4 results about "Medium pressure" patented technology

The invention discloses an aluminum alloy special-shaped pipe ultralow temperature medium pressure forming method. Through the characteristic that the forming performance of an aluminum alloy pipe material under the ultralow temperature condition is substantially improved, the pipe material is subjected to cooling and pressurizing in a mold through an ultralow temperature medium, and thus, the pipe material is formed into a special-shaped pipe at the ultralow temperature. According to the aluminum alloy special-shaped pipe ultralow temperature medium pressure forming method, the ultralow temperature medium is used for cooling the mold and the pipe material and meanwhile conducting pressurizing so that flexible loading of the pipe material can be achieved, and the complex special-shaped variable cross-section pipe can be formed advantageously; through the characteristic that the forming performance of the aluminum alloy pipe material under the ultralow temperature condition is substantially improved, cooling and pressurizing are conducted through the ultralow temperature medium, the pipe material is deformed under the ultralow temperature condition, the forming performance is substantially improved, and the situation that the aluminum alloy special-shaped pipe large in cross section difference is cracked during hydraulic forming is avoided; and the forming performance of the welded seam zone of an assembled welding pipe and the forming performance of parent metal are both substantially improved, the plasticity coefficients are approximate, and the problem that the welded seam zone of the large-diameter aluminum alloy special-shaped pipe is cracked is solved.

The invention discloses a method for crimping a high-pressure cross-linking three-layer co-extrusion continuous produced disc-exchanging conductor. The method specifically comprises the following steps: forming head and tail connecting sections with the outer diameter being less than the compressing outer diameter of a conductor after removing layers from a head end of one coil of conductor and a tail end of the other coil of conductor; preparing an iron pipe with the outer diameter being approximate to the compressing outer diameter of the conductor and with the inner diameter slightly being more than the outer diameter of the connecting sections, according to the compressing outer diameter of the conductor; inserting the head connecting section of one coil of conductor and the tail connecting section of the other coil of conductor into inner holes at two ends of a steel pipe; placing into a cavity of a 10-ton hydraulic press and crimping the iron pipe; and crimping the surface of the iron pipe for ten times, thereby causing the conductor therein to be in close contact with an inner wall of the iron pipe. According to the method provided by the invention, the cold pressing welding is applied to the disc-exchanging and connecting of the high-pressure cross-linking three-layer co-extrusion conductor; only an iron crimping pipe and a manual hydraulic mould which are conveniently taken are selected and used; the iron crimping pipe is connected with two ends; compared with a resistance butt-welding connecting method, the method has the advantages that the operation is simple and the success rate is higher; and the once investment in equipment according to the method is reduced by above 30% of the once investment in equipment according to a resistance butt-welding scheme.

The invention discloses a left and right convex-mold die-forging process, which comprises an upper concave mold, a lower concave mold, and a multidirectional die-forging oil press, further comprises a left convex mold and a right convex mold. The process comprises the following steps of step A preheating the upper concave mold, the lower concave mold, the left convex mold and the right convex mold by using a heater; step B placing a forged-piece material in the lower concave mold, and introducing a low pressure into the multidirectional die-forging oil press to enable the upper and lower surfaces of the forged-piece material to be positioned and molded; step C continuously introducing a high pressure into the multidirectional die-forging oil press to enable the upper concave mold to be pressurized and kept to be pressed with the lower concave mold; step D then introducing a medium pressure into the multidirectional die-forging oil press to enable a convex-mold body to be pressed into the forged-piece material to finish the die pressing, positioning and molding of the left and right lateral surfaces of a forged piece; step E sequentially removing the medium pressure and the low pressure of the multidirectional die-forging oil press, and taking out the forged piece to obtain a finished-product forged piece. The left and right convex-mold die-forging process has the advantages of simplicity and rapidness in operation, good applicability and strong practicability, and the molding of the forged piece in a complicated structural shape can be effectively finished, so that the utilization ratio of the material is markedly increased, and the forging cost is lowered.