JP2015098077A - Internal broaching machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal broaching machine which need not replace a jig or adjust the position of a nozzle thereby to facilitate lubrication, washing, and cut chip discharge even if broach tools of different twist directions are used.SOLUTION: In an internal broaching machine 1 for working an axial groove of a prepared hole of a workpiece by inserting a broach tool 5 into the prepared hole 2a of the workpiece 2 thereby to relatively move the broach tool and the workpiece, above or below the workpiece, there are stacked a first nozzle 6 for injecting fluid such as lubricant liquid, mist, or air toward the outer circumference 5b of the broach tool obliquely to a broach tool shaft C, and a second nozzle 7 for injecting the fluid inversely obliquely from the first nozzle.

Description

  The present invention relates to an inner surface broaching machine, and more particularly to an inner surface broaching machine provided with a lubrication or chip discharging mechanism between a broaching tool and a workpiece of the inner surface broaching machine.

  Conventionally, internal broaching is known for drilling holes such as internal gears, internal key grooves, and internal spline grooves. In the inner surface broaching process, a rod-shaped broach tool provided with a large number of cutting edges in the axial direction and the outer periphery is inserted into a hollow hole of the work, and the work and the broach tool are moved relative to each other. Thereby, the axial groove process in the hollow hole of a workpiece | work is processed. In machining, fluid such as grinding fluid, cutting fluid, cooling fluid or air is ejected toward the outer periphery of the broaching tool in the vicinity of the workpiece for lubrication of the workpiece and the cutting edge, cooling or discharging of chips after cutting.

  For example, in Patent Document 1, coolant (cutting fluid, coolant) is ejected in an oblique direction along the twist of a broach tool in which a cutting edge such as a broach tool having a twisted blade groove or a helical broach is twisted. I am letting. In addition, the position of the jet outlet is adjusted in consideration of the lead direction. A jet nozzle is provided in the nozzle arrange | positioned separately, and adjusts the position of a nozzle according to lubrication conditions.

  However, the thing of patent document 1 is complicated because it has to adjust a nozzle separately. Therefore, as in Patent Document 2, a predetermined cutting fluid, air, or the like is even ejected by replacing the jig with a disc-shaped fluid ejection jig through which the broach tool is inserted instead of the nozzle. The jig is provided with a slit-like ejection passage. This jig is provided on the upper side of the workpiece, and lubricating oil is supplied from the ejection passage toward the cutting edge of the broach tool. Further, a jig having a similar slit-shaped ejection passage is also provided on the lower side of the work, and air is ejected from the ejection passage to remove chips after processing. The ejection angle in this case is performed by supplying fluid from an oblique direction along the annular passage. Moreover, it is made to eject in the up-down diagonal direction with respect to the axis | shaft.

  In the thing of patent document 3 which used such a jig | tool much more, the jig | tool provided with the process-fluid ejection path inclined by the predetermined angle with respect to the axial direction and radial direction of a broach tool is arrange | positioned up and down the workpiece | work. Lubricating oil is supplied from the machining liquid ejection passage to the flank side and the rake face side of the cutting edge of the broach tool to lubricate and cool the machining part. Furthermore, an air blow jig for blowing air toward the broach tool is provided below to remove chips after processing. Further, the lubricant is ejected obliquely with respect to the shaft center so as to be separated from the shaft center, and also corresponds to a twisted groove or the like.

JP 2001-269813 A JP 2002-126941 A JP-A-10-006175

  When cutting fluid or the like is ejected obliquely, a jig can be used as it is in the case of a round broach without twisting or a broaching tool in which twisting is in a certain direction. However, when a broaching tool having a reverse twist is used in the same broaching machine, the one that is obliquely ejected becomes reversely oblique and the lubricating performance and the like deteriorate. For this purpose, the jig is replaced or the nozzle position is adjusted as in Patent Document 1. However, if you forget to replace or adjust the jig, there is a risk that problems such as insufficient lubrication may occur. In view of such problems, the problem of the present invention is that even if a broach tool having a different twisting direction is used, there is no need to replace the jig or adjust the position of the nozzle each time, and it is easy to lubricate, clean and discharge chips. It is to provide an internal broaching machine that can be implemented.

  In the present invention, a rod-shaped broach tool having a large number of cutting edges in the axial direction and outer periphery is inserted into the pilot hole of the workpiece, and the broach tool and the workpiece are moved relative to each other, whereby the axial groove of the pilot hole of the workpiece is In an internal broaching machine for machining, a first nozzle that jets a fluid such as a lubricant, mist, or air toward the outer peripheral surface of the broach tool obliquely with respect to the broach tool axis above or below the workpiece And the subject mentioned above was solved by providing the inner surface broaching machine with which the 2nd nozzle which ejects the said fluid to the reverse diagonal direction with respect to the said 1st nozzle is laminated | stacked.

