DUBBEL TASCHENBUCH FUR DEN MASCHINENBAU PDF
DUBBEL—Taschenbuch für den Maschinenbau. Book Reviews gel6st, eine komplette, systematisch aufgebaute Zusammenstellung der nahezu 10, Dubbel: Taschenbuch für den Maschinenbau. DRM-free; Included format: PDF; ebooks can be used on all reading devices; Immediate eBook download after. ISBN ; Digitally watermarked, DRM-free; Included format: PDF; ebooks can be used on all reading devices; Immediate eBook download after.
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[EPUB] Dubbel: Taschenbuch für den Maschinenbau by J. Feldhusen, H. Grote. Book file PDF easily for everyone and every device. You can download and. „Der DUBBEL ist seit Generationen das Standardwerk der Ingenieure mit den Schwerpunkten "Allgemeiner Maschinenbau" und "Verfahrens- und. قصص منوعة download Dubbel: Taschenbuch für Sports since second be a own state of sources and contents(PDF, DOCX, DICOM, SVG and.
Dem Konstrukteur wird das Auffinden der zu seiner Bewegungsaufgabe geh6renden L6sung durch eine sinnvoll aufgebaute Ordnungsnummer auf denkbar einfache Weise erm6glicht; Vorkenntnisse sind nicht erforderlich. Die einffihrenden Beispiele zeigen die vielseitigen Nutzungsm6glichkeiten des Kataloges--wie z.
Als solche sind alle Getriebebauformen im Katalog dargestellt, und zwar als Computergrafiken. Der Autor stfitzte sich auf langjfihrige Forschungsarbeiten zur Systematik der kinematischen Ketten und ihre rechnergestiitzte Erfassung. Der Katalog schliel3t eine wesentliche Liicke, die in der Praxis der Getriebekonstruktion bestand. Er gibt nunmehr jedem Konstrukteur, der wirtschaftliche, einfachste Getriebekonstruktionen anstrebt, die Sicherheit, die theoretisch m6glichen Getriebestrukturen vollstandig zu erfassen.
Der Katalog ist von unbegrenzter Gfiltigkeitsdauer und sollte als Rationalisierungsmittel in keinem Konstruktionsbiiro fehlen.
Seiten, Bilder u n d Tabellen. Springer lag, Berlin, In seiner Sein bisheriger Umfang wurde um solche aktuelle Kapitel wie "Grundlagen der Konstruktionstechnik", "Akustik", "Thermischer Apparatebau" und "Mel3technik" als Grundlage der Automatisierung erweitert. The point was that the temperature at which the powder was sintered caused viscous flow only at contiguous boundaries of particles with at least some portion of each particle remaining solid.
The skilled person reading the description A2-document column 5, lines 19 to 23 would clearly understand that meaning of the claimed teaching, and no interpretation of the meaning of "bonding temperature" in view of the technical dictionaries was necessary since the original disclosure was clear and unambiguous.
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The documents filed after the expiry of the opposition period should not be admitted since there was no reason why they could not be presented by the Appellant in due time. The method now claimed according to claim 1 was novel and non-obvious when compared with the cited prior art documents.
Particularly D2 disclosed generally the mold forming of a part, but no sintering of a high temperature material coated with a low temperature material. According to D3 only composite material was used, and no annealing was disclosed there. Therefore the skilled person would not combine the teachings of D2 with D3.
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Also D18 did not mention a coated powder, and no indication was given to use a high temperature material coated with a low temperature material. Particularly the shrinkage problem was solved by the combination of features and steps used in the method of the patent in suit including annealing, and obviousness of the claimed solution could only be presumed by ex-post-facto analysis.
Reasons for the Decision 1. The appeal is admissible.
Admissibility of late filed documents 2. In the present case the step of heat treatment of a sintered part is explicitly disclosed in document D18 as being prior art while according to D3 reference is only made to post formation treatment in general.
That additional feature is of relevance for the consideration of inventive step.
The Appellant who had lost the opposition proceedings should be given the opportunity to fill the gap in its arguments by presenting further evidence in the second instance. Therefore the Board admitted D18 into the proceedings.
In contrast to the above circumstances the Board does not see that the documents filed with letter of 28 March would be of higher relevance than the prior art documents already introduced into the proceedings. Amendments and disclosure 3. Considering the Appellant's objections with regard to the term "softening temperature" the following considerations apply.
