2results about How to "Guaranteed deflection" patented technology

The present invention relates to a yttrium oxide-based composite ceramic crucible for niobium-based alloy smelting and a preparation method thereof. The technical scheme is: yttrium oxide powder and titanium carbide powder are blended, ball-milled, and dried to obtain a composite powder; cold isostatic pressing is then performed to obtain a crucible blank; vacuum induction sintering is performed on the crucible blank to obtain a crucible base; the crucible base is dried, placed in hyperbranched polycarbosilane, maintained under vacuum and high pressure conditions, solidified, and high-temperature cracked at 1200-1400°C in an argon atmosphere; the pretreated crucible base obtained by high-temperature cracking is embedded in a silicon powder-calcium chloride composite powder, and sintered in a vacuum induction sintering furnace at a vacuum degree of 10 ‑3 ~10 ‑2 MPa and 1700-1900℃, the yttria-based composite ceramic crucible for niobium-based alloy smelting is obtained. The product not only has excellent fracture toughness, good thermal shock stability and excellent resistance to alloy melt erosion, but also has a long service life and high alloy melt cleanliness.

A fixture device for machining Niemann worm gears using seven-axis five-linkage CNC milling includes a fixture support friction-reducing disc. An oil spraying lubrication assembly is floatingly and fixedly mounted on the upper surface of the fixture support friction-reducing disc. The lower surface of the oil spraying plate has multiple through holes. A clamping assembly is fitted onto the fixture support friction-reducing disc through these through holes, facilitating high-speed rotation around the central axis following the friction-reducing disc. A lifting column assembly is fixed to the oil spraying lubrication assembly, a tailstock support assembly is fixed to the lifting column assembly, and a circumferential limiting assembly for the oil spraying plate is fixed to the ground inside the machine tool's working chamber. This invention is used for milling Niemann series worm gears on a seven-axis five-linkage CNC machine tool, ensuring smooth side milling and preventing worm gear deformation. The adjustable length of the lifting column assembly and tailstock support assembly allows the fixture to adapt to the machining of worm gears of various geometric sizes and shapes, highlighting the adaptability and versatility of the fixture for vertical milling of worm gears.