical and horizontal directions of the base plate. Therefore, when fixing a workpiece having a trapezoidal, triangular or circular shape or a combination thereof, the T-shaped groove is formed. In some cases, the angle between the direction of the groove and the outer surface of the work is nearly parallel, and in this case, the force by which the clamp presses the work to the reference surface is dispersed,
There was a problem that the work could not be fixed securely.

In order to solve this problem, a block having substantially the same thickness as a work is mounted on a base plate in the vicinity of a trapezoidal, triangular, circular, or a combination of the works placed on the surface of the base plate. The flat bar is placed between the work and the block, and the tip of the bolt whose head is slidably inserted into the T-shaped groove passes through the center of the flat bar, and furthermore, the bolt that has passed through the flat bar A method is known in which a work is pressed against a base plate and fixed by tightening a nut screwed to the tip.

[0005]

However, in the above-mentioned fixing method, a positioning jig is required for each work having a different outer shape in order to keep the processing origin of the work fixed on the base plate constant. Was troublesome. In addition, every time the work to be machined is changed, the positioning jig must be replaced to measure the work origin of the work, and there is a problem that the setup work time accompanying the change of the work to be machined is increased.

SUMMARY OF THE INVENTION It is an object of the present invention to ensure that a work can be reliably fixed without increasing the number of parts of a fixing jig even if the number of works having different outer shapes increases, and that a setup operation performed for processing another work having a different outer shape. An object of the present invention is to provide a jig for fixing a work to a machine tool, which can easily perform the work in a short time and can improve the processing accuracy of the work.

[0007]

The structure of the present invention for achieving the above object will be described with reference to FIGS. 1, 5 and 6 corresponding to the embodiment. The present invention relates to a base plate 17 formed in a rectangular shape and having a plurality of T-shaped grooves 17a to 17g on a surface thereof, and a first positioning block 21 mounted along one side edge of the base plate 17 and having a first reference surface 31.
A second positioning block 22 having a second reference surface 32 attached along a side edge adjacent to one side edge of the base plate 17 and forming a predetermined angle with the first reference surface 31, and T-shaped grooves 17a to 17g Base plate 1 slidable along
7, a plurality of clamps 4 for fixing the workpieces 11 to 13 by pressing the outer peripheral surfaces of the workpieces 11 to 13 against one or both of the first reference plane 31 and the second reference plane 32.
A jig for fixing a work to a machine tool having a first reference surface 31 and a plurality of T-shaped grooves 17a to 17g.
And a tip surface 4 formed radially around a point P on the surface of the base plate 17 near the intersection of the second reference surface 32 and the plurality of clamps 41 and 52 and abutting on the workpieces 11 to 13.
One or more tip surfaces 44d of 4d and 54d are formed to be convex.

[0008]

When the work 11 is fixed to the machine tool by the fixing jig 14, the clamps 41 and 52 are selectively attached to the base plate 17 along the T-shaped grooves 17a to 17g, and then the work 11 is placed on the first reference surface. 31 and second reference plane 32
The tip surfaces 44d and 54d of the clamps 41 and 52 are brought into contact with the outer peripheral surface of the work 11 while being held in contact with
The outer peripheral surface of the work 11 is pressed against one or both of the first reference surface 31 and the second reference surface 32 by the clamps 41 and 52. At this time, the T-shaped grooves 17a to 17g are formed radially and the tip surfaces 44d, 54 of the clamps 41, 52 are formed.
Since d is formed as a convex surface, the force of the clamps 41 and 52 pressing the work 11 against the first reference surface 31 or the second reference surface 32 is not dispersed, and the work 11 is securely fixed. In addition, the setup work performed for processing another work 12, 13 having a different outer shape is performed by clamping the clamps 41, 52 to the work 12, 1.
3, it is only necessary to selectively attach the base plate 17 along the T-shaped grooves 17a to 17g.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; The machine tool is a horizontal machining center (not shown) in this example, and the workpieces 11 to 13 machined by this machining center are three types of plate-like ones as shown in FIGS. 1, 5 and 6 in this example. It is. A fixing jig 14 for fixing the works 11 to 13 is mounted on the table of the machining center as shown in FIG. The fixing jig 14 includes a scale 16, a base plate 17 having a plurality of T-shaped grooves 17 a to 17 g on the surface, a first positioning block 21 attached along one side edge of the base plate 17, in this example, a lower edge, A second positioning block 22 attached along a side edge adjacent to a lower edge of the base plate 17. Ikele 16 is the base 1
6a and a receiving member 16b erected on a base 16a. A rectangular base plate 17 is mounted on one surface of the receiving member 16b via a plate mounting block 18. The work 11 shown in FIG. 1 has a crank-shaped outer shape, and the work 12 shown in FIG. 5 has an internal gear 12a formed in the center.
Is formed in a substantially L-shape.

