Liquid expansion sleeve tool for gear shaping machining and using method of liquid expansion sleeve tool

Abstract

The invention discloses a liquid expansion sleeve tool for gear shaping machining and a using method of the liquid expansion sleeve tool. The liquid expansion sleeve tool comprises a tool body, an inner hole is formed in the tool body, a lower positioning sleeve and a thin-wall sleeve are arranged in the inner hole, a thin-wall section is arranged on the thin-wall sleeve, an annular pressure cavity is formed in the periphery of the thin-wall section, and a pressure medium is arranged in the annular pressure cavity; the tool body is provided with a pressurizing mechanism used for pressurizing a pressure medium in the annular pressure cavity. When a workpiece is clamped, the workpiece is placed at the upper end of the lower positioning sleeve and located on the inner side of the upper thin-wall section of the thin-wall sleeve. According to the invention, when the pressure medium in the annular pressure cavity is pressurized, the pressure medium applies inward pressure to the thin-wall section, and the thin-wall section deforms towards the inner side under the pressure action of the pressure medium; the workpiece on the inner side is tightly held by the thin-wall section through deformation of the thin-wall section, so that the fit clearance between the workpiece and the thin-wall section is eliminated, and the machining precision is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of gear shaping, and in particular to a liquid expansion sleeve tooling used for gear shaping and a use method thereof. Background Art

[0002] The structure of an existing workpiece is as follows Figure 1 As shown, the workpiece 1 is in a circular ring shape. When the workpiece 1 is processed, an internal gear structure needs to be processed on the internal gear processing annular surface 1 a on the inner side of the workpiece 1 through a gear shaping process.

[0003] During processing, the workpiece 1 needs to be fixed on the tooling first, and then the gear shaping cutter on the gear shaping machine moves up and down to cut the inner side of the workpiece 1 and form the internal gear structure. The tooling is provided with a tooling inner hole that matches the outer circle of the workpiece 1. When clamping the workpiece 1, the workpiece 1 is placed in the tooling inner hole to achieve positioning of the workpiece 1, and then the workpiece 1 is clamped by the clamping mechanism on the tooling.

[0004] However, since there is a certain radial fit clearance between the inner hole of the tooling and the outer circle of the workpiece 1, the range of the radial fit clearance is usually between 0.02mm and 0.03mm; and in the actual processing process, the gear cutter will exert a large force on the workpiece 1 during the up and down movement. Under the force of the slot cutter, the workpiece 1 is prone to radial movement, resulting in the processing accuracy being affected. Summary of the invention

[0005] The purpose of the present invention is to solve the deficiencies in the prior art and to provide a liquid expansion tool for gear shaping and a method of using the same.

[0006] The object of the present invention is achieved through the following technical solutions: a liquid expansion sleeve tool for gear shaping, comprising a tool body, an inner hole is provided on the tool body, a lower positioning sleeve and a thin-walled sleeve are provided in the inner hole, a thin-walled section is provided on the thin-walled sleeve, an annular pressure chamber is provided on the periphery of the thin-walled section, and a pressure medium is provided in the annular pressure chamber; a pressurizing mechanism for pressurizing the pressure medium in the annular pressure chamber is provided on the tool body;

[0007] When clamping the workpiece, the workpiece is placed on the upper end of the lower positioning sleeve and is located on the inner side of the thin-walled section of the thin-walled sleeve; when the pressure medium in the annular pressure chamber is pressurized, the thin-walled section deforms inward and holds the workpiece tightly.

[0008] Preferably, the pressurizing mechanism comprises a first piston chamber arranged on the tooling body, one end of which is connected to the annular pressure chamber; a first piston body is arranged in the first piston chamber, and a pushing mechanism for pushing the first piston body to move is arranged at one end of the first piston body.

[0009] Preferably, the pushing mechanism comprises a threaded sleeve connected to the tooling body, a clamping screw is connected to the threaded sleeve, and the clamping screw and the threaded sleeve are threadably matched; one end of the clamping screw is in contact with the first piston body.

[0010] Preferably, the thin-walled sleeve further comprises connecting sections arranged at both ends of the thin-walled section, and the connecting sections are interference fit with the inner hole on the tooling body.

[0011] Preferably, the lower positioning sleeve is connected to the tooling body via connecting screws.

[0012] Preferably, the wall thickness of the thin-walled section is 1.2-1.5 mm, and when the pressure medium is not pressurized, the fitting clearance between the thin-walled section and the workpiece is 0.03-0.04 mm.

[0013] Preferably, the pressure medium is butter.

