CN113853177A - Dental medical instrument and method for manufacturing same - Google Patents
Dental medical instrument and method for manufacturing same Download PDFInfo
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- CN113853177A CN113853177A CN202080037310.4A CN202080037310A CN113853177A CN 113853177 A CN113853177 A CN 113853177A CN 202080037310 A CN202080037310 A CN 202080037310A CN 113853177 A CN113853177 A CN 113853177A
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- 210000003298 dental enamel Anatomy 0.000 description 3
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- 239000011733 molybdenum Substances 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
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- 238000005422 blasting Methods 0.000 description 2
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- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
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Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61C—DENTISTRY; APPARATUS OR METHODS FOR ORAL OR DENTAL HYGIENE
- A61C3/00—Dental tools or instruments
- A61C3/02—Tooth drilling or cutting instruments; Instruments acting like a sandblast machine
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- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Dentistry (AREA)
- Epidemiology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention aims to provide a dental medical instrument which has high strength of a joint part of a handpiece and a shaft and can be additionally processed, and a manufacturing method thereof. The method for manufacturing a dental medical instrument (1) comprising a shaft (11) and a handpiece (12) is characterized in that a joint surface (11a) of the shaft (11) and a joint surface (12a) of the handpiece (12) are joined by means of electric diffusion joining. In this case, the joint surface of at least one of the shaft (11) and the head (12), preferably the joint surface having a relatively low electric resistance, is convex. In the diffusion bonding, current is applied to the bonding surface between the shaft (11) and the handpiece (12) so that the output of the power supply is controlled by the rising gradient. Thus, the dental medical instrument (1) can be provided in which the shaft (11) and the handpiece (12) are joined via a uniform diffusion layer, the strength of the joint (13) is high, and additional processing can be performed.
Description
Technical Field
The present invention relates to a dental medical instrument and a method for manufacturing the same.
Background
Conventionally, in dental treatment, a rotary drive device such as a handle (hand) as a medical cutting device is used to perform treatment for cutting an enamel or dentin portion of a tooth. On this handle mainly a cutting piece called a cemented carbide rod is mounted and used. The cemented carbide rod for dental technician dental use is excellent in durability, and therefore is used for cutting a wide range of dental materials such as plaster, resin, metal, and ceramics (for example, patent document 1).
The hard alloy rod mainly comprises the following components: a head having a blade formed on an outer periphery thereof by electric discharge machining or the like; and a shaft which is a rotation shaft of the head. The head is formed of cemented carbide or the like containing tungsten carbide as a main component. In addition, the shaft is formed of stainless steel or the like.
Here, the cemented carbide is difficult to be welded with dissimilar metals. Therefore, the cemented carbide rod is generally formed by grinding a cemented carbide to form a head and a shaft, or by brazing a shaft made of stainless steel to a head made of a cemented carbide.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open No. 2014-512893
Disclosure of Invention
Problems to be solved by the invention
Here, when the head and the shaft are integrally formed of cemented carbide, there is a problem that the material cost and the machining cost are increased. Further, when a head made of cemented carbide and a shaft made of stainless steel or the like are formed by brazing, there is a problem that if a cemented carbide rod is once produced, it is difficult to additionally process the head thereafter, because the strength of the brazed part is insufficient.
Accordingly, an object of the present invention is to provide a dental medical instrument and a method for manufacturing the same, which can improve the strength of a joint portion between a handpiece and a shaft formed of different metals and can perform additional processing.
Means for solving the problems
In order to achieve the above object, a dental medical device according to the present invention includes: it comprises a shaft and a handpiece, which are joined via a diffusion layer.
In this case, the thickness of the diffusion layer is preferably within 5 μm. The diffusion layer may be formed in a convex shape on at least one of the shaft and the head, and preferably, may be formed in a convex shape on the side having a higher electrical resistance.
In addition, the shaft is formed by using a 1 st metal, and the machine head is formed by using a 2 nd metal which is different from the shaft in material.
Further, a method for manufacturing a dental medical instrument including a shaft and a handpiece according to the present invention is characterized in that: joining the joining surface of the shaft and the joining surface of the head by an electrically conductive diffusion joint.
