A precision honing device for cylindrical holes

Abstract

Provided is a cylindrical hole precision honing processing device, an adapter sleeve is connected to a honing machine spindle through a key; an adapter sleeve outside fastening sleeve is fixedly connected to the honing machine spindle through internal thread I, and the fastening sleeve is tightly fixed to the adapter sleeve; a jack is installed in the adapter sleeve body; a flat end screw limits the radial rotation of the jack while preventing excessive displacement of the jack; an external thread of the adapter sleeve is provided with a locking nut and a honing sleeve rod, the locking nut locks the position of the honing sleeve rod, and the honing sleeve rod adjusts the initial expansion position of an oil stone seat and an oil stone; the oil stone seat is arranged at the front end of the honing sleeve rod; an inner wedge surface of the oil stone seat is in close contact with an outer taper surface of a honing rod core shaft, and the oil stone expands or retracts when the jack pushes the honing rod core shaft to axially slide; the honing sleeve rod sleeve body is further provided with an axle check ring, a compression spring and a washer; the compression spring is provided with the axle check ring and the washer at both ends; and the compression spring is used to realize the axial elastic displacement of the honing rod core shaft. The device realizes low-cost, efficient, convenient, high-precision and batch processing of holes, and is suitable for promotion.

Description

Technical Field

[0001] This utility model belongs to the field of honing tool technology, specifically relating to a precision honing device for cylindrical holes. Background Technology

[0002] Currently, mechanical manufacturing enterprises generally use turning, drilling, boring, and grinding methods to process cylindrical holes on parts. Although traditional processing methods can achieve high precision requirements, they are inefficient, produce poor surface roughness, and fail to meet usage requirements. To achieve efficient, convenient, batch, and high-precision processing of high-precision cylindrical holes, the following technical solution is proposed. Utility Model Content

[0003] The technical problem solved by this utility model is to provide a precision honing device for cylindrical holes, which solves the technical problem of how to achieve efficient, convenient, batch, and high-precision machining of cylindrical holes.

[0004] The technical solution adopted by this utility model is as follows: A precision honing processing device for cylindrical holes, comprising an adapter sleeve, wherein the adapter sleeve is connected to the honing machine spindle via a flat key and rotates synchronously with the honing machine spindle; a fastening sleeve is provided on the outer side of the adapter sleeve, the fastening sleeve is fixed to the honing machine spindle via an internal thread I, and the fastening sleeve is also fastened to the adapter sleeve via radial screws; a push rod is axially slidingly installed inside the adapter sleeve; a flat-end screw is radially installed on the adapter sleeve, the flat-end screw restricting the radial rotation of the push rod while preventing over-displacement of the push rod; a locking nut and a honing sleeve rod are rotatably installed on the adapter sleeve via an external thread, the locking nut being used to lock the position of the honing sleeve rod, and rotating the honing sleeve rod being used to adjust the position of the oilstone seat and the initial expansion position of the oilstone; The oilstone is installed on the outer wall of the oilstone seat, which is installed at the front end of the honing sleeve rod. The inner wedge surface of the oilstone seat fits against the outer conical surface at the front end of the honing rod spindle. When the push rod pushes the honing rod spindle axially, the honing rod spindle and the oilstone seat move in coordination to expand or retract the oilstone. The honing sleeve rod also has a shaft retaining ring, a compression spring, and a washer. The compression spring is sleeved in the middle of the honing rod spindle shaft, and the two ends of the compression spring are respectively provided with a shaft retaining ring and a washer. The shaft retaining ring is located on the end face of the adapter sleeve shaft, and the shaft retaining ring engages with the annular groove of the honing rod spindle shaft. The washer is located on the inner end face of the honing sleeve rod. The compression spring is used to realize the axial elastic displacement of the honing rod spindle.

[0005] In the above technical solution, further: the adapter sleeve body has a keyway, the keyway is used to install a flat key, there are two keyways, and the two keyways are arranged symmetrically; the adapter sleeve body has a light hole for sliding adaptation and mounting a top rod, and the adapter sleeve body has a flat-end screw mounting hole radially formed in the middle, the flat-end screw mounting hole is used to install a flat-end screw.

[0006] In the above technical solution, further: the small diameter end gap at the front end of the fastening sleeve body is appropriately fitted to the outside of the adapter sleeve; the inner wall of the large diameter end at the rear end of the fastening sleeve body is provided with an internal thread I; a plurality of radial screw mounting holes are radially provided in the middle of the fastening sleeve body, the four radial screw mounting holes are symmetrically and evenly distributed in the center, and the radial screws are installed in the screw mounting holes.

[0007] In the above technical solution, further: the center of the power input end of the push rod is provided with an internal threaded hole, and the front end of the push rod is attached to the tail end plane of the honing rod spindle to push the honing rod spindle to slide axially; the top end of the power input end of the push rod is provided with a limiting groove in the axial direction, and the flat end screw is screwed into the limiting groove and slides and adapts to the limiting groove, thereby limiting the radial rotation of the push rod while preventing the push rod from over-displacement.

[0008] In the above technical solution, the locking nut is further provided with a radial locking screw hole, and a radial locking screw is installed in the radial locking screw hole to prevent the locking nut from loosening and shifting.

