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JP-2026075386-A - Tool holder

JP2026075386AJP 2026075386 AJP2026075386 AJP 2026075386AJP-2026075386-A

Abstract

[Problem] To provide a tool holder that can efficiently remove chips and other debris adhering to the workpiece or tool. [Solution] The tool holder (1) receives and holds the shank of the cutting tool (50), and sprays coolant liquid onto the cutting edge of the cutting tool (50) via a coolant supply passage extending in the axial direction. The coolant supply passage is provided with a first coolant passage (32) extending in the axial direction, and a fine bubble generating member (30) that generates fine bubbles in the coolant liquid within the first coolant passage (32) is provided, and a connecting member (40) is provided with a second coolant passage (42) extending in the axial direction, the rear end of which abuts against the front end of the fine bubble generating member (30), and the front end of which abuts against the rear end of the cutting tool (50). [Selection Diagram] Figure 1

Inventors

  • 長濱 明治
  • 中井 英策

Assignees

  • 株式会社日研工作所

Dates

Publication Date
20260508
Application Date
20241022

Claims (7)

  1. A tool holder that receives and holds the shank of a cutting tool, and sprays coolant liquid onto the cutting edge of the cutting tool via a coolant supply passage extending in the axial direction, The coolant supply passage includes: A first coolant passage, which is a through-hole extending in the axial direction, is provided, and a fine bubble generating member is provided that generates fine bubbles in the coolant liquid within the first coolant passage. A tool holder is provided with a second coolant channel, which is a through-hole extending in the axial direction, and a connecting member whose rear end abuts against the front end of the fine bubble generating member, and whose front end abuts against the rear end of the cutting tool.
  2. The fine bubble generating member is made of a soft material. The tool holder according to claim 1, wherein the connecting member is formed of a hard material.
  3. The tool holder according to claim 1 or 2, wherein the cross-sectional area of the front end of the first coolant flow path of the fine bubble generating member is smaller than the cross-sectional area of the rear end of the second coolant flow path of the connecting member.
  4. The cutting tool is provided with a third coolant passage, which is a through-hole extending axially to its cutting edge. The tool holder according to claim 1 or 2, wherein the cross-sectional area of the front end of the second coolant passage of the connecting member is greater than the cross-sectional area of the rear end of the third coolant passage of the cutting tool.
  5. The tool holder according to claim 1 or 2, wherein the first coolant flow path of the fine bubble generating member extends spirally along the axial direction and has a cross-sectional shape with a constricted radial center.
  6. The connecting member is provided with a radial passage at its front end surface that extends from the second coolant flow path to its radially outer surface. The tool holder according to claim 1 or 2, wherein the tool holder is provided with a groove extending from the end of the radial passage toward the cutting edge of the cutting tool.
  7. A holder body having the coolant supply passage formed inside, The tool holder according to claim 1, further comprising a collet having a tool insertion hole formed in the tip region of the holder body for holding the cutting tool, and a plurality of slits extending in the axial direction.

Description

This invention relates to a tool holder, and more particularly to a tool holder for receiving and holding the shank of a cutting tool, which sprays coolant onto the cutting edge of the cutting tool through a coolant supply passage extending in the axial direction. Generally, machine tools process workpieces while supplying large quantities of cutting fluid or cleaning fluid to the processing area for purposes such as cooling, lubrication, and chip removal. When processing workpieces in this manner, tool holders are used that are equipped with a structure that supplies cutting fluid or cleaning fluid, such as coolant, from the spindle of the machine tool towards the cutting edge of the cutting tool. Examples of documents disclosing such technology include, for example, Japanese Patent Application Publication No. 2013-063483 (Patent Document 1) and International Publication No. WO2009/135660 (Patent Document 2). Patent Document 1 discloses a holder body provided with a through-hole extending axially from the spindle of the machine tool toward the cutting tool, where liquid is supplied from the spindle to form a liquid passage. Patent Document 2 discloses a method of machining a workpiece while supplying an oil mist, generated by mixing oil and high-pressure air, to the machining area. It discloses that the working spindle and chuck are provided with through-holes extending axially, and that a connecting sleeve, nozzle tube, transfer tube, and adapter sleeve for generating the oil mist are arranged within these through-holes. Japanese Patent Publication No. 2013-063483International Publication WO2009/135660 This is a side view showing a tool holder according to Embodiment 1 of the present invention.This figure shows a fine bubble generating component; (A) is a perspective view, (B) is a front view, and (C) is a cross-sectional view taken along the line IIc-IIc in Figure 2(B).This diagram shows the connecting members; (A) is a perspective view, and (B) is a front view.This is a diagram showing a magnified portion of Figure 1.This is a side view showing the flow of coolant liquid in a tool holder according to Embodiment 1 of the present invention.This is a side view showing a tool holder according to Embodiment 2 of the present invention.This figure shows the connecting members; (A) is a plan view, and (B) is a cross-sectional view taken along the line VIIb-VIIb in Figure 7(A).This is a side view showing the flow of coolant liquid in a tool holder according to Embodiment 2 of the present invention.This is a side view showing a tool holder according to Embodiment 3 of the present invention. Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, identical or corresponding parts are denoted by the same reference numerals, and their descriptions will not be repeated. (Embodiment 1) A tool holder according to Embodiment 1 of the present invention will be described with reference to Figures 1 to 4. In Figure 1, the dashed line O is the axis, the arrow T is referred to as the forward side in the axial direction (also called the tip side), and the opposite direction of arrow T is referred to as the rear side in the axial direction (also called the rear end side). In particular, as shown in Figure 1, the tool holder 1 receives and holds the shank of the cutting tool 50. The tool holder 1 sprays coolant onto the cutting edge of the cutting tool 50 through a coolant supply passage extending in the axial direction. The holder body 10 has a rear hole 11, a central hole 12, and a front hole 13 formed inside, extending from the rear in the axial direction to the front. The rear hole 11 extends axially forward from the rear end of the holder body 10. The rear hole 11 has multiple steps, with the diameter being smallest at the axial front. A center-through coolant pipe 20 is positioned at the tip of the rear hole 11. The center-through coolant pipe 20 will be described later. The central hole 12 connects to the front end of the rear hole 11 and extends axially forward. The inner diameter of the central hole 12 is approximately the same as, or slightly smaller than, the inner diameter of the rear hole 11 on the axially forward side. The fine bubble generating member 30 and the connecting member 40 are arranged in the central hole 12 in that order from the axial rear. The fine bubble generating member 30 and the connecting member 40 will be described later. The front hole 13 connects to the front end of the central hole 12 and extends axially forward. The inner diameters of the front end of the rear hole 11, the central hole 12, and the front hole 13 are approximately the same. The rear hole 11, the central hole 12, and the front hole 13 form a through-hole extending from the front to the rear end of the holder body 10. The outer circumference of the holder body 10 has a gripping flange portion 16 that protrudes in the outer diameter direction. The flange portion 16 is loc