SU603325A3 - Method of making cylindrical articles - Google Patents

Description

(54) METHOD OF MANUFACTURING CYLINDRICAL PRODUCTS

This invention relates to the field of sheet metal forming.

A known method of manufacturing cylindrical articles by cutting a flat billet, drawing a semifinished product without thinning the side wall and then extending it with thinning the side wall without changing the diameter 1.

In a known way, it is impossible to obtain products with a reinforced bottom part and a flange from the open end.

According to the proposed method, to obtain products with a reinforced bottom part and a flange on the side of the open end, after stretching with thinning, the final stretching is carried out with a reduction in m of the diameter of the semi-finished product, preserving the previous transition along the entire perimeter of the wall thickness, while providing the bottom grounding and clamping the flange of the product being stretched, and after stretching the flange is trimmed.

FIG. 1 shows a blank for drawing; in fig. 2 - semi-finished product after stretching without wall thinning; in fig. 3 - semi-finished product after stretching with thinning without changing the diameter; in fig. 4 - product after the final stretching with the formation of a flange and a thickened bottom and around the hollow area; on

FIG. 5 - finished product after trimming the flange and forming the side wall; in fig. 6 shows a device for making hollow articles, general view; in fig. 7 is an enlarged image of the device; in fig. 8 is a sequence of manufacturing a hollow article in the device; in fig. 9 - device at the flange trimming site.

The product is stamped in the following sequence. First cut down the sheet

0 the workpiece and the hollow semi-finished product is drawn, which is then subjected to stretching with wall thinning - drawing. Thereafter, stretching is carried out without changing the thickness of the bottom and wall with decreasing diameter and obtaining a hollow product with a thickened bottom and near-bottom part and a flange at the open end. In the course of the final LIGHTING, the bottom of the product being pulled is rigidly clamped, in particular, the bottom is molded. After stretching, the flange is cut, and ribs are formed on the side wall of the product.

The operations, starting with cutting the blank and ending with trimming the flange, in addition to forming ribs on the side wall, are carried out in a device containing a telescopic jancon 1, made of two parts; ring

the punch of the first and second stretch and the step punch 2 of the final stretch, having a step 3 of smaller diameter, which allows to obtain a thickened near-hollow section on the product, and a recess 4 on the working end, which ensures the molding of the bottom of the product. The punch 2 is provided with trim rings 5 for trimming the product flange. The device also contains a punching matrix 6 and a punch 7 for the first drawing and punching, a second drawing matrix 8, a final drawing matrix 9, an ejector 10 made in the form of a punch for forming the bottom of the product, a matrix 11 for cutting the flange, a puller 12 and a clamp. 13.

The device is mounted on a triple press. A feed strip 14 is fed to the device. First, the die-cutter 6 begins to descend, and on the cutting edge of the punch-matrix 7, the sheet blanks are cut. Further, phanson 1 is lowered and pushes the sheet stock through the punch-matrix 7 and the matrix 8. In this way, the first and second transitions are stretched. During the drawing process, the pressure gauge 13, due to the pressure of the compressed air entering through the channel 15, presses the workpiece against the surface of the die-matrix 7. The spacecraft I, having made two stretches, lowers until it stops in the matrix 9 and, during the final drawing, provides pressure on the flange of the product 16 At the final stage of machining the workpiece, the punch 2 lowers, producing a final stretch through the matrix 9. During the drawing process, this part of the product 16 is clamped by forming the bottom on the ejector 10. At the end of the working stroke of the punch 2 The hot ring 5 reaches the trimmed matrix 11 and occurs

BUT

flange trimming. During the press up the ejector 10 pushes the product 16 out of the cavity of the dies, and the pick-up 12 lifts the strip 14.

The proposed method allows the manufacture of hollow products used in the canning industry — high quality cans, since the flange of the hollow product obtained at the final stretching stage does not have cracks and is suitable for subsequent rolling, and the bottom of the product also has a thickened okolodonny area , provides additional resistance when hit.

Claims (1)

Invention Formula A method of manufacturing cylindrical articles by cutting a flat billet, drawing a semifinished product without thinning the side wall and then drawing the latter with thinning the side wall without changing the diameter, characterized in that, in order to obtain products with a reinforced bottom and flange from the open end, stretching with thinning provides the final stretching with decreasing the diameter of the semi-finished product, preserving over the entire perimeter of the wall of the previous transition and the formation of the flange, while ensuring pinching the bottom and clamping the flange of the product being stretched, and after drawing the flange trimming. Sources of information taken into account in the examination: I. “Advanced technology of deep-drawing of sheet materials. Collection of conference reports, Tula 1968, p. 126. FIG. Sh p i five / 4 LI t-1 I .1 tr CL: /; :; X; X H-.- .. - --1-, T,. vv :: -x: n T}:; ::  v v.v /four