JP2011028486A - Drawing creation support device, drawing creation support method, drawing creation support program and recording medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a creation time of a two-dimensional drawing by imparting a tolerance even to an inclined face. <P>SOLUTION: In this drawing creation support device, a face tolerance part obtains a tolerance of each face from a tolerance corresponding to a face attribute and a normal vector of each face in each component of local coordinates. An edge tolerance part obtains a tolerance of each line by composing the tolerances of the faces constituting each line, and sets it as an edge tolerance vector. A point tolerance part obtains a tolerance of each vertex by composing the tolerances of the lines constituting each vertex, and performs obtaining as a point tolerance vector. A dimension/tolerance addition part decides a dimension vector to a dimension between a line or a point, and the origin, confirms whether or not a direction of the edge tolerance vector of the line or the point tolerance vector of the point, and a direction of the dimension vector accord, and determines a sign of the tolerance. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a drawing creation support apparatus, a drawing creation support method, a drawing creation support program, and a recording medium that automatically read tolerance information from a three-dimensional model and automatically add tolerance information to a two-dimensional drawing dimension.

  Patent Document 1 is known as a technique for generating a dimension for a two-dimensional drawing from a three-dimensional drawing. The CAD drawing creation apparatus of Patent Document 1 copies dimensions in order to reduce the labor and time for rewriting a two-dimensional drawing in a design using three-dimensional CAD. Patent Document 2 discloses a technique for copying tolerance information of a three-dimensional drawing to a two-dimensional drawing. The CAD apparatus of Patent Document 2 reads tolerance information set in advance for each surface color with respect to the dimension designated from the origin, and determines the tolerance in the normal direction of the surface constituting the solid.

JP 2001-92865 A JP 2009-9313 A

  However, since the technique of Patent Document 2 is a method of reading a single tolerance with respect to a dimension designated from the origin, a plane inclined from the X-axis, Y-axis, and Z-axis directions on the local coordinates (the normal direction is X There is a problem that tolerance cannot be given to a surface that is not in the direction of the axis, the Y-axis, or the Z-axis, and the cumulative dimension cannot be recognized.

  It is a main object of the present invention to provide a technique for giving a tolerance to a plane inclined from the X-axis, Y-axis, and Z-axis directions on the local coordinates, and shortening the creation time of a two-dimensional drawing.

  The drawing creation support apparatus of the present invention includes a recording unit, a CR suppression unit, a face tolerance unit, an edge tolerance unit, a point tolerance unit, a CR suppression release unit, a two-dimensional diagram development unit, and a dimension / tolerance addition unit. The recording unit records one or more face attributes determined in advance, tolerance for each coordinate axis corresponding to each face attribute, and a target solid in which the face attribute and local coordinates of each surface are determined. The CR suppression unit generates the CR suppression target solid by suppressing the C plane and the R plane of the target solid. The face tolerance unit obtains the tolerance of each surface of the CR suppression target solid for each component of the local coordinate from the tolerance corresponding to the normal vector of each surface and the face attribute. The edge tolerance unit obtains the tolerance of each line of the CR suppression target solid by combining the tolerances of the surfaces constituting each line in accordance with a predetermined edge setting priority order, and sets it as an edge tolerance vector. The point tolerance unit obtains the tolerance of each vertex of the CR suppression target solid by synthesizing the tolerances of the lines constituting each vertex according to a predetermined point setting priority order, and obtains it as a point tolerance vector. The CR suppression cancellation unit cancels the suppression of the C plane and the R plane of the CR suppression target solid from which the edge tolerance vector and the point tolerance vector are determined, and determines the target solid with the tolerance vector. The two-dimensional diagram development unit develops the target solid with a tolerance vector into a two-dimensional drawing. The dimension / tolerance adding unit determines the dimension vector from the origin to the line or the direction of the line with respect to the dimension of the line or point and the origin, and the dimension vector to the edge tolerance vector of the line or the point tolerance vector of the point If there is a component whose direction matches the direction, the tolerance of the matching direction is the tolerance of the dimension, and the edge tolerance vector of the line or the point tolerance vector of the point has a component whose direction is opposite to that of the dimension vector Is reversed by reversing the sign of the tolerance in the reverse direction to obtain the tolerance of the dimension.

  For example, in the face tolerance section, for each surface, the axial tolerance in which the normal vector of the surface has a component is the tolerance corresponding to the face attribute of the surface, and the axial direction has no component Therefore, the tolerance for each component of the local coordinates may be obtained. The edge tolerance unit may synthesize the surface tolerances by selecting one of the surface tolerances constituting each line for each axial direction in accordance with a predetermined edge setting priority order. The edge setting priority order is to give priority to the tolerance of a surface when one of the surfaces constituting a line has only one component of local coordinates, or to give priority to the smaller tolerance. , You can set in advance. The point tolerance unit may synthesize vertex tolerances by selecting one of the tolerances of the lines constituting each vertex for each axial direction in accordance with a predetermined point setting priority order. The point setting priority order is to give priority to the tolerance of a line when one of the lines composing a vertex is parallel to one of the local coordinate axes, or to give priority to the one with the smaller tolerance. That's fine.

