JP2007037676A - Casting device for dental technique - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve operationality and workability for workers during the casting by using a metal material or the like he/she has never used. <P>SOLUTION: When the worker enters selected information on a liquid phase temperature of the metal used for the casting, the amount of the metal, and an investment material of a cast mold in an operation part 42, a program creating part 41 automatically creates an operation program including a temperature program for a heating furnace and pressurizing timing during the casting based on the entered information, and a control part 40 controls a heating temperature by a heater 14 and the opening and closing of a gas introducing valve 50 in accordance with the operation program. Since the liquid phase temperature of the metal is described in an instruction book provided by a metal manufacturer, and the amount of the metal is the weight of the metal actually housed in the crucible by the worker, they are easily acquired. Consequently, since the entry of these items imposes a slight burden on the worker compared to the setting of various temperatures and time required for a conventional device, the workability is greatly improved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a casting apparatus for dental technology for producing a dental prosthesis such as an inlay, a crown (metal crown), a metal floor, an implant, and an implant superstructure with a noble metal or a non-noble metal.

  Loss of some or all of the teeth due to caries, periodontal disease, etc. not only causes mastication, decreased pronunciation function, and changes in appearance, but also adversely affects health. Therefore, it is important to treat early and repair missing teeth. As a method for this repair, a method of replacing a missing portion with a metal casting is widely used. The shape of the teeth varies from person to person, and the size and shape of the missing part is not uniform. Therefore, in dental treatment, it is not possible to mass-produce a prosthesis that compensates for a missing part, and it is necessary to produce a prosthesis having a different shape depending on the case of each individual. Moreover, in order to obtain an exact occlusion, it is necessary to produce a prosthesis with high accuracy. Conventionally, a casting apparatus for dental technicians has been used to obtain an appropriate casting satisfying these requirements.

  In such a casting apparatus for dental technicians, a precious metal or non-noble metal material is melted by heating, and the molten metal is poured into a mold having a shape corresponding to a prosthesis. There are methods such as arc heating (see, for example, Patent Document 1), high-frequency induction heating (see, for example, Patent Document 2), and heater heating (see, for example, Patent Document 3).

  Arc heating and high frequency induction heating have the advantages that the metal temperature rises faster and the heating time is shorter than heater heating. On the other hand, since accurate temperature control is difficult, an operator (generally a dental technician) visually observes the melting state of the metal in the crucible and determines that the metal is sufficiently melted. Need to do. For this reason, a difference is likely to occur in the casting depending on the experience and skill of the operator. In addition, if casting is performed with insufficient melting, casting defects and insufficient casting occur, resulting in a defective product. Therefore, it takes time for subsequent processes such as polishing, and the work efficiency deteriorates.

  In contrast, heater heating tends to be longer in heating time than arc heating or high-frequency induction heating, but accurate temperature control is possible. It can be melted to an appropriate state and cast in that state. Therefore, there is a great advantage that a good casting can be produced with a high yield without greatly depending on the experience and skill of the operator.

  As described above, in a dental technician casting apparatus using heater heating, the temperature can be accurately controlled according to a preset temperature program. For example, in the commercially available inverted vacuum pressure casting apparatus for dental technicians described in Non-Patent Document 1, the following five parameters (1) to (5) can be set for the operation program including the temperature program. ing.

(1) Start temperature (preheating temperature) Ts
By preheating the inside of the heating furnace to a certain temperature lower than the melting point of the metal that is the casting material, the heating furnace can quickly reach the melting temperature after the heating for melting is started. A start temperature Ts is set as an initial temperature (preheating temperature) at the start. However, if the start temperature Ts is too close to the melting temperature, the crucible may be broken by a thermal shock when the ceramic crucible containing the metal material is stored in the heating furnace. Therefore, it is desirable that the start temperature Ts be close to the melting temperature in consideration of a temperature range in which the crucible is not broken.

