JPH05133701A - Locating jig for roundness measuring apparatus - Google Patents

Abstract

PURPOSE:To enhance the measuring efficiency by allowing a hole-equipped circular work to be located easily, and providing measurability for the roundness of the inside dia. of the work. CONSTITUTION:In the body 42 of a jig capable of placing on a table 32, a hole 42B is provided in the direction perpendicular to the table 32, and a piston 44 is furnished in this hole movably. The top 44A of the piston 44 is formed conically, which makes movement between the position where it is fitted in the bore 50A of a hole-equipped circular disc 50, placed on the measuring surface 42A, to make its location and the position as retreated from this locational position. A plate cam 46 moves the piston 44 between the positions where the disc 50 is located and retreated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a positioning jig for a circularity measuring machine, and more particularly to a circularity of an inner diameter or an outer diameter of a perforated circular workpiece such as a disk, and a concentricity of the inner diameter and the outer diameter. The present invention relates to a positioning jig for a circularity measuring machine used when measuring.

[0002]

2. Description of the Related Art After manufacturing a perforated circular disc made of aluminum or glass, the circularity of the inner and outer diameters of the disc and the concentricity of the inner and outer diameters are inspected. Then, these measurements are performed by a roundness measuring machine.

[0003]

However, the disc is positioned on the table of the roundness measuring machine, and the roundness measuring machine measures the roundness of the inner and outer diameters of the disc and the concentricity of the inner and outer diameters. When measuring, the centering work is required for each product, which causes a problem of poor measurement efficiency. It is also possible to insert a circular positioning jig into the inner circumference of the disk to position the disk. In this case, however, since the circular positioning jig is fitted into the inner circumference of the disk, There is a problem that the roundness cannot be measured.

The present invention has been made in view of such circumstances, and it is possible to easily position a circular workpiece having a hole and measure the roundness of the inner circumference of the disk to improve the measurement efficiency. An object of the present invention is to provide a positioning jig for a roundness measuring machine that can be used.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a positioning jig for use in a circularity measuring machine for measuring the circularity etc. of a perforated circular workpiece. A jig main body having a hole formed in a direction orthogonal to the table and an upper end formed into a conical surface, and the upper end being mounted on the jig main body. A piston member provided in a hole portion of the jig body so as to move between a position for fitting the circular work inner circumference to position the work, and a position where the upper end portion is retracted from the positioning position; And a lifting means for moving the piston member between the work positioning position and the retracted position.

[0006]

According to the present invention, a hole extending in the direction orthogonal to the table is formed in the jig body mountable on the table,
A piston member is movably provided in the hole. The upper end of the piston member is formed into a conical surface, and the upper end of the piston member is inserted into the inner circumference of a circular workpiece that is placed on the jig body to position the workpiece, and the upper end is retracted from the positioning position. Move between positions. Further, the elevating means moves the piston member between the work positioning position and the retracted position.

Therefore, the perforated circular work can be easily positioned, and the roundness of the inner diameter can be measured by abutting the front terminal on the inner circumference of the perforated circular work.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A positioning jig for a roundness measuring machine according to the present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 shows a sectional view of a positioning jig for a roundness measuring machine according to the present invention, in which a table 32 of the roundness measuring machine 30 is provided on a rotating air bearing 34. There is. The table 32 is provided with an X-axis knob and a Y-axis knob (both not shown). The table 32 moves in the X-axis direction when the X-axis knob is operated, and moves in the Y-axis direction when the Y-axis knob is operated. Move to. Further, a detector 36 is provided on the main body of the roundness measuring machine 30 via a pillar (both not shown), and the detector 36 is provided with a front terminal 38.

A jig body 42 of a positioning jig 40 is placed on the table 32. The jig main body 42 is formed in a tubular shape, and the top portion 42A thereof forms a measurement surface parallel to the table 32. The jig body 42 is formed with a hole 42B which is open to the measurement surface 42A and extends in a direction orthogonal to the measurement surface 42A. A piston member 44 is provided in the hole 42B so as to be able to move up and down.
The upper end 44A of 4 is formed in a conical surface shape. Then, the piston member 44 has a positioning position in which the conical upper end portion 44A projects from the measurement surface 42A of the jig body 42,
It moves up and down between the retracted positions that have descended from the positioning position.

A plate cam 46 is rotatably provided via a pin 48 below the piston member 44 in the hole 42B. The lower end of the piston member 44 is in contact with the peripheral surface of the plate cam 46. Therefore, the peripheral surface 46 of the plate cam 46
When A contacts the lower end of the piston member 44, the piston member 44 moves up to the positioning position, and the peripheral surface 4 of the plate cam 46
When 6B comes into contact with the lower end of the piston member 44, the piston member 44 descends to the retracted position.