In this case, a joint surface of at least one of the shaft and the head may be convex, and preferably, a joint surface of the shaft and the head having a lower electrical resistance may be convex.
Further, preferably, the diffusion bonding is performed by applying current to a bonding surface between the shaft and the handpiece so that an output of a power supply is controlled by a rising slope (Upslope).
In the electrical diffusion bonding, the time for applying electricity to the shaft and the handpiece may be 90 seconds or less, and more preferably 30 seconds or less.
Further, a mode can be used in which the shaft is formed of a 1 st metal and the head is formed of a 2 nd metal having a different material from the shaft.
The diffusion bonding may be performed by applying current to a bonding surface between the shaft and the head, and performing diffusion bonding in a solid phase by resistance heat generation of the shaft and the head, or may be performed in a liquid phase.
Further, after the electrical diffusion bonding, the shape of the head can be processed.
Effects of the invention
Since the shaft and the head are joined by diffusion bonding, the strength is high, and thus additional processing after joining can be performed.
Drawings
Fig. 1 is a side view showing a dental medical instrument according to the present invention.
Fig. 2 is a schematic side view showing the handle.
Fig. 3 is a side view showing a shaft and a handpiece before the dental medical instrument of the present invention is manufactured.
Description of the reference numerals
1 dental medical instrument
2 handle
11 axle
11a bonding surface
12 machine head
12a bonding surface
13 joint part
Detailed Description
The dental medical instrument 1 of the present invention is used for cutting, grinding, trimming, etc. teeth, bones, prostheses (artificial teeth, etc.) in dental medicine, and mainly includes a shaft 11 and a handpiece 12 as shown in fig. 1. As the dental medical instrument 1, for example, a cemented carbide rod can be cited. As shown in fig. 2, the dental medical instrument 1 is used by being attached to a rotary drive device such as a handle 2 which is held by a hand and operated.
As shown in fig. 2, the shaft 11 is formed to be attachable to a jig of a rotation driving device and functions as a rotation shaft of the handpiece 12. The shaft 11 may have any shape as long as it can be rotatably attached to a jig of the handle 2, and a conventionally known general shape can be adopted.
In addition, the material of the shaft 11 is formed of metal (1 st metal). Since the shaft 11 is attached to the handle 2 and rotated, any metal, for example, a steel material such as stainless steel, may be used as long as it is not bent or distorted by the rotational force. Specifically, SUS201 can be mentioned, for example.
The handpiece 12 is a part that cuts, grinds, trims, and the like teeth or bones, prostheses (artificial teeth, etc.). The shape of the handpiece 12 may be any shape as long as it can cut a tooth formed of enamel, dentin, cementum, or the like, or a prosthesis formed of metal or the like, according to the purpose, and a conventionally known general shape can be adopted.
The head 12 is made of a metal (2 nd metal) having a different material from the shaft 11. Here, the metals different in material quality include not only metals different in composition but also metals different in properties even if the components are the same, such as metals formed by different quenching.
Any metal may be used for the handpiece 12 as long as it has a hardness capable of cutting teeth formed of enamel, dentin, cementum, or the like, or prostheses formed of metal or the like, and for example, cemented carbide, molybdenum steel, or high-speed steel may be used. Here, the cemented carbide is an alloy produced by sintering a powder of hard metal carbide, and examples thereof include tungsten carbide. If the head 12 is made of cemented carbide, the durability can be improved and good machinability can be maintained for a long period of time.
Further, the shaft 11 and the head 12 are diffusion bonded, and a diffusion layer formed of the 1 st metal and the 2 nd metal is provided at a bonding portion 13 of the shaft 11 and the head 12. Here, the diffusion bonding means bonding by atomic diffusion between bonding surfaces by pressurizing the bonding surface 11a of the shaft 11 and the bonding surface 12a of the head 12 to such an extent that plastic deformation does not occur as much as possible. In the diffusion bonding, a metal may be sandwiched between bonding surfaces for the purpose of promoting bonding or the like.
The diffusion layer is a layer in which the 1 st metal and the 2 nd metal are diffused into each other. In order to reduce deformation or structural change of the joint 13, the thickness of the diffusion layer may be 5 μm or less, preferably 3 μm or less, and more preferably 1 μm or less. In order to form such a thin diffusion layer, the above-described electric diffusion bonding is preferably used.
