JP2006068785A - Die device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a die device for forming an offset fine stably and at high speed. <P>SOLUTION: This device is a die device for forming the offset fin on a sheet material 1 to be worked by conveying the sheet material 1 to be worked in a fixed direction in the press machine 4 and has a preliminarily bending part 50 for forming a waveform on the sheet material 1 to be worked, an offset cutting part 60 which is arranged on the downstream side in the conveying direction of the sheet material 1 to be worked in the preliminarily bending part 50 and cutting the offset part by cutting an opposite slope of the slope of the waveform of the sheet material 1 to be worked in zigzag and an offset fin forming part 70 which is arranged on the downstream side in the conveying direction of the sheet material 1 to be worked in the offset cutting part 60 and by which the offset fin is formed on the sheet material 1 to be worked cut in the offset part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a mold apparatus for forming an offset fin by pressing a thin plate material. In particular, the process of forming an offset fin is divided into a plurality of steps to stably form an offset fin. It is related with the metal mold | die apparatus which can perform.

  An offset fin is a wave-shaped fin, which is a fin formed in a zigzag pattern in which the peaks and valleys in the plate width direction are shifted by a half mountain in the plate width direction at every predetermined pitch in the plate width direction. Etc. are used for heat exchangers.

  This offset fin is generally formed by press working with a mold apparatus. In the conventional mold apparatus, as shown in FIG. 10 (a), the processing unit 101 performs the process of cutting the offset portion at the same time while pushing the thin plate material into the die with the upper die punch and bending it into the shape of the offset fin. There is a mold device to perform. Further, as shown in FIG. 10B, there is a mold apparatus in which an offset portion is cut in advance by a first processing portion 102 and then the second processing portion 103 performs a process of bending into an offset fin shape.

Further, as another offset fin manufacturing apparatus, an apparatus using a YAG laser for cutting an offset portion has been proposed (for example, see Patent Document 1).
JP-A-10-58240

  However, in the process of cutting the offset portion at the same time while bending into the shape of the offset fin, the plate thickness of the processed thin plate material is greatly reduced, and the processed thin plate material may be damaged. Therefore, in order to prevent damage to the processed thin plate material, the processing speed must be greatly reduced.

  Moreover, since it is the process which cuts a to-be-processed thin plate material, a lot of fine chips generate | occur | produce, and time and an effort will be required for washing | cleaning of the to-be-processed thin plate material in a post process.

  In addition, in the process of cutting the offset part in advance and bending it into the shape of the offset fin, if the lot of the thin plate material to be processed changes, the composition and thickness of the thin plate material to be processed will change somewhat. Even if it performs, the pitch of an offset fin will vary. As a result, it is not possible to manufacture an offset fin having a desired external accuracy.

  In addition, in the offset portion cutting by the YAG laser, it takes time to cut the thin plate material to be processed, so that the processing speed is also slowed down. Further, the apparatus is complicated and expensive as compared with the case where the apparatus is configured only by a mold.

  The present invention has been made to solve such a conventional problem. By dividing the offset fin formation process into a plurality of stages, the offset fin can be formed stably and at high speed. An object of the present invention is to provide a mold apparatus that can be used.

  The invention according to claim 1 of the present application is a mold apparatus that conveys a work sheet material in a certain direction in an apparatus, and forms offset fins in the work sheet material, wherein the work sheet material is corrugated. A pre-bending portion to be formed, an offset cutting portion that is arranged downstream of the pre-bending portion in the conveying direction, and cuts the wavy slope of the thin sheet material to be processed in a staggered manner; and downstream of the offset cutting portion in the conveying direction And a bending device that is disposed and forms an offset fin in the workpiece thin plate material.

  According to the mold apparatus of the present invention, by dividing the offset fin into a plurality of processes and performing processing, the burden at the time of processing on the thin plate material to be processed is reduced, and the volatile property which is inferior in lubricity but does not require cleaning. Even if processing is performed with oil attached, the reduction of the thickness of the thin plate material to be processed is suppressed, and the bent portion is not cracked, and production can be performed at a processing speed several times the conventional speed. And since volatile oil can be used, the trouble of washing of a workpiece is saved, and it meets the needs of the environment.

