DE102012000245A1 - A drill bit insert, a drilling tool, and a method of assembling it - Google Patents

Abstract

The present disclosure relates to a drilling tool, in particular a trigonal-shaped drill bit with a plurality of cutting edges. The trigonal-shaped drill insert (1) comprises an upper side (1b) and an underside (1c) which are parallel to one another, characterized by a fastening hole (1a) in the center of the drill insert (1), whereby the indexable insert (1) both rests on the top (1b) and on the underside (1c) of the cutting plate (1), and a plurality of cutting edges (1d) on each side of the cutting plate (1).

Description

The following description sets forth in particular the nature of the invention and the manner in which it is to be implemented.

TECHNICAL AREA

Embodiments of the present disclosure relate to a drilling tool. In particular, the embodiments relate to a trimming cutter bit having a plurality of cutting edges.

GENERAL PRIOR ART

Drilling tools typically employ inserts for the drilling operation. The existing inserts used in the drilling tools are trigonal inserts and have three cutting edges. After using the inserts for a certain period of time, the cutting edges wear out. Therefore, the inserts must be turned and then, after old 6 cutting edges are worn, replaced with new inserts.

In rotary taps with normal mounting of the inserts, the threads of the inserts are engaged with the screw. The screw in the drill has about 1.5 to 2 threads, since the amount of material for a core hole in the drill body is reduced.

In view of the above, there is a need for a drill bit cutting plate having more than one cutting edge to overcome the limitation.

EXPLANATION OF THE REVELATION

Accordingly, the present disclosure provides a drill bit with a trigonal shape comprising a top and a bottom parallel to each other, characterized by a mounting hole in the center of the drill bit, whereby the insert is mountable on both the top and bottom sides, and a plurality of cutting edges on each side of the insert, and it relates to a boring tool comprising a drill bit of trigonal shape comprising a top and a bottom parallel to each other, characterized by a mounting hole in the center of the bit, thereby forming the insert is mountable on both the top and bottom of the insert, and includes a plurality of cutting edges on each side of the insert, and a drill body having drill bits and drill bits at the coil end, wherein the bits are configured to and to provide a method of assembling the drilling tool which includes mounting the drill bit inserts tangentially in drill bits of the drilling tool and attaching the drill bit inserts to the drilling tool using screws.

SHORT DESCRIPTION OF THE REVELATION

The deficiencies of the prior art are overcome by the provision of a drill bit as claimed in the present disclosure, and other advantages are provided. Further features and advantages are realized by the techniques of the present invention. Other embodiments and aspects of the disclosure are described in detail herein and are considered part of the claimed disclosure.

In one embodiment, the disclosure provides a drill bit of trigonal shape comprising a top and a bottom parallel to each other, characterized by a mounting hole in the center of the drill bit, whereby the insert is mountable on both the top and bottom of the bit and a plurality of cutting edges on each side of the insert.

In one embodiment, the drill cutting insert comprises six cutting edges and has an included angle between adjacent cutting edges which ranges from about 70 ° to about 90 ° and an angle between two parts of the same cutting edge in the range of about 140 ° to about 180 ° ,

In one embodiment, the angle between the top and a rake face is in a range of about 50 ° to about 90 °.

In one embodiment, the top and the bottom each have three cutting edges.

In one embodiment, a drilling tool comprises a drill bit of trigonal shape comprising a top and a bottom parallel to one another, characterized by a mounting hole in the center of the drill bit, whereby the insert is mountable on both the top and bottom surfaces, and a plurality of cutting edges on each side of the insert, and a drill bit body having drill bits and drill bits at the coil end, the bit pockets facing thereto configured to receive the drill bit inserts, wherein the drill bit inserts are mounted tangentially in the drill bits.

In one embodiment, the drill cutting insert includes six cutting edges and has an enclosing angle in the range of about 70 ° to about 90 ° and an angle between two parts of the same cutting edge in the range of about 140 ° to about 180 °.

In one embodiment, the top and bottom of the drill bit cutting plate each have three cutting edges.

In one embodiment, the disclosure provides a method of assembling the drilling tool that includes mounting the drill bit inserts tangentially in drill bits of the drilling tool and attaching the drill bit inserts to the drilling tool using screws.

In one embodiment, the drill cutting plates are mounted in such a manner that the axis of the screw is substantially parallel to the axis of the drilling tool.

The foregoing summary is illustrative only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, other aspects, embodiments, and features will become apparent by reference to the figures and the following detailed description.

