Metal deforming – By use of tool acting during relative rotation between tool... – With metal deformation of different type
Patent
1982-02-23
1984-09-11
Larson, Lowell A.
Metal deforming
By use of tool acting during relative rotation between tool...
With metal deformation of different type
72 69, 72 84, 72342, 72367, B21D 4104
Patent
active
044702817
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to the field of metal working and more particularly to methods of forming an end face wall having a concentric recess in a tubular workpiece, utilizing rolling.
BACKGROUND ART
The problem of forming an end face wall having a concentric recess in a tubular workpiece arose due to the necessity of considerably increasing the efficiency of manufacturing the bodies of belt conveyor rollers.
According to conventional methods, such bodies have been made of a case and inserts placed into the case and joined by welding or rolling-in therewith. Such methods are labour-consuming, low efficient and metal-wasting.
Making such bodies all-in-one by casting would only increase these disadvantages adding such ones as the limited choice in metal and dimensions of bodies and would also increase the amount of machining them.
The problem of forming all-in-one bodies of conveyor rollers in connection with known in the art methods of metal working may be taken as a general problem of forming a face wall having a concentric recess in a hollow cylindrical article.
Known in the art is a method of forming a recess in the bottom of a cylindrical body by reverse drawing (see V. P. Romanovsky, "Spravochnik po knolodnoy shtampovke" /Cold Stamping Handlbook/, 6th edition, 1979, Leningrad, "Mashinostroenie" Publishing House, pp. 128-129) comprising locating the body in a female die having an internal opening concentrical to the outer surface which is smoothly conjugated with the wall of the opening, and pressing the bottom into the opening of the female die by a male die. This results in bending the metal of the body according to the radius of the female die surfaces conjugation and thus in the formation of a concentric recess in the bottom.
The above method cannot be utilized for the production of all-in-one bodies of conveyor rollers because by this method a face wall having a recess may be obtained only at one end of a hollow cylindrical workpiece while the other end thereof is open. Moreover, a recess obtained by this method has a limited range of diameters which are dependent on the reduction ratio of the material.
The problem under consideration may be solved, for example, by unrestrictedly reversing a tubular workpiece end inwardly.
One of the methods utilizing such reversing consists in upsetting a tubular workpiece end in a die designed for the purpose by axially motioning the tubular workpiece while heating the metal of the workpiece in the area of deformation. This results in bending the wall of the workpiece according to a radius of free bend inside the tubular workpiece and moving the metal of the bent edge thereof in the direction opposite to motion of the remaining portion of the workpiece.
An internal neck is obtained in the workpiece, which neck is conjugated with the side wall of the workpiece by means of an end face having a toroidal surface (see O. V. Popov, "Izgotovlenie Tselnoshtampovannykh Tonkostennykh Detaley Peremennogo secheniya" /Production of All-Stamped Thin-Walled Parts of Variable Sections/, 1974, Moscow, Mashinostroenie" Publishing House, p.p. 57-62).
Necks of only a definite diameter depending on the external diameter of a workpiece may be obtained by the above method in thin-walled tubular workpieces because under other conditions the method is unstable. Moreover, the shape of the end face wall of the workpiece cannot be another than toroidal. Besides, the efficiency of the method is decreased by the necessity of heating in the area of deformation.
The abovementioned disadvantages of the prior art methods of stamping on one hand, and the equipment simplicity and high efficiency of prior art methods of rolling on the other hand helped the workers in the art to adhere to the latter methods in searching for the ways of manufacturing all-in-one bodies of conveyor rollers.
Known in said field is a method of forming in a cylindrical article an end face wall having a concentric recess of any predetermined size and shape by sequentially rolling, first, the recess and, th
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V. P. Romanovsky, "Spravochnik po Kholognoy Shtampovke" (Cold Stamping Handbook), 6-th Edition, 1979, Leningrad, Mashinostroenie Publishing House, pp. 128, 129.
O. V. Popov, "Izgotovlenie Tselnoshtampovannykh Tonkostennykh Detaley Peremennogo Secheniya" (Production of All-Stamped Thin-Walled Parts of Variable Sections), 1974, Moscow, Mashinostroenie Publishing House, pp. 57-62.
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Chemeris Valentina P.
Gnutov Anatoly N.
Golberg Boris S.
Kaporovich Vladimir G.
Kaporovich Vladimir V.
Kramotorsky Industrialny Institut
Larson Lowell A.
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