JP3938170B2 - Die cooling method and structure in drawing and ironing. - Google Patents

Description

  The present invention relates to a die cooling structure and a die cooling structure used when a can is manufactured by drawing and ironing.

  In general, when manufacturing metal cans such as canned beer and soft drinks, first the metal can be drawn to form a drawn can, and then the drawn can is ironed to a predetermined shape A method of forming a metal can having a thickness is employed. In this ironing process, the squeezed can is put on the tip of the punch, and it is carried by the stroke of the punch through a plurality of dies arranged so that the opening diameter is gradually reduced, and is squeezed each time it is sequentially passed. The thickness of the body wall will be reduced.

  Patent Document 1 discloses a process for forming a can body using a molding apparatus for a bottomed thin can body. In the molding process, first, a round blank of malleable metal is formed into a cup-shaped molded product X comprising a can bottom forming part Y and a cylindrical can body forming part Z connected to the can bottom forming part Y by drawing. Drawing is performed. Subsequently, as shown in FIG. 6A, the cup-shaped molded product X is fitted to the tip of the punch structure P, and the punch structure P is inserted into the tool pack 16 in the insertion direction. As shown in FIG. 6 (b), the cup-shaped molded product X fitted to the tip of the punch structure P is moved while sliding the outer peripheral surface of the redraw die 14, and the cup-shaped molded product X0 having a predetermined inner diameter. A redrawing process is performed to form the film. Next, as shown in FIGS. 6C to 6E, the punch structure P is inserted into the through hole of the tool pack 16, and the first ironing die 15, the second ironing die 15, and the third iron are sequentially formed. The can body forming portion Z of the cup-shaped molded products X1, X2 and X3 formed by ironing by the ning die 15 is stretched from the can bottom forming portion Y side toward the opening side of the can body forming portion Z, Ironing is performed to form a cup-shaped molded product X4 having a predetermined can height, can diameter, and body wall thickness.

  The ironing process will be described in more detail. First, as shown in FIG. 6 (c), the outer peripheral surface of the cup-shaped molded product X0 fitted to the punch sleeve is provided in the through hole of the tool pack 16. The first ironing process is performed by inserting the inner peripheral side of the first ironing die 15 thus formed. As a result, the cup-shaped molded product X1 moved in sliding contact with the first ironing die 15 is gradually stretched toward the tip of the can body forming portion Z with an increased amount of ironing, and the can body forming portion Z is thinly formed. Next, the cup-shaped molded product X1 stretched by the first ironing die 15 is moved in sliding contact with the second ironing die 15 as shown in FIG. Done. Subsequently, the cup-shaped molded product X2 drawn by the second ironing die 15 is moved in sliding contact with the third ironing die 15 as shown in FIG. Is done. By the ironing process as described above, the can body forming portion Z of the cup-shaped molded product X2 is stretched and formed into a predetermined can height, can diameter and body wall thickness. At this time, the second ironing process is started from the boundary between the can bottom forming part Y and the can body forming part Z of the cup-shaped molded product X1, so that 2 is stretched, and then the third ironing process is performed with a certain amount of ironing on the entire can body forming portion Z, so that the entire surface of the can body forming portion Z is caused by a change in the amount of ironing. Molded uniformly and smoothly without any difference in gloss. Then, the cup-shaped molded product X3 having the can body formed by the ironing process is struck to the doming die 17 of the doming station while being fitted to the punch structure P as shown in FIG. 6 (f). Then, the can bottom forming portion Y is formed into a dome shape.

  The process of squeezing the metal surface between the outer diameter of the punch and the inner diameter of the die in the above forming process involves heat generation, so that the temperature of the punch must be adjusted, for example, by appropriate cooling. Patent Document 2 discloses a tool pack for ironing a can having a cooling function. The structure will be described with reference to FIGS. 4 and 5. As can be seen from FIG. 4 showing the axial cross section, the redraw die 1 is disposed at the right end of the tool pack structure T, and then the first ironing die 5a. Has a basic structure in which the second ironing die 5b is arranged through the die spacer 11, and the third ironing die 5c and the fourth ironing die 5d are continuously arranged through the die spacer 11. . The redraw die 1 and the first ironing die 5a are assembled as the same die module, the second ironing die 5b as the second die module, and the third ironing die 5c and the fourth ironing die 5d. Are assembled as a third die module. The redraw die 1 has an annular shape, and is fitted and fixed to the inside of a casing that also has an annular shape by shrinkage. Similarly, the first ironing die 5a also has an annular shape, and is fitted and fixed to the inside of the casing that also has an annular shape by shrinkage. The two die casings are respectively fixed to the concave portions on both sides formed in the first fixing member A in a fitting form, and further, a second fixing having a convex portion that fits into the concave portion of the first fixing member. The member B has a structure in which the casing of the first ironing die 5a is fitted and bolted so as to sandwich the first fixing member 5a. In the second die module, the second ironing die 5b also has an annular shape, and is fitted and fixed to the inner side of the casing that also takes the annular form by shrinkage, but this casing has a recess on the inner side. Bolt tightened in a form that is fitted in the formed annular fourth fixing member D and is sandwiched by the annular third fixing member C formed with a projection that fits into the recess of the fourth fixing member D. Has been. In the third die module, a third ironing die 5c and a fourth ironing die 5d are fixed by shrinkage on the inside of each case, and a sixth fixing member having recesses formed on both sides is provided. The third ironing die 5c is fixedly fitted, and the third ironing die 5c further includes a convex portion that fits into the concave portion of the sixth fixing member. Is fitted and clamped to the sixth fixing member.

