JPS5861949A - Dry type spray molding device - Google Patents

Abstract

PURPOSE:To simplify the mixing mechanism of a spray gun provided with a feeding nozzle for binders and multivane type mixing mechanisms and to provide durability to said gun, by providing said gun in the part right under a main tank and attaching a blast hose to the preceding end part thereof. CONSTITUTION:A mixture of refractory particles, hardeners, etc. is charged from a hopper 1 to a specified volume supplying tank 12, a gate 2 is closed and compressed air A is blown. At the same time many rotary vanes 16 are revolved by the revolving shaft 17 of a spray gun 15 by a motor 14 to charge binders simultaneously through a feeding nozzle 19. In order to blow the mixed sand mixed with the gun 15 through a blast hose 5, compressed air B is blown from a booster 14, whereby facing sand materials are blown to the surface of patterns and facing sand layers are molded. Thus the mixing structure of the spray gun is simplified and the durability thereof is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a dry blow molding apparatus used for mold making.

The inventors of the present invention first put fl& mixture such as refractory particles and hardening material into a tank, and then used an injection gun to cross-wire, and during spray molding, the injection gun supplied a caking agent. (Japanese Patent Application No. 56-59691) has proposed a dry-type blowing equipment tube designed to avoid hardening of the mixed sand. This equipment is explained using Figures 1 and 2.
1, gate 02, tank OS, booster 04 with nine or more nozzles opened in the cutting direction on the inner wall surface, plast hose 05 and turbulence plate 07, caking material injection nozzle 08 and kneading mechanism 091! - The provision consists of nine injection guns 06. However, this equipment requires a large number of hours to maintain the injection gun, especially after spray molding. Is the statator mixer equipped with a spiral double-sided tube with a right-handed twist and a left-handed twist? It is very difficult to remove the kneading sand that adheres to the alternately arranged rounds.Furthermore, the static mixer (made of steel) has many drawbacks in wear resistance and wears out significantly.

This device is a fixed type, so if the passage is narrow, pull the injection gun at the end of the hose to the position of the actual model.
- Hose length 1100. The present invention has a total of nine features, including simplification and durability of the mixing structure of the injection gun, and employs a multi-blade type as the kneading mechanism.
If the passageway in the foundry is secured, it is more convenient to use a portable molding device that can be transported to the actual model mO position, so to suit this purpose, it is necessary to use a device that can be assembled compactly without taking up much space. A spray gun is installed directly below the main tank, and a plast hose is attached to the tip of the spray gun. , relates to a dry spray molding device that is equipped with a caking agent injection nozzle and a multi-blade crosstalk mechanism at the bottom of the tank, and has a spray gun consisting of a booster and a plastic hose attached to its tip. A structure of the dry spray molding apparatus of the present invention is shown in Section 5.4.5@. In addition, injection gun 150 detailed structure company No. 4, sg To)
, No. 5m is a cross section of FIG. A motor 14 that provides a power source for operating the injection gun 15, a plurality of knobblast hoses 5 opened in the inner wall surface, and directly connected to the motor 14*
A large number of rotary blades 14t are attached to one rotating shaft 17, and a caking agent injection nozzle tt is installed directly below the input port 15 to the injection gun 15.
A dry spray molding device consisting of an attached structure is used. still,
Both ends of the rotating shaft 17 to which the rotary blades 16t and 16p are attached are held by guide pens 18. Also, caking agent injection nozzle 1! The KFi spray nozzle at the tip is designed to inject the caking agent in the form of a mist.

Next, a spraying method using the apparatus of the present invention will be explained.

A mixture of refractory particles, hardening material, etc. is put into the quantitative supply tank 12 from the hopper 1, and then closed and compressed air is blown into the injection gun 15i motor 14.
Operate with and inject the caking agent into the nozzle 1! Inject at the same time.

Furthermore, compressed air Bl is blown from the booster 4 into the spray gun 15 and the kneaded sand is sprayed onto the model W'rM through the Pometo hose St. Spray on the model surface to make the skin even more eg-shaped. After that, set up a mold with a sand layer, a hot water path, etc. inside the metal frame, and use the back sand t=W! Fill the mold and release it to complete the molding.

