CN109765844A - A kind of numerically-controlled machine tool temperature error compensation evaluation method and device - Google Patents
A kind of numerically-controlled machine tool temperature error compensation evaluation method and device Download PDFInfo
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Abstract
The present invention provides a kind of numerically-controlled machine tool temperature error compensation evaluation method and device, this method comprises: obtaining accumulation amount of movement of the corresponding object tables of target axis within (n+1)th period, n is positive integer；The accumulation calorific capacity in (n+1)th period is determined according to the accumulation amount of movement；Current deformation error is determined with the deformation error coefficient demarcated in advance according to the accumulation calorific capacity；The second position of object tables when based on the current first position of the object tables and demarcating the deformation error coefficient, carries out positional error compensation to the current deformation error, obtains the error amount for carrying out temperature error compensation.The embodiment of the present invention reduces the cost of numerically-controlled machine tool.
Description
Technical field
The present invention relates to field of communication technology more particularly to a kind of numerically-controlled machine tool temperature error compensation evaluation methods and dress
It sets.
Background technique
It is well known that the temperature compensation algorithm of numerical control (Computerized Numerical Control, CNC) lathe,
The always problem of manufacturing industry raising machining accuracy.This is because environment temperature or the heat of processing accumulation may cause lathe
Each section expansion.Range of expansion depends on temperature, the thermal conductivity etc. of each lathe part.Different temperatures may cause the reality of each axis
Position changes, this can have a negative impact to the workpiece accuracy in processing.The variation of these actual values can be mended by temperature
Counteracting is repaid, and in order to correctly compensate heat expansion bring error always.The temperature value of sensor detection is generallyd use in the prior art,
And the temperature value based on detection quickly calculates error amount, to carry out temperature error compensation to numerically-controlled machine tool.Need to be mounted so that
Temperature sensor, so that the higher cost of numerically-controlled machine tool.
Summary of the invention
The embodiment of the present invention provides a kind of numerically-controlled machine tool temperature error compensation evaluation method and device, to solve installation temperature
The problem of sensor carries out temperature error compensation, leads to the higher cost of numerically-controlled machine tool.
In order to solve the above-mentioned technical problem, the present invention is implemented as follows:
In a first aspect, the embodiment of the invention provides a kind of numerically-controlled machine tool temperature error compensation evaluation methods, comprising:
Accumulation amount of movement of the corresponding object tables of target axis within (n+1)th period is obtained, n is positive integer；
The accumulation calorific capacity in (n+1)th period is determined according to the accumulation amount of movement；
Current deformation error is determined with the deformation error coefficient demarcated in advance according to the accumulation calorific capacity；
Target work when based on the current first position of the object tables and demarcating the deformation error coefficient
The second position for making platform carries out positional error compensation to the current deformation error, obtains for carrying out temperature error compensation
Error amount.
Optionally, the first position current based on the object tables and demarcate the deformation error coefficient when
The second position of the object tables carries out positional error compensation to the current deformation error, obtains for carrying out temperature
Degree error compensation error amount include:
According to Δ Hx=Δ T*Lx/L0Calculate the error amount Δ Hx；Wherein, Δ T indicates the current deformation error, Lx
Indicate the first position to the target axis the distance between fixed point；L0Indicate the second position to the target axis
The distance between fixed point.
Optionally, described to determine that the accumulation calorific capacity in (n+1)th period includes: according to the accumulation amount of movement
According to Cn+1=(Cn+M)*exp(-T/t)Calculate the accumulation calorific capacity C in (n+1)th periodn+1, wherein CnTable
Show the accumulation calorific capacity in n-th of period, T indicates the duration in period, and t indicates heat release duration.
Optionally, described to determine that current deformation misses with the deformation error coefficient demarcated in advance according to the accumulation calorific capacity
Difference includes:
According to Δ T=Cn+1* K calculates the current deformation error delta T, wherein Cn+1Indicate tired in (n+1)th period
Product calorific capacity, K indicate the deformation error coefficient.
Second aspect, the embodiment of the invention also provides a kind of numerically-controlled machine tool temperature error compensations to estimate device, comprising:
Module is obtained, for obtaining accumulation amount of movement of the corresponding object tables of target axis within (n+1)th period, n
For positive integer；
First computing module, for determining the accumulation calorific capacity in (n+1)th period according to the accumulation amount of movement；
Second computing module, for being determined currently according to the accumulation calorific capacity with the deformation error coefficient demarcated in advance
Deformation error；
Processing module, for based on the current first position of the object tables and the calibration deformation error coefficient
The second position of Shi Suoshu object tables carries out positional error compensation to the current deformation error, obtains for carrying out
The error amount of temperature error compensation.
