CN107717138A - A kind of dual clamping mode of worm gear fly cutter - Google Patents
A kind of dual clamping mode of worm gear fly cutter Download PDFInfo
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- CN107717138A CN107717138A CN201610649698.9A CN201610649698A CN107717138A CN 107717138 A CN107717138 A CN 107717138A CN 201610649698 A CN201610649698 A CN 201610649698A CN 107717138 A CN107717138 A CN 107717138A
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- fly cutter
- knife bar
- screw
- positioning
- worm gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23F—MAKING GEARS OR TOOTHED RACKS
- B23F23/00—Accessories or equipment combined with or arranged in, or specially designed to form part of, gear-cutting machines
- B23F23/12—Other devices, e.g. tool holders; Checking devices for controlling workpieces in machines for manufacturing gear teeth
- B23F23/1237—Tool holders
- B23F23/1243—Hob holders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23F—MAKING GEARS OR TOOTHED RACKS
- B23F11/00—Making worm wheels, e.g. by hobbing
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- Mechanical Engineering (AREA)
- Details Of Cutting Devices (AREA)
Abstract
The present invention relates to a kind of dual clamping mode of worm gear fly cutter, drive end and the centre bore concentric with knife bar center line are provided with knife bar Partner, installation is radially provided with the middle part of knife bar and tenses the round tube hole of fly cutter, the both ends of the round tube hole are provided with counterbore, counterbore wherein close to fly cutter circle staight shank one end is provided with stretching screw, the fly cutter circle staight shank axial line is provided with the screw of connection stretching screw, the central axis of the round tube hole and excessively knife bar center line, and penetrated with centre bore, in the centrally disposed hole of positioning and clamping mechanism, under stretching screw and positioning and clamping mechanism effect, the opposite end angled end-face of positioning mandril slides into scabbling for fly cutter circle staight shank and close face contact is formed in plane, fly cutter is fastened in round tube hole, and make the cutting tip of fly cutter with work worm screw identical position.Using axial locating clip in this centre bore tightly and in round tube hole axial tightening fly cutter technical scheme, suitable cutting force or modulus are larger, the rolling cut of the worm gear at large pitch angle.
Description
Technical field
The present invention relates to a kind of dual clamping mode of worm gear fly cutter, it is mainly used in cutting force or modulus is larger, large pitch
The rolling cut of the cylindrical worm gearing transmission worm gear at angle.
Background technology
In rolling cut worm gear, because worm gear hob parameter must be consistent with the parameter of worm screw, so worm gear hob is specific aim
Strong dedicated tool, utilization rate is low, and price is high, and production cycle length use is uneconomical, and the manufacture of bull worm gear hob is more difficult,
It is very uneconomical that worm gear hob is manufactured in Single unit job lot production, at this moment can be with fly cutter come machining worm wheel, and fly cutter is substantially
It is the worm gear hob of a monodentate or number tooth, its ooth-cutting tprinciple is identical with worm gear hob.The main advantage and disadvantage of fly cutter are manufactures
Simply, cost is low, low production efficiency, but accurately uses also correct if fly cutter makes, then the worm gear precision processed is simultaneously
Not less than the precision of worm gear hob processing, so this, which is also conventional fly cutter, carrys out one of main cause of machining worm wheel.Fly cutter loads knife bar
After answer clamping reliable, it is impossible to cutting when occur slide and rotate.Knife bar is radially arranged the circular hole of installation fly cutter circle staight shank, should
The central axis in hole and excessively knife bar center line；As shown in Figure 1 for processing in, the clamping mode of involute gear fly cutter.Fly cutter
For circle staight shank in the circular hole of knife bar 1, tightening nut 3 and 4 makes round buss 2 be moved axially along the external cylindrical surface of knife bar 1, crosses round buss
The center line in 2 holes and along its axially arranged concave arc groove along fly cutter circle staight shank hold tightly, because round buss 2 will be along the outside cylinder of knife bar 1
Face moves axially, and the diameter of knife bar 1, which diminishes, influences intensity；This lever structure is simple, easy to adjust, but clamping less reliable,
Concave arc groove requires higher.Processing clamping mode of the fly cutter of large modulus worm gear on knife bar has two kinds, as shown in Figures 2 and 3, twists
Tight nut makes the circle pull bar with screw rod be moved axially in round tube hole, the concave arc groove or plane of splaying point that its column part is set
The face of scabbling of staight shank is not justified to lock fly cutter circle staight shank or fly cutter.This clamping structure clamping force is big, and fly cutter is not easy to loosen, still
The perpendicular intersection of circular hole that both clamping modes are radially arranged installation circle pull bar and fly cutter along knife bar runs through, and it is strong to weaken knife bar
Degree and rigidity, this vertical interlaced hole, manufacture are not easy, and concave arc groove shown in Fig. 2 and pitch-row require higher, are adapted to knife bar
The occasion being relatively large in diameter.Because the quantity of fly cutter on knife bar is seldom easily worn, and cutting tip is that concentrated wear comparatively fast increases again
Cutting resistance is added；Again because fly cutter rolling cut worm gear is tangential admission, when fly cutter is from incision end rolling cut to when cutting out end, fly cutter is cut
Cut sword and be cut to both sides cutting from side and cut again to opposite side, cutter tooth produces larger periodic alternation along its axial line and turned round
The circular hole of square, fly cutter circle staight shank and knife bar is that have certain gap, and between by knife bar and supported end rigidity and bearing rotary member
The influence of gap, dynamic stiffness is poor easily to cause vibration, causes fly cutter to loosen, come off or even break worm gear etc.；Particularly cutting force or
Modulus is larger, especially the fly cutter at large pitch angle, and when the machining condition of both sides cutting edge is inconsistent, above-mentioned clamping mode is all difficult to
It is competent at.
