Eccentric indexing clamping tool for turning counter bore in claw end of coupler cylinder
By designing an eccentric indexing clamping fixture, the indexing fixture and gear structure enable rapid and precise positioning of the countersunk hole at the claw end of the coupling cylinder. This solves the problems of time-consuming and labor-intensive traditional clamping methods and the dependence of precision on operator skills, thereby improving machining accuracy and efficiency.
Patent Information
- Application Number
- CN202423292052.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-02
- Estimated Expiration
- 2034-12-31
AI Technical Summary
Traditional clamping methods require manual adjustment of the jaw position when machining countersunk holes at the claw end of coupling cylinders. This is time-consuming and labor-intensive, and the accuracy depends on the operator's skill, affecting machining accuracy and efficiency.
The eccentric indexing clamping fixture, including an indexing fixture, a chuck mounting plate, a drive gear, a driven gear plate, a locating pin, and a clamping cylinder, achieves rapid and accurate positioning of the workpiece through rotation and movement, simplifying the operation process.
It enables rapid and accurate positioning of the countersunk hole position on the workpiece, improves machining accuracy and efficiency, reduces reliance on operator skills, and makes positioning more stable and reliable.
Smart Images
Figure CN223617346U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of coupling production technology, specifically relating to an eccentric indexing clamping fixture for machining countersunk holes at the claw ends of coupling bodies. Background Technology
[0002] A coupling, also known as a shaft coupling, is used to securely connect the driving and driven shafts in different mechanisms, enabling them to rotate together and transmit motion and torque. It is a type of rotary transmission device. A coupling generally consists of two cylindrical bodies and a transmission elastic element disposed between the two bodies, which provides a buffering effect, such as... Figure 1 As shown, the coupling cylinder 1 has a central through hole 3 forming a cylindrical shape. One end of the cylinder 1 is provided with multiple cylinder protrusions 2 evenly distributed along the circumference. The cylinder protrusions 2 are also commonly referred to as claws, so the end with the cylinder protrusions 2 is also called the claw end of the coupling cylinder. The end face of the claw end of the coupling cylinder is provided with multiple countersunk holes 4, each countersunk hole 4 being located in the middle position between two adjacent cylinder protrusions 2. In application, the multiple cylinder protrusions 2 of the two cylinders 1 are arranged alternately, and a conventional elastic body is installed between adjacent cylinder protrusions 2. The two cylinders 1 are connected to the driving shaft and the driven shaft respectively, so that the rotational transmission function between the driving shaft and the driven shaft can be realized.
[0003] When machining the cylinder 1, first machine the central through hole 3 on the cylindrical metal rod to form a cylindrical shape, then machine multiple cylindrical protrusions 2 at one end, and then machine the countersunk hole 4. Before machining the countersunk hole 4, the workpiece (i.e., the cylinder before the countersunk hole 4 is machined) needs to be reliably clamped. The traditional clamping method is to use a multi-jaw (usually three-jaw or four-jaw) chuck mounted on a clamping seat to clamp the workpiece. The clamping seat is mounted on the machine tool's spindle, and the center line of the chuck coincides with the rotation center line of the clamping seat (i.e., the center line of the disc-shaped clamping seat, which rotates around this rotation center line when the clamping seat rotates). When machining the countersunk hole 4, the machine tool drives the clamping seat, chuck, and workpiece to rotate, and the cutting tool is gradually advanced to the location of the countersunk hole 4 to achieve the drilling purpose. Because the location of the countersunk hole 4 is not on the center line of the workpiece, this machining method requires manual adjustment of the position of each jaw on the chuck to make the workpiece and the chuck eccentric (i.e., the center line of the chuck does not coincide with the center line of the workpiece), so that the location of the countersunk hole 4 to be machined is on the center line of the chuck and also on the center line of the clamping seat. Only in this way can the normal turning machining of the countersunk hole 4 be achieved. The above-mentioned traditional clamping method has the following drawbacks: After machining a countersunk hole 4, it is necessary to manually readjust and align the position of each chuck so that the position of the next countersunk hole 4 to be machined is on the center line of the chuck. This process is very time-consuming and requires a high level of skill. The clamping accuracy largely depends on the operator's adjustment skills. Improper operation will affect the machining accuracy, so the machining accuracy of the workpiece cannot be guaranteed. Moreover, the operation is time-consuming, labor-intensive, and inefficient. Utility Model Content
[0004] The purpose of this invention is to provide an eccentric indexing clamping fixture that is easy to operate and has high clamping accuracy for turning countersunk holes at the claw ends of coupling cylinders in order to solve the above problems.
