JP5136117B2 - Method for regenerating mold for forming honeycomb structure - Google Patents

Description

  The present invention relates to a method for regenerating a mold for forming a honeycomb structure for extrusion forming the honeycomb structure.

A ceramic honeycomb structure used as an exhaust gas purification filter for automobiles is produced by extruding a material containing a ceramic raw material using a honeycomb structure molding die (hereinafter, simply referred to as a die). Is done.
Some of the molds include a supply hole for supplying a material, and a slit groove provided in a lattice shape so as to communicate with the supply hole and for forming the material into a honeycomb shape.

In manufacturing the mold, in order to deburr the processed slit groove and to adjust the surface roughness and dimensions, fluid polishing is performed by flowing a fluid abrasive in the slit groove. At this time, the mold may be worn by contact with the fluid abrasive.
Further, when the mold is used, the mold is worn by contact with the material flowing through the slit groove. In particular, wear is likely to occur at the corners formed by the intersection of the groove forming surface that is the surface through which the material is extruded and the inner surface of the slit groove through which the material flows.
And the above-mentioned metal mold | die will reduce the dimensional accuracy of the honeycomb structure to shape | mold by the abrasion produced in this way, and it will become difficult to use, and it will become a lifetime.

Conventionally, a method has been proposed in which a mold having a short lifetime or a lifetime has been regenerated 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. However, in this case, the portion subjected to the plating treatment cannot be said to have sufficient wear resistance.
Therefore, Patent Document 1 discloses a method of forming a wear-resistant material on the entire surface of a mold by a CVD process in order to obtain sufficient wear resistance.

Japanese Patent Laid-Open No. 5-269719

  However, the wear portion of the mold includes a so-called uneven wear portion in which the inner surface of the slit groove is unevenly worn and the groove width near the opening of the slit groove is unevenly widened. Therefore, even if a wear-resistant material is formed by CVD processing as in Patent Document 1, the slit groove having the uneven wear portion is in a state where the groove width is unevenly widened. This phenomenon is particularly prominent in the vicinity of the opening of the slit groove. As a result, even if the material is extruded using the regenerated mold, the extruded material is distorted and the dimensional accuracy of the honeycomb structure cannot be sufficiently ensured.

  The present invention has been made in view of such conventional problems, and a mold having a short life or a long life is excellent in durability and wear resistance, and has high moldability and dimensional accuracy. It is an object of the present invention to provide a method for regenerating a mold for forming a honeycomb structure that can be regenerated as:

The present invention includes a mold body having a supply hole for supplying a material and a slit groove provided in a lattice shape so as to communicate with the supply hole and for forming the material into a honeycomb shape. A method for regenerating a mold for forming a honeycomb structure, comprising:
At least on the groove forming surface in which the slit groove is formed in the mold body, and the worn portion of the corner formed by the intersection of the groove forming surface and the inner side surface of the slit groove, A film forming step of forming a regenerated cured film of 1 to 10 μm;
And a grinding step of grinding 50% or more of the regenerated cured film formed on the groove forming surface in the thickness direction.

  In the present invention, in the film forming step, a regenerated cured film having a film thickness of 1 to 10 μm is formed on at least the groove forming surface and a worn portion of the corner (hereinafter referred to as a worn portion). Therefore, the regenerated cured film is formed in the vicinity of the opening of the slit groove, which is a portion where the material is extruded, and which affects the moldability and dimensional accuracy. As a result, the worn portion can be easily and accurately restored, and can be regenerated as a mold having excellent durability and wear resistance.

  Furthermore, in the present invention, after the film formation step, the grinding step of grinding the regenerated cured film formed on the groove forming surface by 50% or more in the thickness direction is performed. Thereby, the dispersion | variation in the groove width dimension of the said slit groove | channel can be made small, and it can reproduce | regenerate as a metal mold | die with high moldability and dimensional accuracy.

