Low-expansion alloy wire and preparation method thereof
阅读说明：本技术 一种低膨胀合金线材及其制备方法 (Low-expansion alloy wire and preparation method thereof ) 是由 张瑞 周子荐 崔传勇 周亦胄 孙晓峰 于 2020-07-27 设计创作，主要内容包括：本发明是关于一种低膨胀合金线材及其制备方法,涉及低膨胀合金技术领域。主要采用的技术方案为：一种低膨胀合金线材的制备方法,其包括在线退火、连续拉拔步骤：使低膨胀合金线坯行进且在行进过程中依次经过第一在线退火装置、第一冷却器、拉拔装置、第二在线退火装置,以对低膨胀合金线坯进行再结晶退火处理、冷却处理、连续拉拔处理、光亮退火处理,得到低膨胀合金线材。本发明可以实现低膨胀合金的在线退火并连续拉拔的短流程加工工艺,从而缩短低膨胀合金线材的生产周期,减少操作人员,且操作方便,在保持线材低热膨胀系数的同时,提高了生产效率,降低了生产成本。(The invention relates to a low-expansion alloy wire and a preparation method thereof, relating to the technical field of low-expansion alloys. The main technical scheme adopted is as follows: a preparation method of a low expansion alloy wire rod comprises the steps of on-line annealing and continuous drawing: and enabling the low-expansion alloy wire blank to advance and sequentially pass through a first online annealing device, a first cooler, a drawing device and a second online annealing device in the advancing process so as to perform recrystallization annealing treatment, cooling treatment, continuous drawing treatment and bright annealing treatment on the low-expansion alloy wire blank, thereby obtaining the low-expansion alloy wire. The invention can realize the short-flow processing technology of on-line annealing and continuous drawing of the low-expansion alloy, thereby shortening the production period of the low-expansion alloy wire rod, reducing the operators, having convenient operation, improving the production efficiency and reducing the production cost while keeping the low thermal expansion coefficient of the wire rod.)
1. The preparation method of the low-expansion alloy wire is characterized by comprising the following steps of:
online annealing and continuous drawing: and enabling the low-expansion alloy wire blank to advance and sequentially pass through a first online annealing device, a first cooler, a drawing device and a second online annealing device in the advancing process so as to perform recrystallization annealing treatment, cooling treatment, continuous drawing treatment and bright annealing treatment on the low-expansion alloy wire blank, thereby obtaining the low-expansion alloy wire.
2. The method for producing a low expansion alloy wire according to claim 1,
the low-expansion alloy wire blank is a hot-rolled wire rod; preferably, the diameter of the hot rolled wire rod is 5-10 mm; and/or
The diameter of the low-expansion alloy wire rod is 1-3 mm.
3. The preparation method of the low expansion alloy wire rod as claimed in claim 1 or 2, wherein the low expansion alloy wire blank is automatically heated to 1050-1200 ℃ by cutting the magnetic induction wire generated by the magnetic induction coil in the first online annealing device during the advancing process so as to perform recrystallization annealing treatment;
preferably, the traveling speed of the low-expansion alloy wire blank in the first online annealing device is 0.1-1 m/min;
preferably, the time of the recrystallization annealing treatment is 10-30 min;
preferably, the first online annealing device comprises a heat insulation sleeve, a magnetic induction coil and an induction power supply; wherein the induction power supply is connected with the magnetic induction coil; the magnetic induction coil is sleeved on the heat-insulating sleeve; the heat-insulating sleeve is provided with a heat-insulating channel for enabling the low-expansion alloy wire blank to pass through the first online annealing device;
further preferably, the heat preservation channel is a vacuum channel; or the heat preservation channel is connected with a gas conveying pipeline so as to introduce inert gas or reducing gas into the heat preservation channel;
further preferably, the first online annealing device further comprises a temperature measuring instrument and a temperature sensor; wherein the temperature sensor is installed in the heat preservation channel; the temperature measuring instrument is positioned outside the heat insulation sleeve and is connected with the temperature sensor.
4. The production method of a low-expansion alloy wire rod as recited in claim 3, wherein the first cooler is provided with a cooling passage for passing the low-expansion alloy wire blank through the first cooler; wherein the content of the first and second substances,
the cooling channel is communicated with the heat preservation channel of the first online annealing device through a sealing channel;
preferably, the channel wall of the sealing channel is made of high-temperature-resistant glass.
