CN211758726U

CN211758726U - Connecting structure of drill bit and drill cutter body

Info

Publication number: CN211758726U
Application number: CN202020205104.7U
Authority: CN
Inventors: 侯雅旻; 韩飞
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-02-25
Filing date: 2020-02-25
Publication date: 2020-10-27
Anticipated expiration: 2030-02-25

Abstract

The utility model discloses a connection structure of drill bit and drill cutter body, hexagonal plate in cutter body, tool bit, screw rod and the speciality, tool bit and cutter body are connected through the screw rod, the one end that the cutter body is connected with the tool bit is equipped with the mounting groove to the branch is equipped with cutter body clamping face and cutter body locating surface, through hexagonal plate rotates the screw rod in the speciality, will the tool bit is drawn into in the mounting groove of cutter body, the tool bit bottom surface of tool bit is equipped with the screw thread blind hole, the cutter body excircle is equipped with the cutter body chip groove of two relative axis symmetries, just the tool bit excircle is equipped with the tool bit chip groove of two relative axis symmetries, the reliable pressure of tool bit locating surface is on the cutter body locating surface, and cutter body chip groove and the butt joint of tool bit chip. The connecting structure of the drill bit and the drill bit body is reliable in connection, high in precision, low in production cost and convenient and fast in bit replacement, sufficient rigidity is achieved in the machining process, the use cost of the tool is obviously reduced, and the precision of a machined hole is improved.

Description

Connecting structure of drill bit and drill cutter body

Technical Field

The utility model relates to a metal processing device field especially relates to a connection structure of drill bit and drill cutter body.

Background

In the metal hole machining process, the disposable drill bit with the replaceable cutter head can greatly reduce the production cost and improve the economic benefit. At present, the connection form that often adopts is mostly the bolt side tensioning formula, or relies on the elastic deformation of metal cutter body to add the connection form of holding the tool bit. The problems with both of these configurations are: the former can form a stress concentration area, and the situation of sudden breakage can occur in the drilling process, so that the serious consequence of scrapping a tool bit, a tool body and a workpiece at the same time is caused; in the latter type of connection, the elasticity is gradually lost due to fatigue of the metal itself, which leads to a situation in which a tool shank is scrapped after several tool bit changes. Both of these results may make the advantage of the disposable drill bit in reducing the production cost less obvious, and therefore, we propose a connection structure of the drill bit and the drill body.

SUMMERY OF THE UTILITY MODEL

The utility model provides a connection structure of drill bit and drill cutter body solves the problem that above-mentioned background art provided.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a connection structure of a drill bit and a drill bit body comprises a bit body, a screw rod and a special inner hexagonal plate, wherein the bit body is connected with the bit body through the screw rod, one end of the bit body, which is connected with the bit body, is provided with a mounting groove, and is respectively provided with a bit body clamping surface and a bit body positioning surface, the bit body is pulled into the mounting groove of the bit body by rotating the screw rod through the special inner hexagonal plate, a first included angle is formed between the two surfaces of the bit body clamping surface and the bit body positioning surface, a bit body bottom surface is arranged in the bit body, a threaded through hole is formed in the center of the bottom surface of the bit body, the bit body is circumferentially provided with a bit clamping surface and a bit positioning surface, a second included angle is formed between the two surfaces of the bit clamping surface and the bit positioning surface, the bit bottom surface of the bit body is provided with a threaded blind hole, the, the reliable pressure of tool bit locating surface is on the cutter body locating surface, and cutter body chip groove and the butt joint of tool bit chip groove form complete chip removal space, the cutter body excircle is equipped with a horizontal transverse through hole, and the inside axial direction through-hole that sets up of cutter body, transverse through hole and axial direction through-hole run through each other to be close to in mounting groove peak both sides cutter body clamping surface and the crossing department of cutter body locating surface respectively are equipped with one and link up with transverse through hole for axial symmetry's interior cold bore, transverse through hole both sides are close to excircle department and impress the steel ball and seal.

Preferably, the screw is connected with the screw on one side of the cutter body and is a reverse screw thread, the screw connected with the cutter head is a positive screw thread, and the special inner hexagonal plate inserted from the tail of the cutter body can pull the cutter head into the mounting groove of the cutter body only by clockwise rotation.

