JPS5818144A - Method and apparatus for measurement of hardness of elastomer article - Google Patents

Abstract

PURPOSE:To make an effective and accurate comparison of hardness of the plural elastomer articles, by correcting and computing the hardness at a reference temperature basing on the temperature in the vicinity of a measuring point. CONSTITUTION:A hardness H' measured by a hardness sensor 4 and a conversion part 7 to numerical value, etc. is displayed on a hardness display part 10 and at the same time, it is inputted to a correction operation part 9. On one hand, a temperature T measured by a temperature sensor 5 placed near a hardness measuring point is inputted to an operation part 9 also. Further, the correction operation basing on expressionIis carried out by the part 9 in accordance with the input and a hardness H at a reference temperature of 20 deg.C, etc. of normal temperature is determined and is displayed on a hardness digital display part 6 after correction. An effective and accurate comparison of the hardness of the plural elastomer articles is made by the hardness at this standard temperature. In the expressionI, (a) is a constant determined by the article to be measured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring the hardness of elastomer articles such as tires and fenders, and an apparatus used for the measurement.

Conventionally, when measuring the hardness of this type of article, temperature is often ignored and only the hardness is measured. However, the hardness of this type of article often changes significantly when the temperature changes.
Therefore, when comparing articles based on hardness measured while ignoring temperature, accurate judgment cannot be made.

In addition, when it was necessary to measure hardness at a constant temperature, measurements were also carried out by heating the test piece to a predetermined temperature with an open test piece. It was impossible to carry out in cases where it could not be removed.

An object of the present invention is to provide a hardness measuring method for measuring the hardness of an elastomer article at a given temperature to obtain the hardness at a reference temperature, and an apparatus for use in the method.

The present invention will be explained below based on one embodiment shown in the drawings. In FIGS. 1 and 2, reference numeral 1 denotes a sensor support body, which is formed into a small box shape. The bottom surface of the sensor support 1 is formed with a fixed support part 2 that comes into contact with the object to be measured, and a sensor support surface 3. A hardness sensor 4 is protruded from the center of the sensor support surface 3, and a hardness sensor 4 is protruded from the center of the sensor support surface 3. A temperature sensor 5 is provided at. A digital display section is provided on the front side of the main body 1 and serves as a hardness display section 6. The hardness display section 6 is composed of an LED, a liquid crystal, or the like.

Inside the sensor support unit are shown in the block diagram in Figure 3.
A digitization unit 7.8 that digitizes each electric signal from the sea urchin hardness sensor 4 and temperature sensor 5, and calculates the hardness at a predetermined reference temperature, for example, 20°C, based on the signals from the digitization unit. It has a built-in correction calculation section 9. @The value converting section 7.8 is composed of a counter circuit or an A-D converter, and the arithmetic section 9 is composed of a logic circuit or a microcomputer. In the calculation unit 9, for example, 20'C is calculated based on the measured hardness H' and the measured temperature T.
The hardness H can be calculated according to the following formula % formula % (1), and the result is digitally displayed on the hardness display section 6. In equation (2), a is a coefficient determined by the article to be measured, and is a numerical value such as 3.5, for example.

In the hardness measuring device configured in this way, when the user grasps a suitable position on the outer surface of the sensor support 1 and presses the fixed support 2 against the surface of the object to be measured, the hardness sensor 4 is pushed in and the temperature sensor is 5 comes into contact with the object to be measured, hardness and temperature are measured at the same time, and the calculation result according to the equation (2) is digitally displayed on the display section 6.

As mentioned above, the hardness at a desired position of the elastomer article and the temperature at the hardness measurement position are simultaneously measured, and a correction formula obtained in advance for the article to be measured is calculated based on the measured hardness and temperature. From this, the hardness at the reference temperature is calculated [σ], and even if there are a plurality of fAIJ constant articles and each of them has a different temperature, the hardness can be immediately compared. Further, even in cases where the temperature of the article to be measured cannot be determined to a predetermined value due to its size or C-shaped shell, the hardness at the predetermined temperature can be virtually determined by MU. For example, if you want to know the hardness of a tire mounted on a car at a predetermined temperature after driving, you can leave the tire still mounted on the car. In addition, in tire running tests, etc., [when using the above device, the hardness that displays the value as it is actually measured as shown in Figures 1 and 3 G, α line] Display section 10. In the above embodiment, the temperature sensor 5G is positioned immediately next to the hardness sensor 4. , the temperature sensor 5 may be provided using the fixed support portion 2 as a sensor support surface.

Further, although equation (1) in the above embodiment is an example of linear approximation, quadratic curve approximation, exponential curve approximation, etc. can be similarly implemented. Further, although the reference temperature in the example was 20°C, in some cases, any necessary temperature may be set using the numeric keys, and the hardness corresponding to that temperature may be calculated. Of course.

Further, in the above embodiment, the sensor support 1 is provided with the numerical conversion section 7.8, the correction calculation section 9, the display section 6, etc., but depending on the case, these may be provided on a separate main body and the sensor According to the present invention, the hardness and temperature of the elastomer article are simultaneously measured and the hardness at the reference temperature is calculated. It is possible to provide a hardness measuring method and measuring device that are extremely effective for comparing the hardness of a plurality of elastomer articles.

[Brief explanation of the drawing]

Fig. 1 is a schematic front view of a sensor support according to an embodiment of the present invention, Fig. 2 is a schematic bottom view of the embodiment, Fig. 3 is a block diagram showing the overall configuration of the embodiment, and Fig. 4. 5 is a schematic front view of a sensor support of another embodiment, and FIG. 5 is a bottom view corresponding to FIG. 4. U...Sensor support body, 2...Fixed support part, 3...
Sensor support surface, 4... Hardness sensor, 5... Temperature sensor, 6... Hardness digital R bearing part after correction, 7.8...
Numerical conversion section, 9... Correction calculation section. Patent applicant: Sumitomo Rubber Industries, Ltd. Representative: Satoshi Shimizu and 2 other members
Figure blue. Figure v2 Figure YaS diagram

Claims (2)

[Claims] (1) The hardness of the desired position of the elastomer article and the temperature at or near the hardness measurement position are simultaneously measured, and a reference temperature is determined using a correction formula previously obtained for the article based on the measured hardness and temperature. A method for measuring the hardness of an elastomer article to calculate the hardness of the article. (2) The sensor support has a sensor support surface that faces the hardness measurement position of the article whose hardness is to be measured, a hardness sensor is protruded from the sensor support surface, and the sensor support surface or the vicinity of the hardness sensor is fixed. A temperature sensor is installed on the support part,
A digitization unit that digitizes the output signals from the hardness sensor and the temperature sensor, and a correction operation that receives the digitized signals and calculates the hardness at a reference temperature from the measured temperature of the article and the hardness at that temperature. and a hardness display section for displaying the corrected hardness of the article, fIt,) (3)
The hardness measuring device for an elastomer article according to claim 2, wherein the sensor support is provided with each of the numerical conversion sections, the correction calculation section, and the display section.