CN214604770U

CN214604770U - Cutter head and drill point for drilling PCB (printed circuit board)

Info

Publication number: CN214604770U
Application number: CN202022702108.9U
Authority: CN
Inventors: 陈智峰; 张辉
Original assignee: Shenzhen Jinzhou Precision Technology Corp
Current assignee: Shenzhen Jinzhou Precision Technology Corp
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-11-05
Anticipated expiration: 2030-11-20

Abstract

The utility model is suitable for a PCB drilling processing technology field discloses a blade disc and is used for drill point of PCB board drilling processing, the drill point includes the drill handle and connects in the work portion of drill handle one end, be provided with the changeover portion between drill handle and the work portion, the changeover portion is round platform form, the path end of changeover portion is close to the work portion, the big footpath end of changeover portion is connected with the drill handle, the big footpath end diameter of changeover portion is less than the diameter of drill handle, when the drill point inserts the mounting hole of blade disc, the drill handle contacts the location with the connection face and controls the drill handle and exposes the length outside the mounting hole; or the diameter of the large-diameter end of the transition section is equal to that of the drill handle, and when the drill bit is inserted into the mounting hole of the cutter head, the peripheral surface of the transition section is in contact positioning with one end, close to the mounting section, of the connecting surface to control the length of the drill handle exposed out of the mounting hole. The utility model provides a cutter head and be used for drill point of PCB board drilling processing need not to cooperate the lantern ring to use, have positioning accuracy height, advantage that use cost is low.

Description

Cutter head and drill point for drilling PCB (printed circuit board)

Technical Field

The utility model belongs to the technical field of PCB drilling processing, especially, relate to a blade disc and be used for drill point of PCB board drilling processing.

Background

With the development of Printed Circuit Boards (PCBs) toward miniaturization, lightness and thinness, the line width and line distance of the PCB lines become narrower and narrower, and manufacturers have increasingly high requirements for the position precision and drilling quality of drilling processing, and meanwhile continuously pursue cost reduction.

In the drilling process, the micro drill point needs to be used by the lantern ring when being inversely inserted on the cutter head to control the length of the micro drill point exposed out of the cutter head. As shown in fig. 8, a collar 5 is sleeved at a predetermined position of the drill point shank, the drill point 1a of the existing structure is firstly accommodated in the cutter head 4a, and the drilling equipment grabs the drill point 1a of the existing structure from the cutter head 4 a. The cutter head 4a is a component for accommodating a drill point, the cutter head 4a is provided with a mounting hole 41a, the upper end of the mounting hole 41a is provided with a counter bore 43a, and the aperture of the counter bore 43a is larger than that of the mounting hole 41 a. After the drill bit 1a of the prior structure sleeved with the collar 5 is inserted into the mounting hole 41a, the collar 5 falls into the counter bore 43a at the upper end of the mounting hole 41a, namely, the collar 5 and the counter bore 43a are used for realizing positioning. However, the use of a micro drill bit with a collar can cause the following problems:

1. the position accuracy of the collar is poor. This affects the vertical positioning accuracy of the spindle, resulting in a drill-through plate or a broken needle. For example, when a 5G communication board with high frequency, high speed and high interconnection is processed, the whole board is scrapped due to broken pins or deviated holes, and the production cost is greatly increased.

2. The material and the shape of the lantern ring are not uniform. When the drill bit rotates at a high speed, the collar made of uneven materials can increase the rotational inertia fluctuation of the drill bit, so that the vibration of the drill bit is aggravated, the deviation of a drilling drop point is increased, and the phenomena of poor machining such as obvious deviated holes and poor hole site precision are generated.

3. The upper and lower collars require specialized machinery and operators, and purchasing the collars requires additional expense and increased drilling costs.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of above-mentioned technical problem at least, provide a blade disc and be used for the drill point of PCB board drilling processing, need not to use the lantern ring, and need not to reform transform the machine, have positioning accuracy height, chip removal ability advantage strong, use cost hangs down.

