CN202684206U - Saw log feeding system with constant sawing variable feed speed - Google Patents
Saw log feeding system with constant sawing variable feed speed Download PDFInfo
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- CN202684206U CN202684206U CN2012202241494U CN201220224149U CN202684206U CN 202684206 U CN202684206 U CN 202684206U CN 2012202241494 U CN2012202241494 U CN 2012202241494U CN 201220224149 U CN201220224149 U CN 201220224149U CN 202684206 U CN202684206 U CN 202684206U
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Abstract
The utility model discloses a saw log feeding system with a constant sawing variable feed speed. The system is composed of a saw log, a hydraulic system and a control system; the saw log is arranged on a sawing machine through double upright posts; an oil cylinder drives the saw log to move up and down along the upright posts; the control system is a layering multi-machine cooperative hardware system framework; real-time/non-real-time tasks are distributed to each processing unit according to the class; a hard logic gate circuit helps to improve the reliability of the system; and the system carries out feedforward control based on saw cutting width of a workpiece over variable feed speed by combining with measured saw log displacement and material hardness of the workpiece according to the cross section type of the workpiece and a parameter selected by an operator. According to the saw log feeding system, the closed loop feedback feed control of constant sawing force is carried out according to an oil pressure value of the oil cylinder collected by a pressure sensor; the quality of a saw cutting workpiece and the work efficiency of the sawing machine are improved; the blade consumption is reduced, and the solution of the saw log feeding control system is more perfect by customized cutting-in and cutting-out feeding and fast ascending resetting control strategy of the saw log.
Description
Technical field
The utility model relates to the saw frame feed system of horizontal metal band sawing machine, relates in particular to the saw frame feed system that a kind of permanent sawing force becomes feed speed.
Background technology
Relatively car, mill, boring, mill, insert, draw, the comprehensive lasting improvement design of the metal working machine tool such as forging, sawing machine does not but obtain due attention for a long time, is identified on the contrary to be a kind of simple cutting die metal-working plant.At present, the double constraints of environment and resource is to pay the utmost attention to two hang-ups of solution when developing the economy; Why hot investment casting and precision forging can emerge rapidly, have benefited from the outstanding representation on " two hang-ups "--resources conservation and environmental friendliness on the certain degree: reduced the consumption of raw material metal, the minimizing of waste material has reduced again the pressure to environment.The same period, it is that band sawing machine has progressively replaced traditional hacksawing machine, circular sawing machine that the maximum of sawing machine industry changes, and has obtained the ascendancy in sawing machine market, has reached 80 ~ 90% of sawing machine total amount such as the band sawing machine of the U.S..In the sawing process, band sawing machine is bow type sawing machine, circular sawing machine economical with materials 56%, 87.5% respectively; Because the sawing cross section quality of band sawing machine processing work is better than bow type sawing machine and circular sawing machine, thereby reduced follow-up processing capacity, improved production efficiency.Along with the future development of Modern Manufacturing Industry towards efficient, high accuracy and low consumption, people's re-examine location, the role and importance of sawing machine in machining: sawing is defined as the starting point of metal cutting processing, is integral link important in the part process; The sawing machine industry of China has obvious regional feature, and the Jinyun county, Zhejiang province county occupies the band sawing machine production of the whole nation 70% or more, 14,300,000,000 yuan of this county band sawing machine in 2010 and characteristic mechanized equipment realization industrial output values.
Domestic sawing machine makes great progress, but compares with the like product of developed country, no matter is that technical indicator or added value all exist larger gap.The reason of three aspects: causes China sawing machine sparetime university and not strong present situation: at first, whole scientific and technological strength is still not as the people; Secondly, the optic zone sawing machine has hindered the technological progress of sawing machine for the outmoded theory of " simply cutting off equipment "; At last, the traditional concept that " rather is chicken head, does not do oxtail " haunts--the efficient sawing machine industry cluster based on professionally more competent matching system is had difficult labour for a long time--, and each sawing machine producer makes earnest efforts main frame, each other " clone " low-price competition.The weak link of domestic sawing machine is pointed out as " Machine Tool Industry " 12 " development plan ": at " digital control system and functional part ".The main flow digital control system of domestic band sawing machine is typical electrohydraulic control system, in other words, is the system that is carried out by electrical control, hydraulic-driven.What the electrical control of low and middle-grade band sawing machines was adopted is cheap switch, relay assembly, and hydraulic system is limited to the switching value device; The PLC controller is generally adopted in the electrical control of domestic medium and high-grade band sawing machine, and hydraulic system is no lack of analog quantity device (such as proportioning valve).At first sight, the automation level of the domestic band sawing machine of medium and high-grade still can--sawing process is full-automatic; But the sawing production efficiency of domestic band sawing machine is not as good as external colleague, and the consumption of saw blade is again far above external colleague, really undisputable fact.From doing greatly to running business into strong one necessary domestic " digital control system and the functional part " that improves extensive style; Base oneself upon the mechanism of web for sawing metal, Development of New Generation " digital control system and functional part " is filled the short slab of domestic band sawing machine one by one; Fortunately, under the joint efforts of academia and business circles, the related theoretical problems of band sawing machine makes a breakthrough and builds consensus, and next step effort can focus on technology realization and the engineering of theoretical research result and use.
