CN215941601U - Drill point and drilling tool - Google Patents

Abstract

The utility model belongs to the technical field of hole machining cutters and discloses a drill point and a drilling tool. The drill point comprises a needle body and a chip groove, wherein the needle body consists of a tip part and a drill body, a first blade surface is arranged at the connecting position of the drill body and the tip part, the first blade surface is in a conical surface or arc curved surface shape, and the chip groove is positioned on the edge of the top of the side wall on the first blade surface to form a smoothing blade. The polishing efficiency of the polishing blade can be improved by arranging the polishing blade on the conical surface, the polishing blade is arranged on the arc curved surface, the generation of tool marks in the polishing process can be reduced, the roughness of the hole wall is reduced, and the polishing effect is improved.

Description

Drill point and drilling tool

Technical Field

The utility model relates to the technical field of hole machining cutters, in particular to a drill point and a drilling tool.

Background

At present, in order to reduce the roughness of the hole wall of a drill point after machining, the chip removal performance of the drill point is improved, so that the chips cut by a cutting edge in the cutting process are discharged in time, the friction between the chips and the hole wall is reduced, and the roughness of the hole wall is indirectly reduced. In the prior art, the technical means for improving the chip removal performance of the drill point mostly comprises increasing the spiral angle of a chip removal groove and reducing the core thickness, but after the spiral angle is increased, the thread pitch is correspondingly reduced, the total length of the chip removal groove is prolonged, the path of chips in the chip removal process is increased, the contact area and the contact time of the chip removal groove and the chips are increased, the abrasion of the chips on the drill point is more serious, the abrasion speed of the drill point is increased, the service life of the drill point is shortened, the core thickness of the drill point is reduced, and the drill point is easy to break.

Therefore, a drill point is needed to solve the above technical problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a drill point, which can solve the problem that the wall roughness of a hole machined by the existing drill point is large.

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

a drill point comprises a needle body, wherein the needle body comprises a tip part and a drill body, a chip groove spirally extending around the axial direction of the needle body is arranged on the needle body, the chip groove extends from the tip part to the drill body, a first blade surface is arranged at one end, connected with the tip part, of the drill body, at least part of the chip groove is positioned on the first blade surface, and the top edge of the side wall, positioned on the first blade surface, of the chip groove forms a finishing edge;

the first cutting surface is a revolution surface, a generatrix of the revolution surface is a straight line, and the distance between the straight line and the axis of the drill body is gradually increased along the direction departing from the tip; or the generatrix of the revolution surface is a circular arc line protruding towards the outer side of the drill body.

Preferably, two chip grooves are symmetrically arranged on the needle body, and the tops of two opposite side walls of the two chip grooves, which are close to the tip, are both provided with a flat edge.

Preferably, the axial cross-sectional length of the first facet is 1-1.5 mm.

Preferably, the helical angle of the chip groove is 25-45 degrees.

Preferably, the angle between the straight line and the axis of the drill body is 1.5-3 degrees.

Preferably, the needle body is made of stainless steel or hard alloy material.

Preferably, the tip angle of the tip is 120 ° to 165 °.

Preferably, the drill pin further comprises a mounting rod, the mounting rod comprising:

a handle bar;

the transition rod is arranged at one end of the handle rod, one end of the transition rod is fixedly connected with the handle rod, and the other end of the transition rod is used for installing the needle body.

Preferably, the radius of the circular arc line is smaller than that of the needle body by 0.005-0.010 mm.

A drilling tool comprises a machine body and the drill point.

The utility model has the beneficial effects that:

according to the utility model, the trimming blade is arranged on the first blade surface which is a revolution surface, and the generatrix of the revolution surface is an arc line protruding towards the outer side of the drill body, so that the trimming blade directly participates in cutting in the form of an arc, the generation of tool marks in the trimming process of the trimming blade can be reduced, and the trimming effect is improved; or the generatrix of the straight line revolution surface is a straight line, and the distance between the straight line and the axis of the drill body is gradually increased along the direction departing from the tip part, so that the polishing blade directly participates in cutting in a straight line mode, and the polishing efficiency can be improved.

