How do I make a qualified reamer?

The reamer has one or more teeth to remove a rotating tool with a thin metal layer of the machined surface. The twisted holes are machined to achieve precise dimensions and shapes. Do you know more about it?

Here is the content list:

●What are the design points of the reamer?

●What are the requirements for the number of teeth and grooves of the reamer?

●What are the reasons for the large aperture when using reamers?

What are the design points of the reamer?

The diameter tolerance of the reamer directly affects the dimensional accuracy, manufacturing cost, and service life of the reamer. When reaming, due to the radial run-out of the teeth and the amount of reaming and cutting fluid and other factors will make the aperture larger than the diameter of the reamer, called reaming hole "expansion", and because the blunt radius of the blade squeeze hole wall, will cause the hole to recover and shrink, called reaming hole "shrink". The general "expansion" and "shrink" factors exist at the same time, and the final results should be determined by experiments. Experience shows that: with high-speed steel reamer reaming holes expand, with carbide reamer reamers generally shrink, reaming thin wall holes, also often shrink. The nominal diameter of the reamer is equal to the nominal diameter of the hole. The upper and lower deviations of the reamer should take into account the expansion, shrinkage, and leave the necessary wear tolerances.

What are the requirements for the number of teeth and grooves of the reamer?

The number of teeth of the reamer affects the precision of the reamer, surface roughness, debris space, and tooth strength. Its value is generally determined by the reamer diameter and workpiece material. When the diameter of the reamer is large, more teeth are desirable, fewer teeth should be taken when processing tough materials, and more teeth are desirable when processing brittle materials. To facilitate the measurement of the reamer diameter, the number of teeth should be even. In the commonly used diameter do - 8 to 40mm range, the general number of teeth is 4 to 8. The reamer teeth can be distributed equidistantly along the circumference, or they can be distributed equally. For ease of manufacture, reamers are generally distributed at equal gear distances.

What are the reasons for the large aperture when using reamers?

1. The reamer is very different from the machine spindle. Solution: replace the more accurate shank and barrel clip, or replace it with a hydraulic shank, floating shank, etc. 

2. The cutting edge has a chip tumor. Solution: For non-coated carbide, reamers should reduce the cutting speed, coated tungsten steel reamers to improve cutting speed or increase the concentration of cutting fluid. 

3. The reamer diameter is too large. Solution: Re-grind the reamer blade.

Hejian Hengji Bit Manufacture Co., Ltd is specialized in researching and production of rock drilling bits. Our mission is to continually improve and provide quality drill tools, for the drilling industry, both domestic and internationally, that result in customer satisfaction. If you want to buy a reamer, you may want to consider using our products.