The content of the invention
It is an object of the invention to provide one kind in knife bar centre bore axial locating clip is tight and round tube hole in axial tightening snail
The positioning clamping mode of fly cutter is taken turns, is suitable for the firm clamping of cutting force or larger, large pitch angle the worm gear fly cutter of modulus.
The technical scheme is that：Knife bar is made up of the drive end with taper shank and elongated Partner, the Partner
Drive end and the centre bore concentric with knife bar center line are provided with, installation is radially provided with the middle part of knife bar and tenses the circle of fly cutter
Through hole, the both ends of the round tube hole are provided with counterbore, wherein the counterbore close to fly cutter circle staight shank one end is provided with stretching screw, it is described to fly
Screw of the knife circle staight shank axial line provided with connection stretching screw, the central axis of the round tube hole and excessively knife bar center line,
And penetrated with centre bore, it is that force application component and positioning are pushed up successively from Partner end face in the centrally disposed hole of positioning and clamping mechanism
Bar and fly cutter composition, fly cutter circle staight shank splay average face and its axial line acute angle theta opening direction towards fly cutter cutter head,
Under power collective effect caused by stretching screw and force application component, the opposite end angled end-face of positioning mandril slides into fly cutter circle staight shank
Splay and close face contact is formed on average face, fly cutter is fastened in the round tube hole of knife bar, and make the cutting portion of fly cutter cutter head
Point with work worm screw identical position.
Further technical scheme is the present invention：Plain washer is provided between the counterbore baseplane and the stretching screw,
Set between another counterbore baseplane and worm gear fly cutter cutter head positioning plane with or without positioning plain washer.
Using the technical scheme, the plain washer be placed in the supporting surface of the stretching screw and the counterbore baseplane it
Between, play increase and be connected feature contacts surface area, reduce compressive load per unit area and protection is connected piece surface and do not damaged
Bad effect.After fly cutting part wears are refaced, it such as can separately add shim liner by changing the method for positioning plain washer thickness
Or the positioning plain washer of thickness is re-replaced, or change axial position of the opposite end angled end-face of positioning mandril in knife bar centre bore
Put, with accurately adjust fly cutter transverse tooth thickness be just on the indexing cylinder of work worm screw and prevent after by cutting force towards knife bar center
Movement.
Further technical scheme is the present invention：The force application component uses band circumference styletable screw, is produced when tightening screw
Raw axial force.
Using the technical scheme, screw clamping mechanism plays clamping and reinforcement and self-locking action, is that a kind of commonly use simply may be used
The clamp system leaned on, being particularly it has the advantages that reinforcement is big, self-locking property is good, easy to use.
Further technical scheme is the present invention：The force application component uses liquid, pneumatic cylinder or electric pushrod, by liquid, gas
Pressure or electricity produce axial force, by the use of the piston rod of hydraulic cylinder or pneumatic cylinder as the terminal that exerts a force, or by the use of the push rod of electric pushrod as
Exert a force terminal.
Using the technical scheme, when the timings of compression area S mono- of piston, pressure F is directly proportional to pressure P, i.e. F=PS, increases
Pressurization can increase by force corresponding pressure, when multiple piston overlapped in series can reinforcement at double.The pressure of hydraulic oil is higher than air pressure to be permitted
It is more, therefore bore size can be more much smaller than cylinder, is not usually required to use force-increasing mechanism, so force application component structure can be made simpler
It is single compact；Liquid is incompressible, therefore the rigid big, stable working of clamping, reliable clamping, noise are small.When using electric pushrod
When, motor drives a pair of feed screw nuts that the rotary motion of motor is changed into moving along a straight line after slowing down by gear mechanism, utilize
Motor forward/backward rotation completes push pull maneuver, is by The gear deceleration and screw mechanism reinforcement and the set composite of self-locking.
Further technical scheme is the present invention：The force application component uses spring assembly, after spring stress compression uniformly
Elastic deformation, elastic force produce axial force, force application component adjusting washer or screw regulation elastic force.
Using the technical scheme, from Hooke's law, spring is when occurring elastic deformation, the elastic force F and spring of spring
Elongation (or decrement) x it is directly proportional, i.e. F=kx.K is the coefficient of elasticity of material, and it is only determined by the property of material, with
Other factors are unrelated, are to utilize its length change reinforcement.
Further technical scheme is the present invention：The force application component is positioned and is connected with knife bar centre bore, or and knife bar
Centre bore slides positioning and the connection of knife bar Partner end face.
Further technical scheme is the present invention：The screw is chosen as coarse thread or fine thread, preferably fine thread.
Using the technical scheme, fine thread has more preferable reinforcement and self-locking effect than coarse thread.
Further technical scheme is the present invention：The centre bore arrival end is 60 ° of taper holes provided with concentric centre hole.
Further technical scheme is the present invention：The force terminal end face of the force application component is provided with the large radius of hardening
Spherical Surface S r.
Further technical scheme is the present invention：It is oblique to make the opposite end angled end-face of positioning mandril slide into fly cutter circle staight shank
Scabble and close face contact is formed in plane, the inclination angle of the opposite end angled end-face of the positioning mandril is oblique equal to fly cutter circle staight shank
Scabble plane acute angle theta.
Because acute angle theta value is smaller, stretching screw reinforcement effect is better, and self-locking property is more guaranteed；Ramp structure
Another key property is to clamp the distance that stroke (being moved axially in knife bar centre bore) and fly cutter axially accordingly move along it,
The acute angle theta reduces, then susceptibility increase of the fly cutter along its axial displacement, is refaced after being advantageously implemented fly cutter abrasion, but to axle
Adjustment to positioning precision is unfavorable, therefore, the numerical value of the acute angle theta should not select it is too small.
Further technical scheme is the present invention：The span of the acute angle theta is between (3 °~6 °), the acute angle
θ is preferably 4.5 °.