In addition, when the conductive diffusion bonding is used, it is necessary to control the flow of current. Therefore, the joint surface 11a of the shaft 11 and the joint surface 12a of the head 12 are preferably shaped as follows: at least one of the diffusion layers is convex, and is initially in contact with a point or a line, and the diffusion layers gradually expand and are joined when a current flows. In this case, the other bonding surface is preferably smooth to the extent that at least no voids are generated during diffusion bonding, such as a plane or a mirror surface. For example, as shown in fig. 3, the shape of the joint surface 11a of the shaft 11 and the joint surface 12a of the head 12 before joining may be configured such that one is formed in a convex shape and the other is formed in a flat shape. By performing the bonding in this manner, the diffusion layer gradually expands well from the apex of the convex portion in contact with the flat surface, and thus a flat and uniform diffusion layer can be formed. Therefore, the breaking strength of the joint portion 13 can be improved. It is needless to say that both the joint surface 11a and the joint surface 12a may be convex.
Further, since a member having a high electric resistance is more likely to generate heat, it is more likely to form a uniform diffusion layer by forming the joint surface of the shaft 11 and the head 12 having a low electric resistance in a convex shape.
The convex bonding surface means that the tip of the bonding surface is in a point shape or a linear shape, and may be, for example, a tapered shape or a spherical shape, or a triangular shape or an arch shape in cross section. The number of the convex portions may be only 1 or a plurality of convex portions on the joint surface. When a plurality of convex portions are formed on the bonding surface, a conventionally known method such as sand blasting, shot blasting, etching, or laser processing can be used. When the shaft 11 and the head 12 formed in this way are joined, the joint 13 has the following portions: the diffusion layer is formed in a convex shape on one or both of the shaft and the head. More preferably, the diffusion layer is formed in a shape in which the joint surface of the shaft 11 and the head 12 having a lower electrical resistance is convex and the joint surface of the head 12 having a higher electrical resistance is flat as described above, and more specifically, the diffusion layer is formed in a shape of convex in the shaft 11 and the head 12 having a higher electrical resistance. The number of the convex portions formed in the diffusion layer 13 may be plural.
Next, a method for manufacturing the dental medical instrument 1 of the present invention will be described. The method for manufacturing the dental medical instrument 1 of the present invention is characterized in that: the joint surface 11a of the shaft 11 and the joint surface 12a of the head 12 are joined by the electric diffusion joining.
Since the shape and material of the shaft 11 or the handpiece 12 are the same as those described above for the dental medical instrument 1, the same reference numerals are given to the same parts and the description thereof is omitted unless otherwise specified. As an example of the material, a head 12 made of cemented carbide and a shaft 11 made of stainless steel can be used.
As described above, the diffusion bonding is performed by bringing the bonding surface 11a of the shaft 11 and the bonding surface 12a of the head 12 into contact with each other, pressurizing the surfaces to such an extent that plastic deformation does not occur as much as possible, and by utilizing atomic diffusion occurring between the bonding surfaces 11a and 12 a. In the diffusion bonding, a metal may be sandwiched between bonding surfaces for the purpose of promoting bonding or the like.
In diffusion bonding, there are cases where diffusion bonding is performed in a solid phase and diffusion bonding is performed in a liquid phase. In the case of diffusion bonding in a solid phase, the shaft 11 and the head 12, or a metal sandwiched therebetween are bonded by diffusion while maintaining a solid phase state. In the case of diffusion bonding in a liquid phase, at least one of the shaft 11 and the head 12 or a metal sandwiched therebetween is once melted and then bonded by isothermal solidification by diffusion.
As a specific example of the diffusion bonding, a method of applying current to the bonding surface 11a of the shaft 11 and the bonding surface 12a of the head 12 and performing diffusion bonding in a solid phase or a liquid phase by resistance heat generation of the shaft 11 and the head 12 can be used. In this case, there are the following advantages: the joint portion 13 of the shaft 11 and the head 12 is less deformed, and precise joining can be achieved. Further, electric current may be applied to the joint surface 11a of the shaft 11 and the joint surface 12a of the head 12, and diffusion joining may be performed in a liquid phase by resistance heat generation of the shaft 11 and the head 12. In this case, there are the following advantages: the joining surfaces 11a and 12a are relatively simple in processing such as precision, and the joining pressure is small, and the adhesion of the joining surfaces is also promoted.