[0009] In the above technical solution, further: the honing sleeve has an internal thread II at its tail, and a positioning boss I is formed at the tail of the internal thread II. The positioning boss I positions and installs a shaft retaining ring; a positioning boss II is formed at a certain distance from the positioning boss I, and the positioning boss II is used to mount a washer. The compression spring is press-fitted between the washer and the shaft retaining ring; the front end of the honing sleeve has a plurality of centrally symmetrical honing stone seat mounting grooves radially formed, each of the honing stone seat mounting grooves being an axial strip groove, the honing stone seat mounting grooves installing honing stone seats, and the honing stone seats installing honing stones; and the two ends of the honing stone seat mounting grooves are respectively formed with annular grooves for installing wire rings.

[0010] In the above technical solution, further: the oilstone base is a block structure, and a number of inner wedge surfaces are formed on the inner side of the oilstone base at certain axial intervals; the two ends of the outer side of the oilstone base are respectively provided with limiting grooves, the limiting grooves are adapted to install steel wire rings, and the steel wire rings prevent the oilstone base from falling off; an oilstone mounting groove is formed in the middle of the outer side of the oilstone base, and the oilstone is embedded in the oilstone mounting groove.

[0011] In the above technical solution, further: the front end of the honing rod mandrel body is provided with a number of outer conical surfaces at a certain distance, and the outer conical surfaces are in contact with the inner wedge surfaces; the middle part of the honing rod mandrel body is provided with an annular groove, and the annular groove is adapted to engage the retaining ring of the shaft.

[0012] Advantages of this utility model compared to the prior art:

[0013] 1. The overall structure of this utility model can achieve high-precision, efficient and convenient hole processing, quick and simple clamping, effectively improve processing efficiency, save manufacturing costs, and facilitate batch processing.

[0014] 2. This utility model adapter sleeve integrates three core designs into a single body: double keyway symmetrical transmission, optical hole precision guidance, and flat-end screw radial limiting. The integrated design reduces the axial length of the adapter sleeve by 20%, from the traditional 80mm to 64mm, and the radial dimension by 15%, adapting to more machine installation spaces. The assembly time of a single adapter sleeve is reduced from 45 minutes in the traditional structure to 15 minutes, and multiple calibrations are not required, with an assembly consistency of 99.5%. The integrated design reduces the number of parts from 5 to 1, reducing material costs by 30% and processing costs by 40%. It achieves high torque transmission, high-precision motion control, and high-reliability limiting, while optimizing space utilization and assembly efficiency through integrated design, and reducing material costs.

[0015] 3. The fastening sleeve of this utility model is connected to the spindle thread through the internal thread I, and is also fixed to the adapter sleeve secondary by radial screws, forming a double constraint of axial + radial. Compared with single thread fixation, the vibration resistance is improved by more than 3 times, which can effectively suppress fretting wear during high-speed rotation and extend the service life of the equipment. The fastening sleeve achieves high-precision, high-strength and high-reliability connection functions through three core designs: front-end gap adaptation positioning, rear-end threaded connection and four radial screws in the middle for anti-loosening. At the same time, the modular design optimizes the assembly and maintenance efficiency.

[0016] 4. The flat-end screw of this utility model is radially installed on the adapter sleeve. The end of the flat-end screw cooperates with the limiting groove made axially on the push rod to limit the maximum displacement of the push rod, prevent the push rod from being pushed too much and causing the oilstone to expand excessively, and improve the safety of the system.

[0017] 5. The axial position of the honing sleeve rod and the locking nut can be adjusted by rotating the honing sleeve rod, thereby changing the initial compression amount, i.e., the preload, of the honing stone seat. By adjusting the preload, the cutting efficiency of the honing stone on materials such as steel, cast iron, and aluminum alloy can be optimized. When the honing stone is worn, the radial dimension can be compensated by tightening the honing sleeve rod, extending the service life of the honing stone by more than 30%.

[0018] 6. This utility model's push rod achieves high precision, high stability, and high reliability of the honing device's motion system through three innovative designs: efficient power transmission via internal threaded holes, precise pushing with front-end flat contact, and anti-rotation and anti-over-displacement through the coordinated use of limiting slide grooves and flat-end screws. This significantly improves processing quality, equipment utilization, and economic benefits, providing a key motion control solution for precision honing technology.

[0019] 7. The front end of the push rod of this utility model is designed as a planar structure, forming a surface contact with the tail plane of the honing rod spindle. The axial pushing force of the push rod is uniformly transmitted to the honing rod spindle through the plane, avoiding stress concentration caused by point contact or line contact. The surface contact design ensures that the coaxiality error between the push rod and the honing rod spindle is ≤0.003mm, which is much lower than that of the traditional ball joint connection. It effectively avoids the excessive ellipticity of the hole diameter caused by the eccentricity of the honing rod spindle, optimizing it from 0.015mm to 0.002mm. The friction coefficient of the planar contact surface is stable, and there is no jumping or jamming during the pushing process, which enhances the stability of the movement. The planar structure wears evenly, and the service life is 3 times longer than that of the ball joint connection, and the maintenance cycle is extended from every 2000 hours to 6000 hours.

[0020] 8. The radial locking screw hole and locking nut of this utility model constitute a dual safety mechanism of "axial locking + radial anti-loosening", which significantly improves the connection reliability, vibration resistance and maintenance convenience of the honing device motion system.