[0005] This utility model achieves the above objectives through the following technical solutions:
[0006] An eccentric indexing clamping fixture for countersunk turning of the jaw end of a coupling cylinder includes a clamping seat and a chuck, and further includes an indexing fixture. The indexing fixture includes a disc-shaped indexing base and a disc-shaped chuck mounting plate. One side plane of the clamping seat is provided with a straight guide groove, and the indexing base is mounted on the side plane. Near the edge of the side plane, there are scale lines distributed along the length direction of the guide groove. A guide block is provided at the first of the two axial ends of the indexing base. The guide block is placed in the guide groove and can slide and be fixed. The outer circumference of the indexing base near the scale lines is provided with alignment marks for alignment with the scale lines. The first of the two axial ends of the chuck mounting plate is mounted on the second of the two axial ends of the indexing base and can rotate and be fixed relative to the indexing base. The chuck is mounted on the second of the two axial ends of the chuck mounting plate.
[0007] Preferably, to achieve the function of rotating and fixing the chuck mounting plate relative to the indexing seat and to improve operating efficiency, the indexing fixture further includes a driving gear, a driven gear plate, a locating pin, a clamping cylinder, and a clamping washer. The first end face of the indexing seat has a first circular recess, and the second end face has a second circular recess. A central through hole is located at the center of the indexing seat, penetrating the center of the bottom of both the first and second circular recesses. The first end of the chuck mounting plate is placed within the second circular recess. The driving gear is located near the edge of the first circular recess. One end of the driving gear is connected to a knob, and the suspended end of the knob faces towards... The second end of the indexing seat passes through the corresponding through hole on the indexing seat and extends out of the indexing seat. The driven gear disk is located in the middle of the first circular groove. A section of the outer circumference of the driven gear disk near the driving gear has multiple teeth that mesh with the teeth of the driving gear. A section of the outer circumference of the driven gear disk opposite to the driving gear forms a slide rail connection structure with the first end of the two ends of the locating pin. This slide rail connection structure allows the locating pin to move axially on the indexing seat during the rotation of the driven gear disk. A positioning through hole is provided on the indexing seat at a position corresponding to the locating pin, and both ends of this positioning through hole... The chuck mounting plate has mounting holes corresponding to the indexing seat positioning holes, which are evenly distributed circumferentially. The second end of the positioning pin passes through the indexing seat positioning holes and is placed within one of the mounting holes. The driven gear disc has a central through-hole with internal threads on its circumferential wall. The cylindrical clamping cylinder passes through the indexing seat central through-hole and can move axially but cannot rotate circumferentially. One end of the clamping cylinder is placed within the central through-hole of the driven gear disc, and the outer circumferential wall of that end of the clamping cylinder has external threads that connect with the driven gear disc via these external threads. The driven gear disk has an internal threaded connection. The first end face of the chuck mounting disk protrudes axially outward to form a cylindrical mounting disk protrusion. An annular groove is provided on the outer circumference of the mounting disk protrusion near its suspended end, and this annular groove makes the suspended end of the mounting disk protrusion form a protruding disk. The mounting disk protrusion passes through the central through hole of the clamping cylinder, and the protruding disk is located outside the clamping cylinder. The annular clamping washer is fitted onto the mounting disk protrusion through its own central through hole and is located in the annular groove. The inner diameter of the clamping washer is smaller than the inner diameter of the clamping cylinder, the outer diameter of the clamping washer is larger than the diameter of the central through hole of the driven gear disk, and the axial length of the annular groove is greater than the axial length of the clamping washer.
[0008] Preferably, in order to achieve the rapid rotation and positioning function of the chuck mounting plate, the indexing fixture further includes a positioning spring and a positioning ball. A positioning blind hole is provided in the bottom of the second circular groove near the central through hole of the indexing seat. The positioning spring and the positioning ball are placed in the positioning blind hole. A plurality of positioning grooves are provided on the first end face of the chuck mounting plate, which are evenly distributed along the circumference. The positioning grooves are spherical grooves and their maximum diameter is smaller than the outer diameter of the positioning ball. A portion of the positioning ball can be placed in each positioning groove in sequence during the rotation of the chuck mounting plate.
