摘要:
A tube forming machine for making a tube from a sheet is disclosed. The forming rolls of this invention include various V-shaped rolls at least some of which are used as part of a three-point bending technique. The three-point bending technique entails the use of a V-shaped bottom roll and a narrow top roll. The sheet is shaped running the sheet through a gap between the narrow top roll and the V-shaped bottom roll. The technique allows a wide variety of tubing to be made from the same set of forming rolls, because the curvature obtained in a sheet can be varied by opening or closing the gap. A V-shaped forming roll disclosed herein is also used at a pinch roll stand with a second complementary V-shaped roll. The pinch roll stand of this invention creates an initial V-shaped sheet which facilitates the threading of the sheet at the start of a forming operation. Brimmed rolls are also disclosed. Brimmed rolls have a relatively sharp included angle, and are used to engage the edges of a sheet and to press the sheet against a single bottom roll in brimmed roll stand.
摘要:
A clamp mechanism in a travelling cutting machine for a steel pipe, in which a clamp open-close wedge provided with a biasing spring is mechanically operated using a cam system in association with vertical movement of a lifting base plate, thereby minimizing a time lag between the operation times, and in which a lower front blade, an upper blade passing-gap adjusting member and a lower rear blade are made into an integral component, thereby easing exchange of the blades.
摘要:
An apparatus for cutting tubing to predetermined lengths while the tubing is being produced. The apparatus includes a cutting or shearing assembly comprising a die-set which having a cutting blade. The die-set is translated to a velocity which matches the line velocity of the tubing as it is produced. A press assembly acutates the cutting blade. The apparatus has a controller which calculates the maximum cutting time available, and the press assembly is instructed to rotate at the slowest rate possible, depending upon the line velocity. By causing the cutting blade to move as slowly as possible through the tubing, the life of the cutting blade is prolonged.
摘要:
A cylinder block and head assembly for use in an internal combustion engine includes a closed-deck cylinder block having a deck and a water jacket, a cylinder head mounted on the deck and having a water jacket, and a gasket interposed between the cylinder block and the cylinder head. Communication passages are defined in the cylinder block, the cylinder head, and the gasket and provide communication between the water jackets in the cylinder block and the cylinder head. Recesses are defined adjacent to the communication passages and between the cylinder block and the cylinder head for increasing the pressure on the surfaces of the gasket between the cylinder block and the cylinder head through a reduction in the area of contact between the gasket surfaces and the cylinder block and head. In alternate embodiments the gasket or the cylinder block has holes providing communication between the recesses and the communication passages. Since the pressure on the gasket is increased per unit area, the gasket is highly effective in preventing a cooling liquid or oil from leaking out from between the cylinder block and the cylinder head.
摘要:
A roller mounting arrangement for a machine in which elongated material is shaped by rollers as the material progresses along a pathway. The rollers are mounted so that they are free to pivot and distribute forming pressure over a wider area of the material being shaped. The rollers have freedom to pivot about a plurality of axes. In a tandem mounting arrangement, the rollers have 3-axis freedom.
摘要:
The present invention is directed toward positioning tube (11) from a continuous supply of tube (11), into a preselected stacked configuration in a stack forming assembly (12) by movement of a fork member (22) positionable under selected of the tube (11). The invention includes moving the fork member (22) a preselected distance to position a preselected number of the tube (11) in the forming assembly (12) to form a row of preselected length, and then restraining the remainder of the supply of tube (11). The fork member (22) is then retracted a predetermined distance away from the forming assembly (12), and the forming assembly (12) is lowered so that additional tube (11) may be positioned on top of the tube (11) already positioned therein. The remainder of the tube (11) is then released while again moving the fork member (22) a preselected distance to position a preselected number of tube (11) on top of the tube (11) already positioned in the forming assembly (12). The steps are then repeated until the preselected stacked configuration is achieved. A-stop member (252) may be provided to help prevent vertical displacement of a lead tube (11b). Also, a belt (280) may be provided to prevent displacement of other tube (11) in a given row.
摘要:
The present invention is directed toward positioning tube (11) from a continuous supply of tube (11), in a preselected stacked configuration in a stack forming assembly (12) by movement of a fork member (22) positionable under selected of the tube (11). The invention includes moving the fork member (22) a preselected distance to position a preselected number of the tube (11) in the forming assembly (12), and then restraining the remainder of the supply of tube (11). The fork member (22) is then retracted a predetermined distance away from the forming assembly (12), and the forming assembly (12) is lowered so that additional tube (11) may be positioned on top of the tube (11) already positioned therein. The remainder of the tube (11) is then released while again moving the fork member (22) a preselected distance to position a preselected number of tube (11) on top of the tube (11) already positioned in the forming assembly (12). The steps are then repeated until the preselected stacked configuration is achieved.
摘要:
The invention is embodied in a tube cutting station in a tube producing mill. The cutting station includes a rotating press assembly and an axially moving cutting assembly. The cutting assembly is accelerated axially to a velocity which matches that of the tubing being produced. Once the cutting assembly reaches the same velocity as the tubing line, the press assembly can cause downward movement of a cutting blade through the tubing. The press assembly of the present invention is alternately rotated in opposite directions to maximize the rotational extent and time available for acceleration and deceleration of the press assembly, and therefore enables the use of lightweight drive motors. Slower acceleration and deceleration also reduces wear on components used to drive and stop the press assembly.
摘要:
A three-roll-type reducing mill including three forming rolls brought into contact with an outer periphery of an electro-resistance-welded steel tube for reducing its diameter. Two left and right sliding brackets respectively mounted with two follower forming rolls are sidden symmetrically with respect to a center of a main forming roll and simultaneously only by rotation of a single adjusting screw shaft, thereby enabling the diametrical reduction of the steel tube to be adjusted on-line and speedily.
摘要:
A crankshaft supporting structure in a multicylinder internal combustion engine has a cylinder block made of a light alloy and including a cylinder housing and a crankcase having a plurality of spaced journal walls. A plurality of spaced bearing caps made of an iron alloy are coupled respectively to the journal walls. A crankshaft is rotatably supported in bearing holes defined by the journal walls and the bearing caps. A bridge made of a light alloy extends across the bearing caps and is coupled to the bearing caps. The bearing caps and the bridge are fastened together to the journal walls by connecting bolts disposed one on each side of the crankshaft. The bridge has a main portion defining a main gallery extending longitudinally therethrough and a plurality of legs coupled to the bearing caps, respectively. The bearing caps and the legs jointly define branch oil passages communicating with the main gallery and the bearing holes. In one embodiment, each of the oil passages has a longitudinal central axis displaced transversely from the central axis of the cylinder housing passing through the center of the crankshaft.