  Further, since the burden on the mold is reduced, the frequency of maintenance of the mold is reduced, and the time and cost required for maintenance can be saved. Furthermore, the amount of chips produced during the tearing process is reduced, and the frequency of cleaning the thin plate material to be processed and the mold can be reduced, and stable production can be achieved. In addition, since the change in dimension in the conveying direction of the thin plate material to be processed is small, stable production with a progressive die apparatus is possible.

  Hereinafter, a mold apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

  In this embodiment, the processing which forms an offset fin with the progressive die apparatus is performed to a to-be-processed thin-plate material (workpiece | work). A progressive mold apparatus is a process in which a plurality of steps are arranged in order at a predetermined pitch in the same mold apparatus, and the feed apparatus feeds the material by one pitch for each stroke of the press machine. A device that sequentially feeds workpieces to a process. The workpiece is continuously supplied by the supply device, and the processed product is sequentially discharged from the progressive die device by continuous automatic operation.

  FIG. 1 is a schematic configuration diagram of a mold apparatus according to the present embodiment. Reference numeral 1 denotes a work such as an aluminum plate or a stainless steel plate wound around a reel or the like.

  Reference numeral 2 denotes an unwinding device for stocking the workpiece 1. 3 is a progressive device for supplying the work 1 wound up by the unwinding device 2 to the press 4. The sequential feeding device 3 has a sequential feeding function for supplying the material into the press machine 4 in a mode such as pitch feeding or constant speed feeding. In the mold apparatus of the present embodiment, known apparatuses are used as the unwinding apparatus 2, the progressive apparatus 3, and the press machine 4.

  The press machine 4 includes a processing unit 4a that performs processing to form offset fins on the workpiece 1, and an upper die 20 and a lower die 30 that constitute a mold apparatus are attached to the processing unit 4a. And the workpiece | work 1 is supplied by the progressive feeder 3 between the upper mold | type 20 and the lower mold | type 30 of the process part 4a, and press work is performed.

  The lower die 30 is fixed to the processing part 4 a of the press machine 4. The upper die 20 is attached to a crank (not shown) of the press machine 4 and moves up and down. When the workpiece 1 is processed, the upper die 20 is lowered to the press position (bottom dead center), and the workpiece 1 is sandwiched between the upper die 20 and the lower die 30 to perform press working.

  FIG. 2 is a side view of the upper mold 20 and the lower mold 30 of the mold apparatus according to the present embodiment. The upper die 20 has reached the bottom dead center and is in a state of being pressed. In the mold apparatus of the present embodiment, a pre-bending portion 50, an offset cutting portion 60, and an offset fin forming portion 70, which will be described later, are arranged in order from the upstream in the workpiece conveyance direction.

  FIG. 3 is a configuration diagram of the upper mold 20 used in the mold apparatus of the present embodiment. The upper mold 20 is provided with a pre-bending punch 21, an offset cutting punch 22, and an offset fin forming punch 23 in order from the upstream in the conveying direction of the work 1. The stripper plate 24 clamps and fixes the workpiece 1, and the punches 21 to 23 protrude from the lower surface of the stripper plate 24 to press the workpiece 1.

  FIG. 4 is a configuration diagram of the lower mold 30 used in the mold apparatus of the present embodiment.

  The lower mold 30 is provided with a pre-bending die 31, an offset cutting die 32, and an offset fin forming die 33 in order from the upstream in the conveying direction of the workpiece 1.

  As shown in FIG. 2, the preliminary bending die 31 and the preliminary bending punch 21 constitute a preliminary bending portion 50, and the offset cutting die 32 and the offset cutting punch 22 constitute an offset cutting portion 60 to form an offset fin. The die 33 and the offset fin forming punch 23 constitute an offset fin forming portion 70.

