# Hard alloy matrix for heading multifaced items

FIELD: metal working.

SUBSTANCE: hard alloy matrix has casing, bushing pressed in the case and hard alloy insertion. Bushing has multifaced hole. Hard alloy insertion is composed by several sections made in form of trapezoidal-section prisms which have cut angles at their non-working edges. Number of sections corresponds to number of faces of item to be headed. Cuts of angles are made symmetrically to faces of working edge. Slits are made in several places of multifaced hole bushing at the ponts where faces cross each other.

EFFECT: improved resistance of matrix; simplified assembly.

3 cl, 1 dwg

The invention relates to the field of metal forming and can be used in the manufacture of polyhedral parts, such as nuts.

Known carbide matrix for the landing faceted products, made in the form of a shroud covering sleeve with pressed therein carbide insert, consisting of separate sections, the number of which corresponds to the number of faces of the landed product, and the partition insert is made in the form of prisms of trapezoidal cross-section with cut corners on the outside of the ends (as the USSR №489576, CL 21 j 13/02, 1976).

The disadvantage of a matrix is its low resistance, because after prolonged use of this matrix there is a deterioration of the Central part of the working faces of the sections, resulting in a matrix fails. In addition, because of the presence of stress concentrators in the corners of the polyhedral holes in the sleeve it is destroyed under the influence of the variables of the dynamic loads transmitted to it by the sections for stamping. To increase the resistance of the sleeve, and hence the matrix is necessary to balance the tensile stress, which is necessary to increase the dimensions of the sleeve and the housing, which in some cases is unacceptable.

The disadvantage is the complexity of the composite Assembly of an insert sleeve, so as technologically difficult is to suscestvitel the coupling sleeve through a multi-faceted inner surface of the hole with composite insert, made in the form of sectors, which during the pressing of the composite insert in the sleeve occurs the marriage in the form of skewed sectors relative to each other.

The closest in technical essence to the present invention is carbide matrix for the landing faceted products containing clip, pressed into her sleeve with the multifaceted hole, covered by the sleeve carbide insert, consisting of separate sections, made in the form of prisms of trapezoidal cross-section with cut corners on the outside of the ends, while the number of sections corresponds to the number of faces of stocked products, and sliced corners have symmetrical faces working end (A.S. USSR №564071, CL 21 j 13/02, 1977).

This matrix has a low resistance bushing due to the presence of hubs in the voltage angles of the polyhedral holes in the sleeve, which is destroyed under the influence of variables dynamic loads for stamping. In order to avoid destruction of the bushing, it is necessary to increase the dimensions of the sleeve and the housing.

In addition, the disadvantage is the complexity of the Assembly is carried out by pressing of the composite insert in the sleeve, so as technologically difficult to implement the coupling sleeve through a multi-faceted inner surface of the hole with composite insert, made in separate sections.

The objective of the invention is to increase the resistance of the matrix by increasing the resistance of the sleeve, and also simplify the Assembly of the matrix.

This problem is solved by the fact that the matrix containing the cage, pressed into her sleeve with the multifaceted hole, covered by the sleeve carbide insert, consisting of separate sections, made in the form of prisms of trapezoidal cross-section with cut corners on the outside of the ends, while the number of sections corresponds to the number of faces of stocked products, and sliced corners have symmetrical faces working end, according to the invention in the sleeve with the multifaceted hole at the intersection of the edges in several places made the cut.

Performing two or more slit in the sleeve, we get rid of stress concentrators in its corners, which increases its resistance. Greatly simplifies the Assembly of the matrix, a process which will only consist in the insertion of pre-assembled split sleeve and the composite insert in the case of the cylindrical surface. This eliminates the process of pressing the insert into the sleeve.

For technological reasons, ease of Assembly of the bushing and the composite pie paste, and on the basis of lowest complexity of manufacturing bushings of the number of incisions should be at minimum two opposite corners of sasthra the aqueous holes in it.

In addition, the use of a split bushing design makes it possible to reduce its thickness and to avoid its destruction, thus reducing bushing material by reducing its size, and to reduce the dimensions of the matrix.

The drawing shows the proposed matrix.

Carbide matrix for the landing of polyhedral products consists of a casing 1, a split sleeve 2 with the multifaceted hole, carbide inserts 3, consisting of separate sections, made in the form of prisms of trapezoidal cross-section with cut corners on the outside of the ends. The number of sections corresponds to the number of faces of stocked products, and sliced corners have symmetrical faces working end.

1. Carbide matrix for the landing of polyhedral products containing clip, pressed into her sleeve with the multifaceted hole, covered by the sleeve carbide insert, consisting of separate sections, made in the form of prisms of trapezoidal cross-section with cut corners on the outside of the ends, while the number of sections corresponds to the number of faces of stocked products, and sliced corners have symmetrical faces working end, wherein the sleeve with the multifaceted hole at the intersection of the edges in several places made the cut.

2. The matrix according to claim 1, characterized in that in Ulke with the multifaceted hole at the intersection of the faces in two places made the cut.

3. The matrix according to claim 1, characterized in that the number of sections corresponds to the number of faces.

**Same patents:**

FIELD: metal working.

SUBSTANCE: hard alloy matrix has casing, bushing pressed in the case and hard alloy insertion. Bushing has multifaced hole. Hard alloy insertion is composed by several sections made in form of trapezoidal-section prisms which have cut angles at their non-working edges. Number of sections corresponds to number of faces of item to be headed. Cuts of angles are made symmetrically to faces of working edge. Slits are made in several places of multifaced hole bushing at the ponts where faces cross each other.

EFFECT: improved resistance of matrix; simplified assembly.

3 cl, 1 dwg