Our company is enterprising manufacture,supply and export of graphite products.

Zhengnai Industry co., LTD

RP|HP|SHP|UHP|Graphite Electrode Suplier

+86 19903830057zhengnaishiye@gmail.com

Location:HOME > BLOGS >

Reasons for green cooling

Release time:2019-12-11 From: Zhengnai Industry in China

Reasons for green cooling in graphite electrode

The green body just leaving the extrusion nozzle maintains a high temperature, cuts to the required length, and is immersed in cold water to prevent the green body from being deformed.

Vibration molding machine in graphite electrode

The vibration molding machine is composed of a vibration table, a weight or an upper hydraulic device and a mold.

High frequency during vibration molding

The molding die fixed on the vibrating table during vibration molding and the paste contained in the mold are in a state of strong vibration, although the amplitude is not large but the frequency is high.

Vibration molding principle

Vibration molding relies mainly on "vibration compaction" rather than "pressure compaction."

Factors affecting the quality of vibration molded products

Vibration molding has its own unique process rule. The quality of the vibration molded product is affected by several factors such as the frequency and amplitude of the vibration table, the vibration time and the upper surface contact specific pressure. It is also related to the binder amount and temperature of the paste.

Relationship between excitement and amplitude

  • 1. When the vibration frequency is constant, the inertial force of the vibrated object changes with the amplitude, that is, the greater the amplitude, the greater the excitability required.
  • 2. When the higher frequency is selected, the amplitude can be appropriately reduced.
  • 3. In the amplitude In the case where the frequency is relatively fixed, the excitability required for the vibrating table depends mainly on the total weight of the material to be vibrated.

Exciting vibration table for large-size products

For the production of large-size products, the vibration table with more excitement should be selected to ensure the quality of the vibrating green body.

Item Unit HP
Electric resistivity Electrode μΩm 5.8-6.6
Nipple 4.2-5.0
Flexural strength Electrode Mpa 10.0-13.0
Nipple 18.0-22.0
Elastic modulus Electrode Gpa 8.0-12.0
Nipple 14.0-16.0
Bulk density Electrode ≥g/cm3 1.62-1.66
Nipple 1.74-1.80
CTE(100-600℃) Electrode x10-6/℃ 1.6-1.9
Nipple 1.1-1.4
Ash   0.3

Vibration time selection

The vibration time refers to the time when the heavy hammer (or hydraulic device) contacts the material surface after loading, the large-size product should vibrate for 6-10min, and the medium-sized product should vibrate for 5-8min.