JP2561370Y2 - Sand mold for hottie combined with gate - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sand mold for a hot-water bath system which also serves as a gate.

[0002]

2. Description of the Related Art A conventional sand mold that is also used as a gate and a feeder is known as:
It is disclosed in JP-A-1-224139. Compared to a mold sand mold in which the gate and the feeder are separated, the mold does not require a gate system, so the yield of molten metal is improved,
Further, it is advantageous because it reduces the cost and weight of the mold production. In addition, a core with a sleeve, that is, a ceramic filter with a sleeve is interposed in the internal passage of the pouring / feeding port so as to perform the filtration and the feeding of the hot water. It is.

[0003]

However, the above-mentioned conventional sand mold which also functions as a gate and a feeder is a ceramic filter with a sleeve, so that its filtering performance is not only inferior to that of a mesh filter but also that of the feeder. Combined with the large diameter of the dual-purpose opening, it is difficult to divide the post-cast product with a hammer along the boundary surface between the product and the solidifying portion of the riser. Therefore, in an attempt, instead of the ceramic filter, for example,
Figure reticulated filter central opening surface disclosed in JP-B-47-14631 3, good urchin embedded support of FIG. 2 shows
And tried to traverse installation used該兼for the mouth of the previously refractory metallic ring or a refractory sleeve and tensioned, Yu圧falling during infusion hot water, as shown, the該兼for mouth Since the entire surface of the reticulated filter stretched over substantially the entire cross section, the reticulated filter bends downwardly due to the impact, and as a result, the cast product having reduced filtration performance and obtained by breaking. resulted in problems such as fracture surface of that becomes a defective product which dented. In this case, it was found that it was necessary to study and study that the filtration performance and pouring performance at the time of pouring were suitable for practical use from the viewpoint of the breaking performance, in terms of the relaxation of the impact of the molten metal on the mesh filter and the porosity. Was. As described above, it is desirable to solve the above-mentioned conventional inconveniences and to develop a gate mold and a feeder-type sand mold suitable for the above-mentioned practical use.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a sand mold for a gate and a feeder which satisfies the above-mentioned demands. In the hot water type sand mold, along the interface between the dual-purpose port and the space for product casting therebelow, the porosity is in the range of 20 to 35%.
The outer periphery of the heat-resistant net, which is
With a flat surface over a large area supported by the inner periphery of the building
Sexual annular plate, in the path of the sprue combined opening, the sprue KenHiraku
Project a flat surface that is large inward from the mouth and has a wide area
And filtering the heat-resistant net in a small area at the center.
It consists of intersecting so that the surface is located .

[0005]

[Action] The flat plate surface having a large area of the refractory-made annular plate allowed across intervening so as to increase projecting into the passage of the sprue combined opening Rutotomoni, a small filtration surface of the heat-resistant net body 該湯
Since the molten metal is positioned at the center of the dual-purpose mouth , when the molten metal is poured from the dual-purpose mouth, most of the molten metal that falls falls on the wide flat surface of the refractory annular plate, and the net Is reduced, so that the hot water pressure applied to the net extending in the center thereof is reduced, thereby preventing the net from bending downward. After casting, the annular plate is squeezed and a small-diameter boundary portion with a central mesh interposed therebetween is formed, so that the breaking force by the hammer is small and the cutting along the mesh filter is easily performed. be able to.

In this case, when the porosity of the net is in the range of 20 to 35%, the net itself also has an improved impact resistance during pouring, is not bent or deformed, and maintains a flat state. As a result, the product is divided along a flat surface along the surface, so that a cast product without defects is secured, while the filtering performance is improved and a good riser effect is exhibited.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows an embodiment of the present invention. 1 in the drawing
Represents a gate mold sander mold that also serves as a gate, and the mold 1 has a predetermined cross-sectional area on the upper surface, and has a rectangular or circular cross-section,
Alternate opening the pouring and feeder having a water passage extending in the vertical direction (hereinafter
Referred to as the lower combined port portion) 2 and the lower surface of the combined opening 2, is provided with a product casting space 3 which communicates therewith.