  Furthermore, the recording unit may also record dimension data with tolerances of subordinate elements based on features other than local coordinates. Then, a dependent element arrangement unit for adding or deleting a dependent element with a tolerance to the tolerance vector-added solid may be provided.

  According to the drawing creation support apparatus of the present invention, tolerance can be given even if the normal direction is a surface that does not coincide with the X-axis, Y-axis, or Z-axis direction of the local coordinates, and the tolerance of the line or vertex can be obtained. As a result, it is possible to shorten the creation time of the two-dimensional drawing. In addition, when a dependent element arrangement part is also provided, tolerances of dependent elements based on features other than local coordinates can be given to the two-dimensional drawing.

The figure which shows the function structural example of the drawing creation assistance apparatus of this invention. The figure which shows the example of a processing flow of the drawing creation assistance apparatus of this invention. The figure which shows the example of a processing flow of an object solid setting means. The perspective view which shows the example of the molded article solid to which the tolerance corresponding to a face attribute was provided with respect to each surface. The perspective view which shows the example of an initial stage solid. The perspective view which shows the image of the Boolean calculation of an initial stage solid and a molded article solid. The perspective view which shows the example of a difference solid. The perspective view which shows the image which cut | disconnected the difference solid by the parting surface. The perspective view which shows the example of the fixed side cavity and movable side cavity which were formed by dividing | segmenting differential solid by a parting surface. The perspective view which shows the example which set the local coordinate to the movable side cavity. The perspective view which shows the example of CR suppression object solid which suppressed C surface and R surface. The perspective view which shows an image when the normal vector determines the tolerance of the surface which corresponds with the axial direction of a local coordinate. The perspective view which shows an image when determining the tolerance of the surface where a normal vector does not correspond to the axial direction of a local coordinate. The perspective view which shows the tolerance of each line of CR suppression object solid. The perspective view which shows the tolerance of each vertex of CR suppression object solid. The perspective view which shows a flange. The perspective view which added the flange to the object solid with a tolerance vector. The perspective view which shows an ejector groove | channel. The perspective view which deleted the ejector groove | channel from the object solid with a tolerance vector which added the flange. The perspective view which shows a mode when a part of flange is trimmed. The figure which shows the example which expand | deployed the object solid with a tolerance vector to 3 face drawing. The figure which provided the dimension with respect to the line parallel to the coordinate axis of a local coordinate, and defined the dimension vector with respect to 3 plane drawing of object solid with a tolerance vector. The figure which also gave the tolerance with respect to a line with respect to the 3rd figure of the object solid with a tolerance vector. The figure which shows 3 views of the object solid with a tolerance vector from which the overlap dimension with respect to the line was deleted. The figure which gave the dimension of the intersection of an outline line or a hidden line, and the origin, and defined the dimension vector to the 3rd page figure to which the dimension with tolerance to a line was added. The figure which also gave the tolerance with respect to an intersection with respect to the 3 face drawing of the object solid with a tolerance vector. The figure which shows the 3rd page figure of the object solid with a tolerance vector from which the overlap dimension with respect to the intersection was deleted. The figure which shows the 3rd page figure of the object solid with a tolerance vector to which the dimension and tolerance of the C surface and the R surface were given. The figure which shows 3 views of the object solid with a tolerance vector to which the dimension and tolerance of the dependent element were also given. The perspective view which shows the shape of the object solid for demonstrating the function of a dimension synthetic | combination part. The figure which shows the dimension at the time of performing the process of Example 1 with respect to the object solid of FIG. 30, and a tolerance. The figure which summarized the dimension and tolerance of FIG. The figure which shows the example of the processing flow of the drawing creation assistance apparatus of the modification 1.

  Hereinafter, embodiments of the present invention will be described in detail. In addition, the same number is attached | subjected to the structure part which has the same function, and duplication description is abbreviate | omitted.

  FIG. 1 shows a functional configuration example of the drawing creation support apparatus of the present invention, and FIG. 2 shows a processing flow example of the drawing creation support apparatus of the present invention. The drawing creation support apparatus includes a recording unit 190, a CR suppression unit 110, a face tolerance unit 120, an edge tolerance unit 130, a point tolerance unit 140, a CR suppression release unit 150, a two-dimensional drawing development unit 160, a dimension / tolerance addition unit 170, A target solid setting unit 500 is provided. Moreover, you may also provide the dependent element arrangement | positioning part 210, the dimension synthetic | combination part 310, and the correction part 410. FIG.

