A clamping device for machining deep holes of shaft parts

Abstract

The utility model discloses a kind of clamping devices for shaft parts deep hole machining, including machine tool and the connecting shaft of being set in machine tool output end, clamping device for shaft parts deep hole machining further includes clamping unit and deviation rectifying unit;Clamping unit is set on machine tool;Clamping unit is used to clamp connecting shaft on machine tool, in working condition, clamping unit can be constrained to the radial freedom of connecting shaft when rotating, deviation rectifying unit is set on machine tool, in working condition, deviation rectifying unit can be in real time detection connecting shaft radial swing and exert deviation rectifying force when connecting shaft rotates, to compensate the radial deviation of connecting shaft, the device solves the basic swing problem of connecting shaft when high speed rotates, reaches for deep hole machining establishes stable rotation reference, improves processing system rigidity, creates basic condition for subsequent finish machining Technical effect.

Description

Technical Field

[0001] This utility model relates to the field of machine tool processing technology, and more specifically, it relates to a clamping device for deep hole machining of shaft parts. Background Technology

[0002] In the field of shaft component manufacturing, deep hole machining is a critical and extremely challenging process. Deep hole machining typically requires machining holes in shaft components with a depth-to-diameter ratio greater than 5. This type of machining places extremely stringent requirements on machining accuracy, surface quality, and machining efficiency.

[0003] Currently, in the deep hole machining technology for shaft parts, the clamping device is one of the key components ensuring the stability and precision of the machining process. However, the widely used clamping devices have significant technical defects when dealing with high-speed rotation of the connecting shaft. Specifically, when the connecting shaft is rotating at high speed, due to factors such as uneven mass distribution, manufacturing errors, and unavoidable clearances during assembly, a basic wobble problem will occur. This basic wobble includes not only radial runout but may also involve slight axial movement.

[0004] The fundamental wobble of the connecting shaft has multiple negative impacts on deep hole machining. From a machining accuracy perspective, fundamental wobble causes dynamic changes in the relative position between the tool and the workpiece, making it difficult to guarantee the dimensional accuracy of the machined deep hole. This can lead to problems such as out-of-tolerance hole diameter and increased roundness error, severely affecting the assembly performance and reliability of shaft parts. Regarding surface quality, fundamental wobble causes the tool to experience uneven cutting forces during machining, resulting in defects such as ripples and scratches on the hole wall surface, reducing the surface roughness grade of the part. Furthermore, fundamental wobble accelerates tool wear, shortens tool life, increases machining costs, and significantly reduces machining efficiency due to the need for frequent tool changes and machining parameter adjustments. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a clamping device for deep hole machining of shaft parts that can reduce the shaking of the connecting shaft.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This utility model is further configured to include a machine tool and a connecting shaft disposed at the output end of the machine tool. The clamping device for deep hole machining of shaft parts further includes a clamping unit and a correction unit. The clamping unit is disposed on the machine tool. The clamping unit is used to clamp the connecting shaft on the machine tool. In the working state, the clamping unit can constrain the radial degree of freedom of the connecting shaft when it rotates. The correction unit is disposed on the machine tool. In the working state, the correction unit can detect the radial wobble of the connecting shaft in real time and apply a correction force to compensate for the radial offset of the connecting shaft when it rotates.

[0007] By adopting the above technical solution, the problem of basic shaking of the connecting shaft during high-speed rotation was solved, achieving the technical effects of establishing a stable rotational reference for deep hole machining, improving the rigidity of the machining system, and creating basic conditions for subsequent precision machining.

[0008] The present invention is further configured such that: the clamping unit includes a first sliding part, a first mounting part, and a bearing part; the first sliding part is slidably disposed on the machine tool and is located below the connecting shaft; the first mounting part has a pair and is respectively disposed on the top left and right sides of the first sliding part; the bearing part is disposed on the top of the first sliding part and is located between the pair of first mounting parts, and the top side of the bearing part is provided with an abutment opening, and the abutment opening faces the connecting shaft.

[0009] The present invention is further configured such that: the correction unit includes a positioning part and a detection part; the positioning part is disposed on the top of the first sliding part and is located above the connecting shaft; the detection part is installed on the side of the positioning part and is used to detect the radial wobble of the connecting shaft.

