JPH0532721Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an apparatus for measuring whether the diameters of a plurality of holes formed in a workpiece are each finished to a required precision.

Conventional technology Holes for assembling serration bolts in axle hubs, which are one of the most important safety parts in automobile parts, require special precision in relation to bonding strength and positioning with later-installed parts. After drilling holes, a rod-shaped hole gauge is inserted and removed to check whether the hole diameter is within an allowable range or not.

Problems that the invention attempts to solve For example, when the reference hole diameter is
For workpieces that are divided into several different types, such as 12.5 mm and 14.0 mm, each type has a different allowable range of hole diameter, so multiple hole gauges with hole gauges made for each standard hole diameter are used. A hole diameter inspection line was installed, and there was a limit to efforts to reduce costs.

Therefore, by injecting an air jet into the hole to be measured and converting the flow rate of the air jet passing through the hole into an electrical quantity, the hole diameter measurement line, which used to be separate for each reference hole diameter, can be combined into one common line. However, there may be a means to convert the flow rate of the air jet into an electrical quantity, a means to input the electrical quantity from this means, and a means to determine whether the hole diameter is within the allowable range for each reference hole diameter, etc. The structure becomes complicated and the entire device becomes expensive, making it difficult to adopt it suddenly.

Therefore, the present invention focuses on the low cost of the rod-shaped hole gauge and provides a hole diameter measuring device that can be used on a shared line.

Means for Solving the Problems The hole diameter measuring device of the present invention is a device for inspecting the suitability of the hole diameter of each of a plurality of holes formed in a workpiece, and for each hole in the workpiece. A plurality of hole gauges in which a plurality of sets of gauge regions are arranged in the axial direction by combinations of a minimum diameter shaft portion and a maximum diameter shaft portion within the allowable range of the hole diameter on a rod body that is individually driven to be inserted and extracted; A number of sets of sensors equal to the number of the gauge areas are provided individually corresponding to the hole gauges, and detect whether the diameter of the hole is within an allowable range based on the insertion displacement of the hole gauge with respect to each hole. We are prepared.

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

As shown in FIGS. 1 and 2, the inspection device provided on the inspection stage S roughly corresponds to a plurality of (five in this example) hole gauges 1 and each hole gauge 1. The apparatus includes proximity switches 2 and 3 as sensors provided individually, and a work presence/absence detection mechanism 4.

Axle hub W as a workpiece to be inspected
is transported along the transport rail 6 on the bed 5 to the inspection stage S by a transport device (not shown), and is centered and positioned by raising the center 7 of the test stage S. Ru.

Note that FIG. 1 is a single diagram in which the different measurement states of the axle hub W in the right half and the left half are combined.

Each hole gauge 1 is used to check the hole diameters of a plurality of holes 8 to which serration bolts of an axle hub W are later attached. Since the measurements are to be made at the same time, the number of holes is the same as the number of holes 8.

Each hole gauge 1 is arranged above the inspection stage S so as to be coaxial with the hole 8 via a storage box 9.

The frame 11 of the storage box 9 is a pedestal 10.
The slider 12 is fixed to the upper slider 12, and the slider 12 is moved up and down by the expansion and contraction of a cylinder 13 also installed on the frame 10. As the storage box 9 moves up and down, the hole gauge 1 is individually inserted into and removed from each hole 8 of the axle hub W supplied to the inspection stage S.

As shown in FIG. 3, each hole gauge 1 has a gauge attachment 15 removably connected to the tip of a gauge body 14, and a detection rod 17 connected to the upper end of the gauge body 14 via an adapter 16. Each hole gauge 1 is formed into a long rod shape as a whole. And each hole gauge 1
The gauge body 14 is attached to a thrust ball bearing 19 on the lowermost support plate 18 of the storage box 9.
and a radial ball bearing 20 so as to be movable up and down, and each hole gauge 1
A detection rod 17 passes through an intermediate plate 21 and an upper plate 22 above the support plate 18, and is guided by a bush 23 of each plate 21, 22 so as to be movable up and down.

Here, when assembling the thrust ball bearings 19, as shown in FIG.
By assembling the gauge body 14 upside down, the gauge body 14 of each hole gauge 1 is given a predetermined play in its diametrical direction.

Further, a spring seat 25 is fixed to the gauge body 14 of each hole gauge 1, and a coil spring 26 interposed between the spring seat 25 and the intermediate plate 21 allows each hole gauge 1
is urged downward, and the lowering limit of each hole gauge 1 relative to the storage box 9 is set by the contact between the lower large diameter portion 27 of the spring seat 25 and the seat 28 on the support plate 18 side. Location is regulated.

The detection rod 17 of each hole gauge 1 is provided with two upper and lower dogs 29 and 30, respectively.

On the other hand, gauge attachment 1 for each hole gauge 1
5, a plurality of sets of gauge regions 31 and 32 are arranged in a row along its axial direction, as shown in FIGS. 3 and 4.

