Heat treatment straightening method and device for TA1 titanium alloy ribbed tube

Abstract

The invention relates to the field of titanium alloy heat treatment and straightening, in particular to a heat treatment straightening method and device for a TA1 titanium alloy ribbed tube, which can effectively reduce rib damage or deformation in a straightening process at the same time under the condition of low temperature (less than 500 DEG C). Comprising the following steps that a, the two ends of the titanium alloy ribbed pipe needing to be treated are fixedly arranged on a movable clamping base and a fixed clamping base correspondingly; b, electric clamps are clamped at the two ends of the titanium alloy ribbed tube respectively; c, pulse power supply parameters are set, so that the transverse tensile stress of the titanium alloy ribbed tube reaches a yield value; d, enabling a probe of the temperature measuring instrument to be aligned with the titanium alloy ribbed tube; carrying out heat treatment and straightening on the titanium alloy ribbed tube; and e, the pulling force between the movable clamping base and the fixed clamping base is kept, the titanium alloy ribbed pipe is taken down from the movable clamping base and the fixed clamping base after the temperature of the titanium alloy ribbed pipe is reduced to 50 DEG C or below, and heat treatment and straightening are completed. The method is suitable for the heat treatment and straightening process of the small-diameter titanium alloy ribbed tube.

Description

Technical Field

[0001] The present invention relates to the field of titanium alloy heat treatment and straightening, in particular to a heat treatment and straightening method and device for a ribbed tube made of TA1 titanium alloy. Background Art

[0002] The ribbed tube made of titanium alloy is a special pipe used in the fields of heat exchange and flow guiding. It can not only withstand a greater working pressure than ordinary pipe fittings, but also meet the requirements of component lightweight and long life. The ribbed tube made of titanium alloy is widely used in heat exchange equipment, aerospace, and marine engineering and other fields.

[0003] The current titanium alloy heat treatment process first needs to be heated in a high-temperature environment of a vacuum furnace and kept warm for a certain period of time. Due to the need for high temperature, the process cycle is relatively long. At the same time, when straightening the ribbed tube made of titanium alloy by using a straightening device, due to the influence of the aforementioned titanium alloy heat treatment process, the probability of rib damage or deformation will increase, and it is difficult to ensure that the rib shape of the ribbed tube made of titanium alloy is not affected. Therefore, there is currently no good treatment method for the straightening treatment of the ribbed tube made of titanium alloy. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a heat treatment and straightening method and device for a ribbed tube made of TA1 titanium alloy that realizes heat treatment under low-temperature conditions and effectively reduces rib damage or deformation in the straightening process.

[0005] The technical solution adopted by the present invention to solve its technical problems is: the heat treatment and straightening method for a ribbed tube made of TA1 titanium alloy includes the following steps: a. Driving the movable clamping seat to move relative to the fixed clamping seat, and then fixing the two ends of the TA1 titanium alloy ribbed tube to be processed on the movable clamping seat and the fixed clamping seat respectively; b. Clamping the electric clamps on the two ends of the TA1 titanium alloy ribbed tube respectively; c. Setting the pulse power supply parameters, controlling the motor to drive the movable clamping seat to move away from the fixed clamping seat, so that the transverse tensile stress of the TA1 titanium alloy ribbed tube reaches the yield value; d. Adjusting the thermometer so that the probe of the thermometer is aligned with the TA1 titanium alloy ribbed tube; then starting the pulse power supply to perform heat treatment and straightening on the TA1 titanium alloy ribbed tube; e. After the pulse power supply stops, maintaining the tension between the movable clamping seat and the fixed clamping seat, waiting for the temperature of the TA1 titanium alloy ribbed tube to drop below 50 °C, and removing the TA1 titanium alloy ribbed tube from the movable clamping seat and the fixed clamping seat to complete heat treatment and straightening.

