JP3317269B2 - Gravure printing roll and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lightweight aluminum gravure printing roll having good shape accuracy and a method of manufacturing the same.

[0002]

2. Description of the Related Art A gravure printing roll has a structure in which flanges are attached to openings at both ends of a printing drum which forms irregularities corresponding to a printing pattern on the outer peripheral surface, and bearings are provided in holes formed in the flanges. In recent years, a roll made of aluminum or aluminum alloy (hereinafter, collectively referred to as aluminum) having excellent lightweight properties has been used instead of iron. A gravure printing roll made of aluminum is usually manufactured by a process as shown in FIG. For example, 6000 series-
A roll 10 serving as a base of a printing surface is prepared with an extruded pipe of T5 material, and a DC cast product of 4000 series-T6 material is cut out to prepare a flange 20 (a). In order to spigot-connect the flange 20 to the roll 10, an inner peripheral surface of the end of the roll 10 is cut to form the spigot portion 11, and a hole 21 for mounting a rotating shaft is drilled in the flange 20 (b).
Flange 20 is attached to the spigot part 11 with a step by cutting.
And the flange 20 is joined to the end of the roll 10 by press fitting, shrink fitting, bonding, welding, or the like (c). Next, the outer peripheral surface 12 of the roll 10 and the outer surface 22 of the flange 20 are chamfered (d), and the surfaces are activated by zincate treatment or the like, and then the outer peripheral surface 12 and the outer surface 22 have a thickness of 60 to 150 μm.
By forming a Cu plating layer 31 of a degree (e) and polishing the surface (f), the roll manufacturing process is completed.

When the manufactured roll is used for printing, a thick Cu plating layer 32 used as a printing surface is provided on the Cu plating layer 31 (g). Thick Cu plating layer 32
Is applied with a thickness of 80 to 100 μm. When used for repeated printing, the Cu plating layer 31 is formed by ballad plating so that the thick Cu plating layer 32 can be easily peeled off.
After immersing the roll 10 formed with the above in a silver nitrate solution, the thick Cu plating layer 32 is formed. When the thick Cu plating layer 32 is semipermanently used for a printing surface, the thick Cu plating layer 32 is provided directly on the Cu plating layer 31. Thick film C
A concave portion 33 serving as an ink pit during gravure printing is formed in the u plating layer 32 (h). The recess 33 is a sculpture,
It is formed to a depth of 30 to 60 μm by etching or the like. The thick film Cu plating layer 32 in which the concave portion 33 is formed is subjected to chrome plating in order to increase durability, and gravure printing is performed as a printing surface (i). When changing the printing surface, the thick Cu plating layer 32 is peeled off, the thick Cu plating layer 32 is newly provided on the Cu plating layer 31, and a concave portion 33 having a necessary pattern is formed (j).

[0004]

During the printing operation, gravure printing rolls are frequently replaced. The workability of the roll exchange can be improved by using a lightweight aluminum roll, but the weight reduction is not limited to the selection of the material, and the roll 10 needs to be thinner. As the thickness of the roll 10 is reduced, it is also desired to improve the joining methods, such as press-fitting, shrink fitting, bonding, and welding, which have been conventionally employed. For example, in the case of press fitting or shrink fitting, it is inevitable that the end opening of the roll 10 is opened, and it is difficult to reduce the wall thickness to 10 mm or less in consideration of the joining strength. In the method of bonding the flange 20 to the roll 10, the adhesive may be dissolved in the solvent of the printing ink, and the bonding strength may be reduced.

