CN218277312U - Groove drill - Google Patents

Abstract

The utility model discloses a fluted drill, including drill bit body and connection the stalk portion of drill bit body, drill bit body front end sets up two main back knife face and two pairs of back knife faces, still be equipped with two chip grooves that are helical structure on the drill bit body, two between the chip groove the drill bit body is interior to be formed and to avoid the vacancy, keep away vacancy and one of them crossing formation all sword between the chip groove, avoid vacancy and another be in between the chip groove drill bit body circumference forms the margin, main back knife face with the crossing main cutting edge that forms of chip groove, the radial diameter of all sword is less than the radial diameter of margin. The groove drill can ensure that the processing hole pattern of the groove hole is excellent and the hole diameter precision is good.

Description

Groove drill

Technical Field

The utility model relates to a processing cutter technical field especially relates to a fluted drill.

Background

Printed circuit boards are important electronic components, support bodies for electronic components, and carriers for electrical connection of electronic components. In the process of manufacturing the printed circuit board, a slot drill is used to grind, drill, etc. the printed circuit board. The conventional common fluted drill is generally provided with a circumferential cutting edge 100 (shown in figures 1-2), the structure of the conventional fluted drill is similar to that of a common twist drill, and the circumferential cutting edge 100 can play a supporting role in the drilling process so as to ensure the hole position precision of hole machining; however, the peripheral edge of the edge band structure has no cutting function, the part of the fluted drill usually used for machining is not a complete round hole, the cutter is not uniformly stressed in the drilling process, and the problem of poor hole pattern is easily caused. If a milling cutter peripheral edge structure fluted drill (as shown in fig. 3-4) is adopted and comprises a peripheral edge 200, the peripheral edge 200 has a cutting function in the slotted hole machining process, the hole pattern machined by the slotted hole is good, but the support effect of a blade zone is not available in the drilling process, so that the hole position precision of hole machining is difficult to ensure, and the machined hole diameter has the phenomenon of over-precision.

Therefore, there is a need to develop a slot drill that can ensure both good hole pattern and good hole diameter precision to solve the above technical drawbacks.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can guarantee not only that the slotted hole processing pass is good but also can guarantee the groove drill that the aperture precision is good.

In order to achieve the purpose, the utility model provides a fluted drill, including drill bit body and connection the stalk portion of drill bit body, drill bit body front end sets up two main back knife face and two pairs of back knife faces, still be equipped with two chip grooves that are helical structure on the drill bit body, two between the chip groove the drill bit body indent forms and keeps away the vacancy, keep away vacancy and one of them crossing formation week sword between the chip groove, keep away vacancy and another be in between the chip groove drill bit body circumference forms the margin, main back knife face with the crossing formation main cutting edge of chip groove, the radial diameter of week sword is less than the radial diameter of margin.

Compared with the prior art, the utility model discloses a fluted drill is at this fluted drill drilling in-process, the drill point contacts the work piece at first, the extrusion work piece cuts until main cutting edge, the chip groove is arranged in the discharge of cutting in the course of working, continue the drilling in-process, owing to be equipped with all sword and land, and the radial diameter of all sword is less than the radial diameter of land, all sword can mend the sword to downthehole cutting, as the finish machining, guarantee aperture precision and improve the smoothness, the land simultaneously, the hole site precision and the pass of assurance spot facing work. Therefore, the groove drill can realize the advantages of excellent groove hole processing hole pattern and excellent hole diameter precision. In addition, the clearance avoiding position is arranged, so that the friction of the main cutting edge can be reduced, the chip containing space is increased, and the processing precision is improved.

Preferably, the radial diameter of the peripheral edge is 90-98% of the radial diameter of the land.

Preferably, a chisel edge is disposed between the two main cutting edges.

Preferably, the clearance-avoiding position has a clearance-avoiding surface, and the blade zone and the clearance-avoiding surface intersect to form a side edge.

Preferably, the helical angle of the chip grooves is 25-40 degrees.

Preferably, the central angle of the margin is 3-20 °.

Preferably, the central angle of the vacancy avoidance position is 30-90 degrees.

Preferably, the central angle of the vacancy avoidance position is 70-80 degrees.

