JPH05277635A - Method for removing sand in cold box molding machine - Google Patents

Abstract

PURPOSE:To execute change of the arrangement in short time by blowing original sand for kneaded sand into a blow head at the time of completing the molding work, replacing the kneaded sand remained in a blow chamber and a blow nozzle into the original sand and therefore, idle-blowing the air into the blow head. CONSTITUTION:At the time of completing the prescribed molding work, a cope 6 is ascended in the condition of fitting the blow head 1, and a removal sand flask 8 is fitted between the cope 6 and a drag 7. The original sand S before mixing of the resin in the kneaded sand used to the molding is blown from a blow head 1. The blown original sand S is passed through the blow chamber 2, etc., and while scraping the remained kneaded sand, this sand is passed through the cope 6 and the recessed part in the removal sand flask 8 and discharged out of the mold from a sand discharging pipe 8c. The kneaded sand mixing the resin used to the mold has large angle of repose and bad sand removal property, but by blowing the original sand, the kneaded sand remained in the blow head, etc., can be replaced into the original sand. This original sand is blown off by idle-blowing the air and automatically dropped and discharged from the removal sand flask to out of the flask.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sand removing method for removing kneading sand remaining in a blower at the time of setup change such as die change of a cold box molding machine.

[0002]

2. Description of the Related Art At the time of setup change such as die change of a cold box molding machine for molding a cold box core into a molding die, kneading sand in which sand is mixed with phenol resin and polyisocyanate is molded. Conventionally, the blow plate of the kneading sand blowing device is cleaned in the following manner.
As shown in FIG. 3, first, the lock 5 of the blow head 1 removed from the molding die is released, and the blow plate 3 is taken out of the molding machine. Next, the worker 10 manually scrapes off the sand on the blow plate 3. Next, the worker 10
Rides on the blow plate 3 and uses the air tool 11 to clean the inside of the blow nozzle 4 and discharge the residual sand R. 1
2 is an air hose for an air tool.

Residual sand R of kneading sand is attached to the corner 2a of the blow chamber 2 of the blow head 1 shown in FIG.
Japanese Utility Model Laid-Open No. 63-25237 discloses a cold box molding blow chamber in which an air nozzle is installed at a corner of the blow chamber in order to prevent the kneaded sand from staying. In Japanese Utility Model Laid-Open No. 63-76343, a jig plate for filling the corner of the blow chamber 2 of the blow head 1 is installed to prevent the kneading sand from staying in the corner. Blow chambers for cold box molding are described.

[0004]

In the conventional method for cleaning the blow plate and the blow nozzle, the worker rides on the blow plate and is carried out by the air tool, so that residual sand scatters and gets into the eyes. The work is difficult and time consuming due to manual work, which results in a long setup change time and reduced productivity.
In addition, the residual sand discharged by the air tool scatters around and deteriorates the working environment. Both of the above-mentioned publications prevent the residual sand from accumulating in the blow chamber, and do not disclose anything about cleaning the residual sand of the blow plate and the blow nozzle. The present invention solves the above-mentioned problems, and by using a mold for exclusive use of sand discharge, it is possible to automatically discharge the residual sand of the blow nozzle without manually cleaning it and improve the productivity. It is intended.

[0005]

According to the present invention, when performing a setup change after molding using kneading sand, a sand discharging mold is directly or movable on a blow head with a blow plate having a blow nozzle attached. Cold box molding type in which the raw sand of the kneading sand is blown into the blow head to replace the kneading sand remaining in the blow chamber and the blow nozzle with the raw sand, and then air is blown to the blow head. This is the method for removing sand from the machine.

[0006]

The kneading sand mixed with the resin used for molding has a large angle of repose and poor sand removal property. However, by blowing the raw sand not mixed with the resin, the residual sand in the blow head and the blow nozzle is removed. Since it has been replaced by raw sand with good sand removal properties, this raw sand is blown away by the air blow and is automatically dropped, and is discharged from the sand discharging mold to the outside of the mold.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention will be described with reference to the drawings. FIG. 1 is an explanatory diagram of an embodiment of the present invention. In FIG. 1, a blow head 1 has a blow chamber 2 formed therein, and a blow plate 3 having a large number of blow nozzles 4 is attached to a lower surface of the blow head 1 by a lock 5. The blow nozzle 4 of the blow plate 3 is mounted on the blow nozzle receiver 6a of the upper die 6 which is a movable die of the molding die. At the time of molding, clamp the upper mold 6 and the lower mold 7,
Blow head 1 to blow nozzle 4 of blow plate 3
After that, kneading sand is cast into the mold cavities 6a and 7a. If the embedding tool 2a formed in the same shape as when the kneaded sand stays is installed in the corner of the blow chamber 2 of the blow head 1, the remaining sand in the blow chamber 2 can be effectively prevented from staying.

