CN103521529A - Quantized lubricating method in rolling process of magnesium alloy sheet materials - Google Patents
Quantized lubricating method in rolling process of magnesium alloy sheet materials Download PDFInfo
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Abstract
The invention discloses a quantized lubricating method in the rolling process of magnesium alloy sheet materials. According to the features of the magnesium alloy materials, rolling process systems and equipment conditions, the amount of lubricants required for meeting interface lubricating is determined; furthermore, according to sheet material area, rolling speed, and interface temperature, the burning loss amount of the lubricants is determined, and the lubricants are sprayed onto a roll surface in a quantized mode for overall consideration; besides, lubricant particles should be attached to the position, within 45-degree included angle range between the central horizontal plane of a roller on the inlet side, of the roll surface; in order to improve biting-in and reduce burning loss, a timely and segmented oil supply method is adopted, namely, oil is supplied after the head portions of the sheet materials are bit in, and oil supplying is stopped when the tail portions of the sheet materials enter roll bites. Lubricating is carried out according to the quantized lubricating method for rolling the magnesium alloy sheet materials, through macroscopic observation, the roll surface and a sheet surface are light and smooth after being rolled, the adhesion phenomenon of the roll surface does not happen, and therefore the requirement for lubricating is satisfied; through measurement, the sheet surface is close to the roll surface in roughness after being rolled with the lubricants applied, and the roughness of the sheet surface is reduced.
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 magnesium and the magnesium alloy plate operation of rolling.
[background technology]
Rolling is one of main method of Metal Forming, and the sheet material wherein providing 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, conventionally between 225 ℃ to 500 ℃, carry out hot rolling or warm-rolling being greater than, the same during with other metal material hot rollings, between roll and sheet material contact interface, need to lubricate.Its object is mainly: reduce roller, plate contact interface coefficient of friction, reduce energy consumption and tool wear; Prevent that contact interface generation heat from sticking together, improve product surface quality, maintain and produce normal operation.Lubricated have the anti-stick double action of rubbing, cooling of falling, different from other material, and during magnesium alloy rolling, temperature is controlled very strictly, makes every effort to complete as early as possible at certain temperature range.Both needed lubricated but can not be because of lubricated temperature drop too fast (will guarantee temperature), if applying inequality, lubricant can cause interface rapid heat cycle (uneven in temperature), meeting influence of rolled performance and product quality, when serious, produce waste product, thus to note during magnesium alloy rolling balance lubricated with this contradiction of insulation.
During rolling, realize effectively lubricating and affected by following factor: 1) metallic character, as Material Physics, chemical characteristic, 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 that produces, and surface area increases); 3) Technological Parameters of Rolling Process, each pass deformation, mill speed, temperature etc.; 4) flow of lubricant change nature, flash-point, viscosity etc.
Magnesium is easy to oxidation under 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, rolls rear plate face coarse, of poor quality.Under hot state, matsurface is difficult to form fine and close diaphragm, causes to be oxidized to expand to metal inside.After rolling, for improving surface quality, adopt mechanical grinding product surface, also will clear up roll surface.Do like this and increased production process, metal loss, also to environment.
During current magnesium alloy rolling, conventional method is lubricating oil to be sprayed to roll surface with vaporific form lubricate, although other metals have reduced lubricant quantity relatively, whether lacks in right amount computational analysis.For magnesium alloy, lubricant applies deficiency, can cause tool wear and glutinous roller, makes plate face produce defect and affects surface quality.If lubricant is too much, can affect and nip, also can reduce roll and magnesium plate contact interface temperature, when temperature that roller board interface temperature requires lower than rolling mill practice, plate face can crack, and affects normal rolling.In addition, when hot state is lubricated, lubricant meeting volatilization loss, had both increased production cost, and the oil smoke of generation also pollutes the environment.
As the applying method of lubricant, be all conventionally by work oil pump from fuel tank, draw lubricating oil, then through oil pipe from the nozzle ejection by being arranged on roll one side in roll surface.During rolling, between each passage, have intermittently, especially to magnesium alloy plate, cogging and in, finish rolling, adopt the rolling of piece formula method more, its intermittently total time long, lubricant continuous injection, in roll surface, must cause roll surface temperature drop and volatilization.
