High-speed hobbing quick-change clamp

Abstract

The utility model provides a high-speed hobbing quick-change clamp which is mainly used for solving the technical problems that an existing hobbing clamp is poor in rigidity, and the time for replacing and adjusting the clamp is long. The utility model provides a high-speed hobbing quick-change clamp. The high-speed hobbing quick-change clamp comprises a tip assembly, a gland, a supporting piece, a clamp body and a base which are sequentially connected. One end of a center in the center assembly is mounted in a center shaft through a spring to realize floating positioning; meanwhile, the center shaft plays a role in guiding the center, and the positioning precision of the clamp is improved; the other end of the tip abuts against the pull rod assembly, auxiliary supporting force is provided, and the overall rigidity is improved. The device has the characteristics of simple structure, reasonable technology, convenience in operation, flexibility and convenience in use, wide application range, high interchangeability and the like.

Description

Technical Field

[0001] This utility model relates to gear clamps, specifically to a high-speed gear hobbing quick-change clamp. Background Technology

[0002] Gear hobbing fixtures are specialized process equipment used to fix and position the workpiece during gear hobbing. Faced with increasingly fierce market competition, gear processing technology is developing towards intelligence and high efficiency, and high-speed gear hobbing has become an important application. High-speed gear hobbing, by employing high-performance gear hobbing machine tools and optimized processing parameters, significantly increases the cutting speed, thereby significantly improving gear processing efficiency and quality.

[0003] The high speed in high-speed gear hobbing will result in a large cutting force, and the traditional gear hobbing fixture has poor rigidity and cannot match the large cutting force, which affects the accuracy of the workpiece teeth.

[0004] Chinese patent CN202020991730.3 discloses a high-precision gear hobbing fixture with adjustable pressure. It uses a compression spring and an adjusting cylinder elastically connected to the center shaft to adjust the clamping force between the pressure cap and the workpiece end face, achieving dynamic gear hobbing precision. However, its drawback is that when processing workpieces of different sizes, the time required for fixture replacement and adjustment is relatively long, leading to decreased production efficiency and failing to meet the demand for efficient production changeover. Utility Model Content

[0005] The purpose of this invention is to solve the technical problems of existing hobbing fixtures having poor rigidity, being unable to match large cutting forces, affecting the accuracy of workpiece teeth, or requiring long time to change and adjust fixtures when machining workpieces of different sizes. This invention proposes a high-speed hobbing quick-change fixture.

[0006] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0007] A high-speed gear hobbing quick-change fixture is characterized by comprising a base, fixture body, support, expansion sleeve, pull rod assembly, pressure cap, and center assembly.

[0008] The bottom of the base is used to secure an external machine tool;

[0009] The fixture body includes an integrally machined mandrel seat and a mandrel; the mandrel seat is connected above the base, and the mandrel is coaxially connected above the mandrel seat, with its upper end having a frustum-shaped structure, and the diameter of the mandrel is smaller than the diameter of the mandrel seat;

[0010] The support is sleeved on the outside of the mandrel and connected above the mandrel seat;

[0011] The expansion sleeve is fitted on the outside of the frustum-shaped structure at the upper end of the mandrel, and its inner conical surface is adapted to the outer conical surface of the frustum-shaped structure.

[0012] The pull rod assembly is inserted into the mandrel, mandrel seat and base. The upper end of the pull rod assembly extends out of the expansion sleeve and contacts the upper end face of the expansion sleeve, which is used to squeeze the expansion sleeve downward when force is applied. The lower end of the pull rod assembly protrudes from the base and is used to connect to the tension drive end of an external machine tool.

[0013] The center assembly includes a center, a center shaft, and a spring; the upper end of the center shaft is used to connect to the hydraulic cylinder drive end of an external machine tool; the pressure cap is coaxially connected below the center shaft and leaves space between it and the support for placing the workpiece to be processed.

