CN216912221U - PCB drilling tool - Google Patents

Abstract

The utility model is suitable for a drilling equipment technical field provides a PCB boring tool, including the drill bit, the drill bit include first drill core and connect in the second drill core of first drill core one end, first drill core is provided with first helicla flute, the second drill core be provided with the second helicla flute of first helicla flute intercommunication, first drill core has first pyramis, the tapering of first pyramis is WT1, the second drill core has second pyramis, the tapering of second pyramis is WT2, satisfy 0 and be less than or equal to WT1 < WT 2. In the PCB boring tool that this application provided, because the tapering of first pyramis is less than the tapering of second pyramis, consequently the tapering of first pyramis is littleer relatively to make to grind back core thickness change less relatively in the drill bit use, thereby solve to a certain extent because of the core thickness thickening leads to the problem that drilling precision worsens, drilling quality descends.

Description

PCB drilling tool

Technical Field

The application relates to the technical field of drilling equipment, in particular to a PCB drilling tool.

Background

The modern electronic components are light, thin, short, small in development trend and have higher and higher reliability requirements, so that the requirements of drilling and hole position precision and hole wall quality of Printed Circuit Board (PCB for short) boards are continuously improved. With the requirement of continuous reduction of drilling cost in PCB plate processing, the grinding use times of drill bits used for PCB drilling are continuously increased. Therefore, the requirements for the grinding performance, the grindable times and the stability of the drill hole quality after grinding are higher and higher.

Most drill bits all have at present along with grinding the number of times and increase, and the core is thick can become thick gradually, the chisel edge is elongated, cutting edge shortens gradually scheduling problem. Along with the gradual thickening of the drill core thickness, the drill chisel edge can be gradually lengthened, thereby causing the positioning performance of the drill to be deteriorated, and the hole position precision of the drill to be deteriorated. The increase in core thickness also leads to a gradual shortening of the cutting edge, while a decrease in cutting force, which results in a decrease in drilling accuracy and in hole wall roughness, even a cutter breakage.

In summary, the drill of the prior art has poor drilling accuracy and reduced drilling quality as the number of times of grinding increases.

SUMMERY OF THE UTILITY MODEL

An object of the embodiment of this application is to provide a PCB boring tool, aim at solving among the prior art drill bit along with grinding the number of times increase, the thick thickening of core leads to the drilling precision variation, and the technical problem that the drilling quality descends.

In order to achieve the purpose, the technical scheme adopted by the application is as follows: there is provided a PCB boring tool comprising: the drill bit comprises a first drill core and a second drill core connected to one end of the first drill core, the first drill core is provided with a first spiral groove, the second drill core is provided with a second spiral groove communicated with the first spiral groove, the first drill core is provided with a first conical part, the conical degree of the first conical part is WT1, the second drill core is provided with a second conical part, the conical degree of the second conical part is WT2, and 0 is not less than WT1 and is less than WT 2.

In one possible design, the angle of the helix angle of the first helical flute ranges from 40 ° to 45 °.

In one possible design, the helix angle of the second helical flute is in the range of 45 ° to 55 °.

In one possible design, the helix angle of the second helical flute is greater than or equal to the helix angle of the first helical flute.

In a possible design, the first drill core is provided with two first spiral grooves, the front ends of the two first spiral grooves are symmetrically distributed, and the rear ends of the two first spiral grooves are intersected at the second spiral groove.

In one possible design, the second core is provided with two of the second helical flutes, which are arranged in parallel.

In one possible design, the length of the first conical part is Lwt1, the length of the first drill core is Lh, and 0.20 ≦ Lwt1 ≦ Lh; the length of the second conical part is Lwt2, the total length of the first spiral groove and the second spiral groove is L2, and Lh is not less than Lwt2 and not more than L2.

In one possible design, the first core bit has a margin with a leading end width greater than or equal to a trailing end width of the margin.

In one possible design, the blade zone has a back grinding part formed on one side of the blade zone by grinding, the diameter of the back grinding part is gradually reduced from the front end to the rear end, the diameter of the back grinding part at the front end of the blade zone is Dr1, the diameter of the back grinding part at the rear end of the blade zone is Dr2, and 0.80x Dr1 is not less than Dr2 is not less than Dr 1.

In one possible design, the end core thickness C1 of the first core bit satisfies: c1 is more than or equal to 0.50x phi D and less than or equal to 0.62x phi D, and phi D is the drilling hole diameter of the drill bit.

