CN113680840B - Drawing process of high-carbon steel filaments - Google Patents
Drawing process of high-carbon steel filaments Download PDFInfo
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- CN113680840B CN113680840B CN202110834463.8A CN202110834463A CN113680840B CN 113680840 B CN113680840 B CN 113680840B CN 202110834463 A CN202110834463 A CN 202110834463A CN 113680840 B CN113680840 B CN 113680840B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C1/00—Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
- B21C1/02—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums
- B21C1/04—Drawing metal wire or like flexible metallic material by drawing machines or apparatus in which the drawing action is effected by drums with two or more dies operating in series
Abstract
The invention discloses a drawing process of high-carbon steel filaments, which comprises the steps of continuously cold drawing high-carbon pearlite steel filaments with the diameter less than or equal to 0.65mm and the tensile strength of more than 1300MPa through a plurality of wire drawing dies to obtain filaments with the diameter of 0.03-0.06 mm and the tensile strength of 4000-5000 MPa, wherein the deformation of drawing passes is 6-20%. The high-carbon steel filament obtained by the method has high dimensional accuracy, good surface quality, no layering of filament torsion, difficult filament breakage phenomenon in the drawing process, higher yield and capability of realizing stable and mass production.
Description
Technical Field
The invention relates to a drawing process of high-carbon steel filaments, and belongs to the technical field of metal wire processing.
Background
In the prior art, for the metal wire with the diameter smaller than 0.1mm, annealing treatment is usually needed in the drawing process, so that the processing technology becomes complicated, a great deal of manpower and financial resources are consumed, and the strength level of the product is reduced. For the high-carbon steel filaments with the diameter smaller than 0.06mm, the conventional drawing process is adopted for production due to the influence of factors such as larger total compression ratio, die hole manufacturing precision, die penetrating operation and the like, so that the broken filaments are seriously drawn, the wiredrawing deformation capability is poor, monofilaments are easy to twist and delaminate, the yield is low, the production efficiency is reduced, and the manufacturing cost is increased.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a drawing process of high-carbon steel filaments, which improves the yield and production efficiency of the high-carbon steel filaments.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the invention provides a drawing process of high-carbon steel filaments, which comprises the following steps of: and continuously cold drawing the high-carbon pearlite steel wire with the diameter less than or equal to 0.65mm and the tensile strength more than 1300MPa through a plurality of wire drawing dies to obtain the filaments with the diameter of 0.03-0.06 mm and the tensile strength of 4000-5000 MPa, wherein the deformation of the drawing process pass is 6-20%.
Further, the continuous cold drawing is divided into the following stages:
the first stage: when the true strain of the drawn high-carbon pearlitic steel wire is less than or equal to 1.5, adopting a trend of ascending and descending to match the die, wherein the pass deformation is 15-20%;
and a second stage: when the true strain of the drawn high-carbon pearlitic steel wire is between 1.5 and 4, the pass deformation fluctuates between 16 and 18 percent;
and a third stage: when the true strain of the drawn high-carbon pearlitic steel wire is more than or equal to 4, the pass deformation fluctuates between 6 and 15 percent.
Further, the deformation of the third time in the first stage is the largest, and the deformation of the finished product mold in the third stage is the smallest.
Further, the high-carbon pearlitic steel wire is subjected to continuous cold drawing through 25-30 wire drawing dies.
Further, the wire drawing die comprises a process dual die, and the process dual die is arranged in the last 5 passes of the wire drawing die.
Further, the number of the double modes in the process is not more than 3, and the double modes are used for changing the pass deformation.
Further, when the diameter of the high-carbon pearlitic steel wire is more than or equal to 0.15mm, drawing by using a conventional tungsten steel die; after the high carbon pearlite wire diameter is <0.15mm, a polycrystalline die is used for drawing.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a drawing process of high-carbon steel filaments, which can be used for continuous drawing without annealing treatment in the middle, has simple preparation method, saves energy and reduces consumption, and greatly reduces the manufacturing cost of the high-carbon steel filaments;
through carrying out scientific ratio to the wire drawing mould, be difficult for taking place the broken silk phenomenon during drawing, the yield is higher, can realize stable, batch production.
The high-carbon steel filament obtained by the process is difficult to delaminate after torsion, and has high dimensional accuracy and good surface quality.
