JPH1165626A - Working load information detecting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily change cutting condition by detecting secular information with changes in time which indicates the level of the capability in the middle of cutting by a main shaft motor or the like. SOLUTION: In this device, a main axial load SFP is detected based on the load current value of a main axial motor 41, and the detected main axial load SFP is with respect to time stored. In this case, this device is provided with a working information detecting part 10, which determines and detects the cutting period of a cutting feeding command to be executed at the time of operating a prescribed working, and outputs a determined result HS according to a read working program, and a working information memory part 12 which stores the determined result HS. Then, this device is provided with a display 5 and a display arithmetic part 13, which display-output the first load information at the time of cutting feeding a polygonal line graph LG1 or the like with respect to time, based on the stored main axial load SFP and the determined result HS.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a processing load information detecting device for detecting time-dependent information of a processing load generated on a spindle motor or a feed shaft motor when performing processing with a machine tool.

[0002]

2. Description of the Related Art In a conventional NC machine tool such as a machining center, cutting conditions including a feed speed of a tool, a peripheral speed of a spindle, a rotation speed, and the like are stored in a machine memory in advance. According to the type and material of the workpiece, the material of the work to be processed, and the like, an appropriate one can be selectively set from the stored cutting conditions.

[0003]

The cutting conditions stored in the memory of the machine described above are safe numerical values such that the spindle motor and the feed shaft motor do not overload during cutting even with tools and workpieces of various materials. Therefore, it is a general-purpose numerical value that can correspond to tools and works of various materials. In other words, under such cutting conditions, it cannot be said that the numerical values are necessarily sufficient to realize high-speed machining.
Therefore, attempts have been made at actual machining sites to change the numerical values of the cutting conditions within the range of the capabilities of the spindle motor and the feed shaft motor, thereby realizing high-speed machining as much as possible. However, in order to change the numerical values of the cutting conditions within the range of the capabilities of the spindle motor and the feed shaft motor, the spindle motor and the feed shaft motor must use a certain percentage of their capacity during the cutting in the cutting conditions before the change. It is necessary to know the information over time about whether it is exerting. Conventionally, this information is only load information obtained from a load meter provided in the machine tool. In this case, only the load information of the spindle motor and the feed shaft motor at the moment can be known, and it is very difficult to change the numerical value of the cutting condition based on the load information.

[0004] In view of the above, the present invention can detect information over time as to what percentage of the spindle motor or feed shaft motor exerts its ability during cutting. It is an object of the present invention to provide a processing load information detection device that allows a user to easily change a cutting condition.

[0005]

That is, a first aspect of the present invention is a tool spindle (40) to which a tool (40a) can be detachably attached.
And a work mounting part (5) to which the work (60) can be mounted.
5), the first of which rotationally drives the tool spindle (40).
And a machining program memory section (6) for storing a machining program (PRO) having a command for cutting feed and an instruction for an operation other than cutting feed is provided, and the machining program memory section (6) is provided. In the machine tool (100) that reads out the machining program (PRO) stored in the computer and performs predetermined machining on the work (60) based on the machining program (PRO), the load of the first motor (41) is increased. Based on the current value, the first load (SF
P) has a first load detector (16, 21) for detecting
A first load memory unit (31) for storing the first load (SFP) detected by the first load detection unit (16, 21) with time; and the read processing program (PRO) Thus, the execution period (TM1, TM2, TM3, TM3) of the command of the cutting feed executed when the predetermined machining is performed.
...) And outputs a predetermined determination result (HS). The cutting state determination unit (10) is provided, and the cutting result (HS) output from the cutting state determination unit (10) is stored and stored. A state memory unit (12) is provided, and the first load (S) stored over time in the first load memory unit (31) is stored.
FP) and a first load that displays and outputs first load information (LG1) at the time of cutting feed in a time-dependent manner based on the determination result (HS) stored and stored in the cutting state memory unit (12). An information display output unit (5, 13) is provided.

According to a second aspect of the present invention, in the machining load information detecting device (1) according to the first aspect, the machine tool (100) includes the tool spindle (40) connected to the work mounting portion (55). ) Feed motors (45, 46, 47) that are driven to move relatively in a predetermined coordinate axis direction with respect to
The machining load information detecting device (1) detects a feed shaft load (XFP, YFP, ZFP) based on a load current value of the feed shaft motor (45, 46, 47). Load detectors (17, 19, 20, 22, 23,
25), and the feed shaft load detector (17, 19, 2)
0, 22, 23, 25), a feed axis load memory section (32, 33, 35) is provided for storing the feed axis load (XFP, YFP, ZFP) detected over time, and the feed axis load memory section is provided. Based on the feed axis loads (XFP, YFP, ZFP) stored over time in (32, 33, 35) and the determination results (HS) stored in the cutting state memory unit (12), cutting is performed. A feed shaft load information display output unit (5, 13) for displaying and outputting feed shaft load information (LG2 to LG4) at the time of feeding in a time-dependent manner is provided.

According to a third aspect of the present invention, in the machining load information detecting device (1) according to the first aspect, the first load memory unit (31) stores the first load memory unit (31) with time.
Load (SFP) and the cutting state memory unit (12)
The first load time average value (SFPb) of the first load (SFP) at the time of cutting feed is calculated based on the determination result (HS) stored and stored in the first load time average value (SFPb). Is provided to the first load information display section (5, 13), and the first load information display output section (5, 13) is provided with the first load average value. The first load time average value (SFPb) output from the calculation unit (11) is displayed and output together with the first load information (LG1).

