JP4576357B2 - Work lifting tool - Google Patents

Description

  The present invention relates to a raising jig used to position and fix a workpiece on a table of a machine tool such as a machining center.

  Many machining centers have a rotatable table. By moving the table, the workable surface of the work is set to two or more, and the work is processed by a replaceable cutting tool. When the workpiece is directly fixed on such a table, the workpiece is hit by the headstock when the table of the machine tool is largely rotated, as shown in FIG. From 90 degrees to 90 degrees occurs. Therefore, as a countermeasure, a raising jig has been used to create an appropriate distance between the table and the workpiece as shown in FIG. 7b.

  In Patent Document 1, when changing the size and shape of a workpiece to be processed, in order to employ a suitable size and shape raising jig according to the workpiece, various sizes and shapes of the workpiece are employed. A method for manufacturing a lifting jig by welding is described.

JP 2000-61754 A

  However, with the raising jig of Patent Document 1, when changing the size and shape of the workpiece to be processed, a new jig is required each time and the cost is increased.

  Therefore, the inventor divides and forms the raising jig into a work holding part and a base part, and the raising jig can cope with a workpiece of various sizes and shapes by replacing only the work holding part. I tried to solve the above problems.

  However, the raising jig to which the workpiece holding part can be attached and detached has lower rigidity than the raising jig integrally formed by cutting or welding.

  Therefore, an object of the present invention is to provide a raising jig in which the work holding portion can be exchanged for workpieces of various sizes and shapes and the rigidity after attachment is increased.

  In order to solve the above problems, a workpiece raising jig according to the present invention is a raising jig for raising a position of a workpiece on a table of a machine tool, and the raising jig is attached to a table. The base part is attached to the upper surface, and at least the upper part is formed into a cylindrical part, and the base part has a lower surface that is larger than the upper surface of the base part, and is divided into a work holding part that holds the work on the upper surface side. The work holding part is positioned on the upper surface and detachably attached, and a male screw is formed on the outer peripheral surface of the upper part of the base part, a nut is screwed onto the male screw, and the work holding part is secured with the nut. It is characterized in that it can be tightened from the lower surface side.

  Although it does not specifically limit with a cutting tool, A drill, a tap, an end mill, a face mill etc. can be illustrated.

  The outer diameter of the nut is not particularly limited, but is preferably 140% to 175% of the outer diameter of the columnar portion of the base portion.

  According to the workpiece raising jig of the present invention, the workpiece holder can be exchanged for workpieces of various sizes and shapes, and the rigidity after attachment can be increased.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the raising jig 1 is attached to the upper surface of the table 13, and at least the upper portion has a base portion 30 formed on the cylindrical portion 31, and a lower surface larger than the upper surface of the base portion 30. The workpiece holding unit 20 is divided into a workpiece holding unit 20 that holds the workpiece 51 on the side, and the workpiece holding unit 20 is positioned on the upper surface of the base unit 30 and is detachably attached. 33, the nut 40 is screwed onto the male screw 33, and the work holding portion 20 is tightened from the lower surface side with the nut 40. The lower surface of the pedestal 30 is fixed to the table 13 of the machine tool 10, and a mechanism capable of holding the work 51 is provided on the upper surface of the work holding unit 20.

  As shown in FIGS. 5 and 6, the machine tool 10 to which the workpiece raising jig of this embodiment is attached is, for example, a vertical machining center, and includes a head stock 11 having a cutting tool 12 and a rotatable table 13. It is also equipped with. In the present embodiment, the head stock 11 holds the cutting tool 12 downward in the vertical direction, and the cutting tool is movable in the vertical direction and in the horizontal direction. As shown in FIG. 5, the axis of the table 13 orthogonal to the cutting tool 12 is used as the base of rotation, and the time when the table 13 faces a horizontal surface with respect to the cutting tool 12 is defined as 0 degree, as shown in FIG. As can be seen, if the table 13 includes the cutting tool 12 in the plane of 90 degrees, the table 13 rotates 90 degrees or more from the 0 degree position.

  Next, based on FIG. 1, FIG. 2, the structure of the raising jig | tool 1 in an Example is demonstrated. The raising jig 1 of this embodiment is attached to the upper surface of the table 13, has at least an upper portion formed with a column portion 30 and a lower surface larger than the upper surface of the table portion, and holds the workpiece 51 on the upper surface side. The work holding part 20 is divided and formed, and the work holding part 20 is positioned on the upper surface of the pedestal 30 and is detachably attached. A nut 40 is screwed onto the screw 33 so that the workpiece holding unit 20 can be tightened with the nut 40. Further, the lower surface of the base portion 30 is fixed to the table 13 of the machine tool, and a mechanism capable of holding the workpiece 51 is provided on the upper surface of the workpiece holding portion 20. Hereinafter, each component of the raising jig will be described in detail.

  The workpiece holding unit 20 is obtained by processing a square metal plate, for example. A circular hole 24 is provided at the center, and a through hole 21 is formed so as to surround the circular hole 24 so as to be fixed to the base portion 30 with a screw 27. Further, a screw hole 22 of a holding screw 53 for attaching a holding member 52 of the workpiece 51 is formed on the upper surface of the workpiece holding unit 20. In the vicinity of the circular hole 24, a screw screw port 23 penetrating the work holding part 20 is formed, and a screw screw 28 is screwed. Positioning pins 25 are embedded in the lower surface of the work holding unit 20 and protrude below the lower surface of the work holding unit 20. A circular concave portion 26 is formed at the center of the lower surface, and the convex portion 36 can be fitted from below. Further, the portion excluding the recess 26 on the lower surface is flat because it contacts the nut 40. In addition, in this embodiment, the four corners of the square are dropped, and consideration is given to safety in the work. Note that a plurality of workpieces having a required size and shape are formed and prepared in advance so that the workpiece holder 20 can be exchanged according to the change of the workpiece 51.

