JP2014240102A - Workpiece fixing device of machine tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To firmly fix a workpiece to prevent the workpiece from coming off or rotating by using a fixed side clamp member and a movable side clamp member both having a flat fixing surface even if a surface to be fixed of the workpiece is a complicated shape such as an inclined surface and a curve surface.SOLUTION: A workpiece fixing device of a machine tool which is installed on a table 2 of the machine tool and fastens and fixes a workpiece by a fixed side clamp member 3 and a movable side clamp member 4 both having a flat fixing surface, and applies machining to the workpiece. The device comprises fixing means such as a bolt 5 which fixes the fixed side clamp member 3 to the table 2, an arc-shaped protrusion 10 and an arc-shaped groove 16 on which the arc-shaped protrusion 10 is slidable are provided on a concentric circle using an installed position of the fixing means as a center on a bottom surface of the fixed side clamp member 3 and a top surface of the table 2, and the fixed side clamp member 3 and the table 2 are rotatable using the installed position of the fixing means as a center in the state where the arc-shaped protrusion 10 and the arc-shaped groove 16 are engaged with each other.

Description

  The present invention relates to a workpiece fixing device for a machine tool in which a workpiece is clamped and fixed by a fixed-side clamp member and a movable-side clamp member installed on a table of the machine tool, and machining such as polishing and cutting is performed on the workpiece. .

  2. Description of the Related Art Conventionally, a workpiece fixing device of this type of machine tool generally uses a fixed-side clamp member having a flat fixing surface and a movable-side clamp member to clamp and fix the workpiece. However, the fixed surface of the workpiece to be machined is not only flat but also has a complicated shape such as an inclined surface or a curved surface.

  In that case, the fixed clamping member and the movable clamping member having a flat fixed surface are insufficiently clamped and fixed to the workpiece. In addition, there is a problem that the workpiece is detached or rotated at the time of machining, and machining such as polishing of a horizontal surface is not performed well.

  Therefore, at least one of the fixed-side clamp member and the movable-side clamp member is composed of a fixed member and a movable member that can rotate with respect to the fixed member, and the movable member is rotated according to the shape of the workpiece. The fixed surface of the fixed clamp member and the movable crank member is made into a V shape or T shape in accordance with the shape of the workpiece (for example, refer to Patent Document 1 and Patent Document 2), and the fixed clamp member and the movable crank member. (For example, refer to Patent Document 3) has been proposed.

JP 2006-167903 A (page 3-5, FIG. 4) JP 2007-105825 A (page 4-5, FIG. 4) JP 2010-179421 A (page 4-6, FIG. 1)

  In the workpiece fixing device for a machine tool described above, if the clamp member is divided into two members, that is, a fixed member and a movable member, the structure of the clamp member becomes complicated and the cost increases, and the strength of the clamp member itself may be reduced. was there. In addition, when the shape of the clamp member's fixed surface is matched to the shape of the workpiece, the structure of the clamp member is complicated and the cost is increased, and a plurality of clamp members that match the shape of the workpiece must be prepared and used separately. It was very uneconomical.

  In addition, when fixing a workpiece with a complicated shape, the fixed surface of the fixed clamp member and the fixed surface of the movable clamp member may not be parallel, and the workpiece may be tightened and fixed with the fixed surfaces tilted. is there. If the workpiece is subjected to machining such as grinding or cutting in this state, the clamping force will escape in the direction in which the fixed surfaces are wide open, and the workpiece will also move in that direction. There was a problem that the work would fall out.

  The present invention firmly fixes a work using a fixed-side clamp member and a movable-side clamp member having a flat fixed surface, even if the fixed surface of the work is a complicated shape such as an inclined surface or a curved surface. It aims to be able to prevent slipping off and rotation.