  The target solid setting unit 500 may include an initial solid generation unit 510, a Boolean operation unit 520, a parting plane setting unit 530, and a local coordinate setting unit 540. FIG. 3 shows an example of the processing flow of the target solid setting means 500. First, the processing flow for setting the target solid will be described. The recording unit 190 records one or more predetermined face attributes, tolerances for each coordinate axis corresponding to each face attribute, and a molded product solid in which the face attribute is assigned to each surface. “Face attribute” indicates the properties of a surface such as a high-accuracy surface, a medium-accuracy surface, a parting surface, an abutting surface, a sliding surface male, a sliding surface female, a press-fitting surface male, and a press-fitting surface female. The “tolerance for each coordinate axis corresponding to each face attribute” is set, for example, in the Z-axis direction of the three-dimensional orthogonal coordinate system (X-axis, Y-axis, Z-axis) (surface that opens and closes the mold) In this case, the high accuracy surface is [± 1 μm, ± 1 μm, ± 1 μm], the medium accuracy surface is [± 0.01 mm, ± 0.01 mm, ± 0.01 mm], and the parting surface is [−0. 01 mm, -0.01 mm, +0.01 mm], the abutting surface is [+0.01 mm, +0.01 mm, +0.01 mm], and the sliding surface male is [-0.01 mm, -0.01 mm, -0.01 mm]. ], The sliding surface knife is [+0.01 mm, +0.01 mm, +0.01 mm], the press-fitting surface male is [+0.01 mm, +0.01 mm, +0.01 mm], and the press-fitting surface knife is [−0.01 mm, − 0.01mm, -0.01mm] . Here, [+0.01 mm, +0.01 mm, −0.01 mm] means that tolerances in the X-axis direction are +0.01 mm and −0 mm, tolerances in the Y-axis direction are +0.01 mm, −0 mm, and Z-axis direction. It means that the tolerance is +0 mm and -0.01 mm. In the following, when the unit is mm, the unit is omitted and expressed as [+0.01, +0.01, −0.01]. FIG. 4 is a diagram illustrating an example of a molded product solid in which tolerances corresponding to face attributes are assigned to each surface. The plane of the molded product solid 3 is a face attribute of a medium-precision surface, and is defined with a tolerance of [± 0.01, ± 0.01, ± 0.01] with respect to the origin of the local coordinates. The R plane and the C plane each have a tolerance of ± 0.01 mm with respect to the reference of the R plane and the C plane.

  The initial solid generation unit 510 generates an initial solid 2 in which the face attributes of each surface are determined according to input information input by an operator using an external input device or input information recorded in advance (S510). . FIG. 5 is a diagram showing an example of an initial solid. The initial solid 2 is arranged in the global coordinate system 1 and the face attribute of each surface is determined, so that the corresponding tolerance is determined. The Boolean calculation unit 520 generates a differential solid 2 ′ in which the molded product solid is deleted from the initial solid by Boolean calculation of the initial solid 2 and the molded product solid 3 (S <b> 520). FIG. 6 is a diagram showing an image of a Boolean operation between the initial solid 2 and the molded product solid 3, and FIG. 7 is a diagram showing an example of a differential solid. The space 4 of the differential solid 2 ′ is a portion where the molded product solid 3 is deleted. The surface formed by forming the space 4 in the differential solid 2 ′ takes over the tolerance of the molded product solid 3.

  The parting surface setting unit 530 divides the differential solid 2 'by the parting surface 5 having a predetermined tolerance, and generates a fixed side cavity and a movable side cavity (S530). The predetermined tolerance of the parting surface 5 is, for example, [−0.01, −0.01, +0.01]. FIG. 8 is a diagram showing an image obtained by cutting the differential solid 2 ′ with the parting surface 5, and FIG. 9 is a diagram showing examples of the fixed side cavity 21 and the movable side cavity 22 formed by dividing the differential solid 2 ′ with the parting surface. It is. The surface cut by the parting surface 5 is determined by the face attribute of the parting surface. Depending on the cutting position on the parting surface 5, another face attribute may be further set on a surface for which a face attribute has already been determined. Therefore, in step S530, when there are two or more face attributes of the fixed cavity 21 and the movable cavity 22, the surfaces of the fixed cavity 21 and the movable cavity 22 are determined according to the predetermined face setting priority. Processing for determining face attributes is also performed. For example, priority may be given to the face attribute of the parting surface, and the corresponding tolerance of the face attribute is one-sided tolerance, one with smaller tolerance, one with tolerance specified, or one with no tolerance specified ( You may decide to give priority in the order of general tolerance). For example, in the example of FIG. 8, the upper surface of the space 4 is set to the face attribute of the medium accuracy surface, but is also set to the parting surface 5. When the face setting priority is higher for the parting surface, the face attributes of the lower surface of the fixed cavity 21 are all parting surfaces, and the corresponding tolerances are [−0.01, −0. 01, +0.01].

  The local coordinate setting unit 540 sets local coordinates for the fixed-side cavity 21 and the movable-side cavity 22 (S540). FIG. 10 is a diagram illustrating an example in which local coordinates are set in the movable cavity 22. In the following processing, the movable side cavity 22 is set as a target (target solid) for creating a two-dimensional drawing.

  The movable cavity 22 that is the target solid set by the processing up to step S540 may be recorded in the recording unit 190. Note that information on the target solid may be input from the outside and recorded in the recording unit 190, and the processing may be started from this state. As described above, when the process is started from the state in which the target solid is recorded in the recording unit 190, it is not necessary to record the information on the molded product solid 3 in the recording unit 190.