[0014] The center shaft is provided with a spring groove, and the spring is placed in the spring groove. The center is inserted through the center shaft and the pressure cover. The upper end of the center is connected to the spring, and the lower end abuts against the upper end of the pull rod assembly.

[0015] Furthermore, the pull rod assembly includes an upper pull rod, a lower pull rod, a connecting sleeve, and a set screw;

[0016] The upper pull rod is sequentially inserted into the mandrel and the mandrel seat, the lower pull rod is inserted into the base, the connecting sleeve is set at the upper end of the lower pull rod and has an internal thread on its inner side, the lower end of the upper pull rod has an external thread, and the upper pull rod is threadedly connected to the connecting sleeve.

[0017] The upper end of the upper pull rod extends out of the expansion sleeve and is provided with a top cover; the top cover contacts the upper end face of the expansion sleeve; the lower end of the lower pull rod protrudes from the base and is used for threaded connection with the tension drive end of an external machine tool.

[0018] The set screw passes through the mandrel seat, and its inner end is located in the guide groove provided on the side of the upper pull rod to prevent the upper pull rod from rotating circumferentially.

[0019] Furthermore, the mandrel includes a cylindrical section at the lower end, a lower frustum-shaped section in the middle, and an upper frustum-shaped section at the top, the upper frustum-shaped section constituting the frustum-shaped structure; the diameter of the cylindrical section is smaller than the diameter of the mandrel seat;

[0020] The cylindrical section is connected above the mandrel seat; the large end of the lower frustum section is connected to the cylindrical section, and the small end is connected to the large end of the upper frustum section.

[0021] The support is fitted onto the outside of the cylindrical section.

[0022] Furthermore, the top cover is provided with a tip hole that matches the lower end of the tip, and the lower end of the tip abuts against the inside of the tip hole.

[0023] Furthermore, the spring groove is a circular groove, and the spring is a rectangular helical spring.

[0024] Furthermore, the expansion sleeve is a single-cone bonded expansion sleeve.

[0025] Furthermore, the pressure cap is connected to the bottom of the tip shaft by four first screws, the first screws being M6×16 socket head cap screws.

[0026] Furthermore, the support is connected to the top of the mandrel seat by four second bolts, which are M6×28 socket head cap screws.

[0027] Furthermore, the mandrel seat is connected to the top of the base by four third bolts, which are M6×28 socket head cap screws.

[0028] Furthermore, the base is connected to the worktable of an external machine tool by four fourth bolts, the fourth bolts being M10×28 socket head cap screws.

[0029] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0030] 1. This utility model provides a high-speed gear hobbing quick-change fixture, comprising a center assembly, a pressure cap, a support member, a fixture body, and a base connected in sequence. One end of the center in the center assembly is mounted in the center shaft via a spring, achieving floating positioning; simultaneously, the center shaft guides the center, improving the fixture's positioning accuracy; the other end of the center abuts against the pull rod assembly, providing auxiliary support and improving overall rigidity.

[0031] 2. The high-speed gear hobbing quick-change fixture provided by this utility model adopts a single-cone bonded expansion sleeve, which effectively increases the contact area between the expansion sleeve and the mandrel conical surface, with a contact rate of over 85%, thereby improving the rigidity of the fixture.

[0032] 3. The high-speed gear hobbing quick-change fixture provided by this utility model uses a set screw to abut against the side of the upper pull rod to prevent the upper pull rod from rotating, thereby improving the fixture's ability to match the larger cutting force of high-speed gear hobbing.

[0033] 4. The high-speed gear hobbing quick-change fixture provided by this utility model has a simple structure, reasonable technology, convenient operation, good fixing effect, flexible and convenient use, wide range of applications, high interchangeability, and can be used for quick-change structure assembly.

