JP3488968B2 - Method for creating NC machining data of vanishing model for casting - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a full molding method,
That is, it relates to the manufacturing technology of the disappearing model used in the casting method of pouring the molten resin as it is to obtain the casting without taking out the foamed resin model filled in the mold. The present invention relates to a method for creating NC machining data for a lost model for casting, which is used for NC machining from a block.

[0002]

2. Description of the Related Art In order to perform NC processing of a vanishing model for a full mold casting method as described above from a foam resin block,
There is a method of cutting based on NC processing data obtained by scanning the entire processing range of a block made of foamed resin, for example, styrofoam. In addition, there is a method in which the entire processing range is appropriately divided and pocket processing is performed based on the NC processing data obtained for each division.

Further, in order to reduce the amount of cutting in one operation to enable high-speed feed, a slicing process in which a part deeper than a certain depth is cut in multiple times is applied, that is, the entire processing range is scanned. After obtaining the NC data to be machined, the NC data between the specified depths h1 and h2 is taken out, and the part cut by the deeper h2 is escaped to a safe height where the tool of the NC machining device leaves the foam resin block. There is a method to create and connect data.

[0004]

However, in any of the above-described NC machining data creating methods, in any case, the scanning machining cutting path intersects the vertical surface of the model such as the rib or wall. In the part to be cut, a part where the cutting tool of the NC processing device does not reach is generated between the adjacent cutting paths, which causes uncut residue called cusp. Therefore, this uncut residue is manually removed after NC processing. There is a problem that it is necessary to solve such a problem, in order to reduce the number of man-hours when NC processing the disappearance model for full mold casting, and to reduce the manufacturing cost of the disappearance model made of foamed resin. It was a challenge.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in NC machining of a cast casting disappearance model, and is capable of NC machining a casting disappearance model having a vertical surface with no uncut residue. It is an object of the present invention to provide a method for creating NC machining data of a casting disappearance model that does not require manual removal of the uncut portion and can significantly reduce the manufacturing cost of the casting disappearance model.

[0006]

[0007]

According to a first aspect of the present invention, there is provided a method for preparing NC machining data for a cast disappearance model in which the vertical portion is removed from the NC data for scanning the entire machining range of the foamed resin block. After obtaining the divided cutting paths that are divided by the vertical part and are parallel to each other at a predetermined distance, the end points of the adjacent divided cutting paths are sequentially connected by the connection cutting path having the length within the predetermined connection range. To form the first scan cutting path, and the start point of the unconnected divided cutting path separated from the end point of the obtained scan cutting path beyond the connecting range and the end point of the scan cutting path are tools of the NC processing apparatus. Is connected through a moving path that escapes until it is separated from the foamed resin block, and is also unconnected next to the divided cutting path connected by the moving path. The processing path for the foamed resin block is repeated by sequentially connecting the split cutting paths with the connection cutting path having the length within the connection range to form the next scan cutting path until there are no unconnected divided cutting paths. In a method for creating NC machining data of a lost model for casting to obtain the following, each wall-cutting path in which the end points located on the vertical side of the end points of each divided cutting path in each scan cutting path are connected at the shortest distance The NC machining data creation method for a lost model for casting according to claim 2 of the present invention is characterized in that it is added before or after the cutting pass, and the same machining data creation method is used for the NC machining data creation method. When connecting the end points located on the vertical part side of the end points with the connecting cutting path, the vertical of the previous divided cutting path In order to solve the above-mentioned conventional problems, the present invention is characterized in that a wall surface cutting path that goes back to a side end point is added to the connection cutting path, and such a structure in the NC machining data creation method of the cast model disappears. Is used as a means.

Further, the NC of the disappearance model for casting according to the present invention
As an embodiment of the processing data creation method, in the NC processing data creation method of the lost model for casting according to claim 3,
The NC according to claim 4, which has a configuration in which a portion deeper than a certain depth is divided into a plurality of times to obtain a machining path, and also as an embodiment.
The processing data creating method is characterized in that scanning is performed in a direction that intersects obliquely with the wall surface of the casting disappearance model formed from the foamed resin block.

