Floating hold-down clamp

Abstract

The application discloses a floating pressing clamp, which comprises an adapter flange, the top of the adapter flange is uniformly provided with a plurality of hollow adapter pins in the circumferential direction, the top of the plurality of hollow adapter pins is commonly provided with an end face tooth positioning piece, a bolt is arranged in each hollow adapter pin, and the top and bottom of the bolt are embedded in the end face tooth positioning piece and the adapter flange respectively; the top of the adapter flange is provided with a floating linkage ring, the floating linkage ring comprises a bottom plate, the two sides of the bottom plate are both provided with a fixing seat, and a guide key groove is arranged on each fixing seat; the single tensioning action of a machine tool oil cylinder is converted into the pressing action of a plurality of positions of a part to be machined through the setting of a pull rod ball head connecting rod, the floating linkage ring, a left hemisphere nut, a right hemisphere nut, the floating linkage ring and a pressing claw, so that the structure of a plurality of pressing oil cylinders is replaced, and the technical problem that a traditional clamp in the prior art cannot perform floating pressing on parts with different heights is solved.

Description

Technical Field

[0001] This invention belongs to the field of automotive transmissions and relates to a clamp, specifically a floating clamping clamp. Background Technology

[0002] Flanges are common components in automotive gearboxes and other power transmission equipment, and face teeth are the most common connection method. Currently, the most common method for machining flange face teeth is to use a broaching machine combined with a broaching tool for broaching. Broaching machine equipment and broaching tools are expensive, and the broaching tool has a limited lifespan. To ensure a strict relative positional relationship between the face teeth and the internal splines, multiple precision machining processes are required in the preceding stages to establish the broaching face tooth process reference (machining accuracy significantly exceeding the design requirements of the part drawings), thereby ensuring the final broaching accuracy of the face teeth. Furthermore, burrs formed during the broaching process are difficult to remove.

[0003] Precision forging of end face teeth is currently the most advanced technology for forming end face teeth. Compared with traditional end face tooth broaching, precision forged end face teeth have continuous metal flow lines, superior mechanical properties, and are a more economical processing route.

[0004] The traditional flange processing technology is as follows: blank forging -- rough turning one end -- rough turning the other end -- heat treatment -- spline drawing -- finish turning one end -- finish turning the other end -- drilling and boring -- machining end face teeth -- milling notches -- deburring -- black zinc plating -- finish turning -- polishing.

[0005] The process for precision forging flanges is as follows: forging blank and notch — precision forging end face teeth and threaded through holes — rough and fine machining of the large end — fine machining of the small end — heat treatment — spline — black zinc plating — fine machining — polishing.

[0006] In contrast, replacing the drawing process with the forging process can save on the entire flange manufacturing process: one roughing, one finishing, one drilling and reaming, one milling, and one deburring, totaling five processes.

[0007] The challenge in implementing the new process route lies in the fact that traditional flange manufacturing processes follow a progression from low to high precision, and from roughing to finishing. High-precision process benchmarks are created through precision turning and drilling / boring processes to ultimately ensure a symmetry of 0.05 between the broached end face teeth and the internal spline. Forged end face tooth flanges, however, have their end face teeth forged from the outset. A major challenge is how to reliably transfer the forged end face tooth benchmark to the internal spline and achieve mass production on an automated line. The corresponding fixture design is crucial. Summary of the Invention

[0008] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a floating clamping fixture to solve the technical problem that traditional fixtures in the prior art cannot perform floating clamping on parts of different heights.

[0009] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0010] A floating clamping fixture includes an adapter flange, wherein a plurality of hollow adapter pins are uniformly arranged circumferentially on the top of the adapter flange, and an end face tooth positioning element is provided on the top of the plurality of hollow adapter pins. Each hollow adapter pin is provided with a bolt, and the top and bottom of the bolt are respectively embedded in the end face tooth positioning element and the adapter flange.

[0011] The top of the adapter flange is provided with a floating linkage ring, the floating linkage ring includes a base plate, and fixed seats are provided on both sides of the base plate. Each fixed seat is provided with a guide keyway. A first mounting hole is provided at the center of the base plate, and a pair of second mounting holes are symmetrically provided on both sides of the first mounting hole.

