CN113752162A - Centre surrounding clamping type driving clamp - Google Patents
Centre surrounding clamping type driving clamp Download PDFInfo
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- CN113752162A CN113752162A CN202111150816.9A CN202111150816A CN113752162A CN 113752162 A CN113752162 A CN 113752162A CN 202111150816 A CN202111150816 A CN 202111150816A CN 113752162 A CN113752162 A CN 113752162A
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- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 7
- 238000010030 laminating Methods 0.000 abstract 1
- 238000003754 machining Methods 0.000 description 13
- 238000012545 processing Methods 0.000 description 11
- 230000003287 optical effect Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/061—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically
- B24B41/062—Work supports, e.g. adjustable steadies axially supporting turning workpieces, e.g. magnetically, pneumatically between centres; Dogs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/067—Work supports, e.g. adjustable steadies radially supporting workpieces
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
- B24B5/35—Accessories
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Abstract
The invention provides a centre encircling clamping type driving clamp which consists of a clamp base, a sliding positioning live centre assembly and an encircling clamping assembly; in the sliding positioning live center assembly, a live center penetrates through the center of a clamp base, a sliding connection assembly and a support spring are sequentially sleeved on a live center rod, and the bottom of the support spring is arranged on the clamp base; in the encircling type clamping assembly, a plurality of groups of clamping units are uniformly distributed and fixed on a clamp base outside the circumference of the live center; among the clamping unit, the rough surface laminating chuck is articulated with drive power arm one end, and drive power arm middle part articulates on arm of force support frame, and the drive power arm other end articulates on sliding connection subassembly, arm of force support frame is fixed on the anchor clamps base. The invention can synchronously position and clamp, realize reliable driving rotation and simultaneously ensure high-precision grinding on the basis of ensuring that parts can be quickly clamped and disassembled in the grinding process.
Description
Technical Field
The invention belongs to the technical field of driving clamps, and particularly relates to a centre surrounding clamping type driving clamp which is suitable for grinding equipment.
Background
Grinding is a machining method for removing materials which is widely used, and more specifically, cutting for machining the surface of a workpiece using a grinding tool such as a grinding wheel rotating at high speed.
The grinding process is associated with a finishing process in the machining, namely: the processing amount is small and the processing precision is high.
The grinding is used for processing inner and outer cylindrical surfaces, conical surfaces and planes of various workpieces, and special and complex forming surfaces such as threads, gears and splines, and shaft parts are the most main processing objects for grinding.
Therefore, when the shaft parts are machined by grinding with high machining precision, the requirements on the positioning precision, the clamping reliability and the surface quality of the machined workpieces of the shaft parts are high.
In the existing grinding processing technology, the following two main modes are adopted for positioning and clamping shaft parts:
the first mode is a positioning, clamping and driving mode of 'chuck and tip', namely, a chuck is adopted to clamp one end part of a shaft part, and the other end of the shaft part is tightly propped by a tailstock tip of a machine tool. The axle type part realizes axial positioning through the unilateral top on the one hand, on the other hand is pressed from both sides tightly by the chuck, and realize the synchronous revolution drive to axle type part through the chuck, finally realize the location to axle type part, press from both sides tightly and drive, this kind of through the device clamping work piece of "one end chuck presss from both sides tight drive, the top location of the other end", because location and clamping go on step by step, the processing clamping operation that leads to axle type part needs to consume a large amount of physical power of operator, cause machining efficiency to be lower, in addition, because chuck and top are installed respectively, make to have the axiality poor between the two, repeated location leads to positioning accuracy poor, easy unstability when carrying out the work piece clamping, the eccentric condition of drive can appear in serious time, make the part machining precision reduce, cause higher useless rate.