In addition, when the conductive diffusion bonding is used, it is necessary to control the flow of current. Therefore, the shape of the joint surface 11a of the shaft 11 and the joint surface 12a of the head 12 before joining is preferably as follows: at least one of the diffusion layers is convex, and the diffusion layers are initially brought into contact with each other at a point, and gradually expand to be joined when a current flows. In this case, the other bonding surface is preferably smooth to the extent that at least no voids are generated during diffusion bonding, such as a plane or a mirror surface. For example, as shown in fig. 3, the shape of the joint surface 11a of the shaft 11 and the joint surface 12a of the head 12 before joining may be configured such that one is formed in a convex shape and the other is formed in a flat shape. By performing the bonding in this manner, the diffusion layer gradually expands well from the apex of the convex portion in contact with the flat surface, and thus a flat and uniform diffusion layer can be formed. Therefore, the breaking strength of the joint portion 13 can be improved. It is needless to say that both the joint surface 11a and the joint surface 12a may be convex.
Further, since a member having a high electric resistance is more likely to generate heat, it is more likely to form a uniform diffusion layer by forming the joint surface of the shaft 11 and the head 12 having a low electric resistance in a convex shape.
The convex bonding surface means that the tip of the bonding surface is in a point shape or a linear shape, and may be, for example, a tapered shape or a spherical shape, or a triangular shape or an arch shape in cross section. The number of the convex portions may be only 1 or a plurality of convex portions on the joint surface. When a plurality of convex portions are formed on the bonding surface, a conventionally known method such as sand blasting, shot blasting, etching, or laser processing can be used. When the shaft 11 and the head 12 formed in this way are joined, the joint 13 has the following portions: the diffusion layer is formed in a convex shape on one or both of the shaft and the head. More preferably, as described above, the shape is formed when the joint surface of the shaft 11 and the head 12 having a lower electrical resistance is convex and the joint surface of the head 12 having a higher electrical resistance is flat, and more specifically, the shape of the diffusion layer is preferably convex on the side of the shaft 11 and the head 12 having a higher electrical resistance. In addition, a plurality of convex portions may be formed in the diffusion layer 13.
For diffusion bonding, for example, an electrically conductive diffusion bonding apparatus described below can be used. The electrical diffusion bonding apparatus is an apparatus for performing diffusion bonding by applying electricity to the shaft 11 and the head 12 which are to be brought into contact with each other at the bonding surfaces, and mainly includes an electrode, a power supply, a temperature information providing unit, an output control unit, and a pressurizing unit.
The electrodes are used to conduct electricity from the power source to the shaft 11 and handpiece 12. The electric diffusion bonding device has at least 2 electrodes for conducting electricity to the shaft 11 and the handpiece 12, and is provided, for example, in a portion facing each other across a bonding surface between the shaft 11 and the handpiece 12. Of course, depending on the material, shape, etc. of the shaft 11 and the handpiece 12, it is also possible to have 3 or more electrodes. The electrode may be made of any material as long as it can conduct electricity to the shaft 11 and the handpiece 12, and for example, copper, molybdenum, tungsten, or the like can be used. In addition, the electrode is connected to a power supply via a cable.
The power supply is used for outputting power to the plurality of electrodes. As the power supply, any power supply may be used as long as the output applied to the plurality of electrodes can be continuously changed, and for example, a known inverter power supply can be used.
The temperature information providing unit is used for providing the temperature information of the shaft 11, the handpiece 12 and the electrode to the output control unit. The temperature information may be information relating to the temperature of the shaft 11, the handpiece 12, or the electrode, may be information of the temperature itself, or may be information converted by calculation based on the temperature, such as a voltage value that determines a power supply voltage. As the temperature information providing unit, for example, a temperature sensor that detects the temperature of the shaft 11, the handpiece 12, and the electrode can be used. The temperature sensor may be any member as long as it can detect the temperature of the joining member or the electrode, and for example, a non-contact sensor which detects the temperature in a non-contact manner such as an infrared radiation thermometer or a contact sensor such as a thermocouple which detects the temperature by contacting the shaft 11 and the handpiece 12 or the electrode may be used. In addition, a non-contact sensor and a contact sensor can be used together.
