JP3430991B2 - Auxiliary tool for hole position measurement - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a hole position measuring auxiliary tool used when measuring a hole position with a three-dimensional measuring device.

[0002]

2. Description of the Related Art Conventionally, a coordinate measuring machine 2 may be used to measure the position of a hole 30 provided in a metal plate 3 (see FIG. 3).
reference). When measuring the position, the first to third arms 21 to 21
23 and the measurement arm 20 are appropriately moved, and the measurement head 200 having the probe 201 at the tip of the measurement arm 20 is applied to the target hole 30, as shown in FIG. 6A. Sensors built in each arm 20-23 are arm 20-
The length and inclination angle of 23 are detected, the built-in computer of the coordinate measuring machine 2 calculates the hole position based on the detected values, and the result is displayed on the display device 25. In addition, the measurement performed by only applying the probe 201 of the measuring head 200 to the hole 30 in this way is called point measurement.

By the way, the probe 2 of the measuring head 200
For 01, a sphere made of cemented steel having a diameter of about 10 mm is usually used in view of processing accuracy. Therefore, diameter 10mm
Fig. 6
(B) As shown in FIG. 7, first, the probe 201 is applied to the A portion of the outer circumference 300 of the hole 30 to determine the position of the A portion. Next, the probe 201 is applied to the portion B and finally to the portion C to obtain the respective positions (in the case of three measuring points, more measuring points may be used). The position of the hole 30 is obtained from the obtained positions of the parts A to C. The measurement in which the probe 201 is applied to several measurement points on the outer circumference 300 of the hole 30 in this way is called circle measurement.

[0004]

However, in the circle measurement, as compared with the point measurement, the probe 201 is used several times in the outer circumference 30 of the hole 30.
It is necessary to bring it into contact with 0, which is troublesome and time consuming. In addition, it is difficult to increase the diameter of the probe 201 from the viewpoint of processing accuracy, and the measurement head 20 having the conventional size is used.
There was a need for a device that enables hole position measurement by point measurement while using 1 and the coordinate measuring machine 2.

The present invention has been made in view of the above conventional problems, and an object of the present invention is to provide a hole position measuring auxiliary tool capable of easily and promptly measuring the position of a hole having a larger diameter. It is a thing.

[0006]

According to a first aspect of the present invention, there is provided a moving portion and a guide portion for guiding the moving portion so as to be movable in one axis direction, and the moving portion is slidably disposed inside the guide portion. A hole position measuring auxiliary tool comprising the moving part having a concave conical portion at the upper end and a convex conical portion at the lower end, and the central axes of the convex conical portion and the concave conical portion are The hole position measuring auxiliary tool is characterized by being located on the same straight line.

Next, the operation of the present invention will be described. The hole position measurement by the three-dimensional measuring device when using the hole position measuring auxiliary tool according to the present invention is performed as follows (see FIG. 4 described later). The tip side surface of the convex conical portion of the moving portion is arranged to be in contact with the opening end surface of the hole. Then, the guide portion is inserted and arranged on the outer periphery of the moving portion. Since the central axes of the convex conical portion and the concave conical portion are located on the same straight line, the center of the hole can be aligned with the central axes. Then, by applying a probe of a three-dimensional measuring device to the concave conical portion, the center of the concave conical portion can be obtained, and thus the hole position can be obtained.

The diameter of the convex conical portion and the diameter of the concave conical portion are selected according to the diameter of the probe used and the diameter of the hole to be measured. It can be measured by point measurement regardless of size. In addition, by using the auxiliary tool of the present invention, the measurement can be performed by point measurement, which requires less time and effort than the circle measurement, and shortens the measurement time.

Further, the convex conical portion according to the present invention can be easily precision machined even if it has a large diameter. If the convex conical portion can contact the hole, the hole position can be measured by using the hole position measuring auxiliary tool of the present invention, so that the position of a hole having a larger diameter can be measured.

As described above, according to the present invention, it is possible to provide a hole position measuring auxiliary tool capable of easily and quickly measuring the position of a hole having a larger diameter.

It is preferable that the moving part is slidably fixed to the guide part in a detachable manner. This makes it possible to measure the positions of more types of holes by preparing a plurality of moving parts according to the probe used and the size of the hole to be measured and exchanging them according to the situation.

The object of hole position measurement using the hole position measurement auxiliary tool of this example is, for example, a through hole such as a screw hole or a drill hole provided in various plate materials, and particularly a portion serving as a measurement reference surface. Is not present in the plate material. Since the position of such a hole can usually be measured only by measurement using a three-dimensional measuring device, the hole position measuring auxiliary tool according to the present invention works very effectively. Further, it is also possible to apply to the measurement of recesses, grooves, etc., even if it is not a through hole.

