A telescopic tailstock device for undulating piston spinning

Abstract

The utility model discloses a kind of telescopic tail head devices for fluctuation piston spinning processing, including tail head body, tail head body inside is equipped with axial containing cavity, front end is equipped with fixed disc, containing cavity inside is slidably connected with ejector rod, bottom and the tail end between ejector rod are equipped with elastic member, fixed disc is evenly distributed and can be radially slidably connected with multiple pawls inside multiple pawls, multiple pawls are slidably connected with top seat, top seat side is set as inclined plane, cross-sectional area gradually reduces along the direction of approaching fixed disc, sliding link that passes through fixed disc is connected between the rear end of top seat and ejector rod, when top seat is subjected to axial thrust, multiple pawls are pushed open radially outward along its conical surface by moving backwards, so that the outside working surface of pawl is braced in blank workpiece inner wall, simultaneously push link drives ejector rod to compress elastic member. In this way, reduce processing procedure, reduce working hour cost;Increase material utilization, reduce raw material cost;Reduce defect rate, improve product quality;Simple structure, strong adaptability.

Description

Technical Field

[0001] This utility model relates to the field of undulating piston processing technology, and in particular to a telescopic tail tip device for spinning undulating pistons. Background Technology

[0002] The undulating piston is a key component commonly used in the field of mechanical transmission. It needs to be formed by spinning during its processing, and the stability of spinning depends on the precise positioning and firm fixation of the blank.

[0003] Currently, the industry mainly adopts two tail-top fixing methods for spinning of undulating pistons: (1) Tail-top clamping type: The tail-top device directly clamps the tail of the undulating piston blank. In order to ensure clamping stability, two additional processing steps, "CNC length fixing" and "turning the outer circle", are required to ensure that the tail end face is flat and the outer diameter is uniform, resulting in complicated processing and increased labor costs; (2) Head-sealing type: The head of the undulating piston blank is designed as a sealed solid structure, and the tail-top directly clamps the head solid part. Although this method saves the tail processing, the head sealing solid needs to be removed by subsequent cutting. The cutting amount accounts for 15%-20% of the total weight of the blank, the raw material utilization rate is extremely low, and the extra cutting steps further increase the processing cost.

[0004] Both of the above methods have obvious drawbacks: on the one hand, there are many processing steps (at least 2-3 additional steps), and the number of manual clamping operations is frequent, which can easily lead to defects such as scratches and dimensional deviations due to clamping errors, resulting in a high defect rate; on the other hand, the waste of raw materials or the increase in process costs increases the overall processing cost of the fluctuating piston.

[0005] Therefore, there is an urgent need for a tail-end device that can simplify blank preparation, reduce processing steps, improve material utilization, and ensure processing quality. Utility Model Content

[0006] To address the technical problems existing in the background art, this utility model proposes a telescopic tail top device for undulating piston spinning processing.

[0007] This utility model proposes a telescopic tail-end device for undulating piston spinning, comprising a tail-end body, an axially accommodating cavity inside the tail-end body, a fixed plate fixed at the front end, a push rod slidably connected inside the accommodating cavity, and an elastic element installed between the bottom and the tail end of the push rod. Multiple push claws are evenly distributed circumferentially and slidably connected radially to the fixed plate. A top seat is slidably connected to the inner side of each push claw. The side of the top seat is an inclined surface with a gradually decreasing cross-sectional area near the fixed plate. A connecting rod slidably penetrates the fixed plate between the rear end of the top seat and the push rod. When the top seat is subjected to axial thrust, it moves backward and radially pushes the multiple push claws outward along its conical surface, so that the outer working surface of the push claws is pressed against the inner wall of the workpiece blank, while simultaneously pushing the connecting rod to compress the elastic element.

[0008] Preferably, the top seat is configured as a frustum-shaped or trapezoidal structure.

[0009] Preferably, the number of the top claws is three or four, which together form a hollow cylinder.

[0010] Preferably, the elastic element is a helical spring or a disc spring.

[0011] Preferably, the rear end of the tail top body is connected to the tail top drive shaft of the spinning machine via a threaded or flanged structure.

[0012] Preferably, the connecting rod has at least three links, and the two ends of the connecting rod are respectively hinged to the front end of the top rod and the top seat to form a multi-link transmission structure.

