CN101502850B - Method for controlling aluminium strip material periodic thickness difference - Google Patents

Abstract

The invention discloses a method for controlling periodic thickness difference in producing aluminum alloy strop, the control method comprises grinding a roller and implementing a pressure test on the ground roller; the roller grinding comprises: putting the roller upon a grinder on the basis of a bearing location for grinding to obtain the roller having accurate roller-type parameter and accurate basic circle run-out parameters; the pressure test for the ground roller comprises: mounting the roller on a rolling mill, measuring total rolling force deviation of the roller, judging fluctuation situation of the pressure at both sides of the roller: a, uniform pressure fluctuation at the both sides represents that the roller is qualified; b, non-uniform pressure fluctuation at the both sides represents checking the grinding parameters of the roller. The invention can accurately evaluate the condition of thickness distribution in the entire length direction of the aluminum strip and correctly judge the thickness of coil to control the quality.

Description

A kind of method for controlling aluminium strip material periodic thickness difference

Technical field

The present invention relates to a kind of method for controlling aluminium strip material periodic thickness difference.

Background technology

The aluminium user is more and more higher to the tolerance of aluminum alloy strip section product at present, is example with 3104 a systems jar material, and former tolerance is ± 0.008mm nowadays to require to reach ± 0.003mm, therefore to the corresponding raising of thick control permissible accuracy.The factor that influences the aluminium alloy strips product thickness is more, is precision and operation etc. as calibrator, blank quality, roller, and except that roller system, it is sporadic that all the other factors all belong to, and may cause indivedual coiled material thickness fluctuations, but can not form lot size problem.The thickness problem that causes of chance cause wherein, the overwhelming majority shows as in the band production process a certain length-specific section that is local thickness exceeds standard, can not involve whole coiled material, roller is the defective periodically thickness fluctuation that then can produce in whole band length range, and strip quality is had the greatest impact.Yet present thickness detecting method all depends on manually and measures, and the measured zone relative fixed that it is selected can only reflect that band is poor at certain same plate of a bit locating, lacks the assessment to the band integral thickness.At the milling train outlet side X ray thickness measurement online instrument is installed, because its operating position is fixed, can only measure by linear mode, and its sampling period is longer, it is very big influenced by mill speed, can not accurately reflect the thick difference control of band quality.

At present a lot of aluminium alloy strips manufacturers are owing to produce the cause recognition deficiency to thick difference, system research is not carried out in reason and the classification that thick difference is produced, all according to general THICKNESS CONTROL theory, rely on that calibrator is online to be controlled and detect, be aided with the manual detection means, when deviation appears in both measurement results again the penalty coefficient to calibrator adjust, and the thickness calibration plate that uses is tested, to obtain needed product thickness.Its weak point is that the service precision of calibrator must be very high and stable, and the frequency of adjusting penalty coefficient can increase; The grinding of breaker roll also only is confined to accurately control basic parameters such as roll original roller type and surface roughness, and to will cause that roll is beated and the basic circle of fitted position is beated, parameters such as bearing bit jitter and nip pressure do not do specification requirement, therefore the control to periodic thickness difference cuts any ice hardly, can not reach the purpose of the thick difference of accurate control cycle.

Existing roll dressing mode is unfavorable for accurately controlling roll profile, basic circle parameter such as beat.When thickness of strip is detected, fail to consider periodic thickness difference fluctuation, thereby the parameter can not accurately instruct roll dressing the time changes, and then can not reach the purpose of accurate reflection and the thick difference of control cycle.

Summary of the invention

The purpose of this invention is to provide a kind of method for controlling aluminium strip material periodic thickness difference, accurately control roll profile, basic circle parameter such as beat, reach the purpose of accurate reflection and the thick difference of control cycle.

For solving the problems of the technologies described above, technical scheme provided by the present invention is: a kind of method for controlling aluminium strip material periodic thickness difference, this control method comprise roll dressing and the roll of grinding are carried out pressure test;

Described roll dressing is: is that benchmark props up in grinding machine and carries out grinding with roll with the bearing position, obtains the roll shape parameter and the roll of basic circle jitter parameter accurately accurately;

Described roll to grinding carries out pressure test: roll is installed milling train, measure the general rolling force deviation of roll, judge the fluctuation situation of roll pressure at both sides:

A, pressure at both sides fluctuation evenly show that roll is qualified;

B, pressure at both sides fluctuate inhomogeneous, and the grinding parameter of breaker roll carries out verification.

This control method also comprises the test standard specimen: adopt qualified roll, the obtain a plurality of standard specimens of a roll in the cycle are measured on the finished product band, obtain the thickness distribution situation of band on whole length direction, judge the grinding quality of roll.