Drawings

FIG. 1 is a schematic structural diagram of a drill point according to an embodiment of the present invention;

FIG. 2 is a schematic view of a tip of a drill point at a viewing angle according to an embodiment of the present invention;

FIG. 3 is a schematic view of a tip of a drill point from another perspective according to an embodiment of the present invention;

FIG. 4 is a schematic view of a drill point according to an embodiment of the present invention, wherein the drill point is fixed to a mounting rod;

fig. 5 is a schematic structural diagram of a tip of a drill point provided in a second embodiment of the present invention;

fig. 6 is a schematic structural diagram of a tip of a drill point provided in the second embodiment of the present invention from another viewing angle.

In the figure:

1. a needle body; 11. a tip portion; 111. a main cutting edge; 12. drilling a body; 121. a first facet; 1211. smoothing the edge; 122. a second facet; 123. a third facet; 124. a fixed part; 13. a chip groove; 131. an auxiliary chip groove;

2. mounting a rod; 21. a handle bar; 22. a transition rod; 221. a first transition bar; 222. a second transition bar; 223. and a third transition bar.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

At present, in order to improve the abnormal roughness of the hole wall, the technical means is that the helical angle of a chip groove is increased, the core thickness of a drill point is reduced, the helical angle of the chip groove is increased, the thread pitch is correspondingly reduced, the total length of the chip groove is prolonged, the path of chips in the discharging process is increased, the contact area and the contact time of the chip groove and the chips are increased, the abrasion of the chips on the drill point is more serious, the abrasion speed of the drill point is accelerated, and the service life of the drill point is shortened; reducing the core thickness increases the chip space of the drill bit, but makes the drill bit more susceptible to breakage.

Example one

As shown in fig. 1, the present embodiment provides a drill point with a wiper edge, the drill point includes a needle body 1, the needle body 1 includes a tip portion 11 and a drill body 12, a main cutting edge 111 is disposed on the tip portion 11, and the main cutting edge 111 can play a role of cutting off materials. The pin body 1 is provided with a chip groove 13 spirally extending from the tip part 11 along the axial direction of the pin body 1, the chip groove 13 is used for discharging chips generated during cutting of the main cutting edge 111, the chips cut off by the main cutting edge 111 are discharged in time, friction between the chips and a hole wall can be reduced, and roughness of the hole wall is reduced.

In order to further reduce the roughness of the hole wall without changing the helix angle and the core thickness, the drill body 12 is provided with a wiper 1211, which has a function of wiping the hole wall to reduce the roughness of the hole wall.

Specifically, a first edge surface 121 is arranged at one end of the drill body 12 connected with the tip 11, part of the chip grooves 13 are arranged on the first edge surface 121, the top edges of the side walls of the chip grooves 13 on the first edge surface 121 form the smoothing edge 1211, it can be understood that the first edge surface 121 is a revolution surface formed by the rotation of the smoothing edge 1211 around the axis of the needle body 1, the generatrix of the revolution surface is a straight line, and the distance between the straight line and the axis of the needle body 1 is gradually increased along the direction departing from the tip 11, so that the smoothing edge 1211 can participate in the cutting of the hole wall, the smoothing effect of the smoothing edge 1211 is improved, and the smoothing efficiency is improved.

As shown in fig. 2, by providing the wiper 1211 on the drill point, the part of the drill point participating in cutting is changed from one edge to two edges, in the process of hole machining using the drill point in the present embodiment, after the main cutting edge 111 cuts most of the material, a small amount of margin is cut by the wiper 1211, and the wiper 1211 controls the size of the hole diameter finally, so that the wear rate of the main cutting edge 111 is reduced, the wiping effect is improved, and the roughness of the hole wall is reduced.

Preferably, two chip grooves 13 are symmetrically arranged on the needle body 1, the two chip grooves 13 are in a double-helix shape and extend along the axial direction of the needle body 1, and the two chip grooves 13 which are symmetrically arranged can keep the drill point coaxial in the rotation process, so that the drill point cannot shake in the processing process, and the processed aperture is prevented from deviating. Meanwhile, the two chip grooves 13 can quickly discharge chips generated by cutting the main cutting edge 111 and the smoothing edge 1211, and the problem of abnormal hole wall roughness caused by friction between the chips and the hole wall is prevented.

Furthermore, the needle body 1 is further provided with a second blade surface 122 and a third blade surface 123, the second blade surface 122 is a cylindrical surface, one end of the second blade surface 122 is connected with the first blade surface 121, and the second blade surface 122 can perform a secondary grinding function on the hole wall which is finished by the finishing blade 1211, so that the roughness of the hole wall is further reduced, and the finishing effect is improved.

Furthermore, the third edge surface 123 is a cylindrical surface, the diameter of the third edge surface 123 is smaller than that of the second edge surface 122, one end of the third edge surface 123 is connected to the second edge surface 122, and an annular groove is formed at the joint of the third edge surface 123 and the second edge surface 122, so that the third edge surface 123 is not in contact with the hole wall, the friction area between the drill body 12 and the hole wall can be reduced, and meanwhile, chips can be discharged more easily.

Further, as shown in fig. 3, the top edges of two opposite side walls of the flute 13 on the first blade surface 121 are provided with the smoothing edge 1211, so that the drill point can perform the smoothing function on the hole wall by clockwise rotation and counterclockwise rotation during the process of processing the hole.

Preferably, the axial section length of the first edge surface 121 is 1-1.5mm, and the length of the wiper 1211 participating in cutting can be reasonably controlled by reasonably controlling the length of the axial section of the first edge surface 121, so that the wiper 1211 can achieve the best wiping effect.

Further, in this embodiment, the axial cross-sectional length of the first blade surface 121 is 1.3mm, which can avoid the problem that the length of the wiper 1211 located on the first blade surface 121 participating in the cutting is small and the wiping effect is poor, and can also avoid the phenomenon that the length of the wiper 1211 participating in the cutting is too long, the contact area between the wiper 1211 and the hole wall is large, the heat generated during the cutting is large, and the hole is processed badly due to the generation of the built-up edge.

Preferably, the spiral angle range of the chip groove 13 is 25-45 degrees, and a proper spiral angle can be selected according to different materials processed by the drill point, so that chips can be smoothly discharged from the chip groove 13, the friction of the residual chips in the hole on the hole wall is reduced, the roughness of the hole wall is reduced, and the polishing effect is improved.

It will be appreciated that increasing the helix angle of the flutes 13 increases the chip holding capacity of the needle body 1, reduces the friction of the chips with the wall of the bore, and that decreasing the helix angle of the flutes 13 allows faster chip evacuation from the bore, while reducing the cutting resistance.

Specifically, the angle of the spiral angle of the chip groove 13 in this embodiment is 35 °, which can avoid the problems that the total length of the chip groove is prolonged, the contact area and the contact time between the chip groove and the chips are increased, the abrasion of the chips to the drill point is more serious, the abrasion speed of the drill point is high, and the service life of the drill point is short due to the fact that the spiral angle of the chip groove is too large and the thread pitch is reduced, and can also enable the drill point to have certain chip containing capability and chip removal capability, reduce the friction between the chips and the hole wall, and improve the polishing effect of the polishing blade 1211.

Preferably, the wiper 1211 rotates around the axial direction of the needle body 1 to form a revolution surface, the included angle between the generatrix of the revolution surface and the axis of the drill body 12 is 1.5-3 °, the contact area between the wiper 1211 and the hole wall is increased by increasing the included angle, the wiping effect is improved, the contact area between the wiper 1211 and the hole wall can be reduced by reducing the included angle, the abrasion speed of the wiper 1211 is reduced, and the service life of the drill point is prolonged.

Further, the angle of contained angle is 2.5 among this embodiment, can guarantee to repair the long drill-point live time of the prerequisite of light effect under.

Preferably, the needle body 1 in this embodiment is made of stainless steel or hard alloy material, wherein the stainless steel material has good corrosion resistance and heat resistance, can guarantee that the needle body 1 can not be corroded, prolongs the life of the needle body 1, and the hard alloy has the advantages of high hardness, wear resistance and high strength, so that the drill point is firmer, and meanwhile, the drill point can be made of harder materials, and the applicability and the practicability of the drill point are improved.

