Abstract: A billet transport device inserts a billet emerging from a billet heater into a container of an extrusion press device, and includes a conveyor transporting a billet from a billet heater, an overhead type billet carrier directly transporting a billet from the conveyor to a billet loader, and a billet loader transporting a billet from the outside to inside of the extrusion press device. Further, the billet loader is comprised of an insertion roller device inserting a billet into a container and a billet insertion device placed at the front end of the billet loader.

Abstract: A shear device (21) of an extrusion press having a booster mechanism using an air cylinder or electric motor to supplement thrust to an amount corresponding to hydraulic pressure is provided. A fastening part pressing against a die stack (4) is configured by a booster mechanism using a lever and a shear guide (24) is pressed against a horseshoe (13) to fasten it in the extrusion direction. Further, a clearance between a surface of the die stack and a shear knife can be held constant. Also, a booster mechanism using a lever is employed for a tilt mechanism for the shear guide in the extrusion press.

Abstract: A direct double-action extrusion press includes a main crosshead to which an extrusion stem is fixed; a main cylinder having a main ram that advances the main crosshead and pressing on a billet; a piercer cylinder disposed inside the main ram and drives a mandrel; a plurality of side cylinders that retracts the main ram via the main crosshead; and a hydraulic circuit for supplying hydraulic oil to the main cylinder, the piercer cylinder, and the side cylinders. Cylinder chambers of the plurality of side cylinders on a side where the hydraulic oil is discharged when the main crosshead is advancing have a pressure-receiving area equal in total to that of a rod side chamber of the piercer cylinder. During billet extrusion, the hydraulic circuit causes fluid communication through the rod side chamber of the piercer cylinder and each cylinder chamber of the plurality of side cylinders on the side where the hydraulic oil is discharged.

Abstract: An extrusion press machine includes an end platen, a die, a container, container cylinders which move the container back and forth, a stem that pushes a billet in the container, and a main cylinder at the front end of the stem is provided and by which the stem can freely slide front and back, the extrusion press machine further including a plurality of hydraulic valves that supply hydraulic oil in the main cylinder to the container cylinders and which operate before the stem and the container retract in movement when discharging compressed air in the container after upset of the billet and further including a hydraulic valve that discharges hydraulic oil in the main cylinder into a tank, the hydraulic valves connected by a hydraulic pipeline, and the main cylinder and the container cylinders being able to be connected.

Abstract: The present invention provides an extrusion press which eliminates unevenness of dynamic and thermal fatigue degrees of the hydraulic devices which form the hydraulic circuit in the extrusion press, the electric motors which drive the hydraulic pump, the control devices, etc., which makes the dynamic and thermal fatigue degrees and remaining service lives of the component devices even, and which is excellent in energy saving effect. An extrusion press which has a plurality of variable capacity type hydraulic pumps connected to it in parallel for supplying working oil to hydraulic cylinders of the extrusion press, uses a preset working speed as the basis to find the required discharge rate of the hydraulic pumps, and selectively controls the drive operations of the hydraulic pumps, wherein the order of selection of the hydraulic pumps which are selectively controlled in drive operation is controlled by a program which progressively advances when a predetermined number of molding cycles are completed.

Abstract: An extrusion method using an extrusion press including an end platen to which a pressure ring is provided, a die, a container, a drive part for movement of the container, and a main cylinder device having an extrusion stem to form a billet into a shape includes extruding the billet loaded in the container by the extrusion stem from the die to shape it to an extruded material, releasing sealing pressure from the die, cutting the billet between the die and the container and between the die and the pressure ring by moving the die, and resuming shaping of extruded materials by the billet remaining inside the container.

Abstract: A data erasing method of the present disclosure is a data erasing method for erasing data stripe-recorded in a plurality of write-once optical discs constituting a redundant arrays of inexpensive disks (RAID) system and each including a plurality of data recording blocks and a redundant data block. In the data erasing method, alternate recording of at least one target block and the redundant data block is performed in a predetermined alternate area. The target block is one of the data recording blocks in which target data as erase target data is recorded. The target block is overwritten such that the target data is not correctly read.

Abstract: An information recording device includes: a storage in which a database is stored, the database managing data recorded in an optical disk and history data associated with the data; and a controller that controls recording, update, and erase of the data with respect to the optical disk. The history data is pre-update data when the data recorded in the optical disk is updated. The controller determines whether at least one piece of history data associated with target data exists when the target data recorded in the optical disk is erased, and the controller erases the target data and the history data associated with the target data on the optical disk when at least the one piece of history data associated with the target data exists.

Abstract: A container degassing device for an extrusion press is equipped with: a integrally formed degassing block joined to the end surface of the container of the extrusion press; a first sealing member that seals the degassing block; a second sealing member that seals the outer peripheral surface of an extrusion stem or a fixed dummy block of the extrusion press; and a vacuum suction device that sucks air from within a degassing space formed within the container. The degassing space is sealed by the degassing block and the first and second sealing members, and the area between the degassing block and the container end surface is sealed by a metal touch.

Abstract: A double-action extrusion press obtains a tubular product, wherein the pressure-receiving surface area of a cylinder chamber on the side from which hydraulic oil is discharged from a container cylinder and the pressure-receiving surface area on the rod-side chamber of a piercer cylinder are set to be the same when a container moves in the extrusion direction, and the cylinder chamber on the side from which hydraulic oil is discharged from the container cylinder and the rod-side chamber of the piercer cylinder are connected by an oil pressure conduit and are in communication with each other when a billet is extruded from the extrusion stem after piercing has been completed.