  The upper mold 20 and the lower mold 30 have a holding part (punch plate, die plate, case, retainer, etc.), auxiliary part (stripper, gauge, cushion, pressure, etc.), positioning part (locate pin, guide pin, guide bush). Etc.) is provided with a known mold mechanism.

  FIG. 5 is a detailed view of the pre-bending portion 50 of the mold apparatus according to the present embodiment. By pressing the work 1 with the pre-bending die 31 and the pre-bending punch 21, a process for forming a waveform on the work 1 is performed.

  The tip of the pre-bending punch 21 has a substantially U-shaped cross section, and is configured by a curve having a predetermined curvature. The shape of the pre-bending die 31 is a groove having a substantially U-shaped cross section, and is configured by a curve having a clearance about the thickness of the workpiece 1 with respect to the shape of the pre-bending punch 21. An entrance portion having a predetermined curved portion is formed in the upper portion of the groove of the pre-bending die 31.

  The reason why the shapes of the pre-bending punch 21 and the pre-bending die 31 are substantially U-shaped curves is to prevent stress concentration from occurring in the work 1 during pre-bending, and to prevent cracking and breakage of the work 1. . Further, when the workpiece 1 is deformed from a flat plate shape to a corrugated shape during the pre-bending process, the drawing of the workpiece having a length necessary for forming the corrugated shape occurs in the pre-bending portion 50. By this drawing, sliding friction with the workpiece 1 occurs at the workpiece entrance side of the preliminary bending die 31 and the tip of the preliminary bending punch 21. In order to reduce this frictional force and make it easier for the workpiece 1 to be drawn into the preliminary bending portion 50, each portion such as the pre-bending punch 21 and the entrance portion of the preliminary bending die 31 is configured with a smooth curve.

  The pitch of the waveform formed on the workpiece 1 in the preliminary bending portion 50 is substantially the same as the pitch of the offset fins finally formed. As a result, subsequent processing of the workpiece 1 can be performed progressively at this pitch. The waveform pitch is adjusted by setting the feed pitch of the progressive feed device 3.

  Further, the height of the waveform formed on the workpiece 1 is preferably substantially the same as or slightly higher than the height of the offset fin that is finally formed. This makes it difficult for the workpiece to be drawn into the machined part in a later process, which will be described later, and makes it difficult for the waveform pitch to shift. Specifically, the height of the substantially U-shaped groove of the preliminary bending die 31 is configured to be substantially the same as or slightly higher than the height of the offset fin.

  FIG. 6 is an operation diagram of the mold during the pre-bending process of the mold apparatus according to the present embodiment. Fig.6 (a) is a figure which shows the metal mold | die of the pre-stage of a preliminary | backup bending process. When the upper die 20 is lowered, first, the stripper plate 24 urged downward by the spring 52 comes into contact with the workpiece 1, and the workpiece 1 is sandwiched and fixed by the stripper plate 24 and the lower die 30.

  A work pressing piece 51 is provided on the stripper plate 24. The work holding piece 51 is formed with a waveform that fits the waveform of the work 1 formed by the preliminary bending portion 50. Further, the lower mold 31 is also formed with a waveform having a clearance about the thickness of the workpiece 1 with respect to the waveform of the workpiece pressing piece 51. The workpiece holding piece 51 is provided adjacent to a position downstream of the preliminary bending processing position in the workpiece conveyance direction, and the workpiece 1 is sandwiched between the workpiece holding piece 51 and the lower mold 30 to perform preliminary bending processing. Sometimes, the workpiece 1 is prevented from being pulled back to the preliminary bending portion 50 upstream in the conveying direction.

  FIG.6 (b) is a figure which shows the metal mold | die at the time of a pre-bending process. The upper mold 20 further descends and reaches the bottom dead center. At this time, the upper die 20 is further subtracted by the workpiece holding amount L5, and the preliminary bending punch 21 attached to the upper die 20 so as to be slidable with the stripper plate 24 protrudes from the lower surface of the stripper plate 24, and the workpiece 1 is removed. Press and pre-bend.

