CN101259745A

CN101259745A - Application of RJG system in injection moulding and forming process

Info

Publication number: CN101259745A
Application number: CNA2008100238955A
Authority: CN
Inventors: 郑小培
Original assignee: NYPRO MACHINERY (SUZHOU) CO Ltd
Current assignee: NYPRO MACHINERY (SUZHOU) CO Ltd
Priority date: 2008-04-21
Filing date: 2008-04-21
Publication date: 2008-09-10

Abstract

The invention relates to an injection molding control technique, in particular to an application of an RJG system in an injection molding process. The RJG system, which comprises a Lynx digital device, an eDART production and working procedure controller, an eDART system software, is connected together with a pressure pickup, a mould and an injector to monitor and control the injection molding process. The injection molding control technique has the advantages that production can be arranged better; problems can be solved faster; meanwhile, we are capable of distinguishing and identifying problems of a mould, a machine or materials in virtue of the real time monitoring capacity of the system; through reducing changes of the technique, the technique and efficiency are continually promoted; the quality is improved; the production cost is lowered; things occurring in the mould can be observed in a perspective of plastic.

Description

The application of RJG system in injection molding process

Technical field

The present invention relates to a kind of injection mo(u)lding control technology, the especially application of RJG system in injection molding process.

Background technology

In injection molding process control, injection pressure is one of of paramount importance molding parameter in the forming process.In the injection molding process, pressure is to change along with the process of injection moulding process is continuous, and the track of this variation forms a pressure history.General injection machine only shows the pressure history of screw rod metering zone, the injection pressure curve of injection moulding process setting just.Because the restriction of control system, the injection pressure of setting can only be a linear change.The control of traditional pressure all concentrates in the control to injection pressure, dwell pressure and plasticizing pressure, all is based on the technician and regulates the injection machine parameter and control injection pressure, dwell pressure and plasticizing pressure.

Even more important in the injection moulding process is cavity pressure, generally with the pressure curve of flow field end just mold cavity inlet end pressure curve definitions be the cavity pressure curve.This pressure equals nozzle end pressure in the injection machine and deducts the pressure loss on runner and the cast gate, because the frictional dissipation in pressure transmission and the runner process makes cavity pressure change the injection pressure that all will lag behind setting on time and numerical value.Therefore the interior actual pressure of reflection die cavity that the pressure that shows on the injection machine can not be real.

And cavity pressure is and the maximally related variable of part quality, and this is the pressure of measuring in the place of forming parts after all.Cavity pressure can be used for monitoring such as pts wt, size, overlap, shrink, short penetrating and characteristic such as warpage.Deviation in the injection moulding process is detected and controls, can guarantee the quality of part.Therefore the cavity pressure monitoring is the diagnostic tool that Shooting Technique is secured good health and keep fit.For many years,, more can't understand the distribution and the variation of die cavity internal pressure in the injection moulding process, be difficult to problem is analyzed, say nothing of the correction problem owing to can't see die cavity inside.Injection moulding at present is forced to rely on a kind of method of test always, promptly constantly changes condition of molding by the technician, does not have defective and the qualified product of size up to obtaining outward appearance.

Summary of the invention

Can provide a window of observing mould inside to the continuous monitoring of cavity pressure, cavity pressure provides exact method for the part of quality of production unanimity simultaneously.Making injection machine is that the variation that takes place affords redress, and the most stable environment can be provided in die cavity.Can have an X-rayed whole technology by the RJG system, enable to set up more stable, technology repeatably.By using data and the template of setting up in initial start, can reduce and obtain required time of optimum efficiency and effort.

The purpose of this patent is to eliminate checks cost, improves technology, and operation was quickly corrected unusual before defective work occurs to such an extent as to know abnormal conditions at once.Simultaneously, injection workshop easily transfer mold from a machine to another machine, from one place to another, and need not development technology again.For the toolmaker, maximum value is to adopt the strict die trial of mould of equipment pressure sensor, and this can be provided with a technology and optimize in first and second time die trial, utilizes it to minimize necessary die trial number of times in the die trial afterwards.In case finish this, correct size and production capacity are identified, and technology template and mould are given injection moulding factory together and set.

For realizing above-mentioned goal of the invention, the technical solution used in the present invention is as follows: the RJG system is made up of following critical piece: Lynx digital device, eDART production and operation controller, eDART systems soft ware.These and pressure sensor, mould and injection machine link together and can monitor and control injection molding process.

At first the mould of wanting die trial is carried out the setting pressure sensor, present pressure sensor has two kinds of direct type and indirect-type.Directly type be back at die cavity near installing hole of die cavity place processing, make sensor concordant with mold cavity surface, suitable line passes mould and is connected on the connector outside the mould.This class sensor is the pressure that transmits plastics by thimble or fixing pin, and sensor is on ejector retainner plate or pressing plate.The indirect-type sensor be placed on usually the existing thimble of ejector retainner plate below, usually sensor is placed on the pressing plate of mould, by ejector pin or transmit pin and measure.Advantage that utilize to transmit pin is, utilized existing thimble but sensor is not subjected to the influence of ejecting force.

After mould, injection machine and RJG system connected, start the RJG system, after the relevant informations such as input pattern number, material, cave number, enter and start the interface.Enter sensor after system has landed the interface is set, the corresponding pattern number of needle can be set, by debugging, to the accurate position in the needle formulation mould.After entering operation interface, the size of pressure sensing pin and screw diameter need be set, and injection pressure on the injection machine and screw position are made zero, just can operate afterwards.

The operation principle of RJG system is: when filling, feeding, pressurize and cooling, during policy point in plastic melt is flowed through die cavity during the setting pressure sensor, the pressure of their positions is also read in the pressure sensor induction.Pressure sensor is converted into signal with these information and is sent to monitoring system then, then shows real-time pressure curve on computers.Regulate technological parameter by 2 sections injection molding forming methods, in case realize an optimised process, so collected data will be used to create a technological parameter template.Template is like this produced the steady quality of having guaranteed part.Can check that to the real-time analysis of technology and injection machine current injection pressure, machine variation, injection capacity, material viscosity change and other many data.

Beneficial effect of the present invention:

Use patent of the present invention to arrange production faster, and deal with problems more efficiently.Visual technology shows makes us can find many typical mistakes immediately, and in time corrects rather than guess at random.The real-time monitoring capacity of this system can have the ability to discern the problem of mould, machine, material by let us simultaneously, and fast is easy to distinguish.The template of having the ability the cavity pressure curve is set is from machine to machine, and factory is to factory, with the irrelevant technology coupling of model or manufacturer of machine.By reducing technique change, technology and efficient have obtained continuous improvement, and quality is improved, and have also reduced cost simultaneously, make us observe mould inside institute occurrence from the angle of plastics.

The specific embodiment

The RJG system is made up of following critical piece: Lynx digital device, eDART production and operation controller, eDART systems soft ware.These and pressure sensor, mould and injection machine link together and can monitor and control injection molding process.

Claims

1. the application of RJG system in injection molding process, it is characterized in that: by the RJG system that Lynx digital device, eDART are produced and operation controller, eDART systems soft ware are formed, RJG system and pressure sensor, mould and injection machine link together injection molding process are monitored and controls.