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Powdered metallurgical piston ring and process for production thereof

A powder metallurgy and piston ring technology, applied in the field of piston rings, can solve the problems of high quality requirements of piston rings, large production investment, and difficult processing, and achieve the effects of reducing surface treatment procedures, reducing production costs, and shortening production cycles.

Inactive Publication Date: 2007-04-11
吴立新 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the production of cast iron piston rings has a history of more than 100 years, due to the high quality requirements of piston rings and the difficulty of processing, the traditional production and processing methods have more than 50 processes, resulting in large production investment, high cost and long cycle , high scrap rate, and pollute the environment

Method used

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  • Powdered metallurgical piston ring and process for production thereof
  • Powdered metallurgical piston ring and process for production thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Powder preparation: 70wt% of the hard phase iron-containing boride (wherein, 15wt% of boron carbide, 4wt% of potassium fluoroborate, 81wt% of iron powder), 0.02wt% of RECe-40 mixed rare earth elements, and the rest are Steel powder, mixed ingredients, after conventional wet grinding, filtration, drying process, prepared into the required powder, and then mixed with a small amount of paraffin, ready to use;

[0017] Forming the green body: Using a press and a mold, press the above-mentioned prepared powder to form the required green body;

[0018] Sintered blank: put the green compact in a sintering furnace and sinter at 1100°C for 40 minutes to obtain the required piston ring blank;

[0019] Grinding both ends of the blank: Grinding the two ends of the blank to the required size with a counter grinder;

[0020] Cutting: use a wire cutting machine to cut the opening;

[0021] Grinding inner and outer circles: Grinding the inner circle with an internal grinder to meet t...

Embodiment 2

[0026] The production process is the same as in Example 1, except that 80wt% of the hard phase iron-containing boride (wherein, 20wt% of boron carbide, 5wt% of potassium fluoroborate, and 75wt% of iron powder) is used in the powder preparation process, 0.03wt% RECe-48 mixed rare earth elements, and the rest is iron powder. In addition, in the process of sintering the blank, the sintering temperature is 1300° C. and the sintering time is 20 minutes.

[0027] The powder metallurgy piston ring made by this method can be used in gasoline engines of heavy vehicles.

Embodiment 3

[0029] The production process is the same as in Example 1, except that 30wt% of the hard phase iron-containing boride (wherein, 25wt% of boron carbide, 3wt% of potassium fluoroborate, and 72wt% of iron powder) is used in the powder preparation process, 1wt% of RECe-40 is mixed rare earth elements, and the rest is iron powder. In addition, in the process of sintering the blank, the sintering temperature is 1250° C. and the sintering time is 30 minutes.

[0030] The powder metallurgy piston ring made by this method can be used in diesel engine.

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Abstract

This invention provided to be possible to send out represents the vehicle speed the vehicle speed signal installment. A control unit, gets up by the constitution is the execution; When the transmission gearbox has the second speed, expresses the vehicle speed by the vehicle speed signal to be equal to or to be lower than - as soon as prearranges the speed time, starts to operate has completely released the first coupling to mesh the condition; When after that the vehicle speed changes was equal to or is lower than - second prearranges the speed time, starts to operate releases the second coupling to mesh the condition, second prearranges the speed to be lower than as soon as prearranges the speed; When its vehicle speed changes was equal to or is lower than - third prearranges the speed time, starts to operate has completely released the second coupling to mesh the condition as well as causes the first coupling from completely to release the condition to become meshes the condition, third prearranges the speed to be lower than second prearranges the speed.

Description

technical field [0001] The invention relates to a piston ring and a production method thereof, more precisely, the invention relates to a powder metallurgy piston ring and a production method thereof. Background technique [0002] Piston rings are very important parts in internal combustion engines and compressors, which are installed on pistons. According to their different functions, piston rings can be divided into two categories: gas rings and oil rings. The gas ring is mainly used for sealing and heat conduction, and is installed on the upper part of the piston ring zone; the oil ring is mainly used for scraping oil, and is installed under the gas ring. At present, the piston ring material generally adopts gray cast iron or alloy cast iron or ductile iron with pearlite as the matrix. Surface treatment such as phosphating. On page 350 of the second edition of the first volume of the first volume of the "Mechanical Design Manual" published by the Chemical Industry Pres...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F5/02F16J9/00F16J9/02C22C38/54F16J9/26
Inventor 吴立新张国寿
Owner 吴立新
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