Drawings
FIG. 1 is a drawing pass deformation chart in example 1 of the present invention;
FIG. 2 is a graph showing the deformation amount of the drawing pass in example 2 of the present invention;
FIG. 3 is a drawing pass deformation chart in example 3 of the present invention;
FIG. 4 is a graph showing the deformation amount of the drawing pass in example 4 of the present invention;
FIG. 5 is a diagram of a torsional fracture of a F0.06mm filament prepared in the prior art;
FIG. 6 is a diagram of a torsional fracture of an F0.06mm filament prepared in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.
In the description of the present invention, it is to be understood that in the description of the present invention, unless otherwise indicated, the meaning of "a plurality" means two or more. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.
The conventional filament drawing process generally has a smaller first pass compression ratio, a maximum second pass compression ratio, and gradually decreasing each pass compression ratio later, wherein the compression ratio of the finished product pass is the minimum. The filament with the diameter less than or equal to 0.06mm is drawn by the traditional method, so that the drawing broken filament is serious, and the monofilament is easy to twist and delaminate.
According to the drawing process of the high-carbon steel filament, provided by the invention, the high-carbon pearlite steel filament with the diameter less than or equal to 0.65mm and the tensile strength of more than 1300MPa is subjected to continuous cold drawing through 25-30 drawing dies to obtain the filament with the diameter of 0.03-0.06 mm and the tensile strength of 4000-5000 MPa, the deformation of the drawing process pass is 6-20%, severe drawing broken filaments can be prevented, and the drawing die temperature and residual stress of the steel wire are reduced.
Wherein the continuous cold drawing process comprises the following three stages:
the first stage: when the true strain of the drawn high-carbon pearlitic steel wire is less than or equal to 1.5, adopting a trend of ascending and descending to match the die, wherein the pass deformation is 15-20%, and the 3 rd pass deformation reaches the maximum;
and a second stage: when the true strain of the drawn high-carbon pearlitic steel wire is between 1.5 and 4, the pass deformation fluctuates between 16 and 18 percent;
and a third stage: when the true strain of the drawn high-carbon pearlitic steel wire is more than or equal to 4, the pass deformation amount fluctuates between 6 and 15 percent, and particularly, the pass deformation amount of a finished product die is minimum.
The number of the double modes in the process is not more than 3, the positions are placed on the 2 th to 5 th passes, and the total number of the dies is not more than 30. The dual mode drawing is used in the last 5 passes because the increase in tensile strength of the filaments is mainly concentrated on the last 5 passes and the work hardening rate is higher.
The double mode is added in the last 5 passes, so that the pass deformation can be changed, and the work hardening rate is reduced, thereby effectively reducing the residual stress of the steel wire, effectively controlling the diameter of the ring, reducing the demolding temperature of the filament, and ensuring that the steel wire is not easy to delaminate after torsion.
As shown in figures 5 and 6, which are respectively F0.06mm filament torsion fracture diagrams prepared by the prior art and the process of the invention, the comparison can find that the F0.06mm filament torsion fracture prepared by the prior art presents layering phenomenon, and the F0.06mm filament torsion fracture prepared by the drawing process of the high-carbon steel filament provided by the invention is not layered.
Because the thinner the diameter of the steel wire is, the more difficult the drawing is, when the diameter of the steel wire is more than or equal to 0.15mm, the drawing is carried out by using a conventional tungsten steel die; after the diameter of the steel wire is less than 0.15mm, the steel wire is drawn by using a polycrystalline die, and the polycrystalline die has high precision and smooth surface, so that the drawing of the steel wire with a small diameter is facilitated.
When the diameter of the steel wire is less than 0.08mm, the steel wire is firstly corroded and sharpened by the corrosive liquid and then subjected to die penetration, so that the steel wire is not easy to break, the operation of a worker is convenient, the time of one machine tool can be saved by 10-20 min, the die penetration efficiency is improved, and the used corrosive liquid is hydrochloric acid solution or nitric acid solution.
Example 1:
as shown in fig. 1, a drawing pass deformation graph of the f0.06mm filament in example 1 of the present invention is shown, wherein the continuous cold drawing process comprises the following three stages:
the first stage: when the true strain of the high-carbon pearlite steel wire is less than or equal to 1.5, adopting a mode matching trend of ascending and descending, wherein the pass deformation is 16-20%, and the 3 rd pass deformation reaches the maximum value of 19.67%;
and a second stage: when the true strain of the high-carbon pearlite steel wire is between 1.5 and 4, the pass deformation fluctuates between 16 and 18 percent;
and a third stage: when the true strain of the high-carbon pearlite steel wire is more than or equal to 4, the pass deformation amount fluctuates between 12-15%, and the pass deformation amount of the finished product die is minimum and is 12.11%.
