CN111497033A

CN111497033A - Tail end expansion piece drill bit

Info

Publication number: CN111497033A
Application number: CN202010410466.4A
Authority: CN
Inventors: 王秀秀
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-15
Filing date: 2020-05-15
Publication date: 2020-08-07

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 drill bit of the tail end expansion piece can drill the mounting hole with the inner hole enlarged, and the construction is convenient.

Description

Tail end expansion piece drill bit

Technical Field

The invention belongs to the technical field of machining tools, and particularly relates to a drill bit of a tail end expansion piece.

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.

Disclosure of Invention

In view of the above problems, the present invention provides a drill for a distal end expansion member, which is capable of expanding the diameter of the distal end of a hole, so that the distal end expansion member is clamped in the hole and exceeds the range of expansion caused by heat and contraction caused by cold of a screw, thereby achieving the purpose of fastening.

The invention adopts the following technical scheme:

an expandable end bit comprises a drill rod and a cutting head, wherein a cutting head mounting groove is formed in the top of the drill rod, the cutting head mounting groove is L-shaped, the other end of the cutting head mounting groove is an open end, a cutting head fixing hole is formed in the side wall of the cutting head mounting groove, a cutting guide groove is formed in the lower portion of the cutting head mounting groove at the open end, a cutting storage groove is formed below the cutting head mounting groove, the cutting head mounting groove is communicated with the cutting storage groove through the cutting guide groove, a cutting head central hole is formed in the middle of the cutting head, the cutting head fixing hole is connected with the cutting head central hole through a cutter shaft, the cutting head is polygonal, a cutting edge of the cutting head is located at the open end of the cutting head mounting groove, two angled sides are respectively arranged on the opposite side and the lower side of the cutting edge, the upper section of the opposite side of the cutting edge is a side initial surface, the lower section of the cutting edge is a side terminal surface.

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

The invention has the advantages and effects that:

the drill bit of the tail end expansion piece can drill the mounting hole with the inner hole enlarged, and the construction is convenient.

Drawings

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

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

FIG. 6 is a second schematic view of the operation of the end expansion piece 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 invention is further explained below with reference to the figures and the examples.

As shown in fig. 1-4, the end expansion member drill of the present invention comprises a drill rod 1, a cutting head 2, a cutting head mounting groove 10 at a right angle on 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 the cutting head mounting groove 10, one end of the cutting head mounting groove 10 in the circumferential direction is closed, a side plane 13 is formed inside, the side plane 13 is connected with the bottom surface 12 of the groove and is perpendicular to the bottom surface of the groove at 90 °, fig. 2 is the cutting head, the cutting head 2 has a cutting head center hole 15 as viewed from the cutting head, the cutting head 2 is fixed on the cutting head fixing hole 11 by a cutter shaft 3, the cutting head 2 and the cutter shaft 3 are in movable fit, the cutter shaft 3 and the cutting head fixing hole 11 are in static fit, 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, 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 method of using the end expansion piece drill bit of the present invention is: the drill is activated by clamping the drill against the rear end of the drill rod 1 of the solid end expander drill, and then inserting the drill into the appropriate drilled hole 16, whereby the drill rod 1 via the arbor 3 carries the cutting head 2 along the centre of the drill rod 1 in a rotational movement, while applying pressure in the direction of the hole 16, whereby the cutting head 2, while rotating in the centre of the drill rod, can only rotate along the arbor 3 in the direction of the open end, i.e. the cutting edge, of the cutting head mounting slot 10, limited by the lateral start surface 6 and the lower start surface 9, whereby the cutting head 2 is very hard, starting with a hole wall at the cutting end up to the lateral end surface 8 in contact with the lateral flat surface 13, while the lower end surface 7 is in contact with the bottom surface 12. 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. The expandable end piece drill is characterized by comprising a drill rod (1) and a cutting head (2), wherein a cutting head installation groove (10) is formed in the top of the drill rod (1), the cutting head installation groove (10) is L-shaped, the other end of the cutting head installation groove is an open end, a cutting head fixing hole (11) is formed in the side wall of the cutting head installation groove (10), a cutting guide groove (5) is formed in the lower portion of the open end of the cutting head installation groove (10), a cutting storage groove (4) is formed below the cutting head installation groove (10), the cutting head installation groove (10) is communicated with the 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 installation groove (10) is located at the open end, opposite sides and lower sides of the cutting edge (14) are respectively provided with two angled surfaces, the upper section of the opposite sides of the cutting edge (14) is a starting side starting surface (6), the lower section is a lower section (7), the starting surface (7), and the lower section of the lower section is 90 degrees, the starting surface (7) and the lower section.

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