T-shaped elongated arc-shaped aluminum alloy forging cold deformation drawing die

Abstract

The present application relates to the field of aluminum alloy forge piece manufacturing, in particular to a T-shaped slender arc-shaped aluminum alloy forge piece cold deformation drawing die. The die comprises an upper die and a lower die, the upper die is provided with slide rods at both ends, the axial direction of the slide rods is inclined to the pressing direction by an angle of 10-20 degrees; the lower die is provided with an outer convex arc surface for cooperating with the lower surface of the forge piece, the arc surface is provided with an avoiding groove for placing the reinforcing rib along the circumferential direction, the upper surface of the lower die is provided with guide grooves at both ends, the two side walls of the guide grooves are provided with first guide pieces, the extension direction of the first guide pieces is consistent with the extension direction of the arc surface, the guide grooves are provided with slide blocks, the slide blocks are provided with second guide pieces for cooperating with the first guide pieces, the slide blocks are provided with sliding holes for cooperating with the slide rods, and the opposite surfaces of the two slide blocks are both provided with L-shaped buckles. The present application makes the forge piece produce uniform plastic deformation along the length direction through drawing, realizes uniform deformation of the forge piece along the length direction, and significantly improves the residual stress reduction effect.

Description

Technical Field

[0001] The invention relates to the field of aluminum alloy forging manufacturing, in particular to a cold deformation stretching die for a T-shaped slender arc-shaped aluminum alloy forging. Background Art

[0002] 7-series aluminum alloys are widely used in aircraft structural components due to their high strength and excellent corrosion resistance. Quenching is an essential process in the production of 7050 die forgings. This quenched 7050 aluminum alloy die forgings generates residual stresses. During subsequent part processing, the release and redistribution of these residual stresses can lead to part deformation. Therefore, cold deformation is commonly used to reduce residual stresses in 7050 aluminum alloy die forgings for aviation.

[0003] for Figure 1 The T-shaped, elongated, curved aluminum alloy die forging shown in the figure consists of a circular plate with a longitudinally oriented rib at the center of its lower surface. Due to its poor structural rigidity, residual stresses are more sensitive to the effects of part processing. Limited by the forging shape and pressing tonnage, the forging's cold deformation is poorly uniform, leading to uneven residual stress reduction. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a T-shaped slender arc-shaped aluminum alloy forging cold deformation stretching die for eliminating the residual stress of the forging.

[0005] The technical solution adopted by the present invention to solve the technical problem is a T-shaped slender arc-shaped aluminum alloy forging cold deformation stretching die, comprising an upper die and a lower die, wherein sliding rods are provided at both ends of the upper die, and the axial direction of the sliding rod forms an inclination angle of 10° to 20° with the pressing direction;

[0006] The lower die is provided with an outward convex arc surface for use with the lower surface of the forging, and the arc surface is provided with an avoidance groove for placing reinforcing ribs along its circumference. Guide grooves are provided at both ends of the upper surface of the lower die, and first guide members are provided on the two side walls of the guide groove. The extension direction of the first guide member is consistent with the extension direction of the arc surface. A slider is provided in the guide groove, and a second guide member for use with the first guide member is provided on the slider. A sliding hole for use with the slide rod is provided on the slider, and L-shaped buckles are provided on the opposite surfaces of the two sliders.

[0007] Furthermore, grooves are provided on both sides of the top end of the arc surface and are arranged radially along the arc surface, and the depth of the grooves is 20-50 mm.

[0008] Furthermore, the first guide member is a dovetail block, and the second guide member is a dovetail groove.

[0009] Furthermore, an avoidance hole is provided at the bottom of the guide groove, and the slide rod can move up and down in the avoidance hole.

[0010] Furthermore, the inner side of the buckle is provided with anti-slip teeth, the tooth pitch of the anti-slip teeth is 2 to 5 mm, and the tooth depth is 0.5 to 1 mm.

[0011] Furthermore, the cross section of the sliding rod is square or circular, and the ratio of the cross section size to the cross section thickness of the forging is 1:1.2 to 1.5.

[0012] Furthermore, the contact point between the sliding rod and the upper mold is rounded, and the radius of the rounded corner is R20 to R50 mm.

