Micro-gear hobbing machine

Abstract

The invention relates to the technical field of gear hobbing machines, and provides a micro-gear hobbing machine which comprises a machine body, a workbench, a stand column and a hob, the workbench is movably arranged on the machine body, the stand column is fixedly connected to the workbench, the micro-gear hobbing machine further comprises a clamping base, a positioning block, a tool rest, a heat preservation cover, a spraying pipe and a camera, the clamping base is rotatably arranged on the workbench, and the hob is fixedly connected to the positioning block. The positioning block is arranged on the stand column in a liftable mode, the positioning block and the clamping base are coaxially arranged, the tool rest is arranged on the lathe bed in a liftable and rotatable mode, a driving shaft is arranged on the tool rest in a rotatable mode, the hob is connected with the driving shaft through a limiting assembly, the heat preservation cover is fixedly connected to the tool rest, a gear workpiece is located in the heat preservation cover, and the spraying pipe is installed at the top of the heat preservation cover. The camera is installed on the side wall of the heat preservation cover and used for shooting images of the gear workpiece. By means of the technical scheme, the technical problem that in the prior art, when a gear hobbing machine is used for machining a micro gear, the machining precision requirement of the micro gear is difficult to meet is solved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of gear hobbing machine technology, specifically to a micro gear hobbing machine. Background Technology

[0002] The gear hobbing machine is the most widely used gear machining machine tool. The hob is mounted on the hob spindle and driven by the main motor to rotate. The tool post can move vertically along the column guide rail and can also be adjusted at an angle around the horizontal axis. The workpiece is mounted on the worktable and is driven to rotate by the indexing worm gear pair. Together with the movement of the hob, it constitutes the generating motion. The worktable can move along the bed guide rail to accommodate different workpiece diameters and to perform radial feed.

[0003] When machining smaller gears, problems such as insufficient tooth root strength and tooth profile error are more likely to occur due to the small module and number of teeth of the pinion, requiring a higher level of machining accuracy. In addition, when clamping micro gears, small workpieces are prone to deformation, which will also affect the machining accuracy of the gears. Summary of the Invention

[0004] To overcome the above-mentioned defects, the present invention provides a micro gear hobbing machine to solve the technical problem that existing hobbing machines have difficulty meeting the machining accuracy requirements of micro gears.

[0005] According to one aspect, at least one embodiment of the present invention provides a micro gear hobbing machine, including a bed, a worktable, a column, and a hob. The worktable is movably disposed on the bed, and the column is fixedly connected to the worktable. The machine also includes a clamping seat, a positioning block, a tool holder, a heat insulation cover, a spray pipe, and a camera. The clamping seat is rotatably disposed on the worktable for mounting gear workpieces. The positioning block is liftably disposed on the column and is coaxially disposed with the clamping seat. The positioning block is inverted conical in shape. The tool holder is liftably and rotatably disposed on the bed, and a drive shaft is rotatably disposed on the tool holder. The hob is connected to the drive shaft via a limiting assembly. The limiting assembly includes a connecting shaft, a limiting shaft, and a limiting plate. The connecting shaft and the drive shaft are coaxially and fixedly connected. The tool holder has a setting for the limiting... The shaft has a mounting hole through which it passes. The limiting shaft and the connecting shaft are coaxially arranged. The limiting shaft is fixedly connected to an insert plate. The connecting shaft has a slot that matches the insert plate. The hob has a through hole that matches the limiting shaft. The limiting shaft is a hollow structure. The limiting shaft is connected to a cold water pipe for supplying cold water to its interior. There are two limiting plates. The two limiting plates are coaxially fixedly fitted onto the outside of the connecting shaft and the limiting shaft, respectively. The heat insulation cover is fixedly connected to the tool holder. The gear workpiece is located inside the heat insulation cover. The heat insulation cover is a detachable structure. The heat insulation cover has a machining port for the hob to enter. The spray pipe is installed on the top of the heat insulation cover for spraying cutting fluid onto the gear hobbing position. The camera is installed on the side wall of the heat insulation cover for capturing images of the gear workpiece.

[0006] To reduce interference with the images captured by the camera, the heat insulation cover has an installation port, and a transparent mounting shell is fixedly connected inside the installation port. The camera is installed inside the transparent mounting shell. The heat insulation cover is provided with a blowing component for blowing the transparent mounting shell. The blowing component includes a blowing pipe, which is installed on the top of the heat insulation cover and is connected to a blowing nozzle for blowing gas onto the transparent mounting shell and the gear workpiece.

