JPH09292906A - Cam system for automating escape working of metallic die non-formed part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically prepare data for escape working by automatically judging a part to escapingly work from a metallic die shape model. SOLUTION: A shape feature automatically extracting part 1 retrieves all the projecting part and the recessed part narrowed more than a prescribed degree at a die from die shape data 5 and area data 6 and outputs them to recessed part and projecting part data 7. An escaping part deciding part 2, concerning each recessed part housed in data 7, brings a tool of a prescribed diameter into contact with the recessed part to retrieve the positions of plural contact points with the tool in the neighborhood of the recessed part. Then, the part 2, concerning each of the plural retrieved contact points, calculates respective distances between with the projecting parts housed in data 7 to select a shortest distance among these calculated distances and when the shortest distances obtained with respect to the plural contact points are all longer than a prescribed distance, the part 2 decides to automatically give escaping work concerning the recessed part and outputs the data to working part supporting data 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention determines, for a mold shape model constituted by a free-form surface, a portion to which relief processing by a tool having a predetermined diameter is applied from the shape, and the predetermined portion is applied to the portion. The present invention relates to a CAM system that performs relief processing with a tool having a diameter of.

[0002]

2. Description of the Related Art Conventionally, C has been used in the manufacture of press dies.
When machining NC (numerical control) machine tool of AM (Computer Assisted Machining) system,
Usually, a tool T having a large diameter as shown in FIGS.
4, multiple tools with different diameters, such as tool T5 with smaller diameter and tool T6 with smaller diameter, are used one after another, but in the concave part, only the corresponding convex part can form the panel. Therefore, there are many unnecessary parts for panel molding, and the above NC is required when the upper mold and the lower mold of the mold are matched.
In addition to the uncut portion in the machining step of the machine tool, these unnecessary parts are removed manually by the operator. Therefore, in order to omit such manual work,
It has been considered to remove these non-molded portions by performing relief processing to a portion (non-molded portion) of the concave portion in the mold shape that is unnecessary for panel molding in the above machining step.

[0003]

However, when relief processing is performed in the recess in the die shape in the machining step, three-dimensional shape data (so-called CAD (computer-aided design) that defines a die model representing the die shape is defined. ) Data) for creating relief processing along the non-molding part, it is necessary for the operator to judge from the mold shape whether relief processing can be applied to each recess. There was a problem that the number of data creation steps increased.

An object of the present invention is to create relief processing data by automatically determining a portion to be relief processed from the shape of a die shape model and automatically creating relief processing data. It is an object of the present invention to provide a CAM system for automating the mold non-molding part escape process that reduces the number of steps.

[0005]

According to the present invention, a CAM system for automation of escape processing of a non-molding portion of a mold according to the present invention uses a tool having a predetermined diameter from a shape of a mold shape model constituted by a free curved surface. In the CAM system that determines the part to which the relief processing is applied and performs the relief processing with the tool having the predetermined diameter with respect to the portion, searches for all the convex portions and the concave portions narrower than a predetermined value from the mold shape model. Concave / convex automatic search means, and for each recess of the searched mold shape model, the tool having the predetermined diameter is brought into contact with the vicinity of the recess, and a plurality of tools for the tool having the predetermined diameter are provided in the vicinity of the recess. Find the contact position of
For each of the retrieved plurality of contacts, the distance between the convex portion is calculated, and the shortest distance among the calculated distances is selected, and the shortest distances obtained for the plurality of contacts are all predetermined. If the distance is equal to or more than the distance, the automatic relief processing determining means for determining that the recess processing is to be automatically performed is provided.

According to a second aspect of the present invention, there is provided a CAM system for automation of escape processing of a non-molding portion of a die, wherein the automatic escape processing determining means determines, when the convex portion has a curvature, a cross-sectional curve of the contact point and the convex portion. The difference between the distance to the central point and the radius of curvature of the convex portion is calculated as the distance between the contact point and the convex portion.

In the CAM system for escaping the die non-molding portion according to the present invention, the recess and protrusion automatic retrieval means retrieves all the fillet information from the die shape model and retrieves them. For each fillet of the mold shape model, calculate the direction of the line connecting the centers of curvature radius, and if the direction of the line connecting the centers of curvature radius is not parallel to the pressing direction of the mold, connect the centers of curvature radius. On a predetermined edge extending in the direction along the plane orthogonal to the curved line, from the point other than the end, calculate the inner product of the vector in the pressing direction of the mold and the vector in the center of curvature radius, When the inner product exceeds zero, the fillet is determined to be a convex portion, and when the inner product is zero or less, the fillet is determined to be a concave portion.

In the CAM system for automating the mold non-molding portion escape processing according to the present invention, the recess and protrusion automatic retrieval means retrieves all the fillet information from the die shape model and retrieves them. For each fillet of the mold shape model, the direction of the line connecting the centers of curvature radius is calculated, and when the direction of the line connecting the centers of curvature radius is parallel to the pressing direction of the mold, the CAM system Of the edges extending in the direction along the plane orthogonal to the line connecting the centers of the radiuses of curvature, the direction opposite to the vertical direction of the three-dimensional coordinate system being the pressing direction of the mold is the three-dimensional coordinate system of the CAM system. Of the vector in the direction of the existing side of the curved surface adjacent to the edge and the vector in the direction of the radius of curvature center from a predetermined point on this edge. The calculated, if the inner product is greater than zero to determine the fillet and the convex portion, when the inner product is zero or less is characterized in that to determine the fillet recesses and.

