CN111515248A - Vacuum electric rolling device and method for online adjusting roughness of iron-based amorphous strip - Google Patents
Vacuum electric rolling device and method for online adjusting roughness of iron-based amorphous strip Download PDFInfo
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- CN111515248A CN111515248A CN202010336218.XA CN202010336218A CN111515248A CN 111515248 A CN111515248 A CN 111515248A CN 202010336218 A CN202010336218 A CN 202010336218A CN 111515248 A CN111515248 A CN 111515248A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B9/00—Measures for carrying out rolling operations under special conditions, e.g. in vacuum or inert atmosphere to prevent oxidation of work; Special measures for removing fumes from rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B2001/228—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length skin pass rolling or temper rolling
Abstract
The invention relates to a vacuum electric rolling device for adjusting the roughness of an iron-based amorphous strip on line and a method thereof. According to the method, the iron-based amorphous strip is subjected to continuous temperature control rolling in a vacuum environment, so that the plasticity and the ductility of the iron-based amorphous strip can be improved, the internal residual stress and local strain of the iron-based amorphous strip can be adjusted, the rolling pressure is reduced, and the like; the skin effect generated by the variable frequency current is utilized to effectively soften the burrs on the surface of the iron-based amorphous strip, and the surface roughness of the iron-based amorphous strip can be efficiently reduced.
Description
Technical Field
The invention relates to the technical field of special metal material mechanical manufacturing, in particular to a vacuum electric rolling device and a vacuum electric rolling method for online adjusting the roughness of an iron-based amorphous strip.
Background
The iron-based amorphous alloy strip has high strength and hardness, excellent corrosion resistance and wear resistance and good magnetic property, and is widely applied to various fields of distribution transformers, machinery, chemical engineering, aerospace and the like. However, due to the manufacturing method of the iron-based amorphous strip, the roughness of two surfaces (a free surface and a roll attaching surface) of the iron-based amorphous strip at present is greatly different, the size of a pit of the roll attaching surface of the iron-based amorphous strip is obviously larger than that of a pit of the free surface, and the iron-based amorphous strip has the characteristics of high hardness, brittleness and difficult deformation at room temperature. Therefore, advanced plasticization theory and means are required to be introduced for the product, and a novel plastic processing device is adopted to reduce the surface roughness of the iron-based amorphous strip and meet the industrial requirements of precision, high quality and high efficiency.
The rolling is a very efficient processing means, the surface quality of a rolled strip is improved by copying the surface appearance of a roller surface, but the traditional rolling method is difficult to directly apply aiming at the high-brittleness and high-hardness iron-based amorphous alloy, and the special performance of the iron-based amorphous strip and the plasticizing theory of the rolling need to be combined.
The iron-based amorphous alloy has excellent performances such as ultrahigh strength, hardness, excellent corrosion resistance and wear resistance, has good application potential in high-end fields such as aerospace, weapon manufacturing, micromachine and ornaments, but is not very common in daily life, because the iron-based amorphous alloy has room temperature brittleness, the forming and processing are very difficult, and the application of the iron-based amorphous alloy in the conventional industry is seriously hindered. However, the iron-based amorphous ribbon alloy has a supercooled liquid phase region, namely a glass transition temperature and crystallization temperature region, and has the characteristic of excellent deformability in the temperature region, and an appropriate deformation process is designed for the iron-based amorphous ribbon alloy, so that the iron-based amorphous ribbon alloy can generate superplastic deformation to achieve precise forming, and the problem of difficult machining of the iron-based amorphous alloy can be perfectly solved. Therefore, the method plays an important role in temperature control processing of the iron-based amorphous alloy.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a vacuum electric rolling apparatus and method for online adjusting the roughness of an iron-based amorphous ribbon, which can effectively solve the problems of difficult room temperature forming, low efficiency, poor surface precision and quality, etc.
The technical scheme adopted by the invention is as follows:
the invention provides a vacuum electric rolling device for online adjusting the roughness of an iron-based amorphous strip, which comprises a vacuum mechanism, tension mechanisms and electric rolling rollers, wherein the tension mechanisms are arranged on the left side and the right side in the vacuum mechanism and connected through tension belts, the electric rolling rollers are respectively arranged on the upper side and the lower side of each tension belt, driving rollers are respectively arranged on the outer sides of the electric rolling rollers, a variable frequency power supply is arranged on one side of each tension belt, a temperature control component connected with the variable frequency power supply is arranged on the other side of each tension belt, the positive electrode of the variable frequency power supply is connected with an electrode contact arranged on one side of each electric rolling roller, and the negative electrode of the variable frequency power supply is connected with the electrode contact.
Furthermore, the temperature control assembly comprises a temperature control system connected with the variable frequency power supply and temperature measuring blocks connected to two sides of the temperature control system, and the temperature measuring blocks are arranged on one side of the tension belt at certain intervals.
