JP2013121571A - Die and manufacturing method of die - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a die in which an HIP bar in which an HIP layer is provided for a support that forms a part of a die member is allowed to connect with the die member, thereby, a large-scale HIP apparatus is unnecessary, and the reduction of the manufacturing cost of a die product can be attained.SOLUTION: In the die that has lip parts L and L at the end of a die channel 24 formed between two or more die members 5 and 5, and in which a coating liquid or a molten resin supplied to the die channel 24 is discharged from the lip part L; the die member 5 includes a die body part 4 and an HIP bar 3, the HIP bar 3 includes: a support 2 of a material that is the same or similar as the die body part 4; and an HIP layer 1 in which an alloy powder excellent in corrosion resistance and wear resistance is performed by direct diffusion connection to the support 2 by an HIP treatment, wherein the support 2 of the HIP bar 3 is connected to the end side of the die body part 4 by welding, and the lip part L is formed by the HIP layer 1.

Description

  The present invention provides a die having a lip portion at a tip end portion of a die flow path formed between a plurality of die members, and discharging a coating liquid or molten resin supplied to the die flow path from the lip portion ( Coating die or T die) and a die manufacturing method.

  Conventionally used coating dies include a cemented carbide lip member attached to the tip side of the die flow path formed between the die members. Thus, wear resistance and corrosion resistance can be obtained, and the tip shape accuracy can be improved. However, in a coating die in which such a lip member made of cemented carbide is attached to the die member, fine pores remain in the sintered body, and when this sintered body is ground, there are many pinholes. Since it is seen, there is a problem in terms of surface roughness, and it cannot be used in a manufacturing process of a liquid crystal display panel that requires high-precision coating. In addition, when the lip member made of cemented carbide is joined to the die member by welding means including brazing, the wear and deformation of the joint are large due to the influence of welding defects, reduction in joint strength, etc. in the joint. Similarly, it cannot be used in a liquid crystal display panel manufacturing process that requires high accuracy.

  In order to solve the above-described problems, the applicant of the present application previously replaced the lip member made of cemented carbide with HIP (abbreviated as Hot Isostatic Pressing, called hot isostatic pressing) By forming a lip part consisting of a HIP layer in which alloy powder with good corrosion resistance and wear resistance is directly diffusion bonded to the base material of the die member, the structure of the lip part is densified and the surface roughness is highly accurate. Of die and die having a lip portion that has a sharp edge with high precision and good wear resistance and corrosion resistance. An invention relating to a manufacturing method is proposed.

  However, in the above proposed invention, in order to form the lip portion by the HIP layer, the entire die material forming the die member is placed in the processing chamber of the HIP (hot isostatic pressing) device to perform the HIP processing. In this case, in the case of a large die material, a large HIP device corresponding to the die material is required, resulting in an increase in equipment costs, and a part of the die material that needs to be HIP processed. Since the entire die material must be HIPed, it is very inefficient and results in high die product manufacturing costs.

  The present invention has been made in view of the above circumstances. A HIP bar is manufactured by forming a HIP layer on a support that forms a part of a die member, and the HIP bar is welded to the die member. It is an object of the present invention to provide a die and a method of manufacturing a die that can eliminate the need for a large HIP device and reduce the manufacturing cost of the die product.

  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 tip of the die flow path 24 formed between the plurality of die members 5 and 5. In the die having the lip portions L, L in the portion and discharging the coating liquid or molten resin supplied to the die flow path 24 from the lip portion L, the die member 5 includes the die body portion 4 and the HIP bar 3. The HIP bar 3 includes a support 2 made of the same material as or similar to the die body 4 and an HIP layer 1 in which an alloy powder having good corrosion resistance and wear resistance is directly diffusion bonded to the support 2 by HIP treatment. The support body 2 side of the HIP bar 3 is joined to the die body portion 4 by welding, and the lip portion L is formed by the HIP layer 1.

  A second aspect of the present invention is the die according to the first aspect, wherein the inner wall surface of the die member 5 forming the die flow path 24 other than the lip portion L is coated with a hard chrome plating layer 26 or an electroless nickel plating layer. It is characterized by that.

