JPH0444292Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a wooden mold used for forming a mold, and in particular to a wooden mold for forming a mold suitable for casting cast iron posts such as car stops. It is something.

(Prior Art) Vehicle stops made of cast iron that are installed on sidewalks or the like to prevent vehicles from entering are well known.
The post-shaped items conventionally used for car stops are square prisms, but the molds used to cast them are split molds in which the square is divided into two by opposite sides.

However, since the conventional mold has a structure that uses two U-shaped cross sections, designs can be applied to the two front and rear sides, but designs cannot be applied to the two sides. This is because the left and right sides are parallel to the direction in which the wooden mold is pulled out when forming the mold.

On the other hand, Japanese Patent Laid-Open No. 56-99047 describes dividing a wooden mold into a plurality of parts and shaping the mold into a circular cross section. However, the conventional split mold as described in the same issue,
This merely shows the possibility of cutting the mold by dividing the mold. In fact, a cylindrical piece can be cast without any pattern if the surfaces on both sides of the square column are patternless joint surfaces. However, since the split molds are solid, they become heavy when casting large products, and it is difficult to fit the molds together.

(Technical Problem) The present invention was made with attention to the above-mentioned problem, and the problem is to create a mold that can be easily formed even with a mold for a triangular prism, and which can have an arbitrary design pattern on almost the entire surface. The purpose is to make it possible to shape it.

(Technical Means) In order to solve the above problems, the present invention has a substantially uniform cross-sectional shape that can be divided into three parts, and each of the three parts is divided into one wooden mold. In charge of placing the first wooden mold 1 in the part corresponding to the bottom of the triangle among the three parts, which is a wooden mold for forming a mold to form a design that will become the outer surface of the cast product,
The second and third wooden shapes 2,
3, the first, second, and third wooden molds 1, 2, and 3 form a hollow wooden mold, and the second, third wooden molds 2, and 3 are placed against the pressure during filling with molding sand. 3
In order to support this, an intermediate wooden mold 4 having a substantially T-shaped cross section is combined. It has a central support 4a that fits together, and a substrate 4b for supporting the other ends of the second and third wooden molds from the inside to maintain a constant cross-sectional shape, and the base plate 4b and the first wooden mold 1 A measure is taken to provide positioning means at the contact portions of both types. In this application, the term "approximately uniform cross-sectional shape" refers to a shape that is based on a uniform cross-sectional shape, but has deformed portions at key points, for example, as shown in FIG. 7.

(Function) According to the above configuration, a cast product having a substantially uniform cross-sectional shape is placed in the first, second, and third wooden molds 1, 2, and 3.
Since the mold can be cast using the following methods, the cutting die only needs to be considered in three directions, which simplifies the design of the wooden mold.

An intermediate wooden mold 4 is sandwiched between the second and third wooden molds 2 and 3 to support the second and third wooden molds 2 and 3 and resist the filling pressure of the casting sand, so that mold assembly is possible. ,
Separation can be performed easily and there is no risk of mold damage.

Further, the first to third wooden molds 1 to 3 may be plate-shaped, and are hollow when assembled, so they are lightweight relative to their size and easy to handle.

(Example) To explain with the illustrated example, the illustrated wooden pattern is 3
First, second, and third wooden molds 1, 2, and 3 and the second wooden mold 2 are used to form a mold for casting a prismatic car stop and have a design of three sides of a triangular prism.
and an intermediate wooden mold 4 located between the ends of the third wooden mold 3. The first wooden mold 1 gives the design to the bare sand 21 filled in the first casting flask 11, and the second wooden mold 2, the third wooden mold 3, and part of the intermediate wooden mold 4 are Casting flask 12
Each design is formed on the bare sand 22 that is filled in the sand 22.

