A composite tooling for sun gear hobbing

Abstract

This utility model relates to the technical field of sun gear machining fixtures, specifically a sun gear hobbing composite fixture, including a base, a mandrel mounted at the center of the base, a clamping device mounted on the base, and a hydraulic nut located on the top of the mandrel. The clamping device includes a jaw mounted on the base, an adjusting rod rotatably connected to the jaw, and a pressure plate fixed on the base. The pressure plate has a raised long key. The jaw includes a jaw head section, a cylindrical section perpendicularly fixed to the jaw head section, and limiting keys symmetrically fixed on both sides of the cylindrical section. A threaded hole is opened in the center of the cylindrical section. The adjusting rod includes a threaded section, a middle section, and an end fixed in sequence. The middle section has an annular groove, and the end has a hexagonal shape. The threaded section of the adjusting rod is connected to the threaded hole in the cylindrical section. The long key is located in the annular groove of the middle section of the adjusting rod. This fixture can simplify the sun gear alignment steps, improve alignment efficiency, save process changeover time, and significantly improve production efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of sun gear machining fixtures, specifically a sun gear hobbing composite tooling. Background Technology

[0002] The sun gear is a key component in a planetary gear transmission system. Its hobbing and spline machining are important steps in the sun gear manufacturing process. Hobbing uses the relative motion between the hob and the gear being machined to simulate the meshing process of a pair of helical gears, gradually cutting the tooth profile on the gear blank. Splines are usually cut by a milling cutter at the corresponding part of the sun gear gear blank.

[0003] In gear hobbing and spline machining processes, the sun gear not only requires positioning and clamping to ensure machining stability, but also needs centering and alignment after clamping to ensure the machining accuracy of the teeth and splines. Therefore, the structure of the clamping fixture has higher requirements. For example, the existing technology "A Sun Gear Fixture" (publication number: CN116713544A) sets a mandrel at the center of the base plate of the fixture. The mandrel passes upward from the inner hole of the sun gear workpiece, and a nut and pressure plate are used at the upper end of the shaft to press the sun gear to achieve workpiece clamping and positioning. At the same time, a positioning rod is also provided on the base plate. The positioning rod can provide coarse positioning for the workpiece each time it is changed, thereby speeding up the workpiece alignment efficiency. However, the existing technology still has the following technical problems:

[0004] During the machining of the sun gear, due to the different parameters of its teeth and splines, the machining of the teeth and splines is usually performed as two separate processes. Therefore, after each process, the workpiece needs to be changed, and after each workpiece change, the sun gear needs to be aligned to ensure the machining accuracy of the teeth and splines. The existing tooling fixtures use a method of first using a positioning rod to roughly position the teeth of the sun gear, then using a dial indicator to check the radial runout of the outer circumference of the sun gear, and then using a copper rod to tap the outer circumference of the sun gear to gradually adjust the runout of the outer circumference of the sun gear to meet the requirements, thus achieving the purpose of alignment. This process is very cumbersome, and the tapping force of the copper rod is difficult to control. Too much or too little tapping force will increase the alignment time, resulting in an excessively long alignment process. At the same time, the positioning rod is close to the outer circumference of the sun gear teeth, which will interfere with the hobbing cutter cutting, making it impossible to perform the tooth machining and spline machining in the same process, thereby reducing the machining efficiency. Utility Model Content

[0005] This utility model provides a composite tooling for sun gear hobbing, which can solve the problems of cumbersome and time-consuming alignment process after sun gear clamping in the existing tooling, and the inability to simultaneously process the teeth and splines of the sun gear, resulting in low processing efficiency.

[0006] This application provides the following technical solution: a sun gear rolling milling composite tooling, including a base, a mandrel installed at the center of the base, a clamping device installed on the base, and a hydraulic nut located at the top of the mandrel, wherein the clamping device is evenly distributed around the mandrel in the circumferential direction;

[0007] The clamping device includes a pawl mounted on the base, an adjusting rod rotatably connected to the pawl, and a pressure plate fixed on the base. The pressure plate is provided with a protruding long key.

[0008] The chuck includes a chuck head section, a cylindrical section fixed perpendicularly to the chuck head section, and limiting keys symmetrically fixed on both sides of the cylindrical section. A threaded hole is provided in the center of the cylindrical section.

[0009] The adjusting rod includes a threaded section, a middle section, and an end head fixed in sequence. The middle section has an annular groove, and the end head is hexagonal in shape. The threaded section of the adjusting rod is connected to the threaded hole of the cylindrical section. The long key is located in the annular groove of the middle section of the adjusting rod.

