CN104128884B - The profile error control method of worm grinder and device - Google Patents

The profile error control method of worm grinder and device Download PDF

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Publication number
CN104128884B
CN104128884B CN201410354513.2A CN201410354513A CN104128884B CN 104128884 B CN104128884 B CN 104128884B CN 201410354513 A CN201410354513 A CN 201410354513A CN 104128884 B CN104128884 B CN 104128884B
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China
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emery wheel
worm screw
ccd
tooth
slide block
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CN201410354513.2A
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CN104128884A (en
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周建忠
蒋萍
陈寒松
黄舒
朱涛
刘伟
张建亮
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江苏大学
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B51/00Arrangements for automatic control of a series of individual steps in grinding a workpiece
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/12Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation involving optical means

Abstract

A kind of profile error control method for worm grinder and device, it is characterised in that described device mainly includes that dresser, optical system, CCD are as sensor, computer data acquiring and processing system, RF transmitter, induction apparatus and digital control system.Dresser is positioned at the top, and optical system is arranged in machine shield, between emery wheel and ZK worm screw;The other end that CCD is positioned at emery wheel as sensor, computer data acquiring and processing system is easy to receive signal, and RF transmitter is arranged on the workbench left side, and induction apparatus is fixed on the right side of workbench.The present invention passes through CCD projection measurement and infrared induction technology, more convenient grasp abrasion of grinding wheel situation, the length feed amount whether accurate and required to cutter more accurately, it is achieved the profile error of ZK worm screw controls.

Description

The profile error control method of worm grinder and device

Technical field

The present invention relates to a kind of for Machining Technology, especially a kind of worm grinder profile error controls technology, a kind of profile error control method in ZK worm grinder and device.

Background technology

Worm-drive has the features such as speed reducing ratio big, compact conformation, stable drive, is widely used in various actuating device and indexing mechanism.In normal cylindrical worm gear drive, ZK worm-drive can use grinding precise forming, bearing capacity height, life-span long, is suitable for batch production, is a kind of machine driving form being worth promoting.Along with the development of industrial technology, worm gear pair is had higher requirement at the aspect such as bearing capacity, transmission accuracy.The quality of grinding affects profile accuracy and the surface roughness etc. of ZK worm screw.

Tradition grinding occurring, a large amount of smog explanation emery wheel is blunt, needs to start dresser.But occurring that the reason of smog is a lot, such as mill amount is too big, and the emery wheel run up will produce a lot of cigarette beyond its bearing capacity, the even ablation worm screw face having;The too fast meeting of turning withdrawing causes built-up edge, and during grinding withdrawing position, mill amount increases suddenly, also brings a large amount of smog.Thus it is difficult to the accurate assurance crushing time, simply judge by rule of thumb.Traditional emery wheel is to allow emery wheel slowly near ZK worm screw teeth groove (back turning leaves surplus) to cutter, when having gap and range difference to stop time few with left and right sides, stir emery wheel sky with hands to turn around, if worm screw rotates freely, be shut off cooling system, activate switch makes emery wheel run up in original place, observe emery wheel both sides spark the most symmetrical, if both sides as many time, it is accurate to illustrate cutter, open coolant, can machined.General 20 are put in, so reducing accordingly during length feed during to cutter.The least ZK worm screw of modulus is thin due to teeth groove, cutter is forbidden emery wheel easily break and breach occurs, shortens the service life of emery wheel.Grinding process does not knows about emery wheel wear extent, inaccurate on cutter, the amount of feeding can not be controlled all will affect the quality of ZK worm screw working surface, increase profile error, reduce machining accuracy, make transmission unstable, the scrappage of increase worm screw.

Retrieval to existing document finds, China Patent Publication No. CN 102581763A automatic tool setting system for ultra-precision grinding machine, by being fixed on image transmitting above machine shield after camera imaging to processor, according to conversion, data processing software supporting in processor determines that workpiece and emery wheel are in photographic head coordinate system X, Y, the axial position data of Z, and obtain workpiece and the emery wheel X at workpiece coordinate system according to coordinate transform, Y, Z direction of principal axis location, determine the distance of cutter point under the processing initial point of workpiece in workpiece coordinate system and emery wheel, and calculate generation ultra-precision grinding machine digital control system discernible NC file, complete automatic tool preset, reduce the grinding process time, improve efficiency.

