CN200970689Y

CN200970689Y - Dividing head

Info

Publication number: CN200970689Y
Application number: CN 200620130865
Authority: CN
Inventors: 杨秋荣
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-08-12
Filing date: 2006-08-12
Publication date: 2007-11-07
Anticipated expiration: 2016-08-12

Abstract

A graduation head as an annex of machine tool graduates through the separation and meshing of a rack and a gear. One end of rack has threads, and is equipped with screw sets. The thread swing sets are installed in the swinging shaft. The rack can swing around the swinging shaft axis and swing, it can also move through the rotation and axial sets. When it indexes, no matter the number of the necessary rotated gear teeth is an integer or not, it can be achieved through rotating the gear and the rack as well. In order to make mobile rack more accurate, it sets up a sub-head margin scale ring. This sub-head has the other implementation program, which uses a worm rod to replace the rack, a worm gear to replace the gear. At this time, in order to prevent a possible rotation of the worm rod, it is possible to install a limiting mechanism on the worm rod. The greatest features of this sub-head are: simple structure, easy operation, and high degree accuracy.

Description

Dividing head

Affiliated technical field

The utility model is the invention about general dividing head in the machine tool accessories.The dividing head that it provides can carry out calibration to workpiece.

Background technology

Though present known dividing head can carry out calibration to workpiece, its complex structure, manufacturability is poor.It includes worm gear, worm screw, cylindrical gear of straight tooth and helical gear etc., has the index dial of many blind holes especially in addition, has therefore increased manufacture difficulty and workload.

Summary of the invention

In order to overcome the weak point of known dividing head, the utility model provides a kind of new index head, and it not only can carry out calibration to workpiece, and simple in structure, good manufacturability, also has higher indexing accuracy simultaneously.

The dividing head that the utility model is related is to utilize the separation of rack and pinion and engagement to come calibration.Gear (above scale is arranged) is enclosed within on the main shaft of dividing head, and the two is fixed together.The afterbody of tooth bar has screw thread, and is furnished with thread bush, and scale is arranged on the thread bush.And thread bush is contained in the swinging axle, and the axial line of thread bush and the axial line of swinging axle are perpendicular.Tooth bar can be swung around the axial line of swinging axle, so it can separate or engagement with gear.Tooth bar also can move axially by rotating thread bush.

During calibration, if the number of teeth of gear just in time can satisfy the needs of calibration, just in time require gear rotation to cross an integer number of teeth when being calibration, calibration so just: mention tooth bar, and make the required excessively number of teeth of gear rotation, and then depress tooth bar, and make it and the gear tight mesh, clamp dividing head spindle at last and get final product.

Otherwise, if the number of teeth that requires gear rotation to cross is not an integer, so just should after mentioning tooth bar, make gear rotation cross one and the accurate immediate integer number of teeth of calibration earlier, certainly also can leave the error angle this moment, and then make the thread bush that is contained in the tooth bar afterbody turn over an angle.Can not move axially because of thread bush this moment, so tooth bar will move axially a distance.And make this distance just in time equal above-mentioned error angle pairing arc length on the gear compound graduation garden.Depress tooth bar, make it and the gear tight mesh.Clamping dividing head spindle at last gets final product.

The above is to utilize the separation of rack and pinion and engagement to come calibration.But the separation that utilizes worm and wheel in fact and engagement also calibration (gear and worm gear are all regarded as gear herein, worm gear is actually a kind of in all multi-gears, is the metamorphosis of helical gear), its principle is identical.In order to prevent that possible rotation from appearring in worm screw in the calibration process, need make (or installation) position-limit mechanism at the end that worm screw is not adorned thread bush.For example on worm screw, make relative parallel plane, and it is cut paste to insert and extract in the fixing gathering sill.Other 26S Proteasome Structure and Function is identical.

For angle that thread bush is turned over is more accurate, can be by means of the difference calibration loop.The difference calibration loop is fixed on the swinging axle.Has only one section scale on the difference calibration loop.Scale on the difference calibration loop is compared with scale suitable on the thread bush, and the difference of physical size is arranged, and sees by the ratio of two kinds of scales like this, just can make the corner reading of thread bush more accurate.

