A process fixture for honing

Abstract

The application provides a honing process clamp applied to a cylinder sleeve, which comprises a positioning disc, a stud and a cover plate, the stud comprises a first end and a second end, the positioning disc comprises a disc body first end face, the first end of the stud is connected with the disc body first end face of the positioning disc, the second end of the stud is connected with the cover plate, so that a cylinder sleeve mounting position is formed between the positioning disc and the cover plate, and the cylinder sleeve is arranged in the cylinder sleeve mounting position. The movement of the cylinder sleeve in the X-axis direction and the rotation of the cylinder sleeve around the X-axis, the movement of the cylinder sleeve in the Z-axis direction and the rotation of the cylinder sleeve around the Z-axis are limited by the positioning disc, and then the movement of the cylinder sleeve in the Y-axis direction and the rotation of the cylinder sleeve around the Y-axis are limited by the clamping of the positioning disc and the cover plate, so that the wear problem caused by the movement and rotation of the cylinder sleeve due to the incomplete freedom limitation in the traditional clamping is effectively solved, the deviation and rework in the machining process are reduced, and the machining stability is improved.

Description

Technical Field

[0001] This application belongs to the technical field of cylinder liner honing auxiliary fixtures, specifically relating to a honing process fixture. Background Technology

[0002] As a core component of the cylinder assembly in a reciprocating compressor, the cylinder liner falls into the category of thin-walled parts, characterized by its light weight and simple structure. However, due to its special working environment and performance requirements, the machining accuracy and surface roughness of the cylinder liner's inner diameter must meet high standards. Therefore, the inner diameter needs to be precisely machined through honing.

[0003] Currently, in cylinder liner honing, a scientific and complete tooling and fixture system has not yet been established to simplify the clamping process, and in practice, traditional tools are often relied upon for clamping. Because cylinder liners are generally made of JT25-47D material and have a thin-walled structure, their rigidity is poor, making them prone to deformation and wear due to uneven stress during traditional clamping. Furthermore, traditional clamping methods do not adequately restrict the cylinder liner's degrees of freedom, leading to movement and rotation during machining, further exacerbating wear and ultimately resulting in low production efficiency. Utility Model Content

[0004] Therefore, the purpose of this application is to provide a honing process fixture, which at least solves one of the technical problems mentioned in the background art.

[0005] To address the aforementioned problems, this application provides a honing process fixture for cylinder liners, comprising a positioning disc, a stud, and a cover plate. The stud includes a first end and a second end, and the positioning disc includes a first end face of the disc body. The first end of the stud is connected to the first end face of the positioning disc. The second end of the stud is connected to the cover plate, thereby forming a cylinder liner mounting position between the positioning disc and the cover plate, and the cylinder liner is disposed within the cylinder liner mounting position.

[0006] Optionally, the positioning disk has a first inner stop on the first end face of the disk body; the cover plate includes a first end face of the plate body, and a second inner stop is formed on the first end face of the plate body; a cylinder liner mounting position is formed between the first inner stop and the second inner stop, and the cylinder liner is disposed in the cylinder liner mounting position so that one end of the cylinder liner abuts against the first inner stop and the other end abuts against the second inner stop.

[0007] Optionally, a threaded hole is provided on the first end face of the positioning disk, and the first end of the stud is screwed into the threaded hole.

[0008] Optionally, the number of studs is the same as the number of threaded holes, and is at least four.

[0009] Optionally, the cover plate has a connecting through hole corresponding to the threaded hole on the positioning plate, and the second end of the stud passes through the connecting through hole and is positioned by a nut.

[0010] Optionally, the positioning disk further includes a second end face of the disk body, which is cut off along the edge of the first end face of the positioning disk body toward the second end face of the disk body, so that the first end face of the disk body forms a stepped surface.

[0011] Optionally, a stepped hole is provided on the second end face of the disc body, and the stepped hole communicates with the first inner stop.

[0012] Optionally, the cover plate includes a second end face of a plate body, and the second end face of the plate body has a through hole, which communicates with the second inner stop.

[0013] Optionally, the first end and the second end of the stud are at least partially provided with external threads, and the external threads at the first end and the external threads at the second end have the same or different directions of rotation.

[0014] Optionally, the portion of the stud without external threads is a smooth rod, and the smooth rod has a clamping plane on its outer peripheral surface near the first end, with the two clamping planes located on opposite sides of the outer peripheral surface of the smooth rod.

