JPH0729161B2 - Heating device for the mouth of seamless cans - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention heats a work-hardened mouth end of a seamless can body such as a draw can body, a draw-ironing can body, and an impact extrusion processed can body. The present invention relates to a heating device for a mouth end portion of a seamless can for softening and facilitating post-processing such as flange processing, bead processing, or necking processing for the mouth end portion.

(Prior Art) In a seamless can body such as a squeezing-ironing can body, the body part of the forming process stretches in the axial direction, and a fibrous structure extending in the axial direction develops in the body part. This fibrous tissue develops more as it approaches the mouth end of the trunk. Therefore, cracks are likely to occur during post-processing such as flange processing, bead processing, or necking processing at the mouth end.

As a countermeasure against this, prior to post-processing, a high-frequency induction heating coil is arranged so as to surround the mouth end,
A device for locally heating and softening the mouth end to relax the fibrous structure has been proposed (Japanese Patent Publication No. 59-45733).

In this conventional device, after placing a seamless can on a supporting disc, the supporting disc is lifted, the mouth end of the can is inserted into an annular high-frequency induction heating coil, and then the supporting disc. Intermittently by rotating the plate and simultaneously or subsequently energizing the heating coil, deactivating the heating coil after the required time (for example, 2 seconds), stopping the rotation at the same time, and lowering the supporting disc. There was a typical heating device.

(Problems to be Solved by the Invention) As described above, since the conventional heating device is operated by the intermittent operation, a relatively large amount of time is required for the pre-stage and the post-stage in addition to the time for actual heating. There was a problem of low productivity.

Further, since the heating coil is energized after the mouth end of the can body is inserted into the heating coil, the heating time is relatively long (for example, 2 seconds). Therefore, if the can body is made of a metal with a relatively high thermal conductivity, such as aluminum (hereinafter referred to as aluminum including aluminum alloys), the body part below the mouth end to be post-processed is also affected by heat conduction. The temperature rises and softens, so that during the post-processing, the softened body portion is apt to undergo buckling deformation. In order to prevent this, it is necessary to provide a cooler below the high-frequency induction heating coil to prevent the temperature rise of the body portion below the mouth end, which causes a problem of complicated work.

The present invention is capable of continuously heating the mouth end portion of the seamless can body, and in a very short time, to uniformly heat and soften it in the circumferential direction,
An object of the present invention is to provide a heating device for the mouth end of a seamless can.

(Means for Solving the Problem) The heating device for the mouth end portion of the seamless can body of the present invention is held by a plurality of seamless can body holders provided along the peripheral portion of the turret, and a holder. A high-frequency induction heating coil device having arc-shaped conductors facing each other, which are arranged along a part of the transition path of the mouth end of the seamless can body so as to sandwich the mouth end and close to the mouth end. , And a fixed cam, the holder has a vacuum suction hole for vacuum-sucking the bottom portion of the seamless can body, and has a central axis at a fixed position in the axial direction; slidable in the axial direction along the central axis, And a rotating body that is rotatable with the central shaft and has a gripping body that grips the lower end of the body of the seamless can at the tip;
The turret is provided with a support member having a cam follower for sliding along a guide member fixed to the turret, and the cam follower engages with a fixed cam to reciprocate in the axial direction as the turret rotates. It is characterized by becoming.

(Operation) In the device of the present invention, since the holder for the seamless can is provided along the peripheral portion of the turret, the holder can revolve.

Since the holder has a central shaft that has a vacuum suction hole for vacuum-sucking the bottom of the can body and is fixed in the axial direction, the bottom face of the can body is axially moved by the opening surface of the vacuum suction hole of the central shaft. Can be held in place. Further, it is provided with a rotating body having a grasping body for grasping the lower end of the body of the can body at the tip, and the support body which rotatably supports this rotating body is reciprocally movable in the axial direction. After vacuum-adsorbing the bottom of the body, by advancing the rotating body together with the support, the lower end of the body of the can can be grasped by the grasping body. At least the mouth end portion can be held while passing between the arc-shaped conductors so that the shaft does not shake even when rotated.

The support has a cam follower, which engages with a fixed cam and is capable of reciprocating in the axial direction as the turret rotates. Therefore, when the can body is received in the turret and when it is delivered from the turret, the support body, that is, the gripping body of the rotating body is in the retracted position, and the bottom portion of the can body is vacuum-held and held by the central shaft, or the vacuum is held. Can be released to prevent it from being delivered from the turret.

