EP2954957A1 - Protective device and method implementing such a device - Google Patents

Abstract

Protective device (1) for a part of the part to be protected comprising a separable body (2) in at least two sub-elements (4, 5), each sub-element (4,5) comprising a cavity (6, 7) intended to at least partially accommodating the part part to be protected, the device comprising means for holding in position (4.11, 4.12, 4.21, 4.22, 5.11, 5.12, 5.21, 5.22) sub-elements (4, 5) relative to each other by relative to the others and at least one of the sub-elements (4, 5) comprising a portion of its cavity (6, 7) which is provided with a surface (30, 31) opposing the relative sliding of the protective device (1). ) and the part of the room to be protected.

Description

FIELD OF THE INVENTION

The present invention relates to the field of surface treatment and more particularly that of the protection and masking of elements during the application of a surface treatment.

BACKGROUND OF THE INVENTION

When applying a surface treatment to a workpiece such as sanding, painting or metallizing, there are generally parts of the workpiece that are desirable to preserve from processing . They may be threaded or threaded elements, machined surfaces such as piston rods, or parts of the part having received or to receive a surface treatment different from that which is applied. Conventionally such parts of the room are protected by covers made of cardboard plates held with high performance adhesive tape on the portion to be protected, or flexible lead plates for operations such as sanding or metallization.

It frequently happens that the glued adhesive tape, or its adhesion by sticking to the workpiece, degrades due to environmental conditions or under the effect of the treatment applied to the workpiece. The caches slip, stop protecting the part to preserve which results in costly or even impossible non-conformities that lead to the scrapping of the complete part. The operations of installation and removal of such caches are long and impact the production time. The adhesive tape used is usually removed using sharp tools that can damage the workpiece and / or injure operators and / or leave residue on the workpiece. Finally, these caches represent a large volume of waste rarely recyclable due to the nature of the products that cover them.

OBJECT OF THE INVENTION

An object of the invention is to reduce the risk of degradation of the workpiece during such operations.

SUMMARY OF THE INVENTION

For this purpose, provision is made according to the invention, a protective device of a part of the part to be protected comprising a separable body in at least two sub-elements, each sub-element comprising a cavity intended to accommodate at least partially the part part. to protect. The device comprises means for holding the relative sub-elements in position relative to each other and at least one of the sub-elements comprises a portion of its cavity which is provided with a surface which opposes the relative sliding of the protection device and of the part of the room to be protected.

Thus, the device provides a protection whose installation and removal are facilitated by the separable character thereof. Maintaining the protection device on the workpiece with a surface opposing the relative sliding of the device and the part of the part to be protected eliminates the use of cutting tools and the risk of damage to the workpiece resulting in it.

Advantageously, the separable body of the device is of cylindrical shape and the means for holding the sub-elements relative to one another in relation to each other comprise at least one magnetic element.

Preferably, according to this last embodiment, at least one of the magnetic elements is a permanent magnet carried by one of the sub-elements. separable body, this permanent magnet is arranged to cooperate with another magnetic element which is carried by another sub-elements to maintain in position these two sub-elements relative to each other.

According to a particular embodiment, the surface opposing the relative sliding of the device and the part to be protected comprises a material having a dry adhesion factor on steel which is greater than 0.6, this material preferably being rubber.

Preferably, the separable body is covered with silica at its outer periphery, which facilitates cleaning in order to prolong its reuse.

More preferably, the separable body is a right circular cylindrical sleeve separable into a first and a second half sleeve in a plane passing through a longitudinal axis of the sleeve and which defines joining surfaces of the first and second half sleeves, these joining surfaces. are of complementary shape to each other so as to limit the passage of material between the inside and outside of the sleeve when these half sleeves are joined.

Preferably, according to this last embodiment, the junction surfaces of the first half-sleeve comprises at least one element exerting a magnetic attraction on a corresponding element of the second half-sleeve.

• mise en place du dispositif de protection selon l'un quelconque des modes de réalisation de l'invention autour d'une partie de la pièce de manière à protéger cette partie de la pièce en l'entourant avec le dispositif de protection;
• réalisation d'une opération de traitement de surface sur la pièce, la partie de la pièce entourée avec le dispositif de protection étant préservée du traitement de surface par le dispositif de protection.

