The invention discloses a process of manufacturing heavy and critical components such as a blowout preventer (BOP) with a combination of open die forging, piercing and machining process which results in to better material utilization and saving in the machining time. The forging process of the invention involves a step of notching, wherein a transverse notch is made near each end of the ingot before cogging said ingot. The invention allows development of safety and critical components with effective material utilisation.

The invention discloses a process of manufacturing heavy and critical components such as a blowout preventer (BOP) with a combination of open die forging, piercing and machining process which results in to better material utilization and saving in the machining time. The forging process of the invention involves a step of notching, wherein a transverse notch is made near each end of the ingot before cogging said ingot. The invention allows development of safety and critical components with effective material utilisation.

A method of manufacturing a lash adjuster body for use in a lash adjuster assembly can include forming a lash adjuster body to an as-formed condition including an outer cylindrical surface and an inner cylindrical surface. The inner cylindrical surface can have a leak down portion and a blind bore. The method can also include imparting a wear resistant surface layer to at least the leak down portion of the inner cylindrical surface with a sub-critical temperature process. The method can also include preserving the leak down portion in the as-formed condition during imparting of the wear resistant surface layer.

A lined butterfly valve and manufacturing method, the lined butterfly valve including a valve disk (2) with a core metal (20) covered with a lining layer (22) provided rotatably inside a body (3) by a stem (5). The lining layer includes a front/back-side lining part (32) provided on each of front and back sides of the core metal and an outer circumferential lining part (33) provided on an outer circumferential side of the core metal. The front/back-side lining part is provided on each of the front and back sides of the core metal in which no occurrence of warpage is assumed so as to have a thickness T1, and the outer circumferential lining part has a thickness T2 from an outer circumferential end of the core metal to a tip seal surface of an outer circumferential end of the valve disk.

A lined butterfly valve and manufacturing method, the lined butterfly valve including a valve disk (2) with a core metal (20) covered with a lining layer (22) provided rotatably inside a body (3) by a stem (5). The lining layer includes a front/back-side lining part (32) provided on each of front and back sides of the core metal and an outer circumferential lining part (33) provided on an outer circumferential side of the core metal. The front/back-side lining part is provided on each of the front and back sides of the core metal in which no occurrence of warpage is assumed so as to have a thickness T1, and the outer circumferential lining part has a thickness T2 from an outer circumferential end of the core metal to a tip seal surface of an outer circumferential end of the valve disk.

A chuck device in a robot hand is used when receiving a primary formed workpiece from electrode chucks. After receiving the primary formed workpiece, and before inserting the primary formed workpiece from its shaft stem part into an insertion hole in a forging press main body, a portion held by the electrode chucks of the primary formed workpiece is gripped by a chuck device different from the chuck device, to release the gripping of the primary formed workpiece by the chuck device. Therefore, it is possible to insert the holding portion held by the electrode chucks from the side of the shaft stem part of the primary formed workpiece into the insertion hole. Thereby providing a bar material transfer method capable of accurately inserting the bar material from its one end into a predetermined positioning hole even if a bar material serving as a workpiece is short.

[Object] To provide a bar material transfer method of, even in the case where an entire length of a bar material serving as a workpiece is short, accurately inserting the bar material from one end thereof into a predetermined positioning hole.

[Solving Means] At the time of receiving a primary formed workpiece W1 from electrode chucks 22, a chuck device 64A (64B) in a robot hand 62c is used, and after receiving the primary formed workpiece W1, and before inserting the primary formed workpiece W1 from a stem part W11 thereof into an insertion hole 12 in a forging press main body 10, a holding portion W11a held by the electrode chucks 22 of the primary formed workpiece W1 is gripped by a chuck device 65A (65B) different from the chuck device 64A (64B), to release the gripping of the primary formed workpiece W1 by the chuck device 64A (64B). In accordance with this, it is possible to insert the holding portion W11a held by the electrode chucks 22 on the side of the stem part W11 of the primary formed workpiece W1 into the insertion hole 12.

[Object] To provide a bar material transfer method of, even in the case where an entire length of a bar material serving as a workpiece is short, accurately inserting the bar material from one end thereof into a predetermined positioning hole.

[Solving Means] At the time of receiving a primary formed workpiece W1 from electrode chucks 22, a chuck device 64A (64B) in a robot hand 62c is used, and after receiving the primary formed workpiece W1, and before inserting the primary formed workpiece W1 from a stem part W11 thereof into an insertion hole 12 in a forging press main body 10, a holding portion W11a held by the electrode chucks 22 of the primary formed workpiece W1 is gripped by a chuck device 65A (65B) different from the chuck device 64A (64B), to release the gripping of the primary formed workpiece W1 by the chuck device 64A (64B). In accordance with this, it is possible to insert the holding portion W11a held by the electrode chucks 22 on the side of the stem part W11 of the primary formed workpiece W1 into the insertion hole 12.

A cam follower for a valve train of an internal combustion engine, the cam follower being formed as a lever, which is U-shaped in cross-section, and produced from steel sheet without machining, and which has a floor wall (3) and lateral walls (4 and 5) extending therefrom, wherein a valve stem support (10) is disposed as a groove (11) at one end of the lever in a surface of the floor wall (3) facing away from the lateral walls (4 and 5). Lateral guide walls (12 and 13) of the valve stem support (10) are formed by chipless shaping so as to extend from and counter to the lateral walls (4 and 5) and are connected to a support wall (14) that forms a valve stem support surface (10a). The valve stem support surface (10a) extends in a first plane (10b), which is spaced from a second plane (16a), which extends through an internal transition (15, 16) between the lateral walls (4 and 5) and the adjacent guide walls (12 and 13), in the direction of ends (19, 20) of the lateral walls (4 and 5). In order to reduce stress and resulting cracks, an inner radius R is provided at the transition (15 and 16), by which radius a free space (17, 18) is created between the lateral wall (4, 5) and the guide wall (12, 13), which free space narrows towards the end (19, 20) of the respective lateral wall (4, 5).