CN106483928A - A kind of dry chain digital control gear hobbing machine bed radial heat distortion error of cutting is in machine real-time compensation method - Google Patents

A kind of dry chain digital control gear hobbing machine bed radial heat distortion error of cutting is in machine real-time compensation method Download PDF

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Publication number
CN106483928A
CN106483928A CN201710001859.8A CN201710001859A CN106483928A CN 106483928 A CN106483928 A CN 106483928A CN 201710001859 A CN201710001859 A CN 201710001859A CN 106483928 A CN106483928 A CN 106483928A
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gear
workpieces
dry
gear workpieces
digital control
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CN106483928B (en
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曹华军
李本杰
陈二恒
鄢佳豪
鞠文杰
杨潇
朱利斌
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Chongqing University
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/18—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form
    • G05B19/404—Numerical control [NC], i.e. automatically operating machines, in particular machine tools, e.g. in a manufacturing environment, so as to execute positioning, movement or co-ordinated operations by means of programme data in numerical form characterised by control arrangements for compensation, e.g. for backlash, overshoot, tool offset, tool wear, temperature, machine construction errors, load, inertia
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B2219/00—Program-control systems
    • G05B2219/30—Nc systems
    • G05B2219/35—Nc in input of data, input till input file format
    • G05B2219/35015—Calculate production compensation, heat shrinkage, overetching

Abstract

The present invention discloses a kind of dry chain digital control gear hobbing machine bed radial heat distortion error of cutting in machine real-time compensation method, it is characterized in that, using infrared temperature sensor and laser displacement sensor, on-line measurement has just processed temperature and the root circle size of gear workpieces respectively, and the compensation method considers the thermal expansion deformation of processed gear workpieces simultaneously and dry cuts the processed gear workpieces radial direction comprehensive process thermal deformation errors that chain digital control gear hobbing machine bed radial heat distortion causes；By setting up gear workpieces temperature and root circle size and the dry relational model that cuts between chain digital control gear hobbing machine bed radial heat distortion error, it is achieved that dry cut chain digital control gear hobbing machine bed radial heat distortion error in machine real-Time Compensation.

Description

A kind of dry chain digital control gear hobbing machine bed radial heat distortion error of cutting is in machine real-time compensation method
Technical field
The present invention relates to dry cut chain digital control gear hobbing machine bed processing technique field, more particularly to dry cut numerical control gear hobbing process during Compensation method in machine real-Time Compensation is carried out to dry chain digital control gear hobbing machine bed thermal deformation errors of cutting.
Background technology
In recent years, Dry-Cutting Technology has obtained the development that advances by leaps and bounds, and DRY CUTTING is eliminated in traditional working angles The use of cutting fluid, is a kind of sustainable cutting technology of typical environmental protection.But due to eliminating cutting fluid Use so that dry cut lathe thermal deformation be more serious in process, heat endurance is difficult to ensure that, causes workpiece to be machined Dimensional accuracy and dimensional uniformity are difficult to control to.
Dry lathe of cutting in the operation course of work, due to the operating of lathe each spindle motor, bearing and guide rail motion, machining Deng generating substantial amounts of heat in lathe, and the heat part that cutting region produces is with the mode quilt such as chip, cross-ventilation Take away, the heat of remainder is distributed in cutter, in workpiece to be machined and lathe.Heat is during generation and conduction Dry lathe internal temperature of cutting can be caused to gradually rise, so that dry machine tool element of cutting occurs different degrees of deformation, affect machine The operation machining accuracy of bed, the machining accuracy of lathe can be directly reflected in the precision of workpiece to be machined.
