SU1165510A1 - Method of producing hollow forgings - Google Patents

Description

The invention relates to methods of hot forging, used primarily for the manufacture of hollow forgings such as hubs with a flange. five

The purpose of the invention is to reduce the consumption of metal and the complexity of manufacturing by reducing the number of technological transitions.

The drawing shows a device for the implementation of the method of manufacturing of hollow body forgings.

The device contains a matrix 1, an adversary 2, a flanging matrix 3, a paunson-matrix 4, an ejector 5, 15

prefabricated 6.

A method of manufacturing forgings is as follows.

The original billet, cut off on press shears, for example, from steel 20 38XC is heated to a forging temperature of 1220 ° C and transferred to a steam-air stamping hammer with a mass of falling parts of 10 tons. On a hammer stamp it is precipitated with a degree of deformation of 30% and stream are placed in a finishing die, wherein the semifinished product is stamped in the form of a bowl with a bottom and an annular thickening & H - height of 27 mm, the thickness of the flange Ηφ zo is 19 mm, the outer diameter of the thickening 39 is performed _in equal 410 mm.

Then, the semi-finished product 6 with the obtained parameters is laid with a burr on the matrix 1 and centered along its cutting edge.

At the beginning of the press slide, the hole is stitched by the enemy 2. With the further course of the crimping die 3 presses on the annular thickening 40

and the flange and moves the semi-finished product, while cutting the burr and the flanging of the hub occurs with a paunson-matrix 4. After the flanging is completed, the forging is pushed out of the die using the ejector 5 during the return stroke of the press ram with the help of biases

Given the quantitative interval of the ratio of the size of the annular thickening due to the data obtained in the process of conducting experimental stamping.

When flanging a semifinished product with an annular thickening with an outer diameter of 'less than 1.01 of the outer diameter of the hub, it collapses, as a result of which the crimping matrix completely presses against the flange, which is bent before the flanging process begins.

With an increase in the diameter of the thickening (for example, Mfr, 1.03 of the outer diameter of the hub), high-quality forgings are obtained, but the metal consumption increases. Making a thickening with a height of less than 1.5 flange thickness (for example, 1.4 flange thickness) results in cutting it in the flanging process. Increasing the height (more than two flange thicknesses) leads to increased metal consumption.

Based on the foregoing, the above quantitative ranges of the ratio of sizes are optimal from the point of view of the goal, as they provide forgings for one heating with the minimum consumption, the lowest labor costs and energy consumption.

Claims (1)

METHOD FOR PRODUCING HOLLOW forgings type hub flange, preferably with a thickness less than the thickness of the forging wall, comprising obtaining a semifinished product in the form of a bowl with a bottom piercing central hole, cutting burr and flanging with a force of deforming the flange, characterized in that _L for the purpose saving metal and reducing the complexity of manufacturing, on the area of the outer surface of the semi-finished product adjacent to the flange, perform a thickening with a height equal to 1.5-2 thicknesses of the flange and an outer diameter equal to 1.01-1.02 outwardly diameter of the hub forging, and when flanging make an additional force to the end surface of the thickening. I 1165510 2