Tool clamp and machining method for backbone extension section prosthesis

Abstract

The invention discloses a work fixture and a machining method for a backbone extension section prosthesis, the work fixture comprises a hydraulic chuck and a positioning tool, the positioning tool is installed in the hydraulic chuck, the hydraulic chuck comprises a chuck base body, and three clamping jaws evenly distributed in the annular direction are installed on one side of the outer portion of the chuck base body; the positioning tool comprises a positioning shell, the positioning shell is arranged in the chuck base body, and a positioning head is arranged at the end, close to the clamping jaw, of the positioning shell. And the positioning screw rod is placed in the positioning shell, and the two ends of the positioning screw rod penetrate through and extend to the exterior of the positioning shell. Through the design that the vertical reference surface of the tool positioning main body is perpendicular to the chuck jaw and the reference surface of the positioning screw is parallel, the angle and length reference unification is realized; one-time clamping forming is achieved through a turning and milling composite machine tool, four procedures are reduced to two procedures, the efficiency is doubled, the concentricity is high, and the maintenance cost is low.

Description

Technical Field

[0001] The present invention relates to the field of artificial joint manufacturing, in particular to a tooling fixture and a processing method for a diaphysis extension prosthesis. Background Art

[0002] The machining accuracy of the diaphyseal extension prosthesis directly impacts the effectiveness of joint replacement surgery. The prosthesis structure includes features such as an outer cone at the head, a flattened portion at the head, an inner cone at the tail, and a flattened portion at the tail. The manufacturing process must balance dimensional accuracy and structural stability.

[0003] Traditional machining methods involve a four-step process: turning the head's outer taper, milling the flattening, turning the tail's inner taper, and then milling the flattening. This process requires the collaboration of a CNC lathe and a vertical machining center. The head's outer taper is first machined on the CNC lathe, then transferred to the machining center for milling the flattened portion. The part is then re-clamped, the tail's inner taper is machined on a lathe, and finally the flattened portion is milled.

[0004] The above prior art has the following disadvantages: 1. The process is cumbersome and inefficient: the four processes require frequent equipment switching, the processing cycle is long, and the secondary clamping causes concentricity deviation; 2. Inconsistent positioning datum: When machining the tail, the remaining machining allowance is calculated manually, and there is no unified length datum, resulting in a high probability of error. 3. High tooling maintenance cost: Traditional tooling lacks anti-cutting protection design, and cutting damage directly acts on the positioning body, resulting in high replacement costs.

[0005] Therefore, a fixture and a processing method for a diaphysis extension prosthesis are proposed. Summary of the Invention

[0006] In view of the deficiencies in the prior art, the present invention provides a fixture and a processing method for a diaphyseal extension prosthesis to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above-mentioned object, the present invention provides the following technical solution: a fixture for a diaphyseal extension prosthesis, comprising: A hydraulic chuck and a positioning tool, wherein the positioning tool is installed inside the hydraulic chuck. The hydraulic chuck comprises: a chuck base, and three claws evenly distributed along a ring are installed on one side of the outer side of the chuck base; The positioning tool comprises a positioning shell, the positioning shell is placed inside the chuck base, and a positioning head is provided at one end of the positioning shell close to the clamping claw; A positioning screw is placed inside the positioning housing, with both ends of the positioning screw passing through and extending to the outside of the positioning housing; A locking nut is provided at the end of the positioning screw away from the positioning head, and the locking nut is connected to the positioning screw through threaded engagement, a limiting groove is provided on the outer side of the positioning housing, and adjustment nodes are provided inside the locking screw along the length direction of the limiting groove at equal intervals; A locking screw is provided inside the adjustment node; The exterior of the positioning head is circularly cut with three equally spaced vertical reference surfaces; A length reference surface is formed on one end of the positioning screw away from the locking nut; An angle reference surface is provided on the inner side of one end of the positioning screw facing away from the locking nut; During installation, first place the positioning housing inside the chuck base, adjust it so that the positioning head is aligned with the clamping claw, and then use countersunk screws to pass through the reserved holes on the positioning housing and the chuck base to fix it. The anti-cutting protective cover is placed outside the positioning housing and locked with the countersunk screws to prevent damage to the positioning housing during the cutting process. By integrating the hydraulic chuck and positioning tooling, precise positioning and efficient processing are achieved during the prosthesis processing. The jaw design of the hydraulic chuck utilizes the three-jaw self-centering principle to ensure the stability and concentricity of the prosthesis during the processing. The positioning shell and positioning screw in the positioning tooling achieve precise control of the prosthesis processing length and angle through the setting of the length reference plane and the angle reference plane, avoiding manual calculation errors. At the same time, the use of the locking nut and the locking screw further locks the processing position of the prosthesis and ensures processing accuracy. The combination of this tooling fixture and processing method simplifies the processing process and reduces equipment replacement time.