According to a fifth aspect of the present invention, there is provided a CAM system for automating a die non-molding part release process, wherein the automatic escape process means selects the shortest distance, and the fillet of each of the retrieved mold shape models In the direction of the line connecting the curvature radius centers, the foot curve that is a line connecting the end points of the patch line is taken out, and the distance between the foot curve of the fillet determined to be the concave portion and the foot curve determined to be the convex portion, The distance between the foot curve of the fillet determined as the concave portion and the convex portion excluding the fillet determined as the convex portion, or the distance between the contact point and the foot curve of the fillet determined as the convex portion is obtained. It is a feature.

According to a sixth aspect of the present invention, there is provided a CAM system for automating a die non-molding portion, which is less than the predetermined diameter with respect to a concave portion determined by the automatic relief processing determining means to perform the automatic relief processing. It is characterized in that it is provided with a tool machining omitting means for omitting machining with a tool having a diameter of.

[0011]

According to the CAM system for automated escape processing of mold non-molding portion according to the present invention, first, the recess and protrusion automatic searching means first determines the protrusion and the predetermined portion from the mold shape model. Search all recesses narrowed above. Here, the reason why the concave portion narrowed down more than a predetermined value is searched is that the concave portion having a curvature equal to or larger than the tool diameter can be cut with the tool without leaving any uncut portion. Next, the automatic relief processing determining means brings a tool having a predetermined diameter into contact with the vicinity of the recess for each recess of the die shape model retrieved, and makes a plurality of contact points with the tool having the predetermined diameter in the vicinity of the recess. To search for the location. Then, for each of the retrieved plurality of contacts, the distance to the convex portion is calculated, and the shortest distance among these calculated distances is selected. If the distance is equal to or greater than the distance, it is determined that the relief processing is automatically performed for the recess.

As described above, according to the present invention, the shortest distance among the distances between the contact points and the respective contact points with the tool having a predetermined diameter and having the corresponding shape in the vicinity of the searched recess is equal to or more than the predetermined distance. Since it is automatically determined whether or not the relief processing is performed based on whether or not the relief processing is performed, it is possible to perform the relief processing to the NC machine tool and This eliminates the need for manual removal, shortens the die machining time, and eliminates the need for the operator to determine the suitability of relief machining for each recess when creating relief machining data. Therefore, it is possible to reduce the number of man-hours for creating relief processing data.

According to the second aspect of the present invention, in the CAM system for escaping the mold non-molding portion, the distance between the searched contact point and this convex portion when the searched convex portion has a curvature. And the radius of curvature of the protrusion are calculated as the distance between this contact point and this protrusion. Information on the convex portion having the curvature of the mold shape model cannot be obtained from the mold shape model. Information on the convex portion having such a curvature is obtained when searching for the convex portion, and by taking the convex portion having the curvature thus obtained into consideration when creating the relief processing data, the relief portion having high reliability can be obtained. Processing data can be created.

According to the CAM system for escaping the die non-molding portion according to the present invention, the automatic escaping means retrieves all the fillet information from the die shape model and retrieves the die shape model. For each fillet, calculate the direction of the line connecting the centers of curvature radius, and if it is not parallel to the direction of the line connecting the centers of curvature radius and the pressing direction of the mold, it is orthogonal to the line connecting the centers of curvature radius. The inner product of the vector in the pressing direction of the die and the vector in the direction of the center of the radius of curvature is calculated from points other than the ends on the specified edge extending in the direction along the plane, and this inner product exceeds zero. In that case, the fillet is determined to be a convex portion, and when the inner product is zero or less, the fillet is determined to be a concave portion. As described above, when the relief processing data is created, by determining the recesses and protrusions based on the fillet information obtained from the mold shape model, the recesses and protrusions are automatically searched for these recesses and protrusions. Since it is not necessary to search for the concave portion and the convex portion, the time for searching the concave portion and the convex portion can be shortened, and thus the time for creating the relief processing data can be shortened.

According to the CAM system for automating the die non-molding part release processing according to the present invention, the automatic relief processing means retrieves all the fillet information from the die shape model and retrieves the die shape model. For each fillet, calculate the direction of the line connecting the centers of curvature radius, and if the direction of the line connecting the centers of curvature radius is parallel to the pressing direction of the die, the vertical direction of the three-dimensional coordinate system of the CAM system The direction opposite to the direction is defined as the die pressing direction, and one of the edges extending in the direction along the plane orthogonal to the line with the center of the radius of curvature having the larger value in the vertical direction of the three-dimensional coordinate system of the CAM system is selected. Take out, from a given point on this edge,
Calculate the inner product of the vector in the existing side of the curved surface adjacent to the edge and the vector in the direction of the center of the radius of curvature.If this inner product exceeds zero, the fillet is determined as a convex portion, and if the inner product is less than zero, Determines that the fillet is a recess.
In this case, since the fillet in which the direction of the line connecting the centers of the radius of curvature and the pressing direction of the die are parallel is also taken into consideration when creating the escape processing data, the search time for the concave portion and the convex portion is further shortened, and therefore, It is possible to further reduce the time for creating the escape processing data.

