CN112705759A

CN112705759A - Split type drilling tool

Info

Publication number: CN112705759A
Application number: CN202011520369.7A
Authority: CN
Inventors: 刘军; 刘燕
Original assignee: MIANYANG MIANGONG TOOLS CO Ltd
Current assignee: MIANYANG MIANGONG TOOLS CO Ltd
Priority date: 2020-12-21
Filing date: 2020-12-21
Publication date: 2021-04-27

Abstract

The invention discloses a split type drilling tool, which comprises: the center of one end of the replaceable head module is provided with a drill bit, two sides of the replaceable head module are respectively provided with a reamer matched with the drill bit, and the other end of the replaceable head module is oppositely provided with two first positioning columns; the drill rod body is matched with the replaceable head module, and a first limiting groove for the first positioning column to extend into is formed in the drill rod body; wherein each first positioning column is spatially configured to be in a fan-shaped or multi-lobe convex arc structure; each first positioning column is provided with an arc-shaped surface which is in clearance fit and tangent in multiple sections on one side matched with the side wall of the first limiting groove; the conical drill points of the drill bit are distributed in an S shape in space, and the top of the drill bit is provided with a chisel edge; the chisel edge forms a 1-2mm flat cutting edge at the top end of the drill point. The invention provides a split type drilling tool which has the advantages of higher interchangeability, better centering effect and more excellent cost advantage, and the drill tip has better forming degree of drill cuttings in the drilling process, better drilling processing precision and longer service life.

Description

Split type drilling tool

Technical Field

The invention relates to a drilling tool for machining. More particularly, the present invention relates to a split drilling tool.

Background

The drilling tool is a tool used for drilling holes, drilling holes and the like, and generally comprises a drill body and a cutting edge part which are matched, wherein the cutting edge part is arranged on the drill body through a matched screw or welding mode and the like. In the actual production and use process, the sizes of drill bodies required by holes with various diameters and depths are also varied, so that the variety and the specification of the stock required by customers are very many, and the overall use cost is high. During the machining process, the losses of the drill body are divided into normal losses and abnormal losses: 1. long-time friction of scraps generated in the drilling process can cause damage (normal loss) of a drill body; 2. under the condition that the cutting edge is invalid or other abnormalities are not found, irreversible sudden damage (abnormal loss) of the drill body can be caused, so the loss cost of the drill body in the using process is higher; 3, this kind of condition also can exist when the moment of torsion is too big in the course of working in addition, and this will cause the scrapping of whole root pole, and the finished product is high.

In addition, the existing drill bit usually plays a role in drilling in the drilling process, so that the drill tip of the existing drill bit is of a conical structure in space to play a role in drilling, but the drill tip in the prior art is of a pointed structure and then extends towards two sides, the drilling effect is excellent, but the existing drill bit is not beneficial to spiral forming of iron chips in the drilling process, and the drill bit is greatly shaken in the drilling process to influence the service life and the drilling precision of the drill bit.

Disclosure of Invention

An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.

To achieve these objects and other advantages in accordance with the present invention, there is provided a split type drilling tool, including:

the center of one end of the replaceable head module is provided with a drill bit, two sides of the replaceable head module are respectively provided with a reamer matched with the drill bit, and the other end of the replaceable head module is oppositely provided with two first positioning columns;

the drill rod body is matched with the replaceable head module, and a first limiting groove for the first positioning column to extend into is formed in the drill rod body;

wherein each first positioning column is spatially configured to be in a fan-shaped or multi-lobe convex arc structure;

each first positioning column is provided with an arc-shaped surface which is in clearance fit and tangent in multiple sections on one side matched with the side wall of the first limiting groove;

the conical drill points of the drill bit are distributed in an S shape in space, and the top of the drill bit is provided with a chisel edge;

the chisel edge forms a 1-2mm flat cutting edge at the top end of the drill point.

Preferably, the chisel edge has a minor cutting edge and a major cutting edge which are engaged with each other at positions extending to both sides of the drill body;

the drill bit is characterized in that first chip grooves matched with each other are formed in two sides of the drill bit, and a stress surface matched with the tool apron is arranged on one side opposite to the first chip grooves, so that the drill bit is of an S-shaped structure in space.

Preferably, the reamer is configured to be a polygonal structure, and an arc-shaped back angle is arranged at the top of one side matched with the hole wall so as to form a smoothing blade for supporting the hole wall in space;

the radiused configuration of the relief angle is configured to match the hole radius.

Preferably, a positioning pin matched with one side surface of the first positioning column is arranged in each first limiting groove;

one side of each first positioning column is provided with a positioning surface matched with the positioning pin;

each locating pin is provided with a limiting surface matched with the locating surface, and the limiting surfaces are arranged on the opposite sides in space.

Preferably, the first positioning column is provided with a clamping column matched with the limiting surface;

the clamping column is provided with a conical fixing hole matched with the limiting screw at one side deviated from the limiting surface, and the replaceable head module is fixed in the axial direction through the matching of the conical hole and the conical screw.

Preferably, one end of the drill bit is oppositely provided with two second positioning columns which are matched with each other;

a second limiting groove which is arranged at one end of the replaceable head module and into which the second positioning column can extend, and third chip grooves which are communicated with the second chip grooves on the drill rod are arranged at two sides of the second limiting groove, so that the second limiting groove is in a dovetail shape in space;

the two opposite sides of the second positioning column are provided with fourth chip grooves matched with the drill tips;

the second positioning column is in interference fit with the second limiting groove.

Preferably, the bottom of the second positioning column is provided with a protruding clamping part on at least one side edge matched with the fourth chip groove;

and a groove matched with the clamping part is arranged at the edge of the bottom of the second limiting groove.

Preferably, the top of the drill tip is oppositely provided with a mounting groove matched with the mounting wrench.

Preferably, the drill tip is provided with a fixing surface matched with the rotary mounting direction of the drill tip on the side combined with the third chip groove;

the drill body is provided with a positioning groove matched with the fixing surface;

the fixing device comprises a fixing surface and a positioning groove, wherein one side of the fixing surface is provided with a fixing point with the largest radian, and the positioning groove is provided with a stopping part for stopping the fixing point.

The invention at least comprises the following beneficial effects: firstly, the structure of the positioning mechanism is limited, the connection between the replaceable head module and the drill rod is realized, and the split type and modular design and manufacturing of the drill body are realized, so that the drill body has higher interchangeability, better centering effect and more excellent cost advantage compared with the prior art, the complete transmission of the rotation torque is realized on the premise of ensuring the concentric and axial locking when the drill body is installed and the rotation torque is ensured, and the connection precision and stability are ensured.

Secondly, the positioning column of the invention brings rotating surfaces and positioning surfaces with different space dimensions through the special-shaped structural design, so that the positioning column can rotate as required in the fixing process, and simultaneously is matched with the limiting surface on the positioning pin to complete the close structural fit of the positioning column and the positioning pin in space, and further finishes the clamping in the drill rod after the rotation positioning through a screw, so that the axial stability, the radial stability and the spatial stability of the drill rod can be considered, the structural matching stability and the use stability of the equipment can be ensured, the service life of the equipment is ensured, the resource utilization efficiency is improved, and the use cost is effectively reduced.

Thirdly, the quick disassembly and assembly of the drill bit and the replaceable head module are realized, the time for replacing the drill bit is reduced, the use efficiency of equipment is improved, the service life is longer, the stability is better, the drill bit and the replaceable head module can be connected without screws through the structural design, the quick disassembly and assembly device is more convenient and faster, the connection stability is better, and the convenience and the matching degree of assembly and disassembly of parts are further ensured.

Fourthly, the structure of the second positioning column and the second limiting groove is further limited, the horizontal and longitudinal structure fixation is completed, the stability of structure matching is better, the matching stability of the structural part of the equipment in the rotating process is further ensured through the matching of the fixing surface and the limiting surface, the torque transmission is realized, and the problem that the position change or the clamping of the part is influenced due to the rotation is avoided.

Fifthly, the drill point structure of the drill bit is designed, so that the drill bit is S-shaped in space and is provided with the chisel edge, the drilling and cutting effects of the drill bit are good, the stability of the equipment structure is good, and the forming degree of drill cuttings in the drilling process is better.

Sixth, the invention designs a relief angle of a circular arc structure on the hole expanding cutter, and forms a smoothing blade applied in hole expanding processing, so that the flatness and the smoothing degree of the hole wall processed by drilling can meet the use requirements, secondary processing is not needed, the processing efficiency is effectively improved, the processing procedure is simpler, and further, the relief angle of the smoothing blade adopts a circular arc relief angle surface design matched with the aperture to be processed, so that the relief angle surface can play a role of auxiliary support, and the processing precision can meet the requirements.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

FIG. 1 is a schematic structural diagram of a split type drilling tool according to an embodiment of the present invention;

FIG. 2 is a schematic structural view of a drill rod body according to another embodiment of the present invention;

FIG. 3 is a schematic view of the configuration of the replaceable head module in cooperation with the positioning pin;

FIG. 4 is a schematic view of a drill bit;

FIG. 5 is a schematic view of a reamer;

FIG. 6 is a schematic diagram showing a comparison of the hole wall after drilling according to the prior art and the present invention

FIG. 7 is a schematic view of the feed structure of FIG. 5;

FIG. 8 is a schematic view of the replaceable head module from another perspective;

FIG. 9 is a schematic view of the drill bit from another perspective;

fig. 10 is a schematic view of the replaceable head module from another perspective;

fig. 11 is a partially enlarged view of the replaceable head module from another perspective.

Detailed Description

The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.

It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

It is to be understood that in the description of the present invention, the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are used only for convenience in describing the present invention and for simplification of the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise specifically stated or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are used in a broad sense, and for example, "connected" may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements.

Fig. 1-3 show an implementation of a split drilling tool according to the invention, comprising:

the replaceable head module 1 is provided with a drill bit 2 at the center of one end, matched reaming cutters 3 are respectively arranged at two sides of the replaceable head module, and two first positioning columns 4 are oppositely arranged at the other end of the replaceable head module;

the drill rod body 5 is matched with the replaceable head module, a first limiting groove 6 into which the first positioning column can extend is formed in the drill rod body 5, the first limiting groove and the first positioning column are matched to realize connection of the drill rod body and the first positioning column, the drill rod body and the first limiting groove are matched with each other structurally, and positioning is carried out through insertion;

the first positioning columns are spatially configured to be in a fan-shaped or multi-lobe convex arc structure, and in the structure, the structure of the first positioning columns is limited, so that when the first positioning columns are matched with the first limiting grooves, the first positioning columns and the first limiting grooves have interference, and the performance of equipment cannot be influenced by the accompanying rotation of the drill rod when the drill rod rotates;

each first positioning column is provided with an arc-shaped surface 7 which is in clearance fit and tangent in multiple sections on one side matched with the side wall of the first limiting groove, and the positioning columns have certain rotating allowance, so that the angle of the positioning columns can be finely adjusted to ensure that the low-tension effect of the positioning columns meets the use requirement in the later period when the positioning columns are tightly abutted and positioned through screws;

the conical drill points of the drill bit are distributed in an S shape in space, the top of the drill bit is provided with the chisel edge 8, and compared with the prior art, the structural design of the chisel edge is matched with the cutting edge beside the chisel edge to form a large cutting angle, so that the cutting resistance is greatly reduced, the extrusion of the core part (the chisel edge) of the drill point is facilitated to cut into a processed piece, and the iron scrap forming is facilitated;

the chisel edge forms 1-2 mm's flat blade at the drill point top, and the chisel edge makes the material take place to warp under the normal condition, just begin to cut when main cutting edge contacts with the work piece material, but current chisel edge is pure extrusion at meso position (cutting speed is 1), but traditional chisel edge is very big to being processed the extrusion, and the resistance is big, and the intensity of chisel edge is not enough, and the most easy wearing and tearing or collapse and lack, and through the design of chisel edge structure and space size to this scheme for its intensity at the chisel edge obtains guaranteeing, and life is longer, and the chip removal effect is better.

In another example, as shown in fig. 4, the chisel edge has a secondary cutting edge 9 and a primary cutting edge 10 which are matched with each other at positions extending to two sides of the drill body, in this structure, two matched cutting edges are formed at the top of the drill by the extension of the drill tip, cutting edges formed by two sections of cutting edges are formed at two sides of the drill tip, the two cutting edges form corresponding angles in space so as to meet balanced cutting force transmission and scrap iron discharge, and the primary cutting edge transmits main torque to a rear positioning surface, so that the installation of the drill tip and the stability under the stress working condition are ensured;

drill bit both sides are provided with the first chip groove 11 of matched with, and be provided with blade holder matched with atress face 12 with the relative one side of first chip groove, make the drill bit be S type structure in the space, in this kind of structure, design through the chip groove makes the smooth and easy degree of chip removal in its drilling process better, and the design of atress face, make its drill bit at the rotatory in-process of drilling better with the cooperation degree of blade holder, atress transmission degree of consistency is better, guarantee its drill bit and blade holder complex stability in the adjustment rotation process, prevent the shake that the drill bit produced in the course of working, guarantee the stability of processing, and the life of drill bit.

In another example, as shown in fig. 5, the reamer is configured in a polygonal structure, which has a circular arc relief angle at the top of the side engaged with the hole wall 21 to spatially form a smoothing edge 13 for supporting the hole wall, in this structure, a smoothing edge engaged with the hole wall is provided at the large edge of the reamer through reaming, the smoothing operation is performed on the hole wall during the drilling process feeding, and the structure of the smoothing edge is improved, the circular arc relief angle structure is designed to make it easy to cut into the hole wall by the drilling of the drill compared with the existing plane relief angle, and the conventional design only designs the corner into a rounded corner structure, so the spatial structure cannot form the smoothing edge, the prior art has a wave crest on the plane of the hole wall to be processed as shown in fig. 6, and the flatness of the hole wall cannot be achieved, the hole and the smoothing edge designed at the arc rear angle are flat in the direction, and can directly smooth the wave crests and the wave troughs, so that the straightness and the hole wall quality of the hole can be greatly improved in the machining process;

as shown in fig. 7, the arc structure of the relief angle is configured to match the hole radius, in actual operation, the relief angle of the arc structure design matches the hole radius value of the workpiece to be processed, and it is ensured that the relief angle surface can play a role of auxiliary support, the scheme adopts the arc relief angle design matching (not equal to) the hole radius value, and it is ensured that the distance between the bottom of the arc and the hole wall is a certain specific value, that is, two arcs are tangent, and the relief angle is not large, and the drill cannot cut into the hole wall in the processing process, so as to play a role of supporting, because the straightness of the hole is good, the finishing edge will play a role of finishing and flattening the hole wall in the drill feeding process, and further ensure that the quality of the processed hole wall meets the requirements;

furthermore, the reamer is configured to be in a triangular structure, the mounting hole 14 matched with the cutter holder is formed in the reamer, the triangular structure design is adopted, so that the interference between the reamer and the cutter holder or the cutter bar after the reamer is mounted is better, the structural stability is better, and the reamer is connected with the cutter holder or the cutter bar through the matching of the mounting hole and the screw, so that the later replacement and maintenance are facilitated;

when one side of the reamer is in a problem, the reaming edge on the next side is used for loosening the screw for transposition adjustment, so that the service cycle of the reamer is longer and the service life of the reamer is longer;

the top of each corner department of reamer all is provided with matched with repaiies the light sword, all sets up matched with repaiies the light sword with every side corner for it can cooperate with the reaming sword of different sides, accomplishes the operation of repaieing the light in the reaming, has better adaptability.

In another example, as shown in fig. 3 and 8, a positioning pin 16 is disposed in each first limiting groove and is matched with one side surface of the first positioning column, and is used for limiting the position of the positioning column through the action of the positioning pin;

one side of each first positioning column is provided with a positioning surface 17 matched with the positioning pin;

each locating pin is provided with the locating surface matched with and restricts the face 18, and in space the limit face is configured to in one side that keeps away from, in the external action is rotatory at actual operation for the reference column is in restricting the inslot rotation, makes each locating surface and complex limit face cooperate and paste closely, accomplishes the fixed of the two, under this kind of structure, cooperation between face and the face is accomplished in the fixed chucking of structure on the axial, for original cylindricality locating pin and reference column, structure complex interference nature is better, the stability of structure is better.

In another example as shown in fig. 3 and 8, a clamping column 19 matched with the limiting surface is arranged on the first positioning column, in this structure, the positioning column and the positioning pin are matched in space through the matched clamping column, the clamping degree of the positioning column and the positioning pin is better, the spatial layout is better, and the stress uniformity is better;

wherein, the card post is provided with the toper fixed orifices 20 with injecing screw matched with in the one side that deviates from mutually with the plane of injecing, under this kind of structure, conical screw promotes interchangeable head module rotatory, so that the locating surface contacts and fastens with the plane of injecing of locating pin, in concrete implementation, through the fixed orifices of the toper structure that sets up on the card post, its effect lies in only stretching into through the screw and has propulsive effort, make the reference column produce rotatoryly in injecing the inslot, carry out supplementary axial positioning to it simultaneously, make interchangeable head module get into the back chucking on vertical space, interchangeable head module can not separate with the drilling rod under the effect of gravity, conical orifice and conical screw design realize the axial fixity of interchangeable head module in this scheme promptly.

In another example, as shown in fig. 1, 9-10, one end of the drill bit is oppositely provided with two second positioning pillars 22 which are matched with each other and are used for connecting the drill bit with the replaceable head module, so that the connection stability of the drill bit is better in work, and the rotation stress in work can be uniformly transmitted to the drill body;

the second limiting groove 23 is arranged at one end of the replaceable head module and can be used for the second positioning column to extend into, the two sides of the second limiting groove 23 are provided with third chip removing grooves 25 communicated with second chip removing grooves 24 on the drill rod, so that the second limiting groove is in a dovetail shape in space, in the structure, the connection between the parts is realized through the matching of the second limiting groove and the second positioning column, and the chip removing operation in the drilling process can be completed through the spatial matching of the chip removing grooves in the later period of the structure due to the structural design of the two chip removing grooves;

the opposite two sides of the second positioning column are provided with fourth chip removal grooves 26 matched with the drill tip, and the fourth chip removal grooves have the functions of completing excessive chip removal of the drill tip and the drill rod and ensuring the smoothness of drilling;

the second positioning column is in interference fit with the second limiting groove and is used for being in interference fit (under the interference fit, the maximum outer diameter of the positioning column is configured to be slightly larger than the maximum inner diameter of the limiting groove, the positioning column and the second limiting groove are connected through applying a positioning external acting force, and the structural stability after the connection is ensured), so that the stability of the fit between the second positioning column and the second limiting groove is better, namely the stability after the connection and the insertion between structural members are enabled through the interference fit.

In another example, as shown in fig. 9 and 11, the bottom of the second positioning column is provided with a protruding clamping part 27 on at least one side edge matched with the fourth chip groove, in this structure, the edge of one side of the bottom of the second positioning column is larger than the bottom of the second limiting groove, and the position of the edge is matched with the rotating direction when the second positioning column is installed, so that the clamping limitation on the component is completed;

the edge of the bottom of the second limiting groove is provided with a groove 28 matched with the clamping part, on the premise that the second positioning column is in interference fit with the second limiting groove, the problem that the connection cannot be carried out can occur due to the matching of the protruding part of the second positioning column and the second limiting groove, the protruding clamping part can be just clamped into the groove by arranging the groove at the bottom of the second limiting groove, so that under the condition that the interference between the protruding clamping part and the groove is reduced after the second limiting groove is used for a long time, the protruding clamping part and the groove can be further connected and fixed by matching, the fixing and the stability of the protruding clamping part and the groove in the longitudinal direction and the horizontal direction are ensured, meanwhile, in the actual operation, due to the structural design of the third chip groove and the fourth chip groove, the two can have staggered spaces when being installed, so that the head module and the replaceable bit are vertical in space when being installed, and the fourth chip groove on the bit has a vertical avoiding space, the second positioning column can extend into the second limiting groove under the action of external force, and due to the action of the third chip groove, the protruding clamping part is not in contact with the third limiting groove temporarily in space, and the clamping part can rotate into the groove through the rotating drill point to complete fixed connection of the second positioning column and the third limiting groove.

As shown in fig. 9, in another example, the drill tip top is provided with a mounting groove 29 corresponding to the mounting wrench, and in this structure, the mounting groove can extend into the mounting groove through two ends of the wrench, so that the drill tip can be rotatably mounted in the limiting groove by the rotating wrench, the matching of the structural member is completed, and when the drill tip is dismounted, the drill tip can be rotated reversely by the wrench, the positioning effect meets the use requirement, and the positioning effect is better.

In another example, as shown in fig. 9-11, the drill tip is provided with a fixing surface 30 matching with the rotation mounting direction thereof on the side meeting with the third chip groove;

the drill body is provided with a positioning groove 31 matched with the fixing surface;

wherein, the stationary plane one side is provided with the fixed point 32 that the radian is the biggest, be provided with the backstop portion 33 that blocks the fixed point on the constant head tank, under this kind of structure, through stationary plane and constant head tank cooperation, further prescribe the drill point in space, prescribe a limit to its rotatory position through the fixed point position of matched with between the two simultaneously, prevent it at rotatory in-process simultaneously, the drill point receives the problem that the stability of being connected of rotational action power and drill body receives the influence, the deformation that takes place is to the influence that connection stability caused, in this kind of scheme, prescribe a limit to the reference column with prescribing a limit the groove through the structure to supplement, make the structural stability of equipment good.

The above scheme is merely illustrative of a preferred example, and is not limiting. When the invention is implemented, appropriate replacement and/or modification can be carried out according to the requirements of users.

The number of apparatuses and the scale of the process described herein are intended to simplify the description of the present invention. Applications, modifications and variations of the present invention will be apparent to those skilled in the art.

While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.

Claims

1. A split drilling tool, comprising:

2. The split drilling tool of claim 1, wherein the chisel edge has cooperating minor and major cutting edges at positions extending to either side of the bit body;

3. The split drilling tool according to claim 1, wherein the reamer is configured in a polygonal structure, and a circular arc-shaped back angle is provided at the top of one side of the reamer which is matched with the hole wall, so as to form a smoothing edge which supports the hole wall in space;

4. The split drilling tool according to claim 1, wherein each first limiting groove is provided with a positioning pin which is matched with one side surface of the first positioning column;

5. The split drilling tool according to claim 1, wherein the first positioning column is provided with a clamping column matched with the limiting surface;

6. The split drilling tool according to claim 1, wherein one end of the drill bit is provided with two second positioning columns which are matched with each other oppositely;

7. The split drilling tool according to claim 1, wherein the second positioning column bottom is provided with a protruding clamping part on at least one side edge matched with the fourth chip groove;

8. The split drilling tool according to claim 1, wherein the top of the drill tip is provided with opposite mounting grooves for fitting with a mounting wrench.

9. The split drilling tool according to claim 1, wherein the drill tip is provided with a fixing surface matched with the rotation installation direction of the drill tip at the side combined with the third chip discharge groove;