As previously mentioned, on some production line, rolling magnesium plate does not apply lubricant.Result roll surface often sticks one deck magnesium oxide-film, rolls rear plate face coarse, and the product surface of need to polishing, also will clear up roll surface.Both increase production process, metal loss, caused again environmental pollution.Unlubricated rolling still can improve surface quality for slab by polishing, but for thin plate, is difficult to meet the requirement of surface quality, dimensional accuracy, and technical difficulty increase, and when batch production, polishing workload is very large.Adopting suitable lubricating method, substitute unlubricated rolling, is the inevitable choice that realizes magnesium alloy high-quality, high accuracy, high efficiency rolling.
When magnesium alloy lubrication and rolling, should apply lubricant and reduce friction, reduce tool wear and prevent roll surface to stick together, improve quality, can not nip because applying lubricant impact again, or make to be reduced to rolling mill practice temperature at temperature, plate face generation crackle, produces waste product or the operation of rolling can not be carried out.According to magnesium alloy operational characteristic, (magnesium alloy) main heat, warm deformation of adopting, temperature is controlled very strict, makes every effort to complete as early as possible process at certain temperature range.Under natural environmental condition, (deformed area) temperature drop speed is very fast, and lubricate, there is the anti-stick double action of rubbing, cooling of falling, thereby implement effectively lubricating and the strict contradiction of wanting balance to solve when temperature just becomes magnesium alloy rolling of controlling, be also an important technical problem.
During magnesium alloy rolling, apply lubricated, very important to realizing stable rolling.And the current cogging of magnesium alloy and in, finish rolling, adopt the rolling of piece formula method more, need to frequently nip, when roll surface continuous spray lubricating oil, contact-making surface coefficient of friction reduces, rolled piece skids in porch, often impact is nipped, and makes to produce normally to carry out.In addition, oil is heated and must volatilizees at roll surface, causes environmental pollution, also can increase loss, raises the cost.This just need to consider for the feature of different affecting factors, adopts suitable lubricated skill.
In addition, although adopt spray-on process to spray lubricant to roll in producing, but lubricant particle spraying scope is larger, conventionally be attached near the roll surface of entrance side roll central horizontal face, roller board interface and plate face, spraying amounts of lubrication often regulates with experience, often make lubricated inhomogeneously, easily there is rapid heat cycle in interface, causes quality problems and lubricant volatilization.If lubricant is at plate remained on surface and the inhomogeneous oil mark that easily stays that is heated, finished product is easy cleaning not, affects product surface quality.Need experiment to investigate, rationally control lubricant particle at the attachment position of roll surface.
During magnesium alloy plate rolling, lubricated have the anti-stick effect that rubs, improves surface quality of falling, and can produce and cool simultaneously, improper if lubricant applies, and not only impact is nipped, and because temperature drop is too fast, also can make plate face crack, and affects normal rolling.For balance solves this contradiction, need to find a kind of method that rationally applies 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 the rolling of N passage, entrance side thickness of slab H, the wide B of plate, the long L of plate, access panel speed Vo, the fast Vr of roller, outlet side thickness of slab h, roll surface roughness R while measuring magnesium alloy plate rolling
1with magnesium alloy plate surface roughness R
2; N is positive integer;
2), while starting the rolling of N passage, regulate upper and lower two nozzles to topping roll and bottom roll, at the uniform velocity to spray lubricating oil respectively; In rolling time t corresponding to N passage, two total fuel deliveries of nozzle are:
Q=n2t BVo(ξ
0ρ+qT) （11）
Wherein, coefficient n=0.8-1.2; ξ
0for entrance oil film thickness; ρ--lubricating oil density, g/cm
3; QT is the scaling loss amount in lubricating oil unit interval unit are, g/sm
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, and R
1for 1.6-6.5 μ m, R during middle finish rolling
1for 0.2-0.8 μ m.
The present invention further improves and is: when cogging and roughing, and K ﹤ 3; During middle finish rolling, K=0.4-1.0.
