JPH0191919A - Coining device for dental plate - Google Patents

Abstract

PURPOSE:To enable coining quickly and efficiently by few personnel by executing the introduction and exhaust of a gas independently by the respective dividable furnace. CONSTITUTION:The die 17 for forming a dental plate is charged to the furnace inside 10b of a lower furnace 6b and a super plastic metal sheet 5 is placed on a gasket 9b. The lower furnace 6b is then moved underneath an upper furnace 6a and when the lower furnace 6b is raised by operating a jack device 32, the combined upper furnace 6a is held airtightly by the furnace insides 10a, 10b of the lower furnace 6b. An inert gas is fed into the furnace 10a, 10b through gas lead-in holes 11a, 11b and at the time when the replacement of the furnace interior 10a, 10b is completed the power source of heaters 16a, 16b is inputted to heat the furnace interior 10a, 10b until a super plastic temp. of the metal sheet 5 is kept. At the time when temp. sensors 19a, 19b show the specified super plastic temp. the gas pressure of the upper furnace 6a side furnace interior 10a is increased. The metal sheet 5 is pressed to a forming die 17 and by holding the necessary gas pressure the metal sheet 5 is pressed to the forming die 17 without any gap to form an elaborate dental plate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for coining a denture base using a superplastic metal.

[Conventional technology]

The denture base is the part that comes into contact with the gum bank or the roof of the mouth in order to improve the stability of the denture, and is required to have a precise shape, thinness, lightness, strength, etc. There are two types of metal floors made of various metals: cast and coined.

[Problem that the invention seeks to solve]

However, it is difficult to make the casting bed thinner.

Casting defects such as blowholes are likely to occur, resulting in a high product defect rate.

Problems have been pointed out, such as the casting surface being not smooth and requiring careful surface polishing. In addition, the press equipment for the coining bed is expensive, and it requires multiple pressing steps and annealing.
Higher costs.

Due to the springback phenomenon of the metal plate, it is difficult to obtain a precise shape according to the mold.

The present invention provides a coining apparatus for metal denture bases that solves all of these conventional problems at once.

[Means for solving problems]

By the way, the present applicants have developed a denture base made of superplastic metal as a metal base that solves the conventional problems.
Tsutsumi is considering the method of manufacturing it (Tokukura Showa 61-24002)
4R denture coining base and its manufacturing method"), this is due to the characteristics of superplastic metals, that is, when heated to a specific temperature and tension is applied, it stretches like candy, and when pressed against a mold, it deforms freely and conforms to the mold. It was developed by focusing on the properties of
In a pressure vessel l having airtightness as shown in FIG.
This is a method for manufacturing a metal bed with an extremely precise shape without springback by heating the material to a superplastic temperature and then pressing it against the mold 2 with fluid pressure from the fluid introduction pipe 4.

The present invention is an apparatus for carrying out the above method efficiently and with high precision on an industrial scale, and as shown in FIG. A denture base molding mold 5 is installed, a superplastic metal plate 5 is arranged on its molding surface, and shutters 5a and 5b are arranged so that the denture base molding mold 17 and the metal plate 5 can be heated. and shutter 5a,
5b has a structure in which the metal plate 5 is sandwiched through the gas care 1'9a+9b, and the shutters 5a and 5b have gas introduction holes 1f a and llb and gas exhaust holes 12a, respectively.
12b, and one or both of the furnaces is further provided with a temperature sensor 19a, 1 for measuring the atmospheric temperature inside the furnace.
9b is arranged.

[For production]

According to the above configuration, one side 6a and the other 6b of the furnace can be divided.
Each of them can independently introduce and exhaust gas, and the inside of the furnace 10a, 10b partitioned by the superplastic metal plate 5 can be replaced with a required gas atmosphere. Therefore, by stopping or reducing the exhaust of one side 6a or the other side 6b, the insides of the furnaces 10a, 10 of both 5a, 5b can be
A differential pressure can be generated at b. Inside the furnace 10a, 10
The superplastic metal plate 5 heated to a required superplastic temperature by the heaters 16a and 16b of b is pressed against the denture base forming mold 17 in the furnace by the above-mentioned differential pressure, and is formed into a denture base.

〔Example〕

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is a longitudinal sectional side view of an example of a device according to the present invention.

