Annular part radial cutting clamp and cutting method

Abstract

The invention relates to the technical field of machining, in particular to an annular part radial cutting clamp and a cutting method.The clamp comprises a base, a rotating disc, a pressing plate and a flexible pad, the rotating disc is rotationally connected to the base and comprises a chassis, a limiting shaft and a limiting ring which are coaxially arranged, and the limiting shaft and the limiting ring are both fixedly connected to the upper surface of the chassis; an accommodating cavity is formed among the chassis, the limiting shaft and the limiting ring; the rotating disc is provided with a cutting groove in the radial direction of the limiting shaft, the flexible pad comprises a lower pad and an upper pad, the lower pad is arranged in the containing cavity, the upper pad is arranged at the upper end of a workpiece to be cut, the pressing plate is arranged above the upper pad and detachably connected with the limiting shaft, and the pressing plate and the flexible pad are provided with guide grooves corresponding to the cutting groove in the radial direction of the limiting shaft. And a reference groove corresponding to the cutting groove and the guide groove is formed in the base. The clamp is convenient and fast to clamp, stable and reliable in clamping and high in cutting precision, and the product percent of pass is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical processing, and in particular relates to a radial cutting fixture for an annular part and a cutting method. Background Art

[0002] In the aerospace and other fields, the demand for precision parts is getting higher and higher. In the radial cutting process of a ring part, such as Figure 1 As shown, firstly, a clamp is needed to clamp and fix the annular workpiece, and then radial cutting is performed by a wire saw.

[0003] Figure 1 This is a top view of the finished product of an annular workpiece. The process of this annular workpiece requires that the workpiece be cut into three petals along the radial direction and the inner diameter edge be rounded, that is, the wire saw does not move linearly along the radial direction of the annular tool. The upper and lower end faces of the annular workpiece are inclined surfaces, and the surface quality requirements are high. If the axial clamping force is applied to the inclined surfaces at the upper and lower ends of the annular workpiece, the contact area between the clamping plate and the two end faces of the annular workpiece is small, and the axial force is decomposed into radial force, which makes the part easy to become unstable and causes a slight change in position.

[0004] The existing cutting and clamping method usually uses a rigid three-jaw clamp to clamp the side wall of the annular workpiece. The three jaws of the three-jaw clamp are evenly distributed along the circumference of the annular workpiece. When one petal of the annular workpiece is cut off radially, the overall connection state of the annular workpiece suddenly changes, resulting in a change in its force. The positioning point of the rigid three-jaw clamp is separated from the original clamping force, and the disconnected petal becomes unstable, resulting in a slight change in the clamping position of the three-jaw clamp, and the cutting path changes accordingly. The shape of the final cut surface is inconsistent with the required shape, resulting in low yield and high production cost. Summary of the invention

[0005] The purpose of the present invention is to provide a radial cutting fixture and a cutting method for an annular workpiece, which is convenient and quick to clamp the annular workpiece, stable and reliable to clamp the annular workpiece, and has high cutting accuracy, high cutting efficiency and low production cost.

[0006] The above-mentioned object of the invention is achieved through the following technical solutions:

[0007] A radial cutting fixture for a ring-shaped part, comprising a base, a turntable, a pressing plate and a flexible pad. The turntable is rotatably connected to the base. The turntable includes a chassis, a limiting shaft and a limiting ring arranged coaxially. The limiting shaft and the limiting ring are both fixedly connected to the upper surface of the chassis. The limiting shaft is adapted to the inner diameter of the workpiece to be cut, and the inner diameter of the limiting ring is adapted to the outer diameter of the workpiece to be cut. An annular accommodating cavity is formed between the chassis and the limiting shaft and the limiting ring. The turntable is provided with a cutting groove for accommodating a wire saw along the radial direction of the limiting shaft. The flexible pad includes a lower pad and an upper pad. The lower pad is arranged in the accommodating cavity, the lower end of the workpiece to be cut is embedded in the accommodating cavity, the upper pad is arranged at the upper end of the workpiece to be cut, the pressing plate is arranged above the upper pad and is detachably connected to the limiting shaft. The pressing plate and the flexible pad are provided with guide grooves corresponding to the cutting groove along the radial direction of the limiting shaft, and the base is provided with a reference groove corresponding to the corresponding cutting groove and the guide groove.