Reference numeral 5 denotes a surface plate, which has a wooden frame receiving surface 5a for installing the first wooden mold 1, and is used when forming the second casting flask 12. At this time, the intermediate wooden mold 4 interposed between the adjacent ends of the second wooden mold 2 and the third wooden mold 3 is the support 4a.
and a substrate 4b that supports it, and the substrate 4b is accurately positioned by a dowel 6, which is a positioning means between the substrate 4b and the back surface of the first wooden mold 1. Middle wooden mold 4
has protruding engaging portions 7a, 7b on the left and right sides that allow the second and third wooden molds to be pulled out without moving them, and concave engaging portions that engage with these. 8a and 8b are formed at adjacent ends of the second wooden mold 2 and the third wooden mold 3, respectively, and these uneven engaging portions 7a, 8a, 7b, and 8b constitute an engaging means 9. Furthermore, the other ends 8c and 8d of the second and third wooden molds are connected to the stepped portions 7c and 7d formed by the left and right sides of the back surface of the first wooden mold and both ends of the intermediate wooden mold board, and the engagement means 9' having similar unevenness. It is engaged with.

The outer surfaces of the second wooden mold 2 and the third wooden mold 3 are designed to be an important element of this type of car stop. This design can be constructed using completely free shapes, structures, and patterns that depart from conventional common sense.
In other words, with the conventional U-shaped wooden mold, there was a restriction that it was not possible to implement a design with a direction or size that would get in the way when cutting the mold, but with the wooden mold assembly of the present invention, the first wooden mold 1 is Of course, the second wooden mold 2 and the third wooden mold 3 can be pulled out at right angles from the mold surfaces 1a, 2a, 3a formed on the casting sand 21, 22, and can be removed without parallel movement or diagonal displacement, which improves the design. There are no restrictions on the. Therefore, as shown in Figure 7,
A design D consisting of vertical stripes 31 parallel to the axial direction of the square column 30, horizontal stripes 32 perpendicular to the coaxial direction, diagonal stripes 33 that intersect diagonally, or a pattern 34 with no directionality at all is formed on the outer surface of the column. I can do it. In other words, it can be said that the intermediate wooden mold 4 is a member that secures a space for removing the second wooden mold 2 and the third wooden mold 3 from the mold surface in a direction perpendicular to the mold surface. According to the divided structure of the wooden mold in which the intermediate wooden mold 4 is interposed in this way, it is possible to form a mold surface with no design restrictions even on a square columnar shape, which has traditionally been the most common method. Similarly, any design can be applied to larger polygonal columnar or cylindrical objects.

In each figure, 13 is a lug for mold closing provided on the first flask 11, 14 is a lug similarly provided on the second flask 12, and a fastener 15 such as a bolt is connected to the first flask.
1. Used when closing the second flask 12.

The core 40 is formed by a wooden mold as shown in FIGS. 3 and 4. In the figure, 41 is the upper mold, 4
2 is a lower mold; 43 and 44 are a set of at least two positioning pieces protruding from the side surface of one mold toward the side surface of the other mold; and 45 are both positioning pieces 43 and 44.
An engaging piece that engages between the molds and is provided on the side surface of the other mold. Reference numeral 46 denotes a mold space, and 47 a core metal disposed at the center thereof, which has an opening 49 for venting gas from the molding sand 48 for the core.

In addition, 50 is a blade for holding the core, 51 is a weir,
52 is a runner, and 53 is a holding plate which is fixed to the flask lug 55 with bolts 54.

A mold is formed using the wooden mold of the present invention having the above configuration as follows. First, the first wooden mold 1 is installed on the fixed plate 5, and the intermediate wooden mold 4 is fixed with the dowels 6 with the substrate 4b in contact with the back surface of the first wooden mold 1. The other ends 8c and 8d of the mold 2 and the third wooden mold 3 are engaged, and the second wooden mold 2,
The other side of the third wooden mold 3 is connected to the respective engaging portions 8a, 8.
By engaging with the engaging parts 7a and 7b of the intermediate wooden mold 4 at b, the wooden mold is assembled on the fixed plate, the second casting flask 12 is placed and fixed on the fixed plate, and the molding sand and molding sand are assembled. to form one mold 10 (FIG. 1).

