JPH10283009A - Automatic generating method, device for machine tool track for rough working, and recording medium recording automatic generating program for machine tool track for rough working - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically generate the working track of fixed stack removal concerning method, device for automatically generating the track of machine tool for roughly working a metal die material through an NC working machine and a computer readable recording medium recording an automatic generation program for this track. SOLUTION: Concerning this method, a moving track 3 of fixed stack removal is automatically generated by offset from a metallic die material form 6 without offset from an outline 2 of metallic die product form 1. Beside, circular arcs 7 and 8 are added to the approach part or retract part of the moving track 3. Further, circular arcs 10 and 11 also cover both the end parts, approach part and retract part of the moving track inside a recessed part 9 of metallic die product form 1. By adopting such a generating method, the moving track 3 of fixed stack removal is generated, working load is fixed and working time is shortened. Further, the moving track of machine tool not to generate interference on an x-y plane is calculated and the machine tool is moved on the x-y plane so that the working time can be further shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for automatically generating a tool path for roughly machining a die material by an NC processing machine, and a computer-readable recording medium storing an automatic generation program for the path. .

[0002]

2. Description of the Related Art In recent years, in order to shorten a mold making period, a cutting process is being applied to a mold using a high-hardness material such as a cast and forged part or plastic in place of the conventional electric discharge machining. As one of the excellent processing methods for roughing a die material made of such a high-hardness material by an NC processing machine, a large roughing / cutting gulling processing method as shown in FIG. 25 is known. This processing method is described first in FIG.
As shown in FIG. 25 (A), processing is performed in a large step shape (1) and (2) at the maximum cutting edge length that can be processed by the processing tool 5 (large rough processing step), and then, as shown in FIG. The stairs are machined from bottom to top (3) to (6) in small steps (scratching on the chip) as described in JP-A-8-126950 and JP-A-8-86. 155788). According to this processing method, the processing time can be reduced to about half and the life of the tool can be greatly extended.

[0003]

The essential conditions of the tool trajectory for realizing rough machining of high-hardness materials, such as the above-mentioned rough machining and chipping, are to maintain a constant machining load, That is, the removal allowance (cutting allowance) is made constant. However, in order for the NC machine to draw a tool trajectory satisfying such conditions in conventional roughing using the NC machine, a skilled designer relies on a long-term experience and intuition to program the machining trajectory. I had to do it.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and a method and an apparatus for automatically generating a tool trajectory for roughing which can automatically generate a machining trajectory with a fixed machining allowance, and roughing. It is an object of the present invention to provide a recording medium in which a program for automatically generating a tool trajectory is recorded.

[0005]

The simplest and simplest method of generating a machining path with a fixed machining allowance is to use a machining center along an outer shape 2 of a die product shape 1 to be machined as shown in FIG. Is to offset the movement trajectory 3. However, in this case, in the portion of the concave polygonal line portion 4, FIG.
As shown in (A), the load on the tool 5 becomes extremely large.
In order to reduce this load, there is a method in which an arc is formed in the portion of the concave broken line portion 4. However, even if the arc is formed, as shown in FIG. Its effect is small.

Therefore, in the present invention, as shown in FIG. 22, (a) the offset is not made along the outer shape 2 of the die product shape 1 but from the die material shape 6.
(B) (C) Circular arcs 7 and 8 are formed on the approach portion and the retract portion of the movement locus 3. (D) The concave portion 9 of the mold product shape 1
By performing processing such as applying arcs 10 and 11 to both end portions of the movement trajectory 3 in the inside, a movement trajectory with a fixed allowance is generated.

Further, conventionally, as shown in FIG. 23, when the tool 5 is moved between the cutting parts, a method of once pulling up and moving in the z-axis (up and down) direction has been used. Since the speed is reduced at the approach part of the next cutting part, the processing efficiency is deteriorated. Therefore, in the present invention, as shown in FIG. 24, a movement trajectory that does not cause interference (such as collision) on the xy plane is calculated, and the tool 5 is moved on the xy plane. .

