CN106498297B - Precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet and its manufacturing method - Google Patents
Precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet and its manufacturing method Download PDFInfo
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Abstract
The present invention relates to precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet and its manufacturing method, solve existing precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet dimensional accuracy is low, Oxygen potential is relatively low, it is at high cost, be not suitable for high speed and precision punching press the technical issues of.Precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet provided by the invention, chemical component weight percentage are：C：0.15%~0.20%, Si≤0.05%, Mn：0.60%~0.80%, P≤0.018%, S≤0.008%, Alt：0.03%~0.07%, N≤0.0060%, surplus are iron and are unavoidably mingled with.For components such as high speed and precision punching press production automotive seat adjuster fluted discs.
Description
Technical field
The present invention relates to a kind of cold-rolled steel sheet for precision stamping processing, in particular to a kind of precision stamping automotive seats
Adjuster fluted disc cold-rolled steel sheet and its manufacturing method.
Background technique
The hot rolled steel plate produced by hot tandem, generally requires after pickling and cold-rolling, spheroidizing, improves material
Dimensional accuracy and inherent tissue morphology, so that intensity and plasticity is obtained matched well, be widely used in fine industry, manufacture such as vapour
The precision parts such as vehicle, motorcycle, machinery, hardware, household electrical appliances, camera, clock and watch, instrument and meter, communication electronics.Traditional precision zero
The processing method process of part is more, low precision, is generally processed by Pu Chong, machining, forging, casting and powder metallurgy to complete.It adopts
After fine blanking technology, a process can complete the manufacture of entire part, have great technical advantage and economic benefit.
China's fine dies technology is in Rapid development stage at present, according to fine processing request, to the inherent quality of material
It is required that it is stringent, in order to reach good fine performance, usually require that steel plate has preferable obdurability；According to automobile industry seat tune
The use demand of device fluted disc is saved, cold-strip steel used has following characteristic：Dimensional accuracy is higher, it is desirable that ± 0.05mm with
It is interior, obdurability is good, for yield tensile ratio less than 0.70, performance is uniform, and stability is high, and microscopic structure is ferrite+globular pearlite, nodularization
Rate is higher, reaches 90% or more, meets the requirement of high speed and precision punch press process production.
Chinese patent application 200910196007.4 discloses a kind of hot rolled steel plate for precision stamping and its manufacturing method,
This armor plate strength and hardness can matched well, be easy to fine, chemical analysis：C：0.05~0.30%；Si：≤
0.50%；Mn：0.50~1.50%；P≤0.02%；S≤0.01%；Cr：0.5~1.5%；Al：≤ 0.04 %Ni：0.02~
0.50%；And further including further includes Ti：≤0.05%；B：One or both of 0.0005~0.010%.
Chinese patent application 200780004015.3 discloses a kind of fine and processes excellent steel plate and its manufacturing method,
This steel plate has excellent fine moulding processability；Its chemical analysis is：C：0.1~0.5%；Si：0.50% or less；
Mn：0.2~1.50%； P：0.03% or less；S：0.02% hereinafter, further include Cr：3.5% or less；Mo：0.7% or less；Ni：
3.5% or less；Ti：0.01~0.10% and B：One or both of 0.0005~0.010%.
Technical solution disclosed in above-mentioned patent application is come by adding the alloying elements such as Ni, Ti, B to some extent
Change the interior tissue of material, form alloy solid solution and precipitation strength, prevent grain coarsening, improve product strength, improves material
Thermal effectiveness meets part performance requirement；But because being added to more alloying element in product, increase product manufacturing at
This；And using directly annealing after hot rolling, the dimensional accuracy of material overall length be cannot be guaranteed, and be not suitable for the higher high speed of precision
Fine-edge blanking.
