Inner star wheel hard turning and hard milling error proofing tool

Abstract

The utility model discloses a kind of inner star wheel hard milling mistake-proof tool, including lathe main body and feed table, the lower end of one end of lathe main body is fixedly connected with feed table, the upper side of one end of lathe main body close to feed table is provided with horizontal truss, the side below lathe main body is provided with feed port, the position corresponding with feed port on the upper side of feed table is slidably connected with feeding slide, the upper side of feeding slide is fixedly connected with general positioning mould, the side of feed table upper side away from general positioning mould is fixedly connected with spherical positioning structure.The utility model is set with spherical positioning structure for the ball groove structure of inner star wheel, through the positioning design of adaptation with part, cooperate the inner hole expansion clamp of expansion clamping from center hole, can better guarantee the repeat positioning accuracy of part clamping, reduce position deviation in processing process, improve processing consistency.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing feeding equipment technology, and in particular to an error-proof tooling for internal star wheel hard turning and hard milling. Background Technology

[0002] A ball-cage constant velocity joint (CV joint) is a universal coupling that uses several steel balls placed in inner and outer star wheel grooves connected to two shafts to achieve synchronous rotation of the two shafts. Its structure mainly consists of four parts: a bell-shaped housing, transmission steel balls, inner star wheels, and a ball-cage cage. The inner star wheel works with the transmission steel balls to achieve synchronous rotation. Working principle: The ball-cage CV joint achieves constant velocity transmission between the two shafts through the rolling of the steel balls in the inner and outer star wheel grooves. The steel balls are fixed in the window of the cage, and torque is transmitted through the rolling of the six steel balls, allowing the two shafts to rotate at the same angular velocity. Because it overcomes the non-uniform velocity problem of ordinary cross-shaft universal joints, it is particularly suitable for use in steering drive axles. The ball-cage CV joint is widely used in automotive transmission systems, especially in applications requiring high-speed rotation and high torque, such as when the front wheels are both drive wheels and steering wheels.

[0003] As a key component of the ball-cage constant velocity universal joint, the inner star wheel presents certain technical challenges in manufacturing and inspection due to its unique six spherical grooves. Early manufacturing processes employed external cylindrical grinding machines with mold transfer for sequential machining, resulting in low efficiency and precision dependence on tooling and molds, primarily suitable for low-requirement applications. Later manufacturing processes mainly utilized specialized grinding machines, significantly improving precision and surface quality, but with limited material removal efficiency and significant environmental impact due to the use of grinding oil in the production environment. Currently, a hard turning and hard milling composite machining method is employed, utilizing high-rigidity CNC equipment and superhard cutting tools to complete the machining of all six grooves and the outer surface in a single setup. This method is highly efficient, has minimal error, and allows for flexible parameter adjustments, making it suitable for high-volume, high-precision production.

[0004] To ensure equipment processing efficiency, a truss automated feeding fixture system was designed for automatic feeding and product angle positioning was achieved using a universal positioning mold. However, this fixture lacks an effective error prevention and identification mechanism, making it difficult to accurately distinguish between the front and back sides during feeding, increasing the risk of clamping errors. In the hard turning and hard milling of the internal star wheel, due to the special structure of the internal star wheel, the internal wheel groove cannot match the universal mold when clamped on the back side, which will lead to changes in the processing position. This can easily cause equipment collisions and workpiece scrapping during subsequent processing, restricting the automation and quality control of the production line. There is an urgent need to add identification methods to eliminate the risk of mis-loading. Utility Model Content

[0005] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art, and to provide an internal star wheel hard turning and hard milling error prevention tooling, thereby solving the above-mentioned problem.

[0006] To achieve the above objectives, an error-proof fixture for internal star wheel hard turning and hard milling is provided, comprising a machine tool body and a feeding table. The feeding table is fixedly connected to the lower end of one end of the machine tool body. A transverse truss is provided above the end of the machine tool body near the feeding table. An electric cylinder sliding seat is slidably connected to the transverse truss. A lifting cylinder is fixedly connected to the side of the electric cylinder sliding seat away from the machine tool body. A clamp lifting frame is fixedly connected to the bottom of the lifting cylinder. Limiting slide rods are slidably connected to both sides of the clamp lifting frame. An internal hole expansion clamp is slidably connected to the lower part of the clamp lifting frame through the two limiting slide rods. A magnetic induction switch is provided on the side above the clamp lifting frame of the lifting cylinder. A feeding port is provided on one side of the lower part of the machine tool body. A feeding slide is slidably connected above the feeding table at a position corresponding to the feeding port. A universal positioning mold is fixedly connected above the feeding slide. A spherical positioning structure is fixedly connected on the side of the feeding table away from the universal positioning mold.

[0007] According to the aforementioned anti-error tooling for hard turning and hard milling of an inner star wheel, the spherical positioning structure includes a fixed base, positioning columns, and positioning ball heads. The bottom of the fixed base is fixedly connected to the feed table, and positioning columns are fixedly connected to both sides of the upper part of the fixed base. Positioning ball heads are fixedly connected to the top of each of the two positioning columns. The distance between the two positioning columns corresponds to the distance between two spherical grooves at symmetrical positions of the inner star wheel, and the specifications of the positioning ball heads correspond to the specifications of the spherical grooves of the inner star wheel.

