CN104550252B - Rolling difference thick plate mechanics poor performance alienation control method - Google Patents
Rolling difference thick plate mechanics poor performance alienation control method Download PDFInfo
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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
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Abstract
The invention discloses a kind of rolling difference thick plate mechanics poor performance alienation control method, first the method chooses the minimum intensity reference value as raw material mechanical property of target product, chooses the thickness root thickness value as material stock thickness in the thickest region of target product；Then select the band steel of desired thickness and mechanical property as raw material, raw material continuous rolling is shut out the rolling difference slab meeting finished size requirement, further according to the poor performance alienation requirement of target product, select suitable annealing process to carry out annealing and be allowed to meet standard-required.The present invention according to the actual requirements, the mechanical property in controlled rolling difference slab different-thickness region, it is thus achieved that with the rolling difference slab of material different mechanical properties, thus expand the range of application of rolling difference slab, provide more design space for Automobile Design teacher.
Description
Technical field
The invention belongs to metal mill product technical field, be specifically related to a kind of rolling difference thick plate mechanics performance difference
Change control method.
Background technology
At present, difference slab is applied widely in automobile industry, and most typical poor slab is exactly laser assembly solder plate.
Laser tailor welded blanks can by different-thickness, unlike material, different performance Plate Welding together, as
Punching parts motherboard, thus vehicle weight is greatly lowered.
Owing to 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.Garage is become at the continuous rolling difference slab developed at the beginning of 21 century
One of focus that industry is paid close attention to, its approach is that the method utilizing rolling is directly produced out periodic variable-thickness band steel, horizontal
Become longitudinal variable-thickness sheet material (TRB, Tailor Rolled Blank) after cutting, be called for short difference slab or TRB
Plate, as shown in Figure 1).Difference slab has the advantage that compared with laser assembly solder plate and 1. eliminates Welder
Sequence, it is possible to decrease production cost；2. consecutive production, production efficiency height, processing ease, good reliability；3. do not have
Having weld seam, surface quality is good；4. replacing weld seam by transition region, bonding strength improves, and the uniformity of performance is significantly
Degree improves；5. THICKNESS CONTROL is easy, can produce the sheet material of more than two kinds thickness combinations easily；6. thickness
The length of transition region and shape can control, force-bearing situation when can be on active service according to stamping parts, design transition district
The relation curve of length and 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.Close
Differentiation in difference slab different-thickness region mechanical property controls, and does not sees relevant document report
Road.Carrying out rolling in the experiment of poor slab and production process, the tapering plate after discovery annealing occurs in that mechanics
Poor performance Phenomenon of Alienation, this patent, by the technological process of production for continuous rolling difference slab, proposes cold-rolling process
The production control method of the low cost mechanical property differentiation rolling difference slab under flow process.
Summary of the invention
It is an object of the invention to develop the process control method under cold-rolling process flow process, according to the actual requirements, control
The mechanical property in rolling difference slab different-thickness region, it is thus achieved that with the rolling difference slab of material different mechanical properties,
Thus expand the range of application of rolling difference slab, provide more design space for Automobile Design teacher.
The technical scheme is that
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 the specifications and characteristics differentiation requirement of target product (i.e. rolling difference slab), choose target product
The thickness in the thickest region is as the root thickness value of material stock thickness；Choose target product (i.e. rolling difference slab)
In minimum intensity as raw material mechanical property reference value (typically for the Design of Auto Parts,
The thinnest region is minimum to requirement of strength, and requirement of strength is wanted height by thick district), i.e. the minimum surrender with target product is strong
Spend 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 elongation percentage of target product as raw-material elongation percentage reference
Value；
(2) raw material are chosen
(yield strength, tensile strength and elongation percentage is included according to the raw material mechanical property that step (1) determines
Deng) reference value and the root thickness value of material stock thickness, select desired thickness and the band steel of mechanical property
As raw material, selection principle is: raw material yield strength >=raw-material yield strength reference value, former
Tensile strength >=raw-material tensile strength reference value, raw material elongation percentage >=raw-material elongation percentage
Reference value；Root thickness value≤material stock thickness≤1.25 times root thickness value；
(3) according to the dimensional requirement of target product, raw material are carried out continuous rolling, shut out by a passage
Strictly meet the rolling difference slab of finished size requirement.