Saw blade motion is horizontal sawing campaign and the synthetic compound motion of vertical feed campaign; Can determine best saw cutting speed value according to the hardness of processing work material.
The speed value of feed motion is not only relevant with the hardness of workpiece material, and should make dynamic adjustment with the sawing wide variety of workpiece; Permanent sawing force help to prolong saw blade service life, reduce and collapse tooth, broken belt accident rate, and the maximization of sawing machine production efficiency; Under the prior art condition, there is no reliable, the practical and suitable measure of price of direct collection sawing force.
The worker advances, the sawing worker advances and cut out the worker advances to form by cutting in workpiece sawing feeding (being called for short the worker advances), and the operating mode when saw blade is cut and cut out is different from the sawing worker and advances.Although it is total insignificant in consuming time that incision and cutting out is advanced the worker, be a contact be transitioned into abundant contact (the cutting number is greater than 3 ~ 4) on the contrary dynamic process or; The saw blade especially suffered impulsive force of crown is often excessive and present uncertain randomness, is the high-risk period of playing tooth, crown wearing and tearing; As everyone knows, the aircraft industry accident occur in the landing stage of taking off more than 80%, this " playing tooth, crown wearing and tearing " accident to band sawing machine is what similar? Therefore, the special counter-measure of design is necessary; In view of the temporal properties of transient process, the focus of " counter-measure " is real-time and validity (avoid beating tooth and slow down the crown wearing and tearing), and its impact on sawing machine production efficiency needn't consider fully, cut after all the worker advance, cut out the worker advances consuming time too little very little.
For improving the production efficiency of sawing machine, when the workpiece sawing is finished, require saw frame fast rise under the driving of oil cylinder to reset, prepare to enter next operation cycle; A large amount of reports of sawing machine user and the test result of sawing machine production firm show: there is carelessness in the design of existing sawing machine--the saw frame fast rise again in the past, sawing material cross section can produce with oblique minute tooth of saw blade the violent friction of moment; Therefore, this carelessness demands urgently correcting.
Up to now, the more representational intellectual property Summary on research results of band sawing machine is as follows:
Patent of invention " Intelligent band sawing machine " (application number 201010562127.4), proposition consists of the saw blade tension checkout gear by saw blade hydraulic tensioning cylinder pressure sensor and modulus AD converting unit, consists of the electro-hydraulic servo feed arrangement by saw frame feeding hydrocylinder displacement transducer etc.; The Cutting power that bands for band is born in whole sawing process is constant.
Patent of invention " constant-power sawing control device of band sawing machine " (application number 201010530562.9), give chapter and verse the sawing load variation and adjust the sawing feed speed, the feeding displacement transducer is arranged in the feeding hydrocylinder of band sawing machine, and the tensioning displacement transducer is arranged in the hydraulic tensioning cylinder of band sawing machine; Realized bands for band is subject to the non-contact detecting of sawing load.
Above-mentioned benefiting our pursuits, proposed when the sectional dimension of workpiece and shape change, adjust the thinking that feed speed is carried out permanent power sawing, certain reference value is arranged, still have limitation but explore achievement: the saw frame feed control system is not considered to cut the worker and is advanced and cut out the special operation condition that the worker advances; Saw frame needed fast rise to reset after workpiece was finished sawing, and it is vacant that sawing material cross section surface and serrated face can produce violent friction, the counter-measure of moment; In view of the reliable and suitable method of price that there is no at present direct collection sawing force, above-mentioned researcher turns to the detection saw blade tension, but there is no one-to-one relationship between saw blade tension and the sawing force, have inherent shortcoming though namely detect the feasible sawing force that draws of deriving of the method for saw blade tension itself; Therefore, be necessary to do deep research and innovation on existing achievement in research basis.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, provides a kind of permanent sawing force to become the saw frame feed system of feed speed.
