A differential tooling fixture

Abstract

The present application relates to differential processing equipment technical field, especially to a differential tooling fixture, including clamping unit and turnover unit. Clamping unit includes telescopic device and chuck, telescopic device can adjust the axial position of chuck; Turnover unit includes linear guide, feeding mechanism and two turnover devices; Two turnover devices are slidingly connected on linear guide, position is adjusted by feeding mechanism; Two turnover devices are provided with power output shaft, power output shaft is provided with internal expansion chuck and boring cutter. The differential tooling fixture can turn over the differential housing, the positioning reference is consistent in the clamping process, and the repeated clamping error can be reduced, and the machining precision of the differential housing is significantly improved. The differential tooling fixture can automatically complete the turnover operation of the differential housing, and can finish the finishing treatment of the hole wall of the planetary gear shaft hole, and the machining efficiency of the differential housing is high; It has good applicability to machine tool types and differential specifications.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of differential machining equipment, and particularly relates to a differential tooling fixture. BACKGROUND

[0002] The differential housing is a core component for ensuring the stability and reliability of differential transmission performance, and has extremely high requirements for the shape and position accuracy and surface quality of key parts. The differential housing is a box structure, and the machining parts involve multiple planes and curved surfaces distributed inside and outside. The turning process is very complex and needs to be processed in multiple sequences. When the traditional fixture is used for processing the differential housing in multiple sequences, the overturning clamping operation needs to be performed multiple times. Since the positioning references of each process are difficult to unify (for example, the outer circle positioning is used for rough machining, and the center hole positioning is used for fine machining), and the traditional fixture itself has a large repeated clamping error, the positioning deviation is accumulated among multiple processes, and finally the machining accuracy of the differential housing is reduced.

[0003] The special tooling fixture can effectively reduce the accumulation of repeated clamping errors, thereby improving the machining accuracy of the differential housing, but has poor adaptability, high investment cost, long model switching period, and insufficient compatibility with the automatic production line, and is difficult to adapt to the technical requirements of rapid updating, diversification of models and fine machining of the differential housing product. SUMMARY

[0004] In order to overcome the shortcomings of the prior art, the present application provides a differential tooling fixture. The differential tooling fixture is suitable for rough turning and fine turning of the differential housing, can overturn the differential housing during clamping according to the process requirements, the positioning system does not change substantially during the overturning process, and the repeated clamping error can be reduced, so that the machining accuracy of the differential housing can be significantly improved.

[0005] In order to achieve the above technical purpose, the present application adopts the following technical scheme:

[0006] A differential tooling fixture, comprising a clamping unit and an overturning unit;

[0007] The clamping unit comprises a telescopic device and a chuck. The telescopic device is provided with a driving mechanism and can be telescoped in the front-back direction. The front end is fixedly connected with the chuck, and the rear end is provided with a connecting part for connecting with the main shaft of the machine tool. The chuck is a front-mounted self-centering chuck;

[0008] The turnover unit comprises a linear guide rail, a feeding mechanism and two turnover devices; the linear guide rail is horizontally placed and located at the front side of the clamping unit, and the extending direction is perpendicular to the central axis of the chuck; the two turnover devices are slidingly connected to the linear guide rail and the positions are adjusted by the feeding mechanism; the opposite sides of the two turnover devices are respectively provided with a horizontally extending power output shaft, and a motor device for driving the power output shaft to rotate is arranged in the turnover device, and the motor device can control the rotating speed and angle of the power output shaft; the central axes of the two power output shafts coincide and are both perpendicular to the central axis of the chuck; the opposite ends of the two power output shafts are respectively provided with an internal expansion chuck, and a boring cutter is arranged on the shaft body of the power output shaft.

