JP3408159B2 - Titanium clad steel blade material - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a titanium clad steel blade material , and more particularly, to a case where a quenching and hardening treatment for improving the hardness of a cutting blade portion of a blade is performed. Also, the present invention relates to a titanium clad steel blade material which does not cause a decrease in bonding strength and does not cause melting separation at a clad boundary, and has a good appearance of a clad boundary exposed at a blade cutting edge. 2. Description of the Related Art At present, as a cutting tool for maintaining a sharpness and reducing the weight and improving corrosion resistance, a cutting blade portion made of stainless steel cutting steel is partially made of a skin material made of pure titanium or a titanium alloy. A covered clad knife has been proposed (Japanese Utility Model Laid-Open No. 5-44056). If the blade other than the cutting edge is made of titanium material, which is excellent in light weight and corrosion resistance, not only can the weight of the whole blade be reduced and the corrosion resistance improved, but also the unique fertility caused by food contamination of iron-based ions can be reduced. It is possible to provide a high quality knife which is easy to use. [0003] However, the titanium clad cutting tool described in Japanese Utility Model Laid-Open No. 5-44056 is manufactured by using a normal titanium clad steel plate in which stainless steel and a titanium alloy are simply directly clad and bonded. In fact, this titanium clad blade has an insufficient bonding strength between the cutting blade portion and the outer skin portion of the blade, so that there is a problem particularly in terms of durability. [0004] That is, there is no problem when a normal titanium clad steel sheet is used as a building material. However, when the titanium clad steel sheet is used as a material for manufacturing a blade, the titanium clad steel has a high temperature. about
Various heat treatments such as quenching and hardening at 1050 ° C to 1070 ° C and cold rolling must be performed, and such heat history adversely affects the quality of the blade as a tool at the clad boundary between stainless steel and titanium alloy. The subsequent carbides and intermetallic compounds were inevitably generated, resulting in a decrease in the quality of the blade. [0005] Specifically, as a result of the heat history of the quench hardening treatment, titanium carbide is generated at the cladding boundary, so that stainless steel is decarburized, and the quench hardening of the stainless steel is hindered, and the intended cutting edge Hardness is no longer obtained, and furthermore, at this cladding boundary, titanium and iron react to generate a low-melting intermetallic compound, and as a result, a large amount of hard and brittle intermetallic compound is generated during heat treatment. As a result, a situation in which the clad boundary is easily peeled off occurs. That is, the above-mentioned Japanese Utility Model Application Laid-Open No. 5-44056 discloses that the outer shell of the blade is made of a titanium material. However, no specific means for realizing this is disclosed. It was. SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional titanium clad blade, and has been developed in consideration of the temperature of stainless steel blade steel.
It is an object of the present invention to provide a titanium clad steel blade material that does not cause a decrease in bonding strength or melting and delamination at a clad boundary when subjected to various heat treatments such as quenching and hardening at 1050 ° C to 1070 ° C. It is. Another technical object of the present invention is to provide a titanium clad steel blade material which is excellent in light weight and corrosion resistance, has excellent durability, and has a good appearance of a clad boundary which can be exposed on a cutting edge. To provide. [0009] In order to solve the above-mentioned technical problems, the present invention provides a blade steel material made of stainless steel blade steel.
A titanium clad steel blade material in which (2) is a cutting blade portion (A) of a blade and a titanium base material (1) made of pure titanium or a titanium alloy is a shell material (B) of the blade, wherein the titanium base material is
(1) and between the blade steel (2), layer thickness 5 made of titanium base material (1) side niobium layer (3) and the blade steel (2) side of the nickel layer (4)
By adopting the means of forming an intermediate layer (3, 4) of ~ 10 microns, the titanium clad steel blade material undergoes a quenching and hardening treatment at a temperature of 1050 ° C to 1070 ° C. Thus, a blade material of titanium-clad steel that can prevent diffusion and does not cause a decrease in bonding strength and no melting and peeling has been realized. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on embodiments shown in the accompanying drawings. 1 to 3 are schematic cross-sectional views showing a manufacturing process of a titanium clad steel blade material for a blade according to the present embodiment, and FIG. 4 are schematic cross-sectional views showing a manufacturing process of the titanium clad steel blade material of the present embodiment. 5 is a partial perspective view of the titanium clad steel blade of the present embodiment. In FIG. 1, what is indicated by reference numeral 1 is
This is a titanium base plate made of pure titanium material (1st class) of mm × 173mm × 223mm in length.
12mm x 115mm wide x 155mm long cutlery stainless steel (carbon
0.8%, silicon 0.5% or less, manganese 0.3% or less, phosphorus 0.
03% or less, sulfur 0.03% or less, chromium 14%, molybdenum 0.
(3%, iron remainder), and the one indicated by reference numeral 3 is 0.2 mm thick x 120 mm wide to form a niobium layer.
