A dual-station machining fixture for engine water pump sealing cover

Abstract

This utility model relates to the field of automotive parts manufacturing and discloses a dual-station machining fixture for engine water pump sealing covers. It includes a worktable, an indexing turntable, and two sets of fixture structures arranged on the worktable to form a dual-station configuration. Each fixture structure includes a round pin positioning structure for positioning the first hole of the engine water pump sealing cover, a diamond pin positioning structure for positioning the second hole of the engine water pump sealing cover, a fixing pin positioning structure for positioning the third hole of the engine water pump sealing cover, a support cylinder for supporting the fourth hole of the engine water pump sealing cover, and multiple clamping devices. The dual-station design allows two engine water pump sealing covers to be positioned, clamped, and machined simultaneously. Combined with the one-time flipping of the indexing turntable, it enables continuous processing of two operations, reducing process intervals and equipment adjustments, improving processing efficiency, and adapting to the needs of mass production.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts manufacturing, and in particular to a dual-station machining fixture for an engine water pump sealing cover. Background Technology

[0002] As a critical component of the engine cooling system, the engine water pump seal cover's structural precision directly affects the water pump's sealing performance and operational reliability. After being die-cast, the water pump seal cover requires precision machining of its key components to meet assembly and usage requirements. See [link / reference]. Figure 4 As shown, the inner holes 103 of the first cylinder 101 and the second cylinder 102 arranged side by side on the engine water pump sealing cover 10 need to be precision machined to ensure dimensional accuracy and surface finish. At the same time, a through hole 104 that connects to the interior of the first cylinder 101 and penetrates the first cylinder 101 and the second cylinder 102 needs to be machined in the cylinder body. The axis of the through hole 104 is perpendicular to the axis of the two cylinders. Its positional accuracy and hole diameter accuracy are crucial to the flow efficiency and sealing performance of the coolant.

[0003] In existing machining processes, the above-mentioned machining steps usually need to be completed in conjunction with CNC machine tools. However, since the machining involves internal hole finishing and vertical perforation, the process is relatively complex. Currently, a machining method of multiple clamping operations on separate equipment and at separate workstations is often adopted. For example, the sealing cover is first positioned on a CNC machine tool using a special fixture to complete the internal hole finishing of the first and second cylinders; then the fixture is changed or the machine tool is transferred to another CNC machine tool, repositioned, and the perforation is machined.

[0004] This processing method is incompatible with the high efficiency and precision characteristics of CNC machine tools, and has many problems: On the one hand, multiple clamping will lead to inconsistent positioning references, which will easily generate cumulative errors and affect the processing accuracy of the sealing cover. In particular, it is difficult to ensure the perpendicularity requirement between the perforation and the inner hole of the two cylinders, making it difficult to give full play to the high precision advantage of CNC machine tools; on the other hand, the dispersed process results in low utilization of CNC machine tools, long clamping and adjustment time, low production efficiency, and inability to meet the needs of mass production.

[0005] It is evident that existing technologies still need improvement and enhancement. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a dual-station machining fixture for engine water pump sealing covers, which aims to improve machining accuracy and production efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A dual-station machining fixture for an engine water pump sealing cover includes a laterally extending worktable, an indexing turntable for driving the worktable to rotate, and two sets of fixture structures arranged on the worktable to form a dual-station setup. Each set of fixture structures includes a round pin positioning structure for positioning a first hole of the engine water pump sealing cover, a diamond pin positioning structure for positioning a second hole of the engine water pump sealing cover, a fixing pin positioning structure for positioning a third hole of the engine water pump sealing cover, and a support cylinder for supporting a fourth hole of the engine water pump sealing cover. The worktable is provided with multiple clamping devices that are respectively positioned corresponding to the first, second, third, and fourth holes of the engine water pump sealing cover and press the engine water pump sealing cover downwards.