  At this time, the work 1 is pulled into the pre-bending portion 50 along with the deformation of the work 1 by the pre-bending process. However, since the downstream portion in the transport direction of the work 1 is sandwiched by the work pressing piece 51, the work Only the upstream portion in the transport direction of 1 is drawn and processed. As a result, the portion of the workpiece 1 on which the waveform is already formed is not drawn into the preliminary bending portion 50 again, and the occurrence of a shift in the waveform pitch due to the reworking can be prevented.

  After this press work, the work 1 is pitch-fed by the length of the corrugated pitch, and further, by press work, a waveform is formed at the next position on the work 1, and thereafter, the waveform is continuously formed.

  By providing the pre-bending portion 50 and forming the waveform on the workpiece 1 in advance, the fluctuation in the dimension of the workpiece 1 in the conveyance direction in the subsequent machining process can be suppressed, and stable offset fin machining can be performed in the subsequent process. Become. And since the fluctuation | variation of the dimension of the conveyance direction of the workpiece | work 1 is small, the pitch feed of the workpiece | work can be performed stably, and it is suitable for the process by a progressive die apparatus.

  In addition, since it is pre-bent, processing with low bending resistance is possible during offset fin formation processing, and even for materials with low tensile strength, there is little reduction in plate thickness and low risk of workpiece damage. Formation processing is possible.

  FIG. 7 is a detailed view of the offset cutting unit 60 of the mold apparatus according to the present embodiment. FIG. 7A is a perspective view of the offset cutting part 60. The offset part is cut by pressing the workpiece 1 with the offset cutting punch 22 and the offset cutting die 32.

  The offset cutting punch 22 is configured by alternately combining the punch 22a and the punch 22b in a direction perpendicular to the workpiece conveyance direction. The shapes of the tips of the punch 22a and the punch 22b are configured by combining two surfaces in a substantially chevron shape before and after the conveyance direction. Then, a convex curved surface 22c is formed on one surface of the chevron so as to mesh with the slope of the corrugated valley of the workpiece 1 serving as a cutting portion, and the other surface has a waveform formed on the workpiece 1 during pressing. A slope 22d that does not interfere is formed.

  Further, a relief portion 22e formed of a curved surface that does not interfere with the top portion of the corrugation formed on the workpiece 1 is provided at the top of the peak of the offset cutting punch 22 during pressing. The widths of the tip portions of the punch 22a and the punch 22b are substantially the same as the width of the offset fin formed on the workpiece 1.

  And the punch 22a and the punch 22b are alternately arrange | positioned so that the curved surface 22c which is a cutting | disconnection part may face a mutually reverse direction.

  With this configuration, the offset cutting punch 22 turns the cutting portions 22c alternately on one surface and the other surface of the offset cutting punch 22 and at substantially the same pitch as the offset fins formed on the workpiece 1.

  The offset cutting die 32 is configured by combining a die 32a and a die 32b so as to face each other. In the die 32a, a support portion 32c having a curved surface capable of supporting a wave-shaped slope formed on the workpiece 1 and an escape portion 32d that does not interfere with the waveform of the workpiece 1 during pressing are alternately arranged at a predetermined pitch. Is provided.

  In addition, a relief portion 32e formed of a curved surface that does not interfere with the waveform of the workpiece 1 is provided at the top of the support portion 32c. The width of the support portion 32c and the relief portion 32d is substantially the same as the width of the offset fin formed on the workpiece 1.

  Similarly, support portions 32c and relief portions 32d having the same shape as the die 32a are alternately provided on the die 32b.

  The die 32a and the die 32b are combined with the support portion 32c and the escape portion 32d facing each other to constitute the offset cutting die 32.

  FIG.7 (b) is a front view of an offset cutting part.

  Due to the presence of the relief portion 22e of the offset cutting punch 22 and the relief portion 32e of the offset cutting die 32, the peak portion 60a and the valley bottom portion 60b are in contact with the waveform formed on the workpiece 1 during pressing. There is no. A certain uncut portion remains on the workpiece 1 due to the escape portion. This portion that is not cut becomes a portion that connects adjacent offset fins when forming offset fins in a later step.

