A multi-punch die-casting device for dental porcelain casting furnace

Abstract

The present invention belongs to the field of oral denture technician repair equipment, and in particular, relates to a multi-punch die-casting device for a dental porcelain casting furnace. The multi-punch die-casting device for a dental porcelain casting furnace has a furnace chamber with top and bottom openings; the bottom opening of the furnace chamber is closed by a furnace chamber bottom plate; a furnace core is placed in the furnace chamber; the furnace core is a structure with top and bottom openings; the top of the furnace core is in contact with the inner lining top plate in the furnace chamber; a sand mold for a part to be cast is arranged in the furnace core; the sand mold for a part to be cast is arranged on the top of the furnace door; the sand mold for a part to be cast has a mold cavity; the top of the mold cavity has a plurality of die-casting holes connected thereto, and a hot-die-casting ceramic block is placed in each die-casting hole; a punch is placed on the top of each hot-die-casting ceramic block; there is a space for the punch to rise between the top of the punch and the bottom surface of the inner lining top plate in the furnace chamber; the furnace door is a structure that can be raised and lowered relative to the furnace chamber. The present invention has the characteristics of simple and convenient operation and high die-casting precision.

Description

Technical Field

[0001] The invention belongs to the field of oral denture technician repair equipment, and in particular relates to a multi-punch die-casting device for a dental porcelain casting furnace. Background Art

[0002] With the development of technology, the application of cast porcelain teeth in the field of dental restoration has become more and more extensive. Cast porcelain teeth, also known as cast ceramic crowns, are made of castable ceramic materials. Different from traditional metal porcelain teeth, the color of cast porcelain teeth is closer to real teeth. At the same time, cast porcelain teeth do not contain metal, which can avoid the irritation of the metal inner crown of porcelain teeth to the gums.

[0003] Cast porcelain teeth need to be formed in a high temperature environment. During the casting process, not only a certain amount of pressure needs to be applied, but also a certain degree of vacuum needs to be maintained. The prior art uses a punch rod installed on the top of the furnace, which penetrates the furnace top plate from the top of the furnace and directly penetrates into the high-temperature heating zone inside the furnace. During die-casting, the punch rod penetrates into the die-casting hole in the center of the workpiece to be cast placed in the furnace to die-cast the hot die-casting material in the hole. The die-casting hole and the punch rod have the same diameter size, and the punch rod must be concentrically aligned with the die-casting hole. The deficiencies of the above-mentioned prior art mainly include the following three aspects:

[0004] First, the existing technology punch rod sealing material is prone to failure at high temperatures and has a short lifespan; the existing technology uses a ceramic punch rod to penetrate the top of the furnace, and die-casts the workpiece to be die-cast in the furnace at high temperature. Since the punch rod directly penetrates the high-temperature furnace to die-cast the workpiece, the punch rod is heated in the high-temperature area of ​​the furnace, and the temperature of the punch rod is extremely high, causing the punch rod sealing material in close contact with the punch rod to fail at high temperatures, so that the entire furnace cannot reach the vacuum environment required for ceramic tooth casting, resulting in casting failure. The existing technology partially designs the top to install fans, heat sinks and other devices to dissipate heat, but since the punch rod sealing material is in direct contact with the high-temperature punch rod, the actual heat dissipation effect is not ideal.

[0005] Second, the above-mentioned prior art has high requirements on the placement of the die-cast workpiece and is not easy to operate. First, the workpiece to be die-cast is placed on the furnace base, and then the furnace and the furnace base are closed by the power device, and finally the punch rod that runs through the top of the furnace is used to die-cast the center die-casting hole of the workpiece to be cast on the base. This operation must ensure that the center die-casting hole of the workpiece to be cast placed on the base and the punch rod that runs through the top are concentric. If there is a concentric deviation between the center of the die-casting hole of the workpiece to be cast and the punch rod, the punch rod will not be able to accurately enter the die-casting hole, resulting in die-casting failure.

