A vertical heat treatment component for heat treatment of thin-walled tubes and application method

Abstract

The invention discloses a vertical heat treatment component for heat treatment of a thin-walled tube, comprising a quartz glass component, a thin-walled tube plug, a weight and a constant current source; the quartz glass component comprises a quartz glass tube, an upper quartz glass tube end plug, a lower quartz glass tube end plug, an upper quartz glass port and a lower quartz glass port; the upper quartz glass tube end plug and the lower quartz glass tube end plug are detachably mounted on both ends of the quartz glass tube; the thin-walled tube plug comprises an upper vent pipe, an upper end plug, an upper fixing chuck, a lower vent pipe, a lower end plug and a lower fixing chuck; the upper vent pipe is detachably mounted in the upper end plug, and the lower vent pipe is detachably mounted in the lower end plug; the weight is detachably mounted on the lower fixing chuck. The invention uses the vertical heat treatment component for heat treatment of a thin-walled tube comprising the quartz glass component, the thin-walled tube plug, the weight and the constant current source to perform heat treatment on the thin-walled tube, and has the characteristics of high temperature control accuracy and simple structure.

Description

Technical Field

[0001] The invention belongs to the technical field of metal material processing, and in particular relates to a vertical heat treatment component for heat treatment of a thin-walled tube and an application method thereof. Background Art

[0002] High-precision thin-walled tubes require high straightness, high grain size uniformity, and high dimensional accuracy, and are widely used in core technical parts in various fields. Because of its thin wall thickness, in order to ensure the consistency of mechanical properties and service safety, there are strict restrictions on the size of the grain (grain size), and there are also strict requirements on the size distribution of the grain size (grain size range), and the straightness is usually extremely strict. Some products even require the straightness to meet the requirement of 0.02mm / m.

[0003] Existing heat treatment methods include vacuum heat treatment, atmospheric heat treatment, and continuous heat treatment in a protective atmosphere. Because the wall of the thin-walled tube is thin, it is heated and cooled unevenly during the heating and cooling process, and deformation will occur. This deformation includes bending deformation in the length direction and deformation of the roundness in the circumferential direction. At the same time, it is accompanied by uneven microstructure grain size. This results in the thin-walled tube being difficult to meet the dimensional tolerance requirements in the straightness and size during the later straightening process, and the yield is low. The uneven grain size will also cause significant differences in mechanical properties. At present, there are several difficulties in the heat treatment of thin-walled tubes: 1) Deformation is prone to occur during the heat treatment process, making it difficult for the thin-walled tube to reach a straightness of 0.02mm / m; 2) Uneven heating during the heat treatment process can easily lead to changes in size, which may even lead to scrapping due to size changes; 3) The extreme batch stability of the grain size is difficult to meet the extreme 1.0 requirement. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a vertical heat treatment component for heat treatment of thin-walled tubes and an application method thereof in view of the above-mentioned deficiencies of the prior art. The vertical heat treatment component for heat treatment of thin-walled tubes of the present invention performs heat treatment on thin-walled tubes through a quartz glass component, a thin-walled tube plug, a weight and a constant current source, and has the characteristics of high temperature control accuracy and simple structure.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a vertical heat treatment assembly for heat treatment of thin-walled tubes, characterized in that it includes a quartz glass assembly, a thin-walled tube plug, a weight and a constant current source;

[0006] The quartz glass assembly comprises a quartz glass tube, an upper quartz glass tube end plug, a lower quartz glass tube end plug, an upper quartz glass port and a lower quartz glass port; the upper quartz glass tube end plug and the lower quartz glass tube end plug are detachably mounted on both ends of the quartz glass tube, the upper quartz glass port is opened on the upper side of the quartz glass tube, and the lower quartz glass port is arranged on the lower quartz glass tube end plug;

[0007] The thin-walled pipe plug comprises an upper vent pipe, an upper end plug, an upper fixing chuck, a lower vent pipe, a lower end plug and a lower fixing chuck; the upper vent pipe is detachably installed in the upper end plug, and the lower vent pipe is detachably installed in the lower end plug; the weight is detachably installed on the lower fixing chuck.

[0008] The above-mentioned vertical heat treatment assembly for heat treatment of thin-walled tubes is characterized in that the verticality of the quartz glass tube is ≤0.02mm / m and the straightness is ≤0.1mm / m.

