IT202000003727A1 - MANUFACTURING PROCESS OF A BOLT OR SCREW WITH A PITCH DECURTED BY INCLINED OR CONICAL, CEDABLE ROLLERS - Google Patents
MANUFACTURING PROCESS OF A BOLT OR SCREW WITH A PITCH DECURTED BY INCLINED OR CONICAL, CEDABLE ROLLERS Download PDFInfo
- Publication number
- IT202000003727A1 IT202000003727A1 IT102020000003727A IT202000003727A IT202000003727A1 IT 202000003727 A1 IT202000003727 A1 IT 202000003727A1 IT 102020000003727 A IT102020000003727 A IT 102020000003727A IT 202000003727 A IT202000003727 A IT 202000003727A IT 202000003727 A1 IT202000003727 A1 IT 202000003727A1
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- IT
- Italy
- Prior art keywords
- bolt
- rollers
- conical
- screw
- pitch
- Prior art date
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 238000000034 method Methods 0.000 claims description 5
- 230000001360 synchronised effect Effects 0.000 claims description 3
- 230000000284 resting effect Effects 0.000 claims description 2
- 241000589902 Leptospira Species 0.000 description 5
- 210000001520 comb Anatomy 0.000 description 2
- 244000089486 Phragmites australis subsp australis Species 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004069 differentiation Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H3/00—Making helical bodies or bodies having parts of helical shape
- B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
- B21H3/04—Making by means of profiled-rolls or die rolls
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Forging (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Description
DESCRIZIONE DEL BREVETTO PER INVENZIONE DAL TITOLO: DESCRIPTION OF THE PATENT FOR INVENTION BY TITLE:
?PROCEDIMENTO DI FABBRICAZIONE DI UN BULLONE O VITE A PASSO DECURTATO DA RULLATORI INCLINATI O CONICI, CEDEVOLI? ? MANUFACTURING PROCESS OF A BOLT OR SCREW WITH A PITCH DECURTED BY INCLINED OR CONICAL, CEDABLE ROLLERS?
Campo della tecnica: nella bulloneria. Field of technology: in nuts and bolts.
I problemi tecnici incontrati sono i seguenti: The technical problems encountered are the following:
In un bullone tradizionale nel suo serraggio il carico si concentra per il 50% sul primo filetto in presa e per il 20% sul secondo filetto in presa; nel presente invece il carico si ripartisce in modo uguale su ogni filetto in presa. When tightening a traditional bolt, the load is concentrated 50% on the first thread in engagement and 20% on the second thread in engagement; in the present, on the other hand, the load is distributed equally on each thread in contact.
Soluzione al problema: si pratica nel bullone forato un filetto decurtato del cedimento sul primo filetto in presa inclinando i rullatori o con i rullatori conici. Solution to the problem: a thread is made in the hollow bolt with a reduction of the yield on the first thread in contact by tilting the rollers or with the conical rollers.
Veniamo ora ad illustrare che cosa ? noto: We now come to illustrate what? known:
? noto che in un normale bullone filettato ?ma?, il carico ? del 50% sul primo filetto in presa e del 20% sul secondo filetto in presa. ? I notice that in a normal threaded bolt? but ?, the load? 50% on the first thread in connection and 20% on the second thread in connection.
E' noto che la testa del bullone pu? essere eseguita o per deformazione plastica da tubo rullato nelle macchine Waterbury o National, o rullatrici, oppure per saldatura al gambo mediante frizione; nel quale ultimo caso la parte filettata del tubo pu? essere eseguita fino alla testa del bullone, mentre la filettatura viene rullata. It is known that the head of the bolt can? be performed either by plastic deformation from rolled tube in Waterbury or National machines, or by rolling machines, or by welding to the stem by means of friction; in which last case the threaded part of the tube can? be performed up to the head of the bolt, while the thread is rolled.
? noto che, la sollecitazione ? minore nel bullone semplicemente forato, poich? si ripartisce il carico su di una parte a maggiore allungamento. ? I notice that, the solicitation? minor in the bolt simply drilled, since? the load is distributed over a part with greater elongation.
E' noto che una differenza di passo si accumula con l'aumentare del numero dei filetti. It is known that a difference in pitch accumulates as the number of threads increases.
