JP3156475B2 - Machining axis assignment information creation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining axis assignment information creating apparatus, and more particularly to a method for assigning a plurality of machining axes to a gear head of a machining machine on a CAD system.
The present invention relates to a tool having a function of determining an optimum assignment of a machining axis in consideration of a tool material and a machining time.

[0002]

2. Description of the Related Art In recent years, with the progress of computers and graphic displays and their peripheral technologies,
A designer (computer) using graphic information as a medium
A so-called CAD (computer-aided design) system for designing using a computer has been put to practical use, and its application range is expanding.

As a part of this, recently, it has been attempted to apply the CAD system to a tooling layout, for example, a work of allocating a machining axis to a gear head. That is, in a gear head having a plurality of output shafts for one input shaft, an operation of assigning a plurality of machining axes to the gear head is to be performed on a CAD system.

In general, when allocating machining axes, it is necessary to optimize cutting conditions in consideration of a tool material of each machining axis to be assigned, and to design the machining time so as not to exceed a predetermined possible machining time. No. However, at this stage, in the CAD system, when assigning a plurality of machining axes to the target gear head, the assignment of machining axes and the assignment of machining axes are changed in consideration of the tool material and machining time. There is no one that has the function of performing

[0005]

However, such a conventional machining axis assignment system on CAD is merely a drawing system, and the cutting conditions are corrected in consideration of the tool material, and the machining time is verified. Can not. That is, in the design performed on the CAD system, the technical backing cannot be incorporated, and the CAD system has not been used sufficiently effectively.

Further, in the conventional system, when the cutting conditions are changed by a design change, it is necessary to correct the cutting conditions and verify the processing time again on the desk. At this time, correcting the cutting conditions on the desk and verifying the processing time are extremely complicated work, and design changes can occur frequently in the actual design, so a great deal of design man-hour is required for each design change. become.

SUMMARY OF THE INVENTION The present invention has been made in view of such conventional problems, and performs a machining axis assignment operation on a CAD system, optimizes a cutting condition in consideration of a tool material, and reduces a machining time. It is an object of the present invention to provide a machining axis assignment information creating device capable of easily verifying a machining axis.

[0008]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a machining axis assignment defining means for assigning a machining axis to a target gear head based on preset machining axis information; For each group unit of the processed machining axis, a cutting condition correcting unit that corrects a preset cutting condition according to a predetermined rule, and the correction is performed based on a correction range of the cutting condition determined by a tool material. Cutting condition correction availability determination means for determining whether or not possible, correction tool combination selection means for changing the tool material of the machining axis based on the determination by this determination means, selecting a combination of correctable tool material, The cutting conditions are corrected for each combination of the selected tool materials, and the processing time is calculated based on the corrected cutting conditions to obtain the tool material with the shortest processing time. And group information determination means for determining a combination of the processing time based on the conditions determined by the group information determination means, workable time comparing to validate the pressurized <br/> Engineering possible time allocated for processing Verification means;
Is a machining axis assignment information creating device having

[0009]

According to the present invention, the processing axis allocation defining means allocates the processing axis to the target gear head based on the processing axis information. The cutting condition of the machining axis is corrected according to a predetermined rule. The cutting condition correction availability determination means determines whether or not the correction is possible based on the correction range of the cutting condition determined by the tool material. Change the tool material and select a combination of tool materials that can be corrected. Next, the group information determining means corrects the cutting conditions for each combination of the selected tool materials,
The machining time is calculated based on the corrected cutting conditions, and a combination of tool materials having the shortest machining time is determined. And
The processing time verification means is divided into the processing time based on the conditions determined by the group information determination means and the processing.
The determined machining time is compared, and it is verified whether or not the predetermined machining is completed within the machining time under the condition of the assigned machining axis. As a result of this verification, if predetermined processing cannot be performed within the allowable processing time, the processing axis is assigned again.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an external configuration of hardware in an embodiment of a machining axis assignment information creating apparatus according to the present invention, FIG. 2 is a conceptual diagram showing a software structure of the embodiment, and FIG. FIG. 4 is a flowchart showing a processing procedure in the embodiment.

