A special fixture and grinder for cutting internal thread

Abstract

The application provides a special clamp and grinding machine for internal thread cutting, and relates to the technical field of machining equipment, and solves the technical problems of limited precision and low production efficiency in the prior art. The device comprises a pressure cylinder, a connecting seat, a rotating main shaft, a chuck, a pull ring, a reset piece, a collet, an internal taper pull ring and a pull rod. The pressure rod of the pressure cylinder is provided with a pushing part, the pushing part abuts against the pull ring, the pull ring is connected with the internal taper pull ring through the pull rod, the internal taper pull ring is sleeved on the collet, the internal taper surface of the internal taper pull ring is matched with the external taper surface of the collet, a strip hole is arranged on the internal taper pull ring, a positioning hole for positioning the machining hole on the nut workpiece is arranged on the collet, and the strip hole is communicated with the positioning hole. The positioning pin can be inserted into the positioning hole to be positioned with the nut workpiece, the internal taper pull ring is driven to move relative to the collet by the pressure cylinder, and then the collet clamps the nut. This way has high precision and greatly improves the positioning efficiency.

Description

Technical Field

[0001] This invention relates to the field of machining equipment technology, and in particular to a special fixture and grinding machine for internal thread cutting. Background Technology

[0002] A thread grinding machine is a machine tool that uses a shaped grinding wheel as an abrasive to machine precision threads. Currently, the clamps on thread grinding machines often use hydraulic chucks to hold nuts. However, these hydraulic chucks pull the workpiece back during clamping, causing axial movement. To ensure accurate subsequent machining, sensors are needed to locate the hook inside the nut for positioning. This method has limited accuracy and low production efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a special fixture and grinding machine for internal thread cutting, which solves the problems of limited accuracy and low production efficiency in the prior art. The various technical effects of the preferred technical solutions provided by this invention are detailed below.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] The present invention provides a special fixture for internal thread cutting, comprising a pressure cylinder, a connecting seat, a rotary spindle, a chuck, a pull ring, a reset component, a collet, an inner tapered pull ring, and a pull rod. The pressure cylinder is disposed at the tail end of the rotary spindle via the connecting seat. The chuck is disposed at the head end of the rotary spindle. The chuck has an installation space, within which the pull ring is slidably disposed. A reset component is disposed between the pull ring and the chuck. One end of the collet is connected to the chuck, and the other end has an outer tapered surface. The inner tapered pull ring... A ring is fitted onto the chuck, and the inner tapered surface of the inner tapered pull ring mates with the outer tapered surface of the chuck. The pull ring and the inner tapered pull ring are connected by the pull rod. The pressure rod of the pressure cylinder passes through the connecting seat, the rotating spindle, and the pull ring in sequence and extends into the chuck. The pressure rod has a pushing part, which abuts against the pull ring. The inner tapered pull ring is provided with a slotted hole, and the chuck is provided with a positioning hole for positioning with the machined hole on the nut workpiece. The slotted hole communicates with the positioning hole.

[0006] Preferably, the connecting seat is provided with a thrust bearing and a rotary connecting shaft. The rotary connecting shaft has an annular protrusion on the outside. The thrust bearing is respectively provided on both sides of the annular protrusion. One end of the rotary connecting shaft is connected to the tail end of the rotary main shaft. The pressure rod passes through the rotary connecting shaft.

[0007] Preferably, there are multiple pull rods, and the chuck is provided with a through hole, in which the pull rod is slidably disposed.

[0008] Preferably, it further includes a top sleeve, which is sleeved on the pressure rod, and a pull ring is disposed on the top sleeve. The pull ring is axially limited and connected to the top sleeve, and the top sleeve abuts against the pushing part.

[0009] Preferably, the reset element is a butterfly spring, which is sleeved on the top sleeve, with one end of the butterfly spring abutting against the pull ring and the other end abutting against the inner wall of the chuck.