5. The production method of a low expansion alloy wire according to claim 1 or 2, characterized in that, in the step of subjecting the low expansion alloy wire blank to a continuous drawing process:
the processing rate of each pass of drawing is 15-30%; and/or
The drawing speed is 1-10 m/min.
6. The method for preparing the low-expansion alloy wire rod as claimed in claim 1 or 2, wherein the low-expansion alloy wire blank after the continuous drawing treatment is automatically heated to 600-900 ℃ by cutting the magnetic induction line generated by the magnetic induction coil in the second online annealing device in the advancing process so as to carry out bright annealing treatment;
preferably, a heat preservation channel for enabling the low-expansion alloy wire blank to pass through in the second in-line annealing device is filled with reducing gas;
preferably, the time of the bright annealing treatment is 5-15 min.
7. The method for producing a low expansion alloy wire according to any one of claims 1 to 6, wherein the first in-line annealing apparatus, the first cooler, the drawing apparatus, and the second in-line annealing apparatus are mounted on a support platform;
preferably, a first winder is arranged upstream of the first online annealing device and used for installing a low-expansion alloy wire blank coil;
preferably, a second winder set is arranged between the first cooler and the drawing device and used for adjusting the advancing speed of the low-expansion alloy wire blank passing through the first online annealing device;
preferably, a third winder set is arranged between the drawing device and the second online annealing device and used for adjusting the advancing speed of the low-expansion alloy wire blank passing through the drawing device;
preferably, a second cooler is further arranged at the downstream of the second in-line annealing device and used for cooling the low-expansion alloy wire;
preferably, a fourth winding machine is arranged at the downstream of the second cooler and used for adjusting the advancing speed of the low-expansion alloy wire blank subjected to continuous drawing processing when passing through the second online annealing device and winding finished wire materials;
preferably, the drawing means comprises a drawing die; the device comprises a drawing die, a pushing head device, a clamping device and a clamping device, wherein the upstream end and the downstream end of the drawing die are both provided with the pushing head device, and the clamping device is arranged between the pushing head device and the drawing die.
8. The method for producing a low expansion alloy wire according to any one of claims 1 to 7, further comprising: a step of preparing a low expansion alloy wire blank, wherein the step of preparing the low expansion alloy wire blank comprises:
1) smelting and casting the raw materials to obtain a low-expansion alloy cast ingot; wherein the raw materials comprise the following components in percentage by weight: 0 to 4.2 percent of Co, 0.1 to 0.5 percent of Mo, 0.15 to 0.3 percent of Si, 0.2 to 0.6 percent of Mn, 32 to 36 percent of Ni, and the balance of Fe and inevitable impurities;
2) carrying out electroslag remelting treatment on the low-expansion alloy ingot to obtain an electroslag remelting ingot;
3) forging the electroslag remelting ingot into a low-expansion alloy bar blank;
4) and carrying out hot rolling treatment on the low-expansion alloy bar billet to obtain a hot-rolled wire rod serving as a low-expansion alloy wire billet.
9. The method for producing a low expansion alloy wire according to claim 8,
the step 3) comprises the following steps: heating the electroslag remelting ingot to 1150-1200 ℃ under a protective atmosphere, preserving heat for 2-6h, then forging, and forging into a low-expansion alloy bar blank with the diameter of 60-80 mm; wherein the finish forging temperature is more than 1050 ℃; and/or
The step 4) comprises the following steps: performing multi-pass hot rolling on the low-expansion alloy bar blank on a rolling mill to obtain a low-expansion alloy wire blank; preferably, the initial rolling temperature is 1100-1150 ℃, and the final rolling temperature is 850-900 ℃; preferably, the low expansion alloy rod is subjected to surface grinding treatment before hot rolling.
10. A low-expansion alloy wire rod, characterized in that the low-expansion alloy wire rod is produced by the production method of the low-expansion alloy wire rod according to any one of claims 1 to 9;
preferably, the tensile strength of the low-expansion alloy wire rod is more than 540 MPa; the yield strength of the low-expansion alloy wire reaches more than 250 MPa; the linear expansion coefficient of the low-expansion alloy wire rod is not more than 1.5 multiplied by 10 in the temperature range of-160 to 25 DEG C-6/℃。
Technical Field
The invention relates to the technical field of low-expansion alloy, in particular to a low-expansion alloy wire and a preparation method thereof.
