CN103521529B - The magnesium alloy plate operation of rolling quantizes lubricating method - Google Patents
The magnesium alloy plate operation of rolling quantizes lubricating method Download PDFInfo
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Abstract
The present invention discloses a kind of magnesium alloy plate operation of rolling and quantizes lubricating method, according to magnesium alloy materials characteristic, rolling mill practice system, appointed condition, determines the amounts of lubrication meeting boundary lubrication needs; Also will according to sheet material area, mill speed, interface temperature, determine the scaling loss amount of lubricant, consider, " quantification " is to surface spray-coating lubricant; In addition, also proposition lubricant particle will be attached to entrance side roll centre horizontal plane is on the roll surface of 45 ° of angular range; Nip for improving and reduce scaling loss, adopting the fuel supply method of in good time segmentation, namely sheet material head nip after fuel feeding, fuel cut-off when sheet material afterbody enters roll gap.The quantification lubricating method proposed according to the present invention implements lubrication, rolling magnesium alloy plate, through macroscopic observation, rolls rear roll surface, plate face light, there is not sticking phenomenon in roll surface, meets lubrication needs, after measured, after applying lubricant rolling, plate surface roughness is close with roll surface, the reduction of plate surface roughness.
Description
[technical field]
The invention belongs to metallurgy and Materials Processing Engineering technical field, be specifically related to the lubricating method of contact surface in Mg-based hydrogen storage plate rolling process.
[background technology]
Rolling is one of main method of Metal Forming, and the sheet material wherein provided to market by milling method is also the major product in metal material processing field.As a kind of light metal structure material, magnesium alloy is more and more subject to domestic and international extensive concern in recent years, due to the characteristic requirements of himself, usually hot rolling or warm-rolling is carried out being greater than between 225 DEG C to 500 DEG C, the same with during other metal material hot rollings, need to lubricate between roll and web contact interface.Its object is mainly: reduce roller, plate contact interface coefficient of friction, reduces energy consumption and tool wear; Prevent contact interface generation heat from sticking together, improve product surface quality, maintain and produce normal operation.Lubrication has anti-stickly falls the double action of rubbing, cooling, different from other material, and during magnesium alloy rolling, temperature controls very strict, makes every effort to complete as early as possible at certain temperature range.Both needed lubrication but can not because of lubrication temperature drop too fast (will temperature be ensured), if lubricant applies inequality can cause interface rapid heat cycle (uneven in temperature), meeting influence of rolled performance and product quality, produce waste product time serious, therefore balance lubrication and this contradiction of insulation during magnesium alloy rolling, will be noted.
During rolling, realizing effectively lubricating mainly affects by following factor: 1) metallic character, as Material Physics, chemical characteristic, and resistance of deformation etc.; 2) deformation characteristics, operation of rolling geometric parameter, plate surface long-pending (during rolling, because of metal extends the newborn face of generation, and surface area increases); 3) Technological Parameters of Rolling Process, each pass deformation, mill speed, temperature etc.; 4) the lubricant rheological equationm of state, flash-point, viscosity etc.
Magnesium is easy to oxidation in hot state, and surface film oxide is more loose, easily comes off.On some production line, rolling magnesium plate does not apply lubricant, although the operation of rolling also can be carried out, roll surface often sticks the oxide-film of one deck magnesium, and it is coarse, of poor quality to roll rear plate face.In hot state, matsurface is difficult to form fine and close diaphragm, causes oxidation to expand to metal inside.After rolling, for improving surface quality, adopting mechanical grinding product surface, also will clear up roll surface.Add production process, metal loss like this, also to environment.
During current magnesium alloy rolling, conventional method is that lubricating oil is sprayed at roll surface lubrication with mist, although other metals decrease lubricant quantity relatively, whether lacks computational analysis in right amount.For magnesium alloy, lubricant applies not enough, can cause tool wear and glutinous roller, makes plate face produce defect and affect surface quality.If lubricant is too much, can affect and nip, also can reduce roll and magnesium plate contact interface temperature, when the temperature that roller board interface temperature requires lower than rolling mill practice, plate face can crack, and affects normal rolling.In addition, when Warm status lubricates, lubricant meeting volatilization loss, both added production cost, the oil smoke of generation also pollutes the environment.