Existing thermal deformation of machine tool error compensating method mainly has two ways, one be using temperature sensor measurement lathe The relational model that temperature of key part is set up between thermal deformation of machine tool error and temperature；Two be using displacement sensor workpiece Change in size obtains thermal deformation of machine tool error indirectly.The lathe that is set up using temperature sensor measurement lathe temperature of key part Relational model between thermal deformation errors and temperature has certain practicality, but as lathe material uniformity is difficult to ensure that, The each position thermal deformation degree of machine tool element is different, and lathe is often in idle condition, the temperature of lathe key components and parts Changing Pattern is difficult to control, and causes the relation mould that accurately can not be set up between lathe temperature of key part and thermal deformation of machine tool error Type；It is the characteristic size by off-line measurement workpiece to be machined mostly using displacement sensor, indirect gain lathe heat becomes Shape error, be because conventional wet cut during mist of oil can disturb the measurement of laser displacement sensor, but as off-line measurement is added Work gear workpiece features size (such as common normal, root circle etc.) is time-consuming and can produce manual measurement error is difficult to ensure that precision, Simultaneously because do not account for the distortion inaccuracy of workpiece to be machined expanded by heating, therefore thermal deformation of machine tool error measure and compensation precision Not high, the precision of workpiece to be machined is difficult to ensure that.Dry lathe of cutting eliminates dependence of the traditional machine tool to cutting fluid, it is achieved that clear Clean, environmental protection, green processing are thermal deformation errors proposed by the present invention to be provided in machine real-Time Compensation and realizes condition.
Content of the invention
It is an object of the invention to provide a kind of dry chain digital control gear hobbing machine bed radial heat distortion error of cutting is in machine real-time compensation method, The compensation method is used for solving dry cutting the workpiece size precision that thermal deformation of machine tool during chain digital control gear hobbing machine bed Rolling-cut shear causes And the problem of dimensional uniformity, to ensure dry to cut chain digital control gear hobbing machine bed hobbing processing technology performance.
The technical scheme adopted for realizing the object of the invention is such, and a kind of dry chain digital control gear hobbing machine bed radial direction heat of cutting becomes Shape error is in machine real-time compensation method, it is characterised in that including following part：
1) setting measurement process
1.1) prototype gear root radius
Using laser displacement sensor, the radial direction wheel of the gear workpieces just processed for m-th by triangulation measurement Wide radius, m are the serial number of the dry gear workpieces for cutting the processing of chain digital control gear hobbing machine bed.
The launch window (101) of the laser displacement sensor is with the rotation axis of gear workpieces at a distance of L.The laser position The transmitting light beam of displacement sensor is perpendicularly oriented to the rotation axis of gear workpieces.
The gear workpieces number of teeth is z, and gear workpieces are rotated with rotating speed n (r/min) on the table, and laser displacement is sensed The sample frequency of device is f (secondary/s), and sampling workpiece rotating cycle is T, then laser displacement sensor total number of sample points is N：
The immediate data of laser displacement sensor measurement is launch window (101) and the gear workpieces of laser displacement sensor The distance of profileI-th radial contour radius that m-th gear workpieces can then be calculated be：
It is calculated all radial contour radius data collection of m-th gear workpieces R is pressed Time order and function order is divided into p=T × z interval, then each interval includesIndividual radial contour radius data, takes each interval In minimum of a value, formed data set
After the singular value point removed in S by clustering algorithm, mean value is tried to achieveThe mean valueAs m-th tooth The root radius measured value of wheel workpiece.
1.2) gear radial heat distortion error is obtained
Temperature T of m-th gear workpieces just processed using infrared temperature sensor measurementm.
The thermalexpansioncoefficientα of gear is determined according to gear workpieces material, and gear workpieces radial temperature profile is thought of as line Property distribution, then distribution function is：
Wherein, TbOn the basis of put temperature,For bore radius value, y represents the radius of circle that gear radial direction certain point is located Value,K is gear radial temperature linear distribution coefficient,For root radius value；
If room temperature is Ta, then m-th gear workpieces radial heat distortion error be：
2) online compensation process
2.1) determine calibration value
During m=1, carry out 1) in step 1.1) and 1.2), obtain first processing gear workpieces root radius ValueAnd radial heat distortion error is, finally willWithDifference as root radius calibration value rf：
2.2) determine the compensation rate of follow-up gear workpieces processing
When m >=2, carry out 1) in step 1.1) and 1.2), obtain the root radius of the gear workpieces of m-th processing ValueAnd radial heat distortion error is
Dry cut chain digital control gear hobbing machine bed Rolling-cut shear gear workpieces radial direction comprehensive process thermal deformation errors include dry cut numerical control rolling Tooth lathe radial heat distortion error and workpiece thermal expansion deformation error, calculate the root radius measured value of m-th gear workpiecesDifference with calibration value：
Wherein ΔmFor m-th gear workpieces radial direction comprehensive process thermal deformation errors, rfFor calibration value.