[0010] Preferably, it further includes a pressure spring, which is located within the top sleeve and the clamp and is slidably sleeved on the pressure rod.

[0011] The grinding machine provided by the present invention includes the above-mentioned special fixture for internal thread cutting.

[0012] Preferably, it further includes a grinding wheel drive mechanism and a grinding wheel dressing mechanism. The grinding wheel drive mechanism is disposed on one side of the chuck end of the special fixture, and the grinding wheel dressing mechanism and the special fixture are both disposed on the first translation mechanism.

[0013] Preferably, the grinding wheel drive mechanism includes a second translation mechanism, a mounting frame, a grinding wheel head connector, and a drive motor. The translation direction of the second translation mechanism is perpendicular to the translation direction of the first translation mechanism. The mounting frame is disposed on the second translation mechanism, the grinding wheel head connector is disposed on the mounting frame, and the drive motor is disposed on the grinding wheel head connector.

[0014] Preferably, the grinding wheel dressing mechanism includes a fixed frame, a rotary motor, a rotating plate, and a grinding wheel dressing machine. The fixed frame is mounted on the first translation mechanism, the rotary motor is mounted on the fixed frame, the output end of the rotary motor is connected to the rotating plate, the rotating plate is oscillatingly connected to the fixed frame, and the grinding wheel dressing machine is mounted on the rotating plate.

[0015] The application employs the above technical solution and has at least the following beneficial effects:

[0016] The specialized fixture for internal thread cutting includes a pressure cylinder, a connecting seat, a rotary spindle, a chuck, a pull ring, a reset component, a collet, an inner tapered pull ring, and a pull rod. The pressure rod of the pressure cylinder passes sequentially through the connecting seat, the rotary spindle, and the pull ring into the collet. The pressure rod has a pushing part that abuts against the pull ring. The pull ring and the inner tapered pull ring are connected by the pull rod. The inner tapered pull ring is fitted onto the collet, and the inner tapered surface of the inner tapered pull ring mates with the outer tapered surface of the collet. The inner tapered pull ring has a slotted hole, and the collet has a positioning hole for positioning with the machined hole on the nut workpiece. The slotted hole communicates with the positioning hole. This invention allows for the insertion of a positioning pin into the positioning hole to position the nut workpiece. This prevents axial movement of the nut workpiece during subsequent clamping operations. The pressure cylinder drives the inner tapered pull ring to move relative to the collet, thereby clamping the nut. This method offers high precision and significantly improved positioning efficiency.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is an exploded view of the special fixture for internal thread cutting provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the overall structure of the special fixture for internal thread cutting provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the special fixture for internal thread cutting to remove the rotating spindle structure provided in the embodiment of the present invention;

[0022] Figure 4 This is a cross-sectional view of the special fixture for internal thread cutting provided in this embodiment of the invention for removing the rotating spindle;

[0023] Figure 5 This is a schematic diagram of the grinding machine structure provided in an embodiment of the present invention.

[0024] In the diagram: 1. Pressure cylinder; 2. Connecting seat; 3. Rotary spindle; 4. Chuck; 5. Pull ring; 6. Reset component; 7. Chuck; 8. Inner tapered pull ring; 9. Pull rod; 10. Pressure rod; 11. Pushing part; 12. Slot hole; 13. Positioning hole; 14. Thrust bearing; 15. Rotary connecting shaft; 16. Ring protrusion; 17. Through hole; 18. Top sleeve; 19. Pressure spring; 20. First translation mechanism; 21. Second translation mechanism; 22. Mounting bracket; 23. Grinding wheel head connector; 24. Drive motor; 25. Fixing bracket; 26. Rotary motor; 27. Rotary plate; 28. Grinding wheel dressing machine. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0026] A specific embodiment of the present invention provides a special fixture for internal thread cutting, combined with an attached... Figure 1 - Appendix Figure 4 As shown, it mainly includes a pressure cylinder 1, a connecting seat 2, a rotating spindle 3, a chuck 4, a pull ring 5, a reset component 6, a collet 7, an inner tapered pull ring 8, and a pull rod 9.

