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■■■■■■■■■■■■■■■■■■■ 川崎製鉄技報 KAWASAKI STEEL GIHO Vol.3 (1971) No.3 ■■■■■■■■■■■■■■■■■■■ |
| 超音波硬さ計ソノハードSH-1型について Ultrasonic Hardness Tester SONOHARD Model SH-1 石橋 久左衛門(Kyuzaemon Ishibashi) 安藤 昌司(Shoji Ando) 橋本 徹雄(Tetsuo Hashimoto) |
| 要旨 : 超音波硬さ計SONOHARD SH-1型は圧子の押込み深さを超音波振動により測定するもので，硬さ値は電流計に直接指示される。圧子部をプローブと指示計を含む本体よりなり，硬さ範囲はHRC 20〜70，圧子はビッカース型ダイヤモンド圧子で用い，荷重は約1kgをバネで与えられる。したがって，プローブを下向きだけでなく，横，上向きにでも当てて測定することができ，小型軽量（5.5kg）な本体と相まって現場での使用に便利である。また硬さ値が電気的な信号で得られるので，硬さ測定の自動化，オンライン化も期待できる。 |
| Synopsis : The ultrasonic hardness tester SONOHARD Model SH-1 is designed for measuring the material hardness electrically by making an indentation on an object, and reading the hardness value indicated on the calibrated ammeter which is sensitive to the changes in hardness caused by such indentation. SONOHARD consists of a manual probe and a hardness indicator. The manual probe contains a Vickers diamond-tipped rod assembly vibrating at ultrasonic frequencies. The standard instrument is calibrated for steel in Rockwell c units 20-70, and its scale is linearized. The total load on the indenter is usually approximately 900 grams, and a precise coil spring insures the constancy of the load in use. As SONOHARD probe is extremely light and can be easily handled by one hand, this tester can measure quickly the hardness of any heavy steel objects by simply applying the probe from any positions, vertical, horizontal or overhead. Moreover, since the indicator itself is designed as a portable type, SONOHARD is convenient for workshop testing purposes. As the hardness value is detected as an electric signal, this instrument will make it possible to automate the hardness testing and put it on the on-line system. |
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