 Wysłany: Wto 0:47, 24 Maj 2011 Temat postu: mac cosmetics discount 4 |
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| Mold design of plastic parts quality
Taiwan Plastic material to avoid loss of marks or materials, and surface burning. Charred surface may be caused by a bad exhaust. Cup form must take into account the formation of a vacuum when ejection, which should exhaust measures. When using the extension of the main runner, or directly feed material inlet, in the material near the mouth of the formation of abnormal temperature. If less than the stiffness of the template. Will bend at work,ed hardy kleider, which caused flash. Plastic parts produced in the Stripping stress sometimes, mainly putting too small, too much force in the push rod at. Similarly, if the sub-surface dislocation that can not be sealed,ed hardy suomessa, per unit area of clamping force,ed hardy zürich, this time should be high pressure resistant steel. (3) mold temperature control system for precision plastic parts in plastic,mac cosmetics discount, the mold temperature control system the main purpose is to maintain the temperature of the cavity substantially constant. Arrangement of cooling water depends on the shape of the pieces} but it should be symmetrical as possible, especially in multi-cavity mold is more important. When the wall thickness of plastic parts increases, the cooling channel diameter should be increased accordingly. The following is the approximate recommended. The following wall thickness 2ITIm wall thickness 4mm diameter 8 ~ 10m111 the following wall thickness 6mm diameter l0 ~ 12mIT1 l0-16mm diameter less than 100 ℃, mold temperature, you should use oil as a hideous grip. Industrial area should be decorated with marrow 1. __ I ~ attention on three sides of the heat transfer coefficient of oil is less than water (in the same flow rate and the channel diameters), the thermal conductivity in the Re> 3500 suddenly increased. Mold plastic parts can lead to poor temperature control in poor quality. Bu water cross-section diameter is too small or too small, or poor channel alignment. Axisymmetric plane for example, plastic parts, the cooling water can be made into spiral. The Straight of the water was in this case the temperature effect could not be achieved excellent results lead to warping or deformation of plastic parts. Plastic parts in a hole, the hole tolerance is often difficult to guarantee. Core in the hole can be relentless in to cool decision. Standard parts such as core cooling spiral plow bar is very convenient. (4) Mold Injection Mold Damage After a period of time in use, you will find in the sliding part of the core and sub-items appear on the fight wear. The results will lead to the generation of dislocation or flash, so the size of plastic parts are so out of State bias. When filling time, often near the feed inlet wear or corrosion of the wizard, the Department should adopt anti-friction materials and easy to replace when asked to use a long touch with, often occurs cough exhaust blocked ills. Some plastics molding produces volatile, these volatiles will be actively attached to the cavity wall. In this case, you should clean it, leek should become a regular job. As mentioned above, the various pieces of scrap plastic mold makes the situation together as shown in Table 3 defects caused by the mold plastic parts have been scrapped in Table 3. Even so, more important is the injection machine and injection process parameters. R can be of high quality plastic injection machines from plastic and die relations between the proper balance can be achieved. Preface Table 3 Typical causes the plastic parts with Tan scrap parts defective {case may be according to his wife across the nose with the heir tangled ---------___----___。 _-. ---- _-● ● ___H_. -. ___---_。 . . _ '. . One by one - Canton --------- ■ a 'drive [cavity size offset part of the dislocation f t scale dynamic model Mother shrinkage can conceal improper wall of I-Kui Chen-hsiang l Noir plot wear. Axial misalignment, improper design into the mouth Division I ordered adverse f cooling water deviation angle, warp-centering guides wear holes forming crack-free transition arc poor or no cooling cooling adverse local strain, has pit cavity I parietal injury is a type of surface accumulation of bad things I ju I cavity control gradient without stripping; flow marks Inlet disheartened by the poor location f mold control adverse holding the gas shortage. Loss Branch, brown bad putting gas holding area is too small f oblique ejection through a small deformation. I die deflection in flash positioning bad mold parts; I die La loose pieces lack. Zhang Long Quoted [njectionMould1988VDI Edition Multi-corner container tube drawing die design pigsty cylinder automatic re-drawing of the container has been, Romanowskl formulas of pigsty process design manufacturing tube container played an important role in the scene, but because of its formula to the mold shape the design of range wide,mulberry norge, it is difficult to determine the primary value, and for the shape of the container design also has limitations, Japanese scholars Kuwabara Toshihiko so under the slip line field theory and the recent Iseki made on cylindrical containers multi-stage drawing simulation group units, proposed four corners with industrial 1991. No. 2 total of 120 sections of the container tube drawing die of automatic programming, the corners of our hot mold tube container pull the development of automatic programming, provides the latest methods. 2 Figure 1 shows the basic assumptions multi-stage processing method drawing concept maps. The first n-1 containers procedure n-tip shape and mold procedure matches the shape flange inclined plane sets, the first to be added 相关的主题文章： abercrombie milano l} di 0 christian louboutin ' ed hardy shop wien 10 |
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