[0012] The first mounting hole is provided with a symmetrical left hemisphere nut and a left hemisphere nut, and a ball head connecting rod is provided in the circular cavity formed by the left hemisphere nut and the left hemisphere nut. The bottom of the ball head connecting rod extends out of the circular cavity and is provided with a pull rod; a pair of second mounting holes are provided with two symmetrical hollow adapter pins;

[0013] The top outer edge of the adapter flange is provided with a pair of symmetrical guide rings. Each guide ring includes a mounting plate. The mounting plate has fixed protrusions on both sides. The mounting plate is provided with a pressure claw bearing raceway. A pressure claw is rotatably disposed in the pressure claw bearing raceway. The end of the pressure claw is hinged to the top of the fixed seat. The mounting plate is provided with a guide keyway. A guide key is disposed in the guide keyway. The guide keyway communicates with the pressure claw bearing raceway.

[0014] This invention also includes the following technical features:

[0015] A first pin is provided in the raceway of the pressure claw bearing, and the pressure claw is rotatably sleeved on the first pin; a rolling bearing is provided between the pressure claw and the first pin.

[0016] The end of the first pin is provided with a first open retaining ring.

[0017] Each of the guide keyways has a pair of clamping claw mounting pin holes on the fixing seats on both sides. A second pin is provided in each pair of clamping claw mounting pin holes. The end of the clamping claw is hinged to the second pin. A second open retaining ring is provided on the second pin on both sides of the clamping claw.

[0018] The guide key is set in the guide keyway by a guide key screw.

[0019] The pull rod and the ball joint connecting rod are connected by a thread; the left hemisphere nut and the left hemisphere nut are connected by a thread to the first mounting hole of the floating linkage ring.

[0020] The circular cavity and the ball joint of the ball joint connecting rod disposed in the circular cavity are connected by a ball joint.

[0021] Compared with the prior art, the beneficial technical effects of this invention are:

[0022] (I) In this invention, by setting up a tie rod ball joint connecting rod, a floating linkage ring, a left hemisphere nut, a left hemisphere nut, a floating linkage ring and a pressure claw, the single clamping action of the machine tool cylinder is converted into a clamping action that realizes multiple positions of the workpiece to be processed, thereby replacing the structure of setting up multiple clamping cylinders and solving the technical problem that traditional fixtures in the prior art cannot perform floating clamping of parts with different heights.

[0023] (II) This invention can achieve floating clamping, and has a very high tolerance for the shape and position tolerances of the clamped features of the processed parts. It can reliably clamp even the blank surface without precision machining. Without modification, it can be used on rotary spindles (lathes, end face grinders, cylindrical grinders, etc.) with a single tensioning cylinder for multi-point floating clamping of parts. Attached Figure Description

[0024] Figure 1 This is a cross-sectional schematic diagram of the present invention;

[0025] Figure 2 for Figure 1 A schematic diagram of the middle section structure;

[0026] Figure 3 This is an assembly diagram of the ball joint connecting rod in this invention;

[0027] Figure 4 This is a three-dimensional structural diagram of the floating linkage ring in this invention;

[0028] Figure 5 This is a cross-sectional schematic diagram of the floating linkage ring in this invention;

[0029] Figure 6 This is a three-dimensional structural schematic diagram of the guide ring in this invention;

[0030] Figure 7 This is a cross-sectional schematic diagram of the guide ring in this invention;

[0031] Figure 8 This is a simulation diagram of the present invention when pressing down parts of unequal height.

[0032] The meanings of the labels in the diagram are as follows: 1. Tie rod, 2. Adapter flange, 3. Ball head connecting rod, 4. Guide key, 5. Hollow adapter pin, 6. Floating linkage ring, 7. Guide key screw, 8. Guide ring, 9. No. 1 pin, 10. No. 1 open retaining ring, 11. Rolling bearing, 12. Claw, 13. No. 2 pin, 14. No. 2 open retaining ring, 15. Bolt, 16. End face tooth positioning part, 17. Left hemisphere nut, 18. Left hemisphere nut.

