JP2689393B2 - Method for measuring misalignment of a hole formed orthogonal to the axis of a shaft - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a misalignment measuring method for a hole formed so as to be orthogonal to the axis of a shaft body to which a gear is attached, for example.

[Conventional technology]

Conventionally, for measuring the misalignment of a hole formed to be orthogonal to the axis of a shaft, a method using an indexing table, a method using a three-dimensional measuring device, and the like have been used.

[Problem to be solved]

As shown in FIG. 2, both the method of measuring the misalignment of the hole 2 formed orthogonal to the axis of the shaft 1 using an indexing table, the method of measuring with a three-dimensional measuring device, etc. Yes, it was not something that anyone could easily measure.

Therefore, the present invention is to attach a new probe to a measuring instrument for measuring a linear distance, and set a shaft body in which a pin is inserted into a hole to be measured on a flat substrate, in other words, a simple device. It is an object of the present invention to provide a method by which anyone can easily measure the misalignment easily without degrading the measurement accuracy.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention is arranged so that it is orthogonal to the axis of a shaft body that is an object to be measured on a flat base provided opposite to the tip of a slide rod of a measuring instrument that measures a linear distance. With the pin inserted into the formed hole, set the shaft body by laying it down, contacting both ends of the pin protruding from the hole,
In addition, a probe with a bottom surface parallel to the top surface of the flat base is attached to the tip of the slide rod, and the value measured by the instrument when the pin is pressed from above is used as the reference value, and then the shaft is inverted. This is to calculate the half of the error from the reference value measured by contacting the probe with both ends of the pin.

[Action]

In this invention, a measuring element is provided at the tip of a slide rod of a measuring instrument such as a dial gauge or a digital linear scale (DLS), and a shaft body with a pin inserted in a hole is set on a flat substrate, and the slide rod is set. Lower the probe so that the bottom surface of the probe comes into contact with both ends projecting from the hole in the pin.In this condition, the measurement value of the measuring instrument is set to zero. 1/2 the measured value of the measuring instrument when
Will be misaligned.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

For measuring a linear distance, a measuring element 5 is attached to the tip of a slide rod 4 of a measuring apparatus 3 such as a digital linear scale, the measuring apparatus 3 is set on a stand 6, and the bottom surface of the measuring element 5 is mounted on this stand 6. A flat base 7 having an upper flat surface parallel to is provided. The shaft 1 is laid on the base 7 and set in a hole 2 formed at right angles to the axis of the shaft 1.
The pin 8 is inserted in the inside so that both ends of the pin 8 project from the hole 2. In the state shown in FIG. 1, the slide rod 4 is lowered to press the surface end of the pin 8 with the bottom surface of the probe 5. This state is as shown in FIG.
The measuring instrument 3 is set to zero with the bottom surface of the pin contacting both ends of the pin 8. Next, the shaft 1 on the plane base 7 is inverted and the probe 5 is brought into contact with the pin 8 in the same manner as shown in FIG. Half of the measured value at this time is the misalignment.

As the probe 5, the parallelism between the bottom surface and the plane substrate 7 is within 5 μm, and φD shown in FIG.
The average value of the measurement result and the required time of the object to be measured in which the hole 2 with φd of 1.5 mm was formed for the 5 mm object was 0.0825.
mm; 20 seconds / piece.

On the other hand, the results and the time required using the conventional indexing table are 0.079 mm; 13 to 15 seconds / center on average, and the results using the three-dimensional measuring device are 0.077 mm; 7 minutes. / Number.

This method was found to be extremely accurate in a short time. Further, when the conventional indexing table is used, the pin 8 inserted into the hole 2 is such that there is no rattling with respect to the hole 2 (the difference between the diameter of the pin 8 and φd is small). However, in the present invention, the measurement accuracy does not change even if the pin 8 is somewhat loosened with respect to the hole 2. Therefore, it is not necessary to prepare the pins in fine dimensional steps.

The shape of the tracing stylus 5 is such that both ends have flat bottom surfaces, the central part has an arch-shaped recess, and the upper part has a screw 9 for attaching to the slide rod 4.
It is desirable to prepare the measuring elements 5 of several sizes so as to be able to cope with the case where the diameter of the shaft body 1 as the measurement object is different.

The shaft body 1 as shown in FIG. 2 is used for mounting knobs and the like of the volume, and is also used for rotary shafts of various precision machines and the like.

〔effect〕

As described above, according to the present invention, a simple instrument is used, that is, a measuring element is attached to a slide rod of a measuring instrument for measuring a linear distance, and a flat surface having an upper surface parallel to the bottom surface of the measuring element. Set the shaft lying on the base, set the bottom of the contact point on both ends of the pin inserted in the hole of the shaft, and use the value measured by the measuring device as the reference value. By calculating 1/2 of the error between the measured value and the reference value, anyone can easily measure the misalignment of the hole in a short time with high accuracy without requiring special training. In addition, since there may be some play between the pin and the hole, it is possible to deal with the pin without preparing it in small dimensional steps.

[Brief description of the drawings]

FIG. 1 is a side view showing the entire apparatus used in the measuring method of the present invention, FIG. 2 is a side view showing a shaft body as an object to be measured, and FIG. 3 is a partially enlarged view of a measuring state. 1 ... Shaft, 2 ... Hole, 3 ... Measuring instrument, 4 ... Slide rod, 5 ... Measuring element, 7 ... Planar base, 8 ... Pin.

Claims (1)

(57) [Claims] 1. A flat substrate (7) provided facing the tip of a slide rod (4) of a measuring device (3) for measuring a linear distance.
With the pin (8) inserted into the hole (2) formed perpendicular to the axis of the shaft body (1) to be measured, the shaft body (1) is laid down and set, and the hole ( Attaching a probe (5), which is in contact with both ends of the pin (8) protruding from 2) and has a bottom surface parallel to the top surface of the flat base (7), to the tip of the slide rod (4), and performs this measurement from above. The reference value is the value measured by the measuring instrument (3) when the pin (8) is held down by the child (5), and then the shaft body (1) is inverted to place the contact point (5) on both ends of the pin (8). 1 / of the error from the reference value measured by abutting
A method for measuring the misalignment of a hole formed so as to be orthogonal to the shaft body, characterized by calculating 2.