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

  According to a fourth aspect of the present invention, in the die according to any one of the first to third aspects, the support 2 of the HIP bar 3 is made of austenite / ferrite duplex stainless steel.

  The invention according to claim 5 is the die manufacturing method according to any one of claims 1 to 4, wherein the alloy powder having good corrosion resistance and wear resistance is directly diffusion bonded to the support 2 by HIP treatment. Thus, the HIP bar 3 is formed, and the die 2 is formed by joining the support 2 side of the HIP bar 3 to the die body 4 by welding. The lip portion L is formed by the HIP layer 1 of the HIP bar 3. It is characterized by forming.

  6. The method for manufacturing a die according to claim 5, wherein the inner wall surface of the die member 5 forming the die flow path 24 other than the lip portion L is coated with a hard chromium plating layer 26 or an electroless nickel plating layer. It was made to do.

  According to a seventh aspect of the present invention, in the die manufacturing method according to the sixth aspect, the support 2 side of the HIP bar 3 is joined to the die main body 4 by brazing, electron beam welding or laser beam welding. Features. Brazing is a method of joining members together without melting the base material itself by melting an alloy (wax) having a melting point lower than that of the metal member (base material) to be joined and using it as a kind of adhesive. Although it is a means for joining metals, it is a kind of welding here.

  The effect of the invention by the above solution will be described with reference numerals in the embodiments described later. According to the die of the invention according to claim 1, the die member 5 is composed of the die body portion 4 and the HIP bar 3. The HIP bar 3 includes a support 2 made of the same or similar material as that of the die body 4 and an HIP layer 1 in which an alloy powder having good corrosion resistance and wear resistance is directly diffusion bonded to the support 2 by HIP treatment. Since the support body 2 of the HIP bar 3 is joined to the die body portion 4 by welding and the lip portion L is formed by the HIP layer 1, the entire die material is formed to form the HIP layer. The HIP bar 3 to be a part of the die material is formed in advance and can be joined to the die body portion 4 by welding, so that the die member 5 can be manufactured easily and easily. The die It is possible to significantly reduce the manufacturing cost of the goods.

  According to the second aspect of the present invention, if all the die flow paths 24 formed between the die members 5 and 5 are formed by the HIP layer, the die manufacturing cost will be very high. Since the inner wall surface of the die member 5 that forms the die flow path 23 other than the portion L is coated with a hard chrome plating layer 26 or an electroless nickel plating layer that is much cheaper than the HIP process, The manufacturing cost of the die can be reduced while the friction can be reduced. Hard chrome plating has a small coefficient of friction, very good sliding, prevents other substances from adhering, and has rust-preventing power, reducing friction with molten resin and coating liquid, and reducing friction. Even when a highly melted resin or coating solution is used, the wetted part of the die channel 24 is not damaged or 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 26.

  According to the third aspect of the present invention, when the alloy powder to be subjected to HIP treatment is made of a nickel-based alloy or a cobalt-based alloy, the corrosion resistance is further improved.

  When the support 2 of the HIP bar 3 is made of austenite / ferrite duplex stainless steel as in the invention according to claim 4, the nickel alloy powder or the cobalt alloy powder used for the alloy powder of the HIP layer 1 Therefore, the bending deformation due to the difference in thermal expansion is reduced.

  According to the die manufacturing method of the invention of claim 5, the HIP bar 3 is formed by directly diffusion-bonding the alloy powder having good corrosion resistance and wear resistance to the support 2 by HIP treatment. Since the die member 5 is formed by welding the support body 2 side of the die 3 to the die body portion 4 by welding, and the lip portion L is formed by the HIP layer 1 of the HIP bar 3, the HIP layer is formed. However, it is not necessary to perform the HIP process on the entire die material, and the HIP bar 3 to be a part of the die material may be formed in advance, and this may be joined to the die main body portion 4 by welding. 5 becomes simple and easy, and the production cost of the die product can be significantly reduced.