Background
The low expansion alloy has very low thermal expansion coefficient (at room temperature, the thermal expansion coefficient of the low expansion alloy is one tenth of that of common steel), and is particularly suitable for manufacturing precision parts and the like. Therefore, the low expansion alloy is widely used in the industrial fields of aerospace, precision instruments and meters, high voltage transmission lines and the like. However, the lower strength also limits the range of applications; the low expansion alloy keeps a single-phase austenite structure in a wide temperature range, so that the room temperature strength is lower (Re is less than or equal to 240MPa, Rm is less than or equal to 500MPa), and the potential application of the low expansion characteristic to structural material members is limited. Because of the lower room temperature tensile strength, the low expansion alloy can only be used as a functional material for a long time and is difficult to bear the performance requirement of the function of a structural material.
At present, in the preparation process of low expansion alloy wires, a vacuum heat treatment furnace is adopted for annealing; specifically, the drawn bar is placed in a heat treatment furnace for heat preservation for a period of time and then cooled. The whole process comprises the working procedures of charging, heating, heat preservation, discharging and the like, and the heat treatment time of each furnace is about 10-15 hours. In addition, the bar needs about ten furnaces of intermediate annealing in the drawing process, so that the total time of multiple annealing is very long, the production period of the low-expansion alloy wire is long, and the production efficiency is reduced.
Therefore, a process for preparing a low-expansion alloy wire rod capable of shortening the annealing time is needed to improve the production efficiency and reduce the production cost while maintaining the low linear expansion coefficient of the wire rod.
Disclosure of Invention
In view of the above, the present invention provides a low expansion alloy wire and a method for manufacturing the same, and the main object is to shorten the production cycle of the low expansion alloy wire and improve the production efficiency while maintaining the low linear expansion coefficient of the wire.
In order to achieve the purpose, the invention mainly provides the following technical scheme:
in one aspect, an embodiment of the present invention provides a method for preparing a low expansion alloy wire, including the following steps:
online annealing and continuous drawing: and enabling the low-expansion alloy wire blank to advance and sequentially pass through a first online annealing device, a first cooler, a drawing device and a second online annealing device in the advancing process so as to perform recrystallization annealing treatment, cooling treatment, continuous drawing treatment and bright annealing treatment on the low-expansion alloy wire blank, thereby obtaining the low-expansion alloy wire.
Preferably, the low expansion alloy wire blank is a hot rolled wire rod; preferably, the diameter of the hot rolled wire rod is 5 to 10 mm.
Preferably, the diameter of the low expansion alloy wire is 1 to 3 mm.
Preferably, in the advancing process of the low-expansion alloy wire blank, the temperature is automatically raised to 1050-; preferably, the traveling speed of the low-expansion alloy wire blank in the first online annealing device is 0.1-1 m/min; preferably, the time of the recrystallization annealing treatment is 10-30 min; preferably, the first online annealing device comprises a heat insulation sleeve, a magnetic induction coil and an induction power supply; wherein the induction power supply is connected with the magnetic induction coil; the magnetic induction coil is sleeved on the heat-insulating sleeve; the heat-insulating sleeve is provided with a heat-insulating channel for enabling the low-expansion alloy wire blank to pass through the first online annealing device; further preferably, the heat preservation channel is a vacuum channel; or the heat preservation channel is connected with a gas conveying pipeline so as to introduce inert gas or reducing gas into the heat preservation channel; further preferably, the first online annealing device further comprises a temperature measuring instrument and a temperature sensor; wherein the temperature sensor is installed in the heat preservation channel; the temperature measuring instrument is positioned outside the heat insulation sleeve and is connected with the temperature sensor.
Preferably, the first cooler is provided with a cooling channel for passing the low expansion alloy wire blank through the first cooler; the cooling channel is communicated with the heat preservation channel of the first online annealing device through a sealing channel; preferably, the channel wall of the sealing channel is made of high-temperature-resistant glass.
Preferably, in the step of performing the continuous drawing process on the low expansion alloy wire blank: the processing rate of each pass of drawing is 15-30%; and/or the drawing speed is 1-10 m/min.
