CN108356329A - A kind of side set BTA drill bits and its manufacturing method based on hot investment casting structure of the cutter body - Google Patents
A kind of side set BTA drill bits and its manufacturing method based on hot investment casting structure of the cutter body Download PDFInfo
- Publication number
- CN108356329A CN108356329A CN201810123207.6A CN201810123207A CN108356329A CN 108356329 A CN108356329 A CN 108356329A CN 201810123207 A CN201810123207 A CN 201810123207A CN 108356329 A CN108356329 A CN 108356329A
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- Prior art keywords
- tooth
- cutter
- side set
- gib block
- drill bits
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/04—Angles, e.g. cutting angles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/20—Number of cutting edges
- B23B2251/202—Three cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/40—Flutes, i.e. chip conveying grooves
Abstract
The invention discloses a kind of side set BTA drill bits and preparation method thereof based on hot investment casting structure of the cutter body, side set BTA drill edges are in two-sided distributed fault dentate, two gib blocks are in staggered distribution in the peripheral circumferential of cutter hub, in practical drilling process, on the one hand hole wall caused by avoiding being in direct contact of chip and hole wall loses, on the other hand support and the guiding role realized to drill bit are contacted with the face of hole wall by gib block arc surface, simultaneously by the extruding of gib block and hole wall come balanced cutting power, to realize self- steering when drilling, then ensure that processed hole has good straightness, circularity and surface roughness, in addition unique design cutter tooth position and angle and channel of chip removal and shank structure are gone back.
Description
Technical field
The present invention relates to a kind of side set BTA drill bits and its manufacturing method based on hot investment casting structure of the cutter body, belong to deep hole
Drill Techniques field.
Background technology
The application of Deep-Hole Drilling Technology is very extensive, has almost spread all processing manufacturing industries, such as aerospace industry, ship
Oceangoing ship process industry, nuclear industry, generating equipment, Petro-Chemical Machinery etc..In deep hole machining field, BTA depth drills are in one kind
Chip removal deep-hole drilling cutters, because of its unique structure design and special with good processing quality, the processing performance of stabilization etc.
Property, it has also become the deep hole processing method generally used at present.
One of BTA depth drill types are monodentate BTA drill bits, and monodentate BTA drill bits stud with 3 hard alloy on cutter hub
Piece, wherein a piece of is cutting edge, and grinds one or two point of bits platform in the flank of cutting edge, in addition two panels is gib block.It is single
Tooth BTA drill bits are since the difference of its channel of chip removal is divided into as single bits channel design and double chip removing channel design, but this brill
The size of the chip removal mouth of head is small, and size and form to chip have very high requirement, and are not easy chip breaking.
But it is found in the process in intermediate diameter hole, monodentate BTA is bored it is difficult to ensure that suitable chip width, then leads
The phenomenon that causing chip to block chip removal mouth occurs often, therefore produces side set BTA drill bits by the optimization of monodentate BTA drill bits in recent years,
Side set BTA drill bits are divided into because of the difference of its cutter tooth and cutter hub connection relation as welding blade structure and machine clip variable-position blade
Package assembly.Side set BTA bit wings tooth rim can effectively reduce the normal pressure on gib block to being dislocatedly distributed, and ensure cutting
Width is suitable, chip removal is smooth, but it is not applicable for the gun drilling of small-bore.
Currently, BTA drill bits cutter hub mainly adds structure using bar machine, cutting ability is poor, can not difficult processing processing material
The precision deep bore of material.Although side set BTA drill bits also have using body portion essence casting, then are welded on each cutter tooth and guiding strip portions
Structure together, and requirement of this side set BTA drill bits to cutter tooth parameters precision is very high, and secondary sharpening is also cumbersome.
Integral precision casting shapes and has the side set BTA drill bits of good comprehensive cutting ability also in pilot development rank
How section, improve the structure design and manufacture, manufacture craft of side set BTA drill bits, to solve cutter tooth, gib block in the prior art
With straightness, circularity and the surface roughness in cutter hub monolithic molding difficulty, the processing of big L/D ratio deep hole difficulty and the hole processed
The problem of difference, is the key subjects that this field is urgently captured.
Invention content
To solve the above-mentioned problems, the present invention provide a kind of side set BTA drill bits based on hot investment casting structure of the cutter body and its
Manufacturing method, side set BTA drill edges are in two-sided distributed fault dentate, and two gib blocks are in staggered distribution in the peripheral circumferential of cutter hub
On, in practical drilling process, hole wall caused by the one hand avoiding being in direct contact of chip and hole wall loses, on the other hand logical
It crosses gib block arc surface and is contacted with the face of hole wall and realize support to drill bit and guiding role, while passing through gib block and hole wall
It squeezes and carrys out balanced cutting power, to realize self- steering when drilling, then ensure that processed hole has good straightness, circle
In addition degree and surface roughness are gone back unique design cutter tooth position and angle and channel of chip removal and shank structure, are thus completed
The present invention.
