JPH0852518A - Forming device of can - Google Patents

Abstract

PURPOSE:To surely avoid leakage of gas between flat plates, and to reduce friction force of a rotating member by providing a cylinder chamber arranged with a gas tightness maintaining means along all periphery around a rotating shaft of rotating member on the rear face of flat member and a pressure source to supply pressurizing fluid. CONSTITUTION:After deep drawing and ironing is executed to form a can while a punch 25 pushes through a forming body into a through hole of die, gas is discharged into a can body from the tip of punch 25 to release a can body from the punch. In this case, the through hole 52a of a ring body 52 communicates with the gas supply hole 53a of a sliding member 53. The ring body 52 and sliding member 53 is pressed in the direction to be brought into tight contact by the pressurizing gas supplied to a cylinder chamber 58 arranged at the rear of the sliding member 53. The cylinder chamber 58 is formed to annular shape along all periphery on the rear face of sliding member 53, the pressing force uniform in the peripheral direction is applied to the sliding member 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is directed to deep drawing by moving a straight rod-shaped punch back and forth in a through hole of a die.
The present invention relates to a can forming device for forming a can body made of metal such as aluminum or steel by performing ironing processing (DI processing, draw-and-ioning processing).

[0002]

2. Description of the Related Art Generally, a bottomed cylindrical can body made of aluminum, steel, or the like is formed into a cup shape by a cupping press, and then placed in a through hole of a die to make a reciprocating straight line. Movable punch allows deep drawing
It is formed by ironing.

As a molding apparatus for molding such a can body, there is, for example, a structure shown in JP-A-6-71350. This molding apparatus has a large gear with inner peripheral teeth formed, a pitch circle diameter of the same diameter as the pitch circle radius of the large gear, and meshes with the inner peripheral teeth of the large gear along the large gear. It consists of a moving small gear, a drive mechanism connected to this small gear and revolving the small gear around the axis of the large gear, and a punch rotatably provided on the pitch circle of the small gear. ing.

According to this molding apparatus, a small gear having a pitch circle diameter equal to the pitch circle radius of the large gear is meshed with the inner peripheral teeth of the large gear, and the small gear is driven by the drive mechanism. When revolving around the center, the small gear rotates along with the revolution, and one point on the pitch circle of the small gear moves along a path that reciprocates linearly on the diameter of the pitch circle of the large gear. As a result, there is an advantage that the punch rotatably provided at one point on the pitch circle of the pinion gear can be smoothly and swiftly reciprocated, and the can processing speed of the can can be improved. Further, since the punch can be moved without swinging, it is possible to prevent the bearing portion supporting the punch from being burdened, and it is possible to stably carry out the forming process of the can body for a long period of time.

Further, in the above-mentioned molding apparatus, in order to smoothly release the molded can body from the tip of the punch, gas is supplied to the gas discharge hole a in the punch and discharged from the tip of the punch into the can body. It is designed to let you. In this case, in the above molding apparatus, since the reciprocating speed of the punch has been significantly improved, the supply of gas from the fixed side to the gas discharge hole is replaced with a conventional flexible hose, and a pipe connected in a link shape is used. It will be done by members.

As shown in FIG. 7, for example, the piping member 1 communicates with an L-shaped rotating body 3 which is rotated around an axis 2 of a large gear, and a flow path 3a of the L-shaped rotating body 3. A ring body 4 having a communication hole 4a and a sliding contact member 6 provided on the fixed side and brought into close contact with a spring 5 on the surface of the ring body 4 are provided. Then, the gas supply hole 7 opening on the sliding surface 6a of the sliding contact member 6 is made to communicate with or cut off from the communication hole 4a according to the rotational angle position of the ring body 4, so that gas is discharged according to the position of the punch 8. The gas is discharged from the hole 8a and stopped.

That is, in the state where the punch 8 reaches the front end of movement and the can body is formed, the gas supply hole 7 is communicated with the communication hole 4a to send gas into the can body, and the punch 8 is extracted from the can body. In this state, the positions of the gas supply hole 7 and the communication hole 4a are completely displaced and blocked, and the gas discharge from the tip of the punch 8 is stopped. In this case, the airtightness of the sliding surface 6 a between the ring body 4 and the sliding contact member 6 is maintained by the biasing force of the spring 5.