Analyzed from positioning, fly cutter is rotated around Pivot Point Center line and movement, after clamping, justifies staight shank by fly cutter and positioning is pushed up
The tapered plane of bar two is brought into close contact, and under fly cutter cutter head positioning plane and positioning plain washer and cutting force collective effect, limits this
The free degree of both direction, especially wedge are clamped and the compound positioning of stretching screw and positioning inclined-plane and force application component composition is hung down
Straight cross clamp, there is self-centering, the high reliable clamping of repetitive positioning accuracy, positioning and self-locking are realized simultaneously, and are improved anti-
Screw thread is slackness, and to overcome fly cutter, two side edges alternately participate in cutting sometimes, and cutter tooth produces larger periodicity along its axial line
Alternate torque.
Due to using positioning plain washer and wedge clamping and positioning, therefore position of the fly cutter along direction of axis line can pass through adjustment
Position plain washer；When not using positioning plain washer, the axial movement distance for changing positioning mandril is adjusted, fly cutter abrasion weight
After axially adjustable, fly cutter transverse tooth thickness stills remain on the indexing cylinder of work worm screw mill.The axially position precision of fly cutter for
Positioning mandril displacement is insensitive, improves fly cutter repeatedly refacing property, and limits the free degree that fly cutter rotates around axial line, again
Contact precision depending on two planes that wedge combines.
It is inevitable due in the centrally disposed hole of positioning and clamping mechanism and being easy to stretching screw to put forth effort using the technical scheme
The length of fly cutter circle staight shank will exceed centre bore, and the contact length of fly cutter circle staight shank increases, and in the presence of stretching screw, phase
To position it is more reliable, stability is more preferable, improve the service life of repetitive positioning accuracy and round tube hole.
Using the technical scheme, because the terminal of clamp system uses wedge (i.e. positioning mandril), contact area is big, and it was both
Clamping and reinforcement and self-locking action are played, plays self-centering action again, is a kind of simple and reliable, the higher clamping of positioning precision is determined
The compound clamp system of two simple mechanisms of bit architecture, especially wedge and helical clamping composition, substantially increase clamping can
Lean on and self-locking performance.When force application component exerts a force under the collective effect of positioning plain washer, two tapered planes are brought into close contact, and are realized simultaneously
Fly cutter being accurately positioned on knife bar and clamp；It is particularly suitable for cutting force or modulus is larger, worm gear fly cutter of large pitch angle
Firm clamping.
Further technical scheme is the present invention：The outer circumference surface of the positioning mandril sets annulus of the multistage with guide angle
Connected in star, and concave part start-stop is located at both ends and both ends of the surface cure process.
Further technical scheme is the present invention：Fly cutter circle staight shank is splayed average face and the angle δ of fly cutter rake face
When the fly cutter is clamped on knife bar, determined according to worm screw type, accuracy class, lead angle size and rotation direction, make rake face just
It is in the normal direction of work worm screw or axial plane well；When rake face is just in the Normal plane of work worm screw, fly cutter circle
The splay angle δ of average face and fly cutter rake face of staight shank is equal to work worm indexing cylinder lead angle γ, when rake face is just located
In the axial plane for the worm screw that works, the splay angle δ of average face and fly cutter rake face of fly cutter circle staight shank is 0 °.
The beneficial effects of the invention are as follows：Using the technical scheme of this worm gear fly cutter clamping mode, for the mechanics of materials,
Minimum, simple and compact for structure, making and easy to use, fly cutter positioning precision height and positioning accurate are weakened to the strength and stiffness of knife bar
Really, dual vertical clamping, clamping force are reliable greatly；The coupling stiffness and reliability of fly cutter and knife bar greatly improved, reduce and quiver
Shake, stable cutter load, improve machining condition, improve productivity ratio and fly cutter durability and flank of tooth quality；Due to clamping zero
Part is arranged in knife bar centre bore and not taken up space, while improves security.
Brief description of the drawings
Fig. 1 in the prior art, the clamping schematic diagram of the fly cutter knife bar of involute gear
Fig. 2 is that (r is the circle drawing with screw rod to clamping schematic diagram of the prior art large modulus fly cutter knife bar pull bar provided with arc surface
The radius of the concave arc groove of bar column part)
Fig. 3 be prior art large modulus fly cutter knife bar pull bar set it is bevelled clamping schematic diagram (β is the circle pull bar with screw rod
Column part is splayed the acute angle of plane)
Fig. 4 be the embodiment of the present invention 1 structural representation (R is work worm indexing radius of circle, δ be fly cutter circle staight shank it is oblique
Scabble the angle of plane and fly cutter rake face, θ be fly cutter justify staight shank splay average face and fly cutter justify staight shank axial line angle and
The inclination angle of positioning mandril angled end-face, Sr are force terminal Probe-radius) feature：Dextrorotation, fly cutter are placed in normal direction, and force application component is adopted
Have an area of styletable screw with band, and position and be connected, δ=γ with knife bar centre bore.
Fig. 5 is the structural representation of the embodiment of the present invention 2.Feature：Left-handed, fly cutter is placed in normal direction, force application component using liquid,
Pneumatic cylinder or electric pushrod, and be connected with knife bar centre bore slip positioning and knife bar Partner end face, δ=γ.
Fig. 6 is the structural representation of the embodiment of the present invention 3.Feature：Left or right rotation, fly cutter are placed in axial direction, and force application component is adopted
With spring assembly, and slide positioning with knife bar centre bore and knife bar Partner end face is connected, δ=0 °.
Fig. 7 is the structural representation of the embodiment of the present invention 4.Feature：Dextrorotation, fly cutter are placed in normal direction, and force application component uses band
Have an area of styletable screw, and position and be connected with knife bar centre bore, no positioning plain washer, δ=γ.
Fig. 8 is Fig. 7 of the present invention K to schematic diagram.