[0010] Beneficial effects:

[0011] 1. Simplified alignment process and improved alignment efficiency. Existing fixtures involve complex alignment steps after part changes between processes, requiring coarse positioning, runout detection, and tapping adjustments. This fixture, however, utilizes a circumferentially distributed clamping device. A wrench is used to turn the hexagonal end of the adjusting rod, causing it to rotate circumferentially. A long key on the pressure plate provides axial restraint for the adjusting rod. Simultaneously, the cylindrical section is threadedly connected to the adjusting rod. Therefore, rotating the adjusting rod drives the entire jaw to move radially, causing the jaw head to radially push the sun gear from its inner hole to adjust its position. Because the cylindrical section of the adjusting rod and the jaw are threadedly connected, the jaw pushes the sun gear relatively smoothly during the tightening process, resulting in a relatively smooth change in the dial indicator reading. Compared to existing technologies, this solution can quickly and accurately adjust the runout, achieving rapid and precise alignment of the sun gear.

[0012] 2. Saves changeover time and improves processing efficiency. This fixture uses a mandrel and hydraulic nut to clamp and position the sun gear. Therefore, after the sun gear is clamped, there are no interfering parts on its outer circumference, which facilitates the cutting of the teeth and splines by the tool. It can be used to process the sun gear teeth and splines in the same operation, thereby reducing the workpiece changeover process and avoiding repeated loading and unloading of workpieces, thus reducing the overall workpiece processing time. In addition, in actual production, one worker usually operates multiple machines. While one machine is preparing, other machines may be in an inactive state. Therefore, reducing changeover time helps to reduce the standby time of the equipment, thereby improving equipment utilization and processing efficiency.

[0013] Furthermore, the base is provided with mounting grooves for installing the clamping device. The mounting grooves are evenly distributed along the circumference of the base. The mounting grooves include radially opened arc-shaped grooves, keyways symmetrically opened on both sides of the arc-shaped grooves, and plate grooves opened above the keyways. The middle section of the adjusting rod is rotatably connected in the arc-shaped groove. The limiting key of the pawl is located in the keyway. The cylindrical section of the pawl is slidably connected in the arc-shaped groove. The pressure plate is fixed in the plate groove.

[0014] Beneficial effects: The middle section of the adjusting rod can rotate freely within the arc-shaped groove. The operator can easily rotate the end of the adjusting rod by turning the hexagonal design of the end, which facilitates the turning operation and allows the chuck to slide within the arc-shaped groove. This enables quick clamping and adjustment of sun gears with different inner hole sizes, greatly improving the versatility and flexibility of the tooling. At the same time, the independent design of the mounting slots facilitates adjustment of the sun gear from all directions, improving the convenience of adjustment. In addition, the design of each independent mounting slot also allows for easy disassembly of the adjusting rod, chuck, and pressure plate from their respective slots for inspection, maintenance, or replacement of parts.

[0015] Furthermore, the base has a through inner hole in the middle, which includes a bottom hole, a middle hole and a top hole connected in sequence, and the diameter of the middle hole is smaller than that of the bottom hole and the top hole.

[0016] Beneficial effects: The bottom hole reduces the weight of the base and facilitates its movement; the middle hole can precisely fit shaft parts of specific specifications, playing a limiting and guiding role to ensure installation accuracy; the top hole facilitates the fixing with connecting parts, meeting the installation needs of different tooling components and enhancing the versatility of tooling.

[0017] Furthermore, the mandrel includes a long shaft section, a disc section, and a short shaft section fixed from top to bottom, with the short shaft section located inside the central hole and the disc section located inside the top hole.

[0018] Beneficial effects: The long shaft section can penetrate deep into the inner hole of the sun gear blank, and the top of the long shaft is used to receive the hydraulic nut, which facilitates the clamping and fixing of the sun gear; the disc section increases the contact area with the top hole, and the disc section can be locked and fixed to the bottom surface of the top hole with screws, which improves the stability of the mandrel and the base installation; the short shaft section is in the middle hole, which plays a precise limiting and guiding role, ensuring that the mandrel installation position is accurate.

[0019] Furthermore, the base includes a base plate and a seat fixed on the base plate, and the base plate is evenly distributed with U-shaped grooves around its perimeter.

[0020] Beneficial effects: The base plate provides a stable foundation for the entire tooling, ensuring that the tooling will not easily shift due to vibration or external forces during processing. The base body is fixed on the base plate, which can support and securely install mandrels and clamping devices, ensuring the stability of the coordinated operation of all parts of the tooling. The U-shaped grooves evenly distributed around the base plate can be used to conveniently fix the base to the worktable of different processing equipment using bolts and other connectors, adapting to the installation needs of various equipment and improving the versatility of the tooling.

[0021] Furthermore, the upper surface of the base is provided with a lifting hole.