(4) according to the poor performance alienation requirement of target product, suitable annealing process is selected to carry out at annealing
Reason, according to mechanical property differentiation feature, is divided into following several situation:
1. its thin district intensity of target product is high, and thick district intensity is low (is that dinger thickness district intensity is super with the difference of thin district intensity
The 10% of Chu Hou district intensity): detect the rolling difference thick plate mechanics performance after rolling process completes, if thin district is strong
Degree and the mechanical index such as elongation percentage meet standard-required, then sheet material is made without being heat-treated that (thick district is due to deformation
Rate is the least, and its index such as intensity and elongation percentage is general all within standard-required), directly carry out step (5).
2. its thin district intensity of target product is low, and thick district intensity is high (is that dinger thickness district intensity is super with the difference of thin district intensity
The 10% of Chu Bao district intensity): according to the deformation rate in thin district, selecting rational annealing process, this annealing process should
This meets: difference slab thin district part can carry out perfect recrystallization, and thick district can be only in partial annealing district or
Stress relief annealing district.Show according to great many of experiments, for same original thickness, use different reduction ratio to obtain
Target, its critical recrystallization annealing temperature reduces along with the increase of reduction ratio, it means that the product of different-thickness
Product, if annealing temperature selects properly, will disclosure satisfy that thin district is in perfect recrystallization, and thick district can be only in
Partial annealing district or stress relief annealing district, it is high that this can be realized as thick district intensity, and the design that thin district intensity is low
Requirement.By this process, thin district is owing to producing recrystallization, and the index such as intensity and elongation percentage is adjusted to raw material plate
Near the mechanical property of material；Thick district is owing to cannot be carried out perfect recrystallization, and its processing hardening cannot be completely eliminated,
Corresponding crystal grain is still in semi-harden state, thus its intensity is the highest, but elongation percentage makes moderate progress than hardening state.
Thin district detection obtained and thickness mechanical property numerical value and a reference value compare, if intensity is higher, extension
Rate is on the low side, can properly increase annealing temperature, until meeting requirement.If low strength, elongation percentage have abundant
Amount, the most suitably reduces annealing temperature, reduces temperature retention time, until intensity and elongation percentage meet standard-required.
3. its thin district intensity of target product and thick district intensity are more or less the same (is the difference of dinger thickness district intensity and thin district intensity
Value is without departing from the 10% of thin district intensity): according to the deformation rate in thin district, select high-temperature annealing process, and high temperature dwell
Temperature time proper extension, until Bao Qu and thick district can meet perfect recrystallization requirement.Detection obtained is thin
District and thickness mechanical property numerical value and a reference value compare, if intensity is higher, elongation percentage is on the low side, and Ke Yishi
When improving annealing temperature, until meeting requirement.If low strength, elongation percentage have allowance, the most suitably reduce guarantor
The temperature time, until intensity and elongation percentage meet standard-required.
(5) for the mechanical property differentiation requirement of production board, partly flat and straightening processing is carried out, to power
Performance is finely adjusted.
Through the rolling difference slab that step (3) obtains, if its mechanical property meets standard-required, the most directly enter
Row shears 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 lower, then be adjusted by thin district is smooth.Owing to flattening process is taked
Reduction ratio is the least, and typically 0.5%～about 1.5%, thickness deviation and the length tolerance of production board are affected very by it
Little, do not result in the size tolerance beyond production board, but owing to this deformation rate can make to be flattened bending of part
Taking intensity to be improved, raising amount, substantially at 15-40MPa, so can carry out local for thin district part flat
Whole, thus improve the intensity in thin district, and do not affect other indexs such as elongation percentage, it is allowed to meet standard-required.
②Bao district intensity and thick district intensity are the most on the low side, all use smooth operation to be adjusted, suitably these two parts
Improve this two parts intensity, and do not affect other indexs such as elongation percentage, be allowed to meet standard-required.