The beneficial effects of the utility model are: simple in structure, easy and simple to handle.Spend kind of middle rack and gear is a tight mesh at branch in addition, also be fixed as one with nut between thread bush, difference calibration loop, swinging axle and the tooth bar, the gap that does not influence indexing accuracy exists, so indexing accuracy improves.

Description of drawings:

Fig. 1 is a view (base portion is not drawn) of this dividing head, and Fig. 2 is that the A-A of Fig. 1 analyses and observe.In the drawings, the 1st, back tightening nut, the 2nd, thread bush, the 3rd, difference calibration loop, the 4th, swinging axle, the 5th, hold-down nut, the 6th, gear, the 7th, dividing head spindle, the 8th, tooth bar, the 9th, the handwheel that main shaft is rotated, the 10th, the handle of main shaft clamp mechanism.

The specific embodiment is referring to accompanying drawing

(1) if, require gear 6 just in time to turn over the integer number of teeth during calibration, should operate like this: mention tooth bar 8, make it and gear 6 breaks away from engagement.Rotate handwheel 9, make gear 6 turn over the required number of teeth, depress tooth bar 8, make it and gear 6 tight mesh.Move handle 10, main shaft 7 is clamped, one time calibration finishes.

(2) if, the number of teeth that requires gear 6 to turn over during calibration is not an integer, so just should operate like this: mention tooth bar 8, make it and gear 6 breaks away from engagement.Rotate handwheel 9, make gear 6 turn over one with the accurate immediate integer number of teeth of calibration (no matter belong to which kind of situation during practical operation, can forward gear 6 and main shaft 7 to position as far as possible accurately according to the scale on the gear 6 fully), so far initial calibration is finished.Also can leave the error angle after initial calibration is finished, need revisal.Unclamp back tightening nut 1 and hold-down nut 5, make thread bush 2 turn over an angle.Because of thread bush 2 does not move axially, so tooth bar 8 must move axially.According to the pitch and the angle that it turns over of thread bush 2, just can know the distance that tooth bar 8 moves.And make this distance equal the arc length of error angle correspondence on the calibration garden of gear 6.Tighten back tightening nut 1 and hold-down nut 5.Depress tooth bar 8, make it and gear 6 tight mesh, secondary revisal is so far finished.The error angle that the secondary revisal has stayed when having eliminated initial calibration.Move handle 10, main shaft 7 is clamped, calibration finishes.

Claims

1, a kind of dividing head is to be made of dividing head spindle and the gear, handwheel and the main shaft clamp mechanism that are fixed on above it, and it is characterized in that: it has swing type error correction mechanism.

2, dividing head according to claim 1, it is characterized in that: swing type error correction mechanism is made of tooth bar, thread bush, difference calibration loop, swinging axle, back tightening nut and hold-down nut, tooth bar one end has screw thread, and thread bush and back tightening nut all are contained on this screw thread; Thread bush is contained in again in the swinging axle, and its axial line is perpendicular with the axial line of swinging axle; Hold-down nut is contained on the external screw thread of thread bush one end; The difference calibration loop is fixed on the swinging axle.

3, dividing head according to claim 1, it is characterized in that: swing type error correction mechanism is made of worm screw, thread bush, difference calibration loop, swinging axle, back tightening nut and hold-down nut, the end of worm screw has screw thread, thread bush and back tightening nut all are contained on this screw thread, and the other end has the mechanism of anti-its rotation; Thread set is in swinging axle, and its axial line is perpendicular with the axial line of swinging axle; Hold-down nut is contained on the external screw thread of thread bush one end; The difference calibration loop is fixed on the swinging axle.

4, dividing head according to claim 2 is characterized in that: scale is all arranged on difference calibration loop and the thread bush, and the scale on the difference calibration loop is compared with scale suitable on the thread bush, and the difference of physical size is arranged.