There are many reasons for molders to change molds in plastic process. Commonly, injection molding machines are out of action far longer than necessary due to various avoidable deviations in mold changeover process. HVR MAG embraced the challenge in this process, and has specifically engineered quick mold change system for IMM. The 8 safety attributes of this system has helped numerous companies reap the benefits of immensely reduced changeover times, from hours to minutes, lower capital investment and faster change overs, with safety guaranteed.
HVR MAG quick mold change system, features 8 safety precaution attributes that make it particularly effective and safe.
- Closeness Detection
In Mold Changing State, the surface of the mold should be in full contact and closely clamped by magnetic platens at each side, no interval gap existed. Only in this condition can the MAG phase can be realized.
- Magnetic Flux Detection
Release of the machine is only given if the measured magnetic flux after MAG, reaches the standard minimum predefined safety value. If this is not the case, an error is indicated. If during the injection moulding process the magnetic flux value decreases minimally, the machine stops immediately.
- Temperature Detection
It is engineered to send an alarm signal if the temperature exceeds the standard value. Thus, to prevent demagnetization of the magnetic platens caused by an extremely high temperature,
- Pulse Current Value Detection
In MAG and DEMAG phases, the control system monitors the value of pulse current and will send a successful signal only when the pulse current reaches the required value.
- Mold Dislocation Detection
It detects the real time location of the mold in Injecting State, and will send an alarm signal if there’s a slight slide of the mold, to stop the running molding process.
- Distance Detection
Only when the distance between the mold and magnetic platens is less than 0.2mm, will the controller authorize the proceeding of MAG and DEMAG phases. Otherwise an alarm signal will be sent to stop the running of the plastic injection machine.
- Interlock Control System
This Interlock Control System allows the injection machine to work only on condition that all detection signals are normal – with both movable and fixed magnetic platens successfully magnetized and the key switched to Injecting State.
- State-switching Key Design
Using a key to switch between Mold Changing State and Injecting State. Demagnetization operation will only be valid with the key switched to Mold Changing State and DEMAG button pressed simultaneously. If the key been switched to Injecting State, MAG and DEMAG operation can not be achieved.
Here are some possible questions you may have after going through the above:
What is magnetic flux?
Magnetic flux is defined as the number of magnetic field lines passing through a given closed surface. It provides the measurement of the total magnetic field that passes through a given surface area.
What exactly are magnetic platens?
Magnetic platens(magnetic clamping plates) are mold clamping plates with powerful magnetic force for injection molding machines. Usually it comes in one set of two plates for a movable platen and a fixed platen.
Getting change-overs right is particularly important to factory’s focus on short-run manufacturing. And speeding up the changeover time of molds generally pays itself back very quickly. Utilizing magnetic quick mold change system on a plastic injection molding machine has many benefits, especially when the production volumes are lower and change overs are frequent. The time required for change overs is also drastically reduced to typically with several minutes versus multiple hours for a traditional mold changing process. Moreover, it makes the plastic injection molding a safer process.
