초록 ▼

A vehicular vehicle exhaust system and method for manufacturing same using hydroforming and magnetic impulse welding techniques is disclosed. An exhaust system of the invention includes a flange adapted for connection to an exhaust manifold of an engine of a vehicle, a first exhaust tube having a fi

A vehicular vehicle exhaust system and method for manufacturing same using hydroforming and magnetic impulse welding techniques is disclosed. An exhaust system of the invention includes a flange adapted for connection to an exhaust manifold of an engine of a vehicle, a first exhaust tube having a first end connected to the flange and a second end expanded to form a first portion of a chamber, and a second exhaust tube having a first end expanded to form a second portion of a chamber closure and a second end open to atmosphere. The end portions of the first and second tubes may be formed to desired shapes using a hydroforming process. The second portion of the chamber is sized to fit inside the first portion of the chamber and can be secured thereto by magnetic pulse welding techniques. The exhaust system can further include a retainer tube that is connected to the first and second tubes by magnetic pulse welding techniques.

대표청구항 ▼

A vehicular vehicle exhaust system and method for manufacturing same using hydroforming and magnetic impulse welding techniques is disclosed. An exhaust system of the invention includes a flange adapted for connection to an exhaust manifold of an engine of a vehicle, a first exhaust tube having a fi

A vehicular vehicle exhaust system and method for manufacturing same using hydroforming and magnetic impulse welding techniques is disclosed. An exhaust system of the invention includes a flange adapted for connection to an exhaust manifold of an engine of a vehicle, a first exhaust tube having a first end connected to the flange and a second end expanded to form a first portion of a chamber, and a second exhaust tube having a first end expanded to form a second portion of a chamber closure and a second end open to atmosphere. The end portions of the first and second tubes may be formed to desired shapes using a hydroforming process. The second portion of the chamber is sized to fit inside the first portion of the chamber and can be secured thereto by magnetic pulse welding techniques. The exhaust system can further include a retainer tube that is connected to the first and second tubes by magnetic pulse welding techniques. the rotary drill bit against at least a first subterranean formation under weight on bit and engaging the at least first subterranean formation with the plurality of discrete post-like structures wearing a portion of at least one discrete post-like structures of the plurality as it is engaged with the at least first subterranean formation such that it exposes diamond grit contained in the at least one discrete post-like structure and enlarging a surface area of the at least one discrete post-like structure as it wears against the at least first formation such that an increasing surface area including diamond grit is exposed. 47. The method of claim 46, further comprising wearing the plurality of discrete post-like structures down to the blades and continuing to engage the at least a first formation with diamond grit carried in the blades. 48. A rotary drag bit for drilling subterranean formations, comprising: a bit body having a face extending from a centerline to a gage, the face including a cone portion surrounding the centerline; a plurality of blades on the face extending generally radially outwardly toward the gage; a plurality of discrete, mutually separated cutting structures comprising a particulate abrasive material protruding upwardly from each of the blades; and a plurality of polycrystalline diamond compact (PDC) cutters disposed on the face within the cone portion, wherein the discrete cutting structures are configured as posts, the posts including bases of larger cross-sectional area than outermost ends thereof and wherein the posts taper from substantially circular outermost ends to substantially oval bases. 49. A rotary drag bit for drilling subterranean formations, comprising: a bit body having a face extending from a centerline to a gage, the face including a cone portion surrounding the centerline; a plurality of blades on the face extending generally radially outwardly toward the gage; a plurality of discrete, mutually separated cutting structures comprising a particulate abrasive material protruding upwardly from each of the blades; and a plurality of polycrystalline diamond compact (PDC) cutters disposed on the face within the cone portion, wherein at least one of the plurality of discrete cutting structures is formed as a h