[0009] The above-mentioned vertical heat treatment assembly for heat treatment of thin-walled tubes is characterized in that both the upper quartz glass tube end plug and the lower quartz glass tube end plug are provided with openings for passing through the thin-walled tube to be solid-solutionized.

[0010] In addition, the present invention also provides a method for vertical heat treatment using the vertical heat treatment assembly for heat treatment of thin-walled tubes, which is characterized by comprising:

[0011] Step 1: Set the quartz glass tube vertically;

[0012] Step 2: insert the thin-walled tube to be solid-solution-treated into the quartz glass tube, sleeve the upper quartz glass tube end plug on the thin-walled tube to be solid-solution-treated and then install it on the upper part of the quartz glass tube, sleeve the lower quartz glass tube end plug on the thin-walled tube to be solid-solution-treated and then install it on the lower part of the quartz glass tube;

[0013] Step 3: Install the upper ventilation pipe on the upper end plug, install the upper end plug equipped with the upper ventilation pipe on the upper part of the thin-walled tube to be solid-solutionized, clamp the upper fixing chuck on the upper part of the thin-walled tube to be solid-solutionized, and connect the upper fixing chuck to the constant current source;

[0014] Step 4: install the lower ventilation pipe on the lower end plug, install the lower end plug equipped with the lower ventilation pipe on the lower part of the thin-walled tube to be solid-solutionized, clamp the lower fixing chuck on the lower part of the thin-walled tube to be solid-solutionized, and connect the lower fixing chuck to the constant current source;

[0015] Step 5: Install the weight on the lower fixing chuck;

[0016] Step 6: introducing protective gas into the thin-walled tube to be solid-solution through the lower ventilation pipe, and the protective gas entering the thin-walled tube to be solid-solution is discharged from the upper ventilation pipe to discharge the air in the thin-walled tube to be solid-solution, introducing protective gas into the quartz glass tube through the lower quartz glass port, and the protective gas entering the quartz glass tube is discharged from the upper quartz glass port to discharge the air in the quartz glass tube;

[0017] Step 7: Under the condition of continuous introduction of protective gas, start the constant current source power supply, perform electric solution heat treatment on the thin-walled tube to be treated, monitor the temperature in real time, and cut off the power when the solution temperature is reached. At the same time, increase the gas flow rate of the upper ventilation pipe for gas quenching cooling;

[0018] Step 8: After cooling, the thin-walled tube is disassembled. The portion beyond the quartz glass tube is the portion that is not effectively dissolved. The portion that is not effectively dissolved is cut off to obtain the thin-walled tube after heat treatment.

[0019] The above method is characterized in that, in step 2, the size of the thin-walled tube to be solid-solution-formed is Φ(10-60)×(0.08-0.55)×L(mm).

[0020] The above method is characterized in that, in step three, the constant current of the constant current source is 40A to 1450A.

[0021] The above method is characterized in that, in step five, the weight mass is ≤80% of the minimum yield strength, and the minimum yield strength is the minimum yield strength of the thin-walled tube to be solid-solutionized at the solution temperature.

[0022] The above method is characterized in that, in step six, the protective gas is argon or nitrogen.

[0023] The above method is characterized in that the thin-walled tube to be solid-solutioned in step one is a stainless steel glass tube to be solid-solutioned, and in step seven, the solid-solution temperature is 1000°C to 1150°C.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1. The present invention provides a vertical heat treatment component for heat treatment of thin-walled tubes, which includes a quartz glass component, a thin-walled tube plug, a weight and a constant current source. The thin-walled tube can be heat treated and has the characteristics of high temperature control accuracy and simple structure.

[0026] 2. Compared with the traditional heat treatment method, the vertical heat treatment method of the present invention can accurately control the heat treatment temperature. Under the condition of atmosphere protection, it can effectively avoid the oxidation of the inner and outer surfaces of the thin-walled tube during the solid solution process, and obtain a thin-walled tube with high grain accuracy. The extreme difference of grain size is ≤0.5 level, the straightness is ≤0.02mm / m, the root outer diameter deviation can be controlled at 0.01mm, and the roundness is ≤0.015mm.

[0027] 3. The vertical heat treatment method of the present invention is suitable for solution heat treatment of thin-walled metal tubes, preferably for tubes with a cross-sectional area of ​​less than 200 mm. 2 The following thin-walled tube heat treatment, heat-treated thin-walled tube grain uniformity is high, meeting the technical requirements of high dimensional precision thin-walled tube.

