JPH0622335Y2 - Resin Denture Base Molding Equipment - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a denture base molding device, and more particularly, to a denture base molding machine in which a molten resin is injected and injected into a plaster mold of the denture base formed in a flask. The present invention relates to a denture base forming device.

[0002]

2. Description of the Related Art Conventionally, a denture base is manufactured by pressure-injecting a thermosetting resin such as an acrylic resin into a plaster mold of a denture base formed in a flask and polymerizing and solidifying the denture base. Although the method was used, the molded product obtained by this method was inferior in dimensional accuracy, and was also inferior in impact resistance and abrasion resistance.

As an alternative to this method, in recent years, a thermoplastic resin such as polysulfone resin has been injected and injected into a plaster mold of a denture base formed in a flask to obtain excellent impact resistance and abrasion resistance. Methods for obtaining a denture base have been proposed.

As a conventional resin denture base molding apparatus for molding a denture base by injecting a thermoplastic resin into a denture plaster mold of a flask, as shown in FIG. 8, a hydraulic press equipped with a hydraulic mechanism is used. Unit (50) and hydraulic press unit
A table (51) for placing a flask provided above (50)
And two columns (52) standing on the table (51),
Horizontally installed in the middle of the height of (52) and through hole (53)
A lower support member (54), a cylinder (56) provided on the lower surface of the lower support member (54) so as to communicate with the through hole (53), and having a resin injection port (55) in the bottom wall, (56) A resin heating / melting heater (57) provided around the inner wall,
An upper support member (58) provided horizontally over each upper end of the column (52), and a piston rod drive provided on the upper surface of the upper support member (58) and supplied with pressure oil from the hydraulic press unit (50). A hydraulic cylinder (59), a piston rod (61) driven up and down by the hydraulic cylinder (59) and having a resin pressurizing piston (60) at its lower end, and a resin injection port (55) mounted on the table (51). Resin injection port (6
And a flask (F) having 2) at the top. The resin (R) is filled in the cylinder (56) through the through hole (53) and heated and melted by the resin heating / melting heater (57). When the piston rod (61) is lowered by the hydraulic cylinder (59), the resin pressurizing piston (60)
Is inserted into the cylinder (56) through the through hole (53) and pressurizes the resin (R). The pressurized resin (R) is injected from the resin injection port (55) through the resin injection port (62) into the denture plaster mold (S) of the flask (F) to form a resin denture base. It

However, in the apparatus shown in FIG. 8, the molten resin (R) filled in the cylinder (56).
However, before it is pressurized by the piston (60), it may leak from the resin injection port (55), adhere to the resin injection port (62) and solidify, and block the resin. (R) is injected and injected, the resin attached to the resin inlet (62)
Remove (R) with tweezers, etc., and then quickly use resin (R)
It was necessary to perform injection injection, and there was a difficulty in its workability. Whenever the color or type of resin (R) is changed, the cylinder (56) is cleaned by filling the cylinder (56) with cleaning resin (R) and melting and discharging it. It was necessary and troublesome. Moreover, the cylinder
If the power for the resin heating / melting heater (57) is turned off while the molten resin (R) is still being filled in (56), the resin (R) will turn black and the next step will be performed. To do
It was uneconomical to discharge the discolored resin (R) and further to clean the cylinder (56) with a cleaning resin. If the resin (R) is always heated without turning off the power to the resin heating / melting heater (57), the resin (R)
However, the constant use of the heater (57) increases the electricity bill and shortens the life of the heater (57). Furthermore, in order to inject and inject the resin (R) at high speed, it is necessary to drive the piston rod (61) at high speed, and therefore, the hydraulic press that supplies hydraulic pressure to the hydraulic cylinder (59) for driving the piston rod. The unit (50)
Since a very large one has to be used, there has been a problem that the weight of the entire device becomes large and the device becomes expensive.

Therefore, FIG. 9 to FIG. 9 which partially solve the above problems.
A resin denture base forming device shown in FIG. 10 has been proposed. That is, a flask case (71), a piston rod up-and-down drive means (72) arranged above the flask case (71),
Piston rod driven up and down by lifting drive means (72)
(73), a flask (F) housed in the flask case (71) and having a resin inlet (74) at the top, and a cylinder body (7
5a) and a cylinder cap (75
b) a cylinder (75) having a resin passageway (76) on the bottom wall which communicates with the resin inlet (74), and a cylinder body (7).
5a) and cylinder cap (75b) between resin passageways (76)
The aluminum plate (7
7) and the piston rod (7
And a resin pressing piston (78) located below 3). The molten resin (R) filled in the cylinder (75) is pressurized by the resin pressurizing piston (78) as the piston rod (73) is lowered by the lifting drive means (72). Then, when the pressure applied to the resin (R) reaches the required pressure, the aluminum plate (77)
Is broken, and the resin passage of the cylinder (75)
The resin (R) is injection-injected into the plaster mold (S) of the flask (F) through the resin injection port (74) of the flask (76) and the flask (F) to form a resin denture base.