As the applying method of lubricant, be all from fuel tank, draw lubricating oil by work oil pump usually, then spray in roll surface from the nozzle by being arranged on roll side through oil pipe.During rolling, between each passage, have interval, especially to magnesium alloy plate, cogging and in, finish rolling, adopt the rolling of block formula method, its interval total time is long, and lubricant sprays continuously in roll surface, must cause roll surface temperature drop and volatilization more.
As previously mentioned, on some production line, rolling magnesium plate does not apply lubricant.Result roll surface often sticks one deck magnesium oxide-film, and it is coarse to roll rear plate face, needs product surface of polishing, also will clear up roll surface.Both add production process, metal loss, cause environmental pollution again.Unlubricated rolling still can improve surface quality for slab by polishing, but is then difficult to for thin plate the requirement meeting surface quality, dimensional accuracy, and technical difficulty increases, and when producing in batches, polishing workload is very large.Adopt suitable lubricating method, substituting unlubricated rolling, is the inevitable choice realizing magnesium alloy high-quality, high accuracy, high efficiency rolling.
When magnesium alloy lubrication and rolling, lubricant should be applied and reduce friction, reduce tool wear and prevent roll surface to stick together, improve quality, can not nip because applying lubricant impact again, or be reduced to rolling mill practice temperature under making temperature, there is crackle in plate face, produces waste product or the operation of rolling can not be carried out.According to magnesium alloy operational characteristic, (magnesium alloy) mainly adopts heat, warm deformation, and temperature controls very strict, makes every effort to complete process as early as possible at certain temperature range.Under natural environmental condition, (deformed area) temperature drop speed is very fast, and lubrication has the anti-stick double action of rubbing, cooling of falling, thus implementing the contradiction that will balance solution when effectively lubricating and strict temperature control just become magnesium alloy rolling, is also an important technical problem.
Lubrication is applied during magnesium alloy rolling, very important to realizing stable rolling.And the current cogging of magnesium alloy and in, finish rolling, adopt the rolling of block formula method, need frequently to nip, when roll surface continuous spray lubricating oil, contact surface coefficient of friction reduces, and rolled piece skids in porch, and often impact is nipped, and production can not normally be carried out more.In addition, oil is heated must volatilizees at roll surface, causes environmental pollution, also can increase loss, raise the cost.This just needs the feature for different affecting factors, considers, and adopts suitable lubrication skill.
In addition, although adopt spray-on process to spray lubricant to roll in producing, but lubricant particle spray range is larger, usually to be attached near entrance side roll centre horizontal plane on roll surface, roller board interface and plate face, spraying amounts of lubrication often regulates with experience, often making lubrication uneven, easily there is rapid heat cycle in interface, causes quality problems and lubricant volatilization.If lubricant is at plate remained on surface and be heated and unevenly easily stay oil mark, finished product is easy cleaning not, affects product surface quality.Need experiment to investigate, conservative control lubricant particle is at the attachment position of roll surface.
During magnesium alloy plate rolling, lubrication has anti-stick effect of falling surface quality of rubbing, improve, and can produce simultaneously and cool, if lubricant applying is improper, not only impact is nipped, and plate face also can be made to crack, affect normal rolling because temperature drop is too fast.Solving this contradiction to balance, needing a kind of method finding reasonable applying lubricant.
[summary of the invention]
The object of the invention is to propose a kind of magnesium alloy plate operation of rolling and quantize lubricating method, according to magnesium alloy materials characteristic, rolling mill practice system, appointed condition, by controlling consumption and the spraying position of lubricant, to solve the problems of the technologies described above.
