JP3308892B2 - Laura Leveler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a roller leveler. More specifically, the present invention relates to a roller leveler suitable for reducing internal residual stress generated in a manufacturing process such as rolling or tension leveling of a material to be etched such as a lead frame material or a shadow mask material.

[0002]

2. Description of the Related Art Annealing, stretchers and the like are generally used as means for reducing the internal stress of a rolled sheet material. However, annealing has the drawback of deteriorating material characteristics and deteriorating the shape. There are problems such as poor properties.

On the other hand, it has been known that the internal stress can be reduced even by using a roller leveler, and various internal stress reducing methods using the roller leveler have been studied. Types of the roller leveler include a type using only a work roll, a type in which a backup roll is attached to a work roll, and a type in which an intermediate roll is arranged between a work roll and a backup roll. The type using the intermediate roll includes a type for driving a work roll and a type for driving an intermediate roll.

[0004]

When the internal stress is reduced by a roller leveler, it is impossible to reduce the stress of a thin high-strength material such as a lead frame material or a shadow mask material unless the roll diameter is reduced. . That is, the roll diameter for obtaining a sufficient internal stress reduction effect is represented by the yield rate η in the thickness direction of the sheet due to bending, and the yield rate η is 0.5
The above is required. Here, the yield ratio η will be described with reference to FIG. η = (a + b) / t = 1− (δy · D) / E · C (Equation) where t: plate thickness mm E: Young's modulus N / mm2 δy: yield stress N / mm2 D: roll diameter mm a: Tensile yield area mm b: Compression yield area mm Therefore, the lead frame material is t = 0.125 mm, E =
Assuming that 120,000 N / mm 2 and δy = 550 N / mm 2, since η = 1− (550 × D) / (120,000 × 0.125)> 0.5, D ≦ (0.5 × 120,000 × 0.125) /550=13.6 mm . Therefore, it is necessary to select a roll diameter of 13.6 mm or less.

[0005] A normal production line is required to have a line speed of 200 m / min or more in view of productivity, but if the above-mentioned line speed is to be achieved with a work roll having a roll diameter of 13.6 mm, the work roll is required. Rotation speed of 4681rp
m, the maximum allowable rotation speed of the universal spindle, etc.
It exceeds 2500rpm. Further, when the small-diameter rolls are arranged close to each other, a spindle smaller than the roll diameter is required, and high-speed driving with such a small-diameter spindle is technically impossible.

However, if the intermediate roll driving method is adopted in the roller leveler using the above-mentioned intermediate roll, the diameter of the intermediate roll can be 1.5 to 2 times as large as that of the work roll. Can rotate at a high speed, and the gap between the upper and lower rolls is widened, so that a large universal joint can be applied, and a line speed of 200 meters / minute or more is possible.

However, in general, in a production line, materials of various thicknesses are passed, but all of the target materials are
It requires a small-diameter work roll, so it is inevitable to use an intermediate roll drive system.
Many can be leveled by a work roll drive system with a large roll diameter. In addition, a large work roll has advantages such as a longer life of the roll and less bending, and thus has an advantage that it is difficult to throw away. However, it is not economical to install two roller levelers of the intermediate roll drive system and the work roll drive system in one production line.

In view of such circumstances, the present invention can reduce the internal residual stress of a material having a small thickness and a material having a large thickness, and can pass the material at a high speed to improve the productivity. The purpose is to provide.

[0009]

According to a first aspect of the present invention, there is provided a roller leveler in which a work roll is supported by a backup roll via an intermediate roll, and a roll driving force is transmitted through a pinion nest and a universal joint. The work rolls can be replaced with small-diameter rolls and large-diameter rolls having different diameters, and the intermediate roll can also be replaced with large-diameter rolls and small-diameter rolls having different diameters corresponding to the work rolls. The pinion nest is provided in the same number as the number of the intermediate rolls, and the other end of a universal joint having one end connected to the pinion nest can be selectively connected to the work roll and the intermediate roll. It is characterized by. According to a second aspect of the present invention, there is provided the roller leveler according to the first aspect of the present invention, wherein a free loop of a passing plate material is provided on an exit side, or an entry side and an exit side of the roller leveler. Claim 3
In the roller leveler according to the first aspect of the present invention, the small diameter roll of the work roll is less than 25 mm in diameter, and the large diameter roll is 25 mm or more in diameter.

According to the first aspect of the invention, when leveling a material having a large thickness, a universal joint coming out of the pinion nest is connected to the work roll using a large-diameter work roll, and the work roll is driven. When leveling a thin material, use a small-diameter work roll, replace the intermediate roll with a large-diameter work roll, connect the universal joint to the intermediate roll, and operate with an intermediate roll drive system. it can. For this reason, the internal residual stress of materials having various thicknesses can be effectively reduced by one roller leveler, productivity can be increased at high speed, and equipment cost can be greatly reduced. According to the second aspect of the invention, the front-rear tension of the roller leveler can be reduced to zero by the free side loop of the roller leveler on the exit side and the entrance side and the exit side. In normal roller leveler work, the leveler longitudinal tension cannot be reduced to zero, and internal stress is generated by releasing the tension after leveling, but in the present invention, since there is no leveler longitudinal tension, the internal residual stress is effectively reduced. Can be reduced.
According to the third aspect of the present invention, since the diameter of the small diameter roll of the work roll is less than 25 mm, the processing curvature becomes large, and the internal residual stress is reduced even with respect to a material to be etched such as a lead frame material or a shadow mask material. it can.