The saw frame feed system that permanent sawing force becomes feed speed comprises saw frame, hydraulic system, control system; Saw frame comprises that principal and subordinate wheel, distance measuring sensor, saw blade, workpiece sensing bar, Leeb Hardness Tester, directive slide track, travel switch, saw frame fixed mount, driving wheel drive variable-frequency motor, driven pulley tensioning hydro-cylinder and be used for the grating scale that feed length detects; Be provided with principal and subordinate wheel, distance measuring sensor, Leeb Hardness Tester, directive slide track, driving wheel driving variable-frequency motor and driven pulley tensioning hydro-cylinder at the saw frame fixed mount, saw blade links to each other with principal and subordinate wheel, and driving wheel links to each other with driving wheel driving variable-frequency motor, driven pulley links to each other with the driven pulley tensioning hydro-cylinder; The workpiece sensing bar cooperates installation with directive slide track; Travel switch is installed in the surface of directive slide track; Leeb Hardness Tester is fixedly mounted on the lower end of workpiece sensing bar, the Leeb Hardness Tester lower surface parallel with workpiece sensing bar lower surface and on to move spacing be 1mm, grating scale is installed on the stock support; Hydraulic system comprises oil cylinder, pressure sensor, sequence valve, solenoid directional control valve, proportional flow control valve, check valve, oil pump, filter and fuel tank; The rod chamber mouth of oil cylinder links to each other with the A mouth of solenoid directional control valve, the rodless cavity mouth of oil cylinder links to each other with sequence valve input port, pressure sensor respectively, the delivery outlet of sequence valve links to each other with the B mouth of solenoid directional control valve, the input port of check valve links to each other with the delivery outlet of oil pump, the delivery outlet of check valve links to each other with the P mouth of solenoid directional control valve, the input port of proportional flow control valve links to each other with the T mouth of solenoid directional control valve, the input port links to each other with fuel tank, and fuel tank is connected to the input port of oil pump by filter; Control system adopts the layering hardware configuration of upper and lower computer, both carry out information interaction by the RS232 interface: the slave computer control system comprises MCU and the CPLD that is connected, MCU links to each other with the frequency converter of host computer touch LCD screen, Leeb Hardness Tester, distance measuring sensor, pressure sensor, driving wheel driving variable-frequency motor respectively, CPLD links to each other with sequence valve, solenoid directional control valve, check valve, oil pump, grating scale and travel switch respectively by photoelectrical coupler, and CPLD links to each other with proportional flow control valve with proportional valve amplifier by digital to analog converter.
The utility model is compared with background technology, and the beneficial effect that has is:
The hardware platform of saw frame feeding control adopts the upper and lower computer hierarchy, and slave computer is based on the machine collaboration framework of MCU+CPLD; The layered cooperative system makes in real time/and un-real time job can manage reasonable distribution between the unit throughout, and the hard logic gate circuit has then promoted the reliability of system.The FEEDFORWARD CONTROL that feed speed becomes with the sawing width has been alleviated the interference that the sudden change of sawing width produces greatly, has improved sawing workpieces quality and sawing machine work efficiency, has reduced the saw blade consumption; Pressure sensor is uploaded the oil cylinder oil pressure value, implements the closed loop feedback feeding control of permanent sawing force; The sawing machine sawing adopt feedforward+the feedback complex control program is succinctly effective.Customized incision worker advances, cuts out the worker and advances the control strategy that resets with the saw frame fast rise, makes the solution of saw frame feed control system more perfect.
Description of drawings
Fig. 1 is the saw frame feeding system structure figure that permanent sawing force becomes feed speed;
Fig. 2 is the saw frame feeding hydraulic scheme that permanent sawing force becomes feed speed;
Fig. 3 is the auxiliary Sawing Process flow chart of horizontal metal band sawing machine horizontal direction;
Fig. 4 is the head saw cutting process flow chart of horizontal metal band sawing machine vertical direction;
Fig. 5 is oblique minute tooth schematic diagram of bimetal saw blade sawtooth;
Fig. 6 is the Leeb Hardness Tester structure principle chart;
Fig. 7 is the hardware block diagram of saw frame feed control system;
Fig. 8 is the hardware block diagram of slave computer control system;
Fig. 9 is the surface chart that workpiece cross section type and parameter are selected;
Figure 10 is the control system theory diagram of saw frame feeding;
Figure 11 is the schematic diagram that concerns of saw frame (bar) position and round piece width;
Figure 12 is the SAWING CONTROL flow chart of horizontal metal band sawing machine.
The specific embodiment
As shown in Figure 1, 2, the saw frame feed system of permanent sawing force change feed speed comprises saw frame, hydraulic system, control system; Saw frame comprises that principal and subordinate wheel 1, distance measuring sensor 2, saw blade 3, workpiece sensing bar 4, Leeb Hardness Tester 5, directive slide track 6, travel switch 7, saw frame fixed mount 25, driving wheel drive variable-frequency motor 21, driven pulley tensioning hydro-cylinder 22 and be used for the grating scale 23 that feed length detects; Be provided with principal and subordinate wheel 1, distance measuring sensor 2, Leeb Hardness Tester 5, directive slide track 6, driving wheel driving variable-frequency motor 21 and driven pulley tensioning hydro-cylinder 22 at saw frame fixed mount 25, saw blade 3 links to each other with principal and subordinate wheel 1, and driving wheel links to each other with driving wheel driving variable-frequency motor 21, driven pulley links to each other with driven pulley tensioning hydro-cylinder 22; Workpiece sensing bar 4 