A niobium foil having a length of 160 mm and indicated by reference numeral 4 is a nickel foil having a thickness of 0.1 mm, a width of 120 mm and a length of 160 mm on which a nickel layer is to be formed. First, the above-mentioned materials are superimposed on a titanium base material plate 1, a niobium foil 3, a nickel foil 4, a blade steel plate 2, a nickel foil 4, a niobium foil 3, and a titanium base material 1 in this order from the top. The surfaces are cleaned and stacked, and the auxiliary members 10 and 10 of the same quality as the titanium base material plate 1 are fitted to the side surfaces of the laminate, and the joint between the auxiliary material 10 and the titanium base material 1 is formed over the entire circumference. By applying TIG welding 5, the superposed surface of each material is sealed off from the outside air (see FIG. 2). Next, this sealed laminate is hot-rolled at about 850 ° C. to obtain a thickness of 4 mm × a width of 173 mm × a total length of about 4 mm.
Form a 2800mm titanium clad steel sheet. Thereafter, intermediate annealing (temperature about 800 ° C., time 5 minutes) and cold finish rolling are performed to obtain a titanium-clad steel sheet having a thickness of 2 mm (see FIG. 3). A knife-shaped blade mold is punched from the titanium clad steel sheet thus obtained, and the blade body is quenched and hardened (at a temperature of about 1050 ° C. to 1070 ° C. for 5 minutes).
By performing a grinding process (see FIG. 4) and attaching a handle C to the blade base, a blade is constituted by a cutting blade portion A formed of the blade steel material 2 and a skin portion B formed of the titanium base material 1. The knife (knife) thus formed is formed (see FIG. 5). [0015] The titanium clad steel blade material of the present embodiment is:
Thus, the niobium layer 3 is located between the titanium base material 1 and the blade steel material 2.
And the nickel layer 4 are interposed, so that the blade steel 2 has a bad influence on the quality of the blade at the cladding boundary even after undergoing a heat history of quenching and hardening at a temperature of about 1050 ° C. to 1070 ° C. for the stainless steel blade steel. No secondary reactant is produced, and a high quality titanium clad steel blade material can be manufactured. That is, in the titanium clad steel blade of the present embodiment, since the nickel layer 4 is interposed on the side of the blade steel material 2, the diffusion of carbon in the blade steel material 2 even after the heat history during the quenching and hardening treatment. It is possible to prevent decarburization of the blade steel material 2 which hinders quenching and hardening. Moreover, since the iron-nickel alloy generated at the boundary between the blade steel material 2 and the nickel layer 4 has excellent ductility, the iron-nickel alloy does not break at the cladding boundary during cold rolling. Carbon diffusion of the blade steel material 2 can be reliably prevented without leakage. In addition, since the melting point of the iron-nickel alloy is 1450 ° C. or more, there is no adverse effect that the clad boundary is peeled off during the quenching and hardening treatment at about 1050 ° C. to 1070 ° C. The present inventor conducted a test using a copper alloy layer instead of the nickel layer 4 and an ultra-low carbon stainless steel foil instead of the niobium layer 3. As a result, the stainless steel foil was frequently constricted or broken, and the titanium base material 1 and the copper alloy layer were partially in contact with each other. This contact portion was melted by the heat history of the quench hardening treatment, and as a result, carbon diffusion and decarburization of the blade steel material 2 were remarkable, and it was found that the blade steel material 2 could not be used as a clad steel material for cutting tools. As described above, the diffusion of carbon during the quenching and hardening treatment can be reliably prevented by the interposition of the nickel layer 4. However, when the nickel layer 4 reacts with the titanium of the titanium base material 1, about 1050 ° C. to 1070 ° C. This results in the formation of a titanium-nickel alloy having a melting point (about 955 ° C.) lower than the quenching and hardening treatment temperature of 0 ° C., which causes melt exfoliation during this quench hardening treatment. Therefore, in the present invention, the niobium layer 3 is interposed on the titanium base material 1 side. The use of the niobium layer 3 suppresses the generation of a reactant that adversely affects the quality of the blade with the nickel layer 4, and at the same time,
The formation of a reactant that causes quality degradation is suppressed even with the titanium base material 1. That is, the niobium layer 3 reacts with the nickel layer 4 due to the heat history during the quench hardening treatment to form a niobium-nickel intermetallic compound. The alloy is excellent in extensibility. No adverse effects such as breaking at the cladding boundary during cold rolling, and the melting point is about 12
It is 70 ° C or higher, which is higher than the quench hardening temperature, and does not melt during the quench hardening process. Moreover, since niobium is a metal that is very familiar with titanium of the titanium base material 1, a solid solution is formed between the two. The niobium-titanium alloy formed between the niobium layer 3 and the titanium base material 1 also has excellent ductility, does not break during cold rolling, and has a high melting point of about 1660 ° C. or more. Therefore, it does not peel off during quenching and hardening. When only the niobium layer 3 is interposed between the titanium base material 1 and the blade steel material 2, the niobium of the niobium layer 3 reacts with the carbon of the blade steel material 2.