[0015] By employing the above technical solution, this utility model application has at least the following beneficial effects: This application provides a honing process fixture, in which one end of the cylinder liner is installed at the first inner stop of the positioning plate, and then the cover plate is installed on the second end of the stud, and the other end of the cylinder liner is installed on the second inner stop of the cover plate. A nut is screwed onto the second end of the stud, fixing the cylinder liner between the positioning plate and the cover plate. This completely restricts the cylinder liner's degree of freedom, preventing wear caused by movement or rotation during machining, reducing machining difficulty, and improving production efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly of a honing process fixture and a cylinder set according to an embodiment of this application; Figure 2 This is a cross-sectional view of the cover plate according to an embodiment of this application; Figure 3 This is a front view of the cover plate according to an embodiment of this application; Figure 4 This is a cross-sectional view of the positioning disk according to an embodiment of this application; Figure 5 This is a front view of the positioning disk according to an embodiment of this application; Figure 6 This is a front view of the stud according to an embodiment of this application; Figure 7 This is a cross-sectional view of the stud AA in an embodiment of this application.

[0017] The reference numerals in the attached figures are as follows: 1. Nut 2. Cover plate; 201. Second inner stop; 202. Connecting through hole; 3. Stud; 301. Clamping plane; 4. Positioning plate; 401. First inner stop; 402. Threaded hole. Detailed Implementation

[0018] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0020] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] See also Figures 1 to 7As shown in the embodiment of this application, a honing process fixture is provided for cylinder liners, including a positioning plate 4, a stud 3, and a cover plate 2. The stud 3 includes a first end and a second end, and the positioning plate 4 includes a first end face of the plate body. The first end of the stud 3 is connected to the first end face of the plate body of the positioning plate 4. The second end of the stud 3 is connected to the cover plate 2 so that a cylinder liner mounting position is formed between the positioning plate 4 and the cover plate 2, and the cylinder liner is disposed in the cylinder liner mounting position.

[0023] The first end of the stud 3 is connected to the first end face of the positioning disk 4; the first end of the stud 3 and the first end face of the positioning disk 4 are connected by threads; the two are fixedly connected by thread engagement, and the connection strength can be ensured by tightening, and they can also be quickly disassembled to facilitate tooling maintenance or replacement of parts.

[0024] The second end of the stud 3 is connected to the cover plate 2; the second end of the stud 3 passes through the cover plate 2 and is screwed with a nut 1. By adjusting the screwing depth of the nut 1, the distance between the cover plate 2 and the positioning plate 4 can be flexibly controlled. This ensures that the cylinder liner is stably clamped in the cylinder liner mounting position between the cover plate 2 and the positioning plate 4, and also avoids deformation of the thin-walled cylinder liner due to excessive clamping force, which meets the goal of reducing wear and protecting the cylinder liner.

[0025] The cylinder liner includes a shoulder end and a small end. The shoulder end of the cylinder liner cooperates with the positioning plate 4, realizing the restriction of four degrees of freedom: movement and rotation around the X-axis, movement and rotation around the Z-axis. The small end of the cylinder liner cooperates with the cover plate 2, and then the cylinder liner is clamped by the stud 3 and the nut 1 to fix it, restricting the two degrees of freedom: movement and rotation around the Y-axis, and finally realizing the complete positioning of the cylinder liner.

[0026] In another embodiment, a first inner stop 401 is provided on the first end face of the positioning disk 4; the cover plate 2 includes a first end face of the plate body, and a second inner stop 201 is provided on the first end face of the plate body; a cylinder liner mounting position is formed between the first inner stop 401 and the second inner stop 201, and the cylinder liner is disposed in the cylinder liner mounting position so that one end of the cylinder liner abuts against the first inner stop 401 and the other end abuts against the second inner stop 201.

[0027] The positioning disk 4 has a first inner stop 401 on the first end face of the disk body. That is to say, the positioning disk 4 has a disk-shaped structure. The first inner stop 401 is machined into the first end face of the disk body of the positioning disk 4 and is coaxially arranged with the positioning disk 4. Under normal circumstances, the inner diameter of the first inner stop 401 is adapted to the outer diameter of the cylinder liner shoulder end, ensuring that the cylinder liner can be installed smoothly while limiting radial displacement. The depth of the first inner stop 401 matches the axial length of the cylinder liner shoulder end, so that the cylinder liner shoulder end is precisely fitted with the step surface of the first inner stop 401 after being inserted, and undertakes the axial positioning and support of the cylinder liner.

