A system for manufacturing a tubular member includes a mandrel configured to be inserted within a throughbore of the tubular member to engage with an inner diameter of the throughbore. In addition, the system includes a die assembly comprising a cavity. The die assembly is configured to be disposed about an outer surface of the tubular member such that a central portion of the tubular member is aligned with the cavity. Further, the system includes a ram configured to apply a load to the tubular member along a central axis of the tubular member to expand the central portion of the outer surface of the tubular member into the cavity to form an upset region along the tubular member.

A check valve includes a container body and a valve body. The container body includes a cylindrical valve-body housing portion, an inlet portion, an outlet portion, and a valve seat. The inlet portion is formed at one end portion of the valve-body housing portion, and the outlet portion is formed at the other end portion of the valve-body hosing portion. The valve seat is protruded at an inner circumferential surface of the valve-body housing portion. The valve body is provided in the container body and movable in the axial direction thereof.

A method for manufacturing a hollow camshaft is provided, and more particularly, a method for manufacturing a combined hollow camshaft by an axial-compression upsetting-deformation technique. The present method solves a problem that the current camshaft manufactured in an internal high-pressure expansion manner in the prior art has the insufficient locking force to cause the loosening of a cam. The method is as follows: a camshaft is formed by combining two independent units, namely a cam and a shaft tube. Non-circular countersinks are distributed on two sides of the cam. Thrust steps are formed on the shaft tube correspondingly. The cam is placed between the two thrust steps of the shaft tube. The locking force is applied to the cam by utilizing the thrust steps on the two sides of the cam based on thermal expansion and contraction. Simultaneously, the thrust steps lock the cam with the countersinks.

A method for forging a niobium-tungsten alloy forged ring, including: (S1) subjecting an alloy ingot to turning, chamfering, spraying with an anti-oxidation coating, stainless-steel sheathing, heating and upsetting to obtain a primary pancake with a flat-die hammer, rapid-forging press or hydraulic press; (S2) subjecting an inner pole to wire electrical discharge machining to obtain a ring blank followed by machining to remove the stainless-steel sheath and oxide scale and defects; and subjecting the ring blank to fluorescent/dye penetrant inspection followed by vacuum stress-relief annealing; (S3) subjecting the ring blank to core shaft/saddle forging on the flat-die hammer or rapid-forging press to obtain a crude forged ring; and (S4) subjecting the crude forged ring to vacuum recrystallization annealing to obtain a desired forged ring.

The present invention relates to a forging method and a forging apparatus, capable of: reducing the amount of tray plates used during the forging of materials by reducing the width from front to back of the tray plates by fixing only the rear of the materials to the tray plates for fixing the materials; and minimizing the amount of materials used, by compression-molding products by fixing, to the tray plates, the materials having a minimum size necessary for the fmal products, the present invention comprising: a press having upper and lower molds; a tray plate supply means for supplying, to the top rear of the lower mold, tray plates to be vertically movable from one side to the other side by a pitch and to be spaced from the upside of the lower mold; a punching unit provided at one side of the upper and lower molds so as to continuously punch material fixing hole parts in the tray plates; a material plate supply means provided at the front of the other side of the punching unit so as to supply material plates by a pitch to under the material fixing hole parts of the tray plates and, at the same time, form penetrating protrusion parts, which penetrate into the material fixing hole parts, on the rear top of the material plate in each pitch, which is moved by a pitch; a cutting and compressive fixing unit provided on the upper and lower molds at the other side of the punching unit so as to cut the material plates, which are inserted into the material fixing hole parts of the tray plates, by a pitch and, at the same time, allow the penetrating protrusion parts formed at the rear of the cut materials to penetrate into the material fixing hole parts, thereby compressively fixing same; and a compression molding unit provided on the upper and lower molds at the other side of the cutting and compressive fixing unit so as to compression-mold the materials being transferred.

The present invention relates to a forging method and a forging apparatus, capable of: reducing the amount of tray plates used during the forging of materials by reducing the width from front to back of the tray plates by fixing only the rear of the materials to the tray plates for fixing the materials; and minimizing the amount of materials used, by compression-molding products by fixing, to the tray plates, the materials having a minimum size necessary for the fmal products, the present invention comprising: a press having upper and lower molds; a tray plate supply means for supplying, to the top rear of the lower mold, tray plates to be vertically movable from one side to the other side by a pitch and to be spaced from the upside of the lower mold; a punching unit provided at one side of the upper and lower molds so as to continuously punch material fixing hole parts in the tray plates; a material plate supply means provided at the front of the other side of the punching unit so as to supply material plates by a pitch to under the material fixing hole parts of the tray plates and, at the same time, form penetrating protrusion parts, which penetrate into the material fixing hole parts, on the rear top of the material plate in each pitch, which is moved by a pitch; a cutting and compressive fixing unit provided on the upper and lower molds at the other side of the punching unit so as to cut the material plates, which are inserted into the material fixing hole parts of the tray plates, by a pitch and, at the same time, allow the penetrating protrusion parts formed at the rear of the cut materials to penetrate into the material fixing hole parts, thereby compressively fixing same; and a compression molding unit provided on the upper and lower molds at the other side of the cutting and compressive fixing unit so as to compression-mold the materials being transferred.

Provided are a hollow drive shaft using an upsetting method and a method of manufacturing the same, in which hot forging and upsetting processes are applied to both ends of a workpiece so that an outer diameter at both ends of the workpiece is greater than an outer diameter of a middle part of the workpiece, thereby reducing a weight of the drive shaft and enabling the drive shaft to transmit higher driving power. According to the present invention, the upsetting process is applied during the hot forging process to manufacture the hollow drive shaft, portions to be substantially processed are limited to portions at both ends of the workpiece, and the number of upsetting processes is limited to a minimum number (2 or the like), such that initial investment costs and manufacturing costs are low because the number of processes is small.

Provided are a hollow drive shaft using an upsetting method and a method of manufacturing the same, in which hot forging and upsetting processes are applied to both ends of a workpiece so that an outer diameter at both ends of the workpiece is greater than an outer diameter of a middle part of the workpiece, thereby reducing a weight of the drive shaft and enabling the drive shaft to transmit higher driving power. According to the present invention, the upsetting process is applied during the hot forging process to manufacture the hollow drive shaft, portions to be substantially processed are limited to portions at both ends of the workpiece, and the number of upsetting processes is limited to a minimum number (2 or the like), such that initial investment costs and manufacturing costs are low because the number of processes is small.

Provided are a motor device and a method for manufacturing the same that can accurately and consistently provide a support shaft to a case and enhance the strength for fixing the support shaft to the case. A small-diameter part having a smaller diameter than a large-diameter part is formed through drawing. The large-diameter part and a step part are embedded in a gear case. The small-diameter part is exposed outside the gear case. The dimensional accuracy (dimensional tolerance ±α) of the external diameter of the small-diameter part is enhanced. The small-diameter part can be set, without rattling, in a lower mold for molding the gear case. Consequently, the support shaft can be accurately and consistently provided to the gear case. Because the large-diameter part and the step part are embedded in the gear case, the resistance of the support shaft against pulling from the gear case can be enhanced.

The present disclosure provides a pulse current assisted uncanned rolling method for titanium-TiAl composite plates, including the following specific steps: 1. preparing titanium alloy sheets; 2. preparing TiAl alloy sheets; 3. uncanned lay-up; 4. pulse current assisted hot-rolling; 5. separation and subsequent processing, thus getting the titanium-TiAl composite plates. The composite plates are of good quality on the surface without oxide layer shedding, no cracks at the edges and the ends, with uniform and fine microstructures, good bonding interface and excellent mechanical properties.