BRIEF DESCRIPTION OF THE ATTACHED FIGURES

The features of the present disclosure will become more fully apparent from the following description and the appended claims, taken in conjunction with the accompanying drawings. It will be understood that these figures represent only a few embodiments in accordance with the disclosure and are therefore not to be considered as limiting the scope of the invention; The disclosure will be described with additional details and details by reference to the attached figures.

1 shows a plan view of the drill bit according to the disclosure;

2 shows a side view of the drill bit according to the disclosure;

3 shows a perspective view of the drill bit according to the disclosure;

4a . 4b . 4c show a drilling tool with inserts according to the disclosure;

5a and 5b 12 show perspective views of an assembled drill bit with the drill body in accordance with the disclosure;

6a and 6b FIGS. 4 each show perspective views of the assembled drill bit insert with the drill bit body according to the disclosure;

7 shows the drilling tool with attachment means parallel to Bohrwerkzeugachse according to the disclosure;

8th FIG. 12 is a bottom view of the drilling tool with tangentially mounted trigonal shaped drill bits according to the disclosure; FIG. and

9 shows footprints in the pocket according to the present disclosure.

DETAILED DESCRIPTION

In the following detailed description, reference is made to the accompanying figures, which form a part hereof. In the figures, like symbols usually designate like components unless the context requires otherwise. The illustrative embodiments are described in the detailed description and in the figures. Other embodiments may be used and other changes may be made without departing from the spirit or scope of the subject matter presented herein. It should be understood that the aspects of the present disclosure, as generally described herein and illustrated in the figures, are arranged, replaced, combined, and constructed in a variety of different configurations, all of which are expressly contemplated and forms a part of this disclosure can.

This disclosure relates inter alia to a drill bit. In particular, the embodiment of the disclosure relates to trigthorne drill bits.

With reference to the 1 - 9 For example, a double-sided or drill bit insert in accordance with the present disclosure is shown. The cutting plate is of trigonal shape, which is made of directly pressed carbide.

In one embodiment show 1 . 2 and 3 in each case a view of a trigonal drill cutting plate from above, from the side or in perspective. The insert is essentially trigonal; each side of the triangle is folded outward from the center of the triangle to form two sides on each side of the triangle. Consequently, the insert has six corners, with the apex angles of the triangle being dull. Another way of describing a trigonal drill bit is that an imaginary circle inscribed in the drill bit contacts the periphery of the drill bit in six points. Thus, the drill bit has six sides S1, S2, S3, S4, S5, S6, each of which includes a main cutting edge, H1, H2, H3, H4, H5, H6. The three main cutting edges H2, H4, H6 are in 1 shown in direct relation to a top, while the other three main cutting edges H1, H3, H5 are on the lower side of the drill bit. For mounting the drill bit in a drill bit pocket ( 5 ) is a mounting hole ( 1a ), including its axis, centrally in the drill bit cutting plate ( 1 ) intended.

For example, in one embodiment, the included angle (α) of the cutting edges ranges from about 70 ° to about 90 °, while the angle (β) between the same cutting edge portions of the same side ranges from about 140 ° to about 180 °. The included angle (θ) between adjacent cutting edges ranges from about 50 ° to about 90 °. The insert is a negative insert and has no clearance angle above the cutting edges. This allows for three turns of the insert when clamped on one side and another three times when clamped on the other side. The contact surfaces are pressed against the pocket walls in the steel drill body. The rake angle and the included angle across the cutting edge are complementary. If the rake angle is 13 °, then the included angle (α) is 77 °. If the rake angle is 15 °, then the included angle (α) is 75 °. The drill bit has a rake range represented by R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and R12.

In one embodiment, the trigonal inserts are much stronger than triangular inserts because their included angle (α) is greater in comparison (80 ° for trigonal to 60 ° for triangular embodiment). Since the cutting plates are present without clearance angle over the cutting edge, twice the number of cutting edges can be provided compared to a positive cutting plate (cutting plate with clearance angle above the cutting edge). Since it is a negative insert, the clearance is also changed with regard to the positioning of the insert in the drill, and consequently also the pitch angle.

In one embodiment show 4a - 4c a perspective view and side views of the drilling tool according to the disclosure. The drill body ( 2 ) is equipped with two cutting board pockets ( 5 ), each of which has two contact surfaces ( 9 ) against which a drill bit ( 1 ) is arranged to pass through a screw ( 6 ) to be mounted. The screw ( 6 ) is through the mounting hole ( 1a ) of the drill cutting plate ( 1 ) into a threaded mounting hole ( 7 ) in the drill cutting board pockets ( 5 ) of the drill body ( 8th screwed in).

