Showing papers on "Sheet metal published in 1987"

Cold roll-formed structures and method and apparatus for producing same.

Abstract: A cold-forming method for thinning localized, longitudinally extending portions of sheet metal (21) by lateral shear deformation without any substantial longitudinal deformation. With such method, it is possible to produce elongated members (10) which are thinned in zones of low stress and are thicker in zones of higher stress so as to provide high metal use efficiency. The method is performed by an apparatus including a rotating mandrel (41) providing opposed conical surfaces (47), (48) and pressure rolls (51, 52) operable to apply forces substantially perpendicular to the axis of rotation of the mandrel (41) to cause a portion of the sheet metal (21) to yield in shear to reduce the thickness of longitudinally extending portions of the sheet metal. The forces are applied in a plane normal to the length of the strip (21) in order to avoid longitudinal elongation.

Drawing installation for a press

Abstract: A drawing installation for a press which has to produce the holding force for the counter-holding during the drawing. The drawing ram displaces the sheet metal part and the sheet metal holder against the holding force to be produced by the drawing installation and must additionally overcome the inertia forces which occur as a result of the acceleration of the parts of the drawing installation at the beginning of the deformation of the sheet metal part. In order to avoid the forces which occur thereby impact-like, the piston rod transmitting the holding force is pre-accelerated in the drawing direction prior to the contact of the drawing ram on the sheet metal holder. The piston rod has an operating surface adapted to be acted upon in the drawing direction. The pressure space coordinated to the operating surface is adapted to be connected with a pressure quantity space of a pre-acceleration cylinder and with a reservoir by way of a follow-up control. The control with respect to time of the pre-acceleration cylinder and of the refill from the reservoir takes place in dependence on the movement of the drawing ram, controlled by the press. The drawing installation is utilizable in presses with mechanically driven drawing ram and a sheet metal holder holding the sheet metal part.

Bodywork for a vehicle, in particular for an automobile, and process for manufacturing it

Abstract: An automotive bodywork constructed as a floor pan formed by a platform frame. The platform frame has a structure of the "sandwich" type. It is constructed by overlapping three sheet metal sheets. The intermediate sheet of these three metal sheets is undulated and secured to the other two sheets of metal. Each of the other two sheets of metal are integrally secured to the undulated intermediate sheet where the crests of the undulations contact each other sheet.

Economical spectrometer unit having simplified structure

Abstract: A spectrometer construction is shown in which the chassis (32) of the spectrometer is fabricated by stamping, punching, and bending sheet metal, the mirror supports (58, 66) and other elements are also formed from sheet metal. Precision locations are assured by tab and slot matching of the sheet metal parts. The mirrors in the spectrometer, other than those in the interferometer (36), are secured directly to vertical sheet-metal walls without intervening adjustments. The mirrors (54, 56, 60, 62) have unitary reflection and backing structures formed either by a diamond-cutting lathe, or by precision plastic molding.

Process for the production of a shaped member from pieces of sheet metal of different thicknesses

Abstract: A shaped member of welded pieces of sheet metal of different thickness, more particularly having a metallic anti-corrosion protection, for example of zinc, on at least one side, wherein the pieces of sheet metal are joined to one another by a laser-beam-butt-welding process and shaped as a unit.

An Analysis of Drawbeads in Sheet Metal Forming: Part II—Experimental Verification

Abstract: This paper presents experimental results obtained for a variety of drawbeads typical of automotive applications, and compares the results with those obtained from the numerical model presented in the first part of this work (Triantafyllidis et al., 1986). The deformation process is divided into two phases: the \"locking/clamping\" phase as the binder closes to form the sheet around the drawbead, and the '-'pulling\" phase as the panel is formed, causing the material to be drawn through the bead. Metals considered are SKDQ steel, aluminum, and brass. Dry and lubricated conditions are investigated. Good correlations between model and experiment are obtained for strain distributions over the sheet and excellent agreement is observed in the binder clamping forces. Using a Coulomb friction law in the model, horizontal restraining forces are compared to experimental results. The model is shown to accurately predict the influence of variations in material, geometry, and friction conditions. However, the correlation between the model and experiment is not as good in two cases: as the punch (male bead) reaches the \"locked\" condition, and in the initial stages of \"pulling\" deformation. Reasons for the discrepancies are discussed.

