Shaft workpiece fixing top piece

Abstract

The utility model relates to the technical field of shaft processing, and the utility model provides a kind of shaft workpiece fixed top piece.The utility model is provided with the shaft to be processed on the inside of the jacking post, and the stress lining assembly is arranged in the inside of the shaft to be processed;The adjusting fixed assembly includes the thimble, the jacking rod is contacted between the shaft to be processed, the positioning precision is insufficient in the prior art, the contact area of thimble and workpiece is small, and the axis is easily deviated due to the deviation of the clamping force or the flatness of workpiece end face, especially prone to radial runout during high-speed machining;The stress rationality is poor, the concentrated clamping force of thimble directly acts on the end face of workpiece, easily causes local stress concentration, causes the end face of workpiece to be concave or internal organization damage, more obvious for thin-walled shaft workpiece;Limited adaptability, traditional thimble structure is fixed, cannot be flexibly adjusted according to different inner diameter, length of shaft workpiece, need to frequently change tooling, reduce the production efficiency technical problem.

Description

Technical Field

[0001] This utility model relates to the field of shaft processing technology, specifically to a fixing top part for shaft workpieces. Background Technology

[0002] Currently, the mainstream methods for fixing shaft workpieces in the market are mainly divided into two categories: chuck clamping and ejector pin clamping. Although chuck clamping can provide strong clamping force, for shaft workpieces with a large length-to-diameter ratio, uneven distribution of clamping force can easily lead to radial deformation of the workpiece. In addition, the chuck structure itself can obstruct part of the machining area, limiting the machining range. Traditional ejector pin clamping methods mostly use single-end or double-end rigid ejector pins to directly clamp the end face of the workpiece. Although this can avoid the problem of obstruction of the machining area, it has obvious technical shortcomings: insufficient positioning accuracy, small contact area between the ejector pin and the workpiece, easy to cause axial displacement due to clamping force deviation or workpiece end face flatness issues, especially radial runout during high-speed machining; poor force distribution, the concentrated clamping force of the ejector pin acts directly on the end face of the workpiece, which can easily cause local stress concentration, leading to end face concavity or internal structural damage, which is more obvious for thin-walled shaft workpieces; limited adaptability, the traditional ejector pin structure is fixed and cannot be flexibly adjusted according to shaft workpieces with different inner diameters and lengths, requiring frequent tooling changes and reducing production efficiency. Utility Model Content

[0003] To overcome the above-mentioned defects, the embodiments of this utility model solve the problems of insufficient positioning accuracy, small contact area between the ejector pin and the workpiece, easy axial offset due to deviation of clamping force or flatness of workpiece end face, especially radial runout during high-speed machining; poor force rationality, the concentrated clamping force of the ejector pin acts directly on the end face of the workpiece, which can easily cause local stress concentration, resulting in concavity of the end face of the workpiece or damage to the internal structure, which is more obvious for thin-walled shaft workpieces; limited adaptability, the traditional ejector pin structure is fixed and cannot be flexibly adjusted according to shaft workpieces with different inner diameters and lengths, requiring frequent tooling changes and reducing production efficiency.

[0004] According to one aspect, at least one embodiment of the present invention provides a fixing top member for shaft-type workpieces, including... A top column, the inner side of which is provided with a shaft to be processed; An adjusting and fixing component is disposed on the top column; A load-bearing liner assembly is disposed inside the shaft to be processed; The adjusting and fixing assembly includes a push pin and two push columns. The push pin is disposed on the push column on the right side. The shaft to be processed has a communicating force-receiving cavity inside. A part of the push pin is embedded in the communicating force-receiving cavity. A positioning plate is disposed on the push column on the left side. The positioning plate has a positioning cavity inside. A push rod is disposed inside the positioning cavity. The push rod is in contact with the shaft to be processed.

[0005] For example, in the adjustment and fixing assembly provided in at least one embodiment of the present invention, a threaded post is provided inside the positioning cavity, a threaded cavity is provided inside the push rod, the threaded post is screwed onto the threaded cavity, an insertion groove is provided on the positioning plate, and the push rod is inserted into the insertion groove.