Next, as in the invention described in claim 2, a pin groove for fixing the guide pin inserted through the guide portion from the outer surface of the guide portion is provided in the moving portion. It is preferable. As a result, the hole position can be measured while the moving part and the guide part are fixed during measurement.
Therefore, it is possible to prevent the measurement accuracy from deteriorating due to rattling of the moving part, the guide part, or the like during the measurement.

Next, as in the third aspect of the present invention, it is preferable that an adhesive tool is provided on the lower end surface of the guide portion so that the guide portion can be removed. As a result, the hole position measuring auxiliary tool can be firmly fixed by the adhesive at the time of measurement, and accurate measurement is possible. Also,
After the measurement, the auxiliary tool for measuring the hole position can be promptly removed. Moreover, since the hole position measuring aid can be fixed to the hole on the side surface, point measurement can be performed.

As the adhesive, a magnet is preferably used when the hole to be measured is provided on the metal plate. In addition, it can be composed of various adhesive tapes, adhesives and the like.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments A hole position measuring auxiliary tool according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the hole position measuring auxiliary tool 1 of this example comprises a moving part 11 and a guide part 15 for movably guiding the moving part 11 in one axial direction. It is slidably arranged inside. The upper end 111 of the moving part 11 has a concave conical part 12, the lower end 112 has a convex conical part 13, and the central axes of the convex conical part 13 and the concave conical part 12 are on the same straight line. To do.

The details will be described below. As shown in FIGS. 1 and 2, the moving portion 11 has a circular cross section and is a columnar shape. The upper end 111 has a concave conical portion 12 and the lower end 112 has a convex conical portion 13.
Have. The concave conical portion 12 is the upper conical portion 12 in order from the top.
1, a cylindrical portion 122 and a lower conical portion 123. Also,
A pin groove 119 for the guide pin 17 is provided on the outer side surface 110 of the moving portion 11. The guide portion 15 has a cylindrical shape with a circular cross section, has an adhesive 16 on the bottom surface 152, and has a pin hole 154 for the guide pin 17 penetrating from the outer surface 155 to the inner surface 150.

A set screw is used as the guide pin 17, the outer peripheral surface is a male screw, and a hexagonal hole for inserting a tool at the tip and screwing the screw into the pin hole 154 is provided. In addition, a female screw to be engaged with the guide pin 17 is provided on the inner surface of the pin hole 154.

Next, the three-dimensional measuring device 2 used in the hole position measurement of this example will be described. As shown in Figure 3,
The coordinate measuring machine 2 includes a movable base 26 and the base 26.
And a measurement arm supported by a pedestal 24. The measurement arms are the first arm 21, the second arm 22, and the third arm.
It consists of arms 23, each arm is connected by a joint,
Each is configured to move in any direction. First
A measuring arm 20 is provided at the tip of the arm 21, and a measuring head 200 having a probe 201 is further installed at the tip thereof as shown in FIG. This probe 20
Reference numeral 1 is made of super hard steel and has a spherical shape with a diameter of 10 mm.

Although not shown, the first to third arms 21 to 23 are provided with position detection sensors, and the position signals relating to the length and inclination angle of each arm obtained by the position detection sensors are tertiary. It is configured to be sent to the built-in computer of the original measuring instrument 2. Further, reference numeral 25 is a display device, which displays the measurement result of the coordinate measuring machine 2.

Next, the hole position measuring method of this example will be described. The target of measurement in this example is the position on the metal plate 3 of the hole 30 provided in the metal plate 3 as shown in FIG. As shown in FIG. 4B, the convex conical portion 13 of the moving portion 11 is arranged in the hole 30. At this time, the side surface 130 of the convex conical portion 13 contacts the opening end surface 31 of the hole 30, and is arranged so that the central axis of the moving portion 11 is perpendicular to the surface 39 of the metal plate 3. As a result, the central axes of the convex conical portion 13 and the concave conical portion 12 and the center of the hole 30 are located on the same straight line.

Next, the guide portion 15 is inserted from above so that the outer side surface 110 of the moving portion 11 and the inner side surface 150 of the guide portion 15 are in contact with each other, and the lower end 152 of the guide portion 15 is attached with a bonding tool 16 made of a magnet. The guide portion 15 is fixed to the surface 39 of the metal plate 3. Next, as shown in FIG. 1, the guide pin 17 is inserted into the pin hole 154 of the outer side surface 155 of the guide portion 15 to fix the guide portion 15 and the moving portion 11.

