JP2000298509A - Cutting device, method for generating cutting pass and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to execute working in accordance with desired working accuracy and surface roughness in the case of working a three- dimensional free curve on an object to be worked, to shorten working time and to improve productivity. SOLUTION: The cutting device for cutting off a metal mold for molding optical parts e.g. is provided with a free curved surface working machine 10 for working an object to be worked (e.g. the optical parts molding metal mold) and a free curved surface cutting pass preparing device 20 for preparing and determining a program for controlling the machine 10 as a working condition (cutting pass) and the machine 10 is connected to the device 20 through a network N.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cutting device, a cutting path generating method, and a recording medium.

[0002]

2. Description of the Related Art Generally, in the cutting of a workpiece, when the workpiece has a rotating shaft, for example, as shown in FIG.
As shown in FIG. 5 and FIG. 16, the NC processing machine 1 of the two-axis control
, The rotation axis of the workpiece P is made coincident with the main shaft 2 of the processing machine 1 and fixed by a pressing shaft (not shown), and the tool 3 is NC-controlled while rotating the main shaft 2 so that the workpiece P is moved to a desired position. Cut to shape. That is, in the processing machine 1, the main shaft 2 that is driven to rotate is attached to the Z-axis table 4, and the tool 3 is attached to the X-axis table 5. The NC processing machine 1 moves the Z-axis table 4 and the X-axis table 5 in the directions indicated by arrows in FIG.
Then, the workpiece P is rotated in the direction indicated by the arrow in FIG.

When the workpiece P is machined using the NC machine 1 of the two-axis control, the width of the workpiece P is W, the length of the workpiece P is L, and the feed amount of the tool 3 Is fp,
The cutting distance CL can be obtained by the following equation.

[0004]

## EQU1 ## CL = W × L / fp

For example, W = 10 mm, L = 200 mm,
When fp = 0.03 mm, the cutting distance CL is CL
= 10 × 200 / 0.03 / 1000 ≒ 67 m.

However, when the workpiece has a shape having no rotation axis, it cannot be properly machined by a two-axis control NC machine, so that a free-form surface machining machine as shown in FIG. That is, processing is performed using the NC processing machine 10 of XYZ three-axis control.

The three-axis control NC machine 10 includes an X-axis table 11, a Y-axis table 12, and a Z-axis table 13. Each of the tables 11, 12, and 13 is arranged in an axis direction indicated by an arrow in FIG. Is controlled.

A workpiece P is fixed on the X-axis table 11, and a tool spindle 14 is fixed on the Y-axis table 12. At the tip of the tool spindle 14, a tool holder 15 is attached.
The tool 16 is fixed. The tool spindle 14 rotates the tool 16 around the rotation axis of the tool spindle 14 via the tool holder 15.

The three-axis control NC machine 10 processes one line of the workpiece P by simultaneous two-axis control of the X-Z axis while rotating the tool 16 by the tool spindle 14, and then the Y-axis. By controlling the table 12, the tool 16 is fed by a predetermined feed pitch amount in the Y-axis direction, and the next line is similarly processed. The NC processing machine 10 of the three-axis control performs so-called fly-cut processing in which the entire processing surface of the workpiece P is cut by repeating this process.

In this case, when the cutting shape is a plane, the cutting distance can be approximately easily obtained by the following equation.

[0011]

## EQU2 ## CL = e × N × L / f × W / p

Here, e is the cutting length per one rotation of the tool 16, N is the number of rotations of the tool 16, and L is one line length of the processing surface of the workpiece P in the X-axis direction. And f is the feed speed of the tool 16 in the line direction, W is the length of the machined surface of the workpiece P in the Y-axis direction, and p is the feed amount per operation in the Y-axis direction. .

Here, for example, as in the case where the workpiece P has a rotation axis, W = 10 mm and L =
Assuming that 200 mm and fp = 0.03 mm, e = 0.5,
When the cutting distance CL in the case of N = 6000, p = fp, f = 100 is calculated from the above equation 2, CL = 2000 m, and when the workpiece P has a shape having no rotation axis, the three-axis control is performed. When processed by the NC processing machine 10, the cutting distance CL is
The cutting distance CL is about 30 times the cutting distance CL when the workpiece P is rotated and machined. That is, when the workpiece P is not rotated, the wear of the tool 16 becomes remarkable as compared with the case where the workpiece P is rotated, and desired shape accuracy and surface roughness cannot be obtained. .

[0014]

As described above, according to the conventional mirror finishing technique, a workpiece having a shape in which the workpiece does not have a rotation axis is machined with the same precision over the entire surface of the machined surface. As described above, as described above, the machining distance is about 30 times the machining distance when the workpiece is rotated and machined,
There is a problem that the wear of the tool is remarkably promoted as compared with the case where the workpiece is rotated, and the intended shape accuracy and surface roughness cannot be obtained.

