A diesel cylinder honing tool and method of use

Abstract

The application discloses a diesel engine cylinder hole polishing tool and a use method thereof, and belongs to the technical field of diesel engine cylinder hole polishing tools.The diesel engine cylinder hole polishing tool comprises long screws, a support plate, a middle shaft, a support frame, polishing blocks and adjusting nuts; a plurality of long screws are one-to-one correspondingly screwed into preset positioning screw holes around a diesel engine cylinder hole; the upper portions of all the long screws are jointly provided with the support plate, and the support plate is fixed on the long screws through nuts; a positioning sleeve is fixed at the center of the support plate, and a rotatable middle shaft is coaxially arranged in the positioning sleeve; the diesel engine cylinder hole polishing tool is light in weight, can be operated by one person, is high in coaxial positioning precision, is modularized and can be individually replaced, does not need to be re-aligned, has small cutting allowance, and can remove fine scratches and oxide layers of the cylinder hole at one time; the use method is simple in process, stable in positioning, solves the problems of the traditional polishing tool, such as being heavy, uneven in machining allowance, polishing only on one side, and complicated replacement of consumables, and is suitable for V-type diesel engine cylinder hole repair.

Description

Technical Field

[0001] This invention relates to the field of diesel engine machining tooling technology, specifically to a diesel engine cylinder bore polishing tool and its usage method. Background Technology

[0002] The engine block is the core load-bearing component of a diesel engine, and the surface quality of the cylinder bore seal directly determines the engine's assembly sealing performance and operational reliability. After long-term service, the cylinder bore seal is prone to minor scratches and slight wear, as well as oxidation, yellowing, and blackening, which significantly reduces sealing performance. Therefore, polishing and repair of the cylinder bore inner wall and seal are necessary.

[0003] The existing cylinder bore grinding tools are mostly heavy-duty integral barrel structures, which have the following defects: (1) The overall weight of the tooling is large, making it difficult for a single person to carry and clamp, resulting in low work efficiency. In addition, traditional tooling can only grind the sealing strip separately and cannot simultaneously complete the polishing of the cylinder bore sidewall. The process is separated, and the processing cycle is long. (2) The grinding removal of the machining allowance is too large, which is only suitable for severe wear and deep scratch conditions. Slight oxidation and minor scratch repairs are prone to causing dimensional deviations. (3) Due to the influence of the engine weight, the coaxiality of traditional barrel grinding tooling is difficult to guarantee, the grinding allowance is unevenly distributed, and it is easy to damage the original forming contour of the sealing strip. (4) The polishing consumables are highly integrated with the main body of the tooling. After the polishing block is worn, the tooling needs to be completely disassembled and realigned. Replacing consumables takes a long time and the maintenance cost is high. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the existing defects and provide a diesel engine cylinder bore polishing tool and its usage method, which realizes lightweight design, rapid positioning of screw hole reference, simultaneous polishing of cylinder bore sidewall and sealing strip, independent modular polishing block, replacement without realignment, and is suitable for V-type diesel engine cylinder bore repair operations.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a diesel engine cylinder bore polishing tool, comprising a long screw, a support plate, an intermediate shaft, a support frame, a polishing block, and an adjusting nut;

[0006] Multiple long screws are screwed into the pre-set positioning screw holes around the cylinder bore of the diesel engine, and a support plate is passed through the upper part of all the long screws. The support plate is fixed to the long screws by nuts.

[0007] A positioning sleeve is fixed at the center of the support plate, and a rotatable intermediate shaft is coaxially inserted inside the positioning sleeve.

[0008] The support frame is slidably sleeved on the lower outer wall of the intermediate shaft. The bottom outer circumference of the intermediate shaft is provided with an external thread. The adjusting nut is threadedly assembled at the bottom end of the intermediate shaft and located below the support frame. Rotating the adjusting nut can control the axial height of the support frame.

[0009] The support frame is evenly arranged with multiple sets of compression springs and polishing blocks along the radial direction. One end of each set of compression springs abuts against the support frame, and the other end presses against the polishing block, so that the polishing block simultaneously fits against the two machined surfaces of the cylinder bore sidewall and the cylinder bore sealing strip.