Here, in the current diffusion bonding according to the present invention, it is preferable that the current is applied to the bonding surface between the shaft 11 and the handpiece 12 so that the output of the power supply is controlled with an increasing slope. Therefore, the output control unit preferably controls the output of the power supply with an increasing slope based on the temperature information from the temperature information providing unit. Conventionally, a constant current is passed for a constant time or a constant current is passed by ON/OFF control, and therefore the temperature of a current concentration portion may rapidly rise. In this case, the bonding state of the portion becomes liquid phase bonding or the like, and the bonding state of the bonding surface becomes uneven, resulting in irregularities in the bonding state. In contrast, in the rising slope control, since the current gradually rises, rapid current concentration can be suppressed, and the temperature of the bonding surface can be made uniform. Therefore, a uniform diffusion layer can be formed on the bonding surface, and the strength can be made uniform. In particular, as described above, when one of the joint surface 11a of the shaft 11 and the joint surface 12a of the head 12 before joining is formed in a convex shape and the other is formed in a flat shape, the current concentration can be suppressed and a more uniform diffusion layer can be formed.
The output control unit can also continuously control the output of the power supply with the rising gradient in real time based on the temperature information detected by the temperature sensor, and can realize detailed temperature management of the shaft 11 and the handpiece 12. Therefore, the joining strength of the joining surfaces of the joining members can be increased and the joining can be performed with less variation. Further, since such continuous control can maintain the thermal expansion constant as compared with the ON/OFF control, the influence of the pressure fluctuation due to the thermal expansion can be reduced.
The output control unit may be any device as long as it can control the output of the power supply with an increasing slope based on the temperature information from the temperature information providing unit, and for example, an operation unit and a display unit electrically connected to each other and configured by a CPU, a ROM, a RAM, an I/O, or the like can be used. Specifically, a known PID temperature control device such as a high-speed sampling temperature controller can be used. Here, the operation unit is configured by various operation switches such as a start switch and a start switch, an input board such as a touch panel, and the like. The information input from the operation unit is sent to the output control unit. The display unit 9 receives an input to the output control unit or information obtained based on the calculation result in the output control unit from the output control unit, and displays the information. Here, the display portion is constituted by a digital display panel, a lamp, and the like.
The case where the temperature of the shaft 11, the handpiece 12, and the electrode is obtained in real time by using the temperature sensor in the temperature information providing unit and the temperature information of the shaft 11, the handpiece 12, and the electrode is provided to the output control unit has been described. However, in the case of joining the shaft 11 and the head 12 of the same material in the same environment using the electrical diffusion joining apparatus, the same results were obtained with respect to the relationship between the elapsed time and the temperatures of the shaft 11, the head 12, and the electrode. Therefore, if temperature information indicating the relationship between the elapsed time and the temperature of the shaft 11, the handpiece 12, and the electrode is acquired in advance, the temperature information can be provided without using a temperature sensor. Therefore, the temperature information providing unit may be a temperature information storage unit that stores temperature information indicating a relationship between elapsed time of the shaft 11, the handpiece 12, and the electrode and the temperature of the shaft 11, the handpiece 12, and the electrode. Thus, the output control unit can control the output of the power supply based on the temperature information stored in the temperature information storage unit. The temperature information storage unit may be any device as long as it can store temperature information for determining the relationship between the elapsed time and the output of the power supply, and for example, a known memory or the like may be used.
The pressurization portion is used to apply pressure to the joint surface of the shaft 11 and the head 12. The pressing portion may be any structure as long as it can apply pressure to the joint surface of the shaft 11 and the head 12, and may be composed of, for example, a pressing member to which an electrode is fixed, a driving source for driving the pressing member, and a ball screw mechanism for transmitting a driving force of the driving source and moving the pressing member up and down.
The pressing member may be formed so as to conform to the shapes of the shaft 11 and the handpiece 12, and an intermediate member conforming to the shapes of the shaft 11 and the handpiece 12 may be interposed therebetween. The material of the pressing member may be any material as long as it has rigidity against the pressing pressure, and for example, a metal such as stainless steel, copper, molybdenum, or tungsten may be used.
