CN104550252A - Differentiation control method for mechanical properties of rolled unequal-thickness plates - Google Patents
Differentiation control method for mechanical properties of rolled unequal-thickness plates Download PDFInfo
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- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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Abstract
The invention discloses a differentiation control method for the mechanical properties of rolled unequal-thickness plates. The method includes the steps of firstly, selecting the lowest strength of a target product as the standard reference value of the mechanical properties of raw materials, and selecting the thickness of the thickest area of the target product as the standard thickness value of the raw material thickness; secondly, selecting strip steel with the required thickness and the required mechanical properties as the raw materials, conducting continuous rolling on the raw materials to obtain the rolled unequal-thickness plates meeting the requirements for the sizes of finished products, and selecting the appropriate annealing process to conduct annealing according to the property differentiation requirements of target product so as to make the target product meet the standard requirements. According to the actual requirements, the chemical properties of unequal-thickness areas of the rolled unequal-thickness plates are controlled, the rolled unequal-thickness plates which are made of the same materials but have different chemical properties are obtained, and therefore the application range of the rolled unequal-thickness plates is widened, and more design space is provided for automobile designers.
Description
Technical field
The invention belongs to metal mill product technical field, be specifically related to a kind of rolling difference thick plate mechanics poor performance alienation control method.
Background technology
At present, in automobile industry application widely, most typical poor slab is exactly laser assembly solder plate to difference slab.Laser tailor welded blanks by the Plate Welding of different-thickness, unlike material, different performance together, as punching parts motherboard, thus significantly can reduce vehicle weight.
Because laser assembly solder plate commissure exists the harmful effect such as thickness, performance sudden change, so relevant scholar's research exploitation thickness continually varying sheet material.The continuous rolling difference slab developed at the beginning of 21 century becomes one of focus of automobile industry concern, its approach utilizes the method for rolling directly to produce periodic variable-thickness band steel, longitudinal variable-thickness sheet material (TRB is become after crosscut, Tailor Rolled Blank), be called for short difference slab or TRB plate, as shown in Figure 1).Difference slab has the following advantages compared with laser assembly solder plate: 1. eliminate welding sequence, can reduce production cost; 2. consecutive production, production efficiency is high, processing ease, good reliability; 3. do not have weld seam, surface quality is good; 4. replace weld seam by transition region, bonding strength improves, and the uniformity of performance increases substantially; 5. THICKNESS CONTROL is easy, can produce the sheet material of more than two kinds thickness combinations easily; 6. the length in thickness transitions district and shape can control, and force-bearing situation when can be on active service according to stamping parts, the length in design transition district and the relation curve of transition region thickness and position, this is that laser assembly solder plate is not accomplished.
Both at home and abroad round theoretical research and the main control being still confined to gauge of exploitation of difference slab.Differentiation about difference slab different-thickness region mechanical property controls, and does not also see relevant bibliographical information both at home and abroad.Be rolled in the experiment of poor slab and production process, find that poor mechanical property Phenomenon of Alienation has appearred in the tapering plate after annealing, this patent, by the technological process of production for continuous rolling difference slab, proposes the production control method of the low cost mechanical property differentiation rolling difference slab under cold-rolling process flow process.
Summary of the invention
The object of the invention is the process control method under exploitation cold-rolling process flow process, according to the actual requirements, the mechanical property in controlled rolling difference slab different-thickness region, obtain the rolling difference slab with material different mechanical properties, thus expand the range of application of rolling difference slab, for Automobile Design teacher provides more design space.
Technical scheme of the present invention is:
A kind of rolling difference thick plate mechanics poor performance alienation control method, comprises the steps:
(1) benchmark that raw material are chosen is determined
After determining that the specifications and characteristics differentiation of target product (i.e. rolling difference slab) requires, choose the root thickness value of thickness as material stock thickness in the thickest region of target product; Choose the reference value of the minimum intensity in target product (i.e. rolling difference slab) as raw material mechanical property (generally for the Design of Auto Parts, the thinnest region is minimum to requirement of strength, thick district wants high to requirement of strength), namely using the minimum yield strength of target product as raw-material yield strength reference value, using the minimum tensile strength of target product as raw-material tensile strength reference value, using the minimum percentage elongation of target product as raw-material percentage elongation reference value;
(2) raw material are chosen
The reference value of raw material mechanical property (comprising yield strength, tensile strength and percentage elongation etc.) determined according to step (1) and the root thickness value of material stock thickness, select the band steel of desired thickness and mechanical property as raw material, selection principle is: raw material yield strength >=raw-material yield strength reference value, raw material tensile strength >=raw-material tensile strength reference value, raw material percentage elongation >=raw-material percentage elongation reference value; Root thickness value≤material stock thickness≤1.25 times root thickness value;
(3) according to the dimensional requirement of target product, continuous rolling is carried out to raw material, shut out the rolling difference slab strictly meeting finished size requirement by a passage.
