TWI813890B - Substrate drilling device and substrate drilling method - Google Patents

Abstract

[Problem] The object of the present invention is to ensure depth accuracy even when using a reused drill bit with cutting powder or dirt attached to the tip. [Solution] A substrate drilling device, characterized in that it is equipped with: an identification means for identifying whether a drill bit used for processing has not been used or has been used again; and a drill bit checker for inserting the drill bit installed on the spindle to inspect the drill bit. The front end position of the drill bit; the substrate drilling device determines the processing depth of the blind hole based on the front end position detected by the drill bit checker; for the drill bit determined to be reused by the identification means, based on the The processing depth of the blind hole is determined by the detected front end position when the drill bit is judged to have not been used.

Description

Substrate drilling device and substrate drilling method

The present invention relates to a substrate drilling device and a substrate drilling method, which operate, for example, by checking the status of a drill bit before drilling holes in a printed circuit board.

In the drill bit checker as mentioned above, the tool diameter or the position of the cutting edge (front end) of the drill bit will be detected, and an error message will be displayed if there is an abnormality. For example, when controlling the machining depth when machining a blind hole, the position of the blade (front end) is a necessary condition in order to know where the blade is positioned relative to the vertical feed position of the spindle that holds the drill bit. Patent Document 1 discloses a substrate drilling device equipped with the above-mentioned drill bit checker. [Known technical documents] [Patent Document]

[Patent Document 1] Japanese Patent Application Publication No. 2016-120563

[Problem to be solved by the invention] In the substrate drilling device, not only new drill bits that have not been used, but also drill bits that are still used for the next processing after the previous processing (hereinafter, they are called reused drills according to the needs of the explanation) are also recovered from the spindle and stored in the drill bit. Cassette. In the conventional substrate drilling device, the drill bit is inspected by a drill bit checker every time before processing. However, when the drill bit is used again, there will be cutting powder or dirt attached to the blade edge (front end) and the drill bit cannot be drilled correctly. to detect the condition of the blade. Therefore, in the case of blind hole processing where the processing depth must be accurately controlled, there is a disadvantage that depth accuracy cannot be ensured. Patent Document 1 does not discuss the problem of using a reused drill bit with cutting powder or dirt attached to the tip.

Therefore, an object of the present invention is to ensure depth accuracy even when a reused drill bit with cutting powder or dirt attached to the tip is used.

[Technical means to solve the problem] Among the inventions disclosed in this application, a representative substrate drilling device is characterized by having: a means for identifying whether a drill bit used for processing has not been used or has been used again; and a drill bit checker installed on the The drill bit of the spindle is inserted to check the front end position of the drill bit; the substrate drilling device determines the processing depth of the blind hole based on the front end position detected by the drill bit checker; for the identification means For a drill bit determined to be reused, the processing depth of the blind hole is determined based on the front end position detected when the drill bit was determined to have not been used.

Furthermore, among the inventions disclosed in this application, a typical substrate drilling method is characterized by being able to identify whether the drill bit used for processing has not been used or is being used again, and inserting the drill bit installed on the spindle. The drill bit checker checks the front end position of the drill bit, and determines the processing depth of the blind hole based on the front end position; for a drill bit determined to be reused, based on the front end position detected when the drill bit is determined to have not been used. To determine the processing depth of blind holes.

[Invention effect] According to the present invention, depth accuracy can be ensured even when a reused drill bit with cutting powder or dirt attached to the tip is used.

(Example) Hereinafter, an embodiment of the present invention will be described. FIG. 2 is a schematic structural diagram of a substrate drilling device according to an embodiment of the present invention. In FIG. 2 , reference numeral 1 is a device base serving as the base of the device, and reference numeral 2 is a processing table driven in the X direction on the device base by a drive mechanism not shown. Here, two printed circuit boards 3 to be processed are placed on the processing table 2. However, a plurality of printed circuit boards 3 are actually placed on the processing table 2. Component symbol 4 is a door-shaped column installed on the device base 1, which is arranged across the processing table 2, and a vertical surface of the door-shaped column 4 is equipped with a driving mechanism not shown in the figure. Transverse sliding table 5 driven in Y direction.

