JPH05124035A - Die surface treatment method and die - Google Patents

Abstract

(57) [Summary] [Object] The present invention relates to a die surface treatment and a die, and in particular, a die surface hardened portion is formed by hot isostatic pressing (HIP method) to improve abrasion resistance during resin cutting. It is characterized in that [Structure] The die surface treatment and die according to the present invention are
The die base material (2) is filled with a powder alloy of a component forming a hardened layer in the recess (2A) formed on the surface (2a), and the powder alloy is pressure-sintered by hot isostatic pressing. Die surface hardening part
A resin passage nozzle (1) penetrating (3) is formed in the die base material (2).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a die surface treatment method and a die, and more particularly, to a die surface hardened portion formed by hot isostatic pressing (HIP method) to obtain abrasion resistance and erosion resistance at the time of resin cutting. The present invention relates to a new improvement for improving the property.

[0002]

2. Description of the Related Art There are various dies of this type that have been conventionally used, and a typical one of them is shown in FIGS. 8 to 11. That is, first, in the case of the structure shown in FIG. 8, the surface 2a of the die base material 2 having the plurality of resin passage nozzles 1 is obtained by spraying a wear-resistant tungsten carbide-based self-fluxing alloy having a thickness t. The die surface hardened part 3 is formed. The die surface hardening portion 3 is formed with a discharge port 1a communicating with each of the resin passage nozzles 1.

Further, in the case of another structure shown in FIG. 9, a recess 2b having a depth t communicating with the resin passage nozzle 1 is formed on the surface 2a of the die base material 2 and formed in advance in each recess 2b. A die surface hardened portion 3 made of a ring-shaped cemented metal is provided and fixed by adhesion by brazing.

Further, in the case of another structure shown in FIG. 10, a die surface hardened portion 3 made of a titanium carbide sintered plate having a thickness t is formed on the surface 2a of the die base material 2, and the die surface hardened portion 3 is formed. A discharge port 1a communicating with each resin passage nozzle 1 is formed therein.

As shown in FIG. 11, each die 10 having the construction shown in FIGS. 8 to 10 is provided with a resin cutting knife 13 rotatably fixed to a rotary shaft 11 through a mounting screw 12. With the resin cutting knife 13 in contact with the surface of the discharge port 1a of each resin passage nozzle 1 of the die 10, the resin (not shown) discharged from the discharge port 1a is made into a minute pellet. You are disconnected.

[0006]

Since the conventional resin cutting and granulating die has the above-mentioned structure, the following problems exist. That is, in the case of a structure in which the self-fluxing alloy is sprayed, the thickness t of the die surface hardened portion is 0.5 to
Only about 2 mm can be made, about 1 year (up to 8000 hours)
It had reached the end of its useful life. Further, in the case of brazing and bonding the cemented carbide tip, the cemented carbide tip was dropped during operation. Further, it is technically extremely difficult to fix the cemented carbide tip and the titanium carbide, and the processing cost is also high. Furthermore, in the case of forming a die surface hardened portion for a large area such as the entire surface of the die, any of the above-mentioned conventional methods is difficult,
It was impossible to put it into practical use.

The present invention has been made to solve the above problems, and in particular, hot isostatic pressing (HIP).
Method) to form a hardened portion of the die surface to improve the abrasion resistance and erosion resistance when cutting the resin, and to provide a die surface treatment method and a die.

[0008]

A die surface treatment method and a die according to the present invention include a powder metal alloy as a component for forming a hardened layer in a recess formed on the surface of a die base material, and hot isostatic pressing. In this method, the powder alloy is pressure-sintered by pressure to form a die surface hardened portion, and a resin passage nozzle penetrating the die surface hardened portion is formed in the die base material.

More specifically, it is a method of forming a plurality of the resin passage nozzles in the die surface hardened portion.

More specifically, it is a method of forming one resin passage nozzle in the die surface hardened portion.

More specifically, a cover body is bonded to the surface of the die base material loaded with the powder alloy, a vacuum is drawn from an exhaust hole formed in the cover body, and then the hot hydrostatic pressure is applied. It is a method of forming the die surface hardened portion by pressure.

