JP7180960B2 - Board drilling device and board drilling method - Google Patents

Description

The present invention relates to a board drilling apparatus and a board drilling method, for example, which inspects the state of a drill before drilling a printed board.

The drill inspector as described above is designed to detect the diameter of the drill, the position of the cutting edge (tip), etc., and to display an error in the event of an abnormality. The position of the cutting edge (tip) is also necessary to know where the cutting edge is with respect to the vertical feed position of the spindle that holds the drill, for example, when controlling the drilling depth in blind hole drilling. It is.
Patent Literature 1 discloses a substrate drilling apparatus equipped with a drill tester as described above.

JP 2016-120563 A

In the board drilling device, not only unused new drills, but also drills to be used for the next processing after the previous processing is completed (hereinafter referred to as reusable drills as necessary) are returned from the spindle and stored in the drill cassette. is stored in
In conventional board drilling equipment, drills are inspected by a drill inspector every time before processing. It may not be detected. For this reason, in the case of blind hole machining in which the machining depth must be accurately controlled, there is a drawback that the depth accuracy cannot be ensured.
Patent Literature 1 does not mention the problem of using a reusable drill with chips and dust adhering to the tip.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to ensure depth accuracy even when a reusable drill with chips and dust adhering to its tip is used.

Among the inventions disclosed in the present application, a typical board drilling apparatus includes a discriminating means for discriminating whether a drill used for processing is unused or reused, and inserting the drill mounted on a spindle to detect the tip of the drill. and a drill inspector for inspecting a position, and determining the machining depth of the blind hole based on the tip position detected by the drill inspector, wherein the discriminating means determines that the blind hole is to be reused. With regard to the drill, the machining depth of the blind hole is determined based on the tip position detected when the drill is determined to be unused.

Further, among the inventions disclosed in the present application, a typical substrate drilling method is capable of determining whether a drill used for processing is unused or reused, and the drill mounted on a spindle is sent to a drill inspector. In a board drilling method in which a drill is inserted to inspect the tip position of the drill and the drilling depth of the blind hole is determined based on the tip position, the drill determined to be reused is determined to be unused. It is characterized in that the machining depth of the blind hole is determined based on the position of the tip detected when the tool is pressed.

According to the present invention, depth accuracy can be ensured even when a reusable drill with chips and dust attached to its tip is used.

4 is a flowchart for explaining the operation of detecting the cutting edge position of a drill in one embodiment of the present invention; 1 is a schematic configuration diagram of a substrate drilling apparatus according to an embodiment of the present invention; FIG. FIG. 3 is a diagram for explaining the structure of the drill tester in FIG. 2; 3 is a diagram showing a storage state of a storage unit in FIG. 2; FIG.

An embodiment of the present invention will be described below.
FIG. 2 is a schematic configuration diagram of a board drilling apparatus according to an embodiment of the present invention.
In FIG. 2, 1 is an apparatus base serving as the base of the apparatus, and 2 is a processing table driven in the X direction by a drive mechanism (not shown) on the apparatus base. A plurality of printed circuit boards 3, which are to be processed, are placed on the processing table 2 although there are two in this case. Reference numeral 4 denotes a gate-shaped column mounted on the apparatus base 1, arranged so as to straddle the processing table 2, and driven in the Y direction by a drive mechanism (not shown) on one of the vertical surfaces of the gate-shaped column 4. A cross slide 5 is mounted.

Spindles 6 are mounted on the cross slide 5 so as to correspond to the printed circuit boards 3 placed on the processing table 2 , and the spindles 6 are movably mounted on the portal column 4 . The plurality of spindles 6 are synchronized with each other and driven in the vertical direction (Z direction) by a vertical drive mechanism (not shown). A drill 7 is held by the spindle 6 and used to process the printed circuit board 3 . A sub-chuck 8 is attached to the spindle 6 and moves together with the spindle 6 in the Z direction. Reference numerals 9 and 10 denote a supply tool post and a discharge tool post respectively placed on the processing table 2, and 11 denotes a drill cassette in which new drills and old drills are discriminated and placed on the processing table 2. .

Reference numeral 12 denotes a drill tester having a function of detecting the diameter, cutting edge position, etc. of the drill 7 held by the spindle 6, and is operated by inserting the drill 7 from above.
A supply tool post 9, a discharge tool post 10, a drill cassette 11 and a drill tester 12, one each corresponding to the spindle 6, are installed near the printed circuit board 3 to be processed. A display unit 16 serves to convey various types of information to the operator. Reference numeral 17 denotes an overall control unit for controlling each unit of the apparatus, which is realized by, for example, a program-controlled processing unit.
As described above, the structure in which a plurality of spindles 6 are mounted on the portal column 4 and the tool posts and the like are arranged in correspondence with the spindles 6 is intended to increase the amount of machining at one time. commonly known as a device.

FIG. 3 is a diagram for explaining the schematic structure of the drill tester 12. As shown in FIG. In FIG. 3, only parts related to the present invention are shown.
3, reference numeral 21 denotes a hole held by the spindle 6 and into which the drill 7 is inserted; 22, light emitters 22 and 23, which are provided in the middle of the hole and emit light in the lateral direction; optical sensors for receiving light from the light emitter 22; is. In this drill inspector 12, the drill 7 is inserted into the hole 21, and the optical sensor 23 detects when the light from the light emitter 22 is blocked by the cutting edge of the drill 7. As shown in FIG.

