Cylinder part precision honing in-place finishing device and method

Abstract

The invention discloses a cylinder part precision honing in-place finishing device and method. The cylinder part precision honing in-place finishing device comprises a machine tool base, and a cylinder part is installed on the upper surface of the machine tool base through a positioning clamp; the transmission system corresponds to the cylinder part; the multi-oilstone honing head is connected to the output end of the transmission system; the ball screw type linear module is arranged in the vertical direction relative to the machine tool base and is connected with the high-precision displacement control system; the honing dresser is mounted on the ball screw type linear module and is arranged corresponding to the multi-oilstone honing head; a displacement measuring unit is arranged on the ball screw type linear module and used for measuring the spatial position of the honing trimmer. The multi-oilstone honing head in-place coaxial finishing device achieves in-place coaxial finishing of multiple oilstone honing heads, avoids positioning errors caused by disassembly and assembly, has the advantages of being high in reliability, high in finishing precision, good in repeatability, low in dependence on skills of operators and the like, and is suitable for industrial honing finishing of high-precision cylinder parts.

Description

An in-situ finishing device and method for precision honing of cylindrical parts Technical Field

[0001] This invention relates to the field of precision honing technology for internal holes, and in particular to an in-situ finishing device and method for precision honing of cylindrical parts. Background Technology

[0002] Large aspect ratio bore parts, such as aircraft landing gear actuators and servo valve sleeves, have important applications in aerospace, precision instruments, and high-end equipment manufacturing. The machining accuracy of their internal holes is a key factor affecting the fit clearance, operational stability, and response time of assembled components. In honing, a honing stone expands and contracts radially against the surface of the bore to be machined. The honing head rotates and reciprocates linearly relative to the workpiece to remove material, offering advantages such as high internal hole accuracy and good surface quality. Therefore, honing is a crucial process for ensuring high-precision machining of large aspect ratio bore parts. In honing, the final machining accuracy and surface quality of the workpiece's internal hole are mainly constrained by the accuracy of the outer cylindrical profile formed by the honing stone assembly and the cutting performance of the honing stone itself. The improvement of the outer cylindrical profile accuracy formed by the honing stone assembly is affected by manufacturing errors in the honing head body, honing stones, and other components, as well as accumulated assembly errors, making it difficult for the honing head to directly achieve a high cylindricity in its initial assembled state. Furthermore, uneven wear of the honing stone during machining will further affect the geometric accuracy of its outer cylindrical profile and the cutting performance of the honing stone. Therefore, regular precision dressing of the honing head is a key technical step to compensate for manufacturing and assembly errors, reconstruct the high cylindricity of the honing head, and maintain the high cutting performance of the honing stone.

[0003] Existing honing head cylindricity dressing techniques mainly include two approaches: online dressing and offline dressing. Online dressing typically relies on skilled operators using experience to manually hold coarse-grained honing stones or small dressing devices to grind and correct the honing stones. This method is only suitable for simple maintenance of the honing stone cutting edge during honing or restoring the cutting edge after clearing blockages, but it is difficult to ensure the cylindricity and other geometric accuracy of the honing head. Offline dressing mainly involves disassembling the honing stone assembly and using a special fixture to perform calibration on an external grinding machine. However, special fixtures are expensive, and uneven assembly stress may lead to localized over-dressing. Furthermore, reassembly and disassembly can easily accumulate installation errors. To address the shortcomings of offline honing stone dressing, patent CN206084728U discloses an "online honing stone dressing device." This device uses a crescent-shaped dresser mounted on a workpiece mounting bracket, applying dressing pressure to the honing head radially. A motor-driven gear-rack transmission adjusts the crescent-shaped dresser's axial movement along the honing head, achieving in-situ honing stone dressing. However, this method requires a fixed connection between the honing rod and the machine tool output shaft. In honing large aspect ratio components like landing gear cylinders, the honing rod and output shaft are typically connected by a universal joint, making this method unsuitable. Furthermore, the honing rod is prone to bending and deformation under the dresser's pressure, reducing the honing head's dressing accuracy. Additionally, the crescent-shaped dresser cannot completely enclose the honing head, forming only a limited contact arc length, which can lead to localized load concentration and increased vibration, further reducing the honing stone's dressing accuracy.

