Automatic fixture for milling driven bevel gear integrated structure product

Abstract

This application relates to the field of mechanical tooling and fixture technology, and discloses an automated milling fixture for driven bevel gear integrated structure products. The fixture includes a body, a positioning disk fixedly connected to the left side of the body, a pull shaft slidably passing through the body, a connecting rod and a pull rod sequentially connected to one end of the pull shaft, a cone seat fixedly disposed inside the positioning disk, the pull rod passing through the cone seat, and an expansion sleeve located on the left side of the cone seat fitted around the pull rod. A stop plate is connected to the end of the pull rod away from the connecting rod. The pull rod and the stop plate move synchronously, one side of the stop plate abutting against the end face of the expansion sleeve, and the inner surface of the expansion sleeve fitting onto the outer surface of the cone seat and slidingly engaging with it. This invention solves the problem of insufficient clamping force caused by the use of shaft diameter positioning in existing milling clamping methods, which rely on manual tightening of pressure plates for secondary clamping, resulting in low processing efficiency and unstable positioning and clamping accuracy.

Description

Technical Field

[0001] This invention relates to the field of mechanical tooling and fixture technology, specifically to an automated milling fixture for driven bevel gear integrated structure products. Background Technology

[0002] The drive axle converts the high speed and low torque transmitted by the drive shaft into low speed and high torque through the driving and driven bevel gears inside the reducer, meeting the needs of vehicle starting and heavy load. As drive axles develop towards lightweight, the driven bevel gear has gradually been upgraded to a complex structure integrating the left housing of the differential and the end face teeth. The increased complexity of the part structure makes the manufacturing difficulty of the core milling process more difficult. As a key step in bevel gear forming, the milling process directly determines parameters such as tooth surface imprint and gear accuracy.

[0003] Existing milling processes for integrated driven bevel gears generally rely on manual clamping. Traditional milling fixtures often use shaft diameter positioning and clamping. Due to the small positioning surface of the workpiece and the large extension distance after clamping, this clamping structure is prone to insufficient initial clamping force. To ensure axial stability during machining, operators need to manually tighten the pressure plate for secondary axial clamping and fixation of the workpiece. Manual tightening of the pressure plate increases the operator's workload, slows down the overall machining pace, and the difference in the force applied manually causes fluctuations in the positioning and clamping accuracy of each clamping, ultimately resulting in lower precision of the milled gears. In addition, the spring sleeve structure of existing external clamping fixtures easily creates dead corners inside the fixture. A large amount of milling chips accumulate in these dead corners and are difficult to clean. The remaining chips can raise the workpiece for subsequent machining and damage the positioning reference. The limitations of the clamping transmission structure and the defects in the chip removal design hinder the automation of the driven bevel gear milling process. Therefore, this invention proposes an automated milling fixture for integrated driven bevel gear structures to address the shortcomings of existing technologies. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides an automated milling fixture for driven bevel gear integrated structures, which solves the problems of insufficient clamping force caused by the use of shaft diameter positioning in existing milling clamping modes, resulting in low processing efficiency and unstable positioning and clamping accuracy due to the reliance on manual tightening of pressure plates for secondary clamping and fixing.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an automated milling fixture for driven bevel gear integrated structure products, comprising a body, a positioning disk fixedly connected to the left side of the body, a pull shaft slidably passing through the body, a connecting rod and a pull rod sequentially connected to one end of the pull shaft, a cone seat fixedly disposed inside the positioning disk, the pull rod passing through the inside of the cone seat, and an expansion sleeve located on the left side of the cone seat being sleeved on the outside of the pull rod, and a baffle plate connected to the end of the pull rod away from the connecting rod;

[0006] The pull rod moves synchronously with the baffle, one side of the baffle abuts against the end face of the expansion sleeve, the inner surface of the expansion sleeve is fitted onto the outer surface of the cone seat and slides in cooperation with the outer surface of the cone seat, and the outer circular surface of the expansion sleeve expands radially and abuts against the inner hole of the workpiece.

[0007] The positioning disk has a large flat positioning end face on the side away from the main body. An air passage is opened inside the positioning disk. One end of the air passage extends to the large flat positioning end face and forms an air outlet. The workpiece is driven by the expansion sleeve and abuts against the large flat positioning end face. The large flat surface of the workpiece covers and blocks the air outlet.

