CN-121972593-A - Forming method of metal fixed control surface body for aircraft

CN121972593ACN 121972593 ACN121972593 ACN 121972593ACN-121972593-A

Abstract

The invention discloses a forming method of a metal fixed control surface body for an aircraft, which comprises the steps of firstly forging a forging blank, processing the forging blank into an approximately square blank, then returning to a furnace for heating and preserving heat, S2, carrying out material distribution, square striking, chamfering, rounding and drawing to obtain a special-shaped solid blank A, S3, returning the special-shaped solid blank A to the furnace for heating, preheating a forming lower die, putting the special-shaped solid blank A which is heated and fully preserved in the forming lower die, enabling a large end to be flat and downward, sleeving a small end step shaft into an upper sleeve, uniformly pressing an upper anvil block downwards along with a hydraulic machine to obtain a special-shaped solid blank B, S4, placing a punch at the center of a hole of the upper sleeve, and punching a blind hole on the small end of the special-shaped solid blank B by using the force of the upper anvil block to obtain the final metal fixed control surface body forging for the aircraft. The invention can ensure that the fiber direction of the forging is distributed along with the shape and is complete, the machining allowance is small, the mechanical property and the service life are improved, and the invention has the characteristics of high temperature resistance, high pressure resistance and corrosion resistance and the advantages of low cost.

Inventors

ZHAO HEAN
Zhou Pengliang
DU LIJUN
LIU TAO
LI ZHENGCHENG

Assignees

贵州航天群建精密机械有限公司

Dates

Publication Date: 20260505
Application Date: 20260206

Claims (5)

1. A molding method of a metal fixed control surface body for an aircraft is characterized by comprising the following steps: S1, heating a raw material blank to 900-1150 ℃, forging the forging blank on a free forging press to form a blank, upsetting, drawing and flattening the blank into a square blank (4) by using upper and lower flat anvils, and then returning to a furnace for heating and preserving heat; s2, discharging the square blank (4) which is heated and kept in place for continuous forging, firstly, dividing the blank by a cutter, performing square chamfering and rounding on the small end part of the divided blank, then performing rounding and drawing out on the rounded part again to obtain step shafts with different sections, and finally obtaining a special-shaped solid blank A (5) of the large-end flat square small-end step shaft; S3, returning the special-shaped solid blank A (5) to a furnace for heating, wherein the heating temperature is less than or equal to 1100 ℃, preserving heat for a certain time, preheating a forming lower die (2) to 250-350 ℃, smearing a release agent in a die cavity of a grinding tool, then integrally moving the forming lower die (2) to a hydraulic machine working platform and directly below an upper anvil of the hydraulic machine, clamping the small end of the special-shaped solid blank A (5) by a manipulator, putting the heated and fully preserved special-shaped solid blank A (5) into the forming lower die (2), enabling the large end to be flat and downward, sleeving a small end step shaft into an upper sleeve (1), uniformly pressing down by the upper anvil along with the hydraulic machine, transmitting the pressure to the upper sleeve (1), and forming the large end of the special-shaped solid blank A (5) along with the inner cavity of the forming lower die (2) under the pressure of the upper sleeve (1), so as to obtain a special-shaped solid blank B (6); And S4, placing the punch head (3) at the center of the hole of the upper sleeve (1), and punching a blind hole on the small end of the special-shaped solid blank B (6) by using an upper anvil block to apply force to obtain the final metal control surface body forging (7) for the aircraft.
2. The method for forming the metal control surface body for the aircraft according to claim 1, wherein the S4 forging is finished, and immediately spraying water cooling on the metal control surface body forging (7) and then carrying out solid solution aging heat treatment.
3. The method for forming the metal control surface body for the aircraft, which is characterized in that the raw materials are smelted by adopting a vacuum induction furnace, electroslag remelting and vacuum consumable arc remelting, the smelted raw materials are used for detecting chemical components, and the mass fraction of each chemical component is less than or equal to 0.08% of C, 18.5% -20.0% of Cr, 5.50% -7.00% of W, 3.50% -4.50% of Mo, 2.10% -2.40% of Al, 1.20% -1.50% of Ti, 6.00% -8.00% of Co, less than or equal to 1.00% of Fe, less than or equal to 0.005% of B, less than or equal to 0.02% of Ce, less than or equal to 0.40% of Mn, less than or equal to 0.50% of Si, less than or equal to 0.015% of P, less than or equal to 0.015% of S and less than or equal to 0.010% of Mg.
4. The method for forming the metal control surface body for the aircraft according to claim 1, wherein in the step S1, upsetting, drawing and flattening are carried out by using upper and lower flat anvils to form a square blank (4), and then the blank is returned to an oven for heating to 900-1150 ℃ and heat preservation is carried out for 2-2.5 h.
5. The method for forming the metal fixed control surface body for the aircraft according to claim 1, wherein in the step S3, the special-shaped solid blank A (5) is returned to the furnace for heating, the heating temperature is less than or equal to 1100 ℃, and the heat is preserved for 1-1.5 h.

