JP2971345B2 - Thermal transfer roll, method of manufacturing the same, and apparatus for manufacturing a laminated metal plate using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat transfer roll for heating or cooling a thin metal plate or roll by contacting or winding, a method for manufacturing the heat transfer roll, and a manufacturing apparatus for a laminated metal plate using the same. .

[0002]

2. Description of the Related Art The present applicant has filed Japanese Patent Application No.
At 50056, as shown in FIG.
1 is heated to a temperature equal to or higher than the temperature required for bonding the resin film 102 and lower than the temperature at which the degree of crystallinity (BO) is reduced by the heating roll 104 in the former stage.
A concave portion 1 having a high surface temperature capable of lowering the degree of crystal orientation and having a surface corresponding to the bottom position of the can container.
06, and then contact the resin film 102 with the laminating roll 107.
An apparatus 100 for manufacturing a laminated metal sheet for a drum bottom integrated type can that laminates the same is disclosed. From the laminated metal plate manufactured by the manufacturing apparatus 100, a blank is taken out around the portion where the concave portion 106 faces, and the blank is subjected to press working such as deep drawing, whereby the can body and the can bottom are removed. An integrated can member is obtained. Note that, of the blank, a portion facing the concave portion 106 becomes a can bottom portion,
The remaining donut-shaped portion becomes the can body. The present manufacturing apparatus 10
0, high heat is applied to the metal sheet other than the portion corresponding to the concave portion 106, that is, high heat is applied to the metal sheet in the portion corresponding to the can body, so that the adhesive force of the resin film in the portion corresponding to the can body And the resin film in the can body can withstand the strong processing received during press working such as deep drawing. In addition, since it adheres to the can body part in a high heat state, the degree of crystal orientation of the resin film in this part is reduced, but this degree of crystal orientation can be increased by strong processing performed during press working such as deep drawing. Therefore, the can member obtained by integrating the can body and the can bottom thus obtained has a high degree of crystal orientation in both the can body portion and the can bottom portion. Denting resistance (an index of impact resistance indicating that the film is less likely to crack when dents occur in the can).

[0003]

However, when a laminated steel plate for a can bottom integrated type can is actually manufactured using the final heating roll 105 having a recess 106 corresponding to the above can bottom position on the surface thereof, It is possible to control the temperature of the film, that is, to control the degree of crystal orientation, but the degree of crystal orientation of the steel plate portion corresponding to the blank can body is not uniform as a whole, and the variation in the degree of crystal orientation is constant. It became clear that it occurred in. That is, the heating pattern of the surface development diagram 105p of the final heating roll shown in FIG.
Among the portions of the steel plate corresponding to a, the degree of crystal orientation of the portion of the steel plate corresponding to the portion 105b connecting the recesses 106 at the shortest distance is as high as the degree of crystal orientation of the portion of the steel plate corresponding to the recess 106. I understood that. This is because, after the steel sheet 101 is heated by the final heating roll 105 and before the steel sheet 101 reaches the position of the laminating roll 107, heat radiation from the steel sheet portion corresponding to the portion 105b to the atmosphere is large. It seems to be due to.

Accordingly, in order to lower the degree of crystal orientation (that is, increase the temperature) of the portion of the steel plate corresponding to the portion 105b connecting the concave portions 106 at the shortest distance, the surface temperature of the final heating roll 105 must be increased. No. However, this causes a problem that the temperature of the steel plate corresponding to the portion 105c other than the portion 105b connecting the concave portions 106 at the shortest distance in the blank can body position 105a becomes excessively high.

[0005] In order to prevent the temperature of the steel plate portion corresponding to the portion 105c from excessively rising, this portion 105c of the thermal transfer surface and the portion 105 not subjected to blanking are removed.
It is conceivable to provide a larger recess in d.

