JPS63144852A - Horizontal casting device - Google Patents

Abstract

PURPOSE:To prevent deformation of a casting and generation of defects therein by providing a sprue collar to the top end of an injection sleeve, mounting a flow divider to a moving mold and disposing the pool of a solidified layer between the sprue collar and and the flow divider. CONSTITUTION:The sprue collar 56 is fitted into the top end part of the through-hole 52 of a fixed mold 32 in contact with the injection sleeve 66 and the flow divider 80 is disposed in a recess 75 of the moving mold body 44. A cavity 46 is delineated and the sprue collar 56 fits to the flow divider 80 when the moving mold 34 is moved and is brought into tight contact with the mold 32. The molten metal part where an oxide film is generated on the surface is first stored in the pool 86 of the solidified layer when a molten metal 90 is poured into a sleeve 60 in this stage. After the pool 86 is filled with the molten metal 90, the molten metals 90 subjected to removal of impurities is supplied into the cavity 46. Since the molten contg. half-solidified components and impurities is removed, the deformation of the casting and the generation of the defects therein are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a horizontal casting apparatus, and more particularly, when molten metal is injected from a horizontally oriented injection sleeve into a cavity defined by a mold, a solidified layer pool is formed at the runner entrance. By forming a molten metal, impurities such as a semi-solidified film and oxides mixed in the molten metal at the start of the casting process are allowed to flow into the solidified layer reservoir and contained, and only the molten metal without impurities is introduced into the cavity to improve quality. The present invention relates to a horizontal casting device configured to obtain good quality cast products.

Casting equipment has been widely used to produce products of the same shape in large quantities in a short period of time. A horizontal casting apparatus according to this prior art is shown in FIGS. 1 and 2. That is, in FIG. 1, reference numeral 2 indicates a conventional horizontal casting apparatus, in which molten metal 10 is injected into an opening 8 inside an injection sleeve 6 through a pouring spout 4, and a plunger 1
2 to move the molten metal 10 to the runner entrance 14 and the runner 1.
6 into the cavity 18. Cavity 18
Then, after a predetermined period of time has elapsed, the molten metal solidifies and the desired product is obtained.

However, at the start of the casting process, as shown in FIG.
Since the injection sleeve 6 is cylindrical, its cross section has a substantially semicircular shape.

The molten metal 10 starts to be cooled by the wall of the injection sleeve 6 from the moment it is poured into the opening 8. That is, the contact surface between the molten metal 10 and the inner surface of the injection sleeve 6 is cooled down to a semi-solid state due to the temperature difference between the two. Subsequently, by driving the plunger 12, the molten metal 10, which is in a semi-solidified state and has an oxide film formed by contact with air, passes through the runner inlet 14 and enters the cavity 1.
8 is press-fitted. As a result, problems have been pointed out, such as the occurrence of casting defects such as hot spots and wrinkles in the cast products.

The present invention has been made to overcome the above-mentioned disadvantages, and includes forming a coagulated layer reservoir so as to communicate with a runner that leads the molten metal to be press-fitted into the cavity by driving a plunger, and When pressing, impurities such as semi-solidified films and oxides generated and mixed in the molten metal flow into the solidified layer reservoir, thereby removing impurities and introducing only high quality molten metal into the cavity. The object of the present invention is to provide a horizontal casting device that makes it possible to obtain cast products free of casting defects.

In order to achieve the above object, the present invention involves extruding the molten metal in an injection sleeve horizontally oriented in a fixed mold by a plunger, through a runner defined by the fixed mold and the movable mold. A horizontal casting device that obtains a desired cast product by press-fitting and filling a cavity, the horizontal casting device comprising:
A sprue collar is disposed at the tip of the injection sleeve, a shunt is attached to a movable mold, and the movable mold is displaced relative to the fixed mold to fit the shunt to the sprue collar. The molten metal is characterized in that it defines a runner which communicates the inside of the sleeve with the cavity, and forms a coagulated layer reservoir in which a part of the molten metal is stored between the sprue collar and the flow divider.

