JP4866472B1 - Die and manufacturing method thereof - Google Patents

Abstract

An object of the present invention is to provide a lip portion composed of a HIP layer diffusion-bonded to a base material of a die body by HIP treatment, thereby making the lip portion structure dense, greatly improving bending strength, and increasing surface roughness. Provided is a die that can be finished with high accuracy, the edge portion is finished with a sharp edge with high accuracy, and the die flow path other than the lip portion has good corrosion resistance and wear resistance.
Lips 6 and 6 are provided on the front end side of a die flow path 5 formed in a die body 4, and a die for discharging a coating liquid or molten resin supplied to the die flow path 5 from the lip part 6. The lip portion 6 is formed by the HIP layer 10 in which an alloy powder having good corrosion resistance and wear resistance is directly diffused and bonded to the base material of the die body 4 by HIP processing. A hard chrome plating layer 20 is coated on the inner wall surface of the die body 4 that forms 5.
[Selection] Figure 1

Description

  The present invention provides a die having a lip portion provided on the tip end side of a die flow path formed in a die body, and discharging a coating liquid or a molten resin supplied to the die flow path from the lip portion ( Coating die or T die) and a manufacturing method thereof.

  The resin film produced by an extruder using a T die is required to have no thickness deviation or streak-like defects particularly for those used for optical applications. For this reason, the die flow path, which is the flow path of the molten resin, has a smooth inner wall surface so that no stagnation occurs, and in particular, the lip portion from which the molten material is discharged has a sharp edge at the tip. It is desired to be formed of a material having high hardness, strength, and wear resistance so as not to be scratched or worn.

  Conventionally, the inner wall surface of the die channel is subjected to hard chrome plating to reduce friction with the molten resin, while the lip portion can be coated with high hardness and high wear resistance carbide by, for example, thermal spraying. Proposed. However, if hard chrome plating is applied to the inner wall surface of the die flow path and the lip portion is coated with carbide, cracks occur in the plating layer due to poor adhesion of the hard chrome plating at the tip of the lip portion. As a result, the resin film to be molded is damaged. For this reason, if the thermal spraying is performed after the plating layer is peeled off by grinding or the like after the plating process, cracks occur at the joint between the plated part and the thermal sprayed part, and it is easy to cause poor connection. May interfere with flow. In addition, when coating the carbide by thermal spraying, the powdered carbide material mainly composed of WC is melted and sprayed. Therefore, when the edge part is finished by applying grinding / polishing after spraying, Particle peeling and cracking are likely to occur.

  In view of this, a T die in which the lip portion is formed of a cemented carbide and is attached to the die body has been conventionally proposed. In this way, according to the T die in which the lip portion made of cemented carbide is attached to the die body, the above-mentioned peeling and cracking are not caused, and high wear resistance, corrosion resistance, and strength can be obtained.

  However, in the coating die in which the cemented carbide lip member as described above is attached to the die body, fine pores remain in the sintered body, and when this crystal is ground, many pinholes are observed. Therefore, there is a problem in terms of surface roughness, and it cannot be used in a liquid crystal display panel manufacturing process that requires high-precision coating. Cemented carbide lip members are joined to the die body, which is the base material, by brazing or welding. Because of its large deformation, it cannot be used in the manufacturing process of a liquid crystal display panel that requires high accuracy as described above.

  In view of the above circumstances, the present invention replaces the lip member made of cemented carbide with the HIP (abbreviation of Hot Isostatic Pressing, referred to as hot isostatic pressing) treatment to form a die body with an arbitrary thickness. By forming a lip part consisting of a HIP layer in which powder alloy is directly diffusion bonded to the material, the structure of the lip part is densified, the surface roughness can be finished with high accuracy, the strength of the joint part is reduced, and joint defects It is an object of the present invention to provide a die and a manufacturing method thereof in which the edge portion is finished with a high-precision sharp edge and the corrosion resistance and wear resistance are good.

  Means for solving the above problems will be described with reference numerals in the embodiments described later. The invention according to claim 1 is the lip portion 6 on the tip side of the die flow path 5 formed in the die body 4. , 6, and dies 1 and 11 for discharging the coating liquid or molten resin supplied to the die flow path 5 from the lip portion 6, the lip portion 6 having corrosion resistance and wear resistance by HIP treatment. The hard chromium plating layer 20 or electroless is formed on the inner wall surface of the die body 4 formed by the HIP layer 10 in which a good alloy powder is directly diffusion bonded to the base material of the die body 4 and forms the die flow path 5 other than the lip portion 6. A nickel plating layer is coated.

