JPH09285905A - Extra fine deep hole machining method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily machine a straight deep hole with high precision by bringing a rotating extra fine drill tip protruded from a guide plate into contact with the lower side of a material to be machined with the deep hole, bring a guide plate upper end and a material lower part into mutual contact or close to each other when the drill is lifted and advanced to the material, and moving the drill upward. SOLUTION: A drill shank 12, in which a drill 11 with a diameter of 0.5mm or less is screwed and fixed at the tip, is fitted in a cylindrical guide cylinder body 13 so that an edge point part at the drill tip can be protruded by about 2-2.5mm. A through hole 14, in which a drill edge point part is fitted and supported, is formed at the tip of the guide tubular body 13, and a cylindrical tubular body 15 with a larger diameter than the tubular body 13 is screwed and fixed in the rear end of the guide tubular body 13. A coil spring 17 is arranged between a ring type projection 16 formed in the drill shank 12 and the rear end of the guide tubular body 13. The drill 11 is brought close to the lower side of a material 19 to be machined.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention has a diameter of 0.5 mm.
The present invention relates to a deep hole processing method capable of forming the ultra-fine deep holes or openings straight and with high accuracy and easily.

[0002]

2. Description of the Related Art A deep hole drilling method in which a drill is mounted on a chuck and a deep hole or an opening is formed in a workpiece while rotating the drill has been widely used. Conventional drills for forming pores include a luma type drill 1 as shown in FIG. 3 and a straight type drill 2 as shown in FIG.
It has been known.

As shown in FIG. 3, a conventional luma type drill 1 has a diameter of 0.1 mm at the tip of a shank portion 3 having a diameter of about 1 mm.
The blade tip 4 of 2 mm is continuously provided to have a length of 2 to 2.5 mm. However, since this blade tip 4 is short, only a hole of about 1.5 to 2 mm can be formed at most, which is a deep hole. It couldn't be processed at all.

As shown in FIG. 4, the straight type drill 2 has a blade tip portion and a shank portion having a diameter of about 0.2 mm and a length of about 20 mm, so that the purpose is simply to make a hole. Can be used for deep hole drilling. However, this drill cannot be used for the purpose of forming a straight deep hole with high accuracy, because the tip edge of the drill is shaken or bent during deep hole formation.

On the other hand, recently, ultra-fine 50 μ-1
There is an increasing demand for probe contacts for inspecting disconnections, shorts, etc. of semiconductor circuit liquid crystal electrode portions and printed circuit boards with a pitch of 00 μ, and the applicant has developed a probe contact that fully meets this requirement. I applied for a patent earlier.

This probe contact, however, has a diameter of about 0.2 mm, and is used by fitting and fixing a large number of about 100 to 1500 pieces on an electrical equipment inspection jig having a thickness of about 6 mm. However, in the conventional deep hole machining method, the diameter for fitting and fixing the probe contact is 0.
It was extremely difficult to form a deep hole with a diameter of 4 mm or less and 10 times or more the drill diameter with high accuracy and straightness. For example, the electrical equipment inspection jig has a structure in which six plates each having a thickness of about 1 mm are laminated, and an opening of about 0.2 mm is formed in each plate having a thickness of 1 mm, and these are integrated with an adhesive. Although it is possible to do so, it is extremely difficult to attach the holes by making 100 to 1500 holes formed in the six plates so that they are completely aligned with each other.
It was not practical as an industrial method.

In order to solve such a problem, the present applicant intends to drill a deep hole of a drill by making the drill a luma type drill type and forming the blade tip portion to have a blade length five times or more that of the conventional drill. The guide barrel supporting the drill can be moved backwards so that the drill always supports the drill at a position in contact with or close to the material by moving the drill into the material. We developed a deep hole drilling method that allows an extremely fine deep hole to be formed by entering from above while drilling, and filed a patent application earlier.

[0008]

The deep hole drilling method described above is extremely epoch-making in that extremely small hole drilling can be formed. However, since this method was to move the drill from the top to the bottom, the chips generated when drilling the holes enter the spiral groove of the drill and are lifted upward, but the chips spiral. In the case of an ultra-fine type drill, if it is clogged in a groove, the tip of the drill will sway and meander, and it may not be possible to form a straight deep hole. Not only that, but also the breakage or breakage of the drill may occur due to the clogging of chips in the middle part of the drill.

The present invention has been made paying attention to such points, and it is an object of the present invention to provide a deep hole drilling method capable of accurately and easily performing straight deep hole drilling with a diameter of 0.5 mm or less. To aim. In the conventional machining of extremely small holes with a diameter of 0.5 mm or less, the depth that can be accurately machined is generally limited to 6 to 10 times the maximum drill diameter. It is an object of the present invention to provide a deep hole processing method capable of forming a straight deep hole 20 times or more with high accuracy and easily.

