JP5430529B2 - Fracture surface judgment method and fracture surface judgment device - Google Patents

Description

  The present invention is applied to a part including a first element and a second element that are divided by breaking, and determines the meshing between the first fracture surface of the first element and the second fracture surface of the second element that contacts the first fracture surface. The present invention relates to a fracture surface determination method and a fracture surface determination device.

  The engine is provided with a connecting rod having a small end and a large end. In general, the large end portion of the connecting rod is divided into a main body portion and a cap portion, and after assembling the clamp pin between the main body portion and the cap portion, the cap portion is fastened to the main body portion. In order to position the divided main body portion and cap portion, it is necessary to provide a knock pin or the like between the main body portion and the cap portion. However, the use of the knock pin is a factor that causes an increase in the cost of the connecting rod. It was. Accordingly, a so-called cracking method for breaking and breaking the large end of the connecting rod has been developed (see, for example, Patent Documents 1 and 2). By using this cracking manufacturing method, moderate irregularities can be formed on the fracture surface of the main body part and the cap part, so that the main body part and the cap part can be positioned with high accuracy without using a knock pin. Become. This cracking method is not only applied to the large end of the connecting rod, but can also be applied to a crankcase that supports the journal of the crankshaft.

JP 2004-211731 A JP 2005-106271 A

  By the way, in the cracking manufacturing method, since the generation | occurrence | production of the chip | tip and peeling in the torn surface of a main-body part or a cap part cannot be avoided, there exists a problem that a clearance gap will arise between the torn surfaces which mutually mesh. The gap generated between the fractured surfaces obstructs the contact state of the fractured surfaces, which has been a factor for reducing the strength of the large end of the connecting rod. Therefore, it is necessary to verify the gaps between the fracture surfaces in order to guarantee the strength of the large end portion that is divided by fracture, but by simply examining the surface shape of each fracture surface, It was impossible to verify the gap.

  Therefore, when designing the connecting rod, it is necessary to design it so that the strength is ensured even if some chipping or peeling occurs by designing the connecting rod with a margin at the fracture surface of the large end. there were. However, designing a part with a large margin allows for an increase in the size and cost of the part.Therefore, there is no need to develop a method for determining whether the fracture surface meshes well. It was desired.

  An object of the present invention is to determine the engagement of fracture surfaces that mesh with each other.

The fracture surface determination method of the present invention is executed by a fracture surface determination device and is applied to a part including a first element and a second element which are divided by fracture, and the first fracture surface of the first element and the first element are in contact with the first fracture surface. A fracture surface determination method for determining meshing with a second fracture surface of a second element, wherein first surface shape data of the first fracture surface is read, and second surface shape data of the second fracture surface is read. A shape reading step and a reference point setting step of setting a plurality of first reference points on the first fracture surface and setting a plurality of second reference points corresponding to the first reference point on the second fracture surface A first reference plane including the three first reference points is set as the first fracture surface, and a second reference plane including the three second reference points corresponding to the three first reference points is A reference plane setting step for setting the second fracture surface, and the first reference plane as a reference Converting the first surface shape data into first comparison data, converting the second surface shape data into second comparison data using the second reference surface as a reference, and the first comparison data; And a meshing determination step of determining meshing between the first fracture surface and the second fracture surface based on the second comparison data.

  In the fracture surface determination method of the present invention, in the reference surface setting step, it is determined whether or not the first reference surface and the second reference surface coincide with each other, and the first reference surface and the second reference surface If the two do not match, the first and second reference points are changed and new first and second reference planes are set.

  According to the fracture surface determination method of the present invention, in the meshing determination step, a portion where the difference between the first comparison data and the second comparison data exceeds a predetermined value is determined between the first reference surface and the second reference surface. It is determined that a defective portion has a gap therebetween, and the meshing between the first reference surface and the second reference surface is determined based on the area of the defective portion.

  The fracture surface determination method of the present invention is characterized in that the first reference point is set on the contour line of the first fracture surface, and the second reference point is set on the contour line of the second fracture surface. .

