JP2002126941A - Fluid jetting device for broaching machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluid jetting device for a broaching machine capable of feeding fluid such as cutting coolant or air at uniform pressure and quantity to an outer periphery of a broach with easy clearance adjustment and easy installation. SOLUTION: This fluid jetting device is equipped with an axial hole 2 for passing a broach 21, a peripheral cut part 11 formed in the inner-periphery surface of the axial hole, and a fluid feeding port 8 for feeding fluid. The cut part is formed facing at least passing broaching teeth. A clearance is formed between the axial hole and the outer periphery of the broach, and the peripheral cut part is communicated with the fluid feeding port. An annular feeding passage 6 open to the peripheral cut part is formed outside the peripheral cut part and is communicate with the fluid feeding port through a communicating passage 9. The peripheral cut part forms an orthogonal plane of a conical surface relative to its axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for supplying a cutting coolant, a coolant mist for semi-dry processing, or air in dry cutting to a surface of a broach cutting tool to cool a work, a broach, and discharge cutting chips. The present invention relates to a fluid ejection device for a broaching machine.

[0002]

2. Description of the Related Art Conventionally, cutting coolant used for broaching and air for removing chips adhering to a cutting tool are provided by:
It is guided to the vicinity of the cutting tool by a steel pipe or a resin tube, and a nozzle is attached to the tip of the cutting tool so that the nozzle is ejected toward a desired position. Also, cutting oil (water) agent, air mist,
A so-called nozzle for ejecting a fluid such as air is called a nozzle.
Basically, the ejected material from the nozzle is supplied to the target cutting tool surface only in one specific direction or plural directions, or only in a finite diffusion range of the nozzle. For this reason, the supply pressure and supply amount of the ejected material to the cutting tool become uneven in the circumferential direction of the cutting tool, and the cutting conditions in the circumferential direction of the cutting tool are not uniform.

[0003] For example, in Japanese Patent Application Laid-Open No. 10-6175, a jig having an ejection hole inclined at a predetermined angle with respect to the axial direction and the radial direction of the broaching tool is arranged around the broaching tool. A gap is formed between the jig and the cutting tool, and by jetting into the gap, the coolant is uniformly supplied to the cutting tool, and chips generated by air blow holes separately provided below the work are removed.

[0004]

However, in this method, it is difficult to uniform the ejected material depending on the clearance between the cutting tool and the jig in the first place, and in the method of removing chips by the air blow holes, the uniformity is not uniform in the circumferential direction of the cutting tool. It is difficult to secure the chip removal capability. Therefore, in the present invention, the cutting coolant or the like supplied in the form of a liquid or a mist is supplied uniformly to the outer periphery of the broaching tool in the circumferential direction of the cutting tool without adjusting the gap or with simple mounting. It is another object of the present invention to make the chip removing effect uniform in the circumferential direction of the cutting tool.

[0005]

According to the present invention, there is provided an axial hole through which a broach cutting tool passes, a circumferential cut formed on an inner peripheral surface of the axial hole, a fluid supply port for supplying fluid. The cut is formed so as to face at least the broach blade passing therethrough, and the axial hole and the outer periphery of the broach blade have a gap, and the circumferential cut and the fluid supply port are The above-mentioned problem has been solved by providing a fluid ejection device for a broaching machine which is in communication.

That is, a fluid ejection device for a broaching machine according to the present invention is mounted on a broaching machine so that the broaching tool passes through a hole in the axial direction. Spouted uniformly toward. When the broach has a blade on the entire circumference of the broach such as a round broach, the circumferential cut also opens linearly over the entire circumference, and the fluid from the fluid supply port is uniformly supplied in the circumferential direction of the broach blade. You.

[0007] In order to uniformly jet from the circumferential cut, it is necessary to increase the depth of the cut to a certain extent or to devise the arrangement of the fluid supply port. Therefore, in claim 2, an annular supply passage opening outside the circumferential cut is provided outside the circumferential cut, and the circumferential cut and the fluid supply port are communicated via the supply passage. I did it.

Since the annular supply passage is provided between the fluid supply port and the circumferential cut, a fluid flows in the direction of the circulation along the supply passage, and is supplied under stable conditions to the circumferential cut. The flow of the ejected fluid becomes uniform. The jet flows in a spiral shape as viewed in a plane perpendicular to the axis, or jets toward the center.

