CN112276688A

CN112276688A - Drill point grinding device and method

Info

Publication number: CN112276688A
Application number: CN201910662431.7A
Authority: CN
Inventors: 许文铭
Original assignee: Multitech Co ltd
Current assignee: Multitech Co ltd
Priority date: 2019-07-22
Filing date: 2019-07-22
Publication date: 2021-01-29

Abstract

The invention relates to a drill point grinding device and a method, wherein the grinding device comprises a grinding wheel; the collet assembly is provided with a collet used for clamping a drill bit, wherein the drill bit is provided with a drill body, and the drill body is provided with a first side and a second side opposite to the first side; and a protective cylinder assembly including a drill seat, a protective cover and a cylinder, wherein the first side of the drill body is disposed on the drill seat, the protective cover has a propping plane, and the cylinder pushes the protective cover to make the propping plane press the second side of the drill body, so that the drill body is fixed between the propping plane and the drill seat for grinding the grinding wheel.

Description

Drill point grinding device and method

Technical Field

The present invention relates to a drill point grinding device and method, and more particularly, to a drill point grinding device and method using a cylinder to push a protection cover so that a propping plane tightly presses a drill body.

Background

When the drill point (or micro-drill point) drills 0.25-0.75 mm holes on many printed circuit boards, the drill point becomes dull, and the drill point needs to be ground again by using the grinding wheel to restore the sharpness of the drill point. Referring to fig. 1, a drill point 10 is shown having a shank 11 (0.25 mm diameter) and a shank 12.

Conventionally, when grinding the drill body 11, the position of the holding distance from the most front end of the drill body 11 is usually about 1 to 1.5 times (i.e. 0.25mm to 0.375mm) of the diameter of the drill body 11, so that the arm is too long, so that when the grinder is grinding the drill body 11, the bit force is generated at the moment of contacting the most front end of the drill body 11, the dislocation (i.e. the position change) of the drill body 11 is generated, and when the drill body 11 is dislocated, the edge face completed by the drill point 10 is inaccurate, which easily results in a low grinding yield, for example, after grinding 500 drill points, the grinding yield is usually less than 50%, sometimes only 100 to 200 drill points are qualified, and for an unqualified drill point, the grinding needs to be performed again, which also causes a low grinding efficiency, and is a problem to be solved.

Therefore, the present invention is conceived in view of the shortcomings in the prior art, through careful experiments and studies, and with the spirit of the present invention being clear, the following is a brief description of the present invention.

Disclosure of Invention

After the inventor has made experiments, tests and researches, a drill point grinding device and a method thereof are finally obtained, which not only effectively avoid the problem of dislocation of the drill body during grinding, but also have the effect of greatly improving the yield of drill point grinding. The problem to be solved by the present invention is how to overcome the problem of the dislocation of the grinding drill bit, so as to make the grinding of the edge surface of the drill bit more accurate, how to overcome the problem that the arm of force of the protective cover becomes smaller and then the drill bit needs to be pressed tightly by sufficient force, and how to overcome the problem that the drill bit needs to be prevented from being crushed before the cylinder finishes the whole pushing stroke.

The invention discloses a drill point grinding device, which comprises a grinding wheel, a collet assembly and a protective cylinder assembly, wherein the collet assembly is provided with a collet used for clamping a drill point, the drill point is provided with a drill body, the drill body is provided with a first side and a second side opposite to the first side, the protective cylinder assembly comprises a drill point seat, the first side of the drill body is arranged on the drill point seat, a protective cover is provided with a propping plane, and the cylinder pushes the protective cover to enable the propping plane to press the second side of the drill body, so that the drill body is fixed between the propping plane and the drill point seat, and the grinding wheel can be ground.

According to another practical aspect, the present invention further discloses a drill point grinding method using the above drill point grinding apparatus, including placing the drill point on the drill point seat, the cylinder pushing the slide seat to rotate the protection cover to press the drill body of the drill point, so that the protection cover and the drill point seat fix the drill body for grinding the drill point, and after the drill point is ground, the cylinder pulling back the slide seat to rotate the protection cover to release the drill body of the drill point, so that the ground drill point is removed from the drill point seat.