[0009] In the preferred embodiment, the telescopic device comprises an outer cylinder, an inner cylinder and a first rotary joint; the inner part of the outer cylinder is provided with a piston cavity with a closed rear end, an end cover is fixed to the front end of the outer cylinder and the two are sealingly matched, and a circular hole is formed in the end cover; the connecting part is fixed to the rear end of the outer cylinder; the inner cylinder is in the shape of a cylinder, passes through the circular hole of the end cover in a sealing sliding fit, and the rear end of the inner cylinder is fixedly connected with a piston; two oil channels are formed in the cylinder wall of the outer cylinder and communicate with the front and rear ends of the piston cavity respectively; the first rotary joint is sleeved on the outer cylinder and is provided with two oil inlet and outlet ports which are in communication with the two oil channels respectively; the rear end of the piston cavity is fixedly provided with a forwardly extending guide core which extends into the inner cavity of the inner cylinder in a sliding fit.

[0010] Further, the first rotary joint is fixedly connected with a support which is fixedly mounted on the machine tool body.

[0011] Further, the end cover and the outer cylinder are fixedly connected by bolts.

[0012] In the preferred embodiment, the chuck is a front-mounted pneumatic chuck.

[0013] In the preferred embodiment, the internal expansion chuck is a pneumatic chuck, and a gas channel is formed in the power output shaft to provide gas pressure for the pneumatic chuck; a second rotary joint is sleeved on the power output shaft, the two are rotationally connected and sealingly matched, and the second rotary joint is provided with a gas inlet and outlet hole in communication with the gas channel;

[0014] Further, the second rotary joint is fixedly connected with the main part of the turnover device.

[0015] In the preferred embodiment, the two turnover devices are installed below the linear guide rail.

[0016] In the preferred embodiment, the boring cutter is provided with a plurality of boring cutters which are fixedly installed on the shaft body of the power output shaft and are spaced apart along the axial direction.

[0017] In a preferred embodiment, the feeding mechanism includes a drive motor and a lead screw connected by transmission. The lead screw has two threaded sections with opposite directions of rotation of the threads in the two threaded sections. Each of the two flipping devices is fixedly connected to a screw sleeve, and the two screw sleeves are threadedly engaged with the two threaded sections respectively. During the rotation of the lead screw, the two flipping devices move synchronously in opposite directions and are always symmetrically distributed about the central axis of the chuck.

[0018] Compared with the prior art, the differential tooling fixture of the present invention has the following beneficial technical effects:

[0019] 1. When clamping the differential housing, this differential tooling fixture can flip the differential housing according to the process requirements. The positioning reference used in the clamping process of different processes is essentially the same. Through the coaxial cooperation of the internal expansion chuck and the boring tool, the repeated clamping error can be greatly reduced. Based on the above measures, the dimensional accuracy and surface quality of the differential housing machining can be significantly improved.

[0020] 2. When clamping the differential housing, this differential tooling fixture can automatically complete the flipping operation of the differential housing by using the flipping device, and can also perform precision machining on the hole wall of the planetary gear shaft hole, thereby significantly improving the machining efficiency of the differential housing.

[0021] 3. This differential tooling fixture adopts a scientific and reasonable structural design, which is well applicable to machine tool models and differential specifications, easy to implement and has broad application prospects. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention.

[0023] Figure 1 This is a schematic diagram of the overall structure of the differential tooling fixture in the embodiment.

[0024] Figure 2 This is a schematic diagram of the telescopic device in the embodiment.

[0025] Figure 3 This is a schematic diagram of the structure of the telescopic device after partial cross-section in the embodiment.

[0026] Figure 4 This is a schematic diagram of the extended state of the telescopic device in the embodiment.

[0027] Figure 5 This is a schematic diagram of the structure of the flipping device and the linear guide rail in the embodiment.

[0028] Figure 6 This is a schematic diagram of the structure of the power output shaft after partial cross-section in the embodiment.

[0029] Figure 7 This is a schematic diagram showing the installation and positioning of the differential housing.

[0030] Figure 8 A schematic diagram of the clamping state when the chuck clamps and fixes the journal at one end of the differential housing.

[0031] Figure 9 This is a schematic diagram showing the state of the planetary gear shaft hole being bored using a boring tool by a flipping device.

[0032] Figure 10 This is a schematic diagram showing the state of the differential housing when the flipping device flips it.

