JP2008188701A - Drill for manufacturing honeycomb object molding die, and method for manufacturing honeycomb object molding die using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drill for manufacturing a honeycomb object molding die with a long cutting tool service life, and a method for manufacturing the honeycomb object molding die using the drill manufacturing the honeycomb body molding die with a uniform extrusion capacity of material. <P>SOLUTION: In manufacturing the honeycomb body molding die, the drill is used in carrying out a drilling process of forming a supply hole with a 0.7-1.3 mm diameter and a 13.5-14.5 mm depth on a hole forming face of a die material. It is composed by axially connecting: a cutting part 5 having two tip cutting edges 51 made of cemented carbide, two side face cutting edges 52 spirally formed from its outer circumference end, and a spiral groove part 53 for chip discharge formed along the side face cutting edges 52; and a shank part 6 held by a chuck of a rotating means. A web thickness in the cutting part 5 is 0.20-0.32 mm, a length of the cutting part 5 is 20.0 mm or less, and a value adding twice the length of its diameter to the depth of the supply hole or more, and an angle between the two tip cutting edges 51 is 110-120°. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drill used for manufacturing a honeycomb body molding die and a method for manufacturing a honeycomb body molding die using the drill.

  For example, a ceramic honeycomb body mainly composed of cordierite used as an exhaust gas purification filter for automobiles, etc. includes a ceramic raw material using a honeycomb body molding die (hereinafter simply referred to as a mold). Manufactured by extruding the material. This honeycomb body is formed of a large number of cells by providing partition walls in a lattice shape, and the cell shape includes various shapes such as a quadrangle and a hexagon.

As the above-mentioned mold, a large number of supply holes for supplying a material and a slit groove for forming the material into a honeycomb shape are formed in a lattice shape in communication with the supply holes. (Patent Documents 1 and 2).
The supply hole is formed using a drill. Conventionally, drills made of high-speed steel, which is frequently used as an excellent high-speed tool steel, have been used. However, even in the case of high-speed steel, when a large number of extremely fine supply holes in the mold are formed as a drill, the machined surface becomes rough due to wear, or the dimensions of the supply holes become non-uniform. There is a problem of adversely affecting the flow of the drill and a problem that the tool life of the drill is short and the cost is increased.

In addition, when machining the supply hole, slight deflection of the drill leads to bending of the hole or drill breakage.
If there is variation in the hole accuracy of the above-mentioned supply holes, if the surface roughness and hole diameter are different, or if there is a bend in the hole, it will affect the flowability of the raw material, and the resulting honeycomb body will be buckled, There was a problem that cutting was caused.
In addition, in order to increase the productivity of the mold, reduction of drill replacement time is desired, and development of a drill having a long life has been desired.

  On the other hand, it has been attempted to use a carbide drill having higher hardness and higher wear resistance than high-speed steel. However, although cemented carbide has better wear resistance than high-speed steel, it is brittle, so it breaks early, and there is a problem that the life of the drill is shortened.

Japanese Patent No. 3750348 Japanese Patent No. 3814849

  The present invention has been made in view of such conventional problems, and is a honeycomb body molding die having a long blade tool life that can produce a honeycomb body molding die having a uniform material extrusion amount. It is an object of the present invention to provide a mold manufacturing drill and a method for manufacturing a die for forming a honeycomb body using the drill.

1st invention manufactures the metal mold | die for honeycomb body formation which has the supply hole for supplying material, and the polygonal lattice-shaped slit groove | channel for communicating with this supply hole and shape | molding material into a honeycomb shape. At the time of drilling, a drill used when performing the hole machining step of forming the supply hole having a diameter of 0.7 to 1.3 mm and a depth of 13.5 to 14.5 mm on the hole forming surface of the mold material,
The drill is made of cemented carbide and has two tip cutting edges, two side cutting edges formed in a spiral shape from the outer peripheral end thereof, and chip discharge formed along the side cutting edges. A blade portion having a spiral groove portion and a shank portion held by the chuck of the rotating means are connected in the axial direction.
The core thickness in the blade part is 0.20 to 0.32 mm,
The length of the blade part is a value not less than a value obtained by adding a length twice the diameter to the depth of the supply hole, and a length of 20.0 mm or less.
The present invention relates to a drill for manufacturing a die for forming a honeycomb body, characterized in that an angle formed by the two tip cutting edges is 110 to 120 °.