[0004] Therefore, there is an urgent need to develop an in-situ dressing method and device for precision honing of cylindrical parts, in order to meet the dressing requirements of high cylindricity of multi-oilstone honing heads and high cutting performance of oilstones in the internal honing process, and to achieve efficient and high-precision honing of cylindrical parts. Summary of the Invention

[0005] The purpose of this invention is to provide an in-situ finishing device and method for precision honing of cylindrical parts, so as to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: The present invention provides an in-situ finishing device for precision honing of cylindrical parts, comprising: a machine tool base, serving as the overall support foundation and installation reference for the device; a positioning fixture, which is installed on one side of the top of the machine tool base for positioning and clamping the cylindrical part; a transmission system, which is installed on the top of the machine tool base and arranged correspondingly to the cylindrical part; a honing rod support frame, which is fixedly installed on the machine tool base and located between the transmission system and the positioning fixture; a multi-oil honing head, which is detachably connected to the output end of the transmission system; and a ball screw type linear module, wherein the ball screw... A ball screw-type linear module is mounted on the middle reference surface of the machine tool base, located between the positioning fixture and the honing rod support frame, and spatially adjacent to the positioning fixture. The ball screw-type linear module is arranged vertically relative to the machine tool base and connected to a high-precision displacement control system. A honing dresser is mounted on the ball screw-type linear module and is arranged correspondingly to the multi-oil stone honing head. A displacement measuring unit is installed on the ball screw-type linear module to measure the spatial position of the honing dresser, ensuring that the rotation axis of the honing dresser and the multi-oil stone honing head mounted on the transmission system are coaxially aligned.

[0007] According to the present invention, a precision honing and in-situ dressing device for cylindrical parts is provided. The positioning fixture includes: a part base, the part base being fixed to the top surface of a machine tool base; a plurality of V-shaped positioning blocks, the plurality of V-shaped positioning blocks being arranged at equal intervals along the length direction of the part base, the cylindrical part being placed in the positioning groove of the V-shaped positioning block; a plurality of clamping assemblies, the plurality of clamping assemblies being arranged corresponding to the V-shaped positioning blocks, each clamping assembly including a chain and a chain fixing pin, the chain straddling the outer periphery of the cylindrical part to form a limiting fit, the two ends of the chain being respectively locked to the V-shaped positioning block by the chain fixing pin; according to the present invention, the transmission system includes: a reciprocating feed drive servo motor, the reciprocating feed drive servo... A motor is horizontally mounted on the top surface of the machine tool base; a rotary drive servo motor is mounted next to the reciprocating feed drive servo motor; a honing rod, one end of which is connected to the output shaft of the rotary drive servo motor, and the other end is detachably connected to the multi-oilstone honing head via a honing head connecting rod; according to the present invention, a precision honing in-situ dressing device for cylindrical parts is provided, wherein the multi-oilstone honing head includes: a grinding head body, the grinding head body having a cylindrical structure, and the outer wall of the grinding head body having a plurality of radial grooves uniformly formed along the circumference; a top cone, the top cone being coaxially and slidably assembled in the inner cavity of the grinding head body, the top cone having a frustum-shaped structure, and the bottom of the oilstone seat abutting against the outer conical surface of the top cone to convert the axial movement of the top cone into the radial expansion movement of the oilstone seat.

[0008] A plurality of sets of honing stone seats, the plurality of sets of honing stone seats being supported by the top cone and arranged in the radial groove of the grinding head body; a honing stone, the honing stone being fixedly embedded in the outer top of the honing stone seat; according to the present invention, a precision honing in-situ dressing device for cylindrical parts is provided, wherein a connecting sleeve is installed at the end of the grinding head body, and the connecting sleeve is detachably connected to the end of the honing rod.

