Seiko Epson Corporation

Injex Corporation

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Matsumoto Dental College

Masaaki Sakata

Junichi Hayashi

Kenichi Shimodaira

Michio Ito

Ken Ikuma

Koji Akioka

Hideki Ishigami

Nobuyuki Hamakura

Shoji Takahashi

Hiroharu Akioka

Takeshi Ikuma

Tatsuya Shimod

Tatsuya Smimoda

Junichi Hayash

A gearing includes an internal gear, a flexible external gear partially meshing with the internal gear and relatively rotating about a rotation axis to the internal gear, and a wave generator including a bearing contacting an inner circumferential surface of the external gear and a cam contacting an inner circumferential surface of the bearing and moving a mesh position between the internal gear and the external gear in a circumferential direction about the rotation axis, wherein an outer circumferential surface of the bearing forms a circular shape without contact with the cam, the inner circumferential surface of the external gear forms a circular shape without contact with the wave generator, and where an outer diameter of the bearing without contact with the cam is d[mm] and an inner diameter of the external gear without contact with the wave generator is d[mm].

Gearing and robot

A robot includes a flexible gear formed by a ferrous material containing at least one or more kinds of elements of Group 4 elements and Group 5 elements in a range from 0.01 percent by mass to 0.5 percent by mass. The ferrous material contains at least one of nickel-chromium-molybdenum steel, maraging steel, and precipitation-hardened stainless steel.

Robot, flexible gear, gearing, and manufacturing method of flexible gear

A robot includes a first member, a second member provided to be capable of turning with respect to the first member, and a gear device configured to transmit a driving force from one side to the other side of the first member and the second member. The gear device includes internal teeth and external teeth provided halfway in a transmission path of the driving force and configured to mesh with each other and lubricant disposed between the internal teeth and the external teeth. An average grain size of a constituent material of the external teeth is smaller than an average grain size of a constituent material of the internal teeth.

Robot and gear device

A method of manufacturing a translucent ceramic is provided. The method comprises: mixing a raw powder and an organic binder and kneading them to obtain a compound, the raw powder containing an aluminum oxide powder and a magnesium oxide powder, and the organic binder containing a first organic component and a second organic component; molding the compound in a predetermined shape by an injection molding method to obtain a green body; debinding the organic binder contained in the green body to obtain a brown body; and sintering the brown body to obtain a sintered body of the translucent ceramic. When the softening point of the first organic component is defined as 'T' (&#xb0; C.) and the softening point of the second organic component is defined as 'T' (&#xb0; C.), the kneading step is carried out at a temperature in the range of Tor higher but lower than Tafter the raw powder and the organic binder are preheated at a temperature in the range of Tto T+100(&#xb0; C.). An orthodontic member is also provided.

Method of manufacturing translucent ceramic and orthodontic member

A method for producing a sintered body includes: a) molding a composition containing a powder primarily made of an inorganic material and a binder including an aliphatic carbonic acid ester based resin in a predetermined shape so as to obtain a compact; b) exposing the compact to a first atmosphere containing an alkaline gas and thus decomposing and removing the aliphatic carbonic acid ester based resin from the compact so as to obtain a degreased body; and c) sintering the degreased body so as to obtain a sintered body.

Sintered body and method for producing the same

A composition for forming a green body is provided. The composition for forming the green body contains powder constituted of a metallic material and a binder containing a first resin which is decomposable by ozone and a second resin which is also decomposable by ozone but decomposed later than the first resin. The green body formed of the composition is used in producing a brown body, wherein the brown body is produced by first exposing the green body to a high ozone content atmosphere to decompose the first resin and remove the decomposed first resin and then decompose the second resin and remove the decomposed second resin, and then at least once exposing the thus obtained green body to a low ozone content atmosphere whose ozone concentration is lower than an ozone concentration of the high ozone content atmosphere. By using the composition mentioned above, it is possible to produce the green body and the brown body from which a metal sintered body having a reduced metal oxide amount and improved properties (dimensional accuracy) can be produced safely, easily and cost-effectively. Such a brown body and a metal sintered body are also provided.

Composition for forming green body, brown body and sintered body

A method for producing a sintered body is provided. The method for producing the sintered body comprising: forming a green body by molding a composition for forming a green body into a specified shape to obtain the green body, the composition comprising powder constituted of a metallic material and a binder containing a first resin which is decomposable by ozone; first debinding the green body by exposing the green body to a high ozone content atmosphere to decompose the first resin and remove the decomposed first resin form the green body to obtain a brown body; exposing the thus obtained brown body at least once to a low ozone content atmosphere whose ozone concentration is lower than an ozone concentration of the high ozone content atmosphere to obtain an intermediate brown body; and sintering the intermediate brown body which has been exposed to the low ozone content atmosphere to obtain the sintered body. By using the composition mentioned above, it is possible to safely, easily and cost-effectively produce a metal sintered body having a reduced metal oxide amount and improved properties (dimensional accuracy). Such a sintered body is also provided.

