A thermomechanical treatment device and its process method

Abstract

The present invention discloses a thermomechanical treatment device and its process method, including a machine body, a frame body and a top seat. The top seat is connected above the machine body through the frame body. A processing position is arranged on the upper surface of the machine body. A steel strip is placed at the processing position. The steel strip is introduced into the processing position by a steel strip guide wheel. Symmetrically arranged on both sides of the processing position and capable of lifting are upper pressing devices for the steel strip. The upper pressing devices for the steel strip can press and clamp both ends of the steel strip. On one side of the processing position, there is a weld protection device that can be buckled on the steel strip and a lower backing plate that can be moved under the steel strip. Below the processing position, there is a lower heating intermediate frequency probe, and above it, there is a rolling head that can be moved up and down. The present invention can make the hardness of the weld and the heat-affected zone closer, eliminate the residual stress of the weld, and make the hardness and structure closer to or slightly higher than those of the base material, thereby ensuring the fatigue life and tensile strength of the coiled tubing.

Description

Technical Field

[0001] The present invention relates to the technical field of material heat treatment, and particularly relates to a thermomechanical treatment device and its process method. Background Art

[0002] When welding the plates of coiled tubing, there is a heat-affected zone during welding. The grains in the position of the heat-affected zone are coarse, the hardness is soft, the strength of the weld position is high, and there is a large hardness contrast between the heat-affected zone and the weld. When welding into coiled tubing, fractures or grooves are likely to occur at this position, seriously affecting the fatigue life and tensile strength of the coiled tubing. Summary of the Invention

[0003] The purpose of the present invention is to provide a thermomechanical treatment device and its process method to solve the above problems existing in the prior art.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A thermomechanical treatment device of the present invention includes a machine body, a frame body, and a top seat. The top seat is connected above the machine body through the frame body. A processing position is arranged on the upper surface of the machine body. A steel strip is placed at the processing position. The steel strip is introduced into the processing position by a steel strip guide wheel. Symmetrically arranged on both sides of the processing position and capable of lifting are upper pressing devices for the steel strip. The upper pressing devices for the steel strip can press and clamp both ends of the steel strip. On one side of the processing position, there is a weld protection device that can be buckled on the steel strip and a lower backing plate that can move to the lower part of the steel strip. Below the processing position, there is a lower heating intermediate frequency probe, and above it, there is a rolling head that can move up and down.

[0006] Further, there are two steel strip guide wheels, which are respectively used for introducing and exporting the steel strip. The bottom of the steel strip guide wheel is connected with a telescopic cylinder, and the telescopic rod is connected with the machine body.

[0007] Further, an infrared temperature measurement probe is arranged inside the frame body, and there is a gap on the weld protection device for the infrared temperature measurement probe to measure temperature.

[0008] Further, the top seat is slidably connected with an oil cylinder. The bottom of the oil cylinder is connected with the rolling head. On one side of the rolling head, there is a driving cylinder that can drive the rolling head to move horizontally.

[0009] Still further, the weld protection device is internally filled with a protective gas, and the protective gas is argon.

[0010] Further, the weld protection device is rotatably buckled on the steel strip, and the lower backing plate horizontally rotates and moves to the lower part of the steel strip.

[0011] A thermomechanical treatment process method includes the following steps:

[0012] Step 1: Align the laser on the top seat with the weld of the steel strip and the lower heating intermediate frequency probe.

[0013] Step 2: The pressing device on the steel strip presses down on both ends of the steel strip to prevent the steel strip from moving.

[0014] Step 3: Rotate and buckle the weld protection device onto the weld, and heat it. The heating temperature is 700°C - 800°C, and keep it warm for 8s - 15s.

[0015] Step 4: Rotate the weld protection device away from the weld, lift the pressing device on the steel strip and the steel strip, move the lower backing plate under the steel strip, then put down the steel strip. The pressing device on the steel strip fixes the steel strip downward. The driving cylinder drives the rolling wheel of the rolling head to move back and forth, and then the oil cylinder drives the rolling head to press downward. The rolling pressure is 6t, and the rolling is reciprocated twice. Then the rolling head retracts.

[0016] Step 5: Lift the pressing device on the steel strip and the steel strip, remove the lower backing plate, put down the steel strip. The pressing device on the steel strip fixes the steel strip downward. Rotate and buckle the weld protection device onto the weld again. The secondary heat treatment temperature is 700°C - 800°C, and keep it warm for 8s - 15s.

