CN110052871B - Flexible driving clamp for rotary workpiece - Google Patents
Flexible driving clamp for rotary workpiece Download PDFInfo
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- CN110052871B CN110052871B CN201910412482.4A CN201910412482A CN110052871B CN 110052871 B CN110052871 B CN 110052871B CN 201910412482 A CN201910412482 A CN 201910412482A CN 110052871 B CN110052871 B CN 110052871B
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- flexible
- flexible connecting
- chuck
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- rotary
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/12—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for securing to a spindle in general
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Abstract
The invention relates to a flexible driving clamp for a rotating workpiece, which comprises a rotating chassis and a flexible chuck; the rotary chassis is arranged on the machine tool spindle and coaxially and freely rotates relative to the machine tool spindle, the flexible chuck is arranged on the rotary chassis through a flexible connecting rod, and a flexible connecting spring is sleeved on the flexible connecting rod. The invention has the beneficial effects that: the structure of flexible connecting rod, flexible connecting hole and flexible connecting spring is adopted to realize the flexible clamping of the rotary workpiece, so that the stress and elastic deformation generated in the clamping process of the cylindrical workpiece can be avoided, and the precision and quality of machining are ensured. The defects of overlarge roundness error, overlarge taper error, overlarge cylindricity error, generation of vibration lines and line cutting lines on the processing surface and the like during finish machining of cylindrical workpieces can be eliminated, and the structural precision and the smoothness of the workpieces can be obviously improved.
Description
Technical Field
The invention belongs to a mechanical rotation transmission mechanism, and particularly relates to a flexible driving clamp for a rotating workpiece.
Background
In the processing process of cylindrical workpieces, a common processing method is that a fixture (usually a chuck) is used for clamping one end of a workpiece, the other end of the workpiece is supported by a tip, but the axis of clamping force of the fixture and the center line of the tip cannot guarantee an accurate coaxial state, so that the workpiece generates certain radial stress between the fixture and the tip, the processing quality is influenced in the high-precision processing process, the roundness error of the workpiece after finish processing is overlarge, the taper of the workpiece after processing is overlarge, the cylindricity is overlarge, the vibration lines on the processing surface and the like obviously influence the smoothness. The improvement method is that a freely rotating clamp is adopted to support a workpiece, the clamp is fastened on the workpiece, and the clamp is shifted by a driving plate to rotate the workpiece; however, in an automatic production line, the clamps cannot be manually installed and detached for each workpiece, a chuck for clamping and fixing the workpiece needs to be arranged on each clamp, and the chuck is shifted by a driving plate to enable the workpiece to rotate. In the clamping mode of the workpiece, the chuck can generate additional acting force on the workpiece at the same time of clamping and fixing the workpiece, the workpiece can generate internal stress or elastic deformation including radial and axial acting force, the workpiece is deformed under the action of the internal stress or elastic recovery after the workpiece is processed, the processing quality of the workpiece is influenced, and the influence is particularly obvious in the radial processing process.
Disclosure of Invention
The invention aims to provide a technical scheme for flexibly driving a clamp by rotating a workpiece, which avoids the influence on the processing precision due to the additional acting force of the clamp.
In order to achieve the purpose, the technical scheme of the invention is as follows: a flexible driving clamp for rotating workpieces is used for clamping the rotating workpieces on a machine tool and comprises a rotating chassis and a flexible chuck; the flexible chuck is mounted on the rotating chassis through a flexible connecting rod, a flexible connecting spring is sleeved on the flexible connecting rod, one end of the flexible connecting spring is pressed against the flexible chuck, and the other end of the flexible connecting spring is pressed against the rotating chassis.
Further, in order to stably mount the flexible chuck on the rotating base plate, the flexible chuck is mounted on the rotating base plate by a plurality of flexible connecting rods equally distributed around an axis of the flexible chuck.
Furthermore, in order to realize the flexible connection effect of the flexible chuck, the rotary chassis is provided with a flexible connection hole, the flexible connection rod passes through the flexible connection hole, the flexible connection rod penetrates out of the end of the flexible connection hole and is provided with a locking nut and an end face gasket, and the flexible connection rod is fixedly connected with the flexible chuck.
Furthermore, in order to obtain a good flexible connection effect, a connection edge matched with the flexible connection rod is arranged in the flexible connection hole, and two sides of the connection edge are provided with outwards expanded taper holes.