[0010]

In order to achieve the above object, the present inventor has earnestly studied and, as a result, when drilling with a conventional drill, the drill was moved from the upper side to the lower side. By moving it upwards from above, the chips easily fall down from the spiral groove due to gravity, so the chips are not stuck in the spiral groove and the drill is not broken or the tip of the drill is not shaken. They have found that deep holes can be easily formed, and have reached the present invention.

That is, according to the present invention, the tip of a rotating ultra-fine drill slightly protruding from the guide plate is brought into contact with the lower portion of the material to be deep-hole-drilled, and the guide is moved during the ascent of the drill into the material. The upper edge of the plate and the lower part of the material are always in close proximity or in contact with each other to prevent the drill from moving and to move the drill upward, and the chips generated by drilling are clogged in the middle part to generate torque. It is characterized in that it is made to fall naturally without being caused to do so.

In short, the present invention is characterized in that the drill is moved from the bottom to the top. However, the conventional drill has not been moved from the bottom to the top, and such an idea is completely known. Has not been done. Moving the drill from top to bottom was easier to work with, and when using a conventional thickness drill, the rigidity of the drill was strong even if the spiral groove was clogged with chips. This is because the tip of the drill did not swing or meander.

By moving the drill from the bottom to the top and further micro-vibrating the drill with ultrasonic waves, the rising torque of the drill can be reduced and a straight deep hole can be formed very easily. This is because the material that is the work piece is finely crushed by slightly vibrating the drill,
Therefore, since the drill moves up the crushed portion, the rising torque can be reduced.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a first embodiment of the present invention. The deep hole processing tool used in the present invention has a drill shank 12 in which a drill 11 having a diameter of 0.5 mm or less is screwed and fixed to the tip, and the blade tip portion of the drill tip is 2 to 2.5 m.
It is fitted in a cylindrical guide cylinder 13 so that it can project by about m, and a through hole 14 for fitting and supporting a drill blade portion is formed at the tip of the guide cylinder 13 and at the rear end of the guide cylinder 13. ,
A ring-shaped projection 16 formed on the drill shank 12 by screwing and fixing a cylindrical cylinder 15 having a diameter larger than that of the cylinder 13.
A coil spring 17 is interposed between and the rear end of the guide cylinder 13. still,
The drill 11 is located below and close to the material 19 that is the workpiece.

Reference numeral 18 in the drawing denotes an ultrasonic wave generator, which applies ultrasonic vibrations to the drill 11 to slightly vibrate the drill 11 while the material 19 is being drilled by the drill 11. In the present invention, it is not always necessary to vibrate with ultrasonic waves, but by vibrating with ultrasonic waves, it is possible to extremely easily form a straight ultra-fine hole or opening.

The drill 11 may be formed with a spiral groove as in the conventional case, but if chips can fall downward, a straight groove or a cutout may be used instead of the spiral groove. It doesn't matter. The guide cylinder 13 and the drill 11 are
Although they rotate together, the drill 11 and the through hole 14 rub against each other to some extent because they slip a little, so the guide cylinder 13 is made of a wear resistant material, and the through hole 14 is resistant to wear. It is advisable to form a coating of abradable material.

In the above embodiment, the drill 11 is screwed and fixed to the drill shank 12, but it does not matter if both are integrally formed. However, this is convenient because it is possible to replace only the drill 11 when the drill 11 is worn or broken.

Although one end of the coil spring 17 is fixed to the ring-shaped protrusion 16, the coil spring may be simply interposed without being fixed. Also,
The ring-shaped protrusion 16 also has a role of a stopper that locks the cylindrical tubular body 15 to the step portion 20 formed in the lower portion thereof and prevents the cylindrical tubular body 15 from coming off from the drill shank 12. Needless to say, the protrusion 16 need not be ring-shaped but may be a simple protrusion.

The upper surface of the guide cylinder 13 has a material 19 to be perforated.
It is also possible to form a ring-shaped projection made of a material that does not damage the material because it contacts with. The drill used in the present invention may be a drill having a diameter of 0.5 mm or more,
It is particularly effective when applied to a drill having a diameter of 0.5 mm or less for forming a deep hole having a diameter of 0.5 mm or less, which has been difficult to machine conventionally. The lower limit of the diameter of the drill can be applied to a currently commercially available drill having a diameter of 0.05 mm without any problem, and even if it is less than this, it can be used as a drill.

FIG. 2 is a sectional view showing a second embodiment of the present invention, in which an anti-vibration plate 21 having a substantially L-shaped cross section is fixed to a base (not shown) by a screw 22, and The tip 23 is placed in contact with or close to the lower part of the material (not shown) that is the workpiece, and
The example which formed the through-hole 14 which fits the drill 11 so that it can move back and forth is shown.

Chuck mounting part at rear end of drill (not shown)
Is formed in a stepped portion having a thickness that can be attached to an ordinary chuck. Also in the above-described embodiment, it is preferable to vibrate the drill 11 with ultrasonic waves during drilling, as in the first embodiment. In the above-mentioned embodiment, since the anti-vibration plate 21 is completely fixed and the thickness of the tip 23 is adjusted, the drill 11 can be formed to have a desired length. Even if it was a deep hole or through hole of length,
It can be formed straight without any trouble.

