CN114211325B - Indexable eccentric turning and grinding clamp and application method thereof - Google Patents
Indexable eccentric turning and grinding clamp and application method thereof Download PDFInfo
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- CN114211325B CN114211325B CN202111308474.9A CN202111308474A CN114211325B CN 114211325 B CN114211325 B CN 114211325B CN 202111308474 A CN202111308474 A CN 202111308474A CN 114211325 B CN114211325 B CN 114211325B
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- eccentric
- machined
- hole
- movable inner
- inner ring
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000003754 machining Methods 0.000 claims description 21
- 230000013011 mating Effects 0.000 claims 1
- 230000008602 contraction Effects 0.000 description 6
- 238000009434 installation Methods 0.000 description 4
- 230000000149 penetrating effect Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 241000252254 Catostomidae Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 210000000078 claw Anatomy 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
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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
- B24B5/36—Single-purpose machines or devices
- B24B5/48—Single-purpose machines or devices for grinding walls of very fine holes, e.g. in drawing-dies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B35/00—Methods for boring or drilling, or for working essentially requiring the use of boring or drilling machines; Use of auxiliary equipment in connection with such methods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
-
- 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
- B23Q16/00—Equipment for precise positioning of tool or work into particular locations not otherwise provided for
- B23Q16/02—Indexing equipment
- B23Q16/04—Indexing equipment having intermediate members, e.g. pawls, for locking the relatively movable parts in the indexed position
- B23Q16/06—Rotary indexing
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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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- 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
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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
Abstract
The invention relates to an indexable eccentric turning and grinding clamp which comprises a clamp body, a fixed outer ring, a movable inner ring, an indexing pin, a plurality of nuts and a plurality of first screws, wherein the fixed outer ring is fixed on the fixed outer ring; the fixed outer ring is fixedly connected to the clamp body, an eccentric through hole is formed in the fixed outer ring, and an indexing pin mounting through hole is formed in the fixed outer ring; the movable inner ring is matched with the eccentric through hole, a plurality of indexing holes are formed in the outer circular surface of the movable inner ring, and the movable inner ring encloses a mounting groove for mounting a part to be processed; the front side surface of the clamp body is provided with a T-shaped ring groove, a plurality of nuts are embedded in the wide groove of the T-shaped ring groove in a manner of sliding along the T-shaped ring groove, and a plurality of first screws penetrate through the movable inner ring from front to back and are respectively connected with the nuts. The invention also provides a use method of the indexable eccentric turning and grinding clamp, which adopts the indexable eccentric turning and grinding clamp; the invention can be used for turning and grinding, and has the advantages of high processing precision, convenient operation, convenient adjustment and capability of realizing free indexing.
Description
Technical Field
The invention relates to processing of a revolving body, in particular to an indexable eccentric turning and grinding clamp and a using method thereof.
Background
For the abrasive machining of the eccentric inner hole of a precision part, the mode of adjusting the center of a hole to be machined of the part to the center of a machine tool spindle is generally adopted, more magnetic force suckers are used for tensioning the part clamping mode, a chuck of the machine tool spindle is clamped, and the like, so that the hole to be machined is often required to be aligned during machining, and the abrasive machining tool is complex in operation and low in efficiency. For the machining of such parts, conventional clamping schemes generally suffer from two drawbacks: firstly, the specificity of the clamp is too strong, the traditional clamp is generally specially designed aiming at parts, one part even one processing part corresponds to one set of clamp, and the processing cost is certainly increased; secondly, the operation is tedious during processing, the part to be processed needs to be aligned, even the part or the clamp needs to be knocked, and the processing efficiency is low.
Disclosure of Invention
The invention aims to provide an indexable eccentric turning and grinding clamp and a use method thereof, so as to reduce or eliminate at least one technical problem.
