JPS6260249B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a material supply device for a wax mold forming machine for lost wax, and in particular, to a constant temperature bath containing a soaking medium and a plurality of materials provided in the constant temperature bath. A wax molding machine for lost wax consisting of a storage cylinder, a flexible material supply pipe connected to the material storage cylinder via a detachable connection lid, and a connection block attached to the tip of the material supply pipe. This relates to a material supply device.

Generally, various molding machines are used to mold wax molds for lost wax, but most of them are cartridge type machines as shown in FIG. 1A. That is, 1 is a heating and pressure-resistant cylinder having a nozzle 3 at its tip 2. Reference numeral 4 denotes a heat insulating jacket provided around the outer periphery of the heating and pressure-resistant cylinder 1. A cartridge 5 is filled with a semi-solid wax material 6, and the cartridge 5 is inserted into the heat-resistant cylinder 1. 7 is an injection ram, 8 is an injection drive source, and 9 is a mold. In this type of wax molding machine, the material supplied into the heated and pressure-resistant cylinder is in a semi-solid state, and its semi-solid state is maintained during the injection process by the heat retaining function of the heat insulating jacket 4. It is something that

However, when making a material into a semi-solid state,
It is necessary to heat the entire material uniformly; if such uniform heating is not achieved, the wax mold shrinks unevenly due to local temperature gradients in the material, resulting in cavities in the wax mold. There is a risk that cracks may occur, resulting in product defects. And it takes a long time to heat a considerable amount of material to a uniform temperature.

For this purpose, conventionally, a cartridge 5 as shown in FIG. 1B was filled with the material 6, and the cartridge 5 was slowly boiled in hot water in a constant temperature bath to semi-solidify the material.

When using such a cartridge, the cartridge must be heated in hot water in a constant temperature bath and then inserted into a heated pressure-resistant cylinder. Because there is a large head difference between the tank and the heating and pressure-resistant cylinder located above the table of the molding machine at a suitable head for operational convenience, there was a disadvantage that replacing the cylinder required extremely heavy labor. Furthermore, the cartridge has a considerable high temperature, so its operation is not necessarily safe, and there is also the disadvantage that workability is significantly reduced.

Furthermore, since a large number of cartridges for soaking the heat are required, there is a disadvantage that economical efficiency deteriorates.
In view of the problem of material supply in a molding machine based on the above-mentioned conventional technology, an object of the present invention is to provide a large number of material storage cylinders in a constant temperature bath, and to supply material heated to a semi-solid state in the material storage cylinders to a supply pipe. This is an excellent lost wax product that eliminates the above disadvantages by directly injecting the material into the heated and pressure-resistant cylinder through the The present invention aims to provide a material supply device for a wax molding machine.

The structure of the present invention in accordance with the above object is that, when supplying materials, the material heated in a thermostat and turned into a semi-solid is injected directly into the heated pressure-resistant cylinder from the nozzle of the heated pressure-resistant cylinder through the material supply pipe. The gist of this is that it has been made possible to do so.

Next, an embodiment of the present invention will be described below based on FIGS. 2 and 3. Note that each component is the same as the component indicated by the same reference numeral in FIG.

Furthermore, in the embodiment shown in FIGS. 2 and 3, reference numeral 10 is a cylindrical constant temperature bath, the inside of which is filled with a heating medium 11, and a rotating chamber supported by a suitable frame 12. It is rotatably supported by a shaft 13. Numeral 14 is a material storage cylinder filled with material M, which passes through the thermostatic chamber 10 in the axial direction, and is installed in plural on the same circumference at appropriate intervals. 15 is a filling ram which is slidably fitted into the material storage cylinder 14;
It has a working culm 15a below. A stopper 16 is provided at the lower end of the material storage cylinder 14 to prevent the filling ram 15 from falling off downward. 17 is a connection lid, with connection opening 1 in the center.
8 and is removably attached to the upper end of the material storage cylinder 14 by an appropriate clamp 19. A three-way valve 2 is provided in the connection opening 18 of the connection lid 17.
A flexible and heat-insulated material supply pipe 21 having a temperature of 0 is connected. The other end of the material supply pipe 21 is provided with a static mixer 22, a shutoff valve 23, and a connecting block 24. The connecting block 24 is provided with a material injection hole 25, one end of which communicates with the material supply pipe 21, and the other end of which communicates with the nozzle 3 of the tip 2 of the heat-resistant cylinder 1 of the molding machine. . Furthermore, the connection block 24
The portion connected to the tip 2 of the heating and pressure-resistant tube 1 has a concave depression 26 that matches the shape of the tip 2.
, and tightly engages with the tip portion 2. 2
7 is a table on which the connection block 24 is placed.

A hydraulic cylinder 28 is attached to the frame 12, and the working culm 28a of the hydraulic cylinder 28 is detachably connected to the working culm 15a of the filling ram 15 by a simple attachment/detachment mechanism 29.
30 is a handle, and an operating shaft 31 of the handle 30
A worm 32 is formed at the tip of the thermostatic chamber 10 and meshes with a worm gear 33 provided on the outer periphery of the lower end of the thermostatic chamber 10 . Note that 34 is a lid of the material storage cylinder 14.