Furthermore, the needle body 1 in the embodiment is made of tungsten steel, the tungsten steel has high hardness, good wear resistance, good strength and toughness, and a series of excellent performances such as heat resistance, corrosion resistance and the like, particularly the high hardness and the wear resistance of the tungsten steel, the tungsten steel is basically kept unchanged even at the temperature of 500 ℃, the tungsten steel still has high hardness at the temperature of 1000 ℃, the service life of the drill point can be prolonged, and the application range of the drill point is wider.

Preferably, the angle of the sharp corner of the upper tip 11 of the needle body 1 is in the range of 120 ° to 165 °, and an appropriate angle of the sharp corner may be selected according to a material to be punched, the smaller the angle of the sharp corner, the sharper the main cutting edge 111 but the lower the strength of the tip of the main cutting edge 111, and the larger the angle of the sharp corner, the higher the strength of the tip of the main cutting edge 111 but the lower the cutting efficiency.

Furthermore, the angle of the sharp corner in this embodiment is 145 °, which not only ensures the sharpness and machining efficiency of the main cutting edge 111, but also improves the strength of the nose.

Preferably, as shown in fig. 4, in order to facilitate the fixing of the drill point on the working platform, the drill point further comprises a handle 21 and a transition rod 22, the transition rod 22 is connected to one end of the handle 21 and is fixedly connected to the handle 21, and the fixing portion 124 of the needle body 1 is fixedly connected to the transition rod 22.

Optionally, the transition rod 22 includes a first transition rod 221, a second transition rod 222, and a third transition rod 223, the first transition rod 221 and the third transition rod 223 are in a circular truncated cone shape, the second transition rod 222 is in a cylindrical shape, diameters of the first transition rod 221 and the third transition rod 223 gradually decrease, a smaller diameter surface of the third transition rod 223 is the same as a diameter of the needle body 1 and is fixedly connected with the needle body 1, the needle body 1 and the mounting rod 2 are coaxial, stability of the needle body 1 in a rotation process is guaranteed, that is, the connection of the handle rod 21 with a larger diameter to the drill with a smaller diameter is achieved.

In other embodiments, only one transition rod 22 may be provided, i.e., the transition of the shank 21 from the larger diameter to the smaller diameter is within the scope of the present embodiment.

Optionally, the mounting rod 2 is processed in an integrated forming mode, so that processing steps are simplified, and production efficiency is improved.

Alternatively, the mounting rod 2 is made of stainless steel or hard alloy material, the stainless steel has the characteristics of wear resistance and corrosion resistance, the mounting rod 2 can not be easily corroded, the hardness of the hard alloy is high, the firmness of the mounting rod 2 can be further improved, and the mounting rod 2 is made to be stronger.

Specifically, the mounting rod 2 in the present embodiment is made of tungsten steel, which has high hardness and high strength, and can prolong the service life of the mounting rod 2.

Optionally, when the material of needle body 1 is inconsistent with the material of installation pole 2, can adopt the welded mode to fix needle body 1 on installation pole 2, the fastness of needle body 1 and installation pole 2 can be guaranteed to the welded processing mode, can also improve machining efficiency.

Preferably, in the embodiment, the mounting rod 2 and the drill point are both made of tungsten steel, and an integrally formed processing mode is adopted, so that the processing efficiency can be improved, the strength and the toughness can be ensured, and the service life of the drill point is prolonged.

Example two

The difference between the drill point with the wiper blade in this embodiment and embodiment 1 is that the revolving surface formed by the wiper blade 1211 revolving around the axis of the needle body 1 is the first blade surface 121, the first blade surface 121 is a spatial curved surface, the generatrix of the revolving surface is an arc line protruding to the outside of the drill body 12, and by disposing the wiper blade 1211 on the spatial curved surface, the wiper blade 1211 can wipe the hole wall in an arc line manner, thereby avoiding the generation of tool marks and facilitating the improvement of the wiping effect.

