CN206122828U - Tight structure of dual clamp of worm wheel flying knife - Google Patents

Abstract

The utility model relates to a tight structure of dual clamp of worm wheel flying knife, the passive end of cutter arbor be equipped with orientation initiative end and with the endocentric centre bore of cutter arbor central line, radially be equipped with the flexible hole of installation and taut flying knife at the cutter arbor middle part, the both ends in flexible hole are equipped with the counter bore, and the counter bore that wherein is close to flying knife circle straight shank one end is equipped with tension screw, be equipped with the screw of connecting tension screw on the flying knife circle straight shank axial lead, the perpendicular cutter arbor central line of just crossing of central line in flexible hole to have a perfect understanding with the centre bore, the location clamping mechanism set up in the centre bore, tension screw and location clamping mechanism effect down, locating ejector rod's looks remote site beveled tip face slides and forms inseparable face contact to the average face of flying knife circle straight shank chamfered on, the flying knife fastening flexible downthehole, and the cutting tip that makes the flying knife be in with the same position of worm of working. Adopt that axial positioning presss from both sides technical scheme tight and the taut flying knife of flexible downthehole axial in this kind of centre bore, be fit for cutting force or the modulus is great, rolling of the worm wheel of big lead angle is cut.

Description

A kind of dual clamping structure of worm gear fly cutter

Technical field

The present invention relates to a kind of dual clamping structure 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 long the production cycle is using uneconomical, and the manufacture of bull worm gear hob is more difficult, Worm gear hob is manufactured in Single unit job lot production very uneconomical, 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 pluses and minuses of fly cutter are manufactures Simply, low cost, low production efficiency, but accurately use also correct if fly cutter makes, then the worm gear precision for processing is simultaneously The precision of worm gear hob processing is not less than, so this is also conventional fly cutter carrys out one of main cause of machining worm wheel.Fly cutter loads knife bar After answer clamping reliability, it is impossible to cutting when occur slide and rotate.Knife bar is radially arranged installs the circular hole that fly cutter justifies staight shank, should The central axis in hole and excessively knife bar center line；Be illustrated in figure 1 processing in, the clamping structure of involute gear fly cutter.Fly cutter Circle staight shank is mounted in the circular hole of knife bar 1, and tightening nut 3 and 4 makes round buss 2 move 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 diminishes impact intensity；This lever structure is simple, easy to adjust, but clamping less reliable, Concave arc groove requires higher.Clamping structure of the fly cutter of processing large modulus worm gear on knife bar has two kinds, as shown in Figures 2 and 3, twists Tight nut makes the round pull bar with screw rod move axially in round tube hole, concave arc groove or plane of splaying point that its column part is arranged To lock, fly cutter does not justify staight shank or fly cutter justifies the face of scabbling of staight shank.This clamping structure clamping force is big, and fly cutter is difficult to loosen, but Both clamping structures are radially arranged the perpendicular intersection of the circular hole of installation circle pull bar and fly cutter along knife bar to be run through, and weakens knife bar strong Degree and rigidity, this vertical interlaced hole, manufacture is difficult, and the concave arc groove shown in Fig. 2 and pitch-row require higher, suitable knife bar The occasion being relatively large in diameter.Because the quantity of fly cutter on knife bar is seldom easily worn and torn, and cutting tip is again that concentrated wear comparatively fast increases Cutting resistance is added；Again because fly cutter rolling cut worm gear is tangential admission, when fly cutter from incision end rolling cut to cut out end when, fly cutter is cut Cut sword and be cut to both sides cutting again to opposite side cutting from side, cutter tooth is along the larger periodic alternation torsion of its axial line generation Square, fly cutter circle staight shank is have certain gap with the circular hole of knife bar, and by between knife bar and supported end rigidity and bearing rotary member The impact 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 structure is all difficult to It is competent at.

The content of the invention

It is an object of the invention to provide one kind axial locating clip in the knife bar centre bore is tight and round tube hole in axial tightening snail The positioning clamping of wheel fly cutter, is suitable for cutting force or modulus is larger, large pitch angle worm gear fly cutter firm clamping.