  That is, the wear portion includes a so-called uneven wear portion in which the inner surface of the slit groove is worn unevenly, and the groove width near the opening of the slit groove is unevenly widened. Therefore, for example, even if the regenerated cured film is uniformly formed, the slit groove having the uneven wear portion is in a state where the groove width is unevenly widened. This phenomenon is particularly prominent in the vicinity of the opening of the slit groove.

  Therefore, in the present invention, the regenerated cured film formed on the groove forming surface is ground by 50% or more in the thickness direction, and the regenerated cured film near the opening of the slit groove having a large variation in groove width is cut. Thus, the deviation of the groove width of the slit groove is made as small as possible. As a result, variations in the groove width dimension of the slit groove can be reduced, and the mold can be reproduced as a mold having high formability and dimensional accuracy.

  As described above, according to the method for regenerating a honeycomb structure molding die of the present invention, a die having a short lifetime or a long lifetime is superior in durability and wear resistance, and is excellent in moldability and dimensional accuracy. Can be recycled as a high mold.

  In the present invention, the worn part in the mold is, for example, fluid polishing performed for deburring and adjusting the surface roughness, dimensions, etc. of the supply hole and the slit groove after processing in the manufacturing process, It is the part that is worn by repeated extrusion of the material during use.

In the film forming step, the regenerated cured film having a thickness of 1 to 10 μm is formed.
When the thickness of the regenerated cured film is less than 1 μm, the worn portion may not be sufficiently repaired. On the other hand, when the thickness exceeds 10 μm, it is difficult to form the regenerated cured film with high accuracy, and the variation in thickness may increase. Moreover, there exists a possibility that the adhesiveness with respect to the base material (mold main body) of the said reproduction | regeneration hardening film may fall.

In the grinding step, the regenerated cured film formed on the groove forming surface is ground by 50% or more in the thickness direction.
When the grinding amount of the regenerated cured film is less than 50% of the thickness, the deviation of the groove width of the slit groove may not be sufficiently reduced.
In the grinding step, if necessary to minimize the deviation of the groove width of the slit groove, the regenerated cured film formed on the groove forming surface is entirely (100% of the thickness) as described later. ) It is also possible to grind and further grind a part of the mold body.

In the film forming step, it is preferable to form the regenerated cured film using at least one of PVD and CVD .
In this case, the regenerated cured film can be formed with high accuracy, and can be regenerated as a mold having excellent durability and wear resistance.
In addition, as a formation method of the said reproduction | regeneration hardening film | membrane, the composite process which combined several processes, such as performing the process of both PVD process and CVD process, can also be used. Also, a processing method other than the above can be used.

Of the above processing methods, the PVD processing has very high film forming accuracy. Therefore, the regenerated cured film can be formed with higher accuracy. Moreover, since the PVD process can form a thick film, the regenerated cured film can be efficiently formed.
Further, the CVD treatment can improve the adhesion of the regenerated cured film to the base material (mold body). Therefore, the durability of the regenerated cured film can be further improved .

In the grinding step, the regenerated cured film formed on the groove forming surface is ground including a part of the mold body in the thickness direction,
The groove depth of the slit groove after the grinding step is preferably 90% or more of the groove depth of the slit groove before the film forming step.
That is, in this case, all of the regenerated cured film formed on the groove forming surface is ground, and a part of the mold body is further ground. Therefore, the deviation of the groove width of the slit groove can be further reduced, and the variation in the groove width dimension of the slit groove can be further reduced.

  In addition, when the groove depth of the slit groove after the grinding step is less than 90% before the film forming step, the groove depth of the slit groove is shortened, and the distribution distance of the material in the slit groove is sufficient. There is a risk that it cannot be secured. For this reason, the bonding between the materials becomes weak, and the formability, dimensional accuracy, strength, and the like of the honeycomb structure to be formed may be reduced.