cooperates installation with directive slide track 6; Travel switch 7 is installed in the surface of directive slide track 6; Leeb Hardness Tester 5 is fixedly mounted on the lower end of workpiece sensing bar 4, Leeb Hardness Tester 5 lower surfaces parallel with workpiece sensing bar 4 lower surfaces and on to move spacing be 1mm, grating scale 23 is installed on the stock support (among the figure mark); Hydraulic system comprises oil cylinder 12, pressure sensor 13, sequence valve 14, solenoid directional control valve 15, proportional flow control valve 16, check valve 17, oil pump 18, filter 19 and fuel tank 20; The rod chamber mouth of oil cylinder 12 links to each other with the A mouth of solenoid directional control valve 15, the rodless cavity mouth of oil cylinder 12 links to each other with sequence valve 14 input ports, pressure sensor 13 respectively, the delivery outlet of sequence valve 14 links to each other with the B mouth of solenoid directional control valve 15, the input port of check valve 17 links to each other with the delivery outlet of oil pump 18, the delivery outlet of check valve 17 links to each other with the P mouth of solenoid directional control valve 15, the input port of proportional flow control valve 16 links to each other with the T mouth of solenoid directional control valve 15, the input port links to each other with fuel tank 20, and fuel tank 20 is connected to the input port of oil pump 18 by filter 19; Control system adopts the layering hardware configuration of upper and lower computer, both carry out information interaction by the RS232 interface: the slave computer control system comprises MCU and the CPLD that is connected, MCU links to each other with the frequency converter of host computer touch LCD screen, Leeb Hardness Tester 5, distance measuring sensor 2, pressure sensor 13, driving wheel driving variable-frequency motor 21 respectively, CPLD links to each other with sequence valve 14, solenoid directional control valve 15, check valve 17, oil pump 18, grating scale 23 and travel switch 7 respectively by photoelectrical coupler, and CPLD links to each other with proportional flow control valve 16 with proportional valve amplifier by digital to analog converter.In addition, the sawing machine parts relevant with the saw frame feed system have: two columns 8, fixedly vice 10( shows among the figure at the front vice back side behind the front vice 9, feeding of processing work), sawing machine holder 11 and processing work 24.Leeb Hardness Tester adopts the Leeb Hardness Tester AR936 of Wuhan Ge Laimo checkout equipment Co., Ltd; Proportional flow control valve is the SEH2-3/36F-P-G24 type two-way proportional flow control valve of German HAWE company, band pilot-operated type flow measurement hole, maximum stream flow 24L/min; Travel switch uses the XCKP-2110G11 type travel switch of Schneider company; Pressure sensor adopts the 511OEM pressure transmitter of Switzerland rich Bagong department, and grating scale adopts the WTB5-0600MM of Guangdong Wanhao Fine Instrument Co., Ltd.
Saw frame is installed on the sawing machine, does moving up and down of vertical direction along column by two columns, and two columns play the guiding role in the saw frame motion; Cylinder rod links to each other with saw frame, and the driving force of saw frame movement in vertical direction is provided; Principal and subordinate wheel is installed on the saw frame, and saw blade is by connecting principal and subordinate wheel around mode outward, adjusts gap between driven pulley and the saw blade by the pressure of regulating the driven pulley tensioning hydro-cylinder, thereby regulates the frictional force between saw blade and the principal and subordinate wheel; Driving wheel drives variable-frequency motor and provides power for driving wheel, by the frictional force between saw blade and principal and subordinate wheel, realizes the horizontal sawing of saw blade.The distance measuring sensor that detects the saw blade sawing degree of depth (saw frame position) is fixedly mounted on the saw frame, rises or descends with saw frame; Directive slide track is fixedly mounted on the saw frame, and the workpiece sensing bar cooperates installation with directive slide track, and directive slide track provides guiding to the slip of workpiece sensing bar.Travel switch is installed in the surface of directive slide track, and the push rod of travel switch is being pressed in the upper surface of workpiece sensing bar, and namely the push rod of stroke switch is in impaction state.Leeb Hardness Tester is fixedly mounted on the lower end of workpiece sensing bar, its lower surface parallel with workpiece sensing bar lower surface and on move spacing 1mm and fit; When the workpiece sensing bar touches workpiece, the lower surface of Leeb Hardness Tester also just with workpiece 1mm apart, guaranteed scleroscopic accuracy of detection.Grating scale is installed on the stock support (not marking among the figure), vice feeding or material returned position after detecting.
The operation principle of saw frame feeding hydraulic system is as follows: when the coil YA1 of solenoid directional control valve gets when electric, solenoid directional control valve is operated in left position, the rodless cavity that the P of hydraulic oil process check valve, proportional flow control valve and solenoid directional control valve under the driving of oil pump, B mouth arrive oil cylinder; The oil of rod chamber A, T mouth through solenoid directional control valve under the piston extruding of oil cylinder flows in the fuel tank simultaneously, and under the effect of rodless cavity oil pressure, hydraulic stem promotes saw frame and rises; By the valve port size of regulating proportional flow control valve, change flows to oil cylinder rodless cavity from oil cylinder hydraulic fluid flow rate size, realize the adjustment of the saw frame rate of climb.When the coil YA2 of solenoid directional control valve gets when electric, solenoid directional control valve is operated in right position, and piston rod drives saw frame and descends under the effect of rod chamber oil pressure, and the valve port size of change proportional flow control valve can be controlled the saw frame decrease speed; Sequence valve plays the balanced valve effect, prevents from causing decline because of the deadweight of saw frame itself.
