JPS6145443Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hole positional deviation measuring device that can easily measure the positional deviation of a hole provided in a workpiece.

Generally, when trying to measure the positional deviation of a hole made in a workpiece, after measuring the positions of both ends of the hole from the reference plane using a dial gauge or cylinder gauge, the center position of the hole is determined based on the measured values. is calculated and compared with the reference hole position.

However, with the above-mentioned conventional method, it is necessary to accurately measure the positions of both ends of the hole, and after the measurement, the hole center position must be calculated, making the positional deviation measurement complicated and the measurement The disadvantage is that it takes a long time.

This invention was made in view of these drawbacks,
A jig is provided to position and support the workpiece, a reference hole is provided in the jig as a reference for measuring the positional deviation of the hole provided in the workpiece, and a measuring tool with a dial gauge attached to the reference hole is further provided. By inserting the measuring tool into the workpiece and rotating the measuring tool within the hole of the workpiece, the amount of deviation of the hole is directly displayed on the dial gauge, thereby eliminating the need for complicated measurements and calculations as in the past. It is an object of the present invention to provide a hole positional deviation measuring device that can easily measure the positional deviation of a hole in a simple manner and in a short period of time.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 shows a hole positional deviation measuring device A according to the present invention, in which reference numeral 1 denotes an L-shaped jig, and the jig 1 includes a support portion 2 installed on a reference plane and a support portion 2 disposed on a reference surface. The upper surface of the support part 2 is formed into a flat surface 2a, and the flat surface 2a has positioning pins 2b protruding from the flat surface 2a. A workpiece W such as a cylinder block provided with a camshaft hole as an object to be measured is positioned and supported with its machined hole Wa (camshaft hole etc.) facing the measurement section 3 through the workpiece.

Further, a reference hole 4 is drilled in the upper part of the measurement part 3, which is spaced a predetermined distance upward from the flat surface 2a of the jig 1, and serves as a reference when measuring the positional deviation of the processed hole Wa of the workpiece W. A measuring tool 5 is rotatably fitted into the reference hole 4.

As shown in enlarged detail in FIGS. 2 and 3, the measuring tool 5 has a cylindrical body 6 that is rotatably fitted into the reference hole 4 of the jig 1. consists of a cylindrical member 6a and a cylindrical crown member 6b that covers the tip of the cylindrical member 6a, and a dial gauge 7 is attached to the rear end of the cylindrical body 6 to connect a spindle portion 7a with a pin 8. In addition to being fixedly attached, a small diameter hole 9 is bored in the front part of the cylindrical body 6 (the front part of the crown member 6b), and the diameter hole 9 has one end surface. A pair of probes 1 are formed on inclined surfaces 10a and 10'a, and the other end faces are formed on hemispherical surfaces 10b and 10'b.
0 and 10' are slidably fitted with slopes 10a and 10'a at one end facing each other and hemispherical surfaces 10b and 10'b at the other end protruding from the crown member 6b. Further, a parallel hole 11 parallel to the diametric hole 9 is bored behind the diametric hole 9 (at the front end of the cylindrical member 6a), and the parallel hole 11 and the diametric hole 9 are connected to the cylindrical body. 6 is communicated with each other via a communication hole 12 bored in the axial center of the shaft. The above parallel hole 11
A cylindrical slide member 13 is slidably fitted in the cylindrical slide member 13 . On the other hand, a taper cone member 14 having a cone portion 14a at the tip and a shaft portion 14b at the rear is disposed in the communication hole 12, and the taper cone member 14 has one end connected to one end of the slide member 13 (the lower end in FIG. 2). forward (towards the left in the figure) by a spring 16 fixed with a screw 15 to
The tapered surface 14c of the cone portion 14a is biased by the slopes 10a and 1
0'a, and the shaft end of the shaft portion 14b of the tapered cone member 14 slides into an axial hole 13a provided in the center of the slide member 13 parallel to the axial direction of the cylindrical body 6. possible to be mated. Further, at the rear of the parallel hole 11 (at the front end of the columnar member 6a of the columnar main body 6), the parallel hole 1
A lever chamber 17 is formed in communication with the lever chamber 17, and an L-shaped lever 18 is disposed in the lever chamber 17 with its intermediate portion rotatably supported by the cylindrical body 6 by a pin 19. One end of the lever 18 is engaged with the slide member 13 via an engagement pin 20 implanted in the slide member 13, and the other end of the lever 18 is connected to the axial center of the cylindrical body 6. It is engaged with the spindle portion 7a of the dial gauge 7 via a rod 22 disposed in a central hole 21 bored through it, and is interposed between the rod 22 and the cylindrical body 6. Spring 23
The rod 22 is urged forward to urge the lever 18 clockwise in FIG.
The slide member 13 is biased in one direction (upward in FIG. 2) through the 0. In addition, 2
Reference numerals 4 and 24 denote the measuring elements 1 fitted into the long grooves 10c and 10'c provided on the side surfaces of the measuring elements 10 and 10'.
0, 10' a pin for preventing slippage, 25 a balance spring that presses the engagement pin 20 in the opposite direction to the biasing direction of the spring 23, 26;
A bolt 26 fixes the crown member 6b to the columnar member 6a.

