Bearing pre-tightening method for large-through-hole headstock mandrel
A bedside box and large through-hole technology, which is applied to the accessories of tool holders, large fixed members, turning equipment, etc., can solve the problems of excessive precision and unreliable positioning of the spindle of the machine tool bedside box, and achieve the effect of stable precision
Active Publication Date: 2020-01-07
德州普利森机床有限公司
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Problems solved by technology
[0003] In order to solve the above problems, the present invention provides a bearing pre-tightening method for the main shaft of the bed head box with a large through hole, which is simple, accurate, and easy to operate, and solves the problem of unreliable positioning of the head box main shaft of the machine tool in the head box due to bearing gaps and excessive precision. Poor phenomenon
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[0030] The present invention will be further explained below in conjunction with the accompanying drawings.
[0031] In the existing bedside box 1, the internal bearing preload is to adjust the preload of the main shaft bearing with a large through hole, but the front gland lock nut 4 and the rear gland lock nut 15 are back-tightened and close to the inner ring of the bearing. At this time, the force At the outer diameter of the nut, the bearing preload is realized by the jacking force formed by the rotation of the nut. In this method, the preload force of the inner ring of the bearing is small, and the purpose of bearing preload cannot be achieved, and because the space of the bearing chamber is small, it is impossible to detect the bearing preload. tight situation.
[0032] The front bearing 3 in the bedside box 1 described in this embodiment is a double-row cylindrical roller bearing NNU4894K P5, and the rear bearing 13 is a double-row tapered roller bearing and 351984 P5. ...
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The invention relates to a machine tool mounting technology, in particular to a bearing pre-tightening method for a large-through-hole headstock mandrel. The method comprises the following steps that(S1) the axial displacement difference delta H1 of a bearing inner ring of a front bearing under the working conditions that the load exists and no load exists is measured; (S2) the axial displacementdifference delta H2 of a bearing inner ring of a rear bearing under the working conditions that the load exists and no load exists is measured; and (S3) the front bearing and the rear bearing are pre-tightened and assembled to the front end and the rear end of the mandrel respectively, and it is guaranteed that before and after pre-tightening, the axial displacement difference of the bearing inner ring of the front bearing is delta H1 and the axial displacement difference of the bearing inner ring of the rear bearing is delta H2. According to the method, the pre-tightening force on the bearings of the large-through-hole mandrel is effectively adjusted, and especially under the heavy load condition, the mandrel precision is stable and reliable.
Description
technical field [0001] The invention relates to machine tool installation technology, in particular to a bearing pre-tightening method for a headstock main shaft with a large through hole. Background technique [0002] In the assembly of the main shaft of the headstock of the large through-hole machine tool, because the workpiece passes through the main shaft hole, the inner hole of the main shaft is relatively large, and the bearing used to fix the main shaft is also enlarged. In order to prevent the unbalanced torque generated by the gap between the inner and outer rings of the bearing when the main shaft rotates, which will affect the stability and rotation accuracy of the main shaft rotation, refer to figure 1 and figure 2 , Double-row cylindrical roller bearings (such as NNU4984K P5) are often used to control the radial runout of the main shaft, and double-row tapered roller bearings (such as 351984 P5) are used to limit the axial movement of the main shaft, so as to ...
Claims
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IPC IPC(8): B23B19/00B23B25/00
CPCB23B25/00B23Q1/70
Inventor李革志卢传杰秦春红成占华于洋
Owner德州普利森机床有限公司