Shown in Fig. 3,4, host computer touch LCD screen in control system is preset with various workpieces cross section type and parameter, shape of cross section according to sawing workpieces is selected and setting parameter at the touch LCD screen, or set up self-defining workpiece cross section type and parameter, input characterizes the relevant parameter of workpiece cross section shape, inputs other sawing parameters--such as sawing force, sawing workpieces length etc.; Press the automatic sawing, cutting flow process that starts button, enters sawing machine, the sawing flow process can be divided into by the direction of motion: the auxiliary sawing flow process of horizontal direction and the head saw of vertical direction are cut flow process.The operation that the auxiliary sawing flow process of horizontal direction relates to has: rear vice advances according to the sawing workpieces length feeding of setting, and vice unclamped after front vice clamped, a rear vice slow astern Workpiece length, front and back vice clamp simultaneously.The head saw of vertical direction is cut the operation that flow process relates to be had: saw frame is fast-descending under the driving of oil cylinder; The incision worker advances, the sawing worker advances and cut out the worker advances; After the sawing of vertical direction is finished, again enter another operation--the sawing material slow astern small distance of auxiliary Sawing Process flow process, then saw frame fast rise under the driving of oil cylinder resets; At last, front vice unclamps, begins next operation cycle.
The saw frame feeding method that permanent sawing force becomes feed speed into: sawing begins, control system control saw frame fast-descending, after workpiece sensing bar 4 detects workpiece, the hardness that control system drives 5 pairs of workpiece of Leeb Hardness Tester detects, and Leeb Hardness Tester 5 test values are uploaded among the MCU of control system slave computer; The material hardness value that the MCU basis reads, and in conjunction with metal material saw cutting speed and feeding scale that the band sawing machine industry is recommended, determine the saw blade saw cutting speed; When the worker of control system enforcement sawing advances operation, the sawing worker advances the position measurements that control system in the process reads distance measuring sensor 2 in real time, the cross section type of selecting according to the user and calculation of parameter go out saw frame position and workpiece cross section that distance measuring sensor 2 detects, are the relation table of sawing workpieces width, and set up saw frame position, saw frame amount of feeding function with reference to metal material saw cutting speed and feeding scale that the band sawing machine industry is recommended, obtain saw frame feed speed value, regulate the valve port opening of proportional flow control valve 16, implement to become the FEEDFORWARD CONTROL of feed speed saw frame feeding; Control system reads the sawing force value that pressure sensor is uploaded in real time, compare with given sawing force, again regulate the valve port opening of proportional flow control valve 16, implement the closed loop feedback feeding control of permanent sawing force, reach the compound control purpose of saw frame feeding of feedforward, feedback; Advance in the operation the saw frame worker, advance, cut out the subprocess that the worker advances for the incision worker, the special operation condition of tooth, wearing and tearing easily occurs to beat in the sawtooth of saw blade, when the incision worker advances and cuts out the worker and advance, control system shields the output of permanent sawing force feedback feeding control, and the open loop of the saw cutting speed of saw blade is reduced by half, hang down feed speed is controlled; When the workpiece sawing is finished, the technological requirement that resets according to the saw frame fast rise, and avoid the friction between saw blade and sawed-off to cause wearing and tearing, before carrying out the saw frame fast rise and resetting, behind the sawing material slow astern small distance, the saw frame fast rise resets;
As shown in Figure 5, the bi-metal bandsaw blades sawtooth arrangement that behind minute tooth, tilts according to certain rules; Modal is oblique minute tooth pattern: complete necking cutter bit of one group of formation of three teeth, a tooth is left tiltedly, a tooth is right tiltedly, commutating tooth is positioned at middle.After sawing was complete, the surface of sawing material cross section was more coarse; Before the fast rise of saw frame resets backhaul, make first rear lock-filters clamp clamping of workpieces retreat 1mm, eliminate the violent friction of oblique minute tooth and the sawing material cross section of saw blade in the backhaul of saw frame fast rise, the service life of having improved saw blade.Must be pointed out, the related workpiece sawing feeding operation of aforementioned head saw cutting process flow process (being called for short the worker advances) can be subdivided into that the incision worker advances, the sawing worker advances and cut out the worker advances 3 sub-operations, the saw blade incision operating mode when cutting out has its particularity--sawtooth is incomplete with contacting of workpiece, from a contact be transitioned into abundant contact (the cutting number is greater than 3 ~ 4) otherwise or; Theoretical according to sawing, the sawtooth when cutting and cutting out the especially suffered impulsive force of crown is often excessive and present uncertain randomness, causes and plays tooth, saw blade wearing and tearing; Therefore, correct control strategy is: when saw blade is cut and cut out, take the circumstances into consideration to reduce the saw cutting speed of saw blade, simultaneously the closed loop feedback feeding control Qie Change of permanent sawing force is extremely hanged down the open loop control of feed speed.