[0006] Third, as in the above-mentioned prior art, only one punch is used to die-cast the central die-casting hole of the workpiece. When a larger workpiece is die-cast, the casting channel is too long and the fluidity of the die-casting material is poor, which easily causes casting failure. Summary of the invention

[0007] In order to solve the above technical problems, the purpose of the present invention is to provide a multi-punch die-casting device for a dental porcelain casting furnace.

[0008] To achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A multi-punch die-casting device for a dental porcelain casting furnace, the die-casting device having a furnace chamber, the furnace chamber being a structure with top and bottom openings; the bottom opening of the furnace chamber being closed by a furnace chamber bottom plate; a furnace core being placed in the furnace chamber; the furnace core being a structure with top and bottom openings; the top of the furnace core being in contact with an inner lining top plate in the furnace chamber; a sand mold for a workpiece to be cast being arranged in the furnace core; the sand mold for the workpiece to be cast being arranged on the top of a furnace door; a mold cavity being arranged in the sand mold for the workpiece to be cast; a plurality of die-casting holes being connected to the mold cavity being arranged on the top of the mold cavity; Holes, and a hot-die casting ceramic block is placed in each of the die-casting holes; a punch rod is placed on the top of each of the hot-die casting ceramic blocks; the top of the punch rod protrudes from the top surface of the sand mold and is lower than the top surface of the furnace core, that is, there is a space for the punch rod to rise between the top of the punch rod and the bottom surface of the lining top plate in the furnace; the furnace door is a structure that can be raised and lowered relative to the furnace, and the furnace door moves relative to the furnace, and when the punch rod contacts the bottom surface of the lining top plate, the force between the lining top plate and the punch rod is used for die casting.

[0010] Corresponding to the furnace door, a driving mechanism is provided to drive the furnace door and the sand mold of the workpiece to be cast to rise and fall in the furnace core; the driving mechanism has an inner tray for supporting the furnace door; the furnace door is made of heat-insulating material, which separates the high-temperature area of ​​the furnace and the inner tray;

[0011] The inner tray is connected to the power part through a push rod arranged at the bottom of the outer side of the furnace. Under the action of the power part, the push rod pushes the inner tray, furnace door, sand mold and punch rod upward. When the punch rod moves upward and contacts the bottom surface of the inner lining top plate, the reaction force of the inner lining top plate to prevent the punch rod from moving upward is used for die casting.

[0012] A motor for driving the furnace to rise and fall is provided corresponding to the furnace; the furnace descends, so that the furnace bottom plate is tightly connected with the outer tray when the furnace descends.

[0013] The furnace comprises a shell and a lining; the shell has a furnace shell in a frame structure with openings at the upper and lower ends; the top and bottom of the furnace shell are respectively closed by a furnace top plate and a furnace bottom plate; the furnace bottom plate has a through hole for the furnace door to pass through; the furnace is a structure that can be raised and lowered by the furnace lifting motor; the furnace bottom plate and the outer tray are tightly connected with the outer tray when the furnace descends; the lining comprises a furnace lining located on the left and right sides of the furnace core and the lining top plate; a furnace lining with an opening at the lower end is formed between the furnace lining on the left and right sides and the lining top plate.

[0014] The shell of the furnace is provided with an exhaust hole, and the exhaust hole provides a high temperature and vacuum environment for casting porcelain teeth through a vacuum device.

[0015] A ceramic plate is arranged between the inner lining top plate and the furnace core.

[0016] A heating body is arranged in the furnace core.

[0017] The power part has a power element for providing the push rod with rising or falling power; a guide rod nut flange is installed on the screw of the power element; the guide rod nut flange and the transmission flange are fixedly connected, and a pressure sensor is installed between the transmission flange and the push rod. The power element transmits force to the push rod through the transmission flange, and the push rod pushes the inner tray to rise and fall, and the pressure value obtained by the pressure sensor is used to adjust the speed and value of the force applied by the power device to ensure the die-casting effect of the workpiece.

