CN103008608B - Pressure boost adjusting device and method based on on-line control of die-casting machine - Google Patents
Pressure boost adjusting device and method based on on-line control of die-casting machine Download PDFInfo
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Abstract
The invention discloses a pressure boost adjusting device and method based on on-line control of a die-casting machine. The device comprises an injection cylinder, a pressure boost cylinder, a cartridge flow valve, a pressure ejector controller and a servo motor, wherein the pressure ejector controller controls the boost pressure of the pressure boost cylinder through the cartridge flow valve; a pressure sensor used for detecting pressure signals is arranged in the injection cylinder, and is connected with the input terminal of the pressure ejector controller; an optical grating ruler is arranged on the injection cylinder, and is connected with the pressure ejector controller; the cartridge flow valve is connected to the pressure boost cylinder; the pressure ejector controller is electrically connected with the servo motor; and the servo motor is in transmission connection with the cartridge flow valve. The device can control the pressure boost process of the die casting machine on line, so as to enable the pressure to fluctuate within the required pressure curve range to effectively ensure that a die casting has a compact organizational structure and good mechanical properties, while the molding of die castings with complex shapes can be met, thereby significantly improving the yield of die castings.
Description
Technical field
The present invention relates to a kind of die casting machine, particularly based on pressurized regulating device and the method for die casting machine On-line Control.
Background technology
The pressurization of die casting machine ensures that foundry goods obtains fine and close institutional framework and the critical process of good mechanical performance, if pressurization time cross late molten metal solidify completely or boost pressure inadequate, pressurization is by ineffective, if and metal ot-yet-hardened just forms excessive boost pressure fast, hydraulic shock is likely caused to increase swollen type power, form clamp force deficiency and produce swollen type or finning, thus weaken pressurized effect, the Pressure control of existing die casting machine has been come by supercharging accumulator loop and pressurized cylinder, Pressure control system is generally by electro-hydraulic proportional flow control valve, pressure sensor and controller are formed, aperture by regulating the size of current of proportion electro-magnet to change flow control valve in control procedure, control uninterrupted thus regulate boost pressure in time, due in practical work process, due to load, oil temperature, charge oil pressure fluctuations etc. can produce interference to pressurization, therefore the aperture of how online dynamic adjustments flow control valve, improving pressurized effect is the problem that this patent solves.
Summary of the invention
The object of the invention is in order to solve above-mentioned the deficiencies in the prior art provide a kind of can the pressurization of On-line Control die casting machine, its pressure is fluctuated within the scope of needs pressure curve, effectively can ensure that foundry goods obtains institutional framework and good mechanical performance closely, the shaping of complicated shape die casting can be met simultaneously, thus significantly improve the pressurized regulating device based on die casting machine On-line Control and the method for the yield rate of die casting.
To achieve these goals, the pressurized regulating device based on die casting machine On-line Control designed by the present invention, comprise shot sleeve, pressurized cylinder, plug-in mounting flow valve, pressure emitter controller and servomotor, described pressure emitter controller controls the boost pressure of pressurized cylinder by plug-in mounting flow valve, the pressure sensor of detected pressures signal is provided with in shot sleeve, described pressure sensor is connected with the input of pressure emitter controller, shot sleeve is equipped with grating scale, described grating scale is connected with pressure emitter controller, described plug-in mounting flow valve is connected with pressurized cylinder, described pressure emitter controller is electrically connected with servomotor, described servomotor and plug-in mounting flow valve are in transmission connection.
Described plug-in mounting flow valve comprises cover plate, push rod, spool and cushion block, described plug-in mounting flow valve is connected with pressurized cylinder by push rod, servomotor is provided with adjusting screw(rod), and described servomotor is connected with push rod by adjusting screw(rod), described spool is placed on outside push rod, and spool side is provided with valve pocket, described cover plate is fixedly connected with by cushion block with between push rod.
Described servomotor is installed on the cover board.
Shot sleeve is provided with seat board, seat board is provided with support plate, described grating scale is arranged on support plate.
