A flexible device for clamping special-shaped thin-walled parts

Abstract

The present invention discloses a flexible device for clamping special-shaped thin-walled parts, belonging to the technical field of machine tool fixture design. The flexible device includes a fixture body, a base plate and a magnetorheological fluid, wherein the base plate is connected to a machine tool workbench through the fixture body; the fixture body includes a bottom plate and surrounding plates; the open cavity formed by the bottom plate and the surrounding plates is used to store the magnetorheological fluid; the sides of the surrounding plates are provided with threaded through holes, and the pipe joints are fixedly connected to the surrounding plates through threads; the sides of the surrounding plates are provided with a plurality of rectangular grooves, and coils are respectively wound in the rectangular grooves. The flexible device for clamping special-shaped thin-walled parts completely envelops the shape or inner cavity of the part by utilizing the free fluidity of the magnetorheological fluid under a zero magnetic field, and then rheologically transforms into a high-viscosity solid state under a strong magnetic field, thereby achieving stable and firm clamping of the part; and avoiding clamping deformation of the thin-walled part.

Description

Technical Field

[0001] The invention relates to the technical field of machine tool fixture design, in particular to a flexible device for clamping special-shaped thin-walled parts. Background Art

[0002] As mechanical products are increasingly developing towards lightweight, complex, integrated and good human-machine interaction, more and more product parts are adopting the design concept of irregular shaped structures and thin-walled structural parts. Such parts are mostly cut by machining centers and other equipment during production and processing. During cutting, in order to ensure the processing quality and consistency of the parts, the parts must be stably, firmly and accurately clamped on the machine tool workbench. However, the machine tool workbench is generally a standard structure and does not have good flexibility. It is impossible to clamp the parts directly. An intermediate connection device needs to be introduced to ensure that the relative position of the machine tool workbench and the parts is fixed.

[0003] As an intermediate device connecting the machine tool workbench and the parts, the fixture generally has a standard interface for connecting to the machine tool workbench and a special interface for connecting to the parts. When in use, it is fixedly connected to the machine tool workbench through the standard interface and fixedly connected to the parts through the special interface, which indirectly realizes the stable, firm and precise clamping of the parts on the machine tool workbench. Since the parts of different products have different shapes and specifications, the corresponding fixtures need to match the corresponding interfaces. However, fixtures are mostly made of rigid solid materials, and often one fixture can only correspond to one part, and it does not have clamping flexibility; and it is often necessary to apply a certain clamping force to the parts to ensure their stable and firm clamping, which can easily cause deformation of thin-walled structural parts and affect the processing quality. Summary of the invention

[0004] The purpose of the present invention is to provide a flexible device for clamping special-shaped thin-walled parts, so as to solve the problem that the existing machine tool fixtures have no clamping flexibility when clamping special-shaped thin-walled structural parts, and easily cause deformation of the parts, thereby affecting the processing quality.

[0005] In order to solve the above technical problems, the present invention provides a flexible device for clamping special-shaped thin-walled parts, comprising a fixture body, a base plate and a magnetorheological fluid, wherein the base plate is connected to a machine tool workbench through the fixture body;

[0006] The clamp body comprises a bottom plate and surrounding plates, both of which are an integral structure;

[0007] The open cavity formed by the bottom plate and the surrounding plates is used to store the magnetorheological fluid;

[0008] The side surfaces of the surrounding panels are provided with threaded through holes, and the pipe joints are fixedly connected to the surrounding panels through threads;

[0009] A plurality of rectangular grooves are formed on the side surfaces of the surrounding panels, and coils are respectively wound in the rectangular grooves.

[0010] Optionally, waist-shaped grooves are respectively opened on both sides of the base plate, and the base plate is fixedly connected to the machine tool workbench by T-bolts or screws.

[0011] Optionally, the base plate is provided with a plurality of T-slots, positioning holes and threaded blind holes, which are respectively used to connect standard fasteners, positioning members, guide members and support members.

