Double nut precision ball screw pair

A ball screw pair and ball screw technology are applied in metal processing mechanical parts, metal processing, metal processing equipment and other directions, which can solve the problems of unsuitable nut rotation driving screw working mode, and achieve reliable axial preload, Axial rigidity and high reliability, the effect of high axial rigidity

Pending Publication Date: 2017-12-22
YUHUAN CNC MACHINE TOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this anti-backlash method is not suitable for the precise and reliable working method of nut rotation driving screw feed from the structural form

Method used

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  • Double nut precision ball screw pair
  • Double nut precision ball screw pair

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Experimental program
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Embodiment Construction

[0025] See figure 1 , the double-nut precision ball screw pair provided by the present invention includes a ball nut and a ball screw 1 that is driven by the ball nut and can only be fed axially. The ball screw 1 is in the cylindrical hole of the above sliding bearing 2 and Axial feed motion is performed on the common reference axis A formed by the cylindrical hole of the lower sliding bearing 8, the upper and lower sliding bearings 2, 8 are fixedly connected with the box body 9, and there are two gaps between the upper sliding bearing 2 and the ball screw 1. A symmetrical flat key (not shown in the figure) to prevent the ball screw 1 from rotating relative to the sliding bearings 2 and 8 when it moves up and down; the ball nut is composed of a main ball nut 4 and an auxiliary ball nut 6, and the ball nut The diameter of the ball 10 in the ball is slightly smaller than the diameter of the ball nut and the upper raceway of the ball screw 1. There is a certain gap between the ma...

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PUM

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Abstract

The invention discloses a double-nut precision ball screw pair, which includes a ball nut and a ball screw supported by upper and lower support parts and driven by the ball nut to rotate and can only perform axial feed. It is composed of a main ball nut and an auxiliary ball nut that are relatively limited but can move relative to each other in the axial direction. The diameter of the ball in the ball nut is slightly smaller than the diameter of the upper raceway of the ball nut and the ball screw. The lower support part is sleeved with a The anti-backlash nut, which can rotate helically relative to the lower supporting part, is in axial contact with the auxiliary ball nut; the main ball nut and the anti-backlash nut are respectively driven to rotate by the driving device. The invention can ensure the high-precision and high-rigidity axial movement of the ball screw along the main design reference axis of the machine tool.

Description

technical field [0001] The invention belongs to a screw pair, in particular to a double-nut precision ball screw pair. Background technique [0002] The working mode of the ball screw pair is that the nut rotates to drive the screw to move axially (the screw does not rotate). Large diameter ball screws (see figure 1 ), the outer diameter of the screw rod is ≥Ф120mm, and it is generally a hollow structure, which contains a set of independent rotating spindle mechanism (not shown in the figure). Due to the large diameter of the screw rod, the outer cylindrical surface of the screw rod itself is a sliding guide rail, so the precision of the axial feed motion of the cylindrical surface of the screw rod is very high. The axial cutting force F of the screw rod fluctuates greatly with the wear of the tool (grinding tool), the change of the feed rate of the tool and the workpiece, and the change of the area of ​​the cutting area. Under this working condition, in order to ensure t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q5/40B23Q5/56
CPCB23Q5/40B23Q5/56
Inventor 许亮彭关清张少军
Owner YUHUAN CNC MACHINE TOOL
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