[0009] Preferably, in order to realize the function of axial movement of the locating pin in the indexing seat during the rotation of the driven gear disk and to facilitate processing and assembly, the slide rail connection structure includes an outwardly convex arc-shaped slide rail and an inwardly concave slide groove. The outwardly convex arc-shaped slide rail is provided on a section of the outer arc wall of the driven gear disk near the locating pin. The two ends of the outwardly convex arc-shaped slide rail are respectively located at the two axial ends of the driven gear disk. The inwardly concave slide groove is provided on the outer wall of the locating pin near its first end. The outwardly convex arc-shaped slide rail passes through the inwardly concave slide groove.
[0010] Preferably, in order to enable the clamping cylinder to move axially but not rotate circumferentially and to facilitate processing and assembly, the clamping cylinder has an outwardly protruding axial guide portion on its outer circumferential wall near the second circular recess, and the indexing seat has an inwardly recessed axial guide groove on its central through hole near the second circular recess, and the axial guide groove penetrates the bottom of the second circular recess, with the axial guide portion located inside the axial guide groove.
[0011] Preferably, to facilitate the installation of the clamping washer, the indexing fixture further includes a clamping ring. The clamping washer is formed by the mating of two semi-circular rings. The driven gear disk has a circular groove at one end away from the chuck mounting disk, and the circumferential wall of the circular groove has an internal thread. One end of the annular clamping ring is placed in the circular groove of the driven gear disk. The outer circumferential wall of the clamping ring has an external thread and is connected to the internal thread of the driven gear disk through the external thread. The clamping ring is fitted onto the clamping washer through its own central through hole.
[0012] Preferably, in order to improve the effect of using the clamping washer to axially clamp and position the chuck mounting plate, the surface of the clamping washer and the protruding cylindrical disk that come into contact with each other is a spherical or conical surface.
[0013] Preferably, a cover plate is installed on the outer side of the first circular settling tank.
[0014] Preferably, to facilitate alignment identification and processing, the alignment mark is an alignment line segment provided on the outer circumference of one side of the indexing seat, and the alignment line segment is parallel to the center line of the indexing seat.
[0015] Preferably, in order to facilitate the quick implementation of the sliding and fixing functions of the guide block, the guide groove is a "T" shaped groove, and the indexing seat is provided with a locking through hole. The locking screw passes through the locking through hole and connects to the guide block placed in the guide groove.
[0016] The beneficial effects of this utility model are as follows:
[0017] This invention, by adding an indexing fixture, utilizes the chuck mounting plate to rotate the chuck, thereby rotating the workpiece mounted on the chuck. This allows the countersunk hole position on the workpiece to be machined to be quickly rotated to a virtual straight line intersecting the rotation center line of the clamping seat and parallel to the length direction of the guide groove. Then, using the linear movement function between the indexing seat and the clamping seat, along with the scale lines and alignment marks, the countersunk hole position on the workpiece can be quickly moved to the rotation center line of the clamping seat. This achieves rapid and precise positioning of the countersunk hole position on the workpiece, realizing eccentric indexing clamping of the workpiece. The operation process is simple and convenient, with high positioning accuracy that does not rely on the operator's experience and skills, resulting in more stable and reliable positioning accuracy and improving the machining accuracy and efficiency of the workpiece. Furthermore, by designing mutually cooperating drive gears and driven gear discs within the indexing fixture... The locating pin, clamping cylinder, and clamping washer are operated by simply rotating the drive gear with a knob. This rotates the driven gear disc, which in turn moves the clamping cylinder and locating pin. The movement of the clamping cylinder creates a gap between the clamping washer and the convex disc. The movement of the locating pin disconnects the transmission connection between the chuck mounting plate and the indexing seat, allowing the chuck mounting plate to rotate relative to the indexing seat. After the chuck mounting plate is rotated to its correct position manually, rotating the knob in the opposite direction moves the clamping cylinder and locating pin in the opposite direction. This reverse movement of the clamping cylinder ensures tight contact between the clamping washer and the convex disc. The reverse movement of the locating pin establishes a rotational transmission connection between the chuck mounting plate and the indexing seat, ultimately achieving axial and circumferential positioning between the chuck mounting plate and the indexing seat. This enables the clamping seat to sequentially drive the indexing seat, chuck mounting plate, chuck, and workpiece to rotate, achieving the purpose of countersinking the workpiece's jaws. The operation is simple and convenient. Attached Figure Description
[0018] Figure 1 This is a three-dimensional view of the cylindrical body of a coupling;
[0019] Figure 2 This is a perspective view of the eccentric indexing clamping fixture for countersunk hole machining of the jaw end of the coupling body as described in this utility model.