The protection cylinder assembly for fixing the drill bit is also used for matching with a collet for clamping the drill bit so as to be beneficial to processing the drill bit, and comprises a drill bit seat, a drill bit body accommodating part for the drill bit, a fixed seat, a protection cover, a propping part and a cylinder, wherein the protection cover is pivotally arranged on the fixed seat and is matched with the drill bit body accommodating part for fixing the drill bit, and the cylinder is used for driving the protection cover so as to determine the relative position of the protection cover and the drill bit seat so as to be beneficial to grinding the drill bit by a grinding wheel.

Drawings

FIG. 1: is a three-dimensional schematic view of a drill point which becomes blunt after being used for many times;

FIG. 2: the perspective view of the drill point polishing device of the preferred embodiment of the present invention;

FIG. 3: is a front view of the drill tip seat of FIG. 2 with the protective cap pressing the drill body;

FIG. 4: is a perspective view of the protective cover in FIG. 2;

FIG. 5: is a perspective view of the protection cover, the movable shaft and the fixed shaft in FIG. 2;

FIG. 6: is a three-dimensional schematic view of the base of the driving portion of the protection cover in FIG. 2;

FIG. 7: is a schematic perspective view of the carriage in the base of fig. 6;

FIG. 8: is a further perspective view of the carriage of figure 7;

FIG. 9: is a schematic perspective view of the cover plate of the driving portion of the protection cover in FIG. 2;

FIG. 10: is a schematic perspective view of a fixing base for mounting the base in FIG. 6;

FIG. 11: is a perspective view of the cylinder of fig. 2;

FIG. 12: is a perspective view of a first nut for pushing the slider of figure 7;

FIG. 13: is a perspective view of the second nut pulling back the carriage of figure 7;

FIG. 14: is a schematic side view of the slide in FIG. 7 pushing the protective cap to press the drill body;

FIG. 15: is a schematic side perspective view of the slide of figure 7 rotating the protective cover to release the drill body;

FIG. 16: is a schematic cross-sectional view of the cylinder urging spring in fig. 11;

FIG. 17: is a perspective view of the drill holder in fig. 2;

FIG. 18: is a perspective view of the slide rail required to remove the drill point of FIG. 2;

FIG. 19: is a perspective view of a standard slider that mates with the slide rail of fig. 18;

FIG. 20A: is a perspective view of a turntable for mounting the standard slider of FIG. 19;

FIG. 20B: is a perspective view of the rotary base for mounting the rotary disc in FIG. 20A;

FIG. 21: is a perspective view of the fixing main plate for installing the fixing base in FIG. 10;

FIG. 22: is a three-dimensional schematic view of the protection cylinder assembly of the invention; and

FIG. 23: is another perspective view of the protection cylinder assembly of the present invention.

Detailed Description

In order to ensure that the drill bit can not generate any dislocation when grinding, the invention provides a drill bit grinding device comprising a collet assembly and a protection cylinder assembly and a grinding method thereof, which can ensure that the drill bit in the collet is tightly pressed by a protection cover when being ground so as to protect the drill bit from dislocation when grinding is carried out, and the clamped drill bit is released after being ground. That is, the protective cover and the drill base are tightly matched with each other during grinding of the drill bit of the invention, so that the drill bit during grinding is not subjected to dislocation.

Referring to fig. 2 to 21, a drill grinding apparatus 50 of the present invention is shown, which includes a grinding wheel (not shown), a collet assembly 51 having a collet 52 for holding the drill 10, wherein the drill 10 has a drill body 11, the drill body 11 has a first side 61 as shown in fig. 3 and a second side 62 opposite to the first side 61, and a protection cylinder assembly 53 having a drill base 54, the first side 61 of the drill body 11 is disposed on the drill base 54, a protection cover 55 having a propping plane 70 as shown in fig. 4, and an air cylinder 56, wherein the air cylinder 56 pushes the protection cover 55 to make the propping plane 70 tightly press the second side 62 of the drill body 11, so that the drill body 11 is fixed between the propping plane 70 and the drill base 54 for grinding by the grinding wheel.

