JPH07253810A - Numerical control processing unit - Google Patents

Abstract

PURPOSE:To protect tools in details by obtaining a point at which a progressing direction of a tool blade tip changes as a cross point between an intermediate cut line and a contour cut line and automatically revising a cut condition when the tool blade tip comes to a prescribed period in the vicinity of the cross point. CONSTITUTION:The processing unit is provided with a speed revision block entry means 13 for the operator to designate in advance a block to be revised, that is, a speed revision block L when the processing speed is revised before a blade tip reaches a cross point between a rod cut line and a final processing shape while the rod cut line is being cut and with a speed revision block storage means 14 storing the speed revision block L entered by the means 13. Then a rod cut line command speed revision means 15 provides an output of after speed revision rod cut line commands BV1', bv1 based on the command BV1 received from a rod cut line command generating means 8 and on the speed revision block L from the speed revision block storage means 14 and an after revision feed speed FB from a cut cycle control means 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerically controlled machining apparatus, and more particularly, to the shape of an object to be processed by repeating a cutting cycle in which a rotating object to be machined is cut by a predetermined depth. The present invention relates to a numerical control machining device for machining a final machining shape instructed by numerical control information.

[0002]

2. Description of the Related Art An example of a conventional numerically controlled machining apparatus will be described with reference to FIG.

Reference numeral 1 is a machining program, 2 is program reading means for reading the machining program, and 3 is final machining shape storage means for storing the final machining shape instructed on the machining program 1. Further, 4 is a cutting start point calculating means for calculating the cutting start point C1 of each cycle of a plurality of cutting cycles, and 5
Is a cutting start point movement command generating means for generating a cutting start point movement command MV1 for moving the tool edge to the cutting start point, and 6 is a circle for generating a round bar cutting line B1 based on the cutting start point C1. A bar cutting line generating means, 7 is a final machining shape intersection calculating means for calculating an intersection P between the round bar cutting line B1 and the final machining shape, and 8 is a tool which moves by cutting feed along the round bar cutting line B1. Round bar cutting line command BV1 showing the locus of the cutting edge
Is a round bar cutting line command generating means, and 9 is a contour cutting line command generating means for generating a contour cutting line command CV1 indicating a locus of a tool cutting edge that moves by cutting feed along the final machining shape. Then, the cutting cycle control means 10 controls the cutting cycle by repeatedly operating the respective means 4, 5, 6, 7, 8, 9 until the contour machining along the final machining shape is completed. Further, the function generating means 11 uses the round bar cutting line command BV1,
Contour cutting line command CV1, cutting start point movement command MV1
The function is generated based on. Then, the servo control means 12 controls the servo motor 20 according to the result of function generation.

Next, the specific operation will be described. Here, taking the machining using an NC lathe as an example, the rotation axis of the workpiece is the Z axis. FIG. 11 is an example of a machining program,
FIG. 12 shows the final machining shape instructed by the machining program. The point S is a point at which cutting is started, that is, a cutting cycle reference point.

In the machining program of FIG. 11, "G81" shown in the line number "N001" is a code indicating the start of shape designation in a fixed cycle, and "G80" shown in the line number "N007" is this code. It is a code that ends the shape designation. And "N001" and "N0
The coordinates of each shape designation point are indicated by the Z coordinate and the X coordinate in "N002" to "N006" sandwiched between 07 ". Also," N008 "is represented by the shape designation starting from" N001 ". To start the machining toward the final machining shape, where "D" and "F" are respectively
The cutting amount per cutting cycle and the feed rate during cutting are shown.

FIG. 12 shows a cross section of the final machined shape passing through the rotation axis, and the final machined shape is shown by an outline. Since the final processed shape is a symmetrical shape around the rotation axis (Z axis), only half of the shape is shown in FIG.