Embodiment
Embodiment 1
A kind of clamping mode of the worm gear fly cutter as shown in Figure 4 of embodiment 1, knife bar 1 is by the drive end with taper shank (in figure
Be not shown) and the composition such as elongated Partner, Partner be provided with towards drive end and with the center line concentric center hole of knife bar 1
4, it is radially arranged installation in a certain appropriate position in the middle part of knife bar 1 and tenses the round tube hole 2 of fly cutter circle staight shank 72, the round tube hole
2 are provided at both ends with counterbore 21, wherein the counterbore 21 close to fly cutter circle staight shank 72 one end is provided with stretching screw 10, the fly cutter is justified
The axial line of staight shank 72 is provided with the screw of connection stretching screw 10, the excessively central axis of the round tube hole 2 and the center of knife bar 1
Line, and penetrated with centre bore 4.With the self-assembling formation of counterbore 21
Further technical scheme is：To ensure to have preferably between the supporting surface of stretching screw 10 and counterbore baseplane 22
Contact condition and anti-loosening property；For ensure fly cutter 7 do not move in the knife bar round tube hole 2 and can axially adjustable size, with adjustment
Radial position of the fly cutter 7 on knife bar 1, because of the radial clearance being necessary when worm and wheel engages, so the height of teeth top of fly cutter
There is certain increase than work worm screw, for ease of positioning measurement and resetting, make the installation site of fly cutter 7 accurate, after sharpening
Remain to be continuing with；Plain washer 9, another counterbore baseplane are provided between the counterbore baseplane 22 and the stretching screw 10
Positioning plain washer 3 is provided between 22 and worm gear fly cutter cutter head positioning plane 71, the counterbore baseplane 22 leads to the circle
The central axis of hole 2, accurately to adjust, fly cutter transverse tooth thickness is just on the indexing cylinder of work worm screw and prevention is after by cutting force
Towards the movement at the center of knife bar 1.The stretching screw 10 can be hexagon-headed bolt or hexagon socket cap head screw.
Using the technical scheme, the plain washer 9 is placed in the supporting surface of the stretching screw 10 and the counterbore baseplane
Between 22, play increase and be connected feature contacts surface area, reduce compressive load per unit area and protection is connected piece surface not
Impaired effect.After fly cutter being installed or the abrasion of its cutting tip is refaced, the side of the thickness of plain washer 3 can be positioned by changing
Method, such as another plus shim liner or the positioning plain washer for re-replacing thickness, are just in work worm screw accurately to adjust fly cutter transverse tooth thickness
Index on cylinder and prevent after by cutting force towards the movement at the center of knife bar 1.
The positioning and clamping mechanism 8 is arranged in concentric center hole 4, is the He of force application component 6 successively from Partner end face 11
Positioning mandril 5 and fly cutter 7 form.The force application component 6 can be to exert a force manually and machinery force, and exerting a force manually need to be by various
Force-increasing mechanism carrys out work, and because of limited personnel and unstable, when taking motor-driven clamping, original clamping force can be clamped with continuous action
Reliably, mechanism may not necessarily self-locking.
Due to power caused by the stretching screw 10 and the positioning and clamping mechanism 8, the fly cutter is justified staight shank 72
Force from the stress point of fly cutter 7 farther out, the positioning plain washer 3 is provided between positioning plane 71 because of the fly cutter cutter head,
Improve the reliability of connection.
Further technical scheme is：The force application component 6 is produced axially using band circumference styletable screw when tightening screw
Power.The threaded portion 62 that now the force terminal 61 (i.e. cylindrical end) and force application component 6 produce power is integral.
Those skilled in the art know, fly cutter is when axial force clamps in centre bore 4, when force terminal 61 and positioning mandril 5
Equivalent friction radius of facing when being zero (force terminal 61 is bulb), caused by screw axially (clampings) power and active force and the arm of force into
Direct ratio, it is inversely proportional with screw diameter, generally dozens or even hundreds of times of active force, larger clamping force is produced, so playing
Very big reinforcement effect.Simultaneously fly cutter circle staight shank splay average face 73 angle theta it is smaller, influence to clamping force is negligible not
Meter.
The concentric center hole 4 is in two sections of stair-stepping holes, i.e., is screw 42 close to the portion of being relatively large in diameter of Partner end face 11,
Remaining is that the smaller longer portion of diameter is circle unthreaded hole 41, and the round unthreaded hole 41, which is provided with, to be slided relative to the inner hole wall of circle unthreaded hole 41
The dynamic positioning mandril 5 coordinated.
Further technical scheme is：In the threaded portion 62 and knife bar of the band circumference styletable screw of the force application component 6
The screw 42 in heart hole 4 is positioned and connected.
Further technical scheme is：The band circumference styletable screw 6 and stretching screw 10 are chosen as coarse thread or closely-pitched spiral shell
Line, to improve the self-locking performance and clamping force of screw thread, preferably fine thread.
Further technical scheme is：Checked for convenience of processing or finishing knife bar 1, the arrival end of knife bar centre bore 4 are set
It is equipped with concentric centre hole 43, the taper hole that the centre hole 43 with one heart is 60 °.
Further technical scheme is：The end face of force terminal (i.e. cylindrical end) 61 of the band circumference styletable screw 6 is set
There is the large radius Spherical Surface S r of hardening, make it have automatic aligning ability, with compatible or payment screw 42 and positioning mandril 5 manufacture
And alignment error, improve its installation accuracy and service life and the reliability of clamping；And force terminal 61 and positioning mandril 5 are worked as
It is zero to measure friction radius, improves force increasing ratio and efficiency.
When the opening direction of the acute angle theta is towards fly cutter 74 direction of cutter head, along in the presence of the axial clamping force of knife bar 1,
Fly cutter is set to produce the power backwards to the center of knife bar 1, in the presence of stretching screw 10 and cutting force towards the center of knife bar 1, fly cutter 7
Also it will not move and rotate.