Moreover, it is preferable that the grinding amount of the said mold main body in the said grinding process is 0.5 mm or less.
When the grinding amount of the mold main body exceeds 0.5 mm, the groove depth of the slit groove is shortened, and there is a possibility that the distribution distance of the material in the slit groove cannot be secured sufficiently. For this reason, the bonding between the materials becomes weak, and the formability, dimensional accuracy, strength, and the like of the honeycomb structure to be formed may be reduced.

Moreover, after the said grinding process, it is preferable to perform the adjustment process which carries out the fluid grinding | polishing with respect to the said slit groove of the specific area | region where the extrusion speed | rate of material is slow.
That is, if there is variation in the surface roughness of the inner surface of the slit groove, the balance of the flow rate of the material is lost, and a portion where the extrusion speed of the material extruded from the slit groove is high and a portion where the material is slow are generated. Therefore, the honeycomb structure is formed in a bent state with a deviation from the extrusion direction of the material. Therefore, by subjecting the slit groove in a specific region where the material extrusion speed is slow to fluid polishing, the inner surface of the slit groove in the specific region can be polished and smoothed, and the flow rate of the material can be increased. Thereby, the dispersion | variation in the extrusion speed of material can be made small, and the moldability and dimensional accuracy of the honeycomb structure to shape | mold can be improved.

The specific region can be determined by actually extruding the material through the mold and extruding the material, the extrusion rate of the material, the formability / bending of the honeycomb structure to be formed, and the like.
The fluid polishing is performed, for example, by flowing a slurry-like fluid abrasive through the supply hole and the slit groove. At this time, masking is performed so that the fluid abrasive does not flow to portions other than the specific region. Thereby, the inner surface of the slit groove in the specific area where the material extrusion speed is slow can be polished.
Moreover, as a fluid abrasive | polishing material used for fluid grinding | polishing, what contains silicon carbide, a diamond, etc. can be used, for example.

Example 1
A method for regenerating a mold for forming a honeycomb structure according to an embodiment of the present invention (hereinafter simply referred to simply as a mold) will be described with reference to FIGS.
As shown in FIGS. 1 to 3, the mold 1 to be regenerated in this example is for forming a honeycomb structure by extruding a material containing a ceramic raw material or the like. The mold 1 includes a mold body 11 having a supply hole 12 for supplying a material, and a slit groove 13 provided in a lattice shape so as to communicate with the supply hole 12 and for forming the material into a honeycomb shape. , Having a worn portion (wear portion 19).

Then, as shown in FIGS. 4 to 7, the method for regenerating the mold 1 of this example includes at least the groove forming surface 130 in which the slit groove 13 is formed in the mold body 11, the groove forming surface 130, and the slit groove 13. Forming a regenerated cured film 2 having a thickness of 1 to 10 μm on the worn portion (weared portion 19) of the corner portion 14 formed by intersecting with the inner side surface 131, and a groove forming surface 130. And a grinding step of grinding 50% or more of the regenerated cured film 2 formed in the thickness direction.
This will be described in detail below.

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 surface for extruding material from the mold body 11.
In this example, the mold body 11 is made of an SKD (alloy tool steel) material. FIG. 2 is a perspective sectional view showing a part of a general mold 1.

  Further, as shown in FIG. 3, the mold 1 is subjected to fluid polishing performed for deburring of the supply holes 12 and slit grooves 13 after processing and adjustment of surface roughness and dimensions in the manufacturing process, and in use. It has a portion (wear portion 19) that has been worn by repeated extrusion of the material. The mold 1 has a lifetime almost because it becomes difficult to form a honeycomb structure having a desired size due to the worn portion.

  In particular, as shown in the figure, in the mold body 11, the fluid abrasive used for fluid polishing and the material constituting the honeycomb structure are extruded, and the groove forming surface 130 and the inner surface 131 of the slit groove 13 The corner portion 14 formed by intersecting has a wear portion 19. Further, the wear portion 19 includes a partial wear portion 191 in which the inner side surface 131 on one side of the slit groove 13 is worn by being biased.

