JPH04570A - Cad/cam device - Google Patents

Abstract

PURPOSE:To attain accurate plotting without missing end point correcting work by moving/deforming the 1st shape forming the plan of a core of cavity only by a fixed direction/interval and expanding/contracting the end point of the 2nd shape to terminate the 1st shape. CONSTITUTION:The selection and movement/deformation variable of a cavity/ core designing shape to be offset is inputted from an information input means 1 and stored in an information storing means 2. An information analyzing part 3 calculates the core from the cavity or that of the cavity from the core by a cavity/core designing offsetting means based upon the stored information of the means 2. The calculated outline shape is displayed on a display device 5 through an information display control means 4 through an information display control means 4. Thus, the accurate cavity/core shape can be plotted without missing end point correcting work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a C A D /' CA M apparatus for designing a cavity core for plastic injection molding.

(Prior Art) Fig. 4 is a block diagram showing a conventional CAD/CAM i installation, and in the figure (11) is a CP ((
]2) is a memory that stores data, (1:l) is a printer that records shapes and characters, (14) is a paper tape human output device that punches various data into paper tape and reads the punched paper tape, ( 15HJ A CRT display that displays shapes and characters, (16) a keyboard for inputting data, (17) a CRT display (+! (tablet device) and (18) are auxiliary storage devices in which information to be saved is written and saved information is read (11).These are all connected by a bus (19).

Next, the operation will be explained. When shape information is input using the keyboard (16) or mouse device (17), it is sent to the CPIJ (11) via the bus (19) and stored in the memory (
12), the shape is displayed on the CR7 display (15).
) is displayed.

This shape becomes the outline shape of the product drawing by drawing so that line segments and arcs are continuously connected as shown in FIG.

Next, a part of this outline shape is moved and transformed, as shown in Fig. 3 (b).
) The operation for designing a shape in which the cavity and core are not in contact (hereinafter referred to as shape show.

First, use the mouse device (17) to move and transform the shape.
hit with . At this time, in the shape of Fig. 5, the shape
is (G) ・()l) ・(1), and the shape Y is (G
) ・(I) is the object of movement/transformation.

Next, the amount of movement and deformation is specified using the keyboard (16). At this time, the direction of movement is determined in advance by connecting the start and end points of each figure, and if the amount of movement/deformation is a positive value, it is moved/deformed to the right in the direction of movement, and if it is a negative value, it is moved/deformed to the left. For example, in Fig. 5, the traveling direction is (F) -C
G) −(H) −(1) −(J) When creating a core from a cavity, a negative value is given to move and deform the core inward.

By performing the above operations, the shape
・On the other hand, the shape Y is C as shown in (b) of the same figure.
G) CI) moves and transforms to (N) and (0), respectively.Next, it is necessary to correct the end points for the parts that are not moved or transformed. In the case of shape
In (d) of the same figure, (F) ・()l) ・(J) is (N
) ・(R) ・(S) according to the end point of (0)
・Correct each end point as shown in (T).

(Problems to be Solved by the Invention) Conventional CAD/CAM devices are configured as described above, and in order to design the core from the cavity, it is necessary to move and
The work was troublesome because end points that were not moved or deformed after transformation had to be picked up and end point correction performed.

Therefore, there are problems in that work efficiency is low and, when the contour shape becomes complex, end point correction work is likely to be omitted.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a CAD/CAM device that allows cavity core design to be performed with simple operations.

[Means to solve the problem]

FIG. 1(a) is a functional block diagram showing the configuration of the present invention, and the CAD/CAM device according to the present invention graphically edits a front or side plan view of a cavity, which is the lower mold of an injection mold. When designing a plan view of the core, which is the upper mold, or a plan view of the cavity from the plan view of the core, cut out a section in which the shape is to be edited from the plan view of the core or cavity, and place it inside the cut-out section. processing shape designation means for specifying a first shape that includes both end points and a second shape that includes only one end point and where the end point terminates at the first shape; and movement of the first shape in accordance with the shape editing contents.・Editing information input means for inputting figure editing information consisting of deformation direction and movement/deformation amount, and moving/deforming the first shape forming the plan view of the core or cavity by a certain direction and interval according to the figure editing information. and expanding and contracting the end points of the second shape,
and an offset means for terminating the first shape after graphic editing.

[Operation] In this invention, the shape to be moved or deformed and the shape whose end points are to be corrected among the contour shapes can be specified at the same time, and there is no need to later correct the end points of the shape that has not been moved or deformed. Work efficiency is high, and there is no need to worry about missing work even if the contour shape becomes complex.

〔Example〕

FIG. 1(b) is a block diagram showing one embodiment of the present invention. In the figure, (1) is an information input means for selecting a shape to be offset for cavity core design and inputting the amount of movement and deformation, and this input information is stored in an information storage means (2). ing. Further, based on the information stored in the information storage means (2), the information analysis means (3) uses the cavity/core design offset means to calculate the contour of the cavity from the core or from the core to the cavity. The contour shape calculated in this way is displayed on the display device (5) by the information display control means (4).

Each of the functions shown in Fig. 1(b) can be realized with the same hardware configuration as the conventional device, so we will use the hardware shown in Fig. 4 and perform the processing shown in the flowchart in Fig. 2. The specific operation of this embodiment will be explained.