On the other hand, it is desired that the jet flow is horizontal or obliquely upward, downward, or the like when viewed from the direction perpendicular to the axis. Therefore, if the circumferential cut forms a plane perpendicular to the axis, the horizontal cut forms a conical surface with respect to the axis (claim 3). It is possible to blow up or down obliquely.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partial sectional view of a broaching machine to which a fluid ejection device for a broaching machine according to the present invention is attached.
FIG. 2 is a plan view of the ejection device of FIG. 1 as viewed from above. As shown in FIG. 1, a work mount 23 of a broaching machine (not shown)
The work 22 is placed on the top. Inner surface 2 of work 22
A plurality of cutting blades 21a are provided on the outer peripheral surface of the cutting blade 2a.
The round broach 21 in which the height a is gradually increased is processed by pulling it downward as viewed in the drawing. Code 21
b is a front grip for pulling the broach downward. Above the workpiece 22, a fluid ejection device for a broaching machine (hereinafter simply referred to as an ejection device) 1
Are arranged so that the broach 21 can pass through the axial hole 2. In addition, below the work mount 23, the same jetting device 1 as the upper side is disposed below through a mounting portion (not shown) so that the broach 21 can pass through the axial hole 2.

The ejection device 1 is constructed by laminating and fixing an upper nozzle 3 and a lower nozzle 4. Upper nozzle 3 and lower nozzle 4
Are formed with an upper axial hole 2a of the axial hole 2 and a lower axial hole, respectively, and the lower nozzle is formed in a flat plate shape. On the other hand, the upper nozzle 3 is provided with an annular step portion 5, an annular supply passage 6, and a fixing portion 7 adjacent to the upper axial hole 2a in order toward the outside. The fixed portion 7 is provided with a fluid supply port 8 for introducing a fluid from an external fluid supply device, and a communication path 9 for communicating the fluid supply port with the supply passage 6 is provided. The step 5 of the upper nozzle 1 and the upper surface 4a near the axial hole of the lower nozzle 4 form a circumferential cut 10 along the entire inner peripheral surface of the axial hole 2. The cut 10 opens to face the cutting blade 21 a of the broach 21.

In this jetting device, when a predetermined fluid is supplied from the fluid supply port, the fluid reaches the supply passage 6 through the communication passage 9 as shown in FIG. It reaches the cut 10 while forming, and from the linear opening (cut) 10 formed over the entire circumference,
Broach 21 through which fluid passes while machining axial hole 2
The fluid is supplied toward the blade. By providing the direction of the communication passage 9 at a predetermined angle with respect to the supply passage 6, the circulation direction of the fluid in the supply passage 6 is controlled, and the cutting coolant or air supplied to the cut 10 in the circumferential direction is controlled. The direction of the flow can be appropriately determined. The fluid can supply cutting coolant such as oil-based coolant to the upper ejection device to reduce friction and heat generation, and supply air to the lower ejection device to remove chips. In FIG. 1, the fluid supply port 8 and the communication path 9 are arranged in a straight line.

Further, in the jetting device for supplying cutting oil or mist coolant shown in the upper part of FIG. 1, it is better that the cutting blade 21a and the jetting cut 10 are as close as possible, while the chip discharging part shown in the lower part of FIG. It is necessary to make a gap between the cutting blade 21a and the axial hole 2 of the jetting device so that chips easily fall. In addition, the ejection amount varies depending on the pressure and the total area of the cut, and the width and the length are appropriately determined according to the use condition. It will be. For example, an outer diameter φ27.
In the case of the round broach No. 5, the inner diameter of the upper coolant axial hole 2 is φ30, with a gap of 1.25 mm on one side, and the lower coolant discharge axial hole has an inner diameter of φ35, one side of 3. The gap was set to 75 mm. The width of the cut is 0.3
To 0.2 mm, and the supply pressure was 0.3 to 0.4 MPa. Good results have been obtained with such dimensions. Although the width of the cut is a small value such as 0.3 to 0.2 mm, it can be easily realized by configuring the structure of the present embodiment, and a smaller width such as 0.05 mm is used. Gaps can also be made.

