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Ceramic thin film cast iron piston ring and manufacturing method thereof

A ceramic film, cast iron piston technology, applied in the field of piston rings, can solve the problems of poor wear resistance, large wear power loss, and large attack of the cylinder body, and achieves strong anti-sintering ability, stable performance and small wear. Effect

Inactive Publication Date: 2014-06-04
ANQING TP GOETZE PISTON RING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these coatings have certain limitations
For example: the chrome-plated coating has a large friction coefficient, a large loss of wear work, and is aggressive to the cylinder body, which is prone to cylinder scuffing; the molybdenum-sprayed coating has low hardness, poor abrasive wear resistance, and poor durability
The market generally reflects that cast iron piston rings with traditional surface treatment often suffer from severe wear and cylinder scuffing, which gradually cannot meet the requirements of engine development.

Method used

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  • Ceramic thin film cast iron piston ring and manufacturing method thereof
  • Ceramic thin film cast iron piston ring and manufacturing method thereof

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Experimental program
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specific Embodiment approach

[0035] see figure 1 , figure 2 , the wear-resistant cast iron piston ring of the present invention comprises a piston ring ring body 1, a transitional thin chromium plating layer 2 on the outer circumference of the ring, and a ceramic film 3 coated on the outer circumference of the thin chromium layer 2. The formation principle of the ceramic thin film 3 is: using Ti or Cr metal as the evaporation source, through arc discharge, and N 2 , O 2 React, and solidify on the nitrided layer of the target source of the piston ring to form TiN, CrN, CrN[O] ceramic thin films. The metal vaporization ion rate is high, and the deposition effect is good. The specific embodiment of the present invention is as follows:

Embodiment approach 1

[0037] Step 1. Conventional preliminary processing of piston rings such as casting, cutting, copying, and inner circle turning;

[0038] Step 2, processing the outer circular surface and the upper and lower sides of the piston ring through a grinding process;

[0039] Step 3. Use ultrasonic waves to clean and degrease the surface of the piston ring;

[0040] Step 4: Use the clamping cylinder to clamp the piston ring and polish the outer surface;

[0041] Step 5, chrome plating treatment on the outer circle, the treatment time is 0.5 hours, and the temperature of the electroplating bath is 60°C;

[0042] Step 6, sandblasting the inner and outer surfaces;

[0043] Step 7. Piston ring degreasing and cleaning;

[0044] Step 8: Loading into PVD furnace, PVD treatment, treatment process time: 15-20 hours, treatment temperature: 400-500°C.

[0045] Step 9, honing and finishing of the outer circular surface;

[0046] Step 10. Grinding and finishing the upper and lower sides.

Embodiment approach 2

[0048] Step 1. Conventional preliminary processing of piston rings such as casting, cutting, copying, and inner circle turning;

[0049] Step 2, processing the outer circular surface and the upper and lower sides of the piston ring through a grinding process;

[0050] Step 3. Use ultrasonic waves to clean and degrease the surface of the piston ring;

[0051] Step 4. Use the clamping cylinder to clamp the piston ring and polish the outer surface:

[0052] Step five, sandblasting the inner and outer surfaces;

[0053] Step 6. Degreasing and cleaning the piston ring;

[0054] Step 7: Loading into a PVD furnace for PVD treatment. Processing time: 17-22 hours, processing temperature: 400-500°C. If the ceramic film is CrN or CrN[O], just install the chromium block target, use Cr metal as the evaporation source, discharge through the arc, and set the PVD furnace program, and do not feed N within 2 hours at the beginning of the discharge. 2 , O 2 , only metal chromium ions are d...

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Abstract

The invention discloses a ceramic thin film cast iron piston ring. According to a manufacturing method, a thin chromium layer is arranged on the outer circle surface of a ring body in an electroplating or physical vapor deposition mode, and then a hard ceramic thin film coating is formed on the outer circle surface of the thin chromium layer in a physical vapor deposition mode. The problem that abrasion resistance and anti-sintering performance of an existing cast iron piston ring can not meet the requirement for high output and high emission limit of a modern automobile is solved, and the ceramic thin film cast iron piston ring is particularly suitable for the requirements of modern automobile development.

Description

1. Technical field [0001] The invention relates to a piston ring, in particular to a ceramic film cast iron piston ring and a preparation method thereof. 2. Background technology [0002] In order to further reduce fuel consumption and reduce emissions, more supercharged and direct injection engines have been developed. Compared with traditional engines, these engines have the characteristics of high explosion pressure, high speed, high power, and high torque. At the same time, higher requirements were put forward. So far, the surface treatment options for cast iron piston rings are still relatively small, and common ones include chrome plating and molybdenum spraying. However, these coatings have certain limitations. For example: the chrome-plated coating has a large friction coefficient, a large loss of wear work, and is highly aggressive to the cylinder, which is prone to cylinder scuffing; the molybdenum sprayed coating has low hardness, poor abrasive wear resistance, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J9/26F16J9/28
Inventor 王星王东升汪谦瑾
Owner ANQING TP GOETZE PISTON RING
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