High-precision end cover turning tire expansion tool

Abstract

The utility model provides a kind of high-precision end cover turning tire expansion tool, belong to end cover processing technical field, it solves the technical problems such as existing turning positioning tool cannot accurate positioning installation end cover. Including limiting base plate and tire expansion seat piece and locking assembly, the limiting base plate includes base plate body and the tire expansion inclined table body fixed in the middle part of upper end face of base plate body, tire expansion seat piece is screwed on base plate body and tire expansion seat piece is locked in the upper outer portion of tire expansion inclined table body, locking assembly includes screwing sliding seat and adjusting screw rod, screwing sliding seat is slidably arranged on base plate body, adjusting screw rod is rotatably arranged on base plate body, and screwing sliding seat and adjusting screw rod are screwing cooperation between, the upper end of screwing sliding seat is fixed with mounting seat, locking module is equipped on mounting seat. The utility model can be quickly and accurately accurately to end cover tire expansion positioning installation, guarantee end cover turning precision, simplify operation process, applicable to mass production.

Description

Technical Field

[0001] This utility model belongs to the field of end cap processing technology, and relates to a turning and expanding tooling, particularly a high-precision turning and expanding tooling for end caps. Background Technology

[0002] End cap turning mainly relies on traditional clamping methods such as three-jaw or four-jaw chucks. These methods have inherent drawbacks: chuck positioning errors lead to poor concentricity of the motor end cap workpiece, concentrated clamping force easily deforms thin-walled parts, and each workpiece needs to be individually aligned, resulting in low production efficiency. As the precision and efficiency requirements for end cap parts (such as motor end caps, hydraulic valve covers, and aerospace ring parts) become increasingly stringent, these traditional methods have become a bottleneck for improving product quality and production efficiency, and existing tooling is insufficient to meet the machining requirements of high-precision parts.

[0003] To address this, a high-precision expansion fixture was developed. It uses a tapered sleeve mechanism to drive the elastic expansion sleeve to expand radially uniformly, automatically centering it around the inner hole and providing uniform clamping force. This design overcomes the shortcomings of traditional methods, effectively ensuring extremely high coaxiality, preventing deformation of the motor end cap workpiece, and significantly improving clamping efficiency, making it a solution for high-precision end cap batch processing.

[0004] Therefore, we propose a high-precision end cap turning tool for expanding tires. Utility Model Content

[0005] The purpose of this utility model is to address the aforementioned problems in existing technologies by proposing a high-precision end cap machining expansion tool. The technical problem this utility model aims to solve is: how to achieve rapid, accurate, and precise expansion positioning and installation of end caps, ensuring end cap machining accuracy, simplifying the operation process, and making it suitable for mass production.

[0006] The objective of this utility model can be achieved through the following technical solutions: A high-precision end cap turning tooling for expanding tires includes a limiting base plate, an expanding tire seat, and a locking assembly. The limiting base plate includes a base plate body and an expanding tire ramp fixed to the middle of the upper end face of the base plate body. The expanding tire seat is screwed onto the base plate body and locked above the expanding tire ramp. The locking assembly includes a threaded slide and an adjusting screw. The threaded slide is slidably disposed on the base plate body, and the adjusting screw is rotatably disposed on the base plate body. The threaded slide and the adjusting screw are threadedly engaged. A mounting base is fixed to the upper end of the threaded slide, and a locking module is provided on the mounting base.

[0007] The working principle of this utility model is as follows: the expansion seat is placed on the expansion ramp, the expansion seat is screwed onto the base plate body, and then the motor end cover to be machined is placed on the expansion seat. The bottom of the motor end cover is in close contact with the upper surface of the base plate body, ensuring that the end face of the motor end cover to be machined is flat, thus determining the machining reference of the motor end cover in the axial direction. The expansion seat is locked. The interaction between the expansion platform and the conical surface of the expansion seat generates a huge radial expansion force, which causes the outer cylindrical surface of the expansion seat to expand elastically. This force firmly supports the inner hole of the motor end cover from the inside, locking the motor end cover in the center and ensuring coaxiality. Rotating the adjusting screw pushes the screw-connected slide and its mounting seat towards the motor end cover. The locking module is completely and stably pressed against the motor end cover, and an axial thrust is applied from the side of the motor end cover, achieving high-precision turning.

[0008] The surface roughness of the upper end face of the substrate body is ≤Ra1.6μm. The upper end face of the substrate body is provided with several circumferentially distributed blind holes. The upper end face of the substrate body is provided with a sliding cavity and several positioning screw holes. Rotary bearings are provided at both ends of the sliding cavity. The middle part of the substrate body is provided with expansion screw holes.

