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 PDF

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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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Italy
Prior art keywords
bolt
rollers
conical
screw
pitch
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IT102020000003727A
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Italian (it)
Inventor
D'ancona Pier Lorenzo Levi
Raoul Cangemi
Gianni Cerzoso
Original Assignee
Levi Dancona Pier Lorenzo
Raoul Cangemi
Gianni Cerzoso
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by Levi Dancona Pier Lorenzo, Raoul Cangemi, Gianni Cerzoso filed Critical Levi Dancona Pier Lorenzo
Priority to IT102020000003727A priority Critical patent/IT202000003727A1/en
Publication of IT202000003727A1 publication Critical patent/IT202000003727A1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21HMAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00Making helical bodies or bodies having parts of helical shape
    • B21H3/02Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • B21H3/04Making by means of profiled-rolls or die rolls

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  • 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)

RIVENDICAZIONI 1-Procedimento di fabbricazione di un bullone o vite decurtato dai rullatori inclinati o conici, cedevoli assialmente, caratterizzato da ci? che il bullone o vite (1), eventualmente cavo in (2) e poggiante sulla lama (4) di supporto, ? rullato dai rulli (3) inclinati o conici, e scanalati internamente in (6) e contrastati: o dalle molle (7), o dai cilindro elicoidali (10) in corrispondenza dell'aumento del diametro del bullone conico. 2- Procedimento come rivendicato in 1-, caratterizzato da ci? che i rulli (3), motorizzati in (5), sono scanalati internamente in (6) e sono contrastati dalla risposta assiale delle molle (7), onde compensare l'aumento di diametro del bullone conico. 3- Procedimento come rivendicato in 1-, caratterizzato da ci? che i rulli (3), motorizzati in (5), sono scanalati internamente in (6) e sono retratti assialmente dal rullo elicoidale (10), la cui inclinazione dei filetti del rullo (10) ? tale da compensare l'aumento di diametro del bullone (1) conico di circa 2 gradi rispetto all'asse. 4- Procedimento come rivendicato in 1- e 2-, caratterizzato da ci? che i due motori (5) sono sincronizzati inversamente fra di loro o meccanicamente, o elettricamente (o con i due ingranaggi in presa, o con cinghie dentate o catene incrociate, oppure con sincronizzazione elettronica inversa). CLAIMS 1-Manufacturing process of a bolt or screw reduced by inclined or conical rollers, axially yielding, characterized by ci? that the bolt or screw (1), possibly hollow in (2) and resting on the support blade (4),? rolled by the inclined or conical rollers (3), and grooved internally in (6) and contrasted: either by the springs (7), or by the helical cylinders (10) in correspondence with the increase in the diameter of the conical bolt. 2- Process as claimed in 1-, characterized by ci? that the rollers (3), motorized in (5), are internally grooved in (6) and are opposed by the axial response of the springs (7), in order to compensate for the increase in diameter of the conical bolt. 3- Process as claimed in 1-, characterized by ci? that the rollers (3), motorized in (5), are internally grooved in (6) and are axially retracted by the helical roller (10), whose inclination of the threads of the roller (10)? such as to compensate for the increase in diameter of the tapered bolt (1) of about 2 degrees with respect to the axis. 4- Process as claimed in 1- and 2-, characterized by ci? that the two motors (5) are synchronized inversely with each other or mechanically, or electrically (or with the two gears engaged, or with toothed belts or crossed chains, or with reverse electronic synchronization).
IT102020000003727A 2020-02-24 2020-02-24 MANUFACTURING PROCESS OF A BOLT OR SCREW WITH A PITCH DECURTED BY INCLINED OR CONICAL, CEDABLE ROLLERS IT202000003727A1 (en)

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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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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)

* Cited by examiner, † Cited by third party
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

Patent Citations (8)

* Cited by examiner, † Cited by third party
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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