1. Processing:
(1) The injection pressure and speed are too low, and the temperature of the barrel and the mold temperature are too low, so that the melt entering the mold is cooled prematurely and a weld seam occurs.
(2) When the injection pressure and speed are too high, a spray will occur and a weld seam will appear.
(3) The rotation speed should be increased, and the back pressure should be increased to decrease the viscosity of the plastic and increase the density.
(4) The plastic should be dried well, and the recycled material should be used less. If the amount of the release agent is too much or the quality is not good, the welded joint will appear.
(5) Reduce the clamping force and facilitate the exhaust.
2. Mold aspect:
(1) If there are too many gates in the same cavity, the gate or symmetrical setting should be reduced, or as close as possible to the fusion joint.
(2) Exhaust system should be opened if the exhaust at the weld joint is poor.
(3) If the sprue is too large and the pouring system is not properly sized, the gate is opened to avoid the flow of the melt around the insert hole, or the insert is used as little as possible.
(4) If the wall thickness changes too much, or the wall thickness is too thin, the wall thickness of the part should be uniform.
(5) If necessary, a fusion well shall be opened at the weld seam to disengage the weld joint from the workpiece.
3. Plastics:
(1) Lubricants and stabilizers should be added to plastics with poor fluidity or heat sensitivity.
(2) Plastics contain a lot of impurities, and if necessary, change the quality of the plastic. Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
Grinding And Polishing Equipment
Cutting is the first step of material analysis. The selection of cutting machine and cutting wheel must comply with the geometric size and material characteristics of the sample. The perfect metallographic cutting should avoid microstructure thermal damage and deformation, and preserve the necessary accuracy and efficiency.Hardness and ductility are the two main parameters for selecting the cutting wheel. The best choice of the cutting wheel depends on the size, hardness and ductility of the material and the equipment used. Trojan's cutting products speak with facts and the cutting process is simple, fast and accurate.
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