(2) Melting temperature Tm
Generally, the melting temperature Tm is set about 100 to 150 ° C. higher than the liquidus temperature provided by the manufacturer of the metal that is the casting material. If the melting temperature Tm is set close to the liquidus temperature, it takes time until the metal in the crucible is completely melted, and the metal may oxidize during the process, which may cause casting defects. On the contrary, if the melting temperature Tm is set to a temperature much higher than the liquidus temperature, melting is performed rapidly, but the properties after casting change or the investment and the metal constituting the mold cause a chemical reaction to cause the casting. It may cause nests. Therefore, it is desirable to set the melting temperature Tm appropriately with respect to the liquid phase temperature of the metal used.

(3) Melting time tm
Even if the temperature of the heating furnace reaches the melting temperature Tm, the temperature of the molten metal in the crucible does not become the melting temperature Tm at that time, and the metal is not necessarily completely melted. Therefore, the metal is completely melted by maintaining the melting temperature Tm for an appropriate time, that is, the melting time tm. If the amount of metal used is large, the heat capacity is large, so the melting time tm needs to be increased accordingly.

(4) Casting timing tp
The mold temperature must be lower than the temperature of the molten metal. For this reason, the higher the melting point metal, the larger the difference from the mold temperature. Therefore, it is necessary to pressurize as soon as possible after the molten metal falls into the mold. However, if pressure is applied before the molten metal falls on the sprue (runner) of the mold, casting cannot be performed, so it is necessary to pressurize at an appropriate timing. In the casting apparatus described in Non-Patent Document 1, as described in Patent Document 3, the time point when the crucible and the mold are completely inverted and turned vertical is set to ± 0 as a reference, and the pressure is applied retroactively. The pressure start timing can be set with a negative value when starting the pressure, and a positive value when the pressure is started later in time. Specifically, the casting timing tp can be set in units of 100 milliseconds in both the minus and plus directions.

(5) Cooling time tc
In the case of a low melting point metal such as a silver alloy, if the inverted crucible and mold are immediately returned to their original positions after casting by pressurization, the metal that has not completely solidified may flow backward. Therefore, in order to prevent this, the cooling time tc is set to a time for completely heating the metal while the crucible and the mold are inverted and cooling the metal to cool it completely.

  As described above, in the conventional pressure casting apparatus, the five parameters of the start temperature Ts, the melting temperature Tm, the melting time tm, the casting timing tp, and the cooling time tc can be set, and these are set appropriately. By doing so, it is possible to reliably produce a good casting even if an inexperienced person performs actual work.

  However, in the case of routine or manual work using metal materials that are always used, casting can be performed without problems using parameters set in the past. In a situation where past parameters cannot be used as they are, such as when a new metal material that has never been used is used, an operator is required to obtain an appropriate parameter. Workers such as dental technicians are often unfamiliar with such work, so the above parameters are set while consulting with the person in charge of the manufacturer of the casting equipment and receiving appropriate advice. It's real.

JP 2002-96155 A Japanese Patent Laid-Open No. 11-285811 JP 2000-176629 A "KDF SUPER CASCOM", [online], Denken Co., Ltd. [searched July 5, 2005], Internet <URL: http://www.kdf.co.jp/english/products/sika/cascom/s_cascom .htm>

  That is, the conventional heater-heated dental technician casting apparatus as described above is capable of accurate temperature control, and therefore has a great advantage that a good casting can be produced with a high yield. The parameters to be input and set by the operator to perform such temperature control are difficult to understand, and it cannot be said that the workability and operability are sufficiently high. The present invention has been made to solve these problems, and the purpose of the present invention is to improve the workability and operability by making the items to be set easy for the worker to understand. An object of the present invention is to provide a casting apparatus for dental technicians.

The present invention, which has been made to solve the above problems, melts the metal by heating a crucible containing a metal as a casting material, and pours the molten metal into a mold to cool and solidify it. In a dental technician casting apparatus for producing a prosthesis,
a) input means for an operator to input information about at least the liquidus temperature of the metal used for casting and the weight of the metal;
b) Program creation means for creating an operation program for controlling a series of casting operations including a temperature program for heating the crucible based on the information input by the input means;
c) control means for controlling the casting operation according to the operation program or an operation program modified by an operator based on the operation program;
It is characterized by having.

