Method for reducing residual stress of high-slenderness-ratio arc-shaped fillet opened aluminum alloy forge pieces

A technology with large slenderness ratio and residual stress, which is applied in the field of material science and engineering, can solve the problems of reducing the residual stress of alloys, achieve the effects of reducing residual stress, ensuring consistency, and reducing investment

Active Publication Date: 2016-05-04

中国第二重型机械集团德阳万航模锻有限责任公司

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AI-Extracted Technical Summary

Problems solved by technology

At present, the largest press capacity in the world is 800MN, so the residual stress of the alloy cannot be reduced by the overall cold com...

Method used

Because in step C, only the rib 11 of forging 1, the concave fillet 14 positions have been cold-compressed, so the stress of the rib 11 of forging 1, the concave fillet 14 positions is released outwards, thereby reducing The residual stress at the ribs 11 and the concave fillets 14, but there are still residual stresses outside the ribs 11 and the concave fillets 14 of the forging; Place the steel plate 2 so that it overlaps with the indentation of the compressed part by 30% to 50%, and then perform cold compression. Thereby, the stress can be released in some positions outside the cold-compressed part, and at the same time, the indentation overlaps with the compressed part by 30% to 50%, so as to avoid new stress in the cold-compressed part.

In step A, forging 1 carries out cold compression in 4 hours after solution heat treatment; Natural aging occurs after the aluminum alloy solution aging, and the strength of alloy after solid solution increases with the prolongation of placement time, in order to minimize The tonnage of equipment required for small cold compression should be cold compressed as soon as possible after solid solution, but considering factors such as production organization, forgings must be cold compressed within 4 hours after solution heat treatment. The cold compression is performed within 4 hours after the solution heat treatment of the forging 1, so as to ensure that the cold compression greatly reduces the equipment tonnage required for the cold pressing of the forging 1.

In summary, the method provided by the present invention to reduce the residual stress of aluminum alloy large slenderness ratio arc-shaped rib opening class forgings, by designing the innovative cold die structure of forgings 1, and adopting the method of carrying...

Abstract

The invention discloses a method capable of avoiding buckling of forge pieces in the length direction and reducing residual stress of high-slenderness-ratio arc-shaped fillet opened aluminum alloy forge pieces. A cold compressing die is adopted for implementing the method and the method comprises the steps that A, the forge pieces are subjected to cold compression within four hours after solid solution heat treatment; B, the forge pieces are put into the cold compressing die; C, a steel plate is longitudinally arranged in the position, corresponding to a fillet, of the non-fillet face, and then cold compression deformation is conducted; D, a new steel plate is placed on each of the two sides of the part subjected to cold compression, the overlap amount of the steel plate and the indentation of former cold compression is 30%-50%, and then cold compression deformation is conducted again; E, the step D is repeated until cold compression deformation of all zones of the non-fillet face is completed; F, finally, the middle of the non-fillet face is subjected to cold compression again; and G, overall cold compression is conducted again after segmented cold compression is completed and the overall cold compression is controlled by tonnage. By adopting the method, the uniformity of the appearance of the forge pieces can be ensured and the evenness of the cold compression deformation amount of the forge pieces is improved.

Application Domain

Handling devices

Technology Topic

Steel platesSheet steel +6

Image

Examples

Experimental program(1)

Example Embodiment

[0050] Example 1

[0051] The material of the forging in this embodiment is 7050 aluminum alloy, the outline is 6100×700×120mm, the web thickness is 80mm, the rib thickness is 40mm, the rib width is 65mm, the rib concave fillet radius is 22mm, and the forging radian 27489mm, the net projected area of the forging is 4.27m 2. The radius of the convex fillet 31 of the cold pressing die is 20mm.

[0052] In this embodiment, the cold-pressed steel plate is a 45# steel plate, and the specification of the steel plate is 6300×130×10mm. The purpose of the steel plate width of 120mm is to be able to cover the ribs and the concave round corners on both sides of the ribs during the first and last crimping.

[0053] The method for reducing the residual stress of the arc-shaped rib opening type forgings of aluminum alloy with large slenderness ratio of the present invention specifically includes the following steps:

[0054] Step 1: Such as image 3 As shown, firstly, the 45# steel plate 2 is placed directly above the ribs 11 for cold pressing, and the cold compression plastic deformation of the product is controlled to 1.5% ± 0.5%, and the steel plate is removed after cold pressing.

[0055] Step 2: Such as Figure 4 As shown, two new 45# steel plates 2 are placed on both sides of the rib 11, and the overlap of each side with the front indentation is 48mm, and then cold pressing is performed to control the cold compression plastic deformation of the product to 2.5% ±0.5%, remove the steel plate 2 after cold pressing.

[0056] Step 3: Such as Figure 5 to 7 As shown, step 2 is repeated until all areas of the non-reinforced surface 12 on the forging 1 are cold pressed.

[0057] Step 4: Finally, a steel plate 2 is cold pressed directly above the rib 11 of the forging 1 to control the cold compression plastic deformation of the product to 1.0% ± 0.5%, and the steel plate 2 is removed after cold pressing.

[0058] Step 5: After the staged cold pressing is finished, perform an overall cold pressing to control the tonnage to 60,000 tons.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Reduce residual stress
increase production capacity

Method for reducing residual stress of high-slenderness-ratio arc-shaped fillet opened aluminum alloy forge pieces

A technology with large slenderness ratio and residual stress, which is applied in the field of material science and engineering, can solve the problems of reducing the residual stress of alloys, achieve the effects of reducing residual stress, ensuring consistency, and reducing investment

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

PUM

Description & Claims & Application Information

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