[0009] According to the present invention, a precision honing in-situ dressing device for cylindrical parts is provided. The ball screw type linear module includes: a base, the base being fixed to the top of a machine tool base, and a front end plate and a rear end plate symmetrically mounted on the top surface of the base; two sets of linear guides, the two sets of linear guides being symmetrically fixed to the top of the base; and a slide, the bottom of which is symmetrically mounted with a plurality of sliders, the sliders having a clearance-free fit with the linear guides below, and ball nuts being provided in the geometrically intermediate region between the two sets of sliders. The ball nut is fixed to the bottom of the slide table by a flange; the drive assembly includes a servo motor fixed to the outside of the rear end plate, a ball screw rotatably mounted between the front end plate and the rear end plate, and a ball nut fixed to the bottom of the slide table; the output shaft of the servo motor is drivenly connected to one end of the ball screw via a coupling, and the ball screw and the ball nut mesh to form a precision transmission pair; according to the present invention, a precision honing and dressing device for cylindrical parts is provided, the honing and dressing device includes: a split bearing housing, The split bearing housing is fixedly installed on the upper plane of the slide table. The split bearing housing has a highly coaxial sleeve assembly hole machined inside, and a circumferential anti-rotation key block is provided on the inner cylindrical surface of the sleeve assembly hole. Two threaded holes are symmetrically machined on the top surface of the split bearing housing near its side edge. The dresser body includes a sleeve, an abrasive layer, and a consolidation layer. A positioning keyway is precisely machined axially on the outer cylindrical surface of the sleeve to achieve a clearance-free fit with the circumferential anti-rotation key block of the split bearing housing. The sleeve is interference-fitted. The abrasive layer is installed inside the split bearing housing; the abrasive layer is manufactured by electroplating or brazing; the inner surface of the sleeve and the outer surface of the abrasive layer are firmly bonded by the bonding layer; bolts are screwed into the threaded holes of the split bearing housing, and by applying assembly torque, the elastic deformation of the split bearing housing generates a radial clamping force pointing towards the axis to fasten the dresser body; according to the present invention, a precision honing in-situ dressing device for cylindrical parts is provided, wherein the displacement measuring unit includes a grating ruler, and the grating ruler is mounted on the slide table.

[0010] A method for precision honing and in-situ dressing of cylindrical parts includes the following steps: S1. A high-precision displacement control system drives a ball screw-type linear module. The displacement of the ball screw-type linear module is detected in real time by a displacement measurement unit, thereby precisely adjusting the spatial position of the honing dresser until the coaxiality error between the honing dresser and the rotation axis of the multi-oil stone honing head on the transmission system reaches the allowable range, achieving precise automated alignment; S2. The multi-oil stone honing head is inserted axially into the inner hole of the honing dresser. According to the parameters and target accuracy of the multi-oil stone honing head, the radial expansion of the multi-oil stone honing head is controlled to be uniform until the working surface of the honing stone is reached. S2-S3: Establish effective contact with the inner wall of the honing dresser and maintain stable radial pressure; S4: Drive the multi-stone honing head to perform reciprocating rotary compound motion in the honing dresser hole according to the preset dressing process parameters, so that the outer circle contour formed by the combination of honing stones approaches the high-precision geometry of the honing dresser reference surface, so as to reconstruct its high-precision cylindricity reference and maintain the high cutting performance of the honing stones; S5: After the dressing cycle is completed, test process the workpiece, check the cylindricity of the workpiece, iteratively adjust the parameters according to the test results and repeat steps S2-S3 until the cylindricity of the honing head meets the standard; S6: After confirming that the cylindricity of the honing head meets the accuracy requirements, the dressing process is completed.

[0011] This invention discloses the following technical advantages: By employing a high-precision displacement control system, the feed displacement of the ball screw-type linear module is precisely controlled, ensuring that the coaxiality error between the honing dresser and the rotating axis of the multi-oil stone honing head to be dressed meets design requirements. This allows for coaxial in-situ dressing of the honing head on a honing machine. Compared to existing online and offline dressing methods, this method achieves in-situ dressing of the honing head without the need for disassembly and assembly, significantly reducing dressing time and fundamentally eliminating repetitive positioning errors caused by repeated disassembly and assembly. This method offers advantages such as high dressing accuracy, good process consistency, and low dependence on operator skills during the dressing process, making it suitable for high-precision industrial honing dressing.