[0014] Preferably, a second piston chamber is provided in the tooling body, and the second piston chamber is arranged along the axial direction of the tooling body, a plunger hole is provided at the upper end of the second piston chamber, a plunger rod is connected to the plunger hole, a second piston body is provided at the lower end of the plunger rod, and the second piston body is located in the second piston chamber; the second piston chamber is connected to the annular pressure chamber through a connecting channel; the connecting channel is located above the second piston body; a spring is provided between the second piston body and the bottom of the second piston chamber; the upper end of the plunger rod is higher than the upper end surface of the tooling body, and the upper end of the plunger rod is connected to a pressing pin; when the workpiece is clamped, a pressing ring is placed above the workpiece, and the pressing pin applies a downward pressing force to the pressing ring.

[0015] Preferably, the plunger rod can rotate in the plunger hole; a second sealing ring is provided on the second piston body, and the second piston body is sealed with the second piston cavity through the second sealing ring; a third sealing ring is provided on the plunger rod, and the plunger rod is sealed with the plunger hole through the third sealing ring.

[0016] A method for using a liquid expansion sleeve tooling for gear shaping, the specific method is as follows:

[0017] Place the workpiece on the upper end of the lower positioning sleeve, and place a pressure ring on the upper end of the workpiece; rotate the pressure pin so that the pressure pin is located above the pressure ring; rotate the clamping screw in one direction, push the first piston body to move in the direction of the workpiece through the clamping screw, and apply pressure to the pressure medium through the first piston body; the pressure medium applies inward pressure to the thin-walled section on the thin-walled sleeve, and the thin-walled section deforms inward and holds the workpiece tightly; at the same time, the second piston body moves downward under the pressure of the pressure medium, and drives the plunger rod and the pressure pin to move downward, and the pressure pin applies a downward pressing force to the pressure ring;

[0018] After the workpiece is processed, the compression screw is rotated in the other direction to relieve the pressure of the pressure medium, the thin-walled section returns to its initial state and the workpiece is released, and at the same time the plunger rod and the compression pin move upward under the action of the spring.

[0019] The beneficial effects of the present invention are:

[0020] 1. In the present invention, when the pressure medium in the annular pressure chamber is pressurized, the pressure medium will exert inward pressure on the thin-walled section, and the thin-walled section will deform inward when subjected to the pressure of the pressure medium; the deformation of the thin-walled section enables it to hold the workpiece inside tightly, thereby eliminating the fitting gap between the workpiece and the thin-walled section, avoiding the horizontal movement of the workpiece, and thus ensuring the processing accuracy.

[0021] 2. The thin-walled section holds the workpiece tightly, which suppresses the up and down vibration of the workpiece during processing, effectively reduces the up and down amplitude of the workpiece, and further ensures the processing accuracy of the workpiece. The reduction of workpiece vibration reduces unnecessary impact force between the tool and the workpiece, which helps to slow down the wear rate of the tool (gear shaping cutter) and extend the service life of the tool (gear shaping cutter). BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural schematic diagram of one direction of the present invention.

[0023] Figure 2 It is a structural schematic diagram of another aspect of the present invention.

[0024] Figure 3 It is a top view of the present invention.

[0025] Figure 4 for Figure 3 Cross-sectional view along the AA direction.

[0026] Figure 5 for Figure 3 Cross-sectional view along the BB direction.

[0027] Figure 6 It is a schematic diagram of the structure of a thin-walled sleeve.

[0028] Figure 7 It is a structural schematic diagram of an existing rigid wheel workpiece.

[0029] In the figure: 1. workpiece, 1a. internal gear processing ring surface, 2. tooling body, 3. lower positioning sleeve, 4. pressure ring, 5. thin-walled sleeve, 5a. thin-walled section, 5b. connecting section, 6. threaded sleeve, 7. clamping screw, 8. locking nut, 9. plunger rod, 10. pressure pin, 11. connecting screw, 12. first piston chamber, 13. first piston body, 14. annular pressure chamber, 15. first sealing ring, 16. second piston body, 18. spring, 19. second piston chamber, 20. second sealing ring, 21. third sealing ring, 22. connecting channel. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of the present invention.

