Method for forming, mainly shapes with w-like cross section

FIELD: plastic working of metals.

SUBSTANCE: method comprises steps of preliminarily bending strip for forming radius portions between members of blank and finally bending strip by applying normal and tangential efforts to blank members. At preliminarily bending strip its central portion is bent and simultaneously concave cylindrical shape is imparted to members of strip central portion at maximum camber consisting 0.5 - 0.6 of initial thickness of strip. Final bending is realized after applying normal efforts to peripheral portions of blank for further straightening concave portions of blank.

EFFECT: enhanced quality of W-shaped parts due to elimination of thinning them in radius portions.

8 dwg, 1 ex

 

The invention relates to the processing of metals by pressure and can be used in various industries for manufacturing of sheet profiles.

There is a method of making articles from sheet blanks, which produce the preliminary bending of the strip, forming a radial section between elements of the workpiece, and then carry out the final bending by application of normal and tangential force to the procurement elements [1].

A disadvantage of the known technical solution is what is needed to produce experimental debugging process flexible to achieve the specified accuracy.

Closest to the proposed invention to the technical essence and the achieved effect is a method for manufacturing profiles predominantly W-shaped section, which produce the preliminary bending of the strip, forming a radial plots between the elements of the workpiece, and the final bending the Central part of the billet to the desired size by the application of normal and tangentially efforts to procurement elements [2].

Known solution allows to reduce the radius of curvature of the profiles, to reduce springback of flexible material, however, the thinning that occurs in radial sections, does not provide the required quality of manufacturing.

Technical the cue result, achieved by use of the present invention is to improve the quality of manufacturing of parts W-shaped due to the exclusion of thinning of the material in radial sections details.

The achievement of the technical result from the use of the developed invention is ensured by the fact that in the method of manufacturing profiles predominantly W-shaped section, which produce a preliminary bending of the strip, forming a radial plots between the elements of the workpiece, and then her final bending by application of normal and tangential force to the procurement elements, the proposed preliminary bend to follow the curvature of the Central part of the strip while simultaneously giving the elements of the Central part of the cylindrical concave shape, the maximum deflection is in the range of 0.5 to 0.6 of the original thickness of the strip, and the final bending is carried out after application of the normal effort on the peripheral portion of the workpiece with the subsequent straightening of the Central concave the procurement elements.

The essence of the developed technical solutions illustrated by the drawing, which shows steps of manufacturing a flexible profile W-shaped section of sheet stock:

- figure 1 shows the initial position of the workpiece prior to flexible centralnotice workpiece;

- figure 2 shows the position of the workpiece after the preliminary flexible Central part of the billet;

- figure 3 shows the position of the workpiece prior to a flexible peripheral areas of the workpiece;

- figure 4 shows the position of the workpiece after the preliminary flexible peripheral areas of the workpiece;

- figure 5 shows the position of the workpiece before the beginning of the final flexible with straightening of the Central parts of the workpiece;

- figure 6 shows the position of the workpiece after the final bending straightening Central sections of the workpiece;

- 7 shows a W-shaped workpiece after the end of the flexible;

on Fig shows a W-shaped item after the final flexible.

The proposed method is carried out in the devices, which consist of the following main parts.

To the internal RAM of a press (not shown) attached to the Central punch 1 and to the outer slide of the press attached peripheral punches 2. On the table press installed bending matrix 3 attached to the side walls 4. On the side walls 4 fixed mounting frame 5, in which the flat blank 6 is oriented in the direction along and across the centerline of the stamp in the plan.

The workpiece 6 on the flexible stages according to figure 2-6 assigned items 7-11. Flexible flat sheet metal workpiece 6 in item W-clicks the EIT section is as follows.

