JP4775424B2 - Can barrel processing method - Google Patents

Description

  The present invention provides, for example, a can body that can reliably perform the alignment even when the embossing is performed at a high speed when the embossing is performed by aligning with a pattern attached to the outer peripheral surface of the can body. It relates to the processing method.

  2. Description of the Related Art In recent years, a can body in which a concave portion and / or a convex portion of a can body is processed has been developed and commercialized due to reasons such as diversity of design and improvement of the strength of the can body as the thickness of the can body becomes thinner. In this case, when the concave and / or convex portions are processed in accordance with the patterns, characters, etc. (in the present specification, these are collectively referred to as patterns) printed on the can body constituting the can body, Since the design of the body is improved, at least a part of the pattern is processed with a recess and / or a protrusion that matches the pattern.

As a prior art for processing such recesses and / or protrusions on the can body, in order to align the forming means for processing the recesses and / or protrusions on the pattern portion of the can body, It is known that a positioning mark indicating a position is formed, this mark is read by a sensor, and the rotation of the can body is controlled so that the pattern comes to a position corresponding to the forming means (Patent Document 1 and Patent Document 2). reference).
Moreover, in order to reduce the manufacturing cost of a can, the rotary-type apparatus and method which perform an uneven | corrugated process at high speed are disclosed by patent document 3, for example.

WO 98/03279 Publication (“TOOLING AND METHOD THE EMBOSSING OF A CONTAINER AND THE RESULTING CONTAINER”) WO 97/21505 (“METHOD OF ORIENTING CANS”) WO98 / 03280 Publication

  In addition, the applicant of the present application reliably forms a pattern portion to be processed for the concave portion and / or the convex portion even when dirt or dust adheres to the can barrel or even a can barrel having a welded portion. As a technique that can be positioned at a position corresponding to the means, a can body is proposed in which two or more positioning marks for positioning the pattern at a predetermined position are formed on the outer peripheral surface of the can body (patent) Reference 4).

JP 2001-9547 A

FIG. 8 is a perspective view of the can described in Patent Document 4.
A can body 10 shown in FIG. 8 is a so-called two-piece can in which a bottomed cylindrical can body 11 is a main component, and a can lid 12 is attached to an opening after filling the contents. The can body 11 is formed by drawing and ironing a thin metal plate. On the outer peripheral surface of the can body 11, a pattern (character) 15 “CAN” is printed. This pattern 15 is printed on the outer peripheral surface of the can body 11 and then covered with an organic film such as a coating film. In addition, the polyester is printed on the back surface (the side in contact with the outer peripheral surface of the can body 11). It can also be formed by covering the can body with a film.

The can body 11 is formed with a recess “CAN” in a state of being aligned with the pattern 15.
In order to perform the molding process by making the pattern 15 and the concave portion coincide with each other, it is necessary to accurately align the molding means for processing the concave portion with respect to the pattern 15. A positioning mark 17 is necessary for this alignment. In the present embodiment, the positioning mark 17 has two marks, a stop mark (positioning stop mark) 17a and a confirmation mark (positioning confirmation mark) 17b, and the stop mark 17a and the confirmation mark The mark 17b is formed on the same circumference of the can body. Further, the stop mark 17a is longer than the confirmation mark 17b.

  The can body 11 introduced into the embossing apparatus detects a positioning mark 17 formed on the can body 11 by two sensors arranged in each pocket. One sensor detects the stop mark 17a of the can body 11, and rotates the can body 11 to stop so that the pattern 15 faces a predetermined position (a position that matches the uneven portion of the mold). Next, the other sensor detects the confirmation mark 17b and determines whether or not the pattern faces a predetermined position.