[0009] As a further improvement to the above technical solution, the circular pin positioning structure includes a first base fixed on the workbench, an elastic circular pin vertically telescopically disposed on the first base, and a first spring for providing elastic force to the bottom of the elastic circular pin.

[0010] As a further improvement to the above technical solution, the top of the elastic circular pin is truncated conical.

[0011] As a further improvement to the above technical solution, the diamond pin positioning structure includes a second base fixed on the workbench, an elastic diamond pin vertically telescopically mounted on the second base, and a second spring for providing elastic force to the bottom of the elastic diamond pin.

[0012] As a further improvement to the above technical solution, a first guide auxiliary block is provided at the fifth hole of the engine water pump sealing cover. The first guide auxiliary block has a C-shaped opening on the side facing the engine water pump sealing cover, and the upper edge of the C-shaped opening has a chamfer.

[0013] As a further improvement to the above technical solution, a second guide auxiliary block is provided at the position opposite to the fifth hole of the engine water pump sealing cover. The side of the second guide auxiliary block facing the engine water pump sealing cover forms an arc surface, and the upper edge of the arc surface is chamfered.

[0014] As a further improvement to the above technical solution, the workbench is provided with a water spray head for cleaning the round pin positioning structure, the fixed pin positioning structure and the diamond pin positioning structure.

[0015] As a further improvement to the above technical solution, the workbench has a drain outlet located below the engine water pump sealing cover.

[0016] As a further improvement to the above technical solution, the cylinder body of the support cylinder is located inside the drain outlet, and a mounting base is provided at the bottom of the workbench, with the support cylinder mounted on the mounting base.

[0017] As a further improvement to the above technical solution, the clamping device is a lever clamping cylinder.

[0018] The beneficial effects of this utility model are as follows: The dual-station machining fixture for engine water pump sealing covers provided by this utility model allows two engine water pump sealing covers to be positioned, clamped, and machined simultaneously. Combined with the one-time flipping of the indexing turntable, it enables continuous processing of two processes, reducing process intervals and equipment adjustments. The output per unit time is more than doubled compared to single-station processing, making it suitable for mass production needs. The precise 90° flipping of the indexing turntable enables the process conversion between inner hole finishing and perforation, avoiding datum offset caused by secondary clamping of the workpiece. This ensures key dimensional and positional tolerances such as the perpendicularity of the perforation to the inner holes of the two cylinders, significantly improving machining accuracy compared to traditional multiple clamping methods. The combination of round pins, diamond pins, and fixed pins for positioning, along with a multi-point clamping device, ensures that the two engine water pump sealing covers do not loosen or shift during flipping and machining. The auxiliary support of the support cylinder further enhances the vertical stability of the workpiece, reduces vibration interference during machining, and reduces the scrap rate. Attached Figure Description

[0019] Figure 1 A perspective view of the engine water pump sealing cover after being clamped by the dual-station machining fixture provided by this utility model.

[0020] Figure 2 Schematic diagram of the structure of a dual-station machining fixture for an engine water pump sealing cover Figure 1 .

[0021] Figure 3 Schematic diagram of the structure of a dual-station machining fixture for an engine water pump sealing cover Figure 2 .

[0022] Figure 4 A 3D view of the engine water pump sealing cover.

[0023] Explanation of main component symbols: 1-Workbench, 11-Drain outlet, 12-Mounting base, 2-Indexing turntable, 3-Clamping structure, 4-Round pin positioning structure, 41-First seat, 42-Elastic round pin, 5-Rhomboid pin positioning structure, 51-Second seat, 52-Elastic rhomboid pin, 6-Fixed pin positioning structure, 61-Third seat, 62-Fixed pin, 7-Support cylinder, 8-Pressure clamp, 91-First guide auxiliary block, 911-C-shaped opening, 92-Second guide auxiliary block, 921-Arc surface, 93-Water spray nozzle, 10-Engine water pump sealing cover, 101-First cylinder, 102-Second cylinder, 103-Inner hole, 104-Through hole, 105-First hole, 106-Second hole, 107-Third hole, 108-Fourth hole, 109-Fifth hole. Detailed Implementation

[0024] This utility model provides a dual-station machining fixture for an engine water pump sealing cover. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes the utility model in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit the scope of protection of this utility model.