In FIG. 4, reference numeral 9 is a connecting member, and 9
a is a flow path inside the connecting member 9, 10 is a connecting pin, 10a is a flow path inside the connecting pin 10, and 11 is a hose that connects the flow path 9a of the connecting member 9 with the gas discharge hole 8a of the punch 8. .

[0009]

By the way, in the molding apparatus having the above structure, the springs 5 are provided at, for example, four positions in the circumferential direction of the sliding contact member 6, so that the sliding contact is possible. The member 6 and the ring body 4 are brought into close contact with each other by the local biasing force. Therefore, the sliding member 6
The urging force at is highest at the position of the spring 5 and lowest between the springs 5,
The distribution of the pressing force on the sliding surface 6a becomes uneven along the circumferential direction.

However, if the distribution of the pressing force on the sliding surface 6a becomes non-uniform as described above, a minute gap is likely to be formed at the place where the pressing force is the smallest, and the airtightness on the sliding surface 6a is impaired. Inconvenience is possible. When the airtightness is impaired, the pressurized gas trapped in the gas supply hole 7 by the ring body 4 contacts the ring body 4 and the sliding contact member 6.
It spouts out from the gap between and, causing problems such as noise.

In order to avoid this, it can be considered that the biasing force of the spring 5 is increased to increase the pressing force as a whole. However, in this case, the frictional force on the sliding surface 6a between the ring body 4 and the sliding contact member 6 increases, which hinders the smooth rotational movement of the L-shaped rotating body 3 and also causes the sliding surface 6a to move. It is conceivable that inconvenience such as local wear will occur.

The present invention has been made in view of the above-mentioned circumstances, and smoothly and surely supplies gas to the gas discharge holes of a punch that can be rapidly linearly moved back and forth to separate the can body from the punch. (EN) Provided is a can forming device capable of easily forming a mold, reliably preventing gas from leaking at an intermediate position of a supply flow path, and capable of stably and stably performing a forming process of a can body. It is an object.

[0013]

In order to achieve the above object, the present invention is directed to deep drawing by moving a straight rod-shaped punch back and forth in a through hole of a die fixed to a gantry.
A can forming apparatus for forming a can body by performing ironing processing, comprising a linear movement mechanism for linearly reciprocating the punch in the longitudinal direction thereof, and a gas supply mechanism for discharging gas from the tip of the punch. The linear movement mechanism is a large gear fixed to a pedestal and having inner peripheral teeth, and a small gear having a pitch circle diameter of the same diameter as the pitch circle radius of the large gear and meshing with the inner peripheral teeth of the large gear, A driving mechanism connected to the small gear for revolving the small gear about the axis of the large gear; and a support shaft provided on the pitch circumference of the small gear for rotatably connecting the punch, A supply mechanism has a gas supply source fixed to the gantry, a gas discharge hole provided inside the punch and opening at the tip of the punch, and a communication flow communicating the gas discharge hole and the gas supply source. And a communication passage, A flow passage inside the rotary member rotatably supported around the axis of the large gear, a flow passage inside the connecting member fixed to the small gear, and the connecting member and the rotating member are rotated around the axis of the small gear. The flow path inside the connecting pin that freely connects and the flow path disposed between the communication member and the gas discharge hole are communicated in a sealed state with respect to the outside, and the flow path of the rotating member and the gas supply A sliding connection portion disposed between the rotary source and the gas source, the sliding connection portion being fixed to the flow path of the rotating member and the gas supply source and being slid in close contact with each other. A pair of flat plate members that open or close the flow path of the rotary member that opens to the sliding surface and the gas supply source according to the rotational position, and airtightness that holds the flat plate members so that they do not separate when blocked. Holding means, and the airtight holding means is A cylinder chamber which is provided over the entire circumference about the axis of the rotary member to the back of the member proposes a molding apparatus can made of a pressure source for supplying pressurized fluid to the cylinder chamber.