[0028] 4. The vertical heat treatment method of the present invention is easy to operate, has a simple device, and is easy to promote and apply.

[0029] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the vertical heat treatment assembly for heat treatment of thin-walled tubes in Example 1.

[0031] 11—quartz glass tube; 12—upper quartz glass tube end plug; 13—lower quartz glass tube end plug;

[0032] 14—upper quartz glass port; 15—lower quartz glass port;

[0033] 2—thin-wall tube to be solid-solution treated; 31—upper ventilation tube; 32—upper end plug;

[0034] 33—upper fixing chuck; 41—lower vent pipe; 42—lower end plug;

[0035] 43—Lower fixing chuck; 5—Weight. DETAILED DESCRIPTION Example

[0036] This embodiment provides a vertical heat treatment assembly for heat treatment of thin-walled tubes, such as Figure 1 As shown, the vertical heat treatment assembly includes a quartz glass assembly, a thin-walled tube plug, a weight 5 and a constant current source;

[0037] The quartz glass assembly comprises a quartz glass tube 11, an upper quartz glass tube end plug 12, a lower quartz glass tube end plug 13, an upper quartz glass port 14, and a lower quartz glass port 15; the quartz glass tube 11 has a verticality of ≤0.02 mm / m and a straightness of ≤0.1 mm / m; the upper quartz glass tube end plug 12 and the lower quartz glass tube end plug 13 are detachably mounted on both ends of the quartz glass tube 11, and both the upper quartz glass tube end plug 12 and the lower quartz glass tube end plug 13 are provided with openings for passing through the thin-walled tube 2 to be solid-solutionized; the upper quartz glass port 14 is provided on the upper side of the quartz glass tube 11, and the lower quartz glass port 15 is provided on the lower quartz glass tube end plug 13;

[0038] The thin-walled pipe plug comprises an upper vent pipe 31, an upper end plug 32, an upper fixing chuck 33, a lower vent pipe 41, a lower end plug 42 and a lower fixing chuck 43; the upper vent pipe 31 is detachably installed in the upper end plug 32, and the lower vent pipe 41 is detachably installed in the lower end plug 42; the weight 5 is detachably installed on the lower fixing chuck 43. Example

[0039] This embodiment provides a method for vertically heat treating a thin-walled tube 2 to be subjected to solid solution heat treatment using the vertical heat treatment assembly for thin-walled tube heat treatment of embodiment 1, comprising:

[0040] Step 1, vertically arranging the quartz glass tube 11; the vertically arranging the quartz glass tube 11 can be performed by vertically fixing the quartz glass tube 11 on a bracket;

[0041] Step 2: insert the thin-walled tube 2 to be solid-solution-treated into the quartz glass tube 11, sleeve the upper quartz glass tube end plug 12 on the thin-walled tube 2 to be solid-solution-treated and then install it on the upper part of the quartz glass tube 11, sleeve the lower quartz glass tube end plug 13 on the thin-walled tube 2 to be solid-solution-treated and then install it on the lower part of the quartz glass tube 11; the length of the thin-walled tube 2 to be solid-solution-treated that exceeds the upper quartz glass tube end plug 12 is substantially the same as the length of the thin-walled tube 2 to be solid-solution-treated that exceeds the lower quartz glass tube end plug 13; the size of the thin-walled tube 2 to be solid-solution-treated is Φ29×0.32×L (mm); sleeve the lower quartz glass tube end plug 13 on the thin-walled tube 2 to be solid-solution-treated and then install it on the lower part of the quartz glass tube 11; The glass tube end plug 13 is installed at the lower part of the quartz glass tube 11 by fixing the bracket or using the friction between the lower quartz glass tube end plug 13 and the inner wall of the quartz glass tube 11 to prevent it from falling off; the thin-walled tube 2 to be solid-solutioned is a stainless steel glass tube to be solid-solutioned. The method for vertical heat treatment of the present invention is not limited to stainless steel thin-walled tubes to be solid-solutioned, and can also be other materials, such as titanium tubes, titanium alloy tubes, molybdenum tubes, molybdenum alloy tubes, niobium tubes, tantalum tubes, niobium alloy tubes or tantalum alloy tubes;

