CN106756549B - A kind of automotive high-performance damping spring strip production methods - Google Patents
A kind of automotive high-performance damping spring strip production methods Download PDFInfo
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- CN106756549B CN106756549B CN201611150549.4A CN201611150549A CN106756549B CN 106756549 B CN106756549 B CN 106756549B CN 201611150549 A CN201611150549 A CN 201611150549A CN 106756549 B CN106756549 B CN 106756549B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0268—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment between cold rolling steps
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/06—Width
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/22—Hardness
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- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a kind of automotive high-performance damping spring strip production methods, belong to spring steel band preparation technical field.The present invention is included raw material preparation, pickling, tandem rolling, is carried out using bell furnace first time annealing, rolling, slitting, carried out using bell furnace second annealing, product inspection, immersion oil packaging and be put in storage, the spring steel band prepared using technical solution of the present invention, its thickness deviation and width tolerance fluctuation are small, spring steel band is set to obtain stability, and it is effectively improved the intensity, hardness and elongation percentage of spring steel band, and then it can satisfy demand of the automobile to damping effect, meanwhile solving the deficiency of spring steel band preparation process in the prior art.
Description
Technical field
The present invention relates to spring steel band preparation technical fields, more specifically to a kind of automotive high-performance damping bullet
Spring strip production methods.
Background technique
Currently, the performance of automobile is also constantly refreshing, and wherein shock-absorption device is automobile as auto industry develops rapidly
One of important component.When automobile broken terrain when driving, automobile will appear apparent vibration, easily generation traffic
Accident, currently, most of automobile be reach maximum vibrating effect by installation damping device, and damping device be by
What multi-layer spring steel band was constituted, therefore, the damping effect of the damping device is mainly determined by the performance of spring steel band, currently, bullet
Spring steel band is in existing preparation process, and complex process, the production cycle is long, consumes a large amount of energy, and in heat treatment process
It is easy to cause waste product, increases steel band loss, production efficiency is low and high production cost, it is most important that the spring steel band produced reaches
Less than expected damping effect, and the service life of automobile is caused also to decrease, so preparing the bullet with high-performance damping
Spring steel band is following development trend.
Summary of the invention
1. technical problems to be solved by the inivention
It is an object of the invention to overcome the spring steel band prepared in the prior art that expected damping effect is not achieved, cause
Automotive service life reduce and spring steel band preparation process present in various defects the deficiencies of, provide a kind of automobile
High-performance damping spring strip production methods, the spring steel band prepared using technical solution of the present invention, thickness deviation and width
Tolerance variations are small, so that spring steel band is obtained stability, and be effectively improved the intensity, hardness and elongation percentage of spring steel band, in turn
It can satisfy demand of the automobile to damping effect, meanwhile, solve the deficiency of spring steel band preparation process in the prior art.
2. technical solution
In order to achieve the above objectives, technical solution provided by the invention are as follows:
A kind of automotive high-performance damping spring strip production methods of the invention, comprising the following steps:
Step 1: raw material preparation；
Step 2: pickling；
Step 3: tandem rolling；
Step 4: carrying out first time annealing using bell furnace；
Step 5: rolling；
Step 6: slitting；
It anneals Step 7: carrying out second using bell furnace；
Step 8: product inspection；
Step 9: immersion oil is packed；
Step 10: storage.
Further, the raw material in step 1 is 65Mn spring steel, chemical composition content are as follows: C:0.0236%；S:
0.009%；Mn:0.016%；P:0.009%；Si:0.008%, raw material specification are 3.5*170 mm.
