JPH04102003U - Earl gauge - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a radius gauge that can easily measure the radius of curvature of an arcuate surface of an object to be measured. [Structure] This is a radius gauge 10 that measures the radius of curvature of an arcuate surface formed on an object to be measured, and a plurality of gauges each having the same radius of curvature and different arc lengths are installed on the outer periphery of the flat gauge body 12. Gauge parts 21 to 26 are formed in a concave arc shape.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea is a radius gauge that measures the radius of curvature of an arcuate surface formed on an object to be measured. Regarding.

0002

[Conventional technology]

Conventionally, objects to be measured such as master models, pressed products, and press dies were chamfered in an arc shape. When measuring the radius of curvature of a corner, etc., a radius gauge 50 as shown in FIG. 4 is usually used. is used. This R gauge 50 has a gauge main body 52 in the shape of a flat plate. A concave arc-shaped game having a radius of curvature R' and an arc length L' centering on the point O' is attached to the end. One zigzag portion 54 is provided. Then, the gauge part 54 is connected to the corner of the object M to be measured. Measure the radius of curvature Rm of the circular arc surface Ma formed in the section. was common. At that time, the curve of the arcuate surface Ma centered on the point Om of the object to be measured M The radius of curvature Rm and the arc length Lm, and the radius of curvature R' and the arc length of the gauge portion 54 If L' are the same value, the gauge part 54 will be placed on the arc surface Ma of the object to be measured M without any gap. The radius of curvature Rm of the circular arc surface Ma of the object to be measured M is accurately measured.

0003

[Problem that the idea aims to solve]

However, as shown in FIG. 4, the radius of curvature Rm of the arcuate surface Ma of the object M Even if the radius of curvature R' of the arc section 54 is the same value, the radius of curvature When the arc length L' of the gauge section 54 is longer, the side edges 56, 56 of the gauge section 54 are longer. straddles the arcuate surface Ma of the object to be measured M and is continuous to both side edges of the arcuate surface Ma of the object to be measured M. It comes into contact with the plane Mb. Therefore, the arcuate surface Ma of the object to be measured M and the A gap C is generated between the curved surface 54 and the radius of curvature Rm of the arcuate surface Ma cannot be measured. .

0004 Also, the arc length L' of the gauge part 54 is compared to the arc length Lm of the arc surface Ma of the object M. If the radius of curvature Rm is considerably short, errors are likely to occur in the measurement of the radius of curvature Rm.

[0005] For this reason, it is difficult to accurately measure the radius of curvature Rm of the arcuate surface Ma of the object M. In order to achieve this, it is necessary to have gauge portions 54 with the same radius of curvature R' and different arc lengths L'. It is necessary to manufacture and prepare R gauges 50 individually.

[0006] Furthermore, when the radius of curvature Rm of the circular arc surface Ma of the object to be measured M is different, Gauge parts 54 having various arc lengths L' with curvature radii R' corresponding to the curvature radius Rm are used. It is necessary to prepare the R gauges 50.

[0007] Therefore, the number of R gauges 50 is large, and the management thereof is complicated. Gauge section 54 suitable for the object to be measured M is selected from a large number of R gauges 50. It takes a lot of time and effort to select and measure R Gauge 50 with It was.

[0008] In view of the above points, the purpose of this invention is to easily measure the radius of curvature of the circular arc surface of the object to be measured. The goal is to provide a gauge that can.

[0009]

[Means to solve the problem]

In order to achieve the above objective, the present invention aims to improve the curvature half of the arcuate surface formed on the object to be measured. This is a radius gauge for measuring the diameter, and each curved part is attached to the outer periphery of the flat gauge body. A plurality of concave arc-shaped gauge parts having the same radius and different arc lengths are formed.

0010

[Effect]

In the R gauge configured as described above, for the circular arc surface of the object to be measured, While rotating the R gauge, press the multiple gauge parts against each other. Then, the measurement of the arcuate surface is performed.

[0011]

【Example】

Next, one embodiment of the present invention will be described based on the drawings. As shown in FIGS. 1 and 2, this R gauge 10 has a flat regular hexagonal shape. It is mainly composed of a page main body 12.

