CN214767788U

CN214767788U - Structure for forming cladding arc on working roll by metal strip foil

Info

Publication number: CN214767788U
Application number: CN202120782354.1U
Authority: CN
Inventors: 刘洪勤; 马力; 徐继玲; 李毅
Original assignee: Shanghai Wuxing Copper Co ltd
Current assignee: Shanghai Wuxing Copper Co ltd
Priority date: 2021-04-16
Filing date: 2021-04-16
Publication date: 2021-11-19
Anticipated expiration: 2031-04-16

Abstract

A structure for realizing the formation of a coating arc of a metal strip foil on a working roll comprises a rolling mill, a front adjusting roll and a rear adjusting roll, wherein the metal strip foil is coated on the roll surface of the same or different working rolls to form the coating arc by adjusting the height of the front adjusting roll or the rear adjusting roll. The back support of the working roll to the strip foil enables the front tension to be uniformly distributed on the cross section of the wrapping arc at the inlet side, uniform rolling of the strip foil is achieved, the bottleneck of restricting the strip foil to develop in the direction of wider, thinner and more ideal plate shape is broken through, and the technical problem in the industry is solved. The utility model discloses still make the tape foil form the cladding arc on the roll surface of working roll at the outlet side of roll gap, realized the evenly distributed of back tension on outlet side cladding arc, just eliminated the production of defects such as wave, fold at the rolling shaping initial stage of tape foil to obtain the plate-type of preferred. The utility model discloses there is the effect of extrusion attenuate promptly, has again to rub the effect of rolling the attenuate with the hands, more is of value to the control of plate-type.

Description

Structure for forming cladding arc on working roll by metal strip foil

Technical Field

The utility model belongs to the technical field of the rolling technique and specifically relates to a structure for realizing that metal band paper tinsel forms the cladding arc on the working roll to the realization is to the rolling of all opening of metal strip, foil, thereby obtains good plate-type.

Background

With the advance of the scientific and technological industry, the market demand for high-precision wide-width thin strips and foils (hereinafter referred to as "strips and foils") is more and more urgent. In the current technical background, the rolling technology of wide and thick strips is basically mature, but still faces a lot of technical obstacles in the rolling technology of high-precision wide-width strip foils. For thicker strips, even if the strip shape defects exist after rolling, the strip shape can still be finished and corrected by straightening or other flattening means, and for strip foils, particularly foils with extremely small thickness, the strip foils can only be controlled by rolling due to the lack of subsequent strip shape correction means. Particularly, for a strip foil with large deformation resistance such as copper, copper alloy, stainless steel and the like, stable production is difficult to realize due to the restriction of the plate shape control capability. According to known information, the minimum rolling thickness of 0.006mm and the maximum width of 650mm can be achieved by mass production of pure copper foil, the minimum rolling thickness of 0.02mm and the maximum width of 600mm can be achieved by mass production of stainless steel foil, the rolled plate shape is not good, and if the width is increased continuously, the plate shape becomes worse.

The three basic conditions for stable rolling of the rolling mill are the roller system precision, the lubrication condition and the tension precision respectively. For rolling of an extremely thin strip foil, the reduction effect of the reduction amount is weakened, and the thickness reduction of the strip foil is realized by basically depending on the flattening rebound amount, the rolling speed and the larger unit tension of the working roll. The tension selected for the rolling of thicker strip material is typically no more than 16% of the yield strength of the strip material, so that the tension is not significant in the thinning of the strip material, the main effect of which is to establish a stable rolling regime. The rolling of the band foil with extremely thin thickness has great difference, and in order to fully utilize the thinning effect of the tension on the band foil, the unit tension is adopted to even reach 60 percent of the yield strength of the material. Since a large tension has a large effect on the thinning of the strip foil and naturally also on the rolled plate shape, the effect of the tension on the plate shape is mainly manifested as the uniformity of the distribution of the tension over the cross section of the strip foil.

