Expansive force reamer

Abstract

The invention belongs to the cutting tool technical field and relates to an expansive force reamer. The reamer comprises a rod-shaped reamer base body integrating a tool shank, a knife blade and a tool bit; blades are circumferentially and uniformly distributed at the outside surface of the tool bit; a cuttings chute is arranged between two adjacent blades. The reamer is characterized in that the center of the knife blade and the tool bit of the reamer base body is provided with a hole along the axial direction; the diameter of the hole near the tool bit is gradually increased from inside to outside to the outer end of the tool bit, so that the hole becomes a tapered hole; a tapered pin that is matched with the tapered hole and can adjust the outside diameter of the blade is arranged in the tapered hole. The reamer has the advantages that the service life is generally over seven times longer than the service life of the existing reamers; the machining precision is high, the phenomenon that the blade is broken reduced or avoided; the blade can be adjusted after being worn down; the requirement of the original precision of producing the reamer is not high; and the reamer is applicable to ream working parts with various apertures and precision requirements.

Description

technical field [0001] The invention belongs to the technical field of cutting tools, in particular to an expansion force reamer whose outer diameter of the blade of the reamer can be adjusted. Background technique [0002] The reamer used in industry requires high precision of the workpiece hole to be reamed, and the error is extremely small. The reamer currently used (see Figure 1) generally includes a handle 1, a blade body 2, and a cutter head 3. The rod-shaped reamer base body of the formula structure has blades 4 evenly distributed on the outer surface of the cutter head 3 in the circumferential direction, and a pin row groove 5 is arranged between two adjacent blades 4, and the reamer of the cutter head 3 part of the blade 4 is installed. The base body of the knife is a solid structure, and its disadvantages are as follows: the one is that after the reamer has reamed a certain number of holes, the outer surface of the blade 4 (i.e. the blade edge) will gradually wear ...

AI Technical Summary

Problems solved by technology

[0002] The reamer used in industry requires high precision of the workpiece hole to be reamed, and the error is extremely small. The reamer currently used (see Figure 1) generally includes a handle 1, a blade body 2, and a cutter head 3. The rod-shaped reamer base body of the type structure has blades 4 evenly distributed on the outer surface of the cutter head 3 in the circumferential direction, and a pin row groove 5 is arranged between two adjacent blades 4, and the reamer of the cutter head 3 part of the blade 4 is installed. The base body of the knife is a solid structure, and its disadvantages are as follows: the one is that after the reamer has reamed a certain number of holes, the outer surface of the blade 4 (i.e. the blade edge) will gradually wear away, which cannot guarantee the tolerance of the holes of the workpiece to be machined. If the reamer continues to process the workpiece, it will cause all processed products to be unqualified, forming defective or waste products; the second is that the existing reamer has a short life, and the reamer will be scrapped after the reamer is worn to the point that it does not meet the requirements. A large amount of cemented carbide reamers will be consumed, resulting in a waste of raw materials and an increase in the production cost of the enterprise. Even if it is not scrapped, the reamer must be heated and the blade made of tungsten steel moved out, and the blade will be ground after cooling. required precision requirements, which is time-consuming and expensive for processing; the third is that the radial dimension of the blade 4 on the reamer base cannot be adjusted, so that the accuracy of the aperture of the workpiece is gradually reduced; the fourth is that the existing reamer cuts the The cutting edge of the blade is worn and widened, so that the reamer bears a large load and is prone to snapping

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