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Titanium Valve Parts In The Production Of The Correct Choice Of Pouring Temperature!
Sep 06, 2017

Titanium Valve Parts in the production of the correct choice of pouring temperature!
We believe that keeping the cup is full of the best possible level of pouring. If the casting system is poorly designed, the molten iron can not flow into the mold in time, resulting in the completion of pouring at the specified time. If the casting system is designed too large, Titanium Valve Parts the molten iron can not fill the gate cup, resulting in oxidized slag, molding sand and gas directly into the mold , Caused by sand, slag, porosity defects.
Casting plant in the production of titanium parts in the correct choice of casting temperature
1, Titanium Valve Parts pouring temperature is too high will greatly improve the proportion of waste
Pouring temperature is too high will cause the sand rose, especially with a complex sand core gray cast iron pieces, when the pouring temperature ≥ 1420 ℃ when the waste increased, pouring temperature of 1460 ℃ when the waste up to 50%. In the production, the use of induction furnace melting can better control the temperature of molten iron.
2, pouring temperature is too low may be the formation of defects
(1) Manganese sulfide stomata This stomata is located in the gray cast iron under the epidermis and more in the above, often exposed after processing, stomatal diameter of about 2 ~ 6mm. Titanium Valve Parts Sometimes the pores contain a small amount of slag, metallographic studies show that this defect is MnS segregation and slag mixing, because the pouring temperature is low, while the molten iron containing Mn and S high.
This amount of S containing and the appropriate amount of Mn (0.5% ~ 0.65%), can significantly improve the purity of molten iron, Titanium Valve Parts which effectively prevent such defects.
(2) Titanium Valve Parts sand core gas caused by the pores and porous air holes often due to poor sand core caused by exhaust. Because the core when the sand core in the core box in the hardening, which often makes the sand core exhaust number is not enough. In order to form the exhaust hole, Titanium Valve Parts the core can be added after drilling hardening.
(3) liquid slag processing gray cast iron under the skin will find a single hole, the hole diameter is generally 1 ~ 3mm. In some cases there are only 1 to 2 holes. Metallographic studies have shown that these pores appear with a small amount of liquid slag, but no segregation of S is found. Studies have shown that this defect is related to the pouring temperature, casting temperature is higher than 1380 ℃, Titanium Valve Parts found no such defects, so the casting temperature should be controlled at 1380-1420 ℃. It is worth mentioning that the design of the gating system is changed and the defect can not be eliminated. Therefore, such defects can be considered to be due to the low pouring temperature and the pouring of molten iron in a trace reducing atmosphere.
The most common cause of pouring temperature is that before pouring, the molten iron is transported and stopped for a long time in the open ladle. With a ladle cover with a thermal insulation material, the heat loss can be significantly reduced.
Titanium Valve Parts of the advantages of the following points:
1. Greater design flexibility
This design has the greatest freedom of choice with the shape and size of the Titanium Valve Parts, especially the complex shapes and hollow parts, and the Titanium Valve Parts can be manufactured by the unique process of the core Titanium Valve Parts. Easy to shape and easy to change shape and can quickly produce drawings according to the drawings can provide rapid response and shorten the delivery time.
2. Metallurgical manufacturing The strongest flexibility and variability
You can choose a different chemical composition and organizational structure to meet the needs of different projects. Different heat treatment processes can select mechanical properties and can use this property over a wide range and improve solderability and usability.
3. Improve the overall structural strength
Due to the high reliability of the project, coupled with weight loss design and shorter lead times, it can improve the competitive advantage in terms of price and economy.
4. A wide range of weight changes
Small Titanium Valve Parts may have only 10 grams, and large Titanium Valve Parts up to several tons, dozens or even hundreds of tons.