The second mode is a positioning, clamping and driving mode of 'double tips and driving shifting forks', namely, two ends of a shaft part are oppositely positioned through a group of tips to tightly push the shaft part, then, the driving shifting forks (namely, chicken heart chucks) are manually installed in the middle of the shaft part through an operator, and the shaft part is driven to rotate through the driving shifting forks. The 'double centers and the driving shifting forks' ensure the axial positioning precision of shaft-like parts to a certain extent, but in addition, the working procedure of manually installing the driving shifting forks is still needed, a large amount of physical power of operators is still needed to be consumed, the processing working hours are longer, and the efficiency is lower; in addition, the driving shifting fork is in a radial clamping mode, and the driving shifting fork is irregular in structure, so that the shaft parts are inevitably subjected to radial pressure after clamping, and positioning errors are generated on the shaft parts; in addition, the serious centrifugal vibration easily causes the transmission failure of the workpiece, and the workpiece can not finish normal processing without rotating, even causing safety accidents.
The common positioning, clamping and driving mode cannot simultaneously meet the requirements on the positioning precision and the clamping reliability of the shaft parts and the surface quality of the machined workpieces, and in addition, a large amount of physical strength of operators is seriously consumed, so that the machining working hours are long, and particularly, the machining cost and the machining time are greatly increased due to the problem of low efficiency in batch production.
To above-mentioned problem, patent CN110000700A still discloses a grinding machine anchor clamps, is a top location and the synchronous cooperation of chuck clamping realize carrying out the grinding anchor clamps of clamping to axle type part, through the form of the tight axle type part of the top cooperation of a plurality of rotatable clamp blocks of chuck drive to guarantee the precision and the stability of clamping, reduce artifical unloading and also conveniently realize automaticly. Although the grinding machine clamp can reduce manual loading and unloading, provide processing efficiency and improve the coaxial precision and the positioning precision of shaft part clamping to a great extent, the clamping form of the clamping block is difficult to play a clamping role, so that the workpiece is slipped and transmission failure is caused to cause the workpiece to not rotate, the form basically only can realize the clamping effect, and the driving function is difficult to realize; the sliding block is approximately in line contact with the workpiece, so that the surface of the workpiece is easily scratched; in addition, in the driving process of the structure, a rotary table is fixedly connected to the rear end of the top, one end of a connecting rod is fixedly connected to the rotary table, the other end of the connecting rod penetrates through a slotted hole formed in a clamping ring to be fixedly connected, the rotary table is in transmission connection with a power device, and the power device is arranged on a machine tool. "this kind of connection structure is eccentric structure, also can produce radial eccentric force in the rotation drive process, influences the machining precision.
Disclosure of Invention
Aiming at the defects in the prior art, the invention discloses a centre surrounding clamping type driving clamp, which can be synchronously positioned and clamped, realizes reliable driving rotation and can also ensure high-precision grinding on the basis of ensuring that parts can be quickly clamped and disassembled in grinding.
The technical scheme of the invention is as follows by combining the attached drawings of the specification:
a centre embracing clamping type driving clamp comprises a clamp base 1, a sliding positioning live centre assembly 2 and an embracing type clamping assembly 3;
in the sliding positioning live center assembly 2, a live center 201 penetrates through the center of a clamp base 1, a sliding connection assembly and a support spring 202 are sequentially sleeved on a live center rod 2012, and the bottom of the support spring 202 is arranged on the clamp base 1;
in the encircling type clamping assembly 3, a plurality of groups of clamping units are uniformly distributed and fixed on the clamp base 1 at the outer side of the circumference of the live center 201;
in the clamping unit, the rough surface attaching clamp 301 is hinged with one end of a driving force arm 303, the middle part of the driving force arm 303 is hinged on a force arm support frame 306, the other end of the driving force arm 303 is hinged on the sliding connection assembly, and the force arm support frame 306 is fixed on a clamp base 1;
under the action of an axial external force, the live center 201 drives the sliding connection assembly to extrude the supporting spring 202 to move axially, and drives the driving force arm 303 to swing inwards through the sliding connection assembly, so that the thick-face attaching clamp 301 clamps the live center 201 in an encircling manner.
Further, the sliding connection assembly is composed of a driving sliding sleeve 203 and a moment arm connecting sleeve 204;
the driving sliding sleeve 203 is sleeved on the center rod 2012, the limiting outer edge at one end of the driving sliding sleeve 203 abuts against the end surface at the bottom of the center conical surface 2011, and the limiting outer edge at the other end of the driving sliding sleeve 203 abuts against the top of the supporting spring 202;
the force arm connecting sleeve 204 is arranged on the outer side of the driving sliding sleeve 203 and is limited between the limiting outer edges at two ends of the driving sliding sleeve 203 along the axial direction;
and connecting lug frames which are correspondingly hinged with the driving force arms 303 one by one are distributed on the outer side of the circumference of the force arm connecting sleeve 204.