  A workpiece fixing device for a machine tool according to the present invention is installed on a table of a machine tool, and a workpiece is clamped and fixed by a fixed clamp member and a movable clamp member each having a flat fixing surface, and the workpiece is machined. A workpiece fixing device for a machine tool, wherein a fixing means for fixing the fixed-side clamp member to the table, an arc-shaped protrusion on a contact surface between the fixed-side clamp member and the table, The arcuate protrusion is provided in engagement with a freely slidable arcuate groove, and the arcuate protrusion and the arcuate groove are provided on a concentric circle centered on the mounting position of the fixing means. And

  In the workpiece fixing device for a machine tool according to the present invention, of the pair of clamp members, an arc-shaped protrusion or arc-shaped groove provided on the bottom surface of the fixed-side clamp member, an arc-shaped groove or arc-shaped protrusion provided on the table, and Is used to rotate the clamping member on the table. With this structure, the fixed-side clamp member can be fixed to the table in a state where the fixed surface of the fixed-side clamp member is set to be in close contact with the fixed surface of the workpiece.

  For this reason, even if the work surface to be fixed has a complicated shape such as an inclined surface or a curved surface, the work can be firmly tightened and fixed by the fixed side clamp member and the movable side clamp member each having a flat fixed surface. The workpiece can be prevented from coming off or rotating during processing.

  Moreover, in the workpiece fixing device of the machine tool, a protruding piece that protrudes toward the movable clamp member is provided at the end of the fixed surface of the fixed clamp member. With this structure, even if the work surface to be fixed has a more complicated shape, the fixed surface of the clamp member on the fixed side and the protruding piece, which are rotated according to the shape of the work, are brought into contact with the work surface to be fixed. The work can be firmly tightened and fixed while preventing the screw from coming off.

  In addition, since the rotation of the fixed side clamp member is performed centering on the mounting position of the fixing means between the fixed side clamp member and the table, it is easy to set the rotational position of the fixed side clamp member simply by detaching the fixing means. Can be done.

  There is no problem that the strength of the clamp member itself is reduced as compared with the conventional case where the clamp member is divided into two members, a fixed member and a movable member, or the fixed surface of the clamp member is processed into a complicated shape. And while being able to comprise a clamp member cheaply, the existing clamp member can also be improved and used, and it is economical.

  Furthermore, the movable side clamp member has a movable part slidably mounted on the table, and a clamp part attached to the movable part with a bolt. A plurality of bolt mounting holes for changing in accordance with the shape is provided.

  With this structure, even if the workpiece has a more complicated shape, the fixed surface of the fixed-side clamp member rotated according to the shape of the workpiece and the fixing of the movable-side clamp member with the mounting position set according to the shape of the workpiece The workpiece can be tightened and fixed more firmly while bringing the surface and the protruding piece into contact with the fixed surface of the workpiece and preventing the workpiece from coming off.

It is a figure explaining the schematic structure of the workpiece fixing apparatus of the machine tool which concerns on embodiment of this invention. It is a figure explaining the schematic structure of the workpiece fixing apparatus of the machine tool which concerns on embodiment of this invention. It is a figure explaining the schematic structure of the workpiece fixing apparatus of the machine tool which concerns on embodiment of this invention. It is a figure explaining the use condition of the workpiece fixing apparatus of the machine tool which concerns on embodiment of this invention. It is a figure explaining the use condition of the workpiece fixing apparatus of the machine tool which concerns on embodiment of this invention. It is a figure explaining the use condition of the workpiece fixing apparatus of the machine tool which concerns on embodiment of this invention. It is a figure explaining the use condition of the workpiece fixing apparatus of the machine tool which concerns on embodiment of this invention.

  Hereinafter, a work fixing device for a machine tool according to an embodiment of the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a plan view showing a schematic structure of a workpiece fixing device 1 of a machine tool. FIG. 2 is a front view of the work fixing device shown in FIG. FIG. 3 is an exploded perspective view of the workpiece fixing device 1 shown in FIG. FIG. 4 is an explanatory diagram showing a first use state of the work fixing device shown in FIG. FIG. 5 is an explanatory view showing a second use state of the work fixing device shown in FIG. 1. FIG. 6 is an explanatory diagram showing a third usage state of the work fixing device shown in FIG. 1. FIG. 7 is an explanatory view showing a fourth use state of the work fixing device shown in FIG. 1.

