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 the lead-in cavity, the working cavity with the molding belt and a transition area from the lead-in cavity prior to molding of the belt and the guide cavity. The latter is made with a cylindrical section and a transition area of said cylindrical section to the forming belt of the working cavity. The surface of the transition section of the guide cavity is made convex radius, and paired with the surface of a cylindrical section at a tangent surface at an angle not more than 30o. The magnitude of the mating segment of the tangent is 0.1-1 mm, the radius of the generatrix of the convex surface is determined from the mathematical dependencies. The result is a hardening of the matrix and improve the quality of the parts. 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 Eskim plot from the lead-in cavity prior to molding of the belt, the guide cavity with a cylindrical section and a transition section from the cylindrical section to the forming belt, the maximum angle of the cone of the last transition area is 1/2o(Avenue of the NATIONAL MACHINERY company, the date of receipt on the company - 1996).

Known matrix is not adaptable to production, as it requires special equipment that provides the beating of the cone of the last transition area and shape of the belt is not more than 0.02 mm, exceeding the permissible values beating leads to curvature of the rod while pulling the workpiece.

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 a cylindrical section and a transition section from the cylindrical section to the forming belt, while the transition section of the guide cavity is made conical with an angle at the top of the 30o(Forging and stamping. Cold forging. Handbook edited by Navrotsky, A., I. 3. - M.: Mashinostroenie, 1987, S. 169, 170, Fig.3 is reduced blanks longer than ten diameters in the final strain rate varies from 0.5 m/s to 0, and direction of the forces acting on the workpiece is inverted, which leads to rupture of the liquid lubricant layer on the surface of the workpiece. The cone angle of the transition section 30odoes not provide pick-up and flow of the lubricant in the forming area of the belt, so while pulling the material sticks to the surface 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 resistance of the matrix by changing the surface shape of the transition section from a cylindrical section of the guide cavity prior to forming the band, as well as improving the quality of the parts.

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 and the guide cavity with a cylindrical section and a transition area of said cylindrical section to the forming belt, the surface of the transition section of the guide cavity from its cylindrical section to Foscolo section of the guide cavity tangentially to the surface, the angledto the surface of the cylindrical section of the guide cavity is not more than 30o.

The value of L the surface of the coupling convex part of the surface of the transition section of the guide cavity with its cylindrical section is 0.11 mm, and the radius R forming the aforementioned convex surface defined by the formulawhere D1- diameter cylindrical section of the guide cavity; d - the diameter of the forming belt;- the angle between the surface of the cylindrical section of the guide cavity and the surface of the mating convex part of the surface of the transition section of the guide cavity with the surface of the aforementioned cylindrical section; L is the size of the surface of the coupling convex part of the surface of the transition section of the guide cavity.

Thanks to a curved surface shape of the transition section of the guide cavity conserved protective lubricant coating by extrusion billet, resulting in significantly increased resistance of the matrix and improves the quality of the products after reduction.

The essence and 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, consisting of the transition section 4 and a cylindrical section 5 of diameter D1. The surface of the transition section 4 of the guide cavity from its cylindrical section to the forming belt working cavity is made convex on the radius R, and paired with the surface of the cylindrical section of the guide cavity tangent surface is angledto the surface of the cylindrical section of the guide cavity.

The value of L the surface of the coupling convex part of the surface of the transition section of the guide cavity may vary from 0.1 to 1 mm, the Angle mateis determined by the technical capabilities of the equipment used and methods of control of the Executive sizes and is not more than 30o. The radius of the convex surface R is calculated by a certain formula.

Matrix for the reduction works as follows.

The billet enters the lead-in cavity 1, and then deformed in a transitional phase 2 and adny section 4 and the cylindrical section 5. While pulling the reverse movement of the blank through a forming belt 3. During this transitional phase 4 creates a Crescent shaped wedge-shaped gap between the workpiece and a convex surface, thus providing the capture lubricant and feed it into 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. After working cavity, otremotirovannaya procurement goes without burrs and other surface defects.

Thus, the use of the proposed design matrix can significantly increase the tool life and the quality of the parts.

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 and the guide cavity with a cylindrical section and a transition area of said cylindrical section to the forming belt, characterized in that the surface of the transition section of the guide cavity from its cylindrical section to pornobrazil is and the guide cavity tangentially to the surface, the angledto the surface of the cylindrical section of the guide cavity is not more than 30.

2. The matrix p. 1, characterized in that the value of L the surface of the coupling convex part of the surface of the transition section of the guide cavity with its cylindrical section is 0.11 mm, and the radius R forming the aforementioned convex surface defined by the formula

where D1- diameter cylindrical section of the guide cavity;

d is the diameter of the forming belt;

- the angle between the surface of the cylindrical section of the guide cavity and the surface of the mating convex part of the surface of the transition section of the guide cavity with the surface of the aforementioned cylindrical section;

L - value of the surface of the coupling convex part of the surface of the transition section of the guide cavity.

 

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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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