Described pressure emitter controller comprises comparing element unit, D/A converting unit and servo controller unit, the input of described comparing element unit is connected with pressure sensor and grating scale simultaneously, the output of described comparing element unit is connected with the input of D/A converting unit, the output of described D/A converting unit is connected with servo controller unit, and servo controller unit is electrically connected with servomotor.
Based on a load control method for die casting machine On-line Control, comprise the following steps:
(a) by grating scale detect shot sleeve injection complete after injection punch head displacement signal thus start position signalling to pressurized cylinder be provided, and detect shot sleeve pressure signal in combination with pressure sensor thus obtain each injection punch head distance, speed and boost pressure three curves in moment, and draw the increasing pressure curve of non-defective unit in conjunction with the finished product state of each product;
(b) with the increasing pressure curve calculated for foundation, if just carry out on-line control when pressure measuring value in process exceedes this increasing pressure curve positive and negative deviation 5%: now by grating scale detect shot sleeve injection complete after injection punch head displacement signal and be transferred to pressure emitter controller in conjunction with the pressure signal that pressure sensor provides simultaneously, servo controller unit is transferred to after signal transacting change, servo controller unit sends instruction and realizes servomotor running, and carry out Real-time Feedback by pressure sensor, servomotor just can promote the aperture size that push rod regulates plug-in mounting flow valve in real time by Direct driver adjusting screw(rod), thus supply pressurized cylinder meets the hydraulic power oil of real-time supercharging requirement, the pressure signal provided by the displacement signal that provided by grating scale and pressure sensor is controlled supercharging simultaneously and starts, the aperture of plug-in mounting flow valve is regulated by servomotor, thus realize supercharging startup, boost pressure is adjustable more flexibly, and in repeatedly running, according to real-time situation of change, automatic regulating valve mouth aperture size in upper opening process once also can fluctuate in error range according to increasing pressure curve, effectively can eliminate shrinkage cavity and the pore of cast-internal, improve compactness, reduce the deficient casting of casting exterior, cold shut and the quality problems such as profile is unintelligible, to reduce the number of rejects and seconds rate.
The pressurized regulating device based on die casting machine On-line Control that the present invention obtains and method, can the pressurization of On-line Control die casting machine, its pressure is fluctuated within the scope of needs pressure curve, effectively can ensure that foundry goods obtains institutional framework and good mechanical performance closely, the shaping of complicated shape die casting can be met simultaneously, thus significantly improve the yield rate of die casting.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of embodiment 1;
Fig. 2 is the structural representation of embodiment 2;
Fig. 3 is the partial enlarged drawing of Fig. 2;
Fig. 4 is the structure principle chart of embodiment 3;
Fig. 5 is the structure principle chart of embodiment 4.
In figure: pressure sensor 1, pressurized cylinder 2, plug-in mounting flow valve 3, pressure emitter controller 4, servomotor 5, grating scale 6, comparing element unit 7, D/A converting unit 8, servo controller unit 9, cover plate 10, push rod 11, spool 12, cushion block 13, valve pocket 14, adjusting screw(rod) 15, shot sleeve 16, seat board 17, support plate 18.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further described.
Embodiment 1:
As shown in Figure 1, pressurized regulating device based on die casting machine On-line Control provided by the invention, comprise shot sleeve 16, pressurized cylinder 2, plug-in mounting flow valve 3, pressure emitter controller 4 and servomotor 5, described pressure emitter controller 4 controls the boost pressure of pressurized cylinder 2 by plug-in mounting flow valve 3, the pressure sensor 1 of detected pressures signal is provided with in shot sleeve 16, described pressure sensor 1 is connected with the input of pressure emitter controller 4, shot sleeve 16 is equipped with grating scale 6, described grating scale 6 is connected with pressure emitter controller 4, described plug-in mounting flow valve 3 is connected with pressurized cylinder 2, described pressure emitter controller 4 is electrically connected with servomotor 5, described servomotor 5 is in transmission connection with plug-in mounting flow valve 3.
