JPS61108449A - Deflashing method of core - Google Patents

Abstract

PURPOSE:To remove a flash without roughening the surface of a cold box core in deflashing or said core by dropping by gravity glass particles having a specific grain size and specific gravity to the core at a specific fall. CONSTITUTION:The glass particles having 0.5-3mm grain size and 1-5 specific gravity in a reservoir chamber 7 are scooped up by a bucket elevator 8 and are supplied to a hopper 1. On the other hand, the core 4 is ejected by passing right under a dropping port 2 of the hopper 1 as a turntable turns. The glass particles are dropped by gravity through the dropping port 2 onto the core 4 at 10-100cm fall in the stage of passing right under the port 2. The glass particles remove the flash of the core 4 and pass through wire nets 6, 9 together with the sand-like flash and arrive at the chamber 7 through a chute 5. the flash pass through a wire net 10 and is stored in a sand reservoir 11. The glass particles remain on the net 10 and are reused.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION INDUSTRIAL APPLICATION FIELD OF THE INVENTION The present invention relates to an improvement in a method for removing core flags used in casting.

Conventional technology In the past, various studies have been conducted on methods to automatically remove blemishes that occur on the core along the mating surfaces of the molds during core molding.
There are few highly effective practical methods, and no method has been found that is particularly versatile and suitable for high-mix, low-volume production.

Therefore, the inventor of the present invention conducted research to find something particularly suitable for high-variety, low-volume production, and projected one particle onto a core.

Because the method for removing core burrs is highly versatile, we conducted experiments using two different types of particles, and found rice and polypropylene as particles suitable for removing burrs from cores, and filed patent applications for each. No. 55-119'060 (Special Publication No. 59-12381) and Patent Application No. 10702-1982
The application was filed under No. 8.

Problems to be Solved by the Invention However, the method of projecting rice or polypropylene as described above does not have an effective deburring effect on shell cores in which phenol resin is mixed into sand as a binder and then heated and baked after molding. However, cold box cores manufactured by mixing polyurethane as a binder into sand and curing it with triethylamine gas after molding had the problem of surface roughness.

This is because cold box cores have lower surface strength than shell cores, and the strength of the burr area is not much different than shell cores.

This is because when rice or polypropylene is projected with the projection energy necessary for deburring, roughness occurs on the surface of the core.

Means for Solving the Constituent Problems of the Invention The inventors of the present invention conducted further experiments and discovered a method of removing burrs by allowing glass particles to fall naturally toward the cold box core. Namely.

The gist of the present invention is that in cold box core removal, 9 grain sizes are 0.5! II ~ 6 many insults, specific gravity 1
．． 0 to 5.0 glass particles at 10 crrL to 100 cI
There is a method for removing core embossments, characterized in that the core embossments are removed by allowing the core to fall naturally onto the core with a head of rL.

According to the present invention, the glass particles that have fallen onto the core move downward as if rolling on the surface of the core and rub against the tie portion, thereby removing the burrs.

Embodiment Two embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The drawing is a schematic diagram of an apparatus for carrying out the method of the invention.

In the figure, 1 is a hopper having a drop port 2 at the bottom.

3 is located below the drop port 2 and rotates to sequentially move the part of the bottom wire mesh 6 located directly below the drop port. The turntable is carried out to the next process after passing directly under 2.

5 is a chute that opens below the turntable 3 and collects glass particles falling from the drop port 2 of the hopper 1; 7 is a reservoir where the glass particles that have passed through the chute 5 accumulate; 8 is a reservoir 7
Hopper 3 repeatedly pumps up the glass particles accumulated inside.
This is a packet elevator that supplies the inside of the building.

Note that the wire mesh 9 provided at the upper opening of the chute 6 and the wire mesh at the bottom 4 of the turntable 3 are made with a mesh that allows glass particles to pass through sufficiently and prevent the core from falling.
Ru. Further, a wire mesh 10 is provided at the bottom of the reservoir chamber 7 to allow casting sand to pass through but not glass particles.
1 is provided.

According to the above configuration, the glass particles accumulated in the storage chamber 7 are pumped up by the bucket elevator 8 and repeatedly supplied to the hopper 1, and the glass particles are temporarily stored in the hopper 1, but the glass particles are removed from the droplet 2. It falls one after another, passes through the wire meshes 6 and 9, enters the chute 5, and returns to the reservoir chamber 7. Since the above action is repeated, the drop port 2
A certain amount of glass particles always fall from the

On the other hand, the core 4 is carried into the turntable 3 by a feeder device (not shown), passes directly under the drop port 2 as the turntable 30 rotates, and is then carried out. At this time, the core 4 is deburred from the glass particle trap falling from the drop opening 2. In other words, the glass particles directly collide with the burrs of the core 4, or once they hit the core surface, they move downward as if rolling on the core surface, and act on the burrs to remove the burrs. It is something. Furthermore, since the fallen glass particles roll on the surface of the core, they are less likely to cause rough skin. The debris removed by the glass particles becomes sand and reaches the storage chamber 7 together with the glass particles, but is separated from the glass particles by the wire mesh 10 and stored in the sand storage 11.

Note that the glass particles have a specific gravity of 251 and a particle size of 1.21+m to 1.
5 dragon, and the head difference between drop opening 2 and core 4 is 25 cIrL.
It is.

When the glass particles were dropped onto the core 4 with the above-mentioned height, the scratches were completely removed and the surface of the core was in good condition without any roughness.

The grain size was set to 0.5mm to 3mm, but if it was less than 0.5m+i, the grains would be too small and burrs could not be removed sufficiently.

If the temperature exceeds 0.7°C, the grains are too large, damage the skin of the core, and make it impossible to remove small blemishes.

In addition, the specific gravity was set from 1 to 5, but if it is less than 1, the impact when falling is too small and it is not possible to remove burrs sufficiently, and if it exceeds 5, the effect of roughening of the skin due to the difference in head is too large for practical use. It is not suitable for

In addition, the head was set to 10 to 100, but if it was less than 10α, burrs could not be removed sufficiently.

If the length exceeds 100 cm, rough skin will occur on the core.

As described above with the embodiments, according to the present invention,
This method is extremely effective in practical use because it can remove burrs without causing roughness on the surface of Cold Bonx cores, which were not sufficiently effective with the conventional method of projecting rice or polypropylene. It has excellent effects.

3... Turntable, 4... Core.

5. Shoot, 7. Storage room.

8...Packet elevator

Claims (1)

[Claims] In deburring cold box cores, particle size is 0.5
10 glass particles of mm to 3 mm and specific gravity of 1.0 to 5.0
A method for removing burrs from a core, characterized by removing burrs from the core by allowing the core to fall naturally at a height of 100 cm to 100 cm.