JP2007186763A - Method for restoring metal mold for molding honeycomb structure and metal mold restored thereby - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for restoring a metal mold for molding a honeycomb structure, which method can easily and precisely restore a metal mold having excellent durability and abrasion resistance, and to provide a metal mold restored thereby. <P>SOLUTION: A method is provided for restoring a metal mold 1 which has a material feed hole 12 and a slit groove 13 provided in the form of a grid communicating with the hole 12 and used for molding a material into a honeycomb shape, has an area worn by repeated use, and is used for molding a honeycomb structure from the material. In the method, a CVD treatment is carried out on a groove-forming surface 130 which is the front face in the extrusion direction of a metal mold body 11 with the formed slit groove 13 and the worn area 19 at the corner 14 formed by intersection between the groove-forming surface 130 and the inner side surface 131 of the slit groove 13 to form a CVD restored film 21 thereon. After the above process, a PVD treatment is carried out on the CVD restored film 21 formed on the groove-forming surface 130 and the worn area at the corner 14 by feeding a film-forming material from the side of the groove-forming surface 130 to form a PVD restored film 22 thereon. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for regenerating a honeycomb structure forming mold for extruding a honeycomb structure, and a regenerated mold regenerated using the regeneration method.

For example, a ceramic honeycomb structure used as an exhaust gas purification filter of an automobile is formed by extruding a material containing a ceramic raw material using a honeycomb structure forming mold (hereinafter, simply referred to as a mold). Manufactured by.
As the mold, a supply hole for supplying a material and a slit groove for forming the material into a honeycomb shape were formed in the mold main body and provided in a lattice shape in communication with the supply hole. Use things.

  When the material is extruded using the mold, the material flowing through the supply hole and the slit groove and the mold body come into contact with each other, and friction is generated. Friction with this material causes wear on the mold body, particularly the inner surface of the narrow slit groove. By repeatedly performing the extrusion molding, the wear part of the mold body is increased, and the dimensional accuracy of the formed honeycomb structure is lowered. In this way, the use of the mold becomes difficult and the life is reached.

  Conventionally, there has been proposed a method of regenerating a die that has reached the end of its life so that it can be used again. For example, there is a method of regenerating the mold by performing a treatment such as electroless nickel plating or hard chrome plating on the worn part of the mold body. However, in this case, there is a possibility that the wear resistance of the portion subjected to the plating treatment may be insufficient.

  Moreover, in order to obtain sufficient wear resistance, there is a method of forming a wear-resistant material on the entire surface of the mold body by a CVD process (see Patent Document 1). However, it is difficult to form a film uniformly on the entire surface of the mold body using the CVD process. Therefore, the dimensional accuracy of the regenerated mold (hereinafter, appropriately referred to as the regenerated mold) becomes insufficient, and a honeycomb structure having a desired dimension may not be formed.

  As described above, in the conventional mold recycling method, it is difficult to reproduce the mold accurately and easily. Moreover, it cannot be said that the regenerated mold has sufficient durability and wear resistance.

Japanese Patent Laid-Open No. 5-269719

  The present invention has been made in view of such conventional problems, and can form a honeycomb structure capable of easily and accurately regenerating a mold and obtaining excellent durability and wear resistance. An object of the present invention is to provide a method for regenerating a metal mold, and a reclaimed mold regenerated by the method.

1st invention has the supply hole for supplying material, and the slit groove | channel which was provided in the grid | lattice form in communication with this supply hole, and shape | molded material into a honeycomb shape, and was worn by use In a method of regenerating a mold for forming a honeycomb structure having
At least a groove forming surface which is a front end surface in the extrusion direction of the mold main body in which the slit groove is formed, and a worn portion of a corner portion formed by intersecting the groove forming surface and the inner side surface of the slit groove. After forming a CVD reproduction film on the top by performing a CVD process,
A film forming material is supplied from the groove forming surface side on the CVD reproducing film formed on the groove forming surface and the worn part of the corner portion, and PVD treatment is performed to form a PVD reproducing film. A method for regenerating a mold for forming a honeycomb structure is characterized in that it is formed.

  In the method for regenerating a mold for forming a honeycomb structure according to the present invention, the CVD regenerated film is formed by a CVD process on at least the groove forming surface and the worn portion of the corner. Then, the PVD reproduction film is formed by PVD treatment on the CVD reproduction film formed on the groove forming surface and the worn portion of the corner. That is, at least the surface on which the material is extruded and the groove forming surface side, which is the most important part that affects the formability and dimensional accuracy of the honeycomb structure, are subjected to both CVD treatment and PVD treatment, Both reproduction films of the CVD reproduction film and the PVD reproduction film are formed.