More specifically, in a die having a plurality of resin passage nozzles, a die surface hardened portion formed by hot isostatic pressing is provided in the vicinity of the discharge port of the resin passage nozzle.

More specifically, the die surface hardened portion is formed in a concave portion formed around the discharge port.

[0014]

In the die surface treatment method and die according to the present invention, the powder alloy is filled in the recess formed on the surface of the die base material, and the powder alloy is pressed by hot isostatic pressing (HIP method). Since the die surface hardened portion is formed by sintering, the die surface hardened portion is diffusion-bonded to the die base material by pressure sintering and integrally joined. Therefore, the die surface hardened portion can be extremely strongly bonded to the die base material and have sufficient abrasion resistance, peeling resistance and erosion resistance against long-term resin cutting.

[0015]

The preferred embodiments of the die surface treatment method and die according to the present invention will be described in detail below with reference to the drawings. It should be noted that the same or equivalent parts as those of the conventional example will be described by attaching the same reference numerals. 1 to 7 show a surface treatment method and a die according to the present invention, FIGS. 1 to 3 are configuration diagrams showing a step of forming a die, and FIGS. 4 to 6 show other steps. Configuration diagram, FIG. 7 is a configuration diagram showing another process.

First, in the case of the first embodiment shown in FIGS. 1 to 3, a concave portion 2A having a thickness t is formed on the surface 2a of a die base material 2 having a ring shape, and the die mother material is formed corresponding to the concave portion 2A. A plurality of resin passage nozzles 1 are formed from the back surface 2b side of the material 2. The resin passage nozzle 1 has a surface 2a in the state of FIG.
It is in a state where it is not formed up to the side and is interrupted at an intermediate stage. The thickness t is set to the thickness of the die surface hardened portion 3 to be described later at the time of finishing, and the shrinkage allowance at the time of HIP processing is 20 to 30.
% And the machining allowance is set, and it is set at about 15-25m.
It is possible up to m.

In the above-mentioned state, wear resistance of any one of nickel-based powder alloy, tungsten carbide-based powder alloy, titanium carbide-based powder alloy, etc. in the recess 2A,
The die surface hardened portion 3 is formed by filling powder alloys of components that form various hardened layers having corrosion resistance and pressure-sintering by known hot isostatic pressing (HIP method). The powder metal can be filled by a thermal spraying method.

Thereafter, as shown in FIG. 2, by continuing the processing of the resin passage nozzles 1 and penetrating the die surface hardening portion 3 to form the discharge portion 1a, each resin passage nozzle 1 is made into a die mother. Material 2 in the axial direction (that is, in the thickness direction)
Penetrates into. Therefore, a plurality of ejection openings 1a are formed in each of the die surface hardened portions 3 formed on the surface 2a.

The above-mentioned hot isostatic pressing (HIP method)
The following is an example of the experimental example by the.
As a powder alloy, nickel alloy system (Cr 14.5ω%, B
3ω%, Si4ω%, C0.65ω%, Ni about 78ω
%), And 1000 atoms in an argon gas atmosphere, 2
After the temperature is raised to 950 to 1000 ° C. in 3 hours, the temperature is continued for 2 hours, and then the natural cooling and the pressure are naturally decreased in proportion to the temperature.

Next, in the case of the second embodiment shown in FIGS. 4 to 6, a plurality of recesses 2A are formed in the die base material 2 and the die surface hardened portion 3 is formed in the same manner as described above. After that, when each resin passage nozzle 1 is continuously processed as shown in FIG. 5 to form the discharge port 1a, a die 10 having a plurality of resin passage nozzles 1 can be obtained. Therefore, in the case of the second embodiment, as shown in FIG. 6, one die surface hardening portion 3 is formed for each resin passage nozzle 1, and the same portions as those of the first embodiment are the same. The reference numerals are given and the description thereof is omitted.