  The fracture surface determination device of the present invention is applied to a part including a first element and a second element that are divided by fracture, and a first fracture surface of the first element and a second fracture surface of the second element that contacts the first fracture surface. And a shape reading means for reading the first surface shape data of the first fracture surface and reading the second surface shape data of the second fracture surface, and Reference point setting means for setting a plurality of first reference points on the fracture surface and setting a plurality of second reference points corresponding to the first reference point on the second fracture surface, and the three first reference points A first reference plane including a point is set as the first fracture surface, and a second reference plane including three second reference points corresponding to the three first reference points is set as the second fracture surface. Surface setting means, and the first surface shape data as the first comparison data on the basis of the first reference surface. Based on the data conversion means for converting and converting the second surface shape data into second comparison data with the second reference surface as a reference, the first comparison data and the second comparison data, It has a meshing judgment means for judging meshing of a section and the 2nd fracture surface.

  In the fracture surface determination device of the present invention, the reference plane setting means determines whether the first reference plane and the second reference plane coincide with each other, and the first reference plane and the second reference plane If the two do not match, the first and second reference points are changed and new first and second reference planes are set.

  In the fracture surface determination device of the present invention, the meshing determination means is configured such that the difference between the first comparison data and the second comparison data exceeds a predetermined value between the first reference surface and the second reference surface. It is determined that a defective portion has a gap therebetween, and the meshing between the first reference surface and the second reference surface is determined based on the area of the defective portion.

  The fracture surface determination device of the present invention is characterized in that the first reference point is set on the contour line of the first fracture surface, and the second reference point is set on the contour line of the second fracture surface. .

  According to the present invention, the first reference surface is set on the first fracture surface, and the second reference surface corresponding to the first reference surface is set on the second fracture surface. In addition, the first surface shape data of the first fracture surface is converted into first comparison data with the first reference surface as a reference, and the second surface shape data of the second fracture surface is converted into second comparison data with the second reference surface as a reference. Has been converted. Then, by comparing the first comparison data and the second comparison data, it is possible to detect chipping and peeling that occur on the fracture surfaces that mesh with each other, and it is possible to grasp the state of occurrence of a gap between the fracture surfaces. Become. Thereby, since the strength of the part to be divided by breaking can be grasped, it becomes possible to achieve miniaturization and weight reduction of the part.

(a) is a front view which shows a connecting rod, (b) is a front view which shows the disassembled connecting rod. It is the schematic which shows an example of a torn surface determination apparatus. It is a flowchart which shows an example of the execution procedure of the torn surface determination method. (a) And (b) is the top view and side view which show a coordinate measuring machine. It is a top view which shows a three-dimensional measuring machine. (a) And (b) is explanatory drawing which shows the setting condition of the reference point in a torn surface. (a) And (b) is explanatory drawing which shows the setting condition of the temporary reference plane in a torn surface. (a) And (b) is sectional drawing which shows roughly the torn surface of a main-body part and a cap part. (a) is explanatory drawing which shows roughly the surface shape data of the torn surface measured, (b) is explanatory drawing which shows roughly the comparison data converted on the basis of the reference plane. (a) is explanatory drawing which shows the comparison data of a torn surface, (b) is explanatory drawing which shows the comparison result of comparison data.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1A is a front view showing a connecting rod 10 (hereinafter referred to as a connecting rod), and FIG. 1B is a front view showing the exploded connecting rod 10. As shown in FIG. 1A, the connecting rod 10 includes a small end portion 12 having a small diameter through hole 11, a large end portion 14 having a large diameter through hole 13, a small end portion 12, and a large end portion 14. And a rod portion 15 for connecting the two. A piston pin (not shown) is assembled to the small end portion 12, and a crank pin (not shown) is assembled to the large end portion 14. Further, as shown in FIGS. 1A and 1B, the large end portion 14 of the connecting rod 10 is divided into a main body portion 16 and a cap portion 17. When assembling the connecting rod 10 to the crankpin, the cap 17 is fastened to the main body 16 using the high tension bolt 18 after the crank pin is sandwiched between the divided main body 16 and the cap 17.