Further, the airtightness maintaining means is communicated with the gas supply source when the flow path of the rotating member and the gas supply source are cut off, and exhausts the gas supplied from the gas supply source. May consist of

[0015]

According to the can forming apparatus of the present invention, when the drive mechanism is actuated, the small gear is revolved about the axis of the large gear and is rotated by meshing with the inner peripheral teeth of the large gear. In this case, the support shaft provided on the pitch circle of the small gear is moved in a reciprocating manner on the diameter of the pitch circle of the large gear. Therefore, since the punch is rotatably attached to the support shaft, the punch is allowed to reciprocate linearly together with the support shaft.

Further, at this time, the gas supply mechanism is operated to supply gas from the gas supply source fixed to the gantry to the gas discharge hole provided in the punch through the communication flow path, and is arranged at the tip of the punch. It is possible to discharge the gas into the existing can body and release the can body from the punch. In this case, the communication flow path seals the flow path provided inside the rotary member, the connection pin, and the communication member that are rotatably connected to each other, and the flow path that connects the flow path and the gas discharge hole. Since it is configured to communicate with the state, it becomes possible to smoothly follow the rapid reciprocating linear motion of the punch and supply the gas in a durable manner.

Particularly, the flow path of the rotating member and the gas supply source are
When the can body is released from the punch, the flow path and the gas supply source are connected or cut off by the relative rotation of the pair of slidable flat plate members that are connected by the sliding connection portion. It is possible to discharge the gas from the gas discharge hole only in the above state and stop the discharge of the gas in other states. In this case, when the airtightness maintaining means is operated, the flat plate members are held so as not to be separated from each other, and the gas is prevented from leaking from between the flat plate members.

Since the airtightness maintaining means is composed of the cylinder chamber and the pressure source, the flat plate member is supplied with the pressurized fluid from the pressure source to the cylinder chamber which is arranged on the rear surface of the plate member over the entire circumference. As a result, a uniform pressing force is applied over the entire circumference, and a uniform pressing force distribution is achieved on the sliding surface.

As a result, the airtightness between the flat plate members is improved, and the leakage of gas can be reliably prevented, and the leakage can be effectively prevented by the minimum necessary pressing force. Therefore, the frictional force between the sliding surfaces of the flat plate members is suppressed to the minimum, and the rotary motion of the rotary member is smoothly performed.

Further, when the airtightness maintaining means is constituted by the exhaust flow passage, the gas supplied from the gas supply source is exhausted when the gas supply source and the flow passage of the rotating member are cut off. Since the gas is discharged through the plate, it is possible to reliably prevent the gas from leaking between the flat plate members without increasing the pressure in the flow path.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a can forming apparatus according to the present invention will be described below with reference to FIGS. As shown in FIGS. 2 and 3, the can forming device 20 according to the present embodiment is a cup-shaped formed body that is carried into the through hole 22a of the die 22 from above the pedestal 21 and positioned and fixed by the cup holder 23. 24, a long punch 25 for deep drawing and ironing while inserting the through hole 22a of the die 22, a linear moving mechanism 26 for linearly moving the punch 25 back and forth, and a punch 25 for linearly moving back and forth. Gas is supplied to the gas discharge holes 27 formed inside the punch 2
5 is ejected from the tip of the can 5, and the molded can body 28 is punched 2
5 and a gas supply mechanism 29 for releasing the mold from the tip. The gas may be air, for example.

As shown in FIG. 2, the linear moving mechanism 26 has an annular large gear 31 having an inner peripheral tooth fixed to the fixed cylindrical body 30 in a fixed cylindrical body 30 fixed to the pedestal 21.
And a rotary shaft body 32 disposed in the large gear 31 and rotatably supported by the fixed cylindrical body 30, and an inner peripheral tooth of the large gear 31 that meshes with the rotary shaft body 32 by a gear support 33. A small gear 34 that is rotatably attached; a drive mechanism 35 that revolves the small gear 34 around the axis 31a of the large gear 31 by rotating the rotating shaft body 32 around the axis 31a of the large gear 1; A support shaft 36 that is arranged on the pitch circumference of the gear 34 in parallel with the axis 34a thereof and is integrally provided on the gear support 33, a connecting rod 37 that is rotatably supported by the support shaft 36, and the connection. It is composed of a hollow pin 38 that rotatably connects the rod 37 and the base end of the punch 25.