Finally, the invention also comprises a method of treating a surface of a part comprising the steps of:

• placing the protection device according to any one of the embodiments of the invention around a part of the part so as to protect this part of the part by surrounding it with the protective device;
• performing a surface treatment operation on the part, the part of the part surrounded with the protective device being preserved from the surface treatment by the protection device.

Typically, when you spare a room with a tape, you can leave glue on the piece or when cutting the tape, you can scratch the room and compromise its quality.

• d'une part de pouvoir simplement épargner une surface de la pièce que l'on ne souhaite pas atteindre par l'opération de traitement de surface ; et
• d'autre part de pouvoir, une fois le traitement de surface réalisé, simplement retirer le dispositif de protection sans risque d'endommagement de la pièce.

The advantage of this process is:

• on the one hand simply to be able to save a surface of the part that one does not wish to reach by the surface treatment operation; and
• on the other hand of power, once the surface treatment performed, simply remove the protective device without risk of damage to the room.

According to a particular embodiment of the method according to the invention, after the step of performing the surface treatment operation on the part, it implements a step of removing the protection device.

According to a particular embodiment of the method according to the invention, the surface treatment operation is an operation consisting in producing a coating on a surface of the part which is at least partially delimited at its periphery by the protection device.

According to a particular embodiment of the method according to the invention, the coating is a paint or a metal deposit.

According to a particular embodiment, the method according to the invention, the protection device and the part are shaped so that when the protective device is set up around the part of the part, then the part has a surface portion protected in a watertight manner by the protective device.

By watertightness, it is meant that the watertight protected surface must be able to be immersed with the protective device put in place under at least 1 meter of water at 20 ° C without the surface thus protected is not wet.

This seal is achieved via a seal placed around the surfaces opposing sliding and / or via a close contact of these surfaces opposing sliding against the protected surface.

• dans un bain d'acide si le matériau des surfaces de glissement est inerte à l'acide ; ou
• dans un bain de peinture ; ou
• dans un bain de métallisation électrolytique pour traiter localement une portion de surface de la pièce tout en épargnant la surface protégée qui reste sèche.

This embodiment makes it possible, for example, to immerse the part:

• in an acid bath if the material of the sliding surfaces is acid-inert; or
• in a paint bath; or
• in an electrolytic plating bath for locally treating a surface portion of the workpiece while sparing the protected surface which remains dry.

This sealing is favored by the use of the means for holding in position relative sub-elements relatively to each other which are preferably arranged to force the support of said seals and / or said surfaces opposing sliding against the workpiece.

• d'une part, par le fait que la surface anti glissement est dans un matériau présentant préférentiellement un facteur d'adhérence à sec sur de l'acier qui est supérieur à 0.6 ; et d'autre part par le fait que les moyens de maintien en position forcent le contact entre la surface de pièce épargnée et les surfaces du dispositif de protection qui s'opposent à son glissement relatif par rapport à la pièce.

There is thus a protective device that is adhering to the part:

• on the one hand, in that the anti-slip surface is in a material preferably having a dry adhesion factor on steel which is greater than 0.6; and on the other hand, by the fact that the holding means in position force the contact between the spared part surface and the surfaces of the protection device which oppose its relative sliding with respect to the part.

BRIEF DESCRIPTION OF THE DRAWINGS

• la figure 1 est une vue schématique en perspective du dispositif de protection selon l'invention ;
• la figure 2 est un vue en coupe transversale du dispositif de la figure 1 suivant un plan de coupe transversale II-II ;
• la figure 3 est une vue schématique en perspective éclatée du dispositif de la figure 1 ;
• les figures 4a, 4b, 4c, 4d illustrent les étapes successives mises en oeuvre pour la réalisation du procédé selon l'invention de traitement d'une surface d'une pièce ;
• la figure 5 est une vue schématique en perspective éclatée d'un deuxième mode de réalisation du dispositif selon l'invention.

The invention will be better understood on reading the following description of non-limiting embodiments, with reference to the figures of the appended drawings among which:

• the figure 1 is a schematic perspective view of the protection device according to the invention;
• the figure 2 is a cross-sectional view of the device of the figure 1 along a cross-sectional plane II-II;
• the figure 3 is a schematic exploded perspective view of the device of the figure 1 ;
• the Figures 4a, 4b, 4c, 4d illustrate the successive steps used for carrying out the method according to the invention for treating a surface of a part;
• the figure 5 is a diagrammatic perspective exploded view of a second embodiment of the device according to the invention.