Next, the operation of the above embodiment will be explained.
First, the measuring tool 5 is moved along the inner wall of the reference hole 4 of the jig 1, and the measuring elements 10 and 10' are moved along the inner wall of the reference hole 4 of the jig 1.
The dial gauge 7 is brought into sliding contact with the inner wall of the dial gauge 7, and the zero point of the dial gauge 7 is adjusted in this state. After that, the measuring tool 5 is inserted into the machined hole Wa of the workpiece W, and the measuring elements 10 and 10' are brought into sliding contact with the inner wall of the machined hole Wa of the workpiece W.
Measurement of the positional deviation of the hole in the workpiece W is started.

Now, if the machined hole Wa (hole to be measured) of the workpiece W (object to be measured) is drilled at a position apart from the flat surface 2a of the jig 1 by a predetermined distance, that is, at a regular position, the measurement The probes 10 and 10' are both pressed down by the same distance toward the axial center of the cylindrical body 6 and are in contact with the inner wall of the hole Wa to be measured.
4 is pressed in the axial direction against the biasing force of the spring 16 and only slides in the axial hole 13a of the slide member 13, and even if the measuring tool 5 is rotated, the taper cone member 14 is not displaced. 22, and therefore the dial gauge 7 continues to display the amount of deviation as zero.

On the other hand, for example, the hole to be measured of the object W to be measured
If the hole Wa is deviated downward by δ from the normal position, the measuring tool 5 can be rotated to bring both the measuring tips 10 and 10' into sliding contact along the inner wall of the hole Wa to be measured. , as shown in FIG.
0 reaches the top of the measurement hole Wa, the measurement point 10 is pushed down inward by the abutting engagement between the measurement point 10 and the measurement hole Wa, and moves downward by δ. , the other measuring element 10' is pressed downward by the measuring element 10, projects into the hole Wa to be measured by δ, and comes into contact with the inner wall of the hole Wa to be measured. At the same time, the tapered cone member 14 moves in the axial direction and moves downward by δ due to the downward movement of the measuring head 10, so that the slide member 13 moves downward and levers the lever via the engagement pin 20. Press one end of 18. Accordingly, the lever 18 rotates counterclockwise in FIG. 2 about the pin 19, presses one end of the rod 22, and pushes the rod 22 backward (towards the right in the figure) against the biasing force of the spring 23. ) to press the spindle portion 7a of the dial gauge 7.
displays the deviation amount δ in an enlarged manner. Therefore, the object to be measured W
After inserting the cylindrical body 6 into the measurement hole Wa,
By rotating the measuring tool 5, the deviation amount δ of the hole Wa to be measured is automatically displayed on the dial gauge 7, so there is no need to perform complicated measurements or calculations as in the past. It is possible to measure the positional deviation of holes easily and in a short time.

As explained above, the hole position deviation measuring device of the present invention includes a jig for positioning and supporting the object to be measured, and a measuring tool that can be rotatably inserted into a reference hole provided in the jig. The measuring tool consists of a cylindrical body that fits into the reference hole, a dial gauge attached to the rear end of the body, and a dial gauge that faces and opposes the diametrical hole provided in the front of the body. a pair of probes that are slidably fitted and each having a sloped end face that faces each other; a slide member that is slidably fitted into a hole provided parallel to the diametrical hole; and a tip. a tapered cone member having a cone portion slidingly in contact with the slope of the measuring head, and a shaft portion slidably fitting into a hole parallel to the body axis direction provided in the slide member at the rear; The lever is rotatably supported by a cylindrical body, and has one end that engages with the slide member and the other end that engages with the dial gauge to move the detection section of the dial gauge. Since the positional deviation of the hole can be measured easily and in a short time, the efficiency of the positional deviation measurement can be improved.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a partially cutaway side view, FIG. 2 is an enlarged vertical sectional view of the measuring instrument, and FIG. 3 is a sectional view taken along the - line in FIG. 2.
FIG. 4 is an explanatory diagram of the operation. A...Measuring device, 1...Jig, 2...Support part,
3... Measuring part, 4... Reference hole, 5... Measuring tool, 6
...Cylindrical body, 7...Dial gauge, 9...
Diameter hole, 10, 10'...Measuring point, 10a,
10'a... Slope, 10b, 10'b... Hemisphere,
11... Parallel hole, 13... Slide member, 13a
...Axis hole, 14... Taper cone member, 14a
... Cone part, 14b ... Shaft part, 14c ... Tapered surface, 17 ... Lever chamber, 18 ... Lever, 22
...Rod, W...Object to be measured (work), Wa...
Measured hole (processed hole), δ...Amount of deviation.

Claims (1)

[Scope of utility model registration request] It consists of a jig that positions and supports the object to be measured, and a measuring tool that can be rotatably inserted into a reference hole provided in the jig, and the measuring tool has a cylindrical body that fits into the reference hole, , a dial gauge attached to the rear end of the main body and a diametrical hole provided in the front part of the main body are slidably fitted so as to oppose each other, and the opposing end surfaces are formed as slopes. A pair of gauge heads, a slide member slidably fitted into a hole provided parallel to the diametrical hole, a cone portion at the tip that slides into contact with the slope of the gauge head, and a slide member at the rear. A tapered cone member having a shaft portion that slidably fits into a hole parallel to the main body axis direction provided in the member, an intermediate portion rotatably supported by the cylindrical main body, and one end engaged with the slide member. and a lever having the other end engaged with the dial gauge so as to move a detecting section of the dial gauge.