  The drill for manufacturing a die for forming a honeycomb body of the present invention is made of cemented carbide. By using hard steel with high wear resistance, it is difficult for the drill to bend during the drilling process, and straightness can be ensured. Thereby, it can suppress that a hole bends and a processing surface becomes rough.

  While the above carbide is hard and has high wear resistance, it has the property of being brittle and easy to break. For this reason, as described above, it has not been put into practical use for the present invention. Here, in the present invention, by setting the core thickness at the blade portion of the drill to be 0.20 to 0.32 mm, the rigidity of the drill is increased, the ease of breaking of the super steel is covered, and chipping is prevented. Straightness can be ensured.

Moreover, the length of the said blade part is the length of 20.0 mm or less more than the length of the said supply hole added twice the diameter.
Thereby, it is possible to easily discharge the chips generated during the hole processing without reducing the strength of the drill.

The angle formed by the two tip cutting edges is 110 to 120 °.
Thereby, when making the said two front-end | tip cutting blade penetrate | invade into a metal raw material, it can put straightly, a straight advance can be obtained, and a hole bending can be suppressed.

  That is, using a hard, highly wear-resistant carbide as a material, a shape having all of at least three dimensional requirements at the same time: the core thickness, the length of the blade, and the angle formed by the two tip cutting edges. By using the drill, it is possible to maintain the rigidity over a long period of time, suppress chipping and breakage, ensure straightness, and scrape the mold material. Thereby, according to this invention, it can suppress that a hole bends and a processed surface becomes rough, and can form a highly accurate supply hole. Therefore, it is possible to provide a honeycomb body forming die manufacturing drill having a long cutting tool life, which can manufacture a honeycomb body forming mold with a uniform material extrusion amount.

According to a second aspect of the present invention, there is provided a method for manufacturing a die for forming a honeycomb body having a supply hole for supplying a material and a polygonal lattice-shaped slit groove for forming the material into a honeycomb shape in communication with the supply hole. Because
A hole machining step for forming the supply hole having a diameter of 0.7 to 1.3 mm and a depth of 13.5 to 14.5 mm on the hole forming surface of the mold material;
A groove processing step of forming the slit groove on a groove forming surface that is the surface opposite to the hole forming surface of the mold material,
The hole drilling step is performed by using the drill according to any one of claims 1 to 4 in a method for manufacturing a honeycomb body molding die (claim 5).

  In the manufacturing method, a hole forming step is performed using the above-described drill for manufacturing a honeycomb body forming die according to the first invention, so that the diameter is 0.7 to 1.3 mm and the depth is 13.5 to 14.5 mm. Thus, a honeycomb body mold can be manufactured in which uniform supply holes are formed and the amount of extrusion of the material is uniform. And since the said drill has a long lifetime, productivity can be improved significantly.

In the drill for manufacturing a die for forming a honeycomb body according to the first invention, the core thickness of the blade portion is 0.20 to 0.32 mm.
When the core thickness of the drill is less than 0.2 mm, there is a problem of causing damage to the drill. On the other hand, when the core thickness exceeds 0.32 mm, the cutting that occurs during drilling is caused. There is a problem that it is difficult to discharge the powder.
Moreover, the said core thickness is the minimum diameter of the drill center part which remains after processing a groove part.

Further, the length of the blade portion is not less than a value obtained by adding a length twice the diameter to the depth of the supply hole and not more than 20.0 mm.
If the length of the blade is less than the depth of the supply hole plus twice the diameter of the supply hole, there is a problem that it is difficult to discharge chips generated during drilling. is there. On the other hand, when the length of the blade portion exceeds 20.0 mm, there is a problem that the strength of the drill is weakened and it is easy to break.

The angle formed by the two tip cutting edges is 110 to 120 °.
When the angle formed is less than 110 °, there is a problem that the tip of the drill is chipped. On the other hand, when the angle formed is more than 120 °, there is a problem that the resistance is easily broken.

In the drill for manufacturing a die for forming a honeycomb body, it is preferable that the tip cutting edge is chamfered to provide a flat surface at a corner of the tip.
Thereby, chipping at the tip of the drill can be further suppressed.

Moreover, it is preferable that the said flat surface is 0.005-0.020 mm in width (Claim 3).
In this case, chipping of the drill can be suppressed particularly well.