  As shown in FIGS. 1 and 2, a workpiece fixing device 1 for a machine tool includes a table 2 that is fixed to a work table of a machine tool (not shown) that performs processing such as polishing and cutting using an electromagnet or the like. Yes. On the table 2, a fixed-side clamp member 3 and a movable-side clamp member 4 for fastening and fixing a work (workpiece) are attached.

  The fixed-side clamp member 3 includes a base portion 3A and a clamp portion 3B integrated with the base portion 3A, and has a rectangular parallelepiped shape as a whole. The clamp portion 3B is provided with a flat fixing surface 3C. The fixed clamp member 3 is fixed to the table 2 by a bolt (fixing means) 5 at the center near the fixed surface 3C.

  The movable-side clamp member 4 includes a movable part 4A slidably installed on the table 2, and a clamp part 4B attached to the movable part 4A by bolts 6 and 7. The clamp part 4B has a flat fixed surface. 4C is provided. The movable side clamp member 4 is moved forward and backward in the X-axis direction on the table 2 by a feed tightening mechanism (not shown). And according to the width | variety of a workpiece | work, the distance of the fixed side clamp member 3 and the movable side clamp member 4 is adjusted, and a workpiece | work is clamped and fixed.

  As shown in FIG. 3, the fixed-side clamp member 3 is provided with an insertion hole 8 through which the bolt 5 is inserted, and an annular protrusion 9 is provided around the insertion hole 8 on the bottom surface. An arc-shaped protrusion 10 is provided with the insertion hole 8 as the center of the arc. The center angle α of the arc is set to 90 degrees.

  Further, at the end of the fixed surface 3 </ b> C of the fixed side clamp member 3, a projecting piece 11 that protrudes toward the movable side clamp member 4 is attached to the end in the rotational direction with bolts 12 and 13. Note that mounting holes (screw holes) for the bolts 12 and 13 are provided on both side surfaces of the clamp portion 3B, and either one of the protruding pieces 11 is attached to both the left and right end portions of the fixed surface 3C. It may be attached to.

  A screw hole 14 into which the bolt 5 is screwed is provided on the upper surface of the table 2, and an annular groove 15 into which the annular protrusion 9 is inserted is provided around the screw hole 14. An arcuate groove 16 having a screw hole 14 as the center of the arc and a size that allows the arcuate protrusion 10 to slide is provided. The central angle β of the arc of the arc-shaped groove 16 is set to 180 degrees.

  The arc-shaped protrusion 10 and the arc-shaped groove 16 are arranged on the mounting position of the bolt 5, that is, on a concentric circle centering on the insertion hole 8 and the screw hole 14, and the arc-shaped protrusion 10 is slidable in the arc-shaped groove 16. Is engaged.

  Therefore, when the fixed-side clamp member 3 is rotated with respect to the table 2 with the bolt 5 removed, the annular protrusion 9 slides in the annular groove 15 and the arc-shaped protrusion 10 moves in the arc-shaped groove 16. Slide on.

  The movable portion 4A of the movable side clamp member 4 is provided with a plurality of screw holes (bolt mounting holes) 17 and 18 for screwing the bolts 6 and 7, and the mounting position of the clamp portion 4B is adjusted to the shape of the workpiece. It can be changed.

  Next, a usage example of the above-described workpiece fixing device 1 will be described with reference to FIGS. FIG. 4 is an example of use for fixing a workpiece W1 having a flat surface to be fixed. In this case, the fixed-side clamp member 3 and the movable-side clamp member 4 are attached to the normal positions, and the workpiece W1 is fastened and fixed in a state of being in close contact with the fixed surfaces 3C and 4C of both the clamp members 3 and 4.

  In this use example, the protruding piece 11 may be brought into contact with the workpiece W1 or may be non-contacted. This is because the shape of the workpiece W1 is a rectangular parallelepiped, and the fixing surfaces 3C and 4C of both the clamp members 3 and 4 are arranged at substantially parallel positions, so that there is no possibility that the workpiece W1 is detached during processing.

