JPH04336910A - Cutter for outline machining - Google Patents

Abstract

PURPOSE:To sufficiently cool the cutting section of a cutter at a cutting process, and protect a cutter groove against the accumulation of chips generated at the process. CONSTITUTION:A cutter 1 is caused to rotate at the predetermined speed, and the air is concurrently introduced to a hole 4 formed through the axial center of the cutter 1 in a direction from the upper end to the tip thereof. The air, when introduced, flows through the hole 4, and is blown outside from a plurality of through-holes 5 at the side of the cutting section 3 of the cutter 1. In this case, the cutter 1 is cooled with the air, and a temperature rise due to cutting can be restrained at a low level. Consequently, the chips of a workpiece (printing circuit board) generated due to the rotation of the cutter 1 are blown by the air jetted through the holes 5 at the groove of the cutter 1, thereby preventing the chips from adhering to the cutter 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutter for machining the external shape of a workpiece, and more particularly to a cutter for machining the external shape of a workpiece that is suitable for machining a workpiece containing a synthetic resin that melts due to heat during machining. .

0002

2. Description of the Related Art Generally, when processing the outer shape of a printed circuit board into a predetermined shape, an outer shape processing machine is used, which performs cutting by rotating an end mill-like cutter at high speed. When the outer shape of a printed circuit board is processed using this outer shape processing machine, the cutter becomes hot due to the heat generated by the friction between the cutter and the printed circuit board during the outer shape processing. When fine chips of synthetic resin generated during cutting come into contact with the hot cutter, the heat from the cutter melts the chips and firmly adheres to the cutter. Increased adhesion of such chips not only reduces the sharpness of the cutter, but also increases friction with the workpiece, and further increases the temperature of the cutter.

[0003] Conventionally, therefore, an air nozzle is provided near the spindle that rotates while holding the cutter, and the cutter is cooled during cutting by spraying air onto the side surface and tip of the cutter. There is.

0004

[Problems to be Solved by the Invention] However, with conventional cutters, once cutting is started, the cutter blade (printed circuit board contact part) is hidden in the processing groove, causing the cutter to Since air is not applied to the blade portion of the cutter and a sufficient cooling effect cannot be obtained, there is a problem in that the blade edge of the cutter becomes brittle due to the heat generated during cutting and the life of the cutter is shortened.

[0005] Furthermore, since air is not applied to the cutter blade sufficiently, chips around the cutter blade remain uncollected.
There is a problem that the cutter adheres to the groove of the cutter and an excessive cutting load is applied to the cutter during cutting, causing the cutter to break.

[0006] The present invention provides a workpiece that can sufficiently cool the blade of a cutter during cutting and can prevent chips generated during cutting from adhering to the groove of the cutter. The purpose is to provide a cutter for external shape processing.

[0007]

[Means for Solving the Problems] In order to achieve the above object, the cutter for machining the outer shape of a workpiece according to the present invention has the following features:
A hole is formed in the shaft center part from the upper end to the vicinity of the tip in the axial direction, and a plurality of through holes are formed in the groove to penetrate the hole,
The air introduced through the hole is blown out through the through hole.

[0008]

[Operation] At the same time as this cutter is rotated at a predetermined rotation speed, air is introduced into the hole formed in the axial center of the cutter from the upper end toward the tip. When air is introduced into the hole, the air passes through the hole in the cutter and is blown out from a plurality of through holes formed on the side surface of the blade of the cutter. At this time, the cutter is cooled by air, and the temperature rise due to processing can be kept low. Therefore, the chips of the workpiece (printed circuit board) cut by the rotation of the cutter are blown away by air ejected from the plurality of through holes formed in the groove of the cutter, and are no longer attached to the cutter.

[0009]

[Examples] Examples of the present invention will be described below. 1 to 6 show an embodiment of a cutter for contour processing according to the present invention. FIG. 1 is an overall configuration diagram of a cutter for external processing according to the present invention, FIG. 2 is a view taken along arrow A shown in FIG. 1, FIG. 3 is a sectional view taken along line B-B shown in FIG. 1, and FIG. FIG. 5 is a cross-sectional view of the spindle shown in FIG. 4, and FIG. 6 is a diagram showing the overall configuration of a cutter for contour processing according to the present invention applied to a contour processing machine for printed circuit boards. FIG. 6 is a cross-sectional view of the spindle shown in FIG. It is a figure showing the flow of air when performing external shape processing.