That is, when the conventional method for cutting a mold for forming an optical component is performed in a free-form surface machining machine, the cutting distance becomes extremely long (about 30 times as large as that when the free-form surface machine is not used). As a result, due to tool change during cutting due to tool friction, influence of heat, etc., there is a problem that the shape accuracy and surface roughness are reduced, and the cost is increased due to an increase in processing time.

According to the present invention, the rotary tool is moved around a predetermined trajectory at a predetermined feed amount while being rotated around a predetermined axis while being in contact with the workpiece, and one line is processed. When a tool is fed by a predetermined feed pitch amount in a pitch direction which is a direction orthogonal to the line direction, a processing process for processing the next line is sequentially performed, and when processing a three-dimensional free-form surface on a workpiece, It is an object of the present invention to provide a cutting device, a cutting path generation method, and a recording medium that can perform processing to the processing accuracy and surface roughness of a workpiece, shorten the processing time, and improve productivity. .

[0017]

According to one aspect of the present invention, a free-form surface processing machine for processing a workpiece and a program for controlling the free-form surface processing machine are created as a cutting path. A free-form surface cutting path creating device, the free-form surface processing machine and the free-form surface cutting path creating device are connected by a network, and the free-form surface cutting path creating device has processing means for creating a cutting path, Storage means for storing the cutting path created by the means is provided, and the cutting path stored in the storage means of the free-form surface cutting path creation device is sent to the free-form surface processing machine through a network during processing. The processing means of the free-form surface cutting path creating apparatus is a precision multiple dividing means as a sub-module for performing a dividing process for appropriate roughness of the surface of the workpiece. A cutting device which is characterized in that it comprises.

According to a second aspect of the present invention, there is provided a cutting path creating method for creating a program for controlling a free-form surface machining machine as a cutting path, comprising: a condition inputting step in which a user inputs various conditions; It has a condition judgment / decision step of judging the validity of the processing condition, and a cutting path calculation step of calculating a cutting path from the condition.
An effective range input processing step in which the user inputs a range to be precisely processed; a division pattern input processing step in which the user inputs a division pattern of surface roughness; and a processing condition in which the user inputs parameters for changing the surface roughness. An input processing step, and in the condition judging / deciding step, a cutting path is created by judging the validity of the condition by using an injection moldability database and a cutting edge wear database. Is the way.

According to a third aspect of the present invention, there is provided a recording medium on which a program for executing the cutting path generating method according to the second aspect is recorded.

According to a fourth aspect of the present invention, there is provided a cutting path creating method for creating a program for controlling a free-form surface machining machine as a cutting path, comprising: a condition inputting step in which a user inputs various conditions; It has a condition judgment / decision step of judging the validity of the processing condition, and a cutting path calculation step of calculating a cutting path from the condition.
An effective range input processing step in which the user inputs a range to be processed precisely, a division pattern input processing step in which the user inputs a division pattern of surface roughness, and a processing condition in which the user inputs processing conditions for an area to be most precisely finished It has an input processing step, and in the condition judgment / decision step, it is necessary to determine the validity of the conditions using the injection moldability database and the cutting edge wear database and to present the optimum value, thereby creating a cutting path. This is a characteristic cutting path generation method.

According to a fifth aspect of the present invention, there is provided a recording medium storing a program for executing the cutting path generating method according to the fourth aspect.

According to a sixth aspect of the present invention, in the cutting path generating method according to the second or fourth aspect, the conditions for changing the surface roughness in the cutting path calculating step are as follows.
If even a part of one line in the processing direction enters the “effective range + machining allowance”, it is regarded as precision finishing.
If it does not fit in the "cutting allowance", it is regarded as rough finishing. If the surface division pattern specified by the user does not match the calculated surface division pattern of the cutting path, the rough area is narrow in the precision, coarse, and precision pattern. Is a cutting pass generation method, characterized in that a precision finishing is performed.

According to a seventh aspect of the present invention, there is provided a recording medium storing a program for executing the cutting path generating method according to the sixth aspect.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration example of a cutting device according to the present invention. Referring to FIG. 1, this cutting device is, for example, a device for cutting an optical component molding die, and includes a free-form surface processing machine 10 for processing a workpiece (for example, an optical component molding die). A free-form surface cutting path creating device 20 for creating and determining a program for controlling the curved surface machine 10 as machining conditions (cutting paths) is provided. The free-form surface machining device 10 and the free-form surface cutting path creating device 20 are connected via a network LN. Have been.

Here, the free-form surface cutting path creating device 20 includes an input / output unit 21, a display unit 22, a processing unit 23 for creating a processing condition (cutting path), and a processing condition created by the processing unit 23. Storage means 2 for storing (cutting path)
4 and a network I / F (interface) means 25 are provided. The input / output unit 21 and the display unit 22
It is used to determine conditions for creating a cutting path.