When the program reading means 2 reads the final machining shape commands "N001" to "N007", this data is stored in the final machining shape storage means 3. When the program reading means 2 next reads the cutting cycle execution command “N008”, it outputs the cutting cycle execution command C and the cutting cycle start signal CS to the cutting cycle control means 10. Upon receiving the cutting cycle execution command C and the start signal CS, the cutting cycle control means 10 outputs the cutting amount D per one cutting cycle and the calculation start signal DS to the cutting start point calculating means 4. When the cutting start point calculating means 4 receives the cutting amount D and the calculation start signal DS,
The current position CPD (cutting cycle reference point S in this case) is received from the function generating means 11, and the cutting start point C1 is calculated based on the cutting cycle reference point S, the cutting amount D, and the starting point of the final machining shape (Fig. 14 (A)), the cutting start point C1 is output to the cutting start point movement command generation means 5 and the round bar cutting line generation means 6.

Next, the cutting cycle control means 10
Outputs a generation start signal MS to the cut start point movement command generation means 5. When the cutting start point movement command generation means 5 receives this generation start signal MS, the cutting start point movement command MV for moving the tool blade edge to the cutting start point C1 by fast-forwarding.
1 is generated and output to the function generating means 11. The function generating means 11 generates a function based on the cutting start point movement command MV1, and as a result, the axis is moved via the servo motor (see FIG. 13).

Next, the cutting cycle control means 10
Is a generation start signal B to the round bar cutting line generating means 6.
Output S. The round bar cutting line generating means 6 generates a round bar cutting line B1 in parallel with the Z axis from the generation start signal BS and the cutting starting point C1 (see FIG. 14A), and the final machining shape intersection calculating means 7 Output to. Then, the cutting cycle control means 10 outputs the calculation start signal AS to the final machining shape intersection calculating means 7, and when the final machining shape intersection calculating means 7 receives the calculation start signal AS, the round bar cutting line B1 and the final machining shape are detected. Whether or not it intersects is determined, and the determination signal AR is output to the cutting cycle control means 10, and when it intersects, the intersection point P (see FIG. 14B).
The coordinates are output to the round bar cutting line command generating means 8 and the contour cutting line command generating means 9. In the case of a signal that the determination signal AR intersects, the cutting cycle control means 10 first outputs the cutting feed speed F and the generation start signal BCS to the round bar cutting line command generation means 8. Upon receiving the generation start signal BCS, the round bar cutting line command generating means 8 generates a round bar cutting line command BV1 from the cutting feed speed F, the round bar cutting line B1, and the intersection point P (see FIG. 14C). It is output to the function generating means 11 to cause the function to be generated by cutting feed along the round bar cutting line and to perform the axis movement according to the function (see FIG. 13).

Next, the cutting cycle control means 10 outputs the cutting feed speed F and the generation start signal CCS to the contour cutting line command generation means 9, and when the contour cutting line command generation means 9 receives the generation start signal CCS, the cutting feed speed. Contour cutting line command CV from F, intersection P, and final machining shape
1 is generated (see FIG. 14C) and output to the function generating means 11 to generate a function by cutting feed along the final machining shape, and as a result, axis movement is performed via the servo motor (FIG. 13). reference).

Axis movement operation MV1 → BV1 → CV1
When the cutting cycle consisting of is completed, the cutting amount is further cut by the cutting amount D and the next cutting cycle is executed. At this time as well, similarly to the first cycle, the cutting start point C2 is obtained, and the movement commands MV2, BV2, and CV2 are generated based on this. Then, axis movement is performed based on these commands. Such a cutting cycle is repeated by the control of the cutting cycle control means 10 until the final processed shape is reached, and as a result, as shown in FIG. 13, MV2 → BV2 → CV2 → MV3 → BV3 → CV.
3 → MV4 → BV4 → CV4 → MV5 → BV5 → CV5
The axis movement is performed as → MV6 → BV6 → CV6.