The arc-shaped conductors of the high-frequency induction heating coil device, which are opposed to each other, are arranged along a part of the transition path of the mouth end portion of the can body, and are arranged at a position close to the mouth end portion. Since the vicinity of the bottom is rotatable by being held by the central shaft and the gripping body of the rotating body that can rotate together with the central shaft, the mouth end moves between the conductors while rotating and continues for a very short time. It can be heat-softened uniformly in the circumferential direction.

(Embodiment) In FIG. 1, reference numeral 1 is a vertical chute for conveying and delivering a seamless can body 2 such as a drawn-ironing can body made of aluminum, for example, and a gate 3 is provided at the lower end thereof. Reference numeral 4 is a feed turret, 5 is a heating turret, and 6 is a delivery turret. The feeding turret 4 has a plurality of (six in the figure) can body holding pockets 4a at equal intervals along the peripheral edge thereof, and holds the can body 2 received from the chute 1 between the guide 4b and the arrow A. In the feeding station P, the turret 5 for heating is rotated continuously.
Send to.

The heating turret 5 is provided with a plurality of (12 in the figure) can body holding devices 7 at equal intervals along the peripheral edge and continuously rotates in the direction of arrow B. At a position substantially facing the feeding turret 4, there are opposing arc-shaped conductors 9a, 9b arranged at a position close to the mouth end 2a of the moving can body 2, and are constantly energized during work. The high frequency induction heating coil device 8 is provided.

The delivery turret 6 is provided on the downstream side of the high-frequency induction heating coil device 8 and is provided with a plurality of (six in the figure) can body holding pockets 6a at equal intervals along the peripheral portion thereof. The delivery turret 6 receives the heated can body 2 from the heating turret 5 in the delivery station Q, rotates in the direction of the arrow C while holding it between the guide 6b, and then in the delivery station R, ejects the can body 2. Discharge to 10.

The can body holding device 7 provided on the heating turret 5 is provided so as to face the holder 12 for holding the vicinity of the bottom of the can body 2 and the holder 12, and the mouth end 2a of the can body 2 It is provided with a support tool 13 (supports for a period except when the mouth end 2a is passing through the high frequency induction heating coil device 8) (Fig. 5 (a)).
reference).

As shown in FIGS. 2, 3, and 4, the holder 12 includes a central shaft 15 having a vacuum suction hole 16 and a linear stroke bearing 18.
The central axis 15 is rotatably supported by the rotator 17, which is slidable in the axial direction along the central axis 15 and rotatable with the central axis 15, and the support 20 which rotatably supports the rotator 17 by the ball bearings 19.
Is equipped with. The support 20 is slidably disposed along a guide pin 21 fixed to the turret board 5b of the turret 5 and extending in the axial direction of a horizontal turret shaft 5a.

The central shaft 15 has an opening 16a for a vacuum suction hole 16 and has a disc 23, a main body 15a, and a linear stroke bearing 18 for vacuum-sucking the bottom 2b (FIG. 5 (a)) of the can body 2 on the front surface. , Rotating body 17
It mainly consists of a collar portion 24 provided at the rear of the and a hemispherical contactor 22 formed on the rear surface of the collar portion 24.

The rotating body 17 has a holding body 25 having a hole portion 25a having an inner diameter for allowing the body lower end portion 2c to be loosely inserted, for grasping the body lower end portion 2c (Fig. 5 (b)) of the can body 2. It mainly comprises a shaft body 26 for fixing the grip body 25 at the front end, a brake disc 27, a pulley 28 for rotating the shaft body 26, and a cap 29 screwed to the rear end of the shaft body 26. In addition, reference numerals 30 and 31 are keys.

A pressing spring 32 is provided between the cap 29 and the collar 24, and the top 22a of the contact 22 is always fixed (when the rotating body 17 reciprocates in the axial direction) to the turret board 5b. The bolt 33 is in pressure contact with the flat front surface of the bolt 33, so that the central shaft 15 is always in axial position. Further, the screwdriver of the bolt 33 can adjust the axial position of the central shaft 14.

The support 20 includes a main body 20a, a front cap 34 and a rear cap fixed to the front and rear surfaces of the main body 20a, respectively.
35, a can body receiver 36 fixed to the front cap 34 via a bolt 36a, a sliding hole 37 for the guide pin 21, and a main body
It is mainly composed of a roller cam follower 38 attached to the lower end of 20a.