According to the CAM system for automating the die non-molding portion relieving process according to the fifth aspect of the present invention, the automatic relieving process means, when selecting the shortest distance, the curvature of each fillet of the retrieved die shape model. Extract a foot curve that is a line that connects the end points of the patch line in the direction of the line that connects the radius centers. Next, the distance between the foot curve of the fillet determined as a concave portion and the foot curve of the fillet determined as a convex portion, the distance between the foot curve of the fillet determined as a concave portion and the convex portion excluding the fillet determined as a convex portion , Or a distance between one of a plurality of contact points for a tool having a predetermined diameter in the vicinity of the concave portion determined to be the concave portion and the foot curve of the fillet determined to be the convex portion. In this way, by calculating the distance by using the foot curve, the distance calculation can be simplified, so that the time for creating the relief processing data can be further shortened.

According to the CAM system for automating the die non-molding portion relieving process according to the sixth aspect of the present invention, the automatic relieving means has a predetermined diameter with respect to the concave portion for which the automatic relief processing is determined. Omit processing with a tool of less than diameter. By omitting such machining, it is possible to further shorten the processing time of the mold when performing relief processing.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a CAM system for automating a mold non-molding portion according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a configuration diagram functionally showing the configuration of a CAM system as an embodiment of a CAM system for automating the mold non-molding part escape processing according to the present invention. The CAM system shown in the figure modifies the operation program of a normal CAM system, and at the modified part, automatically determines the part to be escaped from the die shape model and automatically outputs the escape processing data. The function according to the present invention created in FIG.

As shown, this CAM system
A non-molding part escape processing part 3 having a shape feature automatic extraction part 1 as a concave / convex automatic search means and an escape processing part determination part 2 as an automatic escape processing determination means, and a tool path calculation part as tool processing omission means. 4 and.

The shape feature automatic extraction unit 1 of the non-molding portion escape processing unit 3 uses the mold shape data 5 forming the mold shape model.
Based on the data supplied from the region data 6 having data on the region to be machined by a tool having a predetermined diameter and the region to which the relief process is not applied, the convex part of the mold shape and the concave part narrowed more than a predetermined value. Data is created and output to the concave / convex data 7. Relief processing part determination unit 2
Is based on the data supplied from the concave / convex data 7 and the relief processing reference information 8 containing the reference information on whether or not to perform the relief processing in the recess in the mold shape.
Data of a relief processing application portion for performing relief processing with a tool having a predetermined diameter is created and output to the processing portion support data 9.

As shown in FIG. 2 (a), the tool path calculation unit 4 is based on the data supplied from the processing portion support data 9 and, as shown in FIG. 2 (a), when performing relief processing with a tool T1 having a predetermined diameter, By determining a predetermined escape amount d for the recess,
As shown in (b), a route for performing relief processing by the tool T1 is calculated, and it is output as NC data 10.

Specifically, the CAM system of this embodiment is
As the shape feature automatic extraction unit 1, the processing program shown in FIG. 3 is executed. In this program, first step 11
Then, from the die shape data 5 (FIG. 1), the data of the die shape model created by the CAD system, and from the area data 6 (FIG. 1), the data of the area where the die should be machined with a tool having a predetermined diameter. Respectively.

Then, in step 12, data is taken out for one of the ridgelines that make up the mold shape model, and in the next step 13, as shown in FIG. Two adjacent curved surfaces (including planes) F of the mold shape model are cut along one or a plurality of normal planes P to create cross-section lines L for each normal plane P, and in the next step 14, , A portion between the ridgelines passing through the ridgeline E of the two disconnection planes L in the normal plane, where the crossing angle α outside the shape model is equal to or less than the specified angle, is a concave portion and a convex portion (in FIG. Only the concave portion C having a part is shown) and the data of the concave portion and the convex portion are output to the concave portion and the convex portion data 7 (FIG. 1) sequentially and repeatedly by the number of ridge lines. The upper convex portion B and the lower portion in FIG. Extracts all concave portions and convex portions such as recesses C of, accommodated in the recess their recess and data of the protrusions and the protrusions data 7 (Fig. 1).

Here, when the sphere having a radius of curvature equal to the radius of the tool having the maximum diameter is brought into contact with the angular tangent line of the two section lines L, the specified angle is surrounded by the sphere and the two tangent lines. The relief processing standard information 8 (FIG. 1) is specified as an angle such that the area to be covered exceeds a predetermined allowable amount, and in step 14, the designated angle is escape processing standard information 8 (FIG. 1). Reading from.

