Insert reinforced nylon pipe pliers and manufacturing method

Abstract

The invention relates to a hand tool and a manufacturing method, in particular to pipe pliers and a manufacturing method. The pipe pliers comprise a movable jaw, a fixed jaw, an adjusting nut and a pliers handle. The pipe pliers are characterized in that: the pliers handle consists of glass fiber reinforced polyamide 66 and an insert embedded into the glass fiber reinforced polyamide 66; the insert is in a symmetric structure and is designed in transverse H-shaped variable section and equal strength along the axis of the pliers handle, the insert has reinforcing effect on the stress concentrated section of the pipe pliers, and the rigidity and the strength of the nylon pliers handle are reinforced; a web plate at the transverse H-shaped part of the insert is provided with multiple holes, and nylon is filled into the holes during injection molding, so that the bonding strength of the insert and the nylon can be reinforced and tearing is prevented during working; the insert can be conveniently positioned in a die during injection molding and machining; and the manufacturing method comprises the following steps of: insert casting or profile blanking, insert de-burring and filleting, surface treatment such as insert shot blasting and the like, insert coupling treatment, insert preheating, positioning and assembly of the insert in the die, injection molding, cooling, boiling, spraying, pipe pliers assembly and detection.

Description

technical field [0001] The invention relates to a hand tool and a manufacturing method, specifically a pipe wrench and a manufacturing method. The handle body of the pliers is composed of glass fiber reinforced polyamide 66 and an insert embedded in it, which strengthens the stress concentration section of the pipe wrench. And a specific manufacturing process is adopted to ensure that the pipe wrench has sufficient rigidity and strength. The invention provides an industrial standard pipe wrench with simple structure, high strength, low cost, light weight, crack resistance and easy operation. Background technique [0002] Pipe wrench is an essential tool in pipeline installation, and it is also a commonly used tool in other industries such as machinery, shipbuilding, and chemical industry. At present, the commonly used German and American pipe wrench handles are cast from metal alloys. This kind of pipe wrench handle has high strength, but there are problems such as high pro...

AI Technical Summary

Problems solved by technology

At present, the commonly used German and American pipe wrench handles are made of metal alloy casting. This kind of pipe wrench handle has high strength, but there are problems such as high production cost, heavy pipe wrench, no insulation, and not conducive to cold weather operation.

If the pliers handle is made of nylon injection molding, the pliers handle will break due to stress concentration, and the nut will easily collapse the nylon during work. If an insert is added to the pliers handle body, due to the coupling problem between the pliers handle and nylon cracking, causing the handle to fail

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