JP4691707B2 - Manufacturing method of coating muffler and manufacturing method of coating muffler tail - Google Patents

Description

  The present invention relates to a technique for gradation-coloring a surface of a stainless muffler and a muffler tail constituting exhaust parts of an automobile or a motorcycle in a stepwise color tone.

A stainless steel sport muffler for commercial automobiles and motorcycles tends to require strong design as an appearance part in addition to the purpose of silencing.
As the background, there is a muffler that is a rainbow-colored muffler for racing specifications of automobiles and the like. In other words, these race-specific mufflers use titanium as a material for corrosion resistance and weight reduction, and as a result of this titanium being oxidized by the exhaust heat of the engine, the rainbow color, that is, the metal background color Gradient colors are developed in stepwise colors that reach deep blue. This iridescent color development is due to the fact that the titanium oxide film has a large refractive index of light and the incident light and the reflected light interfere with each other. Many enthusiasts such as ordinary automobiles are feeling the sportiness peculiar to the race specifications in the tone color of this titanium-specific muffler and its tail part.

  Inexpensive and easy-to-process stainless steel itself can be colored by methods such as painting and oxidative coloring, but by any method, the above-mentioned titanium-like color development (gradual color tone from metal background to deep blue) It did not become. Therefore, in order to realize the color that makes you feel the sportiness unique to the race specifications, you can use expensive materials such as titanium and Inconel material as the material of the muffler itself, or titanium material only in the tail part of the stainless muffler, Or there was only the method of using Inconel material.

  However, titanium mufflers, which have a price difference of about 10 times compared to stainless steel, are expensive and can only meet the demands of some consumers. Further, when a titanium material is used only for the tail portion of a stainless muffler, it is difficult to weld the two, so only mechanical joining such as rivets and screws can be performed, and the aesthetics are inferior compared to welding. On the other hand, when Inconel material is used only for the tail part of a stainless steel muffler, both can be welded, but Inconel is more expensive than titanium, and some uses are in demand from customers in terms of price. It is difficult to meet satisfaction.

  In order to meet the above demand, a titanium coating muffler in which the surface color of the muffler is colored into a plurality of colors is known (see Patent Document 1). This muffler is based on a technology that makes the thickness of the titanium oxide film different by controlling the film thickness, and the muffler surface is colored from gold to red, purple, purple, blue purple, yellowish green, etc. depending on the thickness from the root of the engine to the tip. It is.

Specifically, the titanium coating layer according to the technique described in Patent Document 1 is formed of a titanium metal film and a titanium oxide film. First, a titanium metal film is vapor-deposited on a muffler material by vapor phase growth, and as a further process, the muffler subjected to the vapor deposition treatment is controlled in a baking furnace under a predetermined heating temperature and a predetermined baking time. A titanium oxide film having a different thickness with respect to the length direction of the muffler is formed thereon.
Utility Model Registration No. 3088978

  Since the titanium coating layer according to Document 1 requires a step of forming a titanium oxide film for color development separately from the step of forming the titanium metal film, the manufacturing process of the entire muffler is complicated. In addition, as is clear from FIG. 2 described in the above-mentioned document 1, although the colors are colored as gold, magenta, purple, blue-violet, and yellowish green, each color according to the titanium metal film thickness is independent. The above-mentioned sporty characteristics unique to the race specifications, that is, the color of the natural gradation ranging from “silver” metal background color to the unique deep blue color of titanium cannot be equated, and further improvement has been awaited.

  Therefore, the present invention does not go through a separate coating process for color development such as the above-described film thickness control, and oxidizes the titanium coating itself, so that the “silver” metal background color leads to a deep blue color unique to titanium. It is an object of the present invention to provide a coating muffler and a coating muffler tail colored in rainbow colors that exhibit natural gradation.

In order to solve the above problems, the present invention has the following configuration. That is, the manufacturing method of the coating muffler according to claim 1 is a method of forming a film made of one of titanium or inconel on the surface of the substrate in a muffler based on stainless steel; While rotating the shaft at a speed of 15 to 20 mm / sec, only the end portion of the muffler is heated with a gas burner internal flame for a predetermined time , and the portion not exposed to the burner flame is heated only by heat conduction. It is characterized by that.