As shown in Figure 6, the detection principle of Leeb Hardness Tester is to impact specimen surface with the impact body with certain mass under the effect of regulation test force, measure impact body apart from impact velocity and the rebound speed at specimen surface 1mm place, utilize electromagnetic principle to detect velocity voltage.The lee ' hardness value recently characterizes with impact body rebound speed and impact velocity.AR936 type Leeb Hardness Tester is impacted assembly and is comprised coil, impact body, support ring by usb data line 5-1, release-push 5-2, loading cover 5-3, conduit 5-4, impact assembly 5-5() consist of.The Leeb Hardness Tester test process: Leeb Hardness Tester be installed in workpiece sensing bar lower surface parallel and on move the 1mm place, the support ring of Leeb Hardness Tester is fitted on the surface of workpiece, after board is stable, pressing the measurement of release-push startup Leeb Hardness Tester gets final product, after being completed, Leeb Hardness Tester is uploaded to control system by the usb data line with test result.
As shown in Figure 7, the control system hardware using upper and lower computer hierarchy of horizontal metal band sawing machine saw frame feeding, both carry out information interaction by the RS232 interface.Host computer is the embedded system of configuration touch-screen, and the user sets the sawing machine operational factor by host computer touch LCD screen, and the operational factors such as width of the relevant cross section of sawing workpieces are set, and issues operation control command and operational factor; Host computer is responsible for simultaneously showing, storing the various information that slave computer is uploaded, such as current saw cutting speed, processing dimension, is processed quantity etc.The information such as the order that slave computer controller reception host computer sends, parameter, the Sawing Process flow process of control and management sawing machine is uploaded real-time sawing duty parameter.
As shown in Figure 8, the slave computer controller hardware is a micro control system take ARM7TDMI-S as kernel based on the machine collaboration framework of MCU+CPLD: MCULPC2368, and CPLD selects the EPM1270T144C5N--of the MAXII of ALTERA company series to include 1270 logical blocks (LE), is equivalent to 980 macroelements, maximum user can use I/O 212.MCU is responsible for the information interaction of host computer, obtains operational factor and order that the user arranges, reads the information that the sensors such as pressure, range finding gather; Be responsible for the management of data processing and running status, the control of coordination sawing machine sawing process; To pass to CPLD under the control command, read the information such as real-time running state, switching value input state of CPLD; And the information such as current saw cutting speed, processing dimension are uploaded to host computer shows and storage; In a word, MCU mainly bears non real-time property task, and the work of controlling is in real time then distributed to CPLD and finished.MCU links to each other with Leeb Hardness Tester by the USB interface that carries, and reads the Leeb Hardness Tester measured value; Be connected with AC converter through the RS485 interface, the saw cutting speed of the output frequency control saw blade of AC converter is set; Read the oil cylinder oil pressure value that pressure sensor gathers by the digital-to-analogue conversion interface; Receive the distance measurement value of distance measuring sensor, with reference to given workpiece cross section type and parameter, actual sawing width when calculating the saw blade sawing workpieces (annotate: the sawing width is the function of distance measurement value), the hardness number that " actual sawing width " (distance measurement value) provides in conjunction with Leeb Hardness Tester, finally " determine feed speed ", pass through digital to analog converter, proportional amplifier connects proportional flow control valve, adjust the feed speed of saw frame according to the flow of " determining feed speed " change proportional flow control valve, implement the FEEDFORWARD CONTROL of the saw frame feed speed of " based on workpiece hardness and actual sawing width ".Simultaneously, slave computer obtains the oil cylinder oil pressure value that pressure sensor is uploaded, and implements the closed loop feedback feeding control of permanent sawing force; What therefore, the sawing machine sawing was adopted is the compound control scheme of feedforward+feedback.AC converter adopts Delta VFD037M43A type AC converter, and proportional amplifier is selected the VT-2000 type amplifier of Co., Ltd of Beijing China moral hydraulic industry group.MCU extends out a slice EEPROM, the coefficient table of storage common used material hardness number, cross-sectional width and saw frame feed speed relation; In real time control is mainly carried out by CPLD, its pin links to each other with peripheral hardware by optocoupler, read grating scale and input switch amount signal, output switching signal drives magnetic valve or A.C. contactor by FET, drives saw frame (bar) by certain speed feeding by the analog-to-digital conversion device through proportional valve amplifier control ratio flow valve.ARM and CPLD communicate by the SPI interface, and the pin 60 ~ 63 of ARM links to each other with the pin 87 ~ 83 of EPM1270T144C5N respectively.
As shown in Figure 9, the surface chart of the upper default various workpieces cross section type of host computer touch LCD screen and parameter selection; The operator chooses cross section type, the input relevant parameter of workpiece before sawing begins, slave computer MCU is according to selected workpiece cross section type and relevant parameter, call corresponding computing formula, calculate saw frame (bar) position and workpiece cross section--the relation table of sawing workpieces width that distance measuring sensor detects; Or set up user-defined workpiece cross section type, and calculate saw frame (bar) position and workpiece cross section--the relation table of sawing workpieces width that distance measuring sensor detects, storage result of calculation; Storage sawing industry as shown in table 1 is recommended in slave computer EEPROM common metal material saw cutting speed and feeding scale.The saw cutting speed of saw frame (bar) and feed speed are mainly determined by workpiece sawing width and workpiece material (hardness).With reference to table 1, same material, its amount of feeding and sawing width are approximated to once linear relationship: V
f=kl+b.In actual use, at first provide cross section type and the relevant parameter of sawing workpieces at the touch LCD screen; Slave computer is surveyed the workpiece hardness value according to Leeb Hardness Tester, determines the saw cutting speed of saw frame (bar); According to the relation table of saw frame position and sawing workpieces width, again associative list 1 and workpiece hardness value, set up saw frame position (sawing width) feeding scale, as the foundation of implementing to become the feed speed FEEDFORWARD CONTROL.
