JPS61272145A - Photogravure process roll - Google Patents

Abstract

PURPOSE:To obtain a photogravure process roll ensuring the fitting of an end plate to a cylinder and being light in weight, by cutting off the opposite end portions of the cylinder made of an aluminum alloy so as to form end plate receiving portions therein. CONSTITUTION:A cylinder 1 is formed of an extruded form material of an Al-Mg-Si aluminum alloy which has an outer wall 1a, an inner wall 1b and radial joint walls 1c joining these two walls. The respective opposite end portions of the inner wall 1b and the joint walls 1c are cut off to form end plate receiving portions 4 therein. End plates 3 with tapered holes 2 for joining a rotary shaft are received thereby and fixed on the inner surfaces of the opposite ends of the outer wall 1a. The weight of this process roll is about 1/3 of an iron one, and thus an operation of replacing the roll can be performed by one person. Moreover the cylinder is excellent in the adhesion to a copper plating layer and thus quite free from corrosion. Furthermore, the end plates 3 can be positioned easily with respect to the cylinder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Application This invention relates to a plate-making roll for gravure printing.

In addition, in this specification, [iron j rFeJ shall include steel. Also, "%" is tfflml
・Semi-standard.

Prior Art and Its Problems Conventional plate-making rolls for gravure printing are made of steel, and the roll itself is very heavy. As a result, there were several problems as follows. Many types of rolls of this type are available with different diameters and/or lengths depending on the size of the printing target, and the required rolls are mounted on a stand and used, so the rolls are constantly being used. It was necessary to carry out replacement work, but this work could not be done by one person, which was inconvenient. Furthermore, the frame itself must be sturdy because it must support the heavy rolls, so it has to be expensive. Furthermore, since the rolls are heavy and have a large inertia, it is not easy to control the printing speed.

The purpose of this invention is to reduce the weight of the gravure to solve the above-mentioned problems, and to provide excellent adhesion to the copper plating layer formed on the surface, as well as to ensure the attachment of the end plate to the cylinder. Our objective is to provide printing plate-making rolls.

Means for Solving the Problems In order to achieve the above object, the plate-making roll for gravure printing according to the present invention has an outer wall, an inner wall spaced from the outer wall, and at least three radial connections connecting both walls. Both ends of the inner wall and the connecting wall are cut off, and an end plate receiving part is formed by the cut-off end surfaces of both walls. An end plate with a tapered hole for connecting a rotating shaft is received by the end plate, and is fixed to the inner surface of both ends of the outer wall.

Function: Since at least the cylinder of the plate-making roll according to the present invention is made of aluminum alloy, one part of the plate-making roll is made of aluminum alloy.
It weighs about 73 centimeters and is far less susceptible to corrosion than iron.

In addition, when applying copper plating to the surface of the cylinder, the surface is roughened by etching to improve adhesion with the plating layer, but the cylinder is made of A/-MO-8i series aluminum alloy. Therefore, it has better etching properties than pure aluminum, aluminum alloys other than those mentioned above, and iron. In the A/-Mg-8i series aluminum alloy, the Mg content is 0.
2 to 2%, and the Si content is preferably 0°1 to 2%,
Moreover, if it is less than the lower limit, the strength will be insufficient, and if it exceeds the upper limit, it will be difficult to extrude using a boathole die.

Since the cylinder has an outer wall, an inner wall spaced from the outer wall, and at least three radial connecting walls connecting both walls, it has the necessary structural strength as a cylinder.

In addition, both ends of the inner wall and the connecting wall are cut off to form an end plate receiving part consisting of the cut-out end surfaces of both walls, so the position of the end plate with a tapered hole for connecting the rotating shaft to the cylinder is determined. be able to.

Further, since the end plate is received by the receiving portion and fixed to the inner surface of both ends of the outer wall, there is no problem even if the cone end of the rotating shaft is press-fitted into the tapered hole of the end plate.

The cone ends of a pair of rotating shafts are press-fitted and keyed into the tapered holes of the end plates fixed to the inner surfaces of both ends of the cylinder each time the rolls are replaced, so repeated attachment and detachment of the rotating shafts will cause the taper to deteriorate. Since it is required that the inner peripheral surface of the hole does not wear out, the end plate is made of Fe, A/-MQ base aluminum 2.
9 alloy, A/-Si-based aluminum alloy or A/-8
It is preferable to use a material made of a metal that has good wear resistance, such as an i-Cu-based aluminum alloy.

Example Embodiments of the invention will be described below with reference to the drawings.