[0020] Figure 3This is a front view of the eccentric indexing clamping fixture for countersunk hole machining of coupling cylinder jaws as described in this utility model;
[0021] Figure 4 This is a left view of the eccentric indexing clamping fixture for countersunk hole machining of coupling cylinder jaws as described in this utility model.
[0022] Figure 5 This is a perspective view of the eccentric indexing clamping fixture for countersunk hole machining of coupling cylinder jaws, as described in this utility model, after assembly of the indexing seat and chuck mounting plate.
[0023] Figure 6 This is a perspective view of the indexing seat and chuck mounting plate of the eccentric indexing clamping fixture for countersunk hole machining of coupling cylinder jaws described in this utility model before assembly;
[0024] Figure 7 This is a left sectional view of the indexing seat and chuck mounting plate of the eccentric indexing clamping fixture for countersunk hole machining of coupling cylinder jaws described in this utility model after assembly.
[0025] Figure 8 This is a left view of the eccentric indexing clamping fixture used in the machining of countersunk holes at the claw end of the coupling cylinder as described in this utility model. Detailed Implementation
[0026] The present invention will be further described below with reference to the accompanying drawings:
[0027] like Figures 2-7 As shown, the eccentric indexing clamping fixture for countersunk hole machining of coupling cylinder jaws according to this utility model includes a clamping seat 5, a chuck 12, and an indexing fixture. The indexing fixture includes a disc-shaped indexing seat 9 and a disc-shaped chuck mounting plate 11. One side plane of the clamping seat 5 is provided with a straight guide groove 6 (the number of guide grooves 6 is determined according to needs; there are 5 parallel ones in the figure), and the indexing seat 9 is mounted on this side plane. Near the edge of this side plane, there are scale lines 7 distributed along the length direction of the guide groove 6. The first end of the axial ends of the indexing seat 9 is provided with a guide block 14 (the number of guide blocks 14 is determined according to the needs). The guide block 14 is placed in the guide groove 6 and can slide and be fixed. The outer circumferential wall of the indexing seat 9 near the scale line 7 is provided with an alignment mark for aligning with the scale line 7. The first end of the axial ends of the chuck mounting plate 11 is installed at the second end of the axial ends of the indexing seat 9 and can rotate and be fixed relative to the indexing seat 9. The chuck 12 is installed at the second end of the axial ends of the chuck mounting plate 11.
[0028] like Figures 2-7 As shown, this utility model also discloses the following more optimized specific structures:
[0029] To enable the chuck mounting plate 11 to rotate and be fixed relative to the indexing seat 9 and to improve operational efficiency, the indexing fixture further includes a drive gear 21, a driven gear disc 20, a locating pin 19, a clamping cylinder 22, and a clamping washer 29. The first end face of the indexing seat 9 has a first circular groove (not marked in the figure), and the second end face has a second circular groove 24. A central through hole 25 is located at the center of the indexing seat 9, penetrating the center of the bottom of the first circular groove and the center of the bottom of the second circular groove 24. The first end of the chuck mounting plate 11 is placed inside the second circular groove 24, and the drive gear 21 is located near the edge inside the first circular groove. One end of the drive gear 21 is connected to… A knob 10 is attached, with its suspended end extending through a corresponding through hole on the indexing seat 9 and protruding outside the indexing seat 9 towards the second end of the indexing seat 9. The driven gear disk 20 is located in the center of the first circular recess. A plurality of teeth 18 are provided on a section of the outer circumference of the driven gear disk 20 near the driving gear 21, and these teeth mesh with the teeth of the driving gear 21. A section of the outer circumference of the driven gear disk 20 opposite to the driving gear 21 forms a slide rail connection structure with the first end of the two ends of the positioning pin 19. This slide rail connection structure allows the positioning pin 19 to move axially on the indexing seat 9 during the rotation of the driven gear disk 20. An indexing point is provided on the indexing seat 9 at a position corresponding to the positioning pin 19. The indexing seat positioning through hole 28 has two ends that pass through the bottom of the first circular countersunk groove and the bottom of the second circular countersunk groove 24, respectively. The chuck mounting plate 11 has mounting plate positioning through holes 15 at positions corresponding to the indexing seat positioning