[0012] At each vertex of the gauge body 12, first to sixth gauge parts 21, 22, 23, 24, 25, and 26 each having a concave arc shape centered on points _O1 to _O6 are provided. ing. The radius of curvature R of each of the gauge parts 21 to 26 is all the same, and its value may be various, such as R=10, 20, or 30 (mm).

The central angles θ ₁ to _{θ 6} of the first to sixth gauge parts 21 to 26 are θ ₁ =360°/4, θ ₂ =360°/5, θ ₃ =360°/6, θ ₄ = 360°/7, θ ₅ = 360°/8, θ ₆ = 360°/9. Therefore, the arc lengths _L1 to _L6 of the first to sixth gauge parts 21 to 26 are _L1 = 2πR/4, _L2 = 2πR/5, _L3 = 2πR/6, _L4 = 2πR/7, L ₅ =2πR/8, L ₆ =2πR /9.

[0014] Further, the central part of the surface of the gauge body 12 is a radius of curvature display part 14, and a first ~The value of the radius of curvature R of the sixth gauge section is displayed. The R gauge 10 in this figure is R =20 (mm). And, if the R gauge is 10 as described above, then A plurality of pieces with different curvature radii R are prepared.

[0015] Next, how to use this R gauge 10 will be explained based on FIG. 3. The arcuate surface Ma of this object to be measured M has a radius of curvature Rm=20 ( mm), central angle θm = 60°, and arc length Lm = 40π/6 (mm).

[0016] The curvature of this object M is measured by a plurality of R gauges 10 having different radii of curvature R. After figuring out that the radius Rm is about Rm = 20, Take out the gauge 10 and insert a gauge part that seems appropriate (for example, the third gauge part 2). 3) is pressed against the arcuate surface Ma of the object M to be measured. At this time, the gauge part and the circle If it is determined that a gap has occurred between the arc surface Ma and the arc surface Ma, rotate the radius gauge 10 at hand. (see the arrow in the figure), and press the gauge part with a short arc length (for example, the fourth gauge part). 24) is pressed against the arcuate surface Ma of the object M to be measured. Repeating things like this, As shown in FIG. 3, the fifth gauge part 25 and the arcuate surface Ma of the object M are aligned. , it is accurate that the radius of curvature Rm of the circular arc surface Ma of the object to be measured M is Rm=20 (mm). is measured.

[0017] As mentioned above, in this R gauge 10, selection of the arc length is done in one R gauge. This can be done in one step, reducing the effort and time required to measure the radius of curvature. Ma In addition, the radius gauges that should be aligned to measure the radius of curvature of various objects to be measured are The total number can be reduced. In addition, in this R gauge 10, the gauge body 12 has a regular hexagonal shape. Therefore, when selecting the arc length, rotate it by hand and do it efficiently. be able to.

In the above embodiment, the values of the central angles θ ₁ to _{θ 6} of each gauge part were 360°/4 to 360°/9, but they may have other values. Good too. Further, the shape of the gauge body is not limited to a regular hexagon, but may be a regular pentagon, a regular octagon, or the like. Further, it may be circular or oval. In that case, a plurality of gauge parts are appropriately provided on the outer periphery of the gauge part. It goes without saying that the present invention can be implemented with various other modifications based on the knowledge of those skilled in the art.

[0019]

[Effect of the idea]

As described above, according to the present invention, the radius of curvature of the circular arc surface of the object to be measured can be measured. At this time, while rotating the radius gauge, place the multiple gauge parts on the circular arc surface. Arc surfaces can be measured by the simple operation of pressing each Therefore, the efficiency of the measurement is improved. In addition, it is available for measuring various objects to be measured. The number of R gauges to be kept is reduced, and their management becomes easier.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a plan view as well.

FIG. 3 is also an explanatory diagram of the action.

FIG. 4 is a diagram showing a conventional R gauge.

[Explanation of symbols]

10 Earl Gauge 12 Gauge body 21 First gauge section 22 Second gauge section 23 Third gauge section 24 4th gauge section 25 5th gauge section 26 6th gauge section

Claims (1)

[Scope of utility model registration request] Claim 1: A radius gauge for measuring the radius of curvature of an arcuate surface formed on an object to be measured, in which a plurality of gauges having the same radius of curvature and different arc lengths are arranged on the outer periphery of a flat gauge body. A radius gauge characterized by a concave arc-shaped gauge part.