  According to the sixth aspect of the present invention, when all the die flow paths 24 are to be formed by the HIP layer, the die manufacturing cost is very high. Since the inner wall surface of the die member 5 to be formed is coated with the hard chrome plating layer 26 or the electroless nickel plating layer that is much cheaper than the HIP treatment, the friction with the coating liquid or the molten resin can be reduced, The die manufacturing cost can be reduced.

  When the support body 2 side of the HIP bar 3 is joined to the die body portion 4 by brazing as in the invention according to claim 7, the equipment is simple and the joining work is facilitated, and the cost can be reduced. Further, in the case of electron beam welding, the penetration width is narrow and welding with a deep penetration depth can be performed, and the joint strength of the welded portion can be sufficiently increased. Further, in the case of laser beam welding, a deep penetration depth can be obtained at a high speed, the joint strength of the welded portion can be sufficiently increased, and there is little thermal influence and welding deformation is small.

(a) is a perspective view showing a HIP bar, (b) is a perspective view showing a die main body, and (c) is a perspective view of a die member in which the HIP bar is joined to the die main body. (a) is an end view of the HIP bar, (b) is an end view of the die body, and (c) is an end view of the die member. (a)-(d) is explanatory drawing explaining the manufacturing method of HIP processing. (a)-(c) is explanatory drawing which shows the process in which a coating die is manufactured with a pair of die member which joined the HIP bar to the die main-body part. 1 shows a T-die composed of a pair of die members, (a-1) is a front view showing one of the die members, (a-2) is a sectional view taken along line XX of (a-1), (b) ) Is a cross-sectional view of a T-die. It is explanatory drawing which shows embodiment in the case of coat | covering a hard chromium plating layer, and shows the first half part of the process which manufactures a coating die with a pair of die member which joined the HIP bar to the die main-body part. It is explanatory drawing which shows the latter half part of the process which manufactures the same coating die. In the case of coating a hard chrome plating layer, it shows a T die consisting of a pair of die members, (a-1) is a front view showing one of the die members, and (a-2) is (a-1) FIG. 6 is a cross-sectional view taken along line YY of FIG.

  A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a die member 5 for producing a coating die and a T die according to the present invention, and (a) is a perspective view of a HIP bar 3. FIG. 2B is a perspective view of the die main body 4, FIG. 2C is a perspective view of a die member 5 formed by joining the HIP bar 3 to the die main body 4, and FIG. FIG. 3B is an end view of the die body 4, FIG. 3C is an end view of the die member 5, and FIG. 3 is an explanatory view showing a manufacturing process of the HIP bar 3.

  The HIP bar 3 shown in FIG. 1 (a) and FIG. 2 (a) has a support 2 made of the same or similar material as that of the die body 4 and an alloy powder having good corrosion resistance and wear resistance. The support body 2 of the HIP bar 3 is engaged with an engagement step portion 4a provided on the tip end side of the die body portion 4. The die body 5 is joined to the die body 4 by welding, and the lip portion of the die member 5 is formed by the HIP layer 1 of the HIP bar 3.

  For the die body 4 of the die member 5, SUS440 (martensitic stainless steel), SCM440 (alloy steel for mechanical structure), SUS329J1 (austenite / ferrite duplex stainless steel, or the like is used.

  The manufacturing method of the HIP bar 3 will be described with reference to FIG. 3. Here, a case where a pair of HIP bars 3 and 3 are manufactured simultaneously is shown. First, as shown in FIG. In a state where the core molds 14 and 14 each coated with a heat-resistant release material are accommodated in the recess portions 13 and 13 for the alloy powder formed on the mating surfaces of the capsule materials 12 and 12, both the capsule materials 12 and 12 are stored. The capsule materials 12 and 12 that have been butted together are temporarily fixed by welding to form a capsule 15, and inside the alloy powder recesses 13 and 13 of the capsule material 12 and 12 from the powder supply port 16 of the capsule 15. 3 is filled with alloy powder 17 having good corrosion resistance and wear resistance, and the powder supply port 16 is closed with a closing plate 18 to be deaerated and sealed, and the state shown in FIG.

