JP2017189796A - Core molding apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a core molding apparatus capable of shortening a molding time period while reducing the size of a molding facility of a core thereby to suppress the equipment cost.SOLUTION: A core molding apparatus of the invention comprises a molding tool 5, a clamp mechanism 7, a mold closing mechanism 9, a microwave heating device 11 and a charging device. The core molding apparatus is caused to have a molding tool 6, clamped by the molding mechanism 9, hold a mold closing state by the clamp mechanism 7, to charge the inside of a cavity 15 of the molding tool 6 sequentially with core sand 3, and to shape the core by heating and solidifying the core sand 3 by the microwave heating device 11. As a result, a plurality of molding tools 5 are prepared, and the molding tools 5 are sequentially transferred to the mold closing mechanism 9, the charging device and the microwave heating device 11, so that the individual steps can be simultaneously performed. Thus, the molding tools can be employed to mold the cores efficiently by running the molding tools 5 thereby to shorten the molding time period and to reduce the size of a production facility thereby to suppress the equipment cost.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a core forming apparatus for forming a core by firing core sand kneaded with sand and a binder containing water glass.

  An example of a conventional core molding apparatus that heats and solidifies the core sand to model the core will be described with reference to FIG. As shown in FIG. 5, the core forming apparatus 101 includes a molding die 105, a heater 104 built in the fixed die 105 a and the movable die 105 b in order to keep the molding die 105 at a high temperature, and molding during firing. A mold clamping mechanism 109 that restrains the mold 105 is provided so that the mold 105 does not open. When a plurality (three in the illustrated example) of core forming apparatuses 101 are formed in parallel, a plurality of core forming apparatuses 101 are provided according to the number of cores to be formed.

  In addition, as a prior art related to a core forming apparatus for forming a sand core, for example, in Patent Document 1, four forming dies arranged two at the top and two at the bottom and two forming dies at the top and the bottom are simultaneously provided. A mold clamping and mold opening mechanism for clamping and opening, a broad head that moves up and down and can be connected to one mold on the upper stage and one mold on the lower stage, the other mold on the upper stage, and the other on the lower stage A sand mold forming apparatus including a broad head connectable to the mold is disclosed. In this sand mold forming apparatus, four molds were simultaneously clamped by a mold clamping and mold opening mechanism, and casting sand was blown into the cavities of the upper two molds by each broad head to start firing of the foundry sand. Thereafter, each broad head is moved to blow the foundry sand into the lower two molds, and the foundry sand is blown and fired sequentially.

JP 7-88595 A

  However, the conventional core forming apparatus 101 shown in FIG. 5 has the following problems. When the core forming apparatus 101 forms a plurality of cores in parallel, since each heater 105 and the mold clamping mechanism 109 are provided in each mold 105, the production facility becomes large. In addition, there is a problem that an electric power supply system is required to supply electric power to the heater 104 of the mold 105, and the equipment is large and expensive.

  Further, in the sand mold forming apparatus described in Patent Document 1 described above, a mold clamping and mold opening mechanism that simultaneously clamps four molding molds arranged two at the upper and lower stages, and two movable broad heads Is necessary, the structure is complicated, the equipment is large, and the cost is high.

  The present invention has been made in view of the above points, and is to provide a core forming apparatus capable of reducing the modeling time while reducing the size of the core forming equipment and reducing the equipment cost. Objective.

In order to solve the above-described problems, a core forming apparatus according to the present invention fills a molding sand cavity with sand and a binder containing water glass, and heats the core sand. A core molding device that molds the core by solidifying,
A mold clamping mechanism for applying a mold clamping force to the mold;
A clamp mechanism that is provided integrally with the mold and holds a clamping force;
And a microwave heating device that heats the core sand filled in the cavity with microwaves.

  According to the present invention, the mold clamped by the mold clamping mechanism holds the mold clamped state by the clamp mechanism, sequentially fills the core sand, and heats the core sand by the microwave heating device. Since it can be solidified, it is possible to reduce the molding time while miniaturizing the core molding equipment and reducing the equipment cost.

