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A high-efficiency forging method for fine-grained large-scale die forgings of high-alloy ultra-high-strength steel

A technology for ultra-high-strength steel and die forgings, which is applied in the manufacture of large-scale die forgings, and in the field of fine-grained and efficient forging of large-scale die forgings of high-alloy ultra-high-strength steel, which can solve the problem that the final forging deformation is small and the grain size of forgings is difficult to achieve Level 8 and other issues to achieve the effect of improving production efficiency and promoting application prospects

Active Publication Date: 2016-08-24
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that the quality consistency is good, and the disadvantage is that the final forging deformation is small, and the grain size of the forging is difficult to reach the level of 8.
At present, there is no large-scale die forging of high-alloy ultra-high-strength steel with a grain size of 8 grades at home and abroad.

Method used

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  • A high-efficiency forging method for fine-grained large-scale die forgings of high-alloy ultra-high-strength steel
  • A high-efficiency forging method for fine-grained large-scale die forgings of high-alloy ultra-high-strength steel
  • A high-efficiency forging method for fine-grained large-scale die forgings of high-alloy ultra-high-strength steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Billet making

[0019] Raw materials: A-100 steel bars with a diameter of Φ300mm, see Table 1 for the chemical composition. The experiment takes 4 forgings as a batch.

[0020] Table 1 A-100 steel bar chemical composition (%wt)

[0021]

[0022] Processing equipment: the heating furnace adopts a box-type resistance furnace, and the forging equipment adopts a 3150-ton fast forging machine;

[0023] Heating system: 1045°C, holding time 135min, the specific system is as follows figure 1 As shown, set a temperature sensor on the billet and ensure that the temperature displayed by the sensor does not exceed 1050 °C;

[0024] Deformation system: the deformation amount of each part in a single firing time is more than 30%, but not more than 70%; the deformation speed is controlled at 20-40mm / s; the stop forging temperature: 820℃~850℃;

[0025] Cooling method: air cooling after forging;

[0026] Single billet making time: 14min~18min.

[0027] (2) die forging

[0...

Embodiment 2

[0045] (1) Billet making

[0046] Raw materials: High-alloy ultra-high-strength steel rods with a diameter of Φ200mm, the chemical composition is shown in Table 5. Three forgings were used as a batch in the experiment.

[0047] Table 5 Chemical composition of high-alloy ultra-high-strength steel bars (wt%)

[0048]

[0049] Processing equipment: the heating furnace adopts a box-type resistance furnace, and the forging equipment adopts a 3150-ton fast forging machine;

[0050] Heating system: 1040°C, holding time 110min, the specific system is as follows figure 1 As shown, set a temperature sensor on the billet and ensure that the temperature displayed by the sensor does not exceed 1045°C;

[0051] Deformation system: Deformation amount of each part in a single firing time: more than 30%, but not more than 70%; deformation speed is controlled at 30-50mm / s; stop forging temperature: 820℃~840℃;

[0052] Cooling method: air cooling after forging;

[0053] Single billet mak...

Embodiment 3

[0071] (1) Billet making

[0072] Raw materials: A-100 steel bars with a diameter of Φ300mm, see Table 9 for the chemical composition. The experiment takes 4 forgings as a batch.

[0073] Table 9 A-100 steel bar chemical composition (%wt)

[0074]

[0075] Processing equipment: the heating furnace adopts a box-type resistance furnace, and the forging equipment adopts a 1600-ton fast forging machine;

[0076] Heating system: 1045°C, holding time 135min, the specific system is as follows figure 1 As shown, set a temperature sensor on the billet and ensure that the temperature displayed by the sensor does not exceed 1050 °C;

[0077] Deformation system: Deformation amount of each part in a single firing time: more than 30%, but not more than 70%; deformation speed is controlled at 15-50mm / s; stop forging temperature: 820℃~840℃;

[0078] Cooling method: air cooling after forging;

[0079] Single billet making time: 14min~18min.

[0080] (2) die forging

[0081] Processin...

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Abstract

The invention belongs to the technical field of forging and relates to a grain refining efficient forging method of high-alloy ultrahigh-strength steel large-scale die-forged parts. The method is used for machining large-scale die-forged parts such as an airplane landing gear and includes the steps of shearing billets, heating, manufacturing billets, heating and die forging. The method has the advantages that the grain refining efficient forging method of the high-alloy ultrahigh-strength steel large-scale die-forged parts is researched for the first time, the forged parts acquire 8-level grains while the production efficiency of the forged parts is 5-8 times of that of conventional forged part production, and noises during production is reduced by more than 30 decibel; the high thermoplasticity of high-alloy high-strength steel is combined with a fast forging machine and a large hydraulic machine, billet manufacturing and die forging heating number deformation amount are reasonably distributed, and the grain refining forging method of the large-scale forged parts is formed.

Description

technical field [0001] The invention belongs to the technical field of forging, and relates to a fine-grained and high-efficiency forging method for large-scale die forgings of high-alloy ultra-high-strength steel, which is used for manufacturing large-scale die forgings such as aircraft landing gear. technical background [0002] Large-scale die forgings similar to aircraft landing gear generally weigh more than 200 kilograms and less than 1 ton, and have complex shapes. At present, high-alloy ultra-high-strength steel is mostly used. Generally, the following two methods are adopted for the manufacture of large-scale die forgings of ultra-high strength steel: 1) Billet making on the hammer + die forging on the hammer. Its characteristic is that the amount of deformation is small each time, and it takes multiple fires to complete the billet making and die forging respectively. In this way, the structure of the forging is often relatively coarse, the grain size is 5-7, and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21J1/04B21J1/06B21J5/02
Inventor 李志王海鹏古立新高谦赵振业
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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