[0021] 9. This utility model's compression spring absorbs impact loads while automatically resetting the honing rod mandrel. When the push rod is pushed too fast or there are hard points on the hole wall, the compression spring can absorb part of the impact force, reducing the peak force by 40% and preventing the honing stone from cracking or the honing rod mandrel from deforming. After processing, the compression spring can push the honing rod mandrel back, causing the honing stone to retract automatically and avoiding interference with the hole wall. In deep hole honing of molds, this elastic mechanism reduces the honing stone cracking rate from 8% to 0.5%, significantly reducing the frequency of downtime maintenance.

[0022] 10. The structural design of the honing sleeve of this utility model, through a multi-level positioning system, an elastic pre-tightening mechanism, and a modular honing stone installation structure, constructs a three-in-one technical system of "high-precision positioning - dynamic compensation - efficient changeover", which significantly improves the dimensional stability, surface quality consistency, and overall equipment efficiency of honing. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the half-section assembly structure of this utility model;

[0024] Figure 2 This utility model Figure 1 AA section view;

[0025] Figure 3 This utility model Figure 1 BB cross-sectional view;

[0026] Figure 4 This is a cross-sectional view of the adapter sleeve of this utility model;

[0027] Figure 5 This utility model Figure 4 A longitudinal section view of the location of the keyway;

[0028] Figure 6 This is a half-sectional view of the fastening sleeve of this utility model;

[0029] Figure 7 This utility model Figure 6 Left view;

[0030] Figure 8 This is a sectional view of the top rod of this utility model;

[0031] Figure 9 This utility model Figure 8 CC section view of the push rod;

[0032] Figure 10 This is a half-sectional view of the locking nut of this utility model;

[0033] Figure 11 This is a half-sectional view of the honing sleeve rod of this utility model;

[0034] Figure 12 For utility model Figure 11 DD section view of the honing sleeve;

[0035] Figure 13 This is a front view of the honing rod mandrel of this utility model;

[0036] Figure 14 This is a front view of the oilstone base of this utility model;

[0037] Figure 15 This utility model Figure 14 Left view of the oilstone base;

[0038] Figure 16 This utility model Figure 14 Bottom view of the oilstone base;

[0039] Figure 17 This is a front view of the oilstone of this utility model;

[0040] Figure 18 This is a perspective view of the present utility model;

[0041] In the diagram: 1-Adapter sleeve, 101-Keyway, 102-Smooth hole, 103-Flat-end screw mounting hole, 104-External thread, 2-Flat-end screw, 3-Fastening sleeve, 301-Internal thread I, 302-Radial screw mounting hole, 4-Push rod, 401-Internal thread hole, 402-Limiting groove, 5-Locking nut, 501-Radial locking screw hole, 6-Shaft retaining ring, 7-Compression spring, 8-Washer, 9- Honing sleeve, 901-Internal thread II, 902-Positioning boss I, 903-Positioning boss II, 904-Honker stone seat mounting groove, 905-Wire ring annular groove, 10-Honker stone, 11-Honker stone seat, 1101-Inner wedge surface, 1102-Limiting groove, 1103-Honker stone mounting groove, 12-Honkering rod spindle, 1201-Outer conical surface, 1202-Annular groove, 13-Wire ring, 14-Flat key. Detailed Implementation

[0042] The following will refer to the appendix in the embodiments of this utility model. Figure 1-18 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and 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.

[0043] (like Figure 1 , Figure 18 As shown, a precision honing device for cylindrical holes has an adapter sleeve 1, which is connected to the honing machine spindle via a flat key 14 and rotates synchronously with the honing machine spindle.

[0044] It should be noted that the adapter sleeve 1 is rigidly connected to the honing machine spindle via the flat key 14, ensuring that the adapter sleeve 1 is completely synchronized when the spindle rotates, eliminating transmission errors. The flat key 14 connection can withstand higher torque, increasing the torque by more than 50%, and there is no risk of slippage, making it suitable for high-load precision machining.

[0045] The adapter sleeve 1 is provided with a fastening sleeve 3 on its outer side. The fastening sleeve 3 is fixed to the honing machine spindle by the internal thread I301 and is also fastened to the adapter sleeve 1 by radial screws.

[0046] It should be noted that the fastening sleeve 3 is connected to the spindle thread through the internal thread I301, and is also fixed to the adapter sleeve 1 twice through the radial screw, forming a double constraint of axial + radial. Compared with single thread fixation, the vibration resistance is improved by more than 3 times, which can effectively suppress fretting wear during high-speed rotation and extend the service life of the equipment.

[0047] The adapter sleeve 1 is axially slidingly displaced to install the push rod 4; the adapter sleeve 1 is radially installed with a flat-end screw 2, which restricts the radial rotation of the push rod 4 while preventing the push rod 4 from over-displacement.

[0048] It should be noted that: the flat-end screw 2 is radially installed on the adapter sleeve 1, and the end of the flat-end screw 2 cooperates with the limiting groove 402 axially provided on the push rod 4 as described later, which limits the maximum displacement of the push rod 4, prevents the push rod 4 from being pushed too much and causing the oilstone 10 to expand excessively, and improves the safety of the system.

[0049] The adapter sleeve 1 is mounted with a locking nut 5 and a honing rod 9 by rotating the external thread 104. The locking nut 5 is used to lock the position of the honing rod 9, and rotating the honing rod 9 is used to adjust the initial expansion position of the oilstone seat 11 and the oilstone 10.