Although the tool pack structure T has a cooling function, a groove is directly formed in the die serving as the heat generating portion, and a cooling liquid is circulated through the groove. An annular groove is formed on the inner side surface of the redraw die 1, and an annular groove O is formed on the back side of the processed surface for the plurality of ironing dies 5a, 5b, 5c, and 5d. As shown in FIG. 5A, the supply of the temperature-controlled water to the groove is alternately 4 in the inlet and outlet at 45 ° intervals in the case where the first ironing die 5a is baked. These are provided one by one, and the supply path to the inlet and the drain return path from the discharge port are formed in a complicated manner in the die modular. FIG. 5 shows the case of the first ironing die 5a, but the temperature control flow path to the groove is basically the same in the other dies. First, in the first die module, an inflow end is provided in the first fixing member, and is drilled in the housing of the redraw die 1 through a supply path drilled in the first fixing member a. The temperature control water is supplied from the four inflow ports to the groove portion O of the die, branched and communicated with the flow channel and the flow channel drilled in the casing of the first ironing die 5a. The temperature-controlled water supplied from the inlet port diverts in the groove in both directions, cools the die, and is discharged from the adjacent outlet port to the return path. At the outlet port, the temperature-controlled water supplied from the adjacent inlet ports on both sides is merged and sent to the channel formed in the first fixing member A through the channel in the housing. The water passing through the casing and the water passing through the casing of the first ironing die 5a are merged and discharged from the discharge end. In the second die modular, the temperature-controlled water supplied from the supply end provided in the third fixing member C is a flow path formed in the third fixing member, and the second ironing die 5b. It is guided and supplied to four inflow ports provided in the casing through a flow path drilled in the casing. The temperature-controlled water supplied from the inlet port diverts in the groove in both directions, cools the die, and is discharged from the adjacent outlet port to the return path. At the inflow port, the temperature-controlled water supplied from the adjacent inflow ports on both sides is merged and discharged from a discharge end provided in the fourth fixing member D through the flow path in the housing. In the third die modular, the temperature-controlled water supplied from the supply end provided in the fifth fixing member e is a flow path drilled in the fifth fixing member e, and a third ironing die. It is guided to the four inlets provided in the casing through the flow path drilled in the casing of 5c and supplied to the groove E provided on the back surface of the die 5c. The water after the heat exchange is discharged from the four outflow ports H, and is merged in the flow path formed in the housing, and then discharged from the discharge end provided in the sixth fixing member. Further, for the cooling of the fourth ironing die 5d, a temperature control water supplied from a supply end provided in the sixth fixing member is formed in the flow path formed in the sixth fixing member, The ironing die 5d is guided to the four inlets provided in the casing via the perforated flow paths in the casing and supplied to the grooves O provided on the back surface of the die 5d. The water after the heat exchange is discharged from the four outflow ports H, and is merged in the flow path formed in the housing, and then discharged from the discharge end provided in the sixth fixing member.
JP, 6-142780, A "Molding method of a bottomed thin can body" Published on May 24, 1994 Paragraph [0014] thru | or [0021] and description of FIG. US Patent No. 6,598,451 "INTERNALLY COOLED TOOL PACK" Registered July 29, 2003

The tool pack structure presented in Patent Document 2 requires a large number of members in which complicated flow paths are formed as described above, and in addition, the assembly of the members requires alignment between the flow paths, etc. It is very troublesome. Further, since the cooling structure employs a structure in which a thin groove is formed in the die itself to flow the temperature-controlled water, sufficient heat exchange cannot be performed. Furthermore, although many seal members are used between the members, the die and the housing have a simple shrinkage structure, and since no seal member is used, there is a risk of water leakage from this portion. .
The problem to be solved by the present invention is to solve the above problems, that is, the structure is simple, the manufacture and assembly are easy, there is no risk of water leakage, and above all, the cooling efficiency of the die part is improved. It is to provide an improved tool pack structure.