The decarburization phenomenon of the blade steel material 2 occurs, and quench hardening is hindered. On the other hand, in the present invention, the niobium layer 3 could be adopted because the nickel layer 4 was interposed on the blade steel material 2 side. When a test was conducted by forming a tantalum layer in place of the niobium layer 3, the tantalum alloy layer broke off at the clad boundary during cold rolling, and broke off during quench hardening. The carbon diffusion phenomenon occurs in the part,
It turned out that it could not be used as a clad steel material for cutting tools. When a molybdenum layer was formed instead of the niobium layer 3 and a test was conducted, it was found that
It was also found that the molybdenum alloy layer was broken during cold rolling, and a carbon diffusion phenomenon occurred in the broken part during the quenching and hardening treatment, making it unusable as a clad steel material for cutting tools. As described above, the present invention not only prevents the diffusion of carbon in the blade steel 2 due to the heat history of the quench hardening treatment, but also comprehensively considers the melting point temperature and spreadability of the compound formed between the materials. Has been developed. Since the ductility of the resulting compound during cold rolling is also taken into consideration, the niobium and nickel materials interposed between the titanium base material 1 and the blade steel material 2 are as described above.
Even urchin thin electroformed layer, it as thousand off during cold rolling without, it can be reliably prevented formation of compound that results in a decrease in tool quality. Therefore, as shown in FIGS. 4 and 5,
The apparent thickness T of the intermediate layer of niobium and nickel, which appears at the cladding boundary between the cutting edge portion A and the outer skin portion B of the titanium clad steel blade material, is also extremely thin, and this intermediate layer is formed of the blade. It doesn't hurt the appearance.
That is, this titanium clad steel blade is excellent in lightness and corrosion resistance, and also has high durability, and the cutting edge portion A has a good appearance. In FIGS. 4 and 5,
Although the apparent thickness T of the intervening intermediate layer is exaggeratedly illustrated,
As shown in the right side drawing in FIG. 4 and FIG.
Cutting edge A and outer skin exposed on the slope of the object
Niobium and nickel appear at the cladding boundary between part B
The apparent thickness of the intervening intermediate layer in Le T (= the slope of the intervening intermediate layer
Width) is about 50-100 microns, and the true thickness or layer thickness is about 5-
10 microns. The embodiment, which is a specific example of the present invention, is generally configured as described above. However, the present invention is not limited to this embodiment, and various modifications may be made within the scope of the claims. Is possible. For example, in the above embodiment, the titanium base material 1
Although a pure titanium material (a first type) is used as a material of course, the present invention is not limited to this, and a titanium alloy of aluminum 6% -vanadium 4% -remaining titanium may be used. Further, the blade steel material 2 is not limited to the above embodiment, but is 0.9% carbon-0.5% silicon or less-0.3% or less manganese-0.03% or less phosphorus-0.03% or less sulfur-15% chromium-0.3% molybdenum- Stainless steel with the remaining iron may be used. As described above with reference to the embodiments , in the titanium clad steel blade material of the present invention, a niobium layer and a blade steel material are provided between the titanium base material and the blade steel material on the titanium base material side. Since the nickel layer is interposed on the side, when quenching and hardening treatment at a temperature of about 1050 ° C to 1070 ° C is performed to improve the hardness of the cutting blade part of the blade, lowering of bonding strength and melting High quality titanium clad steel blades can be provided to the market without any problems. In the titanium clad steel blade material of the present invention , a skin material formed of a titanium material is clad-joined to a cutting blade portion formed of stainless steel blade steel via an intermediate layer of niobium and nickel. While maintaining the same sharpness, it is excellent in lightness and corrosion resistance as well as in durability, and since the intermediate layer of niobium and nickel is extremely thin, this intermediate layer enhances the appearance of the cutting edge. Without damaging it, a high quality titanium clad steel cutting tool can be actually provided on the market.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic sectional view showing a manufacturing process of a titanium clad steel blade material of the present embodiment. FIG. 2 is a schematic sectional view showing a manufacturing process of the titanium clad steel blade material of the present embodiment. FIG. 3 is a schematic cross-sectional view showing a manufacturing process of the titanium clad steel blade material of the present embodiment. FIG. 4 is a schematic cross-sectional view showing a manufacturing process of the titanium clad steel blade material of the present embodiment. FIG. 5 is a partial perspective view of the titanium clad steel blade of the present embodiment. [Description of Signs] 1 Titanium base material (plate) 2 Blade steel material (plate) 3 Niobium layer 4 Nickel layer A Cutting edge B Outer skin

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B26B 1/00-9/00 B26B 11/00-29/04 C21D 1 / 18,9 / 18 B23K 20 / 00

Claims (1)

(57) [Claims] [Claim 1] A blade steel material (2) made of stainless steel blade steel is used as a cutting blade portion (A) of a blade, and a titanium base material (1) made of pure titanium or a titanium alloy is used as a blade. A titanium clad steel blade material used as an outer skin material (B) of the above, wherein a niobium layer (3) on the titanium base material (1) side and a blade are provided between the titanium base material (1) and the blade steel material (2). steel (2) side of the nickel layer (4) the layer thickness 5-10 microns intervening intermediate layer consisting of (3-4) titanium clad steel blade member, characterized in that interposed therebetween.