Composite matrix

 

(57) Abstract:

The invention relates to equipment for processing of metals by pressure, particularly to constructions composite cylindrical matrices with shroud ring. Composite matrix contains a matrix and set it with tightness and conjugate on the surface of the retaining ring. The mating surface of the matrix or of the retaining ring is made curved. The shape of the curved surface is determined from the provision in the operating mode of a comprehensive uniform compression of the matrix over the entire height. The amount of tension is determined from the ratios. The result is increased strength and durability of the matrix. 6 Il.

The invention relates to equipment for processing of metals by pressure, and specifically to the design of composite cylindrical matrices with shroud ring.

Known [1] - [3] design matrix in which to increase the resistance provided by the creation of the preliminary compression stress due to compression of the matrices of the retaining ring taken us as analogues.

However, in the above matrix does not contain any information about the ratio of the major dimension values socolescu cover the design area of this type of devices.

Of these analogues closest to the technical nature of the proposed design is a bandage for matrices [1], we have adopted as a prototype.

The main disadvantages of the prototype [1] are:

1. The inner surface of the retaining ring is cylindrical, therefore, the nature of voltage changes according to the height of the matrix remains unaccounted for.

2. Not taken into account the fact that the shear stresses that are causing destruction are not the greatest on the surface of the matrix, where external force is applied, and in some depth.

3. Not taken into account the fact that excessive tightness, i.e. overload matrix preliminary compressive stresses from the side of the retaining ring is also harmful, as well as underutilization.

4. The thickness of the retaining ring (set of retaining rings) is appointed without sufficient justification, resulting construction is weighted.

The objective of the invention is to provide a new cylindrical matrix, providing the technical result consists in the fact that the strength and resistance of the matrix of the proposed design is many times greater than analogies matrix, containing a matrix and set it with tightness and conjugate on the surface of the retaining ring, the mating surface of the matrix or of the retaining ring is made curved, the shape of which is determined from the condition of security in the operating mode of a comprehensive uniform compression of the matrix over the entire height.

In Fig.1 shows two variants of the composite matrix Assembly when heated shroud ring; to the left, curvilinear forms created on the retaining ring, right in the matrix.

The ability to create composite matrix significantly increased strength is based on the use of the following properties of solid deforming body.

When considering the behavior of two identical solid samples, for example, a cylindrical shape, Fig. 2, one of which is on the plane, and the other is inserted into the hole without gaps, intuitive feel for the destruction of the second sample will require a much greater load. Indeed, calculations show that if the material forming the hole, absolutely rigid, then the maximum load in the second case, is 1.5 times higher.

The reason for the increase in ultimate load is the appearance of stress2and32and3levels1one , the maximum load will be equal to infinity. In other words, a solid body, every point of which is in a state of all-round compression, it is impossible to destroy.

The idea of creation in the matrix pre-compression using the retaining ring is known. However, the existing configuration does not provide in the operating mode of the creation of a comprehensive matrix compression, resulting in such matrices is still destroyed.

Research has shown that axial tensionz, Fig.3, are greatest at the surface at the point of application of load q. However, due to the presence of radial rand districtvoltages which are equal to each otherr=dangerous point, as can be seen from Fig 4, is a point located on the axis Z at a certain depth, where the greatest shear stresses, which are the cause of destruction. In Fig.4 used relative values

< / BR>
where P is the force of the press; - the radius of the circular spot of the overflow.

The influence of the value of the additional voltage pre-compression stress qCRpresented on Fig.5, where indicated

< / BR>
DG is trimsamsa to infinity in = China 0,686, shear stresses are equal to zero. The increase in pre-compression by creating unnecessary tension, as can be seen from the drawing, is accompanied by increasing tangential stresses of opposite sign, which leads again to the weakening of the matrix.

A curved surface in the contact zone of the matrix and rings, Fig.1 must correspond to the nature of the shear stress shown in Fig.4. Variable height matrix tightness is determined by the formula:

< / BR>
where

< / BR>
< / BR>
- tightness, cm;

- axial stress, MPa;

rradial stress, MPa;

E - the modulus of longitudinal elasticity, MPa;

the q - value of the external load, MPa;

the ratio of transverse strain;

a is the radius of a matrix, see (Fig.1);

b is the outer radius of the retaining ring, cm (Fig.1);

c is the radius of the circular spot Burr, cm (Fig.3);

z is the longitudinal coordinate, cm (Fig.3).

Tension can be created not only due to the variable profile of the retaining ring for the rectilinear generatrix of the matrix, but on the contrary, due to the variable profile matrix, Fig.1, when a rectilinear generatrix of the bandage.

In Fig.6 presents the dependence of the radial stressrand OK is their thickness in excess of the ratio b/a>22,5 has had little effect.

Described the proposal involves an inventive step, since the receipt of the indicated technical result is not obvious to a person skilled because the above-mentioned features of the invention are based on the special mechanics of solid deformable body. This object is achieved in that in the composite matrix by pre-compression in the working mode is created the same along the entire height of the stress state of all-round compression.

Certainly is the significant effect of increasing the strength of the matrix described manner, since it is based on the obvious truth, which is that by means of all-round compression solid body it is impossible to destroy.

The invention is industrially applicable: it can be used in forging, stamping and other departments involved in the processing of metals by pressure at machine-building plants.

Sources of information

1. USSR author's certificate 483185, 1975

2. B. N. Romanovsky. Handbook of cold stamping. M.: mechanical engineering, 1979, page 459 -461

3. S. P. Timoshenko, J. Hudler. Theory of elasticity. M: Fizmatgiz, Moscow, 1979, pp. 404-409.

Composite matrix containing macrochaeta the surface of the matrix or of the retaining ring is made curved, the form of which is determined from the condition of security in the operating mode of a comprehensive uniform compression of the matrix over the entire height, and the amount of tension is determined from the following equation:

< / BR>
where

< / BR>
< / BR>
where is the tension, cm;

z- axial stress, MPa;

rradial stress, MPa;

E - the modulus of longitudinal elasticity, MPa;

the q - value of the external load, MPa;

the ratio of transverse strain;

a - the radius of a matrix, cm;

b is the outer radius of the retaining ring, cm;

with the radius of the circular spot Burr, cm;

z is the longitudinal coordinate, see

 

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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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