That is, the method for automatically generating a tool path for roughing according to the present invention provides a die product shape,
An input step of inputting machining conditions necessary for trajectory generation such as a mold material shape, a radius of a tool to be used, a cutting pitch of the tool, and a step of obtaining a convex polygon connecting convex vertices of the mold product shape, Find the maximum value of the shortest distance between the convex polygon obtained in the process and the component point of the mold material shape, and a component point that gives the maximum value by dividing the maximum value by the cutting pitch of the tool. A step of calculating the number of cuts between the convex polygon, a step of generating a cutting trajectory for the number of cuts on the outer periphery of the convex polygon based on the number of cuts calculated in the step, After offsetting each of the extracted cutting trajectories by the cutting pitch of the tool, only the trajectory included in the mold material shape is extracted for each of the offset trajectories, and the extracted trajectories are defined by the tool radius. Off by minutes And performing a cutting process to take out the outer shape of the convex polygon as a movement trajectory for the outer region of the convex polygon, and generating an offset shape of the die product shape by offset processing the outer shape of the die product shape outward by a tool radius. Offsetting the convex polygon outward by a difference between a tool radius and a tool pitch to generate an offset shape of the convex polygon; and the mold having the offset shape of the convex polygon obtained in the step. A step of taking out only the line portion that protrudes from the offset shape of the product shape and taking it out as a movement trajectory of the concave portion surrounded by the convex polygon and the mold product shape, and the convex polygon taken out as described above By combining the movement trajectory for the outer region and the movement trajectory of the concave portion surrounded by the convex polygon and the mold product shape, a fixed allowance is obtained as a movement trajectory. Was constructed and an output step of outputting.

In the above configuration, a step of performing an arc processing on at least an approach portion of a movement trajectory of the generated outer region of the convex polygon is added, or
Adding a step of performing arc processing on both ends of the movement trajectory of the generated convex polygon and the concave portion surrounded by the mold product shape, and furthermore, moving the tool between the cutting parts on the xy plane. It is more desirable to perform the above.

In addition, the automatic tool path generating apparatus for roughing according to the present invention, based on the above-mentioned design concept, generates a path such as a die product shape, a die material shape, a radius of a tool to be used, and a cutting pitch of a tool. Input means for inputting the processing conditions necessary for, and means for obtaining a convex polygon connecting the convex vertices of the mold product shape,
Find the maximum value of the shortest distance between the obtained convex polygon obtained by the means and the constituent point of the mold material shape, and divide the maximum value by the cutting pitch of the tool to give the maximum value. Means for calculating the number of cuts between the convex polygon, and means for generating a cutting locus for the number of cuts on the outer periphery of the convex polygon based on the number of cuts calculated by the means, the means After offsetting each of the generated cutting trajectories outward by the cutting pitch of the tool, only the trajectories included in the mold material shape are extracted for each of the trajectories subjected to the offset processing, and the extracted trajectories are extracted from the tool. Means for offsetting outward by a radius and taking out the movement trajectory for the outer region of the convex polygon; and offsetting the outer shape of the die product shape outward by the tool radius to obtain a die product shape. To generate a set shape,
Means for offset processing the convex polygon outward by the difference between the tool radius and the tool pitch to generate an offset shape of the convex polygon, and the mold product having the offset shape of the convex polygon obtained by the means Means for taking out only the line portion protruding from the offset shape of the shape and taking it out as a movement locus of the concave portion surrounded by the convex polygon and the mold product shape, and the outside of the convex polygon taken out as described above An output means for outputting a fixed trajectory by combining the trajectory of the region with the trajectory of the concave portion surrounded by the convex polygon and the mold product shape.

In the above configuration, means for performing arc processing on at least the approach portion of the movement trajectory of the generated outer region of the convex polygon is added, or
Means for performing arc processing on both ends of the movement trajectory of the generated convex polygon and the concave portion surrounded by the mold product shape is further added, and further, the movement of the tool between the cutting parts is performed on the xy plane. It is more desirable to perform the above.

