JP2009202312A - Chip removal system for machine tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a chip removal system for a machine tool in which slotting can be performed in a dried condition by efficiently removing generated chips. <P>SOLUTION: The chip removal system for the machine tool is provided with a form milling cutter 14 driven to rotate around an shaft center and moved to slot a workpiece W, and a suction head 53 of a rear chip removal device 16 for sucking and removing the chips generated out of the workpiece W while moving in a slot Wa of the workpiece W processed by the form milling cutter 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a chip removal system for a machine tool capable of continuously removing chips generated from a workpiece being processed by suction.

  In a machine tool such as a milling machine or a machining center, the workpiece is processed by moving the tool and the workpiece relative to each other. When machining a workpiece of such a machine tool, a large amount of workpiece chip is generated. If this chip accumulates on the surface of the workpiece, the tool or workpiece may be damaged, or the chip may be removed from the machine tool. If it enters the sliding part, there is a possibility that a problem occurs in the positioning accuracy of the workpiece.

  In view of this, conventional machine tools are provided with a chip removal system that removes chips scattered around the workpiece and its periphery during machining. In this chip removal system, a space is formed so as to cover the tool and the work portion of the workpiece, and the chips generated from the workpiece are removed by sucking air in the space. Such conventional chip removal systems for machine tools are disclosed in, for example, Patent Documents 1 and 2.

JP 2000-237828 A JP 2001-129744 A

  However, in the conventional chip removal system for machine tools, cutting oil is used for the purpose of cooling the tool and workpiece, lubricating the frictional portion of the tool, and discharging chips. When cutting oil is used in this way, not only does the cutting oil scatter around the workpiece and its surroundings, the working environment is deteriorated, but the workpiece must be cleaned after machining. Furthermore, when supplying the cutting oil, a cutting oil supply device including a pump or the like is required, which not only increases the size of the machine tool but also consumes a large amount of electric power.

  Moreover, the conventional chip removal system for machine tools is applied to drilling and not applicable to grooving. That is, when groove processing is performed using a conventional chip removal system, chips may remain in the grooves of the processed workpiece, and the chips may not be sufficiently removed.

  Accordingly, the present invention is to solve the above-described problem, and an object thereof is to provide a chip removal system for a machine tool capable of achieving a dry grooving process by efficiently removing generated chips. To do.

A machine tool chip removal system according to a first invention for solving the above-described problems,
A tool for grooving a workpiece by being rotationally driven around an axis and moved;
And a first chip suction unit that moves in a groove of the workpiece processed by the tool and sucks and removes chips generated from the workpiece.

A machine tool chip removal system according to a second aspect of the present invention for solving the above-described problems is provided.
In the machine tool chip removal system according to the first invention,
A space is formed so as to cover the work part of the tool and the workpiece, and second chip suction means for removing chips generated from the workpiece by sucking the space is provided. .

A machine tool chip removal system according to a third aspect of the present invention for solving the above-described problems is provided.
In the machine tool chip removal system according to the second invention,
The tool has a chip guide groove for guiding chips sucked by the second chip suction means.

A chip removal system for a machine tool according to a fourth aspect of the present invention for solving the above-described problem,
In the machine tool chip removal system according to the third invention,
High pressure gas injection means for injecting high pressure gas supplied into the tool into the chip guide groove is provided.

A machine tool chip removal system according to a fifth invention for solving the above-described problems,
In the machine tool chip removal system according to the fourth invention,
Forming the chip guide groove between the outer peripheral cutting edges of the tool;
The high-pressure gas injecting means injects high-pressure gas from the back surface of the outer peripheral cutting edge toward the outside in the tool radial direction.

A chip removal system for a machine tool according to a sixth invention for solving the above-described problems,
In the machine tool chip removal system according to the fourth invention,
The high pressure gas injection means includes
A gas passage formed on the axis of the tool;
It has an injection port which is formed toward the tool radial direction outward from the gas passage, and opens to the back of the outer peripheral cutting edge of the tool.