Further, the taper range of the tip conical surface 2011 of the live tip 201 is as follows: 30 to 120.
Further, the slide locating live center assembly 2 further comprises: a limit nut 205;
the tail part of the centre rod 2012 is a centre rod thread section 2013 with an external thread, and the limiting nut 205 is connected with the centre rod thread section 2013 in a matching manner, so that when the live centre 201 has a reverse movement trend under the action of the spring elasticity of the supporting spring 202, the live centre 201 is limited on the bottom of the clamp base 1 along the axial direction through the limiting nut 205.
Further, the clamping units are three to six groups.
Further, in the clamping unit, the rough surface attaching clamp 301 and the driving force arm 303 are hinged through a first connecting rivet 302, the driving force arm 303 and the force arm support frame 306 are hinged through a second connecting rivet 304, and the driving force arm 303 and the sliding connection assembly are hinged through a third connecting rivet 305.
Further, the driving arm 303 is in an inward opening L-shaped or C-shaped structure.
Further, the shape of the attaching surface of the rough surface attaching clamp 301 is matched with the shape of the outer circumferential surface of the clamping end of the shaft part.
Furthermore, the joint surface of the rough joint chuck 301 is a plane, a cylindrical smooth arc surface or a cylindrical inner spline arc surface.
Further, the base main body 101 of the clamp base 1 is of a two-stage step structure;
the bottom of the base main body 101 is provided with a base main shaft matching conical surface matched with the outer contour shape of a machine tool main shaft;
base flange connecting holes fixedly connected with a machine tool spindle are uniformly formed in the circumferential direction of the bottom step of the base main body 101;
the center of the base main body 101 is provided with a base center hole 104 for the live center 201 to pass through;
the center of the top surface of the top step of the base body 101 is provided with a base spring installation groove 105 for installing a supporting spring 202.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the center surrounding clamping type driving clamp, the live center for positioning and the clamping block assembly for clamping driving are combined and linked, positioning and clamping on the same axis are realized through one-time clamping, and the positioning and clamping precision is greatly guaranteed.
2. According to the center surrounding clamping type driving clamp, the live center for positioning and the clamping block assembly for clamping driving are combined and linked, positioning, clamping and driving on the same axis are realized through one-time clamping, the mounting and dismounting are convenient, the labor intensity of operators is greatly reduced, the machining efficiency is improved, the production cost is saved, and the requirements of automatic production and machining are met.
3. According to the center encircling clamping type driving clamp, shaft parts to be ground are clamped and fixed in an encircling posture through the rough surface attaching clamp heads which are concentrically distributed and designed, so that radial clamping force is uniformly applied, radial runout caused by eccentricity is avoided, and reliable clamping is realized.
4. According to the centre encircling clamping type driving clamp, the rough surface attaching clamp clamps and fixes the shaft part to be ground in an encircling posture, the rough surface attaching clamp is designed to effectively prevent the clamp from scratching the surface of the part, and the surface quality of the part after grinding is guaranteed.
5. According to the center encircling clamping type driving clamp, reliable driving of the shaft parts is realized on the basis that the clamping blocks designed in encircling arrangement reliably clamp the shaft parts, stable rotation in the grinding process of the shaft parts is ensured, and the grinding precision is ensured.
6. The centre encircling clamping type driving clamp has the advantages of simple and ingenious mechanism design, low manufacturing and maintenance cost, easiness in installation, convenience in clamping and placing and suitability for popularization and application.
Drawings
FIG. 1 is a schematic three-dimensional structure diagram of the center embracing clamping type driving clamp of the invention;
FIG. 2 is a front view of the center embracing clamp type driving clamp of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
fig. 4 is a top view of the tip embracing clamp type driving clamp of the present invention;
fig. 5 is a bottom view of the tip embracing clamp type driving clamp of the present invention;
fig. 6 is a bottom view of the tip embracing clamp type driving clamp of the present invention;
fig. 7 is an exploded view of a sliding positioning live center assembly in the center embracing clamping type driving clamp according to the present invention.