Preferably, in the advancing process of the low-expansion alloy wire blank subjected to continuous drawing treatment, the temperature is automatically increased to 600-900 ℃ by cutting a magnetic induction wire generated by a magnetic induction coil in the second online annealing device so as to perform bright annealing treatment; preferably, a heat preservation channel for enabling the low-expansion alloy wire blank to pass through in the second in-line annealing device is filled with reducing gas; preferably, the time of the bright annealing treatment is 5-15 min.
Preferably, the first online annealing device, the first cooler, the drawing device and the second online annealing device are all arranged on a supporting platform; preferably, a first winder is arranged at the upstream of the first online annealing device and used for installing low-expansion alloy wire blank coils (hot-rolled coil coils); preferably, a second winder set is arranged between the first cooler and the drawing device and used for adjusting the advancing speed of the low-expansion alloy wire blank passing through the first online annealing device; preferably, a third winder set is arranged between the drawing device and the second online annealing device and used for adjusting the advancing speed of the low-expansion alloy wire blank passing through the drawing device; preferably, a fourth winding machine is arranged at the downstream of the second cooler and used for adjusting the advancing speed of the low-expansion alloy wire blank subjected to continuous drawing processing when passing through the second online annealing device and winding finished wire materials; preferably, the drawing means comprises a drawing die; the device comprises a drawing die, a pushing head device, a clamping device and a clamping device, wherein the upstream end and the downstream end of the drawing die are both provided with the pushing head device, and the clamping device is arranged between the pushing head device and the drawing die.
Preferably, a second cooler is further arranged at the downstream of the second in-line annealing device and used for cooling the low-expansion alloy wire.
Preferably, the method for preparing the low expansion alloy wire further comprises: a step of preparing a low expansion alloy wire blank, wherein the step of preparing the low expansion alloy wire blank comprises:
1) smelting and casting the raw materials to obtain a low-expansion alloy cast ingot; wherein the raw materials comprise the following components in percentage by weight: 0 to 4.2 percent of Co, 0.1 to 0.5 percent of Mo, 0.15 to 0.3 percent of Si, 0.2 to 0.6 percent of Mn, 32 to 36 percent of Ni, and the balance of Fe and inevitable impurities;
2) carrying out electroslag remelting treatment on the low-expansion alloy ingot to obtain an electroslag remelting ingot;
3) forging the electroslag remelting ingot into a low-expansion alloy bar blank;
4) and carrying out hot rolling treatment on the low-expansion alloy bar billet to obtain a hot-rolled wire rod serving as a low-expansion alloy wire billet.
Preferably, the step 3) includes: heating the electroslag remelting ingot to 1150-1200 ℃ under a protective atmosphere, preserving heat for 2-6h, then forging, and forging into a low-expansion alloy bar blank with the diameter of 60-80 mm; wherein the finish forging temperature is more than 1050 ℃.
Preferably, the step 4) includes: performing multi-pass hot rolling on the low-expansion alloy bar blank on a rolling mill to obtain a low-expansion alloy wire blank; preferably, the initial rolling temperature is 1100-1150 ℃, and the final rolling temperature is 850-900 ℃; preferably, the low expansion alloy rod is subjected to surface grinding treatment before hot rolling.
In another aspect, an embodiment of the present invention provides a low expansion alloy wire rod, wherein the low expansion alloy wire rod is prepared by any one of the methods for preparing the low expansion alloy wire rod.
Preferably, the tensile strength of the low-expansion alloy wire rod is more than 540 MPa; the yield strength of the low-expansion alloy wire reaches more than 250 MPa; the linear expansion coefficient of the low-expansion alloy wire rod is not more than 1.5 multiplied by 10 in the temperature range of-160 to 25 DEG C-6/℃。
Compared with the prior art, the low-expansion alloy wire and the preparation method thereof have the following beneficial effects:
the preparation method of the low-expansion alloy wire rod provided by the invention comprises the steps of enabling a low-expansion alloy wire blank to sequentially pass through a first online annealing device, a cooler, a drawing device and a second online annealing device in the advancing process so as to carry out recrystallization annealing treatment, cooling treatment, continuous drawing treatment and bright annealing treatment, thus obtaining the low-expansion alloy wire rod; on one hand, the process realizes continuous on-line annealing and continuous drawing of the low-expansion alloy wire blank, thereby shortening the production period, reducing the production cost and improving the production efficiency; on the other hand, in the process, the recrystallization annealing treatment and the bright annealing treatment are respectively carried out before and after the continuous drawing treatment (the bright annealing treatment enables the wire rod manufactured by drawing to be completely recrystallized, so that the recrystallized grains are not easy to grow up at low temperature, the alloy strength is improved, and the low expansion performance of the alloy is ensured), and the low thermal expansion coefficient and the strength of the wire rod can be ensured.
