CN117862237A - Combined treatment method for inhibiting hot rolling warpage of titanium alloy plate - Google Patents
Combined treatment method for inhibiting hot rolling warpage of titanium alloy plate Download PDFInfo
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- CN117862237A CN117862237A CN202410202706.XA CN202410202706A CN117862237A CN 117862237 A CN117862237 A CN 117862237A CN 202410202706 A CN202410202706 A CN 202410202706A CN 117862237 A CN117862237 A CN 117862237A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
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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
- B21B37/46—Roll speed or drive motor control
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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
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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
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/004—Heating the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/02—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
- B21B45/0203—Cooling
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Abstract
The invention discloses a combined treatment method for inhibiting hot rolling and warping of a titanium alloy plate, which is characterized in that two or more treatment modes provided by the technical scheme are selected to solve the problem of rolling and warping/tapping of a titanium alloy medium plate according to the actual temperature difference and hot rolling and warping amount of titanium alloy plates of different brands after being heated by a stepping gas furnace. The combination processing mode comprises a mode one: after the blank is discharged out of the furnace, placing air cooling on a roller way in front of the machine, and beginning to roll after the temperature difference between the upper surface and the lower surface is reduced to be within 10 ℃; mode two: after the heating temperature of the blank is increased, the air cooling time of the discharging furnace is prolonged, and if the measured temperature difference is more than or equal to 35 ℃, the blank is air cooled for 35-40 s and then is sent into rolling and the like. The rolling warp problem caused by uneven heating of the blank can be flexibly and effectively solved by adopting a plurality of modes, the overall operation is simple, the repeatability is realized, the flatness of the rolled plate is high, the repeated cost of the working procedure is reduced, and the precondition guarantee is provided for the follow-up process execution and the realization of the target specification.
Description
Technical Field
The invention belongs to the field of titanium alloy hot-working forming, relates to a hot-rolling preparation process technology of a titanium alloy medium plate, and particularly relates to a combined treatment method for inhibiting hot-rolling warping of a titanium alloy plate.
Background
Titanium and titanium alloy have the advantages of low density, high specific strength, low heat conductivity, good high-temperature and low-temperature resistance, strong corrosion resistance, good biocompatibility and the like, which are not possessed by other metals, and the titanium and titanium alloy has wide application in the fields of aviation, aerospace, chemical industry, construction, medical treatment and the like. The use amount of the titanium alloy plate is increased year by year in recent years, the demand amount of each field is greatly increased, and the yield of the titanium plate and strip product is increased by nearly 50% in all titanium processing materials. In the whole production cost of the titanium alloy plate, the processing cost is relatively high, so that part of enterprises can use the route of the steel-titanium joint production mode, and the equipment input cost and the energy consumption can be greatly reduced.
The traditional steel hot rolling preparation is often matched with a gas furnace for heating, and the equipment has certain defects in the production of titanium alloy. When a thick plate blank in the titanium alloy with large single weight is heated, the heating environment is difficult to control uniformly due to large space in the furnace, and the heat conductivity coefficient of the titanium alloy is about 1/5 of that of steel, so that the temperature difference in the transverse and longitudinal directions of the thickness exists after the blank is discharged from the furnace. Based on the characteristics of high rebound resilience of gas furnace equipment and titanium materials, the old problem of plate type warping has to be faced during rolling, and rolling mill equipment is damaged when serious, so that the stability of mass production is affected, and the advantage of a steel-titanium combined mode is lost. However, different from the warping of steel, the method for optimizing a single rolling process is difficult to effectively solve the problems of cogging/rough rolling warping and plate shape of the titanium alloy medium plate, and restricts the subsequent process execution and product development.
Disclosure of Invention
In order to overcome the defects caused by the equipment and bring the advantages of the production line into play, the invention provides a plurality of process combination choices, can more flexibly and effectively solve the plate type problems such as hot rolling and warping of titanium alloy with different specifications, and provides preconditions for the subsequent process execution and the realization of the target specification of the finished product.
In order to achieve the above-mentioned purpose, the invention provides a combined treatment method for inhibiting hot rolling warping of a titanium alloy sheet, which can flexibly and effectively solve the problem of warping caused by heating temperature difference in cogging/rough rolling of a medium-thickness titanium alloy sheet, and comprises the following steps:
(1) blank preparation: the titanium alloy plate with the specification of 80-150 multiplied by 500-780 multiplied by L mm (L is the length of the titanium alloy plate) ensures the uniform thickness, 12 edges of the plate blank are chamfered by polishing, and the diagonal difference is less than or equal to 20mm.