In such a configuration, the cutting path created by the processing means 23 is temporarily stored in the storage means 24,
The processing conditions (cutting paths) stored in the storage means 24 are sent to the free-form surface processing machine 10 via the network LN during processing. Further, in the free-form surface cutting path creating apparatus 20 of FIG. 1, the processing unit 23 includes a precision multiple dividing unit 26 as a sub-module for performing a dividing process for appropriate roughness of the surface of the workpiece. Thus, the machined surface can be divided into regions according to the processing accuracy required for the workpiece P, and processing can be performed with the required processing accuracy.

FIG. 2 is a diagram showing a configuration example of the free-form surface processing machine 10. Here, the free-form surface processing machine 10 of FIG.
It is configured as an NC machine with YZ three-axis control.

In FIG. 2, a free-form surface processing machine, that is, an NC processing machine 10 of three-axis control has an X-axis table 11, a Y-axis table 12, and a Z-axis table 13, and each of the tables 11, 12, 13 is The movement is controlled in the axial directions indicated by arrows in FIG. 2 by a control unit (not shown).

A workpiece P is fixed on the X-axis table 11, and the workpiece P is, for example, a mirror piece of a mold.

The Y-axis table 12 has a tool spindle 1
4 is fixed. At the tip of the tool spindle 14,
The tool holder 15 is attached, and the tool 16 is fixed to the tool holder 15.

As the tool 16, for example, a single crystal diamond tool 16 a as shown in FIG. 3 is used, and the tool spindle 14 moves the single crystal diamond tool 16 a through a tool holder 15 around the rotation axis of the tool spindle 14. Rotate.

As shown in FIG. 3, for example, the single-crystal diamond tool 16a has a cutting edge formed in an arc shape with a radius r of 5 mm, and the cutting edge contour accuracy is 0.1 μm or less.

The NC machine 10 of three-axis control uses a tool spindle 14 to rotate a tool 16 (a single crystal diamond tool 16).
While rotating a), one line of the workpiece P is processed by simultaneous two-axis control of the X-Z axis, and then the Y-axis table 1 is rotated.
2, the tool 16 is fed in the Y-axis direction, and the next line is similarly processed. The NC processing machine 10 of three-axis control performs so-called fly-cut processing in which the entire processing surface of the workpiece P is cut by repeating this process.

At this time, when the cutting shape is a plane, the cutting distance can be approximately easily obtained by the following equation.

[0035]

## EQU3 ## CL = e × N × L / f × W / p

Here, e is the cutting length per one rotation of the tool 16, N is the number of rotations of the tool 16, and L is one line length of the processing surface of the workpiece P in the X-axis direction. And f is the feed speed of the tool 16 in the line direction, W is the length of the machined surface of the workpiece P in the Y-axis direction, and p is the feed amount per operation in the Y-axis direction. .

As shown in FIG. 4, the cutting length e per rotation of the tool 16 is given by the following equation, where R is the radius of rotation of the tool 16, θ is the cutting angle, and d is the cutting depth. Given.

[0038]

E = R × θ θ = cos ⁻¹ ((R−d) / R)

Further, when the surface to be machined on the workpiece P is an aspherical surface, the cutting length L of one line is generally approximately equal to the cutting length Z (x) by the following equation. It can be obtained by finding and substituting it into the cutting length L of one line in the above equation.

[0040]

(Equation 5)

Here, C _mo is the curvature of the aspherical line, X is a variable in the line direction, and A and K are coefficients.

The cutting apparatus according to the present invention basically performs the same machining precision on the entire processing surface of the workpiece P as in the invention described in Japanese Patent Application No. 10-288932, which is a prior application of the present application. Instead, the machined surface is divided into regions with the machining accuracy required for the workpiece P, and machining is performed with the required machining accuracy.

The basic processing of the cutting apparatus according to the present invention is performed by using a three-axis control NC machine 10 to move a mirror surface piece of a mold to a workpiece P.
First, a description will be given of a case where cutting is performed.

It is not always necessary for the workpiece P to be cut with uniform accuracy on all of its processing surfaces. Generally, an area (effective area) requiring high-precision processing and an effective area for processing are effective. There are areas (ineffective areas) that do not require as high accuracy as areas. For example, a region corresponding to the lens surface of a mirror surface piece needs to be processed with high precision as an effective region, but a region other than the lens surface does not require processing precision as much as the lens surface as a non-effective region.

Therefore, the NC machine 10 shown in FIG. 2 moves the workpiece P in the longitudinal direction while rotating the tool 16 (single crystal diamond tool 16a) as shown by the arrow in FIG. When cutting is performed, the tool 16 is fed in the short direction (pitch direction) at a predetermined feed pitch, and the cutting is performed by moving the tool 16 in the longitudinal direction while rotating the tool 16 again. Changes the processing accuracy between the effective area and the non-effective area.