[0050] It should be noted that rotating the honing sleeve 9 adjusts the axial position of the honing sleeve 9 and the locking nut 5, thereby changing the initial compression, i.e., the preload, of the honing stone seat 11. By adjusting the preload (e.g., within the range of 50-200N), the cutting efficiency of the honing stone 10 on materials such as steel, cast iron, and aluminum alloys can be optimized. When the honing stone 10 wears, tightening the honing sleeve 9 can compensate for the radial dimension, extending the service life of the honing stone 10 by more than 30%.

[0051] The honing stone 10 is installed on the outer wall of the honing stone seat 11, and the honing stone seat 11 is installed at the front end of the honing sleeve 9; the inner wedge surface 1101 of the honing stone seat 11 is in contact with the outer conical surface 1201 of the front end of the honing rod spindle 12; when the push rod 4 performs the end-pushing axial sliding displacement of the honing rod spindle 12, the honing rod spindle 12 and the honing stone seat 11 move in coordination to expand or retract the honing stone 10 (e.g. Figure 3 (As shown).

[0052] It should be noted that the inner wedge surface 1101 of the honing stone seat 11 forms line contact with the outer conical surface 1201 of the honing rod spindle 12. When the push rod 4 pushes the honing rod spindle 12 axially, the axial force is converted into radial expansion force through the conical surface angle. The conical surface fit can achieve a radial displacement resolution of 0.1μm, meeting the requirements of high-precision hole machining. When the push rod 4 stops pushing, the conical surface friction can prevent the honing stone 10 from retracting, ensuring machining stability.

[0053] The honing sleeve 9 is also provided with a shaft retaining ring 6, a compression spring 7, and a washer 8. The compression spring 7 is sleeved in the middle of the honing rod spindle 12 shaft body, and the two ends of the compression spring 7 are respectively provided with a shaft retaining ring 6 and a washer 8. The shaft retaining ring 6 is provided on the shaft end face of the adapter sleeve 1, and the shaft retaining ring 6 engages with the annular groove 1202 provided in the honing rod spindle 12 shaft body. The washer 8 is provided on the inner end face of the honing sleeve 9. The compression spring 7 is used to realize the axial elastic displacement of the honing rod spindle 12.

[0054] It should be noted that the compression spring 7 is fitted into the middle of the honing rod spindle 12. One end of the compression spring 7 is fixed to the end face of the adapter sleeve 1 shaft by a shaft retaining ring 6 and engages with the annular groove 1202 of the honing rod spindle 12. The other end of the compression spring 7 is limited by a washer 8, forming an elastic buffer structure for the honing rod spindle 12. The compression spring 7 absorbs impact loads while also enabling the honing rod spindle 12 to automatically reset. That is, when the push rod 4 pushes too fast or there are hard points on the hole wall, the compression spring 7 can absorb part of the impact force, such as reducing the peak force by 40%, preventing the honing stone 10 from cracking or the honing rod spindle 12 from deforming. After processing, the compression spring 7 can push the honing rod spindle 12 back, causing the honing stone 10 to automatically retract and avoid interference with the hole wall. In deep hole honing of molds, this elastic mechanism reduces the cracking rate of the honing stone 10 from 8% to 0.5%, significantly reducing the frequency of downtime maintenance.

[0055] Based on the above structure, components such as the adapter sleeve 1, honing sleeve 9, and honing stone seat 11 adopt standardized thread and keyway dimensions, supporting rapid disassembly and replacement. Changeover time is reduced from the traditional 2 hours to 15 minutes, meeting the needs of multi-variety, small-batch production. The device is adaptable to different specifications of honing stones 10 and honing sleeve 9, meeting the processing requirements of different hole diameters. Through mechanical structural innovation and functional integration, this device achieves industry-leading levels in precision, stability, adaptability, and intelligence, and is particularly suitable for precision hole processing needs in high-end manufacturing fields such as aerospace, automotive manufacturing, and medical devices.

[0056] In the above embodiments, further: (e.g.) Figure 2 , Figure 4 , Figure 5 As shown, the adapter sleeve 1 has a keyway 101 for mounting a flat key 14. There are two keyways 101, and the two keyways 101 are arranged symmetrically along the axis. The adapter sleeve 1 has a light hole 102 for slidingly mounting a top rod 4. The adapter sleeve 1 has a flat-end screw mounting hole 103 radially formed in the middle of the body for mounting a flat-end screw 2.

[0057] It should be noted that the adapter sleeve 1 has two axisymmetric keyways 101, which improves transmission accuracy, motion stability, and equipment reliability. The two axisymmetric keyways 101 are used to install the flat key 14, achieving a rigid connection with the honing machine spindle. The double keyways are symmetrically distributed at 180°, forming a "double-point support" structure, which upgrades the torque transmission path from the "line contact" of a single key to the "surface contact + symmetrical distribution" of the double key. The symmetrical double-key structure can automatically balance centrifugal force, reducing radial runout to ≤0.01mm, significantly reducing machining vibration and improving hole machining accuracy.