[0006] Further, in step a, iron plugs or steel plugs are placed at both ends of the TA1 titanium alloy ribbed tube to be processed, and then the two ends of the TA1 titanium alloy ribbed tube are respectively fixed on the four-jaw chucks of the movable clamping seat and the four-jaw chucks of the fixed clamping seat.

[0007] Furthermore, the size specifications of the iron or steel plug are: outer diameter φ4.9 mm and length 50 mm.

[0008] Furthermore, in step c, the pulse power supply parameters are: current 15 A, duty cycle 15%, frequency 100 HZ, and the pulse current output time lasts for 2 - 10 min.

[0009] The heat treatment and straightening device for TA1 titanium alloy ribbed pipes includes a working platform, on which a movable clamping seat and a fixed clamping seat are arranged. The movable clamping seat slides along the working platform driven by a movable clamping seat driving device. The distance between the movable clamping seat and the fixed clamping seat is adapted to the length of the TA1 titanium alloy ribbed pipe to be processed. It includes a conductive clamp, which is arranged on the TA1 titanium alloy ribbed pipe to be processed, and the conductive clamp is electrically connected to the pulse power supply;

[0010] It includes a thermometer, and the probe of the thermometer is arranged towards the direction of the TA1 titanium alloy ribbed pipe.

[0011] Furthermore, the movable clamping seat driving device includes a stepless speed change motor and a lead screw. One end of the lead screw is connected to the output shaft of the stepless speed change motor. The lead screw is arranged in parallel with the TA1 titanium alloy ribbed pipe to be processed, and the lead screw is in threaded fit with the movable clamping seat.

[0012] Furthermore, it includes a control cabinet, and the control cabinet is electrically connected to the pulse power supply, the stepless speed change motor, and the thermometer.

[0013] The beneficial effects of the present invention are as follows: First, by introducing pulse current through the pulse power supply, the pulse current provides kinetic energy for the atoms inside the TA1 titanium alloy ribbed pipe, accelerates the movement of dislocations, overcomes the obstacles of the slip system, reduces the flow stress of the TA1 titanium alloy ribbed pipe, enables the microstructure of the TA1 titanium alloy ribbed pipe to be rapidly improved even at low temperatures (below 400°C), significantly improves the plasticity, realizes heat treatment under low-temperature conditions, and effectively reduces the probability of subsequent rib damage or deformation. Second, the heat treatment and straightening processes are organically combined. By using the tensile force between the movable clamping seat and the fixed clamping seat, and the low-temperature heat treatment of the pulse current below 400°C, the heat treatment and straightening of the TA1 titanium alloy ribbed pipe are realized under low-temperature heat treatment and shorter straightening time, greatly improving the production efficiency. In addition, the structure of the relevant equipment is streamlined, the requirements for the equipment use environment are simpler, and the overall equipment cost is relatively low. Third, after the TA1 titanium alloy ribbed pipe undergoes heat treatment and straightening composite treatment, the straightness < 1 mm / m, and the room-temperature mechanical properties are Rm: 268 MPa, R p0.2 : 195 MPa, A%: 46. The present invention is particularly applicable to the composite process of simultaneously realizing heat treatment and straightening under low-temperature (<500°C) conditions. Description of the Drawings

[0014] Figure 1 It is a schematic diagram of an embodiment of the heat treatment device for the TA1 titanium alloy ribbed pipe of the present invention.

[0015] The markings in the figure are: control cabinet 1, pulse power supply 2, electric clamp 3, TA1 titanium alloy ribbed pipe 4, movable clamping seat 5, fixed clamping seat 51, working platform 6, temperature measuring instrument 7, stepless speed change motor 8, lead screw 9, platform support column 10. Detailed Embodiments

[0016] The present invention will be further described below in conjunction with the drawings and embodiments.

