JP4611555B2 - Suction cutting machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a suction type cutting machine that includes a tool attached to a main shaft via a cylindrical tool holder and performs cutting while suctioning and removing chips.
[0002]
[Prior art]
Conventionally, as a suction type cutting machine of this type, according to Japanese Patent Laid-Open No. 6-55401, a suction duct member is attached to the outer periphery of an intermediate part of a tool holder via a bearing, and is attached to a shaft part of a tool inserted into the tool holder. A shaft hole reaching the blade portion at the tip is formed, and the shaft hole is communicated with the suction duct member through a radial through hole formed in the shaft portion and the tool holder, so that chips generated in the cutting process can be What is known to be removed by suction through a hole is known.
[0003]
[Problems to be solved by the invention]
The above conventional example is effective when cutting a workpiece such as graphite in which powder-like chips are generated because the cross-sectional area of the shaft hole is limited. When a workpiece such as FC material or aluminum material is cut, the shaft hole is easily clogged, and chips cannot be sucked well.
[0004]
In view of the above, the present invention has an object to provide a suction type cutting machine capable of efficiently removing suction even when relatively large pieces of chips are generated.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the present invention provides a suction cutting machine that includes a tool attached to a main shaft via a cylindrical tool holder, and performs cutting while sucking and removing chips. A suction duct member that forms a flange portion and is connected to the suction device is provided so as to surround the flange portion, and an inner peripheral portion of the flange is formed on the outer peripheral surface of the shaft portion of the tool from the blade groove of the blade portion at the tip of the shaft portion. A suction groove extending over the suction groove is formed, and a suction hole is formed in the flange portion to communicate the suction groove with the suction duct member.
[0006]
According to the present invention, chips are sucked into the suction duct member through the concave hole and the suction hole. Here, since the concave hole is formed in the tool holder, the cross-sectional area can be made larger than the shaft hole formed in the shaft part of the tool as in the conventional example, and relatively large piece-like chips are generated. Even clogging does not occur. Further, since the suction hole is formed in the flange portion of the tool holder, a large centrifugal force acts on the chips in the suction hole, and the chips are efficiently conveyed to the suction duct member. Thus, even if a relatively large piece of chips is generated, it can be efficiently removed by suction.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Referring to FIG. 1, reference numeral 1 denotes a spindle head, 2 denotes a main shaft pivotally supported on the spindle head 1, and an adapter 3 is fitted and fixed to the main shaft 2 at a shank portion 3 a at its tail end (upper end). A tool for reaming is attached to the chuck portion 3b at the tip (lower end) via a tool holder 4.
[0008]
As clearly shown in FIGS. 2 and 3, the tool is composed of a tip 5 fixed to the tip of the tool holder 4 by brazing or the like, and does not have a shaft portion inserted into the tool holder 4. The tip 5 is provided with a pair of point-symmetric lands 50, 50 projecting radially outward from the tip of the tool holder 4, and an axial tip edge on the side surface in the counter direction in FIG. 3 of each land 50. The cutting edge 51 is formed with a radially outer edge.
[0009]
Further, a sleeve 6 that is pivotally supported via a bearing 6 a is provided on the outer periphery of the adapter 3, and a cutting fluid passage 6 b connected to a cutting fluid joint 7 attached to the spindle head 1 is formed in the sleeve 6. Further, a cutting fluid passage 3 c communicating with the cutting fluid passage 6 b is formed in the adapter 3, and the cutting fluid is supplied to the cutting fluid inflow port 40 formed in the tail end portion of the tool holder 4 through the cutting fluid passage 3 c. Like to do. Then, a pair of discharge ports 42, 42 communicating with the inflow port 40 through the lateral holes 41 are formed at the tip of the tool holder 4 so as to reach the pair of lands 50, 50 of the chip 5. 50 is provided with a discharge hole 52 that matches the discharge port 42 so that the cutting fluid is supplied to the chip 5.
[0010]
Further, a flange portion 43 is formed on the outer periphery of the tool holder 4, and the tool holder 4 is axially forward (downward) through the blade grooves 53, 53 between the pair of lands 50, 50 in the tool holder 4. An axially recessed hole 44 is formed so as to reach the inner periphery of the flange portion 43. The recessed hole 44 is formed in a bowl shape having a larger portion facing the blade grooves 53, 53. In addition, the suction duct member 8 that surrounds the flange portion 43 is connected to the sleeve 6, and a pair of suction holes 45, 45 are formed in the flange portion 43 so that the concave hole 44 communicates with the suction duct member 8. The suction duct member 8 is provided with a connection port 8 a for connecting a suction device 9 such as a vacuum pump, and a chip collection box 10 is provided in the middle of the path from the connection port 8 a to the suction device 9. Has been. In the figure, reference numeral 43a denotes a labyrinth seal projection edge formed at the tail end (upper end) of the outer peripheral surface of the flange portion 43.
[0011]
According to the above configuration, when cutting the workpiece with the tip 5 by the rotation of the main shaft 2, the chips are sucked into the suction duct member 8 through the concave holes 44 and the suction holes 45, and the chips are collected in the collection box 10. Collected.
[0012]
Here, since the recessed hole 44 is formed in the tool holder 4, unlike the hole formed in the axial part of the tool inserted in a tool holder like the past, a cross-sectional area can be taken large, FC material, aluminum material, etc. Even if a relatively large piece of chips is generated by cutting the workpiece, the chips are not clogged in the concave hole 44. When the chips reach the suction hole 45, a large centrifugal force due to the rotation of the flange portion 43 acts on the chips, and the chips are efficiently conveyed to the suction duct member 8 by the suction force and the centrifugal force.
[0013]
In the above-described embodiment, the tool tip 5 is used for reamer processing, but the present invention can be similarly applied to the case of using a tip for another cutting tool such as an end mill.
[0014]
【The invention's effect】
As is apparent from the above invention, according to the present invention, relatively large pieces of chips can be efficiently removed by suction, and productivity is improved.
[Brief description of the drawings]
1 is a partially cut side view of an essential part of an example of a processing machine of the present invention. FIG. 2 is a longitudinal sectional view of a tool holder. FIG. 3 is a bottom view seen from the direction of arrow III in FIG.
2 Spindle 4 Tool holder 43 Flange 44 Recess 45 Suction hole 5 Tip 51 Cutting blade 53 Blade groove 8 Suction duct member 9 Suction device

Claims (1)

In a suction type cutting machine equipped with a tool attached to the main shaft via a tool holder and performing cutting while removing chips by suction,
A flange is formed on the outer periphery of the tool holder, and a duct member connected to the suction device is provided so as to surround the flange,
The tool is composed of a tip having a cutting edge fixed to the tip of the tool holder,
A suction hole is formed in the tool holder so as to reach the inner periphery of the flange portion in the axial direction and open in the axial direction through the blade groove of the tip. The suction hole communicates with the duct member in the flange portion. Formed a hole,
A suction-type cutting machine characterized by that.

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