Described roll dressing may further comprise the steps:

(1) preparation: more finish changing the required roughness of grinding roller and steadily after emery wheel, be ready to the required special use holder of grinding roller watt;

(2) roll is winched on the grinding machine, the roll central aperture head of a bed is top, stationary roll;

(3) adopt

400～500mm outside micrometer is measured roller diameter, measures the roll tapering, and the low speed rotation roll is measured the roll bus, the correction body of roll;

(4) adopt 4# curve breaker roll to carry out the roll shape corase grind, carry out tapering then and detect, finish grind after qualified;

(5) the bearing bit jitter is not satisfied the roll of≤3 μ m, need carry out reconditioning the bearing position;

(6) select for use the place, emery wheel elder generation breaker roll location between 80～120# granularity to carry out reconditioning, reconditioning is carried out in the bearing position after reaching requirement, until bearing bit jitter≤3 μ m;

(7) reconditioning bearing inner sleeve, the roughness Ra that guarantees bearing position and interior cover is between 0.30～0.40 μ m.

Described nip pressure test may further comprise the steps:

(1) roll after good is installed milling train with grinding;

(2) set roll-force 250t, main frame rotary speed 100m/min;

(3) under the 250t draught pressure, keep 4～5min, measure pressure, general rolling force, main frame speed and the roll-force deviation of roll transmission side, fore side;

(4) when the general rolling force deviation of measuring be positioned at ± during the error of 5～6t, judge that promptly the fluctuation of roll pressure at both sides is even, roll is qualified;

(5) when the measurement result deviation be positioned at ± error of 5～6t outside the time, grinding parameter that must breaker roll carries out verification.

The method of described standard specimen test is:

When (1) the mill product coiled material is to afterbody, reduce mill speed rapidly, utilize milling train inlet scissors that band is cut off to stopping;

(2) under the coiled material behind the machine, divest outer ring thickness fluctuation section, divest the about 100～120m of length;

(3) along the strip-rolling direction a roll cycle, be 1.2～1.8m, vertically get three full-page proofs by transmission side, fore side and middle part;

(4) be that 75～80mm cut into 30 * 30mm sample with full-page proof by spacing distance with scissors, and numbering, guarantee that every full-page proof measurement data has 15～20;

(5) adopt the micrometer of the special measurement thickness of making to measure every sample one by one, and carry out vertical and corresponding lateral comparison;

(6) if the deviation of all measurement data in critical field, can obtain the thickness distribution of band on whole length direction, can judge the grinding quality of roll thus.

The advantage that the present invention has: (1) can accurately estimate the thickness distribution situation on the whole length direction of aluminium, correctly judges coiled material THICKNESS CONTROL quality; Whether qualified, it is proper whether grinding parameter is controlled if (2) can accurately estimate the roll dressing quality; (3) can in time adjust improvement according to testing result breaker roll grinding parameter, optimize grinding process; (4) can obtain the higher product of thick poor precision by improving the roll dressing precision; (5) can stop the batch nature amount accident that causes because of thick poor reason to greatest extent; (6) can set up standardized roll dressing process modeling, set up the roller parameter database, be convenient to analyze and management.

The specific embodiment:

Below in conjunction with specific embodiment the present invention is described in further detail, but content of the present invention be not limited to for embodiment.

A kind of method for controlling aluminium strip material periodic thickness difference, this control method comprises roll dressing, and the roll of grinding is carried out pressure test, and the standard specimen test:

A, roll dressing control method and flow process:

1, preparation: more finish changing the required roughness of grinding roller and steadily after emery wheel, be ready to the required special use holder of grinding roller watt;

2, roll is winched on the grinding machine, the roll central aperture head of a bed is top, stationary roll;

3, adopt φ 400-500mm outside micrometer to measure roller diameter, measure the roll tapering, and the low speed rotation roll is measured the roll bus, the correction body of roll;

4, adopt 4# curve breaker roll to carry out the roll shape corase grind, carry out tapering then and detect, finish grind after qualified;

5, the bearing bit jitter is not satisfied the roll of specification requirement (≤3 μ m), need reconditioning is carried out in the bearing position;

6, select for use the place, emery wheel elder generation breaker roll location between the 80-120# granularity to carry out reconditioning, reconditioning is carried out in the bearing position after reaching requirement, until bearing bit jitter≤3 μ m;

7, reconditioning bearing inner sleeve, the roughness Ra that guarantees bearing position and interior cover is between 0.30-0.40 μ m;

8, meet control and require after, finish roll dressing, on the roll dressing minute book, perform record.

Measure pressure at both sides difference flow process behind B, the replacing backing roll:

1, the roll after good is installed milling train with grinding;

2, in the order of operating room input hot-rolling, set roll-force 250t, main frame rotary speed 100m/min;

3, under the 250t draught pressure, keep 4-5min, measure pressure, general rolling force, main frame speed and the roll-force deviation of roll transmission side, fore side;

4, when the general rolling force deviation of measuring≤± during 5-6t, promptly judge the fluctuation of roll pressure at both sides evenly, roll is qualified;

5, when the measurement result deviation is big, grinding parameter that must breaker roll carries out verification.

