Device for shaping of thin-wall axisymmetrical parts of flattened converging shape

FIELD: metallurgy.

SUBSTANCE: in a device containing a puncheon, a cone, a support ring, extension-type sectors, a matrix, an elastic element located between the extension-type sectors and the matrix; the extension-type sectors have different conical surfaces. The inner surface has an inclination angle of a generatrix that is larger than an external one.

EFFECT: improving the quality of parts without their faceting per a pass of a press; reducing labour input.

2 dwg

 

The invention relates to a cold sheet metal forming, in particular to the forming of thin-walled axisymmetric shells, and can be used in the manufacture of large-size thin-walled parts tapering truncated form on presses double action.

A device for forming an axisymmetric shrinking membranes (A. S. 755378 the USSR, MKI 4 B21D 22/10, publ. 1980, bull. No. 30), which sequentially deform the workpiece in the form of directed waves. Scheme of the process is performed within one stroke of the press when using the punch consisting of an annular elastic elements (washers) with different compression characteristics, i.e. with variable stiffness compression. In the upper part of the punch should be elastic washer with a higher hardness and the size of the punch in the original position must ensure the growing up the gap between the workpiece and punch. The necessary increase in stiffness in the upper part of the punch is achieved through the use of harder grades of elastic environments or reducing the thickness of elastic washers with the production between the metal strips. In the process of molding the parts that plug into each given time deforms a small area of the workpiece with dimensions that do not allow buckling. Hour�ü blank below this area is already molded and pressed by the elastic medium to the matrix, and the upper part is still not in contact with the punch. She is in the process of forming freely pulled into the zone of deformation, which reduces wall thinning parts and increases the maximum degree of deformation of the workpiece for one transition. However, it is possible for fine cutting stability loss of the free part, as it is deformed under conditions of stress-deformed scheme, similar to the process of drawing, where there are compressive Hoop stress.

The disadvantage of this device is the need for significant additional effort of forming the large area of the elastic medium by the application of force for shaping. In addition, the presence of friction forces of compression between the workpiece and the elastic medium for thin-walled workpiecesSzagD0,008(where Szag- the thickness of the workpiece; D - average diameter) leads to wrinkling and formation of corrugations of the workpiece.

The closest in technical essence is a device for forming thin-walled rotationally symmetrical parts of a truncated tapered shape (Patent for invention 249398, IPC B21D 41/02, B21D 22/02, publ. 27.09.2013). The device consists of a punch rigidly connected with the matrix, the elastic element in the form of a conical shell, sliding sectors cone with guide grooves of the support ring, studs installed in the platen press.

The disadvantage of this device is the unregulated movement (left, right, down, up) sliding sectors, namely, that there is a need of repeating the process with the subsequent reinstallation of the workpiece, which leads to increased complexity, additional costs of electricity.

The object of the invention is to obtain high-quality thin-walled axisymmetric narrowing of parts without cut per stroke of the press.

The task is achieved by the fact that the device for forming, containing the punch, cone, support ring, sliding sectors, the matrix, the elastic element located between the sliding sectors and the matrix, with the oblique, the outer surface of which passes through a point of the working surface of the matrix with the largest and smallest diameters, according to the invention the sliding sector is carried out with different conical surfaces, wherein the inner surface has an angle of taper greater than the outside, and satisfies: α1=10-20°; α2=2-30°,

where α1- the angle of the outer surface of the sector;

α2- the angle of the inner surface of the sector.

The task is achieved by a device which is schematically shown in Fig.1, Fig.2 is a section along a-A.

Device for molding consists of a punch 1, rigidly connected with the matrix 2, the elastic element 3, the sliding sectors 4, obtained from a conical shell by splitting it along its generatrix equal parts, the inner surface of which has an angle of inclination greater than or equal to the angle of inclination of the generatrix of the outer surface of the cone 5, the support ring 6, pins 7, installed in the press plate 8. Item 9, the workpiece 10.

The device operates as follows. The support ring 6 is lifted up. Punch matrix allotted up to a height that enables the installation of the workpiece 10. Sliding sector 4 is lifted up together with the elastic element 3. In this position, set the cone on top of the workpiece elastic element. Further down the punch with the matrix up to the stop on the support ring 6. While the work surfaces in the elements of greatest and least diameters of the elastic element applies. The working surface of the matrix hmheight greater than the height of the workpiece hWa height of the elastic element of hEequal to the height of the matrix h. When the movement of the punch down togeth�e with it lowered and the matrix 2, overcoming resistance to the sliding of the sectors 4 and the elastic element 3 together with the workpiece 10. Sectors, falling down on the cone 5, the increase in diameter. The increase in diameter and the elastic element, which begins to deform by pressure from within the workpiece tightly against the working surface of the matrix. Received item 9 is removed by lifting the first punch and the matrix, and then the support ring 6. To facilitate the ascent of the sliding sectors up, the angle of inclination α2on the surface of contact between the inner surface of the sliding sectors and the working surface of the cone must be greater than the coefficient of friction, i.e., f2≤tgα2(or f2<0,35).

The peculiarity of this design of the device that received the item devoid of cutting and its outer surface coincides with the working surface of the matrix, which eliminates the additional step of calibration.

The device must meet the following criteria. To avoid increasing the diameter of the elastic element of its reduce height and appearance on the surface of the workpiece contact compressive forces of friction, which can lead to loss of stability of thin-walled workpiece, the elastic member in the areas of greatest and least diameters of the matrix is clamped (at the initial time) between the matrix � sectors. To ensure the conditions of the elastic clip element it is necessary that its height was greater than the height of the working surface, but did not exceed the overall height of the matrix, otherwise the elastic element may enter the gap between the matrix 2 and 4 sectors. The presence of the angle of the taper on the outer surface of the elastic element and the workpiece α1less coefficient of friction f1makes it impossible to slide the workpiece. It must be performed, the condition f1≥tgα1(or f1>0,35). It is necessary to provide for an elastic element on its inner surface and the outer sliding surfaces of the sectors for the absence of slippage of the elastic element by sector.

The elastic element is deformed, increases the diameter and decreases the thickness, that is, corresponds to the condition of plane strain state when the deformation through the thickness εSequal in magnitude and opposite in sign of the strain of increasing the diameter of the elastic element εθ.

The device allows you to get high-quality, thin-walled, axially symmetric narrowing of parts without cut per stroke of the press, reduce the complexity of manufacturing and the cost of electricity.

A device for forming thin-walled rotationally symmetrical parts tapering truncated form containing the punch, �onus, support ring, sliding sectors, the matrix located between the sliding sectors and matrix elastic element forming the outer surface of which passes through a point of the working surface of the matrix with the largest and smallest diameters, characterized in that the sliding sectors performed with different conical surfaces, and forming an inner conical surface sectors performed with a tilt angle equal to α2=20-30° greater than the angle of inclination of the generatrix of the outer surface of the sectors is equal to α1=10-20°.



 

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