JP2001334336A - Method for manufacturing metallic product to round front end and method for manufacturing metallic fork - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a metallic work which easily forms the front ends of comb parts round. SOLUTION: The front end of a handle 1 is provided with the plural comb part 4 and 5 in juxtaposition. Heat is applied to the front ends 6 of the comb part 4 and 5 formed by pressing to melt the front ends to form nearly spherical surface parts 7 by surface tension on the front ends 6. Roundness is formed at the front ends by solidifying the spherical surface parts 7 and is subjected to finishing by polishing using a polishing tool. The heat is applied to the front ends 6 without subjecting the front ends to three-dimensional working to melt the front ends and the spherical surface parts 7 may be easily formed on the front ends 6 of the comb part 4 and 5 by utilizing the surface tension.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a metal product having a rounded tip and a method for manufacturing a metal fork.

[0002]

Conventionally, a metal fork for a table or a kitchen used together with, for example, a spoon or a knife has a plurality of combs arranged side by side at the tip of a handle. In this method of manufacturing a fork, a plurality of comb portions are formed at the tip of a handle portion by sequentially punching a metal plate with a die using a pressing device. In such a fork, since a metal plate is formed by punching with a mold, the tip surface of the comb portion becomes rectangular and burrs are formed together. In detail, when viewed from the front end, the front end surface had a square surface with a sheared surface and a fractured surface. For this reason, for example, the comb portion is polished for mouthfeel, safety, and the like, and the end of the comb portion is rounded, or burrs or the like are used for finishing.

[0003] However, there is a limit to the rounded spherical shape of the tip of the comb portion by polishing. Therefore, for example, it is conceivable to grind the tip for a relatively long time or to combine cutting and polishing in order to make the tip round. There is a problem that a three-dimensional processing technique is required and it cannot be easily manufactured.

Accordingly, an object of the present invention is to provide a method of manufacturing a metal product having a rounded tip and a method of manufacturing a metal fork, which can be easily processed without using a three-dimensional processing technique or the like. .

[0005]

According to a first aspect of the present invention, a tip of a metal product is heated and melted to form a substantially arc portion by surface tension at the location, and thereafter, the arc portion is solidified. And forming a rounded tip at the tip.

According to the first aspect of the present invention, the metal is melted to form an arc portion using surface tension at the tip portion, and the arc portion is solidified.

According to a second aspect of the present invention, the sharp tip of the metal product is heated and melted to form a substantially spherical portion by surface tension at the portion, and then the spherical portion is solidified and rounded at the tip. Forming a metal product having a rounded tip.

According to the second aspect of the present invention, a metal is melted to form a substantially spherical portion at a sharp point by utilizing surface tension, and the spherical portion is solidified.

According to a third aspect of the present invention, there is provided a method for manufacturing a metal fork having a plurality of combs arranged side by side at a tip of a handle, wherein the tip of the comb is melted by applying heat to the tip by surface tension. A method for manufacturing a metal fork, comprising: forming a substantially spherical portion; solidifying the spherical portion; forming a rounded tip; and performing a finishing treatment.

According to the third aspect of the present invention, the tip of the comb portion is melted to form a substantially spherical portion at the location using surface tension, and the spherical portion is solidified.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described with reference to FIGS. The embodiment is a method for manufacturing a metal fork as a metal product. FIG. 1 shows a first step, in which a metal plate such as stainless steel is pressed by a press (not shown) using a metal mold and a mold unit 1 and the metal plate. A flat plate portion 2 for forming a later-described portion corresponding to a comb portion connected to the handle portion 1 is formed. The corner 3 of the flat plate portion 2 in the first step is formed at a right angle.

FIG. 2 shows a second step in which sharp comb portions 4 are formed on both sides of the flat plate portion 2 by a press (not shown) using another mold. Also, FIG.
The drawing shows a process, in which a sharp comb portion 5 is formed inside a comb portion 4 by a press device (not shown) using another mold. The tips 6, which are the sharp portions of the comb portions 4 and 5, are formed at a right angle because the plate-like material is processed by press working.

