JPH0724542U - Machine tool injection nozzle - Google Patents

Abstract

(57) [Abstract] [Purpose] By effectively rectifying the coolant flowing in the injection nozzle, the injection angle of the coolant injected from the injection port can be made small and concentrated on the machining site between the workpiece and the tool. An injection nozzle of a machine tool that can inject a coolant. A plurality of small-diameter circulation holes 4a, 4b, ... Are formed in the injection nozzle 1 in parallel with the axis of the injection nozzle 1 and in such a manner that the length l of the hole with respect to the hole diameter d is a predetermined ratio or more. ,
It is characterized in that the fluid supplied from the flow passage on the machine tool main body side is jetted from the jet port through the circulation hole.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an injection nozzle of a machine tool capable of intensively injecting a fluid (coolant) such as a cutting agent or an abrasive into a machining site of a workpiece and a tool.

[0002]

[Prior art]

 In cutting or grinding, it is common to inject a coolant such as a cutting agent or an abrasive to the processing site in order to remove heat, chips, etc. generated at the processing site of the workpiece. By the way, as a spray nozzle (hereinafter referred to as a nozzle) that sprays the coolant onto the machining area between the workpiece and the tool, a U-shaped passage is formed at the front end of the spindle head that rotatably supports the spindle. The formed front cover is attached. A plurality of nozzles are provided on the front cover so as to radially extend at predetermined intervals and to project into the U-shaped passage. The nozzle is swingably attached to the front cover, and by adjusting the direction of the injection port, it is possible to accurately inject the coolant to the machining site between the workpiece and the tool.

[0003]

[Problems to be solved by the device]

 However, in the nozzle as described above, the coolant flowing in the U-shaped passage flows into the nozzle whose axis is orthogonal to the U-shaped passage, so that the flow of the coolant in the nozzle becomes turbulent. The turbulent coolant is rectified by the nozzle and jetted from the jet port if the length of the nozzle is sufficiently longer than the hole diameter of the nozzle. However, in a machine tool or the like having an automatic tool changing function, if the nozzle length is increased, interference with the tool or the change arm may occur, and the nozzle length cannot be increased. Therefore, a nozzle with a short length is used, and the coolant is sprayed in a turbulent state, so the spray angle of the coolant becomes large. In other words, there is a problem in that the coolant cannot be intensively sprayed onto the processed parts of the workpiece and the tool, resulting in poor efficiency.

The present invention has been made in view of the above problems, and an object of the present invention is to effectively rectify the coolant flowing in the injection nozzle to inject the coolant injected from the injection port. (EN) An injection nozzle for a machine tool, which has a small angle and can inject the coolant intensively to the processing parts of the workpiece and the tool.

[0005]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the injection nozzle of the machine tool of the present invention uses a fluid such as a cutting agent supplied from the flow passage provided on the machine tool main body side to the machining site between the workpiece and the tool. A jet nozzle of a machine tool for jetting toward a plurality of small-diameter flow holes, each having a predetermined length, parallel to the axis of the jet nozzle, and having a predetermined length. The fluid supplied from the above is ejected from the ejection port through the fluid circulation hole.

[0006]

[Action]

 Since the present invention is constructed as described above, it operates as follows. The fluid that has flowed into the jet nozzle from the flow passage on the machine tool body side is jetted from the jet port toward the machining site of the workpiece and tool through a plurality of small-diameter fluid circulation holes formed in the jet nozzle. It At this time, the flow of the fluid is effectively rectified in the fluid circulation hole, so that the ejection angle of the fluid ejected from the ejection port becomes small, and the fluid can be concentratedly ejected to the processing portion.

[0007]

【Example】

 A preferred embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a nozzle of the present invention, (a) is a cross-sectional plan view of a nozzle provided with a multiple pipe section in which a plurality of thin tubes are bundled, and (b) is a nozzle XX of (a). It is a sectional view. The nozzle 1 is swingably attached to the base body 2 via a spherical attachment member 3. The multiple pipe portion 4 forming a through hole through which the coolant flows is arranged on the central axis of the nozzle 1 and has a single thin tube 4a having a hole diameter sufficiently smaller than the hole diameter of the nozzle 1, and this thin tube. It is composed of six thin tubes 4b, 4b, ... Arranged in parallel around the thin tube 4a with the same length as the thin tube 4a. It is desirable that the thin tubes 4a and 4b have a length which is several times or more the hole diameter, and preferably 10 times or more.

