Drilling mechanism for cast iron flywheel machining

Abstract

The utility model discloses a kind of drilling mechanism for cast iron flywheel processing, including workbench, positioning mechanism and multiple limiting mechanisms. Positioning mechanism realizes flywheel circumferential accurate indexing by servo motor and synchronous belt drive rotating shaft, realizes circumferential multi-hole automatic positioning;Limiting mechanism adopts double limiting wheel cooperation hinged strip and threaded rod, different diameter flywheel can be self-adapting clamped, then double-shaft air cylinder rim limiting wheel is pushed, flywheel outer edge is clamped from upper and lower two sides, prevent axial / radial deviation when drilling. Rotating shaft is hollow structure, connect negative pressure equipment, and drill dust is sucked in real time through dust suction hole and dust suction groove. X-shaped reinforcing rib is provided in fixed frame to improve rigidity, and compression spring ensures that limiting wheel adjustment is stable. The mechanism integrates automatic indexing, flexible clamping, efficient dust extraction, significantly improves drilling accuracy, efficiency and equipment reliability, and is suitable for flywheel batch intelligent manufacturing.

Description

Technical Field

[0001] This utility model relates to the technical field of flywheel machining, specifically to a drilling mechanism for machining cast iron flywheels. Background Technology

[0002] As a key rotating component in internal combustion engines or hybrid power systems, the flywheel's quality directly affects the engine's smoothness, starting performance, and energy storage efficiency. During flywheel manufacturing, the circumferentially distributed mounting holes (such as bolt holes and locating pin holes) are the core structure for achieving precise connection with the crankshaft or clutch. Their positional accuracy, hole spacing consistency, and surface quality are crucial for the overall assembly and operation of the machine. Traditional flywheel drilling is mostly completed using general-purpose radial drilling machines with special fixtures. The operation relies on manual clamping, manual indexing, or simple locating pins, which presents the following prominent problems: First, the positioning accuracy is low and repeatability is poor. Manual alignment is easily affected by the operator's experience, and it is difficult to compensate for after the fixture wears out, leading to accumulated errors in the hole position and affecting dynamic balance. Second, the clamping efficiency is low. Each time the workpiece is changed, it needs to be re-aligned and locked, resulting in long cycle times and making it difficult to meet the needs of mass production. Third, there is a lack of effective chip management. Drilling cast iron generates a large amount of fine dust and chips, which easily accumulate on the positioning surface or hole opening, not only affecting subsequent measurement and assembly, but also potentially scratching the workpiece surface or accelerating guide rail wear.

[0003] Although some specialized drilling equipment has introduced servo indexing and pneumatic clamping, it generally suffers from problems such as inability to adapt to different flywheel specifications and lack of chip suction function.

[0004] Therefore, there is an urgent need for a dedicated drilling mechanism that integrates high-precision servo indexing, adaptive flexible clamping, and efficient chip extraction to improve flywheel machining quality. Utility Model Content

[0005] The purpose of this invention is to provide a drilling mechanism for machining cast iron flywheels, so as to solve the above-mentioned defects caused by the prior art.

[0006] A drilling mechanism for machining cast iron flywheels, comprising: Workbench; The positioning mechanism is located on the upper side of the worktable and includes a bearing seat, a rotating shaft, a positioning seat, and a servo motor. The rotating shaft is rotatably connected to the center of the worktable through the bearing seat. The positioning seat is coaxially connected to the top of the rotating shaft. The servo motor is installed on the lower side of the worktable, and its output shaft extends upward and is connected to a synchronous pulley one. A synchronous pulley two is installed in the middle of the rotating shaft. The synchronous pulley one and the synchronous pulley two are connected by a synchronous belt drive. Multiple limiting mechanisms are arranged around the positioning mechanism. Each limiting mechanism includes a dual-axis cylinder and two limiting wheels. The dual-axis cylinder is mounted on the upper side of the worktable via a fixed frame. The piston rod extends inward and is connected to a moving plate. A C-shaped mounting frame is fixed on the moving plate. A threaded rod is rotatably connected to the center of the mounting frame. A hinge seat is threaded onto the threaded rod. A pair of hinge strips are hinged to the hinge seat. The two limiting wheels are respectively connected to the inner ends of the pair of hinge strips. The upper and lower sides of the limiting wheels are provided with wheel rims.

