3results about How to "Excellent machinability" patented technology

The utility model discloses a lead-free environment-friendly copper alloy bar for a valve, which comprises a lead-free copper alloy bar body, a hollow hole is arranged at the center of the lead-free copper alloy bar body, a plurality of inclined planes are arranged on the surface of the lead-free copper alloy bar body at equal intervals, an anti-corrosion paint layer is arranged on the surface of the lead-free copper alloy bar body, and the anti-corrosion paint layer is arranged on the surface of the lead-free copper alloy bar body. The lead-free copper alloy bar has the advantages that through the arrangement of the hollow holes, the weight of the lead-free copper alloy bar body is reduced, meanwhile, enough strength is kept, meanwhile, resistance and thermal resistance are reduced, and the electric conduction efficiency and the heat conduction efficiency are improved; the copper alloy material is low in cost, low in cost and free of lead and chromium, meets international environmental protection standards, reduces potential hazards to the environment and human bodies, keeps high strength, high toughness and good machinability of a traditional copper alloy, and is suitable for manufacturing various valve parts.

This utility model provides a fabric cutting device for an overlock sewing machine based on a composite cutter. The fabric cutting device includes a movable upper fabric cutting blade, a fixed lower fabric cutting blade, and a cutting blade driving mechanism. The upper fabric cutting blade includes an upper blade base and an upper blade shearing part fixed at the lower end of the upper blade base. The lower end of the upper blade shearing part is provided with an upper blade edge and an upper blade guide limiting part extending downward from the tail of the upper blade edge. The upper blade shearing part is made of cemented carbide. The lower fabric cutting blade includes a lower blade edge at the top. The hardness of the material of the lower fabric cutting blade with the lower blade edge is lower than that of the upper blade shearing part. During the process of the cutting blade driving mechanism to engage the upper and lower fabric cutting blades, the upper blade guide limiting part is close to one side of the lower fabric cutting blade, and at least a portion of the part of the lower fabric cutting blade that is close to the upper blade guide limiting part is made of cemented carbide. This application effectively extends the service life of the upper and lower fabric cutting blades, reduces the operating cost, and improves the fabric cutting effect.

The application discloses a cerium-containing austenitic free-cutting steel and a preparation method thereof. The cerium-containing austenitic free-cutting steel contains, in percentage by mass, 0.1-0.4% of C, 1.5-2.0% of Mn, 0.1-0.3% of Si, 6.0-8.0% of Ni, 15.0-17.0% of Cr, 0.1-0.2% of Mo, 0.1-0.5% of S, 0.001-0.3% of Ce, and the rest is Fe and inevitable impurities. The cerium element is reasonably added in the austenitic free-cutting steel, the morphology, size, length-width ratio and distribution of sulfides in the free-cutting stainless steel are effectively controlled and improved, the free-cutting stainless steel has not only good cutting performance, but also very good mechanical properties.