When tightening band circumference styletable screw 6, the cylindrical end 61 with circumference styletable screw moves axially together, and axial force makes
The opposite end angled end-face 51 of positioning mandril, which slides into fly cutter circle staight shank, to be splayed close face contact is formed on average face 73, and is being drawn
Tight screw 10 is fastened on fly cutter 7 in the round tube hole 2 of knife bar under acting on.
Further technical scheme is：For make the opposite end angled end-face 51 of positioning mandril slide into fly cutter justify staight shank splay it is flat
The contact of close face is formed in plane 73, to ensure reliable clamping and fly cutter accurate positioning, the opposite end of the positioning mandril 5 is oblique
The inclination angle of end face 51 is equal to fly cutter circle staight shank and splayed average face acute angle theta.
On the one hand the acute angle theta value is smaller, and the reinforcement effect of stretching screw 10 is better, and self-locking property is more guaranteed；It is another
Another key property of aspect ramp structure is to clamp stroke (being moved axially in knife bar centre bore) and fly cutter along its axial direction
The distance accordingly moved, the acute angle theta reduce, then susceptibility increase of the fly cutter along its axial displacement, is advantageously implemented fly cutter mill
Refaced after damage, but the adjustment to axially position precision is unfavorable, therefore, the numerical value of the acute angle theta should not select it is too small.
Further technical scheme is：The span of the acute angle theta is between (3 °~6 °).
Further technical scheme is again：After being refaced for ease of fly cutter adjustment and axially position precision, can obtain again compared with
Big pulling force and reliability, the acute angle theta are preferably 4.5 °.
Those skilled in the art know that fly cutter 7 is to tense two by wedge and screw along stress during its axial grip
Be grouped into, when fly cutter circle staight shank splay the acute angle theta of average face 73 and fly cutter the circle axial line of staight shank 72 be 4.5 ° when, its wedge clamps
Power is about 3.5 times of active force, and the calculating of screw pulling force is considered as, therefore stretching screw 10 caused by pulling force similar to nut thrust
About 75 times of active force, it is about 265.5 times of active force by the clamping force that above-mentioned power merges, it is clear that act on fly cutter 7
Power increases about 265.5 times, and caused clamping force is very big, so wedge clamping structure and screw tightening structure cleverly group
Close, play very big reinforcement effect.
Along the axial tension of round tube hole 2 and along in the presence of the axial clamping force of knife bar 1, the acute angle theta is smaller, has well
Self-locking and clamping reliability, fly cutter 7 will not be moved and rotated, and can meet the requirement at big cutting force and large pitch angle.
Further technical scheme is：For convenience of flexibly free in circle unthreaded hole 41 of the elongated positioning mandril 5 along centre bore
Slide and rotate, to reduce the circumference of the contact area of positioning mandril 5 and circle unthreaded hole 41, the positioning mandril 5 or circle unthreaded hole 41
Toroidal cavity of the multistage with guide angle is can be set in face, and to be advantageous to process, preferably the outer circumference surface of positioning mandril 5 is set more
Toroidal cavity 52 of the section with guide angle, and concave part start-stop is located at both ends, so fills, tear positioning mandril 5 open and its have it is slight curved
During the long-term crimp in bent or both ends, also it is easy to by the position.Can to improve the service life of positioning mandril 5 and clamping
Lean on, the both ends of the surface cure process of positioning mandril 5.
Because fly cutter rake face 75 typically overlaps with the fly cutter circle axial line of staight shank 72, and there is forward and backward angle for adapting to cut etc.,
When fly cutter 7 is clamped on knife bar 1, fly cutter rake face 75 is just in the Normal plane of work worm screw.And make fly cutter cutter head
Cutting tip with work worm screw identical position.
Further technical scheme is：The fly cutter circle staight shank of the present invention is splayed the angle of average face 73 and fly cutter rake face 75
δ is unrelated with the inclination angle of positioning mandril 5, and so as to reduce rigging error, and prior art is with justifying the setting of pull bar column part
The inclination angle on inclined-plane is relevant.Fly cutter circle staight shank splays average face 73 and the angle δ of fly cutter rake face 75 should make the clamping of fly cutter 7
When on knife bar 1, determined according to worm screw type, accuracy class, lead angle at reference cylinde size and rotation direction, make fly cutter rake face 75
Exactly in the Normal plane of work worm screw.
As Archimedes larger rolling cut worm indexing cylinder lead angle γ or normal direction directly wide dextrorotation worm gear when, the fly cutter
The splay angle δ of average face 73 and fly cutter rake face 75 of circle staight shank is equal to work worm indexing cylinder lead angle γ, the preceding knife
Face 75 is just in the Normal plane of work worm screw, because fly cutter rake face 75 presses normal direction clamping, so can make two side edges all
With 0 ° of anterior angle and suitable relief angle, machining condition can be improved and improve quality and work efficiency.
The present invention is not directed to the other positions of knife bar, routinely sets；The present invention fly cutter circle staight shank splay average face 73 with
The angle δ of fly cutter rake face 75 and with the inclination angle of the angle of its fly cutter circle axial line of staight shank 72 and positioning mandril 5 without outside the Pass, with
And fly cutter circle staight shank 72 axial line is provided with outside the screw of attachment screw 10, the other settings of fly cutter are routinely.
