JPH0242359Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a core manufacturing apparatus for forming a hollow part of a hollow casting made of aluminum, cast iron, or the like.

(Prior Art) As shown in FIG. 7, as an example of a casting core manufacturing apparatus, a fixed block 1 and a movable block 2, which is movable toward and away from the fixed block 1, are arranged on each opposing surface. A core mold 5 is fixed via a mold support frame 3 and a mold mounting plate 4, respectively, and a large number of gas supply ports are provided in the front of each mold support frame 3, as shown in FIG. There is a burner plate 7 in which burner plates 7 are formed by perforating holes 6 at appropriate intervals.

When manufacturing a core, the burner nozzles attached to each of the gas supply ports 6 are ignited to heat the core molds 5, 5, and both of the core molds 5, 5 are heated.
As shown in the imaginary line in FIG. 7, the cylinder device 8
The two core molds 5, 5 are then filled with sand, and the sand is fired into a predetermined core shape.

By the way, since the core mold 5 has a thick part 5a and a thin part 5b corresponding to the desired core shape, it is difficult to heat the entire core mold 5 evenly.
The thin wall portion 5b is at a higher temperature than the thick wall portion 5a, and the sand in contact with the thin wall portion 5b is excessively burnt.

Therefore, conventionally, a burner nozzle 9 shown in FIG. 9 is screwed onto the gas supply port 6 facing the thick wall portion 5a.
The gas supply port 6 facing the thin wall portion 5b has a 10th
The embolus 10 shown in the figure is screwed onto the embolus 10 so that the thick part 5a and the thin part 5b are evenly heated.

(Problems to be solved by the invention) Since the conventional burner nozzle 9 and embolus 10 are attached to the burner plate 7 by screw fitting, it takes time and effort to attach and detach them, resulting in long loss time and a decrease in manufacturing efficiency. It was hot.

In view of the above-mentioned difficulties, it is an object of the present invention to provide a casting core manufacturing device that allows a burner nozzle and an embolus to be attached and detached with a single touch, does not reduce the attaching and detaching function, and can reliably maintain airtightness. .

(Means for Solving the Problems) In order to achieve the above object, the present invention fixes a core mold 5 to each opposing surface of a pair of mold support frames 3 that can be relatively moved toward and away from each other, and Each core mold 5
In the casting core manufacturing apparatus, which is equipped with a burner plate 7 having a large number of gas supply ports 6 arranged in a dotted manner on the back side of each of the burner plates 7 corresponding to the Each coupler 12a, 12b is fixed to each gas supply port 6, and has an annular stepped portion 14 integrally protruding from the inner peripheral surface of a gas passage 13 communicating with the gas supply port 6. A socket 15, a cam locking mechanism 17 that is built into the socket 15 and moves freely under the force of a spring 16, and is removably locked to the socket 15 through the cam locking mechanism 17, and the rear end A configuration is adopted in which the edge 18 comprises a burner nozzle 19 or an embolus 28 that abuts the annular step portion 14.

(Embodiment) As shown in FIG. 6, the position of the coupler, which is an embodiment of the present invention, provided at each gas supply port 6 of the burner plate 7, facing the thick wall portion 5a of the core mold 5. An ignition coupler 12a is located at the ignition coupler 12a, and a closing coupler 12 is located at a position facing the thin wall portion 5b.
b are attached respectively.

The ignition coupler 12a is screwed onto each gas supply port 6 as shown in FIGS. A cylindrical socket 15 is integrally provided, and a spring 16 is built into the socket 15.
a burner nozzle 19 which is removably locked to the socket 15 via the cam locking mechanism 17 and whose rear end edge 18 abuts the annular stepped portion 14; It is composed of.

The cam locking mechanism 17 includes a cylindrical portion 17a movably inserted into an inner hole of the annular step portion 14, and is integrally fixed to the rear end edge of the cylindrical portion 17a by welding or the like. The spring 16 is attached to the portion 14.
A gas flow hole 21 is formed in the disc part 17b, and a guide protrusion 22 integrally protrudes from the outer periphery of the disc part 17b. The cylindrical portion 17a and the disc portion 17b are movably fitted into a guide slit 23 formed in the axial direction in the socket 1.
5, it is movable only in the axial direction.

Further, a pair of approximately dogleg-shaped cam slits 25 are provided at the front portion of the cylindrical portion 17a, with a spiral slanted cam surface 25a and a socket transverse direction rear end locking surface 25b continuously formed from the front edge thereof. It is symmetrically formed over a 90° range.

Further, a cam pin 26 is fixed to the rear end of the burner nozzle 19 in the diametrical direction, and the rear end of the burner nozzle 19 is inserted into the socket 15 from the state shown in FIG. After making contact, when the burner nozzle 19 is rotated approximately 90 degrees clockwise, the cam pin 26 moves from above the inclined cam surface 25a to the rear end locking surface 25, as shown in FIG.
b against the spring 16, the burner nozzle 19 is locked in the socket 15, and the rear end edge 18 is pressed against the annular stepped portion 14 by the biasing force of the spring 16. Therefore, the airtightness between the socket 15 and the burner nozzle 19 is reliably maintained between the rear edge 18 and the annular step 14 which are in pressure contact with each other.

