A honing clamping fixture for the inner hole of a cylindrical workpiece

Abstract

This utility model discloses a honing clamping fixture for the inner hole of a cylindrical workpiece, relating to the field of honing technology. It includes a pressure sleeve with an internal thread and an axial limiting structure; a tapered sleeve with a first tapered surface on its outer surface and a second reverse tapered surface on its inner surface matching the outer contour of the cylindrical workpiece; and a clamping sleeve with an external thread at its lower part that mates with the internal thread of the pressure sleeve, and a third tapered surface that mates with the first tapered surface. The advantages are: by feeding the cylindrical workpiece to be processed into the tapered sleeve through the bottom through hole, then placing the tapered sleeve into the pressure sleeve, and then coaxially feeding the clamping sleeve into the clamping sleeve, the clamping sleeve is driven to move axially by tightening the pressure sleeve. The third tapered surface compresses the first tapered surface of the tapered sleeve to achieve radial contraction, causing the second reverse tapered surface to grip the cylindrical workpiece, thus ensuring stable clamping of the cylindrical workpiece, preventing rotation between the workpiece and the fixture due to friction generated during honing, improving clamping efficiency, and ensuring operational safety.

Description

Technical Field

[0001] This utility model relates to the field of honing technology for parts, and in particular to a clamping fixture for honing the inner hole of a cylindrical workpiece. Background Technology

[0002] As a crucial component in servo valves, the machining accuracy of the radial bore that mates with the flow channel is critical to the valve's performance. The diameter and position tolerances of the radial bore in the valve sleeve are both within 5 micrometers. Therefore, the final process for machining the inner bore of the valve sleeve is expansion honing. This involves using an oilstone to expand and continuously rub against the inner bore of the part, thus achieving the purpose of grinding the inner bore. Currently, valve sleeve honing is mostly done manually or semi-automatically, requiring employees to hold the part by hand or use sandpaper or other auxiliary tools for clamping. However, the outer circumference of the valve sleeve is smooth, making the workpiece unstable when clamped. Because of the continuous friction between the oilstone and the inner bore during honing, and because the workpiece is cylindrical, relying solely on hand-held or sandpaper-assisted clamping is insufficient.

[0003] Therefore, traditional manual clamping has two main problems: workpiece injury to the hand. When the workpiece is detached from the hand, the employee's hand cannot be removed in time and is easily injured by the rotating workpiece, posing a safety hazard; and damage to the workpiece. When sandpaper is used to assist in clamping the workpiece detached from the hand, the presence of particles on the sandpaper will damage the outer surface of the workpiece. Summary of the Invention

[0004] The main purpose of this utility model is to propose a honing clamping fixture for the inner hole of a cylindrical workpiece, which aims to solve the problem of unstable hand-held or sandpaper-assisted clamping.

[0005] To achieve the above objectives, this utility model proposes a honing clamping fixture for the inner hole of a cylindrical workpiece, including a pressure sleeve, which is provided with an internal thread and an axial limiting structure. A tapered sleeve has a first tapered surface on its outer surface and a second reverse tapered surface on its inner surface that matches the outer contour of the cylindrical part. The compression sleeve has an external thread at its lower part that mates with the internal thread of the compression sleeve, and a third conical surface that mates with the first conical surface.

[0006] In one embodiment, the bottom end of the tapered sleeve is located at the lower end of the first tapered surface, and a through hole is formed at the bottom end, which matches the outer diameter of the cylindrical part.

[0007] In one embodiment, the pressure sleeve, the tapered sleeve, and the clamping sleeve are coaxially assembled, and the axial limiting structure of the pressure sleeve is an inner stepped shoulder, which is used to constrain the axial displacement of the clamping sleeve.

[0008] In one embodiment, the tapered sleeve is provided with an annular deformation groove in the transition area between the first tapered surface on its outer surface and the bottom end face.

[0009] In one embodiment, the outer upper part of the compression sleeve and / or the outer side of the compression sleeve is a racetrack-shaped structure, the annular part of the racetrack-shaped structure is provided with a first anti-slip texture, and the horizontal part of the racetrack-shaped structure is provided with a second anti-slip texture.