Positioning by the above two sensors is performed by the following procedure.
FIGS. 9A and 9B are diagrams for explaining the positioning procedure. FIG. 9A is a graph showing a change in the rotational speed of the can body 11, and FIG. FIG.
As shown in FIG. 9, when the can body is introduced into the embossing process, the stepping motor starts to drive and the rotation speed is set to V1. Then, until the positioning sensor 151 detects the stop mark 17a (see symbol I in FIG. 9), it is rotated at the rotation speed V1 by the stepping motor. When the positioning sensor 151 detects the stop mark 17a, the stepping motor is decelerated, and when the stop mark 17a passes the positioning sensor 151, the stepping motor is stopped (see II).

After the stepping motor is stopped, for example, the state is stopped for 10 msec, and the stepping motor is reversed at a low speed (see III). When the positioning sensor 151 detects the mark of the stop mark 17a, the stepping motor is stopped ( See IV). This completes positioning.
Thereafter, an inner roller is inserted into the can body 11, and the outer peripheral surface of the can body 11 is embossed while the can body 11 is mechanically rotated by the planetary gear mechanism in synchronization with the rotation of the turret.

However, it is necessary to further improve the production speed of the embossing machine due to the demand for cost reduction of embossing by the embossing apparatus.
In addition, in a can body whose surface is coated with a coating film such as a polyester film or an organic coating, when embossing is performed, a die for embossing comes into contact with the surface of the can body. There is a problem that defects such as whitening and peeling are likely to occur. Such problems tend to become more prominent as the embossing production rate increases.

  The present invention has been made in view of the above problems. In producing a can body having a can body and a can bottom provided on one side of the can body, the can body can be manufactured even if the production speed is increased. It is an object of the present invention to provide a method for processing a can body that can reliably perform the rotational positioning.

In order to achieve the above object, the inventor of the present invention reviewed conventional processes such as embossing.
In other words, the positioning of the can body during embossing or the like is conventionally performed by decelerating the rotation of the can body, once stopping the can body, and then reversing the can body. Positioning can now be performed without reverse rotation only by deceleration.

  Therefore, the can barrel processing method according to the present invention is a can barrel processing method for performing predetermined processing on the can barrel having a can barrel and a can bottom provided on one of the can barrels. The can barrel is provided with a stop mark on the downstream side in the rotational direction and a confirmation mark on the upstream side in the rotational direction as positioning marks, and confirmed on the upstream side in the rotational direction of the can barrel in the positioning step for rotational positioning of the can barrel. When the stop sensor detects the stop mark, the stop sensor is provided on the downstream side, the rotation of the can body is decelerated when the check sensor detects the stop mark, and the stop sensor detects the stop mark. Whether or not the can body is correctly positioned by rotation depending on whether or not the confirmation sensor detects the confirmation mark when the can body is stopped and the rotation of the can body is stopped. It is as a method of judging.

Thus, precise rotation positioning becomes possible by using two sensors and two marks. For this reason, even if the production speed is increased, the rotational positioning of the can body can be reliably performed.
The above-described processing method of the present invention can be applied to other processes of embossing, for example, bulge processing for performing overhang processing, but at least a part of the pattern attached to the outer peripheral surface of the can body has the pattern and The effect is great by applying to the embossing which aligns and forms a recessed part and / or a convex part.
That is, the processing method of the present invention is particularly effective in embossing in which unevenness processing is performed by aligning with the pattern of the can body, and even if embossing is performed at high speed, the pattern and the unevenness processing can be matched. .

In addition, in order to be able to produce a high-quality embossed can body at high speed without causing peeling, whitening, and cracks in the embossed pattern, the can barrel processing method according to the present invention includes It is good also as the method of providing the heating process which heats the said can body to predetermined temperature before the process process which performs a predetermined process to a can body.
In this case, in the case where the heating in the heating step is performed by a heating means disposed outside or inside the holding portion that holds the can body, the can body is rotated at least within a heating region by the heating means. It is preferable to heat while feeding while rotating at a speed.
Further, the can body may be rotated at least three times within the heating region. In addition, as the heating, it is preferable to use high-frequency heating that can heat the can body to a predetermined temperature in a short time.

