How Vacuum Forming Machine Are Made
I am going to try to tell you in as few words as possible, how vacuum forming machine are made.The first step is making the "buck". This is the name of the piece that the forming will be done over.Furthermore, by the provision of entirely independent transfer means for effecting the transfers between stations A, B and C and the deadplate, the movement of each transfer means is enabled to suit the state of the glass as it is being moved bythat transfer means. Immediately after its formation at station A the parison is relatively stiff and may be moved quickly from station A to station B, but after reheating at station B the further formed parison is relatively soft and must be moved moreslowly from station B to station C. However, after formation of the article of glassware at station C this is again relatively stiff and may be moved swiftly to a position over the deadplate.
This has to be smooth, strong, heat resistant, and free of undercuts. The smooth part is self explanatory. The strong part is so that it will not be crushed when the plastic is being formed over it. The heat resistant part is because the plastic is at about 300 degrees F.And no ndercuts is so that you will be able to get your piece out of the mold without having to cut the mold off. All these are of equal importance. They all must be done, and done right! This is the time consuming part of making the molds.
As soon as the plastic has reached it flow temperature it is pressed down onto the buck and vacuum is applied at the same time.The vacuum forming machine over the buck and cools. This takes about 15 seconds!Once it has cooled (about 30 seconds) you pop the buck out, take the plastic out of its clamp frame and trim out the mold!and independently operable first and second transfer means, the first transfer means including a neck ring structure and actuating means for moving the neck ring structure from a first position in which the neck ring tructure engages aparison in the blank mould at the first station to a second position in which the neck ring structure releases a parison at the second station and returning the neck ring structure from the second position to the first position prior to the formation ofanother parison in the blank mould at the first station, and the second transfer means including gripping means and actuating means for moving the gripping means between a first position in which the gripping means engages a parison at the second stationand a second position in which the gripping means holds the parison in such a location at the third station that the blow mould at the third station can close around the parison.
This method can be used in 90% of the molds you will want to make. I would advise against trying to make the more complicated and expensive rubber molds until you can whip off a couple of this style in a day without any problem.the parison is moved from the second station to the third station by a second transfer means in a second time, the article of glassware is removed from the third station to a take-out position beyond the third station by athird transfer means in a third time, whereby the period elapsing between the time at which the first transfer means presents the parison to the second station and the time at which the second transfer means moves the parison from the second station tothe third station is adjustable without altering the relative timing of any of the vacuum forming machine comprised within either the primary cycle or the secondary cycle, and wherein each of the parison, the further formed parison, and the article ofglassware is moved by the first; second and third transfer means, respectively, at rates of acceleration suitable for the condition of the glass contained therein at the time of movement.
Once this has been done the buck is placed on he table of the vacuum forming machine. The blank piece of plastic is clamped into its frame and heated.whereby the period elapsing between the time at which the first transfer means presents the parison to the second station and the time at which the second transfer means moves the parison from the second station tothe third station is adjustable without altering the relative timing of any of the machine functions comprised within either the primary cycle or the secondary cycle, and wherein each of the parison, the further formed parison, and the article ofglassware is moved by the first; second and third transfer means, respectively, at rates of acceleration suitable for the condition of the glass contained therein at the time of movement.
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