ES2400760A2 - Abarcon monope and manufacturing procedure of the same (Machine-translation by Google Translate, not legally binding) - Google Patents

Abarcon monope and manufacturing procedure of the same (Machine-translation by Google Translate, not legally binding) Download PDF

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Publication number
ES2400760A2
ES2400760A2 ES201001512A ES201001512A ES2400760A2 ES 2400760 A2 ES2400760 A2 ES 2400760A2 ES 201001512 A ES201001512 A ES 201001512A ES 201001512 A ES201001512 A ES 201001512A ES 2400760 A2 ES2400760 A2 ES 2400760A2
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Spain
Prior art keywords
central part
piece
abarcon
monopieza
manufacturing
Prior art date
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Granted
Application number
ES201001512A
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Spanish (es)
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ES2400760B1 (en
ES2400760R1 (en
Inventor
Jesus Manuel GARCIA ARAUJO
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Transformados Metalicos Gades S L U
TRANSFORMADOS METALICOS GADES SLU
Original Assignee
Transformados Metalicos Gades S L U
TRANSFORMADOS METALICOS GADES SLU
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Priority to ES201001512A priority Critical patent/ES2400760B1/en
Publication of ES2400760A2 publication Critical patent/ES2400760A2/en
Publication of ES2400760R1 publication Critical patent/ES2400760R1/en
Application granted granted Critical
Publication of ES2400760B1 publication Critical patent/ES2400760B1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00Bending rods, profiles, or tubes

Abstract

One-piece cover and manufacturing process thereof, configured in u to fix tubes (7), consisting of a monoblock and solid body, carbon steel or stainless steel, whose central part (4) below is flat (5) and it has a top surface (6) of variable configuration, which is made from a piece (2) in the form of a cylindrical or "round" bar, the ends of which are subjected to a machining process for making threaded pins (3) to manufacture it. And then subjected to hot rolling or hot stamping process to modify the profile of its central part (4) providing the flat surface (5) by its lower part and the upper form (6) according to the needs of each application. Finally, the piece (2) is curved to give it the u shape by cold forming, with hydraulic press and matrix. (Machine-translation by Google Translate, not legally binding)

Description

ABARCÓN MONOPIEZA Y PROCEDIMIENTO DE FABRICACIÓN DEL MISMO ABARCÓN MONOPIEZA AND MANUFACTURING PROCEDURE OF SAME

OBJETO DE LA INVENCIÓN OBJECT OF THE INVENTION

La invención, tal como expresa el enunciado de la presente memoria descriptiva, se refiere a un abarcón monopieza y al procedimiento de fabricación del mismo, aportando a la función a que se destina varias ventajas, además de características de novedad inherentes a su organización y constitución, que se describirán en detalle más adelante y que suponen una destacable mejora del estado actual de la técnica. The invention, as expressed in the statement of the present specification, refers to a single piece scope and the manufacturing process thereof, contributing to the function to which several advantages are destined, in addition to novelty characteristics inherent to its organization and constitution. , which will be described in detail below and that represent a remarkable improvement of the current state of the art.

En particular, el objeto de la invención se centra en un abarcón que, configurado convencionalmente como dispositivo de sujeción en U, para fijar tubos, mástiles, barras y elementos similares, y siendo de los que dispone de extremos roscados y cuenta con una parte central de superficie interiormente plana, presenta la particularidad de estar constituido por una única pieza monobloque a la que se ha dado forma mediante un proceso de mecanizado, de laminado y forjado, evitando ventajosamente la existencia y realización de soldaduras que incrementan su coste de fabricación y merman su resistencia. In particular, the object of the invention is focused on an embankment that, conventionally configured as a U-clamping device, for fixing tubes, masts, bars and similar elements, and being one of which has threaded ends and has a central part with an internally flat surface, it has the peculiarity of being constituted by a single monobloc piece that has been shaped by a process of machining, rolling and forging, advantageously avoiding the existence and realization of welding that increase its manufacturing cost and reduce its resistance

ANTECEDENTES DE LA INVENCIÓN BACKGROUND OF THE INVENTION

Como es sabido, los abarcones son unos dispositivos de sujeción en U ampliamente utilizados en múltiples aplicaciones, sirviendo, generalmente, para sujetar tubos, mástiles, barras y elementos similares, normalmente cilíndricos. As is known, the rods are U-clamping devices widely used in multiple applications, generally serving to hold tubes, masts, bars and similar, normally cylindrical elements.