  As one aspect of the casting apparatus for dental technicians according to the present invention, a container in which the crucible can be housed, and a mold is arranged so that the gate is facing above the opening of the crucible housed in the container. A chamber comprising a lid for holding the mold, a heating means for heating the crucible housed in the container, and a chamber for pouring molten metal into the mold by inverting the chamber upside down after the metal in the crucible is melted An inversion pressure casting apparatus comprising: a driving unit; and a pressurizing unit that pressurizes the inside of the chamber at the time of casting, wherein the operation program includes a temperature program when the crucible is heated by the heating unit, And a pressing timing by the pressing means for the reversing operation.

  In the dental technician casting apparatus according to the present invention, when the operator inputs the liquid phase temperature TL of the metal used in the casting operation and the weight (metal amount) M of the metal by the input means, the program creation means is determined. According to the algorithm, parameters necessary for determining the operation program as described above that had to be input in the conventional apparatus, that is, start temperature Ts, melting temperature Tm, melting time tm, casting timing tp, and cooling time tc. Parameters are automatically calculated and an operation program based on the parameters is created. The control means, for example, in accordance with the operation start instruction from the operator, each means responsible for casting according to the operation program, specifically, each part such as the heating means, the chamber driving means, and the pressurizing means as described above. Control and carry out casting.

  Regarding the information to be input by the operator, the liquidus temperature TL can be easily obtained by providing information from the metal manufacturer, and the amount of metal M is determined by the operator himself according to the size of the prosthesis to be manufactured. Therefore, it is known. Therefore, it is very easy for the operator to input these, and as in the case of inputting complicated parameters as in the past, it is necessary to perform complicated calculations or to seek advice from the manufacturer in charge of the casting equipment. do not have to. As a result, according to the casting apparatus for dental technicians according to the present invention, the workability of the dental prosthesis is greatly improved, and a good prosthesis that is less prone to error even for those who are unskilled in the work. Can be produced.

  In order to create an operation program, at least the liquid phase temperature TL and the weight M of the metal may be input. Preferably, the input means further inputs information on the type of the investment of the mold. The program creation means may be configured to create an operation program based on information on the type of investment material in addition to information on the liquid phase temperature of the metal and the weight of the metal.

  In practice, the effect of the type of investment material on the operating program is not so great, but due to the difference in properties such as chemical reaction with certain metals at high temperatures, depending on the type of investment material, By reflecting this information in the driving program, the quality of the prosthesis can be further improved.

  In order to produce a better prosthesis, it may be better to modify or change the automatically created operation program as described above, so the automatically created operation program can be appropriately modified or changed. It is desirable to provide a function.

Hereinafter, an inversion type vacuum pressure casting apparatus which is an embodiment of a casting apparatus for dental technicians according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of the main part inside the pressure casting apparatus of the present embodiment, and the inside of the chamber 10 is shown in a longitudinal sectional view.

  The chamber 10 is made of metal and includes a container portion 10a and a lid portion 10b, and both are connected by a hinge (not shown). An O-ring 11 is provided as a sealing material on the close contact surface between the container portion 10a and the lid portion 10b, and the inside of the chamber 10 is kept airtight in a state where both are brought into close contact and locked by a lock mechanism (not shown). A support base 12 made of a heat insulating material is disposed inside the container portion 10a, and a heater 14 is provided around the inner peripheral surface of a recess 13 formed in a substantially cylindrical shape at the center thereof. . The heater 14 is, for example, a heating wire heater made of platinum alloy or the like, or a ceramic heater made of silicon carbide or the like.

