Finish machining device for inner hole of common rail pipe

Abstract

The utility model relates to the technical field of machining equipment, in particular to an inner hole finish machining device of a common rail pipe, and solves the problems that in the prior art, a three-jaw chuck needs to be manually tightened one by one by an operator, clamping force is difficult to uniformly control, eccentricity of a workpiece is easily caused or the surface is easily damaged by clamping; and therefore, the coaxiality and the surface roughness of subsequent inner hole machining are influenced. A common rail pipe inner hole finish machining device comprises a bearing table, a honing mechanism and a positioning pipe, pushing structures are arranged on the two sides of the outer ring of the positioning pipe, auxiliary positioning structures are arranged on the two sides of the inner ring of the positioning pipe, each auxiliary positioning structure comprises three abutting blocks annularly arrayed in the circumferential direction, and the output ends of the pushing structures are connected with the abutting blocks. A traditional manual chuck is replaced with a multi-point synchronous clamping mode, self-centering clamping of the common rail pipe is achieved, clamping precision and stability are improved, workpiece eccentricity or surface damage is effectively avoided, coaxiality and surface smoothness of inner hole machining are remarkably improved, and the high-precision machining requirement is met.

Description

Technical Field

[0001] This utility model relates to the field of machining equipment technology, and in particular to a device for precision machining of the inner hole of a common rail pipe. Background Technology

[0002] The common rail is one of the core components of the high-pressure common rail fuel injection system in a diesel engine. Its main function is to store fuel supplied by the high-pressure fuel pump and deliver the fuel evenly and stably to the injectors in each cylinder. Because the common rail must withstand high-frequency pulsating pressure and continuous high pressure during operation, the machining accuracy of its internal channels directly affects the stability of fuel flow, sealing performance, and the reliability of the entire system. Therefore, high-precision machining of the common rail's inner bore is a key technological step to ensure its performance and service life.

[0003] Existing common rail tube internal hole machining generally uses a traditional three-jaw chuck for workpiece clamping (as disclosed in patent CN204276947U), with clamping force adjusted by manually rotating the chuck screw. While this clamping method is simple in structure and low in cost, it has significant drawbacks in practical applications: First, the three-jaw chuck requires manual tightening of each jaw individually, making it difficult to control the clamping force uniformly. This can easily lead to workpiece eccentricity or surface damage, affecting the coaxiality and surface roughness of subsequent internal hole machining. Second, due to the complex shape and thin wall thickness of common rail tubes, deformation is prone to occur during clamping, further reducing machining accuracy and consistency. Furthermore, manual clamping is time-consuming, severely impacting overall machining efficiency, and is particularly unsuitable for the demands of modern, high-volume, high-cycle production lines.

[0004] Therefore, to address the shortcomings of existing technologies, we urgently need a precision machining device for the inner bore of common rail pipes. This device should be able to ensure high-precision machining while possessing rapid clamping and multi-specification compatibility capabilities, significantly improving the consistency and production efficiency of common rail pipe inner bore machining. Simultaneously, it should reduce manual intervention, enhance equipment safety and automation, and better meet the comprehensive requirements of modern high-pressure fuel systems for high-precision, high-reliability, and efficient production of components, providing strong support for the technological upgrading of related manufacturing industries. Utility Model Content

[0005] The purpose of this invention is to provide a device for precision machining of the inner hole of a common rail pipe, which solves the problem in the prior art where the three-jaw chuck requires the operator to manually tighten each one, making it difficult to control the clamping force uniformly, which can easily lead to workpiece eccentricity or damage to the surface, thus affecting the coaxiality and surface roughness of subsequent inner hole machining.

[0006] To achieve the above objectives, this utility model provides a device for precision machining of the inner hole of a common rail pipe, comprising a support platform, a honing mechanism, and a positioning tube;

[0007] The honing mechanism is connected to one side of the top of the support platform, and the positioning tube is connected to the other side of the top of the support platform.

[0008] The outer ring of the positioning tube is provided with several pushing structures on both sides, and the inner ring of the positioning tube is provided with auxiliary positioning structures on both sides.

[0009] The auxiliary positioning structure includes three abutment blocks arranged in a circular array along the circumference of the positioning tube, and the output end of the pushing structure is connected to the adjacent abutment blocks.

[0010] The pushing structure includes a pushing cylinder, the outer ring of the positioning tube of the pushing cylinder is fixedly connected by bolts, and the output end of the pushing cylinder is connected to the side wall of the contact block.

[0011] The positioning tube has two mounting rings connected to its outer ring, and the bottom of each mounting ring is connected to a crossbar that can be detachably connected to the top of the support platform.

