High-pressure elbow ballistic hole positioning clamping device and use method

Abstract

The application discloses a high-pressure elbow ballistic hole positioning and clamping device and a use method, and belongs to the technical field of machining. The device comprises a lathe, a rotary workbench is arranged on the workbench of the lathe, a special rotating shaft is fixed through a three-jaw chuck, a locking mechanism and a limiting mechanism are matched to realize accurate clamping of a workpiece, the rotating shaft realizes centering of an inner hole of the elbow, a locking cone ring cooperates with a plurality of bolts to form a curved surface clamping and locking structure, and an adjustable limiting mechanism limits a processing posture of the elbow. During processing, the device can continuously complete processing of a plurality of groups of different space included angle ballistic holes through reference positioning, rigid locking and rotary positioning. The application discloses the device, which eliminates artificial positioning mode and human measurement error, greatly improves clamping rigidity and hole position processing precision, effectively avoids problems of hole position angle out-of-tolerance and workpiece leakage, simplifies processing procedures, and significantly improves high-pressure elbow batch processing efficiency and pipeline pressure-bearing reliability.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a high-pressure elbow ballistic hole positioning and clamping device and its usage method. Background Technology

[0002] High-pressure elbows are core pressure-bearing components in high-pressure fluid manifold systems. The outer wall of the workpiece has multiple sets of ballistic holes with varying spatial angles. These holes are used for pipe connection and sealing. Strict machining precision requirements are placed on the spatial angles, diameters, and perpendicularity of the hole axes. The high-pressure elbow body has an arc-shaped curved surface structure, lacking a complete planar positioning reference. Conventional tooling with simple pads and indexing plates for clamping and machining has several inherent defects.

[0003] The existing processing scheme relies on manual marking of hole positions as a reference, with pad blocks used to limit the elbow's posture. The entire fixture relies on a single-side pressure plate to clamp the workpiece at a single point. The gap between the curved surface and the fixture support surface is large, resulting in insufficient overall rigidity of the clamping. When the drill bit feeds, the workpiece is prone to slight displacement, causing the ballistic hole axis to deviate and the angle to exceed tolerance. Processing ballistic holes with different angles requires multiple disassemblies and realignments of the workpiece, and repeated adjustments to the indexing device. The process is lengthy and the efficiency of mass production is low. Manual marking is subject to human measurement errors, making it difficult to ensure the consistency of hole positions in batches of workpieces. Elbows with out-of-tolerance angles do not fit tightly after assembly, which can easily lead to leakage under high-pressure conditions, significantly reducing the pressure-bearing reliability of the pipeline.

[0004] Currently, the industry lacks integrated special tooling that can adapt to curved elbow surfaces and complete multi-angle ballistic hole positioning and multiple rigid locking in one go. Existing simple tooling cannot simultaneously achieve the triple constraints of inner hole centering, curved surface clamping, and angle limiting, resulting in multiple shortcomings in positioning accuracy, clamping efficiency, and processing rigidity. There is an urgent need for a new special positioning and clamping device and supporting operation method to solve the above pain points. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the purpose of this invention is to provide a high-pressure elbow ballistic hole positioning and clamping device and its usage method.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A high-pressure elbow ballistic hole positioning and clamping device includes a lathe. A rotary table is provided on one side of the lathe worktable. A rotating shaft is clamped and fixed on the three-jaw chuck of the rotary table. The rotating shaft includes an integrally formed base and a straight section. A pair of symmetrical threaded holes are opened on the end face of the base. The straight section is a cylindrical mandrel with an outer diameter adapted to the inner diameter of the large end of the high-pressure elbow ballistic hole. The high-pressure elbow ballistic hole is locked and fixed on the three-jaw chuck by a locking mechanism. A limiting mechanism for limiting the other end of the high-pressure elbow is provided on the lathe worktable.