But, when emery wheel and workpiece are in different positions, before (emery wheel lengthwise movement, workpiece traverse feed) processing i.e. every time, photographic head will shoot once, and cost is higher, and ignore emery wheel and constantly wear and tear the situation that radius can reduce, simply emery wheel and the center of workpiece of its picked-up.

Chinese patent publication No. CN 101733705A abrasion of grinding wheel detects and compensation method automatically, it is characterized in that: use dresser that the automatic grinding wheel finishing after grinding is circulated, the grinding wheel diameter data using grinding wheel diameter detector to obtain after the grinding wheel diameter in processing is carried out on-line checking, detection are sent to digital control system, digital control system by grinding wheel diameter data compared with original grinding wheel diameter data, obtaining abrasion of grinding wheel amount and crushing amount, digital control system controls the depth of cut of lathe thus realizes the automatic compensation of emery wheel.

But the document only considers the change of length feed, does not accounts for transverse movement.The diameter of grinding process medium sand wheel disc can reduce, and the transverse tooth thickness at tooth top and reference circle also reduces, thus the worm screw tooth depth that grinding goes out is to reach, but teeth groove may be unsatisfactory for condition.

Another China Patent Publication No. CN 101456159A spark identification presetting cutter method and abrasive machining automatic system, first workpieces surface condition is detected with image capture method Real-time Collection, image processing software carries out real time threshold examination to information, the friction spark that emery wheel contact surface of the work produces once detected, image high threshold rises to the threshold threshold value set, and stops grinding wheel movement and the corresponding program of startup simultaneously and servo actuator starts grinding.

Spark identification presetting cutter method and abrasive machining automatic system, friction spark information when energy real-time capture emery wheel contacts with finished surface, compare operator and with the naked eye differentiate progressive many, but spark moves towards possible asymmetric when during worm screw is processed, teeth groove has grinding residue, if the worm screw that processing modulus is bigger, grinding needs a point left surface, right flank, three, bottom surface part to carry out, the spark captured also is that the spark near processing that face, which face is many, so having some limitations, it is difficult to ensure that to cutter accuracy.

Summary of the invention

The purpose of the present invention is big for existing worm grinder crushing difficulty, the uncontrollable problem of precision, it is provided that the profile error control method of a kind of worm grinder and device.

One of technical scheme:

A kind of worm grinder profile error control method, is characterized in that it comprises the following steps

First, needing the modulus of machining worm, diameter quotient and head number to digital control system input, digital control system calculates corresponding reference circle, outside circle, addendum thickness and tooth depth size automatically;

Secondly, with CCD projection measurement and the diameter of infrared induction commercial measurement emery wheel;

One optical system is installed in machine shield, between emery wheel and worm screw, emery wheel reference circle and tooth top can be irradiated to when not feeding, emery wheel and worm screw the region deposited can be irradiated to again when feeding;Light source uses infrared light, strong interference immunity, and light defines light curtain, light curtain directive emery wheel by optical system, and now grinding machine is off motion, it is therefore intended that image stabilization;CCD is positioned at the other end of emery wheel as sensor, computer data acquiring and processing system, directive CCD is blocked a part as the directional light of sensor by emery wheel, therefore CCD has a breach as the signal that sensor exports, the length on each limit of breach and the size of emery wheel have relation one to one, computer data acquiring is utilized to obtain the CCD pixel number that breach is corresponding with processing system, whether CCD pixel number contrasts in range of error with calculated value, if gone beyond the scope, just make emery wheel high speed rotating but not length feed, use dresser finishing;

3rd, length feed emery wheel, stops at distance worm screw tooth top cylindrical 3-5 mm, in order to later stage feeding, surveys length feed amount;If stopped in the teeth groove of worm screw, need first to step back to be further continued for feeding;Open optical system, the anterior helical tooth part with worm screw of light curtain directive emery wheel that light is formed by optical system;Directive CCD blocks a part as anterior by emery wheel and worm screw the helical tooth part of the directional light of sensor, therefore the signal that CCD exports as sensor is jagged, utilize computer data acquiring to obtain the CCD pixel number that breach is corresponding with processing system, two side clearances can be drawn through calculating;Which side the most just moves toward which side in gap, and amount of movement can also be calculated by difference gap;Hand feed is used instead after cutter is completed;