[0027] The pressure cylinder 1 is mounted at the tail end of the rotating spindle 3 via a connecting seat 2, and the chuck 4 is mounted at the head end of the rotating spindle 3. The chuck 4 has an installation space, and an installation groove is provided on the end face of the chuck 4 facing the rotating spindle 3. When the chuck 4 is mounted on the rotating spindle 3, the installation groove forms this installation space. A pull ring 5 is slidably mounted within the installation space. The pull ring 5 is an annular structure and is coaxially mounted with the chuck 4. A reset element 6 is provided between the pull ring 5 and the chuck 4. The reset element 6 can drive the pull ring 5 to return to its initial position. One end of the head 7 is connected to the chuck 4, and the other end has an outer tapered surface. One end of the outer tapered surface of the chuck 7 has at least three notches so that this end can be tightened to clamp the nut. The inner tapered pull ring 8 is sleeved on the chuck 7. The inner tapered surface of the inner tapered pull ring 8 is engaged with the outer tapered surface of the chuck 7. The pull ring 5 is connected to the inner tapered pull ring 8 through the pull rod 9. Thus, under the action of the pull ring 5, the inner tapered pull ring 8 can be driven to move axially. Then, through the engagement between the inner tapered pull ring 8 and the chuck 7, the chuck 7 can clamp the nut.

[0028] Therefore, in this application, the pressure rod 10 of the pressure cylinder 1 passes through the connecting seat 2, the rotating spindle 3 and the pull ring 5 in sequence and extends into the chuck 7. The pressure rod 10 has a pushing part 11, which abuts against the pull ring 5. The pushing of the pressure rod 10 can drive the pull ring 5 to move, thereby driving the inner tapered pull ring 8 to move axially. Then, through the cooperation between the inner tapered pull ring 8 and the chuck 7, the chuck 7 can loosen the nut workpiece.

[0029] When the pressure rod 10 retracts in the pressure cylinder 1, the reset member 6 will drive the pull ring 5 to move, which in turn will drive the inner tapered pull ring 8 to move axially. Then, through the cooperation between the inner tapered pull ring 8 and the chuck 7, the chuck 7 will clamp the nut workpiece.

[0030] The inner tapered pull ring 8 is provided with a slotted hole 12, and the chuck 7 is provided with a positioning hole 13 for positioning with the machined hole on the nut workpiece. The slotted hole 12 and the positioning hole 13 are connected. Before being driven by the pressure cylinder 1, the positioning pin is first inserted into the machined hole on the nut workpiece through the slotted hole 12 and the positioning hole 13 to achieve positioning. This ensures that the nut workpiece will not have relative displacement with the chuck 7 during the clamping process when the pressure rod 10 retracts from the pressure cylinder 1, thereby ensuring clamping accuracy. Moreover, this positioning and clamping method in this application is more accurate and faster than the traditional method of clamping first and then using a sensor to find the hook to position the inside of the nut, thus improving production efficiency.

[0031] In a specific embodiment of this application, a thrust bearing 14 and a rotary connecting shaft 15 are provided inside the connecting seat 2. The rotary connecting shaft 15 has an annular protrusion 16 on its outside. Thrust bearings 14 are respectively provided on both sides of the annular protrusion 16. One end of the rotary connecting shaft 15 is connected to the tail end of the rotary main shaft 3. The pressure rod 10 passes through the rotary connecting shaft 15. In this way, when the rotary main shaft 3 rotates, it can only rotate the rotary connecting shaft 15, and will not cause the connecting seat 2, the pressure cylinder 1 and the pressure rod 10 to rotate. The pressure rod 10 will only move axially under the drive of the pressure cylinder 1.