In the above configuration, the material M sealed in each material storage cylinder 14 is stored in the soaking medium 1 in the constant temperature bath 10.
1, it is soaked and becomes semi-solid. A connecting lid 17 is attached to one of the material storage cylinders 14 using a clamp 19. On the other hand, the working culm 28a of the hydraulic cylinder 28 is connected to the working culm 15a of the filling ram 15 via the attachment/detachment mechanism 29. When the hydraulic cylinder 28 is actuated, the filling ram 15
rises, and the semi-solid material M is pushed out and enters the flexible material supply pipe 21 through the connection opening 18 of the connection lid 17. In addition, at this time, the three-way valve 20
is initially opened to the atmosphere, and the air accumulated in the upper part of the material storage cylinder 14 is released to the atmosphere.
After that, it communicates with the connection block 24 side, and prevents air from entering the material.

The material advancing in the material supply pipe 21 is mixed by a static mixer 22 and enters the material injection hole 25 of the connecting block 24. The material is injected into the heating and pressure-resistant cylinder 1 from the material injection hole 25 through the nozzle 3 of the heating and pressure-resistant cylinder 1, and is filled while pushing up the injection ram 7 that has been lowered in advance.

At this time, it goes without saying that the hydraulic pressure of the injection drive source 8 is released. Furthermore, the heating pressure cylinder 1
is pressed against the connecting block 24, and the tip 2 tightly engages the recess 26 of the connecting block 24, so that no leakage of material occurs at the engaged portion.

When the filling of the material M in one material storage cylinder 14 is completed, the connecting lid 17 is closed to the material storage cylinder 14.
and the working culm 28 of the hydraulic cylinder 28.
By removing the attachment/detachment mechanism 29, a is detached from the operating culm 15a of the filling ram 15 of the material storage cylinder. Thereafter, by operating the handle 30, the thermostatic chamber 10 is rotated via the worm 32 and the worm gear 33, and the next material storage cylinder 14 is set at the operating position. Thus, by repeating the above operations, the materials M in all the material storage cylinders 14 are sequentially filled into the heating and pressure-resistant cylinder 1 of the molding machine.
It goes without saying that the number of material storage cylinders can be adjusted to match the amount of material required for the molding operation.

In the above explanation, the thermostatic chamber is rotated to align each material storage cylinder with the hydraulic cylinder. However, by keeping the thermostatic chamber stationary and rotating the hydraulic cylinder, each material storage cylinder can be aligned with the hydraulic cylinder. There is no problem with a configuration in which it is aligned with the cylinder.

As described above, according to the present invention, a plurality of material storage cylinders are provided in a constant temperature bath containing a soaking medium,
Since the material storage cylinder is configured to communicate with the nozzle 3 of the heating and pressure-resistant cylinder of the molding machine through a flexible material supply pipe and a connecting block, the material heated in the material storage cylinder and turned into a semi-solid state is transferred. By operating the filling ram inserted into the lower part of the material storage cylinder, the heating and pressure-resistant cylinder can be directly injected and filled, which is less expensive than the conventional method of filling the material using the cartridge described above. Since cartridges are no longer needed, economic disadvantages are eliminated, and the heavy and dangerous work of replacing cartridges can be eliminated, which has the excellent effect of significantly simplifying material filling work. .

In addition, since the flexible material supply pipe is heat-insulated, the material that has been soaked in a semi-solid state in a thermostatic chamber can be filled into the heating and pressure-resistant cylinder without any temperature drop. It also has the effect of being able to fill more efficiently than the conventional method.

Furthermore, the constant temperature bath is made rotatable, and the materials in each material storage cylinder can be sequentially filled into the heating and pressure-resistant cylinder using one hydraulic cylinder, making it possible to perform semi-continuous molding work, increasing work efficiency. It has the effect of significantly improving

[Brief explanation of the drawing]

FIG. 1A is a sectional view of a wax molding machine using a conventional cartridge, FIG. 1B is a perspective view of the cartridge 5 in FIG. 1A, and FIGS. This shows an example, and the second
The figure is a sectional view, and FIG. 3 is a front view of the thermostatic chamber shown in FIG. 2. 1... Heating pressure cylinder, 3... Nozzle, 10... Constant temperature chamber, 14... Material storage cylinder, 15... Filling ram, 17... Connection lid, 21... Material supply pipe, 24
... Connection block, 25 ... Material injection hole, 28 ...
...Hydraulic cylinder.

Claims (1)

[Claims] 1. A rotatably supported cylindrical constant temperature bath 10,
A plurality of material storage cylinders 14 passing through the thermostatic chamber in the axial direction and arranged on the same circumference, a filling ram 15 fitted into the lower end of the material storage cylinder, and a filling ram 15 fitted into the upper end of the material storage cylinder. Connection lid 1 detachably attached
7. A flexible material supply pipe 21 connected to the connection lid and communicating with the inside of the material storage cylinder, connected to the other end of the material supply pipe and engaged with the tip 2 of the heating and pressure-resistant cylinder 1 of the injection molding machine. A wax molding for lost wax comprising a connecting block 24 that fits together, and a material injection hole 25 bored in the connecting block and having one end communicating with the material supply pipe and the other end communicating with the nozzle 3 at the tip of the heat-resistant cylinder. Material feeding device in the machine.