A method of forming a "Y" class AerMet 100 structural steel swage

Abstract

The present application relates to the field of forging and die design, in particular to a forming method of Y type AerMet100 structural steel die forgings. The method comprises the following steps: blanking the raw material bar to obtain a Y-shaped rough shape; and die forging the Y-shaped rough shape to obtain the Y type AerMet100 structural steel die forgings. The forging forming method guarantees the microstructure and performance of the forgings, improves the utilization rate of raw materials, and reduces the production cost of the forgings.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of forging and die design, in particular to a forming method of a "Y" type AerMet100 structural steel die forging. BACKGROUND

[0002] A-100 steel is a high alloy super high strength steel with the best toughness combination, and is the preferred material for airplane landing gear. The process design window of large airplane landing gear is narrow and difficult, and the reasonable matching between the structure and forming design of the forging and the organization and performance of the forging becomes one of the difficulties for the qualified delivery of the forging.

[0003] The forging material A-100 for a certain airplane landing gear has a forging projection area of about 0.2m 2 The forging belongs to a fork type forging, which is composed of two parts, the front end head is a fork area (similar to a "U" shape), the rear end head is a rod area, the forging has a boss, the cross-sectional size changes greatly, the area ratio of the maximum cross section to the minimum cross section is 5.3, the maximum cross-sectional area is 0.048m 2 , and the minimum cross-sectional area is 0.009m 2 . A large amount of data shows that the deformation of A-100 steel forging needs to be >30%, so that the forging with uniform organization and qualified performance can be obtained. SUMMARY

[0004] The purpose of the application is: the first time of die forging uses hot material for re-melting, the first fire is 960℃, and the small deformation (≥10%) is matched; the first die forging is directly re-melted with hot material, the temperature is continuously raised, the time of the forging in the high temperature section is reduced, and the organization (grain size) and performance of the forging are ensured. Second, the "Y" type AerMet100 structural steel die forging is obtained by upsetting and expanding the bar stock into a "T" type intermediate blank, and then using a special tool to make the "T" type intermediate blank into a "Y" type rough shape, and then die forging the "Y" type rough shape.

[0005] TECHNICAL SCHEME

[0006] A forming method of a "Y" type AerMet100 structural steel die forging is provided, which comprises:

[0007] obtaining a "Y" shaped rough shape by blanking the raw material bar stock;

[0008] obtaining a "Y" type AerMet100 structural steel die forging by die forging the "Y" shaped rough shape;

[0009] Further, the "Y" shaped rough shape is obtained by blanking the raw material bar stock, which comprises:

[0010] upsetting, expanding and thinning the raw material bar stock into a rectangular plate;

[0011] Put the oblong plate into the lower die, use the upper flat anvil to make the blank to obtain the "T" shaped rough shape;

[0012] Put the "T" shaped rough shape into the lower die, use the upper die to make the blank to obtain the "Y" shaped rough shape;

[0013] Die forging the "Y" shaped rough shape to obtain the "Y" type structural steel die forging;

[0014] Further, the "Y" shaped rough shape and the "Y" type structural steel die forging adopt different parting modes:

[0015] The "Y" shaped rough shape adopts plane parting, and the "Y" type structural steel die forging adopts broken line parting.

[0016] Further, the "Y" shaped rough shape needs N times of heating, where N is less than or equal to 2.

[0017] Further, when N = 1, the "Y" shaped rough shape is heated to a preheating temperature of 850 DEG C, kept for a certain time, rapidly heated to 1030 DEG C ~ 1040 DEG C, and the uniformity of the high temperature stage of the heating furnace is controlled within the range of -5 DEG C ~ +5 DEG C.

[0018] Further, when N = 2, the first heating: the "Y" shaped rough shape is first heated to a preheating temperature of 850 DEG C, kept for a certain time, rapidly heated to 960 DEG C ~ 1000 DEG C, and the uniformity of the high temperature stage of the heating furnace is controlled within the range of -10 DEG C ~ +10 DEG C.

[0019] The second heating: after the first heating, the hot material is directly reheated without cooling, rapidly heated to 1000 DEG C ~ 1040 DEG C, kept for a certain time, and the uniformity of the high temperature stage of the heating furnace is controlled within the range of -5 DEG C ~ +5 DEG C.

[0020] Further, the second heating: after the first heating, the hot material is directly reheated without cooling, directly rapidly heated to 1000 DEG C ~ 1040 DEG C, kept for a certain time, and the uniformity of the high temperature stage of the heating furnace is controlled within the range of -5 DEG C ~ +5 DEG C, including:

[0021] Firstly, the hot material is reheated, the first heating is heated to 960 DEG C ~ 1000 DEG C, and the small deformation is matched; after the first heating, the hot material is directly reheated, continuously rapidly heated to 1000 DEG C ~ 1040 DEG C, kept for a certain time, and the "Y" type AerMet100 structural steel die forging is obtained by forging.

[0022] Further, the certain time of the above keeping is half of the keeping time of the first heating.

