JPS6038216B2 - Method for manufacturing hollow metal parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing hollow metal parts such as valves and pipe fittings.

Conventionally, hollow metal parts of this type have been manufactured by means such as casting, forging, die casting, powder metallizing, etc., each of which has its own advantages but also has disadvantages that are difficult to overcome.

The present invention combines the above-mentioned means to easily manufacture hollow metal parts.
The purpose is to manufacture it at low cost.

Embodiments of the present invention will be described below with reference to the drawings.

First step... (Figure 1) An outer core mold 1 is made based on the outer dimensions of the hollow metal part to be manufactured, and an inner core mold 2 is made of relatively inexpensive material such as wood or plaster based on the inner dimensions. Each is manufactured using materials that are easy to process.

Second step (Fig. 2) Based on the outer core mold 1, the first and second materials 4 and 5 are sheet-metal processed by the rubber foam sheet metal press 3 to form the first and second shell grains 6, 7 (see Figure 3).

Third step... (Fig. 4) Based on the inner core mold 1, the third and fourth materials 8 and 9 are processed into sheet metals using a rubber foam sheet metal press 3' to form the first and second materials.
Endothelial shells 10 and 11 (see FIG. 5) are manufactured.

Fourth step... (Figure 6) First and second outer skin shells 6, 7 and first and second inner skin shells 10, 11
The annular skin layer 12 is manufactured by joining and fixing the two.

Fifth step (Fig. 7) 0 Molten metal 13 is injected into the annular portion 12a of the shell layer 12 by die casting.

Sixth step (Fig. 8) High hydraulic pressure is applied to the hollow part 12b of the shell layer 12 into which the Rakuyo 13 is injected and cast, and forging is performed by internal pressure.

At this time, the shell layer 12 is forged at a low temperature, and the internal material 13', in which the molten metal 13 has solidified, is forged at a high temperature. In addition, at this time, the forging die is used for the pair of outer skin shells 6 and 7 manufactured in the second step.
Manufactured using. Seventh step (Fig. 9) The burr 14 is removed to form a predetermined hollow metal part.

In the above explanation, the core mold 1 was manufactured using non-ferrous metals and light metals in order to facilitate manufacturing and reduce costs. It becomes unusable.

Therefore, in the present invention, the first and second outer shells 6 and 7 processed by sheet metal processing in the second step are joined as shown in FIG. 10 to form a hollow outer shell layer 15, and the molten metal 13 is injected into the inside 15a. After making a coin (Fig. 11), it is forged to form an outer shell layer 15 and a molten metal 1.
3 forges the solidified internal material 13', and then burrs 1.
6 is removed and a core mold 17 for the outer shell (i.e., outer core mold 1) is manufactured (Fig. 12), and this core mold 17 is replaced with outer core mold 1.
The outer skin shells 6 and 7 were manufactured in place of the above.
In addition, the first and second inner skin shells 1 processed by sheet metal processing in the third step are
0 and 11 are joined as shown in Fig. 13 to form a hollow endothelial shell layer 1.
8 and inject and cast the molten metal 13 into its interior 18a (FIG. 14), and then forge the inner shell layer 18 and the inner material 13' in which the molten metal 13 has solidified, and then remove the burr 19. A core mold 20 (ie, inner core mold 2) for the inner skin shell was manufactured (FIG. 15), and this core mold 20 was used in place of the inner core mold 2 to manufacture the inner skin shells 10 and 11.

As a result, even if the strength of the outer and inner core molds 1 and 2 is significantly reduced, hollow metal parts of the same shape can be manufactured continuously, and the outer and inner core molds 1 and 2 can be manufactured extremely easily and at low cost. The manufacturing cost of hollow metal parts can be reduced.

In addition, in the second and third steps, the first and second materials 3 and 4 and the third and fourth materials 8 and 9 are stacked in two sheets, respectively, and then formed into a pair of outer and inner skin shells using a rubber foam sheet metal press 3 and 3'. 2 pieces each of 6, 7, 10, 11 6a, 6b, 7a
, 7b, 10a, lob, 11a, 11b (Fig. 16,
(See Fig. 17) Made of sheet metal, the inner outer and inner skin shells 6a, 7a
, 10a, 11 in the same manner as described above.
0 may be manufactured and used in place of the outer and inner core molds 1 and 2, and hollow metal parts may also be manufactured using the outer outer and inner skin shells 6b, 7b, 10b, and 11b.

