SU764813A1 - Method of sizing the blanks of cylindrical articles - Google Patents

Description

one

The invention relates to the processing of metals by pressure and can be used in the technology of the field industry in the manufacture of cylindrical roller blanks, as well as for calibrating chopped piece blanks in diameter and height.

There is a known method for calibrating billets of cylindrical products by reducing them in a rigid matrix (1J.

The disadvantage of this method is the low accuracy of the billets produced and the low quality of the products made from them because of the possibility of plate formation during reduction.

The purpose of the invention is to improve the accuracy of blanks and product quality.

To achieve this goal, before reduction, a barrel-shaped thickening is planted on one of the end parts of the billet along its side surface, and when reducing, the blank is pushed with the indicated thickening forward.

In addition, pushing the workpiece during the reduction can be done with the next workpiece.

FIG. 1-5 schematically show the calibration sequence of the workpiece; in fig. 6–8 — Initial stock after the end of the barrel end of the barrel) thickening and after reduction.

Calibration of cylindrical billet blanks, such as rollers, is performed in a die having three positions — loading, disembarking and reducing. At the first position (Fig.) Loading is made of the rubbing piece billet I into the carbide-shielded movable matrix 2, enclosed in body 3 and movable therein due to spring 4. After moving to the second position (fig.2), blank 1 is loaded into the movable matrix 2 it is deposited by a punch 5 with a hard-hinged insert 6 with the formation of a barrel-shaped end thickening in the gap between the die 2 and the support 7.

Claims (2)

Barrel thickening, the formation of which is associated with the weights of blanks during cutting, is formed by making a cone within 5-10 ° on a length of 5-10 mm on the lower part of the working matrix 2 and a radius on the support 7. The shape of the thickening allows further reduction planted blank without folding. When the press ram moves upward, the planted billet together with the movable matrix is transferred to the reduction position (Fig. 3), where it is pushed out of the movable matrix 2 under the influence of the punch 8 and then reduced into the stationary carbide matrix 9, pressed into the body 10. Then it goes to the reduction position the next planted billet 1 (Fig. 4). Moreover, when the punch 8 puts pressure on the planted billet, the movable bandage matrix 2 smoothly sits on the plane of the support 10, because the height of the protruding part of the planted billet from the matrix 2 is greater than the distance from the supporting surface to the plane of the end face of the cylindrical billet located in matrix 9 reduction. Under the influence of the punch 8 (Fig. 5), the planted billet 1, as a “plastic punch, finally reduces and pushes the previous cylindrical billet out of the matrix 9, and occupies itself t; its place in this matrix, and the cycle repeats. Chopped thickening and reduction can be used to carry out the technological operations of stripping and reduction, after phosphating and saponification. When using a chopped unprepared piece, it is necessary to apply lubricant to the chip. As an example in FIG. 6-8 shows the technological transitions of the process of cold volumetric calibration of cylindrical roller blanks p / n 42726 LM. From the analysis of the dimensional parameters of the calibrated blanks, the transitions can be judged on the modes of their execution. Thus, the landing of the bulge on the billet of the roller (Fig. 7) is carried out with the degree of fit within 6-7%, and the degree of reduction of the planted billet (Fig. 8) - within 10-15% at the entrance and 2-3% at the exit. Geometrical parameters of a calibrated cylindrical roller billet, p / s 42726 LM are within: Ovality, mm0.01-0.05 Taper, mm0.02-0.06 Roughness of the surface of the generator of the roller billet Not lower than 1.25 Force at landing of the end thickening is 100-120 t / s and a reduction force of 10-15 t / s. As a result of the reduction of the planted blanks by thickening forward at small degrees of reduction at the exit, billets are obtained with high geometrical accuracy and even ends, small allowances for polishing along the generatrix, which, in turn, leads to an elimination of the metal, small degrees of their reduction, the possibility of using carbide-tipped inserts with a favorable stress-state scheme, ensures a high durability of the die tool. calibration of cylindrical rollers blanks, especially large ones with a diameter of .30-500 mm, is carried out from chopped piece blanks, at the ends of which there are metal splittings, microcracks, burrs due to the destruction of the metal when chopping the rod into piece blanks, then the end parts of the blanks that have passed reduction, subject to machining.Cutting of the ends, chamfers and holes of the stamped billet rollers can be carried out by separate, one-sided turning; simultaneous double-sided turning, as well as simultaneous double-sided sequential polishing of the ends and chamfers. The base surface when machining calibrated roller blanks can be the surfaces of both the blanks and the extruded holes. The cutting of the end surfaces of the calibrated billet rollers eliminates the defects obtained during the previous processing, eliminates the defect on the stamping of the chamfers, and therefore ensures the high quality of the semi-finished product. Saving metal, enhancing the durability of a die tool, product quality and accuracy of dimensional and geometric parameters of cylindrical workpieces, as well as reducing the complexity of their manufacture, ensure high technical and economic efficiency of the proposed method. Claim 1. Method of calibration of cylindrical billet blanks, including reduction in a rigid matrix, characterized in that, in order to improve the accuracy of billets and the quality of products, a bar-shaped thickening is planted on one of the end parts of the billet on the side surface, and when reduced, the billet push the specified thickening forward. 2. A method according to claim 1, characterized in that the pushing of the workpiece during the reduction is performed by the following workpiece. Sources of information taken into account during the examination 1. Cold stamping. Reference, under. ed. Navrotsky G. A. and others. M., 1973, p. 153, fig. 15, 2. fmg 5 V FIG. 6 FIG. 0 /. FIG.