JPH0522802Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a reference gauge for zero-point adjustment of a ball-mounted micrometer that measures the tooth thickness of a gear, for example, for initial inspection of a ball-mounted micrometer in a manufacturing process. This invention relates to a reference gauge for checking 0 points for commercial purposes.

[Conventional technology]

Generally, when measuring the length of a component relatively accurately, a micrometer is used, and an ordinary micrometer is used (for example, "Easy to Understand Mechanical Course 16 Work Measurement" by Akihisa Kozaki, Shigeharu Ochiai Publisher: Meigensha Co., Ltd. (as shown on page 34).

However, in measuring the tooth thickness of a gear, due to the presence of teeth, a micrometer A with a ball is used, as shown in FIG. is used.

Then, a gauge body 1 of a reference gauge C (25mm, 50mm, 75mm...) with predetermined dimensions as shown in Fig. 4 is prepared.
A ball 3 fixed to an anvil 4 is in contact with one end 1a, a ball 3 fixed to a spindle 5 is in contact with the other end 1b, and both balls 3 of the micrometer with a ball are in contact with the grooves of the gear. The zero point of the micrometer with a ball is adjusted (confirmation of the reference point) by taking into consideration the amount of penetration at the time of the test.

Thereafter, using the ball-equipped micrometer A that has been adjusted to the zero point, as shown in FIGS. 5 and 6, the O, B, D measurement method is used. The tooth thickness of the gear 6 is measured by bringing the ball 3 fixed to the spindle 4 into contact with the ball 3 fixed to the spindle 5.

[Problem that the invention attempts to solve]

However, since the zero point adjustment of the ball-equipped micrometer is performed with reference to both flat end surfaces of the reference gauge C (or a reference rod with flat surfaces at both ends), the position of the ball 3 with respect to the flat end surfaces is Not sure.

For this purpose, it is necessary to find the minimum dimension while moving the ball-equipped micrometer A several times in the vertical or horizontal direction and perform zero point adjustment.

Therefore, individual errors (variations) are large, and the errors are more likely to occur as the size becomes larger.

Furthermore, in the zero point adjustment, it is necessary to take into consideration the shape of the ball 3 and to perform the conversion assuming a state in which the tooth thickness is actually being measured.

Therefore, the zero point adjustment work is complicated and requires advanced estimation techniques, and the measurement accuracy cannot be improved, making the work slow.

[Purpose of invention]

This invention was developed in view of the above, and allows for easy zero point adjustment (zero point alignment) when measuring gear tooth thickness, provides highly accurate measurement, and does not require advanced measurement technology. The object of the present invention is to provide a reference gauge for a micrometer with a ball.

[Means for solving problems]

The structure of the present invention to achieve the above object is that in a reference gauge for a ball-equipped micrometer that performs zero point adjustment by bringing the balls of the ball-equipped micrometer into contact with both ends of the gauge body, the gauge body is held at a predetermined position. The gage body has conical recesses at both ends that have a predetermined size when the ball of the ball-equipped micrometer comes into contact with the gauge body.

[Effect of invention]

By simply fitting the balls fixed to the anvil end and spindle end of the micrometer with balls into the respective conical recesses at both ends of the gauge body,
The same condition as when actually measuring the tooth thickness of a gear can be easily reproduced, and the zero point adjustment of the tooth thickness measurement of the gear can be easily performed with high precision.

[Example of idea]

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 shows an embodiment of a reference gauge for a micrometer with a ball according to the present invention.

The gauge body 1 is made of a heat-treated material, for example.
It is a rod-shaped material made of SKS3, and its hardness is HRC58.
~ 62 years old. This gauge body 1 is slightly shorter than the specified dimension L (nominal dimension of the micrometer)
The dimensions are L ₀ (to be exact, L ₀ +2Δx). Conical recesses 2 are formed at both ends 1a and 1b of the gauge body 1, respectively.

The dimension L ₀ of the gauge body 1 is the gauge body 1
The length of the gauge body 1 is a predetermined length L (25 mm, 50 mm,
75mm, 100mm...).
The general formula is L ₀ = L-5, where the dimension L ₀ of the gauge body 1, the predetermined dimension L, the diameter φ of the gauge body 1, the opening angle θ of the conical recess 2, and the shape that is fitted into and abutted in the recess 2. The diameter φ of the ball 3 has a relationship as shown in FIG. 2, for example. Incidentally, the conical opening angle θ of the recess 2 can be selected as an appropriate angle, but it is not limited to 90°.
Or 120° is appropriate.

Next, to adjust the zero point of the micrometer A with a ball using this reference gauge B, as shown in Fig. 3, first set the scale on the sleeve 8 side to 0, fix the spindle 5 with the lever 9, and then Then, the anvil 4 is moved by a required amount, and the balls 3 fixed to the anvil 4 and the balls 3 fixed to the spindle 5 are respectively fitted into the conical recesses 2 at both ends of the reference gauge B of the present invention and brought into contact with the lever 10. Fix the anvil 4 with. Further, turn the friction stop 11 two to three times and check the normal measurement pressure. If there is any error, fine adjustment is made at the sleeve 8 and the process is completed.

Thereafter, the tooth thickness l of the gear 6 can be measured accurately and efficiently using the ball-equipped micrometer A as shown in FIGS. 5 and 6.

[Effect of idea]

As described above, according to the present invention, zero point adjustment when measuring the tooth thickness of a gear becomes easy, and sophisticated measurement techniques are not required. Furthermore, there is no need to convert the actual tooth thickness measurement, improving measurement accuracy and making the work more efficient.

[Brief explanation of the drawing]

Fig. 1 is a partial cross-sectional plan view of an embodiment of the reference gauge according to the present invention, Fig. 2 is a diagram showing the dimensional relationship of the reference gauge, and Fig. 3 is a zero point adjustment using the reference gauge of the present invention. 4 is a plan view of a conventional reference gauge, and FIGS. 5 and 6 show a state in which the tooth thickness of a gear is measured using a micrometer with a ball. The figure is a front view, and FIG. 6 is a plan view. 1... Gauge body, 1a, 1b... End, 2...
Recess, 3...Ball, A...Micrometer with ball, B...Reference gauge.

Claims (1)

[Scope of utility model registration request] In the reference gauge for ball-equipped micrometers, which performs zero point adjustment by bringing the balls of the ball-equipped micrometer into contact with both ends of the gauge body, the gauge body is made slightly shorter than the specified dimensions, and the balls of the ball-equipped micrometer are adjusted. A reference gauge for a micrometer with a ball, characterized in that a conical recess that has a predetermined size when a ball comes into contact with it is formed at both ends of the gauge body.