Abrégé

Disclosed in the present invention is an integrated tube rows connecting block instead of tubes bending parts in power station boiler, which comprises a distributary channel, a single-flow channel and an X-shaped connecting block with X-shaped longitudinal section arranged in lateral configuration. The four top corners of the X-shaped connecting block transversely form four horizontal top corner lines. Multi-group composite channels are arranged from left to right in the X-shaped connecting block. The outlets of the composite channels are uniformly distributed on four horizontal top corner lines of the X-shaped connecting block and form an upper-front row interface (1), an upper-rear row interface (2), a lower-front row interface (4) and a lower-rear row interface (3) respectively. The integrated tube rows connecting block has the advantages of reasonable space utilization, which ensures that the wall thicknesses between channels corresponding to the prior tubes bending parts are thickened at least 50 percent and maximally ensures tube rows safe operation so as to avoid stress concentration trouble and explosion of this position. The integrated tube rows connecting block also has the advantages of convenient maintenance which eliminates the maintenance bottleneck and convenient welding and assembly with 100 percent through ball rate.

Classes IPC  ?

• F22B 37/00 - Détails ou parties constitutives des chaudières à vapeur

Abrégé

A die forging method for collector ring fan involves the following steps: with the initial forging temperature of 1100 DEG C, the final forging temperature of 850 DEG C and forging pressure of 6×106Kg, forging out a collector ring fan blank body by one-step molding; annealing in a furnace-cooling manner; rising the temperature to 940 plus or minus 10 DEG C from the temperature of a furnace of 400 DEG C, and carrying out tempering treatment after a workpiece is cooled to be below 100 DEG C, the tempering treatment is air-cooling below 640 DEG C; machining a fan blade channel by a numerical control vertical lathe; and finish machining. The collector ring produced by the forging method has tensile strength Rm of 800-1000MPa, yield strength Rp0.2 greater than or equal to 700MPa, elongation A4 greater than or equal to 12 percent, reduction Z of cross section greater than or equal to 40 percent and the impact power AKV greater than or equal to 40J, therefore, the mechanical performance is improved and the service life is prolonged.

Classes IPC  ?

• B21J 5/00 - Méthodes pour forger, marteler ou presserÉquipement ou accessoires particuliers
• H01R 43/10 - Fabrication de bagues collectrices

Abrégé

A forging backward-extrusion process for making a tee-pipe comprises the steps of: (1) extrusion of a forged bar: heating the forged bar to a forging temperature according to its material, horizontally placing the forged bar at the position corresponding to a main pipe in a tee-pipe forging die, synchronously extruding and perforating the two ends of the forge bar by two top cylinders, thus forming the main pipe and a projection on the main pipe in the forging die at the same time; (2) performing backward-extrusion and perforation by an upper top cylinder: using the upper top cylinder to perform backward-extrusion and perforation downwards from the upside of the projection, thus forming the tee-pipe. The present invention can ensure the surface smoothness of the pipe, reduce the energy consumption and improve the production efficiency by applying an integral forging die and performing one-time heating. Furthermore, the present invention increases the height of branch pipe by 30-60 percent than that of the prior art, so as to make welding and shooting process convenient.

Classes IPC  ?

• B21C 23/20 - Fabrication de produits non revêtus par extrusion inversée
• B21C 25/02 - Matrices

Abrégé

A preparation process for a forged elbow includes (1) forging a pipe punching a forged rod to a forged pipe after fixing the forged rod. wherein the eccentricity (5) of the forged pipe is 4 to 6 percent of wall thickness of the finished elbow, (2) bending a pipe bending the forged pipe to form an elbow by utilizing the thinner semi-circular pipe wall of the forged pipe as an inner ring (1) of the elbow and the thicker semi-circular pipe wall as an outer ring (2) of the elbow after heat treatment. The process can provide an elbow with relatively uniform wall thickness of the inner and outer rings.

Classes IPC  ?

• F16L 9/02 - Tuyaux rigides en métal
• F16L 43/00 - CoudesSiphons
• B21K 1/14 - Fabrication d'éléments de machines de raccords ou garnitures

Abrégé

A hot-forging shaping process for a joint hinge comprises the following steps: (1) heating a blank to 1050~1150℃ by an intermediate frequency furnace; (2) upsetting the heated blank slightly by a pneumatic hammer to remove the oxide scale on the surface of the blank; (3) forming the unfolding sheet of the joint hinge by the pre-forging die of a friction press; (4) then forming the joint hinge by the finish-forging die provided with a V-shaped concave die of a friction press; (5) truing the joint hinge by a hydraulic truing machine; and (6) shot blasting the joint hinge by steel shots in order that the forged joint hinge appears silvery white. The hot-forging process for a joint hinge through single heating has advantages of high efficiency and low cost, and the oxide scale is thin, so it can be removed before forging, therefore attaining excellent surface quality. The forged joint hinge appears silvery white after shot blasting, which facilitates surface inspection of the forged joint hinge.

Classes IPC  ?

• B21K 1/74 - Fabrication d'éléments de machines de pièces fourchues ou pièces à plusieurs branches, p. ex. étriers en U, ancres
• B21J 5/02 - MatriçageÉbarbage par utilisation de matrices particulières
• B21J 13/02 - Matrices ou leurs montures

Abrégé

An U-shaped bifurcated pipe integral-forming process includes the steps of: (1) heating a blank in a medium-frequency furnace to 850-1200 degrees centigrade, (2) forging the blank after medium-frequency heating to a Y-shaped bar by Y-shaped forging dies, (3) drilling the Y-shaped bar to form a Y-shaped inner channel by a drilling device, (4) bending the V-shaped head of the Y-shaped bar to U shape to form the U-shaped bifurcated pipe. The present invention utilizes the die forging and extruding technology to form the U-shaped bifurcated pipe, so that the pressure resistance of the U-shaped bifurcated pipe is far excessive to that of the welded bifurcated pipe, and the production cost is low.

Classes IPC  ?

• B23P 23/04 - Machines ou agencements de machines réalisant des combinaisons déterminées de différentes opérations d'usinage, non couverts par une seule autre sous-classe pour effectuer l'usinage ainsi que les autres opérations de travail du métal
• B21J 5/02 - MatriçageÉbarbage par utilisation de matrices particulières
• B21K 1/76 - Fabrication d'éléments de machines d'éléments non mentionnés dans l'un des groupes précédents