A flexible internal support fixture for machining cylindrical workpieces

Abstract

This utility model discloses a flexible internal support fixture for machining cylindrical workpieces, relating to the field of machining fixture technology. It includes a fixture body comprising a transversely arranged central shaft capable of connecting to a machine tool's conveyor shaft. Five sets of arc-shaped support plates are equidistantly arranged along the circumference of the central shaft. Each set of arc-shaped support plates has an X-shaped support arm rotatably mounted on the inner wall of its curved surface, which is connected to the outer wall of the central shaft. This utility model allows the arc-shaped support plates to extend and retract radially along the central shaft, adapting to tubular workpieces of a certain diameter and length. It supports rapid material changes for the support plates (polyurethane, aluminum, metal, etc.) to accommodate different workpiece materials. It can be linked with an automatic machine tool to automatically clamp and release, improving efficiency and accuracy. It ensures the workpiece's positioning stability during machining, improving machining quality. Simultaneously, the protective components on the end faces prevent metal debris from entering during machining, ensuring smooth extension and retraction of the arc-shaped support plates.

Description

Technical Field

[0001] This utility model relates to the field of machining tooling and fixture technology, specifically a flexible internal support tooling for machining cylindrical workpieces. Background Technology

[0002] In lathe machining of tubular parts (such as steel pipes, aluminum pipes, plastic cylinders, etc.), internal support fixtures are used to provide support and positioning from the inner wall of the workpiece to ensure the accuracy of coaxiality, roundness, etc. during machining.

[0003] The existing technology has the following drawbacks:

[0004] 1. Poor versatility: Most internal support fixtures have a fixed clamping diameter or a narrow adjustment range, which cannot be adapted to different specifications of the same type of pipe workpiece. Frequent tooling changes are required, resulting in low efficiency.

[0005] 2. Insufficient material compatibility: The support plate is made of a single material (such as metal). For workpieces that are easily scratched (aluminum, plastic), the metal support plate is prone to causing surface damage. For workpieces with high rigidity requirements (thick-walled steel pipes), the soft support plate has insufficient support force, which affects the processing accuracy.

[0006] 3. Low level of automation: Clamping / releasing is mostly done manually, which is not only inefficient, but also prone to workpiece positioning deviation due to human error, making it difficult to match the production rhythm of automatic machine tools. Utility Model Content

[0007] Therefore, the purpose of this utility model is to provide a flexible internal support tooling for processing cylindrical workpieces, so as to solve the technical problems mentioned in the background.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a flexible internal support fixture for processing cylindrical workpieces, comprising a fixture body, wherein the fixture body includes a central shaft arranged laterally and capable of being connected to the machine tool conveyor shaft, and five sets of arc support plates are equidistantly arranged on the outer side of the central shaft along its circumferential direction;

[0009] Each set of arc support plates has an X-shaped support arm that is rotatably mounted on the outer wall of the central shaft. The inner wall of the arc support plate is fixed with a first base connected to the end of the X-shaped support arm. The outer wall of the fixture body is provided with a second base connected to the other end of the X-shaped support arm. The end of the fixture body away from the machine tool is provided with an end plate that can be fixed to the tailstock of the machine tool.

[0010] As a preferred technical solution, the outer wall of the end plate is fixed with a protective component that can prevent debris from entering. The protective component includes an inner liner ring fixed to the outer wall of the end plate. The outer wall of the inner liner ring is fitted with five sets of staggered arc-shaped outer frames. Each set of arc-shaped outer frames is fixedly connected to the inner wall of the arc support piece. Each set of arc-shaped outer frames has an outer clearance groove and an inner clearance groove at both ends.

[0011] As a preferred technical solution, the protective component further includes a constraint groove formed on the end face of the inner lining ring, the number of the constraint grooves corresponding to the arc-shaped outer frame, and a constraint post that slides within the constraint groove is fixed inside the arc-shaped outer frame.

[0012] As a preferred technical solution, the central shaft includes a drive shaft and a positioning shaft, and the end faces of the drive shaft and the positioning shaft are reserved with space that allows them to be relatively close to each other.

