Temperature of fluid of cutting of treatment of simple analysis deep aperture is online monitor reach control

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  • source:GEOFF CNC Machining
Deep aperture is to show long way is compared normally be more than the aperture of 5. Because be versed in in deep Kong Jia area of the cutting in the process is in condition of half closed circuit to fall, cutting area can produce a large number of heat in metal cutting and very difficult be lost, but operate personnel cannot the accurate, seasonable real time condition that learns deep aperture to machine a process, the online monitoring that so deep aperture machines considers to will have important sense. If cannot heat in metal cutting seasonable eduction, the temperature of area of cutting of deep aperture treatment will extremely fast rise. Lift as temperature, broach and workpiece can produce heat to be out of shape, bring about cutting tool to go slant the function of; broach drops, cutting ability also is reduced quickly subsequently, broach service life is reduced considerably. In process of deep aperture treatment, use the method that cutting fluid gives cutting tropics normally. In deep aperture treatment, cutting fluid is holding the position of the main function such as lubricant, refrigeration and platoon bits, whether normal very big level gets course of deep aperture treatment the influence of cutting fluid condition. In project practice, the cutting rate that different workpiece and aperture use is met somewhat difference. The article is not changing rotate speed and broach feed as far as possible, not on the foundation of loss treatment efficiency, the method that uses flow of control cutting fluid achieves the result that dominates cutting area temperature. The article designed a plant that reduces broach temperature automatically, the real time that uses PT100 temperature module to realize data is collected, and the size of basis temperature signal, control cutting fluid flow through PLC self-correcting, finish deep Kong Zuan to cut temperature automata of the system, realized a hand to use the switch with automatic mode. This device has an operation simple, stability is mixed high suitable scope is wide wait for a characteristic. The online monitoring plan that 1 deep aperture machines a system to monitor plan deep Kong Zuan to cut a system is built go up in foundation of signal of different operating mode, basically have: Lukewarm signal of oil of fluid of signal of signal of drill pipe torque, drill pipe vibration, cutting. In process of deep aperture treatment if give current situation condition, criterion to it corresponding signal feature parameter can produce change. The article basically is the signal that monitor with cutting fluid temperature, achieve the goal that controls cutting fluid flow finally. In broach, workpiece and the much heat energy that in cutting bits, collect, the generation in cutting process is machined in deep aperture. What cutting is sure to bring about temperature is quick elevatory then the damage and affects broach cutting performance of aggravate cutting tool, such meetings make be lifted by surface roughness of treatment workpiece surface, quality is reduced considerably, also will lower the service life of cutting tool greatly at the same time, cause pecuniary loss, produce serious effect to production. Because deep aperture treatment has,fasten at common machining, former be in close partly below condition, the quantity of heat that produces because of this cutting is easier assemble, send out hard, must give many cutting tropics by cutting fluid in order to drop the temperature of cutting area. If in cutting process broach appears more serious mar or wear away, criterion cutting tool, workpiece and cut the attrition between bits to will increase greatly, cutting area temperature rises quickly, the temperature of cutting fluid also will lift subsequently. Accordingly we can discover, be worn away by the quality of treatment workpiece, cutting tool and efficiency of deep aperture cutting with cutting fluid having between temperature impartible cut fundamental connection. So, research of online to the real time of cutting fluid temperature monitoring will conduce to the knowledge with operation accurate personnel deep Kong Zuan cuts an environment and be being made in time adjust. Quicken deep Kong Jia to be versed in the whole side of automation technology develops then. Of temperature of 2 cutting tool detect automatically with control program (the treatment principle of 1) deep Kong Zuan pursues the 1 working status that goes up in common lathe for BTA deep Kong Zuan. Include main shaft box, center to wear, award oil implement, box of drill pipe, feed, filter device, hydraulic pump, gasoline tank. The center that attends by lathe above all wears clamp to be machined workpiece, when bore is machined, workpiece drives next whirl in main shaft by the collet clamp of main shaft, drill pipe drives feed to move by feed box. Installed on machine tool workbench award oil implement, pass O sealing ring and workpiece left end panel sealed join. The hydraulic pump of cutting fluid classics that pressurization crosses is carried by gasoline tank award oil implement, flow into cutting area from the aperture between drill pipe external diameter and hole wall next, undertake lubricant, refrigeration to cutting area, will contain the cutting fluid that cuts bits to push drill pipe lumen to go out to filter side by side reversely at the same time device, the cutting current oil sump tank after filtering, circulate ceaselessly so. The emulsion chroma that cutting fluid uses can choose F =0 of rotate speed N=500-800r/min, feed for 5%; cutting dosage.

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08mm/r. The mobile center bearing that installs on machine tool slideway is OK the aleatoric position of bearing drill pipe, the drill pipe that because drill pipe passes to grow and be brought about,can ease as far as possible so is out of shape, increase the stability of drill pipe thereby. 1.

Main shaft box 2.

Workpiece 3.

The center is worn 4.

Award oil implement 5.

Drill pipe 6.

Feed box 7.

Filter 8.