Applicant applies for CN 201410388279.5 before this, discloses a kind of precision stamping automotive seat adjusting tooth plate use
Cold-rolled steel sheet and its manufacturing method；Higher, the chemical component weight using alloy and siliceous ingredient design, tensile strength rank
Measuring percentage is：C：0.38%~0.45%, Si：0.20%~0.30%, Mn：0.70%~0.90%, P≤0.018%, S
≤ 0.010%, Cr：0.80%~1.10%, Mo：0.05%~0.30%, Alt：0.015~0.050%, N≤0.0080%, it is cold
Rolling reduction ratio is 10%-20%；Mainly meet advanced vehicle automotive seat demand.
Summary of the invention
The object of the present invention is to provide precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet and its manufacturing method, solutions
Certainly existing precision stamping automotive seat adjuster fluted disc is low with cold-rolled steel sheet dimensional accuracy, Oxygen potential is relatively low, at high cost, unsuitable
The technical issues of high speed and precision punching press.
The present invention matches corresponding hot rolling, cold rolling and spheroidizing work by using the ingredient design scheme of low cost
Skill significantly reduces manufacturing cost, makes to obtain good matching between the intensity of cold-rolled steel sheet and toughness, the surface matter of cold-rolled steel sheet
Amount is high, meets the fine process requirements of automotive seat adjuster fluted disc.
The technical solution adopted by the present invention is that：
Precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet, chemical component weight percentage are：C：0.15%
~0.20%, Si≤0.05%, Mn：0.60%~0.80%, P≤0.018%, S≤0.008%, Alt：0.03%~0.07%,
N≤0.0060%, surplus are iron and are unavoidably mingled with.
The chemical component of precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet of the present invention limits within the above range
The reasons why it is as follows：
Carbon：Carbon is intensified element most economical, most basic in steel, is influenced after hot-roll annealing and intensity and hardness after quenching
Element in the present invention when carbon content such as less than 0.15%, needs to add more alloying elements and is strengthened, otherwise cannot be obtained
Intensity and hardness required by tooth plate part are adjusted to as automotive seat, it is uneconomical in this way；On the other hand, carbon content is more than
When 0.20%, the intensity and excessive high hardness of material bring adverse effect to subsequent fine；Comprehensively consider, the present invention limits carbon content
It is 0.15%~0.20%.
Silicon：Although silicon, which as solution strengthening element, is solid-solubilized in steel matrix, certain strengthening effect, Si content is high
When course of hot rolling in surface there is red rust iron scale, for cold-rolled products, be easy in subsequent production, be not easy pickling, and
And surface is easy to produce iron scale indentation, will affect finished appearance and influences following process；Therefore for great surface quality
It is required that product preferably low silicon ingredient design；The present invention limits Si content as 0.05% or less.
Manganese：Manganese is important solution strengthening element, and can improve harden ability, in order to obtain this effect, and Mn content is big
In 0.60%；But when Mn content is more than 0.80%, solution strengthening is too strong, is unfavorable for fine processing.The preferred Mn content of the present invention is
0.60%~0.80%.
Phosphorus：P in the present invention is harmful element, and the plasticity and toughness of strip can seriously be reduced by being segregated in crystal boundary, when smelting
Its content is reduced as far as possible, and the present invention limits P≤0.018%.
Sulphur：Sulphur is also harmful element in the present invention, forms MnS field trash with Mn in steel, during the rolling process along rolling
Direction stretcher strain processed, it is unfavorable to the plasticity and toughness of steel, influence fine.Wish to reduce its content as far as possible, present invention limit
Determine S≤0.008%.
Aluminium：The effect of aluminium in the present invention is to play the role of deoxidation and combine free state nitrogen, and aluminium is strong oxidizing property shape
Al is formed at oxygen in element and steel2O3It is removed in steel-making.Aluminium with oxygen other than combining, and the nitrogen also and in steel combines, formationization
The AlN of state is closed, to reduce the nitrogen of free state, continuous yield phenomenon is advantageous to eliminating.But aluminium it is excessively high will form it is excessive
Al2O3It is mingled with, and continuous casting is to be easy blocking sprue gate.The present invention limits Alt content as 0.030%~0.070%.