According to a fourth aspect of the present invention, in the machining load information detecting device (1) according to the second aspect of the present invention, the feed axis load memory section (32, 33, 35) stores the information with time. Feeding of feed shaft loads (XFP, YFP, ZFP) during cutting feed based on feed shaft loads (XFP, YFP, ZFP) and judgment results (HS) stored and stored in the cutting state memory section (12). The axis feed time average value (XFPb, YFPb, ZFPb) is calculated, and the calculated feed axis load time average value (XFPb, YFPb, ZFP) is calculated.
a feed axis load average value calculating section (11) for outputting the feed axis load information display section (5, 13) to the feed axis load information display section (5, 13); The feed axis load time average values (XFPb, YFPb, ZFPb) output from the average value calculation section (11) are displayed and output together with the feed axis load information (LG2 to LG4).

According to a fifth aspect of the present invention, in the machining load information detecting device (1) according to the first aspect, the machining program (PRO) has a command for designating a tool to be used, and The state determination unit (10) executes an execution period (TM) of a cutting feed command to be executed at the time of performing the predetermined machining from the read machining program (PRO).
1, TM2, TM3,...) Are detected together with the tool to be used, and a predetermined determination result (HS) is output.

Note that the numbers in parentheses are for convenience of indicating corresponding elements in the drawings, and therefore, the present description is not limited to the descriptions on the drawings.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a machine tool provided with an example of a processing load information detecting device according to the present invention.
Is a schematic perspective view showing the vicinity of the spindle of the machine tool shown in FIG. 1,
FIG. 3 is a diagram conceptually illustrating a cutting state management table in a machining information memory unit, FIG. 4 is a diagram conceptually illustrating the inside of a spindle load memory unit, and FIG. 5 is a first diagram displayed on a display.
FIG. 6 is a diagram conceptually showing the inside of the Z-axis load memory unit, FIG. 7 is a diagram showing the second image displayed on the display, and FIG. 8 is a conceptual diagram of the inside of the X-axis load memory unit. 9 is a diagram showing a third image displayed on the display, FIG. 10 is a diagram conceptually showing the inside of the Y-axis load memory unit, and FIG. 11 is a fourth image displayed on the display. FIG. 12 is a diagram showing a fifth image displayed on the display.

A machine tool 100 such as a machining center includes
As shown in FIG. 1, the apparatus includes a processing load information detection device 1, and the processing load information detection device 1 includes a main control unit 2. The main control unit 2 includes a keyboard 3, a display 5, a processing program memory unit 6, a processing control unit 7, a processing information detecting unit 10, an average value detecting unit 11, a processing information memory unit 12, and a display via a bus line 2a. Calculation unit 13, peak value detection unit 15, spindle load value detection unit 16, X-axis load value detection unit 17,
Y-axis load value detector 19, Z-axis load value detector 20, spindle load calculator 21, X-axis load calculator 22, Y-axis load calculator 2
3. Z-axis load calculator 25, spindle motor controller 26, X-axis feed axis motor controller 27, Y-axis feed axis motor controller 2
9, Z-axis feed axis motor control unit 30, spindle load memory unit 3
1, X-axis load memory unit 32, Y-axis load memory unit 33, Z
The shaft load memory unit 35 and the like are connected. Further, as shown in FIG. 1 and FIG.
1 has a main shaft 40 that can be driven to rotate freely.
A tool 40 a such as a drill tool or a milling tool is detachably mounted on the main shaft 40. The spindle motor 41 is connected to the spindle load value detector 16 and the spindle motor controller 26 described above. Furthermore, the main shaft 40 is Z
By means of the shaft feed shaft motor 45,
The main shaft 40 can be moved and driven in the directions of arrows A and B in FIG. The Z-axis load value detection unit 20 and the Z-axis feed axis motor control unit 3
0 is connected to the Z-axis feed shaft motor 45. Also,
Below the main shaft 40 in FIG. 2, a table 55 on which a work 60 can be mounted is mounted on an upper surface by an X-axis feed shaft motor 46 and a Y-axis feed shaft motor 47. Arrows C and D in FIG.
It can be driven to move in directions indicated by arrows E and F in FIG. 2, which is a Y-axis direction perpendicular to the axis and the Z-axis.

Since the machine tool 100 and the processing load information detecting device 1 of the machine tool 100 have the above-described configuration, machining of the workpiece 60 using the machine tool 100 is performed as follows. For example, when the same machining is sequentially performed on a large number of workpieces 60, first the first workpiece 6
A test cut of 0 is performed as follows. When setting up the machining program PRO for performing this test cut, the feed rate of the tool, the peripheral speed of the spindle 40, the number of revolutions, and the like are set in a known automatic setting from the cutting conditions stored in the machine tool 100 in advance. (Of course, as another embodiment, the cutting conditions may be set automatically by the operator instead of automatically setting the cutting conditions).

The test cut is started when the operator inputs a processing start command via the keyboard 3. That is, the main control unit 2 reads the machining program PRO from the machining program memory unit 6 based on the command, and instructs the machining control unit 7 to perform predetermined machining based on the read machining program PRO. The machining control unit 7 drives the spindle motor 41 to rotate through the spindle motor control unit 26 based on the machining program PRO, and rotates the spindle 40 at the peripheral speed and the number of revolutions set in the machining program PRO. Drive, the X-axis feed axis motor control section 27 drives the X-axis feed axis motor 46, or the Y-axis feed axis motor control section 29 drives the Y-axis feed axis motor 47, or Z The Z-axis feed axis motor 45 is driven via the axis feed axis motor control unit 30 to move the main shaft 40 to the work 60 mounted on the table 55.
Relative to the X-, Y-, and Z-axis directions.
The tool 40a mounted on the spindle 40 is cut or fast-forwarded at a feed rate set in the machining program PRO in a form in which the tool 40a is appropriately moved and driven in a three-dimensional manner.
A predetermined cutting is performed on the work 60 by the tool 40a.

