CN110193753A - Creeping of Machining Tools monitoring method based on built-in encoder signal - Google Patents
Creeping of Machining Tools monitoring method based on built-in encoder signal Download PDFInfo
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- CN110193753A CN110193753A CN201910549646.8A CN201910549646A CN110193753A CN 110193753 A CN110193753 A CN 110193753A CN 201910549646 A CN201910549646 A CN 201910549646A CN 110193753 A CN110193753 A CN 110193753A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q17/00—Arrangements for observing, indicating or measuring on machine tools
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- Mechanical Engineering (AREA)
- Numerical Control (AREA)
- Machine Tool Sensing Apparatuses (AREA)
Abstract
Creeping of Machining Tools monitoring method based on built-in encoder signal, the digital control system communications protocol or external numbered card that first pass through lathe obtain the real-time position signal of encoder, then first differential is carried out to position signal and obtains instantaneous velocity signal, and then calculate index of creeping, the severity whether feed motion of lathe creeps and creep finally is judged based on index value size of creeping, the present invention takes full advantage of the built-in heat transfer agent of lathe, by the real-time analysis processing to code device signal, perception and the self diagnosis certainly to Creeping of Machining Tools are realized.
Description
Technical field
The present invention relates to the Creeping of Machining Tools monitoring methods based on built-in encoder signal, belong to machine tool field.
Background technique
Creeping of Machining Tools is the feed speed non-uniform phenomenon that lathe occurs under low speed feeding, and lathe can be seriously affected by creeping
Precision, geometric tolerance and the surface quality of processing, can also accelerate the abrasion of machine tool motion component, reduce the service life.Patent Shen
Please number for 201510640187.6 and 201510980485.X a patent propose respectively inhibit Creeping of Machining Tools device and mould
Type, but different establish a capital using the method in these patents of lathe inhibits to creep, and creeps and be difficult to be completely eliminated, it is low
Speed creeps and is still generally existing in most of lathes.
Real-time monitoring is carried out to Creeping of Machining Tools phenomenon and has been conducive to the operation conditions that lathe user understands lathe, it is existing creeping
As the early stage progress early warning of generation, to avoid the processing under the state of creeping.The monitoring of Creeping of Machining Tools is generally by external
Laser interferometer measurement operating position signal, and then the case where feed speed fluctuates is obtained to determine whether creeping, but
Laser interferometer can not generally use in process, and use cost is very high.
Summary of the invention
The purpose of the present invention is to provide the Creeping of Machining Tools monitoring methods based on built-in encoder signal, utilize the volume of lathe
Code device obtains the high-resolution position signal of feed motion, is estimated by instantaneous velocity and index of creeping calculates, to machine tool feed mistake
Whether journey creeps and degree carries out accurate judgement.
In order to achieve the above object, the technical scheme adopted by the invention is as follows:
Creeping of Machining Tools monitoring method based on built-in encoder signal, comprising the following steps:
Step 1 obtains the real-time position signal of encoder, note by the digital control system communications protocol of lathe or external numbered card
For x (n).
The sample frequency of signal should be greater than creeping 2 times of frequency, and since frequency of creeping is generally unknown, sample frequency is settable
For a reasonable the larger value (recommended value: 2000Hz).
Step 2 carries out first differential to position signal x (n), instantaneous velocity signal s (n) is calculated.
S (n)=(x (n)-x (n-1))/△ t, wherein △ t is sampling time interval.
Index S SI (Stick-slip Index) is creeped in step 3, calculating.
SSI=(smax-smin)/smean, wherein smax, sminAnd smeanIt is the maximum value of s (n), minimum value and average respectively
Value.
Step 4 judges the severity whether feed motion of lathe creeps and creep.Judgment basis: SSI
< 1, nothing are creeped；SSI >=1 is creeped, and SSI value is bigger, illustrates that the degree of creeping is more serious.
The invention has the following advantages:
A) resolution ratio of encoder is generally at least higher by machine tool accuracy an order of magnitude, and high-resolution characteristic believes encoder
Number it can effectively reflect caused velocity perturbation of creeping.
B) whether the method for the present invention can automatically occur Creeping of Machining Tools and degree carries out accurate judgement, without artificial behaviour
Make.
C) encoder is the built-in sensors of lathe, does not increase testing cost, is conducive to the popularization of the method for the present invention and answers
With realization lathe is to perception and the self diagnosis certainly creeped.
Detailed description of the invention
Fig. 1 is that the embodiment of the present invention tests schematic diagram.
Fig. 2 is the flow chart of the method for the present invention.
Fig. 3 is code device signal x of the embodiment of the present invention (n).
Fig. 4 is instantaneous velocity signal s of the embodiment of the present invention (n).
Fig. 5 is creep index S SI of the lathe of the embodiment of the present invention under different feed speeds.
Specific embodiment
The present invention will be described in detail with reference to the accompanying drawings and examples.
By taking the Y-axis to certain Five-axis NC Machining Center crawls monitoring as an example, Y-axis is by servo motor 1, shaft coupling 2, work
Platform 3, lead screw 4 form, as shown in Figure 1, servo motor 1 drives lead screw 4 to rotate by shaft coupling 2, convert work for rotary motion
Make platform 3 along the horizontal movement of Y-axis.Linear encoder 6 is installed along the y axis, is obtained by 5 decodable code of numbered card of connection
The real-time position signal of workbench 3.