The small gear 34 is formed to have a pitch circle diameter that matches the pitch circle radius of the large gear 31. Thus, when the small gear 34 is moved along the inner peripheral teeth of the large gear 31 by the operation of the drive mechanism 35, the fixed point fixed on the pitch circle of the small gear 34 passes through the center point of the large gear 31. It can be moved on a straight line. That is, the support shaft 36 provided on the pitch circle of the small gear 34 can be linearly moved back and forth on the pitch circle diameter of the large gear 31 while the small gear 34 revolves once.

Therefore, the connecting rod 37 whose base end is rotatably attached to the support shaft 36 and the punch 25 attached to the connecting rod 37 are easily moved in the longitudinal direction along with the linear movement of the support shaft 36. It is designed to make a reciprocating linear motion along the. In the figure, reference numeral 39 is a flywheel, 40 is a motor for rotationally driving the flywheel 39, and 41 is rotation of the flywheel 39.
Is a clutch, 42 is a pulley, and 43 is a belt.

Further, the gas supply mechanism 29 includes a pedestal 21.
A gas supply source 44 fixed to the punch 25 and a gas discharge hole 2 provided inside the punch 25 and opened at the tip of the punch 25.
7 and a communication passage 45 that connects the gas discharge hole 27 and the gas supply source 44.

As shown in FIG. 1, the communication passage 45 has a hose 46 whose one end is connected to the base end of the gas discharge hole 27 of the punch 25, and the support shaft 36 which is connected to the other end of the hose 46. A flow path 36a inside, a flow path 47a inside a hollow connecting member 47 fixed to the tip of the support shaft 36 and arranged at the other end on the axis 34a of the small gear 34, and around the axis 31a of the large gear 31 on the gantry 21. The flow path 48a inside the rotating member 48 rotatably supported by the inside of the connecting pin 49 that connects the rotating member 48 and the connecting member 47 on the axis 31a of the small gear 31 so as to be rotatable around the axis 31a. Channel 49a
And a sliding connection portion 50 arranged between the flow path 48a inside the rotating member 48 and the gas supply source 44.

The flow path 3 inside the hose 46 and the support shaft 36.
A ring-shaped sliding contact member 51 that slides on the outer peripheral surface of the support shaft 36 is provided at the connection portion with the 6a. Sliding fitting 5
1, a hose mounting hole 4 to which the tip of the hose 46 is connected.
6a is provided, and the flow path 36a formed in the support shaft 36 is communicated with the hose mounting hole 46a.

Further, the flow path 36a is provided with one inlet hole formed along the axis of the support shaft 36, and a ring-shaped space 51 communicating with the inlet hole and formed in the sliding contact member 51.
and a cross-shaped outlet hole communicating with a. The inlet hole is communicated with the flow path 47 a inside the communication member 47.

The flow path 47a inside the connecting member 47 has a ring-shaped recess 49b formed in the connecting pin 49,
It communicates with a substantially H-shaped channel 49a. In addition, this channel 4
A flow path 48a inside the rotary member 48 is connected to 9a via a ring-shaped recess 49c formed in the connecting pin 49. Further, the flow path 48a inside the rotating member 48
The ring member 52 attached to the rotating member 48
Communication hole 52a is communicated.

The sliding connection portion 50 is composed of the ring body 52.
And a sliding contact member 53 that is disposed in close contact with the upper surface of the sliding contact member 53 and is slid on the upper surface of the ring member 52 by rotation of the rotating member 48, and a pressing force that presses the sliding contact member 53 and the ring member 52 in a close contact direction Means 54 (Airtightness Holding Means)
Is provided.

The sliding contact member 53 is provided with a gas supply hole 53a connected to a gas supply source 44 fixed to the pedestal 21. Further, the communication hole 52a provided in the ring body 52 is an arc-shaped elongated hole having a predetermined length along the circumferential direction around the axis 31a of the rotating member 48, and within the predetermined rotation angle range of the rotating member 48. At gas supply hole 5
The communication state with 3a can be maintained, and it is blocked from the gas supply hole 53a in the other rotation angle range.