[0031] Those skilled in the art should understand that, in the disclosure of the present invention, the orientation or position relationship indicated by the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0032] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0033] like Figures 1 to 6 As shown, a liquid expansion sleeve tooling used for gear shaping processing includes a tooling body 2, an inner hole is provided on the tooling body 2, a lower positioning sleeve 3 and a thin-walled sleeve 4 are provided in the inner hole, a thin-walled sleeve 4 is provided with a thin-walled section 5a, an annular pressure chamber 14 is provided on the periphery of the thin-walled section 5a, and a pressure medium is provided in the annular pressure chamber 14; a pressurizing mechanism for pressurizing the pressure medium in the annular pressure chamber 14 is provided on the tooling body 2; when the workpiece 1 is clamped, the workpiece 1 is placed on the upper end of the lower positioning sleeve 3 and is located on the inner side of the thin-walled section 5a on the thin-walled sleeve 4; when the pressure medium in the annular pressure chamber 14 is pressurized, the thin-walled section 5a deforms inwardly and holds the workpiece 1 tightly.

[0034] When the present invention is used, the workpiece 1 is placed on the lower positioning sleeve 3, and the lower positioning sleeve 3 is used to position the lower end of the workpiece 1; the thin-walled section 5a on the thin-walled sleeve 4 is annular, and the inner diameter of the thin-walled section 5a is slightly larger than the outer diameter of the workpiece 1. The thin-walled section 5a is made of an elastic metal material (such as spring 18 steel), and the wall thickness of the thin-walled section 5a is small; when the pressure medium in the annular pressure chamber 14 is pressurized, the pressure medium will exert an inward pressure on the thin-walled section 5a, and the thin-walled section 5a will deform inward when subjected to the pressure of the pressure medium; the thin-walled section 5a is deformed to hold the workpiece 1 on the inside, thereby eliminating the matching gap between the workpiece 1 and the thin-walled section 5a, avoiding the movement of the workpiece 1 in the horizontal direction, ensuring the coaxiality between the workpiece 1 and the tooling, and thus ensuring the processing accuracy. In addition, the thin-walled section 5a holds the workpiece 1 tightly, suppressing the up and down vibration of the workpiece 1 during the processing, effectively reducing the up and down amplitude of the workpiece 1, and further ensuring the processing accuracy of the workpiece 1. Furthermore, the reduction in vibration of the workpiece 1 reduces unnecessary impact force between the tool and the workpiece 1, which helps to slow down the wear rate of the tool (gear shaping cutter) and extend the service life of the tool (gear shaping cutter).

[0035] The pressurizing mechanism includes a first piston chamber 12 arranged on the tooling body 2, one end of which is connected to the annular pressure chamber 14; a first piston body 13 is arranged in the first piston chamber 12, and a pushing mechanism for pushing the first piston body 13 to move is arranged at one end of the first piston body 13. Among them, the first piston chamber 12 is arranged along the radial direction of the tooling body 2, and the first piston body 13 is provided with a first sealing ring 15, through which the first piston body 13 and the first piston chamber 12 are sealed and matched; the space between the first piston body 13 and the annular pressure chamber 14 in the first piston chamber 12 is also filled with pressure medium; when the first piston body 13 moves in the direction close to the workpiece 1, the first piston body 13 squeezes the pressure medium, so that the pressure of the pressure medium increases, thereby increasing the pressure of the pressure medium on the outer side of the thin-walled section 5a, thereby causing the thin-walled end to deform inwardly; conversely, when the first piston body 13 moves in the direction away from the workpiece 1, the squeezing effect of the first piston body 13 on the pressure medium is reduced, so that the pressure of the pressure medium is reduced, thereby reducing the pressure of the pressure medium on the outer side of the thin-walled section 5a, and the thin-walled section 5a will return to its initial state.

[0036] The pushing mechanism includes a threaded sleeve 6 connected to the tool body 2, a clamping screw 7 is connected to the threaded sleeve 6, and the clamping screw 7 and the threaded sleeve 6 are threadedly matched; one end of the clamping screw 7 is in contact with the first piston body 13. The clamping screw 7 is rotated to move along the axial direction of the first piston chamber 12, thereby pushing the first piston body 13 to move in the first piston chamber 12. A locking nut 8 is connected to the clamping screw 7; after the rotation adjustment of the clamping screw 7 is completed, the locking nut 8 is tightened, and the clamping screw 7 is locked by the locking nut 8, so that the clamping screw 7 can stay stably in the current state.

