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Speed changing continuous liquid surface manufacturing method and device based on mask image gray level adjustment

A mask image and grayscale technology, applied in manufacturing auxiliary devices, manufacturing tools, additive manufacturing, etc., can solve the problems of inability to achieve real-time adjustment of current and increase costs, and achieve the effect of reducing equipment costs and ensuring dimensional accuracy

Active Publication Date: 2018-08-10
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to adjust the light intensity, in the Chinese patent document (application number 201480008364) is to adjust the current through PWM (pulse width modulation) to achieve the purpose of adjusting the light intensity, the additional hardware projector cost is added here, and it cannot be achieved The purpose of real-time current adjustment

Method used

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  • Speed changing continuous liquid surface manufacturing method and device based on mask image gray level adjustment
  • Speed changing continuous liquid surface manufacturing method and device based on mask image gray level adjustment
  • Speed changing continuous liquid surface manufacturing method and device based on mask image gray level adjustment

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Experimental program
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Effect test

Embodiment 1

[0063] This embodiment discloses a variable-speed continuous liquid surface manufacturing and processing file generation method based on mask image grayscale adjustment, as shown in the attached figure 1 shown, including the following steps:

[0064] Step 1) determine the relationship between the forming base climbing speed and irradiance;

[0065] The determination of the relationship between the climbing speed of the forming base and the irradiance can be obtained by approximating the relationship between the climbing speed and the irradiance of the resin base through existing theories; or the relationship between the two can be obtained through testing.

[0066] Theoretical derivation: In order to understand the relationship between variables more intuitively, as attached figure 2 shown.

[0067] Irradiance (E k ) refers to the radiant flux projected on a unit area, and its unit is also watts per square meter [W / m 2 ].

[0068]

[0069] as attached figure 2 As sh...

Embodiment 2

[0117] The purpose of this embodiment is to provide a device for processing using the processing file in Embodiment 1.

[0118] In order to achieve the above purpose, this embodiment proposes a variable-speed continuous liquid level manufacturing device based on mask image grayscale adjustment, as shown in the attached Figure 9 , including: upper computer 1, electromechanical control board 2, linear slide table 3, double-layer resin plate 4, motor 5, beam 6, forming base 7, parts being processed 8, oxygen supply device 9, oxygen pressure reducing valve 10 , Electromagnetic control valve 11, DLP projector 12, horizontal desktop 13, motor and other structures and components.

[0119] The combined relationship of each part is that the motor 5 and the linear sliding table 3 are directly connected through a shaft coupling, and the linear sliding table 3 is driven to move so as to drive the part forming base 7 to move up and down. The industrial computer or PC is used as the upper...

Embodiment 3

[0122] The purpose of this embodiment is to provide a printing method using the continuous liquid surface manufacturing device described in Embodiment 2.

[0123] In order to achieve the above purpose, this embodiment provides a method for realizing the continuous liquid level manufacturing device as described in Embodiment 2, as shown in the attached Figure 10 shown, including the following steps:

[0124] Step 1): Preparations

[0125] Step 1.1 Adjust the oxygen to the set pressure, supply air to the lower part of the resin tray, ventilate for a period of time, and exhaust the air in the lower part of the resin tray.

[0126] Step 1.2 Adjust the projected light irradiance to the maximum light intensity value required during printing. (The value obtained when projecting a full white mask image with a grayscale of 255)

[0127] Step 2): Load the processing file containing the planned speed, pre-added gray value and exposure time, start processing, and return the part formi...

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Abstract

The invention discloses a speed changing continuous liquid surface manufacturing method and device based on mask image gray level adjustment. The method and the device are conducted on the basis of aprocessing file. A processing file generation method comprises the steps that the forming base motion speed and irradiance relation is determined according to an existing theory or the test; the motion speed corresponding to each layer of slice of a model is determined on the basis of model data; the mask image gray level and irradiance relation is obtained through the test; according to the motion speed and irradiance relation, the motion speed corresponding to each layer of slice and the mask image gray level and irradiance relation, the pre-added gray level value and exposure time needed during each-layer slice machining are obtained; and according to the forming base motion speed, the pre-added gray level value and the exposure time during each-layer slice machining, the model processing file is generated. According to the speed changing continuous liquid surface manufacturing method and device based on mask image gray level adjustment, light intensity changes are achieved throughmask image gray level treatment, accordingly contradictions between resin flowing and resin curing performance are avoided, and the machining precision is guaranteed to the maximum degree under the situation that precision is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing and 3D printing, and in particular relates to a variable-speed continuous liquid surface manufacturing method and device based on mask image gray scale adjustment. Background technique [0002] There are two important defects in the MIP-SLA surface exposure printing technology based on layer accumulation, the construction rate and the built workpiece are not isotropic. For the MIP-SLA surface exposure forming process, there is a contradiction between the layer thickness of the same built part and the vertical resolution of the part. The thinner the layer is cut, the smaller the step effect and the higher the surface quality, but the processing time is greatly increased . In the Z-axis direction, the workpiece formed by MIP-SLA surface exposure is bonded layer by layer through the incomplete curing of the resin. Poor bonding causes its Z-axis mechanical properties to be far lower th...

Claims

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Application Information

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IPC IPC(8): B29C64/124B29C64/20B29C64/386B29C64/393B33Y10/00B33Y30/00B33Y50/00B33Y50/02
CPCB29C64/124B29C64/20B29C64/386B29C64/393B33Y10/00B33Y30/00B33Y50/00B33Y50/02
Inventor 张承瑞李仕浩王鹏胡天亮潘鹏鹏
Owner SHANDONG UNIV