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 Posted: Thu 7:50, 30 Dec 2010 Post subject: air jordan shoes cheap Typical automatic injection |
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Typical automatic injection mold off the thread
Pin 35. Screws 36. Tension Wheel \No. 8, No. 13 chain driven total screw-type core rotation, at the same time, ¢ò ¢ò parting rely on a stretch beginning in the spring type, and rely on just turning in circles and thread plastic parts serve to prevent the common core rotation effect. When the thread completely, after extrusion, injection molding machines top out of body motion, moving through the top peak of the staff of secondary push plate so that the mold surface from ¢ó ¢ó type of a complete security circle concave plastic part of the stripping, the product from the mold prolapse, complete a production cycle. Note that, ¢ò ¢ò surface of a type to be moderate when the spring force, excessive force could easily lead to thread damage to the last button, the power is too small is not easy to open sub-surface, can improve the manufacture of precision moving parts to adjust the spring compression amount to be adjusted. 3.2 gating system design as a larger production capacity, and high quality requirements, the design uses needle-type point gate hot runner gating system. With hot runner is due to heating, insulation and temperature control means, the molten plastic delivered to the mold cavity, so the flow internal pressure loss, good melt flow,[link widoczny dla zalogowanych], density, stress reduction products, deformation greatly weakened significantly improved dimensional stability. In addition, the flow of hot runner eliminates waste, significantly reducing the cost of production; needle nozzle automatically cut off the gate and improve the production efficiency. In summary, for the mass production of plastic products, hot runner selection is very reasonable choice. 3.3 mold cooling to improve production efficiency, to prevent plastic deformation, and to prevent mold caused by thermal expansion of the killed phenomenon, the mold cooling system must be fully reliable. Often due to screw in a rotating core, can not be directly cooled,[link widoczny dla zalogowanych], so the die design center in the core part of the increase threaded core cooling, cooling water through the introduction of copper core, the formation of circulation, better core of the thread to complete cooling. Given cavity cooling, the use of eight straight water,[link widoczny dla zalogowanych], with hoses connected to form an external loop, the fixed mold cooling. 3.4 mold material selection to face the increasingly fierce market competition, high-quality, long-life mold needs more and more how to improve the life of the mold,[link widoczny dla zalogowanych], the mold has been fully aroused attention to manufacturing industries. Improve the level of mold design, strict control ~ n-r_ accuracy, is one of the ways to solve mold life, but good or bad mold material, then play a decisive role in tool life. Since large cap mold, mold release to be rotation, there are no special requirements on polishing the mold, so mold material should be used in high wear resistance, high hardenability material. Accordingly, the die design key parts for the company's CALMAX635 ASSAB selected materials, heat treatment, 56 ~ 60HRC. Through the use of good results. 4 die because of drive part of the design does not slip in the drive chain, drive more compact size, without much tension, the load acting on the shaft smaller, more efficient, more suitable for the requirements of the mold in the drive, and the market on chains, sprockets, motors purchasing convenience, no special processing, so the use of chain drive transmission design. 4.1 mold cavity and the sprocket center distance determination of parameters to consider the design cavity size and structure size combination of factors, the center distance between the cavity should be between 150mm is more reasonable. The check through the sprocket, the design uses a chain pitch p = 15.875mm, ZI = 23 teeth sprocket, sprocket pitch diameter (D) 150mm center distance of die design to meet the requirements. D == 117mm roar roar n n a sprocket to increase the engagement of a number of teeth, making the drive more stable, the design of the addition of two tension wheel (36 pieces), with favorable results. 4.2 The selection of motor speed and bearing rotation due to plastic parts can be threaded after 5 laps prolapse, in order to ensure the normal life of the mold, screw-type core speed should not be too fast. Therefore the design of stripping per 5s to complete a rotation basis, the speed should be large sprocket 60 turn / min. Sprocket Gear Ratio::: base, such as setting the transmission ratio zl a 0.5, the small sprocket Z2-11, n2-120 turn / min. Therefore, the motor speed reducer should be used in the 120 r / min. As used in this mold centering bearing it is necessary to play the role,[link widoczny dla zalogowanych], but also to withstand injection pressure on the axial drive screw core force, so the bearings must be used to support radial load and axial load. GB roller bearing thrust to the heart to meet the above conditions, the design chosen radial thrust roller bearings. 5 Conclusion Unscrewing mold structure in many, by comparison, such a compact design, smooth operation, transmission, cooling and other aspects of the design to achieve good results, is a good, worthy of a typical auto-off thread die structure.
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[link widoczny dla zalogowanych]
[link widoczny dla zalogowanych]
[link widoczny dla zalogowanych]
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