A forming method for long strip-shaped large-scale die-forged titanium alloy parts with ribs

Abstract

The application discloses a forming design method suitable for long strip type titanium alloy large-scale die forging with ribs, which comprises the following steps: (1) selecting a cylindrical bar as the raw material of a blank; (2) using a hammer anvil to press down the blank, and performing blanking in three heats, and corresponding blanks are obtained according to a blanking drawing; (3) performing die forging on the blank obtained in the step (2), and the die forging is performed in two heats, the blank is placed in a die cavity when the die forging is performed in the first heat, a first hammer is used for light positioning, then a second hammer is used, and then a backing plate is used to control the pressing-down amount, so that the deformation amount of each heat is uniform and controllable; and the first hammer is directly used to press down the blank to the required size of the forged piece when the die forging is performed in the second heat. Through the optimized design of blanking, the striking force required by the equipment is reduced by 45%, and the requirement that the product streamline is consistent with the shape of the forged piece is achieved; compared with conventional forming forgings, the optimized blanking method saves 50% of the material, reduces the processing cycle and cost by nearly 30%, and improves the product qualification rate by nearly 30%.

Description

TECHNICAL FIELD

[0001] The application discloses a forming method for a long-strip-shaped titanium alloy large-scale die forging with ribs and belongs to the technical field of die forging. BACKGROUND

[0002] At present, many die forging manufacturers directly die forge round bar materials for many long-strip-shaped forgings with ribs, but the cross-sectional size of the long-strip-shaped forgings with ribs is greatly different, the width-depth ratio of the die cavity at the rib is large, the material is difficult to fill the high-point cavity of the die, the forgings are prone to folding defects, and the qualified rate is difficult to improve.

[0003] The material utilization rate of the titanium alloy forgings is low during die forging, the material utilization rate is low during die forging of the round bar materials, a large amount of flash is prone to being generated, energy required for die forming is higher, and equipment and die loss is greatly increased. SUMMARY

[0004] In order to overcome the above-mentioned defects, the application aims to design a reasonable blank, so that metal is distributed along the shape of the forging, the required striking capacity of the equipment is reduced, a reasonable blanking tool and die are designed, and a defect-free die forging processing method is achieved.

[0005] The technical scheme of the application is as follows:

[0006] A forming method for a long-strip-shaped titanium alloy large-scale die forging with ribs comprises the following steps:

[0007] (1) selecting a cylindrical bar as the raw material of the blank;

[0008] (2) the blank is pressed down by a hammer anvil, blanking is performed in three heats, and the corresponding blank is obtained according to a blanking drawing;

[0009] (3) the blank obtained in step (2) is die forged, the die forging is performed in two heats, the blank is placed in the die cavity during the first heat, the first hammer is lightly hit to position, then the pressing amount is controlled by using a pad to ensure that the deformation amounts of the second hammer and the third hammer are uniform and controllable, and the first hammer is directly pressed to forge the forging to the required size during the second heat.

[0010] Preferably, one end of the blank is a large-size square block, the other end is a small-size long strip, the deformation amount of the first heat square section is controlled to be 70-29%, the height deformation amount is controlled to be 202-33%, the deformation amount of the second heat small-size long strip section is controlled to be 55-31%, the height deformation amount is controlled to be 215-26%, the deformation amount of the third heat small-size long strip section is controlled to be 30-25%, and the height deformation amount is controlled to be 195-19%, wherein the deformation amount is the ratio of the difference between the deformation before and after deformation and the number after deformation.

[0011] Preferably, the first hammer of the first die forging is controlled at 10-15% of the equipment down pressure, the second hammer is controlled at 25-30% of the equipment down pressure, and the third hammer is controlled at 30-35% of the equipment down pressure, wherein the equipment down pressure is 8000T.

[0012] Preferably, the first hammer of the second die forging is controlled at 85-95% of the equipment down pressure, and the equipment down pressure is 8000T.

