JP3394086B2 - How to create boss shape data by CAD - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a boss shape data creating method by CAD capable of easily creating boss shape data of a molding die or a molded article molded by the die.

[0002]

2. Description of the Related Art Conventionally, when designing a molding die for obtaining a molded product by using a synthetic resin, the designer passes a specification of the die having a draft to the manufacturer, and The wooden pattern was created manually by referring to the specification.

[0003]

However, since the manufacturer refers to the two-dimensional design drawing drawn in the specifications, the wooden pattern is created in a shape different from the shape actually intended by the designer. There was a risk of In particular, the boss shape is a truncated cone shape or a truncated pyramid shape with a draft, and if the axial direction of the truncated cone shape or the truncated pyramid is deviated from the die cutting direction, the sloped surface It is difficult to create the tree pattern exactly as the designer intended because the gradient of is complicatedly changed. Therefore, in the process of creating the tree pattern,
There was the inconvenience that the wood pattern had to be recreated many times while repeating trial and error.

The present invention has been made in order to solve this kind of problem, and provides a boss shape data creating method by CAD which can easily and quickly obtain a boss shape as intended by a designer. The purpose is to do.

[0005]

In order to achieve the above-mentioned object, the present invention is a method of creating boss shape data of a molding die or a molded product molded by the mold in CAD, which is a seat surface. And a step of selecting the graphic data according to the shape of the seat surface from the graphic data including boss shape parameters composed of a draft surface that expands from the seat surface in the die cutting direction The process of inputting information of the shape of the seat surface, the normal direction of the seat surface, the drawing direction of the mold, and the draft to the parameters of the generated graphic data, and the normal direction and the normal direction based on the input value to the parameter.
The seat is orthogonal to the first plane parallel to the die cutting direction and is the seat.
A second plane passing through the center of the plane is set, and by the second plane,
The process of dividing the outer peripheral line of the seat surface into two, and the specified seat
Divide into two by the normal direction of the surface, the die cutting direction, and the draft
To create draft planes from each of the perimeters created
And a surface that smoothly connects the draft surfaces
At the same time, a surface is to be set up on the part surrounded by the outer peripheral line.
And a process of creating a seat surface by.

[0006]

According to the boss shape data creation method by CAD of the present invention, the figure data is selected from the figure data based on the shape of the seat surface, and the shape of the seat surface is set as the parameter of the selected figure data. By inputting information about the normal direction of the seat surface, the die cutting direction and the draft angle, the boss shape data is automatically created in CAD. Therefore, if NC processing data is created based on the boss shape data and a mold is manufactured by using the NC processing data, the draft surface of the boss shape portion of the mold or a molded product molded by the mold is accurate and the designer's intention It can be created quickly, easily and reliably on the street.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A boss shape data creating method by CAD according to the present invention will be described in detail below with reference to the accompanying drawings with reference to preferred embodiments.

As shown in FIG. 1, a CAD device 10 according to the present embodiment is an external storage device 1 comprising a CPU 12 for graphic processing and a hard disk storing graphic data.
4, internal memory 16, CR for displaying figures, numerical values, etc.
The T display 18 includes a keyboard 20 for inputting numerical data and the like, and an instruction input device 22 such as function keys for instructing graphic processing and display switching.

The external storage device 14 stores boss-shaped graphic data as a parameter. That is, as shown in FIGS. 2 to 4, types I to III are stored according to the shape of the bottom surface of the boss being circular, oval, or substantially rectangular. In the type I, as shown in FIG. 2, the seat surface center c, the seat surface radius R, the seat surface normal direction vector V1, the die cutting direction vector V2, the height H, and the draft (angle). ) Θ is stored as a parameter. type
II and III are substantially the same, but as shown in FIG. 3, the parameters of the major axis r1 and the minor axis r2 that form the ellipse of the seat surface in place of the radius R are set in the dip II, and
For type III, as shown in FIG. 4, the long side length r of the rectangle
3, the short side length r4 and the corner radius of curvature R'are set.

Further, the external storage device 14 stores free-form surface data forming draft surfaces S1 and S2, which will be described later, and free-form curve data forming free curves L3 and L4.

The CAD device 10 configured as described above
Is used to create boss shape data. Hereinafter, description will be made with reference to the flowchart shown in FIG.

First, the CPU 12 starts a boss shape data creation program. At this time, the external storage device 14
The shape data of the work to which the boss shape is added is read from (step S1).

Next, by operating the instruction input device 22, one boss shape is selected from the above types I to III, and the graphic data of the selected type is sent from the external storage device 14 to the CPU 12.
To read (step S2). Here, the case where the type I is selected will be described below.