According to the present invention, the dual-purpose opening 2 and the space 3
Along the boundary surface, the central opening of the small surface area, the outer peripheral portion of the heat-resistant net 4 stretched at the inner peripheral edge thereof is held in a buried state and has a large diameter of a fire-resistant square or circular shape . The annular plate 5 is attached to the
The filtration surface of the heat-resistant net 4 in a small area in the center of the passage
And the outer periphery of the annular plate 5
Annular plate 5 having a flat surface of the surface region is transverse sectional allowed <br/> tighten so as to intervene. In the illustrated example, the lower end of the mold peripheral wall surrounding the dual-purpose opening 2 is formed on an upwardly inclined annular installation surface 6, and a downward annular inclined surface formed on the outer periphery of the annular plate 5 is installed on the upper surface thereof. Then, if necessary, they were bound via an adhesive.
Although not shown in the drawings, the outer peripheral edge of the annular plate 5 may be embedded and fixed in the sand mold at the time of manufacturing the mold. It is preferable that the inner peripheral edge of the annular plate 5 has a wedge-shaped cross section 8 having a sharp tip as shown in the figure.

The mesh is made of a woven fabric made of heat-resistant fiber such as glass fiber or carbon fiber and having a predetermined porosity and opening. In particular, glass fibers containing 75% by weight or more of SiO ₂ having heat resistance to the molten metal of the high melting point metal are preferable, and those having a SiO ₂ content of 95% or more are particularly preferable. The refractory annular plate is formed by molding molding sand with a hardening agent such as resin or water glass.

Further, as an example, the above-mentioned filtering and feeding member which is used in the present invention will be described in detail.
It is made of high silicate glass fiber containing 99% of O ₂ , and is made of three horizontal weaves and phenol resin to give shape-retaining properties. Its dimensions are 37 mm × 42 mm, shell sand (coated sand) hardened with phenol resin. Large area flat consisting of
The refractory annular plate 5 having a surface is a circle having an outer diameter of 140 mm, the central opening of a small surface area for burying and supporting the net body 4 is square, and the size is 37 × 42 mm. Is stretched in a state where the outer peripheral edge of the square net 4 is buried,
It forms a 37 × 42 mm filter and feeder surface. Normal,
His eyes open dimension is the 0.4mm ² ~4mm ^2. or,
The thickness is set to 1.0 to 1.4 mm in consideration of impact resistance. When the thickness is less than 1.0 mm, the strength of the net is insufficient, and when it exceeds 1.4 mm, it is difficult to manufacture and process the net and it is difficult to cut the molten metal after casting, which is not preferable.

[0011] The above-mentioned dual-purpose feeder-type sand mold equipped with the device of the present invention can be obtained by injecting molten metal from the dual-purpose port 2.
Most of the molten metal corresponds to the flat surface of the large area of the annular plate 5 protruding largely into the passage of the opening 2 below, and the molten metal with respect to the filtering and feeding surface of the mesh body 4 stretched at the central opening. The impact when falling is alleviated. Therefore, the net body 4 is prevented from curving downward due to hot water pressure, and is a small surface area thereof.
In addition to this, the horizontal stretching state is maintained, so that a predetermined excellent filtering action is performed. The filtered molten metal fills the product casting space 3, and the high-temperature molten metal is further poured, so that the molten metal as a feeder is filled in the dual-purpose opening 2 above the mesh body 4. be able to.

The feeder in this case is different from a mold in which a conventional gate and a feeder are separately provided, and is a molten metal having the same highest temperature as the molten metal poured from the conventional gate. Tests and examinations have shown that the diameter of the mouth 2 can exert a feeder effect even if the diameter is smaller than before, and based on this finding, the diameter of the combined mouth is squeezed by the annular plate 5 to a small diameter. In addition, even if the opening ratio of the mesh body 4 stretched at the central opening is extremely reduced, the feeder effect is exhibited, and at the same time, the filtration performance for separating impurities such as slag in the molten metal is significantly improved. Further, after the casting, the cast product portion was separated from the small-diameter boundary solidified portion having the mesh body interposed therebetween, so that the hammer could be easily and horizontally broken.