As shown in FIG. 1, the hardware configuration of this embodiment is similar to the configuration of a general CAD system.
A graphic display device 10 as a display device,
The input device includes a light pen 11, a keyboard 12, a tablet 13, and the like on which a designer performs key operations and the like. The designer operates the light pen 11 and the like to input data, commands, and the like to the computer 14. An external storage device 15 is connected to the computer 14, and processing results, data, and the like of the computer 14 are stored therein. A plotter 16 and a printer 17 are connected to the computer 14 as output devices.
Draws a drawing of the machining axis assignment status, tooling layout, etc., as necessary, and prints data and calculation results.

Next, a description will be given of a use form of the machining axis assignment information creating apparatus according to the present embodiment. The processing location and processing dimensions of the part are determined, and the ideal cutting conditions are determined. Then, after determining the type of the processing equipment, the processing axis is assigned to the gear head.In the process, when processing axes having different processing dimensions and different cutting conditions are allocated to one gear head, It becomes necessary to make the feed speed (mm / min) the same. In other words, different feed speed values (mm / min) mean different cutting advance distances per minute for each machining axis attached to one gear head, which is physically impossible. It is.

In order to correct the feed speed (mm / min), the cutting speed (m / min) and feed amount (mm / rev), which are preset ideal cutting conditions, must be changed. In this change process, a machining axis assignment information creating device is used. Feed speed (mm / mi
Since the processing time changes when n) is corrected, the total processing time of the machine having the gear head under consideration also changes. Therefore, the machining axis assignment information creating device also verifies whether or not the total machining time falls within the machining available time.

A calculation formula for correcting the cutting conditions is shown below. Spindle speed S (rpm) and feed rate F
(Mm / min): S = cutting speed R (m / min) × 1000 / (working diameter (mm) × π) F = spindle rotation speed S (rpm) × feed amount V (mm /
rev).

An example of correction of the feed speed (mm / min) will be described below. The machining axis assigned to the same gear head is A
The axis and the B axis are used, and the processing diameter of each axis and ideal cutting conditions are as follows. A-axis B-axis Cutting diameter (mm) 6 8 Feed amount V (mm / rev) 0.12 0.12 Cutting speed R (m / min) 60 60 Calculating the ideal feed speed from ideal cutting conditions , A axis is 382.0 mm / min, B axis is 286.5
mm / min.

According to the rule that the feed speeds of all the machining axes assigned to the same gear head are made to coincide with the slowest, the A-axis can be adjusted from 382.0 mm / min to 2
Change to 86.5mm / min, B axis is 286.5mm
/ Min. In order to change the feed speed of the A-axis, it is necessary to correct the feed amount V or the cutting speed R of the A-axis. However, if the cutting speed R is fixed and the feed amount V is corrected, then (60 × 1000 / ( 6 × π)) × V = 286.5, a correction value of V = 0.09 mm / rev is obtained.

Whether the feed amount V or the cutting speed R is to be corrected depends on the processing type of the processing axis. For example, the feed amount V is corrected at the time of drilling and the feed amount V is corrected at the time of tapping. The cutting speed R is corrected.

The possible processing time is determined as follows. When a certain work is determined to be 10,000 units per month,
Assuming that the number of working days per month is 20 and the machining line operates for 8 hours a day, 500 pieces need to be produced per day. Therefore, 8 (hours) × 60/500 = 0.
It becomes 96 (minutes), and it is necessary to produce one work in 0.96 minutes. Further, assuming that the time required for transporting the work is 0.1 minute and the time required for setting the work on the jig is 0.1 minute, the time allocated to actual processing is 0.96-0. .1-0.1 = 0.76. This 0.76 minutes is the possible processing time of the considered machine.

Next, the software structure of this embodiment will be described. As shown in FIG. 2, the software structure includes a cutting condition file 35 for storing cutting condition information prepared for each material of the tool for each processing axis, and an axis for storing processing axis information prepared for each processing axis. And an information file 36. The cutting condition file 35 includes a cutting condition range determined by the material of the tool, more specifically, a maximum value and a minimum value of a cutting speed (m / min), and a feed amount (mm / min).
The maximum value and the minimum value of rev) are stored. On the other hand, in the axis information file 36, axis information determined for each processing axis, more specifically, processing diameter, cutting length, ideal cutting speed (m / min), ideal feed amount (mm / rev),
The type of tool material is stored.

