SU1214276A2 - Method of producing flanged parts from tubular work - Google Patents

Description

The invention relates to the processing of metals by pressure and can be used in the stamping of tubular parts with a flange of highly plastic materials.

The purpose of the invention is the expansion of technological capabilities by manufacturing parts from highly plastic materials.

In the manufacture of parts with a flange from a tubular billet, prior to flattening, the blank is pushed out of the punch and matrix by a value of 0.2–0.3 the length of a section of the pipe subjected to double-sided end draft with a convexity formed in the central zone of the blank, and then flattened down by a diameter equal to flange diameter details.

The method is carried out in the following sequence.

In the first stage, depending on the relative thickness of the material S / d and modulus of elasticity E, the critical length of the section is determined from the condition of obtaining only one thickness. Sludge is formed and the corrugation is formed on the tubular billet to 30-40% of the original diameter. Then the tubular billet extends from both halves of the punch to a (0,2-0,3) critical length. As a result, the next stage (further forming of the corrugation with simultaneous settling of the material before flattening the internal surfaces of the pipe billet) occurs with an additional set of material in volume, reaching up to (0.4-0.6} of the initial crimping section of the tubular billet in the first section, this allows more complete use of the high ductility of materials and the achievement of a greater, yes, meter of the flange of the part.

The drawing shows the completion of the initial stage - distribution of the workpiece in the zone of flange formation (left) and the beginning of the completion of sewing the workpiece in the zone of flange formation (right).

The floor of the tubular billet 1 is installed on the pin 2 and the die 3. When the upper part of the die is moved, a preliminary

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Order 824/15

Branch PPP Patent, Uzhgorod, st. Project, 4

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deformation at an angle equal to the angle of the beveled surfaces of the 3n matrix of the punch 4 with the formation of one convexity of the section of the workpiece with a critical length. The workpiece is removed from the stamp with the help of pushers 5. After the preliminary batch of parts is made, a new stamp setting is made (replacing the stop 6 on the punch by the stop 8, and the stop 7 on the die on the stop 9, ensuring the workpiece is pushed out of the punch and die (0.2 -0.3 critical length) and carry out the final stage with the supply of additional material to the deformation zone.

After removing the molded preform, the radius of the peripheral zone is turned to the drawing dimensions of the flange.

Example. The method was tested on a tubular billet 12 x 1 of st. 20 at an angle of inclination of the flange to the axis of the part equal to 90, without creating a superplasticity mode and without heating. The radius on the edge of the punch and the matrix of 1-1.5 mm

By test forgings, the critical length for this size was set to 3 mm. At the same time, the outer diameter of the flange after closing the inner surfaces of the corrugated protuberance is 17.5 mm, the total length of the original cylindrical billet is 50 mm. Then, by replacing the stops, the maximum pipe penetration from the punch and die was determined, at which a crack at the top of the workpiece bore did not form and the critical section 13 mm long was pre-distributed by 15 mm. Experimentally it was found that the maximum extension was 3.5 mm on each side i.e. A tube material with a length of 20 mm was fed to the deformation zone. With this, an outer diameter of the flange of 20 mm was obtained, i.e. the increase in diameter (l) was 20%,

The application of the proposed method for highly plastic materials will allow a 20% increase in the outer diameter of the flange, obtained by a known method.

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Claims (1)

METHOD FOR PRODUCING PARTS WITH FLANGE FROM TUBULAR BITTING by ed. No. 1050776, characterized in that, in order to expand technological capabilities by manufacturing parts from highly plastic materials, between the first draft of the workpiece and flattening of the bulge carry out additional draft of the workpiece by an amount equal to 0.2-0.3 height of the deposited area.