A double-slot mold deflection compensation method

Abstract

The application discloses a double-groove die deflection compensation method, and relates to the technical field of die machining. The double-groove die deflection compensation method draws a first contour curve on a single die, and obtains a first deflection compensation value of a to-be-measured point according to the first contour curve; then a second contour curve is drawn on a double-groove die, and a second deflection compensation value of the to-be-measured point is obtained according to the second contour curve; the first deflection compensation value and the second deflection compensation value of the to-be-measured point are summed to obtain a final deflection compensation value of the to-be-measured point. The final deflection compensation value is related to the deflection deformation of the double-groove die as a whole and the deflection deformation of the single die as a concentrated stress point. The deflection compensation of the double-groove die according to the final deflection compensation value can improve the problem that the deformation deviation of the double-groove die is relatively serious.

Description

Technical Field

[0001] This invention relates to the field of mold processing technology, and in particular to a method for compensating for the deflection of a double-groove mold. Background Technology

[0002] The forming pressure of automotive stamping and drawing dies can reach thousands of tons during operation. The die and the worktable will deflect and deform. The deflection and deformation of the die will cause the upper and lower mold surfaces to be inconsistent and the side walls of the product inside the cavity to interfere. This will result in a large amount of die grinding. Designers often need to compensate for the deflection of the die during and after the die is processed. When performing deflection compensation on a mold, designers often perform deformation compensation on the mold during the mold processing data stage. A common mold compensation method is to first select the center point of the mold as the starting point, and then draw multiple contour closed curves with the center point of the mold. These contour closed curves are arranged sequentially from the inside to the outside with the center point of the mold as the center. The center point of the mold is the maximum compensation point, and the deflection compensation value on the contour curves is equal. The deflection compensation value of the multiple contour curves decreases sequentially from the direction closer to the center point of the mold to the direction farther away from the center point of the mold.

[0003] A double-groove mold consists of two fixedly connected single molds. The double-groove mold has two machining centers, which are the center points of the two single molds respectively. The forming force of the double-groove mold is concentrated at the machining centers of the two single molds. The center point of the double-groove mold is not consistent with the machining center of the double-groove mold. If the contour curve of the double-groove mold is directly drawn with the center point of the double-groove mold, the double-groove mold will produce a relatively serious deformation deviation. Summary of the Invention

[0004] The main objective of this invention is to propose a deflection compensation method for double-groove molds, which aims to improve the problem of severe deformation deviation in double-groove molds.

[0005] To achieve the above objectives, the present invention proposes the following steps: S1: Determine the deflection compensation value of the center point of a single mold, draw multiple first contour curves with the center point of the single mold as the center, and determine the deflection compensation value of any one of the first contour curves. S2: Determine the deflection compensation value of the center point of the double-groove mold, draw multiple second contour curves with the center point of the double-groove mold, and determine the deflection compensation value of any one of the second contour curves. S3: Select any point on a single mold as the point to be measured; S4: Calculate the first deflection compensation value of the test point based on the positional relationship between the test point and the first contour curve; S5: Calculate the second deflection compensation value of the test point based on the positional relationship between the test point and the second contour curve; S6: Summing the first deflection compensation value and the second deflection compensation value of the test point to obtain the final deflection compensation value of the test point; S7: Select other test points and repeat steps S4-S6; S8: In the processing data stage of the double-groove mold, deflection compensation is performed on the double-groove mold according to the final deflection compensation value of the test point.

[0006] In one embodiment, step S1 further includes the following steps: S11: Use the finite element analysis (FEA) numerical simulation method to perform stress analysis on a single mold, observe the deformation of the single mold under simulated load, and record the deflection deformation at each position of the single mold. S12: The sum of the deflection deformation at the center point of a single mold and the manufacturing error is used as the deflection compensation value at the center point of a single mold.

[0007] In one embodiment, in step S2, the multiple second contour curves are multiple concentric circles, and the center of the second contour curve coincides with the center point of the double-groove mold.

