JPH0531631A - Hollow metal product and manufacture thereof - Google Patents

Abstract

PURPOSE:To provide a product capable of being produced in quantity at low cost by forming a press-processed layer extending across both joined members on the outer surface side of a fitting-joining line. CONSTITUTION:Plural, dividedly formed hollow members 1, 2 are fitted and joined to each other. A press-fitting process layer 7 extending over the members 1, 2 is formed along fitting parts 15, 16 or a fitting-joining line by a roll-pressing process to obtain a desired hollow metal product.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hollow metal product and a method for manufacturing the same, and provides a new product such as various containers made of copper-based or aluminum-based metal and a preferred method for manufacturing the same.

[0002]

2. Description of the Related Art It has been a conventional practice to manufacture hollow containers and appliances for Buddhist altars and other vessels with a bulge in the middle by using a metal such as copper, bronze or brass, or a metal such as aluminum. Various implementations. That is, it is not preferable in a vase, a vase, and the like that a fire stand for Buddhist utensils is a solid entity, which is disadvantageous in terms of material cost, and is large in weight.

By the way, in such a hollow container, the core can be cast as a split method, but when the core is split, the operation is extremely complicated and, on the other hand, it is cut into a solid body. Since the hollow container body requires a great deal of man-hours and is expensive, it is common to insert and join a cast body as a divided body body in recent years.

That is, a plurality of pieces divided in the vertical direction are fitted and integrally molded, and according to this method, each body is prepared as a hollow body in a simple and mass-producible manner. In addition, the intended metal product can be obtained easily and at low cost simply by fitting and joining them.

[0005]

However, in the conventional fitting and joining method as described above, the joining line must be exposed at the joining boundary portion. That is, if the products manufactured as a plurality of parts are fitted and joined, line traces must be left at the boundary joining part of both parts, and in particular, this means that a surface treatment layer is formed on the surface of the product. When it is formed and applied, the application liquid permeates and adheres to the joining line and becomes remarkable, and in any case, it becomes an unfinished product.

Therefore, in order to obtain a concrete product, it is indispensable to match the above-mentioned joining line with the V-shaped groove portion formed on the outer surface of the product, that is, by joining the joining line and the groove bottom portion. The presence of the line cannot be recognized, and the bonding line is sufficiently covered because the coating liquid gathers at the groove bottom even when the surface treatment is performed.

However, it is obvious that matching the joining line with the V-shaped groove as described above is not always preferable in designing the product, that is, it bulges to form the V-shaped groove across the outer surface of the product. Since the ridges are to be installed in a circle, the design of the peripheral surface of the body is divided by setting the joining line. Therefore, the design of the divided molded body is restricted depending on the position of the joining line, or the joining line cannot be formed at a position such as a bulge which is advantageous for casting demolding. It has disadvantages such as not being able to obtain sufficient manufacturing merits by joining.

[0008]

DISCLOSURE OF THE INVENTION The present invention has been studied by solving the above-mentioned disadvantages and drawbacks of the prior art and forming a specific processing layer on the outer surface side of the fitting and joining line. It has succeeded in eliminating such disadvantages and disadvantages accurately, and is as follows.

A hollow-shaped body formed by split molding is fitted and joined, wherein the fitting-joining line is located at a bulge portion of the hollow product, and moreover, on the outer surface side of the fitting-joining line. A hollow metal product in which a crotch-pressed layer is formed on both joined bodies.

[0012] A step of fitting and joining a plurality of divided central body parts, and a rolling process of a region crotch to both body parts joined along the fitting and joining line after the fitting and joining. A method for producing a hollow metal product, which is characterized by being combined with the step of:

[0011]

By performing split molding, it is possible to mass-produce a product having concave and convex shapes on the inner surface and the outer surface.

[0012] Separately molded hollow parts are fitted and joined, wherein the fitting and joining line is located at the bulging portion of the hollow product, and demolding of each of the parts molded by splitting, in particular, Makes it easy to remove medium-sized molds.

By forming a crotch pressing layer on both body parts joined to the outer surface side of the above-mentioned fitting joint line, the joint line between the two body parts which has been divided and molded is integrated and eliminated. However, the bonding line is not sensed even by the surface treatment.

A step of fitting and joining a plurality of divided central body parts, and a rolling process of a region crotch to both body parts joined along the fitting and joining line after the fitting and joining. As described above, a product that does not leave a joining line can be appropriately and easily obtained by combining the steps described above.

Not only when the above-mentioned joining line is located at the bulging portion by rolling the rolling roller as described above, but also at the constricted portion which is recessed to that extent, or in some cases linear groove. The shape of the peripheral surface of the rotating roller can be appropriately designed for the portion as well to effectively perform the rolling process.
Therefore, the forming position of the joining line can be freely set, and it is possible to appropriately adopt it under free design conditions.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A concrete embodiment of the present invention as described above will be described with reference to the accompanying drawings. A flower stand used for a Buddhist altar as an example of the product obtained by the present invention is as shown in FIG. It is obtained as a two-part or three-part system as shown in FIG.