The application provides a PCB boring tool's beneficial effect lies in: compared with the prior art, the PCB drilling tool of this application, in the use, carries out drilling operation through the drill bit, and at the drilling in-process, after the certain life of use, because the grinding of faceted pebble and side sword, the drill bit needs to grind. The first drill core is arranged at the head, so that the grinding distance cannot exceed the length of the first drill core, and in the grinding process of the first drill core, because the taper of the first conical part is smaller than that of the second conical part, namely the taper of the first conical part is relatively smaller, the change of the core thickness is relatively smaller after the first conical part is ground, so that the problems of poor precision of a drilling hole position, reduced drilling quality and the like caused by the increase of the core thickness after the drill bit is ground are relieved or even solved to a certain extent.

Furthermore, the width of the blade band from the drill bit tip to the back is gradually reduced, the back grinding depth is gradually deepened, and the cutting sharpness of the ground drill bit is kept, so that the problems of poor drilling hole site precision, reduced drilling quality and the like caused by overlarge width of the blade band and shallow back grinding after grinding of the drill bit are relieved and even solved to a certain extent.

Drawings

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

FIG. 1 is a schematic view of a PCB drilling tool provided by an embodiment of the present application;

FIG. 2 is a schematic end view of a drill bit of a PCB drilling tool provided by one embodiment of the present application;

FIG. 3 is a cross-sectional view of a first core diameter of a PCB boring tool provided by one embodiment of the present application;

FIG. 4 is a cross-sectional view of a second core diameter of a PCB drilling tool provided by one embodiment of the present application;

FIG. 5 is a schematic illustration of the core taper of a drill bit according to an embodiment of the present application;

FIG. 6 is a schematic illustration of core taper of another drill bit provided by an embodiment of the present application;

FIG. 7 is a schematic view of a portion of a drill bit according to an embodiment of the present application;

FIG. 8 is a schematic view of a portion of a drill bit according to an embodiment of the present application;

figure 9 is a schematic end view of the drill bit of figure 8.

Reference numerals referred to in the above figures are detailed below:

1. a drill bit;

11. a first drill core;

111. a first helical groove; 112. a merging tank; 113. a margin;

12. a second drill core;

121. a second helical groove;

2. a knife handle.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application 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 present application and are not intended to limit the present application.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.

In order to explain the technical solutions of the present application, the following detailed descriptions are made with reference to specific drawings and examples.

As shown in fig. 1 to 7, the present embodiment provides a PCB drilling tool for drilling a PCB, and is particularly suitable for drilling PCB with a small diameter and an extremely small diameter, where the drilling aperture phid is 0.45mm or less. The PCB drilling tool provided by the embodiment can effectively improve the grinding performance of the drill bit 1 and improve the problem that the drilling processing quality of the drill bit 1 is reduced quickly after grinding. So that the number of grinding uses of the general drill bit 1 can be increased and the number of uses of the drill bit 1 can be reduced to finally reduce the PCB drilling processing cost.

The PCB drilling tool comprises a drill bit 1, wherein the drill bit 1 comprises a first drill core 11 and a second drill core 12 connected to one end of the first drill core 11, the first drill core 11 is provided with a first spiral groove 111, the second drill core 12 is provided with a second spiral groove 121 communicated with the first spiral groove 111, the first drill core 11 is provided with a first conical part, the taper of the first conical part is WT1, the second drill core 12 is provided with a second conical part, the taper of the second conical part is WT2, and WT1 is not less than 0 and is less than WT 2.

As shown in fig. 1, the PCB drilling tool provided in this embodiment may further include a shank 2, wherein the shank 2 is connected to an end of a second core 12 of the drill bit 1, and when a drilling operation is performed, the first core 11 is first contacted with a structure to be drilled.

For ease of installation, the diameter of the shank 2 will typically be relatively different from the diameter of the drill bit 1, with the diameter of the shank 2 being larger for ease of installation and the diameter of the drill bit 1 being smaller for ease of drilling.

Preferably, the handle 2 is connected with the drill bit 1 through a transition section, the transition section comprises one or more transition tables, the transition tables are in a circular truncated cone shape, and the diameter of the transition tables is gradually increased from one end close to the drill bit 1 to the other end. The design of transition table can avoid the stress concentration at the junction of handle of a knife 2 and drill bit 1.