  In the figure, the slit groove 13 having the uneven wear portion 191 is shown. Moreover, in the same figure, the position of the initial corner | angular part 14 is shown with the dotted line. That is, the region between the dotted line and the solid line in the figure corresponds to the worn portion of the corner portion 14. Although illustration is omitted, actually, there is a worn part on the inner surface 131 of the slit groove 13 other than the corner part 14, for example.

Next, a method for regenerating the mold 1 of this example will be specifically described.
In the film forming process, at least the groove forming surface 130 in which the slit groove 13 is formed in the mold body 11 and the wear of the corner portion 14 formed by the intersection of the groove forming surface 130 and the inner surface 131 of the slit groove 13. The regenerated cured film 2 having a film thickness of 1 to 10 μm was formed on the part (the worn part 19). In this example, the regenerated cured film 2 was formed by supplying a film forming material mainly from the groove forming surface 130 side of the mold 1 and performing PVD treatment.

Here, the PVD apparatus 5 used for the PVD process 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 and Ti are used as materials 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).

  When the PVD process is performed to form the regenerated cured film 2, as shown in FIG. 4, the hole forming surface 120 is covered with a masking plate 311 made of graphite so as to close the supply hole 12. The masking plate 311 was fastened and fixed by a fixing jig 321. Thereby, the hole forming surface 120 side of the mold 1 was masked.

Next, as shown in FIG. 5, the mold 1 fixed by the fixing jig 321 was set on the turntable 54. At this time, it was set so that the groove forming surface 130 of the mold 1 and the metal target 52 face each other. Then, the reactor 51 was heated in a vacuum state. The degree of vacuum in the reactor 51 was 1 × 10 ⁻⁶ Torr, and the heating temperature was 500 ° C. Thereafter, N ₂ as a reaction gas was supplied into the reactor 51 from the gas supply port 551.

Next, as shown in the figure, arc discharge was generated on the surface 521 of the metal target 52 using the metal target 52 as a cathode. At this time, due to the energy of the generated arc current (70 to 200 A), the materials (Cr, Ti) constituting the metal target 52 are instantly evaporated and become metal ions 529 and jump out 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. Thereby, metal ions 529 were made to collide with the surface of the mold 1 as a film forming material (CrN, TiN) together with the reaction gas (N ₂ ) particles, and deposited.

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. As the metal target 52, metals other than Cr and Ti can also be used. Moreover, in order to perform the PVD process efficiently, the PVD process was performed while rotating the turntable 54.
Finally, after the reactor 51 was cooled and returned to the atmospheric state, the mold 1 was taken out from the reactor 51 and the fastening of the fixing jig 321 was released.

  In this way, as shown in FIG. 6, the regenerated cured film 2 was formed on the groove forming surface 130 of the mold body 11 and the worn portion 19 of the corner portion 14. The regenerated cured film 2 is composed of two layers, a CrN layer and a TiN layer (not shown). The film thickness t of the regenerated cured film 2 formed on the groove forming surface 130 is about 10 μm.

  Next, in the grinding step, as shown in FIG. 7, the regenerated cured film 2 formed on the groove forming surface 130 was ground by 50% or more in the thickness direction. In this example, the regenerated cured film 2 was ground using a surface grinder (diamond grindstone), and the regenerated cured film 2 formed with a film thickness t = about 10 μm was ground until the film thickness s = 5 μm. That is, the regenerated cured film 2 was ground 50% in the thickness direction.

Furthermore, in this example, after the grinding process, an adjustment process for fluid polishing was performed on the slit groove 130 in a specific region where the material extrusion speed was slow.
In the adjustment process, first, a specific region where the material extrusion speed in the mold 1 is slow was selected. Specifically, as shown in FIG. 8, the mold 1 was fixed to the mold holder 33, and the cylinder 34 was attached to the hole forming surface 120 side. Then, by moving the piston 35 in the direction of the mold 1, the material 80 in the cylinder 34 was introduced into the supply hole 12 of the mold 1 and extruded from the slit groove 13 to form the honeycomb structure 8.