In one embodiment 5a and 5b perspective views of the assembled drill bit ( 1 ) with the drill body ( 3 ) according to the disclosure. 6a and 6b show perspective views of the assembly of the drill bit with the drill body according to the disclosure.

In one embodiment, the drill body ( 3 ), which is made of steel, built on similar drilling dynamics as the Top Cut Plus drill or Drill Fix Trine (DFT) / Drill Fix Square (DFS). The cutting end portion of the drill carries two of the inserts discussed above. The inserts are mounted tangentially. The inner insert and the outer insert are positioned so that the drill forms a "cone" angle, but not necessarily the angles formed by the positioning of the two inserts are the same. The inserts are positioned so that the axes of the inserts are substantially parallel to the drill axis, but with small angular orientations. These small angular orientations are intended to replace all other free and pitch angles such as cone angle, rake angle (axial span and radial chip), etc. Therefore, there will also be a small amount of misalignment between the axis of the insert screws and the axis of the drill body.

The helix pitch angle ranges from about 10 ° to about 30 °. This is mainly the case to promote free and easy chip removal to the right of the cutting edge of the tip tips to the back end of the drill along the helixes.

In one embodiment shows 7 the drilling tool with attachment means parallel to Bohrwerkzeugachse according to the disclosure. The fastening means ( 6 ) [Screws] are in the drill cutting plate ( 1 ) used to drill body ( 3 ) to be attached. The axis of the screw is substantially parallel to the axis of the drill body.

In one embodiment shows 8th an end view of the drill, which illustrates the tangential mounting of the trigonal inserts. A tangential mounting requires that the screws are mounted substantially parallel to the drill axis ( ). There is enough material for a core hole in the drill body and thus screws of greater length can be used. This allows at least the engagement of two or three complete threads in the thread in the drill body. Therefore, the seat is more stable in the case of tangential mounting. Since the contact surfaces are larger in the axial direction, the transmission of the axial component of the cutting forces is more effective.

In one embodiment, the present disclosure provides a method of turning. The method includes unscrewing the insert from the drill bits, rotating the inserts about the mounting hole of the insert so that the adjacent surfaces make contact with the pocket as with the original surfaces, and re-tightening the inserts on the bit body. After all three cutting edges have been consumed on one side of the cutting insert, the cutting insert is unscrewed and turned over so that the other side contacts the pocket wall and tightened again, and consequently the three cutting edges on the other faces are also used.

In one embodiment shows 9 Footprints in the pocket according to the present disclosure. The contour of the footprint provides better grip for the drill bits. The chips are after drilling through the Spanspaltbereich ( 8th ) and discharged through the helical coil.

Equivalent embodiments:

With respect to the use of substantially all plural and / or singular terms herein, those skilled in the art can change from plural to singular and / or singular to plural, as may be the context and / or the particular context Application is appropriate. The various singular / plural interchanges can be explicitly defined here for reasons of clarity.

It will be apparent to those skilled in the art that, generally, the terms used herein and more particularly in the appended claims (eg, the entirety of the appended claims) should be construed as "open" terms (eg, the term "including") be construed as including, but not limited to, the term "including" as "having at least", the term "comprising" should be construed as "including, but not limited to," construing, etc.). It will be further understood by those skilled in the art that where a certain number is enumerated in an established claim, such intention is expressly stated in the claim and, in the absence of such designation, there is no such intention. For example, as an aid to understanding, the following appended claims may include the use of the introductory phrases "at least one" and "one or more" to initiate the enumeration. However, the use of such sentences should not be construed as limiting the initiation of enumeration in a claim by the indefinite article "a" or "an" to a particular claim containing such preliminary claim payment as to inventions containing only such enumeration Even if the same claim the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an" (eg "a" and / or "an" should generally be in the sense of "At least one" or "one or more" are interpreted) comprises; the same applies to the use of certain items that are used to initiate claim enumeration. In addition, even if a certain number of claimed claims are expressly put forward, those skilled in the art will recognize that such enumeration is generally to be interpreted as at least the number listed (eg, the mere mention of "two quoted") Characteristics "without other modifiers usually means at least two of the listed features or two or more cited features). Moreover, in cases where an analogous convention is used to "at least one of A, B, and C, etc.," such a construction will generally be used in the sense that one skilled in the art would understand the convention (e.g. "A system with A, B and / or C" would include but not be limited to systems which include A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B and C together, etc.). In those cases where an analogous convention to "A, B and / or C, etc." is used, such a construction is generally used in the sense that one skilled in the art would understand the convention (eg, "a system A, B and / or C "would include, but are not limited to, A, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B and C together, etc.). It will be further understood by those skilled in the art that virtually every word and / or phrase that presents two or more alternative terms, whether in the specification, claims, or figures, will be understood should be that it contains the possibilities of including one of the terms, each of the terms, or both. For example, the sentence "A or B" is understood to include the possibilities "A" or "B" or "A and B".