[0017] Further, in the said Step 4, there is a gap on the weld protection device for the infrared temperature measurement probe to measure the temperature.

[0018] Further, in the said Step 3, rotate and buckle the weld protection device onto the weld, and heat it. The heating temperature is 735°C, and keep it warm for 10s.

[0019] Further, in the said Step 5, the secondary heat treatment temperature is 735°C, and keep it warm for 10s.

[0020] Compared with the prior art, the beneficial technical effects of the present invention:

[0021] The thermomechanical treatment equipment and its process method of the present invention perform heat treatment on the welding position through medium frequency, reduce the hardness of the weld seam, make the hardness of the weld seam and the heat-affected zone closer, and then improve the structural arrangement of the tissue by means of rolling deformation, reduce the tissue spacing, and increase the hardness of the weld seam and the heat-affected zone. Then, through heat treatment again, the residual stress of the weld seam is eliminated, so that the hardness and tissue are closer to or slightly higher than those of the base material, enabling the pipe to avoid the heat-affected zone during use or making the tissue and hardness of the welding position consistent with those of the base material. Among them, heat treatment of the welding position through medium frequency is faster, and the heat treatment and rolling operations use the same equipment. After heat treatment, thermomechanical treatment can be carried out quickly. After thermomechanical treatment, heat treatment is carried out again. The operation is simple, the process control is visual, and the rolling pressure, heat treatment temperature, holding time, etc. can be controlled. At the same time, a weld protection device is configured, which can effectively protect the weld seam and the heat-affected zone during heat treatment and prevent oxidation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below in conjunction with the drawings.

[0023] Figure 1 It is a three-dimensional structural schematic diagram of one side of the thermomechanical treatment equipment according to Embodiment 1 of the present invention;

[0024] Figure 2 It is a three-dimensional structural schematic diagram of the other side of the thermomechanical treatment equipment according to Embodiment 1 of the present invention.

[0025] Description of reference numerals: 1, body; 2, frame; 3, top seat; 4, processing position; 5, steel strip; 6, steel strip guide wheel; 7, steel strip pressing device; 8, weld protection device; 9, infrared temperature measuring probe; 10, oil cylinder; 11, rolling head; 12, lower backing plate; 13, lower heating medium frequency probe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Embodiment 1

[0027] As Figure 1 , Figure 2 shown, a thermomechanical treatment equipment includes a body 1, a frame 2 and a top seat 3. The top seat 3 is connected above the body 1 through the frame 2. A processing position 4 is arranged on the upper surface of the body 1. A steel strip 5 is placed at the processing position 4. The steel strip 5 is introduced into the processing position 4 by a steel strip guide wheel 6. Steel strip pressing devices 7 are symmetrically arranged on both sides of the processing position 4 and can be lifted and lowered. The steel strip pressing devices 7 can press and clamp both ends of the steel strip 5. A weld protection device 8 that can be buckled on the steel strip 5 and a lower backing plate 12 that can move to the lower part of the steel strip 5 are arranged on one side of the processing position 4. A lower heating medium frequency probe 13 is arranged below the processing position 4, and a rolling head 11 that can move up and down is arranged above.

[0028] The thermomechanical treatment equipment of Embodiment 1 performs heat treatment on the welding position through medium frequency, with a faster speed. Moreover, the heat treatment and rolling operations use the same equipment, enabling rapid thermomechanical treatment after heat treatment. After thermomechanical treatment, heat treatment is carried out again. The operation is simple, the process control is visual, and it can control the rolling pressure, heat treatment temperature, holding time, etc. At the same time, the configured weld protection device 8 can effectively protect the weld and the heat induction area during heat treatment to prevent oxidation.

[0029] Specifically, two steel belt guide wheels 6 are provided and are respectively used for guiding in and guiding out the steel belt 5. The bottom of the steel belt guide wheel 6 is connected with a telescopic cylinder, and the telescopic rod is connected with the machine body 1.

[0030] In Embodiment 1, by setting the telescopic cylinder, the telescopic cylinder can drive the steel belt guide wheel 6 to move up and down, and the up and down movement of the steel belt guide wheel 6 can drive the steel belt 5 to be lifted and lowered, so as to move in or out the lower backing plate 12.

