Matrix for reduction

 

The invention relates to the processing of metals by pressure, in particular for cold-formed instrument, and can be used in the manufacture of core products. The matrix contains lead, the working and the guide cavity. The working cavity made with forming belt and a transition area from the lead-in cavity prior to forming the band. The surface of the transition section is made concave radius, and paired with the surface of the forming belt on a tangent surface at an angle of 30-60oto the surface of the forming belt. The magnitude of the tangential surface of the transition section is 0.1-1 mm Radius forming the concave surface is determined from the mathematical dependencies. The result is a hardening of the matrix. 1 C.p. f-crystals, 2 Il.

The invention relates to the processing of metals by pressure, namely the cold instrument, and can be used in the manufacture of core products.

Known matrix for reduction, lead-containing cavity, the working cavity with the molding belt and transitional conical section from the lead-in cavity prior to forming the NATIONAL MACHINERY we, date on which the company 1996).

Known matrix does not have sufficient durability.

Closest to the invention by the combination of essential features is the matrix for reduction, lead-containing cavity, the working cavity with the molding belt and a transition area from the lead-in cavity prior to molding of the belt, the guide cavity, with the transition portion of the cavity is made conical with an angle at the vertex of not more than 30o. (Forging and stamping. Cold forging. Handbook edited by Navrotsky, A., T. 3 - M.: Mashinostroenie, 1987, S. 169, 170, Fig.39B).

Such a matrix has a low resistance, since the reduction of blanks on the cold landing slots at the length of the blanks more than ten diameters of the rate of deformation varies from 0.5 m/s to 0, what happens to the rupture of a liquid lubricant layer on the surface of the workpiece. Therefore, when the pressure reduction and ejection of the workpiece material sticks to the surface of the forming belt of the working cavity of the matrix, there are burrs on the surface of the workpiece and the tool, which reduces the tool life and poor quality parts.

The invention solves the problem of increasing with whom and before forming the band.

The problem is solved by the fact that the matrix for reduction, lead-containing cavity, the working cavity with the molding belt and a transition area from the lead-in cavity prior to molding of the belt, the guide cavity, the surface of the transition section from the lead-in cavity prior to molding of the belt is made concave on the radius R, and paired with the surface of the forming belt on a tangent surface is angledto the surface of the forming belt, constituting 3060o.

The value of L is tangent to the surface of the transition section is 0.11 mm, and the radius R forming the concave surface defined by the formula:where D is the diameter of the lead-in cavity; d - the diameter of the forming belt;- the angle between the tangent surface of the transition portion of the cavity and the surface of the forming belt; L is the magnitude of the tangential surface of the transition section.

Thanks to a curved shape of the surface of the transition portion of the cavity conserved protective and lubricating coating in E. the project, the General view in the context of Fig.2 - part a of the matrix.

Matrix for reduction contains the lead-in cavity 1 of diameter D, the working cavity, consisting of the transitional phase 2 and forming belt 3 with a diameter d, the guide cavity 4. The surface of the transition section 2 from the lead-in cavity prior to molding of the belt is made concave on the radius R, and paired with the surface of the forming belt 3 at a tangent surface is angledto the surface of the forming belt.

The value of L is tangent to the surface of the transition section may vary from 0.1 to 1 mm, the Angle3060o. When<30 is to increase the area of deforming surfaces and substantially increase efforts to overcome the forces of friction, and when>60increase efforts to deformation of the material, which leads to upsetting of the billet at the entrance to the matrix. The radius of the concave surface R is calculated by a certain formula.

Matrix for the reduction works as follows.

Zakatnogo wedge gap between the workpiece and the concave surface is captured lubricant and submitting them to the forming area of the belt, that guarantees the preservation without gaps protective and lubricating coating and prevents the build-up of material on the surface of the matrix. Next, the workpiece is calibrated, passing through a forming belt 3, and is fed into the guide cavity 4. After completion of the reduction process produces the ejection of the workpiece in the opposite direction through a forming belt.

The use of the proposed design of the matrix will increase the tool life due to the modified shape of the surface of the transition portion of the cavity.

Claims

1. Matrix for reduction, lead-containing cavity, the working cavity with the molding belt and a transition area from the lead-in cavity prior to molding of the belt, the guide cavity, characterized in that the surface of the transition section from the lead-in cavity prior to molding of the belt is made concave on the radius R, and paired with the surface of the forming belt on a tangent surface is angledto the surface of the forming belt, constituting 3060.

2. The matrix p. 1, wherein the us R forming the concave surface defined by the formula

where D is the diameter of the lead-in cavity;

d is the diameter of the forming belt;

- the angle between the tangent surface of the transition portion of the cavity and the surface of the forming belt;

L - value of the tangential surface of the transition section.

 

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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

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