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Precision compensation method for pen type graph plotter based on error field

A technology of error compensation and precision compensation, applied in the field of pen plotter precision compensation based on the error field, can solve problems such as inability to provide precision correction effectively

Inactive Publication Date: 2009-09-30
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to overcome the deficiency that the prior art cannot effectively provide precision correction, the present invention provides a correction method for a pen plotter, which can effectively correct the drawing errors caused by the aging of the pen plotter and the temperature difference in the working environment, ensure the quality of the drawing, and greatly extend the The service life of the plotter significantly improves the utilization efficiency of the equipment, saves money, and ensures the smooth progress of production

Method used

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  • Precision compensation method for pen type graph plotter based on error field
  • Precision compensation method for pen type graph plotter based on error field
  • Precision compensation method for pen type graph plotter based on error field

Examples

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Embodiment Construction

[0089] Now take drawing a rectangle as an example to illustrate the specific implementation of the method. The parameters in this example are set as follows:

[0090] Plotter model: TDM-2070-NMX plotter

[0091] Table length: P = 7000mm

[0092] Table width: Q=2000mm

[0093] Calibration temperature T: 23 degrees Celsius;

[0094] ex=20mm, ey=5mm

[0095] Working environment temperature t: 21 degrees Celsius

[0096] Table expansion coefficient: α=11.70×10 -6 mm / °C;

[0097] In this example, the drawing number of the drawing is A4, the step parameter dx in the x-axis direction is 30mm, the number of sampling times in the x-axis direction is u=234 times, the stepping parameter dy in the y-axis direction is 30mm, and the number of sampling times in the y-axis direction is v=112 times .

[0098] 1. Basic data input for error field construction

[0099] In this example, the data format in the error data file of each axis finally obtained by the laser calibrator is .

[0...

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Abstract

The invention discloses a precision compensation method for a pen type graph plotter based on an error field. The method comprises the following steps: basic data of a structure of the error field is input through a calibration graph plotter, and an error distribution field of a working table of the graph plotter is constructed; all the geometric graph elements needed to be drawn are extracted to determine the size of a mapsheet, and one drawing work area which can contain all the graph elements is selected according to distribution of the error field to ensure that error distribution at the position is the least; according to a starting point, an end point and the geometric graph of each graph element, error compensation is respectively carried out, a deformation error of the working table generated by temperature difference between field temperature and calibration temperature is comprehensively considered to carry out temperature compensation at the same time; and subsequent format conversion and drawing plotting are carried out on a file after being compensated twice. The invention basically eliminates influence of aging of the graph plotter and working field temperature to the drawing accuracy, enhances the drawing efficiency of the graph plotter, prolongs the service life of the graph plotter, and reduces the maintenance cost and the repair cost of the graph plotter.

Description

technical field [0001] The invention relates to an accuracy compensation method for a pen plotter. Background technique [0002] The positioning accuracy of the pen plotter is the main performance index that affects the drawing accuracy. However, during use, as the plotter ages, the plotting accuracy will gradually decrease, and the resulting error will exceed the allowable range. Moreover, the air temperature in the drawing machine room will also affect the drawing accuracy, and the resulting error will exceed the acceptable range. [0003] In view of the decline in accuracy, laser interferometers are currently used to calibrate the plotter. However, the results show that the positioning accuracy of the full working stroke is still greater than the index value. The correction process only adjusts the error from the negative axis to the positive axis, and the total value of the error does not change. It cannot fundamentally solve the problem of decreased positioning accu...

Claims

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Application Information

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IPC IPC(8): B43L13/00
Inventor 常智勇莫蓉孙惠斌万能王增强吴双郭志明
Owner NORTHWESTERN POLYTECHNICAL UNIV
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