The technical scheme is that：Including knife bar, the knife bar is by the drive end with taper shank and elongated Partner group Into the Partner is provided with drive end and the centre bore concentric with knife bar center line, and installation is radially provided with the middle part of knife bar With the round tube hole for tensing fly cutter, the two ends of the round tube hole are provided with counterbore, wherein the counterbore for justifying staight shank one end near fly cutter 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 cross knife bar center line, and with centre bore insertion, in the centrally disposed hole of positioning and clamping mechanism, be sequentially provided with from Partner end face Force application component and positioning mandril and fly cutter, fly cutter circle staight shank splay average face and its axial line acute angle theta opening direction direction The cutter head of fly cutter, under the power collective effect that stretching screw and force application component are produced, the opposite end angled end-face of positioning mandril slides Splaying close face contact of formed on average face to fly cutter circle staight shank, fly cutter is fastened in the round tube hole of knife bar, and make fly cutter The cutting tip of cutter head is in and work worm screw identical position.

Further technical scheme is the present invention：Wherein plain washer is provided between counterbore baseplane and the stretching screw, It is provided with or without positioning plain washer between another counterbore baseplane and worm gear fly cutter cutter head positioning plane.

Using the technical scheme, the plain washer be placed in the stretching screw supporting surface 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 is not damaged Bad effect.After fly cutting part wears are refaced, the method that can pass through to change positioning plain washer thickness, such as another plus shim liner 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, accurately to adjust, fly cutter transverse tooth thickness is just on the indexing cylinder of work worm screw and prevention is received after cutting force towards knife bar center Movement.

Further technical scheme is the present invention：The force application component is produced using band circumference styletable screw 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 using simply may be used The clamp system for leaning on, particularly it have 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 adopts liquid, pneumatic cylinder or electric pushrod, by liquid, gas Pressure or electricity produce axial force, with the piston rod of hydraulic cylinder or pneumatic cylinder as force terminal, or with the push rod conduct of electric pushrod 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 Plus pressure can the corresponding pressure of increase, 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 many, 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 rigidly big, stable working, reliable clamping, the noise that clamp are little.When adopting electric pushrod When, motor drives a pair of feed screw nuts that the rotary motion of motor is changed into linear motion after gear mechanism deceleration, utilizes 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 adopts spring assembly, uniform after spring stress compression Elastic deformation, elastic force produces axial force, and force application component adjusts elastic force with adjustment packing ring or screw.

Using the technical scheme, from Hooke's law, spring when there is elastic deformation, the elastic force F of spring and spring Elongation (or decrement) x be 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 change reinforcement using its length.

Further technical scheme is the present invention：The force application component is positioned and is connected with knife bar centre bore, or described is applied Power component slides with knife bar centre bore and positions and be connected with 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 provided with concentric centre hole for 60 ° of taper holes.

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 that opposite end angled end-face to make positioning mandril slides into fly cutter circle staight shank Scabble and formed in plane close face contact, 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 the acute angle theta value is less, stretching screw reinforcement effect is better, and self-locking property is more guaranteed；Ramp structure Another key property is to clamp stroke (moving axially i.e. in knife bar centre bore) and fly cutter along its axially accordingly mobile distance, The acute angle theta reduces, then fly cutter increases along the susceptibility of its axial displacement, is advantageously implemented after fly cutter abrasion and refaces, but to axle Adjustment to positioning precision is unfavorable, for this purpose, the numerical value of the acute angle theta should not select too small.

Further technical scheme is the present invention：The span of the acute angle theta is between 3 °～6 °.

Again further technical scheme is the present invention：The acute angle theta is 4.5 °.

Analyze from positioning, fly cutter is rotated and mobile around Pivot Point Center line, after clamping, by fly cutter circle staight shank and positioning top 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 stretching screw hangs down with the compound positioning on positioning inclined-plane and force application component composition Straight cross clamp, with self-centering, the high reliable clamping of repetitive positioning accuracy, positioning and self-locking are realized simultaneously, and are improve anti- Screw thread slackness, to overcome fly cutter, sometimes two side edges alternately participate in cutting, and cutter tooth produces larger periodicity along its axial line Alternate torque.