through hole 28. Multiple mounting plate positioning through holes 15 (four in the figure, the same number as the number of countersunk holes to be machined at the workpiece claw end) are evenly distributed circumferentially. The second end of the positioning pin 19 passes through the indexing seat positioning through hole 28 and is placed inside one of the mounting plate positioning through holes 15. The driven gear plate 20 has a central through hole with internal threads on its circumferential wall. The cylindrical clamping cylinder 22 passes through the indexing seat central through hole 25 and can move axially but cannot rotate circumferentially. The clamping cylinder 22... One end of the clamping cylinder 22 is placed in the central through hole of the driven gear disk 20, and the outer circumference of this end of the clamping cylinder 22 is provided with an external thread, which is connected to the internal thread of the driven gear disk 20 through the external thread. The first end face of the chuck mounting plate 11 axially protrudes outward to form a cylindrical mounting plate protrusion 32. The outer circumference of the mounting plate protrusion 32 is provided with an annular groove 33 near its suspended end, and the annular groove 33 makes the suspended end of the mounting plate protrusion 32 form a protruding disc 34. The mounting plate protrusion 32 passes through the central through hole of the clamping cylinder 22, and the protruding disc 34 is located outside the clamping cylinder 22. An annular clamping washer 29 is fitted onto the mounting plate protrusion 32 through its own central through hole and is located in the annular groove 33. The inner diameter of the clamping washer 29 is smaller than the inner diameter of the clamping cylinder 22.The outer diameter of the clamping washer 29 is larger than the diameter of the central through hole of the driven gear disk 20, and the axial length of the annular groove 33 is larger than the axial length of the clamping washer 29. Note: The above structure can be replaced by a simpler one: multiple positioning through holes are provided near the edge of the chuck mounting plate 11, and multiple positioning screws pass through these holes and connect to corresponding screw holes on the indexing seat. This structure is simple and practical, but it requires disassembling and reassembling the positioning screws each time the chuck mounting plate is rotated, making the operation cumbersome. Therefore, this invention adopts the simpler and faster structure described above.
[0030] To achieve the rapid rotation and positioning function of the chuck mounting plate 11, the indexing fixture also includes a positioning spring 31 and a positioning ball 26. A positioning blind hole (not marked in the figure) is provided in the bottom of the second circular countersunk groove 24 near the central through hole 25 of the indexing seat. The positioning spring 31 and the positioning ball 26 are placed in the positioning blind hole. Multiple (four in the figure, the same number as the number of countersunk holes to be machined at the workpiece claw end) positioning grooves (not marked in the figure) are provided on the first end face of the chuck mounting plate 11. The positioning grooves are spherical grooves and their maximum diameter is smaller than the outer diameter of the positioning ball 26. A portion of the positioning ball 26 can be placed in each positioning groove in sequence during the rotation of the chuck mounting plate 11.
[0031] To enable the locating pin 19 to move axially within the indexing seat 9 during the rotation of the driven gear disk 20 and to facilitate machining and assembly, the slide rail connection structure includes an outwardly convex arc-shaped slide rail 17 and an inwardly concave slide groove (not marked in the figure). The outwardly convex arc-shaped slide rail 17 is located on a section of the outer arc wall of the driven gear disk 20 near the locating pin 19. The two ends of the outwardly convex arc-shaped slide rail 17 are located at the two axial ends of the driven gear disk 20 (i.e., the outwardly convex arc-shaped slide rail 17 is spiral-shaped). The inwardly concave slide groove is located on the outer wall of the locating pin 19 near its first end, and the outwardly convex arc-shaped slide rail 17 passes through the inwardly concave slide groove.
[0032] In order to enable the clamping cylinder 22 to move axially but not rotate circumferentially and to facilitate processing and assembly, an outwardly protruding axial guide portion 23 is provided on the outer circumferential wall of the clamping cylinder 22 near the second circular groove 24. An inwardly recessed axial guide groove 27 is provided on the hole wall of the indexing seat center through hole 25 near the second circular groove 24, and the axial guide groove 27 penetrates the bottom of the second circular groove 24. The axial guide portion 23 is located inside the axial guide groove 27.
