A stamp for forming blades

 

(57) Abstract:

The inventive stamp for forming the blades from sheet material, mainly for the auger, includes upper and lower parts of the engravings, the plane of the connector which holds the screw surfaces of rotation, limited external and internal helical lines with different angles of ascent, and the gap between the surfaces. Clearance made diverging toward the center of the inner helices in accordance with a given dependency. The gap can be made divergent in the upper part, the lower part or both parts. 3 C.p. f-crystals, 1 Il.

The invention relates to the manufacture of machine parts of complex shape, namely, the forming blades of the augers and can be used in metallurgy and heavy engineering.

Famous dies for forming parts from sheet stock with a double curvature surfaces are biconvex and convexo-concave. Forming such stamps carried out sequentially by the longitudinal displacement of the sheet [1]

The lack of a stamp are low productivity and low accuracy of the forming process.

Perform gap diverging avoids uneven clamp (drafts) sheet stamp, heterogeneous scheme of deformation and to carry out the forming only the shear deformation. In which results in a reduction of the strain deformation and uniform study of the original structure of the workpiece.

The drawing shows a General view of the stamp closed up with molded lip.

The stamp consists of the upper 1 and lower 2 parts with engravings done on the helical surfaces of rotation 3, 4. Engraving is limited to the outer 5 and 6 internal helical lines having different angles of ascentNar.andEXT.Between the helical surfaces of rotation, the gap 7 is made in accordance with the relationship:

< / BR>
This gap can be unilateral or bilateral.

Stamp works as follows.

First, the upper part of the stamp 1 rises to a height greater thickness of the original piece.

On the bottom part 2 (in the die cavity) stack the sheet. Then perform a full or partial closure of parts of a stamp by a hammer blow or stroke of the press.

Stamp mo is it part of the stamp on the sliding table of the press.

Example.

Made the blade SHRP 146 to screw with the inner diameter of 450 mm and an outer 1240 mm While the elevation angle of the blades on the outer surface was 72oand internal 47,5o.

The thickness of the original sheet flat blanks was 50 mm Diameter 1465 mm, and the inner 670 mm

Material steel 10.

Material steel 10G2C1.

In a given thickness of the workpiece and angles of ascent of the inner and outer helical lines, the maximum value of the gap (internal helix) will be:

< / BR>
Step screw surface is 1265 mm (for auger SHRP on the inner and outer helical lines step are the same).

In the manufacture of engraving stamp adjustments were made in the step of the inner spiral lines, reduced by the value ofEXT.., which has a diameter of 450 mm is 15,25 mm, Therefore, the step helix should be reduced by this amount and will:

1265 15,25 1249,75 mm

That is, the connector when closed (without blanks) upper and lower parts of the stamp varies from 0 mm (outer helix O 1240 mm to 15, 25 mm, at 450 mm internal This change was made in the upper part of the stamp.

After heating the sheet to a temperature of stamping, the latter was placed in the lower part of the stamp and made a molding lowering the upper part of the stamp before closing the thickness of the workpiece.

Then traverse raised, molded blade was removed from the die and cooled in air.

Conducted industrial research forming process showed that this stamp is a high precision of the final product with minimal clamping.

1. A stamp for forming the blades from sheet material primarily for auger comprising upper and lower parts of the engravings, the plane of the connector which holds the screw surfaces of rotation, limited external and internal helical lines with different angles of ascent and the gap between the surfaces, wherein the gap is made divergent to the center of the inner helices in accordance with addiction

< / BR>
whereNRanddrugthe gap formed by the inner and outer helical lines;

and the thickness of the sheet stock;

NRanddrugelevation vota at the top.

3. Stamp on p. 1, characterized in that the gap is made divergent in the lower part.

4. Stamp on p. 1, characterized in that the gap is made divergent in both parts.

 

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