Due to adopting positioning plain washer and wedge clamping and positioning, therefore fly cutter can be by adjustment along the position of direction of axis line Positioning plain washer；When positioning plain washer is not adopted, the axial movement distance for changing positioning mandril is adjusted, fly cutter abrasion weight To after adjustment, fly cutter transverse tooth thickness is stilled remain on the indexing cylinder of work worm screw mill warp beam.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, and The contact precision of two planes combined depending on wedge.

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 positioning more reliable, stability more preferably, the service life of repetitive positioning accuracy and round tube hole is improve.

Using the technical scheme, because the terminal of clamp system adopts wedge (i.e. positioning mandril), contact area is big, and it was both Clamping and reinforcement and self-locking action are played, self-centering action is played again, be a kind of simple and reliable, the higher clamping of positioning precision is determined The compound clamp system of bit architecture, especially wedge and two simple mechanisms of helical clamping composition, substantially increase clamping can By 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, while realizing Fly cutter being accurately positioned on knife bar and clamp；It is particularly suitable for cutting force or modulus is larger, large pitch angle worm gear fly cutter Firm clamping.

Further technical scheme is the present invention：The outer circumference surface of the positioning mandril arranges annulus of the multistage with guide angle Connected in star, and the toroidal cavity start-stop is located at the positioning mandril two 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 fly cutter should be made to be clamped on knife bar, determined according to worm screw type, accuracy class, lead angle size and rotation direction, make rake face just It is well in the normal direction or axial plane of work worm screw；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 of 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 invention has the beneficial effects as follows：Using the technical scheme of this worm gear fly cutter clamping structure, from for the mechanics of materials, The strength and stiffness of knife bar are weakened it is minimum, it is simple and compact for structure, make and easy to use, fly cutter positioning precision is high and positioning accurate Really, the big reliability of dual vertical clamping, clamping force；The coupling stiffness and reliability of fly cutter and knife bar is greatly improved, is reduced and is quivered Shake, stable cutter load improves machining condition, improves productivity ratio and fly cutter durability and flank of tooth quality；Due to clamping zero Part is arranged in knife bar centre bore and does not take up space, while improve security.

Description of the drawings

Fig. 1 be prior art in, the clamping schematic diagram of the fly cutter knife bar of involute gear

Fig. 2 be prior art large modulus fly cutter knife bar pull bar be provided with arc surface clamping schematic diagram (r be with screw rod circle drawing The radius of the concave arc groove of bar column part)

Fig. 3 sets bevelled clamping schematic diagram for prior art large modulus fly cutter knife bar pull bar, and (β is the round pull bar with screw rod Column part is splayed the acute angle of plane)

Fig. 4 for the embodiment of the present invention 1 structural representation (R be 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, force application component is positioned and be connected with knife bar centre bore, δ=γ.

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, force application component slides with knife bar centre bore and positions and be connected with 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, force application component and knife bar centre bore slide and positioning and are connected with knife bar Partner end face, 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 adopts band Circumference styletable screw, force application component is positioned and is connected with knife bar centre bore, is not provided with positioning plain washer, δ=γ.

Fig. 8 is the K of Fig. 7 of the present invention to schematic diagram.

Specific embodiment

Embodiment 1

A kind of clamping structure of the worm gear fly cutter as shown in Figure 4 of embodiment 1, including knife bar 1, the knife bar 1 is bored by band Drive end (not shown) and elongated Partner of handle etc. are constituted, Partner be provided with towards drive end and with knife bar 1 Center line concentric center hole 4, is radially arranged in a certain appropriate position in the middle part of knife bar 1 and installs and tense the circle that fly cutter justifies staight shank 72 Through hole 2, the two ends of the round tube hole 2 are provided with counterbore 21, wherein the counterbore 21 for justifying the one end of staight shank 72 near fly cutter is provided with tension Screw 10, the fly cutter circle axial line of staight shank 72 is provided with the screw of connection stretching screw 10, and the center line of the round tube hole 2 hangs down It is straight and cross the center line of knife bar 1, and with the insertion of centre bore 4.