(2) Cogging/rough rolling heating: the slab is heated to the temperature by adopting a soaking section in a stepping gas furnace, the heating temperature of the soaking section is 10-20 ℃ below the beta phase transition point of the alloy, and the heating time is calculated according to the thickness of 1.3-1.6 min/mm; due to the characteristics of heating equipment, the temperature in the furnace where the blank is located is uneven, so that the temperature difference exists in the discharge of the blank, and the temperature is actually measured and recorded along the transverse and longitudinal directions of the thickness of the blank by using an infrared temperature measuring gun after the blank is discharged.
(3) The hot rolling warping combination treatment mode comprises the following steps:
mode one: as shown in fig. 1, after the blank is discharged from the furnace, the temperatures at different positions in the thickness direction are different, and the temperature difference gradually decreases along with the extension of the air cooling time. (P1-P5 are temperature change curves corresponding to 5 evenly spaced points in the thickness direction of the blank). Therefore, after the blank is discharged out of the furnace, placing air cooling on a roller way in front of the machine, taking the initial rolling temperature into consideration, and immediately feeding the blank into rolling when the temperature difference of the thickness surface of the blank is reduced to be within 10 ℃; the specific operation is that when the temperature difference of the blank is larger than or equal to 30 ℃, the blank is placed on a roller way for air cooling for 30-40 s, and when the temperature difference of the blank is smaller than 30 ℃, the blank is air cooled for 25-30 s.
Mode two: as shown in figure 2, the temperature change curves P1-P5 after the heating temperature is increased under different blank thicknesses. And (3) in the temperature range not exceeding the alloy phase transition point, raising the temperature of a soaking section in the furnace, placing air cooling on a roller way before the blank is discharged from the furnace, and immediately feeding the blank into rolling when the temperature difference of the thickness surface of the blank is reduced to be within 10 ℃, wherein the specific air cooling time is 45s.
Mode three: when cogging/rough rolling, the tapping condition occurs, equal-diameter asynchronous rolling operation is adopted in the 1 st and 2 nd passes, the rolling speed is 0.628-1.2 m/s, the lower roller speed of the reversible hot rolling mill is set to be more than 0.2rad/s, and asynchronous rolling is canceled after the 3 rd pass; if the warping head which affects the production and is smooth is generated, the process is adjusted to be that the roller speed of the upper roller is more than 0.2rad/s of the roller speed of the lower roller.
Mode four: fig. 3 shows a curve of the simulation law of warpage at different temperature differences and rolling reduction (model temperature is set to be upper surface temperature > lower surface), and the rolling reduction of pass 15% is the inflection point of the curve. The reduction rate of 3 passes before the rolling process is controlled to be less than or equal to 15 percent so as to reduce the influence caused by uneven plastic deformation heat of the titanium alloy plate.
Mode five: if the warp can not be restrained effectively after the mode one to the mode four are combined, the rough rolling is carried out until the thickness of the incoming material is 1/2, and then the rolling is carried out after tempering.
In the rolling process, two or more modes are selected for combined treatment according to the actual measured temperature difference and warping condition.
In the technical scheme, the rolling process in the step (3) is performed for 7-9 times in total, and the heat deformation rate is more than 70%.
Further, when the hot rolling is warped, the cooling water of the roller is closed in the rolling process, so that the serious temperature runaway is prevented.
Compared with the prior art, the invention has the beneficial effects that:
(1) the method can select two or more modes to be combined for treatment according to the actual temperature difference and rolling warping conditions of the titanium alloy plates with different brands, and flexibly and effectively solves the problem of rolling warping/buckling of the titanium alloy.
(2) The combination mode can effectively inhibit rolling warpage caused by heating equipment, has simple overall operation, high flatness after rolling of the plate, reduces the repeated cost of working procedures, improves the production stability, and is a precondition guarantee for the execution of the subsequent process.
Drawings
FIG. 1 is a graph of the thickness section characteristic point cooling profile of a blank of the present invention after being discharged from the furnace;
FIG. 2 is a graph showing characteristic point cooling of a thickness section after the blank heating temperature is increased and discharged;
FIG. 3 is a graph showing the warpage rules for different blank temperature differences and rolling reduction according to the present invention.
Detailed Description
The invention is further illustrated below in connection with specific examples, but is not limited in any way. For the sake of brevity, the raw materials in the following examples are all commercially available products unless otherwise specified, and the methods used are all conventional methods unless otherwise specified.
A combined treatment method for inhibiting hot rolling warpage of a titanium alloy sheet, the method comprising the steps of:
(1) blank preparation: the titanium alloy plate with the specification of 80-150 multiplied by 500-780 multiplied by L mm ensures the thickness uniformity, 12 edges of the plate blank are chamfered by polishing, and the diagonal difference is less than or equal to 20mm.
