CN102922377A - Method for automatically grinding micro drill blade - Google Patents

Abstract

The invention provides a method for automatically grinding a micro drill edge, which comprises the steps of driving a rotary table to intermittently rotate and move on an equal circumference path by using a direct drive motor, enabling the rotary table to capture a micro drill bit in a feeding area in sequence, correcting the edge surface of the drill bit in a correction area, grinding the edge surface in a grinding area for one time, and continuously carrying the drill bit to a detection area to detect whether the edge surface is good or defective; when the cutting face is good, the good drill bit is taken out from the rotary table, when the cutting face is defective, the drill bit can be carried to return to the grinding area for secondary grinding, and the detection area is continuously used for secondary detection of the secondarily ground cutting face, so that the automatic process of grinding firstly and then detecting is repeatedly implemented.

Description

Method for Automatically Grinding Micro Drilling Edges

technical field

The invention relates to a special micro-drill bit for drilling printed circuit boards, in particular to a method for automatically grinding and detecting the blade face of the drill bit.

Background technique

It is well known that a micro drill bit is a drilling tool with a blade surface diameter of only about 0.1 to 1.0 mm, and has been widely used in drilling operations for printed circuit boards. As the drill bit is used for many times, its edge surface is prone to wear and the drilling accuracy is lost; in order to prolong the service life of the drill bit edge surface, the current practice is to use a manual grinding machine tool to regrind the edge surface of the worn drill bit , so that the blade surface can be restored to the state of drilling the correct hole diameter accuracy.

At present, most of the methods of grinding the blade surface of micro-drills are manually operated grinding machine tools for grinding the blade surface, including first positioning the drill on a jig, and operating the rotating grinding wheel along the specific angle required by the drill blade. Carry out linear path displacement so as to facilitate the contact grinding of the blade surface on this path, but the drill bit on the jig needs to be manually removed and replaced, so there is a problem of inefficiency.

The blade surface grinding technology of comparatively advanced micro-drills has been disclosed to use a turntable that can rotate back and forth between an inlet/discharge area station and a grinding area station. The turntable is transferred to the grinding area station for grinding of the blade surface, and then the turntable returns to the feeding/discharging area station to unload the fine drill bits that have been ground on the turntable. However, the turntable cannot perform a 360-degree rotation of the same circle. The reason is that the power cord and air tube that must be arranged on the turntable will cause obstruction due to excessive rotation, making it difficult to configure a detection area on the turntable to detect that the ground has been properly ground. blade surface.

And know, on the blade face detection technology of micro-drill, there is the pioneer of automatic detection, such as Chen, China Taiwan Announcement No. I295727 patent case, promptly discloses a kind of device of laser detection blade face of micro-drill, and it utilizes one can etc. The turntable rotates intermittently in the circle, and the calibration, detection, and identification stations of the drill are set around the turntable, and the micro drill is transferred through the turntable to pass through each processing station one by one, so as to accept the instruments in each processing station for calibration. , detection, discrimination and other operations. However, this case did not disclose the automatic process technology for grinding the edge face of the drill bit, and the accuracy of intermittent positioning after the turntable rotates is not easy to grasp, especially when the turntable is used to carry the micro drill bit to move station by station, and the diameter is only about 0.1 to 100mm. The position of the blade surface of 1.0 mm is positioned at the point to be ground in the grinding processing area, and the positioning accuracy of the turntable is difficult to control.

It is supplemented that when the above-mentioned turntable carries the micro-drill to the detection zone station to detect the blade surface, the reason why the blade surface is accurately located at the measured position is based on the three-dimensional image vision device (CCD) configured in the detection zone station. The ability to shift and capture images can even allow slight differences in the measured position of the blade surface, and automatically shift and capture the blade surface image to judge the detection result. On the other hand, it is difficult for the grinding tool equipment loaded with the grinding wheel to imitate the three-dimensional alignment micro-displacement of the image vision device, and to obtain the precise alignment of the grinding point between the position of the blade surface with a diameter of only about 0.1 to 1.0 mm.