Further technical scheme is：To ensure to have between the supporting surface of stretching screw 10 and counterbore baseplane 22 preferably Contact condition and anti-loosening property；Do not move and the axially adjustable size of energy to ensure that fly cutter 7 is mounted in knife bar round tube hole 2, to adjust Radial position of the fly cutter 7 on knife bar 1, the radial clearance being necessary when engaging because of worm and wheel, 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 is provided between wherein described counterbore baseplane 22 and the stretching screw 10, another counterbore bottom Positioning plain washer 3 is provided between plane 22 and worm gear fly cutter cutter head positioning plane 71, the counterbore baseplane 22 is logical with 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 by after 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 its cutting tip abrasion is refaced, the side for changing the positioning thickness of plain washer 3 can be passed through Method, the such as another positioning plain washer for adding shim liner or re-replacing thickness, accurately to adjust fly cutter transverse tooth thickness work worm screw is just in Receive after cutting force towards the movement at the center of knife bar 1 with prevention on indexing cylinder.

Positioning and clamping mechanism 8 is arranged in concentric center hole 4, is sequentially provided with force application component 6 from Partner end face 11 and is determined Position push rod 5 and fly cutter 7.The force application component 6 can be to exert a force manually and machinery force, and exerting a force need to pass through various power increasing machines manually Structure carrys out work, and because of limited personnel and unstable, when taking motor-driven clamping, original clamping force can be with continuous action, reliable clamping, machine Structure may not necessarily self-locking.

Due to the power that the stretching screw 10 and the positioning and clamping mechanism 8 are produced, the fly cutter is justified staight shank 72 Force farther out, because the fly cutter cutter head is positioned the positioning plain washer 3 is provided with from the stress point of the fly cutter 7 between plane 71, 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 force terminal 61 (i.e. cylindrical end) and force application component 6 produce power is one.

Those skilled in the art know, fly cutter is when axial force is clamped in centre bore 4, when force terminal 61 and positioning mandril 5 Equivalent friction radius of facing be zero (force terminal 61 is bulb) when, axial direction (clampings) power that screw is produced and active force and the arm of force into Direct ratio, is inversely proportional to screw diameter, generally dozens or even hundreds of times of active force, larger clamping force is produced, so playing Very big reinforcement effect.While fly cutter circle staight shank is splayed, the angle theta in average face 73 is less, and the impact to clamping force is negligible not Meter.

The concentric center hole 4 is in two sections of stair-stepping holes, i.e., be screw 42 near the portion of being relatively large in diameter of Partner end face 11, Remaining is that the less longer portion of diameter is circle unthreaded hole 41, and the round unthreaded hole 41 is provided with can be slided relative to the inner hole wall of circle unthreaded hole 41 The dynamic positioning mandril 5 for coordinating.

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, is the self-locking performance and clamping force for improving screw thread, preferably fine thread.

Further technical scheme is：Check for convenience of processing or repair knife bar 1, the arrival end of knife bar centre bore 4 sets Concentric centre hole 43 is equipped with, the concentric centre hole 43 is 60 ° of taper hole.

Further technical scheme is：Force terminal (i.e. cylindrical end) 61 end faces with circumference styletable screw 6 are arranged There is large radius Spherical Surface S r of hardening so as to automatic aligning ability, with compatible or payment screw 42 and positioning mandril 5 manufacture And alignment error, improve the reliability of its installation accuracy and service life and clamping；And exert a force terminal 61 and positioning mandril 5 are worked as Amount friction radius are zero, improve force increasing ratio and efficiency.

When the opening direction of the acute angle theta is towards fly cutter 74 direction of cutter head, in the presence of the axial clamping force of knife bar 1, Fly cutter is set to produce the power at the dorsad center of knife bar 1, in stretching screw 10 and towards in the presence of the cutting force at the center of knife bar 1, fly cutter 7 Also will not move and rotate.

When band circumference styletable screw 6 is tightened, the cylindrical end 61 with circumference styletable screw is moved axially together, and axial force makes The opposite end angled end-face 51 of positioning mandril slides into fly cutter circle staight shank and splaying close face contact of formed on average face 73, and is drawing 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：Opposite end angled end-face 51 to make positioning mandril slide into fly cutter circle staight shank splay it is flat Close face contact is formed in plane 73, to guarantee 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 splays average face acute angle theta.

