JPH03234335A - Method for forming core for faucet - Google Patents

Abstract

PURPOSE:To manufacture cores for casting faucet, whose number of partings is drastically reduced, by inserting insert pattern at the prescribed angle to the parting direction in bisecting type forming mold and forming the prescribed part of the core of forming part at the end side thereof. CONSTITUTION:A cope 54 and a drag 56 are closed at a parting face 38 to form the forming mold 52, and by inserting the insert pattern 58, the forming part 59 thereof is protruded into a forming recessed part formed with the cope 54 and the drag 56. Under this condition, molding sand is blown into the forming mold 52 and hardened under heating to form the molding sand in the forming mold 52. At this time, the cores 10 are formed with this split face as the parting face 38 and annular gap 49 and slit-like recessed part 50 in a second part 14 of the core 10 are formed with the formed part 59 of insert pattern 58. When hardening of the molding sand is ended, the insert pattern 58 is pulled out in horizontal direction, and the cope 54 and the drag 56 are separated to take out the forming core 10 in the inner part. By this method, the second part 14 including a cylindrical gap 49 and a slit-like recessed part 50, is easily formed.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a method for molding a core for casting faucets.

(Prior Art) Generally, faucet fitting bodies are manufactured by casting, and at this time a core is used to create hollow parts such as water channels, runners, and mixing chambers.

Conventionally, this core has been molded by filling a two-part mold with molding sand and hardening it.

However, in the case of faucet fittings, the hollow parts such as water channels, runners, and mixing chambers have complex shapes and long lengths, so conventional molding methods using two-part molds are not suitable.
The entire core could not be molded as a single piece, so it was divided into multiple parts and each part was molded using a separate two-piece mold, and then each part was glued together with adhesive. It was used as one core.

(Problem to be solved by the invention) However, in this case, a plurality of molds are required for core molding, and a positioning tool is also used to define the relative position of each part when combining and bonding multiple parts. An adhesive type is required.

Further, since the curing time of the adhesive is usually about 20 minutes, it is necessary to prepare a plurality of such adhesive molds in order to improve workability.

It is possible to use instant adhesive, but in this case there is a problem that the adhesive hardens before each part of the core is aligned with the adhesive mold, making it unusable in practice. .

Furthermore, when each part of the core is bonded using adhesive in this way, the adhesive burns during casting of the faucet fitting and generates gas, which causes bubbles or leaks in the faucet fitting body. There was a problem.

Furthermore, even if each part of the core is positioned and glued using an adhesive mold as described above, it is inevitable that misalignment will occur between each part, and if such misalignment occurs, water When the plug body is cast, its wall thickness becomes uneven.

In addition, with this method, it takes a lot of time and effort to manufacture the core, and there is also the problem of mixing up the left and right parts and assembling them on opposite sides. Since a mold is required, there have been various problems such as the management of the mold, the storage of each part of the core, the management of the required number, etc., which becomes complicated and troublesome.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and its gist is to use a two-part mold, and fill the molding flask with molding sand. When molding a faucet casting core of a predetermined shape by troweling, a mold is inserted at a predetermined angle with respect to the dividing direction into the mold main body, which consists of a first mold and a second mold, which are separated from each other. is inserted, the molding part on the tip side projects into the molding recess, and the molding part molds a predetermined portion of the core.

(Operations and Effects of the Invention) As described above, the present invention is capable of inserting an insertion mold in a direction forming a predetermined angle with respect to the dividing direction of the mold, and molding a part of the core with the molding part on the tip side. In this way, it becomes possible to easily mold shaped parts 1, such as concave parts extending perpendicular to the dividing direction, which could not be molded using the conventional two-part force method, and the core can be molded into each part. The number of divisions can be significantly reduced, and in some cases it is also possible to mold the entire core as a single piece.

If the core can be integrally molded, the problems that have conventionally occurred can be solved all at once. In other words, whereas multiple molds were previously required for core molding, a single mold is now sufficient.6 Also, adhesive molds for adhering each part of the core are no longer required, and adhesives can be used for faucets. It also solves the problem of the metal fittings burning during casting and causing bubbles in faucet equipment.

It also eliminates the need for assembling each part of the core with adhesive, and eliminates mistakes such as confusing the right and left parts when assembling them. Furthermore, each part of the core was assembled with misalignment,
This eliminates the problem of uneven wall thickness when casting faucet fittings.

In addition, according to the method of the present invention, the time and effort required for core production are shortened, productivity is improved, and the time and effort required to manage core production molds and core storage locations is reduced. Various effects such as simplification occur.