Further, the raw materials for preparing the low-expansion alloy wire rod comprise the following components in percentage by weight: 0 to 4.2 percent of Co, 0.1 to 0.5 percent of Mo, 0.15 to 0.3 percent of Si, 0.2 to 0.6 percent of Mn, 32 to 36 percent of Ni, and the balance of Fe and inevitable impurities (such as C, S, P and the like); the raw materials are not added with any alloy element, and the low expansion performance of the alloy can be protected to the maximum extent through the raw material formula.
In conclusion, the invention solves the problems of long total time and low efficiency of multiple annealing required in the drawing process of the low-expansion alloy wire in the prior art; the method provided by the invention realizes short-flow preparation of the low-expansion alloy and is convenient to operate, so that the production cost is obviously reduced and the production efficiency is improved. The preparation method of the low-expansion alloy wire rod provided by the invention adopts an electromagnetic induction heating mode to carry out on-line annealing, has high heating speed, saves a partial uncoiling and coiling device, saves the workshop area and makes up the defects of the existing production mode of the low-expansion alloy wire rod.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of an in-line annealing, continuous drawing apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a first in-line annealing apparatus according to an embodiment of the present invention;
FIG. 3 is a metallographic structure diagram of a low expansion alloy wire sample obtained in example 1;
FIG. 4 is a metallographic structure of a sample of a low-expansion alloy wire obtained in example 2;
FIG. 5 is a metallographic structure of a sample of a low-expansion alloy wire obtained in example 3;
FIG. 6 is a metallographic structure diagram of a low-expansion alloy wire sample obtained in example 4.
Detailed Description
To further explain the technical means and effects of the present invention adopted to achieve the predetermined object, the following detailed description of the embodiments, structures, features and effects according to the present invention will be made with reference to the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "an embodiment" refers to not necessarily the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
The invention provides a preparation method of a low-expansion alloy wire rod, which aims to realize the purposes of shortening the production period, reducing the production cost and improving the production efficiency on the premise of keeping the low thermal expansion coefficient of the low-expansion alloy wire rod (generally testing the linear expansion coefficient of the wire rod to show the thermal expansion coefficient of the wire rod by a person skilled in the art), and specifically comprises the following steps:
1. step of preparing low expansion alloy wire blank
The method specifically comprises the following steps:
11) smelting the raw materials in a vacuum induction smelting furnace, and casting into a low-expansion alloy cast ingot; wherein, by weight percentage, the raw materials include: 0 to 4.2 percent of Co, 0.1 to 0.5 percent of Mo, 0.15 to 0.3 percent of Si, 0.2 to 0.6 percent of Mn, 32 to 36 percent of Ni, and the balance of Fe and inevitable impurities. The raw material components contain a small amount of impurity elements such as C, S, P and the like, and no alloying element is added, so that the low expansion performance of the alloy is protected to the maximum extent.
12) And carrying out electroslag remelting on the low-expansion alloy ingot to obtain an electroslag remelting ingot.
Because the components of the alloy raw materials lack oxidation resistance elements, the intergranular oxidation is serious, the alloy can be ensured not to be oxidized by the protective atmosphere of argon, the intergranular oxidation of the alloy is effectively avoided in the process of removing nitrogen, the generation of cracks in the rolling process is reduced, the crystal grains can have enough recrystallization driving force in the subsequent thermal deformation process, the recrystallization process is favorably carried out, and the generation of cracks in the subsequent thermal deformation process is reduced.
13) Heating the electroslag remelting ingot to 1150-1200 ℃, preserving heat for 2-6h, then forging to obtain a bar blank with phi of 60-80mm, wherein the final forging temperature is higher than 1050 ℃.
The step can ensure that the crystal grains are always in the recrystallization temperature range in the alloy deformation process, is beneficial to the recrystallization process and reduces the generation of cracks in the rolling process.