[0009]

[0010]

In the method for creating NC machining data of a cast model for casting according to the first aspect of the present invention, NC data for scanning the entire working range of the foamed resin block, which is the material of the cast model, is obtained, The divided cutting paths obtained by removing the vertical portion are sequentially connected by connection cutting paths having a length within a predetermined connection range to form a first scanning cutting path, and the first scanning cutting path is obtained from the end point of the obtained scanning cutting path. Find an unconnected split cutting path that is separated beyond the connection range, and connect the start point and the end point of the scan cutting path through a moving path that allows the tool of the NC processing device to escape to a safe distance, and The unconnected divided cutting paths adjacent to the connected divided cutting paths are similarly sequentially connected by the connected cutting paths having the length within the connection range, and the next scan is performed. Since the processing path for the foam resin block is obtained by repeating the process of forming the cutting path until there are no unconnected divided cutting paths, the same level among the divided cutting paths divided by the vertical part is obtained. As a result of preferentially connecting adjacent ones at a position to form one scan cutting path, there is no cutting path that crosses the vertical part (uneven part), and the vertical cutting path becomes the minimum necessary It reduces unnecessary machining and unnecessary movement of cutting tools. Then, before or after the scan cutting path obtained in this way, a wall surface cutting path in which the end points located on the vertical portion side of each divided cutting path are connected by the shortest distance is added, so that it disappears. The uncut residue generated on the vertical surface of the model is automatically scraped off by the wall surface cutting pass.

According to a second aspect of the present invention, there is provided a method for creating NC machining data of a lost model for castings, which is a method for preparing a machining path for a foamed resin block by the same method as described above, in which divided cutting paths adjacent to each other are used. When connecting end points on the vertical part side with a connection cutting path,
Since the wall cutting pass that goes back to the vertical side end point of the previous split cutting pass is added, similarly, the vertical cutting pass is reduced and unnecessary movement of the cutting tool and unnecessary machining are reduced. The uncut material generated on the vertical surface of the disappearing model will be automatically deleted by the wall cutting pass.

As an embodiment of the NC machining data creating method for a cast cast vanishing model according to the present invention, in the data creating method according to claim 3, a portion deeper than a certain depth is divided into a plurality of machining paths to obtain a machining path. Therefore, even when processing a large disappearing model, the cutting speed becomes fast, and in the method for creating NC machining data for a disappearing model for casting according to claim 4 as an embodiment, the cutting model is applied to the wall surface of the disappearing model. Since it scans in a direction that intersects diagonally, the wall deformation during machining is less than when the cutting process is parallel to the wall surface. The dimensional accuracy of is improved.

[0013]

[0014]

As described above, since the method for creating NC machining data of a cast model according to claim 1 of the present invention has the above-mentioned structure, the divided cutting paths divided by the vertical portion are adjacent to each other at the same level position. As a result of each scan cutting path being formed by preferentially connecting objects, the vertical cutting path can be minimized, and wasteful machining and movement by the cutting tool are reduced to shorten the machining time. In addition, the uncut residue generated on the vertical surface of the lost model is automatically scraped off by the wall-cutting pass, which eliminates the need for manual finishing and reduces the man-hours for manufacturing the lost model. The excellent effect of being able to greatly reduce the manufacturing cost of such a lost model for casting is brought about.

According to a second aspect of the present invention, there is provided an NC machining data creation method for a cast model, wherein a machining path for a foamed resin block is obtained by the above construction, that is, the same method as the data creation method according to the second aspect. Since the connection cutting path that connects the end points located on the vertical part side of the split cutting path, the wall cutting path that goes back to the end point on the vertical part side of the previous split cutting path and returns is added. It is possible to reduce unnecessary machining and movement due to the reduction of machining time, and it is also possible to reduce the number of man-hours required for manufacturing lost models by eliminating the need for manual cutting and finishing of uncut parts. The same effect as the data creating method according to claim 2 that the manufacturing cost of the vanishing model can be greatly reduced is brought about.

In the data creating method according to claim 3 as an embodiment of the NC machining data creating method of the disappearance model for casting according to the present invention, a machining path is obtained by dividing a portion deeper than a certain depth into a plurality of parts. Therefore, even when a large disappearing model is machined, the feed rate can be made high to improve the machining efficiency. Similarly, in the NC machining data creating method of the disappearing model for casting according to claim 4 as an embodiment, Since the scan is performed in the direction that intersects the wall surface of the disappearing model at an angle, it is possible to prevent the deformation of the wall surface during processing even when the wall thickness is thin, and to improve the dimensional accuracy of the disappearing model for casting. The more excellent effect that it can be improved is brought about.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

1 to 12 illustrate an embodiment of a method for creating NC machining data of a cast model according to the present invention. FIG. 1 shows a method for creating NC machining data according to the present invention. It is a flowchart which shows the data creation process at the time of applying to the slice processing which cuts a part deeper than a depth in multiple times.