Contents of the invention

The invention aims at improving the grinding efficiency of the blade face of the micro-drill, and further provides a method which can automatically carry the micro-drill, and perform grinding first and then detection of the blade face.

The technical means of the present invention include:

Provide a direct drive motor (Direct Drive Motor, DDM) to drive a turntable to rotate intermittently on a path of equal circumference. The intermittent rotation includes:

Positioning the turntable in a feeding area to retrieve a micro drill;

Rotate the drill bit to a calibration zone for detection and calibration of the blade face of the tiny drill bit;

Rotate the drill bit to a grinding area for positioning, and grind the blade face at a time;

Rotate the drill bit to a detection area for positioning, and detect whether the blade surface is a good product or a defective product at one time; wherein:

When the blade surface is a good product, pick up the drill bit on the turntable from the detection area, and rotate the turntable to return to the feeding area for positioning; and

When the blade surface is a defective product, rotate the drill bit to return to the grinding area for positioning, grind the blade surface for the second time, then rotate the drill bit and return to the detection area for positioning, and secondly detect that the blade surface is the good product or defective products.

In implementation:

The direct drive motor directly drives the turntable.

The feeding area is adjacent to the calibration area and the detection area; the calibration area is adjacent to the feeding area and the grinding area; the grinding area is adjacent to the calibration area and the detection area.

The turntable uses a drill clamp to pick up the micro-drill; in the calibration zone, the drill clamp can drive the micro-drill to rotate slightly to calibrate the blade surface.

The blade surface includes a first blade surface and a second blade surface. The calibration area uses a horizontal image vision device to detect the angle of the blade surface, and uses a vertical image vision device to detect a relative angle of the blade surface. distance.

The turntable further includes using a seat to protect an end of the micro-drill, the end is adjacent to the edge face, and the seat and the drill clamp are positioned on a normal position of the turntable opposite to each other.

The grinding zone grinds the blade face using a linearly displaced grinding wheel.

The detection area uses a horizontal image vision device to detect whether the edge angle is a good product or a defective product.

Based on above-mentioned technical means, effect of the present invention is:

1. Utilize the direct drive motor to have the ability to drive the turntable to rotate in a circular path, and can accurately brake and position intermittently at a specific angle, so as to improve the rotary displacement and brake positioning of the turntable carrying the fine drill bit. The positioning accuracy of the cutting point.

2. The direct drive motor has the ability to drive the turntable to reverse positioning, so that when the ground drill bit edge is detected to be poorly ground in the detection area and needs to be ground again, the turntable can reverse from the detection area and return to the grinding area for positioning, so as to realize the advanced Inspection after grinding, and can return to the automatic process of re-grinding after inspection.

3. The drill clamp and the seat are positioned at a normal position of the turntable, and used as a jig for precisely positioning the cutting edge of the drill bit on the turntable, so as to stabilize the cutting edge and withstand the grinding action when being ground The application of force to improve the yield of automatic grinding blade surface.

In order to fully understand the above-mentioned technical means and their effectiveness of the present invention, and implement the present invention accordingly, please refer to the content of the implementation mode and describe as follows in conjunction with the accompanying drawings:

Description of drawings

Fig. 1 is the disposition diagram of each district station of the present invention;

Fig. 2 a and Fig. 2 b respectively disclose the schematic diagram of the micro-drill of the present invention and its edge face;

Fig. 3 is a front view configuration sectional view of the direct drive motor and the turntable of the present invention;

Fig. 4 is a top sectional view of Fig. 3;

Fig. 5 is the block diagram of the implementation process of each district station in Fig. 1;

Figure 6 is a schematic diagram of a cutaway illustration of the feed zone shown in Figure 1;

Fig. 7 is an explanatory schematic diagram of the school location area shown in Fig. 1;

Figure 8 is an explanatory top view of the grinding zone shown in Figure 1; and

FIG. 9 is a schematic illustration of the detection zone shown in FIG. 1 .