The pressing means 54 is movable in the axial direction so as to support the sliding contact member 53 at the tip of a post 56 that rotatably supports the rotating member 48 via a bearing 55. Ring-shaped block 5 provided
The cylinder chamber 58 is defined between the post 7 and the post 56, and the pressure source 59 supplies a pressurized fluid to the cylinder chamber 58. The cylinder chamber 58 is
The rotary member 48 is formed in an annular shape around the axis 31a of the rotary member 48 and is provided in an airtight state by a seal member 60 such as an O-ring. As the pressure source 59, for example, the gas supply source 44 may be shared. Further, it may be provided separately from the gas supply source 44.

When the can body 28 is formed by using the can forming apparatus 20 having the above-described structure, the cup holder 24 is placed inside the cup-shaped body 24 carried into the through hole 22a of the die 22. 23 is inserted and the molded body 24 is positioned on the die 22. Then, the long punch 25 is inserted by the linear movement mechanism 26 into the inside of the cup holder 23 and the through hole 22a of the die 22 to deep-draw / iron the formed body 24, and the can bottom receiving portion 61.
And the can body 28 is completed. After that, by operating the gas supply mechanism 29, the can 24 is released from the tip of the punch 25 by ejecting the gas from the gas ejection hole 27 opened at the tip of the punch 25. Discharge.

In this case, the operation of the linear movement mechanism 26 for linearly reciprocating the punch 25 will be described in detail below.
By rotating the flywheel 39 via the pulley 42 and the belt 43 by driving the motor 40 to rotate, the flywheel 39 is connected via the clutch 41 connecting the flywheel 39 to the rotary shaft body 32 during normal operation. Is transmitted to the rotary shaft body 32. As a result, the rotary shaft 3
Since 2 is rotated inside the fixed cylindrical body 30, the small gear 34 meshing with the large gear 31 has the axis 31 of the large gear 31.
While being revolved around a, it is rotated along with the gear support 33.

As a result, the support shaft 36, which is provided at the end of the gear support 33 so as to project on the pitch circle of the small gear 31, has a connecting rod 37 rotatably connected thereto via a bearing. Together with the hollow pin 38 and the punch 25, the large gear 31 is linearly moved back and forth by the diameter of the pitch circle. In this case, while the small gear 34 makes one revolution while rotating along the inner peripheral teeth of the large gear 31, the small gear 3
4. The support shaft 36 makes one rotation about its own axis while reciprocating linearly.

The connecting rod 37, which is rotatably connected to the supporting shaft 36 via a bearing, smoothly supports the rotation of the supporting shaft 36 by the bearing and reciprocates linearly, so that the connecting rod 37 has a hollow pin. Punch 2 connected via 38
The 5 also reliably and swiftly moves linearly without swinging in a direction orthogonal to its axis. Therefore, punch 25
Can be smoothly inserted into the through hole 22a of the die 22, and the can body 28 can be molded at high speed.

The other end of the connecting member 47, one end of which is attached to the support shaft 36, together with the connecting pin 49 rotatably connected to this end, the axis 34 of the pinion gear 34.
Similar to a, it rotates about the axis 31a of the large gear 31. Further, the rotating member 48 rotatably supporting the connecting pin 49 is rotated about the axis 31a of the large gear 31 as the connecting pin 49 rotates.

Then, after the punch 25 performs deep drawing and ironing to form the can body 28 while the formed body 24 is inserted into the through hole 22a of the die 22, the punch 25 is formed.
In order to release the can body 28 from the mold, gas is discharged from the tip of the punch 25 into the can body 28. In this case, the communication hole 52a of the ring body 52 provided in the rotating member 48 and the gas supply hole 53a of the sliding contact member 53 which is slidably contacted with the ring body 52 are communicated with each other to be fixed to the pedestal 51. From the gas supply source 44, the gas supply hole 53a, the communication hole 52a, the flow path 48a of the rotating member 48, the connecting pin 49.
Ring-shaped recess 49c, channel 49a, ring-shaped recess 49
b, the flow path 47a of the connecting member 47, the flow path 36 of the support shaft 36
Gas is supplied into the gas discharge hole 27 of the punch 25 through the ring-shaped space 51a of the sliding contact device 51, the hose mounting hole 46a, and the hose 46. As a result, the can body 28 is easily released from the punch 25.