First, a part of the original drawing to be offset for cavity core design is selected by surrounding it with a rectangle (hereinafter referred to as a rectangle) whose diagonal lines are the two points hit with the mouse device (17) (step 101). At this time, as shown in Fig. 3(a), shapes whose end points are included in rectangles such as (B), (C), and (D) are subject to movement and transformation;
Shapes such as (A) and (E) in which only one end point is included in a rectangle are subject to expansion and contraction in accordance with the movement and deformation while maintaining them on the original drawing. Here, if a shape that includes both end points within a rectangle and is a target of movement/transformation is selected using the mouse device (17), it can be excluded from the target of movement/transformation. For example, (B) ・(C)
・If (D) is the object of movement/transformation,
), if (C) is not subject to movement or deformation, the respective cavities and cores are designed as shown in (C) of the same figure.

Note that the shaded area in the figure indicates the area where plastic is injected.

Next, the amount of movement/deformation (absolute value of the input value) and the direction of movement/deformation (sign of the input value) are input using the keyboard (16) (step 102).

Next, the contour shape of the core (cavity) is calculated from the data obtained by the above input, that is, the shape to be moved/deformed/the shape to be expanded/contracted extracted from the original drawing of the cavity (core), and the amount of movement/deformation. Calculate (step 103). At this time, the shape whose both end points are included in the rectangle is translated in parallel by the amount of movement/deformation. Each shape is expanded/contracted so that the end points of the shape after the parallel movement and the target shape that has not been moved in parallel are the same.

The contour shape of the cavity or core calculated in this way is displayed on the CR7 display (15) (step 105).

Next, expansion and contraction deformation of the end points of the target shape that has not been translated in parallel with respect to the shape after translation will be explained.

(1) Expansion and contraction when obtaining the shapes shown in FIGS. 3(a) to 3(b) will be explained according to FIGS. 3(d) to (f).

First, the rectangle contains both endpoints (B) (C).
Translate (D) by the amount of movement/transformation, and (B)゛
・(C)'・(D)" is created. Figure 3 (d) Next, the intersection U of (B)° and (C)', and (C) (D
)° at the intersection V (B)° ・(C)゛ ・(D)′
Shape (B)” ・(C)” ・(D
)”°Create.

Same figure (e).

Next, connect the end points separated by the transformation. That is, AI
and connect B1 and Dl and El.

Therefore, (B) and (D) are shrunk by h, (C) is shrunk by 2h, and (A) and (E) are stretched by h, creating the shape shown in (f) in the same figure.

(2) The process for obtaining the shapes shown in FIGS. 3(a) to 3(C) will be explained according to FIGS. 3(g) to (i).

First, by selecting with the mouse (17), (C) is excluded from the movement target, and is treated the same as (A) and (E).

Next, move (B) and (D) in parallel by the amount of deformation to create CB)' ・(D)゛ (g) Next, the intersection of (B)° and (C)' W, and cut (C) at the intersection X of (D)゛ and (C)' to create (C)° (h). Next, connect the separated end points by deformation.

Therefore, the lengths of (B) and (D) do not change, (C) shrinks by 2h, (A) and (E) extend by h, and in the same figure (
The shape shown in i) is created.

〔Effect of the invention〕

According to the CAD/CAM device according to the present invention, the shape to be moved/deformed and the shape to be corrected for the end points can be specified at the same time, and there is no need to correct the end points of the shape later, so the operation is simple and Even if the target shape becomes complex, there is no need to perform end point correction, and an accurate cavity/summer shape can be drawn.

[Brief explanation of drawings]

FIG. 1(a) is a functional block diagram showing the configuration of this invention,
Figure 1 (bl is a CAD/CAM device according to this invention!
:) An overall block diagram of an example of an apparatus, FIG. 2 is a 7a-chart showing the operation of the invention, and FIG. Figure 4 is an explanatory diagram regarding the offset for conventional CATI/
A configuration diagram showing the CAM arrangement, Fig. 5 is an explanation of the outline shape Th
a, Fig. 6 is an explanatory diagram regarding conventional movement and deformation 1
In the figure, (1) is an information input means, (2) is an information storage means, (3) is an information analysis means, (4) is an information display means,
(5) is a display device.

Claims (1)

[Claims] Graphically edit the front or side plan of the cavity, which is the lower mold, of the injection mold, and design a plan view of the core, which is the upper mold, or a plan view of the cavity from the plan view of the core.
In an AD/CAM device, a section in which figure editing is to be performed is cut out from a plan view of a core or a cavity, and a first shape including both end points and only one end point are included in the cut out section, and the end point is the first shape. A machining shape specifying means for specifying a second shape that ends with the shape, and a first shape specifying means for specifying a second shape that terminates with the shape;
an editing information input means for inputting figure editing information consisting of the movement/deformation direction and the movement/deformation amount of the shape; and a first part for forming a plan view of the core or cavity according to the figure editing information.
CAD characterized by comprising: an offset means for moving and deforming the shape by a certain direction and interval, and for expanding and contracting the end points of the second shape and terminating it at the first shape after figure editing.
/CAM device.