Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7421875 | Cold-headed standoff A process for cold forging a metal fastener such as a self-clinching standoff includes a punch and die set at the final head trimming station which produces the shear burr only on the underside of the fastener head where it is not visible after installation. A knock... | 09/09/2008 |
| 7347076 | Forging method and apparatus for forming helical gear Disclosed herein are a helical gear forging apparatus wherein a forming introduction portion thereof, used to form gear teeth of the helical gear, is variable in shape on the basis of the desired helix angle of the gear-teeth so as to constantly keep a predetermined... | 03/25/2008 |
| 7320240 | Oil grooves formed in a race A device, such as an inner race of a torque converter's overrunning clutch, is formed by powder metallurgy. The race includes oil grooves and chamfers formed in each face by forging. The oil grooves on the first face open onto the chamfer. The chamfer on the second ... | 01/22/2008 |
| 7231799 | Method and device for the production of a workpiece with internal toothing, in particular a hollow wheel The invention relates to a method and an apparatus for producing a workpiece with internal toothing, especially an internal geared wheel, by using a cup shaped preform (N) with a substantially cylindrical side wall (N1) and a mandrel (5) with an extern... | 06/19/2007 |
| 7047787 | Method of forming spline and keyway for sheet metal rotating member with boss part An annular excess portion is disposed, a spline forming male mold is passed through a boss of a sheet metal-made rotary member in which a root portion of the boss and a peripheral portion are previously displaced, and the boss is set to a stationary mold with being ... | 05/23/2006 |
| 6842982 | Method of producing bushing By press-fitting a cylindrical blank into a die with one of a pair of punches, and at the same time press-fitting small diameter end portions and tapered portions of the pair of punches into both ends of the cylindrical blank while restraining both end surfaces of t... | 01/18/2005 |
| 6470728 | Cold forging method and apparatus A stock inserted into a die is sandwiched between a punch and a knock-out, a predetermined pressing force is applied to the knock-out, and a pressing force larger than the sum of the pressing force of the knock-out and a pressing force for forming is appl... | 10/29/2002 |
| 6250128 | Forging die and upset forging method An upset forging die device and method are provided for upset-forging a raw material that is being filled in a cavity of a lower molding die at a portion between an upper punch of an upper molding die provided on a slide and a lower punch of the lower mol... | 06/26/2001 |
| 5906047 | Manufacture of grease fittings and blanks therefor A grease fitting is made by forming its outer shell in a series of cold forging steps to make a blank with the necessary thread blank at one end, a hexagonal center portion, and with a grease-fitting-mating nipple outline at the other end. Threads are rol... | 05/25/1999 |
| 5894752 | Method and system for warm or hot high-velocity die forging An axially symmetric ring work piece is formed by a warm or hot, forward and backward extruding, die forging system. In this system, a die having a rearwardly projecting portion, which projects in the opposite direction to a pressing direction, a heated w... | 04/20/1999 |
| 5746085 | Gear forming method A method of forming a gear through cold plastic working comprises preparing a disc-like blank, and pressing conically a central portion of the blank with a uniform pressure from upper and lower sides to cause plastic deformation in the blank thereby to fo... | 05/05/1998 |
| 5507167 | Process and device for providing a shaft with splines A forming process for providing a shaft with splines in that the shaft is provided with splines in such a way that the complete tooth depth is ensured over the entire length to be provided with teeth and any distortions which may occur are minimized in th... | 04/16/1996 |
| 5492001 | Method and apparatus for working burred portion of workpiece The periphery of a workpiece which has already been subjected to burring is at least partially punched by a periphery punch and a periphery die. The burred portion is then further pressed by the periphery punch and a die surface including an annular porti... | 02/20/1996 |
| 5195349 | Forming machine and process for forming material therewith This invention relates to a forming machine used for full enclosed die forming etc. The forming machine of this invention consists of inserting a punch into at least one of a pair of dies disposed to face each other, supporting the die having the punch in... | 03/23/1993 |