[0009] With the above structure, the expansion bolt hole is the core positioning reference of the tooling, used to fix and install the expansion seat. The positional accuracy of the expansion bolt hole directly determines the centering accuracy of the entire expansion system. The sliding cavity and the rotary bearing cooperate to provide a precise linear motion track and support for the locking assembly. The sliding cavity is a guide groove that restricts the screw-in slide to slide only in a straight line, preventing rotation or deflection and ensuring the stability of the locking action. Rotary bearings are installed at both ends of the sliding cavity to support the adjusting screw, allowing it to rotate smoothly and with low resistance. They also bear the axial and radial forces of the screw, ensuring the smoothness and accuracy of the transmission. The positioning screw holes are used to install and fix the substrate body, and to maintain its fixed position during processing. Blind holes are used for weight reduction and avoidance. Weight reduction: While ensuring the strength and rigidity of the substrate structure, the overall weight is reduced, which facilitates the handling and clamping of tooling. Avoidance: During turning, the internal turning tool or chips can get space here to avoid interference or collision with the motor end cover.

[0010] The lower end face of the substrate body is provided with a clearance groove and a thickened platform. The clearance groove is located inside the thickened platform. The thickened platform is provided with a number of circumferentially distributed positioning blind holes and a number of circumferentially distributed top-fitting conical holes. The top-fitting conical holes and positioning blind holes are staggered. The expansion screw hole is connected to the clearance groove.

[0011] With the above structure, the thickened platform is the main area where the tooling contacts and is fixed to the end face of the machine tool spindle; the thickened design ensures sufficient strength and rigidity to prevent deformation or vibration under cutting forces; The positioning blind hole engages with the positioning pin on the machine tool spindle connecting plate; through the precise engagement of the pin and the hole, the angular position of the tooling on the machine tool is determined, preventing the tooling from rotating and ensuring the repeatability of positioning accuracy for each installation. The top-fitting tapered hole is used to install the tapered tie rod of the liquid plastic tensioning mechanism. When the tie rod is tightened, the tapered head of the tie rod is inserted into the tapered hole. The characteristics of the tapered surface fit generate a huge centripetal force, which pulls the tooling tightly toward and fits against the end face of the machine tool spindle. This fit not only provides a strong locking force, but also plays an auxiliary centering role, ensuring that the tooling axis coincides with the spindle axis. The clearance groove provides space for structures that may protrude on the end face of the machine tool spindle, ensuring that the thickened platform of the tooling can be completely and flatly attached to the main mounting surface of the machine tool. This is the key to ensuring connection rigidity and accuracy. The expansion bolt hole is connected to the clearance groove, which facilitates installation and provides tool operating space. When fixing the expansion bolt seat by passing through the expansion bolt hole from top to bottom, this connection design provides an operating channel for the installation tool, while also preventing the bolt head from interfering with the machine tool spindle.

[0012] The expansion ramp is a truncated cone with a smaller top and a larger bottom. The interior of the expansion ramp is provided with a clearance through hole, which is connected to the expansion screw hole.

[0013] With the above structure, the core function of the frustum design is to convert axial sliding into radial expansion. The space between the expansion platform and the inner conical surface of the external expansion seat is compressed, thereby forcing the external expansion seat to undergo radial elastic expansion, ultimately tightening the inner hole of the motor end cover. The core function of avoiding the through hole is to reduce weight and provide an installation channel. Weight reduction: Reduces the overall weight of the tooling, making it easier to operate. Installation channel: It connects to the expansion screw hole on the base plate body and is used to install the expansion seat, locking the expansion seat onto the expansion platform, ensuring that the expansion seat will not loosen and is stable and reliable.

[0014] The expansion seat includes an expansion seat body, an expansion top platform fixed at the upper end of the expansion seat body, and an internal hexagon bolt that penetrates the expansion seat body and the expansion top platform. Several circumferentially distributed, integrally formed expansion adjustment valves are fixed at the lower end of the expansion seat body, forming an expansion cylinder. The inner sides of the expansion seat body and the several expansion adjustment valves are provided with expansion ramp holes, which are truncated cone holes with a smaller upper part and a larger lower part. The size of the expansion ramp holes matches the size of the expansion ramp body.

[0015] With the above structure, the expansion adjustment valve is a circumferentially distributed, integrally formed valve structure, which actually cuts the lower part of the expansion seat body into multiple "elastic fingers". The expansion ramp hole is a frustum-shaped hole with a smaller upper part and a larger lower part. It forms a force conversion pair with the expansion ramp body. Its size matches the expansion ramp body to form a precise conical surface fit. When the expansion ramp body moves axially in the hole, the relative motion between the two conical surfaces is forcibly converted into the radial expansion of the expansion adjustment valve.

[0016] Several expansion adjustment valves form an expansion cylinder as a working surface for positioning and clamping. In the free state, the outer diameter of this cylinder is slightly smaller than the inner hole of the motor end cover, making it easy to insert the motor end cover. When the valves expand, the cylindrical surface will evenly fit into the inner hole of the motor end cover, achieving high-precision centering and large-area surface contact clamping, resulting in stable clamping and minimal deformation. The internal hex bolts secure the tire expansion seat to the limiting base plate, pass through the entire tire expansion seat, and screw the lower end into the positioning screw hole of the base plate body. This allows the tire expansion seat to move down along the tire expansion ramp, ensuring that only the tire expansion adjustment valve undergoes elastic deformation during operation. The expansion joint structure strengthens and provides a bolt mounting platform, increasing the rigidity of the upper end and providing a bearing surface for the head of the hexagonal socket head cap screws.

