JPH07314285A - Working shaft allotment information preparing device - Google Patents

Abstract

PURPOSE:To improve the precision for the allotment result of a working shaft to a gear hwad by installing a motor shaft revolution speed setting means for setting the motor shaft revolution speed of the working shaft group on the basis of the spindle revolution speed information and the gear ratio restriction value information. CONSTITUTION:A motor shaft revolution speed detting means 28 calculates the allowable motor shaft revolution speed of a working shaft on the basis of the spindle revolution speed information of the working shaft which is obtained by a spindle revolution speed calculating means 25 and the gear ratio restriction value information set by a gear ratio restriction value setting means 26, and determines the motor shaft revolution speed of a working shaft group on the basis of the spindle revolution speed information and the allowable motor shaft revolution speed information. When the motor shaft revolution speed can not be determined, the candidature working shaft for the cutting condition correction and the auxiliary correction information are outputted. When the motor shaft revolution speed can not be set, a cutting condition correcting means 29 corrects the cutting condition of a specific working shaft (candidature working shaft for correcting the cutting condition) on the basis of the result of the motor shaft revolution speed setting means 28 and the gear ratio restriction value information.

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 for allocating a plurality of machining axes to a gear head on CAD, and particularly, constraints on gear head design (gear ratio limit value, bearing arrangement position) and shift. The work of assigning the machining axis to the gear head is performed in consideration of the machining setting.

[0002]

2. Description of the Related Art In a conventional machining axis allocation information creating apparatus for allocating a plurality of machining axes to a gear head on a CAD system, in order to avoid a complicated work of modifying cutting conditions on a desk due to a design change, At the same time as assigning machining axes, the cutting conditions are optimized considering the materials of the workpiece and cutting tool based on the cutting power, and the machining time can be easily verified. (See, for example, JP-A-6-19521).

Here, the gear head is a device for rotating a plurality of processing shafts 50 via a rotating shaft 52a of a motor 52 as shown in FIG. Each processing shaft 50 through a gear 51
Be transmitted to. Each gear 51 is housed in the gear head 43.

[0004]

However, in such a conventional machining axis assignment information creating apparatus, whether or not gearing of the gear head 43 is possible is not taken into consideration when performing the task of assigning machining axes. Even if the cutting condition is determined in consideration of the cutting power, there is a possibility that the design of the gear head 43 is physically hindered. This is because the gear head 43 is limited in size and weight depending on the performance of the machine (the mother machine that holds the gear head 43) and the layout of production equipment. Therefore, it is desirable to construct a system that takes into account such structural constraints of the gear head 43 when performing the work axis assignment work.

For example, FIG. 10 is a diagram showing an example in which gearing is disabled even when the machining axis assignment is established.
The circles in the figure represent gears. In the figure, 4
The gears mounted on the respective ones of the machining axes W1 to W4 are all contained within the shaft disposable area P of the gear head 43. There is a difference between the three intermediate axes T1
Rotation is transmitted via ~ T3 (hereinafter referred to as the idle shaft). The rotational speed is increased or decreased during this transmission. However, in this example, one idle shaft T3 is out of the shaft disposable region P in order to realize the rotation speed of the machining shaft W4, and gearing is physically impossible.

Further, in the above apparatus, the presence / absence of shift processing setting is not considered at all. That is, when the shift machining is set, the gear ratio of the machining axis which is already assigned and defined may change. Since changing the gear ratio means changing the condition of the idle shaft, the shift ratio setting may not satisfy the gear ratio constraint condition. Therefore, it is also desired to carry out the work axis assignment work in consideration of the shift work setting.

Further, in the above apparatus, the bearing arrangement position is not considered at all, and it is not possible to automatically determine whether or not the bearing position can be corrected. That is,
As shown in FIG. 24, since the machining shaft 50 is a rotating body, it is held by the bearing 42. Usually, the bearing 42 is included in the structure (part) mounted on the machining shaft 50.
Has the largest outer diameter. Therefore, the outer diameter of the bearing becomes a constraint condition for the inter-axis pitch Ps of the adjacent machining axes (α axis and β axis), and the minimum value of the pitch (minimum inter-axis pitch).
Is determined. Specifically, the wall thickness of the H portion in FIG. 24 must be equal to or larger than the design allowable value, so the minimum inter-axis pitch is given by the following formula. Minimum inter-axis pitch = α-axis bearing radius + β-axis bearing radius + radial wall thickness tolerance value However, in some cases, due to design considerations (for example, when simultaneous machining is required), The machining axes may be arranged on the gear head in a positional relationship, which is possible by shifting the bearing positional relationship between the adjacent machining axes. That is, for example, when the positional relationship of the machined holes is such that simultaneous machining cannot be established, the structure of the gear head may be modified to shift the positional relationship of the bearings for the convenience of the number of machines and process settings to establish simultaneous machining. is there. In such a case, conventionally, as described above, since the bearing position is not taken into consideration at all, when the positional relationship of the processed holes is satisfied, the simultaneous processing is established (in other words, the bearing position is corrected). It is not possible to automatically determine how to correct the tooling layout diagram linked to the machining axis assignment information. Therefore, in order to efficiently perform accurate gear head design,
It is also desired to construct a system that takes into consideration such constraint conditions (bearing arrangement position).

The present invention has been made in view of the above-mentioned problems of the prior art, and also considers the constraint conditions (gear ratio limit value, bearing arrangement position) and shift machining setting on the gear head design on CAD. It is an object of the present invention to provide a machining axis assignment information creation device that can perform a task of assigning a machining axis to a gear head.

[0009]

In order to achieve the above object, a machining axis assignment information creating apparatus of the present invention comprises a cutting condition setting means for setting a cutting condition and its range, and a machining axis for allocating a machining axis to a gear head. Assigning means, spindle rotational speed calculating means for calculating the spindle rotational speed of the machining axis, and gear ratio limiting value setting means for setting the gear ratio limiting value based on the size of the gear head and the number of machining axes allocated to the gear head. And a motor shaft rotation speed setting means for setting the motor shaft rotation speed of the machining axis group based on the spindle rotation speed information and the gear ratio limit value information, and the motor shaft rotation speed setting means when the motor shaft rotation speed cannot be set. And a cutting condition correcting means for correcting the cutting condition of the specific machining axis based on the result of the above and the gear ratio limit value information.

The motor shaft rotational speed setting means calculates the permissible motor shaft rotational speed of the machining shaft based on the spindle rotational speed information and the gear ratio limit value information, and the spindle rotational speed information and the permissible motor rotational speed information. A means for determining the motor shaft rotational speed of the machining axis group based on the shaft rotational speed information, and a cutting condition correction candidate based on the spindle rotational speed information and the allowable motor shaft rotational speed information when the motor shaft rotational speed cannot be determined. It is configured to include a processing axis and a means for outputting correction auxiliary information.

Further, the cutting condition correction means is based on the result of the motor shaft rotation speed setting means (cutting condition correction candidate machining axis information and correction auxiliary information) and gear ratio limit value information. Of the cutting speed, and means for comparing the calculated cutting speed with the cutting condition range to judge whether or not the cutting condition can be corrected.

Further, the above-mentioned device has a shift machining judging means for judging the presence or absence of the shift machining setting based on the allocation information, and a gear ratio for changing the gear ratio limit value of the set step when the shift machining setting is made. Limit value changing means and a motor shaft for correcting the motor shaft rotational speed of the other step based on the gear ratio determined when the shift machining is set and the machining axis to be assigned is also used in the other step. And a rotation speed correction means.

Another machining axis assignment information creating apparatus of the present invention is a machining axis verification means for verifying a positional relationship between machining axes and creating machining axis combination information including bearing position correction availability information. Screen display creation means for creating a screen display that reflects axis combination information, processing axis deletion means for deleting information about the specified processing axis, and bearing position correction based on processing axis combination information and correction point information And a bearing position correcting means for selecting a machining axis to correct the bearing position.

The machining axis verification means determines the machining axis combination based on the machining axis allocation information, the bearing outer diameter information, the wall thickness allowable value information, and the machining axis position information. Means for verifying the pitch between machining axes and extracting machining axis combination candidates that require bearing position correction, means for verifying whether or not bearing position correction is possible for machining axis combination candidates, and machining axis combination candidate information. And means for creating machining axis combination information on the basis of the bearing position correction feasibility verification result.

Further, the above-mentioned bearing position correcting means is
A condition file in which the adverse effect that occurs when the bearing position of the machining axis is corrected is registered in advance as a point, and a means for calculating points while referring to the condition file for each machining axis and creating correction point information, A means for setting a group of machining axes that performs bearing position correction based on machining axis combination information, and verification of whether or not bearing position correction is possible for each group based on machining axis combination information and correction point information, and a correction candidate And a means for determining the bearing correction amount for the selected correction candidate.