(4) according to the poor performance alienation requirement of target product, select suitable annealing process to carry out annealing in process, according to mechanical property differentiation feature, be divided into following several situation:
1. its thin district intensity of target product is high, thick district the intensity low difference of dinger thickness district intensity and thin district intensity (be exceed 10% of thick district intensity): detect rolling process complete after rolling difference thick plate mechanics performance, if the mechanical index such as thin district intensity and percentage elongation meet standard-required, then sheet material do not need to heat-treat (thick district due to deformation rate very little, its index such as intensity and percentage elongation is general all within standard-required), directly carry out step (5).
2. its thin district intensity of target product is low, thick district the intensity high difference of dinger thickness district intensity and thin district intensity (be exceed 10% of thin district intensity): according to the deformation rate in thin district, select rational annealing process, this annealing process should meet: difference slab thin district part can carry out perfect recrystallization, and thick district can only be in partial annealing district or stress relief annealing district.Show according to great many of experiments, for same original thickness, adopt the target that different reduction ratio obtains, its critical recrystallization annealing temperature reduces along with the increase of reduction ratio, this means the product of different-thickness, if annealing temperature selection is suitable, thin district can be met and be in perfect recrystallization, and thick district can only be in partial annealing district or stress relief annealing district, it is high that this just can realize thick district intensity, and the designing requirement that thin district intensity is low.By this process, thin district is owing to producing recrystallization, and the index such as intensity and percentage elongation is adjusted near the mechanical property of material plate; Thick district is owing to carrying out perfect recrystallization, and its work hardening cannot be eliminated completely, and corresponding crystal grain is still in semi-harden state, thus its intensity is still very high, but percentage elongation makes moderate progress than sclerosis state.Comparing detecting the thin district that obtains and thickness mechanical property numerical value and a reference value, if intensity is higher, percentage elongation is on the low side, suitably can improve annealing temperature, until meet the demands.If low strength, percentage elongation have allowance, then suitably reduce annealing temperature, reduce temperature retention time, until intensity and percentage elongation meet standard-required.
3. its thin district intensity of target product and thick district intensity are more or less the same the difference of dinger thickness district intensity and thin district intensity (be do not exceed 10% of thin district intensity): according to the deformation rate in thin district, select high-temperature annealing process, and high-temperature holding time proper extension, until Bao Qu and thick district can both meet perfect recrystallization requirement.Comparing detecting the thin district that obtains and thickness mechanical property numerical value and a reference value, if intensity is higher, percentage elongation is on the low side, suitably can improve annealing temperature, until meet the demands.If low strength, percentage elongation have allowance, then suitably reduce temperature retention time, until intensity and percentage elongation meet standard-required.
(5) for the mechanical property differentiation requirement of production board, carry out the smooth and straightening processing in local, mechanical property is finely tuned.
Through the rolling difference slab that step (3) obtains, if its mechanical property meets standard-required, then directly carry out shearing packaging.If intensity level is on the low side, then need to carry out as the case may be micro-whole, specific as follows:
①Bao district strength ratio standard value is slightly low, then adjust by thin district is smooth.The reduction ratio taked due to flattening process is very little, general about 0.5% ~ 1.5%, it affects very little on the thickness deviation of production board and length tolerance, size can not be caused to exceed the tolerance of production board, but be improved because this deformation rate can make to be flattened yield strength partly, increasing amount is roughly at 15-40MPa, local can be carried out so smooth for thin district part, thus improve the intensity in thin district, and do not affect other indexs such as percentage elongation, make it to meet standard-required.
②Bao district intensity and thick district intensity all on the low side, all adopt smooth operation to adjust to these two parts, suitably improve this two parts intensity, and do not affect other indexs such as percentage elongation, make it to meet standard-required.
③Hou district strength ratio standard value is slightly low, then adjust by thick district is smooth.The reduction ratio taked due to flattening process is very little, general about 0.5% ~ 1.5%, it affects very little on the thickness deviation of production board and length tolerance, size can not be caused to exceed the tolerance of production board, but be improved because this deformation rate can make to be flattened yield strength partly, increasing amount is roughly at 15-40MPa, local can be carried out so smooth for thick district part, thus improve the intensity in thick district, and do not affect other indexs such as percentage elongation, make it to meet standard-required.
