Abstract: An apparatus is provided for producing metallic heat exchanger tubes having a heat exchange surface that is increased by fins. A rotating tube has helically wound on its outer surface a strip that forms the fins, with this strip being fed to the tube surface under tension, and with the bottom edge of the strip being welded to the tube. The contact surface that exists between the tube and the bottom edge of the strip, and that extends helically on the surface of the tube, is fused exclusively at the surface of the tube with a laser beam that is directed in the region where the strip runs onto the surface of the tube, and that fuses a portion of the tube surface that in the axial direction of the tube corresponds at least to the width of the bottom edge of the strip and in the circumferential direction corresponds approximately to the same amount. At the same time, the laser beam fuses the bottom edge of the incoming strip in the region where the strip runs onto the surface of the tube.

Abstract: A method of producing a metal support for an exhaust gas catalyst. The method comprises the steps of: (a) mating respective end portions of flat and corrugated metal strips in such a manner that respective major portions of the strips extend in opposite directions; (b) putting the mated end portions of the strips between two generally flat holding members; (c) winding the major portions of the flat and corrugated metal strips around the holding members overlapping one on another by a predetermined number of times, thereby to produce an oval structure which includes the flat and corrugated metal strips and the holding members; (d) drawing the holding members from the oval structure thereby to provide a semi-processed oval assembly which has two generally flat bores left therein; and (e) pressing the semi-processed oval assembly in a manner to eliminate the bores thereby to provide a tightly wound oval assembly of the flat and corrugated metal strips.

Abstract: A method for assembling a cam follower in a rocker arm of a valve drive mechanism comprises the steps of forming through the walls of the rocker arm a first through-hole which has an inner diameter slightly larger than the outer diameter of the cam follower shaft and a second through-hole which has an inner diameter slightly smaller than the outer diameter of the cam follower shaft, and inserting the shaft into the first through-hole and temporarily holding a tip end of the shaft with the second through-hole before permanently securing the shaft to the walls of the rocker arm by caulking.

Abstract: A cast cylinder for an internal combustion engine having an intake valve cavity located on one side of the piston bore, an intake bore for communication with a carburetor located on the other side of the piston bore, and an internal passageway cast therein communicating the intake bore and the intake valve cavity. The internal passageway is curved and circumscribes a portion of the intake bore. A walled hollow tube having initially closed ends is embedded in the cast cylinder during casting as a permanently retained casting core. Subsequently the ends of the embedded tube are machined open to communicate with the intake valve cavity and the intake bore, respectively, to define the internal passageway.

Abstract: A descaling abrading apparatus with abrading rolls comprises an apparatus frame, a bearing member, and a plurality of parallel abrading rolls supported horizontally by the bearing member. Each abrading roll includes a rotating shaft, disk-shaped abrading wheels successively mounted on the rotating shaft via their corresponding collars, and spring supporters each concurrently serving as a key and disposed between their corresponding abrading wheel and their corresponding rotating shaft. The abrading wheels of one abrading roll are each located facing the collar between two corresponding adjacent abrading wheels of another adjacent abrading roll. The bearing member is supported by the apparatus frame so that it may be vertically movable with respect to the apparatus frame and so that it may be vertically downwardly pressurizable by a pressurizing means.

Abstract: A roll for a mill includes a roll shaft of a circular cross-section having an axis of rotation therethrough and having an outer peripheral surface. A ring of a wear-resistant material having an outer peripheral surface adapted to engage with a metal material to be rolled is disposed around the roll shaft. A tubular sleeve having an inner peripheral surface is disposed between the roll shaft and the ring with the inner peripheral surface mated with the outer peripheral surface of the roll shaft. A layer of adhesive is interposed between the ring and the sleeve for adhesively securing the ring and the sleeve together. The adhesive layer is compressed by the ring and the sleeve so as to be brought into frictional engagement therewith.

Abstract: Venetian blind ladder means are provided in which first and second cross elements (4,5) of each cross connections of the ladder are located whereby the height of the projection of every pair of elements on a plane through the longitudinal side member axes ranges between zero and slightly larger than the depth of the blind slat material and the distance between the side members (3a,3b) of the ladder is only slightly greater than the slat width. During assembly, the ladder means are guided so that, at the location of interlacing, each consecutive interlacing opening is angled to extend in a plane perpendicular to the plane of slat feed or at an angle so that the projection of the mutual spacing between elements (4,5) in this perpendicular plant is sufficiently large to allow the advancing slat to be easily and rapidly fed therethrough.