[0010] The present invention is further configured such that: the correction unit also includes a sliding limiting displacement part, a spherical connector, an abutment limiting part, and a rotating contact part; the sliding limiting displacement part has a pair and is slidably disposed on the top of the first sliding part, and the pair of sliding limiting displacement parts are both located between the pair of first mounting parts; the spherical connector is disposed on the top of the pair of sliding limiting displacement parts; the abutment limiting part is rotatably disposed on the spherical connector and is located on the left and right sides of the connecting shaft; the rotating contact part has multiple parts and is rotatably disposed on the abutment limiting part, and the abutment limiting part is provided with multiple spherical grooves for the rotating contact part to rotate, and in the working state, the rotating abutment part can be in a rotating abutment state with the outer side of the connecting shaft.

[0011] The present invention is further configured such that: the correction unit also includes a positioning plate and a damping spring; the positioning plate has a pair and is respectively disposed on both sides of the first sliding part; the damping spring has a pair and is respectively slidably disposed on the positioning plate, and one end of each pair of damping springs is fixedly connected to the side of the sliding limiting displacement part, so that when the sliding limiting displacement part moves, it can drive the damping spring to be in a compressed state.

[0012] The present invention is further configured such that: the correction unit also includes a setting plate; the setting plate is installed on the abutting and limiting part by fasteners, and the end face of the setting plate is provided with a plurality of abutting grooves for abutting and installing the rotating contact part into the spherical groove.

[0013] The present invention is further configured such that: the correction unit also includes an electric push rod and a connecting part; the electric push rod is a pair and is respectively disposed on the machine tool, and both electric push rods are located on the side of the first sliding part; the connecting part is respectively disposed at the output end of the electric push rod, and the other end of the connecting part is fixedly connected to the first sliding part.

[0014] By adopting the above technical solution, the problems of radial deviation and dynamic shaking of the connecting shaft caused by static factors when unloaded and by cutting force during machining are solved. This achieves the effect of building a stable initial reference for high-precision machining and realizing online real-time compensation during machining, ensuring that the rotational accuracy of the connecting shaft is always within the allowable range.

[0015] In summary, this application includes at least one of the following beneficial technical effects: By setting up a clamping unit, the problem of basic shaking of the connecting shaft during high-speed rotation was solved, achieving the technical effects of establishing a stable rotational reference for deep hole machining, improving the rigidity of the machining system, and creating basic conditions for subsequent precision machining.

[0016] By setting up a correction unit, the radial deviation and dynamic wobbling of the connecting shaft caused by static factors when unloaded and by cutting force during machining are solved. This achieves the effect of building a stable initial reference for high-precision machining and realizing online real-time compensation during machining, ensuring that the rotational accuracy of the connecting shaft is always within the allowable range. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of a clamping device for deep hole machining of shaft parts according to the present invention; Figure 2 This is a front view of a clamping device for deep hole machining of shaft parts according to the present invention; Figure 3 This is a three-dimensional structural diagram of the clamping unit of a clamping device for deep hole machining of shaft parts according to the present invention; Figure 4 This is a three-dimensional structural diagram of the correction unit of a clamping device for deep hole machining of shaft parts according to the present invention; Figure 5 This is a three-dimensional structural view of the setting plate and the rotating contact part of the clamping device for deep hole machining of shaft parts according to the present invention, in a disassembled state; Figure 6 This is a top view of a clamping device for deep hole machining of shaft parts according to the present invention; Figure 7 for Figure 6 Enlarged structural diagram at point A in the middle; Explanation of reference numerals in the attached drawings: 1. Machine tool; 2. Connecting shaft; 3. Clamping unit; 31. First sliding part; 32. First mounting part; 33. Bearing part; 4. Correction unit; 41. Positioning part; 42. Detection part; 43. Sliding displacement limiting part; 44. Spherical connector; 45. Abutment limiting part; 46. Rotational contact part; 47. Positioning plate; 48. Damping spring; 49. Setting plate; 491. Electric push rod; 492. Connecting part. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0020] Please see Figure 1-7 The present invention provides the following technical solution: Example 1: In order to solve the problem that the straightness of the deep hole, the roughness of the hole wall, and the instability of small-diameter deep holes in the workpiece process lead to the decrease in machining accuracy caused by radial wobble when the connecting shaft 2 rotates at high speed in the prior art.

[0021] The device includes a machine tool 1 and a connecting shaft 2 disposed at the output end of the machine tool 1. The clamping device for deep hole machining of shaft parts also includes a clamping unit 3 and a correction unit 4. The clamping unit 3 is disposed on the machine tool 1. The clamping unit 3 is used to clamp the connecting shaft 2 on the machine tool 1. In the working state, the clamping unit 3 can constrain the radial degree of freedom of the connecting shaft 2 when it rotates. The correction unit 4 is disposed on the machine tool 1. In the working state, the correction unit 4 can detect the radial wobble of the connecting shaft 2 in real time when it rotates and apply a correction force to compensate for the radial offset of the connecting shaft 2.

