Multi-step forming reaming drill

Abstract

The invention provides a multi-step forming reamer. The multi-step forming reamer comprises a cutter body and a cutter head formed at one end of the cutter body. A first cutting edge is formed at the end of the cutter head, the cutter head is further provided with a plurality of broaching parts, and the diameter of the broaching part far away from the first cutting edge is larger than the diameter of the broaching part close to the first cutting edge in every two adjacent broaching parts. Chip removal grooves are further formed in the cutter head, the chip removal grooves extend to the other end of the cutter head from one end of the cutter head, a second cutting edge of the cutter head is formed on the edge of each chip removal groove, and the second cutting edges are formed on the side face of the cutter head. The positive cone of the core thickness of the cutter head is 0.65:10 or 1.0:10. Cutter head forming faces are formed on the wall face, making contact with the hole walls of machined stepped holes, of the cutter head. The multi-step forming reamer meets the requirements that materials used for machining hydraulic valve body holes are machined difficultly, the number of steps is large and the service life is long. Drills of various structures are combined with the corresponding forming faces, the corresponding step holes can be machined and formed at a time, and the machining efficiency and the machining precision are high.

Description

technical field [0001] The invention relates to the technical field of precision cutting tools, in particular to a multi-step forming reaming drill. Background technique [0002] The hydraulic valve block is the core component of construction machinery. When processing the assembly hole of the valve block, the size and structure of the hole are complex, there are many related dimensions, the viscosity and hardness of the material are high, and rough machining is time-consuming and expensive. [0003] Such as figure 1 As mentioned above, it is a schematic plan view of the existing drill bit. When using the existing drill bit to process the above-mentioned workpiece, the processing is difficult to meet the requirements. This is because, during processing, for multi-step holes and surfaces, it needs to be divided into multiple drill bits for processing. For example, for the processing of the mounting hole of the valve block, its structure is the combination of three-step hole...

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Problems solved by technology

In this way, the processing efficiency is low and the processing cost is high

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