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Ball element for two-part ball pivot and corresponding method of production

A spherical element and journal technology, which is used in the field of spherical elements and manufacturing for split spherical journals, can solve problems such as impact points, and achieve the effects of reducing wear, saving material costs, and shortening time

Active Publication Date: 2007-04-18
ZF FRIEDRICHSHAFEN AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the problem of creating impact points on the surface of the sphere should be overcome

Method used

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  • Ball element for two-part ball pivot and corresponding method of production
  • Ball element for two-part ball pivot and corresponding method of production
  • Ball element for two-part ball pivot and corresponding method of production

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Experimental program
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Effect test

Embodiment Construction

[0040] Figure 1 shows at high magnification a photomicrograph of the ferrite-pearlite structure of a quenched and tempered steel used for spheres according to the prior art. Specifically, it refers to the organization of a standard quenched and tempered steel with a hot-rolled steel number of 41Cr4.

[0041] Figure 2 shows a photomicrograph of a microalloyed carbon-manganese steel for spheres according to the invention, also with a ferritic-pearlite structure, which has the same magnification as the photomicrograph of the quenched and tempered steel according to Figure 1 multiple.

[0042] In this case, this refers to the microalloyed steel, which is likewise hot-rolled during manufacture, in the designation 35V1 or C-M-V.

[0043] This steel has the following alloying elements (all parameters are weight percent):

[0044] 0.35%C; 0.20%Si; 0.75%Mn; 0.02%P; 0.02%S; 0.20%Cr;

[0045] Looking at Figures 1 and 2, it can be seen that the microalloyed steel according to Figure 2 ...

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Abstract

A process is provided for manufacturing balls, especially for ball and socket joints, as well as to a ball element for two-part ball pivots. The microalloyed carbon-manganese steel balls are manufactured by cold extrusion and subsequent grinding. Annealing can thus be completely eliminated, as a result of which a less expensive material can be used. The process makes possible a manufacture of balls especially for two-part ball pivots in a simpler manner and at a lower cost, and the surface finish and the material quality as well as the strength and the wear resistance are at the same time preserved or increased. As a result, the effort needed to manufacture the balls is reduced, and, moreover, the problem of the impact marks often developing on the ball surfaces during tempering is eliminated.

Description

technical field [0001] The invention relates to a method for producing balls or spherical elements, in particular for ball joints, according to claim 1 . The invention also relates to a spherical element for a split spherical journal according to the preamble of claim 7 . Background technique [0002] Split ball journals generally consist of a journal element and a separate ball perforated for receiving the journal element. It is known here to use cold extrusion to produce balls, precisely spherical elements, such as, for example, balls or spherical elements with holes, for split spherical journals. Quenched and tempered steels are generally used in the prior art for the manufacture of balls for split spherical journals. After the spheres are cold-extruded, the spheres are first tempered. Associated with the tempering process is the quenching of the spheres by pouring the heated or softened spheres from the tempering furnace into the quenching medium. [0003] However, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C11/06C21D7/02C22C38/04B21K1/02B21K1/76C21D9/36
CPCF16C11/0609F16C2204/74F16C23/045B21K1/762B21K1/02F16C2204/62F16C2220/48Y10T29/49664C21D7/02C22C38/04F16C11/06
Inventor J·克鲁塞D·阿达姆克兹克R·斯托特劳J·-P·卡斯塔纳特
Owner ZF FRIEDRICHSHAFEN AG