On the one hand the acute angle theta value is less, 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 (moving axially i.e. in knife bar centre bore) and fly cutter along its axial direction Corresponding mobile distance, the acute angle theta reduces, then fly cutter increases along the susceptibility of its axial displacement, is advantageously implemented fly cutter mill Reface after damage, but it is unfavorable to the adjustment of axially position precision, for this purpose, the numerical value of the acute angle theta should not select too small.

Further technical scheme is：The span of the acute angle theta is between 3 °～6 °.

Again further technical scheme is：After refacing for ease of fly cutter adjustment and axially position precision, can obtain again compared with Big pulling force and reliability, the acute angle theta is preferably 4.5 °.

Those skilled in the art know, fly cutter 7 along its axial grip when stress be to tense two by wedge and screw It is grouped into, when fly cutter justifies staight shank to be splayed average face 73 and fly cutter to justify the acute angle theta of the axial line of staight shank 72 be 4.5 °, its wedge is clamped Power is about 3.5 times of active force, and the calculating of screw pulling force is considered as, therefore pulling force that stretching screw 10 produce similar to nut thrust About 75 times of active force, are about 265.5 times of active force, it is clear that act on fly cutter 7 by the clamping force that above-mentioned power merges Power increases about 265.5 times, and the clamping force of generation 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 in the presence of the axial clamping force of knife bar 1, the acute angle theta is less, 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：It is flexibly free along the round unthreaded hole 41 of centre bore for convenience of elongated positioning mandril 5 Slide and rotate, be the circumference of the contact area for reducing positioning mandril 5 and circle unthreaded hole 41, the positioning mandril 5 or circle unthreaded hole 41 Face can arrange toroidal cavity of the multistage with guide angle, and to be conducive to processing, the preferably outer circumference surface of positioning mandril 5 arranges many Toroidal cavity 52 of the section with guide angle, and the start-stop of the toroidal cavity 52 is located at the two ends of the positioning mandril 5, so fills, Tear open positioning mandril 5 and its when having slight bending or the long-term crimp in two ends, be also easy to by the position.To improve positioning top The service life and reliable clamping of bar 5, the both ends of the surface cure process of the 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 cutting 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, so as to reduce rigging error, and prior art and circle pull bar column part are arranged The inclination angle on inclined-plane is relevant.Fly cutter circle staight shank average face 73 of splaying should make the clamping of fly cutter 7 with the angle δ of fly cutter rake face 75 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.

During exterior feature dextrorotation worm gear as straight such as rolling cut worm indexing cylinder lead angle γ larger Archimedes or normal direction, 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 front 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 quality and work efficiency is improved.

The present invention is not directed to other positions of knife bar, routinely arranges；The present invention fly cutter circle staight shank splay average face 73 with The inclination angle of the angle δ of fly cutter rake face 75 and the angle with its fly cutter circle axial line of staight shank 72 and positioning mandril 5 without outside the Pass, with And fly cutter circle the axial line of staight shank 72 be provided with outside the screw of attachment screw 10, the fly cutter other arrange 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 for selecting suitable depth is fitted in fly cutter circle staight shank 72, the fly cutter circle insertion round tube hole 2 of staight shank 72 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 after regeneration, the above-mentioned course of work of repetition.

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 of determination 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 be liquid, pneumatic cylinder or electric pushrod and with knife bar 1 position, connected mode；Specifically, the concentric center The portion of being relatively large in diameter of hole 4 is circle unthreaded hole 42, slides in order to force application component 6 and positions, and is provided with the Partner end face 11 some 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 adopts liquid, pneumatic cylinder or electric pushrod, by liquid, air pressure or electricity Produce axial force.With the piston rod of hydraulic cylinder or pneumatic cylinder as force terminal 61, or with the push rod of electric pushrod as force Terminal 61.

When liquid, pneumatic cylinder or electric pushrod work, force terminal 61 is moved axially, and axial force makes the relative of positioning mandril End angled end-face 51 slides into fly cutter circle staight shank and splaying close face contact of 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 and knife bar centre bore 4 slide positioning and with knife bar Partner end Face 11 connects.

