JPS59166351A - Spray molding device - Google Patents

Abstract

PURPOSE:To automate spraying and packing operations and to improve molding workability by spraying a mold forming material for facing sand in the forward moving stage of a spraying pipe and a mold forming material for backing sand to the opening of a molding flask. CONSTITUTION:A granular material and a binder material are mixed in a mixing device 1 to form a mold forming material for facing sand. A granular material and a binder are mixed in a mixer 2 as well to form a mold forming material for backing sand. The formed mold forming material for facing sand arrives at a spraying pipe 14a, and is sprayed through the opening of a molding flask 22 onto the surface of a pattern 20, by which a facing sand layer is sprayed and packed onto the surface of the pattern 20. A forward and backward driving device 13 is driven reverse to move backward a spraying pipe 14b in an arrow B direction to feed forcibly the mold forming material for backing formed similarly by the mixer 2 so that said material is sprayed and packed onto the facing sand layer. When the casting mold provided with the facing sand layer and the backing sand layer is formed by spraying and packing, the flask 22 is conveyed to the succeeding stage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spray molding apparatus that sprays and fills a mold forming material, which is a mixture of a particulate material and a binder material, onto a model.

Conventionally, a mold forming material made by mixing a particulate material such as silica sand and a binder material such as a caking agent or a hardening agent using a mixing device is pumped by pressure gas through a conveying conduit, and is then placed on a predetermined model surface. A spray molding method has been devised in which an inorganic or organic self-hardening mold is formed by spray filling. In the conventional spray molding equipment used for such spray molding method,
The worker holds the tip of a flexible conveying conduit (plast hose) in his hand and sprays the material onto the surface of the model, but this conveying conduit is fleeting.

This has the problem of being heavy and requiring a large amount of labor on the part of the operator. In addition, it is generally preferable to form a skin sand layer with high packing density on the surface of the model, and to form a backing sand layer on top of that, but in the conventional apparatus described above, another problem is that it is difficult to change the skin sand layer and the backing sand layer quickly. It also had some problems.

The present invention solves the problems of the above-mentioned conventional spray molding device,
We have achieved labor savings by automating the spray filling work (molding work), greatly improving the productivity and workability of the molding work, and quickly forming the skin sand layer and backing sand layer to create high-quality molds. The purpose of the present invention is to provide a blow molding device that can be used for manufacturing.

That is, the present invention provides a mixing device that mixes a particulate material and a binder material to form a mold and produce a material, and a pressure gas injection mechanism that is disposed near an outlet of the mixing device and injects pressurized gas. , a blowing pipe provided subsequent to the pressure gas injection mechanism and having a plurality of blowing openings facing the opening of the formwork, and a reciprocating drive device for reciprocating the blowing pipe above the formwork. When the spray tube moves forward, the mold forming material for the skin sand is sprayed, and when it moves backward, the mold forming material for the back sand is sprayed from the spray opening toward the opening of the mold. The present invention relates to a spray molding device characterized by the following.

The accompanying drawings show an embodiment of the apparatus of the present invention, in which FIG. 1 is a plan view, FIG. 2 is a view along the line 1--2 in FIG. 1, and FIG. 3 is a longitudinal sectional side view of the main part.

In FIG. 1, 1. The main device is a mixing device It that produces a mold forming material by mixing particulate materials such as silica sand and binder materials such as caking agents and hardening agents. Since these mixing devices 1.2 each produce a mold forming material for back sand and have the same configuration, only the configuration of the mixing device 1 for mold forming material for back sand will be described below.

A mixing trough 3 of the mixing device 1 is disposed on a pedestal 4 extending substantially horizontally, and within the mixing trough 6 is a mixing blade or paddle (not shown) rotatable via a rotational drive source 5 such as a motor. is accommodated. jAlso, mixing trough 3
is provided with a supply port 6 for particulate material, and
A binder material feed lower, 8, is provided. Furthermore, a pressure gas injector fg10 is arranged near the discharge port at the tip of the mixing trough 3 via a connecting flange 9. This pressure gas injection mechanism 1°0 has a configuration commonly known as a booster, and this has an annular slit opened toward the outlet in the funnel-shaped peripheral wall of the mixing trough. It is designed to inject pressurized gas such as compressed air from the

11 is a connection 7 flange 12 following the pressure gas injection mechanism 10
This conveyance conduit 11 is connected via the conveyance conduit 11.
is made of a flexible member, and its tip end is connected to the spray tube 14a via a reciprocating drive device 13 via a connecting flange 15 (see FIG. 3). This spray pipe 14a is for spraying the mold forming material for skin sand mixed by the mixing device y, and is constructed in the same manner as this spray pipe 14a. Spraying pipes 14b for spraying sand mold forming material are arranged in parallel.

