Forming die and forming method of bulkhead with asymmetrical two sides

Abstract

The invention provides a forming die and a forming method for a two-side asymmetric bulkhead, and aims to solve the problem of more material waste in the die forging forming process of the two-side asymmetric bulkhead. The upper die and the lower die are both provided with two-side asymmetric cavities matched with the two-side asymmetric bulkheads, each cavity is internally provided with a wad forming boss, each wad forming boss is provided with an arc-shaped material distribution process groove, the radius of each material distribution process groove is larger than that of a bar used for forming the two-side asymmetric bulkheads, and the arc-shaped material distribution process grooves are used for forming the two-side asymmetric bulkheads. In the direction close to the web plate, the material distribution process grooves are gradually deviated towards the side, with the large width, of the partition frame part relative to the center line X1; a first positioning part which can be matched with one side of the bar to enable the bar to be placed along the center line X1 is arranged on one side of one end of the material distributing process groove of the lower die, and a second positioning part which can be matched with the bar to enable the bar to be placed along the center line X1 is arranged on one side of the other end of the material distributing process groove of the lower die. The manufacturing cost of the part can be reduced, and the mechanical property of the part is better.

Description

Technical Field

[0001] The invention relates to the field of forging, in particular to a forming die and a forming method for a two-side asymmetric bulkhead. Background Art

[0002] Bulkhead die forgings are load-bearing structural parts widely used in aerospace vehicles and are made of high-performance lightweight alloy materials (such as aluminum alloy and titanium alloy). Figure 1 As shown, the bulkhead 1 includes two bulkhead parts 101, a web 102 connecting the two bulkhead parts 101, and ear plates 104 arranged at both ends of the bulkhead, and hollow parts 103 (through holes) are arranged in each bulkhead part 101. Bulkhead forgings include symmetrical bulkhead forgings on both sides and asymmetrical bulkhead forgings on both sides. Figure 1 As shown, the symmetrical bulkhead forgings on both sides, that is, the bulkhead is symmetrical on both sides relative to the center line X of the hollow part along the length direction. Figure 2 As shown, the width of the middle part of the asymmetric bulkhead on both sides, that is, the bulkhead part 101 and the web 102, on one side of the center line X of the hollow part is greater than that on the other side, while the widths of the ear plates at both ends are opposite. Since the width of the middle part of the asymmetric bulkhead on both sides is greater than that on the other side of the center line X of the hollow part, and the widths of the ear plates at both ends are opposite, during forging, more material is required on one side of the center line X of the hollow part than on the other side, while the widths of the ear plates at both ends are opposite.

[0003] At present, bulkhead forgings are usually formed by bar forging. For example, the Chinese patent with application number 202311764492.7 discloses a method for forging an integral bulkhead of a titanium alloy. This method is to set a skin-forming boss corresponding to the position of the hollow part in the upper and lower mold cavities of the forming mold, and then place the bar on the skin-forming boss of the lower mold, and use the upper and lower molds to forge the bar into a forging with a skin in the hollow part 103, and finally remove the excess skin and flash to obtain the bulkhead parts. This method can reduce material loss, especially reduce the material loss of forging bulkhead parts that are symmetrical on both sides. However, for asymmetric bulkhead parts on both sides, because the middle part of the forging, referred to as the middle part, requires more material on one side of the center line X of the hollow part than on the other side during forging, while the opposite is true at both ends, the bar cannot be simply offset to one side of the mold. At present, in order to facilitate the material to fill the forging forming groove (cavity) during forging, the usual practice is to design the width of the mold cavity on the narrower side of the hollow center line X to be the same as the width of the wider side, so that the mold cavity is symmetrical on both sides relative to the hollow center line X. In this way, the bar material is first forged into a symmetrical bulkhead forging, and then the excess material and the skin on the narrower side of the forging are removed to obtain an asymmetric bulkhead on both sides. This method of forging asymmetric bulkheads on both sides still has the problem of much material waste. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a forming die and a forming method for an asymmetric bulkhead frame on both sides, so as to solve the problem of large amount of material waste during the die forging forming process of the asymmetric bulkhead frame on both sides.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a forming die for an asymmetric bulkhead on both sides, the asymmetric bulkhead on both sides comprises two bulkhead parts, a web connecting the two bulkhead parts, and ear plates arranged at both ends of the bulkhead; hollow parts are arranged in the bulkhead parts, the width of the ear plates on the right side of the center line X of the hollow part along the length direction of the bulkhead is greater than the width on the left side, the width of the bulkhead part and the web on the left side of the center line X of the hollow part is greater than the width on the right side, and the die comprises an upper die and a lower die that cooperate with each other;