[0008] In the above-mentioned radial cutting fixture for a ring-shaped part, a shaft hole is provided on the base, a rotating shaft adapted to the shaft hole is provided on the bottom surface of the chassis, the rotating shaft is coaxially arranged with the chassis, and the rotating shaft is rotatably connected in the shaft hole.

[0009] In the above-mentioned radial cutting fixture for a ring-shaped part, both the upper pad and the lower pad are annular. The lower surface of the lower pad is pasted to the chassis in the accommodating cavity, and the upper surface of the upper pad is pasted to the lower surface of the pressing plate.

[0010] In the above-mentioned radial cutting fixture for a ring-shaped part, a plurality of cutting grooves are uniformly distributed along the radial direction of the limiting shaft, and the inner end of the cutting groove extends into the limiting shaft.

[0011] In the above-mentioned radial cutting fixture for a ring-shaped part, the number of the cutting grooves is 3.

[0012] In the above-mentioned radial cutting fixture for a ring-shaped part, fixing holes are provided on the base, and countersunk head screws screwed to the workbench are arranged in the fixing holes.

[0013] In the above-mentioned radial cutting fixture for a ring-shaped part, the height of the limiting shaft is less than the height of the workpiece to be cut.

[0014] In the above-mentioned radial cutting fixture for a ring-shaped part, positioning holes are provided on the base, insertion holes are provided on the chassis along the circumferential direction, the number of the insertion holes is the same as that of the cutting grooves. When the reference groove corresponds to the corresponding cutting groove, the positioning holes correspond to the corresponding insertion holes and limiting pin rods are embedded in the corresponding positioning holes and insertion holes.

[0015] In the above-mentioned radial cutting fixture for a ring-shaped part, through holes are provided on the pressing plate, and fastening screws threadedly connected to the limiting shaft are arranged in the through holes.

[0016] A method for radially cutting a ring-shaped part, using the above-mentioned fixture for radially cutting a ring-shaped part, includes the following steps:

[0017] a. Installation of the base and the turntable

[0018] Fix the base on the wire saw workbench through the countersunk head screws passing through the fixing holes, rotatably connect the turntable to the base and align the cutting groove with the reference groove. At this time, the positioning hole on the base corresponds to the corresponding jack on the chassis, and insert the limit pin rod into the positioning hole and the jack.

[0019] b. Installation of the flexible pad

[0020] Paste the lower pad on the chassis in the accommodating cavity, and paste the upper pad on the bottom surface of the pressing plate.

[0021] c. Installation of the workpiece to be cut

[0022] Put the workpiece to be cut on the limit shaft, and make the lower end of the workpiece to be cut embed into the accommodating cavity and abut against the lower pad. Place the pressing plate on the upper end of the workpiece to be cut, and the upper pad abuts against the upper end of the workpiece to be cut. Clamp the workpiece to be cut tightly by connecting the pressing plate and the limit shaft through the fastening screw rod.

[0023] d. The wire saw makes a primary radial cut on the workpiece to be cut

[0024] The wire saw passes through the reference groove, the corresponding cutting groove and the corresponding guide groove to complete the primary radial cut of the workpiece to be cut.

[0025] e. The wire saw makes the remaining radial cuts on the workpiece to be cut

[0026] Remove the limit pin rod, rotate the turntable and make another corresponding cutting groove and guide groove correspond to the reference groove. At this time, the positioning hole corresponds to the corresponding jack, insert the limit pin rod into the positioning hole and the corresponding jack, and repeat the operations in steps a - d until the remaining radial cuts of the workpiece to be cut are completed.

