Safety use of ball screw assembly:
Lubrication
In order to sufficiently display the function of
ball screw assembly, it must be lubricated under
its working state, and there are two main lubricating
methods, as follows:
- Lubricating grease
The volume of lubricating grease is usually 1/3
of inner cubage of nut, GB7324-942# lithium lubricating
grease has already injected in the nut when the
ball screw leave factory.
Lubricating oil
Lubricating oil with movement viscidity of 28.5－74cst(400T).
The oil volume is confirmed along with using conditions
(with restrain volume) as well as others. |
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Dustproof
The same as rolling bearing, the ball screw will be
abraded soon if feculence or eyewinker enters it. Considering
this (scrap), it must use dustproof device (pleat protection
cover, ball screw cover, etc.), to completely protect
guide screw shaft.
In addition, if there is floating dust under the condition
that there is not any eyewinker, equip dustproof washer
at the two ends of ball bearing nut.
Use
Following items should be noticed when using ball screw
assembly:
- Ball bearing nut should operate within valid journey,
collocate position limit at the two ends of journey
if necessary to avoid the nut leaving guide screw
shaft to make ball bearing fall off.
- Because the ball screw assembly has high transmission
efficiency but without self-lock ability, when used
in vertical transmission, under the condition that
the weight of components are not balanced, the reversion
caused by deadweight of components must be prevented
after the transmission stops or the electricity of
motor is cut off.
- Normal temperature range of working environment
of ball screw assembly is ±60℃.
- Installation
Following items should be noticed when installing
ball screw assembly:
a. The ball screw assembly
is only used to receive axial load. Radial and
bending moment will make it produce additional
surface contact stress or other loads, so as to
lead to permanent damage to ball screw assembly.
Therefore, when installing ball screw assembly
to machine tool, we should notice following items:
- The axes of screw guide must be parallel with
that of the guide rail, which is matched with it,
the bearing bush seat on the two ends of machine
tool must be on the same line with nut seat;
- When installing nut, approach the supporting
bearing as far as possible;
- When installing supporting bearing, approach
the installation position of nut as far as possible.
- When installing ball screw to machine tool, do
not disassemble nut from guide screw shaft. Use auxiliary
cover if it must be disassembled, or the ball bearing
may fall off when disassembling and assembling. Following
items should be noticed when disassembling and assembling:
- Outer diameter of auxiliary cover should be 0.1-0.2mm
smaller than bottom diameter of guide screw;
- In the course of using, the auxiliary cover must
approach closely to thread shaft collar of guide
screw;
- When disassembling, make sure not to use overlarge
strength to avoid damaging nut;
- Avoid impact and eccentricity when putting in installation
hole.
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