Embodiment 2:
As Fig. 2, as shown in Figure 3, the general configuration of the present embodiment is consistent with embodiment 1, cover plate 10, push rod 11, spool 12 and cushion block 13 is comprised unlike described plug-in mounting flow valve 3, described plug-in mounting flow valve 3 is connected with pressurized cylinder 2 by push rod 1, servomotor 5 is provided with adjusting screw(rod) 15, and described servomotor 5 is connected with push rod 11 by adjusting screw(rod) 15, described spool 12 is placed on outside push rod 11, and spool 12 side is provided with valve pocket 14, described cover plate 10 is fixedly connected with by cushion block 13 with between push rod 11; Described servomotor 5 is arranged on cover plate 10;
Embodiment 3:
As shown in Figure 4, the general configuration of the present embodiment is consistent with embodiment 2, is provided with seat board 17 unlike on shot sleeve 16, and seat board 17 is provided with support plate 18, and described grating scale 6 is arranged on support plate 18.
Embodiment 4:
As shown in Figure 5, the general configuration of the present embodiment is consistent with embodiment 2, unlike preferably designing in the present embodiment, described pressure emitter controller 4 comprises comparing element unit 7, D/A converting unit 8 and servo controller unit 9, the input of described comparing element unit 7 is connected with pressure sensor 1 and grating scale 6 simultaneously, the output of described comparing element unit 7 is connected with the input of D/A converting unit 8, the output of described D/A converting unit 8 is connected with servo controller unit 9, and servo controller unit 9 is electrically connected with servomotor 5.
In real work, die casting machine 16 is after injection completes, aluminium alloy is full of mold cavity, and injection plunger must immediately with the molten metal of ot-yet-hardened in larger pressure pushing die die cavity, oneself is made to organize finer and close by shaping cast-internal, pressurization that Here it is, the size of boost pressure is determined by formula (1).
Above-mentioned formula 1. in:
P1 mono-acts on the pressure of motlten metal in die cavity
P2 mono-injection chamber oil pressure
P3 mono-pressurized cylinder oil pressure
D1 mono-shot sleeve diameter
D2 mono-pressurized cylinder piston shank diameter
D3 mono-pressurized cylinder diameter
D4 mono-punch diameter
In general die casting machine 16 system, Pressure control is generally made up of electro-hydraulic proportional flow control valve, pressure sensor 1 and controller, aperture by regulating the size of current of proportion electro-magnet to change flow control valve in control procedure, the i.e. flow continuity equation formula 2. determined x of pressurized cylinder, just adjustable boost pressure.
In above-mentioned formula (2) formula:
K mono-fluid elastic modelling quantity
Oil liquid pressure in Pf mono-accumulator
Cd mono-discharge coefficient
The gain of wx mono-inserted valve valve port opening
Pa mono-pressurized cylinder oil pressure
ρ mono-fluid density
The movement velocity of v mono-pressurized cylinder piston
Va mono-pressurized cylinder large chamber volume
X mono-inserted valve valve port opening
The effective work area of A mono-pressurized cylinder
After generally calculating aperture size, the size of current inputted just is determined, but the interference suffered by Hydrauservo System is a lot, as load, oil temperature, charge oil pressure fluctuation etc. can have an impact to the output of system, and general system cannot improve system be disturbed after dynamic change, the closed loop transfer function, of this pressure charging system is
Above-mentioned formula is 3. in formula:
The undamped natural frequency of a mechanical system of ω n-pressurized cylinder;
The damping ratio of ζ-pressurized cylinder working chamber;
The leadage coefficient of K1-pressurized cylinder working chamber;
V-hydraulic cylinder works chamber and oil inlet pipe inner fluid volume;
B---viscous damping coefficient;
The present embodiment provides a kind of load control method based on die casting machine On-line Control, comprises the following steps:
(a) by grating scale 6 detect shot sleeve 16 injection complete after injection punch head displacement signal thus give pressurized cylinder 2 start position signalling is provided, and detect shot sleeve 16 pressure signal in combination with pressure sensor 1 thus obtain each injection punch head distance, speed and boost pressure three curves in moment, and draw the increasing pressure curve of non-defective unit in conjunction with the finished product state of each product;
(b) with the increasing pressure curve calculated for foundation, if just carry out on-line control when pressure measuring value in process exceedes this increasing pressure curve positive and negative deviation 5%: now detected by grating scale 6 shot sleeve 16 injection complete after injection punch head displacement signal and in conjunction with the pressure signal that pressure sensor 1 provides be transferred to simultaneously pressure emitter controller 4, servo controller unit 9 is transferred to after signal transacting change, servo controller unit 9 sends instruction and realizes servomotor 5 and operate, and carry out Real-time Feedback by pressure sensor 1, servomotor 5 just can promote the aperture size that push rod 15 regulates plug-in mounting flow valve 3 in real time by Direct driver adjusting screw(rod) 15, thus supply pressurized cylinder 2 meets the hydraulic power oil of real-time supercharging requirement.