[0006] According to another aspect, at least one embodiment of the present invention also provides a force-bearing inner liner assembly, including an insertion cavity, the insertion cavity being opened inside the shaft to be processed, the inner sidewall of the insertion cavity being provided with an internal tooth cavity, a positioning block being inserted inside the internal tooth cavity, one end of the positioning block being provided with a limiting plate, the limiting plate being in contact with the push rod.

[0007] For example, in at least one embodiment of the present invention, the positioning block is seamlessly connected to the internal tooth cavity, and the limiting disc is attached to the side wall of the shaft to be processed.

[0008] As a further technical solution, a connecting plate is connected to the top post located on the right side, and the side wall of the connecting plate is fixedly connected to the top pin.

[0009] As a further technical solution, a top plate is provided on the top column located on the left side, and the top plate is fixedly connected to the positioning plate.

[0010] As a further technical solution, the two top pillars are located at opposite ends of the shaft to be processed, and the connecting force-bearing cavity and the positioning cavity are located at opposite ends of the shaft to be processed.

[0011] The beneficial effects of this utility model are as follows: In this invention, the positioning accuracy is significantly improved, ensuring processing quality. Compared with the positioning deviation caused by the small contact area between the traditional ejector pin and the workpiece, the ejector pin with a conical structure on the right side of this ejector is inserted into the connecting force cavity of the shaft to be processed. Through the self-positioning characteristics of the conical surface, it can automatically correct the radial offset of the workpiece. Combined with the high coaxiality assembly design of the left ejector pin-positioning plate-ejector rod and the right ejector pin-connecting plate-ejector pin, the precise centering of the shaft to be processed is achieved. At the same time, the left ejector rod is tightly fitted with the limiting plate through thread adjustment, forming an axial positioning constraint, which effectively avoids the axial offset caused by the deviation of the clamping force or the flatness of the workpiece end face in the traditional clamping method. During high-speed processing, the radial runout can be controlled within a smaller range. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this utility model and these drawings without any creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of a shaft-type workpiece fixing top member in one embodiment of the present invention; Figure 2 for Figure 1 Exploded view of the embodiment; Figure 3 for Figure 1 A sectional view; In the diagram: 1. Top post; 2. Shaft to be processed; 3. Adjustment and fixing assembly; 3-1. Top pin; 3-2. Connecting force-bearing cavity; 3-3. Positioning plate; 3-4. Positioning cavity; 3-5. Top rod; 3-6. Threaded post; 3-7. Threaded cavity; 3-8. Insertion groove; 4. Force-bearing inner liner assembly; 4-1. Insertion cavity; 4-2. Internal gear cavity; 4-3. Positioning block; 4-4. Limiting plate; 5. Connecting plate; 6. Top plate. Detailed Implementation The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit its scope.

[0014] To keep the drawings concise, only the parts relevant to the utility model are shown schematically in each drawing; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of the components with the same structure or function is schematically shown, or only one is labeled. In this document, "a" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0015] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0016] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0017] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0019] like Figures 1-3 As shown, it illustrates a shaft-type workpiece fixing top member according to an embodiment of the present invention, including... Top column 1, with a shaft 2 to be processed provided on the inner side of top column 1; Adjust the fixing component 3, which is set on the top column 1; Force-bearing inner liner assembly 4 is disposed inside the shaft 2 to be processed; The adjusting and fixing assembly 3 includes a ejector pin 3-1 and two ejector columns 1. The ejector pin 3-1 is set on the ejector column 1 on the right side. The shaft to be processed 2 has a connecting force-receiving cavity 3-2 inside. A part of the ejector pin 3-1 is embedded in the connecting force-receiving cavity 3-2. A positioning plate 3-3 is set on the ejector column 1 on the left side. The positioning plate 3-3 has a positioning cavity 3-4 inside. The positioning cavity 3-4 has a ejector rod 3-5 inside. The ejector rod 3-5 is in contact with the shaft to be processed 2.