[0005] It is known that the flange 20 is melt-bonded to the roll 10 (Japanese Patent Laid-Open No. 1-145196), but distortion tends to occur in the welded portion due to heat input during welding. When the thickness of the roll 10 is reduced, the difference in heat capacity between the roll 10 and the flange 20 increases, so that the distortion generated in the roll 10 also increases. When a heat-treated alloy material is used, the softened area of the heat-affected zone is widened and the strength is reduced. By the way, in the gravure printing roll, if the outer peripheral surface 12 including the vicinity of the end portion is distorted, the ink other than the engraved portion cannot be sufficiently removed by the scraper K (FIG. 9) or the like, resulting in poor printing. The distortion is also a factor that hinders the smooth rotation of the gravure printing roll. Therefore, in the case of ordinary welding, the roll 10 is manufactured by increasing the thickness of the roll 10 and welding it to the flange 20, and after welding, cutting the surface of the roll 10 deeply. However, in this welded product, since the heat input is high, the temperature is high, good dimensional accuracy cannot be obtained due to expansion, and surface cutting cannot be performed immediately. Also,
Since subsequent deep surface cutting is required, the reduction in productivity is caused in making the roll 10 thinner. A Cu plating layer 31 is formed on the outer peripheral surface 12 of the roll 10 including the outer surface of the flange 20 where the welded portion is formed, and a thick Cu plating layer 32 serving as a printing surface is formed on the Cu plating layer 31. Provided. However, defects such as blowholes and pinholes are present in the welded portion, and the Cu plating layer 31 formed on the welded portion tends to have an uneven surface reflecting the blowholes and pinholes. Cu plating layer 3 with uneven surface
1, the thick Cu plating layer 32 is formed,
The plating layer 32 mechanically meshes with the Cu plating layer 31 due to the unevenness, so that the thick Cu plating layer 32 is less likely to peel off when the printing surface is changed.

[0006]

SUMMARY OF THE INVENTION The present invention has been devised to solve such a problem. A flange is welded to an inner peripheral surface of a roll inside the flange, and a gap between the roll and the flange is provided. By improving the heat balance, it is possible to easily peel off the thick Cu plating layer at the time of printing surface renewal, to suppress the occurrence of welding distortion even if the roll is made thinner, and to provide a lightweight gravure printing roll that can be easily replaced. The purpose is to do. The gravure printing roll of the present invention includes, in order to achieve the object, an aluminum roll having a spigot portion formed on both inner surfaces, and a flange fitted into the spigot portion, and the inner surface of the flange and the inner surface of the aluminum roll. And a groove or a recess is formed near the welded portion of the flange. By forming a groove or recess near the weld, the effective heat capacity of the flange can be reduced and the heat balance between the roll and the flange can be improved. Also, since the effective heat capacity can be reduced, the surface can be cut immediately. As the groove, one or more continuous or interrupted grooves are formed on the inner surface of the flange concentrically with the outer peripheral surface of the flange. Alternatively, one or more circumferential grooves extending from the outer peripheral surface of the flange toward the center are formed on the outer peripheral surface of the flange near the welded portion. The circumferential groove is also formed in a continuous state or an intermittent state. In addition, a concave portion having a step from the vicinity of the welded portion may be formed on the inner surface of the flange.

[0007] This gravure printing roll forms a stepped inset portion on both inner surfaces of an aluminum roll,
Manufactured by fitting a flange with a groove or recess formed on the inner or outer surface located near the welded portion into the spigot part of an aluminum roll, and welding between the both end surfaces of the aluminum roll and the inner surface of the flange. Is done.
The roll and the flange can be welded at a high speed at a welding speed of 2 to 7 m / min. In the case of high-speed welding, the influence of thermal imbalance between the roll and the flange is reduced. Therefore, when high-speed welding is used in addition to the formation of the groove or the concave portion, the heat balance is further improved, and the welding distortion is further reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS When changing the printing surface of a gravure printing roll, if the mechanical engagement of the thick Cu plating layer 32 with the Cu plating layer 31 is strong, it is difficult to peel off the thick Cu plating layer 32 as described above. become. In particular, in a gravure printing roll in which the flange 20 is welded to the roll 10, unevenness of the Cu plating layer 31 caused by a welding defect causes an increase in the engagement force. Welding defects such as blowholes and pinholes that cause surface irregularities of the Cu plating layer 31 are reduced to some extent by the improvement of welding conditions, but are not eliminated. Further, although no welding defect is detected in the appearance observation, there is a welding defect that is exposed when the outer peripheral surface 12 of the roll 10 and the outer surface 22 of the flange 20 are chamfered.

