CN111495984A - Production method of reducing round bar rolled steel - Google Patents
Production method of reducing round bar rolled steel Download PDFInfo
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- CN111495984A CN111495984A CN202010389369.1A CN202010389369A CN111495984A CN 111495984 A CN111495984 A CN 111495984A CN 202010389369 A CN202010389369 A CN 202010389369A CN 111495984 A CN111495984 A CN 111495984A
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- rolling
- bar stock
- rolled steel
- round bar
- soaking
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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
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/56—Elongation control
-
- 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
- B21C1/16—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes
- B21C1/20—Metal drawing by machines or apparatus in which the drawing action is effected by other means than drums, e.g. by a longitudinally-moved carriage pulling or pushing the work or stock for making metal sheets, bars, or tubes from stock of essentially unlimited length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
- C21D1/42—Induction heating
-
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Physics & Mathematics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Heat Treatment Of Steel (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a production method of reducing round bar rolled steel, which comprises the following steps: selecting a billet made of a corresponding material according to the requirements of customers; hot rolling: carrying out hot rolling on the steel billet in the step 1, cooling the hot-rolled bar stock, and then entering a step 3; cold drawing: performing cold drawing on the hot-rolled bar stock, wherein the diameter of the cold-drawn bar stock is the maximum diameter of a final product; local stretching: locally stretching the cold-drawn bar stock according to the requirements of customers; soaking treatment: conveying the partially stretched bar stock into a soaking furnace for soaking; discharging: naturally cooling after soaking treatment, and packaging and discharging after cooling size correction. The invention can roll the bars with different diameters on the same bar according to the requirements of customers, can provide personalized customization, and can reduce the workload of later machining to avoid resource waste.
Description
Technical Field
The invention relates to a bar rolling production method, in particular to a production method capable of rolling variable-diameter round bar rolled steel with different diameters on the same bar, and belongs to the technical field of steel rolling production.
Background
Steel rolling, in which a steel ingot is changed between rotating rollers, and a pressure processing process of a billet shape is called steel rolling. The purpose of rolling is the same as other press working, on the one hand, to obtain the desired shape, for example: steel plates, strip steels, wire rods, and various types of steel sections; on the other hand, in order to improve the internal quality of steel, common automobile plates, bridge steel, boiler steel, pipeline steel, deformed steel, steel bars, electrical silicon steel, galvanized plates and tin-plated plates, including train wheels, are processed by a steel rolling process.
According to the production process, round steel is divided into three types, namely hot rolling, forging and cold drawing, but the bars produced by any processing process have the same size. Round steel with a diameter of more than 25 mm is called round bar or rod, and is mainly used for manufacturing machine parts, tube blanks of seamless steel tubes and the like. During mechanical manufacturing, such round bars are usually machined into shaft parts with different diameters, and in the case of the same shaft with two or more diameters, the machining is usually performed; the workload of machining is increased under the condition of relatively large diameter, and simultaneously, a large amount of scrap iron is generated to cause resource waste; therefore, the diameter-variable round rods with different diameters can be rolled on the same bar stock according to the application requirements of the round rods, but the traditional steel rolling process cannot meet the individual requirements of customers to roll the diameter-variable round rods.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the problem that the existing steel rolling process can not roll the diameter-variable round bar, the invention provides a production method for rolling steel by rolling the diameter-variable round bar with different diameters on the same bar stock.
The technical scheme is as follows: a production method of reducing round bar rolled steel comprises the following steps:
1) selecting materials: selecting a billet made of a corresponding material according to the requirements of customers;
2) hot rolling: carrying out hot rolling on the steel billet in the step 1, cooling the hot-rolled bar stock, and then entering a step 3;
3) cold drawing: performing cold drawing on the hot-rolled bar stock, wherein the diameter of the cold-drawn bar stock is the maximum diameter of a final product;
4) local stretching: locally stretching the cold-drawn bar stock according to the requirements of customers;
5) soaking treatment: conveying the partially stretched bar stock into a soaking furnace for soaking;
6) discharging: naturally cooling after soaking treatment, and packaging and discharging after cooling size correction.