  In this case, the capsule material 12 will eventually become the support 2 of the HIP bar 3 and is made of the same or similar material as the material of the die body 4, such as SCM440, SUS329J1-4, SS400, S45C-S55C, etc. However, SUS329J1-4 (austenite / ferrite duplex stainless steel) is preferably used. This is because the thermal expansion coefficient is close to that of the nickel-based alloy powder or cobalt-based alloy powder used for the alloy powder of the HIP layer 1, and the bending deformation due to the thermal expansion difference is small.

  For the alloy powder 17 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. The preferred cobalt-based alloy powder has a constituent element ratio of 45.7% by weight cobalt, 19.0% by weight chromium, 15.0% by weight tungsten, 1.3% by weight copper, 13.0% by weight nickel, It is composed of 3.0% by weight of boron and 3.0% by weight of silicon.

Then, the capsules 15 are placed in the processing chamber 19 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. 3C, the HIP layers 1 and 1 in which the alloy powder is diffusion bonded to the inner wall surfaces of the capsule materials 12 and 12 are formed. The HIP layer 1 thus formed is a hard layer having a hardness of HRC57 to 68 made of a nickel-based alloy or a cobalt-based alloy having a constituent element ratio as described above.

  The capsule 15 in which the HIP layers 1 and 1 are formed on the inner wall surfaces of the capsule materials 12 and 12 by HIP processing as described above is disassembled as shown in FIG. Then, the substrate is appropriately cut and cut so as to have a required shape along the cutting / cutting line 20 indicated by a two-dot chain line in the drawing, and the support is shown in FIG. 3 (d). A pair of HIP bars 3 composed of 2 and the HIP layer 1 is formed. The support 2 of each HIP bar 3 is obtained by cutting and cutting the capsule material 12 into a required shape.

  The die member 5 is formed by joining the HIP bar 3 manufactured as described above to the die body portion 4 by welding. That is, as shown in FIGS. 1 and 2, an engagement step 4a having the same rectangular cross section as that of the HIP bar 3 is formed on the inner surface of the tip end portion of the die body 4 having a predetermined length. The support 2 side of the HIP bar 3 is brought into contact with and engaged with the stepped portion 4a so as to be in a state as shown in FIG. 1C. In this state, the support 2 side of the HIP bar 3 is placed on the die body 4 Are joined together by welding, preferably by brazing, electron beam welding or laser beam welding to form a die member 5. In general, brazing is performed by melting an alloy (wax) having a melting point lower than that of a metal member (base material) to be joined and using it as a kind of adhesive, thereby joining the members without melting the base material itself. Although it is a method, since it is a means for joining metals, it is a kind of welding here.

  When the die body portion 4 is joined to the support 2 side of the HIP bar 3 by brazing, a silver brazing mainly composed of silver, copper, and zinc is used as the brazing. In the case of this brazing, since the equipment is simple and the joining work is easy, the cost can be reduced.

  In electron beam welding, a high melting point metal such as tungsten is heated and accelerated by applying a high voltage of 50 to 100 kV to the generated thermoelectrons to collide with a welded portion. The welding is performed in a vacuum. In the case of this electron beam welding, the penetration width is narrow, welding with a deep penetration depth can be performed, and the joint strength of the welded portion can be sufficiently increased. Laser beam welding is welding performed using the energy of a laser beam, and a carbon dioxide laser or a YAG laser is used as the laser beam. This laser beam welding has advantages such as a small amount of heat input, a very high penetration depth at a high speed, a very small influence of welding heat, and a small amount of thermal deformation.

  The feature of the present invention is that, as described above, the HIP bar 3 is formed by directly diffusion-bonding the alloy powder having good corrosion resistance and wear resistance to the support 2 by HIP treatment, and the support 2 of the HIP bar 3 is formed. In forming the die member 5 by joining the side to the die body portion 4 by welding including brazing, the conventional HIP layer 1 for forming the lip portion L is formed. It is not necessary to HIP the entire die material, and the HIP bar 3 that is a part of the die material is manufactured in advance, and this HIP bar 3 can be joined to the die body 4 by welding. A small HIP apparatus can be used, and the die member 5 can be easily and easily manufactured, and the manufacturing cost of the die product can be significantly reduced.