[0012] Optionally, positioning pins are provided on the base plate for positioning special-shaped thin-walled parts.

[0013] Optionally, a positioning plate is slidably connected to the base plate via set screws to support and position special-shaped thin-walled parts.

[0014] Optionally, a through hole is provided in the middle of the pipe joint, which is connected to an open cavity formed by the bottom plate and the surrounding panels; and a thread is provided on the outer circumference of the pipe joint for connecting a hose that guides the magnetorheological fluid.

[0015] Optionally, a sealing plug is tightly fitted on a side of the pipe joint away from the clamp body, and the sealing plug is interference fit with the through hole.

[0016] The present invention provides a flexible device for clamping special-shaped thin-walled parts, including a fixture body, a base plate and a magnetorheological fluid, wherein the base plate is connected to a machine tool workbench through the fixture body; the fixture body includes a bottom plate and surrounding plates, which are integral structures; the open cavity formed by the bottom plate and the surrounding plates is used to store the magnetorheological fluid; the sides of the surrounding plates are provided with threaded through holes, and the pipe joints are fixedly connected to the surrounding plates through threads; the sides of the surrounding plates are provided with a plurality of rectangular grooves, and coils are respectively wound in the rectangular grooves. The flexible device for clamping special-shaped thin-walled parts completely envelops the shape or inner cavity of the part by utilizing the free flow of the magnetorheological fluid under zero magnetic field, and then rheologically transforms into a high-viscosity solid state under a strong magnetic field, thereby achieving stable and firm clamping of the part; at the same time, when the magnetorheological fluid is rheological, its volume does not change significantly, that is, no clamping force is generated on the part, but a contour-based nested clamping is performed, rather than a force clamping, thereby avoiding the clamping deformation of the thin-walled part. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a top view of a flexible device for clamping special-shaped thin-walled parts provided by the present invention;

[0018] Figure 2 It is a left view of a flexible device for clamping special-shaped thin-walled parts provided by the present invention;

[0019] Figure 3 It is a cross-sectional view of a flexible device for clamping special-shaped thin-walled parts provided by the present invention. DETAILED DESCRIPTION

[0020] The following is a further detailed description of a flexible device for clamping special-shaped thin-walled parts proposed by the present invention in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0021] Embodiment 1

[0022] The present invention provides a flexible device for clamping special-shaped thin-walled parts, such as Figure 1-3 As shown, it includes a fixture body 1, a base plate 2 and a magnetorheological fluid 10, and the base plate 2 is connected to the machine tool workbench through the fixture body 1; the fixture body 1 includes a bottom plate 1f and surrounding plates 1g, and the two are an integral structure; the open cavity formed by the bottom plate 1f and the surrounding plates 1g is used to store the magnetorheological fluid 10; the surrounding plates 1g are provided with threaded through holes on the sides, and the pipe joints 3 are fixedly connected to the surrounding plates 1g through threads; the surrounding plates 1g are provided with a plurality of rectangular grooves on the sides, and coils are respectively wound in the rectangular grooves; the rectangular grooves surround the surrounding plates 1g And evenly distributed in the vertical direction, they are the first rectangular groove 1a, the second rectangular groove 1b, the third rectangular groove 1c, the fourth rectangular groove 1d and the fifth rectangular groove 1e, in which the first rectangular groove 1a, the second rectangular groove 1b, the third rectangular groove 1c, the fourth rectangular groove 1d and the fifth rectangular groove 1e are respectively wound with the first coil 5a, the second coil 5b, the third coil 5c, the fourth coil 5d and the fifth coil 5e (the first coil 5a, the second coil 5b, the third coil 5c, the fourth coil 5d and the fifth coil 5e form a coil group 5), as shown Figure 2 and Figure 3 shown.