It is explanatory drawing which shows the process of modeling a core one by one using a some shaping | molding die with the core shaping apparatus which concerns on one Embodiment of this invention. It is sectional drawing which shows the shaping | molding die and clamping mechanism of the core shaping apparatus of FIG. It is sectional drawing of the state which installed the shaping | molding die of FIG. 2 in the microwave heating apparatus. It is the schematic which shows the modeling process of the core by the core shaping apparatus of FIG. It is a schematic sectional drawing which shows the conventional core shaping apparatus.

Hereinafter, a core forming apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS.
The core forming apparatus 1 of this embodiment is for heating and solidifying core sand kneaded with sand and a binder containing water glass to form a core. As shown in FIGS. 1 to 3, the core forming device 1 includes a forming die 5, a clamping mechanism 7, a clamping mechanism 9, a microwave heating device 11, and a filling device 13. The core sand 3 (see FIGS. 3 and 4) is obtained by kneading sand and a binder containing water glass into a foamed state.

  The mold 5 has a low coefficient of thermal expansion and is made of a material having heat insulation and insulation (for example, alumina ceramics), and is separate from the mold clamping mechanism 9, the microwave heating device 11, and the filling device 13. Are provided so as to be separable. The molding die 5 includes a fixed die 5a, a movable die 5b, and a base portion 5c. The cavity 15 is formed by clamping the fixed die 5a and the movable die 5b. The fixed mold 5a is fixed to the base portion 5c (see FIG. 2). The movable mold 5b is formed with an engaging portion 6 that engages with a swing portion 8 of a clamp mechanism 7 described later (see FIGS. 4D and 4E).

  The clamp mechanism 7 holds the mold clamping force applied to the mold 5 by the mold clamping mechanism 9, and a plurality of the clamp mechanisms 7 are arranged on the sides of the fixed mold 5 a and the movable mold 5 b and are fixed to the base 5 c. Yes. The clamp mechanism 7 includes a swing portion 8, a screw portion 10, and a base 12. The swing portion 8 is attached to the screw portion 10 and is movable between a clamp position (see FIG. 4A) and an unclamp position (see FIGS. 4D and 4E). Further, the swing part 8 is movable along the axial direction of the screw part 10 by rotating the screw part 10. Then, the fixed mold 5a and the movable mold 5b are closed, the swing part 8 is moved to the clamping position, and the screw part 10 is rotated in a state where it is engaged with the engaging part 6 of the movable mold 5b, thereby clamping the mold. It can be performed. The base 12 is fixed to the base portion 5 c of the mold 5.

  The mold clamping mechanism 9 is for clamping and opening the mold 5, and in this embodiment is a nut runner that can rotationally drive the screw portion 10 of the clamp mechanism 7. When the mold 5 is clamped, the mold clamping mechanism 9 applies a positive rotation to the screw part 10 of the clamp mechanism 7 to move the swing part 8 downward in the axial direction so that the mold clamping force is applied to the mold 5. Is granted. When the mold 5 is opened, the screw part 10 is rotated in the opposite direction, and the swing part 8 is moved upward in the axial direction so that the mold 5 can be opened.

  The microwave heating device 11 is for irradiating and heating the core sand 3 filled in the cavity 15 of the mold 5 with microwaves. The microwave heating device 11 includes a magnetron oscillator 17, an antenna 19, and a shield 21. The magnetron oscillator 17 is connected to an antenna 19 and oscillates when power is supplied from a power source (not shown), and emits a microwave having a frequency of 2450 MHz from the antenna 19. The shield 21 is a metal mesh shield that covers the mold 5 and prevents leakage of microwaves emitted from the antenna 19 to the outside. The shield 21 is formed so that the mesh gap is smaller than the wavelength of the microwave (about 12 cm).

  The filling device 13 is for filling the core sand 3 into the cavity 15 of the mold 5 by a pressurizing mechanism (not shown) such as a cylinder. Further, conveying means such as a conveyor and a traveling carriage for conveying the mold 5 to the mold clamping mechanism 9, the microwave heating device 11, and the filling device 13 are provided as appropriate.