The invention relates to an indexable eccentric turning and grinding clamp which comprises a clamp body, a fixed outer ring, a movable inner ring, an indexing pin, a plurality of nuts and a plurality of first screws, wherein the fixed outer ring is fixedly arranged on the fixed outer ring;
the fixture body is used for being connected with a machine tool, and the central axis of the fixture body is a first central axis extending along the front-back direction;
the fixed outer ring is fixedly connected to the front side of the clamp body, an eccentric through hole is formed in the fixed outer ring, the central axis of the eccentric through hole is a second central axis extending along the front-back direction, the second central axis is eccentrically arranged relative to the first central axis, an indexing pin mounting through hole is formed in the fixed outer ring, the central axis of the indexing pin mounting through hole is perpendicular to and intersects with the second central axis, and the indexing pin is mounted in the indexing pin mounting through hole;
the movable inner ring is matched with the eccentric through hole in a rotatable mode, a plurality of indexing holes used for being matched with the indexing pins are formed in the outer circular surface of the movable inner ring, the plurality of indexing holes are arranged at intervals in the circumferential direction of the movable inner ring, the movable inner ring encloses a mounting groove used for mounting a part to be machined, the central axis of the mounting groove is collinear with the second central axis, and the distance between the groove wall of the mounting groove and the second central axis is larger than the distance between the second central axis and the first central axis;
the front side of the clamp body is provided with a T-shaped ring groove, a central axis surrounded by the T-shaped ring groove is collinear with the second central axis, a plurality of nuts are embedded in a wide groove of the T-shaped ring groove in a sliding mode along the T-shaped ring groove, a plurality of first screws penetrate through the movable inner ring from front to back and are respectively connected with the nuts, and the movable inner ring can be fastened and connected to the front side of the clamp body by tightening the first screws.
As an improvement, a first bushing is installed in the index pin installation through hole, the index pin is matched with the first bushing, and a second bushing for being matched with the index pin is installed in each of the plurality of index holes.
As a modification, a plurality of the index holes are arranged at equal intervals in the circumferential direction of the movable inner ring.
As an improvement, the fixture body comprises a connecting disc and a connecting shaft coaxially connected to the rear side of the connecting disc, and a central hole penetrating through the fixture body along the front-rear direction is formed in the fixture body.
As an improvement, a first expansion groove extending backwards from the front end face of the movable inner ring is formed in the movable inner ring, and a spring used for expanding the first expansion groove and a second screw used for driving the first expansion groove to shrink are arranged in the movable inner ring.
As an improvement, the first expansion groove penetrates through the side wall of the movable inner ring along the radial direction of the movable inner ring.
As an improvement, a jacket for clamping the part to be processed is embedded in the mounting groove.
As an improvement, the device further comprises a positioning plate, at least two first positioning pins extending backwards and one second positioning pin extending backwards are fixedly connected to the positioning plate, at least two first positioning holes which are respectively used for being matched with the at least two first positioning pins are formed in the movable inner ring, when the at least two first positioning pins are respectively matched with the at least two first positioning holes, the central axis of the second positioning pins is collinear with the first central axis, and the second positioning pins are used for being matched with eccentric holes to be machined on parts to be machined.
The invention also provides a use method of the indexable eccentric turning and grinding clamp, which adopts the indexable eccentric turning and grinding clamp and comprises the following steps:
s1, mounting an assembled indexable eccentric turning and grinding clamp on a lathe spindle;
s2, unscrewing a second screw, mounting the part to be processed into the jacket, and then screwing the second screw;
s3, machining an eccentric hole to be machined;
s4, if the eccentric holes to be machined are still needed to be machined, after one eccentric hole to be machined is machined, loosening the plurality of first screws, loosening the indexing pin, rotating the movable inner ring by a certain angle to the next machining position according to the requirement, then screwing the indexing pin to be matched with the corresponding indexing hole, tightening the plurality of first screws, and machining the other eccentric hole to be machined;
and S5, if the eccentric holes to be machined are still needed to be machined, repeating the step S4 until machining of a plurality of eccentric holes to be machined on the part to be machined is completed.