Next, the value of each parameter is input by the keyboard 20. In the case of type I, the radius R of the seat surface, the normal direction vector V1 to the seat surface, the die drawing direction vector V2, the height H, and the draft angle θ are input. However,
When the height H is not constant and is defined by a specific surface, H = 0 is input (step S3).

Then, it is determined whether or not H = 0 (step S4).

If H ≠ 0, that is, if the height H is constant, a plurality or a single coordinate position of the center c of the boss-shaped seating surface is designated on the work (step S5). Specifying a plurality means that bosses of the same shape in which the normal direction vector V1 and the drawing direction vector V2 are set in the same direction are created at a plurality of positions of the work at once.

Subsequently, boss shape data is created (step S6). Hereinafter, the flowchart of FIG. 6 and FIGS.
This will be described with reference to FIG.

First, a plane P1 including a normal direction vector V1 and a drawing direction vector V2 is created. Then, a plane P2 that passes through the center c of the seat surface and is perpendicular to the plane P1 is created,
An intersection point p of the circle C having a radius R and the plane P2 which constitutes the seat surface
1. Calculate p2. The circle C is divided into two parts by the intersection points p1 and p2 to become semicircles C1 and C2, respectively (step S6-1) (see FIG. 7). When the normal direction vector V1 and the pulling direction vector V2 match, the plane P including the normal direction vector V1 and passing through the center c of the seat surface
The circle C is divided into two by 1 and the semicircles C1 and C2 are set.

Next, as shown in FIG. 8, a vector v1 passing through a point pi forming the semicircle C1 and parallel to the punching direction vector V2 and a tangent vector v2 of the point pi are set, and the tangent vector v1 is connected to the vector v1. An outer product vector v3 with the vector v2 is set, and the vector v1 and the outer product vector v3 are set.
A plane P3 that includes and and passes through the point pi is created. On the plane P3, as shown in FIG. 9, points qi and qi ′ displaced from the point pi by the height H in the vector v1 direction are set in the direction of the draft θ from the vector v1. The operator uses the points qi, q on the CRT display 18.
An appropriate point qi forming the draft surface is selected from i ′ and the selection result is input from the instruction input device 22.

A point qi corresponding to each point pi forming the semicircle C1 is obtained, and a free curve C1 'is created from each point qi using the free curve data stored in the external storage device 14. Similarly, the free curve C corresponding to the semicircle C2
2'is created (step S6-2) (see FIG. 10).

Further, the semicircles C1 and C2 and the free curve C
The draft surfaces S1 and S2 are created by enlarging or reducing the free-form surface data stored in the external storage device 14 in correspondence with 1'and C2 '(step S6).
-3). This makes it possible to create draft surfaces S1 and S2 to which draft angle θ is applied (see FIG. 10).

Subsequently, a tangent line L connecting the ends E11 and E21, E12 and E22 of the free curves C1 'and C2'.
1. Create L2. Further, line segments L1 ′ and L1 ″ that connect the ends E11 and E21 to the intersection p1 are created, and line segments L2′L2 ″ that connect the ends E12 and E22 to the intersection p2 are created. The surface S3 is surrounded by the tangent line L1, the line segments L1 ′, L1 ″, the surface S4 is surrounded by the tangent line L2, the line segments L2 ′, L2 ″, and the semicircle C1, A surface S5 is created in a portion surrounded by C2 (step S6-
4) (see FIG. 11).

After the boss shape data is created in this way, it is determined whether or not to invert (step S7). CR
A question as to whether or not to invert is displayed on the T display 18, and the instruction input device 22 inputs an inversion or non-inversion.

If not reversed, the boss shape data is stored in the external storage device 14 as it is, and a series of processing is terminated.

In the case of inverting, the boss shape data shown in FIG. 11 is inverted upside down using the surface S5 as a mirror surface (step S8), and the inverted boss shape data is stored in the external storage device 14.

On the other hand, if H = 0 is determined in step S4, the CRT is determined based on the work shape data.
With respect to the three-dimensional model displayed on the display 18, the instruction input device 22 is operated to select one coordinate position for setting the center c of the seat surface (step S9).

Next, the surface S for restricting the height of the boss is specified from the three-dimensional model displayed on the CRT display 18 by the instruction input device 22 (step S10).

Subsequently, boss shape data is created (step S11). Hereinafter, the flowchart of FIG. 12 and FIG.
This will be described with reference to 3 to 15. By the way, step S1
Since 1 to 3 is the same as H ≠ 0, only the outline will be described, and the details will be described thereafter.