First, in step 100 in the flow chart shown in FIG. 1, scan data creation conditions such as scan pitch and scan direction, and slice conditions such as the initial depth h1 and slice pitch dh are input, and the concatenation condition, that is, concatenation is performed. Input the range L (maximum distance when connecting the divided cutting paths at the same level position).

Next, in step 101, a scan path is calculated on the basis of the input scan data creation conditions, for example, a calculation for NC machining the vanishing model M having the target shape as shown in FIG. A scan path shown by a broken line in FIG. 3 is obtained.

Next, in step 102, as shown in FIG. 4, the data between the first depths h1 and h2 (= h1 + dh), that is, the data of the machining range of the first stage, is obtained from the obtained scan path. After taking out, in step 103, the portions cut out at the depth h2 are connected by a straight cutting path L. At this time, the initial depth h1 is slightly smaller than the maximum height of the scan path (for example, 0.01).
(mm), processing of the uppermost surface can be omitted (the material surface of the foamed resin block can be used as it is), and as shown in FIG. 5A, it is arranged in parallel at the pitch input in step 100. The division cutting path D is obtained. In addition, in FIG. 5A, a small circle mark attached to the end of each divided cutting path D indicates the vertical portion V.

Then, in step 104, the divided cutting paths D which are not connected in order are searched from the first divided cutting path D1, and when there is an unconnected divided cutting path D, the process proceeds from step 105 to step 106, and The divided cutting path D found in step S1 is moved to step 107 as the connected cutting path i (= i + 1), and if the divided cutting path D has a vertical portion V, the vertical portion V is removed from the divided cutting path D in step 108. As a new divided cutting path D, and the divided cutting path D with the vertical portion V removed
After storing the end point positions (Pj, Qk) of
Move to 09. If there is no vertical portion V in the divided cutting path D, the process skips step 108 and proceeds from step 107 to step 109.

In step 109, it is determined whether or not there is a concatenated cutting path (i-1) and i is 2 or more, that is, a scan cutting path A connecting the divided cutting paths D is already formed as described later. If i is 2 or more, the process proceeds from step 109 to step 110, and in step 110, the end point and the connection cutting path i of the connection cutting path (i-1) previously formed are After the start point and the starting point are connected by the moving path T that has escaped to the safe height, the process proceeds to step 111. On the other hand, if i is smaller than 2, that is, if the scan cutting path A described later has not been formed yet, the process skips step 110 and proceeds from step 109 to step 111.

In step 111, the adjacent divided cutting paths D are searched for those whose horizontal distance to the connected cutting path i is within the connecting range L input in step 100 and within the specified connecting range L. If there is a divided cutting path D in the distance, the process proceeds from step 112 to step 113, and it is determined whether or not the divided cutting path D has a vertical portion V. If the divided cutting path D has a vertical portion V, in step 114, the same processing as in step 108 is performed, that is, the vertical portion V is removed from the divided cutting path D to obtain a new divided cutting path D.
The end point position (P of the divided cutting path D with the vertical portion V removed)
j, Qk) is stored and the process proceeds to step 115. If there is no vertical portion V in the divided cutting path D, step 1114 is skipped and step 112 is followed by step 115.

In step 115, the connection cutting path i
Of the divided cutting path D found and the starting point of the found divided cutting path D are connected by a connecting cutting path C (which naturally has a length within the connecting range L) to form a new connected cutting path i, and then step 1
Returning to 11, the connection range L for the new connection cutting path i
The division cutting path D within the distance is determined. That is,
The processing from step 111 to step 115 is repeated until there is no new divided cutting path D within the distance within the predetermined connection range L, and the divided cutting paths D are sequentially connected while removing the vertical portion V so that continuous scanning is performed. The cutting path A is formed.

When the divided cutting path D disappears within the distance within the predetermined connecting range L, steps 112 to 116.
Then, in step 116, it is judged whether or not there is an end point in which the vertical portion is removed from the divided cutting path D, that is, whether or not the end point positions Pj and Qk are stored. If the end point position is stored, it is determined in step 116. After proceeding from 116 to step 117, the wall surface cutting path W that connects the end points P1 to Pj and Q1 to Qk at the shortest distance is obtained, and the new cutting path i is added to the scan cutting path A. The data Pj and Qk are cleared and the process returns to step 104. If the end point position is not stored, the process returns from step 116 to step 104 without executing step 117 and step 118, and the processes of step 104 to step 118 are performed until the unconnected divided cutting paths D are completely eliminated. Repeatedly, scan cutting path A and wall surface cutting path W,
Moving path T connecting these to the next scan cutting path A
Are formed one after another.