[0020] In some examples, the core logic of the fixing top component for this type of shaft workpiece is to achieve precise positioning, stable clamping, and balanced bearing of the machining load of the shaft 2 to be processed by adjusting the bidirectional coordination, rigid constraint, and force transmission matching of the fixing component 3 and the force-bearing inner liner component 4. The coordination relationship of each component revolves around four core links: positioning, clamping, force distribution, and stable holding. The overall coordination takes the shaft 2 to be processed as the central bearing body. The left adjusting fixing component 3 provides adjustable rigid clamping force, the right adjusting fixing component 3 provides positioning guidance and auxiliary clamping force, and the force-bearing inner liner component 4 serves as the internal force transmission and distribution medium. The three form a closed-loop coordination of external constraint and internal support, ultimately achieving a fixed effect of no movement, no deformation, and high coaxiality of the shaft 2 to be processed.

[0021] The load-bearing inner liner assembly 4 acts as a bridge between the force of the push rod 3-5 and the inner wall of the shaft 2 to be processed. Together with the adjusting and fixing assembly 3, it forms a rigid transmission and load dispersion synergy. In terms of precise force transmission and load dispersion, if the cutting force and centrifugal force during processing are directly applied to the end face of the shaft 2 to be processed, it is easy to cause stress concentration. The load-bearing inner liner assembly 4, through the large-area contact of the limiting plate 4-4 with the inner wall of the left end of the shaft 2 to be processed, and the meshing of the positioning block 4-3 with the tooth profile of the internal tooth cavity 4-2, disperses the concentrated clamping force into surface load and tooth surface load. At the same time, the external load is dispersed to the push rod 3-5 through the internal tooth cavity 4-2, the positioning block 4-3, and the limiting plate 4-4, to avoid deformation of the shaft 2 to be processed. In terms of radial constraint, the tooth profile of the positioning block 4-3 and the internal tooth cavity 4-2 restricts the radial rotation of the shaft 2 to be processed. Together with the tapered structure of the right push pin 3-1 and the tapered surface of the connecting force-bearing cavity 3-2, a double constraint of left tooth profile anti-rotation and right tapered surface centering is formed to prevent circumferential rotation or radial sway during processing.

[0022] This multi-component collaborative mode has significant core advantages. In terms of precise positioning, the synergy of conical centering, thread adjustment, and tooth anti-rotation achieves all-round constraint on the shaft 2 to be processed in the axial, radial, and circumferential directions, and the coaxiality error is controllable. In terms of force balance, the load distribution and synergy of the force-bearing inner liner component 4 and the adjustment and fixing component 3 avoid deformation caused by excessive local force. The strong adaptability is reflected in the cooperation between the thread adjustment structure and the replaceable positioning block 4-3 and the limit plate 4-4, which can adapt to shaft workpieces of different lengths and inner diameters without the need to replace the entire fixing top component. The high stability comes from the rigid connection and self-locking structure of each component, which ensures that the clamping force and positioning state remain stable during processing and effectively resists interference from vibration, cutting force, etc.

[0023] refer to Figure 1 and Figure 3 In some embodiments, the positioning cavity 3-4 is provided with a threaded post 3-6, the push rod 3-5 is provided with a threaded cavity 3-7, the threaded post 3-6 is screwed onto the threaded cavity 3-7, the positioning plate 3-3 is provided with an insertion groove 3-8, and the push rod 3-5 is inserted into the insertion groove 3-8.

[0024] In some examples, the left push rod 3-5 adjusts the axial clamping force by screwing the threaded post 3-6 and the threaded cavity 3-7, while the right push pin 3-1 provides an auxiliary clamping reaction force through its tapered insertion structure, forming a two-way force of left pushing and right pushing. The self-locking characteristic of the threaded drive ensures stable clamping force and avoids force attenuation caused by vibration.

[0025] like Figures 1-3 As shown, on the other hand, this utility model also provides a force-bearing inner liner assembly 4, including a plug cavity 4-1, which is opened inside the shaft 2 to be processed. The inner side wall of the plug cavity 4-1 is provided with an internal tooth cavity 4-2. A positioning block 4-3 is inserted into the internal tooth cavity 4-2. One end of the positioning block 4-3 is provided with a limiting plate 4-4, which is in contact with the push rod 3-5.