The drill bit 1 may be of UC (Undercut Type) design, i.e. the drill bit 1 has a larger diameter at the front end relative to the diameter at the rear end. In an alternative embodiment of the present embodiment, the drill bit 1 comprises a first core 11 and a second core 12, the first core 11 is located at the front end of the drill bit 1, the second core 12 is located at the rear side of the first core 11, and the outer diameter of the first core 11 is larger than the outer diameter of the second core 12.

The first core 11 has a first taper portion, that is, the first core 11 may be a first taper portion as a whole, and be tapered along its own axial direction, or only a portion of the head end may be a first taper portion, and be tapered along its own axial direction, and the rear end of the first core 11 has no taper, or the taper is zero.

The second core 12 has a second taper, i.e. the second core 12 may be tapered as a whole, or only the part of the head end may be tapered, and the rear end of the second core 12 has no taper, or the taper is zero.

It should be noted that, when the taper is zero and the cross section is circular, the structure is a cylindrical structure, and when the taper is set and the cross section is circular, the structure is a conical structure or a truncated cone structure.

In an alternative embodiment of the present embodiment, the taper of the first cone portion is equal to or greater than zero, that is, the first cone portion may be a flat cone structure, for example, as shown in fig. 5, the whole first drill core 11 is the first cone portion, and the first cone portion is a flat cone structure, and the front end outer diameter and the rear end outer diameter of the first cone portion are equal, so that the core thickness is unchanged after the first cone portion is ground.

Alternatively, in another alternative embodiment, the first tapered portion may be a forward tapered structure, for example, as shown in fig. 6, the first drill core 11 is a first tapered portion as a whole, and the front end outer diameter of the first tapered portion is smaller than the rear end outer diameter of the first tapered portion.

In one possible design, as shown in FIG. 2, the end core thickness C1 of the first core 11 satisfies: 0.50 phi D and C1 and 0.62 phi D.

For example, C1 ═ 0.55 Φ D. So arranged, the drill bit 1 can be made more rigid.

Wherein phi D is the diameter of the drill bit 1, and phi D is more than or equal to 0.10mm and less than or equal to 0.45 mm. Alternatively, the maximum value of the outer diameters of the first core bits 11 can also be understood.

Preferred values of phid range: phi D is more than or equal to 0.10mm and less than or equal to 0.45 mm.

As shown in fig. 3, when the taper of the first tapered portion is 0, the core thickness C2 of the portion other than the end of the first drill core 11 is C2 — C1. When the taper of the first taper is greater than 0, C2 > C1.

As shown in FIG. 4, the second core 12 has a core thickness of C3, C3 > C2.

A first spiral groove 111 is formed in the first drill core 11, a second spiral groove 121 is formed in the second drill core 12, the first spiral groove 111 is communicated with the second spiral groove 121, and the first spiral groove 111 and the second spiral groove 121 form a chip removal groove. The number of the first spiral grooves 111 may be one or two, and the number of the second spiral grooves 121 may be one or two.

For example, when the number of the first helical flutes 111 is one, and the number of the second helical flutes 121 is one, the drill 1 has a double-edge single-flute structure. When the number of the first helical flutes 111 is two and the number of the second helical flutes 121 is two, the drill 1 has a double-edged double-flute structure.

In a preferred embodiment, the first core 11 is provided with two first helical grooves 111, and the front ends of the two first helical grooves 111 are symmetrically distributed, and the rear ends meet at the second helical groove 121.

For example, as shown in fig. 7, a merging groove 112 is provided between the first spiral groove 111 and the second spiral groove 121, the merging groove 112 is located at the front end of the second core drill 12, the two first spiral grooves 111 merge into the merging groove 112 after passing through the first core drill 11, and the merging groove 112 communicates with the second spiral groove 121. The second spiral groove 121 may be one or two.

In fig. 7, the number of the second helical grooves 121 is two, and two second helical grooves 121 are provided in parallel. The front ends of both the second spiral grooves 121 communicate with the merging groove 112. The widths of the two second helical grooves 121 may be equal or unequal.

In one possible design, the helix angle γ 1 of the first helical flute 111 is in the range of 40 ° to 45 °.

In one possible design, the helix angle γ 2 of the second helical flute 121 is in the range of 45 ° -55 °.

In one possible design, the helix angle of the second helical flute 121 is greater than or equal to the helix angle of the first helical flute 111, i.e., γ 2 ≧ γ 1. This improves the dust discharging performance of the first and second spiral grooves 111 and 121.

