JPH11285949A - Tool holder with jet port - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tool holder equipped with a jet port wherefrom a noncombustible gas jets out in such a way as forming a cylindrical barrier. SOLUTION: This tool holder H1 is held upon insertion into the tip hole of a spindle. The tool holder H1 has a holding cylinder 7 to grasp a tool T, and a jet port N1 is opened in a part of the forefront face 7A of this cylinder 7, and a noncombustible gas G is jetted out of the jet port N1 toward the tool tip. This enables enhancement of the machining accuracy of the surface and prevention of its being oxidated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool holder with an injection port for ejecting a non-combustible gas or a non-combustible gas mixed with a mist by forming a cylindrical barrier on a tool edge mounted on a machine tool or the like. .

[0002]

2. Description of the Related Art Conventionally, a cooling method for a tool mounted on a main shaft of a machine tool is performed by injecting a cutting fluid (coolant liquid) from a nozzle toward a tool tip, thereby reducing friction at the tool tip and suppressing temperature rise. Efficient cutting and longer tool life. Further, the chips are flowed by the coolant at the injection pressure of the coolant liquid, and the chips are simultaneously removed.

In the method of cooling a tool using the above-mentioned cutting fluid (coolant fluid), sludge treatment is necessary, and since this sludge contains decaying cutting fluid, it becomes difficult to treat the waste fluid. Also, cutting fluid (coolant fluid)
Since the liquid is circulated and reused, the liquid temperature gradually rises, and the rise in the liquid temperature causes thermal expansion of various parts of the machine, which is one of the causes of impairing the processing accuracy.

[0004] Recently, a coolant-less technique has been developed in which low-temperature air is blown to a tool edge. According to this air blowing method, although the sludge treatment is not required, the oxidation of the cutting point is promoted, so that there is a problem that a good processing of the finished surface cannot be performed. Further, since only a slight cooling effect can be obtained by blowing air, cutting oil is added as an oil mist to improve cutting workability and oxidation prevention.

[0005] However, since the oil mist is sufficiently mixed with the blowing air and injected to the processing point of the workpiece, the temperature of the tool edge at this time becomes close to 1000 ° C, so that the oil mist is reduced. It is the cause of the disaster of igniting.

[0006]

Therefore, recently, a method has been proposed in which non-combustible gas is injected to a processing point in place of cooling means for low-temperature air or low-temperature air mixed with mist. This injection method has the advantage that oxidation of the processing point can be prevented and danger of ignition due to oil mist can be prevented.
However, the non-combustible gas, if the direction of the injection nozzle is correctly injected to the processing point and the atmosphere and the predetermined concentration of the non-combustible gas are not formed, oxidation of the processing point and abrasion of the cutting edge are promoted,
There is a problem that good processing of the finished surface cannot be performed.

Further, since the injection nozzle requires a space for mounting the injection nozzle, interference with the work occurs during the processing, making it impossible to continue the processing. If the machining continues, the direction of the injection nozzle will be changed,
Oxidation of the processing point and wear of the cutting edge are promoted, leading to a problem that good processing of the finished surface cannot be performed. Further, the injection nozzle has a problem that the injection liquid such as the nonflammable gas can be injected only to the local portion of the cutting tool.

SUMMARY OF THE INVENTION The present invention has been made in view of the problem of injecting a non-combustible gas by the above-mentioned injection nozzle, and provides a tool holder with an injection port in which the non-combustible gas forms a cylindrical barrier and jets out. With the goal.

[0009]

According to a first aspect of the present invention, there is provided a tool holder with an injection port having an opening formed at a part of a distal end surface of a holding cylinder for holding a tool of the tool holder. It is characterized by injecting non-combustible gas in the direction of the cutting edge.

According to a second aspect of the present invention, there is provided a tool holder with an injection port according to the first aspect, wherein a plurality of injection ports are provided at a tip end surface of the holding cylinder.

[0011]

According to the first aspect of the present invention, since the non-combustible gas injection port is provided at the tip end surface of the holding cylinder of the tool, the non-combustible gas ejected by the rotation of the main shaft wraps around the outer periphery of the tool and moves toward the tool cutting edge. To form a barrier. Therefore, the outer periphery of the tool edge mounted on the main shaft of the machine tool is directly wrapped with the non-flammable gas, and the non-flammable gas is injected and supplied to the blade edge and this processing point, thereby performing lubrication and oxidation prevention of the processing point. .

According to the second aspect of the present invention, since the non-combustible gas injection port is provided on the tip end surface of the holding cylinder of the tool, the main shaft rotates over a wide rotation range from low speed to high speed, and the non-combustible gas is supplied to the outer periphery of the tool. A cylindrical barrier is formed and sprayed toward the tool cutting edge while wrapping around.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a tool holder with a nonflammable gas injection port according to the present invention. First, the tool holder H1 with a non-combustible gas injection port shown in FIG. 2 will be described. The tool holder H1 with an injection port mounted on the main shaft 3 of the machine tool 1 has a tapered hole 3A of the main shaft 3.
, A flange portion 5B caught by a tool changing arm, and a holding cylinder 7 for holding a tool (blade) T
And The tool holder H1 is inserted into and held in the distal end hole 3A of the main shaft 3.

In the tool holder H1, an injection port N1 is formed at a part of the front end face 7A of the holding cylinder 7 for holding the tool T. The opening direction of the injection port N1 is adjusted and set so that the injection direction of the non-combustible gas G is directed to the processing point (P) of the tip end of the tool T. Further, the passage N of the injection port N1 is inserted into the tool holder H1 to reach the tail end, and is connected to the rotary joint at the rear end of the spindle by center through in the spindle. As a result, the non-combustible gas G supplied from the rear end of the spindle reaches the injection port N1 from the passage N, and injects a bundle of the non-combustible gas from the passage N toward the tool edge (a).