(6) to gained mechanics performance difference meet standard rolling difference slab shear and blanking process.In two kinds of situation: as fruit product does not carry out last smooth aligning, then its length dimension meets production board requirement completely, directly carries out shearing; And to have carried out smooth and aligning as fruit product, although its each several part length all meets production board tolerance, but its cumulative length or several millimeter slightly longer than production board, so finally need to carry out blanking process by blanking die by shearing the sheet material obtained, trial-production meets production board length requirement.
The inventive method principle is as follows:
According to the mechanical property differentiation feature of rolling difference slab, rolling difference slab is divided into three types, as Suo Shi Fig. 2 (a)-(c) (for two sections of rolling difference slabs).
The cold-rolling production process flow process of continuous rolling difference slab is as follows: continuous variable cross section rolling → heat treatment → smooth or aligning → shearing.In these technological processes, the step that can have an impact to mechanical property is first three, and wherein the operation of rolling is work hardening substantially, and heat treatment process is softening, and smooth straightening process is for eliminating Lv get Si band or improving mechanical property.
The different rolling difference slab of thickness is rolled into from original equal thickness material, mean that the reduction ratio that production board different-thickness is corresponding is different, thus after rolling process completes, the work-hardening capacity that its each thickness position is corresponding is different, finished plate thickness is thicker, its work-hardening capacity is less, and finished plate thickness is thinner, and its work-hardening capacity is larger.According to the stress strain curve analysis of Fig. 3, after rolling process, the mechanical property difference that rolling difference each position of slab is corresponding.
Analyze the mechanical property requirements of production board different-thickness, choose wherein for the minimum thickness area of requirement of strength as raw material mechanical property reference (generally to the Design of Auto Parts, the thinnest region is minimum to requirement of strength, thick district wants high to requirement of strength), the reference of the thickness then choosing the thickest region of production board material stock thickness the most.Again according to mechanical property reference and root thickness reference, select suitable raw material according to above-mentioned steps (2) selection principle.For above-mentioned requirements, according to the product standard of each big steel enterprise, and the requirement of client, select the raw material of appropriate size.
Rolling difference thick plate mechanics performance difference metallization processes control method has following several path:
(1) under the finished size determined and appointed condition, the important parameters such as optimal design material stock thickness (reduction ratio design), intensity and percentage elongation, for follow-up processing route is selected to lay the foundation;
(2) specifications of raw materials design+rolled hardening+Technology for Heating Processing scheme path;
(3) specifications of raw materials design+rolled hardening+Technology for Heating Processing+flattening process path, local;
(4) specifications of raw materials design+rolled hardening+Technology for Heating Processing+rolled hardening processing route.
Beneficial effect of the present invention is as follows:
1, the present invention can according to the differentiation feature of the mechanical property of rolling difference slab, the control method that flexible design is different, produce the poor slab meeting the Design of Auto Parts personnel requirement, thus obtain the rolling difference slab of same material, different mechanical properties, expand the range of application of rolling difference slab.
2, the inventive method is applicable to the alienation of production intensity poor performance within 120MPa, all size vehicle differential slab parts of difference thickness rate within 1:2.
Accompanying drawing explanation
Fig. 1 is periodic variable-thickness band steel schematic diagram.
Fig. 2 is rolling difference thick plate mechanics poor performance alienation feature; Wherein: (a) thin district intensity is high, and thick district intensity is low; B () thin district intensity Di Hou district intensity is high; (c) thin district intensity and thick district intensity difference little.
Fig. 3 is stress strain curve schematic diagram.
Fig. 4 is the embodiment of the present invention 1 rolling difference slab specification.
Detailed description of the invention
Embodiment 1
Produce two sections of rolling difference slabs as shown in Figure 4, design parameter: thick district: 2mm is thick, 85mm is long; Transition region: 100mm is long; Thin district: 1mm is thick, 688mm is long.Material HC340.Thin district yield strength requires between 340MPa ~ 420MPa, percentage elongation more than 22%; Thick district yield strength requires at more than 400MPa, and the upper limit does not do requirement, percentage elongation more than 20%.
(1) according to the thickness of production board, thick is 2mm, root thickness is 2mm, material yield strength requirement >=340MPa, percentage elongation >=22%, then according to a reference value requirement, selection material stock thickness is 2.0mm ~ 2.5mm, if raw thickness is too large, Ze Bao district percentage pass reduction equals 60%, deformation rate is unfavorable for too being greatly shaped, if raw thickness is 2mm, because raw material is generally negative common difference, so raw thickness may be less than 2mm, be unfavorable for the THICKNESS CONTROL in thick district, consider, raw material original thickness is decided to be 22mm.Steel plate material elects the CR340LA of Baosteel company standard as, its yield strength at 340 ~ 420MPa, tensile strength >=410MPa, percentage elongation >=22%.