Next, here, in step 15, data is taken out for one of the curved surfaces forming the mold shape model, and in step 16 next, as shown in FIG. A plurality of curves G that are constant parameter lines in the curved surface (curves obtained by changing one of the two parameters u and v expressing the curved surface when the other is constant)
And in the next step 17, a sphere having a specified radius of curvature is brought into contact with each curve G so that the sphere is in contact with the curve G at two contact points outside the shape model and between the contact points. When the area surrounded by the curve G and the sphere exceeds a predetermined allowable amount, a process of limiting the section of the curve between the contact points and the minimum curvature on the curve G in the limited section in the next step 18 Process for determining the point of
The process of determining the point of the minimum curvature and the next step 19
And a process of connecting the points of the minimum curvature with respect to the plurality of curves G to take out the convex portion B and the concave portion C, and outputting the data of the concave portion and the convex portion to the concave portion and convex portion data 7 (FIG. 1). By sequentially performing the above procedure for the number of curved surfaces, all the concave portions and the convex portions are extracted, and the data of the concave portions and the convex portions are stored in the concave portion and the convex portion data 7 (FIG. 1).

Here, the designated radius of curvature is designated as a value equal to the radius of the tool having the maximum diameter in order to make the reference equal to that of the concave portion, and is recorded in the relief machining reference information 8 (FIG. 1). In step 17, the designated radius of curvature is read from the escape processing reference information 8 (FIG. 1).

Further, the CAM system of this embodiment executes the processing program shown in FIG. 5 as the relief processing portion determining section 2. In this program, first, in step 21, a region to which relief machining is not applied (hereinafter referred to as a relief machining non-application region) is read from the region data 6 (FIG. 1). Next, at step 22, the concave data extracted by the processing program of FIG.
It is read from (FIG. 1), and in the next step 23, it is inspected whether or not the escape processing non-applied portion read in step 21 intersects or includes the concave portion data.

Next, in step 24, the recess data outside the relief processing non-applied area is taken out as the relief processing non-applied portion, and in the next step 25, a mold shape model is constructed as shown in FIG. 6 (a). Mold shape data 5
Based on the data from (FIG. 1) and the data of the tool model of the predetermined diameter from the escape processing standard information 8 (FIG. 1),
In the vicinity of the recess data obtained by removing the recess data existing in the escape processing non-applied portion from the retrieved recess data, the tool T2
Searches for a position having a plurality of contacts D1, D2.

Then, in step 26, as shown in FIG.
As shown in (b), contact point D1 retrieved in step 25
And D2 and the closest points B1 and B2 between the convex data read from the concave and convex data 7 (FIG. 1) are calculated, and the contact points D1 and D2 and the concave and convex data 7 (FIG. 1) obtained in step 25 are calculated. ), The shortest distances X1 and X2 among the distances to all the convex portions housed in (1) are respectively obtained. Here, the shortest distance X1 is the linear distance between the contact point D1 and the closest point B1, but in the case of the closest point B2 of the convex portion data having a curvature, the shortest distance X2 is the convex point having a curvature with the contact point D2. It is assumed that the radius of curvature R of the convex portion is subtracted from the straight line distance from the closest point B2 which is the center point of the sectional curve of the portion.

The convex portion data having such a curvature is obtained when the die itself has a curvature. Therefore, by considering the convex portion having such a curvature, which cannot be obtained from the data forming the mold shape model but is obtained when searching the convex portion, at the time of creating the processed portion instruction data 9 (FIG. 1). The highly reliable processed portion instruction data 9 (FIG. 1) can be created.

Next, at step 27, it is judged if the shortest distance X1 or X2 is longer than the escape processing judgment distance. This escape processing determination distance is set to the minimum required distance for preserving the convex shape during die molding. Shortest distance X
When it is determined that 1 or X2 is longer than the relief processing determination distance, in step 28, the relief processing application flag is set for the recess point C1 which is the point data forming the recess data. On the other hand, the shortest distance X1 or X2
When it is determined that is shorter than the relief processing determination distance, the process returns to step 25 and the processing program is executed for the next concave point data. These steps 25 to 28 are sequentially and repeatedly performed by the number of recess point data, and the range formed by the recess point data for which the flag is set is taken out as a relief processing application site, and this is processed site support data 9 (Fig. Output to 1). Note that steps 25 to 28
Is sequentially repeated for each concave data, and the number of concave data is repeated, and steps 22 to 29 are sequentially repeated for the concave data.

As described above, the shortest distance among the distances between the contact points D1 and D2 and the convex portion point C1 for the tool having a predetermined diameter in the vicinity of the searched concave portion is equal to or larger than the predetermined relief machining determination distance. Since it is automatically determined whether or not there is a relief processing application site based on whether or not there is a relief processing, it is possible to perform the relief processing with an NC machine tool, and the operator's hand about the above-mentioned non-molding part of the NC machined die. It is possible to eliminate the need for removal by work, reduce the machining time of the mold, and allow the operator to perform relief processing for each convex portion when creating the machining site support data 9 (FIG. 1). The determination of suitability is omitted, and thus the man-hours for creating escape processing data can be reduced.

In the CAM system of this embodiment, FIG.
As shown in (a), the tool path calculation unit 4 (FIG. 1) firstly determines the tool with the maximum diameter based on the data for the recesses for automatic relief processing supplied from the processing portion support data 9 (FIG. 1). Processing by T4 is performed, and then FIG. 14 (d)
As shown in, the tool T5 having a diameter smaller than that of the tool T4 is used for machining, and a route in which machining with a tool having a diameter smaller than that of the tool T5 is omitted is calculated.
It is output as 0 (FIG. 1). By omitting such processing, it is possible to further reduce the processing time of the mold when performing the relief processing.