[0008] Preferably, the positioning head is fixedly connected to the hydraulic chuck by countersunk screws, an anti-cutting protective sleeve is provided on the outer side of the positioning housing located outside the positioning head, and the anti-cutting protective sleeve is fixed to the positioning housing by countersunk screws; A threaded hole matching the countersunk screw is pre-opened on the positioning head, and a threaded hole or through hole is also opened at the corresponding position of the hydraulic chuck. The countersunk screw is sequentially passed through the threaded holes of the hydraulic chuck and the positioning head to achieve a fixed connection between the two. At the same time, a mounting groove is opened on the outside of the positioning housing on the outer side of the positioning head. The anti-cutting protective sleeve is inserted into the mounting groove and fixed with a countersunk screw passing through the anti-cutting protective sleeve and the corresponding holes on the positioning housing to prevent damage to the positioning housing during the cutting process. This fixing method is stable and reliable, and can ensure the stability of the positioning head and positioning housing during the processing, thereby improving the processing accuracy. Secondly, the setting of the anti-cutting protective cover effectively isolates the damage during the cutting process, protects the positioning housing from the impact of cutting, and extends the service life of the tooling fixture. At the same time, when the anti-cutting protective cover is worn or damaged, it can be easily replaced by removing the countersunk screws, reducing maintenance costs. In addition, this design also facilitates the assembly and disassembly of the tooling fixture, thereby improving production efficiency.

[0009] Preferably, the tail diameter of the locking screw is larger than the width of the limiting slot, and the locking screw is connected to the adjustment node through threaded engagement; The tail of the locking screw is designed to be larger than the width of the limit slot to ensure that the screw will not slip out of the limit slot during adjustment, ensuring the stability of the adjustment. At the same time, the locking screw and the adjustment node cooperate through fine threads, so that the positioning screw can be firmly locked after being adjusted to the desired position, preventing displacement during processing and ensuring processing accuracy. The design of the locking screw tail diameter being larger than the width of the limit slot effectively prevents accidental slipping during the adjustment process, ensuring the safety of operation. At the same time, the locking screw and the adjustment node are tightly matched through the thread, so that the positioning screw can be firmly locked after being adjusted to the precise position, avoiding displacement during the processing process, thereby ensuring the dimensional accuracy and shape consistency of the workpiece.

[0010] Preferably, the length reference surface is integrally formed with the positioning screw, and the length reference surface is used to abut and position with the tail end face of the diaphyseal extension prosthesis. After being locked by the locking nut and the locking screw, the length margin of the prosthesis processing is limited to avoid manual calculation errors. During processing, the tail end face of the prosthesis of the extended diaphysis is tightly contacted with the length reference plane. By rotating the locking nut and adjusting the locking screw, it is matched with the adjustment node on the positioning screw to achieve multi-level length adjustment and locking, thereby accurately controlling the length margin of the prosthesis processing and effectively avoiding manual calculation errors. By directly contacting and positioning the length reference surface with the end face of the prosthesis tail, combined with the locking mechanism of the locking nut and locking screw, precise control of the processing length allowance is achieved, effectively avoiding the errors that may be caused by manual calculation. This design not only simplifies the processing process and reduces the need for secondary clamping, but also ensures the consistency and accuracy of the processing of each prosthesis through a unified positioning reference.

[0011] Preferably, the angle reference surface is integrally formed with the positioning screw, and the tool is tilted along the angle reference surface by adjusting the spindle angle of the CNC lathe, thereby achieving precise control of the processing angle of the flat part of the prosthesis; The CNC system pre-sets the spindle's required rotation angle, which matches the inclination angle of the angle reference surface. During machining, the CNC system automatically controls the spindle to rotate to the set angle, and then the turning tool mills the prosthesis along this inclination angle, ensuring that the machining angle of the flat part of the prosthesis is precisely controllable. Through the precise control of the CNC system, the tool can perform tilt milling along the preset angle reference plane, avoiding the errors that may be caused by traditional manual adjustment. This design not only simplifies the operation process and reduces human intervention, but also greatly improves processing efficiency and quality stability. At the same time, due to the integrated design of the angle reference plane and the positioning screw, the overall rigidity and durability of the tooling are enhanced, further ensuring the reliability and repeatability of the processing process.

[0012] Preferably, a limiting ring is provided on the outer side of the positioning screw near the angle reference plane, and the limiting ring is fixedly connected to the positioning screw; The limiting ring can adopt an annular structure with an inner diameter slightly larger than the outer diameter of the positioning screw. It is fixed to the positioning screw by welding, interference fit or threaded connection to ensure that there is no relative movement between the limiting ring and the positioning screw, thereby limiting the extension distance of the positioning screw and ensuring processing safety; The fixed connection method of the limit ring ensures its synchronous movement with the positioning screw, effectively limits the extension distance of the positioning screw, and prevents safety accidents caused by excessive extension of the positioning screw during processing. At the same time, this design also simplifies the processing process, reduces the time and effort required to adjust the extension distance of the positioning screw, and improves processing efficiency. In addition, the existence of the limit ring also provides additional support for the positioning screw and enhances its structural stability.