[0008] In one embodiment, with the concave mold of the double-groove mold as the negative direction, the deflection compensation value of the center point of the double-groove mold is -0.40mm; the maximum distance between the center of the double-groove mold and the edge of the concave mold is set as L; the second contour curve is set as three curves; the radius of the first contour curve is R1=L*0.2, and the deflection compensation value of the first contour curve is -0.24mm; the radius of the second contour curve is R2=L*0.8, and the deflection compensation value of the second contour curve is 0mm; the radius of the third contour curve is R3=L*1.4, and the deflection compensation value of the second contour curve is 0.12mm.

[0009] In one embodiment, step S4 includes: S41: Starting from the center point of the single mold, draw a first ray that passes through the point to be measured; S42: Using the center point of a single mold and multiple first contour curves, the first ray is divided into several first line segments; S43: Measure the length of the first line segment where the point to be measured is located, and then calculate the slope of the first line segment where the point to be measured is located; S44: Measure the distance between the point to be measured and the endpoint of the first line segment where the point to be measured is located, and calculate the first deflection compensation value of the point to be measured based on the slope of the first line segment where the point to be measured is located.

[0010] In one embodiment, step S5 includes: S51: Starting from the center point of the double-groove mold, draw a second ray that passes through the point to be measured; S52: Divide the second ray into several second line segments through the center point of the double-groove mold and multiple second contour curves; S53: Measure the length of the second line segment where the point to be measured is located, and calculate the slope of the second line segment where the point to be measured is located; S54: Measure the distance between the point to be measured and the endpoint of the second line segment where the point to be measured is located, and calculate the second deflection compensation value of the point to be measured based on the slope of the second line segment where the point to be measured is located.

[0011] In one embodiment, in step S1, the first contour curve is set to three.

[0012] In one embodiment, with the concave die of the double-groove mold as the negative direction, when the single mold is used to process the outer panel of an automobile, the deflection compensation value of the center point of the single mold is -0.26 mm, and the deflection compensation values ​​of the three first contour curves are -0.14 mm, 0 mm and 0.12 mm respectively.

[0013] In one embodiment, with the concave die of the double-groove mold as the negative direction, when the single mold is used to process the inner panel of an automobile, the deflection compensation value of the center point of the single mold is -0.32mm, and the deflection compensation values ​​of the three first contour curves are -0.16mm, 0mm and 0.12mm respectively.

[0014] In one embodiment, when the two single molds are symmetrical to each other, the deflection compensation values ​​at the symmetrical points of the two single molds are equal; Step S7 includes: S71: Calculate the final deflection compensation value of the test point on a single mold: S72: The symmetrical point of the test point on another single mold is obtained by axisymmetry. The deflection compensation value of the symmetrical point is equal to the deflection compensation value of the test point.

[0015] The technical solution of this invention takes into account that the center of a single mold is a concentrated stress point. A first contour curve is drawn with the concentrated stress point of the single mold as the center point, and then the first deflection compensation value of the test point is obtained. The first deflection compensation value can compensate for the deflection deformation of the single mold centered on the center point of the single mold. Considering the deflection deformation of the double-groove mold as a whole, a second contour curve is drawn with the center point of the double-groove mold as the center, and the second deflection compensation value of the test point is obtained. The second deflection compensation value is the deflection compensation for the deflection deformation of the double-groove mold as a whole. The first deflection compensation value and the second deflection compensation value are summed to obtain the final deflection compensation value. The final deflection compensation value is related to both the deflection deformation of the double-groove mold as a whole and the deflection deformation of the single mold itself as a concentrated stress point. Compensating the double-groove mold with the final deflection compensation value can improve the problem of the serious deformation deviation of the double-groove mold. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the first contour curve in step S1 of an embodiment of the double-groove mold deflection compensation method provided by the present invention. Figure 2 This is a schematic diagram of the second contour curve in step S2 of an embodiment of the double-groove mold deflection compensation method provided by the present invention; Figure 3 A schematic diagram of the first contour curve and the second contour curve in an embodiment of the double-groove mold deflection compensation method provided by the present invention; Figure 4 This is a schematic diagram of step S1 in an embodiment of the present invention, showing the determination of positioning points on a single mold. Figure 5 This is a schematic diagram of determining the centers of each circle on a single mold in step S1 of an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the calculation of the radii corresponding to the centers of each circle on a single mold in step S1 of an embodiment of the present invention; Figure 7 This is a schematic diagram of step S1 in an embodiment of the present invention, in which circles are drawn using the centers of each circle on a single mold. Figure 8 This is a schematic diagram showing the connection of the definition lines on the single mold in step S1 of an embodiment of the present invention; Figure 9This is a schematic diagram of multiple definition lines on a single mold in step S1 of an embodiment of the present invention.

