Metal deforming – By deflecting successively-presented portions of work during... – With feeding of discrete articles or orienting of work...
Patent
1989-04-12
1991-03-26
Larson, Lowell A.
Metal deforming
By deflecting successively-presented portions of work during...
With feeding of discrete articles or orienting of work...
72134, 72212, 72213, 72220, B21D 704
Patent
active
050019180
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to the metal press working, and more specifically, it deals with a method and apparatus for making blanks of a profile varying lengthwise. The invention may be most advantageously used for making blanks of few-leaf springs for automobile vehicles, tractors and railway vehicles.
BACKGROUND OF THE INVENTION
Rolling strips of a profile varying lengthwise is one of the most complicated processes of metal press working, the difficulties mainly arising because of the need to produce blanks with accurate dimensions, especially as regards height and width of the section at various points lengthwise of the blank in view of a transient process of metal deformation. With transient rolling processes which are characteristic of the manufacture of strips of a profile varying lengthwise, forward slip and spreading of metal are variables which vary over a broad range not only depending on the taper angle, but also on the character of a change (decrease or increase) in reduction. All these factors cause the need for maximum possible stabilization of metal rolling conditions.
In addition, stringent requirements are imposed upon blanks for few-leaf springs as regards identity of properties over the whole length and presence of open metal texture along the longitudinal axis of the blank which have a special effect on reliability and durability.
Known in the art is a method for making strips of a profile varying lengthwise, in particular, blanks of few-leaf springs, comprising heating a billet, preliminarily reducing it in wedge-shaped dies edgewise on both ends of the billet on a movable table and rolling a varying profile first of one run of the billet during the forward stroke of the table and then the other run during the return stroke of the table between two driven rolls, the upper roll being vertically reciprocatable.
An apparatus for carrying out this method comprises wedge-shaped dies for preliminarily reducing the billet edgewise on both ends, a movable table for supporting the billet, a roll stand having a pair of driven workrolls, the upper roll being reciprocatable, and a means for moving the upper roll.
However, with this method and apparatus for making strips of a profile varying lengthwise, in particular, blanks of few-leaf springs, it is necessary to have sophisticated electronic servo systems so as to ensure accurate dimensions of the strip, especially its thickness because of an inadequate rigidity of the means for vertically moving the upper roll. The provision of the means for moving the upper roll and for supporting the billet on the table substantially complicates design of the roll stand. The need to perform two rolling operations (during forward and return strokes of the table) to form a two-sided taper on the strip prolongs the production process. In addition, the runs of the spring may be of different properties with respect to its central zone because they are rolled consecutively and generally under different temperature conditions.
Also known in the art is a method for making blanks of a profile varying lengthwise, in particular, blanks of few-leaf springs, comprising heating a billet, placing it on a groove of a movable sizing former, feeding the former carrying the billet to a deformation zone, and rolling the billet by driven rolls.
According to the prior art method, a blank of a profile varying lengthwise is manufactured in a single pass in one direction on a sizing former having a groove configured to correspond to the shape of the blank formed after the rolling. To compensate for a spread occurring in rolling a varying profile with this method, the heated billet is preliminarily reduced widthwise in vertical driven rolls before placing on the sizing former.
It is, however, difficult to ensure accurate dimensions of the finished product with this method because of forward slip and spread of metal which vary depending on the amount of reduction. As the rolling process occurs in one direction only and begins with maximum reductions, the metal volume red
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I. L. Perlin et al., "Teoriya Volochenia", 1971, Metallurgia, (Moscow), see pp. 72, Fig. 55.
V. P. Severdenko et al., "Prokatka S Malymi Obzhatiyami", 1968, Nauka I Tekhnika, (Minsk), see pp. 176-177.
Spravochnik "Prokatnoe Proizvodstvo", vol. 1, 1962, Metallurgizdat, (Moscow), see p. 464, FIG. 25.
Benedis Sergei S.
Grechenko Alexandr P.
Isaevich Georgy A.
Korol Vladimir A.
Markhasin Vitaly L.
Larson Lowell A.
Schoeffler Thomas C.
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