Abstract: A direct double-action extrusion press includes a main crosshead to which an extrusion stem is fixed; a main cylinder having a main ram that advances the main crosshead and pressing on a billet; a piercer cylinder disposed inside the main ram and drives a mandrel; a plurality of side cylinders that retracts the main ram via the main crosshead; and a hydraulic circuit for supplying hydraulic oil to the main cylinder, the piercer cylinder, and the side cylinders. Cylinder chambers of the plurality of side cylinders on a side where the hydraulic oil is discharged when the main crosshead is advancing have a pressure-receiving area equal in total to that of a rod side chamber of the piercer cylinder. During billet extrusion, the hydraulic circuit causes fluid communication through the rod side chamber of the piercer cylinder and each cylinder chamber of the plurality of side cylinders on the side where the hydraulic oil is discharged.

Abstract: An extrusion press includes a means which can prevent phenomena in which a billet is blown out during an extrusion process as well as prevent billet blowout with a simple and inexpensive constitution. The extrusion press drives a main cylinder device to extrude, by a stem , a billet filled into a container from a die and form a product. A gap measurement means that measures a gap arising at the container seal surface formed by pressing the die side end surface of the container against the container side end surface of the die is provided on an end platen on the outer edge part of the container side end surface of the die. When the gap arising during the extrusion process is measured and the measured value is within a predetermined range of allowable values, a set value for the extrusion rate is lowered and a warning is issued. When the measured value exceeds the predetermined allowable values, the extrusion process is stopped.

Abstract: A container degassing device for an extrusion press is equipped with: a integrally formed degassing block joined to the end surface of the container of the extrusion press; a first sealing member that seals the degassing block; a second sealing member that seals the outer peripheral surface of an extrusion stem or a fixed dummy block of the extrusion press; and a vacuum suction device that sucks air from within a degassing space formed within the container. The degassing space is sealed by the degassing block and the first and second sealing members, and the area between the degassing block and the container end surface is sealed by a metal touch.

Abstract: A half thrust bearing having a semicircular ring shape for receiving an axial force of a crankshaft of an internal combustion engine is provided. The half thrust bearing includes thrust reliefs formed adjacently to end surfaces on both sides in a circumferential direction on a slide surface side which receives the axial force so that wall thicknesses become thinner toward the end surfaces. The thrust relief on a rear side in a rotational direction of the crankshaft or both thrust reliefs are formed so that a length of the thrust relief in an inner end portion in a radial direction of the half thrust bearing is longer than a length of the thrust relief in an outer end portion in the radial direction of the half thrust bearing.

Abstract: A double action extrusion press has: a main crosshead provided freely movable with the application of pressure in an axial direction by a main cylinder and having a pressing system disposed on the tip thereof; and a piercer cylinder built into the main cylinder and provided within the main ram, allowing a mandrel to slide within the pressing system and the main crosshead. The double action extrusion press complements the extrusion force by force equivalent to a mandrel pull force acting on a mandrel stop rod by affixing the piercer cylinder in contact to a piercer crosshead that is joined with the mandrel stop rod and applying hydraulic force to the rod side of the piercer cylinder.

Abstract: Measured signal quality information obtained by measuring signal quality information showing signal quality obtained when an information reproduction device reproduces information from an information recording medium includes a device-caused variation which is a variation in the signal quality information that has degraded due to the information reproduction device, and a medium-caused variation which is a variation in the signal quality information that has degraded due to the information recording medium. A signal-quality-information correction device includes a device-caused-variation detection section which detects the device-caused variation included in the measured signal quality information, and a signal-quality-information correction section which corrects the measured signal quality information to signal quality information resulting from removal of the device-caused variation detected by the device-caused-variation detection section from the measured signal quality information.

Abstract: An extrusion press includes an end platen, a fixed platen arranged at the rear thereof, a tie rod configured to link the end platen and the fixed platen, a die, a container loaded with a billet, an extrusion stem configured to press the billet, a crosshead attached with the extrusion stem, and an extrusion drive configured to reciprocate the extrusion stem. The extrusion drive includes a rotatable wire drum driven by an electric extrusion main motor and drives the extrusion stem to perform extrusion molding by winding the wire by rotating the wire drum.

Abstract: A double-action extrusion press obtains a tubular product, wherein the pressure-receiving surface area of a cylinder chamber on the side from which hydraulic oil is discharged from a container cylinder and the pressure-receiving surface area on the rod-side chamber of a piercer cylinder are set to be the same when a container moves in the extrusion direction, and the cylinder chamber on the side from which hydraulic oil is discharged from the container cylinder and the rod-side chamber of the piercer cylinder are connected by an oil pressure conduit and are in communication with each other when a billet is extruded from the extrusion stem after piercing has been completed.

Abstract: A bearing device includes: a journal part, a main bearing, a cylinder block, and a bearing cap. One half bearing held by the cylinder block includes: a first circumferential oil groove and a second circumferential oil groove being formed at positions opposite to an inlet of an oil passage of the journal part; a separation part separating the first circumferential oil groove and the second circumferential oil groove; and an oil hole penetrating from the first circumferential oil groove to an outer circumferential surface. A length L1 in a circumferential direction of the separation part at a position in the inner circumferential surface of the one half bearing is smaller than a length L2 in the circumferential direction of the inlet of the journal part.

Abstract: A change necessity determination unit (12) determines necessity of change of a monitoring time interval of each performance item from a performance value of at least one performance item held by a performance value holding unit (11). A time interval computation unit (15) shortens a monitoring time interval of a performance item, for which the monitoring time interval is determined to need to be shortened by the change necessity determination unit (12), and extends a monitoring time interval of at least one performance item other than the performance item for which the monitoring time interval is determined to need to be shortened. A time interval update unit (16) updates the monitoring time interval held by the time interval holding unit (10), to the monitoring time interval of each performance item, which is computed by the time interval computation unit (15).