  At the bottom dead center of the press, the curved surface 22c of the cutting portion of the offset cutting punch 22 enters the escape portion 32d of the offset cutting die 32 so that the offset cutting punch 22 and the offset cutting die 32 are engaged with each other. Then, the opposite slopes of the corrugated slope of the workpiece 1 are cut in a zigzag pattern to form a cut portion in the workpiece 1.

  Since the offset cutting punch 22 has the curved surface 22c of the cutting portion at alternating positions of the front surface and the back surface, the cutting portions are formed in a staggered manner at alternating positions of the opposing surfaces of the waveform of the workpiece 1. .

  After this press work, the work 1 is pitch-fed, and further, the press part performs the cutting process of the offset portion at the next position on the work 1, and thereafter the cutting process is continuously performed.

  By providing the offset cutting part 60 and performing the cutting of the offset part in an independent process, the process of tearing the offset part simultaneously with the formation of the offset fin as in the conventional processing method is eliminated. As a result, an excessive load is not applied to the workpiece during pressing, and the possibility of the workpiece being damaged is reduced. In addition, the amount of cutting waste is reduced, and the labor of cleaning the mold and workpiece can be saved. In addition, since the load on the mold is reduced, the life of the mold is extended. For this reason, the labor for maintenance can be reduced, and at the same time, the replacement cost of the mold can be reduced.

  Further, since the resistance to the workpiece 1 at the time of offset cutting becomes low, a small amount of processing oil is sufficient. And it becomes possible to use volatile oil which has low lubricity but does not require cleaning. Further, since the cutting resistance is lowered, the processing speed can be increased, and the production amount of offset fins per unit time can be increased.

  FIG. 8 is a detailed view of the offset fin forming portion 70 of the mold apparatus according to the present embodiment.

  In the main forming portion 70, the work 1 is pressed by the offset fin forming punch 23 and the offset fin forming die 33 to perform processing for forming the offset fin.

  In the offset forming punch 23, the punch portion 23a and the punch portion 23b having a substantially rectangular cross section of the same shape are shifted by a predetermined length in the width direction of the offset forming punch 23, which is the workpiece conveying direction. Are alternately arranged in the longitudinal direction of the offset forming punch 23 which is a direction perpendicular to the vertical direction. The widths of the punch part 23a and the punch part 23b are substantially the same as the widths of the fins formed in a staggered pattern shifted by a half mountain in the plate width direction of the offset fins formed on the workpiece 1.

  The offset forming die 33 is configured by combining a die 33a and a die 33b so as to face each other. The die 33 a has a comb-shaped cross section, and is provided with support portions 33 c that can support the workpiece 1 and escape portions 33 d that do not interfere with the offset forming punch 23. Further, the widths of the support portion 33c and the relief portion 33d are substantially the same as the widths of the fins formed in a staggered pattern shifted by a half mountain in the plate width direction of the offset fin.

  Similarly, the die 33b has a comb-shaped cross section, and support portions 33c and relief portions 33d having the same shape as the die 33a are alternately provided.

  The die 33a and the die 33b are combined with each other such that the support portion 33c and the escape portion 33d face each other at a predetermined interval to constitute the offset forming die 33.

  The offset forming punch 23 and the offset forming die 33 have a cross-sectional shape and an interval between the dies 33a and 33b so that a clearance of about the thickness of the workpiece 1 is generated at the time of fitting. At the bottom dead center of the press, the offset forming punch 23 enters the escape portion 33d of the offset forming die 33 by the height of the offset fin, so that the offset forming punch 23 and the offset forming die 33 are engaged with each other. 1 is formed with an offset fin.

  After this press work, the workpiece 1 is pitch-fed by a predetermined length, and further, offset fins are formed at the next position by press work, and thereafter, offset fins are continuously formed.

  Since the preliminary bending has already been performed and the offset portion has been cut, it is possible to perform processing with low bending resistance during the offset fin formation processing. Further, even with a material such as aluminum having a low tensile strength, it is possible to form an offset fin with little reduction in plate thickness and low risk of workpiece damage.