[0025] Please see Figures 1 to 4 This utility model provides a dual-station machining fixture for an engine water pump sealing cover, including a laterally extending worktable 1, an indexing turntable 2 for driving the worktable 1 to rotate, and two sets of fixture structures 3 arranged on the worktable 1 to form a dual-station. Each set of fixture structures 3 includes a round pin positioning structure 4 for positioning the first hole 105 of the engine water pump sealing cover 10, a diamond pin positioning structure 5 for positioning the second hole 106 of the engine water pump sealing cover 10, a fixing pin positioning structure 6 for positioning the third hole 107 of the engine water pump sealing cover 10, and a support cylinder 7 for supporting the fourth hole 108 of the engine water pump sealing cover 10. The worktable 1 is provided with a plurality of clamping devices 8 that are respectively set corresponding to the first hole 105, second hole 106, third hole 107, and fourth hole 108 of the engine water pump sealing cover 10 and press down on the engine water pump sealing cover 10.

[0026] The operator places two engine water pump sealing covers 10 to be processed onto two sets of clamping structures 3. In each set of clamps, the round pin positioning structure 4 engages with the first hole 105 of the sealing cover, the diamond pin positioning structure 5 engages with the second hole 106, and the fixed pin positioning structure 6 engages with the third hole 107, forming a three-point positioning to restrict the horizontal degree of freedom; the support cylinder 7 supports the fourth hole 108 to ensure vertical stability. Subsequently, the clamping devices 8 corresponding to each hole move downwards synchronously, firmly pressing the two sealing covers onto the worktable 1.

[0027] At this point, the worktable 1 is in the initial machining position. The CNC machine tool's cutting tool performs simultaneous finishing on the inner holes 103 of the first cylinder 101 and the second cylinder 102 of the two engine water pump sealing covers 10, ensuring the dimensional accuracy and surface finish of the inner holes 103. After the inner holes 103 are machined, the indexing rotary table 2 drives the worktable 1 to rotate 90°, so that the cylinder bodies of the first cylinders 101 of the two engine water pump sealing covers 10 are in the corresponding positions for the machining of the perforation 104, and the axis of the perforation 104 is consistent with the machining direction of the CNC machine tool's cutting tool.

[0028] The CNC machine tool's cutting tool synchronously processes the first cylinder 101 body of the two engine water pump sealing covers 10, completing the processing of the through hole 104 that connects the inside of the first cylinder 101 and penetrates the first and second cylinders 102 in one go, ensuring the perpendicularity requirement of the through hole 104 to the axis of the two cylinders.

[0029] This utility model provides a dual-station machining fixture for engine water pump sealing covers 10. The dual-station design allows two engine water pump sealing covers 10 to be positioned, clamped, and machined simultaneously. Combined with the one-time flipping of the indexing turntable 2, it enables continuous machining of two processes, reducing process intervals and equipment adjustments. The output per unit time is more than doubled compared to single-station machining, making it suitable for mass production needs. The indexing turntable 2 precisely flips 90° to achieve the process conversion between the finishing of the inner hole 103 and the machining of the through hole 104, avoiding datum offset caused by secondary clamping of the workpiece. This ensures key dimensional and positional tolerances such as the perpendicularity of the through hole 104 to the inner holes 103 of the two cylinders, significantly improving machining accuracy compared to traditional multiple clamping methods. The combination of round pins, diamond pins, and fixing pins 62, along with the multi-point clamping device 8, ensures that the two engine water pump sealing covers 10 do not loosen or shift during flipping and machining. The auxiliary support of the support cylinder 7 further enhances the vertical stability of the workpiece, reduces vibration interference during machining, and reduces the scrap rate.