Thereby, the worn part of the mold can be easily and accurately repaired. And the said metal mold | die which has reached the lifetime can be reproduced | regenerated in the state which can shape | mold the honeycomb structure similar to the case where an initial mold is used. Here, the initial mold is an unused mold.
Further, both the regenerated films formed by the both processes are dense and have high hardness. Then, by forming both of these recycled films on the groove forming surface that is the surface from which the material is extruded and the worn portion of the corner portion where wear easily occurs, the recycled mold is effective. In particular, excellent durability and wear resistance can be obtained.

In addition, the CVD reproduction film formed by the CVD process has high adhesion to the base material (which corresponds to the mold body in the present invention). And since such a CVD reproduction | regeneration film | membrane is formed as a foundation | substrate, the reproduced metal mold | die becomes the thing which was further excellent in durability.
Moreover, the said PVD reproduction | regeneration film | membrane formed by the PVD process has high film-forming precision. And since such a PVD reproduction | regeneration film | membrane is formed in the upper layer of the said reproduction | regeneration film | membrane of the two-layer structure formed in the said groove | channel formation surface side, the reproduced | regenerated metal mold | die becomes a further highly accurate thing. Therefore, the moldability and dimensional accuracy of the honeycomb structure when the regenerated mold is used are further increased.

  In addition, the PVD process can easily form a thick film. Therefore, compared with the conventional case where only a CVD process that is difficult to form a thick film is used, a regenerated film having a sufficient thickness can be easily formed and repaired on the worn portion of the mold. it can. Thereby, the reproduction | regeneration process of the said metal mold | die can be performed efficiently.

  Thus, according to the method for regenerating a mold for forming a honeycomb structure of the present invention, it is possible to regenerate the mold accurately and easily. Then, the regenerated mold has excellent durability and wear resistance.

The second invention has a supply hole for supplying a material and a slit groove provided in a lattice shape in communication with the supply hole and for forming the material into a honeycomb shape, and worn by use In a regeneration mold for forming a honeycomb structure formed by regenerating a mold for forming a honeycomb structure having
At least a groove forming surface which is a front end surface in the extrusion direction of the mold main body in which the slit groove is formed, and a worn portion of a corner portion formed by intersecting the groove forming surface and the inner side surface of the slit groove. Above, a CVD reproduction film formed by performing a CVD process is provided,
A honeycomb structure forming, wherein a PVD regenerated film formed by performing a PVD process is provided on the CVD regenerated film provided on the groove forming surface and the worn part of the corner (7).

  In the regeneration mold for forming a honeycomb structure of the present invention, the CVD regeneration film formed by a CVD process is provided on at least the groove forming surface and the worn portion of the corner. And the said PVD reproduction | regeneration film | membrane formed by PVD process is provided on the said CVD reproduction | regeneration film | membrane provided on the said groove | channel formation surface and the worn part of the said corner | angular part. That is, it has a dense and high hardness formed by both the CVD process and the PVD process on the groove forming surface that is a surface through which the material is extruded and the worn part of the corner part that is easily worn. Both the CVD reproduction film and the PVD reproduction film are provided. For this reason, the reclaimed mold has excellent durability and wear resistance.

In addition, the CVD reproduction film formed by the CVD process has high adhesion to the base material (which corresponds to the mold body in the present invention). And since such a CVD reproduction | regeneration film | membrane is formed as a base | substrate, the said reproduction | regeneration metal mold | die becomes the thing which was further excellent in durability.
Moreover, the said PVD reproduction | regeneration film | membrane formed by the PVD process has high film-forming precision. And since such a PVD reproduction | regeneration film | membrane is formed in the upper layer of both reproduction | regeneration films | membranes formed in the said groove | channel formation surface side, the said reproduction | regeneration metal mold | die becomes a much higher precision. Therefore, the moldability and dimensional accuracy of the honeycomb structure when using the above-described regenerated mold are further increased.

  As described above, according to the present invention, it is possible to provide a regeneration mold for forming a honeycomb structure excellent in durability and wear resistance.