The invention also provides a use method of the indexable eccentric turning and grinding clamp, which adopts the indexable eccentric turning and grinding clamp and comprises the following steps:
s1, mounting an assembled indexable eccentric turning and grinding clamp on a grinding machine spindle;
s2, unscrewing a second screw, and mounting the part to be processed into the jacket;
s3, connecting the locating plate to the movable inner ring, enabling the second locating pin to be matched with one eccentric hole to be machined so as to locate the eccentric hole to be machined, then screwing the second screw, and taking down the locating plate;
s4, grinding the eccentric hole to be machined;
s5, if the eccentric holes to be machined need to be ground, after finishing grinding one eccentric hole to be machined, unscrewing a plurality of first screws, unscrewing an indexing pin, rotating the movable inner ring by a certain angle to the next machining position according to the requirement, screwing the indexing pin to be matched with the corresponding indexing hole, screwing the plurality of first screws, and grinding the other eccentric hole to be machined;
and S6, if the eccentric holes to be machined are required to be ground, repeating the step S5 until the grinding of the plurality of the eccentric holes to be machined on the part to be machined is completed.
The invention can be used for turning and grinding, and has the advantages of high processing precision, convenient operation, convenient adjustment and capability of realizing free indexing.
Drawings
FIG. 1 is a schematic illustration of an indexable eccentric turning clamp in accordance with an embodiment;
FIG. 2 is a cross-sectional view of an indexable eccentric turning wear fixture in accordance with an embodiment;
fig. 3 is a schematic structural view of a part to be machined.
In the figure: 1-a clamp body; 2-fixing the outer ring; 3-a movable inner ring; 4-a jacket; 5-a connecting shaft; 6-a central hole; 7-a second positioning hole; 8-a third screw; 9-a connecting pin; 10-indexing pins; 11-indexing holes; 12-a first bushing; 13-a second bushing; 14-T-shaped ring grooves; 15—a first screw; 16-a nut; 17-a first expansion tank; 18-a second screw; 19-a spring; 20-positioning plate; 21-a first locating pin; 22-a second locating pin; 23-a first positioning hole; 24-a part to be processed; 25-eccentric holes to be processed; 26-a first central axis; 27-a second central axis; 28-a second expansion tank.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Example 1
An indexable eccentric turning and grinding clamp as shown in fig. 1 and 2 comprises a clamp body 1, a fixed outer ring 2, a movable inner ring 3, an indexing pin 10, a plurality of nuts 16 and a plurality of first screws 15;
the fixture body 1 is used for being connected with a machine tool, and the central axis of the fixture body 1 is a first central axis 26 extending along the front-back direction;
the fixed outer ring 2 is fixedly connected to the front side of the fixture body 1, an eccentric through hole is arranged on the fixed outer ring 2, the central axis of the eccentric through hole is a second central axis 27 extending along the front-back direction, the second central axis 27 is eccentrically arranged relative to the first central axis 26, an indexing pin installation through hole is arranged on the fixed outer ring 2, the central axis of the indexing pin installation through hole is perpendicular to and intersected with the second central axis 27, the indexing pin 10 is installed in the indexing pin installation through hole, and preferably, in order to facilitate rotating the indexing pin 10, the outer end of the indexing pin 10 is connected with a handle with a diameter larger than that of the indexing pin 10;
the movable inner ring 3 is matched with the eccentric through hole in a rotatable mode, a plurality of indexing holes 11 for being matched with the indexing pins 10 are formed in the outer circular surface of the movable inner ring 3, the plurality of indexing holes 11 are arranged at intervals in the circumferential direction of the movable inner ring 3, the movable inner ring 3 encloses a mounting groove for mounting a part 24 to be processed, the notch of the mounting groove is arranged forwards, the central axis of the mounting groove is collinear with the second central axis 27, and the distance between the groove wall of the mounting groove and the second central axis 27 is larger than the distance between the second central axis 27 and the first central axis 26;
the front side surface of the clamp body 1 is provided with a T-shaped ring groove 14, the central axis surrounded by the T-shaped ring groove 14 is collinear with the second central axis 27, a plurality of nuts 16 are embedded in the wide groove of the T-shaped ring groove 14 in a manner of sliding along the T-shaped ring groove 14,
the movable inner ring 3 is provided with a plurality of first screw connecting holes penetrating through the movable inner ring 3 from front to back, a plurality of first screws 15 respectively penetrate through the first screw connecting holes from front to back and are respectively connected with a plurality of nuts 16, the movable inner ring 3 can be tightly connected to the front side of the clamp body 1 by screwing the plurality of first screws 15, the tight connection between the movable inner ring 3 and the clamp body 1 can be relieved by unscrewing the plurality of first screws 15, and the indexing pin 10 is unscrewed again so that the indexing pin 10 is separated from the indexing hole 11, then the movable inner ring 3 can be rotated, and the angle of the movable inner ring 3 can be adjusted.