[0018] Explanation of icon numbers: 1. Double-groove mold; 11. Single mold; 2. First contour curve; 3. Second contour curve; 4. First ray; 41. First line segment; 5. Second ray; 51. Second line segment; The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0021] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0022] The forming pressure of automotive stamping and drawing dies can reach thousands of tons. Under heavy loads, the dies and worktables will undergo deflection deformation. To cope with the deflection deformation of the stamping dies, deflection compensation is performed on the lower side (concave surface) of the die (usually the upper die). Deflection compensation is performed starting from the center point of a single-slot die. The downward deflection compensation at the center point of the single-slot die is the largest, and the remaining deformation is driven by contour curves. A common double-slot die consists of two single dies that are axially symmetrical and fixedly connected. The double-slot die can simultaneously produce two parts. The double-slot die has two production centers, and the center point of the double-slot die is not the same as the production center. Deflection compensation for the double-slot die is only performed starting from the center point of the double-slot die, without considering the deflection deformation of the stress points of the single dies. This will result in a relatively serious deformation deviation in the double-slot die.

[0023] This invention proposes a deflection compensation method for double-groove molds to improve the problem of severe deformation deviation in double-groove molds.

[0024] Please see Figure 1 , Figure 2 and Figure 3 The double-groove mold 1 includes two fixedly connected single molds 11. The two single molds 11 are axially symmetrical. The center of the single mold 11 is the center of gravity of the single mold 11. The center of the double-groove mold 1 is the intersection of the line connecting the centers of the two single molds 11 and the plane of symmetry between the two single molds 11. That is, the center of the double-groove mold 1 is the center of gravity of the double-groove mold 1.

[0025] In this embodiment, the direction of the double-groove mold 1 closest to its concave mold is taken as the negative direction, and the plane perpendicular to the negative direction is taken as the working plane. The contour curves are all drawn on the working plane. Unless otherwise specified, the center point of the single mold 11 is the orthogonal projection of the center of the single mold 11 onto the working plane, and the center point of the double-groove mold 1 is the orthogonal projection of the center of the double-groove mold 1 onto the working plane. When the deflection compensation value of a point of the double-groove mold 1 is negative, it means that the concave mold surface of the double-groove mold 1 is convexly compensated in the negative direction, and the height value of the convex compensation is the absolute value of the deflection compensation.

[0026] This method includes the following steps: Step S1: First, obtain the deflection compensation value of the center point of the single mold 11 through analysis. Then, select an appropriate number of first contour curves 2 according to the requirements and determine the deflection compensation value corresponding to each first contour curve 2. Finally, draw the first contour curve 2 on the working plane with the center point of the single mold 11 as the center. Step S2: First, determine the deflection compensation value of the center point of the double-groove mold 1. Then, select an appropriate number of second contour curves 3 and select the deflection compensation value corresponding to each second contour curve 3 according to the number of second contour curves 3. Finally, draw the second contour curves 3 on the working plane with the center point of the double-groove mold 1 as the center. Step S3: Select any point on the single mold 11 as the point to be measured; Step S4: Given the deflection compensation value of the center point of the single mold 11 and the deflection compensation value corresponding to each first contour curve 2, calculate the first deflection compensation value of the test point based on the position and distance relationship between the test point and multiple first contour curves 2. Step S5: Given the deflection compensation value of the center point of the double-groove mold 1 and the deflection compensation value corresponding to each second contour curve 3, calculate the second deflection compensation value of the test point based on the position and distance relationship between the test point and multiple second contour curves 3. Step S6: The final deflection compensation value of the test point is obtained by summing the first deflection compensation value and the second deflection compensation value of the same test point; Step S7: Select other test points. Multiple test points can be selected by sampling at equal intervals. Then repeat steps S4-S6 to obtain the final deflection compensation value of other test points; obtain the final deflection compensation value of each point of the double-groove mold 1. Step S8: In the machining data stage of the double-groove mold 1, the final deflection compensation value of each position of the double-groove mold 1 is added to the machining value of the double-groove mold 1, thereby adding deflection compensation for the double-groove mold 1 in the machining data stage of the double-groove mold 1.