[0008] Preferably, the cone seat is provided with a wedge-shaped outer cone surface near the front end of the expansion sleeve, and the inner surface of the expansion sleeve is provided with an inner cone surface that matches the wedge-shaped outer cone surface.

[0009] Preferably, the positioning disk has a hollow conical bowl-shaped structure inside, and multiple chip removal holes are provided through the outer sidewall of the positioning disk along the circumferential direction.

[0010] Preferably, a pressure cap is provided at the end of the pull rod away from the connecting rod, the outer surface of the pressure cap is provided with a guide cone surface, a first internal hexagonal head screw is provided at the end of the pull rod, and the baffle is fixedly connected to the end face of the pull rod by the first internal hexagonal head screw.

[0011] Preferably, the expansion sleeve has an axially extending elastic groove on its peripheral sidewall, and the outer cylindrical surface of the expansion sleeve is a straight cylindrical surface that abuts against the inner hole of the workpiece.

[0012] Preferably, a second hexagon socket head cap screw is provided inside the body, the end of the second hexagon socket head cap screw abuts against the side wall of the expansion sleeve, the cone seat is fixedly connected inside the body by a third hexagon socket head cap screw, and the positioning plate is fixedly installed at one end of the body by a fourth hexagon socket head cap screw.

[0013] Preferably, one end of the pull rod is threadedly connected to the connecting rod, a pressure block is provided inside the connecting rod, and a set screw is threadedly connected to the side wall of the connecting rod, with the end of the set screw pressing the pressure block against the outside of the pull rod.

[0014] Preferably, the pull shaft is sleeved on one end of the connecting rod, and a countersunk hole is provided inside the pull shaft. A right retaining ring is provided in the countersunk hole, and the right retaining ring is fixedly connected to the end face of the connecting rod by a fourth internal hexagon socket head cap screw; an O-ring is sleeved between the body and the cone seat.

[0015] Preferably, a guide groove is provided on the outer sidewall of the connecting rod along the axial direction, and an anti-rotation screw is provided through the outer sidewall of the main body, with the end of the anti-rotation screw abutting in the guide groove.

[0016] Preferably, a lifting eye screw is provided at the top outer end of the body, and the lifting eye screw is threadedly connected to the outer wall of the body.

[0017] The above solution achieves the following beneficial technical effects:

[0018] This invention, through a large-plane positioning end face combined with an airtight detection structure, can determine the workpiece clamping position. After the large-plane of the workpiece is in contact with the positioning plate and the air outlet is blocked, the air pressure changes. The external system can automatically confirm the workpiece contact by receiving the air pressure signal, eliminating the manual confirmation and manual tightening of the pressure plate in traditional processing, maintaining the stability of the workpiece positioning and clamping accuracy, and serving as a trigger condition to open up a technical closed loop for the automation of gear milling.

[0019] This invention employs an internal tensioning structure with a wedge-shaped conical seat and a sleeve, which converts the axial tension applied by the hydraulic system into radial expansion force and backward tension. This internal tensioning combined with the reference conversion method of large-plane positioning, along with the workpiece's own weight, solves the problem of insufficient clamping force caused by the rotation and extension when using traditional shaft diameter and small-plane positioning. The transmission and cooperation structure can provide stable and reliable clamping force for the workpiece, ensuring the workpiece's stability during the gear milling process.

[0020] The positioning disk of this invention has a hollow conical bowl-shaped structure with chip removal holes through the side wall. Combined with the internal tension clamping method, an open chip removal area is formed at the front end of the fixture. During the milling process, the iron chips generated by cutting slide directly down the inner side wall of the positioning disk. With the tilting and rotation of the machine tool table, they fall out of the fixture through the chip removal holes. The chip removal channel avoids the accumulation of iron chips in the dead corners inside the fixture, reduces the frequency of manual machine stoppage for cleaning, and maintains the cleanliness of the positioning reference surface. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present invention;

[0022] Figure 2 This is a schematic diagram of the cross-sectional structure of the main body of the present invention;

[0023] Figure 3 This is a schematic diagram of the cross-sectional structure of the positioning disk of the present invention;

[0024] Figure 4 This is a schematic diagram of the cross-sectional structure of the cone seat of the present invention;

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of the pull shaft of the present invention;

[0026] Figure 6 This is a schematic diagram of the cross-sectional structure of the connecting rod of the present invention;

[0027] Figure 7 This is a schematic diagram of the cross-sectional structure of the tie rod of the present invention;

[0028] Figure 8 This is a schematic diagram of the cross-sectional structure of the expansion sleeve of the present invention.