[0026] In some examples, the components form a closed-loop working logic of positioning, clamping, and stabilization. In the initial positioning stage, the right ejector pin 3-1 inserts into the connecting force-receiving cavity 3-2, using its conical surface for self-positioning to initially center the shaft 2 to be processed. The left ejector rod 3-5 extends through thread adjustment, pushing the limiting plate 4-4 to engage with the left end of the shaft 2 to achieve axial positioning. In the clamping and strengthening stage, the ejector rod 3-5 is further tightened, and the clamping force is transmitted to the shaft 2 through the force-receiving inner liner assembly 4. The right end of the shaft 2 engages with the conical surface of the ejector pin 3-1 through the connecting force-receiving cavity 3-2, generating… The reaction force balances the left-side clamping force to achieve bidirectional clamping. Simultaneously, the positioning block 4-3 engages with the internal gear cavity 4-2 to restrict circumferential rotation, and the ejector pin 3-1 cooperates with the connected force-receiving cavity 3-2 to restrict radial sway. During the stable machining phase, external loads such as cutting forces are transmitted to the force-receiving inner liner assembly 4 via the shaft to be machined 2. The load is dispersed through the meshing surface of the positioning block 4-3 and the contact surface of the limiting disc 4-4. The self-locking thread and tapered contact structure of the adjusting fixing assembly 3 ensure that the clamping force and positioning accuracy do not decrease. All components work together to resist interference and maintain the stability of the shaft to be machined 2.

[0027] refer to Figure 1 and Figure 3 In some embodiments, the positioning block 4-3 is seamlessly connected to the internal gear cavity 4-2, and the limiting disk 4-4 is attached to the side wall of the shaft 2 to be processed.

[0028] In some examples, the clamping force of the left push rod 3-5 acts on the limiting plate 4-4, and is transmitted to the positioning block 4-3 through the fixed connection between the limiting plate 4-4 and the positioning block 4-3. The positioning block 4-3 is seamlessly inserted into the inner tooth cavity 4-2 of the shaft to be processed and the teeth mesh, ensuring that the force is transmitted to the inner wall of the shaft to be processed without slippage loss, forming a rigid force chain of push rod 3-5-limiting plate 4-4-positioning block 4-3-shaft to be processed 2.

[0029] For example, such as Figure 1 As shown, a connecting plate 5 is connected to the top post 1 on the right side, and the side wall of the connecting plate 5 is fixedly connected to the ejector pin 3-1.

[0030] In some examples, the left positioning plate 3-3 inserts into the slot 3-8 to guide and prevent the push rod 3-5 from tilting. The fixing structure of the right connecting plate 5 and the push pin 3-1 ensures that the tip of the push pin 3-1 is aligned with the center of the connecting force cavity 3-2, ensuring that the adjustment action is accurately transmitted and adapting to shafts 2 of different lengths to be processed.

[0031] For example, such as Figure 1 As shown, a top plate 6 is installed on the top column 1 on the left side, and the top plate 6 is fixedly connected to the positioning plate 3-3.

[0032] In some examples, the left and right adjustment fixing components 3 form a top-to-bottom constraint at both ends with the left and right top columns 1 as the installation reference. In terms of axis alignment, the left top column 1 is fixed to the positioning plate 3-3 through the top plate 6, and the right top column 1 is fixed to the ejector pin 3-1 through the connecting plate 5. During assembly, it is ensured that the axis of the left top column 1-positioning plate 3-3-top rod 3-5 is consistent with that of the right top column 1-connecting plate 5-ejector pin 3-1.

[0033] For example, such as Figure 2 As shown, the ejector pin 3-1 has a conical structure, and the tip of the ejector pin 3-1 is inserted into the interior of the force-receiving cavity 3-2.