[0033] To facilitate the installation of the clamping washer 29, the indexing fixture also includes a clamping ring 30. The clamping washer 29 is formed by the mating of two semi-circular rings. The driven gear disk 20 has a circular groove at one end away from the chuck mounting disk 11, and the circumferential wall of the circular groove has an internal thread. One end of the annular clamping ring 30 is placed in the circular groove of the driven gear disk 20. The outer circumferential wall of the clamping ring 30 has an external thread and is connected to the internal thread of the driven gear disk 20 through the external thread. The clamping ring 30 is fitted onto the clamping washer 29 through its own central through hole.
[0034] To improve the axial clamping and positioning effect of the clamping washer 29 on the chuck mounting plate 11, the surfaces of the clamping washer 29 and the convex cylindrical disk 34 that come into contact with each other are spherical or conical.
[0035] A cover plate 16 is installed on the outer side of the first circular settling tank.
[0036] To facilitate alignment identification and processing, the alignment mark is an alignment line segment (not marked in the figure) provided on the outer circumference of one side of the indexing seat 9, and the alignment line segment is parallel to the center line of the indexing seat 9.
[0037] To facilitate the quick implementation of the sliding and fixing functions of the guide block 14, the guide groove 6 is a "T" shaped groove, and the indexing seat 9 is provided with a locking through hole. The locking screw (not shown in the figure) passes through the locking through hole and is connected to the guide block 14 placed in the guide groove 6.
[0038] Figure 2 , Figure 3 , Figure 4 and Figure 8 The image also shows a counterweight 8 mounted on the clamping base 5, which is a conventional adaptive structure.
[0039] like Figures 1-8 As shown, during processing, the central through hole 3 of the cylindrical body 1 is first machined on the cylindrical metal rod to form a cylindrical shape. Then, multiple cylindrical protrusions 2 are machined at one end to form the workpiece 35 with the countersunk hole 4 to be machined. The clamping seat 5 is installed on the machine tool and connected to the machine tool's rotating shaft. The center line of the machine tool's rotating shaft coincides with the rotation center line of the clamping seat 5. When clamping the workpiece 35, the workpiece 35 is installed on the chuck 12 and clamped by multiple jaws 13. According to the design of this clamping fixture, and by adjusting the relative position between the indexing seat 9 and the clamping seat 5, after the workpiece is installed, there will inevitably be a countersunk hole position to be machined located on the rotation center line of the clamping seat 5. After starting the machine tool, the machine tool's rotating shaft drives the clamping seat 5, the indexing seat 9, the chuck 12 and the workpiece 35 to rotate synchronously. The cutting tool is aligned with the countersunk hole position to be machined and gradually advanced, thus achieving the purpose of turning and machining the countersunk hole.
[0040] After machining one countersunk hole, the position of the next countersunk hole to be machined needs to be moved to the rotation center line of the clamping seat 5. The operation process is as follows: First, turn off the machine tool and remove the cutting tool. Then, drive the knob 10 to rotate using a tool (such as a socket wrench; the outer wall of the knob 10 has a corresponding polygonal structure). The knob 10 drives the drive gear 21 to rotate, which in turn drives the driven gear plate 20 to rotate, thereby driving the clamping cylinder 22 and the positioning pin 19 to move. The movement of the clamping cylinder 22 creates a gap between the clamping washer 29 and the convex disc 34. The movement of the positioning pin 19 disconnects the transmission connection between the chuck mounting plate 11 and the indexing seat 9, allowing the chuck mounting plate 11 to rotate relative to the indexing seat 9. Manually rotate the chuck mounting plate 11. After feeling and hearing the positioning ball 26 enter the next positioning groove on the chuck mounting plate 11, stop rotating. At this time, the position of the next countersunk hole to be machined will be in position. On the rotation center line of the clamping seat 5 (because the number of positioning grooves on the chuck mounting plate 11 is the same as the number of countersunk holes to be machined on the claw end of the workpiece 35, and they are all evenly distributed on the circumference, so the corresponding angles must be the same), rotate the knob 10 in the opposite direction. This will drive the clamping cylinder 22 and the positioning pin 19 to move in the opposite direction. The reverse movement of the clamping cylinder 22 makes the clamping washer 29 and the convex cylindrical disk 34 in close contact. The reverse movement of the positioning pin 19 makes the chuck mounting plate 11 and the indexing seat 9 achieve a rotational transmission connection. Finally, the chuck mounting plate 11 and the indexing seat 9 achieve axial and circumferential positioning. Then, the machine tool can be started, the cutting tool is aligned with the countersunk hole to be machined and gradually advanced to complete the turning of the countersunk hole. In the same way, until all the countersunk holes are turned, the workpiece 35 is then cut (if the length of the workpiece 17 is greater than the length of the cylinder 1, it needs to be cut). Figure 8 The displayed workpiece 35 and Figure 1 If the length of the simplified character 1 is the same as the displayed character, then no cutting, grinding, or polishing is required, and the result will be as shown. Figure 1 The cylindrical body 1 shown.