[0022] Beneficial effects: Lifting holes play a key role in the handling and installation of tooling. With the help of cranes and other lifting equipment, the base can be safely, stably and efficiently lifted to the designated location by the cooperation of the hook and the lifting hole. This greatly saves manpower and improves handling efficiency. It is especially suitable for large and heavy tooling bases, reducing the safety risks and time losses that may be caused by manual handling. Attached Figure Description

[0023] Figure 1 This is an isometric view of the present invention.

[0024] Figure 2 for Figure 1 A magnified view of the base.

[0025] Figure 3 for Figure 2 Half-section view of the central base.

[0026] Figure 4 for Figure 1 Isometric view of the central mandrel.

[0027] Figure 5 for Figure 1 Isometric view after removing the pressure plate.

[0028] Figure 6 for Figure 5 A magnified view of the chuck claw.

[0029] Figure 7 for Figure 5 A magnified view of the adjustment lever.

[0030] Figure 8 for Figure 1 Front view of the bottom surface of the intermediate pressure plate.

[0031] Figure 9 This is an isometric view of the tool after the sun gear has been clamped. Detailed Implementation

[0032] The following detailed description illustrates the specific implementation methods:

[0033] The markings in the accompanying drawings of the instruction manual include: base plate 1, seat 2, pressure plate 3, long key 301, chuck 4, spindle 5, long shaft section 501, disc section 502, short shaft section 503, arc groove 6, keyway 7, screw hole 8, plate groove 9, lifting hole 10, top hole 11, middle hole 12, bottom hole 13, adjusting rod 14, threaded section 141, intermediate section 142, annular groove 143, end 144, sun wheel 15, washer 16, hydraulic nut 17, and upper center 18.

[0034] Example 1

[0035] like Figures 1 to 9 As shown, a milling compound tooling for a sun gear 15 includes a base, a mandrel 5 mounted at the center of the base, a clamping device mounted on the base, and a hydraulic nut 17 located on top of the mandrel 5. The clamping devices are evenly distributed around the mandrel 5.

[0036] like Figure 1 and Figure 2 As shown, the base includes an integrally formed base plate 1 and a seat body 2 fixed on the base plate 1. U-shaped grooves are evenly distributed around the base plate 1, and a lifting hole 10 is provided on the upper surface of the base.

[0037] like Figure 1 , Figure 2 and Figure 3 As shown, the base is also provided with mounting grooves for installing the clamping device. The mounting grooves are evenly distributed along the circumference of the base. Each mounting groove includes a radially opening arc-shaped groove 6, keyways 7 symmetrically opened on both sides of the arc-shaped groove 6, and a plate groove 9 opened above the keyways 7. The plate groove 9 is provided with screw holes 8. Figure 3 As shown, the base has a through inner hole in the middle, which includes a bottom hole 13, a middle hole 12 and a top hole 11 connected in sequence. The diameter of the middle hole 12 is smaller than that of the bottom hole 13 and the top hole 11.

[0038] like Figure 4 As shown, the mandrel 5 includes a long shaft section 501, a disc section 502, and a short shaft section 503 integrally formed from top to bottom. The short shaft section 503 is mounted on... Figure 3 The disc segment 502 is fixed to the center hole 12 by screws. Figure 3 Inside the top hole 11.

[0039] like Figure 1 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, the clamping device includes a pawl 4 mounted on the base, an adjusting rod 14 rotatably connected to the pawl 4, and a pressure plate 3 fixed on the base.

[0040] like Figure 6As shown, the chuck 4 includes a chuck head section, a cylindrical section fixed perpendicularly to the chuck head section, and limiting keys symmetrically fixed on both sides of the cylindrical section. A threaded hole is provided at the center of the cylindrical section. Figure 2 , Figure 5 and Figure 6 As shown, the limiting key of the chuck 4 is located within the keyway 7, and the limiting key is slidably connected to the keyway 7. The cylindrical section of the chuck 4 is slidably connected within the arc-shaped groove 6, and the chuck head section of the chuck 4 remains vertically upward. Figure 7 As shown, the adjusting rod 14 includes an integrally formed threaded section 141, a middle section 142, and an end 144. The middle section 142 has an annular groove 143, and the end 144 is hexagonal in shape. The middle section 142 of the adjusting rod 14 is rotatably connected to... Figure 2 The arc-shaped groove 6 is inside; the threaded section 141 of the adjusting rod 14 is threadedly connected to... Figure 6 Inside the threaded hole in the middle cylindrical section; such as Figure 1 , Figure 2 and Figure 8 As shown, pressure plate 3 passes through Figure 2 The screw hole 8 is fixed on the plate groove 9. The pressure plate 3 is provided with a protruding long key 301. After the pressure plate 3 is fixed on the plate groove 9, the long key 301 is located in the annular groove 143 of the middle section 142 of the adjusting rod 14.