[0037] The thin-walled sleeve 4 also includes connecting sections 5b arranged at both ends of the thin-walled section 5a, and the connecting sections 5b are interference fit with the inner hole on the tooling body 2. Among them, the wall thickness of the connecting section 5b is greater than the wall thickness of the thin-walled section 5a. The thin-walled sleeve 4 is installed in the inner hole of the tooling body by press-fitting. After the thin-walled sleeve 4 is pressed into the inner hole, the connecting sections 5b at both ends of the thin-walled section 5a are interference fit with the inner hole, so that the thin-walled sleeve 4 can be installed in the inner hole very firmly, and the thin-walled sleeve 4 is not easy to be separated from the tooling body 2; and, through the interference fit between the connecting section 5b and the inner hole wall, the connecting section 5b is in close contact with the inner hole wall, thereby realizing the sealing of the upper and lower sides of the annular pressure chamber 14, and preventing the pressure medium from leaking from between the connecting section 5b and the inner hole wall.

[0038] The lower positioning sleeve 3 is cylindrical and is fixedly connected to the tool body 2 via connecting screws 11 .

[0039] In this embodiment, the wall thickness of the thin-walled section 5a is 1.2-1.5 mm, and when the pressure medium is not pressurized, the fitting clearance between the thin-walled section 5a and the workpiece 1 is 0.03-0.04 mm.

[0040] In this embodiment, the pressure medium is butter. In addition, the pressure medium can also be hydraulic oil or gas liquid medium, which can be determined according to actual needs.

[0041] Furthermore, a second piston chamber 19 is provided in the tooling body 2, and the second piston chamber 19 is arranged along the axial direction of the tooling body 2. A plunger hole is provided at the upper end of the second piston chamber 19, and a plunger rod 9 is connected to the plunger hole. A second piston body 16 is provided at the lower end of the plunger rod 9, and the second piston body 16 is located in the second piston chamber 19; the second piston chamber 19 is connected to the annular pressure chamber 14 through a connecting channel 22; the connecting channel 22 is located above the second piston body 16; a spring 18 is provided between the second piston body 16 and the bottom of the second piston chamber 19; the upper end of the plunger rod 9 is higher than the upper end surface of the tooling body 2, and the upper end of the plunger rod 9 is connected to a pressing pin 10; when the workpiece 1 is clamped, a pressing ring 5 is placed above the workpiece 1, and the pressing pin 10 applies a downward pressing force to the pressing ring 5.

[0042] The area above the second piston body 16 in the second piston chamber 19 is filled with pressure medium, and the connecting channel 22 is also filled with pressure medium. When the workpiece 1 is clamped in the present invention, the pressure medium applies downward pressure to the second piston body 16 to move the second piston body 16 downward, and the second piston body 16 drives the plunger rod 9 and the pressing pin 10 to move downward, and the pressing pin 10 applies a downward pressing force to the pressing ring 5, so that the workpiece 1 is firmly pressed by the pressing ring 5. Through the pressing effect of the pressing pin 10 and the clamping effect of the thin-walled section 5a on the workpiece 1, the two are combined to firmly fix the workpiece 1 on the upper end of the lower positioning sleeve 3, effectively suppressing the up and down vibration of the workpiece 1 during the processing, thereby ensuring the processing accuracy of the workpiece 1.

[0043] In this embodiment, four second piston chambers 19 are evenly arranged on the tool body 2 , and the workpiece 1 is pressed downward simultaneously by the four second piston chambers 19 , so as to improve the pressing effect on the workpiece 1 .

[0044] Among them, the plunger rod 9 can rotate in the plunger hole; a second sealing ring 20 is provided on the second piston body 16, and the second piston body 16 is sealed with the second piston chamber 19 through the second sealing ring 20; a third sealing ring 21 is provided on the plunger rod 9, and the plunger rod 9 is sealed with the plunger hole through the third sealing ring 21.

[0045] A method for using a liquid expansion sleeve tooling for gear shaping, the specific method is as follows:

[0046] Place the workpiece 1 on the upper end of the lower positioning sleeve 3, and place the pressing ring 5 on the upper end of the workpiece 1; rotate the pressing pin 10 so that the pressing pin 10 is located above the pressing ring 5; rotate the clamping screw 7 in one direction, push the first piston body 13 to move in the direction of the workpiece 1 through the clamping screw 7, and apply pressure to the pressure medium through the first piston body 13; the pressure medium applies inward pressure to the thin-walled section 5a on the thin-walled sleeve 4, and the thin-walled section 5a deforms inward and holds the workpiece 1 tightly; at the same time, the second piston body 16 moves downward under the pressure of the pressure medium, and drives the plunger rod 9 and the pressing pin 10 to move downward, and the pressing pin 10 applies a downward pressing force to the pressing ring 5;

[0047] After the workpiece 1 is processed, the compression screw 7 is rotated in the other direction to release the pressure medium, the thin-walled section 5a returns to its initial state and releases the workpiece 1, while the plunger rod 9 and the pressure pin 10 move upward under the action of the spring 18; after the pressure pin 10 moves upward, the pressure ring 5 is released, and then the pressure pin 10 is turned away, so that the pressure ring 5 and the workpiece 1 can be removed from the tooling body 2.

