A method of manufacturing an axisymmetric forging products

 

(57) Abstract:

Usage: in the field of metal forming in the manufacture of axisymmetric products, for example, gears, wheels, discs, etc., the inventive preparation is placed in a stamp of the first transition, including the matrix and the punch, moving spinning. this transition produces the receipt of the material with a relief on one side, facing the matrix, by performing combined operations precipitation, exhaust flange and calibration. The dimensions of the semi-finished product obtained from the above relations. Then stamp the final transition produce the formation of a relief on the other side of the semi-finished product, subjecting the deformation originally formed by the relief on the same side, as on the first transition. 1 C.p. f-crystals, 5 Il.

The invention relates to the processing of metals by pressure and can be used in various engineering industries in the manufacture of axisymmetric products, such as gears, wheels, disks and similar products.

Known methods and devices [1] for the manufacture of axisymmetric product type wheels, in which a workpiece in the form of a rod consistently rebuff carry out here, due to the large number of stamping transitions, and low precision forgings.

Closest to the present invention is a method of manufacturing an axisymmetric forging products [2] including upsetting, forming bilateral relief, the hood flange and calibration. In the precipitation process of the workpiece carry out the shaping of relief on one side and the hood flange by running from the side of the workpiece facing to the end face of the punch. The resulting intermediate product base in the matrix formed by the relief, followed by extrusion of relief on the other side of the flange and the formation of the hub. During extrusion, the billet is calibrated on the outer diameter of the expiry of the excess metal in the hub.

The implementation of this method occurs in conditions of high specific efforts deformation, which reduces the resistance of the molding tool. Technological possibilities of the method is limited to a maximum height of the workpieces (h0/d01,8-2,0) and depth obtained from the matrix of relief hp3-4 mm. used in the known method blanks larger diameter is associated with increased complexity and additional >2d0) leads to loss of longitudinal stability of the workpiece in the sediment and subsequent misalignment of the flange.

To solve the problem in the known method of manufacturing the asymmetrical forging products, mainly the wheels, including the production of semi-finished product with a relief on one side by performing one stamp combined operations precipitation and exhaust flange, the subsequent forming of the material with the formation of the relief on the other side in the final stamp of transition and calibration, on the first transition receive the semi-finished product with dimensions determined from the following relations:

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where hcthe extension of the hub of the material;

A1, A2the depth of the cavity of the semi-finished product and of the product;

H1H2hub height of semi-finished products and products;

h1h2height bury in the matrix part of the hub semi-finished products and products;

t1the thickness of the fabric material;

Vf2the volume of the flange of the product;

hp1hp2the relief depth of semi-finished products and products;

Df1Df2the diameter of the flange of the semi-finished product and of the product;

D1D2the diameter of the relief of the semi-finished product and of the product;

ds1and ds and the hub of the semi-finished product, numerically equal: when Polygonatum deformation (800oC) Z=0.5 mm, by cold deformation Z=0,25 mm

d2b2the diameter and the depth of the upper layers of the cavity;

d1the diameter of the lower cavity of the hub of the product;

the absolute increase in the depth of the relief,

and the terrain from the side adjacent to the matrix stamp, which is subjected to deformation in the stamp final passage on the same side, as on the first transition, and the calibration is carried out on the first transition.

A draft of the workpiece on the first transition is produced with double-sided centering of the workpiece.

In Fig. 1 presents one embodiment of the implementation of this method (getting axisymmetric products by forging two transition: left: the original position of the workpiece, right after forming the blank into a semi-finished product); Fig. 2 left shows the material after the first transition, the right finally made product; Fig.3-5, respectively, of the original procurement, the semi-finished product and the product.

The method is as follows.

The source of the workpiece 1 is installed in one of the ends into the cavity of the matrix 2 with emphasis on the ejector 3 and the other of orhni the end face of the workpiece 1 is centered in the cavity of the punch 4, moving spinning at an angle g relative to the end face of the workpiece. Due to the fact that both ends of the workpiece strictly mounted in a forming tools, further sediment harvesting occurs without curvature of its longitudinal axis. Here, the height (h0) more (1,8 2,0)d0where d0-the initial diameter of the workpiece. When moving matrix 2 carry out the shaping of relief from matrix 2, the simultaneous design of the flange 5 and the hub 6 and the calibration. In the result of the combined impact of the punch, die and ejector receive the semi-finished product 7 shown in Fig.4 with the sizes determined from the ratios.