The technical scheme of the utility model is that: the cutter head comprises a cutter head body, wherein the cutter head body is provided with a mounting hole for mounting a drill point, the mounting hole comprises a positioning section and a mounting section, the positioning section is located above the mounting section, the diameter of the positioning section is larger than that of the mounting section, the positioning section is connected with the mounting section through a connecting surface, and the included angle between the connecting surface and the horizontal plane is 0-85 degrees.

Optionally, the mounting hole is provided with a plurality of mounting holes, and the plurality of mounting holes are arranged in an array.

Optionally, the mounting hole has a plurality of different length ratios of the positioning section and the mounting section.

The utility model also provides a drill point for PCB board drilling processing, including the drill handle with connect in the work portion of drill handle one end, be provided with the changeover portion between the drill handle and the work portion, the changeover portion is round platform form, the path end of changeover portion is close to the work portion, the path end of changeover portion with the drill handle is connected, the path end diameter of changeover portion is less than the diameter of drill handle, when the drill point inserts the mounting hole of the blade disc as in any one of claims 1 to 3, the drill handle contacts with the connection face and fixes a position and control the drill handle exposes the length outside the mounting hole; or, the diameter of the large-diameter end of the transition section is equal to that of the drill handle, and when the drill bit is inserted into the mounting hole of the cutter head as claimed in any one of claims 1 to 3, the peripheral surface of the transition section is in contact with one end, close to the mounting section, of the connecting surface to control the length of the drill handle exposed out of the mounting hole.

Optionally, when the diameter of the large-diameter end of the transition section is equal to the diameter of the drill shank, an included angle between a circular truncated cone generatrix of the transition section and the axis of the transition section

Wherein L is₃To the small diameter end of the transition sectionThe distance of handle bottom, D is the diameter of installation section in the mounting hole, and D1 is the minor diameter end diameter of changeover portion, and H is the distance of the contact point that the global of changeover portion and connecting face are close to installation section one end to the blade disc upper surface.

Optionally, the taper of the transition section is 0.01-0.05 when the diameter of the large diameter end is smaller than the diameter of the drill shank.

Optionally, when the diameter of the large-diameter end is smaller than that of the drill shank, a chamfer is arranged at the joint of the large-diameter end of the transition section and the drill shank.

Optionally, the angle of the chamfer is 30-85 °.

Optionally, the drill shank has a length that is 40% to 75% of the length of the drill bit.

Optionally, the length of the working portion is 0.9mm-10.5mm, and the diameter of the working portion is 0.05mm-2.7 mm.

Optionally, the outer peripheral face of work portion is provided with two about the symmetrical chip removal owner groove in work portion center, two the chip removal owner groove is followed with the heliciform the work portion front end is extended towards the rear end and is intersected in a bit, two the chip removal owner groove respectively with the front end terminal surface of work portion intersects and obtains two cutting edges, the outer peripheral face of work portion still be provided with at least two from the intersection to the chip removal auxiliary tank of spiral extension side by side in work portion rear end.

Optionally, the outer peripheral surface of the working portion is provided with two chip removal main grooves symmetrical about the center of the working portion, and the two chip removal main grooves extend from the front end of the working portion toward the rear end in a spiral shape.

Optionally, the outer peripheral face of work portion is provided with one with the heliciform follow the chip removal owner groove that the work portion front end extends towards the rear end, chip removal owner groove with the front end terminal surface of work portion intersects and obtains a cutting edge.