  The CR suppression unit 110 suppresses the C surface and the R surface of the movable cavity 22 (the target solid in the following process) to generate a CR suppression target solid 23 (S110). FIG. 11 is a diagram illustrating an example of a CR suppression target solid in which the C plane and the R plane are suppressed. A face attribute is defined for each surface of the CR suppression target solid 23. Each face attribute has tolerances defined in the X-axis direction, the Y-axis direction, and the Z-axis direction.

  The face tolerance unit 120 obtains the tolerance of each surface of the CR suppression target solid 23 for each component of the local coordinate from the tolerance corresponding to the normal vector of each surface and the face attribute (S120). For example, the face tolerance unit 120 sets, for each surface, the tolerance in the axial direction in which the normal vector of the surface has a component as a tolerance corresponding to the face attribute of the surface, and an axis having no component. By not defining the tolerance of the direction, the tolerance for each component of the local coordinates may be obtained. This process will be specifically described with reference to the drawings. FIG. 12 is a diagram illustrating an image when the tolerance of a surface whose normal vector coincides with the axial direction of the local coordinate is determined. FIG. 13 is a diagram showing an image when the tolerance of a surface whose normal vector does not match the axial direction of the local coordinates is determined. When the normal vector is a surface that coincides with the axial direction of the local coordinates, the normal vector is defined as a primary normal vector. Then, the tolerance of this surface is set to only the component that matches the primary normal vector in the tolerance corresponding to the face attribute, and the other components do not define the tolerance (see FIG. 12). “−” In FIG. 12 indicates that this axial tolerance is not defined. Further, the face tolerance unit 120 decomposes the normal vector 31 into a vector that matches the axial direction of the local coordinates when the normal vector is a surface that does not match the axial direction of the local coordinates (a surface that is inclined with respect to the local coordinates). To do. The decomposed vectors are set as secondary normal vectors 32 and 33. Then, the tolerance of this surface is limited to only the component that matches the quadratic normal vector in the tolerance corresponding to the face attribute, and the other components do not define the tolerance (see FIG. 13). In the case of FIG. 13, since the secondary normal vector is only in the Y-axis direction and the Z-axis direction, the tolerance in the X-axis direction is not defined. Since the tolerance of each surface is determined in this way, the tolerance can be determined even for a surface inclined with respect to the local coordinates.

  The edge tolerance unit 130 determines the tolerance of each line of the CR suppression target solid 23 by synthesizing the tolerances of the surfaces constituting each line according to the predetermined edge setting priority order, and sets it as an edge tolerance vector (S130). For example, the surface tolerances are synthesized by selecting one of the surface tolerances constituting each line in each axial direction in accordance with a predetermined edge setting priority order. As a predetermined edge setting priority order, a component whose surface tolerance matches the primary normal vector is given priority over a component which matches the secondary normal vector, and a component having a smaller tolerance is given priority. There are things. Further, the edge tolerance vector is determined in a direction that coincides with the sign of the tolerance. FIG. 14 is a diagram illustrating the tolerance of each line of the CR suppression target solid. In this figure, the edge tolerance vector is disassembled and displayed in the axial direction of the local coordinates. Also, since tolerances for all lines are very complicated, the tolerances and edge tolerance vectors for some lines are omitted.

  The point tolerance unit 140 obtains the tolerance of each vertex of the CR suppression target solid 23 by synthesizing the tolerances of the lines constituting each vertex according to a predetermined point setting priority order, and sets it as a point tolerance vector (S140). For example, the surface tolerances are synthesized by selecting one of the surface tolerances constituting each line in each axial direction in accordance with a predetermined edge setting priority order. As the predetermined edge setting priority order, when a line is parallel to any axis of local coordinates, priority is given to other lines, and priority is given to the one with smaller tolerance. Further, the point tolerance vector is determined in a direction that coincides with the sign of the tolerance. FIG. 15 is a diagram illustrating the tolerance of each vertex of the CR suppression target solid. In this figure, the point tolerance vector is disassembled and displayed in the axial direction of the local coordinates. In addition, since tolerances for all vertices are very complicated, tolerances and point tolerance vectors for some vertices are omitted.

  The CR suppression cancellation unit 150 cancels the suppression of the C plane and the R plane of the CR suppression target solid 23 from which the edge tolerance vector and the point tolerance vector are obtained, and determines the tolerance vector-added target solid 22 '(S150). The tolerance vector-added target solid 22 ′ is a solid in which the tolerance of each surface, the edge tolerance vector, and the point tolerance vector are given to the movable cavity 22. Note that the shape of the tolerance vector-added solid 22 'is the same as that of the movable cavity 22 shown in FIG.