[0017] As shown in Figure 1 the heat treatment and straightening device for the TA1 titanium alloy ribbed pipe. The working platform 6 is arranged on the platform support column 10. The working platform 6 extends in a straight line direction, and the top surface of the working platform 6 is horizontally arranged. The fixed clamping seat 51 is fixedly arranged on the left side of the top surface of the working platform 6, while the movable clamping seat 5 is slidably arranged on the slide rail on the top surface of the working platform 6. The movable clamping seat 5 is in threaded engagement with the lead screw 9. The lead screw 9 extends along the direction of the working platform 6. The lead screw 9 is driven by a stepless speed change motor 8. One end of the lead screw 9 is connected to the output shaft of the stepless speed change motor 8. The lead screw 9 is parallel to the TA1 titanium alloy ribbed pipe 4 to be processed. The lead screw 9 is in threaded engagement with the movable clamping seat 5. The lead screw 9 can be a rectangular tooth lead screw to ensure the strength and stability of the driving force transmitted from the lead screw 9 to the movable clamping seat 5. When it is necessary to adjust the distance between the movable clamping seat 5 and the fixed clamping seat 51, only need to let the control cabinet 1 adjust the rotation direction of the stepless speed change motor 8, and let the stepless speed change motor 8 drive the lead screw 9 to drive the movable clamping seat 5 to move along the slide rail on the top surface of the working platform 6. The distance between the movable clamping seat 5 and the fixed clamping seat 51 is based on the length of the TA1 titanium alloy ribbed pipe 4, and it is appropriate to ensure that both ends of the TA1 titanium alloy ribbed pipe 4 can be arranged on the movable clamping seat 5 and the fixed clamping seat 51. The movable clamping seat 5 and the fixed clamping seat 51 clamp the TA1 titanium alloy ribbed pipe 4 through their respective four-jaw chucks.

[0018] As shown in Figure 1As shown in the figure, after the two ends of the TA1 titanium alloy ribbed pipe 4 are respectively fixed on the movable clamping seat 5 and the fixed clamping seat 51, the two electric clamps 3 are sleeved on the two ends of the TA1 titanium alloy ribbed pipe 4 through the notches on the electric clamps 3. The electric clamp 3 is connected to the pulse power supply 2, and the pulse current is transmitted to the TA1 titanium alloy ribbed pipe 4 through the electric clamp 3, so as to realize the heat treatment of the TA1 titanium alloy ribbed pipe 4. A thermometer 7 is arranged on the working platform 6, and the probe of the thermometer 7 is arranged towards the TA1 titanium alloy ribbed pipe 4 to measure the temperature of the TA1 titanium alloy ribbed pipe 4 in real time. The thermometer 7 can be an infrared thermometer, and the measurement range is 0 - 800 °C. Preferably, the probe of the thermometer 7 is arranged towards the middle section position of the TA1 titanium alloy ribbed pipe 4.

[0019] The control cabinet 1 is electrically connected to the pulse power supply 2, the stepless speed change motor 8 and the thermometer 7. The pulse power supply 2 can be a numerically controlled bidirectional pulse power supply, and the parameters that can be set include voltage, current (0 - 100 A), frequency (0 - 200 HZ), duty cycle (0 - 100%), etc., and it can output different pulse current processes to realize the heat treatment of different specifications of pipes.

[0020] The heat treatment and straightening method of the TA1 titanium alloy ribbed pipe includes the following steps: a. Drive the movable clamping seat 5 to move relative to the fixed clamping seat 51, and then fix the two ends of the TA1 titanium alloy ribbed pipe 4 to be processed on the movable clamping seat 5 and the fixed clamping seat 51 respectively; b. Clamp the electric clamps 3 on the two ends of the TA1 titanium alloy ribbed pipe 4 respectively; c. Set the parameters of the pulse power supply 2, and control the motor to drive the movable clamping seat 5 to move away from the fixed clamping seat 51, so that the transverse tensile stress of the TA1 titanium alloy ribbed pipe 4 reaches the yield value; d. Adjust the thermometer 7 so that the probe of the thermometer 7 is aligned with the TA1 titanium alloy ribbed pipe 4; then start the pulse power supply 2 to carry out heat treatment and straightening on the TA1 titanium alloy ribbed pipe 4; e. After the pulse power supply 2 stops, keep the tension between the movable clamping seat 5 and the fixed clamping seat 51. Wait until the temperature of the TA1 titanium alloy ribbed pipe 4 drops below 50 °C, and then remove the TA1 titanium alloy ribbed pipe 4 from the movable clamping seat 5 and the fixed clamping seat 51 to complete the heat treatment and straightening.

