Die casting is a Aluminium or Zinc metal casting process that is characterized by forcing nolten metal under high pressure into a die mold cavity. The mold cavity is created using two hardened tool steel dies which have been machined into shape and work similarly to an injection mould during the process. Most die castings are made from non-ferrous metals, specifically zinc, copper, aluminium, magnesium, lead, pewter, and tin-based alloys. Depending on the type of metal being cast, a hot- or cold-chamber machine is used.
The casting equipment and the metal dies represent large capital costs and this tends to limit the process to high-volume production. Manufacture of parts using die casting is relatively simple, involving only four main steps, which keeps the incremental cost per item low. It is especially suited for a large quantity of small- to medium-sized castings, which is why die casting produces more castings than any other casting process. Die castings are characterized by a very good surface finish (by casting standards) and dimensional consistency.
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The plunger pump outlet valve and the outlet valve seat are also a pair of precision mating parts that cannot be interchanged after mating grinding. The mating clearance is 0.01mm. The oil outlet valve is a one-way valve. Under the action of the spring pressure, the upper conical surface of the valve and the valve seat are closely matched. The function is to isolate the high pressure oil pipe from the upper cavity of the plunger when the supply is stopped to prevent the oil in the high pressure oil pipe. Into the injection pump. The lower part of the oil valve has a cross section that can both guide and pass diesel. There is a small cylindrical surface under the cone surface of the oil outlet valve, which is called a decompression ring belt. Its role is to rapidly reduce the oil pressure in the high-pressure oil pipe when the oil supply ends, and to avoid the phenomenon of oil dripping at the injection hole. When the belt falls into the valve seat, the upper volume quickly increases, the pressure rapidly decreases, and the stoppage occurs quickly. The Vickers plunger has a chute on the cylindrical surface of the head and communicates with the top through a radial hole and an axial hole. Its purpose is to change the circulating oil supply; the Vickers plunger has an inlet and outlet oil. The holes are all in communication with the low-pressure oil chamber inside the pump. After the plunger is set in the upper body of the pump, positioning screws are used. The position of the Vickers plunger head chute is different, and the method of changing the fuel supply is also different. The oil outlet valve is a one-way valve. Under the action of the spring pressure, the upper conical surface of the valve and the valve seat are closely matched. The function is to isolate the high pressure oil pipe from the upper cavity of the plunger when the supply is stopped to prevent the oil in the high pressure oil pipe. Into the injection pump. The lower part of the oil valve has a cross section that can both guide and pass diesel. There is a small cylindrical surface under the cone surface of the oil outlet valve, which is called a decompression ring belt. Its role is to rapidly reduce the oil pressure in the high-pressure oil pipe when the oil supply ends, and to avoid the phenomenon of oil dripping at the injection hole. When the belt falls into the valve seat, the upper volume quickly increases, the pressure rapidly decreases, and the stoppage occurs quickly.
The plunger pump has a chute on the surface and communicates with the top through the radial hole and the axial hole. Its purpose is to change the circulating oil supply; the plunger is equipped with inlet and outlet oil holes, both on the pump body After the oil chamber is connected and the plunger is fitted into the upper body of the pump, the positioning screw is used for positioning. The position of the plunger head is different, and the method of changing the fuel supply is different.