JPS63168506A - Method and apparatus for measuring wall thickness of flexible cylindrical body - Google Patents

Abstract

PURPOSE:To automatically perform measurement with good accuracy, by a method wherein a flexible cylindrical body is mounted to a rotatable columnar jig through a revolving mechanism to be externally fitted to said jig and a plurality of the measuring means arranged around the columnar jig is allowed to advance to actually measure the wall thickness of the cylindrical body. CONSTITUTION:A columnar jig 10 is formed so as to have a diameter slightly smaller than the inner diameter of a flexible cylindrical body W and mounted to the support rod 17 vertically provided on the center jig 16 incorporated in a revolving table 15 so as to insert said rod 17 through the jig 10 and fixed thereto at the upper end thereof by a nut 18. At first, the shift of a zero point is measured at each measuring point of the columnar jig 10 by a measuring means 13 to be stored in a control apparatus 14. Next, the flexible cylindrical body W is mounted to the columnar jig 10 rotatable through a revolving mechanism 11 so as to be externally fitted thereto and a plurality of the measuring means 13 arranged around the columnar jig 10 are allowed to advance toward a plurality of the places of the outer peripheral surface of the flexible cylindrical body 10 through an air cylinder 28 to actually measure the wall thicknesses at five points A, B, C, D, E. Then, these measured values are inputted to the control apparatus to be corrected. Therefore, measuring accuracy is enhanced.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a method and device for measuring the wall thickness of a flexible cylindrical body, and more specifically to a method for measuring the wall thickness of a flexible cylindrical body. The present invention relates to a method and device for measuring the wall thickness of a flexible cylindrical body, which automatically and accurately measures the wall thickness of a flexible cylindrical body and automatically determines whether the product is within specifications.

[Prior art]

BACKGROUND ART Generally, a shock absorber or other shock absorber is used in a vehicle suspension system, and one example of such a shock absorber is shown in FIG. 5.

In this shock absorbing device, one end of a cylindrical rubber cylinder 2 is caulked and fixed to the outer peripheral surface of the upper end of a damper 1, and the other end of the rubber cylinder 2 is bent into a U-shape. A metal fitting 4 is fixed to the surface via a fastening metal fitting 5.

The metal fitting 4 is fixed to the rod 6 of the damper 1, and a sealed air chamber 7 is formed inside the metal fitting 4.

By the way, the cylindrical rubber cylinder 2 as described above is formed into a conical tube shape, and the small diameter portion 2a is fixed to the outer peripheral surface of the upper end of the damper 1, and the large diameter portion 2b is fixed to the outer peripheral surface of the upper end of the damper 1. It is fixed to the metal fitting 4 in a downwardly bent state.

Therefore, the small diameter portion 2a and the large diameter portion 2 of the rubber cylindrical body 2
Regarding the wall thickness of b, precision is required from the viewpoint of workability during assembly, and since the wall thickness in the center part is constantly moved in the vertical direction, thin wall thickness or uneven wall thickness in the circumferential direction will affect performance. It is said to have a significant impact on lifespan.

Therefore, when manufacturing a cylindrical rubber cylinder body 2, wall thickness accuracy has been a serious problem, and wall thickness measurements have been performed even after manufacturing.

The conventional method for measuring cylindrical bodies is to attach a receiving part and a micrometer facing each other to the end of a U-shaped jig, insert the object to be measured between them, and operate the micrometer to measure the required value. At least 20 points or more were measured for each one by hand according to the position and circumference side.

For this reason, in terms of measurement accuracy, it has been impossible to handle the receiving part and the micrometer independently for measurement, and it has been difficult to perform accurate measurements.

[Purpose of the invention]

The present invention was devised by focusing on such conventional problems, and its purpose is to automatically measure the wall thickness of a flexible cylindrical body without any manual intervention. The present invention provides a method and apparatus for measuring the wall thickness of a flexible cylindrical body, which can measure the thickness with high accuracy and improve workability.

[Structure of the invention]

In order to achieve the above object, the present invention provides a method for measuring the wall thickness of a flexible cylindrical body, which measures and inspects the wall thickness of a flexible cylindrical body having a predetermined length at multiple points. is fitted and attached to a rotatable cylindrical jig via a turning mechanism, and a plurality of measuring means arranged around the cylindrical jig are advanced at multiple locations on the outer circumferential surface of this flexible cylindrical body. By actually measuring the wall thickness, inputting this measured value to the control device, and comparing and calculating the subtraction correction value of the measured value of the outer peripheral surface of the cylindrical jig with the upper and lower limit set values, the flexible cylindrical body It is possible to determine whether the wall thickness at multiple locations falls within the set value.
The gist of this is to perform accurate measurements without manual intervention as in the past.