That is, the opening position of the injection port N1 is eccentric from the center (O) of the tool T by a radius r. The radius r is set to a value larger than the radius of the tool T, and a bundle of non-combustible gas ejected from the injection port N1 injects near the outer surface of the tool T toward the tool edge (a) along the outer surface. When the main shaft 3 is rotated in this state, a bundle of the noncombustible gas G repeatedly turns around the outer periphery of the tool T, thereby forming an intermittent cylindrical barrier G ′.

As shown in FIG. 1, the injection port N1 is connected to a supply source 20 of a non-combustible gas G such as nitrogen gas, carbon dioxide gas, compressed air or the like by a pipe 21. In addition, the mist generator 22A converts the cutting oil O in the cutting oil tank 22 into an oil mist (fog) OM, which may be supplied to the injection port N1.

A fully-closed splash guard SG is surrounded on the outer periphery of the main shaft 3 of the machine tool 1, and an injection port N
In addition to preventing the non-combustible gas G ejected from 1 from leaking to the outside, the non-combustible gas G is positively recovered by the suction recovery device K.

The tool holder with a nonflammable gas injection port of the present invention is configured as described above, and the nonflammable gas injection as described below is performed. A non-combustible gas G is supplied from a supply source 20 to an injection port N1 of a tool holder H1 mounted on the main shaft 3 of the machine tool 1. As the supply pressure, an optimal pressure suitable for the work W and the tool T is supplied within a range of 5 to ²⁰ kg / cm ² . Also,
The injection temperature is also adjusted to an appropriate temperature within a range from room temperature to 150 ° C. below zero.

As shown in FIGS. 1 and 2, the non-combustible gas G from the injection port N1 is injected by wrapping the outer periphery of the tool T in a cylindrical shape toward the cutting edge of the tool T by the rotation of the main shaft. . Thereby, the processing point (P) of the workpiece W or the tool T
Is shielded from the outside air by a cylindrical barrier G ′ formed by the noncombustible gas G. Thereby, the processing point (P) is in the atmosphere of the non-flammable gas G, and the non-flammable gas such as the nitrogen gas and the carbon dioxide gas can be reliably injected and surrounded on the tool edge (a).

The work area of the work W is sealed by a fully-closed splash cover SG as shown in FIGS. As a result, the non-combustible gas G blown out from the injection port N1 is positively collected by the suction and collection means K after the action on the processing point (P). Thus, the incombustible gas G after use is removed from the processing area by the suction and recovery means K,
The working environment and the factory are not contaminated with nonflammable gas.

The present invention is not limited to the first embodiment. For example, it may be configured as a tool holder H2 with an injection port of the second embodiment shown in FIG. That is, two or more injection ports N1 on the distal end surface 7A of the holding cylinder 7 are provided. The other components are denoted by the same reference numerals and description thereof is omitted.

The tool holder with injection port H2 according to the second embodiment of the present invention is configured as described above, and the following non-combustible gas G injection method is performed. Since the nozzle N1 of the non-combustible gas G has two or more two at the tip end surface 7A of the holding cylinder 7 of the tool holder H2, the rotation of the main shaft 3 extends over a wide rotation range from low speed to high speed, and the non-combustible gas G A cylindrical barrier G 'is formed and sprayed toward the tool edge (a) while wrapping around the outer periphery of.

[0023]

According to claim 1, according to claim 1,
Since the non-combustible gas injection port is provided on the tip end surface of the holding cylinder of the tool, the rotation of the main shaft causes the non-combustible gas to form a cylindrical barrier and inject toward the tool cutting edge while wrapping the outer periphery of the tool. Therefore, the outer periphery of the tool edge mounted on the main shaft of the machine tool is directly wrapped with the non-flammable gas, and the non-flammable gas is injected and supplied to the blade edge and the processing point. And the effect of preventing oxidation at the processing point is exhibited.

According to the second aspect of the present invention, since a plurality of non-combustible gas injection ports are provided on the tip end surface of the holding cylinder of the tool, the main shaft rotates over a wide rotation range from low speed to high speed while wrapping around the outer periphery of the tool. The reactive gas forms a cylindrical barrier toward the tool edge and injects it, thereby exhibiting the effect of preventing oxidation at the processing point.

[Brief description of the drawings]

FIG. 1 is a front view showing an entire machine tool including a tool holder with an injection port of the present invention and a main part thereof.

FIG. 2 is a cross-sectional view of a tool holder with an injection port according to the first embodiment of the present invention.

FIG. 3 is an end view of a tool holder with an injection port according to the first embodiment of the present invention.

FIG. 4 is an end view of a tool holder with an injection port according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Machine tool 3 Main shaft 5A Taper part 5B Flange part 7 Holding cylinder 7A Outer end face 11 Main shaft head 20 Supply source 22 Cutting oil tank a Cutting edge SG Splash guard G Non-combustible gas G 'Barrier K Suction recovery device H1 Tool holder with injection port H2 Tool holder with injection port N Passage N1 Injection port T Tool (knife) P Working point W Work

Claims (2)

[Claims] 1. A tool holder which is inserted into and held in a tip hole of a main spindle, wherein an opening is formed in a part of a tip surface of a holding cylinder for gripping a tool of the tool holder, and an injection port is formed in a direction from the injection port to a tool edge. A tool holder with an injection port, characterized by injecting non-combustible gas into the tool. 2. The tool holder with an injection port according to claim 1, wherein a plurality of injection ports are provided at a tip end surface of the holding cylinder.