A dedicated sand discharging mold 8 to be installed between the upper and lower molds 6 and 7 at the time of changeover is separately prepared. The sand discharging mold 8 has its upper and lower surfaces closely contacting the parting surfaces of the upper and lower molds, and has a concave portion 8b formed on the upper surface in accordance with the cavity 6a of the upper mold 6 for collecting sand, and along the bottom surface 8b of the concave portion. Sand removal pipe 8
c is provided on the side of the sand discharging type.

Next, the setup change using the sand discharging mold will be described. First, when a predetermined molding operation of molding the kneading sand into the cavities of the upper and lower molds 6 and 7 is completed, the upper mold 6 is lifted with the blow head 1 attached, and as shown in the figure, the sand discharging mold 8 Is attached between the upper and lower dies 6 and 7. Next, the raw sand S before mixing the resin of the kneading sand used for molding is blown from the blow head 1. The raw sand S blown in is
Blow chamber 2, blow plate 3, blow nozzle 4
Through the recesses of the upper mold 6 and the sand discharging mold 8 while scraping out the kneading sand accumulated in these parts, and discharging it from the sand discharging pipe 8c to the outside of the mold. The kneading sand mixed with the resin used for molding has a large angle of repose and poor sand removal property, but remains in the blow head 1 and the blow nozzle 4 by blowing raw sand not mixed with the resin. It is possible to replace the kneading sand with raw sand that has good sand removal properties. Next, the lock 5 is removed, the blow head 1 is raised, and the raw sand remaining on the blow plate 3 is discharged. This work can be automated by scraping out the remaining sand on the blow plate 3 using a cylinder or the like. Further, by providing the padding 2a as described above at the corner of the blow chamber 2, it is possible to prevent the residual sand in the blow chamber 2 from accumulating. Next, the blow head 1 is lowered and attached to the blow plate 3, and air is blown into the blow head 1. Since the residual sand in the blow nozzle 4 is replaced with the raw sand having a good sand-removing property, it is blown off by the air blow and is automatically dropped, and is discharged from the sand discharging pipe 8c of the sand discharging mold 8 to the outside of the mold.

Another embodiment of the sand discharging type used in the present invention is shown in FIG. The sand discharging mold 9 of this embodiment is the blow plate 3
The lock 5 is directly attached to the lower surface of the recess, and a recess 9a for receiving the blow nozzle 4 is formed, and a sand discharging pipe 9c is provided at the bottom of the recess. This sand removal type 9
In the setup change using, the blow head 1 with the blow plate 3 still attached is removed from the upper die 6, and the sand discharging die 9 is directly attached to the lower surface of the blow plate 3. In the state of FIG. 2, the raw sand S is blown from the blow head 1, the residual kneading sand in the blow chamber 2, the upper surface of the blow plate 3 and the blow nozzle 4 is replaced with the raw sand, and the upper surface of the blow plate 3 is cleaned. The point that the inside of the blow nozzle 4 is cleaned by the air blowing is the same as that described above with reference to FIG.

As described above, the equipment of the conventional molding machine can be used as it is for the installation and the air-blowing of the sand discharging mold only by separately preparing the mold for the sand discharging, and the resin is used for the replacement of the kneading sand. Since the raw sand for kneading sand before mixing is used, it is not necessary to separately prepare a special material for cleaning. Further, the cleaning of the blow nozzle can be automated, and the setup change can be efficiently performed without danger. Further, when the blow nozzle is cleaned, the sand is not scattered and the working environment can be kept good.

[0012]

According to the method of the present invention, a setup change can be performed in a short time with a small equipment investment, productivity is improved, and there is little danger in work, and a good work environment can be maintained.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a method of the present invention.

FIG. 2 is an explanatory view of another method of the present invention.

FIG. 3 is an explanatory diagram of a conventional method.

[Explanation of symbols]

1 Blow Head 2 Blow Chamber 3 Blow Plate 4 Blow Nozzle 5 Lock 6 Upper Die 7 Lower Die 8 Sand Discharge Type 9 Sand Discharge Type S Raw Sand

Claims (1)

[Claims] 1. A kneading process in which a sand discharging mold is attached directly or through a movable upper mold to a blow head with a blow plate having a blow nozzle attached, when performing setup change after molding using kneading sand. After blowing the raw sand of the sand into the blow head to replace the kneading sand remaining in the blow chamber and the blow nozzle with the raw sand, air is blown to the blow head to remove the cold box molding machine. Sand method.