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A Method for Determining Optimal Radial Clearance of Ball Screw Pair

A ball screw pair and radial clearance technology, which is applied in the field of ball screw pairs, can solve the problem of low ball screw assembly pass rate, inability to meet the requirement of ball screw pair lean assembly, performance optimization and efficiency improvement, spiral roller The quality of the precision grinding process is not easy and other problems, to achieve a highly targeted effect

Active Publication Date: 2020-10-16
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The range of the radial clearance value of the ball screw pair is not clearly stipulated in the national standards and industry standards. In actual production, the quality of the precision grinding process of the ball screw pair’s spiral raceway is not easy , the range of the radial clearance of the ball screw pair is relatively wide, so it cannot guarantee to meet the requirements of lean assembly, performance optimization and efficiency improvement of the ball screw pair
Therefore, aiming at the process of fine grinding and then assembling the ball screw pair, it is urgent to establish an optimization method for the best radial clearance to solve the problem of low pass rate of ball screw pair assembly

Method used

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  • A Method for Determining Optimal Radial Clearance of Ball Screw Pair
  • A Method for Determining Optimal Radial Clearance of Ball Screw Pair
  • A Method for Determining Optimal Radial Clearance of Ball Screw Pair

Examples

Experimental program
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Effect test

Embodiment 1

[0050] Such as figure 1 As shown, a method for determining the optimal radial clearance of a ball screw pair includes the following steps:

[0051] (1) Measure the raceway of the processed screw shaft and nut, and determine the screw side raceway contact angle α of the ball screw pair of this batch n , Nut side raceway contact angle α s Variation range; the screw side raceway contact angle α n , Nut side raceway contact angle α s The method to obtain the change range is: use a profiler to measure the α of a batch of screw shafts and nut raceways n and alpha s . The screw side raceway contact angle α n , Nut side raceway contact angle α s The value range of is 38.5°-41.5°.

[0052] (2) Determine the radial clearance S of the ball screw pair according to the internal standards of the enterprise d The optimization interval of the company's internal assembly standard is: the interval of the radial clearance is 0.001mm-0.04mm, and the radial clearance S is set d The initi...

Embodiment 2

[0075] A method for determining the optimal radial clearance of a ball screw pair, comprising the following steps:

[0076] 1, step (1), (2), (3) are the same as embodiment 1,

[0077] 2. Set the radial clearance S of the ball screw pair d 0.01mm respectively, repeat steps (4), (5), (6) in embodiment 1, obtain the error circle under different radial gap conditions, the result is as follows Figure 4 shown.

Embodiment 3

[0079] A method for determining the optimal radial clearance of a ball screw pair, comprising the following steps:

[0080] 1, step (1), (2), (3) are the same as embodiment 1,

[0081] 2. Set the radial clearance S of the ball screw pair d Be respectively 0.04mm, repeat steps (4), (5), (6) in embodiment 1, obtain the error circle under different radial gap conditions, the result is as follows Figure 5 shown.

[0082] The diameters of three error circles obtained by comparative examples 1-3 are respectively 0.6 °, 1.16 °, 0.8 ° (the unit of this diameter is the unit of abscissa or ordinate of the error circle in the contour map), the obtained The value of the radial clearance corresponding to the error circle with the largest diameter is the optimal value of the radial clearance of the ball screw pair; and the contact angle α of the screw side raceway corresponding to the center position of the error circle n , Nut side raceway contact angle α s The optimal value for the n...

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Abstract

METHOD FOR DETERMINING OPTIMAL RADIAL CLEARANCE OF BALL SCREW The present invention belongs to the technical field of ball screw assemblies and particularly relates to a method for determining an optimal radial clearance of a ball screw assembly. The method includes: 1) determining a variation range of a screw-side raceway contact angle and a nut-side raceway contact angle of the ball screw assembly of this batch; 2) determining an optimized range and an initial value of a radial clearance of the ball screw assembly; 3) determining ball radius, screw raceway radius, nut raceway radius and helix angle of the ball screw assembly; 4) calculating to obtain a value of an elastic deformation contact angle corresponding to different screw raceway and nut raceway contact angles; 5) drawing a contour line of the elastic deformation contact angle; 6) drawing an error circle in a contour line map drawn in step 5); 7) respectively setting radial clearances Sd of different ball screw assemblies, drawing an error circle, and comparingdiameters of the error circles. According to the present invention, a theoretical basis and a calculation method are provided for the manufacture and assembly of the precision ball screw assemblies, and a guarantee is provided for increasing the qualification rate of the precision ball screw assemblies and improving the quality of products. Determine a vacation range of a screw-side raceway contact angle and a nut-side raceway contact angle of ball screw assemblies according to an actual machining process iDetermmean optimized range and aninitial value of a radial clearance of the ball screw assembly according to a national standard Determine basic parameters of the ball screw assembly: ball radius, screw raceway radius, nut raceway radius, and helix angle Set the initialvalue of the radial clearance Calculate to obtain a value of an elastic deformation contact angle corresponding to different screw racewa and nut raceway contact angles Reset a value of the radial clearance Draw a contour line of the elastic deformation contact angle Draw an error circej 1 [:.Draw an error circle i Comprehensive comparison Optimal value of the radial clearance

Description

technical field [0001] The invention relates to the technical field of ball screw pairs, in particular to a method capable of determining the optimal radial clearance of a ball screw pair. Background technique [0002] In recent years, the ball screw pair has the advantages of high transmission efficiency, high precision and smooth movement, and has been widely used in CNC machine tools and machinery manufacturing. The processing of precision ball screw pairs often adopts the manufacturing method of grinding the screw raceway and the nut raceway respectively and then assembling them. In this assembly process, the radial clearance of the ball screw pair is an important assembly parameter that affects the performance of the ball screw pair. In the grinding process of the screw and nut raceway, due to the limitation of the grinding process, the grinding result of the spiral raceway section often has a certain error with the ideal result. Therefore, the radial clearance of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B5/14
CPCG01B5/14
Inventor 姜洪奎马建春刘莉许向荣李彦凤宋现春
Owner SHANDONG JIANZHU UNIV
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