  When the large end portion 14 of the connecting rod 10 is divided, a so-called cracking method is used to improve productivity and positioning accuracy. That is, after the connecting rod 10 is integrally formed using forging or the like, the connecting rod (part) 10 is expanded to the main body portion (first element) 16 by expanding the through hole 13 of the large end portion 14 in the radial direction using a jig. And a cap part (second element) 17. Further, a pair of notches 19 are formed on the inner peripheral surface of the large end portion 14, and the fracture surfaces 20 and 21 are formed to extend in the radial direction starting from the notches 19. These fracture surfaces 20 and 21 have irregularities with appropriate roughness, and when the cap portion 17 is assembled to the main body portion 16, the irregularities of the fracture surfaces 20 and 21 mesh with each other. . Thereby, it becomes possible to improve the positioning accuracy of the main body portion 16 and the cap portion 17, and it is possible to improve the productivity of the connecting rod 10 by reducing knock pins and the like.

  However, since the occurrence of chipping or peeling is unavoidable on the fracture surface 21 of the main body portion 16 and the cap portion 17, a gap is formed between the fracture surfaces 20 and 21 that mesh with each other. Such a gap between the fractured surfaces 20 and 21 hinders the contact state between the fractured surfaces 20 and 21, and thus causes a reduction in the fastening strength between the main body 16 and the cap 17 and the axial force of the high tension bolt 18. It was. Therefore, in order to ensure the required strength and axial force at the large end portion 14 of the connecting rod 10, the state of occurrence of chipping or the like in the fracture surfaces 20, 21 is quantitatively grasped, and the fracture surfaces 20, 21 are engaged. It was necessary to evaluate.

  Next, a fracture surface determination method and a fracture surface determination device 22 according to an embodiment of the present invention will be described. FIG. 2 is a schematic diagram illustrating an example of the fracture surface determination device 22, and FIG. 3 is a flowchart illustrating an example of an execution procedure of the fracture surface determination method. As shown in FIG. 2, the fracture surface determination device 22 includes a three-dimensional measuring machine (shape reading unit) 23 that measures a three-dimensional shape of an object, a control device 24 configured by a CPU, a memory, and the like, a display such as a liquid crystal display A device 25 is provided. The control device 24 includes a reference point setting unit (reference point setting unit) 26, a reference plane setting unit (reference plane setting unit) 27, a data conversion unit (data conversion unit) 28, and a meshing determination unit (meshing determination unit) 29. The visualization processing unit 30 is configured. When determining the meshing of the fracture surfaces 20 and 21 by the fracture surface determination device 22 as described above, as shown in FIG. 3, first, in step S10, surface shape data at each measurement point of each fracture surface 20 and 21 is obtained. (X coordinate value, Y coordinate value, Z coordinate value) is measured by the coordinate measuring machine 23 (shape reading step). Here, FIGS. 4A and 4B are a plan view and a side view showing the coordinate measuring machine 23, and show a measurement situation of the fracture surface 21 of the cap portion 17. FIG. 5 is a plan view showing the three-dimensional measuring machine 23 and shows a measurement state of the fracture surface 20 of the main body 16.

  As shown in FIGS. 4A and 4B, a measurement unit 32 is installed on the pedestal 31 of the coordinate measuring machine 23, and a positioning piece 33 and a positioning pin 34 are installed. And the cap part 17 used as a measuring object is fixed using the positioning piece 33 and the positioning pin 34 so that the torn surface 21 may be made to oppose the measurement unit 32. FIG. The measurement unit 32 includes an irradiation unit 35 that irradiates inspection light toward the fractured surface 21 of the cap unit 17, and a light receiving unit 36 that receives reflected light from the fractured surface 21. Further, the light receiving unit 36 is provided with a CCD camera or the like for photographing the fracture surface 21, and the contour data (X coordinate value, Y coordinate value) of the fracture surface 21 is measured based on the photographed image data. The unevenness data (Z coordinate value) of the fracture surface 21 is measured based on the focusing control information of the CCD camera. The unevenness data of the fracture surface 21 may be measured using a non-contact displacement meter such as a laser probe. Further, as shown in FIG. 5, the surface shape data at each measurement point of the fractured surface 20 is also measured for the main body portion 16 of the connecting rod 10 using the same three-dimensional measuring machine 23 provided with the positioning pins 34 and the like. The