Optionally, the processing module is specifically used for: according to Δ Hx=Δ T*Lx/L0Calculate the error amount Δ Hx；Its
In, Δ T indicates the current deformation error, LxIndicate the first position between the fixed point of the target axis away from
From；L0Indicate the second position to the target axis the distance between fixed point.
Optionally, first computing module is specifically used for: according to Cn+1=(Cn+M)*exp(-T/t)Calculate described (n+1)th
Accumulation calorific capacity C in a periodn+1, wherein CnIndicate the accumulation calorific capacity in n-th of period, T indicates the duration in period, t
Indicate heat release duration.
Optionally, second computing module is specifically used for: according to Δ T=Cn+1* K calculates the current deformation error
Δ T, wherein Cn+1Indicate the accumulation calorific capacity in (n+1)th period, K indicates the deformation error coefficient.
The third aspect, the embodiment of the invention also provides a kind of computer readable storage mediums, are stored thereon with computer
The step of program, the computer program realizes above-mentioned numerically-controlled machine tool temperature error compensation evaluation method when being executed by processor.
The embodiment of the present invention is mobile by obtaining accumulation of the corresponding object tables of target axis within (n+1)th period
Amount, n is positive integer；The accumulation calorific capacity in (n+1)th period is determined according to the accumulation amount of movement；It is generated heat according to the accumulation
Value and the deformation error coefficient demarcated in advance determine current deformation error；Based on the current first position of the object tables
And when demarcating the deformation error coefficient, the second position of the object tables carries out position to the current deformation error
Error compensation is set, the error amount for carrying out temperature error compensation is obtained.In this way, compared with the existing technology without temperature biography
Sensor collecting temperature value, therefore the embodiment of the present invention reduces the cost of numerically-controlled machine tool.Further, since without installing sensor,
The assembly difficulty of numerically-controlled machine tool can be reduced.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, needed in being described below to the embodiment of the present invention
Attached drawing to be used is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention,
For those of ordinary skill in the art, without any creative labor, it can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the flow chart of numerically-controlled machine tool temperature error compensation evaluation method provided in an embodiment of the present invention；
Fig. 2 is target axis in numerically-controlled machine tool in numerically-controlled machine tool temperature error compensation evaluation method provided in an embodiment of the present invention
With the attachment structure schematic diagram of object tables；
Fig. 3 is the deformation error of target axis in numerically-controlled machine tool temperature error compensation evaluation method provided in an embodiment of the present invention
Curve；
Fig. 4 is the structure chart for the numerically-controlled machine tool temperature error compensation estimation device that one embodiment of the invention provides.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
It is a kind of process of numerically-controlled machine tool temperature error compensation evaluation method provided in an embodiment of the present invention referring to Fig. 1, Fig. 1
Figure, as shown in Figure 1, comprising the following steps:
Step 101 obtains accumulation amount of movement of the corresponding object tables of target axis within (n+1)th period, and n is positive whole
Number；
Numerically-controlled machine tool temperature error compensation evaluation method provided in an embodiment of the present invention is mainly used in numerically-controlled machine tool, number
Transportable axis may include X-axis, Y-axis and Z axis on control lathe, and above-mentioned target axis is any axis in numerically-controlled machine tool, can be with
The numerically-controlled machine tool temperature error compensation evaluation method provided through the invention carries out error to any one axis in numerically-controlled machine tool
Compensation.In following embodiment, it is described in detail so that target axis is X-axis as an example.
As shown in Fig. 2, above-mentioned target axis is screw rod 201, above-mentioned object tables 202 are arranged by sliding block 203 in screw rod
It can be moved left and right along screw rod 201 on 201.It include two object tables 202 in Fig. 2, on screw rod 201 for indicating target
Workbench 202 is located at the state of different positions, not needs that two object tables are arranged on screw rod 201 when practical application
202.Specifically, one end of above-mentioned screw rod 201 is for being connected to motor, the other end is free state.
In the embodiment of the present invention, the mobile distance of object tables can be recorded in real time, and accumulate the absolute of moving distance
Value, adds up into integrator, the final accumulation amount of movement arrived in each period.It is first such as within (n+1)th period
First to the mobile 100mm of the forward direction of X-axis, then to the mobile 20mm of the negative direction of X-axis, then to the mobile 50mm of the positive direction of X-axis, finally
To the mobile 80mm of the negative direction of X-axis, then the accumulation amount of movement in above-mentioned (n+1)th period is 250mm.
