App. B—Commissioned Background Papers
Daiwa Securities America Inc.
Breakdown of Playback Robot by Work Process
(4/1/80 - 10/1/80)
It is clear that spot welding represents the major application of the playback robots. A preliminary report on 1980 calendar year robot production revealed that compared to 1979, arc welding robots increased
2 11% in value respectively. (certainly from
and 100% in units, and spot welding robots grew 85% and 100% In addition, assembly robots grew 340% and 33% respectively a low base) , and press and conveying robots 60% and 6%
The large growth
of electronic parts compared to 1979) .
in assembly robots was mainly for circuit boards (an increase of 440%
insertion in 1980
The automobile industry has until 1980 been the largest single con-
sumer of robot production, in large measure because of its purchases
spot welding robots. 300-400 press-formed
The majority of Japanese car bodies parts manufactured from sheet steel
consist of which are
bonded 1960’s duced.
together by 3,000-4,000 spot welds. In the latter half of the special purpose automatic multi-spot welding machines were intro- However, with the tendency to product diversification and the
shorter life spot welders
cycle of car models, the return on investment of the multi-
spot welders were necessitated by model change-over or design modifi-
cation. During and management zation.
the modification, a considerable period of time was lost expenses were consumed for production line reorgani-
Thus, the robots replaced the multi-spot welders
require being taught model change-over.
to weld in merely one
because they the event of for the new
production volume is no longer clearly predictable, to invest in special purpose automatic machines.