  If the width of the flat surface is less than 0.005 mm, the chipping prevention improvement effect by chamfering may not be sufficiently obtained. On the other hand, if the width of the flat surface exceeds 0.020 mm, the tip There is a possibility that the cutting performance by the cutting edge is lowered.

Further, the shank portion has a diameter larger than that of the blade portion, and a tapered diameter difference portion is provided between the blade portion and the shank portion. The inclination angle is preferably 15 to 30 ° (claim 4).
In this case, the deflection and deflection of the drill can be suppressed, and bending at the diameter difference portion can be suppressed.

  When the angle of inclination of the diameter difference portion with respect to the axis is less than 15 °, it is difficult to suppress drill deflection and the accuracy of the formed supply hole may be reduced. When the inclination angle with respect to the heart exceeds 30 °, there is a risk of breakage from the angle starting point due to stress concentration.

In the method for manufacturing a die for forming a honeycomb body according to a second aspect of the present invention, it is preferable that the hole drilling step is performed by 1000 points or more by one drill.
In this case, the number of drill replacements can be reduced, the drill replacement time can be reduced, and the productivity of the honeycomb body forming die can be increased. Such a productivity improvement effect was achieved for the first time by successfully developing the excellent drill of the first invention.

(Example 1)
In this example, an embodiment relating to a method for manufacturing a honeycomb body forming mold using the honeycomb body forming mold manufacturing drill of the present invention will be described with reference to FIGS.

  In this example, as shown in FIGS. 1 to 3, a supply hole 2 for supplying a material and a slit groove 3 in a polygonal lattice shape for forming the material in a honeycomb shape in communication with the supply hole 2. A honeycomb body forming mold 1 having the above structure is manufactured. As is known from the figure, the supply holes 2 are provided at regular intervals at the intersections of the slit grooves 3.

In the manufacturing method of this example, the slit groove is formed on the groove forming surface which is the surface opposite to the hole forming surface of the mold material, and the hole forming step of forming the supply hole on the hole forming surface of the mold material. A grooving step.
This will be described in detail below.

In manufacturing the above-mentioned honeycomb body forming mold 1, a rectangular plate material having a thickness of 15.5 mm and a SKD61 material is prepared as the mold material (for convenience of explanation, this mold material is appropriately , Simply expressed as mold 1).
First, as shown in FIG. 4A, outer peripheral roughing was performed by cutting the outer peripheral portion so that the groove forming surface 12 of the mold 1 protrudes from the periphery.

  Next, as shown in FIG. 4B, the hole forming step was performed on the hole forming surface 11 which is the surface opposite to the surface on which the outer peripheral roughing was performed. In the hole machining step, a number of supply holes 2 having a hole diameter R of φ0.9 mm and a depth of 13.5 mm were formed on the hole forming surface 11 using a drill.

  Specifically, in this drilling step, a carbide drill 4 shown in FIGS. 5 to 8 was used as the drill. As shown in FIG. 5, the drill 4 is formed along two side cutting edges 52, two side cutting edges 52 formed spirally from the outer peripheral end thereof, and the side cutting edges 52. A blade portion 5 having a length of 17.5 mm having a spiral groove portion 53 for discharging chips and a shank portion 6 held by the chuck of the rotating means are connected in the axial direction.

Moreover, as shown in FIG. 6, the core thickness T in the said blade part 5 is 0.30 mm.
Moreover, as shown in FIG. 7, the angle α formed by the two tip cutting edges 51 is 120 °.
As shown in FIG. 8, the tip cutting edge 51 is connected to a first inclined surface 512 having an inclination β of 15 ° with respect to the vertical direction of the axis O, and the first inclined surface 512, and the axis O And a second inclined surface 513 having an inclination γ of 30 ° with respect to the vertical direction. The tip corner portion 514 is a portion formed by the first inclined surface 512 and the groove portion 53, and the tip corner portion 514 is chamfered to provide a flat surface 511 having a width U of 0.020 mm. is there.

The shank portion 6 has a diameter larger than that of the blade portion 5, and a tapered diameter difference portion 56 is provided between the blade portion 5 and the shank portion 6 to connect the two. The inclination angle of the portion 56 with respect to the axis is 15 °.
Further, in the hole drilling step, 1000 or more supply holes could be machined with one drill.

