CN211681010U - Special fixture for sprocket thin-wall part precision boring process - Google Patents

Special fixture for sprocket thin-wall part precision boring process Download PDF

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Publication number
CN211681010U
CN211681010U CN201922436056.2U CN201922436056U CN211681010U CN 211681010 U CN211681010 U CN 211681010U CN 201922436056 U CN201922436056 U CN 201922436056U CN 211681010 U CN211681010 U CN 211681010U
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CN
China
Prior art keywords
sprocket
pressing plate
positioning
thin
locking pressing
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Application number
CN201922436056.2U
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Chinese (zh)
Inventor
王建定
徐孙传
蒋金荣
刘钧
居秀琴
张文泉
张长宽
张禹
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
DONGHUA CHAIN XINGHUA Co.,Ltd.
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Xinghua Donghua Gear Co ltd
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Priority to CN201922436056.2U priority Critical patent/CN211681010U/en
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Abstract

The utility model provides a special fixture for a sprocket thin-wall part precision boring process, which comprises a positioning ring, a sprocket positioning pin, a locking pressing plate and an end face positioning screw; when the chain wheel is placed in the positioning ring, the chain tooth positioning pin is clamped between two adjacent chain teeth of the chain wheel; the locking pressing plate is a circular pressing plate, external threads matched with the internal threads are arranged on the outer side wall of the locking pressing plate, the outer diameter of the locking pressing plate is equal to the inner diameter of the annular baffle, and the end face positioning screw is arranged on the top face of the locking pressing plate. The utility model discloses compare with present used three-jaw anchor clamps, adopt axial positioning, side to compress tightly chain piece formula anchor clamps, carry out the monolithic stationary to the sprocket, can avoid yielding problem behind the radial atress of thin wall spare to with the sprocket fixed avoid its rotation, can effectively avoid the problem of drilling position degree overproof.