[0027] In summary, the beneficial technical effects of the present invention are as follows:

[0028] Through the turntable rotating on the base and the flexible pads arranged at the upper and lower ends of the workpiece to be cut, the clamping of the workpiece to be cut is realized by connecting the pressing plate and the turntable; by setting a reference groove on the base, a cutting groove on the turntable, and guide grooves on the flexible pad and the pressing plate, and the positioning cooperation between the positioning hole and the jack, the precise positioning of the wire saw cutting channel is realized. This fixture is convenient and fast for clamping the ring-shaped workpiece, the ring-shaped workpiece is clamped stably and reliably, this fixture has high cutting precision and high cutting efficiency, and improves the product qualification rate. Description of the Drawings

[0029] Figure 1It is a top view of an existing annular workpiece cut into three petals along the radial direction;

[0030] Figure 2 It is a schematic structural diagram of the present invention;

[0031] Figure 3 It is a schematic exploded structural diagram of the present invention;

[0032] Figure 4 It is a schematic structural diagram of the turntable of the present invention.

[0033] As shown in the figure, 1. Base; 11. Reference groove; 12. Shaft hole; 13. Fixed hole; 14. Positioning hole; 2. Turntable; 21. Chassis; 211. Rotating shaft; 212. Insertion hole; 22. Limiting shaft; 23. Limiting ring; 24. Cutting groove; 3. Pressing plate; 4. Flexible pad; 41. Lower pad; 42. Upper pad; 5. Accommodation cavity; 6. Guide groove; 7. Limiting pin rod; 8. Tightening screw; 9. Workpiece to be cut. Specific embodiments

[0034] The following will further elaborate on the present invention in conjunction with the attached Figure 2-4 description.

[0035] Figure 1 It is a top view of an existing annular workpiece cut into three petals along the radial direction.

[0036] As Figure 2 、 3 shown, a radial cutting fixture for an annular part includes a base 1, a turntable 2, a pressing plate 3 and a flexible pad 4. The turntable 2 is rotatably connected to the base 1. The turntable 2 includes a chassis 21, a limiting shaft 22 and a limiting ring 23 arranged coaxially. The limiting shaft 22 and the limiting ring 23 are both fixedly connected to the upper surface of the chassis 21. The limiting shaft 22 is adapted to the inner diameter of the workpiece 9 to be cut, and the inner diameter of the limiting ring 23 is adapted to the outer diameter of the workpiece 9 to be cut. An annular accommodation cavity 5 is formed between the chassis 21 and the limiting shaft 22 and the limiting ring 23; the turntable 2 is provided with a cutting groove 24 for accommodating a wire saw along the radial direction of the limiting shaft 22. The flexible pad 4 includes a lower pad 41 and an upper pad 42. The lower pad 41 is arranged in the accommodation cavity 5. The lower end of the workpiece 9 to be cut is embedded in the accommodation cavity 5 and abuts against the lower pad 41. The upper pad 42 is arranged above the workpiece 9 to be cut. The pressing plate 3 is arranged above the upper pad 42 and is detachably connected to the limiting shaft 22. The pressing plate 3 and the flexible pad 4 are provided with guide grooves 6 corresponding to the cutting groove 24 along the radial direction of the limiting shaft 22. The base 1 is provided with a reference groove 11 corresponding to the corresponding cutting groove 24 and the guide groove 6.

[0037] The workpiece 9 to be cut uses the limit shaft 22 and the limit ring as the positioning reference, and fixes the workpiece 9 to be cut in an axial soft clamping manner, that is, flexible pads 4 are arranged at the upper and lower ends of the workpiece 9 to be cut. The elastic deformation characteristics of the flexible pads 4 are used to ensure the stability of the workpiece 9 to be cut caused by force deformation during cutting, and to ensure the radial cutting accuracy of the workpiece 9 to be cut.

