The present invention provides a disc wheel with variable thickness for agricultural tractor application. According to an embodiment, a disc wheel with variable thickness includes an axle mounting area 201, an axle mounting radius area 202, a wheel weight mounting area 203 and a connection bracket mounting area 204, wherein said disc wheel includes maximum thickness at the axle mounting area 101 and at the connection bracket mounting area 204. The disc wheel 200 uses less material input for imparting high strength. Further, the disc wheel 200 with variable thickness prevents bolt hole failures by providing higher strength at a centre. The thickness from the axle mounting area 201 gradually decreases up to the end of the wheel mounting area 203 and matches the thickness at the connection bracket mounting area 204. The disc wheel 200 with variable thickness is achieved using flow forming process 402.

The present invention provides a disc wheel with variable thickness for agricultural tractor application. According to an embodiment, a disc wheel with variable thickness includes an axle mounting area 201, an axle mounting radius area 202, a wheel weight mounting area 203 and a connection bracket mounting area 204, wherein said disc wheel includes maximum thickness at the axle mounting area 101 and at the connection bracket mounting area 204. The disc wheel 200 uses less material input for imparting high strength. Further, the disc wheel 200 with variable thickness prevents bolt hole failures by providing higher strength at a centre. The thickness from the axle mounting area 201 gradually decreases up to the end of the wheel mounting area 203 and matches the thickness at the connection bracket mounting area 204. The disc wheel 200 with variable thickness is achieved using flow forming process 402.

A brake disc to be mounted on an axle hub, including sliding surfaces with which friction members respectively come into a sliding contact and which face in mutually opposite directions, wherein the brake disc includes: a first member having a disc-like shape and including a mount portion through which the brake disc is mounted on an axle hub and a radially outer portion located radially outward of the mount portion, one of the sliding surfaces being formed on the radially outer portion; and a second member having a doughnut plate shape, the other of the sliding surfaces being formed on the second member, and wherein the first member and the second member are bonded through a protruding portion formed on one of the radially outer portion of the first member and the second member and protruding toward the other of the radially outer portion and the second member.

A brake disc to be mounted on an axle hub, including sliding surfaces with which friction members respectively come into a sliding contact and which face in mutually opposite directions, wherein the brake disc includes: a first member having a disc-like shape and including a mount portion through which the brake disc is mounted on an axle hub and a radially outer portion located radially outward of the mount portion, one of the sliding surfaces being formed on the radially outer portion; and a second member having a doughnut plate shape, the other of the sliding surfaces being formed on the second member, and wherein the first member and the second member are bonded through a protruding portion formed on one of the radially outer portion of the first member and the second member and protruding toward the other of the radially outer portion and the second member.

A forging and inclined window hole punching composite die includes an upper die holder, a connection sleeve, an upper die sliding sleeve, a pressure plate, inclined window puncher pins, a center puncher pin, first connection screw rods, first springs, second connection screw rods, second springs, hydraulic assistant systems, a lower die and a bottom plate. Bottom surface of the pressure plate of the composite die is a plane to avoid deformation of a front molding surface. Hydraulic power is added to the inclined window puncher pins to increase the pressure for punching inclined holes, avoid quality problems and increase a demolding force. A multi-split synchronous hydraulic device may well realize synchronization of the plurality of inclined window puncher pins.

Provided are discs and bores of a gas turbine engine having one or more graphene layers and methods of preparing the same. The one or more graphene layers are disposed adjacent to the disc rim and/or bore to improve heat transfer and reduce oxidation of the discs. Methods of preparing the graphene layers and systems for using the same are provided.

Provided are discs and bores of a gas turbine engine having one or more graphene layers and methods of preparing the same. The one or more graphene layers are disposed adjacent to the disc rim and/or bore to improve heat transfer and reduce oxidation of the discs. Methods of preparing the graphene layers and systems for using the same are provided.

Aluminum alloys described herein include silicon, iron, copper, manganese, magnesium, and chromium. In various implementations, the aluminum alloys also include one or more of zinc and titanium. Typically, a total amount of iron and manganese in the aluminum alloys is no less than 0.28% by weight and no greater than 0.45% by weight, and the grains in the aluminum alloys have an average grain length of no greater than 6 mm. Aluminum alloy billets can be forged for wheel production at selected temperatures.

Aluminum alloys described herein include silicon, iron, copper, manganese, magnesium, and chromium. In various implementations, the aluminum alloys also include one or more of zinc and titanium. Typically, a total amount of iron and manganese in the aluminum alloys is no less than 0.28% by weight and no greater than 0.45% by weight, and the grains in the aluminum alloys have an average grain length of no greater than 6 mm. Aluminum alloy billets can be forged for wheel production at selected temperatures.

The brake disc includes two first members and at least one second member. Each of the first members has a sliding surface, and has almost a disc shape or an almost annular plate shape. The second member has a plurality of fins and a fin holding part. Each of the two first members and the at least one second member is manufactured by pressing. The brake disc is manufactured as the two first members and the at least one second member manufactured by pressing are joined to each other.