At this time, as shown in the figure, if the surface roughness of the inner surface 131 of the slit groove 13 varies, the balance of the flow rate of the material 80 is lost, and the extrusion speed of the material 80 extruded from the slit groove 13 is high. And a slow part occur. Therefore, the honeycomb structure 8 is formed in a bent state with a deviation from the extrusion direction of the material 80.
In this example, as shown in the figure, the formed honeycomb structure 8 was observed, and a region where the extrusion rate of the material 80 was slow was selected as the specific region 110.

  Next, as shown in FIG. 9, a masking plate 36 made of graphite is placed on the hole forming surface 120 so as to close the supply holes 12 other than the specific region 110 of the mold 1 to form holes in the specific region 110 of the mold 1. The surface 120 side was masked. Then, by moving the piston 35 in the direction of the mold 1, the fluid abrasive 89 in the cylinder 34 was circulated through the supply hole 12 and the slit groove 13 in the specific region 110 of the mold 1.

  In this example, as the fluid abrasive 89, a slurry in which a polymer synthetic resin, a polymer synthetic grease and an artificial abrasive are mixed is used. As the artificial abrasive, silicon carbide, diamond, or the like can be used. The hardness of the fluid abrasive 89 was about 300 Pa · s.

  Note that when performing fluid polishing, the viscosity of the fluid abrasive 89 changes due to the influence of temperature, so it is preferable to ensure a working environment at a constant temperature. In addition, when there is moisture or the like in the object (mold 1), the polishing may not be performed sufficiently. Therefore, it is preferable to perform the polishing with the moisture on the surface of the mold 1 removed as much as possible.

In this way, by circulating the fluid abrasive 89, the surface roughness and dimensions of the supply hole 12 and the slit groove 13 in the specific region 110 of the mold 1 are adjusted, and the extrusion speed of the material 80 in the mold 1 is adjusted. It was made uniform.
In this way, the mold 1 that had reached the end of its life was regenerated.

Next, the effect of the method for regenerating the mold 1 of this example will be described.
In this example, in the film forming process, the regenerated cured film 2 having a film thickness of 1 to 10 μm is formed on at least the groove forming surface 130 and the worn portion (the worn portion 19) of the corner portion 14 in the mold body 11. To do. Therefore, the regenerated cured film 2 is formed in the vicinity of the opening of the slit groove 13 that is the portion where the material is extruded and affects the moldability and dimensional accuracy. As a result, the worn portion 19 can be easily and accurately restored, and can be regenerated as the mold 1 having excellent durability and wear resistance.

  Further, in this example, after the film forming process, a grinding process is performed in which the regenerated cured film 2 formed on the groove forming surface 130 is ground by 50% or more in the thickness direction. Thereby, the dispersion | variation in the groove width dimension of the slit groove | channel 13 can be made small, and it can reproduce | regenerate as the metal mold | die 1 with high moldability and dimensional accuracy.

  That is, the wear portion 19 includes a so-called uneven wear portion 191 in which the inner surface 131 of the slit groove 13 is worn unevenly and the groove width in the vicinity of the opening of the slit groove 13 is unevenly widened. Therefore, for example, even if the regenerated cured film 2 is formed uniformly, the slit groove 13 having the uneven wear portion 191 is in a state where the groove width is unevenly widened. This phenomenon is particularly prominent in the vicinity of the opening of the slit groove 13.

  Therefore, in this example, the regenerated cured film 2 formed on the groove forming surface 130 is ground by 50% or more in the thickness direction, and the regenerated cured film 2 near the opening of the slit groove 13 having a large variation in groove width is cut. Thus, the deviation of the groove width of the slit groove 13 is made as small as possible. As a result, the variation in the groove width dimension of the slit groove 13 can be reduced, and the mold 1 having high formability and dimensional accuracy can be reproduced.