[0021] Among them, in step a, iron plugs or steel plugs are placed at the two ends of the TA1 titanium alloy ribbed pipe 4 to be processed, and then the two ends of the TA1 titanium alloy ribbed pipe 4 are respectively fixed on the four-jaw chucks of the movable clamping seat 5 and the four-jaw chucks of the fixed clamping seat 51 to prevent the four-jaw chucks from flattening or deforming the end parts of the clamped TA1 titanium alloy ribbed pipe 4. Preferably, the size specifications of the iron plugs or steel plugs are: outer diameter φ4.9 mm, length 50 mm.

[0022] Embodiment

[0023] Select TA1 titanium alloy ribbed tube 4 for heat treatment and straightening. The specification is φ8*1.5*2500mm (outer diameter * wall thickness * length). The rib height on the outer wall of TA1 titanium alloy ribbed tube 4 is 0.5mm, and the number of ribs is 4.

[0024] The working process is as follows:

[0025] Step 1: Insert plugs made of iron or steel with an outer diameter of φ4.9*50mm (outer diameter * length) at both ends of the TA1 titanium alloy ribbed tube 4 to be processed to prevent the clamping seat from squeezing and detaching the tube during work.

[0026] Step 2: Turn on the power of the control cabinet 1, control the movable clamping seat 5 to move to a position suitable for the length of the TA1 titanium alloy ribbed tube 4, loosen the four-jaw chucks of the TA1 titanium alloy ribbed tube 4 and the movable clamping seat 5 respectively, place the TA1 titanium alloy ribbed tube 4 into the four-jaw chuck, rotate the TA1 titanium alloy ribbed tube 4 and tighten the chuck to ensure that the four-jaw chuck is clamped on the base circle smooth surface of the TA1 titanium alloy ribbed tube 4.

[0027] Step 3: Clamp the electric clamps 3 at both ends of the TA1 titanium alloy ribbed tube 4 respectively.

[0028] Step 4: Set the parameters of the pulse power supply 2: current 15A, duty cycle 15%, frequency 100HZ, pulse current output time 2min.

[0029] Step 5: Control the stepless variable speed motor 8 to move the movable clamping seat 5 so that the transverse tensile stress of the TA1 titanium alloy ribbed tube 4 reaches the yield value of the TA1 titanium alloy ribbed tube 4.

[0030] Step 6: Adjust the thermometer 7 so that the probe of the thermometer 7 is aligned with the middle of the TA1 titanium alloy ribbed tube 4.

[0031] Step 7: Start the pulse power supply 2 to start heat treatment and straightening of the TA1 titanium alloy ribbed tube 4.

[0032] Step 8: After the pulse power supply 2 stops, maintain the tension between the movable clamping seat 5 and the fixed clamping seat 51. Wait until the temperature of the TA1 titanium alloy ribbed tube 4 drops below 50°C, then open the four-jaw chucks of the movable clamping seat 5 and the fixed clamping seat 51, and remove the TA1 titanium alloy ribbed tube 4. Thus, the heat treatment and straightening of the TA1 titanium alloy ribbed tube 4 are completed.

[0033] For the above TA1 titanium alloy ribbed tube 4, after heat treatment and straightening composite treatment, the straightness <1mm / m, the room temperature mechanical properties are Rm: 268MPa, R p0.2 : 195MPa, A%: 46. At the same time, the processing time of heat treatment and straightening is also greatly shortened, and the processing efficiency is significantly improved.