[0034] In some examples, when the conical structure of ejector pin 3-1 is inserted into the connecting force-bearing cavity 3-2, the radial deviation of the shaft to be processed 2 is corrected by the self-positioning of the conical surface, and the axial clamping is achieved with the left ejector pin 3-5, realizing the dual constraint of radial centering and axial positioning, and controlling the clamping force.

[0035] For example, such as Figure 2 As shown, the two top pillars 1 are located at opposite ends of the shaft 2 to be processed, and the force-receiving cavity 3-2 and the positioning cavity 3-4 are located at opposite ends of the shaft 2 to be processed.

[0036] During operation, the core mechanism of the shaft workpiece is the coordination of external constraint and internal support. By adjusting the cooperation between the fixing component 3 and the force-bearing inner lining component 4, the shaft 2 to be processed is accurately positioned and stably fixed, providing a reliable guarantee for the processing. Its working principle revolves around three key stages: positioning, clamping, and load bearing. Each component is divided according to its function and cooperates with each other to form a complete working system.

[0037] In the precise positioning stage, the left and right top columns 1 are used as the basic installation reference to construct a constraint frame with both ends aligned. The left top column 1 is fixedly connected to the positioning plate 3-3 through the top plate 6, while the right top column 1 is stably assembled with the ejector pin 3-1 through the connecting plate 5. During the assembly process, it is strictly ensured that the axes of the left top column 1-positioning plate 3-3-top rod 3-5 and the right top column 1-connecting plate 5-ejector pin 3-1 are coaxial, providing a reference for the positioning of the shaft 2 to be processed. The right ejector pin 3-1 adopts a conical structure. When its tip is inserted into the connecting force cavity 3-2 at the right end of the shaft 2 to be processed, the self-positioning characteristics of the conical surface are used to automatically correct the radial offset of the shaft 2 to be processed, completing the initial centering. At the same time, the left top rod 3-5 extends through the thread adjustment, and its end contacts the limiting plate 4-4 on the inner side of the left end of the shaft 2 to be processed, pushing the limiting plate 4-4 to fit against the inner wall of the shaft 2 to be processed, thereby fixing the axial position of the shaft 2 to be processed. Thus, the dual preliminary positioning of the shaft 2 to be processed, both radial and axial, is completed.

[0038] During the bidirectional clamping stage, stable clamping is achieved through force balance based on the initial positioning. The left push rod 3-5 and the threaded post 3-6 inside the positioning plate 3-3 are screwed together through the threaded cavity 3-7. Continuing to screw the push rod 3-5 can precisely adjust its axial clamping force. This force is transmitted to the positioning block 4-3 through the limiting plate 4-4. The positioning block 4-3 is seamlessly inserted into the internal gear cavity 4-2 inside the shaft to be processed 2, and the teeth mesh, ensuring that the clamping force is transmitted to the inner wall of the shaft to be processed 2 without loss. Under the action of the clamping force on the left side, the right end of the shaft to be processed... By tightly fitting the connecting force chamber 3-2 with the conical surface of the ejector pin 3-1, a reverse auxiliary clamping force is generated, forming a bidirectional force of left pushing and right pushing. Since the threaded drive has a self-locking characteristic, it can effectively prevent the clamping force from being attenuated due to processing vibration. At the same time, the insertion groove 3-8 of the left positioning plate 3-3 provides radial guidance for the ejector pin 3-5, preventing the ejector pin 3-5 from deflecting. The right connecting plate 5 ensures that the tip of the ejector pin 3-1 is always aligned with the center of the connecting force chamber 3-2, ensuring accurate transmission of clamping force and achieving stable clamping of the shaft 2 to be processed.