  A ceramic crucible retort 15 having a bottomed cylindrical shape is fitted into the recess 13, and a crucible 16 is detachably fitted inside thereof. A flange is formed at the upper edge of the crucible retort 15, and an upper support 17 made of a refractory material is provided so as to press the flange. A stopper piece 18 is provided on the upper support 17 so as to protrude and retract on the inner peripheral side. When the chamber 10 is inverted, the stopper piece 18 protrudes inward, and the position of the crucible 16 is regulated by abutting the open end edge portion (upper edge portion in FIG. 1) of the stopper piece 18. A temperature detection thermocouple 19 is provided in the space between the bottom surface of the recess 13 and the bottom surface of the crucible retort 15 so as to penetrate the support base 12, and thereby the temperature of the crucible 16 can be detected.

  A coil spring 20 is provided inside the top surface of the lid 10 b of the chamber 10, and the upper support 17 is pressed by pressing the upper surface of the mold 30 mounted with the conical crucible 31 facing downward with the coil spring 20. And the lower surface of the mold 30 are in close contact with each other. Although not shown in FIG. 1, the upper support 17 is not in contact with the casting mold 30 all around, and a flow path that connects the crucible 31 and the internal space of the chamber 10 is formed by being interrupted at a plurality of locations. . The entire periphery of the mold 30 is covered with a cylindrical metal ring 32, and a runner 33 and a cavity 34 communicating with a gate opening at the top of the crucible 31 are formed therein.

  A rotating shaft 21 extending horizontally is fixed to the container portion 10 a of the chamber 10, and the rotational driving force of the motor 22 is transmitted to the rotating shaft 21 via the motor pulley 23, the timing belt 24, and the pulley 25. Thereby, when the motor 22 is operated, the chamber 10 can be rotated around the rotation shaft 21. Moreover, the inside of the rotating shaft 21 is formed hollow, and serves as an air supply / exhaust passage 26 that communicates the inside of the chamber 10 with a vacuum pump and a gas introduction valve not shown in FIG.

  FIG. 2 is an electric system configuration diagram of the pressure casting apparatus of the present embodiment. The control unit 40 is mainly configured by a microcomputer including a CPU, RAM, ROM and the like. An operation unit 42 including a plurality of operation keys and a display unit 43 including a numerical value display are connected to the control unit 40, and the operator confirms the numerical values input by the operator with the display unit 43 while operating the operation unit 42. Input can be performed using the operation keys. Further, the control unit 40 includes a lid opening / closing switch 45 that detects the opening / closing of the lid 10 b of the chamber 10, a pressure sensor 46 that detects the pressure in the chamber 10, and a temperature sensor 47 that detects the temperature in the vicinity of the crucible 16 using the thermocouple 19. A predetermined detection signal is input from each of the rotational position sensors 48 that detect the rotational position of the chamber 10 when it rotates. Further, the control unit 40 controls the operations of the vacuum pump 49, the gas introduction valve 50, the motor 22, and the heater 14 through the load driving unit 44 in order to perform casting. Here, the vacuum pump 49 is for exhausting the air inside the chamber 10 to the outside through the air supply / exhaust passage 26, and the gas introduction valve 50 conversely passes the air or the air into the chamber 10 through the air supply / exhaust passage 26. It is provided for introducing an inert gas such as argon.

  As a characteristic configuration of the casting apparatus of this embodiment, the control unit 40 includes a program creation unit 41 as a function. Next, the program creation unit 41 will be described in detail. In this casting apparatus, the following three parameters are input and set instead of the five parameters conventionally required to be set at the operation unit.

(A) Liquid phase temperature TL of the metal material used
Which metal material is used is selected by the operator, and the liquid phase temperature of the metal is described in a manual provided by the metal manufacturer. Therefore, the liquid phase temperature TL is a parameter that can be easily known for the operator. Here, the liquidus temperature TL can be input in units of 1 ° C.
(B) Weight of metal material used (metal amount) M
The operator can easily determine how much metal is required for the prosthesis to be cast. For example, the weight of the wax contained in the mold can be measured and converted from the measured value. When casting precious metals, it is usually costly to use more metal than necessary, so it is normal for workers to be careful not to use more metal than necessary. is there. Here, the metal amount can be input in units of 1 g.
(C) Type of investment material used for mold Generally, either a gypsum-based or phosphate-based investment material is used depending on a liquid phase temperature TL of a metal material. Further, when casting a metal floor, an investment material for the metal floor is used. Thus, here the choices are 3 for gypsum, phosphate, or metal floors, but in any case these are the choice of the operator.

