Cold forging-based manufacturing method for boss used for vehicle engine fuel track and manufacture device

Abstract

The invention relates to a cold forging-based manufacturing method for boss used for a vehicle engine fuel track and a manufacture device. The manufacture method includes a cutting step of cutting a round-shaped steel rod for forming a cylindrical first mold body; a first forging step of pressing the outer periphery of the cylindrical mold body for forming a second mold body having a front flat face and a rear flat face and an upper and lower convex curve parts; a softening heat treatment step of performing annealing heat treatment on the second mold body to soften the second mold body; a film covering step of performing film covering on the second mold body by utilizing a film covering treating agent; a second forging step of utilizing a forging mold composed of an upper punch head and a lower mold part for pressing and forging the second mold body into a third mold body having a round trough part provided by the fuel track body; an ending step of performing abrasive blasting on the third mold body and performing surface treatment. The method can eliminate all defects caused by casting and minimize cutting procedures. The mold body is good in tissue compactness, high in strength, good in dimension precision and good in quality.

Description

technical field [0001] The invention relates to a manufacturing method and a manufacturing device for a boss used for a vehicle engine fuel rail based on cold forging. Background technique [0002] This developed part is applied to the vehicle engine, and it is a boss (boss) assembled on the fuel rail that transfers the fuel inside the fuel tank of the automobile engine to the injector and then to the engine. Bosses and injectors are the core components of the fuel system. In the fuel rail, the fuel manifold of the fuel injection device leads to each cylinder. High pressure occurs when the engine is running. Therefore, for the safety of the components, it must be Development of a cold forging process capable of improving mechanical properties. [0003] The existing manufacturing method is to process castings or directly process raw materials for use, but casting causes large porosity defects. In addition, when manufacturing from raw materials, the amount of cutting is accom...

AI Technical Summary

Problems solved by technology

[0005] 1. Leakage of high pressure due to internal defects (porosity / segregation)

[0006] 2. Tool (Toll) damage and excessive cutting during machining (environmental pollution source)

[0007] 3. Poor processing occurs

[0008] 4. Difficulty in miniaturization design

[0009] 5. When designing castings, the structure is large

[0010] 6. Too much cutting occurs, and the cost of raw material input increases

[0011] 7. Low productivity and reduced reliability of quality assurance

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