Further, the recording medium in which the program for automatically generating a tool path for roughing processing according to the present invention is recorded includes a procedure for obtaining a convex polygon connecting convex vertices of a mold product shape under the above-mentioned design concept; Find the maximum value of the shortest distance between the obtained convex polygon obtained in the above procedure and the constituent point of the mold material shape, and divide the maximum value by the cutting pitch of the tool to give the maximum value. And a procedure for calculating the number of cuts between the convex polygon, and a step of generating a cutting locus for the number of cuts on the outer periphery of the convex polygon based on the number of cuts calculated in the step, After offsetting each of the generated cutting trajectories outward by the cutting pitch of the tool, only the trajectories included in the mold material shape are extracted for each of the trajectories subjected to the offset processing, and the extracted trajectories are extracted from the tool. Outside by radius A step of taking out a movement locus of the outer region of the convex polygon offset process,
Offset the outer shape of the die product shape by the tool radius to generate an offset shape of the die product shape, and offset the convex polygon outward by the difference between the tool radius and the tool pitch. A step of generating an offset shape of a shaped polygon, and extracting only the line portion of the mold product shape of the offset shape of the convex polygon obtained in the step, which is outside the offset shape, to obtain the convex polygon and the metal. A procedure of extracting the movement trajectory of the concave portion surrounded by the mold product shape, a movement trajectory for the outer region of the convex polygon extracted as described above, and the movement trajectory surrounded by the convex polygon and the mold product shape. And an output procedure for outputting a fixed trajectory by combining the trajectory of the concave portion.

In the above-mentioned configuration, a procedure for performing an arc process on at least an approach portion of a movement trajectory of the generated outer region of the convex polygon is added, or
A procedure for performing arc processing on both ends of the movement trajectory of the generated convex polygon and the concave portion surrounded by the mold product shape is further added, and further, the movement of the tool between the cutting parts is performed on the xy plane. It is more desirable to perform the above.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of an automatic generation device for a tool path for roughing according to the present invention. In the figure, 101 is a central processing unit (CPU), 102 is a main memory storing a program for automatically generating a tool path for roughing processing, 103 is a data memory for storing input processing conditions and the like, and 104 is processing conditions. An input device for inputting information such as input, 105 is an output device for outputting the generated tool path data for roughing, and 106 is a display device.

Next, with reference to FIG. 2 to FIG. 20, an operation of automatically generating a tool path for roughing processing will be described. FIG.
Is a flowchart of an operation for automatically generating a tool trajectory for roughing, and FIGS. 3 to 20 are schematic explanatory diagrams of tool trajectory generation. Note that, in these figures, FIGS.
The same or corresponding parts as in FIG. 7 are denoted by the same reference numerals.

First, prior to the start of processing, the input device 104
Input the machining conditions necessary for locus generation, such as the product shape of the mold, the shape of the mold material, the radius of the tool to be used, the cutting pitch of the tool, the arc (round) dimension of the concave portion, and the position of the cutting start point (see FIG. 2). Step S1). The input processing condition data is stored in the data memory 103. When a processing start command is given from the input device 103, the CPU 10
1. Under the control of a program for automatically generating a tool path for roughing machining stored in the main memory 102, while reading machining condition data required for processing from the data memory 103, the automatic Start generation.

(1) Calculation of a convex polygon connecting the convex vertices of the mold product shape The CPU 101 first reads the mold product shape 1 and the material shape 4 as shown in FIG.
As shown in (2), a convex polygon 21 connecting the convex vertices of the mold product shape 1 is obtained (step S2). This convex polygon 21
It can be obtained by the following calculation.

That is, when each vertex position of the mold product shape 1 is a to g, a point where the value of x is the minimum among the points a to g (if there are a plurality of points having the same value of x, Of the convex polygon is determined as the starting point (0, 0) of the convex polygon. Then, the point a and all the other points b to g are connected by a line segment, and the angles (counterclockwise) between the obtained line segments and the y-axis are obtained, respectively. The smallest point b is selected, and the point b and the point a are connected. Next, using the connected point b as a base point, the point b and all the other points a and c to g are connected by line segments, and each obtained line segment is connected to the point a → obtained in the previous processing. An angle (counterclockwise) between the line segment b and the line segment b is obtained, a point c having the smallest angle is selected from these angles, and the point c and the point b are connected. By repeating such an operation until reaching the starting point a, a convex polygon 21 connecting points a → b → c → e → f → g → a is obtained as shown in FIG. By obtaining the convex polygon 21 wrapped by connecting the convex vertices of the mold product shape 1 in this manner, it is easy to generate a trajectory having a fixed allowance, and the calculation time is shortened, and the concave which takes a long time for cutting is required. Shaped parts can be eliminated.

(2) Calculation of the maximum value of the shortest distance between the convex polygon and the constituent points of the mold material shape Once the convex polygon 21 has been obtained, as shown in FIG. Constituent points a, h, i, g and convex polygon 21
Find the shortest distance between and the maximum value of these shortest distances,
That is, in the case of the illustrated example, the distance between the constituent point h and the perpendicular hc connecting the line segment b → c of the convex polygon 21 is set to the maximum shortest distance between the constituent point of the mold material shape 4 and the convex polygon 21. It is selected as the value L (step S3).