The above-mentioned condition files include a condition file concerning hole position tolerance, a condition file concerning machined surface roughness, and a condition file concerning condition of machined surface at the machining position. It is preferable to set the distance between the bearing positions, the tool diameter, and the spindle diameter as keys.

Further, the above-mentioned device is configured to have means for adding the bearing correction amount to the spindle protrusion amount.

Further, the above-mentioned apparatus further comprises means for correcting the tooling layout drawing based on the corrected spindle protrusion amount.

[0019]

In the machining axis assignment information creating apparatus configured as described above, when the machining axis allocation work is performed on the CAD system, the cutting condition and its range are set by the cutting condition setting means. When the machining axis is assigned to the target gear head by the machining axis allocating means, the spindle rotation speed calculating means calculates the spindle rotation speed of the target machining axis, and the gear ratio limit value setting means determines the size of the gear head and the machining axis allocated thereto. The gear ratio limit value, which is a constraint condition in designing the gear head, is set based on the number of gears, and the motor shaft rotation speed setting means sets the motor shaft rotation of the machining shaft group based on the spindle rotation speed information and the gear ratio limit value information. Set the number. More specifically, the motor shaft rotation speed setting means calculates the allowable motor shaft rotation speed of the machining shaft based on the spindle rotation speed information and the gear ratio limit value information, and then determines the spindle rotation speed information and the allowable motor shaft rotation speed. The motor axis rotation speed of the machining axis group is determined based on the information, and when the motor axis rotation speed cannot be determined, the cutting condition correction candidate machining axis and correction auxiliary information are determined based on the spindle rotation speed information and the allowable motor shaft rotation speed information. Is output. When the motor shaft rotation speed cannot be set, the cutting condition correction means determines the cutting condition of the specific machining axis (cutting condition correction candidate machining axis) based on the result of the motor shaft rotation speed setting means and the gear ratio limit value information. To correct.
More specifically, the cutting condition correction means determines the cutting condition correction candidate machining axis based on the result (cutting condition correction candidate machining axis information and correction auxiliary information) of the motor shaft speed setting means and the gear ratio limit value information. The cutting speed is calculated, and the calculated cutting speed and the cutting condition range are compared to determine whether or not the cutting condition can be corrected.

When it is determined by the shift machining determining means that the target gear head has a shift machining setting, the gear ratio limiting value changing means changes the gear ratio limiting value of the step (machining axis group) already set. , Set the motor shaft speed again and check whether the shift machining setting is possible. Then, in a predetermined case, the motor shaft rotation speed correction means corrects the motor shaft rotation speed that has already been set so that the set step is satisfied.

Further, in another machining axis assignment information creating apparatus of the present invention, when performing the machining axis allocation work on the CAD system, the machining axis verification means determines the positional relationship between the machining axes. Verify and create machining axis combination information including bearing position correction availability information. More specifically, the machining axis-to-machining verification means determines the machining axis combination based on the machining axis assignment information, and then determines the machining axis based on the bearing outer diameter information, the wall thickness allowable value information, and the machining axis position information. The inter-axis pitch of is verified, and machining axis combination candidates that require bearing position correction are extracted. Then, the possibility of bearing position correction is verified for the machining axis combination candidate, and machining axis combination information is created based on the machining axis combination candidate information and the bearing position correction propriety verification result. When the machining axis combination information is created, the screen display creating means creates a screen display that reflects the machining axis combination information, and the machining axis deleting means displays, for example, information about the machining axis designated by the user who referred to the screen display. delete. Then, the bearing position correcting means selects a processing axis on which the bearing position correction is performed based on the processing axis combination information and the correction point information, and corrects the bearing position. More specifically, the bearing position correction means refers to various condition files for each machining axis (for example, hole position tolerance condition, machined part surface roughness condition, machining position machined surface condition condition) and points. And calculate
After creating the correction point information, set the group of processing axes to perform the bearing position correction based on the processing axis combination information, and for each set group, the bearing position based on the processing axis combination information and the correction point information. Whether or not correction is possible is verified, a correction candidate is selected, and a bearing correction amount is determined for the selected correction candidate.

The obtained bearing correction amount is added to the spindle protrusion amount, and the tooling layout diagram is corrected based on the spindle protrusion amount thus corrected.

[0023]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a perspective view showing an example of hardware constituting a machining axis assignment information creation device of the present invention. This device has a graphic display device 10 (hereinafter, simply referred to as a display), a light pen 11 and a keyboard 1 which a designer uses as an input device instead of a conventional drawing board or pencil as in the configuration of a general CAD system.
2 and a tablet 13 (hereinafter, the keyboard 12 will be used as a representative of the input device for simplification).
Data and commands can be input to the computer 14 by operating, for example. An external storage device 15 is connected to the computer 14, and processing results and data of the computer 14 are stored therein. Further, an automatic drafting machine (plotter) 16 and a printer 17 are connected as output devices to the computer 14 to draw various drawings such as machining axis allocation status and tooling layout as necessary, and to output data and calculation results. Can be printed.

First Embodiment FIG. 2 is a functional block diagram of a first embodiment of the above apparatus. In the present embodiment, the device has a function of assigning machining axes to gear heads in consideration of gearing availability of gear heads and presence / absence of shift machining settings.
For example, an initial information input unit 20 that inputs and processes initial information such as machining hole information and machining axis information, a cutting condition setting unit 21 that sets cutting conditions and their ranges, an allocation setting unit 22 that allocates machining axes to gear heads, A cutting condition correction unit 23 that corrects the cutting conditions in consideration of cutting power, a processing time verification unit 24 that verifies whether the machine can operate in a preset processing time, and a spindle rotation of the target processing axis. Spindle speed calculator 2 to calculate the number
5, a gear ratio limit value setting unit 26 that sets a gear ratio limit value in the gear head, a shift machining determination unit 27 that determines whether or not there is a shift machining setting in the target gear head,
Outputs data from a motor shaft rotation speed setting unit 28 that sets the motor shaft rotation speed in the target machining axis group, a cutting condition correction unit 29 that corrects the cutting conditions of a specific machining axis when the motor shaft rotation speed cannot be set, and data. Output processing unit 30 for processing
An initial information file 31 for storing initial information, a cutting condition file 32 for storing information on cutting conditions,
It is composed of an allocation information file 33 that stores allocation information of machining axes for gear heads, a gear ratio restriction information file 34 that stores gear ratio restriction information including a gear ratio restriction value, and a control unit (not shown) that controls all of these. These are internally connected to each other via the input / output interface 35, and are also connected to an external input device (keyboard 12, etc.) and output device (display 10, printer 17, plotter 16, etc.). The initial information file 31 is a memory area 31 that stores the processed hole information.
a, a memory area 31b for storing processing axis information, and the like.

The initial information input section 20 inputs initial information from the input device 12 or another CAD system by the operator and stores it in a predetermined memory area in the initial information file 31. As described above, the initial information includes the processing hole information and the processing axis information. The machining hole information is data that defines the machining type and shape parameters (machining diameter, depth, etc.) related to the machining hole, and the machining axis information is data that defines the machining axis corresponding to each machining hole. It has been transformed. Machining axis information includes tool specifications (tool type, diameter, length, etc.), holder specifications,
The bearing specifications, etc., and the arrangement information of each of these parts are held. FIG. 3 is a sectional view showing an example of the processing axis. In the figure, the machining axis is the drill 40 and the holder 4
1 and is attached to a spindle 44 of a gear head 43 via a bearing 42.

The cutting condition setting unit 21 sets the cutting condition and its range for each machining hole based on the input data from the input device 12 by the operator, and stores the set data in the cutting condition file 32. The cutting conditions consist of cutting speed (m / min) and feed amount (mm / rev), and the cutting condition range is composed of the minimum value and the maximum value thereof. That is, the cutting condition range is composed of the minimum and maximum values of the cutting speed and the minimum and maximum values of the feed amount.
Cutting conditions and range are determined by the material of the tool. Table 1 below shows an example of cutting conditions and ranges.

[0027]

[Table 1]

The assignment setting unit 22 assigns the machining axis to the target gear head according to the assignment instruction from the input device 12 by the operator, and stores the result (assignment information) in the assignment information file 33. FIG. 4 is a schematic diagram showing an example of allocation of machining axes. Here, the gear head 43
Are assigned to four drills 40a to 40d.
In the figure, “45” is the outer frame of the gear head, “46” is the inner frame of the gear head, “47” is the center point of the machining axis, “48” is the outer diameter of the bearing, “P” is the area where the shaft can be arranged, and “Q” is the axis. Axis placement risk area, “R” is the axis placement prohibition area, and each drill 40
a to 40d are shaft arrangement possible areas P in the gear head inner frame 46
And the bearing outer diameters 48 are assigned such that they do not interfere with each other. Further, the allocation information stored in the file 33 holds information regarding the size of the gear head and the number of machining axes allocated to the target gear head. For example, the size of the gear head is input by the operator, and the number of machining axes assigned is automatically counted.