In the figure:
1, a clamp base, 2, a sliding positioning live center assembly and 3, an encircling clamping assembly;
101 a base main body, 102 a base main shaft matching conical surface, 103 a base flange connecting hole,
104 a center hole of the base center, 105 a spring mounting groove of the base;
201 live centre, 202 supporting spring, 203 driving sliding sleeve,
204 moment arm connecting sleeves and 205 limiting nuts;
301 a rough surface of which is attached to the chuck, 302 a first connecting rivet, 303 a driving force arm,
304 a second attachment rivet, 305 a third attachment rivet, 306 a moment arm support;
2011 tip taper, 2012 tip rod, 2013 tip rod thread section.
Detailed Description
For clearly and completely describing the technical scheme and the specific working process thereof, the specific implementation mode of the invention is as follows by combining the attached drawings of the specification:
in the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
The invention discloses a centre surrounding clamping type driving clamp, which mainly comprises a clamp base 1, a sliding positioning live centre assembly 2 and a surrounding clamping assembly 3, as shown in figure 1; wherein:
the fixture base 1 is used as a supporting and connecting base body of the whole fixture and is used for matching, installing and connecting the driving fixture and a machine tool spindle of a grinding machine tool; the sliding positioning live center assembly 2 is used as a positioning part and penetrates through the center of the end face of the clamp base 1 along the axial direction and is installed in a sliding manner; the encircling type clamping assembly 3 is used as a clamping part and is circumferentially fixed on the end surface of the clamp base 1 in an encircling manner, one end of the encircling type clamping assembly 3 is connected with the sliding positioning live center assembly 2 positioned at the central position, and the other end of the encircling type clamping assembly realizes clamping of shaft parts; the clamp realizes one-step positioning and clamping through the linkage design of the sliding positioning live center assembly 2 and the encircling type clamping assembly 3.
The following detailed description is made for each specific component of the tip embracing clamping type driving clamp in combination with the attached drawings of the specification:
as shown in fig. 2, 3, 4, 5 and 6, the base main body 101 of the clamp base 1 is a two-stage cylindrical table structure coaxially arranged, and the diameter of the upper-layer circular table of the base main body 101 is smaller than that of the lower-layer circular table of the base main body 101, so that a circular connecting flange structure is formed in the circumferential direction of the lower-layer circular table, and six base flange connecting holes 103 are uniformly formed in the circular connecting flange structure at intervals of 60 ° angles; a frustum groove with a narrow inner part and a wide outer part is concentrically arranged at the bottom of the lower layer of the circular truncated cone, and the side wall of the frustum groove is a base main shaft matching conical surface 102; a center hole 104 of the base center, which penetrates through the base main body 101 along the axial direction, is formed in the center position of the base main body; the center of the upper surface of the upper round table of the base main body 101 is provided with a base spring installation groove 105, and the inner diameter of the base spring installation groove 105 is larger than that of the center hole 104 of the base center.
As mentioned above, the fixture base 1 serves as a supporting and connecting base of the whole fixture and is used for being installed and connected with a machine tool spindle of a grinding machine tool in a matching manner; wherein: the conical table groove formed in the bottom of the base main body 101 is matched with the conical surface of the machine tool main shaft of the grinding machine tool through the base main shaft matching conical surface 102 on the side surface so as to ensure the coaxial positioning precision of the base main body 101 and the machine tool main shaft, and then the annular connecting flange structure on the lower-layer conical table of the base main body 101 is fixedly connected with the machine tool main shaft of the grinding machine tool through six bolts which are matched and correspond to the base flange connecting holes 103 one by one, so that the high coaxiality and reliable fixed connection of the whole clamp base 1 and the machine tool main shaft are realized.
