Machining process for metal flow guide nozzle of oil tank

Abstract

The invention discloses a machining process of an oil tank metal diversion nozzle. Relates to the technical field of automobile part production. On the premise that the quality is ensured, metal material shaping machining can be continuously carried out, the process continuity is high, the process cost is reduced, manpower is saved, and the production efficiency is improved. Comprising a blanking process and a round sheet blank manufacturing process, and further comprises the following processes: (1) at least two times of stretching processes; (2) a flash cutting procedure; (3) at least one time of inner and outer surface synchronous thread shaping process; (4) a nozzle hole treatment procedure; (5) shaping; and (6) bright annealing treatment is completed. Continuous stations are arranged on one press machine to conduct automatic continuous plate forming machining, the flow guide nozzle outer wall thread forming die unit is adopted to conduct synchronous inner surface expanding and outer surface buckling operation, and thread forming is completed under the face contact condition. According to the machining process, the production efficiency is high, heat treatment is conducted after finished product shaping is completed through continuous machining operation, procedures are saved, and the working efficiency is greatly improved.

Description

technical field [0001] The invention relates to the technical field of production of automobile parts, in particular to the improvement of the special processing technology of the metal guide nozzle of the fuel filler port of the automobile fuel tank. Background technique [0002] The fuel pipes of the fuel tank of the car are all equipped with a guide nozzle, which is used as the fuel gun interface when fueling. The diversion nozzle is generally in the shape of an eccentric bell mouth, and there is an internal thread in the bell mouth, which is used to connect the fuel tank cap and seal the fuel tank. As a commonplace auto part, its production process has always been carried out according to the following process steps: first stretching, then heat treatment, then screw threading, and finally reshaping. Specifically, there are the following two main processes: [0003] 1. In the traditional process, in the stretching step, some manufacturers process through one process, an...

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Problems solved by technology

However, since stretch forming will lead to large internal stress of the product, it is necessary to anneal halfway to eliminate internal stress before thread forming

This in turn leads to residual stress in the product after secondary processing (thread forming), often causing cracking of the workpiece during the subsequent welding process, and the product after secondary processing will be magnetic and will absorb impurities

At the same time, after secondary processing, surface defects such as "indentation" will appear on the surface of the workpiece

[0005] According to the above segmented processing concept, that is, to do bright annealing treatment in the middle (between stretch forming and thread forming), it will lead to insufficient continuous production, a backlog of semi-finished products in the factory, many product states on site, difficult management, and quality risks. ;Returned halfway and then processed, the appearance of the product has detailed processing traces, and the overall brightness of the appearance is uneven

[0006] Annealing in the middle will increase the process, and it needs to be cleaned before annealing, and it needs to be cleaned again after the secondary processing. The two cleanings are not environmentally friendly and the cost increases

[0007] In addition, for the thread forming process, some manufacturers currently use screw thread to buckle the thread. This method will lead to stress concentration and easy cracking, and the consistency of clamping and positioning is not accurate enough. The parts need to be unscrewed manually, which has quality risks and is cumbersome to operate.

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