That is, in the case of the two-part system shown in FIG. 1, the bulging parts 11, 12 or 21, 22 are respectively arranged vertically.
It is assumed that the upper body 1 and the lower body 2 having the hourglass shape formed by are cast, the upper body 1 has a cylindrical shape, and the lower body 2 has a bottom 20 formed in a constricted portion in the middle. The upper opening of the upper body 1 is the insertion opening 3, and the bottom of the lower body 2 is the support seat 4.
It is as shown in the figure.

The lower portion of the upper body 1 and the lower body 2 and the upper portion as described above are provided with fitting portions 5 and 6 which are fitted to each other. Fitting steps 16 are formed on the outer surface side of the fitting portion 6 and are fitted to each other. With respect to these fitting steps 15 and 16, the upper body 1 side may be the outer side and the lower body 2 side may be the inner side. Clearly the same.

As described above, the fitting portions 15, 16 are mutually attached.
The one fitted in (1) is along such a fitting and joining line, and the crimping layer 7 is formed on the outer surface of the upper and lower bodies 1 and 2. The rolling layer may be as thin as 1 to 3 mm in width and 0.03 to 0.2 mm in thickness.
, The joint line is erased, and both parts 1 and
2 is obtained as a completely integrated product.

As a concrete pressure-bonding method, it is most rational to use a pressure roller and the processing operation is easy. However, if a few man-hours may be required, the fitted body 10 is rotated. However, any method of crimping may be used, and an appropriate tool can be selected as the tool in each case. In addition, the crimping process using the pressure roller can be easily applied to the constricted part of the body, etc.
In the rolling process for press-fitting deformation of 1 mm or less, the outer surface is rarely deformed, and its correction is easy.

In the case of the three-body system as shown in FIG. 2, the upper body 1 is further divided into two and fitted. Such a fitting and joining line of the upper body 1 is formed in the constricted portion in the upper part of the device, particularly in the annular portion of the non-slip protrusions 8, so that it is not visible even if it follows the conventional simple fitting method. It never becomes.

However, in the lower body 2 as well, it is clear that in this embodiment in which the waist portion is formed in the middle, and particularly the linear line 9 is formed, the fitting joining line may be formed at this bottom portion. Is. In addition, although the illustrated embodiment representatively shows a flower stand, the present invention relates to a fire stand (rothoku stand), an incense holder and other Buddhist items (for household and temples and shrines, various vases and figurines, etc. Also, it is obvious that the above-mentioned pressure-bonded processed layer can be appropriately formed by adopting it at a plurality of positions.

A concrete mode for setting a fire is as shown in FIG. 3, and the press-processed portions 7 after fitting according to the present invention have a considerable length by being adopted above and below the intermediate body 13, respectively. However, it is possible to easily obtain a fire with a large number of irregularities as shown in the figure, in which the joining line is not exposed at all.

FIG. 4 shows a case where the present invention is implemented as an incense burner, and in this case, at least a part of the fitting stage 1
It is shown that it is carried out as a joint surface without 5 and 16, and the intermediate portion body 14 whose inner surface side is narrowed in the height direction has a flat joint surface even in a part of the present invention. Can be effectively implemented.

As a concrete example of manufacturing, in order to obtain a fireplace for a Buddhist altar as shown by a brass die-casting body, a 0.05 mm metal roller is used at the fitting and joining line at room temperature.
By performing the rolling process of No. 3, the joining line was completely erased, and it was possible to obtain a product in which the joining line was not recognized at all even after the surface treatment, and the number of steps was very small.

In the case of bronze or aluminum products, the rolling process is softer than brass products containing a considerable amount of Zn and the like, so that a lighter processing force is sufficient, and in any case, it will be easy. What can be done is technically clear.

[0027]

According to the present invention as described above, a product can be mass-produced at a low cost by the split joining method, and the joining line can be effectively erased, and the joining line can be obtained even if painting or surface treatment is performed. Is a product that cannot be recognized at all, and therefore, it is possible to obtain the desired product by a flexible design because it is limited by the joining line to the appearance, appearance or shape or pattern of the body. Since all of the above are sufficiently obtained, the invention is industrially effective.

[Brief description of drawings]

FIG. 1 is a partial cutaway side view showing one embodiment according to the present invention.

FIG. 2 shows another embodiment according to the present invention.
It is a partially cutaway side view similar to FIG.

FIG. 3 is a partially cutaway side view showing an example in which the present invention is implemented as a fire.

FIG. 4 is a partially cutaway side view showing an example in which the present invention is implemented as a incense burner.

[Explanation of symbols]

1 Upper body 2 lower body 3 insertion slot 4 support seat 5 Fitting part 6 Fitting part 7 Crimping layer 8 ridges 10 body 11 bulge 12 bulge 13 Intermediate body 14 Intermediate body 15 mating steps 16 mating stages 20 bottom

Claims (2)

[Claims] 1. A hollow molded body which is divided and molded is fitted and joined, wherein the fitted joining line is located at a bulge portion of the hollow product, and the outer surface of the fitted joining line. A hollow metal product, wherein a crotch-pressed layer is formed on both parts joined to the side. 2. A step of fitting and joining a plurality of split-shaped central bodies, and a step of rolling the crotch region between the two bodies joined along the fitting and joining line after the fitting and joining. A method for producing a hollow metal product, characterized by being combined with a step of press working.