How to use BUN ball screw support unit


The ball screw support is a bearing support for supporting the connecting screw and the motor. The support is generally divided into: fixed side (plus K for example, such as BK12) and support unit (for F, such as BF12). JIS grade 5 angular contact ball bearings.
The ball screw support seat is equipped with an ultra-compact angular contact ball bearing with a contact angle of 45° developed for the ultra-small ball screw, which achieves high rigidity, high precision and stable rotation performance.
The support unit on the support side uses deep groove ball bearings. Supporting units such as EK, BK type internal bearings are filled with an appropriate amount of lithium soap-based grease, sealed with a special sealing gasket, can be directly installed, long-term use.

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(1) Adoption of the best bearing

Considering the rigidity of the ball screw, a high-rigidity, low-torque angular contact ball bearing (contact angle 30°, free combination) is used. At the same time, the ultra-small support units EK6, 8 are equipped with ultra-compact angular contact ball bearings developed for ultra-small ball screws. This bearing has a contact angle of 45°, a small ball diameter and a large number of balls. It is an ultra-small angular contact ball bearing with high rigidity and high precision, which can achieve stable rotation performance.

(2) Shape of the support unit

The support unit is available in angled and round series, depending on the application.

(3) Small and easy to install

The support unit is a small-sized design that takes into consideration the surrounding space. At the same time, the bearing with the adjusted preload is installed, and the assembly can be directly carried out after delivery, which reduces the assembly time and improves the assembly precision.

kind

The main types of ball screw support are

Screw support -FK

Standard support, the same specifications as THK. It is a special support seat on both sides of the ball screw.

2. Heavy load support – WBK

Standard support, the same specifications as NSK. It is a special heavy-duty support for both sides of the ball screw.

3. Nut holder – MGD

Standard nut support for ball screws.

4. Nut holder – MC

Standard nut support for ball screws.

5. Locking nut (RN)

Standard support, the same specifications as THK. It is a special support seat on both sides of the ball screw.

6. Screw support – AK

Standard support, the same specifications as THK. It is a special support seat on both sides of the ball screw.

7. Screw support – EK

Standard support, the same specifications as THK. It is a special support seat on both sides of the ball screw.

8. Screw support – BK

Standard screw support, the same specifications as THK. It is a special support seat on both sides of the ball screw.

installation method:

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Ball screw support structure and installation

◎There are 8 models of the support base. For the shaft end and finished product of the standard ball screw stock, a standardized support base is prepared.

EK, EF, FK, FF type, standard support AK, AF, BK, BF type are prepared for general ball screws.

The fixed side is equipped with JIS grade 5 or P0 angular contact ball bearings which are pre-pressed and adjusted.

A combination of economics.

High precision and stable rotation performance.

◎ Deep groove ball bearings are used on the support side.

◎The inner bearings of the support EK, BK, FK and AK type contain an appropriate amount of lithium soap-based grease with special sealing. and so

These models can be used for a long time.

Installer

Mounting support

(1) Mount the fixed side to the screw.

(2) Insert the fixed side, tighten the lock nut, and fix it with the spacer and the hexagon socket fixing bolt.

(3) The support side bearing is fixed to the screw shaft by a snap ring and is fitted into the support side support seat.

Note 1: Do not disassemble the support unit.

Note 2: When inserting the screw shaft into the support unit, be careful not to turn the flange of the oil seal.

Note 3: When pressing the spacer with the hexagon socket fixing bolt, to prevent looseness, apply the adhesive to the hexagon socket fixing bolt and tighten it.

In addition, when used under severe conditions, measures must be taken to prevent loosening of other parts. For details, please contact HCH Shanghai Hancheng.

Installation on the work bench base

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(1) When using the holder to mount the ball screw nut to the table, insert the nut into the holder and temporarily tighten it.

(2) Temporarily tighten the fixed side to the base.

In this case, move the table closer to the fixed side support unit and align it to the center of the shaft, and adjust the table to make the base move smoothly.

◎ When using the fixed side as a reference, adjust the gap between the ball screw nut and the table or the support.

◎ When using the table as a reference, use a shim to adjust (for the angled support unit) or between the outer surface of the nut and the inner surface of the mounting part.

Leave a certain clearance (for round support) for adjustment.

(3) Close the workbench to the fixed side support unit and align it to the center of the shaft so that the workbench can be reciprocated several times and adjusted to the entire line of the nut.

The process can move smoothly and temporarily tighten the support to the base.

Confirm accuracy and fully tighten the support unit

◎Use the dial gauge to test the swing and axial clearance of the ball screw shaft end, and completely tighten the nut of the ball screw in sequence,

Nut holder, fixed side, support side.

Connection to the motor

(1). Mount the motor mount to the base.

(2). Connect the motor to the ball screw with a coupling. (note the installation accuracy)

(3). Please pay attention to the full test run.