  Subsequently, in the heat treatment step, the mold 1 was subjected to a quenching process while holding the mold material at 1030 ° C. and then a tempering process at 600 ° C. (not shown).

Next, after finishing the outer peripheral surface of the mold 1 and the reference hole, the groove processing step was performed. As shown in FIG. 4C, in the grooving step, the slit groove 3 is formed on the groove forming surface 12 which is the surface opposite to the hole forming surface 11 of the mold 1 by using a disk-shaped grinding wheel (not shown). A large number of each was formed to form a square lattice. As shown in FIG. 3, the size of the slit groove 3 was set such that the groove width w was 0.06 to 0.3 mm and the groove depth h was in the range of 3.5 to 5.5 mm.
Next, as shown in FIG. 4 (d), the step of forming the outer peripheral shape of the groove processing surface 12 into a desired circular shape was performed to complete the processing step of the mold 1.

  Next, as shown in FIG. 4 (e), the mold adjustment step was performed. Specifically, the adjusting device 10 in which the mold 1 is brought into contact with the tip of the cylinder 101 and fixed by the fixing ring 102 is used. Specifically, a SiC abrasive fluid abrasive is put in the cylinder 101 as the polishing material 103 and pressed by the piston 104 to supply the material 103 to the supply hole 2 of the mold 1 and to form the slit groove 3. The mold was adjusted by the work of passing through and extruding from the groove forming surface 11.

The mold 1 (referred to as sample E1) obtained as described above can be a honeycomb body forming mold having a uniform material extrusion amount.
This is because, in particular, in the hole drilling process, the above-described drill for manufacturing a honeycomb body forming die is actively employed. The supply hole can be formed with high accuracy by performing the hole drilling process using the drill.
In the present example, the slit grooves are formed in a square lattice shape, but the same effect can be obtained even when hexagonal slit grooves are formed.

(Comparative Example 1)
In this example, a comparative example according to the drill for manufacturing a die for forming a honeycomb body of the present invention will be described.
This invention is the example which changed the drill of Example 1 into the high-speed drill which consists of SKH-51.
As shown in FIG. 9, the high-speed drill has two tip cutting edges 81, two side cutting edges 82 formed in a spiral shape from the outer peripheral end thereof, and chips formed along the side cutting edges. A blade portion 84 having a length of 15 mm having a spiral groove portion 83 for discharge and a shank portion 85 held by the chuck of the rotating means are connected in the axial direction.
Moreover, the core thickness in the said blade part 84 is 0.3 mm. The angle ω formed by the two tip cutting edges 81 is 130 °.
The shank portion 85 has a diameter larger than that of the blade portion 84, and a tapered diameter difference portion 86 is provided between the blade portion 84 and the shank portion 85 to connect the two. The inclination angle of the portion 86 with respect to the axis is 15 °.
Others were performed in the same manner as in Example 1.
In this example, the number of supply holes that could be processed by one drill in the hole processing step was approximately 200 points.
The mold obtained in this example is designated as sample C1.

(Experimental example 1)
By measuring the straightness (waviness), hole diameter, hole bending, and surface roughness of the supply holes for the honeycomb molded body molds (sample E1 and sample C1) produced in Example 1 and Comparative Example 1, The processing accuracy of the supply hole was evaluated.
FIG. 10A shows a cross section of the supply hole portion of the sample E1, and FIG. 10B is a drawing substitute photograph showing a cross section of the supply hole portion of the sample C1.

In the sample E1 which is an embodiment of the present invention, the straightness (swell) of the supply hole 2 is 0.005 to 0.008 mm / 13 mm, the hole diameter is 0.9 mm ± 10 μm, and the hole bending is 0.005. It was -0.040mm / 13mm, and the surface roughness of the supply hole was 6-9micrometer Ry.
As can be seen from FIG. 10B, the sample C1 as a comparative example of the present invention is visually observed that the swell of the supply hole 208 is larger than that in the case of E1. Specifically, the straightness (swell) of the feed hole 208 is 0.007 to 0.040 mm / 13 mm, the hole diameter is 0.9 mm ± 30 μm, and the hole bend is 0.005 to 0.080 mm / 13 mm. The surface roughness of the supply hole was 6 to 27 μm Ry.
Thereby, according to this invention, it turns out that a supply hole can be formed with high processing precision.