A furnace 6 for coining the superplastic metal plate 5 is divided into an upper part and a lower part. Both the upper side (hereinafter referred to as 1 furnace 6a) and the lower side (hereinafter referred to as lower door 6b) of the furnace 6 are composed of a plurality of furnace walls (in the illustrated example, an inner wall 77, an intermediate wall 7□, and an outer wall 7).
．． (triple wall structure), and a heat insulating material 8 is filled between these walls. Also each wall above? ,,T,,? , a heat-resistant alloy such as stainless steel or airtight ceramics is used, and gaskets 9a and 9b made of a heat-resistant alloy such as nickel-chromium are provided at the joint between the first furnace 6a and the lower door 6b, and in the example shown, the joint surface of the furnace wall. be. Gaskeno under this E) 9a
, 9b is the furnace interior 10ae of both the combined one furnace and lower door.
10b airtight, and 1 furnace 6a and lower door 6b.
It serves to hold the superplastic metal plate 5 between them.

1 Furnace 6a and lower door 6b are connected to the inside of the furnace 10a from the outside.
, 10b, gas introduction holes lla, llb, and gas exhaust hole 1, which exhausts the gas in the furnace IQa, 101).
2a, 12b are provided, which allows the inside of the furnace 10a, 1
The 0b atmosphere can be replaced with a required inert gas atmosphere.

Further, when the exhaust operation of either the upper door 6a side or the lower door 6b is stopped, a gas pressure difference can be generated between the upper door interior 10a and the lower interior interior 10b.

For this reason, a reinforcing plate 13 against gas pressure from the upper door 6a side is provided at the bottom of the inner wall 71 of the lower door 6b. This reinforcing plate 13 is supported at the bottom of the lower door 6b by connecting a spherical-headed pole 14 hanging from the reinforcing plate and a bolt 15 screwed into the bottom of the lower door 6b.

Heaters 16as 16b are provided at the top of the furnace interior 10a of the main furnace and at the bottom of the furnace interior 10b of the lower door, and a pedestal 18 for placing a denture base molding mold 17 is provided at the center of the bottom of the furnace interior 10b of the lower door. It is provided.

The heaters 16a and 16b are for heating the gas in the furnaces 10a and 10b, and the superplastic metal plate 5 and the denture base forming mold 17 are heated by direct contact with the heated gas.
is heated to the required temperature.

The main furnace 6a and the lower door 6b have furnace interiors 10b and 1, respectively.
temperature sensor 19a for measuring the gas temperature of 0b;
19b and the connectors 2Qa and 20b that connect the heaters 15a and 16b to external electric wires are installed in the holes 21a and 21b.
is provided.

In the illustrated example, the top of the main furnace 6a and the bottom of the lower door 6b are formed into lids 22a, 22b that can be opened and closed for internal inspection and the like. Are these IE22a and 22b intermediate walls? ,,? , are fastened by a plurality of bolts 24 through copper rings 23a, 23b.

The above constitutes the bottom of the lower door 6a! 22b has wheels 25
There are two wheels each at the front and rear.

The lower door 6b can be moved by the wheels 25 on a track 27 laid on a groove-shaped base 26 using manual, pneumatic, hydraulic, or other driving means. Further, in the illustrated example, the main furnace 6a is fixed to a portal frame 28 extending over a track 27 with bolts 29, thereby allowing the main furnace 6a and the lower door 6b to move relative to each other. Orbit 2
7 is provided with a stop plate 30 for stopping the movement of the lower door 6b directly below the main furnace 6a. 31 is a bolt for fine adjustment of the stop position.

Furthermore, a hydraulic jack M32 is installed on the groove base 26 below the main furnace 6a. This jacking device 3
2, attach the funnel-shaped end 32' to the bottom 21b of the lower door 6b.
The main furnace 6a and the lower door 6b are combined and divided by this to raise and lower the entire lower door 6b.

Next, the operating procedure of the apparatus having the above configuration will be explained.

■ The denture base forming mold 1 is placed in the furnace interior 10b of the lower door 6b, which has been moved laterally on the track 27 from just below the main furnace 6a.
7, and a superplastic metal plate 5, such as an α+β type titanium alloy plate or a δ+γ two-phase stainless steel, is placed on the gasket 9b.

■ Next, move the lower door 6b to below the main furnace 6a.

■ Operate the jacking device 32 to raise the lower door 6b. Then, the upper surface of the superplastic metal plate 5 is pressed against the gasket 9a of the main furnace 6a, and the furnace interiors 10a and 10b of the combined main furnace 6a and lower door 6b are kept airtight.

■ In this state, stop raising the lower door 6b, and
Inert gas is introduced into IQb through gas introduction holes 1)a and 1)b, respectively. At this time, connect the gas exhaust holes 12a and 12b of the main furnace and lower door to the exhaust pump to remove tea in the furnace.
, 10b. The time required for replacement is about 5 to 30 minutes.