  As described above, when the surface shape data is measured for each fractured surface 20, 21, the process proceeds to step S <b> 11, and the reference point setting unit 26 of the control device 24 sets a plurality of data on each fractured surface 20, 21 based on the surface shape data. The reference point is set (reference point setting step). Here, FIGS. 6A and 6B are explanatory views showing the setting conditions of the reference points on the fracture surfaces 20 and 21. FIG. FIG. 6A shows a fracture surface 20 of the main body 16, and FIG. 6B shows a fracture surface 21 of the cap portion 17. As shown in FIGS. 6A and 6B, the reference point setting unit 26 sets five first reference points A1 to A5 on the contour line of the first fracture surface 20 of the main body 16, and this fracture surface. Five second reference points B <b> 1 to B <b> 5 are set on the contour line of the second fracture surface 21 of the cap portion 17 facing 20. These reference points A1 to A5 and B1 to B5 are reference points that coincide when the fracture surfaces 20 and 21 are brought into contact with each other. That is, the reference points A1 to A5 and B1 to B5 are reference points corresponding to each other. In the case shown in the figure, five reference points are set for each fractured surface, but four reference points may be set for each fractured surface, and six or more reference points are set for each fractured surface. You may do it.

  Next, the process proceeds to step S12, and the reference plane setting unit 27 of the control device 24 selects three points from the reference points A1 to A5 and B1 to B5 set on the fracture surfaces 20 and 21, and sets these three reference points. Including temporary reference planes c1 and c2. Here, FIGS. 7A and 7B are explanatory views showing the setting states of the temporary reference planes c1 and c2 on the fracture surfaces 20 and 21. FIG. 7A shows a fractured surface 20 of the main body 16, and FIG. 7B shows a fractured surface 21 of the cap 17. As shown in FIG. 7A, when the reference points A1 to A3 are selected from the fractured surface 20 of the main body 16, the temporary reference surface (first reference surface) c1 including the reference points A1 to A3 is broken. Set for the cross section 20. Then, as shown in FIG. 7B, reference points B1 to B3 corresponding to the reference points A1 to A3 are selected on the fracture surface 21 of the cap portion 17, and a temporary reference plane (first reference plane including the reference points B1 to B3) 2 reference plane) c2 is set with respect to the fracture surface 21. In FIG. 7, for the convenience of drawing, a triangular reference surface is shown as a part of the temporary reference surfaces c1 and c2. However, the temporary reference surfaces c1 and c2 expand so as to cover the fracture surfaces 20 and 21. It has a flat surface.

  Subsequently, the process proceeds to step S13, where the reference plane setting unit 27 of the control device 24 calculates the distance between the temporary reference plane c1 and the reference points A4 and A5 not included therein, and is included in the temporary reference plane c2 and this. The distance between the reference points B4 and B5 that are not present is calculated. Here, FIGS. 8A and 8B are cross-sectional views schematically showing fracture surfaces 20 and 21 of the main body portion 16 and the cap portion 17. FIG. 8A shows a state in which no chipping occurs at the reference points A1 to A5 and B1 to B5, and FIG. 8B shows a state in which chipping has occurred at the reference point A3. . 8 shows a cross-sectional shape of the main body portion 16 along the α-α line in FIG. 7A, and shows a cross-sectional shape of the cap portion 17 along the β-β line in FIG. 7B. ing. In FIG. 8, for the convenience of drawing, the reference points A1 and A2 are set to the same height position, and the reference points B1 and B2 are set to the same height position.

  As shown in FIGS. 8A and 8B, the distance La1 between the temporary reference plane c1 and the reference point A4 is calculated, and the distance La2 between the temporary reference plane c1 and the reference point A5 is calculated. Further, the distance Lb1 between the temporary reference plane c2 and the reference point B4 is calculated, and the distance Lb2 between the temporary reference plane c2 and the reference point B5 is calculated. In the illustrated case, the length of the vertical line drawn from each of the reference points A4, A5, B4, B5 to the temporary reference planes c1, c2 is calculated, but the present invention is not limited to this. For example, the length of a line extending in the Z-axis direction from the reference points A4, A5, B4, B5 to the temporary reference planes c1, c2 may be calculated.