In the figure, reference numeral 1 denotes a cutter for contour machining, which is attached to a contour machining machine and rotates at a predetermined number of revolutions.
By moving on the Y-axis, a predetermined cutting process is performed. Reference numeral 2 denotes a shank portion, which is formed in the shape of a round bar and is gripped by a collet chuck or the like. Reference numeral 3 denotes a blade portion which makes a hole in the workpiece by moving on the Z axis and cuts the workpiece by moving in the X-Y axis direction. Reference numeral 4 denotes a hole, which is formed in the axial direction of the cutter 1 for external processing from the upper end of the shank portion 2 to the vicinity of the tip of the blade portion 3, as shown in FIG. Air to which a predetermined pressure is applied is sent into the hole 4 by a blower (not shown). Reference numeral 5 denotes a through hole, which is formed in the groove of the blade part 3 through the hole 4 as shown in FIG.
There are multiple locations. This through hole 5 allows the air sent into the hole 4 to be blown out from the inside of the blade portion 3 to the outside.

In FIG. 4, reference numeral 10 denotes a printed circuit board contour processing machine, which processes the printed circuit board into a predetermined shape. 11 is the bed. A table 12 is movably supported by the bed 11. Reference numeral 13 denotes an X-axis motor that drives an X-axis ball screw (not shown) that moves the table 12 in the X direction (front-back direction in the figure). 14 is an X-axis pulse encoder, which numerically controls the amount of rotation of the X-axis ball screw driven by the X-axis motor 13 (the amount of movement of the table 12 in the X direction by the X-axis ball screw) as a pulse signal via the signal cable 30. Output to device 31.

23 is a cross slide, cross rail 1
It is movably attached to 6. 27 is a Y-axis ball screw for moving the cross slide 23 in the Y direction. 28 is the Y-axis motor, cross rail 1
6 and rotates the Y-axis ball screw 27. 29 is a Y-axis pulse encoder which converts the amount of rotation of the Y-axis ball screw 27 driven by the Y-axis motor 28 (the amount of movement of the cross slide 23 in the Y direction by the Y-axis ball screw 27) into a pulse signal via the signal cable 30. and outputs it to the numerical control device 31.

A saddle 15 is movably attached to the cross slide 23. 24 is a Z-axis ball screw for moving the saddle 15 in the Z direction. A Z-axis motor 25 is placed on the cross slide 23 and rotates the Z-axis ball screw 24. 26 is a Z-axis pulse encoder that measures the amount of rotation of the Z-axis ball screw 24 driven by the Z-axis motor 25 (Z-axis ball screw 24
(the amount of movement of the saddle 15 in the Z direction) is output to the numerical control device 31 via the signal cable 30 as a pulse signal.

17 is a spindle, which is a cutter 1 for contour processing;
It is for attaching. 18 is pressure foot,
It is supported by a saddle 15 via a cylinder 20 that is always urged toward the table 12. A brush 19 is attached to the tip of the pressure foot 18 and presses the printed circuit board against the table 12 when processing the printed circuit board. 21 is a dust collecting hose, the tip of which is attached to the pressure foot 18. Reference numeral 22 denotes a dust collector, to which the rear end of the dust collection hose 21 is connected, and the dust collection device 22 collects chips that fly up inside the pressure foot 18 during cutting.
Collect via 1.

Further, the spindle 17 shown in FIG. 4 has a configuration as shown in FIG. That is, a rotary shaft 34 is rotatably provided at the axial center of the spindle 17 via bearings 32 and 33. 35 is a motor for rotating the rotating shaft 34. 36 is the rotor shaft, the rotation axis 3
It is slidably inserted through the axis of 4. 37 is an air hose, which is attached to the rotor shaft 36 with a joint 38. 39 is a collet chuck, and cutter 1 for external processing.
It is something to hold.