14) After the surface of the bar blank is polished, the bar blank is hot rolled on a rolling mill for multiple times to form an alloy wire rod with phi 5-10mm (the alloy wire rod is used as a low-expansion alloy wire blank), wherein the initial rolling temperature is 1100-1150 ℃ and the final rolling temperature is 850-900 ℃.
2. In-line annealing and continuous drawing steps
The step mainly realizes the continuous on-line annealing and continuous drawing of the low-expansion alloy wire blank.
The method comprises the following steps: and enabling the low-expansion alloy wire blank to advance and sequentially pass through a first online annealing device, a first cooler, a drawing device and a second online annealing device in the advancing process so as to perform recrystallization annealing treatment, cooling treatment, continuous drawing treatment and bright annealing treatment on the low-expansion alloy wire blank, thereby obtaining the low-expansion alloy wire.
The method comprises the following specific steps:
recrystallization annealing treatment: the heat preservation channel in the first online annealing device is vacuum (realized by connecting the heat preservation channel with a vacuum pumping system) or filled with protective gas (such as inert gas or reducing gas, realized by connecting the heat preservation channel with a gas conveying pipeline); the low-expansion alloy wire blank (alloy wire rod) advances in a heat insulation channel of the first online annealing device, and is subjected to automatic temperature rise by cutting a magnetic induction wire of a magnetic induction coil, and is rapidly heated to 1050-. Wherein the time of the recrystallization annealing treatment is 10-30min (i.e., the residence time of the wire blank in the first in-line annealing device).
The principle of the online annealing is as follows: referring to fig. 2, an alternating current generated by an
Cooling treatment: after the recrystallization annealing treatment, the low-expansion alloy wire blank enters a first cooler for rapid cooling.
And (3) continuous drawing treatment: the cooled low-expansion alloy wire blank enters a drawing die for continuous drawing; and repeatedly carrying out on-line drawing for many times to draw the diameter of the low-expansion alloy wire blank to 1-3 mm.
Bright annealing treatment: and heating the wire rod (the low-expansion alloy wire blank with the diameter of 1-3 mm) obtained by continuous drawing to 900 ℃ for continuous bright annealing, and keeping the temperature for 5-15min to obtain the low-expansion alloy wire rod.
In this case, the bright annealing treatment is based on the principle of the in-line annealing treatment described above, and is mainly different from the recrystallization annealing treatment in that: the annealing temperature and the annealing time are different. The bright annealing treatment is carried out in a reducing atmosphere.
And finally, quickly cooling the low-expansion alloy wire to room temperature, and then rolling.
Further, the in-line annealing and continuous drawing step was performed by using the in-line annealing and continuous drawing apparatus shown in fig. 1. As shown in fig. 1, the on-line annealing and continuous drawing apparatus includes: the device comprises a supporting platform 1, a first online annealing device 2, a
Preferably, as shown in fig. 2, the first in-line annealing device 2 comprises a
And a coil body surrounded by the magnetic induction coil in the first online annealing device is vertical to the advancing direction of the alloy wire rod.
Preferably, as shown in fig. 1, the
Preferably, as shown in fig. 1, said drawing means 4 comprise a
For the design of the second in-line annealing device 5, see the design of the first in-line annealing device 2, as shown in fig. 1.
Preferably, as shown in fig. 1, a
Preferably, as shown in fig. 1, winding machines with different diameters are arranged between the processes, so that speed regulation and control between each process are realized. And a first winder 6 is arranged at the upstream of the first online annealing device 2 and used for installing the low-expansion alloy wire blank coil. A second winder unit 7 (a unit consisting of two winders) is arranged downstream of the first in-line annealing apparatus 2 and is used for adjusting the traveling speed of the low-expansion alloy wire blank when passing through the first in-line annealing apparatus 2 (the upstream and the downstream mentioned in the invention are determined according to the traveling direction of the wire blank). A third winder set 8 (the winder set is composed of two winders) is arranged between the drawing device 4 and the second online annealing device 5 and is used for adjusting the advancing speed of the low-expansion alloy wire blank passing through the drawing device. Preferably, a fourth winder 9 is provided downstream of the
The steps of online annealing and continuous drawing realize the synchronous operation of the steps of online annealing and continuous drawing in the advancing process of the low-expansion alloy wire blank.
The invention is further illustrated by the following specific examples:
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