  If there is a dependent element having a feature reference other than the local coordinates, the drawing creation support apparatus 100 may also include a dependent element arrangement unit 210. The recording unit 190 may also record dimension data with tolerances of dependent elements. Then, the subordinate element arrangement unit 210 adds or deletes subordinate elements with tolerances to the tolerance vector addition target solid 22 '(S210). At this time, the tolerance information of the subordinate elements is inherited. Dependent elements include flanges, ejector grooves, reliefs, gas vents, pitched features, and the like. FIG. 16 is a diagram showing a flange, and FIG. 17 is a diagram in which the flange is added to the tolerance vector-added solid 22 '. Since the reference of the shape of the flange 6 is not the origin of the local coordinates, the processing is omitted in the processing flow (S110 to S150) for obtaining the tolerance vector-added solid 22 '. FIG. 18 is a diagram showing the ejector groove, and FIG. 19 is a diagram in which the ejector groove is deleted from the object vector with the tolerance vector to which the flange is added. FIG. 20 is a diagram showing a state when a part of the flange is trimmed. As a subordinate element, there is an element to be deleted such as an ejector groove. In addition, trimming (deleting) a part of the flange when it hinders processing is one type of deletion of the dependent elements.

  The process up to this point is the end of creating the three-dimensional drawing. Next, the process proceeds to creation of a two-dimensional drawing. Even in the creation of a two-dimensional drawing, first, only the part where the tolerance is defined by local coordinates is processed. Therefore, the subordinate element placement unit 210 suppresses subordinate elements from the solid created in step S210 (S220). That is, the state before the addition or deletion of the dependent element (tolerance vector-added target solid 22 ′) is temporarily returned.

  The two-dimensional diagram developing unit 160 develops the tolerance vector-added solid 22 'into a two-dimensional drawing (S160). FIG. 21 is a diagram illustrating an example in which the tolerance vector-added target solid 22 ′ is expanded into three views. In the present embodiment, an example of expanding to a three-view drawing has been shown, but what kind of two-dimensional drawing to expand may be determined as appropriate. Also, when developing to a two-dimensional drawing, the outline is a solid middle line and the hidden line is a broken thin line, and the C and tapered surfaces with tolerances are also ridge lines are solid thin lines, and the moderate line is a dot thin line, smooth edge May be developed by a rule such as a two-dot chain line, a gentle line is a dot line, and a ridge line on the C surface without tolerance is not displayed.

  The dimension / tolerance adding unit 170 adds dimensions and tolerances to the two-dimensional drawing (S170). Specifically, it may be added as follows. First, the dimension / tolerance adding unit 170 gives a dimension between a line parallel to the coordinate axis of the local coordinates and the origin. At this time, dimension vectors 8 are determined in the direction of the line to which the dimension is given from the origin. The dimension may be given automatically by the dimension / tolerance adding unit 170 with respect to a line parallel to the coordinate axis of the local coordinates, or may be given according to an instruction from the operator. In the case of automatically assigning dimensions, for example, it may be determined that the dimensions are given only to the outline and hidden lines. FIG. 22 is a diagram showing an image in which a dimension vector is defined by assigning dimensions to a line parallel to the coordinate axis of the local coordinates with respect to a three-view drawing of a solid with a tolerance vector. A dimension vector 8 in the figure shows an example in which a dimension vector is defined for one dimension. The dimension / tolerance adding unit 170 defines such a dimension vector for all assigned dimensions.

  Then, when there is a component whose direction coincides with the dimension vector in the edge tolerance vector of the line to which the dimension is given, the dimension / tolerance adding unit 170 sets the tolerance in the matching direction as the tolerance of the dimension. If the edge tolerance vector of the line has a component whose direction is opposite to that of the dimension vector, the sign of the tolerance in the reverse direction is inverted to obtain the tolerance of the dimension. FIG. 23 is a diagram illustrating an image in which a tolerance with respect to a line is also added to a three-view drawing of a target solid with a tolerance vector.

  Thereafter, the dimension / tolerance adding unit 170 deletes the overlapping dimension. The deletion may be automatically performed by the dimension / tolerance adding unit 170 or may be performed in accordance with an instruction from the operator. In addition, when performing automatically, for example, a priority order may be given in the order of a plan view, a front view, and a side view, and a dimension with a low priority order may be deleted. FIG. 24 is a diagram illustrating a three-view diagram of a solid with a tolerance vector from which an overlapping dimension with respect to a line is deleted.

  Next, the dimension / tolerance adding unit 170 gives a dimension between the intersection of the outline or hidden line and the origin. At this time, dimension vectors are respectively determined from the origin to the direction of the intersection where the dimension is given. Note that the intersection of the outline or hidden line corresponds to the vertex of the tolerance vector-added target solid 22 ′, and therefore, the point tolerance vector is assigned to the intersection to which the dimension is applied. If the way of selecting the intersections to which the dimensions are given is determined in this way, the dimension / tolerance adding unit 170 can automatically assign the dimensions and determine the dimension vector for each dimension. Of course, the operator may determine the intersection for giving the dimension. FIG. 25 is a diagram showing an image in which a dimension vector is defined by adding a dimension between an intersection of an outline or a hidden line and an origin to a three-view drawing to which a dimension with tolerance for a line is added. A dimension vector 8 in the figure shows an example in which a dimension vector is defined for one dimension. The dimension / tolerance adding unit 170 defines such a dimension vector for all assigned dimensions.