[0033] Figure 11 This is a schematic diagram of the clamping state when the chuck clamps and fixes the journal at the other end of the differential housing.

[0034] Figure 12 This is a schematic diagram of the mating structure between the first rotary joint and the support.

[0035] Figure 13 This is a schematic diagram showing the engagement state when the linear guide rail is located on the upper side of the flipping device.

[0036] Figure 14 This is a schematic diagram of the internal structure of a linear guide rail.

[0037] In the diagram: 1. Power output shaft, 2. Linear guide rail, 3. Internal expansion chuck, 4. Claw, 5. Chuck, 6. Telescopic device, 601. Connecting part, 602. Outer cylinder, 603. First rotary joint, 604. Chuck seat, 605. End cover, 606. Inner cylinder, 607. Oil inlet / outlet, 608. Piston, 609. Guide core, 610. Piston chamber, 611. Oil passage, 7. Tilting device, 8. Drive motor, 9. Boring tool, 10. Second rotary joint, 11. Air inlet / outlet, 12. Air passage, 13. Journal, 14. Support, 15. Screw sleeve, 16. Lead screw, 17. Threaded section. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the described embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0039] See Figures 1-6 As shown in the figure, the embodiment discloses a differential tooling fixture, which consists of a clamping unit and a flipping unit that work in coordination.

[0040] The clamping unit includes a telescopic device 6 and a chuck 5. The telescopic device 6 can extend and retract in the front-to-back direction and has an internal drive mechanism to adjust its extension and retraction. The front end of the telescopic device 6 has a chuck seat 604, which is fixedly connected to the chuck 5 to provide support for the chuck 5. The rear end of the telescopic device 6 has a connecting part 601 for fixed connection with the front end of the machine tool spindle. After the telescopic device 6 is fixedly connected to the front end of the machine tool spindle via the connecting part 601, the central axes of the chuck 5 and the spindle coincide. The chuck 5 is used to clamp the journal 13 at the end of the differential housing. The chuck 5 is a front-mounted self-centering chuck. Because the front-mounted self-centering chuck integrates a drive system that provides drive for the jaws 4, it does not need to be connected to the drive components such as the tie rod inside the machine tool spindle. This allows the chuck 5 to maintain its clamping function as the telescopic device 6 moves.

[0041] The flipping unit is used to flip and adjust the differential housing, including a linear guide rail 2, a feed mechanism, and two flipping devices 7. The linear guide rail 2 is placed horizontally and located in front of the clamping unit, with its extension direction perpendicular to the central axis of the chuck 5. The two flipping devices 7 are mounted on the linear guide rail 2 and are driven by the feed mechanism to slide along the linear guide rail 2 to adjust their position. Each of the two flipping devices 7 has a horizontally extending power output shaft 1 on its opposite side. The flipping device 7 has a motor device inside, which drives the power output shaft 1 to rotate and can control the speed and angle of the power output shaft 1. The central axes of the two power output shafts 1 coincide and are both perpendicular to the central axis of the chuck 5. The opposite ends of the two power output shafts 1 are respectively equipped with internal expansion chucks 3, which have a self-centering function and match the planetary gear shaft holes of the differential housing. A boring tool 9 is mounted on the shaft of the power output shaft 1. The boring tool 9 is used to bore the planetary gear shaft holes to improve the shape and position accuracy and surface quality of the planetary gear shaft holes.

[0042] This differential tooling fixture is suitable for the roughing and finishing processes of the differential housing. Its specific working method and principle are as follows:

[0043] 1. Installation and positioning of the differential housing.