[0006] The upper mold and the lower mold are both provided with asymmetric cavities on both sides matching the asymmetric bulkheads on both sides, and the cavities are both provided with skin-connected forming bosses, and the skin-connected forming bosses correspond to the positions of the corresponding hollow parts. The skin-connected forming bosses are both provided with arc-shaped material dividing process grooves extending along the center line X1 in the length direction of the skin-connected forming bosses, and the radius of the material dividing process grooves is greater than the radius of the rods used to form the asymmetric bulkheads on both sides. Along the direction close to the web, the material dividing process grooves are gradually offset toward the side with a larger width of the bulkhead part relative to the center line X1; one side of one end of the material dividing process groove of the lower mold is provided with a first positioning portion that can cooperate with one side of the rod to place the rod along the center line X1, and one side of the other end is provided with a second positioning portion that can cooperate with the rod to place the rod along the center line X1.

[0007] Furthermore, the depth a of the material dividing process groove is a≥0.06d, where d is the diameter of the bar.

[0008] Furthermore, a smooth transition is arranged between the skin-jointed forming boss and the asymmetric cavities on both sides.

[0009] The present invention also provides a method for forming a biaxially asymmetric bulkhead, wherein the method adopts the above-mentioned forming die for biaxially asymmetric bulkhead.

[0010] The beneficial effects of the present invention are as follows: a forming mold and forming method for asymmetric bulkheads on both sides of the present invention, the cavities of the upper and lower molds of the mold are designed to be asymmetric structures matching the asymmetric bulkheads on both sides, and an arc-shaped dividing process groove 203 extending along the center line X1 in the length direction is provided on the skin-forming boss 202 of the cavity, the radius of the dividing process groove 203 is larger than the radius of the bar material used to form the asymmetric bulkheads on both sides, along the direction close to the web 102, the dividing process groove 203 is gradually offset toward the side with a larger width of the bulkhead portion 101 relative to the center line X1, and one side of one end of the dividing process groove 203 of the lower mold 21 is provided with a portion that can cooperate with one side of the bar material so that the bar material can be extended along the center line X1 is placed on the first positioning part 2031, and the other end is provided with a second positioning part 2032 on one side which can cooperate with the bar material to place the bar material along the center line X1. In this way, the bar material can be bent into a bow shape by utilizing the dividing process groove during the bar forging process, thereby achieving the purpose of dividing the middle and end parts of the bar material toward the side with more material. In the subsequent upper and lower pressing process, it provides a guarantee for the material to fill the asymmetric cavities on both sides, and can directly form asymmetric forgings on both sides that match the asymmetric bulkheads on both sides. Finally, it is only necessary to remove the excess skin and flash of the forgings to obtain the parts. Less material is removed during the part forming process, which can reduce the manufacturing cost of the parts, and the material continuity of the parts is better, and the mechanical properties of the parts are also better. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of a partition frame that is symmetrical on both sides;

[0012] Figure 2 It is a structural schematic diagram of the asymmetric bulkheads on both sides;

[0013] Figure 3 It is a schematic diagram of the top view of the lower mold structure of the present invention;

[0014] Figure 4 It is a schematic diagram of the upper mold structure of the present invention when viewed from above;

[0015] Figure 5 This is a schematic diagram of bar placement and positioning;

[0016] Figure 6 It is the deformation diagram during the bar forming process;