  Then, when there is a component whose direction coincides with the dimension vector in the intersection point tolerance vector, the dimension / tolerance adding unit 170 sets the tolerance in the matching direction as the tolerance of the dimension. If the point tolerance vector of the intersection has a component whose direction is opposite to that of the dimension vector, the tolerance of the opposite direction is inverted to obtain the tolerance of the dimension. FIG. 26 is a diagram illustrating an image in which a tolerance with respect to an intersection is also given to a three-view drawing of a target solid with a tolerance vector.

  Thereafter, the dimension / tolerance adding unit 170 deletes the overlapping dimension. The deletion may be automatically performed by the dimension / tolerance adding unit 170 or may be performed in accordance with an instruction from the operator. In addition, when performing automatically, for example, a priority order may be given in the order of a plan view, a front view, and a side view, and a dimension with a low priority order may be deleted, or a dimension may not be concentrated on one drawing. You may give priority. FIG. 27 is a diagram illustrating a three-view diagram of a solid with a tolerance vector from which an overlapping dimension with respect to an intersection is deleted.

  The dimension / tolerance adding unit 170 gives the dimensions and tolerances of the C surface and the R surface. FIG. 28 is a diagram showing a three-sided view of a solid with a tolerance vector to which dimensions and tolerances of the C-plane and R-plane are given. In addition, what is necessary is just to use the dimension and tolerance of C surface and R surface of molded product solid 3 for the dimension and tolerance of C surface and R surface.

  If a dependent element is included, the dependent element placement unit 210 releases the suppression of the dependent element (S230). Further, the dimensions and tolerances of the subordinate elements are given according to the information recorded in the recording unit 190. A center line is added as appropriate. For example, it may be determined that the center line is added only to the visible portion. FIG. 29 is a diagram showing a three-view diagram of a solid with a tolerance vector to which dimensions and tolerances of subordinate elements are also assigned. As described above, by including the dependent element arrangement unit 210, the tolerance of the dependent elements based on the feature other than the local coordinates can be given to the two-dimensional drawing.

  If there are a plurality of dimensions having the same direction and size in the dimensions and tolerances obtained by the dimension / tolerance adding unit 170 and the tolerances also match, the dimension composition unit 310 is also included in the drawing creation support apparatus 100. It may be provided. Then, the dimension composition unit 310 may summarize such dimensions and tolerances for the dimensions (S310). FIG. 30 is a diagram illustrating the shape of the target solid for explaining the function of the dimension composition unit. FIG. 31 is a diagram showing dimensions and tolerances when the processing of the first embodiment is performed on the target solid of FIG. The shape shown in FIG. 30 is not related to the movable cavity 22 used in the description so far, but is shown as a shape suitable for the description of the dimension composition unit 310. This target solid is a surface target shape with local coordinates defined on the center plane. In the case of such a target solid, if processing is performed according to the processing flow of this embodiment, a three-view diagram as shown in FIG. 31 is created. Then, the dimension composition unit 310 compiles a dimension having a plurality of dimensions having the same direction and size and having the same tolerance and a tolerance for the dimension. FIG. 32 is a diagram illustrating a state in which dimensions and tolerances are summarized.

  Further, in this embodiment, it is assumed that accuracy can be ensured by the same processing method in one plane. However, even within one plane, there are cases where the polishing method must be changed depending on the position. In such a case, the drawing creation support apparatus 100 may include the correction unit 410. Then, the correction unit 410 may correct the tolerance of a part of one surface in accordance with an instruction from the operator.

  Since the drawing creation support apparatus 100 has such a configuration, a tolerance can be given even if the normal direction does not coincide with the X-axis, Y-axis, or Z-axis direction of the local coordinates, and the tolerance of the line or vertex is obtained. Therefore, the time for creating a two-dimensional drawing can be shortened. In addition, when a dependent element arrangement part is also provided, tolerances of dependent elements based on features other than local coordinates can be given to the two-dimensional drawing.

[Modification 1]
FIG. 33 shows an example of the processing flow of the drawing creation support apparatus of the first modification. In this modification, the process of placing the dependent element (S210) is performed after the process of the dimension / tolerance adding unit 170 (S170). Therefore, the addition and deletion of the subordinate elements are performed in the process of creating the two-dimensional drawing, and the three-dimensional drawing with the subordinate elements added or deleted is not created. However, on the contrary, the process of suppressing the dependent element (S220) and the process of releasing the suppression of the dependent element (S230) are not required.

  The configuration of the drawing creation support apparatus and other processes are the same as those in the first embodiment. Therefore, the same effect as in the first embodiment can be obtained.

  In addition, the various processes described above are not only executed in time series according to the description, but may be executed in parallel or individually according to the processing capability of the apparatus that executes the processes or as necessary. Needless to say, other modifications are possible without departing from the spirit of the present invention.