Therefore, first aspect present invention, provides a kind of side set BTA drill bits, including external tooth, centre tooth, center tooth, first leads
To item, cutter hub and the second gib block.
Wherein, external tooth, centre tooth and center tooth are the cutter tooth that radial distribution mutually staggers；Gib block is in cutter hub peripheral circumferential
On be in staggered distribution, the position angle of the first gib block in 180 °~190 °, in 80 °~90 ° lead by the position angle of the second gib block
To the cutter hub of item and integral precision casting by being welded together.
In the present invention, the width of three cutters tooth is set so that the working width of three cutters tooth distributes on half of aperture, right
Cutter tooth and/or its working width part are widened so that have certain overlap joint, i.e. overlay capacity between cutter tooth, and be equipped on the outside of external tooth
Sizing sword.
In the present invention, design the blade of cutter tooth so that centre tooth highest, center tooth are taken second place, and external tooth is minimum, and external tooth and
The blade of center tooth is tilted to axis direction is tiltedly upper, and center teeth directional circumferencial direction is tiltedly upper to be tilted.
The channel of chip removal of side set BTA drill bits provided by the invention includes mainly two falling in fan-segmentation of cutter hub upper end
Cone space and the cylindrical discharging opening of back taper lower end, wherein big channel of chip removal sector open closes on external tooth and centre tooth, float
Bits channel sector open closes on center tooth, and fillet is designed in the edge of channel of chip removal opening.
The shank of the side set BTA drill bits is provided with square thread and double donsole structures.
Second aspect of the present invention provides a kind of method of the above-mentioned side set BTA drill bits of manufacture, includes the following steps：
1) cutter hub, position of the head with installation cutter tooth and gib block, are made；
2), together with cutter hub forming drill shank；
3) channel of chip removal, is processed；
4), cutter tooth and gib block are installed.
It is also wide to centre tooth and/or center tooth and its installation by precision casting process integral manufacturing cutter hub in step 1
Degree is widened；
In step 2, cutter hub and shank integral manufacturing are formed by precision casting process；
In step 3, it is processed into big channel of chip removal sector open closing on design at external tooth and centre tooth, is closing on center tooth
Place's design is processed into small channel of chip removal sector open；
In step 4, cutter tooth and/or gib block are installed so that three cutters tooth are radially and two gib blocks are in cutter hub
It is in staggered distribution in peripheral circumferential.
Side set BTA drill bits provided by the invention are a kind of BTA deep hole drilling cutters, avoid the straight of chip and hole wall
Hole wall loses caused by contact.Drill edge is in two-sided distributed fault dentate, and two gib blocks are in staggered distribution in the periphery circle of cutter hub
Zhou Shang contacts support and the guiding work realized to drill bit in practical drilling process by gib block arc surface with the face of hole wall
With, while by the extruding of gib block and hole wall come balanced cutting power, to realize self- steering when drilling, then added by guarantee
The hole of work has good straightness, circularity and surface roughness.
Description of the drawings
Fig. 1 is a kind of side view of side set BTA drill bits based on hot investment casting structure of the cutter body of the present invention, is structural representation
Figure；
Fig. 2 be the present invention side set BTA drill bits structural schematic diagram, be Fig. 1 in A to front view；
Fig. 3 is the front view of the side set BTA drill bits of the present invention, is the schematic diagram of cutter tooth distribution on cutter hub；
Fig. 4 is the front view of the side set BTA drill bits of the present invention, is gib block position angular dimensions schematic diagram；
Fig. 5 is the front view and side view of the side set BTA drill bits of the present invention, is channel of chip removal parameter schematic diagram；
Fig. 6 is the side view of the side set BTA drill bits of the present invention, is bit diameter parameter and shank dimensional parameters schematic diagram.
Each reference numeral is as follows：
1- external tooths
2- centre tooths
3- center tooths
The first gib blocks of 4-
5- cutter hubs
The second gib blocks of 6-
7- sizing swords
Specific implementation mode
Below by drawings and examples, the present invention is described in more detail.
First aspect present invention, provides a kind of side set BTA drill bits based on hot investment casting structure of the cutter body, and the drill bit includes outer
Tooth 1, centre tooth 2, center tooth 3, the first gib block 4, cutter hub 5 and the second gib block 6, as illustrated in fig. 1 and 2.
According to the present invention, first gib block, 4 and second gib block 6 and the cutter hub of integral precision casting pass through the company of welding
It is connected together.