[0017] As shown in the figure: bulkhead 1, rod material 3, bulkhead portion 101, web 102, hollow portion 103, ear plate 104, lower die 21, upper die 22, cavity 201, skin forming boss 202, material dividing process groove 203, smooth transition section 204, first positioning portion 2031, and second positioning portion 2032. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] like Figures 2 to 5 As shown, a forming die of an asymmetric bulkhead on both sides of the present invention, the asymmetric bulkhead parts on both sides include two bulkhead parts 101, a web 102 connecting the two bulkhead parts 101, and ear plates 104 arranged at both ends of the bulkhead; hollow parts 103 are arranged in the bulkhead parts 101, the width of the ear plates 104 on the right side of the center line X of the hollow part along the length direction of the bulkhead is greater than the width on the left side, and the width of the bulkhead part 101 and the web 102 on the left side of the center line X of the hollow part is greater than the width on the right side. It should be noted that in the present invention, the left side and the right side represent relative positional relationships and cannot be understood as a limitation on specific directions. In order to solve the problem of more material waste during the die forging process of the above-mentioned asymmetric bulkhead frames on both sides, the mold of the present invention includes an upper mold 22 and a lower mold 21 that cooperate with each other, and the upper mold 22 and the lower mold 21 are both provided with asymmetric cavities 201 on both sides that match the asymmetric bulkhead frames on both sides, and the cavities 201 are both provided with skin-forming bosses 202, and the skin-forming bosses 202 correspond to the positions of the corresponding hollow portions 103 to form the skin in the corresponding hollow portions 103, and the skin-forming bosses 202 are both provided with arc-shaped dividing bosses extending along the center line X1 in the length direction of the skin-forming bosses 202. The material dividing process groove 203 has a radius greater than the radius of the bar material used to form the asymmetric bulkheads on both sides. Along the direction close to the web 102, the material dividing process groove 203 is gradually offset to the side (left side) with a larger width of the bulkhead portion 101 relative to the center line X1; one side of one end of the material dividing process groove 203 of the lower mold 21 is provided with a first positioning portion 2031 that can cooperate with one side of the bar material to place the bar material along the center line X1, and one side of the other end is provided with a second positioning portion 2032 that can cooperate with the bar material to place the bar material along the center line X1. The first positioning portion 2031 and the second positioning portion 2032 can be directly formed by the groove wall of the material dividing process groove 203.

[0020] In the present invention, the length direction of the cavity (the connection direction of the two end ear plates) is the length direction of the skin-forming boss 202 .

[0021] Since the skin-forming boss 202 corresponds to the corresponding hollow portion 103 in position, and is used to form the skin in the corresponding hollow portion 103, when the bulkhead is forged, the projection of the center line X of the hollow portion coincides with the projection of the center line X1 of the skin-forming boss 202 on the horizontal plane.

[0022] It is understandable that, in order to facilitate the flow of materials, there should be a smooth transition between the skin-forming boss 202 and the asymmetric cavities 201 on both sides. That is, a smooth transition section 204 is provided between the skin-forming boss 202 and the asymmetric cavities 201 on both sides to make the two transition smoothly.

[0023] The forming mold for the asymmetric bulkheads on both sides of the present invention designs the cavities of the upper and lower molds of the mold into an asymmetric structure that matches the asymmetric bulkheads on both sides, and an arc-shaped material dividing process groove 203 extending along the center line X1 in its length direction is provided on the skin forming boss 202 of the cavity, and the radius of the material dividing process groove 203 is larger than the radius of the rod used to form the asymmetric bulkheads on both sides. Along the direction close to the web 102, the material dividing process groove 203 is gradually offset toward the side with a larger width of the bulkhead portion 101 relative to the center line X1, and one side of one end of the material dividing process groove 203 of the lower mold 21 is provided with a first positioning portion 2031 that can cooperate with one side of the rod to place the rod along the center line X1, and one side of the other end is provided with a first positioning portion 2031 that can cooperate with the rod The second positioning portion 2032 is combined to place the bar along the center line X1. In this way, the bar can be placed in the dividing process groove 203 on the two skin forming bosses 202 in the cavity along the center line X1, and the first positioning portion 2031 and the second positioning portion 2032 thereon are respectively used to abut and cooperate with both ends of the bar to position it. The bar will not be displaced during the forging process, and because the dividing process groove 203 of the upper and lower molds is gradually offset toward the side with a larger width of the partition frame portion 101 relative to the center line X1 along the direction close to the web 102, part of the material of the bar will first enter the dividing process groove 203 during the downward pressing process of the upper mold, and the bar will first be gradually bent toward the side with a larger width of the partition frame portion 101 to form a bow shape under the action of the dividing process groove 203 (see Figure 6 ), so as to achieve the purpose of making the middle and end of the bar material to be divided to the side with more material (the middle of the bar material is divided to the left, and the end is divided to the right). In this way, in the subsequent upper die pressing process, it can be ensured that the material fills the asymmetric cavity 201 on both sides, and the asymmetric forgings on both sides that match the asymmetric bulkheads on both sides can be directly forged. Finally, the excess skin and flash of the asymmetric forgings on both sides can be removed to obtain the asymmetric bulkheads on both sides.