Dichos abarcones, que en su versión más simplificada consisten en una varilla metálica cilíndrica y curvada en U cuyos extremos están roscados, a menudo, por las características de la Said embracing, which in its most simplified version consists of a cylindrical and U-curved metal rod whose ends are often threaded by the characteristics of the

aplicación application
a que se destinan y/o para mejorar su to that be destined I to improve its

fijación fixation
al tubo, han de tener la parte inferior to the tube, have from to have the part lower

central plana. flat central.

Para conseguir dicha parte inferior central plana, en los abarcones convencionales conocidos hasta ahora en el mercado, se recurre a la incorporación al mismo de una pletina metálica que se suelda a la varilla, lo cual conlleva una serie de inconvenientes a los que la presente invención pretende dar solución. In order to achieve said flat central lower part, in the conventional embracing known until now in the market, the use of a metal plate that is welded to the rod is used, which entails a series of drawbacks to which the present invention It aims to give solution.

Tales inconvenientes consisten, por un lado, en el encarecimiento que supone la realización de dicha soldadura para fijar la pletina en la varilla del abarcón, y que debe sumarse al proceso de rebaje de los extremos de la varilla para realizar el fileteado de la zona roscada. Such disadvantages consist, on the one hand, in the cost of carrying out said welding to fix the plate on the rod of the embankment, and which must be added to the process of recessing the ends of the rod to make the threaded area threaded .

El segundo inconveniente, y tal vez más importante, es el hecho de que la soldadura realizada para la incorporación de la pletina se suele llevar a cabo a una temperatura muy elevada, lo cual conlleva la tendencia del material a cristalizar, provocando que merme la resistencia de la pieza. The second drawback, and perhaps more important, is the fact that the welding made for the incorporation of the plate is usually carried out at a very high temperature, which leads to the tendency of the material to crystallize, causing it to reduce the resistance Of the piece.


El objetivo de la presente invención es, pues, desarrollar un nuevo tipo de abarcón con superficie plana central que evite tales inconvenientes y permita garantizar una resistencia absoluta del material, debiendo señalarse que, por parte del solicitante se desconoce la existencia de ningún otro abarcón o invención de aplicación similar que presente

The objective of the present invention is, therefore, to develop a new type of embankment with a central flat surface that avoids such inconveniences and allows to guarantee an absolute resistance of the material, it should be noted that, on the part of the applicant, the existence of no other embracing is unknown or invention of similar application present

unas características técnicas, estructurales y constitutivas semejantes a las que presenta el que aquí se preconiza. technical, structural and constitutive characteristics similar to those presented here.

EXPLICACIÓN DE LA INVENCIÓN EXPLANATION OF THE INVENTION

Así, el abarcón monopieza y el procedimiento de fabricación del mismo que la presente invención propone, se configura como una destacable novedad Thus, the single piece scope and the manufacturing process thereof that the present invention proposes, is configured as a remarkable novelty

dentro inside
de su campo de aplicación, ya que a tenor de su from its countryside from application, already that to tenor from its

implementación implementation
y de forma taxativa, se alcanzan Y from shape taxative, be reach

satisfactoriamente satisfactorily
los objetivos anteriormente the objectives previously

señalados pointed out
como idóneos, estando los detalles how suitable, being the details

caracterizadores que lo hacen posible y que lo distinguen de lo ya conocido en el mercado, convenientemente recogidos en las reivindicaciones finales que acompañan a la presente memoria descriptiva. characterizers that make it possible and that distinguish it from what is already known in the market, conveniently included in the final claims that accompany this specification.