  The base portion 30 is formed, for example, in a shape in which a cylindrical portion 31 is erected on one side of the flange portion by integral cutting or welding, and a male screw 33 is formed on the outer peripheral surface of the upper portion of the cylindrical portion 31, and on the upper surface. A convex portion 36 that fits into the concave portion 26 of the work holding portion 20 is formed. Further, a screw hole 34 corresponding to the drill hole 21 of the work holding part 20 and a positioning pin insertion hole 35 are formed so as to surround the convex part 36. Further, a bolt hole 32 penetrating the flange portion is formed in the flange portion so as to surround the periphery of the column portion 31. In this embodiment, the outer diameter of the cylindrical portion is 100 mm, but is not particularly limited.

  The nut 40 has an annular shape and has an internal thread 41 cut on the entire inner peripheral surface. A latching groove 42 is formed on the outer peripheral surface at a position that divides the outer periphery into four equal parts. Further, the upper surface is a flat surface in contact with the lower surface of the work holding unit 20. In this embodiment, the outer diameter of the nut is 150 mm, which is 150% of the outer diameter of the columnar portion 31 of the base portion.

  Next, the actual usage will be described based on FIG. 3 and FIG. 4 using the components described above.

(1) First, in order to attach the raising jig, as shown in FIG. 3A, the nut 40 is screwed onto the base part 30 so that the upper part of the base part 30 is slightly visible. Then, the work holding part 20 is fitted to the base part 30 and both are attached by screws 27. At this time, the platform 30 may be fixed to the table 13 first. The method is such that a bolt 37 which is not shown in the figure and is hooked in a groove 14 (not shown) is passed through a bolt hole 32 of the base 30 and is tightened with a nut 38.

  Subsequently, as shown in FIG. 3 b, the nut 40 is tightened so as to press against the workpiece holding unit 20 located above. Thereby, the contact area of the upper surface of the base part 30 and the lower surface of the workpiece | work holding | maintenance part 20 will be increased substantially, and the rigidity after attachment can be improved. When tightening the nut 40, a wrench or the like (not shown) is hung on the retaining groove 42.

  Then, as shown in FIGS. 4 c and 2 b, the work 51 is pressed onto the upper surface of the work holding part 20 by a pressing member 52 and is stopped by a pressing screw 53 from above. At this time, when the base part 30 is not yet fixed to the table 13, it fixes by the method mentioned above.

(2) When the raising jig 1 is attached by the above-described method and the workpiece 51 is actually processed, the raising of the workpiece 51 is sufficiently raised by the raising jig 1, so that the table 13 and the headstock 11 Interference can be reduced, and the pivotable angle of the table 13 can be increased. Further, by changing and reducing the area of the work holding unit 20 according to the size and shape of the work 51, interference between the work holding unit 20 and the headstock 11 can be reduced.

(3) Next, the case where the workpiece holding part 20 is removed from the base part 30 will be described. First, the holding screw 53 and the holding member 52 are removed, and the work 51 is removed from the work holding unit 20. The screw 27 that connects the work holding unit 20 and the base unit 30 is removed. Then, a screw screw 28 is screwed into a screw screw port 23 formed in the work holding unit 20, and the tip of the screw screw 28 penetrating the work holding unit 20 presses the upper surface of the base part 30 to separate them. . At this time, even if it is difficult to separate the work holding part 20 and the base part 30 only by the extraction screw 28, as shown in FIG. 4d, it is easy to tighten the nut 40 upward and push the work holding part 20 upward. Can be separated.

  In addition, this invention is not limited to the said Example, In the range which does not deviate from the meaning of invention, it can change suitably and can be actualized.

It is a disassembled perspective view which shows the raising jig | tool of the Example of this invention. (A) is a perspective view which shows the workpiece holding part of the same raising jig | tool seen from the downward direction. (B) is a perspective view which shows the workpiece holding part which hold | maintained the workpiece | work on the upper surface. (A) is the front view which showed the method of attaching a workpiece | work holding part to a base part. (B) is the front view which showed the method of improving the rigidity after attaching a base part and a workpiece holding part. (c) is a front view which shows the actual use state which hold | maintained the workpiece | work on the workpiece holding board. (D) is a front view which shows the method of removing a base part and a workpiece holding part. It is a front view which shows the raising jig | tool attached to the table (rotation angle 0 degree) of a machine tool. It is a front view which shows the raising jig | tool attached to the table (rotation angle 90 degree | times) of a machine tool. It is a side view which shows the prior art example of a raising jig | tool.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lifting jig 10 Machine tool 13 Table 20 Work holding | maintenance part 30 Base part 31 Cylindrical part 33 Male screw 40 Nut 51 Workpiece

Claims (1)

A raising jig for raising the position of a workpiece on a table of a machine tool,
The raising jig is attached to the upper surface of the table, and at least an upper part is a cylindrical part, and a work holding part that has a lower surface larger than the upper surface of the base part and holds the work on the upper surface side. Divided into
While positioning the work holding part on the upper surface of the base part and detachably attaching it,
A workpiece raising jig in which a male screw is formed on the outer peripheral surface of the upper portion of the base portion, a nut is screwed onto the male screw, and the workpiece holding portion can be tightened from the lower surface side with the nut.

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