The first positioning block 21 is fixed to the surface of the plate mounting block 18 by bolts 23 and knock pins 24 so as to be in close contact with the lower surface of the base plate 17, and the second positioning block 22 is in close contact with the side surface adjacent to the lower surface of the base plate 17. To the side of the plate mounting block 18 with bolts 26 and knock pins 27. The first positioning block 21 has a first reference surface 3 extending horizontally in parallel with the lower surface of the base plate 17.
1 is formed, and a second reference surface 32 is formed on the second positioning block 22 so as to extend in the vertical direction in parallel with the side surface of the base plate 17. Further, a third reference surface 33 parallel to the base plate 17 is formed on each of the first positioning block 21 and the second positioning block 22. The first reference plane 31, the second reference plane 32, and the third reference plane 33 are orthogonal to each other, and the reference planes 31 to 33 form an orthogonal coordinate system (FIGS. 4 and 7).

The first reference plane 31, the second reference plane 32, and the third
The reference surface 33 is a thick plate reference surface 31a, 31b, 31c formed by stepping the first positioning block 21 and the second positioning block 22 at a predetermined distance from the surface of the base plate 17, and the thickness thereof. Thin plate reference surfaces 31b, 32b, 33b formed by stepping at a predetermined distance further away from base plate 17 than plate reference surfaces 31a, 32a, 33a.
And The thick plate reference surfaces 31a, 32a, and 33a are used for fixing a relatively thick work, and the thin plate reference surfaces 31b, 32b, and 33b are used for fixing a small work. 4 and FIG. 7). Also, the reference planes 31a, 32a, 33a for the thick plate and the reference plane 31 for the thin plate
b, 32b, and 33b are stored in a memory (not shown) of the controller. Since the workpieces 11 to 13 shown in FIGS. 1, 5 and 6 have a relatively large thickness, they are fixed to the thick plate reference surfaces 31a, 32a and 33a. The plurality of T-shaped grooves 17 a to 17 g of the base plate 17 are formed radially around a point P on the surface of the base plate 17 near the intersection of the first reference surface 31 and the second reference surface 32. In this example, seven T-shaped grooves 17a to 17g are formed at intervals of 15 degrees around a point P on the base plate 17 (FIGS. 1 and 5 to 7).

The base plate 17 has T-shaped grooves 17a-
Two types of clamps 41 and 52 slidable along 17g
Is selectively attached. The clamp 41 includes a clamp body 43 having a lower portion slidably inserted into the T-shaped grooves 17a to 17g and having an inclined surface 43a substantially at the center of the upper portion.
The clamp piece 44 has an inclined surface 44a slidably in contact with the inclined surface 43a, and a flat bar 45 loosely inserted into the wide portion at the bottom of the T-shaped grooves 17a to 17g (FIGS. 2 and 3). . The clamp body 43 has a base end surface 43b slightly lower than the front end surfaces of the first positioning block 21 and the second positioning block 22 with the lower part inserted in the T-shaped grooves 17a to 17g, and a thickness of the third reference surface 33. A work placement surface 43c having the same height from the surface of the base plate 17 as the plate reference surface 33a is formed. An inclined surface 43a is formed between the base end surface 43b and the work mounting surface 43c, and the bottom surface of the clamp piece 44 is spaced from the work mounting surface 43c so that the inclined surface 44a of the clamp piece 44 is
3 is brought into contact with the inclined surface 43a (FIGS. 2 and 3).