By configuring the nozzle 1 as described above, the flow of the coolant is rectified in the thin tubes 4a, 4b, 4b ... And the injection angle of the coolant injected from the injection port becomes small. That is, as shown in FIG. 3, the coolant that has flowed into the nozzle 1 in a turbulent state is rectified in the thin tubes 4a, 4b, 4b. Therefore, the injection angle α of the coolant injected from the injection port can also be reduced.

Using the nozzle 1 configured as described above, a coolant injection test was conducted with the test apparatus shown in FIG. 2, and changes in the injection angle α of the coolant injected from the injection port were investigated. In the test apparatus of FIG. 2, a flow passage 5a is formed in the fixed block 5 to which the nozzle 1 is attached, and a rated output of 1.5kw and a discharge pressure of 15MPa are provided in the flow passage 5a via a coolant supply pipe 6. The trochoid pump 7 having the capability of (megapascal) is connected.

The nozzle 1 used in the test is a conventionally known nozzle (total length L = 20 mm, hole diameter D = φ4 mm), and a multi-pipe portion made of a thin tube of 1 / d = 5 (total length 1, hole diameter d), This is provided with a multiple pipe section made of thin tubes of 1 / d = 10. The trochoid pump 7 is operated and the first condition: when the coolant is injected under the discharge pressure of 0.1 MPa and the flow rate of 3 l / min (low pressure, low capacity) and the second condition of higher pressure and higher capacity than the first condition. Condition: The injection angle α of the coolant of each nozzle 1 was measured when the coolant was injected at a discharge pressure of 1.5 MPa and a flow rate of 15 l / min. In addition, the same test was performed on a conventionally known nozzle to compare the effects. The results are shown in the table below.

[0011]

[Table 1]

As is clear from the results in this table, it was confirmed that the nozzle 1 provided with the multiple pipe portion 4 has a small coolant injection angle α regardless of the discharge pressure of the trochoid pump 7. . Further, the larger the l / d ratio of the multiple pipe section 4, the greater the effect. That is, it is shown that the rectifying effect of the coolant is larger as the l / d ratio of the multiple pipe section 4 is larger. It should be noted that the results of this test show a large difference in effect between the thin-tube injection nozzle with l / d = 5 and the conventionally known nozzle with l '/ d' = 4. This is because the rectifying effect of the multiple pipe portion and the rectifying effect of the conventionally known nozzle act synergistically.

Although an embodiment of the present invention has been described, it is not limited in any way by this embodiment of the present invention. For example, in the above embodiment, the description has been made assuming that the multiple pipe portion formed by bundling a large number of thin tubes is provided in the nozzle, but a partition is provided in the nozzle over a predetermined length, and a small-diameter flow hole is formed in the nozzle. A large number of holes may be provided in the direction parallel to the axis line of.

[0014]

[Effect of device]

 According to the nozzle of the present invention, the spray angle of the coolant sprayed from the spray port can be made small, so that the coolant can be sprayed intensively on the workpiece and the machining portion of the tool, and The tool can be cooled efficiently.

[Brief description of drawings]

FIG. 1 is a cross-sectional plan view of a nozzle according to the present invention, in which FIG. It is an X sectional view.

FIG. 2 is a schematic explanatory view of a nozzle testing device of the present invention.

FIG. 3 is a sectional view illustrating the operation of the nozzle of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle 2 Base material 3 Mounting member 4 Multiple pipe parts 4a, 4b Thin tube (flow hole) 5 Fixed block 5a Flow passage 6 Coolant supply pipe 7 Trochoid pump

Claims (1)

[Scope of utility model registration request] 1. An injection nozzle of a machine tool for injecting a fluid such as a cutting agent supplied from a flow passage provided on the machine tool main body side toward a machining portion of a workpiece and a tool, In the injection nozzle, a plurality of small-diameter circulation holes are formed parallel to the axis of the injection nozzle, and the length of the hole with respect to the hole diameter is equal to or more than a predetermined ratio, and the fluid supplied from the flow passage is flowed through the flow passage. An injection nozzle for a machine tool, characterized in that the injection is performed from the injection port through a hole.