A cutting condition correction module 37 for correcting the cutting conditions of each processing axis as a group of the processing axes allocated to one gear head while referring to the cutting condition file 35 and the axis information file 36.
And a group information file 38 for storing a result obtained by executing the correction processing. The group information file 38 includes group information prepared for each machining axis belonging to the group, more specifically, the group number, the determined cutting speed (m / min), and the determined feed amount (mm).
/ Rev), the determined type of tool material, and the determined cutting length are stored. The cutting length referred to here is not the actual distance at which the cutting operation is performed, but the distance at which the cutting operation is performed.

Further, based on group information defined for all the gear heads attached to one machine, it is verified whether or not the machine can be operated in a permissible machining time allowed for the machine, and the result is displayed on a screen. It has a result display module 39 for performing display processing. At the time of the verification, the processable time stored in the processable time condition file 40 in advance is referred to.

FIG. 3 is a block diagram showing the software structure in more detail. Cutting condition information storage unit 4 shown
5. The axis information storage unit 46, the group information storage unit 48, and the processable time condition information storage unit 49 correspond to the cutting condition file 35, the axis information file 36, the group information file 38, and the processable time condition information file 40, respectively. I do.

The cutting condition correction module 37 includes a command interpreting section 50 for processing data input from the keyboard 12 or the like, a processing axis allocation defining section 51 for identifying which processing axis has been allocated to a target gear head, A cutting condition automatic correction unit 52 for automatically correcting the cutting conditions of each processing axis in a group unit with the processing axes assigned to one gear head as one group, and a cutting condition information storage unit 45
A cutting condition correction availability determining unit 53 that determines whether an axis combination that cannot be automatically corrected has been designated by an operator while comparing the maximum value, the minimum value, and the like of the cutting speed R stored in the CPU with a cutting condition information storage unit 45 And a tool material selection unit 54 for selecting all combinations of tool materials that can be automatically corrected while referring to the information of the tool material. Further, a machining time calculation unit 55 that calculates a machining time for each combination of tool materials based on the cutting condition correction value calculated by the cutting condition automatic correction unit 52, and a tool time of the shortest tool material among the calculated machining times. And a group information determining unit 56 for selecting a combination and determining the combination and the cutting condition correction value as the determined value of the group information. Further, the group information determination unit 56 registers the determined value of the group information in the group information storage unit 48.

The gear head defined as group information is assigned to a machine (base machine). For example, in an FMS turret machine, a plurality of gear heads are held, and the time obtained by accumulating the machining time required for each assigned gear head. Is the total processing time in the turret machine. In order to verify the total processing time, the result display module 39 includes a processable time verification unit 57 that verifies whether or not the machine can operate in the processable time preset in the processable time condition information storage unit 49. , CR the verification result
And a result display control unit 58 for displaying the result on T10.

Next, the operation of this embodiment will be described with reference to the flowchart shown in FIG. First, an operator operates a CAD system in which a machining axis assignment information creating device is incorporated, and determines a part shape, a machining location, a machining type, and a machining dimension (machining diameter, machining depth, and the like). These CAD data are stored in a CAD database (not shown) or the like, and can be displayed on the CRT 10 at any time.

In step S1, the operator determines which machining axis is to be assigned to a target gear head while referring to machining axis information defined in advance. In this assignment work, since the positions of the holes to be machined are already determined, the position of the machining axis on the gear head is also defined with respect to the position of the gear head designated by the operator. In other words, if the work is displayed on the CRT 10 in a certain coordinate system, the gear head is superimposed on the displayed work while being shifted from the reference position, and specified at a predetermined position, the arrangement position of the machining axis on the gear head is determined. .

After the arrangement position of the machining axis is determined, the type of the machining axis is specifically specified. In this operation, when the operator designates a processing location on the CRT 10, the CAD system refers to the axis information file 36 and selects a tool on the CRT 10 based on information such as a processing type, a processing diameter dimension, and a cutting length dimension. Are displayed in a list, and then the operator designates a machining axis of a tool material considered appropriate from the list.