  According to a second aspect of the present invention, in the die according to the first aspect, the HIP-treated alloy powder is made of a nickel-based alloy or a cobalt-based alloy.

  According to a third aspect of the present invention, in the die according to the first or second aspect, the base material of the die body 4 is made of an austenite / ferrite duplex stainless steel.

  The invention according to claim 4 is the die manufacturing method according to any one of claims 1 to 3, wherein the lip portion 6 is made of an alloy powder having good corrosion resistance and wear resistance by HIP treatment. The hard chrome plating layer 20 or the electroless nickel plating layer is coated on the inner wall surface of the die body 4 that forms the die flow path 5 other than the lip portion 6. Features.

  The effect of the invention by the above solution will be described with reference numerals of the embodiments described later. According to the invention of claim 1, the lip portion 6 is an alloy having good corrosion resistance and wear resistance by HIP treatment. Since the powder is formed by the HIP layer 10 in which the powder is diffusion-bonded to the base material of the die body 4 with an arbitrary thickness, the structure of the lip portion 8 is densified by the HIP treatment of the alloy powder, and a cemented carbide sintered body. No pores remain inside, no pinholes are generated during grinding or lapping, and the surface roughness of the lip portion 6 is greatly improved without the occurrence of joint strength reduction or bond defects. In addition, the edge portion can be finished to a sharp edge. Further, if all the die flow paths 5 are formed by the HIP layer 10, the die manufacturing cost will be very high, but the inside of the die body 4 that forms the die flow path 5 other than the lip portion 6. The wall is coated with a hard chrome plating layer 20 or electroless nickel plating layer that is much cheaper than HIP treatment, so that friction with the coating solution or molten resin can be reduced while reducing die manufacturing costs. Is achieved.

  Hard chrome plating has a small coefficient of friction, very good sliding, is hard to adhere to other substances, and has rust prevention, reducing friction with molten resin and coating liquid, and friction Even when a strong molten resin or coating solution is used, the wetted part of the die flow path 5 is not damaged and worn, and can be used permanently. Further, the electroless nickel plating layer has good adhesion to the base material and has excellent wear resistance equivalent to that of the hard chrome plating layer 20.

  Moreover, since the lip portion 6 is formed by the HIP layer 10 in which the alloy powder is diffusion-bonded to the base material of the die body 4 at an arbitrary thickness by HIP processing, the cemented carbide lip portion is used as the base material. Compared to the lip portion that is mounted, the bonding strength with the base material is significantly increased. Moreover, since the HIP layer 10 forming the lip portion 6 has a thickness of at least several millimeters to several tens of millimeters, it can be used repeatedly by repair grinding.

  When the alloy powder to be HIP-treated is made of a nickel-based alloy or a cobalt-based alloy as in the invention according to claim 2, the corrosion resistance is further improved.

  When the base material of the die body is made of austenite / ferrite duplex stainless steel as in the invention according to claim 3, the thermal expansion coefficient of the alloy powder that is diffusion bonded to the base material of the die body by HIP treatment is close. The bending deformation due to the thermal expansion difference is reduced.

  According to the die manufacturing method according to claim 4, the lip portion 6 of the die body 4 is diffusion-bonded to the base material of the die body 4 with an arbitrary thickness by the HIP treatment with the alloy powder having good corrosion resistance and wear resistance. Since it is formed by the HIP layer 10, the structure of the lip portion 8 is densified by the HIP treatment of the alloy powder, and pores do not remain inside like the cemented carbide sintered body, and the pin is used during grinding and lapping. There is no generation of holes, no reduction in the strength of joints and no occurrence of bonding defects, the surface roughness of the lip portion 6 is greatly improved, and the edge portion can be finished to a sharp edge. Further, if all the die flow paths 5 are formed by the HIP layer 10, the die manufacturing cost will be very high, but the inner wall surface of the die body 4 that forms the die flow path 5 other than the lip portion 6. Since the hard chromium plating layer 20 or the electroless nickel plating layer which is much cheaper than the HIP treatment is coated, the friction with the coating liquid or the molten resin can be reduced while the die manufacturing cost is reduced. Can be achieved.