In the first and second inventions, the CVD reproduction film is preferably composed of a single layer or multiple layers of TiC, TiCN, or TiN (claims 2 and 8).
In this case, the CVD reproduction film has high hardness and can improve adhesion to the mold body. Thereby, the said reproduction | regeneration metal mold | die can fully obtain durability and abrasion resistance.

As described above, the CVD reproduction film is formed at least on the groove forming surface and the worn portion of the corner. That is, it is a surface from which the material is extruded, and it is necessarily formed on the groove forming surface side, which is the most important part that affects the formability and dimensional accuracy of the honeycomb structure, and it is not always necessary to form the other part. .
Therefore, after forming the CVD reproduction film on the entire surface including the groove forming surface and the portion other than the worn portion of the corner, the PVD reproduction film is formed only on the groove forming surface and the worn portion of the corner. (See Example 2 described later), or after forming the CVD reproduction film only on the groove forming surface and the corner other than the worn portion, the PVD reproduction film is also formed on the groove forming surface and the corner. It is possible to take a form (see Example 1 described later) that is formed only on the worn part.

Moreover, it is preferable that the said PVD reproduction | regeneration film | membrane is comprised by the single layer or multiple layer of TiN and CrN (Claim 3 and 9).
In this case, the PVD reproduction film has a high hardness. Thereby, the said reproduction | regeneration metal mold | die can fully obtain durability and abrasion resistance.

Further, the PVD reproducing film is preferably formed in a region of 1/10 or less of the depth of the slit groove from the groove forming surface in the depth direction of the slit groove. .
When the PVD reproduction film is formed in a region exceeding 1/10 of the depth of the slit groove, there is a possibility that the groove width of the slit groove varies in the reproduction mold. Therefore, there is a risk that the dimensional accuracy of the honeycomb structure formed using the regeneration mold may be reduced. The PVD regeneration film formation region is the distance in the depth direction of the slit groove from the groove formation surface. That is.

Moreover, it is preferable that the hardness of the said CVD reproduction | regeneration film | membrane and the said PVD reproduction | regeneration film | membrane is 1.5 times or more of the said metal mold body (Claims 5 and 11).
When the hardness of the CVD reproduction film and the PVD reproduction film is less than 1.5 times that of the mold body, the reproduction mold may not be able to obtain sufficient durability and wear resistance.

The hardness of the CVD reproduction film and the PVD reproduction film is preferably 750 HV or more (claims 6 and 12).
When the hardness of the CVD reproduction film and the PVD reproduction film is less than 750 HV, the reproduction mold may not be able to obtain sufficient durability and wear resistance.

Example 1
A method for regenerating a mold for forming a honeycomb structure according to an embodiment of the present invention and a reclaimed mold regenerated by the regenerating method will be described with reference to FIGS.
As shown in FIGS. 1 to 3, the honeycomb structure forming mold 1 is provided in a lattice shape so as to communicate with the supply holes 12 for supplying the material and the supply holes 12, and the material is formed into a honeycomb shape. And a portion worn by use.

And the reproduction | regenerating method of the metal mold | die 1 of this example is the groove | channel formation surface 130 which is the front end surface of the extrusion direction of the metal mold | die body 11 in which the slit groove | channel 13 was formed, as shown in FIGS. A CVD reproduction film 21 is formed by performing a CVD process on the worn portion (wear portion 19) of the corner portion 14 formed by the intersection of the inner surface 131 of the slit groove 13 and the inner surface 131 of the slit groove 13.
Thereafter, a PVD process is performed by supplying a film forming material from the groove forming surface 130 side onto the CVD reproducing film 21 formed on the groove forming surface 130 and the worn portion 19 of the corner portion 14 and performing PVD processing. A film 22 is formed.
This will be described in detail below.

  A mold 1 that is regenerated using the regeneration method of this example is for forming a honeycomb structure by extruding a material containing a ceramic raw material or the like. The mold 1 has a worn portion due to repeated extrusion molding of the material. For this reason, it becomes difficult to form a honeycomb structure having a desired size, and the lifetime has been reached.

As shown in FIGS. 1 and 2, the mold 1 is one in which a supply hole 12 and a slit groove 13 are formed in a mold body 11. The mold body 11 has a hole forming surface 120 in which the supply hole 12 is formed and a groove forming surface 130 in which the slit groove 13 is formed. The hole forming surface 120 is a surface for supplying material to the mold body 11. The groove forming surface 130 is a front end surface in the direction in which the material is pushed out from the mold body 11.
The mold body 11 is made of an SKD material. FIG. 2 shows a part of a general mold 1.