[0013] In summary, this utility model has the following beneficial effects: It directly tightens the inner hole of the undulating piston blank through the telescopic tail-end device, eliminating the two processes of "fixed length" and "outer circle turning" required for tail-end tightening in the original process, significantly shortening the process flow, improving production efficiency, and reducing processing costs; simultaneously, it eliminates the need to reserve a solid boss for pressing, allowing for a corresponding reduction in blank length, reducing raw material consumption, improving material utilization, and further lowering costs; it avoids positioning errors and clamping risks caused by multiple clamping operations, effectively reducing defects such as surface scratches and dimensional deviations caused by improper manual operation, resulting in higher product consistency and yield; employing the principle of conical expansion and an elastic element reset structure, it features a compact structure, sensitive operation, and uniform and stable clamping force, reliably ensuring that the workpiece does not slip or shift during high-speed spinning.

[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] Figure 1 This is a cross-sectional view of the top seat of the telescopic tail device in an embodiment of the present invention in an unloaded state;

[0016] Figure 2 This is a perspective view of the top seat of the telescopic tail device in an embodiment of the present invention in an unloaded state.

[0017] Figure 3 This is a cross-sectional view of the telescopic tail top device of this utility model when the top seat is under force and the top claw is open.

[0018] Figure 4 This is a perspective view of the telescopic tail top device of this utility model when the top seat is under force and the top claw is open.

[0019] Figure 5 This is a cross-sectional view of the telescopic tail tip device of this utility model embodiment, showing it extending into the inner hole of the blank.

[0020] In the picture:

[0021] 1. Tail top body; 11. Receiving cavity; 111. Elastic element; 2. Fixed plate; 3. Push rod; 4. Push claw; 41. T-shaped slider; 5. Top seat; 51. T-shaped slide groove; 6. Connecting rod; 7. Blank workpiece; 8. Spinning machine chuck. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0023] like Figure 1-5 As shown in the figure, the telescopic tail top device for undulating piston spinning proposed in this embodiment includes a tail top body 1. The tail top body 1 has an axial accommodating cavity 11 inside and a fixed plate 2 fixed at the front end. A push rod 3 is slidably connected inside the accommodating cavity 11. An elastic element 111 is installed between the bottom and the tail end of the push rod 3. The fixed plate 2 is evenly distributed circumferentially and radially slidably connected with multiple push claws 4. A top seat 5 is slidably connected to the inner side of the multiple push claws 4. The side of the top seat 5 is set as an inclined surface, and the cross-sectional area gradually decreases along the direction close to the fixed plate 2. A connecting rod 6 that slides through the fixed plate 2 is connected between the rear end of the top seat 5 and the push rod 3. When the top seat 5 is subjected to axial thrust, it moves backward and radially pushes the multiple push claws 4 outward along its conical surface so that the outer working surface of the push claws 4 is tightly supported against the inner wall of the blank workpiece 7. At the same time, the connecting rod 6 is pushed to drive the push rod 3 to compress the elastic element 111.

[0024] Specifically, the elastic element 111 is a helical spring or a disc spring, used to drive the push rod 3 to reset.

[0025] In this way, the inner hole of the undulating piston blank workpiece 7 is directly tightened by the telescopic tail top device, eliminating the two processes of "fixed length" and "outer circle turning" required for tail top tightening in the original process. This significantly shortens the process flow, improves production efficiency, and reduces processing costs. At the same time, there is no need to reserve a solid boss for top pressing, and the blank length can be shortened accordingly, reducing raw material consumption, improving material utilization, and further reducing costs. It avoids positioning errors and clamping risks caused by multiple clamping, effectively reducing defects such as appearance scratches and dimensional deviations caused by improper manual operation, resulting in higher product consistency and yield. By adopting the principle of conical expansion and elastic element reset structure, the structure is compact, the action is sensitive, and the clamping force is uniform and stable, which can reliably ensure that the workpiece does not slip or shift during high-speed spinning.

[0026] Furthermore, the top seat 5 is configured as a frustum or trapezoidal structure with a conical surface, and each top claw 4 has an inclined surface that mates with the conical surface of the top seat 5. When the top rod 3 drives the top seat 5 to move axially, the engagement of the conical surface and the inclined surface drives each top claw 4 to move radially. Specifically, the conical surface of the top seat 5 is provided with a T-shaped groove 51, and the inner inclined surface of the top claw 4 is provided with a T-shaped slider 41, which is embedded in the T-shaped groove 51.

[0027] Furthermore, the number of top claws 4 is three or four, which together form a hollow cylinder. Specifically, each of the four top claws 4 has a slider (not shown in the figure) on its inner side, and the fixed plate 2 has a groove. The slider is embedded in the groove and can slide radially. When the four top claws 4 are closed, they can form a complete outer cylindrical surface.