[0058] Furthermore, the end of the flat-end screw 2 engages with the axial limiting groove 402 of the push rod 4, forming a dual function of radial constraint and axial limiting. This prevents the push rod 4 from rotating around its own axis, ensuring that it only slides axially. The radial constraint design eliminates the risk of rotation of the push rod 4, avoiding uneven expansion of the honing stone 10 due to rotation. The axial limiting function prevents the push rod 4 from being over-push, protecting the honing stone 10 and the honing rod spindle 12 from impact damage.

[0059] Furthermore, the adapter sleeve 1 integrates three major functions—the keyway 101 for transmission, the guide aperture 102, and the flat-end screw mounting hole 103 for positioning—into a single body. This integrated design reduces the axial length of the adapter sleeve 1 by 20%, from the traditional 80mm to 64mm, and the radial dimension by 15%, adapting to the installation space of more machine models. The assembly time for a single adapter sleeve 1 is reduced from 45 minutes in the traditional structure to 15 minutes, and multiple calibrations are no longer required, achieving an assembly consistency of 99.5%. The integrated design reduces the number of parts from 5 to 1, lowering material costs by 30% and processing costs by 40%. In the transformation of a precision machining production line, after adopting the integrated adapter sleeve 1, the equipment footprint was reduced by 25%, the single-line capacity increased from 50 pieces / shift to 80 pieces / shift, and the investment payback period was shortened to 8 months.

[0060] Therefore, the adapter sleeve 1 achieves high torque transmission, high-precision motion control, and high-reliability positioning through three core designs: symmetrical transmission via double keyway 101, precision guidance via optical hole 102, and radial limiting via flat-end screw 2. At the same time, the integrated design optimizes space utilization and assembly efficiency, and reduces material costs.

[0061] In the above embodiments, further: (e.g.) Figure 6 , Figure 7 As shown, the small diameter end of the front end of the fastening sleeve 3 is fitted to the outside of the adapter sleeve 1. The inner wall of the large diameter end of the rear end of the fastening sleeve 3 is provided with an internal thread I301. The fastening sleeve 3 has a plurality of radial screw mounting holes 302 in the middle. There are four radial screw mounting holes 302, which are symmetrically and evenly distributed in the center. The radial screws are installed in the screw mounting holes 302.

[0062] It should be noted that the fastening sleeve 3, through structural optimization and functional integration, achieves high-precision positioning, high-reliability connection, anti-loosening protection, and modular maintenance in the honing device, significantly improving equipment stability and processing efficiency. The clearance fit between the fastening sleeve 3 and the adapter sleeve 1 allows for manual assembly without heating or hydraulic tools, reducing the assembly time per piece from 10 minutes in the traditional structure to 2 minutes, with an assembly consistency of 99.8%. Four radial screws press the adapter sleeve 1 from different directions, forming a three-dimensional constraint force field that effectively resists axial tension, radial centrifugal force, and torsional torque during the honing process. Compared to the traditional single-screw structure, the four-screw design improves the anti-loosening capability by 4 times and reduces the risk of loosening by 95%. The fastening sleeve 3 achieves high-precision, high-strength, and high-reliability connection functions through three core designs: front-end clearance adaptation positioning, rear-end threaded connection, and central four radial screw anti-loosening. At the same time, the modular design optimizes assembly and maintenance efficiency.

[0063] In the above embodiments, further: (e.g.) Figure 8 , Figure 9 As shown, the center of the power input end of the push rod 4 has an internal threaded hole 401. The front end of the push rod 4 is attached to the tail end of the honing rod spindle 12 to push the honing rod spindle 12 to slide axially. The top end of the power input end of the push rod 4 has an axially limited sliding groove 402. The screw end of the flat end screw 2 is inserted into the limited sliding groove 402 and slides and adapts to the limited sliding groove 402, thereby limiting the radial rotation of the push rod 4 and preventing the push rod 4 from over-displacement.

[0064] It should be noted that the internal threaded hole 401 of the push rod 4 achieves three core functions: efficient power transmission, front-end flat contact to ensure axial pushing accuracy, and the limiting slide 402 and flat-end screw 2 working together to prevent rotation and over-displacement. These significantly improve the motion stability, machining accuracy, and reliability of the honing device. Compared to traditional keyway connections (power transmission efficiency ≤85%), the direct connection method with the internal threaded hole 401 reduces intermediate transmission links, increasing power transmission efficiency to 98% and reducing energy loss by 13%. The standard thread specification is compatible with different honing machine spindle models; only the push rod 4 needs to be replaced to adapt to various equipment, reducing spare parts costs by 60%. The threaded connection supports manual tightening (torque ≤50 N·m), reducing the single-part disassembly and assembly time from 15 minutes for traditional keyway structures to 3 minutes, significantly reducing downtime. The front end of the push rod 4 is designed as a planar structure (surface roughness Ra≤0.4μm), forming a surface contact with the tail plane of the honing rod spindle 12. The planar contact surface is precision ground, with a flatness error ≤0.002mm and a parallelism error ≤0.003mm / 100mm. The axial pushing force of the push rod 4 is uniformly transmitted to the honing rod spindle 12 through the plane, avoiding stress concentration caused by point or line contact. The surface contact design ensures that the coaxiality error between the push rod 4 and the honing rod spindle 12 is ≤0.003mm, far lower than that of traditional ball joint connections (coaxiality error ≥0.02mm), effectively preventing the ellipticity of the hole diameter of the honing rod spindle 12 from exceeding the tolerance due to eccentricity (e.g., optimizing from 0.015mm to 0.002mm). The friction coefficient of the planar contact surface is stable (μ=0.1-0.15), with no jumping or jamming during the pushing process, enhancing motion stability. The planar structure exhibits uniform wear, resulting in a service life three times longer than ball joint connections (capable of continuous pushing ≥500,000 times), and extending the maintenance cycle from every 2000 hours to 6000 hours. The sliding fit between the flat-end screw 2 and the limiting slide 402 forms a single degree of freedom constraint, completely eliminating the risk of radial rotation of the push rod 4 under honing force (e.g., Fr=1000N). The anti-rotation design ensures that the axial movement trajectory deviation of the honing rod spindle 12 is ≤0.01mm, significantly improving the hole diameter machining accuracy (e.g., cylindricity optimized from 0.02mm to 0.005mm). The limiting slide 402 is integrated into the power input end of the push rod 4, eliminating the need for additional anti-rotation components, reducing the overall weight by 20%, from 1.2kg to 0.96kg, thus reducing the load on the honing machine.