Further, the cam locking mechanism 17 is built into the socket 15 and is not directly exposed to high heat during heating of the core mold, has a simple structure, and does not deteriorate in performance even if it is slightly oxidized. , the attachment/detachment function can be reliably maintained. Since the rear edge 18 and the annular step 14 are in contact with each other so as to be movable in the radial direction, thermal expansion and contraction of the socket 15 and the burner nozzle 19 in the radial direction can be absorbed between the two. Furthermore, axial thermal expansion and contraction of socket 15 and burner nozzle 19 is absorbed by spring 16. Note that the spring 16 is located inside the burner plate 7, away from the burner nozzle 19, and is cooled by the gas passing through the gas passage 13, so that it is not oxidized by the high heat generated during heating of the core mold. The biasing force can be maintained without fail.

In order to remove the burner nozzle 19 from the socket 15, it is sufficient to rotate the burner nozzle 19 approximately 90 degrees counterclockwise. This produces the opposite effect to that described above, allowing the burner nozzle 19 to be removed from the socket 15 with a single touch.

In FIG. 1, reference numeral 27 denotes a stopper ring that is locked to the rear end of the socket 15 to prevent the cam locking mechanism from falling off.

As shown in FIG. 5, the closure coupler 12b differs from the ignition coupler 12a only in that a bottomed cylindrical embolus 28 is used instead of the burner nozzle 19, and common parts are designated by the same reference numerals. The explanation will be omitted.

According to this configuration, the gas passage 13 of the socket 15 can be closed by the embolus 28, and it is also possible to prevent core sand from entering the socket 15.

In the above embodiment, the case where the gas supply port 6 facing the thin-walled part 5b of the core mold 5 is closed by the closing coupler 12b was explained as an example. A return plate is installed between the burner plate 7 and the core, in which a return pin that moves back and forth in conjunction with the engagement and separation, and a knock-out pin for core release whose tip part moves in and out of each core mold 5, 5 are implanted. In a type of core manufacturing apparatus that is movably disposed between the knockout pin and the mold 5, the gas supply port 6 facing the knockout pin is closed by a closing coupler 12b to prevent the knockout pin from overheating. do.

(Effects of the invention) According to the invention, the coupler provided at each gas supply port of the burner plate can be attached to and detached from the socket via the cam locking mechanism and the socket fixed to each gas supply port. Since it consists of a locking burner nozzle or embolus, the burner nozzle or embolus can be attached to and removed from each gas supply port with a single touch.

In addition, the cam locking mechanism is built into the socket and is not directly exposed to high heat during heating of the core mold.
Moreover, since the structure is simple and the performance does not deteriorate even if it is slightly oxidized, the above-mentioned attachment/detachment function can be maintained reliably.

Furthermore, according to the present invention, an annular step is integrally provided on the inner peripheral surface of the socket, and the rear end edge of the burner nozzle or embolus is urged by a spring and comes into pressure contact with the annular step, so that a so-called mechanical touch is established between the two. Since it is designed to maintain airtightness, there is no gas leakage, and there is no need to use a sealing material that lacks heat resistance such as a rubber ring, so it can be used stably for a long period of time.

Furthermore, as mentioned above, since the rear end edge of the burner nozzle or embolus is in pressure contact with the annular step of the socket to maintain airtightness between the two, there is a slight gap between the socket and the burner nozzle or embol inside it. A floating gap, i.e. a radial gap, can be provided so that the radial thermal expansion and contraction of the socket, burner nozzle or plug during heating of the core mold is absorbed by the gap between the two. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of an ignition coupler used in a casting core manufacturing apparatus according to an embodiment of the present invention, with a burner nozzle attached, Fig. 2 is a view taken along the - arrow in Fig. 1, and Fig. 3 is the same. 4 is a longitudinal sectional view of the coupler in the burner nozzle detached state, FIG. 5 is a longitudinal sectional view of the closure coupler used in the device in the embolization state, and FIG. 6 is a longitudinal sectional view of the main parts of the device. 7 is a partially cutaway overall plan view of the same device, FIG. 8 is a partially cutaway front view of a burner plate used in the same device, FIG. 9 is a perspective view of a conventional burner nozzle, and FIG. FIG. 10 is a perspective view of a conventional embolus. 3... Mold support frame, 5... Core mold, 6... Gas supply port, 7... Burner plate, 12a... Ignition coupler, 12b... Closing coupler, 13
... Gas passage, 14 ... Annular step, 15 ... Socket, 16 ... Spring, 17 ... Cam locking mechanism, 1
8... Rear edge, 19... Burner nozzle, 28...
Embolism.

Claims (1)

[Scope of utility model registration request] A core mold is fixed to each opposing surface of a pair of mold support frames that can be moved relatively close to each other, and a large number of gas supply ports are dotted on the back side of each core mold, corresponding to each core mold. In a casting core manufacturing apparatus equipped with burner plates arranged in a shape, a coupler is provided at each gas supply port, and each coupler is fixed to each gas supply port and a socket having an annular stepped portion integrally protruding from the inner circumferential surface of a gas passage communicating with the socket; a cam locking mechanism built into the socket and movable by a spring;
A casting core manufacturing device comprising a burner nozzle or an embolus which is removably locked in the socket via the cam locking mechanism and whose rear edge abuts the annular step.