SU1172635A1 - Method of producing hollow axis-symmetrical articles having two blind cavities - Google Patents

Abstract

The method of manufacturing hollow axially symmetric. Products with two main: chemical cavities, including placing a solid billet on the position of processing, leading to its ends coaxial mandrels, cross-wedge rolling of the billet and removing the mandrels, different from the coaxial mandrels, transverse wedge rolling of the billet and removing the mandrels, distinguishing itself with the same coaxial mandrels, cross-wedge rolling of the billet and removing from it the mandrels, with the coaxial mandrels; , each of the mandrels begin to be removed when the cross section of the end of the mandrel is aligned with the face formed by the intersection of the deforming wedge surface of the tool with its calibrating section. 2. The method according to claim 1, characterized in that, in order to expand the technological capabilities by obtaining deaf cavities with l helical grooves of the mandrel, rotate in opposite directions.

Description

I

vl

to

O5 00

sd

The invention relates to the processing of metals by pressure and can be used in the manufacture of products with blind cavities.

The purpose of the invention is to increase productivity, as well as expanding technological capabilities by obtaining blind cavities with helical grooves.

 FIG. 1 shows the workpiece (installed in the initial position); figure 2 - the same (intermediate stage rolling); on fig.Z - the same, (the final stage of rolling).

The method is carried out as follows.

Between the tools 1 with wedge gauges 2 (Fig. 1), the workpiece 3 is placed, with the mandrels 4 being pressed against the ends of the mandrel 4 by mechanisms 5, the mandrels being installed in the mechanisms with the possibility of rotation around its axis.

After that, by moving the tools with gauges 2 towards each other, the workpiece 3 is crimped.

Gauges .2 are in contact with the workpiece 3 with wedge surfaces (FIG. 2) of variable cross section, which, gradually wedging into the body of the workpiece, move the deformation zone from the middle part of the workpiece to its ends, causing the metal to flow into the free space between the tools 1, simultaneously encompassing mandrels 4.

In the intermediate stage of rolling, the billet takes the form of article 6.

In the final stage of rolling (Fig. 3), the finished product 7 is obtained. When in the cross section the deforming wedge tool surface is aligned with the end of the mandrel, i.e., the deformation zone is located directly above the mandrels 4, the mandrels gradually begin to be removed by the mechanisms 5, releasing the resulting blind cavities .

With the end of rolling, the mandrel 4 is completely removed from the cavities 8, and the finished product 7 is removed.

Tools 1 return to the starting position. A new preform is placed between them, and the process is repeated.

In order to obtain blind holes 8 with a surface in the form of helical grooves or internal threads

the mandrels 4 will rotate in the same or opposite direction with respect to the rotating workpiece 3, which provides for obtaining hollow cavities 8 with surfaces of a similar profile simultaneously with rolling the external surfaces of the workpiece 3 and eliminates additional operations for obtaining cavities 8 by the method. machining.

Example. The initial billet with a diameter of 35.345 mm and a length of 66 mm made of aluminum ADO or AD1 is clamped between the ends of the steel mandrels 4 and rolled. The total depth of the indentation of the wedge caliber is 12.5 mm, the length of the indentation of the wedge caliber is 41.3 mm, the central angle at the total depth of the indentation of the wedge caliber 123. The part rotates at a speed of 0.81 m / s; the metal under the action of the wedge gauges 2 spreads along the axis of the mandrels 4, thrusts on them, and the strain rate in the longitudinal direction depends on the angle of the wedge i averages 0.2-0.4 m / s. The start of rolling in 0.2 seconds, i.e. when the metal has passed 2/5 of the way, the extraction of the mandrels begins. The extraction force of the mandrels is 500 kgf without lubrication. The extraction force of the mandrels during lubrication with a small graphite powder is 40 kgf. The rolling time averages 0.5 seconds, taking into account the reverse idling of gauges of 250 mm length each and the loading and unloading times. The processing cycle is 2.53, 0s. After rolling, the products have the following parameters, mm;

Diameter of holes 13 Outer diameter 22 Depth of holes 79 mm (with

each side)

The total length of the workpiece is 224 mm. In the middle part of the billet, a jumper is obtained that is equal to the length of the original billet.

The productivity of the process is 12001500 pcs / h.

During the rolling of articles with internal thread, the process of forming the threaded holes occurs similarly to the process of rolling articles with smooth blind holes.

When the deformation zone is above the mandrels (in their threaded portion), the extraction of the mandrels begins. Moreover, in the process of rolling, the mandrels first rotate freely along with the preparation due to the efforts of friction, and when the deformation zone moves to the threaded part, forced rotation is attached to the mandrels: one in the opposite direction and the other in the same direction i RI with respect to the workpiece, depending on which side of the rotating workpiece they are, i.e. the mandrels are unscrewed from the workpiece. When the deformation process is complete, the mandrels are completely removed, and the resulting threaded holes for increased 5 Accuracy can be further calibrated.

Dp of manufacturing a product with an internal thread, for example Ml2, the blank is used almost the same size as in the manufacture of a product with smooth blind holes of 13 mm diameter.

Dp for obesity products with parameters, mm;

Outer diameter 22

Bore diameter 12

Length (depth J holes 79 (each side)

The hedge should be 72.4 mm long and 37.3 mm in diameter.

The invention provides productivity increases in the manufacture of products with blind cavities, as well as the expansion of the technological capabilities of the method by obtaining blind cavities with helical grooves.

Removing the mandrels when the deformation zone is above their ends helps the metal flow in the axial direction and reduces the rolling force, reduces the time of auxiliary operations for extracting the mandrels and contributes to the accuracy of the holes by eliminating the taper, which is inevitable with the known method. The wear of mandrels is significantly reduced due to sliding friction of the product on the mandrels when they are removed.

/.

FIG. 2

(pus. 3

Claims (2)

METHOD FOR MAKING HOLLOW AXISYMMETRIC PRODUCTS WITH TWO DEPTH • CHEMICAL CAVITIES, including placing a continuous workpiece in the processing position, bringing coaxial mandrels to its ends, wedge rolling and removing mandrels from it, characterized in that, with the aim of , each of the mandrels begins to be removed when the cross-section of the end face of the mandrel is aligned with the face formed by the intersection of the deforming wedge surface of the tool with its calibrating section. 2. The method of pop. 1, with the fact that, in order to expand technological capabilities by obtaining blind cavities with helical grooves, the mandrels are rotated in opposite directions. . SU .1172635