  Further, when the above-described configuration is realized by a computer, processing contents of functions that each component should have are described by a program. The processing functions are realized on the computer by executing the program on the computer.

  The program describing the processing contents can be recorded on a computer-readable recording medium. The computer-readable recording medium may be any recording medium such as a magnetic recording device, an optical disk, a magneto-optical recording medium, and a semiconductor memory.

  The program is distributed by selling, transferring, or lending a portable recording medium such as a DVD or CD-ROM in which the program is recorded. Furthermore, the program may be distributed by storing the program in a storage device of the server computer and transferring the program from the server computer to another computer via a network.

  A computer that executes such a program first stores, for example, a program recorded on a portable recording medium or a program transferred from a server computer in its own storage device. When executing the process, the computer reads the program stored in its own recording medium and executes the process according to the read program. As another execution form of the program, the computer may directly read the program from a portable recording medium and execute processing according to the program, and the program is transferred from the server computer to the computer. Each time, the processing according to the received program may be executed sequentially. Also, the program is not transferred from the server computer to the computer, and the above-described processing is executed by a so-called ASP (Application Service Provider) type service that realizes the processing function only by the execution instruction and result acquisition. It is good. Note that the program in this embodiment includes information that is used for processing by an electronic computer and that conforms to the program (data that is not a direct command to the computer but has a property that defines the processing of the computer).

  In this embodiment, the present apparatus is configured by executing a predetermined program on a computer. However, at least a part of these processing contents may be realized by hardware.

DESCRIPTION OF SYMBOLS 100 Drawing creation support apparatus 110 CR control part 120 Face tolerance part 130 Edge tolerance part 140 Point tolerance part 150 CR suppression release part 160 Two-dimensional figure development part 170 Dimension / tolerance addition part 190 Recording part 210 Dependent element arrangement part 310 Dimension composition part 410 Correction Unit 500 Target Solid Setting Unit 510 Initial Solid Generation Unit 520 Boolean Operation Unit 530 Parting Surface Setting Unit 540 Local Coordinate Setting Unit

Claims (12)