  According to the present invention, the rotational positioning of the can body can be reliably performed even when the production speed is increased.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
First, the configuration of the main part of a processing apparatus suitable for carrying out the present invention will be described with reference to FIG.
In the following description, an embossing apparatus that performs embossing on a can body will be described as an example of the processing apparatus. However, the present invention is also applicable to, for example, a bulge processing apparatus that performs overhang processing on a can body. Is possible.

FIG. 1 is a schematic diagram illustrating an example of an embossing apparatus and explaining a configuration of a main part thereof.
The embossing device 1 includes a base 2, a heating unit 4 that is provided on the base 2 and performs high-frequency heating of the can body 11, and a can body that is provided on the base 2 and heated by the heating unit 4. The embossing part 6 which embosses 11 is used as a main component.

  A can body supply unit 3 for supplying the can body 11 conveyed from the previous process to the heating unit 4 is provided on the upstream side of the heating unit 4, and an embossing unit 6 is provided on the downstream side of the embossing unit 6. A can body unloading portion 7 is provided for unloading the can body 11 that has been embossed. Further, between the heating unit 4 and the embossing unit 6, a can body transfer unit 5 for transferring the heated can body 11 from the heating unit 4 to the embossing unit 6 is provided.

As shown in FIG. 8, the can body 11 processed by the embossing apparatus 1 has two positioning marks, a stop mark 17a for positioning and a confirmation mark 17b, provided on the same circumference. It has been. The stop mark 17a is formed longer in the circumferential direction than the confirmation mark 17b, and is provided on the downstream side in the rotation direction of the can body 11 with respect to the confirmation mark 17b. In this way, if the lengths of the stop mark 17a and the confirmation mark 17b are made different, there is an advantage that misidentification of the mark can be prevented.
In addition, it is preferable that these positioning marks are formed by printing simultaneously with the pattern without requiring a new process.
Hereinafter, each part will be described in detail.

[Embossed part]
First, an embossing procedure in the embossing section 6 will be described with reference to FIG.
The basic configuration of the embossed portion 6 is the same as that disclosed in Japanese Patent Application Laid-Open No. 9-192863 by the applicant of the present application, and a detailed description thereof will be omitted.

From the position indicated by (1) in FIG. 2, the can body 11 is introduced into the embossing section 6 from the can body delivery section 5 (see FIG. 1). The can body 11 introduced into the embossing section 6 is connected to a station by a stop sensor 151 and a confirmation sensor 152 (other pockets are not shown) as positioning sensors arranged in each of 16 pockets. Between (1) and (4), the positioning mark 17 formed on the can body 11 is detected and positioned.
The stop sensor 151 detects the stop mark 17a of the can body 11, and the can body 11 is rotated so that the pattern 15 faces a predetermined position (a position that coincides with the uneven portion of the mold). Next, the confirmation sensor 152 detects the confirmation mark 17b and determines whether or not the pattern faces a predetermined position.

  Thereafter, with the position maintained, the can body 11 is fed to the position indicated by (5) in FIG. 2, and the inner roller 101 is inserted. Further, the cam member 140 is disposed outside the inner roller 101 over a range slightly wider than the range from (5) to (6). The cam member 140 presses the inner wall of the can body 11 on the side in contact with the outer roller 102 in the range of (5) to (6) by pressing the outer periphery of the can body 11 with a cam roller (not shown).

  Within the range of (5) to (6), the can body 11 is embossed while rotating the inner roller 101 and the outer roller 102. When the can body 11 is sent to the position (7) in FIG. 2, the cam roller 40 is not pressed by the cam member 40 and the inner roller 102 comes out of the can body 11. The can body 11 is carried out of the embossing apparatus at the position (10) in FIG. In this way, the recess 16 is processed in the pattern portion of the can body 11.