[0008] The locking mechanism includes a locking cone ring, multiple clamping bolts, and two locking bolts. The locking cone ring is fitted onto the outer wall of the high-pressure elbow. The locking cone ring has multiple oblique through-hole clamping threads evenly distributed along its circumference. Each threaded hole is fitted with a clamping bolt. A pair of symmetrical locking bolt holes are opened on the end face of the locking cone ring. The two locking threaded holes and the three clamping bolt holes are spatially staggered. After the locking bolts pass through the locking bolt holes of the locking cone ring, they are threadedly connected to the threaded holes of the rotating shaft base to form an axial tensioning structure.

[0009] The limiting mechanism includes a T-bolt and an adjusting block. The adjusting block is placed on the lathe worktable. The T-bolt is slidably engaged in the T-groove of the lathe worktable. The shank of the T-bolt passes upward through the adjusting block and is screwed with a nut.

[0010] Furthermore, the clamping bolts on the outer wall of the locking cone ring are evenly distributed along the circumference of the cone surface. The clamping bolts obliquely penetrate the cone ring and then press against the arc-shaped outer wall of the elbow. This allows the locking force to be evenly distributed to multiple areas of the arc-shaped outer wall of the high-pressure elbow, changing the locking form of localized concentrated force. This helps to improve the overall clamping effect of the locking mechanism on the arc-shaped elbow and further enhances the structural stability of the workpiece after clamping.

[0011] Furthermore, the axial tensioning structure formed by the locking bolt and the rotating shaft chassis avoids the drill bit feed path throughout the entire process; ensuring that the axial locking structure effectively plays its fastening role throughout the entire process and maintaining the clamping rigidity of the workpiece throughout the entire machining process.

[0012] Furthermore, the outer diameter of the straight section of the rotating shaft is smaller than the diameter of the inner ballistic large end hole of the high-pressure elbow, and the inner diameter of the locking cone ring is larger than the outer diameter of the high-pressure elbow.

[0013] A method for using a high-pressure elbow ballistic hole positioning and clamping device includes the following steps:

[0014] S1: After the tooling is pre-installed, the locking cone ring is pre-fitted onto the outer wall of the high-pressure elbow. Hold the elbow and align it with the straight section of the shaft. Push the large end of the inner ballistic ...

[0015] S2: Place the adjusting block in the slide groove of the lathe worktable, slide the T-bolt to move the adjusting block towards the outer wall of the elbow until the adjusting block fits against the outer wall of the high-pressure elbow, tighten the nut to lock the position of the adjusting block, and complete the vertical reference angle positioning of the high-pressure elbow.

[0016] S3: Tighten all the clamping bolts on the outside of the cone ring in sequence and evenly. Each clamping bolt abuts against the inclined outer wall of the large end of the high-pressure elbow along the oblique direction to form a stable radial clamping structure.

[0017] S4: Take two locking bolts and pass them through the locking bolt holes of the cone ring respectively. Align them with the threaded holes of the rotating shaft base and screw them in. Continue to tighten the locking bolts to pull the cone ring against the base, so that the cone ring, high-pressure elbow and rotating shaft are firmly connected as a single rigid whole.

[0018] S5: Start the drilling equipment to process the vertical reference ballistic hole. After processing, loosen the T-bolt, operate the rotary table to drive the high-pressure elbow to rotate, and then adjust the lathe table to move left and right to the corresponding position of the next set of ballistic holes. Re-tighten the T-bolt limit and complete the drilling of the remaining space angle ballistic holes in sequence. After all holes are processed, loosen the locking bolt, clamping bolt, and T-bolt in the opposite direction, remove the processed high-pressure elbow, replace the workpiece to be processed, and repeat the processing.