The ironing die module of the present invention has a structure in which a flat ring-shaped ironing die is sandwiched by disk-shaped water rings from both sides, and a temperature-controlled water inlet and outlet are provided at positions adjacent to the water ring. At the same time, a substantially annular groove that communicates the inflow port and the outflow port is formed on the surface in contact with the ironing die.
Further, the ironing die module has O-rings interposed between the outer side and the inner side of the annular groove on the surface where the water ring and the ironing die contact each other.
The tool pack structure of the present invention has a structure in which an annular water ring is fitted to the outer peripheral surface of a flanged tubular redraw die, and is provided with a temperature-controlled water inlet and outlet at positions adjacent to the water ring, A redraw die module having a substantially annular groove communicating with the inflow port and the outflow port is formed at the end of the surface of the redraw die that is in contact with the outer peripheral surface of the pipe. The ironing die module is arranged so as to be in contact with the redraw die module, and the above-mentioned ironing die modules are connected in a plurality of stages with a die spacer interposed therebetween.
Further, the seal structure of the tool pack structure is such that an O-ring is interposed between the surface where the water ring and the flange of the redraw die are in contact and the end of the water ring which is in contact with the outer peripheral surface of the redraw die.

Since the ironing die module of the present invention has a structure in which a flat ring-shaped ironing die is sandwiched by disk-shaped water rings in which substantially annular grooves are formed from both sides thereof, Patent Document 2 proposes. Instead of the small grooves formed in the die itself, grooves that can be made larger as needed can be arranged on both sides of the die. As a result, the area in which the die can come into contact with the temperature-controlled water can be increased, and highly efficient heat exchange is possible. And since it is the structure which provides a temperature-controlled water inflow port and an outflow port in the water ring exposed to the external environment, it was not necessary to form a complicated flow path, and the temperature-controlled water flow path could be secured with a clean and simple structure.
In addition, the ironing die module has O-rings on the outer and inner sides of the annular groove on the surface where the water ring and the ironing die are in contact with each other. It was.

In the tool pack structure of the present invention, the redraw die module is disposed at an end, the above-described ironing die module is disposed so as to contact the redraw die module, and the above-described ironing die module is disposed with a die spacer interposed therebetween. Since a structure in which a plurality of stages are connected is adopted, it can be assembled by simply connecting them in the axial direction without complicatedly incorporating each member constituting each module like the one presented in Patent Document 2 above. is there. Moreover, it is excellent in the easiness in member manufacture and the simplicity in member assembly.
The redraw die module of the present invention has a structure in which an annular water ring is fitted to the outer peripheral surface of a flanged tubular redraw die, and a substantially annular groove is formed on the surface of the water ring in contact with the outer peripheral surface of the pipe. As a result, a groove that can be taken as large as necessary can be arranged on the outer peripheral surface of the die, thereby enabling highly efficient heat exchange. In addition, since the temperature control water inlet and outlet are provided in the water ring exposed to the outside world, there is no need to form a complicated flow path, and the temperature control water flow path is secured with a simple structure even in the redraw die module. did it.

Also, the seal structure of the tool pack structure of the present invention is such that the redraw die module has an O-ring on the surface where the water ring and the flange of the redraw die are in contact, and on the end of the water ring which is in contact with the outer peripheral surface of the redraw die. Because of this, we were able to avoid worrying about water leakage from this part.

An embodiment of a tool pack structure according to the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a sectional view in the axial direction of a tool pack structure. A redrawing die 1 for redrawing is followed by a first drawing die 5a at the right end, and then a second ironing die 5b through a die spacer 11. However, the third ironing die 5c and the fourth ironing die 5d are arranged in succession via the die spacer 11 to form the tool pack structure T. The length of the die spacer arranged between adjacent ironing dies becomes longer as it goes to the left because the height of the can becomes longer each time ironing is performed by the ironing die. . The redraw die 1 is made of super hard sintered material such as tungsten carbide or tool steel, and is formed into a flanged tube shape. The orifice that acts as the die for drawing is the inner surface of the tube near the end opposite to the flange. To form. An annular water ring 2 is fitted to the outer peripheral surface of the pipe so as to form a temperature adjusting water passage so as to contact the outer peripheral surface of the pipe of the redraw die 1 in order to cool the processed part accompanied by heat generation, and the end portion is connected to the flange surface It is bolted in the form of contact and is integrally structured as a redraw die module. As understood from the AA sectional view shown in FIGS. 1 and 2, the water ring 2 has a U-shaped groove as a temperature adjusting water passage 3 formed on the inner peripheral surface of the ring over substantially the entire peripheral surface. One end of the groove is formed with an inflow port 3a in the radial direction, and the other end is formed with an outflow port 3b in the radial direction. The inflow port 3a and the outflow port 3b are arranged at a substantially 360 ° positional relationship, that is, close to each other for cooling the entire peripheral surface, and are connected to the same manifold 9 for water supply and drainage. As a liquid sealing means, an O-ring 12 is interposed between a surface where the water ring 2 and the flange of the redraw die 1 are in contact and an end portion side of the water ring 2 which is in contact with the outer peripheral surface of the redraw die 1.
This cooling structure has a very simple flow path as compared with the one presented in Patent Document 2, and the manufacture and assembly of the constituent members are extremely easy. In addition, the die cooling area and the flow path diameter can be increased corresponding to the required flow rate, and the cooling efficiency can be increased.

