Duff-Norton KUM2803 설치, 작동 및 유지보수 지침 - 페이지 7

{카테고리_이름} Duff-Norton KUM2803에 대한 설치, 작동 및 유지보수 지침을 온라인으로 검색하거나 PDF를 다운로드하세요. Duff-Norton KUM2803 16 페이지. Rotating ball screw actuators

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2-1. Lubrication

Unless otherwise specified, actuators are

shipped packed with grease which should be suffi-

cient for one month of normal operation. For normal

operation the actuator should be lubricated once a

month, using Extreme Pressure grease Shell Oil Co.

Shell Albida LC EP #2 (Shell Product Code 70311).

This grease has been thoroughly evaluated in

Duff-Norton actuators and has demonstrated supe-

rior lubricating properties affecting both wear life

and maximum duty cycle. Duff-Norton is not aware

of an equivalent grease. If this grease is not

available in your area please contact your local

supplier for their recommendations. Greases con-

taining molybdenum disulfide should never be used.

For severe service conditions, the actuators

should be lubricated more frequently using the

above grease (daily to weekly depending on condi-

tions). If duty is heavy, an automatic lubrication

system is strongly recommended.

For most applications periodically lubricate the

rotating ball screws with a cloth dampened with a

good grade 10W30 oil. An instrument grade oil

should be used in dirty and heavy dust environ-

ments, while bearing grease is recommended for

operating environments at extremely high tempera-

tures. Extremes of temperature and other environ-

mental conditions should be referred to Duff-Norton

for recommended lubrication procedures.

Caution

Where the screw is not protected from

airborne dirt, dust, etc., do not leave a heavy

film of lubricant on the screw. Keep the ball

screw barely damp with the lubricant. Inspect at

regular intervals to be certain a lubricating film

is present. Ball screws should never be run dry.

2-2. Rebuild Procedure

Duff-Norton recommends the following proce-

dures for assembly and disassembly of actuators.

1. Tag critical parts to facilitate reassembly.

2. Mark all mating surfaces to ensure proper

meshing.

3. Clean and lubricate all parts as required.

4. All seals must be replaced when rebuilding.

5. All screws, washers and other small common

parts must be replaced if damaged in any way.

6. Replace damaged or frozen lubrication fittings

with new ones.

Section II

Maintenance

2-3. Required Tools

A bearing puller and press, soft jaw table clamp

and common hand tools are necessary for proper

assembly and disassembly.

2-4. Disassembly

Refer to Figure 3-1. When a numerical index

number is referred to, the reference is to Figure 3-1.

Disassembly should be accomplished on a clean

cloth.

1. Disassembly Inspection (Refer to Figure 3-1). To

determine the need for replacement of the ball

screw (5) or the lifting nut (24) the following

inspection should be made prior to disassembly

of the lifting nut from the ball screw: Inspect the

lifting nut assembly (24) and ball screw (5) as

follows:

a. Lubricate the lifting nut assembly and ball

screw . See paragraph 2-1.

b. Inspect the ball screw grooves for signs of

excessive wear, pitting, gouges, corrosions,

spalling or brinelling. It is usually less expen-

sive to replace the ball screw when any of

the above conditions exist. If you feel, how-

ever, that it can be reworked, return it to

Duff-Norton for final evaluation.

c. If none of the above conditions exist, check

backlash. Secure the ball screw in a table

clamp or similar fixture. Make sure that the

screw shaft cannot rotate. Push firmly on the

lifting nut assembly, first in one direction and

then in the opposite direction. This axial

movement of the lifting nut assembly is the

backlash. While making sure that neither

member rotates, measure the backlash with

a dial indicator.

Measure backlash at points of maximum

usage. Backlash of .001˝ to .010˝ is accept-

able.

d. If the backlash is over .010˝ and the ball

screw appears usable, replace ball nut.

2. Disassembly of Lifting Nut (24) From Ball Screw

(5) (Refer to Figure 2-2).

a. Refer to Table 2-1 and select a tubular arbor

with an I.D. slightly larger than the screw

pilot diameter. The arbor O.D. should allow it

to slide into the lifting nut between the screw

and the bearing balls. The arbor should be

Note