A recording unit that records one or more predetermined face attributes, tolerances for each coordinate axis corresponding to each face attribute, and a target solid in which face attributes and local coordinates of each surface are defined;
A CR suppression unit that suppresses the C surface and the R surface of the target solid to generate a CR suppression target solid;
A face tolerance unit for obtaining a tolerance of each surface of the CR suppression target solid for each component of local coordinates from a tolerance corresponding to a normal vector of each surface and a face attribute;
By combining the tolerances of the surfaces constituting each line in accordance with a predetermined edge setting priority order, the tolerance of each line of the CR suppression target solid is obtained, and an edge tolerance unit as an edge tolerance vector;
A point tolerance unit that obtains the tolerance of each vertex of the CR suppression target solid by synthesizing the tolerances of the lines constituting each vertex according to a predetermined point setting priority, and a point tolerance vector;
A CR suppression release unit that cancels the suppression of the C plane and the R plane of the CR suppression target solid for which the edge tolerance vector and the point tolerance vector are obtained, and calculates the target solid with a tolerance vector;
A two-dimensional diagram developing unit that develops the target vector with the tolerance vector into a two-dimensional drawing;
For a line or point to which a dimension is given, a dimension vector is defined in the direction of the line or the point from the origin, and a component whose direction coincides with the edge tolerance vector of the line or the point tolerance vector of the point If it exists, the tolerance in the matching direction is taken as the tolerance of the dimension, and if the edge tolerance vector of the line or the point tolerance vector of the point has a component whose direction is opposite to that of the dimension vector, the tolerance of the opposite direction A drawing creation support apparatus comprising: a dimension / tolerance adding unit that reverses the sign to make a tolerance of the dimension. A drawing creation support apparatus according to claim 1,
The local coordinate is a three-dimensional orthogonal coordinate system composed of xyz axes;
In the face tolerance portion, the axial tolerance in which the normal vector of the surface has a component is a tolerance corresponding to the face attribute of the surface, and the axial tolerance having no component is defined for each surface. By not defining the tolerance, the tolerance for each component of the local coordinate is obtained,
The edge tolerance unit synthesizes the tolerance of the surface by selecting one of the tolerances of the surface constituting each line for each axial direction according to a predetermined edge setting priority.
The point tolerance unit synthesizes the tolerances of the vertices by selecting one of the line tolerances constituting each vertex in each axial direction in accordance with a predetermined point setting priority order. apparatus. A drawing creation support apparatus according to claim 1 or 2,
The recording unit also records dimension data with tolerances of dependent elements based on features other than the local coordinates,
A subordinate element arrangement unit for adding or deleting the subordinate element with a tolerance with respect to the solid with the tolerance vector;
A drawing creation support apparatus characterized by comprising: A drawing creation support apparatus according to any one of claims 1 to 3,
If there are multiple dimensions with the same direction and size in the dimensions and tolerances determined by the dimension / tolerance addition section, and the tolerances also match, a dimension composition section that summarizes the dimensions and tolerances for the dimensions is also available. A drawing creation support apparatus characterized by comprising: A drawing creation support apparatus according to any one of claims 1 to 4,
The recording unit also records a molded product solid having face attributes for each surface,
An initial solid generating unit for generating an initial solid in which the face attribute of each face is determined according to the input information;
A Boolean calculation unit that generates a differential solid obtained by deleting the molded product solid from the initial solid by a Boolean calculation of the initial solid and the molded product solid;
The differential solid is divided by a parting surface having a predetermined tolerance to generate a fixed-side cavity and a movable-side cavity, and two or more face attributes are included in each surface of the fixed-side cavity and the movable-side cavity. If there is a predetermined surface, a parting surface setting unit determined as a priority face attribute according to a predetermined face setting priority order;
A local coordinate setting unit for setting local coordinates for the fixed side cavity and the movable side cavity;
The drawing creation support apparatus, wherein the fixed side cavity or the movable side cavity is the target solid. Record one or more predetermined face attributes, tolerances for each coordinate axis corresponding to each face attribute, and target solids for which the face attributes and local coordinates of each surface are defined;
A CR suppression step of generating a CR suppression target solid by suppressing the C surface and the R surface of the target solid;
A face tolerance step for obtaining a tolerance of each surface of the CR-suppressed solid for each component of local coordinates from a tolerance corresponding to a normal vector of each surface and a face attribute;
An edge tolerance step that obtains the tolerance of each line of the CR suppression target solid by synthesizing the tolerances of the surfaces constituting each line according to a predetermined edge setting priority order, and sets an edge tolerance vector;
A point tolerance step for obtaining a tolerance of each vertex of the CR suppression target solid by synthesizing tolerances of the lines constituting each vertex according to a predetermined point setting priority order, and making a point tolerance vector;
A CR suppression release step for canceling the suppression of the C plane and the R plane of the CR suppression target solid for which the edge tolerance vector and the point tolerance vector are obtained;
A two-dimensional diagram development step of developing the target solid with a tolerance vector into a two-dimensional drawing;
For a line or point to which a dimension is given, a dimension vector is defined in the direction of the line or the point from the origin, and a component whose direction coincides with the edge tolerance vector of the line or the point tolerance vector of the point If it exists, the tolerance in the matching direction is taken as the tolerance of the dimension, and if the edge tolerance vector of the line or the point tolerance vector of the point has a component whose direction is opposite to that of the dimension vector, the tolerance of the opposite direction A drawing creation support method comprising: a dimension / tolerance adding step in which a sign is inverted to make a tolerance of the dimension concerned. A drawing creation support method according to claim 6,
The local coordinate is a three-dimensional orthogonal coordinate system composed of xyz axes;
In the face tolerance step, for each surface, the axial tolerance in which the normal vector of the surface has a component is a tolerance corresponding to the face attribute of the surface, and the axial tolerance having no component is in the axial direction. By not defining the tolerance, the tolerance for each component of the local coordinate is obtained,
In the edge tolerance step, according to a predetermined edge setting priority order, by selecting one of the tolerances of the surface constituting each line for each axial direction, the tolerance of the surface is synthesized,
The point tolerance step synthesizes the tolerances of the vertices by selecting one of the tolerances of the lines constituting the vertices for each axial direction in accordance with a predetermined point setting priority order. Method. A drawing creation support method according to claim 6 or 7,
Record dimension data with tolerance of subordinate elements based on features other than the local coordinates in advance,
A dependent element placement step of adding or deleting the dependent elements with tolerances to the solid with the tolerance vector;
A drawing creation support method characterized by comprising: A drawing creation support method according to any one of claims 6 to 8,
In the dimension and tolerance obtained in the dimension / tolerance adding step, when there are a plurality of dimensions having the same direction and size, and the tolerances also coincide with each other, a dimension synthesis step for combining the dimensions and tolerances for the dimensions is also included. A drawing creation support method characterized by comprising: A drawing creation support method according to any one of claims 6 to 9,
Also record the molded product solid with face attributes for each surface in advance,
An initial solid generating step for generating an initial solid in which the face attribute of each face is determined according to the input information;
A Boolean calculation step of generating a differential solid obtained by deleting the molded product solid from the initial solid by a Boolean calculation of the initial solid and the molded product solid;
The differential solid is divided by a parting surface having a predetermined tolerance to generate a fixed-side cavity and a movable-side cavity, and two or more face attributes are included in each surface of the fixed-side cavity and the movable-side cavity. If there is a predetermined surface, a parting surface setting step determined in the face attribute to be prioritized according to a predetermined face setting priority order;
A local coordinate setting step for setting local coordinates for the fixed-side cavity and the movable-side cavity;
The drawing creation support method, wherein the fixed cavity or the movable cavity is the target solid.   A drawing creation support program for operating a computer as each component of the drawing creation support apparatus according to claim 1.   A computer-readable recording medium on which the drawing creation support program according to claim 11 is recorded.

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