A method for manufacturing a curved surface transparent part with variable thickness
A manufacturing method and technology of transparent parts, which is applied in the manufacture of variable-thickness curved surface transparent parts and high-precision fields, can solve the problems of long manufacturing process and high production cost, reduce molding cycle, reduce production cost, and improve residual stress Effects of Level and Dimensional Accuracy
Active Publication Date: 2017-05-24
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology
The existing variable-thickness curved surface transparent parts mostly adopt a combined structure, that is, multiple pieces of equal thickness are spliced together, the manufacturing process is long, and the production cost is high.
Method used
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Embodiment
[0027] (1) Preliminary preparation: put the OQ2720 polycarbonate pellets in a vacuum dehumidification dryer, and dry them at 120°C for 4 hours. The dried pellets enter the screw through the hopper and are plasticized. The plasticized back pressure is 10bar. The plasticizing temperature is divided into seven areas from the hopper to the nozzle: 160°C, 220°C, 260°C, 280°C, 300°C, 300°C and 290°C;
[0028] (2) Injection - one-time overall injection compression: the temperature of the movable mold 2, fixed mold 3 and insert 4 in the thick-walled area of the part must be maintained at 160 °C, and the high-temperature melt 1 in step (1) is pushed by a screw 20mm / The speed of s is injected into the mold with a cavity expansion gap of 5mm, and the pressure is maintained for a short time of 0.5s to ensure that the melt will not flow back. At the same time, the mold is closed at a speed of 30mm / s to form a mold cavity with a thickness of 15mm. At this stage As the clamping force is 3...
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Abstract
The invention belongs to the technical field of injection forming and relates to a method for manufacturing a variable-thickness structural transparent workpiece, and particularly relates to a method for manufacturing a high-accuracy variable-thickness cambered transparent workpiece. The method disclosed by the invention carries out forming processing on a variable-thickness workpiece by adopting a primary integral injection compression and secondary differential expansion injection compression combined injection forming method, thereby effectively controlling the surface quality and retracting warpage of the workpiece in areas with different thicknesses; in addition, the method disclosed by the invention carries out forming by selecting a polycarbonate material with excellent impact resistant property, thereby ensuring the characteristics of light weight and transparency of the workpiece. According to the method, the mould temperature is controlled to be higher than plastic glass transition temperature in a stage of filling a cavity through a fusant by applying a dynamic variable-mould temperature control technology, and after expansion and compression are finished, the mould temperature is fast reduced to sufficiently cool a shaped workpiece, so that the surface quality of the workpiece is ensured, the forming period is shortened, and the production cost is reduced. The workpiece manufactured by adopting the method disclosed by the invention can achieve the light transmittance of more than 75%, and the optical distortion of an effective area can be controlled to be less than 1 / 10.
Description
technical field [0001] The invention belongs to the technical field of injection molding, and relates to a method for manufacturing transparent parts with variable thickness structures, in particular to a method for manufacturing transparent parts with high precision and variable thickness curved surfaces. Background technique [0002] Transparent parts are used in the fields of aerospace, automobiles, ships, and electronic information. Their structures and functions vary greatly. Among them, observation windows and optical shields are mostly transparent parts with variable thickness curved surfaces. Under the premise of ensuring good optical performance Achieve weight reduction and impact resistance. As an important engineering plastic, polycarbonate has the characteristics of impact resistance, high temperature resistance and transparency. It has been successfully applied in the fields of aircraft cockpit transparent parts, astronaut windows, automotive glass and optical l...
Claims
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IPC IPC(8): B29C45/00B29C45/57B29C45/76B29B13/06B29L11/00
CPCB29C45/76B29C45/77B29C45/78B29C2945/76498B29C2945/76531B29C2945/76551B29L2011/00
Inventor 颜悦王韬厉蕾葛勇
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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