The present invention further improves and is: step 2), after magnesium alloy plate head is nipped, upper and lower two nozzles at the uniform velocity spray lubricating oil to topping roll and bottom roll respectively, fuel cut-off when magnesium alloy plate afterbody enters roll gap.
The present invention further improves and is: the lubricating oil particle of top nozzle ejection is attached to entrance side topping roll central horizontal face and is on the roll surface of 45 ° of angular range, and the lubricating oil particle of lower nozzle ejection is attached to entrance side bottom roll central horizontal face and is on the roll surface of 45 ° of angular range; And lubricating oil all sprays in corresponding roll central horizontal face and rolls the roller surface between seam.
The present invention further improves and is: when cogging and roughing, working modulus is 10%-20%; During middle finish rolling, working modulus is 5%-10%.
The present invention further improves and is: step 2), the temperature of rolling is 225 ℃ to 500 ℃.
The present invention further improves and is: step 2), the temperature of roll is 200～250 ℃ during rolling.
The present invention further improves and is: lubricating oil step 2) adopts No. 10 machine oil.
The magnesium alloy plate operation of rolling quantizes lubricating method, adopt the magnesium alloy plate operation of rolling described in any one in claim 1 to 8 to quantize lubricating method, in conjunction with rolling schedule, calculate the lubricating oil fuel delivery of all rolling passes and deposit computer in, computer is controlled oil mouth and lower oil nozzle according to the fuel delivery of calculated corresponding passage when rolling, after nipping, sheet material head starts at the uniform velocity fuel feeding, fuel cut-off when sheet material afterbody enters roll gap, until complete the whole operation of rolling.
With respect 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 that meets boundary lubrication needs; Also will determine the scaling loss amount of lubricant according to sheet material area, mill speed, interface temperature, consider, " quantification " is to surface spray-coating lubricant.In addition, also proposing lubricant particle will be attached to entrance side roll central horizontal face and be on the roll surface of 45 ° of angular range; For improving, nip and reduce scaling loss, to adopt the fuel supply method of in good time segmentation, sheet material head nip after fuel feeding, fuel cut-off when sheet material afterbody enters roll gap.The quantification lubricating method proposing according to the present invention is implemented lubricated, and rolling magnesium alloy plate, through macroscopic observation, rolls rear roll surface, plate face light, roll surface sticks phenomenon, meets lubrication needs, after measured, apply after lubricant rolling, plate surface roughness and roll surface approach, and plate surface roughness reduces.
During magnesium alloy rolling, rapid heat cycle reduces rolling performance, and except controlling 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 near roll surface entrance side roll central horizontal face conventionally, or be attached on roller board interface and plate face, lubricating oil quantity for spray often regulates with experience, easily cause the inhomogeneous and excessive scaling loss of roller plate surface cool, the present invention requires the lubricant particle of ejection to be attached to entrance side roll central horizontal face to be (see figure 1) on the roll surface of 45 ° of angular range, can to reduce like this lubricant in the roll surface time of staying, reduce oil consumption and roll surface temperature drop.In addition, the roll surface lower than plate surface temperature has pre-heat effect to lubricating oil, prevents plate face rapid heat cycle.
For the ease of nipping and preventing from unlubricatedly causing that metal sticks roll surface, when the materials such as rolling stainless steel, rolled piece starts fuel feeding before nipping, and rolls rear fuel cut-off (putting down into 6 years special permission communiques 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, sticks thing damage plate face.The present invention is according to magnesium plate rolling mill practice characteristic, for improving, nip and reduce scaling loss, adopt the fuel supply method of in good time segmentation, it is rolled piece tail end fuel cut-off while entering 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.This is different with the aforementioned method of putting down into described in 6 years special permission communiques 6-234989, before magnesium alloy workpiece front end is nipped and tail end enter after roll gap not fuel feeding, because its oxide-film is loose, after fuel feeding, easily come off, fuel cut-off is nipped and reduces oil consumption for improving.
[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 that adopts rolling under the inventive method and unlubricated state.