[0019] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art:

[0020] By setting a rotary table on the lathe worktable, and combining it with a dedicated rotating shaft, locking mechanism, and limiting mechanism to form an integrated clamping and positioning structure, the traditional manual scribing and alignment method is abandoned. Instead of manual reference marking, the mechanical positioning structure significantly reduces positioning deviations caused by human measurement, improves the problem of inconsistent hole positions in batches of workpieces, reduces the risk of leakage under high pressure after workpiece assembly, and enhances the overall pressure-bearing reliability of the pipeline system. The traditional single-point simple clamping method of tooling is changed; the rotating shaft provides internal hole positioning support for the large end of the high-pressure elbow, and the locking mechanism completes the overall locking of the end. Simultaneously, the limiting mechanism limits the posture of the other end of the elbow, effectively reducing the slight displacement of the workpiece during drill bit feed and improving machining defects such as ballistic hole axis misalignment and angular deviations. Utilizing the rotation adjustment function of the rotary table, combined with an adjustable limiting structure, continuous positioning machining of multiple sets of ballistic holes with different spatial angles can be completed, simplifying machining processes, shortening the workflow, and effectively improving the machining efficiency of batch workpieces. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present invention;

[0022] Figure 2 This is a top view of the structure according to an embodiment of the present invention;

[0023] Explanation of reference numerals in the attached drawings: 1. Rotary worktable; 2. Lathe worktable surface; 3. Three-jaw chuck; 4. Rotary shaft; 5. Conical ring; 6. Clamping bolt; 7. Locking bolt; 8. T-bolt; 9. Adjusting block; 10. High-pressure elbow. Detailed Implementation

[0024] The present invention will be further illustrated below with reference to specific embodiments. The purpose of this illustration is solely to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0025] like Figures 1 to 2 As shown in the figure, this embodiment provides a positioning and clamping device for the ballistic hole of a high-pressure elbow 10, including a lathe. A rotary table 1 is provided on one side of the lathe worktable 2. A rotating shaft 4 is clamped and fixed on the three-jaw chuck 3 of the rotary table 1. The rotating shaft 4 includes an integrally formed base and a straight section. A pair of symmetrical threaded holes are opened on the end face of the base. The straight section is a cylindrical mandrel with an outer diameter adapted to the inner diameter of the large end of the ballistic hole of the high-pressure elbow 10. The large end of the ballistic hole of the high-pressure elbow 10 is locked and fixed on the three-jaw chuck 3 by a locking mechanism. A limiting mechanism for limiting the other end of the high-pressure elbow 10 is provided on the worktable 2 of the lathe.

[0026] The locking mechanism includes a locking cone ring 5, multiple clamping bolts 6, and two locking bolts 7. The locking cone ring 5 is fitted onto the outer wall of the high-pressure elbow 10. The locking cone ring 5 has multiple oblique through-hole clamping threads evenly opened along its circumference. Each threaded hole is fitted with a clamping bolt 6. A pair of symmetrical locking bolt 7 holes are opened on the end face of the locking cone ring 5. The two locking threaded holes and the three clamping bolt 6 holes are spatially staggered. After the locking bolts 7 pass through the locking bolt holes of the locking cone ring 5, they are threadedly connected to the threaded holes of the chassis of the rotating shaft 4 to form an axial tensioning structure.

[0027] The limiting mechanism includes a T-bolt 8 and an adjusting block 9. The adjusting block 9 is placed on the lathe worktable 2. The T-bolt 8 is slidably engaged in the T-groove of the lathe worktable 2. The shaft of the T-bolt 8 passes through the adjusting block 9 and is screwed with a nut.

[0028] The clamping bolts 6 on the outer wall of the locking conical ring 5 are evenly distributed along the circumference of the conical surface. The clamping bolts 6 obliquely penetrate the conical ring 5 and then press against the arc-shaped outer wall of the high-pressure elbow 10. This allows the locking force to be evenly distributed to multiple areas of the arc-shaped outer wall of the high-pressure elbow 10, changing the locking form of localized concentrated force. This helps to improve the overall clamping effect of the locking mechanism on the arc-shaped high-pressure elbow 10 and further enhances the structural stability of the workpiece after clamping.

[0029] The axial tensioning structure formed by the locking bolt 7 and the rotating shaft 4 avoids the drill bit feed path throughout the entire process; ensuring that the axial locking structure effectively plays its fastening role throughout the entire process and maintaining the clamping rigidity of the workpiece throughout the entire machining process.