It should be noted that the time for obtaining the accumulation amount of movement in above-mentioned (n+1)th period can be according to actual needs
It is configured, the accumulation amount of movement when each period end time reaches, in the available corresponding period.That is, can
To obtain the accumulation amount of movement in a period every preset duration, the preset duration is consistent with the time span in period, and opens
When the time that beginning obtains is the 1st end cycle.Certainly in other embodiments, can also be obtained using other time points
It takes and compensates, it is not further to this to be limited.In the present embodiment, the time span in above-mentioned period can be according to practical need
It is configured, for example, can be 6~10ms.That is, every 6~10ms object tables of acquisition upper one
Accumulation amount of movement in period, and carry out the adjustment of a deformation error.
Step 102 determines the accumulation calorific capacity in (n+1)th period according to the accumulation amount of movement；
In the embodiment of the present invention, the calculation of the accumulation calorific capacity in (n+1)th period can according to actual needs into
Row setting, such as in the present embodiment, it can be according to Cn+1=(Cn+M)*exp(-T/t)Calculate the accumulation in (n+1)th period
Calorific capacity Cn+1, wherein CnIndicate the accumulation calorific capacity in n-th of period, T indicates the duration in period, and t indicates heat release duration.
Above-mentioned heat release duration refers to that temperature raising causes largest deformation error, is reduced to largest deformation error to deformation error
The value of preset percentage duration experienced, the preset percentage can be configured according to actual needs, in the present embodiment,
The preset percentage is 37%, determines that the deformation of target axis tends to static balance state at this time.
Step 103 determines current deformation error with the deformation error coefficient demarcated in advance according to the accumulation calorific capacity；
In the embodiment of the present invention, the calculation of above-mentioned current deformation error can be configured according to actual needs,
It, can be according to Δ T=C such as in the present embodimentn+1* K calculates the current deformation error delta T, wherein Cn+1Indicate (n+1)th
Accumulation calorific capacity in a period, K indicate the deformation error coefficient.
Wherein, above-mentioned deformation error coefficient is calibration in advance, such as before numerically-controlled machine tool factory, or is pacified in numerically-controlled machine tool
After dress, user can the deformation error coefficient to numerically-controlled machine tool demarcate.Specifically, the process of calibration is in the examples below
It is described in detail.
Step 104, based on the current first position of the object tables and demarcate the deformation error coefficient when, institute
The second position for stating object tables carries out positional error compensation to the current deformation error, obtains for carrying out temperature
The error amount of error compensation.
In the embodiment of the present invention, the calculation of above-mentioned error amount can be configured according to actual needs, such as at this
It, can be according to Δ H in embodimentx=Δ T*Lx/L0Calculate the error amount Δ Hx；Wherein, Δ T indicates the current deformation
Error, LxIndicate the first position to the target axis the distance between fixed point；L0Indicate the second position described in
The distance between the fixed point of target axis.
As shown in Fig. 2, one end of above-mentioned target axis is mounted on fixed block, and it is connected to motor, the other end is free end,
Target axis is formed with fixed point at fixed block.In Fig. 2, when object tables are located at first position, the first position with
The distance between fixed point LxFor 100mm；When object tables are located at the second position, between the second position and fixed point
Distance L0For 950mm.Above-mentioned first position is the mobile target of current time ((n+1)th end cycle moment) object tables
Position.
When above-mentioned current deformation error refers to the second position locating for calibration deformation error coefficient object tables,
The corresponding deformation error generated under Current Temperatures, i.e., above-mentioned deformation error are the deformation error of the second position under Current Temperatures.
Based on the deformation error, above-mentioned formula Δ H is utilizedx=Δ T*Lx/L0Corresponding error amount under first position can be calculated.
The embodiment of the present invention is mobile by obtaining accumulation of the corresponding object tables of target axis within (n+1)th period
Amount, n is positive integer；The accumulation calorific capacity in (n+1)th period is determined according to the accumulation amount of movement；It is generated heat according to the accumulation
Value and the deformation error coefficient demarcated in advance determine current deformation error；Based on the current first position of the object tables
And when demarcating the deformation error coefficient, the second position of the object tables carries out position to the current deformation error
Error compensation is set, the error amount for carrying out temperature error compensation is obtained.In this way, compared with the existing technology without temperature biography
Sensor collecting temperature value, therefore the embodiment of the present invention reduces the cost of numerically-controlled machine tool.Further, since without installing sensor,
The assembly difficulty of numerically-controlled machine tool can be reduced.