Further, in step 2, mass concentration is used to carry out pickling, pickling temperature 75- for the hydrochloric acid solution of 18-20%
85 DEG C, pickling speed 60m/min.
Further, in step 3, by three Continuous mill train of four-roller, 2% emulsion is greater than using concentration, carries out 3 passages
Rolling, is rolled into the semi-finished product with a thickness of 2.8mm for the raw material after step 2 pickling, and drafts per pass is respectively
0.4mm, 0.2mm and 0.1mm, the hardness of roll body of three Continuous mill train of four-roller are HRC62-63, roller diameter is poor < 2mm, and upper and lower roll crown
Less than 0.1mm, the roll surface roughness of preceding 2 passage is 0.1um, and the roll of rear 1 passage is using CNC roll grinder to roll
Surface is refined, and roll surface roughness 0.08um is made.
Further, in step 4, specific annealing process are as follows: cover will be put into step 3 with a thickness of the semi-finished product of 2.8mm
It in formula furnace, is first warming up to 450 DEG C and keeps the temperature 2 hours, then be warming up to 550 DEG C with 35 DEG C per hour and keep the temperature 3 hours, then with per hour 30
It DEG C is warming up to 720 DEG C and keeps the temperature 15 hours, and then heating mantles stop heating, naturally cool to 600 degree, when cooling to in-furnace temperature
Between be 10-16 hour, then heating mantles are supportted into high 50cm and naturally cool to 550 DEG C, cooling time is 5-8 hours, it is finally air-cooled extremely
Water cooling after 280 DEG C, 80 DEG C are come out of the stove.
Further, in step 5, by four-roller reversable cold-rolling machine, 2% emulsion is greater than using concentration, carries out 5 passages
Semi-finished product after step 4 is annealed are rolled into the steel band with a thickness of 1.4mm, drafts per pass is respectively by rolling
0.4mm, 0.3mm, 0.3mm, 0.3mm and 0.1mm, the hardness of roll body of the four-roller reversable cold-rolling machine are as follows: HRC62-63, roller diameter is poor <
2mm, upper and lower roll crown are less than 0.1mm, and the roll surface roughness of preceding 4 passage is 0.1um, and the roll of rear 1 passage uses numerical control
Roll grinder refines roller surface, the roll surface roughness 0.08um made.
Further, in step 7, specific annealing process are as follows: the semi-finished product after step 6 slitting are put into bell furnace,
It is first warming up to 450 DEG C and keeps the temperature 2 hours, then be warming up to 550 DEG C with 35 DEG C per hour and keep the temperature 3 hours, then heated up with 30 DEG C per hour
15 hours are kept the temperature to 720 DEG C, and then heating mantles stop heating, drop to 600 degree to in-furnace temperature, cooling time is that 10-16 is small
When, then heating mantles to be supportted into high 50cm and naturally cool to 550 DEG C, cooling time is 5-8 hour, it is finally air-cooled to water cooling after 250 DEG C,
80 DEG C are come out of the stove.
Further, in the entire annealing process of step 4 and step 7, protective gas is passed through in bell furnace always.
Further, in step 4 and step 7, the protective gas being passed through in bell furnace is the nitrogen resolved by ammonia
Gas and hydrogen gas mixture, volume content percentage are as follows: nitrogen accounts for 25%, and hydrogen accounts for 75%.
Further, the trimmed size in step 8 is 1.4*165 mm, and finished product thickness deviation is negative 0.05mm, and width is inclined
Difference is negative 0. 2mm, and intensity is 490-530 Mpa, and hardness is HV 145-155, and elongation percentage is greater than 29%.
3. beneficial effect
Using technical solution provided by the invention, compared with prior art, there is following remarkable result:
(1) a kind of automotive high-performance damping spring strip production methods of the invention, it is each in step 3 and step 5
From road number and drafts per pass choose and can reduce the generations of operation of rolling Dislocations, therefore in the operation of rolling of the present invention
The specific multi- pass rolling deformation scheme taken can avoid steel band and the phenomenon that hardness increase, plasticity and toughness reduce occurs, to obtain
It obtains longer crystal grain and provides possibility, meanwhile, it can prevent steel band from occurring the situations such as flange, wave during the rolling process.