Example 1 The plate-making roll for gravure printing shown in FIG. ) with four radial connecting walls (1c) connecting A/-
The end plate receiving part (made of extruded Ma-8i aluminum alloy material) is formed by cutting off both ends of the inner wall (1b) and the connecting wall (1c), and forming the end face of both walls (1b) and (1c) after cutting. 4) is formed, and the end plate (3) with the tapered hole (2) for connecting the rotating shaft is received therein, and the outer wall (1a
) is fixed to the inner surface of both ends.

The diameter of the small diameter portion of the tapered hole (2) and the inner diameter of the inner wall (1b) are approximately equal.

Since the end plate (3) is made of Fe, it is fixed to the cylinder (1) by the following means. That is,
An adhesive layer (5) is interposed between the outer peripheral surface of the circular end plate (3) and the inner peripheral surface of the opposite end of the cylinder (1), and the cylinder (1) is shrink-fitted to the end plate (3). It will be done.

Note that the adhesive is applied to the end plate (3) side in advance. The cylinder (1) was extruded using a boathole die to prevent uneven thickness, and the end plate (3) was made in m.

When the plate-making roll is used, the cone ends (7) of the pair of rotating shafts (6) are press-fitted into the tapered holes (2) of both end plates (3).

A key groove (8) is provided on the inner peripheral surface of the tapered hole (2), and a key (9) to be fitted into the outer peripheral surface of the cone end (A) is provided.

In the case of this embodiment, the cylinder (1) is made of aluminum alloy and the end plate (3) is made of iron, and if they are in direct contact with each other, there would be a problem of electrolytic corrosion, but due to the interposition of the adhesive layer (5), I don't have this problem.

Example 2 The plate-making roll shown in Fig. 2 has a cylinder (1)
is made of aluminum alloy (A6NO1) of Al-0.65%Mg-0.54%S1, and the end plate (13) is made of cast metal.
is made of an aluminum alloy of Al-2, 5% MO.

The end plate (13) is fixed to the cylinder (1) by welding the entire circumference.

The diameter of the small diameter portion of the tapered hole (12) is made smaller than the inner diameter of the inner wall (1b).

The rest is the same as in Example 1.

In addition to the methods described in the above two embodiments, the end plate may be provided with male and female screws in the fitting portion to prevent heat from being attached to the cylinder, or may be press-fitted. Furthermore, the use of an adhesive during shrink fitting in Example 1 can be omitted.

Effects of the Invention The plate-making roll for gravure printing according to the present invention has the above-mentioned configuration, so it is different from the conventional iron one.
Since the weight is approximately 1/3, it is convenient for one person to perform roll replacement work.

Furthermore, the roll frame does not need to be as sturdy as in the past, so it can be manufactured at a low cost. Furthermore, since the roll is lighter and has less inertia, it is easier to control the printing speed.

Furthermore, since the cylinder is made of an A/-MO-Si aluminum alloy, it has good adhesion to the copper plating layer and is less susceptible to corrosion than iron.

Since the cylinder has an outer wall, an inner wall spaced from the outer wall, and at least three radial connecting walls connecting both walls, it has structural strength necessary for a cylinder.
Can be used in place of steel cylinders.

In addition, both ends of the inner wall and the connecting wall are cut off to form an end plate receiving part made of the cut-off end surfaces of both walls, making it easy to position the end plate with a tapered hole for connecting the rotating shaft to the cylinder. It is.

Roughly speaking, since the end plate is received by the receiving part and fixed to the inner surface of both ends of the outer wall, there is no problem even if the cone end of the rotating shaft is press-fitted into the tapered hole of the end plate, and the above-mentioned Combined with the ease of positioning, the end plate can be securely attached to the cylinder.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention, FIG. 2 is an enlarged sectional view taken along the line ■-■ in FIG. 1, and FIG. 3 is a partial longitudinal sectional view showing a second embodiment. . (1)...Cylinder, (1a)...Outer wall, (1b
)...Inner wall, (1c)...Connecting wall, (2) (12
)... Taper hole, (3) (13)... End plate, (4)
...End plate receiving part. 4 people other than above

Claims (1)

[Scope of Claims] A cylinder (1) includes an outer wall (1a), an inner wall (1b) spaced from the outer wall (1a), and both walls (1a).
) (1b) at least three radial connecting walls (
1c) made of an extruded Al-Mg-Si aluminum alloy material having an inner wall (1b) and a connecting wall (1c).
Both ends of the wall (1b) and (1c) are cut off to form an end plate receiving part (4) consisting of the cut-off end faces of the walls (1b) and (1c), and the ends with the tapered holes (2) and (12) for connecting the rotating shaft are cut off. A plate-making roll for gravure printing in which the plates (3) and (13) are received and fixed to the inner surfaces of both ends of the outer wall (1a).