[0041] If the dimensions of the workpiece 35 to be processed change in the next process, the countersunk hole position to be processed at the claw end will no longer be located on the rotation center line of the clamping seat 5. In this case, it is necessary to first loosen the indexing seat 9 and the clamping seat 5, move the indexing seat 9, and precisely adjust its moving distance according to the scale line 7 (this moving distance is directly related to the diameter of different workpieces 35) so that one of the countersunk holes to be processed on the workpiece 35 is located on the rotation center line of the clamping seat 5. The subsequent countersunk hole processing procedure is the same as above.
[0042] By simply rotating the chuck using the chuck mounting plate, the workpiece mounted on the chuck is rotated, allowing the countersunk hole position on the workpiece to be machined to be quickly rotated to a virtual straight line that intersects the rotation center line of the clamping seat and is parallel to the length direction of the guide groove. Then, using the linear movement function between the indexing seat and the clamping seat, along with the scale lines and alignment marks, the countersunk hole position on the workpiece can be quickly moved to the rotation center line of the clamping seat. This achieves rapid and accurate positioning of the countersunk hole position on the workpiece, realizing eccentric indexing clamping of the workpiece. The operation process is simple and convenient, and the positioning accuracy does not depend on the operator's experience and skills, so the positioning accuracy is more stable and reliable, improving the machining accuracy and efficiency of the workpiece.
[0043] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.
Claims
1. An eccentric indexing clamping fixture for countersunk turning of the jaw end of a coupling cylinder, comprising a clamping seat and a chuck, characterized in that: It also includes an indexing fixture, which comprises a disc-shaped indexing seat and a disc-shaped chuck mounting plate. One side plane of the indexing seat is provided with a straight guide groove, and the indexing seat is mounted on the side plane. Near the edge of the side plane, there are scale lines distributed along the length direction of the guide groove. The first end of the two axial ends of the indexing seat is provided with a guide block. The guide block is placed in the guide groove and can slide and be fixed. The outer circumference of the indexing seat near the scale line is provided with an alignment mark for aligning with the scale line. The first end of the two axial ends of the chuck mounting plate is mounted on the second end of the two axial ends of the indexing seat and can rotate and be fixed relative to the indexing seat. The chuck is mounted on the second end of the two axial ends of the chuck mounting plate.
2. The eccentric indexing clamping fixture for countersunk hole machining of coupling cylinder jaws according to claim 1, characterized in that: The indexing fixture further includes a driving gear, a driven gear disc, a locating pin, a clamping cylinder, and a clamping washer. The first end face of the indexing seat has a first circular groove, and the second end face has a second circular groove. A central through hole is located at the center of the indexing seat, penetrating the center of the bottom of both the first and second circular grooves. The first end of the chuck mounting plate is placed within the second circular groove. The driving gear is located near the edge of the first circular groove. One end of the driving gear is connected to a knob, and the suspended end of the knob extends through a corresponding through hole on the indexing seat towards the second end of the indexing seat and protrudes from the groove. Outside the indexing seat, the driven gear disk is located in the middle of the first circular recess. A section of the outer circumference of the driven gear disk near the driving gear has multiple teeth that mesh with the teeth of the driving gear. A section of the outer circumference of the driven gear disk opposite the driving gear forms a slide rail connection with the first end of the locating pin. This slide rail connection allows the locating pin to move axially within the indexing seat during the rotation of the driven gear disk. The indexing seat has a locating through hole at a position corresponding to the locating pin, with both ends of the locating through hole passing through the bottom of the first circular recess and the first… The bottom of the two circular grooves has mounting plate positioning through holes on the chuck mounting plate corresponding to the positioning through holes of the indexing seat. Multiple mounting plate positioning through holes are evenly distributed circumferentially. The second end of the positioning pin passes through the indexing seat positioning through hole and is placed inside one of the mounting plate positioning through holes. The driven gear disc has a central through hole with internal threads on its circumferential wall. The cylindrical clamping cylinder passes through the central through hole of the indexing seat and can move axially but cannot rotate circumferentially. One end of the clamping cylinder is placed inside the central through hole of the driven gear disc, and the outer circumferential wall of that end of the clamping cylinder has external threads, which connect to the internal threads of the driven gear disc. The first end face of the chuck mounting plate has an axially outward protrusion forming a cylindrical mounting plate protrusion. An annular groove is provided on the outer circumference of the mounting plate protrusion near its suspended end, and this annular groove forms a protruding disc at the suspended end of the mounting plate protrusion. The mounting plate protrusion passes through the central through-hole of the clamping cylinder, and the protruding disc is located outside the clamping cylinder. The annular clamping washer is fitted onto the mounting plate protrusion through its own central through-hole and is located within the annular groove. The inner diameter of the clamping washer is smaller than the inner diameter of the clamping cylinder, and the outer diameter of the clamping washer is larger than the diameter of the central through-hole of the driven gear disc. The axial length of the annular groove is greater than the axial length of the clamping washer.