FIG. 5 shows an example of assignment of machining axes. Here, four drills 25a to 25d are assigned to the gear head 28. In the figure, reference numeral "30" is a gear head outer frame,
"31" is a gear head inner frame, "32" is a machining axis center point,
"33" is a bearing outer diameter, "P" is a shaft arrangable region which is a region where a machining shaft may be installed in the gear head,
“Q” is a dangerous area where a machining axis may be set, but requires attention, and “R” is an area where the machining axis is the gear head 28.
, The axis arrangement prohibition areas, which are areas where machining axes cannot be assigned physically, are shown. Each of the drills 25a to 25d is located in the shaft arrangement possible region P or the shaft arrangement risk region Q in the gear head inner frame 31, and is not allocated so that the bearing outer diameters 33 do not interfere with each other and do not interfere with the inner wall of the gear head 28. No. When a designation is made such that the position of the machining axis falls within the prohibited area R, a message to change the position of the gear head 28 and the like is displayed on the CRT 10, and the operator is alerted.

The assignment status data is stored in an assignment information database (not shown) or the like, and can be displayed on the display 10 as needed.
The data input from the keyboard 12 or the like is processed by the command interpreting unit 50, and the processing axis assignment defining unit 51 identifies which processing axis has been assigned to the target gear head. The processing axis group assigned to one gear head in this way is treated as one group.

Next, the automatic cutting condition correction section 52 starts automatic correction of the cutting condition of each machining axis in group units (S2). Since each machining axis in one group assigned to the gear head is driven by one motor, the feed speed F (mm / mi) of each assigned machining axis is used.
n) must be the same.

The automatic cutting condition correction unit 52 first reads the ideal cutting speed R and feed amount V specified in advance for each machining axis from the cutting condition file 35, and calculates the ideal cutting speed R and feed amount V based on the above-described formula. The typical feed speed F is calculated. This calculation is performed for all machining axes belonging to one group. The correction of the cutting condition is to correct the cutting speed R or the feed amount V, which is the cutting condition, for each machining axis so as to match the slowest feed speed F among the calculated feed speeds F. Whether to correct the cutting speed R or the feed amount V is determined by the processing type of the processing axis. Therefore, the correction of the cutting condition is performed by setting either the cutting speed R or the feed amount V (V) to a specified value. And the other R (V)
From the feed speed Fmin.

However, the maximum modifiable range of the cutting speed R and the feed amount V is limited by the tool material. Therefore, the cutting condition correction availability determination unit 53 refers to the maximum value and the minimum value of the cutting speed R and the feed amount V for each tool material recorded in the cutting condition file 35,
It is determined whether or not the cutting condition can be automatically corrected (S
3). This determination is made based on whether or not the correctable range of the cutting speed R or the feed amount V of the processing axis is at least partially duplicated in all the processing axes belonging to the group. FIG. 6 shows a case in which a combination of machining axes capable of automatically correcting such cutting conditions is designated, and a state in which the correctable ranges of the cutting speed R for all machining axes belonging to the group overlap. Has become.

On the other hand, FIG. 7 shows a case where a combination of machining axes for which the cutting conditions cannot be automatically corrected is designated, and the correction range (maximum value / minimum value) of the machining axis C corresponding to the designated tool material. Range) and the correctable range of other machining axes do not overlap. In such a case, the cutting condition correction availability determination unit 53 determines that an axis combination that cannot be automatically corrected has been specified, and the tool material selection unit 54 automatically selects the tool material while referring to the cutting condition file 35. Change (S4). When there are a plurality of combinations of tool materials that can be automatically corrected, the tool material selection unit 54 selects all of them. As shown in FIG. 7, as a result of changing the range of the minimum value and the maximum value by changing the tool material, the cutting conditions can be corrected.

The automatic cutting condition correction section 52 provides cutting conditions (cutting speed R, cutting speed R,
The feed amount V) is automatically corrected, and the processing time calculation unit 55 calculates the processing time for each combination based on the calculated cutting condition correction value (S5). Also, a group information determining unit 5
6 selects the shortest combination of tool materials from the calculated machining times (S5), and determines the combination and the cutting condition correction value as determination values of group information;
Register in the group information file 38. The result after the correction is displayed on the screen as shown in FIG. 8 (S6).

