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Extraction method of load spectrum of ball screw pair

An extraction method and ball screw pair technology, applied in the field of contact mechanics, can solve the problems of no method for determining the load spectrum of the screw nut pair, difficulty in testing the load spectrum of the screw nut pair, etc.

Active Publication Date: 2017-11-17
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to test the load spectrum of the screw nut pair, not only the load changes during the working process of the machine tool, but also changes with the assembly quality and lubrication conditions
Therefore, so far there is no method for determining the load spectrum of the lead screw nut pair

Method used

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  • Extraction method of load spectrum of ball screw pair
  • Extraction method of load spectrum of ball screw pair
  • Extraction method of load spectrum of ball screw pair

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0117] After the model is established according to the above steps 1 and 2, the step 3 specifically includes the following contents:

[0118] The structural parameters of the ball screw are as follows:

[0119] Structural parameters of two different ball screw pairs

[0120]

[0121] The flow chart of solving the nonlinear equations of the single ball model contact load by using MATLAB is as follows: Figure 4 As shown, the calculation results of the semi-lead model and the load distribution characteristics of the single ball model are as follows: Figure 5 shown.

[0122] The step 4,

[0123] Step 4-1. When the ball screw is running at high speed, make the following assumptions about the contact characteristics between the ball and the raceway:

[0124] (1) The ball does not slip with the inner and outer raceways during the movement;

[0125] (2) The contact between the ball and the inner and outer raceways is point contact.

[0126] Considering that the ball i bears...

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Abstract

The invention belongs to the field of contact mechanics and relates to an extraction method of a load spectrum of a ball screw pair. The method comprises the following steps: setting up a load distribution model of a single-nut ball screw pair; setting up a nonlinear system of equations for load distribution of the single-nut ball screw pair based on a hertz contact theory according to the principle of deformation compatibility; solving the nonlinear system of equations for contact load of a single-ball model; setting up a solving model for dynamic contact characters of high-speed motion state of the ball screw pair and solving value of the nonlinear system of equations; calculating the change rule between contact load of the screw nut pair and positions based on relations of working positions and torque current of a servo motor with time; and working out the load spectrum of the ball screw pair. The extraction method of the load spectrum of the ball screw pair utilizes precisely-determined load spectrums of all components of the screw nut pair to provide reference for reliability design of a feeding system.

Description

technical field [0001] The invention belongs to the field of contact mechanics and relates to a load spectrum extraction method of a ball screw. Background technique [0002] With the development of modern machinery manufacturing technology towards intelligence, flexibility, integration and high automation, it is required that CNC machine tools can still maintain the characteristics of high precision, low noise, high reliability and long life under the condition of high speed and heavy load . Ball screw pair is one of the key functional parts of CNC machine tools, and its contact mechanical characteristics largely determine the performance of CNC machine tools. When the ball screw pair is running at high speed, the machining accuracy, reliability and life will be reduced due to the frictional heating and contact deformation of the joint surface, which makes the research on the contact mechanical characteristics of the ball screw pair particularly important. [0003] The ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2111/08G06F2119/06
Inventor 赵春雨闫铭徐文才于洪亮张义民
Owner NORTHEASTERN UNIV
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