[0018] A guiding mechanism is provided corresponding to the push rod; the guiding mechanism comprises an upper guide rod support and a lower guide rod support; the upper guide rod support is fixedly mounted on the pallet base; a plurality of guide rods are installed between the upper guide rod support and the lower guide rod support, and guide sleeves are sleeved on the guide rods, and the guide sleeves are connected together through guide rod couplings and transmission flanges to ensure that the movement direction of the push rod is parallel to the guide rod; the pallet base is fixedly connected to the base through a left bracket and a right bracket.

[0019] The power element is a motor or a cylinder or an electric push rod which can rotate forward and reverse.

[0020] The present invention provides a multi-punch die-casting device for a porcelain casting furnace, which adopts the above technical solution and has the following beneficial effects:

[0021] First, in order to solve the problem that the sealing material of the punch rod in the prior art has a short life and is prone to high temperature failure, resulting in the inability to maintain vacuum, the present invention adopts an upward push-up device designed from the lower position of the furnace door at the bottom of the furnace to push the furnace door carrying the workpiece to be pressed to move into the furnace. When the tops of several punch rods placed in the die-casting holes on the upper part of the workpiece to be pressed contact the lower end surface of the furnace top, the reaction force of the furnace top to prevent the workpiece from moving upward is used for die casting; the push rod that pushes the furnace door upward is always away from the high-temperature heating zone of the furnace, so the temperature of the push rod is not high, and its sealing material can be effectively used for a long time, thereby ensuring the vacuum inside the furnace.

[0022] Secondly, the existing technology has the problem of the accuracy requirement of the placement of the workpiece to be pressed. The present invention places a number of punches in the center die-casting hole of the workpiece to be pressed before the workpiece to be pressed enters the furnace, which is easy to operate. In addition, a ceramic flat plate is set on the lower end surface of the top of the furnace. When the short punch in the center hole of the workpiece die-casting contacts the ceramic plate on the top of the furnace, under the reaction force, any contact point of the entire flat ceramic plate can push the punch; in this way, there is no requirement for the accuracy of the placement of the workpiece to be pressed.

[0023] Finally, for larger die-cast workpieces, the present invention adopts a solution of simultaneous die-casting with multiple punches, that is, a number of die-casting holes can be set on the top of the workpiece to be pressed as needed, and a punch is placed in each die-casting hole. This increases the die-casting channel, which is easier to succeed than the existing single-channel die-casting, and solves the disadvantage of the prior art that only one punch can be used for die-casting.

[0024] To sum up, the present invention solves the problems in the prior art equipment, such as the punch rod penetrating the top of the furnace entering the high temperature zone of the furnace, causing the punch rod sealing material to fail at high temperature, furnace vacuum leakage, and high workpiece placement accuracy requirements making it difficult to operate; single punch rod die casting causes casting of larger workpieces to fail easily; in particular, the multi-punch method design provides a new design method that cannot be solved by the prior art solution (which can only use one punch rod for die casting), and has the characteristics of simple and convenient operation and high die casting accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0026] Figure 2 It is a cross-sectional schematic diagram of the present invention.