Simultaneously cutting and welding sheet metal using laser energy

Abstract: A method of simultaneously cutting and welding metal, especially relatively thin sheets of metal, utilizing laser energy. The invention uses surface tension in the globule created at the site of the impingement of the laser beam on the work to form finished edges on both sides of the line of cut. A laser beam surrounded by a thin shield of inert gas is used, the gas removing some of the molten metal but leaving sufficient to form the beads which comprise the finished edges on both sides of the cut, and also preventing oxidation of the beads.

Method of mechanically crimping overlapping sheet metal

Abstract: A method of joining first and second flat sheet metal portions in overlapping relation one above the other to form a joint in the two sheet metal portions. Metal adjacent and spaced from one free edge of a first sheet metal portion is cut parallel to the free edge and expanded to form a generally U-shaped female receptacle arcuately domed and tapered inwardly and downwardly in a direction away from the free edge. The second sheet metal portion is cut in a truncated V-shape and the V-shape cut is bent to form a generally truncated, V-shaped male prong bent at an angle with respect to the second sheet metal portion. The first and second sheet metal portions are forced into overlapping engagement, one above the other, progressively, while directing the male prong into the female receptacle. The overlapped sheet metal portions then are crimped or pressed together to flatten the domed female receptacle and form complementary L-shaped bends in the two sheet metal portions, secured on both sides of foot portions of the L-shaped bends with metal from the other sheet metal portion.

Application of liquid to web or is sheet metal

Abstract: Accurately predetermined quantities of liquid can be applied from a plurality of needle like or capillary jets (17) to web or sheet material (14) which is moving continuously relative to said jets. The liquid is supplied to the jets (17) at superatmospheric pressure via respective electromechanical valves (20), which are controlled by computer to open and close rapidly so that liquid is fired from the jets (17) in a succession of short pulses. Thus, small quantitites of treatment liquids can be uniformly applied and, in specific cases where the liquid is colouring medium, pre-programmed patterns can be applied in simple and effective manner. The invention is particularly suited to patterning woven or tufted material (eg cut pile, looped pile or tufted carpet); felt; woven or non woven textiles; paper; board; film; coated or non coated webs. The material may be in sheets or webs.

Manipulator for sheet-metal pieces to be shaped in a sheet-metal-working machine

Abstract: The manipulator for sheet-metal pieces is used in conjunction with a sheet-metal working machine and has two rotatable holding members (20) displaceable in three dimensions. The holding members (20) each have both clamping tongs (22), which act on the surface of the sheet-metal piece (24) to be worked, and a clamping strip (23) exerting pressure parallel to the sheet surface. It thereby becomes possible for the sheet-metal piece to be worked, in a first working phase when it is still plane, to be grasped along two parallel edges by means of tongs and, after the first working, to be held only by means of the clamping strips.

Method and device for press-forming sheet metal

Abstract: A sheet of metal of given thickness is press-formed to provide a part having a substantially constant thickness on a double action press. The sheet to be formed is disposed on a support. A first outer slide, or blank holder is applied on the peripheral portion of the sheet. A second central slide is applied on the central portion of the sheet. The peripheral portion of the sheet is formed while allowing it to slide under the blank holder, by displacing relative to said support at least one active part of the outer slide so as to compensate, in certain regions of the finished part, for excess areas of the sheet, for the given thickness of said sheet, relative to the volume of metal to be formed, and displacing simultaneously with the displacement of the part the central slide so as to shape angular volumes of the central portion of the sheet by application of the sheet against the surfaces of the central part of the support.

Method for producing cold roll-formed structures

Abstract: A cold-forming method is disclosed for thinning localized, longitudinally extending portions of sheet metal by lateral shear deformation without any substantial longitudinal deformation. With such method, it is possible to produce elongated members which are thinned in zones of low stress and are thicker in zones of higher stress so as to provide high metal use efficiency. The method is performed by an apparatus including a rotating mandrel providing opposed conical surfaces and pressure rolls operable to apply forces substantially perpendicular to the axis of rotation of the mandrel to cause a portion of the sheet metal to yield in shear to reduce the thickness of longitudinally extending portions of the sheet metal. The forces are applied in a plane normal to the length of the strip in order to avoid longitudinal elongation.

Apparatus for the wear-free forming of dimensionally accurate sheet-metal components with an at least approximately L-shaped or U-shaped cross-section from sheet-metal blanks or sheet-metal parts

Abstract: The invention relates to an apparatus for the wear-free forming of dimensionally accurate sheet-metal components with an at least approximately L-shaped or U-shaped cross-section from sheet-metal blanks or semi-finished sheet-metal parts, the apparatus having a die-like bottom part with at least one bending roller, acting as a bending edge, and a bending punch which can be lowered into the bottom part. In order to be able to prepare solid sheet-metal components, i.e. comparatively thick-walled sheet-metal components, especially those with non-linear, i.e. bead-shaped, bends with a very good surface finish and in a dimensionally accurate manner and, at the same time, to improve the general service life of the apparatus, the bending roller is itself mounted in bearing bronze or similar material to allow high forming forces at its circumferential forming surface.

