A lathe fixture for precision machining of mixed lines

Abstract

This utility model relates to the field of lathe fixture technology, specifically a lathe fixture for precision machining of mixed lines, comprising: a six-jaw chuck, the six-jaw chuck being fixed on a lathe, the surface of the six-jaw chuck having several sets of sliding grooves, a slider being slidably connected in the sliding grooves, a fan-shaped chuck being fixed on the surface of the slider, and the surface of the fan-shaped chuck having several sets of fan-shaped steps, the diameters of the fan-shaped steps being different; the beneficial effect is that: the fan-shaped chuck of this application has several sets of fan-shaped steps, and by selecting the appropriate fan-shaped steps according to the specifications of the car wheel hub for clamping, it is possible to clamp car wheel hubs of different specifications without changing the lathe fixture, thereby greatly improving efficiency when precision machining of car wheel hubs of different specifications.

Description

Technical Field

[0001] This utility model relates to the field of lathe fixtures, specifically a lathe fixture for precision machining of mixed lines. Background Technology

[0002] "Precision machining mixed line" is an advanced manufacturing model that integrates precision machining (precision machining) and flexible production technology (mixed line) in the manufacturing industry. It aims to complete the processing of multiple varieties and specifications of workpieces efficiently and with high precision on the same production line. When performing static machining mixed line, lathe fixtures are required to hold the workpieces.

[0003] In the prior art, patent application CN201620411534.8 discloses a lathe fixture, including a chuck and connecting blocks. Several connecting blocks are mounted on the chuck. The connecting blocks are provided with clamping arms for clamping parts. The clamping arms are integrally formed by a clamping part, a supporting part, and a connecting part in sequence. The supporting part, the connecting part, and the connecting blocks together form a machining cavity. The connecting part is connected to the connecting blocks. The clamping part is provided with a clamping mechanism for clamping the workpiece. The workpiece is clamped in the clamping part by the clamping mechanism. The cutting tool can be inserted into the machining cavity in the clamping arm to machine the inner surface of the workpiece, so that the workpiece can be machined with multiple inner and outer machining surfaces without having to be removed from the fixture multiple times.

[0004] However, when applying existing lathe fixtures to the precision turning and mixed machining of automobile wheel hubs, they can only clamp one type of automobile wheel hub. When clamping other types of automobile wheel hubs, the lathe fixtures need to be replaced, which seriously affects the machining efficiency of the precision turning and mixed machining of automobile wheel hubs. Utility Model Content

[0005] The purpose of this invention is to provide a lathe fixture for precision machining of mixed lines, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a lathe fixture for precision machining of mixed lines, comprising: a six-jaw chuck, the six-jaw chuck being fixed on the lathe, the surface of the six-jaw chuck being provided with several sets of sliding grooves, a slider being slidably connected in the sliding grooves, a fan-shaped chuck being fixed on the surface of the slider, and the surface of the fan-shaped chuck being provided with several sets of fan-shaped steps, the diameters of the several sets of fan-shaped steps being different.

[0007] Preferably, a push plate is movably inserted into the six-jaw chuck, and a drive shaft is fixed on the push plate. The push plate has a frustum structure.

[0008] Preferably, the push plate has an inclined groove on its surface, and an inclined slider is fixed on the surface of the slider. The inclined slider is movably inserted into the inclined groove, and the inclined slider cooperates with the inclined groove.

[0009] Preferably, a device base is fixed on the surface of the six-jaw chuck. The device base has a rectangular box structure, and a balance block is slidably connected in the device base.

[0010] Preferably, the balance block has a rectangular block structure, a first pin groove is formed on the surface of the balance block, and a second pin groove is formed on the surface of the slider.

[0011] Preferably, a mounting shaft is fixed on the inner wall of the device base, and a pin is rotatably connected to the mounting shaft. One end of the pin is movably inserted into the first pin groove, and the other end of the pin is movably inserted into the second pin groove. The distance from the end of the pin inserted into the first pin groove to the center line of the six-jaw chuck is greater than the distance from the end of the pin inserted into the second pin groove to the center line of the six-jaw chuck.