Thermal deformation errors according to m-th processed gear workpiecesCalculate when obtaining m-th gear workpieces of processing Lathe radial heat distortion error deltamT：
According to step 2.1) root radius error upper limit (USL) of gear workpieces that is calibrated and error floor (LSL) Determine root circle scale error permissible range；Comparison is dry to cut radial heat distortion when m-th gear workpieces processed by chain digital control gear hobbing machine bed Error deltamTWith step 2.1) root radius error upper limit (USL) of demarcated gear workpieces and error floor (LSL), draw Dry cut chain digital control gear hobbing machine bed process m+1 gear workpieces when compensation rate；Chain digital control gear hobbing machine bed radial heat distortion is cut due to dry Error increases with process time and progressively accumulates, and is a progressive formation, and therefore the present invention will distinguishWith As the dry upper and lower bound for cutting chain digital control gear hobbing machine bed radial heat distortion error compensation；IfThen hobboing cutter is radially mended The amount of repaying be δ=| ΔmT|；IfHobboing cutter radial compensation amount be δ=- | ΔmT|；If Then hobboing cutter radial compensation amount is 0；
2.3) by step 2.2) the hobboing cutter radial compensation amount of m-th gear workpieces processing that determines is converted into and dry cuts numerical control rolling Tooth lathe hobboing cutter radius compensation code, feeds back to the dry digital control system for cutting chain digital control gear hobbing machine bed, the m+1 gear workpieces is added Work carries out online compensation；
2.4), when the m+1 gear workpieces is machined, m, repeat step 2.2 are updated with m+1) and step 2.3).
The solution have the advantages that mathematical, dry cut thermal deformation of machine tool error machine real-Time Compensation be by laser Displacement transducer and infrared temperature sensor detect the change of workpiece to be machined radial contour size and temperature to lathe heat respectively Distortion inaccuracy is measured, and obtains feature size variable by methods such as characteristic size screening and cluster analyses, then Feature size variable and the dry relational model that cuts between thermal deformation of machine tool error is set up, finally by the real-time of survey calculation Thermal deformation errors, realize dry cut during machine tooling in machine real-Time Compensation.By error proposed by the invention in machine reality When compensation method can quickly and accurately obtain the dry thermal deformation errors for cutting chain digital control gear hobbing machine bed in process, and to dry The thermal deformation errors for cutting chain digital control gear hobbing machine bed are carried out in machine real-Time Compensation, can be effectively reduced dry chain digital control gear hobbing machine bed of cutting and added Percent defective during work, while also shorten the time for obtaining thermal deformation of machine tool error measure.
Description of the drawings
Fig. 1 is the schematic diagram of the present invention；
Fig. 2 cuts chain digital control gear hobbing machine bed radial heat distortion error calculation schematic diagram for dry；
Fig. 3 is gear workpieces thermal deformation measurement schematic diagram；
Fig. 4 is laser displacement sensor and infrared temperature sensor scheme of installation；
Fig. 5 is laser displacement sensor and infrared temperature sensor scheme of installation；
The schematic diagram that Fig. 6 is measured for gear workpieces radius value；
Root radius measured value when Fig. 7 is for demarcating gear workpieces；
Fig. 8 is the 20th and the 50th processed Gear Root radius of circle measured value.
In figure：Laser displacement sensor 1, launch window 101, receive window 102, infrared temperature sensor 2, gear workpieces 3, workbench 4, data collecting card 5, computer 6, machine tool numerical control system 7.
Specific embodiment
With reference to embodiment, the invention will be further described, but only should not be construed the above-mentioned subject area of the present invention It is limited to following embodiments.Without departing from the idea case in the present invention described above, according to ordinary skill knowledge and used With means, various replacements and change is made, all should include within the scope of the present invention.