[0012] Compared to existing honing head dressers and methods, this invention offers higher dressing accuracy, process stability, and dressing consistency. It enables high-precision dressing of the cylindricity of honing heads, ensuring high cylindricity of the outer profile formed by the honing stone assembly and high cutting performance of the honing stones after dressing. This significantly shortens the honing head dressing cycle and improves the efficiency of cylindricity dressing, providing reliable support for industrial and automated applications. In long-term use, this invention also exhibits higher geometric accuracy retention, dressing reliability, and a longer service life. Therefore, this invention can provide crucial process assurance for the high service performance of key cylindrical components in high-end equipment such as aerospace and precision instruments. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 is a schematic diagram of the dressing principle of the multi-oil stone honing head of the present invention; Figure 2 is a schematic diagram of the overall structure assembly of the honing head in-situ dressing device of the present invention; Figure 3 is a schematic diagram of the structure of the honing head in-situ dresser of the present invention; Figure 4 is a schematic diagram of the structure of the multi-oil stone honing head of the present invention; Figure 5 is a schematic diagram of the structure of the honing dresser of the present invention; Figure 6 is a schematic diagram of the structure of the ball screw type linear module of the present invention; Figure 7 is a flowchart of the precision honing in-situ dressing process for cylindrical parts of the present invention.

[0015] Among them, 1. Rotary drive servo motor; 2. Reciprocating feed drive servo motor; 3. Honing rod; 4. Honing head connecting rod; 5. Honing rod support frame; 6. Multi-oilstone honing head; 7. Machine tool base; 8. Ball screw type linear module; 9. Honing dresser; 10. Cylindrical parts; 11. Chain; 12. Chain fixing pin; 13. V-shaped positioning block; 14. Part base; 61. Oilstone; 62. Oilstone seat; 63. Top cone; 64. Grinding head body; 65. Connecting sleeve; 81. 81. Servo motor; 82. Rear end plate; 83. Coupling; 84. Rear bearing housing; 85. Rear bearing; 86. Partition plate; 87. Ball screw; 88. Flange; 89. Ball nut; 810. Grating ruler; 811. Linear guide; 812. Slider; 813. Slide table; 814. Front end plate; 815. Front bearing housing; 816. Base; 817. Front bearing; 91. Abrasive layer; 92. Consolidation layer; 93. Sleeve; 94. Split bearing housing; 95. Bolt. Detailed Implementation

[0016] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0018] Referring to Figures 1-7, this invention provides an in-situ finishing device for precision honing of cylindrical parts, comprising: a machine tool base 7, serving as the overall support foundation and installation reference for the device; a positioning fixture, installed on one side of the top of the machine tool base 7, for positioning and clamping the cylindrical part 10; a transmission system, installed on the top of the machine tool base 7 and arranged corresponding to the cylindrical part 10; a honing rod support frame 5, fixedly installed on the machine tool base 7 and located between the transmission system and the positioning fixture; a multi-oil stone honing head 6, detachably connected to the output end of the transmission system; and a ball screw type linear module 8. 8 is installed on the middle reference surface of the machine tool base 7, located between the positioning fixture and the honing rod support frame 5, and spatially adjacent to the positioning fixture; the ball screw type linear module 8 is arranged vertically relative to the machine tool base 7 and connected to the high-precision displacement control system; the honing dresser 9 is installed on the ball screw type linear module 8 and is arranged correspondingly to the multi-oil stone honing head 6; wherein, a displacement measuring unit is installed on the ball screw type linear module 8, the displacement measuring unit is used to measure the spatial position of the honing dresser 9, ensuring that the rotation axis of the honing dresser 9 and the multi-oil stone honing head 6 installed on the transmission system are coaxially aligned.

