SU975155A1 - Apparatus for centering blank - Google Patents

Description

(54) DEVICE FOR CENTERING THE PREPARATION

The invention relates to the processing of metals by pressure, in particular to the equipment of vertical presses; punching axisymmetric wheel type products.

In the manufacture of stamped rolled wheels, a press system and a wheel rolling mill are used. In the preliminary operations on the presses, centering is used to obtain the rim located symmetrically with respect to the rim in the rolling process on the mill. The alignment of the center of gravity of the workpiece with the vertical axis of the press is a prerequisite for obtaining wheels with minimal eccentricity. The latter allows achieving rational metal use by reducing machining allowances and reducing sorted products.

The center of gravity of many workpieces is not equidistant from its side surface, which is with the base for centering most of the known centrifuge devices.

A roller centering device is known, which includes a frame, rollers installed in movable bodies, a hydraulic system that provides for synchronous movement of the centering rollers C1.

In this device, the workpiece is centered with rollers located around the workpiece in the same plane, the names of the drive and moving the workpiece in the radial direction.

The centering base is the side surface of the workpiece. With asymmetry of the workpiece or its thickness variation, the center of the body of the workpiece is shifted from the axis of such a centering device.

The closest technical

15, an apparatus for centering a workpiece, comprising radially movable centerings associated with a C2 drive above a supporting table in the radial direction.

20

Claims (2)

The disadvantage is that the centering strips align with the axis of the press the center of the tongs with the workpiece clamped along the side surface. Consequently, the unevenness of the side surface of the workpiece and the flatness in the form of a wedge shape of the workpiece will lead to a shift of its center of gravity from the vertical axis of the press. The high requirements imposed on synchronization of the movement of the centering tongs of the tongs are not met due to the formation of backlash in the moving elements by glue. The aim of the invention is to improve the accuracy of centering the workpiece by aligning its center of gravity with the vertical axis of the press. The goal is achieved by the fact that the device for centering the workpiece, containing radially movable above the supporting table, the centering strips associated with the drive, is provided with a vertical rod protruding above the centering surface of the supporting table: as well as pivotally mounted at the end of the vertical rod support pad Support plank is made in the form of a disc, the diameter of which is chosen from the relation: fn TD-H), where d is the diameter of the disc of the support pad, ff; - the coefficient of friction of the pair billet - the reference platform FH - the coefficient of friction of the pair billet - centering bars, D - the diameter of the billet; H - the height of the workpiece. This is ensured by the presence of steps on the surface of the centering strips, with which the strips rest against the edge of the centered workpiece until the workpiece is installed on the rod with a gap relative to the upper working surface of the centering links. The drawing shows a device for centering the workpiece. The device contains a rod 1, provided with a supporting platform 2, placed on the supporting table of the press 3. Three above the supporting table are located (in the drawing, one centering strip 4 is shown conventionally, the upper surface of which has a stepped appearance. 5 rests on the platform 2 and the centering bar 4. The drives of the centering bars and the rod are conventionally not shown. The device works in the following manner. The workpiece is placed on the extended rod 1, s loaded with the support pad 2, then turn on the drives of the three centering strips 4, which move to the axis of the press. The not centered preparation laid on the rod is tilted in the direction of displacement of its center of gravity, the lower edge on the cloned workpiece meets one or two centering slats that offset in the direction of reducing the eccentricity between the center of gravity of the workpiece and the axis of the rod.With this, the moment of the force of gravity, the directional tilt of the workpiece, decreases. After the center of gravity moves beyond the edge of the rod, the force of gravity creates a moment aimed at setting the workpiece in a horizontal position. When the moment of gravity exceeds the moment of frictional force of a pair of billet - centering plate, the billet will move to a horizontal position and will rest only on the horizontal bar area. In this case, the center of gravity occupies a position close to the center of the rod axis, and the workpiece will come out of interaction with radially moving centering bars because the working surface of the rod is located above the working surface of the centering bars to the gap b. Therefore, further movement of the centering strips does not have a de-centering effect on the workpiece. The reciprocal position of the moving parts of the device after centering is shown by dotted lines in the drawing. After centering the workpiece, the centering strips return to their original position, the rod is embedded in the stamp, and the workpiece is subjected to deformation. The supporting platform made of alloyed steel protects the rod during the deformation of the metal and ensures its stability and reliability in operation. Improving the centering accuracy of the workpiece by aligning its center of gravity with the vertical axis of the press ensures uniform distribution of the metal in the die to obtain axisymmetric stamping and the symmetry of the wheel elements during subsequent rolling on the CTaiHe wheel rolling machine, improving metal use by reducing the allowances for machining and reducing sorted products, claims 1. Device for centering the workpiece containing movable above the supporting table in the radial In this direction, centering strips associated with the drive, characterized in that, in order to increase the centering accuracy by aligning the center of gravity of the workpiece with the vertical axis of the press, it is provided with a vertical rod installed in the center of the support table protruding above the surface of the centering slats, as well as hinged mounted on the end of the vertical rod supporting platform. 2 "The device according to claim 1, about t l and that is so that the support. the platform is made in the form of a disk, the diameter of which is chosen from the ratio d f. GP-N), f fn coefficient of friction of the pair blank - supporting platform; coefficient of friction of the pair billet - centering slats; P - diameter zagotoeki I - the height of the workpiece. Sources of information taken into account in the examination 1, USSR Copyright Certificate 495113, 1975. 2.Iifrin M.R. Etc. Production of all-wheel wheels and bandages. M., Metallurgizdat, 1954, p. 139-148 (prototype).