A kind of dry chain digital control gear hobbing machine bed radial heat distortion error of cutting is in machine real-time compensation method, it is characterised in that include with Lower part：
1) setting measurement process
1.1) prototype gear root radius
Measured positioned at o-X using laser displacement sensor 1gYgZgThe gear workpieces 3 that m-th in coordinate system has just been processed Radial contour radius, m be natural number, the rotation axis of the gear workpieces 3 and o-XgYgZgThe Y of coordinate systemgOverlapping of axles, institute State o-XgYgZgThe X of coordinate systemgZgPlane is parallel with the end face of gear workpieces 3.The gear workpieces 3 are fixed on workbench 4.Institute The transmitting light beam for stating laser displacement sensor 1 is perpendicularly oriented to the rotation axis of gear workpieces 3, the laser displacement sensor 1 The plane that transmitting light beam and receiving light beam are located is designated as plane A, plane A and o-XgYgZgThe X of coordinate systemgYgBetween plane Angle is consistent with the helical angle of gear workpieces 3.
Using laser displacement sensor 1, the radial direction of the gear workpieces 3 just processed for m-th by triangulation measurement Profile radius, m are the serial number of the dry gear workpieces 3 for cutting the processing of chain digital control gear hobbing machine bed.
The launch window (101) of the laser displacement sensor 1 is with the rotation axis of gear workpieces 3 at a distance of L.The laser The transmitting light beam of displacement transducer 1 is perpendicularly oriented to the rotation axis of gear workpieces 3.What deserves to be explained is, the laser displacement is passed Line between the transmitter of sensor 1 and receiver is designated as line segment A.The length direction of the line segment A and the spiral of gear workpieces 3 When line direction is consistent so that root portion is illuminated, the reflected beams can not be blocked by the gear teeth, directly caught by receiver, entered And root portion is measured to the distance of gear centre.
3 number of teeth of the gear workpieces is z, and gear workpieces 3 are rotated with rotating speed nr/min on workbench 4, and laser displacement is passed The sample frequency of sensor 1 is f (secondary/s), and sampling workpiece rotating cycle is T, then 1 total number of sample points of laser displacement sensor is N：
The immediate data that laser displacement sensor 1 is measured is launch window (101) and the gear work of laser displacement sensor 1 The distance of 3 profile of partI-th radial contour half of m-th gear workpieces 3 can then be calculated Footpath is：
It is calculated all radial contour radius data collection of m-th gear workpieces 3 R is pressed Time order and function order is divided into p=T × z interval, then each interval includesIndividual radial contour radius data, takes each interval In minimum of a value, formed data set
After the singular value point removed in S by clustering algorithm, mean value is tried to achieveThe mean valueAs m-th tooth The root radius measured value of wheel workpiece 3.
1.2) gear radial heat distortion error is obtained
Temperature T of m-th gear workpieces 3 for just having processed is measured using infrared temperature sensor 2m.
The thermalexpansioncoefficientα of gear is determined according to 3 material of gear workpieces, and 3 radial temperature profile of gear workpieces is thought of as Linear distribution, then distribution function be：
Wherein, TbOn the basis of put temperature,For bore radius value, y represents the radius of circle that gear radial direction certain point is located Value,K is gear radial temperature linear distribution coefficient,For root radius value：
If room temperature is Ta, then m-th 3 radial heat distortion error of gear workpieces be：
2) online compensation process
2.1) determine calibration value
During m=1, carry out 1) in step 1.1) and 1.2), obtain first processing gear workpieces 3 root radius ValueAnd radial heat distortion error isFinally calculateWithDifference as root radius calibration value rf：
2.2) determine the compensation rate that follow-up gear workpieces 3 are processed
When m >=2, carry out 1) in step 1.1) and 1.2), obtain the root circle half of the gear workpieces 3 of m-th processing Footpath is worthAnd radial heat distortion error is
Dry cut 3 radial direction comprehensive process thermal deformation errors of chain digital control gear hobbing machine bed Rolling-cut shear gear workpieces include dry cut numerical control rolling Tooth lathe radial heat distortion error and workpiece thermal expansion deformation error, calculate the root radius measured value of m-th gear workpieces 3Difference with calibration value：
Wherein ΔmFor m-th 3 radial direction comprehensive process thermal deformation errors of gear workpieces, rfFor calibration value.