[0042] Step 3, install the upper ventilation pipe 31 on the upper end plug 32, install the upper end plug 32 equipped with the upper ventilation pipe 31 on the upper part of the thin-walled tube 2 to be solid-solutionized, clamp the upper fixing clamp 33 on the upper part of the thin-walled tube 2 to be solid-solutionized, and connect the upper fixing clamp 33 to a constant current source, the constant current is 450A; the constant current source is a device commonly used in the art that can output a stable constant current; the applied current can be adjusted according to the material and cross-sectional area of ​​the thin-walled tube;

[0043] Step 4: Install the lower ventilation pipe 41 on the lower end plug 42, install the lower end plug 42 equipped with the lower ventilation pipe 41 on the lower part of the thin-walled tube 2 to be solid-solutionized, clamp the lower fixing chuck 43 on the lower part of the thin-walled tube 2 to be solid-solutionized, and connect the lower fixing chuck 43 to the constant current source;

[0044] Step 5, install a 50kg weight 5 on the lower fixed chuck 43; the weight 5 mass ≤ 80% of the minimum yield strength, the minimum yield strength is the minimum yield strength of the thin-walled tube 2 to be solid-solutionized at the corresponding solid solution temperature, the minimum yield strength is determined by a short-time high-temperature tensile test, and the reference standard is GB / T 228.2; the weight 5 can be installed on the lower fixed chuck 43 by a bolt and nut assembly;

[0045] Step 6: Pass a protective gas into the thin-walled tube 2 to be solid-solutionized through the lower ventilation pipe 41, and the protective gas entering the thin-walled tube 2 to be solid-solutionized is discharged from the upper ventilation pipe 31 to discharge the air in the thin-walled tube 2 to be solid-solutionized, and pass a protective gas into the quartz glass tube 11 through the lower quartz glass port 15, and the protective gas entering the quartz glass tube 11 is discharged from the upper quartz glass port 14 to discharge the air in the quartz glass tube 11; the protective gas is argon gas;

[0046] Step 7, under the condition of continuous introduction of protective gas, start the constant current source power supply, perform electric solution heat treatment on the thin-walled tube 2 to be treated, monitor the temperature in real time, and cut off the power when the solution temperature is reached. At the same time, increase the gas flow of the upper ventilation pipe 31 for gas quenching cooling; the solution temperature is 1000°C; when the solution temperature is reached, test it through an infrared temperature measuring device arranged at the upper quartz glass port 14; the increased gas flow rate can be not less than 25L / min, and the pressure is 0.25 MPa;

[0047] Step 8: After cooling, the thin-walled tube is disassembled according to the clamping order. The part beyond the quartz glass tube 11 is the part that is not effectively dissolved. The part that is not effectively dissolved is cut off to obtain a thin-walled tube after heat treatment. The cross-sectional area of ​​the thin-walled tube after heat treatment is 28.8 mm 2 ; The measured grain size of the thin-walled tube head, middle and tail after heat treatment is 9.0, with a range of 0;

[0048] Step nine, straightening the heat-treated thin-walled tube, wherein the straightness of the thin-walled tube after straightening is ≤0.02 mm / m, the outer diameter deviation of the through-root is 0.01 mm, and the roundness is ≤0.01 mm. Example

[0049] This embodiment provides a method for vertically heat treating a thin-walled tube 2 to be subjected to solid solution heat treatment using the vertical heat treatment assembly for thin-walled tube heat treatment of embodiment 1, comprising:

[0050] Step 1, vertically arranging the quartz glass tube 11; the verticality of the quartz glass tube 11 is ≤0.02 mm / m, and the straightness is ≤0.1 mm / m; the vertical arrangement of the quartz glass tube 11 can be performed by vertically fixing the quartz glass tube 11 on a bracket;

[0051] Step 2, insert the thin-walled tube 2 to be solid-solution into the quartz glass tube 11, sleeve the upper quartz glass tube end plug 12 on the thin-walled tube 2 to be solid-solution and then install it on the upper part of the quartz glass tube 11, sleeve the lower quartz glass tube end plug 13 on the thin-walled tube 2 to be solid-solution and then install it on the lower part of the quartz glass tube 11; the length of the thin-walled tube 2 to be solid-solution exceeding the upper quartz glass tube end plug 12 is basically the same as the length of the thin-walled tube 2 to be solid-solution exceeding the lower quartz glass tube end plug 13; the size of the thin-walled tube 2 to be solid-solution is Φ22×0.2×L (mm); installing the lower quartz glass tube end plug 13 at the lower part of the quartz glass tube 11 can be by fixing the bracket or using the friction between the lower quartz glass tube end plug 13 and the inner wall of the quartz glass tube 11, etc., to install the lower quartz glass tube end plug 13 at the lower part of the quartz glass tube 11 to prevent it from falling off; the thin-walled tube 2 to be solid-solution is a stainless steel solid-solution glass tube;