[0010] As a preferred embodiment of the present invention, the outer wall of the intermediate shaft is fitted with bushing I and bushing II from top to bottom. Bushing I and bushing II cooperate with each other to achieve coaxial positioning of the positioning sleeve and the intermediate shaft.

[0011] As a preferred embodiment of the present invention, a positioning spring is fitted on the intermediate shaft. The positioning spring is located between the bushing II and the support frame. The positioning spring and the adjusting nut cooperate to jointly limit the axial height position of the support frame.

[0012] As a preferred embodiment of the present invention, four bushings are evenly distributed vertically on the outer periphery of the support frame. Each bushing has a guide groove radially opened inside. A guide rod is slidably assembled in the guide groove. The guide rod is integrally connected with the polishing block. The compression spring is sleeved on the outside of the guide rod and is limited between the bushing and the polishing block.

[0013] As a preferred embodiment of the present invention, the top end of the intermediate shaft is integrally formed with a rotating handle.

[0014] As a preferred embodiment of the present invention, the polishing block is provided with a double polishing working surface, and the two polishing working surfaces are respectively matched with the cylinder bore side and the cylinder bore sealing strip.

[0015] A method for using a diesel engine cylinder bore polishing tool includes the following steps:

[0016] S1: Parts preparation and inspection, ensure all polishing tool parts are in place, check the double polishing working surface of the polishing block, and replace the polishing block with a brand new one if the working surface is worn and ineffective.

[0017] S2: Cleaning treatment, cleaning the inner wall of the diesel engine cylinder bore, the sealing area, and the mating surfaces of the inner bores of bushing I and bushing II;

[0018] S3: Pre-assemble the tooling, assemble all components of the polishing tool, and apply lubricating oil to the rotating and mating parts of the tool;

[0019] S4: Fixture positioning and fixing, screw multiple long screws into the positioning screw holes around the cylinder bore, and fit the support plate on the upper end of the long screws and tighten the nuts to fix it;

[0020] S5: Adjust the height of the support frame. Rotate the adjusting nut at the bottom of the intermediate shaft to adjust the axial height of the support frame so that the compression spring forms a stable preload force, ensuring that the polishing block can press tightly against the cylinder bore sealing strip.

[0021] S6: Synchronous polishing operation, the rotating handle drives the intermediate shaft and support frame to rotate synchronously, the pressure spring continuously applies radial pressure to the polishing block, the polishing block simultaneously polishes the side of the cylinder bore and the cylinder bore sealing strip, removing small scratches, wear marks, and oxidation blackening and yellowing layers from the workpiece surface.

[0022] S7: Completed inspection and disassembly. After polishing, wipe the cylinder bore and sealing strip. Visually inspect the surface for a bright finish and ensure it is smooth to the touch without burrs. This indicates that the polishing is qualified. Then, disassemble the entire set of polishing tools in sequence.

[0023] Compared with the prior art, the beneficial effects of the present invention are: (1) It abandons the traditional heavy integral barrel grinding body, adopts the original assembly screw hole of the cylinder bore as the positioning reference, and modularly disassembles the structure. The overall weight of the tooling is greatly reduced. A single person can complete the entire process of handling, clamping and polishing. It is suitable for V-type diesel engine cylinder bore repair and avoids the problem of uneven grinding allowance caused by its own weight; (2) It relies on the multi-point support plate of the inherent screw hole around the cylinder bore, and cooperates with the coaxial positioning structure of bushing I and bushing II to ensure that the rotation center of the intermediate shaft is completely coincident with the center of the cylinder bore. The polishing allowance is uniform and will not damage the original contour of the sealing strip. Moreover, the polishing block integrates the double polishing working surface. The cylinder bore sidewall and cylinder bore sealing strip can be polished simultaneously in one rotation, simplifying the process and shortening the processing time; (3) The polishing block is independently assembled by the guide rod and the clamping spring. When the polishing block is worn and fails, there is no need to disassemble the main tooling such as the support plate and the long screw. There is no need to readjust. The processing can be resumed by replacing the polishing block alone, which greatly reduces the downtime maintenance time. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the cylinder bore structure;

[0026] Figure 3 This is a schematic diagram showing the connection between the support frame and the polishing block;

[0027] Figure 4 for Figure 3 Top view.

