Multi-directional rolling method for rectangular ring piece

Abstract

The invention discloses a multi-directional rolling method of a rectangular ring piece, which comprises the following steps of: firstly, heating a high-temperature alloy bar to a forging temperature, and upsetting, punching and pre-rolling to prepare a rectangular ring blank; and then the rectangular ring blank is installed on a ring rolling machine, a conical roller is lifted by h = 5-10 mm, the rectangular ring blank is inclined, then rolling forming is conducted, and the rectangular ring piece is obtained. According to the method, the mechanical properties of the rectangular ring piece in all directions are kept consistent by changing the flowing direction of the material during rolling, so that the comprehensive mechanical properties of the rectangular ring piece are improved. The method is used for multi-directional rolling of the rectangular ring piece.

Description

Technical Field

[0001] The present invention relates to a rolling method, and particularly to a multi-directional rolling method for rectangular ring parts. Background Art

[0002] Ring rolling is one of the most effective means for producing high-performance seamless ring parts at present, and is widely used in many fields such as aviation and aerospace. For the production of rectangular ring parts, radial rolling is mostly used. The ring part and the blank are designed with the same height. The tapered roller only plays a role in preventing the ring part from climbing and restricting the increase in the height of the ring part. The axial deformation amount is small, resulting in a large difference between the radial mechanical properties and the axial mechanical properties of the ring part. With the development and progress of ring rolling technology, people have gradually mastered the radial / axial two-way rolling forming method. For the rectangular ring parts produced by this method, their axial mechanical properties have been greatly improved. However, it is still impossible to ensure that the mechanical properties of the ring part in all directions are consistent. The reason is that both the radial feed and the axial feed will cause the metal material to flow in the tangential direction of the ring part, forming a forging streamline in the tangential direction, so that the mechanical properties in the tangential direction are much better than those in the radial and axial directions. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a multi-directional rolling method for rectangular ring parts, which can make the mechanical properties of each direction of the rectangular ring part consistent by changing the flow direction of the material during rolling, so as to improve the comprehensive mechanical properties of the rectangular ring part.

[0004] To solve the above technical problem, the technical solution of the multi-directional rolling method for rectangular ring parts of the present invention includes the following steps:

[0005] Heat the superalloy bar cut according to specifications to the forging temperature, and after upsetting, punching, and pre-rolling, make a rectangular ring blank with a height of H1, a thickness of B1, and an outer diameter of R1;

[0006] Load the rectangular ring blank onto the ring rolling mill. The core roll passes through the middle of the rectangular ring blank. Drive the core roll and drive the rectangular ring blank closer to the main roll. Then drive the conical rolls closer to the other side of the rectangular ring blank. The upper and lower conical rolls clamp the rectangular ring blank in the middle. When the rectangular ring blank is laid flat, drive the conical rolls to lift by h = 5 mm to 10 mm to make the rectangular ring blank tilt. Start the ring rolling mill for rolling. Adjust the rotational speed of the main roll to r = 1.0 rad / s. Feed the core roll radially at a feed rate of v1 = 2.5 mm / s with a driving force of F1 = 390 KN to 423 KN. The total radial feed amount is S1 = B1 - B2 + (H1×h) / 2R1. Feed the conical rolls axially at a feed rate of v2 = 1.5 mm / s with a driving force of F2 = 325 KN to 358 KN. The total axial feed amount is S2 = H1 - H2 + (B1×h) / 2R1. In the formula, B1 is the thickness of the rectangular ring blank, B2 is the thickness of the rectangular ring part, H1 is the height of the rectangular ring blank, H2 is the height of the rectangular ring part, and R1 is the outer diameter of the rectangular ring blank. When the rolling process enters a stable state, gradually lower the conical rolls until they are flush with the workbench. Stop feeding when both the radial feed amount and the axial feed amount reach the target. The rectangular ring part rotates under the action of the ring rolling mill and stops after a period of time. Then take out the rectangular ring part.

[0007] The relationship between the radial feed speed and the axial feed speed is as follows:

[0008] S1 / v1 = S2 / v2

[0009] In the formula, S1 is the total radial feed amount;

[0010] S2 is the total axial feed amount;

[0011] v1 is the radial feed speed;

[0012] v2 is the axial feed speed.

[0013] The driving force F1 for radial feed satisfies the following relationship:

[0014] F1 = α×n0×σ×H×L1

[0015] In the formula, F1 is the driving force for radial feed;

[0016] α is the pressure increase coefficient caused by the width expansion of the rectangular ring part, taking 2.0 to 2.4;

[0017] n0 is the real-time stress state coefficient;

[0018] σ is the flow stress of the material;

[0019] H is the real-time height of the rectangular ring blank;

[0020] L1 is the real-time arc length of contact between the core roll and the rectangular ring blank.