[0039] During the load-bearing stage of machining, the load-bearing inner liner assembly 4 and the adjusting and fixing assembly 3 work together to disperse the load and maintain the stability of the shaft 2 to be machined. External loads such as cutting force and centrifugal force generated during machining can easily cause local stress concentration and deformation if they are directly applied to the shaft 2 to be machined. However, the load-bearing inner liner assembly 4 can disperse the concentrated load into surface load and tooth surface load through the large-area contact between the limiting plate 4-4 and the inner wall of the shaft 2 to be machined, and the toothed engagement between the positioning block 4-3 and the inner tooth cavity 4-2. The load is then transmitted to the push rod 3-5 through the positioning block 4-3 and the limiting plate 4-4, and finally borne by the left and right push columns 1. At the same time, the toothed engagement between the positioning block 4-3 and the inner tooth cavity 4-2 can restrict the circumferential rotation of the shaft 2 to be machined. The contact between the right push pin 3-1 and the conical surface of the connecting force-bearing cavity 3-2 can further constrain the radial swing. Combined with the rigid structure and self-locking characteristics of the adjusting and fixing assembly 3, the clamping force and positioning accuracy are ensured to remain unchanged, so that the shaft 2 to be machined remains stable without movement or deformation throughout the entire machining process.

[0040] In summary, the entire working process achieves the positioning and clamping of the shaft 2 to be processed by adjusting the fixing component 3, and completes the force transmission and load distribution with the help of the force-bearing inner liner component 4. The components form a closed loop and work together, which not only ensures the positioning accuracy but also improves the processing stability. At the same time, the threaded adjustment and replaceable inner liner components enable the adaptation to shaft workpieces of different specifications, meeting diverse processing needs.

[0041] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A fixing top for shaft-type workpieces, characterized in that, include Top column (1), the inner side of which is provided a shaft (2) to be processed; Adjustable fixing component (3), which is disposed on the top column (1); A load-bearing inner liner assembly (4) is disposed inside the shaft to be processed (2); The adjusting and fixing assembly (3) includes a pin (3-1) and two top posts (1). The pin (3-1) is located on the top post (1) on the right side. The shaft to be processed (2) has a connecting force cavity (3-2) inside. A part of the pin (3-1) is embedded inside the connecting force cavity (3-2). A positioning plate (3-3) is located on the top post (1) on the left side. A positioning cavity (3-4) is located inside the positioning plate (3-3). A top rod (3-5) is located inside the positioning cavity (3-4). The top rod (3-5) is in contact with the shaft to be processed (2).

2. The fixing top member for shaft-type workpieces according to claim 1, characterized in that, The positioning cavity (3-4) is provided with a threaded post (3-6), the push rod (3-5) is provided with a threaded cavity (3-7), the threaded post (3-6) is screwed onto the threaded cavity (3-7), the positioning plate (3-3) is provided with a insertion groove (3-8), and the push rod (3-5) is inserted into the insertion groove (3-8).

3. A fixing top for shaft-type workpieces according to claim 1, characterized in that, The force-bearing inner liner assembly (4) includes a plug-in cavity (4-1) which is opened inside the shaft to be processed (2). The inner sidewall of the plug-in cavity (4-1) is provided with an internal tooth cavity (4-2). A positioning block (4-3) is inserted inside the internal tooth cavity (4-2). One end of the positioning block (4-3) is provided with a limiting plate (4-4), which is in contact with the push rod (3-5).

4. A fixing top for shaft-type workpieces according to claim 3, characterized in that, The positioning block (4-3) is seamlessly connected to the internal gear cavity (4-2), and the limiting plate (4-4) is attached to the side wall of the shaft to be processed (2).

5. A fixing top for shaft-type workpieces according to claim 1, characterized in that, A connecting plate (5) is connected to the top post (1) located on the right side, and the side wall of the connecting plate (5) is fixedly connected to the top pin (3-1).

6. A fixing top for shaft-type workpieces according to claim 1, characterized in that, A top plate (6) is provided on the top column (1) located on the left side, and the top plate (6) is fixedly connected to the positioning plate (3-3).

7. A fixing top for shaft-type workpieces according to claim 1, characterized in that, The ejector pin (3-1) has a conical structure, and the tip of the ejector pin (3-1) is inserted into the interior of the connecting force-receiving cavity (3-2).

8. A fixing top for shaft-type workpieces according to claim 1, characterized in that, The two top posts (1) are located at opposite ends of the shaft to be processed (2), and the connecting force cavity (3-2) and the positioning cavity (3-4) are located at opposite ends of the shaft to be processed (2).

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