CN220679468U - Self-centering drill bit - Google Patents

Abstract

The utility model relates to a self-centering drill bit, which comprises a clamping handle; the end is connected with the clamping handle, a chip groove and a tip are arranged on the end, the tip is formed by protruding an end face of the end, the chip groove extends to the tip, a first main cutting edge is arranged at the joint of the end face and the chip groove, a second main cutting edge is arranged at the joint of the tip and the chip groove, the first main cutting edge is perpendicular to the axis of the end, and the diameter D1 of the end is three times the maximum diameter D2 of the tip; when the feeding direction of the drill bit is not perpendicular to the drilling surface, the first main cutting edge can avoid the radial reaction force from the part when cutting the part, and only receives the reaction force from the part along the axial direction of the end head, and the radial reaction force received by the second main cutting edge is small, so that the deviation occurs when the end head drills, and the consistency of the axis of a machining hole and the feeding direction of the drill bit is ensured.

Description

Self-centering drill bit

Technical Field

The utility model relates to the technical field of drill bits, in particular to a self-centering drill bit.

Background

The drill bit is generally used for drilling on a workpiece, the drilling precision requirement of a certain use environment is high, various drill bits used on a machine tool are commonly known as twist drills, straight flute drills and the like, the parallelism between the axis of a machining hole and the drilling direction cannot be guaranteed when the drill bit is drilled into a non-plane, and the drill bits such as indexable blade drill bits, flat bottom drills and the like are common, and the machining efficiency and the precision of the drill bits are low.

Disclosure of Invention

Therefore, the technical problem to be solved by the utility model is to overcome the prior art.

In order to solve the technical problems, the utility model provides a self-centering drill bit comprising

A clamping handle;

the end, it with the centre gripping handle is connected, the end is equipped with chip groove and top, the terminal surface protrusion of end forms top, the chip groove extends to top, the terminal surface with chip groove junction is equipped with first main cutting edge, top with chip groove junction is equipped with the second main cutting edge, wherein, first main cutting edge with the axis of end is perpendicular, the diameter D1 of end is three times of top maximum diameter D2.

In one embodiment of the utility model, a plurality of minor cutting edges are also included, the minor cutting edges being disposed at edges of the junk slots and extending along a length of the head.

In one embodiment of the utility model, the device further comprises a connector coaxially connected with the end head, wherein the diameter of the connector is larger than that of the end head, the connector is arranged between the end head and the clamping handle, and a first chamfer part is arranged between the end head and the connector.

In one embodiment of the utility model, a plurality of internal cooling through holes are provided, which penetrate through the clamping handle, the connecting head and the end head.

In one embodiment of the utility model, the head is further provided with a second chamfer portion, which is provided between the junk slots and the end face.

In one embodiment of the utility model, two junk slots are included, and both junk slots extend to the connector along the length of the tip.

In one embodiment of the utility model, the junk slots are provided with third chamfer portions at the parts of the connecting head.

In one embodiment of the utility model, the first main cutting edge and the second main cutting edge are distributed at the edges of the two junk slots.

In one embodiment of the utility model, the angle G1 of the tip is one hundred thirty degrees.

In one embodiment of the utility model, the axis of the outer wall of the tip, the tip coincides with the axis of the tip.

In one embodiment of the utility model, the chip grooves have a fan-shaped cross section.

In one embodiment of the utility model, the two junk slots are arranged symmetrically about the axis of the tip.

Compared with the prior art, the technical scheme of the utility model has the following advantages:

the self-centering drill bit comprises a clamping handle; the end is connected with the clamping handle, a chip groove and a tip are arranged on the end, the tip is formed by protruding an end face of the end, the chip groove extends to the tip, a first main cutting edge is arranged at the joint of the end face and the chip groove, a second main cutting edge is arranged at the joint of the tip and the chip groove, the first main cutting edge is perpendicular to the axis of the end, and the diameter D1 of the end is three times the maximum diameter D2 of the tip; when the feeding direction of the drill bit is not perpendicular to the drilling surface, the first main cutting edge can avoid the radial counter force from the part when cutting the part, and only the counter force from the part along the axial direction of the end head is received, and the counter force from the second main cutting edge is small, so that the radial counter force from the part received by the end head is close to zero, and the offset is insufficient when the end head drills, and the consistency of the axis of a machined hole and the feeding direction of the drill bit is ensured.

