12 Inch 600LB WCC Gate Valve Body Casting

Product Introduction

valve casting use parameters

Working temperature: -196°C—650°C

Pressure rating: 150Lb—4500Lb

Valve diameter: 50mm—1300mm(2″—50″)

Maximum single piece weight: 6 tons

Casting process design of Gate Valve Casting

Correct and effective control of casting solidification is the first important condition for obtaining high-quality steel castings. Correct process measures such as: gating system, riser and cold iron, process correction amount, etc. are taken to form a reasonable process plan. Due to the uneven wall thickness of valve steel castings, the principle of sequential cooling and sequential solidification should be adopted to reduce defects such as stress, shrinkage cavity and shrinkage porosity inside the casting.

It has 5T intermediate frequency melting furnace, 2.5T intermediate frequency melting furnace, 0.75T intermediate frequency melting furnace and other melting equipment to meet the melting needs of various materials

The quenching pool with a stirring system can make the liquid in the entire quenching work area flow continuously to ensure uniform temperature in the quenching work area, and can also quickly take away the heat of the quenched workpiece when the quenched workpiece enters the quenching work area, so as to achieve the purpose of rapid and uniform quenching , greatly reducing the defective rate of castings

The heat treatment furnace can meet the requirements of heating, normalizing, quenching and tempering, quenching, solid melting, annealing and heat treatment of various steel castings. The advanced combustion control system enables the heat energy to circulate and convect heat in the furnace, which improves the furnace temperature uniformity and heat transfer efficiency, thereby improving the heating quality.

The resin sand processing production line is designed and equipped with vibration shakeout, sand crushing, roasting regeneration, fine powder separation, sand temperature control and automatic conveying, ventilation and dust removal, and automatic control, which can effectively improve the quality of castings, reduce casting pores and cracks, and improve automation capabilities.

The core drying furnace is specially designed and manufactured for the foundry industry to dry the water-based paint on the surface of the resin sand core. The sand surface drying furnace has high heat utilization rate, stable and uniform temperature, large production batch and high degree of automation.

Nine-point temperature-controlled heat treatment kiln, low-temperature steel treatment quenching pool, stainless steel pickling and passivation line, cobalt-60 flaw detection room, a full set of model making equipment and mechanical processing equipment

 Technological measures to control the sequential solidification of steel castings

1) Design a reasonable parting position, pouring position and pouring system.

2) The riser is designed at the final solidified part of the casting. While playing the role of feeding, it also delays the solidification of molten steel around the riser, resulting in sequential solidification conditions.

3) During the pouring operation, when the molten steel rises to 1/4 of the height of the riser, pour from the top of the riser instead, which can increase the pressure head of the molten steel and increase the temperature of the riser.

4) Determination of cast steel riser size: the methods include modulus method (determined according to the heat capacity of the casting); volume shrinkage method (determined according to the solidification shrinkage rate of molten steel); ratio method (determined according to the feeding type of the casting) and heat section Circle method (determined according to the thermal pitch circle of the casting). At present, in order to meet the convenient design requirements in the factory, the hot knot circle method is commonly used to determine the size of the riser.

5) Selection of casting shrinkage rate: During the process of solidification and cooling, the volume and size of steel castings will shrink and decrease, and the shrinkage from liquid solidification to solid is generally expressed by the change in length–linear shrinkage ( %).

gate valve castings material

There are many factors that affect the casting shrinkage rate. When the casting shrinks in the mold in the solid state, it is also affected by external resistance, which will reduce the actual shrinkage. At this time, it is called non-free shrinkage, and the non-free shrinkage rate is always smaller than free shrinkage. Rate. Factors affecting the casting shrinkage rate mainly include the type of metal alloy, casting structure and size length. In addition, the molding material and the compactness of the core also affect the non-free shrinkage rate of the casting.

Because castings occupy a very important position in the entire valve manufacturing process, we also have high requirements for the quality control of castings. We have a complete set of testing tools and flow testing to ensure that each batch of goods is of high quality. qualified products. For specific testing equipment, please refer to About DongLi.

If you have other questions, please feel free to contact us.