The machining control unit 7 drives the X-axis feed axis motor 46 via the X-axis feed axis motor control unit 27 or controls the Y-axis feed axis motor control unit 29 based on the machining program PRO. The main shaft 40 is driven to a predetermined tool change position with respect to the machine tool 100 by driving the Y-axis feed shaft motor 47 via the motor or the Z-axis feed shaft motor 45 via the Z-axis feed shaft motor control unit 30. At the same time, a known ATC device (not shown) is driven via an ATC device control unit (not shown), and the tool 40a of the main shaft 40 is driven.
Exchange. In this way, the workpiece 60 is subjected to machining and cutting such as drilling and milling by a plurality of tools while appropriately performing tool change.

By the way, the processing load information detecting device 1 of this embodiment detects the processing load information while performing the above-described test cut. That is, when the machining based on the machining program PRO is started as described above, the main control unit 2 controls the spindle load value detection unit 16, the X-axis load value detection unit 17, the Y-axis load value detection unit 19, and the Z-axis load value detection unit. 20 is started to detect the load. That is, the spindle load value detection unit 16 sequentially detects the load current value of the spindle motor 41 at a fixed time interval, thereby sequentially calculating and detecting the spindle load value SF acting on the spindle motor 41 from the current value. Detected spindle load value SF
Are sequentially transmitted to the spindle load calculating unit 21. Further, the X-axis load value detecting unit 17 outputs the X-axis feed shaft motor 4 at a certain time interval.
6, the X-axis load value XF acting on the X-axis feed shaft motor 46 is sequentially calculated and detected from the current value, and the calculated and detected X-axis load value XF is calculated by the X-axis load calculation unit. 22. Also, the Y-axis load value detection unit 1
9 sequentially detects the load current value of the Y-axis feed shaft motor 47 at a fixed time interval, and sequentially calculates and detects the Y-axis load value YF acting on the Y-axis feed shaft motor 47 from the current value. The detected Y-axis load value YF is used to calculate the Y-axis load
Are transmitted sequentially. Further, the Z-axis load value detecting unit 20 sequentially detects the load current value of the Z-axis feed shaft motor 45 at fixed time intervals, and determines the Z-axis feed shaft motor 4 from the current value.
5 is sequentially calculated and detected, and the calculated and detected Z-axis load value ZF is sequentially transmitted to the Z-axis load calculation unit 25.

In the spindle load calculating section 21, the spindle load value SF successively transmitted from the spindle load value detecting section 16 is subjected to a fixed sampling time by a known sampling method (in this embodiment, 5 seconds for convenience of explanation). However, the sampling time may be shorter or longer than that of the present embodiment), the maximum value SFa of the spindle load value SF during the sampling time is sequentially extracted, and the sampled maximum value SFa is The percentage with respect to the maximum load value SFm of the spindle motor 41 at the time is obtained, and the value is set as the spindle load SFP. The calculated spindle load SFP is sequentially transmitted to the spindle load memory unit 31.

The same operation as the above-mentioned operation in the spindle load operation unit 21 is also performed in the X-axis load operation unit 22, the Y-axis load operation unit 23, and the Z-axis load operation unit 25. 17 (Y-axis load value detector 19, Z-axis load value detector 2
0), the maximum value XFa (Y) of the X-axis load value XF (Y-axis load value YF, Z-axis load value ZF) sequentially transmitted.
Fa, ZFa) are sequentially extracted, and for the sampled maximum value XFa (YFa, ZFa), the X-axis feed shaft motor 46 (Y-axis feed shaft motor 47, Z-axis feed shaft motor 4
The X-axis load XFP (Y-axis load YFP, Z-axis load ZFP), which is a percentage of the maximum load value XFm (YFm, ZFm) for 5), is sequentially calculated. The calculated X-axis load XFP (Y-axis load YFP, Z-axis load ZFP) is sequentially transmitted to the X-axis load memory unit 32 (Y-axis load memory unit 33, Z-axis load memory unit 35).

As shown conceptually in FIG. 4, the spindle load SFP calculated first (ie, the time after the start of machining is 0-5 seconds) is stored in the spindle load memory unit 31.
Are stored in a plurality of storage positions SK1 in the form of a storage position SK1, a storage position SK2,... For storing the spindle load SFP (ie, a value at the time after the start of machining of 5 to 10 seconds) calculated secondly. , SK2, ..., SK80, ...,
Are formed. Therefore, the spindle loads SFP calculated and transmitted by the spindle load calculator 21 are sequentially stored and stored in corresponding storage positions SK1, SK2,..., SK80,.

The X-axis load memory unit 32, the Y-axis load memory unit 33, and the Z-axis load memory unit 35 also have the configuration shown in FIGS.
0, the X calculated first as conceptually shown in FIG.
A storage position XK1 (YK1, ZK1) for storing the axial load XFP (Y-axis load YFP, Z-axis load ZFP), the second calculated X-axis load XFP (Y-axis load YFP, Z-axis load Z)
FP), XK2 (YK2, ZK2),
.., A plurality of storage locations XK1 (YK1, Z
K1), XK2 (YK2, ZK2),... XK80 (Y
K80, ZK80) are formed. Therefore,
X-axis load XFP calculated and transmitted by X-axis load calculator 22 (Y-axis load calculator 23, Z-axis load calculator 25)
(Y-axis load YFP, Z-axis load ZFP) are sequentially stored at corresponding storage positions XK1 (YK1, ZK1) and XK2 (YK
2, ZK2), XK80 (YK80, ZK80)
, Are stored over time.