Design parameter is as follows: 1) lead screw 4 is single head lead screw, lead 16mm；2) the output signal format of linear grating ruler is
1Vpp, physical resolution 0.02mm；3) numbered card can 4096 times of carry out of subdivision to adjacent gratings groove；4) sampling frequency
Rate is 2000Hz, is sampled duration 1 second；2) feed speed of Y-axis is respectively 5mm/min.
Processing analysis is carried out to Y-axis code device signal using the present invention, and whether the axis feed motion is occurred in the process
It creeps and the degree of creeping is judged.
As shown in Fig. 2, the Creeping of Machining Tools monitoring method based on built-in encoder signal, comprising the following steps:
Step 1 obtains the real-time position signal of encoder, note by the digital control system communications protocol of lathe or external numbered card
For x (n), as shown in Figure 3.
Step 2 carries out first differential to position signal x (n), instantaneous velocity signal s (n) is calculated, as shown in Figure 4.
S (n)=(x (n)-x (n-1))/△ t, wherein △ t is sampling time interval.
Index S SI (Stick-slip Index) is creeped in step 3, calculating
SSI=(smax-smin)/smean=(13.08-0.49)/5.01=2.51, wherein smax, sminAnd smeanIt is s (n) respectively
Maximum value, minimum value and average value.
Step 4 judges the severity whether feed motion of lathe creeps and creep.The value of SSI is
2.51, it is much larger than 1, illustrates that serious creep has occurred in lathe Y-axis under the feed speed of 5mm/min.
Judgment basis: SSI < 1, nothing are creeped；SSI >=1 is creeped, and SSI value is bigger, illustrates that the degree of creeping is more serious.
Code device signal of the Y-axis under 20mm/min and 80mm/min feed speed is analyzed, index of creeping is obtained
Value is as shown in Figure 5, it is seen that with the raising of feed speed, index S of creeping SI (is equal to 20mm/min in feed speed in reduction
When, SSI=1.07；Feed speed reaches 80mm/min, SSI=0.15), meet the rule of creeping phenomenon.
Creeping of Machining Tools monitoring method proposed by the present invention based on built-in encoder signal, takes full advantage of the built-in of lathe
Heat transfer agent is handled by the real-time analysis to code device signal, realizes perception and self diagnosis certainly to Creeping of Machining Tools.
Claims (1)
1. the Creeping of Machining Tools monitoring method based on built-in encoder signal, which comprises the following steps: step 1 is led to
The digital control system communications protocol or external numbered card of crossing lathe obtain the real-time position signal of encoder, are denoted as x (n).Signal
Sample frequency should be greater than creeping 2 times of frequency, since frequency of creeping is generally unknown, sample frequency may be configured as one reasonably compared with
Big value (recommended value: 2000Hz).Step 2 carries out first differential to position signal x (n), instantaneous velocity signal s is calculated
(n).S (n)=(x (n)-x (n-1))/△ t, wherein △ t is sampling time interval.Step 3 calculates the index S SI that creeps
(Stick-slip Index).SSI=(smax-smin)/smean, wherein smax, sminAnd smeanIt is the maximum value, most of s (n) respectively
Small value and average value.Step 4 judges the severity whether feed motion of lathe creeps and creep.Judge according to
According to: SSI < 1, nothing are creeped；SSI >=1 is creeped, and SSI value is bigger, illustrates that the degree of creeping is more serious.
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|---|---|---|---|
| CN201910549646.8A CN110193753A (en) | 2019-06-24 | 2019-06-24 | Creeping of Machining Tools monitoring method based on built-in encoder signal |
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| CN201910549646.8A CN110193753A (en) | 2019-06-24 | 2019-06-24 | Creeping of Machining Tools monitoring method based on built-in encoder signal |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU868457A1 (en) * | 1980-01-31 | 1981-09-30 | Предприятие П/Я Г-4614 | Running machine for durability testing of machines |
| CN2043906U (en) * | 1988-12-27 | 1989-09-06 | 大连理工大学 | Automatic apparatus of analyzing and processing for homogeneous degree of machine tool motion |
| CN102095574A (en) * | 2010-11-26 | 2011-06-15 | 南京理工大学 | Joint surface dynamic characteristic parameter testing device of rolling guide rail and testing method thereof |
| CN102346097A (en) * | 2011-04-18 | 2012-02-08 | 兰州理工大学 | Overall performance test experimental platform for high-speed ball screw feeding system |
| JP2013526724A (en) * | 2010-05-25 | 2013-06-24 | シーメンス エナジー インコーポレイテッド | Machine vibration monitoring |
-
2019
- 2019-06-24 CN CN201910549646.8A patent/CN110193753A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU868457A1 (en) * | 1980-01-31 | 1981-09-30 | Предприятие П/Я Г-4614 | Running machine for durability testing of machines |
| CN2043906U (en) * | 1988-12-27 | 1989-09-06 | 大连理工大学 | Automatic apparatus of analyzing and processing for homogeneous degree of machine tool motion |
| JP2013526724A (en) * | 2010-05-25 | 2013-06-24 | シーメンス エナジー インコーポレイテッド | Machine vibration monitoring |
| CN102095574A (en) * | 2010-11-26 | 2011-06-15 | 南京理工大学 | Joint surface dynamic characteristic parameter testing device of rolling guide rail and testing method thereof |
| CN102346097A (en) * | 2011-04-18 | 2012-02-08 | 兰州理工大学 | Overall performance test experimental platform for high-speed ball screw feeding system |
Non-Patent Citations (1)
| Title |
|---|
| 管仁伟: "直线运动不均匀度的计算机辅助测试", 《磨床与磨削》 * |
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