Explanation of reference numerals: direct drive motor 1; drive column 10; turntable 2; micro drill 3; blade surface 30; first blade surface 31; second blade surface 32; blade center line 33; reference line 34; end 35; Good product 36; defective product 37; feeding area 4; feeding jaw 41; drill clamp 42; jaw 43; Fixture box 50,70; Horizontal image visual device 51; Vertical image visual device 52; Grinding area 6; Grinding tool machine 61; Grinding wheel 62,63; Detection area 7; ; Offset angle θ; relative distance h.

Detailed ways

Please refer to Figures 1 to 9 in combination. Among them, Fig. 1 discloses a schematic diagram of the configuration of each zone station of the present invention; Fig. 2a and Fig. 2b respectively disclose a schematic diagram of a micro drill bit and its blade face of the present invention; Fig. 3 discloses a front view configuration sectional view between the direct drive motor and the turntable of the present invention ; Fig. 4 reveals the top view sectional view of Fig. 3; Fig. 5 reveals the block diagram of the implementation process of each district station in Fig. 1; Fig. 6 is the explanatory diagram of the feeding area shown in Fig. 1; Fig. 7 is the alignment shown in Fig. 1 Fig. 8 is an explanatory view of the grinding area shown in Fig. 1; Fig. 9 is an explanatory view of the detection area shown in Fig. 1, and the accompanying drawings illustrate a method for automatically grinding a micro-drilling edge provided by the present invention, including :

A direct drive motor 1 (Direct Drive Motor, DDM) is provided to drive a turntable 2 to rotate intermittently on a path of equal circles. in:

The direct drive motor 1 (Direct Drive Motor, DDM) provided by the present invention is equipped with an encoder, which can generate 4,096,000 pulses (pulses) per revolution, and within a specific circumference range, it can rotate The positioning accuracy can reach 0.1μm/degree. Therefore, for the blade face 30 with a diameter of only about 0.1 to 1.0 mm on the micro drill bit 3 (as shown in FIGS. In the position to be ground and to be inspected.

The intermittent rotation referred to in the present invention essentially includes the use of the direct drive motor 1 to directly drive the turntable 2 to produce intermittent motions of precise positioning and rotational displacement between certain specific angles on the equicircumferential path; The embodiment in which the drive motor 1 directly drives the turntable 2 may be that the turntable 2 is directly locked on the ring-shaped drive column 10 of the direct drive motor 1 (as shown in FIGS. 3 and 4 ), so that the turntable 2 is directly driven by the direct drive motor. The drive motor 1 is driven to generate intermittent rotation; the several specific angles substantially include a feeding area 4, a calibration area 5, a grinding area 6 and a detection area 7 ( As shown in Figure 1); the feeding area 4 is adjacent between the calibration area 5 and the detection area 7, and the calibration area 5 is adjacent between the feeding area 4 and the grinding 6 area, and the grinding area 6 It is adjacent to between the calibration area 5 and the detection area 7 . More specifically, the present invention includes the following steps (as shown in Figure 5):

Step S1: Position the turntable 2 in the feeding area 4 (as shown in FIG. 1 ) by means of the direct drive motor 1 to pick up a micro drill 3 . In practice, the feeding area 4 is provided with an automatic feeding jaw 41 (as shown in FIG. 6 ), and the feeding jaw 41 can pick up a The drill bit 3 is moved to the turntable 2 to insert the drill bit 3 at a specific position. The specific position is actually a drill clamp 42 positioned on the turntable 2. One end of the drill clamp 42 has a jaw 43 that is driven by air pressure to expand and tighten. The jaw 43 is used to precisely Capture and clamp the drill bit 3 for positioning. The other end of the drill clamp 42 has a spindle for connecting with a shaft coupler 44 and a stepper motor 45 through the shaft coupler 44 . This specific position also includes a seat 46 in essence, and the seat 46 and the drill clamp 42 are substantially opposite and positioned at a normal position 47 (as shown in FIG. 4 ) or a radial position on the surface of the turntable 2. On a straight line, the seat 46 supports an end 35 of the drill bit 3 (as shown in FIG. 3 ), and the end 35 is adjacent to the edge face 30 .