Thermal deformation errors according to m-th processed gear workpieces 3When calculating acquisition m-th gear workpieces 3 of processing Lathe radial heat distortion error deltamT：
Tooth root is determined according to the root radius error upper limit (USL) of the gear workpieces 3 being calibrated and error floor (LSL) Circle scale error permissible range；Comparison is dry to cut radial heat distortion error delta when m-th gear workpieces 3 processed by chain digital control gear hobbing machine bedmT With the root radius error upper limit and the error floor of the gear workpieces 3 being calibrated, draw processing m+1 gear workpieces 3 when Compensation rate.IfThen hobboing cutter radial compensation amount be δ=| ΔmT|.IfHobboing cutter radial compensation amount For δ=- | ΔmT|.IfThen hobboing cutter radial compensation amount is 0.
2.3) by step 2.2) the hobboing cutter radial compensation amount processed of m-th gear workpieces 3 for determining is converted into and dry cuts numerical control Gear hobbing lathe hobboing cutter radius compensation code, feeds back to the dry digital control system 7 for cutting chain digital control gear hobbing machine bed, to the m+1 gear workpieces 3 Processing carry out online compensation；
2.4), when the m+1 gear workpieces 3 is machined, m, repeat step 2.2 are updated with m+1) and step 2.3).
Embodiment 2
, with embodiment 1, specifically used automobile gearbox helical gear workpiece is used as processed tooth for the major part of the present embodiment Wheel workpiece 3, the analysis principle equivalent of spur gear workpiece, specifically include following steps：
1) processed gear workpieces 3 are helical gear, and modulus is 2mm, and the number of teeth is 41, and helical angle is 30 ° (left-handed), internal orifice dimension For 30mm, processed beveled gear teeth root radius is 44.457mm, and 1 measurement range of laser displacement sensor is 30 ± 4mm, laser 1 mounting distance of displacement transducer is set as 76mm；
2) installation direction of laser displacement sensor 1 according to processed oblique gear spiral angle and rotation direction, is adjusted, makes laser position The planar delta constituted with receiving light beam by 1 projecting beam of displacement sensor keeps one with the teeth directional direction of processed gear workpieces 3 Cause；
3) dry cut chain digital control gear hobbing machine bed start processing when, the trial cut for carrying out gear workpieces 3 first is each to adjust lathe Parameter；After the completion of lathe parameter being adjusted by trial cut gear workpieces 3, start to process gear workpieces 3, measure first processed tiltedly The root radius value of gear workpieces 3 is 44.465mm, as shown in figure 5, processed helical gear temperature is 51 DEG C, room temperature is 20 ℃；Then 3 thermal expansion deformation error of processed helical gear workpiece is：
Then root radius calibration value rfFor 44.460mm；
4) the 20th is measured respectively with the 50th processed Gear Root radius of circle using laser displacement sensor 1Its Value is respectivelyBy processed Gear Root radius of circle value and the batch tooth root Workpiece root radius calibration value rf=44.460mm is compared acquisition and dry cuts chain digital control gear hobbing machine bed Rolling-cut shear gear workpieces 3 Radial direction comprehensive process thermal deformation errors, Δ20=(44.473-44.460) mm=0.013mm, Δ50=(44.482- 44.460) mm=0.022mm；While measuring the temperature of processed gear workpieces 3 to calculate workpiece using infrared temperature sensor 2 Thermal expansion deformation error, its temperature value is respectively T20=55.9 DEG C, T50=58.8 DEG C, due to the heat convection of compressed air Effect, about 2 DEG C of the range of temperature of lathe internal measurements, therefore the temperature at datum mark b is follow-up processed It is considered that close to room temperature, workpiece heat distortion amount is respectively Δ in journey20TWf=0.006mm, Δ50TWf=0.0064mm is calculated Go out the dry radial heat distortion error that cuts during chain digital control gear hobbing machine bed Rolling-cut shear gear workpieces 3：
Δ20T=Δ20-Δ20TWf=0.013-0.006=0.007mm
Δ50T=Δ50-Δ50TWf=0.022-0.0064=0.0156mm
5) basis is calibrated the 3 root radius error upper limit (USL) of gear workpieces and error floor (LSL) determines root circle Scale error permissible rangeDue to Δ20T＞ 0, Δ50T＞ 0, therefore the dry of calculating should be cut chain digital control gear hobbing machine Bed radial heat distortion error withBe compared, i.e., withIt is compared, Δ20T =0.007mm ＞ 0.006mm, Δ50T=0.0156mm ＞ 0.006mm, then δ20=0.007mm, δ50=0.016mm.