[0019] Further optimized, the positioning fixture includes: a part base 14, which is fixed to the top surface of the machine tool base 7; several sets of V-shaped positioning blocks 13, which are evenly spaced along the length of the part base 14, with the cylindrical part 10 placed in the positioning groove of the V-shaped positioning block 13; several sets of clamping assemblies, which are respectively arranged corresponding to the V-shaped positioning blocks 13, each clamping assembly including a chain 11 and a chain fixing pin 12, the chain 11 straddling the outer periphery of the cylindrical part 10 to form a limiting fit, and both ends of the chain 11 being locked to the V-shaped positioning blocks 13 by the chain fixing pins 12; further optimized, the transmission system includes: a reciprocating feed drive servo motor 2, which is horizontally mounted on the top surface of the machine tool base 7; a rotary drive servo motor 1, which is mounted next to the reciprocating feed drive servo motor 2; and a honing rod 3, which is used for honing... One end of rod 3 is connected to the output shaft of the rotary drive servo motor 1, and the other end is detachably connected to the multi-oilstone honing head 6 via the honing head connecting rod 4; the reciprocating feed drive servo motor 2 provides axial reciprocating motion to the honing rod 3 and the multi-oilstone honing head 6 through a transmission mechanism, realizing full-stroke coverage of the inner wall of the cylindrical part 10 by the honing stone 61; the output end of the rotary drive servo motor 1 is rigidly coaxially connected to the honing rod 3, driving the honing rod 3 and the multi-oilstone honing head 6 to perform circumferential rotational motion; The optimized solution for the multi-oil honing head 6 includes: a grinding head body 64, which has a cylindrical structure and a plurality of radial grooves evenly formed on the outer wall of the grinding head body 64 along the circumference; and a top cone 63, which is coaxially and slidably assembled in the inner cavity of the grinding head body 64. The top cone 63 has a frustum-shaped structure, and the bottom of the oilstone seat 62 abuts against the outer conical surface of the top cone 63 to convert the axial movement of the top cone 63 into the radial expansion movement of the oilstone seat 62.

[0020] Several sets of honing stone seats 62 are arranged and installed in the radial groove of the grinding head body 64, supported by the top cone 63. A honing stone 61 is fixedly embedded in the outer top of the honing stone seat 62. The grinding head body 64 has a cylindrical structure and is coaxially fixed to the honing rod 3 via an end connecting sleeve 65. The top cone 63 is coaxially and slidably assembled in the inner cavity of the grinding head body 64. The bottom of the honing stone seat 62 abuts against the outer conical surface of the top cone 63, and the honing stone seats 62 are arranged and installed in the radial groove of the grinding head body 64, supported by the top cone. Under the action of axial driving force, the axial movement generated by the top cone 63 is converted into the radial expansion movement of the honing stone seat 62, forcing the honing stone 61 to press against the inner wall of the workpiece with a predetermined pressure to establish effective contact. The grinding head body 64 performs a helical compound motion of circumferential rotation and axial reciprocating motion with the honing rod 3, continuously removing material from the inner wall of the workpiece through the abrasive grains, thereby realizing honing.

[0021] In a further optimized design, a connecting sleeve 65 is installed at the end of the grinding head body 64, and the connecting sleeve 65 is detachably connected to the end of the honing rod 3.

[0022] Further optimized, the ball screw type linear module 8 includes: a base 816, which is fixed to the top of the machine tool base 7, and a front end plate 814 and a rear end plate 82 are symmetrically mounted on the top surface of the base 816; a partition plate 86 is also provided between the front end plate 814 and the rear end plate 82 to enhance structural rigidity; two sets of linear guide rails 811 are provided, and the two sets of linear guide rails 811 are symmetrically fixed to the top of the base 816; a slide table 813, on the bottom of the slide table 813, several sliders 812 are symmetrically mounted, the sliders 812 are in close fit with the linear guide rails 811 below, and ball nuts 89 are provided in the geometric middle area of ​​the two sets of sliders 812, and the ball nuts 89 are fixed to the bottom of the slide table 813 by flanges 88; and a drive. The assembly includes a servo motor 81 fixed to the outside of the rear end plate 82, a ball screw 87 rotatably mounted between the front end plate 814 and the rear end plate 82, and a ball nut 89 fixed to the bottom of the slide table 813. The output shaft of the servo motor 81 is driven to one end of the ball screw 87 via a coupling 83, and the ball screw 87 and the ball nut 89 mesh to form a precision transmission pair. The servo motor 81 is fixed to the outside of the rear end plate 82, and its output shaft is connected to one end of the ball screw 87 via a coupling 83. The two ends of the ball screw 87 are supported by a front bearing 817 and a rear bearing 85 respectively installed in a front bearing housing 815 and a rear bearing housing 84. When the servo motor 81 drives the ball screw 87 to rotate, the ball nut 89 converts the rotational motion into the linear motion of the slide table, realizing the precise displacement of the slide table.

[0023] Further optimizing the scheme, the honing dresser 9 includes: a split bearing housing 94, which is fixedly installed on the upper plane of the slide table 813. The split bearing housing 94 has a highly coaxial sleeve assembly hole machined inside, and a circumferential anti-rotation key block is provided on the inner cylindrical surface of the sleeve assembly hole. Two threaded holes are symmetrically machined on the top surface of the split bearing housing 94 near the side edge; a dresser body, which includes a sleeve 93, a consolidation layer 92, and an abrasive layer 91. A positioning keyway that achieves a clearance-free fit with the circumferential anti-rotation key block of the split bearing housing 94 is precisely machined along the axial direction on the outer cylindrical surface of the sleeve 93. The sleeve 93 is interference-fitted into the split bearing housing 94; the abrasive layer 91 is manufactured by electroplating or brazing. The inner surface of the cylinder 93 is firmly bonded to the outer surface of the abrasive layer 91 through the consolidation layer 92; the bolt 95 is screwed into the threaded hole of the split bearing seat 94, and by applying the assembly torque, the elastic deformation of the split bearing seat 94 generates a radial clamping force pointing towards the axis to fasten the dresser body; the inner wall of the sleeve 93 of the dresser body fixes the abrasive layer 91 through the consolidation layer 92. Under the predetermined feed pressure, the honing stone establishes effective contact with the inner wall of the honing dresser, driving the multi-honing stone honing head 6 to perform a spiral compound motion of axial reciprocating and circumferential rotation in the honing dresser 9, realizing the reverse dressing of the multi-honing stone honing head 6 by the honing dresser 9, so that the outer circle profile formed by the honing stone combination approaches the high-precision geometry of the dressing reference surface.

[0024] In a further optimized design, the displacement measurement unit includes a grating ruler 810, which is mounted on the slide table 813.

[0025] The grating ruler 810 consists of a scale grating and a reading head. The scale grating is fixed to the machine tool base 7, and the reading head is mounted on the slide table 813 and moves synchronously with the slide table 813. During operation, a relative displacement is generated between the scale grating and the reading head. The displacement is converted into an electrical signal through the photoelectric effect and transmitted to the control system to realize the real-time measurement and feedback of the displacement of the slide table 813, providing data support for the precise control of the spatial position of the honing dresser 9.

[0026] Referring to Figure 7, a method for precision honing and in-situ dressing of cylindrical parts includes the following steps: S1, using a high-precision displacement control system to drive a ball screw-type linear module 8, and using a displacement measurement unit to detect the displacement of the ball screw-type linear module 8 in real time, thereby precisely adjusting the spatial position of the honing dresser 9 until the coaxiality error between the honing dresser 9 and the rotation axis of the multi-oil stone honing head 6 on the transmission system reaches the design allowable range, achieving precise automated alignment; S2, inserting the multi-oil stone honing head 6 axially into the inner hole of the honing dresser 9, and controlling the radial uniform expansion of the multi-oil stone honing head 6 according to the parameters and target accuracy of the multi-oil stone honing head 6, until... The working surface of the honing stone 61 is in close contact with the inner wall of the honing dresser 9, maintaining stable radial pressure; S3, according to the preset dressing process parameters, the multi-honing stone honing head 6 is driven to perform a spiral compound motion of axial reciprocating and circumferential rotation in the hole of the honing dresser 9, so that the outer circle contour formed by the honing stone combination approaches the high-precision geometry of the dressing reference surface, in order to reconstruct its high-precision cylindricity reference and maintain the high cutting performance of the honing stone; S4, after the dressing cycle is completed, the workpiece is trial-machined, the cylindricity of the workpiece is checked, the parameters are iteratively adjusted according to the test results, and steps S2-S3 are repeated until the cylindricity of the honing head meets the standard; S5, after confirming that the cylindricity of the honing head meets the accuracy requirements, the dressing process is completed.

[0027] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0028] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A device for in-situ finishing of precision honing of cylindrical parts, characterized in that, include: Machine base (7), serving as the overall support foundation and installation reference for the device; positioning fixture, which is installed on the top side of the machine base (7) for positioning and clamping cylindrical parts (10); transmission system, which is installed on the top of the machine base (7) and arranged correspondingly to the cylindrical parts (10); honing rod support frame (5), which is fixedly installed on the machine base (7) and located between the transmission system and the positioning fixture; multi-oil honing head (6), which is detachably connected to the output end of the transmission system; ball screw linear module (8), which is installed on the machine base (7) 7) is located on the intermediate reference surface between the positioning fixture and the honing rod support frame (5), and is adjacent to the positioning fixture in spatial layout; the ball screw type linear module (8) is arranged vertically relative to the machine tool base (7) and connected to the high-precision displacement control system; the honing dresser (9) is installed on the ball screw type linear module (8) and is arranged correspondingly to the multi-oil stone honing head (6); wherein, the ball screw type linear module (8) is equipped with a displacement measuring unit, which is used to measure the spatial position of the honing dresser (9) to ensure that the rotation axis of the honing dresser (9) and the multi-oil stone honing head (6) installed on the transmission system are coaxially aligned.

2. The in-situ finishing device for precision honing of cylindrical parts according to claim 1, characterized in that, The positioning fixture includes: a part base (14), which is fixed to the top of the machine tool base (7); several sets of V-shaped positioning blocks (13), which are arranged at equal intervals along the length of the part base (14), and the cylindrical part (10) is placed in the positioning groove of the V-shaped positioning block (13); several sets of clamping components, which are arranged corresponding to the V-shaped positioning blocks (13), and the clamping components include a chain (11) and a chain fixing pin (12). The chain (11) spans the outer periphery of the cylindrical part (10) to form a limiting fit, and the two ends of the chain (11) are respectively locked to the V-shaped positioning block (13) by the chain fixing pin (12).

3. The in-situ finishing device for precision honing of cylindrical parts according to claim 1, characterized in that, The transmission system includes: a reciprocating feed drive servo motor (2), which is horizontally mounted on the top surface of the machine tool base (7); a rotary drive servo motor (1), which is mounted next to the reciprocating feed drive servo motor (2); and a honing rod (3), one end of which is connected to the output shaft of the rotary drive servo motor (1), and the other end is detachably connected to the multi-oil stone honing head (6) through a honing head connecting rod (4).

4. The in-situ finishing device for precision honing of cylindrical parts according to claim 3, characterized in that, The multi-oilstone honing head (6) includes: a grinding head body (64), which has a cylindrical structure and a plurality of radial grooves are uniformly provided on the outer wall of the grinding head body (64) along the circumference; a top cone (63), which is coaxially and slidably assembled in the inner cavity of the grinding head body (64), which has a frustum structure, and the bottom of the oilstone seat (62) abuts against the outer cone surface of the top cone (63) to convert the axial movement of the top cone (63) into the radial expansion movement of the oilstone seat (62); a plurality of oilstone seats (62), which are supported by the top cone (63) and arranged in the radial grooves of the grinding head body (64); and an oilstone (61), which is fixedly embedded in the outer top of the oilstone seat (62).

5. The in-situ finishing device for precision honing of cylindrical parts according to claim 4, characterized in that, The end of the grinding head body (64) is equipped with a connecting sleeve (65), and the connecting sleeve (65) is detachably connected to the end of the honing rod (3).