[0030] Specifically, the circular pin positioning structure 4 includes a first base 41 fixed on the worktable 1, an elastic circular pin 42 vertically telescopically mounted on the first base 41, and a first spring providing elastic force to the bottom of the elastic circular pin 42. The elastic circular pin 42 achieves vertical telescopic movement through the elastic force provided by the first spring. When clamping the engine water pump sealing cover 10, if there is a slight misalignment between the first hole 105 of the engine water pump sealing cover 10 and the elastic circular pin 42, the elastic circular pin 42 will be compressed and contracted, reducing hard collisions and scratches with the edge of the hole. This effectively avoids problems such as chipping and scratches at the edge of the hole that may occur with traditional rigid circular pin positioning, protecting the integrity of the workpiece's positioning reference and ensuring that subsequent processing accuracy is not affected by initial damage to the workpiece.

[0031] The first spring provides a continuous and stable elastic force to the bottom of the elastic pin 42, ensuring that the elastic pin 42 always fits tightly against the inner wall of the first hole 105 of the sealing cap. Even if there are minor dimensional tolerances or shape deviations in the first hole 105 of the sealing cap, the elastic pin 42 can adaptively adjust its position under the action of the elastic force, ensuring a reliable fit with the hole. At the same time, the elastic force parameters of the first spring of the elastic pin 42 in the two sets of fixture structures 3 are uniform, ensuring that the positioning tightness of the two sealing caps at the first hole 105 is consistent, further improving the positioning consistency during dual-station machining.

[0032] Furthermore, the top of the elastic pin 42 is truncated cone-shaped. The truncated cone-shaped top has an inclined guide surface. When the first hole 105 of the engine water pump sealing cover 10 is aligned with the elastic pin 42 for clamping, even if there is a certain positional deviation between the hole and the elastic pin 42, the edge of the hole will slide along the inclined surface of the truncated cone, thereby automatically guiding the hole and the elastic pin 42 to be precisely aligned. This greatly reduces the difficulty of manual alignment and makes the clamping process smoother and more efficient.

[0033] Specifically, the diamond pin positioning structure 5 includes a second base 51 fixed on the worktable 1, an elastic diamond pin 52 vertically telescopically mounted on the second base 51, and a second spring providing elastic force to the bottom of the elastic diamond pin 52. The diamond pin positioning structure 5 engages with the second hole 106 of the engine water pump sealing cover 10 via the elastic diamond pin 52. The special shape of the diamond pin effectively restricts the rotational freedom of the engine water pump sealing cover 10, ensuring that the engine water pump sealing cover 10 will not rotate around the positioning center during processing, thus providing reliable assurance for the perpendicularity of the through hole 104 to the axes of the two cylinders. Simultaneously, the elastic diamond pin 52, in conjunction with the second spring, achieves vertical telescopic movement, accommodating minor dimensional errors in the second hole 106 caused by die casting or previous processing, avoiding damage to the hole or diamond pin due to rigid contact, and improving positioning compatibility while ensuring anti-rotation accuracy.

[0034] Specifically, the fixing pin positioning structure 6 includes a third seat 61 and a fixing pin 62 integrally formed with the third seat 61, avoiding the positioning loosening problem caused by assembly gaps in the split structure. This integral structure can provide rigid support for the third hole 107 of the engine water pump sealing cover 10, ensuring that the fixing pin 62 will not undergo slight displacement due to vibration or force during processing, thereby ensuring the stability of the positioning reference of the sealing cover and providing a solid foundation for the precision of the inner hole 103 and the through hole 104 machining.

[0035] In a preferred embodiment, a first guide block 91 is provided at the fifth hole 109 of the engine water pump sealing cover 10. The first guide block 91 has a C-shaped opening 911 on the side facing the engine water pump sealing cover 10. The C-shaped opening 911 can fit snugly with the corresponding part of the sealing cover, providing an additional guiding reference for the placement of the engine water pump sealing cover 10. When the operator places the engine water pump sealing cover 10, the C-shaped opening can assist in calibrating the horizontal position of the sealing cover. Combined with positioning structures such as round pins and diamond pins, it further reduces positioning deviation, ensures that the sealing cover quickly falls into the accurate clamping position, and improves positioning accuracy.

[0036] The upper edge of the C-shaped opening is chamfered, forming an inclined transition surface. During the lowering process of the engine water pump sealing cover 10, even if there is a certain alignment deviation between the engine water pump sealing cover 10 and the C-shaped opening, the chamfer can guide the engine water pump sealing cover 10 to slide into the C-shaped opening along the inclined surface, avoiding clamping jamming caused by hard impact. This design significantly reduces the alignment requirements during manual operation, reduces the number of clamping adjustments, and allows operators to complete the initial placement of the sealing cover more quickly and easily, improving clamping efficiency.

[0037] Furthermore, a second guide block 92 is provided on the engine water pump sealing cover 10 at a position opposite to the fifth hole 109. The side of the second guide block 92 facing the engine water pump sealing cover 10 forms an arc surface 921. The second guide block 92 and the first guide block 91 form a symmetrically distributed bidirectional guide structure. When the sealing cover is placed, the guide blocks on both sides limit and guide it from different directions, preventing the engine water pump sealing cover 10 from tilting or shifting due to unilateral force during clamping. This significantly improves the overall positioning stability of the engine water pump sealing cover 10 and lays a more solid foundation for the accuracy of subsequent processing.

[0038] Furthermore, the upper edge of the arc surface 921 is chamfered, forming a 360-degree guiding transition during the lowering of the engine water pump sealing cover 10. Even if the engine water pump sealing cover 10 experiences a large positional deviation during placement, the chamfers on both sides can work together to guide the sealing cover along a smooth path into the correct position, avoiding jamming or collision caused by insufficient guidance on one side, further reducing the difficulty of manual clamping and making the clamping process smoother and more efficient.

[0039] During the machining of the engine water pump sealing cover 10, impurities such as metal shavings and cutting fluid residue are generated. If these impurities adhere to the surfaces or mating gaps of the round pin positioning structure 4, the fixed pin positioning structure 6, and the diamond pin positioning structure 5, they will affect the precise fit between the positioning components and the sealing cover holes. Therefore, the worktable 1 is equipped with a water spray nozzle 93 for cleaning the round pin positioning structure 4, the fixed pin positioning structure 6, and the diamond pin positioning structure 5. The water spray nozzle 93 can promptly rinse these positioning structures, remove impurities, avoid positioning deviations caused by impurities, ensure that each positioning structure maintains a high-precision positioning effect, and guarantee the stability of the machining process.

[0040] Furthermore, a drain outlet 11 is provided below the engine water pump sealing cover 10 on the worktable 1. The drain outlet 11 removes some material from the corresponding position on the worktable 1, effectively reducing its overall weight. This reduces the driving force required for the indexing turntable 2 to rotate the worktable 1, decreasing the load on the indexing turntable 2, improving the speed of workstation switching, and extending the service life of the indexing turntable 2. On the other hand, it quickly drains wastewater containing metal shavings and cutting fluid residue generated when the water spray nozzle 93 cleans the positioning structure, preventing wastewater from accumulating on the worktable 1.

[0041] Further details can be found here. Figure 2 and Figure 3 As shown, the cylinder body of the support cylinder 7 is located inside the drain outlet 11, making full use of the unused space of the drain outlet 11 and avoiding the support cylinder 7 occupying additional space on the surface of the workbench 1, making the fixture structure 3 more compact. A mounting base 12 is provided at the bottom of the workbench 1, and the support cylinder 7 is mounted on the mounting base 12. The mounting base 12 provides a stable mounting foundation for the support cylinder 7, enabling it to withstand greater processing impact without easily shaking when supporting the fourth hole 108 of the engine water pump sealing cover 10. Compared to directly mounting the support cylinder 7 on the surface of the workbench 1, this bottom-fixed method reduces the stress deformation of the support cylinder 7, ensuring uniform and stable support force on the fourth hole 108. Furthermore, in conjunction with positioning structures such as round pins and diamond pins, it improves the overall positioning accuracy.

