SU1738429A1 - Method of making hollow flanged parts - Google Patents

Abstract

Usage: metal forming in the manufacture of body parts with a flange mainly by extrusion or rotary extrusion. SUMMARY OF THE INVENTION: A hollow semi-finished product 1 with a flange 2 and an allowance 6 for trimming is installed in a matrix 3. A molding section 4 is made at its end with a depth of 0.3 ... 0.5 mm less than the thickness of the flange. The tool 5 deforms the flange 2 by filling section 4. At the same time, the stock 6 is also flattened down to a thickness of 0.3 ... 0.5 mm, after which it is cut. 1 tab., 6 Il.

Description

The invention relates to the processing of metals by pressure.

The goal is to improve the quality of the parts by making it possible to obtain a high-quality surface of the cylindrical forming flange and to increase the accuracy of its geometric dimensions.

FIG. Figure 1 shows the scheme for implementing the proposed method, where to the left of the axis in the initial position the billet and deforming tool, the flanges of the billet are on the end of the die above the forming section, to the right of the axis is the last stage of the process when the flange is deformed into the forming section of the die cutting thickness of 0.3-0.5 mm; in fig. 2 — pressure cooker flange obtained; in fig. 3-node I in FIG. 2; in fig. 4 shows section A-A in FIG. 2; in fig. 5 is a section BB in FIG. 2

The proposed method is implemented as follows.

A hollow billet 1 with a flange 2 is installed in the seat of the matrix 3, while the flange with an allowance for trimming is placed above the forming section 4 of the matrix, the depth of which is 0.3 ... 0.5 mm less than the thickness of the flange and the geometrical dimensions and configuration of which corresponds the parameters of the finished flange.

Under the influence of the deforming tool 5, the flange 2 is deposited in the shaping section 4, while simultaneously reducing the flange mating radius with the matrix wall, forming a chamfer, leaking excess metal, forming an allowance of a thickness of 0.3 ... 0.5 mm, flattening it. Then the allowance is cut.

Thus, the quality of the surface of the cylindrical generatrix of the flange and the accuracy of its geometrical dimensions are ensured when performing basic technological operations. Mechanical obso

with

VI with

00

-N yu yu

A slight flange thickness of 0.3 ... 0.5 mm was applied, corresponding to the thickness of the stock.

The method is illustrated by the example of manufacturing a pressure cooker whose body flange has a complex geometric shape and is connected to the pressure cooker lid using a bayonet lock.

Specified characteristics of the pressure cooker: the roughness of the flange and the surface of the separation forming it Ra 0.80. The geometrical dimensions of the structural elements - the radii of curvature should be: RI 3 mm; Ra 3 mm; Ra 2 mm; R4 0.5 mm. Tolerance ± 0.1 mm.

Before the manufacturing process, the stock allowance was calculated to obtain a stock with a thickness of 0.3 ... 0.5 mm using the design table.

Example. Getting a pressure cooker with a diameter Of 220 m with a diameter of a piece Dressed 210 mm. Thickness of a detail is 4 mm.

220 210

10.4; according to the table Dmin 10.4 g

Amine allowance cross-sectional area 10.04 x хО, 5 5.2 mm2. Amount of allowance before

with n

draft flange D 1,3mm.do

The diameter of the workpiece D, taking into account the minimum allowance for trimming 4 mm thick (providing a 0.3 mm allowance)

220 + 1, 222.6 mm.35

The billet diameter of 222.6 mm was accepted.

0

five

0

year

about

five

Then, the workpiece was deformed in the die, and then the stock was cut.

The resulting pressure cooker had a flange with the following characteristics: its roughness and separation surfaces forming the flange RO of 0.80. The geometric dimensions of the flange radii were: Ri 3 mm ± 0.1 mm; Ra 3MM ± 0.1 mm; Ra 2 mm ± 0.1 mm; R4 0.5MM ± 0.1 mm.

The specified and exact geometrical dimensions obtained by the proposed method with high quality flange surfaces ensure the sealing of the connection between the lid and the pressure cooker housing.

Claims (1)

Invention Formula A method of manufacturing hollow parts with a flange, including obtaining a hollow semi-finished product with an allowance for trimming, placing it in a matrix having a shaping section at its end, deforming the flange, as well as trimming allowance, in order to improve the quality of parts beyond by providing the possibility of obtaining a high-quality surface of the cylindrical forming flange and increasing the accuracy of its geometrical dimensions, the flange is deformed into the forming section of the matrix, the depth of which is 0.3 ... 0.5 mm less than the flange thickness, by filling it and at the same time flattening the trimming allowance also to a thickness of 0.3 ... 0.5 mm, and trimming it is done after deforming the flange. Fi & 2 FIG. four m AS FIG. five FIG. 6