JPS6319249B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to a method for forming a newly constructed hem around the opening of pots obtained by molding a metal plate, and particularly relates to a method for forming a hem of a new configuration on the outer periphery of an opening of a pot obtained by molding a metal plate. The present invention relates to a method that is advantageous when applied to the edge wrapping of pots using multi-layered steel plates formed by metal polymerization. [Prior Art] A conventional pan having a hem around the opening of the pot body has various forms as shown in FIG. 5. That is, a in FIG. 5 shows a circular curved portion 11a by curving the periphery of the opening of the pot body 10 outward.
b is a similar square bent part 11b.
c is a part that protrudes like a brim and forms a 12, and a circular curved part 11C is formed below it, and d is a part that forms a slit in the opening of the pot body 10. circular tubular edge wrapping member 11
d is attached separately. By forming a hem around the opening of the pot using these methods, the strength of the opening is increased and the upper edge of the opening is prevented from being deformed or damaged by denting or protrusion due to use. can do. [Problems to be Solved by the Invention] However, it is inevitable that gaps remain in the hemline portion formed as described above due to processing, and water infiltrates through these gaps during use. Even if the pot is made of a steel plate, such as stainless steel, which is said to be rust-free, rust will gradually form from this part, and since the folded part is formed by bending, the folded part will become folded after many years of use. It is inevitable that limescale etc. will accumulate in the area, making it unclean. In addition, in recent years, a metal plate called multilayer steel plate, which is a combination of laminated metal plates such as stainless steel, aluminum, carbon steel, and copper, has been attracting attention as a material for such pots. When pots are manufactured using the above-mentioned method, and when forming the edge wrap portion as shown in FIG. There is a problem of shortening the lifespan of The present invention relates to a novel method for forming a hem that eliminates the problems associated with such a hem wrap structure, and is particularly applicable to pots using the above-mentioned multi-layered steel plate to exhibit excellent effects. . [Means for Solving the Problems] That is, the present invention relates to a rim of a pot obtained by molding a metal plate, and a flange that protrudes outward around the entire opening of the molded pot body. forming a section, and deeply cutting the center part of the thickness leaving the upper surface of the flange part,
Then, the lower surface part is shallowly scraped to form a pair of long and short projecting edges by the upper surface part and the lower surface part, and the projecting edge of the lower surface part is bent upward to follow the deep removed surface of the central part. A method for wrapping metal pots, comprising: bending the edge of the upper surface part downward to align it with the bent edge surface of the lower surface part, and integrating them by applying pressure. It is. As described above, unlike the conventional method of forming an edge by bending the flange or forming an edge by using other materials, the present invention involves scraping a part of the periphery of the flange in the thickness direction, and forming a pair of long and short protrusions on the upper and lower surfaces. The short protrusion formed on the lower surface is bent upward, and then the long protrusion formed on the upper surface is integrated along this. In this case, the metal plate used may be a single plate of metal conventionally used for pots such as stainless steel, aluminum, copper, etc. It is particularly effective when applied to metal plates called multilayer steel plates that are laminated and combined. Such multi-layered steel plates can be used in cooking heating containers such as pots by combining the various plates to be laminated, and can be used to cook foods that heat well when boiling and are non-stick. Typical combinations are shown in Table 1. The symbols in Table 1 are abbreviations for the following metals. ST...Stainless steel C...Carbon steel Cu...Copper AL...Aluminum