When the die surface hardened portion 3 is formed on the die base material 2, as shown in FIG. 7, after each recess 2A is filled with the powder alloy, the exhaust hole 30 is formed on the surface 2a.
After the disc-shaped cover body 31 having the above is joined and the cover body 31 and the die base material 2 are integrally joined by the welded portion 32, the exhaust is carried out from the exhaust hole 30 through the vacuum pump 33. The die surface hardened part 3 is formed by hot isostatic pressing (HIP method). The cover body pull is removed after the hot isostatic pressing (HIP method) is completed.

The die 10 described above is used in combination with the cutter shown in FIG. 11, and the shape of each recess 2A is not limited to the round shape and the rectangular shape, but may be any shape. it can.

[0023]

Since the die surface treatment method and die according to the present invention are configured as described above, the following effects can be obtained. That is, since the powder alloy is filled in the concave portion formed on the surface of the die base material and pressure-sintered by the HIP method, the formed die surface hardened portion and the die base material are firmly bonded by diffusion bonding. Integrated,
Due to the strong adhesion, high reliability can be obtained without cracking or peeling during long-term operation. Further, because of the treatment by the HIP method, the thickness of the die surface hardened portion can be set to a maximum of 10 to 15 mm.
It can be extended several times to ten times that of the conventional configuration. Further, since the HIP method is used, it is possible to form the entire surface at the same time for all the nozzles, and it is possible to achieve the formation having a uniform surface.

[Brief description of drawings]

FIG. 1 is a sectional view showing an initial state of a die surface treatment method according to the present invention.

2 is a cross-sectional view taken along the line AA of FIG. 3 showing a state in which a die surface hardened portion and a resin passage nozzle are formed.

FIG. 3 is a plan view of FIG.

FIG. 4 is a sectional view showing another embodiment of FIG.

5 is a cross-sectional view taken along the line BB of FIG.

FIG. 6 is a plan view of FIG.

FIG. 7 is a cross-sectional view showing another embodiment of the pretreatment process.

FIG. 8 is a cross-sectional view of an essential part showing a die formed by a conventional method.

9 is a cross-sectional view showing another conventional example of FIG.

10 is a cross-sectional view showing another conventional example of FIG.

FIG. 11 is a cross-sectional view showing a resin granulation device.

[Explanation of symbols]

 1 Resin Passing Nozzle 2 Die Base Material 2a Surface 2A Recess 3 Die Surface Hardened Part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tetsuo Makita 1-6-1, Funakoshi Minami, Aki-ku, Hiroshima City, Hiroshima Prefecture Japan Steel Works, Ltd. (72) Minoru Yoshida 1-chome, Funakoshi Minami, Aki-ku, Hiroshima City, Hiroshima Prefecture No. 6 No. 1 within Japan Steel Works, Ltd.

Claims (6)

[Claims] 1. A die base material (2) is filled with a powder alloy of a component forming a hardened layer in a recess (2A) formed on a surface (2a) of the die base material, and the powder alloy is heated by hot isostatic pressing. Pressure sinter to form the die surface hardened part (3), and the die surface hardened part
The resin passage nozzle (1) penetrating through (3), the die base material (2)
A surface treatment method for dies, which comprises: 2. The die surface treatment method according to claim 1, wherein a plurality of the resin passage nozzles (1) are formed in the die surface hardened portion (3). 3. The die surface treatment method according to claim 1, wherein one resin passage nozzle (1) is formed in the die surface hardened portion (3). 4. The die base material loaded with the powder alloy.
The cover body (31) is joined to the surface (2a) of (2), and after evacuation is performed from the exhaust hole (30) formed in the cover body (31), the hot isostatic press is used to Die surface hardening part
The die surface treatment method according to claim 1, wherein (3) is formed. 5. A die base material (2) having a plurality of resin passage nozzles (1), the discharge port (1) of the resin passage nozzle (1).
A die having a die surface hardened portion (3) formed by hot isostatic pressing in the vicinity of a). 6. The die according to claim 5, wherein the die surface hardened portion (3) is formed in a concave portion (2A) formed around the discharge port (1a). ..