According to the drawing process shown in fig. 1, filaments with the diameter of 0.06mm are produced, the tensile strength is 4379MPa, the torsion value is 73-80 circles, the filament demolding temperature is 130-150 ℃, the broken filament length exceeds 120 ten thousand meters, and the product performance meets the requirements.
In the drawing process shown in fig. 1, a double die is added to the 2-4 times of the last process, and the square of the diameter of the die hole is the product of the wire diameter of the previous pass and the wire diameter of the next pass. The torsion value of the produced filament is improved by 5-8 circles, and the torsion fracture is not layered; simultaneously, the demolding temperature of the filament can be reduced to be less than 120 ℃; the residual stress of the steel wire is reduced, and the diameter of the filament ring is more than 200mm.
Example 2:
FIG. 2 is a graph of F0.055mm filament drawing pass deflection in example 2 of the present invention, wherein continuous cold drawing comprises the following three stages:
the first stage: when the true strain of the high-carbon pearlite steel wire is less than or equal to 1.5, adopting a mode matching trend of ascending and descending, wherein the pass deformation is 16-20%, and the 3 rd pass deformation reaches the maximum value of 19.67%;
and a second stage: when the true strain of the high-carbon pearlite steel wire is between 1.5 and 4, the pass deformation fluctuates between 16 and 18 percent;
and a third stage: when the true strain of the high-carbon pearlite steel wire is more than or equal to 4, the pass deformation amount fluctuates between 6 and 15 percent, and the pass deformation amount of the finished product die is minimum and is 6.89 percent.
Filaments with the diameter of 0.055mm are produced according to the drawing process shown in fig. 2, the tensile strength is 4405MPa, the torsion value is 65-78 circles, the filament demolding temperature is 130-145 ℃, the broken filament length exceeds 80 ten thousand meters, and the product performance meets the requirements.
In the drawing process shown in fig. 2, a double die is added to the 3-5 times of the last process, and the square of the diameter of the die hole is the product of the wire diameter of the previous process and the wire diameter of the next process. The torsion value of the produced filament is improved by 3-5 circles, and the torsion fracture is not layered; simultaneously, the demolding temperature of the filament can be reduced to be less than 120 ℃; the residual stress of the steel wire is reduced, and the diameter of the filament ring is more than 200mm.
Example 3:
FIG. 3 is a graph of F0.05mm filament drawing pass deflection in example 3 of the present invention, wherein continuous cold drawing includes the following three stages:
the first stage: when the true strain of the high-carbon pearlite steel wire is less than or equal to 1.5, adopting a mode matching trend of ascending and descending, wherein the pass deformation is 15-20%, and the 3 rd pass deformation reaches the maximum value of 19.22%;
and a second stage: when the true strain of the high-carbon pearlite steel wire is between 1.5 and 4, the pass deformation fluctuates between 16 and 18 percent;
and a third stage: when the true strain of the high-carbon pearlite steel wire is more than or equal to 4, the pass deformation amount fluctuates between 7 and 15 percent, and the pass deformation amount of the finished product die is minimum and is 7.54 percent.
According to the drawing process shown in fig. 3, filaments with the diameter of 0.05mm are produced, the tensile strength is 4489MPa, the torsion value is 62-75 circles, the filament demolding temperature is 130-145 ℃, the broken filament length exceeds 80 ten thousand meters, and the product performance meets the requirements.
In practice, according to the drawing process shown in fig. 3, a process double die is added to each of the 2 nd and 4 th passes, and the square of the die diameter is the product of the wire diameter of the previous pass and the wire diameter of the next pass. The torsion value of the produced filament is improved by 3-5 circles, and the torsion fracture is not layered; simultaneously, the demolding temperature of the filament can be reduced to be less than 120 ℃; the residual stress of the steel wire is reduced, and the diameter of the filament ring is more than 150mm.
Example 4:
FIG. 4 is a plot of F0.03mm filament drawing pass deflection in example 4 of the present invention, wherein continuous cold drawing includes the following three stages:
the first stage: when the true strain of the high-carbon pearlite steel wire is less than or equal to 1.5, adopting a mode matching trend of ascending and descending, wherein the pass deformation is 15-20%, and the 3 rd pass deformation reaches the maximum value of 19.27%;
and a second stage: when the true strain of the high-carbon pearlite steel wire is between 1.5 and 4, the pass deformation fluctuates between 16 and 18 percent;
and a third stage: when the true strain of the high-carbon pearlite steel wire is more than or equal to 4, the pass deformation amount fluctuates between 6 and 15 percent, and the pass deformation amount of the finished product die is minimum and is 6.35 percent.