The clamping working procedure of the fly cutter is as follows：
1) plane 71 and counterbore baseplane are positioned to fly cutter cutter head at transverse tooth thickness on work worm indexing cylinder according to fly cutter
22 distance, the positioning plain washer 3 of suitable depth is selected to be fitted into fly cutter circle staight shank 72, fly cutter circle staight shank 72 inserts round tube hole 2
In；
2) fly cutter circle staight shank splays average face 73 towards centre bore 4, is ensureing that fly cutter cutter head positioning plane 71 and positioning are flat
Between packing ring 3 and counterbore baseplane 22 it is seamless under conditions of, clamp system 8 suitably exerts a force；
3) stretching screw 10 is suitably tightened, and when fly cutter transverse tooth thickness is just on the indexing cylinder of work worm screw, is then pressed from both sides
Tight mechanism 8 clamps, and further tightens stretching screw 10；
4) when fly cutter rolling cut for a period of time after abrasion reface regeneration after, repeat the above-mentioned course of work.
The above-mentioned course of work, determine respectively fly cutter 7 on work worm indexing cylinder transverse tooth thickness in radially correct of knife bar 1
Position and the orientation for determining fly cutter rake face 75.
Embodiment 2
Fig. 5 has reacted the concrete structure of another embodiment of the present invention, and it is main that present embodiment is different from the part of embodiment 1
If force application component 6 is liquid, pneumatic cylinder or electric pushrod and positioned with knife bar 1, connected mode；Specifically, the concentric center
The portion of being relatively large in diameter of hole 4 is circle unthreaded hole 42, positions, is provided with the Partner end face 11 some in order to which force application component 6 slides
The individual screw being connected with force application component 6, and the worm gear of institute's rolling cut is left-handed.
Further technical scheme is：The force application component 6 is using liquid, pneumatic cylinder or electric pushrod, by liquid, air pressure or electricity
Produce axial force.By the use of the piston rod of hydraulic cylinder or pneumatic cylinder as force terminal 61, or it is used as and is exerted a force by the use of the push rod of electric pushrod
Terminal 61.
When liquid, pneumatic cylinder or electric pushrod work, force terminal 61 moves axially, and axial force makes the relative of positioning mandril
End angled end-face 51, which slides into fly cutter circle staight shank, to be splayed close face contact is formed on average face 73, and fly cutter 7 is fastened on knife bar
In round tube hole 2.
Further technical scheme is：The force application component 6 slides positioning and knife bar Partner end face with knife bar centre bore 4
11 connections.
Embodiment 3
Fig. 6 has reacted the concrete structure of another embodiment of the invention, and present embodiment, which is different from the part of embodiment 2, is
Force application component 6, it is specifically that the force application component 6 use spring assembly, shown in knife bar centre bore 4 in figure is disk spring
And adjusting washer.
Further technical scheme is：The force application mechanism part 6 uses spring assembly, even resilient after spring stress compression
Deformation, elastic force produce axial force, promote force terminal 61 to move axially, force application component 6 adjusting washer or screw regulation bullet
Power.
Even resilient deforms after the spring stress compression of spring assembly, and force terminal 61 moves axially, and axial force makes fixed
The opposite end angled end-face 51 of position push rod, which slides into fly cutter circle staight shank, to be splayed close face contact is formed on average face 73, fly cutter 7
It is fastened in the round tube hole 2 of knife bar.
The adjusting washer may be alternatively provided between force application component 6 and knife bar Partner end face 11 and (not illustrate separately).For just
Compression stress is produced to spring in screwing screw, the screw is located on the center line of force application mechanism part 6 and knife bar Partner end face 11
Place (does not illustrate separately).
Because fly cutter rake face 75 typically overlaps with the fly cutter circle axial line of staight shank 72, and there is forward and backward angle for adapting to cut etc.,
When fly cutter 7 is clamped on knife bar 1, fly cutter rake face 75 is just in the axial plane of work worm screw, i.e., with knife bar 1
Heart line overlaps.
Further technical scheme is：The fly cutter circle staight shank of the present invention is splayed the angle of average face 73 and fly cutter rake face 75
δ is unrelated with the inclination angle of positioning mandril 5, and so as to reduce rigging error, and prior art is with justifying the setting of pull bar column part
The inclination angle on inclined-plane is relevant.Fly cutter circle staight shank splays average face 73 and the angle δ of fly cutter rake face 75 should make the clamping of fly cutter 7
When on knife bar 1, determined according to worm screw type, accuracy class, lead angle at reference cylinde size and rotation direction, make fly cutter rake face 75
Exactly in the axial plane of work worm screw.
Such as the less Archimedes of rolling cut worm indexing cylinder lead angle γ and the not high normal direction of required precision directly wide worm gear
When, fly cutter circle staight shank splays average face 73 and the angle δ of fly cutter rake face 75 is equal to 0 °, and the rake face 75 is just in
Work in the axial plane of worm screw, because fly cutter rake face 75 presses axial clamping, the cutting angle of such both sides cutting edge is different, such as
Sharp edge is positive rake angle, and root face is negative rake etc., so machining condition is inconsistent, the flank of tooth for being processed worm gear is produced vibration wave
Line, limits the raising of productivity ratio, and the performance of lathe and cutter is not in full use.
Embodiment 4
Fig. 7 has reacted the concrete structure of another embodiment of the invention, is the special case of embodiment 1, present embodiment is not
It is to be not provided with positioning plain washer 3, i.e. counterbore baseplane 22 and worm gear fly cutter cutter head positioning plane 71 to be same as the part of embodiment 1
Between without positioning plain washer 3, determine that fly cutter 7 exists by position of the opposite end angled end-face 51 of positioning mandril in centre bore 4
Radial position on knife bar 1, and remaining is identical.Now, loading the counterbore 21 of positioning plain washer 3 one end can also be not provided with.
Specifically, when between counterbore baseplane 22 and worm gear fly cutter cutter head positioning plane 71 without positioning plain washer 3,
Fly cutter now can not be adjusted by changing the method for the positioning thickness of plain washer 3；Because fly cutter 7 axially positioning precision for
The displacement of positioning mandril 5 is insensitive, and easy to adjust with square-cylindrical end screw axial, changes the opposite end splay end of positioning mandril
Axial location of the face 51 in knife bar centre bore 4, to determine radial position of the fly cutter 7 on knife bar 1, that is, only rely on positioning mandril
The position of opposite end angled end-face 51 determine the fly cutter rake face 75 just on a corresponding position.