Drawings

In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof that are illustrated in the appended drawings, in which

FIG. 1 is a schematic view of a self-centering drill bit in accordance with a preferred embodiment of the present utility model.

Fig. 2 is a schematic diagram of a side view of the tip and connector of the self-centering drill bit of fig. 1.

Fig. 3 is a schematic view of a cross-sectional view of the self-centering drill bit shown in fig. 1.

Description of the specification reference numerals: 1. a clamping handle; 2. a connector; 3. a first chamfer portion; 4. an end head; 5. an end face; 6. a center; 7. a second chamfer portion; 8. a chip removal groove; 9. an internal cooling through hole; 10. a minor cutting edge; 11. a first main cutting edge; 12. an outer wall; 13. a third chamfer portion; 14. a second main cutting edge; d1, diameter of the end head; d2, diameter of the center; g1, angle of the center.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the utility model and practice it.

Examples

In one embodiment of the present utility model, and referring to FIGS. 1 and 2, a self-centering drill bit of the present utility model comprises

The clamping handle 1 is used for being connected with an external driving mechanism or being held by an operator, and the length of the clamping handle 1 along the axial direction of the clamping handle is larger than the sum of the lengths of the end head 4 and the connector 2.

The end socket 4 is fixedly connected with the clamping handle 1, the end socket 4 is provided with a chip groove 8 and a tip 6, the end face 5 of the end socket 4 protrudes to form the tip 6, and the tip 6 is in a conical structure; said chip grooves 8 extend to said tip 6 so that the chip grooves 8 expel chips, the tip 6 being used for drilling a centering hole; a first main cutting edge 11 is arranged at the joint of the end face 5 and the chip groove 8, and a second main cutting edge 14 is arranged at the joint of the center 6 and the chip groove 8, wherein the first main cutting edge 11 is perpendicular to the axis of the end head 4, so that the counterforce of the part on the first main cutting edge 11 is along the axis direction of the end head 4; the diameter D1 of the end head 4 is three times of the maximum diameter D2 of the center 6, and the center 6 is provided with a larger angle, so that the counter force of the part of the center 6 along the radial direction of the end head 4 is insufficient to offset the end head 4, and if the ratio of D1 to D2 is more than 3, the edge breakage is easy to occur; if the ratio of D1 to D2 is smaller than 3, the reaction force in the radial direction applied to the second cutting edge increases.

In one embodiment of the utility model, as shown with reference to fig. 1, further comprising a plurality of minor cutting edges 10, said minor cutting edges 10 being disposed at the edges of said junk slots 8, in particular the minor cutting edges 10 being located on the outer wall 12 of the head 4; and the minor cutting edge 10 extends in the length direction of the tip 4 so as to cut the entire machined hole; the secondary cutting edge 10 can reduce the roughness of the machined hole and improve the drilling accuracy.

In one embodiment of the present utility model, referring to fig. 2, the present utility model further includes a connector 2 coaxially connected to the end 4, the diameter of the connector 2 is larger than that of the end 4, the connector 2 is disposed between the end 4 and the clamping handle 1, a first chamfer portion 3 is disposed between the end 4 and the connector 2, and according to the hole depth and chamfer requirements of the machining hole required by the drawing, the angle and position of the first chamfer portion 3 can be set arbitrarily, so as to achieve the integration of drilling and chamfering.

In one embodiment of the utility model, as shown with reference to fig. 1 and 3, two internal cooling through holes 9 are provided, said internal cooling through holes 9 penetrating said grip handle 1, said connector 2 and said tip 4; the inner cooling through hole 9 is used for introducing cooling liquid into the processing hole, the cooling liquid can reduce the temperature of the end head 4, and chips can be carried out of the processing hole.

In one embodiment of the present utility model, referring to fig. 1, the end head 4 is further provided with a second chamfer 7, the second chamfer 7 is disposed between the chip groove 8 and the end surface 5, and the second chamfer 7 facilitates the chip generated by the first main cutting edge 11 and the second cutting edge to enter the chip groove 8, so as to avoid the chip blocking in the machining hole, and the main cutting edge is affected by the chip.