According to the drawing process shown in fig. 4, filaments with the diameter of 0.03mm are produced, the tensile strength is 4865MPa, the torsion value is 44-50 circles, the filament demolding temperature is 125-140 ℃, the broken filament length exceeds 15 ten thousand meters, and the product performance meets the requirements.
In practice, according to the drawing process shown in fig. 4, a double die is added to the 4 th pass, and the square of the diameter of the die hole is the product of the diameter of the previous pass and the diameter of the next pass. The torsion value of the produced filament is improved by 3-5 circles, the torsion fracture is not layered, and meanwhile, the demolding temperature of the filament can be reduced to be less than 115 ℃; the residual stress of the steel wire is reduced, and the diameter of the filament ring is more than 150mm.
According to examples 1-4, the high-carbon steel microfine wire obtained by the method has high dimensional accuracy, good surface quality, no layering in filament torsion, difficult filament breakage in the drawing process, high yield and capability of realizing stable and mass production.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (6)
1. A drawing process of high carbon steel filaments, comprising the steps of: continuously cold drawing the high-carbon pearlite steel wire with the diameter less than or equal to 0.65mm and the tensile strength more than 1300MPa through a plurality of wire drawing dies to obtain high-carbon steel filaments with the diameter of 0.03-0.06 mm and the tensile strength of 4000-5000 MPa, wherein the deformation of the drawing pass is 6-20%;
the continuous cold drawing is divided into the following stages:
the first stage: when the true strain of the drawn high-carbon pearlitic steel wire is less than or equal to 1.5, adopting a trend of ascending and descending to match the die, wherein the pass deformation is 15-20%;
and a second stage: when the true strain of the drawn high-carbon pearlitic steel wire is more than 1.5 and less than 4, the pass deformation fluctuates between 16 and 18 percent;
and a third stage: when the true strain of the drawn high-carbon pearlitic steel wire is more than or equal to 4, the pass deformation fluctuates between 6 and 15 percent.
2. A drawing process for high carbon steel filaments as claimed in claim 1 wherein the third pass deformation in the first stage is at a maximum and the final die pass deformation in the third stage is at a minimum.
3. The drawing process of the high-carbon steel filament according to claim 1, wherein the high-carbon pearlite steel filament is subjected to continuous cold drawing through 25-30 drawing dies.
4. A drawing process for high carbon steel filaments as claimed in claim 1 wherein the drawing die comprises a process die which is arranged in the last 5 passes of the drawing die.
5. The drawing process of high carbon steel filaments as claimed in claim 4, wherein the number of the double modes is not more than 3.
6. The drawing process of the high-carbon steel filament according to claim 1, wherein when the diameter of the high-carbon pearlite steel filament is more than or equal to 0.15mm, a conventional tungsten steel die is used for drawing; when the diameter of the high carbon pearlite steel wire is less than 0.15mm, the polycrystalline die drawing is used.
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| CN202110834463.8A CN113680840B (en) | 2021-07-23 | 2021-07-23 | Drawing process of high-carbon steel filaments |
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| CN202110834463.8A CN113680840B (en) | 2021-07-23 | 2021-07-23 | Drawing process of high-carbon steel filaments |
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| JP3273686B2 (en) * | 1993-12-29 | 2002-04-08 | 株式会社ブリヂストン | Manufacturing method of steel cord for rubber reinforcement |
| JP3983218B2 (en) * | 2003-10-23 | 2007-09-26 | 株式会社神戸製鋼所 | Ultra fine high carbon steel wire excellent in ductility and method for producing the same |
| JP5615498B2 (en) * | 2009-01-14 | 2014-10-29 | 株式会社ブリヂストン | Steel cord for reinforcing rubber articles and pneumatic tire using the same |
| CN103966417B (en) * | 2013-01-31 | 2016-04-20 | 张家港市骏马钢帘线有限公司 | A kind of processing method improving ultra-fine high-carbon steel wire surface quality and drawing property |
| CN103357694A (en) * | 2013-07-25 | 2013-10-23 | 张家港市胜达钢绳有限公司 | Method for producing tire bead steel wire |
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