For ensure fly cutter 7 do not move in the knife bar round tube hole 2 and can axially adjustable size, to adjust fly cutter 7 in knife bar 1
On radial position, because of the radial clearance being necessary when worm and wheel engages, so the height of teeth top of fly cutter has than work worm screw
Certain increase；For ease of accurate adjustment and measurement and resetting, the installation site of fly cutter 7 is accurate, makes fly cutter rake face 75
Exactly on the corresponding position of work worm screw, the centripetal straight line of 12 deciles is imprinted in knife bar Partner end face 11 and with circumference styletable
Centripetal one, straight line is imprinted on the head of screw 6, i.e. pitch divided by 12 is shown in have an area of the distance of the movement of styletable screw 6 per scale band
Shown in Fig. 8.
Using the technical scheme, fly cutter 7 is installed or its cutting tip is worn after refacing, by adjusting force application component 6, to change
Become axial location of the opposite end angled end-face 51 of positioning mandril in knife bar centre bore 4, radial direction of the adjustment fly cutter 7 on knife bar 1
Position, with accurately adjust fly cutter transverse tooth thickness be just on the indexing cylinder of work worm screw and prevent after by cutting force towards knife bar 1
The movement at center.
The clamping working procedure of the fly cutter is as follows：
1) fly cutter circle staight shank 72 is inserted in round tube hole 2, and knife bar 1 is arrived at transverse tooth thickness on work worm indexing cylinder according to fly cutter
The distance of benchmark such as counterbore baseplane 22, determines the position of fly cutter in knife bar 1 radially；
2) fly cutter circle staight shank average face 73 of splaying suitably clamps towards centre bore 4, positioning and clamping mechanism 8；
3) stretching screw 10 is suitably tightened, and when fly cutter transverse tooth thickness is just on the indexing cylinder of work worm screw, is then pressed from both sides
Tight mechanism 8 clamps again, further tightens stretching screw 10；When fly cutter transverse tooth thickness not work worm screw indexing cylinder on when, root
Have an area of styletable screw according to the triangle geometrical relationship rotating band of fly cutter radial dimension deviation and acute angle theta, fly cutter transverse tooth thickness is just in
Work on the indexing cylinder of worm screw.
4) when fly cutter rolling cut for a period of time after abrasion reface regeneration after, repeat the above-mentioned course of work.
The above-mentioned course of work, determine respectively fly cutter 7 on work worm indexing cylinder transverse tooth thickness in radially correct of knife bar 1
Position and the orientation for determining fly cutter rake face 75.
But it will be apparent to a skilled person that force application component 6 be not limited to it is specific shown in Fig. 4 to Fig. 7
Structure type, for example, spring can be cylinder or disk spring, or even rubber spring etc., in addition, concentric center hole 4 and unlimited
In being formed as circular hole chamber, it may be formed as square hole chamber, such as four square holes, certainly, in the case, positioning mandril 5 and force
The shape of component 6 carries out correspondingly modification, and the positioning of force application component 6, connected mode carry out adaptations.
The better embodiment of the present invention is described above in association with accompanying drawing detail, still, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the present invention, a variety of letters can be carried out to technical scheme
Monotropic shape, these simple deformations belong to protection scope of the present invention.If force application component is using the gas-hydraulic pressure for playing respective advantage
Joint force or Electrohydraulic push rod etc., this has no effect on the object of the invention realization.
It is further to note that each technical characteristic described in above-mentioned embodiment, reconcilable
In the case of, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention is to various possible
Combination no longer separately illustrates.
Above-described embodiment is used for illustrative purposes only, and not limitation of the present invention, about the common of technical field
Technical staff, without departing from the spirit and scope of the present invention, can be so that various changes can be made and modification, therefore owns
Equivalent technical scheme should also belong to scope of the invention, and scope of patent protection of the invention should be limited by each claim.
Claims (10)
1. a kind of dual clamping mode of worm gear fly cutter, it is characterised in that the knife bar (1) is by the drive end with taper shank and elongated
Partner composition, the Partner of the knife bar (1) is provided with drive end and the centre bore concentric with knife bar (1) center line
(4) installation, is radially provided with the middle part of knife bar (1) and tenses the round tube hole (2) of fly cutter (7), the both ends of the round tube hole (2) are provided with
Counterbore (21), wherein the counterbore close to fly cutter circle staight shank (72) one end is provided with stretching screw (10), the fly cutter circle staight shank (72)
Axial line is provided with the screw of connection stretching screw (10), the excessively central axis of the round tube hole (2) and knife bar (1) center
Line, and penetrated with round tube hole (2), in positioning and clamping mechanism (8) centrally disposed hole (4), it is successively from Partner end face (11)
Force application component (6) and positioning mandril (5) and fly cutter (7) composition, fly cutter circle staight shank are splayed the sharp of average face (73) and its axial line
Angle θ opening direction towards fly cutter cutter head (74), in power collective effect caused by stretching screw (10) and force application component (6)
Under, the opposite end angled end-face (51) of positioning mandril is slid on the average face (73) of splaying of fly cutter circle staight shank and form close face
Contact, fly cutter (7) is fastened in the round tube hole (2) of knife bar, and make the cutting tip of fly cutter cutter head (74) with work worm screw
Identical position.
A kind of 2. dual clamping mode of worm gear fly cutter according to claim 1, it is characterised in that the counterbore baseplane
(22) plain washer (9), another counterbore baseplane (22) and the worm gear fly cutter knife are provided between the stretching screw (10)
Set between head positioning plane (71) with or without positioning plain washer (3), the counterbore baseplane (22) and the round tube hole (2) center
Line is vertical.