The T-die which concerns on this invention is shown, (a) is the front view which looked at one die of the die main body which consists of a pair of die from the mating surface side, (b) is the sectional view on the AA line of (a). (C) is a cross-sectional view of a T die formed by butting a pair of dies to form a die body. (a) is sectional drawing which shows the coating die which concerns on this invention, (b) is BB sectional view taken on the line of (a), (c) is CC sectional view taken on the line of (a). (a)-(d) is explanatory drawing explaining a HIP process. The manufacturing method of a coating die is shown. (A-1) is a front view of one die material having a lip portion formed by a HIP layer on the inner wall tip, as viewed from the mating surface side. ) Is a cross-sectional view of the die material, (b-1) is a front view of the undercut die material, (a-2) is a cross-sectional view, and (c-1) is the inner wall surface of the die material. A front view of the state in which the hard chrome plating layer is almost entirely covered, (c-2) is a sectional view thereof. (a) is a cross-sectional explanatory view of a die material showing a grinding line for grinding to make the HIP layer and the hard chromium plating layer flush with each other, and (b-1) is a front view of the die member after grinding. FIG. 2B is a cross-sectional view thereof, and FIG. 2C is a cross-sectional view of a coating die including a die body 4 formed by a pair of die members being brought into contact with each other.

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 (c) shows a T die 1 which is an embodiment of a die according to the present invention. The die body 4 is composed of a pair of die members 2, 3, the die channel 5 is formed between the die members 2, 3, and the lip portions 6, 6 are provided on the tip side of the die channel 5. A manifold 7 is provided on the rear end side of the die flow path 5, and a molten resin inflow port 8 is provided in the center of the manifold 7. Therefore, in the T die 1, the molten resin flowing in from the inlet 8 flows into the lip channel portion 9 in a state where it is once stored in the manifold 7 and expanded in the die width direction, and the lip portion 6, By being discharged from the lip port 17 through the gap 6, it is pushed out into a film shape. (A) of FIG. 2 is the front view which looked at one die member 2 from the mating surface side, and is the sectional view on the AA line of (b) (a).

  The feature of the T die 1 is that each lip portion 6 is diffusion bonded to the die members 2 and 3 as the base material by alloy powder having good corrosion resistance and wear resistance by HIP (hot isostatic pressing) treatment. The HIP layer 10 is formed by the hard chrome plating layer 20 on the inner wall surface of the die members 2 and 3 that form the die flow path 5 other than the lip portion 6. Is shown with a satin pattern.

  FIG. 2 shows a coating die 11 which is another embodiment of the die according to the present invention. The coating die 11 has a die body 4 composed of a pair of upper and lower die members 2 and 3. A die flow path 5 is provided between the die members 2 and 3, and a coating liquid supply path 14 to which a coating liquid is supplied from the outside and a coating liquid from the supply path 14 are supplied to the lower die member 3. Once stored, a manifold 7 is provided which extends in the die width direction. The coating liquid supply path 14 and the manifold 7 form a part of the die flow path 5, and lip portions 6 and 6 are provided on the tip end side of the die flow path 5.

  On the mating surfaces of both die members 2 and 3, a thickness formed in a substantially U-shape in plan view with a base portion 15a and both sleeve portions 15b and 15b at a position facing the rear side of the manifold 7 and both ends in the width direction. A t-liner 15 is attached, and the thickness between the upper surface 3o of the lower die member 3 and the lower surface 2o of the upper die member 2 is t and width except for the portion closed by the U-shaped liner 15. Forms a lip channel portion 9 of W1 (see FIGS. 2A to 2C), and the coating liquid is discharged from the lip port 17 of the lip portion 6 located at the tip of the lip channel portion 9. It is like that.

  In this coating die 11 as well, each lip portion 6 is diffusion-bonded to the die members 2 and 3 which are base materials by alloy powder having good corrosion resistance and wear resistance by HIP (hot isostatic pressing) treatment. It is characterized in that a hard chrome plating layer 20 is coated on the inner wall surface of the die body 4 which is formed by the HIP layer 10 and forms the die flow path 5 other than the lip portion 6. The HIP layer 10 is shown in a satin pattern in (a) to (c) of FIG.

  Next, the manufacturing method of the coating die 11 among the T die 1 and the coating die 11 described above will be described with reference to FIGS.