The method of manufacturing a coating muffler tail according to claim 2 further comprises the step of forming a film made of one of titanium or inconel on the surface of the substrate in the muffler tail based on stainless steel , and the muffler While rotating the tail at a speed of 15 to 20 mm / sec per second, only the end portion of the muffler tail is heated by a gas burner internal flame for a predetermined time , and the portion not exposed to the burner flame is heated only by heat conduction. It is characterized by comprising steps .

  According to the present invention, it is possible to easily obtain a titanium coating muffler and a titanium coating muffler tail having an excellent rainbow color development characteristic of titanium easily and inexpensively.

  Hereinafter, the technology disclosed in the best mode for carrying out the present invention is a muffler constituting an exhaust system of an engine such as an automobile, and particularly relates to a tail portion at the tip of the muffler (FIG. 1).

  FIG. 1 is a conceptual diagram showing a muffler and a tail portion, FIG. 2 is a diagram showing a heat oxidation treatment, and FIG. 3 is a diagram showing a tail portion. In the figure, 1 is a muffler, 2 is a tail, 3 is a burner flame.

  The tail 2 itself is made of stainless steel, and is conventionally plastically processed into a desired shape by hand bending, mechanical bending, or the like, and its surface has a silvery stainless steel material.

Next, a titanium (Ti) coating that is the same color as stainless steel is applied to the surface of the tail 2 that has been plastic processed into a desired shape. In the coating process, a titanium film is formed on the surface of the tail 2 by a known method typified by sputtering (metal magnetic film forming method). Here, the film thickness is preferably about 20 angstroms.
Instead of titanium (Ti) coating, inconel (Ni alloy) coating may be used.

  Next, only the tip (P) of the tail 2 subjected to the titanium coating treatment is heated with an internal flame (3) of a gas burner at around 500 ° C. (FIG. 2). At this time, the tail 2 is fixed to a rotary table (not shown) set to a rotational speed of 15 to 20 mm / sec, and is heated by a burner flame fixed perpendicularly to the rotary axis of the rotary table. Move point. In addition, the part which the flame of a burner does not hit will be heated only by heat conduction.

By the heat oxidation treatment, a coloring effect showing a natural gradation from a “silver” metal background made of stainless steel to a deep blue unique to titanium is obtained on the surface of the tail 2 (FIG. 3).
If the heating temperature is too high or the heating time is too long (the rotational speed is too slow), the color returns to silver and eventually becomes a dull white. On the other hand, if the heating temperature is too low or the heating time is too short (the rotational speed is too fast), it does not become deep blue, but only changes to gold or magenta.
In addition to this heat oxidation treatment, the same effect can be obtained by anodization treatment.

  According to the above embodiment, the oxidation processing time can be shortened to ¼ to ５ compared with the case where the tail made of titanium material is oxidized and colored. Therefore, both processing costs and material costs are lower than in the case of a tail made of a titanium material, and it is possible to obtain an iridescent color similar to that of a titanium material in appearance.

  If the titanium coating technology according to the present invention is applied to parts such as mufflers and muffler tails, such as stainless steel products, such as motorcycle inner tubes, the unique color gradation of titanium and the durability obtained by the coating will result in the customer of the parts. Further improvement in suction power can be expected.

It is a conceptual diagram which shows a muffler and a tail part. It is a figure which shows a heat oxidation process. It is a figure which shows a tail part.

Explanation of symbols

1 Muffler 2 Tail 3 Burner flame

Claims (2)

In a muffler based on stainless steel, a step of forming a film made of one of titanium or inconel on the surface of the substrate ;
While rotating the muffler at a speed of 15 to 20 mm / sec per second,
Only the tip of the muffler is heated with a gas burner internal flame for a predetermined time ,
A method for producing a coating muffler that exhibits a natural gradation coloring effect, comprising a step in which the portion not exposed to the burner flame is heated only by heat conduction . In a muffler tail based on stainless steel, forming a coating made of one of titanium or inconel on the surface of the base material ;
While rotating the muffler tail at a speed of 15 to 20 mm / sec per second,
Only the tip of the muffler tail is heated with a gas burner internal flame for a predetermined time ,
The portion not exposed to the burner flame comprises a step of heating only by heat conduction.
A method of manufacturing a coating muffler tail that exhibits a natural gradation coloring effect .

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