[0033] Base plate 601, fixed seat 602, guide keyway 603, first mounting hole 604, second mounting hole 605, pressure claw mounting pin hole 606;

[0034] Mounting plate 801, fixing protrusion 802, pressure claw bearing raceway 803, guide keyway 804.

[0035] The specific content of the present invention will be further explained in detail below with reference to the embodiments. Detailed Implementation

[0036] It should be noted that, unless otherwise specified, all components in this invention are those known in the art.

[0037] The following are specific embodiments of the present invention. It should be noted that the present invention is not limited to the following specific embodiments. All equivalent modifications made based on the technical solutions of this application fall within the protection scope of the present invention.

[0038] This invention provides a floating clamping fixture, see [link to relevant documentation]. Figures 1 to 7 The adapter flange 2 includes a plurality of hollow adapter pins 5 evenly arranged circumferentially on the top of the adapter flange 2. The top of the plurality of hollow adapter pins 5 is provided with an end face tooth positioning element 16. Each hollow adapter pin 5 is provided with a bolt 15. The top and bottom of the bolt 15 are respectively embedded in the end face tooth positioning element 16 and the adapter flange 2.

[0039] The top of the adapter flange 2 is provided with a floating linkage ring 6. The floating linkage ring 6 includes a base plate 601. Both sides of the base plate 601 are provided with fixed seats 602. Each fixed seat 602 is provided with a guide keyway 603. The center of the base plate 601 is provided with a first mounting hole 604. A pair of second mounting holes 605 are symmetrically provided on both sides of the first mounting hole 604.

[0040] The first mounting hole 604 is provided with symmetrical left hemisphere nuts 17 and 18. The circular cavity formed by the left hemisphere nuts 17 and 18 is provided with a ball head connecting rod 3. The bottom of the ball head connecting rod 3 extends out of the circular cavity and is provided with a pull rod 1. Two symmetrical hollow adapter pins 5 are provided in a pair of second mounting holes 605.

[0041] The top outer edge of the adapter flange 2 is provided with a pair of symmetrical guide rings 8. Each guide ring 8 includes a mounting plate 801. The mounting plate 801 has fixed protrusions 802 on both sides. The mounting plate 801 is provided with a claw bearing raceway 803. A claw 12 is rotatably disposed in the claw bearing raceway 803. The end of the claw 12 is hinged to the top of the fixed seat 602. The mounting plate 801 is provided with a guide keyway 804. A guide key 4 is disposed in the guide keyway 804. The guide keyway 804 communicates with the claw bearing raceway 803.

[0042] In the above technical solution, the machine tool cylinder transmits the extension and retraction actions to the pull rod 1. The pull rod 1 drives the ball head of the ball head connecting rod 3 to rotate relative to the center of the circular cavity formed by the left hemisphere nut 17 and the left hemisphere nut 18, and moves along the axis of the ball head connecting rod 3. The left hemisphere nut 17, the left hemisphere nut 18, and the floating linkage ring 6 move together along the axis of the ball head connecting rod 3 and rotate around the center of the circular cavity formed by the left hemisphere nut 17 and the left hemisphere nut 18. At the same time, the floating linkage ring 6 also drives... The pressure claw 12 moves along the axis of the ball-head connecting rod 3 and rotates around the center of the circular cavity formed by the left hemisphere nut 17 and the left hemisphere nut 18; at the same time, combined with the rotation of the pressure claw 12 in the pressure claw bearing raceway 803, a triple planar composite motion can be achieved: the pressure claw 12 moves along the axis of the ball-head connecting rod 3 in the plane of the guide keyway 603 parallel to the floating linkage ring 6, rotates around the center of the circular cavity formed by the left hemisphere nut 17 and the left hemisphere nut 18, and rotates in the pressure claw bearing raceway 803.

[0043] The guide key 4 installed on the guide ring 8 cooperates with the guide keyway 603 on the floating linkage ring 6, constraining the floating linkage ring 6 and the left and right inner ball nuts to rotate together around the center of the left and right inner ball nuts in a plane parallel to the guide keyway of the floating linkage ring.

[0044] In this invention, by setting up a ball-head connecting rod 3, a floating linkage ring 6, a left hemisphere nut 17, a left hemisphere nut 18, a floating linkage ring, and a pressure claw, the single clamping action of the machine tool cylinder is converted into a clamping action that achieves multiple positions of the workpiece to be processed. This replaces the structure of setting up multiple clamping cylinders and solves the technical problem that traditional fixtures in the prior art cannot perform floating clamping on parts of different heights.