4th, on the workbench left side, one RF transmitter is installed, its fluorescent tube of launching is designed to a circle circle to the shape of external diffusion;Which group tip diameter according to worm screw selects launch fluorescent tube, makes infrared ray just fall on the outside circle of worm screw and sensed device receives;Induction apparatus is fixed on the right side of workbench, and containing photoconductive resistance, the when of infrared ray radiation, the resistance of photoconductive resistance is the least, when object has shade to occur through out-of-date, and its resistance changes and then produces alternating current;When length feed to emery wheel tooth top overlaps with worm screw tooth top cylindrical, the sensing of the photoconductive resistance in induction apparatus light changes and amplifies signal and feeds back to digital control system;Emery wheel suspends, and digital control system remembers this lengthwise position, and emery wheel exits, and workbench moves on to left side starting point and starts grinding.

Described dresser includes model, guide rail, slide block, phase place contact block and diamond pen, model is arranged to 20 ° of inclinations angle and is symmetrically mounted on two, guide rail is with scale, how many strokes determines according to the thickness of emery wheel, slide block moves up and down along gathering sill back and forth according to required stroke, two phase place contact block and phaseswitch are reversely installed, to receive corresponding signal, when slide block encounters left phase place contact block, left phaseswitch feeds back signal to right phaseswitch, right phaseswitch controls right phase place contact block, and slide block accepts the instruction of right phase place contact block in return course and moves.Moving back and forth along with slide block, thimble moves up and down also along 20 ° of hypotenuses of model, and then drives diamond pen;Below diamond pen, two working positions are designed as 20 °, it is simple to finishing stone face;The tooth top cylindrical finishing of emery wheel is whetted a knife, and along with the quick rotation of emery wheel, whets a knife and tooth top is polished, be then shut off motor switch, and whether the size measuring tooth top meets requirement, is unsatisfactory for just repeating above step till meeting.

The two of technical scheme.

A kind of worm grinder profile error controls device, it is characterized in that it mainly includes wheel dresser, optical system 13, CCD is as sensor 14, computer data acquiring and processing system 25, RF transmitter 15, induction apparatus 16 and digital control system 17, described optical system 13 is infrared light supply, it is arranged in machine shield, between emery wheel and ZK worm screw at the upper position of emery wheel 11, emery wheel reference circle and tooth top can be irradiated to during not feeding, emery wheel and worm screw the region deposited can be irradiated again during feeding, for sensing the CCD of optical system 13 as sensor 14 is arranged close to the lower position of emery wheel 11 and is electrically connected with computer data acquiring and processing system 25;RF transmitter 15 is arranged on the side of worm screw 12, and the induction apparatus 16 matched with RF transmitter 15 is arranged on the opposite side of worm screw 12, and induction apparatus 16 is electrically connected with digital control system 17;nullDescribed wheel dresser includes two diamond pens 10 laying respectively at emery wheel both sides,The work portion of each diamond pen 10 is designed to the 20 degree of angles matched with emery wheel 10 work portion,Each diamond pen 10 is connected with corresponding thimble 9,The needle point of thimble 9 offsets with the model 1 that oblique angle is 20,The drive end of thimble is connected with slide block 3,Slide block 3 moves up and down in the gathering sill 4 of guide rail 2,Right phaseswitch 5 it is separately installed with in the side of gathering sill 4、Left phase place sky closes 6、Right phase place contact block 7 and left phase place contact block 8,Guide rail 2 is with scale,The stroke of slide block 3 is determined by the thickness of emery wheel 11,Slide block 3 moves up and down along gathering sill 4 back and forth according to required stroke,Two described phase place contact blocks and two phaseswitch are reversely installed,To receive corresponding signal,When slide block 3 encounters left phase place contact block 8, left phaseswitch 6 feeds back signal to right phaseswitch 5,Right phaseswitch 5 controls right phase place contact block 7,Slide block 3 accepts the instruction of right phase place contact block 7 in return course and moves.Along with moving back and forth of slide block 3, thimble 9 moves up and down also along 20 ° of hypotenuses of model, and then drives diamond pen 10 to complete the finishing to emery wheel.

Described directive CCD is blocked a part as the directional light of sensor, therefore the signal that CCD exports as sensor is jagged, the length on each limit of breach has relation one to one with the size of emery wheel or worm screw, utilize computer data acquiring to obtain the CCD pixel number that breach is corresponding with processing system, and then realize abrasion of grinding wheel detection and accurately to cutter.