[0010] In one embodiment, the second anti-slip texture consists of several longitudinal lines to prevent left and right sliding.

[0011] In one embodiment, the first anti-slip pattern is at least one of cross pattern, straight stripe, and willow leaf pattern.

[0012] In one embodiment, the included angle between the first conical surface and the second reverse conical surface is 1-5°.

[0013] In one embodiment, both the first conical surface and the second reverse conical surface are made of copper alloy material.

[0014] The technical solution of this utility model involves feeding the cylindrical part to be processed into the tapered sleeve through the bottom through hole, then placing the tapered sleeve into the pressure sleeve, and then coaxially feeding the pressure sleeve into the pressure sleeve. By tightening the pressure sleeve, the pressure sleeve is driven to move axially. The third tapered surface presses against the first tapered surface of the tapered sleeve to achieve radial contraction, so that the second reverse tapered surface hugs the cylindrical part, ensuring the stable clamping of the cylindrical part to be processed, preventing the workpiece and the tooling from rotating due to the friction generated during honing, improving clamping efficiency, and ensuring operational safety. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 An exploded view of a front view of an embodiment of a honing clamping fixture for the inner hole of a cylindrical workpiece provided by this utility model; Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction; Figure 3 An exploded perspective view of one embodiment of a honing clamping fixture for the inner hole of a cylindrical workpiece provided by this utility model; Figure 4 A schematic diagram of the assembled structure of an embodiment of a honing clamping fixture for the inner hole of a cylindrical workpiece provided by this utility model; Figure 5 for Figure 4 Schematic diagram of the cross-sectional structure along the BB direction; Figure 6This is a schematic diagram of the honing process in one embodiment of a honing clamping fixture for the inner hole of a cylindrical workpiece provided by this utility model.

[0017] Explanation of icon numbers: 1. Pressure sleeve; 2. Tapered sleeve; 21. Tapered block; 210. First tapered surface; 212. Second reverse tapered surface; 22. Annular deformation groove; 3. Pressing sleeve; 31. Third tapered surface; 4. Cylindrical part; 5. First anti-slip texture; 6. Second anti-slip texture; 7. Honing spindle; 8. Honing head.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0020] It should be noted that if any directional indication (such as up, down, left, right, front, back, etc.) is involved in the embodiments of this utility model, such directional indication is only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0021] Furthermore, if the embodiments of this utility model involve descriptions such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Furthermore, the use of "and / or" or "and / or" throughout the text includes three parallel options; for example, "A and / or B" includes option A, option B, or options where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0022] This application relates to a clamping fixture for honing the inner hole of a cylindrical workpiece. A honing fixture for the inner hole of a cylindrical workpiece, characterized in that it comprises: Pressure sleeve 1, which is provided with internal thread and axial limiting structure; The tapered sleeve 2 has a first tapered surface 210 on its outer surface and a second reverse tapered surface 212 on its inner surface that matches the outer contour of the cylindrical part 4. The compression sleeve 3 has an external thread at its lower part that mates with the internal thread of the compression sleeve 1, and a third conical surface 31 that mates with the first conical surface 210.

[0023] Among them, the pressure sleeve 1, the conical sleeve 2 and the clamping sleeve 3 are coaxially assembled. By tightening the pressure sleeve 1, the clamping sleeve 3 is driven to move axially. The third conical surface 31 is used to press the first conical surface 210 of the conical sleeve 2 to achieve radial contraction, so that the second reverse conical surface 212 hugs the cylindrical part 4.

[0024] In one embodiment, the bottom end of the tapered sleeve 2 is located at the lower end of the first tapered surface 210. A through hole is opened at the bottom end, which matches the outer diameter of the cylindrical part 4. The bottom end is a cylinder, and the outer diameter of the cylinder is consistent with the outer diameter of the bottom of the first tapered surface 210.

[0025] In one embodiment, the pressure sleeve 1, the tapered sleeve 2, and the clamping sleeve 3 are coaxially assembled. The axial limiting structure of the pressure sleeve 1 is an inner stepped shoulder, which is used to constrain the axial displacement of the clamping sleeve 3.