[0027] Considering that the center point of the single mold 11 is the concentrated stress point, the single mold 11 will produce deflection deformation centered on its center point. Taking the concentrated stress point of the single mold 11 as the center point, the first deflection compensation value of the test point is obtained. The first deflection compensation value can compensate for the deflection deformation of the single mold 11 centered on its center point.

[0028] The double-groove mold 1 includes two fixedly connected single molds 11. When processing parts with the double-groove mold 1, considering the deflection deformation of the double-groove mold 1 as a whole, the second deflection compensation value of the test point is obtained with the center point of the double-groove mold 1 as the center. The second deflection compensation value can compensate for the deflection deformation of the double-groove mold 1 as a whole.

[0029] In the technical solution provided by the present invention, the final deflection compensation value is obtained by summing the first deflection compensation value and the second deflection compensation value. The final deflection compensation value is related to both the deflection deformation of the double-groove mold 1 as a whole and the deflection deformation of the single mold 11 itself as a concentrated stress point. The final deflection compensation value is closer to the actual deflection deformation of the double-groove mold 1. By using the final deflection compensation value to compensate for the deflection of the double-groove mold 1, the problem of the serious deformation deviation of the double-groove mold 1 can be improved.

[0030] In one embodiment, step S1, determining the deflection compensation value at the center point of a single mold, includes: Step S11: Use the finite element analysis (FEA) numerical simulation method to perform stress analysis on the single mold 11, observe the deformation of the single mold 11 under simulated load, and record the deflection deformation at each position of the single mold 11, especially the value of the deflection deformation at the center point of the single mold 11. Step S12: The sum of the deflection deformation at the center point of the single mold 11 and the manufacturing error is used as the deflection compensation value at the center point of the single mold 11.

[0031] When performing finite element numerical simulation analysis on a single mold 11, the dimensions of the single mold 11 and the size of the parts corresponding to the mold 11 will affect the deflection deformation of the single mold 11.

[0032] When performing stress analysis on single mold 11, the deflection deformation at the center point of single mold 11 is the largest. After recording the deflection deformation value at the center point of single mold 11, the deflection compensation value at the center point of single mold 11 can be calculated. Taking the maximum deformation at the center point of single mold 11 as 0.24mm as an example, the actual value during manufacturing is often 0.02mm larger than the theoretical value, i.e., the common manufacturing error is 0.02mm. When performing deflection compensation on single mold 11, the deflection compensation is applied to the concave surface of single mold 11. The sum of the maximum deformation of the center point of single mold 11 (0.24mm) and the manufacturing error (0.02mm) is taken as the absolute value of the deflection compensation value at the center point of single mold 11, i.e., the deflection compensation value at the center point of single mold 11 is -0.26mm.

[0033] In one embodiment of the present invention, in step S1, the first contour curve 2 is set to three. Alternatively, the first contour curve 2 can be set to four, five, or more, depending on the requirements.