Next, the relationship between the porosity of the mesh and the filterability, impact resistance, and riser effect by pouring as well as the breakability after casting were examined. On the other hand, for comparison, for a mold provided with a conventional gate and a feeder part separately, a net-like filter is provided at the gate, and the same net is replaced and installed over the entire large diameter of the mouth of the feeder part, A similar comparative test was performed.

The casting conditions are as follows: molten material FCD-50
0, casting temperature 1370 ° C, casting weight 60Kg, casting time 5
７7 seconds, followed by a 3.6 kg hammer rupture. The test results are shown in Table 1 below.

[0015]

[Table 1]

The filterability indicates the number of color spots as a result of a penetrant test (color check) performed after breaking the riser and polishing the upper surface of the cast product by 2 mm. Regarding the impact resistance, regarding the deformation of the net due to the impact at the time of pouring, those that did not deform are indicated by a circle, those that were slightly deformed are indicated by a triangle, and those that were deformed are indicated by a cross.

As is clear from Table 1 above, it was found that in the mold of the present invention, the filtration performance, impact resistance and breakability were good in the range of the porosity of the mesh body of 20 to 35%. In particular, the feeder effect was exhibited even when the hole opening ratio was as small as 35% or less and 20%. On the other hand, in the case of a mold having a separate gate, when a net body was attached to the feeder portion, the feeder was used. It was found that the effect could not be exhibited unless the opening ratio was 40% or more, and as a result, there was a disadvantage that the breakability was lowered. Also, the ratio
In the mold of the comparative example, if the porosity is 35% or less,
There was no sinkhole and no good feeder effect was obtained.

If necessary, as shown in the figure, by providing a refractory sleeve 9 covering the inner surface of the mold peripheral wall surrounding the dual-purpose port 2 on the upper surface of the annular plate 5, the high temperature of the molten metal is poured. The temperature of the riser may be maintained. The refractory sleeve is a molded article of a ceramic material, a particulate refractory material such as silica sand, or a molded article of a heat-insulating refractory material containing a refractory fiber, and may contain a heat generating material. The refractory annular plate and the refractory sleeve may be integrally formed in advance.

[0019]

As described above, according to the present invention, the boundary between the dual-purpose port and the product casting space is provided in a gate / feeder-type sand mold having a port that also functions as a gate and a riser. Aperture ratio 20 to 3 stretched along the surface and at the central opening of the small surface area
Heat resistant with large area flat surface with 5% net
A flexible annular plate is placed in the passage of
In addition to positioning the filtration and riser surface of the net in the area,
Insert the flat surface of the large surface area of the refractory annular plate on the outer periphery
So that most of the molten metal during pouring is received by the large flat surface of the annular plate,
Can allowed to relax the attack, it is possible to prevent deformation due Yu圧of said network element, good filterability and feeder operates in a horizontal state
Resulted in use, after casting, since the network of small surface area boundary portion was squeezed by this and the annular plate of the large surface area between the pressing hot part and the cast product is interposed, said by hammer disruption of the boundary portion is easily and flat obtained excellent filtering performance during pouring as a whole, and and to mitigate the impact resistance of the mesh member, and products and feeder unit after casting the filtration riser effect parallel Can be very easily and accurately broken along the boundary surface, and also has an effect of providing a high quality product.

[Brief description of the drawings]

FIG. 1 is a sectional view of a mold according to an embodiment of the present invention;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Mold 2 Spouting hole as well as pouring water 3 Manufacturing casting space 4 Netting 5 Refractory annular plate 9 Refractory sleeve

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-293938 (JP, A) JP-A-49-43826 (JP, A) JP-B-47-14631 (JP, B1)

Claims (1)

(57) [Scope of request for utility model registration] 1. A sand mold having a spout and a feeder, which is provided with a spout which serves both as a pouring gate and a feeder, wherein a small surface area is formed along a boundary between the dual-use spout and a product casting space therebelow. in the range of hole area ratio from 20 to 35%, which is stretched over the central opening is a refractory-made annular plate the outer peripheral portion of the heat-resistant net member having a flat surface of the large surface area that is retained, the該兼for the mouth of the In the middle of the passage ,
In addition to locating the filtration and riser surface of the heat-resistant net in the area
The flat surface of the large surface area of the annular plate intervenes on its outer periphery.
In addition, a sand mold that is also used as a gate and is also installed horizontally.