CN112439799A - Production method of ultra-fine and ultra-high-strength synchronous belt steel cord - Google Patents
Production method of ultra-fine and ultra-high-strength synchronous belt steel cord Download PDFInfo
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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
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/525—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length for wire, for rods
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/02—Yarns or threads characterised by the material or by the materials from which they are made
- D02G3/12—Threads containing metallic filaments or strips
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/22—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre
- D02G3/26—Yarns or threads characterised by constructional features, e.g. blending, filament/fibre with characteristics dependent on the amount or direction of twist
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- D—TEXTILES; PAPER
- D02—YARNS; MECHANICAL FINISHING OF YARNS OR ROPES; WARPING OR BEAMING
- D02G—CRIMPING OR CURLING FIBRES, FILAMENTS, THREADS, OR YARNS; YARNS OR THREADS
- D02G3/00—Yarns or threads, e.g. fancy yarns; Processes or apparatus for the production thereof, not otherwise provided for
- D02G3/44—Yarns or threads characterised by the purpose for which they are designed
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Abstract
The invention discloses a production method of an ultra-fine and ultra-high strength synchronous belt steel cord, which relates to the technical field of rubber products and comprises the following steps: preparing a raw material wire rod, performing surface purification treatment, pickling and electrolytic phosphating; carrying out first dry drawing, first heat treatment, second dry drawing, second heat treatment, third dry drawing and third heat treatment on the raw material wire rod; electroplating copper-zinc alloy; drawing the water tank; the cord is twisted. The invention has the advantages that: through multiple times of dry drawing with different compression ratios and heat treatment with different heating temperatures and different take-up speeds, the surface quality of the steel wire is improved, the plasticity of the steel wire is improved, electrolytic phosphorization is carried out after the first heat treatment and the second heat treatment, the surface lubricating environment of the steel wire is improved, the drawing deformation is facilitated, and the ultrafine extra-high-strength monofilament with the diameter of 0.045-0.08mm and the strength of 4300-.
Description
Technical Field
The invention relates to the technical field of rubber products, in particular to a production method of an ultra-fine and ultra-high-strength synchronous belt steel cord.
Background
The ultra-fine and ultra-high strength synchronous belt steel cord is mainly applied to framework materials of high-grade synchronous belts, is mainly applied to connecting pieces of equipment in industries such as robots, foods, medicines and the like, and has the characteristics of low elongation, ultra-high strength, ultra-high breaking force, uniform through-strip property, high bonding force with synchronous belt rubber and the like.
In the prior art, the patent with application number 201410595340.3 discloses a manufacturing method of a monofilament steel cord, which is processed through the steps of surface pretreatment of a wire rod, dry-drawing, heat treatment electroplating, wet-drawing, twisting and untwisting, and the monofilament steel cord manufactured by the method has good strength, but for an ultra-fine and ultra-high strength steel cord, the fineness and the strength of the existing monofilament steel cord are difficult to break through only one dry-drawing, heat treatment and wet-drawing operation, the fineness and the strength of the produced steel cord are insufficient, the elongation and the breaking force performance are insufficient, the surface quality of the steel wire is poor, and the plasticity of the steel wire is poor. It is desirable to provide a method for producing an ultra-fine and ultra-high strength synchronous belt steel cord to produce an ultra-fine and ultra-high strength steel cord.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for producing an ultra-fine and ultra-high strength synchronous belt steel cord, which can solve the problems of the prior art that the produced steel cord is not thin enough in diameter, not high enough in strength, not enough in elongation and breaking force performance, poor in steel wire surface quality and poor in steel wire plasticity.