  The above three parameters are all easy to know about the casting work that the worker is going to perform. Therefore, unlike the five parameters such as temperature and time related to the operation program as described above, Almost no burden.

  The numerical value of the liquid phase temperature TL input by the operation unit 42, the numerical value of the weight M, and information on the selection of the investment material (any one of the above three) are given to the program creation unit 41 of the control unit 40, where Thus, five parameters necessary for the operation program are calculated by the following arithmetic processing.

(1) Start temperature Ts
Liquidus temperature TL <1200 ° C .: Ts = Liquid phase temperature TL−100 [° C.]
Liquidus temperature TL ≧ 1200 ° C .: Ts = 1100 [° C.]
(2) Melting temperature Tm
(A) When the investment material is a gypsum-based liquid phase temperature TL <1000 ° C .: Tm = TL × 1.08
1000 ° C. ≦ Liquid phase temperature TL <1100 ° C .: Tm = TL × 1.09
Liquidus temperature TL ≧ 1100 ° C .: Tm = TL × 1.10.
(B) When the investment material is phosphate-based Liquid phase temperature TL <1000 ° C .: Tm = TL × 1.08
1000 ° C. ≦ Liquid phase temperature TL <1100 ° C .: Tm = TL × 1.09
1100 ° C. ≦ Liquid phase temperature TL <1200 ° C .: Tm = TL × 1.10.
Liquidus temperature TL ≧ 1200 ° C .: Tm = TL × 1.12
(C) When the investment material is for a metal floor, regardless of the liquidus temperature TL Tm = TL × 1.12
However, when Tm by this calculation formula exceeds 1500 ° C., Tm = 1500 ° C.
In addition, when Tm becomes a decimal point in the calculation of the melting temperature Tm, it is rounded to an integer.

(3) Melting time tm
Metal amount M <10 g: tm = 3 minutes 11 g ≦ Metal amount M <20 g: tm = 4 minutes 21 g ≦ Metal amount M <30 g: tm = 5 minutes 31 g ≦ Metal amount M <40 g: tm = 6 minutes 41 g ≦ Metal amount M <50 g: tm = 7 minutes 51 g ≦ metal amount M <60 g: tm = 8 minutes 61 g ≦ metal amount M <70 g: tm = 9 minutes 71 g ≦ metal amount M <80 g: tm = 10 minutes 81 g ≦ metal amount M < 90 g: tm = 11 minutes 91 g ≦ amount of metal M <100 g: tm = 12 minutes

(4) Casting timing tp
(A) When the investment material is a gypsum system Liquid phase temperature TL <1050 ° C .: tp = + 0.3 seconds Liquid phase temperature TL ≧ 1050 ° C .: tp = + 0.2 seconds (b) The investment material is phosphate-based When there is no relation to the liquidus temperature TL tp = + 0.2 seconds (c) When the investment material is for a metal floor tp = −0.3 seconds irrespective of the liquidus temperature TL (5) Cooling time tc
Liquid phase temperature TL <800 ° C .: tc = 18 seconds per 1 g of metal amount 800 ° C. ≦ Liquid phase temperature TL <1200 ° C .: tc = 6 seconds per 1 M of metal amount Liquid phase temperature TL ≧ 1200 ° C .: tc = 3 per 1 M of metal amount M Second However, in the calculation of tc, after calculating by the above formula, 2 (seven) and three (eight) are added to the unit of 5 seconds.

