Kitagawa BB200 Series, Инструкция по эксплуатации, Страница: 20 / 36

Ex.1
φD'
B
A
φd
φD
φD
φD'
B
A
Ex.2
Protrusion
Pin Bolt and nut
Plate
20 19
１．Preparation of the jig for forming
・Prepare the jig for forming. (There is a commercially available
product.)
・Attach the pin (Example 1) or the bolt and nut (Example 2) by
dividing equally into 3 portions onto the ring shape plate. Make the
ring into a shape with sufficient thickness which does not distort.
２．Gripping of the jig for forming
・Operate the switch valve and maximize the opening of the jaw.
Then, operate the switch valve to insert the jig for forming into the
bolt hole of the soft jaw to grip. At this time, grip by pressing the
ring end surface of the jig for forming onto the jaw so as not to
generate run-out.
・Check that it is gripping almost in the center of the appropriate
stroke.
・Set the hydraulic pressure when forming slightly higher than when
processing the work.
３．Forming
・Process the gripping part (dimension φD') of the work in the state
that the jig for forming is kept gripped. The φD' part is to be
approximately the same diameter (H7) as the diameter of the
gripping part of the work, and process to be surface roughness at
6s or less.
４．Trial cutting
・Remove the jig for forming and grip the work to check the jaw
stroke.
・Implement trial cutting to check the process precision and that
there is no slip, etc.
・Contacting on the gripping surface is to be 2 points contact of the
side A and the side B when gripping.
4−4 Forming method when you use forming jig
１．Preparation of the ring for forming
・Prepare the ring for forming. The surface roughness of the ring
inside diameter is to be approximately 25s, and make a shape
with a sufficient thickness which does not distort.
・It is convenient to prepare various inside diameter dimensions for
dimensions of forming parts.
２．Process of the ring gripping part for forming
・Operate the switch valve and minimize the jaw to close.
・Then, process the φD part (part to grip the ring for forming). Set
the dimension φD so that gripping near the center of the jaw
maximum stroke (diameter) is possible.
・φD = φd - (jaw maximum stroke/2)
３．Gripping of the ring for forming
・By operating the switch valve, grip the ring for forming in the φD
part. At this time, grip by pressing the ring on the jaw in order for
the ring not to be tilted. Repeat chucking several times to stabilize
the ring.
４．Forming
・Process the gripping part (dimension φD') of the work in the state
that the ring is kept gripped. The φD' part is to be approximately
the same diameter (H7) as the diameter of the gripping part of the
work, and process to be surface roughness at 6s or less.
・Set the hydraulic pressure when forming the same as when
processing of the work, or slightly higher. Additionally, in the
case of inside diameter gripping, it is necessary to use the input at
1/2 of the allowable maximum input or less.
・When the ring distorts, lower the hydraulic pressure or change the
ring into a shape which does not easily distort.
５．Trial cutting
・Remove the ring for forming and grip the work to check the jaw
stroke.
・Implement trial cutting to check the process precision and that
there is no slip, etc.
・Contacting on the gripping surface is to be 2 points contact of the
side A and the side B when gripping.
4−3 Forming soft jaw with inside diameter gripping