  FIG. 5 shows an example of use in which a workpiece W2 whose one side to be fixed is an inclined surface is fixed. In this case, when the fixed-side clamp member 3 is rotated around the insertion hole 8 and the screw hole 14 shown in FIG. 3 with the bolt 5 removed, the annular protrusion 9 shown in FIG. 3 slides in the annular groove 15. At the same time, the arc-shaped protrusion 10 slides in the arc-shaped groove 16.

  At this time, the fixed-side clamp member 3 can rotate 45 degrees from the normal position in the clockwise direction or the counterclockwise direction at the maximum, and is set so that the fixed surface 3C is in close contact with the inclined surface of the workpiece W2. Further, the protruding piece 11 is arranged at the left end (upper side of the paper) of the fixed surface 3C so as to come into contact with the side surface of the workpiece W2 having the longer distance between the fixed surfaces 3C and 4C.

  Then, when the fixed-side clamp member 3 is fixed to the table 2 by the bolt 5 and the movable-side clamp member 4 is moved in the X-axis direction according to the width of the workpiece W2, the workpiece W2 is fixed to the fixing surface 3C of both the clamp members 3 and 4. 4C and the protruding piece 11 are firmly clamped, and are fastened and fixed in a state where they are prevented from coming off.

  In this usage example, the fixed-side clamp member 3 is rotated so that the fixed surface 3C of the fixed-side clamp member 3 and the fixed surface inclined of the workpiece W2 are in surface contact. At this time, the shape of the workpiece W2 makes it easy for the clamping force from both the clamp members 3 and 4 to escape upward in the drawing, but the projection member 1 is the workpiece W2 on the side where the distance between the fixed surfaces 3C and 4C becomes longer. Therefore, even if the fixed surface of the workpiece W2 has an inclined surface, there is no fear that the workpiece W2 is detached or rotated during processing.

  FIG. 6 shows an example of use for fixing a workpiece W3 having a triangular portion on one side of the fixed surface. Also in this case, the fixed-side clamp member 3 is rotated with respect to the table 2 to bring the fixed surface 3C into close contact with a part of the workpiece W3, and the protruding piece 11 is provided in a direction in which the workpiece W3 is easily removed. Support.

  In this usage example, the workpiece W3 is firmly held between the fixing surfaces 3C and 4C of the clamp members 3 and 4 and the projection piece 11, and the surface to be fixed of the workpiece W3 has a complicated shape such as a triangular shape. The work W3 is firmly tightened and fixed, and there is no fear of coming off or rotating during processing.

  FIG. 7 shows an example of use for fixing an arcuate workpiece W4 having a curved surface to be fixed. In this case, the fixed-side clamp member 3 is appropriately rotated with respect to the table 2 to bring the fixed surface 3C into close contact with the fixed surface on one side of the workpiece W4 as much as possible. Further, the protruding piece 11 is provided in a direction in which the workpiece W4 is easily removed, and the protruding piece 11 also supports the workpiece W4. Further, the mounting position of the clamp portion 4B of the movable side clamp member 4 is changed so that the fixed surface 4C of the movable side clamp member 4 is in close contact with the fixed surface on the other side of the workpiece W4 as much as possible.

  In this use example, the arch-shaped workpiece W4 is firmly held between the fixing surfaces 3C and 4C of the clamp members 3 and 4 and the projection piece 11, and even if the fixed surface of the workpiece W4 is curved, W4 is firmly tightened and fixed, so there is no risk of detachment or rotation during processing.

  Thus, in the machine tool leveling apparatus 1 according to the embodiment of the present invention, the arc-shaped protrusion 10 provided on the bottom surface of the fixed-side clamp member 3 and the arc-shaped groove 16 provided on the table 2 are used. Then, the fixed-side clamp member 3 is rotated on the table 2, and the fixed surface 3C of the fixed-side clamp member 3 can be set so as to be as close as possible to the fixed surface of the workpiece.

  For this reason, even if the fixed surface of the work is a complicated shape such as an inclined surface or a curved surface, the work is firmly tightened and fixed using the fixed-side clamp member 3 and the movable-side clamp member 4 having a flat fixed surface. It is possible to prevent the workpiece from being detached or rotated during processing and to perform processing such as polishing of the workpiece surface satisfactorily.