As shown in fig. 1, the tension per unit width is ideally uniform and uniform in the cross section of the tape foil (including the side portions), but this is not the case in actual production. The actual tension distribution is shown in fig. 2, in which the distribution of the tension on the cross section of the strip foil is not uniform, the tension values at the two edges of the strip foil are the maximum, the tension value at the middle part is smaller, Δ T in the figure is the difference between the maximum and the minimum of the distribution of the tension along the width B of the strip foil, and the ratio Δ T/B can be referred to as the tension non-uniformity. There are many factors that cause tension non-uniformity in the cross-section of the tape foil, one from material composition, texture and annealing non-uniformity, which are random; another type of factor comes from rolling conditions, which are regularly found, such as the phenomenon of sudden edge thickness reduction of the strip foil during multiple ironing, which is described in the paper "three-dimensional analysis of cold-rolled strip deformation", which uses finite element method simulation to calculate the plate roll-off and cross-flow as a function of the strip edge distance, see steel rolling, third 1999. According to the roll pressure formula:

it is known that the fluctuations in zone thickness are accompanied by a lateral flow of the metal material (macroscopically manifested as a plate-shaped anomaly), which leads to fluctuations in the rolling force P1 in the zone, and fluctuations in the rolling force P1 lead to fluctuations in the tension S1 in the zone. The tension S1 fluctuation in the area, in turn, leads to fluctuation in the rolling force P1, and fluctuation in the rolling force P1 affects the lateral flow of the metal material, which is causal. This means that the tension applied to the cross-section of the strip foil during rolling is not uniform and that this tension non-uniformity is common。

In the rolling process, the influence of front tension and rear tension on the strip shape is greatly influenced, and is recorded in a paper ' influence of tension on deformation of a cold-rolled strip ', and the paper discusses in detail through a three-dimensional simulation system that the transverse flow of metal is limited by increasing front and rear tension, so that the thickness deformation of the strip can be increased, the section thickness is more uniform, and the influence is detailed in the fourth stage of 35 volumes of steel '. Whereas for a strip foil increasing the front and back tension has a greater influence on the shape of the strip foil. The tension of the strip foil is not uniform in unit width, the deformation resistance, the roll gap and the material thickness of local rolling are not uniform, and finally, the rolled plate shape has defects (including potential defects), such as waves and wrinkles which often occur in the rolling process. More seriously, the severe tension changes in the two edge regions cause the foil to split at both edges and, once the split occurs, it rapidly stretches laterally, thereby causing the foil to break. The wider the strip foil is, the greater the tension unevenness is, the more difficult the strip shape is to control, which is a bottleneck restricting the strip foil to develop towards a wider, thinner and more ideal strip shape at present, and is also a technical problem difficult to solve in the industry for a long time, and how to make the tension uniformly distributed on the cross section of the strip foil is a key for solving the problem.

As shown in FIG. 3, the arrangement is a typical arrangement mode of the current foil rolling, and the foil 5 horizontally enters a roll gap along a rolling center line 6 after passing through a lifting roll 4 and a flattening roll 3 and is stretched in advance at home or abroad. As can be seen from fig. 3, before the band foil 5 enters the roll gap, the band foil located between the lower working roll 2 and the spreader roll 3 is always in a suspended and tightened state, so that the problem of uneven distribution of tension on the cross section of the band foil is solved, and the success or failure of the high-precision wide-width band foil rolling is directly influenced.

SUMMERY OF THE UTILITY MODEL

In order to overcome not enough in the background art, the utility model discloses a structure for realizing that metal band paper tinsel forms cladding arc on the working roll, its aim at: the tension is uniformly distributed on the cross section of the strip foil, and the metal strip foil is rolled uniformly.

In order to realize the purpose, the following technical scheme is adopted:

a structure for forming a clad arc on a working roll by a metal strip foil comprises a rolling mill, a front adjusting roll arranged at the inlet side of a roll gap of the rolling mill and a rear adjusting roll arranged at the outlet side of the roll gap of the rolling mill.

As an independent technical scheme, the metal strip foil is coated on the roller surface of a certain working roller by adjusting the height of a front adjusting roller or a rear adjusting roller of the machine to form a coating arc.

As another independent technical scheme, the heights of the front adjusting roller and the rear adjusting roller of the machine are adjusted, so that the metal strip foil is coated on the roller surfaces of the same or different working rollers to form an inlet side coating arc and an outlet side coating arc.

As a preferable technical scheme of the scheme 1, the wrapping angle of the wrapping arc is alpha, and alpha is more than 0 degree and less than or equal to 90 degrees.

In a preferred embodiment of

claim

1 or 2, the pre-finishing roll and the post-finishing roll are formed of any one of a nip roll, an oil-squeezing roll, an S-roll, and a high-low roll, or a combination thereof.

As a preferable technical means of the means 2, the inlet side coating arc and the outlet side coating arc are coated on the roll surfaces of different work rolls, and the coating angle of the inlet side coating arc of the roll gap is equal to the coating angle of the outlet side coating arc of the roll gap.

As a preferable mode of the mode 2, the entry-side coating arc and the exit-side coating arc are coated on the roll surface of the same work roll, and the coating angle of the roll gap entry-side coating arc is equal to the coating angle of the roll gap exit-side coating arc.