[0007]

[Problems to be Solved by the Invention] However, FIG.
Even the resin-made denture base forming device shown in 10 has the following problems.

That is, the resin (R) filled in the cylinder (75) is pressed by the resin pressing piston (78) to break the aluminum plate (77), and
Since (R) is injected into the denture base plaster mold (S) of the flask (F), the injection speed of the resin (R) is slow, and therefore insufficient casting results in molding of the denture base. Sometimes failed. In addition, since the molten resin (R) is directly filled in the cylinder (75), the resin (R) is
Since it adheres and remains inside (75), whenever changing the color or type of resin (R), incinerate the resin (R) at about 600 ° C using an electric furnace etc. each time, It had to be removed. Moreover, the work of incinerating the resin (R) is not suitable for indoors because it has a bad odor and smoke. Also, if the resin (R) is incinerated, the inside of the cylinder (75) will be contaminated with the combustion products, so the next time the cylinder (75) is used, a troublesome process such as cleaning the cylinder (75) is required. Moreover, the combustion products cannot be completely removed by cleaning, so the cylinder can be used as it is.
When (75) is used, a combustion product is mixed in the molded product and appears as black spots, which may adversely affect hygiene and aesthetics.

In view of the above problems, the object of the present invention is to
When molding resin denture base by injecting resin into the denture plaster mold of the flask, it is possible to perform ultra-high speed injection molding without contaminating the cylinder and by utilizing the repulsive force of the strong spring. Another object of the present invention is to provide a lightweight and inexpensive resin denture base forming device made of resin so that a more accurate molded product can be reliably obtained.

[0010]

In order to achieve the above-mentioned object, a resin denture base molding device according to the present invention injects a molten resin into a plaster mold of a denture base formed in a flask by injection injection. In a resin-made denture base molding device for molding a denture base by a table, a table that is vertically movable along a plurality of vertical guide rods, an elevating and lowering drive unit that elevates and lowers the table, and a table that is horizontally provided over each upper end of the guide rod. And a top support member having a through hole, a spring accommodating portion provided at the position of the through hole on the upper surface of the top support member, a pressing spring accommodated in the accommodating portion, and a through hole and a slide bush. A piston rod urged downward by a spring and having a resin pressurizing piston at the lower end, a flask placed on a table and having a resin inlet at the top, and a resin A cylinder having a resin passage communicating with the inlet to the bottom wall and is characterized by comprising an aluminum-made resin capsule which is located below the loaded and the piston into the cylinder.

As the raising / lowering drive means, one having a pressing mechanism such as hydraulic pressure is used, but it is not particularly limited, and any means capable of raising / lowering the table may be used.

[0012]

When the resin capsule is filled with the molten resin and the table is lifted by the elevating and lowering means, the piston is inserted into the resin capsule and the resin is pressurized by the piston. At the same time, the push spring is compressed. Furthermore, when the resin is pressurized and the pressure applied to the resin reaches the required pressure, the bottom wall of the resin capsule ruptures, and at the same time, the repulsive force of the compression spring that was compressed pushes down the piston at a high speed. The resin is injection-injected at high speed into the denture plaster mold from a location through the resin passage of the cylinder and the resin injection port of the flask. Thus, the resin is injected at high speed into the denture plaster mold of the flask to obtain a molded product.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a resin denture base molding device according to the present invention will be described below in detail with reference to the drawings.