The cutter tooth that the cutting tip of the side set BTA drill bits of the present invention mutually staggers distribution by three radial directions forms, cutting edge
In two-sided distributed fault dentate.Fig. 2 is from the A of Fig. 1 to front view, here it is apparent that the distribution situation of drill bit cutter tooth, wherein 1 He of external tooth
Centre tooth 2 is arranged in from outside to inside on same radial direction, and is biased to left side relative to diameter, and center tooth 3 is then located at and this
The centre position of the opposite another radius of radius, and it is biased to right side relative to above-mentioned diameter.The Position Design ensures 3 energy of center tooth
The part to be processed that enough cuttings leave after being cut by external tooth 1 and centre tooth 2, and center tooth 3 and external tooth 1 and centre tooth 2 relative to
Same diameter is biased to different directions and also contributes to keep balance and stability when drilling or cutting.
First gib block 4 and the second gib block 6 are in staggered distribution in 5 peripheral circumferential of cutter hub, as shown in Figure 2, wherein first
Gib block 4 is close to center tooth 3, and opposite with external tooth 1, the second gib block 6 is generally in the vertical direction of radial direction where three cutters tooth
On.
Preferably, the second gib block 6 and the first gib block 4 are not orthogonal radially, and are greater than 90 degree,
In, the second gib block is biased to right side with center tooth 3 relative to above-mentioned diameter, and the second gib block 6 hangs down relative to above-mentioned diameter
Histogram to, be more biased towards downside, be in same quadrant with external tooth 1 and centre tooth 2, as shown in Figure 2.
The inventors discovered that this distributed architecture of side set BTA bit cuttings part cutter tooth can improve it in drilling
Stressing conditions in journey make drilling more stablize.
According to the present invention, the width of cutter tooth will meet distribution ratio of three cutter tooth working widths on half of aperture.
For this purpose, in the preferred embodiment of the present invention, the width of three cutters tooth is set so that the working width of three cutters tooth
Being enough to distribute on half of aperture, i.e., center tooth 3 can machine away the part by being left after external tooth 1 and the cutting of centre tooth 2 completely,
Thus three cutters tooth cut formation drilling jointly.
According to the present invention, carries out part by the cutter tooth working width of facewidth distribution ratio design and widen so that mutually stagger
There are certain overlap joint, i.e. overlay capacity between cutter tooth, thus the sum of facewidth for requiring three cutters tooth is more than the half in aperture.Such as Fig. 3 institutes
Show, set the width of external tooth 1 as d, the width of centre tooth 2 is a, and the width of center tooth 3 is c, then the sum of a, d and c at least more than
The half in aperture is more than the radius of cutting hole.This design of the present invention can ensure the good bond in drilling aperture.
In a preferred embodiment, centre tooth 2 is widened, it is made to be more than the center of circle close to one end of aperture center
Distance is τ；External tooth 1 is widened, its outer rim is made to exceed the sideline of circumference；Center tooth 3 is widened, its cutting tip is made
With the cutting tip overlap joint to external tooth 1, overlay capacity is Δ.By this design, in the feelings for ensuring drilling aperture good bond
Under condition, lead plug or cutting resistance can be further decreased.
The inventors discovered that the drill bit of the prior art formed drill when, or boring surface be susceptible to cut or
It is less smooth.
In order to overcome drawbacks described above, (i.e. external tooth 1 is close to hole wall one in the outside outside of side set BTA drill bits provided by the invention
Side) with processed hole wall crimping section, be equipped with a narrow circular arc band parallel with drill axis, i.e. sizing sword 7, as Fig. 3 with
Shown in Fig. 4.
By setting above-mentioned sizing sword 7, on the one hand can play the role of squeezing smoothing to boring surface, on the other hand,
The sizing sword 7 can also bear radial pressure and tangential friction force, and oneself of three-point circle is formed together with two gib blocks 4 and 6
Guide mechanism, the precision of balance and stability and aperture when common guarantee drill bit drilling so that the hole that is processed has excellent
Circularity and surface roughness.
According to preferred embodiment, the face that the first gib block 4 and the second gib block 6 are contacted with hole wall to be processed is set
Arc surface is counted into, it is advantageous that, on the one hand, when lead plug or cutting, the arc surface of gib block is by contacting realization pair with hole wall
The support of drill bit and guiding role, on the other hand by the extruding of gib block and hole wall come balanced cutting power, to realize drilling
When self- steering, then ensure that processed hole has good straightness, circularity and surface roughness.
In the present invention, in order to reduce lead plug or cutting resistance, and convenient for chip channel of chip removal is can smoothly enter into, needed to knife
The spatial position of tooth and cutting edge shape are specifically designed.