[0052] Step 3, install the upper ventilation pipe 31 on the upper end plug 32, install the upper end plug 32 equipped with the upper ventilation pipe 31 on the upper part of the thin-walled tube 2 to be solid-solutionized, clamp the upper fixing chuck 33 on the upper part of the thin-walled tube 2 to be solid-solutionized, and connect the upper fixing chuck 33 to a constant current source, the constant current is 230A;

[0053] Step 4: Install the lower ventilation pipe 41 on the lower end plug 42, install the lower end plug 42 equipped with the lower ventilation pipe 41 on the lower part of the thin-walled tube 2 to be solid-solutionized, and clamp the lower fixing chuck 43 on the lower part of the thin-walled tube 2 to be solid-solutionized; the lower fixing chuck 43 is connected to the constant current source;

[0054] Step 5, install a 20kg weight 5 on the lower fixed chuck 43; the weight 5 mass ≤ 80% of the minimum yield strength, the minimum yield strength is the minimum yield strength of the thin-walled tube 2 to be solid-solutionized at the corresponding solid solution temperature, the minimum yield strength is determined by a short-time high-temperature tensile test, and the reference standard is GB / T 228.2; the weight 5 can be installed on the lower fixed chuck 43 by a bolt and nut assembly;

[0055] Step 6: Pass protective gas into the thin-walled tube 2 to be solid-solutionized through the lower ventilation pipe 41, and the protective gas entering the thin-walled tube 2 to be solid-solutionized is discharged from the upper ventilation pipe 31 to discharge the air in the thin-walled tube 2 to be solid-solutionized, and pass protective gas into the quartz glass tube 11 through the lower quartz glass port 15, and the protective gas entering the quartz glass tube 11 is discharged from the upper quartz glass port 14 to discharge the air in the quartz glass tube 11; the protective gas is nitrogen;

[0056] Step 7, under the condition of continuous introduction of protective gas, start the constant current source power supply, perform electric solution heat treatment on the thin-walled tube 2 to be treated, monitor the temperature in real time, and cut off the power when the solution temperature is reached. At the same time, increase the gas flow of the upper ventilation pipe 31 for gas quenching cooling; the solution temperature is 1150°C; the solution temperature is reached by testing through an infrared temperature measuring device arranged at the upper quartz glass port 14; the increased gas flow rate can be not less than 25L / min, and the pressure is 0.25 MPa;

[0057] Step 8: After cooling, the thin-walled tube is disassembled according to the clamping order. The part beyond the quartz glass tube 11 is the part that is not effectively dissolved. The part that is not effectively dissolved is cut off to obtain a thin-walled tube after heat treatment. The cross-sectional area of ​​the thin-walled tube after heat treatment is 13.7 mm 2 ; The measured grain size of the thin-walled tube head, middle and tail after heat treatment is 6.0, with a range of 0;

[0058] Step nine, straightening the heat-treated thin-walled tube, wherein the straightness of the thin-walled tube after straightening is ≤0.015 mm / m, the outer diameter deviation of the through root is 0.01 mm, and the roundness is ≤0.01 mm. Example

[0059] This embodiment provides a method for vertically heat treating a thin-walled tube 2 to be subjected to solid solution heat treatment using the vertical heat treatment assembly for thin-walled tube heat treatment of embodiment 1, comprising:

[0060] Step 1, vertically arranging the quartz glass tube 11; the verticality of the quartz glass tube 11 is ≤0.02 mm / m, and the straightness is ≤0.1 mm / m; the vertical arrangement of the quartz glass tube 11 can be performed by vertically fixing the quartz glass tube 11 on a bracket;

[0061] Step 2, insert the thin-walled tube 2 to be solid-solution into the quartz glass tube 11, sleeve the upper quartz glass tube end plug 12 on the thin-walled tube 2 to be solid-solution and then install it on the upper part of the quartz glass tube 11, sleeve the lower quartz glass tube end plug 13 on the thin-walled tube 2 to be solid-solution and then install it on the lower part of the quartz glass tube 11; the length of the thin-walled tube 2 to be solid-solution exceeding the upper quartz glass tube end plug 12 is basically the same as the length of the thin-walled tube 2 to be solid-solution exceeding the lower quartz glass tube end plug 13; the size of the thin-walled tube 2 to be solid-solution is Φ10×0.08×L (mm); installing the lower quartz glass tube end plug 13 at the lower part of the quartz glass tube 11 can be by fixing the bracket or using the friction between the lower quartz glass tube end plug 13 and the inner wall of the quartz glass tube 11, etc., to install the lower quartz glass tube end plug 13 at the lower part of the quartz glass tube 11 to prevent it from falling off; the thin-walled tube 2 to be solid-solution is a stainless steel solid-solution glass tube;