Here, the transverse sliding table 5 is equipped with a spindle 6, which corresponds to each printed circuit board 3 placed on the processing table 2. The spindle 6 is 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 driving mechanism (not shown). Reference numeral 7 is a drill bit held on the spindle 6 and used to process the printed circuit board 3 . Component symbol 8 is a sub-chuck installed on the main shaft 6 and moving in the Z direction together with the main shaft 6 . Component symbols 9 and 10 are respectively a supply clamping post and an exit tool clamping post provided on the processing table 2 , and component symbol 11 is a drill cassette for sorting and storing new drill bits and old drill bits, which is provided on the processing table 2 superior.

Reference numeral 12 is a drill bit checker that has a function of detecting the tool diameter or blade edge position of the drill bit 7 held by the spindle 6, and operates by inserting the drill bit 7 from above. The supply clamping column 9 , the withdrawal clamping column 10 , the drill cassette 11 and the drill bit checker 12 are respectively arranged in the vicinity of the printed circuit board 3 to be processed corresponding to the spindle 6 . Component symbol 16 is a display unit that serves to convey various information to the operator. Reference numeral 17 is an overall control unit that controls each part of the device, and is implemented, for example, by a program-controlled processing device. As mentioned above, the structure in which a plurality of spindles 6 are assembled on the portal cylinder 4 and the tool clamping column and the like are arranged corresponding to the spindles 6 is used to increase the amount of processing at a time, and is a common multi-axis substrate drilling device. well known.

FIG. 3 is a diagram illustrating the schematic structure of the drill bit checker 12 . In Fig. 3, only the parts related to the present invention are shown. In FIG. 3 , component symbol 21 is a hole into which the drill bit 7 held by the spindle 6 is inserted, component symbol 22 is a light emitting device provided in the middle of the hole and emits light in the lateral direction, and component symbol 23 is a light emitting device that receives light from the light emitter 22 light sensor. In this drill bit inspector 12 , the light sensor 23 is used to detect when the drill bit 7 is inserted into the hole 21 and the light from the light emitter 22 is blocked by the blade of the drill bit 7 .

The substrate drilling device in FIG. 2 operates as follows under the control of the overall control unit 17. Here, the detection operation of the cutting edge position of the drill bit 7 using the drill bit checker 12 will be described using the flowchart of FIG. 1 . Incidentally, the overall control unit 17 grasps the time when the drill bit 7 is used in the processing operation, and for each drill bit 7 stored in the drill bit cassette 11, the following information is stored in the memory unit 18: indicating which drill bit it is. 7 drill bit identification information d, and the remaining time Tr which is the life time Tm (never used once) minus the actual time used in processing. That is, as shown in Fig. 4(a) , the remaining time Tr1, Tr2, Tr3... is stored corresponding to the drill bit identification information d1, d2, d3....

When the machining action is commanded, the designated drill bit 7 is first moved from the drill bit cassette 11 to the supply clamping tool column 9 through the sub-chuck 8 (step 1), and then the drill bit 7 is installed behind the spindle 6 Align the upper position of the drill bit checker 12 (step 2). Next, it is determined whether the remaining time Tr of the drill bit 7 is equal to the life time Tm (step 3). If the remaining time Tr is equal to the life time Tm, that is, the drill bit has not been used once, the drill bit 7 is lowered until the light sensor 23 Until no light is detected (steps 4 and 5), when no light is detected by the light sensor 23, the descent of the drill 7 is stopped (step 6), and then the blade edge is calculated based on the vertical feed amount of the spindle 6 at this time. The position is stored as the blade detection position P together with the drill bit identification information in the memory unit 18 (step 7). On the contrary, if the remaining time Tr is shorter than the life time Tm in step 3, that is, the drill bit is used again after being used once, the detection action of the blade position is omitted, and other inspections using the drill bit checker 12 are performed (step 3). 8).

Since the above operations are performed every time a machining operation command is issued, the drill identification information d and the blade detection position P are stored in the memory unit 18 for each drill 7 used for the first time. That is, as shown in FIG. 4(b) , the blade detection positions P15, P6, P11... are stored in the drill bit identification information d15, d6, d11... corresponding to the drill bit 7 used for the first time.