[0034] In one embodiment of the present invention, in step S1, when the single mold 11 is used to process the outer panel of an automobile, i.e., when the single mold 11 is an outer panel mold, the deflection compensation value of the center point of the single mold 11 is set to -0.26mm. Then, the deflection compensation values ​​corresponding to the three first contour curves 2 are set to -0.16mm, 0mm, and 0.12mm respectively, and the three first contour curves 2 are successively moved away from the center point of the single mold 11. Common automobile outer panels include the left and right front door outer panels and the left and right rear door outer panels. When the single mold 11 is an outer panel mold, the number of first contour curves 2 and the corresponding deflection compensation values ​​of the first contour curves 2 can be directly selected, reducing the preparation work before drawing the first contour curves 2. Alternatively, other numbers of first contour curves 2 can be selected according to requirements, and the deflection compensation values ​​corresponding to the first contour curves 2 can be determined, and then the first contour curves 2 can be drawn on the single mold 11.

[0035] In one embodiment of the present invention, in step S1, when the single mold 11 is used to process the inner panel of an automobile, i.e., when the single mold 11 is an inner panel mold, the deflection compensation value of the center point of the single mold 11 is set to -32mm. Then, the deflection compensation values ​​corresponding to the three first contour curves 2 are set to -0.16mm, 0mm, and 0.12mm, respectively, and the three first contour curves 2 are successively moved away from the center point of the single mold 11. Common automobile inner panels include the left and right front door inner panels and the left and right rear door inner panels. When the single mold 11 is an inner panel mold, the number of first contour curves 2 and the corresponding deflection compensation values ​​of the first contour curves 2 can be directly selected, and then the first contour curves 2 can be drawn on the single mold 11, reducing the preparation work before drawing the first contour curves 2. Alternatively, other numbers of first contour curves 2 can be selected according to requirements, and the deflection compensation values ​​corresponding to the first contour curves 2 can be determined. Finally, the first contour curves 2 can be drawn on the single mold 11.

[0036] Please see Figure 1 and Figure 3 In one embodiment of the present invention, step S4 includes: Step S41: Starting from the center point of the single mold 11 on the working plane, draw a first ray 4 that passes through the point to be measured; Step S42: With the help of the center point of the single mold 11 and multiple first contour curves 2, the first ray 4 can be divided into several first line segments 41, and no first line segment 41 crosses any first contour curve 2. Step S43: One end of the first line segment 41 where the test point is located is located on a first contour curve 2, and the other end is located on another first contour curve 2 or the center point of the single mold 11. The deflection compensation values ​​of the two ends of the first line segment 41 where the test point is located are obtained. The length of the line segment where the test point is located is measured by measurement, and the slope of the line segment where the test point is located is calculated. Specifically: Let the two endpoints of the first line segment 41 where the test point is located be N1 and N2 respectively, and let N1 be located on the side of N2 that is closer to the center point of the single mold 11. Let the length of the first line segment 41 where the test point is located be N2-N1, let the deflection compensation value corresponding to the first contour curve 2 where N1 is located be h1, let the deflection compensation value corresponding to the first contour curve 2 where N2 is located be h2, and let the slope of the first line segment 41 where the test point is located be K1=(h2-h1) / (N2-N1). Step S44: Use a measuring tool to measure the distance between the point to be measured and point N1, and set the distance between the point to be measured and point N1 as M-N1. Set the first deflection compensation value of the point to be measured as H1, then the first deflection compensation value of the point to be measured is H1 = (M-N1)*K1+h1. When the point to be measured is located on a first contour curve 2, the first deflection compensation value of the point to be measured is equal to the deflection compensation value corresponding to the first contour curve 2.

[0037] When selecting the number of first contour curves 2, the density of first contour curves 2 can be increased by increasing the number of first contour curves 2 and reducing the distance between them. This helps to reduce the length of each first line segment 41, making multiple first line segments 41 fit more closely to the deflection deformation curve of the single mold 11. As a result, the first deflection compensation value of the measured point is closer to the deflection deformation value of the measured point when the single mold 11 is deformed.

[0038] Common double-groove molds 1 are symmetrical about each other along a plane of symmetry. The plane of symmetry of the double-groove mold 1 is perpendicular to the working surface. The double-groove mold 1 is axially symmetrical about the working surface. The shape of the double-groove mold 1 is relatively regular. Therefore, in one embodiment of the present invention, in step S2, multiple second contour curves 3 are set as concentric circles, and the centers of the multiple second contour curves 3 are all the center points of the double-groove mold 1, which makes it convenient to draw the second contour curves 3.