Da studi precedenti del depositante Levi d'Ancona, il dado allungato presentava una minor concentrazione delle linee di forza all'attacco della testa rispetto al tradizionale. From previous studies by the depositor Levi d'Ancona, the elongated nut had a lower concentration of the lines of force at the head attack than the traditional one.
LO SCOPO DEL TROVATO THE PURPOSE OF THE FOUND
? quello di fabbricare un bullone leggero e resistente a doppio sforzo. ? to fabricate a lightweight, double-stress resistant bolt.
I BREVETTI ESAMINATI SONO I SEGUENTI: PATENTS EXAMINED ARE THE FOLLOWING:
DE202006008313: E' un bullone che, essendo forato, liscio all'interno, si allunga pi? facilmente, distribuendo pertanto maggiormente il carico sui vari filetti; l?anima pertanto non ha perso totalmente il difetto di non rilasciare lo sforzo concentrato sul primo filetto in presa; quindi in detto brevetto non si presenta il nostro passo decurtato nella tornitura oppure inclinando il pettine o il rullo. DE202006008313: It is a bolt which, being drilled, smooth inside, extends more? easily, thus distributing more the load on the various threads; therefore the core has not totally lost the defect of not releasing the concentrated effort on the first thread in the grip; therefore in said patent our pitch is not reduced in turning or by tilting the comb or the roller.
ALLO STATO ATTUALE DELLA TECNICA, molti tentativi erano stati effettuati allo scopo di ripartire meglio il carico fra i vari filetti in presa: il Maduska aveva fatto variare il diametro esterno della madrevite (dado ad imbuto); il Levi d?Ancona lo perfezion? ulteriormente imbutendolo da lamiera. Sempre nel suo libro ?parti interne di macchine?, il Levi d?Ancona propose il bullone filettato da due pettini assottigliati ad angolo; il Bolt praticava una scanalatura a profondit? variabile sul fondo della gola della madrevite; altri la filettatura a diametro variabile o di passo variabile (soluzioni non praticamente interessanti). Altro dato da non sottovalutare, ? quello che sulla prima spira in presa la deformazione diviene permanente, quasi doppia del limite di elasticit?! IN THE CURRENT STATE OF THE ART, many attempts had been made in order to better distribute the load between the various threads in the grip: the Maduska had made the external diameter of the nut screw (funnel nut) vary; the Levi d? Ancona perfected it? further by drawing it from sheet metal. Still in his book? Internal parts of machines? Levi d? Ancona proposed the bolt threaded by two combs thinned at an angle; the Bolt practiced a deep groove? variable at the bottom of the nut throat; others the threading with variable diameter or variable pitch (not practically interesting solutions). Another data not to be underestimated,? the one that the deformation becomes permanent on the first coil, almost double the elasticity limit!
GLI STUDI DEI DEPOSITANTI SONO I SEGUENTI: THE STUDIES OF THE DEPOSITORS ARE THE FOLLOWING:
Da esperimenti effettuati dal Levi d?Ancona, ancora studente, nei suoi esperimenti di fotoelasticit?, risult? che il diagramma delle tensioni poteva essere meno gravoso nel dado tubolare. From experiments carried out by Levi d? Ancona, still a student, in his photoelasticity experiments, it resulted? that the stress diagram could be less burdensome in the tubular nut.
Ne consegue che occorre diminuire il carico in corrispondenza dei filetti in presa con altri metodi: negli anni 60 lo scrivente Levi d?Ancona ottenne dei risultati inclinando i pettini filettatori debitamente scaricati, mentre nel presente trovato i rulli filettatori sono normali, ma inclinati o conici. It follows that it is necessary to reduce the load in correspondence with the threads in contact with other methods: in the 1960s the writer Levi d? Ancona obtained results by tilting the duly unloaded threading reeds, while in the present invention the threading rolls are normal, but inclined or conical .