[0041] like Figure 9 As shown, Figure 9 After the sun gear 15 is clamped, the base plate 1 can be fixed to the workbench of the equipment by means of U-shaped groove and bolts. The sun gear 15 is placed on the base 2. A washer 16 and a hydraulic nut 17 are provided at the upper end of the spindle 5 to press the upper end face of the sun gear 15.

[0042] The usage method of this tooling is as follows:

[0043] First, connect the base to the equipment workbench, align the base, and then lock it in place. Next, hoist the sun gear 15 onto the end face of the base 2, ensuring that the claw head section of the chuck 4 and the long shaft section 501 of the spindle 5 are both located within the inner hole of the sun gear 15. Install a dial indicator on the outer circumference of the teeth and the outer circumference of the spline section of the sun gear 15. Then, use a wrench to turn the hexagonal end 144 of the adjusting rod 14 to rotate the adjusting rod 14 circumferentially. The long key 301 on the pressure plate 3 is located within the annular groove 143 of the middle section 142 of the adjusting rod 14. Therefore, when the adjusting rod 14 rotates, it will only rotate axially and cannot move axially. Simultaneously, the cylindrical section of the chuck 4 is threadedly connected to the threaded section 141 of the adjusting rod 14. Therefore, when rotating the adjusting rod 14... The entire chuck 4 is driven to move radially relative to the inner hole of the base 2, so that the chuck head section radially pushes the sun wheel 15 from the inner hole of the sun wheel 15 to adjust its position. According to the dial indicator reading, the adjusting rods 14 in various directions around the base are adjusted accordingly to finally control the runout of the spline part and the runout of the tooth part to be within the qualified range. Then, washers 16 and hydraulic nuts 17 are placed on the top of the sun wheel 15 to press and fix the sun wheel 15. Finally, the upper center 18 of the equipment is started to move downward to push against the top of the long shaft. The long shaft has a center hole to facilitate the fit with the conical surface of the upper center 18. Then the equipment is started to begin processing.

[0044] The above are merely embodiments of this utility model, and the utility model is not limited to the field covered by this embodiment. Commonly known structures and characteristics in the solutions are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of this utility model, and these should also be considered within the scope of protection of this utility model. These modifications will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A composite tooling for milling sun gears, characterized in that: It includes a base, a mandrel mounted at the center of the base, a clamping device mounted on the base, and a hydraulic nut located on the top of the mandrel, wherein the clamping device is evenly distributed around the mandrel in a circumferential direction; The clamping device includes a chuck mounted on a base, an adjusting rod rotatably connected to the chuck, and a pressure plate fixed on the base. The pressure plate has a raised long key. The chuck includes a chuck head section, a cylindrical section fixed perpendicularly to the chuck head section, and limiting keys symmetrically fixed on both sides of the cylindrical section. A threaded hole is opened in the center of the cylindrical section. The adjusting rod includes a threaded section, a middle section, and an end fixed in sequence. An annular groove is opened in the middle section, and the end is hexagonal in shape. The threaded section of the adjusting rod is connected to the threaded hole in the cylindrical section. The long key is located in the annular groove of the middle section of the adjusting rod.

2. The sun gear hobbing composite tooling according to claim 1, characterized in that: The base is provided with mounting grooves for installing the clamping device. The mounting grooves are evenly distributed along the circumference of the base. The mounting grooves include radially opened arc-shaped grooves, keyways symmetrically opened on both sides of the arc-shaped grooves, and plate grooves opened above the keyways. The middle section of the adjusting rod is rotatably connected in the arc-shaped groove. The limiting key of the pawl is located in the keyway. The cylindrical section of the pawl is slidably connected in the arc-shaped groove. The pressure plate is fixed in the plate groove.

3. The sun gear hobbing composite tooling according to claim 2, characterized in that: The base has a through-hole in the middle, which includes a bottom hole, a middle hole and a top hole connected in sequence. The diameter of the middle hole is smaller than that of the bottom hole and the top hole.

4. The sun gear hobbing composite tooling according to claim 3, characterized in that: The mandrel includes a long shaft section, a disc section, and a short shaft section fixed from top to bottom. The short shaft section is located inside the middle hole, and the disc section is located inside the top hole.

5. The sun gear hobbing composite tooling according to claim 4, characterized in that: The base includes a base plate and a seat fixed on the base plate, and the base plate is evenly distributed with U-shaped grooves around its perimeter.

6. The sun gear hobbing composite tooling according to claim 5, characterized in that: The upper surface of the base is provided with a hoisting hole.

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