Combined tool for processing crank throw hot charging hole of large marine engine
By using a combination of tooling limiting mechanism and fulcrum adjustment mechanism, the problem of workpiece position offset during the machining of hot mounting holes for large marine engine crankshafts was solved, enabling stable machining and efficient production on a floor-type boring and milling machine, and reducing costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HENGLI ENGINE (DALIAN) CO LTD
- Filing Date
- 2025-06-18
- Publication Date
- 2026-05-19
AI Technical Summary
In the machining of large marine engine crankshafts, the conventional clamping method causes the workpiece position to shift during the hot-fitting hole machining process, resulting in defective products. Existing equipment cannot meet production requirements.
The tooling is modular, including a horizontal limit mechanism, a V-shaped tooling, a vertical limit mechanism, shims, and a fulcrum adjustment mechanism. It is bolted to the boring machine worktable to fix the crank pin and crank arm, prevent the workpiece from moving, and adapt to the clamping requirements of different models.
It enables stable machining on floor-type boring and milling machines, reduces production costs, improves product quality and efficiency, avoids workpiece position deviation, and adapts to the clamping requirements of crankshafts of various engine models.
Smart Images
Figure CN224254798U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of machining technology for crankshafts of large marine engines, and in particular to a combined tooling for machining hot mounting holes of crankshafts of large marine engines. Background Technology
[0002] In the machining of large marine engine crankshafts, the hot fitting holes of the crankshafts are generally machined using gantry milling machines. Due to the increased production volume in the workshop, the original equipment could not meet the production needs. Therefore, floor-type boring and milling machines in the workshop were used to machine the hot fitting holes. During the machining process, it was found that the ordinary clamping method on the floor-type boring and milling machine caused the workpiece position to shift during the machining process due to different product models, which easily resulted in defective products. Utility Model Content
[0003] To address the aforementioned technical problems, a combined tooling for machining hot-mounted holes in large marine engine crankshafts is provided. The technical means employed in this invention are as follows:
[0004] A combined tooling for machining hot mounting holes in a large marine engine crankshaft includes two integrally forged crank arms and a crank pin connecting the two crank arms. The combined tooling includes a horizontal limiting mechanism, a V-shaped tooling, a vertical limiting mechanism, a shim, and a fulcrum adjustment mechanism. The bottoms of the horizontal limiting mechanism, the V-shaped tooling, the vertical limiting mechanism, the shim, and the fulcrum adjustment mechanism are all detachably connected to the worktable of a boring machine. The V-shaped tooling supports the crank pin, and the shim supports the crank arms. One end of the horizontal limiting mechanism is parallel to one of the crank arms closest to it, and a limiting component is provided on it. The vertical limiting mechanism is located between the two crank arms, with one end pressing against the top of the crank arm and the other end connected to the worktable of the boring machine. The fulcrum adjustment mechanism is located between the ends of the two crank arms and has adjustable fulcrums that abut against the two crank arms respectively.
[0005] Furthermore, the boring machine worktable is provided with several T-slots on which T-shaped sliders can be slidably connected. The T-shaped sliders are provided with screw holes. The horizontal limiting mechanism, V-shaped tooling, vertical limiting mechanism, shims and fulcrum adjustment mechanism are also provided with screw holes. In the working state, the horizontal limiting mechanism, V-shaped tooling, vertical limiting mechanism, shims and fulcrum adjustment mechanism are positioned relative to the T-shaped sliders and the boring machine worktable by bolts.
[0006] Furthermore, the V-shaped tooling includes a V-shaped tooling body and a bottom ear plate. A V-shaped groove is formed on the V-shaped tooling body, and the bottom ear plate is disposed on the bottom periphery of the V-shaped tooling body, with screw holes provided on the bottom ear plate.
[0007] Furthermore, the V-groove includes two inclined sections on the left and right and a horizontal section connecting the two inclined sections. Gaskets are detachably connected to both inclined sections, and the specifications of the gaskets are adapted to their corresponding inclined sections.
