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App. B—Commissioned Background Papers

Daiwa Securities America Inc.

Page -23-

TABLE 14

Arc Welding

18. 8%

26. O%

Spot Welding

57.1

45. 1

Spray Painting

11.3

17.8

Others

12.8

11.1

Breakdown of Playback Robot by Work Process

(4/1/80 - 10/1/80)

Unit

Value

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%

respectively.

The large growth

of electronic parts compared to 1979) .

into

printed

in assembly robots was mainly for circuit boards (an increase of 440%

insertion in 1980

SPOT WELDING

The automobile industry has until 1980 been the largest single con-

sumer of robot production, in large measure because of its purchases

of

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-

declined.

Large

monetary

expenditures

to

modify

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.

where Often

to weld in merely one

the new

model in

hour is

required

because they the event of for the new

only a

learning process.

As

it

became

quite

risky

production volume is no longer clearly predictable, to invest in special purpose automatic machines.

  • ‚óŹ

    49

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