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Production process of high-purity plunger piston

A production method and high-precision technology, which is applied in the production of plungers and the field of hydraulic plunger pumps, can solve the problems of matching and matching, equipment jamming, leakage, etc., and achieve the effect of high spherical precision and stable operation

Active Publication Date: 2008-02-20
WUXI YINGBEI PRECISION BEARING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The precision of the outer circle of the plunger is low, the roundness and straightness are above 3μm, and the surface roughness is above Ra0.2μm, resulting in matching and assembly, unstable operation, etc.
[0005] 2. The precision of the plunger ball head is low, the roundness is above 5μm, and the surface roughness is above Ra0.4μm, resulting in unstable operation and leakage.
[0006] 3. The surface chrome plating process is easy to cause environmental pollution, and the coating is easy to fall off, causing equipment to be stuck and other phenomena

Method used

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  • Production process of high-purity plunger piston

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Embodiment Construction

[0021] The invention relates to a production method of a high-precision plunger. The plunger is made of high-strength alloy steel or bearing steel, the outer circle part and the ball head part of the plunger are turned, and then the turned plunger is infiltrated. Carbon quenching heat treatment to meet the wear resistance requirements of the parts, and finally the outer circle part and ball head part of the plunger after heat treatment are ground.

[0022] The specific process parameters of the carburizing and quenching heat treatment are as follows (see Fig. 1):

[0023] 1. Wash the plunger parts in a washing machine and dry for 60 minutes;

[0024] 2. Preheat the dried plunger parts at 350-400°C for 40-50 minutes;

[0025] 3. Put the preheated plunger parts into the carburizing heat treatment furnace, raise the temperature to 840°C, keep the parts at 840°C for 30 minutes, control the carbon potential at CP=0.4, then raise the temperature to 880°C, and raise the carbon poten...

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Abstract

The invention relates to a manufacturing method of a high-precision plunger, the material adopts alloy steel or bearing steel and the technology adopts the flow of machining, heat treatment and grinding; the specific heat treatment steps are that: the plunger is preheated at a temperature of 350-400 DEG C for 40-50 minutes; the plunger is placed into the carburization heat treating furnace, then the temperature is raised to 840 DEG C and is kept for 30 minutes, the carbon potential (CP) is controlled to be 0.4, then the temperature is raised to 880 DEG C and the carbon potential (CP) is raised to 0.8 and kept for 20 minutes, then a surface carburization is made under the furnace temperature of 880 DEG C and the CP of 0.8 for 180 minutes, then the carbon potential is reduced to 0.7 for ten minutes, the furnace temperature is kept at 880 DEG C, then the surface carburization is made under the furnace temperature of 880 DEG C and the CP of 0.7 for 30 minutes, then is cooled to 100 DEG C for 50 minutes, and finally the temperature is raised to 800 DEG C for 10 minutes and then the plunger is removed from the furnace after keeping for 50 minutes at the temperature of 800 DEG C; is quenched in the oil for 15-25 minutes, the oil temperature is kept at 80 DEG C; the plunger is rinsed; and finally is tempered in a tempering furnace for 170-190 minutes at the temperature of 175-185 DEG C. The invention is environment-protective and the manufactured plunger has high precision.

Description

technical field [0001] The invention relates to a hydraulic plunger pump, in particular to a production method of a plunger of the hydraulic plunger pump. It belongs to the technical field of hydraulic control components. Background technique [0002] Hydraulic plunger pumps are widely used in control engineering such as hydraulic system control and hydraulic system execution. The main types of installed capacity are automobile engineering, aviation engineering, construction machinery and other industries. [0003] At present, the production method of the plunger of the same kind of hydraulic plunger pump with low precision is: car + grinding + electroplating. The plunger is mainly made of carbon steel, and the surface is chrome-plated. The main disadvantages are: [0004] 1. The precision of the outer circle of the plunger is low, the roundness and straightness are above 3μm, and the surface roughness is above Ra0.2μm, resulting in matching and assembling and unstable op...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B53/14C23C8/22C21D9/00C21D1/18
Inventor 陆建秋程道广张京谊蔡中辉
Owner WUXI YINGBEI PRECISION BEARING
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