For this purpose, the blade of external tooth 1, centre tooth 2 and center tooth 3 is not in same level, as shown in Figure 1, its
In, 2 highest of centre tooth, center tooth 3 is taken second place, and external tooth 1 is minimum.
By designing above so that drill bit of the invention in drilling process, is being cut by the cutting edge of unbalanced distribution
Drill bit radial cutting force action can be made in hole wall side when cutting power, as shown in figure 3, the work between drill bit gib block and hole wall at this time
It is firmly mutually balanced with reaction force, so that drill bit is fed along itself axial direction, without deflection, to ensure
The hole of processing has excellent straightness.
It is configured with 90 degree of angles as described above, gib block is not radial direction, wherein the first gib block 4 deviates from
Radial direction where three cutting edges.As shown in figure 4, using 1 outer rim outermost of external tooth as starting point, is reached along clockwise direction
The outermost angle of one gib block, 4 outer rim is set as position angle β, then position angle β can within the scope of 180 °~190 ° value, preferably
181 °~189 °, more preferably 183 °~187 °, for example, 185 °.
According to the present invention, equally using 1 outer rim outermost of external tooth as starting point, reach along clockwise direction outside the second gib block 6
The outermost angle of edge is set as position angle α, then position angle α can within the scope of 80 °~90 ° value, it is preferably 81 °~89 °, more excellent
83 °~87 °, for example, 85 ° are selected as, as shown in Figure 4.
The inventors discovered that by the first and second gib blocks installation position angle as above, then the position of gib block is with regard to this
For the force analysis of invention side set BTA drill bits, Analysis on Stability, calculating and/or experiment, the most rationally, added by improvement
Straightness, circularity and the surface roughness in the hole of work play an important role.
In the present invention, the channel of chip removal of side set BTA drill bits is the unique channel that high-pressure cutting fluid carries chip discharge drill bit.
Side set BTA drill bit channel of chip removal part include mainly two of cutter hub upper end in the back taper space of fan-segmentation and
The cylindrical discharging opening of back taper lower end.
According to the present invention, back taper space is the buffer area of chip, can avoid the accumulation of chip, can be controlled by reversed cone angle
Its space size.
The channel of chip removal shape of chip removal side set BTA drill bits is the small sector bevel face of outer imperial palace in the present invention, and major diameter is
Bit body diameter, path is crumb mouth diameter, as shown in two figures of Fig. 5 or so, wherein the design parameter packet of drill bit channel of chip removal
Contain：Crumb mouth diameter D0, big channel of chip removal sector open angle θ1, the half cone of small channel of chip removal sector open angle θ 2 and circular conical surface
Angle ξ.
According to the present invention, big channel of chip removal sector open closes on external tooth 1 and centre tooth 2, and small channel of chip removal sector open
Close on center tooth 3.Such design is timely convenient for chip, smoothly enters channel of chip removal.
According to the preferred embodiment of the present invention, external tooth 1, centre tooth 2 and 3 respective blade of center tooth be not it is concordant,
Nor the intermediate projections as pen tip, but tilted to a direction, as shown in the right figure of Fig. 1 and Fig. 5, wherein 1 He of external tooth
The blade of center tooth 3 is tilted to axis direction is tiltedly upper, that is, closer to axle center, blade is higher, centre tooth 2 then to circumferencial direction it is oblique on
It tilts, that is, closer to axle center, blade is lower.In this way, when blade peak is cut, chip is along edge tilted direction to downslide
It falls, the chip generated by external tooth 1 and center tooth 3 fairly falls in big channel of chip removal sector open, and the chip generated by centre tooth 2 is just
Small channel of chip removal sector open is fallen into well.
The inventors discovered that the channel of chip removal of existing drill bit is open there are seamed edge, for example, triangle or rectangle etc. is more
Side shape access portal, and stress concentration phenomenon is susceptible at seamed edge, cutter hub intensity band is adversely affected.
For this purpose, side set BTA drill bits provided by the invention, fillet, such as Fig. 5 are all designed in the edge of channel of chip removal opening
Left figure shown in, radius of corner of the big channel of chip removal opening at center is r2, the fillet half close to the opening both ends of circumference
Diameter is respectively r1And r3；Radius of corner of the small chip removal access portal at center is r4, the fillet half close to the open end of circumference
Diameter is r5, etc..In such a way that this edge in drill bit channel of chip removal is designed to fillet, the stress at seamed edge had both been eliminated
Concentration phenomenon, and improve the intensity of cutter hub.
In order to be attached and can be effectively driven with drilling rod, need that a shank is arranged for side set BTA drill bits.