[0008] According to the aforementioned internal star wheel hard turning and hard milling error prevention tooling, the output end of the lifting cylinder passes through the clamp lifting frame and is fixedly connected to the internal hole expansion clamp.

[0009] According to the aforementioned internal star wheel hard turning and hard milling error prevention tooling, a discharge conveyor belt is provided at one end of the feed platform near the feeding slide, and a feed conveyor belt is provided at one end of the feed platform near the spherical positioning structure.

[0010] According to the aforementioned internal star wheel hard turning and hard milling error prevention tooling, a discharge clamp is provided at one end of the feeding slide near the machine tool body.

[0011] According to the aforementioned internal star wheel hard turning and hard milling error prevention tooling, an induction magnet is provided at the position corresponding to the magnetic induction switch on the top of the limiting slide rod.

[0012] The above solution has at least one of the following beneficial effects: 1. Compared with the prior art, this utility model has a spherical positioning structure for the ball groove structure of the inner star wheel. Through the positioning design adapted to the part, and with the inner hole expansion fixture that expands and clamps from the center hole, the repeatability of the positioning accuracy of the part clamping can be better guaranteed, the position deviation during the processing can be reduced, the processing consistency can be improved, and the practicality of the device can be enhanced.

[0013] 2. This utility model is equipped with a magnetic induction switch, which works in conjunction with the induction magnet on the limit slide rod. When the inner star wheel descends to the spherical positioning structure, if it is placed face up, it will precisely fit with the spherical positioning structure. The extension and retraction of the cylinder will cause the induction magnet to trigger the magnetic induction switch below the cylinder. The signal will be transmitted to the machine tool control system, allowing the processing to continue. If it is placed face down, the extension and retraction of the cylinder will not be complete, and it will not be able to contact the magnetic induction switch below, triggering the machine tool alarm and stopping operation. This achieves error prevention and enhances the practicality of the device.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a left-side three-dimensional structural diagram of an internal star wheel hard turning and hard milling error-proofing tooling according to the present invention; Figure 2 This is a three-dimensional structural diagram of the right side of the internal star wheel hard turning and hard milling error prevention tooling of this utility model; Figure 3 This is a front structural schematic diagram of an internal star wheel hard turning and hard milling error-proofing tooling according to the present invention; Figure 4 for Figure 2 Enlarged view of point A.

[0016] Legend: 1. Machine tool body; 2. Feeding table; 3. Feeding port; 4. Transverse truss; 5. Electric cylinder sliding seat; 6. Lifting cylinder; 7. Fixture lifting frame; 8. Feeding slide; 9. Spherical positioning structure; 10. Universal positioning mold; 11. Discharge conveyor belt; 12. Feed conveyor belt; 13. Magnetic induction switch; 14. Internal hole expansion fixture; 15. Limiting slide bar; 91. Fixed base; 92. Positioning column; 93. Positioning ball head. Detailed Implementation

[0017] This section will describe in detail the specific embodiments of the present utility model. Preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present utility model. The drawings are all in a very simplified form and use non-precise proportions. They are only used to help to explain the embodiments of the present utility model in a convenient and clear way, and should not be construed as limiting the scope of protection of the present utility model.

[0018] Reference Figure 1-4 This utility model provides an internal star wheel hard turning and hard milling error prevention tooling, including a machine tool body 1 and a feeding table 2. The feeding table 2 is fixedly connected to the lower end of one end of the machine tool body 1. A transverse truss 4 is provided above the end of the machine tool body 1 near the feeding table 2. An electric cylinder sliding seat 5 is slidably connected to the transverse truss 4. A lifting cylinder 6 is fixedly connected to the side of the electric cylinder sliding seat 5 away from the machine tool body 1. A clamp lifting frame 7 is fixedly connected to the bottom of the lifting cylinder 6. Limiting slide rods 15 are slidably connected to both sides of the lifting cylinder 6. An inner hole expansion clamp 14 is slidably connected to the lower part of the clamp lifting frame 7 through the two limiting slide rods 15. The output end of the lifting cylinder 6 passes through the clamp lifting frame 7 and is fixedly connected to the inner hole expansion clamp 14. A magnetic induction switch 13 is provided on one side above the clamp lifting frame 7 of the lifting cylinder 6, and an induction magnet is provided at the top of the limit slide bar 15 on the same side corresponding to the magnetic induction switch 13. The status of the workpiece can be detected by detecting whether the cylinder extension length is in place. A feeding port 3 is provided on one side of the lower part of the machine tool body 1. A feeding slide 8 is slidably connected above the feeding table 2 at a position corresponding to the feeding port 3. A universal positioning mold 10 is fixedly connected above the feeding slide 8. A discharge clamp is provided at the end of the feeding slide 8 near the machine tool body 1. A spherical positioning structure 9 is fixedly connected at the side of the feeding table 2 away from the universal positioning mold 10. A discharge conveyor belt 11 is provided at the end of the feeding table 2 near the feeding slide 8. A feeding conveyor belt 12 is provided at the end of the feeding table 2 near the spherical positioning structure 9. The inner hole expansion clamp 14 can be moved by the lifting cylinder 6 and the cylinder sliding seat 5. First, the inner star wheel of the discharge is picked up onto the discharge conveyor belt 11. Then, the workpiece to be processed is picked up from the feeding conveyor belt 12. After the workpiece is placed on the spherical positioning structure 9 for positioning and error prevention, it is then placed on the universal positioning mold 10. The spherical positioning structure 9 includes a fixed base 91, positioning posts 92, and positioning ball heads 93. The bottom of the fixed base 91 is fixedly connected to the feeding table 2. Positioning posts 92 are fixedly connected to both sides of the upper part of the fixed base 91. Positioning ball heads 93 are fixedly connected to the top of the two positioning posts 92. The distance between the two positioning posts 92 corresponds to the distance between the two ball grooves at the symmetrical position of the inner star wheel. The specifications of the positioning ball heads 93 correspond to the specifications of the ball grooves of the inner star wheel. By using spherical protrusions of specific size and curvature, they are adapted to the corresponding clamping parts of the inner star wheel.