In addition, when special sand (such as zircon sand) IP is used as a molding material, the skin sand layer is molded, and when silica sand is used, the Kti skin sand layer and back sand are molded at the same time. Because the device of the present invention is placed under the fixed-rate supply tank 12 of the spray gun 15i, if the total length of the plast hose 5 is 10 m or less, it can be applied to silkworms of 10 m or more. In this case, the injection speed R of the kneaded sand decreases significantly, and it is necessary to install a booster 4 for each within 10 sea breams.

Dry spraying of the present invention! The Il device provides the following effects.

(Li) It is a small spray gun, has a simple structure, and is easy to maintain after spraying.

(2) Since the injection gun has a multi-blade structure, it is possible to perform thorough mixing without uneven mixing. The visible time of the construction can be ignored, and therefore the building efficiency is the same as above, and a large cost reduction and labor saving can be achieved.

Specific examples of the skin sand materials used in the present invention are as follows.0 Skin sand materials (a) Fire-resistant particles: silica sand, zircon sand, chromite sand, alumina sand, etc.

(b) Caking material: Inorganic binding material such as water glass,
Organic caking agents such as furan resins O (c) Curing materials: Liquid curing materials or curing acceleration #0 suitable for caking materials. Table 1 shows curing materials and curing materials compatible with various caking materials. An example of a standard combination of accelerators is shown below.

Note) (1) Xylene sulfone m6 or para-toluene sulfonic acid) Addition amount O) Linocure casting certificate (4) Isokair casting example A device in which the dry spray sanding device shown in Fig. 3 is attached to the injection gun tube shown in Fig. 4 The test conditions used for spraying tests are as follows:
)) Caking #7 run resin (manufactured by Asahi Organic Industry Co., Ltd., type] 1P4000) - Viscosity lj 150ps / 25C φ) Wl-forming material Xylene sulfone II! (
Manufactured by Asahi Organic Industry Co., Ltd., Type P! -17) ・Viscosity 4Sa/25c (1) Hardening agent O, S/O/Viscosity added to refractory particles can be kneaded in a controlled kneading machine.

(2) Adjust the binder so that it can be injected with a metering pump against Log/sand.

5 Tongue capacity 2154 (Sand weight goo noodles 4 Injection gun The detailed structure is shown in Figure 4 (static mixer, made by Nippon Feeder) (1) Main dimensions Casing diameter 150 m Total length of kneading section 500 m (2) Motor 2-O1w Capacity 150147win Spraying conditions (1) Discharge rate 1 @ 04/win (Plast hose VK 52mm) (2) Spraying pressure Tang L OK11ffi", Booster & 5 noodles/cd (2) Spraying temperature Room temperature Spraying method is A mixture of refractory particles and hardening material was determined, and the distance between the outer circumference of the cylindrical model was adjusted to approximately 505W, and nine metal laths were placed on the surface of the cylindrical model (diameter t, ooo■, height 1.(1 (1Gmm)
), then spray with spray gun 7 under the above conditions.
Jirun skin sand layer of about Sow [Sesmade Maru. After that, install KjilL sand in the metal frame, runners, etc., fill it with silicic acid TM as backing sand, delaminate it, apply Jillsun-based finishing material, and make the casting.
t completed and mourning. Honcasting W! Casting test of steel (8046) at
However, there were no problems with the casting surface etc. (90)

[Brief explanation of the drawing]

FIG.
Figure 1 is a detailed view of the injection gas part in Figure 1, 69, @5
Figure 4 shows the jetting method in Figure 5! The IO detailed diagram shows the 5th diagram line 4.
Figure O of the kneading mechanism I-! - Arrow view of 〇Fuku Agent 1) Meifuku Agent 1R1K Ryo - Figure 1

Claims (1)

[Claims] There is a main tank that supplies and pumps a fixed amount of a mixture of refractory particles and hardening materials, and a caking agent injection nozzle at the bottom of the wrinkle tank.
A dry spray molding device equipped with a multi-blade cross-wire mechanism and consisting of a spray gun consisting of a booster and a plastic hose attached to its tip.