Clamping device for slender shaft part

Abstract

The utility model discloses a clamping device for a slender shaft part, which is used for solving the technical problems that a transmission sleeve is deformed due to overlarge clamping force in the current clamping mode of clamping and jacking, and the position degree of a machined hole system is out of tolerance and serious due to the fact that the clamping mode is not firm and the positioning precision is not enough. Belongs to the technical field of milling machining clamps. The clamp comprises a base and a gland, the base comprises a bottom plate and a bottom cover vertically connected with the bottom plate, the bottom cover and the gland are buckled together to form a clamping inner hole, each of the bottom cover and the gland is provided with an arc clamping face with half of the clamping inner hole, the bottom cover is symmetrically provided with a plurality of threaded holes, and the threaded holes are connected with the bottom cover. A plurality of unthreaded holes are symmetrically formed in the gland, the positions of the unthreaded holes correspond to those of the threaded holes one to one, and the bottom cover and the gland are connected and fixed in the mode that bolts sequentially penetrate through the unthreaded holes and the threaded holes.

Description

Technical Field

[0001] The utility model belongs to the technical field of milling fixtures, in particular to high-precision milling of slender shafts, and specifically is a clamping device for slender shaft parts. Background Art

[0002] like Figure 1-3 As shown, the clamping method used for fine milling of transfer sleeves is the traditional one-clip, one-lift clamping method commonly used for milling transfer sleeves for slender shafts. This method uses three jaws to clamp the Ø58 outer diameter, with a top plate supporting the inner hole to be machined, and a tailstock to hold the top plate in place. With this clamping method, the position accuracy required after high-precision hole machining is Φ0.05, but the measured position accuracy is Φ0.2, a significant deviation from the tolerance. This clamping method has the following main disadvantages:

[0003] 1) The transfer sleeve is a slender shaft structure with a through hole in the middle and multiple through slots in the outer shape. The slender hollow structure has poor rigidity. The transfer sleeve itself has a large weight, so a large clamping force is required for a secure clamping. Using a clamping and pushing method can easily cause deformation of the transfer sleeve.

[0004] 2) The three-jaw clamping part has a small area, the distance between the clamping end and the processing end is far, and the large reference is used to position the small reference for processing, resulting in poor clamping accuracy.

[0005] 3) The part to be processed is a long through-groove structure, evenly distributed in three places, with a large amount of removal. After the transfer sleeve is tightened, the deformation caused by the grooving process will be greater. Once the transfer sleeve is tightened, the straightness will deteriorate. The deviation between the processing axis and the reference axis will cause the processing part to deviate from the reference, which cannot meet the position requirements of the processing hole system. Utility Model Content

[0006] The purpose of the utility model is to provide a clamping device for slender shaft parts, which is used to solve the technical problems that the clamping force of the current one-clamp-one-pushing clamping method is too large, resulting in deformation of the transfer sleeve, and the positioning accuracy of the processing hole system is seriously out of tolerance due to the unreliable clamping method and insufficient positioning accuracy.

[0007] The utility model is realized by adopting the following technical solutions:

[0008] A clamping device for a slender shaft part includes a base and a pressure cover, the base includes a bottom plate and a bottom cover vertically connected to the bottom plate, the bottom cover and the pressure cover are buckled together to form a clamping inner hole, and the bottom cover and the pressure cover each have an arc clamping surface of half of the clamping inner hole, the bottom cover is symmetrically provided with a plurality of threaded holes, and the pressure cover is symmetrically provided with a plurality of light holes, the positions of the light holes and the threaded holes correspond one to one, and the bottom cover and the pressure cover are connected and fixed by bolts passing through the light holes and the threaded holes in sequence.

[0009] When in use, first fix the base plate on the workbench of the machine tool, then place the transfer sleeve on the arc clamping surface of the clamping inner hole of the bottom cover, and finally buckle the pressure cover on the bottom cover and tighten the flexible clamping device with bolts.

[0010] Further preferably, the base and the pressure cover are made of aluminum alloy.

[0011] Further preferably, the diameter of the clamping inner hole is φ60 mm.

[0012] Further preferably, the flatness of the base plate is 0.01 mm.

[0013] Further preferably, the bottom cover and the top of the pressure cover are provided with a knife clearance step at the clamping inner hole.

[0014] Further preferably, the bottom cover and the pressure cover are interference fit with the transfer sleeve.

[0015] Further preferably, a vacant slot is provided in the clamping inner hole.

[0016] Further preferably, the cross section of the clamping inner hole formed by the bottom cover and the pressure cover is provided with a notch, and the minimum size of the notch is 1 mm.

[0017] Further preferably, the gland is shaped like a convex character, and the two short platforms of the convex character are platforms for installing bolts, and the bolts are M8*50 bolts.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1) Improve the clamping method to minimize the deformation of the transfer sleeve caused by the clamping force;

[0020] 2) Increase the clamping surface to ensure large reference positioning and improve clamping accuracy;

[0021] 3) Improve the axis consistency between the fixture and the transfer sleeve to be processed.

