AIA/NAS 974-2012 pdf download ELECTRICAL HARNESS ASSEMBLING MACHINE, NUMERICALLY CONTROLLED
Purpose
This specification provides a standard for the manufactureperformance，reliability,inspection,and procurement of aseries of standard resistance spot welding machines。 Thisstandard lists minimum requirements and is not to limitdesign advances.
1.2 Classification
The machines shall be of the following type, sizes, and classes.
1.2.1 Type
Press
1.2.2 Size
1.2.3 0CfS
1.3 Class
Standard
Intended Use
The machines described by this specification are intended foruse within the aerospace industry for efficiently producingoptimum quality spot welds on ferrous and non-ferrous alloys.
2.0 APPLICABLE SPECIFICATIONSCODES，AND STANDARDS
The latest revision of the following specifications,codes,and standardsare included as a portion of this specification.Detail requirements ofthis specification shall override any contradictory portions of thefollowing specifications， codes，and standards.
American Welding Society (AWS) Standards.Resistance Welding Manufacturer’s Association (RWMA)Standards。(3.2
Electronic Industries Association (EIA) Standards for(3.3.2)Electronic Wiring and Components.
The Joint Industrial Council (JIC) Hydraulic and PneumaticStandards for Industrial Equipment。(3.6)
National Electrical Manufacturer’s Association (NEMA)Standards。(3.5
American Society of Mechanical Engineers (ASME)Boilerand Pressure Vessel Code，Section VIII。(3.10)
Military Specification MIL-W-6858 Welding Resistance:Aluminum，Magnesium，Non-Hardening Steels or AlloysNickel Alloys，Heat Resisting Alloys，and Titanium;Spot and Seam。(3.2) (4.1)
National Aerospace Standard (NAS) 938，Machine Axisand Motion Nomenclature。(3.32.5
National Aerospace Standard 953，Numerical Control Systems(Reference Only)。(3.3.2.5)
National Aerospace Standard 955，Interchangeable PerforatedTape Standards Variable Block Format for NumericallyControlled Equipment.(3.3.2.5)
National Electrical Code (NEC)。(3.5)
Occupational Safety and Health Standards，Part 19l0 ofChapter XVII of Title 29 of the Code of Federal Regulations.Reference:Occupational Safety and Health Act (OSHA) -1970。(3.8)
State and Local Safety and Electrical Codes。(3.5) (3.8)
3.1.1 All perts shall be constructed such that longevity andeasy maintenance are assured.The frame and base ofthe machine shall be rigid box construction, sufficientlybraced to maintain original alignment。 Acoess to theinterior shall be provided to permit making adjustmentsand repairs to the equipment.
3.1.2The machine shall be furnished complete with all airwater， electrical controls suitable for operation froma 90 psig air supply，30 to 40 psig water supply and460 volts (+ 10%) 3-phase60-hertz electrical supply
Machine Sub-Assemblies
3.3.1 Force System
The force system shall be capable of applying constant andvariable forces and shall,at the option of the customer，bea low inertia pneumatic frictionless diaphragm(s) 8ystem oran electro magnetic syetem。 The pneumatic system，whenspecified，shall be capable of providing and maintainingconsistent and resettable forces within plus or minus 1% ofthe set force, over the entire force range, at all electrodespacings within the working stroke with a supply pressure of+ 20% of the nominal in-plant air pressure specified by thecustomer
The force system shall be capable of producing the followingforce applications – Constant Low，Constant Eigh,and VariableForce.
The variable force equence shall consist of squeeze，weldforce and forge force. The squeeze force may equal theforge force
The ratio between weld and forge forces shall be continuouslyadjustable within the limits of the machine.
AIA/NAS 974-2012 pdf download
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