Use high accuracy fiber-optic span sensor undertakes machine tool monitoring

The sensor of 4 ～ 3mm suits to be used in the machine tool treatment of high accuracy use the span that designs by research and development of Fraunhofer IPT institute to detect sensor, can be in many detect differently the precision of accept rice class that the position finishs pair of position error that be mixed by the appearance of treatment spare parts at the same time detects. This kind of technology is made in aerospace, car, printing machine instrument is made and very good application can receive in optical equipment production sphere. This kind detects the technology agrees with those traditions detect because the solution installs use space finite, and the tradition detects the technology cannot be satisfied detect the circumstance of precision. The inspection frequency of this kind of sensor is very tall, detect the error is less than high accuracy detector apparently, can realize machine tool and equipment to be in super- inside exact form limits online detect, the monitoring of the monitoring that if the machine tool moves,axis and slideway move and transmission shaft. This kind of testing system of Fraunhofer institute research and development is based on shortwave laser to interfere a principle, basically comprise by component of two coherence laser (graph 1) . Component of the first among them completely fiber-optic technology that is pure optics (SLD1) , the 2nd is Michelson laser interference implement (SLD2) . Range finding leaves the check of this kind of testing instrument to be 500 μ M about, definition amounts to 1nm detect limits makes an appointment with 80 μ M. This system of research and development of institute of graph 1 Fraunhofer IPT is the working principle that is based on laser short be concerned with, its are main the component is unit of component of two coherence laser, component of the first among them completely fiber-optic technology that is pure optics (SLD1) , the 2nd is Michelson laser interference implement (SLD2) cable of wave of consumed of this kind of sensor (LWL) join, the external diameter dimension of cable is 0.

4 ～ 3mm. Taller to rigid requirement sensor, can install its in CFK or nickel titanium in the metallic carapace of composite material. Finally, interfere two kinds of signal in Michelson implement in undertake decipher. Miniature sensor and detect unit volume mood is together and detect the final judge device of the result need not be installed detecting the spot. Additional, the structure of this kind of testing system still allows to detect in use in judge unit many detect sensor. Benefit consumed fine transfer switch is OK and quick undertake switch between each sensor conveniently. Interfere in Michelson from this implement medium and gotten grating picture will use camera of type of CCD charge coupling to undertake decipher, benefit undertakes with the computer next data processing. Detect span and detect limits depends on sensor signal (focal length) the angle with refraction lens and its and laser shoot bundle of span between. Compare with other testing system photographs, the discriminative archives that the advantage of this kind of testing system depends on it not was similar to linear adjuster or and so on of the generator that suppress report mechanical component. The characteristic decipher of camera of type of NextpageCCD charge coupling enters an examination when the object that be measured in limits hind, will produce to interfere smooth example by the inherent characteristic of decipher of camera of type of CCD charge coupling. The transverse position that uses interference signal is in CCD chip to be being measured the span of the object undertakes compensating, become conversion of span regulated quantity the check the number resembling element of image. The company of Fionec finite liability that the system of a complete set of that matchs instrument and sensor to form by data studies to be in Achen to build by Fraunhofer IPT has production and sale. In this system, the circularity of gyral swing tower component and circle are jumpy to detected precision, noise and whole system wear away having main effect, result from in answering to machine a process in production, their wrong signal gives in time identify and eliminate, include the component with main machine tool among them, be like take-off, rotor, main shaft, roller (the roller that prop up and working roller) with oriented roller. Sensor should be installed on these swing tower spare partses, so that collect important manufacturing process data, take necessary step in time. Detect in this kind in the method, rotate when component works, outer strength effect issues what arise possibly to be out of shape (can be in many different test point are right rotate component is in what outside force action falls to be out of shape undertake detecting) , in the whirl that in producing working course, appears component surface wears away and appearance wears away (come off, disintegrate of extruding of conglutinate, surface and attrition) waiting can be important be detected parameter. This kind of technology can apply Yu Ruyin to brush a domain directly in, in this domain, roller kind the circularity of component and round jumpy error are having immediate effect to the quality of presswork. Another can use this kind to detect directly technical domain is roller production company, because opposite needs in this domain,produce light to guide the micromechanism of surface of plastic film roller undertakes detecting. Below this kind of circumstance, the span that benefit consumed fine conducts detects it is very appropriate that sensor undertakes detecting in many test point, the space that because these detecting,the installation of sensor needs is very little (miniature sensor) , adoption dispute contact detects, won't right the surface that be measured is brought damage, in sensor and there are interaction and influence between the object that be measured. Detect to can demonstrate this to plant applied circumstance of the technology, be designed technically and made a testing stand (graph 2) . The structure of this testing stand is very complex, to its tigidity and stability are having very high demand. During the Control 2009 fair that holds in 2009 year Stuttgart, fraunhofer IPT institute revealed a such testing stand: Use different smooth fiber sensor to undertake manufacturing the monitoring of the process. The whirl that the plan differs 2 pairs is symmetrical the object undertakes what this testing stand uses detecting the check of horizontal lathe bed of monitoring checks check stage is structure of horizontal lathe bed, the main shaft in lathe bed by electromotor drive, to can rotate to what differ the system undertakes detecting, two side deployed lathe bed the declutching device that join uses. Detecting element and detect the synchronism of data judge unit, and the synchronism of main shaft whirligig is to pass coder to come true. The setting of decoder makes it can turn according to coming back the TTL with the size corresponding generation of angle sparks signal, spark these signal sends judge unit in, undertake controlling to the working process of camera. The data information that camera place gathers can pass analytic software to undertake handling, every two spark corresponding corner is equivalent to between signal 0.