[0031] Specifically, an infrared temperature measurement probe 9 is arranged inside the frame body 2, and there is a gap on the weld protection device 8 for the infrared temperature measurement probe 9 to measure temperature.

[0032] In Embodiment 1, by providing a gap on the weld protection device 8 and correspondingly arranging an infrared temperature measurement probe 9 inside the frame body 2, the heating temperature can be monitored in real time through the infrared temperature measurement probe 9.

[0033] Specifically, the top seat 3 is slidably connected with an oil cylinder 10. The bottom of the oil cylinder 10 is connected with the rolling head 11, and a driving cylinder for driving the rolling head 11 to move horizontally is arranged on one side of the rolling head 11.

[0034] In Embodiment 1, by setting the driving cylinder and the oil cylinder 10, the driving cylinder can drive the oil cylinder 10 and the rolling head 11 to slide along the top seat 3 to realize the horizontal movement of the rolling head 11. After the rolling head 11 is in place, the oil cylinder 10 is used to drive the rolling head 11 to move up and down, so as to perform reciprocating rolling operations.

[0035] Among them, the sliding connection between the oil cylinder 10 and the top seat 3 can adopt the connection method of a guide rail and a slider.

[0036] Specifically, a protective gas is passed through the weld protection device 8, and the protective gas is argon.

[0037] Specifically, the weld protection device 8 is rotationally buckled on the steel belt 5, and the lower backing plate 12 rotates horizontally and moves to the lower part of the steel belt 5.

[0038] When the thermomechanical treatment equipment of Embodiment 1 is in use, the laser on the top seat 3 aligns with the weld seam of the steel strip 5 and the lower heating intermediate frequency probe 13. Then, the pressing device 7 on the steel strip presses down and clamps both ends of the steel strip 5 to prevent the steel strip 5 from moving. The weld protection device 8 is rotated and buckled onto the weld seam. There is a gap on the weld protection device 8 for the infrared temperature measurement probe 9 to measure the temperature. Then heating is carried out. After the heating is completed, the weld protection device 8 is rotated away from the weld seam. The pressing device 7 on the steel strip rises and lifts the steel strip 5. At this time, the lower backing plate 12 is rotated horizontally and moved into the lower part of the steel strip 5. Then the telescopic cylinder drives the steel strip 5 to be lowered, and the pressing device 7 on the steel strip presses down to fix the steel strip 5. The driving cylinder drives the rolling wheel of the rolling head 11 to move back and forth, and then the oil cylinder 10 drives the rolling head 11 to press down for rolling. The rolling is repeated twice. Then the rolling head 11 retracts, the pressing device 7 on the steel strip and the steel strip 5 are lifted, the lower backing plate 12 is rotated out of the lower part of the steel strip 5, the telescopic cylinder drives the steel strip 5 to be lowered, the pressing device 7 on the steel strip presses down to fix the steel strip 5, and the weld protection device 8 is rotated and buckled onto the weld seam again for secondary heat treatment.

[0039] Among them, the pressing device 7 on the steel strip is connected to the machine body 1 in a liftable manner and is located on both sides of the processing position 4; the weld protection device 8 is rotatably connected to the machine body 1 and is in a vertical state in the non-working state. It rotates 90° and buckles onto the weld seam during work; the lower backing plate 12 is horizontally rotatably connected to the machine body 1.

[0040] Embodiment 2

[0041] A thermomechanical treatment process method includes the following steps:

[0042] Step 1, the laser on the top seat 3 aligns with the weld seam of the steel strip 5 and the lower heating intermediate frequency probe 13;

[0043] Step 2, the pressing device 7 on the steel strip presses down and clamps both ends of the steel strip 5 to prevent the steel strip 5 from moving;

[0044] Step 3, the weld protection device 8 is rotated and buckled onto the weld seam for heating. The heating temperature is 700°C - 800°C, and the heat preservation time is 8s - 15s;

[0045] Step 4, the weld protection device 8 is rotated away from the weld seam, the pressing device 7 on the steel strip and the steel strip 5 are lifted, the lower backing plate 12 is moved into the lower part of the steel strip 5, then the steel strip 5 is lowered, the pressing device 7 on the steel strip presses down to fix the steel strip 5, the driving cylinder drives the rolling wheel of the rolling head 11 to move back and forth, and then the oil cylinder 10 drives the rolling head 11 to press down for rolling. The rolling pressure is 6t, and the rolling is repeated twice. Then the rolling head 11 retracts;

[0046] Step 5: Lift the holding device 7 for the steel strip and the steel strip 5, remove the lower backing plate 12, lower the steel strip 5, fix the steel strip 5 downward by the holding device 7 for the steel strip, rotate the weld protection device 8 again and buckle it onto the weld. The secondary heat treatment temperature is 700°C - 800°C, and the heat preservation time is 8s - 15s.