Load bearing structures for vehicles

Abstract: A reinforcement 4 is embedded in urethane 5. The structure 1 is as strong as a conventional metal only structure although the reinforcement is thinner than a conventional metal sheet structure. The structure 1 is inherently corrode resistant. The reinforcement may be in the form of metal rods, mesh, pressed metal, sheet metal or glass reinforced resin members and the structure 1 may be a side frame front side member, or door. Also described is a method of making a whole body by joining together several such structures to form a loosely assembled body reinforcement structure with a series of joints J, and moulding polyurethane foam around the body reinforcement structure to form a complete body.

Method and manual apparatus for the semimechanical galvanizing of sheet metal surfaces

Abstract: A method and manual apparatus for the semimechanical galvanizing of sheet metal surfaces according to an absorbent covering, which serves for the post-galvanizing of body sheet metal panels within the area of a damage of the zinc layer. According to this method, the surface of the panal is electrocleaned within the area of the damage with an aqueous alkaline solution by an automatic to and fro movement by means of an absorbent covering secured at the hand apparatus. Thereafter, a zinc electrolyte on an alkaline basis is applied by the movement of the hand apparatus by means of a further absorbent covering connected with the hand apparatus with a current of about 10 to 15 A and a voltage of 11 to 13 V and a zinc layer with a thickness of 8 to 12 μm is produced. An apparatus is provided for the semimechanical galvanizing of sheet metal surfaces, which includes a treatment element forming an anode and including cover elements covering the surface of the treatment element for a zinc electrolyte or a cleaning solution. A tool element is operatively connected to the treatment element and a handle element is connected with the tool element for displacing the treatment element on a surface of a standing-still workpiece as a unit. The tool element automatically carries out relative movements of the treatment element with respect to the standing-still workpiece and the tool element.

Guiding or deflection device of a belt, especially for a safety belt in a motor vehicle

Abstract: 1. A device for guiding or diverting a belt, in particular for a safety belt in a motor vehicle, comprising a sheet metal carrier (2) having a fixing hole (3) and an elongate opening (4) which is arranged at a spacing therebeside, for receiving the belt (1), the opening being provided with slip material, characterised in that the opening (4) which is formed by stamping out and flanging over has a diverting face (9) provided with a curved surface (10) and that a single body (11, 20) of slip material is fixed on the curved surface (10, 13).

Bending machine for the production of rectangular sheet metal panels from flat metal sheets

Abstract: The bending machine for the production of rectangular sheet metal panels comprises a vertically traversing blank holder (3) which is formed of a plurality of blank-holding elements (10), two end elements (11) and two spacers (12), a fixed counterblade (16), two opposing blades (14, 15) fixed to a vertically traversing C support (27) and means for positioning the metal sheet to be bent on the counterblade (16). There are provided on the machine programming means (22) traversing along the blankholder (3) to vary the side extension of said blankholder according to the dimensions of the metal sheet to be bent. There is also provided the possibility of expanding and contracting the blankholder (3) sidewise at the beginning and at the end respectively of the bending operation of a long side of the metal sheet.

High-temperature sheet materials for gas turbine applications

Abstract: Aircraft gas turbines contain various sheet metal fabrications, such as combustion chambers, exhaust units, jet pipes, and reheat liners, which operate for long periods under arduous conditions. The properties required in a sheet alloy differ considerably from those of blades and vanes, so that alloys must be developed specifically for the purpose. The performance required of sheet alloys is discussed and current alloys are reviewed in terms of their fabrication, mechanical, and oxidation properties. Some recent developments are described in the field of thermal barrier coatings, dispersion strengthened alloys, and porous laminate materials.MST/524

