What aspects should be paid attention to when designing the quenching cooling medium pipeline?

(1) Kapasitas tangki Kapasitas tangki mirip dengan tangki air pendingin, tetapi ketika tangki media pendingin pendinginan terintegrasi dengan mekanisme pengangkatan mekanis alat mesin, karena pipa yang lebih pendek, dapat dirancang lebih kecil agar untuk mengurangi volume tempat tidur untuk memenuhi pompa air pendinginan Pasokan daur ulang baik-baik saja.

(2) Pasokan media pendinginan pendinginan Pasokan media pendinginan pendinginan terkait dengan laju aliran pompa air pendinginan, dan laju aliran ini tergantung pada luas permukaan pendinginan utama benda kerja dan kerapatan semprotan yang diperlukan [mL/ (cm2s )], yaitu per luas sentimeter persegi Jumlah air yang disemprotkan per detik (mL). Kepadatan semprotan bahan baja yang berbeda dan metode pemanasan yang berbeda ditunjukkan pada tabel. Beberapa pabrik Jepang menggunakan 20~30mL/ (cm2s).

Table 8-6 Recommended value of spray density of quenching cooling medium

Kategori Kepadatan semprotan/ [mL/ (cm2s)]

Pengerasan permukaan umum 10-15

Pendinginan diatermik 40 ~ 50

Low hardenability steel quenching 60 ~ 100

(3) The size of the filter mesh of the quenching liquid is a function of the spray aperture. The diameter of ordinary fiber or iron powder is often between 70~100pim. The smaller the spray aperture, the finer the filter screen is required, and the spray aperture is general. Not less than 1mm, so the aperture of the filter screen is required to be less than 1 mm. In actual production, 0.3~0.8mm is used. If the filter screen is too small, the resistance will be increased, and the channel area will also decrease under a certain pipe diameter.

(4) The number of spray holes Regarding the number of spray holes on the effective circle of the sensor, it is generally specified as 3 ~ 4/cm2, and the holes should not be too dense. Due to the large or small pore diameter, some materials recommend that the cross-sectional area of ​​the spray hole on the effective ring should be less than 15% of the quenching surface area and greater than 5% of the quenching surface area.

(5) The area of ​​the nozzle inlet pipe The ratio of the total cross-sectional area of ​​the nozzle inlet pipe to the total cross-sectional area of ​​the spray hole should be 1:1 as much as possible. When the quenching water pump pressure is large enough (such as 0.4 MPa or more), it can be Change this ratio, but it is better not to exceed 1:2.

(6) Tekanan semprotan Umumnya, ketika tekanan semprotan 0.1MPa, baja struktural karbon sedang dapat dikeraskan. Namun, telah ditemukan dalam praktik bahwa semakin besar tekanan semprotan, semakin signifikan efek gerusan skala oksida tipis pada permukaan. Untuk benda kerja yang rentan terhadap pendinginan dan retak, tekanan semprot harus dipertimbangkan dengan cermat.