[0026] In one embodiment, an annular deformation groove 22 is provided in the transition area between the first conical surface 210 on the outer surface of the cone sleeve 2 and the bottom end face, which can effectively accommodate the material deformation of the cone block 21 on the cone sleeve 2.

[0027] In one embodiment, the outer side of the upper part of the clamping sleeve 3 or the outer side of the clamping sleeve 1 is a racetrack-shaped structure. The annular part of the racetrack-shaped structure is provided with a first anti-slip texture 5, and the horizontal part of the racetrack-shaped structure is provided with a second anti-slip texture 6.

[0028] In one embodiment, the second anti-slip texture 6 consists of several longitudinal grooves to prevent lateral slippage. During honing, the operator holds the fixture that has clamped the cylindrical workpiece and inserts it into the honing head 8. Then, the honing machine is started, and the honing spindle 7 begins to drive the honing head 8 to rotate. Then, the operator steps on the pedal to control the radial feed of the honing stone. During the honing process, the radial pressure of the honing stone will provide radial force to the cylindrical workpiece 4. Therefore, the operator needs to overcome the radial pressure of the honing stone to complete the honing of the cylindrical workpiece 4. Thus, longitudinal grooves are provided on the clamping fixture to provide greater resistance and prevent the workpiece from slipping out of the hand.

[0029] In one embodiment, the first anti-slip texture 5 is at least one of cross pattern, straight stripe, and willow leaf pattern, and the clamping resistance is increased by setting the first anti-slip texture 5.

[0030] In one embodiment, the included angle between the first conical surface 210 and the second reverse conical surface 212 is 1-5°. Specifically, the included angle between the first conical surface 210 and the horizontal plane is α, and the included angle between the second reverse conical surface 212 and the horizontal plane is β.

[0031] In one embodiment, both the first conical surface 210 and the second reverse conical surface 212 are made of copper alloy material.

[0032] Working principle: First, the cylindrical part 4 to be processed is fed into the tapered sleeve 2 through the bottom through hole. Then, the tapered sleeve 2 is placed into the pressure sleeve 1. Next, the pressure sleeve 3 is coaxially fed into the pressure sleeve 3. By tightening the pressure sleeve 1, the pressure sleeve 3 is driven to move axially. The third tapered surface 31 is used to press the first tapered surface 210 of the tapered sleeve 2 to achieve radial contraction, so that the second reverse tapered surface 212 hugs the cylindrical part 4.

[0033] After clamping, press down on the longitudinal grooves of the racetrack-shaped structure of the pressure sleeve 1 and the clamping sleeve 3 with both hands, and insert the cylindrical part 4 to be honed into the honing head 8. Then start the honing machine, and the honing spindle 7 will start to drive the honing head 8 to rotate. Then, use the foot pedal to control the radial feed of the honing stone. After honing is completed, release the pedal and remove the cylindrical part 4. Honing the other cylindrical part 4 can be done by following the steps above.

[0034] The following description, using a preferred embodiment, illustrates the content related to the above embodiments: Reference Figures 1-2 This embodiment provides a honing clamping fixture for the inner hole of a cylindrical workpiece, including a pressure sleeve 1, a tapered sleeve 2, and a clamping sleeve 3.

[0035] The part is placed into the conical sleeve 2, and then into the conical hole of the clamping sleeve 3. The clamping sleeve 1 and the clamping sleeve 3 reduce the distance between the clamping sleeve 1 and the clamping sleeve 3 through the thread. The conical surface of the clamping sleeve 3 and the conical surface of the conical sleeve 2 continuously approach each other. The conical surface of the conical sleeve 2 continuously shrinks towards the outer surface of the part until it is completely locked. The part clamping process is completed.