1 to 5 show an embodiment of a resin denture base molding apparatus according to the present invention. The illustrated resin denture base molding device is a resin denture in which a molten denture base is molded by injecting molten resin (R) into a plaster mold (S) of the denture base formed in a flask (F). A floor forming device,
The table (2) that is vertically movable along the left and right vertical guide rods (1) in FIGS. 1 and 3 to 5 and the table (2) by vertically moving the rod (3a) with a hydraulic mechanism. And a hydraulic press unit (3) that raises and lowers the slide bar (5) that is horizontally provided over the upper ends of the guide rod (1) and that has a through hole (4) and a passage communicating with the through hole (4). ), A spring accommodating portion (7) provided at the position of the through hole (4) on the upper surface of the top supporting member (6), and the accommodating portion (7). A spring (8),
Piston rod (10) that is inserted into the passage of through hole (4) and slide bush (5) and is urged downward by push spring (8) and has resin pressing piston (9) at the lower end
Mounted on a table (2) and with a resin inlet on the top
A flask (F) having (11), a cylinder (13) having a resin passage (12) communicating with the resin inlet (11) in the bottom wall, and a cylinder (13) loaded below the piston (9). And an aluminum resin capsule (14) located therein.

The table (2) is provided with table through holes (15) for inserting the guide rods on both sides, and has an upward projecting slide bush for the table (16) having a passage communicating with the table through hole (15). ) Is provided. Guide rod
(1) is the top support member when the table (2) is raised.
A table lift release spring (17) that is compressed between the table (6) and the table slide bush (16) is inserted. The spring accommodating part (7) includes a peripheral wall part (7a) and a peripheral wall part (7a) surrounding the push spring (8).
The top support member consists of a lid (7b) that covers the upper opening of a).
It is fixed at the position of the through hole (4) on the upper surface of (6). A spring retainer plate (18) is provided on the upper end of the piston rod (10). The lower end of the slide bush (5) contacts the upper surface of the piston (9) when the piston rod (10) rises. The aluminum resin capsule (14) is provided with an annular collar portion around the upper end peripheral edge of the cylinder (13) to cover the peripheral edge of the upper end opening of the cylinder (13).
It facilitates the removal of the capsule (14) from 3). The wall thickness of the resin capsule (14) is 0.1 to 0.6 mm at the bottom wall, and is about 500 to 5000 kg.
It is set to break at a pressure of (102 to 1020 kg / cm ² ). The flask (F) consists of left and right flask lids (F1) (F4), a left side flask (F2), and a right side flask (F3), as shown in FIGS. It is fixedly connected by the nut (32). In addition,
The method for forming the plaster mold (S) for the denture base in the flask (F) may be a conventional method that has been conventionally performed.

Next, the process of injecting the thermoplastic resin into the denture base plaster mold (S) of the flask (F) by injection using the resin denture base molding device of the present invention will be explained. Before proceeding to this process Then, divide the flask (F) into left and right once and
After applying the photocurable resin to the surface of (S), it is preferable to cure the photocurable resin by irradiating it with ultraviolet rays and visible light, whereby the thermoplastic resin in the gypsum mold (S) is When injected, it is possible to prevent the thermoplastic resin from deteriorating due to vaporized water in the gypsum.

First, the resin capsule (14) is placed in the cylinder (13).
Is loaded and placed in a recess in an aluminum block of a resin melting furnace (not shown). Then, a small amount (about 6 grams) of thermoplastic resin (R) such as polysulfone resin or reinforced polycarbonate resin is put into the resin capsule (14), and each time it is heated and melted while applying pressure using a pressure rod. I will do it. Repeat this operation about 3 times to obtain the amount of resin necessary for injection injection into the plaster mold (S).
(R) is filled in the resin capsule (14). After the melting of the resin (R) is completed, a small amount (about 5 grams) of the unmelted resin (R1) is put into the resin capsule (14). As a result, in the resin capsule (14), the unmelted resin (R1) is formed above the molten resin (R) layer.
Layer is formed, the molten resin (R) is
Can be prevented from flowing backward. A silicone packing (P) is further placed in the resin capsule (14) of the cylinder (13) taken out from the resin melting furnace, and the state shown in FIG. 2 is obtained.

Then, as shown in FIG. 3, the cylinder (13) containing the molten resin (R) is connected to the resin injection port (1
Place 1) on the recess (35) of the flask (F) so that the resin passage (12) communicates, and set them on the table (2).
In addition, the resin capsule (14) is the resin pressurizing piston (9)
Place the flask on the table (2) so that it can be located below.
It is desirable to previously provide a positioning recess or mark for (F).