Nitrogen：Nitrogen exists in steel with free state, causes steel plate in uncoiling and subsequent molding, when by tensile stress, hair
Raw discontinuous yielding phenomenon, and can seriously reduce the plasticity and toughness of material, it is therefore desirable to limit nitrogen content.The present invention limits
N≤0.0060%。
The manufacturing method of precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet, this method include：
Molten steel carries out continuous casting after Fruit storage and obtains continuous casting steel billet, wherein the weight percent of the molten steel composition
For：C：0.15%~0.20%, Si≤0.05%, Mn：0.60%~0.80%, P≤0.018%, S≤0.008%, Alt：
0.03%~0.07%, N≤0.0060%, surplus are iron and are unavoidably mingled with.
Continuous casting steel billet is heated in 1170 DEG C~1230 DEG C, and hot rolling is two-part rolling mill practice, and roughing is 5 passage tandem rollings,
It more than austenite recrystallization temperature rolls, roughing end temp is 980 DEG C~1040 DEG C, and finish rolling is 7 passage tandem rollings, in austenite
Non- recrystallization temperature section rolling, it is 830 DEG C~870 DEG C, convexity≤50um of finishing rolling control hot rolled steel plate that finish rolling, which terminates temperature,
After finish rolling, steel plate thickness is 5mm~7mm, and section cooling is cooling using back segment, and coiling temperature is 600 DEG C~640 DEG C and batches hot
Rolled steel coils；
By above-mentioned coils of hot-rolled steel again uncoiling, after pickling, larger change is carried out on reversable mill or 5 Stands Cold Tandem Mills
The cold rolling of shape amount, cold rolling reduction ratio are 30%~45%, and the coil of strip after cold-rolling deformation passes through bell-type annealing furnace annealing, annealing temperature
Degree is 680 DEG C~720 DEG C, and the annealing soak time is 20h~for 24 hours, batches to obtain the finished steel plate with a thickness of 3mm~4.5mm.
The production process system reason that the present invention takes is as follows：
1, the setting of continuous casting steel billet heating temperature
Continuous casting steel billet heating temperature guarantees that complete austenitizing and the rolling requirements to hot rolling in material, slab of the present invention add
Hot temperature is set as 1170 DEG C~1230 DEG C.
2, roughing end temp is set
Roughing rolling guarantees to carry out more than austenite recrystallization temperature, it is ensured that austenite is by repeated deformation and ties again
Crystalline substance obtains uniformly tiny austenite grain, is easy to produce heavier iron scale for excessively high temperature, Surface Quality is not
Benefit, the present invention set roughing finishing temperature as 980 DEG C~1040 DEG C.
3, the Crown control of hot rolled steel plate
Two progress cold rollings are cut into since hot rolled plate will longitudinally be divided to, when hot plate convexity exceeds 50um, in cold rolling 30-45%
Moderate finite deformation amount when, cold rolled sheet shape can be caused more difficult to control, and influence the thickness and precision requirement of subsequent cold-rolled steel sheet overall length,
So cold-rolled steel sheet thickness deviation must be controlled by controlling the convexity of hot plate；The present invention sets hot rolled steel plate convexity≤50um.
4, finish rolling terminates temperature setting
Through the testing of materials and calculating, material phase transformation point A of the present invention3Equilibrium state transition temperature works as finish rolling at 827.5 DEG C or so
When end temperature is higher, austenite grain is excessively coarse, causes subsequent ferrite crystal grain coarse, and intensity is insufficient, and material group
Knitting can be unevenly distributed, and to terminate temperature too low for finish rolling, and it is excessive to will lead to rolling load, influence of rolled stability.Present invention setting
Finish rolling finishing temperature is 830 DEG C~870 DEG C.
5, hot-rolling coiling temperature is set
Hot-rolling coiling temperature mainly influences the annealing after materials microstructure, performance and cold rolling.Coiling temperature is too low, will cause
Cooling rate is very big, and crystal grain is meticulous, and the intensity of hot rolling is excessively high, will increase the resistance of deformation of cold rolling, and it is larger to be unfavorable for subsequent cold rolling
The rolling of deflection influences its rolling stability；Coiling temperature is excessively high, can be to pearlite piece interlamellar spacing coarsening, in pearlite
Carbide also can be coarse.Therefore the present invention sets hot-rolling coiling temperature as 600 DEG C~640 DEG C.