In this case, the ring body 52 and the sliding contact member 53 are pressed in a direction in which they are in close contact with each other by the pressurized gas supplied to the cylinder chamber 58 provided on the back surface of the sliding contact member 53. . Since the cylinder chamber 58 is formed in an annular shape on the back surface of the sliding contact member 53 and is arranged over the entire circumference, a uniform pressing force is applied along the circumferential direction.
3 can be given.

As a result, the distribution of the pressing force on the sliding surface 53b between the sliding contact member 53 and the ring body 52 can be made uniform, and the sliding surface 53b can be evenly sealed. Therefore, as compared with the conventional case where a plurality of springs 5 are pressed, the sliding surface 53b is
The airtightness in the can be improved.

In particular, the effect of improving the airtightness is as follows.
Is released most from the punch 25 and the discharge of the gas from the tip of the punch 25 is stopped, and is most exerted. That is, the discharge of the gas from the gas discharge hole 27 is stopped when the communication hole 52a of the ring body 52 comes off from the gas supply hole 53a of the sliding contact member 53 due to the rotation of the rotating member 48. In this case, the gas supply hole 53a is closed by the ring body 52, and the enclosed gas tends to be ejected from the sliding surface 53b between the sliding contact member 53 and the ring body 52.

Therefore, when the distribution of the pressing force on the sliding surface 53b is non-uniform, the gas is ejected from the place where the pressing force is the smallest. However, if they are brought into close contact with each other with a uniform pressing force as in this embodiment, the ejection of gas can be effectively prevented, and inconveniences such as the generation of noise can be avoided.

Further, in this embodiment, the pressure source 59 of the pressurized gas supplied to the cylinder chamber 58 is also used as the gas supply source 44, so that the pressure in the cylinder chamber 58 and the gas supply hole 53a are confined. And the pressure of the gas becomes equal. For this reason, the cross-sectional area of the cylinder chamber 58 is set to the gas supply hole 5
If it is formed larger than 3a, the airtightness can be surely maintained. Moreover, since the pressing force for maintaining the airtightness can be set to the necessary minimum, the frictional force on the sliding surface 53b can be reduced, and the smooth operation of the rotating member 48 can be ensured.

Next, another embodiment of the can forming apparatus according to the present invention will be described with reference to FIGS. The can forming apparatus 20 according to the present embodiment differs from the above embodiment in the airtightness maintaining means. It should be noted that the same reference numerals are given to the portions having the same configurations as those of the above-described embodiment, and the description will be simplified.

As shown in FIGS. 4 to 6, the airtightness maintaining means of the present embodiment has a sliding contact member 101 and a ring body 102.
It is configured by providing an exhaust passage 103 in the.
The exhaust passage 103 includes an exhaust port 104 provided in the sliding member 101 and a groove-like passage 105 provided in the ring body 102.

The exhaust port 104 is, for example, the ring body 1.
It is arranged at a position displaced inward in the radial direction so as not to contact the communication hole 52a of No. 02. In addition, the groove-shaped channel 10
5 is formed over the entire circumference on the sliding surface 102a of the ring body 102 with the communication hole 52a and the partition wall 106 separated from each other, and the exhaust port 104 can always be arranged inside thereof. ing. The partition wall 106 is formed to have a width dimension smaller than the diameter of the gas supply hole 53 a, and the gas supply hole 53 a is slidable on the sliding surface 102 of the ring body 102.
It is set so that the moment when it is completely closed by a does not occur.

According to the can forming apparatus thus constructed, the position of the punch 25 (that is, the rotation angle of the rotating member 48) is released when the can body 28 formed at the tip of the punch 25 is released. According to the gas supply hole 53a of the sliding contact member 101.
And the communication hole 52a of the ring body 102 are communicated with each other as shown in FIG. 5, and the gas is discharged from the tip of the gas discharge hole 27. Then, in the state where the can body 28 is completely released from the punch 25, the gas supply hole 53a is disengaged from the communication hole 52a of the ring body 102 and the gas discharge is stopped. In this case, the gas supply hole 53a is immediately arranged inside the groove-like flow path 105.