[specific embodiment]
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 physics, chemical characteristic, operation of rolling geometric parameter, Technological Parameters of Rolling Process, flow of lubricant change nature.Understand correlation and computational methods between relevant parameters.
Then according to lubrication theory and experiment, determine the computational methods that magnesium plate lubricant when the rolling quantizes, by the calculative determination unit interval, enter the lubricated merely required lubricant supply q of roll gap sheet material area.As asking the general expression of lubricant quantity delivered to represent by (1) formula:
q=f(ξ、H、h、B、S、V0、Vr、t、T、ε、Ra、λ) （1）
In formula: the thickness before H-plate rolling (mm); Thickness after h-plate rolling (mm); B-sheet material width (mm); V0-sheet material entrance velocity (mm/s); Vr-roll rotational speed (mm/s); ξ-oil film thickness (μ m); T-one-pass roller time (s); S-rolling header board face amasss (mm
2) T-rolling temperature (℃); Q-lubricants capacity (unit interval, unit are); λ-lengthening coefficient; ε-working modulus; Ra-roughness (μ m).
In order to calculate simple lubricated required lubricant supply q, the first suitable oil film thickness ξ of calculative determination plate surface.; During due to other materials such as aluminum, copper, steel, lubricant at roll surface, except lubricated, needs cooling control roll temperature with Fluid injection.But magnesium alloy carries out hot rolling or warm-rolling conventionally between 225 ℃ to 500 ℃, and deformation temperature is lower, temperature is controlled very strict, makes every effort to complete as early as possible at certain temperature range, fast at natural environment temperature drop, considers simple lubricated required lubricant supply therefore main.The calculating of oil film thickness is in the past the mechanism of deformed area that enters according to lubricant, and under the lubricated angle of wedge pressure-acting of entrance side, the oil film thickness that enters deformed area with fluid is determined computing formula, for magnesium alloy, is not suitable for.Here quote the rolling front and back oil film thickness relational expression of having considered lengthening coefficient:
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, from lubricant, enter the mechanism analysis of deformed area, magnesium alloy be take and realized rolling lubrication as object, only consider the simple lubricated oil mass needing, remove lubricated angle of wedge pressure-acting, lubricant enters the adsorbed film effect that deformed area mainly relies on the effect of carrying secretly, lubricant and the contact interface interaction generation of the uneven body of roller plate surface dimpling.According to lubricating status, when cogging and roughing, outlet side lubricating status is set as to mixed lubrication or filmlubrication, load is directly come in contact and bears by the partial hydrodynamic lubrication film and the micro-bulge that exist between friction in pairs surface.At this moment, ingot blank length is little, nips frequent, take attenuate as target, and drafts is large, extends large.For improving, nip, increase drafts, common pass reduction 10%-20%, roll surface roughness requires larger, can establish cogging and shaping roll surface roughness R
1for 1.6-6.5 μ m.
During middle finish rolling, outlet side lubricating status is set as to boundary lubrication, load is born by the generated boundary lubricant film that interacts between micro-bulge and lubricant and surface.This one-phase, plate, in attenuate, be considered dimensional accuracy, surface quality, working modulus is less, common pass reduction 5%-10%, roll surface roughness requires less, can establish middle planishing roll surface roughness R
1for 0.2-0.8 μ m.
During rolling, the magnesium alloy plate surface roughness that forms friction pair depends primarily on roll surface, and rolling generally adopts multi-pass, and each passage roller, plate roughness after cogging can think identical.Roller plate roughness according to rolling sequence to plate face quality requirement, can be in definite range regulation, general descending selection.Comprehensive roughmeter 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 comprehensive roughness value.
The oil film thickness ξ general formula definite according to lubricating status is:
ξ=K Ra(μ m) in 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, deformed area outlet oil film thickness ξ while setting cogging, roughing and middle finish rolling
1corresponding with mixed lubrication and borderline oil film thickness ξ respectively.Affected by the factors vary such as plate rolling stage, lubricating status, corresponding oil film thickness ξ
1capital changes, in other words ξ
1with rolling condition, change.