Next, one of the molds 10 is turned over, the fixed plate 5 is removed, the first mold flask 11 is covered and screwed, and the space between the first mold 1 and the inner surface of the flask is filled with sand and molding sand.
The other mold 20 is formed. The molds 10 and 20 are separated in order to remove each of the wooden molds 1 to 4. First, when the first wooden mold 1 and the intermediate wooden mold 4 are removed, the second wooden mold 2 and the third wooden mold 3 have room to move at right angles from the mold surface, so the second wooden mold 2 and the third wooden mold 3 are removed. Wooden mold 3 to mold surface 2
It can be removed without affecting a and 3a in any way. Both molds 10 and 20 are now completed. Therefore, since the first to third wooden molds 1 to 3 are removed at right angles from the respective mold surfaces 1a to 3a, molds with a free and subtle design are formed on the bare sand of the mold surfaces.

In order to cast a triangular prism-shaped wheel stop using this mold, the two completed molds 10 and 20 are combined, the core 40 is set inside and closed (Fig. 5), and the weir 5
molten metal is poured between the first and second molds 10, 20 and the core 40, and the molds are released after cooling.

(Effects) Therefore, according to the present invention, it is possible to suitably form a wooden mold for casting a cast product such as a triangular prism shape whose mold surface can be divided into three parts, and to form a mold having a shape constituting the mold design.
There are no restrictions on patterns, etc., making it easier to design triangular or cylindrical wooden molds that were extremely difficult to implement with conventional wooden molds, and making it easy to assemble and disassemble the wooden molds.
There is no risk of damage to the mold, and since it is hollow, it is lightweight relative to its size and is easy to handle, providing remarkable practical effects.

[Brief explanation of drawings]

The drawings show an embodiment of the wooden mold for forming a mold according to the present invention, and FIGS. 1 and 2 are cross-sectional views of the wooden mold together with two mold forming procedures, and FIG. 3 is a cross-sectional view of the wooden mold for forming a core. Figure 4 is a side view of the mold, Figure 4 is a cross-sectional view, Figure 5 is a vertical cross-sectional view of the assembled mold, Figure 6 is a cross-sectional view, Figure 7 is a cross-sectional view, and Figure 6 is a cross-sectional view of the assembled mold.
Figure 8 is a front view of the triangular prism-shaped car stop obtained by the present invention, and Figure 8 is a plan view. 1...First wooden pattern, 2...Second wooden pattern, 3...Third pattern
Wooden mold, 4... Middle wooden mold, 11... First casting flask, 12
...Second casting flask.

Claims (1)

[Scope of claims for utility model registration] (1) Has a substantially uniform cross-sectional shape, and the cross-sectional shape is 3
A wooden mold for forming a mold that has a shape that can be divided into parts, and one wooden mold is in charge of each of the three parts to form a design that will become the outer surface of a cast product,
Of the three parts, the first wooden mold 1 is placed in the part corresponding to the base of the triangle, and the second and third wooden molds 2 and 3 are placed in the part corresponding to the oblique side of the triangle. The first, second, and third wooden molds 1, 2, and 3 form a hollow wooden mold, and the cross section is approximately T-shaped to support the second and third wooden molds 2, 3 against the pressure during filling with molding sand. The intermediate wooden mold 4 is sandwiched between the ends where the second and third wooden molds 2 and 3 meet, and has a central support 4a that engages with the intermediate wooden mold 4 so that it can be pulled out inward. , a substrate 4b for supporting the other ends of the second and third wooden molds from the inside to maintain a constant cross-sectional shape, and a means for positioning the substrate 4b and the first wooden mold 1 by contacting the two molds. A wooden mold for forming a mold, characterized by having a mold formed in the section. (2) The plurality of wooden molds have a mold pattern that is designed to be removable only by movement in a direction substantially perpendicular to the surface of the formed mold.
A wooden mold for forming a mold as described in section.