The fluorescent tube of launching of described RF transmitter 15 is designed to a circle circle to the shape of external diffusion, selects which group to launch fluorescent tube according to the tip diameter of worm screw, makes infrared ray just fall on the outside circle of worm screw and sensed device 16 receives;When length feed to emery wheel tooth top overlaps with worm screw tooth top cylindrical, the sensing of the photoconductive resistance in induction apparatus 16 light change and amplifies signal and feeds back to digital control system 17, and emery wheel time-out, digital control system 17 remembers this lengthwise position.

The invention has the beneficial effects as follows:

CCD projection measurement stability is preferable, and CCD self-scanning resolution own is high, highly sensitive, compact conformation, position are accurate;Infrared induction is highly sensitive, safe and reliable.By CCD projection measurement and infrared induction technology, more convenient abrasion of grinding wheel situation, the length feed amount whether accurate and required to cutter can be grasped more accurately, it is achieved the profile error of worm screw controls.

The inventive method is simple, easy, and control accuracy is high, and apparatus structure is simple, it is easy to accomplish.

Accompanying drawing explanation

Fig. 1 is the profile error control flow chart of the ZK worm grinder of the embodiment of the present invention.

Fig. 2 is that the ZK worm grinder profile error of the embodiment of the present invention controls device schematic diagram.

Fig. 3 is the optical system location schematic diagram of the present invention.

Fig. 4 is the part between CCD projection measurement emery wheel tooth top and the reference circle of the present invention and contrasts schematic diagram with former theoretical value.

Fig. 5 is the CCD projection measurement emery wheel of the present invention and worm screw and deposits area schematic.

Fig. 6 is the RF transmitter schematic diagram of the present invention.

Fig. 7 is that the infrared ray of the present invention enters schematic diagram through ZK tip circle of worm sensing emery wheel.

Fig. 8 is the inductor circuit figure of the present invention.

In figure: 1 model, 2 guide rails, 3 slide blocks, 4 gathering sills, 5 right phaseswitch, 6 left phaseswitch, 7 right phase place contact blocks, 8 left phase place contact blocks, 9 thimbles, 10 diamond pens, 11 emery wheels, 12 ZK worm screws, 13 optical systems, 14 CCD are as sensor, 15 RF transmitters, 16 induction apparatuss, 17 digital control systems, 18 emery wheel reference circles and tooth top calculated value, 19 emery wheel reference circles and tooth top CCD pixel number, 20 light curtains, 21 emery wheels are anterior, the helical tooth part of 22 ZK worm screws, 23 infrared ray, 24 launch fluorescent tube, 25 computer data acquirings and processing system, 26 emery wheel reference circles, 27 emery wheel tooth tops.

Specific embodiments

The present invention is further illustrated for the embodiment of Structure Figure below.

Embodiment one.

A kind of ZK worm grinder profile error control method, as shown in Figure 1, when processing the ZK worm screw 12 of a kind of different parameters, first inputting the modulus of ZK worm screw 12, diameter quotient and head number to digital control system 17, digital control system 17 is through calculating corresponding reference circle, tooth top, tooth depth equidimension.

Along with the carrying out of grinding, emery wheel 11 can gradually wear out, and diameter, from 500mm(emery wheel 11 original diameter, also has 400mm's) it is reduced to 300mm.Emery wheel 11 just uses when, be the most only just easily controlled profile error, in the case of cutter is had no problem, due to diameter certain length feed amount it is also determined that, workbench only needs traverse feed it is ensured that profile accuracy.

Along with the abrasion of emery wheel 11, its diameter tapers into, and measure highly difficult, needs emery wheel 11 to disassemble independent measurement, because emery wheel 11 is integrally fixed on grinding machine, dismantles very inconvenient.Based on this, the present embodiment consideration CCD projection measurement and infrared induction technology solve.