[0012]

The above-mentioned conventional technique has an advantage that a complicated operation can be described by simple numerical control information when the final machining shape is cut out from the material. However, on the other hand, it was not possible to provide detailed support for various aspects of cutting. For example, from a round bar cutting line (for example, BV1) to a contour cutting line (for example, BV1)
It was not possible to protect the cutting tool by temporarily reducing the feed rate at the portion where the cutting direction suddenly changes because the cutting edge trajectory changes to CV1). In the above-mentioned conventional apparatus, if the feed rate is intentionally reduced in order to protect the cutting tool, the entire feed rate must be reduced, which causes a problem of increasing the processing time.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a numerically controlled machining apparatus capable of finely responding to various aspects of cutting.

[0014]

In order to achieve the above-mentioned object, the numerically controlled machining apparatus according to the present invention performs one cutting cycle for cutting a rotating workpiece by a predetermined depth. A numerical control machining apparatus for machining the shape of a workpiece into a final machining shape instructed by numerical control information by repeating the above, wherein the rotary axis of the workpiece in each cutting cycle is based on the numerical control information. Direction or a means for obtaining an intermediate cutting line indicating a trajectory of a tool cutting edge along a direction perpendicular to the rotation axis direction, and based on the numerical control information, the final machining shape and the intermediate cutting line in each cutting cycle. And a contour cutting showing a locus of a tool cutting edge along the final machining shape from the intersection to the cutting edge for each cutting cycle based on the numerical control information. Means for determining an in, in a predetermined section of the intersection near the intermediate cutting line, characterized by having a means for changing the cutting conditions during processing. In this configuration, it is also preferable to further provide means for dividing the final machining shape into a plurality of shape elements and means for instructing whether or not to change the cutting condition at the time of machining for each shape element. .

In another configuration of the present invention, the shape of the work piece is converted into numerical control information by repeating a cutting cycle in which the rotating work piece is cut by a predetermined depth by one or more times. A numerical control machining device for machining to a final machining shape instructed, based on the numerical control information, along a rotational axis direction of a workpiece in each of the cutting cycles or a direction perpendicular to the rotational axis direction. Means for obtaining an intermediate cutting line indicating the trajectory of the tool edge, based on the numerical control information, means for calculating an intersection of the final machining shape and the intermediate cutting line in each cutting cycle, and based on the numerical control information. A means for obtaining a contour cutting line indicating a trajectory of a tool edge along the final machining shape from the intersection point for each cutting cycle; A means for dividing the cutting path including the inter-cutting line and the contour cutting line into a plurality of shape elements based on the traveling direction of the tool edge, and a means for obtaining an angle formed by adjacent ones of these shape elements, And a means for changing the cutting condition at the time of machining in a predetermined section near the intersection of the intermediate cutting line only when the obtained angle satisfies a predetermined condition.

[0016]

With the numerically controlled machining apparatus according to the present invention, the point that the advancing direction of the tool edge changes in each cutting cycle is
It can be obtained as the intersection of the intermediate cutting line and the contour cutting line. Then, by automatically changing the cutting conditions when the tool cutting edge comes to a predetermined section near the intersection of the intermediate cutting line, it is possible to perform detailed measures such as protection of the tool. Further, in this configuration, the final machining shape is further divided into a plurality of shape elements, and it is possible to instruct whether or not to change the cutting conditions for each shape element. Since there are no changes, the overall processing time is reduced.

Further, according to another configuration of the numerically controlled machining apparatus of the present invention, the cutting path in each cutting cycle is divided into a plurality of shape elements based on the advancing direction of the tool cutting edge, and adjacent shape elements are formed. Only when the angle satisfies a predetermined condition, by changing the cutting condition in a predetermined section near the intersection of the intermediate cutting line, the cutting condition can be changed only when protection of the tool is required,
Tool protection can be achieved with minimal increase in machining time.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a first numerical control machining apparatus according to the present invention.
It is a block diagram which shows an Example. The same numbers are given to the same means as the numerical control processing method according to the prior art, and the means provided to achieve the above-mentioned object of the present invention will be described here. The first embodiment has means for changing the cutting feed rate before the point where the cutting direction changes suddenly. In this embodiment, the cutting feed is performed along the Z-axis direction, so the portion formed by the cutting feed in each cutting cycle has a round bar shape. Therefore,
The line indicating the cutting feed along the axial direction in each cutting cycle, that is, the intermediate cutting line is referred to as a round bar cutting line here.