The utility model provides a blade disc and be used for drill point of PCB board drilling processing, in this drill point, be provided with the changeover portion that is round platform form between drill handle and working part, according to the relation of the diameter of changeover portion major diameter end and drill handle diameter, can obtain the drill point of two kinds of different structures, when packing the drill point into the mounting hole of blade disc, can directly utilize the drill handle to contact with the connecting surface line face or can directly utilize the global of changeover portion to contact with the connecting surface near the terminal line face of mounting section and realize the location fit, come the length that the drill handle of the drill point exposes outside the mounting hole of control packing into the blade disc mounting hole, when drilling equipment is grabbing this drill point automatically, can hold the precision of getting of drill point effectively; meanwhile, the round table-shaped transition section can also enlarge the space at the front end of the drill point, and a dust suction device in the drilling equipment is favorable for adsorbing and collecting cuttings. Compare with the drill point of current structure, the utility model provides a drill point need not to cooperate the lantern ring to use, has that positioning accuracy is high, whole chip removal ability is strong, advantage that use cost is low.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a drill point with a two-stage stepped structure according to an embodiment of the present invention when the diameter of the large diameter end is smaller than that of the drill shank;

FIG. 2 is a schematic structural diagram of a drill point with a three-step structure according to an embodiment of the present invention when the diameter of the large-diameter end is smaller than that of the drill shank;

FIG. 3 is a schematic structural diagram of a drill point provided by an embodiment of the present invention when the diameter of the large diameter end is equal to the diameter of the drill shank;

FIG. 4 is a schematic view of another working portion structure of a drill point with a two-step structure provided by an embodiment of the present invention when the diameter of the large diameter end is smaller than that of the drill shank;

fig. 5 is a schematic structural diagram of a cutter head according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a mounting hole in a cutter head according to an embodiment of the present invention;

FIG. 7 is a schematic view of the drill bit of FIG. 1 in aligned engagement with the cutter head of FIG. 4;

FIG. 8 is a schematic view of the drill bit of FIG. 3 in aligned engagement with the cutter head of FIG. 4;

figure 9 is a schematic illustration of the positioning of a drill pin engaging collar of a prior art construction.

In the figure, 1-drill shank, 2-working part, 20-intersection point, 21-main chip removal groove, 22-auxiliary chip removal groove, 3-transition section, 4-cutter head body, 40-mounting hole, 41-mounting section, 42-connecting surface, 43-positioning section, 401-first mounting hole, 402-second mounting hole, 403-third mounting hole, 5-lantern ring, L1-length of the generatrix of the circular truncated cone of the transition section, included angle between the length of the generatrix of the circular truncated cone of the alpha-transition section and the axis of the drill shank, L1-length of the drill shank, L2-length of the transition section, D1-diameter of the drill shank, diameter of the small-diameter end of the D1-transition section, diameter of the large-diameter end of the D2-transition section and diameter of the D3-diameter of the working part. C-chamfering, H-the length of the drill handle of the drill point exposed out of the mounting hole, the distance from an H-positioning point to the upper surface of the cutter head body, L3-the distance from the small-diameter end of the transition section to the bottom of the drill handle, D-the diameter of the mounting section, 1 a-the drill point of the existing structure, 4 a-the cutter head matched with the lantern ring for use, 41 a-the mounting hole in the cutter head matched with the lantern ring for use, 43 a-the counter bore in the cutter head matched with the lantern ring for use, and H-the standard upper ring height.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that the terms "disposed" and "connected" should be interpreted broadly, and may be, for example, directly disposed or connected, or indirectly disposed or connected through intervening elements or intervening structures.

In addition, in the embodiments of the present invention, if there are terms of orientation or positional relationship indicated by "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., it is based on the orientation or positional relationship shown in the drawings or the conventional placement state or use state, and it is only for convenience of description and simplification of description, but does not indicate or imply that the structures, features, devices or elements referred to must have a specific orientation or positional relationship, nor must be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

The various features and embodiments described in the detailed description may be combined in any suitable manner, for example, different embodiments may be formed by combining different features/embodiments, and various combinations of features/embodiments are not separately described in order to avoid unnecessary repetition in the present disclosure.

As shown in fig. 5 and 6, the embodiment of the utility model provides a cutter head, including cutter head body 4, cutter head body 4 is provided with the mounting hole 40 that is used for installing the drill point, and mounting hole 40 includes location section 43 and installation section 41, and location section 43 is located the top of installation section 41, and the diameter of location section 43 is greater than the diameter of installation section 41, connects through connecting face 42 between location section 43 and the installation section 41, and connects the contained angle of face 42 and horizontal plane and be 0-85.

