JPH04193451A - Cover for preventing coolant liquid from splashing - Google Patents

Abstract

PURPOSE:To blow a coolant to a cutter inside a cover, and to prevent the splashing, by equipping a cylindrical cover which surrounds the circumference of the cutter on a holding member. CONSTITUTION:An annular groove 11a is provided inside a cover 18 on a holding member 9, with the edge tip of a cutter 2 being projected and the cylindrical cover 18 which surrounds the circumference being fixed, a coolant discharging port 11 communicating with this groove 11a is opened at plural places on the circumference of the groove 11a, moreover, a cylindrical case 12 is provided in the axial direction parallel to the axial line of a tool holder 1, and a coolant pine 13 is inserted into this case 12 movably forward and backward in the axial direction. A coolant is blown toward the cutter 2 from a coolant discharging port 11. However, the coolant blown to the cutter 2 is inside the cover 18 surrounding the circumference of the cutter 2, and the coolant is not splashed to the circumference with the rotation of the cutter 2.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a cover for preventing scattering of coolant liquid and chips during machining of a tool holder used in a machine tool with replaceable tools.

<Prior art> As shown in FIG. 2, a tool holder that is used to exchange tools with a machine tool using an automatic tool changer has a cutting tool 2 attached to one end of the tool holder 1 and a shaft g7 fitted to the other end. This structure has a taber shank 3 and a pull stud 4, and a gripping groove 5 to be gripped by a tool gripping arm of an automatic tool changer and a lock bolt 6 for changing the cutting tool are provided in the intermediate part.

A coolant nozzle 8 is fixed to the shaft head 7 near the cutting tool 2 so as to face the cutting tool 2.

<Problems to be Solved by the Invention> When processing the workpiece W using the conventional tool holder 1 described above, the coolant sprayed onto the cutting tool 2 becomes a mist and scatters around the cutting tool 2 due to rotation of the cutting tool 2, and flat surface processing. The chips will also be scattered around.

The above measures include covering the entire cutting tool with a cover to prevent scattering, but since the cover interferes with the automatic tool changer when changing tools, it is not easy to install, and it is difficult to cover the entire cutting tool with a cover. Covering the metal with a metal wire would result in high costs, and in the past, a cover was only attached around the machined metal.

Means for Solving the Problems> The present invention provides a tool holder having a cutting tool attached to one end and a taber shank fitted to a spindle at the other end, and a holding member on the outer circumferential surface of one end of the tool holder so as to be rotatable relative to the tool holder. A cylindrical cover that surrounds the cutting tool, a coolant discharge port that opens within the cover, and a shaft head that is provided to be movable in an axial direction parallel to the axis of the tool holder. The tool holder includes a coolant pipe connected to the coolant supply passage, and the coolant pipe is provided with a protruding rotation and a locking pin that can be connected to and detached from the tool holder.

Function> With the above configuration, the cover is attached to the tool holder, and the coolant is sprayed onto the cutting tool within the cover, thereby preventing splashing.

In addition, when the tool holder is fitted to the spindle, the cover is prevented from rotating due to the connection between the coolant pipe and the coolant supply passage of the shaft head, and when it is removed from the shaft head, the rotation stopper pin provided on the coolant pipe prevents the tool holder from rotating. This prevents the cover from rotating and prevents interference with the tool changer when changing tools.

<Example> Hereinafter, 81 examples of the present invention will be described based on the drawings. 1st
In the figure, 1 is a tool holder, and this tool holder 1
A cutting tool 2 is attached to one end, a taper shank 3 and a pull stud 4 are attached to the other end, and the other end has a taper shank 3 and a pull stud 4 that are fitted to the shaft head, and a gripper/lI5 is provided in the middle to be gripped by a tool gripping arm of an automatic tool changer. and a lock bolt 6 for cutting tool replacement.

A holding member 9 is fitted onto the outer peripheral surface of one end of the tool holder 1 by a bearing 10 so as to be rotatable relative to the tool holder 1. This holding member 9 includes a cylindrical cover 18 that protrudes the cutting edge of the cutting tool 2 by an appropriate amount 1 and surrounds it.
is permanently installed.

Further, a ring-shaped coolant 11a is provided in the cover 18 of the holding member 9, and coolant discharge ports 11 communicating with the groove phase a are opened at a plurality of locations on the circumference of the groove 11a. A cylindrical case 12 is provided in an axial direction parallel to the axis of the tool holder 1, and a coolant pipe 13 is fitted into the case 12 so as to be movable in the axial direction. This coolant pipe 13 is always pressed upward in FIG. 1 by a spring 14.