That is, the difference between this embodiment and the conventional apparatus is
When changing the speed before the cutting edge reaches the intersection of the round bar cutting line and the final machining shape while cutting the round bar cutting line, the operator specifies the section to be changed, that is, the speed changing section L in advance. Speed change section input means 1 for
3, speed change section storage means 14 for storing the speed change section L input by the speed change section input means 13,
And, based on the round bar cutting line command BV1 received from the round bar cutting line command generation means 8, the speed is changed by the speed change section L from the speed change section storage means 14 and the changed feed speed FB from the cutting cycle control means 10. The point is that a round bar cutting line command speed changing means 15 for outputting the rear round bar cutting line commands BV1 ′ and bv1 is provided.

Next, the specific operation will be described. Here again, the operation of the means provided to achieve the above object of the present invention will be described. FIG. 2 is an example of a machining program. What is different from the program of the conventional apparatus shown in FIG. 11 is that “N008” follows the round bar cutting line at the intersection of the round bar cutting line and the final machining shape during cutting. That is, the feed speed "FB" for changing the speed before reaching is instructed.

In FIG. 1, when the final machining shape intersection calculating means 7 receives the calculation start signal AS from the cutting cycle control means 10, it judges whether or not the round bar cutting line B1 and the final machining shape intersect, and the judgment signal. While outputting AR to the cutting cycle control means 10,
If they intersect, the intersection P (see FIG. 14B) is output to the round bar cutting line command generating means 8 and the contour cutting line command generating means 9. When the received determination signal AR crosses, the cutting cycle control means 10 first outputs the cutting feed speed F and the generation start signal BCS to the round bar cutting line command generation means 8. Upon receiving the generation start signal BCS, the round bar cutting line command generating means 8 generates a round bar cutting line command BV1 from the cutting feed speed F, the round bar cutting line B1, and the intersection point P (see FIG. 14C). It outputs to the bar cutting line command speed changing means 15.

Next, the cutting cycle control means 10
Outputs the generation start signal ES and the changed feed speed FB to the round bar cutting line command speed changing means 15. When the round bar cutting line command speed changing means 15 receives the generation start signal ES and the changed feed speed FB, based on the round bar cutting line command BV1 received from the round bar cutting line command generating means 8,
A point returned by the speed change section L from the end point (intersection P) of the round bar cutting line command BV1 is obtained (see FIG. 4A), and B
Divide V1. At this time, the speed change section L is given from the speed change section storage means 14. The section of the speed change section L divided in this way is set to bv1, and the feed speed of this section is set to FB. The remaining part is BV1 ',
The feed rate in this section is not changed to the same feed rate F as BV1 (see FIG. 4 (B)). The speed-changed round bar cutting line commands BV1 ′ and bv1 generated in this way are supplied to the round bar cutting line command speed changing means 15 as the function generating means 1.
Output to 1. As a result, the function generating means 11 feeds the cutting along the round bar cutting line at the speed F (BV
1 '), a function is generated that changes the speed FB before the intersection point P by the speed change section L and performs cutting feed (bv1) to the intersection point P, and as a result, axis movement is performed via the servo motor (Fig. 3). The feed rate for MV1 and CV1 is the same as the conventional one.

Axis movement operation MV1 → BV1 ′ → bv
A cycle similar to the cutting cycle consisting of 1 → CV1,
It is repeated by the control of the cutting cycle control means 10 until the final processed shape is reached, and as a result, as shown in FIG. 3, MV2 → BV2 ′ → bv2 → CV2 →
MV3 → BV3 '→ bv3 → CV3 → MV4 → BV4'
→ bv4 → CV4 → MV5 → BV5 '→ bv5 → CV5
→ MV6 → BV6 '→ bv5 → CV5 → MV6 → BV
Axial movement such as 6 ′ → bv6 → CV6 is performed.