In the present embodiment, the stationary outer ring 2 is fixedly coupled to the front side of the jig body 1 by a third screw 8 and a coupling pin 9.
In the present embodiment, the first bushing 12 is mounted in the index pin mounting through hole by an interference fit, the index pin 10 is slidably fitted with the first bushing 12, and the second bushing 13 for slidably fitting with the index pin 10 is mounted in each of the plurality of index holes 11 by an interference fit. By arranging the first bush 12 and the second bush 13, the matching precision of the indexing pin 10 and the indexing hole 11 can be improved, and the matching clearance between the indexing pin 10 and the two bushes can be less than or equal to 0.01mm, so that the arrangement of the first bush 12 and the second bush 13 is beneficial to realizing precise indexing.
In the present embodiment, the plurality of index holes 11 are arranged at equal intervals in the circumferential direction of the movable inner ring 3, so that the machining of the parts 24 to be machined in which the plurality of eccentric holes 25 to be machined are arranged at equal intervals is facilitated.
In this embodiment, the clamp body 1 includes a connection disc and a connection shaft 5 coaxially connected to the rear side of the connection disc, and a center hole 6 penetrating the clamp body 1 in the front-rear direction is provided in the clamp body 1. The indexable eccentric turning and grinding clamp can be turned and ground for two purposes, and the connecting shaft 5 can be directly clamped by a claw or a chuck joint during lathe processing, so that eccentric holes can be drilled and bored; when the eccentric hole is ground, the connecting shaft 5 of the clamp body 1 can be clamped by the precision chuck, or the central hole 6 of the clamp body 1 is directly connected with the flange plate of the grinding machine, so that high machining precision can be achieved without alignment. Preferably, in order to improve the connection accuracy with the machine tool, a second positioning hole 7 is provided on the rear side of the connection disc.
In this embodiment, a first expansion groove 17 extending backward from the front end surface of the movable inner ring 3 is provided on the movable inner ring 3, and a spring 19 for expanding the first expansion groove 17 and a second screw 18 for driving the first expansion groove 17 to contract are provided in the movable inner ring 3. In the concrete implementation, counter bores are formed in two sides of the first expansion and contraction groove 17, and the spring 19 is arranged between the two counter bores; the two sides of the first expansion and contraction groove 17 are respectively provided with a second screw connecting hole for being matched with the second screw 18, one second screw connecting hole is a threaded hole, the other second screw connecting hole is a step hole, the second screw 18 passes through the step hole and is matched with the threaded hole, and the second screw 18 is screwed down, so that the distance between the first expansion and contraction grooves 17 can be reduced, the first expansion and contraction groove 17 is contracted, and then the mounting groove is contracted; by unscrewing the second screw 18, the spring 19 can expand the first expansion groove 17, causing the first expansion groove 17 to expand, and thus the mounting groove to expand. Preferably, the first expansion groove 17 penetrates the side wall of the movable inner ring 3 along the radial direction of the movable inner ring 3. Preferably, the first expansion groove 17 penetrates the movable inner ring 3 along a diameter direction of the movable inner ring 3.