  In addition, as shown in FIG. 3, the mold body 11 has a worn part due to repeated extrusion of the material. In particular, the corner portion 14 formed by the intersection of the groove forming surface 130 and the inner side surface 131 of the slit groove 13 is a portion where wear due to contact with the material is large. In the figure, the initial position of the corner 14 is indicated by a dotted line. That is, the region between the dotted line and the solid line in the figure corresponds to the worn portion 19 that is a portion worn by contact with the material.

  Moreover, as shown in the figure, the depth D of the slit groove 13 of this example is 5 mm. The slit groove 13 has an initial groove width w1 of 140 μm and a lifetime groove width w2 of 150 μm. In addition, the groove width of the slit groove 13 in this example is the maximum dimension of the slit groove 13 on the groove forming surface 130.

Next, the CVD apparatus 4 used for the CVD process will be described.
As shown in FIG. 5, the CVD apparatus 4 has a cylindrical reaction furnace 41 having an open bottom. The reactor 41 has a diameter of 450 mm and a height of 700 mm. A box-type reactor 42 is provided in the reaction furnace 41. In the reactor 42, there is provided a mounting table 43 for mounting the mold 1 for performing the CVD process, which is partitioned into a plurality of rooms.

As shown in the figure, a gas supply port 441 for supplying a reaction gas into the reactor 42 is provided at the bottom 422 of the reactor 42. The gas supply port 441 is connected to a gas supply device 46 provided outside via a gas supply pipe 442. The CVD apparatus 4 is configured so that the reaction gas can be supplied from the gas supply apparatus 46 into the reactor 42. In this example, TiCl ₄ , H ₂ , Ar, CH ₄ , and N ₂ are used as the reaction gas supplied from the gas supply device 46.

  As shown in the figure, an exhaust port 451 for exhausting the gas in the reactor 42 to the outside is provided at the bottom 422 of the reactor 42. The exhaust port 451 is connected to an exhaust pipe 452 provided from the vicinity of the ceiling 423 of the reactor 42 to the bottom 422. The CVD apparatus 4 is configured such that the gas in the reactor 42 can be sucked from the intake port 453 of the exhaust pipe 452 and exhausted to the outside from the exhaust port 451.

Next, the PVD apparatus 5 used for PVD processing will be described.
The PVD apparatus 5 has a cylindrical reactor 51 as shown in FIG. The reactor 51 has a diameter of 600 mm and a height of 600 mm. A plurality of metal targets 52 are provided on the inner surface 511 of the reactor 51. In addition, a pair of anode plates 53 are provided at positions adjacent to the surface 521 of the metal target 52. The anode plate 53 is connected to the plus (+) side of the arc power source, and the metal target 52 is connected to the minus (−) side of the arc power source. In this example, Cr or Ti is used as a material constituting the metal target 52.

  Further, as shown in the figure, the bottom 512 of the reactor 51 is provided with a turntable 54 that can rotate in the horizontal direction. The turntable 54 is connected to a bias power source. Further, a gas supply port 551 for supplying a reaction gas into the reactor 51 and an exhaust port 552 for exhausting the gas in the reactor 51 are provided in the ceiling portion 513 of the reactor 51. The reactor 51 is provided with a vacuum pump (not shown).

Next, the reproduction method of this example will be specifically described.
First, after masking the mold 1, a CVD process is performed.
As shown in FIG. 4, a masking plate 31 made of graphite is placed on the hole forming surface 120 so as to close the supply hole 12. Then, the mold 1 and the masking plate 31 are fastened and fixed by the CVD jig 322. Thereby, the hole forming surface 120 side of the mold 1 is masked.

Then, as shown in FIG. 5, the CVD jig 322 to which the mold 1 is fixed is set on the mounting table 43. At this time, the groove forming surface 130 of the mold 1 and the ceiling portion 423 of the reactor 42 are set to face each other so that the reaction gas can easily come into contact with the groove forming surface 130 of the mold 1. Then, the inside of the reactor 42 is heated to 900 to 1000 ° C., and TiCl ₄ , H ₂ , Ar, CH ₄ , and N ₂ as reaction gases are supplied from the gas supply device 46 into the reactor 42.

  As shown in the figure, the mold main body 11 heated to a high temperature comes into contact with the reaction gas circulating in the reactor 42, and a chemical reaction occurs on the groove forming surface 130 of the mold main body 11. Then, a synthesized film forming material (in this example, TiC, TiCN, TiN) is formed on the groove forming surface 130.