Next, the modeling process of the core modeling apparatus 1 of this embodiment is demonstrated with reference to FIG.1 and FIG.4.
First, the mold 5 is closed and set in the clamping mechanism 9, and the swing part 8 of the clamping mechanism 7 is moved from the unclamping position (see FIG. 4 (e)) to the clamping position (FIG. 4 (a)), Engage with the engaging portion 6 of the movable mold 5b. Thereafter, the mold clamping mechanism 9 rotates the screw portion 10 of the clamp mechanism 7 in the forward direction to move the swing portion 8 downward in the axial direction, thereby applying a mold clamping force to the mold 5. Is clamped (see FIG. 1 (a) and FIG. 4 (a)). At this time, even if the rotational driving by the mold clamping mechanism 9 is released, the clamping force is held by the clamp mechanism 7.

  Next, the mold 5 that has been clamped is transported to the filling device 13 and connected to the filling device 13, and the core 15 is filled into the cavity 15 of the molding die 5 (FIGS. 1B and 4). (See arrow in (b)).

  Next, the mold 5 filled with the core sand 3 is conveyed to the microwave heating device 11 and placed in the shield 21 of the microwave heating device 11. Then, the core sand 3 is irradiated with microwaves by the magnetron oscillator 17 and the antenna 19 of the microwave heating device 11, and the core sand 3 is heated and solidified (FIG. 1 (c) and FIG. 4 (c)). reference). During firing, the screw part 10 of the clamp mechanism 7 is loosened as appropriate, and the mold 5 is slightly opened to promote the evaporation of moisture.

  Next, the molding die 5 is taken out from the shield 21, the screw portion 10 is rotated in the reverse direction by the die clamping mechanism 9, and the swing portion 8 is moved upward in the axial direction, so that the die clamping applied to the molding die 5 is performed. Weaken power. Thereafter, the swing part 8 is moved from the clamping position to the unclamping position, the mold 5 is opened, and the fired product 14 is taken out (see FIGS. 1D and 4D).

  Next, the mold 5 is cleaned and a release agent is applied (see FIGS. 1E and 4E).

  According to the core forming apparatus 1 according to the present embodiment, the molding die 5 integrally provided with the clamp mechanism 7 is sequentially conveyed to the mold clamping mechanism 9, the filling device 13, and the microwave heating device 11, and the core is removed. Since modeling is performed, a plurality of molding dies 5 are prepared, and each of the molding dies 5 is sequentially conveyed to the clamping mechanism 9, the filling device 13, and the microwave heating device 11, and each process can be performed simultaneously. Thus, since the some shaping | molding die 5 can be operated, a some core can be modeled efficiently and modeling time can be shortened. In addition, the production equipment can be downsized and the equipment cost can be reduced.

  Furthermore, since the core sand 3 filled in the cavity 15 of the mold 5 is directly heated by the microwave of the microwave heating apparatus 11, it is not necessary to heat the mold 5 and the heat insulating molding is performed. By using the mold 5, the mold 5 does not easily reach a high temperature. Thereby, since thermal expansion of the shaping | molding die 5 can be suppressed, the clamping force of the shaping | molding die 5 by the clamp mechanism 7 can be reduced, and a shaping | molding die can be clamped with small clamping force. In addition, power consumption for heating can be reduced.

  DESCRIPTION OF SYMBOLS 1 ... Core shaping apparatus, 3 ... Core sand, 5 ... Mold, 7 ... Clamp mechanism, 9 ... Clamping mechanism, 11 ... Microwave heating apparatus, 15 ... Cavity

Claims (1)

A core forming apparatus for forming a core by filling core sand kneaded with sand and a binder containing water glass into a cavity of a mold, and heating and solidifying the core sand,
A mold clamping mechanism for applying a mold clamping force to the mold;
A clamp mechanism that is provided integrally with the mold and holds a clamping force;
A core forming apparatus, comprising: a microwave heating apparatus that heats the core sand filled in the cavity with a microwave.

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