Barrel Clamping
Barrel Clamping
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 UMAREX USA RWS LOCK DOWN MOUNT 1" 230-0596  US $36.13
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 AIM - TACTICAL SHOTGUN TRI-RAIL BARREL MOUNT US $16.95
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 UTG Universal Rifle Tri-Rail Barrel Mount w/ 2 Slots MNT-BR002 US $18.99
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 UTG Universal Rifle Tri-Rail Barrel Mount W/ 5 Slots MNT-BR005 US $27.99
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 shot gun barrel mount w Laser Clamp, universal rail US $16.99
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 Universal Tri Rail Barrel Mount Weaver US $16.95
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 UTG Universal Tri-rail Barrel Mount with 2 Slots MNT-BR002 US $17.85 |
 UNIVERSAL SINGLE-RAIL BARREL MOUNT NEW UTG US $10.40
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 12 Gauge SHOTGUN UNIVERSAL BARREL CLAMP ON LIGHT MOUNT US $9.99
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 UNIVERSAL SHOTGUN BARREL LIGHT AND LASER MOUNTS US $12.87
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 WINCHESTER 1300 METAL BARREL CLAMP SLING SWIVEL MOUNT US $12.99
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 REMINGTON 1100 & 11-87 METAL BARREL FLASH LIGHT MOUNT US $12.99
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 BARREL MOUNT NEW SHOTGUN TRI-RAIL LAZER MOUNT US $17.09
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 UTG Single Picatinny/Weaver Rail w/ 5 Slots Rifle Barrel Clamp Mount MNT-BR005S US $16.50
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 TACTICAL SHOTGUN TRI-RAIL BARREL MOUNT US $16.95
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 Tactical Quad Rail Barrel Mount US $9.90
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Precision Injection Molding --- The concept of precision injection molding and specific requirements for plastic injection molding machine.With development of information technology and automatic control technology, the market for precision injection molding machines have higher requirements, and the amount of demand is also growing fast.
General precision injection molding machine has two indicators: first error is repeated the product dimension, and the other is wrong to repeat the production weight. The first is difficult to compare because various sizes and thickness. The latter represents the plastic injection molding machine of the union. A common mistake repeated injection molding machine weight is about 1%, a better car could reach 0.8%, precision injection molding machine is less than 0.5%, and this is called ultra-precision machine when the error is less than 0.3%.
Specific requirements in precision molding machine:
≦ 0.03 mm opening, closing ≦ 0.01
The focus of precision injection molding technology:
In precision injection molding process, machine usually requires a higher injection pressure (> 250 MPa), or it would be hard to shed. However, since, in general, note precision injection molding products have relatively small dimensions and thickness, so that not all products have demand high for clamping force. On the other hand, if the clamping force is too large or uneven in the four corners, or unstable, it will lead to uneven molding in the mold and then ultimately affect the quality of the product spilled. Precision injection molding clamping force adjustment process requires reasonable, appropriate and accurately, overcoming the length and size caused by Clamping unit deformation force and the problem of unstable force attack caused by room temperature and mold temperature changes.
Uniformity The plasticizing not only affects product quality molding, but also affects the flow resistance when melting plastic through the gate. In order to get a uniform plasticizing, it is necessary to design special screw and technology plasticization. In addition, the barrel temperature should be controlled precisely.
To make the plastic product has a stability high injection plastic injected into the cavity must always be equal, that means the reset screw accuracy When feeding should be the same. But in fact, reset screw positions are not able to keep the same fully larger diameter of the screw, the larger the inertia system, and more difficulty to control the accuracy position. We generally check the accuracy of screw reset to 0.3 mm, 0.2 mm perfectly.
Injection speed is an important indicator in precision injection molding machine as there is a change of time from start hot melting plastic injected into the cavity end injection. During this time, the hot plastic melt cold start, to make the material at the gate and cavity uniformly cool the mold, it should choose high-speed injection. And improve injection speed, you should configure one or more accumulator which will release energy quickly to shorten the time difference. It is useful for precision injection molding to improve the original injection speed more than 3 times, reaching 300 ~ 800 mm / s.
Precision injection molding requires a lot of pressure to increase the density injection plastic, reduce shrinkage, and to ensure precision product. However, the injection pressure is greater and better, the pressure will flash. In the injection well pressure, injection cycle time should not be more than 0.05 seconds.
Holding pressure has a major impact on precision plastic. Accuracy, keeps pressure can make a nice nutrition, reduced plastic deformation and control of precision product. Stability of pressure to bear accurately determine molding, static end position to determine the effect of screw retention.
For precision injection molding, temperature The mold cavity must be controlled to ± 1 ℃, which must use PID control. But for ultra-precision injection molding, it is not is sufficient, more advanced method is to use FUZZF control (fuzzy control).
Plastic Injection Molding Machines' manufacturer - Dakumar is one of the Chinese leading innovator for plastic molding machine's researching and developing.
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