In the foregoing embodiment, the protection cylinder assembly 53 of the drill point polishing apparatus 50 may further include a movable shaft 81, a fixed shaft 82 and a protection cover driving portion 57 disposed between the protection cover 55 and the air cylinder 56 as shown in fig. 5, the protection cover 55 further includes two first driving holes 71 and two first shaft holes 721, the protection cover driving portion 57 includes a base 91 as shown in fig. 6, having a second shaft hole 92 and a sliding slot 93, wherein the first shaft hole 721 and the second shaft hole 92 are connected via the fixed shaft 82, so that the protection cover 55 is pivotally connected to the base 91, a sliding seat 101 as shown in fig. 7 is disposed in the sliding slot 93, one end of the sliding seat 101 has the second driving hole 102, and the other end has an air cylinder pushing slot 111 as shown in fig. 8, wherein the first driving hole 71 and the second driving hole 102 are connected via the movable shaft 81, so that the protection cover 55 rotates via the movement of the sliding seat 101, and a cover plate 121 as shown in fig. 9, covering the base 91 and the slide 101.

In the above embodiments, the base 91 of the protection cover driving portion 57 can also be installed on the fixing base 122 as shown in fig. 10, the cylinder 56 has the pushing rod 131 as shown in fig. 11, two

reed switches

21,22 are installed in the two inclined slots 133,134, and the end 132 of the pushing rod 131 is provided with the first nut 141 as shown in fig. 12 to push the sliding seat 101 in the cylinder pushing slot 111, the slot 112 of the cylinder pushing slot 111 is provided with the second nut 152 as shown in fig. 13, so that when the cylinder 56 pulls back the pushing rod 131, the first nut 141 pushes against the second nut 152 to pull back the sliding seat 101.

In the above embodiments, the first driving hole 71 of the protection cover 55 may be an elongated slot 161 as shown in fig. 14, the elongated slot 161 has a slot length GL, when the air cylinder 56 pushes the sliding seat 101, the movable shaft 81 moves to a position about one third of the slot length GL above the elongated slot 161, so that the protection cover 55 presses the drill body 11, when the air cylinder 56 pulls the sliding seat 101 back, the gap length VL between the movable shaft 81 and the upper portion of the elongated slot 161 as shown in fig. 15 is about one fifth of the slot length GL, so that the protection cover 55 releases the drill body 11.

In the above embodiments, the cylinder pushing slot 111 of the protective cover driving portion 57 may also be provided with a spring 181 as shown in fig. 16, so that the cylinder 56 pushes the sliding seat 101 through the spring 181, and the spring 181 is used to buffer the strength of the pushing stroke PS of the cylinder 56 after the protective cover 55 contacts the drill body 11.

In the above embodiments, the drill seat 54 of the protection cylinder assembly 53 may also have a V-shaped groove 191 as shown in fig. 17, and the drill body 11 is disposed in the V-shaped groove 191 to prevent the drill body 11 from shaking during grinding.

The invention also discloses a drill point grinding method using the drill point grinding device 50, which comprises the steps of placing the drill point 10 on the drill point seat 54, pushing the sliding seat 101 by the air cylinder 56, rotating the protective cover 55 to press the drill body 11 of the drill point 10, fixing the drill body 11 by the protective cover 55 and the drill point seat 54 to grind the drill point 10, and after the drill point 10 is ground, pulling the sliding seat 101 back by the air cylinder 56, rotating the protective cover 55 to release the drill body 11 of the drill point 10, so that the ground drill point 10 is removed from the drill point seat 54.

In the foregoing embodiment, the drill point grinding method may further include removing the drill point 10 by using the slide rail 201 shown in fig. 18 and the standard slide block 202 shown in fig. 19, wherein the standard slide block 202 is mounted on the turntable 203 shown in fig. 20A, the turntable 203 is mounted on the rotary base 204 shown in fig. 20B, and the rotary base 204 is located in the upper opening 212 of the fixed main plate 211 shown in fig. 21.