To achieve these goals, the present invention adopts following technical scheme:
The magnesium alloy plate operation of rolling quantizes lubricating method, comprises the following steps:
1), before N passes, entrance side thickness of slab H, the wide B of plate, the long L of plate, access panel speed Vo, roller speed Vr, outlet side thickness of slab h, roll surface roughness R when measuring magnesium alloy plate rolling
1with magnesium alloy plate surface roughness R
2; N is positive integer;
2), when starting N passes, upper and lower two nozzles are regulated at the uniform velocity to spray lubricating oil respectively to topping roll and bottom roll; In the rolling time t that N passage is corresponding, the total fuel delivery of two nozzles is:
Q＝n2t BVo(ξ
0ρ+q
Tt) (11)
Wherein, coefficient n=0.8-1.2; ξ
0for entrance oil film thickness; ρ--lubricating oil density, g/cm
3; q
tfor the scaling loss amount in lubricating oil unit interval unit are, g/sm
2; q
tt is the scaling loss amount in the t time in lubricating oil unit interval unit are, g/m
2; T is rolling time, t=L/Vo;
ξ
0＝2λKRa/(λ+1) (5)
Wherein, λ=1/ (1-ε), Ra=(R
1 2+ R
2 2)
1/2; ε is working modulus; K is lubricating coefficient.
The present invention further improves and is: when cogging and roughing, R
1for 1.6-6.5 μm, R during middle finish rolling
1for 0.2-0.8 μm.
The present invention further improves and is: when cogging and roughing, K ﹤ 3; During middle finish rolling, K=0.4-1.0.
The present invention further improves and is: step 2) in, after magnesium alloy plate head is nipped, upper and lower two nozzles at the uniform velocity spray lubricating oil respectively to topping roll and bottom roll, fuel cut-off when magnesium alloy plate afterbody enters roll gap.
The present invention further improves and is: it is on the roll surface of 45 ° of angular range that the lubricating oil particle of top nozzle ejection is attached to entrance side topping roll central horizontal face, and it is on the roll surface of 45 ° of angular range that the lubricating oil particle of lower nozzle ejection is attached to entrance side bottom roll central horizontal face; And lubricating oil all sprays in corresponding roll centre horizontal plane and the roller surface that rolls between seam.
The present invention further improves and is: when cogging and roughing, and working modulus is 10%-20%; During middle finish rolling, working modulus is 5%-10%.
The present invention further improves and is: step 2) in the temperature of rolling be 225 DEG C to 500 DEG C.
The present invention further improves and is: step 2) in rolling time roll temperature be 200 ~ 250 DEG C.
The present invention further improves and is: step 2) described in lubricating oil adopt No. 10 machine oil.
The magnesium alloy plate operation of rolling quantizes lubricating method, the magnesium alloy plate operation of rolling according to any one of claim 1 to 8 is adopted to quantize lubricating method, in conjunction with rolling schedule calculate all rolling passes lubricating oil fuel delivery and stored in computer, computer controls when rolling to oil mouth and the lower oil nozzle fuel delivery according to calculated corresponding passage, at the uniform velocity fuel feeding is started after sheet material head is nipped, fuel cut-off when sheet material afterbody enters roll gap, until complete the whole operation of rolling.
Relative to prior art, the present invention has following beneficial effect: the present invention, according to magnesium alloy materials characteristic, rolling mill practice system, appointed condition, determines the amounts of lubrication meeting boundary lubrication needs; Also will according to sheet material area, mill speed, interface temperature, determine the scaling loss amount of lubricant, consider, " quantification " is to surface spray-coating lubricant.In addition, also proposition lubricant particle will be attached to entrance side roll centre horizontal plane is on the roll surface of 45 ° of angular range; Nip for improving and reduce scaling loss, adopting the fuel supply method of in good time segmentation, namely sheet material head nip after fuel feeding, fuel cut-off when sheet material afterbody enters roll gap.The quantification lubricating method proposed according to the present invention implements lubrication, rolling magnesium alloy plate, through macroscopic observation, rolls rear roll surface, plate face light, there is not sticking phenomenon in roll surface, meets lubrication needs, after measured, after applying lubricant rolling, plate surface roughness is close with roll surface, the reduction of plate surface roughness.
During magnesium alloy rolling, rapid heat cycle reduces rolling performance, and except control lubricant quantity for spray, lubricant particle also has a direct impact the smooth rolling of magnesium alloy plate, surface quality in roll surface attachment position, uniformity.In current technology, lubricant particle is attached on the roll surface near entrance side roll centre horizontal plane usually, or be attached on roller board interface and plate face, lubricating oil quantity for spray often regulates with experience, easily cause the uneven and excessive scaling loss of roller plate surface cool, the lubricant particle of application claims ejection be attached to entrance side roll centre horizontal plane be 45 ° of angular range roll surface on (see Fig. 1), lubricant can be reduced like this in the roll surface time of staying, minimizing oil consumption and roll surface temperature drop.In addition, the roll surface lower than plate surface temperature has pre-heat effect to lubricating oil, preventing board face rapid heat cycle.
