Cold forming process for manufacturing ball pivots

a technology of ball pivots and forming processes, which is applied in the direction of manufacturing tools, mechanical equipment, rotary machine parts, etc., can solve the problems of generating cost-intensive and time-consuming operations, reducing the need for manufacturing costs, and requiring the purchase of waste materials as a first semi-finished produ

Inactive Publication Date: 2009-02-12
ZF FRIEDRICHSHAFEN AG
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Benefits of technology

[0006]The object of the present invention is to provide a process for manufacturing ball pivots with a ball area, a cone area and a thread area, in which the number of

Problems solved by technology

In addition, there is a disadvantage that the waste material must first be purchased as a semifinished product.
In addition, it is disadvantageous that cycle times that would substantially exceed a number of 10 pieces per minute ar

Method used

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  • Cold forming process for manufacturing ball pivots
  • Cold forming process for manufacturing ball pivots
  • Cold forming process for manufacturing ball pivots

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Embodiment Construction

[0026]Referring to the drawings in particular, the ball pivot blank shown in FIG. 1 is manufactured by means of an extrusion process and comprises essentially a plurality of partial areas of different three-dimensional shapes arranged one after another in the longitudinal direction of the ball pivot. After extrusion, the different areas are to be formed into their final shape by means of the combination of process features that are essential for the present invention, and a ball pivot shape corresponding to the view in FIG. 3C is obtained after completion of the cold forming according to the present invention.

[0027]Thus, the ball pivot blank, designated by 1 as a whole, comprises, according to the view in FIG. 1, a cylindrical area 2, which is arranged at a free end of the ball pivot blank 1 and on which a thread for fastening the ball pivot to a machine or body component is located after the completion of the ball pivot. The cylindrical area 2 is joined directly by a cone area 3. T...

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Abstract

A cold forming process for manufacturing ball pivots with a ball area, a cone area and a thread area for installation in ball and socket joints by cold forming is presented, in which a ball pivot blank (1) with a shaped cone area (3) and cylindrical areas for the thread (2) and the ball (5) is manufactured at first from a bar-shaped semifinished bar stock by extrusion. The extrusion operation is followed by the forming of the ball area as another manufacturing step by means of a rolling processes. At the same time, the thread area can be formed in its final shape. Thus, the ball pivot is manufactured as a whole by cold forming only and it makes it possible to significantly increase the production output per unit of time compared to the processes known from the state of the art. At the same time, it is possible to use less expensive grades of steel, because sufficient fatigue strength of the ball pivot can be guaranteed by the cold forming.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]This application is a United States National Phase application of International Application PCT / DE 2004 / 002614 and claims the benefit of priority under 35 U.S.C. § 119 of German Patent Application DE 103 56 111.0 filed Nov. 27, 2003, the entire contents of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention pertains to a cold forming process for manufacturing ball pivots with a ball area, a cone area and a thread area for installation in ball and socket joints.BACKGROUND OF THE INVENTION[0003]Machining as well as non-machining manufacturing processes are used, in principle, to manufacture ball pivots that are intended for installation in ball and socket joints. Larger amounts of waste material, which must be disposed of, take place during machining. In addition, there is a disadvantage that the waste material must first be purchased as a semifinished product. In addition, it is disadvantageous that...

Claims

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Application Information

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IPC IPC(8): B21D53/10B21H1/00B21H1/18B21H7/18B21K1/02B21K1/76B23P15/00F16C11/06
CPCB21H1/00B21H1/18B21H7/182B21K1/02Y10T29/49664B23P15/00B23P2700/11F16C11/0604B21K1/762F16C2220/48B21H7/00
Inventor KRUSE, JOCHENROSENBERGER, KLAUS
Owner ZF FRIEDRICHSHAFEN AG
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