CN112846296B - Center distance variable positioning device and connecting rod fine boring clamp using same - Google Patents
Center distance variable positioning device and connecting rod fine boring clamp using same Download PDFInfo
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- CN112846296B CN112846296B CN202110009677.1A CN202110009677A CN112846296B CN 112846296 B CN112846296 B CN 112846296B CN 202110009677 A CN202110009677 A CN 202110009677A CN 112846296 B CN112846296 B CN 112846296B
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- 230000007246 mechanism Effects 0.000 claims abstract description 82
- 238000003825 pressing Methods 0.000 claims description 43
- 230000013011 mating Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 238000001514 detection method Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 238000003754 machining Methods 0.000 abstract description 13
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
- B23Q3/00—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine
- B23Q3/02—Devices holding, supporting, or positioning work or tools, of a kind normally removable from the machine for mounting on a work-table, tool-slide, or analogous part
- B23Q3/06—Work-clamping means
- B23Q3/08—Work-clamping means other than mechanically-actuated
- B23Q3/082—Work-clamping means other than mechanically-actuated hydraulically actuated
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Jigs For Machine Tools (AREA)
Abstract
The invention discloses a variable center distance positioning device and a connecting rod fine boring fixture using the same, wherein a workpiece is at least supported and positioned by two centering mechanisms, and in at least one centering mechanism: the matching piece can rotate at an angle relative to the supporting piece, and the matching piece is eccentrically arranged relative to the rotation center of the supporting piece and the circle centers of the supporting surfaces of the middle dividing pieces, so that the center distance between the two middle dividing mechanisms is changed. The invention provides a variable center distance positioning device, wherein a centering piece is driven by a first driving piece and a supporting piece to center and position a connecting rod hole, so that the hole coincides with the center of a centering mechanism, and the center of the centering mechanism is corresponding to the center of a boring cutter before machining, so that the centering mechanism does not need to be re-aligned when machining each time, and the centering mechanism is required to clamp the center distance, the matching piece is rotated, thereby realizing the clamping of connecting rods with different center distances by a set of positioning device.
Description
Technical Field
The invention relates to the technical field of machining, in particular to a variable center distance positioning device.
Background
The connecting rod is used as an important connecting mechanism of an automobile engine, is connected with a shell piston and a crankshaft, and transmits the stress of the piston to the crankshaft so as to drive the crankshaft to rotate at a high speed, so that the connecting rod is required to be manufactured with high precision, the radial precision of a large hole and a small hole of the connecting rod, the central office precision between the large hole and the small hole and the perpendicularity of the large hole, the small hole and the end face are generally required to be ensured, the two side faces are subjected to fine grinding after rough machining, the parallelism is ensured, and then boring is performed on a boring machine, so that the radial precision of the large hole and the small hole, the central office precision between the large hole and the small hole and the perpendicularity of the large hole, the small hole and the end face all meet the machining precision requirement.
And if a plurality of machine tools cannot be provided, the clamp needs to be replaced every time, the clamp replacement is troublesome and time-consuming, and batch processing is not facilitated.
Therefore, there is a need for a positioning device that can position links with different center distances.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a variable center distance positioning device which is used for solving the problem that a clamp is only suitable for clamping a center distance connecting rod in the prior art.
In order to achieve the technical purpose, the technical scheme of the invention is as follows: a variable center distance positioning device is used for positioning a workpiece and comprises a supporting part and a centering mechanism fixedly connected with the supporting part, wherein: the centering mechanism comprises a first driving piece, a matching piece, a propping piece and a centering piece, wherein the matching piece is provided with a first sliding hole and a plurality of second sliding holes which are circumferentially arranged along the first sliding hole, one end of the propping piece is provided with a first matching part corresponding to the second sliding holes, the propping piece is in sliding connection with the first sliding holes, the centering piece is respectively in sliding connection with the second sliding holes, one end of the centering piece is provided with a second matching part, the other end of the centering piece is provided with a propping part, the first matching part is in sliding connection with the second matching part, and the second matching part is arranged at an included angle with the sliding direction of the propping piece relative to the matching piece relative to the sliding direction of the first matching part, so that the propping piece drives the centering pieces to slide along the corresponding second sliding holes respectively, and in the sliding process, the propping parts are always positioned on a round propping surface with the same circle center, and the first driving piece is arranged between the propping piece and the propping piece so as to drive the propping piece to slide, thereby enabling the propping pieces to prop against a peripheral surface of a workpiece; the workpiece is held and positioned by at least the two-part mechanism, and in at least one of the two-part mechanisms: the matching piece can rotate at an angle relative to the supporting piece, and the matching piece is eccentrically arranged relative to the rotation center of the supporting piece and the circle centers of the supporting surfaces of the plurality of middle-split pieces, so that the center distance of the supporting between the two middle-split mechanisms is changed.