Abstract: The apparatus comprises a work surface heated by a heat carrier medium and located upon a heat-conducting layer carried by a metallic base body. The base body is provided with grooves at its surface confronting the heat-conducting layer and/or this heat-conducting layer is provided at its surface confronting the base body with grooves. The work surface is heated by infeeding the heat carrier medium into the grooves. To influence heat transfer to the heat-conducting layer carrying the work surface, particularly to a sheet metal plating or the like, for instance a cylinder jacket seated in direct metallic contact or only through the intermediate disposition of a transition layer of good thermal conductivity, upon the base body, there are provided control means regulating heat conduction from the base body to the heat-conducting layer and/or from the heat carrier medium guided in the grooves to the base body or the heat-conducting layer.

Abstract: A mounting assembly for supporting stator vane platforms formed in an extended arc length, such as 90.degree., in a compressor casing, comprising a circumferential flange formed in the compressor casing having spaced clamp arms, a flange carried on each stator vane platform having a surface which is formed with a plurality of radially outwardly extending wedge lock elements, and locking springs having inner and outer sides each formed with wedge lock elements extending radially outwardly therefrom. In order to mount the stator vane platform on the compressor casing, the locking springs are placed in an "unlocked" position on the flange of a stator vane platform wherein the wedge lock elements on the inner side of the locking spring extend between adjacent wedge lock elements on the flange. The vane platform flange and locking spring are then inserted as a unit between the clamp arms of the compressor casing.

Abstract: A method of securing in fluid tight relation the spaced ends of straight legs of heat exchange tubes of a U-shaped matrix to a tubular fluid conveying duct is effected by bending the spaced ends of the straight legs of the matrix to reduce the spacing between the ends of the tubes, thereafter loosely gathering the ends of the tubes to bring them into contact along their surfaces and then encircling the loosely gathered tube ends with frame elements which apply compression forces to the tube ends to deform then and cause them to come into contact with one another over substantially the entire surface areas thereof. The tube ends are then heated to braze them together and unite them with the frame elements as a unified block assembly. The block assembly is then inserted into an opening of conforming shape in the tubular fluid conveying duct and joined to the duct in sealed relation.

Abstract: A method of and apparatus for repairing turbine blades wherein the repair requires the input of considerable thermal energy during a welding or brazing operation for example. The method involves the step of pre-distorting the blade prior to the welding or brazing operation so that the distortion that is expected to occur during welding or brazing leaves the blade after repair in its proper position. A clamp means may be provided to prevent parts of an individual blade from being predistorted so as to localize the predistortion in the required area. A tool for predistorting the blade ensures that a physical force may be applied to a local area of the blade.

Abstract: A synthetic press roll for use in paper machines includes a cylindrical mantle to which a surface layer is applied, the surface layer comprising a mixture of a first powder of metallic material and a second powder of an inorganic material. The metallic material of the first powder includes copper, bronze, stainless steel, nickel, chromium and/or a titanium alloy. The inorganic material of the second powder comprises quartz, feldspar, Al.sub.2 O.sub.3, ZrO.sub.2, TiO.sub.2, TiC, SiC, MgO, Si.sub.3 N.sub.4, Cr.sub.2 O.sub.3, WC, NbC, VC, Cr.sub.7 C.sub.3, or other corresponding ceramic material, or mixtures of the same. The surface layer may be produced by thermal spraying, casting, by winding a sintered or rolled band of the mixture around the mantle, or by forming a flexible mat pre-coating in which the desired mixture is bound by a binder, such as PTFE, and by fixing the precoating to the roll mantle by melting it by means of induction or laser heating.