  That is, the first and second nozzles having opposite jet directions are stacked, and the fluid is always supplied to the broach side. Since the ejection directions are opposite to each other, either one of the fluids reliably reaches the cutting edge uniformly with respect to the twisting direction of the broach tool. In addition, in the case of a device having no twisting blade, fluid in both directions reaches the cutting blade uniformly. The first and second nozzles may be either above or below the workpiece, or both, but the first and second nozzles are provided on the same side. Needless to say, another nozzle may be added to the first and second nozzles.

  In the present invention, since the nozzles whose ejection directions are opposite to each other are stacked, the fluid is uniformly or sufficiently supplied to the cutting edge even if the cutting edge of the broach tool is twisted or not. Therefore, it is not necessary to change the ejection direction each time, and the handling becomes easy.

It is a fragmentary sectional view of the broaching machine which is embodiment of this invention. FIG. 2 is a partial cross-sectional view taken along line AA of the first nozzle of FIG. 1. It is a BB line partial sectional view of the 2nd nozzle of Drawing 1.

  Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the broaching machine 1 has a work mounting base 3 on which a work 2 is placed. A through hole 4 is formed in the work mounting base 3 so that a rod-shaped broach tool 5 can be inserted. Further, a pull head (not shown) for gripping the front grip portion of the broach tool 5 and pulling the broach tool 5 downward is provided in the lower part 5a. A large number of cutting edges 5c are provided on the outer periphery 5b of the broach tool 5 so that the rake face faces the front gripping direction. The cutting edge 5c is gradually increased in any one or combination of the blade height, the blade width, and the blade thickness direction so as to sequentially process the workpiece as it advances in the axial direction toward the anti-front grip portion (upward in the drawing). Reference numeral 3a denotes a workpiece attaching jig.

  The workpiece 2 has a lower machining hole 2a to be machined. The broaching tool 5 is inserted into the lower machining hole 2a and the through hole 4, and the workpiece 2 and the broaching tool 5 are moved relative to each other. Gears, splines, keyways, etc. are provided on the inner surface of 2a. The details of the inner surface broaching machine are the same as in the prior art, so the description is omitted.

  Below the workpiece 2, a first nozzle 6 for ejecting air in an oblique direction with respect to the broach tool axis and a second nozzle 7 for ejecting air in an oblique direction opposite to the first nozzle are stacked concentrically. Yes. As shown in FIG. 2, the first nozzle 6 has jet ports 6 a that are opened obliquely to the right with respect to the broach tool axis C and are equally distributed around the axis C. Further, as shown in FIG. 3, the second nozzle 7 has an outlet 7 a that is opened obliquely to the left with respect to the broach tool axis C and is equally disposed around the axis C. An annular passage 8 is formed on the outer periphery of the ejection hole and further communicates with an air supply hole 9 connected to an air supply source (not shown).

  When air is supplied from the air supply hole 9, the air is ejected from the ejection port via the annular passage 8. Since the jet outlet is inclined with respect to the axis C, the jet air 10 of the first nozzle becomes a counterclockwise vortex as seen in FIG. Further, the air 11 ejected from the second nozzle has a clockwise spiral shape as seen in FIG. As a result, air is ejected from both directions. Therefore, even if the torsion of the broach tool 5 is left or right or a broach tool having no twist, the air is not evenly leaked to the cutting edge on the outer periphery of the broach tool. Erupted. Thereby, it becomes possible to remove the machining waste regardless of the twist. Further, since it is not necessary to worry about twisting of the broach tool, setup and work are simplified.

  In the embodiment, the first and second nozzles are provided below the workpiece as an air blow for discharging chips, but may be provided on the workpiece for lubrication. Furthermore, it can be appropriately arranged, for example, provided for lubrication close to the lower side of the workpiece. Needless to say, the ejected fluid can be appropriately applied for lubrication, cooling, chip removal, and the like. Moreover, although the jet nozzle is described as a narrow hole, it may be slit-shaped. In the embodiment, the ejection direction is the lower oblique direction, but may be the upper oblique direction or the direction perpendicular to the axis.

DESCRIPTION OF SYMBOLS 1 Inner side broaching machine 2 Workpiece 2a Pilot hole 5 Broach tool 5b Broach tool outer peripheral surface 6 1st nozzle 7 2nd nozzle C Axis center

Claims (1)

  Inserting a rod-shaped broach tool with many cutting edges in the axial direction and the outer periphery into the pilot hole of the workpiece, and moving the broach tool and the workpiece relative to each other, machining the axial grooving of the pilot hole of the workpiece In the broaching machine, above or below the workpiece, a first nozzle that ejects a fluid such as a lubricant, mist, or air toward the outer peripheral surface of the broach tool in an oblique direction with respect to the broach tool axis; An inner surface broaching machine, wherein a second nozzle that ejects the fluid in an oblique direction opposite to the nozzle is laminated.

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