[0062] Step 3, install the upper ventilation pipe 31 on the upper end plug 32, install the upper end plug 32 equipped with the upper ventilation pipe 31 on the upper part of the thin-walled tube 2 to be solid-solutionized, clamp the upper fixing chuck 33 on the upper part of the thin-walled tube 2 to be solid-solutionized, and connect the upper fixing chuck 33 to a constant current source, the constant current is 40A;

[0063] Step 4: Install the lower ventilation pipe 41 on the lower end plug 42, install the lower end plug 42 equipped with the lower ventilation pipe 41 on the lower part of the thin-walled tube 2 to be solid-solutionized, and clamp the lower fixing chuck 43 on the lower part of the thin-walled tube 2 to be solid-solutionized; the lower fixing chuck 43 is connected to the constant current source;

[0064] Step 5, install the 6kg weight 5 on the lower fixed chuck 43; the weight 5 mass ≤ 80% of the minimum yield strength, the minimum yield strength is the minimum yield strength of the thin-walled tube 2 to be solid-solutionized at the corresponding solid solution temperature, the minimum yield strength is determined by a short-time high-temperature tensile test, and the reference standard is GB / T 228.2; the weight 5 can be installed on the lower fixed chuck 43 by a bolt and nut assembly;

[0065] Step 6: Pass a protective gas into the thin-walled tube 2 to be solid-solutionized through the lower ventilation pipe 41, and the protective gas entering the thin-walled tube 2 to be solid-solutionized is discharged from the upper ventilation pipe 31 to discharge the air in the thin-walled tube 2 to be solid-solutionized, and pass a protective gas into the quartz glass tube 11 through the lower quartz glass port 15, and the protective gas entering the quartz glass tube 11 is discharged from the upper quartz glass port 14 to discharge the air in the quartz glass tube 11; the protective gas is argon gas;

[0066] Step 7, under the condition of continuous introduction of protective gas, start the constant current source power supply, perform electric solution heat treatment on the thin-walled tube 2 to be treated, monitor the temperature in real time, and cut off the power when the solution temperature is reached. At the same time, increase the gas flow of the upper ventilation pipe 31 for gas quenching cooling; the solution temperature is 1050°C; the solution temperature is reached by testing through an infrared temperature measuring device arranged at the upper quartz glass port 14; the increased gas flow rate can be not less than 25L / min, and the pressure is 0.25 MPa;

[0067] Step 8: After cooling, the thin-walled tube is disassembled according to the clamping order. The part beyond the quartz glass tube 11 is the part that is not effectively dissolved. The part that is not effectively dissolved is cut off to obtain a thin-walled tube after heat treatment. The cross-sectional area of ​​the thin-walled tube after heat treatment is 2.49 mm 2 ; The measured grain size of the thin-walled tube head, middle and tail after heat treatment is 9.0, with a range of 0;

[0068] Step nine, straightening the heat-treated thin-walled tube, wherein the straightness of the thin-walled tube after straightening is ≤0.01 mm / m, the outer diameter deviation of the through root is 0.01 mm, and the roundness is ≤0.01 mm. Example

[0069] This embodiment provides a method for vertically heat treating a thin-walled tube 2 to be subjected to solid solution heat treatment using the vertical heat treatment assembly for thin-walled tube heat treatment of embodiment 1, comprising:

[0070] Step 1, vertically arranging the quartz glass tube 11; the verticality of the quartz glass tube 11 is ≤0.02 mm / m, and the straightness is ≤0.1 mm / m; the vertical arrangement of the quartz glass tube 11 can be performed by vertically fixing the quartz glass tube 11 on a bracket;