It can be understood that, before the drill point is provided with the chip groove 13, an arc curved surface shape is ground at the position of the first edge surface 121, then the chip groove 13 is formed by processing the drill point, the top edge of the side wall of the chip groove 13 on the first edge surface 121 forms the smoothing edge 1211, as shown in fig. 5, the radius of the arc curved surface of the smoothing edge 1211 is larger than that of the tip 11, when the drill point works, the main cutting edge 111 and the smoothing edge 1211 rotate around the axis of the drill point, the revolution surface formed by the main cutting edge 111 is in a conical surface shape, and the revolution surface formed by the smoothing edge 1211 is in an arc curved surface shape, so that the smoothing edge 1211 participates in the earth boring cutting and can perform the earth boring smoothing function.

Preferably, the radius of the circular arc line is 0.005-0.01mm smaller than that of the needle body 1, so that the wiper 1211 can participate in the cutting of the hole wall, and the wiping effect of the wiper 1211 can be improved.

Preferably, as shown in fig. 5 and 6, in order to further reduce the friction between the drill body 12 and the hole wall and improve the chip removal performance of the drill point, the first blade surface 121 and the second blade surface 122 are provided with auxiliary chip removal grooves 131, and the depth of the auxiliary chip removal grooves 131 is smaller than that of the chip removal grooves 13, so that the drill point is not easily broken.

Optionally, a secondary chip removal groove 131 may be formed in the middle of the second blade surface 122 and the third blade surface 123, the width of the secondary chip removal groove 131 is smaller than the width of the second blade surface 122 or the third blade surface 123, the spiral direction and the extending direction of the secondary chip removal groove 131 and the chip removal groove 13 are the same, and the chip removal performance of the drill bit may be further increased by adding the secondary chip removal groove 131, so that the chips are easier to be discharged out of the drill hole, and the roughness of the hole wall is reduced.

Optionally, the two auxiliary chip removal grooves 131 are symmetrically arranged on two side walls of the drill body 12, so that the chip removal performance of the drill point is improved, the friction area between the drill body 12 and the hole wall is reduced, and the roughness of the hole wall is further reduced.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the utility model. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims (10)

1. A drill point, comprising a needle body (1), wherein the needle body (1) comprises a tip portion (11) and a drill body (12), a flute (13) spirally extending around the axial direction of the needle body (1) is arranged on the needle body (1), the flute (13) extends from the tip portion (11) to the drill body (12), characterized in that one end of the drill body (12) connected with the tip portion (11) is provided with a first edge surface (121), at least part of the flute (13) is positioned on the first edge surface (121), and the top edge of the side wall of the flute (13) positioned on the first edge surface (121) forms a finishing edge (1211);

the first cutting surface (121) is a revolution surface, the generatrix of the revolution surface is a straight line, and the distance between the straight line and the axis of the drill body (12) is gradually increased along the direction departing from the tip (11); or the generatrix of the revolution surface is a circular arc line which protrudes to the outer side of the drill body (12).

2. The drill bit according to claim 1, characterized in that two chip grooves (13) are symmetrically arranged on the pin body (1), and the two chip grooves (13) are formed with a wiper edge (1211) near the tops of two opposite side walls of the tip (11).

3. The drill bit as claimed in claim 1, characterized in that the axial cross-sectional length of the first facet (121) is 1-1.5 mm.

4. Drill bit according to claim 1, characterized in that the helix angle of the flutes (13) is 25 ° -45 °.

5. The drill bit according to claim 1, characterized in that the angle between the straight line and the axis of the drill body (12) is 1.5 ° -3 °.

6. Drill point according to any of claims 1-5, characterized in that the needle body (1) is made of stainless steel or cemented carbide material.

7. A drill bit according to any of the claims 1-5, characterized in that the tip angle of the tip (11) is 120 ° -165 °.

8. Drill point according to any of claims 1-5, characterized in that the drill point further comprises a mounting rod (2), the mounting rod (2) comprising:

a handle (21);

the transition rod (22) is arranged at one end of the handle rod (21), one end of the transition rod (22) is fixedly connected with the handle rod (21), and the other end of the transition rod is used for installing the needle body (1).

9. Drill point according to any of claims 1-5, characterized in that the radius of the circular arc line is 0.005-0.010mm smaller than the radius of the needle body (1).

10. A drilling tool comprising a body, further comprising a drill bit according to any one of claims 1-9, the drill bit being mounted to the body.

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