[0013] As a preferred technical solution, the two sets of second bases and first bases are respectively fixed to the outer walls of the drive shaft and the positioning shaft with bolts, and the arc support plate is fixedly connected to the two sets of first bases with bolts.

[0014] As a preferred technical solution, long straight grooves are provided at the positions where the five sets of second bases on the outer wall of the drive shaft contact the X-shaped support arm, and long grooves corresponding to the long straight grooves are also provided in the first base at the position corresponding to the second base on the inner wall of the arc support plate.

[0015] In summary, the present invention has the following main advantages:

[0016] This utility model features a circular arc support plate that can extend and retract radially along the central shaft, adapting to tubular workpieces of a certain diameter range and length. It supports rapid material changes for the support plate (polyurethane, aluminum, metal, etc.) to accommodate different workpiece materials. When linked with an automatic machine tool, it automatically completes clamping and releasing, improving efficiency and precision. It ensures the positioning stability of the workpiece during processing, improving processing quality. Simultaneously, the protective components on the end face prevent metal debris from entering during processing, ensuring smooth extension and retraction of the circular arc support plate. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a schematic diagram of the arc support plate and central shaft structure of this utility model;

[0019] Figure 3 This is a structural diagram of the arc support plate and base of this utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of the protective component of this utility model.

[0021] In the diagram: 100, fixture body; 110, central shaft; 111, drive shaft; 112, positioning shaft; 120, arc support plate; 130, X-shaped support arm; 140, first base; 150, second base; 151, long straight groove; 160, end plate;

[0022] 200, Protective component; 210, Inner liner ring; 220, Arc-shaped outer frame; 230, Constraint groove; 240, Inner clearance groove; 250, Outer clearance groove. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] The embodiments of this utility model will be described below based on its overall structure.

[0025] A flexible internal support tooling for machining cylindrical workpieces, such as Figures 1 to 4 As shown, the fixture includes a fixture body 100, which includes a central shaft 110 arranged laterally and capable of being connected to the machine tool conveyor shaft. Five sets of arc support plates 120 are equidistantly arranged on the outer side of the central shaft 110 along its circumferential direction.

[0026] Each set of arc support plates 120 has an X-shaped support arm 130 rotatably mounted on the inner wall of the central shaft 110. The inner wall of the arc support plate 120 is fixed with a first base 140 connected to the end of the X-shaped support arm 130. The outer wall of the fixture body 100 is provided with a second base 150 connected to the other end of the X-shaped support arm 130. The end of the fixture body 100 away from the machine tool is provided with an end plate 160 that can be fixed to the tailstock of the machine tool.

[0027] The outer wall of the end plate 160 is fixed with a protective component 200 that can prevent debris from entering. The protective component 200 includes an inner liner ring 210 fixed to the outer wall of the end plate 160. The outer wall of the inner liner ring 210 is fitted with five sets of staggered arc-shaped outer frames 220. Each set of arc-shaped outer frames 220 is fixedly connected to the inner wall of the arc support plate 120. Each set of arc-shaped outer frames 220 has an outer clearance groove 250 and an inner clearance groove 240 at both ends.

[0028] The protective component 200 also includes a constraint groove 230 formed on the end face of the inner liner ring 210. The number of constraint grooves 230 corresponds to the number of arc-shaped outer frames 220. A constraint post that slides within the constraint groove 230 is fixed inside the arc-shaped outer frame 220.

[0029] It is worth noting that the material of the arc support plate 120 can be changed according to the workpiece being processed, for example;

[0030] (1) Soft: Polyurethane support sheet (suitable for workpieces that are easily scratched, such as aluminum tubes and plastic cylinders);

[0031] (2) Medium quality: Aluminum support plate (suitable for medium rigidity workpieces, balancing protection and support force);

[0032] (3) Rigid: Metal support plate (suitable for high rigidity workpieces, such as thick-walled steel pipes, to ensure support strength).

[0033] The five sets of 120mm circular arc support plates are of equal length, which makes the workpiece more evenly stressed when supported, effectively ensuring machining accuracy such as coaxiality and roundness, and improving product quality.