Preferably, the periphery of one end, close to the bottom surface of the cutter head, which enters the cutter body, is provided with a necking for guiding the cutter head when the cutter head is pulled into the installation groove of the cutter body by a screw.

Preferably, the bottom surface of the cutter body is in interference fit with the clamping surface of the cutter head, the bottom surface of the cutter head is reliably matched with the bottom surface of the cutter body without a gap, and the clamping surface of the cutter body and the clamping surface of the cutter head form a torsion around the axis of the cutter through interference fit.

Preferably, interference fit between the bottom surface of the cutter body and the clamping surface of the cutter head can form a torsion force around the axis of the cutter body, the positioning surface of the cutter head is reliably pressed on the positioning surface of the cutter body, and the positioning surface of the cutter body and the positioning surface of the cutter head are in transition fit.

Preferably, a first included angle formed between the bottom surface of the cutter body and the positioning surface of the cutter body is 155.5 degrees, and a second included angle formed between the cutter head clamping surface and the cutter head positioning surface is 155 degrees.

Preferably, after the cutter head and the cutter body are connected through the screw, the bottom surface of the cutter head and the bottom surface of the cutter body are reliably matched without a gap, and an internal cooling liquid channel is formed by the axial through hole, the transverse through hole and the internal cooling hole.

Preferably, the width of the cutter body positioning surface of the cutter body is in transition fit with the width of the cutter head positioning surface, and the width of the cutter body clamping surface of the cutter body is in interference fit with the width of the cutter head clamping surface.

The utility model has the advantages that:

this connection structure of drill bit and drill cutter body is practical, and the operation is thus simple, and the steam generator is novel in structure and reliable, and in the connection process, the screw rod provides the engaging force in the axial direction, the torsion around the cutter body axis that cutter body clamping face and tool bit clamping face formed, the locating surface of tool bit and the locating surface of cutter body closely reliable pressure together, make tool bit and cutter body close as an organic whole in the maximum scope, in drilling, the atress is even between tool bit and the cutter body, no stress concentration, the drilling process is more reliable and more stable, the cutter life-span has been improved, the production cost is obviously reduced, the quality of the work piece that is processed is also more guaranteed.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of a part of an enlarged structure at a in fig. 1 according to the present invention.

Fig. 3 is a schematic view of the horizontal main view structure of the present invention.

Fig. 4 is the internal structure diagram of the knife body of the present invention.

Fig. 5 is a schematic top view of the knife body of the present invention.

Fig. 6 is a schematic top view of the tool bit of the present invention.