The clamp body 43 has two through holes 43d,
43e are formed and these through holes 4 of the flat bar 45 are formed.
The two screw holes 45a,
45b is formed. Also, the through hole 43 of the clamp body 43
A counterbore 43f is formed on the base end face 43b side of d.
A long hole 44b extending in the longitudinal direction of the clamp body 43 and a counterbore 43f extending in the longitudinal direction of the long hole 44b are formed in the clamp piece 44. A bolt 46 is inserted into a through hole 43 d of the clamp body 43, and the bolt 46 is screwed into a screw hole 45 a of the flat bar 45. Elongated hole 44b of clamp piece 44 and through hole 43d of clamp body 43
A bolt 47 is inserted into the flat bar 45, and the bolt 47 is screwed into a screw hole 45b of the flat bar 45. Bolts 46, 4
7 is immersed in the counterbore holes 43f and 44c, respectively (FIGS. 2 and 3). A compression coil spring 48 positioned between the clamp piece 44 and the clamp body 43 and wound around the bolt 47 urges the bottom surface of the clamp piece 44 in a direction separating from the work mounting surface 43c of the clamp body 43. Work 1 of clamp piece 44 when bolt 47 is tightened
The tips that contact the outer peripheral surfaces of 1 to 13 are guided by the inclined surface 43a of the clamp body 43, move the workpieces 11 to 13 in the direction of pressing the first and second reference surfaces 31, 32, and loosen the bolt 47. And the clamp piece 44 are the compression coil spring 4
8 and moves in a direction away from the outer peripheral surfaces of the works 11 to 13 along the inclined surface 43a of the clamp body 43 (FIGS. 2 and 3). Work 11-1
The tip end surface 44d of the clamp piece 44 abutting on the outer peripheral surface of the workpiece 3 is formed as a curved convex surface.
At least a line contact is made with the outer peripheral surfaces of the first to thirteenth surfaces (FIGS. 1, 5 and 6). Also, knurls are provided on the distal end surface 44d of the clamp piece 44 in order to increase frictional resistance with the outer peripheral surfaces of the works 11 to 13. The clamp 52 is formed in the same shape as the clamp 41 except that the distal end face 54 d of the clamp piece 54 is flat.
7 by bolts 56 and 57 (FIGS. 1 and 5).
And FIG. 6).

A method of using a jig for fixing a workpiece to a machine tool having the above-described configuration will be described. Work 1 shown in FIG.
1 is fixed on a table (not shown) of a machining center by a fixing jig 14, first, the T-shaped groove 17 is fixed.
The clamp 41 is attached along e, and the two clamps 52 are attached along a T-shaped groove 17a parallel to the first reference surface 31 and a T-shaped groove 17g parallel to the second reference surface 32, respectively. Next, the clamps 41, 52, and 5 are held in a state where the workpiece 11 is held in contact with the thick plate reference surface 31a of the first reference surface 31 and the thick plate reference surface 32a of the second reference surface 32.
2 are moved along the T-shaped grooves 17e, 17a, 17g, respectively, so that the tip surfaces of the clamp pieces 44, 54, 54 abut on the outer peripheral surface of the work 11. In this state, bolt 46,
After tightening the clamp bodies 43, 53, 53 to the base plate 17 by tightening the
The clamp pieces 44,
The tips of 54, 54 are pressed against the outer peripheral surface of the work 11. As a result, the clamp 41 presses the work 11 against the first reference plane 31 and the second reference plane 32 without dispersing the pressing force, and the clamp 52 presses the work 11 against the first reference plane 31 or the second reference plane 32, respectively. Since the pressing is performed, the work 11 is securely fixed. After the planing and drilling of the work 11 are completed, the work 1 is merely loosened by loosening the bolts 47, 57, 57.
1 can be removed.

