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Technical Paper

Project-5 Axis CNC Auto-Riveting

1991-11-01
912647
To move this process into the world referred to as CNC, many traditional concepts need challenged. The manufacturing engineering environment must take the position that riveting can be a machine tool process capable of utilizing the latest in CNC technology. ...The manufacturing engineering environment must take the position that riveting can be a machine tool process capable of utilizing the latest in CNC technology. The ability to assemble components with a wide range of tolerances via the accuracy of computers is a reality if proper concepts are employed.
Technical Paper

CNC Fastening of Large Aircraft Structures

1993-11-01
931772
The use of CNC automatic fastening on large aircraft structures requires a process-oriented approach. Included in that process are factors related to the parts and assemblies, tooling, machine control data, as well as the automated fastening machine itself. ...This paper summarizes some challenges and solutions that occurred during the production implementation of such a CNC assembly process for very large aircraft structures.
Technical Paper

CNC Duct Riveting Work Cell

1994-10-01
941830
The CNC controlled automatic riveting work cell represents the latest State-Of-The-Art in automatic fastening machines and support hardware. ...The knee style machine was developed for fabricating tubular assemblies which are fed into the throat of the machine over an eight inch square lower knee. A CNC controlled four axis positioning system presents the part to the machine for riveting. Support systems include an automatic fastener feed system and a vacuum chip collection system. ...The work cell is controlled by an Allen Bradley series 9/290 enhanced CNC processor. The paper presents each individual system and it's role as part of the total CNC duct riveting work cell.
Technical Paper

Multi-Axis CNC Drill/Rivet Work Cell

1997-09-30
972810
The multiple axis flexible CNC riveting cell consists of three major systems: a multi-axis part positioner, a multiple head drill and rivet machine and a multi-bowl rivet feed system. ...The multiple axis flexible CNC riveting cell consists of three major systems: a multi-axis part positioner, a multiple head drill and rivet machine and a multi-bowl rivet feed system. The CNC positioner has six axis of control; the five common axis of X, Y, Z, Alpha, and Beta plus tool position on the lower ram.
Technical Paper

Multiple Axis CNC Riveting Cell

1996-10-01
961871
The multiple axis flexible CNC riveting cell consists of three major systems: a multi-axis part positioner, a multiple head drill and rivet machine and a multi-bowl rivet feed system. ...The multiple axis flexible CNC riveting cell consists of three major systems: a multi-axis part positioner, a multiple head drill and rivet machine and a multi-bowl rivet feed system. The CNC positioner has seven axis of control; the five common axis of X, Y, Z, Alpha, and Beta plus lower ram position and tool position on the knee style lower ram.
Journal Article

E7000 High-Speed CNC Fuselage Riveting Cell

2013-09-17
2013-01-2150
Electroimpact has recently produced a high-speed fuselage panel fastening machine which utilizes an all-electric, CNC-controlled squeeze process for rivet upset and bolt insertion. The machine is designed to fasten skin panels to stringers, shear ties, and other internal fuselage components. A high riveting rate of 15 rivets per minute was achieved on the first-generation E7000 machine. This rate includes drilling, insertion, and upset of headed fuselage rivets. The rivets are inserted by a roller screw-driven upper actuator, with rivet upset performed by a lower actuator driven by a high-load-capacity ball screw. The rivet upset process can be controlled using either position- or load-based feedback. The E7000 machine incorporates a number of systems to increase panel processing speed, improve final product quality, and minimize operator intervention.
Journal Article

High Accuracy Articulated Robots with CNC Control Systems

2013-09-17
2013-01-2292
Previous work has greatly reduced this error through the use of secondary scales and a mathematical model of the robot deflection running on a CNC controller. Further research improved upon this model by accounting for linear deformation of each robot link regardless of position.
Technical Paper

Advanced 7/24 Taper Toolholder/Spindle Interfaces for High-Speed CNC Machine Tools