In order to solve the technical problems, the technical scheme of the invention is as follows: the method comprises the following steps:
s1, preparing a raw material wire rod, performing surface purification treatment, pickling and electrolytic phosphating;
s2, performing first dry drawing, first heat treatment, second dry drawing, second heat treatment, third dry drawing and third heat treatment on the raw material wire rod;
drawing the steel wire into a steel wire with the thickness of 1.8-2.8mm by a dry wire drawing machine for the first time, drawing the steel wire into a steel wire with the thickness of 1.0-1.1mm by dry wire drawing for the second time, drawing the steel wire into a steel wire with the thickness of 0.40-0.70 mm by a dry wire drawing machine for the third time, and gradually reducing the compression ratio of the first dry drawing, the second dry drawing and the third dry drawing so as to improve the surface quality of the steel wire and the plasticity of the steel wire;
after the first heat treatment, the second heat treatment and the third heat treatment are respectively carried out on the first dry drawing, the second dry drawing and the third dry drawing, the heating temperature of the first heat treatment and the second heat treatment is the same, the temperature of the third heat treatment is higher than that of the second heat treatment, the inter-lamellar spacing of the steel wire subjected to the third heat treatment is gradually reduced, the take-up speed is gradually increased, and electrolytic phosphorization is carried out after the first heat treatment and the second heat treatment to improve the surface lubrication environment of the steel wire;
s3, electroplating copper-zinc alloy: after the surface of the steel wire is purified, electroplating a layer of copper-zinc alloy on the surface of the steel wire;
s4, water tank drawing: drawing the steel wire plated with the copper-zinc alloy into a single wire with the diameter as follows: the total compression ratio is improved by the ultra-thin and ultra-high strength steel wire with the thickness of 0.045-0.08mm, and the monofilament strength of the drawn finished product is 4300-;
s5, cord stranding: and twisting the monofilament drawn from the water tank into a strand by using a microfilament micro-rope stranding machine, twisting the strand into a finished steel cord, and rolling, wherein the diameter of the steel cord is 0.07-0.60 mm.
Further, the diameter of the raw material wire rod is 4-6mm, and the raw material wire rod comprises the following chemical components in percentage by weight: 0.90 to 0.94 percent of carbon, 0.15 to 0.30 percent of silicon, 0.20 to 0.40 percent of manganese, 0.017max percent of phosphorus, 0.010max percent of sulfur, 0.003max percent of aluminum, 0.005max percent of nitrogen and 0.1mm max percent of decarburization depth, no full-circle decarburization is required, and the size of the non-metallic inclusion is less than 20 um.
Further, the first dry-drawing: the drawing pass of the first dry drawing is 5-10 passes, the total compression ratio is 75-89%, the partial compression ratio of 4-9 passes is 18-24%, the compression ratio of the last pass is 14-18%, the angle of a working area of a wire-drawing die is 8-10 degrees, the length of a sizing belt of the wire-drawing die is 20-35% D, and D is the diameter of an outlet monofilament;
the first heat treatment: heating by adopting a gas open-flame furnace at the temperature of 910-;
and (3) performing dry drawing for the second time: the drawing pass of the second dry drawing is 6-12 passes, the total compression ratio is 62-87%, the partial compression ratio is 16-20%, the angle of the working area of the wire-drawing die is 8-10 degrees, and the length of the sizing belt of the wire-drawing die is 20-35% D;
the second heat treatment: heating by adopting a gas open-fire furnace at the temperature of 910-;
the third dry-drawing: the drawing pass of the third dry drawing is 6-10 passes, the total compression ratio is 51-87%, the partial compression ratio is 15-20%, and the final compression ratio of 2 passes is 14-16%;
the third heat treatment: heating the steel wire by a gas open fire furnace at 920-.
Further, in the step S3, the surface of the steel wire is electroplated with a layer of copper-zinc alloy, the copper content is 64-80%, the grammage of the plating layer is 5-12g/kg, the strength of the steel wire is 1360-1500MPa, and the area shrinkage is 37.5-52%.
Further, the water tank is pulled: drawing the steel wire plated with the copper-zinc alloy into an ultra-thin and ultra-high-strength steel wire with the monofilament diameter of 0.045-0.08mm by an ultra-large strain drawing process, wherein the drawing passes are 23-35, the total compression ratio is 98.7-99.3%, the compression ratio of the last pass is 6-10%, the first 17-25 passes adopt tungsten steel die drawing, the working angle of a wire drawing die is 9-11 degrees, the length of a sizing belt is 20-35% D, the last 6-10 passes adopt a diamond die, the working angle is 6-10 degrees, and the length of the sizing belt is 15-25% D; the ovality of the diameter of the finished monofilament after drawing is less than 0.0005mm, and the diameter of the ring is 60-150 mm.
Further, cord stranding: the monofilament drawn from the water tank is twisted into a strand rope by a microfilament and microfilament strand twisting machine, the pre-deformation amount of the monofilament is 1.05-1.13D, then the strand rope is twisted into a finished steel cord, the lay length of the finished product is not more than 6mm, when the strand rope is twisted, the filament breakage can be caused due to the extremely fine diameter of the monofilament and the shake of a thread passing path, so that all thread passing paths need to adopt lightweight materials, after the strand rope is twisted, the false twister is used for carrying out over-twisting to control the residual torsion of the finished product, and the residual torsion of the finished product is 0 +/-3 turns/360 degrees.