Furthermore, a better flexible connecting hole structure is that one side of the connecting edge is an outer expansion taper hole, the taper of the outer expansion taper hole is 1:8, the length of the outer expansion taper hole is 0.77 times of the length of the flexible connecting hole, and a transition chamfer angle of 55 degrees is arranged between the outer expansion taper hole and the connecting edge; the other side of the connecting edge is provided with an inner side expansion taper hole, the taper of the inner side expansion taper hole is 1:1.66, and the length of the inner side expansion taper hole is 0.23 times that of the flexible connecting hole; the inner expanding taper hole is opposite to the flexible connecting spring.
Furthermore, in order to enable the fixture to operate stably and to be maintained conveniently, the rotary chassis is provided with a flexible connecting sleeve, the flexible connecting sleeve comprises a flexible connecting outer sleeve and a flexible connecting inner sleeve, the flexible connecting hole is formed in the flexible connecting inner sleeve, the flexible connecting inner sleeve is arranged in the flexible connecting outer sleeve, the flexible connecting outer sleeve is made of high-hardness materials, and the flexible connecting inner sleeve is made of copper.
Furthermore, the machine tool spindle is provided with a drive plate, the flexible chuck is provided with a drive block, and the drive plate drives the flexible chuck to rotate through the drive block.
Further, in order to stably clamp the workpiece, the flexible chuck is provided with at least three clamping jaws for clamping the workpiece.
The invention has the beneficial effects that: the structure of flexible connecting rod, flexible connecting hole and flexible connecting spring is adopted to realize the flexible clamping of the rotary workpiece, so that the stress and elastic deformation generated in the clamping process of the cylindrical workpiece can be avoided, and the precision and quality of machining are ensured. The defects that the roundness error is overlarge, the taper error is overlarge, the cylindricity error is overlarge, the vibration lines and the cutter moving lines are generated on the processing surface when a cylindrical workpiece is subjected to finish machining can be eliminated, the structural precision and the smoothness of the workpiece can be obviously improved, the number of times of cutter moving in the processing process is reduced, and the processing efficiency and the primary finished product qualification rate are improved.
The invention is described in detail below with reference to the figures and examples.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is an enlarged view of a portion B of FIG. 2, showing the structure of the flexible connecting sleeve and the flexible connecting rod;
FIG. 4 is a schematic view of the working state of the present invention;
fig. 5 is a functional schematic of the present invention.
Detailed Description
Referring to fig. 1 to 5, a flexible drive fixture for rotating a workpiece for chucking the rotating workpiece on a machine tool includes a rotary base 10 and a flexible chuck 20; the flexible chuck is mounted on the rotary chassis through a flexible connecting rod 30, a flexible connecting spring 32 is sleeved on the flexible connecting rod, one end of the flexible connecting spring is pressed against the flexible chuck, and the other end of the flexible connecting spring is pressed against the rotary chassis.
The flexible chuck is arranged on the rotating chassis through a plurality of flexible connecting rods, and the flexible connecting rods are distributed around the axis of the flexible chuck in an equal distribution mode.
The rotary chassis is provided with a flexible connecting hole 40, the flexible connecting rod penetrates through the flexible connecting hole, the end of the flexible connecting rod penetrating out of the flexible connecting hole is provided with a locking nut 33 and an end face gasket 34, and the flexible connecting rod is fixedly connected with the flexible chuck.
And a connecting edge 43 matched with the flexible connecting rod is arranged in the flexible connecting hole, and two sides of the connecting edge are provided with outwards expanded taper holes.
An outer expansion taper hole 44 is formed in one side of the connecting edge, the taper of the outer expansion taper hole is 1:8, the length of the outer expansion taper hole is 0.77 times that of the flexible connecting hole, and a 55-degree transition chamfer angle alpha is formed between the outer expansion taper hole and the connecting edge; the other side of the connecting edge is provided with an inner side expansion taper hole 45, the taper of the inner side expansion taper hole is 1:1.66, and the length of the inner side expansion taper hole is 0.23 times that of the flexible connecting hole; the inner expanding taper hole is opposite to the flexible connecting spring.
The rotary chassis is provided with a flexible connecting sleeve, the flexible connecting sleeve comprises a flexible connecting outer sleeve 41 and a flexible connecting inner sleeve 42, the flexible connecting hole is formed in the flexible connecting inner sleeve, the flexible connecting inner sleeve is arranged in the flexible connecting outer sleeve, the flexible connecting outer sleeve is made of high-hardness materials, and the flexible connecting inner sleeve is made of copper.