1. As detect sensor, the fiber-optic and optical sensor that 3 kinds can be used with fiber-optic switch coupling can be offerred choose. Use this kind of fiber-optic switch, the system can be in fiber-optic and detect change between sensor, realize the synchronism of test point position and whirligig thereby. Each sensor uses demarcate face to unite undertake demarcate, make its detect thereby the value is worth for fixed reflex. The special sensor that is used at surface roughness to detect is symmetrical to every circumgyrate of body detect, must include error of prejudicial to its, appearance, weaveform to spend with surface roughness detect. Be measured to can be opposite the object reachs convincing conclusion, need to detecting data undertakes filtering, want to have technical research to every eigenvalue, can realize the alone in producing a course feature that is worth to detecting to undertake monitoring so. Be opposite to come true detect of data filter, used a variety of filter, include low a filter, belt is connected filter and connect filter high, the data information that because detect,arrives comes from different frequency paragraph. The part that in using a blame to be opposite, installs can undertake modulation to signal, the frequency of the frequency of modulation signal and gig body is same. Below this kind of circumstance, the circularity state of circular spare parts came out with respect to unusual appearance legibility. This kind of inspection frequency by low connect filter to undertake filtering, weaveform of appearance sum of errors spends an error to use take a filter to undertake filtering, and surface roughness is to use connect filter high to undertake filtering. The signal that the course filters (appearance error, weaveform is spent and surface roughness) metropolis undertake with 11562 standards according to DIN/ISO 12181-2 standard eigenvalue standardizes processing, chase after through what method of this kind of monitoring can achieve component status narrate. To improve this system further but compositive sex, fraunhofer IPT institute plans the diameter of farther contractible sensor, plan production of research and development to be used technically at the sensor that surface roughness detects. Through carrying the special processing of the ministry to sensor, return what can realize different point of view to detect. Detect in this kind of span in, also can use other and fiber-optic sensor, be like fiber-optic Bragg grating (FBG) sensor, in order to achieve pair of power, expand and of temperature add detect. This kind detects the technique is already successful apply at the market, those who appear in industrial business is daily in detecting. This kind detects the monitoring that the technology still can apply at building condition, wind-force generates electricity the monitoring of equipment lamina condition, monitoring of conduit and oil field equipment. CNC Milling CNC Machining