(2) Cogging/rough rolling heating: the slab is heated to the temperature by adopting a soaking section in a stepping gas furnace, the heating temperature of the soaking section is 10-20 ℃ below the beta phase transition point of the alloy, and the heating time is calculated according to the thickness of 1.3-1.6 min/mm; and after the plate blank is discharged from the furnace, using an infrared temperature measuring gun to measure the temperature along the transverse and longitudinal directions of the thickness of the plate blank and recording.
(3) The hot rolling warping combination treatment mode comprises the following steps:
mode one: placing air cooling on a roller way before a machine after the blank is discharged from a furnace, and immediately feeding the blank into rolling when the temperature difference of the thickness surface of the blank is reduced to be within 10 ℃; the specific operation is that when the temperature difference of the blank is larger than or equal to 30 ℃, the blank is placed on a roller way for air cooling for 30-40 s, and when the temperature difference of the blank is smaller than 30 ℃, the blank is air cooled for 25-30 s;
mode two: in the temperature range not exceeding the beta transformation point of the alloy, the temperature of a soaking section in the furnace is increased, after the blank is discharged from the furnace, air cooling is carried out on a roller way in front of the machine, and when the temperature difference of the thickness surface of the blank is reduced to be within 10 ℃, the blank is immediately sent into rolling, and the specific air cooling time is 45s;
mode three: when cogging/rough rolling, the tapping condition occurs, equal-diameter asynchronous rolling operation is adopted in the 1 st and 2 nd passes, the rolling speed is 0.628-1.2 m/s, the lower roller speed of the reversible hot rolling mill is set to be more than 0.2rad/s, and asynchronous rolling is canceled after the 3 rd pass; if the warping head which affects the smooth production appears, the process is adjusted to be that the roller speed of the upper roller is more than 0.2rad/s of the roller speed of the lower roller;
mode four: the reduction rate of 3 passes before the rolling process is controlled to be less than or equal to 15 percent;
mode five: if the warp cannot be effectively restrained after the mode one to the mode four are combined, the reduction rate of the first 3 passes is continuously reduced, and when the cogging/rough rolling is carried out to the thickness of 1/2 of the incoming material, the rolling is carried out after tempering, and the roller cooling water is closed when the warp is rolled, so that the serious temperature runaway is prevented.
In the rolling process, two or more modes are selected for combined treatment according to the actual measured temperature difference and warping condition.
Example 1
A combined treatment method for inhibiting hot rolling and warping of a titanium alloy plate comprises the following specific technological processes:
the prepared material is TC4 titanium alloy plate, the size specification of the supplied material is 86 multiplied by 670 multiplied by 755mm, and the target thickness is 23mm. Heating in a stepping gas furnace at 950-970 ℃ (in a two-phase region) for 129min until the temperature is reached, and displaying a temperature difference of 30 ℃ in the thickness direction by an online temperature measuring gun after discharging; and after placing air cooling for 25s on a roller way in front of the machine, rapidly biting into the rolling. The reduction rate of the first pass is 10%, the reduction rate of the second pass is 15%, the rolling speed is 1m/s, the rolling speed of the lower roller of the first 2 passes is more than the rolling speed of the upper roller by 0.3rad/s, the asynchronous rolling is started to be canceled in the 3 rd pass, and the cooling water is closed in the whole process. After the rolling is finished, the plate shape is good, and no obvious tap appears.
Example 2
A combined treatment method for inhibiting hot rolling and warping of a titanium alloy plate comprises the following specific technological processes:
the material TA15 titanium alloy plate is prepared, the size specification of the material is 93X 655X 725mm, and the target thickness is 24mm. Heating in a stepping gas furnace at 940-960 deg.c (10-20 deg.c below the phase transition point) for 135min to obtain the temperature difference of 35 deg.c; and after the rolling mill is placed on a roller way in front of the rolling mill for 35s, the rolling mill is rapidly bitten into the rolling mill. The first pass rolling rate is 5%, the 2 nd pass rolling rate is 10%, the rolling speed is 0.628m/s, the rolling speed of the first 2 passes lower roller is larger than the rolling speed of the upper roller by 0.2rad/s, the 3 rd pass starts to cancel asynchronous rolling, and after the rolling is carried out to 50mm, the second pass is normally rolled to the target thickness after being heated by a furnace return, and the roller cooling water is closed in the whole process. After the rolling is finished, the plate shape is good, and the defects of initial warping are eliminated.
Example 3
A combined treatment method for inhibiting hot rolling and warping of a titanium alloy plate comprises the following specific technological processes:
the pure titanium plate is prepared, the size specification of the incoming material is 100 multiplied by 580 multiplied by 750mm, and the target thickness is 20mm. Heating in a stepping gas furnace at 840-860 ℃ (10-20 ℃ below the phase transition point) for 130min until the temperature is reached, and displaying a temperature difference of 30 ℃ in the thickness direction by an online temperature measuring gun after discharging; and after the rolling mill is placed on a roller way in front of the rolling mill for 30 seconds, the rolling mill is rapidly bitten into the rolling mill. The first pass reduction rate is 13%, the roller cooling water is closed in the whole process, and after rolling is finished, the plate shape is good and the flatness is high.