Then, the measuring arm of the three-dimensional measuring device 2 is moved to press the probe 201 against the concave conical portion 12 as shown in FIG. At this time, the side surface of the probe 201 is evenly contacted with the open end 115 of the concave conical portion 12. At this time, the central axes of the concave conical portion 12 and the convex conical portion 13 coincide with each other, and the center of the probe 201 coincides with the central axis of the concave conical portion 12. The central axis of the convex conical portion 13 also coincides with the center of the hole 30. Therefore, in the coordinate measuring machine 2, the sensors incorporated in the arms 20 to 23 detect the lengths and inclination angles of the arms 20 to 23, and the built-in computer of the coordinate measuring machine 2 determines the holes based on the detected values. The position is calculated and the result is displayed on the display device 25.

The hole position was actually measured using the hole position measuring auxiliary tool 1 of this example. At this time, a spherical probe 201 having a diameter of 10 mm was used. The measurement of each hole is performed 30 times, and the average time taken for each measurement will be described. When the probe was 10 mm and the hole was 22 mm, the hole position could be measured by the point measurement using the hole position measuring auxiliary tool 1 according to this example. It took, on average, 5 seconds to attach / detach the hole position measurement assisting tool 1 to / from the metal plate, and it took 10 seconds on average to make the measurement by applying the probe 201 to the concave conical portion. That is, one hole position measurement was completed in 15 seconds in total.

As a comparative example, when the measurement time by the conventional measurement method was examined, when the probe was 10 mm and the hole was 10 mm, the hole position could be measured by the point measurement as shown in FIG. It took 10 seconds for each measurement. When the probe is 10 mm and the hole is 22 mm, the above-mentioned FIG.
The hole position could be measured by circle measurement as shown in. 1 on average
It took 60 seconds for each measurement. As described above, according to the measuring method of this example, the hole position can be measured more quickly than the conventional circle measurement.

The operation and effect of this example will be described. By using the diameters of the convex conical portion 11 and the diameter of the concave conical portion 12 that match the diameter of the probe 201 and the diameter of the hole 30 to be measured, the center position of the concave conical portion 12, that is, the hole position, is set to the hole 30. It can be measured by point measurement regardless of the size of. Compared to circle measurement, point measurement requires less labor and measurement time is shorter.

Furthermore, the convex conical portion 12 can be easily precision machined even if it has a large diameter. Then, the convex conical portion 12 has a hole 30.
Since the hole position can be measured by contacting with, it is possible to measure the position of a hole with a larger diameter.

As described above, according to this embodiment, it is possible to provide a hole position measuring auxiliary tool capable of easily and promptly measuring the position of a hole having a larger diameter.

[Brief description of drawings]

FIG. 1 is an explanatory cross-sectional view of a hole position measuring auxiliary tool according to an embodiment.

FIG. 2 is a perspective development view of the hole position measuring auxiliary tool in the embodiment.

FIG. 3 is an explanatory diagram of a coordinate measuring machine according to an embodiment.

FIG. 4 is an explanatory view of a measuring method using a hole position measuring auxiliary tool in the embodiment.

FIG. 5 is an explanatory diagram of a measuring head of the coordinate measuring machine according to the embodiment.

FIG. 6 is an explanatory view of (a) point measurement in a conventional example,
(B) Illustration of circle measurement.

FIG. 7 is an explanatory diagram of circle measurement in a conventional example.

[Explanation of symbols]

1. ． ． Auxiliary tool for hole position measurement, 11. ． ． Moving part, 111. ． ． Top edge, 112. ． ． lower end, 12. ． ． Concave cone, 13. ． ． Convex cone, 15. ． ． Guide part, 16. ． ． Adhesive, 17. ． ． guide pin,

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01B 3/00-5/30 G01B 21/00-21/30

Claims (3)

(57) [Claims] 1. A hole position measuring auxiliary tool comprising a moving part and a guide part for movably guiding the moving part in one axial direction, and the moving part is slidably arranged inside the guide part. The upper end of the moving part has a concave conical part, the lower end has a convex conical part, and the central axes of the convex conical part and the concave conical part are located on the same straight line. Auxiliary tool for measuring hole position. 2. The hole position according to claim 1, wherein a pin groove for fixing a guide pin inserted through the guide portion from the outer side surface of the guide portion is provided in the moving portion. Measuring aid. 3. The hole position measuring auxiliary tool according to claim 1 or 2, wherein an adhesive tool is provided on the lower end surface of the guide section so that the guide section can be removed.