【table】

[Table] In the above table, the method of the present invention can also be applied to multilayer steel plates whose surfaces are further plated with various metals. In the method of the present invention, scraping off the flange can be easily achieved by using a cutting tool with a tip shape that matches the scraped part, and
The protrusion thus formed can be easily bent using a predetermined winding roll. The folded part after being bent in this way can be finally finished by applying pressure, but such applying pressure can also be sufficiently achieved by applying pressure during surface finishing by buffing. Ru. When applying the above multilayer steel plate to the present invention, it is desirable to carry out the following steps.
That is, a multilayer steel plate usually uses a relatively soft material such as aluminum (AL) for the inner layer, and a hard metal such as stainless steel (ST) for the outermost layer on the front and back. In carrying out the method of the present invention, the top surface is scraped off so that the soft material such as aluminum (AL) is exposed on the scraped surface. By doing so, the hard material forming the surface layer of the lower surface, such as stainless steel (ST),
The aluminum (AL) surfaces of the upper surface portion come into contact with each other due to bending, and as a result of pressurization, the soft material is pressed against the hard material, resulting in their tight integration. It becomes stronger and is effective in extending the life of the hem wrap. [Function] The method of the present invention involves forming a pair of long and short ridges by scraping on the thick part of the flange formed at the opening of the pot body, and sequentially bending the shorter ridges to form a substantially It is possible to easily form an almost completely integrated hemline that has no internal cavities and does not allow water to enter through the bent portions. No rust will occur. Therefore, it can withstand long-term use. [Example] The present invention will be described in detail below with reference to the drawings. First, a multilayer steel plate 1 shown in FIG. 1 and Table 2 below was used as a material.

[Table] Regarding this 7-layer steel plate 1, a pot body 2 was molded using a mold (not shown) so that the surface layer No. 1 in Table 2 was on the outside of the pot. Then, the peripheral wall of the opening of the pot body 2 is bent outward to form a horizontal flange 3, and then, as shown in Figure 3, the thick part of the flange 3 is cut with a cutting tool to carve the part A in the diagram. I took it. The flange 3 formed by this scraped part A is deeply cut from the third layer (AL layer) to the fifth layer (ST layer) from the top, leaving the upper surface as it is.
In addition, the sixth layer (C layer) and seventh layer (ST layer) on the lower surface of the flange 3 are shallowly shaved off, and a long ridge 4 is formed on the upper surface of the flange 3, and a long protrusion 4 is formed on the lower surface. It has a short ridge 5 on the side. The short edge 5 of the pair of long and short edges 4 and 5 thus formed is bent by a winding roller along the dotted line in FIG. 4 was bent along the dotted line so as to cover the surface of the ridge 5, and these were integrated by buffing. In this way, a hem-wrapping portion was formed that was tightly packed inside without creating any gaps due to the rolling-up like in the conventional hem-wrapping portion. As shown by B in Figure 4, the only exposed parts of the end of the multilayer steel plate in this hem wrap are the AL layer and ST layer, but by buffing, these parts are completely integrated and water is removed. There was no infiltration of water. [Effects of the Invention] The method of the present invention involves forming a flange around the opening of the main body of a pot, processing the flange to form a pair of long and short ridges on the upper and lower surfaces, and sequentially bending these to form a substantially This means that there is no internal cavity and a strongly integrated edge wrapper can be obtained, which significantly improves the strength of the opening of pans and prevents deformation and damage of the opening against impact. It can be prevented. In addition, since such a hem wrap is completely different from the simple roll-up formation of the flange like the conventional hem wrap, there is no risk of water entering from the hem wrap, and therefore there is no risk of rust, water stains, etc. There is no adhesion or formation of filth, and the pots can be used effectively for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an example of a metal plate for forming pots to which the method of the present invention can be applied, and FIG. 2 is a partial longitudinal cross-sectional view showing one step of forming a hemline portion by the method of the present invention. . FIG. 3 is a partial longitudinal cross-sectional view showing the cutting of the flange to form the edge-wrap portion, and FIG. 4 is a partial longitudinal sectional view showing the bending of the flange edge. Also, the fifth
The figure is a partial longitudinal sectional view showing a conventional hem wrapper. 1... Multilayer steel plate, 2... Pan body, 3... Flam part,
4, 5... ridge.

Claims (1)

[Claims] 1. For wrapping around the edges of pots obtained by molding a metal plate, a flange that protrudes outward is formed around the entire opening of the molded pot body, leaving the top surface of the flange intact. The central part of the thickness is deeply scraped and the lower surface part is shallowly scraped to form a pair of long and short ridges by the upper and lower surfaces, and the ridge of the lower surface is bent upward. Then, bend the protruding edge of the upper surface part downward to align it with the bent protruding edge surface of the lower surface part, and integrate them by applying pressure. A distinctive method for wrapping metal pots.