Reference numbers in the figures: 1. a cutter body; 11. a cutter body clamping surface; 12. a cutter body positioning surface; 13. a first included angle; 14. the width of the clamping surface of the cutter body; 15. the width of the positioning surface of the cutter body; 16. a threaded through hole; 17. a cutter body chip groove; 18. a transverse through hole; 19. an axial through hole; 110. an internal cooling hole; 111. a bottom surface of the cutter body; 2. a cutter head; 21. a bit holding surface; 22. a cutter head positioning surface; 23. a second included angle; 24. the width of the clamping surface of the cutter head; 25. the width of the positioning surface of the cutter head; 26. a threaded blind hole; 27. a chip groove of the tool bit; 28. necking; 29. a bottom surface of the tool bit; 3. a screw; 4. a special inner hexagonal plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-6, a connection structure of a drill bit and a drill bit body comprises a bit body 1, a bit 2, a screw rod 3 and a special inner hexagonal plate 4, wherein the bit 2 and the bit body 1 are connected through the screw rod 3, one end of the bit body 1 connected with the bit 2 is provided with a mounting groove and is respectively provided with a bit clamping surface 11 and a bit positioning surface 12, the screw rod 3 is rotated through the special inner hexagonal plate 4 to draw the bit 2 into the mounting groove of the bit body 1, a first included angle 13 is formed between the two surfaces of the bit clamping surface 11 and the bit positioning surface 12, a bit bottom surface 111 is arranged inside the bit body 1, a threaded through hole 16 is arranged at the center of the bit bottom surface 111, the bit 2 is circumferentially provided with a bit clamping surface 21 and a bit positioning surface 22, a second included angle 23 is formed between the two surfaces of the bit clamping surface 21 and the bit positioning surface 22, a threaded blind hole 26 is arranged at the bit bottom surface, two axially symmetrical tool bit chip grooves 27 are arranged on the excircle of the tool bit 2, a tool bit positioning surface 22 is reliably pressed on a tool body positioning surface 12, the tool body chip grooves 17 and the tool bit chip grooves 27 are in butt joint to form a complete chip removal space, a transverse through hole 18 is arranged on the excircle of the tool body 1, an axial through hole 19 is arranged in the tool body 1, the transverse through hole 18 and the axial through hole 19 are mutually penetrated, an inner cooling hole 110 which is symmetrical relative to the axial direction is respectively arranged at the two sides of the highest point of the mounting groove, which are close to the intersection of the tool body clamping surface 11 and the tool body positioning surface 12, and is communicated with the transverse through hole 18, steel balls are pressed into the positions, which are close to the excircle, of the transverse through hole 18, a screw thread at one side of the screw 3 connected with the tool body 1 is a reverse screw thread, a screw thread at one side of the tool bit 2 is, the periphery of one end of the cutter head 2, which enters the cutter body 1 and is close to the cutter head bottom surface 29, is provided with a reducing opening 28 for guiding the cutter head 2 to be pulled into a cutter body 1 installation groove by a screw 3, the cutter body bottom surface 111 and the cutter head clamping surface 21 are in interference fit, the cutter head bottom surface 29 and the cutter body bottom surface 111 are reliably matched without a gap, the cutter body clamping surface 11 and the cutter head clamping surface 21 are in interference fit to form a torsion force around the axis of the cutter, the interference fit between the cutter body bottom surface 111 and the cutter head clamping surface 21 can form a torsion force around the axis of the cutter body 1, the cutter head positioning surface 22 is reliably pressed on the cutter body positioning surface 12, the cutter body positioning surface 12 and the cutter head positioning surface 22 are in transition fit, a first included angle 13 formed by the cutter body bottom surface 111 and the cutter body positioning surface 12 is 155.5 degrees, a second included angle 23 formed by the cutter head clamping surface 21, the bottom surface 29 of the cutter head and the bottom surface 111 of the cutter body are reliably matched without a gap, an inner cooling liquid channel is formed by the axial through hole 19, the transverse through hole 18 and the inner cooling hole 110, the width 15 of the cutter body positioning surface of the cutter body 1 is in transition fit with the width 25 of the cutter head positioning surface, and the width 14 of the cutter body clamping surface of the cutter body 1 is in interference fit with the width 24 of the cutter head clamping surface.