[0017] The screw-in slide is slidably disposed inside the sliding cavity, and the adjusting screw is fixedly disposed inside the two rotary bearings. The adjusting screw is located inside the sliding cavity, and the end of the adjusting screw extends out of the base plate body. A handwheel is fixed to the end of the adjusting screw.

[0018] With the above structure, screw in the handwheel: the operator rotates the handwheel clockwise, causing the adjusting screw to rotate smoothly under the support of the rotary bearing; Since the screw-connected slide block is restricted from rotating by the sliding cavity, it moves linearly along the sliding cavity towards the motor end cover under the drive of the screw thread; The screw-in slide pushes the mounting base and locking module on it, ultimately applying axial thrust to the motor end cover and initiating the entire tensioning process; Loosening process: Turn the handwheel counterclockwise, and the above process will be reversed. The screw-connected slide will retract, and the locking force will be released.

[0019] The mounting base is L-shaped. The locking module includes a slide rail, two slider limiting posts 1 and two slider limiting posts 2. The slide rail, two slider limiting posts 1 and two slider limiting posts 2 are all fixed to the upper end of the mounting base. The two slider limiting posts 1 and two slider limiting posts 2 are located at the front and rear ends of the slide rail, respectively. A slider is slidably mounted on the upper end of the slide rail. A hinged bracket is fixed to the upper end of the slider. A U-shaped hinged rotating seat is hinged to the end of the hinged bracket. Two symmetrically arranged tightening wheels are rotatably mounted on the end of the hinged rotating seat. A tightening shaft is fixed to the side end of the slider. The tightening shaft is slidably mounted on the mounting base. A tightening spring is sleeved on the tightening shaft. The two ends of the tightening spring abut against and hang on the slider and the mounting base, respectively. The slider is located between the two slider limiting posts 1 and the two slider limiting posts 2.

[0020] With the above structure, the forward contact is achieved by rotating the handwheel, which moves the entire mounting base forward until the clamping wheel contacts the motor end cover. The clamping wheel is designed to roll after contacting the motor end cover, reducing friction and facilitating fine-tuning. Automatic leveling: Due to the slight non-perpendicularity of the motor end cover face, the pressure of the clamping wheel is transmitted through the hinged rotating seat and the hinged locking seat; the hinged rotating seat is rotatably connected to the clamping wheel shaft, and the hinged locking seat is hingedly connected to the hinged rotating seat; these two-stage hinge / rotation structure give the clamping wheel great flexibility, allowing it to swing automatically like a universal joint until the working surface of the clamping wheel is completely in contact with the motor end cover face, thus ensuring that the clamping force is always perpendicular to the contact point; When the clamping wheel contacts the motor end cover, the force of the screw-in slide continuing to advance further compresses the clamping spring. The compression of the spring generates a continuous and gentle clamping force on the motor end cover. The advantages of this design are: cushioning: preventing damage to the motor end cover or tooling from excessive impact; constant force: even if the motor end cover experiences slight thermal expansion or vibration during processing, the spring can maintain a relatively stable clamping force; safety: in case of overload, the spring will be fully compressed, providing protection; stable locking: the spring force remains constant, the slider is limited to a reasonable position by the limit post, and the motor end cover is stably pressed against the limit plate. The slide rail ensures that the slider can only slide smoothly in a straight line, providing precise guidance for the compression and release of the spring; slider limit post one and slider limit post two are located at the front and rear of the slider respectively, and their function is to limit the sliding stroke of the slider, prevent it from falling off the slide rail or rebounding excessively under the action of the spring, and ensure the reliability of the mechanism. Loosen the motor end cover: reverse the handwheel, the mounting base moves back, the clamping spring returns to its original position, and the clamping wheel moves away from the motor end cover.

[0021] Compared with existing technologies, this high-precision end cap turning tooling for expanding tires has the following advantages: This tooling's unique conical tensioning mechanism can precisely convert axial locking force into uniform radial expansion force, ensuring that the inner hole of the motor end cover is centered, thereby effectively guaranteeing high coaxiality and roundness after machining; at the same time, the motor end cover uses the precision-machined substrate end face as the axial reference, forming a unified and reliable positioning system.

[0022] This solution combines excellent rigidity with operational safety. The motor end cover is simultaneously subjected to radial expansion and axial flexible compression, forming a stable over-positioning and significantly suppressing cutting vibration. The spring and hinge design of the locking module adapts to the end face of the motor end cover, providing buffered clamping force and effectively preventing clamping deformation and surface damage, ensuring high safety.

[0023] This fixture significantly improves clamping efficiency. The motor end cover only needs to be placed once, and positioning and locking can be quickly completed by tightening the hex bolts and turning the handwheel. The steps are simple, greatly reducing auxiliary time. The integrated design simplifies the operation process and is suitable for mass production.