Further, in the allocation information, when the shift machining is set for the target gear head, the step number is given to the machining axis which has already been set. Here, the step number represents the order or sequence of shift processing. For example, when four machining axes A, B, C and D are assigned to the same gear head, machining is first performed on the machining axes A and B, and then the arrangement position of the gear head is changed and the machining axis C is changed. When the next machining is performed with D (this is called shift machining), the machining with machining axes A and B is the first step, and the machining with machining axes C and D is the second step. In the present embodiment, the setting of the shift machining is realized by repeatedly performing the machining axis assignment work for the same gear head, and at that time, the step number is also automatically given.

The cutting condition correcting unit 23 automatically corrects the cutting conditions in consideration of cutting power when a plurality of machining axes are assigned to the target gear head. Specifically, when multiple machining axes are assigned to one gear head, it is necessary to make the feed rate (mm / min) in the cutting conditions the same in order to drive them with one motor. Correct the cutting conditions as such. Here, the feed rate is adjusted to the minimum value. The feed rate of the machining axis is calculated by the following formula. Feed rate (mm / min) = Spindle speed (rpm) x Feed rate (m
Then, the cutting power of each machining axis is calculated based on the modified cutting conditions, and the sum of them is calculated for each machining position.
Compare with the allowable cutting power value of the drive motor (output shaft). Then, if the total cutting power exceeds the allowable value, the cutting conditions are re-corrected so that the total cutting power falls within the allowable value due to the excess amount or the like. The cutting conditions corrected in this way are stored in the cutting condition file 32.

The workable time verifying section 24 verifies whether or not the machine can operate within a preset workable time. In other words, if the feed rate is modified, the machining time will change, and the total machining time of the machine that has the gear head under consideration will also change, so verify whether the total machining time falls within the available machining time. To do. Specifically, the total machining time of the machine is calculated by integrating the machining time required by each gear head assigned to the machine, and is compared with a preset allowable machining time of the machine. If the total machining time exceeds the machinable time, or if the margin for the machinable time is small, the tool material is changed to reduce the machining time. The cutting conditions corrected by changing the tool material are stored in the cutting condition file 32.

The spindle rotation speed calculation unit 25 is for calculating the spindle rotation speed of the machining axis to be assigned. The calculation is performed by the following formula. Spindle speed (rpm) = cutting speed (m / min) / (machining diameter
(mm) .pi. / 1000) Information on the calculated spindle speed is stored in the allocation information file 33 for each machining axis. The spindle rotation speed information is used when setting the motor shaft rotation speed and correcting the cutting conditions, as described later. In the above calculation, the cutting speed (m / min) is read from the cutting condition file 32, and the machining diameter (mm) is read from the machining hole information memory area 31a in the initial information file 31.

The gear ratio limit value setting unit 26 is stored in the gear ratio limit information file 34 based on the size of the target gear head stored in the assignment information file 33 and the number of machining axes assigned to the gear head. The limit value of the gear ratio is obtained with reference to the gear ratio limit information. That is, the above information is used to access the data obtained from past design results and the matched information is searched.
The gear ratio limit value represents a structural constraint condition of the gear head, and is composed of a minimum value and a maximum value. Further, the obtained gear ratio limit value is stored in the gear ratio limit information file 34 as gear ratio limit information in association with the size of the gear head and the assigned number of machining axes, and
It is also stored in the allocation information file 33.

As mentioned above, the gear ratio limit value represents a structural constraint condition of the gear head, and the reason is as follows. The axial arrangement possible area of the idle shaft is determined by the structural constraints of the gear head. That is, the shaft dispositionable area of the idle shaft is obtained from the size of the gear head and the number of processing shafts arranged (the weight is determined by the size). And from the positional relationship between the machining axis and the motor axis,
The condition of the idle shaft that can be inserted between them is determined. The idle shaft conditions are the number of idle shafts that can be inserted and the size of gears attached to the idle shaft. By changing the size of the latter gear, the rotation difference between the processing shaft and the motor shaft, that is, the gear ratio can be changed. Therefore, the gear ratio should be the maximum among the combinations of idle shaft conditions (for example, one idle shaft should be used to make the gear larger, or two idle shafts should be used to make the gear smaller). If the smallest one is selected and used as the gear ratio limit value, this reflects the structural constraint conditions of the gear head (see FIG. 10 above).

The shift working determination unit 27 refers to the allocation information file 33 and determines whether or not shift working is set for the target gear head. Specifically, referring to the allocation information file 33, it is determined whether or not the machining axis has already been set in the target gear head. If a machining axis exists, it is considered that the machining axis that is currently assigned is the shift setting. As will be described later, when the shift setting is made, a special process considering the shift setting is executed.

The motor shaft rotation speed setting unit 28 calculates the motor shaft rotation speed in the machining axis group. Calculation of the motor shaft rotation speed is a step that has already been set (machining axis group)
And the machining axis group to be currently assigned can be executed. In this case, the spindle speed information and the gear ratio limit value information stored in the allocation information file 33 are given. It also has a function of correcting the motor shaft rotation speed set in another step when the shift processing setting is set. Detailed processing contents will be described later.

The cutting condition correction unit 29 corrects the cutting condition of a specific machining axis when the motor shaft speed cannot be set. That is, when the spindle rotation speed of the machining axis that is the allocation target cannot be realized from the limit value of the gear ratio, that is, when the spindle rotation speed difference between the target machining axes is large and the motor shaft rotation speed cannot be set, This is to correct the cutting conditions of the machining axis. The correction is
It is performed within the range of cutting conditions (minimum value and maximum value). When the correction cannot be made within this range, it is determined that the machining axis allocation instruction is not appropriate and an allocation cancellation command is output to prompt the operator to change the allocation instruction. Information necessary for this correction is given from the motor shaft rotation speed setting unit 28 and the like. Detailed processing contents will be described later.

The output processing unit 30 outputs the processing results of the respective units 20 to 29 and the stored data in the respective files 31 to 34 and outputs them to the external display 10, printer 17, plotter 16, etc.

The cutting condition setting means is the cutting condition setting part 21, the machining axis allocating means is the allocation setting part 22, the spindle rotation speed calculating means is the spindle rotation speed calculating part 25, the gear ratio limit value setting means and the gear ratio limit value. The changing unit is the gear ratio limit value setting unit 26, the motor shaft rotational speed setting unit and the motor shaft rotational speed correcting unit are the motor shaft rotational speed setting unit 28, the cutting condition correcting unit is the cutting condition correcting unit 29, and the shift machining determining unit is the shift. Each processing determination unit 27 is configured.

Next, the operation of this apparatus will be described with reference to FIGS. 5 and 6 are flowcharts showing the operation of this device. First, prior to any processing, the initial information that forms the basis of the assignment work is defined. That is, the initial information input unit 20 inputs data from the input device 12 or another CAD system by an operator, defines a machining hole and a machining axis, and converts the data into data (S1). The defined initial information (machining hole information, machining axis information) is stored in a predetermined memory area of the initial information file 31. In addition,
If you want to use the already set data, S1
The process of can be omitted.

Then, the cutting condition setting section 21 determines, based on the input data from the input device 12 by the operator,
Cutting conditions (cutting speed (m / min) and feed amount (mm /
rev)) and cutting condition range (minimum and maximum values of cutting speed and feed amount) are set (S2). The set data is stored in the cutting condition file 32.

Then, the allocation setting unit 22 allocates the machining axis to the target gear head according to the allocation instruction from the input device 12 by the operator (see FIG. 4) (S).
3). The allocation result is stored in the allocation information file 33. Further, the number of assigned machining axes is automatically counted, and the result is stored in the assignment information file 33 together with the information about the size of the target gear head input by the operator via the input device 12 at that time. .

When the machining axis is assigned to the target gear head, the cutting condition correction unit 23 automatically feeds the feed rate (mm / mi
After modifying the cutting conditions so that (n) is adjusted to the minimum value, calculate the cutting power of each machining axis and re-correct the cutting conditions so that the total value of these cutting powers is within the allowable value The time verification unit 24 automatically integrates the machining time required by each gear head assigned to the machine to calculate the total machining time of the machine, and the total machining time falls within the preset possible machining time. In this way, the tool material is changed to shorten the processing time (S4). The modified cutting conditions are stored in the cutting condition file 32.

Then, the spindle speed calculator 25
Is the spindle speed of the machining axis that is the allocation target,
The calculation is performed according to the predetermined calculation formula described above (S5). The calculation result is stored in the allocation information file 33 for each machining axis.

