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In The Valve Castings In The Preparation Work
- Jun 09, 2017 -

In order to ensure the smooth production of valve castings to ensure the quality of cast products meet customer requirements, in the casting work before, have to carry out a series of preparatory work, before the start of the inspection work is essential. In the valve castings should do the following several preparations:

1, temperature control (to the temperature of the pouring process to determine the insulation furnace, in addition to the air box, filter tank and casting the front of the temperature control)

2, aluminum liquid pouring process in the interface, the accident flow of the seal and the accident box in place, capacity and dry conditions;

3, transfer flow tank, casting flow tank, funnel (distribution bag), control raft, slag box and tool heating and drying;

4, casting transmission control system, including hydraulic, instrument operation and display;

5, the degree of smoothness of the mold, the location of the placement and the location of the ingot and dry conditions (including lubrication);

6, the cooling water debugging and water temperature situation;

7, the production of alloy, the specifications of the process parameters to confirm, etc., these are each casting can not ignore the work.

In addition to some of the valve castings preparation but also targeted, according to the production of the alloy, specifications and previous production, quality problems, targeted to take the necessary measures to ensure the smooth casting process, product quality. Similarly, to carry out other types of casting work before, but also to carry out the corresponding inspection work.

In order to improve the tensile strength of the valve castings, should use a lower carbon equivalent, the valve castings carbon content of mostly 2.6% to 3.6%, silicon content of 1.2% to 33.0%.

According to the castings wall thickness as far as possible to take the lower limit, the appropriate increase in the content of manganese, the general valve castings manganese content of 0.4% to 1.2%, castings do not appear in the case of white mouth to take the upper limit.

In addition, alloying methods can also be used to improve the tensile strength of castings, the appropriate addition of trace alloys such as: chromium, molybdenum, tin and other elements can also significantly improve the tensile strength of gray cast iron.

At the same time to do with the hot metal processing.