  In the conventional offset fin forming process, the plate thickness reduction rate is 7 to 8%, and further, the plate thickness reduction rate is about 20% in a portion where there is a local constriction. On the other hand, in the forming process of the offset fin of this embodiment, the plate thickness reduction rate is about 2%, and no local plate thickness reduction occurs.

  FIG. 9 is a view showing a workpiece 1 processed by the mold apparatus of the present embodiment. The sheet-like workpiece 1 supplied from the progressive feeding device 3 is pitch-fed through the press 4 so that the processing proceeds from the upstream side of the workpiece 1 as shown in the figure.

  The work 1 supplied by the progressive device 3 first reaches the pre-bending portion 50 of FIG. 2 and is pre-bent into a wavy shape. Next, pitch feed is performed and the offset cutting part 60 is reached. In the offset cutting part 60, after the offset part is cut, the pitch is further fed to reach the offset fin forming part 70. In the offset fin forming part 70, the offset fin is formed, and the machining process is completed.

  In progressive die processing, the dimensions of the workpiece in the transport direction change as the plate is deformed by processing. As a result, there is a possibility that the pitch of the workpiece is shifted during conveyance. In order to prevent pitch deviation, a workpiece processed by a conventional progressive die apparatus is provided with positioning pilot holes at both ends of the workpiece. However, the material of the portion provided with the pilot hole is not processed and is eventually discarded, resulting in a waste of material. In the mold apparatus according to the present embodiment, since there is little change in the dimension of the workpiece in the conveyance direction, it is not necessary to provide pilot holes in the workpiece, and the material can be processed without waste.

  As described above, according to the present embodiment, the work load on the workpiece is reduced, and the workpiece thickness is reduced even when processing is performed with volatile oil that has poor lubricity but does not require cleaning. Can be produced at a processing speed several times the conventional speed without cracking in the bent part. Since volatile oil that is inferior in lubricity but does not require cleaning can be used, it eliminates the hassle of cleaning workpieces and meets environmental needs.

  In addition, since the burden on the mold is reduced, the frequency of maintenance of the mold is reduced, and the time and cost for maintenance can be saved. Furthermore, the amount of chips generated during the tearing process is reduced, the frequency of cleaning the thin plate material to be processed and the mold can be reduced, and stable production can be achieved. In addition, since the change in the dimension of the workpiece in the conveyance direction is small, stable production with a progressive die apparatus is possible.

  The embodiment described above is implemented with various changes and improvements.

  Examples of the present invention are shown below.

Example 1
The material was made of aluminum (JIS standard: A3003), a workpiece having a width of 190 mm and a plate thickness of 0.1 mm to form offset fins. In the preliminary bending portion, preliminary bending with a corrugated pitch of 3 mm and a corrugated height of 1.95 mm is performed, and in the cutting portion, the offset portion is cut at intervals of 1 mm. In the offset fin forming portion, the height of the offset fin An offset fin having a pitch of 1.55 mm and an offset fin pitch of 3 mm was formed. In addition, the oil used during processing was replaced with a squeezed oil having high lubricity, and a volatile oil having poor lubricity but not requiring washing was used.

  In this example, the processing speed can be increased from the conventional speed of 80 spm to 500 spm. In addition, the life of the mold (interval for performing the blade grinding) greatly increased from 60 million to 80 million shots compared to the conventional 1 million to 1.2 million shots.

(Example 2)
The material was made of aluminum (JIS standard: A3003), a workpiece having a width of 220 mm and a plate thickness of 0.3 mm to form offset fins. In the preliminary bending portion, preliminary bending with a corrugated pitch of 3.9 mm and a corrugated height of 6 mm is performed, and in the cutting portion, the offset portion is cut at intervals of 3 mm. In the offset fin forming portion, the height of the offset fin An offset fin having a pitch of 6 mm and an offset fin of 3.1 mm was formed. In addition, the oil used during processing was replaced with a squeezed oil having high lubricity, and a volatile oil having poor lubricity but not requiring washing was used.