In FIGS. 1 and 2, reference numeral 50 is a donut-shaped perforated circular disc, and the perforated circular disc 50 has an inner periphery 50A and an outer periphery 50B. Further, reference numeral 52 in FIG. 1 denotes a weight formed in a tubular shape.
The operation of the positioning jig for a roundness measuring machine according to the present invention having such a configuration will be described.

First, the positioning jig 40 is placed on the table 32, and then the X-axis knob and the Y-axis knob are operated on the table 32 so that the center of the jig body 42 coincides with the rotation center of the table 32. .. The center of the jig body 42 is the table 32
Of the measurement surface 42A of the jig body 42 after the center of rotation of
A perforated circular disc 50 is placed in the hole. Then, the plate cam 46 is rotated. As a result, the peripheral surface 46 of the plate cam 46 is
When A is located at the top dead center, the piston member 44 moves up to the positioning position, and the conical upper end 44A of the piston member 44 is fitted into the inner diameter 50A of the perforated circular disc 50. Then, the outer periphery of the conical upper end 44A contacts the inner diameter 50A of the perforated circular disc 50. As a result, the perforated circular disc 50 is positioned at the center of rotation of the table 32.

After the positioning is completed, the perforated circular disc 50 is formed.
A cylindrical weight 52 is placed on the disk, and the perforated circular disk 50 is fixed. Further, the plate cam 46 is rotated to position the peripheral surface 46B of the plate cam 46 at the top dead center. As a result, the piston member 44 descends to the retracted position, so that the conical surface-shaped upper end portion 44A of the piston member 44 is perforated.
Evacuate from the inner diameter 50A of 0.

In this state, the detector 36 is moved to move the front terminal 3
8 perforated circular disc 50 inner periphery 50A or outer periphery 5
The circularity of the inner diameter and the outer diameter of the perforated circular disc 50 and the concentricity of the inner diameter and the outer diameter of the perforated circular disc 50 are measured by contacting with 0B. In the above-described embodiment, the case where the perforated circular disc 50 is measured has been described, but the positioning jig 40 for a roundness measuring machine according to the present invention can be applied to perforated circular workpieces other than the disc type.

Although the plate cam 46 is rotated to move the piston member 44 up and down in the above embodiment, the invention is not limited to this, and other lifting means may be used.

[0016]

As described above, according to the positioning jig for a roundness measuring machine of the present invention, the conical upper end portion of the piston member is located at the work positioning position, that is, the upper end portion is the jig body. The workpiece can be positioned at a position where the workpiece is positioned by being fitted into the perforated circular workpiece that is placed, and at a position where the upper end is retracted from the positioning position.

Thus, the perforated circular work can be easily positioned, and the roundness of the inner diameter can be measured by abutting the front terminal on the inner circumference of the perforated circular work. Therefore, since the centering work can be eliminated for each product when the disc is placed on the table of the roundness measuring machine, the measurement efficiency can be improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a positioning jig for a roundness measuring machine according to the present invention.

FIG. 2 is a perspective view of a perforated circular work that can be measured by a positioning jig for a roundness measuring machine according to the present invention.

[Explanation of symbols]

 30 ... Roundness measuring machine 32 ... Table 40 ... Positioning jig 42 ... Jig body 42A ... Measuring surface 42B ... Hole portion 44 ... Piston member 44A ... Conical surface upper end portion 46 ... Plate cam (elevating means) 50 ... Perforated circular disk 50A ... inner circumference 50B ... outer circumference

Claims (3)

[Claims] 1. A positioning jig used in a roundness measuring machine for measuring the roundness or the like of a perforated circular workpiece, which is placed on a measuring table and formed in a direction orthogonal to the table. A jig body having a portion, an upper end portion formed in a conical surface shape, and a position for fitting the upper end portion into the inner circumference of the perforated circular workpiece placed on the jig body to position the workpiece, And a piston member provided in the hole of the jig body so that the upper end moves between positions retracted from the positioning position, and moving the piston member between the positioning position of the workpiece and the retracted position. A positioning jig for a roundness measuring machine, which comprises a lifting means. 2. The positioning jig for a roundness measuring machine according to claim 1, wherein the elevating means is a cam. 3. A cylindrical weight is arranged on the work to prevent movement of the work.
Positioning jig for roundness measuring machine.