Preferably, the number of the centering mechanisms for positioning the workpiece is two, wherein the matching piece of one centering mechanism is fixedly connected with the supporting piece, and the matching piece of the other centering mechanism can rotate relatively with the supporting piece and is fixedly connected with the supporting piece.
Preferably, the number of the middle parts of one middle mechanism is two, and the number of the middle parts of the other middle mechanism is three.
The invention also provides a connecting rod fine boring fixture for positioning and clamping a workpiece, which comprises the variable center distance positioning device, a fixing piece, a clamping piece, an anti-falling mechanism and a second driving piece, wherein: the second driving piece is used for driving the variable center distance positioning device to slide relative to the fixing piece and enabling the centering mechanism to axially separate from the jacking peripheral surface of the centering piece to be centered of the workpiece and to be propped against the workpiece; the clamping piece is fixedly connected with the fixing piece and presses the workpiece against the fixing piece so as to fix the workpiece; the anti-disengaging mechanism comprises a guide piece, a pressing piece and a third driving piece, wherein the guide piece is fixedly connected with the fixing piece, a third sliding hole and a matching groove which is arranged on the periphery side of the third sliding hole are formed in the guide piece, one end of the pressing piece is in butt joint with the supporting piece, the other end of the pressing piece is pressed against the workpiece, a matching table is formed on the side face of the pressing piece and slides along the matching groove, the third driving piece is connected with the pressing piece and is used for driving the pressing piece to move along the clamping direction of the clamping piece, and the matching groove is at least partially obliquely arranged, so that the pressing piece and the guide piece relatively slide and simultaneously relatively rotate; and the second driving piece slides along the matching groove under the action of the third driving piece in the process that the second driving piece axially breaks away from the propped peripheral surface of the split middle piece of the workpiece and is propped against the side surface of the workpiece, so that the propping piece rotates and is propped against the side surface of the workpiece.
Preferably, the fixing piece comprises a fixing plate and a positioning block, one side of the positioning block is fixedly connected with the fixing plate, the other opposite side is provided with an air detection hole, and the workpiece is arranged on the air detection hole.
Preferably, the anti-falling mechanism further comprises an anti-falling rod fixedly connected with the fixing piece and used for preventing the workpiece from falling to two sides after being separated from the pressing piece and pressed.
Preferably, the clamping piece comprises a fourth driving piece and a pressing block, one end of the fourth driving piece is fixedly connected with the fixing piece, and the other end of the fourth driving piece is fixedly connected with the pressing block.
Preferably, the fourth driving member is a corner hydraulic cylinder.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a variable center distance positioning device, wherein a centering piece is driven by a first driving piece and a supporting piece to center and position a connecting rod hole, so that the hole coincides with the center of a centering mechanism, and the center of the centering mechanism is corresponding to the center of a boring cutter before machining, so that the centering mechanism does not need to be re-aligned when machining each time, and the centering mechanism is required to clamp the center distance, the matching piece is rotated, thereby realizing the clamping of connecting rods with different center distances by a set of positioning device.
