Hollow stabilizer and method of manufacturing the same

a manufacturing method and stabilizer technology, applied in the direction of interconnection systems, metal-working apparatuses, vehicle components, etc., can solve the problems of high manufacturing cost, frequent starting point of fatigue failure, and high manufacturing cos

Inactive Publication Date: 2002-11-21
NHK SPRING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, a starting point of a fatigue failure frequently moves from the outer surface portion to the inner surface portion due to the shot peening.
However, in this technique, there is a problem in that the manufacturing cost becomes rather high because the drawing process is executed.
However, in accordance with the manufacturing method, the manufacturing cost becomes rather high because the drawing process is executed, and there is a problem in that the maximum thickness is limited due to a limit in a cold drawing capacity and a range of selection in the design is narrow.
However, since a defect such as a bead or the like exists in an inner surface portion, and the processing cost of the shot peening on the inner surface is rather high, this shot peening is not executed very frequently.
As mentioned above, when applying the shot peening to the outer surface portion, there are cases in which fatigue failure is generated in the inner surface portion in which the stress is lower than that of the outer surface portion.

Method used

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  • Hollow stabilizer and method of manufacturing the same
  • Hollow stabilizer and method of manufacturing the same
  • Hollow stabilizer and method of manufacturing the same

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embodiment 1

[0037] Embodiment 1

[0038] Next, particular manufactured embodiments are described and further details of the present invention will be given. Table 1 shows respective specifications of a solid stabilizer having a wire diameter of 27 mm, and a hollow stabilizer having substantially the same spring constant as that of the solid stabilizer. In this case, the respective stabilizers are structured such that the heat treatment, the shot peening, and the coating are applied. Further more, main stresses at the time of imparting a deformation of the same stroke to the respective stabilizers are also described in Table 1, and the values are shown in FIG. 3.

1TABLE 1 Thickness Spring Main Stress at Main Stress at Ratio Constant Outer Surface Inner Surface No Material Size (t / D) (N / mm) Portion (MPa) Portion (MPa) 1 Solid, Diameter 27 -- 25.1 365 --2 Diameter 30.0 .times. t3.5 11.7% 24.9 591 458 3 Diameter 28.6 .times. t4.7 16.4% 24.8 499 339 4 Diameter 28.0 .times. t5.5 19.6% 25.2 475 304 5 Diam...

embodiment 2

[0041] Embodiment 2

[0042] A durability test was performed by employing nine hollow stabilizers having outer diameters and thicknesses as shown in Table 2 and solid stabilizers having a diameter of 25 mm. Further more, it was investigated at which of the inner or outer surface portions of the hollow stabilizer the starting point of breakage was generated, a ratio of maximum stresses generated on the inner and outer surfaces (inner surface stress / outer surface stress) is investigated, and the results thereof are also described in Table 2. Further more, a ratio of fatigue life of the hollow stabilizer with respect to a fatigue life of the solid stabilizer and a ratio of mass are calculated, and the results thereof are also described in Table 2. An S-N graph of the hollow stabilizer is shown in FIG. 5.

[0043] As shown in Table 2 and FIG. 5, in the hollow stabilizer in which the thickness ratio is equal to or greater than 20%, all of the starting points of breakage exist in the outer surf...

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Abstract

In a method of manufacturing a hollow stabilizer, a pipe compressing step of compressing an electroseamed pipe in a temperature range of a hot state or a warm state so as to make a rate of a thickness with respect to an outer diameter between 18 and 35% is performed, and a forming step of forming the compressed electroseamed pipe in a stabilizer shape in a cold state is executed. Next, a step of applying a heat treatment to a half-finished stabilizer is performed, a shot peening step of impacting a shot on the half-finished stabilizer is performed, and a step of coating the half-finished stabilizer is performed.

Description

[0001] 1. Technical Field[0002] The present invention relates to a method of manufacturing a hollow stabilizer used for vehicles such as automobiles or the like, and more particularly, relates to a technology for increasing durability as much as possible.[0003] 2. Related Art[0004] In recent years, stabilizers are mounted on most vehicles for the purpose of increasing roll rigidity. A stabilizer includes a solid stabilizer using a round bar as a material, and a hollow stabilizer using a pipe as a material for the purpose of saving weight. In the stabilizer, a spring constant is set for each type of automobile in order to obtain the roll rigidity required for the automobile. Accordingly, a wire diameter is selected for the solid stabilizer. In the case of changing the design from a solid stabilizer to a hollow stabilizer in order to reduce the weight of the automobile, the outer diameter of the hollow stabilizer necessarily becomes larger than the wire diameter of the solid stabilize...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B24C1/10B21D53/88B23P15/00B60G21/055
CPCB23P15/00Y10T29/49622B60G21/055B60G21/0551B60G2204/1222B60G2204/1224B60G2204/416B60G2204/422B60G2204/44B60G2204/45B60G2204/82B60G2204/8302B60G2204/8306B60G2206/427B60G2206/72B60G2206/80B60G2206/8103B60G2206/81035B60G2206/8201B60G2206/84B60G2206/8403B23P2700/14
Inventor KOYAMA, HIROSHITAMATSU, KOICHISUGAWARA, MASATOUMENO, JUNMACHIDA, HIROSHIMASUYA, HIROSHIKIMURA, FUMIAKITSUJI, YASUAKIKATSUYA, AKIHIRONAKAMURA, TAKAHIRO
Owner NHK SPRING CO LTD
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