[0012] Compared with the prior art, the beneficial effects of this utility model are: This utility model proposes a lathe fixture for precision machining of mixed-line machining. The drive shaft, with its end furthest from the push plate, is mounted on a hydraulic tappet mechanism of the lathe. The car wheel hub is placed between several sets of sector-shaped chucks. The hydraulic rods of the hydraulic tappet mechanism extend, pushing the drive shaft. The drive shaft then pushes the push plate, causing the inclined slide block to gradually and completely insert into the inclined groove. The inclined groove and the inclined slide block are inclined. As the inclined slide block is fully inserted into the inclined groove, it moves towards the center line of the six-jaw chuck. Once fully inserted, the car wheel hub is clamped by the inner wall of the sector-shaped steps, allowing for precision machining of the car wheel hub on the lathe. The sector-shaped chucks in this application have several sets of sector-shaped steps. By selecting the appropriate sector-shaped steps according to the specifications of the car wheel hub, different specifications of car wheel hubs can be clamped without changing the lathe fixture, thus greatly improving efficiency when performing precision machining of different specifications of car wheel hubs. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic cross-sectional view of the present invention. Figure 3 This is a schematic diagram of the push plate structure; Figure 4 This is a schematic diagram of the slider structure; Figure 5 This is a schematic diagram of the cross-sectional structure of the device base; Figure 6 for Figure 5 Enlarged schematic diagram of the structure at point A in the middle.

[0014] In the diagram: 1. Six-jaw chuck; 2. Slide groove; 3. Slider; 4. Drive shaft; 5. Fan-shaped chuck; 6. Fan-shaped step; 7. Push plate; 8. Inclined slide groove; 9. Inclined slider; 10. Device seat; 11. Balance block; 12. First pin groove; 13. Second pin groove; 14. Mounting shaft; 15. Pin. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0016] Example 1: Please refer to Figures 1-6 This utility model provides a technical solution: a lathe fixture for precision machining of mixed lines, comprising: a six-jaw chuck 1, the six-jaw chuck 1 being fixed on the lathe, the surface of the six-jaw chuck 1 having several sets of sliding grooves 2, a slider 3 being slidably connected in the sliding grooves 2, a fan-shaped chuck 5 being fixed on the surface of the slider 3, the surface of the fan-shaped chuck 5 having several sets of fan-shaped steps 6, the diameters of the several sets of fan-shaped steps 6 being different, a push plate 7 being movably inserted into the six-jaw chuck 1, a drive shaft 4 being fixed on the push plate 7, the push plate 7 having a frustum structure, the surface of the push plate 7 having an oblique sliding groove 8, an oblique slider 9 being fixed on the surface of the slider 3, the oblique slider 9 being movably inserted into the oblique sliding groove 8, the oblique slider 9 cooperating with the oblique sliding groove 8.

[0017] In actual use, the end of the drive shaft 4 away from the push plate 7 is mounted on the hydraulic tappet mechanism of the lathe. The car wheel hub is placed between several sets of sector chucks 5. The hydraulic rod of the hydraulic tappet mechanism extends, pushing the drive shaft 4. The drive shaft 4 then pushes the push plate 7, causing the inclined slide block 9 to gradually and completely insert into the inclined slide groove 8. The inclined slide groove 8 and the inclined slide block 9 are set at an angle. As the inclined slide block 9 is fully inserted into the inclined slide groove 8, the slide block 3 moves in the slide groove 2 towards the center line of the six-jaw chuck 1. When the inclined slide block 9 is fully inserted into the inclined slide groove 8, the car wheel hub is clamped by the inner wall of the sector step 6. Then, the lathe can be used to perform precision machining on the car wheel hub. The sector chuck 5 in this application has several sets of sector steps 6. According to the specifications of the car wheel hub, the appropriate sector step 6 is selected for clamping, so that car wheel hubs of different specifications can be clamped without changing the lathe fixture. This greatly improves the efficiency when performing precision machining on car wheel hubs of different specifications.