1998-06-02
981866
The paper formulates basic requirements to the tool-holder/spindle interface for different machining operations. A comparison of some alternative and commercially available designs is presented. Two advanced interface designs which are fully compatible with existing 7/24 taper spindles and toolholders while providing enhanced accuracy in axial and radial directions, higher stiffness, insensitivity to high rpm, and reliability at high rpm are described and results of their evaluation are presented.
Technical Paper

The Economics of Retrofitting and Rebuilding Core Manufacturing Assets

1999-10-06
1999-01-3451
CNC technology is slowly finding its way into the manufacturing mainstream. Though the manufacturer often lacks the capital to invest in technically advanced equipment; there is a less expensive route to achieving this critical competitive edge. ...Rebuilding and retrofitting existing machine tools with the latest in CNC parts and accessories can reduce the burden of capital asset investment by 40% or more. The aerospace industry has been retrofitting riveters with the most innovative technological advancements in CNC controls and instrumentation to date. ...The aerospace industry has been retrofitting riveters with the most innovative technological advancements in CNC controls and instrumentation to date. Innovations in wing riveting have improved overall process simplicity, operability and part quality.
Journal Article

Processing CSeries Aircraft Panels

2013-09-17
2013-01-2149
This joint technical paper is presented by Bombardier, expounding on manufacturing process challenges with the C Series aircraft design requirements and Gemcor presenting a unique solution to automatically fasten CFRP aft fuselage panels and aluminum lithium (Al Li) cockpit panels with the same CNC Drivmatic® system. After installation and preliminary acceptance at Bombardier, the CNC system was further enhanced to automatically fasten the carbon fiber pressure bulkhead dome assembly. ...Bombardier faced new manufacturing process challenges drilling and fastening CSeries* aircraft panels with multi-material stacks of composite (CFRP), titanium and aluminum in which Gemcor responded with a unique, flexible CNC Drivmatic® automatic fastening system, now in production at Bombardier. This joint technical paper is presented by Bombardier, expounding on manufacturing process challenges with the C Series aircraft design requirements and Gemcor presenting a unique solution to automatically fasten CFRP aft fuselage panels and aluminum lithium (Al Li) cockpit panels with the same CNC Drivmatic® system.
Technical Paper

Refurbishment of 767 ASAT Drill-Rivet-Lockbolt Machines

2010-09-28
2010-01-1844
The machine was originally commissioned with a Terra five axis CNC control. The Terra company went out of business and the controls were replaced with a custom DOS application in 1990. ...Electroimpact proposed to retrofit with a Fanuc 31I CNC, and in addition, to replace all associated sensors, cables and feedback systems. This work is now complete on two of the four machines. ...Both left front and right front are in production with the new CNC control.
Magazine

Aerospace Engineering & Manufacturing 2010-03-24

2010-03-24
Machine programming investigates a new STEP While the machining industry has adapted to the 50-year-old standard for CNC machine language commonly known as G-Code, a community of engineers has worked on a replacement, the STEP AP238 protocol known as STEP-NC.
Technical Paper

High Path Accuracy, High Process Force Articulated Robot

2013-09-17
2013-01-2291
Each of the 7 axes is enhanced with secondary position encoders and the entire system is controlled by a Siemens 840Dsl CNC. The CNC handles all process functions, robot motion, and executes software technologies developed for superior dynamic positional accuracy, including enhanced kinematics.
Technical Paper

Rapid Prototyping of Production Tooling for the Composite General Aviation Industry

2002-04-16
2002-01-1525
Computer numerical control (CNC) robotic machining has demonstrated the capability to manufacture large, unique shapes, which are utilized for fabrication of industrial molds and tooling for composite parts. .... × 9.5 ft.) can be machined from low-density materials by 7-axis CNC robots operating from parallel tracks. This capability demonstrated that rapid prototyping is possible via both limited production and full production tooling/molds being machined from surface and/or solid computer models. ...By employing large CNC robots, tooling for the identical design developed and tested in the computer, may be manufactured with a very high degree of accuracy.
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