Screw bearing in order to adapt to a variety of purposes, provides a standardized a wide variety of products.
The ball circulation way of circulation duct type, circulator type, cover type.
The ball screw bearing how should choose?
When the choice should pay attention to what?
Selection should consider factors: 1, to determine diameter load, the output torque of motor performance parameters, if still take reducer will count in (
Consider rate)
, how much thrust calculation under practical conditions, ball screw bearing samples (
And manufacturers to)
Have the load parameters (
Parameters, namely thrust labeling for dynamic load and static load, see the former)
To select the nominal diameter of ball screw bearing.
2, speed and rotating speed in a straight line to determine the ball screw lead.
Motor will know that the output speed is determined, consider the line speed, you need the motor speed,
If divided by reduction ratio with gear box)
Lead the value is multiplied by the screw linear velocity, this value is greater than the need to value.
3, to the actual need to determine the ball screw length (
Working travel length = + + nut length Ann allowance + + installation length + connection length allowance.
If increased protection, such as sheath, need the sheath expansion ratio (
As is 1:8, namely sheath divided by large elongation of 8)
Taken into account.
4, to the actual need to determine the accuracy of ball screw.
A mechanical C7 below, nc machine tools anthology of C5 more (
As a standard in the corresponding is the P5 ~ P4 and P4 P3, specific see sample)
。
5, to install the condition and size structure determine the ball screw nut form (
Nut has a lot of structure, different nut structure size is slightly different, as the case selection, recommend don't choose too different, something wrong with maintenance in a slam shut)
。
6, inquire about the price of the selected products manufacturer, payment terms and time of delivery.
That designers don't think that is a matter of purchasing, in fact many manufacturers (
Import to produce a sample)
Samples of the products on some models it does not produce or don't pick up small orders, printed presumably to show I'm a giant, omnipotent.
Don't wait for you to pick up out of the figure of other parts according to the models start to make the parts to buy when somebody else tell you this model delivery time need 3, 4 months is finished.
7, choosing installation (
Department)
。
This installation can be their own design, also can buy off-the-peg, there is a standard installation is optional.
Design pay attention to the stress state, 7000 or 3000 series bearing good choice, because screw work mainly by the axial force, the radial force will try to avoid.
8, consider guide and installation capacity.
And orientation of form a complete set of ball screw selection ball linear guide, of course straight axis and the collocation of linear bearing is relative economic choice.
Ball screw pair has the points, such as high accuracy, reversibility and high rate of the progress of the trapezoidal screw extension and development, the significance of the development is the trapezoidal screw sliding action into a rolling action.
Because of the very small friction resistance, ball screw bearing is widely used in all kinds of industrial equipment and precision instruments, about screw bearing related content want to know more about it, you can inquire.
Tags: screw bearing selection