That is, when processing is performed by the NC processing machine 10 shown in FIG. 2, first, the relationship between the cutting distance and the shape accuracy and the relationship between the cutting distance and the surface roughness are grasped. Using this relationship and the above formula for calculating the cutting distance, the free-form surface cutting path creating device 20 sets the processing conditions (cutting paths) so that the effective area falls within the cutting distance that can be finished to the desired processing accuracy.

The setting of the processing conditions (cutting path) is based on the fact that the cutting path stored in the free-form surface cutting path creating device 20 is
When being sent from the free-form surface cutting path creation device 20 to the NC machine 10 via the network LN during machining, the NC
It is set in the processing machine 10. That is, in the free-form surface cutting path creating apparatus 20, the conditions used in the above Equation 3, Equation 4 or Equation 5 such as the cutting length e per rotation of the tool 16, the rotation number N of the tool 16, One line length L of the processing surface in the X-axis direction, feed speed f of the tool 16 in the line direction, length W of the processing surface of the workpiece P in the Y-axis direction, one feed in the Y-axis direction When the amount p, the turning radius R of the tool 16, the cutting depth d, and the tool radius r are numerically input from the input / output means 21, the processing means 23 of the free-form surface cutting path creation device 20 automatically sets the machining conditions (cutting paths) by a program. The processing conditions (cutting paths) calculated in the processing means 23 and stored in the storage means 24 are transmitted to the NC processing machine 10 via the network LN. send.

In the calculation of the processing conditions (cutting path) in the processing means 23, as described above, a program is created from the relationship between the cut distance and the shape accuracy and the relationship between the cut distance and the surface roughness. For example, when the tool 16 is a single crystal diamond tool 16a, the shape of the cutting edge is a circular arc, and the shape accuracy is 0.1 μm or less and a radius of 5 mm,
The cutting distance (cutting length) and the shape accuracy of the machined surface of the workpiece P
The relationship is as shown in FIG.
(Cutting length) and the surface roughness have a relationship as shown in FIG.

For example, L = 200 mm, W = 12 mm,
FIG. 7 shows a case where a mirror piece having a length of 8 mm in the short side direction of the effective area of the workpiece P is finished to a surface roughness of 0.07 μm or less.
As can be seen from the figure, it is necessary to keep the cutting distance within 3500 m.

However, according to the conventional mirror polishing method for processing the entire processing surface of the workpiece P with the same accuracy, the cutting distance is 4500 m when calculated from the above equations (3), (4) and (5).
As can be seen from FIG. 7, the required surface roughness of 0.07 μm cannot be obtained.

Therefore, the cutting apparatus according to the present invention can be used, for example, in a region where the machined surface of the workpiece P requires high-precision machining (an effective region) and a region where the machining accuracy does not need to be as accurate as an effective slope. Focusing on the fact that there is a (non-effective area), as shown in FIG. 8, the processing surface of the workpiece P is set in a direction (transverse direction) orthogonal to the line direction (longitudinal direction) in which the tool 16 is sent. In the pitch direction, the effective area Aa and the non-effective area Ab required for high-precision machining are divided into the effective area Aa, the area of the effective area Aa within 0.07 μm of the surface roughness, Is set to a condition that the surface roughness is 0.1 μm or more (input from the input / output unit 21), and the processing unit 23 executes the program (the relationship between the cutting distance and the shape accuracy and the relationship between the cutting distance and the surface roughness). Machining conditions using a program created from Calculation (decision) is performed, and the NC processing machine 10 performs processing.

For example, a single-crystal diamond tool 16a having a radius of 5 mm and an edge shape of a circular arc having a shape accuracy of 0.1 μm or less is used as the tool 16, and in the effective area Aa, the direction of the short side (pitch direction) is set. The feed pitch P, which is the feed amount, is 0.04 mm, and the feed speed f of the tool 16a is 50 m.
m / min, and in the non-effective slope Ab, the feed pitch P
Is set to 0.08 mm, the feed rate f is set to 100 mm / min, and the other processing conditions are the same, and the NC processing machine 10 performs processing.

When the workpiece P is machined by the NC machine 10 under these conditions, the cutting distance can be suppressed to about 2700 m, and the workpiece P is cut in the short direction at the position Cp in FIG. Looking at the surface roughness, as shown in FIG. 9, a desired high-precision surface roughness processing can be performed in the effective area Aa, and in the non-effective area Ab, the desired roughness is larger than the effective area Aa. Surface roughness can be processed.

As described above, according to the above-described processing example, when processing a three-dimensional free-form surface on the workpiece P, the processing surface of the workpiece P is divided into a plurality of areas of surface roughness in the pitch direction. It is processed in a state where it does.

