JPS6188940A - Casting mold - Google Patents

Abstract

PURPOSE:To improve pouring speed, run, casting plan and yield and to produce castings having less internal defects with high efficiency by providing risers to the upper side faces of the cavities provided on the side faces of a casting mold and interposing stoppers between the risers and a pouring basin. CONSTITUTION:The risers 5 are provided in the upper side faces of the cavities 3 provided on at least one side faces 2a, 2b of the casting mold and the stoppers 8a are interposed between the risers 5 and the pouring basin 7. The molten metal in the pouring basin 7 is poured at the high pouring speed with good run into the cavities 3 when the stoppers 8a are simultaneously opened. There are no sprues, runners and gates and the casting plan and yield are remarkably improved. The rise of scum is made easy and the internal defects of the castings are decreased. The good castings are thus produced with high efficiency at a low cost.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to molds, and more specifically to thermosetting molds, gas set molds, and self-hardening molds, and is applicable to cast iron '1D products, cast steel castings, and non-ferrous metal castings. Used for casting, etc.

(Conventional technique t11) There is a mold as shown in Japanese Patent Publication No. 57-14251, in which a large number of molds 11 and 11 are arranged horizontally in a straight line as shown in Fig. 3. adjacent side surfaces 12a, 12b of adjacent molds 11, 1
A cavity 13 is formed between each cavity 13.1.
3 are provided with ingates 14.14, each ingate 1.14 communicates with a horizontal runner riser 15, the runner riser 15 is multi-! It is formed of a number of weirs 16, 16 and troughs 17, 17 that serve as risers.

(Problems to be Solved by the Invention) In this conventional mold 11.11, when molten metal is poured into the inlet of the runner riser 15, it flows into the first sump 17 and from there into the first inlet. It flows into the first cavity 3 through the gate 14 and fills the first cavity 13. When the first cavity 13 and the first sump 17 are filled, the molten metal flows over the next weir 16 into the second sump 17, passes through the second ingate 14, and enters the second gear 13. 17.17 and cavity 1 in the same way.
3.13 is filled, and the injection continues until the runner riser 15 is filled to 1 level, so there is a problem that it takes a long time to fill the cavity with molten metal7. The problem to be solved by the invention is to fill a large number of feeders and cavities with molten metal in a short period of time.

(Means for Solving the Problems) A means for solving the above problems is to provide a mold with a cavity on at least one side, a riser on the side surface above the cavity, and a riser and a cavity on the top surface. A hot water reservoir is provided which communicates with the boiler, and a stopper is further interposed between the hot water reservoir and the riser.

(effect) The above means works as follows.

When the stopper interposed between the pool and the riser is removed, the predetermined amount of molten metal that has been injected into the pool is simultaneously poured into each cavity at a high flow rate through each riser. The injection is continued until each riser is filled, and each riser and each cavity are integrally cast. Next, as the molten metal in each cavity cools and solidifies, the molten metal contracts, and the molten metal in each feeder is replenished into each cavity.

(Example) Hereinafter, an example showing a specific example of the means described in "2" will be described.

FIG. 1 shows a mold according to the present invention, which is made of shell sand, gas-set sand, and white hard sand.

A large number of 3b molds 1.1 are arranged horizontally in a straight line, a cavity 3 is formed between the adjacent side surfaces 28.2b of the adjacent molds 1, 1, and the upper end of each cavity, r 3.3 are provided with ingates 4, 4, and further above each cavity 3.3 are risers 5.4 communicating with each ingate 4.4.
5 is provided, each riser 5.5 is the upper surface 6.6 of the mold 1,
A rod-shaped stopper 8a, 8a is interposed between each feeder 5, 5 and the water reservoir 7, communicating with a water reservoir 7 provided in the feeder.

After pouring and filling the reservoir 7 with a predetermined amount of molten metal, when the stoppers 8a and 8a are removed, a high flow rate flows through each riser 5, 5 from each ingate 4, 4 to each cavity 3.3. At the same time, each riser 5.5 and each cavity 3.
3 are integrally cast. The molten metal in each cavity 3.3 then cools and contracts as it solidifies;
The hot water in each riser 5, 5 is in each cavity 3, 3.
3 will be given.

Another embodiment is shown in FIG. 2, with a stopper 8b.

It is formed in the same manner as in the previous embodiment except that 8b is formed from a metal lid, and has the same function as in the previous embodiment.

(Effect of the invention) The present invention produces the following effects.

A riser is provided on the side of the mold above the cavity, and a sump communicating with the riser and cavity is provided on the upper surface of the mold, so the 6'J opening and the passageway can be omitted, resulting in a marked improvement in the design yield and further improvement in design. Since it is simple and the cross-sectional area can be made small, Sb substances can be cleaned and the amount remaining in the weir can be kept small.

A pool communicating with the riser and the cavity is provided on the upper surface of the mold, and 78 hot water is once filled into the pool, so that the hot water scale floats to the top of the pool, thereby preventing scale defects.

Once the molten metal is injected into the pool and filled, the molten metal is simultaneously poured into each cavity through each riser, and each cavity C and each riser are integrally cast, so the injection speed of the molten metal is fast.
The hot water circulation is good, and there is no problem in each riser during solidification.
Since molten metal is replenished into each cavity, internal defects in the casting can be greatly reduced.

Since a large number of molds are arranged horizontally in a straight line, a large number of castings can be cast at one time, making pouring work more efficient and improving productivity.

Although the mold of the present invention can be made using green sand,
The dimensional accuracy of the casting is poor, and cutting edges are likely to occur.In contrast, the mold of the present invention uses shell sand, gas set sand,
Since the mold is made from self-hardening sand, mold matching is good, the dimensional accuracy of the casting is improved, and cutting edges are less likely to occur. In addition, since the core portion can also be molded into a circular part during molding, some cores can be discontinued.

4. Brief explanation of the drawings Figure 1 is a sectional view of a mold according to the present invention, Figure 2 is a sectional view of another JH type according to the invention, and Figure 3 is a sectional view of a conventional mold.

Claims (1)

[Claims] In a mold having a cavity formed on at least one side, a riser is provided on the side surface above the cavity, and a sump communicating with the riser and the cavity is provided on the upper surface,
Furthermore, the mold is characterized in that a stopper is interposed between the hot water pool and the riser.