De forma concreta, pues, lo que la invención propugna es un abarcón que está configurado convencionalmente como dispositivo metálico de sujeción en U aplicable para fijar tubos o elementos cilíndricos similares, disponiendo de extremos roscados y una parte central de superficie inferior plana, presenta la particularidad de estar constituido por una única pieza metálica monobloque la cual se realiza a partir del siguiente procedimiento: Specifically, then, what the invention advocates is an embankment that is conventionally configured as a metal U-clamping device applicable to fix similar cylindrical tubes or elements, having threaded ends and a central part of flat bottom surface, has the particularity if it consists of a single monobloc metal part which is made from the following procedure:

En primer 1ugar, se parte de una barra metálica o quot;redondoquot;, que puede ser de acero al carbono First of all, it starts from a metal bar or "round", which can be made of carbon steel


(F-1 o similar) o de acero inoxidable (AISI 316 ó 304), de longitud variable según las necesidades y cuyo diámetro varía entre 15 a 100 mm. en función del ancho que requiera la pletina de cada caso.

(F-1 or similar) or stainless steel (AISI 316 or 304), of variable length according to the needs and whose diameter varies between 15 to 100 mm. depending on the width required by the case plate.

--
A los extremos de dicha barra se lo somete a un proceso de mecanizado para realizar sendas espigas roscadas, cuya longitud y diámetro variarán según las necesidades de cada caso. At the ends of said bar it is subjected to a machining process to make two threaded pins, whose length and diameter will vary according to the needs of each case.

Seguidamente, se procede a modificar el perfil central de la pieza para proporcionar la superficie plana inferior de la parte central, así como la forma superior que se desee otorgar a dicha zona, la cual, puede variar para distintas aplicaciones. Dicha modificación se realiza mediante un proceso de laminado Next, the central profile of the piece is modified to provide the lower flat surface of the central part, as well as the upper shape that is desired to be given to said area, which may vary for different applications. Said modification is made through a rolling process

o estampado en caliente. or hot stamping.

--
Finalmente, se curva la pieza para darle la forma en U mediante conformado en frío, con prensa hidráulica y matriz. El abarcón así terminado tendrá las medidas necesarias según el tubo a fijar. Finally, the piece is curved to give the U-shape by cold forming, with hydraulic press and die. The stump thus completed will have the necessary measures according to the tube to be fixed.

Visto lo que antecede, se constata que el descrito abarcón monopieza y el procedimiento de fabricación del mismo representan una innovación de características estructurales y constitutivas desconocidas hasta ahora, razones que unidas a su Given the above, it is found that the described one-piece scope and its manufacturing process represent an innovation of structural and constitutive characteristics unknown until now, reasons that together with its

utilidad utility
práctica, la dotan de fundamento suficiente practice, the dotan from basis enough

para for
obtener el privilegio de exclusividad que se obtain he privilege from exclusiveness that be

solicita. request.
DESCRIPCIÓN DE LOS DIBUJOS DESCRIPTION OF THE DRAWINGS


Para complementar la descripción que se está realizando del abarcón objeto de la invención y para ayudar a una mejor comprensión de las características que lo distinguen, se acompaña la presente memoria descriptiva, como parte integrante de la misma, de un juego de planos, en los que con carácter ilustrativo y

To complement the description that is being made of the scope object of the invention and to help a better understanding of the characteristics that distinguish it, the present descriptive report is attached, as an integral part thereof, of a set of drawings, in the that by way of illustration and

no no
limitativo se han representado las diferentes fases limitative be have represented the different phases

del of the
proceso de fabricación de dicho abarcón, process from manufacturing from saying span,

consistentes en consisting of
lo siguiente: the next:

Las figuras número 1 y 2.-Muestran, respectivamente una vista en planta y perfil de la pieza metálica de la que se parte para fabricar el abarcón monopieza objeto de la invención. Figures 1 and 2 show, respectively, a plan and profile view of the metal part from which it is used to make the single piece hem of the invention.

Las figuras número 3 y 4.-Muestran, respectivamente, una vista en planta y perfil de la pieza con las espigas de los extremos mecanizadas y roscadas. Figures 3 and 4 show, respectively, a plan view and profile of the piece with the pins of the machined and threaded ends.

Las figuras número 5 y 6.-Muestran, respectivamente, una vista en planta y perfil de la pieza en su siguiente fase de fabricación con la zona central ya modificada. Figures 5 and 6 show, respectively, a plan view and profile of the piece in its next phase of manufacturing with the central area already modified.