[0013] The beneficial effects of the present invention are as follows: by providing slide bars at both ends of the upper die, with a design of an inclination angle of 10° to 20°, during the vertical pressing process of the press, the inclination angle of the slide bars decomposes the vertical pressing force into a horizontal tensile force component, forcing the two sliders on both sides to slide synchronously outward along the guide grooves of the lower die. The L-shaped clips of the sliders tightly engage with the ends of the forging, ensuring that the tensile force is evenly transmitted along the entire length of the forging. The present invention causes uniform plastic deformation of the forging along the length direction through axial stretching, achieving uniform deformation along the length of the forging and significantly improving the residual stress reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the forging;

[0015] Figure 2 It is a structural schematic diagram of the present invention;

[0016] Figure 3 It is a schematic diagram of the connection between the slide bar and the slider;

[0017] Figure 4 It is a schematic diagram of the present invention when used.

[0018] Figure numerals: 1-upper die; 2-lower die; 3-slide rod; 4-arc surface; 5-avoidance groove; 6-guide groove; 7-first guide member; 8-slider; 9-sliding hole; 10-clip; 11-groove; 12-avoidance hole; 13-forging; 14-boss. DETAILED DESCRIPTION

[0019] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0020] like Figure 2-Figure 4As shown, the present invention provides a T-shaped slender arc-shaped aluminum alloy forging cold deformation stretching die, including an upper die 1 and a lower die 2, wherein slide rods 3 are provided at both ends of the upper die 1, and the axial direction of the slide rod 3 forms an inclination angle of 10° to 20° with the pressing direction; wherein, the slide rod 3 and the upper die 1 are both made of steel, and the slide rod 3 can be integrally formed with the upper die 1 or welded, and the slide rod 3 is located on the lower surface of the upper die 1, and the distance from the lower end of the slide rod 3 to the center line of the upper die 1 is smaller than the distance from the upper end of the slide rod 3 to the center line of the upper die 1, ensuring that the axial direction of the slide rod 3 forms an inclination angle of 10° to 20° with the pressing direction.

[0021] The lower die 2 is provided with an outward convex arc surface 4 for use with the lower surface of the forging 13, and the arc surface 4 is provided with an avoidance groove 5 for placing reinforcing ribs along its circumference. Guide grooves 6 are provided at both ends of the upper surface of the lower die 2, and first guide members 7 are provided on the two side walls of the guide groove 6. The extension direction of the first guide member 7 is consistent with the extension direction of the arc surface 4. A slider 8 is provided in the guide groove 6, and a second guide member for use with the first guide member 7 is provided on the slider 8. A sliding hole 9 for use with the slide rod 3 is provided on the slider 8, and L-shaped buckles 10 are provided on the opposite surfaces of the two sliders 8. During use, the lower surface of the forging 13 is fitted with the arc surface 4, and the reinforcing ribs are placed in the avoidance groove 5; the cross section of the guide groove 6 is rectangular, and the bottom surface of the guide groove 6 has the same curvature as the arc surface 4. The two side walls of the guide groove 6 are provided with first guide members 7, which can be T-shaped blocks connected to the side walls of the guide groove 6 by welding. The extension direction of the first guide member 7 is consistent with the extension direction of the arc surface 4, so that the moving direction of the slider 8 is consistent with the stretching direction of the forging 13, ensuring the quality of the subsequent forming of the forging 13; the cross section of the slider 8 is rectangular, and the second guide member is a T-shaped slot that cooperates with the first guide 7. The slider 8 is set in this way so that it can move along the arrangement direction of the first guide member 7. The slider 8 is provided with a sliding hole 9 used in conjunction with the slide rod 3. The axis of the sliding hole 9 is parallel to the axis of the slide rod 3. The inclination angle of the slide rod 3 decomposes the vertical pressing force into a tensile component along the direction of the first guide member 7, thereby forcing the forging 13 to extend; L-shaped clips 10 are provided on the opposite surfaces of the two sliders 8. During actual use, a rectangular boss 14 is provided on the upper surface of the forging 13, and the boss 14 is placed inside the clip 10 so that the clip 10 clamps the boss 14, so that the forging 13 can be driven to stretch when the slider 8 moves.

[0022] In order to reduce the friction between the arc surface 4 and the lower surface of the forging 13, grooves 11 are further provided on both sides of the top end of the arc surface 4 and arranged radially along the arc surface 4. The depth of the grooves 11 is 20-50 mm. In this way, only the two ends and the middle area contact the lower surface of the forging 13, reducing the contact area to reduce friction resistance, so that the forging 13 can be better stretched.

[0023] As a preferred embodiment, further, see Figure 3 The first guide member 7 is a dovetail block, and the second guide member is a dovetail groove.