For the convenience of understanding, the following description will be made with reference to a drill point for drilling a PCB. The drill point is used for occasions with high requirements on hole position precision in the PCB drilling process. As shown in fig. 1 to 4, the drill point comprises a drill handle 1 and a working part 2 connected to one end of the drill handle 1, a transition section 3 can be arranged between the drill handle 1 and the working part 2, wherein the transition section 3 can be in a circular truncated cone shape, the small diameter end of the transition section 3 is close to the working part 2, and the large diameter end of the transition section 3 is connected with the drill handle 1, so that the front end space of the drill point is enlarged in the drilling process, the dust suction device of the drilling equipment is beneficial to sucking away chips discharged from a drill hole in the drilling process, and meanwhile, the transition section 3 is designed into a circular truncated cone shape, thereby being beneficial to reducing the weight of the front part of the drill point, effectively reducing the rotation swing amplitude of the drill point and ensuring the machining precision. Two different structures of drill points can be obtained according to the relation between the diameter D2 of the large-diameter end of the transition section and the diameter D1 of the drill shank. When the drill pins with the two structures are inserted into the mounting hole 40 of the cutter head, the following two positioning and matching modes are provided:

as shown in fig. 7, when the diameter D2 of the large-diameter end of the transition section is smaller than the diameter D1 of the drill shank, a step structure is formed between the drill shank 1 and the transition section 3, and when a drill bit is inserted into the mounting hole 40 of the cutter head, the drill shank 1 can be directly positioned by contacting the connecting surface 42, i.e. the drill shank 1 contacts the connecting surface 42 on a line and a plane, so as to control the length of the drill shank 1 exposed out of the mounting hole 40;

as shown in FIG. 8, when the diameter D2 of the large diameter end of the transition section is equal to the diameter D1 of the drill shank, the circumferential surface of the transition section 3 is positioned in contact with the end of the connecting surface 42 adjacent to the mounting section 41 when the drill bit is inserted into the mounting hole 40 of the cutter head, thereby controlling the length of the drill shank 1 exposed out of the mounting hole 40.

Therefore, the drill handle is not required to be matched with the lantern ring 5 for use, the self structure is directly utilized to realize the positioning matching with the mounting hole 40 of the cutter head, the length h of the drill handle 1 of each drill point arranged in the mounting hole 40 and exposed out of the mounting hole 40 is kept consistent, and when the main shaft of the drilling equipment automatically grabs the drill point, the grabbing precision of each drill point can be effectively grasped. Compared with the drill point with the prior structure, the drill point does not need to be matched with the lantern ring 5, and has the following advantages:

1. the drilling position error caused by the uneven material of the lantern ring 5 can be avoided, so that the hole position precision is improved;

2. axial positioning errors caused by the position precision difference of the lantern ring 5 can be avoided, so that the tool grabbing precision of the main shaft is improved, and the drilling depth control precision is finally improved;

3. the method can be used for the machining process of the ultrahigh-rotating-speed precision drilling machine. On the ultrahigh rotating speed drilling machine, the problems of broken needles, poor hole deviation and shortened service life of the main shaft caused by the increase of the main shaft swing of the drilling machine due to the lantern ring 5 can be avoided.

The utility model discloses a blade disc is compared with current blade disc, is provided with the connection face 42 that is used for the location in mounting hole 40, and other whole sizes and appearance do not change, when consequently using the drilling equipment of various models with this blade disc, need not change the structure and the size of current drilling equipment, and easily the update of upgrading, use cost is low.

In the cutter head, the included angle between the connecting surface 42 and the horizontal plane may be 10 °, 15 °, 20 °, 25 °, 30 °, 40 °, 45 °, 50 °, 55 °, 60 °, 65 °, 70 °, 75 °, 80 °, or the like.

In some embodiments, the connection surface 42 may be angled 70 ° ± 2 ° from horizontal.