As a preferable mode of the mode 2, the roll surface linear velocity of the work roll on which the entrance-side cover arc is located is larger than the roll surface linear velocity of the work roll on which the exit-side cover arc is located.

As a preferable mode of the mode 2, the roll diameter of the work roll on which the entry-side cover arc is located is larger than the roll diameter of the work roll on which the exit-side cover arc is located.

Owing to adopt above-mentioned technical scheme, compare the background art, the utility model discloses following beneficial effect has:

according to embodiment 1, the utility model discloses at the entrance side of roll gap, make the area paper tinsel form the cladding arc on the work roll, prop through the back of work roll to the area paper tinsel, make preceding tension evenly distributed on the cross section of entrance side cladding arc, realized all opening rolling to the area paper tinsel, broken through the bottleneck that restriction area paper tinsel is to wideer, thinner, more ideal plate-type orientation goes up the development, solved the long-term difficult technical problem who is difficult to solve in the trade, consequently have great using value and economic value.

According to embodiment 2, the utility model discloses at the outlet side of roll gap, make and take the paper tinsel to form the cladding arc on the roll surface of work roll, realized the evenly distributed of back tension on outlet side cladding arc, just eliminated the production of defects such as wave, fold at the rolling key shaping initial stage of taking the paper tinsel, then rethread work roll is to the back-up support of taking the paper tinsel, makes the plate shape of taking the paper tinsel can be stable in roll forming's later stage to obtain the plate shape of preferred.

It can be seen from embodiment 3 and embodiment 4 that the present invention integrates the uniform action of the inlet-side clad arc and the outlet-side clad arc, and not only solves the problem of curling deformation of the tape foil, but also solves the problem of different bright surfaces of the tape foil on the basis of the advantageous effects of embodiment 1 and embodiment 2.

It is especially important, the utility model discloses a attenuate that slides has the effect of extrusion attenuate promptly, has the effect of rolling the attenuate again with the hands, makes the middle level position of neutral face stable in the area paper tinsel moreover to the homogeneity of area paper tinsel mechanical properties has been guaranteed.

Drawings

Fig. 1 is a schematic view of the tension distribution applied in an ideal state on a cross section of a strip foil.

Fig. 2 is a schematic view of the tension distribution actually applied to the cross section of the strip foil.

Fig. 3 shows a typical arrangement of current foil rolling.

Fig. 4 is a schematic structural view of the present invention in embodiment 1.

Fig. 5 is a schematic view of a belt drive.

FIG. 6 is a force analysis graph of a volume element on a clad arc.

FIG. 7 is a force analysis plot of a volume of cells with foil in an unsupported state.

Fig. 8 is a force analysis diagram of a volume unit with the foil in the backed state.

FIG. 9 is a tension distribution diagram in the thickness direction of a certain volume unit on the arc of the entry side cladding of the roll gap in example 1.

FIG. 10 is a graph of the flow velocity profile of the upper and lower layers of tape foil in the calendering zone.

Fig. 11 is a schematic structural view of the present invention in embodiment 2.

FIG. 12 is a tension distribution diagram in the thickness direction of a certain volume unit on the exit side of the roll gap in the coating arc of example 2.

Fig. 13 is a schematic structural view of the present invention in embodiment 3.

FIG. 14 is a tension distribution diagram in the thickness direction of a certain volume unit on the exit side of the roll gap in the coating arc of example 3.

Fig. 15 is a schematic view of conventional squeeze ironing.

FIG. 16 is a schematic diagram of slip thinning.

Fig. 17 is a schematic structural view of the present invention in embodiment 4.

In the figure: 1. an upper work roll; 2. a lower working roll; 3. flattening rollers; 4. a lifting roller; 5. a tape foil; 6. rolling a central line; 7. a driving pulley; 8. a belt; 9. a volume unit.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. It should be noted that in the description of the present invention, the terms "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate directions or positional relationships based on those shown in the drawings, which are merely for convenience of description, but do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Example 1:

a structure for realizing the formation of a cladding arc of a metal strip foil on a working roll comprises a rolling mill and a flattening roll 3 arranged at the inlet side of a roll gap of the rolling mill, wherein the strip foil 5 is clad on the roll surface of a lower working roll 2 by adjusting the height of the flattening roll 3 to form the inlet side cladding arc.

