JPH09126701A - Circular arc radial dimension measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a circular arc radial dimension measuring device which can be used to determine the guilty of a circular arc machined part of a processed sheet metal object as to whether the part for example, corresponds precisely to the design drawing or not. SOLUTION: The circular arc radial dimension measuring device is provided with scale rods 111-113 consisting of three thin long plate members, and is each of the scale rods 111-113, measurement reference holes 121, 122,... are formed at fixed intervals. The three scale rods 111-113 are spread so as to form a fan shape, and measurement reference faces 13 at the tips of the respective scale rods 111-113 are brought into contact with the predetermined circular arc of a design drawing, and then, a screw shaft is inserted into the predetermined reference holes so as to fasten the scale rods 111-113, and consequently, the scale rods 111-113 are integrated together. In this condition, the measuring device is matched with the predetermined circular arc part in a machined object, and if the circular arc of the machined object corresponds to the circular arc in the design drawing while the measurement reference faces of the scale rods 111-113 are brought into uniform contact with the predetermined circular arc part of the machined object, the machined object is acknowledged as a good item.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diameter dimension of an arc used for determining whether or not the arc shape of an arc portion of a sheet metal part or the like manufactured based on a design drawing matches the design drawing. Regarding measuring device.

[0002]

2. Description of the Related Art When a part is made of sheet metal or the like and an arc-shaped shaping part is present in this part, it is inspected whether or not the shape of the arc surface conforms to the design drawing. There is a need to. When inspecting the arc size of such a sheet metal part or the like, for example, a curved ruler is used to compare the design drawing and the arc-shaped part of the sheet metal part to determine the quality. Here, when measuring a dimension that does not exist in a ruler there, a circular arc is copied onto a cardboard or the like using a compass based on a design drawing, and the circular arc dimension is inspected and measured corresponding to a part.

However, when measuring a diameter dimension using a curve ruler as described above, a large number of kinds of curve rulers are required because it is necessary to deal with a larger number of objects to be measured. The capacity of the container or the like for storing the product becomes large. Further, it takes a lot of time to search for a required ruler, prepare thick paper, and transfer dimensions, so that the inspection and measurement of the arc dimension cannot be efficiently performed.

As a measuring device for such a diameter, a measuring device as disclosed in, for example, Japanese Utility Model Laid-Open No. 60-72506 is known. This measuring instrument is provided with, for example, three extendable and retractable compasses and a scale needle, which are configured to rotate about a stop as a fulcrum. A magnet provided at the tip of the scale needle is The compass length is measured while being in contact with the curved portion of the metal workpiece. However, this complicates the configuration of the measuring instrument, and is not intended to judge the quality of the sheet metal workpiece by, for example, determining the comparison between the design drawing and the sheet metal workpiece, and such a It cannot be easily applied to the purpose.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and in particular, in a design drawing and a curved portion of a molded part made of a sheet metal or the like, the comparison between the two can be easily and efficiently performed. It is an object of the present invention to provide an apparatus for measuring the diameter of a circular arc which can be performed and can be configured sufficiently easily.

[0006]

A circular arc diameter measuring device according to the present invention forms a plurality of reference holes at equal intervals on each of at least three scale rods, and at least these three reference holes are formed.
The scale rods of the book are integrated using the selected reference holes, and the reference measurement surface at the tip of each of these scale rods is composed of a surface that can contact the arc surface of the measurement target. Opens in a fan shape around the integrated portion so that the reference measurement surface comes into contact with the arc surface of the measurement target.

That is, at least three scale rods are opened with the integrated portion as a fulcrum so that the respective tip ends of these scale rods are brought into contact with the arcuate surface of the sheet metal working portion, and the contacted state. The measuring device of (1) is made to correspond to, for example, the corresponding curved portion of the design drawing, and the quality of the workpiece can be judged from the matching state.

Therefore, this measuring device can be constructed very easily, and in particular, the curved surface of the workpiece can be very easily compared with the design drawing.
For example, it can be used efficiently at a sheet metal working site. Here, plural kinds of such measuring devices are prepared so as to correspond to the size of the circular arc of the measurement object, and particularly when the shape of the reference measurement surface at the tip of the scale rod is a circular arc, the diameter of this circular arc is set to be large or small. As a result, it is possible to efficiently deal with various measurement targets.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a state at the time of measurement, and in this embodiment, three scale rods 111 to 113 are provided. Each of the scale rods 111 to 113 is made of, for example, an elongated plate material, and a large number of reference holes 121, 122, ... Are formed side by side in the longitudinal direction at regular intervals. In this case, the distance between the reference holes 121, 122, ... Is set to about 5 mm.
The measurement reference plane 13 at the tip of each of 111 to 113 is formed in a circular arc so that it can be brought into point contact with the circular arc surface to be measured.

