CN214161416U - Special fixture for milling key groove planes at two ends of crankshaft - Google Patents
Special fixture for milling key groove planes at two ends of crankshaft Download PDFInfo
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- CN214161416U CN214161416U CN202022519574.3U CN202022519574U CN214161416U CN 214161416 U CN214161416 U CN 214161416U CN 202022519574 U CN202022519574 U CN 202022519574U CN 214161416 U CN214161416 U CN 214161416U
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- 238000003801 milling Methods 0.000 title claims abstract description 23
- 230000007246 mechanism Effects 0.000 claims abstract description 19
- 230000001360 synchronised effect Effects 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000003754 machining Methods 0.000 abstract description 13
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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Abstract
The utility model provides a special fixture of crankshaft milling both ends keyway plane, includes: the numerical control rotary table comprises a clamp bottom plate, a numerical control rotary table and a hydraulic tailstock, wherein the numerical control rotary table and the hydraulic tailstock are oppositely arranged on the clamp bottom plate; a coarse positioning device for supporting the crankshaft workpiece is arranged on the clamp bottom plate, and a top mechanism for tightly abutting against center holes at two ends of the crankshaft workpiece is arranged on the hydraulic tailstock and the numerical control rotary table; the leveling mechanism clamps a connecting rod neck of the crankshaft workpiece and enables the connecting rod neck and a main journal of the crankshaft workpiece to be positioned at the same level, and the auxiliary fixing device is used for clamping the main journal. In the utility model, the thick positioning device is arranged to facilitate the hydraulic tailstock and the numerical control rotary table to tightly support the center holes at the two ends of the crankshaft workpiece, so that the center positioning operation is convenient; and adopt leveling mechanism chucking connecting rod neck to carry out the leveling after, make bent axle machined surface position accurate, supplementary fixing device chucking main shaft neck in the course of working prevents not accurate because of the machining precision that the vibration that produces in the work piece course of working caused.
Description
The technical field is as follows:
the utility model relates to a bent axle mills technical field, in particular to mill bent axle main journal and allies oneself with special fixture of dry neck.
Background art:
the crankshaft of the automobile engine needs to be provided with parts such as gears and the like, a main journal plane, a semicircular key groove or a flat key groove needs to be processed, and the crankshaft has high requirements on symmetry, parallelism and the like. The existing clamping mechanism has pneumatic, hydraulic or manual clamping or positioning, and has the problems that the positioning accuracy of the clamp is poor, the crankshaft of an automobile engine cannot be clamped and positioned effectively, and the requirements for batch flexible processing and automatic production cannot be met.
The stress of a crankshaft workpiece is uneven during machining, the crankshaft can slightly deviate due to the generation of large milling force during milling by a milling machine, the position of the crankshaft can deviate particularly during machining of the semicircular key groove, and the crankshaft which deviates beyond a certain deviation is an unqualified crankshaft.
The utility model has the following contents:
in view of the above, there is a need for a special fixture for milling key slot planes at two ends of a crankshaft, which can overcome the above problems.
The utility model provides a special fixture of crankshaft milling both ends keyway plane, includes: the numerical control rotary table comprises a fixture bottom plate, a numerical control rotary table and a hydraulic tailstock, wherein the numerical control rotary table and the hydraulic tailstock are oppositely arranged on the fixture bottom plate; wherein,
a coarse positioning device for supporting a crankshaft workpiece is arranged on the fixture bottom plate, and tip mechanisms for abutting against central holes at two ends of the crankshaft workpiece are arranged on the hydraulic tailstock and the numerical control rotary table;
the leveling mechanism clamps a connecting rod neck of the crankshaft workpiece and enables the connecting rod neck and a main journal of the crankshaft workpiece to be located at the same level, and the auxiliary fixing device is used for clamping the main journal.
Preferably, a hydraulic tailstock base plate is fixedly arranged on the fixture base plate, and the hydraulic tailstock is slidably connected with the hydraulic tailstock base plate and can be locked at a set position.
Preferably, the rough positioning device is a workpiece rough positioning V-shaped support which is detachably and fixedly connected to the fixture bottom plate.
Preferably, the tip mechanism comprises: the telescopic sleeve center is arranged on the hydraulic tailstock, and the chuck center is arranged on the numerical control rotary table; wherein,
the tip of the telescopic sleeve tip is horizontally opposite to the tip of the chuck tip.
Preferably, a transmission shaft of the numerical control rotary table is connected with a hydraulic chuck, and a chuck tip is located at the inner circle center of the hydraulic chuck.
Preferably, one end of the crankshaft workpiece is clamped and fixed by the hydraulic chuck.