Specifically, as shown in fig. 4, a flattening roll 3 is provided on the entrance side of the roll gap, the roll surface of the flattening roll 3 is lower than the rolling center line 6, and the strip foil 5 is stretched before passing through the flattening roll 3 and then obliquely upward into the roll gap formed by the pair of work rolls. Because the strip foil 5 forms a certain included angle with the rolling central line 6 before entering the roll gap, the strip foil 5 forms an inlet side coating arc on the roll surface of the lower working roll 2, and the coating angle of the inlet side coating arc is alpha, and alpha is 30 degrees. Due to the existence of the inlet-side coating arc, the lower working roll 2 backs up the strip foil 5, and the tension is uniformly distributed on the cross section of the inlet-side coating arc, and the principle is as follows:

as shown in fig. 5, in the transmission of the belt 8, the driving pulley 7 drives the belt 8 to rotate clockwise, point a is an entry point of the belt 8 into the driving pulley 7, and point B is an exit point of the belt 8 from the driving pulley 7. The frictional force generated by the driving pulley 7 on the belt 8 is cumulatively increased in the entrance-side coating arc from the point a to the point B, so that the tension F2 of the belt 8 at the point B is smaller than the tension F1 thereof at the point a, and the larger the coating angle of the entrance-side coating arc, the larger the difference between F1 and F2 is, which results in that the belt 8 at the point B side is always in a slack state and the belt 8 at the point a side is always in a tensioned state.

For the same reason, as shown in fig. 6, during rolling, the strip foil 5 enters the roll gap from the left side, the neutral point P is in the rolling arc, and the linear velocity of the work roll surface is greater than the linear velocity of the strip foil 5 entering the roll gap on the left side of the neutral point P, which generates a velocity difference and a friction force F3, i.e., the lower work roll 2 rotates the strip foil 5 along the inlet-side wrapping arc, as the belt 8 drives. In the figure, a volume element 9 is arbitrarily taken on the inlet side coating arc, and due to the friction force F3, the tension F2 acting on the volume element 9 is smaller than the tension F1 acting on the far end of the volume element, wherein the near end tension and the far end tension are expressed relative to the distance from the roll gap. For the next volume element 9 to the right of this volume element 9, the magnitude of the distal tension acting on this volume element 9 is equal to F2, the magnitude of the proximal tension is smaller than F2, and so on, due to the cumulative increase in friction F3. It follows that the friction force F3 increases cumulatively from point a (the start of the entry-side cladding arc) to point B (the end of the entry-side cladding arc), and correspondingly the proximal tension F2 experienced by the tape foil 5 on the volume element 9 decreases progressively from point a to point B.

As shown in fig. 7, in the figure, one volume element 9 is provided on the tape foil 5, and due to the non-uniformity of the tension, the tension of the two side portions of the volume element 9C, D is greater than that of the middle E portion, and the E portion bulges to form a wave. In the case of suspended tensioning of the band foil 5, the proximal tension F2 is equal to the distal tension F1, at which the volume elements 9 are contracted inward in the width direction, the internal force F4 of which is negative.

As shown in fig. 8, when the volume unit 9 enters the inlet-side cladding arc, the lower work roll 2 applies a back-supporting force T thereto, so that the volume unit 9 is bent and deformed. As the proximal tension F2 gradually decreases, the internal force F4 acting in the width direction of the volume element 9 changes from negative to positive and gradually increases. The increase of the internal force F4 causes the volume elements 9 to spread outward in the width direction as if the loose rubber band widened in the width direction, thereby flattening the corrugated portion of the belt foil 5. In the flattening process, the near-end tension acting on two side parts of the volume unit 9C, D is rapidly reduced, two side parts of C, D extend outwards along the width direction, so that the middle part E is in contact with the roller surface of the lower working roller 2, and after the part E is in contact with the lower working roller 2, the near-end tension of the middle part of the volume unit 9 is correspondingly increased, and further the uniform distribution of the near-end tension F2 on the cross section of the volume unit 9 is realized. As can be seen from fig. 6, the proximal tension F2 in the roll gap rolling zone is the front tension of the rolling, where the front tension is the smallest and the front tension is the most uniform in the cross section. It can also be seen that the larger the wrap angle of the inlet side wrap arc, the smaller the front tension in the nip rolling zone, and the more evenly the front tension is distributed.

