JP2879114B2 - Parquet back plate and mold molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) A parquet structure back plate and a method of molding a mold according to the present invention provide a back plate for molding a small amount of various sand molds while saving sand, and molding using the back plate. To a molding method.

(Prior Art) Conventionally, in a mold molding method of molding using a back plate, a back plate having a shape in consideration of a relationship between a model and a mold is manufactured, and one back plate is manufactured for each model.

(Problems to be Solved by the Invention) In the above-mentioned conventional back plate and the molding method using the same, one back plate has to be manufactured for each model.

Further, when a back plate is not used, a large amount of molding sand for a mold is required, and particularly, molding sand prepared by a cold box method is expensive, and there is a problem in that regeneration is expensive.

Therefore, there is a problem that it is desired to easily mold a small amount of various kinds of sand molds in a shape that saves molding sand.

(Means for Solving the Problems) The parquet structure back plate and the mold molding method of the present invention have been invented in order to solve the above problems, and the specific invention has a cross section of an equilateral triangle and a regular shape. A plurality of back metal rods having the same cross-sectional shape of either a square or a regular hexagon, a back metal rod for forming a gate and a runner, a back metal rod for forming a casting sand injection port, a vent, and a feeder component And a parquet structure characterized by forming a mold-molding pattern by forming a mold-molding pattern with a space for a model and a mold-molding, with all the patterns in the mold having a groove matching the outer shape of the back metal inside. It is a plate.

Further, the first related invention relates to a back metal rod having a cross section of any one of a regular triangle, a square or a regular hexagon, and a plurality of back metal rods having the same cross-sectional shape, a back metal rod for forming an inlet, and a back metal inside. A parquet structure back plate characterized in that a mold molding pattern is formed by focusing on all patterns in a mold having a groove conforming to an outer shape, and forming a mold and a space for mold molding.

Further, the second related invention relates to a method in which a soft rubber or plastic having a thickness of a sand mold serving as a mold is placed on a model placed on a surface plate inside a mold having a groove matching the outer shape of the back metal inside. A sheet is placed, and a plurality of back metal rods having the same cross-sectional shape with a cross section of any one of a regular triangle, a square or a regular hexagon, a back metal rod for a gate and a runner, and a casting sand injection port are placed thereon. Constituent back metal rods, vents, and feeder components are converged and set on all patterns in the formwork, and the equilateral triangle, square or hexagonal back metal rods and a plurality of them, After fixing the back metal rod for the gate and the runner, the back metal rod for the casting sand injection port, the vent, and the feeder component to the formwork and removing the soft rubber or plastic sheet, Soft rubber Others by blowing the molding sand into a space remains which plastic sheet is detached, a mold molding method, characterized in that to solidify.

Further, a third related invention relates to a method in which a soft rubber or plastic having a thickness of a sand mold serving as a mold is placed on a model placed on a surface plate inside a mold having a groove matching the outer shape of the back metal inside. Place a sheet on it, and put a plurality of back metal rods of the same cross-sectional shape with a cross section of any one of a regular triangle, a square or a regular hexagon, and a back metal rod for forming a casting sand injection port in the form Focus on all patterns and set,
A plurality of the above-mentioned equilateral triangle, regular square or regular hexagonal back metal rods and a back metal rod for forming a casting sand injection port were fixed to a mold, and the above soft rubber or plastic sheet was removed. A molding method is characterized in that casting sand is blown into a space where the soft rubber or plastic spacing plate has come off, and then solidified.

(Function and Example) FIG. 2 is a plan view of FIG. 1 and FIG.
As shown in the figure, a model (2) is placed on a surface plate (1) also serving as a bottom of a mold, and is surrounded by a mold (3) having a groove (4) on the inner side that matches the outer shape of the back metal.

On this model (2), a soft rubber or plastic sheet (5) having a thickness of a sand mold serving as a mold is placed almost along with the model.

A back metal rod (6) having a cross section of any one of an equilateral triangle, a square and a regular hexagon and having the same cross-sectional shape, a back metal rod (7) for forming a sprue and a runner, a casting sand injection port The back metal rod (8), the vent (9) and the back metal rod (10) for the component part of the feeder component are bundled and set in the mold (3) in the entire pattern without any missing portions. Here, to set and converge on all patterns means that the inside of the mold (3) is composed of a unit back metal rod (6), a back metal rod (7) for a spout and a runner,
An empty space filled with any of the back metal rods (8) and vents (9) for the casting sand injection port and the back metal rods (10) for the component part of the feeder component is not filled. Means no. The gap based on the bar manufacturing error between the respective back metal bars does not mean the above-mentioned space.

In this case, for example, when a back metal bar having a regular hexagonal cross section is used, the back metal bar of each unit must be a regular hexagonal back metal bar having the same sectional shape. In addition, the outer shape of the back metal rod for forming the sprue and runner, the back metal rod for forming the casting sand injection port, the vent, and the back metal rod for the constituent part of the feeder component are obtained by bundling a plurality of unit back metal rods. Must be the same as the cross-sectional trajectory.

In this way, a plurality of back metal rods (6) having the same cross-sectional shape in which the cross section is any one of a regular triangle, a square or a hexagon, and a back metal rod (8) for forming a casting sand injection port. Is fixed to a formwork, and after removing the soft rubber or plastic sheet (5), molding sand is blown into the space where the soft rubber or plastic sheet (5) has come off and solidified. The desired sand mold is formed.

When the mold is a split mold divided into an upper mold and a lower mold, the lower mold has a back metal rod (7), a vent (9), and a back metal rod (10) for configuring a feeder component in the lower mold. If) is not necessary, these are omitted and only the back metal rod (8) for forming the casting sand injection port is focused.