4, cold rolling reduction ratio is set
Determine that the main technologic parameters of steel plate inherent quality are cold rolling reductions in cold rolling process.Work as cold rolling reduction
Bigger, the deformation stored in tissue after cold rolling can be more, and the nucleation rate of crystal grain is higher in annealing process, and recrystallization is more filled
Point, it is easier to promote the nodularization of carbide, while grain structure is more evenly, to further improve the deformation performance of product；And
And it can also obtain higher dimensional accuracy；The technical solution of the patent application publication of CN 201410388279.5, because of its hot-rolled steel
Plate intensity rank is higher than the present invention, and cold rolling reduction is limited to cold rolling load, reduction ratio 10%-15%；In view of cold
The practical pressure ability of milling train, the present invention set cold rolling reduction ratio as 30%~45%.
7, annealing temperature and annealing time setting
Through the testing of materials and calculating, materials A of the present invention1Transformation temperature equilibrium state transformetion range is 707.3 DEG C or so, but
In view of the accumulative effect of preceding process cold rolling moderate finite deformation, cold-rolling deformation process may promote carbide to shift to an earlier date nodularization, therefore
The present invention sets annealing temperature as 680 DEG C~720 DEG C,
Soaking zone soaking time is also very crucial when annealing, and the time is too short, then lamellar pearlite chain fails fusing, shape completely
It is diffused in ferrite crystal grain at tiny spherical particle, and uniformly, forms Dispersed precipitate；Such as overlong time, then nodular cementite
It can grow up and reunite together again again, while ferrite crystal grain also can obviously grow up, cause material plasticity decline obvious, it is unfavorable
It is processed in subsequent fine.Comprehensively consider, the present invention sets annealing time as 20h~for 24 hours.
The microscopic structure for the precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet that the present invention obtains be ferrite+
The globular pearlite of even Dispersed precipitate, Oxygen potential >=90%, tissue grain size number are I6~8, the yield strength Rp of steel plate0.2For
200-250MPa, tensile strength Rm are 350~390MPa, yield tensile ratio Rp0.2/ Rm is 0.50~0.68, elongation after fracture A50For
38%~47%, surface hardness is 60~68HRB.
The present invention has following good effect compared with prior art：
1, the present invention is designed by using the common alloying elements ingredient of middle low carbon content and low silicon, and combines hot rolling, cold
Roll process design, has obtained a kind of fine steel without containing expensive alloying elements such as Cr, Ti, Ni, and not only manufacturing cost is significantly
It reduces, and obtains the surface quality better than siliceous design and have good obdurability, fully meet high speed and precision punching
Demand, the present invention few, the effect that surface quality is good, production cost is low that can play alloy consumption thus.
2, the present invention carries out moderate finite deformation cold rolling, ensure that cold-strip steel thickness and precision by control cold rolling reduction ratio
While, the nodularization of lamellar pearlite in steel plate tissue during subsequent spheroidizing is effectively facilitated, and then reduce annealing temperature
Degree and shortening annealing soaking time, reduce energy consumption.
3, for the present invention by using reasonable annealing process, obtained steel plate has preferable obdurability, obtained steel plate group
Middle cementite Oxygen potential is knitted substantially 95% or so, and Dispersed precipitate, material property fluctuation range is small and uniformity is good, meets high
The requirement of fast fine-edge blanking.
Detailed description of the invention
Attached drawing 1 is the hot rolled steel plate metallographic structure photo of the embodiment of the present invention 1；
Attached drawing 2 is the cold rolled annealed steel plate metallographic structure photo of the embodiment of the present invention 1.
