Hot pressing bush device and hot pressing process of connecting rod piston pin hole

Abstract

The invention discloses a hot pressing bush device and a hot pressing process of a connecting rod piston pin hole, which are applied to a hot pressing bush of the connecting rod piston pin hole. A press mounting system and an infrared sensing thermodetector are arranged in a high-frequency heating furnace; the high-frequency heating furnace and the press mounting system are controlled by an electric control system respectively; both sides of the press mounting system are provided with high-frequency induction coils; a connecting rod is positioned on a press mounting system panel; a guide sleeve is fixed in the press mounting system; a bush is sleeved on a press-in shaft; axial motion of the press-in shaft and a positioning mandrel is controlled by the electric control system respectively;and a protective cap is arranged at the periphery of the high-frequency heating furnace. During press mounting, a connecting rod piston pin hole end is put into the high-frequency heating furnace andthe high-frequency induction coil and the infrared sensing thermodetector are used for heating and monitoring quickly. When a set temperature is reached, heating is stopped and press mounting is performed on the connecting rod piston pin hole by the press mounting system. The host pressing bush is adopted and the jointing degree between the bush and the piston pin hole is close to 100 percent, sothat the press-in force of the bush is lowered, an outer wall is prevented from being broken by press-in of the bush and safe operation of an engine is ensured.

Description

technical field [0001] The invention relates to the technical field of auto parts manufacturing, in particular to a connecting rod piston pin hole hot-pressing bushing device and a hot-pressing process thereof. Background technique [0002] Regarding the press-fitting of the bushing in the piston pin hole of the connecting rod, the current common practice is to directly press the bushing into the piston pin hole by using a press-fitting device at room temperature. Although the cold pressing method can satisfy the function, it has the following disadvantages: [0003] 1. The surface of the bushing is easily scratched, causing the bushing to fall off. Due to the interference fit between the bush and the piston pin hole, the outer diameter of the bush is larger than that of the piston pin hole. If there are any burrs or protrusions at the entrance of the piston pin hole, it will inevitably cause the outer wall of the bush to be strained, resulting in The bushing comes off whi...

AI Technical Summary

Problems solved by technology

[0003] 1. The surface of the bushing is easily scratched, causing the bushing to fall off

Due to the interference fit between the bush and the piston pin hole, the outer diameter of the bush is larger than that of the piston pin hole. If there are any burrs or protrusions at the entrance of the piston pin hole, it will inevitably cause the outer wall of the bush to be strained, resulting in Bushing comes off during engine operation

[0004] 2. The fit between the bush and the piston pin hole is low

[0005] 3. The pressure required for the bushing to be pressed in is relatively high

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