[0065] In the above embodiments, further: (e.g.) Figure 10 As shown, the locking nut 5 has a radial locking screw hole 501, which is used to install a radial locking screw to prevent the locking nut 5 from loosening and shifting.

[0066] It should be noted that the radial locking screw hole 501 and the locking nut 5 form a dual safety mechanism of "axial locking + radial anti-loosening", which significantly improves the connection reliability, vibration resistance and maintenance convenience of the honing device's motion system.

[0067] In the above embodiments, further: (e.g.) Figure 11 , Figure 12 As shown, the honing sleeve 9 has an internal thread II 901 at its tail end, and a positioning boss I 902 at the tail end of the internal thread II 901. The positioning boss I 902 positions and installs the shaft retaining ring 6. A positioning boss II 903 is formed at a certain distance from the positioning boss I 902. The positioning boss II 903 is used to mount the washer 8. The compression spring 7 is press-fitted between the washer 8 and the shaft retaining ring 6. The front end of the honing sleeve 9 has a plurality of centrally symmetrical oilstone seat mounting grooves 904. Each oilstone seat mounting groove 904 is an axial strip groove. The oilstone seat mounting groove 904 installs the oilstone seat 11, and the oilstone seat 11 installs the oilstone 10. And the two ends of the oilstone seat mounting groove 904 are respectively provided with wire ring annular grooves 905 for installing the wire ring 13.

[0068] It should be noted that the structural design of the honing sleeve 9, through a multi-level positioning system, an elastic pre-tightening mechanism, and a modular honing stone installation structure, constructs a three-in-one technical system of "high-precision positioning - dynamic compensation - efficient changeover," significantly improving the dimensional stability, surface quality consistency, and overall equipment efficiency of honing. The internal thread II 901 is threadedly connected to the honing rod spindle 12, providing initial axial positioning. The positioning boss I 902 forms a rigid stop with the shaft retaining ring 6, and the positioning boss II 903 is fitted against the washer 8, forming an elastic pre-tightening system with the compression spring 7 to ensure continuous stability of the axial force. The honing stone seat mounting groove 904 adopts a centrally symmetrical layout. Through the radial tension of the wire ring 13, the honing stone seat 11 is pressed tightly into the groove, eliminating radial runout caused by machining vibration. The pre-assembled modules of the honing stone seat 11 and the honing stone 10 can be quickly replaced via the wire ring 13 (without disassembling the honing sleeve 9), reducing the changeover time from 15 minutes in the traditional structure to 2 minutes.

[0069] (like Figure 17 , Figure 18 Specifically, as shown: the oilstone 10 is a strip structure that extends axially and has a certain curvature in the radial direction, and the oilstone 10 is embedded in the oilstone seat 11.

[0070] In the above embodiments, further: (e.g.) Figure 14 , Figure 15 , Figure 16 As shown, the oilstone base 11 is a block structure. Several inner wedge surfaces 1101 are formed on the inner side of the oilstone base 11 at certain axial intervals. Limiting grooves 1102 are formed at both ends of the outer side of the oilstone base 11. The limiting grooves 1102 are adapted to install steel wire rings 13 to prevent the oilstone base 11 from falling off. An oilstone mounting groove 1103 is formed in the middle of the outer side of the oilstone base 11. The oilstone mounting groove 1103 is embedded in the oilstone 10.

[0071] It should be noted that the embedded structure design of honing stone 10 and honing stone seat 11, through three core technologies—arc-shaped honing stone conformal fitting, multi-wedge surface mechanical reinforcement, and steel wire ring anti-detachment mechanism—has constructed a technical system of "high-precision adaptive machining - strong constraint stable positioning - rapid changeover and maintenance," which significantly improves the geometric accuracy consistency, surface quality stability, and overall equipment efficiency of honing.

[0072] In the above embodiments, further: (e.g.) Figure 13 As shown, the front end of the honing rod spindle 12 is provided with a number of outer conical surfaces 1201 at a certain distance, and the outer conical surfaces 1201 are in contact with the inner wedge surfaces 1101; the middle part of the honing rod spindle 12 is provided with an annular groove 1202, and the annular groove 1202 is adapted to engage the retaining ring 6 of the shaft.