Therefore, in the present invention, on the premise that occurrence of welding defects is inevitable, the inner peripheral surface 13 of the roll 10 is provided inside the flange 20 so as not to affect the surface condition of the Cu plating layer 31. The flange 20 is welded. As a result, the outer surface 22 after the surface grinding becomes a smooth surface without any irregularities, and the Cu plating layer 31 having a small surface roughness suitable for peeling the thick Cu plating layer 32 can be formed. In order to weld the flange 20 to the inner peripheral surface 13 of the roll 10 inside the flange 20, a welding torch 40 having a bent tip as shown in FIG. 2A is used, or as shown in FIG. The long torch 42 is inserted from the flange 20 as shown in FIG.
0 'and the inner peripheral surface of the roll 10 are welded. The flange 20 is fitted into the spigot portions 11 formed on the inner surfaces on both sides of the roll 10, and the welding torch 40 is inserted through the rotary shaft mounting hole 21 formed in the flange 20.

The tip of the welding torch 40 is directed to a corner 41 between the inner peripheral surface 13 of the roll 10 and the inner surface 23 of the flange 20, and the welding torch 40 or the roll 10 is welded.
To rotate. The welding wire is fed along the curved shape of the welding torch 40 or from the opposite side. Thereby, the welded portion W is formed at the corner portion 41 over the entire length of the inner peripheral surface 13 of the roll 10. Thus, when the flange 20 is welded to the roll 10 on the inner surface 23, the outer surface 22 is maintained at the original smooth surface. Therefore, the Cu plating layer 31 formed on the outer side surface 22 also has a smooth surface, and it is possible to form the thick Cu plating layer 32 that is easily peeled.

When the roll 10 and the flange 20 are welded, if the heat balance is poor, the outer peripheral surface 1
2 is distorted. The roll 10 usually has a thickness of 20 to
Since the thickness is thinner than that of the flange 20 of 30 mm, the heat input during welding is larger in the roll 10 than in the flange 20. Therefore, the thin roll 10 is exposed to a high temperature for a long time. As a result, the thermal expansion of the roll 10 increases, and remains as distortion after welding. As the roll 10 is made thinner for weight reduction, the heat balance becomes more disturbed, and the occurrence of welding distortion becomes remarkable. The thermal balance between the roll 10 and the flange 20 is improved by forming grooves or recesses that reduce the effective heat capacity of the flange 20 that affects thermal deformation during welding. In addition, it is further improved by adopting high-speed welding that does not give a large amount of heat to the welded portion. As a result, welding distortion that tends to occur in the roll 10 is suppressed.

As a groove to be attached to the flange 20, there is a ring-shaped continuous groove 24 (FIG. 3) on the inner surface 23 near the welded portion W. Due to the formation of the continuous groove 24, the heat flow path through which the heat input to the welded portion W escapes to the main body side of the flange 20 is narrowed, and the effective heat capacity of the flange 20 is reduced. As a result, the heat balance between the roll 10 and the flange 20 is improved, and the thermal deformation due to the heating of the roll 10 and thus the welding distortion are suppressed. The size of the continuous groove 24 varies depending on the material and size of the roll 10 and the flange 20 to be welded and the processing conditions, and is not determined uniquely. For example, the groove width is 3 to 30 mm and the groove depth is 2 to 2. When formed at 10 mm and 5 to 15 mm inside from the outer peripheral surface 29 of the flange 20, the effective heat capacity is effectively reduced.

Instead of the continuous groove 24, the recess 25 (FIG. 4) may be formed in the central portion by increasing the thickness only in the vicinity of the welded portion W. As grooves and recesses, intermittent grooves 26 (FIG. 5a) or intermittent recesses 27 (FIG. 5b) are formed on the inner surface 23 of the flange 20, and a plurality of continuous or intermittent grooves 26 (FIG. 5c) are formed concentrically. May be. Even if the circumferential groove 28 (FIG. 6A) is formed on the outer peripheral surface 29 of the flange 20, the heat balance between the roll 10 and the flange 20 is improved. Similarly, the circumferential groove 28 may be a continuous groove or an intermittent groove, and a plurality of circumferential grooves 28 may be formed on the outer peripheral surface 29 of the flange 20 along the center axis direction (FIG. 6B). Also, a flange 20 (FIG. 6c) in which a circumferential groove 28 is formed on an outer peripheral surface 29 and a continuous groove 24, a concave portion 25, an intermittent groove 26, or an intermittent concave portion 27 is formed on the inner side surface 23 can be used.