The machine tool spindle is provided with a drive plate 61, the flexible chuck is provided with a drive block 22, and the drive plate drives the flexible chuck to rotate through the drive block.
The flexible chuck is provided with at least three clamping jaws 23 for clamping a workpiece.
The first embodiment is as follows:
referring to fig. 1 to 5, a flexible driving fixture for rotating a workpiece includes a rotating base 10, a flexible chuck 20, and a flexible connecting rod 30.
The rotary chassis 10 is mounted on the machine tool spindle 60 through a set of bearings 11, is coaxial with the machine tool spindle, is fixedly connected with the machine tool spindle in the axial direction, and can rotate relative to the machine tool spindle (i.e., can freely rotate on the machine tool spindle).
The rotating chassis is provided with six flexible connecting sleeves which are distributed around the axis of the rotating chassis in an equal distribution mode. The flexible connecting sleeve comprises a flexible connecting outer sleeve 41 and a flexible connecting inner sleeve 42, the flexible connecting inner sleeve is arranged in the flexible connecting outer sleeve, the flexible connecting outer sleeve is made of high-hardness materials, and carbon tool steel is adopted in the embodiment. The flexible connecting inner sleeve is made of copper.
The flexible connecting inner sleeve is provided with a flexible connecting hole 40. The flexible connecting hole is internally provided with a connecting edge 43 matched with the flexible connecting rod, and two sides of the connecting edge are provided with outwards expanded taper holes. One side of the connecting edge is provided with an outer side expanding taper hole 44, the taper K1 of the outer side expanding taper hole is 1:8, the length L1 of the outer side expanding taper hole is 0.77 times of the length L of the flexible connecting hole, and a transition chamfer angle alpha of 55 degrees is arranged between the outer side expanding taper hole and the connecting edge. The other side of the connecting edge is provided with an inner side expanding taper hole 45, the taper K2 of the inner side expanding taper hole is 1:1.66, and the length L2 of the inner side expanding taper hole is 0.23 times of the length of the flexible connecting hole. According to engineering practice, the flexible connecting hole can well realize the function of the flexible chuck.
The flexible chuck is provided with three clamping jaws 23 for clamping a workpiece, and the three clamping jaws are equally distributed around the circumference of the axis of the flexible chuck. The flexible chuck is provided with two symmetrical drive blocks 22, which are made of copper.
The machine tool main shaft is provided with a drive plate 61, the drive plate is provided with two shift rods 62 corresponding to the driving speeds, and the shift rods of the drive plate shift a drive block to drive the flexible chuck to rotate. The driving levers in two symmetrical positions are adopted to stir the flexible chuck, so that the rotary driving force of the flexible chuck is more balanced, the flexible chuck mainly obtains the torsional driving force, the radial acting force on the workpiece is avoided, and the stress or elastic deformation of the workpiece under the action of the radial force is avoided.
The flexible chuck is installed on the rotary chassis through a flexible connecting rod 30, six flexible connecting rods are arranged on the flexible chuck, the positions of the six flexible connecting rods correspond to the flexible connecting holes of the rotary chassis, and the six flexible connecting rods are evenly distributed around the axis of the flexible chuck. Flexible connecting rod and flexible chuck fixed connection, in this embodiment, the end of flexible connecting rod is equipped with an end cap 31, and the end cap of flexible connecting rod is impressed in the hole of flexible chuck with the quiet cooperation, fixes on the flexible chuck.
The flexible connecting rod passes through a flexible connecting hole 40 of the rotary chassis (flexible connecting inner sleeve), a locking nut 33 and an end face gasket 34 are arranged at the end of the flexible connecting rod which passes through the flexible connecting hole, and the end face gasket is made of high-hardness material and is made of carbon tool steel. A retaining washer 35 is provided between the lock nut and the end washer to prevent the lock nut from loosening.
The flexible connecting rod is sleeved with a flexible connecting spring 32, one end of the flexible connecting spring is propped against the flexible chuck, and the other end of the flexible connecting spring is propped against the flexible connecting inner sleeve 42. The inner expansion taper 45 of the flexible coupling inner sleeve is opposite to the flexible coupling spring, i.e. facing the flexible coupling spring.
The pressure of the spring on the flexible connecting inner sleeve (equivalent to a rotating chassis) of the flexible chuck can be adjusted through the locking nut, so that flexible driving effects of different degrees are achieved.