Veniamo ora ad effettuare l'ESPOSIZIONE DELL'INVENZIONE We now come to carry out the EXPOSURE OF THE INVENTION
Come al solito, eventualmente il bullone (1), poggiante sulla lama (4) di supporto, ? cavo in (2), al fine di renderlo pi? elastico; lo si tira, tav. 1, dall'ultimo filetto in presa (5) decurtandone maggiormente i filetti, fino al primo filetto in presa a mezzo dell'inclinazione dei rullatori (3), o della loro conicit?, in modo da decurtare progressivamente i filetti dalla estremit? fino al primo filetto in presa; in pratica, si tira sotto sforzi il bullone dall'ultimo filetto in presa del bullone. In pratica, il bullone presenta la massima sezione nell'estremit? (5), e poi a degradare, fino ad eguagliare le tensioni sui vari filetti quando il bullone ? serrato. I rulli (3), motorizzati in (5), sono scanalati internamente in (6) e cedono assialmente, o elasticamente contrastati dalle molle (7), oppure elicoidalmente in (10), in corrispondenza dell'aumento diametrale del bullone; naturalmente i due motori (5) sono sincronizzati o meccanicamente, o elettricamente (o con ingranaggi a contatto, cinghie incrociate o catene incrociate, oppure sincronizzati elettricamente a fili incrociati inversi). Con questa sinergia con la testa del bullone, si presenta cos? un assestamento delle linee di forza all'interno del bullone, tale da renderle meno dense e tale da rendere il bullone pi? resistente a fatica. As usual, possibly the bolt (1), resting on the support blade (4),? cable in (2), in order to make it more? rubber band; it is pulled, pl. 1, from the last thread in socket (5) by reducing the threads more, up to the first thread in socket by means of the inclination of the rollers (3), or their taper, so as to progressively reduce the threads from the extremity? up to the first fillet in place; in practice, the bolt is pulled under stress from the last thread of the bolt. In practice, the bolt has the maximum section in the extremity? (5), and then to degrade, until the tensions on the various threads are equal when the bolt? tight. The rollers (3), motorized in (5), are internally grooved in (6) and yield axially, or elastically opposed by the springs (7), or helically in (10), in correspondence with the diametrical increase of the bolt; naturally the two motors (5) are synchronized either mechanically, or electrically (or with contact gears, crossed belts or crossed chains, or electrically synchronized with inverse crossed wires). With this synergy with the bolt head, it looks like this? a settlement of the lines of force inside the bolt, such as to make them less dense and such as to make the bolt more? fatigue resistant.
VANTAGGI: BENEFITS:
1- si elimina dalla filettatura la parte conferente tensioni abnormi 1- the part giving rise to abnormal tensions is eliminated from the thread
ATTIVITA' INVENTIVA: INVENTIVE ACTIVITY:
a) L?insieme di tanti bulloni o viti con minor concentrazione delle linee di forza, alleggerisce tutta la struttura assiemata; a) The set of many bolts or screws with less concentration of the lines of force, lightens the whole assembled structure;
b) Una migliore ripartizione delle sollecitazioni interne permette di reggere ad un maggior carico di fatica. b) A better distribution of the internal stresses allows to withstand a greater fatigue load.
c) Se il bullone o la vite regge al doppio sforzo, la minor concentrazione delle linee di forza sul pezzo da serrare permette di dimezzare il peso del pezzo serrato. c) If the bolt or screw holds up to double effort, the lower concentration of the lines of force on the workpiece to be clamped allows to halve the weight of the clamped workpiece.
d) La differenziazione di passo non ? molto dispendiosa, se decurtata nella ultima filettatura, ottenuta inclinando i pettini filettatori o rulli. d) The pitch differentiation does not? very expensive, if reduced in the last thread, obtained by tilting the threading dies or rollers.
e) Una volta raggiunto il carico di serraggio, la conicit? di testa cede fino al pareggio sul pezzo (con chiave dinamometrica fino al contatto); la tensione residua render? il dado autobloccante; e) Once the clamping load is reached, the taper? head yields until it is even on the piece (with a torque wrench until contact); the residual voltage render? the self-locking nut;
f) Sotto testa del bullone non si presentano pi? addensamenti di linee di forza, che agli estremi limiti si presenterebbe il distacco; f) Under the head of the bolt no longer occur? thickening of lines of force, which at the extreme limits would occur the detachment;
g) La diminuzione della densit? delle linee di forza nel pezzo da serrare ne rende integro il materiale anche sotto sollecitazione a fatica, e ci? ? di basilare importanza per la tenuta dei serbatoi. g) The decrease in density? of the force lines in the piece to be clamped makes the material intact even under fatigue stress, and what? ? of fundamental importance for the tightness of the tanks.
h) Nelle caldaie e nei motori a scoppio il calore viene evacuato dall'anima interna del bullone (vuota). h) In internal combustion boilers and engines the heat is evacuated from the inner core of the bolt (empty).