In the test cut illustrated here,
Assuming the start of machining as time 0 seconds, rapid traverse positioning and tool change are performed between time 0 seconds and time 5 seconds. Therefore, as shown in FIG. 4, the spindle load SFP between the time 0 seconds and the time 5 seconds is 0% (the rotation of the spindle 40 is stopped). On the other hand, as shown in FIGS. 6, 8, and 10, the X-axis load XFP between time 0 seconds and time 5 seconds,
The Y-axis load YFP and the Z-axis load ZFP are large values exceeding 100%, indicating that the main shaft 40 is rapidly traversed in the X-axis, Y-axis, and Z-axis directions. Similarly, time 1
From 00 seconds to 105 seconds, from 250 seconds to time 2
Fast traverse positioning and tool change are also performed during 55 seconds. From FIGS. 4, 6, 8, and 10, the spindle load SFP,
The characteristics of the magnitudes of the X-axis load XFP, the Y-axis load YFP, and the Z-axis load ZFP are shown in substantially the same manner as in the case between the time 0 seconds and the time 5 seconds described above. Fast-forward positioning is also performed between time 5 seconds and time 30 seconds, between time 105 seconds and time 120 seconds, between time 255 seconds and time 270 seconds, and between time 380 seconds and time 400 seconds. As shown in FIGS. 6, 8, and 10, the X-axis load XFP, the Y-axis load YFP, and the Z-axis load ZFP are temporarily set to 100.
%. In this rapid traverse positioning, as shown in FIG. 4, when the spindle load SFP is to be cut immediately (other than the time between 380 seconds and 400 seconds), the rapid traverse positioning time is used for the spindle. The value temporarily exceeds 100% because it is necessary to increase the rotation speed to a predetermined rotation speed in a short time. Furthermore,
Cutting is performed by cutting feed from time 30 seconds to time 100 seconds, from time 120 seconds to time 250 seconds, and from time 270 seconds to time 380 seconds, as shown in FIGS. 4, 6, 8, and 8. As shown in FIG. 10, the spindle load SFP, the X-axis load XFP, the Y-axis load YFP, and the Z-axis load Z depend on the cutting state.
FP has been issued. In addition, from time 30 seconds to time 100
Since the feed is performed only in the Z-axis direction during the second, the X-axis load XFP and the Y-axis load YFP keep a substantially constant low value, and between the time 120 seconds and the time 250 seconds, the X-axis load and the Y-axis load Z-axis load ZFP
Keeps a substantially constant low value, and from time 270 seconds to time 380 seconds, the feed is performed only in the X-axis and Z-axis directions, so that the Y-axis load YFP keeps a substantially constant low value.

By the way, in the machining load information detecting device 1, when the machining based on the machining program PRO is started as described above, the main control section 2 causes the machining information detecting section 10 to start detecting various kinds of machining information. That is, the processing information detection unit 10
Is, from the processing program PRO being read,
The block currently being executed is a block other than “cutting feed” from the block that commands “cutting feed” (for example, “rapid feed”)
At which the cutting state changes, or the time at which the cutting state changes ST1, ST
2,..., (In the present embodiment, the time is in units of seconds with the processing start time being 0, and specifically, the time is 30 seconds, 100 seconds, 1
20 seconds, ... etc. In addition, the time 0 second at the start of processing is unconditionally detected. ) Are sequentially detected. When the processing information detecting unit 10 detects the times ST1, ST2,..., The processing information PRO reads the processing programs PRO and reads the cutting states immediately after the times ST1, ST2,. That is, it is determined whether the feed is the cutting feed or not, depending on whether the block instructs “cutting feed” or not, and issues a determination result HT (for example, in the case of the cutting feed, the determination result HT is “ 1 ", and if not cutting feed, the determination result HT is a signal of" 0 "). Further, the processing information detection unit 10 determines the cutting result HT (that is, “1”) as the cutting feed.
Is output from the block of the processing program PRO being read, the cutting periods TM1, TM2, TM3,... (For example, in this embodiment, the cutting period TM1 It is 70 seconds from 30 seconds to 100 seconds, and the cutting period TM2 is 130 seconds from 120 seconds to 250 seconds, and the cutting period T
M3 is 110 seconds from time 270 seconds to time 380 seconds. ) Is detected. Further, the processing information detection unit 10
When a determination result HT (that is, “1”) that is a cutting feed is issued, a tool to be used in cutting of the block is determined from the read tool information specified for the block of the machining program PRO. To detect. That is, the tool numbers T1, T2, T3,... Of the used tool are detected.

The processing information detecting unit 10 detects the times ST1, ST2,...
.., And the cutting periods TM1, TM2, TM3,..., The tool number T1,
The determination result HS including T2, T3,... Is sequentially transmitted to the processing information memory unit 12. As shown conceptually in FIG. 3, the cutting information management table K
T is set. Therefore, the determination results HS transmitted to the processing information memory unit 12, that is, the times ST1, ST2,
..., and the judgment result HT, and the cutting periods TM1, TM
2, TM3, ..., and tool numbers T1, T2, T3, ...
.. Are stored at predetermined positions in the cutting state management table KT. For example, as shown in FIG.
T2,... Are sequentially arranged at the position of the “cutting state change time”, and the judgment result HT is set at the position of the “cutting flag” arranged in a form corresponding to the “cutting state change time”. When the HS indicates the cutting feed, the time ST1 is set to “1”, and when the HS indicates the cutting feed is not set, the time is set to “0”.
ST2,... Are arranged corresponding to the cutting period TM1,
, TM2, TM3, ... are arranged at the positions of the "cutting period" in correspondence with the times ST2, ST4, ..., and "1" of the determination result HT. Also, the tool numbers T1, T2, T
, ..., at the position of the "tool No." arranged in correspondence with the "cutting state change time" and the "cutting flag", the times ST1, ST2, ..., and the determination result HT " 1 ". (Note that, in the present embodiment, the “cutting state change time” shown in FIG.
Since the time is in units of 5 seconds, such as seconds,..., The unit time of each load detection is set to a unit of 5 seconds, as shown in FIGS. 4, 6, 8, and 10. I made it. Therefore, when the “cutting state change time” is a time in units of less than 5 seconds, for example, a time in units of 3 seconds, the unit time of each load detection is also set in units of 3 seconds. Is desirable. )