As described above, according to the first embodiment, the point where the advancing direction of the tool edge changes in each cutting cycle is
It can be obtained as the intersection of the round bar cutting line and the contour cutting line. Then, when the path of the tool edge moves from the round bar cutting line to the contour cutting line, by setting the cutting feed rate in the speed change section before the intersection point to be smaller than the normal cutting feed rate, the tool edge at the time of cutting Since the shock given to the tool can be reduced when the traveling direction of the tool suddenly changes, the tool can be protected.

FIG. 5 is a block diagram showing a second embodiment of the present invention. The same reference numerals are given to the portions already described as the first embodiment, and the differences will be described here.

In the second embodiment, the cutting path in each cutting cycle including each cutting line such as a round bar cutting line and a contour cutting line is divided into a plurality of shape elements based on the advancing direction of the tool cutting edge, and the shape elements are adjacent to each other. The angle formed by the geometrical elements is determined, and the feed rate is changed only when the angle satisfies a predetermined condition. That is, the load on the tool at the time of cutting increases as the change in the traveling direction of the tool edge increases.
That is, it is considered that the steeper the angle formed by the shape elements described above, the larger the angle. Conversely, if the angle formed by the shape elements is more than a certain degree, it is often unnecessary to change the feed rate. Therefore, in the present embodiment, an angle that requires a change in the feed rate is preset as a reference angle, and the feed rate is changed only when the reference angle is exceeded.

The second embodiment will be described in detail with reference to FIG. In FIG. 5, reference numeral 16 is a reference angle input means for an operator to previously specify a reference angle to be compared with an angle formed by adjacent cutting lines (hereinafter referred to as a connection angle), and 17 is input by the reference angle input means 16. The reference angle storage means 18 for storing the reference angle thus calculated calculates the connection angle of each cutting line and compares it with the reference angle from the reference angle storage means 17 to determine whether or not to change the cutting speed. The angle determination means, 19 is the determination result from the connection angle determination means 18, the speed change section L from the speed change section storage means 14, and the cutting cycle control means 1.
It is a cutting line command speed changing means for selectively changing the speed of the cutting line command based on the changed feed speed FB from 0. In the present embodiment, the angle is represented as 0 degree in the positive direction of the Z axis and in the clockwise direction as the positive direction.

The round bar cutting line command generating means 8 and the contour cutting line command generating means 9 have their respective cutting line commands BV.
1 and CV1 are output to the connection angle determination means 18. Further, the cutting start point movement command generation means 5 outputs the movement command MV1 to the connection angle determination means 18. Connection angle determination means 1
In 8, every time each cutting line command and movement command is input, the angle formed by both lines at the intersection with the cutting line command input immediately before is calculated. The contour cutting line in one cutting cycle may include a plurality of shape elements depending on how to set the depth of cut for the final machining shape. In such a case, the connection angle determination means 18 calculates the angle formed by the shape elements at the connection points between the adjacent shape elements.

The connection angle determination means 18 compares the connection angle calculated as described above with the reference angle from the reference angle storage means 17, and when the connection angle is smaller than the reference angle, the intersection point or The speed change is required for the shape element immediately before the connection point, otherwise, the speed change is not required for the shape element immediately before the connection point. It is output to the speed changing means 19. Note that the connection angle determination means 18 always adds an identifier that speed change is not necessary to the cutting start point movement command in consideration of the fact that cutting is not actually performed by the cutting start point movement command and performs cutting. It is output to the line command speed changing means 19.

The cutting line command speed changing means 19 uses the round bar cutting line command, the contour cutting line command, the cutting start point moving command and the identifier added to each of these shape elements from the connection angle judging means 18. For the shape element determined to require speed change by the identifier, the changed feed speed FB from the cutting cycle control means 10 is used, and the cutting is performed through the process (see FIG. 4) already described in the first embodiment. Change the speed of line command.