[0024] This tooling, through ingenious mechanical integration, combines the advantages of high-precision positioning, rigid clamping, flexible pressing, and rapid operation, fundamentally solving the clamping problem in precision end cap turning and providing a solution for achieving high-quality and high-efficiency machining. Attached Figure Description

[0025] Figure 1 This is a three-dimensional structural diagram of the present invention in use.

[0026] Figure 2 This is a cross-sectional structural diagram of the present invention in use.

[0027] Figure 3 This is an exploded structural diagram of the present invention.

[0028] Figure 4 This is a schematic diagram of the structure of the limiting substrate in this utility model.

[0029] Figure 5 This is a three-dimensional structural diagram of the upper side of the tire expansion seat component in this utility model.

[0030] Figure 6 This is a three-dimensional structural diagram of the lower side of the tire expansion seat component in this utility model.

[0031] Figure 7 This is a three-dimensional structural diagram of the locking component in this utility model.

[0032] In the figure, 1. Limiting base plate; 2. Tire expansion seat; 3. Locking assembly; 4. Motor end cover; 5. Base plate body; 6. Sliding cavity; 7. Rotary bearing; 8. Clearance blind hole; 9. Tire expansion ramp; 10. Clearance through hole; 11. Positioning screw hole; 12. Thickened platform; 13. Top engagement cone hole; 14. Positioning blind hole; 15. Tire expansion screw hole; 16. Clearance groove; 17. Tire expansion seat body; 18. 19. Tire expansion platform; 20. Hex socket head cap bolt; 21. Tire expansion adjustment valve body; 22. Tire expansion ramp hole; 23. Screw-in slide block; 24. Mounting base; 25. Adjustment screw; 26. Handwheel; 27. Tightening spring; 28. Tightening shaft; 29. ​​Slider limit post one; 30. Hinge bracket; 31. Hinge rotating seat; 32. Tightening wheel; 33. Slide rail; 34. Slider limit post two; 35. Slider. Detailed Implementation

[0033] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0034] like Figures 1-7 As shown, this high-precision end cap turning expansion tire fixture includes a limiting base plate 1, an expansion tire seat 2, and a locking assembly 3. The limiting base plate 1 includes a base plate body 5 and an expansion tire ramp 9 fixed to the middle of the upper end face of the base plate body 5. The expansion tire seat 2 is screwed onto the base plate body 5 and locked onto the upper outside of the expansion tire ramp 9. The locking assembly 3 includes a screw-in slide 22 and an adjusting screw 24. The screw-in slide 22 is slidably disposed on the base plate body 5, and the adjusting screw 24 is rotatably disposed on the base plate body 5. The screw-in slide 22 and the adjusting screw 24 are screwed together. A mounting base 23 is fixed to the upper end of the screw-in slide 22, and a locking module is provided on the mounting base 23.

[0035] The expansion seat 2 is placed on the expansion inclined table 9 and screwed onto the base plate body 5. Then the motor end cover 4 to be machined is placed on the expansion seat 2. The bottom of the motor end cover 4 is in close contact with the upper surface of the base plate body 5, ensuring that the end face of the motor end cover 4 to be machined is flat, thus determining the machining reference of the motor end cover 4 in the axial direction. The expansion seat 2 is locked. The expansion ramp 9 and the conical surface of the expansion seat 2 interact to generate a huge radial expansion force, which causes the outer cylindrical surface of the expansion seat 2 to expand elastically. This force firmly supports the inner hole of the motor end cover 4 from the inside of the motor end cover 4, locking the motor end cover 4 in the center to ensure coaxiality. Rotating the adjusting screw 24 pushes the screw-connected slide 22 and its mounting seat 23 toward the motor end cover 4, and the locking module is completely and stably abutted against the motor end cover 4, applying an axial thrust from the side of the motor end cover 4; thus achieving "high-precision" turning.

[0036] The surface roughness of the upper end face of the substrate body 5 is ≤Ra1.6μm. Several circumferentially distributed blind holes 8 are provided on the upper end face of the substrate body 5. A sliding cavity 6 and several positioning screw holes 11 are provided on the upper end face of the substrate body 5. Rotary bearings 7 are provided at both ends of the sliding cavity 6. An expansion screw hole 15 is provided in the middle of the substrate body 5.

[0037] The expansion screw hole 15 is the core positioning reference of the tooling, used to fix and install the expansion seat 2. The positional accuracy of the expansion screw hole 15 directly determines the centering accuracy of the entire expansion system. The sliding cavity 6 cooperates with the rotary bearing 7 to provide a precise linear motion track and support for the locking assembly 3; the sliding cavity 6 is a guide groove that restricts the "screwed slide 22" to slide only in a straight line, preventing rotation or deflection and ensuring the stability of the locking action; Rotary bearings 7 are installed at both ends of the sliding cavity to support the "adjusting screw 24" so that it can rotate smoothly and with low resistance, while bearing the axial and radial forces of the screw to ensure the smoothness and accuracy of the transmission. The positioning screw hole 11 is used to install and fix the substrate body 5, and to maintain its fixed position during processing. The avoidance blind hole 8 is used for weight reduction and avoidance. Weight reduction: While ensuring the strength and rigidity of the substrate structure, the overall weight is reduced, which facilitates the handling and clamping of tooling. Avoidance: During turning, the internal turning tool or chips can obtain space here to avoid interference or collision with the motor end cover 4.

