CN215201024U

CN215201024U - Twist drill bit coping device

Info

Publication number: CN215201024U
Application number: CN202121231276.2U
Authority: CN
Inventors: 邢译壬; 邢凯旋; 祝恩民
Original assignee: Liaoning Yicheng Mechanical Equipment Co ltd
Current assignee: Liaoning Yicheng Mechanical Equipment Co ltd
Priority date: 2021-06-03
Filing date: 2021-06-03
Publication date: 2021-12-17
Anticipated expiration: 2031-06-03

Abstract

The utility model discloses a fluted drill coping ware, including the supporting rod that is used for being connected with electronic or pneumatic tool, locate the boss of the lower extreme of supporting rod and with the coping head that is used for revising fluted drill is connected to the boss, the terminal surface of coping head is equipped with the unthreaded hole, the unthreaded hole bottom is equipped with the circular cone hole, the front end of circular cone hole still is equipped with circular cone transition hole, the front portion in circular cone transition hole still is equipped with little round hole, little round hole passes through with circular cone transition hole mutually, the surface in circular cone hole is equipped with bellied coping sword, the coping sword extends to circular cone transition hole. The problem of the back angle of the twist drill that the manual work ground out is asymmetric is solved.

Description

Twist drill bit coping device

Technical Field

The utility model relates to a metal processing cutter grinding technical field, especially a fluted drill coping ware.

Background

Twist drill is often used in machine part processing technology field, realizes going up the round hole drilling to the part. The roundness of the drilled hole and the position of the drilled hole relative to the part depend on the back angle of the twist drill, which is currently ground manually, and the symmetry of the back angle determines the position of the drilled hole relative to the part, so that even after sharpening the back angle by an experienced technician, a slight error occurs.

SUMMERY OF THE UTILITY MODEL

The utility model discloses main the not enough in overcoming above-mentioned technique provides a fluted twist drill coping ware. The back angle of the twist drill which is ground manually is corrected to keep the symmetry of the twist drill, so that the defects in the technical problem are overcome.

In order to overcome the technical problem, the utility model discloses a technical scheme is: the grinding head comprises a clamping rod used for being connected with an electric or pneumatic tool, a boss arranged at the lower end of the clamping rod, and a grinding head connected with the boss and used for correcting the twist drill bit, wherein a unthreaded hole is formed in the end face of the grinding head, a conical hole is formed in the bottom of the unthreaded hole, a conical transition hole is further formed in the front end of the conical hole, a small round hole is further formed in the front part of the conical transition hole and penetrates through the conical transition hole, a raised grinding edge is arranged on the surface of the conical hole, and the grinding edge extends to the conical transition hole.

Compared with the prior art, the beneficial effects of the utility model are that: the symmetry of the twist drill after the back face angle is sharpened is consistent, the drilling precision of parts is improved, and the processing quality is improved.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Fig. 1 is a front view of the twist drill tip grinder of the present invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a bottom view of fig. 1.

Fig. 4 is a sectional view taken along line a-a of fig. 3.

Fig. 5 is a partially enlarged view of the region B shown in fig. 4.

Fig. 6 is a perspective view of the present invention, in which the internal structure is partially shown in a cross-sectional view.

Detailed Description

As shown in fig. 1 to 6, the twist drill tip dresser comprises a clamping rod 1 connected with an electric or pneumatic tool, a boss 2 arranged at the lower end of the clamping rod 1, and a tip dresser 3 connected with the boss 2 and used for dressing a twist drill, wherein a smooth hole 4 is arranged on the end surface of the tip dresser 3, a conical hole 5 is arranged at the bottom of the smooth hole, a conical transition hole 7 is further arranged at the front end of the conical hole 5, a small round hole 8 is further arranged at the front part of the conical transition hole 7, the small round hole 8 is communicated with the conical transition hole 7, a convex tip dresser 6 is arranged on the surface of the conical hole 5, and the tip dresser extends to the conical transition hole 7.