Finally, the reactor 42 is cooled, and the CVD jig 322 is taken out from the reactor 42. And the fastening of the fixing jig 322 is cancelled | released and the metal mold | die 1 is taken out.
As a result, as shown in FIG. 8, the CVD reproduction film 21 is formed on the groove forming surface 130 and the worn portion 19 of the corner portion 14. The CVD reproduction film 21 of this example is composed of three layers (not shown): a TiC layer, a TiCN layer, and a TiN layer.

Next, after masking the mold 1 subjected to the CVD process, a PVD process is performed.
As shown in FIG. 6, a masking plate 31 made of graphite is placed on the hole forming surface 120 so as to close the supply hole 12. Then, the mold 1 and the masking plate 31 are fastened and fixed by the PVD jig 321. Thereby, the hole forming surface 120 side of the mold 1 is masked.

Then, as shown in FIG. 7, the PVD jig 321 to which the mold 1 is fixed is set on the turntable 54. At this time, it is set so that the groove forming surface 130 of the mold 1 and the metal target 52 face each other. And after making the inside of the reactor 51 a vacuum state, it heats. The degree of vacuum in the reactor 51 is 1 × 10 ⁻⁶ Torr, and the heating temperature is 500 ° C. Then, N ₂ as a reaction gas is supplied into the reactor 51 from the gas supply port 551.

Then, as shown in the figure, arc discharge is generated on the surface 521 of the metal target 52 using the metal target 52 as a cathode. Due to the energy of the arc current (70 to 200 A) generated at this time, the material constituting the metal target 52 is instantly evaporated and becomes metal ions 529 and jumps into the reactor 51. On the other hand, when the bias voltage is applied to the fixing jig 321 from the bias power source via the turntable 54, the ejected metal ions 529 are accelerated. Then, together with the reaction gas (N ₂ ) particles, it becomes a film forming material (CrN, TiN in this example) and collides with the groove forming surface 130 of the mold 1 to form a deposited film. In this example, since the PVD process is performed while rotating the turntable 54, a uniform film can be formed.

Finally, the reactor 51 is cooled and then returned to the atmospheric state, and the PVD jig 321 is taken out from the reactor 51. Then, the fastening of the PVD jig 321 is released, and the regenerated mold 1 (the regenerated mold 10 for forming the honeycomb structure) is obtained.
As a result, as shown in FIG. 8, the PVD reproducing film 22 is formed on the CVD reproducing film 21 formed on the groove forming surface 130 and the worn portion 19 of the corner portion 14. In addition, in this example, after performing the PVD process using Cr for the metal target 52, the metal target 52 was changed to Ti and the PVD process was performed again. Therefore, the PVD reproducing film 22 is composed of two layers, a CrN layer and a TiN layer (not shown).

Next, the reproduction mold 10 obtained by the reproduction method of this example will be described.
As shown in FIG. 8, the honeycomb structure forming mold 10 of this example includes a groove forming surface 130 that is a front end surface in the extrusion direction of the mold body 11 in which the slit grooves 13 are formed, a groove forming surface 130, and slit grooves. A CVD reproduction film 21 formed by performing a CVD process is provided on the wear portion 19 of the corner portion 14 formed by intersecting the inner side surface 131 of 13.
And the PVD reproduction film 22 formed by performing the PVD process is provided on the CVD reproduction film 21 provided on the groove forming surface 130 and the worn portion 19 of the corner portion 14.

Further, as shown in the figure, the groove width w3 of the slit groove 13 in the reproduction mold 10 is 140 μm.
Further, as described above, the CVD reproduction film 21 includes three layers, that is, a TiC layer, a TiCN layer, and a TiN layer. The hardness of the CVD reproduction film 21 is 2000 HV. Since the hardness of the SKD material constituting the mold main body 11 is 500 HV, the hardness of the CVD reproduction film 21 is four times that of the mold main body 11.
The PVD reproducing film 22 is composed of two layers, a CrN layer and a TiN layer, as described above. The hardness of the CVD reproduction film 21 is 2000 HV, which is four times that of the mold body 11.