The shape of the groove provided on the inner surface 23 is shown in FIG.
As shown in the figure, triangular grooves (a), U grooves (b), square grooves (c),
A variety of shapes are adopted, such as a groove with a slope at the corner of the square groove (d), a groove with a deep bottom center (e), a groove with a wide width (f), and a groove with multiple steps (g). it can. The grooves provided on the outer side surface 22 and the outer peripheral surface 29 are similarly formed in various shapes. Also, a groove formed by combining them can be formed. Further, a step 29 a (FIG. 8) may be provided on the outer peripheral surface 29 of the flange 20, and the step 29 a may be engaged with the spigot portion 11 formed on the inner peripheral surface 13 of the roll 10. In this case, the spigot portion 11 and the flange 20 fitted into the spigot portion 11
Since the processing length of the outer peripheral surface 29 can be reduced, the processing time can be reduced. In addition, since the fitting length is short, assembly can be performed in a short time. Further, a step 29a (FIG. 8)
It is also possible to make c) longer, and a gravure printing roll that is lightweight and has high strength can be manufactured. The grooves and recesses are effective not only for improving the heat balance, but also for reducing the weight of the flange 20, which is effective for reducing the weight of the gravure printing roll. Above all, except for the vicinity of the outer peripheral surface 29, the concave portion 25 and the wide groove which make the flange 20 substantially thin have a great effect of reducing the weight.

The heat balance between the roll 10 and the flange 20 is also improved by high-speed welding. The inventors of the present invention disclosed in Japanese Patent Application Laid-Open No. 8-197225 high-speed welding of aluminum materials.
The welding method introduced in the official gazette, the welding speed is 2-7m
When performing TIG or MIG welding at a high setting of / min, deformation and distortion due to welding are suppressed, and a weld bead having a good appearance and a narrow width is formed. Due to the high-speed welding with increased energy density, the roll 10 and the flange 20 are locally heated for a short time, and the total heat input is reduced, so that the heat balance between the roll 10 and the flange 20 is improved. As a result, distortion of the roll 10 that tends to occur after welding is suppressed.

In the present high-speed welding, the roll 10 and the flange 20 are welded at a welding current of 200 to 400 A and a welding voltage of 19 to 30 V using MIG welding or the like having a high energy density. During welding, the weld is shielded with an inert gas as necessary. By employing such welding conditions, the welding speed can be increased to 2 to 7 m / min, and a welded portion W without welding distortion is formed. By setting the welding speed to 2 m / min or more, the welded portion W is formed before heat input is diffused into the flange 20 by heat transfer.
The distortion occurring at zero is also reduced. However, at a welding speed exceeding 7 m / min, the welding conditions become unstable, and a sound welded portion W cannot be obtained.

When high-speed welding is combined with reducing the effective heat capacity of the flange 20 by forming grooves or recesses, the occurrence of welding distortion is further suppressed, and a sound weld W is formed. In accordance with the present invention, a flange 20 is
Is welded, the welded portion W is located inside the roll 10 and does not face the side surface, so that the Cu plating layer 31 is affected by blowholes, pinholes, and the like, which are likely to occur in the welded portion W.
No irregularities are generated on the surface of the substrate. Therefore, the thick Cu plating layer 32 formed on the Cu plating layer 31
Without being mechanically engaged with the u-plated layer 31, it is easily peeled off from the Cu-plated layer 31 when the printing surface is updated. Also,
Since the welded portion W in which the welding distortion is suppressed is formed, the surface grinding of the roll 10 is reduced or omitted after welding, and a gravure printing roll which sufficiently satisfies the required characteristics even when the roll 10 is thinned can be obtained.

