RU2496598C2 - Method of making forged variable-section vanes with two butts - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to metal forming and may be used in aircraft engineering for making billets of vanes with two butts or with one butt and retaining flange. Heated billet is placed in container between two half-female dies of the mould with channel. Note here that part of the billet is arranged at lower male die to deform the billet so that neck is formed by closing of said half-female dies. Then, one of buts is formed by displacement of lower male die upward after stopping said half-female dies. Billet is extruded via mould channel by upper male die at displacement of lower male die downward. Note here that billet part is left in container to form variable-section forged piece diverging toward billet part left in said container.

EFFECT: expanded range of forged pieces, higher metal use factor, higher strength.

2 dwg

Description

The invention relates to the processing of metals by pressure and can be used in the aviation industry in the manufacture of blade blanks with two shanks or with one shank and retaining shelf.

There is a known method of manufacturing blades with two shanks, which includes heating in an induction installation, rolling on forging rollers for four transitions, heating in a gas furnace for disembarkation on the gas-condensate mill for three transitions, heating of a shaped workpiece in a gas rotary kiln for subsequent stamping (A. Atroshenko. P., Fedorov V.I., Hot stamping of hard-to-deform materials. - L., Mechanical Engineering, Leningrad Department, 1979, 287 pp., Pp. 87-88).

The disadvantage of this method is the large number of deforming tooling (dies for upsetting, forging rollers) and technological equipment (gas condensate mills, rollers), as well as a large number of heating operations that do not allow to obtain the desired structure of the blade.

The closest is a method of manufacturing compressor blades with two massive shanks and a thin feather that includes blank casting, heating and isothermal stamping (Patent No.2019359 V21K 3/04 of 11/14/1991, publ. 15/09/1994).

The disadvantage of this method of manufacturing vanes with two shanks is the restriction on the use of cast alloys only, as well as an increase in the complexity in connection with the use of the casting operation.

The technical result achieved by the implementation of the invention is the ability to obtain blanks for stamping blades with two shanks of variable cross section with a fiber structure directed along the product, approaching the finished product by first forming one of the shanks of the blade with a lower punch for the desired type of shank and then extruding it, which leads to to save metal and increase the range of stampings obtained.

The technical result is achieved by the fact that the heated preform is installed in the container between the semi-matrices of the composite matrix made with the channel, with the location of the part of the preform on the lower punch, the workpiece is deformed with the formation of the neck by closing the semi-matrices of the composite matrix, then one of the shanks of the blade is formed by moving the lower punch up after stop the half-matrix of the composite matrix, squeeze the workpiece through the channel of the composite matrix with the upper punch when the lower punch moves to the lower position, This portion of the preform is left in the container and formed stamping variable section, widening towards the remaining part of the container preform.

The figures show:

Figure 1 - The formation of one of the shanks of the scapula.

Figure 2 - Extrusion of blanks of variable cross-section under the blade with two shanks.

The essence of the proposed method is as follows. The heated cylindrical billet is installed in the container 1 between the half-matrices 2, 3 of the composite matrix made with the channel. The workpiece is set so that part of the workpiece is located on the lower punch 4 (Figure 1).

The workpiece is deformed to form a neck by closing the semi-matrices 2, 3 of the composite matrix. Closing of the semi-matrices 2, 3 of the composite matrix is due to the kinematic connection between the wedges 5 and the press slider. Wedges 5 begin to move down, and half-matrices 2, 3 begin to move, deforming the workpiece. The dimensions of the neck are determined based on the dimensions of the minimum section of the scapula (Figure 1).

Then one of the shanks of the blade of the required size (Example) is formed by moving the lower punch 4 upward after stopping the half matrixes 2, 3 of the composite matrix.

Next, the workpiece is squeezed out through the channel of the composite matrix by the upper punch 6. In this case, the wedges 5 move upward, forming a gap between the half-matrices 2, 3 of the composite matrix and the wedges themselves 5. Under the action of the deformable metal, the half-matrix 2, 3 are moved apart by the size of this gap. The lower punch 4 is moved to the lower position, while part of the workpiece remains in the container 1 (Figure 2).

A stamping of variable cross section is formed, expanding towards the remaining part of the workpiece in the container 1 (Figure 2).

As a result, it is possible to obtain blades with two shanks with a fibrous structure directed along the product without the use of a large number of technological transitions, that is, the nomenclature of the technological tool is reduced, as well as the high mechanical characteristics of the finished product.

During this process, stamping of variable cross section under the blade with two shanks is obtained, which is close in shape to the finished part.

Claims (1)

A method of manufacturing stampings of variable-section vanes with two shanks, characterized in that the heated preform is installed in a container between two half-matrices of a composite matrix made with a channel, with the location of a part of the workpiece on the lower punch, the workpiece is deformed to form a neck by closing the semi-matrices of the composite matrix, then formed one of the shanks of the blade by moving the lower punch up after stopping the half-matrix of the composite matrix, squeeze the workpiece through the channel of the composite matrix of the upper with the punch during the movement of the lower punch to the lower position, while part of the workpiece is left in the container and forming a stamping of variable cross section, expanding towards the remaining part of the workpiece in the container.

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