The present invention also provides a wall thickness measuring device for a flexible cylindrical body that measures and inspects the wall thickness of a flexible cylindrical body of a predetermined length at multiple points, the device comprising: A cylindrical jig to be attached is rotatably installed via a turning mechanism, and a slide base that can be approached and separated is provided on the outer periphery of the cylindrical jig. A control device that is equipped with a plurality of measuring means that can come into contact with a location, and that performs computation for correcting the measured value measured by the measuring means by the jig, and further performs comparison calculation with preset upper and lower limit set values. Since it is connected to the system, there is no need to perform measurement work manually, which improves work efficiency, reduces measurement time, and also reduces costs because no complicated mechanism is used. The main point is that it can be manufactured.

[Embodiments of the invention]

The present invention will be described in detail below based on the accompanying drawings.

FIG. 1 shows a front view of a wall thickness measuring device for measuring the wall thickness t of a flexible cylindrical body W such as a rubber cylinder used in conjunction with a vehicle damper, etc. Figure 1~
As shown in FIG. 3, a cylindrical jig 10 into which a flexible cylindrical body W formed into a tapered cylindrical shape is fitted and attached, a turning mechanism 11 that rotatably supports this cylindrical jig 10, and a rotating mechanism 11 that rotatably supports the cylindrical jig 10; Slide base 1 that can be freely approached and moved away from the outer circumference of jig 0
2, a plurality of measurement means 13 brought into contact with the slide base 12 at a plurality of locations on the outer peripheral surface of the flexible cylindrical body, and a control device 14 connected to each of the measurement means 13,
This control device 14 compares and calculates the measured value measured by the measuring means 13, the jig correction value measured only with the initial jig, and the upper and lower limit set values set in advance. This is to determine whether or not the wall thickness t at several locations falls within a set value.

The cylindrical jig lO is formed to have a slightly smaller diameter (approximately 0.5 mm to 2 mm) than the inner diameter of the flexible cylindrical body W, and is erected on the center jig 16 built into the turning table 15. The upper end of the supporting rod 17 is inserted into the nut 1.
8.

The turning mechanism 11 includes a worm gear 20 for turning the turning table 15 inside a circular table 19, and a gear 23 provided on a drive shaft 22 of a motor 21 meshes with this spur gear 20. , is configured to rotate the cylindrical jig 10 at a predetermined speed.

Several locations on the outer periphery of the cylindrical jig 10 (in this example, 90
The slide base 12, which can be freely approached and separated from the slide base 12, is attached to a support plate 24 and is slidably supported via a slide bearing 27 on a slide shaft 26, which is supported via a block bearing 25. This slide base 12 includes an air cylinder 280 and a rod 29 with a position sensor fixed to the side of the support plate 24.
is connected via a connecting rod 30 to the tip.

A height adjustment rail 31 is provided on the side surface of the slide base 12 in the vertical direction, and linear gauges are installed at several locations on the height adjustment rail 31 (two locations on the left side and three locations on the right side in FIG. 1). A measuring means 13 such as the above is attached.

The measuring means 3 attaches a lock bolt 3 to the tip of the plate 32.
3, the angle can be adjusted freely, and this plate 3
2 is attached to the height adjustment rail 31 via a lock bolt 34 so that its position can be adjusted.

A rod-shaped detector 13a is attached to the tip of the measuring means 13 so as to be extendable and retractable.

Each of the measuring means 13 described above includes a control circuit 3 as shown in FIG.
5 to the control device 14.

In the control circuit 35, a counter 36 for measuring a detected value is connected to each measuring means 13, and each counter 36 outputs the measured value to the control device 14.

The electrical output of the values measured by each measuring means 13 is input to the control device 14 via a counter 36, and the control device 14 performs measurement calculation storage and data processing.

In addition, FIG. 4 is a schematic diagram of the measuring device of FIG. 1, each mechanism is represented diagrammatically, and the reference numerals in FIG. 1 indicate the same components.

Next, a method for measuring wall thickness will be explained.

First, each measurement point of the cylindrical jig 10 (for example, point A, point B, point 0, point D, point E in 4 locations on the circumference in FIG.
That is, the deviation of the zero point at 90 degree intervals is measured by the measuring means 13 and stored in the control device 14.