Next, regarding the structure of the ironing die module, the structures of the ironing die modules from the first to the fourth basically take the same form. The ironing dies 5a, 5b, 5c, and 5d are made of ultra-hard sintered material such as tungsten carbide or tool steel, and the overall shape is formed like a flat plate orifice. The processed part of the die is at the center of the hole. Is formed. In order to absorb heat generated by processing, annular water rings 4 and 6 are overlapped so as to sandwich the flat ironing die from both sides and bolted to cool the side surface of the die near the processing part from both sides. ing. That is, the front water ring 4, the ironing die 5, and the rear water ring 6 are bolted to form an integral structure as an ironing die module. Since the water rings 4 and 6 basically have the same form, the structure thereof will be described by taking the rear water ring 6 of the fourth ironing die module shown in FIG. 1 as an example. As understood from the BB cross-sectional views of FIGS. 1 and 3, a U-shaped groove as a temperature adjusting water passage 8 is formed in a substantially annular shape on the side surface on the side where the water ring is in contact with the ironing die, One end of the groove is formed with an inflow port 8a in the radial direction, and the other end is formed with an outflow port 8b in the radial direction. The inflow port 8a and the outflow port 8b are disposed at a substantially 360 ° positional relationship, that is, close to each other in order to cool the entire peripheral surface, and are connected to the same manifold 10 for water supply and drainage. In addition, the ironing die has a structure in which cooling by the temperature adjusting water passage 7 of the front water ring is also performed at the same time, and the inlet 7a and the outlet 7b are also connected to the same manifold 10 so that water can be supplied and discharged. It has become. That is, the manifold connected to each ironing die module has a structure in which branch water supply to the two inlets 7a and 8a and combined drainage from the two outlets 7b and 8b are performed. As a liquid sealing means, O-rings were respectively interposed on the outer and inner sides of the annular grooves 7 and 8 on the surface where each of the water rings 4 and 6 and the ironing die 5 contact.
Compared to the one shown in Patent Document 2, this cooling structure has a very simple flow path without the need for forming a flow path inside the member, and the manufacture and assembly of the constituent members are extremely easy. . Further, the cooling area of the die and the flow path diameter can be increased corresponding to the required flow rate, and the cooling efficiency can be increased.

1 is an axial cross-sectional view of one embodiment of a tool pack structure according to the present invention. It is an AA section sectional view of one example of a tool pack structure concerning the present invention. It is sectional drawing of the BB part of one Example of the tool pack structure which concerns on this invention. It is a figure explaining the conventional tool pack structure provided with the cooling function, and is an axial sectional view of the whole structure. It is a figure explaining the temperature control water flow path of the ironing die housing | casing in the conventional tool pack structure, and its flow. It is a figure explaining the well-known process of shape | molding a can by drawing and ironing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Redraw die 2 Water ring 3 Temperature control water passage 4 Water ring 5a, b, c, d Ironing die 6 Water ring 7 Temperature control water passage 7a, 8a Inlet 8 Temperature control water passage 7b, 8b Outlet 9 Manifold 10 Manifold 11 Die spacer 12 O-ring T Tool pack structure

Claims (4)

  A flat ring-shaped ironing die is sandwiched from both sides by a disk-shaped water ring. The water ring is provided with a temperature-controlled water inlet and outlet at positions close to each other, and on the surface in contact with the ironing die. Is an ironing die module having a cooling function in which a substantially annular groove is formed to communicate the inlet and the outlet.   2. The sealing structure of an ironing die module according to claim 1, wherein an O-ring is interposed between an outer side and an inner side of the annular groove on a surface where the water ring and the ironing die contact each other. An annular water ring is fitted to the outer peripheral surface of a flanged tubular redraw die, and the water ring is provided with a temperature-controlled water inlet and outlet at positions adjacent to the water ring, and a surface in contact with the outer peripheral surface of the redraw die The redraw die module according to claim 1, wherein a redraw die module having a cooling function in which a substantially annular groove communicating with the inflow port and the outflow port is formed is disposed at an end portion. A tool pack structure in which the ironing die modules according to claim 1 are connected in a plurality of stages with a die spacer interposed therebetween. The seal structure of the tool pack structure according to claim 3, wherein an O-ring is interposed between a surface where the water ring and the flange of the redraw die are in contact and an end portion side of the water ring which is in contact with the pipe outer peripheral surface of the redraw die.

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