In order to better understand the present invention, deformation error coefficient is demarcated and is tested below above-mentioned heat release duration
Process is described in detail.
Specifically, temperature sensor is arranged on target axis first, and object tables are moved to test origin (on i.e.
State the second position)；Then control object tables high speed rapid traverse back and forth on target axis, so that the temperature of target axis increases.?
In mobile process, every preset duration (can be consistent with the duration in above-mentioned period), object tables will be moved to test
Origin, and the temperature value that acquisition temperature sensor detects when each preset duration reaches, it is mobile according to control object tables
Program determine the distance moved in each preset duration.It, will after temperature raising causes largest deformation error (such as 50um)
No longer control object tables are mobile, target axis by static cooling, record at regular intervals object tables to fixed point it
Between distance, the shape of target axis can be calculated to the distance between fixed point according to object tables of every time record
Become error, to obtain above-mentioned heat release duration.Specifically, as shown in figure 3, by above-mentioned percentage be 37% for, i.e. exp (-
1), when above-mentioned heat release under a length of stationary state target axis from largest deformation error 50um be reduced to 18.4um needed for the time it is long
Degree, in the present embodiment, when heat release, a length of 600ms can also be certainly in other embodiments other values, not another herein
One enumerates.
The temperature value of temperature sensor detection, each default when obtaining above-mentioned heat release duration, each preset duration reaching
It, can be according to above-mentioned formula 1:C after the distance moved in durationn+1=(Cn+M)*exp(-T/t)Calculate Cn；Finally, according to formula 2:
Δ T=Cn+1* K and formula 3: Δ Hx=Δ T*Lx/L0Derive COEFFICIENT K.
It should be noted that the embodiment for the plurality of optional introduced in the embodiment of the present invention, can be combined with each other each other
It realizes, can also be implemented separately, this embodiment of the present invention is not construed as limiting.
Referring to fig. 4, Fig. 4 is the structure chart of numerically-controlled machine tool temperature error compensation estimation device provided in an embodiment of the present invention,
As shown in figure 4, numerically-controlled machine tool temperature error compensation estimation device 400 includes:
Module 401 is obtained, it is mobile for obtaining accumulation of the corresponding object tables of target axis within (n+1)th period
Amount, n is positive integer；
First computing module 402, for determining the accumulation calorific capacity in (n+1)th period according to the accumulation amount of movement；
Second computing module 403, for being worked as according to the accumulation calorific capacity with the deformation error coefficient determination demarcated in advance
Preceding deformation error；
Processing module 404, for based on the current first position of the object tables and the calibration deformation error
The second position of object tables when coefficient carries out positional error compensation to the current deformation error, is used for
Carry out the error amount of temperature error compensation.
Optionally, the processing module 404 is specifically used for: according to Δ Hx=Δ T*Lx/L0Calculate the error amount Δ Hx；
Wherein, Δ T indicates the current deformation error, LxIndicate the first position between the fixed point of the target axis away from
From；L0Indicate the second position to the target axis the distance between fixed point.
Optionally, first computing module 402 is specifically used for: according to Cn+1=(Cn+M)*exp(-T/t)Calculate described n-th
Accumulation calorific capacity C in+1 periodn+1, wherein CnIndicating the accumulation calorific capacity in n-th of period, T indicates the duration in period,
T indicates heat release duration.
Optionally, second computing module 403 is specifically used for: according to Δ T=Cn+1* K calculates the current deformation and misses
Poor Δ T, wherein Cn+1Indicate the accumulation calorific capacity in (n+1)th period, K indicates the deformation error coefficient.
The method that numerically-controlled machine tool temperature error compensation estimation device provided in an embodiment of the present invention can be realized Fig. 1 to Fig. 3
Each process of embodiment, to avoid repeating, which is not described herein again.
The embodiment of the present invention also provides a kind of computer readable storage medium, and meter is stored on computer readable storage medium
Calculation machine program, the computer program realize above-mentioned numerically-controlled machine tool temperature error compensation evaluation method embodiment when being executed by processor
Each process, and identical technical effect can be reached, to avoid repeating, which is not described herein again.Wherein, the computer can
Storage medium is read, such as read-only memory (Read-Only Memory, abbreviation ROM), random access memory (Random
Access Memory, abbreviation RAM), magnetic or disk etc..
Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure
Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually
It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician
Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed
The scope of the present invention.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In embodiment provided herein, it should be understood that disclosed device and method can pass through others
Mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only
A kind of logical function partition, there may be another division manner in actual implementation, for example, multiple units or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or communication link of device or unit
It connects, can be electrical property, mechanical or other forms.
