1) Fix the material to be bent on a large radius bending mold for a large radius bending, with the bending height higher than the required bending height of the product; (2) Transfer the material after the large radius bending to a small radius forming mold and clamp the two sides of the bending section; (3) Extrude the material downwards to bend it, allowing the material to flow to the curved section, and the formed bending height matches the actual required height of the product, achieving small radius forming; (4) Unload the finished product. This invention solves the problem of bending cracks that often occur when bending high-hardness materials with small radii in the existing technology. The products after bending can fully meet the customer's requirements for crack-free small radius bending. The forming process ensures the bending dimensions without the need for additional shaping steps, completing the process in just two steps.
1. A small radius high-strength thick plate bending process, characterized by the following steps:
(1) Fix the material to be bent on a large radius bending mold for a large radius bending, with the bending height higher than the required bending height of the product;
(2) Transfer the material after the large radius bending to a small radius forming mold and clamp the two sides of the bending section;
(3) Extrude the material downwards to bend it, allowing the material to flow to the curved section, and the formed bending height matches the actual required height of the product, achieving small radius forming;
(4) Unload the finished product.
2. The small radius high-strength thick plate bending process according to claim 1, characterized in that the radius R of the inner corner of the bent portion of the material after the large radius bending in step (1) is 0.8-1.2 times the material thickness.
3. The small radius high-strength thick plate bending process according to claim 1, characterized in that the bending height in step (1) is 1mm-3mm higher than the required bending height of the product.
4. The small radius high-strength thick plate bending process according to any one of claims 1-3, characterized in that the radius R of the inner corner of the bent portion of the material after forming in step (3) is 0.4mm-0.6mm.
Technical Field
The present invention relates to a small radius high-strength thick plate bending process and belongs to the field of bending technology.
Background Art
In the field of product manufacturing, bending is a common process for materials. Existing bending processes can easily achieve bending with an inner corner radius R greater than 2mm. However, with technological advancements, customers are increasingly demanding smaller inner corner radii, typically around 0.5mm.
Existing methods for achieving small radius bending usually involve chamfering the edges of the bending section to relieve stress before bending it by 90 degrees. This approach can alter the shape of the product and is prone to bending cracks when the radius R is 0.5mm. Additionally, this method often requires an additional step for forming after bending to ensure the bending dimensions.
Another method for small radius bending involves chamfering the edges of the bending section to relieve stress, followed by a 45-degree bend and then a 90-degree bend. However, this process requires three steps to complete and has a high probability of cracking.
Summary of the Invention
The technical problem addressed by the present invention is to provide a small radius high-strength thick plate bending process that achieves the desired product requirements by first performing a 90-degree bend with a large radius and then using small radius forming. The process is simple and does not result in cracking at the bending section.
To solve the above technical problem, the technical solution adopted by the present invention is as follows:
A small radius high-strength thick plate bending process, comprising the following steps:
(1) Fixing the material to be bent on a large radius bending mold for a large radius bending, with the bending height higher than the required bending height of the product;
(2) Transferring the material after the large radius bending to a small radius forming mold and clamping the two sides of the bending section;
(3) Extruding the material downwards to bend it, allowing the material to flow to the curved section, and the formed bending height matches the actual required height of the product, achieving small radius forming;
(4) Unloading the finished product.
The aforementioned small radius high-strength thick plate bending process is characterized by the radius of the inner corner of the material after the large radius bending in step (1) being 0.8-1.2 times the material thickness.
The aforementioned small radius high-strength thick plate bending process is characterized by the bending height in step (1) being 1mm-3mm higher than the required bending height of the product.
The aforementioned small radius high-strength thick plate bending process is characterized by the radius R of the inner corner of the bent portion of the material after forming in step (3) being 0.4mm-0.6mm.
The advantageous effect is that by first performing a 90-degree bend with a large radius and then extruding the material downwards at the bending section to achieve small radius forming, the process is simple and does not result in cracking at the bending section, ensuring the quality of the product.
Specific embodiments
The upper die base 1 is connected to the punch fixing plate 2. The upper bending block 3 is fixed in the punch fixing plate 2, and the lower bending block 4 is fixed on the lower die base 8 and passes through the discharge plate 7. Before bending the material, the surface of the discharge plate 7 is slightly higher than the upper surface of the lower bending block 4. The punch fixing plate 2 is located above the discharge plate 7. The material 6 to be bent is horizontally fixed on the discharge plate 7. The upper die base 1 presses down, and the upper bending block 3 and the lower bending block 4 are used to perform a large radius bending on the material 6. The bending height of the bent material 5 is higher than the required bending height of the product by more than 1mm. The radius of the inner corner of the bent portion of the material after the large radius bending is 0.8-1.2 times the material thickness, preferably 1 times the material thickness.
The punch fixing plate 2 is equipped with a forming bending block 9 and a bending height adjustment block 10. The forming bending block 9 is located below the bending height adjustment block 10. After the large radius bending, the material 5 is fixed on the discharge plate 7. When the upper die base 1 presses down, the forming bending block 9 and the forming stop block 11 clamp the bending portion of the material 5, and the bending height adjustment block 10 presses down on the bending portion of the material 5, causing the material in the bending section to move downward and achieve small radius forming. The radius of the inner corner of the bent portion of the formed material is R=0.4mm-0.6mm. Finally, unloading is completed.
In summary, the provided small radius high-strength thick plate bending process ensures that the products after bending fully meet the customer's requirements for crack-free small radius bending. The forming process guarantees the bending dimensions without the need for additional shaping steps, completing the process in just two steps.
The above description and illustrations have shown the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the process is not limited to the above embodiments. The embodiments and descriptions provided in the specification are merely illustrative of the principles of the present invention. Various modifications and improvements can be made within the scope of the present invention without departing from the spirit and scope of the invention, which is defined by the appended claims.