Las figuras número 7 a 9.-Muestran sendas vistas en sección de diferentes opciones de diseño alternativo del perfil de la parte central de la pieza. Figures number 7 to 9.- They show each section view of different alternative design options of the profile of the central part of the piece.

La figura número 10.-Muestra una vista en alzado del abarcón ya terminado y dispuesto en modo de uso sujetando el tubo a que se destina. Figure number 10.- Shows an elevation view of the embankment already finished and arranged in use mode holding the tube to which it is intended.

REALIZACIÓN PREFERENTE DE LA INVENCIÓN PREFERRED EMBODIMENT OF THE INVENTION


A la vista de las mencionadas figuras, y de acuerdo con la numeración adoptada, se puede apreciar en ellas un ejemplo de realización preferida de la invención, la cual comprende las partes y elementos que se describen en detalle a continuación.

In view of the aforementioned figures, and according to the numbering adopted, an example of a preferred embodiment of the invention can be seen therein, which comprises the parts and elements described in detail below.

Así, tal como se observa en dichas figuras, el abarcón (1) está constituido por un cuerpo monobloque y macizo, de configuración en U, disponiendo de extremos roscados y una parte central de superficie plana interiormente, para cuya fabricación se han seguido los siguientes pasos: Thus, as observed in said figures, the embankment (1) is constituted by a monobloc and solid body, U-shaped, having threaded ends and a central part of flat surface inside, for whose manufacture the following have been followed Steps:

--
Se parte de una pieza (2) metálica en forma de barra cilíndrica o quot;redondoquot;, que será de acero al carbono (F-1 o similar) o acero inoxidable (AISI 316 ó 304) y longitud variable con un diámetro de entre 15 a 100 mm (figuras 1 y 2). It is based on a metal part (2) in the form of a cylindrical rod or "round", which will be made of carbon steel (F-1 or similar) or stainless steel (AISI 316 or 304) and variable length with a diameter between 15 to 100 mm (figures 1 and 2).

--
Los extremos de dicha pieza (2) se someten a un proceso de mecanizado para realizar sendas espigas roscadas (3), cuya longitud y diámetro variarán según las necesidades de cada caso, siendo el fileteado de la rosca en entre M/6 a M/30 (figuras 3 y 4). The ends of said piece (2) are subjected to a machining process to make two threaded pins (3), whose length and diameter will vary according to the needs of each case, the thread filleting being between M / 6 to M / 30 (figures 3 and 4).

Posteriormente se somete a la pieza (2) a un proceso de laminado o estampado en caliente para modificar el perfil de su parte central (4) proporcionándole una superficie plana (5) por su parte inferior y una superficie superior (6) de configuración que, según las necesidades de cada aplicación, puede variar, pudiendo ser, por ejemplo, redondeada en su centro con aristas marcadas (figuras 5 y 6), angulada a dos vertientes (figura 7), angulada a dos vertientes que abarcan sólo su parte central (figura 8) o formando una elevación redondeada en la parte central (figura 9) . El ancho alto de dicho perfil de la parte central Subsequently, the piece (2) is subjected to a hot rolling or stamping process to modify the profile of its central part (4) by providing a flat surface (5) for its lower part and an upper surface (6) for configuration. , depending on the needs of each application, it can vary, being, for example, rounded in its center with marked edges (figures 5 and 6), angled to two slopes (figure 7), angled to two slopes that cover only its central part (figure 8) or forming a rounded elevation in the central part (figure 9). The high width of said profile of the central part


(4) de la pieza (2) será variable, determinado por el diámetro de la barra de partida y oscilando entre 15 a 100 mm de ancho y entre 6 a 30 mm de alto.

(4) of the piece (2) will be variable, determined by the diameter of the starting bar and ranging between 15 to 100 mm wide and between 6 to 30 mm high.

Finalmente, se curva la pieza (2) para Finally, the piece (2) is curved to

otorgarle la forma en U mediante conformado en frío, con prensa hidráulica y matriz, quedando el abarcón (1) terminado, tal como muestra la figura 1O, las medidas del cual irán en función del tubo (7) a que se destine, grant the U-shape by cold forming, with hydraulic press and die, leaving the end (1) finished, as shown in figure 1O, the measures of which will be a function of the tube (7) to which it is intended,

5 siendo preferentemente desde DN 15 mm hasta DN 500 mm. 5 being preferably from DN 15 mm to DN 500 mm.