A vacuum electric rolling method for online adjusting the roughness of an iron-based amorphous strip comprises the following steps: s1, selecting an electric roller device meeting the roughness requirement on a four-roller mill; s2, mounting a group of tension mechanisms on two sides of the four-high mill to provide rolling tension for the iron-based amorphous strip; s3, passing the iron-based amorphous strip with the roughness required to be adjusted through a roller, loading the iron-based amorphous strip into a front and rear tension mechanism, and adjusting the rolling reduction; s4, connecting the temperature control assembly and the variable frequency power supply to corresponding positions; s5, vacuumizing the rolling environment through a vacuum mechanism to reach a vacuum state; s6, preheating the iron-based amorphous strip by using a temperature control system and a variable frequency power supply; s7, continuous temperature control rolling: forming a closed loop rolling of the preheated iron-based amorphous belt by a temperature control system, an electric roller, a variable frequency power supply and a vacuum mechanism; and S8, warehousing the finished product meeting the roughness requirement of the iron-based amorphous strip.
Further, in the step S3, the rolling reduction should be set between 10% and 15%.
Further, in the step S6, the preheating temperature is controlled at 380-440 ℃.
Further, in the step S7, the temperature during the continuous temperature-controlled rolling process is controlled at 480-540 ℃.
Compared with the prior art, the invention has the following beneficial effects:
according to the vacuum electric rolling device for adjusting the roughness of the iron-based amorphous strip on line, provided by the invention, the strip is prevented from being oxidized in a line changing process in a vacuum environment, meanwhile, a temperature control system is combined with a variable frequency power supply, the temperature of the strip is accurately displayed according to the temperature control system, variable frequency current parameters are accurately adjusted according to the temperature, and a specific and uniformly distributed temperature field is obtained by utilizing the current joule heating effect, so that the temperature of the iron-based amorphous strip is accurately positioned in a supercooled liquid region of the iron-based amorphous strip, and the iron-based amorphous strip has ultrahigh plasticity according to the characteristics of the iron-based amorphous strip, and the shape transfer rate of rolling is favorably improved; in addition, the current is introduced, and the pure electric effect is achieved, so that the plasticity and the ductility of the iron-based amorphous alloy can be improved, the internal residual stress and the local strain can be adjusted, the rolling pressure can be reduced, and the like; and the skin effect generated by the variable frequency current is utilized to effectively soften the burrs on the surface of the iron-based amorphous alloy strip, thereby providing a new technical means for efficiently reducing the surface roughness of the iron-based amorphous alloy strip so as to improve the surface precision and quality.
Drawings
FIG. 1 is a schematic view of the overall structure of an embodiment of a vacuum electric rolling apparatus for on-line adjusting the roughness of an iron-based amorphous strip according to the present invention;
FIG. 2 is a schematic flow chart of the working principle of the present invention;
FIG. 3 is a schematic structural view of an iron-based amorphous ribbon;
fig. 4 is a schematic of the glass transition and crystallization process of an iron-based amorphous ribbon.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
It should be noted that in the description of the present invention, the terms "upper", "lower", "top", "bottom", "one side", "the other side", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not mean that a device or an element must have a specific orientation, be configured and operated in a specific orientation.
Referring to fig. 1, a specific structure of an embodiment of a vacuum electric rolling device for on-line adjusting the roughness of an iron-based amorphous strip according to the present invention is shown. The device comprises a vacuum mechanism 1, a tension mechanism 2, an electric roller 3, a driving roller 4, a variable frequency power supply 5 and a temperature control assembly 6.
In this embodiment, the vacuum mechanism 1 adopts a vacuum box, the tension mechanisms 2 are provided with two groups, the two groups are respectively and fixedly installed on the left side and the right side inside the vacuum mechanism 1, the tension mechanisms 2 on the left side and the right side are connected through a tension belt 21, the electric rollers 3 are respectively and symmetrically installed on the upper side and the lower side of the middle part of the tension belt 21, the transmission rollers 4 are respectively connected to the outer sides of the electric rollers 3, the variable frequency power supply 5 is a high-energy pulse power supply, the variable frequency power supply 5 is installed on the upper side of the middle part of the tension belt 21, the anode of the variable frequency power supply 5 is connected with a first electrode contact 52 arranged on the left side of the electric roller 3 on the same side through a lead 51, the cathode of the variable frequency power supply 5 is connected with a second electrode contact 31 arranged on the electric roller 3 on the same side through a lead 51, the temperature control assembly 6 is installed on the lower side of the tension belt The temperature measuring blocks 63 are arranged on two sides below the tension belt 21 at certain intervals, and the temperature control system 61 is connected to the variable frequency power supply 5 and used for controlling current parameters of the variable frequency power supply 5.