[0039] In one embodiment of the present invention, in step S2, the maximum distance between the center point of the double-groove mold 1 and the edge of the concave mold of any single mold 11 on the working plane is set as L. Three second contour curves 3 are set: the radius R1 of the first second contour curve 3 is L*0.2, and the deflection compensation value of the first second contour curve 3 is -0.24mm; the radius R2 of the second second contour curve 3 is L*0.8, and the deflection compensation value of the second second contour curve 3 is 0mm; the radius R3 of the third second contour curve 3 is L*1.4, and the deflection compensation value of the second second contour curve 3 is 0.12mm. Before drawing the second contour curves 3, the number of pre-defined second contour curves 3 can be selected to directly start drawing the second contour curves 3, which improves the efficiency of drawing the second contour curves 3.

[0040] Please see Figure 2 and Figure 3 In one embodiment of the present invention, step S5 includes: Step S51: Starting from the center point of the double-groove mold 1, draw a second ray 5 that passes through the point to be measured; Step S52: Through the center of the double-groove mold 1 and multiple second contour curves 3, the second ray 5 is divided into several second line segments 51, and no second line segment 51 crosses any second contour curve 3. Step S53: Measure the length of the second line segment 51 where the test point is located. One end of the second line segment 51 is located on a second contour curve 3, and the other end is located on the center point of the second contour curve 3 or the double groove mold 1. Obtain the deflection compensation values ​​at both ends of the second line segment 51 where the test point is located, and calculate the slope of the second line segment 51 where the test point is located. Specifically: Let the two endpoints of the second line segment 51 at both ends of the point to be measured be N3 and N4 respectively. Point N3 is located on the side of point N4 that is close to the center point of the double groove mold 1. Let the length of the second line segment 51 where the point to be measured is located be N4-N3. Let the deflection compensation value corresponding to the second contour curve 3 where point N3 is located be h3. Let the deflection compensation value corresponding to the second contour curve 3 where point N4 is located be h4. Then the slope of the second line segment 51 where the point to be measured is located is K2=(h4-h3) / (N4-N3). Step S54: Use tools to measure the distance between the point to be measured and point N3, and set the distance between the point to be measured and point N3 as M-N3. Set the second deflection compensation value of the point to be measured as H2. Then the second deflection compensation value of the point to be measured can be obtained as H2 = (M-N3)*K2+h3. When drawing the second contour curve 3, the density of the second curves can be increased by increasing the number of second contour curves 3. This reduces the distance between adjacent second curves and decreases the length of each second line segment 51, allowing multiple second line segments 51 to better conform to the overall deflection deformation curve of the double-groove mold 1. This makes the second deflection compensation value closer to the deflection compensation value of the double-groove mold 1 as a whole.

[0041] A common double-groove mold 1 is an axisymmetric figure, meaning that the two single molds 11 on the double-groove mold 1 are mutually axisymmetric. The axis of symmetry between the two single molds 11 is the axis of symmetry of the double-groove mold 1 itself. The center points of the two single molds 11 are axially symmetric, and the axis of symmetry between the two single molds 11 passes through the center point of the double-groove mold 1. When drawing the first contour curve 2 on the two single molds 11, two sets of first contour curves 2 with equal numbers and equal deflection values ​​are often selected, so that the two sets of first contour curves 2 are axially symmetric about the axis of symmetry of the double-groove mold 1.

[0042] The deflection compensation values ​​of the center points of the two single molds 11 are equal, and the two sets of first contour curves 2 are axially symmetric. It can be found that the first deflection compensation values ​​of the two mutually axially symmetric points on the two single molds 11 are equal.

[0043] The double-groove mold 1 is axially symmetric, and the center point of the double-groove mold 1 is located on the line of symmetry. The second contour curve 3 of the double-groove mold 1 is a concentric circle with the center point of the double-groove mold 1 as the center. It is possible to find that the second deflection compensation values ​​of the two axially symmetric points on the two single molds 11 are equal.

