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Ball screw pair with automatic compensation of thermal deformation

A ball screw pair, ball screw technology, applied in the direction of transmission, belt/chain/gear, mechanical equipment, etc., to achieve the effect of improving accuracy and stability

Inactive Publication Date: 2017-06-13
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing technology, there is no ball screw pair that can automatically compensate for thermal deformation

Method used

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  • Ball screw pair with automatic compensation of thermal deformation
  • Ball screw pair with automatic compensation of thermal deformation

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The following is attached Figure 1-2 , to further describe the device.

[0013] Step 1: Drill a through hole along the axial direction of the ball screw body 1.

[0014] Step 2: Arrange the aramid fiber 2 in the axial direction of the inner wall of the through hole, the aramid fiber 2 and the ball screw body 1 are bonded by the adhesive 3, and at the same time, make the length direction of the aramid fiber 2 and the through hole Axially consistent.

[0015] Step 3: Install the nut on the screw shaft of the ball screw body 1.

[0016] The lead screw expands when heated in the axial direction. Because the aramid fiber has a negative thermal expansion coefficient in the length direction, it shrinks when heated, and has a "pull back" effect on the lead screw in the axial direction, so that the thermal deformation of the lead screw is obtained. Automatic compensation.

[0017] A through hole is drilled in the axial direction of the ball screw body 1, and aramid fiber is...

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Abstract

The invention discloses a ball screw pair with automatic compensation of thermal deformation, and belongs to the field of advanced manufacturing. A ball screw body and aramid fibers are pasted together through adhesive. A through hole is drilled in the axial direction of a screw shaft of the ball screw body, the aramid fibers are pasted to the wall of the through hole through adhesive, and therefore the direction of the aramid fibers is kept consistent with the axial direction of the ball screw body. By the adoption of fiber materials with a minus thermal expansion coefficient, the ball screw pair and the screw shaft are both heated, then the ball screw pair automatically obstructs axial expansion of the screw shaft, can compensate for errors caused by thermal expansion of the screw shaft in a self-adaptation mode without a control device, and therefore the precision stability of the ball screw pair is improved. Although holing in the screw shaft will influence the bending rigidity and axial rigidity of the ball screw pair, the aramid fibers in the axial direction will improve the bending rigidity and axial rigidity of the ball screw pair due to the fact that the elasticity modulus of the aramid fibers is large, and the rigidity will not be affected.

Description

technical field [0001] The invention relates to a ball screw pair for automatically compensating thermal deformation, which belongs to the field of advanced manufacturing. Background technique [0002] With the wide application of high-speed processing technology, the linear speed of the ball screw pair is getting higher and higher, and the current linear speed can reach 90-120m / min. During operation, due to the high-speed relative motion of the ball screw pair and the bearing balls and the raceway, the frictional force generates a lot of heat, resulting in thermal deformation of the ball screw pair and resulting in machining errors. [0003] Studies have shown that thermal deformation errors account for about 30% to 50% of the total errors. In precision machining this ratio can be as high as 70%. For the ball screw pair, the main concern in engineering is the axial deformation of the screw at the nut position. Therefore, it is necessary to design a ball screw pair that c...

Claims

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Application Information

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IPC IPC(8): F16H25/22
Inventor 高相胜秦泽云王民
Owner BEIJING UNIV OF TECH
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