  In this example, in the film forming step, the regenerated cured film 2 is formed by PVD processing. Therefore, the reproduction | regeneration hardening film 2 can be formed with sufficient precision and it can reproduce | regenerate as a metal mold | die excellent in durability and abrasion resistance. Moreover, since the PVD process has very high film forming accuracy, the regenerated cured film 2 can be formed with higher accuracy. Moreover, since the PVD process can form a thick film, the regenerated cured film 2 can be efficiently formed.

  In addition, after the grinding process, an adjustment process for fluid polishing is performed on the slit groove 13 in the specific region 110 where the material extrusion speed is slow. Thereby, the inner surface 131 of the slit groove 13 in the specific region 110 can be polished and smoothed, and the flow rate of the material in the specific region 110 can be increased. And the dispersion | variation in the flow velocity of material can be made small, and the moldability and dimensional accuracy of the honeycomb structure to shape | mold can be improved.

  As described above, according to the method for regenerating the honeycomb structure molding die 1 of this example, the die 1 that has reached the end of its life is a mold that has excellent durability and wear resistance, and has high moldability and dimensional accuracy. 1 can be reproduced.

  In this example, in the grinding process, as shown in FIG. 7, the regenerated cured film 2 formed on the groove forming surface 130 is ground by 50% in the thickness direction. However, as shown in FIG. It is also possible to grind the regenerated cured film 2 including a part of the mold body 11 in the thickness direction. That is, it is possible to grind all of the regenerated cured film 2 formed on the groove forming surface 130 and further grind a part of the mold body 11. In this case, the deviation of the groove width of the slit groove 13 can be further reduced, and the variation in the groove width dimension of the slit groove 13 can be further reduced.

  At this time, as shown in the figure, the groove depth D2 of the slit groove 13 after the grinding process is preferably 90% or more of the groove depth D1 of the slit groove 13 before the film forming process. The grinding amount K of the mold body 11 is preferably 0.5 mm or less. In this case, the distribution distance of the material in the slit groove 13 can be sufficiently secured. Therefore, the formability and strength of the honeycomb structure to be formed can be sufficiently ensured.

(Example 2)
This example is an example in which the method for forming the regenerated cured film 2 in the film forming process is changed with respect to the method for regenerating the honeycomb structure forming mold 1 of the first embodiment.
In this example, the regenerated cured film 2 was formed by supplying a film forming material mainly from the groove forming surface 130 side of the mold 1 and performing a CVD process.

Here, the CVD apparatus 4 used for the CVD process will be described.
As shown in FIG. 12, 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.

  Then, when the regenerated cured film 2 is formed by performing the CVD process, as shown in FIG. 11, a masking plate 312 made of graphite is placed on the hole forming surface 120 so as to close the supply hole 12, and the mold 1 and The masking plate 312 was fastened and fixed by a fixing jig 322. Thereby, the hole forming surface 120 side of the mold 1 was masked.

Next, as shown in FIG. 12, the mold 1 fixed by the fixing jig 322 was 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 were set to face each other so that the reaction gas could easily come into contact with the groove forming surface 130 of the mold 1. And the inside of the reactor 42 was heated at 900-1000 degreeC. Thereafter, TiCl ₄ , H ₂ , Ar, CH ₄ , and N ₂ as reaction gases were supplied from the gas supply device 46 into the reactor 42.

As a result, as shown in the figure, the mold 1 heated to a high temperature comes into contact with the reaction gas circulating in the reactor 42, and a chemical reaction occurs on the surface of the mold 1. Then, a synthesized film forming material (in this example, TiC, TiCN, TiN) was formed on the surface of the mold 1.
Finally, after the reactor 42 was cooled, the mold 1 was taken out of the reactor 42 and the fastening of the fixing jig 322 was released.