When the processing of the work 11 shown in FIG. 1 is completed and the work 12 shown in FIG. 5 is fixed to the machining center by the fixing jig 14, the clamps 52 and 5 are used.
2 from the base plate 17 and clamp 41
It only needs to be attached along the groove 17c. Further, the processing of the work 12 shown in FIG. 5 is completed, and the work 13 shown in FIG.
Is fixed to the machining center by the fixing jig 14, it is only necessary to mount two clamps 52, 52 in addition to the clamps 41, 41 along the T-shaped grooves 17a, 17g. In this way, the setup work for processing the different workpieces 12 and 13 having different outer shapes can be easily performed in a short time.

In the above embodiment, the base plate is formed in a rectangular shape. However, this is merely an example. If the base plate is rectangular, it may be formed in a parallelogram or a rhombus. In this case, the table of the machining center moves based on the oblique coordinate system instead of the rectangular coordinate system. In the above embodiment, the horizontal machining center is used as the machine tool. However, the machine tool is not limited to this, and may be a vertical machining center, an NC milling machine, an NC grinder, or another machine tool.

[0017]

As described above, according to the present invention, a plurality of T-shaped grooves formed on the surface of the base plate are formed in the first plate.
It is formed radially around a point on the base plate surface near the intersection of the first reference plane of the positioning block and the second reference plane of the second positioning block, and is slidably attached to the base plate along the T-shaped groove. In addition, one or more of the tip surfaces abutting the workpieces of a plurality of clamps are formed to be convex, so even if the number of workpieces with different external shapes increases, the number of parts of the fixing jig must be increased without fail. Work can be fixed. In addition, since there is no need to newly measure a processing origin in a setup operation performed for processing another workpiece having a different outer shape, the setup operation can be easily performed in a short time. Further, since the machining origin is always constant even when the outer shape of the work changes, the machining accuracy of the work can be improved.

[Brief description of the drawings]

FIG. 1 is a view seen from an arrow A in FIG. 7 showing a state in which a work is fixed by a jig for fixing the work to a machine tool according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG. 1;

FIG. 3 is a sectional view taken along line CC of FIG. 2;

FIG. 4 is a sectional view taken along line DD of FIG. 1;

FIG. 5 is a view corresponding to FIG. 1 and showing a state in which a work having another outer shape is fixed by the fixing jig.

FIG. 6 is a view corresponding to FIG. 1 and showing a state in which a work having another outer shape is fixed by the fixing jig.

FIG. 7 is a perspective view of a fixing jig excluding a clamp.

[Explanation of symbols]

 11 to 13 Work 14 Fixing jig 17 Base plate 17a to 17g T-shaped groove 21 First positioning block 22 Second positioning block 31 First reference surface 32 Second reference surface 41, 52 Clamp 44d, 54d Tip surface P Base plate surface Point of

Claims (1)

(57) [Claims] 1. A plurality of T-shaped grooves (1) formed in a square shape on the surface.
7a to 17g), a first positioning block (21) attached along one side edge of the base plate (17) and having a first reference surface (31), and a base plate (17). A second positioning block (22) mounted along a side edge adjacent to one side edge and having a second reference surface (32) forming a predetermined angle with the first reference surface (31); and the T-shaped groove. (17a to 17g) slidably attached to the base plate (17) and attached to the outer peripheral surface of the work (11 to 13) with one of the first reference surface (31) or the second reference surface (32). A jig for fixing a work to a machine tool having a plurality of clamps (41, 52) for fixing the work (11 to 13) by pressing against one or both of the plurality of T-shaped grooves (17a 17g) is the base plate (17) near the intersection of the first reference surface (31) and the second reference surface (32).
One or two or more of the tip surfaces (44d, 54d) of the plurality of clamps (41, 52), which are formed radially around a point (P) on the surface and abut against the workpiece (11-13) of the plurality of clamps (41, 52) A jig for fixing a workpiece to a machine tool, wherein a tip surface (44d) of the workpiece is formed to be convex.