[0028] The system includes at least three connecting rods 6, with both ends of each rod hinged to the front end of the push rod 3 and the top seat 5, respectively, forming a multi-link transmission structure. Specifically, there are four connecting rods 6, made of stainless steel, with a length of 30-35mm and a diameter of 5-6mm. One end of each connecting rod 6 is connected to the front end of the push rod 3 via a hinge, and the other end is connected to the top seat 5 via a hinge, forming a four-link transmission structure. The axial movement of the push rod 3 is converted into the axial movement of the top seat 5 through the connecting rods 6.

[0029] In this embodiment, the rear end of the tail-top body 1 is connected to the tail-top drive shaft of the spinning machine via a threaded or flanged structure. The spinning machine chuck 8 adopts a three-jaw chuck structure and is installed on the spindle end of the spinning machine to hold the front end of the undulating piston blank. The clamping surface of the spinning machine chuck 8 is machined with soft claws (made of copper) to prevent scratching the surface of the blank during the spinning machine clamping process. The central axis of the spinning machine chuck 8 coincides with the central axis of the telescopic tail-top assembly to ensure accurate axial positioning of the blank (coaxiality error ≤ 0.02 mm).

[0030] Working principle: During operation, the entire telescopic tail jack device is installed on the tail jack drive shaft of the spinning machine. The blank workpiece 7 is placed on the outside of the jack 4. The drive shaft pushes the entire tail jack device forward until the head of the blank workpiece 7 contacts the spinning machine chuck 8. As the telescopic tail jack device continues to move forward, the top seat 5 first contacts the spinning machine chuck 8 and receives a reverse axial thrust. This thrust forces the top seat 5 to move backward. On the one hand, the connecting rod 6 pushes the top rod 3 to compress the spring backward. On the other hand, the conical surface of the top seat 5 slides relative to the inclined surface on the inner side of the jack 4, thereby decomposing the radial force to each jack 4, forcing them to expand outward along the radial T-shaped groove 51 of the fixed plate 2, and finally firmly supporting them on the inner wall of the blank workpiece 7. At this time, the spinning machine spindle rotates, which drives the workpiece to rotate through the spinning machine chuck 8. The tail jack drive shaft provides a continuous clamping force, and spinning can then begin. After processing, the tail drive shaft retracts, the pressure on the top seat 5 disappears, and under the action of the spring restoring force, the push rod 3 returns to its original position, and the top seat 5 is pulled back through the connecting rod 6. The push claw 4 loses its radial support force and contracts radially under its own weight, disengaging from the inner wall of the workpiece, so that the workpiece can be easily removed.

[0031] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 this utility model.

[0032] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A telescopic tailstock device for undulating piston spinning, comprising a tailstock body, characterized in that, The tailstock body has an axial accommodating cavity inside and a fixed plate fixed at the front end. A push rod is slidably connected inside the accommodating cavity, and an elastic element is installed between the bottom and the tail end of the push rod. Multiple push claws are evenly distributed circumferentially and slidably connected radially to the fixed plate. A top seat is slidably connected to the inner side of the multiple push claws. The side of the top seat is set as an inclined surface, and the cross-sectional area gradually decreases along the direction close to the fixed plate. A connecting rod that slides through the fixed plate is connected between the rear end of the top seat and the push rod. When the top seat is subjected to axial thrust, it moves backward and pushes the multiple push claws radially outward along its conical surface so that the outer working surface of the push claws is pressed against the inner wall of the blank workpiece. At the same time, the connecting rod is pushed to drive the push rod to compress the elastic element.

2. The telescopic tailstock device for undulating piston spinning according to claim 1, characterized in that, The top seat is designed as a frustum or trapezoidal structure.

3. The telescopic tailstock device for undulating piston spinning according to claim 1, characterized in that, The number of the top claws is three or four, which together form a hollow cylinder.

4. The telescopic tailstock device for undulating piston spinning according to claim 1, characterized in that, The elastic element is a helical spring or a disc spring.

5. The telescopic tailstock device for undulating piston spinning according to claim 1, characterized in that, The rear end of the tail top body is connected to the tail top drive shaft of the spinning machine via a threaded or flanged structure.

6. The telescopic tailpiece device for undulating piston spinning according to claim 1, characterized in that, The connecting rod has at least three links, and the two ends of the connecting rod are respectively hinged to the front end of the top rod and the top seat to form a multi-link transmission structure.

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