As described above, as shown in FIG. 13, the regenerated cured film 2 is formed on the groove forming surface 130 of the mold body 11, the inner surface 131 of the slit groove 13 including the worn portion 19 of the corner portion 14, the inner surface 121 of the supply hole 12, and the like. Formed. The regenerated cured film 2 is composed of three layers, a TiC layer, a TiCN layer, and a TiN layer (not shown).
Other steps are the same as those in the first embodiment.

Also in the case of this example, like the first embodiment, the mold 1 that has reached the end of its life can be regenerated as a mold 1 having excellent durability and wear resistance and high moldability and dimensional accuracy.
In the film forming step, the regenerated cured film 2 is formed by CVD processing. Therefore, the regenerated cured film 2 can be formed with high accuracy, and can be regenerated as the mold 1 having excellent durability and wear resistance. Further, the CVD treatment can improve the adhesion of the regenerated cured film 2 to the base material (mold body 11). Therefore, the durability of the regenerated cured film 2 can be further improved.
The other functions and effects are the same as those of the first embodiment.

In this example, in the film forming step has formed the playback cured film 2 by a CVD process, or the like for processing of both the PVD process and CVD process in Example 2 of Example 1, combining a plurality of processing The regenerated cured film 2 can also be formed by performing the combined treatment.

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 in the fixing jig 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. Sectional drawing which shows the slit groove periphery of the metal mold | die after the film-forming process in Example 1. FIG. Sectional drawing which shows the slit groove periphery of the metal mold | die after the grinding process in Example 1. FIG. Explanatory drawing which shows the process of selecting the specific area | region of the metal mold | die in Example 1. FIG. FIG. 3 is an explanatory diagram illustrating a process of performing fluid polishing on a specific region of a mold in the first embodiment. Sectional drawing which shows the slit groove periphery of the metal mold | die after the grinding process in Example 1. FIG. Explanatory drawing which shows the state which fixed the metal mold | die in the fixing jig in Example 2. FIG. FIG. 6 is an explanatory diagram showing a configuration of a CVD apparatus in Example 2. Sectional drawing which shows the slit groove periphery of the metal mold | die after the film-forming process in Example 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold for forming honeycomb structure 11 Mold body 12 Supply hole 13 Slit groove 130 Groove forming surface 131 Inner side surface 14 Corner portion 19 Abrasion portion 2 Regenerated cured film

Claims (5)

A honeycomb structure including a die body having a supply hole for supplying a material, and a slit body provided in a lattice shape in communication with the supply hole and for forming the material into a honeycomb shape, and having a worn portion A method for regenerating a body molding die,
At least on the groove forming surface in which the slit groove is formed in the mold body, and the worn portion of the corner formed by the intersection of the groove forming surface and the inner side surface of the slit groove, A film forming step of forming a regenerated cured film of 1 to 10 μm;
And a grinding step of grinding the regenerated cured film formed on the groove forming surface by 50% or more in the thickness direction. 2. The method for regenerating a mold for forming a honeycomb structure according to claim 1, wherein, in the film forming step, the regenerated cured film is formed using at least one of PVD and CVD . In claim 1 or 2, in the grinding step, the regenerated cured film formed on the groove forming surface is ground including a part of the mold body in the thickness direction,
The method for reclaiming a honeycomb structure molding die, wherein a groove depth of the slit groove after the grinding step is 90% or more of a groove depth of the slit groove before the film forming step.   The method for regenerating a mold for forming a honeycomb structure according to claim 3, wherein a grinding amount of the mold body in the grinding step is 0.5 mm or less.   5. The honeycomb structure forming gold according to claim 1, wherein after the grinding step, an adjustment step of performing fluid polishing on the slit groove in a specific region where the material extrusion speed is slow is performed. How to play the mold.

Images