As described above, the spindle load SFP and the X-axis load X
After performing the test cut while detecting and storing the FP, the Y-axis load YFP, and the Z-axis load ZFP and determining and storing the processing information which is the determination result HS, the operator performs processing load information via the keyboard 3. Enter the output instruction. The main control unit 2 receiving the input command causes the average value detection unit 11 to detect the load average value. That is, the average value detection unit 11 determines the cutting period TM1 (TM2, TM3,...) Of the cutting state management table KT shown in FIG.
..), The spindle load memory unit 31, the X-axis load memory unit 32, the Y-axis load memory unit 33, and the Z-axis load memory unit 3.
5, the spindle load SFP and the X-axis load XF
Of the P, Y-axis load YFP and Z-axis load ZFP, those corresponding to each cutting period TM1 (TM2, TM3,...)
Time average for each of the main axis, the X axis, the Y axis, and the Z axis, and load average values SFPb, XFPb, YFP
b and ZFPb are transmitted to the processing information memory unit 12, respectively. Load average value SF transmitted to processing information memory unit 12
Pb, XFPb, YFPb, and ZFPb are stored at predetermined positions in the cutting state management table KT. For example, as shown in FIG. 3, it is arranged at a position of “average spindle load value (X-axis load average value, Y-axis load average value, Z-axis load average value)” in a form corresponding to “cutting period”.

In the peak value detecting section 15, the cutting period T in the cutting state management table KT of the machining information memory section 12 is set.
Based on M1 (TM2, TM3,...), The spindle loads SFP stored respectively in the spindle load memory unit 31, the X-axis load memory unit 32, the Y-axis load memory unit 33, and the Z-axis load memory unit 35, X-axis load XFP, Y-axis load YF
In the P, Z axis load ZFP, the cutting period TM1 (TM
2, TM3,...) Which are the maximum values of the load peak values SFPc, XFPc, YFPc, and ZFP.
c is detected for each of the main axis, the X axis, the Y axis, and the Z axis, and transmitted to the processing information memory unit 12. Load peak values SFPc, XFPc, YFPc, ZF transmitted to the processing information memory 12
Pc is stored in a predetermined position of the cutting state management table KT. For example, as shown in FIG. 3, it is arranged at the position of “spindle load peak value (X-axis load peak value, Y-axis load peak value, Z-axis load peak value)” in a form corresponding to “cutting period”.

As described above, the load average values SFPb, XFP
b, YFPb, ZFPb and load peak values SFPc, XF
When detecting Pc, YFPc, and ZFPc, the load average value and the load peak value during cutting feed are detected based on the “cutting period” in the cutting state management table KT. For example, a load that temporarily shows an extreme value due to fast-forward positioning or the like is excluded when the load average value and the load peak value are detected. Thereby, the processing load information displayed and output (described later)
From, you can distinguish and recognize only those related to cutting,
At the time of cutting, it is possible to accurately know information about the load of the motors 41, 45, 46, and 47 operated. In addition, the load average value and the load peak value are calculated for each of the individual cuts (that is, the cutting periods TM1, TM
, TM3,..., Etc.), the motors 41, 45,
It is possible to accurately know information on how much load the 46 and 47 operate. As a result, modification and change of a machining program, which will be described later, can be handled in a detailed manner, which is convenient.

Thereafter, the main controller 2 instructs the display calculator 13 to create an image. That is, the display calculation unit 13 creates the first image GZ1, as shown in FIG. The first image GZ
For 1, the horizontal axis represents time (in seconds, with the starting time of machining being 0),
Set the graph G1 with the vertical axis as the spindle load (unit%),
On the graph G1, as shown conceptually in FIG. 4, the respective storage positions SK1, SK2,.
The spindle load SFP stored in K80 is plotted as a line graph LG1. Similarly, the display calculation unit 13 creates the second image GZ2 (the third image GZ3 and the fourth image GZ4) as shown in FIG. 7 (FIGS. 9 and 11). Also in the second image GZ2 (the third image GZ3 and the fourth image GZ4), the horizontal axis is time (seconds when the processing start time is 0), and the vertical axis is Z-axis load (X-axis load, Y-axis load: unit). %) And the graph G2
(G3, G4) are set, and this graph G2 (G3, G4) is set.
4) Above, as shown conceptually in FIG. 6 (FIGS. 8 and 10), each storage position ZK1 (XK1, XK1, XK1) of the Z-axis load memory unit 35 (X-axis load memory unit 32, Y-axis load memory unit 33). YK
1), ZK2 (XK2, YK2), ..., ZK80 (X
The Z-axis load ZFP (X-axis load XFP, Y-axis load YFP) stored in K80, YK80) is plotted to form a line graph LG2 (LG3, LG4). Note that the graph G1
When creating (G2, G3, G4), the display operation unit 1
3 is a cutting state management table K in the processing information memory unit 12.
Based on the cutting periods TM1, TM2, TM3,... Of T, a line graph LG1 of a portion corresponding to the cutting periods TM1, TM2, TM3,.
(LG2, LG3, LG4) is displayed in a different color from other parts (parts corresponding to non-cutting), or the background color on the graph G1 (G2, G3, G4) is displayed in the cutting period T.
It is desirable to change and display a portion corresponding to M1, TM2, TM3,... And other portions. Thereby, the state of the load at the time of cutting can be recognized very clearly.