The invention has the advantages that: through multiple times of dry drawing with different compression ratios and heat treatment with different heating temperatures and different take-up speeds, the surface quality of the steel wire is improved, the plasticity of the steel wire is improved, electrolytic phosphorization is carried out after the first heat treatment and the second heat treatment, the surface lubrication environment of the steel wire is improved, further drawing deformation is facilitated, the existing production process of the monofilament steel cord is broken through, the ultrafine extra-high-strength monofilament with the diameter of 0.045-0.08mm and the strength of 4300-.
Drawings
FIG. 1 is a table of parameters for a first dry drawing process of the present invention;
FIG. 2 is a table of parameters for a second dry-drawing process of the present invention;
FIG. 3 is a table of parameters for a third dry-drawing process of the present invention;
fig. 4 is a diagram showing the spacing between the steel wire sheets after the third heat treatment according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and the detailed description. The following examples are presented to enable one of ordinary skill in the art to more fully understand the present invention and are not intended to limit the scope of the embodiments described herein.
Example (b):
the production method of the 7x3x0.06mm superfine extra-high-strength steel wire rope comprises the following production steps:
s1, preparing a raw material wire rod, performing surface purification treatment, acid washing, and electrolytic phosphating: the raw material wire rod is NSC92ACR high-quality high-carbon steel, and the diameter is 5.5 mm;
s2, performing first dry drawing, first heat treatment, second dry drawing, second heat treatment, third dry drawing and third heat treatment on the raw material wire rod;
the first dry-drawing process comprises the following steps: the diameter of a raw material wire rod is drawn to be 2.5mm, the drawing passes are 7, the total compression ratio is 79.3%, the compression ratio distribution is in bridge distribution, the compression ratio of the first 6 passes is 19-23%, the compression ratio of the last pass is 17.4%, the die angle is 9 degrees, the sizing belt length of a wire drawing die is 20-35% D, D is the diameter of outlet monofilaments, and the process parameter table is shown in figure 1.
The first heat treatment process comprises the following steps: the steel wire is heated by a gas open-flame furnace, the outlet temperature of the heating furnace is 945 +/-3 ℃, the water bath AQ110 quenching liquid is used for preparing 10% aqueous solution for isothermal cooling, so that the steel wire forms a sorbite structure, the inter-lamellar spacing is 140-160nm, the take-up speed is 40m/min, a thin phosphating film is formed on the surface of the steel wire through electrolytic phosphating, the weight of the film is 6 +/-2 g/kg, the surface lubrication environment of the steel wire is improved, and the further drawing deformation is facilitated.
And (3) a second dry-drawing process: drawing the 2.50mm steel wire subjected to the first heat treatment into a 1.08mm steel wire, wherein the drawing pass of the second dry drawing is 8 passes, the total compression ratio is 81%, the partial compression ratio is 16-20%, the angle of a working area of a wire drawing die is 9 degrees, and the length of a sizing belt of the wire drawing die is 20-35% D; see in particular fig. 2.
And (3) second heat treatment: the steel wire is heated by a gas open-flame furnace, the outlet temperature of the heating furnace is 940 +/-3 ℃, the water bath AQ110 quenching liquid is used for preparing 10% aqueous solution for isothermal cooling, so that the steel wire forms a sorbite structure, the inter-lamellar spacing is between 120 plus and minus 140nm, the take-up speed is 50m/min, a thin phosphating film is formed on the surface of the steel wire through electrolytic phosphating, the weight of the film is 5 +/-2 g/kg, the surface lubrication environment of the steel wire is improved, and the further drawing deformation is facilitated.
And (3) a third dry-drawing process: drawing the 1.08mm steel wire subjected to the first heat treatment into a 0.62mm steel wire, wherein the drawing pass of the second dry drawing is 6 passes, the total compression ratio is 67.04%, the partial compression ratio is 16-18%, the angle of a working area of a wire drawing die is 9 degrees, and the length of a sizing belt of the wire drawing die is 20-35% D; see in particular fig. 3.
The third heat treatment and salt bath treatment process comprises the following steps: heating the 0.62mm steel wire subjected to the third dry drawing by a gas open fire furnace, wherein the outlet temperature of the heating furnace is 930 +/-3 ℃, and performing isothermal cooling treatment by using a domestic first-applied wire online salt bath to enable the steel wire to form a sorbite structure with the lamella spacing of 80-110um, wherein the sorbite structure is shown in fig. 4, the steel wire lamella spacing after the third heat treatment is shown in fig. 4, and the mark value is 10 lamella spacing length D, and the monolithic layer = D/10.