[0036] During this process, the tapered sleeve 2 is made of copper alloy, which is relatively soft and will not damage the outer surface of the workpiece during the shrinking and clamping process. The tapered sleeve 2 achieves a change in diameter by engaging with the tapered surface of the clamping sleeve 3 through a 2.3° taper on its outer surface. The tapered sleeve 2 also achieves the function of clamping the workpiece by tightly adhering to the outer surface of the workpiece through a 2° reverse taper on its inner surface. A 2mm wide groove is provided at the junction of the tapered and straight surfaces of the tapered sleeve 2 to effectively accommodate material deformation of the tapered surface of the tapered sleeve 2. The clamping sleeve 1 locks the tooling through the internal thread and the external thread of the clamping sleeve 3, and the knurled structure on the outer surfaces of both greatly increases the friction when the worker holds the tool. A limiting structure is provided on the left side of the clamping sleeve 1 to ensure that no axial displacement occurs during the clamping of the workpiece. The presence of the flat square structure allows for the use of mechanical tools to assist in locking, and during semi-automatic and automatic honing, the entire tooling can be pressed into the working plane of the equipment through this flat square, further preventing the workpiece and tooling from rotating due to the friction generated during honing, thus avoiding the risk of injury from rotating workpieces.

[0037] In addition, the overall structure of the tooling is not complicated, with only one threaded connection, making clamping efficient.

[0038] It should be understood that the terms "one embodiment" or "one example" throughout the specification mean that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, "in one embodiment" or "in one example" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Those skilled in the art should also recognize that the embodiments described in the specification are optional embodiments, and the actions and modules involved are not necessarily essential to the present invention.

[0039] In various embodiments of this utility model, it should be understood that the sequence number of each process does not necessarily imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of this utility model embodiment.

[0040] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, or they may sometimes be executed in reverse order, depending on the functions involved. It is particularly important to note that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0041] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A clamping fixture for honing the inner hole of a cylindrical workpiece, characterized in that, include: The pressure sleeve (1) is provided with an internal thread and an axial limiting structure; The conical sleeve (2) has a first conical surface (210) on its outer surface and a second reverse conical surface (212) on its inner surface that matches the outer contour of the cylindrical part (4). The compression sleeve (3) has an external thread at its lower part that mates with the internal thread of the compression sleeve (1), and a third conical surface (31) that mates with the first conical surface (210).

2. The honing clamping fixture for the inner hole of a cylindrical workpiece as described in claim 1, characterized in that: The bottom end of the tapered sleeve (2) is located at the lower end of the first tapered surface (210), and a through hole is opened at the bottom end. The through hole matches the outer diameter of the cylindrical part (4).

3. The honing clamping fixture for the inner hole of a cylindrical workpiece as described in claim 1, characterized in that: The pressure sleeve (1), the tapered sleeve (2), and the clamping sleeve (3) are coaxially assembled. The axial limiting structure of the pressure sleeve (1) is an inner stepped shoulder, which is used to constrain the axial displacement of the clamping sleeve (3).

4. The honing clamping fixture for the inner hole of a cylindrical workpiece as described in claim 1, characterized in that: The tapered sleeve (2) has an annular deformation groove (22) in the transition area between the first tapered surface (210) on its outer surface and the bottom end face.

5. The honing clamping fixture for the inner hole of a cylindrical workpiece as described in claim 1, characterized in that: The upper outer side of the compression sleeve (3) and / or the outer side of the compression sleeve (1) are racetrack-shaped structures. The annular part of the racetrack-shaped structure is provided with a first anti-slip texture (5), and the horizontal part of the racetrack-shaped structure is provided with a second anti-slip texture (6).

6. The honing clamping fixture for the inner hole of a cylindrical workpiece as described in claim 5, characterized in that: The second anti-slip texture (6) consists of several longitudinal lines, used to prevent left and right sliding.

7. The honing clamping fixture for the inner hole of a cylindrical workpiece as described in claim 5, characterized in that: The first anti-slip pattern (5) is at least one of cross pattern, straight stripe, and willow leaf pattern.

8. The honing clamping fixture for the inner hole of a cylindrical workpiece as described in claim 1, characterized in that: The included angle between the first conical surface (210) and the second reverse conical surface (212) is 1-5°.

9. The honing clamping fixture for the inner hole of a cylindrical workpiece as described in claim 1, characterized in that: Both the first conical surface (210) and the second reverse conical surface (212) are made of copper alloy material.

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