Drawings
FIG. 1 is a top view of a variable center distance positioning device provided by the invention;
FIG. 2 is a front view of the variable center distance positioning device provided by the invention;
FIG. 3 is a front view and a side view of a centering member of the variable center distance positioning device provided by the invention;
FIG. 4 is a top view and a front view of two abutments of the variable center distance positioning device provided by the present invention;
FIG. 5 is a cross-sectional view and a top view of an eccentric fitting of the variable center distance positioning device provided by the invention;
FIG. 6 is a cross-sectional view and a top view of two different angles of a non-eccentric mating member of a variable center distance positioning device provided by the invention;
FIG. 7 is a front view of the connecting rod fine boring grab provided by the invention;
FIG. 8 is a partial top view of the connecting rod fine boring grab provided by the invention in a clamped state and an undamped state, respectively;
FIG. 9 is a partial front view of the connecting rod fine boring grab provided by the present invention with the clamp open (with the fixing plate hidden);
FIG. 10 is a partial front view of the connecting rod fine boring grab of the present invention with the clamping members compressed (with the fixing plate hidden);
FIG. 11 is a partial cross-sectional view of the anti-slip mechanism of the connecting rod fine boring grab provided by the invention;
FIG. 12 is a top view, a cross-sectional view and a front view of a guide of the connecting rod fine boring grab provided by the present invention;
FIG. 13 is a cross-sectional view and an elevation view of a positioning block of the connecting rod fine boring jig provided by the invention;
Reference numerals: 1-lifting piece, 2-centering mechanism, 3-fixing piece, 4-clamping piece, 5-anti-falling mechanism, 6-second driving piece, 7-driving connecting block, 11-supporting plate, 12-centering connecting shaft, 21-first driving piece, 22-matching piece, 23-abutting piece, 24-centering piece, 25-pressing plate, 31-fixing plate, 32-guiding sleeve, 33-positioning block, 41-fourth driving piece, 42-abutting block, 51-guiding piece, 52-abutting block, 53-third driving piece, 54-anti-falling rod, 55-blocking ring, 56-connecting piece, 121-decompression hole, 221-first sliding hole, 222-second sliding hole, 231-first matching part, 241-second matching part, 242-abutting part, 331-air checking hole, 511-third sliding hole, 512-matching groove and 521-matching table.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, the present embodiment provides a variable center distance positioning device for positioning a workpiece, which is characterized by comprising a supporting member 1 and a centering mechanism 2, wherein:
The centering mechanism 2 is fixedly connected with the supporting member 1, and the centering mechanism 2 comprises a first driving member 21, a matching member 22, a supporting member 23 and a centering member 24.
In this embodiment, the supporting member 1 includes a supporting plate 11 and a middle connecting shaft 12, one end of the middle connecting shaft 12 is fixedly connected with the supporting plate 11, and the other end is provided with a groove in sliding and rotating connection with the mating member 22 or a groove in threaded connection with the mating member 22.
The engaging member 22 is provided with a first sliding hole 221 and a plurality of second sliding holes 222 circumferentially arranged along the first sliding hole 221, one end of the abutting member 23 forms a first engaging portion 231 corresponding to the second sliding hole 222, the abutting member 23 is slidably connected with the first sliding hole 221, the plurality of middle members 24 are slidably connected with the plurality of second sliding holes 222 respectively, one end of the middle member 24 forms a second engaging portion 241, the other end forms a supporting portion 242, the first engaging portion 231 is slidably connected with the second engaging portion 241, the first engaging portion 231 and the second engaging portion 241 can generally adopt a boss and groove engagement, the cross-sectional shape of which is not limited, but the profile of which is matched, preferably, the first engaging portion 231 is a T-shaped groove, the second engaging portion 241 is a T-shaped boss, and the sliding direction of the second engaging portion 241 relative to the first engaging portion 231 and the sliding direction of the abutting member 23 relative to the engaging member 22 are arranged at an included angle, when the propping member 23 slides along the first sliding hole 221, the propping member 23 drives the plurality of middle parts 24 to slide along the corresponding second sliding holes 222, and in the sliding process, the plurality of propping portions 242 are always located on the circular propping surface with the same center, in this embodiment, in order to ensure that the propping portions 242 are always located on the circular propping surface with the same center in the sliding process, the central axis of the propping surface is the central axis of the propping member 23, and the second sliding holes 222 point to the central axis, and meanwhile, in the sliding process of the propping member 23 for a certain distance, the displacement of each middle part 24 connected with the propping member 23 is the same, therefore, the included angles between the first matching portion 231 and the second matching portion 241 and the central axis are the same, and the manufacturing difficulty can be greatly reduced. It is easy to understand that the central axis of the supporting surface is not necessarily the central axis of the supporting member 23, the second sliding hole 222 is not necessarily directed to the central axis of the supporting surface, so that in the process of sliding the supporting member 23 for a certain distance, the displacement of each of the middle members 24 connected to the supporting member 23 is not necessarily the same, and the included angles between the first matching portion 231 and the second matching portion 241 and the central axis are different, but the implementation difficulty is high, and the manufacturing is not easy.