  3 (a) to 3 (d) are explanatory views for explaining the HIP process, and FIG. 4 (a-1) has a HIP layer 10 formed by HIP treatment of alloy powder at the tip of the inner wall surface. Front view of one die material 12 viewed from the mating surface side, (a-2) is a sectional view of the die material 12, (b-1) is a front view of the undercut die material 12, (a- 2) is a cross-sectional view, (c-1) is a front view of a state in which the hard chrome plating layer 20 is coated on substantially the entire inner wall surface of the die material 12, and (c-2) is a cross-sectional view thereof. Since the upper and lower die materials 12 and 13 are manufactured by the same method, only one die material 12 is shown in (a-1) to (b-2), and the other die member 13 is omitted. .

  The die materials 12 and 13 are preferably SUS329J1-4 (austenite / ferrite two-phase stainless steel) having a thermal expansion coefficient close to that of the nickel-based alloy powder or cobalt-based alloy powder used for the alloy powder of the HIP layer 10.

  Further, in order to manufacture a die that is cheaper in terms of material, the cost can be further reduced by using an SCM440-based material as the material of the die materials 12 and 13 as the base material. Further, by using SCM435 or 440 structural alloy steel as a base material, the hard chrome plating process is effectively utilized.

  As shown in (a-1) and (a-2) of FIG. 4, a method of forming the HIP layer 10 by HIP treatment of the alloy powder on the inner wall tips of the die materials 12 and 13 is shown in FIG. Referring to FIG. 3 (d), first, as shown in FIG. 3 (a), the alloy powder recesses 31 and 31 formed at the respective tip portions of the die materials 12 and 13 on the mating surface side are provided. Both die materials 12 and 13 are butted together in a state where the core dies 32 and 32 coated with a heat-resistant release material are accommodated, and both the die materials 12 and 13 that are butted together are temporarily fixed by welding. The alloy powder recesses 31 and 31 of the die materials 12 and 13 are filled with the alloy powder 35 having good corrosion resistance and wear resistance from the powder supply port 34 of the capsule 33, and the powder supply port 34 is closed. Then, it is deaerated and sealed, and the state shown in FIG.

  As the alloy powder having good corrosion resistance and wear resistance, nickel-based alloy powder or cobalt-based alloy powder is used. A preferable nickel-based alloy powder has a constituent element ratio of 69.75% by weight of nickel, 16.5% by weight of chromium, 3.3% by weight of boron, 4.0% by weight of silicon, 0.65% by weight of carbon, It consists of 3.5 wt% iron, 3.0 wt% molybdenum and 2.3 wt% copper. Other preferred nickel-based alloy powders are 58.2% nickel, 18.0% chromium, 3.3% boron, 3.7% silicon, 0.8% carbon, 1.5% iron. And 2.5% by weight molybdenum and 12.0% by weight tungsten. Still another preferred nickel-based alloy powder is nickel 50.05% by weight, chromium 19.0% by weight, boron 3.0% by weight, silicon 3.1% by weight, carbon 0.85% by weight, iron 1.5% by weight. %, Molybdenum 2.5% by weight and tungsten 20.0% by weight. On the other hand, the preferred cobalt-based alloy powder has a constituent element ratio of 45.7 wt% cobalt, 19.0 wt% chromium, 15.0 wt% tungsten, 1.3 wt% copper, 13.0 wt% nickel. %, Boron 3.0% by weight and silicon 3.0% by weight.

Then, the capsules 33 are placed in the processing chamber 37 of HIP (hot isostatic pressing) apparatus as shown in (b) of FIG. 3, for example 1300 ° C., HIP treated at high pressure and high temperature of 1300 kgf / cm ² As shown in FIG. 3 (c), the HIP layer 10 in which the alloy powder is diffusion bonded to the inner wall surface tips of the die materials 12 and 13 is formed. This HIP layer is a hard layer having a hardness HRC of 57 to 72 made of a nickel-based alloy or a cobalt-based alloy having a constituent element ratio as described above.

  The capsule 33 in which the HIP layer 10 is formed at the tip of the inner wall surface of each of the die materials 12 and 13 by HIP processing as described above is disassembled as shown in FIG. After the child mold 32 is removed, it is appropriately cut and cut so as to have a required shape to obtain the state shown in FIG. The HIP layer 10 portion of the die materials 12 and 13 becomes the lip portion 6 of the die members 2 and 3. In addition, in the die materials 12 and 13 shown in FIG. 3 (d) and the die materials 12 and 13 shown in FIGS. 4 (a-1) and (a-2), the positional relationship of the formed HIP layer 10 is shown. Is upside down.