[0022] The clamping unit 3 first provides basic radial constraint on the connecting shaft 2, stably clamping it at the output end of the machine tool 1 to form a stable rotational load. This solves the problem of basic wobbling of the connecting shaft 2 during high-speed rotation, achieving the technical effects of establishing a stable rotational reference for deep hole machining, improving the rigidity of the machining system, and creating basic conditions for subsequent finishing.

[0023] See Figure 3The clamping unit 3 includes a first sliding part 31, a first mounting part 32, and a bearing part 33. The first sliding part 31 is slidably disposed on the machine tool 1 and is located below the connecting shaft 2. The first mounting part 32 has a pair and is respectively disposed on the top left and right sides of the first sliding part 31. The bearing part 33 is disposed on the top of the first sliding part 31 and is located between the pair of first mounting parts 32. The top side of the bearing part 33 has an abutment opening, and the abutment opening faces the connecting shaft 2.

[0024] The first sliding part 31 can move longitudinally along the guide rail of the machine tool 1, realizing rapid adjustment and precise positioning of the overall position of the clamping unit 3. Once the position is determined, the bearing part 33 provides the main support surface for the connecting shaft 2 through the arc-shaped abutment opening at its top. The shape of this opening matches the outer diameter of the connecting shaft 2, effectively distributing the load when the connecting shaft 2 rotates. This ensures the basic constraint of the clamping unit 3 on the radial degree of freedom of the connecting shaft 2, and also provides installation space for the subsequent correction unit 4.

[0025] See Figure 4 and Figure 5 The correction unit 4 includes a positioning part 41 and a detection part 42. The positioning part 41 is disposed on the top of the first sliding part 31 and is located above the connecting shaft 2. The detection part 42 is installed on the side of the positioning part 41 and is used to detect the radial wobble of the connecting shaft 2.

[0026] In this embodiment, a controller connected to the detection unit 42 is provided on the machine tool 1, and the detection unit 42 is preferably a displacement sensor.

[0027] Example 2 addresses the issue that most existing technologies employ clamping and buffering methods to limit the stability of the connecting shaft 2 during rotation. This method applies a static constraint force to the connecting shaft 2 to suppress radial displacement during rotation, thereby ensuring the machining accuracy of the workpiece.

[0028] However, this method has the following drawbacks: First, the correction mechanism is passive and lagging, only providing fixed constraint force and lacking targeted active correction capability, making it difficult to effectively compensate for dynamically changing radial wobble. Second, hard contact causes damage. When the connecting shaft 2 wobbles radially, it will make hard contact and collision with the clamping or buffering mechanism. Long-term use can easily cause permanent damage to the contact working surface of the clamping mechanism, while also aggravating the wear of the connecting shaft 2 itself.

[0029] See Figure 4 and Figure 5The correction unit 4 also includes a sliding displacement limiting part 43, a spherical connector 44, an abutment limiting part 45, and a rotating contact part 46. The sliding displacement limiting part 43 has a pair and is slidably disposed on the top of the first sliding part 31, and the pair of sliding displacement limiting parts 43 are located between a pair of first mounting parts 32. The spherical connector 44 is disposed on the top of the pair of sliding displacement limiting parts 43. The abutment limiting part 45 is rotatably disposed on the spherical connector 44 and is located on the left and right sides of the connecting shaft 2. The rotating contact part 46 has a plurality of parts and is rotatably disposed on the abutment limiting part 45, and the abutment limiting part 45 is provided with a plurality of spherical grooves for the rotating contact part 46 to rotate. In the working state, the rotating abutment part can rotate and abut against the outer side of the connecting shaft 2.

[0030] First, a pair of sliding limiting displacement parts 43 are subjected to force and drive the spherical connector 44 and its connected abutment limiting part 45 and rotating contact part 46 to move as a whole toward the connecting shaft 2 until the rotating contact part 46 forms a stable abutment with the outer surface of the connecting shaft 2.

[0031] In the contact state, the rotating contact portion 46 in this embodiment is preferably a bearing ball, and the rotating contact portion 46 and the contact limiting portion 45 form a rotating connection. When the connecting shaft 2 rotates and wobbles, the bearing ball can rotate accordingly, converting sliding friction into rolling friction, effectively reducing wear.