The coolant pipe 13 is connected to a coolant supply passage 22 provided in the shaft head 21 when the tool holder 1 is fitted onto the spindle 20 of the circuit.

A locking pin 15 is provided on the coolant pipe 13 to protrude toward the tool holder 1, and the case 12 is provided with an elongated hole 16 that passes through the locking pin 15 and allows the coolant pipe 13 to move forward and backward. .

Further, the tool holder 1 is provided with an engagement groove 17 in which the rotation stopper pin 15 engages to restrain rotation of the holding member 9 when the coolant pipe 13 is advanced to the frontmost end.

In the above configuration, when the tool holder 1 is not fitted to the spindle, the coolant pipe 13 is in the forward position (the raised end in FIG. 1) inside the case 12 by the spring 14, and the locking pin 15 is engaged with the engagement groove 17, and the holding member 9 is prevented from rotating. Therefore, the gripping claws of the tool exchange arm do not interfere with the case 12 or the coolant pipe 13 during tool exchange.

Moreover, when the tool holder 1 is fitted to the spindle, the coolant pipe 13 is connected to the coolant supply passage of the shaft head, and the coolant pipe 13 compresses the spring 14 and moves backward (
(descending in Figure 1). As a result, the detent pin 15 disengages from the engagement groove 17 of the tool holder 1, and the holding member 9
The tool holder 1 is free in the rotational direction, but the holding member 9 is prevented from rotating because the coolant pipe 15 is connected to the coolant supply passage of the shaft head.
The tool holder 1 and the holding member 9, which rotate together with the spindle, rotate relative to each other.

Coolant is then sprayed from the coolant discharge port 11 toward the cutting tool 2. However, the coolant that is sprayed onto the cutter 2 is inside the cover 18 that surrounds the cutter 2, and the coolant does not scatter around the workpiece when the cutter 2 rotates. In the case of a milling cutter that processes the back surface, the chips cut by this milling cutter scatter around the surroundings,
This chip is also prevented from scattering by the cover 18. The present invention is applicable to rotating cutting tools or milling cutters, but is also applicable to drills and polling cutting tools.

<Effects of the Invention> As described above, the present invention provides a tool holder having a cutting tool attached to one end and a taper shank fitted to a spindle at the other end, and a holding member attached to the outer circumferential surface of the one end of the tool holder to enable relative rotation of the tool holder. The holding member includes a cylindrical cover that surrounds the cutting tool, a coolant discharge port that opens within the cover, and a shaft that is movable in an axial direction parallel to the axis of the tool holder. The coolant pipe is equipped with a coolant pipe that is connected to the coolant supply passage of the tool head, and the coolant pipe has a coolant liquid scattering prevention cover with a rotation that can be connected to and detached from the tool holder and a correcting pin protruding, so that coolant and cutting can be prevented. There is no scattering of powder, there is no contamination of the environment around the machine, and there is no need to install a large cover.
There is no wasted space and costs can be reduced.

Furthermore, since the cover is prevented from rotating both when the tool holder is attached to the spindle and when it is removed, it does not interfere with other machinery during machining or when changing tools. It has advantages such as no interference.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of the present invention, and FIG. 2 is a front view of a conventional tool holder. DESCRIPTION OF SYMBOLS 1... Tool holder, 2... Cutting tool, 3... Taper shank, 9... Holding member, 11... Clamp discharge port, 12... Case, 13... Coolant pipe, 14...
...Spring, 15... Rotation pin, 17...
Engagement groove, 18...cover.

Claims (1)

[Claims] A holding member is fitted to the outer peripheral surface of the one end of a tool holder having a cutting tool attached to one end and a tapered shank fitted to a spindle at the other end so that the tool holder can be relatively rotated. A cylindrical cover that surrounds the periphery, a coolant discharge port that opens within the cover, and a coolant pipe that is provided so as to be movable back and forth in an axial direction parallel to the axis of the tool holder and that is connected to the coolant supply passage of the shaft head. A coolant liquid scattering prevention cover comprising: a coolant liquid scattering prevention cover, the coolant pipe having a rotation and a locking pin protruding from the coolant pipe that can be connected to and detached from the tool holder;