[0038] As Figure 3 , 4 shown, the base 1 of this embodiment is provided with a shaft hole 12, and the bottom surface of the chassis 21 is provided with a rotating shaft 211 adapted to the shaft hole 12. The rotating shaft 211 is coaxially arranged with the chassis 21, and the rotating shaft 211 is rotatably connected in the shaft hole 12. Through the rotating mechanism, the turntable 2 can be rotated 360° on the base 1 to align the reference groove 11 with the corresponding cutting groove 24 and the guide groove 6, ensuring that the wire saw can pass through the reference groove 11, the cutting groove 24 and the guide groove 6 on the same plane to perform radial cutting on the workpiece to be cut.

[0039] As Figure 3 shown, in order to simplify the installation of the fixture and improve the cutting efficiency, in one embodiment, both the upper pad 42 and the lower pad 41 are annular. The upper pad 42 and the lower pad 41 are respectively provided with guide grooves 6 along the radial direction. The lower surface of the lower pad 41 is adhered to the chassis 21 in the accommodating cavity 5, and the upper surface of the upper pad 42 is adhered to the lower surface of the pressing plate 3. The guide grooves 6 on the upper pad 42 and the lower pad 41 correspond one by one to the guide grooves 6 on the pressing plate 3.

[0040] By arranging the upper pad 42 and the lower pad 41 at the upper and lower ends of the workpiece 9 to be cut, and the upper pad 42 and the lower pad 41 are made of flexible materials, such as rubber or silicone rubber. When the workpiece 9 to be cut becomes unstable due to splitting and cutting, the flexible pad 4 offsets the external force change of the workpiece 9 to be cut through elastic micro-deformation, ensuring that the workpiece 9 to be cut remains in a relatively stable state. The micro-deformation of rubber or silicone rubber material can be at the nanometer level, which is sufficient to meet the requirements for the dimensional accuracy of parts with micron-level accuracy requirements.

[0041] Using the flexible pad 4 can also reduce the risk of the workpiece 9 to be cut being clamped and damaged. The flexible pad 4 can be reused for a long time and is convenient to replace.

[0042] Compensate the elastic deformation of the flexible pad 4 into the unstable displacement of the workpiece 9 to be cut, ensure that the workpiece 9 to be cut cut radially still maintains a stress mode similar to the original clamping and fixing, and further ensure the stability of the part. When the wire saw cuts the workpiece 9 to be cut radially, the radial walking path can be curved, broken line, etc. according to production needs. The clamping method of this fixture for the workpiece 9 to be cut ensures the radial cutting accuracy of small precision annular parts.

[0043] As Figure 3As shown, a plurality of cutting grooves 24 are evenly distributed along the radial direction of the limiting shaft 22, and the inner side ends of the cutting grooves 24 extend into the limiting shaft 22. The cutting grooves 24 extend into the limiting shaft 22, which can leave space for the wire saw to cut, ensuring that the wire saw can smoothly perform the cutting operation along the radial direction of the workpiece 9 to be cut. In this embodiment, there are three cutting grooves 24, and the turntable 2 can be provided with different numbers of cutting grooves 24 according to different requirements for the workpiece 9 to be cut.

[0044] The extension line of the center line of the reference groove 11 of this embodiment passes through the center of the shaft hole 12, and the inner side end of the reference groove 11 coincides with the inner side end of the cutting groove 24 in vertical projection. This ensures that when the turntable 2 rotates on the base 1, the reference groove 11 and the cutting groove 24 are located in the same vertical plane, and can ensure that when the wire saw cuts the workpiece 9 to be cut, the base 1 and the wire saw are prevented from interfering with each other.

[0045] The inner end of the guide groove 6 on the pressing plate 3 also overlaps with the inner end of the cutting groove 24 in vertical projection, so as to avoid interference between the wire saw and the pressing plate 3 when cutting the workpiece 9 .

[0046] In order to fix the base 1 and ensure the cutting accuracy of the workpiece 9 to be cut, a fixing hole 13 is provided on the base 1. In this embodiment, two fixing holes 13 are provided, and countersunk screws threadedly connected to the workbench are provided in the fixing holes 13.

[0047] The height of the limiting shaft 22 is smaller than the height of the workpiece 9 to be cut, so that the pressing plate 3 can apply force to the workpiece 9 to be cut in the axial direction when connected to the limiting shaft 22 .