For the ease of nipping and preventing the unlubricated metal that causes from sticking roll surface, when materials such as rolling stainless steels, rolled piece starts fuel feeding before nipping, roll rear fuel cut-off (Heisei 6 years Application Publication 6-234989).When stainless steels etc. are metal rolled, oxide-film stickiness is large, and workpiece front end does not go out the necessary fuel feeding of roll gap with tail end before nipping, in case there is roll surface to stick thing damage plate face.The present invention is according to magnesium plate rolling mill practice characteristic, nip for improving and reduce scaling loss, adopt the fuel supply method of in good time segmentation, namely fuel cut-off when rolled piece tail end enters roll gap, roller rotational process roll surface oil residues can be heated and be volatilized or burn, roll surface coefficient of friction increases to be convenient to nip, fuel feeding immediately after workpiece front end is nipped.Described in this and aforementioned Heisei 6 years Application Publication 6-234989, method is different, before magnesium alloy workpiece front end is nipped and tail end enter after roll gap can not fuel feeding, because its oxide-film loosens, easily come off after fuel feeding, fuel cut-off is that improvement is nipped and reduces oil consumption.
[accompanying drawing explanation]
Fig. 1 is the schematic diagram of the operation of rolling;
Fig. 2 is schematic flow sheet of the present invention;
Fig. 3 is the scaling loss amount schematic diagram of No. 10 machine oil different temperatures in unit interval unit are;
Fig. 4 is the comparison diagram adopting rolling under the inventive method and unlubricated state.
[detailed description of the invention]
Below in conjunction with drawings and Examples, the invention will be further described.
Refer to shown in Fig. 1 and Fig. 2, the magnesium alloy plate operation of rolling of the present invention quantizes lubricating method, first will detect and understand and be rolled magnesium alloy plate Wuli-Shili-Renli system approach, operation of rolling geometric parameter, Technological Parameters of Rolling Process, the lubricant rheological equationm of state.Understand correlation and computational methods between relevant parameters.
Then determining the magnesium plate computational methods that lubricant quantizes when rolling according to lubrication theory and experiment, determining the unit interval by calculating, enter roll gap sheet material area and lubricate merely required lubricant supply q.Represent as asking the general expression of lubricant quantity delivered (1) formula:
q＝f(ξ、H、h、B、S、V0、Vr、t、T、ε、Ra、λ) (1)
In formula: the thickness (mm) before H-plate rolling; Thickness (mm) after h-plate rolling; B-strip width (mm); V0-sheet material entrance velocity (mm/s); Vr-roll rotational speed (mm/s); ξ-oil film thickness (μm); T-one-pass roller time (s); S-rolling header board face amasss (mm
2) T-rolling temperature (° c); Q-lubricants capacity (unit interval, unit are); λ-lengthening coefficient; ε-working modulus; Ra-roughness (μm).