[0048] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A liquid expansion tool for gear shaping, characterized in that: The tool body comprises an inner hole, a lower positioning sleeve and a thin-walled sleeve are arranged in the inner hole, a thin-walled sleeve is provided with a thin-walled section, an annular pressure chamber is arranged at the periphery of the thin-walled section, and a pressure medium is arranged in the annular pressure chamber; a pressurizing mechanism for pressurizing the pressure medium in the annular pressure chamber is arranged on the tool body; When clamping the workpiece, the workpiece is placed on the upper end of the lower positioning sleeve and is located on the inner side of the thin-walled section of the thin-walled sleeve; when the pressure medium in the annular pressure chamber is pressurized, the thin-walled section deforms inward and holds the workpiece tightly.

2. A liquid expansion tool for gear shaping according to claim 1, characterized in that: The pressurizing mechanism comprises a first piston chamber arranged on the tool body, one end of which is connected to the annular pressure chamber; a first piston body is arranged in the first piston chamber, and a pushing mechanism for pushing the first piston body to move is arranged at one end of the first piston body.

3. A liquid expansion tool for gear shaping according to claim 2, characterized in that: The pushing mechanism comprises a threaded sleeve connected to the tooling body, a clamping screw is connected in the threaded sleeve, and the clamping screw and the threaded sleeve are threadedly matched; one end of the clamping screw is in contact with the first piston body.

4. The liquid expansion tool for gear shaping according to claim 1, characterized in that: The thin-walled sleeve also includes connecting sections arranged at both ends of the thin-walled section, and the connecting sections are interference-fitted with the inner holes on the tooling body.

5. The liquid expansion tool for gear shaping according to claim 1, characterized in that: The lower positioning sleeve is connected to the tooling body via connecting screws.

6. The liquid expansion tool for gear shaping according to claim 1, characterized in that: The wall thickness of the thin-walled section is 1.2-1.5 mm, and when the pressure medium is not pressurized, the fitting clearance between the thin-walled section and the workpiece is 0.03-0.04 mm.

7. The liquid expansion tool for gear shaping according to claim 1, characterized in that: The pressure medium is butter.

8. The liquid expansion tool for gear shaping according to claim 3, characterized in that: A second piston chamber is provided in the tooling body, and the second piston chamber is arranged along the axial direction of the tooling body. A plunger hole is provided at the upper end of the second piston chamber, a plunger rod is connected to the plunger hole, a second piston body is provided at the lower end of the plunger rod, and the second piston body is located in the second piston chamber; the second piston chamber is connected to the annular pressure chamber through a connecting channel; the connecting channel is located above the second piston body; a spring is provided between the second piston body and the bottom of the second piston chamber; the upper end of the plunger rod is higher than the upper end surface of the tooling body, and a pressing pin is connected to the upper end of the plunger rod; when clamping the workpiece, a pressing ring is placed above the workpiece, and the pressing pin applies a downward pressing force to the pressing ring.

9. A liquid expansion tool for gear shaping according to claim 8, characterized in that: The plunger rod can rotate in the plunger hole; the second piston body is provided with a second sealing ring, and the second piston body is sealed with the second piston cavity through the second sealing ring; the plunger rod is provided with a third sealing ring, and the plunger rod is sealed with the plunger hole through the third sealing ring.

10. A method for using a liquid expansion tool for gear shaping, based on the liquid expansion tool for gear shaping according to claim 7, characterized in that: The specific method is as follows: Place the workpiece on the upper end of the lower positioning sleeve, and place a pressure ring on the upper end of the workpiece; rotate the pressure pin so that the pressure pin is located above the pressure ring; rotate the clamping screw in one direction, push the first piston body to move in the direction of the workpiece through the clamping screw, and apply pressure to the pressure medium through the first piston body; the pressure medium applies inward pressure to the thin-walled section on the thin-walled sleeve, and the thin-walled section deforms inward and holds the workpiece tightly; at the same time, the second piston body moves downward under the pressure of the pressure medium, and drives the plunger rod and the pressure pin to move downward, and the pressure pin applies a downward pressing force to the pressure ring; After the workpiece is processed, the compression screw is rotated in the other direction to relieve the pressure of the pressure medium, the thin-walled section returns to its initial state and the workpiece is released, and at the same time the plunger rod and the compression pin move upward under the action of the spring.

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