As shown in fig. 4, a main center 73 (which may be mounted on the rotating base plate) is provided at the front end of the main shaft of the machine tool, both ends of the workpiece are provided with center holes, one end of the workpiece 71 is pressed against the main center 73, and the other end of the workpiece is pressed against by the rotating center 72. When the machine tool spindle 60 rotates, the drive plate 61 drives the flexible chuck 20 to rotate, and the flexible chuck drives the workpiece to rotate. In such a drive configuration, the flexible chuck is only required to provide a circumferential clamping force on the workpiece, while other accessory forces, including radial and axial thrust on the workpiece, are avoided.
When clamping a workpiece, due to workpiece irregularities (dimensional and form and position errors before being machined) and also due to manufacturing and mounting errors of the fixture (including the rotary base plate, the flexible chuck and the flexible connecting rod). If the chuck is rigidly connected to the rotating chassis, additional force of the chuck on the workpiece inevitably occurs.
The flexible drive fixture of rotatory work piece of this embodiment, flexible connection spring can make the distance between flexible chuck and the rotatory chassis keep the state that an elasticity can change, the terminal surface of rotatory chassis can be followed the axis of flexible connecting rod and is done appropriate amount of removal, the flexible connecting rod is connected along the cooperation in the flexible connecting hole of rotatory chassis, the flexible connecting rod can be at the downthehole axial displacement of flexible connecting, and carry out the axis swing, make the flexible chuck move along with the card solid position of work piece, can be called flexible drive state, additional effort has been absorbed.
The flexible connecting hole adopts a connecting edge matched with the flexible connecting rod and taper holes with two sides expanding outwards, so that the flexible connecting rod can smoothly make axial displacement along the flexible connecting hole and can generate an axis inclination angle, and the rotating chassis can smoothly adjust the position along the axis of the flexible connecting rod through the flexible connecting hole. The flexible connecting inner sleeve made of copper can reduce the abrasion of the flexible connecting rod and improve the transmission stability, and the flexible connecting inner sleeve can be replaced as a quick-wear part. The flexible connecting outer sleeve made of high-hardness materials is contacted with the high-hardness end face gasket, so that the contact friction between the end face gasket and the flexible connecting outer sleeve can be effectively resisted. The pretightening force of the flexible connecting spring and the position between the flexible chuck and the rotary chassis can be adjusted through the locking nut, and a good driving state is obtained.
The flexible driving clamp for the rotary workpiece can keep the natural state of the workpiece to the maximum extent, and avoids the influence on the machining precision. By adopting the flexible driving clamp for the rotary workpiece, the structural error and the defect of the cylindrical workpiece during finish machining can be eliminated, the structural precision and the smoothness of the workpiece can be obviously improved, the number of times of feed in the machining process is reduced, and the machining efficiency and the primary finished product qualification rate are improved.
Claims (6)
1. A flexible driving clamp for a rotary workpiece is used for clamping the rotary workpiece on a machine tool and is characterized by comprising a rotary chassis and a flexible chuck; the flexible chuck is mounted on the rotating chassis through a flexible connecting rod, a flexible connecting spring is sleeved on the flexible connecting rod, one end of the flexible connecting spring is pressed against the flexible chuck, and the other end of the flexible connecting spring is pressed against the rotating chassis;
the machine tool spindle is provided with a drive plate, the flexible chuck is provided with a drive block, and the drive plate drives the flexible chuck to rotate through the drive block;
the flexible chuck is provided with at least three clamping jaws for clamping a workpiece.
2. A rotary workpiece flexible drive chuck according to claim 1 wherein the flexible chuck is mounted on the rotary base plate by a plurality of flexible connecting rods equally spaced about the axis of the flexible chuck.
3. A rotary workpiece flexure drive chuck according to claim 1, wherein the rotary base plate is provided with a flex connection hole, the flexible connection rod passes through the flex connection hole, the end of the flexible connection rod passing through the flex connection hole is provided with a lock nut and an end washer, and the flexible connection rod is fixedly connected with the flexible chuck.
4. The flexible driving fixture for rotary workpieces as claimed in claim 3, wherein the flexible connecting holes are internally provided with connecting edges matched with the flexible connecting rods, and two sides of the connecting edges are provided with conical holes expanding outwards.
