RU1801045C - Method of making thin-wall hollow products - Google Patents

Abstract

SUMMARY OF THE INVENTION: A hollow thin-walled semi-finished product with a thick bottom is obtained from a sheet blank by multi-operation drawing. Then the bottom is stamped to produce a flange and an annular recess from the outside with a maximum diameter equal to the inner diameter of the product. The case of the semi-finished product is distributed to a diameter of at least 1.03 of its initial diameter, the bottom is punched and the body is pressed to the original size, 1 table, 6 sludge.

Description

The invention relates to the processing of metals by pressure, and in particular to methods for manufacturing thin-walled parts.

The aim of the invention is the expansion of technological capabilities through the manufacture of thin-walled otolki with thick. flange.

The proposed method is illustrated in Figs. 1-6.

At the first stage of the method implementation (Fig. 1), the initial blank 1 in the form of a disk is placed in the exhaust die 2 and the punch 3 is rolled into a cap 4. The thickness of the initial blank 1 is selected based on the drawing requirements for the thickness of the sleeve flange. Then, in the subsequent (or several subsequent) drawing operations (Fig. 2), a cup 7 with the required wall thickness is formed using the drawing punch 5 and matrix b. The next step (Fig.Z), the semi-finished product 7 on the rack 8 is placed in the stamping matrix 9. A stamp 10 form a predetermined thickness of the flange 11. With

using a wedge ring 12 with a diameter corresponding to the inner diameter of the sleeve, an annular recess is formed at the end of the semi-finished product. The stamped semifinished product (Fig. 4) is placed in a matrix 13, supported on a rigid base 14, and the punch 15 distributes the housing with an inner diameter do up to a diameter di of at least 1.03do. The value of 1.03 is determined experimentally. To determine it, a set of dispensing punches of various diameters was used to dispense semi-finished products with an inner diameter of 11.0 mm. Using each dispensing punch, 100 pieces of semifinished products were made, then, after careful adjustment of the equipment, the bottom was punched with a punch with a diameter of 11С23, and the number of parts with a ragged and crushed bump was recorded. The results are shown in the table.

The table shows that the smallest diameter of the d-dispensing punch 15 should

With

with

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2

01

with

be at least 1.03 of the original diameter do. The upper limit of the diameter eh of the punch 15 is limited by the appearance of cracks in the housing from the distribution and depends on the grade and initial state of the material, therefore, the upper limit is not set.

After dispensing, it is possible for the punch 16 to enter the semi-finished product 17 without breaking its wall (Fig. 5). The bottom is punched in the matrix 18, while the semi-finished product body continues to remain in the matrix 13. After the piercing of the bottom 19, the annular recess from the wedge ring 12 allows having an even bevel 20 at the edge instead of the burr, which excludes the further operation of removing the burr by cutting or creasing . In the next step, the semifinished product 17, located in the matrix 13 (Fig. B), is supported in the rigid base 21 and the sleeve body is crimped to the original dimensions by the crimping matrix 22.

The finished part 23 is removed from the matrix 13 using an ejector (not shown).

FORMULA AND SECTION

A method of manufacturing thin-walled hollow products from a sheet blank by multi-jigging, stamping the bottom to form a flange and an annular recess on its outer side, stamping

prefabricated housing and the formation of the bottom of the hole, characterized in that, in order to expand technological capabilities by manufacturing thin-walled bushings with a thick flange, in the process

stamping the bottom produces an annular recess with a maximum diameter equal to the inner diameter of the sleeve, the hole is formed by punching the bottom, stamping of the body is carried out by distributing to a diameter of at least 1.03 of the diameter of the semi-finished product, and after punching the bottom, the body is crimped to its original size.

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