However, a large concave portion is provided only in the portion 105d that is not used for blank removal, and thereby,
It is sufficient that the temperature of the portion of the steel plate corresponding to the portion 105c can be prevented from excessively rising and can be kept uniform within a predetermined temperature range, but the portion 10 that is not subjected to blank removal is required.
If this is not possible, for example because the area of 5d is small, consider other means that can prevent the temperature of the portion of the steel plate corresponding to the portion 105c from rising too high and keep it uniform within a predetermined temperature range. There must be. this,
As another means, it is conceivable to provide a large recess in the portion 105c. In this case, a large temperature difference (immediate temperature unevenness) occurs between the portions in the portion of the steel plate corresponding to the large recess. It is expected that it will be difficult to keep all of the portions of the steel plate corresponding to the large recess within a predetermined temperature range.

[0007] The present invention has been made in view of such a point, and an object of the present invention is to provide a metal plate with a temperature distribution by using means other than the means for providing a large concave portion. Another object of the present invention is to provide a thermal transfer roll which can provide a fine temperature distribution without any unevenness on a metal plate by using this means. Another object of the present invention is to provide a method for manufacturing the thermal transfer roll. Another object of the present invention is to provide an apparatus for manufacturing a laminated metal plate using the thermal transfer roll.

[0008]

In order to achieve the above object, the present invention relates to a heat transfer roll for heating or cooling a metal sheet or a roll by contacting or winding the metal sheet. A large number of small holes are formed on the surface of the heat transfer roll so that heat transfer with the metal sheet has a predetermined pattern.

In order to achieve the above object, the present invention provides a method for heating a thin metal sheet to a temperature higher than a temperature required for bonding a resin film and lower than a temperature lowering a degree of crystal orientation by a heating roll in a preceding stage, In a manufacturing apparatus for a laminated metal sheet, the metal sheet has a high surface temperature capable of reducing the degree of crystal orientation, and is brought into contact with a final heating roll having a concave portion corresponding to the bottom position of the can container on the surface. The small holes according to the first aspect of the present invention are provided on the surface of the final heating roll excluding the concave portions.

In the first or second aspect of the present invention, the small holes are preferably provided in a dense structure.

In any one of the first to third aspects of the present invention, it is preferable to design the arrangement pattern of the small holes based on the temperature distribution of the metal plate heated using the thermal transfer roll before the small holes are provided.

[0012]

[Effect] The heat transfer pattern of the surface, small holes, after thermal transfer,
Since the small holes and their surrounding temperatures are obtained by providing a large number of holes at a pitch that can be averaged, a heat transfer pattern that is free from any irregularity and that is finely controlled can be obtained. Here, the small holes, after thermal transfer, to provide a large number of small holes and their surroundings at a pitch capable of averaging each other, and after the heat is transferred from the thermal transfer roll,
Within the time required to proceed to the laminating position, heat is transferred from the portion of the metal plate corresponding to the periphery of the small hole to the portion of the metal plate corresponding to the small hole portion, and the portion of the metal plate corresponding to the small hole portion And the temperature of the portion of the metal plate corresponding to the periphery of the small hole means that the small holes are provided at a pitch substantially equal to each other. The maximum value is determined, the maximum value of the diameter of the small hole is determined, and the small holes are arranged with a pitch interval within this maximum value and a diameter within this maximum value. The arrangement pattern of the small holes can be designed, for example, based on the temperature distribution of the metal plate heated using the thermal transfer roll before the small holes are provided. That is, by observing the temperature distribution of the metal plate, a large number of small holes are arranged corresponding to the portion where the temperature is to be reduced, and the pitch is reduced or the diameter is increased in the portion where the temperature is to be lowered. Arrange the holes.

[0013] Heating the metal sheet to a temperature higher than the temperature required for bonding the resin film and lower than the temperature at which the degree of crystal orientation is reduced by the preceding heating roll, and then lowering the degree of crystal orientation of the metal sheet. In the apparatus for manufacturing a laminated metal plate, which has a high surface temperature capable of being brought into contact with a final heating roll having a concave portion corresponding to the bottom position of the can container on the surface, the surface of the final heating roll other than the concave portion, By arranging a large number of small holes according to a predetermined design, all the portions of the metal plate corresponding to the can body portion of the blank can be uniformly kept within a predetermined narrow temperature range.