The optical system 13 of CCD projection measurement is installed and (can be reduced the pollution of coolant etc.) in machine shield, between emery wheel 11 and ZK worm screw 12, as it is shown on figure 3, emery wheel 11 reference circle 26 and tooth top 27 can be irradiated at ordinary times, emery wheel 11 and worm screw 12 region deposited during feeding, can be irradiated again.Light source uses longer wavelengths of infrared light, strong interference immunity, and light defines light curtain 20(such as Fig. 4 by optical system 13), light curtain 20 directive emery wheel 11, now grinding machine is off motion, it is therefore intended that image stabilization.CCD is positioned at the other end of emery wheel 11 as sensor 14, computer data acquiring and processing system 25, directive CCD is blocked a part as the directional light of sensor 14 by emery wheel 11, therefore CCD has a breach as the signal that sensor 14 exports, the length on each limit of breach and the size of emery wheel 11 have relation one to one, computer data acquiring is utilized to obtain the CCD pixel number 19 that breach is corresponding with processing system 25, whether CCD pixel number 19 and calculated value 18 contrast in range of error, such as Fig. 4.

If gone beyond the scope, just make emery wheel 11 high speed rotating but not length feed, use dresser finishing.Dresser is mainly formed (see figure 2) by following components: model 1 is arranged to 20 ° of inclinations angle (normal pressure angle is 20 °) and is symmetrically mounted on two, guide rail 2 is with scale, how many strokes determines according to the thickness of emery wheel 11, slide block 3 moves up and down along gathering sill 4 back and forth according to required stroke, phase place contact block 7, 8 and phaseswitch 5, 6 reversely install, to receive corresponding signal, when slide block 3 encounters phase place contact block 8, phaseswitch 6 feeds back signal to phaseswitch 5, phaseswitch 5 controls phase place contact block 7, slide block 3 accepts the instruction of phase place contact block 7 in return course and moves.Along with moving back and forth of slide block 3, thimble 9 moves up and down also along 20 ° of hypotenuses of model 1, and then drives diamond pen 10.Diamond pen 10 two working positions below are designed as 20 °, it is simple to finishing emery wheel 11 work surface.Tooth top 27 cylindrical finishing of emery wheel 11 is whetted a knife, and along with the quick rotation of emery wheel 11, whets a knife and tooth top 27 is polished, being then shut off motor switch, whether the size measuring tooth top 27 meets requirement, is unsatisfactory for just repeating above step till meeting, general grinding 2,3 times tooth top 27 is the most up to standard.

Length feed emery wheel 11, near ZK worm screw 12 and leave certain distance (3 ~ 5 mm) place and stop, this is easy for later stage feeding, surveys length feed amount.If stopping in the teeth groove of ZK worm screw 12, stepping back within beyond outside circle 5 mm of worm screw 12, being further continued for feeding.Opening optical system 13, the helical tooth part 22 of the anterior 21 and ZK worm screws 12 of light curtain 20 directive emery wheel that light is formed by optical system 13, such as Fig. 5.Directive CCD is blocked a part as the directional light of sensor 14 by the helical tooth part 22 of the anterior 21 and ZK worm screws 12 of emery wheel, therefore the signal that CCD exports as sensor 14 is jagged, the size of the helical tooth part 22 of the length on each limit of breach 21 and ZK worm screws 12 anterior with emery wheel has relation one to one, utilize computer data acquiring to obtain the CCD pixel number that breach is corresponding with processing system 25, two side clearances can be drawn through calculating.Which side the most just moves toward which side in gap, and amount of movement can also be calculated by difference gap.Hand feed is used instead after cutter is completed.

RF transmitter 15 is arranged on the workbench left side, and its fluorescent tube 24 of launching is designed to circle column-shaped circular hole to the shape of external diffusion, as shown in Figure 6.Which group tip diameter according to ZK worm screw 12 selects launch fluorescent tube 24, makes infrared ray 23 just fall on the outside circle of ZK worm screw 12 and sensed device 16 receives.Induction apparatus 16 is fixed on the right side of workbench, and containing photoconductive resistance R1, the when of infrared ray radiation, the resistance of photoconductive resistance R1 is the least, when object has shade to occur through out-of-date, and its change in resistance and then generation alternating current.R2, R3, R4, R5 are fixed resistances, and C1, C2 are electric capacity, and AC signal can be allowed to pass through and stop direct current signal, and C2 is again a feedback capacity, improve amplification effect;Q1, Q2 are audions, and VCC represents that DC power anode, GND represent DC power cathode, and IN, OUT represent signal input and output respectively.When light intensity changes, AC signal produces and amplifies to common emitter amplifying circuit after C1.Photoconductive resistance R1 provides audion bias current, and R3 is collector resistance.When length feed to emery wheel tooth top 27 overlaps with ZK worm screw 12 tooth top cylindrical, the sensing of the photoconductive resistance in induction apparatus 16 light changes and amplifies signal and feeds back to digital control system 17.Emery wheel 11 suspends, and digital control system 17 remembers this lengthwise position, and such grinding depth is just easy to hold, i.e. the tooth depth of ZK worm screw.Emery wheel 11 exits, and workbench moves on to left side starting point and starts grinding.

