Yarn reduction and yarn addition method of three-dimensional variable cross-sectional area braided preform based on active yarn carrier
A technology of three-dimensional weaving and prefabrication, which is applied in the directions of woven fabrics, textiles and papermaking, etc., can solve the problem that the overall thickness of the prefabricated parts is consistent, it is difficult to realize the yarn adding operation, and the uniformity of the yarn arrangement at the yarn subtraction point is difficult to control. and other problems, to achieve the effect of reducing machine steps and simplifying the process of yarn reduction and yarn addition
Active Publication Date: 2015-09-30
WUHAN TEXTILE UNIV
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Problems solved by technology
However, it is difficult to achieve consistent overall thickness of the prefabricated part in this yarn adding and reducing process, and it is not easy to control the uniformity of the yarn arrangement at the yarn reducing point, and it is necessary to set a reference plane, so it is difficult to realize the prefabrication of three-dimensional weaving. Yarn adding operation when the cross-sectional area of the piece is larger than the reference plane
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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[0056] by Figure 9 This typical three-dimensional cross-section braided prefabricated part is illustrated as an example. This prefabricated part can be regarded as two cones superimposed on each other. Increases uniformly until the end face has the same cross-sectional area as the start face.
[0057] In the computer preprocessing stage of the three-dimensional braided prefabricated part, the cross-sectional area of the reduced yarn and the cross-sectional area of the added yarn can be selected according to the change law of the cross-sectional area of the prefabricated part. The ratio of the cross-sectional area S' of the cone to the area S of the base is equal to the square of the ratio of the height h' from the cross-sectional area to the apex to the height h of the cone. Considering that the distribution of the weaving yarn in the cross-sectional area is along the perimeter and is related to the thickness of the three-dimensional weaving preform, the weaving yarn d...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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The invention relates to a yarn reducing and adding method for three-dimensional variable-sectional area knitted prefabricated parts, which is developed from driving yarn carriers. The method comprises the following steps: based on a four-step three-dimensional vertical and horizontal knitting process, correspondingly moving the driving yarn carriers arranged on a knitting chassis comprising fixed vertical and horizontal tracks according to the change of the sectional areas of the three-dimensional knitted prefabricated parts; if the sectional areas of the three-dimensional knitted prefabricated parts are reduced, reducing the corresponding numbers of the driving yarn carriers along a closed curve on the edge of a variable-sectional area plane; and if the sectional areas of the three-dimensional knitted prefabricated parts are enlarged, increasing the corresponding numbers of the driving yarn carriers along the closed curve on the edge of the variable-sectional area plane. The method can be used for repeatedly performing the yarn reducing and adding operations of the three-dimensional variable-sectional area knitted prefabricated parts without cutting off yarns, performing net-size knitting on the three-dimensional variable-sectional area prefabricated parts, and keeping uniform radial thicknesses of the three-dimensional knitted prefabricated parts.
Description
technical field [0001] The invention relates to a method for reducing and adding yarns of a three-dimensional variable cross-sectional area braided preform based on an active yarn carrier, specifically, during the preparation process of a three-dimensional variable cross-sectional area prefabricated part, it is arranged on a weaving chassis composed of rows and columns of tracks The method of moving the active yarn carrier according to the change of the cross-sectional area of the three-dimensional braided preform. technical background [0002] The weaving of three-dimensional braided prefabricated parts is a method in which the yarn carriers on the chassis of the three-dimensional braiding machine drive the yarns to move according to certain rules, so that the yarns are intertwined with each other, thereby forming a three-dimensional structure fabric. [0003] The yarn carriers on the chassis of the existing row-column structure of the knitting machine all adopt a passive...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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IPC IPC(8): D04C1/06
Inventor 吴世林李政宁汪峰杨军
Owner WUHAN TEXTILE UNIV