FIG. 7 is a flow chart when the fillet is taken into consideration when operating the CAM system for automating the mold non-molding part escape processing according to the present invention. In this program, first, in step 31, the mold shape data 5 (FIG. 1) forming the mold shape model, and the area data 6 (FIG. 1) having the data on the area to be machined by the tool having the predetermined diameter. A fillet within a specified radius of curvature range to be described later is searched based on the data supplied from

Next, in step 32, the unevenness of each fillet retrieved in step 31 is determined, and the determined concave ridge line portion fillet and convex ridge line portion fillet are stored in the concave / convex data 7 (FIG. 1). In addition, the steps 31 and 32 are performed by the non-molding portion escape processing portion 3 (FIG. 1).
The shape feature automatic extraction unit 1 (FIG. 1) is executed.

Next, at step 33, a foot curve which is a line connecting the end points of the patch line in the direction of the line connecting the centers of curvature radii of the concave ridge line portion fillet is taken out, and then,
In step 34, the foot curve of the convex ridge line part fillet is taken out, and then the shortest distance is obtained using the foot curve taken out in steps 33 and / or 34, and whether or not the shortest distance is shorter than the relief processing determination distance. Depending on whether or not the relief machining application site by a tool having a predetermined diameter is determined, the escape machining application site is output to the machining site support data 9. It should be noted that steps 33 to 35 are performed by the escape processing portion determining unit 1 (FIG. 1) of the non-molding portion escape processing unit 3 (FIG. 1).
Run as.

Next, at step 36, the tool path calculation unit 4 (FIG. 1) calculates the NC data 1 based on the data from the processing portion support data 9 (FIG. 1).
The relief processing applied portion of the concave ridge line portion fillet output to 0 is trimmed, and then, in step 37, the relief processing shape is given to the portion where the hole is formed by the trimming with a tool having a predetermined diameter and a predetermined diameter. Create and exit this program.

FIG. 8 is a flow chart for retrieving a concave ridge line portion fillet and a convex ridge line portion fillet executed by the CAM system of this embodiment. This program corresponding to steps 31 and 32 of the flow chart of FIG. It is executed as the shape feature automatic extraction unit 1 (FIG. 1) of the non-molded portion escape processing unit 3 (FIG. 1), and first, step 41
Then, the data of the fillet curved surface is extracted from the mold shape data 5 (FIG. 1) forming the mold shape model.

Next, at step 42, it is judged whether or not the extracted fillet plane is within the specified radius of curvature range. If it is determined that the radius of curvature is within the specified radius of curvature range, the next step 43 calculates the direction of the radius of curvature center. On the other hand, when it is determined that the radius of curvature is not within the specified radius of curvature range, the process returns to step 41 and the processing program is executed for the next fillet curved surface.

Also in this case, the designated radius of curvature is designated as a value equal to the radius of the tool having the maximum diameter in order to make the standard equal to that in step 17 of FIG. 3, and the relief machining standard information 8 (FIG. 1). In step 17, the designated radius of curvature is released and processing standard information 8 (FIG. 1) is recorded.
Reading from.

After calculating the direction of the line connecting the centers of curvature radius in step 43, in step 44, it is determined whether the pressing direction of the die is parallel to the direction of the line connecting centers of curvature radius of the fillet curved surface. to decide. In this embodiment,
Vertical direction (Z-axis direction) of the three-dimensional coordinate system of the CAM system
The direction (-Z axis direction) opposite to is the pressing direction of the mold.

When the pressing direction of the die and the direction of the line connecting the centers of the radius of curvature of the fillet curved surface are not parallel, FIG.
As shown in (a), from a point other than the end points on a predetermined edge existing in a direction orthogonal to the line connecting the centers of curvature of the fillet curved surfaces, a vector H1 in the pressing direction of the die is obtained.
, H2 and the vectors R1 and R2 in the direction of the radius of curvature of the fillet curved surface are calculated, and it is determined whether or not the inner product exceeds 0. In FIG. 9A, a press direction vector H1 and a curvature radius center direction vector R1 at a point E1 on a predetermined edge of the convex ridge line portion fillet 61.
If the included angle between and is θ ₁ , then the inner product M1 of these is

[Equation 1] M1 = | H1 || R1 | cos θ ₁ Since 0 ° <θ ₁ <90 °, the inner product M1
Becomes positive, and in step 46, the convex ridge line portion fillet 61 is registered in the concave portion and convex portion data 7 (FIG. 1), and this program ends.

On the other hand, in FIG. 9A, when the included angle between the vector H2 in the pressing direction and the vector R2 in the direction of the radius of curvature at the point E2 on the predetermined edge of the concave ridgeline fillet 62 is θ ₂ , The inner product M2 of these is

[Expression 2] M2 = | H2 || R2 | cos θ ₂ Since 90 ° <θ ₂ <180 °, the inner product M2 becomes negative, and in step 47, the concave ridge line portion fillet 62 is registered in the concave / convex data 7 (FIG. 1), and this program ends.

