1. De-oxidizer

Oxide requirements in the mandrel pre-piercing in a molten state. Its strength and other strict requirements.

(1) In addition to the oxidizer powder particle size is generally required to be about 16 mesh.

(2) The content of sodium stearate in the de-oxidizing agent should be more than 12% in order to enable it to burn fully in the inner cavity of the capillary.

(3) According to the inner surface area of the capillary to determine the spray volume of de-oxidizing agent, generally 1.5-2.0g/dm2, different diameters, lengths of the capillary blowing de-oxidizing dose is different.

2. blowing process parameters

(1) blowing pressure should be matched with the diameter and length of the capillary, not only to ensure that the blowing is strong, full combustion, but also can not have incomplete combustion of the de-oxidizing agent is blown away by the airflow from the capillary.

(2) Blowing time should be adjusted according to the direct length of the capillary, in order to have no suspended metal oxides in the capillary and then blown out as a standard.

(3) The nozzle height should be adjusted according to the diameter of the capillary to ensure good alignment. The nozzle should be cleaned once per shift, and the nozzle should be removed for cleaning after a long shutdown. In order to ensure that the de-oxidizing agent in the inner wall of the capillary uniform blowing, in the blowing de-oxidizing agent station using optional devices, and with rotary air pressure.

3. Mandrel lubrication

Mandrel lubrication effect is not good or mandrel lubricant temperature is too low, will produce internal scarring. In order to improve the mandrel temperature, can take only one cooling water cooling method. The production process requires strict control of the mandrel temperature, to ensure that the surface temperature of the mandrel before spraying lubricant in 80-120 ℃, the mandrel temperature can not be higher than 120 ℃ for a long time in order to ensure that the lubricant on the surface of the pre-penetration before the lubricant is dry and dense, the operator should always check the status of the mandrel lubrication.