Further, the display calculation unit 13 performs load average values SFPb, ZFPb, XFPb, YFPb and load peak values SFPc, ZFPc, XFPc, YFP stored in the cutting state management table KT of the machining information memory unit 12.
c on the corresponding graphs G1, G2, G3, G4, these load average values SFPb, ZFPb, XFPb, YFP
b and load peak values SFPc, ZFPc, XFPc, Y
Cutting periods TM1, TM2, TM3,.
..., for example, line graphs LG1, LG
2, lines LH1, LH2, L of different colors from LG3, LG4
H3, LH4 and lines LJ1, LJ2, LJ3, LJ4 are displayed. The tool numbers T1, T2, T3,... Stored in the machining information memory unit 12 are represented by graphs G
1, G2, G3, G4, these tool numbers T1, T
2, T3,... Correspond to the cutting periods TM1, TM2,
According to the position of TM3,..., For example, each graph G
1, a numerical value, a symbol, or the like is displayed at the tool number display position KH on G2, G3, G4.

The first image GZ1, created as described above,
The second image GZ2, the third image GZ3, and the fourth image GZ4 are transmitted from the display operation unit 13 to the display 5 and displayed thereon (this display is divided into four parts and all the images GZ1 to GZ4 are displayed simultaneously). Or keyboard 3
Or the like, one image may be selectively displayed on one screen.) Images GZ1 to GZ displayed in this way
The operator who has seen the processing load information by the operator 4 performs the main spindle motor 41, the X-axis feed axis motor 46, the Y-axis feed axis motor 47, and the Z-axis feed axis motor 4 while performing each cutting.
It is possible to easily and visually know the time-dependent information on how much load the 5 has operated. Therefore, during the test cut, the motors 41, 45, 46, 47 are subjected to the load 50, for example, as in the cutting between the time 120 seconds and the time 250 seconds.
% (Average value 50% or less) and peak value 50%
If there are inefficient cuts less than%,
Since this can be easily found by looking at the processing load information by the image display, the numerical values such as the feed speed and the peripheral speed of the spindle at the inefficient cutting portion are increased based on the processing load information. It becomes easy to modify and change the machining program in the form.

It is also known that the load on the motors 41, 45, 46, 47 corresponds to the magnitude of the tool load acting on the tool 40a performing cutting. Therefore, from the graphs G1 to G4 of the images GZ1 to GZ4 and the tool numbers T1, T2, T3,... Displayed simultaneously, it is easy to estimate how much load has been applied to each of the various tools used for machining. be able to. Therefore, when modifying and changing the machining program by increasing the numerical values such as the feed speed and the peripheral speed of the spindle in the inefficient cutting portion, the feed speed and the peripheral speed of the spindle and the like within the tolerance of the tool. It is also possible to achieve higher machining efficiency by increasing the numerical value or replacing the tool with a higher-performance one.

As described above, after modifying the machining program in such a manner as to increase numerical values such as the feed speed at the inefficient cutting portion and the peripheral speed of the spindle, based on the machining load information based on the image display on the display 5, The machining of the remaining plurality of workpieces 60 is performed based on the modified machining program. Thereby, extremely high-speed machining is performed while making the most of the capabilities of the motors 41, 45, 46, 47.

In the embodiment described above, the display 5
In the above, the load information on the main axis, the X axis, the Y axis, and the Z axis is displayed, but the load information on the XY axis (or the YZ axis or the XZ axis) may be displayed similarly. It may be. For example, as shown in FIG.
The load calculation unit 36 is connected. When the display calculation unit 13 creates an image, the display calculation unit 13 also creates the fifth image GZ5 shown in FIG. That is, the fifth image G
Similar to the images GZ1 to GZ4, a graph G5 in which the horizontal axis represents time (seconds) and the vertical axis represents load (%) is set as Z5. Then, the display calculation unit 13 includes a second load calculation unit 36.
To calculate the load. That is, the second load calculator 3
Reference numeral 6 denotes a value obtained by averaging the X-axis load XFP stored in the storage position XK1 of the X-axis load memory unit 32 and the Y-axis load YFP stored in the storage position YK1 of the Y-axis load memory unit 33 at the corresponding time. The load is calculated and output to the display calculation unit 13, and the X-axis load XFP stored in the storage position XK2 of the X-axis load memory unit 32 and the Y-axis load YFP stored in the storage position YK2 of the Y-axis load memory unit 33 are calculated. Is calculated as the load at the corresponding time and the display calculation unit 13
The load at each time on the XY axis is calculated and output to the display calculation unit 13 in the form of. The display calculation unit 13 plots the load at each time when the calculation and output regarding the XY axes are output on the graph G5, and plots the line graph LG5.
And In addition, similarly to the images GZ1 to GZ4, the display of the load average value and the load peak value is also performed by averaging the load average value XFPb on the X axis and the load average value YFPb on the Y axis, and the load peak value XFPc on the X axis. And the load peak value YFPc on the Y axis averaged. Also, the tool numbers T1, T2, T3,..., Etc. may be displayed in correspondence with the time in the same manner as the images GZ1 to GZ4. Thus, the XY axis (or the YZ axis or the X-axis)
By displaying the load information on a plurality of axes in a combined form (as in the case of the Z axis), it is convenient to easily grasp comprehensive load information.

In the above embodiment, the machine tool 100
Is a machining center or the like, but other machine tools such as a lathe can be applied instead of the machining center.