[0029] The components are as follows: 1. Positioning plate; 2. Pull rod; 3. First socket head cap screw; 4. Baffle; 5. Expansion sleeve; 6. Second socket head cap screw; 7. Conical seat; 8. Third socket head cap screw; 9. Body; 10. Connecting rod; 11. Fourth socket head cap screw; 12. Right retaining ring; 13. Pull shaft; 14. Eye bolt; 15. O-ring seal; 16. Set screw; 17. Pressure block; 18. Anti-rotation screw. Detailed Implementation

[0030] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figures 1-4 This invention provides an automated milling fixture for a driven bevel gear integrated structure product, including a body 9. A positioning disk 1 is fixedly connected to the left side of the body 9. A pull shaft 13 is slidably passed through the body 9. One end of the pull shaft 13 is connected to a connecting rod 10 and a pull rod 2 in sequence. A cone seat 7 is fixedly provided inside the positioning disk 1. The pull rod 2 passes through the inside of the cone seat 7, and an expansion sleeve 5 located on the left side of the cone seat 7 is sleeved on the outside of the pull rod 2. A baffle 4 is connected to the end of the pull rod 2 away from the connecting rod 10.

[0032] The pull rod 2 and the baffle 4 move synchronously. One side of the baffle 4 abuts against the end face of the expansion sleeve 5. The inner surface of the expansion sleeve 5 is fitted onto the outer surface of the cone seat 7 and slides in cooperation with the outer surface of the cone seat 7. The outer circular surface of the expansion sleeve 5 expands radially and abuts against the inner hole of the workpiece.

[0033] The positioning disk 1 has a large flat positioning end face on the side away from the main body 9. An air passage is opened inside the positioning disk 1. One end of the air passage extends to the large flat positioning end face and forms an air outlet. The workpiece is driven by the expansion sleeve 5 and abuts against the large flat positioning end face. The large flat surface of the workpiece covers and blocks the air outlet.

[0034] Specifically, when the automated milling fixture of the driven bevel gear integrated structure product performs the clamping action, the hydraulic system of the external milling equipment applies a backward pulling force to the pull shaft 13. The pull shaft 13 slides backward inside the body 9. The pull shaft 13 drives the connecting rod 10 and the pull rod 2 to move backward synchronously. The backward movement of the pull rod 2 drives the end baffle 4 to move backward. The baffle 4 pushes the end face of the expansion sleeve 5 backward, forcing the expansion sleeve 5 to move backward on the outer surface of the cone seat 7. Since the inner surface of the expansion sleeve 5 is fitted and attached to the wedge-shaped outer cone surface of the cone seat 7, the expansion sleeve 5 undergoes elastic deformation under the action of external force when sliding backward. The outer circular surface of the expansion sleeve 5 expands radially, thereby tightening the inner hole of the workpiece placed outside the expansion sleeve 5.

[0035] After the workpiece is tightened, it moves backward along with the expansion sleeve 5. The large surface of the workpiece abuts against and fits against the large surface positioning end face of the positioning plate 1. The end of the air passage inside the positioning plate 1 that is away from the large surface positioning end face is connected to an external air source and air pressure detection equipment. The large surface of the workpiece covers and blocks the air outlet extending from the air passage inside the positioning plate 1. By detecting the air pressure change inside the air passage, the airtightness test of the workpiece positioning can be completed. When the automatic milling fixture of the driven bevel gear integrated structure product performs the release action, the hydraulic system of the milling equipment pushes the pull shaft 13 forward. The pull shaft 13 drives the connecting rod 10 and the pull rod 2 forward. The baffle 4 moves forward with the pull rod 2 and removes the thrust on the end face of the expansion sleeve 5. After the thrust applied to the expansion sleeve 5 is removed, the expansion sleeve 5 returns to its original shape by elasticity. The outer circular surface of the expansion sleeve 5 contracts radially, thereby loosening the inner hole of the workpiece.

