A method of square corner forming of a forging

Abstract

The present application belongs to the technical field of titanium alloy material preparation, and relates to a method for forming a right angle of a forging. In the present application, a square blank is upset and elongated three times, the height of each upsetting and the size of the elongated square blank are controlled, and the forming of the square blank edges and the right angle is controlled. The upsetting is performed to increase the size of the three adjacent surfaces of the round corner, to produce bulging, and then elongation is performed, the round corner starts to fill, the right angle is gradually filled through three times of upsetting and elongation, the deformation amount gradually decreases in the three times of upsetting, the right angle of the forging can be well formed, and the structure of each part of the forging is more uniform.

Description

Technical Field

[0001] This invention belongs to the field of titanium alloy material preparation technology, specifically a method for right-angle forming of forgings. Background Technology

[0002] During the free forging process of square forgings, improper deformation sequence and deformation amount settings lead to incomplete corner forming, rounded corners instead of right angles, and collapse at the four corners, resulting in dimensional defects. Inappropriate forging methods also cause the blank edges to twist and deform, resulting in non-perpendicularity to the end faces, non-parallelism of the four edges, and parallelogram-shaped end faces. To address the issues of corner collapse and non-perpendicularity of edges and end faces during the forming process of square forgings, a free forging process for right angles is proposed. Summary of the Invention

[0003] The purpose of this invention is to provide a method for forming right-angled forgings, which can improve the problems of corner collapse and non-perpendicularity of edges and end faces that occur during the forging process of square forgings.

[0004] The above-mentioned objective of this invention is achieved through the following technical solution:

[0005] A method for forming right-angled forgings, characterized by comprising the following steps:

[0006] Step 1: Heat the round bar with height H in an electric heating furnace to a heating temperature of Tβ-(10~15)℃ to begin upsetting; rotate it 90 degrees along the axis of the bar billet to begin square forging, forging it into a square billet with a length of 1.3-1.5L and a width of 0.75-0.95B, where L and B are the height and width of the rectangular forging section, respectively.

[0007] Step 2: Rotate the square billet obtained in Step 1 so that its length direction is perpendicular to the anvil. Upset the square billet to a height of 0.85L. Rotate it 90 degrees along the axis of the billet to start making it square, making it into a square billet with a length of 1.1-1.3L and a width of 0.85-0.95B.

[0008] Step 3: Rotate the square billet obtained in Step 2 until its length is perpendicular to the anvil. Upset the square billet to a height of 0.9L. Rotate it 90 degrees along the axis of the billet to begin shaping it into a square billet with a height of L and a width of B.

[0009] In step one, the upsetting is carried out to a height of H / 3-H / 2.

[0010] The upsetting process in steps one through three is completed in 1 to 3 passes.

[0011] In step one, the single hammer pressing amount is 30-100mm.

[0012] In step two, the single hammer pressing amount is 10-70mm.

[0013] In step three, the single hammer press-down amount is 5-20mm.

[0014] The hammer pressing speed in steps one through three is 1-5 mm / s.

[0015] Adding hot materials below the phase change point allows for reheating and heat preservation, which is halved.

[0016] Technical effects of the present invention:

[0017] In this invention, the billet undergoes three upsetting and drawing processes. By controlling the upsetting height and the size of the billet during each drawing process, the forming of the billet's edges and right angles is controlled. Upsetting increases the size of the three adjacent faces of the rounded corners, creating a bulge. During the subsequent drawing process, the rounded corners begin to fill in. Through three upsetting and drawing processes, the right angles are gradually filled in. The deformation during the three upsetting processes gradually decreases, which not only allows for the good forming of right angles in the forging but also ensures that all parts of the forging are fully deformed, resulting in a more uniform microstructure. Detailed Implementation

[0018] To better understand the purpose, technical solution, and advantages of this invention, the following detailed description is provided in conjunction with embodiments.

[0019] This invention relates to a method for forming right-angled forgings. The dimensions of the square billet forging are defined by L and B, representing the height and width of the cross-section of the rectangular forging, respectively. The forming of the rectangular forging includes the following steps:

[0020] Step 1: Heat the round bar with height H in an electric heating furnace to a temperature Tβ-(10~15)℃, and begin upsetting until the height is H / 3-H / 2. Rotate the bar 90 degrees along its axis and begin squarening, with a single hammer reduction of 30-100mm, to form a square billet with a length of 1.3-1.5L and a width of 0.75-0.95B.

[0021] Step 2: Rotate the square billet obtained in Step 1 so that its length direction is perpendicular to the anvil. Upset the square billet to 0.85L. Rotate it 90 degrees along the axis of the billet and start shaping it into a square. Press down 10-70mm with a single hammer to shape it into a square billet with a length of 1.1-1.3L and a width of 0.85-0.95B.

[0022] Step 3: Rotate the square billet obtained in Step 2 until its length is perpendicular to the anvil. Upset the square billet to 0.9L. Rotate it 90 degrees along the axis of the billet and start making it square. The single hammer pressing amount is 5-20mm, and the hammer pressing speed is 1-5mm / s. Make it into a square billet with a height of L and a width of B.