A kind of 3. dual clamping mode of worm gear fly cutter according to claim 1, it is characterised in that the force application component (6)
Styletable screw is had an area of using band, axial force is produced when tightening screw.
A kind of 4. dual clamping mode of worm gear fly cutter according to claim 1, it is characterised in that the force application component (6)
Using liquid, pneumatic cylinder or electric pushrod, axial force is produced by liquid, air pressure or electricity, by the use of the piston rod of hydraulic cylinder or pneumatic cylinder as
The terminal that exerts a force (61), or it is used as the terminal (61) that exerts a force with the push rod of electric pushrod.
A kind of 5. dual clamping mode of worm gear fly cutter according to claim 1, it is characterised in that the force application component (6)
Using spring assembly, even resilient deforms after spring stress compression, and elastic force produces axial force, and force application component (6) uses adjusting pad
Circle or screw regulation elastic force.
A kind of 6. dual clamping mode of worm gear fly cutter according to claim 1, it is characterised in that the force application component (6)
Position and be connected with knife bar centre bore (4), or be connected with knife bar centre bore (4) slip positioning and knife bar Partner end face (11).
7. the dual clamping mode of a kind of worm gear fly cutter according to claim 1, it is characterised in that the positioning mandril
The inclination angle of opposite end angled end-face (51) is equal to fly cutter circle staight shank and splayed the acute angle thetas of average face (73).
A kind of 8. dual clamping mode of worm gear fly cutter according to claim 7, it is characterised in that the value of the acute angle theta
For scope between (3 °~6 °), the acute angle theta is 4.5 °.
A kind of 9. dual clamping mode of worm gear fly cutter according to claim 1, it is characterised in that the positioning mandril (5)
Outer circumference surface toroidal cavity (52) of the multistage with guide angle is set, concave part start-stop is located at both ends and both ends of the surface hardening
Reason.
10. the dual clamping mode of a kind of worm gear fly cutter according to claim 1, it is characterised in that the fly cutter justifies staight shank
The angle δ for scabbling plane (73) and fly cutter rake face (75) is equal to work worm indexing cylinder lead angle γ, or for 0 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610649698.9A CN107717138A (en) | 2016-08-10 | 2016-08-10 | A kind of dual clamping mode of worm gear fly cutter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610649698.9A CN107717138A (en) | 2016-08-10 | 2016-08-10 | A kind of dual clamping mode of worm gear fly cutter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107717138A true CN107717138A (en) | 2018-02-23 |
Family
ID=61200013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610649698.9A Pending CN107717138A (en) | 2016-08-10 | 2016-08-10 | A kind of dual clamping mode of worm gear fly cutter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107717138A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111331203A (en) * | 2018-12-19 | 2020-06-26 | 杭州凯和精工机械有限公司 | Single-tool-tip worm gear machining method |
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| DE879949C (en) * | 1951-01-23 | 1953-06-18 | Edler & Sohn | Impact tooth or impact knife for the production of teeth on gear bodies, in particular on worm gear bodies, as well as processes for the production of this tool |
| EP0088807A1 (en) * | 1982-03-06 | 1983-09-21 | IMS Morat Söhne GmbH | Gear making tool for milling gears and other workpieces |
| CN88211399U (en) * | 1988-01-30 | 1988-12-28 | 邹和明 | Cutting device expanded in toothed shape |
| CN2041221U (en) * | 1988-07-30 | 1989-07-19 | 薛国庆 | Changeable arbor of fly cutter |
| CN201470911U (en) * | 2009-08-20 | 2010-05-19 | 宁波欧乐机械有限公司 | High-precision micro-adjustment tool mechanism |
| CN202239977U (en) * | 2011-09-05 | 2012-05-30 | 浙江台玖精密机械有限公司 | Fly cutter special for worm gear hobbing |
| CN203245381U (en) * | 2013-04-19 | 2013-10-23 | 宁波江北永瑞机械有限公司 | High precision fine-tuning boring tool |
| CN206122828U (en) * | 2016-08-10 | 2017-04-26 | 中钢集团衡阳重机有限公司 | Tight structure of dual clamp of worm wheel flying knife |
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2016
- 2016-08-10 CN CN201610649698.9A patent/CN107717138A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE510900C (en) * | 1929-02-19 | 1930-10-24 | Hermann Pottgiesser | Milling arbor with inserted interchangeable fly knives for milling worm wheels |
| DE879949C (en) * | 1951-01-23 | 1953-06-18 | Edler & Sohn | Impact tooth or impact knife for the production of teeth on gear bodies, in particular on worm gear bodies, as well as processes for the production of this tool |
| EP0088807A1 (en) * | 1982-03-06 | 1983-09-21 | IMS Morat Söhne GmbH | Gear making tool for milling gears and other workpieces |
| CN88211399U (en) * | 1988-01-30 | 1988-12-28 | 邹和明 | Cutting device expanded in toothed shape |
| CN2041221U (en) * | 1988-07-30 | 1989-07-19 | 薛国庆 | Changeable arbor of fly cutter |
| CN201470911U (en) * | 2009-08-20 | 2010-05-19 | 宁波欧乐机械有限公司 | High-precision micro-adjustment tool mechanism |
| CN202239977U (en) * | 2011-09-05 | 2012-05-30 | 浙江台玖精密机械有限公司 | Fly cutter special for worm gear hobbing |
| CN203245381U (en) * | 2013-04-19 | 2013-10-23 | 宁波江北永瑞机械有限公司 | High precision fine-tuning boring tool |
| CN206122828U (en) * | 2016-08-10 | 2017-04-26 | 中钢集团衡阳重机有限公司 | Tight structure of dual clamp of worm wheel flying knife |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111331203A (en) * | 2018-12-19 | 2020-06-26 | 杭州凯和精工机械有限公司 | Single-tool-tip worm gear machining method |
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Application publication date: 20180223 |