5. The flexible driving fixture for the rotary workpieces as claimed in claim 4, wherein one side of the connecting edge is an outer expansion taper hole, the taper of the outer expansion taper hole is 1:8, the length of the outer expansion taper hole is 0.77 times of the length of the flexible connecting hole, and a transition chamfer angle of 55 degrees is arranged between the outer expansion taper hole and the connecting edge; the other side of the connecting edge is provided with an inner side expansion taper hole, the taper of the inner side expansion taper hole is 1:1.66, and the length of the inner side expansion taper hole is 0.23 times that of the flexible connecting hole; the inner expanding taper hole is opposite to the flexible connecting spring.
6. A flexible driving fixture for rotary workpieces as claimed in claim 3, wherein the rotary chassis is provided with a flexible connecting sleeve, the flexible connecting sleeve comprises a flexible connecting outer sleeve and a flexible connecting inner sleeve, the flexible connecting holes are arranged in the flexible connecting inner sleeve, the flexible connecting inner sleeve is arranged in the flexible connecting outer sleeve, the flexible connecting outer sleeve is made of high hardness material, and the flexible connecting inner sleeve is made of copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910412482.4A CN110052871B (en) | 2019-05-17 | 2019-05-17 | Flexible driving clamp for rotary workpiece |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910412482.4A CN110052871B (en) | 2019-05-17 | 2019-05-17 | Flexible driving clamp for rotary workpiece |
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| Publication Number | Publication Date |
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| CN110052871A CN110052871A (en) | 2019-07-26 |
| CN110052871B true CN110052871B (en) | 2020-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910412482.4A Active CN110052871B (en) | 2019-05-17 | 2019-05-17 | Flexible driving clamp for rotary workpiece |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115533743A (en) * | 2022-08-23 | 2022-12-30 | 浙江娃哈哈智能机器人有限公司 | Multistation quick change blade clamping device |
| CN116638357B (en) * | 2023-07-27 | 2023-10-03 | 烟台东星集团有限公司 | Clamping device for machining integrated forging oil cylinder shaft |
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| GB782343A (en) * | 1954-10-18 | 1957-09-04 | Gleason Works | Improvements relating to machine tools, particularly gear-cutting machines |
| CN102773774A (en) * | 2012-07-06 | 2012-11-14 | 北京信泰德利华自动化技术有限公司 | Roller drive plate clamping tool |
| CN202684136U (en) * | 2012-08-08 | 2013-01-23 | 陈德明 | Chuck and machine tool |
| CN104227345A (en) * | 2014-08-21 | 2014-12-24 | 贵州凯星液力传动机械有限公司 | Processing method for high-precision thin step shaft and grinding chuck for processing method |
| CN105058177A (en) * | 2015-08-31 | 2015-11-18 | 苏州柏德纳科技有限公司 | Clamping tool for high-precision cylindrical workpiece |
| CN205703420U (en) * | 2016-04-14 | 2016-11-23 | 四川重汽王牌兴城液压件有限公司 | A kind of axle hub brake drum assembly turning clamp |
| CN205733952U (en) * | 2016-06-23 | 2016-11-30 | 无锡市国松环保机械有限公司 | A kind of gear box casing clamp for machining |
| DE102015119061B3 (en) * | 2015-11-06 | 2016-12-15 | Ott-Jakob Spanntechnik Gmbh | jig |
-
2019
- 2019-05-17 CN CN201910412482.4A patent/CN110052871B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB782343A (en) * | 1954-10-18 | 1957-09-04 | Gleason Works | Improvements relating to machine tools, particularly gear-cutting machines |
| CN102773774A (en) * | 2012-07-06 | 2012-11-14 | 北京信泰德利华自动化技术有限公司 | Roller drive plate clamping tool |
| CN202684136U (en) * | 2012-08-08 | 2013-01-23 | 陈德明 | Chuck and machine tool |
| CN104227345A (en) * | 2014-08-21 | 2014-12-24 | 贵州凯星液力传动机械有限公司 | Processing method for high-precision thin step shaft and grinding chuck for processing method |
| CN105058177A (en) * | 2015-08-31 | 2015-11-18 | 苏州柏德纳科技有限公司 | Clamping tool for high-precision cylindrical workpiece |
| DE102015119061B3 (en) * | 2015-11-06 | 2016-12-15 | Ott-Jakob Spanntechnik Gmbh | jig |
| CN205703420U (en) * | 2016-04-14 | 2016-11-23 | 四川重汽王牌兴城液压件有限公司 | A kind of axle hub brake drum assembly turning clamp |
| CN205733952U (en) * | 2016-06-23 | 2016-11-30 | 无锡市国松环保机械有限公司 | A kind of gear box casing clamp for machining |
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| CN110052871A (en) | 2019-07-26 |
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