[0018] Example 2: Based on Example 1, in order to achieve more stable clamping of the car wheel hub, a device seat 10 is fixed on the surface of the six-jaw chuck 1. The device seat 10 has a rectangular box structure. A balance block 11 is slidably connected in the device seat 10. The balance block 11 has a rectangular block structure. A first pin groove 12 is opened on the surface of the balance block 11. A second pin groove 13 is opened on the surface of the slider 3. A mounting shaft 14 is fixed on the inner wall of the device seat 10. A pin 15 is rotatably connected to the mounting shaft 14. One end of the pin 15 is movably inserted into the first pin groove 12, and the other end of the pin 15 is movably inserted into the second pin groove 13. The distance from the end of the pin 15 inserted into the first pin groove 12 to the center line of the six-jaw chuck 1 is greater than the distance from the end of the pin 15 extended into the second pin groove 13 to the center line of the six-jaw chuck 1.

[0019] After clamping the car wheel hub, the clamping force is actually provided by the hydraulic tappet mechanism on the lathe. The hydraulic rod of the car tappet mechanism presses against the drive shaft 4, and the drive shaft 4 presses against the push plate 7, preventing the inclined slide block 9 from exiting the inclined slide groove 8. This prevents the slide block 3 from moving away from the center line of the six-jaw chuck 1, thereby achieving the clamping of the car wheel hub by the fan-shaped step 6 on the fan-shaped chuck 5. However, in actual application, when the external force applied to the hydraulic rod is large enough, the hydraulic oil in the hydraulic tappet mechanism can be compressed, which causes the hydraulic rod to retract slightly into the cylinder due to the external force. When the wheel hub is clamped using a lathe fixture and precision machined, the lathe tool rests against the machining surface. The lathe motor drives the hydraulic tappet mechanism to rotate, which in turn drives the six-jaw chuck 1 to rotate via the drive shaft 4 and push plate 7. As the six-jaw chuck 1 rotates at high speed, the slide groove 2 follows suit, generating significant centrifugal force. To reduce wear between the inner wall of the inclined slide groove 8 and the inclined slide block 9, both surfaces are very smooth, resulting in minimal friction between them. Therefore, the centrifugal force of the slide groove 2 is effectively neutralized. Limited force means that the centrifugal force of the slide 2 is transmitted to the hydraulic rod of the hydraulic tappet mechanism through the push plate 7 and drive shaft 4. If the force transmitted to the hydraulic rod is too large, it will cause the hydraulic rod to retract into the hydraulic cylinder, thereby causing the drive shaft 4 and push plate 7 to move away from the six-jaw chuck 1, and the slide 2 to move away from the center line of the six-jaw chuck 1, resulting in the loosening of the clamping of the car wheel hub. To avoid this phenomenon, a device seat 10 is fixed on the six-jaw chuck 1, and a balance block 11 is set in the device seat 10. When the six-jaw chuck 1 rotates at high speed, the balance block 11 also rotates at high speed, and the balance block 11 also generates centrifugal force in a directional direction. The tendency to move away from the centerline of the six-jaw chuck 1 is addressed by fixing a shaft 14 in the mounting base 10. The shaft 14 is inserted into the middle part of a pin 15. One end of the pin 15 is inserted into the first pin groove 12 on the balance block 11, and the other end is inserted into the second pin groove 13 on the surface of the slider 3. The centrifugal forces of the balance block 11 and the slider 3 act on both ends of the pin 15, both moving away from the centerline of the six-jaw chuck 1. Under the action of the lever principle, the centrifugal force of the balance block 11 cancels out the centrifugal force of the slider 3. Furthermore, according to the formula F=mω 2Given rF: centrifugal force, m: mass of the object, ω: angular velocity of rotation, and r: radius of rotation, it can be seen that when the balance block 11 and the slider 3 have the same mass, the distance from the end of the pin 15 inserted into the first pin groove 12 to the center line of the six-jaw chuck 1 is greater than the distance from the end of the pin 15 inserted into the second pin groove 13 to the center line of the six-jaw chuck 1. Therefore, the centrifugal force of the balance block 11 acting on one end of the pin 15 is greater than the centrifugal force of the slider 3 acting on the other end of the pin 15. Thus, it not only completely cancels out the centrifugal force of the slider 3, but also applies a force close to the center line of the six-jaw chuck 1 to the slider 3. After this force is transmitted to the sector chuck 5, it can further increase the clamping force of the sector step 6 on the sector chuck 5 on the car wheel hub, making the clamping of the car wheel hub more stable.