[0045] See Figure 8 The simulated part has a 2.5mm height difference between the left and right clamping points. The floating linkage ring 6, the left hemisphere nut 17, the left hemisphere nut 18, and the left clamping claw 12 start to rotate around the center of the circular cavity formed by the left hemisphere nut 17 and the left hemisphere nut 18. The rotation is 0.38° counterclockwise in the plane of the guide keyway 603 parallel to the floating linkage ring 6. The angles between the left clamping claw 12 and the horizontal plane are 161.96° and 158.31°, respectively, thus realizing the floating clamping function.

[0046] A first pin 9 is provided in the raceway 803 of the pressure claw bearing, and a pressure claw 12 is rotatably sleeved on the first pin 9; a rolling bearing 11 is provided between the pressure claw 12 and the first pin 9.

[0047] In the above technical solution, by setting a first pin 9 and a rolling bearing 11, the pressure claw 12 can rotate on the first pin 9. The rolling bearing 11 contacts the pressure claw bearing raceway 803, which transforms the sliding friction movement of the pressure claw 12 relative to the pressure claw bearing raceway 803 into rolling contact between the rolling bearing 11 and the pressure claw bearing raceway, thereby reducing friction, reducing wear, and improving service life.

[0048] The guide ring 8 has a vertically parallel and inclined pressure claw bearing raceway 803. The pressure claw bearing raceway 803 constrains the rolling bearing 11, which is hinged to the pressure claw, so that its movement trajectory can only be parallel to the pressure claw bearing raceway 803.

[0049] The end of the first pin 9 is provided with a first open retaining ring 10.

[0050] In the above technical solution, by securing the No. 1 opening retaining ring 10 to one end of the No. 1 pin 9, the No. 1 pin 9 is prevented from coming out of the pin hole of the pressure claw 12, thus ensuring the stability and safety of the structure.

[0051] Each guide keyway 603 has a pair of pressure claw mounting pin holes 606 on the fixing seats 602 on both sides. A second pin 13 is provided in the pair of pressure claw mounting pin holes 606. The end of the pressure claw 12 is hinged to the second pin 13. A second open retaining ring 14 is provided on the second pin 13 on both sides of the pressure claw 12.

[0052] In the above technical solution, the pressure claw 12 is mounted on the second pin 13, and the second pin 13 is mounted in the pressure claw mounting pin hole 606 of the floating linkage ring 6. The second open retaining ring 14 ensures that the second pin 13 will not come out of the pin hole of the floating linkage ring 6. That is, the pressure claw 12 is hinged and mounted on the floating linkage ring 6. While the pressure claw 12 moves with the floating linkage ring 6, it can also rotate around the second pin 13. The movement of the pressure claw 12 with the floating linkage ring 6 is the active movement, and the rotation of the pressure claw 12 around the second pin 13 is the passive movement. The passive movement of the pressure claw 12 around the second pin 13 is completed by the rolling bearing 11 mounted on the pressure claw 12 under the guidance of the pressure claw bearing raceway.

[0053] The guide key 4 is set in the guide keyway 804 by the guide key screw 7.

[0054] In the above technical solution, the guide key 4 cooperates with the keyway of the floating linkage ring 6 to guide the movement of the floating linkage ring 6 to be carried out in a plane parallel to the keyway surface of the floating linkage ring 6.

[0055] The pressure claw 12 moves in a plane parallel to the keyway surface along with the floating linkage ring 6, ensuring effective contact between the outer cylindrical surface of the rolling bearing 11 mounted on the pressure claw 12 and the raceway 803 of the pressure claw bearing, and preventing the two end faces of the rolling bearing 11 mounted on the pressure claw 12 from interfering with any place and causing movement jamming.

[0056] The tie rod 1 and the ball head connecting rod 3 are threaded together; the left hemisphere nut 17 and the left hemisphere nut 18 are threaded together with the first mounting hole 604 of the floating linkage ring 6.