The first driving member 21 is disposed between the supporting member 1 and the supporting member 23 to drive the supporting member 23 to slide, so that the plurality of supporting portions 242 support a circumferential surface of the workpiece. In this embodiment, the first driving member 21 is a spring, one end of the first driving member 21 abuts against the middle connecting shaft 12, the other end abuts against the abutting member 23, the first driving member 21 may also be a hydraulic cylinder or the like, in addition, in order to prevent the abutting member 23 from being separated from the mating member 22, a shoulder may be machined at one end of the mating member 22 to limit the abutting member 23, and in this embodiment, a pressing plate 25 is fixedly connected with the abutting member 23 to limit the position.
The workpiece is held and positioned by at least the two-part mechanism 2, and in at least one part mechanism 2: the matching piece 22 can rotate at an angle relative to the supporting piece 1, and the matching piece 22 is eccentrically arranged relative to the rotation center of the supporting piece 1 and the circle centers of the supporting surfaces of the plurality of middle-dividing pieces 24, so that the center distance supported by the two middle-dividing mechanisms 2 is changed. It is easy to understand that the variable center distance positioning device can be used for positioning any workpiece with two holes, and the supporting part can support the inner side surface of the workpiece and also can clamp the outer side surface of the workpiece, while in the embodiment, the workpiece is a connecting rod, each connecting rod is positioned by two sub-middle mechanisms 2, wherein the matching piece 22 of one sub-middle mechanism 2 is fixedly connected with the sub-middle connecting shaft 12, and in the embodiment, the matching piece 22 is in threaded connection; the mating member 22 in the other middle-dividing mechanism 2 and the middle-dividing connecting shaft 12 are rotatable relatively, and are fixedly connected by bolts, when the same center-distance-variable positioning device is used for clamping connecting rods with different center distances, only the connecting bolts of the mating member 22 and the middle-dividing connecting shaft 12 are required to be loosened, the mating member 22 is rotated to fix the mating member 22 at a proper angle, the two connecting bolts can be fixed after rotation, only the connecting hole positions of the mating member 22 and the middle-dividing connecting shaft 12 are required to be machined according to corresponding angles, the rotation angle is an integral multiple of the machining angle, in the embodiment, the middle-dividing mechanism 2 can clamp the connecting rods with two center distances, and the mating member 22180 is required to be rotated each time.
In order to ensure the air pressure balance at the two sides of the supporting member 23, the middle connecting shaft 12 should be provided with a pressure relief hole 121 to communicate with the outside, otherwise, the closing of the side of the supporting member 23 away from the middle member 24 can cause the supporting member 23 to be unable to slide.
In the present embodiment, the number of the middle parts 24 of the middle mechanism 2 is two, and the number of the middle parts 24 of the other middle mechanism 2 is three. Essentially, the centering mechanism 2 is mainly used for positioning to ensure that the boring cutter has the smallest machining amount along the radial direction of the connecting rod when the connecting rod is subjected to fine boring machining, and the fine machining must ensure that the feeding amount is small. In general, if the two middle parts 24 of the two middle mechanisms 2 are two, the positioning of the connecting rod can be achieved, but since the two middle mechanisms 2 are not rigidly pressed on the connecting rod, accurate positioning cannot be achieved, if the two middle parts 24 of the two middle mechanisms 2 are three, each middle mechanism 2 can respectively achieve positioning of a large hole and a small hole of the connecting rod, but if the error of the center distance of the connecting rod is large, the two middle parts 24 of the two middle mechanisms 2 are not pressed on the inner side surface of the connecting rod, and thus the positioning is inaccurate, the positioning is inconsistent, but the error of the positioning is generally controlled within the maximum feeding amount allowed by the boring cutter, preferably, one positioning mechanism accurately positions the corresponding connecting rod hole, and the other positioning mechanism limits the rotation of the connecting rod, namely, one middle mechanism 2 comprises the two middle parts 24, and the other middle mechanism 2 comprises the three middle parts 24.