Furthermore, the pressing member may also have a cooling unit for cooling the shaft 11 and the head 12. The cooling means may be any cooling means as long as it can cool the shaft 11 and the head 12, and may be configured to circulate a cooling fluid such as tap water through a flow path, for example. The flow path may be provided in the pressure member itself, or a cooling block having a flow path formed therein may be disposed in close contact with the pressure member.
The drive source can be, for example, a servomotor with a reduction gear. The servo motor is provided with an encoder and is arranged on the stand.
The ball screw mechanism includes the following members: a screw shaft extending in the vertical direction and having a thread groove formed on the outer circumferential surface; a nut having a thread groove formed on an inner peripheral surface thereof; and a plurality of balls accommodated between the screw grooves. The nut is fixed to the upper portion of the pressing member via an insulator formed of bakelite or the like and a pressure sensor. The screw shaft is connected to a rotation shaft of the servo motor via a reduction gear. The screw shaft is rotated by the rotation of the servo motor, and the nut and the pressing member move up and down relative to the screw shaft. When the driving of the servo motor is stopped, the position of the pressing member is maintained. At this time, the pressing portion restricts the displacement of the shaft 11 and the head 12, and applies pressure to the joint surface.
The pressure section may have a pressure sensor for detecting the pressure on the bonding surface. The pressure sensor is, for example, a one-axis load cell for measuring the pressure in the vertical direction, but a multi-axis pressure sensor may be used. By the pressure sensor, the pressure applied to the joint surface of the shaft 11 and the handpiece 12 to each other can be indirectly detected.
The pressing section may further include an elastic force applying unit that applies an elastic force to a joint surface between the shaft 11 and the head 12. For example, an elastic force applying unit is disposed between the base member on which the pressing member is disposed and the base of the electrical diffusion bonding apparatus. As the elastic force applying unit, for example, a spring; and a block for restricting the spring to a predetermined length shorter than the free length between the spring and the base member. Further, the pressing force acting on the shaft 11 and the head 12 from the base member pushed up by the elastic force applying unit can be changed by replacing the spring. With such a configuration, even if the shaft 11 and the head 12 thermally expand or contract, a rapid change in pressure acting on the joint surfaces can be alleviated.
The above-described configuration as the pressing portion has been described, but the pressing portion may have another configuration as long as it is a device for pressing the shaft 11 and the head 12 against each other on the joint surface. For example, a mode in which only weights are placed on the shaft 11 and the head 12 to press the shaft 11 and the head 12 against each other can also be used.
The electric heating bonding apparatus may further include a pressure control unit for controlling a pressure applied to the bonding surface. The pressure control unit is composed of, for example, a CPU, ROM, RAM, I/O, etc., and is electrically connected to an operation unit and a display unit. Here, the operation unit is configured by various operation switches such as a start switch and a start switch, an input board such as a touch panel, and the like. The information input from the operation unit is sent to the pressure control unit. The display unit receives an input to the pressure control unit or information obtained based on the calculation result of the pressure control unit from the pressure control unit and displays the information. Here, the display portion is constituted by a digital display panel, a lamp, and the like. In addition, the pressure control unit may use a device common to the output control unit.
Further, detection signals are input to the pressure control unit from the encoder, the pressure sensor, and the temperature sensor. The pressure control unit outputs control signals to the power supply and the servo motor based on these detection signals, information input from the operation unit, and control information such as the set pressure Ps, the lower limit set pressure Ps1, the set temperature Ts, and the set holding time Hs stored in the storage unit.
In the diffusion bonding using the above-described electric diffusion bonding apparatus, the bonding surfaces of the shaft 11 and the head 12 are brought into contact with each other, and the shaft 11 and the head 12 are heated by supplying electric current. This enables a diffusion layer to be formed on the joint surface between the shaft 11 and the head 12, and the joint to be performed. In order to prevent deformation of the joint 13 between the shaft 11 and the handpiece 12 and change in the metallic structure as much as possible, the energization time is preferably 90 seconds or less, and more preferably 30 seconds or less. Thus, the thickness of the diffusion layers of the shaft 11 and the head 12 can be set to 5 μm or less, preferably 3 μm or less, and more preferably 1 μm or less.