The invention has the following function principle: because most of the existing manufacturing methods of the iron-based amorphous alloy strip are single-roller melt-spun quenching methods, the roughness of the roll-attaching surface 71 and the free surface 72 of the two surfaces of the iron-based amorphous strip 7 is greatly different, as shown in fig. 3, the size of the pit of the free surface 72 of the iron-based amorphous strip 7 is obviously larger than that of the roll-attaching surface 71, which is mainly related to the contact medium of the two surfaces in the cooling process and the strip manufacturing process. First, the roll-facing surface 71 is the surface formed by the high-temperature melt when contacting the cooling roll, and the surface quality is mainly determined by the surface quality of the cooling roll and the physical properties of the high-temperature melt, while the surface quality of the free surface 72 is mainly determined by the air flow around the high-temperature melt during the cooling process of the high-temperature melt and the physical properties thereof, so the object of the present invention is to improve the roughness of both surfaces of the iron-based amorphous strip 7 with high efficiency.
A vacuum electric rolling method for online adjusting the roughness of an iron-based amorphous strip specifically comprises the following steps:
s1, selecting an electric roller 3 and a driving roller 4 meeting the roughness requirement and arranging the electric roller and the driving roller in a four-roller mill;
s2, mounting a group of tension mechanisms 2 on two sides of the four-high mill to provide rolling tension for the iron-based amorphous strip 7;
s3, the iron-based amorphous strip 7 with the roughness needing to be adjusted passes through the electric roller 3 through the tension belt 21 and is loaded into the front and rear tension mechanisms 2, and the rolling reduction is adjusted; since the iron-based amorphous strip 7 is a high-brittleness hard alloy strip, the rolling reduction rate should be set to 10% -15%, preferably 12.5%;
s4, connecting a temperature control system 61 in the temperature control assembly 6 with a variable frequency power supply, connecting two temperature measuring blocks 63 with the temperature control system 61, placing the temperature measuring blocks at the front end and the rear end of one side of the iron-based amorphous strip 7, and respectively connecting the positive electrode and the negative electrode of the variable frequency power supply 5 to a first electrode contact 52 and a second electrode contact 31;
s5, vacuumizing the rolling environment through the vacuum mechanism 1 to reach a vacuum state; because the temperature of the iron-based amorphous strip 7 is higher in the temperature-controlled rolling process, the vacuum condition of the rolling process can be ensured by utilizing the vacuum mechanism 1, so that the influence of the external environment on the strip is reduced, and the phenomena of oxidation, heat exchange and the like are prevented;
s6, preheating the iron-based amorphous strip 7 by using the temperature control system 61 and the variable frequency power supply 5, wherein the preheating temperature is properly lower than the temperature of a supercooling liquid phase region of the iron-based amorphous strip 7 because heat is released in the rolling process, and is controlled at 380-440 ℃, preferably 410 ℃;
s7, continuous temperature control rolling: forming closed-loop rolling on the preheated iron-based amorphous strip by a temperature control system 61, an electric roller 3, a variable frequency power supply 5 and a vacuum mechanism 1, wherein the temperature in the rolling process is controlled to 480-540 ℃, and preferably 510 ℃;
and S8, warehousing the finished product meeting the roughness requirement of the iron-based amorphous strip.
As shown in the attached figure 2, when the invention works, firstly, the vacuum mechanism 10 evacuates the internal rolling space, so as to ensure that the internal rolling space is in a vacuum environment and prevent the oxidation of the iron-based amorphous strip 7 caused by temperature rise during rolling; when the iron-based amorphous strip 7 is rolled from left to right, a variable frequency power supply 5 provides high-energy continuous pulses, the anode and the cathode of the variable frequency power supply 5 are respectively connected to a first electrode contact 52 and a second electrode contact 31, and an electric contact device is insulated from a rolling mill part; the high-energy pulse current energizes the iron-based amorphous strip 7 through the electrode contact, the iron-based amorphous strip 7 obtains a specific and uniformly distributed temperature field by utilizing the Joule heating effect, and burrs on the surface of the iron-based amorphous strip are softened by the skin effect generated by the variable frequency current, so that the shape transfer rate during rolling is improved; with the change of the temperature of the iron-based amorphous strip 7, the temperature of the iron-based amorphous strip 7 is measured in real time through the temperature measuring block 63 and is transmitted to the temperature control system 61, the temperature control system 61 feeds the temperature back to the variable frequency power supply 5, and then the current parameters are automatically adjusted to control the temperature of the iron-based amorphous strip 7 to be placed in a supercooled liquid region, namely the range of 480-540 ℃, so that the closed-loop control of the current and the temperature is realized; the tension mechanism 2 can ensure that the iron-based amorphous strip 7 is uniformly and stably rolled, and further the surface roughness of the iron-based amorphous strip 7 is efficiently reduced.