UNITA' DELL'INVENZIONE: UNIT OF THE INVENTION:
Il bullone o la vite sono eseguiti in un solo pezzo a mezzo di rullatori inclinati o conici. The bolt or screw are made in one piece by means of inclined or conical rollers.
INDUSTRIALIZZAZIONE DEL TROVATO: INDUSTRIALIZATION OF THE FOUND:
Il bullone o la vite vengono eseguiti dal pieno o dal tubo, come nel procedimento tradizionale. Si ? solo diminuito il suo diametro esterno in corrispondenza della giunzione fra i due pezzi, a mezzo dei pettini o rulli inclinati o conici. The bolt or screw is made from solid or from the tube, as in the traditional procedure. Yup ? only by decreasing its external diameter at the junction between the two pieces, by means of the inclined or conical combs or rollers.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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IT102020000003727A IT202000003727A1 (en) | 2020-02-24 | 2020-02-24 | MANUFACTURING PROCESS OF A BOLT OR SCREW WITH A PITCH DECURTED BY INCLINED OR CONICAL, CEDABLE ROLLERS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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IT102020000003727A IT202000003727A1 (en) | 2020-02-24 | 2020-02-24 | MANUFACTURING PROCESS OF A BOLT OR SCREW WITH A PITCH DECURTED BY INCLINED OR CONICAL, CEDABLE ROLLERS |
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IT202000003727A1 true IT202000003727A1 (en) | 2021-08-24 |
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IT102020000003727A IT202000003727A1 (en) | 2020-02-24 | 2020-02-24 | MANUFACTURING PROCESS OF A BOLT OR SCREW WITH A PITCH DECURTED BY INCLINED OR CONICAL, CEDABLE ROLLERS |
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Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB892211A (en) * | 1957-05-25 | 1962-03-21 | Herbert Ltd A | Improvements in thread-rolling heads |
US3159856A (en) * | 1961-12-30 | 1964-12-08 | Altenloh Brinck & Co Fa | Apparatus for simultaneously thread rolling the shank and cutting threads on the point of a screw blank |
CN1217957A (en) * | 1997-11-20 | 1999-06-02 | 储士强 | Roller for screw thread steel |
JP2006239768A (en) * | 2005-03-07 | 2006-09-14 | Rex Industries Co Ltd | Thread rolling roller |
DE202006008313U1 (en) | 2006-05-26 | 2007-09-27 | Abc Umformtechnik Gmbh & Co. Kg | Fastening arrangement for motor vehicle wheels |
EP2391467A1 (en) * | 2009-01-29 | 2011-12-07 | Lisi Aerospace | Screw or nut with a thread a pitch of which varies and tool to produce said screw or nut |
KR101771048B1 (en) * | 2017-03-30 | 2017-08-24 | 김종희 | Thread rolling machine and thread rolling method |
EP3248706A1 (en) * | 2016-05-24 | 2017-11-29 | Mico S.r.l. | Rolling machine for forming impressions on cylindrical bodies and method for substituting a forming roller of such rolling machine |
-
2020
- 2020-02-24 IT IT102020000003727A patent/IT202000003727A1/en unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB892211A (en) * | 1957-05-25 | 1962-03-21 | Herbert Ltd A | Improvements in thread-rolling heads |
US3159856A (en) * | 1961-12-30 | 1964-12-08 | Altenloh Brinck & Co Fa | Apparatus for simultaneously thread rolling the shank and cutting threads on the point of a screw blank |
CN1217957A (en) * | 1997-11-20 | 1999-06-02 | 储士强 | Roller for screw thread steel |
JP2006239768A (en) * | 2005-03-07 | 2006-09-14 | Rex Industries Co Ltd | Thread rolling roller |
DE202006008313U1 (en) | 2006-05-26 | 2007-09-27 | Abc Umformtechnik Gmbh & Co. Kg | Fastening arrangement for motor vehicle wheels |
EP2391467A1 (en) * | 2009-01-29 | 2011-12-07 | Lisi Aerospace | Screw or nut with a thread a pitch of which varies and tool to produce said screw or nut |
EP3248706A1 (en) * | 2016-05-24 | 2017-11-29 | Mico S.r.l. | Rolling machine for forming impressions on cylindrical bodies and method for substituting a forming roller of such rolling machine |
KR101771048B1 (en) * | 2017-03-30 | 2017-08-24 | 김종희 | Thread rolling machine and thread rolling method |
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