Piston rod machining process

A processing technology and piston rod technology, applied in the field of piston rod processing technology, can solve the problems of oil cylinder service cycle, shortened life, scratches, sharp corners on the surface of the coating, etc., to improve the surface hardness, fatigue strength and wear resistance. , good pressure loss and corrosion resistance, and the effect of reducing production costs

Inactive Publication Date: 2015-03-25
WUZHONG DISTRICT GUANGFU JINYI HARDWARE FITTINGS FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the piston rods used in most hydraulic cylinders are generally ground after milling or clamping, directly electroplated after grinding, polished with abrasive belts after electroplating, and then used directly; due to the relatively large particles of the abrasive belt, the surface of the coating cannot be removed There are electroplating shavings between the micro-grain

Method used

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Embodiment Construction

[0010] A piston rod processing technology according to the present invention, the processing technology includes the following steps: forging blank—annealing—rough turning—heat treatment quenching—semi-finishing turning—ultrasonic flaw detection—boring center oil hole—milling key groove—drilling pin hole - stable tempering heat treatment - ceramic coating - grinding outer circle - nitriding heat treatment - fine grinding with Sic grinding wheel; the nitriding temperature is controlled at 520°C and kept for 18 hours; the stable tempered heat treatment temperature is controlled at 500°C and kept warm The time is more than 4 hours; the coating thickness of the sprayed ceramic coating is 300 μm; the principle of spraying the ceramic coating is to send the gas into the plasma spray gun, ionize it into a high-temperature ion gas above 1000 °C through high-frequency ignition, and then pass through the anode The nozzle is ejected at high speed, and the powder is sent into the flame thr...

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PUM

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Abstract

The invention discloses a piston rod machining process. The piston rod machining process comprises the working procedures of blank forging, annealing, rough turning, heat treatment quenching and tempering, semi-finish turning, ultrasonic flaw detection, central oil hole boring, key groove milling, pin hole drilling, stable tempering heat treatment, ceramic coating spraying, external grinding, nitriding heat treatment and Sic grinding wheel precision grinding. According to the piston rod machining process, physical characteristics of the surface of a piston rod are changed, and the piston is good in pressure loss resistance and corrosion resistance due to the ceramic coating spraying process added to the piston rod; through the follow-up nitriding heat treatment process, the surface hardness, fatigue resistance and abrasive resistance of the piston rod are improved, and therefore product quality is greatly improved, and production cost is lowered.

Description

technical field [0001] The invention relates to a processing technology, in particular to a piston rod processing technology. Background technique [0002] At present, the piston rods used in most hydraulic cylinders are generally ground after milling or clamping, directly electroplated after grinding, polished with abrasive belts after electroplating, and then used directly; due to the relatively large particles of the abrasive belt, the surface of the coating cannot be removed There are electroplating shavings between the micro-grains, so that the surface of the coating shows sharp corners and unevenness under the microscope. The long-term reciprocating movement of the piston rod in a high-pressure environment will cause scratches to the seal, and the seal is easily damaged. At the same time, there are also scratches on the surface of the piston rod , The overall service cycle and life of the oil cylinder are shortened. Contents of the invention [0003] In view of the ...

Claims

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Application Information

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IPC IPC(8): B23P15/00C23C28/00
CPCB23P15/00C23C28/00F16J7/00
Inventor 黄建芳
Owner WUZHONG DISTRICT GUANGFU JINYI HARDWARE FITTINGS FACTORY
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