(2) whether a kind of automotive high-performance damping spring strip production methods of the invention, the entrance for protecting gas are equal
Even, the inlet whether sufficient annealing process for all directly affecting steel band, therefore protective gas is filled with mode to the annealing of steel band
It can have a significant impact, technical staff can be guaranteed by theory analysis and lot of experiment validation, discovery by control flow mode
The inlet of protective gas is sufficient, and protective gas even into.
(3) a kind of automotive high-performance damping spring strip production methods of the invention, in step 3 and step 5, most
The roll of 1 passage is all made of CNC roll grinder and refines to roller surface after latter, makes the roll surface roughness be
Then 0.08um puts into milling train again and rolls to steel band, directly contacts steel band by roller surface, carry out to the surface of steel band
Grinding avoids the phenomenon that cleaning process is caused grinding unevenly and generated brush mark using brush roll grinding, and rolling after refining
Roller surface grinds steel band, can preferably control steel strip surface quality, reduces the generation of surface brush mark.
(4) a kind of automotive high-performance damping spring strip production methods of the invention, the two of step 4 and step 7
In secondary annealing process, annealing temperature is divided into multiple stages, and each stage is in different ways and different speed carries out
Annealing, meanwhile, reasonable soaking time is set, makes spring steel band in annealing process, is not susceptible to crystal boundary and is crushed, can restore
Normal tissue finally obtains the product of our needs.
Specific embodiment
To further appreciate that the contents of the present invention, the present invention is described in detail in conjunction with the embodiments.
The present invention will be further described with reference to the examples below.
Embodiment 1
A kind of automotive high-performance damping spring strip production methods of the present embodiment, comprising the following steps:
Step 1: raw material preparation.
Raw material is 65Mn spring steel, chemical composition content are as follows: C:0.68% in the step；S:0.002%；Mn:1.08%；P:
0.019%；Si:0.22%, remaining is iron and impurity.Raw material specification is 3.5*170 mm.Three steps are carried out to ready raw material
It examines, first confirms that steel mill, then test to the appearance of raw material, it is desirable that raw material edge is smooth, and edge is without flanging burr, together
When with vernier caliper measurement width, it is desirable that width difference finally chemically examines material composition in -2mm -3mm.
Step 2: pickling.
Mass concentration is used to carry out pickling for the hydrochloric acid solution of 18-20% in the step, 75-85 DEG C of pickling temperature, pickling is fast
Degree is 60m/min.It should be understood that in acid cleaning process, pickling environment, that is, hydrochloric acid concentration, pickling temperature and pickling speed
Determine pickling quality, the present invention, which passes through to be arranged in, can guarantee the iron scale completely removed on steel band under such pickling environment.
It is to be noted that selecting hydrochloric acid in the present invention why, rather than sulfuric acid is selected, main cause has the following: hydrochloric acid acid
It washes compared with sulfuric acid phase ratio, the pickling speed of hydrochloric acid is fast, and the steel strip surface after chlorohydric acid pickling is high-quality, and chlorohydric acid pickling steel band less holds
Hydrogen Brittleness Phenomena easily occurs, when chlorohydric acid pickling, metal loss is less, and hydrochloric acid pickling waste liquor recovery process is mature.Meanwhile in pickling
In the process, if acid strength is excessively high, steel band can be made to generate overpickling, if acid strength is too low, and can generate deficient pickling, sternly
Remaining red blocky iron scale, is pressed into steel strip surface again after iron sheet falls off in cold rolling, not only destroys steel band table when weight
Face quality more seriously causes steel band to extend uneven, shape wave, wooden dipper song occurs, destroys template, reduce yield rate；In acid
During washing, if pickling speed is too fast, the iron scale removal of steel strip surface is not clean, it will generates and owes pickling phenomenon, such as
Fruit pickling speed is excessively slow, after hydrochloric acid is in addition to occurring reaction completely with iron scale, can also chemically react, generate with matrix
Pickling phenomenon, equally, the too high or too low generation that can all cause two kinds of different phenomenons of pickling temperature.Applicant passes through in the present invention
It crosses the discovery of long-term production practices creativeness: mass concentration being used to carry out pickling, pickling temperature for the hydrochloric acid solution of 18-20%
75-85 DEG C, pickling speed 60m/min, the steel band performance of final available high quality.It should be understood that in the present embodiment
Specific pickling speed adjustment when pickling is: pickling speed when pickling just starts is relatively low, after waiting pickling normal, is slowly mentioning
High pickling speed, when pickling speed value be 60m/min, answer held stationary to run.To sum up, pickling concentration, pickling speed and acid
It is interrelated to wash temperature three, and mutually restricts, only holds the relationship between three well, just can guarantee good pickling
Quality improves the service performance of steel band.