As shown in fig. 2, 3, 6 and 7, the slide locating live center assembly 2 comprises: the movable center 201, a supporting spring 202, a driving sliding sleeve 203, a force arm connecting sleeve 204 and a limiting nut 205; wherein:
the live center 201 is used as a main positioning part and coaxially penetrates through the base center hole 104 in the center of the base main body 101, and a gap is reserved between the outer circumferential side wall of the live center 201 and the inner circumferential side wall of the base center hole 104, so that the live center 201 can freely slide in a reciprocating manner relative to the base main body 101 in the axial direction;
the taper of the tip conical surface 2011 at the top of the live center 201 can be adjusted according to the actual processing condition, and the taper range of the tip conical surface 2011 is as follows: 30 ° to 120 °; the upper part of the tip rod 2012 coaxially arranged at the bottom of the tip conical surface 2011 is an optical axis rod section, and the lower part of the tip rod 2012 is a tip rod thread section 2013 processed with an external thread;
the supporting spring 202 is coaxially sleeved on an apex rod 2012 of the live center 201, and the bottom of the supporting spring 202 is axially supported and radially limited and installed in a base spring installation groove 105 formed in the center of the upper surface of the upper round table of the base main body 101;
the driving sliding sleeve 203 is sleeved on the optical axis rod section at the upper part of the center rod 2012 of the live center 201 in an axial sliding manner, the top of the driving sliding sleeve 203 is in contact connection with the bottom of the center conical surface 2011 of the live center 201, the bottom of the driving sliding sleeve 203 is in support connection with the top of the supporting spring 202, and the driving sliding sleeve 203 axially slides along the center rod 2012 under the condition of overcoming the elasticity of the supporting spring 202;
the driving sliding sleeve 203 is of a cylindrical structure, two axial ends of the driving sliding sleeve 203 are provided with limiting outer edges extending outwards in the radial direction, an annular mounting groove is formed in the middle section of the driving sliding sleeve 203, the force arm connecting sleeve 204 is coaxially sleeved in the annular mounting groove in the middle section of the driving sliding sleeve 203, the top of the force arm connecting sleeve 204 abuts against the bottom of the limiting outer edge on the upper portion of the driving sliding sleeve 203, and the bottom of the force arm connecting sleeve 204 abuts against the top of the limiting outer edge on the lower portion of the driving sliding sleeve 203;
in the real-time mode, three groups of clamping units are arranged in the encircling clamping component 3, so that three groups of connecting lug frames are uniformly fixed on the outer circumferential side of the force arm connecting sleeve 204, and each group of connecting lug frames consists of two symmetrical and parallel lug plates;
the force arm connecting sleeve 204 is respectively and correspondingly connected with the clamping units in the encircling type clamping assembly 3 through connecting lugs, and when the force arm connecting sleeve 204 slides along the axial direction of the live center 201 along with the driving sliding sleeve 203, the clamping units are further driven to move;
the driving sliding sleeve 203 and the force arm connecting sleeve 204 are matched to form a sliding connection assembly together so as to realize the linkage relationship between the live center 201 and the clamping unit in the encircling type clamping assembly 3, wherein the driving sliding sleeve 203 is used for realizing the axial sliding along the live center 201, and the force arm connecting sleeve 204 is used for realizing the connection with the clamping unit;
after the center rod 2012 of the live center 201 penetrates through the center hole 104 of the base center of the base main body 101, the center rod thread section 2013 at the lower part of the center rod 2012 extends out of the bottom surface of the base main body 101, the limit nut 205 is arranged on the center rod thread section 2013 in a matching manner, after one end of a center conical surface 2011 of the live center 201 abuts against a workpiece, the bottom of the center conical surface 2011 abuts against and drives the sliding sleeve 203 to axially slide, then the sliding sleeve 203 abuts against and drives the supporting spring 202 to be compressed and deformed, and under the action of the return elastic force of the supporting spring 202, the live center 201 generates a reverse movement trend, at the moment, the limit nut 205 is screwed on the center rod thread section 2013 of the center rod 2012 at the tail part of the live center 201 to tightly press and attach to the bottom surface of the base main body 101, so that the axial locking limit of the live center 201 is realized.