A cylindrical void 39 connected to the vacuum suction hole 16 is formed between the main body 15a of the central shaft 15 and the shaft 26 of the rotating body 17. In the space 39, the shaft 26 is radially penetrated,
A disk-shaped vacuum hole 40 extending partway through the main body 20a of the support 20.
Are in communication. The vacuum hole 40 is connected to a vacuum valve (not shown) provided in the turret 5 through a conduit (not shown). 41 is a vacuum sealing device, 52, 53, 54
Is an O-ring for vacuum sealing. The vacuum valve is opened when the can body holding device 7, and thus the can body 2, reaches the G station shown in FIG. 1, and the vacuum suction hole 16 is in communication with a vacuum source (not shown), and closed when the station H is reached. Is configured.

The belt 42 for rotating the pulley 28 is driven by a motor (not shown) provided outside the turret 5, and is arranged so as to engage with the pulley 28 at the I station and disengage from the pulley 28 at the K station. It is set up. Therefore, in combination with the operation of the kick-out roll described below, the section between the J station and the K station, that is, the can body 2 is passing through the inside of the high frequency induction heating coil device 8,
The pulley 28, and hence the can body 2, is designed to rotate at a constant speed. A kick-off roll (not shown) is provided coaxially with the drive roll (not shown) of the belt 42.
Just before the belt 42 engages the pulley 28 at the station, the roll contacts the pulley 28 to initially accelerate the pulley 28.

The disc brake 43 is fixed to the bracket 50 (see FIG. 3), and immediately after the belt 42 is disengaged from the pulley 28 at the K station, it is biased by an air mechanism (not shown) to engage with the brake disc 27. The rotation of the can body 2 is stopped.

The fixed plate cam 44 engages with the roller cam follower 38,
When the holder 12 reaches the G station (Fig. 1), the can body 2
Immediately after the bottom portion 2b of the rotor is vacuum-adsorbed on the disc 23, the grip body 25 of the rotating body 17 is moved in accordance with the cam follower 38 as shown in FIG.
As shown in Fig. 5 (d), the cam follower 38, and therefore the gripper 25, is moved forward immediately before reaching the H station.
It is configured to retreat as shown in FIG.
In addition, 45 is a bushing.

The support tool 13 at the mouth end 2a of the can body 2 is disposed along the peripheral edge of a turret (not shown) coaxial with the turret 5 so as to face the corresponding holder 12. The support 13 has a sliding shaft 46.
And a receiver 47 fixed to the sliding shaft 46 for receiving the mouth end portion 2a of the can body 2 (see FIG. 5 (a)).

The sliding shaft 46 is retracted by a cam mechanism (not shown) along the guide member (not shown) to the position shown in FIG.
Immediately after exiting from, as shown in FIG. 5 (d), it is configured to return to the original position and be received by the receiving end 47 of the mouth end portion 2a of the can body 2.

As shown in FIG. 5 (c), the high-frequency current conductors 9a and 9b facing each other are two conductors 9a ₁ and 9a _{2 which} are adjacent to each other and are arranged so that currents flow in the same direction.
9b _1, 9b ₂ is formed from, these conductors (within no contact with the mouth end 2a) as much as possible to the mouth end 2a is arranged to close. Reference numeral 48 is a high-permeability material for increasing the density of magnetic flux based on the high-frequency current, for example, a magnetic core made of ferrite, and 49 is a cooling water pipe for cooling. The magnetic core 48 and the cooling water pipe 49 are fixed to a support body 51 made of an aluminum alloy.

The softening of the mouth end portion 2a of the can body 2 by the above apparatus is performed as follows.

When the empty pocket 4a of the feeding turret 4 reaches directly below the chute 1, the gate 3 opens and the lowermost can 2 is stored in the pocket 4a and conveyed to the feeding station P. At the feeding station P, as shown in FIG. 5 (a), the grip body 25 of the holder 12 and the can body receiver 36 of the can body holding device 7 are in the retracted position, while the support 13 is in the forward position. Therefore, the lower end portion 2c and the mouth end portion 2a of the body 2 of the can body 2 are supported by the can body receiver 36 and the receiver 47, respectively.

When the can body 2 reaches the station G, the holder 12
The vacuum valve for is opened and the bottom 2 of the can is vacuum adsorbed onto the disc 23. Immediately, the cam follower 38 advances, and the grasping body 25 advances accordingly, and grasps the lower end portion 2c of the body portion of the can body 2. In this case, the can body 2 is lifted slightly upward in the figure so that the can body receiver 36 does not contact the body of the can body 2. When the can body 2 reaches just before the high frequency induction heating coil device 8, the support 13 is retracted to the position shown in FIG. 5 (c), and at the same time, the pulley 28 comes into contact with the kick-off roll and the belt 42, The rotation of the rotating body 17 starts, and while the can body 2 rotates, its mouth end portion 2a passes through the heating coil device 8 in the vicinity of the conductors 9a and 9b, and is softened by heating.