Next, the operation of this embodiment will be explained. A printed circuit board is placed on the table 12. Then, the cutter 1 for contour machining is attached to the collet chuck 39. Thereafter, the motor 35 is driven to rotate the cutter 1 for contour processing, and air is supplied from the air hose 37. Then, the Y-axis motor 28 and the X-axis motor 13 are operated to position the cutter 1 for contour machining to the starting point of machining the printed circuit board. Furthermore, the Z-axis motor 25 is activated to move the spindle 17 in the Z direction to perform cutting to a specified depth at the starting point of processing the printed circuit board. When the cutter 1 for contour processing reaches a predetermined depth, the table 12
By moving the saddle 15 in the X and Y axes, the required cutting feed is performed and the outer shape of the printed circuit board is processed.

During this cutting process, the air supplied to the hole 4 of the cutter 1 for contour machining is blown from the hole 4 through the through hole 5 from the inside of the blade portion 3 to the outside, and is cut by the cutter 1 for contour machining. The chips generated during this process are scattered into the pressure foot 18. That is, while the cutter 1 for contour processing rotates in the direction of arrow C shown in FIG.
When cutting is performed by moving in the direction shown in FIG. As shown in E, the chips are ejected in all directions of the machining groove 40, and the chips generated during cutting can be scattered into the pressure foot 18 without staying within the machining groove 40. In the figure, 41 is a printed circuit board, 42 is a printed circuit board 41
This is the lower board on which the In addition, by blowing out air from the through hole 5 of the cutter 1 for contour processing in this way,
The heat generated by cutting can be cooled down, and the temperature rise of the cutter 1 for contour processing can be suppressed to a low level. . The chips scattered in the pressure foot 18 are collected by a dust collector 22 via a dust collection hose 21 connected to the pressure foot 18.

Therefore, according to the present embodiment, even when the cutting process is started and the blade portion 3 of the cutter 1 for contour machining is hidden in the kerf, air flows through the hole 4 of the cutter 1 for contour machining.
Since the jet is ejected from the inside of the blade part 3 to the outside through the through hole 5, the blade part 3 of the cutter 1 for contour machining, which is heated by the heat generated during cutting, is sufficiently cooled down. It is possible to prevent the lifespan from decreasing.

Furthermore, according to the present embodiment, air is ejected from the inside of the blade portion 3 to the outside through the hole 4 of the cutter 1 for contour machining and the through hole 5. It can be ejected in the direction of the cutting groove, and can scatter chips generated by cutting with the cutter 1 for contour processing.

According to this embodiment, the spindle 1
When air is supplied to the collet chuck 39 of the spindle 18 when the cutter 1 for contour machining is not held, this air is ejected from the center of the collet chuck 39 of the spindle 18, and when the cutter 1 for contour machining is attached/detached, chips are deposited inside the collet chuck 39. This also has the effect of reducing troubles with the collet chuck 39.

[0021]

According to the present invention, the blade portion of the cutter for contour processing can be sufficiently cooled during cutting, and it is possible to prevent chips from adhering to the groove portion.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a cutter for contour processing according to the present invention.

FIG. 2 is a view taken along arrow A shown in FIG. 1;

FIG. 3 is a cross-sectional view taken along line BB shown in FIG. 1;

FIG. 4 is an overall configuration diagram in which the cutter for processing the outer shape of a workpiece according to the present invention shown in FIG. 1 is applied to a machine for processing the outer shape of a printed circuit board.

FIG. 5 is a cross-sectional view of the spindle shown in FIG. 4;

6 is a diagram showing the flow of air when the outer shape of a printed circuit board is processed by the outer shape processing machine shown in FIG. 4; FIG.

[Explanation of symbols]

1……………………Cutter for external processing 2……………………shank part ３……………………Blade part ４……………………hole 5……………………Through hole

Claims (1)

[Claims] 1. A hole is formed in the axial center part reaching from the upper end to the vicinity of the tip in the axial direction, and a plurality of through holes are formed in the groove to pass through the hole, and the air introduced from the hole is passed through the through hole. A cutter for external shape machining, characterized by ejecting water through the hole.