A collet device

Abstract

This utility model relates to the field of cylinder machining fixtures, and discloses a chuck device including a steel ring, a screw, and a U-shaped pad. The steel ring has a radially penetrating threaded hole on its side wall, and the screw is screwed into the threaded hole of the steel ring. The U-shaped pad is U-shaped in overall shape, with a through hole on one side. The bottom surface of the U-shaped pad fits against the end face of the steel ring, and the end of the U-shaped pad away from the through hole forms a pressing arc surface that matches the outer surface of the composite material cylinder to be clamped. The U-shaped pad is also provided with a screw pressing surface. In this utility model, by improving the traditional external pad to a U-shaped pad mounted on the screw, the pad and chuck are integrated, solving the problems of easy loss, misuse, and inconvenient installation of traditional pads. The entire clamping process only requires rotating one screw, eliminating the need for additional pad insertion, significantly shortening clamping time, and making it suitable for mass continuous production.

Description

Technical Field

[0001] This utility model relates to the field of cylinder machining fixtures, and in particular to a chuck device. Background Technology

[0002] In aerospace, weaponry, and shipbuilding industries, resin-based fiber-reinforced composite materials are widely used in the manufacture of cylindrical structural components due to their advantages such as lightweight, high strength, and corrosion resistance. These cylindrical components are typically formed using a mandrel mold and then undergo precision machining on a lathe, grinding machine, or machining center, including processes such as turning, grinding, milling, and drilling. To achieve high-precision machining, the cylindrical component must be securely clamped onto a machining mandrel.

[0003] A typical chuck assembly includes a steel ring with a screw mounted on it. During clamping, a shim is placed between the screw and the cylinder surface to prevent damage to the cylinder surface when the screw presses against it. This commonly used chuck assembly has several drawbacks: First, the shim material is inconsistent, including aluminum foil, copper foil, and composite fiberglass sheets, which differs from the cylinder machining process design and is easily lost, failing to meet production management requirements. Second, inserting the thin shim into the gap between the screw and the cylinder surface each time is difficult; the shim must be held by hand to prevent rotation when the screw is tightened, increasing the workload and wasting time, resulting in low efficiency and increased manufacturing costs for cylinder machining. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a clamping device, which aims to solve the problems of "chaotic and easily lost gasket materials, mixed use, and inconvenient installation" in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a clamping device, comprising a steel ring, a screw, and a U-shaped pad; The steel ring has a radially penetrating threaded hole on its side wall. The screw is screwed into the threaded hole of the steel ring. The U-shaped pad is U-shaped in general. A through hole is provided on one side of the U-shaped pad. The bottom surface of the U-shaped pad fits against the end face of the steel ring. A pressing arc surface is formed at the end of the U-shaped pad away from the through hole. The pressing arc surface matches the outer surface of the composite material cylinder to be clamped.

[0006] As a further description of the above technical solution: The U-shaped pad is provided with a screw clamping surface, and the bottom end of the screw acts on the screw clamping surface.

[0007] As a further description of the above technical solution: The inner diameter of the steel ring and the outer diameter of the composite material cylinder on the machined mandrel are fitted with a small clearance, allowing the chuck device to be fitted onto the outer circumference of the cylinder.

[0008] As a further description of the above technical solution: The U-shaped pad is made of metal or high-strength engineering plastic.

[0009] As a further description of the above technical solution: The steel ring is an integral circular structure made of alloy steel or stainless steel.

[0010] As a further description of the above technical solution: The shape of the screw head matches the screw clamping surface on the U-shaped pad.

[0011] As a further description of the above technical solution: The U-shaped opening of the U-shaped pad faces the central axis of the steel ring. The two arms of the U-shaped pad are located on the inner and outer sides of the side wall of the steel ring, respectively. The through hole is located on one arm of the U-shaped pad, and the other arm of the U-shaped pad is suspended. The pressing arc surface is located at the free end of the suspended arm of the U-shaped pad.

[0012] As a further description of the above technical solution: It also includes fastening screws and fasteners. The fastening screws are threaded onto the inner side wall of the U-shaped pad, and the fasteners are embedded in the inner cavity of the U-shaped pad. The fasteners have a wedge-shaped surface on the side near the through hole.

[0013] This utility model has the following beneficial effects: 1. In this utility model, by improving the traditional external gasket to a U-shaped gasket on the screw, the gasket and the chuck are integrated, which solves the problems of easy loss, misuse, and inconvenient installation of traditional gaskets. The entire clamping process can be completed by rotating only one screw, without the need to insert an additional gasket, which greatly shortens the clamping time and is suitable for mass continuous production.