Since the exhaust port 104 is always arranged in communication with the groove-shaped channel 105, the gas supplied from the gas supply hole 53a to the groove-shaped channel 105 is exhausted as shown in FIG. It will be discharged to the outside through the mouth 104. Therefore, according to the can forming apparatus of the present embodiment, even if the discharge of the gas from the gas discharge hole 27 is stopped, the gas is prevented from being contained in the gas supply hole 53a. , Sliding contact member 101 and ring body 1
It is possible to effectively prevent the gas from being jetted from the sliding surface 102a with respect to 02.

[0049]

As described in detail above, the can forming apparatus according to the present invention is provided with a linear movement mechanism and a gas supply mechanism,
The linear movement mechanism has a large gear having an inner peripheral tooth, a small gear having a pitch circle diameter of the same diameter as the pitch circle radius and meshing with the large gear, and a drive mechanism for revolving the small gear around the axis of the large gear. And a support shaft provided on the pitch circumference of the small gear and rotatably connecting the punch, and the gas supply mechanism communicates the gas supply source with the gas discharge hole opened at the tip of the punch. And a flow path between the rotating member, the communication member, the connecting pin and the communication member and the gas discharge hole in a sealed state, and the flow path of the rotary member. A sliding connection portion provided between the gas supply source and a sliding connection portion is provided, and the sliding connection portion is slidably and closely contacted with each other, and the flow path of the rotating member opened to those sliding surfaces and the gas supply source. It consists of a pair of flat plate members that connect and disconnect the Since the airtightness holding means is composed of a cylinder chamber provided on the back surface of the flat plate member around the entire rotation axis of the rotary member and a pressure source for supplying a pressurized fluid thereto, the drive mechanism By moving the support shaft linearly back and forth on the pitch circle diameter of the large gear by the operation of, the punch can be swiftly linearly moved without swinging. The gas can be reliably supplied by the gas supply mechanism to easily release the can from the punch.

Further, when the flow path of the rotary member and the gas supply source are shut off depending on the position of the punch, the pressurized fluid supplied to the cylinder chamber causes the flat plate members to move completely around the axis of the rotary members. Since the contact can be made with a uniform pressing force over the circumference, it is possible to reliably prevent the gas enclosed in the flow path from leaking from between the flat plate members. Furthermore, since the pressing force between the flat plate members is the minimum necessary pressure for maintaining the airtightness, the frictional force that hinders the rotating operation of the rotating member can be reduced and the rotating members can be operated smoothly.

Further, the airtightness maintaining means is connected to the gas supply source when the flow path of the rotary member and the gas supply source are cut off, and the exhaust flow path for discharging the gas supplied from the gas supply source. According to the configuration, even when the flow path is blocked by the flat plate member, the gas is not confined, and the pressure rise itself that leaks the gas between the flat plate members can be avoided. Play. As a result, similar to the can forming apparatus having the above-described configuration, the punch can be swiftly and smoothly moved back and forth, and the can body can be released from the punch without gas leakage.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a gas supply unit showing an embodiment of a can forming apparatus according to the present invention.

FIG. 2 is a partially cutaway vertical cross-sectional view showing the overall configuration of the can forming apparatus of FIG.

3 is a partially cutaway front view showing the vicinity of a die of the can forming device of FIG. 1. FIG.

FIG. 4 is a perspective view for explaining another embodiment of the can forming apparatus according to the present invention.

5 is a schematic view for explaining the operation of the can forming device in FIG. 4. FIG.

FIG. 6 is a schematic view for explaining the operation of the can forming device as in FIG.

FIG. 7 is a vertical cross-sectional view showing a conventional example of a can forming device.