The invention can roll the bars with different diameters on the same bar according to the requirements of customers, can provide personalized customization, and can reduce the workload of later machining to avoid resource waste.
Preferably, the initial rolling temperature in the hot rolling process in the step 2 is controlled to be 80% of the solidus temperature in the phase diagram of the alloy, and the final rolling temperature is controlled to be above the recrystallization temperature of the alloy.
Preferably, the hot rolling in the step 2 is divided into an initial rolling stage, an intermediate rolling stage and a final rolling stage, the processing rate of the initial rolling stage is 5% -10%, the processing rate of the intermediate rolling stage is 50% -70%, and the processing rate of the final rolling stage is 15% -20%.
Preferably, the cold drawing process in the step 3 comprises heading rolling, oxide skin removal by acid washing, cold drawing and straightening, wherein the acid washing temperature is controlled to be 50-70 ℃ during acid washing, the acid washing time is 40-60min, and the acid solution comprises the following components in percentage by mass: 6 percent of hydrofluoric acid, 12 percent of nitric acid and the balance of water, wherein the sum of the components is 100 percent.
Preferably, the method for local stretching in step 4 is to convey the bar stock at a proper position to an induction heating device through a conveying mechanism for local heating, and after heating, local stretching is performed.
Preferably, the induction heating device controls the heating frequency to be 15000-.
Preferably, the temperature in the soaking pit is controlled at 800-1200 ℃, and the heat preservation is carried out for 2-5 minutes.
Has the advantages that: the invention can roll the bars with different diameters on the same bar according to the requirements of customers, can provide personalized customization, and can reduce the workload of later machining to avoid resource waste.
Drawings
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
Embodiments will be described in detail below with reference to the accompanying drawings.
As shown in figure 1, the production method of the reducing round bar rolled steel comprises the following steps:
1) selecting materials: selecting a billet made of a corresponding material according to the requirements of customers;
2) hot rolling: carrying out hot rolling on the steel billet in the step 1, cooling the hot-rolled bar stock, and then entering a step 3;
the hot rolling is divided into an initial rolling stage, an intermediate rolling stage and a final rolling stage, the processing rate of the initial rolling stage is 5-10%, the initial rolling processing rate is low, and the biting condition is met because the casting structure is mainly changed into the processing structure in the first few times; along with the improvement of the metal processing performance, if the equipment condition allows, the pass deformation should be increased as much as possible, and the processing rate of the intermediate rolling stage is 50-70%; in order to prevent the hot-rolled product from generating coarse grains, the final processing rate of hot rolling is larger than the critical deformation, the final rolling temperature of hot rolling is lower, the deformation resistance is larger, and the processing rate of the maximum stretching rolling stage is 15-20%;
the initial rolling temperature in the hot rolling process is controlled to be 80% of the solidus temperature in an alloy phase diagram, and the final rolling temperature is controlled to be higher than the recrystallization temperature of the alloy. The heating temperature is determined by 80% of the solidus line of the alloy, the initial rolling temperature is determined mainly by about 80% of the solidus temperature in an alloy phase diagram, and the final rolling temperature is determined by a plasticity diagram of the alloy and is generally required to be controlled to be higher than the recrystallization temperature of the alloy.
3) Cold drawing: performing cold drawing on the hot-rolled bar stock, wherein the diameter of the cold-drawn bar stock is the maximum diameter of a final product;
the cold drawing process comprises rolling, removing oxide skin by acid washing, cold drawing and straightening, wherein the acid washing temperature is controlled to be 50-70 ℃ during acid washing, the acid washing time is 40-60min, and acid liquor comprises the following components in percentage by mass: 6 percent of hydrofluoric acid, 12 percent of nitric acid and the balance of water, wherein the sum of the components is 100 percent.