In order to calculate the lubricant supply q needed for simple lubrication, first calculate the oil film thickness ξ determining that plate surface is suitable.; During due to other materials such as aluminum, copper, steel, lubricant at roll surface, except lubrication, needs cooling control roll temperature with Fluid injection.But magnesium alloy carries out hot rolling or warm-rolling usually between 225 DEG C to 500 DEG C, and deformation temperature is lower, temperature controls very strict, makes every effort to complete as early as possible at certain temperature range, fast at natural environment temperature drop, therefore the main lubricant supply considered needed for simple lubrication.The calculating of oil film thickness is in the past the mechanism entering deformed area according to lubricant, and under the effect of entrance side lubrication angle of wedge pressure, the oil film thickness entering deformed area with fluid, to determine computing formula, is then not suitable for for magnesium alloy.Here quote consider lengthening coefficient rolling before and after oil film thickness relational expression:
ξ
1＝(λ+1)ξ
0/2λ (2)
In formula: ξ
1-deformed area outlet oil film thickness;
ξ
0---deformed area entrance oil film thickness;
λ---lengthening coefficient;
In addition, the mechanism analysis of deformed area is entered from lubricant, magnesium alloy is to realize for the purpose of rolling lubrication, only consider the oil mass that simple lubrication needs, the effect of removing lubrication angle of wedge pressure, lubricant enters deformed area and mainly relies on the effect of carrying secretly of the uneven body of roller plate surface dimpling, lubricant and contact interface and to interact the adsorbed film effect generated.According to lubricating status, when cogging and roughing, outlet side lubricating status is set as mixed lubrication or filmlubrication, load is directly come in contact by the partial hydrodynamic lubrication film existed between friction in pairs surface and micro-bulge and bears.At this moment, ingot blank length is little, and nipping frequent, is target with thinning, and drafts is large, extends large.Nipping for improving, increasing drafts, usual pass reduction 10%-20%, roll surface roughness requirements is comparatively large, can establish cogging and shaping roll surface roughness R
1for 1.6-6.5 μm.
During middle finish rolling, outlet side lubricating status is set as boundary lubrication, load is born with the boundary lubricant film that the interphase interaction on surface generates by micro-bulge and lubricant.This one-phase, plate is while thinning, and consider dimensional accuracy, surface quality, working modulus is less, usual pass reduction 5%-10%, and roll surface roughness requirements is less, can establish middle planishing roll surface roughness R
1for 0.2-0.8 μm.
During rolling, the magnesium alloy plate surface roughness forming friction pair depends primarily on roll surface, and rolling generally adopts multi-pass, and each passage roller after cogging, plate roughness can think identical.Roller plate roughness to board surface quality requirement, can determine range regulation, general descending selection according to rolling sequence.Composite roughness calculating formula is:
Ra＝(R
1 2+R
2 2)
1/2(3)
In formula: R
1, R
2be respectively roller, plate surface roughness value, Ra is composite roughness value.
The general formula of oil film thickness ξ determined according to lubricating status is:
In ξ=K Ra (μm) formula: COEFFICIENT K is than oil film thickness (4)
(mixed lubrication COEFFICIENT K ﹤ 3, boundary lubrication COEFFICIENT K=0.4-1.0, general descending selection)
At this, setting cogging, roughing and middle finish rolling time deformed area outlet oil film thickness ξ
1corresponding with mixed lubrication and borderline oil film thickness ξ respectively.Namely affect by factors vary such as plate rolling stage, lubricating status, corresponding oil film thickness ξ
1capital changes, in other words ξ
1change with rolling condition change.
ξ in (4) formula is replaced by ξ
1, substitute into (2) formula, arrange:
ξ
0＝ξ
12λ/(λ+1)＝KRa2λ/(λ+1) (5)
By repeatedly testing, observing and rolling rear roll surface state, with stereomicroscope observation plate surface state, determining oil film thickness ξ
0oil film thickness calculated value is quantized as deformed area entrance.
Entrance side thickness of slab H, the wide B of plate, the long L of plate, access panel speed Vo, roller speed Vr, outlet side thickness of slab h during measurement rolling; Calculate lengthening coefficient λ, λ=H/h.