[0007] Preferably, the rotating shaft is hollow, with multiple chip suction grooves evenly distributed around its upper part in the circumferential direction. The positioning seat is provided with multiple chip suction holes. The chip suction grooves and chip suction holes are sealed and connected by a sealing cover. The lower end of the rotating shaft is connected to an external negative pressure suction device.

[0008] Preferably, the outer cover of the first synchronous pulley, the second synchronous pulley, and the synchronous belt is provided with a protective cover.

[0009] Preferably, the fixed frame is internally fixed with X-shaped reinforcing ribs.

[0010] Preferably, a compression spring is connected between the mounting frame and the hinge strip.

[0011] Compared with the prior art, the present invention has the following advantages: 1. High-precision automatic indexing: The rotating shaft is driven by a servo motor and synchronous belt, which achieves high-resolution and high-repeatability indexing of the flywheel circumferential holes, avoiding manual indexing errors and meeting the stringent requirements of dynamic balancing.

[0012] 2. Adaptive flexible clamping: The limiting mechanism clamps the outer circle of the flywheel from the top and bottom sides through a double limiting wheel + wheel flange structure. With the help of the hinge bar and compression spring, it can automatically adapt to flywheels of different diameters and the clamping force is uniform.

[0013] 3. High-efficiency integrated chip suction system: The hollow rotating shaft and the positioning seat have a connected chip suction channel. Combined with the external negative pressure equipment, it can realize the real-time suction of chips during drilling, avoid chip accumulation that affects accuracy or pollutes the environment, and improve the cleanliness of processing and the life of equipment.

[0014] In summary, our invention has achieved high precision, high adaptability, and high self-cleaning properties in the cast iron flywheel drilling process, demonstrating outstanding industrial application value. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a schematic diagram of the overall front view of this utility model.

[0017] Figure 3 This is a top view of the overall structure of this utility model.

[0018] Figure 4 This is a three-dimensional structural diagram of the positioning mechanism.

[0019] Figure 5 This is a schematic diagram of a partial explosion of the positioning mechanism.

[0020] Figure 6 This is a three-dimensional structural diagram of the limiting mechanism.

[0021] Figure 7 This is a schematic diagram of the structure of a cast iron flywheel after being partially cut in half.

[0022] in: 10-Workbench; 20-Positioning mechanism; 201-Bearing housing; 202-Rotating shaft; 202a-Chip suction groove; 203-Positioning seat; 203a-Chip suction hole; 204-Sealing cover; 205-Servo motor; 206-Synchronous pulley one; 207-Synchronous pulley two; 208-Synchronous belt; 209-Protective cover; 30-Limiting mechanism; 301-Fixing frame; 302-Reinforcing rib; 303-Dual-axis cylinder; 304-Moving plate; 305-Mounting frame; 306-Threaded rod; 307-Hinge seat; 308-Hinge strip; 309-Limiting wheel; 310-Compression spring; 40 - Cast iron flywheel; 40a - Assembly slot; 40b - Assembly hole. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] like Figures 1 to 7 As shown, a drilling mechanism for machining cast iron flywheels includes: Workbench 10; The positioning mechanism 20, located on the upper side of the worktable 10, includes a bearing seat 201, a rotating shaft 202, a positioning seat 203, and a servo motor 205. The rotating shaft 202 is rotatably connected to the center of the worktable 10 via the bearing seat 201. The positioning seat 203 is coaxially connected to the top of the rotating shaft 202. The servo motor 205 is mounted on the lower side of the worktable 10, with its output shaft extending upward and connected to a first synchronous pulley 206. A second synchronous pulley 207 is mounted in the middle of the rotating shaft 202. The first synchronous pulley 206 and the second synchronous pulley 207 are connected by a synchronous belt 208. The positioning mechanism 20 precisely controls the angle of the rotating shaft 202 through the servo motor 205, realizing automatic indexing and positioning of multiple holes in the flywheel circumferential direction, improving drilling position accuracy and processing efficiency. The synchronous belt drive has a compact structure, low noise, and requires no maintenance, making it suitable for cleanroom environments. Multiple limiting mechanisms 30 are arranged around the positioning mechanism 20. Each limiting mechanism 30 includes a dual-axis cylinder 303 and two limiting wheels 309. The dual-axis cylinder 303 is mounted on the upper side of the worktable 10 via a fixing frame 301. The piston rod of the cylinder extends inward and is connected to a moving plate 304. A C-shaped mounting frame 305 is fixed on the moving plate 304. A threaded rod 306 is rotatably connected to the center of the mounting frame 305. A threaded rod 306 is threaded onto the threaded rod 306. The flywheel is fitted with a hinge seat 307, on which a pair of hinge bars 308 are hinged. Two limiting wheels 309 are respectively connected to the inner ends of the pair of hinge bars 308. The limiting wheels 309 are provided with wheel flanges on both the upper and lower sides. The limiting mechanism 30 adopts a double wheel clamping structure, which clamps the outer edge of the flywheel from the upper and lower sides through the wheel flanges to prevent the flywheel from axially moving or radially shifting during drilling. The hinge bars 308 and the threaded rod 306 can cooperate to adapt to the clamping requirements of flywheels of different diameters.