[0007] To further improve the rotational accuracy of the hob, a plurality of limiting rods are fixedly connected to the side of the limiting plate near the hob. The hob is provided with a plurality of limiting holes that match the limiting rods. The ends of the limiting rods are chamfered to facilitate the insertion of the limiting rods into the limiting holes.

[0008] Preferably, the heat insulation cover includes a bottom cover and a top cover. The bottom cover is connected to the workbench and the tool holder. Multiple support plates are fixedly connected to the outside of the bottom cover. Multiple connecting plates are fixedly connected to the outside of the top cover. A plug rod is fixedly connected to the bottom of the connecting plate. The support plate has a plug hole that matches the plug rod. A magnet is fixedly connected to the top of the support plate. The connecting plate is made of iron metal.

[0009] To further ensure the clamping accuracy of the gear workpiece, a fixing plate is fixedly connected to the outside of the positioning block. The fixing plate is connected to a clamping ring through a clamping spring and a telescopic rod. The clamping ring abuts against the upper surface of the gear workpiece.

[0010] To further ensure the accuracy of gear workpiece clamping, the interior of the heat insulation cover is equipped with an anti-offset component for limiting and sensing the side of the gear workpiece. The anti-offset component includes clamping rings, and multiple clamping rings are provided. The multiple clamping rings move synchronously and contact the outer wall of the gear workpiece. Displacement sensors are installed on the clamping rings.

[0011] The beneficial effects of the embodiments of the present invention are as follows: 1. In this invention, the gear workpiece is placed on the clamping seat, and the positioning block descends. The inverted conical shape of the positioning block positions the center hole of the gear workpiece. At the same time, the positioning block drives the clamping spring to press the clamping ring against the upper surface of the gear workpiece, ensuring that the gear workpiece is horizontal and coaxial with the clamping seat, so that the clamping seat drives the gear workpiece to rotate stably.

[0012] 2. In this invention, the connecting shaft is driven to rotate by the drive shaft, and the limiting shaft is driven to rotate synchronously by the insert plate. The hob is limited by the limiting shaft, the limiting plate and the limiting rod to ensure the coaxiality of the hob and the drive shaft, so that the hob rotates stably and performs hobbing on the gear workpiece.

[0013] 3. In this invention, cutting fluid is sprayed onto the hobbing position through a spray pipe to cool the hob and gear workpiece. At the same time, the temperature of the machining position is maintained within a certain range by a heat insulation cover to a certain extent, reducing the thermal deformation of the gear workpiece and the hob. Meanwhile, cold water is introduced into the interior of the limiting shaft to further reduce the thermal deformation of the hob, thereby ensuring the machining accuracy.

[0014] 4. In this invention, the camera captures images of the gear workpiece after hobbing and transmits them to the processor. The processor identifies and judges the images, and judges the pitch error and tooth profile deviation of the gear workpiece, that is, it monitors the machining accuracy. At the same time, the transparent mounting shell and the surface of the gear workpiece are blown by the blowing nozzle to reduce the interference of cutting fluid and burrs on the captured images.

[0015] 5. In this invention, when the gear workpiece is clamped, the clamping ring moves synchronously to limit the position of the gear workpiece, making the gear workpiece and the clamping seat coaxial. During the gear hobbing process, there is a small gap between the clamping ring and the gear workpiece. When the gear workpiece deviates from the center position, it will collide with the clamping ring during the rotation of the gear workpiece. The displacement sensor senses the movement of the clamping ring and will also detect the offset of the gear workpiece in time, and adjust the position of the gear workpiece to ensure the machining accuracy.

