JPS6221363Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a bite shank for eliminating chatter that occurs during cutting with a lathe or the like.

When performing outer diameter cutting on a lathe, the protrusion dimension of the cutting tool from the tool rest is relatively small, and chatter does not occur as much as with a boring bar that performs inner diameter cutting. For this reason, various anti-vibration boring bars have been devised to prevent chatter, but no countermeasures have been taken for external cutting tools. However, when cutting the outer diameter of a workpiece made of a hard material, chatter still occurs, which is a problem.

The present invention uses resin concrete with high damping properties in the shank part as a measure to prevent chatter, which is particularly suitable for cutting tools for outer diameter cutting. That is, the shank portion of the cutting tool is made of a steel core with an H-shaped cross section and resin concrete, and the resin concrete on both sides are connected through a horizontal hole in the core. Note that boring bars that use resin concrete for vibration isolation have not yet been manufactured.

Embodiments of the present invention will be described below with reference to the drawings.
A cutting tool in which the shank part 1 is composed of a steel core bar 3 with an H-shaped cross section in which an H-shaped central beam is located in the direction of the main cutting force, and resin concrete 4 cast on both sides of the H-shaped core bar 3. The resin concrete 4 on both sides are connected through a horizontal hole 5 bored in the core member 3 having an H-shaped cross section. The shape of the core metal is not limited to that shown in the figures, but can be modified in various ways. In addition to casting, resin concrete can also be bonded to a core metal by adhesive.

As detailed above, the cutting tool of the present invention has a shank part composed of an H-shaped steel core with an H-shaped central beam located in the direction of the principal force during cutting, and resin concrete. Rigidity against component forces can be provided by the core metal in its maximum rigidity state, and vibration damping properties can be provided by resin concrete, resulting in a rigid and highly damped tool bit that prevents chatter from occurring during cutting. . Therefore, it is particularly effective for cutting high-hardness materials. Furthermore, due to the relationship between the H shape of the core metal and the principal component force, the set bolt that fixes the shank to the tool rest presses on the top of the core metal, thereby preventing damage to the resin concrete. In addition, resin concrete has excellent heat insulation properties, so even if the cutting edge generates heat during cutting, the shank does not stretch, reducing dimensional changes in the workpiece. Furthermore, the weight of the entire cutting tool is reduced, making it easier to handle. Furthermore, since the resin concrete on both sides of the H-section steel core is connected through the horizontal holes in the core, it is difficult to separate, and when the resin concrete contracts, the core is firmly clamped and the damping performance can be further improved. .

[Brief explanation of the drawing]

FIG. 1 is a front view of an embodiment of the present invention, and FIG. 2 is a perspective view of FIG. 1. 1...Shank part, 3...Core metal, 4...Resin concrete, 5...Horizontal hole.

Claims (1)

[Scope of utility model registration request] The shank part is made of resin concrete and a steel core with an H-shaped cross section in which an H-shaped center beam is located in the direction of the main cutting force, and is characterized by connecting the resin concrete on both sides of the center beam through a horizontal hole in the core. A part-time job.