(3) Calculation of the number of cuts Next, using the obtained maximum value L of the shortest distance and the cutting pitch P of the tool, the number of cuts i = (the maximum value of the shortest distance L ÷
The cutting pitch is calculated (step S4). As shown in FIG. 6, this is based on the constituent point h of the mold material shape 4 furthest away from the outer shape of the convex polygon 21 and as a base point.
Corresponds to the calculation of the number of cuts giving a fixed trajectory around the outer periphery of the cutting edge.

(4) Generation of a trajectory about the outer periphery of the convex polygon (4-1) Offset processing for the cutting pitch of the trajectory To calculate a trajectory with a fixed allowance, the i trajectories obtained in FIG. For each of the trajectories, as shown in FIG.
An offset shape 22 of each trajectory is obtained by offsetting outward by the cutting pitch P × (i−1) (where i = 1, 2,..., The number of cuts) (step S5). For the sake of simplicity, FIG. 7 shows only the offset shape 22 for one locus.

(4-2) Extraction processing of actual trajectory in mold material shape As shown in FIG. 8, line portions (shown by dotted lines) of the offset shape 22 outside the mold material shape 4 are erased. Then, only the actual cutting line inside the mold material shape 4 is taken out (step S6).

(4-3) Offset processing for the tool radius of the offset shape As shown in FIG. 9, the offset shape 22 obtained by the processing of FIG. 8 is offset outward by the tool radius R (step S7). ), The movement locus 3 of the tool center at the time of actual cutting is obtained.

(4-4) Circular processing of approach section As shown in FIG. 10, the approach section 24 of the movement trajectory 3 of the tool center obtained by the processing of FIG. Add arc locus 7 (step S
8). This arc processing can reduce the processing load on the approach portion, prevent accidents such as chipping, and shorten the processing time. The arc trajectory 7 to be added to the approach portion 24 may have a minimum length, for example, a length up to a tool radius + a margin as shown in the figure.

(4-5) Circular processing of retract part As shown in FIG. 11, the retract part 26 of the moving trajectory 3 centered on the tool is subjected to circular arc processing, and an arc trajectory 8 of a predetermined length is added (step). S9). This added arc locus 8 is, for example, a tool radius +
The length may be up to the margin. The arc processing of the retract part 26 can be omitted when the mirror processing is not performed.

(4-6) Calculation of latest die material shape after cutting As shown in FIG. 12, the latest die material shape after cutting in the case of cutting along the tool center movement locus 3 generated in FIG. The mold material shape 28 is obtained by calculation (step S10).

By the processes (1) to (4-6) described above, the moving trajectory 3 with a fixed allowance for the outer periphery of the convex polygon 21 of the mold product shape 1 and the moving trajectory 3
The latest mold material shape 28 of the outer peripheral portion of the convex polygon 21 after cutting when cutting along is obtained.

(5) Generating a trajectory for the concave portion of the convex polygon (5-1) Offset processing of the outer shape of the die product shape As shown in FIG. An offset shape 31 offset to the outside is obtained (step S11). Note that this offset shape 3
Numeral 1 is for efficiently applying arcs to both ends of the movement trajectory of the inside 9 of the mold product shape 1.

(5-2) Offset Processing of Convex Polygon As shown in FIG. 14, the convex polygon 21 is offset outward by (tool radius R-tool pitch P) at a time. An offset shape 32 with a fixed allowance is obtained (step S12). This offset processing is for calculating a moving trajectory with a fixed allowance. Note that only one offset shape 32 is shown in FIG. 14 for easy understanding.

(5-3) Processing for Extracting Processing Locus for Convex Polygonal Depression As shown in FIG. 15, the offset shape 32 obtained in FIG. 14 is replaced with the offset shape 31 obtained in FIG. (Shown by a dotted line) and remove only the outer line (shown by a solid line) (step S1).
3).

(5-4) Arc processing at both ends of the movement trajectory As shown in FIG. 16, the taken-out line 32 and the offset shape 31 are offset by the radius R of the tool 5 to determine the intersection, and the point is defined as the center. An arc is drawn, and the obtained line is set as the locus 3 of the tool center in the recess 9 (step S14). By this arc processing, tool load can be reduced and machining can be made more efficient.

