Important technical parameters to pay attention to when buying injection molding machines

Whether you are buying a new injection molding machine or a used one, you must pay attention to the following parameters:

1. Technical parameters of injection molded parts
(1) Screw diameter: the outer diameter of the screw
(2) The effective length of the screw: the length of the screw thread (MM) is often expressed as L
(3) Screw length to diameter ratio L/D: the ratio of the effective length of the screw to the diameter
(4) Screw compression ratio V2/V1: The ratio of the volume V2 of the first groove of the screw feeding section to the volume V1 of the last groove of the metering section
(5) Injection stroke: the maximum distance of screw movement, the maximum distance of screw retreat
(6) Theoretical injection volume: the product of the JIE area of ​​the screw head and the maximum injection stroke
(7) Injection volume: the maximum weight of the screw that injects PS at one time (g)
(8) Injection pressure: the maximum pressure of the pre-melted material on the head during injection MPa
(9) Injection speed: the maximum speed of screw movement during injection (mm/s)
(10) Injection time: During injection, the shortest time for the screw to complete the injection stroke
(11) Injection rate: theoretical volume injected per unit time; screw JIE area × maximum speed
(12) Screw speed: the lowest and highest speed range of the screw when the material is plasticized
(13) Plasticizing capacity: the maximum weight of plasticized materials per unit time
(14) Screw torque: The maximum torque of the screw drive when the material is plasticized (N/m)
(15) Nozzle extension: the length of the nozzle extending from the front template and the mold installation plane

2. Technical parameters of the clamping parts
(1) Mold clamping force: the maximum locking force to overcome the melt expansion and lock the mold
(2) Forming area: refers to the maximum projected area of ​​the clamping force under a certain cavity pressure
(3) Mold opening force: the maximum force to open the mold in order to take out the product
(4) Mold opening stroke: the maximum distance that the template can move in order to take out the product
(5) Template size: front and rear fixed and movable template mold installation flat size
(6) Tolerance modulus: the maximum and minimum thickness of the mold that can be installed on the injection molding machine
(7) Template distance: the maximum and minimum distance between the fixed template and the movable template of the injection molding machine
(8) Tie rod spacing: the spacing between the horizontal and vertical inner sides of the tie rods of the injection molding machine (mm)

3. Performance parameters of the whole machine
(1) The maximum driving power of the motor: the power of driving the oil pump motor (KW)
(2) Oil tank capacity: the rated capacity of the oil tank of the hydraulic system
(3) Machine volume: the maximum length × height × width of the shape of the machine
(4) Weight: the total weight of the machine.

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