Therefore, the cutting distance of the tool 16 can be reduced, and the deterioration of the tool 16 can be suppressed.
Area that needs to be processed with high precision (effective area Aa)
And an inclined area (ineffective area Ab) where accuracy is not so required, and the effective area Aa which needs to be machined with high precision can be machined with desired high accuracy, and machining time can be reduced. It can be shortened to improve productivity.

In this case, the feed pitch of the tool 16 in the pitch direction is changed to change the surface roughness of the processing surface of the workpiece P, and the feed amount of the tool 16 in the line direction is changed. The surface roughness of the work surface of the workpiece P is changed by changing the surface roughness.

Therefore, the feed pitch of the tool P in a region where machining of the workpiece P is required to be performed with high precision is made fine, and the feed pitch of the tool 16 in a slope where accuracy is not so required is coarsened. Deterioration of the tool 16 can be suppressed, and slopes that need to be machined with high precision can be machined with desired high precision, and machining time can be shortened and productivity can be improved. .

Further, in the above example, the tool 16 is
The cutting edge has an arc shape, and the accuracy of the arc shape is 0.
A single-crystal diamond tool 16a of 1 μm or less is used. Therefore, it is possible to further improve the shape accuracy of the processing mirror surface in the pitch direction.

Further, the above-mentioned cutting apparatus includes the turning radius, the number of revolutions, the feed speed, the cutting amount of the tool 16 into the workpiece P, the feed pitch amount of the tool 16 in the pitch direction, and the rotation of the tool 16. Machining conditions for generating surface roughness are set based on the cutting distance of the workpiece P by the tool 16 calculated from the diameter and the like and the dimensions of the workpiece P, and machining is performed under the machining conditions.

Therefore, by appropriately calculating the processing conditions from the cutting distance and the processing accuracy, the deterioration of the tool 16 can be more appropriately suppressed, and the region where high-precision processing is required can be performed at a desired high precision. Thus, the processing can be performed more appropriately, the processing time can be shortened, and the productivity can be further improved.

Further, in the above-mentioned cutting apparatus, in the free-form surface cutting path creating apparatus 20, the turning radius, the turning force, the feed rate, the cutting amount of the tool 16 by the tool 16 and the tool 16 in the pitch direction are provided. When the feed pitch amount and the dimension of the workpiece P are numerically input from the input / output unit 21, the processing unit 23 automatically calculates the processing conditions that cause the surface roughness of the workpiece P in accordance with the numerical input. The processing conditions are calculated by the program to be executed, and the NC processing machine 10 processes the workpiece P under the calculated processing conditions.

Therefore, the machining conditions are automatically calculated appropriately from the cutting distance and the machining accuracy only by inputting the numerical values, so that the deterioration of the tool 16 can be more appropriately suppressed, and the machining needs to be performed with high accuracy. The region can be processed more appropriately and easily with a desired high precision, and the processing time can be shortened, and the productivity can be more easily improved.

If the feed speed f is increased under the above-mentioned processing conditions, the roughness / undulation component in the feed direction of the tool 16 increases, and the shape accuracy also deteriorates. Therefore, within the range of the effective area Aa, the feed appropriateness f of the tool 16 is set.
The lower the speed, the more accurate the processing can be performed.

As described above, according to the processing method described above,
While rotating the rotary tool about a predetermined axis while making contact with the workpiece, the rotary tool is moved on a predetermined trajectory by a predetermined feed amount to perform processing of one line, and then in a direction orthogonal to the line direction. When a three-dimensional free-form surface is machined on a workpiece by sequentially performing a machining process in which a tool is fed by a predetermined feed pitch amount in the pitch direction and the next line is machined, machining of the workpiece in the pitch direction is performed. Since the surface is machined in a state where the surface is divided into multiple areas of surface roughness, the cutting distance of the tool can be reduced, the deterioration of the tool can be suppressed, and it is necessary to machine the workpiece with high precision. A certain region and a region where accuracy is not required can be divided into regions, and a region that needs to be processed with high precision can be processed with desired high precision. Can improve Can.

In other words, the above-mentioned machining method is a mirror surface machining method characterized in that surfaces having different surface roughness are within the same curved surface in a direction orthogonal to the feed direction of the tool.

In the present invention, the processing means 23 of the free-form surface cutting path creating device 20 includes the precision plural dividing means 2.
A sub-module 6 is further provided, and is configured to be able to perform division processing for appropriate roughness of the surface of the workpiece by the precision plural division means 26.

FIG. 10 is a flow chart showing a processing flow of cutting path creation processed by the multiple precision dividing means 26. Referring to FIG. 10, the cutting path includes a condition input step S1 in which the user inputs various conditions, a condition determination / decision step S2 for determining the validity of the processing conditions from the conditions input in the condition input step S1, and a condition. It is created by a cutting path calculating step S3 for calculating a cutting path more.