[0023] Beneficial effects:

[0024] The application is to obtain a T-shaped intermediate blank by upsetting and expanding a bar, and then to obtain a Y-shaped rough shape by bending with a tool, and to obtain a die forging of Y-type AerMet100 structural steel by die forging, compared with conventional forging, the die forging needs to increase the skin on the basis of the die forging, and also needs to remove the skin before delivery to meet the requirements of the forging, the design concept of the application is: first, breaking the traditional design concept, not designing according to the conventional method, increasing the skin in the fork-shaped area for forging, second, re-melting the hot material after the first die forging, continuing to raise the temperature for forging, reducing the holding time of the forging in the high temperature zone to ensure the organization and performance of the forging, third, using a special tool to make a blank, combining the material properties of AerMet100, increasing the deformation of the forging to ensure the organization and performance of the forging, fourth, no skin design, reducing the weight of the forging, increasing the utilization rate of raw materials, eliminating the removal process of the skin of the forging, reducing the production cost, and improving the production efficiency of the forging. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1-1 It is a schematic view of the shaft side of the die forging of Y-type AerMet100 structural steel of the application;

[0026] Figure 1-2 It is a broken line parting surface of the die forging of Y-type AerMet100 structural steel of the application;

[0027] Figure 2 It is a schematic view of the T-shaped rough shape in tool 1 of the application;

[0028] Figure 3 It is a structural schematic view of the T-shaped rough shape forming Y-shaped rough shape of the application;

[0029] Among them, 1 is the upper anvil of tool 1, 2 is the lower die of tool 1, 3 is the T-shaped intermediate blank, 4 is the upper die of tool 2, 5 is the lower die of tool 2, and 6 is the Y-shaped rough shape. DETAILED DESCRIPTION

[0030] For such forgings, the conventional method is to increase the skin in the fork-shaped area of the forging, and to directly make a blank and die forge with a bar to realize the forming of the forging. The application adopts a special tool to make a blank and die forge to obtain a Y-type structural steel die forging, and after adjusting the forging parameters, a forging with uniform organization and qualified performance is obtained. The design of the application improves the material utilization rate of the forging and saves the production cost.

[0031] The application provides a forming method of Y-type AerMet100 structural steel die forging, comprising:

[0032] After the bar is upset along the streamline direction to form a square plate, a "Y" type die is used to press and bend the "T" type intermediate blank to obtain a "Y" shaped rough shape;

[0033] The "Y" shaped rough shape is forged to obtain a "Y" type AerMet100 structural steel die forging;

[0034] Further, the raw material bar needs two heating times to form a rough shape, the first heating time is that the bar is preheated to 850 DEG C, heated for a period of time, rapidly heated to 1130 DEG C, and the second heating time is that the "T" type intermediate blank is made into a "Y" type rough shape by using a special die, the "T" type intermediate blank is heated to a preheating temperature of 850 DEG C, kept for a period of time, rapidly heated to 960 DEG C, heated for a period of time (half of the heating time), the heat preservation time of the hot charge is halved, and the furnace temperature uniformity of the heating furnace is controlled to be ± 10 DEG C; the "Y" shaped rough shape is obtained, and in order to position the subsequent die forging, the end of the fork-shaped area and the rear end of the rod of the forging are positioned.

[0035] Further, the "Y" shaped rough shape is designed to adopt a different die splitting mode from the "Y" type AerMet100 structural steel die forging. The "Y" shaped rough shape is designed to adopt a plane die splitting mode, and the die splitting mode of the "Y" type AerMet100 structural steel die forging is a broken line die splitting mode. In order to position the subsequent die forging, the end of the fork-shaped area and the rear end of the rod of the "Y" shaped rough shape are positioned to ensure that the rough shape does not move in the length direction in the process of pressing and bending.

[0036] Further, the "Y" shaped rough shape is formed into a "Y" type AerMet100 structural steel die forging. The "Y" type AerMet100 structural steel die forging needs two heating times, the first heating time is that the "Y" type rough shape is preheated to 850 DEG C, kept for a period of time, rapidly heated to 960 DEG C, kept for a period of time, and the furnace temperature uniformity of the heating furnace is controlled to be ± 5 DEG C; the second heating time is that the forging is rapidly heated to 1030 DEG C, the uniformity of the high-temperature stage of the heating furnace is controlled to be ± 5 DEG C, and the second heating time of the forging is hot charge, and the hot charge time is halved. According to the characteristics of the A-100 material, the deformation amount of the forging needs to be ≥ 30% to ensure the organization and performance of the forging. The present application uses hot charge for the first time, the first heating time is 960 DEG C, and the small deformation (≥ 10%) is matched. After the first heating time die forging is finished, the hot charge is continued to rapidly heat, the time of the forging in the high-temperature stage is reduced, and the organization (grain size) and performance of the forging are ensured.

[0037] Further, the Y type AerMet100 structural steel die forgings are obtained after heat treatment (normalizing + high temperature tempering) of the Y type AerMet100 structural steel die forgings, sampling is carried out in the sample area after heat treatment, and qualified organization and performance are obtained after quenching + cold treatment + tempering, so that the qualified Y type AerMet100 structural steel die forgings are obtained.