As shown in FIG. 4, in contrast to the glass transition and crystallization process of the Fe-based amorphous ribbon 7, if the cooling rate is slow enough and there is sufficient time for the atoms or molecules in the system to align regularly during the cooling process, the alloy passes through pathway one at the melting point TmThe enthalpy value/volume will be reduced rapidly, finally get the crystalline material of periodic regular arrangement; if the cooling rate is sufficiently fast, the temperature is rapidly reduced to the glass transition temperature TgAtoms or molecules in the alloy are not regularly arranged, and sufficient relaxation time for nucleation and growth is not available, so that the alloy is changed into supercooled liquid through a second path and is finally solidified into an amorphous structure; wherein the glass transition temperature TgWith melting point TmThe middle is the supercooled liquid region of the amorphous alloy, and the amorphous alloy has high formability in the region.
The invention combines the electro-plasticity, the super-plasticity in the supercooled liquid region of the iron-based amorphous alloy and the skin effect generated by variable frequency current, and improves the greenhouse brittleness of the iron-based amorphous alloy; the inherent characteristics of the iron-based amorphous alloy strip are combined with the traditional rolling, and the roughness of the iron-based amorphous alloy strip is efficiently adjusted on line.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.
Claims (6)
1. The utility model provides a vacuum electric rolling device of online adjustment iron-based amorphous strip roughness which characterized in that: the device comprises a vacuum mechanism, tension mechanisms and electric rollers, wherein the tension mechanisms are arranged on the left side and the right side inside the vacuum mechanism and connected through tension belts, the electric rollers are respectively arranged on the upper side and the lower side of each tension belt, driving rollers are arranged on the outer sides of the electric rollers, a variable frequency power supply is arranged on one side of each tension belt, a temperature control assembly connected with the variable frequency power supply is arranged on the other side of each tension belt, the positive pole of the variable frequency power supply is connected with an electrode contact arranged on one side of each electric roller, and the negative pole of the variable frequency power supply is connected with the electrode contact arranged on the corresponding.
2. The vacuum electric rolling device for on-line adjusting the roughness of the iron-based amorphous strip according to claim 1, is characterized in that: the temperature control assembly comprises a temperature control system connected with the variable frequency power supply and temperature measuring blocks connected to two sides of the temperature control system, and the temperature measuring blocks are arranged on one side of the tension belt at certain intervals.
3. A vacuum electric rolling method for online adjusting the roughness of an iron-based amorphous strip is characterized by comprising the following steps: the method comprises the following steps:
s1, selecting an electric roller and a driving roller which meet the roughness requirement and arranging the electric roller and the driving roller on a four-roller mill;
s2, mounting a group of tension mechanisms on two sides of the four-high mill to provide rolling tension for the iron-based amorphous strip;
s3, passing the iron-based amorphous strip with the roughness required to be adjusted through a roller, loading the iron-based amorphous strip into a front and rear tension mechanism, and adjusting the rolling reduction;
s4, connecting the temperature control assembly and the variable frequency power supply to corresponding positions;
s5, vacuumizing the rolling environment through a vacuum mechanism to reach a vacuum state;
s6, preheating the iron-based amorphous strip by using a temperature control system and a variable frequency power supply;
s7, continuous temperature control rolling: forming a closed loop rolling of the preheated iron-based amorphous belt by a temperature control system, an electric roller, a variable frequency power supply and a vacuum mechanism;
and S8, warehousing the finished product meeting the roughness requirement of the iron-based amorphous strip.
4. The vacuum electric rolling method for on-line adjusting the roughness of the iron-based amorphous strip according to claim 3, characterized in that: in the step S3, the rolling reduction should be set between 10% and 15%.
5. The vacuum electric rolling method for on-line adjusting the roughness of the iron-based amorphous strip according to claim 3, characterized in that: in the step S6, the preheating temperature is controlled at 380-440 ℃.
6. The vacuum electric rolling method for on-line adjusting the roughness of the iron-based amorphous strip according to claim 3, characterized in that: in the step S7, the temperature during the continuous temperature-controlled rolling process is controlled at 480-540 ℃.
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| CN114798732A (en) * | 2022-06-30 | 2022-07-29 | 太原理工大学 | Method for regulating interface structure of bimetal laminated composite plate by multi-frequency composite current |
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| CN114798732A (en) * | 2022-06-30 | 2022-07-29 | 太原理工大学 | Method for regulating interface structure of bimetal laminated composite plate by multi-frequency composite current |
| CN114798732B (en) * | 2022-06-30 | 2022-10-21 | 太原理工大学 | Method for regulating interface structure of bimetal laminated composite plate by multi-frequency composite current |
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