Table 1 common metal material saw cutting speed and feeding scale
What as shown in figure 10, the saw frame feed control system of permanent sawing force change feed speed adopted is the compound control of feedforward+feedback.The output variable of FEEDFORWARD CONTROL is the set value control part that saw frame (bar) becomes feed speed, and a set value control part depends on the workpiece hardness value, and the width variate-value of workpiece during sawing; Saw frame (bar) becomes the second portion of feed speed set-point and is the output of permanent sawing force feedback feed controller; Above-mentioned " a set value control part " is used for changing the flow of proportional flow control valve, the feed speed of regulating saw frame with " second portion of set-point " sum; There is possibility and the necessity of sudden change in the sawing width of workpiece, " saw frame (bar) becomes the set value control part of feed speed " wide variety of workpiece when having reflected in real time sawing.Therefore, on the one hand, FEEDFORWARD CONTROL has overcome the negative effect of the sawing force sudden change that the sudden change of sawing width produces timely and effectively, is that the important technology that guarantees the best Sawing Process of permanent sawing force supports; On the other hand, become feed speed and become with the sawing width, improve especially the strong behave of sawing machine work efficiency and sawing workpieces quality, reduction saw blade consumption.The utility model is the setting pressure sensor in the rodless cavity oil circuit that drives oil cylinder, and the sawing force of definition feeding process is that feedback variable, the feedback feeding that realizes permanent sawing force are controlled.Workpiece sawing feeding operation is by incision, sawing and cut out the worker and advance 3 sub-operations and form; Although the incision worker advances and cuts out the worker to advance only to account for the minimum part that whole worker advances activity time, but because of its intrinsic particularity, take the control strategy different from the sub-operation of sawing--shield the output of permanent sawing force feedback feeding control, the saw cutting speed of saw blade reduces by half, hangs down the open loop control of feed speed.
As shown in figure 11, become the feeding algorithm of feed speed take the circular cross section workpiece as example.At first, measure the distance D 1 of distance measuring sensor and saw bench face under holding state, the saw blade sawtooth along with the saw bench identity distance from being D2, workpiece sensing bar lower edge and saw bench identity distance are from being D3, these pre-deposit in the nonvolatile memory as systematic parameter.Secondly, distance measuring sensor Real-time Measuring in sawing process gets distance measuring sensor and saw bench identity distance from being made as d.The 3rd, workpiece sensing bar lower surface is with after workpiece contacts, and after the top of the push rod of travel switch and workpiece sensing bar broke away from, control system namely stopped saw frame and descends, record distance measuring sensor this moment and saw bench identity distance from, be made as D4; The height of workpiece is H=D4-(D1-D2)-(D2-D3).The 4th, as d〉during H+ (D1-D2), saw frame is in non-sawing position; When d=H+ (D1-D2), saw frame is in the sawing initial position; During d＜H+ (D1-D2), saw frame is in the sawing position; D=D1-D2, saw frame are in the sawing end position.Feeding depth is in saw frame (bar) sawing process:
h=H-(d-(D1-D2)) （1）
Current sawing width
Corresponding saw frame feed speed is
The MCU of slave computer obtains current location in real time from distance measuring sensor, be updated in the formula (3), can obtain current feed speed value, enter the feed speed that the flow that drives hydraulic oil in the oil cylinder is adjusted saw frame (bar) by digital to analog converter and proportional amplifier control ratio flow valve.Must be pointed out, the sawing width value of most calculated in advance feeding depth (distance measurement value), preservation result of calculation generate feeding depth--feed speed table in the production; According to the detected value of distance measuring sensor, tabling look-up directly obtains feed speed during control; For the batch production of same specification sawing material, the table look-at method advantage that this omission is calculated is particularly evident.
As shown in figure 12, in chronological sequence the control flow of order, horizontal metal band sawing machine sawing comprises following main functional modules: initialize--download table 1, cross section type and the parameter of input workpiece, the relation table of generation saw blade position and the width of the workpiece.Read the Leeb Hardness Tester detected value, determine the saw cutting speed of saw blade.Rear vice advances according to the sawing workpieces length feeding of setting, and vice unclamped after front vice clamped, a rear vice slow astern Workpiece length, front and back vice clamp simultaneously.The saw frame fast-descending reads the saw frame position that distance measuring sensor detects.If the sawtooth height is h
j, as H+ (D1-D2)-h
jDuring＜d＜H+ (D1-D2), cut worker's progressive die formula, the saw cutting speed of saw blade reduces by half, hangs down the open loop control of feed speed; Work as D1-D2-h
jDuring＜d＜D1-D2, cut out worker's progressive die formula, the saw cutting speed of saw blade reduces by half, hangs down the open loop control of feed speed; As D1-D2＜d＜H+ (D1-D2)-h
jThe time, sawing worker progressive die formula, carry out the feedforward that permanent sawing force becomes feed speed+feedback complex control; Work as d=D1-D2-h
jThe time, sawing finishes pattern, changes subsequent processing over to.Sawing material slow astern small distance, then the saw frame fast rise resets; At last, front vice unclamps, begins next operation cycle.