[0008] Furthermore, the fulcrum adjustment mechanism includes a mounting base plate, a vertical support rod, and adjustable bolts disposed on the vertical support rod. The vertical support rod has horizontally arranged screw holes and a preset thickness, so that the adjustable bolts on the left and right sides of the vertical support rod will not contact each other even when they are at their closest limit positions. The adjustable bolts are threaded, and the side of the adjustable bolt closest to the crank arm is flat. Nuts are disposed on both sides of the vertical support rod.
[0009] Furthermore, the vertical limiting mechanism includes a pressure plate, a screw, a washer, and a fastening nut. One end of the screw is connected to the pressure plate, and the other end can be connected to a T-shaped slider on the boring machine worktable. The pressure plate has a preset length so that it can press against the top of the two crank arms. The screw position is fixed by installing the fastening nut and washer.
[0010] Furthermore, the horizontal limiting mechanism includes a right-angle plate with holes, which includes a vertical plate and a horizontal plate. The horizontal plate is provided with screw holes, and the vertical plate is provided with several T-slots on which T-shaped sliders can be slidably connected. The adjustable fulcrum is specifically a support rod, which is connected to the T-shaped slider. The position of the support rod is limited by bolts passing through the screw holes around the periphery of the support rod and the screw holes of the T-shaped slider.
[0011] Furthermore, inclined reinforcing ribs are provided at the connection between the vertical and horizontal plates.
[0012] This invention has the following advantages: The V-shaped fixture secures the crank pin, preventing it from moving in the X direction and affecting machining. Adjustable pads are placed at the bottom of the crank arms to adjust the clamping height. A fulcrum adjustment mechanism is placed between the crank arms to prevent the workpiece from moving in the Z direction when the machine tool advances during machining. The workpiece is further secured by horizontal and vertical limiting mechanisms. The horizontal limiting mechanism, V-shaped fixture, vertical limiting mechanism, pads, and fulcrum adjustment mechanism in the fixture are all adjustable, meeting the requirements for crankshaft clamping of various engine models. Attached Figure Description
[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0014] Figure 1 This is an exploded view of the structure of this utility model.
[0015] Figure 2 This is a schematic diagram of the structure after clamping.
[0016] Figure 3 for Figure 2 The main view.
[0017] Figure 4 for Figure 2 The left view.
[0018] Figure 5 for Figure 2 Top view.
[0019] In the diagram: 1. Shim; 2. V-shaped fixture; 3. Boring machine worktable; 4. T-shaped slider; 5. Bolt; 6. Mounting base plate; 7. Crank arm; 8. Screw; 9. Pressure plate; 10. Shim; 11. Fastening nut; 12. Adjustable bolt; 13. Right angle plate with hole; 14. Shim. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0021] like Figures 1-5 As shown in the figure, this utility model embodiment discloses a combined tooling for machining hot mounting holes of a large marine engine crankshaft. The engine crankshaft includes two integrally forged crank arms 7 and a crank pin connecting the two crank arms. The combined tooling includes a horizontal limiting mechanism, a V-shaped tooling 2, a vertical limiting mechanism, a shim 14, and a fulcrum adjustment mechanism. The bottoms of the horizontal limiting mechanism, the V-shaped tooling, the vertical limiting mechanism, the shim, and the fulcrum adjustment mechanism are all detachably connected to the boring machine worktable 3. The V-shaped tooling is used to support the crank pin, and the shim is used to support the crank arms. One end of the horizontal limiting mechanism is arranged parallel to one of the crank arms nearby, and a limiting component is provided on it. The vertical limiting mechanism is located between the two crank arms, with one end pressing against the top of the crank arm and the other end connected to the boring machine worktable. The fulcrum adjustment mechanism is located between the ends of the two crank arms, and adjustable fulcrums are provided on it that abut against the two crank arms respectively.
[0022] Furthermore, the boring machine worktable is provided with several T-slots on which T-slide blocks 4 can be slidably connected. The T-slide blocks are provided with screw holes. The horizontal limiting mechanism, V-shaped tooling, vertical limiting mechanism, shim and fulcrum adjustment mechanism are also provided with screw holes. In the working state, the horizontal limiting mechanism, V-shaped tooling, vertical limiting mechanism, shim and fulcrum adjustment mechanism are positioned relative to the T-slide blocks and boring machine worktable by bolts 5.
[0023] Furthermore, the V-shaped tooling includes a V-shaped tooling body and a bottom ear plate. A V-shaped groove is formed on the V-shaped tooling body, and the bottom ear plate is disposed on the bottom periphery of the V-shaped tooling body, with screw holes provided on the bottom ear plate.
[0024] Furthermore, the V-groove includes two inclined sections on the left and right and a horizontal section connecting the two inclined sections. Gaskets 1 are detachably connected to both inclined sections, and the specifications of the gaskets are adapted to their corresponding inclined sections.
[0025] Furthermore, the fulcrum adjustment mechanism includes a mounting base plate 6, a vertical support rod, and adjustable bolts 12 disposed on the vertical support rod. The vertical support rod has horizontally arranged screw holes and a preset thickness, so that the adjustable bolts on the left and right sides of the vertical support rod will not contact each other even when they are at their closest limit positions. The adjustable bolts are threaded, and the side of the adjustable bolt closest to the crank arm is flat. Nuts are disposed on both the left and right sides of the vertical support rod.
[0026] Furthermore, the vertical limiting mechanism includes a pressure plate 9, a screw 8, a washer 10, and a fastening nut 11. One end of the screw is connected to the pressure plate, and the other end can be connected to the T-shaped slider on the boring machine worktable. The pressure plate has a preset length so that it can press against the top of the two crank arms. The screw position is fixed by installing the fastening nut and washer.
[0027] Furthermore, the horizontal limiting mechanism includes a right-angle plate 13 with holes, which includes a vertical plate and a horizontal plate. The horizontal plate is provided with screw holes, and the vertical plate is provided with several T-slots on which T-shaped sliders can be slidably connected. The adjustable fulcrum is specifically a support rod, which is connected to the T-shaped slider. The position of the support rod is limited by bolts passing through the screw holes around the periphery of the support rod and the screw holes of the T-shaped slider.
[0028] Furthermore, inclined reinforcing ribs are provided at the connection between the vertical and horizontal plates.
[0029] In this embodiment, the T-slots of the boring machine worktable and the perforated right-angle plate are arranged in rows with a preset interval. The width of the through hole at the bottom of the T-slot is greater than the width of the opening at the top, so that the T-slide block can slide in it without being easily removed along its vertical direction.
[0030] Specifically, when clamping the crankshaft pin for hot mounting holes in large marine engine cranks, a lifting rope is used to lift the crankpin, placing it inside a V-shaped fixture. The V-shaped fixture secures the crankpin, preventing X-axis movement that would affect machining (the lifting rope can remain on the crankpin through the gap between the V-shaped fixture's support plates, facilitating workpiece loading and unloading and reducing machining time). Adjustable pads are placed at the bottom of the crank arms to adjust the clamping height. A fulcrum adjustment mechanism is placed between the crank arms to prevent Z-axis movement of the workpiece when the machine tool advances during machining. Horizontal and vertical limiting mechanisms further secure the workpiece. All connecting components in the fixture are adjustable, thus accommodating clamping of various models.
[0031] After using this invention, the processing of hot-fitting holes is no longer limited to gantry milling machines. Furthermore, products manufactured using this clamping method on a floor-type boring and milling machine are nearly identical to those produced by gantry milling machines in terms of both quality and efficiency. Most importantly, it significantly reduces production costs.