Embodiment two.

As illustrated in figs. 2 through 8.

nullA kind of worm grinder profile error controls device,It mainly includes wheel dresser、Optical system 13、CCD is as sensor 14、Computer data acquiring and processing system 25、RF transmitter 15、Induction apparatus 16 and digital control system 17,As shown in Figure 2,Described optical system 13 is infrared light supply,It is arranged in machine shield、(can be irradiated to during not feeding at reference circle and the tooth top of emery wheel 11 at the upper position of emery wheel 11 between emery wheel 11 and ZK worm screw 12,Emery wheel 11 and worm screw 12 region deposited can be irradiated again) during feeding,As shown in Figure 3,Optical system 13 is faced as sensor 14 for sensing the CCD of optical system 13,It is positioned at the lower section of emery wheel 11 and is electrically connected with computer data acquiring and processing system 25,Optical system 13 directive CCD is blocked a part as the directional light of sensor 14 by emery wheel 11,Therefore CCD has a breach as the signal that sensor 14 exports,The length on each limit of breach and the size of emery wheel 11 have relation one to one,Computer data acquiring is utilized to obtain the CCD pixel number 19 that breach is corresponding with processing system 25,Whether CCD pixel number 19 and calculated value 18 contrast in range of error,Such as Fig. 4;RF transmitter 15 is arranged on the side of worm screw 12, and the induction apparatus 16 matched with RF transmitter 15 is arranged on the opposite side of worm screw 12, and induction apparatus 16 is electrically connected with digital control system 17;nullDescribed wheel dresser includes two diamond pens 10 laying respectively at emery wheel both sides,The work portion of each diamond pen 10 is designed to the 20 degree of angles matched with emery wheel 10 work portion,Each diamond pen 10 is connected with corresponding thimble 9,The needle point of thimble 9 offsets with the model 1 that oblique angle is 20,The drive end of thimble is connected with slide block 3,Slide block 3 moves up and down in the gathering sill 4 of guide rail 2,Right phaseswitch 5 it is separately installed with in the side of gathering sill 4、Left phase place sky closes 6、Right phase place contact block 7 and left phase place contact block 8,Guide rail 2 is with scale,The stroke of slide block 3 is determined by the thickness of emery wheel 11,Slide block 3 moves up and down along gathering sill 4 back and forth according to required stroke,Two described phase place contact blocks and two phaseswitch are reversely installed,To receive corresponding signal,When slide block 3 encounters left phase place contact block 8, left phaseswitch 6 feeds back signal to right phaseswitch 5,Right phaseswitch 5 controls right phase place contact block 7,Slide block 3 accepts the instruction of right phase place contact block 7 in return course and moves.Along with moving back and forth of slide block 3, thimble 9 moves up and down also along 20 ° of hypotenuses of model, and then drives diamond pen 10 to complete the finishing to emery wheel.Described directive CCD is blocked a part as the directional light of sensor, therefore the signal that CCD exports as sensor is jagged, the length on each limit of breach has relation one to one with the size of emery wheel or worm screw, computer data acquiring is utilized to obtain the CCD pixel number that breach is corresponding with processing system, and then realize abrasion of grinding wheel detection and accurately to cutter, as shown in Figure 5.