When the hydraulic press unit (3) is driven,
The rod (3a) is pushed up by the hydraulic mechanism, which raises the table (2). Then, the resin pressurizing piston (9) is inserted into the resin capsule (14), and
(R) is pressurized by the piston (9). At the same time, push spring
(8) is compressed by the spring retainer plate (18). Next, as shown in FIG. 4, the upper surface of the resin pressurizing piston (9) contacts the lower end of the slide bush (5), and further,
The resin (R) is pressurized by the resin pressurizing piston (9). At this time, the lower end of the slide bush (5) is
It is inserted in the resin capsule (14) together with (9),
Also, the spring (8) remains compressed. Further, when the hydraulic press unit (3) is driven to pressurize the resin (R) with the resin pressurizing piston (9), about 200
When a pressure of 0 to 4000 kg (408 to 816 kg / cm ² ) was reached, the aluminum resin capsule
The bottom wall of (14) broke and the compression spring (8) was compressed at the same time.
The resin pressing piston (9) is pushed down at high speed by the repulsive force of the denture base gypsum mold (11) through the resin passage (12) of the cylinder (13) and the resin injection port (11) of the flask (F) from the breaking point. The resin (R) is injected into the S) at high speed. When the resin (R) spreads in the denture plaster mold (S) of the flask (F), the resin pressurizing piston (9) stops descending, but a pressure of about 20 kg / cm ² is applied by the pressing spring (8). Is maintained.

The molten resin (R) injected and injected into the denture base gypsum mold (S) of the flask (F) is cooled for a while after it is left to stand for a while to be naturally hardened. After curing the resin
Divide the flask (F) into left and right and take out the molded product inside. Since the molded product obtained by injection injection of the resin (R) contains some internal stress, as a method for further improving the accuracy of the molded product, before taking out the molded product, the flask (F) Is preferably heated at 110 to 130 ° C. for about 1 hour to release the internal stress. In this way, a denture base made of resin having high accuracy and excellent impact resistance and abrasion resistance can be obtained.

[0021]

According to the resin denture base molding apparatus of the present invention, since the aluminum resin capsule is loaded in the cylinder and the molten resin is filled in the resin capsule, the cylinder is not contaminated. Therefore, the cleaning work of the cylinder is unnecessary, the workability is improved, and it is economical.

Further, at the same time when the bottom wall of the resin capsule is broken, the resin pressing piston is pushed down at a high speed by the repulsive force of the pressing spring, and the resin is injected and injected into the denture plaster mold of the flask at a high speed. It is possible to reliably obtain a resin-made denture base having a high price, and to make the device lightweight, compact and inexpensive.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a resin denture base molding device according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing a cylinder of a resin denture base forming device.

FIG. 3 is an enlarged cross-sectional view of essential parts showing a resin denture base molding device before resin pressing.

FIG. 4 is an enlarged cross-sectional view of essential parts showing a resin-made denture base molding device during resin pressurization.

FIG. 5 is an enlarged cross-sectional view of essential parts showing a resin-made denture base molding device after resin injection.

FIG. 6 is a sectional view of a flask.

7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a cross-sectional view showing a conventional resin denture base forming device.

FIG. 9 is a cross-sectional view showing a conventional resin denture base forming device.

FIG. 10 is an enlarged cross-sectional view showing a cylinder of the conventional resin denture base forming apparatus of FIG.

[Explanation of symbols]

 1 ...... guide rod 2 ...... table 3 ...... elevation drive means 4 ...... through hole 6 ...... top support member 7 ...... spring accommodating part 8 ...... pushing spring 9 ...... resin pressing piston 10 ...... piston rod 11 …… Resin injection port 12 …… Resin passage 13 …… Cylinder 14 …… Resin capsule F …… Flask S S ・ ・ ・ Denture plaster mold R …… Resin

Claims (1)

[Scope of utility model registration request] 1. A resin denture base molding apparatus for molding a denture base by injecting a molten resin (R) into a plaster mold (S) of a denture base formed in a flask (F). A table that can be raised and lowered along the vertical guide bar (1) of
(2) and lifting drive means (3) for lifting the table (2)
And a top support member (6) that is horizontally provided over each upper end of the guide rod (1) and has a through hole (4), and is provided at a position of the through hole (4) on the upper surface of the top support member (6). The spring accommodating part (7), the push spring (8) accommodated in the same accommodating part (7), the through hole (4), and the push spring (8) that is urged downward and A piston rod (10) with a resin pressurizing piston (9), a flask (F) mounted on the table (2) and having a resin inlet (11) at the top, and a resin inlet (11). A cylinder (13) having a resin passage (12) in the bottom wall, and a piston (9) loaded in the cylinder (13)
And a resin capsule (14) made of aluminum located below the denture base.