Descrita suficientemente la naturaleza de la Describe sufficiently the nature of the

presente invención, así como la manera de ponerla en present invention, as well as how to put it in

práctica, no se considera necesario hacer más extensa practice, it is not considered necessary to make more extensive

10 su explicación para que cualquier experto en la materia comprenda su alcance y las ventajas que de ella se derivan, haciéndose constar que, dentro de su esencialidad, podrá ser llevada a la práctica en otras formas de realización que difieran en detalle de la 10 its explanation so that any expert in the field understands its scope and the advantages that derive from it, stating that, within its essentiality, it can be put into practice in other embodiments that differ in detail from the


15 indicada a título de ejemplo, y a las cuales alcanzará igualmente la protección que se recaba siempre que no se altere, cambie o modifique su principio fundamental.

15 indicated by way of example, and which will also achieve the protection that is sought as long as it does not alter, change or modify its fundamental principle.

Claims (8)

REIVINDICACIONES 1.-ABARCÓN MONOPIEZA, del tipo configurado como dispositivo de sujeción en U aplicable para fijar tubos (7) O elementos cilíndricos similares, siendo de los que dispone de extremos roscados y cuenta con una parte central de superficie internamente plana, caracterizado porque dicho abarcón (1) está constituido por un cuerpo monobloque y macizo de acero al carbono 1.-MONOPIEZA ABARCÓN, of the type configured as a U-clamping device applicable to fix tubes (7) or similar cylindrical elements, of which it has threaded ends and has a central part of internally flat surface, characterized in that said span (1) consists of a monobloc and solid carbon steel body (F-1 o similar) o acero inoxidable (AISI 316 ó 304), cuya parte central (4), que interiormente es de superficie plana (5), presenta una superficie superior (F-1 or similar) or stainless steel (AISI 316 or 304), whose central part (4), which internally has a flat surface (5), has an upper surface (6) de configuración variable. (6) variable configuration. 2.-ABARCÓN MONOPIEZA, según la reivindicación 1, caracterizado porque la parte central 2.-MONOPIEZA ABARCON, according to claim 1, characterized in that the central part (4) del cuerpo monobloque que constituye el abarcón (1) presenta una superficie superior (6) de configuración redondeada en su centro. (4) of the monobloc body constituting the embankment (1) has a rounded upper surface (6) in its center. 3.-ABARCÓN MONOPIEZA, según la reivindicación 1, caracterizado porque la parte central 3.-MONOPIEZA ABARCON, according to claim 1, characterized in that the central part (4) del cuerpo monobloque que constituye el abarcón (1) presenta una superficie superior (6) de configuración angulada a dos vertientes (4) of the monobloc body that constitutes the embankment (1) has an upper surface (6) of angled configuration on two slopes 4.-ABARCÓN MONOPIEZA, según la reivindicación 1, caracterizado porque la parte central 4.-MONOPIEZA ABARCON, according to claim 1, characterized in that the central part
(4) (4)
del cuerpo monobloque que constituye el abarcón (1) presenta una superficie superior (6) de configuración angulada a dos vertientes que abarcan solo su parte central. of the monobloc body that constitutes the embankment (1) has an upper surface (6) of angled configuration to two slopes that cover only its central part.
(4) (4)
del cuerpo monobloque que constituye el abarcón (1) of the monobloc body that constitutes the stump (1)
5.-ABARCÓN MONOPIEZA, según la reivindicación 1, caracterizado porque la parte central presenta una superficie superior ( 6) de configuración formando una elevación redondeada en la parte central 5. MONOPIEZA COAT, according to claim 1, characterized in that the central part has an upper surface (6) of configuration forming a rounded elevation in the central part
6.-6.-
PROCEDIMIENTO DE FABRICACIÓN DE UN PROCESS FROM MANUFACTURING FROM A
ABARCÓN ABARCON
MONOPIEZA, tal como el descrito en las MONOPIEZA, such how he described in the
reivindicaciones claims
1 a 5, caracterizado porque one to 5, characterized why
comprende understands
los siguientes pasos: the Next steps:
--
Se parte de una pieza (2) metálica en forma de barra cilíndrica o quot;redondoquot;, It starts from a metal part (2) in the form of a cylindrical bar or "round";
--
Los extremos de dicha pieza (2) se someten a un proceso de mecanizado para realizar sendas espigas roscadas (3), The ends of said piece (2) are subjected to a machining process to make two threaded pins (3),
--
Posteriormente se somete a la pieza (2) a un proceso de laminado o estampado en caliente para modificar el perfil de su parte central (4) proporcionándole una superficie plana (5) por su parte inferior y una forma superior (6) según, las necesidades de cada aplicación. Subsequently, the piece (2) is subjected to a hot rolling or stamping process to modify the profile of its central part (4) by providing a flat surface (5) for its lower part and an upper shape (6) according to the needs of each application.
Finalmente, se curva la pieza (2) para otorgarle la forma en U mediante conformado en frío, Finally, the piece (2) is curved to give it the U-shape by cold forming,
con with
prensa hidráulica y matriz. hydraulic press and matrix.
7.-7.-
PROCEDIMIENTO DE FABRICACIÓN DE UN PROCESS FROM MANUFACTURING FROM A
ABARCÓN ABARCON
MONOPIEZA, según la reivindicación 6, MONOPIEZA, according the claim 6,
caracterizado characterized
porque la pieza (2) en forma de barra es why the piece (2) in shape from bar is
de from
longitud variable con un diáme tro de entre 15 a 100 variable length with a give me tro  from between fifteen to 100
mm. mm
en función del ancho que se precise para la in function of the width that be specify for the
pletina. platen.