Alternatively, as shown in fig. 5, the mounting hole 40 may be provided in plurality, and the plurality of mounting holes 40 may be arranged in an array.

Alternatively, as shown in fig. 6, the mounting hole 40 has a plurality of length ratios of the positioning section 43 and the mounting section 41, and by changing the length ratios of the positioning section 43 and the mounting section 41 in the different mounting holes 40, when drill bits with different blade lengths are loaded into the mounting hole 40, the length H of the shank of the drill bit with different blade lengths exposed out of the mounting hole 40 can be ensured to be the same, and when the drilling equipment automatically grabs the drill bit, the drilling precision can be effectively grasped, and the different grabbing requirements of the drill bits with different blade lengths can be met.

In some embodiments, the mounting holes 40 may include a first mounting hole 401, a second mounting hole 402, and a third mounting hole 403, wherein the length ratios of the positioning section 43 and the mounting section 41 in the first mounting hole 401, the second mounting hole 402, and the third mounting hole 403 are different. It is understood that the mounting holes 40 may also include a fourth mounting hole, a fifth mounting hole, a sixth mounting hole, etc.

In some embodiments, as shown in fig. 6, the length of the positioning section 43 in the first mounting hole 401 is the shortest, and the length of the positioning section 43 in the third mounting hole 403 is the longest, that is, the length ratio of the positioning section 43 to the mounting section 41 in the first mounting hole 401, the second mounting hole 402, and the third mounting hole 403 may be increased in sequence on the premise of keeping the total length of the mounting hole 40 unchanged.

Specifically, as shown in fig. 1, the cutter head body 4 may be a rectangular structure, a plurality of mounting holes 40 which are distributed along the length direction of the cutter head body 4 and located on the same straight line are defined as a row, and a plurality of mounting holes 40 which are distributed along the width direction of the cutter head body 4 and located on the same straight line are defined as a column. In some embodiments, any two adjacent mounting holes 40 in the same row have the same size, and any two adjacent mounting holes 40 in the same column have different sizes, for example, the first row is the first mounting hole 401, the second row is the second mounting hole 402, and the third row is the third mounting hole 403. Or, the sizes of any two adjacent mounting holes 40 in the same row are different, and the sizes of any two adjacent mounting holes 40 in the same column are the same, for example, the first column is the first mounting hole 401, the second column is the second mounting hole 402, and the third column is the third mounting hole 403. It is understood that the first mounting holes 401, the second mounting holes 402 and the third mounting holes 403 may have other distribution patterns. For example, the distribution of the first, second, and third mounting

holes

401, 402, and 403 may also be distributed according to a specific processing order, thereby facilitating the drilling process.

Specifically, the depths of the first mounting hole 401, the second mounting hole 402, and the third mounting hole 403 may each be 10mm to 30 mm.

In some embodiments, the first mounting hole 401, the second mounting hole 402, and the third mounting hole 403 may each have a depth of 10 mm.

Alternatively, the cutter head body 4 may be made of a metal material, or the cutter head body 4 may be made of plastic, and in particular, the cutter head may be manufactured through an injection molding process.

In the drill point for drilling the PCB, as shown in fig. 8, when the diameter D2 of the large-diameter end of the transition section is equal to the diameter D1 of the drill handle, the included angle between the generatrix of the truncated cone of the transition section 3 and the axis of the transition section 3 is formed

Wherein L is₃The distance from the small-diameter end of the transition section 3 to the bottom of the drill shank 1, the diameter of the mounting section 41 in the mounting hole 40, the diameter of the small-diameter end of the transition section D1, the distance from the positioning point to the upper surface of the cutter head body 4 (namely the distance from the contact point of the peripheral surface of the transition section 3 and the end of the connecting surface 42 close to the mounting section 41 to the upper surface of the cutter head body 4), and the distance from the positioning point to the upper surface of the cutter head body 4 is a standard value and is related to the design of the cutter head. I.e. in the cutter headUnder the condition that the size of the mounting hole 40 is determined, an included angle alpha between a circular truncated cone generatrix of the transition section 3 and the axis of the transition section 3 can be determined according to the distance H from the positioning point to the upper surface of the cutter head body 4, and when the design of the drill point is changed, the included angle alpha between the circular truncated cone generatrix of the new transition section 3 and the axis of the transition section 3 is calculated through the formula, so that the heights of drill handles 1 exposed out of the mounting hole 40 are kept consistent after the drill points of different designs are positioned.