[0027] In the figure: 1. left bracket; 2. base; 3. motor bracket; 4. power element; 5. guide rod lower support; 6. right bracket; 7. guide rod nut flange; 8. transmission flange; 9. guide rod; 10. guide sleeve; 11. guide rod connector; 12. pressure sensor; 13. push rod; 14. tray base; 15. outer tray bracket; 16. outer tray; 17. furnace bottom plate; 18. shell; 19. furnace top plate; 20. Lined top plate; 21. Ceramic plate; 22. Punch rod; 25. Hot die casting ceramic block; 26. Sand mold for casting; 27. Cavity; 28. Heating element; 29. ​​Furnace core; 30. Furnace door; 31. Furnace chamber lining; 32. Inner tray; 33. Flange sealing ring; 34. Push rod sealing ring 1; 35. Outer tray sealing ring; 36. Push rod sealing ring 2; 37. Sealing flange; 38. Guide rod upper support; 39. Exhaust hole. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present invention and refer to the accompanying drawings to clearly, detailedly and completely describe the technical solutions in the embodiments of the present invention. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0029] Reference Figure 1 A three-dimensional schematic diagram of an embodiment of the present invention, Figure 2 Cross-sectional view of the embodiment. For ease of understanding, the outer casing of the porcelain casting furnace and the furnace lifting device of the porcelain casting furnace are hidden in the figure. As shown in the figure, the multi-punch porcelain casting furnace die-casting device includes a ceramic plate 21, a heating device 28, a furnace door 30 for carrying the casting, an inner tray 32, an outer tray 16, a push rod 13, a plurality of punches 22, a sealing flange 37, a pressure sensor 12, a transmission flange 8, and an inner tray drive motor 4.

[0030] The furnace shell is composed of a furnace top plate 19, a furnace shell 18, a furnace bottom plate 17, an outer tray 16, etc., which contains a furnace lining 31 of heat-insulating materials, a lining top plate 20, a furnace core 29, a furnace door 30, a heating body 28, a ceramic plate 21, and a connection assembly to form a heating furnace. Under the action of a furnace lifting motor not shown, the furnace descends, so that the furnace bottom plate 17 and the outer tray 16 are tightly connected by the outer tray sealing ring 37. The sealing flange 37 forms a closed furnace cavity with the above-mentioned furnace components through the flange sealing ring 33, the push rod sealing ring 34 and 36. Combined with the vacuum device not shown, a high temperature and vacuum environment can be provided for the casting of cast porcelain teeth through the exhaust hole 39.

[0031] The push rod 13 pushes the inner tray 32 fixedly connected thereto to hold the furnace door 30 and the sand mold (casting ring) 26 carried by it to move toward the upper part of the furnace. When the tops of the plurality of punches 22, 23, 24 (one or more punches) placed in the die-casting hole of the sand mold (casting ring) 26 contact the lower end plane of the ceramic plate 21, under the reaction force applied by the ceramic plate 21, the punch pushes the hot die-casting ceramic block 25 into the cavity 27 of the sand mold (casting ring) 26 and fills it, thereby realizing die-casting. The material to be processed in the present invention includes the hot die-casting ceramic block material filled in the sand mold.

[0032] Specifically, refer to Figure 1 , Figure 2 , respectively showing a three-dimensional schematic diagram and a cross-sectional schematic diagram of the present invention. As shown in the figure, the push rod 13 passes through the outer tray 16 and is fixedly connected to the inner tray 32. The push rod 13 and the outer tray 16 are sealed by a sealing flange 37, wherein the sealing flange 37 is fixedly connected to the outer tray 16, and the contact surface between the two is sealed by a flange sealing ring 33; preferably, the push rod 13 and the sealing flange 37 are sealed by a plurality of push rod sealing rings 34, 36 installed in the sealing flange 37. Of course, the sealing ring can also be set on the push rod 13, and the inner tray 32 can also be a complete workpiece with the push rod.

[0033] Preferably, a heat-insulating furnace door 30 is placed on the inner tray 32 to isolate the high-temperature area of ​​the furnace from the inner tray, so as to reduce the influence of heat conduction such as heat radiation on the push rod 13 and the flange sealing ring 33, push rod sealing rings 34, 35, so that the sealing material can be used effectively for a long time, thereby ensuring that the furnace vacuum will not leak due to the failure of the sealing material at high temperature.