[0025] In this embodiment, the rotating shaft 202 is hollow, with multiple chip-collecting grooves 202a evenly distributed circumferentially on its upper part. The positioning seat 203 has correspondingly multiple chip-collecting holes 203a. The chip-collecting grooves 202a and the chip-collecting holes 203a are sealed and connected by a sealing cover 204. The lower end of the rotating shaft 202 is connected to an external negative pressure suction device. The hollow rotating shaft 202 integrates a chip-collecting channel, which can suction cast iron chips generated during drilling in real time, preventing chip accumulation from affecting positioning accuracy or scratching the workpiece surface. The sealing cover 204 ensures effective negative pressure transmission, improves chip-collecting efficiency, improves the working environment, and extends equipment life.

[0026] In this embodiment, the outer covers of the first synchronous pulley 206, the second synchronous pulley 207, and the synchronous belt 208 are equipped with protective covers 209. The protective covers 209 effectively isolate the transmission components, preventing operators from contacting the moving parts and causing safety accidents. At the same time, they block chips and dust from entering the synchronous belt area, avoiding transmission slippage or wear, and ensuring long-term operational reliability.

[0027] In this embodiment, an X-shaped reinforcing rib 302 is fixedly connected inside the fixed frame 301. The reinforcing rib 302 significantly improves the torsional and bending stiffness of the fixed frame 301, prevents the frame from deforming due to repeated operation of the dual-axis cylinder 303, ensures the consistency of the position of the limit wheel 309, and thus guarantees the repeatability and positioning accuracy of the cast iron flywheel 40.

[0028] In this embodiment, a compression spring 310 is connected between the mounting frame 305 and the hinge bar 308. The preload of the compression spring 310 ensures that the hinge bar 308 always abuts against the corresponding end of the mounting frame 305. Thus, when the hinge seat 307 is adjusted by rotating the threaded rod 306, the synchronous change in the distance between the two limiting wheels 309 can be observed intuitively and stably, facilitating quick adaptation to flywheels of different diameters and ensuring clamping alignment.

[0029] In this embodiment, a cylindrical assembly groove 40a is pre-cut at the middle position of the cast iron flywheel 40. Then, the cast iron flywheel 40 is positioned and limited by this application. Finally, multiple assembly holes 40b are continuously drilled at the bottom of the assembly groove 40b by a drill bit fitted with a drilling dust cover.

[0030] Working principle of a drilling mechanism for machining cast iron flywheels: First, the cast iron flywheel to be processed is placed on the positioning seat 203, and its inner hole or reference surface is initially aligned with the positioning seat. Subsequently, multiple surrounding limiting mechanisms 30 operate synchronously: the dual-axis cylinder 303 drives the piston rod to retract inward, which moves the moving plate 304 and the C-shaped mounting frame 305 closer to the outer edge of the flywheel, so that the two rimmed limiting wheels 309 flexibly clamp the outer circle of the flywheel from the upper and lower sides, forming a stable and deformation-free constraint at more than three points, effectively preventing axial movement and radial offset.

