CN214293810U

CN214293810U - Tail end expansion piece drill bit

Info

Publication number: CN214293810U
Application number: CN202020805682.4U
Authority: CN
Inventors: 王秀秀
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2021-09-28
Anticipated expiration: 2030-05-15

Abstract

The utility model provides a terminal inflation piece drill bit, belongs to processing tool technical field, includes drilling rod, cutting head, the drilling rod top is equipped with the cutting head mounting groove, the cutting head mounting groove with deposit cut the groove and lead and cut the groove intercommunication, the cutting head is the polygon, and its cutting edge is located the open end of cutting head mounting groove, the side initial surface becomes 90 with lower initial surface, and the side terminal surface becomes 90 with lower terminal surface. The utility model discloses terminal inflation piece drill bit can drill out inside and has a reaming mounting hole, construction convenience.

Description

Tail end expansion piece drill bit

Technical Field

The utility model belongs to the technical field of the machining tool, concretely relates to terminal inflation piece drill bit.

Background

The tail end expansion piece is a part commonly used in installation engineering, the tail end expands after being fastened, two objects are connected together by being tightly attached to the hole wall, but in the environment with large temperature difference, such as winter and summer in the north, the connection is often disabled under the influence of expansion caused by heat and contraction caused by cold, no matter how tight the tail end expansion piece is screwed, the tail end expansion piece is expanded in the hole in summer after burning heat, the hole is expanded, the diameter of the tail end expansion piece is reduced due to cold in winter, the brick wall, concrete and stones are small in expansion coefficient, the reduction ratio of the hole is small, at the moment, the tail end expansion piece is in loose connection and fails, and sometimes the tail end expansion piece is dangerous, such as an air conditioner hung on an outer wall.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a terminal inflation piece drill bit enlarges the terminal diameter in hole, makes terminal inflation piece card in such hole, surpasss the expend with heat and contract with cold's of screw scope, realizes the purpose of fastening.

The utility model adopts the following technical scheme:

a tail expansion piece drill comprises a drill rod and a cutting head, wherein the top of the drill rod is provided with a cutting head installation groove, the cutting head installation groove is L-shaped, the other end of the drill rod is an open end, the side wall of the cutting head installation groove is provided with a cutting head fixing hole, the lower part of the cutting head installation groove, which is positioned at the open end, is provided with a cutting guide groove, the lower part of the cutting head installation groove is provided with a cutting head storage groove, the cutting head installation groove is communicated with the cutting guide groove through the cutting guide groove, the middle part of the cutting head is provided with a cutting head center hole, the cutting head fixing hole is connected with the cutting head center hole through a cutter shaft, the cutting head is polygonal, the cutting edge of the cutting head installation groove is positioned at the open end of the cutting head installation groove, the opposite side edge and the lower side edge of the cutting edge are respectively provided with two angled surfaces, the upper section of the opposite side edge of the cutting edge is a side initial surface, the lower section of the opposite side edge is a side end surface, and the lower side edge of the lower initial surface close to the opposite side of the opposite side is a lower initial surface, the lower terminating surface is adjacent to the cutting edge, the side starting surface is at 90 degrees to the lower starting surface, and the side terminating surface is at 90 degrees to the lower terminating surface.

Further, the pilot cutting groove is parallel to the drill rod.

The utility model discloses an advantage and effect do:

the utility model discloses terminal inflation piece drill bit can drill out inside and has a reaming mounting hole, construction convenience.

Drawings

FIG. 1 is a schematic view of the assembly structure of the end expansion member drill of the present invention;

FIG. 2 is a cross-sectional view of the end expansion member drill of the present invention;

FIG. 3 is a schematic view of a drill pipe;

FIG. 4 is a schematic view of a cutting head;

FIG. 5 is a first schematic view of the operation of the end expansion member drill of the present invention;

fig. 6 is a second working schematic diagram of the drill bit of the present invention.