Drawings

Fig. 1 is a side view of a conventional prior art slot drill.

Fig. 2 is a plan view of the general slot drill shown in fig. 1.

Fig. 3 is a side view of a prior art milling cutter peripheral edge structure fluted drill.

Fig. 4 is a top view of the fluted drill of the peripheral edge structure of the milling cutter shown in fig. 3.

Fig. 5 is a perspective view of the slot drill of the present invention.

Fig. 6 is a side view of the slot drill of fig. 5.

Fig. 7 is a side view of the slot drill of fig. 5 at another angle.

Fig. 8 is a top view of the bit body of the slot drill shown in fig. 5.

Fig. 9 is the same as fig. 8, and is used to mark the central angle α of the margin and the central angle γ of the relief.

Description of the symbols

The drill bit comprises a drill bit body 10, a main rear tool face 11, a secondary rear tool face 12, a chip groove 13, a vacancy avoiding 14, a vacancy avoiding face 141, a peripheral edge 15, a cutting edge 16, a main cutting edge 17, a chisel edge 18, a side edge 19, a drill tip 20, a shank 30 and a transition part 40.

Detailed Description

In order to explain technical contents, structural features, and effects achieved by the present invention in detail, the following description is given in conjunction with the embodiments and the accompanying drawings.

As shown in fig. 5-8, the utility model provides a fluted drill, including drill body 10 and connection the stalk portion 30 of drill body 10, drill body 10 front end sets up two main back knife face 11 and two pairs of back knife face 12, still be equipped with two chip grooves 13 that are helical structure on the drill body 10, two between the chip groove 13 drill body 10 indent forms the vacancy avoiding portion 14, the vacancy avoiding portion 14 with one of them it intersects between the chip groove 13 and forms all sword 15, avoid vacancy 14 and the other between the chip groove 13 drill body 10 circumference forms the land 16, main back knife face 11 with chip groove 13 intersects and forms main cutting edge 17, the radial diameter D1 of all sword 15 is less than the radial diameter D2 of land 16.

In the technical scheme, in the drilling process of the groove drill, the drill tip 20 firstly contacts with a workpiece, the workpiece is extruded until the main cutting edge 17 cuts, the chip discharge groove 13 is used for discharging the cut in the machining process, and in the continuous drilling process, as the circumferential edge 15 and the land 16 are arranged, the radial diameter D1 of the circumferential edge 15 is smaller than the radial diameter D2 of the land 16, the circumferential edge 15 can perform cutter supplementing on the cut in a hole to be used as finish machining, the hole diameter precision is ensured, the smoothness is improved, and meanwhile, the land 16 has a supporting function, and the hole site precision and the hole pattern of hole machining are ensured. Therefore, the groove drill can realize the advantages of excellent groove hole processing hole pattern and excellent hole diameter precision. In addition, the clearance avoiding position 14 is arranged, so that the friction of the main cutting edge 17 can be reduced, and the chip containing space and the processing precision can be improved.

Referring to fig. 6 to 7, the drill body 10 is a portion that contacts a workpiece, the drill tip 20 is disposed at the front end of the drill body 10, the rear end of the drill body 10 is connected to the shank 30, and the shank 30 is a portion designed to correspond to the shape of the spindle of the machine tool, which is not limited herein. The bit body 10 and the shank 30 are integrally formed or welded together. The drill body 10 and the handle part 30 are integrally formed, so that the service life of the fluted drill can be prolonged, the drill body 10 and the handle part 30 are fixedly connected in a welding mode, the recycled waste fluted drill can be fully utilized and used as the handle part 30, and the cost is reduced. In a preferred embodiment, a transition portion 40 may be disposed between the bit body 10 and the shank portion 30, the transition portion 40 having a diameter that decreases in a direction from the shank portion 30 toward the bit body 10.

Referring to fig. 6 to 7, two chip flutes 13 are spirally formed on the circumferential surface of the drill body 10 for discharging chips of the main cutting edge 17, and the two chip flutes 13 are symmetrically formed about the central axis of the drill body 10. Further, the helix angle of the junk slots 13 is 25 ° to 40 °, for example, the helix angle of the junk slots 13 may be, but is not limited to, 25 °, 28 °, 31 °, 33 °, 37 °, 40 °.