Claims

1. Heat treatment and straightening method for TA1 titanium alloy ribbed pipe, comprising the following steps: a. Drive the movable clamping seat (5) to move relative to the fixed clamping seat (51), and then fix both ends of the TA1 titanium alloy ribbed pipe (4) to be processed on the movable clamping seat (5) and the fixed clamping seat (51) respectively; b. Clamp the electric clamps (3) on both ends of the TA1 titanium alloy ribbed pipe (4) respectively; c. Set the parameters of the pulse power supply (2), control the motor to drive the movable clamping seat (5) to move away from the fixed clamping seat (51), so that the transverse tensile stress of the TA1 titanium alloy ribbed pipe (4) reaches the yield value; d. Adjust the thermometer (7) so that the probe of the thermometer (7) is aligned with the TA1 titanium alloy ribbed pipe (4); then start the pulse power supply (2) to perform heat treatment and straightening on the TA1 titanium alloy ribbed pipe (4); e. After the pulse power supply (2) stops, maintain the tension between the movable clamping seat (5) and the fixed clamping seat (51). Wait until the temperature of the TA1 titanium alloy ribbed pipe (4) drops below 50 °C, and then remove the TA1 titanium alloy ribbed pipe (4) from the movable clamping seat (5) and the fixed clamping seat (51) to complete the heat treatment and straightening.

2. The heat treatment and straightening method of the TA1 titanium alloy ribbed pipe according to claim 1, characterized in that: In step a, iron plugs or steel plugs are placed at both ends of the TA1 titanium alloy ribbed pipe (4) to be processed, and then both ends of the TA1 titanium alloy ribbed pipe (4) are respectively fixed on the four-jaw chuck of the movable clamping seat (5) and the four-jaw chuck of the fixed clamping seat (51).

3. The heat treatment and straightening method of the TA1 titanium alloy ribbed pipe according to claim 2, characterized in that: The size specifications of the iron plugs or steel plugs are: outer diameter φ4.9 mm, length 50 mm.

4. The heat treatment and straightening method of the TA1 titanium alloy ribbed pipe according to any one of claims 1 to 3, characterized in that: In step c, the parameters of the pulse power supply (2) are: current 15 A, duty cycle 15%, frequency 100 HZ, and the pulse current output time lasts for 2 - 10 min.

5. Heat treatment and straightening device for TA1 titanium alloy ribbed pipe, characterized in that: It includes a working platform (6), on which a movable clamping seat (5) and a fixed clamping seat (51) are arranged. The movable clamping seat (5) slides along the working platform (6) driven by a movable clamping seat driving device. The distance between the movable clamping seat (5) and the fixed clamping seat (51) is adapted to the length of the TA1 titanium alloy ribbed pipe (4) to be processed. It is characterized in that: It includes a conductive clamp (3), which is arranged on the TA1 titanium alloy ribbed pipe (4) to be processed, and the conductive clamp (3) is electrically connected to the pulse power supply (2); It includes a thermometer (7), and the probe of the thermometer (7) is arranged towards the TA1 titanium alloy ribbed pipe (4); 6. The heat treatment and straightening device for the TA1 titanium alloy ribbed pipe according to claim 5, wherein: The movable clamping seat driving device includes a stepless speed change motor (8) and a lead screw (9). One end of the lead screw (9) is connected to the output shaft of the stepless speed change motor (8). The lead screw (9) is arranged in parallel with the TA1 titanium alloy ribbed pipe (4) to be processed, and the lead screw (9) is in threaded fit connection with the movable clamping seat (5).

7. The heat treatment and straightening device for the TA1 titanium alloy ribbed pipe according to claim 6, characterized in that: It includes a control cabinet (1), and the control cabinet (1) is electrically connected to the pulse power supply (2), the stepless speed change motor (8) and the thermometer (7).

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