[0013] Preferably, the angle reference plane is parallel to the vertical reference plane, and the vertical reference plane is perpendicular to the claw; In practical applications, high-precision machining can be used to ensure the perpendicular relationship between the vertical reference plane of the positioning head and the clamping claws. The angle adjustment function of the CNC lathe spindle can then be used to tilt the tool along the angle reference plane parallel to the vertical reference plane, thereby accurately controlling the machining angle of the flat part of the prosthesis. By optimizing the design of the tooling fixture, the parallel setting of the angle reference plane and the vertical reference plane, as well as the perpendicular relationship between the vertical reference plane and the clamping claw are achieved. This design ensures the precise positioning of the prosthesis during the processing, and effectively solves the problems of inaccurate positioning and cumbersome operation in traditional processing methods. The combination of turning and milling composite CNC machine tools and optimized tooling fixtures not only improves the processing efficiency, but also ensures the processing quality, so that the processing angle of the flat part of the prosthesis can be precisely controlled. At the same time, through the setting of the tooling fixture, the total length of the prosthesis can be uniformly set, avoiding the tedious process of calculating the remaining processing allowance one by one.

[0014] Preferably, the limiting ring contacts the inner wall of the positioning housing to limit the extension distance of the positioning screw; The limiting ring is fixed to the positioning screw by welding or threaded fastening. When the positioning screw moves in the positioning housing, the limiting ring will contact the inner wall of the positioning housing, thereby preventing the positioning screw from extending further, thereby limiting the extension distance of the positioning screw. Through the ingenious combination of hydraulic chuck and positioning fixture, it is possible to complete multiple processing steps with one clamping of the workpiece, avoiding the concentricity deviation problem caused by multiple clamping in traditional methods. The positioning screw, locking nut and locking screw and other components in the positioning fixture jointly ensure the precise control of the workpiece processing length and reduce manual calculation errors. At the same time, the setting of the anti-cutting protection sleeve effectively protects the fixture from cutting damage and extends its service life. In terms of processing methods, through the introduction of turning and milling compound CNC machine tools, the integrated processing of the outer cone and flattening of the head and the inner cone and flattening of the rear is realized, which not only simplifies the operation process, but also greatly shortens the processing time.

[0015] A method for processing a diaphysis prosthesis is provided, based on the above-mentioned fixture for the diaphysis prosthesis, and comprises the following steps: Step 1: Clamping the blank bar: The prosthesis of the extended diaphysis is placed in the jaws of the hydraulic chuck in the form of a blank bar and clamped using the three-jaw self-centering principle; Step 2: Turning the outer cone of the head: Use the turning tool of the turning-milling compound machine tool to perform external taper turning on the head of the blank bar; Step 3: Milling the flat part of the head: Keep the prosthesis of the extended diaphysis intact and use a milling cutter to mill the area behind the outer cone of the head to form a flat part of the head; Step 4: Tooling positioning and installation: Install the positioning fixture to the hydraulic chuck, fix the positioning housing to the chuck base with countersunk screws, and install and lock the anti-cutting protective sleeve on the outside of the positioning housing; Step 5: Tail forming process: Insert the processed head of the diaphyseal extension prosthesis into the interior of the positioning head, adjust the positioning screw so that the length reference surface is aligned with the tail of the diaphyseal extension prosthesis, and fix it with the locking nut and locking screw; use a turning and milling compound machine tool to turn the inner cone of the tail and mill the flat part of the tail in sequence to complete the molding in one step; In step 4, when positioning and installing the tooling, first firmly fix the positioning housing to the chuck base with countersunk screws to ensure accurate positioning. Then, put the anti-cutting protective sleeve on the outside of the positioning housing and lock it with screws to prevent damage to the tooling during cutting. In step 5, adjust the extension length of the positioning screw by rotating it so that the length reference plane is accurately aligned with the tail of the diaphyseal extension prosthesis. Then, use the locking nut and locking screw to fix it to ensure stability during processing. The blank bar is placed directly into the hydraulic chuck and clamped using the three-jaw self-centering principle to ensure the stability and concentricity of the clamping. Subsequently, the outer cone turning of the head and the flat part milling of the head are completed at one time by a turning-milling compound machine tool, without the need for secondary clamping, thereby improving the processing efficiency. During the tooling positioning and installation stage, the countersunk screws and anti-cutting protective sleeves are used to fix the tooling, which not only ensures the stability of the tooling but also prevents cutting damage. Finally, during the tail forming processing stage, the positioning screw is adjusted and the length reference plane and the angle reference plane are used for precise positioning, thereby realizing the one-time forming processing of the inner cone and the flat part of the tail, ensuring the processing accuracy and consistency. This method not only simplifies the processing process, but also reduces the number of equipment replacements and clamping times.