[0031] Next, the servo motor 205 starts, precisely driving the rotating shaft 202 to rotate to a preset angle via a synchronous belt transmission system consisting of synchronous pulley 206, synchronous belt 209, and synchronous pulley 207, aligning the first hole to be drilled on the flywheel with the drill bit above. During drilling, the external negative pressure suction device is activated simultaneously, and cast iron chips enter the chip suction groove 202a inside the rotating shaft 202 through the chip suction hole 203a on the positioning seat 203 and the sealing cover 204, and are finally discharged through the hollow channel, achieving "drilling and suction simultaneously" and keeping the processing area clean.

[0032] After completing one hole, the servo motor 205 automatically indexes to the next hole position according to the program instructions, repeating the drilling and chip removal process until all holes are machined. Throughout the process, the protective cover 209 completely encloses the transmission components to ensure operational safety; the X-shaped reinforcing rib 302 ensures that the fixing frame 301 does not deform under high-frequency reciprocating loads, maintaining clamping accuracy. After machining is completed, the dual-axis cylinder 303 retracts, the limit wheel 309 is released, and the finished flywheel can be removed, achieving quick changeover.

[0033] Therefore, the above-disclosed embodiments are merely illustrative in all respects and are not the only ones. All modifications within the scope of this utility model or its equivalents are included in this utility model.

Claims

1. A drilling mechanism for machining cast iron flywheels, characterized in that: include: Workbench (10); The positioning mechanism (20) is located on the upper side of the worktable (10) and includes a bearing seat (201), a rotating shaft (202), a positioning seat (203) and a servo motor (205). The rotating shaft (202) is rotatably connected to the center of the worktable (10) through the bearing seat (201). The positioning seat (203) is coaxially connected to the top of the rotating shaft (202). The servo motor (205) is installed on the lower side of the worktable (10), and its output shaft extends upward and is connected to a synchronous pulley (206). A synchronous pulley (207) is installed in the middle of the rotating shaft (202). The synchronous pulley (206) and the synchronous pulley (207) are connected by a synchronous belt (208). Multiple limiting mechanisms (30) are arranged around the positioning mechanism (20). Each limiting mechanism (30) includes a dual-axis cylinder (303) and two limiting wheels (309). The dual-axis cylinder (303) is installed on the upper side of the workbench (10) through a fixed frame (301). The piston rod of the cylinder extends inward and is connected to a moving plate (304). A C-shaped mounting frame (305) is fixed on the moving plate (304). A threaded rod (306) is rotatably connected to the center of the mounting frame (305). A hinge seat (307) is threaded on the threaded rod (306). A pair of hinge bars (308) are hinged on the hinge seat (307). The two limiting wheels (309) are respectively connected to the inner ends of the pair of hinge bars (308). The upper and lower sides of the limiting wheel (309) are provided with wheel flanges.

2. The drilling mechanism for machining a cast iron flywheel according to claim 1, characterized in that: The rotating shaft (202) is hollow, and multiple chip suction grooves (202a) are evenly provided on its upper part along the circumference. The positioning seat (203) is provided with multiple chip suction holes (203a). The chip suction grooves (202a) and the chip suction holes (203a) are sealed and connected by a sealing cover (204). The lower end of the rotating shaft (202) is connected to an external negative pressure suction device.

3. The drilling mechanism for machining a cast iron flywheel according to claim 1, characterized in that: The outer covers of the first synchronous pulley (206), the second synchronous pulley (207), and the synchronous belt (208) are provided with protective covers (209).

4. The drilling mechanism for machining a cast iron flywheel according to claim 1, characterized in that: The fixed frame (301) is internally fixedly connected with an X-shaped reinforcing rib (302).

5. The drilling mechanism for machining a cast iron flywheel according to claim 1, characterized in that: A compression spring (310) is connected between the mounting frame (305) and the hinge strip (308).

Images