  Then, it progresses to step S14 and the reference plane setting part 27 of the control apparatus 24 determines whether the distance to temporary reference plane c1, c2 corresponds for every corresponding reference point A4, A5, B4, B5. . First, as shown in FIG. 8A, when the distance La1 and the distance Lb1 match and the distance La1 and the distance La2 match, that is, the inclinations of the temporary reference planes c1 and c2 match. If YES in step S15, the temporary reference surface c1 is set as the official first reference surface C1, and the temporary reference surface c2 is set as the official second reference surface C2. On the other hand, as shown in FIG. 8B, when the distance La1 and the distance Lb1 do not coincide with each other and the distance La1 and the distance La2 do not coincide with each other, that is, the occurrence of the chipping, the temporary reference planes c1 and c2 If the inclinations do not match, the process proceeds to step S16 to determine whether a new temporary reference plane can be set. In step S16, if it is impossible to change the reference point and set a new temporary reference plane, the process proceeds to step S17 to output an error determination and exit the routine. On the other hand, if it is possible to change the reference point and set a new temporary reference plane, the process proceeds to step S12 again to set a new temporary reference plane. Thus, steps S12 to S16 constitute a reference plane setting step for setting the reference planes C1 and C2 on the fracture surfaces 20 and 21.

  In the above description, the matching state of the temporary reference plane is determined by comparing the distance between the reference point and the temporary reference plane. However, the present invention is not limited to this, and the coordinate data of each reference point is used. The coincidence state of the temporary reference plane may be determined by calculating the inclination of the temporary reference plane. Further, when determining the coincidence state of the temporary reference plane, it is not determined whether or not the coincidence is complete, but it is determined whether or not the temporary reference plane coincides in consideration of a predetermined allowable error. ing. In the above description, the distance between the temporary reference plane and two reference points is calculated and compared. However, the distance between the temporary reference plane and one reference point may be calculated and compared. The distance between the reference plane and three or more reference points may be calculated and compared.

  As described above, when the temporary reference planes c1 and c2 are set as the formal reference planes C1 and C2 in step S15, the process proceeds to step S18, and the data conversion unit 28 of the control device 24 sets the reference planes C1 and C2 to the reference planes C1 and C2. As a reference, the surface shape data of the fracture surfaces 20 and 21 is converted into comparison data (data conversion step). Here, FIG. 9A is an explanatory diagram schematically showing the measured surface shape data of the fractured surfaces 20 and 21, and FIG. 9B is a schematic diagram showing comparison data converted with reference to the reference plane. It is explanatory drawing shown in. As shown in FIG. 9A, the surface shape data D1 and D2 measured at each measurement point of the fracture surfaces 20 and 21 are data measured with reference to a predetermined reference point on the coordinate measuring machine 23 side. is there. These surface shape data D1 and D2 are data representing the surface shapes of the fractured surfaces 20 and 21, but the standards of the main body portion 16 and the cap portion 17 do not match. It was impossible to directly compare the data D1 and the surface shape data D2 of the cap portion 17.

  Therefore, as shown in FIG. 9B, after obtaining the reference planes C1 and C2 common to both fractured surfaces 20 and 21, the surface shape data D1 and D2 are the comparison data based on the reference planes C1 and C2. It is converted into da1 to da3 and db1 to db3. By comparing the comparison data da1 to da3 and db1 to db3, it is possible to compare the concavo-convex shapes of the fracture surfaces 20 and 21 meshing with each other, and to grasp the state of occurrence of chipping or peeling at the fracture surfaces 20 and 21. Is possible. The comparison data da1 to da3 and db1 to db3 converted from the surface shape data D1 and D2 are distance data from each measurement point to the reference planes C1 and C2. The comparison data shown in FIG. 9B is the length (distance data) of the vertical line drawn from each measurement point with respect to the reference planes C1 and C2, but is not limited to this. The length (distance data) of a line extending in the Z-axis direction from the point to the reference planes C1 and C2 may be used.