  FIGS. 4A to 4C illustrate a case where the coating die A is manufactured by a pair of die members 5 and 5 formed by joining the HIP bar 3 to the die body portion 4 by welding. As shown in (a) of the figure, both die members 5 and 5 are cut and cut into a required shape along a cutting line 20 indicated by a two-dot chain line, and one die is also shown in (b). A coating liquid supply path 22 and a manifold 23 are formed in the member 5, and both die members 5, 5 are arranged to face each other at a predetermined interval as shown in (c). In addition to forming the die channel 24, the lip portions L, L are formed by the HIP layers 1 and 1 at the tip of the die channel 24, and thus the coating die A can be easily and easily manufactured. When the die members 5 and 5 are arranged to face each other at a predetermined interval, only the mating surfaces of the die members 5 and 5 or only the mating surfaces of the die members 5 and 5 of the lip portions L and L are used. May be mirror-ground. Thereby, it becomes possible to finish the edge part of the lip | rip parts L and L to a highly accurate sharp edge (for example, 1 micrometer unit), and generation | occurrence | production of the "debris" which arises by a slight impact can be reduced.

  FIG. 5 shows a case where a T-die B is manufactured by a pair of die members 5 and 5 formed by welding the HIP bar 3 to the die body 4 by welding (a-1) The front view which shows the die member 5, (a-2) is XX sectional drawing of (a-1), Comprising: On each die member 5, the manifold part 23a, the die flow path part 24a, An inflow port portion 25a is formed, and a pair of die members 5 and 5 are arranged to face each other at a predetermined interval as shown in FIG. A molten resin inlet 25 at the inlet of the die passage 24 and a manifold 23 at an intermediate portion thereof, and a lip portion L, HIP layers 1, 1 at the tip of the die passage 24. L can be formed, and thus the T die B can be manufactured easily and easily. Similar to the manufacture of the T-die A, when the two die members 5 and 5 are arranged to face each other at a predetermined interval, the die surfaces 5 of the die members 5 and 5 or the die members 5 of the lip portions L and L are arranged. , 5 may be mirror-polished only on the mating surfaces.

  6 and 7 show an embodiment in which the hard chrome plating layer 26 is coated on the inner wall surface of the die member 5 that forms the die flow path 24 other than the lip portion L. As described above, the HIP bar 3 6 shows a case where the coating die A according to the present invention is manufactured by a pair of die members 5 and 5 formed by welding and bonding to the die main body portion 4, and (a-1) and (a- 2) to (c-1) and (c-2) and (a-1) and (a-2) in FIG. 5 show the manufacturing process of only one of the die members 5 and 5, and FIG. (b) shows the coating die A in a completed state comprising both die members 5 and 5.

  In the production of the coating die A, first, as shown in FIGS. 6A-1 and 6A-2, the die member 5 has an inner side of the die member 5 other than the HIP layer 1 serving as the lip portion L. And the undercut for performing the hard chrome plating process which is a surface treatment is performed on the front end surface side by grinding. In FIG. 6A-2, the undercut portion is denoted by 21 and the undercut amount is denoted by w. The undercut amount w is appropriately set in consideration of the thickness of the hard chrome plating layer 26 to be performed later, and is set to 100 μm, for example. In addition, this undercut process is performed over the support body 2 and part of the HIP layer 1 of the HIP bar 3 from the die body 4 as shown in the figure.

  (B-1) and (b-2) of FIG. 6 show the state after the undercut grinding process, and the thickness of the hard chrome plating layer 26 covered by the undercut portion 21 In consideration of the grinding process, the thickness W is sufficiently thicker than the final film thickness (undercut amount w). 6 (c-1) and (c-2) show a hard chrome plating layer 26 in which the undercut portion 21 is coated with a film thickness W. FIG. In order to form the hard hard chrome plating layer 26, the electroless nickel plating process may be performed, and then the hard chrome plating process may be performed, whereby the hard chrome plating layer for the die member 5 is formed. The adhesion force of 26 is very good.