[0013] The beneficial effects of the present application are:

[0014] (1) Through the optimized design of the blank, the equipment demand is reduced by 45%, and the product streamline is consistent with the shape of the forging;

[0015] (2) Through the optimized blanking method, 50% of the material is saved compared with the conventional forming forging, the processing cycle and cost are reduced by nearly 30%, and the product qualification rate is improved by nearly 30%. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the blanking process diagram of step (2) of the present application, and the size unit is mm;

[0017] Figure 2 is a structural schematic diagram of a bar material;

[0018] Figure 3 is a structural schematic diagram of a blank;

[0019] Figure 4 is a structural schematic diagram of step (3), and the yellow part in the figure is a blank;

[0020] Figure 5 、 Figure 6 is a structural schematic diagram of a die;

[0021] Figure 7 is a schematic diagram of a forging. DETAILED DESCRIPTION

[0022] The present 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 present application, and cannot be used to limit the protection scope of the present application. EMBODIMENT

[0023] For example, a large die forging with a ribbed rib of a certain type of aircraft titanium alloy, the material is TC4-DT, and the forging shape is shown in Figure 7 The production process is as follows:

[0024] (I) As shown in Figure 1 , the blank is made:

[0025] (1), choose cylindrical bar as the raw material of blank, the bar is as shown in Figure 2 ;

[0026] (2), the blank is pressed by hammer anvil, and the blank is made in three fires, the corresponding blank is made according to the blank drawing, and the structure diagram of the blank is as shown in Figure 3 .

[0027] (II), die forging

[0028] (3), the blank made in step (2) is die forged, as shown in Figure 4 , the die forging is divided into two fires, the blank is placed in the mold cavity in the first fire of die forging, the mold is as shown in Figure 5 , Figure 6 , the first hammer is lightly hit for positioning, the pressing amount is 800T, the pressing amount is controlled by using a pad, a 25mm pad is used, the second hammer is hit, the pressing amount is 2400T, a 15mm pad is used, the second hammer is hit, the pressing amount is 2800T, so that the deformation amount of each hammer is uniform and controllable; in the second fire of die forging, the first hammer directly presses to the required size of the forged piece as shown in Figure 7 , and the pressing amount is 7200T.

[0029] The above is only the preferred embodiment of the present application, it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, these improvements and modifications should also be considered as the protection scope of the present application.

Claims

1. A method for forming a large-scale die-forged member of a titanium alloy strip-shaped product with ribs, characterized by It comprises the following steps: (1) selecting cylindrical bar as the raw material of the blank; (2) the blank is pressed by using anvil, and the blank is made by three fires according to the blank drawing; One end of the blank in the step (2) is a large-size square, and the other end is a small-size strip, the deformation amount of the first fire square section is controlled to be 70-29%, the height deformation amount is controlled to be 202-33%, the deformation amount of the second fire small-size strip section is controlled to be 55-31%, the height deformation amount is controlled to be 215-26%, the deformation amount of the third fire small-size strip section is controlled to be 30-25%, and the height deformation amount is controlled to be 195-19%, wherein the deformation amount is the ratio of the difference before and after deformation to the number after deformation; (3) the blank made in the step (2) is die forged, and the die forging is divided into two fires, the blank is placed in the die cavity during the first fire, the first hammer is lightly hit for positioning, then the die forging is controlled by using the pad to control the pressing amount, so that the deformation amounts of the second hammer and the third hammer are uniform and controllable; during the second fire, the first hammer directly presses to forge to the required size of the forged piece; The pressing amount of the first hammer of the first fire in the step (3) is controlled to be 10-15% of the pressing amount of the equipment, the pressing amount of the second hammer is controlled to be 25-30% of the pressing amount of the equipment, and the pressing amount of the third hammer is controlled to be 30-35% of the pressing amount of the equipment, wherein the pressing amount of the equipment is 8000T; The pressing amount of the first hammer of the second fire in the step (3) is controlled to be 85-95% of the pressing amount of the equipment, and the pressing amount of the equipment is 8000T.

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