Embodiment 3

Fig. 6 has reacted the concrete structure of another embodiment of the invention, and present embodiment is different from the part of embodiment 2 is Force application component 6, specifically, the force application component 6 adopts spring assembly, and shown in knife bar centre bore 4 in figure is disk spring With adjustment packing ring.

Further technical scheme is：The force application mechanism part 6 adopts spring assembly, even resilient after spring stress compression Deformation, elastic force produces axial force, promotes force terminal 61 to move axially, and force application component 6 adjusts bullet with adjustment packing ring or screw Power.

The even resilient deformation after spring stress of spring assembly compresses, force terminal 61 is moved axially, and axial force makes fixed The opposite end angled end-face 51 of position push rod slides into fly cutter circle staight shank and splaying close face contact of formed on average face 73, fly cutter 7 It is fastened in the round tube hole 2 of knife bar.

The adjustment packing ring may be alternatively provided at and (separately do not illustrated) between force application component 6 and knife bar Partner end face 11.For just Compression stress is produced to spring in screw is screwed, the screw is located on the center line of force application mechanism part 6 and knife bar Partner end face 11 Place (does not separately illustrate).

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 cutting 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 in 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, so as to reduce rigging error, and prior art and circle pull bar column part are arranged The inclination angle on inclined-plane is relevant.Fly cutter circle staight shank average face 73 of splaying should make the clamping of fly cutter 7 with the angle δ of fly cutter rake face 75 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 straight exterior feature worm gear of the not high normal direction of the less Archimedes of rolling cut worm indexing cylinder lead angle γ and required precision When, fly cutter circle staight shank average face 73 of splaying is equal to 0 ° with the angle δ of fly cutter rake face 75, and the rake face 75 is just in In the axial plane of work worm screw, because fly cutter rake face 75 is by 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, easily makes the flank of tooth for being processed worm gear produce vibration wave Line, the performance for limiting the raising of productivity ratio, 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, and present embodiment is not It is to be not provided with positioning plain washer 3, i.e. counterbore baseplane 22 with worm gear fly cutter cutter head positioning plane 71 to be same as the part of embodiment 1 Between be not provided with position plain washer 3, determine fly cutter by position of the opposite end angled end-face 51 of positioning mandril in centre bore 4 7 radial positions on knife bar 1, and remaining is identical.Now, loading the counterbore 21 of positioning plain washer 3 one end also can be not provided with.

Specifically, it is not provided with positioning plain washer between plane 71 when counterbore baseplane 22 and the worm gear fly cutter cutter head are positioned When 3, now fly cutter can not be adjusted by changing the method for the positioning thickness of plain washer 3；Because of the axially positioning precision of fly cutter 7 It is insensitive for the displacement of positioning mandril 5, and band square-cylindrical end screw axial is easy to adjust, changes the opposite end of positioning mandril Axial location of the angled end-face 51 in knife bar centre bore 4 only rely on positioning determining radial position of the fly cutter 7 on knife bar 1 The position of the opposite end angled end-face 51 of push rod is determining fly cutter rake face 75 just on a corresponding position.

Do not move and the axially adjustable size of energy to ensure that fly cutter 7 is mounted in knife bar round tube hole 2, to adjust fly cutter 7 in knife bar 1 On radial position, the radial clearance being necessary when engaging because of worm and wheel, 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, in knife bar Partner end face 11 the centripetal straight line of 12 deciles and band circumference styletable are imprinted The head of screw 6 imprints the distance that centripetal one, straight line, i.e. pitch are the movement of every scale band circumference styletable screw 6 divided by 12, sees Shown in Fig. 8.

Using the technical scheme, fly cutter 7 is installed or its cutting tip weares and teares 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, adjust radial direction of the fly cutter 7 on knife bar 1 Position, accurately to adjust, fly cutter transverse tooth thickness is just on the indexing cylinder of work worm screw and prevention is received after cutting force towards knife bar 1 The movement at center.

The clamping working procedure of the fly cutter is as follows：

1) in fly cutter circle staight shank 72 insertion round tube hole 2, 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 fly cutter position in knife bar 1 radially；

2) fly cutter circle staight shank splays average face 73 towards centre bore 4, and positioning and clamping mechanism 8 is suitably clamped；

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 On the indexing cylinder of work worm screw.