Here, the condition input step S1 further includes an effective range input processing step 11 in which the user inputs a precise processing range (effective range), and a user inputs a division pattern (division parameters) of the surface roughness. And a processing condition input processing step S13 in which the user inputs parameters for changing the surface roughness (inputs processing conditions). Also, the condition judgment / determination step S
In No. 2, the validity of the condition is determined by using the injection moldability database (DB) and the cutting edge wear property database (DB).

In the effective range input processing step S11, the user can designate a range to be finished with high accuracy by using a die piece. Generally, the effective range is a range in which optical characteristics are required, and the effective range for gold pieces is as shown in FIG. In the example of FIG. 11, a margin is set around the effective range in consideration of the conditions of workability and formability. In the present invention, for example, as shown in FIG. 12, a surface having a different surface roughness is set in a direction orthogonal to the feed direction of the tool,
In the effective range input processing step S11, the effective range and the allowance are input, and the combination of the effective range and the allowance is
This is the range to be processed precisely in FIG.

Further, in the division pattern (division parameter) input processing step S12, the user can input how and how to divide the outside of the range to be precisely processed to roughly process.

In the processing condition input processing step S13,
The user can change the processing conditions for each surface
(Feed pick amount, feed speed, rotation speed, tool shape, etc.) can be input.

Further, in the processing example of FIG. 10, only the processing conditions in the effective range are input, and the processing conditions of the rough portion are determined by the injection moldability database (DB) and the cutting edge wear database (DB).
Can be used in the condition determination / determination step S2. Specifically, the cutting edge wear DB has a correspondence table between cutting distance and cutting edge wear and cutting edge life.
In combination with the accuracy change correspondence table provided in B, which does not hinder the injection moldability, it is possible to calculate the processing conditions under which the cutting distance of the entire surface falls within the life of the cutting edge and the cutting performance is improved. That is, it is checked in the condition determination / determination step S2 whether the user inputs the processing conditions of each surface and whether those conditions violate the rules of the injection molding DB and the blade wear DB.

Finally, the processing conditions are shown to the user in the condition judging / determining step S2, and are determined by the user. That is,
In the condition determination / determination step S2, the user can determine the appropriateness of the processing conditions using the injection moldability DB and the cutting edge wear DB, and can present an optimum value. Thereafter, a cutting path is calculated in a cutting path calculation step S3, and this is stored in the storage unit 2
4 can be stored.

As described above, one embodiment of the cutting path generating method of the present invention includes a condition inputting step in which the user inputs various conditions, a condition determining / deciding step in which the input conditions are used to determine the validity of the processing conditions, and A cutting path calculating step of calculating a cutting path from the condition, and the condition input step further includes an effective range input processing step of inputting a range in which the user precisely performs processing;
The method includes a division pattern input processing step in which a user inputs a surface roughness division pattern, and a processing condition input processing step in which a user inputs parameters for changing the surface roughness. The cutting path is created by using the database and the edge wear database to determine the validity of the conditions.

In another embodiment of the cutting path generating method of the present invention, a condition input step in which a user inputs various conditions,
It has a condition judgment / decision step of judging the validity of the processing condition from the input condition, and a cutting path calculation step of calculating a cutting path from the condition. An effective range input processing step of inputting a division pattern of a surface roughness by a user, and a processing condition input processing step of inputting a processing condition of an area to be finished most precisely by the user. -In the determining step, a cutting path is created by judging the validity of the condition and presenting an optimum value using the injection moldability database and the cutting edge wear database. In particular, in this embodiment, the user enters the conditions only in the range of the most necessary high-precision finishing, and the other devices present the processing conditions while referring to various DBs, so that the convenience of the software is increased.

In the present invention, in the above-described cutting path calculation step S3, as a method for determining the coarseness / fineness of the path (as a condition for changing the surface roughness), as shown in FIG. If the part enters the “effective range + machining allowance” (when it enters the range to be precisely finished), it is regarded as precision finishing. If the cutting line does not enter the “effective range + machining allowance” (enters the range to be precisely finished). (When it disappears) is used as a rough finish. Further, when the surface division pattern specified by the user and the calculated surface division pattern of the cutting path do not match, the precise, coarse, and precise pattern is used to make the place where the coarse area is narrow to be precise. For example, as shown in FIG. 14, it is assumed that the user has specified a surface division pattern of coarse / fine / rough. In the case where the machining path becomes rough, fine, coarse, fine, or coarse in the cutting path calculation step S3 due to the undulation of the processing surface, as shown in FIG. I do.

That is, in the present invention, in the cutting path calculation step S3, the conditions for changing the surface roughness include the machining direction 1
If any part of the line enters the “effective area + allowance”, it is regarded as precision finishing. If the cutting line does not fall within the “effective area + allowance”, it is regarded as rough finishing. When the calculated surface division pattern does not coincide with the calculated cutting path, a precise, rough, and precise pattern is used to make a fine finish in a narrow coarse area. As a result, even when an unexpected rough / fine pattern is formed due to the undulation of the machined surface, the cutting path can be applied to the pattern specified by the user, and the user's settings can be correctly executed.