[0044] The first deflection compensation values ​​of two axisymmetric points between the two single molds 11 are equal, and the second deflection compensation values ​​of the two axisymmetric points between the two single molds 11 are also equal, making the final deflection compensation values ​​of the two axisymmetric points between the two single molds 11 equal. When calculating the final deflection compensation value of a point on the double-groove mold 1, the final deflection compensation value of each point on one single mold 11 can be calculated first. Then, the corresponding point on the other single mold 11 can be found using the axisymmetric method, and finally, the final deflection compensation value of the corresponding point on the other single mold 11 can be obtained, which can save labor intensity.

[0045] In one embodiment of the present invention, when the two single molds 11 are axially symmetrical to each other, the deflection compensation values ​​at symmetrical points between the two single molds 11 are equal. Step S7 includes: Step S71: Calculate the final deflection compensation value of the test point on a single mold 11: Step S72: Obtain the symmetrical point of the test point on another single mold 11 by means of axis symmetry. The deflection compensation value of the symmetrical point is equal to the deflection compensation value of the test point.

[0046] The first contour curve 2 only needs to be drawn on one single mold 11, instead of drawing the first contour curve 2 on two single molds 11 at the same time; the final deflection compensation value of the symmetrical point on the other single mold 11 can be obtained by calculating the final deflection compensation value of several test points on one single mold 11, which reduces the workload and improves the work efficiency.

[0047] The draw bead is located on the outer side of the cavity edge of the single mold 11; the single mold 11 part of the double groove mold 1 is mostly an irregular shape. When drawing the first contour curve of the single mold 11, it is necessary to follow the product characteristics, approach the direction of the product, and finally generate the contour curve.

[0048] In one embodiment of the present invention, taking a fender mold as an example, the fender mold is a single mold 11 of a double-groove mold 1. Step S1 includes the following steps for drawing a first contour curve 2 on the single mold 11, where the units of the values ​​are all in millimeters: Step S11: Please refer to Figure 4Make a point from the edge of the die cavity and the center of the draw bead of the single mold 11; Step S12: Please refer to Figure 5 Determine points A, B, C, D, and E, and use points A, B, C, D, and E as the centers of circles, respectively. Step S13: Please refer to Figure 6 and Figure 7 Draw circles with radius R(a) centered at points A, B, C, and D respectively, and then draw a circle with radius r(a) centered at point E. Step S14: Please refer to Figure 8 Connect circles A and B, B and D, D and E, E and C, and C and A with tangents; when the tangent connecting circles A and E does not intersect circle C, create a definition line without considering circle C, and connect circles E and A with the tangent; connect adjacent tangents to draw a complete definition line, and use the definition line as the first contour curve 2; Step S15: Please refer to Figure 9 Draw four defining lines, and use each of the four defining lines as a first contour curve 2.

[0049] By reserving data in advance, deflection compensation can be performed on the double-groove mold 1 during the data processing stage, which can reduce the workload during mold assembly, reduce the difficulty of on-site debugging, and shorten the debugging period.

[0050] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for compensating the deflection of a double-groove mold, characterized in that, Includes the following steps: S1: Determine the deflection compensation value of the center point of a single mold, draw multiple first contour curves with the center point of the single mold as the center, and determine the deflection compensation value of any one of the first contour curves. S2: Determine the deflection compensation value of the center point of the double-groove mold, draw multiple second contour curves with the center point of the double-groove mold, and determine the deflection compensation value of any one of the second contour curves. S3: Select any point on a single mold as the point to be measured; S4: Calculate the first deflection compensation value of the test point based on the positional relationship between the test point and the first contour curve; S5: Calculate the second deflection compensation value of the test point based on the positional relationship between the test point and the second contour curve; S6: Summing the first deflection compensation value and the second deflection compensation value of the test point to obtain the final deflection compensation value of the test point; S7: Select other test points and repeat steps S4-S6; S8: In the processing data stage of the double-groove mold, deflection compensation is performed on the double-groove mold according to the final deflection compensation value of the test point.