[0038] The lower end face of the substrate body 5 is provided with a clearance groove 16 and a thickened platform 12. The clearance groove 16 is located inside the thickened platform 12. The thickened platform 12 is provided with a number of circumferentially distributed positioning blind holes 14 and a number of circumferentially distributed top-fitting conical holes 13. The top-fitting conical holes 13 and the positioning blind holes 14 are staggered. The expansion screw hole 15 is connected to the clearance groove 16.

[0039] The thickened platform 12 is the main area where the tooling contacts and is fixed to the end face of the machine tool spindle (such as a faceplate or transition plate); the thickened design ensures sufficient strength and rigidity to prevent deformation or vibration under cutting forces. The positioning blind hole 14 engages with the positioning pin on the machine tool spindle connecting plate; through the precise engagement of the pin and the hole, the angular position (circumferential direction) of the tooling on the machine tool is determined, preventing the tooling from rotating and ensuring the repeatability of positioning accuracy for each installation. The top-fitting tapered hole 13 is used to install the tapered tie rod (or similar structure) of the liquid plastic tensioning mechanism; when the tie rod is tightened, the tapered head of the tie rod is inserted into the tapered hole, and the characteristics of the tapered surface fit generate a huge centripetal force, which pulls the tooling tightly toward and fits against the end face of the machine tool spindle; this fit not only provides a strong locking force, but also plays an auxiliary centering role, ensuring that the tooling axis coincides with the spindle axis; The clearance groove 16 provides space for structures that may protrude on the end face of the machine tool spindle (such as the central journal, bolt head, etc.), ensuring that the thickened platform 12 of the tooling can be completely and flatly attached to the main mounting surface of the machine tool. This is the key to ensuring connection rigidity and accuracy. The expansion bolt hole 15 is connected to the relief groove 16, which facilitates installation and provides tool operating space. When the expansion bolt seat 2 is fixed by passing through the expansion bolt hole 15 from top to bottom, this connection design provides an operating channel for installation tools (such as long Allen wrenches) and also avoids interference between the bolt head and the machine tool spindle.

[0040] The expansion ramp 9 is a frustum-shaped body with a smaller top and a larger bottom. The expansion ramp 9 has a clearance through hole 10 inside, which is connected to the expansion screw hole 15.

[0041] The core function of the conical design (a truncated cone with a smaller top and a larger bottom) is to convert axial sliding into radial expansion. The space between the expansion platform 9 and the inner conical surface of the external expansion seat 2 is compressed, thereby forcing the external expansion seat 2 to undergo radial elastic expansion, ultimately tightening the inner hole of the motor end cover 4. The core function of the avoidance through hole 10 is to reduce weight and provide an installation channel. Weight reduction: Reduces the overall weight of the tooling, making it easier to operate. Installation channel: It is connected to the expansion screw hole 15 on the base plate body 5 and is used to install the expansion seat 2, locking the expansion seat 2 onto the expansion platform 9, ensuring that the expansion seat 2 will not loosen and is stable and reliable.

[0042] The tire expansion seat 2 includes a tire expansion seat body 17. A tire expansion top platform 18 is fixed to the upper end of the tire expansion seat body 17. An internal hexagon bolt 19 is fixed on the tire expansion top platform 18, penetrating the tire expansion seat body 17 and the tire expansion top platform 18. Several circumferentially distributed, integrally formed tire expansion adjustment valves 20 are fixed to the lower end of the tire expansion seat body 17. The several tire expansion adjustment valves 20 form a tire expansion cylinder. The inner side of the tire expansion seat body 17 and the several tire expansion adjustment valves 20 is provided with a tire expansion ramp hole 21. The tire expansion ramp hole 21 is a frustum hole with a smaller upper part and a larger lower part. The size of the tire expansion ramp hole 21 matches the size of the tire expansion ramp body 9.

[0043] The expansion adjustment valve 20 is a circumferentially distributed, integrally formed valve structure, which actually cuts the lower part of the expansion seat body 17 into multiple "elastic fingers". The expansion ramp hole 21 is a frustum hole with a smaller upper part and a larger lower part. It forms a force conversion pair with the expansion ramp body 9. Its size matches the expansion ramp body 9 to form a precise conical surface fit. When the expansion ramp body 9 moves axially in the hole, the relative motion between the two conical surfaces is forcibly converted into the radial expansion of the expansion adjustment valve body 20. Several expansion adjustment valves 20 form an expansion cylinder as a working surface for positioning and clamping. In the free state, the outer diameter of this cylinder is slightly smaller than the inner hole of the motor end cover 4, which makes it easy to insert the motor end cover 4. When the valve expands, the cylindrical surface will evenly fit the inner hole of the motor end cover 4, achieving high-precision centering and large-area surface contact clamping, stable clamping, and small deformation. The internal hex bolt 19 secures the tire expansion seat 2 to the limiting base plate 1 as a whole, passes through the entire tire expansion seat, and is screwed into the positioning screw hole 11 of the base plate body 5 at the lower end. This causes the tire expansion seat 2 to move down along the tire expansion ramp 9, ensuring that only the tire expansion adjustment valve 20 undergoes elastic deformation during operation. The expansion joint 18 provides structural reinforcement and a bolt mounting platform, increases the rigidity of the upper end, and provides a bearing surface for the head of the internal hex bolt 19.