A machine tool chip removal system according to a seventh aspect of the present invention that solves the above-described problem,
In the machine tool chip removal system according to any one of the first to sixth inventions,
The surface of the tool is coated with a film having resistance to high-temperature oxidation.

  Therefore, according to the chip removal system for a machine tool according to the present invention, it is possible to dry the groove processing by sucking and removing the generated chips in the groove of the processed workpiece.

  Hereinafter, a chip removal system for a machine tool according to the present invention will be described in detail with reference to the drawings. 1 is a schematic configuration diagram of a chip removal system for a machine tool according to the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is a cross-sectional view taken along line AA in FIG. It is the figure which showed these suction heads, Comprising: (a) is a front view, (b) is a front perspective view, (c) is a rear perspective view.

  As shown in FIGS. 1 and 2, a machine tool such as a milling machine or a machining center (not shown) is provided with a head 11 so as to be movable. A spindle 12 is rotatably supported by the head 11, and a tool holder 13 is detachably attached to the tip of the spindle 12, and a general-purpose milling cutter 14 is attached to the tip of the tool holder 13. It is detachably attached. The head 11 is provided with a front chip suction device (second chip suction means) 15 and a rear chip suction device (first chip suction means) 16. A table 17 is provided at a position facing the head 11, and a work (workpiece) W is detachably attached to the table 17.

  The complete milling cutter 14 is for processing a groove Wa in a workpiece W, and is provided with a blade portion 21 at the tip thereof. In the blade portion 21, four outer peripheral cutting edges 23 are formed at equal angular intervals around the axis of the general-purpose milling cutter 14 and along the axis, and between the outer peripheral cutting edges 23. Has a chip guide groove 21 (see FIG. 3). These outer peripheral cutting edges 23 are formed such that the diameter of the cutting edge gradually increases and decreases toward the tip of the tool, and further, a bottom edge 24 is continuously formed at the leading ends. ing. The outer peripheral cutting edge 23 is formed with a rake face 23a, a flank face 23b, and a back face 23c, and a corner formed by the rake face 23a and the flank face 23b forms a cutting edge 23d.

  Further, the gas mill 25 is formed on the axial center of the general-purpose milling cutter 14. A high pressure gas supply device 27 is connected to the proximal end of the gas passage 25, and four injection ports 26 are connected to the distal end thereof. The high-pressure gas supply device 27 supplies high-pressure gas to the gas passage 25 via a supply pipe or a rotary joint passage (not shown) provided in the head 11, the main shaft 12, and the tool holder 13. On the other hand, the injection port 26 is formed outward from the distal end of the gas passage 25, opens to the back surface 23 c of the outer peripheral cutting edge 23 on the distal end side of the blade portion 21, and communicates with the chip guide groove 22. Yes.

  It should be noted that the surface of the blade portion 21 of the complete milling cutter 14 is coated with a TiAlN film or an AlCrSiN film. Further, the gas passage 25, the injection port 26, and the high-pressure gas supply device 27 constitute high-pressure gas injection means.

  The front chip suction device 15 is disposed above the processing portion of the workpiece W and in front of the cutting cutter 14 in the cutting direction at the time of grooving, and includes a suction pump 31 and the suction pump 31. A suction passage 32 whose base end is connected to the pump 31 and a suction head 33 connected to the tip of the suction passage 32 are provided. Further, as shown in FIG. 4, the suction head 33 includes a cylindrical head body 41 and a communication path 42 that connects the head body 41 and the suction path 32.

  The head main body 41 is disposed so as to surround the base end of the blade portion 21 of the general-purpose milling cutter 14 attached to the tool holder 13, and the communication path 42 is connected to the base end of the chip guide groove 22 of the blade portion 21. It opens so as to face each other. That is, the complete milling cutter 14 is attached to and detached from the tool holder 13 through the inside of the head main body 41 of the suction head 33. The clearance between the head main body 41 of the suction head 33 and the total milling cutter 14 is so small that the rotation of the total milling cutter 14 is not affected.

