Muhtasari wa njia kumi za kawaida za kuzima mashine ya kuzima masafa ya juu (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. Kuzima mara mbili kati

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

Uzimaji wa daraja la Martensitic: Chuma huimarishwa, na kisha kuzamishwa kwenye chombo cha kioevu (bafu ya chumvi au umwagaji wa alkali) na joto la juu kidogo au chini kuliko sehemu ya juu ya chuma ya Martens, iliyohifadhiwa kwa muda ufaao, na ya ndani na nje. sehemu za chuma zinatibiwa. Baada ya safu kufikia joto la kati, inachukuliwa nje kwa ajili ya baridi ya hewa, na austenite ya supercooled inabadilishwa polepole kuwa mchakato wa kuzima wa martensite. Kwa ujumla hutumiwa kwa vifaa vidogo vya kazi vilivyo na maumbo magumu na mahitaji madhubuti ya deformation, na chuma cha kasi na zana za chuma za aloi ya juu na kufa pia huzimishwa kwa njia hii.

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;