CN112613135B - Design method for trimming data of titanium alloy corner piece part - Google Patents
Design method for trimming data of titanium alloy corner piece part Download PDFInfo
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- CN112613135B CN112613135B CN202011452463.3A CN202011452463A CN112613135B CN 112613135 B CN112613135 B CN 112613135B CN 202011452463 A CN202011452463 A CN 202011452463A CN 112613135 B CN112613135 B CN 112613135B
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- G06—COMPUTING; CALCULATING OR COUNTING
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- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
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Abstract
The invention relates to a design method for trimming data of a titanium alloy corner piece part, and belongs to the technical field of aircraft manufacturing. A design method for trimming data of a titanium alloy corner piece part comprises the following steps: the method comprises the following steps: selecting a common-mode forming part; selecting a plurality of parts with similar shapes and sizes which can be formed on the same die by measuring a digital model of a titanium alloy angle sheet product; step two: respectively designing trimming data of single parts; step three: arranging the trimming data in a straight line; keeping the relative positions of the web surface and the flanging surface of each common mode unchanged according to the principle of optimal arrangement and material saving of parts; step four: and (7) trimming. The invention has the following advantages: the numerical control cutting machine can be directly used for batch numerical control processing of trimming after the titanium alloy fillet part with small external contour size is formed, greatly facilitates batch trimming operation of the titanium alloy fillet part, greatly shortens the design period of trimming data of the titanium alloy fillet part, and improves the manufacturing efficiency of the titanium alloy fillet part.
Description
Technical Field
The invention relates to a design method for trimming data of a titanium alloy corner piece part, and belongs to the technical field of aircraft manufacturing.
Background
The technological process of hot forming plate part with titanium alloy includes the steps of preparing blank, pre-forming, hot forming, correcting, trimming, surface treatment, etc. The titanium alloy plate part is difficult to cut edge manually due to high hardness, and the edge cutting process needs to be finished by linear cutting, water cutting or laser cutting.
There are a large amount of titanium alloy angle piece parts that are used for the connection structure spare in modern unmanned aerial vehicle, and the biggest appearance overall dimension is less than 40mm, and the part size is little, because titanium alloy panel part thermoforming process is complicated, the cycle is long, with high costs, needs a plurality of parts to take shape jointly, takes shape at last in unified side cut after the shaping. Therefore, the trimming process urgently needs to design a data design method for numerical control trimming.
Disclosure of Invention
The invention aims to provide a method for designing the trimming data of a titanium alloy fillet part, which can ensure the quick trimming of the titanium alloy trimming part, is convenient for the operation of a fitter for cutting the titanium alloy part and improves the working efficiency of the titanium alloy hot-forming plate part processing.
In order to achieve the purpose, the invention adopts the following technical scheme: a design method for trimming data of a titanium alloy corner piece part comprises the following steps:
the method comprises the following steps: selecting a common-mode forming part;
selecting a plurality of parts with similar shapes and sizes which can be formed on the same die by measuring a digital model of a titanium alloy angle sheet product;
step two: respectively designing trimming data of a single part;
step three: arranging the trimming data in a straight line;
keeping the relative positions of the web surface and the flanging surface of each common mode unchanged according to the principle of optimal arrangement and material saving of parts;
step four: and (6) trimming.
Preferably, in step one, the co-formable parts have several common features:
(1) A single-edge-bending titanium alloy corner piece part with a simple appearance and no sinking characteristic;
(2) The difference of the outline dimensions is required to be within 10 mm;
(3) The difference of the bending angles of the parts formed by the same group of common mode is required to be within the range of +/-1 degrees;
(4) The bending radii need to be the same.
Preferably, in the second step, designing trimming data of the single part includes the following steps:
(1) Extracting a part outline from a three-dimensional model of a part product to generate two-dimensional plane data which can be used for numerical control trimming;
(2) The contour lines of the bending side and the web surface are aligned;
(3) And designing a cutter moving line of the contour line of the bending face and the contour line of the web face.
Preferably, in the third step, the web surface and the trimming data of the curved surface are connected end to end by a cutter line, and are linearly arranged to generate the trimming data of the contour line of the curved surface and the trimming data of the contour line of the web surface.
Preferably, in the fourth step, the size of the blanks of the common-mode parts is determined according to the maximum profile of the arranged trimming data, and after the common-mode parts are manufactured and formed, the common-mode parts are transferred to a cutting machine to be fixed for numerical control trimming of the common-mode parts. After the numerical control trimming is finished, local excess materials exist in the positions of the plurality of parts at the edges, and workers can easily cut off and polish the cut surfaces smoothly.
Compared with the prior art, the invention has the following advantages:
the numerical control cutting machine can be directly used for batch numerical control processing of trimming after the titanium alloy fillet part with small external contour size is formed, greatly facilitates batch trimming operation of the titanium alloy fillet part, greatly shortens the design period of trimming data of the titanium alloy fillet part, and improves the manufacturing efficiency of the titanium alloy fillet part.
Drawings
FIG. 1 is a schematic illustration of the components of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a three-dimensional profile extraction line according to an embodiment of the present invention;
FIG. 3 is a schematic view of a trimming data design according to an embodiment of the present invention;
FIG. 4 is a schematic view of a trimming data arrangement according to an embodiment of the present invention;
in the figure, 1, a crimp face; 2. a web face; 3. bending the starting line; 4. a curved surface contour line; 5. the contour line of the web surface.
Detailed Description
The following takes the titanium alloy fillet part model shown in fig. 1 as an example, and with reference to fig. 2 to 4, further illustrates a specific implementation process of the trimming data design of the titanium alloy fillet part:
the method comprises the following steps: selecting common mode forming parts
The parts that can be co-molded must meet several common requirements:
(1) A single-edge-bending titanium alloy corner piece part with a simple appearance and no sinking characteristic;
(2) The difference of the outline dimensions is required to be within 10 mm;
(3) The difference of the bending angles of the parts formed by the same group of common mode is required to be within +/-1 degrees;
(4) The bending radii need to be the same.