[0018]

EXAMPLE 1 An aluminum alloy extruded pipe (6063-T5 material) having a diameter of 194 mm, a circumference of 609 mm, and a wall thickness of 7 mm was used as the roll 10. As the flange 20, a disk having a diameter of 180 mm and a thickness of 20 mm was cut out from an aluminum DC casting, and a rotary shaft mounting hole 21 having a tapered central portion was opened. The inner surface of the end of the roll 10 is cut and processed to have an axial length of 20 mm and a step of 1.5 mm
Was formed. Inner surface 2 of flange 20
3, a groove width of 5 m at a position 8 mm away from the outer peripheral surface 29.
m, a continuous groove 24 having a groove depth of 5 mm was formed. Flange 2
0 was fitted into the spigot portion 11 of the roll 10, and welding was performed at a welding current of 200A, a welding voltage of 23V, and a welding speed of 0.6m / min. When the shape of the roll 10 was measured after welding,
The roundness was 0.05 mm and the straightness was 0.1 mm / m, and the deformation due to welding distortion was very small. Therefore, 0.
After adjusting the outer peripheral surface 12 of the roll 10 with a surface cutting amount of 25 mm, the roll 10 could be sent to the next Cu plating layer 31 forming step (FIG. 1e).

Outer peripheral surface 12 of roll 10 and flange 20
The Cu plating layer 31 formed on the outer surface 22 has a smooth surface without irregularities. A thick Cu plating layer 32 having a thickness of 80 to 100 μm is formed on the Cu plating layer 31, and a concave portion 33 for gravure printing is formed on the thick Cu plating layer 32.
, And then plated with Cr. The obtained gravure printing roll R was immersed in the ink I stored in the ink pan P as shown in FIG. While continuously feeding the printing sheet S between the gravure printing roll R and the pressing roll B, the gravure printing roll R is rotated clockwise to lift up the ink I, and the excess ink I
Was adhered to the printing sheet S while being scraped off by the scraper K. Observation of the print pattern applied to the printing sheet S revealed that the pattern of the concave portion 33 applied to the gravure print roll R was accurately transferred, and the print finish was uniform in the width direction. When the printing surface was updated, the thick Cu plating layer 32 could be easily peeled off because there was no mechanical engagement with the Cu plating layer 31.

For comparison, the same flange 20 was used except that the continuous groove 24 was not provided, and was welded to the roll 10 under the same conditions. In the roll 10 and the flange 20 after welding, the flange 20 was not melted due to insufficient heat input and could not be joined.

[0021]

Embodiment 2 The same roll 10 and flange 2 as in Embodiment 1
0 and the flange 2 on the spigot part 11 of the roll 10
0 was inserted, and high-speed welding was performed at a welding current of 310 A, a welding voltage of 26 V, and a welding speed of 3 m / min. When the shape of the roll 10 was measured after welding, the roundness was 0.02 mm and the straightness was 0.04 mm / m, and the deformation caused by welding distortion was very small. Therefore, after adjusting the outer peripheral surface 12 of the roll 10 with a surface cutting amount of 0.1 mm, the next Cu plating layer 3
1 (FIG. 1e). For comparison, the welding speed was set to a normal speed of 0.6 m / min, and the flange 20 was welded to the roll 10. Roll 10 after welding
Has a roundness of 0.4 mm and a straightness of 1 mm / m, and the outer peripheral surface 12 of the roll 10 is corrected to a perfect circle and a straight line. And it was.

[0022]

As described above, in the gravure printing roll of the present invention, since the welded portion for joining the inner peripheral surface and the flange is provided inside the roll, the welded portion is provided at both ends of the roll. Unlike this, the Cu plating layer formed on the outer peripheral surface of the roll and the outer surface of the flange is not roughened by the influence of the welded portion. Therefore, Cu
On the plating layer, a printing thick film Cu plating layer that can be easily peeled off when the printing surface is updated is formed. In addition, when welding a flange to a roll in a state where the heat balance between the roll and the flange is improved, welding distortion, which is likely to occur due to heat input during welding, is suppressed, and surface cutting of the roll after welding is reduced or omitted. You. Therefore, a thin roll can be used,
Combined with the lightweight aluminum, the handleability of the gravure printing roll where the roll is frequently changed is improved.