[0034]

As described above, the first aspect of the present invention is a table 55 having a tool spindle such as a spindle 40 to which a tool such as a tool 40a can be detachably mounted and to which a workpiece such as a workpiece 60 can be mounted. And a first motor such as a spindle motor 41 that rotationally drives the tool spindle. A machining program such as a machining program PRO having a command for cutting feed and a command for operation other than cutting feed is provided. A machining program memory unit such as a machining program memory unit 6 for storing and storing, a machine tool 100 for reading a machining program stored in the machining program memory unit, and performing predetermined machining on a workpiece based on the machining program; In the machine tool of (1), a spindle load value detection unit 16 for detecting a first load such as a spindle load SFP based on the load current value of the first motor. It has a first load detection unit such as the main shaft load calculation unit 21, first detected by the first load detector 1
A first load memory unit such as a spindle load memory unit 31 that stores and stores the load of the machining with time is provided, and a cutting period of a cutting feed command to be executed when the predetermined machining is performed from the read machining program is provided. A cutting state determining unit such as a processing information detecting unit 10 for determining and detecting the execution period of TM1, TM2, TM3,... And outputting a predetermined determination result HS or the like is provided. A cutting state memory unit such as a processing information memory unit 12 for storing and storing the determined results is provided, and the first load stored over time in the first load memory unit and the cutting state memory unit stored in the cutting state memory unit. A display 5 for displaying and outputting the first load information at the time of cutting feed such as the line graph LG1 in a time-dependent manner based on the determined determination result, and a first load information display output unit such as the display calculation unit 13 are provided. Form was. Therefore, it is easy to know, with the displayed first output information, the time-dependent information as to what load the first motor was operated at the time of cutting feed, that is, what percentage of its capacity was exerted. be able to. For example, in the predetermined machining, when there is a period in which the performance of the first motor is not sufficiently exerted and the cutting is performed inefficiently, it is easily found by the first load information displayed and output. Therefore, based on this information, it is easy to modify and change the machining program in the form of increasing the feed rate, the peripheral speed of the spindle, and the like for the cutting during the inefficient cutting. The first load information to be displayed and output is information at the time of cutting feed based on the determination result. Therefore, for example, information in which a load that temporarily indicates an extreme value by rapid traverse positioning or the like is excluded, that is, cutting is performed. It will be accurate information on load over time. As a result, it is convenient to correct and change the machining program.

According to a second aspect of the present invention, in the machining load information detecting device according to the first aspect, the machine tool is arranged such that the tool spindle is relatively positioned with respect to the workpiece mounting portion in a predetermined coordinate axis direction. Z-axis feed axis motor 45, X-axis feed axis motor 46, and Y-axis feed axis motor 47 that are driven to move
And the like, and the processing load information detecting device detects a feed shaft load such as an X-axis load XFP, a Y-axis load YFP, and a Z-axis load ZFP based on a load current value of the feed shaft motor. X-axis load value detector 17, Y-axis load value detector 19, Z-axis load value detector 20, X-axis load calculator 2 to be detected
2. An X-axis load memory having a feed axis load detecting unit such as a Y-axis load calculating unit 23, a Z-axis load calculating unit 25, etc., and storing the feed shaft load detected by the feed axis load detecting unit with time. Unit 32, Y-axis load memory unit 33, Z-axis load memory unit 3
5 is provided, based on the feed shaft load stored and stored in the feed shaft load memory unit over time and the determination result stored and stored in the cutting state memory unit.
A feed shaft load information display output unit such as a display 5 for displaying and outputting feed shaft load information at the time of cutting feed such as the line graphs LG2 to LG4 over time and a display calculation unit 13 is provided. Therefore, the feed shaft load information displayed and output makes it easy to know the time-dependent information on what load the feed shaft motor operated during cutting feed, that is, what percentage of its capacity was exerted. Therefore, in addition to the effect of the first invention, the machining program is modified based on the feed shaft load information by increasing the feed speed involving the feed shaft motor with respect to the cutting during the inefficient cutting period. It becomes easy to change. Also, the feed axis load information output and displayed is the information at the time of cutting feed based on the above determination result. Therefore, a load that temporarily shows an extreme value due to, for example, rapid feed positioning involving the feed axis motor is excluded. Information, that is, accurate information on the load at the time of cutting. As a result, it is convenient to correct and change the machining program.

According to a third aspect of the present invention, in the machining load information detecting device according to the first aspect, the first load stored in the first load memory unit over time and the cutting state memory are stored. Load average value SFP of the first load at the time of cutting feed based on the determination result stored and stored in the section.
a first load average value calculating unit such as an average value detecting unit 11 that calculates a first load time average value such as b and outputs the calculated first load time average value to the first load information display unit; First
The load information display output unit is configured to display and output the first load time average value output from the first load average value calculation unit together with the first load information. Therefore, in addition to the effect of the first invention, since the first load time average is displayed and output, it is possible to easily grasp information on the average load at which the first motor operated during the cutting feed. It is convenient because it can be done.

According to a fourth aspect of the present invention, in the machining load information detecting device according to the second aspect, a feed axis load stored and stored in the feed axis load memory unit over time;
Based on the determination result stored in the cutting state memory unit, the load average value XF of the feed shaft load at the time of cutting feed.
A feed axis load average value calculation unit such as an average value detection unit 11 that calculates the feed axis load time average value of Pb, YFPb, ZFPb, etc., and outputs the calculated feed axis load time average value to the feed axis load information display unit. The feed shaft load information display output unit is configured to display and output the feed shaft load time average value output from the feed shaft load average value calculation unit together with the feed shaft load information. Therefore, in addition to the effect of the second invention, the feed axis load time average is displayed and output.
This is convenient because information about the average load of the feed shaft motor operated during cutting feed can be easily grasped.

According to a fifth aspect of the present invention, in the machining load information detecting apparatus according to the first aspect, the machining program has a command for designating a tool to be used, and The execution period of the cutting feed command to be executed when the predetermined machining is performed is determined by the read machining program together with the tool to be used, and a predetermined determination result is output. Therefore, in addition to the effect of the first invention, the load on the first motor generated for each tool used, that is, the load generated on the It is possible to easily grasp the degree of the load. Therefore, when modifying and changing the machining program by increasing the numerical values such as the feed speed and the peripheral speed of the spindle in inefficient cutting, the level of the load applied to the tool to be used is referred to, It is also possible to achieve higher machining efficiency by increasing numerical values such as the feed speed and the peripheral speed of the spindle within the range of the tolerance, or by replacing the tool with a higher-performance tool.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a machine tool provided with an example of a processing load information detecting device according to the present invention.