(5-5) Arc processing of approach section and retractor section As shown in FIG. 17, the moving trajectory 3 obtained in FIG.
The arc trajectories 10 and 11 having a predetermined length are added to the approach portion 33 and the retract portion 34 at both ends (steps S15 and S16). Thereby, the processing load on the approach portion and the retract portion can be reduced, an accident such as chipping can be prevented, and the processing time can be shortened.

(5-6) Calculation of latest mold material shape of concave portion after cutting As shown in FIG. 18, after cutting when cutting along the tool path 3 generated in FIG. The latest mold material shape 35 is obtained by calculation (step S1).
7).

By the processes (5-1) to (5-6) described above, the moving trajectory 3 with a fixed allowance for the concave portion 9 of the mold product shape 1 and the cutting along the moving trajectory 3 Thus, the latest mold material shape 35 of the concave portion 9 after cutting is obtained.

Therefore, the movement trajectory 3 obtained by the processing from (1) to (4-6) and the (5-1)
Locus 3 obtained by the processing from (5) to (5-6)
In addition, it is possible to obtain a constant trajectory 3 (see FIG. 22) for cutting the die product shape 1 from the die material shape 6.

The moving trajectory 3 generated as described above
Is merely a processing trajectory with a fixed allowance, and if it is used as it is, it may take a long time and the efficiency may be poor.
In order to shorten the machining time as much as possible, it is desirable to set the cutting order of each trajectory and the connection distance of the tool between the cutting portions to be the shortest. Therefore, in step S18,
The setting of the cutting order of the trajectory and the connection processing between the cutting parts are performed so that the movement becomes the shortest time.

FIG. 19 shows a method of setting the cutting order of the locus. In this figure, the middle three trajectories are all-circumferential trajectories.
The cutting order can be freely set as long as the order of the trajectories of the portions is not reversed in each block.
Therefore, the CPU 101 obtains the moving distance by variously changing the connection order of these parts (a) to (h), and determines the path having the shortest moving distance as the cutting order of the trajectory.

As described with reference to FIG. 24, the connection movement of the tool between the cutting portions is performed by selecting a path that does not cause interference (collision) on the xy plane. The connection path of the tool between the cutting parts on the xy plane can be determined as shown in FIG. That is, a predetermined pitch (for example, 10 mm
When a reference point group is set at (interval) and the tool is moved from the point PA to the point PB of the reference point group, the distance between PA and PB is 5
A temporary pass point P1 to P5 less than about the point is set, and a route from the point PA to the point PB through any of these temporary pass points P1 to P5 is calculated, and the route becomes the shortest route among these. The path is determined as a tool connection path.

FIG. 21 shows an example of generation of a tool path having a fixed cutting margin finally obtained by the present invention as described above.

The machining trajectory with a fixed cutting allowance automatically generated as described above and the calculated shape after cutting are displayed on the display device 106 as necessary, and the output device 10
5 is output as processing data of the NC processing machine (step S19).

At the time of the chipping in the rough and chipping method shown in FIG. 21 (B), the die material shape 6 is cut by the chipping in the preceding chip. A shape may be used. In addition, it goes without saying that the present invention can be applied not only to the above-described rough and chipping / burring processing method but also to ordinary roughing processing.

[0042]

As described above, according to the present invention, without offsetting from the outer shape of the mold product shape,
Since the moving trajectory with a fixed allowance is automatically generated by offsetting from the mold material shape, the processing load can be kept constant in mold manufacturing using high-hardness materials such as cast and forged parts and plastics. Accidents such as chipping can be eliminated, and machining time can be reduced. In addition, since the arc processing is performed on both ends of the approach portion and the retract portion of the generated movement trajectory and the trajectory of the concave portion of the mold product shape, the load when approaching the cutting position can be reduced, and the tool can be reduced. Breakage can be further reduced, and processing time can be further reduced by employing mirror processing or the like. Further, since the movement of the tool between the cutting sections is performed on the xy plane, it is not necessary to reduce the speed at the approach section of the next cutting section, and the processing efficiency can be further improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of the device of the present invention.

FIG. 2 is a flowchart of a processing operation of the method of the present invention.

FIG. 3 is a diagram illustrating an example of a mold material shape and a mold product shape.

FIG. 4 is an explanatory diagram of a method of generating a convex polygon.