[0014] 2. In this utility model, the bottom surface of the U-shaped pad is attached to the end face of the steel ring to form a mechanical limit, eliminating the need for manual support, simplifying the operation process, reducing labor intensity, and improving clamping safety through the built-in anti-loosening mechanism. The structure is simple, the operation is efficient, and the repeatability is high. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model; Figure 2 This is a three-dimensional disassembled structural diagram of the steel ring and U-shaped pad in this utility model; Figure 3 This is a three-dimensional disassembled structural diagram of the steel ring and U-shaped pad in this utility model from another perspective; Figure 4This is a three-dimensional cross-sectional view of the screw, U-shaped pad, fastening screw and fastener in this utility model; Figure 5 This is a schematic diagram of the overall planar structure of this utility model; Figure 6 This is a schematic diagram of the overall planar structure of the present invention from another perspective; Figure 7 This is a schematic diagram of the planar structure of the U-shaped pad in this utility model; Figure 8 This is a schematic diagram of the U-shaped pad from another perspective of the present invention.

[0016] Legend: 1. Steel ring; 2. Screw; 3. U-shaped pad; 4. Cylinder; 5. Machining mandrel; 6. Threaded hole; 7. Through hole; 8. Screw clamping surface; 9. Bottom surface; 10. Clamping arc surface; 11. Fastening screw; 12. Fastener; 13. Wedge-shaped surface. Detailed Implementation

[0017] 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 protection scope of the present utility model.

[0018] Reference Figure 1 - Figure 3 One embodiment of this utility model is a clamping device for clamping a resin-based fiber-reinforced composite material cylinder 4 onto a machined mandrel, comprising a steel ring 1, a screw 2, and a U-shaped pad 3; A radially penetrating threaded hole 6 is provided on the side wall of the steel ring 1. The screw 2 is screwed into the threaded hole 6 of the steel ring 1, and the length of the screw 2 extending into the inner cavity of the steel ring 1 can be adjusted axially. The U-shaped pad 3 is U-shaped in general. A through hole 7 is provided on one side of the U-shaped pad 3. The through hole 7 is used to pass through the screw 2, so that the screw 2 does not contact the U-shaped pad 3. The bottom surface 9 of the U-shaped pad 3 is in contact with the end face of the steel ring 1. A pressing arc surface 10 is formed at the end of the U-shaped pad 3 away from the through hole 7. The pressing arc surface 10 matches the outer surface of the composite material cylinder 4 to be clamped, and is used to contact the surface of the cylinder 4 and apply pressure during clamping.

[0019] Reference Figure 4 , Figure 7 and Figure 8The U-shaped pad 3 is provided with a screw clamping surface 8. The bottom end of the screw 2 acts on the screw clamping surface 8. By pressing downward, the U-shaped pad 3 moves downward as a whole, so that the clamping arc surface 10 presses against the outer surface of the cylinder 4. The head shape of the screw 2 matches the screw clamping surface 8 on the U-shaped pad 3 to ensure stable and reliable pressure transmission. The U-shaped pad 3 is made of metal or high-strength engineering plastic, which has sufficient compressive strength and wear resistance. The surface of the clamping arc surface 10 that contacts the cylinder 4 is smooth to avoid damaging the surface of the composite material.

[0020] Reference Figure 5 and Figure 6 The inner diameter of the steel ring 1 and the outer diameter of the composite material cylinder 4 on the machined mandrel 5 are fitted with a small clearance, which allows the chuck device to be fitted around the outer circumference of the cylinder 4. During the clamping process, the cylinder 4 undergoes elastic deformation at two symmetrical clamping points in the diameter direction, achieving an interference fit fixation with the mandrel 5. The steel ring 1 is an integral circular ring structure made of alloy steel or stainless steel. It is heat-treated to improve hardness and rigidity, ensuring that it does not deform during the clamping process.

[0021] Reference Figure 1 - Figure 3 The U-shaped opening of the U-shaped pad 3 faces the central axis of the steel ring 1. The two arms of the U-shaped pad 3 are located on the inner and outer sides of the side wall of the steel ring 1, respectively. The through hole 7 is located on one arm of the U-shaped pad 3, and the other arm of the U-shaped pad 3 is suspended. The pressing arc surface 10 is located at the free end of the suspended arm of the U-shaped pad 3.

[0022] Reference Figure 3 and Figure 4 It also includes a fastening screw 11 and a fastener 12. The fastening screw 11 is threaded to the inner wall of the side of the U-shaped pad 3. The fastener 12 is embedded in the inner cavity of the U-shaped pad 3. The fastener 12 can slide horizontally in the inner cavity of the U-shaped pad 3. The fastener 12 can be installed or removed from the through hole 7. When the fastening screw 11 is rotated, the fastening screw 11 moves closer to the screw rod 2, thereby squeezing the fastener 12, so that the wedge-shaped surface 13 of the fastener 12 is engaged in the thread groove of the screw rod 2, thereby locking the screw rod 2 to prevent loosening. The fastener 12 is provided with a wedge-shaped surface 13 on the side near the through hole 7.