The invention also provides a connecting rod fine boring fixture for positioning and clamping a workpiece, which is characterized by comprising the variable center distance positioning device, a fixing piece 3, a clamping piece 4, an anti-falling mechanism 5 and a second driving piece 6, wherein:
The positioning device with variable center distance is slidably connected with the fixing piece 3, specifically, the fixing piece 3 includes a fixing plate 31, a guiding sleeve 32 and a positioning block 33, the guiding sleeve 32 is fixed on the fixing plate 31, the guiding sleeve 32 is slidably connected with the centering connecting shaft 12, the second driving piece 6 is used for driving the positioning device with variable center distance to slide relative to the fixing piece 3, in this embodiment, one end of the second driving piece 6 is a hydraulic cylinder, the other end is fixed on the fixing plate 31 with a driving connecting block 7, a driving shaft of the second driving piece 6 is in threaded connection with the driving connecting block 7, the driving connecting block 7 is fixedly connected with the supporting plate 11, the fixed connections can all adopt bolt connection, so that the supporting plate 11 can be driven to move along the guiding sleeve 32, the centering mechanism 2 is axially separated from the supporting peripheral surface of the workpiece to be supported by the centering piece 24, one side of the positioning block 33 is fixedly connected with the fixing plate 31, the other opposite side is provided with an air detection hole 331, the workpiece is placed on the air detection hole 331, the air detection hole 331 is connected with an air source or negative pressure, when the air detection hole 331 is pressed against the connecting rod, the other end is fixedly connected with the supporting block 7, and the other end is fixedly connected with the supporting block 11, all the fixed by the connecting block is fixedly connected with the supporting rod, and the air sensor is installed on the air pressure sensor through the air pressure sensor.
The clamping piece 4 is fixedly connected with the fixing piece 3 and presses the workpiece against the fixing piece 3 to fix the workpiece, specifically, the clamping piece 4 comprises a fourth driving piece 41 and a pressing block 42, the fourth driving piece 41 is a corner hydraulic cylinder, and the corner hydraulic cylinder rotates and then presses down in operation, so that the pressing block 42 does not prevent the connecting rod from being installed in the middle mechanism 2 when the connecting rod is installed, one end of the fourth driving piece 41 is fixed on the fixing plate 31, and the other end of the fourth driving piece 41 is connected with the pressing block 42 and presses the connecting rod against the positioning block 33.
The anti-falling mechanism 5 comprises a guide member 51, a pressing member 52 and a third driving member 53, wherein the guide member 51 is fixedly connected with the fixing member 3, the guide member 51 is provided with a third sliding hole 511 and a matching groove 512 arranged on the periphery of the third sliding hole 511, one end of the pressing member 52 is abutted against the supporting member 1, the other end of the pressing member is abutted against a workpiece, a matching table 521 is formed on the side surface of the pressing member 52, the matching table 521 slides along the matching groove 512, the third driving member 53 is connected with the pressing member 52 and is used for driving the pressing member 52 to move along the clamping direction of the clamping member 4, the matching groove 512 is at least partially inclined, so that the pressing member 52 and the guide member 51 relatively slide and relatively rotate, and the third driving member 53 is a spring in the embodiment. Specifically, the anti-falling mechanism 5 further includes a retaining ring 55 and a connecting piece 56, the connecting piece 56 and the guiding piece 51 are both sleeved on the pressing piece 52, the connecting piece 56 and the guiding piece 51 are fixed on the fixing plate 31 by bolts, the third driving piece 53 is sleeved on the pressing piece 52 and is arranged between the two retaining rings 55, the two retaining rings 55 are sleeved on the pressing piece 52 and are arranged between the matching table 521 and a shaft shoulder of the connecting piece 56, so that the retaining ring 55 and the third driving piece 53 are limited.
As a preferred embodiment, the anti-falling mechanism 5 further includes an anti-falling rod 54, where the anti-falling rod 54 is fixedly connected with the fixing member 3, and is used for preventing the workpiece from falling to two sides after being separated from the pressing piece 52 and pressed.