[0012] The bottom two abutment blocks are symmetrically arranged, and each of the bottom two abutment blocks has a rotating groove on one side. A rotating wheel is rotatably connected inside the rotating groove. A rubber pad is fixedly connected to the bottom of the top abutment block, and the side wall of the rubber pad has several anti-slip grooves.

[0013] The crossbar is fixedly connected to both sides of its bottom with positioning screws, and the ends of the positioning screws are threaded with positioning nuts. The top of the support platform has several through holes that are compatible with the positioning screws.

[0014] The mounting ring has support rods inclined on both sides of its bottom. One end of the support rod is fixedly connected to the side wall of the mounting ring, and the other end is fixedly connected to the top of the crossbar.

[0015] This utility model discloses a precision machining device for the inner hole of a common rail pipe. Through a pushing structure driving a ring-shaped array of contact blocks, it achieves multi-point synchronous clamping, overcoming the problems of traditional three-jaw chucks that require manual adjustment, have uneven clamping force, and are prone to workpiece eccentricity or damage. This improves clamping accuracy and consistency, thus ensuring the coaxiality and surface quality of the inner hole machining. The design of the auxiliary positioning structure enhances the adaptability of the clamping system, making it particularly suitable for clamping common rail pipes with complex shapes and thin walls. It effectively avoids workpiece deformation caused by uneven force during clamping, improving machining stability. Furthermore, the combination of the pushing structure and the contact blocks enables rapid clamping, significantly shortening clamping time and improving production efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0017] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model.

[0018] Figure 2 This is a structural schematic diagram of the support platform and positioning tube according to an embodiment of the present utility model.

[0019] Figure 3 This is a schematic diagram of the crossbar and support rod of an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the rotating groove and rotating wheel according to an embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the structure of the rubber pad and anti-slip groove in an embodiment of this utility model.

[0022] In the diagram: 1. Support platform; 2. Positioning tube; 3. Honing mechanism; 4. Push cylinder; 5. Mounting ring; 6. Positioning screw; 7. Crossbar; 8. Support rod; 9. Positioning nut; 10. Rotating groove; 11. Rotating wheel; 12. Abutting block; 13. Anti-slip groove; 14. Rubber pad. Detailed Implementation

[0023] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, but should not be construed as limiting the present invention.

[0024] Example 1

[0025] Please see Figure 1-5 As shown, the internal bore finishing device for a common rail pipe in this embodiment includes a support platform 1, a honing mechanism 3, and a positioning tube 2.

[0026] The honing mechanism 3 is connected to one side of the top of the support platform 1, and the positioning tube 2 is connected to the other side of the top of the support platform 1.

[0027] Several pushing structures are provided on both sides of the outer ring of the positioning tube 2, and auxiliary positioning structures are provided on both sides of the inner ring of the positioning tube 2.

[0028] The auxiliary positioning structure includes three abutment blocks 12, which are arranged in a ring along the circumference of the positioning tube 2. The output end of the pushing structure is connected to the adjacent abutment block 12.

[0029] Before the internal bore finishing, the common rail tube to be processed is first placed on the support platform 1, with one end passing through the inside of the positioning tube 2 and corresponding to the processing end of the honing mechanism 3. Then, the pushing structure set on both sides of the outer ring of the positioning tube 2 is activated. The output end of the pushing structure is connected to the adjacent abutment block 12, driving the abutment block to move synchronously along the radial direction of the positioning tube 2. Since the three abutment blocks 12 are distributed in a ring array along the circumference of the positioning tube 2, under the action of the pushing structure, the abutment blocks 12 can uniformly apply clamping force to the inner wall of the common rail tube, achieving fast and accurate self-centering clamping. At the same time, the abutment blocks 12 in the auxiliary positioning structure also play a supporting and compensating role during the clamping process, effectively preventing deformation caused by the thin wall of the common rail tube and improving clamping stability. After clamping, the honing mechanism 3 is activated and hones according to the preset parameters to remove minor surface unevenness and improve the roundness, coaxiality and surface finish of the inner bore.

[0030] Example 2

[0031] Please see Figure 1-5 As shown in this embodiment, a common rail pipe inner hole finishing device includes a pushing structure comprising a pushing cylinder 4. The outer ring of the positioning tube 2 of the pushing cylinder 4 is fixedly connected with bolts. The output end of the pushing cylinder 4 is connected to the side wall of the contact block 12. Specifically, by setting the pushing cylinder 4, the pushing cylinder 4 is fixedly connected to both sides of the outer ring of the positioning tube 2 with bolts, and its output end is connected to the side wall of the contact block 12. This design utilizes the power provided by the pushing cylinder 4 to achieve uniform clamping of the inner wall of the common rail pipe, ensuring the consistency and adjustability of the clamping force, avoiding the workpiece eccentricity or surface damage caused by uneven clamping force in the traditional manual clamping method, and improving clamping accuracy and processing quality.