Further, FIG. 9 shows the relationship between the depth d from the groove forming surface 130 and the total film thickness t of both the reproducing films 21 and 22. Further, in the figure, the film thickness of only the CVD reproduction film 21 is also shown. As shown in FIG. 8, the depth d is the distance from the groove forming surface 130 to the depth direction of the slit groove 13, and the film thickness t is the thickness of both the reproduction films 21 and 22 in the direction parallel to the groove forming surface 130. The total film thickness.
As can be seen from FIG. 9, the film thickness of the PVD reproducing film 22 is almost zero at a position where the depth d is 0.5 mm. Therefore, the formation region d1 (see FIG. 8), which is the region where the PVD reproduction film 22 is formed, is 0.5 mm. That is, the PVD reproduction film 22 is formed in a region of 1/10 or less of the depth D (= 5 mm) of the slit groove 13. The formation region d1 of the PVD reproduction film 22 is a distance from the groove forming surface 130 to a position where the film thickness t of the PVD reproduction film 22 is zero.

FIG. 10 shows the relationship between the distance L from the inner surface 131 of the slit groove 13 and the total film thickness s of both reproducing films 21 and 22. Further, in the figure, the film thickness of only the CVD reproduction film 21 is also shown. As shown in FIG. 9, the distance L is the distance in the direction away from the inner surface 131 of the slit groove 13, and the film thickness s is the sum of both the reproduction films 21 and 22 in the direction opposite to the depth direction of the slit groove 13. The film thickness.
As can be seen from FIG. 10, the total film thickness s of both the reproduction films 21 and 22 is in the range of 6 to 8 μm. Moreover, the film thickness of the CVD reproduction | regeneration film | membrane 21 is the range of 1-2 micrometers.

Next, the function and effect of the reproduction method of this example will be described.
In the regeneration method of the honeycomb structure molding die 1 of this example, the CVD regeneration film 21 is formed on the groove forming surface 130 and the worn portion 19 of the corner portion 14 by the CVD process. Thereafter, a PVD reproduction film 22 is formed on the CVD reproduction film 21 formed on the groove forming surface 130 and the worn portion 19 of the corner portion 14 by PVD treatment. That is, both the CVD process and the PVD process are performed on the groove forming surface 130 side, which is the surface from which the material is extruded, and is the most important part that affects the formability and dimensional accuracy of the honeycomb structure. Both of the regeneration films 21 and PVD regeneration film 22 are formed.

As a result, the worn portion 19 of the corner portion 14 can be easily repaired with high accuracy. Then, the mold 1 that has reached the end of its life can be regenerated into a regenerated mold 10 that can form a honeycomb structure similar to the case where the mold 1 in the initial state is used.
Moreover, both the reproduction | regeneration films | membranes 21 and 22 formed by both processes become dense and have high hardness. Then, by forming both the regenerated films 21 and 22 on the groove forming surface 130 that is a surface from which the material is extruded and the worn portion 19 of the corner portion 14 where wear easily occurs, the reclaimed mold 10 Can effectively obtain excellent durability and wear resistance.

In addition, the CVD reproduction film 21 formed by the CVD process has high adhesion to the base material (which corresponds to the mold body 11 in this example). And since such a CVD reproduction | regeneration film | membrane 21 is formed as a foundation | substrate, the reproduction | regeneration metal mold | die 10 becomes the thing which was further excellent in durability.
Moreover, the PVD reproduction film 22 formed by the PVD process has high film formation accuracy. Since such a PVD reproduction film 22 is formed on the upper layer of the reproduction film having a two-layer structure formed on the groove forming surface 130 side, the reproduction mold 10 becomes even more accurate. Therefore, the formability and dimensional accuracy of the honeycomb structure when the regenerated mold 10 is used are even higher.

  In addition, the PVD process can easily form a thick film. Therefore, compared to the conventional case where only a CVD process that is difficult to form a thick film is used, a regenerated film having a sufficient thickness can be easily formed and repaired on the worn portion of the mold 1. it can. Thereby, the reproduction | regeneration process of the metal mold | die 1 can be performed efficiently.

  In this example, the CVD reproduction film 21 is composed of a multilayer of TiC, TiCN, and TiN. Therefore, the CVD reproduction film 21 has high hardness and can improve the adhesion with the mold body 11. Thereby, the reproduction | regeneration metal mold | die 10 can fully acquire durability and abrasion resistance. The CVD reproduction film 21 may be a single layer of the above material.

  The PVD reproducing film 22 is composed of a multilayer of TiN and CrN. Therefore, the PVD reproduction film 22 has a high hardness. Thereby, the reproduction | regeneration metal mold | die 10 can fully acquire durability and abrasion resistance. Note that the PVD reproduction film 22 may be a single layer of the above material.