In rolling, the large front tension facilitates the control of the strip shape, and the presence of the inlet-side wrapping arc, while making the front tension uniformly distributed over the cross section of the strip foil 5, loses part of the front tension, thus requiring the coiler or the flattening roll 3 to add an appropriate front tension to the strip foil 5 to compensate for the loss. The tension of the leading end of the inlet side coating arc can be increased to 50-60% of the yield strength of the material during rolling, and the thin strip foil 5 is pulled by fully utilizing the thinning effect of the tension on the strip foil 5. For rolling of the strip foil 5, which is basically seamless rolling, the rolling process of the strip foil 5 by the working rolls can be regarded as a repeated thinning and widening process of the strip foil 5, and the coiling machine and the flattening roll 3 can be regarded as a repeated elongated narrowing process of the strip foil 5, so that the appropriate increase of the front tension of the strip foil 5 is more beneficial to the thinning and the shape control of the strip foil 5.

It should be noted that the proximal tension F2 varies in a gradient in the thickness direction, as shown in fig. 9, the side of the entrance-side clad arc in contact with the lower work roll 2 has a low tension and the side of the entrance-side clad arc away from the lower work roll 2 has a high tension, which compensates for the loss of the front tension to some extent, and the compensation effect is more significant especially for thicker strip materials.

As shown in fig. 10, when the strip foil 5 enters the rolling area of the nip, the strip foil 5 starts to deform due to the extrusion of the work rolls, the deformation amount of the upper layer of the strip foil 5 is greater than that of the lower layer due to the existence of the entrance-side clad arc, the linear velocity of the mass point of the upper layer at the neutral point P is consistent with that of the roll surface of the upper work roll 1, while the plate surface of the lower layer lags behind, the linear velocity of the mass point at the point E is consistent with that of the roll surface of the lower work roll 2, so that the outflow velocity of the upper layer of the strip foil 5 is greater than that of the lower layer of the strip foil 5, and the strip foil 5 curls towards one side of the lower work roll 2, which indicates that there is a layer shift phenomenon in the rolling area. The layer shift phenomenon deflects the neutral surface of the band foil 5 toward the lower layer, and causes the band foil 5 to be deformed by curling. The curling deformation is obvious on the strip with larger plate thickness, but is not obvious on the strip with the thickness less than 0.5mm and the foil, and can be corrected through the subsequent procedures of flattening, straightening and the like. For the strip with larger plate thickness, the elimination of the phenomenon of the layer shift can be solved by increasing the roll diameter of the lower working roll 2, and the proper increase of the roll diameter of the lower working roll 2 can improve the linear velocity of the lower plate surface mass point at the point E and eliminate the neutral plane shift caused by the hysteresis and the layer shift phenomenon. However, this method is difficult to be achieved in actual production, the linear velocity is increased by several times (0.01 mm for 1 pass) of increasing the roll diameter of the lower working roll 2, and the linear velocity is constantly changed, so that it is difficult to control.

The deviation of the neutral plane causes the mechanical properties of the strip foil to be uneven, and it is known from the background art that it is difficult to achieve the stability of the neutral plane in actual production, and since it is difficult, it is not necessary to specify the way the strip foil enters the roll gap according to the national standard. For some application fields, the requirement for the mechanical property of the tape foil is not high, such as the use of copper tape foil for conduction, or for decoration, corrosion prevention, etc., and it is not necessary to have too high requirement for the uniformity of the mechanical property of the tape foil at all. Therefore, in the present invention, the strip foil 5 does not enter the roll gap horizontally along the rolling center line 6, and itself has broken the recognition in the industry, and thus is inventive.

According to embodiment 1, the utility model discloses at the entrance side of roll gap, make and take paper tinsel 5 to form entrance side cladding arc on lower work roll 2, through lower work roll 2 to the back-support of taking paper tinsel 5, make tension evenly distributed on the cross section of entrance side cladding arc, realized taking paper tinsel 5's rolling of all opening, broken through restriction taking paper tinsel 5 to wideer, thinner, the more ideal plate shape orientation in the bottleneck of developing, solved the long-term difficult technical problem who solves in the trade, consequently, great using value and economic value have.

It should be noted that forming the strip foil 5 into an entry-side wrap arc on the lower work roll 2 is not limited to the flattening roll 3, but includes all pre-machine adjustment rolls, such as an S-roll, a high-low roll, or a combination thereof. The strip foil 5 can form an inlet side coating arc on the lower working roll 2 only by adjusting a front adjusting roll closest to the roll gap to form a certain included angle between the strip foil 5 and the rolling central line 6 before entering the roll gap. In the present embodiment, the inlet-side coating arc is formed on the lower work roll 2, and the inlet-side coating arc may be formed on the upper work roll 1 by the same principle.