Spiral heat exchanger and method of making it

Abstract: 1. Heat exchanger comprising a spiral body delimiting two spiral chambers A, B imbricated in each other and through which the two fluids, between which the heat exchange must take place, respectively pass, this body comprising two transverse end closure elements 11, the two spiral chambers A, B being defined by one and the same sheet metal 2 diametrically traversing each end side element 11, a first section 2a of the sheet metal 2, issuing from one end of the diameter of the side elements 11 being smooth whilst a second section of sheet metal issues from the opposite end, one of the spiral chambers A being defined between a turn of the second section of sheet metal 2b and the turn of the first section of sheet metal 2a located outside with respect to the preceding one, whilst the other spiral chamber B is defined by this turn of the second section of sheet metal 2b and the turn of the second section of sheet metal 2a located inside with respect to the preceding one, characterized in that the second section 2b of the sheet metal 2 bears bosses 2c, 2d ensuring mutual spacing apart of the first and second sections of sheet metal 2a, 2b once the latter are wound jointly spirally, the longitudinal marginal parts of the second section of sheet metal 2b bearing the bosses 2c, 2d are deformed so as to be adjacent the longitudinal marginal parts of the first section of sheet metal 2a, a U-section 6 open towards the outside is spirally wound between the pairs of longitudinal marginal parts of the first and second sections of sheet metal 2a, 2b so that the two end flanges of this section 6 are respectively adjacent two pairs of longitudinal marginal parts of the first and second sections of sheet metal 2a, 2b and this U-section 6 is welded by its flanges to these longitudinal marginal parts, so that the lateral closure of one of the spiral chambers B is ensured by the welded adjacent longitudinal edges of the first and second sections of sheet metal 2a, 2b and the lateral closure of the other spiral chamber A is ensured by the U-section 6 whose flanges are welded to the edges of the two sections of sheet metal 2a, 2b.

Apparatus for joining pieces of sheet metal

Abstract: An apparatus for joining two or more sheets by means of drawn and extruded material portions comprising a punch, a die and an anvil. The punch is driven to first cooperate with the die in a drawing step, then to transport the work piece to the anvil and to perform in cooperation with the latter an extrusion step. Preferably, a plurality of punches is driven to rotate and to cooperate with a die-and-anvil assembly common to all punches.

Method for forming a planar sheet or plate to a curved shape

Abstract: The present disclosure relates to an apparatus and a method for deforming sheet metal plates and more particularly aluminium and steel plates. The objectives of this disclosure are realized by laminating a plate of sheet metal in juxtaposed and parallel strips. This method allows for the formation of spherical surfaces having a variable curvature. These strips are oriented according to predetermined axes according to the expected result.

Method and arrangement for producing knockouts for electrical equipment cabinets

Abstract: METHOD AND ARRANGEMENT FOR PRODUCING KNOCKOUTS FOR ELECTRICAL EQUIPMENT CABINETS ABSTRACT OF THE DISCLOSURE A method of producing concentric knockouts on a planar portion of sheet metal to be formed into an equipment housing. The sheet metal is successively positioned with respect to punch sets of increasing diameter and knockout portions of increasing size are sequentially cut, but for retaining anchors, to surround previously cut portions. Successive knockout portions are cut by punches moving in opposing directions. The punch sets comprise a cutting punch and an embedding punch. The cutting punch cuts and displaces the knockout in a first direction and the embedding punch of the same punch set moves in an opposite direction to at least partially restore the cut and displaced portion within the surrounding portions of the sheet metal.

Method for manufacturing a tub for a laundry washing machine

Abstract: A method for manufacturing a tub of ferritic stainless steel for a laundry washing machine, comprising the steps of cutting a sheet metal blank, winding the blank and welding it to the form of a cylindrical body,, expansion-­forming of the cylindrical body and applying the end walls and accessory elements to the body. The welding step is carried out by means of a laser, and prior to the expansion-­forming step the cylindrical body is subjected to a heat treatment for eliminating the brittleness of the weld.

Method and apparatus for stripping metal sheet coated with molten material

Abstract: For stripping sheet metal coated in a galvanizing or vitreous-coating installation directly after the coated sheet has left a bath of molten coating material, both sides of the sheet are blasted with a thin curtain of gas. For this purpose a gas is used which is significantly heavier than air and is recirculated, the gas being for example sulfur hexafluoride or a mixture containing this gas.

New High Strength Large Diameter Pipe Steels

Abstract: Accelerated cooling after rolling represents a further development of the thermomechanical treatment designed to optimize alloying. In 1983, after extensive test series, a system for accelerated cooling—the Mannesmann Cooling System (MACOS)—was built at the Mulheim plate rolling mill. The design and control principles of this system are described, and the layout is schematized. The principle of using top and bottom water curtains ensures uniform cooling, even in the case of extreme plate widths. All system functions are controlled and monitored via a process computer. Using the production of a steel3-the GRS 550 (X 80), characterized by 0.08% C, 1.9% Mn, 0.04% Nb and 0.02% Ti—as an example, the reliability of this new combined method—TM MACOS—is verified.