In one embodiment of the present utility model, referring to fig. 1, two junk slots 8 are included, and the two junk slots 8 extend to the connecting head 2 along the length direction of the end head 4, and the end of the connecting head 2 is located outside the machining hole, so that chips in the junk slots 8 are led out of the drill bit.

In one embodiment of the utility model, referring to fig. 1, the junk slot 8 is provided with a third chamfer 13 at the portion of the connecting head 2, and the third chamfer 13 is used for providing an inclined curved surface on the tail end of the junk slot 8, so that the chips can be smoothly discharged from the junk slot 8.

In one embodiment of the present utility model, referring to fig. 1, the first main cutting edge 11 and the second main cutting edge 14 are distributed at the edge portions of the two junk slots 8, and the main cutting edges of the two junk slots 8 are located on the same straight line, and the second main cutting edge 14 forms an angle G1.

In one embodiment of the present utility model, referring to fig. 2, the angle G1 of the center 6 is one hundred thirty degrees, specifically, G1 is between one hundred twenty eight degrees and one hundred thirty two degrees.

In one embodiment of the present utility model, referring to fig. 1, the axes of the outer wall 12 of the tip 4 and the tip 6 are coincident with the axis of the tip 4, so that the accuracy of drilling can be improved.

In one embodiment of the present utility model, referring to fig. 1, the chip flutes 8 have a fan-shaped cross section, preferably ninety degrees, which is advantageous for chip evacuation and for ensuring the strength of the tip 4.

In one embodiment of the present utility model, referring to fig. 1, the two junk slots 8 are symmetrically arranged with the axis of the end head 4 as the center, so that the main cutting edge is uniformly cut, the junk efficiency can be improved, and the drilling precision can be improved.

The working principle of the self-centering drill bit provided by the utility model is as follows:

when the drill bit drills into a non-plane surface such as a convex surface, a concave surface, an inclined surface and a curved surface, or the feeding direction is not perpendicular to the drilling surface, the first main cutting edge 11 only receives the counter force from the part along the axial direction of the end head 4 due to the fact that the force of the driving mechanism acts on the drill bit along the axial direction of the end head 4, the counter force from the part along the radial direction of the end head 4 can be avoided, the center 6 is smaller relative to the end head 4, the second main cutting edge 14 receives the counter force from the part along the radial direction of the end head 4 and approaches zero, and therefore the counter force from the part along the radial direction of the end head 4 approaches zero and is insufficient to offset the end head 4 during drilling, so that a machined hole is consistent with the feeding direction of the drill bit.

It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations and modifications of the present utility model will be apparent to those of ordinary skill in the art in light of the foregoing description. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present utility model.

Claims (10)

1. A self-centering drill bit, comprising

A clamping handle;

the end, it with the centre gripping handle is connected, the end is equipped with chip groove and top, the terminal surface protrusion of end forms top, the chip groove extends to top, the terminal surface with chip groove junction is equipped with first main cutting edge, top with chip groove junction is equipped with the second main cutting edge, wherein, first main cutting edge with the axis of end is perpendicular, the diameter D1 of end is three times of top maximum diameter D2.

2. The self-centering drill bit of claim 1, further comprising a plurality of minor cutting edges disposed on edges of the junk slots, the minor cutting edges extending along a length of the head.

3. The self-centering drill bit of claim 1, further comprising a connector coaxially coupled to the tip, the connector having a diameter greater than the diameter of the tip, the connector disposed between the tip and the grip, a first chamfer disposed between the tip and the connector.

4. A self-centering drill bit as claimed in claim 3, wherein a plurality of internally cooled through holes are provided, said internally cooled through holes extending through said clamping shank, said connector and said tip.

5. A self-centering drill bit as claimed in claim 3, wherein the tip is further provided with a second chamfer portion, the second chamfer portion being disposed between the junk slot and the face.

6. A self-centering drill bit as claimed in claim 3, comprising two flutes, each flute extending along the length of the head to the connection head.

7. A self-centering drill bit as claimed in claim 3, wherein the junk slots are provided with third chamfer portions at portions of the connecting head.

8. The self-centering drill bit of claim 6, wherein the first and second main cutting edges are distributed at edges of the two junk slots.

9. The self-centering drill bit of claim 1, wherein the angle G1 of the tip is one hundred thirty degrees.

10. The self-centering drill bit of claim 1, wherein the outer wall of the tip, the axis of the tip, and the axis of the tip are coincident.