The working principle is as follows: when the connection structure of the drill bit and the drill cutter body is used, firstly, the screw rod 3 is clockwise rotated through the special inner hexagonal plate 4, the bit 2 and the cutter body 1 are connected together, circumferential clamping force around an axis is formed between the bit 2 and the cutter body 1, the bit 2 is guided to be installed into the installation groove of the cutter body 1 through the reducing opening 28 arranged at one end of the cutter body 1, one end of an axial through hole is blocked by the bit after the bit 2 is installed into the cutter body 1, and cooling liquid is discharged from the center of a machine tool spindle, enters the axial through hole 19 through the tail end of the cutter body 1, passes through the transverse through hole 18, is sprayed from the inner cooling hole 110 and is applied to a cutting area; the axial force is provided through the screw rod 3, and the circumferential torsion force formed by the cutter body clamping surface 11 and the cutter head clamping surface 21 is used for tightly and reliably connecting the cutter head 2 and the cutter body 1 together, so that the cutter head 2 and the cutter body 1 are combined into a whole to the maximum extent, and when a hole is drilled, the force is continuously and stably transmitted between the cutter head 2 and the cutter body 1 without stress concentration, so that the drilling process is more stable and reliable, the service life of a cutter is prolonged, the production cost is obviously reduced, and the quality of a processed workpiece is also more ensured.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. A connecting structure of a drilling tool bit and a drilling tool body comprises the drilling tool body (1), the drilling tool bit (2), a screw rod (3) and a special inner hexagonal plate (4), wherein the drilling tool bit (2) and the drilling tool body (1) are connected through the screw rod (3), one end, connected with the drilling tool bit (2), of the drilling tool body (1) is provided with a mounting groove and is respectively provided with a cutting tool body clamping surface (11) and a cutting tool body positioning surface (12), the screw rod (3) is rotated through the special inner hexagonal plate (4) to pull the drilling tool bit (2) into the mounting groove of the drilling tool body (1), a first included angle (13) is formed between the cutting tool body clamping surface (11) and the cutting tool body positioning surface (12), a bottom surface (111) is arranged inside the drilling tool body (1), a threaded through hole (16) is formed in the center of the cutting tool body bottom surface (111), the drilling tool bit (2) is circumferentially provided, form second contained angle (23) between two faces of tool bit clamping face (21) and tool bit locating surface (22), tool bit bottom surface (29) of tool bit (2) is equipped with screw thread blind hole (26), cutter body (1) excircle is equipped with two relative axisymmetric cutter body chip grooves (17), just tool bit (2) excircle is equipped with two relative axisymmetric cutter head chip grooves (27), reliable pressure of tool bit locating surface (22) is on cutter body locating surface (12), and cutter body chip grooves (17) and cutter head chip grooves (27) dock and form complete chip removal space, cutter body (1) excircle is equipped with a horizontal through-hole (18), and cutter body (1) inside sets up axial through-hole (19), horizontal through-hole (18) and axial through-hole (19) run through each other to be close to in mounting groove peak both sides cutter body clamping face (11) and cutter body locating surface (12) intersect and respectively are equipped with an interior cold bore (110) for axial symmetry The steel ball sealing device is communicated with the transverse through hole (18), and steel balls are pressed into the positions, close to the excircle, of two sides of the transverse through hole (18) for sealing.

2. The structure of claim 1, wherein the drill bit and the drill body are connected to each other by: the thread on one side of the screw rod (3) connected with the cutter body (1) is a reverse thread, the thread on one side of the screw rod connected with the cutter head (2) is a positive thread, and the special inner hexagonal plate (4) inserted from the tail of the cutter body (1) only needs to rotate clockwise to draw the cutter head (2) into the mounting groove of the cutter body (1).

3. The structure of claim 1, wherein the drill bit and the drill body are connected to each other by: and a necking (28) is arranged on the periphery of one end, close to the bottom surface (29), of the cutter head (2) entering the cutter body (1) and used for guiding the cutter head (2) when being pulled into the mounting groove of the cutter body (1) by the screw (3).

4. The structure of claim 1, wherein the drill bit and the drill body are connected to each other by: the cutter body bottom surface (111) and the cutter head clamping surface (21) are in interference fit, the cutter head bottom surface (29) and the cutter body bottom surface (111) are reliably matched without a gap, and the cutter body clamping surface (11) and the cutter head clamping surface (21) form a torsion around the axis of the cutter through interference fit.

5. The structure of claim 1, wherein the drill bit and the drill body are connected to each other by: the interference fit between the bottom surface (111) of the cutter body and the clamping surface (21) of the cutter head can form a torsion force around the axis of the cutter body (1), the positioning surface (22) of the cutter head is reliably pressed on the positioning surface (12) of the cutter body, and the positioning surface (12) of the cutter body and the positioning surface (22) of the cutter head are in transition fit.

6. The structure of claim 1, wherein the drill bit and the drill body are connected to each other by: a first included angle (13) formed by the cutter body bottom surface (111) and the cutter body positioning surface (12) is 155.5 degrees, and a second included angle (23) formed by the cutter head clamping surface (21) and the cutter head positioning surface (22) is 155 degrees.

7. The structure of claim 1, wherein the drill bit and the drill body are connected to each other by: after the cutter head (2) and the cutter body (1) are connected through the screw (3), the bottom surface (29) of the cutter head and the bottom surface (111) of the cutter body are reliably matched without a gap, and an inner cooling liquid channel is formed by the axial through hole (19), the transverse through hole (18) and the inner cooling hole (110).

8. The structure of claim 1, wherein the drill bit and the drill body are connected to each other by: the width (15) of the cutter body positioning surface of the cutter body (1) is in transition fit with the width (25) of the cutter head positioning surface, and the width (14) of the cutter body clamping surface of the cutter body (1) is in interference fit with the width (24) of the cutter head clamping surface.