Here, the shaft 11 and the head 12 may be formed of the 1 st metal for the shaft 11 and the 2 nd metal for the head 12, which is different from the shaft 11 in material. Here, the metals different in material quality include not only metals different in composition, but also metals different in properties such as metals formed by different quenching even when the composition is the same. The metal for the shaft 11 or the head 12 may be selected according to cost or hardness.
In the diffusion bonding, current is applied to the bonding surface between the shaft 11 and the head 12, and the diffusion bonding may be performed in a solid phase or a liquid phase by resistance heat generation of the shaft 11 and the head 12.
In the method for manufacturing a medical device of the present invention, the shape of the handpiece 12 may be further processed after diffusion bonding the shaft 11 and the handpiece 12. In the medical instrument of the present invention, the shaft 11 and the handpiece 12 are firmly joined by diffusion joining, and therefore, the shape of the blade or the like of the handpiece 12 can be additionally processed. Therefore, the handpiece 12 to be diffusion bonded can be used not only as the handpiece 12 described in the above-described dental medical instrument 1, but also as the handpiece 12 that has been roughly machined before machining the handpiece 12.
Claims (15)
1. A dental medical instrument comprising a shaft and a handpiece,
the shaft and the handpiece are joined via a diffusion layer.
2. The dental medical device according to claim 1,
the thickness of the diffusion layer is within 5 μm.
3. The dental medical device according to claim 1 or 2,
the diffusion layer is formed in a convex shape on at least one of the shaft and the head.
4. The dental medical device according to claim 3,
the diffusion layer is formed in a convex shape on the side of the shaft or the head where the resistance is high.
5. The dental medical instrument according to any one of claims 1 to 4,
the shaft is made of a 1 st metal, and the machine head is made of a 2 nd metal which is made of a different material from the shaft.
6. A method of manufacturing a dental medical instrument comprising a shaft and a handpiece,
joining the joining surface of the shaft and the joining surface of the head by an electrically conductive diffusion joint.
7. The method of manufacturing a dental medical device according to claim 6,
a joint surface of at least one of the shaft and the head is convex.
8. The method of manufacturing a dental medical device according to claim 7,
a joint surface of the shaft and the head, the joint surface having a lower resistance, is convex.
9. The method for manufacturing a dental medical instrument according to any one of claims 6 to 8,
the diffusion bond energizes the interface of the shaft and the handpiece in a manner that controls the output of the power supply with an increasing slope.
10. The method for manufacturing a dental medical instrument according to any one of claims 6 to 9,
in the electrical diffusion bonding, a time for energizing the shaft and the handpiece is 90 seconds or less.
11. The method for manufacturing a dental medical instrument according to any one of claims 6 to 9,
in the electrical diffusion bonding, a time for energizing the shaft and the handpiece is 30 seconds or less.
12. The method for manufacturing a dental medical instrument according to any one of claims 6 to 11,
the shaft is made of a 1 st metal, and the machine head is made of a 2 nd metal which is made of a different material from the shaft.
13. The method for manufacturing a dental medical instrument according to any one of claims 6 to 12,
the diffusion bonding is performed in a solid phase by energizing a bonding surface between the shaft and the handpiece and generating heat by resistance of the shaft and the handpiece.
14. The method for manufacturing a dental medical instrument according to any one of claims 6 to 13,
the diffusion bonding is performed in a liquid phase by energizing a bonding surface between the shaft and the handpiece and generating heat by resistance of the shaft and the handpiece.