| 5119663 | Method and apparatus for cold extruding universal seal crosspieces A spider or cross for a universal joint is manufactured by first forging the basic configuration of the cross and thereafter extruding the trunnions into their final configuration. The component is initially hot or warm forged into its basic configuration... | 06/09/1992 |
| 5005755 | Flexible tube of endoscope and method of and apparatus for producing the same An elongated flexible tube that constitutes an insert part of an endoscope. The flexible tube comprises: a spiral tube made of a precipitation hardening metal and having a groove which is recessed inwardly from the outer surface of the tube, the groove ex... | 04/09/1991 |
| 4914938 | Fully enclosed die forging apparatus According to the present invention, there is provided a full enclosed die forging apparatus having an upside die and an underside die disposed opposedly in a vertical direction between a slide and a bolster. There is an upside cylinder mechanism contained... | 04/10/1990 |
| 4897912 | Method and apparatus for forming joints A method and apparatus for forming pierce type or pierceless clinch joints in two sheets of material, such as sheet metal, employs a drive system which eliminates the need for camming mechanisms and periodic adjustment of worn cams. A die and anvil are re... | 02/06/1990 |
| 4796459 | Accumulator system for closed die forging An accumulator system for establishing a clamping force on dies in a closed die forging device. The accumulator system includes an accumulator having a differential piston and a free piston. The small end of the differential piston forms a wall of the acc... | 01/10/1989 |
| 4696086 | Die set apparatus for badges A die set for assembling badges and buttons includes a punch and two dies. The badge shell and artwork are loaded onto the first die. The punch descends during a loading stroke to load the shell and artwork therein by friction. The second die is positione... | 09/29/1987 |
| 4682487 | Method for reconditioning spot welding electrodes A method and an apparatus for reconditioning worn electrodes for resistance welding. The worn electrodes are pressed into a die by a punch and thus restored to their original shape or given a different shape.... | 07/28/1987 |
| 4604495 | Semiconductor device and process for producing same A ceramic-type semiconductor package including a semiconductor pellet, a ceramic lead base having a cavity for accommodating the pellet, and a metal cap for sealing the cavity. The cavity is upward opened, and the metal cap has a central depressed portion... | 08/05/1986 |
| 4448055 | Method to manufacture pole pieces for dynamo electric machine, and so-made pole piece A blank 1 is removed from a strip of material 2 and placed in a die against which a lower punch and an upper punch are operable. In one step, by moving of the lower punch upwardly, shaped to form the pole core or pole piece, and the upper punch against th... | 05/15/1984 |
| 4434640 | Process for the production of a bearing bushing without machining A method for making a bearing bushing for the support of the trunnion in universal joints comprising a cylindrical sleeve section, a bottom section at one axial end of the cylindrical sleeve section, the peripheral edge joining the sleeve section and bott... | 03/06/1984 |
| 4423617 | Method of making a male resistance welding electrode A method of making a male resistance welding electrode includes a forward extrusion step in which the shank portion of the electrode is partially formed by extruding a cut-off billet of dispersion strengthened copper over a pin in a first die. Subsequentl... | 01/03/1984 |
| 4420283 | Method of forming an outwardly inverted peripheral edge on a preformed metal lid The invention relates to a method whereby a preformed metal lid which is intended for a tin, e.g. a paint tin, and of which at least one peripheral portion is axially deepened, is formed with a radially outwardly inverted peripheral edge with respect to t... | 12/13/1983 |
| 4400965 | Forming integral flanges in a sheet apparatus therefore The method and apparatus for forming flanged holes and a resulting plate and tube assembly of the type used in fluid-to-fluid, such as gas-to-gas, liquid-to-liquid and liquid-to-gas, heat exchangers. A depression is formed with the aid of a punch in a pla... | 08/30/1983 |
| 4352283 | Method of forming spark plug bodies A method of manufacturing a hollow spark plug body having a cylindrical central portion (28), a first end portion (10) of smaller circular radial cross-section and a second end portion of non-circular radial cross-section, e.g. hexagonal, and of smaller m... | 10/05/1982 |