Referring to fig. 22 to 23, the present invention also provides a protection cylinder assembly 53 for fixing a drill point 10, which is used to cooperate with a collet 52 for clamping the drill point 10, so as to facilitate the machining of the drill point 10, the protection cylinder assembly 53 includes a drill point seat 54 having a drill point body accommodating portion 222 (i.e. a V-shaped groove 191) for arranging the drill point 10 on the drill point seat 54, a fixing seat 122, a protection cover 55 pivotally disposed on the fixing seat 122 and having a propping portion 230 (i.e. a propping plane 70) cooperating with the drill point body accommodating portion 222 to fix the drill point 10 therebetween, and an air cylinder 56 for driving the protection cover 55 to determine the relative position of the protection cover 55 and the drill point seat 54, so as to facilitate the grinding of the drill point 10 by a grinding wheel.

In the foregoing embodiment, the protection cylinder assembly 53 may further include a base 91, a fixed main plate 211 and a fixed side plate 221, the base 91 is installed on the fixed base 122, the fixed base 122 is installed on the fixed main plate 211, the fixed main plate 211 is locked on the fixed side plate 221, the pushing of the cylinder 56 causes the protection cover 55 to rotate so that the abutting portion presses the drill body 11 of the drill point 10, the drill body 11 is fixed between the abutting portion and the drill point seat 54, and after the drill point 10 is ground, the pulling back of the cylinder 56 causes the protection cover 55 to rotate so that the abutting portion releases the drill body 11 of the drill point 10. Referring to fig. 23, the protective cap 55 of the protective cylinder assembly 53 is shown covering the drill point seat 54, and the protective cap 55 has the arm 231 of the upper arm.

Since the protection cover 55 is pivotally disposed on the fixing base 122, the moment arm 231 of the upper arm of the present invention is significantly smaller than the conventional moment arm, so that the grinding yield of the drill point 10 can be increased to more than 90%. In an embodiment, for example, a complete pushing stroke PS of the air cylinder 56 is 5mm, a 2mm elastic space ES is usually reserved, when the pushing rod 131 has moved 4mm, the protecting cover 55 has already touched the drill body 11 of 0.25mm, and in order to allow the air cylinder 56 to continue to move the remaining 1mm stroke, the design of the spring 181 is required to avoid the air cylinder 56 pushing the sliding seat 101 directly, and rotating the protecting cover 55 excessively to crush the drill body 11. Of course, if a drill bit with a diameter of 0.75mm is placed on the drill seat 54, the protective cover 55 will hit the thicker drill bit with a diameter of 0.75mm when the pushing rod 131 moves 3.5 mm.

Referring to fig. 10 and 21, the inner side surface 123 of the fixing base 122 is connected to the groove surface 213 of the fixing main plate 211, and since the cylinder 56 moves 1mm more after contacting the protection cover 55, a downward pre-load is generated to help reduce the grinding dislocation, and the cylinder 56 can be a short stroke pneumatic cylinder (i.e., ADVC).

In summary, the present invention can obtain an effect of greatly increasing the yield by a new design, and the dislocation of the drill bit during grinding can be effectively eliminated by using the cylinder to push the protection cover to make the propping plane press the drill body, and the protection cover can be rotated by the movement of the slide base, so as to obtain the effect of pressing the drill bit during grinding. Therefore, those skilled in the art can devise various modifications without departing from the scope of the appended claims.

[ notation ] to show

10: a drill point 11: drill body

12: drill shank 21, 22: magnetic reed switch

50: drill point grinding device 51: collet assembly

52: the collet 53: protective cylinder assembly

54: drill holder 55: protective cover

56: the cylinder 57: driving part of protective cover

61: first side 62: second side

70: abutting plane 71: the first driving hole

721: first axial hole 57: driving part of protective cover

61: first side 62: second side

70: abutting plane 71: the first driving hole

721: first axial hole 81: movable axle center

82: fixing the shaft center 91: base seat

92: second axial hole 93: sliding chute

101: a slide base 102: the second driving hole

111: cylinder push groove 112 notch

121: cover plate 122: fixed seat

123: inner side surface 131: push rod

132: ends 133, 134: chute

141: first nut

152: second nut 161: long slot

GL: groove length VL: length of gap

181: spring PS push stroke

191: v-shaped groove 201: sliding rail

202: standard slider 203: rotary disc

204: the rotating base 211: fixed mainboard

212: upper opening 213: grooved surface

221: the fixed side plate 222: drill point drill body containing part

230: abutting portion 231: arm of force

ES: elastic space

Claims

1. A drill point grinder assembly comprising:

a grinding wheel;

the collet assembly is provided with a collet used for clamping a drill bit, wherein the drill bit is provided with a drill body, and the drill body is provided with a first side and a second side opposite to the first side; and

protection cylinder assemblage includes:

the first side of the drill body is arranged on the drill seat;

the protective cover is provided with an abutting plane; and

the cylinder pushes the protective cover to make the propping plane tightly press the second side of the drill body, so that the drill body is fixed between the propping plane and the drill needle seat for grinding the grinding wheel.