The substrate drilling apparatus of FIG. 2 operates as follows under the control of the overall control section 17. As shown in FIG. Here, the operation of detecting the cutting edge position of the drill 7 using the drill inspector 12 will be described with reference to the flow chart of FIG.
The overall control unit 17 is designed to keep track of the time used for the machining operation of the drill 7, and the storage unit 18 stores the time for each drill 7 stored in the drill cassette 11. The remaining time Tr obtained by subtracting the time actually used for machining from the life time Tm (never used) is stored together with the drill identification information d indicating whether the drill has been used.
That is, as shown in FIG. 4A, remaining times Tr1, Tr2, Tr3, . . . are stored corresponding to the drill identification information d1, d2, d3, .

When a machining operation is commanded, first, the designated drill 7 is transferred from the drill cassette 11 to the supply tool post 9 by the sub-chuck 8 (step 1). Align to the upper position (step 2).
Next, it is determined whether or not the remaining time Tr of the drill 7 is equal to the life time Tm (step 3). (steps 4 and 5), and when light is no longer detected by the optical sensor 23, stop the descent of the drill 7 (step 6). A cutting edge position is obtained based on the feed amount, and stored as a cutting edge detection position P in the storage unit 18 together with the drill identification information (step 7).
On the other hand, in step 3, if the remaining time Tr is less than the life time Tm, that is, if the drill is a reused drill that has been used once, the cutting edge position detection operation is omitted, and another Inspect (step 8).

Since the above operations are performed each time a machining operation is commanded, the storage unit 18 stores the drill identification information d and the cutting edge detection position P for each drill 7 that is used for the first time.
That is, as shown in FIG. 4B, feed cutting edge detection positions P15, P6, P11, . .

Next, in the inspection at step 8, if no abnormality is detected, the machining operation is started.
In the machining operation, the cutting edge detection position P corresponding to the drill 7 mounted on the spindle 6 is read from the storage unit 18, and when machining a blind hole, how far the spindle 6 is to be vertically fed, that is, the machining depth. is determined based on the cutting edge detection position P.
Incidentally, as disclosed in Japanese Patent Laid-Open No. 2003-1509 (paragraph 0004), when adopting a method of switching the feed speed of the spindle 6 before and after the drill 7 comes into contact with the printed circuit board 3, this switching point is It may be determined based on the cutting edge detection position P.

When the drill 7 is reused, there is a possibility that chips and dust are attached to the tip of the drill 7 and the cutting edge detection position of the drill tester 12 is not correctly detected.
According to the above embodiment, when the drill 7 is reused, the cutting edge position detection operation is not performed, and the machining depth is determined based on the cutting edge detection position P detected when the drill 7 is used for the first time. Therefore, it is possible to ensure the depth accuracy when machining blind holes.

Although the present invention has been specifically described above based on the embodiments, it goes without saying that the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. , including various modifications.
For example, in the above embodiment, if the drill is a reusable one, the operation for detecting the position of the cutting edge is omitted. The machining depth may be determined based on the detected cutting edge detection position. This simplifies the processing routine of the drill tester.
In addition, regardless of whether the drill is new or not, the operation of detecting the cutting edge position is performed each time. If it is within the range, the difference may be treated as not due to the influence of chips or dust, and the machining depth may be determined based on the detected position of the cutting edge when reused.

1: equipment base, 2: processing table, 3: printed circuit board, 4: portal column,
5: cross slide, 6: spindle, 7: drill, 8: sub-chuck,
9: supply tool post, 10: discharge tool post, 11: drill cassette,
12: drill tester, 16: display unit, 17: overall control unit, 18: storage unit,
21: hole, 22: light emitter, 23: optical sensor

Claims (4)

A discriminating means for discriminating whether a drill used for processing is unused or reused, and a drill inspector for inserting the drill mounted on the spindle and inspecting the position of the tip of the drill, and detected by the drill inspector. In a board drilling apparatus that determines the machining depth of a blind hole based on the determined tip position, the drill determined to be reused by the determination means is detected when the drill is determined to be unused. A substrate drilling apparatus, wherein a machining depth of a blind hole is determined based on the tip position. 2. The substrate drilling apparatus according to claim 1, wherein if the tip position detected by the drill determined to be reused is within a predetermined range from the tip position detected when the drill was determined to be unused, The board drilling apparatus characterized in that the machining depth of the blind hole is determined based on the tip position of the former. It is possible to determine whether the drill used for processing is unused or reused, insert the drill attached to the spindle into a drill inspector to inspect the position of the tip of the drill, and detect blind holes based on the position of the tip. In a board drilling method for determining the machining depth, for a drill determined to be reused, the machining depth of the blind hole is determined based on the tip position detected when the drill is determined to be unused. A substrate drilling method characterized by: 4. In the substrate drilling method according to claim 3, if the tip position detected by the drill determined to be reused is within a predetermined range with respect to the tip position detected when the drill was determined to be unused, A method of drilling a substrate, wherein the machining depth of a blind hole is determined based on the tip position of the former.

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