In this way, it becomes possible to operate the hollow metal part manufacturing process continuously without temporarily stopping the process, and the operating efficiency can be improved.

As described above, it has the following advantages.

■ Since the outer and inner skin shells 6, 7, 10, and 11 are made from sheet metal using rubber form sheet metal presses 3 and 3', the surface pressure applied to the outer and inner core molds 1 and 2 is 4.0% lower than when forging, so the amount of material is small. For the production of
It becomes possible to manufacture the outer and inner core molds 1 and 2 using soft metal, etc., and the manufacture of the outer and inner core molds 1 and 2 becomes simple and inexpensive. (2) When pouring the molten metal 8, the molten metal 8 does not come into direct contact with the die-casting mold, so the thermal influence on the die-casting mold can be reduced.

Therefore, it is possible to use yellow steel and steel materials that are difficult to produce using conventional die casting. ■ The shell layer 12 is forged at a low temperature, and the internal material 13' in which the molten metal 13 has solidified is forged at a high temperature, so the thermal influence on the forging die is reduced, and the deformation resistance during forging is reduced by the internal molten metal 8. This can be reduced by thermal effects, allowing forging with a small pressing force.

Therefore, the life of the forging die is extended, and it becomes possible to use low-grade die materials. Furthermore, the surface condition of the product can be improved. Further, the shell layer 12 and the internal material 13' made of the molten metal 13 can be integrated into a forge, and the material (the skin layer 12, the internal material 13' made of the internal molten metal 13 solidified) can be integrated by forging.
The ability to improve the mechanical properties of ' is an advantage compared to a manufacturing method using only die casting.

The shell layer 12 and the molten metal 13 are preferably made of the same material, but may be made of materials with different components.

■ A new core mold 17 is self-produced along with the outer skin shells 6 and 7 that form the skin layer 12 based on one outer core mold 1,
Furthermore, in addition to manufacturing the forging mold, a new core mold 20 is self-produced together with the inner shells 10 and 11 that form the skin layer 12 based on one inner core mold 2, which simplifies the process and reduces costs. It is inexpensive and is the most suitable manufacturing method for manufacturing a wide variety of hollow metal parts in small quantities.

Since the present invention is configured as described above, even if the strength of the outer and inner core molds 1 and 2 is weakened, hollow metal parts of the same shape can be continuously manufactured, and the outer and inner core molds 1 and 2 can be easily and inexpensively manufactured. Can be manufactured.

Therefore, hollow metal parts can be manufactured easily and inexpensively.

In addition, it is possible to reduce the thermal influence on the casting mold when pouring the molten metal 13, and it is also possible to integrate the inner material 13' made of the skin layer 12 and the molten metal 13 by forge welding, and improve its mechanical properties by forging. Metal parts with mechanical properties can be manufactured.

[Brief explanation of the drawing]

1 to 9 are explanatory diagrams showing the manufacturing method according to the present invention in the order of steps, FIGS. 10 to 15 are explanatory diagrams in the order of steps when manufacturing a core mold, and FIGS. 16 and 17 are explanatory diagrams showing the manufacturing method according to the present invention. It is an explanatory view showing one process in the case of manufacturing a mold and a hollow gold layer part at the same time. 1 is an outer core type, 2 is an inner core type, 6 and 7 are outer shells, 10,
11 is the inner grain, 12 is the shell layer, 13 is the molten metal, and 13' is the internal material in which the molten metal has solidified. Figure 1 Figure 2 Figure 3 Figure 6 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Figure 17

Claims (1)

[Claims] 1. Outer and inner core molds 1 and 2 are manufactured based on the outer and inner dimensions of the hollow metal part to be manufactured, and the outer and inner core molds 1 and 2 are used to form the first,
The second outer skin shells 6, 7 and the first and second inner skin shells 10, 11 are manufactured, and then the first and second outer skin shells 6, 7, 10, 11 are joined to form a skin having an annular portion 12a. After manufacturing the layer 12 and injecting and casting the molten metal 13 into the annular portion 12a of the skin layer 12, the skin layer 12 and the inner material 13' in which the molten metal 13 has solidified are forged together to form a hollow metal. A method for manufacturing hollow metal parts, the method comprising: manufacturing the parts. 2 The inner material 13 in which the shell layer 12 is at a low temperature and the molten metal 13 is solidified
2. The method for manufacturing a hollow metal part according to claim 1, wherein the step ' is forged at a high temperature.