FIGS. 4 and 6 show a fourth step, in which heat is locally and intensively applied to the tip 6 of the comb portions 4 and 5 to melt the tip 6 locally. Due to the surface tension phenomenon, the molten metal is substantially hemispherical, that is, the entire periphery is arcuate due to the melting of the tip 6, and the spherical portion 7 is formed in which the entire periphery is an arc. The size of the spherical portion 7 is formed slightly larger than the tip 6 before processing. That is, the size (diameter D) of the spherical portion 7 is formed larger than the width W of the tip 6 before the processing (W <D). As means for applying heat to the tip 6 to locally melt the tip 6, it is necessary to accurately control the heat treatment heat amount and the heat treatment time, so that a heating device using electric energy may be used. preferable. Specifically, a DC pulse TIG welding machine is used, and the welding torch 8 is brought close to the tip 6 to melt the tip 6. Then, by cooling the tip 6 on which the spherical portion 7 is formed by natural cooling or the like, the spherical portion 7 is solidified.

FIG. 5 shows a fifth step. At the tip 6 having a substantially hemispherical spherical part 7 in the fourth step, since W <D as described above, the comb part 4 is formed. , 5 are finished so as to be smoothly continued from the base end 9 side of the comb portions 4, 5. Further, since the surface is darkened or discolored due to the application of heat, the tip 6 is finished to remove the discoloration. Finishing is performed, for example, by using a comb 4 on the peripheral surface of the cylindrical rotary polishing tool 10.
The front and back surfaces of the polishing tool 11 are polished, and the disc-shaped rotary polishing tool 11 is inserted between the comb portions 4 and 5, and the side face of the polishing tool 11 interposes the comb portions 4 and 5, that is, the comb portions 4. 5
The left and right side surfaces are polished to perform a finishing process. By the finishing process by this polishing process, a substantially hemispherical portion in which the entire periphery of the tip forms an arc shape is formed at the tip. As shown in FIG. 6, the size (diameter d) of the spherical portion 12 at the tip is equal to or slightly smaller than the width W of the tip 6 before processing (W = d, W> d). As described above, in the above embodiment, the tips 6 of the comb portions 4 and 5 of the fork which is a metal product are used.
Is heated and melted to form a spherical portion 7 having an arc of almost the entire circumference melted by surface tension at the six points of the tip, and then solidifying the spherical portion 7 to form a rounded tip. Thereby 3
The spherical portion 7 can be easily formed by applying heat to the tip 6 and melting the tip 6 without using dimensional processing and utilizing surface tension.

In the method of manufacturing a metal fork having a plurality of combs 4 and 5 arranged side by side at the tip of the handle 1, heat is applied to the tips 6 of the combs 4 and 5 to melt them. Almost the entire circumference melted by the surface tension forms an arc-shaped spherical portion 7,
Thereafter, after the spherical portion 7 is solidified to form a rounded tip,
Polishing is performed by the polishing tools 10 and 11, and finishing is performed. By applying heat to the tip 6 without using three-dimensional processing and melting and utilizing surface tension, the spherical portion 7 can be used as a tip of the combs 4 and 5. 6 can be easily formed, and as a result, a soft and safe fork can be provided.

Further, by using a heating device using electric energy as a means for applying and melting the heat, the heat treatment heat amount and the heat treatment time can be accurately controlled. The spherical portion 7 can be formed by local melting.

In addition, by making the spherical portion 7 formed on the tip 6 a hemispherical shape, a gentle curved surface is formed from the base end side of the comb portions 4 and 5 to the tip 6 so that the spherical portion 7 and the finished spherical portion 12 are finished. Is formed, the comb portions 4 and 5 are formed by continuous gentle lines, and the mouthfeel can be further softened.