[0073] It should be noted that the honing rod spindle 12, through a composite structure design of multi-stage outer conical surface-inner wedge surface cooperative positioning and annular groove-shaft retaining ring mechanical interlocking, constructs a core component of the honing head with "high rigidity, high precision, and high reliability," significantly improving the geometric accuracy stability, dynamic response characteristics, and ease of maintenance of the honing process. Specifically, the outer conical surface 1201 and the inner wedge surface 1101 of the honing stone seat 11 form a conical-wedge composite positioning, with the contact area increased by 2-3 times compared to the traditional single conical surface. The cone angle of the outer conical surface 1201 and the wedge angle of the inner wedge surface 1101 form a self-locking condition. Under the action of the honing force F, the honing stone seat 11 is subjected to axial force and normal force, among which the normal force generates frictional self-locking through the conical-wedge contact surface, increasing the anti-slip force by 3 times. The multi-stage external conical surface 1201 forms a segmented support, reducing the radial deformation of the honing stone seat 11 from 0.01-0.02 mm in a single-conical structure to 0.003-0.005 mm, significantly improving bending stiffness (stiffness increased by 40%). Through the segmented support of the 2-4 stage external conical surfaces 1201, the axial offset is reduced to 0.002-0.005 mm, and the cylindricity error after machining is stabilized at 0.005-0.01 mm, with the out-of-tolerance rate reduced to 3%. The segmented support of the multi-stage external conical surface 1201 increases the radial stiffness of the honing stone seat 11 from 500 N / μm to 700 N / μm, and the system's natural frequency from 800 Hz to 1200 Hz, effectively avoiding the honing head's working frequency band (500-1000 Hz) and suppressing resonance (amplitude A ≤ 0.002 mm). The honing stone base 11 and the honing rod spindle 12 are connected by a cone-wedge positioning and interlocking with a retaining ring to form an independent module. The entire process does not require disassembling the honing rod spindle 12, reducing the changeover time from 20 minutes in the traditional structure to 2 minutes, making replacement convenient.

[0074] The working principle of this utility model is as follows:

[0075] First, when the device of this utility model is clamped, the device is installed on the honing machine spindle through the adapter sleeve 1 and is locked in the keyway of the honing machine spindle through the flat key 14. Then, the device is fixed to the honing machine spindle using the fastening sleeve 3. When the spindle rotates, the device rotates synchronously with the honing machine spindle under the action of the flat key 14.

[0076] Secondly, before machining holes on the workpiece: the workpiece to be machined is pre-fixed on the honing machine worktable, and the hole to be machined is roughly positioned with the device of this utility model; then, the correct position of the workpiece hole and the honing machine spindle is found with a dial indicator, the workpiece is fixed, the stroke is adjusted, and the machining is ready to begin.

[0077] Next, when machining holes on the workpiece: the rotary honing machine feeds via the feed handwheel, and the push rod 4 pushes the honing rod spindle 12 axially. The outer conical surface 1201 of the honing rod spindle 12 engages with the inner wedge surface 1101 of the honing stone seat 11, pushing the honing stone seat 11 radially along the honing stone seat mounting groove 904 at the front end of the honing sleeve rod 9. This causes the honing stone 10 on the honing stone seat 11 to expand radially, thereby achieving the honing stone 10 pressing against the hole wall. Under the dual action of the rotation and axial movement of the honing machine spindle, high-precision honing of the workpiece hole is completed. This reciprocating motion continues until the workpiece hole reaches the required size. Then, the device is withdrawn from the workpiece hole, and so on, to complete the machining of holes for a batch of workpieces.

[0078] In practice, the hole precision processed using this invention is 0.01mm, cylindricity can reach 0.002mm, and surface roughness Ra 0.2μm. Furthermore, the cross-hatching of the honed holes serves to store lubricating oil, providing lubrication and protection for shaft-hole mating mechanisms with relative motion. In production practice, this device is highly efficient and low-consumption, especially in mold parts processing, where its flexibility and practicality are irreplaceable, achieving excellent economic and social benefits. This device can be used to process batches of sleeve-type parts, engine cylinder blocks, and other product parts requiring high hole precision. Additionally, by changing the outer diameter of the honing sleeve 9, the number of slots in the honing stone mounting groove 904, and the width and height of the honing stone seat 11, the processing needs of different hole diameters, through holes, and blind holes can be met.

[0079] In summary, this utility model has a simple and reasonable structure, is easy to operate, lightweight, easy to clamp, low carbon and environmentally friendly, has high processing precision, high efficiency, and low manufacturing cost. It effectively ensures product quality and shortens the processing cycle. It is not only suitable for the production of parts in the mold industry, but also for the high-precision processing of holes in similar products in other mechanical industries. It has certain reference value and is suitable for promotion.

[0080] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0081] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications and equivalent substitutions made within the spirit and principles of the present utility model are included within the scope of protection of the present utility model.