[0036] The fixture provided in this embodiment uses a combination of internal hole tensioning and large plane positioning for datum conversion. This helps solve the problem of insufficient clamping force caused by large rotation when the workpiece is positioned using the shaft diameter and small plane. It can improve the accuracy of workpiece clamping and positioning from a design perspective. At the same time, the internal hole tensioning method creates a relatively open space between the workpiece and the body 9, which is conducive to the discharge of iron chips generated during gear milling and avoids the accumulation of iron chips inside. This helps to reduce manual cleaning work and maintain the stable state of gear milling. The setting of the large plane positioning end face, combined with the gravity of the workpiece, is conducive to the transmission of workpiece clamping force. With the air outlet and air tightness detection structure, the fit of the workpiece can be determined by air pressure feedback. The air pressure change signal can be directly used as a condition to confirm the accurate positioning of the workpiece and automatically trigger the gear milling program, thereby eliminating the manual inspection link, breaking through the technical bottleneck of automated gear milling, and helping to maintain the clamping accuracy of workpiece gear milling positioning.

[0037] Please see Figure 1 , Figure 4 and Figure 8 The cone seat 7 is provided with a wedge-shaped outer cone surface near the front end of the expansion sleeve 5, and the inner surface of the expansion sleeve 5 is provided with an inner cone surface that matches the wedge-shaped outer cone surface.

[0038] Specifically, the wedge-shaped outer conical surface at the front end of the cone seat 7 and the inner conical surface inside the expansion sleeve 5 fit together. When the baffle 4 pushes the expansion sleeve 5 backward, the inner conical surface of the expansion sleeve 5 slides along the wedge-shaped outer conical surface of the cone seat 7. The wedge-shaped outer conical surface forces the expansion sleeve 5 to undergo elastic deformation and expand radially outward. The structure of the conical surface mating with the conical surface can convert the axial thrust applied to the end of the expansion sleeve 5 into radial tension that expands outward. The surface contact sliding fit between the inner conical surface and the wedge-shaped outer conical surface helps the expansion sleeve 5 maintain a uniform force distribution when it is under expansion force, which is beneficial for the workpiece to maintain the alignment of the central axis when it is clamped and tightened, and also helps to reduce the local indentation damage caused by the expansion sleeve 5 to the inner hole surface of the workpiece.

[0039] Please see Figure 3 The positioning disk 1 has a hollow conical bowl-shaped structure inside, and multiple chip removal holes are opened through the outer side wall of the positioning disk 1 along the circumferential direction.

[0040] Specifically, the hollow conical bowl-shaped structure inside the positioning plate 1 provides assembly and accommodation space for the end of the workpiece, and forms a relatively open area inside the positioning plate 1. When the workpiece is milled, the iron chips generated by the cutting fall into the interior of the positioning plate 1. With the tilting and rotation of the milling machine table, the scattered iron chips slide down the inner side wall of the hollow conical bowl-shaped structure of the positioning plate 1 and fall directly through the chip removal hole on the outer side wall of the positioning plate 1 to the outside of the fixture. The chip removal hole provides a clear discharge channel for the iron chips, reducing the accumulation of iron chips in the dead corners inside the fixture. The smooth discharge of iron chips maintains the cleanliness of the large flat positioning end face of the positioning plate 1, reduces the positioning deviation caused by the workpiece being raised due to the residue of debris, and also reduces the frequency of manual shutdown to clean the interior of the fixture.

[0041] Please see Figure 1 , Figure 6 and Figure 7 A pressure cap is provided at the end of the pull rod 2 away from the connecting rod 10. A guide cone surface is provided on the outer surface of the pressure cap. A first internal hexagonal head screw 3 is provided at the end of the pull rod 2. The baffle 4 is fixedly connected to the end face of the pull rod 2 by the first internal hexagonal head screw 3.

[0042] Specifically, the guide cone surface on the outer surface of the end cap of the pull rod 2 plays a guiding role during the workpiece loading stage. When the workpiece is placed into the fixture, the inner hole edge of the workpiece first contacts the guide cone surface and slides inward along the inclined surface of the guide cone surface, guiding the workpiece into the fixture. This setting helps to reduce jamming during workpiece assembly and reduce resistance during automated or manual assembly loading. The first internal hexagonal head screw 3 fastens the baffle 4 to the end face of the pull rod 2, ensuring that the pulling force of the pull rod 2 moving backward can be stably transmitted to the expansion sleeve 5 through the baffle 4. The screw fixing method also facilitates daily disassembly and replacement of the front end parts.

[0043] Please see Figure 1 and Figure 8 The expansion sleeve 5 has an axially extending elastic groove on its side wall. The outer cylindrical surface of the expansion sleeve 5 is a straight cylindrical surface, which abuts against the inner hole of the workpiece.