  As described above, when the first surface shape data D1 of the main body portion 16 is converted into the first comparison data da1 to da3, and the second surface shape data D2 of the cap portion 17 is converted into the second comparison data db1 to db3, Proceeding to step S19, the state of occurrence of chipping or the like on each of the fracture surfaces 20, 21 is determined. In step S <b> 19, the meshing determination unit 29 of the control device 24 compares the comparison data da <b> 1 to da <b> 3 at the predetermined measurement points of the main body unit 16 with the comparison data db <b> 1 to db <b> 3 at the corresponding measurement points of the cap unit 17. Thus, it is determined whether or not a chip or the like has occurred in the portion where the measurement point is located. For example, as shown in FIG. 9B, in step S19, the comparison data da1 on the main body portion 16 side and the comparison data db1 on the cap portion 17 side at the measurement point P1 are compared. Further, the comparison data da2 and the comparison data db2 at the measurement point P2 are compared, and the comparison data da3 and the comparison data db3 at the measurement point P3 are compared. In the case shown in the figure, the comparison data da1 and the comparison data db1 match, and the comparison data da3 and the comparison data da3 match, so that a defect or the like is generated at the position where the measurement points P1 and P3 are located. It is confirmed that there is not. On the other hand, since the comparison data da2 and the comparison data db2 deviate from each other by more than a predetermined value, it is confirmed that a chip or the like is generated at the position where the measurement point P2 is located. Then, by comparing the comparison data at all the measurement points, a defective portion in which a gap is generated between the fracture surfaces 20 and 21 due to chipping or the like is specified.

  And the meshing determination part 29 of the control apparatus 24 progresses to step S20, after specifying the defect site | part on the torn surfaces 20, 21, and while integrating the area of the inferior site in each torn surface 20, 21, it is the defect site | part. Based on the area, the meshing of the fracture surfaces 20, 21 is determined (meshing determination step). In step S20, when the area of the defective portion exceeds a predetermined value, it is determined that the meshing is defective because there are many gaps between the fracture surfaces 20 and 21, and the area of the defective portion is below the predetermined value. Is determined to be good because the gap between the fracture surfaces 20 and 21 is small. In addition, when determining the meshing of the fracture surfaces 20 and 21, the determination may be made based on the area ratio of the defective portion occupying the fracture surfaces 20 and 21. In addition, by performing weighting according to a part where a chip or the like has occurred, the degree of influence of the chip or the like may be changed for each part.

  Further, the comparison data and the comparison result on each fractured surface 20, 21 are displayed on the display device 25 after being visualized by the visualization processing unit 30 of the control device 24. Here, FIG. 10A is an explanatory diagram showing comparison data of the fracture surfaces 20 and 21, and FIG. 10B is an explanatory diagram showing a comparison result of the comparison data. In FIG. 10 (a), a light and shaded part means a convex part (high part), and a dark and light part means a concave part (low part). That is, as shown in FIG. 10A, a dark part appearing in a light and shaded region represents a part where a chip or the like has occurred. In this way, not only the determination result of meshing but also the comparison data and the comparison result are displayed on the display device 25 so that the operator can recognize the chipping or the gap.

  As described above, the surface shape data of the fractured surfaces that mesh with each other is read, and the surface shape data is converted into comparison data using the reference surface set on the fractured surface as a reference. In this way, by using the comparison data converted based on the unified standard, it is possible to grasp the occurrence of chipping and peeling at the fracture surface, and determine whether the fracture surface is well meshed It becomes possible to do. As described above, since the fracture surface of the part divided by breaking can be quantitatively evaluated, it is possible to quantitatively grasp the strength of the actually manufactured part. As a result, it is not necessary to set an excessive target strength at the time of designing, and it is possible to achieve a reduction in size and weight of a part to be broken and divided.

  In addition, since the reference point for setting the reference plane is set on the outline of the fracture surface, it is possible to easily set the reference point from image data obtained by imaging the fracture surface. That is, since the outline of the fracture surface corresponds to the edge portion of the image data, the reference point can be set without using a complicated program. In addition, since there are few occurrences of chipping etc. in the contour part of the fracture surface, it is possible to quickly set the reference plane from the temporary reference plane by setting the reference point on the contour line where chipping etc. is difficult to occur It becomes.

  It goes without saying that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above description, the present invention is applied to the connecting rod 10 manufactured by the cracking manufacturing method. However, the present invention is not limited to this, and other parts (crankcase or the like) manufactured by the cracking manufacturing method are used. The present invention may be applied to this. In the above description, the reference point is arranged on the outline of the fracture surface, but the present invention is not limited to this, and the reference point may be set at another part on the fracture surface.

