RU1784356C - Sheet blank for drawing cylindrical part with two longitudinal grooves - Google Patents

Abstract

Usage: refers to the processing of metals by pressure and can be used in mechanical engineering for drawing cylindrical parts with two longitudinal grooves in the wall. It allows to improve the quality of the grooves in the manufacture of the part, the arc length of the circumference of the neutral layer of which is limited by the walls of the grooves is less than the diameter of the conventional round billet. The smaller side of the rectangle in which the sheet blank is inscribed is equal to the arc length of the circle of the neutral layer of the end face of the finished part, limited by the walls of its grooves. The large side of the rectangle has a value equal to the sum of the diameter of the conditional round billet and the doubled groove height of the finished part. The concave portions of the large side have a segment arrow relative to the lines passing through the mating points of the central and concave portions of the larger side and tangent to the rounded corners of the workpiece, not exceeding 0.3 mm. During drawing, the smaller sides of the workpiece form the open end of the finished part, and the concave sections form the walls of the grooves, 2 silt.

Description

The invention relates to the processing of metals by pressure, in particular to sheet blanks for drawing a cylindrical part with two longitudinal grooves in the wall, and can be used, for example, for the manufacture of filling cups and other products in instrument making, radio industry and other fields of national economy.

The aim of the invention is to improve the quality of the grooves in the manufacture of parts, the circumference of the neutral layer of the end face of which, limited by the walls of its grooves, is less than the diameter of the conventional round billet.

In FIG. 1 shows a workpiece; in FIG. 2 - ready part, side view and plan.

The sheet blank has the shape of a figure inscribed in a rectangle with a larger

and lesser sides symmetrical with respect to the symmetry axes of the workpiece and rounded by angles equal to the radius of mating of the open end of the part with the walls of its grooves.

The smaller side of the workpiece has the shape of an arc of a circle of radius equal to the sum of half the diameter of the conditional round workpiece required to draw a hollow semi-finished product with a diameter equal to the diameter of the finished part and a height equal to the distance from the bottom of the groove of the finished part, with the center lying on the longitudinal axis of symmetry blanks.

The smaller side of the rectangle into which the workpiece is inscribed is equal to the diameter of the conditional round workpiece, and the smaller side of the workpiece is equal to the length of the arc around 4 00

word about

the neutral layer of the end face of the finished part, limited by the walls of its grooves.

The larger side of the rectangle has a value equal to the sum of the diameter of the conditional round billet and the double height of the groove of the finished part, and the larger side of the billet has concave sections symmetrically located relative to the central part1 of the guide, made out along a circular arc with a segment arrow relative to the lines passing through the mating points central and concave sections of the greater side and tangent to the rounded corners of the workpiece, not exceeding 0.3 mm

The angle between the radii passing through the junctions of the central (convex) and concave sections of the larger side is equal to the angle between the radii passing through the intersection of the circle of the neutral layer of the finished part with the walls of one of its grooves.

The part is drawn from the workpiece as follows.

During the convolution of the workpiece, the extraction is actually performed to a height n less than the total height h + hi of the finished part, and the section hi only undergoes a bending cycle, with the smaller sides of the workpiece forming the open end of the finished dbtal, the concave sections of the larger side are the groove walls, and the arcs circles of the greater side - the bottom of the groove. The radii of rounding during the drawing process are practically unchanged and form rounded edges of the grooves.

The specified parameters of the workpiece provide a cylindrical part with two longitudinal grooves of the same width over the entire height of the groove, since the grooves do not have a reduced width in the area adjacent to the open end.

Thus, this prefabricated gto, in comparison with the known one, allows to improve the quality of the grooves in the manufacture of the part, which eliminates additional mechanical processing of the grooves and thereby reduces the complexity of manufacturing the finished product. Reducing labor costs for manufacturing reduces the cost of the resulting cylindrical parts.

Claims (1)

The claims A sheet blank for drawing a cylindrical part with two longitudinal grooves from the side of the open end, mating with the walls of the grooves along an arc of a circle, is made in the form of a shape inscribed in a rectangle with a larger and smaller side symmetrical with respect to axes of symmetry of the workpiece and angles rounded along an arc of a circle equal to the radius of mating of the open end of the finished part with the walls of its grooves, while the smaller side of the sheet blank has a convex shape in the form of an arc of a circle with a radius equal to the sum of twice the height of the groove of the finished part and the radius of the conditional round the workpiece necessary for drawing a hollow semi-finished product with a radius equal to the radius of the finished part and a height equal to the distance from the bottom to the groove of the finished part, the larger side is equal to the sum of the nominal round diameter of forging and doubled groove height of the finished part, the central portion of the larger side has the shape of a circular arc with a radius of a conditional round billet, conjugated with its concave sections made along a circular arc, and symmetrically located relative to the central section, and the angle between the radii passing through the points the junction of the central and concave sections of the larger side is equal to the angle between the radii passing through the points of intersection of the circumference of the neutral layer of the finished part with the walls of its groove, distinguishing so that in order to improve the quality of the grooves of the part, the circumference of the neutral layer of the end face of which, limited by the walls of its grooves, is smaller than the diameter of the conventional round billet, the smaller side of the workpiece is equal to the arc length of the circle of the neutral layer of the end of the finished part bounded by the walls of its grooves, and concave sections have a segment arrow relative to lines passing through the mating points of the central and concave sections of the larger side and tangent to the rounded corners of the workpiece, not exceeding 0.3mm. D 2hf .1