(Experimental example 2)
Next, a honeycomb body was manufactured using the sample E1.
Specifically, an extrusion molding step of obtaining a honeycomb molded body by extruding a ceramic raw material obtained by kneading at least a raw material powder and water using an extrusion molding apparatus 9 shown in FIG. A drying process for drying and a heat treatment process for obtaining a honeycomb body by performing a heat treatment were performed.

The obtained honeycomb body includes an outer skin, partition walls arranged in a honeycomb shape in the outer skin, and a large number of cells that are partitioned in the partition walls and formed along the axial direction so as to penetrate both ends. Have.
The honeycomb body has a diameter of φ103 mm, a height of 130 mm, a partition wall thickness of 0.09 mm, and a cell pitch, that is, a side length of 1.27 mm. In addition, the size of the honeycomb body obtained by this example is an example, and is not limited to this.

  As shown in FIG. 11, the extrusion molding apparatus 9 has an inlet 92 that faces a kneading machine 91 provided at the upper side, and an upper screw 93, an extrusion screw portion 94, and the upper screw 93 below the inlet 92. And an extrusion screw portion 94, a vacuum chamber 95 and a biting roller 96 are provided. The extrusion screw portion 94 includes a circular sleeve 97 and a screw 98 that kneads the ceramic raw material and advances the ceramic raw material in the sleeve 97.

A resistance tube 99 for gradually reducing the cross-sectional area through which the ceramic raw material extruded from the extrusion screw portion 94 passes is provided in front of the extrusion screw portion 94. Further, a honeycomb body forming die 1 (sample E1) for forming the ceramic raw material extruded from the resistance tube 99 into a honeycomb shape is disposed in front of it. A guide ring 90 is disposed in the honeycomb body forming mold 1.
Moreover, although the extrusion molding apparatus 9 of this example has the upper stage screw 93 and the extrusion screw part 94, you may provide a middle stage screw between the upper stage screw 93 and the extrusion screw part 94 further.

Next, a method for manufacturing a honeycomb body will be described.
First, raw material powder and water were kneaded by a kneader 91 to obtain a ceramic raw material. Thereafter, the ceramic raw material is charged from the kneading machine 91 into the raw material charging port 92, and this is fed into the extrusion screw portion 94 via the vacuum chamber 95 and the biting roller 96 by the propulsive force by the rotation of the upper screw 93. It is.

Thereafter, the ceramic raw material is extruded from the extrusion screw portion 94, the passage cross-sectional area is gradually reduced in the resistance tube 99, extruded from the honeycomb body molding die 1, and passed through the guide ring 90, thereby forming the honeycomb molded body. Molded.
Next, the honeycomb formed body is cut into a predetermined length. Then, the separated individual honeycomb formed bodies were left as they were for 1 hour to perform a drying process.
After the drying process was completed, the honeycomb formed body was transported into a firing furnace and fired. Firing was performed under the condition of holding at a temperature of 1400 ° C. for 5 hours to obtain a honeycomb body.

Next, a honeycomb body was manufactured using the sample C1.
The honeycomb mold 1 (sample E1) was changed to the sample C1. Others were performed in the same manner as in Sample E1.

FIG. 12 shows a state in which the honeycomb formed body 71 starts to appear when the honeycomb body 7 is manufactured using the sample E1 and the sample C1 (state of the leading surface S extruded from the mold after starting the extrusion molding). .
FIG. 12A shows a state where the honeycomb formed body 71 starts to appear when the sample E1 is used, and FIG. 12B shows a state where the honeycomb formed body 71 starts when the sample C1 is used. It is a photograph.
As can be seen from FIG. 12, when the sample E1 as an example of the present invention is used for production, compared with the case of using the sample C1 as a comparative example of the present invention, the start-up state (first surface) There are few irregularities of S). Therefore, according to the present invention, it is understood that the material flowability of the honeycomb body forming mold is good and the material supply amount is stable.

FIG. 13 shows a state in which the inside of the product of the obtained honeycomb body 7 is observed through light transmission in the axial direction.
FIG. 13A shows the inside of the product of the honeycomb body 7 manufactured using the sample E1, and FIG. 13B is a drawing substitute photograph showing the inside of the product of the honeycomb body 7 manufactured using the sample C1. It is.
As can be seen from FIG. 13, when the sample E1 is used as an example of the present invention, the cloudy 79 is less than that of the sample C1 as a comparative example of the present invention. . Thereby, according to this invention, it turns out that the precision of a supply hole is favorable and the honeycomb body 7 can be manufactured without a deformation | transformation.