In the process that the second driving member 6 axially breaks away from the supporting peripheral surface of the split member 24 of the workpiece and supports the workpiece, the pressing member 52 slides along the matching groove 512 under the action of the third driving member 53, so that the pressing member 52 rotates and presses against the side surface of the workpiece. That is, in the process that the second driving member 6 drives the supporting plate 11 to move, the middle part 24 is gradually separated from being in contact with the inner side surface of the connecting rod, due to the effect of the third driving member 53, the abutting part 52 is kept in contact with the supporting plate 11 and moves along with the supporting plate 11, meanwhile, the matching table 521 slides along the matching groove 512, the abutting part 52 slides towards the connecting rod and rotates, and finally abuts against the side surface of the connecting rod.
The working process of the connecting rod fine boring fixture provided by the invention is described in detail as follows: when the middle separating mechanism 2 is in the initial position, the middle separating member 24 is positioned at one side of the positioning block 33, the connecting rods are respectively arranged in the middle separating mechanism 2 correspondingly, the inner side surfaces of the connecting rods are provided with chamfers, the movable range of the middle separating member 24 is smaller, the contact part of the middle separating member 24 and the connecting rods is also provided with chamfers, at the moment, the chamfers at the inner sides of the connecting rods are just in contact with the chamfers of the middle separating member 24, the connecting rods can be pressed into the middle separating mechanism 2 by manually applying pressure to the connecting rods, the positioning of the connecting rods is completed, at the moment, the fourth driving member 41 can be started, the connecting rods are pressed against the positioning block 33, the clamping of the connecting rods is completed, at the moment, the second driving member 6 can be started, the supporting plate 11 is driven to move, and the middle separating mechanism 2 is driven to be separated from the connecting rods, meanwhile, the pressing piece 52 is made to slide and rotate to press against the side surface of the connecting rod, the air pressure at the position is changed due to the fact that the air detection hole 331 is blocked by the connecting rod, signals are sent to the machine tool, the connecting rod at the position is judged to be available, namely, fine boring processing is carried out on the connecting rod at the position, if the connecting rod at the position is not available, the processing at the position is skipped, after the processing is finished, the fourth driving piece 41 is directly loosened, the connecting rod cannot fall off due to the fact that the anti-falling rod 54 is arranged at the two ends of the connecting rod, in addition, the pressing piece 52 cannot fall down, when the connecting rod needs to be taken out, the pressing piece 52 is only required to be rotated to be separated from the pressing connecting rod, and after all the connecting rod is taken out, the second driving piece 6 is reset to wait for the connecting rod to be installed and processed next time.
In summary, the invention provides a variable center distance positioning device, wherein a centering piece is driven by a first driving piece and a supporting piece to position a connecting rod hole in a centering way, so that the hole coincides with the center of a centering mechanism, and the center of the centering mechanism corresponds to the center of a boring cutter before machining, so that the boring cutter does not need to be re-aligned when machining each time, and when the center distance of the centering mechanism is required to be adjusted, a matched piece is rotated, so that a set of positioning device is used for clamping connecting rods with different center distances, and the device can be also used for positioning any workpiece with multiple holes. The invention also provides a connecting rod fine boring clamp using the device, when in use, the connecting rod is pressed into the centering mechanism, then the clamping piece and the fixing piece clamp the connecting rod, the second driving piece drives the centering mechanism and the connecting rod to separate, meanwhile, the anti-falling mechanism is pressed on the side surface of the connecting rod, fine boring processing is carried out, after the processing is finished, the clamping piece is loosened, the connecting rod cannot fall down due to the fact that the anti-falling mechanism is pressed against the connecting rod, and the connecting rod can be taken out by manually pulling the anti-falling mechanism.