If various parameters of the drill bit are known, such as: an included angle alpha between a circular truncated cone generatrix of the transition section 3 and an axis of the transition section 3, a distance L3 from a small-diameter end of the transition section 3 to the bottom of the drill shank 1, and a diameter D1 of the small-diameter end of the transition section are known, and the diameter D (as a standard value) of the mounting section 41 can be obtained through a formula

The distance H from the positioning point to the upper surface of the cutter head body 4 is calculated, namely the drill bits with different lengths face each other, and the heights H of the drill handles 1 exposed out of the mounting holes 40 after the drill bits with different lengths are positioned can be kept consistent by adjusting the positions of the positioning points.

Specifically, when the diameter D2 of the large diameter end of the transition section is smaller than the diameter D1 of the drill shank, the small diameter end of the transition section 3 can be directly connected with the working part 2, and the drill point is in a two-step structure as shown in fig. 1 and 4, or a connecting section can be arranged between the small diameter end of the transition section 3 and the working part 2, and the drill point is in a three-step structure as shown in fig. 2.

Specifically, when the diameter D2 of the large-diameter end of the transition section is equal to the diameter D1 of the drill shank, the length l1 of the truncated cone generatrix of the transition section 3 is 5mm-15 mm.

Specifically, when the diameter D2 of the large-diameter end of the transition section is equal to the diameter D1 of the drill shank, the length l1 of the truncated cone generatrix of the transition section 3 is 8mm-12 mm.

Specifically, when the diameter D2 of the large-diameter end of the transition section is smaller than the diameter D1 of the drill shank, the length H1 of the drill shank 1 can be calculated according to the distance from the positioning point to the upper surface of the cutter head body 4 (the distance from the contact point of the end of the drill shank 1 connected with the transition section 3 and the connecting surface 42 to the upper surface of the cutter head body 4) and the length of the drill shank 1 required to be exposed out of the mounting hole 40, i.e., H + H, where H is the distance from the positioning point to the upper surface of the cutter head body 4 and H is the length of the drill shank 1 exposed out of the mounting hole 40.

Alternatively, when the transition section major diameter end diameter D2 is less than the shank diameter D1, the taper of the transition section 3 is 0.01-0.05. The taper of the transition section 3 can be calculated by the following formula: taper ═ L2, (d2-d1) where d2 is the diameter of the large diameter end of transition section 3, d1 is the diameter of the small diameter end of transition section 3, and L2 is the length of transition section 3.

In some embodiments, the taper of the transition section 3 is 0.01.

Alternatively, as shown in fig. 1, 2 and 4, when the transition section large diameter end diameter D2 is smaller than the drill shank diameter D1, the junction of the large diameter end of the transition section 3 and the drill shank 1 may be provided with a chamfer C. In the drilling process, the cuttings are adsorbed by the dust suction device and can be smoothly discharged to the dust suction device along the inclined surface and the chamfer C surface of the transition section 3.

Optionally, the angle of the chamfer C is 30-85.

Specifically, the angle of the chamfer C may be 40-50.

Optionally, the length of the drill shank 1 is 40-75% of the length of the drill bit. By controlling the length of the drill handle 1, the grabbing length of the drill handle 1 by the drilling equipment is long enough, the stability of the drill point is ensured in the drilling process, and the shaking of the front end of the drill point is effectively relieved.

In particular, the length L1 of the drill shank 1 is 50% -70% of the length of the drill pin.

In particular, the length L1 of the drill shank 1 is 55-60% of the length of the drill pin.

Alternatively, the length of the working portion 2 is 0.9mm-15mm and the diameter of the working portion 2 is 0.05mm-2.7 mm.

