A Method of Controlling Flow Accuracy of Additive Manufacturing by Predicting Scanning Speed

A technology of additive manufacturing and scanning speed, which is applied in the direction of flow control using electric devices, etc., can solve problems such as difficulty in realization and complex nozzle structure, and achieve the effect of improving wire width accuracy, reducing unnecessary errors, and ensuring stability

Active Publication Date: 2017-02-01
HANGZHOU DIANZI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the complex structure of the nozzle, multiple factors are related to each other, often changing one will bring about changes in other factors, which is difficult to achieve

Method used

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  • A Method of Controlling Flow Accuracy of Additive Manufacturing by Predicting Scanning Speed
  • A Method of Controlling Flow Accuracy of Additive Manufacturing by Predicting Scanning Speed
  • A Method of Controlling Flow Accuracy of Additive Manufacturing by Predicting Scanning Speed

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with accompanying drawing.

[0019] The purpose of the present invention is to avoid the influence of the actual motion trajectory of the nozzle on the wire width accuracy as far as possible, and its technical basis is the mechanical structure of the working platform. The source of the movement speed of the nozzle is the speed synthesis of the two servo motors of the X and Y axes, so the movement of the nozzle is affected by the working characteristics of the servo motor.

[0020] Such as figure 1 As shown, it takes an acceleration time for the motor speed to reach the set n from the initial speed. The motor drives the bearing to rotate to make the nozzle advance in the direction of the X (Y) axis. According to the relationship between the mechanical transmission screw and the lead, the following relationship can be obtained:

[0021]

[0022] Where v is the axial speed, n is the motor speed, P ...

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Abstract

The invention relates to a method for controlling material increase manufacturing flow precision through predicting a scanning speed. According to the method, shaft servo motors are detected, change of an extrusion motor is controlled, a relation between the scanning speed and a discharging speed is established, and unnecessary errors caused by mechanical structures are reduced. Various shaft motors controlling motions of nozzles are equipped with encoders for detecting the motor speed in real time, and whether the speed of the extrusion motor is changed is determined by signals fed back through the encoders to a single-chip microcomputer, so the scanning speed and the discharging speed are guaranteed to be matched constantly, stability of extrusion wire width is guaranteed, and the method improves wire width precision.

Description

technical field [0001] The invention belongs to the field of automatic control, detection technology and rapid prototyping equipment, and specifically relates to adding a closed-loop control related to detection technology to existing rapid prototyping equipment to improve the precision of forming wire width and further improve the precision of formed parts . Background technique [0002] As a typical representative of Additive Manufacturing (AM), Fused Deposition Modeling (FDM for short) is a rapid prototyping technology with broad development prospects at present. It has the advantages of simple process, fast manufacturing speed and convenient raw material acquisition. However, the low accuracy has always been the main reason for the criticism of FDM, which hinders the application and further popularization of FDM in high-precision models. At present, the accuracy improvement of FDM generally has the following directions: [0003] 1. Layer and refine the model. After th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D7/06
Inventor 史廷春何自立
Owner HANGZHOU DIANZI UNIV
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