FIG. 2 is a schematic perspective view showing the vicinity of a main shaft of the machine tool shown in FIG.

FIG. 3 is a diagram conceptually showing a cutting state management table in a processing information memory unit.

FIG. 4 is a diagram conceptually showing the inside of a spindle load memory unit.

FIG. 5 is a diagram illustrating a first image displayed on a display;

FIG. 6 is a diagram conceptually showing the inside of a Z-axis load memory unit.

FIG. 7 is a diagram illustrating a second image displayed on a display;

FIG. 8 is a diagram conceptually showing the inside of an X-axis load memory unit.

FIG. 9 is a diagram illustrating a third image displayed on a display;

FIG. 10 is a diagram conceptually showing the inside of a Y-axis load memory unit.

FIG. 11 is a diagram illustrating a fourth image displayed on a display;

FIG. 12 is a diagram showing a fifth image displayed on a display.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Processing load information detection apparatus 5 ... 1st load information display output part, feed axis load information display output part (display) 6 ... Processing program memory part 10 ... Cutting state determination part (processing information detection part) 11 ... First load average value calculation section, feed axis load average value calculation section (average value detection section) 12... Cutting state memory section (machining information memory section) 13... First load information display output section, feed axis load Information display output section (display calculation section) 16 first load detection section (spindle load value detection section) 17 feed axis load detection section (X-axis load value detection section) 19 feed axis load detection section (Y Axial load value detecting section) 20: Feed axis load detecting section (Z-axis load value detecting section) 21: First load detecting section (spindle load calculating section) 22: Feed shaft load detecting section (X-axis load calculating section) ) 23: Feed axis load detector (Y-axis load calculator) 25: Feed Load detecting unit (Z-axis load calculating unit) 31 First load memory unit (spindle load memory unit) 32 Feed axis load memory unit (X-axis load memory unit) 33 Feed axis load memory unit (Y-axis) Load memory section) 35 Feed axis load memory section (Z-axis load memory section) 40 Tool spindle (spindle) 40a Tool 41 First motor (spindle motor) 45 Feed axis motor (Z Shaft feed shaft motor) 46 ... Feed shaft motor (X-axis feed shaft motor) 47 ... Feed shaft motor (Y-axis feed shaft motor) 55 ... Work mounting part (table) 60 ... Work 100 ... Machine tool HS ... determination result LG1 ... first load information (line graph) LG2 to LG4 ... feed axis load information (line graph) PRO ... machining program SFP ... first load (spindle load) SFPb ... first Average load time Load average value) TM1 to TM3 ... Execution period (cutting period) XFP ... Feed shaft load (X-axis load) YFP ... Feed shaft load (Y-axis load) ZFP ... Feed shaft load (Z-axis load) XFPb ... ... average feed axis load time (average load) YFPb ... average feed axis load time (average load) ZFPb ... average feed axis load time (average load)

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Yoshinori Yamaoka 1st boarding, Oguchi-machi, Oguchi-cho, Niwa-gun, Aichi Prefecture Inside Yamazaki Mazak Co., Ltd.

Claims (5)

[Claims] 1. A tool mounting portion on which a tool can be detachably mounted, a work mounting portion on which a work can be mounted is provided, and a first motor for rotating and driving the tool spindle is provided. A machining program memory unit for storing a machining program having an operation instruction; a machine tool for reading the machining program stored in the machining program memory unit and performing predetermined machining on a workpiece based on the machining program; , A first load detection unit that detects a first load based on a load current value of the first motor, and stores and stores the first load detected by the first load detection unit with time A first load memory unit is provided, and the execution period of a cutting feed command to be executed at the time of performing the predetermined machining is determined and detected based on the read machining program. A cutting state determination unit that outputs a determination result; a cutting state memory unit that stores a determination result output from the cutting state determination unit; and a first state stored and stored in the first load memory unit over time. And a first load information display output unit for displaying and outputting the first load information at the time of cutting feed in a time-dependent manner based on the load of and the determination result stored in the cutting state memory unit. Processing load information detection device. 2. The machine tool according to claim 1, further comprising a feed shaft motor configured to move the tool spindle relative to the workpiece mounting portion in a predetermined coordinate axis direction. A feed shaft load memory unit that has a feed shaft load detection unit that detects a feed shaft load based on a load current value of a feed shaft motor, and stores and stores the feed shaft load detected by the feed shaft load detection unit over time. Based on the feed shaft load stored and stored in the feed shaft load memory unit over time, and based on the determination result stored in the cutting state memory unit, feed shaft load information at the time of cutting feed is stored over time. 2. The machining load information detecting device according to claim 1, further comprising a feed shaft load information display output unit for displaying and outputting the information in a form. 3. A first load during cutting feed based on a first load stored and stored in the first load memory unit over time and a determination result stored in the cutting state memory unit.
Calculating a first load time average of the load and outputting the calculated first load time average to the first load information display unit.
A first load information display output unit configured to display and output the first load time average value output from the first load average value calculation unit together with the first load information; 2. The processing load information detecting device according to claim 1, wherein: 4. A feed shaft of a feed shaft load during cutting feed based on a feed shaft load stored and stored in the feed shaft load memory unit over time and a judgment result stored and stored in the cutting state memory unit. A feed axis load average value calculation unit that calculates a load time average value and outputs the calculated feed axis load time average value to the feed axis load information display unit is provided, and the feed axis load information display output unit includes the feed axis. 3. The processing load information detecting device according to claim 2, wherein the feed axis load time average output from the load average value calculator is displayed and output together with the feed axis load information. 5. The machining program has a command for designating a tool to be used, and the cutting state determination unit determines a cutting feed to be executed when the predetermined machining is performed, based on the read machining program. 2. The processing load information detecting device according to claim 1, wherein the execution period of the command is determined and detected together with the tool to be used, and a predetermined determination result is output.