The gear head defined as group information is assigned to a machine (mother). In the case of an FMS turret machine, the machine holds a plurality of gear heads. The processable time verification unit 57 verifies whether or not operation is possible with the processable time preset in the processable time condition file 40 (S7). This verification result is displayed on the CRT 10 via the result display control unit 58 (S
8). FIG. 9 shows a display example. The illustrated example shows a state in which the machining time calculated for each turret is accumulated, and as a result, the machining time exceeds the available machining time.
If the calculated sum of the machining times is shorter than the possible machining time by, for example, 10 seconds or more, the assignment work is determined to be good. On the other hand, if the allowable processing time has been exceeded or if there is little allowance for the allowable processing time, a message “Instruct a turret to be changed” is displayed on the CRT 10.

When it is desired to change the processing time set for the gear head, all combinations of tool materials are selected again, and the processing time is calculated for each combination. Then, the result is displayed on a screen, and the user selects an optimum value from those candidates. Here, steps S4 and S5 described above operate only on the machining axis that is the correction target, so that at this stage,
It is not always the shortest processing time. Therefore, when the correction is performed so as to establish the possible machining time, the tool material is changed for all the assigned machining axes. For example, if a change is made from a general tool material to a high-performance tool material capable of high-speed machining for all machining axes, it is possible to further shorten the machining time after the correction in steps S4 and S5. it can.

According to the present embodiment, when allocating machining axes on the CAD system, it is determined whether machining axes can be assigned and the assignment is changed in consideration of the tool material and machining time. Therefore, technical support can be incorporated into the design on the CAD system. By appropriately correcting the assignment of the machining axis while performing such a simulation, it is possible to perform the assignment operation of the machining axis on the CAD system and to optimize the cutting conditions in consideration of the tool material. In addition to optimizing the cutting conditions, it is possible to control the processing time.

Further, in this embodiment, the design is automatically made on the CAD system according to the data and the operation program set in advance, so that there is no individual difference in the design by the person in charge of the design when changing the design. Can be unified. In addition, since the design is automatic, a significant reduction in design time is realized.

[0039]

As described above, according to the present invention, CA
On the D system, a machining axis assignment operation can be automatically performed in consideration of a tool material and a machining time, so that the efficiency of tooling layout design can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an external configuration of hardware in an embodiment of a machining axis assignment information creating apparatus according to the present invention.

FIG. 2 is a conceptual diagram showing a software structure of the embodiment.

FIG. 3 is a block diagram showing the software structure in further detail.

FIG. 4 is a flowchart showing a processing procedure in the embodiment.

FIG. 5 is a diagram showing an example of assignment of machining axes.

FIG. 6 is a diagram illustrating a case where a combination of machining axes capable of automatically correcting cutting conditions is designated.

FIG. 7 is a diagram illustrating a case where a combination of machining axes that cannot automatically correct a cutting condition is designated;

FIG. 8 is a diagram showing a display example in a process in which a determined value of group information is determined.

FIG. 9 is a diagram showing a display example in a process of verifying a processable time.

[Explanation of symbols]

35: Cutting condition file, 36: Axis information file, 37: Cutting condition correction module, 38: Group information file, 39: Result display module, 40: Machinable time condition information file, 51: Machining axis assignment definition part (Machining axis) Allocation definition means), 52: cutting condition automatic correction unit (cutting condition correction means), 53: cutting condition correction availability determination unit (cutting condition correction availability determination unit), 54: tool material selection unit (correctable combination selection means), 55: processing time calculation unit 56: group information determination unit (group information determination unit) 57: processing possible time verification unit (processing time verification unit) 58: result display control unit

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B23Q 15/00-15/28 G05B 19/18

Claims (1)

(57) [Claims] 1. A machining axis assignment defining means for assigning a machining axis to a target gear head based on machining axis information set in advance, and a machining axis group assigned by the defining means is preset for each group unit. Cutting condition correcting means for correcting the cutting conditions according to a predetermined rule; cutting condition correction availability determining means for determining whether or not the correction is possible based on a correction range of the cutting conditions determined by the tool material; The tool material of the machining axis is changed based on the judgment of the above, the correctable combination selecting means for selecting the correctable tool material combination, and the cutting conditions are corrected for each selected tool material combination, and this corrected A group information determining means for calculating a processing time based on the cutting conditions and determining a combination of tool materials having the shortest processing time; And machining time based on the conditions determined by the group information determination means, workable time and workable time verification means for comparing to validate, comprising a machining axis allocation information generating apparatus in sorted for processing.