Since the plurality of gauge regions 31 and 32 correspond to the number of types divided based on the reference hole diameter of each hole 8 of the axle hub W, one of the gauge regions 31 among them corresponds to one reference. The minimum diameter shaft part 33 and the maximum diameter shaft part 34 of the allowable range of the hole 8 set to the hole diameter are combined, and the other gauge area 32 is a hole set to another reference hole diameter. A minimum diameter shaft portion 35 and a maximum diameter shaft portion 36 within the allowable range of 8 are combined.

Furthermore, since each hole gauge 1 is inserted into and removed from the hole 8 in the plurality of sets of gauge regions 31 and 32, the gauge region 31 corresponding to the smaller reference hole diameter is provided at the lower end side of the gauge attachment 15. They are arranged from the lower end of the hole gauge 1 to the upper end: a minimum diameter shaft portion 33, a maximum diameter shaft portion 34, a minimum diameter shaft portion 35, and a maximum diameter shaft portion 36.

Proximity switches 2 and 3 as sensors are provided in the same number as the gauge areas 31 and 32 for each hole gauge 1, and the hole diameter is adjusted to the allowable range by the displacement of insertion and movement of each hole gauge 1 into the hole 8. This is for detecting whether or not the holes are in the storage box 9, and is mounted via a bracket 37 on the intermediate plate 21 in the storage box 9 for each hole gauge 1 in correspondence with the dogs 29, 30.

One proximity switch 2 inserts and moves the hole gauge 1 into the corresponding hole 8 so that the minimum diameter shaft portion 33 of one gauge region 31 enters the hole 8, and the maximum diameter shaft portion 34 of the one gauge region 31 enters the hole 8.
The upper dog 29 is turned ON only when it comes into contact with the periphery of the hole 8 of the axle hub W without entering the hole 8, and a hole diameter appropriate signal indicating that the hole diameter is within the allowable range is activated. This outputs the following.

Therefore, if the minimum diameter shaft portion 33 of one of the gauge areas 31 does not enter the hole 8, or if the maximum diameter shaft portion 34 does enter the hole 8, the upper dog 29 will be moved to the proximity switch 2. Proximity switch 2 will not turn on because the hole is not close to the hole diameter error signal will be output.

The function of the other proximity switch 3 is similar to that described above, and the hole gauge 1 is inserted and moved into the corresponding hole 8, so that the minimum diameter shaft portion 35 of the other gauge area 32 enters the hole 8, and the maximum diameter shaft thereof is moved. Only when the portion 36 comes into contact with the periphery of the hole 8 of the axle hub W without entering the hole 8, the lower dog 30 is turned ON as a proximal object, indicating that the hole diameter is within the allowable range. Outputs diameter appropriate signal. If the minimum diameter shaft part 35 of the other gauge area 32 does not fit into the hole 8, or if the maximum diameter shaft part 36 does not fit into the hole 8, the lower dog 30 is inserted into the proximity switch 3. Since they do not approach, the proximity switch 3 does not turn on and outputs a hole diameter error signal.

The work presence detection mechanism 4 detects whether or not the axle hub W is on the inspection stage S for each inspection operation, and detects whether or not the axle hub W is on the inspection stage S by using a push rod 38 attached to the storage box 9 and the displacement of this push rod 38. A proximity switch 39 outputs an axle hub W presence/absence detection signal. That is, the push rod 38 passes through the support plate 18 and the intermediate plate 21 of the storage box 9 and is guided to the push rods 40 so as to be able to move up and down, and a contact 41 is provided at the lower end projecting downward from the support plate 18. It is installed. The push rod 38 is urged downward by a coil spring 42 interposed between the contact 41 and the support plate 18, and at the same time, the push rod 38 is urged downward by a stopper 43 provided at an intermediate portion of the push rod 38. The lower limit position is regulated by contact with the plate 21.

On the other hand, the proximity switch 39 is attached to the frame 11 via a bracket 44, and when the storage box 9 moves downward and the axle hub W is present on the inspection stage S, the contactor 41 is attached to the upper end surface of the shaft portion of the axle hub W. When it comes into contact with the push rod 3
Since 8 moves upward relative to storage box 9,
The proximity switch 39 is turned ON using the dot 45 provided at the upper end of the push rod 38 as a proximity object.
It operates and outputs a work presence detection signal. Also,
On the contrary, when the axle hub W is not present on the inspection stage S when the storage box 9 is lowered,
Since the push rod 38 continues to move downward together with the storage box 9, the proximity switch 39 is not turned on by the dock 45 and outputs the no-work detection signal.

According to the structure of the embodiment described above, when the storage box 9 is moved downward by the drive of the cylinder 13, the work presence detection mechanism 4 detects whether or not the axle hub W is present on the inspection stage S. When the work presence detection mechanism 4 outputs a work presence detection signal, the cylinder 13 continues to be driven.
Then, each hole gauge 1 is inserted and moved into the corresponding hole 13 of the axle hub W by the force of the coil spring 26, and the displacement of the hole gauge 1 determines whether the hole diameter of each hole 8 is within an allowable range. are individually detected by the proximity switch 2 or 3.