FIG. 5 is an explanatory diagram of a maximum value of a re-short distance between a convex polygon and a constituent point of a mold material shape.

FIG. 6 is an explanatory diagram of the number of cuts on a processing locus.

FIG. 7 is an explanatory diagram of an offset shape of a convex polygon.

FIG. 8 is an explanatory diagram of extracting a real trajectory portion of a convex polygon offset shape.

FIG. 9 is an explanatory diagram of a method of obtaining a tool center locus.

FIG. 10 is an explanatory diagram of the arc processing of the approach unit.

FIG. 11 is an explanatory diagram of the arc processing of the retract unit.

FIG. 12 is an explanatory diagram of a shape after cutting.

FIG. 13 is an explanatory diagram of an offset of a mold product shape for a locus of a concave portion.

FIG. 14 is an explanatory diagram of offset of a convex polygonal shape for a locus of a concave portion.

FIG. 15 is an explanatory diagram of extraction of an actual trajectory portion for a concave trajectory.

FIG. 16 is an explanatory diagram of arcuate hooking at both ends of a locus.

FIG. 17 is an explanatory diagram of the arc processing of the approach unit and the retract unit.

FIG. 18 is an explanatory diagram of a shape of a recess after cutting.

FIG. 19 is an explanatory diagram of a setting method of a cutting order.

FIG. 20 is an explanatory diagram of a connection method on the xy plane between cutting portions.

FIG. 21 is a diagram showing a practical example of an automatically generated machining locus.

FIG. 22 is a schematic explanatory view of a processing locus formed by the method of the present invention.

FIG. 23 is an explanatory diagram of a conventional tool movement.

FIG. 24 is a schematic illustration of tool movement on the xy plane in the method of the present invention.

FIG. 25 is an explanatory view of the principle of the rough and chipping-on grit processing method.

FIG. 26 is an explanatory diagram of a tool path in a conventional roughing process.

FIG. 27 is an explanatory diagram of a tool load at a concave polygonal line portion.

[Explanation of symbols]

 Reference Signs List 1 Mold product shape 2 Mold product shape outer shape 3 Processing locus 5 Tool 6 Mold material shape 7,8 arc 9 Concave 10,11 Arc 21 Convex polygon 22 Locus offset shape 24 Approach part 26 Retract part 28 After cutting Latest mold material shape 31 Offset shape of mold product shape 32 Offset shape of convex polygon 33 Approach part 34 Retract part 35 Latest mold material shape after cutting

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Claims (12)