DETAILED DESCRIPTION OF THE INVENTION

With reference to Figures 1 to 3 the protective device, generally designated 1, comprises a sleeve 2 of circular cylindrical shape made of rubber extending along a longitudinal axis X. This comprises a concentric longitudinal cylindrical cavity 3 of the right circular cylindrical shape and an outer covering in silica. The silica makes it possible to limit the paint catch on the sleeve and thus makes it easier to clean the sleeve.

The sleeve 2 is separable into two sub-elements in the form of a first half-sleeve 4 and a second half-sleeve 5 along a plane P passing through the longitudinal axis X. The plane P then defines rectangular surfaces. junction 4.1 and 4.2 of the first half sleeve 4 cooperating with corresponding junction surfaces 5.1 and 5.2 of the second half sleeve 5. As visible in Figures 1 to 3 the joining surfaces 4.1 and 4.2 extend parallel to the longitudinal axis X on either side of a first portion 6 of the cavity 3 corresponding to the cavity of the part 23 of the part 20 to be protected in each half sleeves 4, 5. The half sleeve 5 comprises a second cavity portion 7 bordered by the junction surfaces 5.1 and 5.2. The junction surfaces 4.1 and 4.2 respectively comprise two parallelepiped inserts, 4.11, 4.12, 4.21 and 4.22 extending parallel to the longitudinal axis X and made of magnetic material, here a neodymium alloy forming a permanent magnet. The half sleeve 5 comprises metal inserts 5.11, 5.12, 5.21 and 5.22 intended to cooperate with the inserts 4.11, 4.12, 4.21 and 4.22 of the half sleeve 4. Preferably, some of the inserts forming magnets and some of the metal inserts attached to the half sleeves 4, 5 are arranged at the longitudinal ends of the sleeve 2 so as to prevent spacing of the half sleeves 4, 5 relative to each other at the longitudinal ends of the sleeve 2. Note that these inserts forming magnets and / or some of the metal inserts may be covered with a thin film to limit the risk of degradation of these inserts (eg risk of oxidation) and to limit the risk of damaging the protected part by contact with these inserts.

The implementation of the protection device 1 is now described with reference to Figures 4a, 4b, 4c, 4d in application to the surface treatment of a workpiece, here a landing gear rod 20 for aircraft. The landing gear rod 20 is made of metal and comprises a first portion 21 to receive a surface treatment - here a metallization - separated by a boundary 22 of a second part 23 to be protected because it must not receive metallization ( figure 4a ). The operator then sets up the half sleeve 4 and 5 on the second part 23 so as to cooperate the first and second portions 6 and 7 of the cavity 3 with the part 23 to be protected from the metallization ( figure 4c ). In this situation, the protective device 1 partially covers the landing gear rod 20, part of which extends outside the protective device 1. The parallelepiped inserts 4.11, 4.12, 4.21 and 4.22 then face the metal inserts 5.11, 5.12 , 5.21 and 5.22 and the magnetic attraction keeps the half sleeves 4 and 5 in contact. This magnetic attraction also presses the surfaces 30, 31 forming the cavities 6 and 7 against the second portion 23 of the landing gear rod 20, which has the effect of preventing relative sliding of the half sleeves 4 and 5 with respect to the landing gear rod 20 due to the particular coefficient of friction between the metal of the landing gear rod 20. Here, the cavity-forming surfaces are provided with a material having a dry adhesion factor on the upper steel at 0.6. This material is rubber forming the half-sleeves 4 and 5. In this configuration, one end of the sleeve 3 coincides with the border 22. Preferably, the sleeve is shaped so that when it is positioned on the part, it then prevents the fluid penetration against the protected surface of the part 20. The metallization operation is performed by dipping the assembly sleeve and piece in a metallization bath and the first portion 21 of the rod 20 then receives the metallization treatment. The portion 23 protected by the sleeve remains free of metallization. At the end of the metallization, the two half sleeves 4 and 5 are deposited.