[0022] 4) Ensure enhanced clamping reliability and benchmark consistency;

[0023] 5) Adjust the process content, improve the accuracy of the clamping part of the transfer sleeve, ensure that the transfer sleeve fits the milling fixture well, and improve the clamping accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0026] Figure 1 A schematic diagram of the transfer sleeve structure is shown.

[0027] Figure 2 Schematic diagram showing the out-of-tolerance position of the transfer sleeve hole system.

[0028] Figure 3 express Figure 2 Cross-sectional view at AA in the middle.

[0029] Figure 4 A schematic diagram of a clamping transfer sleeve of the present invention is shown.

[0030] Figure 5 Schematic diagram of the transfer sleeve grinding process.

[0031] Figure 6 express Figure 4 Explosion diagram.

[0032] In the figure: 1-base, 11-bottom plate, 12-bottom cover, 13-threaded hole, 2-pressure cover, 3-clamping inner hole, 4-bolt, 5-tool step, 6-vacant slot, 7-notch, 8-transfer sleeve, 9-grinding surface. DETAILED DESCRIPTION

[0033] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the scheme of the present invention will be further described below. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0034] In the description, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance. It should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood broadly. For example, they can refer to fixed connections, removable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms based on specific circumstances.

[0035] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present invention, rather than all of the embodiments.

[0036] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0037] A clamping device for a slender shaft part comprises a base 1 and a pressure cover 2. The base 1 comprises a bottom plate 11 and a bottom cover 12 vertically connected to the bottom plate 11.

[0038] The bottom cover 12 and the pressure cover 2 are buckled together to form a clamping inner hole 3, and the bottom cover 12 and the pressure cover 2 each have an arc clamping surface of half of the clamping inner hole 3, and the diameter of the clamping inner hole 3 is φ60mm.

[0039] The bottom cover 12 is symmetrically provided with several threaded holes 13, and the pressure cover 2 is symmetrically provided with several light holes. The positions of the light holes and the threaded holes 13 correspond one to one. The bottom cover 12 and the pressure cover 2 are connected and fixed by bolts 4 passing through the light holes and the threaded holes 13 in sequence. The clamping force can be adjusted by manually tightening the bolts 4.

[0040] The bottom cover 12 and the top of the pressure cover 2 are provided with a tool relief step 5 at the clamping inner hole 3 to avoid interference of the machine tool tool due to the tool radius during processing.

[0041] The base 1 and the pressure cover 2 are made of aluminum alloy, and the bottom cover 12 and the pressure cover 2 have a small interference fit with the transfer sleeve 8. When clamping, the toughness of the aluminum alloy and the small interference fit of the outer circle of the transfer sleeve 8 can achieve a flexible and tight effect similar to a clamping spring when the bolt 4 is tightened. It has the advantages of minimal deformation of the transfer sleeve 8 after clamping, maximum wrapping, and reliable clamping.

[0042] An empty slot 6 is provided in the clamping inner hole 3 to accommodate the portion where the transfer sleeve 8 interferes with the clamping inner hole 3, thereby ensuring that the flexible clamping device is firmly clamped.

[0043] The cross section of the clamping inner hole 3 formed by the bottom cover 12 and the pressure cover 2 is provided with a notch 7 , and the minimum size of the notch 7 is 1 mm.

[0044] like Figure 4 As shown, a platform for mounting bolts 4 is provided on the opposite side of the arc clamping surface of the gland 2 for clamping the inner hole 3, and the bolts 4 are M8*50 bolts 4.

[0045] The manufacturing steps of the flexible clamping device of this embodiment are as follows:

[0046] (1) The base 1 and the pressure cover 2 are processed as a whole. The lathe operator completes the processing of the rotary dimensions of the flexible clamping device. At this time, the clamping inner hole 3φ60 is left with a single-side allowance of 0.3mm. The bottom plate 11 is ensured to have a flatness of 0.01mm by fine milling. Then, the clamping inner hole 3φ60 is finely bored using the finely milled bottom plate 11 as a reference. The bottom plate 11 obtained in this way has a good perpendicularity to the clamping inner hole 3. When the flexible clamping device is pressed against the machine tool workbench, the axis of the transfer sleeve 8 has a high perpendicularity to the bottom surface of the machine tool workbench.

[0047] (2) Mill out the outer shape of the gland 2 and make six threaded holes 13M8.

[0048] (3) Use wire cutting to cut the bottom cover 12 and the pressure cover 2 along the center of the clamping inner hole 3, and the width of the cut surface is 1 mm.