[0034] 5. This utility model provides a high-speed gear hobbing quick-change fixture with an expansion sleeve that is easy to disassemble and can be conveniently replaced with a suitable expansion sleeve according to the positioning diameter of the workpiece to be processed. The support and the mandrel seat are bolted together, and the pressure cap and the center shaft are screwed together, which facilitates disassembly and replacement, and allows for quick production changeover for workpieces with different thicknesses and outer diameters. Attached Figure Description

[0035] Figure 1 This is a structural schematic diagram of an embodiment of a high-speed gear hobbing quick-change fixture according to this utility model.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Center shaft; 2. Center; 3. First screw; 4. Pressure cap; 5. Top cap; 6. Expansion sleeve; 7. Support component; 8. Set screw; 9. Fixture body; 10. Base; 11. Spring; 12. Second bolt; 13. Third bolt; 14. Fourth bolt; 15. Pull rod; 16. Workpiece to be processed; 17. Connecting sleeve; 18. Upper pull rod. Detailed Implementation

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0039] This utility model relates to a high-speed gear hobbing quick-change fixture, such as... Figure 1 As shown, it includes a base 10, a clamp body 9, a support 7, a expansion sleeve 6, a pull rod assembly, a pressure cap 4, and a top assembly.

[0040] The base 10 is connected to the machine tool's worktable by four fourth bolts 14, which are M10×28 internal hexagonal head bolts.

[0041] The fixture body 9 includes a mandrel seat and a mandrel; the mandrel seat is connected to the base 10 by four third bolts 13, which are M6×28 socket head cap screws; the mandrel is coaxially connected above the mandrel seat, and includes a cylindrical section at the lower end, a lower frustum-shaped section in the middle, and an upper frustum-shaped section at the top; the upper frustum-shaped section forms a frustum-shaped structure; the diameter of the cylindrical section is smaller than the diameter of the mandrel seat. The cylindrical section is connected above the mandrel seat; the large end of the lower frustum-shaped section is connected to the cylindrical section, and the small end is connected to the large end of the upper frustum-shaped section; the support member 7 is sleeved on the outside of the cylindrical section and connected to the mandrel seat above by four second bolts 12, which are M6×28 socket head cap screws.

[0042] The expansion sleeve 6 is fitted onto the outer side of the frustoconical structure at the upper end of the mandrel. The inner conical surface of the expansion sleeve 6 is adapted to the outer conical surface of the frustoconical structure to ensure certain shape and position tolerances. In this embodiment, the expansion sleeve 6 adopts a single-cone bonded expansion sleeve, which has the advantages of low cost, less susceptibility to iron filings, high rigidity, and good interchangeability.

[0043] The pull rod assembly includes an upper pull rod 18, a lower pull rod 15, a connecting sleeve 17, and a set screw 8. The upper pull rod 18 passes sequentially through the mandrel and mandrel seat, while the lower pull rod 15 passes through the base 10. The connecting sleeve 17 is connected to the upper end of the lower pull rod 15, and its inner side is provided with internal threads. The upper end of the upper pull rod 18 extends out of the expansion sleeve 6, and its upper end is provided with a top cover 5, which mates with the upper end face of the expansion sleeve 6 to compress the expansion sleeve 6 downward under force. The lower end of the upper pull rod 18 is provided with external threads, and the upper pull rod 18 is threadedly connected to the connecting sleeve 17. The lower end of the lower pull rod 15 protrudes from the base 10 and is threadedly connected to the tension drive end of an external machine tool; the set screw 8 passes through the mandrel seat, and its inner end is located in a guide groove provided on the side of the upper pull rod 18 to prevent the upper pull rod 18 from rotating circumferentially. The axis of the set screw 8 is perpendicular to the axis of the upper pull rod 18. The set screw 8 is an M6×20 screw.

[0044] The center assembly includes a center 2, a center shaft 1, and a spring 11. The upper end of the center shaft 1 is used to connect to the hydraulic cylinder drive end of an external machine tool. A circular spring groove is provided inside the center shaft 1, and the spring 11, which is a rectangular helical spring, is placed in the spring groove. The center 2 passes through the center shaft 1 and the pressure cover 4, and the upper end of the center 2 is connected to the spring 11, which provides preload force to the center 2. The top cover 5 is provided with a center hole that matches the lower end of the center 2, and the lower end of the center 2 is installed inside the center hole.