The process up to this point will be specifically described for the disappearance model M shown in FIGS. 2 and 3. First, FIG.
When it is determined in step 105 that the first divided cutting path D1 in (a) is not connected, this divided cutting path D1 is connected cutting path 1 in step 106.
(See FIG. 5B).

Since there is no vertical portion V in this divided cutting path D1, the step 108 is skipped and the process proceeds from step 107 to step 109, in which i is 2
It is determined whether or not the above. In this case, since it is the first process and only the concatenated cutting path 1 has been formed (i = 1), the process skips step 110 and proceeds to step 111. Within steps 111 and 112, within the predetermined concatenated range L. A split cutting path D2 is found as a split cutting path at a distance of.

Since the divided cutting path D2 also has no vertical portion V, it skips step 114 and proceeds from step 113 to step 115. In step 115, the end point of the connected cutting path 1 and the start point of the divided cutting path D2 are connected to each other. Connected by a connecting cutting path C having a length within L,
As shown in FIG. 5C, the combined cutting path 1 (divided cutting path D1), the connected cutting path C, and the divided cutting path D2 are combined to form a new combined cutting path 1.

Then, returning to step 111, the divided cutting path D3 is found as a divided cutting path located within the predetermined connecting range L, and the same processing in steps 111, 112 and 115 is repeated, As shown in FIG. 6A, the divided cutting paths D3 and D4 are further connected to form a new connected cutting path 1.

When connecting the next divided cutting path D5, since there is a vertical portion V in this divided cutting path D5, the routine proceeds from step 113 to step 114, and step 1
In step 14, the vertical portion V is removed, and the end point position P1 on the vertical portion side of this divided path cutting path D5 is stored. Then, in step 115, a new divided cutting path in which the end point of the connected cutting path 1 and the vertical portion V are removed The start point of D5 is connected by the connection cutting path C, and steps 111 to 115 are repeated to sequentially connect the divided path cutting paths D6, D7, ..., Dm-2, Dm-1, and then, as shown in FIG. ) As shown in FIG. At this time, the end point positions P2, P3, ..., Pj-1, Pj on the vertical portion side of each of the divided path cutting paths D6 to Dm-1 are stored.

As shown in FIG. 6B, the divided cutting path D
When a continuous connection cutting path 1 from 1 to Dm-1 is formed, there is no division cutting path D within a predetermined connection range L from this connection cutting path 1, so step 1
The process proceeds from 12 to step 116. That is, the first scan cutting path A1 is formed by the connecting cutting path 1 from the divided cutting path D1 to the divided cutting path Dm-1.

At step 116, since the end point positions P1 to Pj from which the vertical portion has been removed are stored, the routine proceeds to step 117, where end points Pj and Pj as shown in FIG. 6 (c).
-1, ..., P2, P1 are connected in this order to form a wall surface cutting path W1 and connected to the scan cutting path A1 to make a new connected cutting path 1. Then, in step 118, the end point position data P1 to Pj are cleared. Then, step 104
Return to.

In steps 104 and 105, the divided cutting path Dm is found as an unconnected divided cutting path, and in step 106, this divided cutting path Dm is set as the connected cutting path 2. This division cutting path Dm
Has a vertical portion V, the process moves from step 107 to step 108, the vertical portion V is removed from the divided cutting path Dm to form a new divided cutting path Dm, and the removed end point position on the vertical portion side is P1. Then, in step 109, it is determined whether i is 2 or more.

Since the connected cutting path 1 has already been formed and the connected cutting path 2 (i = 2) is present this time, step 11
7A, as shown in FIG. 7A, the end point of the connected cutting path 1, that is, the end point of the wall surface cutting path W1 connected to the scan cutting path A1 and the start point of the divided cutting path Dm from which the vertical portion V is removed. Are connected by a moving path T which is released to a safety height where the tool of the processing device is separated from the foamed resin block of the material, and then the process proceeds to step 111.

In steps 111 and 112, the divided cutting path Dm + 1 is found as a divided cutting path located within the connecting range L, and the vertical portion is removed in step 114, and then the connected cutting path 2 ( The divided cutting path Dm) and the connection cutting path C are connected to form a new connection cutting path 2.