6) in the data Ji Lu data collecting card 5 that the laser displacement sensor 1 and infrared temperature sensor 2 are gathered, And computer 6 is sent data to by data collecting card 5, the evaluation work of error is completed by computer 6, finally by computer 6 The bias compensation value input machine tool numerical control system 7 for being drawn, be converted into dry cut chain digital control gear hobbing machine bed hobboing cutter radius compensation code, rolling Knife actual diameter a size of 80mm, then the 20th processed gear workpieces 3 are corresponding dry cuts chain digital control gear hobbing machine bed radial heat distortion After error is converted into hobboing cutter radius compensation, a diameter of 79.986mm of hobboing cutter；50th processed gear workpieces 3 are corresponding dry to be cut After chain digital control gear hobbing machine bed radial heat distortion error is converted into hobboing cutter radius compensation, a diameter of 79.968mm of hobboing cutter.So as to realize Dry chain digital control gear hobbing machine bed radial heat distortion error of cutting is in machine real-Time Compensation.

Claims (1)

1. a kind of dry chain digital control gear hobbing machine bed radial heat distortion error of cutting is in machine real-time compensation method, it is characterised in that including following Part：
1) setting measurement process：
1.1) prototype gear root radius
Using laser displacement sensor (1), the radial direction of the gear workpieces (3) just processed for m-th by triangulation measurement Profile radius, m are the serial number of the dry batch gear workpieces (3) for cutting the processing of chain digital control gear hobbing machine bed；
The launch window (101) of laser displacement sensor (1) is with the rotation axis of gear workpieces (3) at a distance of L；The laser The transmitting light beam of displacement transducer (1) is perpendicularly oriented to the rotation axis of gear workpieces (3)；The transmitting of the Optical displacement sensor 1 The plane that light beam and receiving light beam are located is designated as plane A, and plane A is consistent with the teeth directional direction of gear workpieces (3)；
Gear workpieces (3) number of teeth is z, and gear workpieces (3) are rotated with rotating speed n (r/min) on workbench (4), laser position The sample frequency of displacement sensor (1) is f (secondary/s), and sampling workpiece rotating cycle is T, then laser displacement sensor (1) sampled point Sum is N：
N = 60 · T · f n
The immediate data that laser displacement sensor (1) is measured is launch window (101) and the gear work of laser displacement sensor (1) The distance of part (3) profileI=1,2 ... ..., N；I-th radial contour radius of m-th gear workpieces (3) can then be calculated For：
r m i = L - y m i
It is calculated all radial contour radius data collection R=of m-th gear workpieces (3)By R on time Between sequencing be divided into p=T × z interval, then each interval includesIndividual radial contour radius data, takes in each interval Minimum of a value, formed data set
After the singular value point removed in S by clustering algorithm, mean value is tried to achieve
1.2) gear radial heat distortion error is obtained
Temperature T of m-th gear workpieces (3) the radial direction flank profil part just processed using infrared temperature sensor (2) measurementm；
The thermalexpansioncoefficientα of gear is determined according to gear workpieces (3) material, and gear workpieces (3) radial temperature profile is thought of as Linear distribution, then distribution function be：
T y = k ( y - r m 1 ) + T b
Wherein, TbOn the basis of put temperature,For bore radius value, y represents the radius value of circle that gear radial direction certain point is located,K is gear radial temperature linear distribution coefficient,For root radius value；
If room temperature is Ta, then m-th gear workpieces (3) radial heat distortion error be：
Δ m T W f = ∫ r m 1 r m f α [ k ( y - r m 1 ) + T b - T a ] d y
2) online compensation process：
2.1) determine calibration value