[0028] Among them, the cover plate 2 is a plate-shaped functional component. The first end face of the cover plate 2 is the end face that is directly opposite to the first end face of the positioning disk 4. A second inner stop 201 that is concave is machined on the first end face of the plate. The inner diameter of the second inner stop 201 is adapted to the outer diameter of the small end of the cylinder liner. Together with the first inner stop 401, it constrains the radial degree of freedom of the cylinder liner and avoids the cylinder liner from becoming eccentric or shaking during the machining process.

[0029] After the positioning plate 4 and the cover plate 2 are assembled by the studs 3, the first inner stop 401 and the second inner stop 201 are arranged opposite each other along the axial direction, and the space enclosed between them is the cylinder liner mounting position.

[0030] The annular sidewalls of the first inner stop 401 and the second inner stop 201 wrap around and limit the cylinder liner from the outer periphery, restricting the displacement and rotation of the cylinder liner in the direction perpendicular to the axial direction (such as the X and Y axes), ensuring the coaxiality of the cylinder liner axis with the processing equipment (such as the honing machine spindle), and providing a foundation for high-precision machining; the shoulder end of the cylinder liner abuts against the stepped surface of the first inner stop 401, and the small end abuts against the stepped surface of the second inner stop 201, realizing bidirectional positioning in the axial direction (such as the Z axis direction), avoiding the cylinder liner from moving due to axial force (such as the feed pressure of the honing head) during machining, and ensuring the stability of the machining dimensions.

[0031] The specific implementation process is as follows: During actual assembly, first align the cylinder liner shoulder end with the first inner stop 401, and quickly insert it using the guide of the stop, so that the end face of the cylinder liner shoulder end fits against the stepped surface of the first inner stop 401; then put the cover plate 2 on the stud 3, so that the second inner stop 201 of the cover plate 2 aligns with the small end of the cylinder liner, and tighten the nut 1 at the second end of the stud 3 to lock the cover plate 2 and the positioning plate 4, and press the stepped surface of the second inner stop 201 against the other end of the cylinder liner, completing the radial and axial full constraint positioning of the cylinder liner, providing a stable clamping state for subsequent processing.

[0032] In another embodiment, a threaded hole 402 is provided on the first end face of the positioning disk 4, and the first end of the stud 3 is screwed into the threaded hole 402.

[0033] Among them, the threaded holes 402 are arranged at equal intervals along the circumference of the first end face of the positioning disk 4; the depth of the threaded holes 402 is greater than the screw length of the first end of the stud 3, which satisfies the connection strength and prevents the stud 3 from being screwed in too deeply and affecting the overall strength of the positioning disk 4.

[0034] When installing the studs 3 on the positioning plate 4, the preload torque is set by using a torque wrench to ensure that the preload of multiple studs 3 is consistent.

[0035] The diameter of the circle formed by connecting the centers of multiple threaded holes 402 is larger than the inner diameter of the first inner stop 401. In other words, the diameter of the outer circle formed after the stud 3 is screwed onto the threaded hole 402 is larger than the inner diameter of the first inner stop 401, thus avoiding interference between the cylinder liner and the stud 3 during installation.

[0036] In another embodiment, the number of studs 3 is the same as the number of threaded holes 402, and is at least four.

[0037] The number of studs 3 is at least four. When the cover plate 2 is connected to the positioning plate 4 via the studs 3 and a clamping force is applied to the cylinder liner installed between them, the multiple studs 3 can evenly distribute the clamping force between the positioning plate 4 and the cover plate 2, avoiding the defect of excessive local stress. At the same time, the combined effect of multiple studs 3 can significantly enhance the connection strength between the positioning plate 4 and the cover plate 2, making the overall structure more robust.

[0038] In another embodiment, the cover plate 2 has a connecting through hole 202 corresponding to the threaded hole 402 on the positioning plate 4, and the second end of the stud 3 passes through the connecting through hole 202 and is positioned by the nut 1.

[0039] The cover plate 2 has a connecting through hole 202 that corresponds to the threaded hole 402 on the positioning plate 4. That is, the connecting through hole 202 and the threaded hole 402 correspond one-to-one and are the same in number. They are arranged at equal intervals along the circumference of the cover plate 2. Here, the connecting through hole 202 and the threaded hole 402 are strictly coaxial, so that the cover plate 2 can be smoothly fitted onto multiple studs 3 and avoid eccentric stress during assembly.