(2) according to the size of drawing requirement, steel plate is made for poor slab, thin district thickness is between 0.96-1.04mm, and thick district thickness is between 1.96-2.04, and each zone length precision all controls according to dimensional requirement.(3) calculate thin district reduction ratio, its numerical value, close to 55%, by test, obtains its perfect recrystallization temperature more than 600 DEG C, temperature retention time 4 hours ~ 8 hours.And this annealing process, thick district is in incomplete recrystallization section.Initial annealing process locates 620 DEG C, temperature retention time 6 hours, the thin district now obtained along its length yield strength is 325 ~ 336MPa, tensile strength 401 ~ 406MPa, percentage elongation 28% ~ 31%, thick district along its length yield strength is 413 ~ 418MPa, tensile strength 469 ~ 474MPa, percentage elongation 26% ~ 28%, can find out under this annealing process, thin district intensity is slightly lower than standard value, thick district mechanical property meets standard-required, in this case, suitable reduction annealing temperature is to 600 DEG C, temperature retention time 6 hours, the thin district now obtained along its length yield strength is 367 ~ 370MPa, tensile strength 430-438MPa, percentage elongation 28%-30%, thick district along its length yield strength is 436 ~ 444MPa, tensile strength 488-490MPa, percentage elongation 26%-28%, can find out under this annealing process, thin district mechanical property and thickness mechanical property all meet standard-required,
(4) because first three operation meets product requirement, the smooth cancellation of this 4th operation, only aligns;
(5) shear according to length dimension required precision, the mechanical property differentiation rolling difference slab of requirement can be obtained.
Claims (5)
1. a rolling difference thick plate mechanics poor performance alienation control method, is characterized in that: the method comprises the steps:
(1) benchmark that raw material are chosen is determined:
After determining that the specifications and characteristics differentiation of target product requires, choose the root thickness value of thickness as material stock thickness in the thickest region of target product; Choose the reference value of minimum intensity as raw material mechanical property of target product, namely using the minimum yield strength of target product as raw-material yield strength reference value, using the minimum tensile strength of target product as raw-material tensile strength reference value, using the minimum percentage elongation of target product as raw-material percentage elongation reference value;
(2) raw material are chosen:
The reference value of raw material mechanical property determined according to step (1) and the root thickness value of material stock thickness, select the band steel of desired thickness and mechanical property as raw material, selection principle is: raw material yield strength >=raw-material yield strength reference value, raw material tensile strength >=raw-material tensile strength reference value, raw material percentage elongation >=raw-material percentage elongation reference value; Root thickness value≤material stock thickness≤1.25 times root thickness value;
(3) according to the dimensional requirement of target product, continuous rolling is carried out to raw material, shut out the rolling difference slab meeting finished size requirement by a passage.
(4) according to the poor performance alienation requirement of target product, select suitable annealing process to carry out annealing in process to the sheet material after step (3) rolling, be specifically divided into following several situation:
1. its thin district intensity of target product is high, and thick district intensity is low: the rolling difference thick plate mechanics performance after detection rolling process completes, if thin district mechanical property meets standard-required, then sheet material does not need to heat-treat, and directly carries out step (5);
2. its thin district intensity of target product is low, thick district intensity is high: according to the deformation rate in thin district, select rational annealing process, this annealing process should meet: difference slab thin district part can carry out perfect recrystallization, and thick district can only be in partial annealing district or stress relief annealing district;
3. its thin district intensity of target product and thick district intensity are more or less the same: according to the deformation rate in thin district, select high-temperature annealing process, and high-temperature holding time proper extension, until Bao Qu and thick district can both meet perfect recrystallization requirement.
(5) through the rolling difference slab that step (3) obtains, if its mechanical property meets standard-required, then shearing packaging is directly carried out; If intensity level is on the low side, then for the mechanical property differentiation requirement of production board, by the smooth and straightening processing in local, its mechanical property is finely tuned, makes it to meet standard-required.
(6) to gained mechanics performance difference meet standard rolling difference slab shear and blanking process.
2. rolling difference thick plate mechanics poor performance alienation control method according to claim 1, it is characterized in that: when 2. step (4) the plants situation, after annealing, compare detecting the Bao Qu that obtains and thick field forces performance value and a reference value, if intensity is higher, percentage elongation is on the low side, need suitably to improve annealing temperature, until meet the demands; If low strength, percentage elongation have allowance, then suitably reduce annealing temperature, reduce temperature retention time, until intensity and percentage elongation meet standard-required.
