METHOD AND DEVICE FOR PRODUCTION OF HELICAL SPRINGS Russian patent published in 2013 - IPC B21F35/00 B21F3/00 

FIELD: process engineering.

SUBSTANCE: invention relates to machine building and can be sued for making helical springs for rolling stock. Proposed method comprises hearing of the bar, coiling the spring at heating temperature, quenching of the spring, its tempering and upsetting, grinding of spring ends, blasting and controlling of spring parameters. Spring parameters and those of production process are set. Prior to coiling, heated bar is reduced to spring end shape approximating to that of spring nonworking coils to roll said bar axially. Quenching is carried out using mechanical effects applied to ambient medium while spring parameters are controlled continuously at every production step by comparison with preset magnitudes and process parameters and corrected by appropriate program. Cyclic fatigue is controlled at arbitrarily selected springs prior to grinding their ends and after blasting. Invention covers also the device to implement abode described method. Stable performances of springs in production and correction.

EFFECT: higher quality.

2 cl, 1 dwg