Example 2:

a structure for realizing the metal strip foil to form a coating arc on a working roll comprises a rolling mill and a flattening roll 3 arranged at the outlet side of a roll gap of the rolling mill, wherein the strip foil 5 is coated on the roll surface of an upper working roll 1 by adjusting the height of the flattening roll 3 to form the outlet side coating arc.

Specifically, as shown in fig. 11, in the present embodiment, the band foil 5 enters the roll gap horizontally along the rolling center line 6, the flattening rolls 3 are provided on the exit side of the roll gap, and the roll surfaces of the flattening rolls 3 are higher than the rolling center line 6. The flattening roll 3 post-tensions the strip foil 5 so that the strip foil 5 forms an exit-side wrap arc on the roll surface of the upper work roll 1, and the wrap angle of the exit-side wrap arc is β, which is also 30 °. Due to the existence of the outlet-side coating arc, the upper working roll 1 backs up the strip foil 5, and the tension is uniformly distributed on the cross section of the outlet-side coating arc, and the principle is as follows:

as shown in fig. 12, the band foil 5 flowing out from the nip is wrapped around the upper work roll 1 to form an exit-side wrapping arc. Since the linear velocity V of the outgoing tape foil 5 is greater than the linear velocity of the roll surface of the upper work roll 1, the upper work roll 1 generates a reverse frictional force F4 to any volume element 9 on the exit side wrapping arc, and a proximal tension F5 and a distal tension F6 are applied to the volume element 9. As described in example 1, the frictional force F4 increases gradually from point M to point N, and likewise, the distal tension F6 increases accordingly. The distal tension F6 reaches a maximum at point N, where the distal tension F6 is the posterior tension. The post-tension can not only prevent the deviation of the strip foil 5, but also reduce the rolling pressure, and is beneficial to the high-speed rolling of the strip foil 5. Because the linear speed of the outgoing line of the band foil 5 is greater than that of the roll surface of the working roll when the band foil 5 flows out of the roll gap, the band foil 5 can be understood as a belt, the upper working roll 1 is understood as a driven pulley, then, the band foil 5 drives the upper working roll 1 to rotate, if the belt drives the driven pulley to rotate, the larger the wrapping arc at the outlet side is, the larger the transmission torque is, so that the torque of the upper working roll 1 is reduced, and the energy consumption of a main motor is reduced.

It is particularly important that the strip foil 5 is subjected to a gradually increasing back tension after it has exited the nip, which, based on the mechanism in example 1, is the smallest at the exit of the nip and the distribution of the back tension is the most uniform here over the cross-section, which is important for the control of the strip shape of the strip foil 5. It can be known from the discussion in the background art, only can tension evenly distributed on the cross section of the band foil prevent the defects of wave, fold and the like from appearing in the plate shape, and the utility model discloses a cladding of band foil 5 on the roll surface of upper working roll 1 has realized the evenly distributed of tension in the roll gap exit, at the shaping initial stage of band foil rolling, has just eliminated the production of defects such as wave, fold and the like to can obtain the plate shape of preferred. With the continuous outflow of the volume units 9, the far-end tension F6 acting on the cross section of the volume units 9 is gradually increased, the uneven tension trend is obvious, but the back support action of the upper working roll 1 on the strip foil 5 prevents the strip foil 5 from suspending and shaking, stabilizes the plate shape in the key forming period of the strip foil rolling, and further prevents the defects of waves, wrinkles and the like caused by uneven tension of the plate shape.

According to embodiment 2, the utility model discloses at the outlet side of roll gap, make and take paper tinsel 5 to form outlet side cladding arc on the roll surface of last work roll 1, realized the evenly distributed of back tension on outlet side cladding arc, just eliminated the production of defects such as wave, fold at the rolling key shaping initial stage of taking paper tinsel, then prop through the back of last work roll 1 to taking paper tinsel 5 again, make the plate-shape of taking paper tinsel 5 can be stabilized at roll forming's later stage to obtain the plate-shape of preferred. In addition, the torque of the upper work roll 1 is reduced, reducing the energy consumption of the rolling mill.

It should be noted that forming the strip foil 5 into the exit-side wrap arc on the upper work roll 1 is not limited to the flattening roll 3, but includes all post-machine leveling rolls, such as an S-roll, a high-low roll, or a combination thereof. The strip foil 5 can form an outlet side coating arc on the upper working roll 1 only by adjusting a rear adjusting roll which is closest to the roll gap to ensure that the strip foil 5 forms a certain included angle with the rolling central line 6 after coming out of the roll gap. In the present embodiment, the exit-side clad arc is formed on the upper work roll 1, and the exit-side clad arc may be formed on the lower work roll 2 for the same reason.