Then, the gear ratio limit value setting unit 26 stores in the gear ratio limit information file 34 from the size of the target gear head stored in the assignment information file 33 and the number of machining axes allocated to this. The limit value (minimum value and maximum value) of the gear ratio is determined with reference to the gear ratio limit information (S6). The set gear ratio limit value is assigned to the allocation information file 33 and the gear ratio limit information file 3.
Store in 4.

Then, the shift working determination unit 27 refers to the allocation information file 33 and determines whether or not shift working is set for the target gear head. That is,
Referring to the allocation information file 33, it is first judged whether or not the machining axis has already been set for the target gear head. If there are already set machining axes, there is a machining axis with a step number among them. Decide whether to do it. If there is a machining axis with a step number, it is determined that shift machining is set (S7). If there is no shift machining setting, the process proceeds to S13.

On the other hand, when it is determined in S7 that the shift machining is set, the gear ratio limit value setting unit 26 determines, based on the current number of assigned axes, for the step (machining axis group) that has already been set. The limit value of the gear ratio is changed (S8).
The changed gear ratio limit value is stored in the allocation information file 33. The processing in S8 is performed because the gear ratio limit value is determined from the size of the target gear head and the number of axes to be allocated as described above. In the case of the shift processing setting, the processing axis is set in the target gear head. It will be added. When the gear ratio limit value is changed in this way, since the conditions related to the motor shaft speed are checked based on the gear ratio limit value before the change in the set step, it is possible to assign with consideration of shift machining. In order to determine, the motor shaft rotation speed needs to be recalculated for the set step based on the changed gear ratio limit value that matches the current situation.

S9 is a process for executing it. That is, the motor shaft rotation speed setting unit 28 determines the motor for the already set step (processing axis group) based on the spindle rotation speed information calculated in S5 and the gear ratio limit value reset in S8. The shaft speed is recalculated (S9).

FIG. 7 shows S9 of FIG. 5 (and S13 of FIG. 6).
It is a flowchart of the process of. In S9 and S13,
Since only the machining axis groups to be calculated are different (steps already set in S9 (machining axis group) and machining axis groups currently assigned in S13), it is assumed that they are common to both. explain.

The outline of the motor shaft rotation speed setting processing in S9 and S13 is that the gear ratio of the machining shaft having the maximum spindle rotation speed among the target machining shafts becomes 1.0 or cannot be satisfied. In this case, the motor shaft speed is set so that the number of machining shafts whose gear ratio is increased (greater than 1.0) is minimized. If the motor shaft rotation speed cannot be determined, all the machining axes whose cutting conditions are to be corrected (this is called a cutting condition correction candidate machining axis) are selected.

First, the target machining axes are sorted (sorted) in descending order (S21). In this embodiment, the target machining axes are arranged in order from the one having the highest spindle rotation speed. Then, the permissible motor shaft speed is calculated for each target machining shaft (S22). This allowable motor shaft speed consists of a minimum value (min) and a maximum value (max), and is calculated by multiplying the spindle speed by the gear ratio limit value. That is,
It is calculated by the following formula. Allowable motor shaft rotation speed min = Spindle rotation speed x minimum gear ratio limit value Allowable motor shaft rotation speed max = Spindle rotation speed x Gear ratio limit value maximum value A certain machining axis is selected and the spindle rotation speed x is determined (S23). Then, it is judged whether or not the x value obtained in S23 is within the range of the allowable motor shaft rotation speed of the other machining axis (S24), and the x value is within the range of the allowable motor shaft rotation speed of the other machining axis. If it is, the x value is set as the motor shaft speed of the target machining shaft group (S2).
5).

On the other hand, if it is determined in S24 that the x value is not within the range of the permissible motor shaft speeds of the other machining shafts, the permissible motor shaft speed ma is selected from the target machining shaft group.
The minimum value a of x is selected (S26), and the maximum value b of the permissible motor shaft rotational speed min is selected (S27). Then, it is judged whether or not the a value obtained in S26 is equal to or larger than the b value obtained in S27 (a ≧ b) (S28). If the a value is equal to or larger than the b value, the a value is set as the target machining axis. The number of rotations of the motor shaft of the group is set (S29).

On the other hand, if the value of a is not greater than the value of b in the determination of S28, it is determined that the motor shaft rotation speed cannot be set as it is, and the spindle is selected in order to select the cutting condition correction candidate machining axis. A permissible motor shaft rotational speed min value c of the machining shaft (selected in S23) having the maximum rotational speed is selected (S30), and the c value falls within the permissible motor shaft rotational speed range. While determining d (S31), the allowable motor shaft rotation speed max value e of the processing shaft having the minimum spindle rotation speed is selected from the target processing shaft group (S32), and is set within the allowable motor shaft rotation speed range. The machining axis into which the e value is entered and the machining axis number f are obtained (S33). And
The d value obtained in S31 and the f value obtained in S33 are compared, all machining axes that do not belong to the larger one are selected, and these are output as cutting condition correction candidate machining axes together with auxiliary correction information (S34). Here, the auxiliary correction information is the allowable motor shaft rotation speed min of the processing shaft having the smallest spindle rotation speed among the processing shafts belonging to the larger d value and f value,
It is composed of a permissible motor shaft rotation speed max of the machining shaft having the maximum spindle rotation speed. Further, in this case, the rotation speed of the motor shaft is indefinite.

The above will be described using a specific example. 8 is 4
The specifications of the two machining axes A to D are shown in FIG. 6A in the form of a table and in the form of a graph in the figure B. This data is S21 and S22
Obtained by Here, the gear ratio limit value is 0.8 to
It is calculated as 1.2.

First, the case where the target machining axes are A and B will be described. In this case, the machining axis having the highest spindle rotation speed is A, and its value is x = 3000 (rpm) (S23). This x value is within the range of the allowable motor shaft rotation speed of the machining axis B (S24). Therefore, the motor shaft speed is 3000 (rpm) (S25).

Next, the case where the target machining axes are A, B and C will be described. In this case, the machining axis with the highest spindle speed is A, and its value is x = 3000 (rpm).
(S23). This x value is within the range of the allowable motor shaft rotation speed of the machining axis B, but not within the range of the allowable motor shaft rotation speed of the machining axis C (S24). Therefore, the process proceeds to S26, and the machining axis having the minimum value of the allowable motor shaft rotation speed max is C, and the value is a = 2400 (rpm) (S26). Further, the machining axis having the maximum value of the permissible motor shaft speed min is A, and its value is b = 2400 (rp
m) (S27). Therefore, the condition of a value ≧ b value is satisfied (S28), and the motor shaft rotation speed is 2400 (r
pm) (S29).

Further, the case where the target machining axes are A, B, C and D will be described. In this case, the machining axis with the highest spindle speed is A, and its value is x = 3000.
(rpm) (S23). This x value is within the range of the permissible motor shaft speed of the machining axis B, but not within the range of the permissible motor shaft speed of the machining axes C and D (S24). Therefore,
Proceeding to S26, the machining axis having the minimum value of the allowable motor shaft rotation speed max is D, and the value is a = 1800 (r
pm) (S26). Also, the allowable motor shaft speed mi
The machining axis having the maximum value of n is A, and its value is b = 2.
It is 400 (rpm) (S27). Therefore, a value ≧ b
Since the value condition is not satisfied (S28), the process further proceeds to S30. The machining axis with the highest spindle speed is A
And the permissible motor shaft speed min value of this shaft is c = 2
It is 400 (rpm) (S30). Then, the machining axes whose c value is within the range of the permissible motor shaft speed are A, B, and C, and the number of machining axes is d = 3 (S31). The machining axis with the smallest spindle speed is C,
The permissible motor shaft speed max value for this shaft is e = 1800 (r
pm) (S32). Then, the machining axes whose e value is within the range of the allowable motor shaft rotation number are D and C, and the machining axis number is f = 2 (S33). Therefore, d
When the value and the f value are compared, the d value is larger, and the machining axis that does not belong to the larger one is D, so the machining condition correction candidate is the machining axis D. Further, the correction auxiliary information is the allowable motor shaft rotation speed min value (1 of the processing axes C having the smallest spindle rotation speed among the processing axes A, B, and C belonging to the larger one).
600 (rpm)) and the allowable motor shaft rotation speed max value of the machining axis A where the spindle rotation speed is maximum (3600 (rpm))
And (S34). In this case, the number of rotations of the motor shaft is indefinite.

When the processing of S9 is completed, it is confirmed whether or not there is a cutting condition correction candidate machining axis output from the motor shaft revolution number setting unit 28, and it is determined whether or not the motor shaft revolution number has been set ( S10). When the motor shaft speed can be set, the process proceeds to S13.

On the other hand, when the motor shaft speed cannot be set in S10, the cutting condition correction unit 29
Is a cutting condition correction candidate machining axis based on the cutting condition correction candidate machining axis and correction auxiliary information output from the motor shaft speed setting unit 28 and the gear ratio limit value stored in the allocation information file 33. Then, the cutting conditions are corrected to determine whether the cutting conditions can be corrected (S11).

