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Control method of surface waviness of large-size optical element processed through single point diamond milling method

A single-point diamond, surface waviness technology, applied in stone processing tools, stone processing equipment, manufacturing tools, etc., can solve the problems of waviness error, the difficulty of guaranteeing the frequency domain evaluation index PSD1, and achieve reliable results, accurate detection and The effect of control and operation safety

Active Publication Date: 2012-12-26
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the waviness error and the frequency domain evaluation index PSD1 are difficult to guarantee when the existing SPDT method processes large-size optical elements, and provides a single-point diamond milling method for processing the surface waviness of large-size optical elements. Control Method

Method used

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  • Control method of surface waviness of large-size optical element processed through single point diamond milling method
  • Control method of surface waviness of large-size optical element processed through single point diamond milling method
  • Control method of surface waviness of large-size optical element processed through single point diamond milling method

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specific Embodiment approach 1

[0022] Specific implementation mode one: the following combination Figure 1 to Figure 3 This embodiment will be described. The surface waviness control method for processing large-sized optical elements by the single-point diamond milling method described in this embodiment is implemented based on a processing machine tool. The processing machine tool includes a machine base 1, a beam 2, and a connecting bolt 3. The main shaft 4, two columns 5 and three leveling pads 6, two leveling pads are set between the left column 5 and the beam 2, and one leveling pad is set between the right column 5 and the beam 2 6. Each leveling pad 6 has three wedge-shaped spherical supports, the upper surfaces of the three wedge-shaped spherical supports are in contact with the lower surface of the beam 2, and the connection bolts between the leveling pad 6 and the beam 2 3 fixed, the method includes the following steps:

[0023] Step 1: using a processing machine tool to perform the first rough ...

specific Embodiment approach 2

[0039] Specific embodiment two: this embodiment will further explain embodiment one. In step four, increase the average pressure between the beam 2 and the three wedge-shaped spherical supports of the leveling pad body 6 by increasing the pre-tightening force of the connecting bolt 3 , Each time the preload is increased from 30 Newtons to 50 Newtons.

specific Embodiment approach 3

[0040] Specific embodiment three: This embodiment will further explain embodiment one or two. In step five, reduce the gap between the beam 2 and the three wedge-shaped spherical supports of the leveling pad body 6 by reducing the pretightening force of the connecting bolt 3. The average pressure, each reduction of the preload is 30 Newtons to 50 Newtons.

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Abstract

The invention discloses a control method of surface waviness of a large-size optical element processed through a single point diamond milling method and belongs to the field of ultraprecision machining of a large-size brittle optical element. The invention aims to solve the problem that the existing SPDT (single point diamond turning) method cannot guarantee waviness errors and frequency domain evaluation index PSD1 when a large-size optical element is processed. The control method disclosed by the invention comprises the following steps: 1. carrying out rough machining; 2. acquiring a space cycle T of longitudinal strips; 3. judging rigidity of the processing lathe, executing the step 4 if the rigidity is too low and executing the step 5 if the rigidity is too high; 4. increasing average pressure between a beam and a leveling pad body and then executing step 6; 5. reducing average pressure between the beam and the leveling pad body or contact rigidity, and then executing step 6; 6. carrying out secondary ultraprecision machining; 7. detecting the PSD1 value again; 8. judging whether the fact that PSD1 is less than or equal to 15nm<2>.mm is right or false; returning to the step 2 if the fact is false; and if the fact is right, completing the control of the waviness errors and the frequency domain index PSD1 of the large-size optical element U processed through the single point diamond milling method.

Description

technical field [0001] The invention relates to a surface waviness control method for processing large-scale optical elements by a single-point diamond milling method, and belongs to the field of ultra-precision processing of large-scale brittle optical elements. Background technique [0002] The progress of the history of human civilization is largely due to energy. The application of "fossil fuels" such as firewood to coal, oil, and natural gas has made great strides forward in human social and economic construction and living civilization. However, human beings' dependence on "fossil fuels" formed by hundreds of millions of years of deposition has caused an unsustainable energy crisis while promoting the rapid development of society. Combustion of "fossil fuels" is the chief culprit of air pollution, acid rain, greenhouse effect and other ecological damage and environmental pollution. Finding new energy sources has become a top priority for human survival and development...

Claims

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Application Information

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IPC IPC(8): B28D1/18
Inventor 梁迎春陈万群孙雅洲张强刘海涛孙阳陈国达苏浩
Owner HARBIN INST OF TECH