Specific embodiment
Below with reference to disclosed in Examples 1 to 4 and 1-Chinese patent application of comparative example 200910196007.4, compare
Example 2-China is specially disclosed in application 200780004015.3, and the present invention will be further described, as shown in 1 ~ table of table 4.
The chemical component of the present invention of table 1（Weight percent %）, surplus is Fe and inevitable impurity.
According to the requirement that material composition of the present invention designs, using molten iron pre-desulfurization, converter top bottom blowing blows the station Ar
(or the heating of LF furnace) bottom blowing Ar guarantees that mixing time is greater than 8 minutes, at RH furnace progress trimming, vacuum circulation degassing
Reason guarantees that the pure degassing time of RH is greater than 8 minutes, and whole process blows Ar protective casting, and scale continuous casting steel billet is cut into after casting.
As shown in table 1, a large amount of valuable alloying elements, the design of chemical component and nothing of the present invention are contained in Comparative Examples 1 and 2
Comparativity.
It after the heated furnace of continuous casting steel billet reheats, is rolled on continuous hot tandem rolling mill, process control parameter is shown in Table 2, leads to
After crossing roughing milling train and finish rolling Continuous mill train controlled rolling, through section cooling, section cooling is cooling using back segment, is then rolled up
It takes, produces qualified coils of hot-rolled steel, plate crown≤50um, with a thickness of 5mm~7mm, referring to attached drawing 1, the metallographic of hot rolled steel plate
Tissue is ferrite+pearlite+a small amount of bainite.
The hot rolling technology control parameter of the present invention of table 2
By above-mentioned coils of hot-rolled steel again uncoiling after overpickling, carried out on reversable mill or 5 Stands Cold Tandem Mills larger
The cold rolling of deflection, the reduction ratio of cold rolling are 30%~45%, and the steel band after cold-rolling deformation is by bell-type annealing furnace annealing, volume
Obtain the finished steel plate of thickness 3mm~4.5mm.Annealing process is：Steel band bell type annealing furnace annealing temperature be 680 DEG C~
720 DEG C, the annealing soak time is 20h~for 24 hours.Cold rolling and annealing process control parameter are shown in Table 3.
The cold rolling of the present invention of table 3, annealing process control parameter
Using precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet obtained by the above method, referring to attached drawing 2, cold rolling
The globular pearlite that the microscopic structure of steel plate is distributed for ferrite+even dispersion, and Dispersed precipitate, Oxygen potential >=95%, grain size
Rank is I7.
The cold-rolled steel sheet that the present invention is obtained is according to metal material stretching test part 1:Room temperature test method（GB/T
228.1-2010）, metal material Rockwell hardness test part 1：Test method（GB/T 4340-2009）Carry out mechanical property
Detection.Mechanical performance data is shown in Table 4.
The yield strength Rp for the cold-rolled steel sheet that the present invention obtains0.2It is 350MPa for 200MPa-250MPa, tensile strength Rm
~390MPa, yield tensile ratio Rp0.2/ Rm is 0.52~0.68, elongation after fracture A50Be 38%~47%, surface hardness be 60~
68HRB。
The mechanical property of the cold-rolled steel sheet of the present invention of table 4
The cold-rolled steel sheet that the present invention obtains has product obdurability good, and performance inconsistency is narrow, and stability is good, and Oxygen potential is high, thick
Spend the advantages of precision is high, surface quality is good, easy high speed precision stamping.
In addition to the implementation, the present invention can also have other embodiments.It is all to use equivalent substitution or equivalent transformation shape
At technical solution, fall within the scope of protection required by the present invention.
Claims (4)
1. precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet, chemical component weight percentage are：C：0.15%~
0.20%, Si≤0.05%, Mn：0.60%~0.80%, P≤0.018%, S≤0.008%, Alt：0.03%~0.07%,
N≤0.0060%, surplus are iron and are unavoidably mingled with；Its microscopic structure is the spherical pearly-lustre of ferrite+even dispersion distribution
Body, Oxygen potential >=90%, tissue grain size number are I6~8, the yield strength Rp of 3.0mm~4.5mm thick cold rolled steel sheet0.2
It is 350MPa~390MPa, yield tensile ratio Rp for 200MPa-250MPa, tensile strength Rm0.2/ Rm is 0.52~0.68, elongation of having no progeny
Rate A50It is 38%~47%, surface hardness is 60~68HRB.