In FIG. 1, the circumferential cut 10 is
The ejected fluid is made perpendicular to the axial direction of the broach blade. However, as shown in FIG. 3, the step of the upper nozzle 13 is formed diagonally upward, and the lower nozzle 14 has a lower axial hole. 2
By forming the vicinity of b into a conical shape and laminating the upper and lower nozzles, a diagonal upper circumferential cut 11 is formed, and a conical (umbrella) -shaped fluid film-like jet flow can be obtained. Conversely, if it is reversed, a circumferential cut is formed diagonally downward, and a funnel-shaped jet flow can be obtained. Further, in FIG. 1, the same ejection device is used for the upper and lower parts, but different ejection parts may be used. In addition, it is self-evident that it can be used in any position and quantity.

Further, the circumferential cut may not extend over the entire circumference of the axial hole or may not be circular. For example, when the cutting blade does not cover the entire circumference, such as a flat broach or a Christmas tree broach, a circumferential cut is opened at a portion corresponding to the cutting blade, and the cross section is approximated to the cross section of the broach. By providing an annular supply passage on the outside, a uniform jet can be obtained. Similarly, the present invention can be applied to various broaches such as a square broach and a hexagon broach, without being limited to the round broach shown in FIG. Further, it is preferable that the circumferential cut and the annular supply passage are open all around each other, but a part of the column or the positioning pin is provided in a range that does not hinder the uniformity of the jet flow from the circumferential cut as much as possible. There may be a support wall or the like.

[0016]

According to the jetting device of the present invention, the cutting coolant or the air is supplied to the entire circumferential area of the cutting edge of the broach where the circumferential cut forming the linear opening faces the opposing cutting edge. The supply state of the fluid on the circumference of the cutting blade became uniform, the pressure and the amount of the fluid were supplied uniformly, and the chip removing effect was also made uniform in the circumferential direction of the cutting tool. In addition, since the cuts are formed in the circumferential direction, the manufacture thereof is simple, the gap adjustment is unnecessary or easy, and the mounting is simple. Further, since the annular supply passage is provided outside the cut, a more uniform jet flow can be obtained.

Furthermore, since the width of the cut in the circumferential direction can be easily obtained, the width of the cut is appropriately set to provide an effect of increasing the pressure and flow velocity of the supplied cutting coolant and air. In addition, even if the supply pressure of the supplied cutting coolant and air to the jetting device is increased, there is no unevenness in the circumferential direction of the cutting tool. Furthermore, since the jet fluid is jetted linearly toward the inside of the hole, all of the jet fluid is supplied to the target position on the cutting tool, so that there is no waste, and the supply is efficiently and economically supplied. In addition, since the ejection pressure of the supplied material is concentrated on the cutting tool, it is expected that the ability to surely allow the cutting coolant to reach the processing portion and the ability to remove chips are improved. Particularly in the case of a round broach, it is more effective to jet the ink over the entire circumference.

[Brief description of the drawings]

FIG. 1 is a partial sectional view showing an embodiment of a broaching machine to which a fluid ejection device for a broaching machine according to the present invention is attached.

FIG. 2 is a plan view of the ejection device of FIG. 1 as viewed from above.

FIG. 3 is a partial sectional view showing another embodiment of the fluid ejection device for a broaching machine of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Fluid ejection device for broaching machines 2 Axial hole 2a Upper axial hole 2b Lower axial hole 3, 13 Upper nozzle 4, 14 Lower nozzle 5 Annular stepped part 6 Annular supply passage 7 Fixed part 8 Fluid supply Mouth 9 Communication path 10 Circumferential cut 21 Broach 21a Broach cutting blade 21b Gripping part 22 Work 22a Work inner surface 23 Work mount

Claims (4)

[Claims] 1. An axial hole through which a broach cutting tool passes, a circumferential cut formed on an inner peripheral surface of the axial hole, and a fluid supply port for supplying a fluid, wherein the cut is at least. It is formed facing the broach blade that passes,
A fluid ejection device for a broaching machine, characterized in that the axial hole and the outer periphery of the broach blade have a gap, and the cut in the circumferential direction communicates with the fluid supply port. 2. An annular supply passage opening outside the circumferential cut is provided outside the circumferential cut, and the circumferential cut and the fluid supply port communicate with each other via the supply passage. The fluid ejection device for a broaching machine according to claim 1, wherein: 3. The fluid jetting device for a broaching machine according to claim 1, wherein the circumferential cut forms a plane perpendicular to an axis. 4. The fluid jetting device for a broaching machine according to claim 1, wherein the circumferential cut forms a conical surface with respect to an axis.