Example 3:

a structure for realizing that a metal strip foil forms a coating arc on a working roll comprises a rolling mill, a flattening roll 3 arranged on the inlet side of a roll gap of the rolling mill and a flattening roll 3 arranged on the outlet side of the roll gap of the rolling mill, wherein a strip foil 5 is coated on the roll surfaces of different working rolls by adjusting the heights of the flattening rolls 3 on two sides to form an inlet side coating arc and an outlet side coating arc.

Specifically, as shown in fig. 13, in the present embodiment, the strip foil 5 forms an entrance-side clad arc with the lower work roll 2 on the entrance side of the roll gap, and the clad angle α of the entrance-side clad arc is 30 °; the strip 5 forms an outlet-side wrap arc with the upper work roll 1 on the outlet side of the roll gap, the wrap angle β of which is also 30 °. Due to the existence of the inlet-side wrapping arc and the outlet-side wrapping arc, the lower working roll 2 and the upper working roll 1 respectively back-support the strip foil 5.

The role and influence of the entry-side clad arc in rolling have been described in example 1, and the role and influence of the exit-side clad arc in rolling have been described in example 2, and will not be described again here. It is noted that, as shown in fig. 14, at the exit side of the nip, the linear velocity of the lower layer of the volume element 9 is greater than the linear velocity of the upper layer of the volume element 9, and a frictional force F4 acts on the upper layer face of the volume element 9, whereby it can be concluded that the wrapping arc exerts a reverse straightening effect on the curling deformation of the tape foil 5, which to some extent eliminates the curling effect of the layer shift phenomenon on the tape foil 5.

In the production of the strip foil 5, it is necessary to repeatedly roll the strip foil 5 in a plurality of passes, and due to the phenomenon of layer shift, the strip foil 5 is deformed in a one-way curl after each pass of rolling, and although the upper work rolls 1 can reverse-straighten the curl, the curl is not sufficiently removed, and therefore, an improvement is required in the rolling method.

As can be seen from fig. 10, 13, and 14, when the first pass of rolling of the strip foil 5 is completed from left to right, the outflow rate of the upper layer of the strip foil 5 is greater than the outflow rate of the lower layer of the strip foil 5, and the strip foil 5 curls toward the lower work roll 2. After the second pass of rolling of the strip foil 5 is finished from right to left, the outflow speed of the upper layer of the strip foil 5 is smaller than that of the lower layer of the strip foil 5, the strip foil 5 is curled towards one side of the upper working roll 1, so that the curling of the first pass of rolling is reversely corrected, and the like. As can be seen from the above, the total rolling pass of the strip foil 5 is set to an even number of passes, and the curling deformation of the strip foil 5 can be eliminated to the maximum extent.

What is important is that after the first rolling, the neutral surface of the band foil 5 deviates to one side, then the second rolling makes reverse correction to the deviated neutral surface, and after the multiple even rolling, the neutral surface is stabilized at the middle layer part of the band foil 5, thereby ensuring the uniformity of the mechanical property of the band foil 5. By the method, the strict requirement on the rolling center line 6 in the national standard is avoided, the stability of the neutral surface of the band foil 5 is really realized in an engineering way, and the technical problem which cannot be solved in the prior art and the embodiment 1 is solved.

Further, as is clear from fig. 13, since the wrap angle α of the wrap arc on the roll gap entrance side is equal to the wrap angle β of the wrap arc on the roll gap exit side, the contact length and the force applied to the upper and lower surfaces of the band foil 5 and the upper and lower work rolls are the same, which solves the problem of the difference in the bright surfaces of the upper and lower surfaces of the band foil 5, which is also a problem that cannot be solved in embodiment 1 and embodiment 2.

As shown in fig. 15, in the conventional rolling, there is no speed difference in the speed of the strip foil 5 flowing out from the roll gap, and the thinning process can be regarded as squeezing, like squeezing toothpaste. And the utility model discloses well take the foil 5 to exist the speed that flows out from the roll gap poor, to take the foil 5 attenuate process more like the reverse rolling to take the foil 5 upper and lower floor, just like with the rolling pin. As shown in fig. 16, in the repeated rolling process, the upper and lower layers of the band foil 5 are not only pressed by the roll gap but also subjected to a relative tensile force, so that the upper and lower layers of the band foil 5 slip to finally reduce the thickness. The sliding thinning has the effect of extrusion thinning and the effect of rolling thinning, and compared with the traditional extrusion thinning, the plate shape is better, and the control of the plate shape is easier to realize.