8.-PROCEDIMIENTO DE FABRICACIÓN DE UN ABARCÓN MONOP IEZA, según las reivindicaciones 6 y 7, caracterizado porque las espigas roscadas (3) tienen

8.-MANUFACTURING PROCEDURE OF A MONOP IEZA COAT, according to claims 6 and 7, characterized in that the threaded pins (3) have
longitud la rosca thread length
y en diámetro variables, entre M/6 a M/30. siendo el fileteado de and in Variable diameter, between M / 6 to M / 30. being he filleted from
5    5
9.-PROCEDIMIENTO DE FABRICACIÓN DE ABARCÓN MONOPIEZA, según las reivindicaciones 6 a caracterizado porque las medidas del abarcón obtenido van desde DN 15 mm hasta DN 500 mm. UN 8, (1) 9.-MANUFACTURING PROCESSING OF ONE-PIECE ABARCON, according to claims 6, characterized in that the measurements of the obtained span range from DN 15 mm to DN 500 mm. UN 8, (1)
ES201001512A 2010-11-26 2010-11-26 ABARCON MONOPIEZA AND MANUFACTURING PROCEDURE OF THE SAME Expired - Fee Related ES2400760B1 (en)

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CN104475510A (en) * 2014-11-14 2015-04-01 中航飞机股份有限公司西安飞机分公司 Secondary bending forming method of T-section profile and bending die

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US6234541B1 (en) * 1998-02-18 2001-05-22 Donaldson Company, Inc. U-bolt clamp for sealing lap joints
ES2289178T3 (en) * 2001-10-23 2008-02-01 Consolidated Metal Products, Inc. METHOD OF MANUFACTURING A BOLT IN A FLAT.
KR20100045797A (en) * 2008-10-24 2010-05-04 현대자동차주식회사 Leaf spring mounting unit for vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6234541B1 (en) * 1998-02-18 2001-05-22 Donaldson Company, Inc. U-bolt clamp for sealing lap joints
ES2289178T3 (en) * 2001-10-23 2008-02-01 Consolidated Metal Products, Inc. METHOD OF MANUFACTURING A BOLT IN A FLAT.
KR20100045797A (en) * 2008-10-24 2010-05-04 현대자동차주식회사 Leaf spring mounting unit for vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104475510A (en) * 2014-11-14 2015-04-01 中航飞机股份有限公司西安飞机分公司 Secondary bending forming method of T-section profile and bending die
CN104475510B (en) * 2014-11-14 2016-06-01 中航飞机股份有限公司西安飞机分公司 A kind of y-shaped cross-section section bar draws o ing method and draws bending mould for two times

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