S3, electroplating copper-zinc alloy: after the surface of the steel wire is purified, electroplating a layer of copper-zinc alloy on the surface of the steel wire, wherein the copper content is as follows: 70 plus or minus 3 percent, the gram weight of the plating layer is 10 plus or minus 1.2g/kg, the steel wire strength is 1460 plus or minus 20Mpa, and the area shrinkage is 41.5 plus or minus 3 percent.
S4, water tank drawing: drawing a 0.62mm steel wire electroplated with copper-zinc alloy into an ultra-thin ultra-high strength steel wire with the monofilament diameter of 0.06mm by an ultra-large strain drawing process, wherein 31 passes of drawing are performed, the total compression ratio is 99.06%, the compression ratio of the last 1 pass is 8%, the former 23 passes are drawn by adopting a tungsten steel die, the working angle of a wire drawing die is 10 degrees, the length of a sizing belt is 20-35% D, D is the diameter of an outlet monofilament, the last 8 passes adopt a diamond die, the working angle is 8 degrees, and the length of the sizing belt is 15-25% D; the strength of the finished monofilament after drawing is 4600 +/-100 Mpa, the diameter ovality is less than 0.0005mm, and the ring diameter is 80-120 mm.
S5, cord stranding: firstly twisting 0.06 monofilament pulled out of a water tank into a strand rope 3x0.06 with a microfilament micro-rope stranding machine, wherein the pre-deformation amount of the monofilament is 1.05-1.13D, then twisting the strand rope into a finished steel cord 7x3x0.06, the lay length of the finished product is not more than 4.6mm, after the strand rope is twisted, carrying out over-twisting by a virtual twister to control the residual torsion of the finished product, and the residual torsion of the finished product is 0 +/-2 turns/360 degrees. The relevant physical properties are shown in Table 1 below.
The pickling, electrolytic phosphating, water bath and salt bath isothermal cooling of the embodiment all adopt conventional processes.
Table 1: and 7x3x0.06 steel cord physical property test table.
The production process of the ultra-fine and ultra-high strength monofilament can be popularized to other drawing fields, relates to the production process of a carborundum wire bus, and has extremely high market application prospect.
The foregoing shows and describes the general principles and features of the present invention, together with the advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A production method of an ultra-fine and ultra-high strength synchronous belt steel cord is characterized by comprising the following steps: the method comprises the following steps:
s1, preparing a raw material wire rod, performing surface purification treatment, pickling and electrolytic phosphating;
s2, performing first dry drawing, first heat treatment, second dry drawing, second heat treatment, third dry drawing and third heat treatment on the raw material wire rod;
drawing the steel wire into a steel wire with the thickness of 1.8-2.8mm by a dry wire drawing machine for the first time, drawing the steel wire into a steel wire with the thickness of 1.0-1.1mm by dry wire drawing for the second time, drawing the steel wire into a steel wire with the thickness of 0.40-0.70 mm by a dry wire drawing machine for the third time, and gradually reducing the compression ratio of the first dry drawing, the second dry drawing and the third dry drawing so as to improve the surface quality of the steel wire and the plasticity of the steel wire;
after the first heat treatment, the second heat treatment and the third heat treatment are respectively carried out on the first dry drawing, the second dry drawing and the third dry drawing, the heating temperature of the first heat treatment and the second heat treatment is the same, the temperature of the third heat treatment is higher than that of the second heat treatment, the inter-lamellar spacing of the steel wire subjected to the third heat treatment is gradually reduced, the take-up speed is gradually increased, and electrolytic phosphorization is carried out after the first heat treatment and the second heat treatment to improve the surface lubrication environment of the steel wire;
s3, electroplating copper-zinc alloy: after the surface of the steel wire is purified, electroplating a layer of copper-zinc alloy on the surface of the steel wire;
s4, water tank drawing: drawing the steel wire plated with the copper-zinc alloy into a single wire with the diameter as follows: the total compression ratio is improved by the ultra-thin and ultra-high strength steel wire with the thickness of 0.045-0.08mm, and the monofilament strength of the drawn finished product is 4300-;
s5, cord stranding: and twisting the monofilament drawn from the water tank into a strand by using a microfilament micro-rope stranding machine, twisting the strand into a finished steel cord, and rolling, wherein the diameter of the steel cord is 0.07-0.60 mm.