[0057] In the above technical solution, the left hemisphere nut 17 and the left hemisphere nut 18 wrap around the ball head of the ball head connecting rod 3 and merge into a whole complete nut, which is threadedly connected to the first mounting hole 604 of the floating linkage ring 6, driving the floating linkage ring 6 to move along the axial direction of the ball head connecting rod 3. At the same time, the floating linkage ring 6, the left hemisphere nut 17 and the left hemisphere nut 18 are allowed to rotate together around the center of the circular cavity formed by the left hemisphere nut 17 and the left hemisphere nut 18.

[0058] The circular cavity and the ball joint of the ball joint connecting rod 3 located in the circular cavity are connected by a ball joint.

[0059] In the above technical solution, the ball joint connection enables the ball center of the ball head connecting rod 3 to rotate relative to the ball centers of the left hemisphere nut 17 and the left hemisphere nut 18, while simultaneously driving the left hemisphere nut 17 and the left hemisphere nut 18 to move up and down along the axis of the ball head connecting rod 3.

Claims

1. A floating clamping fixture, characterized in that, The system includes a transition flange (2), on which a plurality of hollow transition pins (5) are evenly arranged circumferentially on the top. The top of the plurality of hollow transition pins (5) is provided with an end face tooth positioning element (16). Each hollow transition pin (5) is provided with a bolt (15). The top and bottom of the bolt (15) are respectively embedded in the end face tooth positioning element (16) and the transition flange (2). The top of the adapter flange (2) is provided with a floating linkage ring (6), the floating linkage ring (6) includes a base plate (601), and fixed seats (602) are provided on both sides of the base plate (601). Each fixed seat (602) is provided with a guide keyway (603). A first mounting hole (604) is provided at the center of the base plate (601), and a pair of second mounting holes (605) are symmetrically provided on both sides of the first mounting hole (604). The first mounting hole (604) is provided with a symmetrical left hemisphere nut (17) and a right hemisphere nut (18). A ball head connecting rod (3) is provided in the circular cavity formed by the left hemisphere nut (17) and the right hemisphere nut (18). The bottom of the ball head connecting rod (3) extends out of the circular cavity and is provided with a pull rod (1). Two symmetrical hollow adapter pins (5) are provided in a pair of second mounting holes (605). The top outer edge of the adapter flange (2) is provided with a pair of symmetrical guide rings (8). Each guide ring (8) includes a mounting plate (801). The mounting plate (801) has fixed protrusions (802) on both sides. The mounting plate (801) is provided with a claw bearing raceway (803). A claw (12) is rotatably provided in the claw bearing raceway (803). The end of the claw (12) is hinged to the top of the fixed seat (602). The mounting plate (801) is provided with a guide keyway (804). A guide key (4) is provided in the guide keyway (804). The guide keyway (804) communicates with the claw bearing raceway (803).

2. The floating clamping fixture as described in claim 1, characterized in that, A first pin (9) is provided in the raceway (803) of the pressure claw bearing, and the pressure claw (12) is rotatably sleeved on the first pin (9); a rolling bearing (11) is provided between the pressure claw (12) and the first pin (9).

3. The floating clamping fixture as described in claim 2, characterized in that, The end of the first pin (9) is provided with a first open retaining ring (10).

4. The floating clamping fixture as described in claim 1, characterized in that, Each guide keyway (603) has a pair of clamping claw mounting pin holes (606) on the fixing seats (602) on both sides. A second pin (13) is provided in the pair of clamping claw mounting pin holes (606). The end of the clamping claw (12) is hinged to the second pin (13). A second open retaining ring (14) is provided on the second pin (13) on both sides of the clamping claw (12).

5. The floating clamping fixture as described in claim 1, characterized in that, The guide key (4) is set in the guide keyway (804) by a guide key screw (7).

6. The floating clamping fixture as described in claim 1, characterized in that, The pull rod (1) and the ball head connecting rod (3) are connected by threads; the left hemisphere nut (17) and the right hemisphere nut (18) are connected by threads to the first mounting hole (604) of the floating linkage ring (6).

7. The floating clamping fixture as described in claim 1, characterized in that, The circular cavity and the ball joint of the ball joint connecting rod (3) located in the circular cavity are connected by a ball joint.

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