  Further, the PVD reproducing film 22 is formed in a region of 1/10 or less of the depth D of the slit groove 13 from the groove forming surface 130 in the depth direction of the slit groove 13. Thereby, in the reproduction | regeneration metal mold | die 10, the dispersion | variation in the groove width of the slit groove | channel 13 can be suppressed. Therefore, it is possible to improve the dimensional accuracy of the honeycomb structure formed using the regeneration mold 10.

  The hardness of the CVD reproduction film 21 and the PVD reproduction film 22 is 2000 HV, which is four times that of the mold body 11. Therefore, both the regeneration films 21 and 22 have high hardness. Thereby, the reproduction | regeneration metal mold | die 10 can fully acquire durability and abrasion resistance.

  Thus, according to the die regeneration method of this example, the honeycomb structure molding die can be accurately and easily regenerated, and has excellent durability and wear resistance. A recycling mold for molding can be obtained.

(Example 2)
In this example, the CVD method and the PVD process are performed without masking the mold 1 in the reproduction method of the first embodiment.
In the regeneration method of this example, as shown in FIG. 11, the mold 1 is fastened and fixed by a CVD jig 322. And CVD processing is performed using the CVD apparatus 4 of FIG. Thereby, as shown in FIG. 13, the CVD reproduction film 21 is formed on the entire surface of the mold body 11.

Next, as shown in FIG. 12, the mold 1 is fastened and fixed by a PVD jig 321. Then, PVD processing is performed using the PVD apparatus 5 of FIG. At this time, only one metal target 52 is provided in the PVD apparatus 5, the mold 1 is set so that the metal target 52 and the groove forming surface 130 of the mold 1 face each other, and the position of both is fixed and the PVD is fixed. Process. As a result, as shown in FIG. 13, the PVD reproduction film 22 is formed on the CVD reproduction film 21 formed on the groove forming surface 130 and the worn portion 19 of the corner portion 14.
Others are the same methods and configurations as in the first embodiment, and have the same functions and effects.

(Example 3)
In this example, the honeycomb structure was repeatedly formed using the regenerated mold 10 obtained in Example 1 or Example 2, and the life of the mold was evaluated.
As a product of the present invention, a recycle mold 10 (a product E1 of the present invention) of Example 1 or Example 2 regenerated by CVD processing and PVD processing was prepared. Moreover, as a comparative product, an unused initial mold (comparative product C1) that has not been subjected to any treatment, and a regenerated mold (comparative product) that has been regenerated by performing only the PVD process without performing the CVD process for forming the base. Article C2) was prepared. In any mold, the groove width of the slit groove 13 is 140 μm.

Next, an evaluation method will be described.
Using the regenerated mold 10 of the product E1 of the present invention, a material containing a ceramic raw material for cordierite is extruded to form a honeycomb structure. Note that the honeycomb structure to be formed has a cylindrical shape with a diameter of 100 mm and a length of 90 mm. This operation is repeated, and when the groove width of the slit groove 13 on the groove forming surface 130 becomes 150 μm or more, the life of the mold is reached. The same applies to the comparison products C1 and C2. Then, the production number of honeycomb structures until the end of the mold life is measured.

Next, the result of evaluation is shown in FIG. In the figure, the production number of the comparative product C1 is represented as a production ratio 1.
As can be seen from the figure, the product E1 of the present invention regenerated by the CVD process and the PVD process has a higher production ratio than the comparative products C1 and C2. That is, it can be seen that the product E1 of the present invention has very excellent durability and wear resistance and has a long mold life.