The spray pipe 14a has a plurality of spray openings 15 that open downward.
a, and its terminal end is sealed by an end plate 16a (see FIG. 3). It is desirable to change the aperture ratio of the spray opening 15a as appropriate to enable uniform spray filling.

The reciprocating drive device 13 is mounted on a horizontal member 18 of a gate-shaped support frame 17, as shown in FIG.
4b is installed. This reciprocating drive device 13 is mainly composed of a servo motor, etc., and the blowing pipe 14a
.

14b is reciprocated. Spray pipes 14a, 14
Below b, a mold 22 mounted on a model surface plate 21 with a model 20 can be conveyed on a conveying device 23 such as a roller conveyor.

In the apparatus of the present invention configured as described above, the model 2
The model surface plate 21 with a 0-shaped mold and the molded frame 22 are conveyed on a conveying device 23 and stopped at a predetermined position directly below the spray pipes 14a and 14b. On the other hand, the rotational drive source 5 of the mixing device 1
is driven to rotate the mixing blade or paddle, and a certain amount of particulate material is sequentially supplied into the mixing trough 3 from the supply port 6, and further binder materials such as caking agent and hardening material are fed into the lower, 8 into the mixing trough 3 where these particulate materials and binder material are mixed to form a mold forming material for the skin sand.

Also, in the mixing device 2, the particulate material and the binder material are mixed in the same manner as described above to produce a mold forming material for sand. The mold forming material for skin sand produced as above is sent to the discharge port at the tip of the mixing trough 3, where it is accelerated by the pressure gas injected from the pressure gas injection mechanism 10, and is transferred to the conveyance guide W11. It is forced to reach the spray pipe 14aK, and is sprayed all at once from the opening of the mold 22 onto the surface of the model 200 via the plurality of spray openings 15a of the spray pipe 14a.

Simultaneously with the start of spraying of the mold forming material for skin sand, the reciprocating drive device 13 is driven to move the spray tube 14a forward in the direction of the arrow M, and the surface of the model 20 is sprayed and filled with a layer of pressure sand F8. In this way, the reciprocating drive device 13 moves forward and the blowing tube 14
When a reaches the forward movement end (as shown in FIGS. 1 and 2), the injection of pressurized gas from the pressurized gas injection mechanism 10 is stopped to complete the spraying and filling of the mold forming material for skin sand. Note that it is preferable to spray a mold release agent or the like onto the surface of the model 20 during forward movement of the reciprocating drive device 13, and then spray and fill with the sand magazine mold forming material.

As described above, a sand layer 11' is formed on the surface of the patterned W20O.
After S is formed, the mold forming material for backing sand produced by mixing device R2K is fed under pressure in the same manner as above, and
41) to spray fill onto the surface sand layer ys. In this case &:j: drive the forward drive device a13 in reverse and
While b is moved back in the direction of the arrow B, the backing sand mold forming material is sprayed and filled to form the backing sand layer BS. Reciprocating drive device 1
3 moves backward and the blowing pipe 141) reaches the backward moving end, the injection of pressurized gas is stopped and the blowing light 1f of the mold forming material for back sand is emitted.
Afr: Completed.

In this way, when the mold with the skin sand layer PB1 and the back sand layer Bg is spray-filled, the mold 22 is transported to the next process on the transport device 23, while the next mold 22 is sent. The above operations are repeated υ.

The spray tubes 14a and 14b may be configured to be movable up and down so that the spray distance can be adjusted depending on the type of model 20, etc.

According to the present invention described in detail above, the following effects can be achieved.

■ By automating the spray filling work (molding work), it is possible to achieve labor savings in the foundry and to significantly improve the productivity and workability of the molding work.

■ A high-quality ship shape can be manufactured by quickly forming a skin sand layer and a backing sand layer.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the device of the present invention, and FIG.
The figure is a view taken along the line ■-■ of Figure 1, and Figure 3 is a vertical sectional side view of the main part of Figure 1. 12...Mixing equipment 10...Pressure gas injection mechanism 13...Reciprocating drive device 141L, 14b"--Blowing pipe 22...Formwork agent Inside a+ Meifuku agent Ryo Hagiwara -

Claims (1)

[Claims] In a spray molding device that sprays and fills a mold forming material made by mixing a particulate material and a binder material into a mold frame in which a model is attached, the particulate material and a binder material are mixed to form a mold forming material. a pressurized gas injection mechanism that is disposed near an outlet of the mixing device and injects pressurized gas;
A blowing pipe provided at the rear of the pressure gas injection mechanism and having a plurality of blowing openings facing the opening of the formwork, and a reciprocating drive device for reciprocating the blowing pipe with respect to the opening of the formwork. In addition, when the spray pipe moves forward, the mold forming material for the skin sand is sprayed, and when the spray pipe moves backward, the mold forming material for the back sand is sprayed from the spray opening toward the opening of the mold. A spray molding device featuring: