CN210731118U

CN210731118U - Guiding type drill bit

Info

Publication number: CN210731118U
Application number: CN201921842907.7U
Authority: CN
Inventors: 王光兵; 尹华水; 张富贵; 叶兴
Original assignee: Chengdu Bangpu Cutting Tools Co ltd
Current assignee: Chengdu Priusxing Cemented Carbide Co ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-06-12
Anticipated expiration: 2029-10-30

Abstract

The utility model relates to a machining cutter field, concretely relates to direction type drill bit. The guide type drill bit is provided with the guide body through the bottom, and the corresponding groove is arranged on the connecting end face of the drill bit driving shaft, so that the drill bit and the rotary driving shaft can be tightly connected when being connected, the connection and positioning accuracy is improved, the connection consistency of the drill bit and the drill bit driving shaft is improved, the structure is simple, the operation is very convenient and easy, the welding efficiency of the drill bit and the rotary driving shaft is improved, the skill proficiency requirement of workers, the production cost and the rejection rate are reduced, and the economic benefit is good.

Description

Guiding type drill bit

Technical Field

The application relates to the field of machining tools, in particular to a guide type drill bit.

Background

The drill bit is a common tool in the field of machining tools and is mainly used for drilling on a machining surface. The drill bit mainly refers to a drill bit used in the woodworking processing industry and the similar industry, the end face and the side face of the drill bit are generally provided with cutting edges, the end part of the drill bit is provided with a drill core, and in the rotary feeding process of the drill bit, the drill bit is continuously discharged and cut through a discharging cutting groove, and finally drilling operation is finished.

When the conventional drill bit is used, the drill bit driving shaft needs to be matched for use, and particularly, the bottom surface of the drill bit is connected with the connecting end surface of the drill bit driving shaft in a welding mode, so that the drill bit is fixedly connected with the drill bit driving shaft. However, in the welding process of the traditional drill bit, the problem that guiding and positioning are difficult exists, so that the integral welding rejection rate is high, the requirement on the skill and proficiency of a welding worker is high, and the use cost of the traditional welding drill bit is greatly increased.

SUMMERY OF THE UTILITY MODEL

The application provides a direction type drill bit, a serial communication port, including spiral main part, central point and guide body the central point sets up in the terminal surface middle part of spiral main part, the spiral main part is equipped with the cutting edge the guide body sets up in spiral main part bottom surface middle part, including weld face and guide cylinder, the guide body passes through weld face and drill bit drive shaft terminal surface fixed connection, the guide cylinder is the columnar body, the drill bit drive shaft is equipped with the recess the same with guide cylinder size and shape, the guide cylinder inserts in the recess.

Optionally, the guide cylinder is a guide cylinder.

Optionally, the diameter d and the height h of the guide cylinder satisfy: h is not less than d and not more than 1.5 h.

Optionally, a chamfer is arranged at the bottom of the guide cylinder.

Optionally, an included angle β between two side edges of the same middle axial plane on the welding surface meets the condition that β is more than or equal to 100 degrees and less than or equal to 120 degrees.

Optionally, the cutting edge is divided into a spiral cutting edge and an end cutting edge, the spiral cutting edge is disposed on a side surface of the spiral main body, the end cutting edge is disposed on an end surface of the spiral main body, and a spiral angle α of the spiral cutting edge satisfies that 15 degrees is larger than or equal to α degrees and smaller than or equal to 20 degrees.

Optionally, the center point is composed of a truncated cone body and a spherical crown body, the bottom surface of the truncated cone body is fixedly connected with the end surface of the spiral main body, the bottom surface of the spherical crown body is fixedly connected with the top surface of the truncated cone body, and an included angle γ between two side edges of the same central axis surface on the side surface of the truncated cone body is 60 °.

This application direction type drill bit sets up the guide body through the bottom to set up the recess that corresponds at drill bit drive shaft connection terminal surface, make drill bit and turn round the drive shaft when connecting, can keep zonulae occludens, improve the accuracy of connecting the location, thereby improve drill bit and drill bit drive shaft connection's uniformity, and the structure is comparatively simple, the operation is also very convenient easily to be handed, the welding efficiency of drill bit and turn round the drive shaft has been improved, the requirement of workman's skill proficiency has been reduced, manufacturing cost and rejection rate, fine economic benefits has.

Drawings

FIG. 1 is a schematic, diagrammatic view of the pilot-type bit structure;

FIG. 2 is a schematic view of a specific structure of the pilot drill bit;

FIG. 3 is a top view of the pilot-type drill bit;

FIG. 4 is a schematic view of the diameter and height of the guide body;

FIG. 5 is a schematic view of the pilot bit at a major angle;

FIG. 6 is a schematic representation of the pilot bit application.

The reference numbers in the figures illustrate:

10-guide body, 11-welding surface, 12-guide cylinder, 13-chamfer, 20-spiral body, 21-spiral flank, 22-spiral clearance surface, 23-spiral cutting edge, 24-spiral row cutting groove, 25-connecting surface, 26-end flank, 27-end cutting edge, 28-first chamfer surface, 29-second chamfer surface, 30-center tip, 31-circular truncated cone and 32-spherical crown body.

Detailed Description

The present invention will be described with reference to the accompanying drawings and embodiments.

As shown in fig. 1 to 6, the present invention provides a pilot drill, which includes a spiral main body 20 and a center tip 30, wherein the center tip 30 is a drill tip portion of the drill, the spiral main body 20 is provided with a cutting edge, and the cutting edge is a cutting component of the drill; the center point 30 is provided at the middle of the end surface of the spiral body 20. The spiral body 20 and center point 30 are of conventional configuration, as will be appreciated by those skilled in the art. Compared with the conventional arrangement, the guide type drill is further provided with a guide body 10, and the guide body 10 is a guide positioning part of the drill and is arranged and fixed at the middle part of the bottom surface of the spiral main body 20. Specifically, the guide body 10 includes guide cylinder and face of weld 11, the guide cylinder is the columnar structure, preferably the cylinder structure, face of weld 11 is the side shape of round platform, is fan ring shape after the expansion, the effect of face of weld 11 is the connection terminal surface of laminating to the drill bit drive shaft to through welded connection's mode with the face of weld 11 and the connection terminal surface fixed connection of drill bit drive shaft of drill bit, make drill bit and drill bit drive shaft fixed connection form overall structure. The guide cylinder is arranged in the middle of the welding surface 11 and is perpendicular to and corresponds to the bottom surface of the circular truncated cone formed by the welding surface 11, a groove with the same size and shape as the guide cylinder is formed in the middle of the connecting end surface of the drill driving shaft, the guide cylinder is inserted into the groove, the welding surface 11 is in contact with the connecting end surface of the drill driving shaft, and by means of the mode, positioning before welding of the drill and the drill driving shaft can be completed, in the welding process, the drill and the drill driving shaft can be kept stable without relative sliding, the connection accuracy of the drill and the drill driving shaft is improved, in addition, a chamfer 13 is preferably arranged at the bottom of the guide cylinder, and the guide cylinder can be more easily inserted into the groove through the chamfer 13.

One specific construction and method of use of the steerable drill bit described herein is described below in conjunction with specific embodiments, it being noted that the present application includes, but is not limited to, the following embodiments.

Examples

The novel guiding drill comprises a guide body 10, a spiral main body 20 and a center point 30, wherein the center point 30 is a drill point part of a drill, the spiral main body 20 is a cutting part of the drill, the center point 30 is arranged in the middle of the end face of the spiral main body 20, the guide body 10 is a guiding and positioning part of the drill and is fixedly arranged in the middle of the bottom face of the spiral main body 20, specifically, the guide body 10 comprises a guide cylinder 12 and a welding face 11, the guide cylinder 12 is of a cylinder structure, the diameter length d and the height h of the guide cylinder 12 meet that d is not less than 1.5h, the welding face 11 is of a circular truncated cone shape and is in a fan-ring shape after being unfolded, an included angle β of two side edges of the same middle axial face on the welding face meets that 100 degrees or more than β degrees or less than 120 degrees, the welding face 11 is used for being attached to a connecting end face of a driving shaft of the drill, the welding face 11 of the drill is fixedly connected with the connecting end face of the driving shaft of the drill, the drill and is fixedly connected with the connecting face of the driving shaft of the drill, so that the drill and the drill are fixedly connected to form an integral structure, the drill driving shaft, the connecting face of the drill is arranged in a guide cylinder 12, the middle of the driving shaft, the guiding cylinder 12 and the driving shaft, the connecting face of the driving shaft, the driving shaft can be connected with the driving shaft in a driving shaft, the guiding cylinder 12, the guiding cylinder, the driving shaft can be connected with.

The spiral body 20 is provided with two sets of spiral cutting edges 23 and two sets of end cutting edges 27, the spiral cutting edges 23 are arranged on the side surfaces of the spiral body 20 and participate in the cutting of the side surfaces of the drill, the end cutting edges 27 are arranged on the end surfaces of the spiral body 20 and participate in the cutting of the end surfaces of the drill, the side surfaces of the spiral body 20 are provided with spiral flank surfaces 21 and spiral relief surfaces 22, the spiral flank surfaces 21 and the spiral relief surfaces 22 are concentric cylindrical surfaces, a connecting surface 25 for transition is arranged between the spiral flank surfaces 21 and the spiral relief surfaces 22 of the same set, in addition, spiral cutting grooves 24 are arranged between the spiral flank surfaces 21 and the spiral relief surfaces 22 of different sets, the spiral cutting grooves 24 are used for discharging the cutting generated by the cutting edges, the spiral cutting edges 23 are arranged at the intersection line of the spiral cutting grooves 24 and the spiral flank surfaces 21, the spiral angle of the spiral cutting edges 23 is α, the spiral angle α meets the condition that 15 degrees is not less than α degrees and not more than 20 degrees, the end cutting edges 27 of the spiral cutting bodies 20 are provided with end relief grooves 26 in the rear surface of the cutting direction, the cutting edges 28 and the spiral cutting edges 29 are arranged at the same angle, the rear surface, the end cutting surface 29, the spiral cutting grooves 29, and the spiral cutting grooves 29 are not communicated with the end cutting edges, thereby improving the cutting grooves, and the spiral cutting efficiency of the spiral cutting edges, and the spiral.

The center point 30 is composed of a truncated cone body 31 and a spherical crown body 32, the bottom surface of the truncated cone body 31 is fixedly connected with the end surface of the spiral main body 20, and the bottom surface of the spherical crown body 32 is fixedly connected with the top surface of the truncated cone body 31, so that a relatively round drill point part is formed. The spherical crown body 32 is a drill core part of the drill bit, and through the arrangement, the diameter of the bottom surface of the circular truncated cone body 31 is larger than that of the drill core. In addition, an included angle γ of 60 ° is formed between two side edges of the same central axis surface on the side surface of the truncated cone 31.

The guide type drill bit of the present embodiment can be stably connected with a drill bit driving shaft under the action of the guide body 10, and the specific connection mode is as follows:

firstly, a guide cylinder 12 of a drill bit is aligned and inserted into a cylindrical groove of a drill bit driving shaft, so that a welding surface 11 of a guide body 10 is attached to a connecting end surface of the drill bit driving shaft, then a given drill bit acts on a radial acting force attached to the connecting end surface, and finally the welding surface 11 of the guide body 10 is tightly connected with the connecting end surface of the drill bit driving shaft in a welding mode, namely the drill bit is fixedly connected with a rotary head driving shaft.

This application direction type drill bit sets up director 10 through the bottom to connect the recess that the terminal surface set up to correspond at the drill bit drive shaft, make drill bit and turn round the drive shaft when connecting, can keep zonulae occludens, improve the accuracy of connecting the location, thereby improve drill bit and drill bit drive shaft connection's uniformity, and the structure is comparatively simple, the operation is also very convenient easily to be handed, the welding efficiency of drill bit and turn round the drive shaft has been improved, the requirement of workman's skill proficiency has been reduced, manufacturing cost and rejection rate, there is fine economic benefits.

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.

Claims

1. The utility model provides a direction type drill bit, its characterized in that, including spiral main part, central point and guide body the central point sets up in the terminal surface middle part of spiral main part, spiral main part is equipped with the cutting edge the guide body sets up in spiral main part bottom surface middle part, including weld face and guide cylinder, the guide body passes through weld face and drill bit drive shaft terminal surface fixed connection, the guide cylinder is the cylindricality body, the drill bit drive shaft is equipped with the recess the same with guide cylinder size and shape, the guide cylinder inserts in the recess.

2. A pilot bit according to claim 1, wherein the pilot cylinder is a pilot cylinder.

3. A drag bit according to claim 2, characterized in that the diameter d and the height h of the drag cylinder satisfy: h is not less than d and not more than 1.5 h.

4. A pilot bit according to claim 1, wherein the pilot cylinder is chamfered at its base.

5. The pilot bit of claim 1, wherein the included angle β between the two sides of the weld face in the same medial plane is 100 ° - β ° -120 °.

6. The pilot bit of claim 1, wherein the cutting edges are divided into spiral cutting edges provided on the side surfaces of the spiral body and end cutting edges provided on the end surfaces of the spiral body, and the spiral angle α of the spiral cutting edges satisfies 15 ° - α ° -20 °.

7. The pilot bit according to claim 1, wherein the center point comprises a truncated cone and a spherical cap, the bottom of the truncated cone is fixedly connected to the end surface of the spiral body, the bottom of the spherical cap is fixedly connected to the top of the truncated cone, and the side surface of the truncated cone has an included angle γ of 60 ° with the two side edges of the same central axis plane.