JPS62296937A - Supporting method for cantilever core - Google Patents

Abstract

PURPOSE:To save trouble of patching for casting penetrating hole and to reduce labor and core costs by arranging dissipating plate at gap between cope and drag molds and a cantilever core and casting as supporting the cantilever core by this plate. CONSTITUTION:The dissipating plates 7, 8 using dissipating model material are arranged in the space 5 formed in the model by the cope 1, the drag 2 and the cantilever core 4, and the core 4 is supported at the front end side and the lower side. Therefore, core print size is possible to shortened and also arrangement of the casting penetrating hole for supporting the cantilever core is not necessary. And, at the time of pouring molten metal into the cavity part 5 through a sprue 3, the dissipating plates 7, 8 are gradually replaced by the molten metal and so smooth casting operation is executed.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention (Field of Industrial Application) This invention was devised to reduce the number of man-hours required during casting work, especially in the finishing process. The present invention relates to a method for supporting a cantilever core in a molding line.

(Prior Art) Conventionally, a method as shown in FIG. 2 has been used as a method for supporting a cantilever core in the above-mentioned green molding line. In Fig. 2, a is the upper mold.

b is the lower mold, C is the cantilever core, and d is the core. f
is the cavity formed by the upper mold a, the lower mold, and the cantilever core C and the core d in order to produce the finished product F shown in FIGS. 3(a) and (b) by casting. be. Note that e indicates that the casting hole 9g for supporting the core is a plurality of supporting tools.

l indicates the baseboard dimension of the cantilever core C.

In general, when a cantilever core C is used that has a long overall length and is large, it tends to sag when supported in the mold, so in order to prevent this sag, the baseboard size l is
A method is used in which the tip of the core C is supported by the core d by increasing the length of the core, or by providing a cast hole e for supporting the core and fitting another core d into the hole e.

(Problems to be Solved by the Invention) In the above-mentioned so-called cantilever core support method, since a cast hole is provided, the hole created by the cast hole in the finished casting product is placed in the sixth position. As shown by k in Figure 3 (a), the final product must be made by embedding using means such as plate welding, which requires hole filling costs, core costs, and man-hours, and cantilevered Increasing the baseboard size of the core in order to prevent the core from sagging has the disadvantage that the manufacturing cost of the core increases accordingly.

It is an object of the present invention to solve the above-mentioned problems.

(Means and effects for solving the problems) The present invention was made in view of the above points, and the present invention has been made in view of the above points. A vanishing plate made of a so-called vanishing model material such as polystyrene is provided to support the core from the bottom side of the core and/or from the front end of the core, allowing the cantilevered core to remain stable in the mold. can be supported by,
Further, since the baseboard size is shortened and there is no need to provide a cast hole for supporting a single cantilever core, the core cost and labor can be significantly reduced.

Since the vanishing plate is gradually replaced by molten metal during casting, the casting operation is performed smoothly.

(Example) Next, embodiments of the present invention will be described based on the drawings.

In FIG. 1, 1 is an upper mold, 2 is a lower mold, and 3 is a sprue and a runner. 4 is a cantilever core, and a cavity 5 is formed in the mold together with the upper mold 1 and the lower mold 2. Number 6 is a supporting tool (keren), which is usually used in multiple pieces. Numerals 7 and 8 are vanishing plates made of vanishing model material such as styrofoam, and the thickness thereof is equivalent to the wall thickness of the cast product. I am starting to support it. 9 indicates the baseboard dimension of the core 4, which needs to be shorter than the conventional one.

When molten metal is now injected into the space 5 through the sprue 3, the vanishing plates 7.8 made of styrofoam or the like are gradually replaced with the molten metal, and smooth casting work is performed.

There are two or more embodiments of this invention.

Since the vanishing plate 7.8 is set between the main mold and the core 4, the two cantilevered cores 4 are supported by the vanishing plate 7.8 from their front ends and lower sides. Since the core 4 is stably and reliably supported within the cavity of the mold, it is no longer necessary to provide a special cast hole for supporting the core as in the past, and therefore the trouble of welding the cast hole with a fill plate is reduced. This also reduces the size of the core baseboard. Therefore, core costs can be significantly reduced.

(Effect of the invention) This invention is constructed as described above in detail.

The cantilever core can be supported extremely easily and reliably in the green mold making line, and the number of maintenance steps in the casting and finishing process can be reduced.

In other words, a vanishing plate is set between the main mold and the cantilevered core, and this vanishing plate supports the cantilevered core appropriately from the front end and the bottom, so the baseboard size of the core can be reduced. This eliminates the need to provide a cast hole for supporting the cantilever core as in the past, which eliminates the need for welding filled plates in the cast hole, resulting in a significant reduction in man-hours and core costs. becomes possible.

Since the vanishing plate is gradually replaced by molten metal during casting, the casting operation is performed smoothly.

[Brief explanation of the drawing]

Fig. 1 is a diagrammatic illustration for understanding the method of supporting a cantilever core according to the present invention, Fig. 2 shows a conventional method, and Fig. 3 (al is a cross section of the finished product of the casting). l, Figure 3Cb
) is an arrow view seen from A-A. 1... Upper mold, 2... Lower mold, 3... Sprue and runner. 4...Cantilever core, 5...Mold cavity. 7.8... Vanishing plate. Patent applicant: Komatsu Ltd. Representative (patent attorney): Tobue Matsuzawa 1 Figure II 2

Claims (1)

[Claims] A vanishing plate having a thickness equivalent to the wall thickness of the cast product is appropriately provided in the cavity formed by the upper mold, the lower mold, and the cantilever core, and the cantilever core is supported by these vanishing plates during casting. A method for supporting a cantilevered core.