One or more trays for use in distillation columns and methods of manufacture of such trays. The trays include a plate having a plurality of through holes that extend between a first surface of the plate and a second surface of the plate. The plurality of through holes include a first set of through holes each having substantially a first diameter and a second set of through holes each having substantially a second diameter that is different from the first diameter. The trays also include a weir coupled to the plate and extending from the first surface. The weir is positioned between the first set of through holes and the second set of through holes.

One or more trays for use in distillation columns and methods of manufacture of such trays. The trays include a plate having a plurality of through holes that extend between a first surface of the plate and a second surface of the plate. The plurality of through holes include a first set of through holes each having substantially a first diameter and a second set of through holes each having substantially a second diameter that is different from the first diameter. The trays also include a weir coupled to the plate and extending from the first surface. The weir is positioned between the first set of through holes and the second set of through holes.

The present disclosure discloses a cutting method for an aluminum alloy casting, and a trimming die. The cutting method for the aluminum alloy casting includes the following steps of: drilling a part to be cut off of the aluminum alloy casting by multiple annular drills, and withdrawing the annular drills when the annular drills drill to a preset position; and separating multiple scraps to be separated from the aluminum alloy casting by the trimming die.

The present disclosure discloses a cutting method for an aluminum alloy casting, and a trimming die. The cutting method for the aluminum alloy casting includes the following steps of: drilling a part to be cut off of the aluminum alloy casting by multiple annular drills, and withdrawing the annular drills when the annular drills drill to a preset position; and separating multiple scraps to be separated from the aluminum alloy casting by the trimming die.

A drilling method of machining holes that are not regularly arranged in one direction in a short machining time is provided. A drilling method, includes: creating a machining order of machining a first hole to be machined with a first spindle and a second hole to be machined with a second spindle for a workpiece having a plurality of target holes on a machining table, the first spindle and the second spindle arranged in X direction; rotating the machining table relative to the first spindle and the second spindle so that the first hole and the second hole are arranged in X direction with the first hole located nearer to the first spindle; moving the first spindle and the second spindle relative to the machining table so that the first hole and a center of the first spindle are aligned and the second hole and a center of the second spindle are aligned; and machining the first hole with the first spindle and the second hole with the second spindle.

A drilling method of machining holes that are not regularly arranged in one direction in a short machining time is provided. A drilling method, includes: creating a machining order of machining a first hole to be machined with a first spindle and a second hole to be machined with a second spindle for a workpiece having a plurality of target holes on a machining table, the first spindle and the second spindle arranged in X direction; rotating the machining table relative to the first spindle and the second spindle so that the first hole and the second hole are arranged in X direction with the first hole located nearer to the first spindle; moving the first spindle and the second spindle relative to the machining table so that the first hole and a center of the first spindle are aligned and the second hole and a center of the second spindle are aligned; and machining the first hole with the first spindle and the second hole with the second spindle.

Methods and apparatuses for providing a clamp-up are provided. The methods and apparatuses include reaching through a first hole in a first part to grip a wall that defines a second hole in a second part to thereby pull the second part against the first part.

A method and rivet apparatus comprise a rivet block, the rivet block comprising a rivet block, a pin bore, and a rivet feed bore. The rivet block is comprised of a top end and a bottom end. The pin bore includes a top end and a bottom end and is disposed within the rivet block. The pin bore extends from the top end to the bottom end of the rivet block and guides a rivet pin that slides downward within the pin bore to push a head of a rivet into a workpiece. The rivet feed bore includes a top end and a bottom end and is disposed within the rivet block. The rivet feed bore extends from the top end to the bottom end of the rivet block, accepts the rivet at the top end of the rivet feed bore, and guides the rivet to the bottom end of the rivet feed bore. The rivet feed bore intersecting the pin bore between the top end and the bottom end of the pin bore at an oblique angle.

A method and rivet apparatus comprise a rivet block, the rivet block comprising a rivet block, a pin bore, and a rivet feed bore. The rivet block is comprised of a top end and a bottom end. The pin bore includes a top end and a bottom end and is disposed within the rivet block. The pin bore extends from the top end to the bottom end of the rivet block and guides a rivet pin that slides downward within the pin bore to push a head of a rivet into a workpiece. The rivet feed bore includes a top end and a bottom end and is disposed within the rivet block. The rivet feed bore extends from the top end to the bottom end of the rivet block, accepts the rivet at the top end of the rivet feed bore, and guides the rivet to the bottom end of the rivet feed bore. The rivet feed bore intersecting the pin bore between the top end and the bottom end of the pin bore at an oblique angle.

Wall sealing and penetrator apparatus for use in penetrating walls in dangerous conditions. An example wall sealing and penetrator apparatus includes a first portion comprising: a first housing, a first sealing element, a first vacuum port; and a second portion comprising, a second housing, a second sealing element, a second vacuum port, and a cutting element.