[0034] A bearing can be installed at the center of the end plate 160. When it is abutted by the tailstock of the machine tool, it can make the central shaft 110 and the arc support plate 120 on the outer wall rotate smoothly. Alternatively, it can be connected to other auxiliary tools on the machine tool to make the workpiece sleeved on the outside of the fixture body 100 rotate stably.

[0035] The central shaft 110 can be connected to the output shaft of the CNC machine tool, so that it can drive the fixture body 100 to rotate. When the cylindrical workpiece to be processed is sleeved on the outside of the five sets of arc support plates 120, the CNC machine tool conveys and pushes the central shaft 110 to move along its axial direction. At this time, the X-shaped support arm 130 drills a hole around the flat center point, driving the five sets of arc support plates 120 to expand outward along the radial direction of the central shaft 110 until the curved surface of the five sets of arc support plates 120 abuts against the inner wall of the cylindrical tool to complete the fixing function. It rotates with the machine tool to perform processing.

[0036] When the arc-shaped support plate 120 expands radially outward, each set of arc-shaped support plates 120 drives the arc-shaped outer frame 220 to move synchronously, as shown in the instruction manual. Figure 4 As shown, both ends of the two adjacent sets of arc-shaped outer frames 220 are provided with inner clearance grooves 240 and outer clearance grooves 250. When not unfolded, the two adjacent sets of arc-shaped outer frames 220 are in an interlaced state. Together with the inner liner ring 210, they seal the end face of the fixture body 100, preventing debris generated from cutting cylindrical workpieces from entering the arc support plate 120 and affecting the rotation of the X-shaped support arm 130. When unfolded, the two adjacent sets of arc-shaped outer frames 220 are opened, and the inner clearance grooves 240 and outer clearance grooves 250 slide. Together with the inner liner ring 210, they still serve the purpose of protection, making the fixture body 100 work smoothly and reducing the situation where it cannot be used due to debris, thereby indirectly improving the efficiency of workpiece processing.

[0037] Please refer to this carefully. Figure 1 The central shaft 110 includes a drive shaft 111 and a positioning shaft 112, with space reserved on the end faces of the drive shaft 111 and the positioning shaft 112 so that they can be relatively close to each other.

[0038] When the arc support plate 120 is replaced, the arc-shaped outer frame 220 connected to the end face can be replaced simultaneously to meet the purpose of clamping workpieces with smaller inner diameters. The drive shaft 111 and the positioning shaft 112 can be brought close to each other to meet the requirements of clamping workpieces.

[0039] Please refer to this carefully. Figure 2 and Figure 3The two sets of second bases 150 and first bases 140 are respectively fixed to the outer walls of the drive shaft 111 and the positioning shaft 112 with bolts, and the arc support plate 120 is fixedly connected to the two sets of first bases 140 with bolts.

[0040] Long straight grooves 151 are provided at the positions where the five sets of second bases 150 on the outer wall of the drive shaft 111 contact the X-shaped support arm 130. Long grooves corresponding to the long straight grooves 151 are also provided in the first base 140 at the position corresponding to the second bases 150 on the inner wall of the arc support plate 120.

[0041] When the arc support plate 120 is worn or needs to be replaced with a different material, simply remove the connecting bolts, replace them with the arc support plate 120 and tighten them again. The operation is simple.

[0042] Meanwhile, the opening of the long straight groove 151 and the long groove allows one end of the X-shaped support arm 130 to not only rotate around the second base 150 and the first base 140, but also to slide slightly, satisfying the condition of radial outward expansion of the arc support plate 120.

[0043] In use, the central shaft 110 is connected to the output shaft of the CNC machine tool, so that it can drive the main body 100 of the fixture to rotate. When the cylindrical workpiece to be processed is sleeved on the outside of the five sets of arc support plates 120, the CNC machine tool conveys and pushes the central shaft 110 to move along its axial direction. At this time, the X-shaped support arm 130 drills a hole around the flat center point, driving the five sets of arc support plates 120 to expand outward along the radial direction of the central shaft 110 until the curved surface of the five sets of arc support plates 120 abuts against the inner wall of the cylindrical tool to complete the fixing function. It rotates with the machine tool to perform processing.

