A forming design method suitable for triangular titanium alloy die forgings

Abstract

The application discloses a forming design method suitable for triangular titanium alloy die forgings, which comprises the following steps: (1) selecting a cylindrical bar as the raw material of a blank; (2) using an upper and lower drop hammer to press and draw a cone to obtain a blank two; (3) inserting the blank two obtained in the step (2) into a mould, pressing with a hammer anvil, and forging to obtain a blank three; (4) lightly pressing the upper and lower surfaces of the blank three with the hammer anvil to obtain a blank four required by the forging; and (5) performing die forging on the blank four obtained in the step (4), and the die forging is performed in two heats; in the first heat, the blank is placed in a mould cavity, a first hammer is lightly hit to position, then a second hammer is performed, and then a backing plate is used to control the pressing amount, so that the deformation amount of each heat is uniform and controllable; and in the second heat, the first hammer directly presses to forge to the required size of the forging. Through the optimized design of blank preparation, the striking force required by the equipment is reduced by 25%, and the requirement that the product streamline is consistent with the shape of the forging is achieved; through the optimized blank preparation mode, 30% of the material is saved compared with conventional forming forgings, the processing cycle and cost are reduced by nearly 20%, and the product qualification rate is increased by nearly 10%.

Description

Technical Field

[0001] This invention discloses a forming design method applicable to triangular titanium alloy forgings, belonging to the field of forging technology. Background Technology

[0002] Currently, many similar triangular forgings in the die forging field have low material utilization and high forming difficulty during die forging. Many die forging manufacturers mostly use round bars for direct die forging. However, triangular forgings have large differences in interface dimensions, resulting in low material utilization during die forging, higher forming energy requirements, and increased wear and tear on equipment and dies.

[0003] In order to improve the utilization rate of forging materials, most of them rely on manual billet forming. However, this results in low production efficiency, poor dimensional consistency, and the forming effect is not ideal for forgings with large differences in cross-sectional area. Summary of the Invention

[0004] To overcome the above shortcomings, the purpose of this invention is to design a reasonable blank so that its metal is distributed along the shape of the forging and to reduce the impact force required by the equipment. It also aims to design reasonable blanking tooling and molds to achieve a die forging process with minimal blank material and no defects.

[0005] The technical solution of the present invention is as follows:

[0006] A method for designing and forming triangular titanium alloy forgings includes the following steps:

[0007] (1) Select cylindrical bar stock as the raw material for billet one;

[0008] (2) The billet one is pressed down with a cone by the upper and lower shovels to obtain billet two;

[0009] (3) Insert the billet two obtained in step (2) into the mold, press down with the hammer and anvil, and forge into billet three;

[0010] (4) Use a hammer and anvil to lightly press the upper and lower surfaces of the billet to make the billet four required for forging;

[0011] (5) The billet obtained in step (4) is forged in two stages. In the first stage of forging, the billet is placed in the mold cavity, the first hammer is used to lightly position it, and then the second hammer is used. The pressing amount is controlled by the pad to ensure that the deformation amount of each stage is uniform and controllable. In the second stage of forging, the first hammer is used to directly press down to forge to the required size of the forging.

[0012] Preferably, one end of the above-mentioned blank two is cylindrical and the other end is conical. The deformation of the circular cross-section of the conical end is controlled at 38-63%, and the height deformation is controlled at 19-24%. The deformation is the ratio of the difference before and after deformation to the value after deformation.

[0013] Preferably, the blank three has two conical sections, the deformation of the upper end face is controlled in 17-35%, the deformation of the height is controlled in 58-66%, and the deformation of the lower end face is controlled in 6-26%, the deformation being the ratio of the difference before and after deformation to the number after deformation.

[0014] Preferably, the tire mold in step (3) is cylindrical, the tire film has an upper hole, and the inside is shaped as the blank three.

[0015] Preferably, the first hammer of the first die forging has a pressing force of 8-12% of the pressing force of the equipment, and the second hammer has a pressing force of 30-40% of the pressing force of the equipment, wherein the pressing force of the equipment is 2000T.

[0016] Preferably, the first hammer of the second die forging has a pressing amount of 55-65% of the pressing amount of the equipment, and the pressing force of the equipment is 2000T.