(Example) Next, embodiments of the present invention will be described in detail based on the drawings.

In FIGS. 3 to 8, 10 is a core for casting the main body of a faucet, and as is particularly clear in FIGS. It has a portion 12 and a second portion 14 formed on the side thereof. The part 12 has rectangular portions 16° and 18 formed at its front and rear ends in the axial direction, and flanges 20 and 22 that are strip-shaped and have various widths between them.

24, 26, 27, 28, 30, 32 are formed to protrude outward in the radial direction. The brim portion 30 has a notch 34 at the upper portion in FIG. 3 (the lateral portion in the fourth FA).

A second part 14 formed laterally of the first part 12 has a side surface 36 passing through the narrow part of the first part 12 and a rectangular part 16.1.
The front and rear end surfaces 40 and 42 are perpendicular to the surface 38 that passes through the diagonal line of 8.
6 are respectively perpendicular surfaces.

This second part 14 is formed with three cylindrical protrusions 44, 46, 48 having an axis above the surface 38,
Further, an annular gap 49 is formed around the intermediate protrusion 46, and a slit-shaped concave portion 50 is formed so as to be continuous with the gap 49. The gap 49 and the concave portion 50 each extend in the horizontal direction in FIG. 3, that is, in a direction parallel to the surface 38.

FIGS. 1 and 2 show a method for molding this core IO. In these figures, reference numeral 52 denotes a mold, which has an upper mold 54 and a lower mold 56, and an insert 5! which is horizontally moved in and out of the mold body consisting of the upper mold 54 and the lower mold 56. It has 58. The mold body has the surface 38 in FIGS. 1 and 3 connected to the upper mold 54 and the lower mold 56.
It is configured as a dividing surface with a molded recess inside.

On the other hand, the insertion mold 58 consists of a base plate part 60 and a molding part 59, and the molding part 59 has a cylindrical part 62 having a shape corresponding to the annular gap 49 of the core 10, and a slit-shaped concave part. 50.

Next, a specific procedure for molding the core IO using this mold 52 will be explained.

First, the upper mold 54 and the lower mold 56 are closed, and the insertion mold 5 is closed.
8 is inserted and its molded part 59 is made to protrude into the molding recess formed by the upper mold and the lower mold. In this state, molding sand (resin coated sand) is blown into the mold and hardened under heating. That is, molding sand is molded within the mold 52. At this time, the core 10 is molded with the surface 38 as a parting surface (dividing surface), and the annular gap 49 and the slit-like concave portion 50 in the second portion 14 are molded by the molding portion 59 of the insertion mold 58. be done.

After the molding sand has hardened, the insertion mold 58 is pulled out horizontally, the upper mold 54 and the lower mold 56 are vertically separated, and the molding core lO inside is taken out.

In this way, according to the present method, it is possible to easily mold parts that could not be molded with a two-part mold, that is, the second part 14 including the cylindrical gap 49 and the slit-shaped concave portion 50. I can do it. Therefore, according to this method, there is no need to take the troublesome process of dividing the core lO into multiple parts, molding each part individually with separate molds, and then assembling them to integrate them. 1 core in one molding
0 can be integrally molded.

As a result, various problems that have conventionally occurred can be solved, and the product quality of faucet fittings can be improved, and production efficiency can be increased, among other excellent effects.

The above-mentioned core 10 is just an example, and
The present invention can be applied to the molding of cores of various other shapes, and the molding portion of the insertion mold may be configured into various shapes, or the horizontal direction may be changed depending on the shape of the core. The present invention can be implemented with various modifications based on the knowledge of those skilled in the art without departing from the spirit thereof, such as being able to insert the insertion mold into the mold body at other angles than the above. .

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the correspondence between the shape of an insertion mold and the shape of a core used in a method according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a method according to an embodiment of the present invention. 3 and 4 are perspective views of the core shown in FIGS. 1 and 2, viewed from different angles. 5, 6, 7 and 8 are a plan sectional view, a top view, a front view and a cross sectional view of the core, respectively. lO: Core 49 50: Concave portion 52 54: Upper 41! ! 5B 58: Insertion mold 59: Gap: Molding mold: Lower mold: Molding part

Claims (1)

[Claims] When using a two-part mold, the molding recess is filled with molding sand and then hardened to form a faucet casting core having a shape corresponding to the recess. An insertion mold is inserted into the mold main body consisting of a second mold at a predetermined angle with respect to the dividing direction, and the molding part on the distal end side protrudes into the molding recess, and the molding part forms a predetermined portion of the core. A method for molding a faucet casting core, characterized in that the core is molded.