ningbo parfect precision casting factory is a formal precision casting foundry , in many consumers' reputation is very good. The production of ningbo precision casting, both the specifications and prices are very appropriate. Today, parfect to introduce is about the reasons for the formation of ningbo precision casting pores and solutions.
For ningbo precision casting, porosity is one of the common defects of precision casting, which means that there are some defects in the precision castings. Stomata are usually found after machining. Department of precision casting technicians with many years of experience in production, causes and prevention methods of stomata appeared in precision casting are summarized as follows: 1 causes: 1 pores in most cases is mainly because of precision casting shell roasting is not sufficient, pouring molten steel shell for the moment a large amount of gas can not be discharged smoothly, and then invaded the pores the formation of liquid metal; 2 for shell making or shell material, shell permeability is poor, difficult to discharge the gas in the cavity, pore forming into the molten metal pouring molten steel; 3 involved in air to discharge to cause the blowhole. Two, prevention method: in the case of precision casting conditions, in the complex structure of the highest place to set the exhaust hole of the casting 1. 2 in the design of the gating system, to take into account the needs of the shell exhaust. 3 shell roasting temperature, time to be reasonable, heat preservation time should be sufficient. 4 wax removal should be completely removed. 5 properly reduce the distance between the ladle nozzle and the sprue cup, the pouring speed should be uniform, so as to ensure that the steel is stable and filled the cavity, as little as possible into the air in the molten steel, so that the gas in the cavity and the molten steel can be discharged smoothly.
|
Author : steve fay |
Views : 36 |
|
|
|
|
This Blog Has Been PowerShared™ Successfully! |
|
|
Check out Steve fay's Profile, and Blogs! |
|