[0038] Further, the first threshold value is 1030-1040℃;

[0039] Further, the second threshold value is -5-+5℃;

[0040] Further, the third threshold value is 960-1000℃;

[0041] Further, the fourth threshold value is -10-+10℃;

[0042] Further, the fifth threshold value is 1000-1040℃;

[0043] Further, the sixth threshold value is half of the holding time of the first fire;

[0044] Embodiment:

[0045] The shape of the forging (as shown in Figure 1-1 The profile size of this forging is 1350mm long, 415mm wide and 211mm high. The forging is a broken line parting (as shown in Figure 1-2 The piston rod forging belongs to a fork type forging, which is composed of two parts. The front end head is a fork area, and the rear end head is a rod area. The forging has a boss, and the cross-sectional size changes greatly. The ratio of the maximum cross-sectional area to the minimum cross-sectional area is 5.3. The maximum cross-sectional area is 0.048m 2 , and the minimum cross-sectional area is 0.009m 2 . The fork area of the forging is about 450mm long, 415mm wide, and the wall thickness is only 50-90mm. The forming difficulty of this area of the forging is very great. After the bar Φ300×375 is heated, the 16MN free forging press is used to upset and square 832mm×290mm×110mm along the streamline direction of the raw material bar. Then, a special tool 1 (as shown in Figure 2 ) is used to locally thin the plate blank (as shown in Figure 2 2) to obtain a "T" shaped intermediate plate blank. A special tool 2 (as shown in Figure 3 ) is used to press and bend to obtain a "Y" shaped rough shape (as shown in Figure 3 ) required size, and the thickness is adjusted. A template or die is used to check the "Y" shaped rough shape (as shown in Figure 3The parting surface of the "Y" shaped rough shape is a flat parting. The "Y" shaped rough shape is completed by two heats, and the heating equipment is an electric furnace. The specific heating schedule is as follows: first heat: heated to a preheating temperature of 850 DEG C x 90 min, and then rapidly heated to 1030 DEG C x 105 min; second heat: heated to a preheating temperature of 850 DEG C x 50 min, and then rapidly heated to 960 DEG C x 60 (30) min, and the hot charge is allowed to be recycled, and the holding time of the hot charge recycling is halved; after the "Y" shaped rough shape is heated, the die forging is completed on a 365 MN electric screw press, and the "Y" shaped rough shape is completed by two heats, and the specific heating schedule is as follows: first heat: 960 DEG C x 60 min, and second heat: 1030 DEG C x 60 (30) min, and the hot charge is allowed to be recycled between the two heats, and the holding time of the hot charge recycling is halved; finally, the "Y" shaped AerMet100 structural steel die forging (as shown in Figure 1-1 ).

[0046] The "Y" shaped AerMet100 structural steel die forging is produced according to the process, and the product qualified rate is more than 99%, the "Y" shaped AerMet100 structural steel die forging has good filling, the structure of the forging is uniform, and the performance also has a certain amount of surplus.

Claims

1. A method of forming a "Y" class AerMet 100 structural steel swage, characterized by, Comprise: The blanking of the raw material bar to obtain a "Y" shaped rough shape, wherein the blanking of the raw material bar to obtain a "Y" shaped rough shape comprises: roughing, spreading and thinning the raw material bar into a rectangular plate; putting the rectangular plate into a lower die, and blanking using an upper flat anvil to obtain a "T" shaped rough shape; putting the "T" shaped rough shape into a lower die, and blanking using an upper die to obtain a "Y" shaped rough shape; wherein the "Y" shaped rough shape and the "Y" type structural steel die forging adopt different parting modes, the "Y" shaped rough shape adopts flat parting, and the "Y" type structural steel die forging adopts fold line parting; and the "Y" shaped rough shape requires 2 heating times for die forging; first time: the "Y" shaped rough shape is heated to a preheating temperature of 850 DEG C, kept for a certain time, rapidly heated to 960 DEG C-1000 DEG C, and the uniformity in the high temperature stage of the heating furnace is controlled within -10 DEG C to +10 DEG C; second time: after the first time of die forging, the hot material is directly returned to the furnace without cooling, rapidly heated to 1000 DEG C-1040 DEG C, kept for a certain time, and the uniformity in the high temperature stage of the heating furnace is controlled within -5 DEG C to +5 DEG C; wherein the second time of die forging specifically comprises: after the first time, the forging is directly returned to the furnace with hot material, continuously rapidly heated to 1000 DEG C-1040 DEG C, kept for a certain time, and the "Y" type AerMet100 structural steel die forging is obtained by forging; the "Y" shaped rough shape is die forged to obtain a "Y" type AerMet100 structural steel die forging; the first time is heated to 960 DEG C-1000 DEG C, and small deformation is matched, and the small deformation is 10% of the total deformation of 30% of the die forging.

2. The method of claim 1, wherein, The certain time of keeping in the second time of die forging is half of the keeping time in the first time of die forging.

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