As shown in fig. 2, 3 and 4, the encircling type clamping assembly 3 is composed of three groups of clamping units with identical structures, and the three groups of clamping units are uniformly distributed on the top surface of the base main body 101 outside the live center 201 along the circumferential direction;
the clamping unit mainly includes: a rough surface joint clamping head 301, a first connecting rivet 302, a driving force arm 303, a second connecting rivet 304, a third connecting rivet 305 and a force arm supporting frame 306; wherein:
the upper part, the middle part and the lower part of the driving force arm 303 are respectively provided with a hinge point, in order to avoid interference with a live center 201 in the middle of a circle center and a shaft part to be clamped and installed, the driving force arm 303 adopts an L-shaped structure, a C-shaped structure and the like with an inward opening, and in the specific embodiment, the driving force arm 303 adopts an L-shaped structure;
the moment arm support frames 306 and the driving force arms 303 are arranged in a one-to-one correspondence manner, and the moment arm support frames 306 are vertically and fixedly arranged on the top surface of the base main body 101, in the present embodiment, the moment arm support frames 306 and the base main body 101 are an integrally formed structure, as shown in fig. 3, the moment arm support frames 306 are provided with moment arm installation grooves;
the moment arm support frame 306 is used for providing support for the driving force arm 303, the structural form of the moment arm support frame can be modified adaptively, and the design of the moment arm support frame meets the functional requirements of good manufacturability, material saving, interference avoidance and the like;
the front surface of the rough surface attaching clamp 301 is a clamping end, and the back surface is a connecting end; wherein:
the structural form of the front clamping end of the rough surface joint chuck 301 can be designed and processed according to actual conditions, so that different rough surface joint chucks 301 can be replaced according to the direct size of the shaft workpiece to be clamped or the structural characteristics of the clamped surface, and the matching degree of workpiece clamping is improved; for example:
for a shaft part with a smaller shaft diameter, as shown in fig. 1, in the present embodiment, a clamping end of the rough surface attaching clamp 301 adopts a planar structure to clamp the shaft part;
for optical axis type shaft parts with larger shaft diameter, the clamping end of the rough surface attaching clamp 301 adopts a cylindrical optical arc surface matched with the optical axis surface clamped by the shaft parts;
for a spline shaft type part, the clamping end of the rough surface fitting chuck 301 adopts a cylindrical inner spline cambered surface with an inner spline groove, which is matched with a spline shaft surface clamped by the shaft type part;
the back connecting end of the rough surface attaching chuck 301 is hinged to the upper hinge point of the driving force arm 303 through the first connecting rivet 302, so that the rough surface attaching chuck 301 can swing back and forth around the first connecting rivet 302 relative to the driving force arm 303, the rough surface attaching chuck 301 can be better attached and clamped with the shaft part to be clamped, the surface of the workpiece cannot be extruded and damaged due to the fact that excessive clamping force is applied to the workpiece while clamping force is ensured, and the clamping end structure of the rough surface attaching chuck 301 is matched, and the clamping influence of the rough surface attaching chuck 301 on the surface quality requirement of the workpiece is further ensured;
the middle hinge point of the driving force arm 303 is hinged to two sides of the force arm mounting groove at the top of the force arm support frame 306 through the second connecting rivet 304, and the force arm support frame 306 provides a rotating support for the driving force arm 303 and also provides a space for the rotation of the rough surface attaching chuck 301.
The lower hinge point of the driving force arm 303 is hinged with the force arm connecting sleeve 204 connecting ear rack through a third connecting rivet 305, and the driving force arm 303 is hinged with the force arm connecting sleeve 204 connecting ear rack in a one-to-one correspondence manner;
each clamping unit is centrosymmetric about the axis of the live center 201, and the clamping end of each clamping unit about the rough surface attaching clamp head 301 of the live center 201 faces the axial direction of the live center 201, so that the clamping force applying direction of the rough surface attaching clamp head 301 faces the axial direction of the shaft part to be clamped, and reliable clamping of the shaft part is realized;
in the encircling type clamping assembly 3, the number of the clamping units can be adjusted according to actual conditions, and besides three groups of clamping units are adopted in the embodiment, four groups, five groups or six groups of clamping units can be arranged, and the multiple groups of clamping units have the same structure and are uniformly distributed along the circumferential direction; in principle, the number of the clamping units is at least three and at most six;
meanwhile, the number of the connecting lug frames on the outer side of the circumference of the moment arm connecting sleeve 204 is matched with the number of the clamping units, so that the clamping units are in one-to-one correspondence with the connecting lug frames on the outer side of the circumference of the moment arm connecting sleeve 204;
in the encircling type clamping assembly 3, when the moment arm connecting sleeve 204 slides axially, the moment arm connecting sleeve 204 of each clamping unit drives the driving arm 303 to pitch and swing along the axial direction of the second connecting rivet 304 through the third connecting rivet 305, so as to drive the rough surface attaching clamp 301 on the upper part of the driving arm 303 to move towards the direction close to or away from the live center 201, and the three rough surface attaching clamps 301 uniformly distributed along the circumferential direction synchronously move to realize inward clasping or outward unclamping.