[0020] In actual use, the end of the drive shaft 4 furthest from the push plate 7 is mounted on the hydraulic tappet mechanism of the lathe. The car wheel hub is placed between several sets of fan-shaped chucks 5. The hydraulic rods of the hydraulic tappet mechanism extend, pushing the drive shaft 4. The drive shaft 4 then pushes the push plate 7, causing the inclined slide block 9 to gradually and completely insert into the inclined groove 8. The inclined groove 8 and the inclined slide block 9 are inclined. As the inclined slide block 9 is fully inserted into the inclined groove 8, the slide block 3 moves in the groove 2 towards the center line of the six-jaw chuck 1. When the inclined slide block 9 is fully inserted into the inclined groove 8, the car wheel hub is clamped by the inner wall of the fan-shaped step 6, and then the lathe can be used to perform precision machining on the car wheel hub. The fan-shaped chuck 5 has several sets of fan-shaped steps 6. By selecting the appropriate fan-shaped step 6 according to the specifications of the car wheel hub, different specifications of car wheel hubs can be clamped without changing the lathe fixture. This greatly improves efficiency when performing precision machining of different specifications of car wheel hubs. After clamping the car wheel hub, the clamping force is actually provided by the hydraulic tappet mechanism on the lathe. The hydraulic rod of the car tappet mechanism pushes against the drive shaft 4, and the drive shaft 4 pushes against the push plate 7, preventing the inclined slide block 9 from exiting the inclined slide groove 8. This prevents the slide block 3 from moving away from the center line of the six-jaw chuck 1. This allows the fan-shaped steps 6 on the fan-shaped chuck 5 to clamp the car wheel hub; however, in practical applications, when the external force applied to the hydraulic rod is large enough, the hydraulic oil in the hydraulic tappet mechanism can be compressed, which causes the hydraulic rod to retract slightly into the cylinder due to the external force; when using a lathe fixture to clamp the wheel hub and perform precision machining, the cutting tool on the lathe rests against the machining surface, and then the motor on the lathe drives the hydraulic tappet mechanism to rotate. The hydraulic tappet mechanism then drives the six-jaw chuck 1 to rotate through the drive shaft 4 and the push plate 7. When the six-jaw chuck 1 rotates at high speed, the slide groove 2 follows the high-speed rotation of the six-jaw chuck 1 to produce... The centrifugal force is relatively large. In order to reduce the wear between the inner wall of the inclined slide 8 and the inclined slider 9, the inner wall of the inclined slide 8 and the surface of the inclined slider 9 are very smooth, resulting in very small friction between the inclined slide 8 and the inclined slider 9. Therefore, the offsetting effect on the centrifugal force of the slide 2 is very limited. This causes the centrifugal force of the slide 2 to be transmitted to the hydraulic rod of the hydraulic tappet mechanism through the push plate 7 and the drive shaft 4. If the force transmitted to the hydraulic rod is too large, it will cause the hydraulic rod to retract into the hydraulic cylinder, which will cause the drive shaft 4 and the push plate 7 to move away from the six-jaw chuck 1, and the slide 2 to move away from the center line of the six-jaw chuck 1, resulting in the loosening of the clamping of the car wheel hub.To avoid this phenomenon, a mounting base 10 is fixed on the six-jaw chuck 1, and a balance block 11 is installed in the mounting base 10. When the six-jaw chuck 1 rotates at high speed, the balance block 11 also rotates at high speed, and the balance block 11 also generates centrifugal force, tending to move away from the center line of the six-jaw chuck 1. A mounting shaft 14 is fixed in the mounting base 10, and the mounting shaft 14 is inserted into the middle part of the pin 15. One end of the pin 15 is inserted into the first pin groove 12 opened on the balance block 11, and the other part of the pin 15 is inserted into the second pin groove 13 opened on the surface of the slider 3. The centrifugal forces of the balance block 11 and the slider 3 act on both ends of the pin 15 respectively, and both are directed away from the center line of the six-jaw chuck 1. Under the action of the lever principle, the centrifugal force of the balance block 11 cancels out the centrifugal force of the slider 3; and... According to the formula F=mω²r, where F is centrifugal force, m is the mass of the object, ω is the angular velocity of rotation, and r is the radius of rotation, when the balance block 11 and the slider 3 have the same mass, the distance from the end of the pin 15 inserted into the first pin slot 12 to the center line of the six-jaw chuck 1 is greater than the distance from the end of the pin 15 inserted into the second pin slot 13 to the center line of the six-jaw chuck 1. Therefore, the centrifugal force of the balance block 11 acting on one end of the pin 15 is greater than the centrifugal force of the slider 3 acting on the other end of the pin 15. This not only completely cancels out the centrifugal force of the slider 3 but also applies a force close to the center line of the six-jaw chuck 1 to the slider 3. This force, after being transmitted to the sector chuck 5, further increases the clamping force of the sector step 6 on the sector chuck 5 on the car wheel hub, making the clamping of the car wheel hub more stable.