Immediately after passing the above, the disc brake 43 operates,
The rotating body 17, and thus the can body 2, stops rotating. After that, the rotating body 17 retreats to its original position as shown in FIG.
On the other hand, the support 13 is advanced to the original position, and the vacuum suction to the bottom 2b of the can is released at the H station. Thereafter, the can body 2 is supported by the can body receiver 36 and the receiver 47, reaches the delivery station Q, is sent to the delivery turret 6 there, and is then discharged through the discharge chute 10 to be sent to the next step.

(Specific example) Made of aluminum alloy (3004 H12) with a body outer diameter of 45
The drawn and ironed can body 2 having a thickness of mm, a mouth end portion 2a of 0.35 mm and a height of 153 mm was loaded into the above apparatus and the mouth end portion 2a was heated. The radial distance from the center of the heating turret 5 to the center of the can 2 is 300 mm, and the rotation speed of the turret 5 is 12.5.
The effective length of the rpm and the conductors 9a and 9b was 315 mm, and the passage time of the high frequency induction heating coil device of each can body 2 was 0.4 seconds.

Further, the rotation speed of the can body 2 is 600 rpm, the output of the high frequency induction heating coil device 8 is 50 kW, the interval width (one side) between the conductors 9a and 9b and the mouth end 2a is 1.5 mm, and the widths of the conductors 9a and 9b ( W; Fig. 5 (c))
The distance (y) from the open end face 2d of the can to the conductors 9a and 9b was 18 mm.

FIG. 6 shows the hardness (micro-Vickers hardness) distribution along the axial direction of the body of the can 2 that has been subjected to the heat treatment under the above conditions.

(Effect of the invention) According to the present invention, the mouth end portion of the seamless can body is continuously
In addition, it is possible to uniformly heat and soften the material in the circumferential direction in a very short period of time, and it is possible to obtain the effects of high productivity and simple work.

[Brief description of drawings]

FIG. 1 is a front view for explaining an apparatus which is an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of an essential part taken along line II-II of FIG.
The drawing mainly showing the structure of the holder, FIG.
FIG. 4 is a vertical sectional view taken along the line III-III of FIG. 4, FIG. 4 is a side view of an essential part seen from the left side of FIG. 2, and FIG. FIG. 5 (a) is a drawing for explaining an essential part for showing the operation, FIG. 5 (a) is a state immediately after receiving a can body in a turret, FIG. 5 (b) is a state before entering a high frequency induction heating coil device, FIG. 5 (c) is a state of passing through the high frequency induction heating coil device, FIG. 5 (d) is a diagram showing a state immediately before the can body is delivered from the turret, and FIG. 6 is heating by the device of the present invention. It is a diagram which shows the example of the hardness distribution along the axial direction of the trunk | drum of the softened can body. 2 ... Seamless can body, 2a ... mouth end, 2b ... bottom, 2c ... trunk lower end, 5 ... heating turret, 8 ... high frequency induction heating coil device, 9a, 9b ... conductor, 12 ... holder, 15 ... Central axis, 16
... Vacuum suction holes, 17 ... Rotating body, 20 ... Supporting body, 21 ... Guide pin (guide member), 25 ... Gripping body, 38 ... Roller cam follower, 44 ... Fixed plate cam.

Claims (1)

[Claims] 1. A plurality of holders for a seamless can body provided along a peripheral portion of a turret, and a part of a transition path of the mouth end portion of the seamless can body held by the holder, and the mouth end portion. With a high-frequency induction heating coil device having arc-shaped conductors facing each other, and a fixed cam, which are arranged at a position close to the mouth end with a vacuum holding the bottom of the seamless can body. It has a vacuum suction hole for suction, and has a central axis in a fixed position in the axial direction; it can slide along the central axis in the axial direction and can rotate with the central axis. A rotating body having a grasping body for grasping the rotating body; and a supporting body having a cam follower for pivotally supporting the rotating body and sliding along a guide member fixed to the turret, the cam follower engaging with a fixed cam. Together with the rotation of the turret Heating apparatus of the mouth end of the seamless can body, characterized that it is reciprocable in the have-axis direction.