Matches 1 - 50 out of 114 1 2 3 >


Match Document Document Title
8091616 Enhanced heat transfer tube and manufacture method thereof  
A heat transfer tube can comprise a tube body, and outer fins integrated with the tube body which are formed by allowing material on the tube body to extend along radial direction of the tube body...
8006528 Method for producing duplex stainless steel pipe, method for straightening, method for regulating strength, and method for operating straightener  
In straightening a duplex stainless steel pipe on a multi-roll pipe straightener, the value of A defined by the formula (1) is set to not more than 2.0% when it is not necessary to improve the...
7866378 Double-wall pipe, method of manufacturing the same and refrigerant cycle device provided with the same  
A double-wall pipe includes an outer pipe, and an inner pipe disposed inside the outer pipe. An outer wall of the inner pipe has thereon a ridge portion, which defines a groove portion extending in...
7654122 Process for straightening a tube  
In straightening a tube using a roll straightening machine provided with drum type straightening roll pairs vertically opposingly disposed, at least an outer layer portion of a roll main body is...
7418848 High-performance and high-efficiency rolled fin tube and forming disk therefor  
Disclosed herein is a forming disk for fabricating a fin tube. The forming disk comprises a substantially circular plate having a shaft connection hole formed adjacent a center thereof for...
7197808 Process for forming a groove in a friction layer  
Device for forming of at least one groove (92, 93, 94, 95, 96, 97, 98) in a friction layer (91) of a covered disk (90) for a force transmission aggregate, in particular for a disk clutch, with a...
7194805 Method of manufacturing a post ball bearing with helical arrangement of pocket holes  
A post bearing and method of manufacture in which bearing balls are loaded into a series of pocket holes arranged along a helical pattern in a sleeve cage. A single groove is swaged into the...
7065996 Rolling die for ball screw  
A rolling die for a ball screw has: a cylindrical portion including a helical protrusion formed in an outer peripheral surface thereof for forming a helical ball groove in a raw material of a screw...
6968719 Apparatus and methods for forming internally and externally textured tubing  
A machine may produce a tube having textured internal and external surfaces in a single operation. Inner and outer knurling tools may form the textured surfaces. The texturing of the internal and...
6920773 Method and apparatus for manufacturing tubes by rolling  
A method for manufacturing a tube made of a non-ferrous material, particularly a tube made of mainly copper, by rolling, in which method, in the first working step the tube billet is worked by...
6904779 Method of manufacturing a heat exchanger tube with parallel fins  
A method of forming a finned tube in which the fins are planar, paralleled and extend radially to the tube longitudinal axis, including the steps of positioning at least one rotating forming roll...
6892559 Method and apparatus for manufacturing tubes  
A method for manufacturing a tube made of a non-ferrous material, particularly a tube made of mainly copper, in which method, in the first working step the tube billet is worked so that mainly...
6883358 Method of producing sliding sleeves for gearshift mechanisms  
A method of producing a sliding sleeve for gearshift mechanisms includes two forming steps. In the first forming step a preform, which has been pushed onto a tool mandrel with an external toothing,...
6880421 Rolled ball screw and method for rolling ball screw groove  
A rolled ball screw has a screw shaft having a ball screw groove so as to engaging with rolling elements of a ball screw, the screw shaft is formed by rolling while a thread rolling die is pressed...
6786072 Method of fabricating a heat exchanger tube  
A metallic heat transfer tube, in particular for the evaporation of liquids from pure substances or mixtures on the outside of the tube. Fins are integrally formed on the outside of the tube....
6718809 Method for processing billets out of metals and alloys and the article  
This method refers to a method by which the physical and mechanical properties intrinsic to a fine-grain structure may be formed in metal billets using pressure treatment. The method is designed to...
6708544 Thread rolling die and process for the production thereof  
In a rolling die for forming a ball screw by rolling for example, a biting portion is formed on one end of a straight portion while a relief portion is formed on the other end. Further, the helical...
6334349 Method for the manufacturing of a shaft with a larger diameter flange  
The invention relates to a method for the manufacture of a shaft with a larger diameter flange, particularly for a cone gear, a round stock as the workpiece being rotated about its longitudinal...
6067832 Process for the production of an evaporator tube  
A process for producing a heat exchanger tube (1) with a highly porous surface structure, in particular for evaporating liquids from pure substances or mixtures on the outside of the tube. The...
5916318 Machine for simultaneously forming threads or fins on multiple cylindrical workpieces  
A machine for simultaneously forming helical threads or fins on the exterior of first, second and third elongated cylindrical workpieces, the machine having first, second and third arbor blocks...
5803164 Multiple finned tube and a method for its manufacture  
A metallic finned tube having multiple fins integrally formed on and extending helically on an outside of the tube. The fins number at least four and begin at fin run start locations spaced evenly...
5659955 Method of making powder metal helical gears  
A method includes the steps of compacting powder metal to form a powder metal blank, and forming gear teeth on the powder metal blank by rolling the powder metal blank between rolling dies rotating...
5642638 Process for the rolling of hallow ingots on a assel rolling mill  
The invention relates to a process for reducing the outside diameter and wall thickness by rolling a cylindrical hollow ingot the front part of which is fed into an Assel rolling mill, in which...
5617752 Methods of and apparatus for straightening rods  
A rod-straightening apparatus 28 includes a movable collet unit 30 for gripping a butt end 24 of a rod 20 to be straightened. The rod 20 extends from the collet unit 30 in a cantilevered fashion to...