Gasoline tank 9.

Deep aperture of 1 BTA of hydraulic pump graph machines a principle (of 2) temperature sensor measure span of temperature of fluid of cutting of drilling machine of positional deep aperture not quite. The temperature of PT100 temperature sensor collects limits to be able to be in - 200 ～ + 200 ℃ . This literary grace collects cutting fluid temperature with PT100. The mouth discharging bits that puts PT100 park drill pipe according to the experiment is in, bring into contact with gets bits and cutting juice, the collection of temperature effect accuracy is tall, but consider to be carried inside here cutting fluid cut bits in great quantities, cause damage easily to PT100. Accordingly, the article places PT100 filtering the exit of device, pursue namely 1 in between filter and gasoline tank. Herein collects temperature to may have partial error, but the impact is not big. (If the graph is shown 2 times,3) controls a system, control system uses PLC control, whole control system includes: Face plate of PT100 temperature sensor, PLC, operation, transducer. When beginning the work, area of cutting of cutting current classics undertakes cooling, carry the eduction that cut bits, after passing filter plant, measure by PT100 temperature sensor cutting fluid temperature. PT100 temperature sensor will be measured so that data passes the thermal resistance module of PLC. Rotate speed of transducer control hydraulic pump has been used after PLC trade off study, control the flow of cutting fluid thereby, achieve the goal with cooling intelligence. In the meantime, PLC transmits data operation face plate, real time shows the working state that controls a system. Graph 2 temperature are measured with control setting of program of sketch map control is a hand to use control and automation. When the hand uses control, on operation face plate the setting is " the hand is moved " , answer before this first open system, it is normal to check each index. Input the temperature value of the requirement, PLC compares this temperature value and the cutting fluid temperature that collect right now, adjust hydraulic pump rotate speed, reach this numerical value till the temperature that collects. Get directly commonly when cutting shallow hole, usable hand uses pattern, drilling machine of likewise deep aperture is in overhaul or formula of hand movable mould also can be used directly when transducer is out of order. The hand is moved when starting, be finished by the corresponding pushbutton that start and illume indicator light, when stopping by stop pushbutton correspondingly to finish and extinguish indicator light. When automata, on operation face plate the setting is " automatic " , right now, the system works automatically below the control of PLC. The system has set the foundation beforehand " temperature, rotate speed " the curve is self-adjusting hydraulic pump rotate speed. Protective broach won't be lukewarm spend heat and damage, workpiece happening heat is out of shape and work be no longer in force. "Temperature, rotate speed " the curve can undertake installing on operation face plate. In process of treatment of deep aperture of 3 experiments analysis, the temperature of its cutting area is ceaseless and elevatory, lift as temperature, broach produces heat to be out of shape, quickness of broach wear-resisting function drops, cutting ability is serious and abate. Graph 3 times more exorbitant the cutting blade that microscope has machined to deep aperture has observation, visible, blade of intermediate tine cutting is mid and apparent nigrescent, the specification wears away here more serious, experiment so with cutting blade wear away degree is reference, come with this control equipment of temperature of test and verify is significant. Graph 3 microscopical below the system outside the deep Kong Jia that the wear out condition of tine, intermediate tine, center tine undertakes twice having do not have temperature control equipment is versed in contrast experiments, examine the razor blade below two kinds of circumstances wears away degree. Material of experiment razor blade is YG8, treatment material is 45 steel and titanium alloy respectively (TC4) , cutting dosage: F =0 of rotate speed N=600r/min, feed.

05mm/r. Test data sees a table 1. Express 1 cutting tool to wear away value (Mm) pursues 4 with the graph the 5 cutting tool wear out condition that control a system to process 45 steel to use and did not use temperature respectively. From the watch 1, graph 4 with the graph 5 can reach: Get when cutting 45 steel and titanium alloy, the cutting tool that did not use temperature control equipment wears away bigger, the cutting tool when processing 45 steel especially wears away relatively serious, and the difference wearing away below two kinds of circumstances when machining titanium alloy is not particularly big, because the main cutting force of titanium alloy is less than the element such as 45 steel to cause,this basically is. Pass an experiment to be able to see, the temperature control equipment that use article designs can drop the temperature of cutting area effectively, reduce cutting tool then wear away degree. (Face of the knife after the blade outside A) wears away (face of the knife after the blade in B) wears away (face of the knife after C) horizontal blade wears away pursue the cutting tool wear out condition that 4 use temperature control a system to process 45 steel (face of the knife after the blade outside A) wears away (face of the knife after the blade in B) wears away (C) : The deep aperture broach that the article is based on PLC to design drops in temperature device, set the hand is moved and automatic mode of two kinds of jobs, can measure according to the current of cutting of temperature signal automata of cutting fluid, realized deep Kong Zuan temperature of systematic cutting fluid is online monitored intelligence turns control, and software is operated go to the lavatory and easy implementation, hardware joins easily also, ask to working environment at the same time inferior, the job is stable and reliable, cover an area of an area small, apply to workshop spot to use. CNC Milling CNC Machining