[Explanation of symbols]

 20 Molding device 21 Frame 22 Die 22a Through hole 25 Punch 26 Linear movement mechanism 27 Gas discharge hole 28 Can body 29 Gas supply mechanism 31 Large gear 31a / 34a Axis 34 Small gear 35 Drive mechanism 36 Support shaft 44 Gas supply source 45 Continuous flow Path 46 / 47a / 48a / 49a Flow path 47 Connecting member 48 Rotating member 49 Connecting pin 50 Sliding connection part 52 Sliding contact member (flat plate member) 53 Ring body (flat plate member) 53b Sliding surface 54 Pressing means (keeping airtightness) Means) 58 cylinder chamber 59 pressure source 103 exhaust passage (airtightness holding means)

Claims (2)

[Claims] 1. A deep drawing is performed by linearly reciprocally moving a straight rod-shaped punch into a through hole of a die fixed to a gantry.
A can forming device for forming a can body by performing ironing processing, comprising: a linear movement mechanism for linearly reciprocating the punch in the longitudinal direction thereof; and a gas supply mechanism for discharging gas from the tip of the punch. The linear moving mechanism is a large gear fixed to a pedestal and having inner peripheral teeth, and a small gear having a pitch circle diameter of the same diameter as the pitch circle radius of the large gear and meshing with the inner peripheral teeth of the large gear, A driving mechanism that is connected to the small gear to revolve the small gear around the axis of the large gear; and a support shaft that is provided on the pitch circumference of the small gear and that rotatably connects the punch, the gas A supply mechanism has a gas supply source fixed to the gantry, a gas discharge hole provided inside the punch and opening at the tip of the punch, and a communication flow communicating the gas discharge hole and the gas supply source. And a communication path, A channel inside the rotary member rotatably supported on the base around the axis of the large gear, a channel inside the connecting member fixed to the small gear, and the connecting member and the rotating member around the axis of the small gear. A flow path inside the connecting pin that is rotatably connected to the flow path, and a flow path provided between the communication member and the gas discharge hole in a sealed state with respect to the outside, and a flow path of the rotary member. A sliding connection portion provided between the sliding connection portion and the gas supply source, the sliding connection portion being fixed to the flow path of the rotating member and the gas supply source and being slid in close contact with each other; A pair of flat plate members that connect or block the flow path of the rotary member that opens to the sliding surface and the gas supply source depending on the rotational position, and hold the flat plate members so that they do not separate when blocked. And an airtightness holding means, wherein the airtightness holding means is A can forming apparatus comprising: a cylinder chamber provided on the back surface of a flat plate member around the rotation axis of a rotating member over the entire circumference thereof; and a pressure source for supplying a pressurized fluid to the cylinder chamber. 2. A deep drawing is performed by linearly moving a straight rod-shaped punch back and forth in a through hole of a die fixed to a gantry.
A can forming device for forming a can body by performing ironing processing, comprising: a linear movement mechanism for linearly reciprocating the punch in the longitudinal direction thereof; and a gas supply mechanism for discharging gas from the tip of the punch. The linear moving mechanism is a large gear fixed to a pedestal and having inner peripheral teeth, and a small gear having a pitch circle diameter of the same diameter as the pitch circle radius of the large gear and meshing with the inner peripheral teeth of the large gear, A driving mechanism that is connected to the small gear to revolve the small gear around the axis of the large gear; and a support shaft that is provided on the pitch circumference of the small gear and that rotatably connects the punch, the gas A supply mechanism has a gas supply source fixed to the gantry, a gas discharge hole provided inside the punch and opening at the tip of the punch, and a communication flow communicating the gas discharge hole and the gas supply source. And a communication path, A channel inside the rotary member rotatably supported on the base around the axis of the large gear, a channel inside the connecting member fixed to the small gear, and the connecting member and the rotating member around the axis of the small gear. A flow path inside the connecting pin that is rotatably connected to the flow path, and a flow path provided between the communication member and the gas discharge hole in a sealed state with respect to the outside, and a flow path of the rotary member. A sliding connection portion provided between the sliding connection portion and the gas supply source, the sliding connection portion being fixed to the flow path of the rotating member and the gas supply source and being slid in close contact with each other; A pair of flat plate members that open or close the flow path of the rotary member that opens to the sliding surface and the gas supply source depending on the rotational position, and a pair of flat plate members that are held so that the flat plate members do not separate when blocked. And an airtightness holding means, wherein the airtightness holding means is A can forming apparatus comprising an exhaust flow path which is connected to the gas supply source when the flow path of the rotating member and the gas supply source are cut off and discharges the gas supplied from the gas supply source. .