[0021] The driving force F2 for axial feed satisfies the following relationship:

[0022] F2 = β × n0 × σ × B × L2

[0023] In the formula, F2 is the driving force for axial feed;

[0024] β is the pressure increase coefficient caused by the decrease in the height of the rectangular ring part, taking a value of 2.8 - 3.2;

[0025] n0 is the real-time stress state coefficient;

[0026] σ is the flow stress of the material;

[0027] B is the real-time thickness of the rectangular ring blank;

[0028] L2 is the real-time arc length of contact between the tapered roll and the rectangular ring blank.

[0029] The superalloy is GH4169 alloy.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] In the multi-directional rolling method of the rectangular ring part of the present invention, by lifting the tapered roll by h = 5 mm - 10 mm, a small inclination of the rectangular ring part occurs, changing the flow of the metal material during rolling and making it consistent in all directions.

[0032] The rotational speed of the main roll is set to 1.0 rad / s, the radial feed speed is 2.5 mm / s, the axial feed speed is 1.5 mm / s, and the radial feed speed and the axial feed speed satisfy the relational expression S1 / v1 = S2 / v2, in order to ensure that the material flow speed in the tangential direction is consistent with the material flow speeds in the radial and axial directions.

[0033] The total amount of radial feed is S1 = B1 - B2 + (H1 × h) / 2R1 and the total amount of axial feed is S2 = H1 - H2 + (B1 × h) / 2R1. On the one hand, it makes the rectangular ring blank undergo sufficient plastic deformation and improves the mechanical properties; on the other hand, it is to compensate for the dimensional differences caused by the elevation of the tapered roll.

[0034] The driving force F1 for radial feed satisfies the relational expression F1 = α × n0 × σ × H × L1, and the driving force F2 for axial feed satisfies the relational expression F2 = β × n0 × σ × B × L2, making the rectangular ring blank undergo plastic deformation in the radial and axial directions and preventing the up-and-down crosstalk caused by the inclination of the ring blank. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0036] Figure 1 It is a schematic diagram of the multi-directional rolling method of the rectangular ring part described in the present invention. Specific embodiments

[0037] To implement the multi-directional rolling method of the rectangular ring part described in the present invention, equipment such as a forging heating furnace, a press, a manipulator, and a ring rolling mill need to be provided. Taking the superalloy with the Chinese material grade GH4169 as an example, the specific embodiments of this method are described in detail below:

[0038] The main chemical element contents (weight percentages) of this alloy are as follows: C content ≤ 0.08%, Cr content 17.0% - 21.0%, Ni content 50.0% - 55.0%, Co content ≤ 1.0%, Mo content 2.80% - 3.30%, Al content 0.30% - 0.70%, Ti content 0.75% - 1.15%, Nb content 4.75% - 5.50%, B content ≤ 0.006%, Mg content ≤ 0.01%, Mn content ≤ 0.35%, Si content ≤ 0.35%, P content ≤ 0.015%, S content ≤ 0.015%, Cu content ≤ 0.30%, Ca content ≤ 0.01%, Pb content ≤ 0.0005%, Se content ≤ 0.0003%, and the balance is Fe.

[0039] The steps of this method are as follows:

[0040] Heat the GH4169 alloy bar cut according to specifications to the forging temperature, and after upsetting, punching, and pre-rolling, make a rectangular ring blank with a height of H1, a thickness of B1, and an outer diameter of R1;

[0041] Such as Figure 1As shown, load the rectangular ring blank 1 onto the ring rolling mill. The core roll 3 passes through the middle of the rectangular ring blank 1. Drive the core roll 3 and drive the rectangular ring blank 1 closer to the main roll 2. Then drive the tapered rolls 4 closer to the other side of the rectangular ring blank 1. The upper and lower tapered rolls 4 clamp the rectangular ring blank 1 in the middle. When the rectangular ring blank 1 is laid flat, drive the tapered rolls 4 to lift by h = 5 mm to 10 mm, causing the rectangular ring blank 1 to tilt. Start the ring rolling mill for rolling. Adjust the rotational speed of the main roll 2 to r = 1.0 rad / s. Feed the core roll 3 radially at a feed rate of v1 = 2.5 mm / s with a driving force of F1 = 390 KN to 423 KN. The total radial feed amount S1 = B1 - B2 + (H1×h) / 2R1. Feed the tapered rolls 4 axially at a feed rate of v2 = 1.5 mm / s with a driving force of F2 = 325 KN to 358 KN. The total axial feed amount S2 = H1 - H2 + (B1×h) / 2R1. In the formula, B1 is the thickness of the rectangular ring blank, B2 is the thickness of the rectangular ring part, H1 is the height of the rectangular ring blank, H2 is the height of the rectangular ring part, and R1 is the outer diameter of the rectangular ring blank. When the rolling process enters a stable state, gradually lower the tapered rolls 4 until they are flush with the workbench 5. Stop feeding when both the radial feed amount and the axial feed amount reach the target. The rectangular ring part rotates under the action of the ring rolling mill and stops after a period of time. Then take out the rectangular ring part.