Since the small holes are provided in a dense (honey) structure, the amount of heat transmitted from this portion to the metal plate can be reduced. , The heat transfer amount can be designed in a wide range from the heat transfer amount to the portion having no small holes.Therefore, by including the arrangement of the small holes in the dense structure, the heat transfer pattern by providing a large number of small holes can be designed. The range of design can be greatly expanded. Here, the dense structure refers to a structure in which small holes are arranged at the vertices of an equilateral triangle.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described in detail with reference to the drawings. This embodiment is a laminated steel sheet manufacturing apparatus for a can bottom and a can body integrated type can. In the laminated metal sheet manufacturing apparatus shown in FIG. 2, a heat transfer roll 1 described later is used instead of the final heating roll 105. It is.

As shown in FIG. 1A, a thermal transfer roll 1
Has a surface 2 having a circular cross section, and this surface is a heat transfer surface that contacts a metal plate and transfers heat to the metal plate. In addition,
Heat is generated on the thermal transfer surface 2 by a predetermined heat generating means such as a heat generating means by electromagnetic induction and a heat generating means by an oil heater incorporated in the heat transfer roll 1. As shown in FIG. 1 (b), the thermal transfer surface 2 is provided with a concave portion 3 having a shape (circular in this embodiment) substantially equal to the can bottom of a can container (not shown). In addition, the recesses 3 are arranged at predetermined intervals so that a blank 4 having a predetermined diameter centering on the recesses can be drawn. That is, FIG.
The recesses 3 are arranged at the respective vertices of a square lattice extending in a direction inclined at 45 ° from the left-right direction in FIG. This blank 4 is cut out to become a can-making material.

Next, in this embodiment, a small hole is formed in a predetermined portion 8 other than a portion 6 which is a position where a blank is not removed and a portion 7 which connects the concave portions 3 in the can body 5 of the blank 4 with the shortest distance. 11 and 12 are arranged. In the region where the small holes are arranged, the small holes 11 having the dense structure are arranged in the square region which is maximally accommodated in the portion 6 where the blank is not removed, and the region other than the square region includes: The small holes 12 are arranged in a square lattice, that is, at the apexes of the square lattice. In the square area, the small holes 11 are, for example, 2 m in diameter to reduce the amount of heat transfer.
m, pitch s = 5 mm and arranged in a dense structure.
Here, the dense structure refers to a structure in which small holes 11 are arranged at the vertices of an equilateral triangle, as shown in FIG. In an area other than the square area, in order to obtain a predetermined high heat transfer amount, the small holes 12
And a predetermined pitch with a predetermined small diameter and a predetermined large pitch under the condition of "a pitch at which the ambient temperature and the surrounding temperature can be averaged with each other".

Next, an example of a method for determining the arrangement position and arrangement shape of the small holes 11, 12 and the diameter and pitch of the small holes will be described.

First, a laminated steel sheet is actually manufactured using the conventional thermal transfer roll 105 having only the concave portion 3 (recess portion 106). Then, the degree of crystal orientation of the resin film is examined. Then, the surface temperature of the thermal transfer roll 105 is increased until the degree of crystal orientation of the portion of the steel plate corresponding to the portion 7 connecting the concave portions with the shortest distance becomes a predetermined low value,
Again, manufacturing a laminated steel sheet and checking the degree of crystal orientation is repeated.

Then, a portion 7 connecting the concave portions with the shortest distance
When a steel sheet having a degree of crystal orientation of a portion of the steel sheet corresponding to a predetermined low value is obtained, next, the degree of crystal orientation of all parts of the steel sheet is examined, and a distribution map of the degree of crystal orientation is created, Based on this, a temperature distribution map of all parts of the steel sheet is created. Next, based on this temperature distribution map, a portion where the temperature of the portion of the steel plate corresponding to the blank can body is higher than the temperature in the predetermined range can be found, so in order to keep the temperature of this portion within the predetermined range. It is supposed that where small holes should be provided at what pitch and at what size, and the small holes are actually opened in the final heating roll 105. Then, using this final heating roll, a laminated steel sheet is manufactured, the degree of crystal orientation of all parts of the steel sheet is examined, a distribution map of the degree of crystal orientation is created, and the temperature of all parts of the steel sheet is based on this. A distribution map is created, and it is confirmed that all of the steel plate portions corresponding to the blank can body are within a predetermined temperature range, and the production of the final heating roll is completed. Thus, the thermal transfer roll 1 of the present invention shown in FIG. 1 is obtained.