The correction method is as follows. First, when the spindle speed of the cutting condition correction candidate machining axis is smaller than the allowable motor shaft speed min value (which is referred to as MIN) which is the correction auxiliary information, cutting speed (m / min) = machining diameter ( mm) / π / MIN / (100
0 x maximum gear ratio limit value) Also, the spindle speed of the cutting condition correction candidate machining axis is
If it is larger than the allowable motor shaft speed max value (this is referred to as MAX) that is the correction auxiliary information, cutting speed (m / min) = machining diameter (mm) · π · MAX / (100
The cutting speed is calculated by (0 × minimum gear ratio limit value). Then, if the calculated cutting speed is within the cutting condition range (minimum value and maximum value) of the cutting condition correction candidate machining axis, it is determined that the cutting condition can be corrected for the machining axis. Then, such processing is performed on all the cutting condition correction candidate machining axes, and if even one cannot be corrected, it is determined that the cutting conditions cannot be corrected as a whole.

If it is possible to correct all of the cutting condition correction candidate machining axes in the process of S11, the calculated correction value of the cutting condition is stored in the cutting condition file 32 for each machining axis (S12), and the process proceeds to S13. move on.

On the other hand, if even one cannot be corrected in the processing of S11, the cutting condition correction unit 2 of the present embodiment.
9 outputs an allocation cancellation command to cancel the machining axis allocation instruction (S17), and prompts the operator to change the allocation instruction. The assignment cancellation command may be output from the control unit (not shown) or the like, instead of the cutting condition correction unit 29.

At S13, the same processing as at S9 is performed.
It is executed for the machining axis group that is currently assigned. Here, the motor shaft speed is calculated using the gear ratio limit value set in S6. Further, in S14, in response to the result of S13, the same processing as in S10 is performed on the machining axis group to be assigned. Here, if the motor shaft speed can be set, the process proceeds to S19, and if not, S
Proceed to 15 and S for the machining axis group to be assigned
The same processing as 11 is executed. Then, if it is determined in S15 that the cutting condition can be corrected, the correction value is stored as in S12 (S16), and S19 is executed.
However, if it is determined that the correction of the cutting conditions is impossible, the process proceeds to S17, and the allocation cancellation command is output.

After the allocation cancellation command is output in S17, if the operator changes the allocation instruction via the input device 12 (S18), the process returns to S3.
The operations after S3 are repeated, but if not, the processing is ended.

When the motor shaft speed can be set for the machining axis group to be assigned, or when the cutting conditions can be corrected even if the motor shaft speed cannot be set, the motor shaft speed is set. The setting unit 28 is set to another step based on the determined gear ratio, on condition that there is shift setting processing and that the processing axis to be assigned is also used in another step (S19). The motor shaft rotation speed is corrected (S20), and a series of processing is ended. For example, it is assumed that the first step is set as shown in FIG. 9A (motor shaft rotation speed is 3000 (rpm)) and the second step is set as shown in FIG. 9B. In this case, the rotation speed of the motor shaft in the second step is 2340 (rpm) (see the flowchart in FIG. 7), so the gear ratio of the machining axis B is 0.78 (= 2340 (rpm) ÷ 3000 (rpm)). Become. Therefore, in order to establish the first step, the motor shaft rotation speed of the first step is set to 2340 (rpm) (= 3000 (r
pm) x 0.78).

Therefore, according to the present embodiment, when the machining axis is assigned on the CAD system, the gear head limit value is used to clear the structural constraint condition of the gear head, and each machining axis is processed. Since the cutting conditions of No. 1 are corrected by considering the motor shaft speed and the gear ratio limit value, the machining axis allocation is optimized considering the constraint conditions in the gear head design and the cutting conditions of each machining axis. Can be converted. Therefore, the accuracy of the machining axis assignment result can be improved. Furthermore, since the machining axes are assigned in consideration of the constraint conditions in the gear head design, it is possible to reduce the number of gear ring study steps and the number of gear head design steps in designing the gear head.

Further, in the present embodiment, since the machining axis assignment work is performed in consideration of the shift machining as well, the accuracy of the machining axis assignment result in the case where the shift machining is set is improved, the examination man-hour is reduced, and Design man-hours can be shortened.

Second Embodiment FIG. 11 is a functional block diagram of a second embodiment of the apparatus shown in FIG. The same parts as those in FIG. 2 are designated by the same reference numerals.

In the present embodiment, the above-mentioned device has a function of allocating machining axes to gear heads in consideration of other constraint conditions (bearing arrangement position) in gear head design, and is shown in FIG. Similar to the case of the first embodiment, the initial information input unit 20 for inputting initial information (machining hole information, machining axis information, etc.), the initial information file 31 for storing the inputted initial information, and the machining axis for the gear head. In addition to having an allocation setting unit 22 to be allocated and an allocation information file 33 that stores the set machining axis allocation information, a machining axis combination setting unit 60 that sets a combination of machining axes and verification of whether or not bearing position correction is possible are performed. The bearing position correction availability verification unit 61, the screen state creation unit 62 that creates the screen state to be displayed on the display 10, and the information that deletes the information about the designated machining axis. A shaft deletion processing section 63, a correction point information creation unit 64 for creating a correction point information, the correction candidate selection unit selects a candidate of the bearing position correction 65
And a correction amount calculation unit 6 for calculating the correction amount of the bearing position
6, a spindle protrusion amount correction unit 67 that corrects the spindle protrusion amount, a machining axis combination information file 68 that stores machining axis combination information, and a hole position tolerance condition file 69 that stores preset hole position tolerance conditions. , A machining portion surface roughness condition file 70 that stores preset machining portion surface roughness conditions, a machining surface state condition file 71 that stores machining surface state conditions at preset machining positions, and correction point information. A correction point information file 72 to be stored, which is internally connected to each other via the input / output interface 35 as in the case of the first embodiment of FIG.
2) and output device (display 10, printer 1)
7, plotter 16, etc.) are also connected.

The machining axis-to-machining verification means is the machining axis combination setting section 60, the bearing position correction availability verification section 61, the machining axis combination information file 68, the screen display creating means is the screen state creating section 62, and the machining axis deleting means is the machining. Axis deletion processing unit 63,
The bearing position correction means is the correction point information creation unit 64.
The correction candidate selection unit 65, the correction amount calculation unit 66, and the various condition files 69 to 71, respectively.

The machining axis combination setting unit 60 sets a combination of machining axes for which bearing position correction is required. Specifically, for example, the allocation information (including the number of allocated machining axes) set according to the machining axis allocation instruction from the operator is read from the file 33, and the machining assigned to the designated turret (in the case of a turret machine) is performed. Determine the axis combination. The number of combinations at this time is mathematically given by nC2, where n is the number of machining axes assigned to the designated turret. Then, the inter-axis pitch is verified for each combination (α axis and β axis), and machining axis combination candidates that require bearing position correction are extracted. Here, the verification of the inter-axis pitch is performed by comparing the minimum inter-axis pitch value (or the minimum inter-axis pitch) with the actually measured inter-axis pitch value. If the inter-axis pitch measured value is equal to or greater than the inter-axis pitch minimum value, it is not necessary to correct the bearing position, so the combination is excluded from the processing target. The minimum value of the inter-axis pitch and the measured value of the inter-axis pitch are calculated by the following formulas. Minimum axial pitch = α-axis bearing radius + β-axis bearing radius + radial wall thickness tolerance Actual value of inter-axis pitch = {(α-axis X coordinate-β-axis X coordinate) ² +
(Α-axis Y-coordinate-β-axis Y-coordinate) ² } ^1/2 Various information such as bearing radius, radial thickness tolerance, and machining axis position (X-coordinate and Y-coordinate) used in these equations is the initial information. Memory area 31b for machining axis information in the file 31
Read from. The processing result of the machining axis combination setting unit 60 is stored in the machining axis combination information file 68. For example, in the assignment state of the machining axes (A axis to G axis) shown in FIG. 12, the machining axis combination candidates to be extracted are BC,
There are four sets of C-D, D-E, and FG (number of axis combination information = 4).

