JPH0739475Y2 - Blow nozzle for core molding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a core forming blow nozzle that can be used both as a blow nozzle and an exhaust vent.

2. Description of the Related Art A conventional core molding blow nozzle will be described with reference to FIGS. 6 and 7. The core molding blow nozzle 1'connects the cavity 15 formed in the mold and the blow head 8 leading to the sand supply source to blow the sand together with the air. The sand introduction is open at both end surfaces of the hollow cylinder. The mouth 2 and the sand discharge port 3 communicate with each other to form a blow passage 4. The sand introduction port 2 side is inserted into one of many connection ports of the blow head 8 that is provided so as to be compatible with various molds, and the sand discharge port 3 side at the other end is inserted through the packing 6 into the mold 7. It is inserted into the blow nozzle insertion port.

When the core is molded using the above-mentioned core molding blow nozzle 1 ′, the sand fed together with the air from the sand supply source enters the sand introduction port 2 from each connection port of the blow head 8,
The sand is discharged from the sand discharge port 3 into the cavity 15 through the blow passage 4, and only the air is discharged from the exhaust vent 16 provided with the slit valve in the cavity, and the remaining sand becomes the core.

Problems to be Solved by the Invention By the way, when mounting the exhaust vent, the position and the number are determined in consideration of the degree of sand entrainment in the cavity that differs depending on the shape of the core to be molded. When making a model, the surrounding of sand may be insufficient. In order to improve this, it is effective to add an exhaust vent to the part where sand wraparound is insufficient, and even if the blow nozzle insertion port on the mold side is used as an exhaust vent, it should be returned to the mold manufacturing factory. It was necessary to remodel it, which was inconvenient because of increased man-hours and costs.

Means for Solving the Problems The present invention is to solve the above-mentioned problems, and to the inside of a cavity through a blow passage formed by a sand inlet opening at both end faces of a hollow cylinder and a sand outlet communicating with each other. A core forming blow nozzle for blowing sand with air, wherein a gas vent hole penetrating from a side surface to the blow passage is provided.

Operation According to the above-mentioned means, the blow nozzle and the exhaust vent can be easily used by attaching / detaching the plug or the slit valve to / from the sand inlet, the sand outlet and the gas vent.

Embodiment An embodiment of the present invention will be described with reference to FIGS. 1 to 5. A core molding blow nozzle 1 for blowing sand together with air into a cavity has a hollow cylindrical shape. The mouth 2 and the sand discharge port 3 communicate with each other to form a blow passage 4, and a gas vent hole 5 penetrating from a side surface is provided in the middle of the blow passage 4. In this core molding blow nozzle 1, the sand discharge port 3 side is inserted into the blow nozzle insertion port of the mold 7 through the packing 6, and the sand introduction port 2 side at the other end is inserted through the blow head 8. It is connected to a sand supply source (not shown).

When the core molding blow nozzle 1 having the above-mentioned configuration is used as a blow nozzle, as shown in FIG. 2, a plug 9 is inserted into the gas vent hole 5 to close it, and is sent together with air from a sand supply source. The sand thus formed is guided from the sand inlet 2 to the sand outlet 3 through the blow passage 4 and blown into the cavity formed in the mold 7 to mold the core. The plug 9 may be made of hard urethane or cork as long as it can prevent air from leaking from the gas vent hole 5. Next, when the core molding blow nozzle 1 is used as an exhaust vent,
As shown in the figure, the plug 9 is removed from the gas vent hole 5, the plug 10 is inserted into the sand inlet 2, and the slit valve 11 is attached to the sand outlet 3. Then, the sand and the sky sent from the sand supply source are blocked by the embedding plug 10 and cannot flow into the blow passage 4, and conversely, the air blown from the other core molding nozzle is discharged from the inside of the cavity. It flows into the blow passage 4 through the slit valve 11 and is exhausted from the gas vent hole 5. In addition, a vertical groove 12 is provided in the insertion portion of the core molding blow nozzle 1 to form a passage for the air discharged from the gas vent hole 5 and to remove the core molding blow nozzle 1. Is also available. In addition, FIG. 5 shows an example of the structure of the slit valve 11, in which a large number of slits 14 narrower than the sand grains 13 are provided to prevent air from passing through while allowing air to flow.

Effect of the Invention According to the present invention described above, the blow nozzle for core molding is a dual-purpose core molding nozzle that allows easy use of a blow nozzle and an exhaust vent by attaching and detaching a plug and a slit valve. Since it is possible to switch between the blow nozzle and the exhaust vent without the need for modification, it is possible to reduce the number of man-hours and costs for producing the mold and the core.

[Brief description of drawings]

FIG. 1 is a sectional view showing a core molding blow nozzle according to the present invention, FIG. 2 is a sectional view showing a state where the core molding blow nozzle is used as a blow nozzle in FIG. 1, and FIG. Sectional drawing which shows the state which used the core molding blow nozzle as an exhaust vent, FIG. 4 is sectional drawing which follows the IV-IV line of FIG. 3, and FIG. 5 is sectional drawing which shows the structural example of a slit valve. ,
FIG. 6 is a diagram for explaining molding of a core, and FIG. 7 is a sectional view showing a conventional core molding blow nozzle. 1 ... Blow nozzle for core molding, 2 ... Sand inlet, 3 ...
… Sand outlet, 4 …… Blow passage, 5 …… Gas vent, 6 ...
… Packing, 7… Mold, 8… Blowhead, 9, 10…
… Buried wire, 11 …… Slit valve.

Claims (1)

[Scope of utility model registration request] 1. A core-forming blow nozzle for blowing sand together with air into a cavity through a blow passage formed by a sand inlet opening at both end faces of a hollow cylinder and a sand outlet communicating with each other. A blow nozzle for molding a core, characterized in that a gas vent hole passing through the blow passage is provided.