Tappet hole finish machining honing cutter and machining method

Abstract

The invention discloses a tappet hole finish machining honing cutter. The tappet hole finish machining honing cutter comprises a honing rod of a hollow structure. A honing base welding a honing strip is arranged at one end of the honing rod. Round springs used for pressing the honing base are arranged at the two ends of the honing base. A connecting rod which is connected with a machine tool and is of a hollow structure is arranged at the other end of the honing rod. The end of the honing rod stretches into an inner cavity of the connecting rod and is in flexible connection with the connecting rod through a limiting spring. An adjusting mechanism penetrating the inner cavity of the honing rod and pushing the honing base to change in the radial direction is arranged in the honing rod. The invention further discloses a tappet hole finish machining method. The tappet hole finish machining honing cutter is simple in structure and convenient to operate, a tappet hole is machined through the cutter arranged to be of a split structure, the machining quality is stable, the cost is low, and the quality of products is effectively improved.

Description

Technical field [0001] The invention relates to the technical field of diesel engine machining, more specifically, it relates to a tool and method for finishing tappet holes. Background technique [0002] The diameter of the tappet hole of the gray iron 250 diesel engine is generally large, Φ32mm, and the length is about 50mm. Its aperture accuracy, roughness and coaxiality are required to be high. In order to ensure the machining accuracy of the tappet hole and the CPK value ≥1.33, At the same time, taking into account the manufacturing cost, the processing quality of the tappet hole finishing tool is required to be stable, and the tool cost of a single product is low. The tappet hole is generally processed through the tappet hole pre-casting through hole and machining process. The machining process includes three processes of rough machining, semi-finishing and finishing. At present, in the process of tappet hole machining, the tools are mostly solid carbide multi-blade reamer...

AI Technical Summary

Problems solved by technology

At present, in the process of machining the tappet hole, the tools are mostly solid carbide multi-blade reamers, single-blade gun reamers and single-blade CBN fine boring tools. However, due to the gap in front of the tappet hole In the segment, the processing tools are mostly integral long tools. Once such tools are worn or broken, the replacement cost will be relatively high, and the processing stability is insufficient. If split tools are used, the structure and combination of the tools need to be higher. requirements, the rigidity and structural strength of the tool cannot meet the requirements of large processing force; in addition, since three tools are required for finishing the tappet hole, the machine tool cannot guarantee that the center positions of each tool are completely coincident, and the coaxiality cannot reach Meet the requirements, thus affecting the processing quality

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