[0044] See Figure 7 , Figure 8As shown, according to the design dimensions of the differential housing, the front and rear positions of the chuck 5 are adjusted using the telescopic device 6. The journal 13 at one end of the differential housing to be processed is placed inside the chuck 5. The positions of the two tilting devices 7 on the linear guide 2 are adjusted so that the two inner expansion chucks 3 respectively enter the interiors of the two planetary gear shaft holes. The chuck 5 and the two inner expansion chucks 3 simultaneously clamp the differential housing. Based on the vertical distribution characteristics of the two inner expansion chucks 3 and the chuck 5, and their self-centering function, the differential housing can be precisely positioned during the gradual clamping process. Afterward, the inner expansion chucks 3 will return to their retracted state, and the two tilting devices 7... Moving along the linear guide 2, it gradually moves away from the differential housing to make room for the turning mechanism such as the tool post and turret. At this time, the journal 13 at one end of the differential housing is clamped and fixed by the chuck 5 and can rotate with the spindle, meeting the clamping state required for the turning process. In this clamping state, the circular and end faces of the other journal 13 and the flange and other components can be turned using current turning technology. The inner spherical surface can also be turned using a gooseneck cutter. It is worth noting that in this turning process, it is necessary to process the relevant circular and end faces of the unclamped journal 13 to provide conditions for subsequent clamping.

[0045] 2. Flipping the differential housing.

[0046] See Figures 9-11 As shown, as a pre-processing step before the flipping action, the two planetary gear shaft holes of the differential housing are first bored to improve the dimensional accuracy and surface quality. Specifically, the two flipping devices 7 drive the power output shaft 1 to run at a higher speed. The feed mechanism adjusts the position of the two flipping devices 7 on the linear guide 2 to adjust the feed amount of the boring tool 9, and the hole walls of the two planetary gear shaft holes are bored respectively. This step can also be completed before the first turning. After the pre-processing is completed, the two flipping devices 7 move to a new position, allowing the two internal expansion chucks 3 to re-enter the interior of the two planetary gear shaft holes and clamp them. The chuck 5 is adjusted to the open state and driven by the telescopic device 6 to move backward, separating from the journal 13 and freeing up the space required for the differential housing to flip. The two flipping devices 7 drive the two power output shafts 1 to rotate synchronously by 180 degrees. The journal 13, which has now been machined, is now aligned with the chuck 5. The telescopic device 6 drives the chuck 5 to move forward and clamps the corresponding journal 13. The internal expansion chucks 3 return to the retracted state, and the two flipping devices 7 move along the linear guide 2, moving away from the differential housing to free up operating space for the tool holder, turret, and other turning mechanisms. At this point, the differential housing is flipped. The machined journal 13 of the differential housing is held by the chuck 5 and can rotate with the spindle, meeting the clamping requirements of the turning process. Using current turning technology, the remaining parts are machined.

[0047] When this differential fixture clamps the differential housing, the chuck 5 and the two internal expansion collets 3 engage with the cross shaft holes of the differential housing, achieving precise positioning based on a three-pin method. During turning, the clamping state of the differential housing can be flipped and adjusted according to process requirements. During the flipping process, the differential housing rotates 180 degrees around the central axis of the power output shaft 1, causing the reference system to change 180 degrees in the direction of the central axis of the power output shaft 1. No other substantial changes occur, ensuring that the positioning reference used in the two clamping processes is substantially consistent. The control system, through corresponding coordinate adjustments, can complete subsequent machining operations based on a unified reference system, thereby significantly reducing the error accumulation caused by reference conversion and improving machining accuracy.

[0048] Meanwhile, as a pre-processing step, the planetary gear shaft holes are pre-bored before the differential housing is flipped, which can significantly improve the shape and position accuracy and surface quality of the planetary gear shaft holes. In addition, the internal expansion chuck 3 and the boring tool 9 are fixed together on the power output shaft 1, so that the relative position of the differential housing and the power output shaft 1 will not change during the process of the internal expansion chuck 3 clamping the precision-machined planetary gear shaft holes. This significantly reduces the repeated clamping error and further improves the machining accuracy of the differential housing.

[0049] When this differential tooling fixture clamps the differential housing, the positioning references are essentially consistent and the repeated clamping error is small, which can significantly improve the dimensional accuracy and surface quality of the differential housing machining. At the same time, the flipping device 7 can automatically complete the flipping operation of the differential housing, saving time and effort, and can perform fine machining on the planetary gear shaft hole wall, thereby significantly improving the machining efficiency of the differential housing.