Step S2: Drive the turntable 2 to rotate by means of the direct drive motor 1 to carry the drill bit 3 away from the feeding area 4, and then rotate the drill bit 3 to a calibration area 5 and then position it (as shown in Figure 1), so that the drill bit 3 The blade surface 30 at the top is used for detection and calibration. In practice, since the blade surface 30 includes a first blade surface 31 and a second blade surface 32 (as shown in FIG. Device 52. in:

The horizontal image visual device 51 can take images of the first and second blade faces 31, 32 (shown in FIG. 2 b ) of the drill bit, and then detect the deviation angle θ of a blade center line 33 on the blade face. The offset angle θ is the angular offset between the blade center line 33 and a predetermined reference line 34 .

The vertical image visual device 52 can take an image of the blade length of the drill bit 3, and then detect a relative distance h of the blade surface 30 (as shown in FIG. 7). The distance between the predetermined reference points, the predetermined reference point may be the position of the jaw 43 or a specific position within the visual range of the vertical image vision device.

After using the vertical and horizontal image vision devices 51 and 52 to detect and read the offset angle θ of the center line 33 on the blade surface 30 and the relative distance h between the blade surface 30, the stepping motor 45 is used to drive the clamping drill The tool 42 drives the drill bit 3 positioned at the jaw 43 and held between the sockets 46 to produce a slight rotation at a specific angle to compensate for the offset angle θ, so that the edge center line 33 can be adjusted to the reference line 34 position, the angle of the blade surface 30 is corrected, and the actual position of the blade surface 30 is obtained by reading the relative distance h.

Step S3: relying on the direct drive motor 1 to drive the turntable 2 to rotate and carry the drill bit 3 away from the calibration area 5, so that the drill bit 3 is rotated to a grinding area 6 for positioning (as shown in Figure 1), and the first and second The two blade surfaces 31, 32 (shown in FIG. 2 b ) are ground once. In practice, a grinding machine tool 61 with linear displacement capability (as shown in FIG. 8 ) is arranged in the grinding area 5, and two grinding wheels 62, 63 are arranged on the machine tool, and the two grinding wheels 62, 63 have been adjusted respectively in advance. Correct the predetermined grinding angles of the first and second blade surfaces 31 and 32 to be obtained, and the two grinding wheels 62 and 63 have the power of self-rotation and synchronous linear displacement. Thus, two grinding wheels 62, 63 are used to perform linear displacement grinding on the first and second blade surfaces 31, 32 that have been positioned in the grinding area 6 and have been calibrated to complete the first and second blade surfaces. Primary grinding of faces 31,32.

Step S4: Drive the turntable 2 to rotate by means of the direct drive motor 1 to carry the drill bit 3 away from the grinding area 6, so that the drill bit 3 is rotated to a detection area 7 for positioning (as shown in FIG. 1), and the blade surface 30 is detected once. A good product 36 or a defective product 37 . In practice, a horizontal image vision device 71 is arranged in the detection area 7 to take images of the first and second blade surfaces 31, 32 (as shown in FIG. , so as to compare with the standard images of the first and second blade surfaces to be obtained, and detect whether there is an accuracy range exceeding the allowable error, and determine the first and second blade surfaces 31, 32 after one grinding It is a good product 36 within the accuracy range or a defective product 37 beyond the accuracy range. in:

The detection area 7 further includes an automatic discharge jaw 72. When the first and second blade surfaces 31, 32 are judged to be good products 36, the discharge jaw 72 can pick up the good product 36 from the detection area 7. The drill bit 3 is moved to a good product jig box 70 and the drill bit 3 of the good product 36 is inserted, and then the direct drive motor 1 drives the turntable 2 to rotate and returns to the feeding area 4 for positioning, so as to repeat the above step S1 .

