4results about How to "Qualified performance" patented technology

The application discloses a method for producing large-size high-carbon chromium bearing steel rod with small compression ratio, which comprises continuous casting and continuous rolling processes, wherein the continuous casting process comprises the following steps: full-process protection pouring, the temperature of the molten steel in the tundish is 1465-1485 DEG C; the current of the electromagnetic stirring of the crystallizer is 330-350 A, and the frequency is 3-4 Hz; the current of the electromagnetic stirring of the secondary cooling end is 340-360 A, and the frequency is 8-9 Hz; the drawing speed of the continuous casting billet is 0.8-1.0 m / min, the solidification is carried out through secondary cooling, and the secondary cooling intensity is 0.2-0.3 L / kg; the center porosity of the obtained continuous casting square billet is not more than 2.0 level, the center shrinkage hole is not more than 1.5 level, and the cross-section size is 197-205*197-205 mm 2 ; the continuous rolling process comprises the following steps: the continuous casting square billet is loaded into a steel rolling heating furnace for heating; the continuous casting billet is discharged into a rough rolling machine after being heated, and the outlet speed of the finished product with a round steel φ70-90 mm specification is 0.90-1.5 m / s; and the round steel with a diameter of 70-90 mm is rolled. The method can produce large-size rod with small compression ratio, expand the production capacity of equipment, and improve the utilization rate under the existing process equipment.

The utility model discloses a kind of furnace soot-blowing devices for vertical furnace, including box, the inside of box is provided with guide rod one and guide rod two, guide rod one is equipped with guide sleeve one, guide rod two is equipped with guide sleeve two, and it is connected with blowing pipe between guide sleeve one and guide sleeve two, blowing pipe is equipped with nozzle, nozzle is aligned in the heat exchanger inside the box and is purged, dust produced by purging is collected by the dust collector below and is excluded, and the right side of blowing pipe is communicated with access pipe and internal thread pipe, and internal thread pipe is equipped with screw rod, access pipe is communicated with air pipe joint by hose, and air pipe joint is arranged at the bottom of purging device, the utility model reduces the time of shutdown soot-blowing, saves production cost while ensuring that steel belt performance is qualified.

This invention discloses a method for preparing high-silicon ductile iron castings, belonging to the technical field of high-silicon ductile iron casting preparation, including the following steps: S1: preparing a mold sand mold; S2: preparing casting materials; S3: pouring molten iron-based metal into a treatment bag, and using a spheroidizing agent and antimony alloy for spheroidization treatment to form spheroidized molten metal; S4: transferring the spheroidized molten metal from the treatment bag to a pouring bag, and adding an inoculant equal to the weight of the molten iron-based metal to the pouring bag to form a pouring molten metal; S5: pouring the pouring molten metal into the mold sand mold for molding to form a high-silicon ductile iron casting; through the above method, using silicon solid solution strengthening and antimony-rare earth synergistic spheroidization process, the casting achieves high strength and toughness, and the metallographic structure is mainly ferrite with good structural consistency, meeting the stringent requirements of welded differential housings for new energy vehicles.

This invention relates to the field of welding technology, specifically to a pretreatment method for weldable parts, a composite manufacturing method, and a hot-stamped component. The pretreatment method for the weldable parts includes: before welding the edge of a coated steel plate to be welded, performing a heat treatment to melt the coating on the edge, and immediately extruding away the coating elements from the surface of the edge to be welded, forming a weldable area. This invention uses heat treatment to melt the coating and extrusion to remove the coating elements from the edge to be welded. This invention has high coating removal efficiency, eliminates the need for a pretreatment production line, and eliminates the need for prefabricated specific gaps between weldable edges and special high-alloy welding wire, thereby significantly reducing the cost of tooling fixtures and welding wire and improving welding loading efficiency. Furthermore, it ensures that the weld joint performance is qualified and the quality is stable after heat treatment in mass production.