FIG. 6 shows an example of a cutting path by the numerically controlled machining apparatus according to the present embodiment, in which an arrow shown by a broken line is a portion for cutting by changing the cutting feed rate. In this example, the reference angle is assumed to be 120 degrees, and it can be understood that the cutting feed rate is changed for the portion of the connection angle smaller than 120 degrees. As described above, according to the second embodiment, when the tool moves along the cutting path, it is necessary to move the tool in the direction of a steeper angle than a certain reference angle, that is, the load on the tool is large and the tool may be damaged. Since the feed rate is reduced only when there is a problem, the time required for machining can be shortened as compared with the first embodiment described above.

FIG. 7 is a block diagram showing a third embodiment of the present invention. The same reference numerals are given to the portions already described as the embodiments, and the differences will be described here.

In the first embodiment described above, the feed rate was changed in all the sections before the intersection of the round bar cutting line and the contour cutting line, but in the third embodiment, the feed rate was changed. The part to be performed can be selected.

That is, the final machined shape storage means 3a stores the final machined shape including information on whether or not to change the cutting conditions. The final machining shape intersection calculating means 7a uses the round bar cutting line from the round bar cutting line generating means 6 and the final machining shape from the final machining shape storing means 3a and the information as to whether or not to change the cutting conditions, Obtain the intersection between the bar cutting line and the final machining shape, determine if the intersection is with the shape element of the final machining shape that has been designated when the cutting conditions are changed, and use this information for round bar cutting. It outputs to the line command generating means 8, the contour cutting line command generating means 9 and the round bar cutting line command speed changing means 15a.

When the round bar cutting line command speed changing means 15a receives the generation start signal ES and the changed feed speed FB from the cutting cycle control means 10, the round bar cutting line command speed changing means 15a receives the round bar cutting line command generating means 8. If the end point of the command coincides with the intersection on the shape element of the designated final machining shape when the cutting condition from the final machining shape intersection calculating means 7a is changed, it is compared. If they do not coincide, the speed is changed. If they match, the speed of the cutting line command is changed through the process already described as the embodiment (see FIG. 4).

FIG. 8 shows numerical control information (program) in which information as to whether or not the cutting conditions are changed is added to each shape element of the final processed shape in the third embodiment. Figure 11
"N004" is different from the conventional program shown in
"M07" is commanded to. This indicates that the cutting condition is changed only in this shape element, that is, in the round bar cutting line command that collides with the straight line from the coordinate (Z40, X20) to the coordinate (Z25, X40).

FIG. 9 shows an example of the cutting path realized by the machining program shown in FIG. 8, and the arrow shown by the broken line is the portion for cutting by changing the cutting feed rate. In this example, the coordinates (Z40, X20) to the coordinates (Z25, X4)
It can be understood that cutting is performed by selectively changing the cutting feed rate for the straight line toward 0).

As described above, according to the third embodiment, the feed rate can be reduced in front of a specific shape element among the shape elements of the final processed shape, so that peeling or the like on the cutting surface of the shape element occurs. You can reduce and clean the finish. That is, it becomes possible to deal with a case where high processing accuracy is required for a specific shape element.

Although the feed rate during cutting is changed in the embodiment, it goes without saying that not only the feed rate but also the cutting rate (spindle speed) may be changed.

Further, in the embodiments described so far, the case where the cutting feed direction is the rotational axis direction, that is, the so-called longitudinal cycle has been described, but the present invention is not limited to this, and the case where the cutting is performed in the diametrical direction. That is, it is also effective in the case of a so-called end face cycle.

[0041]

As described above, according to the present invention, since the cutting path is changed from the round bar cutting line to the contour cutting line, the feed rate is reduced at the portion where the cutting progress direction suddenly changes and the cutting tool is cut. Can be protected, and
Since the feed rate is temporarily reduced, it is not necessary to reduce the overall feed rate, and therefore the increase in processing time can be suppressed to a minimum.