[0016] Preferably, in step 4, the anti-cutting protective sleeve is fixed to the positioning housing by countersunk screws to isolate cutting damage; In step five, when adjusting the positioning screw, multi-level length adjustment is performed through the cooperation between the limit slot and the adjustment node; The anti-cutting protection sleeve is installed on the outside of the positioning housing on one side of the positioning head, and a countersunk screw is used to pass through the reserved hole on the anti-cutting protection sleeve and screwed into the threaded hole of the positioning housing to complete the fastening connection, thereby isolating the cutting damage. In step five, when adjusting the positioning screw, the multi-level length adjustment is performed through the cooperation between the limit groove and the adjustment node. The specific implementation method is: move the positioning screw in the positioning housing so that the adjustment node is aligned with the required position on the limit groove, and then screw the locking screw into the adjustment node until the part with a tail diameter larger than the width of the limit groove is against the edge of the limit groove, thereby completing the multi-level length adjustment of the positioning screw; In step four, the anti-cutting protective cover is fixed to the positioning shell with countersunk screws. This design effectively isolates cutting damage, protects the key components of the fixture, extends the service life and reduces maintenance costs. In step five, multi-level length adjustment is performed through the cooperation of the limit slot and the adjustment node, so that the positioning screw can be quickly and accurately adjusted according to the different specifications of the backbone extension prosthesis, ensuring the accuracy of the length reference during the processing, avoiding manual calculation errors, and improving processing efficiency and accuracy.

[0017] In summary, compared with the prior art, the present invention provides a fixture and processing method for a diaphyseal extension prosthesis, which has the following beneficial effects: This invention achieves unified processing angle datum by installing the positioning fixture in the hydraulic chuck and utilizing the design that the vertical reference surface of the positioning head is perpendicular to the clamping claw. Combined with the one-step clamping and forming process of the turning and milling machine tool, the traditional four-step process is simplified to two, doubling the processing efficiency and eliminating the need for secondary clamping. The length reference surface and the angle reference surface of the positioning screw are parallel to the vertical reference surface to ensure the concentricity of the prosthesis head and tail without deviation, thus solving the problem of inconsistent positioning datum in traditional methods. Through the two-way locking structure of the positioning screw, locking nut and locking screw, multi-level adjustment and fixation of prostheses of different lengths and specifications can be achieved, which has the advantages of adapting to batch processing and avoiding manual calculation of allowance errors; the contact design of the limit ring and the inner wall of the positioning shell realizes the safe limitation of the shortest extension distance of the positioning screw, avoiding interference between the turning tool and the chuck; the anti-cutting protective sleeve is detachably connected to the positioning shell through the countersunk screw, realizing centralized protection against cutting damage, and only the protective sleeve needs to be replaced after wear, which has the advantage of reducing tool maintenance costs; the combination of the self-centering principle of the three-jaw chuck and the tool positioning structure realizes the precise positioning of the prosthesis during processing, and has the advantages of high concentricity and small processing deviation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the prosthesis blank clamping of the tooling fixture of the diaphysis extension prosthesis of the invention.

[0019] Figure 2 This is a schematic diagram of the clamping of the prosthesis after processing of the tooling fixture of the diaphysis extension prosthesis of the invention.

[0020] Figure 3 It is a schematic diagram of the positioning fixture and prosthesis clamping of the tooling fixture of the diaphysis extension prosthesis of the invention.

[0021] Figure 4 It is a three-dimensional diagram of the hydraulic chuck and positioning fixture structure of the fixture of the backbone extension prosthesis of the invention.

[0022] Figure 5 It is a three-dimensional diagram of the positioning shell and positioning head structure of the tooling fixture of the diaphysis extension prosthesis of the invention.

[0023] Figure 6 It is a three-dimensional diagram of the positioning screw structure of the tooling fixture of the diaphyseal extension prosthesis of the invention.

[0024] Figure 7 It is a three-dimensional diagram of the prosthetic head of the tooling fixture of the diaphysis extension prosthesis of the invention after processing.

[0025] Figure 8 It is a tail inner cone and tail flat cross-sectional view of the fixture of the diaphysis extension prosthesis of the invention.

[0026] Figure 9 It is a step diagram of the processing method of the diaphysis extension prosthesis of the invention.