[Claims] 1. An input step of inputting processing conditions required for generating a trajectory such as a shape of a die product, a shape of a die material, a radius of a tool to be used, and a cutting pitch of a tool, and connecting a convex vertex of the shape of the die product. A step of obtaining a convex polygon, and the maximum value of the shortest distance between the obtained convex polygon obtained in the above step and the constituent point of the mold material shape is obtained, and this maximum value is divided by the cutting pitch of the tool. A step of calculating the number of cuts between the constituent point giving the maximum value and the convex polygon, and a cutting locus for the number of cuts on the outer periphery of the convex polygon based on the number of cuts calculated in the step. And after offsetting each of the cutting trajectories generated in the above step by the cutting pitch of the tool, extracting only the trajectories included in the mold material shape for each of the offset processed trajectories. And each of the extracted Offsetting the trace outward by the tool radius and extracting the trace as a movement trajectory for the outer region of the convex polygon; and offsetting the outer shape of the die product shape outward by the tool radius to form the die product shape. Generating an offset shape of the convex polygon, and offsetting the convex polygon outward by a difference between a tool radius and a tool pitch to generate an offset shape of the convex polygon; and the convex polygon obtained in the step. The step of extracting only the line portion that protrudes from the offset shape of the mold product shape of the offset shape and extracting it as the movement locus of the concave portion surrounded by the convex polygon and the mold product shape, as described above. By combining the movement trajectory of the extracted outer region of the convex polygon with the movement trajectory of the concave portion surrounded by the convex polygon and the mold product shape. Accordingly, there is provided an output step of outputting a moving trajectory with a fixed allowance, and a method of automatically generating a tool trajectory for roughing. 2. A tool path for roughing machining according to claim 1, further comprising a step of performing an arc process on at least an approach portion of a movement trajectory of the generated convex polygon outside region. Generation method. 3. The method according to claim 1, further comprising the step of performing arc processing on both ends of the movement trajectory of the concave portion surrounded by the generated convex polygon and the mold product shape. Automatic generation of tool trajectory for roughing. 4. The method according to claim 1, wherein the movement of the tool between the cutting parts is performed on an xy plane. 5. An input means for inputting machining conditions required for generating a locus such as a mold product shape, a mold material shape, a radius of a tool to be used, a cutting pitch of a tool, and a convex vertex of the mold product shape. Means for obtaining a convex polygon, and the maximum value of the shortest distance between the obtained convex polygon obtained by the means and the constituent point of the mold material shape is obtained, and this maximum value is divided by the cutting pitch of the tool. Means for calculating the number of cuts between the constituent point that gives the maximum value and the convex polygon, and a cutting locus for the number of cuts on the outer periphery of the convex polygon based on the number of cuts calculated by the means. Means for generating, after offsetting each of the cutting trajectories generated by the means by the cutting pitch of the tool, extracting only the trajectory included in the mold material shape for each of the offset processed trajectories And each of the extracted Means for offsetting the trace outward by the tool radius and extracting it as a movement trajectory for the outer region of the convex polygon; and offsetting the outer shape of the die product shape outward by the tool radius to form the die product shape. Means for generating an offset shape of the convex polygon, and offsetting the convex polygon to the outside by a difference between a tool radius and a tool pitch to generate an offset shape of the convex polygon; and the convex polygon obtained by the means. Means for taking out only the line portion that protrudes from the offset shape of the mold product shape of the offset shape and taking out as a movement locus of the concave portion surrounded by the convex polygon and the mold product shape, as described above. By combining the movement trajectory of the extracted outer region of the convex polygon with the movement trajectory of the concave portion surrounded by the convex polygon and the mold product shape. Therefore, an automatic generation device for a roughing tool trajectory, comprising an output means for outputting the trajectory as a constant trajectory. 6. An automatic tool trajectory for roughing machining according to claim 5, wherein a means for performing an arc processing is added to at least an approach portion of a movement trajectory of the generated convex polygon outside region. Generator. 7. A means for performing arc processing on both ends of a movement locus of a concave portion surrounded by the generated convex polygon and the mold product shape is added. Automatic generation of tool trajectory for rough machining. 8. The apparatus according to claim 5, wherein the movement of the tool between the cutting sections is performed on an xy plane. 9. A procedure for obtaining a convex polygon connecting convex vertices of a mold product shape, and a maximum value of the shortest distance between the obtained convex polygon obtained by the procedure and a constituent point of the mold material shape. Determine the maximum value by dividing the maximum value by the cutting pitch of the tool, a procedure for calculating the number of cuts between the constituent point that gives the maximum value and the convex polygon, and based on the number of cuts calculated in the above procedure. A step of generating the cutting trajectory for the number of cuts on the outer periphery of the convex polygon, and after offsetting each of the cutting trajectories generated in the above procedure by a cutting pitch of the tool, the offset processing is performed. Extracting a trajectory of the trajectory included in the mold material shape, offsetting the extracted trajectory outward by a tool radius, and extracting the trajectory as a movement trajectory for the outer region of the convex polygon; Mold Offset the outer shape by a tool radius to generate an offset shape of the mold product shape, and offset the convex polygon outward by the difference between the tool radius and the tool pitch to form a convex polygon. A procedure for generating an offset shape, and taking out only the line portions that protrude from the offset shape of the mold product shape of the convex polygon offset shape obtained in the procedure, the convex polygon and the mold product shape. A step of extracting the movement locus of the enclosed concave portion, and a movement locus of the outer region of the convex polygon extracted as described above, and the movement of the concave portion surrounded by the convex polygon and the mold product shape. And an output procedure for outputting a fixed machining allowance by combining the trajectory with the trajectory. Computer readable recording medium. 10. The automatic trajectory tool trajectory according to claim 9, further comprising a step of performing an arc process on at least an approach portion of a movement trajectory of the generated convex polygon outside region. A computer-readable recording medium on which a generation program is recorded. 11. The method according to claim 9, further comprising the step of performing arc processing on both ends of the movement trajectory of the generated convex polygon and the concave portion surrounded by the mold product shape. A computer-readable recording medium on which a program for automatically generating a tool path for roughing is recorded. 12. The program according to claim 9, wherein the movement of the tool between the cutting parts is performed on an xy plane. A computer-readable recording medium that has been recorded.