Method for producing sintered body and sintered body

In a method for manufacturing a sintered body of the present invention, a feed stock including metal powder, a binder, and an organic material having a melting point lower than that of the binder is extrusion molding by using an extruder , so that an extruded body having a desired shape (cross-sectional shape) and dimensions is manufactured. In this method, a temperature of an extrusion side die of an extrusion die is lower than the melting point of the binder and higher than that of the organic material. Next, a debinding treatment (treatment for removing binder) of the obtained extruded body is performed. The debinding treatment is separately performed by a first process in a low temperature region and a second process in a temperature region higher than that in the first process. Subsequently, an obtained debounded body is sintered by baking in a sintering furnace, whereby the sintered body (metal product) is manufactured.

Method for producing sintered body

A method of the present invention manufactures a watch-bracelet component through step (1A) of producing a green body containing a raw material powder by extrusion molding, step (2A) of cutting the green body, step (3A) of debinding the cut green body, and step (4A) of sintering the debound body to yield a sintered body. Subsequently, the method can easily manufacture even a product having a complicated shape, and the invention can provide a method of manufacturing a watch-bracelet component with a wide range of materials to choose from.

Method of manufacturing watch-bracelet component

A highly reliable sintered compact which can be readily and safely produced, and a method for producing such sintered compact are provided. The sintered compact is preferably formed into a heat sink which comprises a heat sink main body The heat sink main body comprises a substrate a plurality of projections integrally formed with the substrate on its heat dissipation surface, and a molded frame integrally formed with the substrate to surround the projections On each corner of the substrate is formed a circular molded hole The opposite surface of the substrate is formed into a contacting surface which is adapted to be in contact with the heat generating semiconductor chip, and this contacting surface is surface treated, for example, by plating. The sintered compact is produced from metal powders, and it comprises at least one metal selected from tungsten and molybdenum and 2 to 50% by weight of silver. The sintered compact further comprises not more than 10% by weight of a transition metal.

Sintered compact and method of producing the same

Metal sintere body and production method thereof

A method of manufacturing screws which can form screws each having a desired hollow axial bore easily and having excellent machinability is provided. The method comprises the steps of (A) producing a green body containing metal powder by means of extrusion molding; (B) debinding the green body to obtain a brown body; and (C) sintering the brown body to obtain a sintered compact, wherein at least one machine working including a thread cutting process is carried out at anytime after the completion of the step (A). The step (C) of this method may include a pre-sintering step for obtaining a pre-sintered compact and a secondary sintering process, and the machining process including a thread cutting process is carried out onto the pre-sintered compact after the completion of the pre-sintering step.

Method of manufacturing screws

A method of manufacturing a sintered compact is disclosed herein. The method comprises the steps of: (1A) producing a green body containing metal powder, for example, by means of metal injection molding (MIM); (2A) compacting the green body by pressing it preferably by means of an isostatic pressing (2A); (3A) debinding the compacted green body; and (4A) sintering the debinded green body to obtain a sintered compact. The green body compacting step may be carried out during or after the debinding step or during the debinding step. Further, a step for performing machine working on the green body may be included.

Process for producing sintered product

An abutment tooth model which can improve a mold releasable property of the prosthetic restoration (releasability from an abutment tooth model or a mold) and a method of manufacturing such a prosthetic restoration are provided The abutment tooth model is formed of a base material such as an ultra-hard plaster (CaSO,.2H,O), and at least one oxide selected from the group comprising Zr, Y and Ca. The abutment tooth model is formed so as to be slightly larger than the abutment tooth to the extent of the degree of shrinkage of the prosthetic restoration (green body) by taking the curing expansion upon molding and the thermal expansion upon sintering into account The abutment tooth is formed using a compound in which Ti powder or Tn alloy powder is contained as its main component, and the compound is built up onto the abutment tooth model,so as to have a desired shape, and thus obtained green body is subjected to a debinding treatment. Then, the green body is sintered together with the green body to obtain a prosthetic restoration composed of the metal sintered body

Abutment tooth model and method of manufacturing a prosthetic restoration to be formed on the abutment tooth model

A prosthetic restoration of the invention is made from a metal material containing Ti as the main component and from 0.01 to 3 wt % of M (were M is at least one element selected from the group comprising Si, Zr, Ca, P and In). Further, in addition to these materials, from 0.01 to 4 wt % of Q (where Q is at least one element selected from the group comprising Al, Sn, V ad Cu) may be contained. On an outer surface of such a metal material, a coating layer formed of porcelain or synthetic resin or the like can be provided. Such a prosthetic restoration can be manufactured as follows. First, a model of an abutment tooth is manufactured. Next, a compound is prepared by mixing and kneading metallic powder of Ti or an alloy containing Ti, powder composed of the M or a compound containing the M and a binder. In this case, the powder composed of Q or an compound containing the Q may be added. Thereafter, thus obtained compound is built up onto the model of the abutment tooth to form a green body of the prosthetic restoration having a desired shape. Here, it is preferred that the built-up mass becomes slightly larger than the desired shape taking shrinkage of the built-up mass during sintering into consideration. Then, the built-up mass is subjected to a debinding treatment, which is then sintered to obtain a metallic sintered body. A coating layer may be formed onto the outer surface of the metallic sintered body.

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Matsumoto, Japan

Masaaki Sakata