③Hou district strength ratio standard value is slightly lower, then district is smooth is adjusted by thick.Owing to flattening process is taked
Reduction ratio is the least, and typically 0.5%～about 1.5%, thickness deviation and the length tolerance of production board are affected very by it
Little, do not result in the size tolerance beyond production board, but owing to this deformation rate can make to be flattened bending of part
Taking intensity to be improved, raising amount, substantially at 15-40MPa, so can carry out local for thick district part flat
Whole, thus improve the intensity in thick district, and do not affect other indexs such as elongation percentage, it is allowed to meet standard-required.
(6) the rolling difference slab that gained mechanics performance difference meets standard is sheared and blanking process.
In two kinds of situation: do not carry out last smooth aligning such as fruit product, then its length dimension fully meets production board
Requirement, directly carries out shearing；And as fruit product has carried out smooth and aligning, although its each several part length is all
Meet production board tolerance, but its cumulative length or the longest several millimeters than production board, so by shearing
The sheet material obtained finally needs to carry out blanking process by blanking die, and 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, such as figure
Shown in 2 (a)-(c) (as a example by 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 → be heat-treated → smooth
Or aligning → shear.In these technological processes, it is possible to the step that mechanical property produces impact is first three,
Wherein the operation of rolling essentially processes hardening, and heat treatment process is for softening, and smooth straightening process is for eliminating Lv get Si
Carry or improve mechanical property.
It is rolled into the rolling difference slab that thickness is different, it is meant that production board different-thickness pair from original equal thickness material
The reduction ratio answered is different, thus after rolling process completes, the work-hardening capacity that its each thickness position is corresponding
Difference, finished plate thickness is the thickest, and its work-hardening capacity is the least, and finished plate thickness is the thinnest, its processing hardening journey
Spend the biggest.Stress strain curve analysis according to Fig. 3, after rolling process, the power that rolling difference each position of slab is corresponding
Performance is different.
Analyze the mechanical property requirements of production board different-thickness, choose wherein minimum to requirement of strength thickness area
As raw material mechanical property reference, (typically for the Design of Auto Parts, intensity is wanted by the thinnest region
Asking minimum, requirement of strength is wanted height by thick district), the thickness raw material the most then choosing the thickest region of production board are thick
The reference of degree.Further according to mechanical property reference and root thickness reference, choose according to above-mentioned steps (2)
Principle selects suitable raw material.For above-mentioned requirements, according to the product standard of each big steel enterprise, and client
Requirement, select appropriate size raw material.
Rolling difference thick plate mechanics performance difference metallization processes control method has following several path:
(1) under the finished size determined and appointed condition, (reduction ratio sets to optimize design material stock thickness
Meter), the important parameter such as intensity and elongation percentage, select to lay the foundation for follow-up processing route；
(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+partly flat processing route；
(4) specifications of raw materials design+rolled hardening+Technology for Heating Processing+rolled hardening processing route.
The present invention has the beneficial effect that:
1, the present invention can be according to the differentiation feature of the mechanical property of rolling difference slab, and flexible design is different
Control method, produces the poor slab meeting the Design of Auto Parts personnel requirement, thus obtains same material, no
With the rolling difference slab of mechanical property, expand the range of application of rolling difference slab.
2, the inventive method be applicable to produce strength character differentiation within 120MPa, difference thickness rate 1:2 with
Interior all size vehicle differential slab parts.
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, thick district intensity
Low；B () thin district intensity Di Hou district intensity is high；C () thin district intensity and thick district intensity difference are 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 length；
Transition region: 100mm length；Thin district: 1mm is thick, 688mm length.Material HC340.Thin district yield strength is wanted
Ask between 340MPa～420MPa, elongation percentage more than 22%；Thick district yield strength require 400MPa with
On, the upper limit does not do requirement, elongation percentage more than 20%.
(1) according to the thickness of production board, thick is 2mm, and root thickness is 2mm, and material yield is strong
Degree requirement >=340MPa, elongation percentage >=22%, then according to a reference value requirement, selection material stock thickness is
2.0mm～2.5mm, if raw thickness is too big, Ze Bao district percentage pass reduction is equal to 60%, and deformation rate is too very much not
It is beneficial to shape, if raw thickness is 2mm, owing to raw material is generally negative common difference, so raw thickness may
Less than 2mm, being unfavorable for the THICKNESS CONTROL in thick district, consider, raw material original thickness is set to 22mm.Steel
Sheet material matter elects the CR340LA of Baosteel company standard as, its yield strength 340～420MPa, tensile strength >=
410MPa, elongation percentage >=22%.