Step 3: tandem rolling.
Roll prepares: getting out three Continuous mill train of four-roller by technique requirement, cleans out roller slot both ends before filling roller, install and roll
Check whether roll surface is clean after roller, and the emulsion with concentration greater than 2% cleans one time.It is required that the roller of three Continuous mill train of four-roller
Body hardness are as follows: HRC62-63, roller diameter is poor < 2mm, and upper and lower roll crown is less than 0.1mm, and roll surface roughness is 0.1 μm.
Upper volume: upper volume should be accomplished steady, quasi-, fast rapidly, and socket prevents galled spots at center.
Uncoiling feeding: it checks supplied materials quality, lead position and whether be close to or excessively loose sideslip.
Rolling: raw material in step 1 is rolled into the semi-finished product with a thickness of 2.8mm with a thickness of the steel band of 3.5mm, rolls 3 altogether
Passage, and drafts per pass is respectively 0.4mm, 0.2mm and 0.1mm, one skilled in the art that the production after cold rolling
Quality mainly by the operation of rolling rolling pass and rolling pass sendout influenced, the present invention is by specifically rolling
Secondary: 3 passages and drafts per pass are respectively 0.4mm, 0.2mm and 0.1mm to reduce the generation of operation of rolling Dislocations,
Therefore take multi- pass rolling deformation scheme to can avoid steel band in the operation of rolling and hardness increase occur, plasticity shows with what toughness reduced
As, provide possibility to obtain longer crystal grain, meanwhile, the passage sendout can prevent in the operation of rolling steel band occur flange,
The situations such as wave.It is to be noted that steel band has processing hardening phenomenon in cold rolling, therefore drafts per pass is gradually reduced.
The roll surface roughness of preceding 2 passage in three Continuous mill train of four-roller is 0.1um, and the roll of rear 1 passage uses numerical control roll
Grinding machine refines roller surface, makes roll surface roughness 0.08um, then puts into milling train and roll to steel band, passes through
Roller surface directly contacts steel band, grinds to the surface of steel band, avoids and causes to grind using brush roll grinding in cleaning process
The phenomenon that mill is uneven and generates brush mark, and the roller surface after refining grinds steel band, can preferably control steel band table
Face quality reduces the generation of surface brush mark.It is to be noted that up-down rollers cooperation should closely in the operation of rolling, and even tension, pressure
Lower adjusting is not easy frequently, it is ensured that uniformly with item difference, template the is straight not super 1.5mm/m of camber.
Measurement: calibrator is put among steel band, and irregularly measurement both sides are thick poor, and the moment pays attention to calibrator digital display dynamic, with
Just it is reasonably adjusted.
Batch: tension is moderate, and clot is neat.
It unloads volume bundling: when the de- tail of steel band unloads volume, gently being sling material with driving, steady pull out is batched, and is tied up as required, interior
Outer to be packaged using strap, not loosely, outer volume bailing band is away from taking the lead not surpass 15cm.
Mark: indicating grade of steel, specification, rolling date, shift on steel band, defective in quality is labeled, and mark is clear
Clear, legibility is carefully and neatly done.
