Closed punching method for high-cylinder ring piece

Abstract

The invention discloses a closed punching method for a high cylindrical ring piece, which comprises the following steps: firstly, designing a punching die, arranging a dovetail groove for fixing on the outer wall of the punching die, arranging a limiting cushion plate for adjusting the position of a blank in the punching die, and punching the blank in the punching die; meanwhile, a leakage disc is designed, the outer wall of the leakage disc is also provided with a dovetail groove used for fixing, the upper end of the leakage disc is provided with a limiting hole, the blank is just placed in the limiting hole, the blank is punched open in the leakage disc, and punching of the high cylinder ring piece is achieved. According to the method, the defects of blank end face pulling, deformation and the like can be prevented, and the blank consistency is improved. The method is used for closed punching of the high-cylinder ring piece.

Description

Technical Field

[0001] The present invention relates to a punching method, in particular to a closed die punching method for high cylinder rings. Background Art

[0002] High cylinder rings are rotating parts commonly used in fields such as aerospace. The ratio of the height to the wall thickness of this forging is relatively large, and it is usually formed by rolling. Rolling generally refers to radial rolling, that is, a process of reducing the wall thickness and increasing the inner and outer diameters, with very little change in height; even the most advanced current radial-axial double-sided ring rolling technology can only reduce the height through tapered rollers and cannot well control the height growth. Therefore, when preparing the blank, the height of the blank is usually designed to be equal to or slightly greater than the height of the ring. Then, for high cylinder rings, defects such as end face material drawing and deformation are likely to occur during punching, affecting the quality of the forging. Currently, there is no good control method. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method of closed die punching. By designing a closed die punching mold, punching is performed on the high cylinder ring in the mold to ensure that defects such as end face material drawing and deformation do not occur during punching, and the quality of the forging is improved.

[0004] To solve the above technical problem, the closed die punching method for high cylinder rings of the present invention includes the following steps:

[0005] Cut the material into bars according to a certain specification; heat the bars to 650 ± 10 °C, hold for (0.4 - 0.5) min / mm, then raise the temperature to 1040 ± 10 °C, hold for (0.4 - 0.5) min / mm, and the furnace loading temperature ≤ 650 °C; after being thoroughly heated, place the bars on a press, drive the forging hammer to upset the bars to a predetermined size; put the upset blank into the punching die, and place them together under the press. The outer wall of the punching die has a dovetail groove for fixing to prevent the punching die and the blank from moving with the forging hammer. A limiting cushion plate is placed inside the punching die, and this cushion plate is designed according to the height of the blank to make the blank flush with the upper end of the punching die, ensuring that the forging hammer will not collide with the punching die during punching; place a suitable punch at the center on the blank, drive the forging hammer to press down the punch, press the punch into the blank, and then take it out; the driving force of the forging hammer wherein, σ S$\sigma$ is the true flow stress at the corresponding deformation temperature and speed, $\mu$ is the friction factor, $S$ is the contact area between the blank and the punch, and $H$ is the depth that the punch presses into the blank; Take out the blank and place it on the leakage tray. There are also dovetail grooves for fixation on the outer wall of the leakage tray. There is a limit hole at the upper end of the leakage tray, and the size of the limit hole is the same as the outer diameter of the blank. The blank is just placed in the limit hole; Invert the punch and place it on the inner hole of the blank, drive the forging hammer to press down the punch, and press the punch into the blank; Lift the forging hammer, place a cushion block on the punch, and then drive the forging hammer to press down the cushion block to punch open the blank. The cushion block, punch, and punching core material leak out from the leakage tray together to complete the punching of the high cylinder ring part.

[0006] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0007] In the closed punching method of the high cylinder ring part of the present invention, by designing the punching die, defects such as blank end face material drawing and deformation are prevented. Moreover, the blank does not need to be rolled and shaped, reducing the operation steps and the operation difficulty, and improving the production efficiency. The blank deforms in the die, improving its appearance quality, and also improving the dimensional accuracy and batch stability of the blank. The limit hole of the leakage tray can also prevent mistakes such as punching deviation during punching, improving the consistency of the blank. Brief Description of the Drawings

[0008] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0009] Figure 1 It is a schematic structural diagram of the punching die.

[0010] Figure 2 It is a schematic structural diagram of the cushion tray.

[0011] Figure 3 It is a schematic diagram of the process of the punch pressing into the blank.

[0012] Figure 4 It is a schematic diagram of the process of the inverted punch pressing into the blank.