Description

Special fixture for sprocket thin-wall part precision boring process
Technical Field
The utility model relates to a gear production special fixture especially relates to a sprocket thin wall spare finish boring technology special fixture.
Background
The sprocket is a wheel with cogged sprocket teeth for meshing with precisely pitched blocks on a chain link or cable. In the current fine boring process of the chain wheel, a common three-jaw clamp is used for clamping the chain wheel, 51507919 the excircle phi 220 of the chain wheel part is large, the middle hole phi 160 is large, the wall thickness is 14, and the chain wheel belongs to a thin-wall part; the three-jaw clamp clamps 51507919 sprocket part, when the periphery of the inboard thin wall of sprocket part carries out the precision boring, the thin wall spare is yielding after radial atress for the hole of precision boring appears aperture discrepancy and drilling position degree discrepancy scheduling problem, and the production qualification rate is lower, and the waste product that produces is many. Therefore, a special clamp is needed, the deformation problem can be solved when the inner hole of the thin-wall part is turned, and the production qualified rate is improved.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that the deformation of the chain wheel thin-wall part clamped by the three-jaw clamp when the inner hole is turned is caused by the deformation of the chain wheel thin-wall part in the prior art, and providing the special clamp for the fine boring process of the chain wheel thin-wall part.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a special clamp for a fine boring process of a thin-walled part of a chain wheel comprises a positioning ring, a sprocket positioning pin, a locking pressing plate and an end face positioning screw; the positioning ring comprises an annular bottom plate, the outer edge of the bottom plate vertically extends upwards to form an annular baffle plate, internal threads are arranged on the inner side wall of the annular baffle plate, the sprocket positioning pin is installed on the bottom plate, and when the sprocket is placed in the positioning ring, the sprocket positioning pin is clamped between two adjacent sprockets of the sprocket; the locking pressing plate is a circular pressing plate, external threads matched with the internal threads are arranged on the outer side wall of the locking pressing plate, the outer diameter of the locking pressing plate is equal to the inner diameter of the annular baffle, the locking pressing plate is detachably mounted in the positioning ring, and the end face positioning screws are mounted on the top face of the locking pressing plate.
Preferably, the number of the sprocket positioning pins is 3, and the 3 sprocket positioning pins are distributed in a triangular shape and trisect the bottom plate.
Preferably, the sprocket positioning pin has a length equal to or less than the height of the sprocket.
Preferably, the sprocket positioning pin is a cylindrical positioning pin, and when the sprocket is placed in the positioning ring, the smooth sidewall of the sprocket positioning pin is clamped between two adjacent sprockets of the sprocket.
Preferably, the inner ring diameter of the base plate is smaller than the intermediate ring diameter of the sprocket.
Preferably, the top surface of the locking pressure plate is circular ring-shaped, and the width of the top surface of the locking pressure plate is equal to or less than the length of the sprocket teeth.
Preferably, the top surface and the bottom surface of the locking pressure plate are both smooth planes.
Preferably, the number of the end face positioning screws is at least two and is uniformly distributed on the top face of the locking pressure plate.
Preferably, the top surface of the locking pressure plate is provided with a threaded hole, and the end face positioning screw is installed in the threaded hole.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a pair of sprocket thin wall spare finish boring technology special fixture, sprocket are placed in the position circle, and the locking clamp plate is pressed in the top of sprocket and is screwed in the inside of position circle through internal thread and external screw thread, is equipped with the sprocket locating pin card in the position circle and fixes between two adjacent chain intertooth at the sprocket, prevents its at the position circle internal rotation with the sprocket is fixed. The utility model discloses compare with present used three-jaw anchor clamps, adopt axial positioning, side to compress tightly chain piece formula anchor clamps, carry out the monolithic stationary to the sprocket, can avoid yielding problem behind the radial atress of thin wall spare to with the sprocket fixed avoid its rotation, can effectively avoid the problem of drilling position degree overproof, to 51507919 sprocket such thin wall spare, the utility model discloses convenient operation can guarantee the sprocket indeformable in fixed sprocket, further guarantees the position and the size precision of sprocket precision bore hole, improves the qualification rate of sprocket precision bore hole by a wide margin, improves production efficiency.
Drawings
FIG. 1 is a schematic perspective view of a special fixture for a sprocket thin-wall part fine boring process;
FIG. 2 is a schematic view of the sprocket being disposed in the retainer ring;
fig. 3 is a schematic view of the structure in which the locking pressure plate is placed on the sprocket.
Detailed Description
In order to further understand the objects, structures, features and functions of the present invention, the following embodiments are described in detail.
Referring to fig. 1 to 3, the present invention provides a special fixture for fine boring of thin-walled sprocket parts, which is used to clamp thin-walled sprocket parts such as 51507919 sprocket wheels, and includes a positioning ring 1, sprocket positioning pins 2, a locking pressing plate 3 and end face positioning screws 4;
the positioning ring 1 comprises an annular bottom plate 11, the edge of the outer ring of the bottom plate 11 vertically extends upwards to form an annular baffle plate 12, internal threads 13 are arranged on the inner side wall of the annular baffle plate 12, the sprocket positioning pin 2 is installed on the bottom plate 11, and when the sprocket 5 is placed in the positioning ring 1, the sprocket positioning pin 2 is clamped between two adjacent sprockets 51 of the sprocket 5; locking clamp plate 3 is the annular clamp plate of circle, is equipped with on the lateral wall of locking clamp plate 3 with internal thread 13 assorted external screw thread 31, the external diameter of locking clamp plate 3 equals the internal diameter of annular baffle 12, locking clamp plate 3 detachably installs in position circle 1, and the top surface at locking clamp plate 3 is installed to terminal surface set screw 4.