[0045] The pressure cap 4 is connected to the bottom of the center shaft 1 by four first screws 3. The first screws 3 are M6×16 socket head cap screws. Space is left between the pressure cap 4 and the support 7 for placing the workpiece 16 to be processed.

[0046] In this invention, the support member 7 and the mandrel seat are detachably connected by the second bolt 12, and the pressure cap 4 and the center shaft 1 are detachably connected by the first screw 3. The expansion sleeve 6 is fitted onto the mandrel, and the expansion sleeve 6 of the corresponding size can be easily replaced for workpieces 16 of different sizes to be processed.

[0047] The base 10 is fixed to the worktable of the external machine tool by the fourth bolt 14. The center shaft 1 is connected to the hydraulic cylinder drive end of the external machine tool. The entire fixture only needs to be installed once and does not need to be installed again. Each time, only the parts to be hobbing need to be loaded and unloaded.

[0048] Work process:

[0049] Step 1: Place the workpiece 16 to be processed between the support 7 and the pressure cover 4, and sleeve it on the outside of the expansion sleeve 6; the support 7 can effectively prevent iron filings from entering the fixture, and also supports and positions the workpiece 16 to be processed.

[0050] Step 2: Manually operate the external machine tool. The machine tool drives the upper pull rod 18 downward through the lower pull rod 15. As the upper pull rod 18 moves downward, the top cover 5 drives the expansion sleeve 6 downward. Since the inner conical surface of the expansion sleeve 6 matches the outer conical surface of the mandrel, as the expansion sleeve 6 moves downward, the outer conical surface of the mandrel's frustum-shaped structure causes the expansion sleeve 6 to expand. At this time, the expansion sleeve 6 and the workpiece 16 to be processed are tightened, and the expansion sleeve 6 plays the role of positioning the workpiece 16 to be processed.

[0051] The hydraulic cylinder drive end of the external machine tool applies downward pressure to the center shaft 1. The center shaft 1 drives the pressure plate 4 to move downward and clamp the workpiece 16 to be processed. At the same time, the center 2 penetrates into the interior of the top cover 5, and the spring 11 connected to one end of the center 2 is compressed, providing compressive force to position and clamp the workpiece 16 to be processed. The entire process of clamping the parts is controlled by the external machine tool, and the operator only needs to operate the machine tool.

[0052] Step 3: The external machine tool begins processing the workpiece 16 to be processed;

[0053] Step 4: After processing, operate the corresponding button on the external machine tool to move the center spindle 1 upward under the action of the hydraulic cylinder of the external machine tool, which in turn moves the center 2 and the pressure plate 4 upward; at the same time, push the upper pull rod 18 upward through the lower pull rod 15, which moves the expansion sleeve 6 upward; since the inner conical surface of the expansion sleeve 6 matches the outer conical surface of the mandrel, the expansion sleeve 6 contracts as it moves upward, which plays the role of releasing the workpiece 16 to be processed; remove the processed workpiece to complete the processing.