It should be noted that, in the above-mentioned estimation, when there is a part corresponding to the can body part of a blank of a laminated steel sheet manufactured using a thermal transfer roll manufactured by providing a small hole, and there is a part that is not within a predetermined temperature range. In that part, while maintaining the condition that "the pores are provided at a pitch at which the temperature of the pores and their surroundings can be averaged after thermal transfer," the pores are already formed between the pores again. The diameter and arrangement of the holes by opening, increasing the already opened small holes, closing the already opened small holes, or closing the already opened small holes and then re-opening a smaller diameter hole in this part The position can be corrected so that all of the portions of the steel plate corresponding to the blank can body are within a predetermined temperature range.

As shown in FIG. 2, the apparatus for manufacturing a laminated steel sheet for a can bottom-integrated can, as shown in FIG.
The heat transfer roll 1, the tension roll 110, the resin film 102, and the laminating roll 10 of the present invention used in place of the former heating roll 104 and the final heating roll 105.
7. A laminating roll backup roll 111 and a marking device 112 are provided. The marking device 112 is a device for making a predetermined mark on the laminated steel sheet to clarify the position of blanking,
Blanking is performed later using the mark provided by the device 112 as a guide.

The present embodiment is configured as described above. The temperature of the thin metal plate 101 is higher than the temperature required for bonding with the resin film on the bottom of the can via the pre-heating roll 104 and lowering the degree of crystal orientation. Heated to less than. As a result, the degree of crystal orientation in the resin film at the bottom of the can is maintained at a predetermined high value, so that the predetermined denting resistance (impact resistance indicating that the film is unlikely to crack when dents occur in the can) Sex index). Then, by being supported by the tension roll 110 and abutting against the final heating roll 1, the portion of the thin metal plate corresponding to the blank can body is heated to a temperature at which high adhesion to the resin film is obtained. And metal sheet 101
, The resin film 102 is supplied in a sandwich form from both sides, and the resin film 102 is laminated on the thin metal plate 101 by the laminating roll 107. As a result, the metal sheet 1 laminated on the resin film 102
01 and the resin film 1 at the bottom of the blank can
02 has a high degree of crystal orientation, and the resin film 102
Has a low degree of crystal orientation and is in close contact with the metal sheet 101. At this time, since the thermal transfer roll 1 having a large number of small holes according to the present invention is used as the final heating roll 1, the heating distribution of the metal sheet 101 is not uneven, and is finely controlled. Temperature rises evenly,
All of the resin film 102 in this portion has a sufficiently low degree of crystal orientation and is in close contact with the metal sheet. The metal thin plate 101 on which the resin film 102 is laminated is marked by a marking device 112 with a predetermined mark for blanking.

Thereafter, the blanks are taken out of the metal sheet 101 on which the resin film 102 is laminated by pressing based on predetermined marks for blanking.
Then, each blank is subjected to deep drawing by a press, and a can in which the can bottom and the can body are integrated is manufactured.
At this time, the can body of the blank is strongly wrung and becomes cylindrical, but since the resin film is sufficiently adhered to the can body at any part, the resin film 102 is sufficiently blanked at any part. With the can body, it shifts to a cylindrical shape. In addition, along with this transition, the degree of crystal orientation of the resin film 102 in the body of the can is increased to such an extent that predetermined denting resistance can be obtained in any part. The can bottom and can body integrated can member thus obtained are:
In both the can bottom and the can body, the degree of crystal orientation is high, a predetermined denting resistance is obtained, and even if dents occur in the can in any of the can bottom and the can body, it is difficult for the film to crack. .

