127results about "Grooves" patented technology

Previously known mechanical deep rolling tools share the feature that their rollers not only roll over the work piece but also over a counter roller on the tool side. This allows the deep rolling roller to swing to the side; but the roller material becomes fatigued relatively quickly. To achieve longer life, a rolling tool is suggested in which a working periphery is located in a work piece contact area spatially separated from a bearing contact area of the roller. A rolling tool with a hydraulically supported forming roller and a roller suitable therefor are also suggested.

PCT No. PCT/US98/09524 Sec. 371 Date Jan. 15, 1999 Sec. 102(e) Date Jan. 15, 1999 PCT Filed May 13, 1998 PCT Pub. No. WO98/51432 PCT Pub. Date Nov. 19, 1998Deep rolling equipment for cold working fillet radii of annular undercuts on opposite sides of main bearing and crank pin journals of an engine crankshaft while being rotatably driven. The equipment has pairs of jaws movable between an open position for receiving the crankshaft journal and a closed position for rolling the fillets thereof. The upper jaw mounts fillet rolling tools for high load rolling engagement in the annular undercuts and a lower tool on the opposing lower jaw for support of the journal. The lower tool has a pair of support rollers with annular journal support portions which contact and support the journal while the fillet radii of the undercuts on either side of the journal are being rolled. These support rollers importantly have work stabilizing annular flanges outboard of the support portion with larger diameters that ride in the undercuts and limit lateral movement of the crankshaft with respect to the rolling and support tools so that the crankshaft is not abraded or otherwise damaged by side contact of the jaws and tools with portions of the crankshaft.

There is provided a new and improved apparatus and method for rolling workpieces such as crankshafts. The apparatus has first and second rolling heads mounted at spaced positions along a common rolling arm to receive a crankshaft bearing therebetween which can then be shifted relative to one another along the common rolling arm to close the heads or rolling tools for clamping onto the workpiece. The in-line clamping action and force provided by the tools on the rolling arm are created by actuation of a tall, thin cylinder assembly including a number of aligned individual cylinders sized to keep the width of the cylinder assembly to a minimum so that all of the rolling arms can likewise be of a thin construction pivotally mounted on one side of the crankshaft and axially spaced according to the crankshaft bearing spacing for rolling all of the bearings in a single rolling operation. A strain sensor can be utilized to generate clamping force readouts that are based on the amount of structural deflection of the arm detected by the sensor.

The invention relates to a process for finish-machining of bearing positions on main bearing journals and connecting rod bearing journals of crankshafts for motor car engines, whereby the crankshafts have roundings between the bearing positions and transitions adjacent in each case to the bearing positions. The roundings are deep rolled with a deep rolling tool and then, while maintaining a distance interval to an individual transition in each case the bearing position concerned is machined with removal of material with a small cutting depth.

The present invention pertains to a combined machining equipment for steel tubes, and a machining method is of a small size, can easily be moved, and is capable of not only flaring a steel tube, but also grinding a flared surface, forming a groove, and peeling off a lining. A main shaft (121) is rotatably mounted on a slide frame (141) slidable with respect to a common mount (103), and a second machining head (124) is mounted on a flange on the distal end of the main shaft (121). An auxiliary shaft (131) is slidably disposed in the main shaft (121) for rotation therewith. A first machining head (134) is mounted on a mount base (132) on the distal end of the auxiliary shaft (131). When the main shaft (121) is rotated and moved back and forth and the auxiliary shaft (131) is moved back and forth with respect to the main shaft (121), the first machining head (134) spreads the tip end of a steel tube (110) held by a steel tube holding apparatus (102) to a first position, and the second machining head (124) spreads the tip end of the steel tube (110) to a predetermined flanged position, thus flaring the tip end of the steel tube (110).

A method includes providing a shaft having a coupling section. The coupling section has a generally cylindrical exterior surface. The method includes applying a coating to the coupling section to form an engaging surface. The method further includes cold-forming the shaft and the coating such that a plurality of protrusions is formed in the engaging surface. The cold-forming of the shaft and the coating is performed contemporaneously.

An apparatus for forming microscopic recesses on a circumferential surface that defines a cylindrical bore in a workpiece, including a tool holder rotatably about a rotation axis, a form roller support moveable in a direction perpendicular to the rotation axis of the tool holder, a form roller rotatable about a rotation axis parallel to the rotation axis of the tool holder, and control means for controlling the form roller support such that the form roller is allowed to be in press contact with the circumferential surface of the cylindrical bore at a press contact load of a predetermined value on the basis of a centrifugal force which is exerted on the form roller support and the form roller during rotation of the tool holder.

The invention relates to a hard-rolling roller for a deep rolling tool having a torus-shaped base body for deep rolling of radiuses or recesses which limit the bearing trunnion on crankshafts on both sides, and two at least approximately truncated cone-shaped central bodies, rising on both sides of the body. A cylindrical body rises on the upper end surface of one of the two central bodies.

A method and apparatus to cold form rings or a lead battery terminal with undercuts or overhangs to improve the sealing properties of the rings. The apparatus can be one of a segmented die device and a die device wherein one die member moves relative to the other die member. In either apparatus at least one ring on the battery terminal is transferred from having a first shape into a second different shape with an overhang.

The present invention relates to the deep rolling apparatus (8) of a deep rolling machine 1 for crankshafts (3) in which two arms (9, 10) across from each other support a deep rolling head (13) or a support roller head (14). The support roller head (14) has two support rollers (21, 22) with parallel axes and the deep rolling head (13) has two work rollers (23, 24) entering the radii or fillets of the main bearing or crank pin journals or journals of the crankshafts (3). In one embodiment of the deep rolling apparatus (8) in scissor-like construction an axial guide roller (27) is provided on the deep rolling head (13) and is centered relative to the deep rolling head (13), its axis of rotation being perpendicular to the axis of rotation of the crankshaft (3). The axial guide roller (27) has a diameter that is slightly smaller than the distance between two oil collars (25, 26) of a main crank pin journal (5) of the crankshaft.