Next, the flexible cylindrical body W is fitted and attached to the rotatable cylindrical jig 10 via the turning mechanism 11, and the flexible cylindrical body 10 is fitted at multiple points A point, B point, Point C, Point D, E
A plurality of measuring means 1 arranged around a cylindrical jig 10 at a point
3 is advanced through the air cylinder 28 to actually measure the wall thickness at five points. Then, the rotation mechanism 11
The same measurements were taken four times in total by rotating the robot every degree, making a total of 20 measurements.

Then, this measured value is input to the control device 14, and the measured value is made to correspond to the measured value of the outer circumferential surface of each cylindrical jig measured in advance, and then the value of the deviation at the 0 point is subtracted and corrected, and the data is processed using this as the true value.

Furthermore, by performing comparison calculation processing with upper and lower limit set values input in advance, it is determined whether the wall thickness t at a plurality of locations of the flexible cylindrical body W falls within the set value.

Note that the required accuracy of the wall thickness t of the flexible cylindrical body W can be measured with the above-mentioned device to within 10 μm.

〔Effect of the invention〕

The present invention is a method for measuring the thickness of a flexible cylindrical body, which measures and inspects the wall thickness of a flexible cylindrical body of a predetermined length at multiple points as described above, the method comprising: It is attached to a rotatable cylindrical jig via a turning mechanism, and a plurality of measuring means arranged around the cylindrical jig are moved forward to measure the wall thickness at multiple locations on the outer peripheral surface of this flexible cylinder. By inputting this measured value into the control device and comparing the subtraction correction value with the measured value of the outer peripheral surface of the cylindrical jig and the upper and lower set values, multiple flexible cylindrical bodies can be Since it is possible to determine whether or not the wall thickness at a location falls within the set value, there is an effect that accurate measurement can be performed without manual intervention as in the conventional method.

Further, there is provided a wall thickness measuring device for a flexible cylindrical body that measures and inspects the wall thickness of a flexible cylindrical body of a predetermined length at multiple points,
A cylindrical jig to which the flexible cylindrical body is fitted and attached is rotatably installed via a turning mechanism, and a slide base that can be approached and separated is provided on the outer periphery of the cylindrical jig, and this slide base A plurality of measuring means that can come into contact with a plurality of locations on the outer circumferential surface of the flexible cylindrical body are arranged, and each measuring means is compared and calculated with a measured value measured by the measuring means and a preset setting value. Since it is configured by connecting to a control device, there is no need to perform measurement work manually, which improves work efficiency, reduces measurement time, and eliminates the need for complicated mechanisms. It has the effect of being able to be manufactured at low cost.

[Brief Description of the Drawings] Fig. 1 is a front view of a wall thickness measuring device embodying the present invention, Fig. 2 is a plan view taken along the nn arrow in Fig. 1, and Fig. 3 is a measuring means shown in Fig. 2. Fig. 4 is an explanatory diagram of the control circuit, Fig. 5 is an operating state diagram of
The figure is an explanatory view showing how a conventional flexible cylindrical body is used. 10...Cylindrical jig, 11...Swivel mechanism, 12...
Slide base, 13...Measuring means, 14...Control device, W...Flexible cylindrical body, t...Wall thickness.

Claims (1)

[Scope of Claims] 1. A method for measuring the thickness of a flexible cylindrical body of a predetermined length at multiple points, the method comprising: It is attached to a rotatable cylindrical jig via a turning mechanism, and a plurality of measuring means arranged around the cylindrical jig are moved forward to measure the wall thickness at multiple locations on the outer peripheral surface of this flexible cylinder. is actually measured, inputs this measured value to the control device, and compares and calculates the subtraction correction value of the measured value of the outer peripheral surface of the cylindrical jig with the upper and lower limit set values. A method for measuring the wall thickness of a flexible cylindrical body, the method comprising determining whether the wall thickness at a location falls within a set value. 2. A wall thickness measuring device for a flexible cylindrical body that measures and inspects the wall thickness of a flexible cylindrical body of a predetermined length at multiple points, the cylindrical jig to which the flexible cylindrical body is fitted and attached. A tool is rotatably installed via a turning mechanism, and on the outer periphery of the cylindrical jig,
A slide base that can approach and move away is provided, and a plurality of measuring means that can come into contact with a plurality of locations on the outer circumferential surface of the flexible cylindrical body are arranged on this slide base, and each measuring means is
A wall thickness measuring device for a flexible cylindrical body, characterized in that it is connected to a control device that performs jig correction calculations on measured values measured by a measuring means, and further performs comparison calculations with preset upper and lower limit set values. .