Sectional drawing which shows the structure of the metal mold | die in Example 1. FIG. FIG. 3 is a cross-sectional perspective view showing a structure of a mold in Example 1. Sectional drawing which shows the slit groove periphery of a metal mold | die in Example 1. FIG. Explanatory drawing which shows the state which fixed the metal mold | die with the jig | tool for CVD in Example 1. FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. Explanatory drawing which shows the state which fixed the metal mold | die with the jig | tool for PVD in Example 1. FIG. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram illustrating a configuration of a PVD apparatus according to a first embodiment. FIG. 3 is an explanatory view showing the periphery of the slit groove of the regenerated mold in Example 1. FIG. 3 is an explanatory diagram showing the relationship between the depth d from the groove forming surface and the film thickness t of the reproduction film in Example 1. FIG. 3 is an explanatory diagram showing the relationship between the distance L from the inner surface of the slit groove and the thickness s of the reproduction film in Example 1. Explanatory drawing which shows the state which fixed the metal mold | die with the jig | tool for CVD in Example 2. FIG. Explanatory drawing which shows the state which fixed the metal mold | die with the jig | tool for PVD in Example 2. FIG. Explanatory drawing which shows the slit groove periphery of the reproduced | regenerated metal mold | die in Example 2. FIG. Explanatory drawing which shows the production ratio of the metal mold | die in Example 3. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold for honeycomb structure shaping | molding 10 Regeneration mold for honeycomb structure shaping | molding 11 Mold body 12 Supply hole 120 Hole formation surface 13 Slit groove 130 Groove formation surface 131 Inner side surface (inner side surface of slit groove)
14 Corner portion 19 Wear portion 21 CVD reproduction film 22 PVD reproduction film

Claims (12)

Forming a honeycomb structure having a supply hole for supplying a material, a slit groove provided in a lattice shape in communication with the supply hole and for forming the material into a honeycomb shape, and having a portion worn by use In the method of reclaiming the mold,
At least a groove forming surface which is a front end surface in the extrusion direction of the mold main body in which the slit groove is formed, and a worn portion of a corner portion formed by intersecting the groove forming surface and the inner side surface of the slit groove. After forming a CVD reproduction film on the top by performing a CVD process,
A film forming material is supplied from the groove forming surface side on the CVD reproducing film formed on the groove forming surface and the worn part of the corner portion, and PVD treatment is performed to form a PVD reproducing film. A method for regenerating a mold for forming a honeycomb structure, comprising forming the honeycomb structure.   2. The method for regenerating a mold for forming a honeycomb structure according to claim 1, wherein the CVD regenerated film is composed of a single layer or multiple layers of TiC, TiCN, and TiN.   3. The method for regenerating a mold for forming a honeycomb structure according to claim 1 or 2, wherein the PVD regenerated film is composed of a single layer or multiple layers of TiN and CrN.   The PVD reproduction film according to any one of claims 1 to 3, wherein the PVD reproduction film is formed in a region of 1/10 or less of the depth of the slit groove from the groove forming surface in the depth direction of the slit groove. A method for regenerating a mold for forming a honeycomb structure, characterized in that:   The honeycomb structure molding die according to any one of claims 1 to 4, wherein the hardness of the CVD regeneration film and the PVD regeneration film is 1.5 times or more that of the mold body. Playback method.   The method for regenerating a mold for forming a honeycomb structure according to any one of claims 1 to 5, wherein the CVD regenerated film and the PVD regenerated film have a hardness of 750 HV or more. Forming a honeycomb structure having a supply hole for supplying a material, a slit groove provided in a lattice shape in communication with the supply hole and for forming the material into a honeycomb shape, and having a portion worn by use In a regenerative mold for forming a honeycomb structure formed by regenerating a mold for use,
At least a groove forming surface which is a front end surface in the extrusion direction of the mold main body in which the slit groove is formed, and a worn portion of a corner portion formed by intersecting the groove forming surface and the inner side surface of the slit groove. Above, a CVD reproduction film formed by performing a CVD process is provided,
A honeycomb structure forming, wherein a PVD regenerated film formed by performing a PVD process is provided on the CVD regenerated film provided on the groove forming surface and the worn part of the corner Reclaim mold.   8. A regeneration mold for forming a honeycomb structure according to claim 7, wherein the CVD regeneration film is composed of a single layer or multiple layers of TiC, TiCN, and TiN.   9. The regeneration mold for forming a honeycomb structure according to claim 7 or 8, wherein the PVD regeneration film is composed of a single layer or multiple layers of TiN and CrN.   The PVD reproduction film according to any one of claims 7 to 9, wherein the PVD reproduction film is formed in a region of 1/10 or less of the depth of the slit groove from the groove forming surface in the depth direction of the slit groove. A method for regenerating a mold for forming a honeycomb structure, characterized in that:   The honeycomb structure molding die according to any one of claims 7 to 10, wherein the hardness of the CVD regeneration film and the PVD regeneration film is 1.5 times or more that of the mold body. Playback method.   The method for regenerating a mold for forming a honeycomb structure according to any one of claims 7 to 11, wherein the CVD regenerated film and the PVD regenerated film have a hardness of 750 HV or more.

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