Next, preferred embodiments of the horizontal casting apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

In FIGS. 3 to 6, reference numeral 30 indicates a horizontal casting apparatus according to the present invention. The horizontal casting apparatus 30 basically includes a fixed mold section 32, a movable mold section 34, and a hot water supply means 36 provided in the fixed mold section 32. The fixed mold section 32 is mainly composed of a fixed mold base 38 and a fixed mold body 40. On the other hand, the movable mold section 34 is composed of a movable mold base 42 and a movable mold body 44.

Therefore, when the movable mold part 34 is driven toward the fixed mold part 32 and the fixed mold body 40 and the movable mold body 44 are brought into close contact with each other, the cavity 46 is formed by the convex and concave portions defined in both. is formed.

Next, the hot water supply means 36 will be explained. That is, a stepped through-hole 50 is formed by integrally penetrating the fixed mold base 38 and the fixed mold main body 40 in the horizontal direction, and the stepped through-hole 50 has a diameter-enlarged tip and a tail end. A sprue collar 56 having a flange portion is fitted. In this case, the flange portion engages with a step portion 48 formed on the fixed mold body 40. A substantially truncated conical hole 58 is formed at the tip of the sprue collar 56, and this hole 58 is formed in the sprue collar 56.
It has reached the tail end of. Further, rectangular convex portions 62a and 62b extend in the axial direction of the wall defining the substantially truncated conical hole 58 formed in the sprue collar 56 (see FIG. 4). reference).

Therefore, a passage 63 is defined between the protrusions 62a and 62b.

Further, a cylinder 64 is fitted into the remaining portion of the stepped through hole 50, a sleeve 66 is further fitted into the cylinder 64, and a plunger 68 is slidably fitted to the sleeve 66. The plunger 68 is moved to the sleeve 6 by a drive source (not shown) via a push rod 70.
It is possible to make a sliding displacement within 6. Moreover, the pouring lower 4 is formed in the cylinder 64 and the sleeve 66.

On the other hand, as shown in FIGS. 3 and 4, a recess 75 is defined in the movable mold body 44 so as to face the opening of the sprue collar 56, and flow is diverted into this substantially cylindrical recess 75. Child 80 is fitted. The flow divider 80 includes a cylindrical portion 76 and a truncated cone portion 78, and a recess 82 is formed at the end of the cylindrical portion 76.

Therefore, by engaging the fixed mold body 40 and the movable mold body 44, as shown in FIG.
The shunt 80 is fitted into the flow divider 80 . As a result, the passage 63 of the sprue collar 56 and the recess 82 defined in the flow divider 80 communicate with each other. Form 84.

That is, the convex portions 62a, 62b are in liquid-tight contact with the truncated cone portion 78 of the flow divider 80, and a narrow runner 84 is defined, as well as the sprue collar 56 defined by the convex portions 62a, 62b. The space between the truncated cone portion 78 is a coagulated layer reservoir 86
(See Figure 5). Note that an extrusion pin (not shown) for extruding a cast product from the mold is installed inside the movable mold section 34.

The horizontal casting apparatus according to the present invention is basically constructed as described above, and its operation and effects will be explained next.

When the movable mold part 34 is moved toward the fixed mold part 32 under the action of a drive source (not shown), the fixed mold body 40 and the movable mold body 44 come into close contact, and a cavity 46 is defined. At the same time, the flow divider 80 is fitted into the sprue collar 56.

After the above preparation steps, the hot water pouring lower 4 of the hot water supply means 36 is completed.
Then, molten metal 90 is poured into the sleeve 66.

In order for the plunger 68 to maintain its exit position, the poured molten metal 90 flows toward the sprue collar 56 . That is, the high-temperature molten metal is cooled by coming into contact with the inner wall of the sleeve 66, and its surface becomes semi-solidified, and an oxide film is generated at the portion in contact with the atmosphere.

