Machining method of hollow plunger

Abstract

The invention discloses a machining method of a hollow plunger, and belongs to the technical field of hollow plunger machining. The machining method includes the sequentially-conducted steps that a bar material is selected; the bar material is subjected to softening processing after being subjected to blanking; surface processing is conducted on the bar material subjected to softening processing;lubricating processing is conducted on the bar material subjected to surface processing; cold extruding is conducted on the bar material subjected to lubricating processing to form a plunger body upper portion and a plunger body lower portion; a ball head and a lubrication hole of the plunger body upper portion are machined, and the plunger body lower portion and a middle lubrication hole are machined; the plunger body upper portion and the plunger body lower portion are welded in a friction welding manner; friction welding flashes are subjected to rough turning; hardening and tempering processing and nitriding processing are conducted on a plunger body obtained after welding is completed; and outer circles of the ball head and the plunger body are ground, and machining of the hollow plunger is completed. The plunger body machined and formed through the machining method is small in thermal expansion amount, the influence of temperature on changes of the fit clearance of the plunger outer diameter and a cylinder body is small, and therefore stability of a plunger pump is improved.

Description

technical field

[0001] The invention belongs to the field of hollow plunger processing, and relates to a processing method of a hollow plunger. Background technique

[0002] The plunger pump is an important device in the hydraulic system. It relies on the reciprocating movement of the plunger in the cylinder to change the volume of the sealed working chamber to realize oil absorption and oil pressure. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency and convenient flow adjustment. Piston pumps are widely used in high pressure, large flow and occasions where the flow needs to be adjusted, such as hydraulic presses, engineering machinery and ships.

[0003] According to the different plunger body, the plunger pump is generally divided into single plunger pump, horizontal plunger pump, axial plunger pump and radial plunger pump. The plunger body of the existing plunger pump is mostly a solid structure, the weight is relatively la...

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