The components in the figure: 1 is a drill rod, 2 is a cutting head, 3 is a cutter shaft, 4 is a cutting storage groove, 5 is a cutting guide groove, 6 is a side starting surface, 7 is a lower terminating surface, 8 is a side terminating surface, 9 is a lower starting surface, 10 is a cutting head mounting groove, 11 is a cutting head fixing hole, 12 is a contact bottom surface, 13 is a side plane, 14 is a cutting edge, 15 is a cutting head center hole, and 16 is a hole.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

As shown in fig. 1-4, the drill bit of the present invention comprises a drill rod 1, a cutting head 2, a cutting head mounting groove 10 at a right angle is formed at the upper side of the drill rod 1, a cutting head fixing hole 11 perpendicular to the wall of the groove is formed on the wall of both sides of the drill rod 10 as viewed in the drawing, one end of the cutting head mounting groove 10 in the circumferential direction is closed, a side plane 13 is formed inside the cutting head mounting groove, the side plane 13 is connected to the bottom surface 12 of the groove and is perpendicular to the bottom surface of the groove to form 90 °, fig. 2 is the cutting head, a cutting head center hole 15 is formed in the cutting head 2 as viewed in the drawing, the cutting head 2 is fixed to the cutting head fixing hole 11 by a cutter shaft 3, the cutting head 2 and the cutter shaft 3 are movably fitted, the cutter shaft 3 and the cutting head fixing hole 11 are statically fitted, a cutting groove 4 is formed below the cutting head mounting groove 10 on the drill rod 1 at a distance, a cutting guide groove 5 is formed between the cutting head mounting groove 10 and the cutting groove 4, the pilot cutting flute 5 is parallel to the drill rod 1, the cutting head 2 is a polygonal cemented carbide block, except for the aforementioned cutting head central bore 15, the cutting edge 14 is mounted at the open end of the cutting head mounting flute 10, the other side of the cutting edge 14 of the cutting head 2 has two angled faces, the lateral start face 6 at the upper side, the lateral end face 8 at the lower side, the lower side of the cutting head 2 also has two angled faces, the 7 adjacent to the cutting edge 14 being the lower end face, and the 9 adjacent to the closed end of the cutting head mounting flute 10 being the lower start face. Wherein the lateral starting surface 6 is at 90 deg. to the lower starting surface 9 and the lateral end surface 8 is at 90 deg. to the lower end surface 7. The angles of the lateral start surface 6 and the lower segment, i.e. the lateral end surface 8, the lower start surface 9 and the lower end surface 7, and the cutting head mounting groove 10, may be identical.

As shown in fig. 5-6, the utility model discloses a method for using the end expansion piece drill bit is: the drill is started, the drill rod 1 drives the cutting head 2 to rotate along the center of the drill rod 1 through the cutter shaft 3, pressure is applied to the hole 16, the cutting head 2 rotates along the center of the drill rod, the cutting head can only rotate along the cutter shaft 3 towards the open end of the cutting head installation groove 10, namely the cutting edge, due to the limitation of the side starting surface 6 and the lower starting surface 9, the cutting head 2 is made of hard alloy, the hole wall of the cutting head is started to be cut till the side terminating surface 8 contacts the side plane 13, and the lower terminating surface 7 contacts the bottom surface 12, as shown in the right side of the figure. The end expander drills to complete the reaming and the cutting edges of the cutting head 2 machine the end of the straight hole into a tapered hole with a larger end diameter. And finally, pulling out the electric drill, and enabling the cutting head 2 of the drill bit of the tail end expansion piece to restore to the initial position under the action of the hole wall, so that the drill bit can smoothly exit.

Claims

1. A tip expander drill bit, comprising: the cutting head structure comprises a drill rod (1) and a cutting head (2), wherein a cutting head mounting groove (10) is formed in the top of the drill rod (1), the cutting head mounting groove (10) is L-shaped, the other end of the cutting head mounting groove is an open end, a cutting head fixing hole (11) is formed in the side wall of the cutting head mounting groove (10), a cutting guide groove (5) is formed in the lower portion of the open end of the cutting head mounting groove (10), a cutting storage groove (4) is formed below the cutting head mounting groove (10), the cutting head mounting groove (10) is communicated with the cutting storage groove (4) through the cutting guide groove (5), a cutting head central hole (15) is formed in the middle of the cutting head (2), the cutting head fixing hole (11) is connected with the cutting head central hole (15) through a cutter shaft (3), the cutting head (2) is polygonal, a cutting edge (14) of the cutting head mounting groove (10) is located at the open end, and two angled surfaces are respectively arranged on the opposite side and the lower side of the cutting edge (14), the relative upper segment of limit of cutting edge (14) is side initial surface (6), and the hypomere is side terminal surface (8), cutting edge (14) downside limit is close to relative limit and is lower initial surface (9), is close to cutting edge (14) and is lower terminal surface (7), side initial surface (6) become 90 with lower initial surface (9), and side terminal surface (8) become 90 with lower terminal surface (7).

2. The tip expander drill bit of claim 1, wherein: the guide cutting groove (5) is parallel to the drill rod (1).