15. The method for manufacturing a dental medical instrument according to any one of claims 6 to 14,
machining the shape of the handpiece after the electrically conductive diffusion bonding.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019095573 | 2019-05-21 | ||
| JP2019-095573 | 2019-05-21 | ||
| PCT/JP2020/019943 WO2020235593A1 (en) | 2019-05-21 | 2020-05-20 | Dental device and production method therefor |
Publications (1)
| Publication Number | Publication Date |
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| CN113853177A true CN113853177A (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202080037310.4A Pending CN113853177A (en) | 2019-05-21 | 2020-05-20 | Dental medical instrument and method for manufacturing same |
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|---|---|
| JP (1) | JPWO2020235593A1 (en) |
| CN (1) | CN113853177A (en) |
| WO (1) | WO2020235593A1 (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB643816A (en) * | 1948-04-15 | 1950-09-27 | Gen Electric Co Ltd | Improvements in or relating to the welding of seams in metallic tubing |
| CN1041900A (en) * | 1988-10-15 | 1990-05-09 | 张悦仁 | Special metal pipe impact extrusion thermal diffusion welding technology |
| CA2052330A1 (en) * | 1991-09-26 | 1993-03-27 | Zvi Teumim-Stone | Laser apparatus for periodontal treatment |
| JPH0975373A (en) * | 1995-09-13 | 1997-03-25 | Manii Kk | Carbide bar and its production |
| JP2004216410A (en) * | 2003-01-14 | 2004-08-05 | Takeshi Honda | Cutting tool and its manufacturing method |
| WO2009107595A1 (en) * | 2008-02-29 | 2009-09-03 | マニー株式会社 | Dental cutting tool |
| WO2009107594A1 (en) * | 2008-02-29 | 2009-09-03 | マニー株式会社 | Method for connecting cemented carbide and stainless steel |
| US20120214125A1 (en) * | 2011-02-18 | 2012-08-23 | Ss White Burs, Inc. | Endodontic burs, kits, and methods for using endodontic burs |
| CN103002827A (en) * | 2010-06-30 | 2013-03-27 | 马尼株式会社 | Medical cutting instrument |
| US20140061185A1 (en) * | 2010-12-14 | 2014-03-06 | Paul Schindele | Method for joining workpieces by using a joining element and heating the joining element and the workpieces |
| KR20160000974A (en) * | 2014-06-25 | 2016-01-06 | 조선대학교산학협력단 | Tool and manufacturing method of the same |
-
2020
- 2020-05-20 CN CN202080037310.4A patent/CN113853177A/en active Pending
- 2020-05-20 WO PCT/JP2020/019943 patent/WO2020235593A1/en active Application Filing
- 2020-05-20 JP JP2021520817A patent/JPWO2020235593A1/ja active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB643816A (en) * | 1948-04-15 | 1950-09-27 | Gen Electric Co Ltd | Improvements in or relating to the welding of seams in metallic tubing |
| CN1041900A (en) * | 1988-10-15 | 1990-05-09 | 张悦仁 | Special metal pipe impact extrusion thermal diffusion welding technology |
| CA2052330A1 (en) * | 1991-09-26 | 1993-03-27 | Zvi Teumim-Stone | Laser apparatus for periodontal treatment |
| JPH0975373A (en) * | 1995-09-13 | 1997-03-25 | Manii Kk | Carbide bar and its production |
| JP2004216410A (en) * | 2003-01-14 | 2004-08-05 | Takeshi Honda | Cutting tool and its manufacturing method |
| WO2009107595A1 (en) * | 2008-02-29 | 2009-09-03 | マニー株式会社 | Dental cutting tool |
| WO2009107594A1 (en) * | 2008-02-29 | 2009-09-03 | マニー株式会社 | Method for connecting cemented carbide and stainless steel |
| CN103002827A (en) * | 2010-06-30 | 2013-03-27 | 马尼株式会社 | Medical cutting instrument |
| US20140061185A1 (en) * | 2010-12-14 | 2014-03-06 | Paul Schindele | Method for joining workpieces by using a joining element and heating the joining element and the workpieces |
| US20120214125A1 (en) * | 2011-02-18 | 2012-08-23 | Ss White Burs, Inc. | Endodontic burs, kits, and methods for using endodontic burs |
| KR20160000974A (en) * | 2014-06-25 | 2016-01-06 | 조선대학교산학협력단 | Tool and manufacturing method of the same |
Non-Patent Citations (1)
| Title |
|---|
| 大橋 修: "拡散接合 その１ 拡散接合の現状と拡散接合の実用例", 《まてりあ 》, vol. 57, no. 09, 1 September 2018 (2018-09-01), pages 443 - 447 * |
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| WO2020235593A1 (en) | 2020-11-26 |
| JPWO2020235593A1 (en) | 2020-11-26 |
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