According to the present invention, the shank of the side set BTA drill bits is provided with square thread, as shown in fig. 6, cutter head body is straight
Diameter is D1, it is contemplated that the cutter head body after gib block thickness and external tooth outer rim widened section is directly D, a diameter of D in crumb mouth0, side
Pitch thread outer diameter is D3, the internal diameter of outer square thread is D4, screw thread intermediate gaps (tooth is wide) are B, including a screw thread and a sky
The distance of gap is S, including the distance in four screw threads and three gaps is P.Due to square thread helicitic texture transmission efficiency compared with
Height, therefore can realize the efficient driving of drilling rod and drill bit.
But the inventors discovered that square thread is generally odd-pitch screw, outer diameter D3With the internal diameter D of outer square thread4Ruler
It is very little not easy to control, so being difficult to even be felt relieved with square thread, connection can only be played and transmitting torque.
Therefore, it according to the present invention, in order to enable drill bit can be more easily screwed into drilling rod, and cannot interfere with each other existing
As designing the side set BTA drill bits of the present invention so that major diameter of thread D3, internal diameter D4And there are certain gaps by the wide B of tooth.
According to the present invention, the shank of the side set BTA drill bits uses double donsole structures, i.e. connection screw thread front and back have
One short cylindrical positioning surface, as shown in fig. 6, positioned at connection screw thread front end, connect with cutter head body short cylindrical positioning surface it is straight
Diameter is D2, it is located at a diameter of D of the short cylindrical positioning surface of connection screw thread rear end5。
The present invention is ensured the accurate positionin of junction cylinder and end face, made by being designed using double donsoles for drill handle part
It obtains drill bit not glance off, to realize concentricity stringent between drill bit and knife bar.
According to a second aspect of the present invention, a kind of method making above-mentioned side set BTA drill bits is provided, is included the following steps：
Step 1 produces cutter hub, position of the head with installation cutter tooth and gib block；
Step 2, together with cutter hub forming drill shank；
Step 3, processing channel of chip removal, form outer imperial palace small sector bevel face and discharging opening；
Step 4, installation cutter tooth and gib block.
In step 1 of the present invention, cutter hub is made, preferably by precision casting process integral manufacturing, makes its head with installation
The position of three cutters tooth (external tooth 1, centre tooth 2 and center tooth 3) and two gib blocks (the first gib block 4 and the second gib block 6).
In step 1, the installation width of cutter tooth is set so that the working width of three cutters tooth is enough to distribute in half of aperture
On, i.e., center tooth 3 can machine away the part by being left after external tooth 1 and the cutting of centre tooth 2 completely.Preferably, cutter tooth is installed
Width carries out part and widens so that there is certain overlap joint between the cutter tooth after installation, for example, set the installation width of external tooth 1 as d,
The installation width of centre tooth 2 is a, and the installation width of center tooth 3 is c, then the half of the sum of a, d and c at least more than aperture；It is more excellent
Selection of land widens the installation width of centre tooth 2, and it is τ so that it is more than the distance in the center of circle close to one end of aperture center；Externally
The installation width of tooth 1 is widened, its outer rim is made to exceed the sideline of circumference；The installation width of center tooth 3 is widened, it is made
Cutting tip is overlapped with the cutting tip to external tooth 1, and overlay capacity is Δ.
In step 2 of the present invention, the shank of drill bit is molded together with above-mentioned cutter hub, that is, the cutter hub and drill handle part is whole
Body is made, preferably by precision casting process integral manufacturing, to eliminate manufacture cutter hub and shank respectively after welded
The technique connect eliminates defect when cutter hub is welded with shank, ensure that the concentricity of cutter hub and shank.
In step 2, first, shank is processed into square thread, outer diameter D3, internal diameter D4, tooth width is B, including one
The distance in screw thread and a gap is S, including the distance in four screw threads and three gaps is P, and square thread total length is L4.It is excellent
Selection of land, processing major diameter of thread D3, internal diameter D4And when the wide B of tooth, there are certain intervals so that drill bit can be easily screwed into drilling rod, and
It does not generate and interferes with each other phenomenon.
In step 2, secondly, shank is processed into double donsole structures, i.e. connection screw thread front and back process one short respectively
Cylinder positioning surface, a diameter of D of the short cylindrical positioning surface of connection screw thread front end2, the short cylindrical positioning surface of connection screw thread rear end
A diameter of D5, the length of L5, the distance of two short cylindrical positioning surfaces is L3, the short cylindrical positioning surface end of connection screw thread rear end
The L that poly- cutter head body distance is2。
In step 3 of the present invention, the back taper space to form two in fan-segmentation is processed in cutter hub upper end, and then process and formed
Channel of chip removal so that high-pressure cutting fluid carries chip via the channel, and drill bit is discharged.