(2) according to the size of drawing requirement, steel plate is made for difference slab, thin district thickness be 0.96-1.04mm it
Between, thick district thickness is between 1.96-2.04, and each zone length precision is all controlled according to dimensional requirement.
(3) calculating thin district reduction ratio, its numerical value, close to 55%, by test, obtains its perfect recrystallization temperature and exists
More than 600 DEG C, temperature retention time 4 hours～8 hours.And this annealing process, thick district is in incomplete recrystallized
District.Initial annealing process positions 620 DEG C, and temperature retention time 6 hours, the thin district now obtained is along its length
Yield strength is 325～336MPa, tensile strength 401～406MPa, elongation percentage 28%～31%, and thick district is along length
Direction yield strength is 413～418MPa, tensile strength 469～474MPa, and elongation percentage 26%～28% can be seen
Going out under this annealing process, thin district intensity is slightly less than standard value, and thick district mechanical property meets standard-required,
In this case, annealing temperature to 600 DEG C, temperature retention time 6 hours, the edge, thin district now obtained suitably are reduced
Length direction yield strength is 367～370MPa, tensile strength 430-438MPa, elongation percentage 28%-30%, thick
District's yield strength along its length is 436～444MPa, tensile strength 488-490MPa, elongation percentage 26%-
28%, it can be seen that under this annealing process, thin district mechanical property and thickness mechanical property are satisfied by standard and want
Ask,
(4) product requirement has been met due to first three operation, the smooth cancellation of this 4th operation, only carry out
Aligning；
(5) shearing according to length dimension required precision, the mechanical property differentiation that can obtain requirement is rolled
System difference slab.
Claims (5)
1. one kind rolling difference thick plate mechanics poor performance alienation control method, it is characterised in that: the method include as
Lower step:
(1) benchmark that raw material are chosen is determined:
After determining the specifications and characteristics differentiation requirement of target product, the thickness choosing the thickest region of target product is made
Root thickness value for material stock thickness；Choose the minimum intensity base as raw material mechanical property of target product
Quasi-reference value；The described minimum intensity choosing target product as the reference value of raw material mechanical property is
Refer to: using the minimum yield strength of target product as raw-material yield strength reference value, with target product
Minimum tensile strength as raw-material tensile strength reference value, make with the minimum elongation percentage of target product
For raw-material elongation percentage reference value；
(2) raw material are chosen:
The reference value of the raw material mechanical property determined according to step (1) and the benchmark of material stock thickness are thick
Angle value, the band steel of selection desired thickness and mechanical property as raw material, selection principle is: raw material surrender is strong
Degree >=raw-material yield strength reference value, raw material tensile strength >=raw-material tensile strength benchmark ginseng
Examine value, raw material elongation percentage >=raw-material elongation percentage reference value；Root thickness value≤material stock thickness≤
1.25 times of root thickness values；
(3) according to the dimensional requirement of target product, raw material are carried out continuous rolling, shut out by a passage
Meet the rolling difference slab of finished size requirement；
(4) according to the poor performance alienation requirement of target product, select suitable annealing process to through step (3)
Sheet material after rolling makes annealing treatment, and is specifically divided into following several situation:
1. its thin district intensity of target product is high, and thick district intensity is low: detect the rolling difference slab after rolling process completes
Mechanical property, if thin district mechanical property meets standard-required, then sheet material is made without being heat-treated, and directly enters
Row step (5)；
2. its thin district intensity of target product is low, and thick district intensity is high: according to the deformation rate in thin district, selects reasonably to move back
Ignition technique, this annealing process should meet: difference slab thin district part can carry out perfect recrystallization, and thick district is only
Partial annealing district or stress relief annealing district can be in；
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 meet perfect recrystallization and want
Ask；
(5) the rolling difference slab obtained through step (4), if its mechanical property meets standard-required, the most directly
Tap into row and shear packaging；If intensity level is on the low side, then for the mechanical property differentiation requirement of production board, pass through
Partly flat and straightening processing, is finely adjusted its mechanical property, is allowed to meet standard-required；
(6) the rolling difference slab that gained mechanics performance difference meets standard is sheared and blanking process.