[0040] Specifically, the diameter of the connecting through hole 202 is larger than the outer diameter of the second end of the stud 3, forming a clearance fit. This ensures that the stud 3 can easily pass through the connecting through hole 202, reducing assembly resistance, and also provides space for fine-tuning the position of the cover plate 2. This facilitates compensation for the machining errors of the positioning plate 4 and the cover plate 2, ensuring the parallelism between the cover plate 2 and the positioning plate 4.

[0041] The second end of the stud 3 passes through the connecting through hole 202 and is positioned by the nut 1. When the first end of the stud 3 is screwed into the threaded hole 402 of the positioning plate 4, the exposed length of the second end after passing through the connecting through hole 202 of the cover plate 2 must meet the screwing requirements of the nut 1 to ensure that the nut 1 can be fully locked and has an adjustment margin.

[0042] After the nut 1 is screwed into the second end of the stud 3, tightening the nut 1 will press the cover plate 2 towards the positioning plate 4, making the second inner stop 201 of the cover plate 2 in close contact with the small end of the cylinder liner, thus achieving axial clamping of the cylinder liner. The tightening torque of the nut 1 needs to be controlled evenly to ensure that the clamping force of multiple nuts 1 is consistent, avoiding deformation of the thin-walled cylinder liner due to excessive local force.

[0043] In another embodiment, the positioning disk 4 further includes a second end face of the disk body, which is cut off along the edge of the first end face of the disk body toward the second end face of the disk body, so that the first end face of the disk body forms a stepped surface.

[0044] Specifically, the edge of the first end face of the positioning disc 4 is cut towards the second end face of the disc body to form a stepped surface on the first end face of the disc body. This ensures the connection strength of the first end face of the disc body and the installation and positioning of the shoulder end of the cylinder liner, while also ensuring the lightweight of the positioning disc 4.

[0045] In another embodiment, a stepped hole is provided on the second end face of the disc body, and the stepped hole communicates with the first inner stop 401.

[0046] The stepped hole includes a first hole and a second hole. The first hole is located near the second end face of the disc body, and the second hole communicates with the first inner stop 401. The inner diameter of the first hole is larger than the inner diameter of the second hole, forming a stepped hole. The inner diameter of the second hole is smaller than the inner diameter of the first inner stop 401, so that the bottom of the first inner stop 401 forms a stepped surface, which is used to position the shoulder end of the cylinder liner. The stepped hole can both facilitate the discharge of oil injected during honing and reduce the weight of the positioning disc 4, which is beneficial for handling and disassembly.

[0047] In another embodiment, the cover plate 2 includes a second end face of the plate body, and a through hole is formed on the second end face of the plate body, which communicates with the second inner stop 201.

[0048] The diameter of the through hole is smaller than the diameter of the second inner stop 201, so that the bottom of the second inner stop 201 forms a stepped surface for positioning the small end of the cylinder liner. The honing machine spindle can pass through the through hole and the second inner stop 201 of the cover plate 2 and perform cyclic feeding motion in the vertical direction, thereby honing the inner diameter of the cylinder liner.

[0049] In another embodiment, the first end and the second end of the stud 3 are at least partially provided with external threads, and the external threads at the first end and the external threads at the second end have the same or different directions of rotation.

[0050] If the first and second ends of the stud 3 have the same thread direction, during assembly, first screw the first end of the stud 3 into the threaded hole 402 of the positioning plate 4 and tighten it, then fit the connecting through hole 202 of the cover plate 2 into the second end of the stud 3, and finally tighten it with the nut 1. This method is compatible with standard threaded parts, eliminating the need for custom-made special threads and reducing processing costs. Assembly personnel can use conventional tools (such as wrenches) to complete assembly and disassembly according to the same thread direction logic, reducing operational errors.

[0051] If the external threads at the first and second ends of the stud 3 are rotated in opposite directions, and a design with different rotation directions is adopted, such as the first end being right-handed and the second end being left-handed, when the honing machine vibrates during operation, if the threads at both ends of the stud 3 are rotated in opposite directions, the locking force of the nut 1 and the threaded hole 402 of the positioning plate 4 on the stud 3 will form a mutual balance, reducing the risk of the stud 3 loosening as a whole.

[0052] In another embodiment, the unthreaded portion of the stud 3 is a smooth rod, and a clamping plane 301 is provided on the outer peripheral surface of the smooth rod near the first end. The two clamping planes 301 are located on opposite sides of the outer peripheral surface of the smooth rod. When assembling the stud 3, the two opposing clamping planes 301 are clamped by a wrench, which can stably apply torque and ensure that the first end of the stud 3 is firmly screwed into the threaded hole 402 of the positioning plate 4. This avoids loosening of the connection due to hand tightening or tool slippage, and ensures the connection strength between the stud 3 and the positioning plate 4. Compared with a circular smooth rod, the planar structure can prevent the tool from slipping when force is applied, thus improving assembly efficiency.