Step 4: carrying out first time annealing using bell furnace.
, with a thickness of in the semi-finished product investment bell furnace of 2.8mm, bell furnace will once be vacuumized first in step 3
Processing, is then filled with protective gas into bell furnace, which is the nitrogen and hydrogen gas mixture resolved by ammonia,
Volume content percentage are as follows: nitrogen accounts for 25%, and hydrogen accounts for 75%, is filled with the detailed process of protective gas are as follows: intake valve is slowly opened,
The flow of protective gas is adjusted to 1.5m3/ h, and make quick-fried test of ringing, qualified rear heat release outer cover capable of hoisting after 1h.The process
Purpose be residual air discharge after vacuumizing, prevent it is evacuated in bell furnace after go back remnants and have air, in subsequent cover
During formula stove heating, so that explosion is generated after the oxygen mix in hydrogen and air at high operating temperatures.Meanwhile by continuing
Fill protective gas, can make to reach certain pressure intensity in bell furnace, prevent the entrance of outside air, but during this protective gas stream
Amount is not easy excessive, avoids bell furnace too high pressure, so that bell furnace stress is serious, is unfavorable for the long-time service of bell furnace.
Then bell-type in-furnace temperature risen into the greasy dirt of 450 DEG C of heat preservations, 2 hours removal steel strip surfaces, purify gas in bell furnace
Atmosphere, while reaching homogenization preheating.550 DEG C are warming up to 35 DEG C per hour again and keeps the temperature 3 hours, wait organization internal crystal grain uniform
Change distribution, then be warming up to 720 DEG C with 30 DEG C per hour and keep the temperature 15 hours, obtains the crystal grain of homogenization.It should still need to be filled in the process
The specific flow control process of protective gas, protective gas is: by the flow of protective gas by 1.5m at the beginning3/ h is increased to
10m3/h.Protective gas in the present embodiment is the nitrogen and hydrogen gas mixture resolved by ammonia, volume content percentage
Are as follows: nitrogen accounts for 25%, and hydrogen accounts for 75%, and when heating, protective gas is driven by blower, and the protection of steady flow is formed in bell furnace
Air-flow is looped around the surrounding of steel band, meanwhile, protective gas can also serve as heat transfer medium, and the heat transfer that hot outer cover generates is to guarantor
Gas is protected, protective gas transfers heat to the steel band of package inside it again, to enable the semi-finished product with a thickness of 2.8mm
Uniformly reach technological temperature, completes annealing process.It should be understood that due in protective gas hydrogen content it is higher, and hydrogen
Density is small, dynamic viscosity is small, reproducibility is strong, flows fastly under the drive of blower, thermally conductive good, this indirect heating manner makes steel band
It is uniformly heated, and thermal histories are continual and steady, is conducive to the Annealing Property for improving steel band.Simultaneously, it should be noted that:
The mode that is filled with of protective gas has a significant impact the Annealing Property of steel band, protect gas entrance whether uniformly, inlet whether
Abundance all directly affects the thermal histories of steel band, and protective gas unevenly will lead to steel band uneven heating, to make steel band group
Unevenness is knitted, difference occurs in each section hardness, and performance is unstable；Protective gas inadequate and to will lead to steel band heated slowly, adds
The hot time extends, and reduces production efficiency.In order to guarantee that protective gas enters uniformly simultaneously, and content is sufficient, skill in the present invention
Art personnel realize that technical staff is had found by theory analysis and lot of experiment validation by protective gas using control flow mode
Flow by 1.5m at the beginning3/ h increases to 10m3Annealing effect is best when/h, so that protective gas forms one in bell furnace
Steel band is uniformly quickly heated in the heating layer that layer circulates, realization, improves steel band internal crystallization quality and crystallization degree, promotees
It grows up into grain uniformity, improves steel band dense internal organization degree, reduce defect concentration, improve crystalline texture, while also accelerating
Annealing speed, improves production efficiency.