  In the program creation processing unit 41, by performing the above calculation processing, the start temperature Ts, the melting temperature Tm, the melting temperature are based on the input information of the liquid phase temperature TL, the metal amount M, and the investment material selection information. Five parameters of time tm, casting timing tp, and cooling time tc are calculated, thereby creating an operation program. However, the above formulas for deriving the five parameters are examples, and for example, the same tendency as the magnitude relationship of the temperature, for example, the formula and the derivation method itself are not limited to the above description.

  FIG. 3 is a schematic diagram showing an example of an operation program created thereby as a temperature change (temperature program) and an execution operation over time during casting operation. The operation program automatically created in this way is set as the default in the control unit 40, but the operator corrects the operation program by appropriately modifying / changing the parameters by operation from the operation unit 42 as necessary. -It can be changed. With reference to FIG. 3, the casting operation by this casting apparatus will be described.

  When the operation program is determined as described above, the control unit 40 operates the heater 14 via the load driving unit 44 to raise the temperature detected by the temperature sensor 47 to the start temperature Ts and maintain the state. In this state, the worker stores a metal ingot in the crucible 16 and instructs the operation unit 42 to start melting. Then, a large heating current is supplied to the heater 14 according to an instruction from the control unit 40, the temperature is increased until the temperature detected by the temperature sensor 47 reaches the melting temperature Tm, and then maintained near the melting temperature Tm. At this time, since the temperature of the crucible 16 is sufficient to dissolve the metal, the metal ingot is melted and liquefied in the crucible 16.

  When the elapsed time after reaching the melting temperature Tm reaches the melting time tm, the control unit 40 notifies that the preparation of the molten metal is completed by a notification by a buzzer or a display. In response to this, the operator turns the mold 30 that has been heated to a temperature of, for example, about 600 to 900 ° C. upside down above the crucible 16 as shown in FIG. The lid 10b is closed and the chamber 10 is sealed. The closure of the lid 10b is notified to the controller 40 by the lid opening / closing switch 45. The mold 30 is strongly urged downward by the coil spring 20, and as shown in FIG. 1, the gate of the mold 30 and the opening surface of the crucible 16 face each other vertically.

  When the operator instructs the start of casting through the operation unit 42, the gas introduction valve 50 is closed and the vacuum pump 49 is operated according to the instruction from the control unit 40. Thereby, the air inside the chamber 10 is discharged to the outside through the air supply / exhaust passage 26, and the degree of vacuum in the chamber 10 is increased. Even during this vacuum suction period, the temperature of the crucible 16 is maintained at the previous melting temperature Tm. The pressure in the chamber 10 is monitored by the pressure sensor 46. When the pressure reaches a predetermined value, the motor 22 is driven by an instruction from the control unit 40, and the chamber 10 is rotated in the forward rotation direction from the upright position. When the fluidity of the molten metal in the crucible 16 is high, the molten metal flowing out from the inclined crucible 16 before the chamber 10 is completely inverted starts to be poured into the crucible 31 of the mold 30. The control unit 40 stops the operation of the vacuum pump 49 and opens the gas introduction valve 50 at a predetermined time point earlier by tp than the inverted position (slower depending on the setting of tp). Then, the compressed air rapidly flows into the chamber 10 through the air supply / exhaust passage 26, and the air flows into the crucible 31 through the gap between the open end of the crucible 16 and the mold 30. As a result, immediately after the molten metal flowing out of the crucible 16 flows into the crucible 31 and completely closes the gate, pressure by air is applied to the upper surface, and the molten metal flows smoothly into the cavity 34.

  Since the inside of the chamber 10 is maintained in a vacuum atmosphere until just before the introduction of the gas, the inside of the cavity 34 closed with the molten metal is in a vacuum state, and the molten metal is brought into the runner 33 due to the pressure difference from the air pressure on the upper surface side. Through and into the cavity 34. During this time, the inversion of the chamber 10 proceeds. When the chamber 10 reaches the inverted position, the control unit 40 that has received the detection signal from the rotation position sensor 48 stops the motor 22. Then, after a predetermined time has elapsed, the control unit 40 stops energizing the heater 14. When the energization of the heater 14 is stopped, the inside of the chamber 10 is naturally cooled, and the molten metal filled in the cavity 34 of the mold 30 starts to solidify.