Elements identical or similar to those previously described will bear a numerical reference increased by one hundred in the description which follows of the second embodiment.

With reference to the figure 5 , the cavity portions 106 and 107 of the half sleeves 104 and 105 comprise longitudinal inserts 30 and 31 of an adherent elastomeric material such as rubber. Thus, when the half sleeves are put in place on the part of the part to be protected 123, these inserts are opposed to the relative sliding of the sleeves and the portion of the part to be protected.

Of course, the invention is not limited to the embodiments described but encompasses any variant within the scope of the invention as defined by the claims.

• bien qu'ici le corps séparable du dispositif soit de forme cylindrique circulaire droite, l'invention s'applique également à d'autres formes de corps séparable, comme par exemple un corps tubulaire de section carrée ou quelconque ou un corps parallélépipédique comprenant une cavité ;
• bien qu'ici le corps du dispositif de protection soit séparable en deux demi manchons, l'invention s'applique également à un corps séparable en trois sous éléments ou plus ;
• bien qu'ici le corps du dispositif de protection comprenne une cavité cylindrique longitudinale, l'invention s'applique également à d'autres formes de cavités telles que des cavités pouvant accueillir des singularités de la pièce comme par exemple une bride, un épaulement, un raccord ;

• bien qu'ici les surfaces de jonctions des demi manchons comprennent chacune deux inserts rectangulaires, l'invention s'applique également à un insert unique, ou plus de deux insert. L'invention s'applique également à d'autres formes d'insert comme par exemple des inserts circulaires ou de forme quelconque ;
• bien qu'ici le premier demi manchon comprenne des inserts réalisés en matériau magnétique et coopérant avec des inserts métalliques du deuxième demi manchon, l'invention s'applique également à d'autres moyens de maintien en position des manchons entre eux comme par exemple un revêtement auto agrippant de type velcro ®, des surfaces autocollantes repositionnables ou un fermeture à glissière;
• bien qu'ici le manchon soit en caoutchouc, l'invention s'applique également à des manchons réalisés en d'autres matériaux comme par exemple le métal, le bois ou les matières synthétiques ;
• bien qu'ici le corps séparable comprenne deux demi manchons dont les cavités sont pourvues chacun d'un insert longitudinal en une matière élastomère adhérente, l'invention s'applique également à un corps comprenant un unique sous élément pourvus d'un insert longitudinal en une matière élastomère adhérente ;
• bien qu'ici, les cavités des demi manchons comprennent des inserts longitudinaux en une matière élastomère adhérente, l'invention s'applique également à d'autres types de portions de la cavité pourvue d'une surface s'opposant au glissement comme par exemple des sections annulaires ou une pluralité de pastilles circulaires
• bien qu'ici les sous éléments du corps séparable sont présentés comme pouvant être disjoints l'un de l'autre lorsqu'ils sont séparés, il est aussi possible qu'ils soient liés entre eux par un lien souple autorisant la séparation et l'écartement de ces sous éléments tout en maintenant une attache souple imposant une distance d'écartement maximale entre ces éléments séparables (ceci limite le risque d'égarer un des sous éléments tout en facilitant la manipulation des sous éléments lorsqu'ils sont séparés).

In particular,

• although here the separable body of the device is of straight circular cylindrical shape, the invention also applies to other forms of separable body, such as for example a tubular body of square section or any or a parallelepiped body comprising a cavity ;
• although here the body of the protective device is separable into two half sleeves, the invention also applies to a separable body in three or more sub-elements;
• although here the body of the protective device includes a cylindrical cavity longitudinal, the invention also applies to other forms of cavities such as cavities that can accommodate singularities of the part such as a flange, a shoulder, a connection;