While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for the purpose of illustration and are not to be considered as limiting, the true scope and spirit being indicated by the following claims.

LIST OF REFERENCE NUMBERS

1

Drill insert,

1a

Mounting hole of the drill bit,

1b

Top of the drill bit,

1c

Underside of the drill bit,

1d

Cutting edges of the drill bit,

1e

Contact surfaces of the drill bit,

2

drilling tool

3

Drill body,

4

Drill helix,

5

Drill cutting insert pockets,

6

Screw,

7

Screw hole in the cutting board pocket,

8th

Chip removal gap area on the helix,

α

included angle between the top (1b) and the rake face,

β

included angle between two parts of the same cutting edge,

θ

included angle between adjacent cutting edges,

S1, S2, S3, S4, S5 and S6

Sides on the drill bit,

H1, H3 and H5

Cutting edges of the drill cutting plate on the underside of the drill bit,

H2, H4 and H6

Cutting edges of the drill bit on the top of the drill bit and

 R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11 and R12

Span section of drill bit.

Claims (9)

Drill bit insert ( 1 ) having a trigonal shape, comprising: a top side ( 1b ) and a bottom ( 1c ) which are parallel to each other, characterized by a mounting hole ( 1a ) in the middle of the drill cutting plate ( 1 ), whereby the indexable insert ( 1 ) both on the top ( 1b ) as well as on the underside ( 1c ) of the cutting plate ( 1 ) is mountable, and a plurality of cutting edges ( 1d ) on each side of the insert ( 1 ). Drill bit insert ( 1 ) according to claim 1, wherein the cutting plate ( 1 ) comprises six cutting edges and has an included angle between adjacent cutting edges which is in a range of about 70 ° to about 90 ° and an angle between two parts of the same cutting edge in the range of about 140 ° to about 180 °. Drill bit insert ( 1 ) according to claim 1, wherein the angle between the top ( 1b ) and a rake face is in a range of about 50 ° to about 90 °. Drill bit insert ( 1 ) according to claim 1, wherein the top side ( 1b ) and the underside ( 1c ) each three cutting edges ( 1d ) exhibit. Drilling tool ( 2 ), comprising: a drill bit ( 1 ) having a trigonal shape, comprising an upper side ( 1b ) and a bottom ( 1c ) which are parallel to each other, characterized by a mounting hole ( 1a ) in the middle of the drill cutting plate ( 1 ), whereby the cutting plate ( 1 ) both on the top ( 1b ) as well as on the underside ( 1c ) of the cutting plate ( 1 ) is mountable, and a plurality of cutting edges ( 1d ) on each side of the insert ( 1 ), and a drill body ( 3 ) with drill bits ( 4 ) and drill bags ( 5 ) at the end of the coil, whereby the drill bags ( 5 ) to configure the drill bits ( 1 ), the drill inserts ( 1 ) tangentially in the drill pockets ( 5 ) are mounted. Drilling tool ( 2 ) according to claim 5, wherein the drill bit ( 1 ) includes six cutting edges and has an included angle in the range of about 70 ° to about 90 ° and an angle between two parts of the same cutting edge in the range of about 140 ° to about 180 °. Drilling tool according to claim 5, wherein the upper side ( 1a ) and the underside ( 1c ) of the drill cutting plate ( 1 ) each three cutting edges ( 1d ) exhibit. Method for assembling the drilling tool ( 2 ), comprising: mounting the drill bit inserts ( 1 ) tangentially in drill bags ( 5 ) of the drilling tool ( 2 ), and attachment of the drill inserts ( 1 ) on the drilling tool ( 2 ) using screws ( 6 ). Method according to claim 8, wherein the drill cutting plates ( 1 ) are mounted in such a way that the axis of the screw ( 6 ) substantially parallel to the axis of the drilling tool ( 2 ).

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