白小姐四肖必选一肖四不像

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Grinding of light flakes and double-sided light flakes

人气: Article Source: Unknown Popularity: 发表时间:2018-12-24 -Published time: 2018-12-24
Key words:   Carborundum prices
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Coarse and fine polishing operations General ore polished pieces are polished only once, and some hard and tough samples require two polishing steps to achieve the highest quality.
The disc surface materials and polishing materials used for rough polishing are: rubber, alumina or silicon carbide and iron oxide with 1-1.5 micron abrasive; canvas and abrasives with iron oxide or oxide decoration; woolen cloth, abrasives with heavy acid Chromium. The rotation speed of the grinding disc is preferably 400-600 rpm.
Fine polishing disc surface materials and polishing materials can be selected: ① gold velvet or cotton velvet, the abrasive is dichromic acid plus chromium oxide; ② rubber, the abrasive is chromium oxide, iron dichromate.
When using rubber as a rough polishing disc, a rough polishing suspension made by mixing iron oxide with a small amount of dichromate and water is also effective. The time for rough polishing a light sheet generally does not exceed half a minute to one minute. Soft mineral deposits are directly polished without rough polishing, which takes about the same time as rough polishing. Fine polishing of harder deposits takes 1-2 minutes. For the fine grinding and polishing of diamond, corundum and ruby, it is necessary to use diamond grinding paste—a mixture of diamond powder and oil; oil can be thin oil (mixed with kerosene) or glycerin. Water-soluble samples use iron oxide (or iron oxide) plus a thin oil mixture as a polishing solution, and are polished on a rubber polishing disc, and the effect is also very good.
During polishing, the samples must be constantly changed in orientation, and moved back and forth on the disc in the direction of the flat diameter of the polishing disc. High hardness ore deposits can be appropriately strengthened, and the number of polishing materials can be added more frequently, about once every 20 seconds. Softer mineral deposits should be lightly polished and less polished. The polishing pad must adhere to a certain amount of water. The effect is unsafe when it is too boring. It is necessary to avoid the inclusion of coarse sand and affect the quality.
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