■ When the replacement of in-furnace IQa and 10b is completed, turn on the power to heaters 15a and 16b, and replace in-furnace lOa and 10b.
is heated until the metal plate 5 reaches its superplastic temperature (800° to 900°). The time required for heating is about 1 hour.

■ Temperature sensor 19a inserted into furnace interior 10a, 10b
, 19b reach a predetermined superplastic temperature, the lower furnace 6a
The gas pressure in the side furnace 10a is increased. The metal plate 5 is pressed against the mold 17 by this gas pressure. By maintaining the required gas pressure (MAX 9 kg/aJ) for 30 to 1 hour, the metal plate 5 is pressed against the mold 17 without any corners, forming an elaborate denture base.

In addition, immediately after replacing the inert gas, open the gas exhaust hole i.
2a and i2b are closed, the furnace interiors 10a and 10b are sealed, and the temperature inside the furnace is raised to the superplastic temperature of the metal plate 5. Thereafter, the main furnace interior 6a and the side furnace interior 10a are raised to the required gas pressure to perform forming. You may.

(2) When the molding is completed, the power to the heaters 16a and 16b is turned off, and the mold is allowed to cool for about 1 hour.

■ After cooling is completed, operate the jacking device 32 to open the lower door 6a.
descend onto orbit 27.

(2) Move the lower door 6b from directly below the furnace 6a to the side along the track 27, and take out the finished denture base from the furnace interior 10b of the lower door 6b.

〔Effect of the invention〕

As explained above, the apparatus of the present invention can quickly and efficiently coin a superplastic metal denture base with a very small number of personnel. Therefore, it is possible to supply high-precision denture bases with excellent compatibility within the oral cavity in large quantities at low cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of an apparatus according to the present invention, and FIG. 2 is a schematic sectional view illustrating the present invention in detail. In the figure, 5: superplastic metal plate, 6: furnace, 6a upper furnace, 6b:
Lower door, 9a, 9b: gasket, 10a: inside of 1 furnace,
10: Inside the furnace of the lower door, lla, 1) b: Gas introduction hole, 12
a, '1.2b: gas discharge hole, 16a, 15b: heater, 17: denture base molding mold, 19a, 19b: temperature sensor, 25: wheel, 27: track, 32: jacking device. Applicant: Aihara Machinery Co., Ltd. Applicant:
Kunio Ogawa, Commissioner of the Patent Office, Sumitomo Metal Industries, Ltd. 1. Display of the case 1988 Patent Application No. 248490 2, Name of the invention: Denture base coining device 3, Person making the amendment 4, Agent 6, Subject of amendment [Detailed explanation of the invention in the specification] column and Corrections will be made to columns a and 10bJ of "Brief explanation of drawings in the specification." (2) The last line of the 7th page of the same page has been corrected to read ``Middle Wall?+, ?+ J'' as ``Middle Wall 71.7 Proverbs.'' (3) Correct the phrase ``Lower door 6aJ'' on the 3rd line of the same page 8 to ``Lower door 6bJ.'' (4) Correct the phrase ``Bottom 21bJ'' on the 4th line from the bottom of the same page 8 to ``Bottom 22b.'' . (5) On page 10, line 1), "30 to 1 hour" should be corrected to "30 minutes to 1 hour." (6) 1st page) The third line from the bottom of the page says ``10: Inside the lower door furnace.'' rlOb: Inside the lower door furnace.''
will be corrected. that's all

Claims (5)

[Claims] (1) A denture base molding mold is installed in one of the furnaces that can be divided into two, a superplastic metal plate is arranged on the molding surface, and the denture base molding mold and the metal plate are heated. Both furnaces are arranged such that the metal plate is sandwiched between the two furnaces through a gasket, and both furnaces each have a gas inlet hole and a gas exhaust hole, and one or both of the furnaces are arranged so that the metal plate is sandwiched between the two furnaces. A coining forming device for a denture base, characterized in that the furnace is provided with a temperature sensor for measuring the temperature of the atmosphere inside the furnace. (2) The denture base coining apparatus according to claim 1, wherein both the furnaces are of direct heating type. (3) The denture base coining apparatus according to claim 1, wherein both furnaces are movable relative to each other after being divided into two. (4) The denture base coining apparatus according to claim 1, wherein the inner surface of the furnace is made of metal or airtight ceramics. (5) The denture base coining apparatus according to claim 1, wherein the relative movement of the furnace is performed manually, pneumatically, or hydraulically.