  As shown in (a-1) and (a-2) of FIG. 4, the die materials 12 and 13 in which the HIP layer 10 is formed at the tip on the inner surface side include the die materials 12 other than the HIP layer 10 that becomes the lip portion 6. , 13 An undercut process with a required cut amount w as shown in FIG. 4 (b-2) for performing the hard chrome plating process, which is a surface process, is performed by cutting. In FIG. 4B-2, the undercut portion is indicated by 16. As shown in the figure, this undercut process is also performed on the portion of the HIP layer 10 that borders the die materials 12 and 13, and therefore the undercut portion 16 includes a part of the HIP layer 10. The undercut amount w in the undercut process can be appropriately set in consideration of the thickness of the plated layer 20 of hard chrome plating performed thereafter.

  The hard chrome plating is performed so that the hard chrome plating layer 20 is covered over the entire inner surface side of the die materials 12 and 13 subjected to the undercut treatment as described above and a part of the HIP layer 10. c-1) and (c-2). Since the thickness of the plated layer 20 is ground after this, it is sufficiently thicker than the final thickness, for example, about 100 μm. In this case, plating preventive means can be appropriately applied to the unnecessary portions of the die materials 12 and 13 and the HIP layer 10. Alternatively, the die materials 12 and 13 and the HIP layer 10 may be plated so as to be covered with the hard chrome plating layer 20, and a plating unnecessary portion may be removed by a grinding process or the like in a later process.

  Thus, after the hard chrome plating layer 20 is coated over the entire inner surface side of the die materials 12 and 13 and a part of the HIP layer 10 forming the lip portion 6, the hard chrome plating coated on the inner surfaces of the die materials 12 and 13 is performed. Grinding is performed so that the layer 20 and the HIP layer 10 are flush with each other. In the sectional view of FIG. 5 (a), the final grinding line is indicated by G. By grinding the hard chromium plating layer 20 and the HIP layer 10 up to this line G, (b-1) and (b− As shown in 2), the hard chromium plating layer 20 on the inner surface side of the die materials 12 and 13 and the HIP layer 10 forming the lip portion 6 can be flush with each other. Thereafter, mirror grinding or mirror finishing is performed as necessary.

  After finishing the chromium plating layer 20 on the inner surface side of the die materials 12 and 13 and the HIP layer 10 of the lip 6 as described above, the entire die materials 12 and 13 are cut into a required shape, ground and mirrored ( By including a buff), the upper die member 2 and the lower die member 3 for the coating die are formed, and the coating liquid supply path 14 and the manifold 7 are formed in the lower die member 3. 5 (c), the upper die member 2 and the lower die member 3 are brought into contact with each other to form the die body 4, and the die channel 5 is formed in the die body 4. The coating die 11 manufactured by forming the lip | rip parts 6 and 6 of the front end side of this is shown.

  In order to manufacture the T die 1 and the coating die 11 by the method of the present invention, basically, as in the embodiment of the manufacturing method of the coating die 11 described with reference to FIGS. After the HIP process and the hard chrome plating process are performed on the die 13, the entire die material 12, 13 is processed to form the final-shaped coating die 11, but before the HIP process and the plating process, the shape process is performed. May be performed. In that case, it is necessary to perform shape processing after calculating the residual state of the HIP layer 10 and the residual state of the hard chromium plating layer 20 on the die materials 12 and 13.

  As described above, before the hard chrome plating process, the die material including the HIP layer 20 is processed by machining or grinding from the resin flow port to the leading edge of the outlet when a T die is manufactured. After completing the above, hard chrome plating is performed. In this case, taking into account the residual amount of the hard chrome plating layer, machining and grinding before plating are performed (see (b-1) and (b-2) in FIG. 4). After the hard chrome plating treatment, the hard chrome plating layer 20 and the HIP layer 10 are ground to the same level as described in FIGS. 5 (b-1) and (b-2). What is necessary is just to perform mirror surface lapping. Further, the three-dimensional manifold part and the flow part of the molten resin or coating liquid can be mirror-finished by buffing the hard chrome plating treatment part.