[0042] Preferably, the clamping device 8 is a lever clamping cylinder. The lever clamping cylinder uses hydraulic power as its power source. Compared to pneumatically driven cylinders, it can output a greater clamping force, and the force value of hydraulic transmission is more stable and less affected by external pressure fluctuations. During the machining of the engine water pump sealing cover 10, especially when precision machining the inner holes 103 of the first cylinder 101 and the second cylinder 102, and machining through-holes, sufficient clamping force is required to prevent the workpiece from shifting or vibrating under the cutting force of the tool. The lever clamping cylinder can accurately provide the required high-strength clamping force, ensuring that the machining accuracy is not affected by workpiece loosening.

[0043] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0044] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] It is understood that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of this utility model, and all such substitutions or changes should fall within the protection scope of this utility model.

Claims

1. A dual-station machining fixture for an engine water pump sealing cover, characterized in that, The device includes a laterally extending worktable, an indexing turntable for driving the worktable to rotate, and two sets of fixture structures set on the worktable to form a dual-station configuration. Each set of fixture structures includes a round pin positioning structure for positioning the first hole of the engine water pump sealing cover, a diamond pin positioning structure for positioning the second hole of the engine water pump sealing cover, a fixing pin positioning structure for positioning the third hole of the engine water pump sealing cover, and a support cylinder for supporting the fourth hole of the engine water pump sealing cover. The worktable is provided with multiple clamping devices that are respectively set corresponding to the first, second, third, and fourth holes of the engine water pump sealing cover and press down on the engine water pump sealing cover.

2. The dual-station machining fixture for the engine water pump sealing cover according to claim 1, characterized in that, The pin positioning structure includes a first base fixed to the workbench, an elastic pin vertically telescopically mounted on the first base, and a first spring for providing elastic force to the bottom of the elastic pin.

3. The dual-station machining fixture for the engine water pump sealing cover according to claim 2, characterized in that, The top of the elastic pin is truncated cone-shaped.

4. The dual-station machining fixture for the engine water pump sealing cover according to claim 1, characterized in that, The diamond pin positioning structure includes a second base fixed to the workbench, an elastic diamond pin vertically telescopically mounted on the second base, and a second spring for providing elastic force to the bottom of the elastic diamond pin.

5. The dual-station machining fixture for the engine water pump sealing cover according to claim 1, characterized in that, The engine water pump sealing cover has a first guide block at the fifth hole. The first guide block has a C-shaped opening on the side facing the engine water pump sealing cover, and the upper edge of the C-shaped opening has a chamfer.

6. The dual-station machining fixture for the engine water pump sealing cover according to claim 5, characterized in that, The engine water pump sealing cover is provided with a second guide auxiliary block at a position away from the fifth hole. The side of the second guide auxiliary block facing the engine water pump sealing cover forms an arc surface, and the upper edge of the arc surface is chamfered.

7. The dual-station machining fixture for the engine water pump sealing cover according to claim 1, characterized in that, The workbench is equipped with a water spray nozzle for cleaning the round pin positioning structure, the fixed pin positioning structure, and the diamond pin positioning structure.

8. The dual-station machining fixture for the engine water pump sealing cover according to claim 7, characterized in that, The workbench has a drain outlet located below the engine water pump sealing cover.

9. The dual-station machining fixture for the engine water pump sealing cover according to claim 8, characterized in that, The cylinder body of the support cylinder is located inside the drain outlet, and a mounting base is provided at the bottom of the workbench, on which the support cylinder is mounted.

10. The dual-station machining fixture for the engine water pump sealing cover according to any one of claims 1-9, characterized in that, The clamping device is a lever-operated clamping cylinder.

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