[0027] Description of reference numerals: 1. Shaft extension prosthesis; 2. Hydraulic chuck; 3. Positioning tooling; 101. Head is tapered outward; 102. Head is flat; 103. Tail is tapered inward; 104. Tail is flat; 201, chuck base; 202, chuck jaws; 301, positioning housing; 302, anti-cutting protective sleeve; 303, positioning screw; 304, locking nut; 305, locking screw; 306, countersunk screw; 307, limiting groove; 308, adjustment node; 309, limiting ring; 3011, positioning head; 3012, vertical reference plane; 3031, length reference plane; 3032, angle reference plane. DETAILED DESCRIPTION

[0028] The present invention provides a technical solution, a fixture and processing method for a diaphyseal extension prosthesis, please refer to Figure 1-8 ,include: The hydraulic chuck 2 and the positioning tool 3 are installed inside the hydraulic chuck 2. The hydraulic chuck 2 includes: a chuck base 201, and three claws 202 evenly distributed along a ring are installed on one side of the outer side of the chuck base 201; The positioning tool 3 includes a positioning housing 301, which is placed inside the chuck base 201. A positioning head 3011 is provided at one end of the positioning housing 301 close to the claw 202. The positioning screw 303 is placed inside the positioning housing 301, and both ends of the positioning screw 303 pass through and extend to the outside of the positioning housing 301; A locking nut 304 is provided at the end of the positioning screw 303 facing away from the positioning head 3011, and the locking nut 304 is threadably connected to the positioning screw 303. A limiting slot 307 is defined on the exterior of the positioning housing 301, and adjustment nodes 308 are equidistantly distributed along the length of the limiting slot 307 within the locking screw 303. A locking screw 305 is provided inside the adjustment node 308; The outer portion of the positioning head 3011 is cut along a circular shape with three equally spaced vertical reference surfaces 3012; A length reference surface 3031 is formed at one end of the positioning screw 303 away from the locking nut 304; An angle reference surface 3032 is formed on the inner side of one end of the positioning screw 303 facing away from the locking nut 304; During installation, first place the positioning housing 301 inside the chuck base 201, adjust it so that the positioning head 3011 is aligned with the clamping claw 202, and then use the countersunk screw 306 to pass through the reserved holes on the positioning housing 301 and the chuck base 201 to fix it. The anti-cutting protective cover 302 is then placed on the outside of the positioning housing 301 and locked with the countersunk screw 306 to prevent damage to the positioning housing 301 during the cutting process. By integrating the hydraulic chuck 2 and the positioning tool 3, precise positioning and efficient processing are achieved during the prosthesis processing. The design of the jaws 202 of the hydraulic chuck 2 uses the three-jaw self-centering principle to ensure the stability and concentricity of the prosthesis during the processing. The positioning shell 301 and the positioning screw 303 in the positioning tool 3 achieve precise control of the prosthesis processing length and angle through the setting of the length reference surface 3031 and the angle reference surface 3032, avoiding manual calculation errors. At the same time, the use of the locking nut 304 and the locking screw 305 further locks the processing position of the prosthesis and ensures processing accuracy. The combination of this tooling fixture and processing method simplifies the processing process and reduces equipment replacement time.

[0029] See also Figure 1 3. The positioning head 3011 is fixedly connected to the hydraulic chuck 2 by a countersunk screw 306. An anti-cutting protective sleeve 302 is provided on the outer side of the positioning housing 301, and the anti-cutting protective sleeve 302 is fixed to the positioning housing 301 by a countersunk screw 306. A threaded hole matching the countersunk screw 306 is pre-formed on the positioning head 3011, and a threaded hole or through hole is also formed at a corresponding position on the hydraulic chuck 2. The countersunk screw 306 passes through the threaded holes of the hydraulic chuck 2 and the positioning head 3011 in sequence to achieve a fixed connection between the two. At the same time, a mounting groove is formed on the outside of the positioning housing 301 on the outer side of the positioning head 3011. The anti-cutting protective sleeve 302 is inserted into the mounting groove and fixed by passing the countersunk screw 306 through the corresponding holes on the anti-cutting protective sleeve 302 and the positioning housing 301 to prevent damage to the positioning housing 301 during the cutting process. This fixing method is stable and reliable, and can ensure the stability of the positioning head 3011 and the positioning shell 301 during the processing, thereby improving the processing accuracy. Secondly, the setting of the anti-cutting protective cover 302 effectively isolates the damage during the cutting process, protects the positioning shell 301 from the impact of cutting, and extends the service life of the tooling fixture. At the same time, when the anti-cutting protective cover 302 is worn or damaged, it can be easily replaced by removing the countersunk screw 306, reducing maintenance costs. In addition, this design also facilitates the assembly and disassembly of the tooling fixture, thereby improving production efficiency.

[0030] See also Figure 1 、 Figure 3 and Figure 6 The tail diameter of the locking screw 305 is larger than the width of the limiting groove 307, and the locking screw 305 is connected to the adjustment node 308 through threaded engagement; The tail of the locking screw 305 is designed to be larger than the width of the limiting slot 307 to ensure that the screw will not slip out of the limiting slot 307 during the adjustment process, thereby ensuring the stability of the adjustment. At the same time, the locking screw 305 and the adjustment node 308 cooperate through fine threads, so that the positioning screw 303 can be firmly locked after being adjusted to the desired position, preventing displacement during the processing and ensuring processing accuracy. By designing that the diameter of the tail of the locking screw 305 is larger than the width of the limiting groove 307, accidental slipping out during the adjustment process is effectively prevented, ensuring the safety of the operation. At the same time, the locking screw 305 and the adjustment node 308 are tightly matched through the thread, so that the positioning screw can be firmly locked after being adjusted to the precise position, avoiding displacement during the processing process, thereby ensuring the dimensional accuracy and shape consistency of the workpiece.