4) Local stretching: locally stretching the small-diameter part of the cold-drawn bar according to the requirements of customers;
the local stretching method is that the proper position of the bar stock is conveyed to the induction heating device through the conveying mechanism to be locally heated, and the bar stock is locally stretched after being heated.
The induction heating device controls the heating frequency to be 15000-80000HZ and the heating power to be 15-250KW according to the diameter of the bar.
5) Soaking treatment: conveying the partially stretched bar stock into a soaking furnace for soaking;
the temperature in the soaking pit is controlled to be 800-1200 ℃, and the heat preservation is carried out for 2-5 minutes.
6) Discharging: naturally cooling after soaking treatment, and packaging and discharging after cooling size correction.
The invention can roll the bars with different diameters on the same bar according to the requirements of customers, can provide personalized customization, and can reduce the workload of later machining to avoid resource waste.
Claims (7)
1. A production method of reducing round bar rolled steel is characterized by comprising the following steps:
1) selecting materials: selecting a billet made of a corresponding material according to the requirements of customers;
2) hot rolling: carrying out hot rolling on the steel billet in the step 1, cooling the hot-rolled bar stock, and then entering a step 3;
3) cold drawing: performing cold drawing on the hot-rolled bar stock, wherein the diameter of the cold-drawn bar stock is the maximum diameter of a final product;
4) local stretching: locally stretching the cold-drawn bar stock according to the requirements of customers;
5) soaking treatment: conveying the partially stretched bar stock into a soaking furnace for soaking;
6) discharging: naturally cooling after soaking treatment, and packaging and discharging after cooling size correction.
2. The method for producing the variable diameter round bar rolled steel according to claim 1, characterized in that: in the step 2, the initial rolling temperature in the hot rolling process is controlled to be 80% of the solidus temperature in the alloy phase diagram, and the final rolling temperature is controlled to be above the recrystallization temperature of the alloy.
3. The method for producing the variable diameter round bar rolled steel according to claim 1, characterized in that: the hot rolling in the step 2 is divided into an initial rolling stage, an intermediate rolling stage and a final rolling stage, wherein the processing rate of the initial rolling stage is 5% -10%, the processing rate of the intermediate rolling stage is 50% -70%, and the processing rate of the final rolling stage is 15% -20%.
4. The method for producing the variable diameter round bar rolled steel according to claim 1, characterized in that: the cold drawing process in the step 3 comprises rolling, acid washing to remove oxide skin, cold drawing and straightening, wherein the acid washing temperature is controlled to be 50-70 ℃ during acid washing, the acid washing time is 40-60min, and acid liquor comprises the following components in percentage by mass: 6 percent of hydrofluoric acid, 12 percent of nitric acid and the balance of water, wherein the sum of the components is 100 percent.
5. The method for producing the variable diameter round bar rolled steel according to claim 1, characterized in that: and the local stretching method in the step 4 is to convey the proper position of the bar stock to an induction heating device through a conveying mechanism for local heating, and perform local stretching after heating.
6. The method for producing the variable diameter round bar rolled steel according to claim 5, wherein the method comprises the following steps: the induction heating device controls the heating frequency to be 15000-80000HZ and the heating power to be 15-250KW according to the diameter of the bar.
7. The method for producing the variable diameter round bar rolled steel according to claim 1, characterized in that: the temperature in the soaking pit is controlled to be 800-1200 ℃, and the heat preservation is carried out for 2-5 minutes.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010389369.1A CN111495984A (en) | 2020-05-10 | 2020-05-10 | Production method of reducing round bar rolled steel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010389369.1A CN111495984A (en) | 2020-05-10 | 2020-05-10 | Production method of reducing round bar rolled steel |
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2020
- 2020-05-10 CN CN202010389369.1A patent/CN111495984A/en active Pending
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| CN1314218A (en) * | 2001-04-02 | 2001-09-26 | 山西榆次华益型钢实业有限公司 | Forming process for T-shaped lift rail |
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