Next, the push rod 70 is driven by a drive source (not shown).
The plunger 68 is driven through the sleeve 66 to press the molten metal 90 stored in the sleeve 66. As a result, as shown in FIG. 6, the molten metal 90 is pushed toward the sprue collar 56 by the driving action of the plunger 68, and gradually flows into the solidified layer reservoir 86 inside the sprue collar 56 from its tip.

That is, the molten metal in a semi-solidified state or the molten metal containing an oxide film is stored in the solidified layer reservoir 86. In this manner, after the coagulation layer reservoir 86 is filled with the molten metal 90, subsequent molten metal free of impurities is led to the runner 84 and supplied to the cavity 46. At the same time, gas such as air inside the cavity 46 is led out to the outside through a gas vent hole formed in the fixed mold body 40, and then the gas vent hole is closed to the cavity 46 by a closing pin (not shown) as a screen. communication is cut off. Furthermore, the plunger 68 is pressed and biased via the push rod 70 under the driving action of a drive source (not shown) of the hot water supply means 36, and the molten metal 90 is held under pressure for a certain period of time. Therefore, the molten metal 90 injected into the cavity 46 is cooled, and after a certain period of time, the molten metal 90 is completely solidified to obtain a cast product.

According to the present invention, in the horizontal casting apparatus, the molten metal poured into the sleeve from the spout has a cross section on the inner surface of the sleeve that flows from directly below the spout in one direction according to the amount of molten metal poured into the sleeve. The fluid becomes a corresponding approximately semicircular shape. At this time, the molten metal that flows the longest from the spout, that is, the tip of the molten metal that is closest to the sprue collar, has the longest period of contact with the inner wall of the sleeve, so that it is in the most advanced state of solidification. Therefore, in this horizontal casting device, by driving the plunger, the tip of the solidified molten metal is introduced into the solidified layer reservoir and contained therein, and the subsequent molten metal that has not solidified and has few impurities enters the cavity through the runner. Fill. In other words, by preventing the molten metal containing impurities such as semi-solid components and oxide films from flowing into the cavity, deformation and cracking of the cast product can be avoided. It is also possible to avoid the occurrence of casting defects. Furthermore, when pressing the molten metal, the transmittance of the pressing force is improved, and the flowability of the molten metal is also improved, and as a result, it is possible to obtain a cast quality product with high density.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design can be made without departing from the gist of the present invention. Of course.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a conventional horizontal casting device after pouring molten metal, and Fig. 2 is a partially omitted longitudinal cross-section of the cylinder portion of the horizontal casting device shown in Fig. 1, taken along line n-n. Fig. 3 is a vertical cross-sectional view showing a state in which molten metal is completely poured into the horizontal casting device according to the present invention, and Fig. 4 is an exploded view showing the shape of the sprue collar and flow divider of the horizontal casting device according to the present invention. FIG. 5 is a partially omitted vertical sectional view taken along the line V-V showing the sprue collar and flow divider in FIG. 3, and FIG. 6 shows a state in which the cavity of the horizontal casting device according to the present invention is filled with molten metal. FIG. 30...Horizontal casting device 40...Fixed mold body 44...Movable mold body 46...Cavity 56...Gate collar 80...Buncher 84...Run runner 86... Solidified layer reservoir 90...molten metal

Claims (1)

[Claims] (1) By extruding the molten metal from an injection sleeve provided in a horizontal direction on a fixed mold using a plunger and press-fitting it through a runner into a cavity defined by the fixed mold and the movable mold. A horizontal casting device for obtaining a desired cast product, in which a sprue collar is disposed at the tip of the injection sleeve, a flow splitter is attached to the movable mold, and the movable mold is moved relative to the fixed mold. A solidified layer reservoir that fits a splitter into the sprue collar by displacement to define a runner that communicates the inside of the sleeve and the cavity, and stores a portion of the molten metal between the sprue collar and the shunt. A horizontal casting device characterized in that it is configured to form.