The method of C, standard specimen test:

When 1, the mill product coiled material is to afterbody, reduce mill speed rapidly, utilize milling train inlet scissors that band is cut off to stopping;

2, under the coiled material behind the machine, divest outer ring thickness fluctuation section, generally divest the about 100-120m of length;

3, along the strip-rolling direction in a roll cycle (being generally about 1.5m), vertically get three full-page proofs by transmission side, fore side and middle part;

4, be that 75-80mm cut into 30 * 30mm sample with full-page proof by spacing distance with scissors, and numbering, guarantee that every full-page proof measurement data has 15-20;

5, adopt the micrometer of the special measurement thickness of making to measure every sample one by one, and carry out vertical and corresponding lateral comparison;

6, get rid of other and may cause the reason of thick difference fluctuation,, can judge the grinding quality of roll thus if the deviation of all measurement data in critical field, can obtain the thickness distribution of band on whole length direction as supplied materials, calibrator etc.

The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.

Claims (5)

1. method for controlling aluminium strip material periodic thickness difference, this control method comprise roll dressing and the roll of grinding are carried out pressure test;

Described roll dressing is: is that benchmark props up in grinding machine and carries out grinding with roll with the bearing position, obtains the roll shape parameter and the roll of basic circle jitter parameter accurately accurately;

Described roll to grinding carries out pressure test: roll is installed milling train, measure the general rolling force deviation of roll, judge the fluctuation situation of roll pressure at both sides:

A, pressure at both sides fluctuation evenly show that roll is qualified;

B, pressure at both sides fluctuate inhomogeneous, and the grinding parameter of breaker roll carries out verification.

2. method for controlling aluminium strip material periodic thickness difference according to claim 1, it is characterized in that: this control method also comprises the test standard specimen: adopt qualified roll, the obtain a plurality of standard specimens of a roll in the cycle are measured on the finished product band, obtain the thickness distribution situation of band on whole length direction, judge the grinding quality of roll.

3. method for controlling aluminium strip material periodic thickness difference according to claim 1 is characterized in that: described roll dressing may further comprise the steps:

(1) preparation: more finish changing the required roughness of grinding roller and steadily after emery wheel, be ready to the required special use holder of grinding roller watt;

(2) roll is winched on the grinding machine, the roll central aperture head of a bed is top, stationary roll;

(3) adopt

400～500mm outside micrometer is measured roller diameter, measures the roll tapering, and the low speed rotation roll is measured the roll bus, the correction body of roll;

(4) adopt 4# curve breaker roll to carry out the roll shape corase grind, carry out tapering then and detect, finish grind after qualified;

(5) the bearing bit jitter is not satisfied the roll of≤3 μ m, need carry out reconditioning the bearing position;

(6) select for use the place, emery wheel elder generation breaker roll location between 80～120# granularity to carry out reconditioning, reconditioning is carried out in the bearing position after reaching requirement, until bearing bit jitter≤3 μ m;

(7) reconditioning bearing inner sleeve, the roughness Ra that guarantees bearing position and interior cover is between 0.30～0.40 μ m.

4. method for controlling aluminium strip material periodic thickness difference according to claim 2 is characterized in that: described nip pressure test may further comprise the steps:

(1) roll after good is installed milling train with grinding;

(2) set roll-force 250t, main frame rotary speed 100m/min;

(3) under the 250t draught pressure, keep 4～5min, measure pressure, general rolling force, main frame speed and the roll-force deviation of roll transmission side, fore side;

(4) when the general rolling force deviation of measuring be positioned at ± during the error of 5～6t, judge that promptly the fluctuation of roll pressure at both sides is even, roll is qualified;

(5) when the measurement result deviation be positioned at ± error of 5～6t outside the time, grinding parameter that must breaker roll carries out verification.

5. method for controlling aluminium strip material periodic thickness difference according to claim 2 is characterized in that: the method for described standard specimen test is:

When (1) the mill product coiled material is to afterbody, reduce mill speed rapidly, utilize milling train inlet scissors that band is cut off to stopping;

(2) under the coiled material behind the machine, divest outer ring thickness fluctuation section, divest the about 100～120m of length;

(3) along the strip-rolling direction a roll cycle, be 1.2～1.8m, vertically get three full-page proofs by transmission side, fore side and middle part;

(4) be that 75～80mm cut into 30 * 30mm sample with full-page proof by spacing distance with scissors, and numbering, guarantee that every full-page proof measurement data has 15～20;

(5) adopt the micrometer of the special measurement thickness of making to measure every sample one by one, and carry out vertical and corresponding lateral comparison;

(6) if the deviation of all measurement data in critical field, can obtain the thickness distribution of band on whole length direction, can judge the grinding quality of roll thus.