Next, the deep hole drilling method of the present invention using the deep hole drilling tool described in the first embodiment will be described. First, the rear end of the drill shank 12 of the deep hole drilling tool of the present invention shown in FIG. 1 is mounted on a drill chuck (not shown) and rotated. At this time, not only the drill 11, but also the guide cylinder 13 and the cylinder 15 rotate together. It is preferable that the upper end of the drill 11 projects from the upper end of the guide cylinder 13 by 2 to 2.5 mm.

Then, the ultrasonic generator 18 is turned on, ultrasonic vibration is applied to the drill shank 12 to slightly vibrate the drill 11, and the upper end of the drill 11 is thickened to a thickness of 6
mm material 19 is applied from below. The drill 11 travels straight through the material 19 while being perforated by microvibration, and the chips produced by the perforation drop by gravity through spiral or linear grooves. The guide cylinder 1 is interlocked with the straight movement of the drill 11.
3 moves rearward against the force of the coil spring 17. In this way, the drill 11 can be straightly moved straight into the material 19 without swinging its tip, and a through hole or a deep hole with extremely high vertical accuracy is formed.

According to the present invention, since the drill 11 moves from the bottom to the top of the material to be drilled, the chips produced by the drilling will drop downward due to gravity and will not be clogged in the groove of the drill. Since no extra torque is applied to the drill, the tip of the drill rises straight without wobbling or meandering, so that a deep hole with high linearity accuracy can be easily formed.

Further, since the drill 11 during drilling is always supported by the through hole 14 of the guide plate at a position which is always in contact with or close to the material, the entire drill is always in vertical contact with the material. It is possible to easily form an ultra-fine deep hole with high verticality without bending or bending.

Further, if the drill 11 is drilled by ultrasonic waves while slightly vibrating vertically, the ascending torque of the drill can be reduced, so that a straight deep hole can be formed more easily. Since the material is finely crushed by the slight vibration, the drill can be lifted after crushing, and the lifting torque is reduced.

[0027]

[Effect] As described above, according to the present invention, since no extra torque is applied to the drill tip, the diameter is 0.4 mm.
In the following, it is possible to extremely easily form deep holes with a linearity accuracy that is three times or more longer than the conventional one. The extremely epoch-making effect is obtained such that it is not necessary to form an extremely fine hole, and to attach and laminate the hole so that the holes are completely aligned with each other, which requires extremely low work efficiency.

[0028]

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a side view showing a conventional luma drill.

FIG. 4 is a side view showing a conventional straight type drill.

[Explanation of symbols]

11 Drill 12 Drill Shank 13 Guide Cylindrical Body 17 Coil Spring 18 Ultrasonic Wave Generator 19 Material for Forming Ultra Fine Deep Hole 21 Shake Prevention Plate

Claims (9)

[Claims] 1. A rotating ultra-fine drill tip slightly protruding from a guide plate is brought into contact with a lower portion of a material to be deep-drilled, and the upper end of the guide plate and the upper end of the guide plate are abutted while the drill is moving upward into the material. An extra fine feature characterized in that the drill is prevented from blurring so that it is always close to or in contact with the lower part of the material, the drill is moved upward, and the chips generated by drilling are dropped downward. Deep hole processing method. 2. The deep hole drilling method according to claim 1, wherein the diameter of the drill is 0.5 mm or less, and an ultrafine deep hole or an opening having a diameter of 0.5 mm or less is formed in the material. 3. The deep hole drilling method according to claim 1, wherein the drill is slightly vibrated by ultrasonic waves and is moved upward while the vibration is finely vibrated. 4. The guide plate is formed by forming a through hole into which a drill is fitted in a plate body having a predetermined thickness, and the guide plate is fixed at a position in contact with or close to the material. The deep hole drilling method according to any one of claims 1 to 3. 5. The upper surface of the guide cylinder is formed on the guide plate,
The deep hole drilling method according to claim 1, wherein the guide cylinder is configured to be moved relatively downward in association with the upward movement of the drill into the material. 6. The deep hole drilling method according to claim 5, wherein the guide cylinder is moved relatively downward against the force of the elastic body. 7. The drill is connected to a drill shank having a diameter larger than that of the drill, the guide cylinder is movably fitted to the drill shank, and the drill is movably supported at the tip of the guide cylinder. 7. The deep hole drilling method according to claim 6, wherein a through hole is formed to allow the guide cylinder to move downward against the force of the elastic body. 8. The elastic body is a coil spring, wherein one end of the coil spring is fixed or locked to the drill shank, and the other end of the coil spring is brought into contact with the step portion of the guide cylinder. Item 7. A deep hole drilling method according to Item 7. 9. The guide cylinder is constructed by fitting and fixing a rear portion of a small diameter cylinder to a large diameter cylinder, and the coil spring is interposed between the large diameter cylinder and the drill shank. The deep hole drilling method according to claim 8.