By combining the structure, the working principle and the working process of the centre encircling clamping type driving clamp are explained as follows:
firstly, when processing a shaft workpiece, an operator matches a base main shaft matching conical surface 102 at the bottom of a base main body 101 with a main shaft outer conical surface of a grinding machine tool, and screws the clamp main body 101 and the machine tool main shaft through a flange for fixed connection through six bolts, and at the moment, a clamp base 1 is tightly installed on the machine tool main shaft;
then, starting the grinding machine tool, wherein an operator holds the shaft-type workpiece with one hand to enable the center hole at one end of the workpiece to be firstly contacted with the tip conical surface 2011 of the live center 201 in the sliding positioning live center assembly 2, and drives the tailstock tip of the machine tool to feed with the other hand to enable the center hole at the other end of the shaft-type workpiece to be contacted with the tailstock tip of the machine tool;
then, the tailstock centre of the machine tool is fed continuously, the tailstock centre of the machine tool drives the shaft-type workpiece and the live centre 201 to move axially, the live centre 201 overcomes the spring elasticity generated by the compression of the supporting spring 202 and moves axially in the center hole 104 of the base centre of the base main body 101, the live centre 201 pushes and drives the sliding sleeve 203 and the synchronous belt power arm connecting sleeve 201 to move axially, and the driving force arms 303 of the three groups of clamping units swing inwards under the sliding drive of the force arm connecting sleeve 201;
finally, under the driving of the driving force arm 303, the rough surface attaching chucks 301 of the three groups of clamping units clamp the shaft workpiece in the middle in an encircling manner, and the limiting nuts 205 at the tail parts of the live center 201 are screwed, so that the axial fixation of the live center 201 is realized, at the moment, the rough surface attaching chucks 301 and the driving force arm 303 are both in clamping positions, and the shaft part is driven and processed;
after the workpiece is machined, an operator loosens a tailstock center of the machine tool, pushes the driving sliding sleeve 203 to drive the power arm connecting sleeve 204 to reversely slide along the axial direction under the action of the elastic restoring force of the supporting spring 202, drives the power arms 303 of the three groups of clamping units synchronously swing outwards, and releases the corresponding rough surface attaching chuck 301 outwards, so that the workpiece is released, and at the moment, the rough surface attaching chuck 301 is in a releasing position, so that the workpiece can be detached, and a machining cycle is completed.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The utility model provides a top encircles clamp type drive anchor clamps which characterized in that:
the clamp consists of a clamp base (1), a sliding positioning live center assembly (2) and an encircling clamping assembly (3);
in the sliding positioning live center assembly (2), a live center (201) penetrates through the center of a clamp base (1), a sliding connection assembly and a support spring (202) are sequentially sleeved on a live center rod (2012), and the bottom of the support spring (202) is installed on the clamp base (1);
in the encircling type clamping assembly (3), a plurality of groups of clamping units are uniformly distributed and fixed on the clamp base (1) on the outer side of the circumference of the live center (201);
in the clamping unit, a rough surface attaching chuck (301) is hinged with one end of a driving force arm (303), the middle part of the driving force arm (303) is hinged on a force arm support frame (306), the other end of the driving force arm (303) is hinged on the sliding connection assembly, and the force arm support frame (306) is fixed on a clamp base (1);
the live center (201) drives the sliding connection assembly to extrude the supporting spring (202) to move axially under the action of axial external force, and drives the driving force arm (303) to swing inwards through the sliding connection assembly, so that the thick-face attaching clamp (301) clamps the live center (201) in an encircling manner.