FIG. 7 and FIG. 8 show an example in which the edge is used as a tip of a metal kitchen article (houseware article) such as a pot, a bowl, and a pot. The same parts as those in the above embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. As shown in FIG. 8, heat is applied to the edge 6 of a strip-shaped metal plate 21 whose head is cut off diagonally to form an arc-shaped cross section. At this time, the diameter D is formed larger than the width W of the tip 6. Next, as shown in FIG. 7, the tip 6 is finished by polishing or the like, and its diameter d is equal to the width W,
It is formed slightly smaller.

As described above, the tip 6 of the metal plate 21 as a metal product is heated and melted to form a substantially arc portion by surface tension at the location. Thereafter, the arc portion is solidified and rounded at the tip. The edge of metal kitchen utensils such as, for example, pots, balls, pots, etc. can be easily formed into a rounded shape.
Furthermore, the tip 6 can be easily rounded even if the edge of the strip-shaped metal plate 21 is obtained by cutting the head obliquely from a cylindrical one instead of a cylindrical one.

The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. For example, a plasma welding machine, a resistance welding machine, a high-frequency induction heating device may be used as the electrical means as a means for melting the tip, or gas combustion heat of a gas welding machine or laser light irradiation may be used. Further, as a polishing means, the comb portion of the fork may be inserted into a belt-type polishing device to finish the metal product. Further, the present invention is not limited to use in metal kitchen utensils such as the aforementioned forks, pots, bowls and pots, but can be applied to various metal products such as tweezers.

[0021]

According to the first aspect of the present invention, the tip of the metal product is heated and melted to form a substantially arc portion by surface tension at the portion, and then the arc portion is solidified and rounded at the tip. This is a method for producing a metal product having a rounded tip, characterized in that the rounded tip can be easily formed by utilizing the surface tension of a molten metal.

According to a second aspect of the present invention, the sharp tip of the metal product is heated and melted to form a substantially spherical portion by surface tension at the location, and then the spherical portion is solidified to have a rounded tip. This is a method for producing a metal product having a rounded tip, characterized in that the sharp tip can be easily rounded by utilizing the surface tension of a molten metal.

According to a third aspect of the present invention, there is provided a method for manufacturing a metal fork having a comb portion arranged side by side at a tip end of a handle portion, wherein the tip portion of the comb portion is heated and melted, and a substantially spherical portion is formed on the tip end by surface tension. Forming a metal fork after solidifying the spherical portion to form a rounded tip, and then performing a finishing process, utilizing the surface tension of the molten metal. The end of the comb can be easily rounded.

[Brief description of the drawings]

FIG. 1 is a partially enlarged plan view showing a first step of an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a part showing a second step showing one embodiment of the present invention.

FIG. 3 is an enlarged perspective view of a part showing a third step showing one embodiment of the present invention.

FIG. 4 is an enlarged perspective view of a part showing a fourth step showing one embodiment of the present invention.

FIG. 5 is a partially enlarged plan view showing a fifth step of the embodiment of the present invention.

FIG. 6 is a sectional view showing a fifth step according to the embodiment of the present invention.

FIG. 7 is a partially enlarged perspective view showing another embodiment of the present invention.

FIG. 8 is a sectional view of the essential part.

[Explanation of symbols]

 4,5 Comb part 6 Tip (sharp part) 7 Spherical part (arc part) 10 11 Polishing tool (finishing tool)

Claims (3)

[Claims] 1. The method according to claim 1, wherein the tip of the metal product is heated and melted to form a substantially arc portion by surface tension at the location, and thereafter, the arc portion is solidified to form a rounded tip. Of manufacturing metal products with rounded tips. 2. A method in which a sharp tip of a metal product is heated and melted to form a substantially spherical portion at the location by surface tension, and thereafter, the spherical portion is solidified to form a rounded tip. A characteristic method of manufacturing metal products with rounded tips. 3. A method of manufacturing a metal fork in which a comb portion is juxtaposed at a tip of a handle portion, wherein a heat is applied to the tip of the comb portion to melt the surface, and a substantially spherical portion is formed at the tip by surface tension.
Thereafter, the spherical portion is solidified to form a rounded tip, and then a finishing process is performed.