[0023] For details, please continue to refer to Figure 1 , waist-shaped grooves 1k are respectively opened on both sides of the base plate 1f, and the base plate 1f is fixedly connected to the machine tool workbench by T-bolts or screws; a number of T-slots 1h, positioning holes 1i and threaded blind holes 1j are provided on the base plate 2, which are respectively used to connect standard fasteners, positioning parts, guide parts and support parts to achieve precise positioning of special-shaped thin-walled parts on the base plate 2; a positioning pin 6 is provided on the base plate 2 for initially positioning the special-shaped thin-walled parts 7, and a positioning plate 8 is slidably connected to the base plate 2 by a set screw 9 for supporting and positioning the special-shaped thin-walled parts 7.

[0024] Specifically, Figure 3 As shown, a through hole 3a is provided in the middle of the pipe joint 3, which is connected to the open cavity formed by the bottom plate 1f and the surrounding plates 1g; a thread 3b is provided on the outer circumference of the pipe joint 3, which is used to connect a hose that guides the magnetorheological fluid 10; a sealing plug 4 is tightly fitted on the side of the pipe joint 3 away from the fixture body 1, and the sealing plug 4 is interference fit with the through hole 3a.

[0025] For details, please continue to refer to Figure 1-3 The present invention uses the magnetorheological fluid 10 stored in the fixture body 1 as a clamping body, and various fasteners, positioning parts, guide parts, support parts and other combined elements installed on the base plate 2 as positioning bodies to clamp special-shaped thin-walled parts. For special-shaped thin-walled parts with different structures, it is only necessary to build the positioning bodies accordingly. As the clamping body is produced by utilizing the free-flowing filling characteristics of the magnetorheological fluid 10, there is no need for targeted design. It is only necessary to ensure the liquid level of the magnetorheological fluid 10. After the coil group 5 is energized, the magnetorheological fluid 10 will flow, thereby realizing flexible clamping of special-shaped thin-walled parts. The specific working process is described as follows:

[0026] First, pass the T-bolt or screw through the waist-shaped groove 1k to fix the clamp body 1 on the machine tool workbench; fix the base plate 2 in the clamp body 1 by bolts; screw the sealing plug 4 into the through hole 3a of the pipe joint 3 to seal the cavity of the clamp body 1; then, according to the processing requirements of the special-shaped thin-walled parts to be processed, use the T-slot 1h, the positioning hole 1i, and the threaded blind hole 1j to assemble the positioning body on the base plate 2 to position the special-shaped thin-walled parts; then inject an appropriate amount of the magnetorheological fluid 10 into the cavity of the clamp body 1 and ensure that the special-shaped thin-walled parts are partially highly immersed in the magnetorheological fluid 10, and energize the coil group 5, and combine the processing process to clamp According to the force requirements and the height of the liquid level of the magnetorheological fluid 10, one or more coils among the coils 5a~5e are selected to be energized, and a suitable current size is set, a strong magnetic field is generated in the cavity of the clamping body 1, and the magnetorheological fluid 10 is converted from a low-viscosity, high-flow liquid state to a high-viscosity, low-flow quasi-solid state to clamp the special-shaped thin-walled parts, and the special-shaped thin-walled parts are processed in this state; after the processing is completed, the chips and cutting fluid remaining in the cavity are cleared, the coil group 5 is powered off, there is no magnetic field in the cavity of the clamping body 1, the magnetorheological fluid 10 is restored to a low-viscosity, high-flow liquid state, and the sealing plug 4 is unscrewed to discharge the magnetorheological fluid 10 from the cavity of the clamping body 1.

[0027] The above embodiment is only a specific application of a preferred structural feature of a shaped thin-walled part on the flexible device proposed in the present invention for clamping shaped thin-walled parts. When replaced with a shaped thin-walled part with other structural features, it is only necessary to reassemble and rebuild the positioning body composed of the positioning pin 6, the positioning plate 8, and the locking screw 9, and no other changes are required to achieve stable, firm and precise clamping of the shaped thin-walled parts on the machine tool workbench.

