JP2793840B2 - Method of measuring tool diameter of machine tools - Google Patents

Description

The present invention relates to a tool for a machine tool, for example, a machine tool for measuring whether or not a drill of a printed board processing machine has a predetermined diameter. It relates to a tool diameter measuring method.

[Conventional technology]

In recent years, the number of machine tools that perform machining while exchanging a large number of tools having different diameters has increased. Hereinafter, a printed circuit board processing machine will be described as an example of the machine tool. In a printed circuit board, the mounting density of electronic components mounted on the printed circuit board has been increased, so that the diameter of a drill for drilling a printed circuit board has been reduced, and the type of drill has also been greatly increased accordingly. . On the other hand, printed circuit board processing machines are often operated for a long time, and it is necessary to prepare a large number of drills having the same diameter.

Normally, the drill is manually set in a storage position determined for each drill diameter in the storage device of the printed circuit board processing machine.During the processing, the printed circuit board processing machine automatically changes the drill and executes the processing. I have. That is, when there is a drill exchange command, the drill used so far is automatically returned to the position where the drill was stored, and then a drill that matches the command is automatically taken out from another storage position.
This drill exchange is performed accurately without erroneous selection of the storage position. However, as described above, since the types and the number of drills are increasing, erroneous setting of the drill storage position by hand, that is, setting of a drill of another diameter to the storage position of the drill diameter to be originally set is performed. Many mistakes have been made. This error is
After drilling all holes, it was discovered by inspecting the printed circuit board, but such inspection requires a lot of trouble and time, and there is a hole with a diameter different from the predetermined diameter In this case, there is a problem that the printed circuit board must be discarded.

In order to solve such a problem, recently, when a drill is mounted on a printed circuit board processing machine, a drill diameter inspection device that detects the diameter of the drill has been considered. Hereinafter, this apparatus will be described with reference to the drawings.

FIG. 3 is a plan view of the drill diameter detecting device. In the figure, 1
Is a light source, 2 and 3 are lenses, and 4 is a light receiving element array, and these constitute a drill diameter detecting device 5. Reference numeral 6 denotes a drill. The drill 6 has a cross-sectional shape shown in more detail in FIG. 4, and the diameter of the drill 6 is defined by a maximum dimension D.

When detecting the diameter of the drill 6, the drill 6 to be detected automatically removed from a predetermined storage position of the storage device is used.
Is inserted perpendicularly to the paper at the position shown in FIG. 3 with the light source 1 turned on. In this case, the light from the light source 1 is
Are converted into parallel rays, and are converged by the lens 3 and projected on the light receiving element row. At this time, a shadow is produced due to the presence of the drill 6 as shown by hatching. In order to reflect the maximum dimension D on the wall, after the drill 6 is rotated at a low speed, the maximum dimension D, that is, the drill diameter can be detected by checking the maximum number of shaded light receiving elements in the light receiving element row 4. it can.

Using the drill diameter detecting device 5 described above, the drill 6
By detecting the diameter of the printed circuit board, the intended drilling can be accurately performed on the printed circuit board. Then, the drill 6 is replaced and used repeatedly until the set number of drilling times is reached, and the drill diameter is detected each time the replacement is performed.

[Problems to be solved by the invention]

By the way, in drilling a printed circuit board, cuttings such as copper foil and resin are often wound around the drill 6, and when the use of the drill 6 is completed and the drill 6 is replaced with another drill, the drill 6 is used. Is stored in a predetermined location of the storage device while the cuttings such as copper foil and resin are wound. Then, when the drill is used next time, when the drill diameter is detected by the drill diameter detecting device 5, the drill diameter is erroneously detected due to the swarf of the wrapped copper foil or resin, and the specified correct diameter is detected. A situation occurs in which the installation of the drill is stopped despite the selection of a drill having a diameter.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in the prior art, and to provide a tool diameter measuring method for a machine tool capable of performing reliable detection and improving work efficiency.

[Means for solving the problem]

In order to achieve the above object, the present invention manages the location of tools, and in a machine tool that performs processing by replacing and mounting a plurality of tools having different diameters, data on whether or not a tool has been used is provided for each tool. It is characterized in that the data is stored, the data of the tool to be replaced is checked at the time of tool replacement, and only when the tool to be replaced is an unused tool, the diameter of the tool is measured.

[Action]

For each tool, data for determining whether the tool has been used so far or has never been used, for example, data on the number of machining holes is stored. And
At the time of tool change, it is determined whether the tool to be replaced is unused (the number of machined holes in the above example), and only if the tool has not been used before (the number of machined holes is 0 in the above example) Measure the diameter of the tool.

〔Example〕

 Hereinafter, the present invention will be described with reference to the illustrated embodiments.