After placing a flat sheet metal workpiece 6 in the installation frame 5 in the stamp for pre-included flexible working stroke of the inner slide press down, a move which together with the Central punch 1 leads to the preliminary bending of the Central part of the workpiece 6 in the position according to figure 2 in the process of closing the plug 1 with the Central part of the matrix 3. Due to the fact that the punch 1 has a convex shape of the working part and the Central part of the matrix 3 has a convex shape, the workpiece 7 acquires a concave shape. Then the team goes on moving down the outside of the press slide together with the peripheral punches 2, which provide the bending peripheral portion of the workpiece 9 (see figure 4). After preliminary flexible workpiece 9 is installed in the stamp for final stamping (see figure 5). The final bending of the Central concave workpiece 10 (see figure 5) is carried out after the preliminary pressing the peripheral areas of the workpiece 10 peripheral punches 2, the movement of the Central punch 1 to closure with the workpiece 11 and the matrix 3. Due to the fact that the working surface of the punch 1 and the Central part of the matrix 3 stamp for final stamping are flat, the Central wall of the workpiece 11 and three radial plot compressed and, when the straightening Central is on preparation section 11 is a redistribution of the material of the Central part of the billet, leading to a decrease in the outer radii radius sections to values close to zero. After the end of the bending part 11 of the Central and peripheral punches 1 and 2 is returned to its extreme upper position, the stamped part 11 is removed from the working area of the device.

Obviously, pre-punching of the Central part 9 must be such that during the final bending with compression of the walls and the product and its radius sections according to Fig.6 ensure the flatness of the Central part without buckling it.

In this case, the maximum deflection of the concave cylindrical sections of the Central zone of the workpiece 5 must be in the range of 0.5-0.6, the thickness of the workpiece 6, which ensures the reduction of the radii radius sections and prevent buckling of the Central portion of the workpiece.

An example of implementation of the proposed method is flexible. For the manufacture of profiles W-shaped section of heat-resistant steel with a tensile strength σin=80 kg/mm2and with a yield strength σS=50 kg/mm2with the following product parameters: thickness S=1.0 mm, the bend radius r=0.2 mm, and the height H=50 mm and width 50 mm four rectangular wall parts, the calculation of the workpiece is carried out according to the guides for cold forging (for example [3], p.137). The maximum deflection of the Central nervous system, the second part, when the pre-stamping, taken equal to 0.5×S=0.5×1.0=0.5 mm.

The force of the pre-bending on the Central punch P, etc.is determined from the conditions for the creation of stresses in the radial part and the walls of the garment, not exceeding the yield strength, ie,

Bending force Ppto edit the peripheral walls (according to /3/, s) during pre-bending is calculated by the formula:

After preliminary flexible part has a W-shaped with the concave cylindrical walls of the Central section of the workpiece. The maximum deflection of the walls of the Central section of 0.5 mm.

The final bending of the workpiece 10 (see figure 5) is carried out after the installation of the workpiece in the stamp for the final flexible. Produce pressing the peripheral areas of the workpiece 10 peripheral punches 2 with a force of Popthat equals force advanced flexible peripheral areas and which is 11 THC.

Moving the Central punch 1 to closure with the workpiece 11 and the sensor 3 leads to straightening of the concave cylindrical sections, the maximum deflection which is equal to 0.5 mm, the Force on the Central punch Poz.defined:

Thus for manufacturing Professor is lei W-shaped section developed techniques and set the power settings of the implementation of the technical solutions.

Sources of information

1. Copyright certificate №657888 (USSR) M CL. B 21 D 5/00 "Method of making profiles. BI No. 15, 1979.

2. Patent RU NO. 2110348 21 D 5/00, 22/02 "Method of making profiles predominantly W-shaped cross-section", bull. No. 13, 1998

3. Malov A.N. The technology of cold pressing. M: mechanical engineering, 1969, s.

A method of manufacturing profiles predominantly W-shaped section including a preliminary bending of the strip with the formation of radial sections between elements of the workpiece and its final bending by application of normal and tangential force to the procurement elements, characterized in that to increase the quality of parts pre-bending is accomplished by bending the Central part of the strip while simultaneously giving the elements of the Central part of the cylindrical concave shapes, the maximum deflection is in the range of 0.5 to 0.6 of the original thickness of the strip, and the final bending is carried out after the application of the normal effort on the peripheral portion of the workpiece with the subsequent straightening concave elements of the workpiece.



 

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