As can be seen from embodiment 3, the present invention solves not only the problem of curling deformation of the band foil 5 but also the problem of difference in the bright surface of the band foil 5. It is especially important, the utility model discloses a attenuate that slides has the effect of extrusion attenuate promptly, has the effect of rolling the attenuate with the hands again, makes the middle level position of neutral face stable at band paper tinsel 5 moreover to the homogeneity of band paper tinsel 5 mechanical properties has been guaranteed. The utility model discloses broken through the harsh requirement to rolling central line in the national standard, realized the stability of neutral face really with engineering, solved the technological problem that prior art can not solve, consequently had creativity.

In example 3, the outlet-side clad arc reduces the torque of the upper work roll 1, but the inlet-side clad arc increases the torque of the lower work roll 2, resulting in a difference in the drive torques of the upper and lower work rolls, which increases the energy consumption of the entire rolling mill. Therefore, the technical scheme is continuously improved:

example 4:

a structure for realizing that a metal strip foil forms a coating arc on a working roll comprises a rolling mill, a flattening roll 3 arranged on the inlet side of a roll gap of the rolling mill and a flattening roll 3 arranged on the outlet side of the roll gap of the rolling mill, wherein a strip foil 5 is coated on the roll surface of the same working roll by adjusting the heights of the flattening rolls 3 on two sides to form an inlet side coating arc and an outlet side coating arc.

Specifically, as shown in fig. 17, this embodiment is different from embodiment 3 in that both the entry-side shroud arch and the exit-side shroud arch are formed on the lower work roll 2. As can be seen from fig. 17, the entrance-side clad arc increases the torque of the lower work roll 2, while the exit-side clad arc decreases the torque of the lower work roll 2, and therefore, the driving torque applied to the lower work roll 2 is not changed as a whole.

A disadvantage of this design is that the unidirectional curling of the tape foil 5 is greater than in the above-described exemplary embodiments due to the superposition. The solution is that before each rolling pass, the strip foil 5 is turned over and then enters a roll gap for rolling, so as to eliminate the curling deformation of the strip foil 5 generated during the previous rolling pass. Likewise, the total rolling pass of the strip foil 5 is set to an even number of passes.

The part of the utility model not detailed is prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A structure for realizing the formation of a clad arc of a metal strip foil on a working roll comprises a rolling mill, a front adjusting roll arranged at the inlet side of a roll gap of the rolling mill and a rear adjusting roll arranged at the outlet side of the roll gap of the rolling mill, and is characterized in that: the metal strip foil is coated on the roller surface of a certain working roller by adjusting the height of the front adjusting roller or the rear adjusting roller of the machine to form a coating arc.

2. A structure for achieving the clad arc formation of a metal strip foil on a work roll as claimed in claim 1, wherein: the heights of the front adjusting roller and the rear adjusting roller of the machine are adjusted, so that the metal strip foil is coated on the roller surfaces of the same or different working rollers to form an inlet side coating arc and an outlet side coating arc.

3. A structure for achieving the clad arc formation of a metal strip foil on a work roll as claimed in claim 1, wherein: the coating angle of the coating arc is alpha, and alpha is more than 0 degree and less than or equal to 90 degrees.

4. A structure for realizing the formation of the clad arc of the metal strip foil on the work roll according to claim 1 or 2, wherein: the front adjusting roller and the rear adjusting roller are composed of any one of a flattening roller, an oil squeezing roller, an S roller and a high-low roller or a combination thereof.

5. A structure for achieving the clad arc formation of a metal strip foil on a work roll as claimed in claim 2, wherein: the inlet side coating arc and the outlet side coating arc are coated on the roll surfaces of different working rolls, and the coating angle of the inlet side coating arc of the roll gap is equal to that of the outlet side coating arc of the roll gap.

6. A structure for achieving the clad arc formation of a metal strip foil on a work roll as claimed in claim 2, wherein: the inlet side coating arc and the outlet side coating arc are coated on the roll surface of the same working roll, and the coating angle of the roll gap inlet side coating arc is equal to that of the roll gap outlet side coating arc.

7. A structure for realizing the clad arc formation of the metal strip foil on the work roll according to claim 5 or 6, wherein: the linear speed of the roll surface of the working roll where the wrapping arc at the inlet side is larger than that of the working roll where the wrapping arc at the outlet side is.

8. The structure for forming a clad arc of a metal strip foil on a work roll as claimed in claim 7, wherein: the roll diameter of the working roll with the inlet side coating arc is larger than that of the working roll with the outlet side coating arc.