[Brief description of drawings]

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

FIG. 2 is an example of numerical control information (program) used in the first embodiment.

FIG. 3 is an explanatory diagram showing a cutting path in the first embodiment.

FIG. 4 is an explanatory diagram of an operation of a round bar cutting line command speed changing means.

FIG. 5 is a block diagram showing a second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a cutting path in the second embodiment.

FIG. 7 is a block diagram showing a third embodiment of the present invention.

FIG. 8 is an example of numerical control information used in the third embodiment.

FIG. 9 is an explanatory diagram showing a cutting path according to a third embodiment.

FIG. 10 is a block diagram showing a conventional numerical control processing apparatus.

FIG. 11 is an example of numerical control information used in a conventional numerical control processing device.

12 is a diagram showing a final machining shape instructed by the numerical control information of FIG.

FIG. 13 is an explanatory diagram showing a cutting path according to a conventional technique.

FIG. 14 is an explanatory diagram of operations of a round bar cutting line command generating means and a contour cutting line command generating means.

[Explanation of symbols]

 1 Machining program 2 Program reading means 3, 3a Final machining shape storage means 4 Cutting start point calculating means 5 Cutting start point movement command generating means 6 Round bar cutting line generating means 7, 7a Final machining shape intersection calculating means 8 Round Rod cutting line command generation means 9 Contour cutting line command generation means 10 Cutting cycle control means 11 Function generation means 12 Servo control means 13 Speed change section input means 14 Speed change section storage means 15, 15a Round bar cutting line command speed change means

Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location G05B 19/4097

Claims (3)

[Claims] 1. A shape of a workpiece is machined into a final machining shape instructed by numerical control information by repeating a cutting cycle in which a rotating workpiece is cut by a predetermined depth by one or more times. A numerically controlled machining apparatus for performing, based on the numerical control information, intermediate cutting indicating a trajectory of a tool cutting edge along a rotation axis direction of a workpiece in each cutting cycle or a direction perpendicular to the rotation axis direction. A means for obtaining a line, a means for calculating an intersection of the final machining shape and the intermediate cutting line in each cutting cycle based on the numerical control information, and a means for calculating each cutting cycle based on the numerical control information. A means for obtaining a contour cutting line indicating the trajectory of the tool cutting edge along the final machining shape from the intersection, and a predetermined section in the vicinity of the intersection of the intermediate cutting line. The numerical control processing machine, characterized in that it comprises means for changing the cutting conditions during processing, the. 2. The numerically controlled machining apparatus according to claim 1, further comprising means for dividing the final machining shape into a plurality of shape elements, and changing cutting conditions at the time of machining for each shape element. A numerically controlled machining apparatus comprising: a means for instructing whether or not to do so. 3. A shape of a workpiece is machined into a final machined shape instructed by numerical control information by repeating a cutting cycle in which a rotating workpiece is cut at a predetermined depth by one or more times. A numerically controlled machining apparatus for performing, based on the numerical control information, intermediate cutting indicating a trajectory of a tool cutting edge along a rotation axis direction of a workpiece in each cutting cycle or a direction perpendicular to the rotation axis direction. A means for obtaining a line, a means for calculating an intersection of the final machining shape and the intermediate cutting line in each cutting cycle based on the numerical control information, and a means for calculating each cutting cycle based on the numerical control information. Means for obtaining a contour cutting line indicating the trajectory of the tool cutting edge along the final machining shape from the intersection, and the intermediate cutting line and contour cutting in each cutting cycle. A means for dividing a cutting path including a line into a plurality of shape elements based on the traveling direction of the tool edge, a means for obtaining an angle formed by adjacent ones of these shape elements, and a determined angle A numerical control machining apparatus comprising: means for changing the machining condition during machining in a predetermined section near the intersection of the intermediate machining line only when the condition is satisfied.