[0034] The preferred ceramic plate 21 is placed on the top of the furnace lining 31 of the furnace heat insulation material. When the push rod 13 pushes the inner tray 32 and the furnace door 30 above it to move toward the upper part of the furnace, the sand mold (casting ring) 26 on the furnace door 30 will move toward the top of the furnace with the furnace door 30. As the furnace door 30 rises, several punches 22, 23, 24, etc. placed in the die-casting holes of the sand mold (casting ring) 26 contact the lower end surface of the ceramic plate 21. The ceramic plate 21 prevents the punches 22, 23, 24 from moving upward, thereby applying force to them to achieve hot pressing casting of the workpiece. It is preferred to use a ceramic plate 21 with higher hardness and strength as a component that contacts and applies a reaction force with several punches 22, 23, 24, etc. Of course, the integral lining top plate 20 or other materials can also be used as a component that applies a reaction force.

[0035] Preferably, in the present embodiment, the power device for providing the push rod 13 with the power to rise or fall is a forward and reverse motor 4. Of course, a cylinder or an electric push rod may also be used.

[0036] Preferably, a guide rod nut flange 7 is installed on the screw of the inner tray driving motor 4 that provides the power device for the push rod 13. The guide rod nut flange 7 is fixedly connected to the transmission flange 8. A pressure sensor 12 is installed between the transmission flange 8 and the push rod 13. The power device transmits the force to the push rod through the transmission flange 8, and the push rod pushes the inner tray up and down. The pressure value obtained by the pressure sensor 12 adjusts the speed and value of the force applied by the power device to ensure the die-casting effect of the workpiece

[0037] Preferably, in this embodiment, the outer tray 16 is connected to the outer tray bracket 15 through a buffer element, and the inner tray 32 can be pushed by the push rod 13 to achieve lifting. Of course, this method can also be modified to the inner tray 32 being fixed, and the outer tray 16 descending together with the furnace, so that the furnace door rises relative to the furnace to achieve die casting.

[0038] Preferably, before the push rod 13 is about to push the furnace door 30 upward or during die casting, the vacuum device (not shown) can provide a vacuum environment for the furnace through the exhaust hole 39. Under the action of atmospheric pressure, the entire furnace is sealed and combined through the furnace bottom plate 17 and the outer tray 16 by the sealing material on the outer tray 16 to form a complete vacuum furnace. During die casting, the atmospheric pressure is used to keep the furnace bottom plate 17 and the outer tray 16 to form a closed cavity and not separate due to the force of die casting.

[0039] Preferably, the guide rod lower support 5 is fixedly mounted on the motor support 3, and the guide rod upper support 38 is fixedly mounted on the tray base 14, and a plurality of guide rods 9 are installed between the two, and the guide rods are sleeved with guide sleeves 10, and the guide sleeves 10 are connected together through the guide rod connector 11 and the transmission flange 8 to ensure that the movement direction of the push rod 13 is parallel to the guide rod. The left bracket 1 and the right bracket 6 together fix the tray base 14 and the base 2 together.

[0040] It should be noted that the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), and the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0041] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0043] The embodiments described above are only some of the embodiments of the present invention, but the invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A multi-punch die-casting device for dental porcelain casting furnace, characterized in that: The die-casting device has a furnace, the furnace is a structure with top and bottom openings; the bottom opening of the furnace is closed by a furnace bottom plate; a furnace core is placed in the furnace; the furnace core is a structure with top and bottom openings; the top of the furnace core is in contact with the top plate of the inner lining in the furnace; a sand mold of a workpiece to be cast is arranged in the furnace core; The sand mold of the workpiece to be cast is arranged on the top of the furnace door; the sand mold of the workpiece to be cast has a cavity; the top of the cavity has a plurality of die-casting holes connected thereto, and a hot-die-casting ceramic block is placed in each of the die-casting holes; a punch is placed on the top of each of the hot-die-casting ceramic blocks; the top of the punch protrudes from the top surface of the sand mold and is lower than the top surface of the furnace core, that is, there is a space for the punch to rise between the top of the punch and the bottom surface of the lining top plate in the furnace; the furnace door is a structure that can be raised and lowered relative to the furnace, and the furnace door moves relative to the furnace, and when the punch contacts the bottom surface of the lining top plate, the force between the lining top plate and the punch is used for die casting.