When the first and second blade surfaces 31, 32 are determined to be defective products 37, the discharge jaw 72 does not move, and the direct drive motor 1 drives the turntable 2 to rotate in reverse to carry the defective products 37. The drill bit 3 is returned to the grinding area 6 for positioning, and step S3 is repeated, so as to perform secondary grinding on the first and second edge surfaces of the defective drill bit 3 . After the secondary grinding is completed, the direct drive motor 1 drives the turntable 2 to rotate to the detection area 5 again, so that the drill bit 3 after the secondary grinding can return to the detection area 5 for positioning again, and step S4 is repeatedly executed. The first and second blade surfaces 31 and 32 are detected to be the good product 36 or the defective product 37 for the second time.

Repeating the above steps S1 to S4 can realize the automatic process of grinding first and then testing according to the present invention, and has the following advantages:

1. The use of direct-drive motors to drive turntables has novel combination features and the progressive benefits of precise automatic positioning for specific purposes where the equicircumferential path produces intermittent rotation.

2. The direct drive motor has the ability to drive the turntable to reverse the positioning, so as to realize the automatic process of grinding first, then testing, and returning to grinding after testing.

3. The drill clamp and the seat are positioned on a normal position of the turntable, and used as a jig for precisely positioning the cutting edge of the drill bit on the turntable, which can make the cutting edge stable when subjected to the grinding force .

The above examples only express several implementation modes of the present invention, but should not be understood as limiting the patent scope of the present invention. It should be noted that, for those skilled in the art to which the present invention belongs, multiple modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the present invention should be based on the content of the claims defined in the patent scope of the application.

Claims (10)

1. A method for automatically grinding micro-drilling edges, characterized in that, comprising: A direct drive motor is provided to drive a turntable to rotate intermittently on a path of equal circles. The intermittent rotation includes in sequence: Positioning the turntable in a feeding area to retrieve a micro drill; Rotate the drill bit to a calibration zone for detection and calibration of the blade face of the tiny drill bit; Rotate the drill bit to a grinding area for positioning, and grind the blade face at a time; Rotate the drill bit to a detection area for positioning, and detect whether the blade surface is a good product or a defective product at one time; wherein: When the blade surface is a good product, pick up the drill bit on the turntable from the detection area, and rotate the turntable to return to the feeding area for positioning; and When the blade surface is a defective product, rotate the drill bit to return to the grinding area for positioning, grind the blade surface for the second time, then rotate the drill bit and return to the detection area for positioning, and secondly detect that the blade surface is the good product or defective products. 2. The method for automatically grinding micro-drilling edges according to claim 1, wherein the direct drive motor directly drives the turntable. 3. The method for automatically grinding micro-drilling edges according to claim 1, wherein the feeding area is adjacent to between the calibration area and the detection area. 4. The method for automatically grinding micro-drilling edges according to claim 1, wherein the calibration zone is adjacent to the feeding zone and the grinding zone. 5. The method for automatically grinding micro-drilling edges according to claim 1, wherein the grinding area is adjacent to the calibration area and the detection area. 6 . The method for automatically grinding a micro-drill as claimed in claim 1 , wherein the turntable uses a drill clamp to capture the micro-drill. 7 . 7. The method for automatically grinding a micro-drill edge according to claim 6, characterized in that, in the calibration zone, the drill clamp can drive the micro-drill to rotate slightly to calibrate the blade surface. 8. The method for automatically grinding a micro-drilling edge according to claim 1 or 7, wherein the blade surface includes a first blade surface and a second blade surface, and the calibration area uses a horizontal image visual device to detect The angle of the blade face is known, and a relative distance of the blade face is detected using a vertical image vision device. 9. The method for automatically grinding a micro-drill as claimed in claim 6, wherein the turntable further comprises using a seat to hold an end of the micro-drill, the end is adjacent to the blade face, and the seat and The drill clamps are located opposite to each other on a normal line position of the turntable. 10 . The method for automatically grinding a micro-drilling edge according to claim 1 , wherein the grinding zone uses a linearly displaced grinding wheel to grind the edge face. 11 .

Images