[0028] In the diagram: 1. Long screw, 2. Support plate, 3. Positioning sleeve, 4. Intermediate shaft, 5. Bushing I, 6. Bushing II, 7. Support frame, 8. Polishing block, 9. Positioning spring, 10. Compression spring, 11. Adjusting nut, 12. Bushing, 13. Guide groove, 14. Guide rod, 15. Rotary handle. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments (for ease of description and understanding, the following refers to...). Figure 1 (The above is described above). Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of the present invention.

[0030] like Figure 1-4 The present invention provides a technical solution: a diesel engine cylinder bore polishing tool, comprising a long screw 1, a support plate 2, an intermediate shaft 4, a support frame 7, a polishing block 8, and an adjusting nut 11;

[0031] Four assembly positioning screw holes are reserved on the outer circumference of the diesel engine cylinder bore. The long screw 1 is screwed into the positioning screw holes one by one. The support plate 2 is horizontally mounted on the upper end of the four long screw 1. The nut locks the support plate 2. The original screw holes of the engine body are used as the positioning reference. Multi-point support ensures the horizontal stability of the tooling. The center of the support plate 2 is welded to the fixed positioning sleeve 3 as the intermediate shaft rotation reference.

[0032] The intermediate shaft 4 passes through the positioning sleeve 3. The outer wall of the intermediate shaft 4 is fitted with bushing I5 and bushing II6 from top to bottom. The double bushings support the intermediate shaft 4 in sections, eliminating radial clearance and ensuring that the rotation axis of the intermediate shaft 4 is coaxial with the center of the cylinder bore. This ensures that the rotation center of the intermediate shaft 4 is completely coincident with the center of the cylinder bore, and the polishing allowance is uniform, without damaging the original contour of the sealing strip.

[0033] In this embodiment, the top of the intermediate shaft 4 is integrally bent into a handle 15, and the intermediate shaft 4 can be driven to rotate as a whole by manually rotating the handle 15.

[0034] The support frame 7 is slidably sleeved on the lower outer wall of the intermediate shaft 4. A positioning spring 9 is sleeved on the intermediate shaft 4. The positioning spring 9 is located between the bushing II6 and the support frame 7. The positioning spring 9 continuously pushes the support frame 7 downward.

[0035] The bottom outer circumference of the intermediate shaft 4 is provided with an external thread. The adjusting nut 11 is threaded onto the bottom end of the intermediate shaft 4 and located below the support frame 7. The positioning spring 9 and the adjusting nut 11 cooperate to limit the axial height position of the support frame 7.

[0036] Rotating the adjusting nut 11 downwards will press down the support frame 7 under the restoring force of the positioning spring 9. Rotating the adjusting nut 11 upwards will cause the positioning spring 9 to retract and raise the support frame 7. This allows for precise control of the axial height of the support frame 7, matching the axial position of the cylinder bore seal strip. It is suitable for the axial position of the cylinder bore seal strip of different specifications of diesel engines and has strong tooling versatility.

[0037] The support frame 7 has four bushings 12 evenly arranged in the circumferential direction. Each bushing 12 has a radial guide groove 13 inside. The guide rod 14 is slidably installed in the guide groove 13, and the outer end of the guide rod 14 is fixed with a polishing block 8.

[0038] The compression spring 10 is sleeved on the outside of the guide rod 14, with its two ends abutting against the end face of the bushing 12 and the inner side of the polishing block 8, respectively. It continuously pushes the polishing block 8 outward. The inner side of the polishing block 8 is a beveled surface that matches the cylinder bore sealing strip, while the outer straight surface fits against the inner wall of the cylinder bore, forming a double polishing working surface. During the rotation process, the two machined surfaces are polished simultaneously. The compression spring 10 is radially flexible and presses tightly, resulting in a small polishing cutting amount. It only removes minor scratches and oxide layers, and will not cause overcutting of the cylinder bore or sealing strip size. It can accommodate both new machine repair and old machine refurbishment conditions.