[Can barrel positioning]
As described above, the positioning of the can body 11 is performed while the can body 11 passes through the four stations (1) to (4).
During this time, the can body 11 is not inserted into the inner roller 101, and the can body 11 is rotated and positioned by a stepping motor provided corresponding to each pocket. The time allowed for this positioning becomes shorter as the production speed of the can increases. For example, if a production rate of 500 CPM (500 cans / minute) allows a time of 450 ms for positioning, increasing the production rate to 1500 CPM will also reduce this tolerance time to 150 ms.
Therefore, in the present invention, the conventional positioning procedure is reviewed so that positioning can be performed only by deceleration without performing the stand-by standby and reverse rotation as shown in FIG.

FIGS. 3A and 3B are diagrams for explaining a positioning procedure in this embodiment. FIG. 3A is a graph showing a change in the rotational speed of the can body, and FIG. It is a figure which shows the positional relationship of a sensor (stop sensor 151 and confirmation sensor 152) and a positioning mark (stop mark 17a and confirmation mark 17b).
As shown in the graph of FIG. 3A, simultaneously with the introduction of the can body 11 (time T = 0), the stepping motor starts driving, and at time T1, the rotation speed of the can body 11 reaches a predetermined rotation speed V1. Reach. The stepping motor rotates the can body 11 at the rotational speed V1 until the confirmation sensor 152 detects the stop mark 17a. At time T2 (see symbol I in FIG. 3) when the confirmation sensor 152 detects the stop mark 17a, the stepping motor starts decelerating (see II), and the time when the stop sensor 151 detects the stop mark 17a. At T3, the stepping motor is stopped (see the same III). This completes positioning.
The rotation speed V1 is determined by the production speed. For example, when the production speed is 1500 CPM (allowable time T3 = 150 ms in this case), it is necessary to set V1 = 500 min ⁻¹ . As shown in FIG. 3B, the confirmation sensor 152 is provided on the upstream side in the rotation direction of the can body, and the stop sensor 151 is provided on the downstream side in the rotation direction of the can body.

[Pre-positioning]
By the way, when the rotation speed of the can body 11 by the stepping motor becomes higher than a certain speed, the stepping motor does not stop even if the confirmation sensor 152 detects the stop mark 17a and outputs a drive deceleration / stop command to the stepping motor. There may be a problem in that the positioning accuracy at the time of stopping cannot be obtained due to vibration without being able to follow the deceleration command. On the other hand, if the rotational speed is decreased until the vibration is eliminated in order to obtain an accurate positioning state, the positioning operation of the can body 11 cannot be completed within the allowable time described above.
Therefore, in this embodiment, when the can body 11 is introduced into the station (1), a certain degree of alignment is performed in advance (this alignment is referred to as “pre-positioning” in this specification). In addition, the rotation amount of the can body 11 by the stepping motor is reduced so that the positioning operation can be completed with high accuracy even in a short time even at a low speed.

For example, production speed 1500 cpm, although the positioning speed 500min at ^-1 accurate is difficult, by reducing the rotational speed to 240 min ^-1, and what can reliably accurate positioning without vibration. However, at this rotational speed of 240 min ⁻¹ , T3 = 313 ms is required until positioning and stopping, and positioning cannot be performed within an allowable time of 150 ms. Therefore, by performing pre-positioning of the can body 11, the time for positioning and stopping can be shortened even at a low speed.
Table 1 below shows the relationship between the rotation range when the rotation speed is 240 min ⁻¹ and the positioning time.

As can be seen from this table, positioning and stopping can be performed within 125 ms by positioning the can body 11 in advance so that the stop mark 17a is positioned within a range of 90 ° with respect to the stop sensor 151. The allowable time for positioning at 1500 CPM can be satisfied within 150 ms.
In addition, although the above-mentioned pre-positioning can be performed in the can body delivery part 5 upstream of the embossing part 6, in this embodiment, it is performed in the heating part 4.
Hereinafter, the configuration of the heating unit will be described with reference to FIGS. 4 and 5.