Hereinafter, step 111 to step 11
By repeating step 5, the vertical portion V is removed, and the removed end portions P1, P2, ..., Pj-1, Pj on the vertical portion side are removed.
Each divided cutting path D is connected while memorizing j
A new connected cutting path 2 is formed by sequentially connecting with each other, and by connecting up to the final divided cutting path Dn-1 located within the predetermined connecting range L, as shown in FIG. 7 (b). A second scan cutting path A2 is formed.

Then, in step 117, as shown in FIG.
As shown in (c), the stored end point positions Pj, Pj-1,
…, P2, P1 are connected in this order in the wall cutting path W2
Is connected to the scan cutting path A2 to make a new connected cutting path 2, and in step 118, the end point position data P1 ...
After clearing Pj, the process returns to step 104.

After this, from step 104 to step 1
The processing of 18 is similarly repeated, and as shown in FIGS. 8A to 8C, divided cutting paths Dn, Dp, Dq are sequentially found as unconnected divided cutting paths (steps 104 and 105). , Each of which is connected by the moving path T (step 110), and then the scan cutting path A
3, A4, A5 (steps 111 to 114) and wall surface cutting paths W3, W4, W5 (step 117) are formed, and as shown in FIG. 9, the creation of the machining data of the first stage is completed.

The above-mentioned scan cutting paths A3, A
4 and A5, the vertical part V is attached to both ends of each divided cutting path D.
The formation of the wall surface cutting path W when there is
As shown in (a), the end point positions on one side of each divided cutting path D are sequentially set to P1, P2, P3, ..., Pj-1, Pj, and the end point positions on the other side are Q1, Q2, Q3 ,. Qk-
The values are stored as 1 and Qk, respectively, and when the end point E of the connected cutting path comes to one side as shown in FIG.
As shown in FIG. 10B, the clockwise direction in the figure, that is, Pj, Pj-1, ..., P3, P2, P1, Q1, Q2.
, Q3, ..., Qk-1, Qk are connected in this order to obtain the wall surface cutting path W. On the contrary, when the end point E of the connected cutting path comes to the other side, the counterclockwise direction in the drawing, that is, Qk, Q
k-1, ..., Q3, Q2, Q1, P1, P2, P3, ...,
The wall surface cutting path W is obtained by connecting Pj-1 and Pj in this order.

When all the first-stage divided cutting paths D have been connected and the first-stage NC machining data has been created, the process proceeds from step 105 to step 119, where h2 exceeds the maximum depth of the scan-path data. Whether or not it is necessary, that is, the necessity of creating the processed data in the second stage is determined. If h2 does not exceed the maximum depth, then in step 120, 2
The current value of h2 is changed to new h
After setting to 1, the process returns to step 102, and the creation of the second stage machining data is started.

That is, in the case of the vanishing model M shown in FIG. 2, in step 102, the depths h1 and h2 (= h1
The data between + dh) is extracted as shown in FIG. 11, and the divided cutting path D is obtained as shown in FIG.

Then, step 104 to step 11
By repeating the process up to 8, the divided cutting pass D
Are sequentially connected while their vertical portions V are removed, as shown in FIG.
As shown in (b), the scan cutting paths A6, A7, A8 and the wall surface cutting paths W6, W7, W8 connected by the moving path T are similarly formed.

When all the divided cutting paths D of the second stage are connected, the process proceeds from Steps 104 and 105 to Step 119. In the vanishing model M of the size shown in FIG. 2, h2 is the scan path data at this point. Since the maximum depth is exceeded, the process proceeds from step 119 to step 121, and the creation of the NC processed data for the disappearance model M is completed.

Of course, when the disappearance model M is larger, h1 is sequentially updated in step 120, and h2 is updated.
The processing from step 102 to step 120 is repeated until (= h1 + dh) exceeds the maximum depth of the scan path data, and the processed data from the third stage to the final stage are similarly created.

As described above, according to the method for creating the NC machining data of the disappearance model according to this embodiment, the wall surface cutting path W is added after each scan cutting path A, so that there is no uncut left vertical wall surface. It is possible to automatically cut a vanishing model for casting equipped with, and it is not necessary to finish by hand, and the manufacturing cost of this type of vanishing model can be greatly reduced.

FIGS. 13 to 18 show another embodiment of the NC machining data preparation method for a cast model according to the present invention, and FIGS. 13 and 14 show NC machining data preparation according to the embodiment. It is a flowchart which shows a process.