The required cross section is any of a regular triangle, a regular square or a regular hexagon, and a back metal rod (6) having the same sectional shape.
Each of a back metal rod (7) for forming a gate and a runner, a back metal rod (8) for forming a casting sand injection port, a vent (9), and a back metal rod (10) for forming a part of a feeder are formed into a mold. (3) In the case where the bundle is set and fixed in the inside, one of the back metal bars (6) having the same cross-sectional shape is made into a tapered back metal bar, and is driven in for tightening.

Replace the back metal bar at the place where it is likely to come off,
Replace with the tapered back metal bar and drive. Later, when pulling out for disassembly, apply a punch-like tool to the tapered thin surface and hit it off easily with a hammer.

In FIG. 2, when the upper blow plate surface is flattened, the height when the back metal bar is converged is substantially aligned, and the upper and lower sides are turned upside down to be aligned with the blow plate surface on the blow plate. A pressing member (11) for pressing the back metal rod is provided on the inner surface of the formwork (3) as shown in FIG. (11) Formwork (3)
The back metal bar may be fixed by moving with a pressing bolt (12) provided on the back. Note that the fixing structure is not limited to this, and a cam may be used instead of the bolt, or the form itself, which is hinged, may expand and contract.

When the upper blow plate surface is flattened, there are places where the space into which sand is blown becomes large.

Further, as shown in FIG. 4, the back metal rod for forming the sprue and the runner, the back metal rod for forming the casting sand injection port, the vent, and the feeder component are a sprue, a runner, a vent,
It may be composed of a casting sand injection port or a feeder and a back metal rod having an outer shape matching this.

The length of the back metal rod of the unit may be of various lengths, but if a cover is provided on the upper side of the mold, it may be possible to deal with the same length depending on the shape of the mold. Many.

If a magnet is embedded in the end face of the back metal rod for the spout and the runner, in addition to the unit back metal rod, it is convenient to converge these.

When a unit back metal bar with a regular hexagonal cross section is used, it is convenient to use a diagonal line with a length of 25 mm and a length of 5 mm, according to the practical situation.

(Effect of the Invention) According to the parquet structure back plate of the present invention, and according to the mold molding method of the present invention, a back plate having a shape in consideration of the relationship between the model and the mold is conventionally provided for each model. It does not need to be manufactured one by one, and it saves molding sand for molds, and thus, it is not necessary to reclaim expensive molding sand such as prepared sand of cold box method. , Small amount of various sand molds easily,
In addition, there is an advantage that molding can be performed in a shape in which casting sand is saved, and the present invention has an extremely large contribution to industrial development.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a parquet structure back plate of the present invention, FIG. 2 is a longitudinal sectional view of an embodiment of the parquet structure back plate of the present invention taken along line AA in FIG. 1, FIG. Fig. 4 is an explanatory view of a structure for converging and fixing a back metal rod, and Fig. 4 is another embodiment of a back metal rod for forming a gate and a runner, a back metal rod for forming a casting sand injection port, a vent, and a feeder component. It is a top view of an example. 1 ... surface plate; 2 ... model; 3 ... formwork; 4 ... groove; 5 ... sheet; 6 ... back metal rod; 7 ... back metal rod for spout and runner configuration; 9 ... Vent; 10 ... Back metal rod for the feeder component; 11 ... Pressing member; 12 ... Pressing bolt.

Claims (4)

(57) [Claims] 1. A back metal rod having a cross section of any one of a regular triangle, a regular square or a regular hexagon and having the same sectional shape, a back metal rod for forming a gate and a runner, and a casting sand injection port. Back metal rods, vents, and riser components are focused on all the patterns in the mold that have grooves inside that match the outer shape of the back metal, and a mold and pattern are formed with a space for the mold and the mold. Parquet structure back plate characterized by forming. 2. A back metal rod having a cross section of any one of a regular triangle, a regular square or a regular hexagon and having the same cross-sectional shape, a plurality of back metal rods for forming an inlet, and an inner shape conforming to an outer shape of the back metal. A parquet structure back plate characterized in that a mold molding pattern is formed by converging all patterns in a mold having grooves to be formed and leaving a space for a mold and a mold. 3. A soft rubber or plastic sheet having a thickness of a sand mold serving as a mold is placed on a model placed on a surface plate inside a mold having a groove matching the outer shape of the back metal inside. A plurality of back metal rods of the same cross-sectional shape with an equilateral triangle, square or hexagonal cross section, a back metal rod for gate and runner construction, and a back metal rod for casting sand inlet , Vents, and feeder components are bundled and set in all patterns in the formwork,
A plurality of the above-described equilateral triangle, square or hexagonal back metal rods, a back metal rod for a gate and a runner configuration, a back metal rod for a casting sand injection port configuration, a vent, and a feeder component After fixing the soft rubber or plastic sheet to the formwork and removing the soft rubber or plastic sheet, molding sand is blown into the space where the soft rubber or plastic sheet has come off to solidify it. Law. 4. A soft rubber or plastic sheet having a thickness of a sand mold as a mold is placed on a model placed on a surface plate inside a mold having a groove matching the outer shape of the back metal inside. A plurality of back metal rods of the same cross-sectional shape with a cross section of any one of a regular triangle, a square or a regular hexagon, and a back metal rod for forming a casting sand injection port are focused on all patterns in the mold. And set the equilateral triangle above,
After fixing a plurality of square metal or hexagonal back metal rods and a back metal rod for forming a casting sand injection port to a mold, and removing the soft rubber or plastic sheet, the soft rubber Alternatively, a molding method characterized by injecting molding sand into a space where a plastic sheet has come off to solidify it.