Preferably, the numerical control rotary table is provided with a hydraulic chuck cylinder connected with the hydraulic chuck.
Preferably, the leveling mechanism includes: the clamp comprises a sliding table base plate arranged on the clamp base plate, a pneumatic sliding table connected to the sliding table base plate in a sliding mode and a sliding table V-shaped jaw assembled on the pneumatic sliding table; wherein,
the sliding table V-shaped jaw is matched and clamped with the connecting rod neck.
Preferably, the auxiliary fixing device is a synchronous hydraulic fixture which is arranged on the fixture bottom plate in a sliding manner; the synchronous hydraulic clamp is matched and clamped with the main journal.
Preferably, the V-shaped jaws of the sliding table and the clamping surfaces of the synchronous hydraulic clamps are provided with anti-skid stripes.
In the utility model, the thick positioning device is arranged to facilitate the hydraulic tailstock and the numerical control rotary table to tightly support the center holes at the two ends of the crankshaft workpiece, so that the center positioning operation is convenient; and adopt leveling mechanism chucking connecting rod neck to carry out the leveling after, make bent axle machined surface position accurate, supplementary fixing device chucking main shaft neck in the course of working prevents not accurate because of the machining precision that the vibration that produces in the work piece course of working caused.
Description of the drawings:
FIG. 1 is a schematic three-dimensional structure diagram of a special fixture for milling key groove planes at two ends of a crankshaft;
FIG. 2 is a side view of the special fixture for milling key grooves on two ends of the crankshaft;
FIG. 3 is an end view of the special fixture for milling key groove planes at two ends of the crankshaft;
figure 4 is the utility model provides a bent axle mills top view of special fixture in both ends keyway plane.
In the figure:
a fixture bottom plate-1, a hydraulic tailstock base plate-2, a hydraulic tailstock-3, a crankshaft workpiece-4, a chuck center-5, a hydraulic chuck-6, a numerical control rotary table-7, a pneumatic sliding table-8, a sliding table base plate-9, a hydraulic chuck oil cylinder-10, a rotary table base plate-11, a workpiece rough positioning V-shaped support-12, a synchronous hydraulic fixture-13, a synchronous hydraulic fixture base plate
14, a sliding table V-shaped jaw-15.
The specific implementation mode is as follows:
referring to fig. 1-4 together, a special fixture for milling key groove planes at two ends of a crankshaft comprises: a fixture base plate 1; the fixture bottom plate 1 is fixedly assembled inside a machining workshop, and the position of the fixture bottom plate 1 is matched with the machining position of a machine tool.
One end of the fixture bottom plate 1 is provided with a numerical control rotary table 7, and the other end is provided with a hydraulic tailstock 3; the numerical control rotary table 7 is fixedly assembled on the clamp bottom plate 1 through a rotary table base plate 11, the hydraulic tailstock 3 is assembled on the clamp bottom plate 1 in a sliding mode through a hydraulic tailstock base plate 2, and the numerical control rotary table 7 is opposite to the hydraulic tailstock 3 and abuts against the center holes in the two ends of the crankshaft workpiece 4 through a tip mechanism.
The hydraulic tailstock 3 is adjusted in a sliding mode, and a 300mm-900mm long crankshaft workpiece 4 is machined by adjusting the distance between the hydraulic tailstock 3 and the numerical control rotary table 7. Specifically, fixed being provided with hydraulic pressure tailstock backing plate 2 on the fixture bottom plate 1, and hydraulic pressure tailstock 3 and hydraulic pressure tailstock backing plate 2 sliding connection and lockable are in setting for the position. The sliding mode adopts sliding modes such as a sliding chute, a sliding block and the like to enable the hydraulic tailstock 3 to slide along the length direction of the hydraulic tailstock base plate 2, so that approximate distance adjustment is carried out on crankshaft workpieces 4 with different lengths. The clamping mode adopts the modes of jackscrews and the like for clamping and fixing, and the distance between the hydraulic tailstock 3 and the numerical control rotary table 7 is ensured to be unchanged when the crankshaft workpiece 4 is processed.
In addition, when the center holes at the two ends of the crankshaft workpiece 4 are abutted against the center of a circle for positioning, the center mechanism in the embodiment comprises: a telescopic sleeve centre arranged on the hydraulic tailstock 3 and a chuck centre 5 arranged on the numerical control rotary table 7; the telescope tip is horizontally opposite the tip of the chuck tip 5. A transmission shaft of the numerical control rotary table 7 is connected with a hydraulic chuck 6, and a chuck tip 5 is positioned at the inner circle center of the hydraulic chuck 6. The numerical control rotary table 7 is provided with a hydraulic chuck oil cylinder 10 connected with the hydraulic chuck 6, so that after the machining position of the crankshaft workpiece 4 is adjusted, the hydraulic chuck 6 clamps and fixes one end of the crankshaft workpiece 4, and when the machining surface position is adjusted, the numerical control rotary table 7 is started to drive the crankshaft workpiece 4 to rotate circumferentially.