  The rear chip suction device 16 is disposed behind the general milling cutter 14 in the cutting direction in the grooving, and includes a suction pump 51 and a suction passage 52 having a proximal end connected to the suction pump 51. And a suction head 53 connected to the tip of the suction passage 52.

  The suction head 53 is formed in such a size that it can be placed in the groove Wa of the workpiece W processed by the general-purpose milling cutter 14. In addition, a plurality of (four in the figure) suction ports 53 a are formed on the front surface of the suction head 53, and these suction ports 53 a are arranged in the axial direction of the total milling cutter 14.

  Therefore, when grooving the workpiece W using the general-purpose milling cutter 14, first, the front chip suction device 15 and the rear chip suction device 16 are fixed to the head 11, and then the total shape milling cutter 14 is used. It is inserted into the suction head 33 of the front chip suction device 15 and attached to the spindle 12 via the tool holder 13. A work W is attached to the table 17.

  Next, the total milling cutter 14 is rotated by the main shaft 12 and the head 11 is moved to process the front chip suction device 15 and the rear chip suction device 16 together with the total shape milling cutter 14 with a two-dot chain line in FIG. Move to start position.

  When the high-pressure gas supply device 27 is driven, high-pressure gas is injected from the injection port 26 into the chip guide groove 22 through the gas passage 25. Further, when the suction pump 31 of the front chip suction device 15 is driven, the gas around the total milling cutter 14 is sucked from the head body 41 and the communication passage 42 of the suction head 33 through the suction passage 32. . On the other hand, by driving the suction pump 51 of the rear chip suction device 16, the gas around the total milling cutter 14 is sucked from the suction port 53 a of the suction head 53 through the suction passage 52.

  Next, the machining of the groove Wa having a predetermined cross-sectional shape is started on the workpiece W by moving the total milling cutter 14 in a direction perpendicular to the axis (cutting direction shown in FIG. 1). In the groove processing, so-called dry cutting is performed without using cutting oil.

  Thereby, the suction head 33 of the front chip suction device 15 has a minute gap between the surface of the workpiece W and the movement of the total shape milling cutter 14, while the total shape milling cutter 14 and the workpiece W are moved. It will move over the workpiece. On the other hand, the suction head 53 of the rear chip suction device 16 moves in the groove Wa machined into the workpiece W so as to follow the total milling cutter 14 from the rear in the cutting direction.

  At this time, since the surface of the blade portion 21 of the total milling cutter 14 is coated with a TiAlN film or an AlCrSiN film, even when exposed to a high-temperature oxidizing atmosphere, the generated oxide becomes a very dense oxide film. Ingress of oxygen is prevented. As a result, the dry cut causes a decrease in lubricity and high-temperature cutting, but these problems are solved by a film excellent in high-temperature oxidation resistance.

  Further, since the high-pressure gas supplied by the high-pressure gas supply device 27 passes through the gas passage 25 of the general-purpose milling cutter 14 and is injected from the injection port 26 at the outer peripheral cutting edge 23 on the tip side of the blade portion 21. The total milling cutter 14 and the workpiece W are effectively cooled.

  Moreover, since the injection port 26 is formed on the back surface 23c of the outer peripheral cutting edge 23, the high-pressure gas used for cooling is located outward from the back surface 23c in the tool radial direction, that is, rearward in the tool rotation direction. The outer peripheral cutting edge 23 is sprayed toward the cutting edge 23d (rake face 23c). Thereby, the generated chips are immediately separated from the blade part 21, and the separated chips are quickly discharged along the chip guide groove 22 to the base end side of the blade part 21.