  As a result, according to the present invention, it is possible to provide a honeycomb body forming die manufacturing drill having a long cutting tool life and capable of manufacturing a honeycomb body forming mold having a uniform material extrusion amount. .

FIG. 3 is an explanatory view showing a honeycomb body forming mold in Example 1. FIG. 2 is a top view showing a honeycomb body-forming mold in Example 1. 1 is a cross-sectional view showing a honeycomb body forming mold in Example 1. FIG. FIG. 3 is an explanatory view showing a method for manufacturing a honeycomb body forming mold in the first embodiment. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing a drill for manufacturing a die for forming a honeycomb body in Example 1; The front view which shows the front end surface of the drill for die manufacture for honeycomb body shaping | molding in Example 1. FIG. The enlarged view which shows the front-end | tip part of the drill for honeycomb body shaping | molding die manufacture in Example 1. FIG. Sectional drawing which shows the front-end | tip cutting edge of the drill for honeycomb body shaping | molding die manufacture in Example 1. FIG. Explanatory drawing which shows the high speed drill in the comparative example 1. FIG. The drawing substitute photograph which shows the supply hole of the metal mold | die for honeycomb body shaping | molding in Experimental example 1. FIG. Explanatory drawing which shows the extrusion molding apparatus of the honeycomb body in Experimental example 1. FIG. FIG. 3 is a drawing-substituting photograph showing a state in which a honeycomb formed body starts to appear in Experimental Example 1. The drawing substitute photograph which shows the product inside of the honeycomb body in Experimental example 1. FIG.

Explanation of symbols

4 Drill for manufacturing a die for forming a honeycomb body 5 Blade part 51 Tip cutting edge 52 Side cutting edge 53 Groove part 6 Shank part

Claims (6)

In manufacturing a die for forming a honeycomb body having a supply hole for supplying a material and a polygonal lattice-shaped slit groove for forming the material into a honeycomb shape in communication with the supply hole, A drill for use in performing a hole machining step for forming the supply hole having a diameter of 0.7 to 1.3 mm and a depth of 13.5 to 14.5 mm on a hole forming surface,
The drill is made of cemented carbide and has two tip cutting edges, two side cutting edges formed in a spiral shape from the outer peripheral end thereof, and chip discharge formed along the side cutting edges. A blade portion having a spiral groove portion and a shank portion held by the chuck of the rotating means are connected in the axial direction.
The core thickness in the blade part is 0.20 to 0.32 mm,
The length of the blade part is a value not less than a value obtained by adding a length twice the diameter to the depth of the supply hole, and a length of 20.0 mm or less.
The drill for manufacturing a die for forming a honeycomb body, characterized in that an angle formed by the two tip cutting edges is 110 to 120 °.   The drill for manufacturing a die for forming a honeycomb body according to claim 1, wherein the tip cutting edge is chamfered to provide a flat surface at a corner of the tip.   The drill for manufacturing a die for forming a honeycomb body according to claim 2, wherein the flat surface has a width of 0.005 to 0.020 mm.   The diameter of the said shank part is larger than the said blade part in any one of Claims 1-3, The taper-shaped diameter difference part which connects both is provided between this blade part and the said shank part. A drill for manufacturing a die for forming a honeycomb body, wherein an inclination angle of the diameter difference portion with respect to an axis is 15 to 30 °. A method for manufacturing a die for forming a honeycomb body having a supply hole for supplying a material and a slit in a polygonal lattice shape for forming the material into a honeycomb shape in communication with the supply hole,
A hole machining step for forming the supply hole having a diameter of 0.7 to 1.3 mm and a depth of 13.5 to 14.5 mm on the hole forming surface of the mold material;
A groove processing step of forming the slit groove on a groove forming surface that is the surface opposite to the hole forming surface of the mold material,
The said hole drilling process is performed using the drill as described in any one of Claims 1-4, The manufacturing method of the metal mold | die for honeycomb body formation characterized by the above-mentioned.   6. The method for manufacturing a die for forming a honeycomb body according to claim 5, wherein in the hole drilling step, 1000 or more points are processed by one drill.