[Brief description of the drawings]

FIG. 1 is a manufacturing process diagram of a gravure printing roll

FIG. 2 is a partial cross-sectional view showing a state in which a weld is taken inside the roll and a flange is welded to the inner peripheral surface of the roll according to the present invention.

FIG. 3 is a partial cross-sectional view of a gravure printing roll obtained by welding a flange having a continuous groove formed on an inner surface near a welded portion to the roll, and a perspective view of the flange.

FIG. 4 is a partial cross-sectional view of a gravure printing roll obtained by welding a flange having a concave portion to the roll according to the present invention (a) and a perspective view of the flange (b).

FIG. 5 shows an intermittent groove (a), an intermittent concave portion (b), and a plurality of continuous grooves or flanges (c) formed concentrically with an intermittent groove.

FIG. 6 shows a flange in which a single circumferential groove (a) and a plurality of circumferential grooves (b) are provided on the outer peripheral surface, and a flange (c) in which a circumferential groove on the outer peripheral surface is combined with a concave portion on the inner surface.

FIG. 7 is a sectional view showing various groove shapes.

FIG. 8 is a partial cross-sectional view of a gravure printing roll in which a flange (b) having a step on an outer peripheral surface is fitted into a spigot portion of the roll and welded;

FIG. 9 is a schematic diagram of a main part of a gravure printing apparatus.

[Explanation of symbols]

10: Roll 11: Inlay part 12: Outer peripheral surface 20: Flange 21: Rotating shaft mounting hole 22:
Outer surface 23: Inner surface 24: Continuous groove 25: Recess 26: Intermittent groove 2
7: intermittent recess 28: circumferential groove 29: outer peripheral surface 2
9a: Step formed on outer peripheral surface 31: Cu plating layer 32: Thick Cu plating layer 3
3: recess for ink pit

Continued on the front page (72) Inventor Kiyoshi Akiya 2-2-2, Higashi-Shinagawa, Shinagawa-ku, Tokyo Inside Nihon Light Metal Co., Ltd. (72) Inventor Keiichi Sato 2-2-2, Higashi-Shinagawa, Shinagawa-ku, Tokyo Japan Light Metal Co., Ltd. (56) References JP-A 62-13627 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41F 13/11 B23K 9/173 B23K 9/23 B41N 1 / 06

Claims (6)

(57) [Claims] 1. An aluminum roll having a spigot portion formed on both inner surfaces, and a flange fitted into the spigot portion, wherein a weld is provided between the inner surface of the flange and the inner surface of the aluminum roll . Of the flange
One or more concentric circles on the inner surface with the outer peripheral surface of the flange
A gravure printing roll in which a number of continuous or intermittent grooves are formed . 2. An aluminum plate having a spigot portion formed on both inner surfaces.
Minium roll and flan fitted in spigot
The inner surface of the flange and the aluminum roll
There is a weld between the inner surface of
The outer peripheral surface of the flange of the relevant flange on the outer peripheral surface near the welded part
One or more continuous or intermittent grooves from
A gravure printing roll that has been formed . 3. A step is formed on the outer peripheral surface of the flange, and the step is formed.
3. The roller according to claim 1, wherein said roller is engaged with a spigot portion of the roll.
Gravure printing roll according to. 4. A stepped recess from the vicinity of the welded portion
The gravure printing roll according to claim 1, which is formed on an inner surface of the nozzle . 5. A step is formed on both inner surfaces of an aluminum roll.
Form a spigot-shaped spigot with an inner surface near the weld
And / or flanges with grooves or recesses formed on the outer peripheral surface.
Insert the aluminum roll into the spigot,
Between both end faces of the aluminum roll and the inner face of the flange.
A method for producing a gravure printing roll in contact. 6. A stepped inlay portion is formed on the inner surface of both sides of an aluminum roll, and the inlay portion is formed of aluminum.
Flanges on both sides of the aluminum roll
Welding speed between end face and inner surface of flange
A method for producing a gravure printing roll , comprising welding at 7 m / min .