2. The method for compensating deflection of a double-groove mold as described in claim 1, characterized in that, Step S1, the step of determining the deflection compensation value of the center point of a single mold, includes: S11: Use the finite element analysis (FEA) numerical simulation method to perform stress analysis on a single mold, observe the deformation of the single mold under simulated load, and record the deflection deformation at each position of the single mold. S12: The sum of the deflection deformation at the center point of a single mold and the manufacturing error is used as the deflection compensation value at the center point of a single mold.

3. The method for compensating deflection of a double-groove mold as described in claim 1, characterized in that, In step S2, the multiple second contour curves are multiple concentric circles, and the center of the second contour curve coincides with the center point of the double-groove mold.

4. The method for compensating deflection of a double-groove mold as described in claim 3, characterized in that, Taking the direction closest to the concave surface of the double-groove mold as the negative direction, the deflection compensation value at the center point of the double-groove mold is -0.40mm; the maximum distance between the center of the double-groove mold and the edge of the concave surface of the double-groove mold is set as L; the second contour curve is set as three curves; the radius of the first contour curve is R1=L*0.2, and the deflection compensation value of the first contour curve is -0.24mm; the radius of the second contour curve is R2=L*0.8, and the deflection compensation value of the second contour curve is 0mm; the radius of the third contour curve is R3=L*1.4, and the deflection compensation value of the second contour curve is 0.12mm.

5. The method for compensating deflection of a double-groove mold as described in claim 1, characterized in that, Step S4 includes: S41: Starting from the center point of the single mold, draw a first ray that passes through the point to be measured; S42: Using the center point of a single mold and multiple first contour curves, the first ray is divided into several first line segments; S43: Measure the length of the first line segment where the point to be measured is located, and then calculate the slope of the first line segment where the point to be measured is located; S44: Measure the distance between the point to be measured and the endpoint of the first line segment where the point to be measured is located, and calculate the first deflection compensation value of the point to be measured based on the slope of the first line segment where the point to be measured is located.

6. The method for compensating deflection of a double-groove mold as described in claim 1, characterized in that, Step S5 includes: S51: Starting from the center point of the double-groove mold, draw a second ray that passes through the point to be measured; S52: Divide the second ray into several second line segments through the center point of the double-groove mold and multiple second contour curves; S53: Measure the length of the second line segment where the point to be measured is located, and calculate the slope of the second line segment where the point to be measured is located; S54: Measure the distance between the point to be measured and the endpoint of the second line segment where the point to be measured is located, and calculate the second deflection compensation value of the point to be measured based on the slope of the second line segment where the point to be measured is located.

7. The method for compensating deflection of a double-groove mold as described in claim 1, characterized in that, In step S1, the first contour curve is set to three.

8. The method for compensating deflection of a double-groove mold as described in claim 7, characterized in that, Taking the direction closest to the concave surface of the double-groove mold as the negative direction, when the single mold is used to process the outer panel of an automobile, the deflection compensation value of the center point of the single mold is -0.26mm, and the deflection compensation values ​​of the three first contour curves are -0.14mm, 0mm and 0.12mm respectively.

9. A method for compensating the deflection of a double-groove mold as described in claim 7, characterized in that, Taking the direction closest to the concave surface of the double-groove mold as the negative direction, when the single mold is used to process the inner panel of an automobile, the deflection compensation value of the center point of the single mold is -0.32mm, and the deflection compensation values ​​of the three first contour curves are -0.16mm, 0mm and 0.12mm respectively.

10. A method for compensating the deflection of a double-groove mold as described in claim 3, characterized in that, When two single molds are axially symmetrical to each other, the deflection compensation values ​​at the symmetrical points of the two single molds are equal; Step S7 includes: S71: Calculate the final deflection compensation value of the test point on a single mold: S72: The symmetrical point of the test point on another single mold is obtained by axisymmetry. The deflection compensation value of the symmetrical point is equal to the deflection compensation value of the test point.

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