And then heating mantles stop heating, naturally cool to 600 degree to in-furnace temperature, and cooling time is 10-16 hours, then
Heating mantles to be supportted into high 50cm and naturally cool to 550 DEG C, cooling time is 5-8 hour, it is finally air-cooled to water cooling after 280 DEG C, 80 DEG C
It comes out of the stove, avoids tapping temperature excessively high, lead to steel band high-temperature oxydation.From the type of cooling it can be seen that after entirely cooling procedure is first slow
It is appropriate to accelerate, and why just start to be rapidly cooled using water-cooling pattern after temperature is reduced to 280 DEG C during this, be because
It is steel band at 300 DEG C hereinafter, performance does not change substantially, therefore can shorten the time of coming out of the stove by such type of cooling, improves life
Produce efficiency.It should be understood that should still need to be filled with protective gas in the process, protective gas serves as cooling medium at this time, makes steel band
It gradually cools down, because the cooling of steel band cannot undergo abrupt temperature drop process, cooling velocity is too fast to may cause steel band appearance instead
The phenomenon that hardness increases, and plasticity and toughness reduce, and then the more uniform spring steel band of tissue cannot be obtained.Therefore in the present invention
In, technical staff is the cooling effect for guaranteeing steel band, by the flow of protective gas by the 10m in heating and thermal insulation stage3/ h is adjusted again
Whole is 1.5m3/h。
Step 5: rolling.
Same step 2, unlike: this step carries out 5 passes using four-roller reversable cold-rolling machine, will move back through step 4
The steel band that semi-finished product after fire are rolled into a thickness of 1.4mm, drafts per pass be respectively 0.4mm, 0.3mm, 0.3mm,
0.3mm and 0.1mm, the present invention pass through specific rolling pass: 5 passages and drafts per pass be respectively 0.4mm,
0.3mm, 0.3mm, 0.3mm and 0.1mm reduce the generation of operation of rolling Dislocations, therefore take multi-pass to roll in the operation of rolling
Deformation scheme processed can avoid steel band and the phenomenon that hardness increase, plasticity and toughness reduce occurs, and provide to obtain longer crystal grain
May, meanwhile, which can prevent steel band in the operation of rolling from the situations such as flange, wave occur.It is to be noted that steel
Band has processing hardening phenomenon in cold rolling, therefore drafts per pass is gradually reduced.
The roll surface roughness of preceding 4 passage is 0.1um in the four-roller reversable cold-rolling machine, and the roll of rear 1 passage uses number
Control roll grinder refines roller surface, so that roll surface roughness is 0.08um, then puts into milling train and carries out to steel band
Rolling, is directly contacted steel band by roller surface, grinds to the surface of steel band, avoid and ground in cleaning process using brush roll
The phenomenon that mill causes grinding unevenly and generates brush mark, and the roller surface after refining grinds steel band, can preferably control
Steel strip surface quality reduces the generation of surface brush mark, can finally obtain the good spring steel band of surface quality.
Step 6: slitting.The both sides of width of steel band are cut it should be understood that slitting refers to, to obtain width
For the steel band of 165mm.
It anneals Step 7: carrying out second using bell furnace.
Same step 4, the difference is that second of annealing process are as follows: be first warming up to 450 DEG C and keep the temperature 2 hours, then with per hour 35
It DEG C is warming up to 550 DEG C and keeps the temperature 3 hours, then be warming up to 720 DEG C with 30 DEG C per hour and keep the temperature 15 hours, and then heating mantles stop
Heating drops to 600 degree to in-furnace temperature, and cooling time is 10-16 hours, then heating mantles are supportted high 50cm and naturally cool to 550
DEG C, cooling time is 5-8 hours, and last air-cooled to water cooling after 250 DEG C, 80 DEG C are come out of the stove.It should be understood that step 4 is primary
Annealing, belongs to semi-finished product, in order to shorten the time of coming out of the stove, can carry out water cooling in 300 DEG C or less higher temperatures, and this step is two
Secondary annealing, belongs to finished product, to quality requirement height is stepped back, so water cooling temperature is low compared with the former.