[0053] The honing fixture utilizes the large area and resistance to deformation of the cylinder liner shoulder end under stress, positioning it downwards. The clamping method between the positioning plate 4 and the cover plate 2 prevents cylinder liner deformation caused by improper mounting, ensuring the structural integrity of the cylinder liner. This positioning and clamping scheme, while restricting the cylinder liner's degrees of freedom, avoids excessive compression or friction, reducing wear during mounting and machining, and ensuring machining accuracy and surface quality. The positioning plate 4 restricts the cylinder liner's movement and rotation around the X-axis, and its movement and rotation around the Z-axis. Furthermore, the clamping between the positioning plate 4 and the cover plate 2 restricts movement and rotation around the Y-axis. This effectively solves the problem of cylinder liner movement and rotation caused by incomplete degree-of-freedom restriction in traditional mounting, reducing deviations and rework during machining and improving machining stability.

[0054] The tooling fixture consists of a nut 1, a cover plate 2, a stud 3, and a positioning plate 4. Its simple structure and convenient installation and clamping operation reduce the labor intensity of workers and shorten installation time, thereby improving overall production efficiency. The inner hole design of the positioning plate 4 not only allows for the drainage of oil injected during honing but also reduces the weight of the tooling itself, making it easier to handle and disassemble, thus improving operational convenience. The cover plate 2 is designed to allow the honing machine spindle to pass through and perform vertical circulating feed, perfectly matching the working method of the honing machine and ensuring smooth processing.

[0055] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0056] The above are merely preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application. The above are merely preferred embodiments of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this application, and these improvements and modifications should also be considered within the protection scope of this application.

Claims

1. A honing fixture, characterized in that, The cylinder liner is applied to a positioning plate (4), a stud (3), and a cover plate (2). The stud (3) has a first end and a second end. The positioning plate (4) has a first end face of the plate body. The first end of the stud (3) is connected to the first end face of the plate body of the positioning plate (4). The second end of the stud (3) is connected to the cover plate (2) so that a cylinder liner mounting position is formed between the positioning plate (4) and the cover plate (2). The cylinder liner is set in the cylinder liner mounting position.

2. The honing fixture according to claim 1, characterized in that, The positioning disc (4) has a first inner stop (401) on the first end face of the disc body; the cover plate (2) includes a first end face of the plate body, and a second inner stop (201) is provided on the first end face of the plate body; a cylinder liner mounting position is formed between the first inner stop (401) and the second inner stop (201), and the cylinder liner is disposed in the cylinder liner mounting position so that one end of the cylinder liner abuts against the first inner stop (401) and the other end abuts against the second inner stop (201).

3. The honing fixture according to claim 1, characterized in that, The positioning disk (4) has a threaded hole (402) on the first end face of the disk body, and the first end of the stud (3) is screwed into the threaded hole (402).

4. A honing fixture according to claim 3, characterized in that, The number of studs (3) is the same as the number of threaded holes (402), and is at least 4.

5. A honing fixture according to claim 3, characterized in that, The cover plate (2) has a connecting through hole (202) corresponding to the threaded hole (402) on the positioning plate (4). The second end of the stud (3) passes through the connecting through hole (202) and is positioned by the nut (1).

6. A honing fixture according to claim 2, characterized in that, The positioning disk (4) also includes a second end face of the disk body, which is cut off along the edge of the first end face of the disk body toward the second end face of the disk body, so that the first end face of the disk body forms a stepped surface.

7. A honing fixture according to claim 6, characterized in that, The second end face of the disc body is provided with a stepped hole, which is connected to the first inner stop (401).

8. A honing fixture according to claim 6, characterized in that, The cover plate (2) includes a second end face of the plate body, and the second end face of the plate body has a through hole, which communicates with the second inner stop (201).

9. A honing fixture according to claim 1, characterized in that, The first end and the second end of the stud (3) are at least partially provided with external threads, and the external threads of the first end and the external threads of the second end have the same or different directions of rotation.

10. A honing fixture according to claim 9, characterized in that, The stud (3) without external threads is a smooth rod. The smooth rod has a clamping plane (301) on its outer peripheral surface near the first end. The two clamping planes (301) are located on opposite sides of the outer peripheral surface of the smooth rod.

Images