When the pressing direction of the mold and the direction of the line connecting the centers of the radius of curvature of the fillet curved surface coincide with each other in step 44, the center of the radius of curvature is determined in step 48 as shown in FIG. 9B. Of the edges extending in the direction along the plane orthogonal to the continuous line (hereinafter referred to as the v direction), the one having the larger value in the Z-axis direction is taken out, and then in step 49, the curved surface adjacent to the taken out edge. Take out.

Next, at step 50, the inner product of the vectors R3 and R4 in the direction of the radius of curvature center and the vectors K1 and K2 in the direction of the existing side of the curved surface adjacent to the edge is calculated, and it is determined whether this inner product exceeds 0 or not. to decide. FIG.
In (b), if the included angle between the vector K1 in the existing direction of the curved surface adjacent to the edge at the point E3 on the edge of the convex ridge line portion fillet 63 and the vector R3 in the direction of the center of the radius of curvature is θ ₃ , the inner product M3 of these is given. Is

[Expression 3] M3 = | K1 || R3 | cos θ ₃ Since θ ₃ becomes almost 0 °, the inner product M3 becomes positive, and in step 51, the convex ridge line portion fillet 6
3 is registered in the concave / convex data 7 (FIG. 1), and this program ends.

On the other hand, in FIG. 9B, the included angle between the vector K2 on the side where the curved surface adjacent to the edge at the point E4 on the edge of the concave ridge fillet 64 and the vector R4 in the direction of the radius of curvature is defined as Assuming θ ₄ , the inner product M4 of these is

## EQU4 ## M4 = | K2 || R4 | cos θ ₄ Since θ ₄ is approximately 180 °, the inner product M4
Becomes negative, and in step 51, the concave ridge line portion fillet 64 is registered in the concave portion and convex portion data 7 (FIG. 1), and this program ends.

Here, the points E1 to E4 on the edge are arbitrary points which are predetermined by the operator before the start of this program, but it is preferable that this is the midpoint of the edge.

This program is executed between step 14 and step 15 of the processing program of FIG. 3, whereby the fillet obtained from the data 5 (FIG. 1) constituting the mold shape model when the relief machining data is created. A concave ridge line portion fillet and a convex ridge line portion fillet are created based on the information. Therefore, for the concave ridge line portion fillet and the convex ridge line portion, it is not necessary to search the concave portion and the convex portion by the shape feature automatic extraction unit 1, so that the search time for the concave portion and the convex portion is shortened, and the processed portion supporting data 9 ( (Fig. 1)
Reduce the time to create.

FIG. 10 is a flowchart executed by the CAM system of the present embodiment to automatically determine the relief processing parts of the concave ridge line portion fillet and the convex ridge line portion fillet, and steps 33 to 3 of the flow chart of FIG.
This program corresponding to 5 is executed as the escape processing portion determining unit 2 (FIG. 1) of the non-molding portion escape processing unit 3 (FIG. 1). First, at step 71, as shown in FIG. The ridge line portion fillet 81 is used as the concave and convex data 7.
(Fig. 1).

Next, at step 72, foot curves 82 and 83 which are curves in the direction in which the end points of the patch lines in the v direction of the extracted concave ridge line portion fillet 81 are connected (hereinafter referred to as u direction) are taken out, The foot curve is approximated by a point sequence.

Then, in step 73, as shown in FIG.
As shown in (b) and (c), a foot curve in the u direction, which is a point sequence approximation of the concave ridge line fillet (foot curves 84 and 85 in FIG. 11 (b), foot curve 86 in FIG. 11 (c), 87) and a foot curve in the u direction of all the convex ridge line part fillets (foot curve 8 in FIG. 11B).
8 and 89, and foot curves 90 and 91 are shown in FIG. ) With X3 and X4, respectively.

Next, at step 74, it is judged whether or not the distances X3 and X4 calculated at step 73 are longer than the relief machining judgment distance. This relief processing determination distance is also set to the minimum required distance for saving the convex shape during die molding, as in the program of FIG. When it is determined that the distance X3 or X4 is longer than the escape processing determination distance, in step 75, the escape is made to the point of the determined point sequence of the concave ridge line portion fillet 84, 85, 86, 87 which is approximated by the point sequence. Set the processing applied flag. On the other hand, when it is determined that the distance X3 or X4 is shorter than the escape processing determination distance, the process returns to step 73 and the processing program is executed for the next point. These steps 73-
75 is repeated sequentially and by the number of points in the point sequence, and the range formed by the point sequence data with the flag set is
As shown in FIG. 11C, the escape processing application site 92 is taken out, and this is processed site instruction data 9 (FIG. 1).
Output to

In this program, step 73
To 75 are repeated sequentially for each u-direction foot curve and for the number of points in the point curve of the predetermined concave ridge line part fillet in the u-direction, and steps 72 to 75 are sequentially performed for each concave ridge part fillet. Repeat a predetermined number of foot curves in the u direction of the concave ridgeline fillet, and repeat steps 71 to 76 sequentially and for the number of concave ridgeline fillets in the mold shape model.

