Highway Protective Guardrail Roll Forming Machine
During the injection molding process, when the molten plastic meets in the form of multiple strands in the cavity due to the holes in the insert, the areas where the flow rate is discontinuous, and the area where the filling material flow is interrupted, a linear weld seam is produced because it cannot be completely fused. In addition, when the gate injection molding occurs, a weld seam will also be formed, and the strength and other properties of the weld seam are poor. The main reasons are as follows: Pvc Injection,Precision Plastic Injection Mould,Oem Plastic Injection Crate Mould,Plastic Injection Mould Suzhou Dongye Precision Molding Co.,Ltd. , https://www.sjinjectionmolding.com
SUITABLE MATERIAL
Raw material: Q215, Q235A etc.
Thickness of coil: 1.5-4.5mm
Width of coil: Max 480mm
TECHNICAL SPECIFICATION &LINE COMPONENTS
(1) Hydraulic un-coiler
Capacity of loading: 5T
Motor: 2.2kw
Inner diameter of shaft: 460-520mm
Outer diameter of coil: Max 1200mm
(2)Leveling and feeding device
(3)Hydraulic punching device
Two molds punching
Punch material: Cr12
Pressure system: 0~16MPa
(4)Roll forming machine
Use independent frame (nodular cast iron) for high accuracy forming, and the stands can be changed easily
Forming step: 17-step
Diameter of shaft: 90mm
Material of roller: GCr15
Forming speed: 3-10m/min
(5)Hydraulic cutting device and run-out table
(6)PLC control cabinet
Panasonic brand PLC
Yaskawa brand Inverter
Omron brand Encoder
Touch screen operation
Digital display, English version
Processing:
The injection pressure and speed are too low, and the barrel temperature and mold temperature are too low, resulting in premature cooling of the molten material entering the mold and the appearance of weld seams.
When the injection pressure and speed are too high, injection will occur and weld seams will appear. The speed should be increased, and the back pressure should be increased to reduce the viscosity of the plastic and increase the density. Plastics should be dry well, recycled materials should be used sparingly, and weld seams may occur if the amount of release agent is too much or the quality is not good. Reduce clamping force and facilitate exhaust.
2. Mould:
If there are too many gates in the same cavity, reduce the gate or set it symmetrically, or set it as close as possible to the weld seam. The exhaust at the weld seam is poor, and an exhaust system should be set up. The sprue is too large, the size of the gating system is improper, and the gate is opened to prevent the melt from flowing around the insert hole, or use as few inserts as possible. If the wall thickness changes too much, or the wall thickness is too thin, the wall thickness of the workpiece should be uniform. If necessary, a fusion well should be opened at the fusion seam to separate the fusion seam from the workpiece.
3. Plastic aspects:
Lubricants and stabilizers should be appropriately added to plastics with poor fluidity or heat sensitivity. Plastic contains a lot of impurities, if necessary, replace the plastic with good quality.