[0017] The beneficial effects of the present application are:

[0018] (1) Through the optimized design of the blank, the required striking force of the equipment is reduced by 25%, and the product streamline is consistent with the shape of the forging;

[0019] (2) Through the optimized blanking method, 30% of the material is saved compared with the conventional forming forging, the processing cycle and cost are reduced by nearly 20%, and the product qualification rate is improved by nearly 10%. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is the blanking process diagram of steps (1)-(3) of the present application, and the size unit is mm;

[0021] Figure 2 is a structural schematic diagram of the blank one;

[0022] Figure 3 is a structural schematic diagram of the blank two;

[0023] Figure 4 is a structural schematic diagram of the blank three;

[0024] Figure 5 is a three-dimensional structural schematic diagram of the tire mold;

[0025] Figure 6 is a plan view of the tire mold;

[0026] Figure 7 is a schematic diagram of step (4), and the yellow part in the figure is the blank;

[0027] Figure 8 is a schematic diagram of step (5), and the yellow part in the figure is the blank;

[0028] Figure 9 is a structural schematic diagram of a die;

[0029] Figure 10 is a schematic diagram of a forged piece. DETAILED DESCRIPTION

[0030] The application will be further described below in conjunction with the drawings. The following examples are only used to more clearly illustrate the technical solutions of the application, and cannot be used to limit the protection scope of the application. EXAMPLE

[0031] For example, a triangular-shaped forged piece of a certain type of aircraft titanium alloy, the material is TC4-DT, the forged piece shape is shown in Figure 10 The production process is as follows:

[0032] (I) As shown in Figure 1 , a blank is made:

[0033] (1) Select a cylindrical bar as the raw material of the blank 1, the blank 1 is shown in Figure 2

[0034] (2) The blank 1 is used to press down and pull the cone with an upper and lower flinger to obtain a blank 2, the blank 2 is shown in Figure 3

[0035] (3) The blank 2 obtained in step (2) is inserted into a die, the die is shown in Figures 5-6 , the anvil is pressed down, and the blank is forged into a blank 3, the blank 3 is shown in Figure 4

[0036] (II) Die forging

[0037] (4) The blank 3 is lightly pressed on the upper and lower surfaces with the anvil to control the thickness H≈80mm to obtain a blank 4 required for the forged piece, as shown in Figure 7

[0038] (5) The blank 4 obtained in step (4) is die forged, as shown in Figure 8 , the die forging is divided into two heats, in the first heat, the blank is placed in the die cavity, the die is shown in Figure 9 , the first hammer is lightly hit to position, the pressing force is 200T, then the second hammer is used, the pressing force is 700T, then the gasket is used to control the pressing amount, and 8-10mm of under-pressing is reserved to ensure that the deformation amount of each heat is uniform and controllable; in the second heat, the first hammer directly presses down to forge the forged piece to the required size shown in Figure 10 , the pressing force is 1200T.

[0039] ​​​​The above merely describes the preferred embodiments of the present application, and it should be pointed out that, for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A method for forming design of a triangular titanium alloy die forging, characterized in that It comprises the following steps: (1) selecting a cylindrical bar as the raw material of the blank; (2) using an upper and lower drop hammer to press the blank to obtain a second blank; (3) inserting the second blank obtained in step (2) into a die, pressing with an anvil, and forging to obtain a third blank; (4) lightly pressing the upper and lower surfaces of the third blank with an anvil to obtain a fourth blank required for the forged part; (5) performing die forging on the fourth blank obtained in step (4), and the die forging is performed in two heats; in the first heat, the blank is placed in the die cavity, the first hammer is lightly hit for positioning, then the second hammer is performed, and then the gage plate is used to control the pressing amount to ensure that the deformation amount of each heat is uniform and controllable; in the second heat, the first hammer directly presses to the required size of the forged part; one end of the second blank is cylindrical, and the other end is conical, the deformation amount of the circular cross section of the conical end is controlled to be 38-63%, and the height deformation amount is controlled to be 19-24%, the deformation amount being the ratio of the difference before and after deformation to the number after deformation; the third blank has two conical sections, the deformation amount of the upper end face is controlled to be 17-35%, the height deformation amount is controlled to be 58-66%, and the deformation amount of the lower end face is controlled to be 6-26%, the deformation amount being the ratio of the difference before and after deformation to the number after deformation.

2. The method for forming design of a triangular titanium alloy die forging according to claim 1, wherein The die in step (3) is cylindrical, and the die has a hole at the upper end, and the inside is shaped according to the third blank.

3. The method for forming design of a triangular titanium alloy die forging according to claim 1, wherein The pressing force of the first hammer in the first heat of die forging is controlled to be 8-12% of the pressing force of the equipment, and the pressing force of the second hammer is controlled to be 30-40% of the pressing force of the equipment, wherein the pressing force of the equipment is 2000T.

4. The method for forming design of a triangular titanium alloy die forging according to claim 1, wherein The pressing amount of the first hammer in the second heat of die forging is controlled to be 55-65% of the pressing amount of the equipment, and the pressing force of the equipment is 2000T.

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