[0031] See also Figure 6 The length reference surface 3031 is integrally formed with the positioning screw 303, and the length reference surface 3031 is used to abut and position with the tail end face of the diaphyseal extension prosthesis 1. After being locked by the locking nut 304 and the locking screw 305, the length margin of the prosthesis processing is limited to avoid manual calculation errors; During processing, the tail end face of the diaphyseal extension prosthesis 1 is tightly contacted with the length reference surface 3031. By rotating the locking nut 304 and adjusting the locking screw 305, it is matched with the adjustment node 308 on the positioning screw 303 to achieve multi-level length adjustment and locking, thereby accurately controlling the length margin of the prosthesis processing and effectively avoiding manual calculation errors. By directly abutting and positioning the length reference surface 3031 with the end face of the prosthesis tail, combined with the locking mechanism of the locking nut 304 and the locking screw 305, precise control of the processing length allowance is achieved, effectively avoiding the errors that may be caused by manual calculation. This design not only simplifies the processing process and reduces the need for secondary clamping, but also ensures the consistency and accuracy of the processing of each prosthesis through a unified positioning reference.

[0032] See also Figure 6 The angle reference surface 3032 and the positioning screw 303 are integrally formed. By adjusting the angle of the CNC lathe spindle, the tool is tilted along the angle reference surface 3032 to achieve precise control of the processing angle of the flat part of the prosthesis; The CNC system pre-sets the spindle's required rotation angle, which matches the inclination angle of the angle reference surface 3032. During the machining process, the CNC system automatically controls the spindle to rotate to the set angle, and then the turning tool mills the prosthesis along the inclination angle, thereby ensuring that the machining angle of the flat part of the prosthesis is precisely controllable. Through the precise control of the CNC system, the tool can perform tilt milling along the preset angle reference surface 3032, avoiding the errors that may be caused by traditional manual adjustment. This design not only simplifies the operation process and reduces human intervention, but also greatly improves processing efficiency and quality stability. At the same time, due to the integrated design of the angle reference surface 3032 and the positioning screw 303, the overall rigidity and durability of the tooling are enhanced, further ensuring the reliability and repeatability of the processing process.

[0033] See also Figure 6 A limiting ring 309 is provided on the outer side of the positioning screw 303 close to the angle reference surface 3032, and the limiting ring 309 is fixedly connected to the positioning screw 303; The limiting ring 309 may be an annular structure with an inner diameter slightly larger than the outer diameter of the positioning screw 303. The limiting ring 309 is fixed to the positioning screw 303 by welding, interference fit, or threaded connection, ensuring that there is no relative movement between the limiting ring 309 and the positioning screw 303, thereby limiting the extension distance of the positioning screw 303 and ensuring processing safety. The fixed connection method of the limit ring 309 ensures its synchronous movement with the positioning screw 303, effectively limits the extension distance of the positioning screw 303, and prevents safety accidents caused by excessive extension of the positioning screw 303 during processing. At the same time, this design also simplifies the processing process, reduces the time and effort required to adjust the extension distance of the positioning screw 303, and improves processing efficiency. In addition, the existence of the limit ring 309 also provides additional support for the positioning screw 303, enhancing its structural stability.

[0034] See also Figure 4 、 Figure 5 and Figure 6 , the angle reference plane 3032 is parallel to the vertical reference plane 3012 , and the vertical reference plane 3012 is perpendicular to the claw 202 ; In practical applications, high-precision machining can be used to ensure the perpendicular relationship between the vertical reference plane 3012 of the positioning head 3011 and the clamping claw 202. The angle adjustment function of the CNC lathe spindle is then used to tilt the tool along the angle reference plane 3032 parallel to the vertical reference plane 3012, thereby accurately controlling the machining angle of the flat part of the prosthesis. By optimizing the design of the tooling fixture, the parallel setting of the angle reference plane 3032 and the vertical reference plane 3012, as well as the perpendicular relationship between the vertical reference plane 3012 and the clamping claw 202 are achieved. This design ensures the precise positioning of the prosthesis during the processing, and effectively solves the problems of inaccurate positioning and cumbersome operation in traditional processing methods. The combination of turning and milling composite CNC machine tools and optimized tooling fixtures not only improves the processing efficiency, but also ensures the processing quality, so that the processing angle of the flat part of the prosthesis can be precisely controlled. At the same time, through the setting of the tooling fixture, the total length of the prosthesis can be uniformly set, avoiding the tedious process of calculating the remaining processing allowance one by one.