First calculate and determine that the rolling pass unit interval enters the area of sheet metal of roll gap, before and after plate rolling, width can think constant, and the unit interval enters roll gap sheet material area S
1as shown in the formula:
S
1＝BVo (6)
Enter the sheet material area formula of roll gap according to (5) formula oil film thickness and (6) formula unit interval, show that the unit interval enters the theory calculate oil mass q that roll gap sheet material area lubricates merely needs
1:
q
1＝ξ
0S
1ρ＝BVoξ
0ρ (7)
ρ--lubricating oil density (g/cm
3)
The magnesium alloy plate operation of rolling of the present invention quantizes lubricating method, and owing to being lubricate in hot state, sheet material temperature is generally 250 DEG C of ° of-500 DEG C of scopes, and lubricating oil is heated can scaling loss.Scaling loss gauge calculate by rolling temperature as variable, can design a model, by experiment to modular form through repeatedly revising, to obtain data carry out regression analysis; Also directly can obtain the relation curve describing temperature and scaling loss amount by experiment, as shown in Figure 3, represent the scaling loss amount q of No. 10 machine oil different temperatures in unit interval unit are
t, in conjunction with (6) formula S
1=BVo, obtains the lubricants capacity q of different temperatures lower unit interval scaling loss
2, represent with following formula (8):
q
2＝BLq
T＝BVoq
Tt (8)
Determine the oil mass q to the simple lubrication of roll surface supply
1with the oil mass q of scaling loss of being heated
2, with regard to there being unit interval needs to the lubricants capacity of surface spray-coating be:
q＝q
1+q
2(8)
In addition, the sheet material of certain length L, during with entrance velocity Vo rolling, equals the supply time of this passage by the time of milling train, and time t (9) formula represents:
t＝L/Vo (9)
(5) formula is arranged to (9) formula, then has and determine passage sheet material two total surface fuel delivery Q:
Q＝2qt＝2t(q
1+q
2) (10)
Q is and determines rolling pass total fuel delivery of theory to sheet material two surface in time t.By rolling experiment, access panel surface macrostate, be multiplied by coefficient n to (10) formula and revise, practice can meet lubricating requirement, and Amount of actual oil supply Q is:
Q＝n2qt＝n2t(q
1+q
2)＝n2t BVo(ξ
0ρ+q
Tt) (11)
In formula (11), the span of n is 0.8-1.2;
When cogging, roughing, plate surface roughness, drafts are large, the top limit choosing of n value; During middle finish rolling, the little n value of plate surface roughness, drafts limits choosing on the lower.
Refer to shown in Fig. 1 and Fig. 2, the magnesium alloy plate operation of rolling of the present invention quantizes lubricating method, comprises the following steps:
1) entrance side thickness of slab H, the wide B of plate, the long L of plate, access panel speed Vo, roller speed Vr, outlet side thickness of slab h, roll surface roughness R during measurement magnesium alloy plate rolling
1, magnesium alloy plate surface roughness R to be rolled
2;
2) entrance oil film thickness ξ is calculated by (5) formula
0:
ξ
0＝2λKRa/(λ+1) (5)
In formula: get λ=1/ (1-ε), Ra=(R
1 2+ R
2 2)
1/2
Cogging and roughing R
1be set to 1.6-6.5 μm, middle finish rolling R
1be set to 0.2-0.8 μm; During multi-pass rolling, the passage after cogging, can get R
1=R
2.When cogging and roughing, mixed lubrication COEFFICIENT K ﹤ 3; During middle finish rolling, boundary lubrication COEFFICIENT K=0.4-1.0.The descending selection of above parameter.
3) by the oil mass that (7) formula unit of account time lubricates merely;
Unit interval enters the sheet material area S of roll gap
1=BVo
Passes time t=L/Vo
q
1＝ξ
0S
1ρ＝＝ξ
0BVoρ (7)
Wherein, ρ--lubricating oil density (g/cm
3)
4) lubricating oil scaling loss amount q is calculated by (8) formula
2:
q
2＝Bvoq
Tt (8)
5) rolling pass total fuel delivery to sheet material two surface in time t is determined with the calculating of (11) formula.
Q＝n2qt＝n2t(q
1+q
2)＝n2t BVo(ξ
0ρ+q
Tt) (11)
During due to rolled plate, be all multi-pass rolling usually, for the ease of the quantity delivered of grasp lubricant, ensure to produce normal operation, can the list calculating in the lump when basketry flow process.Aforementioned relevant fuel delivery calculating formula can input computer, and combined process is formulated, easy to use.
6) when starting rolling, regulate nozzle, the lubricant particle of ejection is attached to entrance side roll centre horizontal plane be (Fig. 1 is shown) on the roll surface of 45 ° of angular range; Want in good time segmentation fuel feeding, namely sheet material head nip after fuel feeding, fuel cut-off when sheet material afterbody enters roll gap.