5365763 Device for shaping of helical fins on the outer wall of a tube  
A device for the formation by rolling of helical fins on heat exchange tubes to increase the heat transfer capacity of the tubes. The device comprises four forming rolls (6, 7, 8, 9) which are...
5003690 Finning and thread rolling machine  
A finning and thread rolling machine capable of producing an integral finned tube, an extended finned tube or a wrap-on finned tube, whichever is desired, the tubing to be used for extended surface...
4915166 Titanium heat exchange tubes  
Improved method and apparatus for making finned tubing from difficult to work materials such as titanium and stainless steel uses spaced sets of finning discs on a plurality of arbors to form a...
4901553 Method of manufacturing a finned tube  
A method of manufacturing a metallic tube with a spiral fin for use as a heat transfer tube of a heat exchanger and the like. A solid metallic bar or metallic elementary hollow bar provided with a...
4866830 Method of making a high performance, uniform fin heat transfer tube  
A high performance heat transfer tube for use in the condenser of an air conditioning or refrigeration system is formed on a grooved mandrel which has a sufficient number of grooves i.e., thirty...
4825674 Metallic tubular structure having improved collapse strength and method of producing the same  
Disclosed is a metallic tubular structure having an improved collapse strength characterized in that the tubular structure has a circumferential residual tensile stress left in the inner peripheral...
4765058 Apparatus for manufacturing enhanced heat transfer surface  
An apparatus for producing a high performance evaporator tube having a subsurface channel formed between adjacent helical fins with the subsurface channels having alternating closed portions and...
4763504 Straightening machines and methods  
A cross-roll straightener adapted to straighten round metal stock, wire, rods, bars and tubes by rotatingly advancing the stock through a central curved pass such that it is flexed beyond the yield...
4692978 Method for making heat exchange tubes  
Improved method and apparatus for making finned tubing from difficult to work materials such as titanium and stainless steel uses spaced sets of finning discs on a plurality of arbors to form a...
4640115 Straightening device  
In order to increase output of pipe straightening devices, there is provided a driving unit between a preparatory station for the pipes and a feeding station which advances the pipes from the...
4616391 Apparatus for making heat exchange tubes  
Improved method and apparatus for making finned tubing from difficult to work materials such as titanium and stainless steel uses spaced sets of finning discs on a plurality of arbors to form a...
4612790 Method of drawing ribs on tubes  
A method of forming ribs on tubes or pipes is characterized by applying to the material of the tube, from which the rib is formed, initial compressive stresses preferably ##EQU1## where Fo denotes...
4612791 Method and apparatus for rolling transversely ribbed bimetallic pipes  
A method and apparatus for rolling transversely ribbed pipe consists in that the rib after forming is deflected in the direction of rolling parabolically, the external pipe is pressed down to the...
4606102 Process for repairing labyrinth seal flanges  
The invention relates to a process and an apparatus for repairing worn labyrinth seal flanges. The seal flanges are repaired by spin-forming them to increase their radial height to at least equal...
4577381 Boiling heat transfer pipes  
A method for producing a boiling heat transfer pipe having in the circumferential wall thereof one or a number of helical or annular cavities under a ceiling wall containing a row of openings...
4571972 Skewed-axis cylindrical die rolling  
Skewed-axis cylindrical-die rolling method for the production of combined screw-thread and gear-tooth forms on the external surface of bars using multi-element dies which progressively form the...
4565083 Straightening rolls  
A roll configuration for use in a roll type straightener including a concave surface of revolution formed on a roll for line contact of the roll with a cylindrical workpiece wherein the throat of...
4534197 Method and apparatus for straightening pipe  
An apparatus for straightening pipe, round bars or similar elements, wherein the pipe moves between rolls which subjects the pipe to tensile and compressive stresses and forces as it rotates in the...
4512173 Tube release rolling mills  
The invention concerns a tube release roll mill with four or more driven rolls, which in pairs form a pass opening. The diagonally positioned identically constructed rolls have an enlarged working...
4491002 Method for forming on workpiece resilient thread having closed helical cavity inside the thread  
A method of forming on a workpiece a resilient thread, having a closed helical cavity inside the thread, includes plastic deformation of the walls of a preformed helical groove whose depth exceeds...
4489582 Method for straightening drawn round stock and apparatus for the practice of the method  
The invention relates to a method and an apparatus for the straightening of drawn round stock. In conventional straightening methods, the round stock to be straightened is transported through the...
4426868 Apparatus and method for forming fins on a tube surface  
Apparatus and method for forming fins on a tube surface. The apparatus comprises a plurality of roller assemblies and each roller assembly includes first and second spaced apart sets of discs. The...
4425696 Method of manufacturing a high performance heat transfer tube  
A method of making a new high performance heat transfer tube for use in an evaporator of a refrigeration system is disclosed. According to this novel method, a grooved mandrel is placed inside an...
4406141 Straightening apparatus for steel pipes and the like  
An apparatus for straightening the bend in steel pipes, round bars and the like (hereinafter simply referred to as steel pipes). The apparatus includes a first straightener comprising a combination...
4406142 Annular corrugator  
Apparatus for producing annular corrugations in the wall of thin metal tubing in the manufacture of corrugated metal hose includes a plurality of dies. Each die comprises a helical rib of greater...
4392369 Diagonal rolling of hollow stock  
Diagonal rolls for stretching hollows are of a truncated-cone-like configuration, each with two shoulders and a recess in between, for cooperation with a cylindrical mandrel rod in order to obtain...
Matches 1 - 50 out of 114 1 2 3 >