Metal deforming – With use of control means energized in response to activator... – Sensing work or product
Patent
1997-06-03
1999-02-02
Hail, III, Joseph J.
Metal deforming
With use of control means energized in response to activator...
Sensing work or product
72 186, 72 195, 72 197, 72135, 72183, 226 21, 226137, 2424181, B21B 3700
Patent
active
058650512
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention relates to a procedure and an apparatus for continuous inspection and correction of errors occurring on spring wires destinated for optimized manufacture of coil springs on automatic spring winding machines, whereby a wire is uncoiled by an uncoiling device in which a spool or coil is provided, and fed into a forming apparatus by means of a separate feeding device containing winding pins or rollers.
Coil springs must meet steadily increasing accuracy requirements of industrial users with regard to their compliance with constructionally fixed spring parameters, especially the characteristic curve of the spring. The reasons for this are in particular the increasing requirements for machines and apparatuses in which coil springs are used, as well as the growing degree of automation in the manufacture of machines and apparatuses with the trend to limit the work to components with narrow tolerances.
The spring wire as basic material is subject to fluctuations depending on material, geometry, and processing technology. Said fluctuations become visible by deviations of the wire diameter, the mechanical strength properties or the material parameters from their nominal values and by twists as a result of elastic torsion stress. In addition, a decisive role is played by deviations resulting from the plastic-elastic deformation behaviour of the spring wire having its origin mostly in previous manufacturing stages.
The abovementioned fluctuations cause considerable deviations of the parameters of the cold-formed coil spring from the fixed constructional data, the effects of which can be seen in deviations of the spring characteristic curve from the desired characteristic curve.
In particular, the fluctuating thickness of the wire diameter causes inclination changes of the spring characteristic curve, i.e. fluctuations of the spring rate, and the different elastic torsion stresses in the wire coil cause length fluctuations of the produced spring and thus parallel displacements of the spring characteristic curve.
Inevitably, this leads to scrap during spring production which may be considerably high when the springs are of small dimensions and must meet high accuracy requirements. Since said scrap in most cases is stated not before the spring is completed, considerable economic losses arise. Moreover, the necessary supplementary requirements of material and energy are additional threats to the environment.
The state of the art discloses machines for spring production provided with intake rollers, mechanically or electrically controlled winding pins or rollers, pitch tools and forming tools. First they were developed mainly with the aim to produce highest possible numbers of pieces and to guarantee the conversion to the production of springs with different dimensions and forms at justifiable costs.
The state of the art further discloses machines with supervisory and quality assurance systems in which the spring length is measured or inspected mechanically, optically, capacitively or by induction change.
Further, other systems are known which recognize and sort out scrap springs with the help of said measuring or inspection facilities and which automatically correct the control of the automatic spring winding machine. As a rule, this is carried out based on methods for statistical process control. Other existing variations furnish error signals to the operator via dialog systems when the finished springs have deviations, so that the operator has to intervene by correcting the control. Further, other systems are known which interrupt the manufacturing process after a certain number of scrap springs produced in succession.
JP 55-153 633 (A) discloses a configuration designed to prevent torsional stress of a steel rope during unwinding from a coil by a controlled turn of the unwinding coil. Hereby said turn of the unwinding coil is scanned by a sensor which controls the turning movement of a fixed run-off roller over which the rope is guided. This configuration can not be used to determine and to i
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Otzen Uwe
Schorcht Hans-Jurgen
Weiss Mathias
Hail III Joseph J.
Tolan Ed
WAFIOS Maschinenfabrik GmbH & Co. Kommanditgesellschaft
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