Embodiment 1
Known AZ31 magnesium alloy rough rolling plate blank is of a size of 2000 × 600 × 10 (㎜), rolling temperature 400 DEG C, rolling schedule 10-8.0-7.8-6.63-6.0, mill rolls speed Vr=1.0m/s, sheet material entrance velocity is approximate to be calculated with Vo=Vr/ λ, all the other each Selecting parameter and computing reference preceding method; During rolling, the temperature of roll is 200 ~ 250 DEG C.Lubricating oil No. 10 machine oil dopings, proportion 0.9g/ ㎝
3, coefficient n selects 1, quantizes fuel feeding result of calculation in table 1.
Magnesium alloy roughing lubricating oil quantizes supply code table 1
Wherein, R
12refer to R
1=R
2=R
12, the roughness of getting roll calculates.
(note: owing to can burn with full oil lubrication during high temperature, therefore more than 450 DEG C can adopt emulsion lubrication.)
Embodiment 2
Known AZ31 magnesium alloy finish rolling size of plate blank is 3000 × 600 × 6.0, rolling temperature 350 DEG C, pass reduction is maximum is no more than 10%, rolling schedule 6.0-5.4-4.9-4.5-4.2-4.0, roller speed Vr=1.0m/s, sheet material entrance velocity is approximate to be calculated with Vo=Vr/ λ, all the other each Selecting parameter and computing reference preceding method; During rolling, the temperature of roll is 200 ~ 250 DEG C.Lubricant No. 10 machine oil dopings, proportion 0.9g/ ㎝
3, coefficient n selects 1, quantizes fuel feeding result of calculation in table 2.
Roll lubricating oil in magnesium alloy and quantize supply code table 2
Wherein, R
12refer to R
1=R
2=R
12, the roughness of getting roll calculates.
(note: owing to can burn with full oil lubrication during high temperature, therefore more than 450 DEG C can adopt emulsion lubrication.)
When the operation of rolling implements lubrication, regulate nozzle 2, on the roll surface lubricant particle of ejection being attached to entrance side roll 1 central horizontal face be 45 ° of angular range (see Fig. 1, wherein 1 is roll, and 2 is atomizers, and 3 is magnesium alloy plates).The roller surface that the lubricant particle that nozzle 2 sprays directly is attached to roll centre horizontal plane and rolls between seam, the rotation along with roll is finally attached to magnesium alloy plate 3 surface.
The operation of rolling, adopts the fuel supply method of in good time segmentation, namely after sheet material is nipped immediately to roll surface fuel feeding, fuel cut-off when sheet material tail end enters roll gap.
Refer to shown in Fig. 4, the effect (finish rolling test) after the invention process: the quantification lubricating method proposed according to the present invention implements lubrication, rolling AZ31 magnesium alloy plate, through macroscopic observation, roll rear roll surface, plate face light, there is not sticking phenomenon in roll surface, meets lubrication needs.After unlubricated rolling, plate face is coarse, and has friction impression.After measured, after applying lubricant rolling, plate surface roughness is close with roll surface, the reduction of plate surface roughness.After unlubricated rolling, plate surface roughness is apparently higher than reset condition, shows that interface adheres to.
Claims (6)
1. the magnesium alloy plate operation of rolling quantizes lubricating method, it is characterized in that, comprises the following steps:
1), before N passes, entrance side thickness of slab H, the wide B of plate, the long L of plate, access panel speed Vo, roller speed Vr, outlet side thickness of slab h, roll surface roughness R when measuring magnesium alloy plate rolling
1with magnesium alloy plate surface roughness R
2; N is positive integer;
2), when starting N passes, upper and lower two nozzles are regulated at the uniform velocity to spray lubricating oil respectively to topping roll and bottom roll; In the rolling time t that N passage is corresponding, the total fuel delivery of two nozzles is:
Wherein, n=0.8-1.2; ξ
0for entrance oil film thickness; ρ--lubricating oil density, g/cm
3;
for the scaling loss amount in lubricating oil unit interval unit are, g/sm
2;
for the scaling loss amount in lubricating oil unit are in the t time, g/m
2; T is rolling time, t=L/Vo;
ξ
0＝2λKRa/(λ+1) (5)
Wherein, λ=1/ (1-ε), Ra=(R
1 2+ R
2 2)
1/2; ε is working modulus; K is lubricating coefficient.