Comparative example 1
The stock TC4 titanium alloy plate material has the incoming material specification of 86 multiplied by 650 multiplied by 625mm and the target thickness of 23mm. The heating temperature is 950-970 ℃ (in the two-phase region), the heating time is 129min, the temperature difference between the upper surface and the lower surface is 32 ℃ after discharging, and the temperature is quickly transferred to a rolling mill to be bitten into the rolling after discharging. The reduction rate of the first pass is 10%, the reduction rate of the second pass is 15%, when the second pass is rolled, the severe head knocking condition occurs, the roller way is impacted, and the production is stopped.
Examples 1 to 3 and comparative example 1 were obtained by rolling titanium alloy billets of different specifications and grades by heating in a step gas furnace. In the embodiments 1, 2 and 3, 2 to 3 combination modes are selected for treatment according to the specification of the blank and the actual temperature difference of the discharging, so that the tapping condition caused by the temperature difference of the discharging of the blank is effectively improved, and the cost of repeated working procedures is reduced. And when the temperature difference exists in the discharging of the blank in the comparative example 1, the blank is executed in a single processing mode, and the common plate type problem still exists.
Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art without departing from the scope of the technology, or the technology can be modified to be equivalent. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention shall still fall within the scope of the technical solution of the present invention.
Claims (3)
1. A combined treatment method for inhibiting hot rolling warpage of a titanium alloy sheet, the method comprising the steps of:
(1) blank preparation: the titanium alloy plate with the specification of 80-150 multiplied by 500-780 multiplied by L mm ensures the thickness uniformity, 12 edges of the plate blank are chamfered by polishing, and the diagonal difference is less than or equal to 20mm;
(2) cogging/rough rolling heating: heating the plate blank by adopting a soaking section in a stepping gas furnace to a temperature of 10-20 ℃ below the alloy phase transition point, wherein the heating time is calculated according to the thickness of 1.3-1.6 min/mm; after the plate blank is discharged from the furnace, using an infrared temperature measuring gun to measure the temperature along the transverse and longitudinal directions of the thickness of the plate blank and recording;
(3) the hot rolling warping combination treatment mode comprises the following steps:
mode one: placing air cooling on a roller way before a machine after the blank is discharged from a furnace, and immediately feeding the blank into rolling when the temperature difference of the thickness surface of the blank is reduced to be within 10 ℃; the specific operation is that when the temperature difference of the blank is larger than or equal to 30 ℃, the blank is placed on a roller way for air cooling for 30-40 s, and when the temperature difference of the blank is smaller than 30 ℃, the blank is air cooled for 25-30 s;
mode two: in the temperature range not exceeding the beta transformation point of the alloy, the temperature of a soaking section in the furnace is increased, after the blank is discharged from the furnace, air cooling is carried out on a roller way in front of the machine, and when the temperature difference of the thickness surface of the blank is reduced to be within 10 ℃, the blank is immediately sent into rolling, and the specific air cooling time is 45s;
mode three: when cogging/rough rolling, the tapping condition occurs, equal-diameter asynchronous rolling operation is adopted in the 1 st and 2 nd passes, the rolling speed is 0.628-1.2 m/s, the lower roller speed of the reversible hot rolling mill is set to be more than 0.2rad/s, and asynchronous rolling is canceled after the 3 rd pass; if the warping head which affects the smooth production appears, the process is adjusted to be that the roller speed of the upper roller is more than 0.2rad/s of the roller speed of the lower roller;
mode four: the reduction rate of 3 passes before the rolling process is controlled to be less than or equal to 15 percent;
mode five: if the warp can not be restrained effectively after the mode one to the mode four are combined, rough rolling is carried out until the thickness of the incoming material is 1/2, and rolling is carried out after tempering;
in the rolling process, two or more modes are selected for combined treatment according to the actual measured temperature difference and warping condition.
2. The method according to claim 1, wherein the rolling process of step (3) is performed for 7 to 9 passes in total, and the heat distortion rate is more than 70%.
3. The method of claim 1, wherein the rolling process shuts off the roll cooling water when the hot rolling is warped.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN119040616A (en) * | 2024-08-16 | 2024-11-29 | 武汉科技大学 | Method for avoiding warping of hot-rolled high-strength steel plate under high-temperature coiling condition |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119040616A (en) * | 2024-08-16 | 2024-11-29 | 武汉科技大学 | Method for avoiding warping of hot-rolled high-strength steel plate under high-temperature coiling condition |
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