Blank manufacturing process method for aviation ultra-high-strength steel complex die forging

Abstract

The invention discloses a blank-making process method for an aviation ultrahigh-strength steel complex die forging, which comprises the following steps: step 1, upsetting and forming a moulding bed, namely selecting an A-100 ultrahigh-strength steel bar with the diameter of 300mm * (943 + / -10mm), putting the A-100 ultrahigh-strength steel bar into a lower moulding bed of a moulding bed die, covering an upper moulding bed of the upper moulding bed die, upsetting through a fast forging machine, and forming a blank on the upper moulding bed of the moulding bed die; upsetting until the upper moulding bed and the lower moulding bed of the moulding bed are closed; secondly, the blank obtained after upsetting is subjected to free forging and pressing flattening forming, and flattening is conducted till H is 130 + / -3 mm; thirdly, the blank is cut into two identical halves through water cutting, and the deflection angle of a cutting line along the short central axis is 22 + / -2 degrees; the blank is manufactured and then can be used for die forging forming. The invention provides an innovative blank making process method, and aims to reduce the feeding weight and material cost of forgings, reduce the striking capacity required by equipment and ensure good filling of the forgings and high product consistency by designing a reasonable blank making tool and a reasonable blank making method.

Description

Technical Field

[0001] The present invention relates to the field of aviation equipment manufacturing, and specifically to a blank-making process method for a forging with complex cross-section changes of ultra-high strength steel for aviation use. Background Art

[0002] With the continuous progress of aviation equipment technology, the demand for ultra-high strength steel materials is increasing day by day. A-100 is a Co-Ni ultra-high strength steel, which has ultra-high strength, excellent fracture toughness, stress corrosion cracking resistance, and good welding performance. It is widely used in parts such as the outer cylinder of aircraft landing gears, piston rods, and transmission cylinders. Its material cost is high, and due to the particularity of the material, it has high requirements for grain size. Therefore, the heating temperature should not be too high and a large deformation amount is required, which poses many challenges in the manufacturing process. Traditional blank-making and forging methods not only consume a large amount of materials and require high equipment, but also easily have quality problems such as lack of material in forgings. Summary of the Invention

[0003] In order to solve the above problems, the present invention proposes an innovative blank-making process method, aiming to reduce the feeding weight and material cost of forgings by designing reasonable blank-making tooling and methods, while reducing the impact capacity required by the equipment, ensuring good filling of forgings, and high product consistency.

[0004] The blank-making process method of the present invention mainly includes the following steps: A blank-making process method for a complex forging of ultra-high strength steel for aviation use, including the following steps: Step 1: Upsetting and forming with a swaging die. Select an A-100 ultra-high strength steel bar with a diameter of Φ300mm×(943±10mm), place it in the lower die of the swaging die, cover the upper die of the swaging die, and upset it through a quick forging machine, and then upset it until the upper and lower dies of the swaging die are closed. Step 2: Free forging and flattening the upset blank, flattening it to H = 130±3mm. Step 3: Cut the blank into two symmetrical halves by water jet cutting, and the cutting line is deflected by 22±2° along the short central axis; the production of the blank is completed, and then it can be used for die forging.

[0005] Preferably, the above swaging die includes an upper die and a lower die, and the shapes of the upper and lower dies are the same. An inner cavity is provided in the upper die, and the inner cavity is successively two different frustum cones from top to bottom, and the opening of the inner cavity is chamfered.

[0006] Preferably, among the two different frustum cones of the inner cavity from top to bottom, the angle between the side edge and the vertical line in the cross-section of the upper frustum cone is 8°, and the angle between the side edge and the vertical line in the cross-section of the lower frustum cone is 2°.

[0007] The upper surface of the upper frustum is Φ240mm, the lower surface is Φ327mm, and the lower surface of the lower frustum is Φ350mm.

[0008] The present invention designs a reasonable die forging die: according to the material characteristics of A-100 ultra-high strength steel and the shape complexity of the die forging, a special blanking tooling is designed to optimize the material utilization rate, reduce the feeding weight, and ensure the dimensional accuracy and consistency of the product.

[0009] Optimize the blanking method: use the designed blanking tooling to blank A-100 ultra-high strength steel to form a preform with optimized dimensions. Specifically, the dimensions of the preform are reduced from the traditional Φ300×1098mm to Φ300×(943±10mm), and the blanking weight is reduced by about 15%.

[0010] Die forging forming: forge the optimized preform to form a die forging with a finished product specification of 982×665×150mm. During the die forging process, due to the optimization of the shape and dimensions of the preform, the required impact capacity is significantly reduced, from the traditional 26000T pressure to 18000T pressure or lower, while ensuring good filling of the forging and no lack of material phenomenon. Beneficial effects

[0011] 1. Reduce material consumption and cost: By optimizing the blanking method and tooling design, the material consumption is reduced by 15%.