Specifically, the length of the working portion 2 is 1.2mm to 10.5 mm.

More preferably, the length of the working portion 2 is 5.5mm to 10.5 mm.

Specifically, the diameter d3 of the working portion 2 is 0.1mm to 2.0 mm.

Further, the diameter d3 of the working portion 2 is 0.1mm to 1.0 mm.

More preferably, the diameter d3 of the working portion 2 is 0.1mm-0.5 mm.

In particular, the diameter D1 of the drill shank 1 may be 1.5mm-3.175 mm. For example, the diameter D1 of the drill shank 1 may be 1.85mm, 1.90mm, 2.0mm, 2.10mm, 2.95mm, 3.0mm, 3.175mm, or the like.

The application of the drill point is applicable to the working parts 2 with different structures, and the specific conditions are as follows:

as shown in fig. 4, the outer circumferential surface of the working portion 2 may be provided with two main chip removal grooves 21 that are symmetrical with respect to the center of the working portion 2, the two main chip removal grooves 21 extend from the front end of the working portion 2 toward the rear end in a spiral shape and meet at a point 20, the two main chip removal grooves 21 respectively meet with the front end face of the working portion 2 to obtain two cutting edges, and the outer circumferential surface of the working portion 2 may be further provided with at least two auxiliary chip removal grooves 22 that extend spirally side by side from the meeting point 20 toward the rear end of the working portion 2.

Alternatively, as shown in fig. 1 to 3, the outer peripheral surface of the working part 2 may be provided with two chip discharging main grooves that are symmetrical about the center of the working part 2, and the two chip discharging main grooves extend in a spiral shape from the front end toward the rear end of the working part 2. Namely a drill point with a double-edge symmetrical structure.

Alternatively, the outer peripheral surface of the working portion 2 may be provided with a chip removal main groove extending spirally from the front end of the working portion 2 toward the rear end, and the chip removal main groove intersects with the front end surface of the working portion 2 to form a cutting edge. I.e. a drill point of single-edged construction.

The utility model also provides a drilling method, including following step:

s1, preparing the cutter head and a drill point for PCB drilling, wherein the cutter head is arranged in a tool magazine of drilling equipment, and the drill point is placed in a mounting hole 40 of the cutter head, so that one end of the drill handle 1 connected with the transition section 3 is in contact with the connecting surface 42 for positioning; or, the peripheral surface of the transition section 3 is in contact with one end of the connecting surface 42 close to the mounting section 41, so that the length of each drill bit inserted into the cutter head mounting hole 40, of which the drill handle 1 is exposed out of the mounting hole 40, is consistent. Therefore, when the drilling equipment grabs the drill point, the grabbing precision can be effectively mastered;

s2, sequentially stacking a base plate, a PCB and a cover plate on the working table;

s3, controlling a main shaft of the drilling equipment to grab the drill point from the mounting hole 40 of the cutter head and driving the drill point to move to the initial drilling position; or controlling an auxiliary clamping jaw of the drilling equipment to grab the drill point from the mounting hole 40 of the cutter head, placing the drill point on the auxiliary cutter seat, controlling a main shaft of the drilling equipment to grab the drill point and driving the drill point to move to the initial drilling position;

and S4, starting the main shaft, and drilling according to a preset drilling program.

The embodiment of the utility model provides a blade disc, be used for drill point and the processing method of PCB board drilling processing, this drill point need not to cooperate the lantern ring to use when changing over to the mounting hole 40 of blade disc, just can ensure that the drillstock 1 of every drill point exposes the length h outside the mounting hole 40 and keeps unanimous, has that application scope is wide, positioning accuracy is high, advantage that use cost is low.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modification, equivalent replacement or improvement made within the spirit and principle of the present invention should be included in the present invention.