ξ in (4) formula is replaced by ξ
1, substitution (2) formula, arrange:
ξ
0=ξ
12λ/（λ+1）=KRa2λ/（λ+1） (5)
By repeatedly testing, observe the rear roll surface state that rolls, with stereomicroscope observation plate surface state, determine oil film thickness ξ
0as deformed area entrance, quantize oil film thickness calculated value.
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 while measuring rolling; Calculate lengthening coefficient λ, λ=H/h.
First the calculative determination rolling pass unit interval enters the area of sheet metal of roll gap, and 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)
According to (5) formula oil film thickness and (6) formula unit interval, enter the sheet material area formula of roll gap, draw the unit interval enter roll gap sheet material area merely the lubricated theory needing calculate oil mass q1:
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 lubricated under hot state, sheet material temperature is generally 250 ℃ of ° of-500 ℃ of scopes, and lubricating oil is heated can scaling loss.Scaling loss amount is calculated and can be designed a model by rolling temperature as variable, by experiment to modular form through repeatedly revising, the data that obtain are carried out to regression analysis; Also can directly obtain by experiment the relation curve of describing temperature and scaling loss amount, as shown in Figure 3, the scaling loss amount qT that represents No. 10 machine oil different temperatures in unit interval unit are, in conjunction with (6) formula S1=BVo, obtain under different temperatures, in the unit interval, enter the lubricants capacity q of roll gap sheet material area scaling loss
2, with following formula (8), represent:
q
2=BVoqT （8）
Determined to roll surface and supplied with simple lubricated oil mass q
1oil mass q with the scaling loss of being heated
2, just have the unit interval to be to the lubricants capacity of surface spray-coating:
q=q
1+q
2 （8）
In addition, the sheet material of certain length L, during with entrance velocity Vo rolling, the time by milling train equals the supply time of this passage, and time t represents by (9) formula:
t=L/Vo （9）
(5) formula to (9) formula is arranged, has definite 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 surfaces in time t.By rolling experiment, access panel surface macrostate, is multiplied by coefficient n to (10) formula and revises, and in practice, can meet lubricating requirement, and Amount of actual oil supply Q is:
Q=n2qt=n2t(q
1+q
2)=n2t BVo(ξ
0ρ+qT) （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, plate surface roughness, the little n value of drafts are limit 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 while measuring magnesium alloy plate rolling, roll surface roughness R
1, treat rolling magnesium alloy plate surface roughness R2;
2) by (5) formula, calculate entrance oil film thickness ξ
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 made as 1.6-6.5 μ m, middle finish rolling R
1be made as 0.2-0.8 μ m; 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 simple lubricated oil mass of (7) formula unit of account time;
Unit interval enters the sheet material area S of roll gap
1=BVo
Passage rolling time t=L/Vo
q
1=ξ
0S
1ρ==ξ
0BVoρ （7）
Wherein, ρ--lubricating oil density (g/cm
3)
4) by (8) formula, calculate lubricating oil scaling loss amount q
2:
q
2=BvoqT （8）
5) with (11) formula calculative determination rolling pass total fuel delivery to sheet material two surfaces in time t.
Q=n2qt=n2t(q
1+q
2)=n2t BVo(ξ
0ρ+qT) （11）
During due to rolled plate, be all multi-pass rolling conventionally, for the ease of the quantity delivered of grasp lubricant, guarantee to produce normal operation, can list calculating in the lump when basketry flow process.Aforementioned relevant fuel delivery calculating formula can be inputted computer, and combined process is formulated, convenient use.
6) while starting rolling, regulate nozzle, the lubricant particle of ejection is attached to entrance side roll central horizontal face and is on the roll surface of 45 ° of angular range (shown in Fig. 1); Want in good time segmentation fuel feeding, 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(㎜), 400 ℃ of rolling temperatures, 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, and all the other each parameters are selected and computing reference preceding method; During rolling, the temperature of roll is 200～250 ℃.No. 10 machine oil dopings for lubricating oil, proportion 0.9g/ ㎝
3, coefficient n selects 1, quantizes fuel feeding result of calculation in Table 1.