Claims (1)
1. the saw frame feed system of a permanent sawing force change feed speed is characterized in that system comprises saw frame, hydraulic system, control system; Saw frame comprises that principal and subordinate wheel (1), distance measuring sensor (2), saw blade (3), workpiece sensing bar (4), Leeb Hardness Tester (5), directive slide track (6), travel switch (7), saw frame fixed mount (25), driving wheel drive variable-frequency motor (21), driven pulley tensioning hydro-cylinder (22) and be used for the grating scale (23) that feed length detects; Be provided with principal and subordinate wheel (1), distance measuring sensor (2), Leeb Hardness Tester (5), directive slide track (6), driving wheel driving variable-frequency motor (21) and driven pulley tensioning hydro-cylinder (22) at saw frame fixed mount (25), saw blade (3) links to each other with principal and subordinate wheel (1), and driving wheel links to each other with driving wheel driving variable-frequency motor (21), driven pulley links to each other with driven pulley tensioning hydro-cylinder (22); Workpiece sensing bar (4) cooperates installation with directive slide track (6); Travel switch (7) is installed in the surface of directive slide track (6); Leeb Hardness Tester (5) is fixedly mounted on the lower end of workpiece sensing bar (4), Leeb Hardness Tester (5) lower surface parallel with workpiece sensing bar (4) lower surface and on to move spacing be 1mm, grating scale (23) is installed on the stock support; Hydraulic system comprises oil cylinder (12), pressure sensor (13), sequence valve (14), solenoid directional control valve (15), proportional flow control valve (16), check valve (17), oil pump (18), filter (19) and fuel tank (20); The rod chamber mouth of oil cylinder (12) links to each other with the A mouth of solenoid directional control valve (15), the rodless cavity mouth of oil cylinder (12) respectively with sequence valve (14) input port, pressure sensor (13) links to each other, the delivery outlet of sequence valve (14) links to each other with the B mouth of solenoid directional control valve (15), the input port of check valve (17) links to each other with the delivery outlet of oil pump (18), the delivery outlet of check valve (17) links to each other with the P mouth of solenoid directional control valve (15), the input port of proportional flow control valve (16) links to each other with the T mouth of solenoid directional control valve (15), the input port links to each other with fuel tank (20), and fuel tank (20) is connected to the input port of oil pump (18) by filter (19); Control system adopts the layering hardware configuration of upper and lower computer, both carry out information interaction by the RS232 interface: the slave computer control system comprises MCU and the CPLD that is connected, MCU shields with the host computer touch LCD respectively, Leeb Hardness Tester (5), distance measuring sensor (2), pressure sensor (13), the frequency converter that driving wheel drives variable-frequency motor (21) links to each other, CPLD by photoelectrical coupler respectively with sequence valve (14), solenoid directional control valve (15), check valve (17), oil pump (18), grating scale (23) links to each other with travel switch (7), and CPLD links to each other with proportional flow control valve (16) with proportional valve amplifier by digital to analog converter.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202241494U CN202684206U (en) | 2012-05-17 | 2012-05-17 | Saw log feeding system with constant sawing variable feed speed |
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| CN2012202241494U CN202684206U (en) | 2012-05-17 | 2012-05-17 | Saw log feeding system with constant sawing variable feed speed |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102672271A (en) * | 2012-05-17 | 2012-09-19 | 杭州飘哲电子科技有限公司 | Saw frame feeding system with constant saw cutting force and variable feeding speed and saw frame feeding method |
| CN103341786A (en) * | 2013-06-27 | 2013-10-09 | 苏州边枫电子科技有限公司 | Drill bit feed speed regulation device based on substrate pressure |
| CN114789361A (en) * | 2022-05-12 | 2022-07-26 | 北京摩森纳切割技术装备有限公司 | Intelligent sawing system of high-speed sawing machine |
-
2012
- 2012-05-17 CN CN2012202241494U patent/CN202684206U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102672271A (en) * | 2012-05-17 | 2012-09-19 | 杭州飘哲电子科技有限公司 | Saw frame feeding system with constant saw cutting force and variable feeding speed and saw frame feeding method |
| CN102672271B (en) * | 2012-05-17 | 2013-10-09 | 杭州飘哲电子科技有限公司 | Saw frame feeding system with constant saw cutting force and variable feeding speed and saw frame feeding method |
| CN103341786A (en) * | 2013-06-27 | 2013-10-09 | 苏州边枫电子科技有限公司 | Drill bit feed speed regulation device based on substrate pressure |
| CN114789361A (en) * | 2022-05-12 | 2022-07-26 | 北京摩森纳切割技术装备有限公司 | Intelligent sawing system of high-speed sawing machine |
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