6. The in-situ finishing device for precision honing of cylindrical parts according to claim 1, characterized in that, The ball screw type linear module (8) includes: a base (816), which is fixed to the top of the machine tool base (7), and a front end plate (814) and a rear end plate (82) are symmetrically installed on the top surface of the base (816); two sets of linear guides (811), which are symmetrically fixed to the top of the base (816); and a slide (813), which has several sliders (812) symmetrically installed at the bottom of the slide (813), which are in close fit with the linear guides (811) below without clearance. A ball nut (89) is provided in the geometric middle area of ​​the slider (812), and the ball nut (89) is fixed to the bottom of the slide table (813) by a flange (88); the drive assembly includes a servo motor (81) fixed to the outside of the rear end plate (82), a ball screw (87) rotatably connected between the front end plate (814) and the rear end plate (82), and a ball nut (89) fixed to the bottom of the slide table (813); the output shaft of the servo motor (81) is driven to one end of the ball screw (87) through a coupling (83), and the ball screw (87) and the ball nut (89) mesh to form a precision transmission pair.

7. The in-situ finishing device for precision honing of cylindrical parts according to claim 6, characterized in that, The honing dresser (9) includes: a split bearing housing (94), which is fixedly installed on the upper plane of the slide table (813). The split bearing housing (94) has a sleeve assembly hole with high coaxiality inside, and a circumferential anti-rotation key block is provided on the inner cylindrical surface of the sleeve assembly hole. Two threaded holes are symmetrically machined on the top surface of the split bearing housing (94) near the side edge. The dresser body includes a sleeve (93), a consolidation layer (92), and an abrasive layer (91). The outer cylindrical surface of the sleeve (93) is precisely machined along the axial direction with the split bearing housing (94). The circumferential anti-rotation key block of the split bearing housing (94) achieves a clearance-free positioning keyway, and the sleeve (93) is interference-fitted into the split bearing housing (94); the abrasive layer (91) is manufactured by electroplating or brazing; the inner surface of the sleeve (93) and the outer surface of the abrasive layer (91) are firmly bonded by the bonding layer (92); the bolt (95) is screwed into the threaded hole of the split bearing housing (94), and by applying the assembly torque, the elastic deformation of the split bearing housing (94) generates a radial clamping force pointing towards the axis to fasten the dressing body.

8. The in-situ finishing device for precision honing of cylindrical parts according to claim 6, characterized in that, The displacement measuring unit includes a grating ruler (810), which is mounted on the slide table (813).

9. A method for in-situ finishing of precision honing of cylindrical parts, based on the in-situ finishing apparatus for precision honing of cylindrical parts according to any one of claims 1-8, characterized in that, The process includes the following steps: S1. Using a high-precision displacement control system to drive the ball screw linear module (8), the displacement of the ball screw linear module (8) is detected in real time by a displacement measurement unit, thereby precisely adjusting the spatial position of the honing dresser (9) until the coaxiality error between the honing dresser (9) and the rotation axis of the multi-oil stone honing head (6) on the transmission system reaches the design allowable range, thus achieving precise automated alignment; S2. Inserting the multi-oil stone honing head (6) axially into the inner hole of the honing dresser (9), and controlling the multi-oil stone honing head (6) to expand radially and uniformly according to the parameters and target accuracy of the multi-oil stone honing head (6) until the oilstone (61) The working surface of the honing dresser (9) is in close contact with the inner wall of the honing dresser (9) and maintains a stable radial pressure; S3, according to the preset dressing process parameters, the multi-oilstone honing head (6) is driven to make a spiral compound motion of axial reciprocating and circumferential rotation in the hole of the honing dresser (9), so that the outer circle contour formed by the combination of oilstones approaches the high-precision geometric shape of the dressing reference surface, so as to reconstruct its high-precision cylindricity reference and maintain the high cutting performance of the oilstone; S4, after the dressing cycle is completed, the workpiece is trial-processed, the cylindricity of the workpiece is detected, the parameters are iteratively adjusted according to the detection results and the steps S2-S3 are repeated until the cylindricity of the honing head meets the standard; S5, after confirming that the cylindricity of the honing head meets the accuracy requirements, the dressing process is completed.

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