In recent years, in order to alleviate the resource crisis, our province has implemented a strategic breakthrough in prospecting and focused on finding bauxite under the coal seam. Among the 88 self-contained exploration areas currently under the province, 15 coal-under-aluminum projects have been underway, while the Cao kiln in the Dianchi County has been surveyed by the West Coal under aluminum assembly project. Currently, 33.8 million yuan of exploration funds have been invested. The drilling engineering volume was 479.51 million meters, and 195 drilling holes were started. Among them, 97 holes saw bauxite, 25 holes saw iron ore, and 26 holes saw clay mine.
A good Bi-metal Hole Saw will cuts faster and smoother and with reduced vibration due to the variable pitched teeth, hole saws have two different types of steel joined together to form the edge of the cutting end of the Hole Saw. High speed steel is joined to a soft spring steel to form a durable edge that will cut a multitude of materials and help provide long life. High speed steel is used on the outer edge due to its wear resistance properties and forms the cutting edge of the teeth. Soft, spring steel creates a flexible backing material that allows the hole saw to absorb impacts of the job of drilling holes in difficult-to-cut materials.
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