JPS6329534Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for assembling a dental flask into an industrial injection molding machine.

Conventionally, to obtain a dental prosthesis made of resin, a model of the dental prosthesis made of a meltable material such as wax, a sprue, and a discharge gate are placed in a pressure flask, and then these are embedded in plaster, and after the plaster hardens, the wax is removed. A plaster mold is made to surround the cavity of the dental prosthesis by melting and pouring out the material, then heat-softened synthetic resin is injected and press-fitted through the sprue hole using an injection molding machine, and after the resin has cooled and hardened, a pressure flask is opened and the plaster is molded. A method has been used to obtain a resin dental prosthesis by crushing a mold.

However, since the plaster mold is weak in strength, the pressure flask that houses the plaster mold must have great strength, and the pressure flask is made of metal and has to be very thick and heavy, making it extremely difficult to handle. It was hot. However, even if such a pressure flask is used, the plaster mold is still fragile and it is difficult to set resin injection conditions such as injection pressure.

Furthermore, it took time to attach the nozzle to the mold and align the centers of the nozzle and sprue opening.

In view of the above circumstances, the present invention aims to provide a device for assembling a dental flask into an industrial injection molding machine, thereby facilitating the handling of the flask, and at the same time increasing the pressure resistance of the plaster mold.

The feature of this invention is that when the dental flask containing the plaster mold is closed, the sprue opening of the mold and the injection opening of the flask are brought into close contact with each other, and when the mold is opened, the sprue opening of the mold and the injection opening of the flask are brought into close contact with each other. Use of a lightweight and thin flask by incorporating it into the mold of an industrial injection molding machine via a sliding mechanism that separates from the mouth and injecting the resin dental prosthesis, and using the mold as a pressure-resistant flask. The goal is to make this possible and enable more efficient production.

Next, embodiments based on the features of the present invention will be described with reference to the accompanying drawings.

Reference numeral 1 denotes an industrial injection molding machine, in which a fixed mold 2 for receiving a flask is provided with a sprue opening 3, and a rail 4 is provided on the upper surface inside the fixed mold 2 for receiving a flask.
A base 4 on which a is formed is provided.

Reference numeral 5 denotes a pedestal which is fitted onto the rail 4a of the base 4 so as to be slidable in the mold opening direction, and the flask 6 can be freely slid in the mold opening direction and detached from the rail 5a formed on the upper surface thereof. It is fitted.

A wedge plate 7 is fixed to the upper surface of the flask 6 by appropriate means, and the upper surface thereof is an inclined surface 7a.

2a is a movable part of the mold, which has a recess 8 into which the base 4, flask 6, and wedge plate 7 fit, and an inclined surface 8a that is in close contact with the inclined surface 7a of the wedge plate 7 is formed on the upper surface. ing.

Reference numeral 9 denotes a connecting arm that connects guide grooves 10 and 10a formed in the sliding direction of the pedestal 5 and the recess 8, respectively, and an end 9a of the arm 9 connects to the guide groove 1.
By engaging with the end portions 10b of the mold movable portions 2a and 10a, the mold movable portion 2a moves and the pedestal 5 slides. In the figure, 6a is the injection port of flask 6, 1
1 is an injection nozzle of an industrial injection molding machine 1.

Furthermore, inside the flask 6, there is a plaster mold 1 as shown in Figure 5.
The plaster mold 12 is provided with a dental prosthesis-shaped cavity 12a, a sprue hole 12b, and a discharge vent hole 12c. In addition, if necessary, a resin reservoir chamber 12d, a runner hole 12e, and a pressure relief chamber 12f are provided.
will be provided. 13 is an artificial tooth made of resin. In the figure, a indicates the sliding mechanism.

Then, as shown in FIG. 5, the dental flask 6 containing the plaster mold 12 is opened in the mold state, and as shown in FIGS.
As shown in Fig. 4, if the mold is closed by fitting it onto the rail 4a of the pedestal 5 and then sliding the mold movable part 2a, the pedestal 5 flask 6 will first fit into the recess 8 and both sides will be tilted. The surfaces 7a and 8a come into close contact, and then the mold movable part 2
The pedestal 5, on which the flask 6 is fitted as if it were an integral part, slides along the rail 4a of the base 4, and the injection port 6a of the flask 6 and the sprue port 3 are aligned as shown by the dashed line in FIG. Due to the wedge action of the wedge plate 7, the mold closing force securely fixes the flask 6 with the injection port 6a pressed against the sprue port 3. In this state, a highly hard synthetic resin that has been softened by heating is injected and press-fitted from the nozzle 11 of the industrial injection molding machine 1.

Next, when the mold movable part 2a is slid to open the mold, the mold movable part 2a first moves backward, and the end 9a of the connecting arm 9 and the guide grooves 10, 10a engage with each other, causing the cradle 5 to open. slides on the base 4, and the sprue port 3 and the injection port 6a are separated.

In this state, the flask 6 is removed from the pedestal 5 by sliding it a little.

Since the present invention is as described above, it can be incorporated into an industrial injection molding machine for injection molding with one touch, allowing for extremely efficient production and allowing the mold of the industrial injection molding machine to function as a pressure flask. A thin and lightweight flask 6 can be used, and the pressure resistance of the plaster mold 12 is also high, which has a great practical effect.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and Fig. 1 is a sectional view showing the device of the present invention installed in an industrial injection molding machine, Fig. 2 is a longitudinal sectional front view of the main part, and Fig. 3 is a cross-sectional view of the same. Figures 4 and 4 are cross-sectional views showing how the base, pedestal, and flask are fitted together, and Figure 5 is a cross-sectional view of the flask and plaster mold. 1... Industrial injection molding machine, 2, 2a... Mold,
a...Sliding mechanism.

Claims (1)

[Scope of utility model registration request] The dental flask containing the plaster mold is placed in close contact with the sprue opening of the mold and the injection opening of the flask by closing the mold, and by opening the mold, the sprue opening of the mold and the injection opening of the flask are brought into close contact with each other. 1. An apparatus for assembling a dental flask into an industrial injection molding machine, characterized in that the flask is assembled into a mold of an industrial injection molding machine via a sliding mechanism to inject and mold a resin dental prosthesis.