Dry cut chain digital control gear hobbing machine bed process a batch first gear when, make m=1, carry out 1) in step 1.1) and step Rapid 1.2), obtain the root radius value of the gear workpieces (3) of first processingAnd radial heat distortion errorFinally WillWithDifference as present lot root radius calibration value rf：
r f = r 1 f - Δ 1 T W f
2.2) determine the compensation rate that follow-up gear workpieces (3) are processed
Dry cut chain digital control gear hobbing machine bed continue procedure of processing 2.1) batch gear when, i.e., m >=2, carry out 1) in step 1.1) and step 1.2), obtain the root radius value of the gear workpieces (3) of m-th processingAnd radial heat distortion error is
Dry chain digital control gear hobbing machine bed Rolling-cut shear gear workpieces (3) radial direction comprehensive process thermal deformation errors of cutting include dry to cut numerical control gear hobbing Lathe radial heat distortion error and workpiece thermal expansion deformation error, calculate the root radius measured value of m-th gear workpieces (3)Difference with calibration value：
Δ m = r m f - r f
Wherein ΔmFor m-th gear workpieces (3) radial direction comprehensive process thermal deformation errors, rfFor calibration value；
Thermal deformation errors according to m-th processed gear workpieces (3)When calculating acquisition m-th gear workpieces (3) of processing Lathe radial heat distortion error deltamT：
Δ m T = Δ m - Δ m T W f
According to step 2.1) root radius error upper limit (USL) of gear workpieces (3) that is calibrated and error floor (LSL) are really Determine root circle scale error permissible range；Comparison is dry to cut radial heat distortion when m-th gear workpieces (3) processed by chain digital control gear hobbing machine bed Error deltamTWith step 2.1) root radius error upper limit (USL) of demarcated gear workpieces (3) and error floor (LSL), obtain Go out dry cut chain digital control gear hobbing machine bed process the m+1 gear workpieces (3) when compensation rate.Chain digital control gear hobbing machine bed radially heat is cut due to dry Distortion inaccuracy increases with process time and progressively accumulates, and is a progressive formation, and therefore the present invention respectively willWithAs the dry upper and lower bound for cutting chain digital control gear hobbing machine bed radial heat distortion error compensation；IfThen hobboing cutter footpath To compensation rate for δ=| ΔmT|；IfHobboing cutter radial compensation amount be δ=- | ΔmT|；If Then hobboing cutter radial compensation amount is 0；
2.3) by step 2.2) the hobboing cutter radial compensation amount processed of m-th gear workpieces (3) for determining is converted into and dry cuts numerical control rolling Tooth lathe hobboing cutter radius compensation code, feeds back to the dry digital control system for cutting chain digital control gear hobbing machine bed, to the m+1 gear workpieces (3) Processing carry out online compensation；
2.4), when the m+1 gear workpieces (3) machines, m, repeat step 2.2 are updated with m+1) and step 2.3).
CN201710001859.8A 2017-01-03 2017-01-03 The dry chain digital control gear hobbing machine bed radial heat distortion error of cutting of one kind is in machine real-time compensation method Active CN106483928B (en)

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CN108037660A (en) * 2017-11-28 2018-05-15 重庆大学 A kind of dry chain digital control gear hobbing machine bed of cutting cuts space temperature rise optimization regulating method
CN108406011A (en) * 2018-02-05 2018-08-17 重庆机床(集团)有限责任公司 Compensation device is moved in machine laser detection Gear Processing size
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CN112935417A (en) * 2021-01-21 2021-06-11 河南科技大学 Large gear ring machining method and device based on temperature control system
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CN114646284B (en) * 2022-03-16 2023-08-11 重庆邮电大学 Temperature compensation method for geometric parameters of precise gear

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