JP2004318276A - Machining method and device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a machining method and device capable of reducing the manufacturing cost of a work. <P>SOLUTION: Use condition of a tool, and a limit for determining the propriety of use of the tool from the use history of the tool to be used for machining are previously determined, and machining is performed according to the use conditions, where tools of which use history has reached the limit are replaced. The progress till reaching the limit is divided into a plurality of ranges and the use conditions are determined for every divided range. Machining is performed with changing the use conditions of the tool every time the use history of the tool exceeds the range and when the use level of the tool reaches the limit, the tool is replaced to another tool of the same kind. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention determines the use conditions of a tool and a limit value for determining whether or not the use of the tool is possible based on the history of use of the tool to be used for machining, and performs machining in accordance with the use conditions to perform machining. The present invention relates to a processing method and a processing apparatus for replacing a tool whose history has reached a limit value.
[0002]
[Prior art]
FIG. 2 is a schematic diagram showing the relationship between the number of holes and the amount of deviation (variation) from a target value when drilling with fixed processing conditions.
As shown in the figure, when a hole is machined by a drill with the machining condition fixed, the machining accuracy decreases as the number of machined holes increases. Therefore, the processor performs test processing, determines processing conditions (the number of rotations of the drill, the cutting speed, and the like) in terms of processing efficiency and processing accuracy, and sets an upper limit value for processing (for example, in the case of a printed circuit board processing machine, The upper limit is about 3000.). By doing so, processing excellent in processing accuracy and processing quality could be performed.
[0003]
[Problems to be solved by the invention]
However, the number of drills used for processing is reflected in the manufacturing cost of the processed work. For this reason, there is a limit in reducing the manufacturing cost of the work.
[0004]
An object of the present invention is to provide a processing method and a processing apparatus capable of solving the above-mentioned problems in the conventional technology and reducing the manufacturing cost of a work.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the first means of the present invention is a tool using conditions, and a limit value for determining whether or not to use the tool from the history of use of the tool to be used for machining, In advance, the machining is performed in accordance with the use conditions, and in the machining method in which the use history has been changed to a tool that has reached the limit value, the progress up to the limit value is divided into a plurality of ranges. The working conditions are determined for each of the divided ranges, and each time the use history of the tool exceeds the range, machining is performed while changing the use conditions of the tool, and when the use degree of the tool reaches the limit value, The tool is replaced with another tool.
[0006]
Further, the second means of the present invention includes a use condition setting means for setting use conditions of the tool, a limit value setting means for setting a plurality of limit values for evaluating the use degree of the tool, Means for storing the use history, tool exchange means, and tool holding means for holding a plurality of tools, wherein machining is performed while exchanging tools by the machining method according to the first means. I do.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
The inventor conducted a test on how the processing accuracy changes in accordance with the number of processing holes while changing processing conditions.
FIG. 1 is a schematic diagram showing the relationship between the number of holes when processed according to the present invention and the amount of deviation from a target value. The position where the amount of deviation was measured is the position of the hole at the exit (back surface) of the drill of the third substrate. It is shown by the average value of the variation + 3σ (where σ is the standard deviation).
Here, the processing conditions are as follows.
(1) Drill diameter: 0.12mm
(2) Drill rotation speed: 160,000 rotations per minute (3) Work material: Double-sided board (12 μm thickness of copper foil on one side)
(4) Sheet thickness of work: Three sheets of 0.4 mm in thickness. In the figure, the dotted line indicates a cutting speed F of 1.6 m per minute, and the solid line indicates a cutting speed F of 1 to 4000 pieces. In the case of 1.6 m / min and 4001 to 10,000 pieces, the cutting speed F is 1.12 m / min.
Also, A in the figure represents the variation from 1 to 2000 holes, B represents the variation from 1 to 4000 holes, C represents the variation from 1 to 6000 holes, and D represents the variation from 1 to 6000 holes. E represents a variation from 1 to 8000, and E represents a variation from 1 to 10000 holes.
[0008]
As shown in the figure, it can be seen that when the cutting speed is reduced to 1.12 m / min from the 4001 th cutting, the processing accuracy is improved. Therefore, for example, when a variation of 40 μm or less is required as the processing accuracy, the limit value is conventionally increased from about 4000 to about 6000, that is, the number of drills used is reduced to about 60%. Therefore, the production cost of the work can be reduced.
[0009]
As described above, according to the present invention, the working limit value can be increased without lowering the processing accuracy, so that the manufacturing cost of the work can be reduced.
[0010]
In this example, the case where the cutting speed is changed only once has been described. However, when an appropriate condition can be found, the cutting speed is not limited to once, and may be changed plural times.
[0011]
Although the cutting speed is changed here, the so-called dwell, which is the number of rotations of the drill or the time from the completion of positioning of the drill at the processing point to the start of cutting into the work, may be changed.
[0012]
Although the case where the processing speed is changed only once has been described here, the processing speed may be changed a plurality of times.
[0013]
The changed conditions include not only the case where the cutting speed is reduced but also the case where the cutting speed is increased.
[0014]
Further, the system includes a use condition setting unit for setting a use condition of a tool, a unit for storing a history of use for each tool, a tool exchange unit, and a tool holding unit for holding a plurality of tools, so that machining of a workpiece is performed. If a processing machine that is operated unattended is provided with limit value setting means for setting a plurality of limit values for evaluating the history of use of tools, the number of drills used passes, so the same drill is prepared. In this case, the time for continuous processing can be lengthened. Further, maintenance of the tool is facilitated.
[0015]
Although the case of drilling has been described above, for example, in the case of an apparatus for processing the outer shape of a printed board using an end mill, the cutting speed may be changed during processing.
[0016]
【The invention's effect】
As described above, according to the present invention, the use condition of the tool and the limit value for determining whether or not the use of the tool can be used based on the history of use of the tool to be used for machining are determined in advance, In a machining method for performing machining in accordance with the use conditions and exchanging a tool whose use history has reached the limit value, a process until reaching the limit value is divided into a plurality of ranges, and each of the divided ranges is divided into a plurality of ranges. The working conditions are determined in advance, and the working is performed while changing the use conditions of the tool each time the use history of the tool exceeds the range, and when the use degree of the tool reaches the limit value, the tool is replaced with another one. Since the tool is replaced, the production cost of the work can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing the relationship between the number of holes and the amount of deviation from a target value when machining according to the present invention.
FIG. 2 is a schematic diagram showing the relationship between the number of holes and the amount of deviation from a target value when drilling is performed under fixed processing conditions.

Claims (5)

The use condition of the tool and a limit value for determining whether or not the tool can be used from the use history of the tool to be used for machining are determined in advance, and machining is performed according to the use condition, and the use history is determined. In a machining method that replaces the tool that has reached the limit value,
Dividing the progress up to the limit value into a plurality of ranges and setting use conditions for each of the divided ranges,
Perform the processing while changing the use conditions of the tool each time the use history of the tool exceeds the range, and replace the tool with another of the tools when the use degree of the tool reaches the limit value,
A processing method characterized in that: The processing method according to claim 1, wherein the limit value is the number of holes to be processed. The processing method according to claim 1, wherein the limit value is a cutting length to be processed. The method according to claim 1, wherein the use condition includes any one of a rotation speed of the tool, a cutting speed of the tool, and a dwell. Use condition setting means for setting use conditions of a tool, limit value setting means for setting a plurality of limit values for judging whether or not the use of the tool can be used based on the history of use of the tool to be used for machining, and the tool Means for storing a use history for each, said tool exchange means, and tool holding means for holding a plurality of tools,
A machining apparatus which performs machining while changing tools by the machining method according to claim 1.

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