When in use, the chain wheel 5 is placed inside the positioning ring 1, the chain wheel 5 comprises chain teeth 51 and a chain wheel face 52 at the inner side of the chain teeth 51, the chain wheel 5 clamped by the clamp of the utility model is a thin-wall piece, namely the central hole 54 of the chain wheel 5 is larger, the thickness of the chain wheel 5 is smaller, such as 51507919 chain wheel parts, the excircle phi 220, the middle hole phi 160, the wall thickness 14, the chain wheel face 52 is narrower, the area is smaller, when the hole needs to be finely bored on the chain wheel face 52, the precision needs to be ensured because the aperture of the inner hole 53 is smaller, but the commonly used three-jaw clamp is clamped in the chain tooth 51 gap of the chain wheel 5 and radially applies force to tighten, the chain wheel 5 is easy to deform, so that the position and the size of the inner hole 53 are out of tolerance, the utility model aims at the problems, the upper and lower plane parts of the chain wheel 5 are integrally pressed and fixed by the positioning ring 1 and the locking pressing plate 3, the original fixing mode, the problem of deformation of the sprocket 5 can be avoided, and the dimensional over-tolerance of the inner hole 53 can be effectively prevented. In addition, sprocket locating pin 2 in position circle 1 blocks admittedly in sprocket 51, can the position of fixed sprocket 5, prevents it at position circle 1 internal rotation, has effectively solved the problem that hole 53 position is out of tolerance. Be equipped with terminal surface set screw 4 on the locking clamp plate 3, can play the effect of handle, because locking clamp plate 3 and position circle 1 rely on internal thread 13 and external screw thread 31 matching to connect soon, can hand terminal surface set screw 4 application of force when revolving soon locking clamp plate 3, when the sprocket 51 of locking clamp plate 3 hold-down sprocket 5, terminal surface set screw 4 aims at the space in the middle of sprocket 51, can revolve the card with terminal surface set screw 4 and revolve soon and fix in the middle of sprocket 51, further strengthen the axial positioning effect.
Preferably, the number of the sprocket positioning pins 2 is 3, and 3 sprocket positioning pins 2 are distributed in a triangular shape and trisect the bottom plate 11. The three sprocket locating pins 2 which are distributed in a triangular shape can firmly clamp the chain wheel 5, so that a better anti-rotation effect is obtained.
Preferably, the length of the sprocket positioning pin 2 is equal to or less than the height of the sprocket 5. Because the locking pressing plate 3 covers and presses the chain wheel 5, the height of the chain tooth positioning pin 2 is smaller than that of the chain wheel 5, so that the locking pressing plate 3 is fully contacted with the chain wheel 5, and a better locking effect is achieved.
Preferably, the sprocket positioning pin 2 is a cylindrical positioning pin, and when the sprocket 5 is placed in the positioning ring 1, the smooth sidewall of the sprocket positioning pin 5 is clamped between two adjacent sprockets 51 of the sprocket 5, so that the sprocket positioning pin 2 does not wear or scratch the surface of the sprocket 51 when clamping the sprockets 51 of the sprocket 5.
Preferably, the inner ring diameter of the bottom plate 11 is smaller than the middle ring diameter of the chain wheel 5, that is, when the chain wheel 5 is located inside the positioning ring 1, the bottom surfaces of the chain wheels 5 are all located on the bottom plate 11, so that the chain wheel 5 is well supported, and the stability of the chain wheel 5 is maintained.
Preferably, the top surface of the locking pressing plate 3 is circular ring-shaped, and the width of the top surface of the locking pressing plate 3 is equal to or less than the length of the sprocket 51 of the sprocket 5, leaving the sprocket wheel surface 52 of the sprocket 5 to be finely bored for convenient operation.
Preferably, the top surface and the bottom surface of the locking pressing plate 3 are both smooth planes, so that the chain wheel 5 is not damaged due to uneven stress on the surface while the chain wheel 5 is further pressed conveniently.
Preferably, the number of the end face positioning screws 4 is at least two and is uniformly distributed on the top face of the locking pressure plate 3. Further, the top surface of the locking pressing plate 3 is provided with a threaded hole, and an end face positioning screw is installed in the threaded hole. The length of the internal thread 13 and the external thread 31 can be set so that the end positioning screw 4 is exactly aligned in the sprocket 51 gap when the locking pressure plate 3 is screwed to the end point and is offset from the sprocket positioning pin 2, and then the end positioning screw 4 is screwed down into the sprocket 51 gap to further position and fix the sprocket 51 and prevent it from rotating in the retainer ring 1.
From above, the utility model discloses compare with present used three-jaw anchor clamps, the mode of extrusion locking carries out the monolithic stationary about adopting to the sprocket, can avoid yielding problem behind the radial atress of thin wall spare to with the sprocket fixed avoid its rotation, can effectively avoid the problem of drilling position degree overproof, to 51507919 thin wall spare such sprocket, the utility model discloses convenient operation can guarantee the sprocket indeformable in fixed sprocket, further guarantees the position and the size precision of sprocket precision bore hole, improves the qualification rate of sprocket precision bore hole by a wide margin, improves production efficiency.
The present invention has been described in relation to the above embodiments, which are only examples for implementing the present invention. It should be noted that the disclosed embodiments do not limit the scope of the invention. On the contrary, all changes and modifications which do not depart from the spirit and scope of the present invention are deemed to fall within the scope of the present invention.