[0032] In some embodiments, there are multiple pull rods 9, which are evenly arranged along the circumference of the pull ring 5 and the inner tapered pull ring 8, thus ensuring the connection strength between the pull ring 5 and the inner tapered pull ring 8, thereby ensuring that the two can move stably and synchronously along the axial direction. The chuck 4 is provided with a through hole 17, and the pull rod 9 is slidably arranged in the through hole 17.

[0033] In some embodiments, a top sleeve 18 is further included. The top sleeve 18 is sleeved on the pressure rod 10, and there is a gap between the top sleeve 18 and the pressure rod 10 to ensure that the chuck 4 will not affect the pressure rod 10 when rotating. A pull ring 5 is disposed on the top sleeve 18 and is axially limited to the top sleeve 18. The top sleeve 18 abuts against the pushing part 11. The pushing part 11 may be a stepped part on the pressure rod 10. The diameter of the pressure rod 10 passing through the top sleeve 18 becomes smaller, thereby forming a stepped part on the outside of the top sleeve 18. In this way, the pressure rod 10 can push the top sleeve 18 to move when moving axially, thereby driving the pull ring 5 to move.

[0034] In some embodiments, the reset member 6 is a butterfly spring, which is sleeved on the top sleeve 18. One end of the butterfly spring abuts against the pull ring 5 and the other end abuts against the inner wall of the chuck 4. The butterfly spring can store force when the pressure rod 10 pushes the top sleeve 18 to drive the pull ring 5 to move. When the pressure rod 10 retracts, it will release force to drive the pull ring 5 back to its original position.

[0035] In some embodiments, a pressure spring 19 is also included. The pressure spring 19 is located inside the top sleeve 18 and the chuck 7 and is slidably sleeved on the pressure rod 10. The arrangement of the pressure spring 19 can prevent the nut workpiece from being inserted too deeply into the chuck 7.

[0036] In some embodiments, the pressure rod 10 is a hollow tube structure, with one end of the pressure rod 10 serving as the water inlet and the other end of the chuck 7 serving as the water outlet. This allows water to be supplied through the hollow pressure rod 10 during processing to cool the workpiece.

[0037] A specific embodiment of the present invention provides a grinding machine, including the aforementioned special fixture for internal thread cutting, and specifically also includes a grinding wheel drive mechanism and a grinding wheel dressing mechanism. The grinding wheel drive mechanism is disposed on one side of the chuck 4 end of the special fixture, and the grinding wheel dressing mechanism and the special fixture are both disposed on the first translation mechanism 20. The grinding wheel drive mechanism is used to install and drive the grinding wheel to rotate, thereby realizing the grinding of the internal threads of the nut workpiece; while the grinding wheel dressing mechanism is used to correct the grinding wheel, thereby ensuring that the grinding wheel can perform precise machining.

[0038] In some embodiments, as shown in the appendix Figure 5As shown, the grinding wheel drive mechanism includes a second translation mechanism 21, a mounting frame 22, a grinding wheel head connector 23, and a drive motor 24. The translation direction of the second translation mechanism 21 is perpendicular to the translation direction of the first translation mechanism 20. The second translation mechanism 21 drives the mechanism on it to move towards or away from the special fixture for internal thread cutting. The mounting frame 22 is mounted on the second translation mechanism 21, the grinding wheel head connector 23 is mounted on the mounting frame 22, and the drive motor 24 is mounted on the grinding wheel head connector 23. The grinding wheel dressing mechanism includes a fixed frame 25, a rotary motor 26, a rotating plate 27, and a grinding wheel dresser 28. The fixed frame 25 is mounted on the first translation mechanism 20, and the rotary motor 26 is mounted on the fixed frame 25. The output end of the rotary motor 26 is connected to the rotating plate 27. The rotating plate 27 and the fixed frame 25 are oscillatingly connected. The grinding wheel dresser 28 is mounted on the rotating plate 27. The rotary motor 26 can drive the angle of the grinding wheel dresser 28 to change, thereby ensuring accurate dressing of the grinding wheel.