Claims (1)
1., based on a load control method for die casting machine On-line Control, comprise
For detect shot sleeve (16) injection complete after the grating scale (6) of displacement signal of injection punch head;
For detecting the pressure sensor (1) of shot sleeve (16) pressure signal;
For receiving displacement signal and shot sleeve (16) pressure signal of injection punch head, and after signal transacting change, be transferred to the pressure emitter controller (4) of servo controller unit (9);
For controlling the servo controller unit (9) of servomotor (5);
For regulating the servomotor (5) of the aperture size of plug-in mounting flow valve (3);
And plug-in mounting flow valve (3);
It is characterized in that concrete steps are as follows: (a) by grating scale (6) detect shot sleeve (16) injection complete after injection punch head displacement signal thus give pressurized cylinder (2) start position signalling is provided, and detect shot sleeve (16) pressure signal in combination with pressure sensor (1) thus obtain each injection punch head distance, speed and boost pressure three curves in moment, and draw the increasing pressure curve of non-defective unit in conjunction with the finished product state of each product;
(b) with the increasing pressure curve calculated for foundation, if just carry out on-line control when pressure measuring value in process exceedes this increasing pressure curve positive and negative deviation 5%: now by grating scale (6) detect shot sleeve (16) injection complete after injection punch head displacement signal and in conjunction with the pressure signal that pressure sensor (1) provides be transferred to simultaneously pressure emitter controller (4), servo controller unit (9) is transferred to after signal transacting change, servo controller unit (9) sends instruction and realizes servomotor (5) running, and carry out Real-time Feedback by pressure sensor (1), servomotor (5) just can promote the aperture size that push rod (11) regulates plug-in mounting flow valve (3) in real time by Direct driver adjusting screw(rod) (15), thus supply pressurized cylinder (2) meets the hydraulic power oil of real-time supercharging requirement.
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| CN105697472A (en) * | 2014-07-18 | 2016-06-22 | 江苏省电力公司南通供电公司 | Control method of electro-hydraulic proportional loop system capable of improving pressing performance effectively |
| CN106001492A (en) * | 2016-08-05 | 2016-10-12 | 富乐压铸(太仓)有限公司 | Production process of high-compactness automobile vibration attenuation balance weight block |
| CN110666083A (en) * | 2019-09-10 | 2020-01-10 | 苏州三基铸造装备股份有限公司 | Multipoint real-time control type extruding and forging composite forming equipment |
| CN110548854B (en) * | 2019-10-23 | 2021-12-10 | 广东宝洋科技有限公司 | Forging control method for metal product |
| CN111604487B (en) * | 2020-04-24 | 2021-12-07 | 无锡新佳盛压铸机制造有限公司 | Environment-friendly energy-saving die casting machine electrohydraulic control system |
| CN116765352A (en) * | 2022-01-26 | 2023-09-19 | 邓少聪 | Vertical-punching die casting machine for die casting stainless steel |
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| EP0481413A1 (en) * | 1990-10-15 | 1992-04-22 | Nippondenso Co., Ltd. | Method of discriminating quality of die-cast article and die-casting process using same |
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Address after: No. 699 Jinghua Road, High tech Zone, Ningbo City, Zhejiang Province, 315103 Patentee after: SIJIN INTELLIGENT FORMING MACHINERY CO.,LTD. Address before: 315103 1832 Jiangnan Road, Ningbo high tech Zone, Zhejiang Patentee before: SIJIN INTELLIGENT FORMING MACHINERY CO.,LTD. |
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