In step 3, first, it is processed into big channel of chip removal sector open closing on design at external tooth 1 and centre tooth 2, is being faced
Design is processed into small channel of chip removal sector open at nearly center tooth 3.Preferably, it is all designed in the edge of channel of chip removal opening
Fillet, as shown in Figure 5 in the left, radius of corner of the big channel of chip removal opening at center is r2, close to the opening two of circumference
The radius of corner at end is respectively r1And r3；Radius of corner of the small chip removal access portal at center is r4, close to the opening of circumference
The radius of corner at end is r5, etc..
In step 3, secondly, rationally design channel of chip removal shape, become outer imperial palace it is small (major diameter be bit body diameter,
Path be crumb mouth diameter) sector bevel face, the back taper space surrounded is the buffer area of chip, can be occurred to avoid chip
Accumulation, causes to overheat or even cutter tooth wrecks, influence to cut.
In step 3, it is preferable that back taper space size can be controlled by setting reversed cone angle, then added in back taper lower end
Work forms cylindrical discharging opening.As shown in figure 5, its design parameter includes：Crumb mouth (discharging opening) diameter D0, big channel of chip removal fan
Shape angular aperture θ1, small channel of chip removal sector open angle θ2And the semi-cone angle ξ of circular conical surface.
In step 4 of the present invention, cutter tooth is installed first so that three cutters tooth radially mutually stagger distribution, external tooth 1 and center
Tooth 2 is arranged in from outside to inside on same radial direction, and center tooth 3 is then located at the interposition of another radius opposite with the radius
It sets.
Preferably, the blade of external tooth 1, centre tooth 2 and center tooth 3 is not in same level, and centre tooth 2 is most
Height, center tooth 3 are taken second place, and external tooth 1 is minimum；It is highly preferred that external tooth 1, centre tooth 2 and 3 respective blade of center tooth are to a direction
It tilts, wherein external tooth 1 and the blade of center tooth 3 are tilted to axis direction is tiltedly upper, that is, closer to axle center, blade is higher, centre tooth
2 tilt to circumferencial direction is tiltedly upper, that is, closer to axle center, blade is lower, as shown in Figure 1..
According to preferred embodiment, (i.e. external tooth 1 is close to hole wall side) and processed hole wall press section on the outside of outside
Point, it is equipped with sizing sword 7.
In step 4, secondly gib block is installed so that the first gib block 4 and the second gib block 6 are in 5 peripheral circumferential of cutter hub
It is in staggered distribution, wherein the first gib block 4 is close to center tooth 3, and opposite with external tooth 1, the second gib block 6 is generally in three cutters tooth
In the vertical direction of place radial direction.
In step 4, the first gib block 4 deviates from the radial direction where three cutting edges, position angle β 180 °~
Within the scope of 190 °, preferably 181 °~189 °, more preferably 183 °~187 °, for example, 185 °；The position angle of second gib block 6
α is within the scope of 80 °~90 °, preferably 81 °~89 °, more preferably 83 °~87 °, for example, 85 °.
In the preferred embodiment of the present invention, the cutter hub of the first gib block 4 and the second gib block 6 and integral precision casting is logical
It crosses and is welded together.
The advantageous effect of side set BTA drill bits provided by the invention and its manufacturing method shows in the following areas：
(1) side set BTA drill edges of the invention are in two-sided distributed fault dentate, and two gib blocks are in staggered distribution in the outer of cutter hub
It encloses on circumference, contacts support and the guiding realized to drill bit with the face of hole wall by gib block arc surface in practical drilling process
Effect, and avoided come balanced cutting power to realize self- steering effect when drilling by the extruding of gib block and hole wall
The drill bit laterally significantly appearance of skewness is caused because cutting force is excessive in drilling process, then ensures processed hole tool
There are good straightness, circularity and surface roughness.
(2) side set BTA deep hole drills of the invention, increase the sectional area of interior channel of chip removal, avoid to a certain extent
Chip blocks the appearance of channel of chip removal phenomenon.Side set BTA drill bit channel of chip removal part includes mainly that two of cutter hub upper end are in
The back taper space of fan-segmentation and the cylindrical discharging opening of back taper lower end.Back taper space is the buffer area of chip, can avoid cutting
The accumulation of bits can control its space size by reversed cone angle.
(3) side set BTA drill bits of the invention are shaped by integral precision casting, and drill bit junction uses double donsole sides of adding
The shank structure of pitch thread.Wide there are certain gaps for major diameter of thread, internal diameter and tooth in structure design so that drill bit can be relatively light
Loose ground is screwed into drilling rod, and does not interfere with each other phenomenon.And in order to ensure the accurate positionin of junction cylinder and end face, bit sub
Portion uses double donsole designs, i.e., there are one short cylindrical positioning surfaces for connection screw thread front and back, and drill bit is made not glance off, and ensure
Stringent concentricity between drill bit and knife bar.
