Method of nitriding metal ring and apparatus therefor

A technology of nitriding treatment and metal ring, applied in metal material coating process, V-belt, coating and other directions, can solve problems such as difficulty in maintaining high toughness

Inactive Publication Date: 2005-10-19
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, if the technique is applied to the metal ring, the nitride layer will be formed over the entire thickness of the metal ring, making it difficult to maintain high toughness after the nitride layer is formed.

Method used

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  • Method of nitriding metal ring and apparatus therefor
  • Method of nitriding metal ring and apparatus therefor
  • Method of nitriding metal ring and apparatus therefor

Examples

Experimental program
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Embodiment Construction

[0052] When manufacturing the metal ring, first, as figure 1 As shown, a thin plate 1 of maraging steel is bent into a circle, and the ends are welded to form a cylindrical tank body 2 . The maraging steel is a low-carbon steel, and its C is 0.03% or less, Si is 0.10% or less, Mn is 0.10% or less, P is 0.01% or less, S is 0.01% or less, and contains 18-19% The so-called 18% Ni steel of Ni, 4.7-5.2% Mo, 0.05-0.15% Al, 0.50-0.70% Ti, 8.5-9.5% Co. At this time, the maraging steel exhibits age hardening due to the heat of welding, and therefore, portions with high hardness appear on both sides of the welded portion 2 a of the tank body 2 .

[0053] Therefore, next, by storing the can body 2 in the vacuum furnace 3 and keeping it at a temperature of 820-830° C. for 20-60 minutes, the first solution treatment is performed to eliminate hardness unevenness. After the first solution treatment is completed, the can body 2 is taken out from the vacuum furnace 3 and cut into a predeterm...

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Abstract

A metal ring made of maraging steel is heated in the presence of a halogen compound gas, so as to eliminate an oxide film from the surface of the metal ring and to form a halogenous compound film. Thereafter, the metal ring is heated under a vacuum or reduced pressure atmosphere to eliminate the halogenous compound film, and then it is maintained under an atmosphere comprising ammonia at a processing temperature ranging between 450 DEG C and 500 DEG C for a processing time ranging between 30 and 120 minutes, so as to carry out a nitriding processing. The above nitriding processing comprises the steps of: placing the above metal ring into a heating furnace and raising the temperature inside the heating furnace to the above processing temperature; introducing a first mixed gas consisting of 50% to 90% ammonia by volume, 0.1% to 0.9% oxygen by volume, and a residual volume consisting of nitrogen into the heating furnace, and maintaining the above processing temperature, so as to form a nitrided layer on the surface of the metal ring; and when the one-third to one-half of the processing time has passed, replacing the atmosphere inside the heating furnace by a second mixed gas consisting of 0% to 25% ammonia by volume and a residual volume consisting of nitrogen, and maintaining the above processing temperature until the remaining processing time passes.

Description

technical field [0001] The present invention relates to a nitriding treatment method and device for a metal ring made of maraging steel used in a continuously variable transmission belt or the like. Background technique [0002] As is well known, conventionally, a CVT drive belt used for power transmission of a continuously variable transmission (CVT) of an automobile or the like is formed by laminating a plurality of metal rings to form a laminated ring, and assembling the laminated rings into a predetermined formed element. Hold. [0003] The metal ring forming the laminated ring is made of low carbon steel containing Ni and Mo, such as maraging steel. The metal ring is formed by, for example, cutting a thin plate of low carbon steel into a rectangle, rolling the thin plate along the long sides, and welding the ends of the short sides to form a cylindrical tank body, and then Then, the can body is cut into endless rings according to the specified width to manufacture. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/02C23C8/26F16G5/16
CPCC23C8/02F16G5/16C23C8/26C23G5/00
Inventor 铃木贞次猿山将臣高垣雅志成田直树
Owner HONDA MOTOR CO LTD
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