[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A large marine engine crankshaft hot hole machining combined tooling device, characterized in that, The engine crank includes two integrally forged crank arms and a crank pin connecting the two crank arms. The combined tooling includes a horizontal limiting mechanism, a V-shaped tooling, a vertical limiting mechanism, a shim, and a fulcrum adjustment mechanism. The bottoms of the horizontal limiting mechanism, the V-shaped tooling, the vertical limiting mechanism, the shim, and the fulcrum adjustment mechanism are all detachably connected to the boring machine worktable. The V-shaped tooling is used to support the crank pin, and the shim is used to support the crank arms. One end of the horizontal limiting mechanism is arranged parallel to one of the crank arms closest to it, and a limiting component is provided on it. The vertical limiting mechanism is located between the two crank arms, with one end pressing against the top of the crank arm and the other end connected to the boring machine worktable. The fulcrum adjustment mechanism is located between the ends of the two crank arms and has adjustable fulcrums that abut against the two crank arms respectively.
2. The large marine engine crank web hot hole machining combined tooling apparatus according to claim 1, characterized in that, The boring machine worktable is provided with several T-slots on which T-shaped sliders can be slidably connected. The T-shaped sliders are provided with screw holes. The horizontal limiting mechanism, V-shaped tooling, vertical limiting mechanism, shims and fulcrum adjustment mechanism are also provided with screw holes. In the working state, the horizontal limiting mechanism, V-shaped tooling, vertical limiting mechanism, shims and fulcrum adjustment mechanism are positioned relative to the T-shaped sliders and the boring machine worktable by bolts.
3. The combined tooling for hot boring of large marine engine crankshaft according to claim 1, characterized in that, The V-shaped fixture includes a V-shaped fixture body and a bottom ear plate. A V-shaped groove is formed on the V-shaped fixture body, and the bottom ear plate is disposed on the bottom periphery of the V-shaped fixture body, with screw holes provided on the bottom ear plate.
4. The large marine engine crank web hot hole machining combined tooling apparatus according to claim 3, characterized in that, The V-groove includes two inclined sections on the left and right and a horizontal section connecting the two inclined sections. Gaskets are detachably connected to both inclined sections, and the specifications of the gaskets are adapted to their corresponding inclined sections.
5. The combined tooling for hot boring of large marine engine crankshaft according to claim 1, characterized in that, The fulcrum adjustment mechanism includes a mounting base plate, a vertical support rod, and adjustable bolts mounted on the vertical support rod. The vertical support rod has horizontally arranged screw holes and a preset thickness, ensuring that the adjustable bolts on both sides of the vertical support rod will not contact each other even when they are at their closest limit positions. The adjustable bolts are threaded, and the side of the adjustable bolt closest to the crank arm is flat. Nuts are provided on both sides of the vertical support rod.
6. The large marine engine crank web hot hole machining combined tooling apparatus according to claim 1, characterized in that, The vertical limiting mechanism includes a pressure plate, a screw, a washer, and a fastening nut. One end of the screw is connected to the pressure plate, and the other end can be connected to a T-shaped slider on the boring machine worktable. The pressure plate has a preset length so that it can press against the top of the two crank arms. The screw position is fixed by installing the fastening nut and washer.
7. The large marine engine crank web hot hole machining combined tooling apparatus according to claim 1, characterized in that, The horizontal limiting mechanism includes a right-angle plate with holes, which includes a vertical plate and a horizontal plate. The horizontal plate is provided with screw holes, and the vertical plate is provided with several T-slots on which T-shaped sliders can be slidably connected. The adjustable fulcrum is specifically a support rod, which is connected to the T-shaped slider. The position of the support rod is limited by bolts passing through the screw holes around the periphery of the support rod and the screw holes of the T-shaped slider.
8. The large marine engine crank web hot hole machining combined tooling apparatus according to claim 1, characterized in that, An inclined reinforcing rib structure is provided at the connection between the vertical plate and the horizontal plate.