The bearing position correction feasibility verification unit 61 verifies the bearing position correction feasibility for the machining axis combination candidates extracted by the machining axis combination setting unit 60. Specifically, with reference to FIG. 13, first, assuming that the bearing position of one α-axis is corrected, the actual wall thickness measurement values p and q are calculated by the following equations. Measured wall thickness p = Measured pitch between shafts Ps- (α-axis bearing radius r1 + β-axis N value / 2) Measured wall thickness q = Measured pitch between shafts Ps- (β-axis bearing radius r2 + α-axis M value / 2) Here, the actual measured value Ps between the axes is the machining axis combination setting unit 6
The values already calculated at 0 are used, and the bearing radii r1, r2 and the M and N values of each axis are read from the machining area information memory area 31b in the initial information file 31. If both the measured wall thickness values p and q are equal to or larger than a predetermined wall thickness allowable value (radial direction), it is determined that the α-axis bearing position can be corrected, and the bearing position correction enable / disable information is determined. The correction information flag is set to "1". The meaning of the correction information flag will be described later. On the other hand, if at least one of the obtained wall thickness measurement values p and q is less than the wall thickness allowable value (radial direction), it is determined that the α axis bearing position cannot be corrected, and the correction information flag is set. Is set to "0". Next, assuming that the bearing position of the other β-axis is corrected, the same processing as above is executed.
The processing result of the bearing position correction availability verification unit 61 is stored in the machining axis combination information file 68.

The machining axis combination information file 68 includes the result of the machining axis combination setting section 60 (candidate for machining axis combination) and the result of the bearing position correction availability verification section 61 (correction information flag).
Based on the above, the machining axis combination information of the format as shown in FIG. 14 is created and stored. here,
The meaning of the correction information flag is as follows. When the combination of the values of the correction information flags for the α-axis and the β-axis is (0,0), the pitch between axes is too small to allocate, and when (1,0), the α-axis The allocation can be made by correcting the bearing position, the allocation can be made by correcting the bearing position of the β axis in the case of (0,1), and the α axis or in the case of (1,1). Assignment is possible by correcting the bearing position of the β axis.

The screen state creating section 62 refers to the machining axis combination information to update the screen state displayed on the display 10. For example, as shown in FIG. 15, for the machining axis combination candidates, the center positions of the bearing outer diameters are connected with a line (this line is referred to as the axis center line). At this time, when the allocation is impossible, the solid line is connected, and when the bearing position correction is possible, the dotted line is connected. This is convenient for the operator who gives an instruction to cancel the machining axis assignment.

The method of reflecting the machining axis combination information on the screen display state is not limited to the method of the present embodiment. For example, as a method of reflecting the correction information flag, another line type may be used or the line width may be changed, and as a method of displaying the machining axis combination candidate, the line of the bearing outer diameter may be used. You may change the seed and line width. In the case of a color display, the colors may be changed.

The processing axis deletion processing section 63 deletes information relating to the specified processing axis. Specifically, the bearing outer diameter shape, the axis center line, and the machining axis combination information of the designated machining axis are deleted, and the number of axis combination information is updated (decreased). The operator designates the machining axis to be deleted while referring to the screen state created by the screen state creating unit 62. For example, in the example of FIG. 15, when the operator instructs to delete the E axis, the display 10
From the screen display of E, the bearing outer diameter shape of the E axis, the axis center line between the D axis and the E axis are deleted, the machining axis combination candidates including the E axis are deleted from the machining axis combination information file 68, and the number of axis combination information is set. Are updated to 3 sets. Further, the machining axis deletion processing unit 63 refers to the machining axis combination information (especially the correction information flag) in the file 68 to check whether or not there is no machining axis combination candidate that cannot be assigned on the designated turret. It also has a function. In the present embodiment, as will be described later, when there are machining axis combination candidates that cannot be assigned, the process cannot proceed to the next process.

The correction point information creation unit 64 targets the machining axes stored in the machining axis combination information and various condition files 69 to 71 (hole position tolerance condition, machining surface roughness condition, machining position machining). By referring to the surface condition), the information (correction point information) that points out the adverse effect that occurs when the bearing position is corrected is created and stored in the dedicated file 72. The storage format of the correction point information is as shown in FIG. 16, for example.

17 to 19 are tables showing examples of hole position tolerance conditions, machined surface roughness conditions, and machined surface condition conditions of machining positions. As shown in these figures, various condition files are pointed by using the distance L between the tool tip and the bearing position, the tool diameter, and the spindle diameter as keys. The processing surface state condition of the processing position includes an angle X formed between the processing direction and the processing surface 80, and a surface roughness Rmax of the processing surface 80 (FIG. 19A, respectively).
(B)). The surface roughness of the machined portion in FIG. 18 is the surface roughness Rmax of the machined portion (for example, the machined hole 81) (see FIG. 20 above). The points of various condition files should be set to appropriate values in advance by evaluating the adverse effects when the bearing position is corrected through experiments or the like.

The specific method of calculating points is as follows. For each machining axis stored in the machining axis combination information file 68, the hole position tolerance T, the surface roughness Rmax of the machining hole 81, the machining direction and the machining from the memory area 31a of the machining hole information in the initial information file 31 respectively. The angle X with the surface 80 and the surface roughness Rmax of the machining surface 80 are read, and the distance L between the tool tip and the bearing position, the tool diameter, and the spindle diameter are read from the memory area 31b of the machining axis information in the initial information file 31, respectively. By reading, based on these data, the corresponding points are extracted with reference to the various condition files 69 to 71, and the total value of the points extracted from each file is obtained. The angle X between the machining direction and the machining surface 80 may be calculated each time based on the machining direction data and the machining surface 80 position data, and the distance between the tool tip and the bearing position may be calculated. L may also be calculated by adding the tool protrusion amount, the holder length, and the spindle protrusion amount each time.

The correction candidate selecting section 65 selects a candidate for the bearing position correction based on the machining axis combination information and the correction point information. Specifically, first, referring to the machining axis combination information stored in the file 68, a group of machining axes for which bearing position correction is to be performed is extracted. Group extraction is performed by setting all machining axes that belong to machining axis combination candidates that include machining axes that are common to other machining axis combination candidates as the same group, and that belong to independent machining axis combination candidates that do not include common machining axes. To be a separate group. For example, taking the case of FIG. 14 as an example, assuming that the E axis has been deleted by the operator, the groups to be extracted are as shown in FIG.

Next, the machining axes are selected in order for each of the extracted groups, and the correctability of the correction is verified with reference to the machining axis combination information. The contents of the verification are as follows.
Here, the example of FIG. 21 will be described. First, verification is performed for group 1. First, it is assumed that the bearing position of the B axis is corrected. Referring to the processing axis combination information, the B axis can be corrected (correction information flag = 1). B
When the axes are corrected, the adjacent C axis cannot be corrected inevitably, so that the combination candidate CD is the correction candidate for the D axis. D axis can be corrected (correction information flag = 1)
Therefore, the B-axis bearing position correction is established. Therefore, the point total score is calculated with reference to the correction point information. In this case, since the bearing position is corrected for the B axis and the D axis (correction pattern), the total point is 10 + 8 = 18 (see FIG. 16). Then C
Suppose you want to correct the shaft bearing position. Referring to the machining axis combination information, since the C axis cannot be corrected in the BC combination candidate (correction information flag = 0), the C axis bearing position correction cannot be established. Next, it is assumed that the bearing position of the D axis is corrected. If the same processing as the above is carried out, it becomes the same as the bearing position correction pattern of the B-axis, so it is excluded from the candidates. That is, the candidate pattern based on the assumption that the bearing position of the D axis is corrected is not selected. Therefore, for group 1, one pattern (B axis and D axis) is selected as a bearing position correction candidate. Next, with respect to the group 2, the same processing as the above content is performed. In this case, one pattern (G axis) as a candidate for bearing position correction
Is selected.

In the above example, the number of candidates for each of group 1 and group 2 is one, so there is no opportunity to use the calculation result of the point total points. However, if the number of bearing position candidates is two or more. If so, the point total points are compared, and the candidate (pattern) having the smallest value is selected.

That is, the processing according to the number of candidates obtained as a result of the above verification is as follows. First, the number of candidates is 0
If so, the operator is informed of what machining axis to delete for each group to establish the machining axis combination. When the number of candidates is one as in the above example, the processing is continued as it is for the selected candidate. If the number of candidates is two or more,
The points are compared with each other, the candidate having the smallest value is selected, and the processing is continued. When there are two or more patterns in which the total point is the minimum value, for example, the operator arbitrarily selects a candidate (pattern) and continues the process. By performing such processing, it is possible to automatically select a pattern that minimizes the adverse effects of the bearing position correction when the product is processed.

The correction amount calculation unit 66 includes a correction candidate selection unit 65.
The correction amount of the bearing position is calculated for the candidate selected in. The correction amount is calculated by the following formula. Correction amount = bearing size + transverse direction wall thickness tolerance Here, the bearing size is the length in the horizontal direction of the bearing of the machining axis adjacent to the machining axis to be corrected, and the transverse direction wall thickness tolerance is For example, the allowable wall thickness value w in FIG.
Is. Each information of the bearing size and the lateral thickness allowable value used in the above formula is read from the memory area 31b of the machining axis information in the initial information file 31.