[0050] This differential gear tooling fixture integrates a telescopic function in its clamping unit, enabling autonomous adjustment of the axial position of the chuck 5. The front-mounted chuck 5 can also autonomously perform clamping actions. When used with a machine tool, only the spindle needs to provide basic rotational power and support, allowing this differential gear tooling fixture to be adapted to various types of machine tools, offering excellent compatibility and ease of implementation. Furthermore, this differential gear tooling fixture is composed of a combination of conventional fixtures such as the universal chuck 5 and the internal expansion collet 3, and adopts a stroke-type design, making it suitable for machining differential housings of various specifications and models. It boasts strong applicability and broad application prospects.

[0051] In this differential tooling fixture, the telescopic device 6 can extend and retract in the front-to-back direction to adjust the axial position of the chuck 5. Based on the aforementioned functions and effects of the telescopic device 6, there are no technical obstacles to its implementation with reference to existing technology, and it has multiple implementation methods. For example, the telescopic device 6 is composed of two sections connected together, and the drive mechanism consists of a power unit and a transmission mechanism, which can drive the two sections of the telescopic device 6 to move relative to each other, thereby realizing the adjustment of the extension amount; since the telescopic device 6 needs to rotate with the main shaft, the power unit can be set up with reference to the installation method of rotary cylinders or rotary motors in existing technology. To improve the ease of implementation and working stability of the telescopic device 6, the present invention provides a preferred embodiment, the specific structure of which is as follows:

[0052] See Figures 2-4 As shown, the telescopic device 6 includes an outer cylinder 602, an inner cylinder 606, and a first rotary joint 603. The outer cylinder 602 has a piston chamber 610 inside, with its rear end closed. An end cap 605 is fixed to the front end of the outer cylinder 602, and the two are sealed together. The end cap 605 has a circular hole, and for ease of assembly, the end cap 605 is bolted to the outer cylinder 602. The connecting part 601 is fixed to the rear end of the outer cylinder 602. The inner cylinder 606 is cylindrical, passing through the circular hole of the end cap 605, and the two are sealed and slidingly fitted together. A piston 608 is fixedly connected to the rear end of the inner cylinder 606, and the piston 608 is sealed and slidingly fitted with the piston chamber 610. Two pistons are formed in the wall of the outer cylinder 602, respectively connected to the front end of the piston chamber 610. The oil passages 611 are connected at both ends; the first rotary joint 603 is sleeved on the outer cylinder 602, and the two are rotatably connected and sealed. Two annular oil grooves are opened on the mating surface of the first rotary joint 603 and the outer cylinder 602. The first rotary joint 603 is provided with two oil inlet and outlet ports 607. The two oil inlet and outlet ports 607 are connected to the two oil passages 611 through the two annular oil grooves respectively. At the same time, the rear end of the piston chamber 610 is fixed with a forward-extending guide core 609. The guide core 609 extends into the inner cavity of the inner cylinder 606 and the two are slidably engaged. The guide core 609 and the inner cylinder 606 can adopt a non-circular mating structure, or a key and keyway mating structure, so that the guide core 609 and the inner cylinder 606 can only move relative to each other in the front-back direction, but cannot rotate relative to each other.

[0053] Thus, piston 608 and piston chamber 610 constitute a driving mechanism, which can drive the outer cylinder 602 and inner cylinder 606 to move relative to each other, thereby driving the telescopic device 6 to extend and retract. Combined with the mature hydraulic control technology in the prior art, the extension and retraction of the telescopic device 6 can be precisely controlled by adjusting the oil flow rate and direction. The guide core 609 is inserted and fitted into the inner cylinder 606, giving the telescopic device 6 good overall strength, which can withstand large torque and radial load, so as to provide stable support for the chuck 5.