Magnesium alloy roughing lubricating oil quantizes to supply with rules table 1
Wherein, R
12refer to R
1=R
2=R
12, get the roughness of roll and calculate.
(note: during due to high temperature, with full oil lubrication meeting, burn, therefore more than 450 ℃ can adopt emulsion lubrication.）
Known AZ31 magnesium alloy finish rolling size of plate blank is 3000 * 600 * 6.0,350 ℃ of rolling temperatures, pass reduction 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, and all the other each parameters are selected and computing reference preceding method; During rolling, the temperature of roll is 200～250 ℃.No. 10 machine oil dopings for lubricant, proportion 0.9g/ ㎝
3, coefficient n selects 1, quantizes fuel feeding result of calculation in Table 2.
In magnesium alloy, roll lubricating oil and quantize to supply with rules table 2
Wherein, R
12refer to R
1=R
2=R
12, get the roughness of roll and calculate.
(note: during due to high temperature, with full oil lubrication meeting, burn, therefore more than 450 ℃ can adopt emulsion lubrication.）
The operation of rolling is implemented when lubricated, to regulate nozzle 2, the lubricant particle of ejection is attached to entrance side roll 1 central horizontal face be on the roll surface of 45 ° of angular range (see Fig. 1, wherein 1 is roll, the 2nd, and atomizer, the 3rd, magnesium alloy plate).The lubricant particle of nozzle 2 ejection is directly attached to roll central horizontal face and rolls the roller surface between seam, along with the rotation of roll is finally attached to magnesium alloy plate 3 surfaces.
The operation of rolling, adopts the fuel supply method of in good time segmentation, 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 after the invention process (finish rolling test): the quantification lubricating method proposing according to the present invention is implemented lubricated, rolling AZ31 magnesium alloy plate, through macroscopic observation, roll rear roll surface, plate face light, roll surface sticks phenomenon, meets lubrication needs.After unlubricated rolling, plate face is coarse, and has friction impression.After measured, apply after lubricant rolling, plate surface roughness and roll surface approach, and plate surface roughness reduces.After unlubricated rolling, plate surface roughness, 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 the rolling of N passage, entrance side thickness of slab H, the wide B of plate, the long L of plate, access panel speed Vo, the fast Vr of roller, outlet side thickness of slab h, roll surface roughness R while measuring magnesium alloy plate rolling
1with magnesium alloy plate surface roughness R
2; N is positive integer;
2), while starting the rolling of N passage, regulate upper and lower two nozzles to topping roll and bottom roll, at the uniform velocity to spray lubricating oil respectively; In rolling time t corresponding to N passage, two total fuel deliveries of nozzle are:
Q=n2t BVo(ξ
0ρ+qT) （11）
Wherein, n=0.8-1.2; ξ
0for entrance oil film thickness; ρ--lubricating oil density, g/cm
3; QT is the scaling loss amount in lubricating oil unit interval unit are, g/sm
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, and when cogging and roughing, R
1for 1.6-6.5 μ m, R during middle finish rolling
1for 0.2-0.8 μ m.
3. the magnesium alloy plate operation of rolling according to claim 1 quantizes lubricating method, it is characterized in that, and when cogging and roughing, 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 to topping roll and bottom roll respectively, 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, the lubricating oil particle of top nozzle ejection is attached to entrance side topping roll central horizontal face and is on the roll surface of 45 ° of angular range, and the lubricating oil particle of lower nozzle ejection is attached to entrance side bottom roll central horizontal face and is on the roll surface of 45 ° of angular range; And lubricating oil all sprays in corresponding roll central horizontal face and rolls the roller surface between seam.
6. the magnesium alloy plate operation of rolling quantizes lubricating method, it is characterized in that, adopt the magnesium alloy plate operation of rolling described in any one in claim 1 to 5 to quantize lubricating method, in conjunction with rolling schedule, calculate the lubricating oil fuel delivery of all rolling passes and deposit computer in, computer is controlled oil mouth and lower oil nozzle according to the fuel delivery of calculated corresponding passage when rolling, 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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| CN113134767A (en) * | 2021-04-28 | 2021-07-20 | 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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