[0044] Specifically, the elastic grooves extending axially along the sidewalls of the expansion sleeve 5 provide space for radial deformation of the metal expansion sleeve 5. When the expansion sleeve 5 slides backward along the wedge-shaped outer cone and expands under force, the gap of the elastic grooves widens, allowing the expansion sleeve 5 to smoothly undergo outward elastic deformation. After the external force is removed, the groove structure, combined with the elasticity of the material itself, causes the expansion sleeve 5 to contract and return to its original position. The straight cylindrical surface on the outside of the expansion sleeve 5 is adapted to the cylindrical inner hole of the workpiece. In the tensioned state, the straight cylindrical surface is in close contact with the inner hole of the workpiece, providing a large frictional contact area, so that the clamping force is relatively evenly distributed on the inner surface of the workpiece. This surface contact clamping method maintains the stability of the workpiece during the gear milling process, while reducing the possibility of damage to the inner hole of the workpiece due to local force concentration.

[0045] Please see Figure 1 and Figure 2 The body 9 is provided with a second internal hexagonal head screw 6. The end of the second internal hexagonal head screw 6 abuts against the side wall of the expansion sleeve 5. The cone seat 7 is fixedly connected to the body 9 by a third internal hexagonal head screw 8. The positioning plate 1 is fixedly installed at one end of the body 9 by a fourth internal hexagonal head screw 11.

[0046] Specifically, the end of the second internal hexagonal head screw 6 inside the body 9 abuts against the side wall area of ​​the expansion sleeve 5. The limiting effect of the screw end restricts the circumferential rotation of the expansion sleeve 5 during axial movement, preventing the expansion sleeve 5 from deflecting or misaligning. The third internal hexagonal head screw 8 locks the cone seat 7 inside the body 9, so that the cone seat 7 can stably withstand the inward squeezing reaction force generated when the expansion sleeve 5 expands and slides. The positioning plate 1 is fixedly installed on one end of the body 9 by fastening bolts, closing the left side opening of the body 9 and maintaining the stability of the overall structure. The use of internal hexagonal head screws for fastening also provides convenience for the daily disassembly, assembly and maintenance of the fixture.

[0047] Please see Figure 1 , Figure 6 and Figure 7 One end of the pull rod 2 is threadedly connected to the connecting rod 10. The connecting rod 10 has a pressure block 17 inside. The side wall of the connecting rod 10 is threadedly connected to a set screw 16. The end of the set screw 16 presses the pressure block 17 against the outside of the pull rod 2.

[0048] Specifically, the pull rod 2 and the connecting rod 10 are connected by a threaded connection. This connection method allows for adjustment of the relative elongation between the pull rod 2 and the connecting rod 10 during the initial assembly. When the set screw 16 is tightened inward on the side wall of the connecting rod 10, the end of the set screw 16 will apply a thrust to the internal space, firmly pressing the pressure block 17 inside the connecting rod 10 onto the outer surface of the pull rod 2. After the pressure block 17 is in contact, it increases the frictional resistance on the outside of the pull rod 2, thereby forming a thread anti-loosening structure. The anti-loosening structure can resist the mechanical vibration generated during gear milling and prevent the threaded connection between the pull rod 2 and the connecting rod 10 from loosening, ensuring the stability of the internal tension transmission structure of the fixture.

[0049] Please see Figure 1 The pull shaft 13 is sleeved on one end of the connecting rod 10. The pull shaft 13 has a countersunk hole inside, and a right retaining ring 12 is installed in the countersunk hole. The right retaining ring 12 is fixedly connected to the end face of the connecting rod 10 by a fourth internal hexagonal head screw 11. An O-ring 15 is sleeved between the body 9 and the cone seat 7.

[0050] Specifically, one end of the pull shaft 13 is connected to an external milling device to receive hydraulic driving force. The pull shaft 13 is sleeved on the outside of the connecting rod 10. The right retaining ring 12 is placed in the countersunk hole inside the pull shaft 13, and the fourth internal hexagonal head screw 11 passes through the right retaining ring 12 and is screwed into the end face of the connecting rod 10. This assembly form restricts the pull shaft 13 between the right retaining ring 12 and the end protrusion structure of the connecting rod 10. When the pull shaft 13 moves backward, the countersunk step surface inside the pull shaft 13 pushes the right retaining ring 12, causing the connecting rod 10 to move backward synchronously. When the pull shaft 13 moves forward, the step surface at the front end of the pull shaft 13 directly pushes the connecting rod 10, causing the connecting rod 10 to move forward synchronously, thereby realizing the bidirectional transmission of hydraulic push and pull force. The O-ring seal 15 sleeved between the body 9 and the cone seat 7 fills the mechanical assembly gap between the body 9 and the cone seat 7, preventing the gas used for air tightness testing from leaking outward along the joint gap of the parts, ensuring the accuracy of the air tightness test value.