[0071] Step 2: insert the thin-walled tube 2 to be solid-solution-treated into the quartz glass tube 11, sleeve the upper quartz glass tube end plug 12 on the thin-walled tube 2 to be solid-solution-treated and then install it on the upper part of the quartz glass tube 11, sleeve the lower quartz glass tube end plug 13 on the thin-walled tube 2 to be solid-solution-treated and then install it on the lower part of the quartz glass tube 11; the length of the thin-walled tube 2 to be solid-solution-treated that exceeds the upper quartz glass tube end plug 12 is substantially the same as the length of the thin-walled tube 2 to be solid-solution-treated that exceeds the lower quartz glass tube end plug 13. The size of the thin-walled tube 2 to be solid-solution is Φ60×0.55×L (mm); the lower quartz glass tube end plug 13 is installed at the lower part of the quartz glass tube 11 by fixing the bracket or using the friction between the lower quartz glass tube end plug 13 and the inner wall of the quartz glass tube 11 to prevent the lower quartz glass tube end plug 13 from falling off; the thin-walled tube 2 to be solid-solution is a niobium alloy tube to be solid-solution glass tube;

[0072] Step 3, install the upper ventilation pipe 31 on the upper end plug 32, install the upper end plug 32 equipped with the upper ventilation pipe 31 on the upper part of the thin-walled tube 2 to be solid-solutionized, clamp the upper fixing chuck 33 on the upper part of the thin-walled tube 2 to be solid-solutionized, and connect the upper fixing chuck 33 to a constant current source, the constant current is 1450A;

[0073] Step 4: Install the lower ventilation pipe 41 on the lower end plug 42, install the lower end plug 42 equipped with the lower ventilation pipe 41 on the lower part of the thin-walled tube 2 to be solid-solutionized, and clamp the lower fixing chuck 43 on the lower part of the thin-walled tube 2 to be solid-solutionized; the lower fixing chuck 43 is connected to the constant current source;

[0074] Step 5, install a 100kg weight 5 on the lower fixed chuck 43; the weight 5 mass ≤ 80% of the minimum yield strength, the minimum yield strength is the minimum yield strength of the thin-walled tube 2 to be solid-solutionized at the corresponding solid solution temperature, the minimum yield strength is determined by a short-time high-temperature tensile test, and the reference standard is GB / T 228.2; the weight 5 can be installed on the lower fixed chuck 43 by a bolt and nut assembly;

[0075] Step 6: Pass a protective gas into the thin-walled tube 2 to be solid-solutionized through the lower ventilation pipe 41, and the protective gas entering the thin-walled tube 2 to be solid-solutionized is discharged from the upper ventilation pipe 31 to discharge the air in the thin-walled tube 2 to be solid-solutionized, and pass a protective gas into the quartz glass tube 11 through the lower quartz glass port 15, and the protective gas entering the quartz glass tube 11 is discharged from the upper quartz glass port 14 to discharge the air in the quartz glass tube 11; the protective gas is argon gas;

[0076] Step 7, under the condition of continuous introduction of protective gas, start the constant current source power supply, perform electric solution heat treatment on the thin-walled tube 2 to be treated, monitor the temperature in real time, and cut off the power when the solution temperature is reached. At the same time, increase the gas flow of the upper ventilation pipe 31 for gas quenching cooling; the solution temperature is 1150°C; the solution temperature is reached by testing through an infrared temperature measuring device arranged at the upper quartz glass port 14; the increased gas flow rate can be not less than 25L / min, and the pressure is 0.25 MPa;

[0077] Step 8: After cooling, the thin-walled tube is disassembled according to the clamping order. The part beyond the quartz glass tube 11 is the part that is not effectively dissolved. The part that is not effectively dissolved is cut off to obtain a thin-walled tube after heat treatment. The cross-sectional area of ​​the thin-walled tube after heat treatment is 102.7 mm 2 ; The measured grain size of the thin-walled tube head, middle and tail after heat treatment is 9.0, with a range of 0.5;

[0078] Step nine, straightening the heat-treated thin-walled tube, wherein the straightness of the thin-walled tube after straightening is ≤0.02 mm / m, the outer diameter deviation of the through root is 0.01 mm, and the roundness is ≤0.015 mm.

