XNUMX가지 일반적인 담금질 방법 요약 고주파 담금질 기계 (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. 이중 중간 담금질

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

마르텐사이트 등급 담금질: 강철을 오스테나이트화한 다음 강철의 상부 마르텐스점보다 약간 높거나 낮은 온도의 액체 매질(염욕 또는 알칼리욕)에 담그고 적절한 시간 동안 유지하고 내부 및 외부 강철의 일부가 처리됩니다. 층이 중간 온도에 도달 한 후 공랭을 위해 꺼내고 과냉각 된 오스테 나이트는 천천히 마르텐 사이트의 담금질 과정으로 변형됩니다. 복잡한 모양과 엄격한 변형 요구 사항이 있는 작은 공작물에 일반적으로 사용되며 고속 강철 및 고합금 강철 도구 및 다이도 일반적으로 이 방법으로 담금질됩니다.

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;