[0021] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A lathe fixture for precision machining of mixed lines, comprising: A six-jaw chuck (1) is fixed on a lathe. The six-jaw chuck (1) has several sets of sliding grooves (2) on its surface. A slider (3) is slidably connected in the sliding groove (2). A fan-shaped chuck (5) is fixed on the surface of the slider (3). Several sets of fan-shaped steps (6) are provided on the surface of the fan-shaped chuck (5). The diameters of the several sets of fan-shaped steps (6) are different.

2. A lathe fixture for finish machining of mixed lines as claimed in claim 1, wherein: A push plate (7) is movably inserted into the six-jaw chuck (1), and a drive shaft (4) is fixed on the push plate (7). The push plate (7) has a frustum structure.

3. A lathe fixture for finish machining of mixed runs as claimed in claim 2, wherein: The push plate (7) has an inclined groove (8) on its surface, and the slider (3) has an inclined slider (9) fixed on its surface. The inclined slider (9) is movably inserted into the inclined groove (8), and the inclined slider (9) cooperates with the inclined groove (8).

4. A lathe fixture for finish machining of mixed runs as claimed in claim 1, wherein: The six-jaw chuck (1) has a device seat (10) fixed on its surface. The device seat (10) has a rectangular box structure and a balance block (11) is slidably connected in the device seat (10).

5. A lathe fixture for finish machining of mixed runs as claimed in claim 4, wherein: The balance block (11) has a rectangular block structure. A first pin groove (12) is provided on the surface of the balance block (11), and a second pin groove (13) is provided on the surface of the slider (3).

6. A lathe fixture for finish machining of mixed runs as claimed in claim 5 wherein: A mounting shaft (14) is fixed on the inner wall of the device base (10). A pin (15) is rotatably connected to the mounting shaft (14). One end of the pin (15) is movably inserted into the first pin groove (12), and the other end of the pin (15) is movably inserted into the second pin groove (13). The distance from the end of the pin (15) inserted into the first pin groove (12) to the center line of the six-jaw chuck (1) is greater than the distance from the end of the pin (15) inserted into the second pin groove (13) to the center line of the six-jaw chuck (1).

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