Some knowledge points of ceramic plunger
Ceramic plunger is mainly used in textile, petroleum, chemical, food industry plunger machinery, instead of metal plunger, to solve the problem of poor corrosion resistance of metal plunger, low working temperature caused by the short life of the equipment. Ceramic plunger products have high wear resistance, corrosion resistance and specified thermal shock resistance, and the service life is 5-10 times that of metal plungers. It not only improves the output but also saves the cost.
Defects in the use of ceramic plunger:
(1) The ceramic has cracking phenomenon, which is not easy to find in the ceramic manufacturing process, but when the plunger is working, due to pressure
The role of the crack is getting bigger and bigger, resulting in the scrap of the workpiece.
(2) The ceramic tube falls off from the stainless steel.
(3) The ceramic surface finish is not enough, resulting in increased friction resistance and reduced production efficiency.
(4) The overall concentricity of the plunger is not good, resulting in reduced equipment efficiency.
Ceramic plunger manufacturing process in each process must strictly comply with the following provisions:
(1) The cracking phenomenon of ceramic bodies is often related to the choice of raw materials, so we must start with ceramic raw materials and strictly screen. Screening principle: to have a certain degree of fineness, especially good consistency, according to the normal distribution of small values.
(2) When the high-pressure grouting method is used, the gypsum mold cavity must be filled at one time during the grouting process, and no slurry or grouting shall be carried out more than twice. In the grouting process, the speed must be appropriate, so as to avoid the formation of pores too fast, the formation of faults too slow and hardening, resulting in cracking of the body, or the formation of internal stress. The speed generally depends on the product, the general control speed into the line, the grouting is not interrupted.
(3) grasp the timing of demoulding. When the cast product has a certain strength in the plaster mold, it can be demoulded. In the demoulding process, be careful not to exert force, but to handle it gently. Pay special attention to the mold marks, there can be no cracking phenomenon. Once there is any cracking phenomenon, the ceramic will crack after forming.
(4) The body must be naturally dried in a cool and ventilated place to prevent excessive drying from causing internal stress to crack the ceramic body. If the blank is defective, it must be treated as scrap, and the blank cannot be filled and repaired with slurry.
(5) In the firing process, the heating curve should be strictly observed, especially the holding time should be long, which can increase the crystallinity of the ceramic and improve the grinding process.
(6) The manufacture of the top pin hole is of great significance in the entire product manufacturing process and is the basis for the concentricity and flatness of the entire product. The pin hole must be completely consistent with the thimble and must be polished to achieve the effect.
(7) The ceramic body and the stainless steel body are filled with resin glue. When the glue is solidified and has a certain strength, the outer circle is processed.
(8) After grinding, use an internal polishing machine to polish the ceramic plunger to the specified size. Before polishing, the vibration of the machine tool, the proportion of the polishing liquid and the beating of the workpiece must be strictly controlled to make qualified products.
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2024-01-02
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