As an improvement, a second expansion groove 28 extending backwards from the front end face of the movable inner ring 3 is further arranged on the movable inner ring 3, the second expansion groove 28 and the first expansion groove 17 are arranged in parallel and at intervals, the first expansion groove 17 penetrates through the movable inner ring 3 along one diameter direction of the movable inner ring 3, the second expansion groove 28 is eccentrically arranged relative to the second central axis 27, the second expansion groove 28 and the first expansion groove 17 divide the front part of the movable inner ring 3 into a first base part, a movable part and a second base part, the movable part is positioned between the first base part and the second base part, when the movable inner ring 3 is driven to expand and contract by utilizing the second screw 18 and the spring 19, the movement of the first base part and the second base part is mainly reduced or even eliminated, that is, the matching precision of the eccentric through holes on the first base part and the second base part and the fixed outer ring 2 can be ensured, that is, by arranging the second expansion groove 28, the matching precision of the eccentric through holes on the movable inner ring 3 and the fixed outer ring 2 can be ensured.
In this embodiment, the mounting groove is fitted with a jacket 4 for holding the part 24 to be machined. The part 24 to be machined can be clamped by contracting the jacket 4, and the part 24 to be machined can be removed by expanding the jacket 4; during actual use, the jacket 4 can be driven to expand and contract by controlling the expansion and contraction of the first expansion and contraction groove 17.
In this embodiment, the positioning device further includes a positioning plate 20, at least two first positioning pins 21 extending backward and one second positioning pin 22 extending backward are fixedly connected to the positioning plate 20, at least two first positioning holes 23 respectively used for being matched with the at least two first positioning pins 21 are arranged on the movable inner ring 3, when the at least two first positioning pins 21 are respectively matched with the at least two first positioning holes 23, the central axis of the second positioning pin 22 is collinear with the first central axis 26, and the second positioning pin 22 is used for being matched with an eccentric hole to be machined on a part to be machined 24. The positioning plate 20 is provided to position the eccentric hole 25 to be machined in the part 24 to be machined before grinding.
The indexable eccentric turning and grinding clamp is mainly used for turning and precisely grinding a plurality of eccentric hole systems on the same indexing circle of a revolving body part with an eccentric hole structure, and has the machining length-diameter ratio of less than or equal to 8, the cylindricity of deep and small eccentric holes of which the thickness-diameter ratio is less than or equal to 8 can be within 0.005mm, and the indexable eccentric turning and grinding clamp is simple in structure, convenient to operate and capable of realizing free indexing.
The indexable eccentric turning and grinding clamp can realize turning and grinding of eccentric holes with different apertures on the same indexing circle by clamping the part 24 to be machined only once and rapidly adjusting the clamp.
The indexable eccentric turning and grinding clamp has wide application range, can be quickly changed into an eccentric turning and grinding clamp of another product by replacing the fixed outer ring 2 and the movable inner ring 3, and is very flexible to adjust;
the indexable eccentric turning and grinding clamp can realize precise indexing, a plurality of indexing holes 11 are designed, the first bush 12, the second bush 13 and the indexing pin are matched with the indexing holes 11, the matching clearance between the indexing pin 10 and the two bushes can be less than or equal to 0.01mm, meanwhile, the T-shaped annular groove 14, the first screw 15 and the nut 16 are arranged to further ensure the position precision of the movable inner ring 3, and the indexable eccentric turning and grinding clamp can realize precise indexing, so that the deep small eccentric hole cylindricity with the processing length-diameter ratio less than or equal to 8 can be within 0.005 mm.
The indexable eccentric turning and grinding clamp is provided with the jacket 4, the first expansion groove 17 and the second screw 18 to be matched, and the part 24 to be processed can be pressed and loosened by tightening the second screw 18 every time, so that alignment is not needed, and the clamping and grinding clamp is rapid and convenient.
The indexable eccentric turning and grinding clamp is convenient and firm to connect, and is convenient to maintain and replace damaged parts. Parts such as the fixed outer ring 2, the movable inner ring 3, the first positioning pin 21, the second positioning pin 22, the first bushing 12, the second bushing 13 and the like related in the clamp can be recovered to use through replacement, clamping and adjustment again when damaged.