The fluorescent tube of launching of described RF transmitter 15 is designed to the circle circle shape (such as Fig. 6) to external diffusion, which group tip diameter according to worm screw selects launch fluorescent tube 24, make infrared ray 23 just fall on the outside circle of worm screw and sensed device 16 receives, as shown in Figure 7;When length feed to emery wheel tooth top overlaps with worm screw tooth top cylindrical, the sensing of the photoconductive resistance in induction apparatus 16 light change and amplifies signal and feeds back to digital control system 17, and emery wheel time-out, digital control system 17 remembers this lengthwise position.Induction apparatus 16 is fixed on the right side of workbench, and containing photoconductive resistance R1, the when of infrared ray radiation, the resistance of photoconductive resistance R1 is the least, when object has shade to occur through out-of-date, its change in resistance and then generation alternating current, as shown in Figure 8, R2, R3, R4, R5 is fixed resistance, C1, C2 are electric capacity, and AC signal can be allowed to pass through and stop direct current signal, C2 is again a feedback capacity, improves amplification effect;Q1, Q2 are audions, and VCC represents that DC power anode, GND represent DC power cathode, and IN, OUT represent signal input and output respectively.When light intensity changes, AC signal produces and amplifies to common emitter amplifying circuit after C1.Photoconductive resistance R1 provides audion bias current, and R3 is collector resistance.When length feed to emery wheel tooth top 27 overlaps with ZK worm screw 12 tooth top cylindrical, the sensing of the photoconductive resistance in induction apparatus 16 light changes and amplifies signal and feeds back to digital control system 17.Emery wheel 11 suspends, and digital control system 17 remembers this lengthwise position, and such grinding depth is just easy to hold, i.e. the tooth depth of ZK worm screw.Emery wheel 11 exits, and workbench moves on to left side starting point and starts grinding.

Part that the present invention does not relate to is same as the prior art maybe can use prior art to be realized.

Claims (5)