• although here the junction surfaces of the half sleeves each comprise two rectangular inserts, the invention also applies to a single insert, or more than two insert. The invention also applies to other forms of insert such as circular inserts or any shape;
• although here the first half-sleeve comprises inserts made of magnetic material and cooperating with metal inserts of the second half-sleeve, the invention also applies to other means for holding the sleeves in position together, such as for example a Velcro ® type Velcro® self-adhesive coating, repositionable self-adhesive surfaces or zipper;
• although here the sleeve is rubber, the invention also applies to sleeves made of other materials such as metal, wood or synthetic materials;
• although here the separable body comprises two half-sleeves whose cavities are each provided with a longitudinal insert made of an adherent elastomeric material, the invention also applies to a body comprising a single sub-element provided with a longitudinal insert in an adherent elastomeric material;
• although here, the cavities of the half-sleeves comprise longitudinal inserts in an adherent elastomeric material, the invention is also applicable to other types of portions of the cavity provided with a surface that opposes sliding, for example annular sections or a plurality of circular pellets
• although here the sub-elements of the separable body are presented as being separable from each other when they are separated, it is also possible that they are linked together by a flexible link allowing separation and separation. spacing these sub-elements while maintaining a flexible fastener imposing a maximum distance between these separable separable elements (this limits the risk of mislaying one of the sub-elements while facilitating the handling of sub-elements when they are separated).

Claims (14)

Protective device (1) for a part of a part to be protected (23) comprising a separable body (2) in at least two sub-elements (4, 5), each sub-element (4,5) comprising a cavity (6, 7) for at least partially accommodating the part part to be protected (23), the device comprising means for holding in position (4.11, 4.12, 4.21, 4.22, 5.11, 5.12, 5.21, 5.22) sub-elements (4, 5) relatively to each other and at least one of the sub-elements (4, 5) comprising a portion of its cavity (6, 7) which is provided with a surface (30, 31) opposing the relative sliding of the protection device (1) and the part of the part to be protected (23). Protective device (1) according to claim 1, wherein the separable body (2) is cylindrical in shape. Protective device (1) according to any one of claims 1 or 2, wherein the means for holding in position (4.11, 4.12, 4.21, 4.22, 5.11, 5.12, 5.21, 5.22) sub-elements (4,5) relatively to each other comprise at least one magnetic element (4.11, 4.12, 4.21, 4.22). Protective device (1) according to claim 3, wherein at least one of the magnetic elements is a permanent magnet carried by one of the under elements (4, 5) of the separable body, this permanent magnet being arranged to be able to cooperate with another magnetic element which is carried by another sub-elements (4, 5) to maintain in position these two sub-elements (4, 5) relative to each other. Protective device (1) according to any one of claims 1 to 4, wherein the surface (30, 31) opposing the relative sliding of the device and the part of the part to be protected comprises a material having a dry adhesion factor on steel which is greater than 0.6. Protective device according to claim 5, wherein the surface against sliding is rubber. Protective device (1) according to any one of claims 1 to 6, wherein the separable body (2) is covered with silica at its outer periphery. Protective device (1) according to any one of claims 1 to 7, wherein the separable body (2) is a right circular cylindrical sleeve separable into a first and a second half sleeve (4, 5) in a plane (P ) passing through a longitudinal axis (X) of the sleeve and which defines joining surfaces (4.1, 4.2) of the first and second half sleeves (4, 5), these joining surfaces being of complementary shape to each other so as to limit the passage of material between the inside and the outside of the sleeve when these half sleeves are joined. Protective device (1) according to claim 8, wherein the joining surface of the first half-sleeve (4) comprises at least one element (4.11, 4.12, 4.21, 4.22) exerting a magnetic attraction on a corresponding element (5.11, 5.12 , 5.21, 5.22) of the second half-sleeve (5). A method of treating a surface of a workpiece (20) comprising the steps of: - Implementation of the protective device (1) according to any one of claims 1 to 9 around a portion (22) of the part (20) so as to protect this part (22) of the part (20). surrounding it with the protective device (1); - Performing a surface treatment operation on the part (20), the part of the part surrounded by the protection device (1) is preserved from the surface treatment by the protection device (1). Surface treatment method according to claim 10, comprising after the step of performing the surface treatment operation on the workpiece, a step of removing the protective device (1). A surface treatment method according to any one of claims 10 or 11, wherein the surface treatment operation is an operation of providing a coating on a surface of the workpiece which is at least partially delimited at its periphery by the protection device (1). A surface treatment method according to claim 12, wherein the coating is a paint or a metal deposit. A surface treatment method according to any one of claims 10 to 13, wherein the protection device (1) and the workpiece (20) are shaped so that when the protective device (1) is put in place around the part (23) of the part (20), then the part has a surface portion protected in a watertight manner by the protective device (1).

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