[0016] 6. Therefore, compared with the existing gear hobbing machines, this invention limits the hob by using a limiting shaft, limiting plate, and limiting rod; limits the gear workpiece by using a positioning block and clamping ring, ensuring stable rotation of the hob and gear workpiece; cools the hob by introducing cold water into the limiting shaft; cools the machining area by spraying cutting fluid onto the hob and gear workpiece through a spray pipe; and maintains a relatively stable temperature environment for the gear workpiece machining through a heat insulation cover, reducing thermal deformation of the hob and gear workpiece. Simultaneously, a camera monitors the machining accuracy of the gear workpiece, and a clamping ring monitors the offset of the gear workpiece, ensuring the machining accuracy of the gear workpiece. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0018] Figure 1 This is a first-view structural schematic diagram of an embodiment of the present invention; Figure 2 for Figure 1 A schematic diagram of the overall structure from a second perspective in the embodiment; Figure 3 for Figure 1 A schematic diagram of the structure of the clamping seat, positioning block, heat insulation cover and anti-displacement component in the embodiment; Figure 4 for Figure 1 A schematic diagram of the positioning block, clamping ring, camera, and heat insulation cover in the embodiment; Figure 5 for Figure 1 The embodiment is shown in the structural schematic diagram of the hob, drive shaft, cooling water pipe and limiting assembly; Figure 6 for Figure 1 A schematic diagram of the structure of the heat insulation cover in the embodiment; Figure 7 for Figure 1A schematic diagram of the anti-offset component in the embodiment; Figure 8 for Figure 7 A magnified schematic diagram of the structure at point A in the middle.

[0019] In the picture: 1. Bed; 2. Worktable; 3. Column; 4. Hob; 5. Clamping seat; 6. Positioning block; 7. Electric cylinder; 8. Fixing plate; 9. Clamping ring; 10. Tool post; 11. Drive shaft; 12. Cold water pipe; 13. Water inlet seat; 14. Spray pipe; 15. Camera; 16. Transparent mounting shell; 101. Connecting shaft; 102. Limiting shaft; 103. Limiting plate; 104. Mounting base; 105. Insert plate; 106. Limiting rod; 201. Base cover; 202. Top cover; 203. Support frame; 204. Support plate; 205. Connecting plate; 206. Insert rod; 207. Magnet; 301. Purge pipe; 302. Purge nozzle; 401. Clamping ring; 402. Adjusting screw; 403. Driven bevel gear; 404. Rotating shaft; 405. Driven bevel gear; 406. Displacement sensor; 407. Adjusting motor. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0021] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0022] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0024] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0025] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] like Figures 1 to 8 The diagram illustrates a micro gear hobbing machine according to an embodiment of the present invention, comprising a bed 1, a worktable 2, a column 3, and a hob 4. The worktable 2 is movably mounted on the bed 1, and the column 3 is fixedly connected to the worktable 2. The machine also includes a clamping seat 5, a positioning block 6, a tool holder 10, a heat insulation cover, a spray pipe 14, and a camera 15. A lead screw feed mechanism is installed on the bed 1 to drive the worktable 2 to move. A guide rail is provided at the bottom of the bed 1 to limit the movement of the column 3 and ensure its stability. Compared with existing gear hobbing machines, the present invention utilizes a limiting shaft 102, a limiting plate 103, and a limiting rod. The hob 4 is limited by the positioning block 6 and the clamping ring 9 to ensure stable rotation of the hob 4 and the gear workpiece. Cold water is introduced into the limiting shaft 102 to cool the hob 4. Cutting fluid is sprayed onto the hob 4 and the gear workpiece through the spray pipe 14 to cool the machining position. The heat insulation cover keeps the machining of the gear workpiece in a relatively stable temperature environment, reducing the thermal deformation of the hob 4 and the gear workpiece. At the same time, the machining accuracy of the gear workpiece is monitored by the camera 15 and the offset of the gear workpiece is monitored by the clamping ring 401 to ensure the machining accuracy of the gear workpiece.

[0027] When the gear hobbing machine is working, the hob 4 is mounted on the drive shaft 11 and is driven by the main motor to rotate. The tool holder 10 can move along the guide rail of the bed 1 and can also be adjusted at an angle around the horizontal axis. The gear workpiece is mounted on the clamping seat 5 of the worktable 2 and is driven to rotate by the indexing worm gear pair. Together with the movement of the hob 4, it constitutes the generating motion. The worktable 2 can move along the guide rail of the bed 1 to adapt to different gear workpiece diameters and to make radial feed. This is the working principle of the existing gear hobbing machine and is not the innovation of this invention. This invention is an improvement on the existing gear hobbing machine. The original structure will not be described in detail and will not affect the understanding of this invention.