2. the manufacturing method of precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet as described in claim 1, including：
Molten steel carries out continuous casting after Fruit storage and obtains continuous casting steel billet；
Continuous casting steel billet carries out hot rolling after 1170 DEG C~1230 DEG C heating, and the hot rolling is two-part rolling mill practice, and roughing is
Five passage tandem rollings, roll more than austenite recrystallization temperature, and roughing end temp is 980 DEG C~1040 DEG C, and finish rolling is 7 passages
Tandem rolling rolls in the non-recrystallization temperature section of austenite, and it is 830 DEG C~870 DEG C that finish rolling, which terminates temperature, and section cooling is adopted after finish rolling
Cooling with back segment, 600 DEG C~640 DEG C whens, batch to obtain coils of hot-rolled steel；
Coils of hot-rolled steel uncoiling again, through pickling, cold rolling, cold rolling reduction ratio is 30%~45%, bell-type annealing furnace annealing, annealing temperature
Degree is 680 DEG C~720 DEG C, and the annealing soak time is 20-24h, batches to obtain with a thickness of 3.0mm~4.5mm finished steel plate.
3. the manufacturing method of precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet as claimed in claim 2, feature
It is, convexity≤50 μm of finishing rolling control hot rolled steel plate.
4. the manufacturing method of precision stamping automotive seat adjuster fluted disc cold-rolled steel sheet as claimed in claim 2, feature
It is, after finish rolling, hot rolled steel plate is with a thickness of 5mm~7mm.
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| CN112430787B (en) * | 2019-08-26 | 2022-04-15 | 上海梅山钢铁股份有限公司 | Low-yield-ratio high-strength cold-rolled hot-dip galvanized steel plate and manufacturing method thereof |
| CN112430788A (en) * | 2019-08-26 | 2021-03-02 | 上海梅山钢铁股份有限公司 | Hot-dip galvanized steel sheet for 304 stainless steel composite board and manufacturing method thereof |
| CN111673400B (en) * | 2020-06-18 | 2022-04-01 | 苏州伊泰克汽配科技有限公司 | Machining process of automobile seat adjuster gear |
| CN114058941A (en) * | 2020-07-31 | 2022-02-18 | 宝山钢铁股份有限公司 | Cold-rolled steel plate, manufacturing method thereof and blanking piece for automobile |
| CN115478223B (en) * | 2022-09-27 | 2023-06-13 | 首钢集团有限公司 | Cold-rolled fine-stamped steel strip and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265550A (en) * | 2008-04-30 | 2008-09-17 | 武汉钢铁(集团)公司 | Cold rolling automobile plate for micro-alloy high-strength steel stamping and producing method thereof |
| CN101603147A (en) * | 2009-07-09 | 2009-12-16 | 武汉钢铁(集团)公司 | Be applicable to the hard tinned plate and the production technique thereof of punch process |
| CN101787484A (en) * | 2010-01-26 | 2010-07-28 | 武汉钢铁(集团)公司 | Low-silicon cold rolled precision strip steel for copper-lead bearing steel back and production method thereof |
-
2015
- 2015-09-08 CN CN201510563487.9A patent/CN106498297B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101265550A (en) * | 2008-04-30 | 2008-09-17 | 武汉钢铁(集团)公司 | Cold rolling automobile plate for micro-alloy high-strength steel stamping and producing method thereof |
| CN101603147A (en) * | 2009-07-09 | 2009-12-16 | 武汉钢铁(集团)公司 | Be applicable to the hard tinned plate and the production technique thereof of punch process |
| CN101787484A (en) * | 2010-01-26 | 2010-07-28 | 武汉钢铁(集团)公司 | Low-silicon cold rolled precision strip steel for copper-lead bearing steel back and production method thereof |
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