[0011]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a roller leveler according to an embodiment of the present invention, and FIG. 2 is a side view (a) and a front view (b) of the roller leveler during operation by a work roll drive system.
FIG. 3, FIG. 3 is a side view (a) and a front view (b) of the roller leveler during operation by the intermediate roll drive system, FIG. 4 is a side view of the roller leveler having a free loop on the output side, and FIG. It is a side view of the roller leveler provided with the free loop on the side and the exit side.

In FIG. 1, reference symbol S denotes a plate material to be leveled. Work rolls 1, 1 are disposed above and below the plate material, and the work rolls 1, 1 are supported by backup rolls 3, 3 via intermediate rolls 2, 2. ing. The number of the work rolls 1 and 1 is five in the upper stage and six in the lower stage, and the number of the intermediate rolls 2 and 2 is six in the upper stage and seven in the lower stage, but this is an example. The present invention includes a smaller number or a larger number. 4 is a pinion nest, 5 is a speed reducer, and 6 is a motor. 7 is a universal joint, one end of which is connected to a pinion nest, and the other end of which is the work roll 1, 1
Alternatively, it can be selectively connected to the intermediate rolls 2, 2.

The work rolls 1, 1 are interchangeable between small-diameter rolls and large-diameter rolls, and correspondingly, the intermediate rolls 2, 2 are also provided with large-diameter rolls and small-diameter rolls. I have.

It is preferable that the small-diameter rolls of the work rolls 1 and 1 have a diameter of less than 25 mm, and the large-diameter rolls have a diameter of 25 mm or more. Using a small-diameter roll with a diameter of less than 25 mm increases the processing curvature, so the internal residual stress can be effectively reduced even for materials that are difficult to reduce the internal residual stress, such as lead frame materials and shadow mask materials. Can be reduced.

FIG. 2 shows a work roll driving system, in which a universal joint 7 is connected to the work rolls 1 and 1. This operation method can be applied to the case where the large-diameter work rolls 1 and 1 are used, and is suitable, for example, for leveling a thick material. Of course, since the work rolls 1 and 1 themselves have a large diameter, a thick universal joint 7 is used as it is, and high-speed rotation is possible. Therefore, high productivity can be maintained. When the work rolls are driven, the number of work rolls is two less than the number of intermediate rolls. Therefore, it is preferable to remove the two universal joints 7 at the front and rear ends in the line direction.

FIG. 3 shows an intermediate roll driving system, in which the universal joint 7 is connected to the intermediate rolls 2 and 2. In this operation method, even if the small-diameter work rolls 1 and 1 are used, since the large-diameter intermediate rolls 2 and 2 are driven, the thick universal joint 7 can be used as it is, and high-speed operation is possible. There is an advantage in that the processing curvature can be increased and the internal residual stress can be effectively reduced even for a material having a small thickness.
Note that the rotation direction of the motor 6 must be opposite to that of the work roll driving method.

FIG. 4 shows an example in which the free loop FL of the plate material S is provided on the output side of the roller leveler A having the above-described configuration, and FIG. 5 shows an example in which the free loop FL is provided on the input side and the output side of the roller leveler A. These free loops FL are supported by a pair of guide rolls 8 and the like, and allow the plate S to hang down between them to prevent tension from being generated in the plate S in the roller leveler A. It is known that if a longitudinal tension is applied to the material in the plate passing through the roller leveler, it is difficult to remove the internal residual stress. However, according to the embodiments of FIGS. Since no longitudinal tension is applied to the material, the internal residual stress can be effectively reduced.

[0018]

According to the first aspect of the present invention, when leveling a material having a large thickness, it can be operated by a work roll driving method using a large-diameter work roll, and leveling a material having a small thickness. In some cases, a small-diameter work roll can be used to operate with an intermediate roll drive system. For this reason, the internal residual stress of materials having various thicknesses can be effectively reduced by one roller leveler, productivity can be increased at high speed, and equipment cost can be greatly reduced. According to the second aspect of the present invention, the free loop allows the leveler longitudinal tension to be zero, and the internal residual stress can be effectively reduced. According to the third aspect of the present invention, the processing curvature is increased, and the internal residual stress can be reduced even for a material to be etched, such as a lead frame material or a shadow mask material.

[Brief description of the drawings]

FIG. 1 is a front view of a roller leveler according to an embodiment of the present invention.

FIG. 2 is a side view (FIG. 2A) and a front view (FIG. 2B) of a roller leveler operating by a work roll drive system.

FIGS. 3A and 3B are a side view (a) and a front view (b) of the roller leveler during operation by the intermediate roll driving method.

FIG. 4 is a side view of a roller leveler provided with a free loop on an output side.

FIG. 5 is a side view of a roller leveler provided with a free loop on an entrance side and an exit side.

FIG. 6 is an explanatory diagram of a yield rate of a plate material.

[Explanation of symbols]

 A Roller leveler 1 Work roll 2 Intermediate roll 3 Backup roll 4 Pinion nest 7 Universal joint FL Free loop

Claims (3)

(57) [Claims] The work roll is supported by a backup roll via an intermediate roll, and a roll driving force is transmitted through a pinion nest and a universal joint. The work roll has a small diameter having a different diameter. The roll and the large-diameter roll can be replaced, and the intermediate roll can also be replaced with a large-diameter roll and a small-diameter roll having different diameters corresponding to the work rolls, and the pinion nest has the same number of the intermediate rolls as the number of the intermediate rolls. A roller leveler, wherein the same number is provided, and the other end of a universal joint having one end connected to the pinion nest can be selectively connected to the work roll and the intermediate roll. 2. The roller leveler according to claim 1, wherein a free loop of a passing plate material is provided on an exit side, or an entrance side and an exit side of the roller leveler. 3. A small diameter roll of the work roll has a diameter of 25.
2. The roller leveler according to claim 1, wherein the diameter of the large-diameter roll is less than 25 mm.