Shear Spinning Research Articles

Experimental Study of Shear Spinning

Many researchers have done some work on the analysis of shear spinning process. But their works are limited to a certain extent. This paper deals with the experiment on the shear spinning process of aluminium to find out the fundamental characters in detail. The influence of the following working conditions is discussed ; roller position angle, clearance between roller and mandrel, feed of roller, cone angle, speed of rotation of mandrel, roller corner radius, roller diameter, blank thickness and blank diameter. In addition, the deformation theory of simple shear which is derived from the observation of the experiments, is checked about tangential force Pθ. It is said that there is an optimum blank thickness ts, of which the calculated values agree with the experiments, and if the blank thickness is smaller than ts, the theoretical value is overestimated, but underestimated, if it is the other way round.

Study of Shear Spinning : 2nd Report, Theoretical Investigation

This paper deals with a theoretical study of shear spinning process, which was clarified by the experiments described in the previous report. Assuming that tha deformation of shear spinning is divided into the three parts, which are redundant bending at the start line of contact, shearing and bending on the contact surface between the roller and the blank, the tangential force are evaluated from the total work of deformation in an infinitesimal time interval. The calculated results are checked not noly by the experimental results of the previous report, but the data of Spincraft, Cincinnati, and S.Kobayashi's reports. The state of contact between the roller and the blank are indicated numerically for several working conditions by introducing the contact factor m. In addition, it is indicated that the the axial and radial force components can be estimated apploximately by the optimum angles of frictional components υθ and υψ.

スピニング加工法の研究(第1報)

Metal spinning is a method of forming flat disks of sheet metal on a lathe into cylindrical or cone shape. The former is the conventional simple spinning and the latter is socalled flowturning method (shear spinning), which has been a powerful forming process in the product enginering. In order to analyze the forming process of metal spinning, the authors investigate the conventional simple spinning process about aluminum at first, and find out the fundamental characteres.The drawing limit, strain distribution and the three components of working force are researched on the several working conditions. The three components of force are calculated by the simple analysis of the energy method. Then the authors find a clue to clarify the mechanics of spinning.

Closure to “Discussions of ‘A Theory of Shear Spinning of Cones’” (1961, ASME J. Eng. Ind., 83, pp. 494–495)

Closure to “Discussions of ‘A Theory of Shear Spinning of Cones’” (1961, ASME J. Eng. Ind., 83, pp. 494–495)

A Theory of Shear Spinning of Cones

The theoretical deformation mechanism of shear spinning of cones was re-evalued. It was found that the predicted tangential or power spinning forces for commercially pure aluminum and lead for several spinning conditions agreed well with the experimental data. In addition, the normal force and axial force components were also evaluated and fair agreement between theory and experiment was achieved.

On the Mechanics of Shear Spinning

With the use of an idealized model of the shear spinning process some of the basic quantities in the shearing mechanism have been defined and formulated, these being: shear strain, shear strain rate, specific energy, and tangential force (torque) in spinning. An experimental technique to study metal flow in shear spinning has been described. The results of analytical work have been compared with experimental data.

A New Test Method for Determination of Spinnability of Metals

A new test method is described whereby the spinnability, i.e., the ability to undergo shear spinning deformation, without fracture, of any material may be determined. Work done to date with this test method indicates that a good nonspinning criterion for estimating spinnability is the tensile reduction of area at fracture. Results of the spinnability test suggest that a feature of this test be adopted in the design of production cone-spinning mandrels. A qualitative discussion of the effects of deviating from the sine law is presented.