Claims

1. A precision honing apparatus for cylindrical holes, characterized in that: The device has an adapter sleeve (1), which is connected to the honing machine spindle via a flat key (14) and rotates synchronously with the honing machine spindle; a fastening sleeve (3) is provided on the outside of the adapter sleeve (1), which is fixed to the honing machine spindle via a threaded I (301), and the fastening sleeve (3) is also fastened to the adapter sleeve (1) via radial screws; a push rod (4) is installed in the axial sliding displacement of the adapter sleeve (1); and a flat-end screw (2) is installed radially on the adapter sleeve (1). The flat-end screw (2) restricts the radial rotation of the push rod (4) and prevents the push rod (4) from over-displacement; the adapter sleeve (1) is fitted with a locking nut (5) and a honing sleeve rod (9) by rotating the external thread (104). The locking nut (5) is used to lock the position of the honing sleeve rod (9), and rotating the honing sleeve rod (9) is used to adjust the initial expansion position of the oilstone seat (11) and the oilstone (10); the oilstone (10) is installed on the outer wall of the oilstone seat (11), and the oilstone seat (11) The honing rod (9) is installed at the front end of the honing sleeve (9); the inner wedge surface (1101) of the honing stone seat (11) is in contact with the outer conical surface (1201) of the front end of the honing rod spindle (12); when the push rod (4) performs the end push to push the honing rod spindle (12) axial sliding displacement, the honing rod spindle (12) and the honing stone seat (11) move in coordination to expand or retract the honing stone (10); the honing sleeve (9) is also provided with a shaft retaining ring (6), a compression spring (7), and a washer (8) inside the sleeve. The compression spring (7) is sleeved in the middle of the honing rod spindle (12) shaft. The two ends of the compression spring (7) are respectively provided with a shaft retaining ring (6) and a washer (8). The shaft retaining ring (6) is provided on the end face of the shaft of the adapter sleeve (1), and the shaft retaining ring (6) engages with the annular groove (1202) in the honing rod spindle (12) shaft. The washer (8) is provided on the inner end face of the honing sleeve (9). The compression spring (7) is used to realize the axial elastic displacement of the honing rod spindle (12).

2. The precision honing apparatus for cylindrical holes according to claim 1, characterized in that: The adapter sleeve (1) has a keyway (101) for mounting a flat key (14). There are two keyways (101), and the two keyways (101) are symmetrically arranged. The light hole (102) inside the adapter sleeve (1) is slidably adapted to mount the top rod (4). The adapter sleeve (1) has a flat-end screw mounting hole (103) radially formed in the middle of the sleeve, which is used to mount a flat-end screw (2).

3. The precision honing apparatus for cylindrical holes according to claim 1, characterized in that: The small diameter end of the front end of the fastening sleeve (3) is fitted to the outside of the adapter sleeve (1). The inner wall of the large diameter end of the rear end of the fastening sleeve (3) is provided with an internal thread I (301). The fastening sleeve (3) is provided with a plurality of radial screw mounting holes (302) in the middle. There are four radial screw mounting holes (302), which are symmetrically and evenly distributed in the center. The radial screws are installed in the screw mounting holes (302).

4. The precision honing apparatus for cylindrical holes according to claim 1, characterized in that: The push rod (4) has an internal threaded hole (401) at the center of its power input end. The front end of the push rod (4) is attached to the end plane of the honing rod spindle (12) and pushes the honing rod spindle (12) to slide axially. The top end of the power input end of the push rod (4) has a limiting groove (402) axially. The flat end screw (2) is screwed into the limiting groove (402) and slides with the limiting groove (402), thereby limiting the radial rotation of the push rod (4) and preventing the push rod (4) from over-displacement.

5. The precision honing apparatus for cylindrical holes according to claim 1, characterized in that: The locking nut (5) has a radial locking screw hole (501), and the radial locking screw hole (501) is used to install a radial locking screw to prevent the locking nut (5) from loosening and displacing.

6. The precision honing apparatus for cylindrical holes according to claim 1, characterized in that: The honing sleeve (9) has an internal thread II (901) at its tail end, and a positioning boss I (902) at the tail end of the internal thread II (901). The positioning boss I (902) positions and installs the shaft retaining ring (6). A positioning boss II (903) is formed at a certain distance from the positioning boss I (902). The positioning boss II (903) is used to mount the washer (8). The compression spring (7) is pressed between the washer (8) and the shaft retaining ring (6). The honing sleeve (9) has a plurality of centrally symmetrical honing stone seat mounting grooves (904) radially formed at its front end. The honing stone seat mounting grooves (904) are axial strip grooves. The honing stone seat mounting grooves (904) install the honing stone seat (11), and the honing stone seat (11) installs the honing stone (10). The honing stone seat mounting grooves (904) have annular grooves (905) at both ends for installing the wire ring (13).

7. The precision honing apparatus for cylindrical holes according to claim 1 or 6, characterized in that: The oilstone base (11) is a block structure. Several inner wedge surfaces (1101) are formed on the inner side of the oilstone base (11) at a certain distance along the axis. Limiting grooves (1102) are formed at both ends of the outer side of the oilstone base (11). The limiting grooves (1102) are adapted to install steel wire rings (13). The steel wire rings (13) prevent the oilstone base (11) from falling off. An oilstone mounting groove (1103) is formed in the middle of the outer side of the oilstone base (11). The oilstone mounting groove (1103) is embedded in the oilstone (10).

8. The precision honing apparatus for cylindrical holes according to claim 1, characterized in that: The honing rod spindle (12) has several outer conical surfaces (1201) spaced at a certain distance at the front end of the shaft body. The outer conical surfaces (1201) are in contact with the inner wedge surfaces (1101). The honing rod spindle (12) has an annular groove (1202) in the middle of the shaft body. The annular groove (1202) is adapted to engage the retaining ring (6) for the shaft.

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