JP2005105305A - Wire for interdental brush, manufacturing method therefor and interdental brush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive wire for an interdental brush having high breaking strength and high elongation properties; a manufacturing method therefor; and an inexpensive interdental brush superior in bending strength and rigidity. <P>SOLUTION: A wire rod for the interdental brush has a chemical composition comprising, by wt.%, 0.08% or less C, 3.0-5.0% Si, 3.0% or less Mn, 4.0-12.0% Ni, 12.0-24.0% Cr, 0.9-2.0% Mo, 0.5-2.0% Cu and the balance iron with an unavoidable impurities. The method for manufacturing the wire for the interdental brush comprises final-drawing the above wire rod with a reduction of 70% or higher, and final stress-relief heat-treating it at 800-1,050°C. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an interdental brush wire suitable for cleaning an interdental portion that is difficult to clean with an ordinary toothbrush through a tooth gap (hereinafter referred to as interdental), a manufacturing method thereof, and a tooth. Between brushes.

  An interdental brush is a tool for removing plaque and food residue generated between teeth that cannot be removed with a normal toothbrush. Its general structure is as shown in FIG. That is, the interdental brush 1 is configured such that one wire 2 is folded at the tip (left end in the drawing) and a large number of bristle brushes 3 are twisted by twisting the wire 2 while the numerous bristle brushes 3 are sandwiched between the wires 2. The bristle brush 3 is firmly sandwiched in the gap between the wires 2 to form a brush part. In general, a stainless steel wire is used for the wire 2 and a resin such as nylon is used as the material of the bristle brush 3. When using an interdental brush with the above structure, insert the brush part of the interdental brush between the teeth and move it back and forth, rubbing the bristle brush between the teeth and gums, and plaque It removes food and food.

By the way, the interdental brush is manufactured by twisting so that a large number of bristle brushes are wound as described above. However, since the wire is stretched in the twisting process, the wire is required to have high stretch characteristics. Specifically, the elongation at break is required to be 25% or more.
In addition, the interdental brush is used by sliding a brush part between both sides of a tooth with a brush part interposed between narrow teeth. Moreover, it is generally used many times without being discarded in one use. For this reason, bending strain and buckling strain are repeatedly applied to the wire. Accordingly, the wire is required to have high bending strength and rigidity.
Since the bending strength and rigidity are proportional to the breaking strength of the wire, the interdental brush wire requires high breaking strength. Specifically, 1000 MPa or more is necessary.

As the interdental brush wire, stainless steel wire, in particular, SUS304 stainless steel wire of JIS standard is often used. However, the stainless steel wire used for the interdental brush has a breaking strength of at most about 800 MPa, and the bending strength and rigidity are not sufficient. As described above, the interdental brush wire is required to have a high breaking strength and a high elongation characteristic, but the breaking strength and the elongation characteristic are inversely proportional to each other in the metal wire. The reason why the breaking strength of the conventional interdental brush wire is about 800 MPa is to obtain high elongation characteristics that can withstand twisting.
As means for solving this problem, Japanese Patent Laid-Open No. 8-308637 discloses an interdental brush using a Co alloy wire to which Co (cobalt) is added in an amount of 30 to 50%, and Japanese Patent Laid-Open No. 7-227315 discloses. An interdental brush using a Co alloy in which a necessary amount of elements such as Cr, Ni, Mo, C, Mn, Si, W, Fe, and Ti is added to Co has been proposed.
JP-A-8-308637 JP 7-227315 A

The interdental brush wire using the Co alloy has a high elongation property while having a high breaking strength. However, Co is a very expensive element and has the disadvantage that the price of the interdental brush is high.
The present invention has been made in view of the above circumstances, and provides an interdental brush wire that is inexpensive, has high breaking strength, and has high elongation characteristics, as well as its manufacturing method, bending strength, and rigidity. It is an object to provide an interdental brush that is excellent and inexpensive.

  In order to solve the above-mentioned problems, the interdental brush wire of the present invention is, by weight, C: 0.08% or less, Si: 3.0 to 5.0%, Mn: 3.0% or less, Ni : 4.0 to 12.0%, Cr: 12.0 to 24.0%, Mo: 0.9 to 2.0%, Cu: 0.5 to 2.0%, the balance being iron and inevitable impurities It is characterized by comprising.

  Moreover, the manufacturing method of the wire for interdental brushes of this invention is weight%, C: 0.08% or less, Si: 3.0-5.0%, Mn: 3.0% or less, Ni: 4. 0 to 12.0%, Cr: 12.0 to 24.0%, Mo: 0.9 to 2.0%, Cu: 0.5 to 2.0%, the balance being iron and inevitable impurities A method for producing an interdental brush wire characterized by comprising: a final wire drawing process with a working degree of 70% or more; and a final strain removing heat treatment step at 800 to 1050 ° C.

Next, the reason why the chemical composition of the interdental brush wire according to the present invention is limited will be described.
C: C is not only an unnecessary element, but if its content increases and exceeds 0.08%, toughness decreases. Therefore, the C content is 0.08% or less.
Si: It is the most important element in the present invention, and the movement of Si increases the tensile strength of the material and improves the breaking strength (bending strength, rigidity) as an interdental brush wire. In order to obtain this sufficient breaking strength, a content of 3.0% or more is necessary, but if it exceeds 5.0%, the toughness is lowered and the cold workability is lowered. Therefore, the range of Si content is set to 3.0 to 5.0%.
Mn: added as a deoxidation desulfurization agent and has an effect of improving toughness. However, if it exceeds 3.0%, the cold workability is lowered. Therefore, the Mn content is 3.0% or less.
Ni: It is added for the purpose of improving the corrosion resistance, but if it is excessive, the wire drawing workability is lowered. Therefore, the range of Ni content is 4.0 to 12.0%.
Cr: Solid solution in the base improves corrosion resistance. For this reason, it is necessary to add at least 12.0% or more, but if it exceeds 24.0%, the cold workability is lowered. Therefore, the Cr content is 12.0 to 24.0%.
Mo: Strengthens the base, improves toughness and improves corrosion resistance. For this reason, 0.9% or more is necessary, but if it exceeds 2.0%, the toughness is conversely reduced. Moreover, since Mo is expensive, the cost increases. Therefore, the Mo content is set to 0.9 to 2.0%.
Cu: An element that improves corrosion resistance. For this reason, 0.5% or more is necessary, but if it exceeds 2.0%, the breaking strength decreases, and the bending strength, rigidity, and fatigue strength of the wire decrease. Therefore, the Cu content is set to 0.5 to 2.0%.