For example, γ 1 is 45 ° ± 2 °, and γ 2 is 52 °.

As shown in FIGS. 1, 5 and 6, in one possible design, the length of the first cone part is Lwt1, the length of the first drill core 11 is Lh, 0.20 ≦ Lwt1 ≦ Lh; the length of the second conical part is Lwt2, the total length of the first spiral groove 111 and the second spiral groove 121 is L2, and Lh is not less than Lwt2 and not more than L2.

In one possible design, the first core 11 has a margin 113, and the leading width of the margin 113 is greater than or equal to the trailing width of the margin 113. As shown in FIG. 7, the front end width of the margin 113 is b1, the rear end width of the margin 113 is b2, and 0< b2 ≦ b 1.

As shown in fig. 8 and 9, in one possible design, the land 113 has a ground back portion formed on one side of the land 113 by grinding, and the diameter of the ground back portion is gradually reduced from the front end to the rear end, that is, an inverted cone structure is formed. The diameter of the back grind at the leading end of the land 113 is Dr1, the diameter of the back grind at the trailing end of the land 113 is Dr2, 0.80 Dr1 Dr2 Dr 1. The back grinding part is designed in an inverted cone shape, so that the clearance of the back grinding part is kept to be relatively small or not changed after the drill bit 1 is used for grinding.

The helix angle gamma 3 of the back grinding part is gradually reduced from the front end to the back, and gamma 3 is less than or equal to gamma 1. The helix angle of the leading-end back grinding portion is equal to the helix angle of the first helical flute 111, and the helix angle of the back grinding portion is slightly smaller than the helix angle of the first helical flute 111 from the rear end of the first core 11, so that the width of the margin 113 formed by back cutting is gradually reduced from the tip of the drill bit 1 to the rear.

The width of the blade 113 is gradually reduced from the front end of the drill to the rear blade 113, and the depth of the ground back is gradually deepened, so that the cutting sharpness of the drill after grinding can be kept, and the problems that the width of the blade 113 is too large and the depth of the ground back becomes shallow after the drill is ground are relieved and even solved to a certain extent.

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

Claims (10)

1. The PCB drilling tool is characterized by comprising a drill bit, wherein the drill bit comprises a first drill core and a second drill core connected to one end of the first drill core, the first drill core is provided with a first spiral groove, the second drill core is provided with a second spiral groove communicated with the first spiral groove, the first drill core is provided with a first conical part, the conical degree of the first conical part is WT1, the second drill core is provided with a second conical part, the conical degree of the second conical part is WT2, and WT1 is not less than 0 and is less than WT 2.

2. The PCB drilling tool of claim 1, wherein the angle of the helix angle of the first helical flute ranges from 40 ° to 45 °.

3. The PCB drilling tool of claim 1, wherein the helix angle of the second helical flute is in the range of 45 ° -55 °.

4. The PCB drilling tool of claim 1, wherein a helix angle of the second helical flute is greater than or equal to a helix angle of the first helical flute.

5. The PCB drilling tool of claim 4, wherein the first drill core is provided with two first helical flutes, and the front ends of the two first helical flutes are symmetrically distributed, and the rear ends of the two first helical flutes meet at the second helical flute.

6. The PCB drilling tool of claim 4, wherein the second core is provided with two of the second helical flutes, the two second helical flutes being arranged in parallel.

7. The PCB drilling tool of any one of claims 1 to 6, wherein the first taper portion has a length of Lwt1, the first core bit has a length Lh, 0.20 ≦ Lwt1 ≦ Lh; the length of the second conical part is Lwt2, the total length of the first spiral groove and the second spiral groove is L2, and Lh is not less than Lwt2 and not more than L2.

8. A PCB drilling tool as claimed in any one of claims 1 to 6 wherein the first core has a margin having a leading width greater than or equal to a trailing width of the margin.

9. The PCB drilling tool of claim 8, wherein the land has a ground back portion ground formed at one side of the land, the ground back portion having a diameter gradually decreasing from a front end to a rear end, the ground back portion at the front end of the land having a diameter Dr1, the ground back portion at the rear end of the land having a diameter Dr2, 0.80x Dr1 Dr2 Dr 1.

10. A PCB drilling tool as claimed in any one of claims 1 to 6 wherein the end core thickness C1 of the first drill core satisfies: c1 is more than or equal to 0.50x phi D and less than or equal to 0.62x phi D, and phi D is the drilling hole diameter of the drill bit.

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