[0030] The outer diameter of the straight section of the rotating shaft 4 is smaller than the inner ballistic end diameter of the high-pressure elbow 10, and the inner diameter of the locking cone ring 5 is larger than the outer diameter of the high-pressure elbow 10.

[0031] A method for using a ballistic hole positioning and clamping device for a high-pressure elbow includes the following steps:

[0032] S1: After the tooling is pre-installed, the locking cone ring 5 is pre-fitted onto the outer wall of the high-pressure elbow 10. Hold the high-pressure elbow 10 and align it with the straight section of the shaft 4. Push the large end of the inner ballistic trajectory of the high-pressure elbow 10 along the straight section of the shaft 4 axially until the large end face fits against the chassis end face of the shaft 4 to form an axial stop limit. The other end of the high-pressure elbow 10 is placed above the lathe worktable 2, naturally maintaining a vertical machining posture.

[0033] S2: Place the adjusting block 9 in the slide groove position of the lathe worktable 2, slide the T-bolt 8 to drive the adjusting block 9 to move towards the outer wall of the high-pressure elbow 10 until the adjusting block 9 fits against the outer wall of the high-pressure elbow 10, tighten the nut to lock the position of the adjusting block 9, and complete the vertical reference angle positioning of the high-pressure elbow 10.

[0034] S3: Tighten all the outer clamping bolts 6 of the cone ring 5 in sequence and evenly. Each clamping bolt 6 abuts against the inclined outer wall of the large end of the high-pressure elbow 10 along the oblique direction to form a stable radial clamping structure.

[0035] S4: Take two locking bolts 7 and pass them through the locking bolt 7 holes of the cone ring 5 respectively. Align them with the threaded holes of the chassis of the rotating shaft 4 and screw them in. Continue to tighten the locking bolts 7 and pull the cone ring 5 to fit against the chassis, so that the cone ring 5, the high-pressure elbow 10, and the rotating shaft 4 are firmly connected as a single rigid whole.

[0036] S5: Start the drilling equipment to process the vertical reference ballistic hole. After processing, loosen the T-bolt 8, operate the rotary table 1 to drive the high-pressure elbow 10 to rotate, and then adjust the lathe table surface 2 to move left and right to the corresponding position of the next set of ballistic holes. Re-tighten the T-bolt 8 to limit the position, and complete the drilling of the remaining space angle ballistic holes in sequence. After all holes are processed, loosen the locking bolt 7, clamping bolt 6, and T-bolt 8 in the reverse direction, remove the processed high-pressure elbow 10, and replace the workpiece to be processed to repeat the processing.

[0037] By setting a rotary worktable 1 on the lathe worktable 2, and combining it with a dedicated rotating shaft 4, a locking mechanism, and a limiting mechanism to form an integrated clamping and positioning structure, the traditional manual scribing and alignment method is abandoned. Instead of manual reference marking, the mechanical positioning structure significantly reduces positioning deviations caused by human measurement, improves the problem of inconsistent hole positions in batches of workpieces, reduces the risk of leakage under high pressure after workpiece assembly, and enhances the overall pressure-bearing reliability of the pipeline system. The traditional single-point simple clamping method of tooling is changed; the rotating shaft 4 provides internal hole positioning support for the large end of the high-pressure elbow 10, and the locking mechanism completes overall end locking. Simultaneously, the limiting mechanism limits the posture of the other end of the high-pressure elbow 10, effectively reducing the slight displacement of the workpiece during drill bit feeding and improving machining defects such as ballistic hole axis misalignment and angular deviation. Utilizing the rotation adjustment function of the rotary worktable 1, combined with an adjustable limiting structure, continuous positioning machining of multiple sets of ballistic holes with different spatial angles can be completed, simplifying machining processes, shortening the workflow, and effectively improving the machining efficiency of batch workpieces.