[0054] Furthermore, such as Figure 12 As shown, the first rotary joint 603 is fixedly connected to a support 14, which is mounted and fixed on the machine tool body. On the one hand, fixing the first rotary joint 603 helps to improve the stability of the oil circuit connection. On the other hand, the support 14 can provide radial support for the telescopic device 6 based on the first rotary joint 603, further improving the operational stability of the telescopic device 6. Similarly, when the chuck 5 adopts a front-mounted self-centering chuck, it usually also has a corresponding rotary joint, which can also be fixedly connected to the support 14 to achieve the same technical effect as above.

[0055] The chuck 5 in this differential tooling fixture is a front-mounted self-centering chuck. The chuck 5 that meets the above requirements is a very common machine tool accessory product in the prior art. Depending on the power source, it is usually divided into pneumatic and hydraulic types, which can be selected and used according to actual needs. The specific structure and working principle will not be described in detail here. In order to improve the response speed of the chuck 5, preferably, the chuck 5 is a pneumatic front-mounted chuck.

[0056] The internal expansion chuck 3 in this differential gear tooling fixture has a self-centering function. The internal expansion chuck 3, which meets the above requirements, is a very common machine tool accessory product in the prior art. Depending on the power source, it has various structural types, such as pneumatic, hydraulic, and tie-rod types, which can be selected according to actual needs. The specific structure and working principle will not be elaborated here. The preferred embodiment of this invention is:

[0057] See Figure 5 , Figure 6 As shown, the internal expansion chuck 3 is a pneumatic chuck, and the power output shaft 1 has an air passage 12 inside to provide air pressure for the pneumatic chuck; a second rotary joint 10 is sleeved on the power output shaft 1, and the two are rotatably connected and sealed together. An annular air groove is provided on the mating surface of the second rotary joint 10 and the power output shaft 1, and an air inlet and outlet hole 11 is provided on the second rotary joint 10. The air inlet and outlet hole 11 is always connected to the air passage 12 through the annular air groove; in order to ensure the stability of the second rotary joint 10, the second rotary joint 10 can be fixedly connected to the main body of the flipping device 7.

[0058] like Figure 8 , Figure 11 As shown, in this differential gear tooling fixture, the two tilting devices 7 can be installed above the linear guide 2. When using this installation method, since the linear guide 2 is lower than the workpiece, dust prevention performance needs to be carefully considered. This can be achieved by installing a protective cover to prevent dust and metal chips generated during workpiece machining from entering the linear guide 2 and affecting its performance. Furthermore, as... Figure 13As shown, the two flipping devices 7 can also be installed below the linear guide rail 2. When this installation method is adopted, the position of the linear guide rail 2 is higher than the workpiece, so that dust and metal chips during the workpiece processing are less likely to enter the linear guide rail 2, making the performance of the linear guide rail 2 more stable.

[0059] In this differential gear tooling fixture, the feed mechanism is used to adjust the position of the two tilting devices 7 on the guide rail. Based on this purpose, the feed mechanism can employ two commonly used linear drive mechanisms in the prior art to drive and control the two tilting devices 7 respectively. This invention provides a preferred embodiment, the specific structure of which is as follows:

[0060] See Figure 1 , Figure 14 As shown, the feeding mechanism includes a drive motor 8 and a lead screw 16 connected by a transmission connection; the lead screw 16 is rotatably fixed inside the linear guide rail 2 and both extend in the same direction; the lead screw 16 is provided with two threaded sections 17, and the threads in the two threaded sections 17 have opposite directions of rotation; each of the two flipping devices 7 is fixedly connected with a screw sleeve 15, and the two screw sleeves 15 are respectively threadedly engaged with the two threaded sections 17; during the rotation of the lead screw 16, the two flipping devices 7 move synchronously in opposite directions and are always symmetrically distributed about the central axis of the chuck 5;

[0061] Based on this design, on the one hand, the two flipping devices 7 are driven by the drive motor 8 and the lead screw 16, which can significantly simplify the structure and reduce the energy consumption of operation; on the other hand, when the drive motor 8 is working, the two flipping devices 7 move synchronously in opposite directions and are symmetrically distributed, which makes the position of the flipping devices 7 easy to control and helps to improve the position adjustment accuracy.