Technical solution of the present invention substantially the part that contributes to existing technology or the technical solution in other words
Part can be embodied in the form of software products, which is stored in a storage medium, if including
Dry instruction is used so that a computer equipment (can be personal computer, server or the network equipment etc.) executes this hair
The all or part of the steps of bright each embodiment the method.And storage medium above-mentioned include: USB flash disk, mobile hard disk, ROM,
The various media that can store program code such as RAM, magnetic or disk.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (9)
1. a kind of numerically-controlled machine tool temperature error compensation evaluation method characterized by comprising
Accumulation amount of movement of the corresponding object tables of target axis within (n+1)th period is obtained, n is positive integer；
The accumulation calorific capacity in (n+1)th period is determined according to the accumulation amount of movement；
Current deformation error is determined with the deformation error coefficient demarcated in advance according to the accumulation calorific capacity；
Object tables when based on the current first position of the object tables and demarcating the deformation error coefficient
The second position, positional error compensation is carried out to the current deformation error, obtains the mistake for carrying out temperature error compensation
Difference.
2. the method according to claim 1, wherein the first position current based on the object tables
And the second position of the object tables when deformation error coefficient is demarcated, position is carried out to the current deformation error
Set error compensation, obtain include: for the error amount for carrying out temperature error compensation
According to Δ Hx=Δ T*Lx/L0Calculate the error amount Δ Hx；Wherein, Δ T indicates the current deformation error, LxIt indicates
Fixed point the distance between of the first position to the target axis；L0Indicate the second position consolidating to the target axis
The distance between fixed point.
3. the method according to claim 1, wherein described determined for the (n+1)th week according to the accumulation amount of movement
Accumulation calorific capacity in phase includes:
According to Cn+1=(Cn+M)*exp(-T/t)Calculate the accumulation calorific capacity C in (n+1)th periodn+1, wherein CnIndicate n-th
Accumulation calorific capacity in a period, T indicate the duration in period, and t indicates heat release duration.
4. the method according to claim 1, wherein described according to the shape accumulating calorific capacity and demarcating in advance
Become error coefficient and determines that current deformation error includes:
According to Δ T=Cn+1* K calculates the current deformation error delta T, wherein Cn+1Indicate the accumulation hair in (n+1)th period
Calorific value, K indicate the deformation error coefficient.
5. a kind of numerically-controlled machine tool temperature error compensation estimates device characterized by comprising
Module is obtained, for obtaining accumulation amount of movement of the corresponding object tables of target axis within (n+1)th period, n is positive
Integer；
First computing module, for determining the accumulation calorific capacity in (n+1)th period according to the accumulation amount of movement；
Second computing module, for determining current deformation with the deformation error coefficient demarcated in advance according to the accumulation calorific capacity
Error；
Processing module, for based on the current first position of the object tables and the calibration deformation error coefficient when institute
The second position for stating object tables carries out positional error compensation to the current deformation error, obtains for carrying out temperature
The error amount of error compensation.
6. numerically-controlled machine tool temperature error compensation according to claim 5 estimates device, which is characterized in that the processing module
It is specifically used for: according to Δ Hx=Δ T*Lx/L0Calculate the error amount Δ Hx；Wherein, Δ T indicates the current deformation error,
LxIndicate the first position to the target axis the distance between fixed point；L0Indicate the second position to the target
The distance between fixed point of axis.
7. numerically-controlled machine tool temperature error compensation according to claim 5 estimates device, which is characterized in that described first calculates
Module is specifically used for: according to Cn+1=(Cn+M)*exp(-T/t)Calculate the accumulation calorific capacity C in (n+1)th periodn+1,
In, CnIndicate the accumulation calorific capacity in n-th of period, T indicates the duration in period, and t indicates heat release duration.
8. numerically-controlled machine tool temperature error compensation according to claim 5 estimates device, which is characterized in that described second calculates
Module is specifically used for: according to Δ T=Cn+1* K calculates the current deformation error delta T, wherein Cn+1Indicate (n+1)th period
Interior accumulation calorific capacity, K indicate the deformation error coefficient.
9. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the computer program quilt
The step of processor realizes numerically-controlled machine tool temperature error compensation evaluation method described in any one of Claims 1-4 when executing.
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| CN110161969B (en) * | 2019-06-26 | 2020-11-27 | 珠海格力智能装备有限公司 | Error compensation method and device |
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