Application of cemented carbide deep hole drill reverse cone

Application of cemented carbide deep hole drill to reverse cone

1. The inverted taper of tungsten steel deep hole drill refers to the structure form of the inverted taper of the deep hole drill which deliberately grinds the cemented carbide drill bit into the large size of the tool head and the small size of the tail end in the manufacturing process.

2. the role of cemented carbide deep hole bit in reverse cone.

Reduce friction between bit and workpiece hole and reduce cutting heat.

Ensure that cooling and lubricating film is generated to prevent wear of drill guide strip and sizing blade.

The size of the inverted cone directly affects tool life and service life, as well as the machining accuracy of holes.

Usually the smaller the inverted cone, the better the straightness of the hole under the same processing conditions, and the better the tool size retention ability (suitable for the tool with smaller hole tolerance). However, the lubrication condition of the tool will be reduced, resulting in large cutting resistance and intensified tool wear.

With the increase of the inverted cone of the deep hole drill, the lubrication ability of the cone surface is enhanced, and the machining length of the tool edge after single grinding will increase. However, with the grinding of the tool, the dimension of the hole being machined varies greatly, and the inverted cone of the tool increases, which will also lead to the increase of the straightness and other shape errors of the hole being machined.

Therefore, various factors should be taken into account in determining the inverted cone of deep hole bit.

3. inverted cone of cemented carbide deep hole bit

Because of the different design methods of coal price, only 1:1200 inverted cone of conventional deep hole drills is listed, and the actual processing range is controlled between 1:1000 and 1400. For deep-hole drills with aperture tolerances less than IT8, the number of cutter grinding is usually increased, and the inverted taper can be reduced to 1:2000.

To sum up, the grinding of the inverted taper end edge of the deep hole drill can be adjusted and corrected at any time according to the actual processing conditions after the production of the deep hole drill.

The form of oil gap of deep hole drill and the inverted cone of deep hole drill can not be modified casually after being manufactured. Therefore, the deep hole drill needs to describe the processing materials, processing accuracy requirements and processing efficiency requirements clearly before ordering, so as to make the deep hole drill accurately.