Example two
The method for using the indexable eccentric turning and grinding fixture in the first embodiment, in which the part 24 to be machined is structured as shown in fig. 3, and a plurality of eccentric holes on the same indexing circle are designed on the part 24 to be machined, the method for using the indexable eccentric turning and grinding fixture includes the following steps:
s1, mounting an assembled indexable eccentric turning and grinding clamp on a lathe spindle;
s2, unscrewing the second screw 18, installing the part 24 to be machined into the jacket 4, and then screwing the second screw 18;
s3, machining an eccentric hole 25 to be machined;
s4, if the eccentric holes 25 to be machined are still needed to be machined, after one eccentric hole 25 to be machined is machined, loosening the plurality of first screws 15, loosening the index pin 10, rotating the movable inner ring 3 by a certain angle to the next machining position according to the requirement, then screwing the index pin 10 to be matched with the corresponding index hole 11, and tightening the plurality of first screws 15 to machine the other eccentric hole 25 to be machined;
and S5, if the eccentric holes 25 to be machined are still required to be machined, repeating the step S4 until machining of the plurality of eccentric holes 25 to be machined on the part 24 to be machined is completed.
Example III
The method for using the indexable eccentric turning and grinding clamp in the first embodiment, wherein the structure of the part 24 to be machined is shown in fig. 3, and the part 24 to be machined is provided with a plurality of eccentric holes on the same indexing circle, the method for using the indexable eccentric turning and grinding clamp comprises the following steps:
s1, mounting an assembled indexable eccentric turning and grinding clamp on a grinding machine spindle;
s2, unscrewing the second screw 18, and installing the part 24 to be machined into the jacket 4;
s3, connecting the positioning plate 20 to the movable inner ring 3, enabling the second positioning pin 22 to be matched with one eccentric hole 25 to be processed so as to position the eccentric hole 25 to be processed, then screwing the second screw 18, and taking down the positioning plate 20;
s4, grinding the eccentric hole 25 to be machined;
s5, if the eccentric holes 25 to be machined are required to be ground, after one eccentric hole 25 to be machined is ground, loosening the plurality of first screws 15, loosening the index pin 10, rotating the movable inner ring 3 by a certain angle to the next machining position according to the requirement, screwing the index pin 10 to be matched with the corresponding index hole 11, tightening the plurality of first screws 15, and grinding the other eccentric hole 25 to be machined;
and S6, if the eccentric holes 25 to be machined are still required to be ground, repeating the step S5 until the grinding of the plurality of eccentric holes 25 to be machined on the part 24 to be machined is completed.
That is, the indexable eccentric turning and grinding fixture provided by the invention can be used for drilling and boring eccentric holes and grinding the eccentric holes, and can also realize the drilling and boring eccentric holes and grinding of the eccentric holes with different apertures on the same indexing circle.
Claims (9)
1. The indexable eccentric turning and grinding clamp is characterized by comprising a clamp body, a fixed outer ring, a movable inner ring, an indexing pin, a plurality of nuts and a plurality of first screws;
the fixture body is used for being connected with a machine tool, and the central axis of the fixture body is a first central axis extending along the front-back direction;
the fixed outer ring is fixedly connected to the front side of the clamp body, an eccentric through hole is formed in the fixed outer ring, the central axis of the eccentric through hole is a second central axis extending along the front-back direction, the second central axis is eccentrically arranged relative to the first central axis, an indexing pin mounting through hole is formed in the fixed outer ring, the central axis of the indexing pin mounting through hole is perpendicular to and intersects with the second central axis, and the indexing pin is mounted in the indexing pin mounting through hole;
the movable inner ring is matched with the eccentric through hole in a rotatable mode, a plurality of indexing holes used for being matched with the indexing pins are formed in the outer circular surface of the movable inner ring, the plurality of indexing holes are arranged at intervals in the circumferential direction of the movable inner ring, the movable inner ring encloses a mounting groove used for mounting a part to be machined, the central axis of the mounting groove is collinear with the second central axis, and the distance between the groove wall of the mounting groove and the second central axis is larger than the distance between the second central axis and the first central axis;
the front side surface of the clamp body is provided with a T-shaped ring groove, a central axis surrounded by the T-shaped ring groove is collinear with the second central axis, a plurality of nuts are embedded in a wide groove of the T-shaped ring groove in a sliding manner along the T-shaped ring groove, a plurality of first screws penetrate through the movable inner ring from front to back and are respectively connected with the plurality of nuts, and the movable inner ring can be fastened and connected to the front side of the clamp body by tightening the plurality of first screws;
the movable inner ring is provided with a first expansion groove extending backwards from the front end face of the movable inner ring, and the movable inner ring is internally provided with a spring for expanding the first expansion groove and a second screw for driving the first expansion groove to shrink.