In this embodiment, in contrast to the first embodiment in which the wall surface cutting path is added after each scan cutting path is obtained by connecting the respective divided cutting paths, each of the divided cutting paths is added. When the paths are connected, a wall surface cutting path that returns to the vertical end side end point position of the previous divided cutting path is added, and basically the same method as the previous embodiment except the timing of this wall surface cutting path connection. A scan cutting path is formed by. Therefore, here, the difference from the first embodiment will be mainly described.

In the flowcharts shown in FIGS. 13 and 14, the scan path is calculated in step 201 based on the condition input in step 200,
As a result of the processing of steps 202 and 203, FIG.
A divided cutting path D similar to that in (a) is obtained. Then, the divided cutting path D first found in step 206
After 1 is set as the connection cutting path 1 (see FIG. 5B), the start points R0 of the divided cutting paths D2 to D4 and the end points of the connection cutting path 1 found in steps 211 and 212 are determined in step 218. The connection cutting path C is sequentially connected to form a new connection cutting path 1 (FIG. 6).
(See (a)).

Next, when the divided cutting path D5 is found as the divided cutting path D within the connecting range L in steps 211 and 212, since the divided cutting path D5 has the vertical portion V, in step 214. After the vertical portion V is removed and the starting point side end point position R1 and the ending point side end point position S1 of the divided cutting path D5 are stored, it is judged at step 215 whether or not j is larger than 2, and at this time point j is Since it is still only “1”, the process proceeds to step 218, and as shown in FIG. 15A, the end point of the concatenated cutting path 1 and the start point R of the divided cutting path D5.
The connection cutting path C between 1 and 1 is obtained and connected, and as a new connection cutting path 1, the process returns to step 211.

In steps 211 and 212, the divided cutting path D6 is set as the divided cutting path D within the connecting range L.
Is found, the vertical part V is also included in this split cutting path D6.
Therefore, the vertical portion V is removed in step 214, the starting point side end point position R2 and the ending point side end point position S2 of the divided cutting path D6 are stored, and then it is determined in step 215 whether j is larger than 2. It At this time, since j is still “2”, the process proceeds to step 218, and as shown in FIG. 15B, the connection cutting path C is connected between the end point of the connected cutting path 1 and the start point R2 of the divided cutting path D6.
After connecting with each other to form a new connected cutting path 1, the process returns to step 211.

When connecting the next divided cutting path D7,
Similarly, in step 214, the vertical portion V is removed,
After the start point side end point position R3 and the end point side end point position S3 of the divided cutting path D7 are stored, it is judged in step 215 whether j is larger than 2. At this time, since j is "3", the process proceeds to step 216. However, since neither the end point position R1 (Rj-2) nor the end point position S2 (Sj-1) is the end point where the vertical portion V is removed, step 216 Then, the process proceeds to step 218, and as shown in FIG. 15C, the connection cutting path C is used to connect the end point of the connection cutting path 1 and the start point R3 of the divided cutting path D7 to form a new connection cutting path 1. , And returns to step 211.

When connecting the next divided cutting path D8, the vertical portion V is similarly removed in step 214, the starting point side end point position R4 and the ending point side end point position S4 of the divided cutting path D8 are stored, and then step At 215, it is determined whether or not j is larger than 2, and j is "4".
Therefore, the process proceeds to step 216. And the end point position R
Since 2 (Rj-2) is the end point from which the vertical portion V has been removed, the process proceeds from step 216 to step 217, as shown in FIG.
As shown in (a), in step 217, after obtaining the wall surface cutting path W between the connection cutting path 1 and the end point R2 and adding it to the connection cutting path 1 to make a new connection cutting path 1,
Further, in step 218, the end point of the connected cutting path 1 and the starting point R4 of the divided cutting path D8 are connected by the connecting cutting path C to form a new connected cutting path 1, and step 211
Return to.

In this way, by repeating the processing from step 211 to step 218, as shown in FIG.
As shown in (b), when all the divided cutting paths from D1 to Dm-1 are connected, there is no divided cutting path D within the connection range L, so that the process proceeds from step 212 to step 219. Since j is larger than 1, the process proceeds from step 219 to step 220, but the divided cutting path D
Since neither the end point of m-1 nor the end point of the previous divided cutting path Dm-2 is the end point from which the vertical portion V has been removed, step 2
From 20 to step 222, the end point position information is cleared (j = 0), and then the process returns to step 204.