[0047] Specifically, in the above Step 4, there is a gap on the weld protection device 8 for the infrared temperature measuring probe 9 to measure the temperature.

[0048] Specifically, in the above Step 3, rotate the weld protection device 8 and buckle it onto the weld, and perform heating. The heating temperature is 735°C, and the heat preservation time is 10s.

[0049] Specifically, in the above Step 5, the secondary heat treatment temperature is 735°C, and the heat preservation time is 10s.

[0050] The thermomechanical treatment process method of this Embodiment 2 performs heat treatment on the welding position through medium frequency, reduces the hardness of the weld, makes the hardness of the weld and the heat-affected zone closer, then improves the structural arrangement of the tissue through the deformation method of rolling, reduces the tissue spacing, increases the hardness of the weld and the heat-affected zone, and then performs heat treatment again to eliminate the residual stress of the weld, making the hardness and tissue closer to or slightly higher than that of the base material, so that the pipe avoids the heat-affected zone during use or makes the tissue and hardness of the welding position the same as those of the base material.

[0051] The above-described embodiments are only descriptions of the preferred modes of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A thermomechanical treatment process method, characterized in that, the equipment for thermomechanical treatment includes a machine body, a frame body and a top seat. The top seat is connected above the machine body through the frame body. A processing position is arranged on the upper surface of the machine body. A steel strip is placed at the processing position. The steel strip is introduced into the processing position by a steel strip guide wheel. Symmetrically arranged on both sides of the processing position and capable of lifting are upper pressing devices for the steel strip. The upper pressing devices for the steel strip can press and clamp both ends of the steel strip downward. On one side of the processing position, there is a weld protection device that can be buckled on the steel strip and a lower backing plate that can be moved under the steel strip. Below the processing position, there is a lower heating intermediate frequency probe, and above it, there is a rolling head that can move up and down; there are two steel strip guide wheels, which are respectively used for introducing and discharging the steel strip. The bottom of the steel strip guide wheel is connected with a telescopic cylinder, and the telescopic cylinder is connected with the machine body; the weld protection device rotates and buckles on the steel strip, and the lower backing plate horizontally rotates and moves under the steel strip; inside the frame body, there is an infrared temperature measuring probe, and there is a gap on the weld protection device for the infrared temperature measuring probe to measure temperature; the top seat is slidably connected with an oil cylinder, the bottom of the oil cylinder is connected with the rolling head, and on one side of the rolling head, there is a driving cylinder that can drive the rolling head to move horizontally; inside the weld protection device, there is a protective gas, and the protective gas is argon; the thermomechanical treatment process method includes the following steps: Step 1, use the laser on the top seat to align the weld of the steel strip and the lower heating intermediate frequency probe; Step 2, the upper pressing devices for the steel strip press and clamp both ends of the steel strip downward to prevent the steel strip from moving; Step 3, rotate and buckle the weld protection device onto the weld, heat it, the heating temperature is 735 °C, and keep it warm for 10 s; Step 4, rotate the weld protection device away from the weld, lift the upper pressing devices for the steel strip and the steel strip, move the lower backing plate under the steel strip, then put down the steel strip, the upper pressing devices for the steel strip fix the steel strip downward, the driving cylinder drives the rolling wheel of the rolling head to move back and forth, and then the oil cylinder drives the rolling head to press downward. The pressing force is 6 t, and the rolling is reciprocated twice, and then the rolling head retracts; there is a gap on the weld protection device for the infrared temperature measuring probe to measure temperature; Step 5, lift the upper pressing devices for the steel strip and the steel strip, remove the lower backing plate, put down the steel strip, the upper pressing devices for the steel strip fix the steel strip downward, and rotate and buckle the weld protection device onto the weld again. The secondary heat treatment temperature is 735 °C, and keep it warm for 10 s.

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