[0028] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A flexible device for clamping special-shaped thin-walled parts, characterized in that: It comprises a fixture body (1), a base plate (2) and a magnetorheological fluid (10), wherein the base plate (2) is connected to a machine tool workbench through the fixture body (1); The clamp body (1) comprises a bottom plate (1f) and surrounding plates (1g), both of which are an integral structure; The open cavity formed by the bottom plate (1f) and the surrounding plates (1g) is used to store the magnetorheological fluid (10); The side surface of the surrounding panel (1g) is provided with a threaded through hole, and the pipe joint (3) is fixedly connected to the surrounding panel (1g) through threads; The sides of the surrounding plates (1g) are provided with a plurality of rectangular grooves, and coils are respectively wound in the rectangular grooves; The base plate (2) is provided with a plurality of T-slots (1h), positioning holes (1i) and threaded blind holes (1j), which are respectively used to connect standard fasteners, positioning parts, guide parts and support parts; The base plate (2) is provided with positioning pins (6) for positioning the special-shaped thin-walled parts (7); The base plate (2) is slidably connected to a positioning plate (8) via a set screw (9) for supporting and positioning the special-shaped thin-walled part (7); It also includes the following working processes: First, a T-bolt or a screw is passed through a waist-shaped groove (1k) to fix the clamp body (1) on the machine tool workbench; the base plate (2) is fixed in the clamp body (1) by means of bolts; the sealing plug (4) is screwed into the through hole (3a) of the pipe joint (3) to seal the cavity of the clamp body (1); then, according to the processing requirements of the special-shaped thin-walled workpiece to be processed, a positioning body is assembled on the base plate (2) using a T-shaped groove (1h), a positioning hole (1i), and a threaded blind hole (1j) to position the special-shaped thin-walled workpiece; then, an appropriate amount of magnetorheological fluid (10) is injected into the cavity of the clamp body (1) to ensure that the special-shaped thin-walled workpiece is partially immersed in the magnetorheological fluid (10), and the coil group (5) is energized, and combined with the processing process, the positioning body is assembled on the base plate (2) to position the special-shaped thin-walled workpiece. According to the requirements of the clamping force and the height of the liquid level of the magnetorheological fluid (10), one or more coils among the coils 5a-5e are selected to be energized and the appropriate current size is set, so that a strong magnetic field is generated in the cavity of the clamping body (1), and the magnetorheological fluid (10) is converted from a low-viscosity, high-flow liquid state to a high-viscosity, low-flow quasi-solid state, so as to clamp the special-shaped thin-walled parts, and the special-shaped thin-walled parts are processed while maintaining this state; finally, after the processing is completed, the chips and cutting fluid remaining in the cavity are cleared, and the coil group (5) is powered off, so that there is no magnetic field in the cavity of the clamping body (1), and the magnetorheological fluid (10) is restored to a low-viscosity, high-flow liquid state, and the sealing plug (4) is unscrewed to discharge the magnetorheological fluid (10) from the cavity of the clamping body (1).

2. A flexible device for clamping special-shaped thin-walled parts as claimed in claim 1, characterized in that: Waist-shaped grooves (1k) are respectively provided on both sides of the bottom plate (1f), and the bottom plate (1f) is fixedly connected to the machine tool workbench by T-bolts or screws.

3. A flexible device for clamping special-shaped thin-walled parts as claimed in claim 1, characterized in that: The pipe joint (3) has a through hole (3a) in the middle thereof, which is connected to an open cavity formed by the bottom plate (1f) and the surrounding plates (1g); the pipe joint (3) has a thread (3b) on its outer circumference, which is used to connect a hose that guides the magnetorheological fluid (10).

4. A flexible device for clamping special-shaped thin-walled parts as claimed in claim 3, characterized in that: A sealing plug (4) is tightly fitted on the side of the pipe joint (3) away from the clamp body (1), and the sealing plug (4) is interference fit with the through hole (3a).

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