[0024] In order to achieve a longer stretching distance, see Figure 3 The bottom of the guide groove 6 is provided with an escape hole 12, in which the slide bar 3 can move up and down. The cross-section of the escape hole 12 is rectangular or circular, and the length of the slide bar 3 is greater than the length of the sliding hole 9. In this way, when the top end of the slide bar 3 slides out of the sliding hole 9, the slide bar 3 can continue to move downward, thereby driving the slider 8 to move and increasing the stretching length of the forging 13.

[0025] In order to prevent the forging 13 from moving relative to the buckle 10 during the stretching process, the buckle 10 is further provided with anti-slip teeth on the inner side. The pitch of the anti-slip teeth is 2 to 5 mm and the tooth depth is 0.5 to 1 mm.

[0026] To ensure the strength of the slide bar 3, the slide bar 3 has a square or circular cross-section, and the ratio of the cross-section size to the cross-section thickness of the forging 13 is 1:1.2-1.5. For example, if the forging 13 is 50 mm thick and the square or circular cross-section size (side length or diameter) of the slide bar 3 is 60-75 mm, the ratio of 1:1.2-1.5 ensures that the slide bar 3 has sufficient impact resistance and prevents premature fracture of the slide bar 3.

[0027] In order to reduce stress concentration at the connection between the slide rod 3 and the upper die 1 , further, the contact between the slide rod 3 and the upper die 1 is rounded, and the fillet radius is R20 to R50 mm.

[0028] The specific operating process of the present invention is as follows: a quenched 7050 aluminum alloy forging 13 is placed on the arc surface 4 of the lower die 2. Lubricating oil is applied to the arc surface 4 and the guide groove 6. The clip 10 clamps the boss 14 on the forging 13. The slide rod 3 is then inserted into the sliding hole 9 of the slider 8. The press is started, and the upper die 1 is pressed down at a constant speed. The slide rod 3 pushes the slider 8 to slide outward along the extension direction of the first guide member 7, stretching the forging 13 until the forging 13 reaches the target deformation. The press is stopped, and the upper die 1 is held for 10 to 30 seconds before being unloaded and the forging 13 is removed.

[0029] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A T-shaped elongated arc aluminum alloy forging cold deformation stretching die, comprising an upper die (1) and a lower die (2), characterized in that: Slide rods (3) are provided at both ends of the upper die (1), and the axial direction of the slide rod (3) forms an inclination angle of 10° to 20° with the pressing direction; The lower die (2) is provided with an outward convex arc surface (4) for use with the lower surface of the forging, and the arc surface (4) is provided with an avoidance groove (5) for placing reinforcing ribs along its circumference. The two ends of the upper surface of the lower die (2) are provided with guide grooves (6), and the two side walls of the guide groove (6) are provided with a first guide member (7), and the extension direction of the first guide member (7) is consistent with the extension direction of the arc surface (4). A slider (8) is provided in the guide groove (6), and a second guide member for use with the first guide member (7) is provided on the slider (8). A sliding hole (9) for use with the slide rod (3) is provided on the slider (8), and L-shaped buckles (10) are provided on the opposite surfaces of the two sliders (8).

2. A T-shaped elongated arc aluminum alloy forging cold deformation stretching die according to claim 1, characterized in that: Grooves (11) arranged radially along the arc surface (4) are provided on both sides of the top end of the arc surface (4), and the depth of the grooves (11) is 20-50 mm.

3. The cold deformation drawing die for a T-shaped elongated arc-shaped aluminum alloy forging according to claim 1, characterized in that: The first guide member (7) is a dovetail block, and the second guide member is a dovetail groove.

4. A T-shaped elongated arc aluminum alloy forging cold deformation stretching die according to claim 3, characterized in that: The bottom of the guide groove (6) is provided with an avoidance hole (12), and the slide rod (3) can move up and down in the avoidance hole (12).

5. The cold deformation drawing die for a T-shaped elongated arc-shaped aluminum alloy forging according to claim 1, characterized in that: The inner side of the buckle (10) is provided with anti-skid tooth patterns, the tooth pitch of the anti-skid tooth patterns is 2-5 mm, and the tooth depth is 0.5-1 mm.

6. The cold deformation drawing die for a T-shaped elongated arc-shaped aluminum alloy forging according to claim 1, characterized in that: The cross section of the slide rod (3) is square or circular, and the ratio of the cross section size to the cross section thickness of the forging is 1:1.2-1.

5.

7. A T-shaped elongated arc aluminum alloy forging cold deformation drawing die according to claim 6, characterized in that: The contact point between the slide rod (3) and the upper die (1) is rounded, and the radius of the rounded corner is R20 to R50 mm.

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