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240 Landmarks of Japanese Automotive Technology
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240 Landmarks TopProduction > CAD-1
 CAD-1
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After General Motors released DAC-1 in 1964, development of CAD progressed in various companies until their technical level was almost equal to General Motors by the 1970s.
Nissan had been working on computerizing each process using the CADANCE (Computer Aided Design & Numerical Engineering) system. The system was completed as an integrated system usable for study drawings for production vehicles and formal drawings for prototype vehicles.
A monitor program controls a diagram creation program, mesh creation program, fairing program, etc. and the system runs under PLAN (Problem Language Analyzer developed by IBM). Data itself is handled by the virtual memory method.
The mesh creation program composes 3D line data using continuous data from online measuring devices. The fairing program basically replaces data with elastic beams to determine shapes that minimize the energy of the beams.
It is possible to create NC tapes online for master model machining based on data files.
Taking prototype vehicles as an example, the following items were created by this system.
1) List of measuring points
2) Curve fitting drawings that complement the measuring points.
3) Diagrams with fairings
4) Curved glass flange lines, windshield flange lines, roof rail drawings
5) Cross section drawings for jig design
CAD-1 application for auto body design operations started in 1977, and in 1978, CAD/CAM data integration was achieved in mass-production stamping die processing.
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Storage location:NISSAN MOTOR CO., LTD., VEHICLE ADVANCED DEVELOPMENT DEPT. (560-2, Okatsukoku, Atsugi-shi, Kanagawa 243-0126)
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Year manufactured:1971
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Manufacturer:Nissan Motor Corporation
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Classification:Other (literature)
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Current status:In storage: not open to the public
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Company name:Nissan Motor Corporation
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Familiar name:CAD-1
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Year of manufacture:1971
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Structure, type, measure, means, etc.:CAD/CAM was developed to improve efficiency in processes from design to production of automotive parts using computers and to shorten lead time for new vehicle development.
Body outer panels involve processes from measurements of clay models, numeric data file creation for auto body outer panels, drawing creation using the data files, and data creation for the NC machining device. Automation of this series of processes was required. This is an online system that organically integrated a large scale computer, graphic display, measuring device, automatic drawing device, etc.
Its hardware included interfaces such as the IBM360M5 graphic display, and paper tape input/output device. Large amounts of data were handled using list processing and virtual memory methods, and software was developed to define body shapes mathematically.
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Function, effect, etc.:CAD systems were originally used for structural studies in body design. However, after completion of the CAD-1 system, it was firstly used for formal drawings for prototype vehicles.
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Effect:Drawing information was transmitted to auto body designers in real time, allowing shortened study times in the early design phase.
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Reference materials:・Nissan Technical Review, Vol. 7, pp. 3-13, 1972
・Proceedings of JSAE Annual Spring Congress, pp. 233-238
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