[0051] Please see Figure 1 and Figure 6 A guide groove is provided on the outer side wall of the connecting rod 10 along the axial direction, and an anti-rotation screw 18 is provided through the outer side wall of the body 9, with the end of the anti-rotation screw 18 abutting in the guide groove.

[0052] Specifically, the anti-rotation screw 18 passes through the side wall of the body 9 in a stationary state, and the end of the anti-rotation screw 18 extends into the guide groove outside the connecting rod 10. When the pull shaft 13 drives the connecting rod 10 to slide axially, the guide groove on the connecting rod 10 slides along the end of the anti-rotation screw 18. The end of the anti-rotation screw 18 abuts against the side wall of the guide groove, forming a circumferential block, which restricts the connecting rod 10 from rotating inside the body 9. The structure of the side wall slot and the screw guide allows the connecting rod 10 to move smoothly back and forth along the axial direction, while preventing the connecting rod 10 from rotating due to the processing torque, thereby protecting the threaded connection between the internal pull rod 2 and the connecting rod 10 from loosening.

[0053] Please see Figure 1 A lifting eye screw 14 is provided at the top of the outer side of the body 9, and the lifting eye screw 14 is threaded to the outer wall of the body 9.

[0054] Specifically, the eye bolt 14 is screwed into the top of the outermost body 9 of the fixture through threads. When the fixture is being transported, transferred, or initially installed and later disassembled on the machine tool workbench, the hook of the workshop's lifting equipment can be inserted into the ring part of the eye bolt 14. The fixture as a whole contains multiple metal structural parts and is relatively heavy. The eye bolt 14 provides a clear load-bearing lifting point for the fixture, making it convenient for maintenance and assembly personnel to quickly position and transport the entire fixture using lifting equipment.

[0055] Working principle:

[0056] In use, the workpiece is placed in the front end of the fixture. The workpiece is guided into the fixture along the conical surface at the front end of the pull rod 2. The hydraulic system of the equipment drives the pull shaft 13 to move backward. The pull shaft 13 drives the connecting rod 10 to move backward. The connecting rod 10 drives the pull rod 2 to move backward. The backward movement of the pull rod 2 drives the baffle 4 to move backward. The baffle 4 applies a backward thrust to the expansion sleeve 5, causing the expansion sleeve 5 to move backward. When the expansion sleeve 5 moves backward, the inner surface of the expansion sleeve 5 slides relative to the wedge-shaped surface at the front end of the cone seat 7. The expansion sleeve 5 expands radially outward and generates elastic deformation. The outer circular surface of the expansion sleeve 5 contacts and adheres tightly to the inner hole surface of the workpiece. As the pull rod 2 continues to move backward, it drives the expansion sleeve 5 and the workpiece to move backward as a whole. The large plane of the workpiece moves to fit against the left end face of the positioning plate 1. The large plane of the workpiece covers the air outlet of the air passage on the end face of the positioning plate 1. The air pressure inside the air passage increases. The external system receives the air pressure change signal, confirms that the workpiece is clamped in place, and automatically triggers the start of the gear milling program. During subsequent milling, the machine tool table tilts and rotates the entire fixture. Cutting chips are discharged through the openings on the side wall of the positioning disc 1 and exit the fixture. The hydraulic system drives the pull shaft 13 forward, which in turn moves the connecting rod 10 forward. The connecting rod 10 then moves the pull rod 2 forward, which in turn moves the baffle 4 forward. The backward thrust of the baffle 4 on the expansion sleeve 5 is removed, causing the expansion sleeve 5 to elastically recover and contract radially inward. The outer surface of the expansion sleeve 5 detaches from the inner surface of the workpiece. The machine tool table resets, removing the workpiece from the fixture.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An automated milling fixture for driven bevel gear integrated structure products, characterized in that, Includes a body (9), a positioning disk (1) is fixedly connected to the left side of the body (9), a pull shaft (13) is slidably passed through the body (9), a connecting rod (10) and a pull rod (2) are connected to one end of the pull shaft (13) in sequence, a cone seat (7) is fixedly provided inside the positioning disk (1), the pull rod (2) passes through the inside of the cone seat (7), and an expansion sleeve (5) located on the left side of the cone seat (7) is sleeved on the outside of the pull rod (2), and a baffle (4) is connected to the end of the pull rod (2) away from the connecting rod (10). The pull rod (2) moves synchronously with the baffle (4). One side of the baffle (4) abuts against the end face of the expansion sleeve (5). The inner surface of the expansion sleeve (5) is sleeved on the outer surface of the cone seat (7) and slides in cooperation with the outer surface of the cone seat (7). The outer circular surface of the expansion sleeve (5) expands radially and abuts against the inner hole of the workpiece. The positioning disk (1) has a large flat positioning end face on the side away from the body (9). An air passage is opened inside the positioning disk (1). One end of the air passage extends to the large flat positioning end face and forms an air outlet. The workpiece is driven by the expansion sleeve (5) and abuts against the large flat positioning end face. The large flat surface of the workpiece covers and blocks the air outlet.