[0023] Example 1:

[0024] This method is used to form right angles in forgings with a length of 400mm, a width of 200mm, and a thickness of 150mm.

[0025] Step 1: Heat a round bar with a diameter of 300mm and a height of 170mm in an electric heating furnace to 800℃ and hold for 4 hours. After removing it from the furnace, begin upsetting it on a press to a height of 80mm. Rotate the bar 90 degrees along its axis and begin squarening, pressing down 50mm with a single hammer to form a square billet with a length of 560mm and a width of 160mm.

[0026] Step 2: Rotate the square billet obtained in Step 1 so that its length direction is perpendicular to the anvil. Upset the square billet to 340mm. Rotate it 90 degrees along the axis of the billet and start shaping it into a square billet. Press down 50mm with a single hammer to shape it into a square billet with a length of 480mm and a width of 180mm.

[0027] Step 3: Rotate the square billet obtained in Step 2 so that its length direction is perpendicular to the anvil. Upset the square billet to 540mm. Rotate it 90 degrees along the axis of the billet and start making it square. The single hammer pressing amount is 20mm, and the hammer pressing speed is 4mm / s. Make it into a square billet with a height of 600mm and a width of 150mm.

[0028] Step 4: Rotate the square billet obtained in Step 3 so that its length direction is perpendicular to the anvil. Upset the square billet to 360mm. Rotate it 90 degrees along the axis of the billet and start making it square. The single hammer pressing amount is 8mm, the hammer pressing speed is 4mm / s, and it is made into a square billet with a height of 400mm, a width of 200mm, and a thickness of 150mm.

[0029] Example 2:

[0030] This method can be used to form right angles in forgings with a length of 600mm, a width of 150mm, and a thickness of 392.5mm.

[0031] Step 1: Heat a round bar with a height of 500mm and a diameter of 300mm in an electric heating furnace to 800℃ and hold for 4 hours. After removing it from the furnace, begin upsetting it on a press to a height of 250mm. Rotate the bar 90 degrees along its axis and begin squarening, pressing down 90mm with a single hammer to form a square billet with a length of 840mm and a width of 115mm.

[0032] Step 2: Rotate the square billet obtained in Step 1 so that its length direction is perpendicular to the anvil. Upset the square billet to 510mm. Rotate it 90 degrees along the axis of the billet and start shaping it into a square. Press down 50mm with a single hammer to shape it into a square billet with a length of 720mm and a width of 135mm.

[0033] Step 3: Rotate the square billet obtained in Step 2 so that its length direction is perpendicular to the anvil. Upset the square billet to 540mm. Rotate it 90 degrees along the axis of the billet and start making it square. The single hammer pressing amount is 20mm, and the hammer pressing speed is 4mm / s. Make it into a square billet with a height of 600mm and a width of 150mm.

[0034] Step 4: Rotate the square billet obtained in Step 3 so that its length direction is perpendicular to the anvil. Upset the square billet to 540mm. Rotate it 90 degrees along the axis of the billet and start squarening. The single hammer pressing amount is 10mm, the hammer pressing speed is 5mm / s, and the billet is 600mm high, 150mm wide, and 392.5mm thick.

Claims

1. A method for forming right-angled forgings, characterized in that, Includes the following steps: Step 1: Heat the round bar with height H in an electric heating furnace to a heating temperature of Tβ-(10~15)℃ to begin upsetting; rotate it 90 degrees along the axis of the bar billet to begin square forging, forging it into a square billet with a length of 1.3-1.5L and a width of 0.75-0.95B, where L and B are the height and width of the rectangular forging section, respectively. Step 2: Rotate the square billet obtained in Step 1 so that its length direction is perpendicular to the anvil. Upset the square billet to a height of 0.85L. Rotate it 90 degrees along the axis of the billet to start making it square, making it into a square billet with a length of 1.1-1.3L and a width of 0.85-0.95B. Step 3: Rotate the square billet obtained in Step 2 until its length is perpendicular to the anvil. Upset the square billet to a height of 0.9L. Rotate it 90 degrees along the axis of the billet to begin shaping it into a square billet with a height of L and a width of B.

2. The method for forming right-angled forgings according to claim 1, characterized in that, The upsetting process described in step one is to a height of H / 3-H / 2.

3. The method for forming right-angled forgings according to claim 1, characterized in that, Steps one through three, including upsetting, are completed in 1 to 3 passes.

4. The method for forming right-angled forgings according to claim 1, characterized in that, Step 1: Single hammer press down 30-100mm.

5. The method for forming right-angled forgings according to claim 1, characterized in that, Step 2: Single hammer press down 10-70mm.

6. The method for forming right-angled forgings according to claim 1, characterized in that, Step 3: Single hammer press down 5-20mm.

7. The method for forming right-angled forgings according to claim 1, characterized in that, The hammer pressing speed in steps one through three is 1-5 mm / s.

8. The method for forming right-angled forgings according to claim 1, characterized in that, Adding hot materials below the phase change point allows for reheating and holding in the furnace, but the reheating and holding time is halved.