2. the magnesium alloy plate operation of rolling according to claim 1 quantizes lubricating method, it is characterized in that, when cogging and roughing, and R
1for 1.6-6.5 μm, R during middle finish rolling
1for 0.2-0.8 μm.
3. the magnesium alloy plate operation of rolling according to claim 1 quantizes lubricating method, it is characterized in that, when cogging and roughing, and K ﹤ 3; During middle finish rolling, K=0.4-1.0.
4. the magnesium alloy plate operation of rolling according to claim 1 quantizes lubricating method, it is characterized in that, step 2) in, after magnesium alloy plate head is nipped, upper and lower two nozzles at the uniform velocity spray lubricating oil respectively to topping roll and bottom roll, fuel cut-off when magnesium alloy plate afterbody enters roll gap.
5. the magnesium alloy plate operation of rolling according to claim 1 quantizes lubricating method, it is characterized in that, it is on the roll surface in 45 ° of angular range that the lubricating oil particle of top nozzle ejection is attached to entrance side topping roll central horizontal face, and it is on the roll surface in 45 ° of angular range that the lubricating oil particle of lower nozzle ejection is attached to entrance side bottom roll central horizontal face; And lubricating oil all sprays in corresponding roll centre horizontal plane and the roller surface that rolls between seam.
6. the magnesium alloy plate operation of rolling quantizes lubricating method, it is characterized in that, the magnesium alloy plate operation of rolling according to any one of claim 1 to 5 is adopted to quantize lubricating method, in conjunction with rolling schedule calculate all rolling passes lubricating oil fuel delivery and stored in computer, computer controls when rolling to oil mouth and the lower oil nozzle fuel delivery according to calculated corresponding passage, after sheet material head is nipped, start at the uniform velocity fuel feeding, fuel cut-off when sheet material afterbody enters roll gap, until complete the whole operation of rolling.
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| CN113134767B (en) * | 2021-04-28 | 2022-11-15 | 太原理工大学 | Nano lubricating method for improving surface quality of corrugated roller hot-rolled metal plate |
| CN113210431A (en) * | 2021-04-28 | 2021-08-06 | 太原理工大学 | Method for improving surface quality of corrugated roller cold-rolled metal sheet based on nano lubrication |
| CN113210432A (en) * | 2021-04-28 | 2021-08-06 | 太原理工大学 | Lubricating process method for improving surface quality of corrugated roller rolled metal sheet |
| CN113210433A (en) * | 2021-04-28 | 2021-08-06 | 太原理工大学 | Method for optimizing surface microstructure of metal ultrathin strip |
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| CN101253007A (en) * | 2005-09-02 | 2008-08-27 | Sms迪马格股份公司 | Method for lubricating and cooling rollers and metal strips on rolling in particular on cold rolling of metal strips |
| CN102240676A (en) * | 2011-05-11 | 2011-11-16 | 北京科技大学 | Rolling device for preparing high-toughness high-formability magnesium alloy sheet strip coil |
| CN102264882A (en) * | 2008-12-25 | 2011-11-30 | 花王株式会社 | Lubricating oil for hot rolling oil and process for manufacturing hot-rolled sheet |
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| JP2004117117A (en) * | 2002-09-25 | 2004-04-15 | Kobe Steel Ltd | Estimation method of introduction oil film thickness in metal rolling |
| JP2009040954A (en) * | 2007-08-10 | 2009-02-26 | Daido Chem Ind Co Ltd | Lubricant composition for warm working of magnesium and magnesium alloy |
| JP2009125751A (en) * | 2007-11-19 | 2009-06-11 | Mitsubishi Alum Co Ltd | Method of manufacturing rolled stock of magnesium alloy |
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| CN101253007A (en) * | 2005-09-02 | 2008-08-27 | Sms迪马格股份公司 | Method for lubricating and cooling rollers and metal strips on rolling in particular on cold rolling of metal strips |
| CN102264882A (en) * | 2008-12-25 | 2011-11-30 | 花王株式会社 | Lubricating oil for hot rolling oil and process for manufacturing hot-rolled sheet |
| CN102240676A (en) * | 2011-05-11 | 2011-11-16 | 北京科技大学 | Rolling device for preparing high-toughness high-formability magnesium alloy sheet strip coil |
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