This program is executed for the case where the relief processing application site is determined between the concave ridge line portion fillet and the convex ridge line portion fillet, but the concave ridge line portion fillet and the convex portion other than the convex ridge line portion fillet are The determination is made by calculating the distance between the point of the point sequence of the foot curve in the u direction of the concave ridge fillet and the closest point of the convex data. On the other hand, when determining between the concave portion other than the concave ridge line portion fillet and the convex ridge line portion fillet, one of a plurality of contact points with the tool in the vicinity of the concave data and the u direction of the convex ridge line portion. It is judged by calculating the distance between the foot curve.

As described above, when the relief processing data is created, the relief processing application site of the convex ridge line portion fillet and the concave ridge line portion fillet is created based on the fillet information obtained from the data 5 constituting the mold shape model. By this, since the search for the concave ridge line portion fillet and the convex ridge line portion fillet is omitted, the search time for the concave portion and the convex portion is further shortened and the distance calculation is simplified. Further reduce the creation time.

FIG. 12 is a flowchart for creating a relief shape for a concave ridge line portion fillet and a convex ridge line portion fillet, which is executed by the CAM system of the present embodiment when a mold shape is created. This program corresponding to steps 36 to 37 is executed by the tool path calculation unit 4 (FIG. 1), and first, step 10
In step 1, the relief processing application portion is taken out from the processing portion instruction data 9 (FIG. 1).

Then, in step 102, the process shown in FIG.
As shown in (a), for each of the extracted relief processing application sites, a corresponding concave ridge line portion fillet is searched, and the concave ridge line portion fillets are trimmed at the edges of the relief processing application site 111, respectively. ), The hole 112 is formed.

Then, in step 103, as shown in FIG.
As shown in (c), the intersections 115 and 116 of the relief processing application portion 113 of the concave ridge portion fillet and the relief processing application portion 114 of another concave ridge portion fillet are calculated, and in the next step 104, the concave ridge portion is calculated. It is determined whether the edges of the fillet relief processing application portion have intersections.

When the intersection points 115 and 116 are provided as shown in FIG. 13 (c), the relief processing application site 114 is formed.
Is divided into sections 114a, 114b and 114c,
In the next step 106, in each of the divided sections, as shown in FIG. 13D, a relief shape 116 is created in the formed hole 115 with a tool T6 having a predetermined diameter and having a corresponding shape, Quit this program.

The creation of the relief shape in step 106 after dividing the relief processing application site in step 105 will be described in more detail with reference to FIG. 13C. Relief with a tool of diameter
The relief machining is sequentially performed on 4c with a tool having a predetermined diameter, and finally, the relief machining on the section 114c is performed by interpolating the relief machining application portion 114 and the sections 114a and 114c.

In step 104, when the edges of the relief applying portion of the concave ridge portion do not have an intersection, in step 106, as shown in FIG. , The relief shape 116 is created by the tool T6 having a predetermined diameter having a corresponding shape, and the program is terminated.

It should be noted that step 106 is repeated for each relief processing application site sequentially and by the number of divisions of the escape processing site, and steps 101 to 106 are repeated sequentially and by the number of escape processing application sites.

Although the preferred embodiments of the present invention have been described above with reference to the drawings, those skilled in the art can easily make various changes and modifications.

[Brief description of drawings]

FIG. 1 is a configuration diagram functionally showing the configuration of a CAM system as an embodiment of a CAM system according to the present invention.

FIG. 2A is a diagram showing how to determine a relief amount when performing a relief process with a tool, and FIG. 2B is a diagram showing a path through which a relief process is performed with a tool.

FIG. 3 is a flowchart showing an operation as a shape feature automatic extraction unit of the CAM system of the above embodiment.

4 (a) and 4 (b) are explanatory diagrams showing a method of extracting a concave portion and a convex portion by the CAM system of the above-described embodiment.

FIG. 5 is a flowchart showing an operation as a relief processing portion determination unit of the CAM system of the above embodiment.

6 (a) and 6 (b) are explanatory views showing a method of determining relief processing by the CAM system of the above embodiment.

FIG. 7 is a flow chart when a fillet is taken into consideration when operating the CAM system according to the present invention.

FIG. 8 is a flowchart for searching a concave ridge line portion fillet and a convex ridge line portion fillet executed by the CAM system of the present embodiment.

9A and 9B are explanatory diagrams showing an automatic search method for a concave fillet and a convex fillet by the CAM system of the above embodiment.

FIG. 10 is a flowchart that is executed by the CAM system of the present embodiment to automatically determine the relief processing parts of the concave ridge line portion fillet and the convex ridge line portion fillet.

11A to 11C are CAMs of the above embodiment.
It is explanatory drawing which shows the determination method of the relief process with respect to the concave ridge line part fillet by a system.

FIG. 12 is a flowchart for creating a relief shape of a concave ridge line portion fillet and a convex ridge line portion fillet, which is executed by the CAM system of the present embodiment.

13A to 13C are CAMs of the above embodiment.
It is explanatory drawing which shows the relief | relief shape creation method of a concave ridge part fillet and a convex ridge part fillet by a system.

14 (a) to 14 (c) are diagrams for explaining the processing of the recess, and FIG. 14 (d) is a diagram for explaining the processing of the uncut portion and the relief processing of the recess.