2. The point embracing clamp type driving clamp of claim 1, wherein:
the sliding connection assembly consists of a driving sliding sleeve (203) and a force arm connection sleeve (204);
the driving sliding sleeve (203) is sleeved on the top point rod (2012), the limiting outer edge of one end of the driving sliding sleeve (203) abuts against the end surface of the bottom of the top point conical surface (2011), and the limiting outer edge of the other end of the driving sliding sleeve (203) abuts against the top of the supporting spring (202);
the force arm connecting sleeve (204) is arranged on the outer side of the driving sliding sleeve (203) and is limited between the limiting outer edges of the two ends of the driving sliding sleeve (203) along the axial direction;
and connecting lug frames which are correspondingly hinged with the driving force arms (303) one by one are distributed on the outer side of the circumference of the force arm connecting sleeve (204).
3. The point embracing clamp type driving clamp of claim 1, wherein:
the taper range of the tip conical surface (2011) of the live center (201) is as follows: 30 to 120.
4. The point embracing clamp type driving clamp of claim 1, wherein:
the sliding positioning live center assembly (2) further comprises: a limit nut (205);
the tail of the centre rod (2012) is provided with a centre rod thread section (2013) with an external thread, and the limiting nut (205) is connected with the centre rod thread section (2013) in a matched mode, so that when the live centre (201) has a reverse movement trend under the action of the spring elasticity of the supporting spring (202), the live centre (201) is axially limited on the bottom of the clamp base (1) through the limiting nut (205).
5. The point embracing clamp type driving clamp of claim 1, wherein:
the clamping units are three to six groups.
6. An apex embracing gripping drive clamp according to claim 1 or 5, wherein:
in the clamping unit, a rough surface attaching chuck (301) is hinged to a driving force arm (303) through a first connecting rivet (302), the driving force arm (303) is hinged to a force arm support frame (306) through a second connecting rivet (304), and the driving force arm (303) is hinged to a sliding connection assembly through a third connecting rivet (305).
7. The point embracing clamp type driving clamp of claim 1, wherein:
the driving force arm (303) adopts an L-shaped or C-shaped structure with an inward opening.
8. The point embracing clamp type driving clamp of claim 1, wherein:
the shape of the binding surface of the rough surface binding chuck (301) is matched with the shape of the surface of the outer circumference of the clamping end of the shaft part.
9. The point embracing clamp type driving clamp of claim 8, wherein:
the binding surface of the rough surface binding chuck (301) is a plane, a cylindrical smooth cambered surface or a cylindrical internal spline cambered surface.
10. The point embracing clamp type driving clamp of claim 1, wherein:
the base main body (101) of the clamp base (1) is of a two-stage step platform structure;
the bottom of the base main body (101) is provided with a base main shaft matching conical surface matched with the outer contour shape of a machine tool main shaft;
base flange connecting holes fixedly connected with a machine tool spindle are uniformly formed in the circumferential direction of the bottom step of the base main body (101);
the center of the base main body (101) is provided with a base center hole (104) through which the live center (201) passes;
and a base spring installation groove (105) for installing a supporting spring (202) is formed in the center of the top surface of the top step of the base main body (101).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111150816.9A CN113752162A (en) | 2021-09-29 | 2021-09-29 | Centre surrounding clamping type driving clamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111150816.9A CN113752162A (en) | 2021-09-29 | 2021-09-29 | Centre surrounding clamping type driving clamp |
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| CN113752162A true CN113752162A (en) | 2021-12-07 |
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| CN202111150816.9A Pending CN113752162A (en) | 2021-09-29 | 2021-09-29 | Centre surrounding clamping type driving clamp |
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| CN (1) | CN113752162A (en) |
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| CN115139243A (en) * | 2022-07-15 | 2022-10-04 | 南京信息工程大学 | Universal sphere self-centering clamp and clamping method thereof |
| CN115366138A (en) * | 2022-09-16 | 2022-11-22 | 江苏财经职业技术学院 | Automatic electric clamping robot who changes |
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Application publication date: 20211207 |