1. a worm grinder profile error control method, is characterized in that it comprises the following steps:
First, needing the modulus of machining worm, diameter quotient and head number to digital control system input, digital control system calculates corresponding reference circle, outside circle, addendum thickness and tooth depth size automatically;
Secondly, with CCD projection measurement and the diameter of infrared induction commercial measurement emery wheel;
One optical system is installed in machine shield, between emery wheel and worm screw, emery wheel reference circle and tooth top can be irradiated to when not feeding, emery wheel and worm screw the region deposited can be irradiated to again when feeding;Light source uses infrared light, strong interference immunity, and light defines light curtain, light curtain directive emery wheel by optical system, and now grinding machine is off motion, it is therefore intended that image stabilization;CCD is positioned at the other end of emery wheel as sensor, computer data acquiring and processing system, directive CCD is blocked a part as the directional light of sensor by emery wheel, therefore CCD has a breach as the signal that sensor exports, the length on each limit of breach and the size of emery wheel have relation one to one, computer data acquiring is utilized to obtain the CCD pixel number that breach is corresponding with processing system, whether CCD pixel number contrasts in range of error with calculated value, if gone beyond the scope, just make emery wheel high speed rotating but not length feed, use dresser finishing;
3rd, length feed emery wheel, stops at distance worm screw tooth top cylindrical 3-5 mm, in order to later stage feeding, surveys length feed amount;If stopped in the teeth groove of worm screw, need first to step back to be further continued for feeding;Open optical system, the anterior helical tooth part with worm screw of light curtain directive emery wheel that light is formed by optical system;Directive CCD blocks a part as anterior by emery wheel and worm screw the helical tooth part of the directional light of sensor, therefore the signal that CCD exports as sensor is jagged, utilize computer data acquiring to obtain the CCD pixel number that breach is corresponding with processing system, two side clearances can be drawn through calculating;Which side the most just moves toward which side in gap, and amount of movement can also be calculated by difference gap;Hand feed is used instead after cutter is completed;
4th, on the workbench left side, one RF transmitter is installed, its fluorescent tube of launching is designed to a circle circle to the shape of external diffusion;Which group tip diameter according to worm screw selects launch fluorescent tube, makes infrared ray just fall on the outside circle of worm screw and sensed device receives;Induction apparatus is fixed on the right side of workbench, and containing photoconductive resistance, the when of infrared ray radiation, the resistance of photoconductive resistance is the least, when object has shade to occur through out-of-date, and its resistance changes and then produces alternating current;When length feed to emery wheel tooth top overlaps with worm screw tooth top cylindrical, the sensing of the photoconductive resistance in induction apparatus light changes and amplifies signal and feeds back to digital control system;Emery wheel suspends, and digital control system remembers this lengthwise position, and emery wheel exits, and workbench moves on to left side starting point and starts grinding.
Method the most according to claim 1, it is characterized in that described dresser includes model, guide rail, slide block, phase place contact block and diamond pen, model is arranged to 20 ° of inclinations angle and is symmetrically mounted on two, guide rail is with scale, how many strokes determines according to the thickness of emery wheel, slide block moves up and down along gathering sill back and forth according to required stroke, two phase place contact block and phaseswitch are reversely installed, to receive corresponding signal, when slide block encounters left phase place contact block, left phaseswitch feeds back signal to right phaseswitch, right phaseswitch controls right phase place contact block, slide block accepts the instruction of right phase place contact block in return course and moves;Moving back and forth along with slide block, thimble moves up and down also along 20 ° of hypotenuses of model, and then drives diamond pen;Below diamond pen, two working positions are designed as 20 °, it is simple to finishing stone face;The tooth top cylindrical finishing of emery wheel is whetted a knife, and along with the quick rotation of emery wheel, whets a knife and tooth top is polished, be then shut off motor switch, and whether the size measuring tooth top meets requirement, is unsatisfactory for just repeating above step till meeting.
3. a worm grinder profile error controls device, it is characterized in that it mainly includes wheel dresser, optical system (13), CCD is as sensor (14), computer data acquiring and processing system (25), RF transmitter (15), induction apparatus (16) and digital control system (17), described optical system (13) is infrared light supply, it is arranged in machine shield, between emery wheel and ZK worm screw at the upper position of emery wheel (11), emery wheel reference circle and tooth top can be irradiated to during not feeding, emery wheel and worm screw the region deposited can be irradiated again during feeding, for sensing the CCD of optical system (13) as sensor (14) is arranged close to the lower position of emery wheel (11) and is electrically connected with computer data acquiring and processing system (25);RF transmitter (15) is arranged on the side of worm screw (12), and the induction apparatus (16) matched with RF transmitter (15) is arranged on the opposite side of worm screw (12), and induction apparatus (16) is electrically connected with digital control system (17);nullDescribed wheel dresser includes two diamond pens (10) laying respectively at emery wheel both sides,The work portion of each diamond pen (10) is designed to the 20 ° of angles matched with emery wheel (11) work portion,Each diamond pen (10) is connected with corresponding thimble (9),The needle point of thimble (9) offsets with the model (1) that oblique angle is 20 °,The drive end of thimble is connected with slide block (3),Slide block (3) moves up and down in the gathering sill (4) of guide rail (2),It is separately installed with right phaseswitch (5) in the side of gathering sill (4)、Left phaseswitch (6)、Right phase place contact block (7) and left phase place contact block (8),Guide rail (2) is with scale,The stroke of slide block (3) is determined by the thickness of emery wheel (11),Slide block (3) moves up and down along gathering sill (4) back and forth according to required stroke,Two described phase place contact blocks and two phaseswitch are reversely installed,To receive corresponding signal,When slide block (3) encounters left phase place contact block (8), left phaseswitch (6) feeds back signal to right phaseswitch (5),Right phaseswitch (5) controls right phase place contact block (7),Slide block (3) accepts the instruction of right phase place contact block (7) in return course and moves;Along with moving back and forth of slide block (3), thimble (9) moves up and down also along 20 ° of hypotenuses of model, and then drives diamond pen (10) to complete the finishing to emery wheel.
Device the most according to claim 3, it is characterized in that directive CCD is blocked a part as the directional light of sensor, therefore the signal that CCD exports as sensor is jagged, the length on each limit of breach has relation one to one with the size of emery wheel or worm screw, utilize computer data acquiring to obtain the CCD pixel number that breach is corresponding with processing system, and then realize abrasion of grinding wheel detection and accurately to cutter.
Device the most according to claim 3, it is characterized in that the fluorescent tube of launching of described RF transmitter (15) is designed to a circle circle to the shape of external diffusion, which group tip diameter according to worm screw selects launch fluorescent tube, makes infrared ray just fall on the outside circle of worm screw and sensed device (16) receives;When length feed to emery wheel tooth top overlaps with worm screw tooth top cylindrical, the sensing of the photoconductive resistance in induction apparatus (16) light change and amplifies signal and feeds back to digital control system (17), and emery wheel time-out, digital control system (17) remembers this lengthwise position.
CN201410354513.2A 2014-07-23 2014-07-23 The profile error control method of worm grinder and device CN104128884B (en)

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