Measuring a digital model of the corner piece part in the figure 1, wherein the thickness of the part blank is d, the web plate surface 2 and the bending side surface 1 are planes, the length, the width and the height are respectively L, N and H, the bending angle is 90 degrees, the bending radius is R, and the part blank has complex structural characteristics of single bending side, no sinking and the like; selecting other 5 corner piece parts which can be formed in a co-molding mode from the same batch of parts according to the requirements which can be met by the co-molded parts;
step two: designing trimming data of individual parts separately
The 6 corner piece parts were designed in the following manner:
(1) As shown in fig. 2, in the three-dimensional model of the part product, according to the way that the relative position of the part bending is downward, a bending surface contour line 4 and a web surface contour line 5 of the part starting from a bending start line 3 are extracted, and two-dimensional plane data which can be used for numerical control trimming and is shown in fig. 3 are generated;
(2) As shown in fig. 3, in the two-dimensional CAD model, the bending start lines of the curved surface contour line 4 and the web surface contour line 5 are made parallel and arranged according to the actual relative positions of the parts; aligning two points A and B of the starting end of the curved surface contour line 4 with two points C and D of the starting end of the web surface contour line 5 in the direction vertical to the curved starting line 3 respectively; the distance between the two bending starting lines 3 is adjusted according to the actual size of the part;
(3) As shown in fig. 3, at two points B and D, extending straight outwards along the curve start line, beyond the maximum profile D, to form two cutting lines B-B1 and D-D1; and projecting the E point of the maximum outline of the web surface outline 5 close to the C point onto the extension line of the bending starting line 3 to obtain an E1 point, extending the E1 point outwards along the bending starting line 3 to obtain a C1 point, and finally forming a C-C1 cutter path. And the point C1 is vertically bent to the starting line of the bending surface and projected to the extension line of the starting line of the bending surface to obtain a point A1, and the straight line connects the point A and the point A1 to obtain a cutter-moving line A-A1. The curve start line shown in fig. 3 is indicated by a broken line, and is not used for numerical control machining but is used only as an auxiliary line; the line segment A1-A-B-B1 represented by a solid line is part edge-cutting data of the curved surface; C1-C-D-D1 line segments represented by solid lines are the trimming data of the web surface of the part;
step three: trimming data arrangement
The 6 parts trimming data are uniformly arranged according to the characteristics of the bent edge surface, the web surface and the like of the parts; the bending starting lines 3 of 6 trimming data are kept on a straight line, and the cutter running lines of adjacent parts are directly connected end to end; a certain machining allowance is outwards placed on the periphery of the arranged edge cutting graphs of 6 parts, and the positions of two points A1 and C1 of the feed line ends of the parts arranged at the starting positions are superposed with the positions of the feed line ends B6 and D6 of the last part by allowance lines to be used as a start point and a retreat point of numerical control edge cutting;
step four: edge cutting
After blanking and forming according to the maximum contour, respectively carrying out numerical control trimming according to trimming data of a curved face contour line 4 and trimming data of a web face contour line 5 shown in figure 4, finally manually cutting off five excess material areas such as B-A02-C02-D-B, B02-A03-C03-D02-B02, B03-A04-C04-D03-B03, B04-A05-C05-D04-B04, B05-A06-C06-D05-B05 and the like by workers, and carrying out manual polishing to obtain 5 finished parts.
The above examples are merely preferred embodiments of the present invention and are not to be construed as limiting the invention. It will be understood by those skilled in the art that any extension, equivalent replacement, etc. made without departing from the essence of the present invention shall fall within the protection scope of the present invention.
Claims (4)
1. A method for designing trimming data of a titanium alloy corner piece part is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: selecting a common-mode forming part;
selecting a plurality of parts with similar shapes and sizes which can be formed on the same die by measuring a digital model of a titanium alloy angle sheet product;
step two: respectively designing trimming data of single parts;
step three: arranging the trimming data in a straight line;
keeping the relative positions of the web surface and the flanging surface of each common mode unchanged according to the principle of optimal arrangement and material saving of parts;
step four: trimming;
the co-moldable parts have several common features:
(1) A single-edge-bending titanium alloy corner piece part with a simple appearance and no sinking characteristic;
(2) The difference of the outline dimensions is required to be within 10 mm;
(3) The difference of the bending angles of the parts formed by the same group of common mode is required to be within +/-1 degrees;
(4) The bending radii need to be the same.
2. The method for designing trimming data of a titanium alloy corner piece part according to claim 1, wherein: in the second step, designing trimming data of a single part comprises the following steps:
(1) Extracting a part outline from a three-dimensional model of a part product to generate two-dimensional plane data which can be used for numerical control trimming;
(2) The contour lines of the bending side and the web surface are aligned;
(3) And designing a tool moving line of the contour line of the flanging surface and the contour line of the web plate surface.
3. The method for designing trimming data of a titanium alloy fillet part as set forth in claim 1, wherein: and in the third step, the web surface and the trimming data of the bending surface are connected end to end by a cutter line, and are linearly arranged to generate the trimming data of the contour line of the bending surface and the trimming data of the contour line of the web surface.
4. The method for designing trimming data of a titanium alloy fillet part as set forth in claim 1, wherein: and in the fourth step, determining the size of the blank of the common-mode part according to the maximum outline of the arranged trimming data, and transferring the common-mode part to a cutting machine to fix the common-mode part for numerical control trimming after the common-mode part is manufactured and formed.
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