Three scale rods 111 constructed in this way
2 to 113, select one reference hole each as shown in FIG. 2 and connect with a stopper 14 composed of a screw shaft, and a nut 15
And fasten them together to fix them together. In this case, for example, the measurement reference plane of each of the scale bars 111 to 113 is limited within the limited range of the circular surface of the design drawing to be measured.
Scale bar 111 so that 13 contacts the arc surface.
.About.113 are appropriately expanded in a fan shape, and in that state, predetermined reference hole positions are aligned and fastened and fixed by a nut 15.

That is, when using the diameter dimension measuring apparatus constructed as described above, the nut 15 is removed so that the scale rods 111 to 113 can be separated. For example, the scale rods 111 to 113 can be attached to a predetermined arc portion of the design drawing. 113 tip reference plane
Make sure the 13 are in the corresponding position and stop as described above.
14 is inserted into a predetermined reference hole, and a nut 15 is fastened and integrally fixed. In this state, the state of the arc of the predetermined portion of the design drawing is copied to this measuring device.

After that, the integrated and fixed measuring device is used to determine whether or not the reference surfaces of the scale rods 111 to 113 are in good contact with a predetermined arc portion of the sheet metal-worked workpiece. If it is determined that the reference surfaces 13 of all the scale rods 111 to 113 are evenly in contact with the predetermined arc processed portion of the measured object,
This DUT is certified to have been processed correctly as per the design drawing. Of course, the reference planes 13 of the three scale rods 111 to 113 may be aligned with the part to be measured, and this may be aligned with the design drawing.

Here, when the diameters of the circular arcs of the design drawing and the object to be measured are the same, the measurement reference planes 13 of the scale bars 111 to 113 come into contact with the respective predetermined circular arc portions. Judged as “non-defective”. On the other hand, for example, in the scale rods 111 to 113 set so that the reference plane 13 is in contact with the predetermined arc portion of the design drawing, only the reference planes of two scale bars are in contact with the arc surface of the object to be measured. Then, it is determined that the measured object is not processed according to the design drawing.

Here, it is possible to measure the distance between the fixed position and the measurement reference plane by counting the position of the reference hole through which the screw shaft 14 is inserted, but in reality, the diameter of the arc to be measured or Three scale bars depending on the shape
Since the relationship between the effective length of 111 113 and the fan-shaped spread angle is selected and there is a contrast between the processed part and the design drawing, the length between the fixed part by the screw shaft 14 and the reference measurement surface is especially measured and controlled. do not have to. If necessary, the positions of the reference holes used may be counted.

In the embodiment, the scale bar is composed of three pieces, but if this is three or more, a larger number of scale bars may be combined. By doing so, even more complicated shapes such as continuous arcs can be measured, the design drawing can be compared with the workpiece, and the quality of the workpiece can be determined. Further, in the embodiment, the measurement reference surface 13 at the tip of each scale rod 111 to 113 is shown to be formed as an arc surface, but if the diameter of the arc to be measured is small, this It is desirable that the diameter of the circular arc shape of the measurement reference surface is small.

The shape of the measurement reference surface 13 is not limited to a circular arc, but can be configured by an acute angle portion or an obtuse angle portion. In short, each of the scale bars 111 to 113 can be measured with respect to the object to be measured. It is necessary that the tip reference surface be shaped so that it can make point contact. If a plurality of sets of measuring devices having different measurement reference planes 13 at the tip are prepared, they can be efficiently used in an actual measurement site.

Further, the fixing means for a plurality of scale rods composed of at least three pieces is not limited to the example shown in the embodiment, and for example, a pin with a flange may be used. The scale rod itself is not limited to a thin plate-like member, and any design change can be made as long as the scale rod is configured in a normal rod state and can also serve as the reference hole for the fixing means.

[Brief description of the drawings]

FIG. 1 is a configuration diagram viewed from a plane for explaining an arc diameter dimension measuring device according to an embodiment of the present invention.

FIG. 2 is a side view of the measuring device.

[Explanation of symbols]

111 to 113 ... Scale rods, 121, 122, ... Reference holes, 13 ...
Measurement reference plane, 14 ... screw shaft, 15 ... nut.

Claims (3)

[Claims] 1. At least three scale rods each having a plurality of reference holes formed at equal intervals, and at least three scale rods inserted into the respective selected reference holes of the at least three scale rods. Fixing means for integrating the two scale rods, wherein the reference measurement surface at the tip of the scale rod is a surface that can come into point contact with the arc surface of the measurement target, and the at least three scale rods are provided. Is an arc diameter dimension measuring device, wherein the reference measurement surface is brought into contact with the arc surface of the object to be measured by opening in a fan shape around the portion fixed by the fixing means. 2. A diameter measuring device for an arc according to claim 1, wherein the reference measuring surfaces at the tips of the at least three scale rods are formed by arcs. 3. The apparatus for measuring the diameter of a circular arc according to claim 1, wherein the reference measurement surface at each tip of each of the at least three scale rods has an acute or obtuse angular shape.