[0042] The relationship between the radial feed speed and the axial feed speed is as follows:

[0043] S1 / v1 = S2 / v2

[0044] In the formula, S1 is the total radial feed amount;

[0045] S2 is the total axial feed amount;

[0046] v1 is the radial feed speed;

[0047] v2 is the axial feed speed.

[0048] The driving force F1 for the radial feed satisfies the following relationship:

[0049] F1 = α×n0×σ×H×L1

[0050] In the formula, F1 is the driving force for the radial feed;

[0051] α is the pressure increase coefficient caused by the broadening of the rectangular ring part, taking 2.2 to 2.4;

[0052] n0 is the real-time stress state coefficient;

[0053] σ is the flow stress of the material;

[0054] H is the real-time height of the rectangular ring blank;

[0055] L1 is the real-time arc length of contact between the core roll and the rectangular ring blank.

[0056] The driving force F2 for the axial feed satisfies the following relationship:

[0057] F2 = β × n0 × σ × B × L2

[0058] In the formula, F2 is the driving force for the axial feed;

[0059] β is the pressure increase coefficient caused by the reduction in the height of the rectangular ring part, taking values from 2.8 to 3.2;

[0060] n0 is the real-time stress state coefficient;

[0061] σ is the flow stress of the material;

[0062] B is the real-time thickness of the rectangular ring blank;

[0063] L2 is the real-time arc length of contact between the tapered roll and the rectangular ring blank.

Claims

1. A multi-directional rolling method for a rectangular ring workpiece, characterized in that It includes the following steps: Heat the superalloy bar cut to specifications to the forging temperature, and after upsetting, punching, and pre-rolling, make a rectangular ring blank with a height of H1, a thickness of B1, and an outer diameter of R1; Load the rectangular ring blank onto the ring rolling mill. The core roll passes through the middle of the rectangular ring blank. Drive the core roll and drive the rectangular ring blank closer to the main roll, and then drive the conical rolls closer to the other side of the rectangular ring blank. The upper and lower conical rolls clamp the rectangular ring blank in the middle; when the rectangular ring blank is laid flat, drive the conical rolls to lift by h = 5 mm to 10 mm to make the rectangular ring blank tilt; Start the ring rolling mill for rolling. Adjust the rotational speed of the main roll r = 1.0 rad / s, and make the core roll feed radially at a feed speed of v1 = 2.5 mm / s with a driving force F1 = 390 KN to 423 KN. The total radial feed amount S1 = B1 - B2 + (H1×h) / 2R1. Make the conical rolls feed axially at a feed speed of v2 = 1.5 mm / s with a driving force F2 = 325 KN to 358 KN. The total axial feed amount S2 = H1 - H2 + (B1×h) / 2R1. In the formula, B1 is the thickness of the rectangular ring blank, B2 is the thickness of the rectangular ring part, H1 is the height of the rectangular ring blank, H2 is the height of the rectangular ring part, and R1 is the outer diameter of the rectangular ring blank; when the rolling process enters a stable state, gradually lower the conical rolls until they are flush with the workbench; when both the radial feed amount and the axial feed amount reach the target, stop the feed. The rectangular ring part rotates under the action of the ring rolling mill and stops after a period of time. Take out the rectangular ring part.

2. The multi-directional rolling method of the rectangular ring part according to claim 1, characterized in that The superalloy is GH4169 alloy.

3. The multi-directional rolling method of the rectangular ring part according to claim 1 or 2, characterized in that The relationship between the radial feed speed and the axial feed speed is as follows: S1 / v1 = S2 / v2 In the formula, S1 is the total radial feed amount; S2 is the total axial feed amount; v1 is the radial feed speed; v2 is the radial feed speed.

4. The multi-directional rolling method of the rectangular ring part according to claim 1 or 2, characterized in that, The driving force F1 for radial feed satisfies the following relationship: F1 = α×n0×σ×H×L1 In the formula, F1 is the driving force for radial feed; α is the pressure increase coefficient caused by the broadening of the rectangular ring part, taking 2.0 to 2.4; n0 is the real-time stress state coefficient; σ is the flow stress of the material; H is the real-time height of the rectangular ring blank; L1 is the real-time arc length of contact between the core roll and the rectangular ring blank.

5. The multi-directional rolling method of the rectangular ring part according to claim 1 or 2, characterized in that, The driving force F2 for axial feed satisfies the following relationship: F2 = β×n0×σ×B×L2 In the formula, F2 is the driving force for axial feed; β is the pressure increase coefficient caused by the reduction of the height of the rectangular ring part, taking 2.8 to 3.2; n0 is the real-time stress state coefficient; σ is the flow stress of the material; B is the real-time thickness of the rectangular ring blank; L2 is the real-time arc length of contact between the conical roll and the rectangular ring blank.

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