FIG. 1 is a flowchart illustrating a method for measuring a drill diameter according to the present invention, and FIG. 2 is an explanatory diagram of data storage in a storage unit. The operation of the printed board processing machine is controlled by the NC device. This NC device is provided with a storage unit, and this storage unit stores a drill number, a number of drilled holes, and processing conditions as shown in FIG. Where "drill number"
Is a number assigned to the drill set at each storage position in the drill storage device of the printed circuit board processing machine, and the diameter of the drill to be stored is determined for each storage position. In this sense, the drill number is determined by the storage position. "Drill diameter" indicates the diameter of the drill to be stored in the storage position. The “number of drills” means the number of holes drilled by the drill numbered, and one is added to the number for each drill. Then, the upper limit of the number is predetermined, and when the number of drills reaches the upper limit, the drill is not used, and a drill having the same diameter set in another storage position and not reaching the upper limit is used. It will be used for replacement. The storage unit stores processing conditions such as a drill rotation speed and a feed depth when performing drilling, but the description is omitted because it is not relevant to the present invention. Figure 2 shows that the No. 1 drill with a diameter of 0.1 mm has been used for drilling 150 times, the No. 2 drill with a diameter of 0.2 mm has not been used, and the No. 3 drill with a diameter of 0.3 mm has drilled 500 times. The case where it is used for processing is shown.

Next, a method for measuring a drill diameter will be described with reference to a flowchart shown in FIG. In processing a printed circuit board, a predetermined processing procedure stored in a tape or the like is read by an NC device. In this method of measuring the diameter of a drill, it is always determined whether or not the NC device has read a drill exchange and has output a drill exchange command (see the procedure shown in FIG. 1).
S ₁ ). Next, whether the drill diameter which is designated by the drill change command is in the storage device is determined if (Step S ₂₎ no alarm is issued (Step S _3). The clerk sets the required drill in a predetermined storage position by this alarm. If there is a drill having the specified diameter, the number of the drill (replacement target drill number) is temporarily stored in the “replacement target drill number storage register” (step S ₄ ), and then the drill is read by the check of the printed circuit board processing machine. It is grasped retrieved from storage position (Step S _5). Then, drilling speed of the drill, read from the data storage unit shown in Figure 2 with reference to drill number (Step S _6), also the diameter of the drill is read from the data storage unit ( Step S _7).

Then, the taken out earlier data drilling speed of the drill 0 whether it is determined (Step S _8), if 0, that is, the drill if the drill unused, shown in FIG. 3 drill diameter measurements are performed with a drill diameter detecting device 5 (Step S _9). Then, the measurement results, compared with the drill size measurements data retrieved in step S ₇ (Step S _10), if they match, a drill of the specified diameter by a drill exchange command its drill, replacement signal indicating that a variable is output (Step S _11). On the other hand, if the measurement result in Step S ₁₀ does not coincide with the drill axis length set value, i.e., an alarm is issued when the drill has been connexion excisional erroneously to the storage position (Step S _12). Then, the drill is automatically returned to the original storage position by the printed circuit board processing machine, and the attendant knows the erroneous setting by an alarm and resets the drill having the predetermined diameter in the storage position. Procedure When the drilling speed in S ₈ is determined to be not 0 (already drilled used), the measurement of the drill diameter is processed immediately not performed steps S ₁₁ is performed.

Thus, omitting the drill diameter measurements of the drill already used, it is already a checking the drill diameter according to the procedure S ₈ to S ₁₀ for the first time of use (when drilling exchange) of the drill, and, By managing the tool placement location, the drill removed from the storage position is automatically returned to the original storage position when the drill is replaced. As a result, drill diameter measurement is performed only on unused drills to which no chips are attached, preventing erroneous measurement beforehand, and greatly reducing drill diameter measurement to improve work efficiency. Can be improved.

In the description of the above embodiment, the method of measuring the drill diameter of the printed circuit board processing machine has been described by way of example.

〔The invention's effect〕

As described above, according to the present invention, at the time of drill exchange,
Since the drill diameter is measured only for unused drills, erroneous measurement due to the attachment of chips can be prevented.
In addition, the number of drill diameter measurements can be significantly reduced, and the working efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a drill diameter measuring method according to an embodiment of the present invention, FIG.
FIG. 3 is a plan view of the drill diameter measuring device, and FIG. 4 is a sectional view of the drill. 5 ... Drill diameter measuring device, 6 ... Drill.

Continuation of the front page (72) Inventor Hiroyuki Kamata 2100 Kamiimaizumi, Ebina-shi, Kanagawa Hitachi Seiko Engineering Co., Ltd. (56) References JP-A-2-237730 (JP, A) JP-A-2-56543 (JP, U) (58) Field surveyed (Int.Cl. ⁶ , DB name) B23Q 17/22

Claims (1)

(57) [Claims] In a machine tool which manages a tool arrangement location and exchanges and mounts a plurality of tools having different diameters, data on whether or not a tool has been used is stored for each tool. A tool diameter measuring method for a machine tool, wherein the data of a tool to be replaced is checked, and only when the tool to be replaced is an unused tool, the diameter of the tool is measured.