Next, a second embodiment of the present invention will be described. In the present embodiment, the use of the edge heater is omitted by using the heat transfer roll of the present invention in the production of a laminated steel sheet. That is, when the metal sheet is heated by the thermal transfer roll, in order to equalize the temperature distribution between the portion where the natural cooling is fast at both ends in the width direction of the metal sheet and the portion where the natural cooling is slow at the center, conventionally, the metal sheet is An edge heater that particularly heats both ends is used. However, in order to make the temperature distribution after the natural cooling between the both ends and the central part in the width direction of the metal sheet uniform, the heat given to the metal sheet by the heat transfer roll is large at both ends in the width direction of the metal sheet in advance. And it needs to be reduced in the central part. That is, since both ends cool faster than the central part by the subsequent natural cooling, the temperatures at both ends and the central part can be equalized after the natural cooling. Therefore, according to the present invention,
Open a small hole of a predetermined diameter and a predetermined pitch, and toward the center,
Increase the diameter or decrease the pitch. By this heat transfer roll, both ends are larger in heat transfer amount than the center of the metal sheet, and heat transfer is performed in each part.
It can be precisely controlled to a predetermined value,
In addition, after the heat is transferred, the temperatures of the small holes and the surroundings thereof are averaged to each other, so that there is no temperature unevenness. Thus, a metal sheet having an ideal uniform temperature distribution after natural cooling can be obtained.

In the first and second embodiments, the heat transfer roll for transferring heat to a thin metal plate has been described. However, the present invention transfers heat to a roll for transferring heat by contacting a thin metal plate, ie, transferring heat. It goes without saying that the present invention is also applied to a thermal transfer roll for indirect transfer. Although the first and second embodiments have been described with respect to a heating roll, the present invention is also applied to a cooling roll in a case where a thin metal plate is heated and then cooled to obtain a predetermined temperature pattern. Of course, the cooling roll is also included in the meaning of the phrase of the thermal transfer roll.

[0027]

As described above, according to the present invention, the small holes are formed at a pitch capable of averaging the temperatures of the small holes and their surroundings after thermal transfer.
Since a large number of thermal transfer rolls are used for thermal transfer to a thin metal plate or a roll, the temperature of the thin metal plate can be controlled evenly and finely.

[Brief description of the drawings]

FIG. 1 is a diagram of one embodiment of a thermal transfer roll of the present invention;
2A is a front view, FIG. 2B is a developed surface view, and FIG. 2C is an enlarged view of the arrangement of the small holes in the square area shown in FIG. 1B.

FIG. 2 is a conceptual diagram of a laminated metal sheet manufacturing apparatus.

FIG. 3 is a developed view of the surface of a conventional thermal transfer roll.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Thermal transfer roll 2 Surface 3 Concave part 11,12 Small hole 101 Metal thin plate 102 Resin film 104 Heating roll at the former stage

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16C 13/00 B21D 51/26 B32B 15/08 B32B 31/20

Claims (4)

(57) [Claims] 1. A heat transfer roll for heating or cooling a metal sheet or a roll by contacting or winding the metal sheet on a metal sheet so that heat transfer between the heat transfer roll and the metal sheet has a predetermined pattern. A thermal transfer roll having a large number of small holes formed on the surface of the thermal transfer roll. 2. The metal sheet is heated by a preceding heating roll to a temperature higher than the temperature required for bonding the resin film and lower than the temperature at which the crystal orientation is reduced, and then the metal sheet is reduced in the crystal orientation. In the apparatus for manufacturing a laminated metal plate, which has a high surface temperature capable of being brought into contact with a final heating roll having a concave portion corresponding to the bottom position of the can container on the surface, the concave portion of the final heating roll Claim 1 on the surface excluding
An apparatus for producing a laminated metal sheet, characterized in that the small hole according to (1) is provided. 3. The apparatus according to claim 1, wherein the small holes are provided in a dense structure. 4. The method according to claim 1, wherein the arrangement pattern of the small holes is designed based on a temperature distribution of a metal plate heated by using a thermal transfer roll before the small holes are provided. A method for producing a thermal transfer roll.