[0028] like Figures 1 to 4 As shown, the clamping seat 5 is rotatably mounted on the worktable 2 for mounting gear workpieces. The positioning block 6 is vertically mounted on the column 3, and an electric cylinder 7 is mounted on the column 3. The positioning block 6 is rotatably connected to the output end of the electric cylinder 7. The positioning block 6 and the clamping seat 5 are coaxially arranged. The positioning block 6 is inverted conical in shape. A fixing plate 8 is fixedly connected to the outside of the positioning block 6. The fixing plate 8 is connected to a clamping ring 9 through a clamping spring and a telescopic rod. The clamping ring 9 abuts against the upper surface of the gear workpiece. The gear workpiece is placed at the top of the clamping seat 5, and the electric cylinder 7 drives the positioning block 6 to descend and mount the gear. The gear workpiece is pressed against the top of the clamping seat 5. Under the action of the inverted conical positioning block 6, the gear workpiece with holes is restricted to the center position of the clamping seat 5. The inverted conical positioning block 6 is adapted to limit the gear workpiece with different hole diameters. During the descent of the positioning block 6, the fixing plate 8 and the clamping ring 9 are driven to descend. Under the action of the clamping spring, the clamping ring 9 presses the gear workpiece against the top of the clamping seat 5 to ensure the horizontal state of the gear workpiece, thereby ensuring the hobbing accuracy of the gear workpiece. The clamping seat 5 can drive the gear workpiece, the positioning block 6 and the clamping ring 9 to rotate synchronously.

[0029] The tool post 10 is height-adjustable and rotatable on the bed 1. A drive shaft 11 is rotatably mounted on the tool post 10. The main motor drives the drive shaft 11 to rotate. The hobbing cutter 4 is connected to the drive shaft 11 via a limiting assembly. The limiting assembly includes a connecting shaft 101, a limiting shaft 102, and a limiting plate 103. The connecting shaft 101 and the drive shaft 11 are coaxially and fixedly connected. The tool post 10 has a mounting hole for the limiting shaft 102 to pass through. A mounting base 104 is rotatably connected to the outside of the limiting shaft 102. The mounting base 104 is detachably connected to the tool post 10 via bolts. The limiting shaft 102 and the connecting shaft 101 are coaxially arranged. An insert plate 105 is fixedly connected to the limiting shaft 102. The shaft 101 has a slot that matches the insert plate 105, and the hob 4 has a through hole that matches the limiting shaft 102. The limiting shaft 102 is a hollow structure and is connected to a cold water pipe 12 for supplying cold water to its interior. The end of the limiting shaft 102 away from the connecting shaft 101 is rotatably connected to a water inlet seat 13. The water inlet seat 13 is connected to the cold water pipe 12 and a water outlet pipe. The cold water pipe 12 and the water outlet pipe can be connected to a refrigeration device or a faucet. Cold water is supplied to the interior of the limiting shaft 102 through the refrigeration device or faucet, and the cold water flows through the water outlet pipe, thus regulating the flow of cold water within the limiting shaft 102. Cooling is achieved to reduce the temperature rise and deformation of the hob 4 during long-term gear hobbing, thus ensuring machining accuracy. Two limit plates 103 are provided, which are coaxially fixedly fitted onto the outside of the connecting shaft 101 and the limit shaft 102, respectively. Multiple limit rods 106 are fixedly connected to the side of the limit plate 103 near the hob 4. The hob 4 has multiple limit holes that match the limit rods 106. The ends of the limit rods 106 are chamfered to facilitate the insertion of the limit rods 106 into the limit holes. When the mounting base 104 and the limit shaft 102 are installed on the tool holder 10 by bolts, the insert plate 105 is inserted into the slot. The limiting shaft 102 and the connecting shaft 101 are coaxially connected. The drive shaft 11 and the connecting shaft 101 can drive the limiting shaft 102 to rotate. At this time, the two limiting plates 103 and the two sides of the hob 4 are pressed together to ensure the stability of the hob 4. At the same time, the coaxiality of the hob 4, the limiting shaft 102 and the drive shaft 11 is ensured by multiple limiting rods 106, so that the drive shaft 11 drives the hob 4 to rotate smoothly. The hob 4 is a high-precision hob 4 to ensure the precision machining of gear workpieces. When the hob 4 needs to be replaced, the mounting seat 104 is removed from the tool holder 10 by turning the bolt, and the limiting shaft 102 can be pulled out from the hob 4, so that the hob 4 can be replaced.