In steps 204 and 205, the divided cutting path Dm is searched for as an unconnected divided cutting path, the divided cutting path Dm is set as the connected cutting path 2 in step 206, and then the vertical portion V is removed in step 208. At the same time, after the starting point side end point position and the ending point side end point position of the divided cutting path Dm are stored, in step 210, the moving path T in which the end point of the connected cutting path 1 and the start point of the new connected cutting path 2 are released to a safe height.
After connecting by, go to step 211. Then, while searching for the unconnected divided cutting path D, the divided cutting path D is sequentially connected by the connection cutting path C and the wall surface cutting path W as necessary, whereby the disappearance model M
NC processing data of is similarly created.

Next, a vertical portion V is provided at both ends of each divided cutting path D.
The case where there is a case will be described based on FIGS. 17 and 18.

First, in steps 204 and 205, the divided cutting path D1 is searched for as the first divided cutting path, and in step 206 this divided cutting path D1 is set as the connection cutting path 1. Then, in step 208, the vertical portion V is removed. Then, the starting point side end point position R1 and the ending point side end point position S1 of the divided cutting path D1 are stored.

Then, step 210 is skipped (i =
1) Remove the vertical portion V of the divided cutting path D2 found in steps 211 and 212, store the start point side end point position R2 and end point side end point position S2 in step 214, and then execute steps 216 and 217. Jumping (j = 2), in step 218, a connection cutting path C between the end point of the connection cutting path 1 and the start point R2 of the divided cutting path D2 is obtained and connected, and a new connection cutting is performed as shown in FIG. 17 (a). Step 1 for pass 1
Return to 1.

When the next divided cutting path D3 is found as the divided cutting path D located within the predetermined connecting range L in steps 211 and 212, step 21
In step 4, the vertical part V of the split cutting path D3 is removed,
The start point side end point position R3 and the end point side end point position S3 are stored. Then, the process proceeds from step 215 to step 216 (j = 3), where the end point positions R1 (Rj-2) and S2 (S
Since all j-1) are end points from which the vertical portion V has been removed, the process proceeds from step 216 to step 217, and as shown in FIG. 17B, the wall surface cutting between the connection cutting path 1 and the end point R1 (Rj-2). After obtaining and connecting the path W to make a new connected cutting path 1, in step 218, a connection cutting path C between the end point of the new connected cutting path 1 and the starting point R3 of the divided cutting path D3 is further obtained and connected. The process returns to step 211 as a new connected cutting pass 1.

By repeating the processing from step 211 to step 218 in this way, when all the divided cutting paths from D1 to Dj are connected as shown in FIG. 18A, within the predetermined connection range L. Since there are no divided cutting paths D at a distance, steps 212 to 2
Move to 19. Then, the process proceeds from step 219 to step 220. Since both the end point Rj-1 of the divided cutting path Dj-1 and the end point Sj of the divided cutting path Dj are the end points from which the vertical portion V has been removed, the steps 220 to 2
As shown in FIG. 18B, after proceeding to 21, a wall cutting path W between the end point of the connected cutting path 1 and the end point Rj-1 is obtained and connected to form a new connected cutting path 1, In step 222, the end point position information is cleared (j
= 0), and the process returns to step 204.

That is, according to the method for creating the NC machining data of the disappearing model according to this embodiment, when each divided cutting path D is connected through the connection cutting path C, the vertical portion side of the previous divided cutting path D is connected. Since the wall surface cutting path W returning to the starting point is added, similar to the first embodiment,
It is possible to automatically cut a lost model for casting having a vertical wall surface without leaving uncut residue, and it is not necessary to finish by hand, so that the manufacturing cost of the lost model can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a flow chart showing a procedure for creating NC processing data in a first embodiment of a method for creating NC processing data for lost model for casting according to the present invention.

FIG. 2 is a perspective view showing a shape example of a vanishing model to be processed and a scan path calculated based on the shape.

3 (a) and 3 (b) are respectively a plan view and a front view of the vanishing model and scan path shown in FIG.

FIG. 4 is a step 102 of the flowchart shown in FIG.
5 is a schematic diagram illustrating a process of extracting the processing range data of the first stage in steps 103 and 103. FIG.

5 (a) to 5 (c) are explanatory views of a procedure for creating NC processed data according to the flowchart shown in FIG.

6A to 6C are explanatory views showing a procedure for creating NC processed data according to the flowchart shown in FIG. 1 following FIG. 5;

7 (a) to 7 (c) are explanatory views showing a procedure for creating NC processed data according to the flowchart shown in FIG. 1 following FIG.

8A to 8C are explanatory views showing a procedure for creating NC processed data according to the flowchart shown in FIG. 1 following FIG.