[0038] The above description is merely a preferred embodiment of the present invention and does not limit the scope of the present invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A high-pressure elbow ballistic hole positioning and clamping device, comprising a lathe, wherein a rotary worktable is provided on one side of the lathe worktable, characterized in that: A rotating shaft is clamped and fixed on the three-jaw chuck of the rotary table. The rotating shaft includes an integrally formed base and a straight section. A pair of symmetrical threaded holes are opened on the end face of the base. The straight section is a cylindrical mandrel with an outer diameter that matches the inner diameter of the large end of the high-pressure elbow. The large end of the high-pressure elbow is locked and fixed on the three-jaw chuck by a locking mechanism. A limiting mechanism for limiting the other end of the high-pressure elbow is provided on the lathe table. The locking mechanism includes a locking cone ring, multiple clamping bolts, and two locking bolts. The locking cone ring is fitted onto the outer wall of the high-pressure elbow. The locking cone ring has multiple oblique through-hole clamping threads evenly distributed along its circumference. Each threaded hole is fitted with a clamping bolt. A pair of symmetrical locking bolt holes are opened on the end face of the locking cone ring. The two locking threaded holes and the three clamping bolt holes are spatially staggered. After the locking bolts pass through the locking bolt holes of the locking cone ring, they are threadedly connected to the threaded holes of the rotating shaft base to form an axial tensioning structure. The limiting mechanism includes a T-bolt and an adjusting block. The adjusting block is placed on the lathe worktable. The T-bolt is slidably engaged in the T-groove of the lathe worktable. The shank of the T-bolt passes upward through the adjusting block and is screwed with a nut.

2. The high-pressure elbow ballistic hole positioning and clamping device according to claim 1, characterized in that: The clamping bolts that lock the outer wall of the cone ring are evenly distributed along the circumference of the cone surface. The clamping bolts penetrate the cone ring at an angle and then press against the arc-shaped outer wall of the elbow.

3. The high-pressure elbow ballistic hole positioning and clamping device according to claim 1, characterized in that: The axial tensioning structure formed by the locking bolts and the rotating shaft chassis avoids the drill bit feed path throughout the entire process.

4. The high-pressure elbow ballistic hole positioning and clamping device according to claim 1, characterized in that: The outer diameter of the straight section of the shaft is smaller than the diameter of the inner ballistic large end hole of the high-pressure elbow, and the inner diameter of the locking cone ring is larger than the outer diameter of the high-pressure elbow.

5. The method of using the high-pressure elbow ballistic hole positioning and clamping device according to any one of claims 1-4, characterized in that, Includes the following steps: S1: After the tooling is pre-installed, the locking cone ring is pre-fitted onto the outer wall of the high-pressure elbow. Hold the elbow and align it with the straight section of the shaft. Push the large end of the inner ballistic ... S2: Place the adjusting block in the slide groove of the lathe worktable, slide the T-bolt to move the adjusting block towards the outer wall of the elbow until the adjusting block fits against the outer wall of the high-pressure elbow, tighten the nut to lock the position of the adjusting block, and complete the vertical reference angle positioning of the high-pressure elbow. S3: Tighten all the clamping bolts on the outside of the cone ring in sequence and evenly. Each clamping bolt abuts against the inclined outer wall of the large end of the high-pressure elbow along the oblique direction to form a stable radial clamping structure. S4: Take two locking bolts and pass them through the locking bolt holes of the cone ring respectively. Align them with the threaded holes of the rotating shaft base and screw them in. Continue to tighten the locking bolts to pull the cone ring against the base, so that the cone ring, high-pressure elbow and rotating shaft are firmly connected as a single rigid whole. S5: Start the drilling equipment to process the vertical reference ballistic hole. After processing, loosen the T-bolt, operate the rotary table to drive the high-pressure elbow to rotate, and then adjust the lathe table to move left and right to the corresponding position of the next set of ballistic holes. Re-tighten the T-bolt limit and complete the drilling of the remaining space angle ballistic holes in sequence. After all holes are processed, loosen the locking bolt, clamping bolt, and T-bolt in the opposite direction, remove the processed high-pressure elbow, replace the workpiece to be processed, and repeat the processing.

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