[0039] Both the second translation mechanism 21 and the first translation mechanism 20 are linear drive mechanisms. For example, they can be driven by a lead screw motor to move the lead screw nut, or other mechanisms such as hydraulic cylinders or pneumatic cylinders that can achieve linear drive can be used.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0041] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," and "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A special fixture for internal thread cutting, characterized in that, The device includes a pressure cylinder, a connecting seat, a rotating spindle, a chuck, a pull ring, a reset component, a collet, an inner tapered pull ring, and a pull rod. The pressure cylinder is mounted at the tail end of the rotating spindle via the connecting seat. The chuck is mounted at the head end of the rotating spindle and has an installation space. The pull ring is slidably mounted within the installation space. A reset component is positioned between the pull ring and the chuck. One end of the collet is connected to the chuck, and the other end has an outer tapered surface. The inner tapered pull ring is sleeved on the collet, and the inner tapered surface of the inner tapered pull ring mates with the outer tapered surface of the collet. The pull ring and the inner tapered pull ring are connected by the pull rod. The pressure rod of the pressure cylinder passes sequentially through the connecting seat, the rotating spindle, and the pull ring and extends into the collet. The pressure rod has a pushing part that abuts against the pull ring. The inner tapered pull ring has a slotted hole. The collet has a positioning hole for positioning with a machined hole on a nut workpiece, and the slotted hole communicates with the positioning hole. The connecting seat is provided with a thrust bearing and a rotary connecting shaft. The rotary connecting shaft has an annular protrusion on the outside. The thrust bearing is respectively provided on both sides of the annular protrusion. One end of the rotary connecting shaft is connected to the tail end of the rotary main shaft. The pressure rod passes through the rotary connecting shaft.

2. The special fixture for internal thread cutting according to claim 1, characterized in that, The number of pull rods is multiple, and the chuck is provided with through holes, in which the pull rods are slidably disposed.

3. The special fixture for internal thread cutting according to claim 1, characterized in that, It also includes a top sleeve, which is fitted onto the pressure rod, and a pull ring is disposed on the top sleeve. The pull ring is axially limited and connected to the top sleeve, and the top sleeve abuts against the pushing part.

4. The special fixture for internal thread cutting according to claim 3, characterized in that, The reset component is a butterfly spring, which is sleeved on the top sleeve. One end of the butterfly spring abuts against the pull ring, and the other end abuts against the inner wall of the chuck.

5. The special fixture for internal thread cutting according to claim 4, characterized in that, It also includes a pressure spring, which is located inside the top sleeve and the clamp and is slidably sleeved on the pressure rod.

6. A grinding machine, characterized in that, Includes a special fixture for internal thread cutting as described in any one of claims 1 to 5.

7. The grinding machine according to claim 6, characterized in that, It also includes a grinding wheel drive mechanism and a grinding wheel dressing mechanism. The grinding wheel drive mechanism is located on one side of the chuck end of the special fixture, and the grinding wheel dressing mechanism and the special fixture are both located on the first translation mechanism.

8. The grinding machine according to claim 7, characterized in that, The grinding wheel drive mechanism includes a second translation mechanism, a mounting frame, a grinding wheel head connector, and a drive motor. The translation direction of the second translation mechanism is perpendicular to the translation direction of the first translation mechanism. The mounting frame is mounted on the second translation mechanism, the grinding wheel head connector is mounted on the mounting frame, and the drive motor is mounted on the grinding wheel head connector.

9. The grinding machine according to claim 7, characterized in that, The grinding wheel dressing mechanism includes a fixed frame, a rotary motor, a rotating plate, and a grinding wheel dressing machine. The fixed frame is mounted on the first translation mechanism, the rotary motor is mounted on the fixed frame, the output end of the rotary motor is connected to the rotating plate, the rotating plate is oscillatingly connected to the fixed frame, and the grinding wheel dressing machine is mounted on the rotating plate.

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