Shell structure and processing method of a core-pulling floor spring

Abstract

The invention relates to a core-pulling-type floor spring casing structure and a machining method thereof. A machining flow of the casing structure includes arranging an aluminum ingot into a gas stove crucible to melt the aluminum ingot, installing a die on a die-casting machine, evenly coating a release agent on core-pulling modules (A, B and C) of a workpiece, conducting die assembly operation, pouring and injecting molten aluminum into the die in a press mode, opening the die after pressurizing, ejecting the core-pulling module A out of the molded workpiece first, then ejecting the core-pulling modules (B and C) out of the molded workpiece, and finally conducting follow-up repairing operation on the workpiece. The casing structure and the method have the advantage that a three-core-pulling method is adopted to first eject out the core-pulling module A to reduce internal stress, then the core-pulling module B is ejected out, a fixing plate adopts a thread locking connection mode, a cavity formed in an installation hole is regular in shape, a cam shaft and the fixing plate can be installed conveniently, coaxiality errors of the upper fixed portion and the lower fixed portion of the cam shaft are small, and the cam shaft is high in verticality, flexile to rotate and not easy to block.

Description

technical field [0001] The invention relates to a floor spring, in particular to a shell structure of a core-pulling floor spring manufactured by a three-core-pulling die-casting process and a processing method thereof. Background technique [0002] Floor spring is also a kind of door closing equipment, which is widely used in public places such as office buildings, shopping malls, restaurants, and exhibition halls. The floor spring can be used for two-way open doors, and the door closer is generally used for single-open doors. The technical key of the floor spring lies in the bearing seat under the main shaft, which determines the load-bearing level of the floor spring, because the floor spring of the two-way open door has to bear the weight of the door. Compared with the weight of the door closer, the floor spring plays a decisive role. The door width and air pressure are also very important for the selection of the floor spring model. From the perspective of production, t...

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Problems solved by technology

[0004] The invention mainly aims at the problems of poor sealing, easy oil leakage, inflexible rotation of the camshaft and easy jamming existing in the existing floor springs, and provides a core-pulling type spring with good sealing, no oil leakage, and flexible rotation of the camshaft. Shell structure and processing method of floor spring

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