Referring to fig. 8, the radial diameter D1 of the circumferential edge 15 refers to the diameter of a circle formed by rotating any point on the circumferential edge 15 around the central axis of the drill body 10. The radial diameter D2 of the margin 16 refers to the distance between any two points on the margin 16 on either side. The radial diameter D1 of the peripheral edge 15 is 90% to 98% of the radial diameter D2 of the land 16, the land 16 corresponds to a reamer action, and the hole diameter accuracy can be effectively ensured, for example, D1=90% of the diameter D2, D1=91% of the diameter D2, D1=92% of the diameter D2, D1=93% of the diameter D2, D1=94% of the diameter D2, D1=95% of the diameter D2, D1=96% of the diameter D2, D1=97% of the diameter D2, D1=98% of the diameter D2, but not limited thereto.

Referring to fig. 5, the margin 16 is disposed on the circumferential surface of the bit body 10 in a spiral structure between the chip groove 13 and the clearance 14, and the margin 16 provides a supporting function. Further, referring to fig. 9, the central angle α of the margin 16 is 3 ° to 20 °, such as 3 °, 6 °, 9 °, 12 °, 15 °, 18 °, and 20 °. It should be noted that the central angle α of the margin 16 is an angle formed by connecting both ends of the margin 16 to the central axis of the drill body 10, and the angle is not suitable for expanding, otherwise, the friction between the fluted drill and the hole wall is increased.

Referring to fig. 8, a chisel edge 18 is disposed between the two main cutting edges 17, and the chisel edge 18 is used to ensure the stability of the drilling hole of the slot drill. Further, the clearance space 14 has a clearance surface 141, and it can be understood that the concave surface in the drill body 10 is the clearance surface 141. Preferably, the clearance surface 141 is a cambered surface, that is, the concave cambered surface is the clearance surface 141. The cutting edge 16 and the clearance surface 141 are intersected to form a side edge 19, the main cutting edge 17 finishes cutting a rough part, the peripheral edge 15 controls the rough machining aperture, the side edge 19 finishes finishing the aperture, and the side edge 19 finishes finishing the aperture. Further, referring to fig. 9, two end points of the clearance space 14 are respectively connected to the central axis of the drill body 10 to form a central angle γ of the clearance space 14, where the central angle γ is 30 ° -90 °, for example, the central angle γ may be, but is not limited to, 30 °, 40 °, 50 °, 60 °, 70 °, 80 °, and 90 °. Preferably, the central angle γ of the evacuation point 14 is 70 ° to 80 °.

The above disclosure is only a preferred embodiment of the present invention, and the function is to facilitate the understanding and the implementation of the present invention, which of course should not be limited by the scope of the claims of the present invention, and therefore the scope of the present invention is covered by the claims of the present invention.

Claims (8)

1. The utility model provides a fluted drill, includes the drill bit body and connects the stalk portion of drill bit body, a serial communication port, drill bit body front end sets up two main back knife faces and two pairs of back knife faces, still be equipped with two chip grooves that are helical structure on the drill bit body, two between the chip groove the drill bit body indent forms and keeps away the vacancy, keep away the vacancy and one of them crossing formation week sword between the chip groove, keep away vacancy and another be in between the chip groove drill bit body circumference forms the margin, main back knife face with the crossing formation main cutting edge of chip groove, the radial diameter of week sword is less than the radial diameter of margin.

2. A slot drill according to claim 1, wherein the radial diameter of the peripheral edge is 90-98% of the radial diameter of the land.

3. A slot drill according to claim 1, characterized in that a chisel edge is provided between the two main cutting edges.

4. The slot drill of claim 1, wherein the clearance space has a clearance surface, the land intersecting the clearance surface to form a side edge.

5. A fluted drill according to claim 1, wherein the helix angle of the flutes is between 25 ° and 40 °.

6. A slot drill according to claim 1, characterized in that the central angle of the margin is 3 ° -20 °.

7. A slot drill according to claim 1, characterized in that the central angle of the void avoidance space is 30 ° -90 °.

8. A slot drill according to claim 7, characterized in that the central angle of the void avoidance space is 70 ° -80 °.

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