The above embodiments of the present invention do not limit the scope of the present invention. Any other corresponding changes and modifications made in accordance with the technical idea of the present invention shall be included in the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a connecting rod fine boring anchor clamps for location and centre gripping work piece, its characterized in that includes become centre-to-centre spacing positioner, mounting, clamping piece, anticreep mechanism, second driving piece, wherein:
The center distance changing positioning device comprises a supporting piece and a center dividing mechanism fixedly connected with the supporting piece, the center dividing mechanism comprises a first driving piece, a matching piece, a propping piece and a center dividing piece, the supporting piece comprises a supporting plate and a center dividing connecting shaft, one end of the center dividing connecting shaft is fixedly connected with the supporting plate, the other end of the center dividing connecting shaft is provided with a groove which is in sliding rotation connection with the matching piece or a groove which is in threaded connection with the matching piece, the matching piece is provided with a first sliding hole and a plurality of second sliding holes which are circumferentially arranged along the first sliding hole, one end of the propping piece is provided with a first matching part corresponding to the second sliding hole, the propping piece is in sliding connection with the first sliding hole, the center dividing piece is respectively in sliding connection with the second sliding holes, one end of the center dividing piece is provided with a second matching part, the first matching part is in sliding connection with the second matching part, the second matching part is in sliding connection with the second matching part, and the center dividing piece is provided with a plurality of first matching parts along the direction of the center dividing piece, and the center dividing piece is in sliding connection with the center dividing piece, and the center dividing piece is provided with a plurality of second matching parts along the first sliding hole, and the center dividing piece is in sliding connection with the second sliding hole, and the center dividing piece is respectively;
The workpiece is held and positioned by at least two of the centering mechanisms, and in at least one of the centering mechanisms: the matching piece can rotate at an angle relative to the supporting piece, and is eccentrically arranged relative to the rotation center of the supporting piece and the circle centers of the supporting surfaces of the plurality of middle parts, so that the center distance between the two middle parts which are supported by the middle parts is changed;
The second driving piece is used for driving the variable center distance positioning device to slide relative to the fixing piece and enabling the centering mechanism to axially separate from the workpiece to be supported along the circumferential surface of the workpiece supported by the centering piece;
The clamping piece is fixedly connected with the fixing piece, and the workpiece is pressed against the fixing piece to fix the workpiece;
The anti-disengaging mechanism comprises a guide piece, a pressing piece and a third driving piece, wherein the guide piece is fixedly connected with the fixing piece, a third sliding hole and a matching groove which is arranged on the periphery side of the third sliding hole are formed in the guide piece, one end of the pressing piece is abutted to the supporting piece, the other end of the pressing piece is abutted to the workpiece, a matching table is formed on the side face of the pressing piece, the matching table slides along the matching groove, the third driving piece is connected with the pressing piece and is used for driving the pressing piece to move along the clamping direction of the clamping piece, and the matching groove is at least partially obliquely arranged, so that the pressing piece and the guide piece relatively slide and simultaneously relatively rotate;
and the second driving piece slides along the matching groove under the action of the third driving piece in the process that the second driving piece axially breaks away from the supporting peripheral surface of the workpiece supported by the middle part and supports against the side surface of the workpiece.
2. The connecting rod fine boring jig according to claim 1, wherein the number of the centering mechanisms for positioning the workpiece is two, wherein the mating member of one centering mechanism is fixedly connected with the supporting member, and the mating member of the other centering mechanism is relatively rotatable and fixedly connected with the supporting member.
3. The connecting rod fine boring jig according to claim 2, wherein the number of the split pieces of one of the split mechanisms is two, and the number of the split pieces of the other of the split mechanisms is three.
4. The connecting rod fine boring fixture according to claim 1, wherein the fixing piece comprises a fixing plate and a locating block, one side of the locating block is fixedly connected with the fixing plate, the other opposite side is provided with a gas detection hole, and the workpiece is placed on the gas detection hole.
5. The connecting rod fine boring jig according to claim 1, wherein the anti-falling mechanism further comprises an anti-falling rod fixedly connected with the fixing member and used for preventing the workpiece from falling to two sides after being separated from the pressing part.
6. The connecting rod fine boring clamp according to claim 1, wherein the clamping piece comprises a fourth driving piece and a pressing block, one end of the fourth driving piece is fixedly connected with the fixing piece, and the other end of the fourth driving piece is fixedly connected with the pressing block.
7. The connecting rod fine boring jig of claim 6, wherein the fourth driving member is a corner hydraulic cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110009677.1A CN112846296B (en) | 2021-01-05 | 2021-01-05 | Center distance variable positioning device and connecting rod fine boring clamp using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110009677.1A CN112846296B (en) | 2021-01-05 | 2021-01-05 | Center distance variable positioning device and connecting rod fine boring clamp using same |
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| CN112846296B true CN112846296B (en) | 2024-05-14 |
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| CN112846296A (en) | 2021-05-28 |
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