[0039] After the polishing block 8 wears out, the guide rod 14 can be pulled out by simply compressing the clamping spring 10 to replace the polishing block 8. There is no need to disassemble the support plate 2 or the long screw 1, and there is no need to recalibrate the coaxiality.

[0040] The above-mentioned diesel engine cylinder bore polishing tools are used to repair oxidation and minor scratches on the V-type diesel engine cylinder bore seal. The operation steps are as follows:

[0041] S1: Parts and Components Preparation Inspection

[0042] Inventory all accessories including the long screw 1, support plate 2, intermediate shaft 4, support frame 7, polishing block 8, positioning spring 9, compression spring 10, etc.

[0043] Inspect each of the four polishing blocks 8 on its double polishing surface. If abrasive material falls off or the surface wears unevenly, replace the polishing block 8 with a brand new one.

[0044] S2: Cleaning Pretreatment

[0045] Use a brush and compressed air to clean the inner wall of the cylinder bore, the steps of the sealing strip, and remove iron filings, oil stains, and oxide scale; wipe the inner bore of bushing I5 and bushing II6 to remove impurities and prevent jamming or scratching of the intermediate shaft during rotation.

[0046] S3: Pre-lubricated tooling

[0047] Insert bushing I5 and bushing II6 into intermediate shaft 4 in sequence, assemble positioning spring 9 and support frame 7, and pre-install adjusting nut 11 at the bottom of intermediate shaft 4.

[0048] Apply grease to the mating surfaces of the positioning sleeve 3 inner hole, bushing I5, bushing II6 and intermediate shaft 4 to reduce rotational friction resistance.

[0049] S4: Fixture overall positioning and fixing

[0050] Screw the four long screws 1 into the corresponding positioning screw holes around the cylinder bore, ensuring that the screwing depth is consistent. Pass the support plate 2 through the upper end of the four long screws 1, install nuts on the support plate 2 and tighten them evenly to ensure that the support plate 2 is horizontal and not tilted.

[0051] S5: Support frame height adjustment

[0052] Hold the upper handle 15 of the intermediate shaft 4 and insert the intermediate shaft 4 into the center positioning sleeve 3 of the support plate 2; rotate the bottom adjusting nut 11 to adjust the height of the support frame 7 so that the axial position of the polishing block 8 is aligned with the cylinder bore sealing strip step.

[0053] The positioning spring 9 supports the support frame 7 upwards, the compression spring 10 forms a stable preload, and the polishing block 8 naturally fits the inner wall of the cylinder bore and the sealing strip.

[0054] S6: Simultaneous Polishing Operation

[0055] Manually rotate the handle 15 at a constant speed to drive the intermediate shaft 4, support frame 7, and four polishing blocks 8 to rotate around the cylinder bore circumference.

[0056] The compression spring 10 continuously provides radial pressure, and the polishing block 8 simultaneously rubs the cylinder bore sidewall and sealing strip with both working surfaces, rotating continuously for 3 to 5 minutes to gradually remove fine scratches and yellowed or blackened oxide layers from the surface.

[0057] S7: Quality Inspection and Tooling Disassembly

[0058] Stop rotating, lift the intermediate shaft 4 upwards to remove the polishing mechanism, wipe the cylinder hole and sealing strip with a cotton cloth. The surface is visually free of scratches, has a uniform and bright color, and is free of burrs and unevenness when touched. The polishing is qualified. Then, disassemble the adjusting nut 11, intermediate shaft 4, support plate 2, and long screw 1 in sequence, clean the tooling and store it for later use.