[0032] The two bottom contact blocks 12 are symmetrically arranged, and each of the two bottom contact blocks 12 has a rotating groove 10 on one side. A rotating wheel 11 is rotatably connected inside the rotating groove 10. A rubber pad 14 is fixedly connected to the bottom of the top contact block 12. Several anti-slip grooves 13 are formed on the side wall of the rubber pad 14. Specifically, through the arrangement of the rotating groove 10, rotating wheel 11, rubber pad 14 and anti-slip grooves 13, a rotating groove 10 is formed on one side of the two bottom contact blocks 12, and a rotating wheel 11 is rotatably connected in it. At the same time, a rubber pad 14 with anti-slip grooves 13 is fixedly connected to the bottom of the top contact block 12. This design ensures clamping force. At the same time, it reduces wear on the surface of the common rail tube and reduces frictional resistance through the rotating wheel 11, ensuring smoothness and stability during clamping, and further improving the safety and reliability of clamping. The two rotating wheels 11 realize the rotation support at the bottom, improving the convenience of the common rail tube when it enters. After placement, the three abutment blocks 12 are brought closer together by the pushing cylinder 4 to clamp the common rail tube. When the rubber pad 14 of the top abutment block 12 contacts the top of the common rail tube, the anti-slip groove 13 can restrict the common rail tube and prevent it from rotating due to the two rotating wheels 11, ensuring the stability during processing.

[0033] Example 3

[0034] Please see Figure 1-5 As shown in this embodiment, a common rail pipe inner hole finishing device has two mounting rings 5 ​​connected to the outer ring of the positioning pipe 2. The bottom of the mounting ring 5 is connected to a crossbar 7 that is detachably connected to the top of the support platform 1. Specifically, by setting the mounting rings 5 ​​and the crossbar 7, two mounting rings 5 ​​are connected to the outer ring of the positioning pipe 2, and the bottom of each mounting ring 5 is connected to a crossbar 7 that is detachably connected to the top of the support platform 1. This structure not only enhances the connection stability between the positioning pipe 2 and the support platform 1, but also facilitates quick disassembly and maintenance, improves the flexibility and adaptability of the equipment, and makes it easy to switch between processing common rail pipes of different specifications.

[0035] Positioning screws 6 are fixedly connected to both sides of the bottom of the crossbar 7. Positioning nuts 9 are threaded to the ends of the positioning screws 6. Several through holes adapted to the positioning screws 6 are opened on the top of the support platform 1. Specifically, by setting the positioning screws 6 and positioning nuts 9, positioning screws 6 are fixedly connected to both sides of the bottom of the crossbar 7, and the positioning nuts 9 are threaded to the through holes opened on the top of the support platform 1. This design realizes a stable connection between the crossbar 7 and the support platform 1, prevents loosening or displacement caused by vibration, enhances the stability and vibration resistance of the overall structure, and ensures the smooth and reliable operation of the equipment.

[0036] Support rods 8 are inclinedly installed on both sides of the bottom of the mounting ring 5. One end of the support rod 8 is fixedly connected to the side wall of the mounting ring 5, and the other end is fixedly connected to the top of the crossbar 7. Specifically, through the design of the support rods 8, support rods 8 are inclinedly installed on both sides of the bottom of the mounting ring 5. One end is fixedly connected to the side wall of the mounting ring 5, and the other end is fixedly connected to the top of the crossbar 7. This triangular support structure increases the mechanical strength and stability between the positioning tube 2 and the crossbar 7, effectively disperses the stress generated during operation, prevents structural deformation or damage caused by excessive local stress, and ensures the long-term efficient operation of the equipment.

[0037] This solution includes the following workflow:

[0038] Before performing internal precision machining, the operator places the common rail tube to be machined on the support platform 1, ensuring that one end passes through the interior of the positioning tube 2 and aligns with the machining end of the honing mechanism 3. Then, the pushing structure is activated. This pushing structure consists of pushing cylinders 4 positioned on both sides of the outer ring of the positioning tube 2. The pushing cylinders 4 are bolted to the positioning tube 2, and their output ends are connected to the sidewalls of adjacent contact blocks 12, driving the contact blocks to move synchronously along the radial direction of the positioning tube 2. Since the three contact blocks 12 are arranged in a circular array along the circumference of the positioning tube 2, under the action of the pushing cylinders 4, the contact blocks 12 can uniformly apply clamping force to the inner wall of the common rail tube, achieving rapid and precise self-centering clamping. The two bottom contact blocks 12 are symmetrically arranged, and a rotating groove 10 is provided on one side. A rotating wheel 11 is rotatably connected inside the rotating groove 10, facilitating the sliding of the common rail tube during insertion. The top contact block 12 is fixedly connected to a rubber pad 14 at its bottom. The side wall of the rubber pad 14 has several anti-slip grooves 13 to enhance clamping stability and prevent workpiece rotation. After clamping, the honing mechanism 3 starts and performs honing according to preset parameters to remove minor surface imperfections and improve the roundness, coaxiality, and surface finish of the inner hole. At the same time, the positioning tube 2 is connected to the crossbar 7 through the mounting ring 5. The bottom of the mounting ring 5 is connected to two crossbars 7. The bottom sides of the crossbars 7 are fixedly connected to positioning screws 6, which are threaded into the through holes on the top of the support platform 1 through positioning nuts 9 to achieve a stable connection. In addition, the bottom sides of the mounting ring 5 are also inclined with support rods 8. One end of the support rod 8 is fixedly connected to the side wall of the mounting ring 5, and the other end is fixedly connected to the top of the crossbar 7 to form a triangular support structure, which further enhances the overall mechanical strength and stability.

[0039] The detailed benefits of this device are as follows: By driving the cylinder 4 to move the ring-shaped array of contact blocks 12, multi-point synchronous clamping is achieved, which changes the problems of traditional three-jaw chucks that require manual adjustment, have uneven clamping force, and are prone to workpiece eccentricity or damage. This improves clamping accuracy and consistency, thereby ensuring the coaxiality and surface quality of the inner hole machining. The rotating wheel 11 in the auxiliary positioning structure is used in combination with the rubber pad 14. During the clamping process, it not only reduces the wear on the surface of the common rail tube, but also enhances the clamping stability through the anti-slip groove 13, preventing the workpiece from rotating during the machining process and improving machining safety. The combined design of the mounting ring 5, crossbar 7, positioning screw 6 and positioning nut 9 enhances the connection strength and vibration resistance between the positioning tube 2 and the bearing platform 1, ensuring stable and reliable equipment operation and avoiding loosening or displacement caused by vibration. The support rod 8, as a reinforcing structure, effectively disperses working stress, prevents excessive local stress from causing structural deformation or damage, and improves the durability and long-term operational stability of the equipment.

[0040] The above-disclosed embodiments are merely one or more preferred embodiments of this application and should not be construed as limiting the scope of this application. Those skilled in the art can understand that all or part of the processes for implementing the above embodiments and equivalent changes made in accordance with the claims of this application still fall within the scope of this application.

Claims

1. A device for precision machining of the inner bore of a common rail pipe, characterized in that, include: Support platform, honing mechanism and positioning tube; The honing mechanism is connected to one side of the top of the support platform, and the positioning tube is connected to the other side of the top of the support platform. The outer ring of the positioning tube is provided with several pushing structures on both sides, and the inner ring of the positioning tube is provided with auxiliary positioning structures on both sides. The auxiliary positioning structure includes three abutment blocks arranged in a circular array along the circumference of the positioning tube, and the output end of the pushing structure is connected to the adjacent abutment blocks.

2. The internal bore finishing device for a common rail pipe according to claim 1, characterized in that, The pushing structure includes a pushing cylinder, the outer ring of the positioning tube of the pushing cylinder is fixedly connected by bolts, and the output end of the pushing cylinder is connected to the side wall of the contact block.

3. The device for precision machining of the inner hole of a common rail pipe according to claim 1, characterized in that, The outer ring of the positioning tube is connected to two mounting rings, and the bottom of the mounting rings is connected to a crossbar that can be detachably connected to the top of the support platform.

4. The internal bore finishing device for a common rail pipe according to claim 2, characterized in that, The two bottom abutment blocks are arranged symmetrically to each other, and each of the two bottom abutment blocks has a rotating groove on one side. A rotating wheel is rotatably connected inside the rotating groove. A rubber pad is fixedly connected to the bottom of the top abutment block, and several anti-slip grooves are opened on the side wall of the rubber pad.

5. The internal bore finishing apparatus for a common rail pipe according to claim 3, characterized in that, Positioning screws are fixedly connected to both sides of the bottom of the crossbar, and positioning nuts are threaded to the ends of the positioning screws. Several through holes that are compatible with the positioning screws are opened on the top of the support platform.

6. The internal bore finishing apparatus for a common rail pipe according to claim 5, characterized in that, The mounting ring has support rods inclined on both sides of its bottom. One end of the support rod is fixedly connected to the side wall of the mounting ring, and the other end is fixedly connected to the top of the crossbar.

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