1 lubrication system active status monitoring

In the lubrication system except because of the fuel oils consumption, the fuel tank oil too few causes the lubrication system for the oil insufficiency outside, the common breakdown also has the oil pump to expire, the fuel supply pipe road stops up, the current divider work not not normally, the oil leak is serious and so on. Therefore, has established the following detector set in the lubrication system, uses in to the active status implementation monitoring which lubricates pumps, avoids the engine bed in outting of gas under the condition to work, affects the engine bed performance and the service life.

The overload examination pumps in the lubrication in the power supply return route the operational g-load protection part, and takes its hot overload electronic contact the PMC system the input signal, once lubricates pumps appears the overload, the PMC system then examines and performs to process, causes the engine bed to stop moving immediately.

Oil level examination lubricating oil for 消��? after therefore the engine bed works period of time, the lubrication pumps in the fuel tank the lubricating oil to be able to gradually decrease. If operator not prompt increase, when in the fuel tank the lubricating oil arrives the lowest oil level, the oil level examination switch immediately act, and transmits this signal for the PMC system carries on processing.

The pressure examination engine bed uses progressives the type centralism lubrication system, so long as the system work is normal, each 润滑�?all can guarantee obtains lubricant which prearranges. Once lubricates pumps itself works is not normal, the expiration, or is has for the oil return route in to appear the fuel supply pipe road to stop up, situation and so on oil leak, in the system pressure can appear exceptionally. According to this characteristic, when design pumps 出口�?in the lubrication to install the pressure examination switch, and inputs this switching signal the PMC system, after each time lubricates pumps the work, in inspection system pressure, once discovered exceptionally then stops the engine bed work immediately, and produces the alarm.

2 lubrications time and lubrication number of times control

In order to must cause the engine bed movement vice- attrition to reduce, must maintain the suitable clean fluid film at the movement vice- surface, namely between the maintenance friction surface the constant forms the lubricant film for the oil. When the numerical control engine bed movement vice- need lubrication oil mass is not too many, uses continuously supplies the oil way not to be already uneconomical is unreasonable. Because excessive with is insufficient for the oil for the oil similarly is harmful, can have the attachment quantity of heat, the pollution and the waste. Therefore, the lubrication system selects regularly, the quota cyclical work method.

Centralism lubrication system itself may dispose the microprocessor, specially uses in the time which establishes the lubrication to pump stops and each time supplies the oil time, controls the lubrication to pump the gap work, designs the personnel often also to borrow this to simplify own PMC procedure.

But the engine bed when the different active status, like just electrified the initial work stage, the processing movement and because of adjusts, the examination work piece causes the engine bed suspended the movement, the engine bed to the lubricating oil demand quantity is various. In disposes the FANUC numerical control system in the engine bed, usually pumps the lubrication oil mass through the control lubrication which the work the time adjusts provides, but, the custom consideration is the lubrication system under the engine bed processing running status for the oil way, but has not taken into consideration other active statuses, like this, when the engine bed is at other active statuses, the lubrication system provides lubrication oil mass either insufficient, either excessively are many.

The engine bed guide rail needs the lubrication oil mass nearly mights with the under formula to calculate: (Length + migration travelling schedule) * width ×K. Carries out official duties in the formula to be allowed to see, the engine bed guide rail needs the lubrication oil mass concerns with this guide rail on axis motion distance. Europe and America produces the numerical control system mostly takes the basis by the travelling schedule quantity, controls the lubrication to pump the work, the gap supplies the oil, and has provided the corresponding parameter in the system, is advantageous for the engine bed manufacturer to pump through the PMC procedure to the lubrication carries on the electrical control. But in FANUC in 0i system not similar control method, in order to can in disposes FANUC 0i on the numerical control engine bed, uses approximately pumps the work for the oil way control lubrication, we improved the lubrication control section electrical design, enables the control system to pump the operating frequency and each time operating time according to the engine bed concrete working condition automatic control lubrication, suspends when the engine bed suitable reduced fuel feed, when engine bed initial work suitable increase.

Presently will lubricate the active status which will pump to divide into three kinds, separately will establish the lubrication to pump the operating time and the frequency.