As described above, according to the present invention, a desired processing accuracy can be achieved in consideration of the processing shape, the surface roughness to be changed, the formability, the cutting distance, and the tool friction. For example, an optical component such as a toric lens or a mirror surface piece of a mold can be finished with high precision.

In the cutting device shown in FIG. 1, the free-form surface cutting path creating device 20 can be realized by a general computer, for example, a personal computer.

Here, the functions of the processing means 23 such as the cutting path creation processing as shown in FIG. 10 are provided in the form of, for example, a software package (specifically, an information recording medium such as a CD-ROM). Can be.

In other words, the free-form surface cutting path creating apparatus 20 of the present invention causes a general-purpose computer system having an input device, a display, and the like to read a program recorded on an information recording medium such as a CD-ROM, The present invention can also be implemented in an apparatus configuration in which a microprocessor of the general-purpose computer system executes a cutting path creation process.
In this case, a program for executing the cutting path creation processing of the present invention (that is, a program used in the hardware system) is provided in a state recorded on a medium. Information recording media on which programs and the like are recorded are not limited to CD-ROMs.
An AM, a flexible disk, a memory card, or the like may be used. The program recorded on the medium is installed in a storage device incorporated in the hardware system, for example, a hard disk device, so that the program can be executed to realize a cutting path creation processing function.

[0082]

As described above, according to the first aspect of the present invention, a free-form surface processing machine for processing a workpiece,
A free-form surface cutting path creating device that creates a program for controlling the free-form surface machining device as a cutting path is provided. The free-form surface machining device and the free-form surface cutting path creating device are connected via a network, and the free-form surface cutting path creating device is provided. Is provided with processing means for creating a cutting path, and storage means for storing the cutting path created by the processing means. The cutting path stored in the storage means of the free-form surface cutting path creation device is provided with Sometimes, it is sent to a free-form surface processing machine through a network, and the processing means of the free-form surface cutting path creating apparatus has a precision as a sub-module for performing a division process for appropriate roughness of the surface of the workpiece. Equipped with multiple division means, it is possible to create a cutting path with reduced accuracy in places where accuracy is not required on one processing surface, resulting in shorter processing time Can increase productivity, reduce tool wear, it is possible to improve accuracy. In particular, according to the first aspect of the present invention, the processing unit of the free-form surface cutting path creating device includes a precision multiple dividing unit as a sub-module that performs a dividing process for appropriate roughness of the surface of the workpiece. Therefore, it is possible to perform a dividing process for appropriate roughness of the surface of the workpiece.

According to the second and third aspects of the present invention, a condition input step in which a user inputs various conditions, a condition determination / decision step in which the validity of a machining condition is determined from the input conditions, and a condition A cutting path calculating step of calculating a cutting path more, wherein the condition input step further includes an effective range input processing step in which the user inputs a range to be precisely machined, and the user inputs a division pattern of the surface roughness. A division pattern input processing step, and a processing condition input processing step in which a user inputs parameters for changing the surface roughness,
In the determination step, a cutting path is created by judging the validity of the conditions using the injection moldability database and the cutting edge wear database, and the user only needs to set parameters for changing the surface roughness. Since the device inputs and inputs the processing conditions while referring to various DBs, the convenience of the software is increased.

According to the fourth and fifth aspects of the present invention, a condition input step in which a user inputs various conditions, a condition determination / decision step in which the validity of a machining condition is determined from the input conditions, and a condition A cutting path calculating step of calculating a cutting path more, wherein the condition input step further includes an effective range input processing step in which the user inputs a range to be precisely machined, and the user inputs a division pattern of the surface roughness. A division pattern input processing step and a processing condition input processing step of inputting processing conditions of a region to be most precisely finished by a user are provided.
In the determination step, the cutting path is created by using the injection moldability database and the cutting edge wear database and judging the validity of the conditions, and presenting the optimum values. Since the conditions only for the range to be finished with high accuracy are input, and the others present the processing conditions while referring to various DBs, the convenience of the software is increased.

According to the sixth and seventh aspects of the present invention, in the cutting path generating method according to the second or fourth aspect, the conditions for changing the surface roughness in the cutting path calculating step include: Even a part of the line "Effective range +
When the cutting line enters the "cutting allowance", it is regarded as precision finishing. When the cutting line does not enter the "effective area + cutting allowance", it is regarded as the rough finishing. In addition, the surface division pattern specified by the user and the surface division pattern of the calculated cutting path are If they do not match, the precision, coarse, and precision patterns will be used to finish the narrow areas where the roughness is small. The cutting path can be applied, and the setting of the user can be executed correctly.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a cutting device according to the present invention.