[0012] 2. Improve equipment utilization rate and reduce energy consumption: The required impact capacity during die forging is reduced by 30%, reducing the dependence on equipment and energy consumption.

[0013] 3. Improve product quality and consistency: The optimized blanking method and tooling design ensure good filling of the forging and no lack of material phenomenon, improving the quality and consistency of the product. Brief description of the drawings

[0014] Figure 1 is a schematic diagram of the forging; Figure 2 is a schematic diagram of step one; Figure 3 is the schematic of step two Figure 1 ; Figure 4 is the schematic of step two Figure 2 ; Figure 5 is a schematic diagram of step three; Figure 6 is a screenshot of the final die forging forming; Figure 7 is a schematic diagram of the upper die of the die forging die; Figure 8 is the original blanking scheme diagram. Detailed implementation manners

[0015] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention. Embodiment 1

[0016] For example, a die forging of a super high-strength steel for aviation, the use is a support frame (as Figure 1 shown), the material is A-100, the finished product specification is 982×665×150mm, according to the original blanking plan, the blanking specification is Φ300×1098mm, the blanking weight is 610kg, and the original blanking plan is to forge into a plate of 900×650×130mm, and then Figure 8 cut it in half by water cutting. For the die forging situation of the original blanking plan, there is incomplete filling in some parts of the forging, and the forging capacity requires a pressure of 26000T. Embodiment 2

[0017] A blanking process method for a complex die forging of a super high-strength steel for aviation, comprising the following steps: Step 1: As Figure 2 shown, perform upsetting forming with a swaging die. Select an A-100 super high-strength steel bar with a diameter of Φ300mm×943.184mm, place it in the lower swaging die of the swaging die, cover the upper swaging die of the swaging die, and perform upsetting through a quick forging machine, and then upset until the upper and lower swaging dies of the swaging die are closed; Step 2: As Figures 3-4 shown, perform free forging and flattening forming on the upset blank, and flatten it to H = 130±3mm; Step 3: As Figure 5 shown, cut the blank into two symmetrical halves by water cutting, and the cutting line is at an angle of 22±2° from the short central axis; the production of the blank is completed, and then it can be used for die forging forming, as Figure 6 shown.

[0018] The swaging die includes an upper swaging die and a lower swaging die, and the shapes of the upper and lower swaging dies are the same. As Figure 7 shown, an inner cavity is provided in the upper swaging die. The inner cavity is successively two different frustum cones from top to bottom, and the opening of the inner cavity is chamfered. Among the two different frustum cones from top to bottom in the inner cavity, the included angle between the side edge and the vertical line in the cross section of the upper frustum cone is 8°, and the included angle between the side edge and the vertical line in the cross section of the lower frustum cone is 2°. The upper table surface of the upper frustum cone is Φ240mm, the lower table surface is Φ327mm, and the lower table surface of the lower frustum cone is Φ350mm.

[0019] After optimizing the blanking plan, the blanking weight is Φ300×936mm, the blanking weight is 520 Kg, the blanking weight is reduced by 90 Kg, a reduction of about 15%. The optimized blanking plan is used for die forging, and the forging is well filled. The forging requires a pressure of 18000 T, and the forming pressure is reduced by 30%.

[0020] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A process for making complex die forgings of ultra-high strength steel for aviation, characterized in that: The following steps are involved: Step 1: Upsetting the tire mold, select Φ300mm×(943±10mm) A-100 ultra-high strength steel bars, place them in the lower tire mold of the tire mold, cover the upper tire mold of the tire mold, upset them through a fast forging machine, and then upset them until the upper and lower molds of the tire mold are closed; Step 2: The roughened blank is subjected to free forging and flattening to H=130±3mm; Step 3: Cut the blank into two symmetrical halves through water jet cutting, with the cutting line being an angle of 22±2° along the short center axis; the blank is completed and can then be used for die forging.

2. The process for making a complex die forging of ultra-high strength steel for aviation according to claim 1, characterized in that: The tire mold comprises an upper tire mold and a lower tire mold, the upper and lower tire molds have the same shape, an inner cavity is arranged in the upper tire mold, the inner cavity is two different frustums from top to bottom, and the inner cavity opening is chamfered.

3. The process for making a complex die forging of ultra-high strength steel for aviation according to claim 2, characterized in that: In the two different frustums from top to bottom of the inner cavity, the angle between the side in the cross section of the upper frustum and the vertical line is 8°, and the angle between the side in the cross section of the lower frustum and the vertical line is 2°.

4. The process for making a complex die forging of ultra-high strength steel for aviation according to claim 3, characterized in that: The upper surface of the upper truncated table is Φ240mm, the lower surface is Φ327mm, and the lower surface of the lower truncated table is Φ350mm.

Images