Meanwhile, when the central holes at the two ends of the crankshaft workpiece 4 are positioned at the same height with the tip mechanism, a coarse positioning device for supporting the crankshaft workpiece 4 is arranged on the fixture bottom plate 1, and the coarse positioning device is a workpiece coarse positioning V-shaped support 12 which is detachably and fixedly connected to the fixture bottom plate 1. The V-shaped bracket 12 for coarse positioning of the workpieces is detachably and fixedly connected, and the crankshaft workpieces 4 can be centered by manually holding the detachable coarse positioning device for the crankshaft workpieces 4 with the length of 300-500 mm in batches. The workpiece rough positioning V-shaped bracket 12 is connected to the fixture bottom plate 1 by bolts.
In addition, after the centers of the two ends of the crankshaft workpiece 4 are positioned, in order to fix the positions of the main journal plane, the semicircular key groove and the key groove processing surface of the crankshaft workpiece 4 and facilitate the processing, the present embodiment further includes a leveling mechanism disposed on the fixture base plate 1. This leveling mechanism includes: the pneumatic sliding table comprises a sliding table base plate 9 arranged on the fixture base plate 1, a pneumatic sliding table 8 connected to the sliding table base plate 9 in a sliding mode, and a sliding table V-shaped jaw 15 assembled on the pneumatic sliding table 8; wherein, the slipway V-shaped jaw 15 is matched and clamped with the connecting rod neck. The pneumatic sliding table 8 is arranged to be slidable, so that the V-shaped jaw 15 of the sliding table and the corresponding connecting rod neck can be adjusted left and right when crankshaft workpieces 4 with different lengths are machined. The pneumatic sliding table 8 extends forwards to form a V-shaped jaw 15 of the sliding table to abut against the position of the connecting rod neck, so that the connecting rod neck and the main journal are positioned on the same horizontal plane, and the machine tool processing is facilitated.
In addition, in order to enhance the processing precision of the crankshaft workpiece 4, the problem of inaccurate processing precision caused by vibration force generated in the milling process is avoided; in the embodiment, the main journal is clamped by the auxiliary fixing device in the machining process. Specifically, the auxiliary fixing device is a synchronous hydraulic fixture 13 which is arranged on the fixture bottom plate 1 in a sliding manner; the synchronous hydraulic clamp 13 is matched and clamped with the main journal. The synchronous hydraulic clamp 13 is slidably assembled on the clamp base through the synchronous hydraulic clamp backing plate 14, so that when crankshaft workpieces 4 with different lengths are machined, the synchronous hydraulic clamp 13 is adjusted left and right corresponding to the main journal.
In the structure, when crankshaft workpieces 4 with different batch lengths are machined, the approximate distance between the hydraulic tailstock 3 and the numerical control rotary table 7 is adjusted, after the crankshaft workpieces 4 are placed on the workpiece rough positioning V-shaped support 12, the sleeves on the hydraulic tailstock 3 extend to enable the central holes at the two ends of the crankshaft workpieces 4 to be respectively abutted against the telescopic sleeve tip and the chuck tip 5, and the crankshaft workpieces 4 are centered; the pneumatic sliding table 8 extends forwards, and the V-shaped jaw 15 of the sliding table is tightly pressed against a connecting rod neck of the crankshaft workpiece 4, so that the main journal and the connecting rod neck are positioned on the same horizontal plane; the hydraulic chuck 6 clamps one end of the crankshaft workpiece 4, and the synchronous hydraulic clamp 13 clamps the main journal, so that the crankshaft workpiece 4 is prevented from vibrating during machining and the machining precision is prevented from being influenced; the pneumatic sliding table 8 returns to reset, the machine tool starts to process a plane, after the processing is finished, the synchronous hydraulic fixture 13 is loosened, the numerical control rotary table 7 rotates clockwise, and after the numerical control rotary table rotates to the position, the synchronous hydraulic fixture 13 is clamped again to perform the next processing. After the machining is finished, the numerical control rotary table 7 rotates anticlockwise to return to the original position, the hydraulic chuck 6, the hydraulic tailstock 3 and the synchronous hydraulic fixture 13 are loosened, the crankshaft workpiece 4 falls on the workpiece rough positioning V-shaped support 12, and the crankshaft workpiece 4 is taken out.