[0044] The screw-in slide 22 is slidably disposed inside the sliding cavity 6, the adjusting screw 24 is fixedly disposed inside the two rotary bearings 7, and the adjusting screw 24 is located inside the sliding cavity 6. The end of the adjusting screw 24 extends out of the base plate body 5, and a handwheel 25 is fixed to the end of the adjusting screw 24.

[0045] The operator rotates the handwheel 25 clockwise, causing the adjusting screw 24 to rotate smoothly under the support of the rotary bearing 7; Since the screw-connected slide block 22 is restricted from rotating by the sliding cavity 6, it moves linearly along the sliding cavity towards the motor end cover 4 under the drive of the screw thread. The screw-in slide 22 pushes the mounting base 23 and locking module on it, and finally applies axial thrust to the motor end cover 4, starting the entire tensioning process; Loosening process: Turn the handwheel counterclockwise, and the above process will be reversed. The screw-connected slide will retract, and the locking force will be released.

[0046] Mounting base 23 is L-shaped. The locking module includes a slide rail 32, two slider limiting posts 28 and two slider limiting posts 33. The slide rail 32, the two slider limiting posts 28 and the two slider limiting posts 33 are all fixed to the upper end of the mounting base 23. The two slider limiting posts 28 and the two slider limiting posts 33 are located at the front and rear ends of the slide rail 32, respectively. A slider 34 is slidably mounted on the upper end of the slide rail 32. A hinged bracket 29 is fixed to the upper end of the slider 34. The end of 9 is hinged with a U-shaped hinge seat 30. The end of the hinge seat 30 is provided with two symmetrically arranged clamping wheels 31. The side end of the slider 34 is fixed with a clamping shaft 27. The clamping shaft 27 is slidably mounted on the mounting base 23. A clamping spring 26 is sleeved on the clamping shaft 27. The two ends of the clamping spring 26 respectively abut against and hang on the slider 34 and the mounting base 23. The slider 34 is located between two slider limiting posts 1 28 and two slider limiting posts 2 33.

[0047] Forward contact: Turning the handwheel 25, the mounting base 23 moves forward as a whole, and the top clamping wheel 31 contacts the motor end cover 4; the design of the top clamping wheel 31 allows it to roll after contacting the motor end cover 4, reducing friction and facilitating fine adjustment; Automatic leveling: Due to the slight non-perpendicularity of the end face of the motor end cover 4, the pressure of the clamping wheel 31 is transmitted through the hinged rotating seat 30 and the hinged retainer 29; the hinged rotating seat 30 is rotatably connected to the clamping wheel shaft, and the hinged retainer 29 is hingedly connected to the hinged rotating seat 30; these two-stage hinge / rotation structure give the clamping wheel great flexibility, allowing it to swing automatically like a universal joint until the working surface of the clamping wheel is completely in contact with the end face of the motor end cover 4, thereby ensuring that the clamping force is always perpendicular to the contact point; When the clamping wheel contacts the motor end cover 4, the force of the screw-in slide 22 continuing to advance will further compress the clamping spring 26. The compression of the spring generates a continuous and gentle clamping force on the motor end cover 4. The advantages of this design are: buffering: preventing excessive impact from damaging the motor end cover 4 or the tooling; constant force: even if the motor end cover 4 experiences slight thermal expansion or vibration during processing, the spring can maintain a relatively stable clamping force; safety: in case of overload, the spring will be fully compressed, providing protection; stable locking: the spring force remains constant, the slider is limited to a reasonable position by the limit post, and the motor end cover 4 is stably pressed against the limit base plate 1. The slide rail 32 ensures that the slider 34 can only slide smoothly along a straight line, providing precise guidance for the compression and release of the spring; the slider limit post 1 28 and the slider limit post 2 33 are located at the front and rear of the slider respectively, and their function is to limit the sliding stroke of the slider 34, prevent it from falling off the slide rail or rebounding excessively under the action of the spring, and ensure the reliability of the mechanism. Loosen the motor end cover 4: reverse the handwheel 25, the mounting base 23 moves backward, the clamping spring 26 returns to its original position, and the clamping wheel leaves the motor end cover 4.

[0048] The working principle of this utility model: I. Overall Workflow of Tooling The entire process can be divided into three main stages: installation preparation, expansion and centering, and axial locking.