Claims

1. A high-speed gear hobbing quick-change fixture, characterized in that: Includes a base (10), a clamp body (9), a support (7), a sleeve (6), a pull rod assembly, a pressure cap (4), and a top assembly; The bottom of the base (10) is used to fix an external machine tool; The fixture body (9) includes an integrally machined mandrel seat and a mandrel; the mandrel seat is connected above the base (10), and the mandrel is coaxially connected above the mandrel seat, with its upper end being a frustoconical structure, and the diameter of the mandrel is smaller than the diameter of the mandrel seat; The support member (7) is sleeved on the outside of the mandrel and connected above the mandrel seat; The expansion sleeve (6) is sleeved on the outside of the frustum-shaped structure at the upper end of the mandrel, and its inner conical surface is adapted to the outer conical surface of the frustum-shaped structure. The pull rod assembly is inserted into the spindle, spindle seat and base (10). The upper end of the pull rod assembly extends out of the expansion sleeve (6) and contacts the upper end face of the expansion sleeve (6) to squeeze the expansion sleeve (6) downward when subjected to force. The lower end of the pull rod assembly protrudes from the base (10) to connect with the stretching drive end of the external machine tool. The top assembly includes a top (2), a top shaft (1) and a spring (11); the upper end of the top shaft (1) is used to connect to the hydraulic cylinder drive end of an external machine tool; the pressure cover (4) is coaxially connected to the bottom of the top shaft (1) and has space between it and the support (7) for placing the workpiece (16) to be processed. A spring groove is provided inside the tip shaft (1), and the spring (11) is placed in the spring groove. The tip (2) passes through the tip shaft (1) and the pressure cap (4). The upper end of the tip (2) is connected to the spring (11), and the lower end abuts against the upper end of the pull rod assembly.

2. The high-speed gear hobbing quick-change fixture according to claim 1, characterized in that: The pull rod assembly includes an upper pull rod (18), a lower pull rod (15), a connecting sleeve (17), and a set screw (8); The upper pull rod (18) is sequentially inserted into the spindle and the spindle seat, the lower pull rod (15) is inserted into the base (10), the connecting sleeve (17) is set at the upper end of the lower pull rod (15) and has an internal thread on its inner side, the lower end of the upper pull rod (18) has an external thread, and the upper pull rod (18) is threadedly connected to the connecting sleeve (17). The upper end of the upper pull rod (18) extends out of the expansion sleeve (6) and is provided with a top cover (5); the top cover (5) is in contact with the upper end face of the expansion sleeve (6); the lower end of the lower pull rod (15) protrudes from the base (10) and is used to connect with the tension drive end of the external machine tool through a threaded connection. The set screw (8) passes through the mandrel seat, and its inner end is located in the guide groove provided on the side of the upper pull rod (18) to prevent the upper pull rod (18) from rotating circumferentially.

3. A high-speed gear hobbing quick-change fixture according to claim 2, characterized in that: The mandrel includes a cylindrical section at the lower end, a lower frustum section in the middle, and an upper frustum section at the top, with the upper frustum section forming the frustum-shaped structure; the diameter of the cylindrical section is smaller than the diameter of the mandrel seat; The cylindrical section is connected above the mandrel seat; the large end of the lower frustum section is connected to the cylindrical section, and the small end is connected to the large end of the upper frustum section. The support member (7) is sleeved on the outside of the cylindrical section.

4. A high-speed gear hobbing quick-change fixture according to claim 3, characterized in that: The top cover (5) is provided with a top hole that matches the lower end of the top point (2), and the lower end of the top point (2) abuts against the inside of the top hole.

5. A high-speed gear hobbing quick-change fixture according to claim 4, characterized in that: The spring groove is a circular groove, and the spring (11) is a rectangular helical spring.

6. A high-speed gear hobbing quick-change fixture according to claim 5, characterized in that: The expansion sleeve (6) is a single-cone bonded expansion sleeve.

7. A high-speed gear hobbing quick-change fixture according to claim 6, characterized in that: The pressure cap (4) is connected to the bottom of the tip shaft (1) by four first screws (3), the first screws (3) being M6×16 internal hexagonal head screws.

8. A high-speed gear hobbing quick-change fixture according to claim 7, characterized in that: The support member (7) is connected to the top of the mandrel seat by four second bolts (12), which are M6×28 internal hexagonal head bolts.

9. A high-speed gear hobbing quick-change fixture according to claim 8, characterized in that: The mandrel seat is connected to the base (10) above by four third bolts (13), the third bolts (13) being M6×28 internal hexagonal head bolts.

10. A high-speed gear hobbing quick-change fixture according to claim 9, characterized in that: The base (10) is connected to the workbench of an external machine tool by four fourth bolts (14), the fourth bolts (14) being M10×28 internal hexagonal head bolts.

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