[0044] When the arc-shaped support plate 120 expands radially outward, each set of arc-shaped support plates 120 drives the arc-shaped outer frame 220 to move synchronously, as shown in the instruction manual. Figure 4 As shown, both ends of the two adjacent sets of arc-shaped outer frames 220 are provided with inner clearance grooves 240 and outer clearance grooves 250. When not unfolded, the two adjacent sets of arc-shaped outer frames 220 are in an interlaced state. Together with the inner liner ring 210, they seal the end face of the fixture body 100, preventing debris generated from cutting cylindrical workpieces from entering the arc support plate 120 and affecting the rotation of the X-shaped support arm 130. When unfolded, the two adjacent sets of arc-shaped outer frames 220 are opened, and the inner clearance grooves 240 and outer clearance grooves 250 slide. Together with the inner liner ring 210, they still serve the purpose of protection, making the fixture body 100 work smoothly and reducing the situation where it cannot be used due to debris, thereby indirectly improving the efficiency of workpiece processing.

[0045] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A flexible internal bolster tooling for machining a tubular workpiece comprising a clamp body (100) characterised in that: The fixture body (100) includes a central shaft (110) arranged laterally and capable of being connected to the machine tool conveyor shaft. Five sets of arc support plates (120) are equidistantly arranged on the outer side of the central shaft (110) along its circumferential direction. Each set of arc support plates (120) has an X-shaped support arm (130) rotatably mounted on the outer wall of the central shaft (110) on its inner curved surface. The inner wall of the arc support plate (120) is fixed with a first base (140) connected to the end of the X-shaped support arm (130). The outer wall of the fixture body (100) is provided with a second base (150) connected to the other end of the X-shaped support arm (130). The end of the fixture body (100) away from the machine tool is provided with an end plate (160) that can be fixed to the tailstock of the machine tool.

2. A flexible internal bolster tooling for processing a tubular workpiece according to claim 1, wherein: The outer wall of the end plate (160) is fixed with a protective component (200) that can prevent debris from entering. The protective component (200) includes an inner liner ring (210) fixed to the outer wall of the end plate (160). The outer wall of the inner liner ring (210) is fitted with five sets of staggered arc-shaped outer frames (220). Each set of arc-shaped outer frames (220) is fixedly connected to the inner wall of the arc support plate (120). Each set of arc-shaped outer frames (220) has an outer clearance groove (250) and an inner clearance groove (240) at both ends.

3. A flexible internal bolster tooling for processing a cylindrical workpiece as defined in claim 2, wherein: The protective component (200) also includes a constraint groove (230) opened on the end face of the inner lining ring (210). The number of constraint grooves (230) corresponds to the number of arc-shaped outer frame (220). A constraint post that slides in the constraint groove (230) is fixed in the arc-shaped outer frame (220).

4. The flexible internal bolster tooling for processing cylindrical workpieces of claim 1, wherein: The central shaft (110) includes a drive shaft (111) and a positioning shaft (112), and the end faces of the drive shaft (111) and the positioning shaft (112) are reserved with space that allows them to be relatively close to each other.

5. A flexible internal bolster tooling for processing a tubular workpiece as defined in claim 1, wherein: The two sets of second bases (150) and first bases (140) are respectively fixed to the outer walls of the drive shaft (111) and the positioning shaft (112) by bolts, and the arc support plate (120) is fixedly connected to the two sets of first bases (140) by bolts.

6. A flexible internal bolster tooling for processing a cylindrical workpiece as defined in claim 5, wherein: Long straight grooves (151) are provided at the positions where the five sets of second bases (150) on the outer wall of the drive shaft (111) contact the X-shaped support arm (130). Long grooves corresponding to the long straight grooves (151) are also provided in the first base (140) at the position corresponding to the second bases (150) on the inner wall of the arc support plate (120).

Images