Rolling difference thick plate mechanics poor performance alienation control method the most according to claim 1, its feature exists
In: during step (4) 2. kind situation, after annealing, the Bao Qu that detection is obtained and thick field forces performance value
Compare with a reference value, if intensity is higher, elongation percentage is on the low side, need to properly increase annealing temperature, until
Meet requirement；If low strength, elongation percentage have allowance, the most suitably reduce annealing temperature, when reducing insulation
Between, until intensity and elongation percentage meet standard-required.
Rolling difference thick plate mechanics poor performance alienation control method the most according to claim 1, its feature exists
In: in step (4), 3. the plant situation, when its thin district intensity of target product and thick district intensity are more or less the same,
After the sheet material enforcement high-temperature annealing process of rolling, the thin district that detection is obtained and thickness mechanical property numerical value and base
Quasi-value compares, if intensity is higher, elongation percentage is on the low side, then properly increases annealing temperature, wants until meeting
Ask；If low strength, elongation percentage have allowance, the most suitably reduce annealing temperature, reduce temperature retention time, until
Intensity and elongation percentage meet standard-required.
Rolling difference thick plate mechanics poor performance alienation control method the most according to claim 1, its feature exists
In: the rolling difference slab in step (5) obtained step (4) carries out the detailed process of mechanical property fine setting such as
Under:
①Bao district strength ratio standard value is slightly lower, then be adjusted by thin district is smooth；The pressure that flattening process is taked
Rate is 0.5%～1.5%；
②Bao district intensity and thick district intensity are the most on the low side, all use smooth operation to be adjusted these two parts, improve
This two parts yield strength and tensile strength, and do not affect elongation percentage, it is allowed to meet standard-required；
③Hou district strength ratio standard value is slightly lower, then district is smooth is adjusted by thick, the pressure that flattening process is taked
Rate is 0.5%～about 1.5%.
Rolling difference thick plate mechanics poor performance alienation control method the most according to claim 1, its feature exists
In: in step (6): do not carry out last smooth aligning such as fruit product, then its length dimension fully meets
Production board requirement, directly carries out shearing；And as fruit product has carried out smooth and aligning, although its each several part
Length all meets production board tolerance, but its cumulative length or the longest several millimeters than production board, thus logical
Crossing and shear the sheet material that obtains and finally need to carry out blanking process by blanking die, trial-production meets production board length and wants
Ask.
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| CN107716550B (en) * | 2017-09-09 | 2019-03-29 | 首钢集团有限公司 | A kind of production method of low-alloy longitudinal thickness-variable steel plate |
| PL3470145T3 (en) * | 2017-10-10 | 2022-06-20 | Outokumpu Oyj | Method for partial cold deformation of steel with homogeneous thickness |
| CN111539071B (en) * | 2020-04-27 | 2023-06-02 | 武汉工程大学 | Method and system for establishing differential plate crystal plasticity constitutive model and electronic equipment |
| CN111996462B (en) * | 2020-09-07 | 2022-02-18 | 鞍钢股份有限公司 | Longitudinal variable-thickness ultrahigh-strength ship board and production method thereof |
| CN112692147B (en) * | 2020-12-07 | 2022-12-02 | 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 |
| CN116230143B (en) | 2023-04-27 | 2023-07-11 | 燕山大学 | Design method for improving elongation of variable-thickness metal plate strip |
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| CN102784804A (en) * | 2011-05-18 | 2012-11-21 | 株式会社神户制钢所 | Manufacture method and rolling device for difference thickness plate |
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| JP2002331317A (en) * | 2001-04-27 | 2002-11-19 | Honda Motor Co Ltd | Blank member for auto body panel |
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| CN101796210A (en) * | 2007-08-15 | 2010-08-04 | 克里斯塔尔公司 | Method for producing a coated steel strip for producing taylored blanks suitable for thermomechanical shaping, strip thus produced, and use of such a coated strip |
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