JPH02136052U

JPH02136052U -

Info

Publication number: JPH02136052U
Application number: JP4398589U
Authority: JP
Priority date: 1989-04-17
Filing date: 1989-04-17
Publication date: 1990-11-13

Description

[Brief explanation of the drawing]

第１図は本考案装置が焼入れの対象とする大径
軸部材の部分正面図、第２図ａは本考案装置にお
ける加熱コイル例の平面図および正面図、第２図
ｂは第２図ａに示す加熱コイルの回路図、第３図
は本考案装置における割型冷却装置例の正面図、
第４図は本考案装置による焼入れ済み多段部の硬
さ試験結果であつて、ａは各部表面の硬さばらつ
き分布図と線合表、ｂおよびｃそれぞれは各周面
および段差部の硬化層深さを示す線図、第５図は
本考案装置による焼入れ済み多段部の残留応力測
定試験位置および結果を示す正面図および線図、
第６図ａ〜ｃそれぞれは試作冷却装置の正面図お
よび表面硬さ試験結果を示す硬さばらつき分布図
と線合表、第７図ａおよびｂは従来段付き軸焼入
れ装置の正面図および硬さ線図、第８図ａおよび
ｂは他の従来段付き軸焼入れ装置の正面図および
硬さ線図である。Ｗ…軸部材、イ〜ニ…加熱導体、１０…ヘアピ
ン型誘導加熱コイル、２０…割型冷却装置、ａ〜
ｆ…周面、２４ａ〜２６ｂ…半円弧状冷却ジヤケ
ツト。 Fig. 1 is a partial front view of a large-diameter shaft member to be hardened by the device of the present invention, Fig. 2a is a plan view and a front view of an example of a heating coil in the device of the present invention, and Fig. 2b is a partial front view of a large-diameter shaft member to be hardened by the device of the present invention. FIG. 3 is a front view of an example of a split type cooling device in the device of the present invention,
Figure 4 shows the hardness test results of a hardened multi-step part using the device of the present invention, in which a is a hardness variation distribution chart and a line combination table on the surface of each part, b and c are hardened layers on each peripheral surface and step part, respectively. A diagram showing the depth; FIG. 5 is a front view and a diagram showing the positions and results of the residual stress measurement test of the hardened multi-stage part using the device of the present invention;
Figures 6 a to c are a front view of a prototype cooling device, a hardness variation distribution chart and a line combination table showing the surface hardness test results, and Figures 7 a and b are a front view and a hardness distribution chart of a conventional stepped shaft hardening device. Figures 8a and 8b are a front view and hardness diagram of another conventional stepped shaft hardening device. W...shaft member, a~d...heating conductor, 10...hairpin type induction heating coil, 20...split type cooling device, a~
f...Surrounding surface, 24a to 26b...Semicircular arc shaped cooling jacket.

Claims

[Scope of Claim for Utility Model Registration] (1) A device for hardening the entire surface area of a multi-step part formed on a large-diameter shaft member having at least two or more steps and a large step difference, A hairpin type induction heating coil equipped with a plurality of heating conductors that can face each other with a predetermined gap while following the surface, and a split type cooling device that is placed close to one end of the coil and can be opened and closed about the axis of the shaft member. One half and the other half of the split type cooling device each include a plurality of semicircular arc-shaped cooling jackets that can be individually and independently opposed to half circumferences of each of the plurality of diameter circumferential surfaces forming the multi-stage section with a predetermined gap therebetween. In the closed position, the corresponding semicircular cooling jackets on one half side and the other half unite to form a plurality of annular jackets, and a predetermined interval is maintained between the end faces of adjacent annular jackets. , a multi-step surface hardening device for a large-diameter shaft member, which is configured to allow the maximum diameter portion of the shaft member to pass through in the open position. (2) The multi-step surface hardening device for a large-diameter shaft member according to claim 1, wherein the inner circumferential surface of each of the annular jackets is parallel to the axis of the shaft member, and the cooling fluid can be injected perpendicularly to the axis.