Claims (9)

1. The special fixture for the fine boring process of the sprocket thin-wall part is characterized in that: the device comprises a positioning ring, sprocket positioning pins, a locking pressing plate and end face positioning screws; the positioning ring comprises an annular bottom plate, the outer edge of the bottom plate vertically extends upwards to form an annular baffle plate, internal threads are arranged on the inner side wall of the annular baffle plate, the sprocket positioning pin is installed on the bottom plate, and when the sprocket is placed in the positioning ring, the sprocket positioning pin is clamped between two adjacent sprockets of the sprocket; the locking pressing plate is a circular pressing plate, external threads matched with the internal threads are arranged on the outer side wall of the locking pressing plate, the outer diameter of the locking pressing plate is equal to the inner diameter of the annular baffle, the locking pressing plate is detachably mounted in the positioning ring, and the end face positioning screws are mounted on the top face of the locking pressing plate.
2. The special fixture for the fine boring process of the sprocket thin-wall part according to claim 1, wherein: the number of the sprocket positioning pins is 3, and the 3 sprocket positioning pins are distributed in a triangular shape and trisect the bottom plate.
3. The special fixture for the fine boring process of the sprocket thin-wall part according to claim 1, wherein: the length of the sprocket positioning pin is equal to or less than the height of the sprocket.
4. The special fixture for the fine boring process of the sprocket thin-wall part according to claim 1, wherein: the sprocket positioning pin is a cylindrical positioning pin, and when the sprocket is placed in the positioning ring, the smooth side wall of the sprocket positioning pin is clamped between two adjacent sprockets of the sprocket.
5. The special fixture for the fine boring process of the sprocket thin-wall part according to claim 1, wherein: the diameter of the inner ring of the bottom plate is smaller than that of the middle ring of the chain wheel.
6. The special fixture for the fine boring process of the sprocket thin-wall part according to claim 1, wherein: the top surface of the locking pressing plate is circular, and the width of the top surface of the locking pressing plate is equal to or smaller than the length of the chain teeth of the chain wheel.
7. The special fixture for the fine boring process of the sprocket thin-wall part according to claim 1, wherein: the top surface and the bottom surface of the locking pressing plate are both smooth planes.
8. The special fixture for the fine boring process of the sprocket thin-wall part according to claim 1, wherein: the number of the end face positioning screws is at least two and is uniformly distributed on the top face of the locking pressing plate.
9. The special fixture for the fine boring process of the sprocket thin-wall part according to claim 8, wherein: the top surface of the locking pressing plate is provided with a threaded hole, and the end face positioning screw is installed in the threaded hole.
CN201922436056.2U 2019-12-30 2019-12-30 Special fixture for sprocket thin-wall part precision boring process Active CN211681010U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201922436056.2U CN211681010U (en) 2019-12-30 2019-12-30 Special fixture for sprocket thin-wall part precision boring process

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922436056.2U CN211681010U (en) 2019-12-30 2019-12-30 Special fixture for sprocket thin-wall part precision boring process

Publications (1)

Publication Number Publication Date
CN211681010U true CN211681010U (en) 2020-10-16

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Application Number Title Priority Date Filing Date
CN201922436056.2U Active CN211681010U (en) 2019-12-30 2019-12-30 Special fixture for sprocket thin-wall part precision boring process

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113182952A (en) * 2021-05-29 2021-07-30 温岭市明华齿轮有限公司 Centering non-deformable grinding hole pitch circle clamp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113182952A (en) * 2021-05-29 2021-07-30 温岭市明华齿轮有限公司 Centering non-deformable grinding hole pitch circle clamp

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GR01 Patent grant
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TR01 Transfer of patent right

Effective date of registration: 20201223

Address after: No. 10, Chengnan West Road, Xinghua City, Taizhou, Jiangsu

Patentee after: DONGHUA CHAIN XINGHUA Co.,Ltd.

Address before: No.26 Wuli West Road, Xinghua City, Taizhou City, Jiangsu Province

Patentee before: XINGHUA DONGHUA GEAR Co.,Ltd.