[0062] In this differential tooling fixture, the boring bar 9 is mounted on the power output shaft 1 and is used to bore the two planetary gear shaft holes to improve the form and position accuracy of the planetary gear shaft holes. To improve the boring accuracy, multiple boring bars 9 can be set, and multiple boring bars 9 are mounted and fixed on the shaft body of the power output shaft 1 and distributed at intervals along the axial direction. Thus, the hole wall error of the planetary gear shaft holes can be gradually corrected through rough boring, semi-finish boring and finish boring to improve the machining accuracy.

Claims

1. A differential gear tooling fixture, characterized in that: Includes a clamping unit and a flipping unit; The clamping unit includes a telescopic device and a chuck; the telescopic device is equipped with a drive mechanism, which can extend and retract in the front and rear directions, the front end is fixedly connected to the chuck, and the rear end is equipped with a connecting part for connecting to the machine tool spindle; the chuck is a front-mounted self-centering chuck. The flipping unit includes a linear guide rail, a feed mechanism, and two flipping devices. The linear guide rail is horizontally placed and located in front of the clamping unit, extending perpendicularly to the central axis of the chuck. The two flipping devices are slidably connected to the linear guide rail and their positions are adjusted by the feed mechanism. Each of the two flipping devices has a horizontally extending power output shaft on its opposite side. The flipping device contains a motor for driving the power output shaft to rotate, and the motor can control the speed and angle of the power output shaft. The central axes of the two power output shafts coincide and are both perpendicular to the central axis of the chuck. Internal expansion chucks are installed at the opposite ends of the two power output shafts, and boring tools are installed on the shafts of the two power output shafts.

2. The differential tooling fixture according to claim 1, characterized in that: The telescopic device includes an outer cylinder, an inner cylinder, and a first rotary joint; the outer cylinder has a piston chamber with a closed rear end, and an end cap is fixed to the front end of the outer cylinder and the two are sealed together, with a round hole on the end cap; the inner cylinder is cylindrical, passes through the round hole of the end cap, and the two are sealed and slidably connected, with a piston fixedly connected to the rear end of the inner cylinder; two oil passages are opened in the wall of the outer cylinder, which are respectively connected to the front and rear ends of the piston chamber; the first rotary joint is sleeved on the outer cylinder and has two oil inlet and outlet ports that are respectively connected to the two oil passages; a guide core is fixed to the rear end of the piston chamber, and the guide core extends into the inner cavity of the inner cylinder and the two are slidably connected.

3. The differential tooling fixture according to claim 2, characterized in that: The first rotary joint is fixedly connected to a support, which is mounted and fixed on the machine tool body.

4. The differential tooling fixture according to claim 2, characterized in that: The end cap and the outer cylinder are fixedly connected by bolts.

5. The differential tooling fixture according to claim 1, characterized in that: The chuck is a pneumatic front-mounted chuck.

6. The differential tooling fixture according to claim 1, characterized in that: The internal expansion chuck is a pneumatic chuck, and an air passage is provided inside the power output shaft; a second rotary joint is sleeved on the power output shaft, and the two are rotatably connected and sealed together, and the second rotary joint is provided with an air inlet and outlet hole that is in communication with the air passage.

7. The differential tooling fixture according to claim 6, characterized in that: The second rotary joint is fixedly connected to the main body of the flipping device.

8. The differential tooling fixture according to claim 1, characterized in that: Two flipping devices are installed below the linear guide rail.

9. The differential tooling fixture according to claim 1, characterized in that: The boring tools are provided in multiple quantities, mounted and fixed on the shaft of the power output shaft, and distributed at intervals along the axial direction.

10. The differential tooling fixture according to claim 1, characterized in that: The feeding mechanism includes a drive motor and a lead screw connected by a transmission. The lead screw has two threaded sections with opposite directions of rotation. Each of the two flipping devices is fixedly connected to a screw sleeve, which is threadedly engaged with the two threaded sections respectively. During the rotation of the lead screw, the two flipping devices move synchronously in opposite directions and are always symmetrically distributed about the central axis of the chuck.

Images