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 treat rods, bars and other particularly long billets. This method is designed to lower the cost of deformational treatment for long rods and large diameter billets and creates a pre-specified microstructure, including micro-crystal structure, and specific physical and mechanical properties. This may be achieved using various treatment techniques, one of which includes the deformation of at least a part of the billet through reduction of the billets cross-section. In this method, a long rod shaped billet is used. Reduction of the cross-section is achieved using tools that permit movement along and across the billet's axis as well as being rolled about its surface, for example, a roller. In this case at least one support stand is employed for correct placement of the billet. Additionally, a pre-specified strain level is achieved using at least one of the techniques of deformation: torsion, settling and extension using tools, for example the above-mentioned stand. The stand is designed to apply a specified scheme of deformation to the billet at the deformed (strained) section and at a specified temperature. This obtains specified structure with intrinsic physical and mechanical properties.

A tube having sealing ring grooves formed by a sequential rotational process and a shock absorber including the tube, in which durability of a sealing ring fitted in each of the sealing ring grooves is enhanced. An inclination angle (θ1) formed with respect to a plane (PL1) perpendicular to an axis of a separator tube by a side surface of the sealing ring groove, which is located on an opening end side of the separator tube, is set to 8° or more. With this, a maximum tensile stress to be applied to an O-ring can be reduced to be smaller than a maximum tensile stress in a case of using a backup ring. As a result, the durability of the O-ring can be set equivalent to or enhanced to be higher than durability in the case of using the backup ring.

A cold forming process for manufacturing ball pivots with a ball area, a cone area and a thread area for installation in ball and socket joints by cold forming is presented, in which a ball pivot blank (1) with a shaped cone area (3) and cylindrical areas for the thread (2) and the ball (5) is manufactured at first from a bar-shaped semifinished bar stock by extrusion. The extrusion operation is followed by the forming of the ball area as another manufacturing step by means of a rolling processes. At the same time, the thread area can be formed in its final shape. Thus, the ball pivot is manufactured as a whole by cold forming only and it makes it possible to significantly increase the production output per unit of time compared to the processes known from the state of the art. At the same time, it is possible to use less expensive grades of steel, because sufficient fatigue strength of the ball pivot can be guaranteed by the cold forming.

A machining tool for manufacturing a radial bearing, and a manufacturing apparatus and a manufacturing method using the machining tool are provided. The machining tool includes an inner surface finishing tool to finish an inner circumference surface of a bearing hole provided on a radial bearing. The inner surface finishing tool includes a tool shaft main body member that defines a hollow storage section provided within the tool shaft main body member, a rotatable core piece member mounted inside the hollow storage section in a manner to be rotatable within the tool shaft main body member, and a plurality of roll machining members each with a circular cross-sectional roll machining surface. The plurality of roll machining members rollably abut against the outer circumference surface of the rotatable core piece member. The plurality of roll machining members are in contact under pressure with the inner circumference surface of the bearing hole. The rotatable core piece member is movable in the radial direction and can be tilted with respect to the central axis of the tool shaft main body member.

The inventive method of forming anchors comprises following steps. A rod-shaped workpiece is roll-formed by penetrating the rod-shaped workpiece with two wedge-shaped tools at two points. The two points are arranged on opposite sides and axially separated of a plane perpendicular to an axis of the rod-shaped workpiece. The two wedge-shaped tools are axially approaching to the plane while the rod-shaped workpiece is revolved around the axis. The roll-formed workpiece is separated along the plane for forming two bolts. A sleeve is applied around the anchor bolts.

The invention discloses a machining process of an NPR steel bar wire rod. An NPR steel bar is in a cold machining state, the diameter of the NPR steel bar is smaller than 14 mm, the yield strength ofthe NPR steel bar is 800 MPa to 950 MPa, the tensile strength is 900 MPa to 1100 MPa, and the maximum force elongation rate is larger than or equal to 20%. The machining process comprises the following steps of a linear emptying process L20; an uncoiling process L30; a leveling process L40; a pointing process L50; a butt welding process L60; a hydraulic head pushing process L70; a cold drawing smooth surface process L80; a sand blasting process L90; an in-situ online annealing process L10; an air cooling buffer process L11; a coiling process L12; an emptying process L13; a leveling process L14; a cold drawing spiral process L15; a straightening process L16; and a coiling process L17. According to the machining process of the NPR steel bar wire rod, the whole-process intellectualization canbe achieved, the machining requirement of the NPR steel bar wire rod is met, and the full-automatic intellectualized production requirement of the NPR steel bars, the NPR cold-rolled spiral steel bars and the NPR prestressed steel bars is met.

A rolling tool for the roller finishing of bearing surfaces of a crankshaft is pivotable around a crankshaft axis, with a finishing roller head and with a support roller head. In order to prevent damage to the guide mechanisms, the roller finishing roller is guided on all sides in a roller cage and the finishing roller head has a frame wherein it is mounted pivotably around a first pivot axis which is perpendicular to the crankshaft axis and parallel to a tangent on a working side of the roller finishing roller. Additionally or alternatively, the support roller head comprises a support roller frame in which the support roller housing is mounted pivotably around a second pivot axis perpendicular to the crankshaft axis and parallel to the first pivot axis, and around a third pivot axis perpendicular to the crankshaft axis and perpendicular to the first pivot axis.