[0032] The spherical connector 44 and the sliding displacement limiting part 43 form a ball joint, allowing the abutment limiting part 45 and the rotating contact part 46 to achieve multi-degree-of-freedom directional adjustment. When the connecting shaft 2 continues to wobble radially, the rotating contact part 46 can maintain the abutment state while moving synchronously with the wobble direction of the connecting shaft 2 in real time, which not only ensures a continuous and effective limiting effect, but also avoids damage caused by rigid collisions.

[0033] See Figure 5 The correction unit 4 also includes a positioning plate 47 and a damping spring 48; the positioning plate 47 is a pair and is respectively disposed on both sides of the first sliding part 31; the damping spring 48 is a pair and is respectively slidably disposed on the positioning plate 47, and one end of each pair of damping springs 48 is fixedly connected to the side of the sliding limiting displacement part 43, so that when the sliding limiting displacement part 43 moves, it can drive the damping spring 48 to be in a compressed state.

[0034] When the sliding displacement limiting part 43, the spherical connector 44, the abutment limiting part 45, and the rotational contact part 46 are in a following abutment state against the connecting shaft 2, the radially wobbling connecting shaft 2 can drive the damping spring 48 connected to the sliding displacement limiting part 43 to be in a compressed state. In this state, the damping spring 48 can push the sliding displacement limiting part 43, the spherical connector 44, the abutment limiting part 45, and the rotational contact part 46 to be in a following abutment state against the connecting shaft 2, which is used to initially limit the radial wobbling of the connecting shaft 2.

[0035] See Figure 5 The correction unit 4 also includes a setting plate 49; the setting plate 49 is mounted on the abutment limiting part 45 by fasteners, and the end face of the setting plate 49 is provided with a plurality of abutment grooves for abutting and installing the rotating contact part 46 into the spherical groove.

[0036] When it is necessary to disassemble and replace the worn rotating contact part 46, the operator uses tools to remove the fasteners. After disassembly, the mounting plate 49 can be separated from the abutment restraint part 45, and the rotating contact part 46 will begin to fall off. At this time, the operator can quickly install and replace each rotating contact part 46 according to its wear condition.

[0037] See Figure 6 and Figure 7 The correction unit 4 also includes an electric push rod 491 and a connecting part 492; the electric push rod 491 is a pair and is respectively disposed on the machine tool 1, and both electric push rods 491 are located beside the first sliding part 31; the connecting part 492 is respectively disposed at the output end of the electric push rod 491, and the other end of the connecting part 492 is fixedly connected to the first sliding part 31.

[0038] In this embodiment, the processing of the workpiece is divided into two working states: an unloaded pre-inspection and calibration stage and a processing dynamic correction stage.

[0039] During the no-load pre-calibration stage, machine tool 1 is started before the formal machining of shaft parts, allowing connecting shaft 2 to idle. During this period, detection unit 42 monitors the radial runout of connecting shaft 2 in real time and transmits the acquired runout signal to controller. Based on this signal, controller accurately calculates the phase and force required for correction, and then drives a pair of electric push rods 491. The electric push rods 491, through connecting part 492, push the first sliding part 31, sliding displacement limiting part 43, spherical connector 44, abutment limiting part 45, and rotating contact part 46 toward connecting shaft 2, and apply a stable and continuous pre-tightening abutment force at the corresponding phase. This process can eliminate the radial deviation caused by static imbalance and assembly clearance before connecting shaft 2 bears the cutting load, establishing a stable initial reference for high-precision machining.

[0040] During the dynamic correction stage of machining, once the machining dynamic correction stage begins, the connecting shaft 2 may experience dynamic wobbling due to the continuously changing cutting force during deep hole machining. The detection unit 42 continuously monitors the real-time position of the connecting shaft 2. Once it detects that the radial wobbling exceeds the permissible range, the controller immediately dynamically adjusts the output of the electric actuator 491 based on the feedback signal. The electric actuator 491 drives the first sliding part 31, the sliding displacement limiting part 43, the spherical connector 44, the abutment limiting part 45, and the rotational contact part 46 to move towards the connecting shaft 2 through the connecting part 492. This movement direction gradually approaches the rotational power direction of the connecting shaft 2, and can apply a synchronous dynamic abutment force at the center and source position of the radial wobbling when the connecting shaft 2 rotates, thereby actively counteracting the wobbling and achieving an online real-time compensation effect during machining, thus ensuring that the rotational accuracy of the connecting shaft 2 is always within the permissible range. This invention solves the problems of radial deviation and dynamic wobbling of connecting shaft 2 caused by static factors when unloaded and by cutting force during machining. It achieves the effect of establishing a stable initial reference for high-precision machining and realizing online real-time compensation during machining, ensuring that the rotational accuracy of connecting shaft 2 is always within the allowable range.