Description

Forming method of metal fixed control surface body for aircraft Technical Field The invention relates to a forming method of a metal fixed control surface body for an aircraft, and belongs to the technical field of forging and manufacturing. Background The metal fixed control surface body is a structural member which is used on an aircraft and has asymmetric upper and lower ends and inner holes, and is made of GH4099 high-temperature alloy, and has very high requirements on high temperature resistance, high pressure resistance, corrosion resistance, low internal defects and comprehensive mechanical properties. The traditional manufacturing method of the metal control surface body generally adopts a die forging mode to form a solid blank, the round bar blank is directly heated and then is directly formed in a die cavity through a die forging press, and then the internal redundant allowance is processed through turning, drilling, milling and other modes. At present, a forging metal streamline can be distributed along with the shape of a die cavity of a die, but because the material is GH4099, the deformation resistance is large during forging, in addition, because the projection area of vertical positive pressure is large during forming, the requirement on the pressure of a die forging press is very high, the die is easy to damage, the service life of the die is prolonged, and the production cost is increased. Meanwhile, because the forging is a solid blank, the machining allowance is too large, a large amount of time is required for machining, and the waste of raw materials is also caused. Disclosure of Invention The invention aims to provide a method for forming a metal fixed control surface body for an aircraft. The special free forging technology is adopted to realize the processing of the solid blank of the traditional large-tonnage die forging, and then the blank with the inner hole is forged by a proper die and forging forming technology, so that the fiber direction of the forging is distributed along with the shape and is complete, the machining allowance is small, the mechanical property and the service life are improved, the high-temperature resistance, the high-pressure resistance and the corrosion resistance are realized, and the cost is low. The technical scheme of the invention is that the forming method of the metal fixed control surface body for the aircraft comprises the following steps: s1, heating a raw material blank to 900-1150 ℃, forging the forging blank on a free forging press, upsetting, drawing and flattening the forging blank into a square blank by using upper and lower flat anvils, and then returning to a furnace for heating and preserving heat; S2, discharging the square blank which is heated and kept in place for continuous forging, firstly, dividing the blank by a cutter, performing square striking on the small end part of the divided blank, chamfering and rounding the square striking part, rounding and drawing the rounded part again to obtain step shafts with different sections, and finally obtaining the special-shaped solid blank A of the large-end flat square small-end step shaft; S3, returning the special-shaped solid blank A to a furnace for heating, wherein the heating temperature is less than or equal to 1100 ℃, and the temperature is kept for a certain time, meanwhile, preheating a forming lower die to 250-350 ℃, smearing a release agent in a grinding tool cavity, then integrally moving the forming lower die to a hydraulic machine working platform which is positioned right below an upper anvil of the hydraulic machine, in addition, clamping the small end of the special-shaped solid blank A by a manipulator, then placing the heated and fully-kept special-shaped solid blank A into the forming lower die, enabling a large end flat side to face downwards, sleeving a small end step shaft into an upper sleeve, uniformly pressing the upper anvil downwards along with the hydraulic machine, transmitting the pressure to the upper sleeve, and forming a large end flat side of the special-shaped solid blank A along with the inner cavity of the forming lower die under the pressure of the upper sleeve to obtain a special-shaped solid blank B; and S4, placing the punch at the center of the hole of the upper sleeve, and punching a blind hole on the small end of the special-shaped solid blank B by using an upper anvil block to obtain the final metal fixed control surface body forging for the aircraft. In the foregoing method for forming the metal control surface body for the aircraft, immediately after the S4 forging is finished, spraying water to the metal control surface body forging, and then performing solid solution aging heat treatment. In the method for forming the metal fixed control surface body for the aircraft, the raw materials are smelted by adopting a vacuum induction furnace, electroslag remelting and vacuum consumable arc remelting, the smelted raw materials are used for de