At the second transition (Fig. 2) semi-finished product 7 install in matrix 8 of the second transition with a given relief, aligning extruded on the first transition cavity in the hub 6 on the ejector 9. After that, the punch 10 with a given relief perform the final shaping of the product.

In the initial stage of the drift-pin strengthening 11 of the plug 10, leading to pressure on the Central part of the hub of the semi-finished product 7, produces a partial squeezing of the cavity and the design of the lower part of the hub-side of the matrix (Fig.2). When the punch 10 comes into contie relief on the flange side of the punch and die. Due to the fact that the depth of the relief material (hp1) greater than the depth of the relief items (hp2by the amount of (()), the shaping of the flange is R the result of performance cloth 12, which reduces the required deformation force. It is found experimentally that for hp26 mm, (2,0 2,5) mm, and for hp2> 6 mm, D (1,5 2,0) mm This effect prevents premature filling of relief from the punch 10 and contributes to the favorable redistribution of flowing metal in the corner areas And from the matrix (Fig.2). This greatly facilitates the working conditions of the tool and increases its durability. The process of forming the semi-finished product continue up until the drift-pin strengthening 11 of the plug 10 when moving on the value of Z2will not carry a complete extrusion cavity in the hub to a predetermined depth (b2), which corresponds to the maximum elongation of the hub, is equal to: . This time corresponds to the full execution of the relief on the flange side of the matrix 8 and the plug 10 when the total displacement matrix 6 by the value of Z1equal to the displacement of the drift-pin strengthening 11, i.e., Z1Z2.

This pattern of deformation and shape of polugar is a dumbass. This allows you greatly reduce the efforts of the deformation, increase tool life and provide high quality products due to better fill the engraving of the stamp.

Example. The original billet of steel NA-W dimensions d0=45 mm, h0=137 mm set in a matrix aligning one of the ends of the ejector and the other in the cavity of the punch.

On the first transition receive the semi-finished product dimensions: Df1132 mm, H140 mm, hp18 mm, ds146 mm, A112.5 mm, h122.5 mm, 45of19.5 mm, t17 mm

Modes of formation: P 1700 kN, V012 mm/s, S01.8 mm/Rev, g 2oT 800oC t 10 S.

On the second transition of the resulting intermediate product is installed in a matrix aligning the cavity depth equal to A112.5 mm, ejector. Subsequent deformation is carried out with the following parameters: P 1850 kN, V012 mm/s, S01.8 mm/Rev, g 2oT 800oC t 5 c.

In the shaping gain product dimensions: Df2134 mm, D1103 mm, ds249 mm, d122 mm, d232 mm, hp25.5 mm, AND221.5 mm, H249 mm

Compared with the prototype of the proposed method is the instrument, significantly expand the range of stamping parts, and to reduce material consumption by 2.1 times.

1. A method of manufacturing the asymmetrical forging products, mainly the wheels, including the production of semi-finished product with a relief on one side by performing one stamp combined operations precipitation and exhaust flange, the subsequent forming of the material with the formation of the relief on the other side in the final stamp of transition and calibration, characterized in that the first transition receive the semi-finished product with dimensions determined from the following relations:

A1= A2-hc;

H1= H2-hc;

h1= h2-hc;

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Df1Df22Z;

ds1ds22Z;

D1D2;

hp1= hp2+

where hc- extension of the hub of the material;

A1, A2the depth of the cavity of the semi-finished product and of the product;

H1H2hub height of semi-finished products and products;

h1h2height bury in the matrix part of the hub semi-finished products and products;

t1the thickness of the fabric material;

Vf2the volume of the flange of the Df2the diameter of the flange of the semi-finished product and of the product;

D1D2the diameter of the relief of the semi-finished product and of the product;

ds1ds2hub diameter semi-finished products and products;

Z one-sided gap between the matrix and consequently the flange and the hub of the semi-finished product, is numerically equal when Polygonatum deformation (800o(C) 0.5 mm, by cold deformation 0.25 mm;

d2b2the diameter and the depth of the upper layers of the cavity;

d1the diameter of the lower cavity of the hub of the product;

the absolute increase in the depth of the relief,

and the terrain from the side adjacent to the matrix stamp, which is subjected to deformation in the stamp final passage on the same side, as on the first transition, and the calibration is carried out on the first transition.

2. The method according to p. 1, characterized in that the draught of the workpiece on the first transition is produced with double-sided centering the workpiece in the die.

 

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EFFECT: improved quality of parts.

1 dwg

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