[Heating section]
4 is a partially broken side view illustrating the configuration of each pocket, and FIG. 5 is a schematic plan view illustrating the entire configuration of the heating unit.
The heating unit 4 includes a pocket 41 that holds the can body 11 and a high-frequency coil 42 that heats the can body 11 held in the pocket 41.
As shown in FIG. 5, the high-frequency coil 42 is disposed outside the pocket 41 over the range of the stations (2) to (6).

As shown in FIG. 4, each of the pockets 41 that hold the can body 11 is attached to a common base 40, and rotates integrally with the base 41 by driving of a driving body such as a motor (not shown).
A stepping motor 43 is disposed at a position corresponding to each of the pockets 41 of the base 40 and is attached to the base 40 via an attachment member 46.

A chuck 44 that grips the can body 11 is connected to the rotation shaft 43 a of the stepping motor 43. When the stepping motor 43 is driven, the rotation of the rotation shaft 43 a is transmitted to the can body 11 through the chuck 44. Be able to.
The configuration of the chuck 44 is the same as that of the chuck provided in each pocket of the embossing section 6 and is well known, and therefore detailed description thereof is omitted here. Each pocket 41 is provided with a pre-positioning sensor 45 for detecting the stop mark 17a of the can body 11.

  As shown in FIG. 5, first, the can body 11 is received from the can body supply section 3 at the station (1), and the stepping motor is accelerated to a predetermined rotational speed at the station (1). Next, between the stations (2) to (6), the can body 11 is heated by the heating means. As the heating means, it is preferable to use a high-frequency coil 42 that can heat the metal can body 11 in a short time. In the high-frequency heating, when the can body 11 passes through the high-frequency coil, it is preferable to rotate the can body at least three times to uniformly heat the entire circumference of the can body 11.

The heating temperature varies depending on the type of film coated on the surface of the can body 11. For example, in the case of a polyester film, the temperature of the polyester film immediately before embossing in the embossed portion 6 is 80 ° C. to 90 ° C. Heat to such a temperature.
Pre-positioning is performed in the three stations (7) to (9) after the heating region of the stations (2) to (6) and before the can body 11 is transferred to the can body transfer section 5.

[Rotational speed during pre-positioning]
FIGS. 6A and 6B are diagrams for explaining the pre-positioning procedure in the heating unit of this embodiment. FIG. 6A is a graph showing a change in the rotational speed of the can body, and FIG. FIGS. 7A and 7B show the positional relationship between the pre-positioning sensor 45 and the positioning marks (the stop mark 17a and the confirmation mark 17b) in FIGS. It is a figure which shows the relationship between the positioning mark (stop mark 17a and the confirmation mark 17b) at the time of performing the rotational positioning of the cylinder 11, and the positioning sensor (stop sensor 151 and the confirmation sensor 152) provided for the positioning process.
In the heating unit 4 configured as described above, for example, when embossing the can body 11 at 1500 CPM, the time required for the can body 11 to pass through the heating region in which the high frequency coil 42 is provided is about 160 ms. Therefore, in order to rotate the can body 11 three times within this time, the can body must be rotated once in about 53 ms. This corresponds to a rotation speed of 1200 min ^{−1 in} the stepping motor 43.

Therefore, when the can body 11 is received by the heating unit 4, that is, at the time T = 0 in the graph of FIG. 6A, the stepping motor 43 of the station (1) is driven to enter the heating area ( At a time T1 until reaching 2), the can body 11 is set to a predetermined rotational speed (for example, the rotational speed of 1200 min ⁻¹ in the case of 1500 CPM).
In the heating area of the stations (2) to (6), this rotational speed is maintained, and when the pre-positioning sensor 45 detects the stop mark 17a of the can body 11 after the station (7) that has passed the heating area (time). At T2, (see symbol I in FIG. 6), the rotational speed of the can body 11 by the stepping motor 43 is reduced (see II).