[0049] Step 1: Install the tooling on the machine tool (establish machining reference) The tooling itself first needs to be precisely fixed to the lathe spindle.

[0050] Align the lower end face of the tooling base plate body 5 with the machine tool spindle interface.

[0051] The angular position of the tooling is determined by using the positioning blind hole 14 in conjunction with the positioning pin on the machine tool to prevent rotation.

[0052] The thickened platform 12 of the tooling is rigidly tightened onto the machine tool spindle by using a tensioning mechanism embedded in the top conical hole 13 and the huge centripetal force generated by the conical surface mating.

[0053] The clearance groove 16 ensures that the protrusions on the machine tool spindle will not interfere, allowing the tool end face to fit completely and guaranteeing high-precision alignment between the tool axis and the spindle axis.

[0054] Step 2: Clamping and radial tightening of motor end cover 4 (achieving precision centering) The motor end cover 4 to be processed is placed on the outer cylindrical surface of the expansion seat 2 (i.e., the cylinder formed by several expansion adjustment valves 20).

[0055] The lower end face of the motor end cover 4 is placed tightly against the upper end face of the substrate body 5; this precision-machined (Ra≤1.6μm) base surface establishes the machining reference of the motor end cover 4 in the axial (Z direction).

[0056] Tighten the internal hex bolt 19 to move the entire expansion seat 2 axially downward.

[0057] Since the expansion seat 2 is fixed, the expansion ramp hole 21 (a tapered hole with a smaller upper part and a larger lower part) inside it moves relative to the expansion ramp body 9 (a tapered body with a smaller upper part and a larger lower part) fixed on the base plate.

[0058] The conical surface engagement forces the tire expansion regulating valve 20 to produce uniform radial elastic expansion, much like multiple "fingers" simultaneously spreading outwards.

[0059] The expanded outer cylindrical surface of the valve tightly hugs the inner hole of the motor end cover 4, achieving precise centering of the motor end cover 4 in the radial (X / Y direction) direction and providing a huge clamping force to ensure roundness during processing.

[0060] Step 3: Axial flexible locking (final fixation completed) Rotating the handwheel 25 clockwise causes the adjusting screw 24 to rotate smoothly under the support of the rotary bearing 7.

[0061] The rotation of the adjusting screw 24 drives the threaded slide block 22, which is in mate with it, to move linearly along the guide rail formed by the sliding cavity 6 toward the motor end cover 4.

[0062] The screw-in slide 22 pushes the mounting base 23 and the entire locking module forward.

[0063] The working process of the locking module: The top clamping wheel 31 first contacts the end face of the motor end cover 4.

[0064] Through the two-stage hinge / rotation structure of the hinged swivel seat 30 and the hinged card seat 29, the clamping wheel can swing adaptively to ensure that its working surface is completely in contact with the end face of the motor end cover 4, so that the clamping force is perpendicular to the contact point.

[0065] The force of the continued forward movement compresses the clamping spring 26, and the spring force is transmitted to the clamping wheel through the clamping shaft 27 and the slider 34, forming a flexible and constant axial clamping force that firmly presses the motor end cover 4 against the limiting plate.

[0066] The slide rail 32 ensures linear motion, and the slider limit post 1 28 and slider limit post 2 33 prevent excessive slider travel.

[0067] II. Core of the Working Principle Force conversion mechanism: The core of the tooling is the conical surface fit (sloping platform body and sloping platform hole); it efficiently converts the simple axial bolt locking force (internal hex bolt 19 and adjusting screw 24) into the required radial expansion force, with a compact structure and significant force amplification effect.

[0068] Accuracy guarantee mechanism: Unified reference: The tooling is connected to the machine tool through the lower end face, and the upper end face serves as the reference for the motor end cover 4. All accuracy is traceable to the machine tool spindle, avoiding cumulative errors.

[0069] Full positioning: The motor end cover 4 is radially expanded (centering) and axially pressed (end face fixing), which restricts all degrees of freedom, forming over-positioning and effectively suppressing processing vibration.

[0070] Flexible design: The spring and hinge design of the locking module is key. It avoids clamping deformation or damage caused by slight unevenness of the four end faces of the motor end cover or excessive operating force, and achieves "overload protection" and "constant force clamping", which is particularly suitable for precision machining.

[0071] In summary, the unique conical tensioning mechanism of this tooling can accurately convert the axial locking force into a uniform radial expansion force, ensuring that the inner hole of the motor end cover 4 is centered, thereby effectively guaranteeing high coaxiality and roundness after machining. At the same time, the motor end cover 4 uses the precision-machined substrate end face as the axial reference, forming a unified and reliable positioning system.

[0072] This design combines excellent rigidity with operational safety. The motor end cover 4 is simultaneously subjected to radial expansion and axial flexible compression, forming a stable over-positioning and significantly suppressing cutting vibration. The spring and hinge design of the locking module can adapt to the end face of the motor end cover 4, providing buffered clamping force and effectively preventing clamping deformation and surface damage, ensuring high safety.