[0019] Working Principle: During operation, this invention utilizes a spherical positioning structure 9 with a specific size and curvature spherical protrusion that mates with the corresponding clamping part of the inner star wheel. A magnetic induction switch 13, connected to the machine tool control system via an induction lamp, identifies the clamping status. During clamping, the operator uses an electric cylinder sliding block to move the inner star wheel closer to the spherical positioning structure 9. The spherical positioning structure 9 pre-positions the inner star wheel. If the inner star wheel is placed face-up, it precisely matches the spherical positioning structure 9. The cylinder's extension and retraction length triggers the magnetic induction switch 13 below the cylinder, illuminating the induction lamp and transmitting a signal to the machine tool control system, allowing the machining process to continue. If the inner star wheel is placed face-down, the spherical positioning structure 9 cannot properly engage, the cylinder's extension and retraction length is insufficient to contact the magnetic induction switch 13 below, the induction lamp does not illuminate, and the control system, upon receiving the signal, triggers a machine tool alarm and stops operation, thus preventing errors.

[0020] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A hard turning and hard milling mistake-proofing tool for internal star wheels, comprising a machine tool body (1) and a feed table (2), characterized in that: A feeding table (2) is fixedly connected to one end of the machine tool body (1). A transverse truss (4) is provided above the end of the machine tool body (1) near the feeding table (2). An electric cylinder sliding seat (5) is slidably connected to the transverse truss (4). A lifting cylinder (6) is fixedly connected to the side of the electric cylinder sliding seat (5) away from the machine tool body (1). A clamp lifting frame (7) is fixedly connected to the bottom of the lifting cylinder (6). Limiting slide rods (15) are slidably connected to both sides of the lifting cylinder (6). An inner hole expansion clamp (14) is slidably connected to the bottom of the clamp lifting frame (7) through the two limiting slide rods (15). A magnetic induction switch (13) is provided on the side above the clamp lifting frame (7) of the lifting cylinder (6). A feeding port (3) is provided on one side below the machine tool body (1). A feeding slide (8) is slidably connected above the feeding table (2) at a position corresponding to the feeding port (3). A universal positioning mold (10) is fixedly connected above the feeding slide (8). A spherical positioning structure (9) is fixedly connected on the side of the feeding table (2) away from the universal positioning mold (10).

2. The inner star wheel hard turning and hard milling mistake proofing tooling according to claim 1, wherein, The spherical positioning structure (9) includes a fixed base (91), positioning columns (92) and positioning ball heads (93). The bottom of the fixed base (91) is fixedly connected to the feeding platform (2). Positioning columns (92) are fixedly connected to both sides of the upper part of the fixed base (91). Positioning ball heads (93) are fixedly connected to the top of the two positioning columns (92). The distance between the two positioning columns (92) corresponds to the distance between the two ball grooves at the symmetrical position of the inner star wheel. The specifications of the positioning ball heads (93) correspond to the specifications of the ball grooves of the inner star wheel.

3. The inner star wheel hard turning and hard milling mistake proofing tooling of claim 1, wherein, The output end of the lifting cylinder (6) passes through the clamp lifting frame (7) and is fixedly connected to the inner hole expansion clamp (14).

4. The inner star wheel hard turning and hard milling mistake proofing tooling of claim 1, wherein, A discharge conveyor belt (11) is provided at one end of the feed platform (2) near the feeding slide (8), and a feed conveyor belt (12) is provided at one end of the feed platform (2) near the spherical positioning structure (9).

5. The inner star wheel hard turning and hard milling mistake proofing tooling of claim 1, wherein, A discharge clamp is provided at one end of the feeding slide (8) near the machine tool body (1).

6. The inner star wheel hard set hard mill mistake proofing fixture of claim 1, wherein, A sensing magnet is provided at the top of the limiting slide bar (15) at a position corresponding to the magnetic induction switch (13).

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