At this time, deceleration control is performed so that the can body 11 stops before the can body 11 is discharged from the station (9). The position of the stop mark 17a when the can body 11 stops is the embossed portion. When starting the rotational positioning of the can body 11 delivered to 6, the control is performed so as to be within a predetermined angle α with respect to the stop sensor 151 in the embossing section 6 as shown in FIG. 7 (time T3). , See ibid.).
Note that the angle α is 90 ° in the example of positioning at 1500 CPM, 240 min ⁻¹ described above.

Although preferred embodiments of the present invention have been described, the present invention is not limited to the above-described embodiments.
For example, in the above description, a can body for a two-piece can whose main constituent element is a bottomed cylindrical can body has been described as an example, but the present invention attaches a can bottom to one of the can bodies. The present invention can also be applied to a three-piece can body.
When the present invention is applied to a can for a three-piece can, as proposed in Japanese Patent Application Laid-Open No. 2001-9547 by the applicant of the present application, both the confirmation mark 17b and the stop mark 17a are It is preferable to form it so as to be longer than the width of the welded portion of the trunk.

Further, although a stepping motor is described as an example for rotating the can body 11, other motors such as a servo motor and a motor with an encoder may be used if the rotation speed and the stop position can be controlled. Is also possible.
In the above description, embossing and bulging have been described as examples. However, the present invention can also be applied to other processes that require accurate rotational positioning of the can body.

  The present invention provides, for example, a can body that can reliably perform the alignment even when the embossing is performed at a high speed when the embossing is performed by aligning with a pattern attached to the outer peripheral surface of the can body. It can be widely used as a processing method.

It is a schematic diagram concerning an example of an embossing device and explaining composition of the principal part. It is explanatory drawing of the procedure which embosses a can body, and is a figure which shows the relationship between the inner roller of an embossing apparatus, an outer roller, and a can body. It is a figure explaining the procedure of positioning in this embodiment, (a) is a change graph of the rotational speed of the can body, (b) is a sensor and positioning marks at positions I, II, IV of the graph of (a) It is a figure which shows these positional relationships. It is a partially broken side view explaining the structure of each pocket. It is a schematic plan view explaining the whole structure of a heating part. It is a figure explaining the procedure of the pre-positioning in a heating part. It is a figure which shows the relationship between the positioning mark and sensor at the time of performing pre-positioning. It is a perspective view of the can described in patent documents 4. It is a figure explaining the procedure of positioning by two sensors.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Embossing apparatus 2 Base 3 Can body supply apparatus 4 Heating part 5 Can body delivery part 6 Embossing part 7 Can body carrying-out part 10 Can body 11 Can body 17a Stop mark 17b Confirmation mark 45 Sensor 151 Sensor 152 Sensor

Claims (3)

In the method of processing a can body that performs a predetermined process on the can body of the can body having a can body and a can bottom provided on one side of the can body,
The can barrel is provided with a stop mark on the downstream side in the rotation direction as a positioning mark, and a confirmation mark on the upstream side in the rotation direction,
A sensor for confirmation is provided on the upstream side in the rotational direction of the can body in the positioning step for rotationally positioning the can body, and a stop sensor is provided on the downstream side,
When the confirmation sensor detects the stop mark, the rotation of the can body is decelerated. When the stop sensor detects the stop mark, the can body is stopped, and the can body rotates. When the can is stopped, it is determined whether or not the can barrel is accurately rotationally positioned based on whether or not the confirmation sensor detects the confirmation mark. .   The predetermined processing applied to the can body is embossing in which at least a part of the pattern provided on the outer peripheral surface of the can body is aligned with the pattern to form a concave portion and / or a convex portion. The method for processing a can body according to claim 1.   3. The can body according to claim 1, wherein a heating step of heating the can body to a predetermined temperature is provided before the processing step of performing a predetermined process on the can body. Processing method.

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