[0041] Obviously, the embodiments described above are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

Claims

1. A clamping device for deep hole machining of shaft parts, comprising a machine tool (1) and a connecting shaft (2) disposed at the output end of the machine tool (1), characterized in that: The clamping device for deep hole machining of shaft parts also includes a clamping unit (3) and a correction unit (4); The clamping unit (3) is mounted on the machine tool (1); The clamping unit (3) is used to clamp the connecting shaft (2) on the machine tool (1). In the working state, the clamping unit (3) can constrain the radial degree of freedom of the connecting shaft (2) when it rotates. The correction unit (4) is installed on the machine tool (1). In the working state, the correction unit (4) can detect the radial wobble of the connecting shaft (2) in real time and apply correction force to compensate for the radial offset of the connecting shaft (2) when the connecting shaft (2) rotates.

2. The clamping device for deep hole machining of shaft parts according to claim 1, characterized in that: The clamping unit (3) includes a first sliding part (31), a first mounting part (32) and a bearing part (33); the first sliding part (31) is slidably disposed on the machine tool (1) and the first sliding part (31) is located below the connecting shaft (2); the first mounting part (32) has a pair and is respectively disposed on the top left and right sides of the first sliding part (31); the bearing part (33) is disposed on the top of the first sliding part (31) and is located between the pair of first mounting parts (32), and the top side of the bearing part (33) is provided with an abutment opening, and the abutment opening faces the connecting shaft (2).

3. The clamping device for deep hole machining of shaft parts according to claim 2, characterized in that: The correction unit (4) includes a positioning part (41) and a detection part (42); the positioning part (41) is located on the top of the first sliding part (31) and above the connecting shaft (2); the detection part (42) is installed on the side of the positioning part (41) and is used to detect the radial wobble of the connecting shaft (2).

4. The clamping device for deep hole machining of shaft parts according to claim 3, characterized in that: The correction unit (4) also includes a sliding limiting displacement part (43), a spherical connector (44), an abutment limiting part (45), and a rotating contact part (46). The sliding limiting displacement part (43) has a pair and is slidably disposed on the top of the first sliding part (31), and the pair of sliding limiting displacement parts (43) are located between a pair of first mounting parts (32). The spherical connector (44) is disposed on the top of the pair of sliding limiting displacement parts (43). The abutment limiting part (45) is rotatably disposed on the spherical connector (44), and the abutment limiting part (45) is located on the left and right sides of the connecting shaft (2). The rotating contact part (46) has a plurality of rotatably disposed on the abutment limiting part (45), and the abutment limiting part (45) has a plurality of spherical grooves for the rotating contact part (46) to rotate. In the working state, the rotating abutment part can rotate and abut against the outer side of the connecting shaft (2).

5. A clamping device for deep hole machining of shaft parts according to claim 4, characterized in that: The correction unit (4) also includes a positioning plate (47) and a damping spring (48); the positioning plate (47) has a pair and is respectively disposed on both sides of the first sliding part (31); the damping spring (48) has a pair and is respectively slidably disposed on the positioning plate (47), and one end of each pair of damping springs (48) is fixedly connected to the side of the sliding limiting displacement part (43), so that when the sliding limiting displacement part (43) moves, it can drive the damping spring (48) to be in a compressed state.

6. A clamping device for deep hole machining of shaft parts according to claim 5, characterized in that: The correction unit (4) also includes a setting plate (49); the setting plate (49) is mounted on the abutment limiting part (45) by fasteners, and the end face of the setting plate (49) is provided with a plurality of abutment grooves for abutting and installing the rotating contact part (46) into the spherical groove.

7. A clamping device for deep hole machining of shaft parts according to claim 6, characterized in that: The correction unit (4) also includes an electric push rod (491) and a connecting part (492); the electric push rod (491) has a pair and is respectively disposed on the machine tool (1), and the pair of electric push rods (491) are both located on the side of the first sliding part (31); the connecting part (492) is respectively disposed at the output end of the electric push rod (491), and the other end of the connecting part (492) is fixedly connected to the first sliding part (31).

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