Carbide reamer and its standardization

Carbide reamers have become more widely used as an efficient cutting tool. On the basis of ISO carbides P, M and K, China has developed and produced hard alloy materials such as tungsten carbide, carbonized drill, titanium carbide, tantalum carbide and cobalt, which has overcome the difficulty of high-efficiency reaming. However, how to correctly design and process the cemented carbide reamer, especially the parameters of the cemented carbide reamer, to achieve reasonable arrangement, standardization, optimization and serialization, and to obtain satisfactory economic results, is still worthy of attention. Question.

1 Determine the cutting edge, correction edge, transition edge belt

One of the key parts of the reamer is the land, the different materials to be machined, the different workpiece reaming allowance and the relative rotational speed of the different workpieces and reamer determine the different blade widths.

The reamer used in production often appears as follows:

The reamer has a short service life and the blade belt is quickly worn away and scrapped;

The surface roughness of the reamer is poor, resulting in a worse surface roughness of the hole of the workpiece to be processed;

The hole after the workpiece is reamed is deformed, so the roundness of the hole is too bad, which often causes the product to be scrapped.

After analyzing the cemented carbide reamer used in the field, it was found that the amount of scrapped reamer wear was not large. Except for the wear marks near the cutting edge and the transition edge of 1-2 mm, the other cutting edges were intact, so it was concluded that: In order to continuously improve the surface roughness of the outer circumference of the reamer cutting edge, the width of the carbide reamer must be optimized. After several production practices and tests, the optimum size range of the reamer width was found, as shown in Table 1.