[0048] like Figure 3 As shown, a positioning hole 14 is provided on the base 1, and a socket 212 is provided along the circumferential direction of the chassis 21. The number of the sockets 212 is the same as the number of the cutting grooves 24. When the reference groove 11 corresponds to the corresponding cutting groove 24, the positioning hole 14 corresponds to the corresponding socket 212, and a limit pin 7 is embedded in the positioning hole 14 and the corresponding socket 212.

[0049] By rotating the turntable 2, the reference groove 11 on the base 1 corresponds to the corresponding cutting groove 24, and the cutting groove 24 also corresponds to the corresponding guide groove 6 on the flexible pad 4 and the pressure plate 3. At this time, the positioning hole 14 corresponds to the corresponding socket 212, and a limit pin 7 is embedded in the positioning hole 14 and the corresponding socket 212. The turntable 2 can be placed on the base 1 to rotate, thereby ensuring the cutting accuracy of the workpiece 9 to be cut.

[0050] The pressing plate 3 is provided with a through hole, and a fastening screw 8 is passed through the through hole and is threadedly connected with the limiting shaft 22. The pressing plate 3 is used to press and fasten the axis of the workpiece 9 to be cut.

[0051] The present invention discloses a method for radially cutting an annular member, using the above-mentioned radially cutting fixture for annular member, comprising the following steps:

[0052] a. Installation of the base and the turntable

[0053] Fix the base 1 on the wire saw workbench with a countersunk screw passing through the fixing hole 13. Rotationally connect the turntable 2 to the base 1 and align the cutting groove 24 with the reference groove 11. At this time, the positioning hole 14 on the base 1 corresponds to the corresponding jack 212 on the chassis 21. Insert the limit pin rod 7 into the positioning hole 14 and the jack 212.

[0054] b. Installation of the flexible pad

[0055] Paste the lower pad 41 on the chassis 21 inside the accommodating cavity 5, and paste the upper pad 42 on the bottom surface of the pressing plate 3.

[0056] c. Installation of the workpiece to be cut

[0057] Set the workpiece to be cut 9 on the limit shaft 22, and make the lower end of the workpiece to be cut 9 embed into the accommodating cavity 5 and abut against the lower pad 41. Place the pressing plate 3 on the upper end of the workpiece to be cut 9, and the upper pad 42 abuts against the upper end of the workpiece to be cut 9. Press the pressing plate 3 and the limit shaft 22 together with the fastening screw rod 8 to clamp the workpiece to be cut 9.

[0058] d. The wire saw makes a first radial cut on the workpiece to be cut

[0059] The wire saw passes through the reference groove 11, the corresponding cutting groove 24 and the corresponding guide groove 6 to complete the first radial cut of the workpiece to be cut 9.

[0060] e. The wire saw makes the remaining radial cuts on the workpiece to be cut 9

[0061] Remove the limit pin rod 7, rotate the turntable 2 and make another corresponding cutting groove 24 and the guide groove 6 correspond to the reference groove 11. At this time, the positioning hole 14 corresponds to the corresponding jack 212. Insert the limit pin rod 7 into the positioning hole 14 and the corresponding jack 212, and repeat the operations in steps a - d until the remaining radial cuts of the workpiece to be cut 9 are completed.

[0062] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A radial cutting fixture for annular parts, characterized in that, it includes a base, a turntable, a pressing plate and a flexible pad. The turntable is rotatably connected to the base. The turntable includes a chassis, a limiting shaft and a limiting ring arranged coaxially. The limiting shaft and the limiting ring are both fixedly connected to the upper surface of the chassis. The limiting shaft is adapted to the inner diameter of the workpiece to be cut, and the inner diameter of the limiting ring is adapted to the outer diameter of the workpiece to be cut. An annular accommodating cavity is formed between the chassis and the limiting shaft and the limiting ring; a cutting groove for accommodating a wire saw is formed in the turntable along the radial direction of the limiting shaft. The flexible pad includes a lower pad and an upper pad. The lower pad is arranged in the accommodating cavity, the lower end of the workpiece to be cut is embedded in the accommodating cavity, the upper pad is arranged at the upper end of the workpiece to be cut, the pressing plate is arranged above the upper pad and is detachably connected to the limiting shaft. The pressing plate and the flexible pad are provided with guide grooves corresponding to the cutting groove along the radial direction of the limiting shaft, and a reference groove corresponding to the corresponding cutting groove and the guide groove is formed in the base.

2. The radial cutting fixture for annular parts according to claim 1, characterized in that, a shaft hole is formed in the base, a rotating shaft adapted to the shaft hole is formed on the bottom surface of the chassis, the rotating shaft is coaxially arranged with the chassis, and the rotating shaft is rotatably connected in the shaft hole.

3. The radial cutting fixture for annular parts according to claim 1, characterized in that, both the upper pad and the lower pad are annular, the lower surface of the lower pad is pasted to the chassis in the accommodating cavity, and the upper surface of the upper pad is pasted to the lower surface of the pressing plate.

4. The radial cutting fixture for annular parts according to claim 1, characterized in that, a plurality of cutting grooves are uniformly distributed along the radial direction of the limiting shaft, and the inner end of the cutting groove extends into the limiting shaft.

5. The radial cutting fixture for annular parts according to claim 4, characterized in that, the number of the cutting grooves is 3.

6. The radial cutting fixture for annular parts according to claim 1, characterized in that, a fixing hole is formed in the base, and a countersunk head screw screwed to the workbench is arranged in the fixing hole.

7. The radial cutting fixture for annular parts according to claim 1, characterized in that, the height of the limiting shaft is less than the height of the workpiece to be cut.

8. The radial cutting fixture for annular parts according to claim 1, characterized in that, a positioning hole is formed in the base, a jack is formed on the chassis along the circumferential direction, the number of the jacks is the same as that of the cutting grooves. When the reference groove corresponds to the corresponding cutting groove, the positioning hole corresponds to the corresponding jack and a limiting pin rod is embedded in the positioning hole and the corresponding jack.

9. The radial cutting fixture for annular parts according to claim 1, characterized in that, a through hole is formed in the pressing plate, and a fastening screw threadedly connected to the limiting shaft is arranged in the through hole.

10. A method for radially cutting an annular part, using the radial cutting fixture for annular parts according to any one of claims 1-9, characterized in that, it includes the following steps: a. Installation of the base and the turntable Fix the base on the wire saw workbench through the countersunk head screw passing through the fixing hole, rotatably connect the turntable to the base and align the cutting groove with the reference groove. At this time, the positioning hole on the base corresponds to the corresponding jack on the chassis, and insert the limiting pin rod into the positioning hole and the jack. b. Installation of the flexible pad Paste the lower pad on the chassis in the accommodating cavity, and paste the upper pad on the bottom surface of the pressing plate; c. Installation of the workpiece to be cut Set the workpiece to be cut on the limiting shaft, and make the lower end of the workpiece to be cut embed into the accommodating cavity and abut against the lower pad. Place the pressing plate on the upper end of the workpiece to be cut, and the upper pad abuts against the upper end of the workpiece to be cut. Press the workpiece to be cut tightly by connecting the pressing plate and the limiting shaft with a fastening screw; d. The wire saw makes a first radial cut on the workpiece to be cut The wire saw passes through the reference slot, the corresponding cutting slot and the corresponding guide slot to complete the first radial cut of the workpiece to be cut; e. The wire saw makes the remaining radial cuts on the workpiece to be cut Remove the limit pin rod, rotate the turntable to make another corresponding cutting slot and guide slot correspond to the reference slot. At this time, the positioning hole corresponds to the corresponding jack hole. Insert the limit pin rod into the positioning hole and the corresponding jack hole, and repeat the operations in steps a - d until the remaining radial cuts of the workpiece to be cut are completed.

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