Claims

1. The cutter head is characterized by comprising a cutter head body, wherein the cutter head body is provided with a mounting hole for mounting a drill point, the mounting hole comprises a positioning section and a mounting section, the positioning section is located above the mounting section, the diameter of the positioning section is larger than that of the mounting section, the positioning section is connected with the mounting section through a connecting surface, and the included angle between the connecting surface and the horizontal plane is 0-85 degrees.

2. The cutter head of claim 1 wherein said mounting hole is provided in plurality, and a plurality of said mounting holes are arranged in an array.

3. The cutter head of claim 1 wherein said mounting hole has a plurality of different positioning segments and length ratios of mounting segments.

4. A drill point for drilling a PCB (printed circuit board) comprises a drill handle and a working part connected to one end of the drill handle, and is characterized in that a transition section is arranged between the drill handle and the working part, the transition section is in a circular truncated cone shape, the small-diameter end of the transition section is close to the working part, the large-diameter end of the transition section is connected with the drill handle, the diameter of the large-diameter end of the transition section is smaller than that of the drill handle, and when the drill point is inserted into a mounting hole of a cutter head according to any one of claims 1 to 3, the drill handle is in contact with a connecting surface to be positioned so as to control the length of the drill handle exposed out of the mounting hole; or, the diameter of the large-diameter end of the transition section is equal to that of the drill handle, and when the drill bit is inserted into the mounting hole of the cutter head as claimed in any one of claims 1 to 3, the peripheral surface of the transition section is in contact with one end, close to the mounting section, of the connecting surface to control the length of the drill handle exposed out of the mounting hole.

5. The drill point for drilling a hole in a PCB as recited in claim 4, wherein when the diameter of the large diameter end of the transition section is equal to the diameter of the drill shank, the included angle between the truncated cone generatrix of the transition section and the axis of the transition section is larger than the included angle between the truncated cone generatrix of the transition section and the axis of the transition section

Wherein L is₃The distance from the small-diameter end of the transition section to the bottom of the drill handle, the diameter of the mounting section in the mounting hole, the diameter of the small-diameter end of the transition section D1, and the distance from the contact point of the peripheral surface of the transition section and the end, close to the mounting section, of the connecting surface to the upper surface of the cutter head H.

6. The drill point for drilling a hole in a PCB as recited in claim 4, wherein the taper of the transition section is 0.01-0.05 when the diameter of the large diameter end is smaller than the diameter of the drill shank.

7. The drill point for drilling a PCB according to claim 4, wherein when the diameter of the large diameter end is smaller than that of the drill shank, a chamfer is provided at the connection of the large diameter end of the transition section and the drill shank.

8. The drill point for PCB board drilling process of claim 7, wherein the angle of the chamfer is 30 ° -85 °.

9. The drill point for drilling process of PCB board as claimed in any of claims 4 to 8, wherein the length of the drill handle is 40% -75% of the drill point length.

10. The drill point for drilling process of PCB board as claimed in any of claims 4 to 8, wherein the length of the working part is 0.9mm-10.5mm, and the diameter of the working part is 0.05mm-2.7 mm.

11. The drill point for drilling the PCB as recited in any one of claims 4 to 8, wherein the peripheral surface of the working part is provided with two main grooves for chip removal that are symmetrical about the center of the working part, the two main grooves for chip removal extend from the front end of the working part toward the rear end in a spiral shape and meet at a point, the two main grooves for chip removal intersect with the end surface of the front end of the working part respectively to obtain two cutting edges, and the peripheral surface of the working part is further provided with at least two auxiliary grooves for chip removal that spirally extend from the meeting point to the rear end of the working part side by side.

12. The drill point for drilling of PCB boards as claimed in any one of claims 4 to 8, wherein the outer peripheral surface of the working part is provided with two main grooves for chip removal which are symmetrical about the center of the working part and extend in a spiral shape from the front end toward the rear end of the working part.

13. The drill point for drilling a hole in a PCB as recited in any one of claims 4 to 8, wherein the outer peripheral surface of the working portion is provided with a main chip removal groove spirally extending from the front end toward the rear end of the working portion, and the main chip removal groove intersects with the front end surface of the working portion to obtain a cutting edge.