4) when fly cutter rolling cut for a period of time after abrasion reface after regeneration, the above-mentioned course of work of repetition.

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 of determination 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 concrete shown in Fig. 4 to Fig. 7 Version, for example, spring can be cylinder or disk spring, or even rubber spring etc., additionally, concentric center hole 4 does not limit In circular hole chamber is formed as, 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, but, 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, various 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 specific embodiment, reconcilable In the case of, can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention is to various possible Combination is no longer separately illustrated.

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 all The technical scheme of equivalent should also belong to scope of the invention, and the scope of patent protection of the present invention should be limited by each claim.

Claims (11)

1. a kind of dual clamping structure of worm gear fly cutter, including knife bar (1), it is characterised in that the knife bar (1) is by with taper shank Drive end and elongated Partner composition, the Partner of the knife bar (1) is provided with drive end and same with knife bar (1) center line The centre bore (4) of the heart, the round tube hole (2) installed and tense fly cutter (7), the round tube hole (2) are radially provided with knife bar (1) middle part Two ends be provided with counterbore (21), wherein near fly cutter justify staight shank (72) one end counterbore be provided with stretching screw (10), the fly cutter Justify the screw that staight shank (72) axial line is provided with connection stretching screw (10), the excessively central axis of the round tube hole (2) and knife Bar (1) center line, and with centre bore (4) insertion, in the centrally disposed hole (4) of positioning and clamping mechanism (8), from Partner end face (11) force application component (6) and positioning mandril (5) and fly cutter (7) are sequentially provided with, fly cutter circle staight shank is splayed average face (73) and its axle The opening direction of the acute angle theta of heart line is total to towards the cutter head (74) of fly cutter in the power of stretching screw (10) and force application component (6) generation Under same-action, make positioning mandril opposite end angled end-face (51) slide into fly cutter circle staight shank splay formed on average face (73) it is tight Face contact, the round tube hole (2) that fly cutter (7) is fastened on knife bar is interior, and the cutting tip of fly cutter cutter head (74) is in and work Make worm screw identical position.

2. a kind of dual clamping structure of worm gear fly cutter according to claim 1, it is characterised in that wherein counterbore baseplane (22) plain washer (9) is provided between the stretching screw (10), another counterbore baseplane (22) is determined with worm gear fly cutter cutter head It is provided with or without positioning plain washer (3), the counterbore baseplane (22) and the round tube hole (2) center between bit plane (71) Line is vertical.

3. a kind of dual clamping structure 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, when tightening screw axial force is produced.

4. a kind of dual clamping structure 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, with the piston rod conduct of hydraulic cylinder or pneumatic cylinder Force terminal (61), or with the push rod of electric pushrod as force terminal (61).

5. a kind of dual clamping structure of worm gear fly cutter according to claim 1, it is characterised in that the force application component (6) Using spring assembly, even resilient deformation after spring stress compression, elastic force produces axial force, and force application component (6) uses adjusting pad Circle or screw adjust elastic force.

6. a kind of dual clamping structure 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 the force application component (6) and knife bar centre bore (4) slide positioning and with knife bar quilt Moved end end face (11) connects.

7. the dual clamping structure 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 justifies staight shank and splays the acute angle theta of average face (73).

8. a kind of dual clamping structure of worm gear fly cutter according to claim 7, it is characterised in that the value of the acute angle theta Scope is between 3 °～6 °.

9. the dual clamping structure of a kind of worm gear fly cutter according to claim 8, it is characterised in that the acute angle theta is 4.5°。

10. a kind of dual clamping structure of worm gear fly cutter according to claim 1, it is characterised in that the positioning mandril (5) outer circumference surface arranges toroidal cavity of the multistage with guide angle (52), and the toroidal cavity (52) start-stop is located at described Positioning mandril (5) two ends and both ends of the surface cure process.

11. a kind of dual clamping structures of worm gear fly cutter according to claim 1, it is characterised in that the fly cutter justifies staight shank The angle δ of average face (73) and fly cutter rake face (75) of splaying is equal to work worm indexing cylinder lead angle γ, or for 0 °.