Next, in the inspection performed in step 8, if no abnormality is detected, the processing operation is started. However, if an abnormality is detected, the processing operation is not started, and an abnormality message is notified to the operator through the display unit 16. During the machining operation, the blade detection position P corresponding to the drill bit 7 installed on the spindle 6 is read from the memory unit 18, and when performing blind hole machining, the vertical feed of the spindle 6 is carried out to where it is to be processed. The depth is determined based on the blade edge detection position P. Incidentally, as disclosed in Japanese Patent Application Laid-Open No. 2003-1509 (paragraph 0004), when the feed speed of the spindle 6 is switched before and after the drill bit 7 contacts the printed circuit board 3, it can also be based on The blade detection position P determines the time point of this switching.

On the other hand, when the drill bit 7 is used again, there is a possibility that cutting powder or dirt adheres to the front end and the blade edge detection position cannot be accurately detected by the drill bit checker 12 . However, according to the above embodiment, when the drill 7 is used again, the detection operation of the blade edge position is not performed, but the processing depth is determined based on the blade edge detection position P detected when the drill 7 is used for the first time, so blindness can be ensured. Depth accuracy of hole machining.

As mentioned above, the present invention has been specifically described based on the embodiments. However, the present invention is not limited to the above-described embodiments. It goes without saying that various changes can be made within the scope that does not deviate from the above-described gist, and various modifications are included. Examples of changes. For example, in the above embodiment, if the drill bit is used again, the detection action of the blade position is omitted, but it can also be done in the following manner: no matter whether the drill bit is new or old, the detection action of the blade position is performed every time, and based on the first use The processing depth is determined by the detected blade detection position. This approach can simplify the routine processing actions of the drill bit checker. In addition, the method described below can also be used: regardless of whether the drill bit is new or old, the blade position detection action is performed every time, and the blade detection position detected when used for the first time is compared with the blade detection position when used again. If there is a difference between the two If it falls within the predetermined range, the difference is considered to be not caused by the influence of cutting powder or dirt, and the processing depth is determined based on the detection position of the blade when it is used again.

1:Device base 2: Processing table 3: Printed substrate 4: Portal column 5: Horizontal sliding platform 6: Spindle 7:Drill bit 8: Vice chuck 9: Supply clamping tool post 10: Exit the tool clamping column 11:Drill bit cassette 12:Drill bit checker 16:Display part 17:Overall Control Department 18:Memory Department 21:hole 22:Lightener 23:Light sensor

FIG. 1 is a flow chart illustrating the detection operation of the cutting edge position of the drill bit in one embodiment of the present invention. FIG. 2 is a schematic structural diagram of a substrate drilling device according to an embodiment of the present invention. FIG. 3 is a diagram for explaining the structure of the drill bit checker in FIG. 2 . FIG. 4 is a diagram showing the memory state of the memory unit in FIG. 2 .

Claims (4)

A substrate hole opening device, characterized by having: Identification means to identify whether the drill bit used for processing has not been used or has been used again; and A drill bit checker that inserts the drill bit installed on the spindle to check the front end position of the drill bit; The substrate drilling device determines the processing depth of the blind hole based on the front end position detected by the drill bit checker; For a drill bit determined to be reused by the discrimination means, the processing depth of the blind hole is determined based on the front end position detected when the drill bit is determined to have not been used. The substrate drilling device according to claim 1, wherein, If the front end position detected with the drill bit determined to be used again falls within a predetermined range with respect to the front end position detected when the drill bit is determined to have not been used, then based on the former front end position Determine the processing depth of blind holes. A method for opening holes in a substrate, characterized by: It can identify whether the drill bit used for processing has not been used or is used again, and insert the drill bit installed on the spindle into the drill bit checker to check the front end position of the drill bit, and determine the processing depth of the blind hole based on the front end position; For a drill bit determined to be used again, the processing depth of the blind hole is determined based on the front end position detected when the drill bit is determined to have not been used. The substrate drilling method as described in claim 3, wherein, If the front end position detected with the drill bit determined to be used again falls within a predetermined range with respect to the front end position detected when the drill bit is determined to have not been used, then based on the former front end position Determine the processing depth of blind holes.