SU871977A1 - Method of producing articles with lateral branches - Google Patents

Description

I

The invention relates to the processing of metals by pressure and can be used in the production of parts with spikes, for example, valves.

A known method for producing products with lateral processes, is that a workpiece with a supercritical height-to-diameter ratio is placed in the die cavity and stamped by transverse extrusion 1.

The disadvantage of this method is the low quality of the products due to the formation of a fold in the first stage of deformation of the workpiece by the punch (slump stage) due to buckling, which, when subsequently extruded, passes into the clamp and the weft.

The purpose of the invention is to improve the quality of products.

The goal is achieved by the fact that according to the method of obtaining products with lateral processes, namely, a workpiece with a supercritical height-to-diameter ratio is placed in the die cavity and punching is carried out by transverse extrusion, the workpiece is bent in the region of the product process by the deflection

0, lb 07cf

where 5 is a one-sided allowance for placing the workpiece in the die cavity, and when stacked in the cavity of the stamp, the workpiece has a concave surface in the direction of formation of the process of the product.

Preliminary bending of the workpiece with a ratio of length to diameter greater than 3 and placing it with a concave surface in the direction of the lateral cavity of the chip under the process of the product changes the kinematics of metal flow at the first non-deformation stage of deformation (free draft).

FIG. Figure 1 shows the original cylindrical billet; in fig. 2 — curved stock for transverse extrusion; in fig. 3 - the same, placed in the stamp;

20 in FIG. 4 - developmental dynamics of the process.

The method is carried out as follows.

Claims (1)

The cylindrical billet is pre-bent to a value of 0, -O, 7Cf, where 5 is an allowance for placing the billet in the die cavity; t - the amount of deflection. Allowance and stacking of the workpiece are as follows: for hot extrusion of workpieces obtained from calibrated steel from 0.2 to 1.2 mm; For hot extrusion of blanks produced from hot-rolled steel with an accuracy of 0.5 to 15.0 m. When the deforming punch touches the end of the workpiece and further deformations, the deflection increases to the contact of the external side of the bend with the die wall, three foci form in the workpiece deformations: at the end of the workpiece in contact with the deforming punch; on the outer side of the bend in contact with the wall of the stamp; at the end of the workpiece in contact with the bottom of the die cavity. Initially, there is almost no thickening of the workpiece, basically there is an increase in the area of contact of the workpiece with the surface of the stamp. The contact area at the outer side of the bend increases most intensively and when the contact area reaches 60-70% of the side surface area, the workpiece is thickened from the bend. The thickening occurs non-uniformly and is accompanied by the process of filling the corner elements. The initial thickening is localized at the end face of the deforming punch and as it moves down the punch, the thickening spreads throughout the workpiece (see Fig. 4). This does not result in the formation of a fold and its stamping, since the located free side cavities on the inner side of the bend allow the folding of the fold — the line of the gob goes into the ajB line. Example. The method will be tested when stamping the needle valve body, which is widespread in the energy armature during the growth of the body of the needle valve. The stacking packs are carried out on a press with a force of 500 ts in the metal forming laboratory of the TsNIITMASH. The proposed method allows to obtain parts without wrinkles and clips. The punching is made from hot-rolled blanks, from steel 20 and steel 12Х1МФ. The lubricant is a mixture consisting of silver graphite 2 parts by weight. soda ash 1 weight.h. and water added in amounts to provide a pasty state. The heating temperature of the blanks is 59-1180 ° C. The gap provided for placing the blanks is 20-5-5 mm for housings for housings; for enclosures DN 50-12 mm. Bending is carried out by the value of: for enclosures DN 20–1.5 mm ;; for enclosures DN 50 - 4.2 mm. The proposed method of obtaining products with side processes provides the possibility of obtaining high-quality products from blanks, the height of which exceeds 2.5--3 diameters with the presence of technological gap for placing the blank. This is especially important in the mass production of stampings in the manufacture of products from unprocessed preforms. Due to the increase in the number of suitable forgings, the expected economic effect when implemented in production will be about 2500 r. Claims method for producing products with lateral processes, which means that the workpiece with supercritical height-to-diameter ratio is placed in the die cavity and is stamped by transverse extrusion, characterized in that, in order to improve the quality of the products, the workpiece is bent in the process of forming the process products by the amount of deflection 0,, 7cC, where 5 is the averaging allowance for laying the workpiece in the die cavity, and for placing the workpiece in the die cavity, the workpiece is placed with a concave surface towards the side Azovian spike product. Sources of information taken into account during the examination 1. Hot pressing of forgings in dies with separable dies, Voronezh, ENIKMASH, 1967, p. 12-20.