[Explanation of symbols]

1 Shape Feature Automatic Extraction Section 2 Relief Machining Area Determining Section 3 Non-Molding Section Relief Machining Section 4 Tool Path Calculation Section 5 Mold Shape Data 6 Area Data 7 Recessed and Convex Data 8 Relief Processing Standard Information 9 Machining Site Support Data 10 NC Data 61,63 Convex ridge part fillet 62,64,81 Concave ridge part fillet 82,83,84,85,86,87,88,89,9
0,91 u-direction foot curve 92,111,113,114 Relief processing application site 112,117 Hole 115,116 Intersection point 114a, 114b, 114c Section 118 Relief shape B Convex portion B1, B2 Closest point C Recess C1 Recess point d Relief point Quantity E Edge line E1, E2, E3, E4 Edge point F Curved surface G Curve K1, K2 Vector on the side where the curved surface adjacent to the edge is present L Section line P Normal plane R Radius of curvature R1, R2, R3 R4 Vector of curvature radius center direction H1, H2 Vector of press direction T1, T2, T3, T4, T5, T6 Tool X1, X2 Shortest distance X3, X4 Distance α Crossing angle θ ₁ , θ ₂ Vector of curvature radius center direction Included angle between press direction vector

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[Procedure amendment]

[Submission date] July 5, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

13A to 13D are CAMs of the above embodiment.
It is explanatory drawing which shows the relief | relief shape creation method of a concave ridge part fillet and a convex ridge part fillet by a system.

Claims (6)

[Claims] 1. A mold shape model formed by a free-form surface is used to determine a portion to which relief processing with a tool having a predetermined diameter is applied from the shape, and to release the portion with the tool having the predetermined diameter. In a CAM system for machining, a concave portion and a convex portion automatic searching means for searching all of the convex portion and the concave portion narrowed more than a predetermined value from the mold shape model, and the predetermined portion for each concave portion of the searched mold shape model. A tool having a diameter is brought into contact with the vicinity of the concave portion to search the positions of the plurality of contact points with respect to the tool having the predetermined diameter in the vicinity of the concave portion, and for each of the searched plurality of contact points, between the convex portion. When each of the distances are calculated, the shortest distance among these calculated distances is selected, and the shortest distances obtained for the plurality of contacts are all equal to or more than a predetermined distance,
A CAM system for automated escape processing of a non-molding part of a mold, comprising: an automatic escape processing determining means that determines to automatically perform escape processing for the recess. 2. The automatic relief processing determining means, when the convex portion has a curvature, calculates the difference between the distance between the contact point and the center point of the sectional curve of the convex portion and the radius of curvature of the convex portion. The CAM system for automation of escape processing of a non-molding portion of a mold according to claim 1, wherein the distance is calculated as a distance between the contact point and the convex portion. 3. The concave and convex automatic search means searches all the fillet information from the mold shape model, and for each fillet of the searched mold shape model, the direction of the line connecting the centers of curvature radii. If it is not parallel to the direction of the line connecting the centers of the radius of curvature and the pressing direction of the mold, then on a predetermined edge extending in the direction along the plane orthogonal to the line connecting the centers of the radius of curvature. From the point other than the end, calculate the inner product of the vector in the pressing direction of the mold and the vector in the direction of the radius of curvature center, and if this inner product exceeds zero, determine the fillet as a convex portion, The CAM system for automation of mold non-forming part escape processing according to claim 1 or 2, wherein the fillet is determined to be a recess when the inner product is not more than zero. 4. The concave / convex automatic search means searches all the fillet information from the mold shape model, and for each fillet of the searched mold shape model, the direction of a line connecting the centers of curvature radii. When the direction of the line connecting the centers of the curvature radii and the pressing direction of the mold are parallel to each other, the direction opposite to the vertical direction of the three-dimensional coordinate system of the CAM system is the pressing direction of the mold. Of the edges extending in the direction along the plane orthogonal to the line connecting the centers of the radii of curvature, the one having the larger value in the vertical direction of the three-dimensional coordinate system of the CAM system is taken out, and a predetermined point on this edge is extracted. From, the inner product of the vector in the existing direction of the curved surface adjacent to the edge and the vector in the radius center direction is calculated, and if this inner product exceeds zero, the fillet is determined to be a convex portion. Characterized in that said determining the fillet recesses and when the inner product is zero or less, the mold unmolded part relief CAM system for processing automation according to any of claims 1 to 3. 5. The automatic relief processing means connects the end points of the patch line in the direction of the line connecting the centers of the curvature radii of the fillets of the searched mold shape model when selecting the shortest distance. Taking out the foot curve which is a line, the distance between the foot curve of the fillet determined to be the concave portion and the foot curve determined to be the convex portion, the foot curve of the fillet determined to be the concave portion and the fillet determined to be the convex portion. Characterized in that the distance between the excluding convex portion, or the distance between the contact point and the foot curve of the fillet determined as the convex portion is obtained.
The CAM system according to claim 3 or 4, wherein the mold non-molding portion is escaped automatically. 6. A tool machining omitting means for omitting machining with a tool having a diameter smaller than the predetermined diameter for a concave portion for which the automatic relief machining determining means has decided to perform the automatic relief machining. C for automatic release of die non-molding portion according to any one of claims 1 to 5, characterized in that
AM system.