2. The indexable eccentric turning clamp of claim 1 wherein a first bushing is mounted in the index pin mounting throughbore, the index pin mates with the first bushing, and a second bushing is mounted in each of the plurality of index holes for mating with the index pin.
3. The indexable eccentric turning clamp of claim 1 wherein a plurality of the indexing holes are equally spaced circumferentially about the movable inner race.
4. The indexable eccentric turning clamp of claim 1 wherein the clamp body comprises a connecting disc and a connecting shaft coaxially connected to the rear side of the connecting disc, the clamp body being provided with a central hole extending through the clamp body in a fore-aft direction.
5. The indexable eccentric turning clamp of claim 1 wherein the first expansion groove extends radially through a sidewall of the movable inner ring.
6. The indexable eccentric turning clamp of claim 1 wherein the mounting groove has a collet embedded therein for gripping a part to be machined.
7. The indexable eccentric turning and grinding clamp according to claim 6, further comprising a positioning plate, wherein at least two first positioning pins extending backwards and one second positioning pin extending backwards are fixedly connected to the positioning plate, at least two first positioning holes respectively used for being matched with the at least two first positioning pins are formed in the movable inner ring, and when the at least two first positioning pins are respectively matched with the at least two first positioning holes, the central axis of the second positioning pin is collinear with the first central axis, and the second positioning pin is used for being matched with an eccentric hole to be machined in a part to be machined.
8. A method of using the indexable eccentric turning clamp of claim 6 or claim 7, comprising the steps of:
s1, mounting an assembled indexable eccentric turning and grinding clamp on a lathe spindle;
s2, unscrewing a second screw, mounting the part to be processed into the jacket, and then screwing the second screw;
s3, machining an eccentric hole to be machined;
s4, if the eccentric holes to be machined are still needed to be machined, after one eccentric hole to be machined is machined, loosening the plurality of first screws, loosening the indexing pin, rotating the movable inner ring by a certain angle to the next machining position according to the requirement, then screwing the indexing pin to be matched with the corresponding indexing hole, tightening the plurality of first screws, and machining the other eccentric hole to be machined;
and S5, if the eccentric holes to be machined are still needed to be machined, repeating the step S4 until machining of a plurality of eccentric holes to be machined on the part to be machined is completed.
9. A method of using the indexable eccentric turning clamp of claim 7, comprising the steps of:
s1, mounting an assembled indexable eccentric turning and grinding clamp on a grinding machine spindle;
s2, unscrewing a second screw, and mounting the part to be processed into the jacket;
s3, connecting the locating plate to the movable inner ring, enabling the second locating pin to be matched with one eccentric hole to be machined so as to locate the eccentric hole to be machined, then screwing the second screw, and taking down the locating plate;
s4, grinding the eccentric hole to be machined;
s5, if the eccentric holes to be machined need to be ground, after finishing grinding one eccentric hole to be machined, unscrewing a plurality of first screws, unscrewing an indexing pin, rotating the movable inner ring by a certain angle to the next machining position according to the requirement, screwing the indexing pin to be matched with the corresponding indexing hole, screwing the plurality of first screws, and grinding the other eccentric hole to be machined;
and S6, if the eccentric holes to be machined are required to be ground, repeating the step S5 until the grinding of the plurality of the eccentric holes to be machined on the part to be machined is completed.
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| CN202111308474.9A CN114211325B (en) | 2021-11-05 | 2021-11-05 | Indexable eccentric turning and grinding clamp and application method thereof |
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| CN202111308474.9A CN114211325B (en) | 2021-11-05 | 2021-11-05 | Indexable eccentric turning and grinding clamp and application method thereof |
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| CN114211325A (en) | 2022-03-22 |
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