When the rear face angle of the twist drill is repaired by grinding, the clamping rod 1 is placed into the clamping part of an electric or pneumatic tool, the clamping rod 1 is clamped by the clamping part, the boss 2 at the lower end of the clamping rod 1 is attached to the end face of the clamping part of the electric or pneumatic tool, the twist drill is inserted into the grinding head 3 along the unthreaded hole 4 of the grinding head 3, the rear face angle of the twist drill is attached to the protruded grinding edge 6, and the rear face angle of the twist drill is centered through the conical transition hole 7, so that the chisel edge of the twist drill is hidden in the small round hole 8, and the abrasion of the chisel edge is prevented. The grinding head 3 is driven to rotate by the rotation of an electric or pneumatic tool, so that the rear corners of the twist drill are ground and corrected by the grinding edge 6, the symmetry of the rear corners on two sides of the chisel edge of the twist drill is consistent, the powder ground by the twist drill falls into the surface of the conical hole 5 and slides into the unthreaded hole 4 through the conical surface, and the powder is discharged out of the grinding head 3 through the unthreaded hole 4.

Furthermore, the diameter of the unthreaded hole 4 is larger than that of the conical hole 5 at the bottom of the unthreaded hole 4, so that a certain distance is generated between the unthreaded hole 4 and the diameter of the twist drill, and the twist drill is prevented from drilling the unthreaded hole 4; when the rear face angle of the twist drill bit is polished, the unthreaded hole 4 can better dissipate heat generated by polishing work.

Furthermore, the trimming blades 6 are uniformly distributed on the surfaces of the conical hole 5 and the conical transition hole 7 in an array manner, so that the rear corner of the twist drill can be trimmed in all directions, and the cross blade of the twist drill enters the small circular hole 8 for protection through the conical transition hole 7 after being trimmed.

Furthermore, the number of the sharpening blades 6 is at least 2, and the sharpening effect can be achieved due to the arrangement of one sharpening blade 6, but under the action of high-speed rotation of an electric or pneumatic tool, strong impact force and centrifugal eccentric force can be generated on the single sharpening blade 6, so that the abrasion of the sharpening blade 6 can be accelerated; secondly, research and development practice also verifies that the grinding quality of the back corners of the twist drill bits is influenced by the single grinding edge 6, and due to the action of impact force and eccentric force, the grinded back corners generate obvious tool marks, so that one grinding edge 6 is not suitable for grinding and correcting the twist drill bits.

Further, in order to enable the clamping bar 1 to be connected and exchanged with an existing electric or pneumatic tool, the cross-sectional shape of the clamping bar 1 is any one of a square shape and a circular shape.

Furthermore, a chamfer 9 is arranged at the unthreaded hole on the end face of the grinding head 3, and the chamfer 9 is favorable for discharging the powder ground by the twist drill.

The present invention is not limited to the precise arrangements described above and shown in the drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. The utility model provides a fluted drill coping ware, is including being used for supporting rod (1) be connected with electronic or pneumatic tool, locate boss (2) of the lower extreme of supporting rod (1) and with boss (2) are connected and are used for revising fluted drill's grinding head (3), its characterized in that: the end face of the grinding head (3) is provided with a unthreaded hole (4), the bottom of the unthreaded hole is provided with a conical hole (5), the front end of the conical hole (5) is further provided with a conical transition hole (7), the front part of the conical transition hole (7) is further provided with a small round hole (8), the small round hole (8) and the conical transition hole (7) penetrate through each other, the surface of the conical hole (5) is provided with a convex grinding edge (6), and the grinding edge extends to the conical transition hole (7).

2. A twist drill tip sharpener according to claim 1, wherein: the diameter of the light hole (4) is larger than that of the conical hole (5) at the bottom of the light hole (4).

3. A twist drill tip sharpener according to claim 1, wherein: the sharpening blades (6) are uniformly distributed on the surfaces of the conical hole (5) and the conical transition hole (7) in an array manner.

4. A twist drill tip sharpener according to claim 3 wherein: the number of the sharpening edges (6) is at least 2.

5. A twist drill tip sharpener according to claim 1, wherein: the cross section of the clamping rod (1) is in any one of a square shape or a circular shape.

6. A twist drill tip sharpener according to claim 1, wherein: and a chamfer (9) is arranged at the unthreaded hole on the end surface of the grinding head (3).