[0079] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment according to the technical essence of the invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A vertical heat treatment assembly for heat treatment of thin-walled tubes, characterized in that: The invention comprises a quartz glass component, a thin-walled tube plug, a weight (5) and a constant current source; the quartz glass component comprises a quartz glass tube (11), an upper quartz glass tube end plug (12), a lower quartz glass tube end plug (13), an upper quartz glass port (14) and a lower quartz glass port (15); the upper quartz glass tube end plug (12) and the lower quartz glass tube end plug (13) are detachably mounted on both ends of the quartz glass tube (11); the upper quartz glass port (14) is opened on the upper side of the quartz glass tube (11); the lower quartz glass port (15) is provided The thin-walled tube plug comprises an upper vent pipe (31), an upper end plug (32), an upper fixing chuck (33), a lower vent pipe (41), a lower end plug (42) and a lower fixing chuck (43); the upper vent pipe (31) is detachably mounted in the upper end plug (32), and the lower vent pipe (41) is detachably mounted in the lower end plug (42); the weight (5) is detachably mounted on the lower fixing chuck (43); the verticality of the quartz glass tube (11) is ≤0.02 mm / m, and the straightness is ≤0.1 mm / m.

2. A vertical heat treatment assembly for heat treatment of thin-walled tubes according to claim 1, characterized in that: The upper quartz glass tube end plug (12) and the lower quartz glass tube end plug (13) are both provided with openings through which the thin-walled tube (2) to be solid-solutionized can pass.

3. A method for vertical heat treatment using the vertical heat treatment assembly for heat treatment of thin-walled tubes according to claim 1, characterized in that: include: Step 1, vertically arranging the quartz glass tube (11); Step 2: insert the thin-walled tube (2) to be solid-solution-treated into the quartz glass tube (11), sleeve the upper quartz glass tube end plug (12) onto the thin-walled tube (2) to be solid-solution-treated and then install it on the upper part of the quartz glass tube (11), sleeve the lower quartz glass tube end plug (13) onto the thin-walled tube (2) to be solid-solution-treated and then install it on the lower part of the quartz glass tube (11); Step 3: Install the upper ventilation pipe (31) on the upper end plug (32), install the upper end plug (32) equipped with the upper ventilation pipe (31) on the upper part of the thin-walled tube (2) to be solid-solutionized, clamp the upper fixing chuck (33) on the upper part of the thin-walled tube (2) to be solid-solutionized, and connect the upper fixing chuck (33) to a constant current source; Step 4: Install the lower ventilation pipe (41) on the lower end plug (42), install the lower end plug (42) equipped with the lower ventilation pipe (41) on the lower part of the thin-walled tube (2) to be solid-solutionized, clamp the lower fixing chuck (43) on the lower part of the thin-walled tube (2) to be solid-solutionized, and connect the lower fixing chuck (43) to the constant current source; Step 5: Install the weight (5) on the lower fixing clamp (43); Step 6: introducing protective gas into the thin-walled tube (2) to be solid-solution treated through the lower ventilation pipe (41), and the protective gas entering the thin-walled tube (2) to be solid-solution treated is discharged from the upper ventilation pipe (31) to discharge the air in the thin-walled tube (2) to be solid-solution treated, introducing protective gas into the quartz glass tube (11) through the lower quartz glass port (15), and the protective gas entering the quartz glass tube (11) is discharged from the upper quartz glass port (14) to discharge the air in the quartz glass tube (11); Step 7: Under the condition of continuous introduction of protective gas, start the constant current source power supply, perform electric solution heat treatment on the thin-walled tube (2) to be treated, monitor the temperature in real time, and cut off the power when the solution temperature is reached. At the same time, increase the gas flow rate of the upper ventilation pipe (31) to perform gas quenching cooling; Step 8: After cooling, the thin-walled tube is disassembled. The portion beyond the quartz glass tube (11) is the portion that is not effectively dissolved. The portion that is not effectively dissolved is cut off to obtain the thin-walled tube after heat treatment.

4. The method according to claim 3, characterized in that In step 2, the size of the thin-walled tube (2) to be solid-solution treated is Φ(10-60)×(0.08-0.55)×L(mm).

5. The method according to claim 3, characterized in that: In step three, the constant current of the constant current source is 40A to 1450A.

6. The method according to claim 3, characterized in that In step 5, the mass of the weight (5) is ≤80% of the minimum yield strength, and the minimum yield strength is the minimum yield strength of the thin-walled tube (2) to be solid-solutionized at the solution temperature.

7. The method according to claim 3, characterized in that In step six, the protective gas is argon or nitrogen.

8. The method according to claim 3, characterized in that In step 1, the thin-walled tube (2) to be solid-solutionized is a stainless steel glass tube to be solid-solutionized. In step 7, the solid-solution temperature is 1000° C. to 1150° C.

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