2. The method for producing an ultrafine extra high strength synchronous belt steel cord as claimed in claim 1, wherein: the diameter of the raw material wire rod is 4-6mm, and the raw material wire rod comprises the following chemical components in percentage by weight: 0.90 to 0.94 percent of carbon, 0.15 to 0.30 percent of silicon, 0.20 to 0.40 percent of manganese, 0.017max percent of phosphorus, 0.010max percent of sulfur, 0.003max percent of aluminum, 0.005max percent of nitrogen and 0.1mm max percent of decarburization depth, no full-circle decarburization is required, and the size of the non-metallic inclusion is less than 20 um.
3. The method for producing an ultrafine extra high strength synchronous belt steel cord as claimed in claim 1, wherein: the first dry-drawing: the drawing pass of the first dry drawing is 5-10 passes, the total compression ratio is 75-89%, the partial compression ratio of 4-9 passes is 18-24%, the compression ratio of the last pass is 14-18%, the angle of a working area of a wire-drawing die is 8-10 degrees, the length of a sizing belt of the wire-drawing die is 20-35% D, and D is the diameter of an outlet monofilament;
the first heat treatment: heating by adopting a gas open-flame furnace at the temperature of 910-;
and (3) performing dry drawing for the second time: the drawing pass of the second dry drawing is 6-12 passes, the total compression ratio is 62-87%, the partial compression ratio is 16-20%, the angle of the working area of the wire-drawing die is 8-10 degrees, and the length of the sizing belt of the wire-drawing die is 20-35% D;
the second heat treatment: heating by adopting a gas open-fire furnace at the temperature of 910-;
the third dry-drawing: the drawing pass of the third dry drawing is 6-10 passes, the total compression ratio is 51-87%, the partial compression ratio is 15-20%, and the final compression ratio of 2 passes is 14-16%;
the third heat treatment: heating the steel wire by a gas open fire furnace at 920-.
4. The method for producing an ultrafine extra high strength synchronous belt steel cord as claimed in claim 1, wherein: in the step S3, the surface of the steel wire is electroplated with a layer of copper-zinc alloy, the copper content is 64-80%, the coating gram weight is 5-12g/kg, the steel wire strength is 1360-1500MPa, and the area shrinkage is 37.5-52%.
5. The method for producing an ultrafine extra high strength synchronous belt steel cord as claimed in claim 1, wherein: drawing the water tank: drawing the steel wire plated with the copper-zinc alloy into an ultra-thin and ultra-high-strength steel wire with the monofilament diameter of 0.045-0.08mm by an ultra-large strain drawing process, wherein the drawing passes are 23-35, the total compression ratio is 98.7-99.3%, the compression ratio of the last pass is 6-10%, the first 17-25 passes adopt tungsten steel die drawing, the working angle of a wire drawing die is 9-11 degrees, the length of a sizing belt is 20-35% D, the last 6-10 passes adopt a diamond die, the working angle is 6-10 degrees, and the length of the sizing belt is 15-25% D; the ovality of the diameter of the finished monofilament after drawing is less than 0.0005mm, and the diameter of the ring is 60-150 mm.
6. The method for producing an ultrafine extra high strength synchronous belt steel cord as claimed in claim 1, wherein: cord stranding: the monofilament drawn from the water tank is twisted into a strand rope by a microfilament and microfilament strand twisting machine, the pre-deformation amount of the monofilament is 1.05-1.13D, then the strand rope is twisted into a finished steel cord, the lay length of the finished product is not more than 6mm, when the strand rope is twisted, the filament breakage can be caused due to the extremely fine diameter of the monofilament and the shake of a thread passing path, so that all thread passing paths need to adopt lightweight materials, after the strand rope is twisted, the false twister is used for carrying out over-twisting to control the residual torsion of the finished product, and the residual torsion of the finished product is 0 +/-3 turns/360 degrees.
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| CN115162036A (en) * | 2021-04-01 | 2022-10-11 | 泰州俊宇不锈钢材料有限公司 | Processing and twisting method for conveniently-used special alloy microfilament processing |
| CN113668027A (en) * | 2021-07-29 | 2021-11-19 | 江苏兴达钢帘线股份有限公司 | Method for manufacturing brass plating layer steel wire, tire bead steel wire, rubber tube steel wire and steel cord |
| CN115229700A (en) * | 2022-07-27 | 2022-10-25 | 镇江原轼新型材料有限公司 | Tungsten wire and saw wire |
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