  Then, when the cooling time tc elapses, the motor 22 is driven again by an instruction from the control unit 40, and the chamber 10 is rotated from the inverted position to the upright position in the direction opposite to the previous normal rotation direction. Since an appropriate cooling time tc corresponding to the type and amount of metal is set, when the chamber 10 is rotated again, the cast metal is solidified and does not flow backward. When the rotational position sensor 48 detects that the chamber 10 has reached the upright position, the motor 22 is stopped and the casting operation is completed. Thereafter, the operator opens the lid portion 10b of the chamber 10 and takes out the mold 30, waits for the mold 30 to cool down, pulls out the mold 30 from the metal ring 32, pulverizes the investment material, and takes out the cast metal. .

  As described above, in the casting apparatus according to the present embodiment, it is possible to perform appropriate casting according to the selected metal material, the amount of metal, and the like, without performing an unfamiliar and troublesome input operation by an operator. Can be made.

  It should be noted that the above embodiment is an example of the present invention, and it is obvious that modifications, changes, and additions as appropriate within the scope of the present invention are included in the scope of the claims of the present application.

The schematic block diagram of the principal part inside the casting apparatus which is one Example of this invention. The electric system block diagram of the pressure casting apparatus of a present Example. The schematic diagram which shows an example of the operation program produced by the pressure casting apparatus of a present Example as a temperature change (temperature program) with time passage at the time of casting operation, and execution operation.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Chamber 10a ... Container part 10b ... Cover part 11 ... O-ring 12 ... Support base 13 ... Recess 14 ... Heater 15 ... Crucible retort 16 ... Crucible 17 ... Upper support 18 ... Stopper piece 19 ... Thermocouple 20 ... Coil spring 21 ... rotary shaft 22 ... motor 23 ... motor pulley 24 ... timing belt 25 ... pulley 26 ... supply / exhaust passage 30 ... mold 31 ... crucible 32 ... metal ring 33 ... runner 34 ... hollow part 40 ... control part 41 ... program creation part 42 ... operation part 43 ... display part 44 ... load drive part 45 ... lid opening / closing switch 46 ... pressure sensor 47 ... temperature sensor 48 ... rotational position sensor 49 ... vacuum pump 50 ... gas introduction valve

Claims (3)

In a dental technician casting device for producing a dental prosthesis by heating a crucible containing a metal that is a casting material to melt the metal, pouring the molten metal into a mold, and cooling and solidifying it,
a) input means for an operator to input information about at least the liquidus temperature of the metal used for casting and the weight of the metal;
b) Program creation means for creating an operation program for controlling a series of casting operations including a temperature program for heating the crucible based on the information input by the input means;
c) control means for controlling the casting operation according to the operation program or an operation program modified by an operator based on the operation program;
A casting apparatus for dental technician, comprising: A chamber comprising a container capable of accommodating the crucible, a lid for holding the mold in a state in which the mold is arranged so that the gate faces the opening above the crucible accommodated in the container, and the container Heating means for heating the crucible contained therein, chamber driving means for pouring the molten metal into a mold by inverting the chamber upside down after the metal in the crucible is melted, and pressurizing means for pressurizing the chamber during casting A reversible pressure casting apparatus comprising:
2. The dental technician casting according to claim 1, wherein the operation program includes a temperature program when the crucible is heated by the heating unit, and a pressing timing by the pressing unit with respect to the reversing operation of the chamber. apparatus. The input means further inputs information on the type of investment material of the mold, and the program creation means relates to the type of investment material in addition to information on the liquid phase temperature of the metal and the weight of the metal. 3. The dental technician casting apparatus according to claim 1, wherein an operation program is created based on the information.

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