[0023] Working Principle: In use, the resin-based fiber-reinforced composite cylinder 4 is first fitted onto the machined mandrel 5, maintaining a small clearance fit. Then, the chuck is axially inserted into the outer circumference of the cylinder 4. When clamping begins, the screw 2 is rotated, its bottom end gradually pressing against the screw clamping surface 8 on the U-shaped pad 3, pushing the U-shaped pad 3 downwards along the axis of the screw 2. Because the bottom surface 9 of the U-shaped pad 3 is in contact with the end face of the steel ring 1, its rotational freedom is restricted, thus only vertical movement occurs. As the U-shaped pad 3 moves downwards, its free end clamping arc surface 10 contacts and presses against the outer surface of the cylinder 4, forming two symmetrical clamping points along the diameter of the cylinder 4. Under the clamping force, the cylinder 4 undergoes controllable micro-elastic deformation, and the inner hole slightly expands, forming an interference fit with the machined mandrel 5, thereby achieving a secure clamping.

[0024] Then tighten the fastening screw 11. The fastening screw 11 moves along the thread toward the screw 2, pressing the fastener 12, which is embedded in the inner cavity of the U-shaped pad 3 and can slide horizontally, so that the wedge-shaped surface 13 of the fastener 12 is engaged in the thread groove of the screw 2, thereby locking the screw 2 and preventing it from loosening during subsequent processing, ensuring the stability of the clamping, so as to carry out subsequent processing operations such as turning and grinding.

[0025] After processing, first loosen the fastening screw 11 in the reverse direction to release the fastener 12 from locking the screw 2. Then rotate the screw 2 in the reverse direction to release it from the pressure on the U-shaped pad 3. The U-shaped pad 3 moves upward under the elastic restoring force or its own weight of the cylinder 4, and the pressing arc surface 10 is separated from the surface of the cylinder 4. The clamping force is released, and the chuck device can be disassembled from the cylinder 4 to complete one clamping cycle.

[0026] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A chuck device, characterized in that, Includes a steel ring (1), a screw (2), and a U-shaped pad (3); The steel ring (1) has a radially penetrating threaded hole (6) on its side wall. The screw (2) is screwed into the threaded hole (6) of the steel ring (1). The U-shaped pad (3) is U-shaped in general. A through hole (7) is provided on one side of the U-shaped pad (3). The bottom surface (9) of the U-shaped pad (3) is in contact with the end face of the steel ring (1). A pressing arc surface (10) is formed at the end of the U-shaped pad (3) away from the through hole (7). The pressing arc surface (10) matches the outer surface of the composite material cylinder (4) to be clamped.

2. A collet device according to claim 1, wherein: The U-shaped pad (3) is provided with a screw pressing surface (8), and the bottom end of the screw (2) acts on the screw pressing surface (8).

3. The chuck device according to claim 1, characterized in that: The inner diameter of the steel ring (1) and the outer diameter of the composite material cylinder (4) on the machined mandrel (5) are fitted with a small clearance, so that the chuck device can be fitted onto the outer circumference of the cylinder (4).

4. A chuck device according to claim 1, characterized in that: The U-shaped pad (3) is made of metal or high-strength engineering plastic.

5. A chuck device according to claim 1, characterized in that: The steel ring (1) is an integral circular structure made of alloy steel or stainless steel.

6. A chuck device according to claim 1, characterized in that: The head shape of the screw (2) matches the screw clamping surface (8) on the U-shaped pad (3).

7. A chuck device according to claim 1, characterized in that: The U-shaped opening of the U-shaped pad (3) faces the central axis of the steel ring (1). The two arms of the U-shaped pad (3) are located on the inner and outer sides of the side wall of the steel ring (1), respectively. The through hole (7) is located on one side arm of the U-shaped pad (3), and the other side arm of the U-shaped pad (3) is suspended. The pressing arc surface (10) is located at the free end of the suspended side arm of the U-shaped pad (3).

8. A chuck device according to claim 1, characterized in that: It also includes fastening screws (11) and fasteners (12), the fastening screws (11) being threaded onto the inner side wall of the U-shaped pad (3), the fasteners (12) being embedded in the inner cavity of the U-shaped pad (3), and the fasteners (12) having a wedge-shaped surface (13) on the side near the through hole (7).

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