  The chips discharged to the base end side of the chip guide groove 22 are further increased in vigor by the suction action of the suction pump 31 of the front chip suction device 15, and the suction passage 32 extends from the head body 41 and the communication path of the suction head 33. Is removed. In addition, since the base end side of the chip guide groove 22 is disposed in the head main body 41 and faces the communication path 42, the transfer of chips from the chip guide groove 22 to the suction path 32 is performed smoothly.

  On the other hand, when the groove processing is performed, the chips generated from the workpiece W are scattered in the processed groove Wa, but the suction of the suction head 53 by the suction action of the suction pump 51 of the rear chip suction device 16. It is removed from the mouth 53a through the suction passage 52.

  Therefore, according to the chip removal system for a machine tool according to the present invention, the chip removal performance is improved by the gas suction action of the chip suction devices 15 and 16 and the gas push-out action of the high pressure gas supply device 27, and the high pressure gas. The gas supply action of the supply device 27 improves the cooling performance of the general-purpose milling cutter 14 and the workpiece W, and further, the high-temperature oxidation resistance is improved by coating the blade 21 of the general-purpose milling cutter 14. be able to. As a result, since the effect can be compensated for by not using the cutting oil, it is possible to realize a dry grooving process.

  As a result, since the cutting oil does not scatter around the workpiece W and its surroundings, it is possible to reduce the deterioration of the working environment and make it unnecessary to clean the workpiece after processing. In addition, since a cutting oil supply device that supplies cutting oil is not required, maintenance of the cutting oil is not required, and an increase in the size of the machine tool can be prevented and power consumption can be reduced. .

  The present invention is applicable to a chip removal system for machine tools that can easily perform chip disposal.

It is a schematic block diagram of the machine tool chip removal system which concerns on this invention. It is a principal part enlarged view of FIG. It is AA arrow sectional drawing of FIG. It is the figure which showed the suction head of a front chip suction device, Comprising: (a) is a front view, (b) is a front perspective view, (c) is a rear perspective view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Head 12 Main axis | shaft 13 Tool holder 14 Total form milling cutter 15 Front chip suction device 16 Back chip suction device 17 Table 21 Blade part 22 Chip guide groove 23 Outer peripheral cutting blade 24 Bottom blade 25 Gas passage 26 Injection port 27 High pressure gas supply device 31 , 51 Suction pumps 32, 52 Suction passages 33, 53 Suction head 41 Head body 42 Communication passage W Work Wa Groove

Claims (7)

A tool for grooving a workpiece by being rotationally driven around an axis and moved;
A chip removal system for a machine tool, comprising: a first chip suction unit that moves in a groove of a workpiece processed by the tool and sucks and removes chips generated from the workpiece. In the machine tool chip removal system according to claim 1,
A space is formed so as to cover the work part of the tool and the workpiece, and second chip suction means for removing chips generated from the workpiece by sucking the space is provided. Chip removal system for machine tools. In the machine tool chip removal system according to claim 2,
The tool has a chip guide groove that guides the chips sucked by the second chip suction unit. In the machine tool chip removal system according to claim 3,
A chip removal system for machine tools, comprising high-pressure gas injection means for injecting high-pressure gas supplied into the tool into the chip guide groove. The machine tool chip removal system according to claim 4,
Forming the chip guide groove between the outer peripheral cutting edges of the tool;
The chip removal system for a machine tool, wherein the high-pressure gas injection means injects high-pressure gas from the back surface of the outer peripheral cutting edge toward the outside in the tool radial direction. The machine tool chip removal system according to claim 4,
The high pressure gas injection means includes
A gas passage formed on the axis of the tool;
A chip removal system for a machine tool, characterized by having an injection port that is formed outwardly in the tool radial direction from the gas passage and opens on a back surface of an outer peripheral cutting edge of the tool. In the machine tool chip removal system according to any one of claims 1 to 6,
A chip removal system for a machine tool, wherein the surface of the tool is coated with a film having high-temperature oxidation resistance.

Images