[0035] See also Figure 2 、 Figure 3 、 Figure 4 and Figure 6 , the limiting ring 309 contacts the inner wall of the positioning housing 301 to limit the extension distance of the positioning screw 303; The limiting ring 309 is fixed to the positioning screw 303 by welding or threaded fastening. When the positioning screw 303 moves in the positioning housing 301, the limiting ring 309 contacts the inner wall of the positioning housing 301, thereby preventing the positioning screw 303 from extending further, thereby limiting the extension distance of the positioning screw 303. Through the ingenious combination of the hydraulic chuck 2 and the positioning fixture 3, it is possible to complete multiple processing steps with one clamping of the workpiece, avoiding the concentricity deviation problem caused by multiple clamping in the traditional method. The positioning screw 303, locking nut 304 and locking screw 305 and other components in the positioning fixture 3 jointly ensure the precise control of the workpiece processing length and reduce manual calculation errors. At the same time, the setting of the anti-cutting protection sleeve 302 effectively protects the fixture from cutting damage and extends its service life. In terms of processing methods, through the introduction of the turning and milling compound CNC machine tool, the integrated processing of the outer cone and flattening of the front part and the inner cone 103 and flattening of the rear part is realized, which not only simplifies the operation process, but also greatly shortens the processing time.

[0036] A processing method for a diaphyseal prosthesis, based on the above-mentioned tooling fixture for the diaphyseal prosthesis, please refer to Figure 1-8 , including the following steps: Step 1: Clamping the blank bar: The diaphysis prosthesis 1 is placed in the claw 202 of the hydraulic chuck 2 in the form of a blank bar and clamped using the three-claw self-centering principle; Step 2: Turning the outer cone of the head: Use the turning tool of the turning-milling compound machine tool to perform outer cone 101 turning on the head of the blank bar; Step 3: Milling the flat part of the head: Keeping the diaphyseal extension prosthesis 1 intact, the rear area of ​​the head outer cone 101 is milled with a milling cutter to form a head flat portion 102; Step 4: Tooling positioning and installation: Install the positioning tool 3 to the hydraulic chuck 2. The positioning housing 301 is fixed to the chuck base 201 by countersunk screws 306. The anti-cutting protective cover 302 is installed and locked on the outside of the positioning housing 301. Step 5: Tail forming process: Insert the head of the processed diaphysis extension prosthesis 1 into the interior of the positioning head 3011, adjust the positioning screw 303 so that the length reference surface 3031 is aligned with the tail of the diaphysis extension prosthesis 1, and fix it with the locking nut 304 and the locking screw 305; use a turning and milling machine tool to sequentially turn the tail inner cone 103 and mill the tail flat portion 104 to complete the molding process in one step; In step 4, when positioning and installing the tooling, first firmly fix the positioning housing 301 on the chuck base 201 with the countersunk screw 306 to ensure accurate positioning. Then, put the anti-cutting protective cover 302 on the outside of the positioning housing 301 and tighten it with screws to prevent damage to the tooling during cutting. In step 5, by rotating the positioning screw 303, adjust its extension length so that the length reference surface 3031 is accurately aligned with the tail of the diaphysis extension prosthesis 1. Then, use the locking nut 304 and locking screw 305 to fix it to ensure stability during processing. The blank bar is placed directly into the hydraulic chuck 2 and clamped using the three-jaw self-centering principle to ensure the stability and concentricity of the clamping. Subsequently, the turning of the head outer cone 101 and the milling of the head flat part 102 are completed at one time by the turning-milling compound machine tool, without the need for secondary clamping, thereby improving the processing efficiency. During the tooling positioning and installation stage, the countersunk screw 306 and the anti-cutting protective sleeve 302 are used to fix the tooling, thereby ensuring the stability of the tooling and preventing cutting damage. Finally, during the tail forming processing stage, by adjusting the positioning screw 303 and using the length reference plane 3031 and the angle reference plane 3032 for precise positioning, the one-time forming processing of the tail inner cone 103 and the flat part is achieved, ensuring the processing accuracy and consistency. This method not only simplifies the processing process, but also reduces the number of equipment replacements and clamping times.

[0037] See also Figure 1-8 In step 4, the anti-cutting protective cover 302 is fixed to the positioning housing 301 by countersunk screws 306 to isolate cutting damage; In step five, when adjusting the positioning screw 303, multi-level length adjustment is performed through the cooperation between the limiting groove 307 and the adjustment node 308; The anti-cutting protective sleeve 302 is sleeved on the outside of the positioning housing 301 on one side of the positioning head 3011, and a countersunk screw 306 is used to pass through the reserved hole on the anti-cutting protective sleeve 302 and screwed into the threaded hole of the positioning housing 301 to complete the fastening connection, thereby isolating cutting damage. In step five, when adjusting the positioning screw 303, the multi-level length adjustment is performed through the cooperation between the limit groove 307 and the adjustment node 308. The specific implementation method is: the positioning screw 303 is moved in the positioning housing 301 so that the adjustment node 308 is aligned with the required position on the limit groove 307, and then the locking screw 305 is screwed into the adjustment node 308 until the part with a tail diameter larger than the width of the limit groove 307 is against the edge of the limit groove 307, thereby completing the multi-level length adjustment of the positioning screw 303; In step four, the anti-cutting protective cover 302 is fixed to the positioning shell 301 by means of the countersunk screw 306. This design effectively isolates cutting damage, protects the key components of the fixture, extends the service life and reduces maintenance costs. In step five, multi-level length adjustment is performed through the cooperation of the limit groove 307 and the adjustment node 308, so that the positioning screw 303 can be quickly and accurately adjusted according to the different specifications of the backbone extension prosthesis 1, ensuring the accuracy of the length reference during the processing, avoiding manual calculation errors, and improving the processing efficiency and accuracy.