FIG. 2 is a diagram illustrating a configuration example of a free-form surface processing machine.

FIG. 3 is an enlarged front view of a tool attached to the free-form surface processing machine of FIG. 2;

FIG. 4 is a model diagram of a tool portion and a workpiece of the free-form surface processing machine.

FIG. 5 is a view showing a processing procedure of a workpiece by the cutting device of FIG. 1;

FIG. 6 is a diagram showing a relationship between a cutting length and a shape accuracy by the cutting device of FIG. 1;

FIG. 7 is a diagram showing a relationship between a cutting length and a surface roughness by the cutting device of FIG. 1;

FIG. 8 is a diagram showing a state in which a machined surface of a workpiece is divided into an effective area and a non-effective area.

9 is a view showing the surface roughness of the Cp surface of the workpiece shown in FIG. 8;

FIG. 10 is a view for explaining a cutting path generation method of the cutting apparatus of FIG. 1;

FIG. 11 is a diagram for explaining an effective range and a margin on a gold piece;

FIG. 12 is a diagram for explaining a rough / fine processing range.

FIG. 13 is a diagram for explaining a method of determining the coarseness / fineness of a cutting path.

FIG. 14 is a diagram for explaining coarse / fine classification.

FIG. 15 is a plan view of a two-axis control NC processing machine.

16 is a right side view of a workpiece attached to the two-axis control NC processing machine in FIG. 15;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Free-form surface processing machine (NC processing machine) 11 X-axis table 12 Y-axis table 13 Z-axis table 14 Tool spindle 15 Tool holder 16 Tool 16a Single crystal diamond tool 20 Free-form surface cutting path creation device 21 Input / output means 22 Display means 23 Processing means 24 Storage means 25 Network I / F means 26 Precision multiple division means P Workpiece LN Network

Claims (7)

[Claims] A free-form surface processing machine for processing a workpiece;
A free-form surface cutting path creating device that creates a program for controlling the free-form surface machining device as a cutting path is provided. The free-form surface machining device and the free-form surface cutting path creating device are connected via a network, and the free-form surface cutting path creating device is provided. Is provided with processing means for creating a cutting path, and storage means for storing the cutting path created by the processing means. The cutting path stored in the storage means of the free-form surface cutting path creation device is provided with Sometimes, it is sent to a free-form surface processing machine through a network, and the processing means of the free-form surface cutting path creating apparatus has a precision as a sub-module for performing a division process for appropriate roughness of the surface of the workpiece. A cutting device comprising a plurality of dividing means. 2. A cutting path creating method for creating a program for controlling a free-form surface machining machine as a cutting path, wherein a user inputs various conditions and a condition inputting step, and the validity of the processing conditions is determined based on the input conditions. It has a condition judgment / decision step and a cutting path calculation step of calculating a cutting path from the condition,
The condition input step further includes an effective range input processing step in which the user inputs a range to be precisely processed, a division pattern input processing step in which the user inputs a division pattern of the surface roughness, and a user changing the surface roughness. Processing condition input processing step of inputting the parameters of the above, in the condition determination and determination step, by using the injection moldability database and the blade wear resistance database, by determining the validity of the condition,
A cutting path generation method, wherein a cutting path is created. 3. A recording medium on which a program for executing the cutting path generating method according to claim 2 is recorded. 4. A cutting path creating method for creating a program for controlling a free-form surface machining apparatus as a cutting path, wherein a user inputs various conditions and a condition inputting step, and the validity of the processing conditions is determined based on the input conditions. It has a condition judgment / decision step and a cutting path calculation step of calculating a cutting path from the condition,
The condition input step further includes an effective range input processing step in which the user inputs a range to be precisely processed, a division pattern input processing step in which the user inputs a division pattern of the surface roughness, and a division pattern input processing step in which the user finishes the most precisely. A processing condition input processing step of inputting processing conditions is provided, and in the condition determination / decision step, by using an injection moldability database and a cutting edge wear database, the validity of the condition is determined, and by presenting an optimum value, A cutting path generation method, wherein a cutting path is created. 5. A recording medium on which a program for executing the cutting path generating method according to claim 4 is recorded. 6. The cutting path generation method according to claim 2, wherein the condition for changing the surface roughness in the cutting path calculation step is such that even a part of one line in the processing direction is set to “effective range + offset”. When it enters, it will be a precision finish,
When the cutting line does not fall within the “effective range + allowance”, rough finishing is performed. In addition, when the surface division pattern specified by the user does not match the calculated surface division pattern of the cutting path, a fine, coarse, and precision pattern is used. A method for generating a cutting path, wherein a place where a rough region is narrow is precision finished. 7. A recording medium on which a program for executing the cutting path generating method according to claim 6 is recorded.