FIG. 9 is an explanatory diagram showing a state of completion of creation of first-stage processed data according to the flowchart shown in FIG. 1;

10 (a) and 10 (b) are explanatory views showing a procedure for connecting divided cutting paths having vertical portions at both ends according to the flowchart shown in FIG.

FIG. 11: Step 10 of the flowchart shown in FIG.
It is a schematic diagram explaining the processing which takes out the processing range data of the 2nd step in 2 and 103.

12 (a) and 12 (b) are explanatory views showing a procedure for creating the NC processed data of the second stage according to the flowchart shown in FIG.

FIG. 13 is a flow chart showing a procedure for creating NC processing data in the second embodiment of the method for creating NC processing data for lost model for casting according to the present invention.

FIG. 14 is a flowchart following the procedure of FIG. 13 for creating NC processing data in the second embodiment of the method for creating NC processing data for lost model for casting according to the present invention.

15 (a) to (c) are explanatory views of a procedure for creating NC processed data according to the flowcharts shown in FIGS. 13 and 14. FIG.

16 (a) to 16 (c) are explanatory views showing a procedure for creating NC processed data according to the flowcharts shown in FIGS. 13 and 14, following FIG.

17 (a) to (c) are explanatory views showing a connecting procedure of divided cutting paths having vertical portions at both ends according to the flowcharts shown in FIGS. 13 and 14. FIG.

18 (a) and 18 (b) are explanatory views showing a procedure for connecting divided cutting paths having vertical portions at both ends thereof, following FIG. 17 according to the flowcharts shown in FIGS. 13 and 14.

[Explanation of symbols]

V vertical part D (D1, D2, D3, ...) Divided cutting path L connection range C connection cutting path A (A1, ..., A8) Scan cutting path T movement pass W (W1, ..., W8) Wall cutting path

Claims (4)

(57) [Claims] 1. A vertical cutting portion is removed from NC data for scanning the entire processing range of a foamed resin block to obtain divided cutting paths which are divided by the vertical portion and are arranged in parallel at a predetermined distance. The end points of the adjacent divided cutting paths are sequentially connected by the connecting cutting path having the length within the predetermined connecting range to form the first scan cutting path, and the connecting range is defined from the end point of the obtained scan cutting path. The start point of the unconnected split cutting path that is separated beyond and the end point of the scan cutting path are connected via a moving path that allows the tool of the NC processing device to escape until it is separated from the foam resin block, and are also connected by the moving path. The unconnected divided cutting paths adjacent to the divided cutting path are sequentially connected by the connected cutting path having the length within the connection range, and the next skip In the NC machining data creation method of the lost model for casting, which obtains the machining path for the foamed resin block by repeating the process of forming the cutting path for cutting until there are no unconnected division cutting paths, A method for creating NC machining data of a lost model for casting, characterized in that a wall surface cutting path in which the end points located on the vertical portion side among the end points of (1) are connected at the shortest distance is added before or after each scan cutting path. 2. After removing the vertical portion from the NC data for scanning the entire processing range of the foamed resin block to obtain a divided cutting path which is divided by the vertical portion and is arranged in parallel at a predetermined distance, The end points of the adjacent divided cutting paths are sequentially connected by the connecting cutting path having the length within the predetermined connecting range to form the first scan cutting path, and the connecting range is defined from the end point of the obtained scan cutting path. The start point of the unconnected split cutting path that is separated beyond and the end point of the scan cutting path are connected via a moving path that allows the tool of the NC processing device to escape until it is separated from the foam resin block, and are also connected by the moving path. The unconnected divided cutting paths adjacent to the divided cutting path are sequentially connected by the connected cutting path having the length within the connection range, and the next skip In the NC machining data creation method of the lost model for casting, in which the machining path forming process is repeated to obtain the machining path for the foamed resin block by repeating the process of forming uncut division cutting paths, among the end points of the division cutting paths adjacent to each other. When connecting end points located on the vertical portion side of the connecting cutting path with a connecting cutting path, a wall surface cutting path that goes back to the vertical side end point of the previous divided cutting path and returns is added to the connecting cutting path How to create NC processing data of disappearance model. 3. The NC machining data creation method according to claim 1, wherein the machining path is obtained by dividing a portion deeper than a certain depth into a plurality of times. 4. A method for creating NC machining data for vanishing model according to claim 1 or 2, wherein scanning is performed in a direction diagonally intersecting a wall surface of the vanishing model for casting formed from a foamed resin block. .