[0013] Figure 5 It is a schematic diagram of the process of punching open the blank with a cushion block. Specific Embodiments

[0014] To implement the closed punching method of the high cylinder ring part of the present invention, equipment such as a forging heating furnace, a press, and a manipulator need to be provided. Taking the GH907 alloy high cylinder ring part as an example, its specific implementation method:

[0015] The main chemical element contents (by weight percentage) of this GH907 alloy are as follows: C content ≤ 0.12%, Ni content 35.0% - 40.0%, Co content 12.0% - 16.0%, Ti content 1.30% - 1.80%, (Nb + Ta) content 4.30% - 5.20%, Si content 0.07% - 0.35%, Cr content ≤ 1.00%, Al content ≤ 0.20%, B content ≤ 0.012%, Mn content ≤ 1.00%, Cu content ≤ 0.50%, S content ≤ 0.015%, P content ≤ 0.015%, and the balance is Fe.

[0016] The steps of this method are as follows:

[0017] Cut the GH907 alloy into bars according to certain specifications; heat the GH907 alloy bars to 650 ± 10 °C, hold for (0.4 - 0.5) min / mm, then raise the temperature to 1040 ± 10 °C, hold for (0.4 - 0.5) min / mm, and the furnace loading temperature ≤ 650 °C; after being heated through, place the GH907 alloy bars on a press, drive the forging hammer to upset the GH907 alloy bars to a predetermined size; put the upset GH907 alloy blank 4 into the punching die 1, and place them together under the press. The outer wall of the punching die 1 has a dovetail groove for fixing to prevent the punching die 1 and the GH907 alloy blank 4 from moving with the forging hammer. As Figure 1 shown, a limiting cushion plate 2 is placed inside the punching die 1. This cushion plate 2 is designed according to the height of the GH907 alloy blank 4 to make the GH907 alloy blank 4 flush with the upper end of the punching die 1, ensuring that the forging hammer will not collide with the punching die 1 during punching; place a suitable punch 3 at the center on top of the GH907 alloy blank 4, drive the forging hammer to press down the punch 3, press the punch 3 into the GH907 alloy blank 4, and then take it out. The driving force of the forging hammer wherein, σ S is the true flow stress at the corresponding deformation temperature and speed, μ is the friction coefficient, S is the contact area between the blank and the punch, and H is the depth of the punch pressed into the blank; take out the GH907 alloy blank 4 and place it on the drain pan 5. The outer wall of the drain pan 5 also has a dovetail groove for fixing. The upper limiting hole of the drain pan 5 has a size consistent with the outer diameter of the GH907 alloy blank 4, and the GH907 alloy blank 4 is exactly placed in the limiting hole; place the punch 3 upside down on the inner hole of the GH907 alloy blank 4, drive the forging hammer to press down the punch 3, and press the punch 3 into the GH907 alloy blank 4; lift the forging hammer, place a cushion block 6 on top of the punch 3, and then drive the forging hammer to press down the cushion block 6 to punch open the GH907 alloy blank 4. The cushion block 6, the punch 3 and the punching core material leak out from the drain pan 5 together to complete the punching of the GH907 alloy ring.

Claims

1. A closed punching method for a high cylinder ring part, characterized in that, It includes the following steps: Cut the material into bars according to certain specifications; heat the bars to 650 ± 10 °C, hold for (0.4 - 0.5) min / mm, then raise the temperature to 1040 ± 10 °C, hold for (0.4 - 0.5) min / mm, and the furnace charging temperature ≤ 650 °C; after being thoroughly heated, place the bars on a press, drive the forging hammer to upset the bars to the predetermined size; put the upset blank into a punching die, and place them together under the press. The outer wall of the punching die has a dovetail groove for fixing to prevent the punching die and the blank from moving with the forging hammer. A limiting cushion plate is placed inside the punching die. The cushion plate is designed according to the height of the blank to make the blank flush with the upper end of the punching die, ensuring that the forging hammer will not collide with the punching die during punching; place a suitable punch at the center on the blank, drive the forging hammer to press down the punch, press the punch into the blank, and then take it out; the driving force of the forging hammer wherein, σ S is the true flow stress at the corresponding deformation temperature and speed, μ is the friction factor, S is the contact area between the blank and the punch, and H is the depth of the punch pressed into the blank; take out the blank and place it on a drain pan. The outer wall of the drain pan also has a dovetail groove for fixing. There is a limiting hole at the upper end of the drain pan, and the size of the limiting hole is the same as the outer diameter of the blank. The blank is just placed in the limiting hole; invert the punch and place it on the inner hole of the blank, drive the forging hammer to press down the punch, and press the punch into the blank; lift the forging hammer, place a cushion block on the punch, then drive the forging hammer to press down the cushion block to punch open the blank, and the cushion block, punch and punching core material leak out from the drain pan together to complete the punching of the high cylinder ring part.

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