Abstract: A fuel injection valve and a method for adjusting its fuel quantity are proposed. The fuel injection valve is used to inject fuel into the intake system of a mixture-compressing internal combustion engine having externally supplied ignition. It has a valve needle, which when a magnetic coil is excited is attracted toward a core by an armature connected to the valve needle, whereupon the valve needle with a sealing seat formed on it, lifts away from a valve seat face embodied on a nozzle body. According to the invention, the nozzle body is closed off by a bottom embodied in the form of a small plate, which is part of the nozzle body and in which a plurality of calibrated injection ports are located. The closure of the valve needle is embodied by a tang, which extends as far as the immediate vicinity of the bottom. The injection ports are produced by erosion thereof, while their calibration for the sake of static fuel quantity adaptation is performed by hydraulic grinding with a flowable grinding medium.

Abstract: A corrosion resistant condensing heat exchanger is formed from a flat sheet of engineering metal with a layer of polypropylene sheet material laminated thereto. Each condensing heat exchanger has a condensing flow passage of serpentine shape formed in the laminated flat sheet of engineering metal such that the polypropylene layer will be exposed to the flue gas/condensate environment to provide corrosion resistance to the metal.

Abstract: A process for producing brazeable pipes particularly for use in heat exchangers, the process comprising preparing a brazing sheet which comprises a core sheet coated with a brazing substance at least on one surface, forming a bulged portion of a semi-circular cross-section in the central section of the brazing sheet, providing apertures in the bulged portion for securing tube ends therein, and rolling the brazing sheet into a cylinder with its opposite ends being butt jointed to each other.

Abstract: The monitoring device is constructed in such a way that the temperature measurement takes place directly at the bearing and there is no need for detaching connecting lines during changing of rolls. The main features of the monitoring device for roll bearings, installed, for example, in the chock (1) of the work roll (3) of a roll stand, reside in a thermal limit value pickup (6) in contact with the roll bearing (7), as well as in a mechanical, spring-loaded transmission member (8) locked in place in the chock (1) by way of the limit value pickup, for acting on a signal generator (9) arranged outside of the chock (1) in the roll stand, this signal generator being actuated to shut down the rolling mill by automatic outward movement of the transmission member (8) after releasing its locking device by the limit value pickup (6) upon reaching a limit temperature of the roll bearing (7). The monitoring device is preferably intended for use in thin-gage strip and foil rolling mills having high rolling speeds.

Abstract: In an apparatus for the introduction of a repair sleeve into a tube of a steam generator, difficulties are encountered if the axes of the repair sleeve and the steam generator tube are not aligned. Furthermore, problems are encountered in positioning the repair sleeve exactly in its end position. In order to achieve a precise centering and positioning of the repair sleeve, an aperture is formed by a connecting sleeve which is resiliently supported in the axial direction. The repair sleeve is clamped between a first shoulder of a holding grip and a centering piece which has a variable outside diameter. In such a structure, the greatest diameter of the shoulder surface is less than the inside diameter of the connecting sleeve. The holding grip is associated with a second shoulder having an axial distance from the first shoulder which is further away from the tube sheet than the first shoulder by the height of the connecting sleeve.

Abstract: A method for the manufacture of piston rings from a metal strip, at least includes providing rings having a predetermined non-circular profile, by the metal strip being first bent to a uniform radius of curvature at least 2 percent less than the minimum radius of curvature in the predetermined profile, then the curved strip being bent back to increase the radii of curvature of all the constituent portions of the strip forming the ring to the desired values of the predetermined profile.

Abstract: The magnitude of forces which act upon the rolls in rolling mills can be ascertained by directly monitoring the extent of deformation of the rolls under the action of forces which are applied to the rolls in actual use of the rolling mill. The monitoring step includes measuring the extent of deformation of each roll at a plurality of different locations. The rolls are preferably made, at least in part of a high quality alloy known as X5 NiCrTi 25 15 which renders it possible to dispense with surface cooling of the rolls. The monitoring involves a determination of rolling force FN, of the horizontal component FH of rolling force, of the vertical component FS of rolling force, and of the angle gamma between the direction of action of the rolling force and the vertical.

Abstract: A roll device with roll rings clamped axially between a shaft collar and an adjustable ring stop. The ring stop comprises a ring which is fixed to the shaft and which can be designed, for example, as a threaded nut, and an adjusting support ring. The ring fixed to the shaft and the adjusting ring interact via sawtooth-shaped end faces.