  (A-1) and (a-2) of FIG. 7 show the hard chrome plating of the die member 5 coated with a thick film thickness W as shown in (c-1) and (c-2) of FIG. A state in which the layer 26 is ground so as to be flush with the HIP layer 1 of the HIP bar 3 to be the lip portion L is shown. As shown in this embodiment, by doubling a portion of the hard chrome plating layer 26 onto the HIP layer 1 of the HIP bar 3, the HIP layer 1 portion and the hard chrome plating layer 26 (surface treatment portion) are flush with each other. In addition, the welded portion between the HIP bar 3 and the die body portion 4 does not come out on the surface, and the HIP processing portion and the surface treatment portion including the support 2 are integrated.

  As described above, the hard chrome plating layer 26 is ground to the same level as the HIP layer 1 and, if necessary, appropriately cut into a required shape and further mirror-finished (including buffing), thereby making a pair of coating dies. The die members 5 and 5 are formed, and the coating liquid supply path 22 and the manifold 23 are formed in one die member 5, and as shown in FIG. The die flow path 24 is formed between the two die members 5 and 5 by butt-joining symmetrically at intervals, and the lip portions L and L on the tip end side of the die flow path 24 are connected to both the die members 5 and 5. The coating die A is manufactured by forming the HIP layers 1 and 3 of the HIP bars 3 and 3. When the two die members 5 and 5 are butt-joined symmetrically at a predetermined interval, the mating surfaces of the die members 5 and 5 or the die members 5 and 5 of the lip portions L and L are mated. Only the surface may be mirror-polished. Thereby, it becomes possible to finish the edge part of the lip | rip parts L and L to a highly accurate sharp edge (for example, 1 micrometer unit), and generation | occurrence | production of the "debris" which arises by a slight impact can be reduced.

  FIG. 8 shows a T-die B composed of a pair of die members 5 and 5 formed by welding the HIP bar 3 to the die body portion 4 by welding as described above. The front view which shows the one die member 5, (a-2) is the YY sectional view taken on the line (a-1). On the inner surface side of each die member 5, a die flow path portion 24a, a manifold portion 23a, and an inflow port portion 27a are formed, and a lip portion L is formed by the HIP layer 1 at the tip of the die flow path portion 24a. Further, a hard chrome plating layer 26 or an electroless nickel plating layer is formed on the inner wall surface of the die member 5 that forms the die flow path 24a (including the manifold portion 23a) other than the lip portion L, and FIG. ), The die flow path 24 is formed between the die members 5 and 5, and a molten resin inlet 27 is provided at the inlet of the die flow path 24. In addition, the manifold 23 is formed in the middle portion thereof, and the lip portions L and L are formed by the HIP layers 1 and 1 at the tip end portion of the die flow path 24. Thus, the T die B can be easily and easily manufactured. Become. As in the manufacture of the T-die A, when the pair of die members 5 and 5 are arranged to face each other, the respective mating surfaces of the die members 5 and 5 or the die members 5 and 5 of the lip portions L and L Only the respective mating surfaces may be mirror-ground.

  According to the T die A and the coating die B according to the present invention described above, the die member 5 is composed of the die main body portion 4 and the HIP bar 3, and the HIP bar 3 is the same or similar material as the die main body portion 4. And a HIP layer 1 in which an alloy powder having good corrosion resistance and wear resistance is directly diffusion-bonded to the support 2 by HIP treatment, and the support 2 of the HIP bar 3 is the die body 4. Since the lip portion L is formed by the HIP layer 1 formed by welding, it is not necessary to perform the HIP process on the entire die material to form the HIP layer. 3 may be formed in advance and joined to the die body 4 by welding. Therefore, the die member 5 can be easily manufactured, and the manufacturing cost of the die product can be reduced.