Opening machine preliminary stage engine bed opening machine, the lubrication pumps instantly starts to work, continuously supplies oil period of time, this time lubricates pumps the work time T1 the normal state under to have to be longer than, in order to provides the enough lubricating oil in the short time, causes on the engine bed guide rail rapidly to form a lubricant film. The lubrication pumps the running time instruction to establish by PMC in the procedure TMRB. Is different with the TMR instruction, by the TMRB hypothesis time, the user cannot revise the adjustment at will.

Processing movement stage engine bed opening machine after, after process lost motion preheating, enters the steady work condition. Hereafter, the control system control lubrication pump house rests the work, guaranteed the engine bed guide rail can obtain, the quota lubrication regularly. The time which the lubrication pumps which each time works the time and it stops by PMC in the procedure TMR instruction to establish. The TMR hypothesis time parameter, the user may according to need the appropriate readjustment in the PMC data window.

The suspension stage work piece treats when the processing or the processing finished, the engine bed often is at the suspension active status, the lubricating oil demand quantity corresponding reduction, therefore, needs promptly to adjust the control mode, suitably lengthens the lubrication to pump the knock off the time, reduces its operating frequency, thus reduced oil quality consumption. The realization key is when the engine bed is at the suspension condition, the system how learned. FANUC in the 0i numerical control system has provided signal MVX (F102.0), MVY (F102.1), MVZ (F102.3), uses in to reflect the engine bed various axes the motion condition. If this signal condition is "0", indicates the corresponding engine bed axis static motionless, if all shifting shafts static are motionless, then indicated the engine bed this time is at the suspension active status. Therefore, so long as above all signals condition all is "0", through the design, the PMC procedure automatic change lubrication pumps works and the stand-by time. This time, the lubrication pumps time T3 which the work time T2 and stops to use the TMRB instruction hypothesis, similarly, the user may not revise these two time parameter at will.

3 lubrications alarm processing

In pressure anolmaly numerical control engine bed lubrication system for 间歇供油 work way. Therefore, in the lubrication system pressure selects the periodic inspection method, namely will pump in the lubrication each time works later to inspect. If appears the breakdown, like the oil leak, the oil pump expire, the oil duct stops up, in the lubrication system pressure can suddenly drop or elevate, this time should force the engine bed to stop immediately moving, carries on the inspection, in order to avoid situation expansion.
The oil level excessively low formerly was familiar with the processing method was "excessively is low the signal the oil level" the alarm to converge with "the pressure anolmaly" a kind, took urgently stopped the signal. Once the PMC system receives above signal, the engine bed enters the urgent stopped state immediately, simultaneously lets the servosystem power failure. But, because the oil duct stops up or the oil leak phenomenon creates "the pressure anolmaly" the situation with the lubrication system differently, if lubricates pumps in the fuel tank the oil to be insufficient, the short time as for does not affect the engine bed the performance, does not need to stand even if engine bed knock off. But, after appears this phenomenon, the control system should promptly demonstrate the corresponding information, the reminder operator prompt oil addition. If the operator has not given in the scheduled time to supplement, the system can control the engine bed to enter the suspension condition immediately. After only has the prompt military supplies lubricating oil, only then allows the operator to move the engine bed, continues work which severs. "Excessively is low the signal in view of the oil level", such processing method may avoid having the nonessential engine off, reduces the assistance process period, specially in processing large-scale mold time. When design, we "the oil level excessively will be low" the signal to converge the electricity control system "to enter for the suspension" a kind of signal, the use "the reminder - warning - suspension, the prohibition automatically will move" reports to the police the processing way. Once in fuel tank oil too few, not only in operates on the kneading board to have the red indicating lamp prompt, also simultaneously demonstrates the warning information on the screen, the reminder operator. If this signal has not vanished in the stipulation time, then lets the engine bed rapidly enter for the suspension condition, this time suspends the engine bed to carry on any automatic operation. The operator increases the enough lubricating oil after the fuel tank in, only needs according to "the circulation to start" the button, may relieve this condition, lets the engine bed continue before the suspension the processing operation.

4 conclusions

In numerical control engine bed electricity control design process, lubrication system processing if is neglected, says regarding the engine bed user, does the engine bed various parts whether regular quota obtain the lubrication, actually is the extremely important question. Should unceasingly improve, the consummation product design, reduces the engine bed to appear the breakdown the number of times, enhances the product the reliability.