[0024] In the present invention, the specific offset of the material dividing process groove 203 to the side with larger width of the bulkhead portion 101 should be determined according to the width of both sides of the asymmetric bulkheads. Specifically, a suitable value can be obtained through field experiments or simulation using existing die forging simulation software.

[0025] The mold of the present invention can utilize the material dividing process groove to bend the bar into a bow shape during the bar forging process, thereby achieving the purpose of dividing the middle and end parts of the bar toward the side with more material. In this way, in the subsequent upper mold pressing process, it can be ensured that the material fills the asymmetric cavities on both sides, and can directly form asymmetric forgings on both sides that match the asymmetric bulkheads on both sides. The parts can be obtained by simply removing the excess skin and flash of the forgings. Less material is removed during the part forming process, and the material continuity of the parts is better, and the mechanical properties of the parts are also better.

[0026] In order to ensure the bending and dividing effect of the dividing process groove, through experiments, it is found that the depth a of the dividing process groove 203 is best when a≥0.06d, and d is the diameter of the bar.

[0027] The present invention also provides a forming method of a double-sided asymmetric bulkhead, which adopts the above-mentioned forming die of the double-sided asymmetric bulkhead. In this method, less material is removed during the part forming process (only the excess skin and flash of the forging need to be removed to obtain the part), the material continuity of the part is better, and the mechanical properties of the part are also better.

Claims

1. A forming mold for an asymmetric bulkhead on both sides, the asymmetric bulkhead on both sides comprising two bulkhead parts (101), a web (102) connecting the two bulkhead parts (101), and ear plates (104) arranged at both ends of the bulkhead; a hollow part (103) is arranged in each bulkhead part (101), the width of the ear plate (104) on the right side of a center line X of the hollow part along the length direction of the bulkhead is greater than the width on the left side, the width of the bulkhead part (101) and the web (102) on the left side of the center line X of the hollow part is greater than the width on the right side, the mold comprises an upper mold (22) and a lower mold (21) that cooperate with each other, characterized in that: The upper mold (22) and the lower mold (21) are both provided with asymmetric cavities (201) on both sides matching the asymmetric bulkheads on both sides, and the cavities (201) are both provided with skin-forming bosses (202), and the positions of the skin-forming bosses (202) and the corresponding hollow portions (103) are corresponding, and the skin-forming bosses (202) are both provided with arc-shaped material dividing process grooves (203) extending along the center line X1 in the length direction of the skin-forming bosses (202), and the radius of the material dividing process grooves (203) is greater than the radius of the material dividing process grooves used for forming. The radius of the rods of the asymmetric bulkheads on both sides is arranged along the direction close to the web (102), and the material dividing process grooves (203) are gradually offset to the side with a larger width of the bulkhead portion (101) relative to the center line X1; one side of one end of the material dividing process groove (203) of the lower mold (21) is provided with a first positioning portion (2031) that can cooperate with one side of the rod so that the rod is placed along the center line X1, and one side of the other end is provided with a second positioning portion (2032) that can cooperate with the rod so that the rod is placed along the center line X1.

2. A forming die for asymmetric bulkheads on both sides as claimed in claim 1, characterized in that: The depth a of the material dividing process groove (203) is ≥ 0.06d, where d is the diameter of the bar material.

3. The forming die of the asymmetric bulkhead frame on both sides according to claim 1, characterized in that: A smooth transition is provided between the skin-forming boss (202) and the asymmetric cavities (201) on both sides.

4. A method for forming a two-sided asymmetric bulkhead, characterized in that: The method adopts a forming mold for an asymmetric bulkhead on both sides as claimed in any one of claims 1 to 3.

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