Step 8: product inspection.
The spring steel band prepared using above-mentioned processing step, the spring steel band specification are 1.4*165 mm, and finished product thickness is inclined
Difference is negative 0.05mm, and width difference is negative 0. 2mm, and intensity is 490-530 Mpa, and hardness is HV 145-155, and elongation percentage is greater than
29%, it can be seen that by each technical indicator that spring steel band reaches, the spring steel band prepared using technical solution of the present invention, thickness
Tolerance and width tolerance fluctuation are small, and spring steel band is made to obtain stability, and are effectively improved the intensity of spring steel band, hardness and prolong
Rate is stretched, and then can satisfy demand of the automobile to damping effect, meanwhile, solve spring steel band preparation process's in the prior art
It is insufficient.
Step 9: immersion oil is packed.
Step 10: storage.
Schematically the present invention and embodiments thereof are described above, description is not limiting.So if
Those of ordinary skill in the art are inspired by it, without departing from the spirit of the invention, not inventively designs
Production method similar with the technical solution and embodiment out, are within the scope of protection of the invention.
Claims (3)
1. a kind of automotive high-performance damping spring strip production methods, it is characterised in that: it the following steps are included:
Step 1: raw material preparation；
Step 2: pickling；
Step 3: tandem rolling；
Step 4: carrying out first time annealing using bell furnace；
Step 5: rolling；
Step 6: slitting；
It anneals Step 7: carrying out second using bell furnace；
Step 8: product inspection；
Step 9: immersion oil is packed；
Step 10: storage；
Wherein:
Raw material in step 1 is 65Mn spring steel, chemical composition content are as follows: C:0.68%；S:0.002%；Mn:1.08%；P:
0.019%；Si:0.22%, raw material specification 3.5*170mm；
In the entire annealing process of step 4 and step 7, protective gas is passed through in bell furnace always；The guarantor being passed through in bell furnace
Protecting gas is the nitrogen and hydrogen gas mixture resolved by ammonia, volume content percentage are as follows: nitrogen accounts for 25%, and hydrogen accounts for
75%, and the flow control process of the protective gas includes preparation stage, heating and thermal insulation stage and cooling stage, wherein prepare
Stage: slowly opening intake valve, adjusts the flow of protective gas to 1.5m3/ h, and make quick-fried test of ringing after 1h, after qualified
Hot outer cover can be hung；The heating and thermal insulation stage: by the flow of protective gas by 1.5m at the beginning3/ h increases to 10m3/h；It is cooling
Stage: by the flow of protective gas by the 10m in heating and thermal insulation stage3/ h is adjusted to 1.5m again3/h；
In step 3, by three Continuous mill train of four-roller, 2% emulsion is greater than using concentration, carries out 3 passes, it will be through step
Raw material after rapid two pickling is rolled into the semi-finished product with a thickness of 2.8mm, and drafts per pass be respectively 0.4mm, 0.2mm and
0.1mm, the hardness of roll body of three Continuous mill train of four-roller are HRC62-63, and roller diameter is poor < 2mm, and upper and lower roll crown is less than 0.1mm, preceding 2
The roll surface roughness of passage is 0.1 μm, and the roll of rear 1 passage refines roller surface using CNC roll grinder,
Make 0.08 μm of roll surface roughness；
In step 4, specific annealing process are as follows:, with a thickness of in the semi-finished product investment bell furnace of 2.8mm, will first heat up in step 3
2 hours are kept the temperature to 450 DEG C, then is warming up to 550 DEG C with 35 DEG C per hour and keeps the temperature 3 hours, then be warming up to 720 DEG C with 30 DEG C per hour