  Further, a projecting piece 11 protruding toward the movable side clamp member 3 is provided at at least one end of the fixed surface 3C of the fixed side clamp member 3 in the rotational direction. And since the workpiece | work is complicated shape, even if the fixing surfaces 3C and 4C of both the clamp members 3 and 4 are not arrange | positioned substantially horizontal, even if it is the protrusion piece 11 in the edge part of the clamp member 3 of the direction where a workpiece | work is easy to remove | deviate. Support the workpiece. As a result, the work is securely clamped between the fixing surfaces 3C and 4C and the protruding piece 11 and tightened to prevent the work from being detached or rotated during processing.

  Further, since the rotation of the fixed-side clamp member 3 is performed around the mounting position of the bolt 5 which is a fixing means between the fixed-side clamp member 3 and the table 2, the fixed-side clamp member 3 can be simply removed from the bolt 5. It is possible to easily set the rotation position.

  Moreover, as compared with the conventional case where the clamp member is divided into two members, a fixed member and a movable member, or the fixed surface of the clamp member is processed into a complicated shape, the strength of the clamp member itself is reduced. In addition, it can be constructed at low cost, and the existing clamp member can be improved and used, which is economical.

  Furthermore, the movable side clamp member 4 has a movable part 4A that is slidably mounted on the table 2, and a clamp part 4B that is attached to the movable part 4A with a bolt 6. The movable part 4A includes A plurality of screw holes 17 and 18 are provided for changing the mounting position of the clamp portion 4B according to the shape of the workpiece. With this structure, even if the workpiece has a more complicated shape, the fixed surface 3C of the fixed-side clamp member 3 rotated according to the workpiece shape and the fixing of the movable-side clamp member 4 whose mounting position is set according to the workpiece shape. The workpiece can be clamped and fixed more firmly while holding the workpiece between the surface 4C and the protruding piece 11 and preventing the workpiece from coming off.

  The machine tool fixing device 1 according to the embodiment of the present invention has been described above. However, the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. is there.

  For example, an annular groove and an arcuate groove may be provided at the bottom of the fixed clamp member, and an annular protrusion and an arcuate protrusion may be provided on the upper surface of the table.

DESCRIPTION OF SYMBOLS 1 ... Work fixing device 2 ... Table 3 ... Fixed side clamp member 3C ... Fixed surface 4 ... Movable side clamp member 4C ... Fixed surface 5 ... Bolt (fixing means)
6, 7 ... Bolt 10 ... Arc-shaped projection 11 ... Projection piece 16 ... Arc-shaped groove 17, 18 ... Screw hole (Bolt mounting hole)
W1-W4 ... Workpiece

Claims (4)

A workpiece fixing device for a machine tool, which is installed on a table of a machine tool and clamps and fixes a workpiece with a fixed clamp member and a movable clamp member each having a flat fixing surface, and performs machining on the workpiece. There,
Fixing means for fixing the fixed-side clamp member to the table;
On the contact surface between the fixed-side clamp member and the table, an arc-shaped protrusion and an arc-shaped groove on which the arc-shaped protrusion can freely slide are provided,
The workpiece fixing device for a machine tool, wherein the arc-shaped protrusion and the arc-shaped groove are provided on a concentric circle centered on a mounting position of the fixing means.   2. The machine tool according to claim 1, wherein the fixed-side clamp member is provided with a protruding piece projecting toward the movable-side clamp member at an end portion of a fixed surface in a rotation direction of the fixed-type clamp member. Work fixing device.   The arcuate protrusion or the arcuate groove is provided on the bottom surface of the fixed clamp member of the contact surface, and the arcuate groove or the arcuate protrusion is provided on the upper surface of the table of the contact surface. The work fixing device for a machine tool according to claim 1, wherein the contact surfaces are engaged with each other.   The movable side clamp member has a movable part slidably mounted on the table and a clamp part attached to the movable part with a bolt, and the movable part has an attachment position of the clamp part. The work fixing device for a machine tool according to any one of claims 1 to 3, further comprising a plurality of bolt mounting holes for changing in accordance with the shape of the work.

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