Above in association with preferred embodiment, the present invention is described, but these embodiments are only exemplary
, only play the role of illustrative.On this basis, a variety of replacements and improvement can be carried out to the present invention, these each fall within this
In the protection domain of invention.
Claims (10)
1. a kind of side set BTA drill bits, which is characterized in that the drill bit includes external tooth (1), centre tooth (2), center tooth (3), first leads
To item (4), cutter hub (5) and the second gib block (6).
2. side set BTA drill bits according to claim 1, which is characterized in that external tooth (1), centre tooth (2) and center tooth (3)
The cutter tooth mutually staggered for radial distribution；
First gib block (4) and the second gib block (6) are in staggered distribution in cutter hub (5) peripheral circumferential, the position of the first gib block (4)
Angle setting β is within the scope of 180 °~190 °, and the position angle α of the second gib block (6) is within the scope of 80 °~90 °, gib block and whole essence
The cutter hub of close casting is by being welded together.
3. side set BTA drill bits according to claim 1 or 2, which is characterized in that
Setting the width of three cutters tooth so that the working width of three cutters tooth distributes on half of aperture,
Preferably, cutter tooth working width part is widened so that there are certain overlap joint, i.e. overlay capacity between the cutter tooth mutually staggered,
It is highly preferred that being equipped with sizing sword (7) on the outside of external tooth (1).
4. side set BTA drill bits according to claim 1 or 2, which is characterized in that
Design the blade of cutter tooth so that centre tooth (2) highest, center tooth (3) are taken second place, and external tooth (1) is minimum；
Preferably, external tooth (1) and the blade of center tooth (3) are tilted to axis direction is tiltedly upper, centre tooth (2) to circumferencial direction it is oblique on
It tilts.
5. side set BTA drill bits according to claim 1 or 2, which is characterized in that
The drill bit has channel of chip removal, includes the two back taper spaces and back taper lower end in fan-segmentation of cutter hub (5) upper end
Cylindrical discharging opening,
Preferably, big channel of chip removal sector open closes on external tooth (1) and centre tooth (2), during small channel of chip removal sector open closes on
Raker tooth (3),
It is highly preferred that the edge in channel of chip removal opening is designed with fillet.
6. side set BTA drill bits according to claim 1 or 2, which is characterized in that the side set BTA drill bits have shank, excellent
Selection of land, shank are provided with square thread.
7. side set BTA drill bits according to claim 6, which is characterized in that shank is provided with double donsole structures.
8. the method for the side set BTA drill bits described in a kind of one of manufacturing claims 1 to 7, includes the following steps：
1) cutter hub, position of the head with installation cutter tooth and gib block, are made；
2), together with cutter hub forming drill shank；
3) channel of chip removal, is processed；
4), cutter tooth and gib block are installed.
9. according to the method described in claim 8, it is characterized in that,
In step 1, pass through precision casting process integral manufacturing cutter hub, it is preferable that add to the installation width of centre tooth (2)
Width, it is τ to make the distance that it is more than the center of circle close to one end of aperture center, widens the installation width of center tooth (3), makes it
Cutting tip is overlapped with the cutting tip to external tooth (1), and overlay capacity is Δ；
In step 2, cutter hub and shank integral manufacturing are formed by precision casting process.