[0030] like Figures 1 to 6As shown, the heat insulation cover is fixedly connected to the tool holder 10, and the gear workpiece is located inside the heat insulation cover. The heat insulation cover is a detachable structure, and a machining port for the hobbing cutter 4 to enter is provided on the heat insulation cover. The heat insulation cover includes a bottom cover 201 and a top cover 202. The bottom cover 201 is connected to the worktable 2 and the tool holder 10. A telescopic rod is connected between the bottom cover 201 and the worktable 2. A support frame 203 is fixedly connected to the bottom cover 201, and a telescopic rod is connected between the support frame 203 and the tool holder 10. The telescopic rod between the bottom cover 201 and the worktable 2 allows the heat insulation cover to be raised and lowered. The horizontal position of the insulation cover is limited so that the clamping seat 5 is located inside the insulation cover. The telescopic rod between the bottom cover 201 and the tool holder 10 adapts to the movement of the insulation cover with the worktable 2. At the same time, the tool holder 10 drives the insulation cover to rise and fall, so that the height of the hobbing cutter 4 corresponds to the processing port. Multiple support plates 204 are fixedly connected to the outside of the bottom cover 201, and multiple connecting plates 205 are fixedly connected to the outside of the top cover 202. Insert rods 206 are fixedly connected to the bottom of the connecting plates 205. Insertion holes matching the insert rods 206 are opened on the support plates 204. A magnet 207 is fixedly connected to the top of the support plate 204. The connecting plate 205 is made of iron. The spray pipe 14 is installed on the top of the heat insulation cover and is used to spray cutting fluid onto the gear hobbing position. The bottom cover 201 rises and falls synchronously with the tool holder 10 to align the height of the machining opening with that of the hob 4. The bottom cover 201 and the top cover 202 are made of transparent material, allowing observation of the internal machining process. The spray pipe 14 sprays cutting fluid onto the gear hobbing position to cool the hob 4 and the gear workpiece. At the same time, the heat insulation cover helps to reduce the temperature of the machining position to a certain extent. The temperature is maintained within a certain range to reduce the thermal deformation of the gear workpiece and hob 4. The bottom of the bottom cover 201 has an opening for the clamping seat 5 to pass through, and there is a certain gap between the opening and the clamping seat 5 to allow the cutting fluid and chips to fall down. The top cover 202 has an opening for the positioning block 6 to pass through. The top cover 202 and the bottom cover 201 can be easily disassembled by the attraction of the magnet 207 and the connecting plate 205. The top cover 202 can be removed from the bottom cover 201 to pick up and put down the gear workpiece, or it can be picked up and put down through the machining port.

[0031] like Figure 4As shown, camera 15 is mounted on the side wall of the heat insulation cover for capturing images of the gear workpiece. To reduce interference with the images captured by camera 15, a mounting port is provided on the heat insulation cover. A transparent mounting shell 16 is fixedly connected inside the mounting port, and camera 15 is mounted inside the transparent mounting shell 16. A blowing device for blowing the transparent mounting shell 16 is provided on the heat insulation cover. The blowing device includes a blowing pipe 301, which is mounted on the top of the heat insulation cover and connected to a blowing nozzle 302 for blowing gas onto the transparent mounting shell 16 and the gear workpiece. The camera 15 captures images of the gear workpiece after hobbing and transmits them to the processor. The processor then processes the images... The image is recognized and judged to determine the pitch error and tooth profile deviation of the gear workpiece, which is to monitor the machining accuracy. Multiple blow nozzles 302 are provided to blow the transparent mounting shell 16 and the surface of the gear workpiece, reducing the cutting fluid and burrs on the surface of the transparent mounting shell 16 and the gear workpiece, thereby reducing interference with the captured image and ensuring the accuracy of image analysis. In addition, the gas blown by the blow nozzles 302 can cool the gear workpiece. When the processor judges that the machining accuracy of the gear workpiece has decreased, it will control the gear hobbing machine to stop working in time, check the problem, adjust the position of the gear workpiece, or adjust, repair or replace the hob 4.