The planes P1 and P2 are set and the intersections p1 and p2 are set.
Is set, and the circle C having a radius R constituting the seating surface is divided into two by the intersection points p1 and p2 to be semicircles C1 and C2, respectively (step S11-1) (see FIG. 7). Furthermore, FIG.
, A point qi (height H ′ in the direction of vector v1 (see FIG. 13)) having a draft θ is set for each point pi forming the semicircles C1 and C2, and the external storage device is set. 1
Free curves C1 'and C2' are created from the point qi using the free curve data stored in step 4 (step S11-
2). A draft surface S1 is created from the semicircle C1 and the free curve C1 ′, and a draft surface S2 is created from the semicircle C2 and the free curve C2 ′ (step S11-3) (FIG. 13).
reference).

Then, as shown in FIG. 13, step S
Surface S specified in 10 and draft surfaces S1 and S2
Lines of intersection C1 "and C2" are calculated (step S11-
4). If either or both of the intersecting lines C1 ″ and C2 ″ do not exist, the creation of the boss shape data is stopped.

In the draft surfaces S1 and S2, only the data on the semicircles C1 and C2 of the intersection lines C1 "and C2" are retained and the data on the opposite side are erased. In this way, the draft surfaces S1 and S2 from which unnecessary portions are deleted by the intersection lines C1 ″ and C2 ″ are newly defined as draft surfaces S1 ′ and S2 ′ (step S11-5) (see FIG. 13). ).

Further, as shown in FIG. 14, the intersection line C
The position data of the end point s11 of 1 ″ and the end point s21 of the intersection line C2 ″ and the free curve L3 connecting the end points s11 and s21 from the tangent vectors w1 and w2 at the end points s11 and s21 are stored in the external storage device 14. Create using the free curve data. Similarly, the intersection line C1 ″,
A free curve L4 connecting the endpoints s12 and s22 is created from the position data of the endpoints s12 and s22 of C2 ″ and the tangent vectors w3 and w4 at the endpoints s12 and s22 (step S11-6).

The free-form curves L3 and L4 are projected on the surface S to form along-surface curves L3 'and L4' (step S11-7) (see FIG. 14). If the surface S is a plane, the endpoints s11, s21 and the endpoint S12,
Connect s22 with a straight line, and connect this with the curved lines L3 ', L
4 '.

Finally, the end points s11 and s21 and the intersection point p
Line segments L31 'and L32' connecting 1 and 1 are created, and line segments L41 'and L42' connecting the end points s12 and s22 and the intersection point p2 are created. The surface S3, the surface-side curve L4 ', and the surface-side curve L4', which are surrounded by the surface-side curve L3 ', the line segments L31', and L32 'created in this way,
The surface S4 is created in the part surrounded by the line segments L41 'and L42', and the surface S5 is created in the part surrounded by the semicircles C1 and C2 (step S11-
8) (see FIG. 15). The boss shape data created in this way is stored in the external storage device 14.

Although the case where the type I is selected in step S1 has been described above, only the points different from the type I in the case where the types II and III are selected will be described.

When the type II is selected in step S1, as shown in FIG. 3, the major radius r1 and the minor radius r2 are input as parameters instead of the radius R of the type I (step S2). Hereinafter, the boss shape data is created in the same manner as in the type I, but when the normal direction vector V1 and the drawing direction vector V2 match, as shown in FIG.
A plane P orthogonal to the major axis direction at the midpoint of the major axis r1.
The ellipse C is divided into half ellipses C1 and C2 by 1.

When the type III is selected in step S1, as shown in FIG. 4, the long side length r3, the short side length r4, and the radius of curvature R'are input as parameters instead of the type I radius R. Step S2). Hereinafter, the boss shape data is created in the same manner as the type I, but when the normal direction vector V1 and the drawing direction vector V2 match,
As shown in FIG. 17, at the midpoint of the long side length r3, a substantially rectangular shape C is transformed into a U-shaped line C by a plane P1 orthogonal to the long side.
1 and C2.

As described above, in the boss shape data creating method according to the present embodiment, the type is selected from the graphic data (types I to III) stored in the external storage device 14 according to the shape of the seat surface. By inputting the normal direction vector V1, the die cutting direction vector V2, the die draft θ, etc. for the type parameter, the boss shape data including the draft planes S1 and S2 can be automatically created with high accuracy. . Therefore, N created from the boss shape data
By using the C processing data, it is possible to manufacture a mold in which a draft surface is formed accurately or a molded product molded by the mold as intended by the designer.

At the same time, by reading the shape data of the work from the external storage device 14 and designating the position of the center c of the seat surface, the boss shape data can be accurately created at a predetermined position of the work.

Further, the boss shape data is created by designating the surface to which the draft surface is connected with respect to the shape data of the work, so that the work is processed based on the shape data of the work including the boss shape data. When formed, the work and the boss-shaped portion are surely continuous.