10. method according to claim 8 or claim 9, which is characterized in that
In step 3, it is processed into big channel of chip removal sector open closing on design at external tooth (1) and centre tooth (2), is closing on centre
Design is processed into small channel of chip removal sector open at tooth (3)；
In step 4, cutter tooth is installed so that three cutters tooth are radially in staggered distribution, and/or, gib block is installed so that two guiding
Item is in staggered distribution in cutter hub peripheral circumferential.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810123207.6A CN108356329A (en) | 2018-02-07 | 2018-02-07 | A kind of side set BTA drill bits and its manufacturing method based on hot investment casting structure of the cutter body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810123207.6A CN108356329A (en) | 2018-02-07 | 2018-02-07 | A kind of side set BTA drill bits and its manufacturing method based on hot investment casting structure of the cutter body |
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| CN108356329A true CN108356329A (en) | 2018-08-03 |
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| CN201810123207.6A Pending CN108356329A (en) | 2018-02-07 | 2018-02-07 | A kind of side set BTA drill bits and its manufacturing method based on hot investment casting structure of the cutter body |
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| CN (1) | CN108356329A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109482930A (en) * | 2019-01-07 | 2019-03-19 | 西安石油大学 | A kind of micro- texture BTA deep hole drill and its structure preparation process |
| CN110026591A (en) * | 2019-04-22 | 2019-07-19 | 中北大学 | A kind of intelligence high intensity BTA drill bit of deep hole machining |
| CN112743128A (en) * | 2020-12-30 | 2021-05-04 | 浙江欣兴工具有限公司 | Welded BTA deep hole bores |
| CN112809047A (en) * | 2020-12-30 | 2021-05-18 | 浙江欣兴工具有限公司 | Rolling support type deep hole drill |
| CN113414594A (en) * | 2021-05-21 | 2021-09-21 | 北京理工大学 | Drilling, grinding and rolling composite BTA tool for deep hole machining and manufacturing method |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2078667U (en) * | 1990-11-12 | 1991-06-12 | 马尚德 | Deep hole drill for many kinds of steels |
| JP2006239826A (en) * | 2005-03-04 | 2006-09-14 | Yunitakku Kk | Drill head |
| CN201168805Y (en) * | 2008-03-19 | 2008-12-24 | 西安理工大学 | Soft metal ultralong deep hole processing tool bit |
| JP2011194479A (en) * | 2010-03-17 | 2011-10-06 | Takuji Nomura | Drill head for cutting deep hole |
| CN102430781A (en) * | 2011-10-27 | 2012-05-02 | 成都工具研究所有限公司 | Inner chip removal deep hole drilling tool for hard alloys |
| CN103781580A (en) * | 2011-05-16 | 2014-05-07 | 野村倬司 | Drill head for deep-hole cutting |
| CN104400080A (en) * | 2014-09-23 | 2015-03-11 | 宁波市荣科迈特数控刀具有限公司 | Deep hole drill |
| CN106925818A (en) * | 2015-12-30 | 2017-07-07 | 成都工具研究所有限公司 | Sword side set bta deep hole drilling of minor diameter three and preparation method thereof |
| CN106929734A (en) * | 2015-12-30 | 2017-07-07 | 成都工具研究所有限公司 | For aperture knife tool guide pad Hardmetal materials and preparation method thereof |
| CN206662350U (en) * | 2017-04-27 | 2017-11-24 | 株洲钻石切削刀具股份有限公司 | A kind of depth drill of adjustable diameter |
-
2018
- 2018-02-07 CN CN201810123207.6A patent/CN108356329A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2078667U (en) * | 1990-11-12 | 1991-06-12 | 马尚德 | Deep hole drill for many kinds of steels |
| JP2006239826A (en) * | 2005-03-04 | 2006-09-14 | Yunitakku Kk | Drill head |
| CN201168805Y (en) * | 2008-03-19 | 2008-12-24 | 西安理工大学 | Soft metal ultralong deep hole processing tool bit |
| JP2011194479A (en) * | 2010-03-17 | 2011-10-06 | Takuji Nomura | Drill head for cutting deep hole |
| CN103781580A (en) * | 2011-05-16 | 2014-05-07 | 野村倬司 | Drill head for deep-hole cutting |
| CN102430781A (en) * | 2011-10-27 | 2012-05-02 | 成都工具研究所有限公司 | Inner chip removal deep hole drilling tool for hard alloys |
| CN104400080A (en) * | 2014-09-23 | 2015-03-11 | 宁波市荣科迈特数控刀具有限公司 | Deep hole drill |
| CN106925818A (en) * | 2015-12-30 | 2017-07-07 | 成都工具研究所有限公司 | Sword side set bta deep hole drilling of minor diameter three and preparation method thereof |
| CN106929734A (en) * | 2015-12-30 | 2017-07-07 | 成都工具研究所有限公司 | For aperture knife tool guide pad Hardmetal materials and preparation method thereof |
| CN206662350U (en) * | 2017-04-27 | 2017-11-24 | 株洲钻石切削刀具股份有限公司 | A kind of depth drill of adjustable diameter |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109482930A (en) * | 2019-01-07 | 2019-03-19 | 西安石油大学 | A kind of micro- texture BTA deep hole drill and its structure preparation process |
| CN110026591A (en) * | 2019-04-22 | 2019-07-19 | 中北大学 | A kind of intelligence high intensity BTA drill bit of deep hole machining |
| CN112743128A (en) * | 2020-12-30 | 2021-05-04 | 浙江欣兴工具有限公司 | Welded BTA deep hole bores |
| CN112809047A (en) * | 2020-12-30 | 2021-05-18 | 浙江欣兴工具有限公司 | Rolling support type deep hole drill |
| CN112809047B (en) * | 2020-12-30 | 2022-07-19 | 浙江欣兴工具股份有限公司 | Rolling support type deep hole drill |
| CN113414594A (en) * | 2021-05-21 | 2021-09-21 | 北京理工大学 | Drilling, grinding and rolling composite BTA tool for deep hole machining and manufacturing method |
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