[0032] like Figure 3 , Figure 7 and Figure 8As shown, to further ensure the clamping accuracy of the gear workpiece, an anti-offset component is installed inside the heat insulation cover for limiting and sensing the offset of the gear workpiece's side. The anti-offset component includes clamping rings 401, of which multiple clamping rings 401 are provided. Multiple clamping rings 401 move synchronously. Multiple adjusting screws 402 are rotatably connected to the top cover 202. Each clamping ring 401 corresponds to one adjusting screw 402, and the clamping rings 401 and adjusting screws 402 are threadedly connected. The clamping rings 401 and the top cover 202 are also in sliding engagement. Four adjusting screws 402 are provided, and the adjusting screws 402... A driven bevel gear 403 is fixedly connected to the end of the gear. Four driving bevel gears 405 are rotatably connected to the top cover 202 via rotating shafts 404. The driving bevel gears 405 and driven bevel gears 403 correspond one-to-one and mesh. The four rotating shafts 404 are connected by sprocket and chain drive. An adjusting motor 407 is installed on the top cover 202. The output end of the adjusting motor 407 is fixedly connected to one of the rotating shafts 404. The clamping ring 401 contacts the outer wall of the gear workpiece. A displacement sensor 406 is installed on the clamping ring 401. The displacement sensor 406 can sense... The distance between the clamping ring 401 and the base cover 201 can be adjusted by the motor 407, which drives the connected rotating shaft 404 to rotate. Under the transmission of the sprocket and chain, multiple rotating shafts 404 rotate synchronously, thereby driving the drive bevel gear 405 and the driven bevel gear 403 to rotate. This achieves synchronous rotation of multiple adjusting screws 402, causing multiple clamping rings 401 to move synchronously, that is, to move closer to or away from the gear workpiece at the same time. After the gear workpiece is placed on the clamping seat 5, the multiple clamping rings 401 move closer to the gear workpiece synchronously, which can restrict the gear workpiece to the center position of the clamping seat 5. Then, the positioning block 6 lowers the gear workpiece. The gear workpiece is clamped and limited, and then the clamping ring 401 is moved slightly away from the gear workpiece. The displacement sensor 406 is activated to monitor the distance between the clamping ring 401 and the base cover 201. When the gear workpiece deviates from the center position, it will collide with the clamping ring 401 during rotation, and the distance between the clamping ring 401 and the base cover 201 will change. The displacement sensor 406 senses the movement of the clamping ring 401 and the processor controls the gear hobbing machine to stop working in time, so as to position and clamp the gear workpiece to ensure the stability and accuracy of the gear workpiece processing.

[0033] The working principle or usage process of this micro gear hobbing machine is as follows: Remove the top cover 202 from the bottom cover 201, place the gear workpiece on the clamping seat 5, or place the gear workpiece directly on the clamping seat 5 through the machining port, install the top cover 202 above the bottom cover 201, adjust the motor 407 to drive multiple adjusting screws 402 to rotate synchronously, so that multiple clamping rings 401 synchronously press against the gear workpiece, restricting the gear workpiece to the center position of the clamping seat 5, and then the electric cylinder 7 drives the positioning block 6 and the clamping ring 9 to descend. The inverted conical structure of the positioning block 6 limits the center of the gear workpiece to align it with the axis of the clamping seat 5 and the positioning block 6. The clamping ring 9 presses the gear workpiece against the surface of the clamping seat 5 to ensure the horizontal state of the gear workpiece, and then the clamping ring 401 moves away from the gear workpiece at a certain distance. The lead screw feed mechanism drives the worktable 2 and column 3 to approach the hob 4, adjusts the height of the hob 4 to correspond to the height of the gear workpiece, drives the limit shaft 102 and the hob 4 to rotate, and at the same time the clamping seat 5 drives the gear workpiece to rotate, performing gear hobbing on the gear workpiece. During the processing, the spray pipe 14 sprays cutting fluid onto the processing position to cool the gear and the hob 4. At the same time, the cooling equipment delivers cold water into the interior of the limit shaft 102 to cool the limit shaft 102 and the hob 4, reducing the thermal deformation of the gear workpiece and the hob 4, thereby improving the processing accuracy. Camera 15 takes pictures of the processed gear workpiece and transmits the images to the processor. The processor judges the processing deviation, detects the decrease in processing accuracy, and controls the gear hobbing machine to stop working in time. It checks the problem and handles it, adjusting the gear workpiece or repairing or replacing the hob 4. When the gear workpiece deviates, it will collide with the clamping ring 401. The displacement sensor 406 senses the movement of the clamping ring 401 and transmits an electrical signal to the processor to control the gear hobbing machine to stop and adjust the position of the gear workpiece so that its axis is aligned with the clamping seat 5. After processing is completed, the positioning block 6 rises away from the gear workpiece, and the gear workpiece can be taken out from the processing port or by opening the top cover 202.