3. The eccentric indexing clamping fixture for countersunk hole machining of coupling cylinder jaws according to claim 2, characterized in that: The indexing fixture also includes a positioning spring and a positioning ball. A positioning blind hole is provided in the bottom of the second circular groove near the central through hole of the indexing seat. The positioning spring and the positioning ball are placed in the positioning blind hole. A plurality of positioning grooves are provided on the first end face of the chuck mounting plate, which are evenly distributed along the circumference. The positioning grooves are spherical grooves and their maximum diameter is smaller than the outer diameter of the positioning ball. A portion of the positioning ball can be placed in each positioning groove in sequence during the rotation of the chuck mounting plate.
4. The eccentric indexing clamping fixture for countersunk hole machining of coupling cylinder jaws according to claim 2, characterized in that: The slide rail connection structure includes an outwardly convex arc-shaped slide rail and an inwardly concave slide groove. The outwardly convex arc-shaped slide rail is located on a section of the outer arc wall of the driven gear disk near the positioning pin. The two ends of the outwardly convex arc-shaped slide rail are located at the two axial ends of the driven gear disk. The inwardly concave slide groove is located on the outer wall of the positioning pin near its first end. The outwardly convex arc-shaped slide rail passes through the inwardly concave slide groove.
5. The eccentric indexing clamping fixture for countersunk hole machining of coupling cylinder jaws according to claim 2, characterized in that: The outer circumferential wall of the clamping cylinder is provided with an outwardly protruding axial guide portion near the second circular recess, and the central through hole of the indexing seat is provided with an inwardly recessed axial guide groove near the second circular recess, and the axial guide groove penetrates the bottom of the second circular recess, with the axial guide portion located inside the axial guide groove.
6. The eccentric indexing clamping fixture for countersunk hole machining of coupling cylinder jaws according to claim 2, characterized in that: The indexing fixture also includes a clamping ring. The clamping washer is formed by joining two semi-circular rings together. The driven gear disk has a circular groove at one end away from the chuck mounting disk, and the circumferential wall of the circular groove has an internal thread. One end of the annular clamping ring is placed in the circular groove of the driven gear disk. The outer circumferential wall of the clamping ring has an external thread and is connected to the internal thread of the driven gear disk through the external thread. The clamping ring is fitted onto the clamping washer through its own central through hole.
7. The eccentric indexing clamping fixture for countersunk hole turning of coupling cylinder jaws according to any one of claims 2-6, characterized in that: The surfaces that come into contact between the compression washer and the convex disc are spherical or conical.
8. The eccentric indexing clamping fixture for countersunk hole turning of coupling cylinder jaws according to any one of claims 2-6, characterized in that: A cover plate is installed on the outside of the first circular settling tank.
9. The eccentric indexing clamping fixture for countersunk turning of the jaw end of a coupling body according to any one of claims 1-6, characterized in that: The alignment mark is an alignment line segment located on the outer circumference of one side of the indexing seat, and the alignment line segment is parallel to the center line of the indexing seat.
10. The eccentric indexing clamping fixture for countersunk turning of the jaw end of a coupling cylinder according to any one of claims 1-6, characterized in that: The guide groove is a "T" shaped groove, and the indexing seat is provided with a locking through hole. The locking screw passes through the locking through hole and connects to the guide block placed in the guide groove.