The spindle protrusion amount correction unit 67 corrects the spindle protrusion amount by adding the bearing position correction amount obtained by the correction amount calculation unit 66 to the spindle protrusion amount. That is, the spindle protrusion amount is corrected by the following formula, and the value of the spindle protrusion amount in the machining axis information memory area 31b of the initial information file 31 is updated: spindle protrusion amount = spindle protrusion amount + bearing position correction amount. The spindle protrusion amount J, together with the tool protrusion amount I and the like, is one of the parameters for creating the tooling layout diagram. Therefore, the above process allows the contents of the bearing position correction to be made when the tooling layout diagram is created (realized by the parametric figure function). It will be automatically fed back (see FIG. 22).

Next, the operation of this apparatus will be described with reference to FIG. FIG. 23 is a flowchart showing the operation of this device. Note that, here, various kinds of initial information (machining hole information, machining axis information, etc.) have already been set by the operator via the initial information input unit 20 and stored in the file 31, and machining axis assignment information (assigned). (Including the number of machining axes) is set via the assignment setting unit 22 according to a machining axis assignment instruction from the operator and stored in the file 33.

First, when the system is activated, the machining axis combination setting unit 60 reads machining axis assignment information from the file 33 (S40), and the machining assigned to the designated gear head, for example, the designated turret (in the case of a turret machine). The combination of axes is determined (S41). The number of combinations at this time is mathematically given by nC2, where n is the number of machining axes assigned to the turret, as described above.

Then, the machining axis combination setting unit 60 sets S
The inter-axis pitch is verified for each combination (α-axis and β-axis) obtained in 41, and machining axis combination candidates that require bearing position correction are extracted (S42). That is, as described above, from the machining axis information memory area 31b in the initial information file 31, the bearing radius of the machining axis (α axis and β axis) to be examined, the machining axis position (X coordinate and Y coordinate), and the radial thickness. After reading the allowable thickness value and substituting this information into a predetermined formula to calculate the minimum inter-axis pitch value and the actual measurement value between axes, compare the minimum inter-axis pitch value and the actual measurement value between inter-axis pitches, and The combination in which the measured value of the inter-pitch pitch is equal to or more than the minimum value of the inter-axis pitch is excluded from the processing target. For example, taking the machining axis assignment state (A axis to G axis) as shown in FIG. 12 (hereinafter the same), the machining axis combination candidate to be extracted is B-
There are four sets of C, C-D, D-E, and F-G (the number of axis combination information = 4).

Then, the bearing position correction availability verification unit 61 verifies the bearing position correction availability for the machining axis combination candidates extracted in S42. That is, first, assuming that the bearing position of one α-axis is corrected, the bearing radii r1, r2 and M of the machining axis (α-axis and β-axis) to be verified from the memory area 31b of the machining-axis information in the initial information file 31. Value and N value are read respectively, and these data and the inter-axis pitch actual measurement value Ps previously calculated in S42 are substituted into a predetermined formula to obtain the actual wall thickness measurement values p and q (see FIG. 13). Measured wall thickness p and q
Are both equal to or more than a predetermined wall thickness allowable value (radial direction), it is determined that the α-axis bearing position can be corrected, and the correction information flag as the bearing position correction availability information is set to “1”.
On the other hand, if at least one of the obtained measured wall thickness values p and q is less than the wall thickness allowable value (radial direction), α
It is determined that the shaft bearing position cannot be corrected, and the correction information flag is set to "0". Next, assuming that the bearing position of the other β-axis is corrected, the same processing as above is executed. Then, the machining axis combination information file 6
8 is processing axis combination information (see FIG. 14) based on the result (correction information flag) of the bearing position correction availability verification unit 61 and the result of the previous S42 (processing axis combination candidate).
Is created and stored in the dedicated file 68 (above, S4
3).

Then, the screen state creating section 62 sends the information to S43.
The screen state displayed on the display 10 is updated with reference to the machining axis combination information (combination candidate, correction information flag) created in step S44. For example, as shown in FIG. 15, for each combination candidate, a solid axis center line is drawn when allocation is impossible, and a dotted axis center line when allocation is possible by performing bearing position correction. pull.

Then, the processing axis deletion processing unit 63 causes the processing axis combination information (especially the correction information flag) in the file 68.
Based on the above, it is judged whether or not there is a machining axis combination candidate that cannot be allocated on the designated turret, in other words, there is a machining axis to be deleted (S45), and the result of this judgment is YES. If so, the operator S44
Wait until the machining axis to be deleted is designated by referring to the screen state created in (S46), and the bearing outer diameter shape and axis center line (solid line) of the designated machining axis are deleted from the screen display ( Processing axis combination information file 6 together with S47)
The machining axis combination candidate including the machining axis is deleted from 8 to update the contents of the machining axis combination information (S48), and the process returns to S45. That is, the processing of S46 to S48 is repeated until there are no machining axis combination candidates that cannot be assigned on the designated turret, and cannot proceed to the next S49 until there are no machining axis combination candidates that cannot be assigned. ing. For example, in the example of FIG. 15, the E axis is deleted according to the operator's instruction.

If the determination result in S45 is NO, that is, if there is no machining axis combination candidate that cannot be assigned on the designated turret, the correction point information creation unit 64
Correction point information for the machining axes stored in the machining axis combination information with reference to various condition files 69 to 71 (hole position tolerance condition, machining surface roughness condition, machining position state condition) (See FIG. 16) is created and stored in the dedicated file 72 (S49). That is, as described above, for each machining axis stored in the machining axis combination information file 68, the hole position tolerance T and the surface roughness of the machining hole 81 are respectively calculated from the memory area 31a of the machining hole information in the initial information file 31. The degree Rmax, the angle X between the machining direction and the machining surface 80, and the surface roughness Rmax of the machining surface 80 are read,
Similarly, the distance L between the tool tip and the bearing position, the tool diameter, and the spindle diameter are read from the memory area 31b of the machining axis information in the initial information file 31 (see FIG. 2).
0), based on these data, referring to the various condition files 69 to 71, the corresponding points are extracted, and the total value of the points extracted from each file is calculated.
Save as correction point information.

Then, the correction candidate selecting section 65 refers to the machining axis combination information stored in the file 68, and extracts a group of machining axes for which bearing position correction should be performed (see FIG. 21). After S50), the machining axis is selected in order for each of the extracted groups, and the file 6
Referring to the machining axis combination information in 8 and the correction point information in the file 72, the possibility of correction is verified according to the above-described predetermined logic, and a candidate for the bearing position correction is selected (S51). For example, in the above example, the B axis and D
The axis is selected, and the G axis is selected from group 2. At this time, if the number of candidates obtained as a result of the verification is 0, or if the number of candidates is 2 or more and there are 2 or more patterns in which the point total point is the minimum value, it is determined by the operator. This is the case as described above.

Then, the correction amount calculation unit 66 sets the bearing size of the machining axis adjacent to the machining axis information memory area 31b in the initial information file 31 and the lateral thickness allowable value for the candidate selected in S51. Is read, and the above information is substituted into a predetermined formula to calculate the bearing position correction amount (S52).

Then, the spindle protrusion amount correction unit 67
Adds the bearing position correction amount obtained in S52 to the spindle protrusion amount to correct the spindle protrusion amount (see FIG. 2).
2), the value of the spindle protrusion amount in the machining axis information memory area 31b of the initial information file 31 is updated (S5).
3).

Therefore, according to this embodiment, the information about the bearing outer diameter, the wall thickness allowable value, etc. is held for the inspection of the positional relationship of the machining axis, and it is determined whether the bearing position can be corrected based on these information. I decided to do so,
When performing machining axis assignment work on the CAD system, it becomes possible to automatically determine whether or not the bearing position can be corrected due to the structure of the gear head, considering the constraint conditions (bearing arrangement position) in the gear head design. , The machining axis allocation information will include the gearhead design know-how,
A stronger cooperation between the examination result and the actual design content can be achieved.

Further, in this embodiment, the machining axis for which the bearing position is corrected is automatically selected, and at that time, various condition files (hole position tolerance condition, machined part surface roughness condition, machining position By referring to the correction point information obtained by referring to (machined surface condition), the candidate that minimizes the adverse effect of bearing position correction is selected, so that the bearing position is ensured in the direction that guarantees the machining accuracy. It is possible to select a machining axis on which correction is performed.

Further, in this embodiment, the bearing position correction amount is calculated and added to the spindle protrusion amount, so that the bearing position correction content can be automatically fed back to the tooling layout diagram.

[0099]

According to the first to fourth aspects of the invention, since the machining axis allocation is optimized in consideration of the structural constraint condition (gear ratio limit value) of the gear head, the machining axis allocation result It is possible to improve accuracy, reduce man-hours for study, and shorten man-hours for design.