The skilled person in the present case is considered to be a materials processing engineer experienced in the field of sintering.
DUBBEL—Taschenbuch für den Maschinenbau
This person has general knowledge of sintering processes which are typically carried out at a temperature below the melting temperature of the material to be sintered. Reading the patent application documents see page 4, line 35 to page 5, line 1; page 7, lines 31 to 35; page 17, lines 30 to 34; page 39, claim 40; or A2-document: column 3, lines 17 to 20; column 5, lines 23 to 27; column 12, lines 46 to 51; column 27, claim 40 this skilled person is aware of the fact that sintering of the particles is caused by their melting and bonding at contiguous boundaries while some portion of the particle remains solid.
Claim 1 therefore merely explains how selective sintering is achieved in the present case and that the characterising feature of the second material defined by its "softening temperature" is not to be understood as the definition of the "softening temperature" as a specific material property but rather indicates that the sintering is limited to the material of the boundaries of the particles.
Since the disclosure of the patent is consistent and fully within what the skilled person expects when dealing with a selective sintering process he would not consider another, different technical meaning of the term "softening temperature" such as suggested by the Appellant. With respect to the further objection raised by the Appellant according to which the property of lower softening temperature of the second material was not disclosed in the original claim 40 on which the valid claim 1 is based, the skilled person understands immediately the relation of the core material and the coating material when reading the description of the application as filed see page 18, line 7 to page 19, line 28; or A2-document: column 13, line 3 to column 14, line 9.
The examples given there indicate clearly the method of selective sintering when applying the coated powder comprising the high temperature first material and the low temperature second material.
Having regard to claim 4 which is dependent on claim 1 it is clear that bonding of each deposited layer by irradiation is carried out on the target surface of these layers. Therefore, when the temperature of the powder mass is increased by conventional heating means see A2-document column 9, line 55 to column 10, line 2 this target surface is self-evidently also increased thus allowing the use of an energy beam merely supplying a small increase of energy.
In view of the above conclusions the Board is satisfied that the amended patent does not give rise to objections under Article 2 and 84 EPC.
Table of contents
Novelty Novelty of the subject-matter of claim 1 was not contested by the Opponent. The Board is satisfied that none of the cited prior art documents discloses a method with all the steps and features of claim 1.
Inventive step 5. The closest state of the art is represented by D18 which document discloses a method of producing a part including the steps of the pre-characterising portion of claim 1 using a mixture of metal powder and plastic binder wherein, after removing unbonded portions of the powder, the yielded mass is heated page , point 7; page , point 4.
Starting from such a known method the objective problem to be solved by the invention is to produce a final part of better homogeneity and quality.
This technical problem is solved by a system comprising the steps and features of claim 1. Particularly by using a powder comprising particles of a first material having a high softening temperature coated with a second material having a lower softening temperature than the first material it can be ensured that the selective sintering takes place at the boundaries of virtually each particle.
Furthermore, shrinking of the part after sintering can be avoided by the selection of a thin coating, and via the following step of annealing, the coating dissociates and the part can be formed to its final shape see patent in suit column 9, lines 6 to D18 discloses exclusively the use of powder or a mixture of powder in the method of forming a part by sintering.
Since any indication is lacking for the use of a powder comprising particles of a first material coated with a second material having a lower softening temperature than the first material these features are non-obvious when compared with the teachings of document D18 alone.
The Appellant was of the opinion that the skilled person would arrive in an obvious manner at the method of claim 1 when combining the teachings of D18 with those of D2. D2 discloses a molding process for forming a three-dimensional article wherein planar layers of material are sequentially deposited and a portion of each layer is selectively solidified by using heat see abstract.
According to a single distinct embodiment the fusible particles fused by a laser beam may be of a suitable plastic or plastic-coated sand see column 7, lines 44 to However, this embodiment based on sand particles does not suggest any heat treatment after forming the part.Komponenten des thermischen Apparatebaus.
Pages B1-B Er wird laufend neubearbeitet und somit stets auf dem aktuellen Stand der Technik gehalten.
He compares players' performances over different eras, and ventures a Majors all-time 'Hall of Fame' based on similar results. Berger, A.