[0038] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0039] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A fixture for a diaphyseal extension prosthesis, characterized in that: include: A hydraulic chuck and a positioning tool, wherein the positioning tool is installed inside the hydraulic chuck. The hydraulic chuck comprises: a chuck base, and three claws evenly distributed along a ring are installed on one side of the outer side of the chuck base; The positioning tool comprises a positioning shell, the positioning shell is placed inside the chuck base, and a positioning head is provided at one end of the positioning shell close to the clamping claw; A positioning screw is placed inside the positioning housing, with both ends of the positioning screw passing through and extending to the outside of the positioning housing; A locking nut is provided at the end of the positioning screw away from the positioning head, and the locking nut is connected to the positioning screw through threaded engagement, a limiting groove is provided on the outer side of the positioning housing, and adjustment nodes are provided inside the locking screw along the length direction of the limiting groove at equal intervals; A locking screw is provided inside the adjustment node; The exterior of the positioning head is circularly cut with three equally spaced vertical reference surfaces; A length reference surface is formed on one end of the positioning screw away from the locking nut; An angle reference surface is formed on the inner side of one end of the positioning screw facing away from the locking nut.

2. The fixture for a diaphyseal extension prosthesis according to claim 1, characterized in that: The positioning head is fixedly connected to the hydraulic chuck by countersunk screws, and an anti-cutting protective sleeve is provided on the outer side of the positioning housing located outside the positioning head, and the anti-cutting protective sleeve is fixed to the positioning housing by countersunk screws.

3. The fixture for a diaphyseal extension prosthesis according to claim 1, characterized in that: The tail diameter of the locking screw is larger than the slot width of the limiting slot, and the locking screw is connected to the adjustment node through threaded fitting.

4. The fixture for a diaphyseal extension prosthesis according to claim 1, characterized in that: The length reference surface and the positioning screw are integrally formed.

5. The fixture for the diaphyseal extension prosthesis according to claim 4, characterized in that: The angle reference surface and the positioning screw are integrally formed.

6. The fixture for the diaphyseal extension prosthesis according to claim 5, characterized in that: A limiting ring is provided on the outer side of the positioning screw rod, close to the angle reference plane, and the limiting ring is fixedly connected to the positioning screw rod.

7. The fixture for the diaphyseal extension prosthesis according to claim 5, characterized in that: The angular reference plane is parallel to the vertical reference plane, and the vertical reference plane is perpendicular to the claw.

8. The fixture for a diaphyseal extension prosthesis according to claim 1, characterized in that: The limiting ring contacts the inner wall of the positioning shell and is used to limit the extension distance of the positioning screw.

9. A method for processing a diaphysis prosthesis, based on the fixture for the diaphysis prosthesis according to any one of claims 1 to 8, characterized in that: The steps include: Step 1: Clamping the blank bar: The prosthesis of the extended diaphysis is placed in the jaws of the hydraulic chuck in the form of a blank bar and clamped using the three-jaw self-centering principle; Step 2: Turning the outer cone of the head: Use the turning tool of the turning-milling compound machine tool to perform external taper turning on the head of the blank bar; Step 3: Milling the flat part of the head: Keep the prosthesis of the extended diaphysis intact and use a milling cutter to mill the area behind the outer cone of the head to form a flat part of the head; Step 4: Tooling positioning and installation: Install the positioning fixture to the hydraulic chuck, fix the positioning housing to the chuck base with countersunk screws, and install and lock the anti-cutting protective sleeve on the outside of the positioning housing; Step 5: Tail forming process: Insert the head of the processed diaphysis prosthesis into the interior of the positioning head, adjust the positioning screw so that the length reference surface is aligned with the tail of the diaphysis prosthesis, and fix it with a locking nut and a locking screw; use a turning and milling compound machine tool to sequentially turn the inner cone of the tail and mill the flat part of the tail to form it in one step.

10. The method for processing a diaphyseal extension prosthesis according to claim 9, characterized in that: In step 4, the anti-cutting protective sleeve is fixed to the positioning housing by countersunk screws to isolate cutting damage; In step five, when adjusting the positioning screw, multi-level length adjustment is performed through the cooperation between the limit slot and the adjustment node.

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