Heat preservation 15 hours, and then heating mantles stop heating, naturally cool to 600 degree to in-furnace temperature, cooling time is that 10-16 is small
When, then heating mantles to be supportted into high 50cm and naturally cool to 550 DEG C, cooling time is 5-8 hour, it is finally air-cooled to water cooling after 280 DEG C,
80 DEG C are come out of the stove；
In step 5, by four-roller reversable cold-rolling machine, 2% emulsion is greater than using concentration, carries out 5 passes, it will be through step
Semi-finished product after rapid four annealing are rolled into the steel band with a thickness of 1.4mm, drafts per pass be respectively 0.4mm, 0.3mm,
0.3mm, 0.3mm and 0.1mm, the hardness of roll body of the four-roller reversable cold-rolling machine are as follows: HRC62-63, roller diameter is poor < 2mm, and up-down rollers are convex
Degree is less than 0.1mm, and the roll surface roughness of preceding 4 passage is 0.1 μm, and the roll of rear 1 passage is using CNC roll grinder to rolling
Roller surface is refined, and makes 0.08 μm of roll surface roughness；
In step 7, specific annealing process are as follows: by the semi-finished product investment bell furnace after step 6 slitting, be first warming up to 450 DEG C
Heat preservation 2 hours, then be warming up to 550 DEG C with 35 DEG C per hour and keep the temperature 3 hours, then be warming up to 720 DEG C of heat preservations 15 with 30 DEG C per hour
Hour, and then heating mantles stop heating, drop to 600 degree to in-furnace temperature, and cooling time is 10-16 hours, then by heating mantles
It supports high 50cm and naturally cools to 550 DEG C, cooling time is 5-8 hours, and last air-cooled to water cooling after 250 DEG C, 80 DEG C are come out of the stove.
2. a kind of automotive high-performance damping spring strip production methods according to claim 1, it is characterised in that: step
In two, using hydrochloric acid carry out pickling, concentration of hydrochloric acid 18-20%, 75-85 DEG C of pickling temperature, pickling speed 60m/min.
3. a kind of automotive high-performance damping spring strip production methods according to claim 1, it is characterised in that: step
Trimmed size in eight is 1.4*165mm, and finished product thickness deviation is negative 0.05mm, and width difference is negative 0.2mm, intensity 490-
530MPa, hardness are HV 145-155, and elongation percentage is greater than 29%.
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| CN113857240A (en) * | 2021-11-15 | 2021-12-31 | 瑞安市万川拉丝有限公司 | Production process of screw wire |
| CN114210730B (en) * | 2022-02-21 | 2022-04-26 | 山西太钢不锈钢精密带钢有限公司 | Production method for improving rolling efficiency of stainless steel precision strip steel |
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| CN102912101A (en) * | 2012-10-19 | 2013-02-06 | 攀钢集团成都钢钒有限公司 | Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod |
| CN105195510A (en) * | 2015-09-17 | 2015-12-30 | 武汉钢铁(集团)公司 | 8B cold-rolling precision steel belt and manufacturing method thereof |
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| CN105689392A (en) * | 2016-04-01 | 2016-06-22 | 莱芜市泰山冷轧板有限公司 | Production method for ultra-thin cold-rolled enamelled steel strips |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102912101A (en) * | 2012-10-19 | 2013-02-06 | 攀钢集团成都钢钒有限公司 | Production process of 65 Mn spring steel wire rod and 65 Mn spring steel wire rod |
| CN105195510A (en) * | 2015-09-17 | 2015-12-30 | 武汉钢铁(集团)公司 | 8B cold-rolling precision steel belt and manufacturing method thereof |
| CN105478471A (en) * | 2015-12-07 | 2016-04-13 | 安徽楚江科技新材料股份有限公司 | Method for improving surface quality of LED copper belt |
| CN105689392A (en) * | 2016-04-01 | 2016-06-22 | 莱芜市泰山冷轧板有限公司 | Production method for ultra-thin cold-rolled enamelled steel strips |
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