In the utility model, the thick positioning device is arranged to facilitate the hydraulic tailstock 3 and the numerical control rotary table 7 to tightly support the center holes at the two ends of the crankshaft workpiece 4, so that the center positioning operation is convenient; and adopt leveling mechanism chucking connecting rod neck to carry out the leveling after, make bent axle machined surface position accurate, supplementary fixing device chucking main shaft neck in the course of working prevents not accurate because of the machining precision that the vibration that produces in the work piece course of working caused.
Claims (10)
1. The utility model provides a special fixture of crankshaft milling both ends keyway plane which characterized in that includes: the numerical control rotary table comprises a fixture bottom plate, a numerical control rotary table and a hydraulic tailstock, wherein the numerical control rotary table and the hydraulic tailstock are oppositely arranged on the fixture bottom plate; wherein,
a coarse positioning device for supporting a crankshaft workpiece is arranged on the fixture bottom plate, and tip mechanisms for abutting against central holes at two ends of the crankshaft workpiece are arranged on the hydraulic tailstock and the numerical control rotary table;
the leveling mechanism clamps a connecting rod neck of the crankshaft workpiece and enables the connecting rod neck and a main journal of the crankshaft workpiece to be located at the same level, and the auxiliary fixing device is used for clamping the main journal.
2. The special fixture for milling key grooves on two ends of a crankshaft as claimed in claim 1, wherein a hydraulic tailstock cushion plate is fixedly arranged on the bottom plate of the fixture, and the hydraulic tailstock cushion plate are slidably connected and can be locked at a set position.
3. The special fixture for milling key grooves in two ends of a crankshaft as claimed in claim 1, wherein the coarse positioning device is a workpiece coarse positioning V-shaped bracket which is detachably and fixedly connected to a bottom plate of the fixture.
4. A special fixture for milling key grooves on two ends of a crankshaft according to any one of claims 1 to 3, wherein the tip mechanism comprises: the telescopic sleeve center is arranged on the hydraulic tailstock, and the chuck center is arranged on the numerical control rotary table; wherein,
the tip of the telescopic sleeve tip is horizontally opposite to the tip of the chuck tip.
5. The special fixture for milling key grooves in two ends of a crankshaft as claimed in claim 4, wherein a hydraulic chuck is connected to a transmission shaft of the numerical control turntable, and a top of the chuck is located at the center of the inner circle of the hydraulic chuck.
6. The special fixture for milling key grooves in two ends of a crankshaft as claimed in claim 5, wherein one end of the crankshaft workpiece is clamped and fixed by the hydraulic chuck.
7. The special fixture for milling key grooves in two ends of a crankshaft as claimed in claim 5, wherein the numerical control turntable is provided with a hydraulic chuck cylinder connected with the hydraulic chuck.
8. The special fixture for milling key grooves on two ends of a crankshaft as claimed in claim 1, wherein the leveling mechanism comprises: the clamp comprises a sliding table base plate arranged on the clamp base plate, a pneumatic sliding table connected to the sliding table base plate in a sliding mode and a sliding table V-shaped jaw assembled on the pneumatic sliding table; wherein,
the sliding table V-shaped jaw is matched and clamped with the connecting rod neck.
9. The special fixture for milling key grooves on two ends of a crankshaft as claimed in claim 8, wherein the auxiliary fixing device is a synchronous hydraulic fixture slidably arranged on a bottom plate of the fixture; the synchronous hydraulic clamp is matched and clamped with the main journal.
10. The special fixture for milling key groove planes at two ends of a crankshaft as claimed in claim 9, wherein the V-shaped jaws of the sliding table and the clamping surfaces of the synchronous hydraulic fixture are provided with anti-skid stripes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022519574.3U CN214161416U (en) | 2020-11-04 | 2020-11-04 | Special fixture for milling key groove planes at two ends of crankshaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022519574.3U CN214161416U (en) | 2020-11-04 | 2020-11-04 | Special fixture for milling key groove planes at two ends of crankshaft |
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| Publication Number | Publication Date |
|---|---|
| CN214161416U true CN214161416U (en) | 2021-09-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022519574.3U Active CN214161416U (en) | 2020-11-04 | 2020-11-04 | Special fixture for milling key groove planes at two ends of crankshaft |
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| CN (1) | CN214161416U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112222431A (en) * | 2020-11-04 | 2021-01-15 | 宁夏宏源长城机床有限公司 | Special fixture for milling key groove planes at two ends of crankshaft |
-
2020
- 2020-11-04 CN CN202022519574.3U patent/CN214161416U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112222431A (en) * | 2020-11-04 | 2021-01-15 | 宁夏宏源长城机床有限公司 | Special fixture for milling key groove planes at two ends of crankshaft |
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