  The interdental brush wire of the present invention is characterized by adding a large amount of Si compared to conventional stainless steel (Si content of about 0.4%). However, Si increases the strength of the steel material, but if it is contained in a large amount, the crystal grains become coarse and the toughness decreases. The interdental brush wire of the present invention increases the breaking strength with a high Si content, and prevents the decrease in toughness by refining the crystal grains by adjusting the contents of Mn, Ni, and Cr. .

  The interdental brush wire of the present invention is inexpensive because no expensive element such as Co is added, and has high elongation characteristics with high breaking strength. Moreover, according to the manufacturing method of the present invention, an interdental brush wire having high breaking strength and high elongation characteristics can be easily manufactured. Therefore, the interdental brush using the interdental brush wire of the present invention is excellent in bending strength and rigidity and inexpensive.

The interdental brush wire of the present invention is manufactured by the following manufacturing process.
That is, a wire rod having a wire diameter of about 5.5 mm is manufactured with the above component composition, and solution treatment and wire drawing are repeated on the wire rod to produce an intermediate wire rod having a wire diameter of about 1.0 mm. After the solution treatment is performed, the final wire drawing is performed to a desired wire diameter (about 0.2 to 0.30 mm) at a processing degree of 70% or more. By subjecting this wire to heat treatment (strain relief annealing) at 800 to 1050 ° C., an interdental brush wire having a breaking strength of 1000 to 1300 MPa and a breaking elongation of 25 to 40% according to the present invention can be produced.

  In the above manufacturing method, the degree of work was set to 70% or more and the final heat treatment temperature was set to 800 to 1050 ° C. because the high breakage strength before heat treatment was further increased due to the high degree of work, and high elongation characteristics required for the subsequent heat treatment ( Because it was aimed at obtaining a breaking elongation), when the degree of processing is less than 70% and the heating temperature is outside the range of 800 to 1050 ° C., the optimum high strength and high elongation characteristics as an interdental brush wire cannot be obtained. is there.

  The cross-sectional shape of the interdental brush wire is preferably not only a round shape but also a flat shape such as an elliptical shape or a track shape. This is because, when the shape is flat, the ratio of the substantial cross-sectional area of the wire to the area of the circumscribed circle in the cross section of the base portion of the wire is increased, and the bending strength and rigidity are further increased.

  A 5.5 mm wire shown in Table 1 is manufactured, and solution treatment and wire drawing are repeated on this wire to produce an intermediate wire having a wire diameter of 1.0 mm, and the final solution treatment is applied to this intermediate wire. Then, the final wire drawing (working degree 94%) was performed to 0.25 mm. Next, the wire for interdental brushes was manufactured by heat-processing at 850 degreeC. Further, as a conventional example, a SUS304 wire was processed in the same manner (however, the processing conditions were suitable for SUS304).

  And the breaking strength of the obtained wire, breaking elongation, and the wire drawing workability in the middle of manufacture were compared. The results are shown in Table 2. The wire drawing workability was comprehensively judged in comparison with SUS304, such as die life, breakage, and the presence or absence of scratches. When the wire drawing workability was x, the subsequent breaking strength and breaking elongation were not investigated.

As shown in Table 2, it can be seen that the interdental brush wire of the present invention has high breaking strength and elongation characteristics.

  Next, using the materials of Example 2 shown in Table 1, the final wire drawing degree and the final strain removal heat treatment temperature were changed, and the breaking strength and breaking elongation were compared. The results are shown in Table 3.

  As shown in Table 3, it was found that the interdental brush wire manufactured within the specific range of the present invention has optimum high strength and high elongation characteristics.

  Furthermore, when the interdental brush was manufactured using the interdental brush wire of the present invention and the performance was confirmed by actually using it, it has higher performance than the conventional interdental brush using a stainless steel wire. I was able to confirm.

  Applicable to interdental brushes.

It is a schematic side view which shows the general structure of an interdental brush.

Explanation of symbols

1 Interdental brush 2 Wire 3 Bristle brush

Claims (3)

C: 0.08% or less, Si: 3.0-5.0%, Mn: 3.0% or less, Ni: 4.0-12.0%, Cr: 12.0-24. An interdental brush wire comprising 0%, Mo: 0.9 to 2.0%, Cu: 0.5 to 2.0%, and the balance consisting of iron and inevitable impurities. C: 0.08% or less, Si: 3.0-5.0%, Mn: 3.0% or less, Ni: 4.0-12.0%, Cr: 12.0-24. 0%, Mo: 0.9-2.0%, Cu: 0.5-2.0%, the balance consisting of iron and inevitable impurities, a method for producing an interdental brush wire, A method for producing an interdental brush wire, comprising: a final wire drawing process with a degree of processing of 70% or more; and a final distortion removing heat treatment step at 800 to 1050 ° C. An interdental brush using the interdental brush wire according to claim 1.

Images