[0049] This embodiment has the following advantages in application:

[0050] 1) The depth of the clamping inner hole 3 and the height of the transfer sleeve 8 mounting surface are close to 1:1, which increases the clamping area while providing reliable wrapping, ensuring large-base positioning processing and improving the consistency of the axes of the flexible clamping device and transfer sleeve 8 after assembly. In other words, the arc clamping surface of the flexible clamping device and the positioning surface of the transfer sleeve 8 are designed to be close to 1:1, improving the center consistency of the fixture and transfer sleeve 8 after assembly, and effectively ensuring the installation accuracy of the fixture assembly and disassembly.

[0051] It should be noted that the flexible clamping device of this embodiment can be used as long as the positioning surface of the transfer sleeve 8 is a large reference surface in itself. It is not a necessary condition that the depth of the positioning surface of the transfer sleeve 8 and the clamping inner hole 3 is close to 1:1.

[0052] 2) The process content and sequence of the processing of the transfer sleeve 8 were improved, and a grinding process was added to the clamping part of the transfer sleeve 8, that is, in the fine turning process, Figure 4 The outer circles of the transfer sleeve 8 shown in the figure have grinding allowances at φ58, φ60 and φ64, and then these three outer circles (grinding surfaces 9) are clamped and ground in place in sequence. Among them, the outer circle of φ60 (selected based on the longest outer circle) is the clamping part, and the tolerance requirement can be as high as The outer circle after grinding not only has good straightness, but also has a high-precision coaxial relationship with both ends of the transfer sleeve 8, laying a precision foundation for the subsequent use of the flexible clamping device.

[0053] The flexible clamping device adopts the longest outer circle of the transfer sleeve 8 for positioning, which avoids the problem of positioning a large reference with a small reference and better ensures the positioning accuracy of the flexible clamping device.

[0054] In this embodiment, the positioning surface and the reference surface of the transfer sleeve 8 are clamped and ground in one step, and have a high coaxiality.

[0055] 3) The clamping surface of the flexible clamping device adopts the design of two semicircular arcs, which increases the contact area between the flexible clamping device and the transfer sleeve 8, so that the clamping force is evenly distributed on the entire positioning surface of the transfer sleeve 8. The inner hole 3 is processed to , with the outer circle of the transfer sleeve 8 With small interference assembly relationship.

[0056] The above description is only a specific embodiment of the present invention, which enables those skilled in the art to understand or implement the present invention. Although detailed descriptions have been made with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents; and such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments, and they should all be covered by the scope of protection of the claims.

Claims

1. A clamping device for a slender shaft part, characterized in that: The invention comprises a base (1) and a pressure cover (2), wherein the base (1) comprises a bottom plate (11) and a bottom cover (12) vertically connected to the bottom plate (11), wherein the bottom cover (12) and the pressure cover (2) are buckled together to form a clamping inner hole (3), and the bottom cover (12) and the pressure cover (2) each have an arc clamping surface of half of the clamping inner hole (3), the bottom cover (12) is symmetrically provided with a plurality of threaded holes (13), and the pressure cover (2) is symmetrically provided with a plurality of light holes, and the positions of the light holes and the threaded holes (13) correspond one to one, and the bottom cover (12) and the pressure cover (2) are connected and fixed by bolts (4) passing through the light holes and the threaded holes (13) in sequence.

2. A clamping device for a slender shaft component according to claim 1, characterized in that: The base (1) and the pressure cover (2) are made of aluminum alloy.

3. The clamping device for a slender shaft component according to claim 1, characterized in that: The diameter of the clamping inner hole (3) is φ60 mm.

4. The clamping device for a slender shaft component according to claim 1, characterized in that: The flatness of the bottom plate (11) is 0.01 mm.

5. The clamping device for a slender shaft component according to claim 1, characterized in that: The bottom cover (12) and the top of the pressure cover (2) are provided with a knife clearance step (5) at the clamping inner hole (3).

6. The clamping device for a slender shaft component according to claim 1, characterized in that: The bottom cover (12) and the pressure cover (2) are interference fit with the transfer sleeve (8).

7. The clamping device for a slender shaft component according to claim 1, characterized in that: A vacant slot (6) is provided in the clamping inner hole (3).

8. A clamping device for an elongated shaft component according to any one of claims 1 to 7, characterized in that: The cross section of the clamping inner hole (3) formed by the bottom cover (12) and the pressure cover (2) is provided with a notch (7), and the minimum size of the notch (7) is 1 mm.

9. A clamping device for a slender shaft component according to any one of claims 1 to 7, characterized in that: The pressure cover (2) is shaped like a convex character, and the two short platforms of the convex character are platforms for installing bolts (4), and the bolts (4) are M8*50 bolts (4).

10. The clamping device for an elongated shaft component according to claim 8, characterized in that: A platform for mounting bolts (4) is provided on one side of the arc clamping surface of the pressure cover (2) that does not have the inner hole (3) clamped thereon, and the bolts (4) are M8*50 bolts (4).

Images