  In this embodiment, the processing speed can be increased from the conventional speed of 130 spm to 600 spm. In addition, the life of the mold (interval for performing the blade grinding) greatly increased from 60 million to 80 million shots compared to the conventional 1 million to 1.7 million shots.

(Example 3)
The material was made of aluminum (JIS standard: A3003), a workpiece having a width of 230 mm and a plate thickness of 0.5 mm to form offset fins. In the preliminary bending portion, preliminary bending with a corrugated pitch of 4.7 mm and a corrugated height of 4 mm is performed, and in the cutting portion, the offset portion is cut at intervals of 4 mm. In the offset fin forming portion, the height of the offset fin An offset fin having a thickness of 3.2 mm and an offset fin pitch of 4.7 mm was formed. In addition, the oil used during processing was replaced with a squeezed oil having high lubricity, and a volatile oil having poor lubricity but not requiring washing was used.

  In this embodiment, the processing speed can be increased from the conventional speed of 100 spm to 600 spm. In addition, the life of the mold (interval for performing blade grinding) greatly increased from 50 million to 60 million shots compared to the conventional 600,000 shots.

Example 4
The material was stainless steel (JIS standard: SUS316), a workpiece having a width of 60 mm and a plate thickness of 0.1 mm was processed to form offset fins. In the preliminary bending portion, preliminary bending with a corrugated pitch of 2.1 mm and a corrugated height of 0.92 mm is performed, and in the cutting portion, the offset portion is cut at intervals of 0.5 mm, and in the offset fin forming portion, the offset is offset. An offset fin having a fin height of 0.7 mm and an offset fin pitch of 2.1 mm was formed. Moreover, the oil used at the time of processing used the normal stainless steel processing oil.

  In the present embodiment, it has become possible to process a stainless steel, which conventionally cannot form an offset fin, at a processing speed of 400 spm. In addition, since the die has a life of 15 million shots (interval for bladed grinding), it has become possible to stably form offset fins on a stainless steel material.

It is a schematic block diagram of the metal mold apparatus of this embodiment. It is a side view of the upper mold | type 20 and the lower mold | type 30 of the metal mold apparatus of this embodiment. It is a block diagram of the upper mold | type 20 used for the metal mold apparatus of this embodiment. It is a block diagram of the lower mold | type 30 used for the metal mold apparatus of this embodiment. It is detail drawing of the pre-bending part 50 of the metal mold apparatus of this embodiment. It is an operation | movement figure of the metal mold | die at the time of the preliminary | backup bending process of the metal mold apparatus of this embodiment. It is detail drawing of the offset cutting part 60 of the metal mold apparatus of this embodiment. It is detail drawing of the offset fin formation part 70 of the metal mold apparatus of this embodiment. It is a figure showing the workpiece | work 1 processed with the metal mold apparatus of this embodiment. It is a figure showing the workpiece processed by the conventional metal mold apparatus.

Explanation of symbols

1: Thin plate material to be processed 4: Press device 50: Preliminary bending section 60: Offset cutting section 70: Offset fin forming section

Claims (3)

A mold device that forms an offset fin by processing a thin plate material in stages while conveying a thin plate material to be processed in a fixed direction,
A pre-bending portion for sequentially forming a waveform having a predetermined shape at a predetermined pitch in the conveying direction on the thin plate material to be processed;
An offset cutting part that is disposed downstream of the pre-bending part in the conveying direction of the processed thin plate material, and that forms a cutting part in a staggered manner on the opposing slopes of the corrugated slope of the processed thin plate material;
An offset fin forming portion that is disposed downstream of the offset cutting portion in the conveying direction of the processed thin plate material, and that forms offset fins on the processed thin plate material from which the offset portion has been cut;
A mold apparatus characterized by comprising: 2. The mold apparatus according to claim 1, further comprising a sandwiching portion that sandwiches the processed thin plate material downstream of the preliminary bending portion in the conveying direction of the processed thin plate material.   The mold apparatus according to claim 2, wherein the clamping portion is adjacent to the preliminary bending portion.

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