[0034] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A micro gear hobbing machine, comprising a bed (1), a worktable (2), a column (3), and a hob (4), wherein the worktable (2) is movably disposed on the bed (1), and the column (3) is fixedly connected to the worktable (2), characterized in that, Also includes: Clamping seat (5), which is rotatably mounted on the worktable (2) for mounting gear workpieces; Positioning block (6), which can be raised and lowered on the column (3), the positioning block (6) and the clamping seat (5) are coaxially arranged, and the positioning block (6) is inverted cone shape; The tool holder (10) is height-adjustable and rotatable on the bed (1). A drive shaft (11) is rotatably mounted on the tool holder (10). The hobbing cutter (4) is connected to the drive shaft (11) through a limiting component. The heat insulation cover is fixedly connected to the tool holder (10), the gear workpiece is located inside the heat insulation cover, the heat insulation cover is a detachable structure, and the heat insulation cover has a processing port for the hobbing cutter (4) to enter; Spray pipe (14), which is installed on the top of the heat insulation cover, is used to spray cutting fluid onto the gear hobbing position; A camera (15) is mounted on the side wall of the heat insulation cover and is used to capture images of the gear workpiece.

2. A micro gear hobbing machine according to claim 1, characterized in that, The limiting component includes: A connecting shaft (101) is fixedly connected to the driving shaft (11) on the same axis. The limiting shaft (102) has a mounting hole on the tool holder (10) for the limiting shaft (102) to pass through. The limiting shaft (102) and the connecting shaft (101) are coaxially arranged. The limiting shaft (102) is fixedly connected to the insert plate (105). The connecting shaft (101) has a slot that matches the insert plate (105). The hobbing cutter (4) has a through hole that matches the limiting shaft (102). The limiting shaft (102) is a hollow structure. The limiting shaft (102) is connected to a cold water pipe (12) for conveying cold water into its interior. Limiting plate (103), two limiting plates (103) are provided, and the two limiting plates (103) are coaxially fixedly fitted on the outside of the connecting shaft (101) and the limiting shaft (102).

3. A micro gear hobbing machine according to claim 1, characterized in that, The heat insulation cover has an installation port, and a transparent mounting shell (16) is fixedly connected inside the installation port. The camera (15) is installed inside the transparent mounting shell (16). The heat insulation cover is provided with a blowing component for blowing the transparent mounting shell (16).

4. A micro gear hobbing machine according to claim 3, characterized in that, The purging component includes: A purge pipe (301) is installed on the top of the heat insulation cover. The purge pipe (301) is connected to a purge nozzle (302) for spraying gas onto the transparent mounting shell (16) and the gear workpiece.

5. A micro gear hobbing machine according to claim 2, characterized in that, The limiting plate (103) is fixedly connected to a plurality of limiting rods (106) on the side near the roller (4), and the roller (4) is provided with a plurality of limiting holes that match the limiting rods (106).

6. A micro gear hobbing machine according to claim 1, characterized in that, The heat insulation cover includes: The bottom cover (201) is connected to the workbench (2) and the tool holder (10), and multiple support plates (204) are fixedly connected to the outside of the bottom cover (201). The top cover (202) has multiple connecting plates (205) fixedly connected to its exterior. The bottom of the connecting plate (205) is fixedly connected to a plug rod (206). The support plate (204) has a plug hole that matches the plug rod (206). The top of the support plate (204) is fixedly connected to a magnet (207). The connecting plate (205) is made of iron metal.

7. A micro gear hobbing machine according to claim 1, characterized in that, The positioning block (6) is externally fixedly connected to a fixing plate (8), and the fixing plate (8) is connected to a clamping ring (9) via a clamping spring and a telescopic rod. The clamping ring (9) abuts against the upper surface of the gear workpiece.

8. A micro gear hobbing machine according to claim 1, characterized in that, The heat insulation cover is equipped with an anti-deviation component for limiting and sensing the side of the gear workpiece.

9. A micro gear hobbing machine according to claim 8, characterized in that, The anti-deviation component includes: Clamping ring (401), multiple clamping rings (401) are provided, multiple clamping rings (401) move synchronously, the clamping ring (401) contacts the outer wall of the gear workpiece, and a displacement sensor (406) is installed on the clamping ring (401).

Images