2. The drill point polishing apparatus of claim 1, wherein the protective cylinder assembly further comprises a movable shaft, a fixed shaft, and a protective cover driving portion disposed between the protective cover and the cylinder, and the protective cover further comprises a first driving hole and a first shaft hole, the protective cover driving portion comprising:

the base is provided with a second axle hole and a sliding chute, wherein the first axle hole is connected with the second axle hole through the fixed axle so that the protective cover is pivoted on the base;

a sliding seat arranged in the sliding groove and provided with a second driving hole and an air cylinder pushing groove, wherein the first driving hole is connected with the second driving hole through the movable axis, so that the protective cover rotates through the movement of the sliding seat; and

the cover plate covers the base and the sliding seat.

3. The drill point grinder assembly of claim 2 wherein the base is mounted on a mounting base, the cylinder has a push rod, and the end of the push rod is provided with a first nut for pushing the slide in the cylinder push slot, and the slot of the cylinder push slot is provided with a second nut, such that when the cylinder pulls back the push rod, the first nut abuts against the second nut to pull back the slide.

4. The drill point grinder assembly of claim 3 wherein said first driving hole is an elongated slot having a slot length, said movable shaft moves to about one third of said slot length below and above said elongated slot when said air cylinder pushes said slide, causing said protective cap to press against said drill body, said air cylinder retracting said slide causing said protective cap to release said drill body by a gap length above said movable shaft and said elongated slot of about one fifth of said slot length.

5. The drill point grinding device as claimed in claim 2, wherein the cylinder pushing slot is provided with a spring, so that the cylinder pushes the slide base through the spring, and the spring is used to buffer the pushing stroke strength of the cylinder after the protection cover contacts the drill body.

6. The drill point grinding apparatus as claimed in claim 1, wherein the drill point holder has a V-shaped groove, and the drill body is seated in the V-shaped groove to prevent the drill body from shaking during grinding.

7. A drill point grinding method using the drill point grinding apparatus according to any one of claims 1 to 6, comprising:

placing the drill point on the drill point seat;

the cylinder pushes the sliding seat to make the protection cover rotate to press the drill body of the drill bit, so that the protection cover and the drill bit seat fix the drill body for grinding the drill bit; and

after the drill point is ground, the cylinder pulls back the slide seat to rotate the protection cover to release the drill body of the drill point, so that the ground drill point is removed from the drill point seat.

8. The method of claim 7, further comprising removing the drill bit by using a slide and a standard slide mounted on a turntable mounted on a rotary table in an upper opening of the stationary main plate.

9. A protection cylinder assembly for fixing a drill bit is used in conjunction with a collet chuck for clamping the drill bit so as to facilitate the machining of the drill bit, and comprises:

a drill base having a drill body accommodating portion for accommodating the drill bit;

a fixed seat;

the protective cover is pivotally arranged on the fixed seat and is provided with a propping part which is matched with the drill bit body accommodating part to fix the drill bit between the protective cover and the drill bit body accommodating part; and

the cylinder is used for driving the protective cover to determine the relative position of the protective cover and the drill base so as to facilitate the grinding of the drill base by the grinding wheel.

10. The protection cylinder assembly as claimed in claim 9, further comprising a base, a fixed main plate and a fixed side plate, wherein the base is mounted on the fixed base, the fixed base is mounted on the fixed main plate, the fixed main plate is locked on the fixed side plate, the pushing of the cylinder causes the protection cap to rotate to make the propping portion press against the drill body of the drill point, so that the drill body is fixed between the propping portion and the drill point seat, and when the drill point is ground, the pulling back of the cylinder causes the protection cap to rotate to make the propping portion release the drill body of the drill point.