2. The automated milling fixture for the driven bevel gear integrated structure product according to claim 1, characterized in that, The cone seat (7) is provided with a wedge-shaped outer cone surface near the front end of the expansion sleeve (5), and the inner surface of the expansion sleeve (5) is provided with an inner cone surface that matches the wedge-shaped outer cone surface.

3. The automated milling fixture for the driven bevel gear integrated structure product according to claim 1, characterized in that, The positioning disk (1) has a hollow conical bowl-shaped structure inside, and multiple chip removal holes are opened through the outer side wall of the positioning disk (1) along the circumferential direction.

4. The automated milling fixture for the driven bevel gear integrated structure product according to claim 1, characterized in that, The pull rod (2) is provided with a pressure cap at one end away from the connecting rod (10). The outer surface of the pressure cap is provided with a guide cone surface. The end of the pull rod (2) is provided with a first internal hexagonal head screw (3). The baffle (4) is fixedly connected to the end face of the pull rod (2) by the first internal hexagonal head screw (3).

5. The automated milling fixture for the driven bevel gear integrated structure product according to claim 2, characterized in that, The expansion sleeve (5) has an axially extending elastic groove on its peripheral sidewall. The outer cylindrical surface of the expansion sleeve (5) is a straight cylindrical surface, which abuts against the inner hole of the workpiece.

6. The automated milling fixture for the driven bevel gear integrated structure product according to claim 1, characterized in that, The body (9) is provided with a second internal hexagonal head screw (6), the end of the second internal hexagonal head screw (6) abuts against the side wall of the expansion sleeve (5), the cone seat (7) is fixedly connected to the body (9) by a third internal hexagonal head screw (8), and the positioning plate (1) is fixedly installed at one end of the body (9) by a fourth internal hexagonal head screw (11).

7. The automated milling fixture for the driven bevel gear integrated structure product according to claim 1, characterized in that, One end of the pull rod (2) is threadedly connected to the connecting rod (10). A pressure block (17) is provided inside the connecting rod (10). A set screw (16) is threadedly connected to the side wall of the connecting rod (10). The end of the set screw (16) presses the pressure block (17) against the outside of the pull rod (2).

8. The automated milling fixture for the driven bevel gear integrated structure product according to claim 1, characterized in that, The pull shaft (13) is sleeved on one end of the connecting rod (10). The pull shaft (13) has a countersunk hole inside, and a right retaining ring (12) is provided in the countersunk hole. The right retaining ring (12) is fixedly connected to the end face of the connecting rod (10) by a fourth internal hexagonal head screw (11). An O-ring (15) is sleeved between the body (9) and the cone seat (7).

9. The automated milling fixture for the driven bevel gear integrated structure product according to claim 1, characterized in that, The outer sidewall of the connecting rod (10) is provided with a guide groove along the axial direction, and the outer sidewall of the body (9) is provided with an anti-rotation screw (18) through it, with the end of the anti-rotation screw (18) abutting in the guide groove.

10. The automated milling fixture for the driven bevel gear integrated structure product according to claim 1, characterized in that, The outer top of the body (9) is provided with a lifting eye screw (14), which is threaded to the outer wall of the body (9).

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