दस सामान्य शमन विधियों का सारांश उच्च आवृत्ति शमन मशीन (1)

1. Single medium (water, oil, air) quenching

Single medium (water, oil, air) quenching: Quenching the workpiece that has been heated to the quenching temperature into a quenching medium to cool it completely. This is a simpler quenching method and is often used for carbon and alloy steel workpieces with simple shapes. The quenching medium is selected according to the heat transfer coefficient, hardenability, size and shape of the parts.

2. डबल मध्यम शमन

Dual-medium quenching: The workpiece heated to the quenching temperature is first cooled to the Ms point in the quenching medium of a high-frequency heating machine with strong cooling capacity, and then transferred to the slow-cooling quenching medium to cool to room temperature to achieve different quenching cooling temperatures range, and has an ideal quenching cooling rate. It is used for complex shapes or large workpieces made of high carbon steel and alloy steel, and carbon tool steel is also mostly used in this method. Commonly used cooling media are water-oil, water-nitrate, water-air, oil-air. Generally, water is used as a quick-cooling quenching medium, oil or air is used as a slow-cooling quenching medium, and air is less used.

3. Martensite graded quenching

मार्टेंसिटिक ग्रेडेड क्वेंचिंग: स्टील को ऑस्टेनिटाइज़ किया जाता है, और फिर एक तरल माध्यम (नमक स्नान या क्षार स्नान) में डुबोया जाता है, जिसका तापमान स्टील के ऊपरी मार्टेंस पॉइंट से थोड़ा अधिक या कम होता है, जिसे उचित समय के लिए रखा जाता है, और आंतरिक और बाहरी स्टील के कुछ हिस्सों का इलाज किया जाता है। परत मध्यम तापमान तक पहुंचने के बाद, इसे एयर कूलिंग के लिए बाहर निकाला जाता है, और सुपरकूल्ड ऑस्टेनाइट धीरे-धीरे मार्टेंसाइट की शमन प्रक्रिया में बदल जाता है। यह आम तौर पर जटिल आकार और सख्त विरूपण आवश्यकताओं वाले छोटे वर्कपीस के लिए उपयोग किया जाता है, और उच्च गति वाले स्टील और उच्च मिश्र धातु इस्पात उपकरण और मर भी आमतौर पर इस विधि से बुझ जाते हैं।

4. Martensite graded quenching method below Ms point

Martensitic graded quenching method below Ms point: When the bath temperature is lower than the Ms of the workpiece steel and higher than Mf, the workpiece cools faster in the bath, and the same result as the graded quenching can be obtained when the size is larger. Commonly used for larger size low hardenability steel workpieces.

5. Bainite isothermal quenching method

Bainite isothermal quenching method: The workpiece is quenched into a bath with the lower bainite temperature of the steel at an isothermal temperature, so that the lower bainite transformation occurs. Generally, it is kept in the bath for 30~60min. There are three main steps in the bainite isothermal quenching process: ① austenitizing treatment; ② cooling treatment after austenitizing;