Expanding die for expanding head of longitudinal welded pipe and manufacturing process of expanding die

Abstract

The invention discloses an expanding die for an expanding head of a longitudinal welded pipe and a manufacturing process of the expanding die, and relates to the technical field of dies. The expanding die for the expanding head of the longitudinal welded pipe comprises an upper die and a lower die. The upper die is arranged above the lower die in a covering manner, semicircular grooves are formed in the middles in the upper die and in the lower die, meanwhile, the two semicircular grooves are combined to form a cavity, channels are symmetrically formed in the positions, located on the two sides of the cavity, in the upper die and the lower die, the two channels are connected to the two ends of the cavity correspondingly, so that the cavity communicates with the two channels, ball grooves distributed in the horizontal direction in the equidistant direction are formed in the tops and the bottoms of the inner walls of the two channels, and balls are movably installed in the ball grooves. According to the expanding die, point contact between the balls and the longitudinal welded pipe replaces surface contact between the longitudinal welded pipe and the die, wear of the surface wall of the longitudinal welded pipe is effectively reduced, and the expanding die is beneficial to improving the expanding quality and efficiency of the longitudinal welded pipe.

Description

technical field [0001] The invention belongs to the technical field of moulds, and in particular relates to a diameter-expanding die of a diameter-expanding head of a straight seam welded pipe and a manufacturing process thereof. Background technique [0002] Molds are various molds and tools used in industrial production for injection molding, blow molding, extrusion, die-casting or forging forming, smelting, stamping and other methods to obtain the required products. In short, a mold is a tool used to make shaped objects. This tool is composed of various parts, and different molds are composed of different parts. It mainly realizes the processing of the shape of the object through the change of the physical state of the formed material. However, in the process of expanding the diameter of the straight seam welded pipe, a supporting mold is usually required so that the diameter of the straight seam welded pipe can be expanded through the diameter expanding head, and the pro...

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Problems solved by technology

[0003] However, the expansion dies for straight seam welded pipe expansion heads currently on the market have the following defects in use: (1) The surface wall of the straight seam welded pipe is prone to friction with the inner wall of the channel of the mold, which easily causes the surface of the straight seam welded pipe to wear, And it is not convenient for the rapid insertion of straight seam welded pipes; (2) when the mold is clamped, it cannot be positioned quickly and accurately, which affects the mold clamping efficiency of the mold; It affects the use of the mold, and affects the diameter expansion quality of the longitudinal welded pipe. At the same time, if the scale is removed from the mold, it is time-consuming and labor-intensive, which increases the labor intensity of the workers; (4) The existing production process has low production efficiency and produces The mold has insufficient strength, wear resistance and impact toughness, which affects the use of the mold

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