3. rolling difference thick plate mechanics poor performance alienation control method according to claim 1, it is characterized in that: in step (4), 3. plant situation, when its thin district intensity of target product and thick district intensity are more or less the same, after high-temperature annealing process is implemented to the sheet material of rolling, compare detecting the thin district that obtains and thickness mechanical property numerical value and a reference value, if intensity is higher, percentage elongation is on the low side, then suitably improve annealing temperature, until meet the demands; If low strength, percentage elongation have allowance, then suitably reduce annealing temperature, reduce temperature retention time, until intensity and percentage elongation meet standard-required.
4. rolling difference thick plate mechanics poor performance alienation control method according to claim 1, is characterized in that: the detailed process that the rolling difference slab obtained step (3) in step (5) carries out mechanical property fine setting is as follows:
①Bao district strength ratio standard value is slightly low, then adjust by thin district is smooth; The reduction ratio that flattening process is taked is 0.5% ~ 1.5%;
②Bao district intensity and thick district intensity all on the low side, all adopt smooth operation to adjust to these two parts, improve this two parts yield strength and tensile strength, and do not affect percentage elongation, make it to meet standard-required;
③Hou district strength ratio standard value is slightly low, then adjust by thick district is smooth, and the reduction ratio that flattening process is taked is about 0.5% ~ 1.5%.
5. rolling difference thick plate mechanics poor performance alienation control method according to claim 1, is characterized in that: in step (6): as fruit product does not carry out last smooth aligning, then its length dimension meets production board requirement completely, directly carries out shearing; And to have carried out smooth and aligning as fruit product, although its each several part length all meets production board tolerance, but its cumulative length or several millimeter slightly longer than production board, so finally need to carry out blanking process by blanking die by shearing the sheet material obtained, trial-production meets production board length requirement.
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| CN107716550A (en) * | 2017-09-09 | 2018-02-23 | 首钢集团有限公司 | A kind of production method of low-alloy longitudinal thickness-variable steel plate |
| CN111344074A (en) * | 2017-10-10 | 2020-06-26 | 奥托库姆普联合股份公司 | Method for local cold deformation of steel with uniform thickness |
| CN111539071A (en) * | 2020-04-27 | 2020-08-14 | 武汉工程大学 | Differential thickness plate crystal plasticity constitutive model establishing method and system and electronic equipment |
| CN111996462A (en) * | 2020-09-07 | 2020-11-27 | 鞍钢股份有限公司 | Longitudinal variable-thickness ultrahigh-strength ship board and production method thereof |
| CN112692147A (en) * | 2020-12-07 | 2021-04-23 | 广东石油化工学院 | Intelligent drawing control system and method for rolled differential-thickness plate box-shaped piece |
| CN112718876A (en) * | 2020-12-22 | 2021-04-30 | 上海宝钢新材料技术有限公司 | Production process of cold-formed low-alloy high-strength steel variable-thickness plate |
| CN113695398A (en) * | 2021-09-01 | 2021-11-26 | 苏州东宝海星金属材料科技有限公司 | Manufacturing method of stainless steel rolled differential thickness plate related product |
| JP7468952B1 (en) | 2023-04-27 | 2024-04-16 | 燕山大学 | Design method for improving the elongation ratio of metal strips with different thicknesses |
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| CN107716550A (en) * | 2017-09-09 | 2018-02-23 | 首钢集团有限公司 | A kind of production method of low-alloy longitudinal thickness-variable steel plate |
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| CN111539071A (en) * | 2020-04-27 | 2020-08-14 | 武汉工程大学 | Differential thickness plate crystal plasticity constitutive model establishing method and system and electronic equipment |
| CN111996462A (en) * | 2020-09-07 | 2020-11-27 | 鞍钢股份有限公司 | Longitudinal variable-thickness ultrahigh-strength ship board and production method thereof |
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| CN112692147A (en) * | 2020-12-07 | 2021-04-23 | 广东石油化工学院 | Intelligent drawing control system and method for rolled differential-thickness plate box-shaped piece |
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| CN112718876A (en) * | 2020-12-22 | 2021-04-30 | 上海宝钢新材料技术有限公司 | Production process of cold-formed low-alloy high-strength steel variable-thickness plate |
| CN113695398A (en) * | 2021-09-01 | 2021-11-26 | 苏州东宝海星金属材料科技有限公司 | Manufacturing method of stainless steel rolled differential thickness plate related product |
| JP7468952B1 (en) | 2023-04-27 | 2024-04-16 | 燕山大学 | Design method for improving the elongation ratio of metal strips with different thicknesses |
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