[0041]

According to the method of creating boss shape data by CAD according to the present invention, the following effects can be obtained.

That is, the designer selects the above-mentioned data from the figure data on the CAD based on the shape of the seat surface, and the parameters of the selected data include the shape of the seat surface, the normal direction of the seat surface, If you input the die cutting direction, draft, etc.,
In CAD, boss shape data is automatically created.
Therefore, if NC processing data is created based on the boss shape data and a mold is manufactured by this, the draft surface of the boss shape portion of the mold or a molded product molded by the mold is as designed by the designer. It is easy, fast, and accurate.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a CAD device according to an embodiment of the present invention.

FIG. 2 is a schematic explanatory diagram of graphic data stored in a CAD device according to an embodiment of the present invention.

FIG. 3 is a schematic explanatory diagram of graphic data stored in a CAD device according to an embodiment of the present invention.

FIG. 4 is a schematic explanatory diagram of graphic data stored in a CAD device according to an embodiment of the present invention.

FIG. 5 is a flowchart showing a boss shape data creation method by CAD according to an embodiment of the present invention.

FIG. 6 is a flowchart showing in detail a boss shape data creating method by CAD according to an embodiment of the present invention.

FIG. 7 is an explanatory diagram of a data creation state in the boss shape data creation method by CAD according to the embodiment of the present invention.

FIG. 8 is an explanatory diagram of a data creation state in the boss shape data creation method by CAD according to the embodiment of the present invention.

FIG. 9 is an explanatory diagram of a data creation state in the boss shape data creation method by CAD according to the embodiment of the present invention.

FIG. 10 is an explanatory diagram of a data creation state in the boss shape data creation method by CAD according to the embodiment of the present invention.

FIG. 11 is an explanatory diagram of a data creation state in the boss shape data creation method by CAD according to the embodiment of the present invention.

FIG. 12 is a flowchart showing in detail a boss shape data creating method by CAD according to an embodiment of the present invention.

FIG. 13 is an explanatory diagram of a data creation state in the boss shape data creation method by CAD according to the embodiment of the present invention.

FIG. 14 is an explanatory diagram of a data creation state in the boss shape data creation method by CAD according to the embodiment of the present invention.

FIG. 15 is an explanatory diagram of a data creation state in the boss shape data creation method by CAD according to the embodiment of the present invention.

FIG. 16 is an explanatory diagram of a data creation state in the boss shape data creation method by CAD according to the embodiment of the present invention.

FIG. 17 is an explanatory diagram of a data creation state in the boss shape data creation method by CAD according to the embodiment of the present invention.

[Explanation of symbols]

10 ... CAD device 12 ... CPU 14 ... External storage device 16 ... Internal memory 18 ... CRT display 20 ... Keyboard 22 ... Instruction input device c ... Center of seat surface H, H '... Height S, S3, S
4, S5 ... Surfaces S1, S2 ... draft surface V1 ... normal direction vector V2 ... die drafting direction vector θ ... draft

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) G06F 17/50 JISST file (JOIS)

Claims (4)

(57) [Claims] 1. A method of creating boss shape data of a molding die or a molded product molded by the die in CAD, which comprises expanding a diameter from a seating surface and the seating surface in a die cutting direction. The process of selecting the figure data according to the shape of the seat surface from the figure data including the boss shape parameters composed of the slope surface and the shape of the seat surface and the method of the seat surface as the parameters of the selected figure data. a step of inputting the line direction, die cutting direction and draft information of, Oyo the normal direction on the basis of the input value to the parameter
And perpendicular to a first plane parallel to the die cutting direction and
A second plane passing through the center of the seating surface is set and
The process of dividing the outer peripheral line of the seat surface into two parts, and the normal direction of the specified seat surface, the die cutting direction, and the draft
Therefore, the draft surface is drawn from each of the two divided outer lines.
The process of creating and creating a surface that smoothly connects the draft surfaces
In general, by laying a surface on the part surrounded by the outer peripheral line,
A method of creating boss shape data by CAD, which comprises the step of creating a sitting surface. 2. The method of claim 1 Symbol placement method further includes the step of specifying a process for reading the shape data of the workpiece boss shape is formed, the position of creating a boss shape data on the shape data of the workpiece A method for creating boss shape data by CAD, which comprises: 3. The method according to claim 1 or 2 , further comprising the step of inputting the height of the draft surface from the seat surface as a parameter of the figure data, and creating boss shape data by CAD. Method. 4. The method of claim 2 Symbol placement methods, further characterized in that it consists of the process of draft surface of the boss shape from the shape data of the workpiece to specify a surface to be connected C
A method for creating boss shape data by AD.