2. A multi-punch die-casting device for a dental porcelain casting furnace as claimed in claim 1, characterized in that: Corresponding to the furnace door, a driving mechanism is provided to drive the furnace door and the sand mold of the workpiece to be cast to rise and fall in the furnace core; the driving mechanism has an inner tray for supporting the furnace door; the furnace door is made of heat-insulating material, which separates the high-temperature area of ​​the furnace and the inner tray; The inner tray is connected to the power part through a push rod arranged at the bottom of the outer side of the furnace. Under the action of the power part, the push rod pushes the inner tray, furnace door, sand mold and punch rod upward. When the punch rod moves upward and contacts the bottom surface of the inner lining top plate, the reaction force of the inner lining top plate to prevent the punch rod from moving upward is used for die casting.

3. A multi-punch die-casting device for dental porcelain casting furnace according to claim 1, characterized in that: A motor for driving the furnace to rise and fall is provided corresponding to the furnace; the furnace descends, so that the furnace bottom plate is tightly connected with the outer tray when the furnace descends.

4. A multi-punch die-casting device for dental porcelain casting furnace according to claim 1, characterized in that: The furnace comprises a shell and a lining; the shell has a furnace shell in a frame structure with openings at the upper and lower ends; the top and bottom of the furnace shell are respectively closed by a furnace top plate and a furnace bottom plate; the furnace bottom plate has a through hole for the furnace door to pass through; the furnace is a structure that can be raised and lowered by the furnace lifting motor; the furnace bottom plate and the outer tray are tightly connected with the outer tray when the furnace descends; the lining comprises a furnace lining located on the left and right sides of the furnace core and the lining top plate; a furnace lining with an opening at the lower end is formed between the furnace lining on the left and right sides and the lining top plate.

5. A multi-punch die-casting device for dental porcelain casting furnace as claimed in claim 4, characterized in that: The shell of the furnace is provided with an exhaust hole, and the exhaust hole is connected through a vacuum device to provide a high temperature and vacuum environment for casting porcelain teeth.

6. A multi-punch die-casting device for dental porcelain casting furnace according to claim 1, characterized in that: A ceramic plate is arranged between the inner lining top plate and the furnace core.

7. A multi-punch die-casting device for dental porcelain casting furnace according to claim 1, characterized in that: A heating body is arranged in the furnace core.

8. A multi-punch die-casting device for dental porcelain casting furnace as claimed in claim 2, characterized in that: The power part has a power element for providing the push rod with rising or falling power; a guide rod nut flange is installed on the screw of the power element; the guide rod nut flange and the transmission flange are fixedly connected, and a pressure sensor is installed between the transmission flange and the push rod. The power element transmits force to the push rod through the transmission flange, and the push rod pushes the inner tray to rise and fall, and the pressure value obtained by the pressure sensor is used to adjust the speed and value of the force applied by the power device to ensure the die-casting effect of the workpiece.

9. A multi-punch die-casting device for a dental porcelain casting furnace as claimed in claim 8, characterized in that: A guiding mechanism is provided corresponding to the push rod; the guiding mechanism comprises an upper guide rod support and a lower guide rod support; the upper guide rod support is fixedly mounted on the pallet base; a plurality of guide rods are installed between the upper guide rod support and the lower guide rod support, and guide sleeves are sleeved on the guide rods, and the guide sleeves are connected together through guide rod couplings and transmission flanges to ensure that the movement direction of the push rod is parallel to the guide rod; the pallet base is fixedly connected to the base through a left bracket and a right bracket.

10. A multi-punch die-casting device for dental porcelain casting furnace according to claim 8, characterized in that: The power element is a motor that can rotate forward and reverse.

11. A multi-punch die-casting device for dental porcelain casting furnace according to claim 8, characterized in that: The power element is a cylinder or an electric push rod.

Images