[0073] This fixture significantly improves clamping efficiency. The motor end cover 4 only needs to be placed once, and positioning and locking can be quickly completed by tightening the hex bolts 19 and turning the handwheel 25. The steps are simple, greatly reducing auxiliary time. The integrated design simplifies the operation process and is suitable for mass production.

[0074] This tooling, through ingenious mechanical integration, combines the advantages of high-precision positioning, rigid clamping, flexible pressing, and rapid operation, fundamentally solving the clamping problem in precision end cap turning and providing a solution for achieving high-quality and high-efficiency machining.

[0075] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to replace them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A high-precision end cap turning fixture for expanding tires, comprising a limiting base plate (1), an expanding tire seat (2), and a locking assembly (3), characterized in that, The limiting base plate (1) includes a base plate body (5) and an expansion tire ramp (9) fixed in the middle of the upper end face of the base plate body (5). The expansion tire seat (2) is screwed onto the base plate body (5) and locked onto the upper outside of the expansion tire ramp (9). The locking assembly (3) includes a screw-in slide (22) and an adjusting screw (24). The screw-in slide (22) is slidably disposed on the base plate body (5), and the adjusting screw (24) is rotatably disposed on the base plate body (5). The screw-in slide (22) and the adjusting screw (24) are screwed together. The upper end of the screw-in slide (22) is fixed with a mounting base (23), and the mounting base (23) is provided with a locking module.

2. The high-precision end cap turning and tire expanding tooling according to claim 1, characterized in that, The surface roughness of the upper end face of the substrate body (5) is less than or equal to Ra1.6μm. The upper end face of the substrate body (5) is provided with several circumferentially distributed blind holes (8). The upper end face of the substrate body (5) is provided with a sliding cavity (6) and several positioning screw holes (11). Both ends of the sliding cavity (6) are provided with rotary bearings (7). The middle part of the substrate body (5) is provided with expansion screw holes (15).

3. The high-precision end cap turning and tire expanding tooling according to claim 2, characterized in that, The lower end face of the substrate body (5) is provided with a clearance groove (16) and a thickened platform (12). The clearance groove (16) is located inside the thickened platform (12). The thickened platform (12) is provided with a number of circumferentially distributed positioning blind holes (14) and a number of circumferentially distributed top-fitting conical holes (13). The top-fitting conical holes (13) and positioning blind holes (14) are staggered. The expansion screw hole (15) is connected to the clearance groove (16).

4. The high-precision end cap turning tooling for expanding tires according to claim 3, characterized in that, The expansion ramp body (9) is a frustum with a smaller top and a larger bottom. The expansion ramp body (9) has a clearance through hole (10) inside, which is connected to the expansion screw hole (15).

5. The high-precision end cap turning and tire expanding tooling according to claim 4, characterized in that, The expansion seat component (2) includes an expansion seat body (17), an expansion top platform (18) is fixed at the upper end of the expansion seat body (17), an internal hexagon bolt (19) is fixed on the expansion top platform (18) and the expansion top platform (18), and several circumferentially distributed expansion adjustment valves (20) integrally formed therewith are fixed at the lower end of the expansion seat body (17), the several expansion adjustment valves (20) form an expansion cylinder, and expansion inclined platform holes (21) are provided on the inner side of the expansion seat body (17) and the several expansion adjustment valves (20). The expansion inclined platform holes (21) are frustum holes with smaller upper part and larger lower part, and the size of the expansion inclined platform holes (21) matches the size of the expansion inclined platform body (9).

6. The high-precision end cap turning tooling for expanding tires according to claim 5, characterized in that, The screw-in slide (22) is slidably disposed inside the sliding cavity (6), the adjusting screw (24) is fixedly disposed inside the two rotary bearings (7), and the adjusting screw (24) is located inside the sliding cavity (6). The end of the adjusting screw (24) extends out of the base plate body (5), and a handwheel (25) is fixed to the end of the adjusting screw (24).

7. A high-precision end cap turning tooling for expanding tires according to claim 6, characterized in that, The mounting base (23) is L-shaped. The locking module includes a slide rail (32), two slider limiting posts one (28), and two slider limiting posts two (33). The slide rail (32), the two slider limiting posts one (28), and the two slider limiting posts two (33) are all fixed to the upper end of the mounting base (23). The two slider limiting posts one (28) and the two slider limiting posts two (33) are located at the front and rear ends of the slide rail (32), respectively. A slider (34) is slidably provided on the upper end of the slide rail (32). A hinged bracket (29) is fixed on the upper end of the slider (34). 29) has a U-shaped hinge seat (30) at its end. The hinge seat (30) has two symmetrically arranged top clamping wheels (31) at its end. The side end of the slider (34) is fixed with a top clamping shaft (27). The top clamping shaft (27) is slidably mounted on the mounting base (23). A top clamping spring (26) is sleeved on the top clamping shaft (27). The two ends of the top clamping spring (26) abut against the slider (34) and the mounting base (23) respectively. The slider (34) is located between two slider limiting posts one (28) and two slider limiting posts two (33).

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