If there is a slight misalignment between each hole gauge 1 and the corresponding hole 8, the diameter of each hole gauge 1 will be adjusted due to the play set in the thrust ball bearing 19 shown in FIG. Since it has the degree of freedom of sliding in the direction, the above-mentioned misalignment error is absorbed and corrected by the contact between the tapered portion 15a at the tip of each hole gauge 1 and the opening edge of each hole 8.

To simplify the explanation here, assuming that the hole 8 to be inspected is based on the reference hole diameter corresponding to one gauge area 31, the hole 8 as shown in FIG. If the diameter of is within the allowable range, the minimum diameter shaft portion 33 of one gauge area 31 will fit into the hole 8, and the stepped portion will fit into the axle hub W without the maximum diameter shaft portion 34 entering the hole 8. Since it comes into contact with the peripheral edge of the hole 8, the proximity switch 2 is turned ON using the upper dog 29 as a proximity object, and the proximity switch 2 outputs a hole diameter appropriate signal.

On the other hand, as shown in FIG. 5B, if the diameter of the hole 8 is below the allowable range, one gauge area 31
Since the minimum diameter shaft portion 33 of the axle hub W does not enter the hole 8 and only contacts the peripheral edge of the hole 8 of the axle hub W, the upper dog 29 does not descend to the position where the proximity switch 2 is actuated. The proximity switch 2 then remains in the OFF state and outputs a hole diameter abnormality signal.

Similarly, as shown in FIG.
The maximum diameter shaft portion 34 of the axle hub W enters the hole 8 of the axle hub W, and the upper dog 29 engages the proximity switch 2.
Since the proximity switch 2 passes through a position where it can be turned ON, it remains in the OFF state and outputs a hole diameter abnormality signal.

Therefore, by monitoring the output of the proximity switch 2 provided individually corresponding to each hole gauge 1, it is possible to detect which of the five holes 8 formed in the axle hub W by the ON operation of the proximity switch 2. Only the hole 8 for which the hole diameter appropriate signal was output is considered to have a hole diameter within the allowable range and is judged to pass, and for the other holes 8, the hole diameter is outside the allowable range and is judged to fail. will be done.

In this case, when the hole diameter is judged to be unacceptable because it is outside the allowable range, the proximity switch 2 does not turn ON as described above, so the hole diameter is probably too large. Therefore, it is not possible to determine why the test is rejected.

Therefore, as shown in FIGS. 1 and 2, an indicator 46 colored with paint or the like is provided at the upper end of the detection rod 17 forming each hole gauge 1, and a scale mark adjacent to each detection rod 17 is provided. The plate 47 has standard hole diameter dimensions such as "φ12.5" and "φ14.0", as well as "(-)NG" and "NG" indicating whether the hole diameter is too small or too large for the standard hole diameter dimension. (+)NG” etc., each hole gauge 1
Depending on the position of the indicator 46 according to the displacement of the hole, it is possible to visually identify whether the hole diameter is too small or too large.

Once the appropriateness of the hole diameter of each hole 8 has been determined in the above manner, the storage box 9 is raised to the upper limit position by the feeding operation of the cylinder 13, and one inspection cycle is completed.

Furthermore, as described above, even if the work presence detection mechanism 4 outputs a no-work signal during the intended downward movement of the storage box 9 in the inspection cycle, the cylinder 13 immediately raises the storage box 9. .

On the other hand, when the hole diameter of the hole 8 to be measured is based on the reference hole diameter corresponding to the other gauge area 32, as shown in FIG. The suitability of each hole diameter is detected by the proximity switch 3 having the lower dog 30 as a proximate object, and the suitability of each hole diameter is determined in the same manner as above. .

Effects of the invention As described above, according to the invention, multiple workpieces with different hole diameters can be inspected on one inspection line using rod-shaped hole gauges, which increases the versatility and flexibility of the equipment. This has the practical effect of making it possible to create a shared line at a lower cost than the conventional air jet type.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional explanatory diagram showing an embodiment of the present invention;
Figure 2 is an explanatory cross-sectional view taken along line A-A in Figure 1, Figure 3 is an enlarged view of the main part of Figure 1, Figure 4 is an enlarged view of the gauge attachment in Figure 3, and Figure 5. and the sixth
The figure is an explanatory diagram of the operation when measuring the hole diameter. 1... Hole gauge, 2, 3... Proximity switch (sensor), 8... Hole, 14... Gauge body, 15...
...Gauge attachment, 29,30...Dog, 31,32...Gauge area, 33,35...
Minimum diameter shaft portion, 34, 36... Maximum diameter shaft portion, W...
Axle hub (work).

Claims (1)

[Claims for Utility Model Registration] A device for inspecting the suitability of the diameter of each of a plurality of holes formed in a workpiece, comprising a rod that is driven to be inserted into and removed from each hole of the workpiece individually. A plurality of hole gauges in which a plurality of sets of gauge areas are arranged in the axial direction by combining the minimum diameter shaft part and the maximum diameter shaft part of the permissible range of the hole diameter, and individually provided corresponding to each of the hole gauges. and the same number of sets of sensors as the gauge areas, which detect whether the diameter of the hole is within an allowable range based on the insertion displacement of the hole gauge with respect to each hole. Diameter measuring device.