According to the fifth aspect of the invention, since the machining axis assignment is optimized in consideration of the shift machining setting, the precision of the machining axis assignment result at the time of the shift machining setting is improved, and the number of examination man-hours is reduced. And the number of design steps can be shortened.

According to the invention of claim 6, the allocation of the machining axis is optimized in consideration of the constraint condition (bearing arrangement position) in the gear head design. Therefore, the accuracy of the machining axis allocation result is improved, and the number of examination man-hours is increased. And reduction of design man-hours.

According to the invention of claim 7, in addition to the effect of the invention of claim 6, it is automatically determined whether or not the bearing position can be corrected due to the structure of the gear head. Since it includes know-how, it is possible to strengthen the cooperation between the examination result and the actual design content.

According to the inventions of claims 8 and 9, in addition to the effect of the invention of claim 6, a candidate is selected in which the adverse effect of the bearing position correction is minimized. Position correction can be performed.

According to the tenth and eleventh aspects of the invention, in addition to the effect of the sixth aspect of the invention, the contents of the bearing position correction can be automatically fed back to the tooling layout diagram.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of hardware constituting a machining axis assignment information creation device of the present invention.

FIG. 2 is a functional block diagram of a first embodiment of the apparatus shown in FIG.

FIG. 3 is a sectional view showing an example of a processing axis.

FIG. 4 is a schematic diagram showing an example of machining axis allocation.

FIG. 5 is a flowchart showing the operation of this embodiment.

FIG. 6 is a flowchart following FIG.

FIG. 7 is a flowchart for setting the motor shaft speed in FIGS. 5 and 6;

[Fig. 8] Chart showing specifications of machining axes

FIG. 9 is a diagram showing an example of step processing.

FIG. 10 is a schematic view showing another example of allocation of machining axes.

11 is a functional block diagram of a second embodiment of the apparatus shown in FIG.

FIG. 12 is a schematic view showing an example of machining axis allocation.

FIG. 13 is a diagram for explaining the verification of whether or not the bearing position can be corrected.

FIG. 14 is a diagram showing an example of machining axis combination information.

FIG. 15 is a diagram showing an example of updating the screen display state.

FIG. 16 is a diagram showing an example of correction point information.

FIG. 17 is a diagram showing an example of a hole position tolerance condition file.

FIG. 18 is a chart showing an example of a processed part surface roughness condition file.

FIG. 19 is a diagram showing an example of a machining surface state condition file of machining positions.

FIG. 20 is a diagram for explaining FIGS. 17 to 19;

FIG. 21 is a diagram showing an example of group extraction.

FIG. 22 is a diagram for explaining the spindle protrusion amount correction.

FIG. 23 is a flowchart showing the operation of this embodiment.

FIG. 24 is a diagram for explaining the bearing arrangement position.

FIG. 25 is a diagram for explaining a gear head.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Display 12 ... Keyboard 14 ... Computer 15 ... External storage device 16 ... Plotter 17 ... Printer 20 ... Initial information input part 21 ... Cutting condition setting part (cutting condition setting means) 22 ... Allocation setting part (machining axis allocation means) 25 ... Spindle rotation speed calculation unit (spindle rotation speed calculation unit) 26 ... Gear ratio limit value setting unit (gear ratio limit value setting unit, gear ratio limit value changing unit) 27 ... Shift machining determination unit (shift machining determination unit) 28 ... Motor shaft speed setting unit (motor shaft speed setting unit, motor shaft speed correcting unit) 29 ... Cutting condition correcting unit (cutting condition correcting unit) 60 ... Machining axis combination setting unit (machining axis verification unit) 61 ... Bearing Position correction availability verification unit (machining axis verification means) 62 ... Screen state creation section (screen display creation means) 63 ... Machining axis deletion processing section (machining axis deletion) Steps 64 ... Correction point information creation unit (bearing position correction means) 65 ... Correction candidate selection unit (bearing position correction means) 66 ... Correction amount calculation unit (bearing position correction means) 67 ... Spindle protrusion amount correction unit 68 ... Machining axis Combination information file (verifying means between machining axes) 69 ... Hole position tolerance condition file (bearing position correcting means) 70 ... Machining surface roughness condition file (bearing position correcting means) 71 ... Machining surface state condition file (bearing position correcting means) )

Claims (11)

[Claims] 1. A machining axis allocation information creating apparatus for allocating a plurality of machining axes to a gear head on a CAD, a cutting condition setting means for setting a cutting condition and its range, and a machining axis allocating means for allocating a machining axis to a gear head. Spindle rotation speed calculation means for calculating the spindle rotation speed of the machining axis, gear ratio limit value setting means for setting the gear ratio limit value based on the size of the gear head and the number of machining axes assigned to the gear head, and the spindle The motor shaft rotation speed setting means for setting the motor shaft rotation speed of the machining axis group based on the rotation speed information and the gear ratio limit value information, and the result of the motor shaft rotation speed setting means when the motor shaft rotation speed cannot be set. Machining condition allocation means for compensating the cutting condition of a specific machining axis based on the gear ratio limit value information, and the machining axis allocation information. Creation device. 2. The motor shaft rotation speed setting means calculates the allowable motor shaft rotation speed of the machining axis based on the spindle rotation speed information and the gear ratio limit value information, and the spindle rotation speed information and the allowable motor shaft rotation. A means for determining the motor shaft rotation speed of the machining axis group based on the number information, and a cutting condition correction candidate machining axis based on the spindle rotation speed information and the allowable motor shaft rotation speed information when the motor shaft rotation speed cannot be determined. And a means for outputting correction auxiliary information, the machining axis assignment information creating apparatus according to claim 1. 3. The cutting condition correcting means calculates a cutting speed of a cutting condition correction candidate machining axis based on the result of the motor shaft speed setting means and the gear ratio limit value information, and the calculated cutting speed. The machining axis assignment information generating device according to claim 1, further comprising: a unit that compares the cutting condition range with one another to determine whether the cutting condition can be corrected. 4. The cutting condition correction means calculates the cutting speed of the cutting condition correction candidate machining axis based on the cutting condition correction candidate machining axis information, the correction auxiliary information, and the gear ratio limit value information. 3. A machining axis assignment information creating device according to claim 2, further comprising: a means for comparing the cutting speed with a cutting condition range to determine whether or not the cutting condition can be corrected. 5. Shift processing determination means for determining whether or not there is shift processing setting based on allocation information, and gear ratio limit value changing means for changing the gear ratio limit value of a set step when there is shift processing setting. A motor shaft rotational speed correction means for correcting the motor shaft rotational speed of the other step based on the gear ratio determined when the shift machining is set and the machining axis to be assigned is also used in another step. The machining axis assignment information creating apparatus according to any one of claims 1 to 4, further comprising: 6. A machining axis allocation information creating device for allocating a plurality of machining axes to a gear head on CAD, which verifies a positional relationship between machining axes and creates machining axis combination information including bearing position correction availability information. Axis-to-axis verification means, screen display creation means that creates a screen display that reflects machining axis combination information, machining axis deletion means that deletes information about specified machining axes, and machining axis combination information and correction point information. A machining axis assignment information creating apparatus, comprising: a bearing position correcting means for correcting a bearing position by selecting a machining axis for which a bearing position is to be corrected based on the machining axis. 7. The machining axis verification means is means for determining a combination of machining axes based on machining axis allocation information, and machining axes based on bearing outer diameter information, wall thickness allowable value information and machining axis position information. Means for verifying the inter-axis pitch of the machining axis and extracting machining axis combination candidates that require bearing position correction, means for verifying whether or not the bearing position can be corrected for machining axis combination candidates, machining axis combination candidate information and bearings 7. A machining axis assignment information creating apparatus according to claim 6, further comprising: a unit that creates machining axis combination information based on a position correction feasibility verification result. 8. The bearing position correcting means calculates a point by referring to the condition file for each machining axis and the condition file in which the adverse effect caused when the bearing position of the machining axis is corrected is registered in advance as points. Then, based on the means for creating the correction point information, the means for setting the group of processing axes for performing bearing position correction based on the processing axis combination information, and the processing axis combination information and the correction point information for each group. 7. The machining axis assignment information according to claim 6, further comprising: means for verifying whether or not the bearing position can be corrected and selecting a correction candidate; and means for determining a bearing correction amount for the selected correction candidate. Creation device. 9. The condition file comprises a condition file concerning hole position tolerance, a condition file concerning machined surface roughness,
9. A condition file concerning a processing surface state of a processing position, and these various condition files are set by using a distance between a tool tip and a bearing position, a tool diameter, and a spindle diameter as keys. The processing axis assignment information creation device described. 10. The machining axis assignment information creation device according to claim 6, further comprising means for adding the bearing correction amount to the spindle protrusion amount. 11. The machining axis assignment information generating device according to claim 10, further comprising means for correcting the tooling layout drawing based on the corrected spindle protrusion amount.