  According to the T die 1 and the coating die 11 according to the present invention described above, the lip portion 6 of the die main body 4 is made of an alloy powder having good corrosion resistance and wear resistance by the HIP process. Therefore, the structure of the lip portion 8 is densified by the HIP treatment of the alloy powder, and pores may remain inside like a cemented carbide sintered body. There is no occurrence of pinholes during grinding or lapping, there is no reduction in the strength of joints and no occurrence of bonding defects, the surface roughness of the lip part 6 is greatly improved, and the lip part 6 as an edge part. The lip port 17 can be finished with a sharp edge of 1 μm. Incidentally, the surface roughness of the lip portion 6 can be finished to Ry 0.1 μm at the lip port 17 which is the edge portion of the lip portion 6, and the surface roughness can be further reduced in the lapping.

  Further, if the die flow path 5 of the die body 4 is entirely formed by the HIP layer 10, the die manufacturing cost will be very high, but as in the dies 1 and 11 according to the present invention, By forming only the lip part 6 with the HIP layer 10 and coating the inner wall surface of the die body 4 forming the die flow path 5 other than the lip part 6 with hard chrome plating much cheaper than the HIP process, The die manufacturing cost can be reduced.

  Hard chrome plating has a small coefficient of friction, very good sliding, is hard to adhere to other substances, and has rust prevention, reducing friction with molten resin and coating liquid, and friction Even when a strong molten resin or coating solution is used, the wetted part of the die flow path 5 is not damaged and worn, and can be used permanently.

  Further, the lip portion 6 is formed by the HIP layer 10 formed by diffusion bonding the alloy powder with the base material of the die body 4 at an arbitrary thickness by HIP processing, and therefore, the lip portion 6 is configured by attaching a cemented carbide product. Compared with the lip portion, the bonding strength with the base material is remarkably increased. Further, since the HIP layer 10 forming the lip portion 6 has a thickness of at least several millimeters to several tens of millimeters, it can be used repeatedly by repair grinding and can be processed any number of times until the HIP layer 10 disappears. The hard chrome plating layer 20 can be restored at low cost.

  In the above embodiment, the hard chrome plating layer 20 is coated on the inner wall surface of the die body 4 that forms the die flow path 5 other than the lip portion 6, but instead of the hard chrome plating layer 20, electroless nickel is used. A nickel plating layer may be formed on the inner wall surface of the die body 4 that forms the die flow path 5 other than the lip portion 6 by plating. Electroless nickel plating is a plating process that does not use electricity. The plating film thickness is uniform, so it is suitable for those with complex shapes and dimensional accuracy if the plating solution is immersed. Yes. The plating layer formed by this electroless nickel plating treatment has good adhesion to the base material, the plating film thickness is uniform, and has excellent wear resistance equivalent to that of the hard chrome plating layer 20, and also Corrosion resistance is also excellent.

DESCRIPTION OF SYMBOLS 1 Coating die 2 Upper die member 3 Lower die member 4 Die main body 5 Die flow path 6 Lip part 7 Manifold 9 Lip flow path part 10 HIP layer 11 Coating die 12, 13 Die raw material 20 Hard chromium plating layer

Claims (4)

  A die having a lip portion provided on the tip end side of a die flow path formed in the die body and discharging a coating liquid or a molten resin supplied to the die flow path from the lip portion, wherein the lip portion is HIP treated Is formed by an HIP layer obtained by direct diffusion bonding of an alloy powder having good corrosion resistance and wear resistance to the base material of the die body, and a hard chromium plating layer or no coating is formed on the inner wall surface of the die body forming a die flow path other than the lip portion. A die characterized in that an electrolytic nickel plating layer is coated.   The die according to claim 1, wherein the alloy powder to be subjected to HIP treatment is made of a nickel-based alloy or a cobalt-based alloy.   3. The die according to claim 1, wherein the base material of the die body is made of austenite / ferrite duplex stainless steel.   The die manufacturing method according to any one of claims 1 to 3, wherein the lip portion is formed by direct diffusion bonding of an alloy powder having good corrosion resistance and wear resistance to the base material of the die body by HIP treatment. A die manufacturing method characterized in that a hard chrome plating layer or an electroless nickel plating layer is coated on the inner wall surface of a die body which is formed by a layer and forms a die flow path other than a lip portion.

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