[0059] The parts of the invention not described in detail are prior art. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A diesel engine cylinder bore polishing tool, characterized in that: It includes a long screw (1), a support plate (2), an intermediate shaft (4), a support frame (7), a polishing block (8), and an adjusting nut (11); Multiple long screws (1) are screwed into the positioning screw holes around the cylinder bore of the diesel engine in a one-to-one correspondence. A support plate (7) is passed through the upper part of all the long screws (1). The support plate (2) is fixed to the long screws (1) by nuts. The center of the support plate (2) is fixedly provided with a positioning sleeve (3), and a rotatable intermediate shaft (4) is coaxially inserted inside the positioning sleeve (3). The support frame (7) is slidably sleeved on the lower outer wall of the intermediate shaft (4). The bottom outer circumference of the intermediate shaft (4) is provided with an external thread. The adjusting nut (11) is threadedly fitted to the bottom end of the intermediate shaft (4) and located below the support frame (7). Rotating the adjusting nut (11) can control the axial height of the support frame (7). The support frame (7) is evenly arranged with multiple sets of compression springs (10) and polishing blocks (8) in the radial direction. One end of each set of compression springs (10) abuts against the support frame (7), and the other end presses against the polishing block (8), so that the polishing block (8) simultaneously fits against the two processing surfaces of the cylinder bore sidewall and the cylinder bore sealing strip.

2. The diesel engine cylinder bore polishing tool according to claim 1, characterized in that: The outer wall of the intermediate shaft (4) is fitted with bushing I (5) and bushing II (6) from top to bottom. Bushing I (5) and bushing II (6) cooperate with each other to achieve coaxial positioning of positioning sleeve (3) and intermediate shaft (4).

3. A diesel engine cylinder bore polishing tool according to claim 2, characterized in that: A positioning spring (9) is fitted on the intermediate shaft (4). The positioning spring (9) is located between the bushing II (6) and the support frame (7). The positioning spring (9) and the adjusting nut (11) cooperate to limit the axial height position of the support frame (7).

4. A diesel engine cylinder bore polishing tool according to claim 1, characterized in that: The support frame (7) has four bushings (12) evenly distributed vertically on its outer periphery. Each bushing (12) has a guide groove (13) radially opened inside. A guide rod (14) is slidably assembled in the guide groove (13). The guide rod (14) is integrally connected with the polishing block (8). The compression spring (10) is sleeved on the outside of the guide rod (14) and the compression spring (10) is limited between the bushing (12) and the polishing block (8).

5. A diesel engine cylinder bore polishing tool according to claim 1, characterized in that: The top of the intermediate shaft (4) is integrally formed with a rotating handle (15).

6. A diesel engine cylinder bore polishing tool according to claim 1, characterized in that: The polishing block (8) is provided with a double polishing working surface, and the two polishing working surfaces are respectively matched with the cylinder bore side and the cylinder bore sealing strip.

7. A method of using a diesel engine cylinder bore polishing tool according to any one of claims 1-6, characterized in that: Includes the following steps: S1: Check the parts preparation, equip all the polishing tool parts, check the polishing block (8) double polishing working surface, if the working surface is worn and ineffective, replace it with a brand new polishing block in advance; S2: Cleaning treatment, cleaning the inner wall of the diesel engine cylinder bore, the sealing strip area, and the mating surfaces of the inner bores of bushing I (5) and bushing II (6); S3: Pre-assemble the tooling, assemble all components of the polishing tool, and apply lubricating oil to the rotating and mating parts of the tool; S4: Fixture positioning and fixing, screw multiple long screws (1) into the positioning screw holes around the cylinder hole, and put the support plate (2) on the upper end of the long screws (1) and tighten the nut to fix it; S5: Adjust the height of the support frame. Rotate the adjusting nut (11) at the bottom of the intermediate shaft (4) to adjust the axial height of the support frame (7) so that the compression spring (10) forms a stable pre-tightening force, ensuring that the polishing block (8) can press tightly against the cylinder bore sealing strip. S6: Synchronous polishing operation, rotating the handle (15) drives the intermediate shaft (4) and support frame (7) to rotate synchronously, and the compression spring (10) continuously applies radial pressure to the polishing block (8). The polishing block (8) simultaneously polishes the side of the cylinder hole and the cylinder hole sealing strip, removing small scratches, wear marks, and oxidation blackening and yellowing layers from the workpiece surface. S7: Completed inspection and disassembly. After polishing, wipe the cylinder bore and sealing strip. Visually inspect the surface for a bright finish and ensure it is smooth to the touch without burrs. This indicates that the polishing is qualified. Then, disassemble the entire set of polishing tools in sequence.

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