Metal deforming – With cutting – By shearing tool-couple
Reexamination Certificate
2000-02-04
2001-09-25
Crane, Daniel C. (Department: 3725)
Metal deforming
With cutting
By shearing tool-couple
C072S342100, C029S897200
Reexamination Certificate
active
06293134
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a method of producing a sheet steel product, for example, a beam, in a press process in which a blank is stamped.
2. Background Information
A method for producing steel products is described in GB 149035-A. An important advantage of the process is that sheet steel products of complicated form can be produced and, despite the complicated form, can have narrow tolerances in form and size.
Conventionally, in order to have a still higher accuracy on certain parts, for example, guiding holes and the like, a machining operation, for example, punching of holes, is carried out on the finished product. This machining operation causes high wear on the tools and might cause a reduction in the fatigue strength.
OBJECT OF THE INVENTION
It may be an object of the present invention to provide, in an essentially simple and cost-effective way, holes that have an essentially high accuracy in size and in position in the finished product. According to the invention, these holes may be finished by the collaring of pre-made holes directly in a press.
SUMMARY OF THE INVENTION
One feature of the present invention resides broadly in a method of producing a motor vehicle bumper beam from sheet steel using a progressive die system, said method comprising the steps of forming a sheet metal blank from sheet steel to form a bumper beam; punching, with a plurality of punches, a plurality of holes in the sheet metal blank, of a predetermined size and configuration, for a plurality of collared holes to be formed in the sheet metal blank; moving the sheet metal blank to at least one stamping machine having a pair of dies configured to stamp the sheet metal blank and form a motor vehicle bumper beam; placing the sheet metal blank between the pair of dies configured to hold the sheet metal blank and configured to collar holes in the sheet metal blank; stamping the sheet metal blank; collaring the plurality of holes in the sheet metal blank and forming the motor vehicle bumper beam; and holding the formed motor vehicle bumper beam for a predetermined period of time between the pair of dies configured to form the motor vehicle bumper beam.
The above-discussed embodiments of the present invention will be described further hereinbelow with reference to the accompanying figures. When the word “invention” is used in this specification, the word “invention” includes “inventions”, that is, the plural of “invention”. By stating “invention”, the Applicant does not in any way admit that the present application does not include more than one patentably and non-obviously distinct invention, and maintains that this application may include more than one patentably and non-obviously distinct invention. The Applicant hereby asserts that the disclosure of this application may include more than one invention, and, in the event that there is more than one invention, that these inventions may be patentable and non-obvious one with respect to the other.
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Crane Daniel C.
Nils H. Ljungman & Associates
SSAB Hardtech AB
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