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Method for determining alternate timing in additive and subtractive composite manufacturing

A technology of adding and subtracting materials and timing, which is applied in the direction of manufacturing tools, automatic control devices, metal processing machinery parts, etc., can solve the problems of inability to guarantee the accessibility of tools, many times of switching between adding and subtracting materials, and low efficiency, so as to shorten the process Make the time, reduce the switching time of adding and subtracting materials, ensure the processing accuracy and the best effect

Active Publication Date: 2020-02-04
DALIAN UNIV OF TECH
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Problems solved by technology

[0007] According to the existing processing method proposed by the above-mentioned prior art, there are many times of switching between adding and subtracting materials, and the efficiency is low. If a large number of fixed layers of adding materials is used, technical problems such as the accessibility of tools for complex contours cannot be guaranteed. A method for determining the timing of alternation in additive-subtractive composite manufacturing

Method used

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  • Method for determining alternate timing in additive and subtractive composite manufacturing
  • Method for determining alternate timing in additive and subtractive composite manufacturing
  • Method for determining alternate timing in additive and subtractive composite manufacturing

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Embodiment 1

[0058] The isometric side view of the specific embodiment of the invention is as attached image 3 As shown in , after pre-identifying the features of the part, it is found that the inner cavity of the part has a large depth-to-width ratio, and contains conical surfaces and curved surface features of various curvatures. way to form.

[0059] The part material of this embodiment is predetermined to be martensitic stainless steel, the laser power is set to 350W, and the scanning speed is 1000mm / s; Figure 4 There are two places in A and B. A is the enlarged diameter, and B is the reduced diameter. The slope of the two contours in the vertical direction changes significantly, so the thickness of the powder layer at A and B should be smaller.

[0060] as attached figure 1 As shown in , first import the 3D model of the part into the NC simulation processing software, and judge that the contour features of the part are mainly slopes and curved surfaces. Figure 5 The forming bal...

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Abstract

The invention provides a method for determining the alternate timing in additive and subtractive composite manufacturing, and relates to the technical field of metal additive and subtractive compositemanufacturing. According to the method, the addictive mode is a powder spreading mode, the subtractive milling mode is three-axis numerical control milling. The method for determining the alternate timing in the additive and subtractive composite manufacturing comprises the following steps of 1, acquiring a tool path; 2, establishing a tool space coordinate model; 3, extracting the density of point cloud of a surface to be machined; 4, carrying out collision analysis; 5, determining an optimal alternating timing; and 6, implementing machining. According to the technical scheme, the problems that in the prior art, an existing machining method is low in efficiency due to more additive and subtractive switch times, and the reachability of a tool with a complex contour cannot be guaranteed due to the fact that a large number of fixed additive layers are adopted.

Description

technical field [0001] The invention relates to the technical field of composite manufacturing of metal additive and subtractive materials, in particular to a method for determining alternate timing in composite manufacturing of additive and subtractive materials. Background technique [0002] Traditional manufacturing methods are difficult to process features such as deep grooves, deep holes, large inflection points, closed cavity structures, and undercut surfaces. However, various emerging additive manufacturing methods have expanded the range of machinable features, among which selective laser melting is especially suitable. It is suitable for processing precision curved surface parts, but the surface of purely additively formed parts generally has defects such as step effect, powder bonding and spheroidization. [0003] By combining the two processes of additive manufacturing and subtractive manufacturing, that is, using alternate forming and processing processes, firstl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23Q15/02
CPCB23Q15/02
Inventor 白倩杜巍高英铭求晓玲乔国文
Owner DALIAN UNIV OF TECH
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