RU2105908C1 - Hold-down used in bonding parts - Google Patents

Abstract

FIELD: clamping parts and units to be bonded together, for example, parts on aircraft wing or fuselage. SUBSTANCE: device includes working chamber with hold-down connected with pressure source and vacuum chambers for holding the working chamber on surface of article being bonded. Working chamber consists of at least two sections articulated together. Working and vacuum chambers are interconnected by means of hinges and rods of varying length. Diameter of vacuum chambers may be selected from the proposed relationship. Device extends technological capabilities especially for surfaces of double curvature and different height for securing the vacuum chambers. EFFECT: extended technological capabilities. 3 cl, 2 dwg

Description

 The invention relates to mechanical engineering, namely to clamping devices used for fastening glued curvilinear parts, such as, for example, the wing surfaces or the fuselage of an airplane.

A device for mounting an article of manufacture is known, comprising a housing with evenly spaced arms, each of which contains an elastic vacuum suction cup [1]
In devices of this type, although reliable fixing is achieved on the surface, reliable fixation on surfaces having double curvature is not ensured.

A device for gluing parts is also known, comprising a working chamber with a clamping element disposed in it and connected to a pressure source, and a vacuum network [2]
This embodiment of the device allows to simplify fixing it on surfaces having protrusions, through holes, etc. however, it cannot be used for pressing on surfaces whose working area has both single and double curvature of large sizes.

 The objective of the present invention is to avoid the aforementioned disadvantages and to create such a device that, with the relative simplicity of the design, would ensure work in hard to reach places with stepped support surfaces and work on surfaces having both single and double curvature.

где D суммарный диаметр вакуумных камер, мм;
S площадь опорной поверхности рабочей камеры, мм²;
P_u величина избыточного давления, МПа;
m коэффициент трения покоя системы резина-металл.This is achieved due to the fact that the device for pressing when gluing parts containing a working chamber with a clamping element connected thereto connected to a pressure source, and a vacuum network equipped with vacuum chambers connected to the vacuum network located on the periphery of the working chamber and connected to it, wherein the working chamber is made of at least two sections pivotally connected to each other. In addition, it is proposed that the working chamber and vacuum chambers be interconnected by means of hinges and rods of variable length, and the diameter of the vacuum chambers should be selected from the ratio

where D is the total diameter of the vacuum chambers, mm;
S the area of the supporting surface of the working chamber, mm ² ;
P _{u the} value of excess pressure, MPa;
m the rest coefficient of friction of the rubber-metal system.

 In FIG. 1 shows a General view of the device; in FIG. 2, a device mounted on a surface having double curvature.

 The device for pressing when gluing parts contains a working chamber 1 (Fig.1,2), limited by box sections 2, 3, 4, and vacuum chambers 5 - 8, which are interconnected by hinges 9 12 and 13 16 and adjustable rods 17 24 coupled by couplings 25 28. The working chamber 1 is made in the form of a closed flexible shell, the lower part of which is supported by a flexible elastic heater 29, resting through the glued part 30 and a layer of glue 31 on the curved repaired surface of the casing 32, and the upper one in box sections 2 , 3, 4, Connections between a hinge 33, 34 and the mutually facing end faces. The middle section 3 is equipped with a fitting 35, designed to connect the working chamber 1 through a hose 36 to a pressure source. The lateral sections 2, 4 are equipped with racks 37 40, through which the vacuum chambers 5 8 are equipped with hinges 9 14 and rods 17 24, equipped with fittings 41 44 connected to the vacuum system 45, 46. To maintain a constant temperature during gluing of the part 30 to the repaired surface 32 the device is equipped with a thermocouple 47.

 The operation of the device is as follows.

 The surface to be trimmed 32 at the place of installation of the glued part 30 is degreased according to the gluing technology, an adhesive layer 31 is applied to the prepared surface, on which the glued part 30 is laid. A thermocouple 47 is installed on the glued part 30, for example (chromel drops), an elastic heater 29, working the chamber 1 together with sections 2, 3, 4. Section 3 through the fitting 35 is connected to the hose 36 of the pressure source. Along the perimeter of the working chamber 1 at a distance corresponding to the length of the rods 17 24 and couplings 25 28, with the help of hinges 9 16 vacuum chambers 5 8 with racks are installed. A vacuum system 45, 46 is connected to the fittings 41 44. After installing the vacuum chambers and the working chamber 1, a vacuum is supplied to the system 45, 46. The vacuum chambers 5 8 due to atmospheric pressure are pressed against the casing 32, after which, with the help of couplings 25 28, the uniform tension of the sections 2, 3, 4 is regulated. By adjusting the uniform tension of the sections 2, 3, 4, excess pressure is supplied through the chamber 36, which presses the part 30 through the layer of glue 31 and the heater 29 to the skin 32.

 When installing the device on a product with a large curvature, the working chamber 1 and sections 2, 3, 4 (in Fig. 1) due to the articulation of the sections repeats the curvature of the product and ensures reliable pressing of the heater 29 and the glued part 30 to the product.

где D общий диаметр вакуумных (присосок) камер, мм;
m коэффициент трения покоя системы резина-металл;
S площадь прижимного элемента, мм²;
P_u величина избыточного давления, МПа.To exclude the separation of the device from the surface to which it is pressed under the action of excessive pressure in the clamping element, between the diameter of the vacuum chambers (suction cups) and the area of the clamping element must be the ratio

where D is the total diameter of the vacuum (suction cups) chambers, mm;
m coefficient of rest friction of the rubber-metal system;
S area of the clamping element, mm ² ;
P _{u the} value of excess pressure, MPa.

 A clamping device made in this way when gluing parts will expand its technological capabilities, especially when used on surfaces with double curvature.

Claims (3)

 1. A device for pressing when gluing parts, comprising a working chamber with a clamping element disposed therein connected to a pressure source, and a vacuum network, characterized in that it is equipped with vacuum chambers connected to the vacuum network located on the periphery of the working chamber and connected to it while the working chamber is made of at least two sections pivotally connected to each other.  2. The device according to claim 1, characterized in that the working chamber and the vacuum chambers are interconnected by means of hinges and rods of variable length. 3. The device according to PP.1 and 2, characterized in that the diameter of the vacuum chambers is selected from the ratio

where D is the total diameter of the vacuum chambers, mm;
m coefficient of friction of the rest of the system rubber metal;
S the area of the supporting surface of the working chamber, mm ² ;
P _{and the} magnitude of the excess pressure, MPa.

Images