Steel for cold punching, and element obtained therefrom for steel belt
A technology of cold stamping and components, applied in the direction of V-shaped belts, belts/chains/gears, furnace types, etc., can solve problems such as reducing productivity
Inactive Publication Date: 2014-01-08
HONDA MOTOR CO LTD
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Problems solved by technology
[0004] However, cold-stamped steel components will reduce productivity when using high-hardness steel
Method used
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[0034] The following is based on figure 1 A method of manufacturing a steel member for a steel belt of a belt-type CVT that is one embodiment of the present invention will be described.
[0035] First, softening heat treatment (S1) is performed on a thin steel sheet having a predetermined composition including a near-eutectoid composition having predetermined amounts of B and Ti to facilitate a later-described stamping process. According to such softening heat treatment, the thin steel plate is heated to a lower temperature within the austenite single-phase stable temperature range, that is, a temperature 20°C to 30°C higher than A3 and Acm, and is kept at this temperature for a predetermined time. and cooled at a predetermined rate. According to this softening heat treatment, it is possible to obtain a steel for cold stamping in which unsolubilized carbides are finely dispersed with B in the composition. The steel for cold stamping has good cold stamping properties, so that...
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Abstract
Provided are an element for steel belts to be used in belt-type CVTs which is excellent in terms of wear resistance and toughness and a steel for cold punching which gives the element. The steel for cold punching comprises a steel that has a composition satisfying the relationship 10.8[C]+5.6[Si]+2.7[Mn]+0.3[Cr]+7.8[Mo]+1.4[V]=13. This steel is characterized in that the composition comprises, in terms of mass%, 0.50-0.70% C, 0.03-0.60% Si, 0.50-1.00% Mn, 0.20-1.00% Cr, 0.01-0.10% Ti, and 0.0005-0.0050% B as essential additive elements, up to 0.025% P and up to 0.015% S as optional additive elements, and Fe and incidental impurities as the remainder. The steel is further characterized by having a hardness of 88 HRB or less, which has been imparted by forming a structure that comprises a mixed structure mainly composed of ferrite and pearlite and fine carbide grains dispersed in the mixed structure, and that was obtained by heating a raw steel to a temperature in the austenite single-phase region, holding the steel at the temperature, and then cooling the steel at a given rate.
Description
technical field [0001] The present invention relates to steel for cold stamping processed into a member for a steel belt used in a belt-type CVT for automobiles and the like, and the steel member. Background technique [0002] In a belt-type continuously variable transmission (CVT) of an automobile or the like, a steel belt is wound between a pair of pulleys on an input side and an output side to transmit power. The steel belt includes a structure in which a plurality of sheet-like members (steel sheets) are assembled so as to overlap along an endless belt. The steel belt is inserted into the V-shaped groove of the output side pulley and moves along the radial direction of the pulley when the groove width changes, making it possible to continuously adjust its radius of rotation and smoothly change the rotation ratio of the input and output side pulleys. [0003] As described above, since the steel member for the steel belt is continuously driven while being in contact with ...
Claims
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IPC IPC(8): C22C38/00C21D9/40C22C38/32F16G5/16
CPCF16G5/16C21D9/46C21D2211/009C21D1/25C22C38/04C21D2211/005C21D2211/004C22C38/22C22C38/02C21D9/0068C22C38/28C22C38/32C22C38/24
Inventor 高田健太郎寺田纮树加藤进一郎
Owner HONDA MOTOR CO LTD