10 Connecting rod (parts)
16 Main body (first element)
17 Cap part (second element)
20 Fracture surface (1st fracture surface)
21 Fracture surface (2nd fracture surface)
22 Fracture surface determination device 23 CMM (shape reading means)
26 Reference point setting section (reference point setting means)
27 Reference plane setting section (reference plane setting means)
28 Data converter (data converter)
29 Meshing determination part (meshing determination means)
A1 to A5 first reference points B1 to B5 second reference points c1 provisional reference plane (first reference plane)
c2 Temporary reference plane (second reference plane)
C1 reference plane (first reference plane)
C2 reference plane (second reference plane)
D1 First surface shape data D2 Second surface shape data da1 to da3 First comparison data db1 to db3 Second comparison data

Claims (8)

A first fracture surface of the first element and a second fracture surface of the second element in contact with the first element, which are applied to a part including the first element and the second element that are executed by the fracture surface determination device and are divided by fracture. A fracture surface determination method for determining the meshing of
A shape reading step of reading first surface shape data of the first fracture surface and reading second surface shape data of the second fracture surface;
A reference point setting step for setting a plurality of first reference points on the first fracture surface and setting a plurality of second reference points corresponding to the first reference point on the second fracture surface;
The first reference plane including the three first reference points is set as the first fracture surface, and the second reference plane including the three second reference points corresponding to the three first reference points is the second A reference plane setting step for setting the fracture surface;
A data conversion step of converting the first surface shape data into first comparison data on the basis of the first reference surface and converting the second surface shape data into second comparison data on the basis of the second reference surface;
A fracture surface determination method, comprising: a mesh determination step for determining meshing between the first fracture surface and the second fracture surface based on the first comparison data and the second comparison data. The fracture surface determination method according to claim 1,
In the reference plane setting step, it is determined whether or not the first reference plane and the second reference plane coincide with each other, and if the first reference plane and the second reference plane do not coincide with each other, A fracture surface determination method, wherein the first and second reference planes are set by changing the first and second reference points. In the fracture surface determination method according to claim 1 or 2,
In the meshing determination step, a portion where a difference between the first comparison data and the second comparison data exceeds a predetermined value is determined as a defective portion where a gap is generated between the first reference surface and the second reference surface. And determining the meshing between the first reference surface and the second reference surface based on the area of the defective portion. In the fracture surface determination method according to any one of claims 1 to 3,
The first reference point is set on a contour line of the first fracture surface, and the second reference point is set on a contour line of the second fracture surface. A fracture surface that is applied to a part including a first element and a second element that are divided by breaking, and determines the meshing between the first fracture surface of the first element and the second fracture surface of the second element that is in contact with the first fracture surface A determination device,
Shape reading means for reading the first surface shape data of the first fracture surface and reading the second surface shape data of the second fracture surface;
Reference point setting means for setting a plurality of first reference points on the first fracture surface and setting a plurality of second reference points corresponding to the first reference point on the second fracture surface;
The first reference plane including the three first reference points is set as the first fracture surface, and the second reference plane including the three second reference points corresponding to the three first reference points is the second A reference plane setting means for setting the fracture surface;
Data conversion means for converting the first surface shape data into first comparison data using the first reference surface as a reference, and converting the second surface shape data into second comparison data using the second reference surface as a reference;
An apparatus for determining a fracture surface, comprising: a mesh determination means for determining meshing between the first fracture surface and the second fracture surface based on the first comparison data and the second comparison data. In the fracture surface determination device according to claim 5,
The reference plane setting means determines whether or not the first reference plane and the second reference plane coincide with each other, and if the first reference plane and the second reference plane do not coincide with each other, A fracture surface determination device, wherein the first and second reference planes are set by changing the first and second reference points. In the fracture surface determination device according to claim 5 or 6,
The meshing determination means determines a part where a difference between the first comparison data and the second comparison data exceeds a predetermined value as a defective part where a gap is generated between the first reference surface and the second reference surface. And determining the meshing between the first reference surface and the second reference surface based on the area of the defective portion. In the fracture surface judging device according to any one of claims 5 to 7,
The fracture surface determination device, wherein the first reference point is set on an outline of the first fracture surface, and the second reference point is set on an outline of the second fracture surface.