JPS61272364A - Metallic mold - Google Patents

Abstract

PURPOSE:To obtain a metallic mold having high accuracy and durability by implanting Ti or N ions into the surface of a metallic mold and forming a thin TiN film on the surface of the mold. CONSTITUTION:About 10<17> Ti ions per 1cm<3> or about 5X10<17> N ions per 1cm<3> are implanted into the surface of a metallic mold such as a steel mold for molding plastics. A thin TiN film is then formed on the surface of the mold by a PVD method applicable at a low temp. such as sputtering or ion plating.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mold, and more particularly to a high-precision mold in which a thin film coating is applied after ion implantation.

(Prior Art) A wear-resistant surface treatment is applied to the surface of a mold to prevent damage due to wear. Conventionally, gas soft nitriding, ion nitriding, and C, V, D, methods have been used as methods for this anti-wear surface treatment. In these processing methods, the mold is
Since the mold is exposed to high temperatures of 00°C to 1000°C or higher, there is a major problem in that the mold undergoes dimensional changes and requires finishing. In order to avoid this problem, highly stable and hard materials such as P and V can be processed at low temperatures below 500℃.
, D. It has been proposed to coat the mold surface by the method.

(Problems to be Solved by the Invention) TiN is extremely stable compared to TIC, and is considered to be the most suitable material for protecting the mold surface. However, since TiN is extremely stable in nature, it has poor adhesion to the mold surface. If the thickness of the TiN film is 2 μm or more, the adhesion to the mold surface can be made to a level that does not pose a practical problem, but this will reduce the dimensional accuracy of the mold. Therefore, molds whose surfaces are coated with TiN are not widely used in practice.

An object of the present invention is to provide a mold with high precision and high durability.

(Means for solving the problem) After ion-implanting Ti or N into the surface of the mold, Ti
The above object is achieved by forming the N 2 N film.

Note that TiN thin films can be formed using low-temperature processes such as sputtering and ion blating for P, ■, and D.

It is done by law.

According to the present invention, it is possible to apply a thin TiN film to the mold surface.

Hereinafter, the present invention will be explained in detail with reference to Examples.

Tbi ions or N+ ions are applied to plastic molding steel materials, metal molding steel materials, and carbon steel materials for machine structures at an accelerating voltage of 70 to 150 kcV and a beam current density of 1 to 10 μΔ/
cl, ion implantation in the range of 5X10" to 1X10" ions/cId, followed by P, V, D.

The surface hardness, abrasion resistance, and adhesion of a TiN thin film formed by the P, V, and D methods were compared with those of a TiN thin film formed by the P, V, and D methods in the same manner, except that no Tbi ions or N+ ions were implanted. A comparative study was conducted.

Figure 1 shows steel materials for plastic molding (JIS).

5KD61 equivalent), Ti+ ions at 10" ions/ctl or N+ ions at 5X10" ions/ctl.
d represents the relationship between TiN film thickness and hardness of steel that was implanted and then subjected to TiN ion blating. Hardness was expressed as a relative ratio to unpoured and uncoated steel.

A clear increase in hardness was observed in steel materials subjected to ion implantation prior to TiN ion blasting compared to steel materials subjected only to TiN ion blasting without ion implantation.

Figure 2 shows steel materials for plastic molding (JIS, 5KD6
101 ions/c
This shows the relationship between TiN film thickness and wear amount when 5X10" ions/crl of rj or N+ ions are implanted and then TiN ion blating is performed. The wear test was performed using p
Using an in-disc type abrasion tester, the amount of wear was expressed as a ratio to the amount of wear of uninjected and uncoated steel. Steel that was only subjected to TiN ion blating without ion implantation exhibited wear resistance with a TiN film thickness of 1.8 μm or more, whereas steel that was ion implanted before TiN ion brating showed N+ ion 1.2 μm for injected steel,
Ti + ion-implanted steel exhibited wear resistance with a film thickness of 0.7 μm. After performing ion implantation in this way, TiN
By applying ion blating, the film thickness that is effective for wear resistance can be greatly reduced, and dimensional changes can be reduced accordingly. The above wear test had a test load of 2.11 kgf,
The test was conducted at a friction speed of 220/5eC1 and a friction distance of 1111100 m in the atmosphere without lubrication.

Figure 3 shows TiN after injecting 5×10” Ti” ions/cut into steel material for plastic molding.
The relationship between film thickness and adhesion is shown for steel subjected to ion blasting (corresponding to SKD61) and steel to which only TiN ion blasting was performed without ion implantation (corresponding to SKD61). If TiN ion blating is performed after Ti+ ion implantation, Ti+
It clearly showed stable and high adhesion compared to the case where only TiN ion blating was performed without ion implantation.

In addition, other steel materials for plastic molding, steel materials for metal molding,
Similar experiments were conducted on carbon steel materials for machine structures and stainless steel materials, but steel materials for plastic molding (SKD
The results were similar to those of the case (equivalent to 61).

(Effects of the Invention) In the mold of the present invention, the TiN thin film, which has excellent wear resistance and corrosion resistance and has high hardness, firmly adheres to the mold surface, and it is possible to make the TiN thin film thinner. This makes it possible to obtain molds with high precision and high durability. In addition,
The ion implantation of Ti or N increases the hardness of the base material, and there is also the advantage that the apparent hardness of the film is higher than that of a film formed only by the conventional P, V, D, method.

[Brief explanation of the drawing]

Figure 1 shows steel materials subjected to TiN ion blating coating after implantation of T bio-ion, 10" ion/crl or N-ion 5XIO1ff ion/Cl11 as determined by the Knoop hardness test, and steel materials subjected to TiN ion blating only with ion implantation. TiN film thickness of treated steel material and uninjected
A graph showing an example of the relationship between the hardness of uncoated steel and the relative change in hardness.
Ion 10' Fio7/cut or N'ion 5X 10' ion/cr
A graph showing an example of the relationship between the relative wear amount between the N film thickness and the wear amount of uninjected/uncoated steel material.
01a ion/cd steel with TiN ion blating coating after oil injection and T without ion injection.
It is a graph showing an example of the relationship between film thickness and adhesion force (critical shear force) in a steel material subjected to only iN ion blating. Figure 1 Lower iN 71 odor thickness [μm] Figure 2 Ti, N film thickness [埒]

Claims (1)

[Claims] TiN on the mold surface into which Ti or N atoms have been ion-implanted.
A mold with a thin film.