  In addition, when all the die flow paths 24 formed between the die members 5 and 5 are formed by the HIP layer, the die manufacturing cost will be very high, but the die flow paths 24 other than the lip portion L are increased. Since the inner wall surface of the die member 5 that forms the surface is coated with the hard chromium plating layer 26 or the electroless nickel plating layer that is much cheaper than the HIP treatment, it is possible to reduce friction with the coating liquid or the molten resin. However, the manufacturing cost of the die can be reduced. Hard chrome plating has a small coefficient of friction, very good sliding, prevents other substances from adhering, and has rust-preventing power, reducing friction with molten resin and coating liquid, and reducing friction. Even when a highly melted resin or coating solution is used, the wetted part of the die channel 24 is not damaged or 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 26.

  Further, the lip portion L of the die member 5 is formed by the HIP layer 1 in which the alloy powder is directly diffusion bonded to the support 2 by HIP processing. Compared with the portion, the bonding strength with the base material is remarkably increased. Further, since the HIP layer 1 forming the lip L 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 1 disappears. The hard chrome plating layer 26 can be restored at low cost.

  In the above embodiment, the hard chrome plating layer 26 is coated on the inner wall surface of the die member 5 that forms the die flow path 24 other than the lip portion L. A nickel plating layer may be formed on the inner wall surface of the die member 5 that forms the die flow path 24 other than the lip portion L by nickel 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 the hard chrome plating layer 26, and also Corrosion resistance is also excellent.

  Further, the die according to the present invention (coating die A or T die B) is usually formed with an engaging step portion 4a for attaching a HIP bar on a new die main body portion 4 in the manufacturing process. The HIP bar 3 is integrally joined to the part 4a, but by attaching the HIP bar 3 to a required part of an existing die, it can be transformed (reproduced) into a die with the HIP bar 3. In that case, an engagement step for attaching the HIP bar is formed by cutting the required portion of the existing die by machining or the like, and the HIP bar is engaged with the engagement step, preferably brazing or Join by electron beam welding or laser beam welding. By transforming (reproducing) into a die having the HIP bar 3 in this way, the HIP layer 1 in millimeters can maintain high hardness even in the event of maintenance against damage or abrasion.

DESCRIPTION OF SYMBOLS 1 HIP layer 2 Support body 3 HIP bar 4 Die body part 5 Die member L Lip part 12 Capsule material 13 Recess for alloy powder 14 Core mold 15 Capsule 16 Powder supply port 17 Alloy powder 19 Processing chamber 24 of HIP apparatus Die flow path 26 Hard chrome plating layer

Claims (7)

  In a die having a lip portion at a tip portion of a die flow path formed between a plurality of die members and discharging a coating liquid or molten resin supplied to the die flow path from the lip portion, the die member is a die body The HIP bar consists of a support made of the same or similar material as the die body, and an HIP layer in which an alloy powder having good corrosion resistance and wear resistance is directly diffusion bonded to the support by HIP processing. The die in which the support side of the HIP bar is joined to the die body by welding and the lip portion is formed by the HIP layer.   The die according to claim 1, wherein a hard chromium plating layer or an electroless nickel plating layer is coated on an inner wall surface of a die member that forms a die flow path other than the lip portion.   The die according to claim 1 or 2, wherein the alloy powder to be subjected to HIP treatment is made of a nickel-based alloy or a cobalt-based alloy.   4. The die according to claim 1, wherein the support of the HIP bar is made of austenite / ferrite duplex stainless steel.   The die manufacturing method according to any one of claims 1 to 4, wherein an HIP bar is formed by directly diffusion-bonding an alloy powder having good corrosion resistance and wear resistance to a support by HIP treatment. A die manufacturing method in which a die member is formed by welding a support side of a HIP bar to a die main body portion, and the lip portion is formed by a HIP layer of the HIP bar.   The die manufacturing method according to claim 5, wherein a hard chromium plating layer or an electroless nickel plating layer is coated on an inner wall surface of a die member that forms a die flow path other than the lip portion.   The die manufacturing method according to claim 5 or 6, wherein the support body side of the HIP bar is joined to the die body portion by brazing, electron beam welding or laser beam welding.

Images